Patent Application
20240209853
This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2022-206710, filed on Dec. 23, 2022, the entire contents of which are incorporated herein by reference.
The present disclosure relates to a reciprocating pump.
Japanese Unexamined Patent Application Publication No. 2021-4604 discloses a pump device. The pump device includes a housing that houses a motor and a pump, and the housing is fixed to an attachment target. The housing and the attachment target are positioned by a positioning pin.
Disclosed herein is an example reciprocating pump. An example reciprocating pump includes a case body having a reciprocating member which reciprocates along a first direction, a manifold having a cylinder portion through which at least a part of the reciprocating member of the case body is inserted, a fastening member which fastens the case body and the manifold, and a position regulating member which regulates a position of the manifold with respect to the case body (10). The position regulating member has a tubular shape having an axial direction along the first direction. A first end of the position regulating member in the first direction is fitted to a first fitting portion formed in the case body. A second end of the position regulating member on a side opposite to the first end in the first direction is fitted to a second fitting portion formed in the manifold. The fastening member fastens the case body and the manifold in a state of being inserted into the position regulating member having the tubular shape.
In some examples, the case body and the manifold are positioned as the first end and the second end of the position regulating member are respectively fitted to the first fitting portion provided in the case body and the second fitting portion provided in the manifold, and the case body and the manifold are fastened by inserting the fastening member into the position regulating member. For example, the first fitting portion and the second fitting portion also serve as insertion holes of the fastening member. Since a dedicated region for the position regulating member is not provided, an increase in sizes of the manifold and the case body is suppressed.
In some examples, the case body includes a plurality of the reciprocating members disposed at equal intervals in a second direction intersecting the first direction. When viewed from the first direction, a pair of the position regulating members may be disposed at point-symmetrical positions with a center position between a pair of the reciprocating members disposed at both ends in the second direction as a reference. In addition, the pair of position regulating members may be disposed on a line along the second direction passing through the center position when viewed from the first direction. In addition, the pair of position regulating members may be disposed at positions sandwiching the plurality of reciprocating members in the second direction. In these configurations, occurrence of misalignment in assembly is suppressed.
The position regulating member may have a cylindrical shape. The first fitting portion and the second fitting portion may have a columnar space. A diameter of the first fitting portion may be configured to be smaller than a diameter of the second fitting portion. In these configurations, the position regulating member tends to remain in the first fitting portion when the case body and the manifold are disassembled.
In some examples, the manifold may include a first manifold fastened to the case body and a second manifold connected to the first manifold. The first manifold and the second manifold are connected to each other by a communication pipe. A seal member positioned in the first direction by the communication pipe is disposed in the cylinder portion of the first manifold. By omitting a seal case for accommodating the seal member, the size of the manifold may be decreased.
In some examples, the fastening member includes a threaded portion extending from the first end of the position regulating member and threaded to the case body, and a head portion configured to clamp the manifold between the head portion and the case body by screwing the threaded portion into the case body.
In some examples, the reciprocating members are located at both ends in the second direction as a reference. The position regulating members viewed from the first direction are located at point-symmetrical positions with a center position between the reciprocating members which are located at both ends in the second direction.
In some examples, the position regulating members are located in the second direction orthogonal to the first direction. In some examples, the reciprocating members are located in the second direction and at positions sandwiched by the position regulating members.
In some examples, a length of the fitting portion in the first direction is longer than a length of the second fitting portion in the first direction.
In some examples, the first manifold portion includes a first divided portion which is a part of the cylinder portion. The second manifold portion includes a second divided portion which is a part of the cylinder portion, and is fluidly coupled with the first divided portion.
In some examples, the manifold includes a communication pipe inserted in the first divided portion and the second divided portion. Additionally, the communication pipe fluidly couples with the first divided portion and the second divided portion.
In some examples, the reciprocating pump includes a seal member located in the first divided portion. The seal member abuts the communicating pipe and is positioned in the first direction by the communication pipe.
In the following description, with reference to the drawings, the same reference numbers are assigned to the same components or to similar components having the same function, and overlapping description is omitted.
Hereinafter, an example reciprocating pump will be described with reference to the accompanying drawings. An example reciprocating pump is a so-called horizontal triplex plunger pump in which plungers forming reciprocating members are arranged in three parallel rows in a horizontal direction. In some examples, “up” and “down” are defined based on a state in which the reciprocating pump is placed on a horizontal plane, and “front” and “rear” are defined based on an axial direction of the reciprocating member such that a pump chamber side is defined as the front, and a crankcase side is defined as the rear. “Left” and “right” are based on the front-rear direction of the reciprocating pump placed on the horizontal plane.
In the drawings, an XYZ orthogonal coordinate system is illustrated for reference. An X direction corresponds to the front-rear direction (an axial direction) of the reciprocating pump, a Y direction corresponds to the left-right direction, and a Z direction corresponds to the up-down direction. In some examples, the X direction is an example of a first direction, the Y direction is an example of a second direction, and the Z direction is an example of a third direction. The second direction and the third direction may intersect the first direction. The second direction may orthogonal to the first direction.
As illustrated in
The crankcase 10 is hollow. In the crankcase 10, a crankshaft 12, a connecting rod 13 rotatably connected to the crankshaft 12, a piston pin 16 rotatably connecting a plunger rod 15 to the connecting rod 13, and the like are disposed, thereby forming a driving part 5 that reciprocally drives the reciprocating member 40 along an axis extending in the X direction. As the crankshaft 12 rotates, the connecting rod 13 and the piston pin 16 operate, and the reciprocating member 40 reciprocates in the front-rear direction inside a cylinder portion 21.
The plunger rod 15 forms a rear half of the reciprocating member 40. The plunger 17 forming a front half of the reciprocating member 40 is connected to a front portion of the plunger rod 15 by a bolt 18. In the reciprocating pump 1 illustrated in
The crankcase 10 includes the cylinder portion 21. The cylinder portion 21 has a cylindrical shape and opens toward the front side of the crankcase 10. An axial direction (e.g., the X direction) of the cylinder portion 21 is orthogonal to an axial direction (e.g., the Y direction) of the crankshaft 12. The piston pin 16 and a distal end of the connecting rod 13 can be disposed inside the cylinder portion 21. In the illustrated example, the three cylinder portions 21 are arranged in parallel in the Y direction.
The crankcase 10 is filled with oil for lubricating and cooling the driving part 5. A seal portion (e.g., an oil seal 26) configured to prevent leakage of the oil in the crankcase 10 is disposed inside the cylinder portion 21. The oil seal 26 is in sliding contact with an outer peripheral surface of the plunger rod 15 forming the reciprocating member 40 in a liquid-tight manner. An end surface of the oil seal 26 on a side closer to the driving part 5 is in contact with an annular stepped surface 21a inside the cylinder portion 21. An annular positioning member 28 is disposed on an end surface of the oil seal 26 on a side closer to the manifold 60.
In the manifold 60, a cylinder portion 61 in which the plunger 17 reciprocates is formed, and the pump chamber 4 is formed on a distal end side of the cylinder portion 61. The manifold 60 is further provided with a suction port 63 configured to introduce a use liquid, such as water, into the pump chamber 4, and a discharge port 65 configured to discharge the use liquid compressed in the pump chamber 4. The suction port 63 and the discharge port 65 are connected by a flow passage. A suction valve 64 is provided in the flow passage on a side closer to the suction port 63, and a discharge valve is provided in the flow passage on a side closer to the discharge port 65. A portion of the flow passage between the suction valve 64 and the discharge valve is connected to the pump chamber 4.
A seal member (e.g., a ring-shaped U-packing 71) functioning as a high-pressure seal and a packing (e.g., a ring-shaped U-packing 72) functioning as a low-pressure seal are disposed in the cylinder portion 61 of the manifold 60. Each of the U-packings 71 and 72 prevent the use liquid from flowing between each of the U-packings 71 and 72 and an outer peripheral surface of the plunger 17 and leaking from the pump chamber 4 to the outside. The U-packings 71 and 72 are disposed so as to be in sliding contact with the outer peripheral surface of the plunger 17 in a liquid-tight manner. The U-packing 71 is disposed at a position closer to the pump chamber 4 than the U-packing 72. The U-packing 71 and the U-packing 72 are separated from each other in the X direction. These U-packings 71 and 72 can be molded using, for example, an elastic material such as rubber.
The U-packing 72 as a sealing unit is accommodated in a seal case 73 disposed in the manifold 60. The seal case 73 may have a substantially cylindrical shape. As illustrated in
An inner peripheral surface of the seal case 73 is enlarged in diameter in two stages from the end 74 on the side closer to the pump chamber 4 toward side closer to the driving part 5 via an inclined surface 77 and a stepped surface 78, and the U-packing 72 is disposed in a region on the side closer to the driving part 5 than the stepped surface 78. The crankcase 10 and the manifold 60 are fastened to each other by a plurality of fastening members 81. For example, the fastening members 81 are six bolts. The fastening member 81 has a first coupling portion 81a coupled to the crankcase 10 and a second coupling portion 81b coupled to the manifold 60. The manifold 60 has through-holes 68 through which the fastening members 81 are inserted, and the crankcase 10 has threaded fastening holes 38 to which the fastening members 81 are fastened at the same positions as the through-holes 68 when viewed from the X direction.
In some examples, the fastening holes 38 may be disposed to be bilaterally symmetrical and vertically symmetrical when viewed from the X direction. For example, the plurality of fastening holes 38 includes two fastening holes 38A and four fastening holes 38B. The fastening holes 38A are formed at positions (both ends in the Y direction) sandwiching the three cylinder portions 21 in the Y direction. The fastening holes 38A are located at positions sandwiching the reciprocating members 40. Two fastening holes 38B are formed in each portion between the cylinder portions 21 adjacent to each other in the Y direction.
The pair of fastening holes 38A may be formed at the same height position as the reference height H and at positions where distances from the center position C are equal to each other. In addition, the fastening holes 38B are formed at positions higher than the reference height H and positions lower than the reference height H so as to have the same deviation amount in the 7, direction from the reference height H. The fastening holes 38B are formed such that distances from the center position C are equal. The fastening holes 38B may be formed at positions equidistant from the respective axes of the cylinder portions 21 adjacent to each other in the Y direction. That is, the fastening hole 38B may be formed at the center between the adjacent cylinder portions 21 in the Y direction.
The through-holes 68 include through-holes 68A opposing the fastening holes 38A and through-holes 68B opposing the fastening holes 38B. The through-holes 68A are formed at positions (both the ends in the Y direction) sandwiching the three cylinder portions 61 in the Y direction. Additionally, the through-holes 68A are located at positions sandwiching the reciprocating members 40 in the Y direction. Two through-holes 68B are formed in each portion between the cylinder portions 61 adjacent to each other in the Y direction.
The through-holes 68A and the fastening holes 38A formed at both the ends in the Y direction accommodate position regulating members 85. The position regulating member 85 regulates a relative position between the crankcase 10 and the manifold 60. For example, the position regulating member 85 regulates a position of the manifold 60 with respect to the crankcase 10 such that an axial center of the cylinder portion 21 and an axial center of the cylinder portion 61 coincide with each other.
The position regulating member 85 has a tubular shape having an axial direction along the X direction. In the example illustrated in
The fitting portion 69 accommodates a portion (e.g., a second end 85b) of the position regulating member 85 on the front side in the X direction. The fitting portion 69 is a columnar space having an axis common to that of the through-hole 68A, and has an inner diameter larger than an inner diameter of the through-hole 68A. The inner diameter of the fitting portion 69 may be substantially the same as the outer diameter of the position regulating member 85. The fitting portion 69 is formed at a rear end of the through-hole 68A. The rear end faces the crankcase 10. The fitting portion 39 and the fitting portion 69 are formed to face each other and mutually share the axis. In the example illustrated in
The fitting portion 39 and the fitting portion 69 are formed in the fastening hole 38A and the through-hole 68A formed at each of both the ends in the Y direction. When viewed from the X direction, the position regulating members 85 are disposed at a point-symmetrical positions with the center position C as a reference, and are disposed on a line (e.g., at the reference height H) along the Y direction passing through the center position C. In addition, a pair of the position regulating members 85 is disposed at positions sandwiching the plurality of reciprocating members 40 in the Y direction.
The fastening member 81 has the first coupling portion 81a (e.g., threaded portion), the second coupling portion 81b (e.g., head portion), and an insertion portion 81c (e.g., shaft portion) inserted in the position regulating member 85. The insertion portion 81e is located between the first coupling portion 81a and the second coupling portion 81b. The first coupling portion 81a extends from the first end 85a of the position regulating member 85 and is threaded to the fastening hole 38A of the crankcase 10. The second coupling portion 81b abuts the manifold 60. The second coupling portion 81b clamps the manifold 60 between the second coupling portion 81b and the crankcase 10 by screwing the first coupling portion 81a into the fastening hole 38A.
As illustrated in
The fastening member 81 passes through the through-hole 68B and is fastened to the fastening hole 38B corresponding to the through-hole 68B. The fastening member 81 passes through the through-hole 68A formed at each of both the ends in the Y direction, and is fastened to the fastening hole 38A corresponding to the through-hole 68A to which the position regulating member 85 is fitted in the state of being inserted into the inside of the position regulating member 85. In a mode of operation where the crankcase 10) and the manifold 60 are fastened by the fastening member 81, the oil seal 26 is pressed and fixed to the stepped surface 21a inside the crankcase 10 via the seal case 73 and the positioning member 28. The U-packing 72 is sandwiched and fixed between the stepped surface 78 of the seal case 73 and the positioning member 28. The U-packing 71 is sandwiched and fixed between the end 74 of the seal case 73 on the side closer to the pump chamber 4 and the stepped surface 76 inside the manifold 60.
The reciprocating pump 1 illustrated in
In some examples, the first end 85a and the second end 85b of the position regulating member 85 are fitted to the fitting portion 39 provided in the crankcase 10 and the fitting portion 69 provided in the manifold 60, respectively, to position the crankcase 10 and the manifold 60. The crankcase 10 and the manifold 60 are fastened by inserting the fastening member 81 into the position regulating member 85. The fitting portion 39 and the fitting portion 69 also serve as insertion holes of the fastening member 81. Since a dedicated region for the position regulating member 85 is not provided, an increase in sizes of the manifold 60 and the crankcase 10 may be suppressed.
The crankcase 10 includes the plurality of (e.g., three or more) reciprocating members 40 disposed at equal intervals in the Y direction intersecting the X direction. When viewed from the X direction, the pair of position regulating members 85 may be disposed at point-symmetrical positions with the center position C between the pair of reciprocating members 40 disposed at both the ends in the Y direction as the reference. The pair of position regulating members 85 may be disposed on a line (e.g., positions at the reference height H) passing through the center position C along the Y direction when viewed from the X direction. The pair of the position regulating members 85 may be disposed at positions sandwiching the plurality of reciprocating members 40 in the Y direction. The plurality of reciprocating members 40 may be disposed between the pair of position regulating members 85 in the Y direction. In these configurations, the occurrence of misalignment in assembly of the crankcase 10 and the manifold 60 is suppressed, and thus, uneven wear of the U-packing 71 and the like may also be suppressed.
The position regulating member 85 may have a cylindrical shape. The fitting portion 39 and the fitting portion 69 may have a columnar space. The diameter of the fitting portion 39 may be configured to be smaller than the diameter of the fitting portion 69 such that when the crankcase 10 and the manifold 60 are disassembled, the position regulating member 85 tends to remain in the fitting portion 39. The position regulating member 85 illustrated in the exploded perspective view of
As illustrated in
One of the pair of the position regulating members 85 is a first position regulating member 85 and the other is a second a first position regulating member 85. A first fastening member 81 is inserted into the first position regulating member 85 and a second fastening member 81 is inserted into the first position regulating member 85. The plurality of reciprocating members 40 are located between the first position regulating members 85 and the second position regulating members 85 in the second direction. One of the reciprocating members 40 is centrally located between the first position regulating member 85 and the second position regulating member 85.
The U-packing 71 positioned in the X direction by the communication pipe 120 is disposed in the first divided portion 61A of the first manifold 60A. The communication pipe 120 is fitted between a step 165 formed in an opening of the second divided portion 61B of the second manifold 60B and a step 164 of an opening on the front side of the first divided portion 61A of the first manifold 60A. The U-packing 72 is disposed on a step 163 formed in an opening of the first divided portion 61A of the first manifold 60A. The U-packing 72 is positioned by a seal retainer 128 having a tubular shape and disposed between the U-packing 72 and the oil seal 26. The seal retainer 128 also positions the oil seal 26. The first manifold 60A and the second manifold 60B cooperate to form the through-hole 68. The position regulating member 85 is held by the fitting portion 39 formed in the fastening hole 38A and the fitting portion 69 formed in the through-hole 68 of the first manifold 60A. In the example illustrated in
Although the example in which the manifold and the crankcase are fastened by the six fastening members has been described, the number of fastening members is not particularly limited. For example, in a reciprocating pump provided with three reciprocating members, a manifold and a crankcase may be fastened by eight fastening members by forming two through-holes 68A and two fastening holes 38A in the Z direction similarly to the through-holes 68B and the fastening holes 38B. In some examples, position regulating members may be accommodated in, for example, a through-hole and a fastening hole on the upper side of one end in the Y direction and a through-hole and a fastening hole on the lower side of the other end in the Y direction so as to be point-symmetrical about the center position C.
Some additional examples are disclosed as follows, with continued reference to the drawings for convenience of description.
An example reciprocating pump (1, 1A) includes a crankcase (10), a manifold (60) connected to the crankcase (10), a reciprocating member (40) located in the crankcase (10) and the manifold (60) and configured to reciprocate along a first direction (X), a tubular position regulating member (85) extending along the first direction, and a fastening member (81) inserted in the position regulating member (85) and configured to fasten the crankcase (10) and the manifold (60). The position regulating member (85) includes a first end (85a) fitted in a first fitting portion of the crankcase (10) and a second end (85b) opposite the first end (85a) in the first direction and fitted in a second fitting portion of the manifold (60).
The fastening member (81) may include a first coupling portion (81a) extending from the position regulating member (85) in the first direction and configured to be threaded to the crankcase (10), a second coupling portion (81b) configured to clamp the manifold (60) between the second coupling portion (81b) and the crankcase by screwing the first coupling portion (81a) into the crankcase (10), and an insertion portion (81c) located between the first coupling portion (81a) and the second coupling portion (81b) and inserted in the position regulating member (85).
The reciprocating pump (1, 1A) may include position regulating members (85) and reciprocating members (40). The position regulating members (85) are located in the second direction (Y) orthogonal to the first direction (X). The reciprocating members (40) are located in the second direction (Y) and between the position regulating members (85).
The crankcase (10) may include a case cylinder portion (21) configured to form a part of a space in which the reciprocating member (40) reciprocates. The manifold (60) may include a manifold cylinder portion (61) fluidly coupled with the case cylinder portion (21) and is configured to form a part of the space in which the reciprocating member (40) reciprocates.
The reciprocating pump (1, 1A) may include a seal case (73) located in the manifold cylinder portion (61) so as to surround a part of the reciprocating member (40), and a packing (72) located between the seal case (73) and the reciprocating member (40).
The reciprocating pump (1, 1A) may include a positioning member (28) located in the case cylinder portion (21) so as to surround a part of the reciprocating member (40) and to abut the packing (72), and a seal portion (26) located in the case cylinder portion (21) so as to surround a part of the reciprocating member (40) and sandwiched between the positioning member (28) and the case cylinder portion (21). The seal case (73) may include a stepped surface (78) which abuts the packing (72) and may be configured to sandwich the packing (72) between the seal case (73) and the positioning member (28).
The reciprocating pump (1, 1A) may include a seal member (71) located in the manifold cylinder portion (61) adjacent the seal case (73) and surrounding a part of the reciprocating member (40) so as to abut the reciprocating member (40).
The manifold cylinder portion (61) may include a first divided portion (61A), a second divided portion (61B) fluidly coupled with the first divided portion (61A), and a communication pipe (120) inserted in and fluidly coupling the first divided portion (61A) and the second divided portion (61B).
| Number | Date | Country | Kind |
|---|---|---|---|
| 2022-206710 | Dec 2022 | JP | national |
