Patent Application
20250237218
As used herein, the term “molten metal” means any metal or combination of metals in liquid form, such as aluminum, copper, iron, zinc, and alloys thereof. The term “gas” means any gas or combination of gases, including argon, nitrogen, chlorine, fluorine, Freon, and helium, which are released into molten metal.
Known molten-metal pumps include a pump base (also called a housing or casing), one or more inlets (an inlet being an opening in the housing to allow molten metal to enter a pump chamber), a pump chamber of any suitable configuration, which is an open area formed within the housing, and a discharge, which is a channel or conduit of any structure or type communicating with the pump chamber (in an axial pump the chamber and discharge may be the same structure or different areas of the same structure) leading from the pump chamber to an outlet, which is an opening formed in the exterior of the housing through which molten metal exits the casing. An impeller, also called a rotor, is mounted in the pump chamber, and is connected to a drive device. The drive shaft is typically an impeller shaft connected to one end of a motor shaft; the other end of the drive shaft being connected to an impeller. Often, the impeller (or rotor) shaft is comprised of graphite and/or ceramic, the motor shaft is comprised of steel, and the two are connected by a coupling. As the motor turns the drive shaft, the drive shaft turns the impeller and the impeller pushes molten metal out of the pump chamber, through the discharge, out of the outlet and into the molten metal bath. Most molten metal pumps are gravity fed, wherein gravity forces molten metal through the inlet and into the pump chamber as the impeller pushes molten metal out of the pump chamber. Other molten metal pumps do not include a base or support posts and are sized to fit into a structure by which molten metal is pumped. Most pumps have a metal platform, or super structure, that is cither supported by a plurality of support posts attached to the pump base, or unsupported if there is no base. The motor is positioned on the superstructure if a superstructure is used.
This application incorporates by reference the portions of the following documents that are not inconsistent with this disclosure: U.S. Pat. No. 4,598,899, issued Jul. 8, 1986, to Paul V. Cooper, U.S. Pat. No. 5,203,681, issued Apr. 20, 1993, to Paul V. Cooper, U.S. Pat. No. 5,308,045, issued May 3, 1994, to Paul V. Cooper, U.S. Pat. No. 5,662,725, issued Sep. 2, 1997, to Paul V. Cooper, U.S. Pat. No. 5,678,807, issued Oct. 21, 1997, to Paul V. Cooper, U.S. Pat. No. 6,027,685, issued Feb. 22, 2000, to Paul V. Cooper, U.S. Pat. No. 6,124,523, issued Sep. 26, 2000, to Paul V. Cooper, U.S. Pat. No. 6,303,074, issued Oct. 16, 2001, to Paul V. Cooper, U.S. Pat. No. 6,689,310, issued Feb. 10, 2004, to Paul V. Cooper, U.S. Pat. No. 6,723,276, issued Apr. 20, 2004, to Paul V. Cooper, U.S. Pat. No. 7,402,276, issued Jul. 22, 2008, to Paul V. Cooper, U.S. Pat. No. 7,470,392, issued Dec. 30, 2008, to Paul V. Cooper, U.S. Pat. No. 7,507,367, issued Mar. 24, 2009, to Paul V. Cooper, U.S. Pat. No. 7,906,068, issued Mar. 15, 2011, to Paul V. Cooper, U.S. Pat. No. 8,075,837, issued Dec. 13, 2011, to Paul V. Cooper, U.S. Pat. No. 8,110,141, issued Feb. 7, 2012, to Paul V. Cooper, U.S. Pat. No. 8,178,037, issued May 15, 2012, to Paul V. Cooper, U.S. Pat. No. 8,337,746, issued Dec. 25, 2012, to Paul V. Cooper, U.S. Pat. No. 8,361,379, issued Jan. 29, 2013, to Paul V. Cooper, U.S. Pat. No. 8,366,993, issued Feb. 5, 2013, to Paul V. Cooper, U.S. Pat. No. 8,409,495, issued Apr. 2, 2013, to Paul V. Cooper, U.S. Pat. No. 8,440,135, issued May 15, 2013, to Paul V. Cooper, U.S. Pat. No. 8,444,911, issued May 21, 2013, to Paul V. Cooper, U.S. Pat. No. 8,449,814, issued May 28, 2013, to Paul V. Cooper, U.S. Pat. No. 8,475,708, issued Jul. 2, 2013, to Paul V. Cooper, U.S. Pat. No. 8,501,084, issued Aug. 6, 2013, to Paul V. Cooper, U.S. patent application Ser. No. 12/895,796, filed Sep. 30, 2010, to Paul V. Cooper, U.S. patent application Ser. No. 13/791,952, filed Mar. 9, 2013, to Paul V. Cooper, U.S. Pat. No. 8,529,828, issued Sep. 10, 2013, to Paul V. Cooper, U.S. Pat. No. 8,535,603 issued Sep. 17, 2013, to Paul V. Cooper, U.S. Pat. No. 8,613,884, issued Dec. 24, 2013 to Paul V. Cooper, U.S. Pat. No. 8,714,914, issued May 6, 2014 to Paul V. Cooper, U.S. Pat. No. 8,753,563, issued Jun. 17, 2014, to Paul V. Cooper, U.S. Pat. No. 9,011,761, issued Apr. 21, 2015, to Paul V. Cooper, U.S. Pat. No. 9,017,597, issued Apr. 28, 2015, to Paul V. Cooper, U.S. Pat. No. 9,034,244, issued May 19, 2015, to Paul V. Cooper, U.S. Pat. No. 9,080,577, issued Jul. 14, 2015, to Paul V. Cooper, U.S. Pat. No. 9,108,244, issued Aug. 18, 2015, to Paul V. Cooper, U.S. Pat. No. 9,156,087, issued Oct. 13, 2015, to Paul V. Cooper, U.S. Pat. No. 9,205,490, issued Dec. 8, 2015, to Paul V. Cooper, U.S. Pat. No. 9,328,615, issued May 3, 2016 to Paul V. Cooper, U.S. Pat. No. 9,377,028, issued Jun. 28, 2016, to Paul V. Cooper, U.S. Pat. No. 9,382,599, issued Jul. 5, 2016, to Paul V. Cooper, U.S. Pat. No. 9,383,140, issued Jul. 5, 2016, to Paul V. Cooper, U.S. Pat. No. 9,409,232, issued Aug. 9, 2016, to Paul V. Cooper, U.S. Pat. No. 9,410,744, issued Aug. 9, 2016, to Paul V. Cooper, U.S. Pat. No. 9,422,942, issued Aug. 23, 2016, to Paul V. Cooper, U.S. Pat. No. 9,435,343, issued Sep. 6, 2016, to Paul V. Cooper, U.S. Pat. No. 9,464,636, issued Oct. 11, 2016, to Paul V. Cooper, U.S. Pat. No. 9,470,239, issued Oct. 18, 2016, to Paul V. Cooper, 9,481,035, issued Nov. 1, 2016, to Paul V. Cooper, U.S. Pat. No. 9,482,469, issued Nov. 1, 2016, to Paul V. Cooper, U.S. Pat. No. 9,506,129, issued Nov. 29, 2016, to Paul V. Cooper, U.S. Pat. No. 9,566,645, issued Feb. 14, 2017, to Paul V. Cooper, U.S. Pat. No. 9,581,388, issued Feb. 28, 2017, to Paul V. Cooper, U.S. Pat. No. 9,587,883, issued Mar. 7, 2017, to Paul V. Cooper, U.S. Pat. No. 9,643,247, issued May 9, 2017, to Paul V. Cooper, U.S. Pat. No. 9,657,578, issued May 23, 2017, to Paul V. Cooper, U.S. Pat. No. 9,855,600, issued Jan. 2, 2018, to Paul V. Cooper, U.S. Pat. No. 9,862,026, issued Jan. 9, 2018, to Paul V. Cooper, U.S. Pat. No. 9,903,383, issued Feb. 27, 2018, to Paul V. Cooper, U.S. Pat. No. 9,909,808, issued Mar. 6, 2018, to Paul V. Cooper, U.S. Pat. No. 9,925,587, issued Mar. 27, 2018, to Paul V. Cooper, entitled U.S. Pat. No. 9,982,945, issued May 29, 2018, to Paul V. Cooper, U.S. Pat. No. 10,052,688, issued Aug. 21, 2018, to Paul V. Cooper, U.S. Pat. No. 10,072,891, issued Sep. 11, 2018, to Paul V. Cooper, U.S. Pat. No. 10,126,058, issued Nov. 13, 2018, to Paul V. Cooper, U.S. Pat. No. 10,126,059, issued Nov. 13, 2018, to Paul V. Cooper, U.S. Pat. No. 10,138,892, issued Nov. 27, 2018, to Paul V. Cooper, U.S. Pat. No. 10,195,664, issued Feb. 5, 2019, to Paul V. Cooper, U.S. Pat. No. 10,267,314, issued Apr. 23, 2019, to Paul V. Cooper, U.S. Pat. No. 10,274,256, issued Apr. 30, 2019, to Paul V. Cooper, U.S. Pat. No. 10,302,361, issued May 28, 2019, to Paul V. Cooper, U.S. Pat. No. 10,309,725, issued Jun. 4, 2019, to Paul V. Cooper, U.S. Pat. No. 10,307,821, issued Jun. 4, 2019, to Paul V. Cooper, U.S. Pat. No. 10,322,451, issued Jun. 18, 2019, to Paul V. Cooper, U.S. Pat. No. 10,345,045, issued Jul. 9, 2019, to Paul V. Cooper, U.S. Pat. No. 10,352,620, issued Jul. 16, 2019, to Paul V. Cooper, U.S. Pat. No. 10,428,821, issued Oct. 1, 2019, to Paul V. Cooper, U.S. Pat. No. 10,458,708, issued Oct. 29, 2019, to Paul V. Cooper, U.S. Pat. No. 10,465,688, issued Nov. 5, 2019, to Paul V. Cooper, U.S. Pat. No. 10,562,097, issued Feb. 18, 2020, to Paul V. Cooper, U.S. Pat. No. 10,570,745, issued Feb. 25, 2020, to Paul V. Cooper, U.S. Pat. No. 10,641,279, issued May 5, 2020, to Paul V. Cooper, U.S. Pat. No. 10,641,270, issued May 5, 2020, to Paul V. Cooper, U.S. Pat. No. 10,675,679, issued Jun. 9, 2020, to Paul V. Cooper, U.S. Pat. No. 10,947,980, issued May 16, 2021, to Paul V. Cooper, U.S. Pat. No. 11,020,798, issued Jun. 1, 2021, to Paul V. Cooper, U.S. Pat. No. 11,098,719, issued Aug. 24, 2021, to Paul V. Cooper, U.S. Pat. No. 11,098,720, issued Aug. 24, 2021, to Paul V. Cooper, U.S. Pat. No. 11,103,920, issued Aug. 31, 2021, to Paul V. Cooper, U.S. Pat. No. 11,130,173, issued Sep. 28, 2021, to Paul V. Cooper, U.S. Pat. No. 11,149,747, issued Oct. 19, 2021, to Paul V. Cooper, U.S. Pat. No. 11,167,345, issued Nov. 9, 2021, to Paul V. Cooper, U.S. Pat. No. 11,185,916, issued Nov. 30, 2021, to Paul V. Cooper, U.S. Pat. No. 11,286,939, issued Mar. 29, 2022, to Paul V. Cooper, U.S. Pat. No. 11,391,293, issued Jul. 19, 2022, to Paul V. Cooper, U.S. Pat. No. 11,471,938, issued Oct. 18, 2022, to Paul V. Cooper, U.S. Pat. No. 11,358,216, issued Jun. 14, 2022, to Paul V. Cooper, U.S. Pat. No. 11,358,217, issued Jun. 14, 2022, to Paul V. Cooper, U.S. Pat. No. 11,519,414, issued Dec. 6, 2022, to Paul V. Cooper, U.S. Pat. No. 11,759,854, issued Sep. 19, 2023, to Paul V. Cooper, U.S. Pat. No. 11,759,853, issued Sep. 19, 2023, to Paul V. Cooper, U.S. patent application Ser. No. 16/413,142, filed May 15, 2019, by Paul V. Cooper, U.S. patent application Ser. No. 16/533,383, filed Aug. 6, 2019, by Paul V. Cooper, U.S. patent application Ser. No. 16/533,404, filed Aug. 6, 2019, by Paul V. Cooper, U.S. patent application Ser. No. 16/877,267, filed May 18, 2020, by Paul V. Cooper, U.S. patent application Ser. No. 16/877,364, filed May 18, 2020, by Paul V. Cooper, U.S. patent application Ser. No. 17/200,785, filed Mar. 13, 2021, by Paul V. Cooper, U.S. patent application Ser. No. 17/334,259, filed May 28, 2021, by Paul V. Cooper, U.S. patent application Ser. No. 17/496,229, filed Oct. 7, 2021, by Paul V. Cooper, U.S. patent application Ser. No. 17/703,912, filed Mar. 24, 2022, by Paul V. Cooper, U.S. patent application Ser. No. 17/719,274, filed Apr. 12, 2022, by Paul V. Cooper, U.S. patent application Ser. No. 17/826,111, filed May 26, 2022, by Paul V. Cooper, U.S. patent application Ser. No. 17/939,898 filed Sep. 7, 2022, by Vince Fontana, U.S. patent application Ser. No. 18/114,665, filed Feb. 27, 2023, by Paul V. Cooper, U.S. patent application Ser. No. 18/139,936, filed Apr. 26, 2023, by Paul V. Cooper, U.S. patent application Ser. No. 18/480,755, filed Oct. 4, 2023, by Vince Fontana, U.S. patent application Ser. No. 18/502,457, filed Nov. 6, 2023, by Paul V. Cooper.
Three basic types of pumps for pumping molten metal, such as molten aluminum, are utilized: circulation pumps, transfer pumps and gas-release pumps. Circulation pumps are used to circulate the molten metal within a bath, thereby generally equalizing the temperature of the molten metal. Circulation pumps may be used in any vessel, such as in a reverbatory furnace having an external well. The well is usually an extension of the charging well, in which scrap metal is charged (i.e., added).
Standard transfer pumps are generally used to transfer molten metal from one structure to another structure such as a ladle or another furnace. A standard transfer pump has a riser tube connected to a pump discharge and supported by the superstructure. As molten metal is pumped it is pushed up the riser tube (sometimes called a metal-transfer conduit) and out of the riser tube, which generally has an elbow at its upper end, so molten metal is released into a different vessel from which the pump is positioned.
Gas-release pumps, such as gas-injection pumps, circulate molten metal while introducing a gas into the molten metal. In the purification of molten metals, particularly aluminum, it is frequently desired to remove dissolved gases such as hydrogen, or dissolved metals, such as magnesium. As is known by those skilled in the art, the removing of dissolved gas is known as “degassing” while the removal of magnesium is known as “demagging.” Gas-release pumps may be used for either of both of these purposes or for any other application for which it is desirable to introduce gas into molten metal.
Gas-release pumps generally include a gas-transfer conduit having a first end that is connected to a gas source and a second end submerged in the molten metal bath. Gas is introduced into the first end and is released from the second end into the molten metal. The gas may be released downstream of the pump chamber into either the pump discharge or a metal-transfer conduit extending from the discharge, or into a stream of molten metal exiting either the discharge or the metal-transfer conduit. Alternatively, gas may be released into the pump chamber or upstream of the pump chamber at a position where molten metal enters the pump chamber. The gas may also be released into any suitable location in a molten metal bath.
Molten metal pump casings and rotors often employ a bearing device comprising ceramic rings wherein there are one or more rings on the rotor that align with rings in the pump chamber (such as rings at the inlet and outlet) when the rotor is placed in the pump chamber. The purpose of the bearing device is to reduce damage to the soft, graphite components, particularly the rotor and pump base, during pump operation.
Generally, a degasser (also called a rotary degasser) for molten metal, such as molten aluminum, includes (1) an impeller shaft having a first end, a second end and a passage for transferring gas, (2) an impeller, and (3) a drive source for rotating the impeller shaft and the impeller. The first end of the impeller shaft is connected to the drive source and to a gas source and the second end is connected to the impeller.
Generally, a scrap melter for molten metal (particularly molten aluminum) includes an impeller affixed to an end of a drive shaft, and a drive source attached to the other end of the drive shaft for rotating the shaft and the impeller. The movement of the impeller draws molten metal and scrap metal downward into the molten metal bath in order to melt the scrap. A circulation pump is often used in conjunction with the scrap melter to circulate the molten metal in order to maintain a relatively constant temperature within the molten metal.
The materials forming the components that contact the molten metal bath should remain relatively stable in the bath. Structural refractory materials, such as graphite or ceramics, that are resistant to disintegration by corrosive attack from the molten metal may be used. As used herein “ceramics” or “ceramic” refers to any oxidized metal (including silicon, such as silicon dioxide) or carbon-based material, excluding graphite, or other ceramic material capable of being used in a molten metal. “Graphite” means any type of graphite, whether or not chemically treated. Graphite is suitable for being formed into pump components because it is (a) soft and relatively easy to machine, (b) not as brittle as ceramics and less prone to breakage, and (c) less expensive than ceramics. Ceramic, however, is more resistant to corrosion by molten aluminum than graphite. “refractory” refers to cost material, such as a high temperature cement (such as alumina-silica) or concrete.
Some devices or systems used to transfer molten metal include a molten metal pump and a molten metal-transfer conduit, or metal-transfer conduit. The molten metal pump may have a pump base with a pump chamber in which a rotor is positioned, and a discharge that extends from the pump chamber to a pump outlet formed in a side of the pump base. The metal-transfer conduit has a metal-transfer inlet (or transfer inlet) in fluid communication with the pump outlet. In prior devices there was often a gap between the pump outlet and the transfer inlet so more pump speed was required to raise the level of molten metal in the metal-transfer conduit. Alignment of the pump outlet with the transfer inlet of the metal-transfer conduit would be an advantage. The better the alignment, the less pressure required from the pump to push molten metal into the metal-transfer conduit, up the passage of the metal-transfer conduit, and out of the transfer outlet.
A molten metal pump has a pump base and a platform (also called a superstructure) above the pump base. The platform and pump base are connected by one or more support posts. There may be a plurality of support posts, such as three or four. Each of the one or more support posts has a body and a rod positioned at least partially in the body.
The body of each of the one or more support posts preferably comprises one or more of ceramic, such as silicon carbide, and graphite. In one embodiment each body of the one or more support posts has a top end (also called a first body end) end and a bottom end (also called a second body end). The body is comprised of graphite, ceramic, or graphite with a ceramic cover. Preferably, the body is comprised of graphite along about 15%-30% of its length as measured from the bottom end (which is the end juxtaposed the pump base when the pump is assembled), and is preferably comprised of ceramic or ceramic surrounding graphite from the top of the graphite portion to the top end of the body, which is the end juxtaposed the platform when the pump is assembled. Thus, the ceramic (or ceramic/graphite) portion of the body preferably comprises about 70%-85% of the length of the body.
A rod, which can be comprised of any suitable material but is preferably steel, is at least partially positioned in each of the one or more support posts and has one or both of (1) a first rod end extending from the first body end of the support post, and (2), a second rod end extending from the second body end of the support post. Therefore, there may only be a first rod end or a second rod end in each of the one or more support posts. In one embodiment, the rod in each of the one or more support posts extends entirely through the support post and has a first rod end extending from the first body end of the support post and a second rod end extending from the second body end of the support post.
If the support post has a rod with a first rod end extending from the first end of the support post, the first rod end is positioned in and through an aperture (or opening) of the platform when the pump is assembled and is attached to the platform by a fastener that connects to the first rod end on the top (or upper) surface of the platform. In one embodiment, the first rod end is threaded and is connected to the platform by a nut being threaded onto it on the top surface of the platform.
If the rod has a second rod end that extends from the second body end of the support post, the second rod end is positioned in a bore in the pump base where it is retained and connected to the pump base by any suitable fastener when the pump is assembled. The fastener is preferably positioned inside of the pump base. In one embodiment, the second rod end is threaded and is connected to the pump base by being threaded into a screw boss positioned in the pump base.
By connecting the first rod end to the platform, the top end of the support post need not be directly connected to the platform such as shown, for example, in U.S. Pat. No. 5,203,681. That type of connection requires a large hole to be formed in the platform so the support post end can fit through the large hole. An end cap with flanges, which is typically two pieces, is positioned around the end of the support post above the platform to connect the first body end to the platform. With the structure of this disclosure, the extra machining of the platform to create large holes, the costs of the end caps, and the assembly of the end caps onto the respective ends of the support posts, are eliminated.
By connecting the second rod end to the base, the bottom end of the support post need not be positioned inside of the pump base, nor extend through the pump base bottom, as shown, for example, in U.S. Pat. No. 5,203,681. That type of connection requires a relatively large aperture to be formed in the pump base, which weakens the pump base, to accept the bottom end of the support post. Additionally, bores are drilled from the outside surface of the pump base to the large apertures. After the bottom end of the support post is positioned in the aperture, cement is injected into the bores to at least partially surround the bottom end in the large aperture to secure the bottom end to the pump base. It then takes about 4-6 hours for the cement to dry at an elevated temperature, such as 400° F.-500° F. These steps and structures are eliminated by the structure disclosed herein.
With the structures of this disclosure the platform and pump base can be smaller because less room is required to attach them to the one or more support posts. This reduces material costs and enables the platform and pump base to be smaller, which means the assembled molten metal pump can fit into smaller spaces.
In the embodiment shown, a metal-transfer conduit is in communication with the pump, although the support posts, platform, and pump base of this disclosure can be used with any suitable molten metal pump, including those not in communication with a metal-transfer conduit or those in communication with or utilizing a different metal-transfer conduit. In this embodiment, as the pump pumps molten metal, the molten metal exits the outlet of the pump base, enters the inlet of the metal-transfer conduit, travels up a metal-transfer passage of the metal-transfer conduit, and exits the metal-transfer conduit outlet. A launder or pipe is preferably connected to the metal-transfer conduit outlet so molten metal exiting the metal- transfer conduit outlet enters such a structure and is transferred to where the operator desires.
As shown, the pump base includes an indentation in one side, wherein the indentation is configured to receive the lower portion of metal-transfer conduit, and a pump outlet in the indentation.
Turning now to the drawings, where the purpose is to describe an embodiment of the invention and not to limit the scope of the claims, a device 10 includes a pump 100 and a metal-transfer conduit 500. A pump, support post, platform, and pump base (with or without an indentation to receive a metal-transfer conduit) according to this disclosure may be used in any suitable application, including one without a metal-transfer conduit.
As seen, for example, in
The support posts 126 connect the superstructure 122 to the pump base 130. The components of pump 100 that are immersed in molten metal, such as the pump base 130, support posts 126, rotor 200, and rotor shaft 128B, are preferably comprised of heat resistant material, such as refractory, graphite and/or ceramic.
As best seen in
The rotor 200, best seen in
In operation, the motor 124 rotates the drive shaft 128, which rotates the rotor 200. As the rotor 200 rotates, it moves molten metal out of the pump chamber 134, through the discharge 136, and through the pump outlet 138.
The platform 122 is preferably comprised of steel and has a top (or upper) surface 122A and a bottom (or lower) surface (not shown). The platform 122 has openings 127 (best seen in
The body 121 of each of the one or more support posts 126 preferably comprises one or more of ceramic, such as silicon carbide, and graphite. In one embodiment each body 121 of the one or more support posts 126 has a top end (called a first body end) 126D and a bottom end (also called a second body end) 126E. The body 121 is preferably comprised of graphite along about 15%-30% of its length at 126B as measured from the bottom body end 126E (which is the end juxtaposed the pump base when the pump is assembled), and is preferably comprised of ceramic at portion 126A from the top of the graphite portion 126B of the body 121 to the top body end 126D of the body, which is the end juxtaposed the platform when the pump is assembled. Thus, the ceramic portion (or ceramic covering graphite) 126A of the body 121 preferably comprises about 70%-85% of the length of the body.
A rod 126C, which can be comprised of any suitable material but is preferably steel, is at least partially embedded in each of the one or more support posts 126 and has one or both of (1) a first rod end 126C1 extending from the first body end 126D of the support post 126, and (2) a second rod end 126C2 extending from the second body end 126E of the support post 126. Therefore, there may only be a first rod end 126C1 or a second rod end 126C2 in each of the one or more support posts 126. In one embodiment, the rod 126C in each of the one or more support posts 126 extends entirely through the support post body 121 and has a first rod end 126C1 extending from the first body end 126D of the support post 126 and a second rod end 126C2 extending from the second body end 126E of the support post 126.
If the support post 126 has a rod 126C with a first rod end 126C1 extending from the first body end 126D of the support post 126, the first rod end 126C1 is positioned in and through an aperture 127 of the platform 122 and is attached to the platform 122 by a fastener (such as nut 123) that connects to the first rod end 126C1 on the top (or upper) surface 122A of the platform 122. In one embodiment, the first rod end 126C1 is threaded and is connected to the platform by nut 123 being threaded onto it on the top side 122A of the platform 122.
If the rod 126C has a second rod end 126C2 that extends from the second body end 126E of the support post 126, the second rod end 126C2 is positioned in a bore 139A in the pump base 130 where it is retained and connected to the pump base 130 by any suitable fastener, which is preferably positioned inside the pump base 130. In one embodiment, the second rod end 126C2 is threaded and is connected to the pump base 130 by being threaded into a screw boss (not shown) positioned in the pump base 130.
The pump base 130, which is shown, for example, in
Top surface 137 includes recesses 139 and apertures 139A that lead to screw bosses or other fastening devices inside of pump base 130. The second rod end 126C2 of each support post 126 is received in an aperture 139A and is connected to a fastener inside of pump base 130. In this embodiment, each respective second rod end 126C2 is threaded and is threadingly attached to a screw boss in pump base 130. When second rod end 126C2 is threaded into the screw boss, the second body end 126E is positioned in recess 139, which helps isolate second rod end 126C1 and the fastener from molten metal. Additionally, a bead of cement may be placed around second body end 126E when it is in recess 139.
Pump chamber 134 is a cavity formed in the pump base 130. The pump chamber 134 is connected to a tangential discharge 136 (shown, for example, in
Side 140 has a first outer recess 140A and a second outer recess 140B. Two legs 140C and 140D are formed on either side of indentation 142. As shown, indentation 142 is formed in the center of legs 140C and 140D with pump outlet 138 formed in the center of indentation 142. Any suitable location for indentation 142 and pump outlet 138, however, may be utilized.
The indentation 142 is configured to receive metal-transfer conduit 500 and to align the pump outlet 138 with a transfer inlet 506, which is shown, for example, in
A metal-transfer conduit 500 is a structure configured to be positioned in indentation 142 of pump base 130 and may be connected to and entirely supported by pump 100. Metal-transfer conduit 500 as shown (and best seen in
Metal-transfer conduit 500 is preferably comprised of material capable of withstanding the heat and corrosive environment of molten metal (particularly molten aluminum). Most preferably the heat resistant material is a high temperature, castable cement, with a high silicon carbide content, such as ones manufactured by AP Green or Harbison Walker, each of which are part of ANH Refractory, based at 400 Fairway Drive, Moon Township, PA 15108, or Allied Materials. Cement (if used) to connect metal-transfer conduit 500 to pump base 130 is of a type know by those skilled in the art, and is cast in a conventional manner.
In the embodiment shown, the metal-transfer conduit 500 has a bottom portion 502 and a top portion 504. The bottom portion is preferably comprised of graphite because graphite is relatively inexpensive and simple to machine, which is helpful in obtaining dimensions sufficient for the bottom portion to be received in the indentation 142 and for the transfer inlet 506 to align with the pump outlet 138.
Metal-transfer conduit 500 as shown has four sides 500A, 500B, 500C and 500D, a bottom surface 500E a top surface 500F, a transfer inlet 506, a passage 508, and a transfer outlet 510. As best seen in
Transfer inlet 506 is formed in side 500C, preferably starting about 2″-6″, or 1½″-3″, from bottom surface 500E. Transfer inlet 506 can be of any suitable size and shape, and as shown has rounded sides 506A and 506B and a height of about 2″-4″ (or about 3.25″) and a width of about 4″-6″ (or about 5″). Transfer inlet 506 may have the same size and dimensions of pump outlet 138 or it may have a cross-sectional area that is smaller or larger than the cross-sectional area of pump outlet 138. For example, the transfer inlet 506 may have a cross-sectional area that is 5%-10%, 10%-20%, 20%-30%, 30%-40%, 40%-50%, or any amount from 5%-50% larger or smaller than the cross-sectional area of pump outlet 138. The cross-sectional area of the pump outlet 138 is measured at the outer surface of indentation 142, and the cross-sectional area of transfer inlet 506 is measured at the outer surface of side 502C.
Transfer inlet 506 functions to allow molten metal to pass through it and into passage 508. Transfer inlet 506 may be configured to receive an extension (not shown) of base 130 of pump 100, wherein the pump outlet 138 is formed at the end of the extension.
Metal-transfer conduit 500 has a transfer outlet 510 formed in its top surface 512. Transfer outlet 510 is of any suitable size and shape to permit molten metal to move through it.
Pump base 130 and metal-transfer conduit 500 may also have structural features such as ridges, projections, grooves, or bores to assist in aligning metal-transfer conduit 500 with indentation 142 and pump outlet 138 with transfer inlet 506.
When aligned, pump outlet 138 and transfer inlet 506 are about 0-3″ apart, or about 0-2″ apart, or about ¼″-2″ apart or 0-½″ apart. The pump outlet 138 and transfer inlet 506 are also preferably aligned vertically and horizontally so the respective centers of pump outlet and transfer inlet 506 are approximately aligned. By maintaining pump outlet 138 and transfer inlet 506 in close proximity, most molten metal from pump outlet 138 enters transfer inlet 506 when pump 100 is activated. Little pump speed or pressure is wasted, which helps the overall function of device 10.
Metal-transfer conduit 500 includes a groove 520 on side 502B and groove 522 on side 502B. Each groove terminates at side 502A and extends slightly (about ½″-1″) onto side 502C. The purpose of grooves 520 and 522 is to connect to clamp 600 as described herein.
Clamp 600 is preferably comprised of steel and has a top plate 602 that is configured to be positioned on top surface 500F of metal-transfer conduit 500 and be connected thereto by rods 720 and suitable fasteners, such as nuts. First plate 602 has an opening 602A that is configured to align with transfer outlet 510.
Arms 604 are connected to top plate 602 and are configured to be connected to platform 122 by being positioned on fasteners 150, each of which receives an aperture (not shown) in the bottom of each arm 604.
Side portions 612 each have ridges (not shown) that mate, respectively, with grooves 520 and 522 to secure clamp 600 to metal-transfer conduit 500.
In operation, when the motor 124 is activated, molten metal is pumped out of the pump outlet 138 through the transfer inlet 506, and into passage 508/708. Passage 508/708 fills with molten metal until the molten metal reaches the transfer outlet 510. Molten metal then exits transfer outlet 510. The transfer outlet 510 may be connected to a launder 1000, which has sides 1002, a first end 1004, a second end 1006, an inlet 1008, and a top 1010. Transfer outlet 510 is in communication with launder inlet 1008 and molten metal enters the launder at inlet 1008 and travels from first end 1004 to second end 1006. A pipe, launder or other structure that further transfers the molten metal may be attached to second end 1006.
Alternatively, a pipe 1100 with a first (or proximal) end 1102, a second (or distal) end, and a passage 1106 that extends from first end 1102 to second end 1104 may be utilized. The first end 1102 of pipe 1100 is connected to clamp 600 and is in fluid communication with outlet 510 of transfer-conduit 500. In operation, when the motor 124 is activated, molten metal is pumped out of the pump outlet 138 through the transfer inlet 506, and into passage 508/708. Passage 508/708 fills with molten metal until the molten metal reaches the transfer outlet 510. Molten metal then exits transfer outlet 510. The transfer outlet 510 may be connected to a pipe, launder or other structure that further transfers the molten metal
Some non-limiting examples of this disclosure are as follows:
Example 1: A molten metal pump comprising:
Example 2: The molten metal pump of claim 1 that further comprises a plurality of openings in the platform and each of the plurality of openings is configured to have one first rod end positioned therein and having a portion that extends therethrough and above the top surface of the platform, and a fastener is connected to each first rod end at the top surface of the platform.
Example 3: The molten metal pump of claim 2, wherein each first rod end is threaded and each fastener is a nut and threads onto the first rod end.
Example 4: The molten metal pump of claim 2 that does not include support post clamps.
Example 5: The molten metal pump of claim 1, wherein the rod has a second rod end that extends outward from the body second end and that connects to the pump base.
Example 6: The molten metal pump of claim 5, wherein the second rod end is threaded and is threadingly connected to the pump base.
Example 7: The molten metal pump of claim 6, wherein the pump base comprises a screw boss and the second rod end is threaded into the screw boss.
Example 8: The molten metal pump of claim 7, wherein the screw boss is inside of the pump base.
Example 9: The molten metal pump of claim 5, wherein the pump base has a top surface and a recess at the position of each rotor shaft and the second body end of each rotor shaft is positioned in the recess when the support post is connected to the pump base.
Example 10: The molten metal pump of claim 5 that does not use cement to connect any of the plurality of support posts to the pump base.
Example 11: The molten metal pump of claim 5, wherein the pump base does not include an aperture configured to receive the second body end of the support post.
Example 12: The molten metal pump of claim 11, wherein the pump base does not include one or more bores extending from the outside of the pump base to an aperture configured to receive a motor shaft.
Example 13: The molten metal pump of claim 1 that further comprises a one or more brackets configured to position it in a vessel configured to retain molten metal.
Example 14: The molten metal pump of claim 5 that further comprises a one or more brackets configured to position it in a vessel configured to retain molten metal.
Example 15: The molten metal pump of claim 14, wherein the one or more brackets are connected to the platform and to the vessel.
Example 16: The molten metal pump of claim 14 that further comprises a frame on the vessel and the one or more brackets are connected to the one or more brackets.
Example 17: The molten metal pump of claim 1 that is connected to a metal-transfer conduit, wherein the metal-transfer conduit includes an inlet in fluid communication with the pump outlet.
Example 18: The molten metal pump of claim 13, wherein the pump outlet is positioned against the metal-transfer conduit inlet.
Example 19: The molten metal pump of claim 10, wherein the metal-transfer conduit further includes an outlet above the metal-transfer conduit inlet.
Example 20: The molten metal pump of claim 13, wherein the metal-transfer conduit is connected to the frame.
Example 21: The molten metal pump of claim 17, wherein the metal-transfer conduit is connected to a launder that has a launder inlet and the outlet of the transfer conduit is in fluid communication with the launder inlet.
Example 22: The molten metal pump of claim 21, wherein the launder further comprises an outlet.
Example 23: The molten metal pump of claim 15, wherein the frame is welded to the vessel.
Example 24: The molten metal pump of claim 5, wherein the pump base has a small footprint.
Example 25: The molten metal pump of claim 1, wherein the platform has a small footprint.
Example 26: The molten metal pump of claim 1, wherein each of the body plurality of each of the plurality of support posts comprises ceramic sheath.
Example 27: The molten metal pump of claim 1, wherein the rod of each of the plurality of support posts extends through the center of the support post.
Example 28: The molten metal pump of claim 5, wherein the second rod end does not extend past a bottom surface of the pump base.
Example 29: The molten metal pump of claim 5 that does not include post clamps.
Example 30: The molten metal pump of claim 17, wherein the metal-transfer conduit has a top surface that is connected to a first end of a transfer pipe.
Example 31: The molten metal pump of claim 30, wherein the transfer pipe has an inlet in fluid communication with a metal-transfer conduit outlet.
Example 32: The molten metal pump of claim 26, wherein the transfer pipe has a second end that is positioned outside of the vessel.
Example 33: The molten metal pump of claim 30, wherein the transfer pipe is connected to the platform.
Example 34: A support post for use in a molten metal pump that comprises:
Example 35: The support post of claim 34, wherein the rod has a second rod end that extends from the second body end and is configured to connect to the pump base.
Example 36: A molten metal pump base that comprises an inlet leading to a pump chamber and an outlet in communication with the pump chamber, and that is configured to be used in a molten metal pump that comprises:
Example 37: The molten metal pump base of claim 36, wherein the second rod end is threaded and threads into the molten metal pump base.
Example 38: The molten metal pump base of claim 36, wherein no cement is injected into the base to retain the second rod end or the support post.
Some further non-limiting examples of this disclosure are as follows:
Example 1: A device for transferring molten metal, the device comprising:
Example 2: The device of example 1, wherein the pump outlet is in the center of the indentation.
Example 3: The device of example 1 or 2, wherein the pump further includes a platform that supports a motor.
Example 4: The device of example 3, wherein the platform is attached to a clamp and the clamp is further attached to the top portion of the metal-transfer conduit.
Example 5: The device of any of examples 1-4, wherein the bottom portion of the metal-transfer conduit is comprised of graphite and the top portion of the transfer conduit is comprised of ceramic.
Example 6: The device of example 5, wherein the ceramic is silicon carbide.
Example 7: The device of example 5 or 6, wherein the bottom portion consists of graphite.
Example 8: The device of any of examples 5 or 6, wherein the top portion consists of ceramic.
Example 9: The device of any of examples 1-8, wherein the discharge is tangential to the pump chamber.
Example 10: The device of any of examples 1-10, wherein the transfer outlet is on a top surface of the transfer conduit.
Example 11: The device of any of examples 1-11, wherein the pump outlet has an outer cross-sectional area and the transfer inlet has an outer cross-sectional area.
Example 12: The device of example 11, wherein the cross-sectional area of the pump outlet is the same as the cross-sectional area of the transfer inlet.
Example 13: The device of example 11, wherein the cross-sectional area of the pump outlet is greater than the cross-sectional area of the transfer inlet.
Example 14: The device of example 11, wherein the cross-sectional area of the transfer inlet is greater than the cross-sectional area of the pump outlet.
Example 15: The device of any of examples 1-14, wherein the metal-transfer conduit is connected to the pump base.
Example 16: The device of example 15, wherein the metal-transfer conduit is cemented to the pump base.
Example 17: The device of any of examples 1-16, wherein a distance between the pump outlet and the transfer inlet is 2″ or less.
Example 18: The device of any of examples 1-16, wherein a distance between the pump outlet and the transfer inlet is ½″ or less.
Example 19: The device of any of examples 1-18, wherein the side of the pump base that includes the indentation has a first chamfered side and a second chamfered side.
Example 20: The device of example 19, wherein the first chamfered side and the second chamfered side are chamfered inwards by 5° to 20°.
Example 21: The device of any of examples 1-20, wherein the indentation has a depth of 1″ to 4″.
Example 22: The device of any of examples 1-21, wherein the indentation has a length of 8″ to 14″.
Example 23: The device of any of examples 1-22, wherein the indentation has a first, inner wall and a second, inner wall.
Example 24: The device of example 23, wherein the first, inner wall is angled inwards by 5° to 20° and the second, inner wall is angled inwards by 5° to 20°.
Example 25: The device of any of examples 1-24, wherein the pump outlet and the transfer inlet are vertically aligned.
Example 26: The device of any of examples 1-25, wherein the pump outlet and the transfer inlet are horizontally aligned.
Example 27: The device of any of examples 1-26, wherein the pump base further includes one or more locater structures configured to align the pump base with the metal-transfer conduit.
Example 28: The device of example 27, wherein the one or more locater structures are in the indentation.
Example 29: The device of any of examples 1-28, wherein the metal-transfer conduit has one or more locater structures configured to align the metal-transfer conduit with the pump base.
Example 30: The device of any of examples 1-29, wherein the metal-transfer conduit has a front surface having a first width, a second surface on which the transfer inlet is positioned, wherein the second surface has a second width, and the second width is less than the first width.
Example 31: The device of example 30, wherein the metal-transfer conduit has a two side surfaces that connect the first surface to the second surface, wherein each of the side surfaces are angled.
Example 32: The device of example 4, wherein the clamp has a first plate attached to a top surface of the metal transfer conduit and a second plate attached to the platform.
Example 33: The device of example 32, wherein the clamp further includes an opening in the first plate and the opening is aligned with the transfer outlet.
Example 34: The device of example 32 or 33, wherein the clamp further includes a step-up section that connects the first plate to the second plate.
Example 35: The device of example 34, wherein the step-up section is connected to a side of the platform.
Example 36: The device of any of examples 32-35, wherein the first plate and second plate are connected by hinges and the clamp is movable between a first, compressed position and a second, expanded position.
Example 37: The device of any of examples 4 or 32-36, wherein the metal transfer conduit has grooves in two sides and the clamp has side plates with ridges received in the grooves.
Some additional, non-limiting examples of this disclosure are as follows:
Example 1: A pump base for a molten metal pump, the pump base comprising:
Example 2: The device of example 1, wherein the outlet is in the center of the indentation.
Example 3: The device of example 1 or 2, wherein the pump further includes a platform that supports a motor.
Example 4: The device of example 3, wherein the platform is configured to attach to the top portion of the transfer conduit.
Example 5: The device of any of examples 1-4, wherein the discharge is tangential to the pump chamber.
Example 6: The device of any of examples 1-11, wherein the pump outlet has an outer cross-sectional area and the transfer inlet has an outer cross-sectional area.
Example 7: The device of any of examples 1-18, wherein the front side of the pump base has a first chamfered side and a second chamfered side.
Example 8: The device of example 19, wherein the first chamfered side and the second chamfered side are chamfered inwards by 5° to 20°.
Example 9: The device of any of examples 1-20, wherein the indentation has a depth of 1″ to 4″.
Example 10: The device of any of examples 1-21, wherein the indentation has a length of 8″ to 14″.
Example 11: The device of any of examples 1-22, wherein the indentation has a first, inner wall and a second, inner wall.
Example 12: The device of example 23, wherein the first, inner wall is angled inwards by 5° to 20° and the second, inner wall is angled inwards by 5° to 20°.
Some additional, non-limiting examples of this disclosure are as follows:
Example 1: A transfer conduit for use with a molten metal pump, the transfer conduit comprising: a top portion and a bottom portion, a transfer inlet, a transfer outlet, and a passage extending from the transfer inlet to the transfer outlet, wherein the bottom portion of the transfer conduit is positioned in the indentation and the transfer inlet is juxtaposed and in fluid communication with the outlet.
Example 2: The device of example 1, wherein the bottom portion of the transfer conduit is comprised of graphite and the top portion of the transfer conduit is comprised of ceramic.
Example 3: The device of example 2, wherein the ceramic is silicon carbide.
Example 4: The device of example 2 or 3, wherein the bottom portion consists of graphite.
Example 5: The device of any of examples 2 or 3, wherein the top portion consists of ceramic.
Example 6: The device of any of examples 1-5, wherein the transfer outlet is in a top surface of the transfer conduit.
Having thus described some embodiments of the invention, other variations and embodiments that do not depart from the spirit of the invention will become apparent to those skilled in the art. The scope of the present invention is thus not limited to any particular embodiment, but is instead set forth in the appended claims and the legal equivalents thereof. Unless expressly stated in the written description or claims, the steps of any method recited in the claims may be performed in any order capable of yielding the desired result.
This application claims priority to U.S. Provisional Ser. No. 63/622,267 filed on Jan. 18, 2024 entitled “Molten Metal Transfer Device,” the contents of which are incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 63622267 | Jan 2024 | US |
