This invention relates to a lubrication system for use in a pump or the like. More particularly, this invention relates to an oil misting system for a centrifugal chemical processing pump including an external reservoir provided for the purpose of reducing maintenance requirements, and maintaining clean and temperature efficient lubricating fluid in the pump misting chamber.
Environmentally hazardous fluids, such as acids, oils, and toxins, which can cause serious harm to the environment often need to be pumped throughout fluid flow systems from one location to another. Centrifugal pumps including a motor driven impeller affixed to a pump shaft are typically utilized in, pumping such fluids. The shafts of such pumps are typically rotatably supported against radial movement and vibration by conventional pump shaft bearings (e.g. ball bearings). These bearings must be continually lubricated throughout the operation of the pump in order to reduce maintenance requirements and maintaining a satisfactory operating life of the bearings and thus the pump.
Conventional lubricating fluids, such as oils, are typically used to lubricate such pump shaft bearings. See, for example, commonly owned U.S. Pat. No. 5,340,273, the disclosure of which is hereby incorporated herein by reference. The lubricating fluid is generally housed in a bearing lubrication or misting chamber surrounding the pump shaft. Conventional pumps typically include ball bearings, as disclosed in the '273 patent, located within or adjacent the misting or lubricating chamber, for supporting the pump shaft. In the prior art, these shaft supporting bearings are often lubricated by positioning the lubricant level within the lubrication chamber at a level or position about half-way up the bottom bearing ball. Maintaining the lubricating oil level at such a position necessarily translates into the bearing balls plowing through the lubricating fluid (e.g. oil) when the shaft and supporting bearings are rotated. This results in undesirable heat generation within the bearings and adjacent the pump shaft, such heat generation being caused by the friction created by the bearing balls continually passing through the lubricating oil. Such heat generation increases maintenance requirements and reduces the operating life of the bearings.
Dirt, contaminants, and moisture in the lubricant is also a problem. The presence of such contaminants in the lubricating fluid results in increased wear and greatly reduced life of the bearings and thus additional maintenance.
In the prior art, when it is time to “change the oil” in such pumps, it is necessary to shut down the pump, remove an oil plug typically located at the bottom of the misting chamber, drain the oil, close the plug, and thereafter fill the chamber with clean oil from the top. Unfortunately, this results in substantial downtime of the pump, undesirable labor requirements, and strong reliance upon operators in the field for inserting/removing the proper amount and type of lubricating fluid. Also, an undesirably large amount of oil is used over time.
It is apparent from the above that there exists a need in the art for a lubrication system wherein: (i) the system is easily retrofitable to all pumps and similar equipment with a simple and easy to use installation kit; (ii) the lubricating fluid in the system is maintained in a clean and moisture free state without requiring frequent “oil changes”; (iii) the temperature of the lubricating fluid in the misting chamber is maintained at the lowest possible level so as to increase the life of the mechanical components therein; (iv) the system permits an operator to visually check the oil level and visual appearance of the oil in the pump without having to shut it down; and (v) a larger capacity lubricant reservoir is provided.
It is the purpose of this invention to fulfill the above-described needs in the art as well as other needs apparent to the skilled artisan from the following detailed description of this invention.
Generally speaking, this invention fulfills the above-described needs in the art by providing a universal, easy to install circulating lubrication system retrofit kit for lubricating shaft supporting bearings which rotatingly support a shaft, the circulating lubrication system comprising:
a misting chamber surrounding the shaft and located proximate the bearings to be lubricated;
a member affixed to and rotating with the shaft for causing lubricant to lubricate the bearings;
a reservoir located remote from and in fluid communication with the misting chamber;
an oil level in the misting chamber maintained below the lower balls of the bearings;
circulating means for circulating the lubricant from the misting chamber to the reservoir and thereafter back to the misting chamber from the reservoir; and
means for filtering the lubricant in the reservoir in order to maintain filtered lubricant in the misting chamber so as to prolong the operating life of the bearings;
a reservoir which includes heat removing fins for reducing the temperature of the oil;
a reservoir fitted with a moisture removing desiccant chamber for removing moisture from the air within the chamber preventing that moisture from contaminating the oil;
an easy to use installation kit with instructions, charts, easily adjustable oil mister blade assembly, versatile finned reservoir multiple entry and exit port choices, drain valve, all required fittings and tubing, desiccant chamber, adjustable level arrow, full length sight glass, replaceable filter, optional adjustable support screws and installation slide template used to determine and set the appropriate oil height for any pump or similar equipment.
According to certain preferred embodiments of this invention, the circulating lubrication system including the external reservoir is used in conjunction with a chemical processing centrifugal pump.
This invention still further fulfills the above-described needs in the art by providing a method of maintaining substantially clean and moisture free lubricating fluid in a misting chamber of a pump, the pump including a rotatable shaft and bearings to be lubricated for supporting the shaft, the method comprising the steps of:
providing the pump including the rotatable shaft and supporting bearings;
providing lubricating fluid in the misting chamber proximate the bearings to be lubricated;
lubricating the bearings by dispersing-the lubricating fluid throughout the misting chamber;
forcing the fluid out of the misting chamber, through a first conduit, and into a fluid reservoir spaced from the misting chamber;
removing moisture from the air within the chamber before it contaminates the oil;
removing heat by way of the fins on the reservoir;
filtering the fluid in the reservoir; and
causing the filtered fluid to flow back into the misting chamber thereby maintaining substantially clean lubricating fluid in the misting chamber.
This invention will now be described with respect to certain embodiments thereof, accompanied by certain illustrations, wherein:
a-5d show the details of the oil mister blade assembly.
a-6c show the oil reservoir with the fins, adjustable oil lever arrow, embossed oil level presets (lettered “A” through “O”), and versatile multiple entry and exit ports.
a and 10b illustrate how the slide rule template 180 can alternatively be used to measure the proper size of the blade 8 of the dispenser 4.
Referring now more particularly to the accompanying drawings in which like reference numerals indicate like parts throughout the several views.
Below described is a circulating lubrication system according to certain embodiments of this invention used in conjunction with a centrifugal pump including a centrally located rotating shaft. However, it will be understood by those skilled in the art that the lubrication system and corresponding external reservoir according to certain embodiments of this invention may be used in conjunction with other rotating equipment that utilize a lubricant sump for the purpose of lubricating shaft supporting bearings.
Referring to
The misting or lubricating system illustrated in
One unique feature of the dispenser 4 is the split supporting band 6 that permits the dispenser to be mounted to an existing shaft without removing existing bearings. The collar is adjustable to fit a wide range of shaft diameters with one standard kit.
Alternatively, when the annular bore 32 through which the dispenser 4 may be inserted is defined by the inner or interior diameter of a hole in the pump frame 3 (on either side of chamber 201), the diameter of dispenser 4 when members 8 are collapsed is less than the diameter of the bore. Thus, the dispenser with collapsed blades 8 may be inserted through the bore and into misting chamber 201. However, once in chamber 201, during pump operation when shaft 202 is rotated, blades 8 “stand up” so that the operating outer diameter of dispenser 4 is greater than the diameter of the bore 32 (and greater than the inner diameter of bearing frame(s) 3, and greater than the diameter defined by the radius at which bearing balls 21 roll in their raceways). The operating diameter of dispenser 4 is of course defined by the diameter around the outer periphery of blades 8 as they rotate within chamber 201.
When the pump shaft 202 is driven by the pump motor, supporting band 6 and blades 8 affixed thereto rotate along with shaft 202 within annular lubricating chamber 201 thereby dispersing lubricating fluid (e.g. oil) throughout chamber 201 as shown in FIG. 1. When shaft 202 is rotated, the blades 8 are caused to extend radially away from shaft 202 (i.e. stand up) due to the centrifugal force created by rotation of the shaft 202. Thus, during rotation of shaft 202 when the pump is pumping, the outer diameter of the dispenser (defined by the outer diameter of blades 8) is greater than the inner diameter of the stationary hole or bore through which it was inserted.
Dispensing members or blades 8 dip into the lubricating fluid 203 below fluid level 19 when shaft 202 is rotated thereby dispensing or flinging the lubricant 203 throughout chamber 201 so that the lubricant makes its way into auxiliary passageways and therefrom down into auxiliary chambers (not mentioned herein). It is noted that the passageways and chambers defining a lubricant delivery passageway may take many forms not discussed herein.
As shown in
Outer bearing portions or outer races 25 work in conjunction with inner bearing portions (i.e. inner races) 27 (affixed to shaft 202) so as to define roller raceways therebetween in which bearing rollers 21 move during shaft 202 rotation. Together, bearing rollers 21 in combination with bearing races 25 and 27 make up at least one pair of the bearings of centrifugal pump which are provided for the purpose of supporting shaft 202 during rotation thereof.
When the lubricant 13 is dispensed throughout chamber 201 by blades 8, the lubricant makes it way through bearings and also down auxiliary passageways, which may be present in some pumps and into chambers on both ends of chamber 201. Once in auxiliary chambers, the lubricant is permitted to lubricate the bearing raceways, frames, and balls on all sides thereby improving performance. From auxiliary chambers, some of the lubricating fluid makes its way back into main chamber 201 through the gap between bearing races or frames 25 and 27. However, some of the lubricant from annular auxiliary chambers makes its way back into main chamber 201 by way of passageways (not shown) disposed below outer bearing races 25. Auxiliary passageways, auxiliary chambers, and passageways are designed so that the lubricating fluid makes its way through chambers and passageways due to the force of gravity and back into main misting chamber 201.
As will be discussed in detail below, main chamber 201 may, according to certain embodiments, be provided with an outlet and inlet in communication with an external lubricant reservoir. These are provided so that the lubricating fluid (e.g. oil) from chamber 201 may be circulated out of the pump, cooled and filtered in the external reservoir, and thereafter recirculated back into chamber 201 by way of the inlet (see FIGS. 3 and 4).
Discussion will now be made of the specific structure and function of the dispenser 4 shown generally in FIG. 2 and shown in greater detail in
With reference to
The spring insert 22 is designed to retain the vane holder 9 in place relative to the support band 6 via a friction-fit arrangement. With this arrangement, the vane holder 9 may be slid along the band 6 to a desired location where the holder 9 is retained in place using the friction-fit arrangement. Of course, other retention systems may be employed to selectively retain the vane holder 9 relative to the band 6.
Each blade 8 is free to pivot about the axis defined by the shaft 10 so that each blade 8 can pivot in either direction about the shaft 10 to which it is pivotally and movably attached. Because each blade 8 can pivot downward in either direction about 90° relative to its extended or “stand up” position (
d is a sectional view taken along section line VI—VI of
The blade(s) 8 in its operating position is caused to extend radially away from the center of shaft 202 due to the centrifugal force created by rotation of the shaft. In other words, each dispensing member or blade 8 is in the position of
Also illustrated in
It is also important to note, relative to
Once mounted to the pump bearing frame, the position of the oil level set point arrow 102 is set on the face of the reservoir 100 according to a predetermined position set by the manufacturing specifications for the pump. The adjustable support screws 104 are used to support the reservoir 100. These adjustable support screws 104 function as mounting feet to alleviate stress on the connecting pipes leading to and from the reservoir 100.
The reservoir 100 shown in
One important aspect of this invention is the slide rule template used to measure the correct positioning of the components of the present invention. For example with reference to
Next, with reference to
Next, with reference to
a and 10b illustrate how the slide rule template 180 can alternatively be used to measure the proper size of the blade 8 of the dispenser 4. The cut line 184 shows where the blades should be trimmed to a maximum diameter.
Numerous advantages are provided by the aforementioned lubrication system for pumps and other rotating components. The invention allows the bearings to operate as much as 50-60° F. cooler by eliminating the viscous drag and plowing effect created by submerged bearings. The invention reduces power consumption slightly by reducing viscous drag that was converted to non-productive heat. The invention adds reserve oil capacity (in most cases doubles) to the pump. The invention continuously filters the oil as it circulates. The invention continuously removes water from the air in the bearing frame and reservoir. The invention adds cooling capacity to the system, both by the external reservoir and by utilizing the entire internal surface of the bearing frame as a heat sink. The invention continuously coats the internals of the bearing frame with oil to minimize any oxidation of iron and steel parts. Because bearing and oil operating temperatures are significantly lower, condensate formation is minimized due to lower differential temperatures. The system allows the use of a closed frame without vents or breathers, which are a prime source for moisture infiltration. When combined with bearing isolators (labyrinth oil seals) which are very effective at keeping oil in, and keeping contaminants out, at the shaft level, the invention makes a significant contribution to any plant program aimed at productivity and cost reduction.
While the foregoing invention has been shown and described with reference to the preferred embodiments, it will be understood by those of skill in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the instant invention.
This application is a continuation-in-part of application Ser. No. 08/645,904, filed May 4, 1996, now abandoned.
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Number | Date | Country | |
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20020146315 A1 | Oct 2002 | US |
Number | Date | Country | |
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Parent | 08645904 | May 1996 | US |
Child | 10158864 | US |