Reciprocating pump

Abstract

To provide a reciprocating pump that can restrain an increase in size of a manifold.SOLUTION: A reciprocating pump comprises a case body, a manifold, a fastening member, and a position regulation member. The position regulation member has a cylindrical shape having an axial direction along a first direction. A first end in the first direction in the position regulation member is fitted into a first fitting part formed in the case body. A second end in the first direction in the position regulation member is fitted into a second fitting part formed in the manifold. The fastening member fastens the case body and the manifold while being inserted inside the position regulation member having the cylindrical shape.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a reciprocating pump.

Background Art

[0002] Patent Document 1 discloses a pump device. This pump device has a housing that houses a motor and a pump, and the housing is fixed to an attachment object. The housing and the attachment object are positioned relative to each other by positioning pins.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For example, when aligning the crankcase and the manifold of a reciprocating pump, it is conceivable to use a positioning pin such as a spring pin. In this case, a dedicated flange or the like for holding the pin is provided on the manifold or the like, and it is conceivable that the size of the manifold or the like increases by that amount.

[0005] An object of the present disclosure is to provide a reciprocating pump capable of suppressing an increase in the size of the manifold.

Means for Solving the Problems

[0006] An example of a reciprocating pump includes a case body (10) having a reciprocating member (40) that reciprocates along a first direction, a manifold (60) having a cylinder portion (61) through which at least a portion of the reciprocating member (40) of the case body (10) is inserted, a fastening member (81) that fastens the case body (10) and the manifold (60), and a position regulating member (85) that regulates the position of the manifold (60) relative to the case body (10). The position regulating member (85) has a cylindrical shape with an axial direction along the first direction. The first end (85a) of the position regulating member (85) in the first direction is fitted into a first fitting portion (39) formed in the case body (10). The second end (85b) of the position regulating member (85) opposite to the first end (85a) in the first direction is fitted into a second fitting portion (69) formed in the manifold (60). The fastening member (81) fastens the case body (10) and the manifold (60) while being inserted inside the cylindrical position regulating member (85).

[0007] In the reciprocating pump described above, the first end (85a) and second end (85b) of the position regulating member (85) are fitted into the first fitting portion (39) provided on the case body (10) and the second fitting portion (69) provided on the manifold (60), respectively, thereby positioning the case body (10) and the manifold (60). The case body (10) and the manifold (60) are then fastened together by inserting the fastening member (81) through the position regulating member (85). In other words, the first fitting portion (39) and the second fitting portion (69) also serve as insertion holes for the fastening member (81). Since there is no need to provide a dedicated area for the position regulating member (85), an increase in the size of the manifold (60) and the case body (10) is suppressed.

[0008] The case body (10) has a plurality of reciprocating members (40) arranged at equal intervals in a second direction intersecting a first direction. Viewed from the first direction, the position regulating members (85) may be arranged in pairs at point-symmetric positions with respect to the center position (C) between the pair of reciprocating members (40) located at both ends in the second direction. Alternatively, the pair of position regulating members (85) may be arranged on a line along the second direction passing through the center position (C) when viewed from the first direction. Alternatively, the pair of position regulating members (85) may be positioned in the second direction, sandwiching the plurality of reciprocating members (40). These configurations suppress the occurrence of misalignment during assembly.

[0009] The position regulating member (85) may be cylindrical in shape. The first fitting portion (39) and the second fitting portion (69) may have a cylindrical space. The diameter of the first fitting portion (39) may be smaller than the diameter of the second fitting portion (69). In this configuration, when the case body (10) and the manifold (60) are disassembled, the position regulating member (85) is likely to remain in the first fitting portion (39).

[0010] The manifold (60) may have a first manifold (60A) fastened to the case body (10) and a second manifold (60B) connected to the first manifold (60A). The first manifold (60A) and the second manifold (60B) are connected to each other by a connecting pipe (120). A sealing member (71), positioned in a first direction by the connecting pipe (120), is arranged in the cylinder portion (61) of the first manifold (60A). In this configuration, a seal case for housing the sealing member (71) inside is not required, thus preventing an increase in the size of the manifold (60). [Effects of the Invention]

[0011] Thus, according to this disclosure, it is possible to provide a reciprocating pump that can suppress an increase in the size of the manifold. [Brief explanation of the drawing]

[0012] [Figure 1]This is a side view of an example of a reciprocating pump. [Figure 2] This is a cross-sectional view along line II-II in Figure 1. [Figure 3] This is a magnified view of a portion of Figure 2. [Figure 4] This is a disassembled perspective view of an example of a reciprocating pump. [Figure 5] This is a cross-sectional view of the main part of a reciprocating pump, relating to another example. [Modes for carrying out the invention]

[0013] The following describes an example of a reciprocating pump, with reference to the attached drawings. For convenience, the same elements are denoted by the same reference numerals, and redundant explanations are omitted. In this specification, as an example of a reciprocating pump, a so-called horizontal triple-plunger pump is described, in which three plungers constituting the reciprocating member are arranged horizontally. In the following description, "up" and "down" are defined based on the state in which the reciprocating pump is mounted on a horizontal surface, and "front" and "rear" are defined based on the axial direction of the reciprocating member, with the pump chamber side being the front and the crankcase side being the rear. "Left" and "right" are based on the front-rear direction of the reciprocating pump mounted on a horizontal surface. For reference, the drawings show an XYZ Cartesian coordinate system. The X direction (first direction) corresponds to the front-rear direction (axial direction) of the reciprocating pump, the Y direction (second direction) corresponds to the left-right direction, and the Z direction (third direction) corresponds to the up-down direction.

[0014] Figure 1 is a side view of an example of a reciprocating pump. Figure 2 is a cross-sectional view along line II-II in Figure 1, and Figure 3 is an enlarged view of Figure 2. Figure 4 is an exploded perspective view of an example of a reciprocating pump. An example of a reciprocating pump is, for example, a plunger pump, which may be a so-called horizontal triple plunger pump in which three plungers 17 constituting the reciprocating member 40 are arranged horizontally in parallel.

[0015] As shown in Figures 1 and 2, the reciprocating pump 1 includes a crankcase (case body) 10 and a manifold 60 connected to the crankcase 10. As shown in Figure 2, the reciprocating pump 1 performs its pumping action in the pump chamber 4 within the manifold 60 by the reciprocating movement of a reciprocating member 40 located within the crankcase 10 and the manifold 60.

[0016] The crankcase 10 is hollow. Inside the crankcase 10 are 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. These constitute a drive unit 5 that drives the reciprocating member 40 back and forth along an axis extending in the X direction. As the crankshaft 12 rotates, the connecting rod 13 and the piston pin 16 move, causing the reciprocating member 40 to reciprocate in the front-back direction inside the cylinder section 21.

[0017] The plunger rod 15 constitutes the rear half of the reciprocating member 40. The plunger 17, which constitutes the front half of the reciprocating member 40, is connected to the front of the plunger rod 15 by a bolt 18. In the illustrated example, three reciprocating members 40 extending in the X direction are arranged side by side at equal intervals in the Y direction. The heights of the axes of the three reciprocating members 40 in the Z direction coincide with each other. That is, the three reciprocating members 40 are formed on the same horizontal plane. Unless otherwise specified below, the height position in the Z direction of the axes of the three reciprocating members 40 will be called the "reference height H," and the position of the axis of the reciprocating member 40 located at the center in the Y direction will be called the "center position C."

[0018] The crankcase 10 includes a cylinder section 21. The cylinder section 21 is cylindrical and opens toward the front of the crankcase 10. The axial direction (X direction) of the cylinder section 21 is perpendicular to the axial direction (Y direction) of the crankshaft 12. Inside the cylinder section 21, a piston pin 16 and the tip of a connecting rod 13 may be located. In the illustrated example, three cylinder sections 21 are arranged side by side in the Y direction.

[0019] The crankcase 10 is filled with oil for lubricating the drive unit 5 and for cooling. Inside the cylinder part 21, an oil seal 26 for preventing the leakage of the oil in the crankcase 10 is arranged. The oil seal 26 is in liquid-tight sliding contact with the outer peripheral surface of the plunger rod 15 that constitutes the reciprocating member 40. The end face of the oil seal 26 on the drive unit 5 side abuts against the annular stepped surface 21a inside the cylinder part 21. An annular positioning member 28 is arranged on the end face of the oil seal 26 on the manifold 60 side.

[0020] Inside the manifold 60, a cylinder part 61 in which the plunger 17 reciprocates is formed, and on the tip side of the cylinder part 61, the above-described pump chamber 4 is formed. Further, the manifold 60 is provided with a suction port 63 for introducing a working liquid such as water into the pump chamber 4, and a discharge port 65 for discharging the working liquid compressed in the pump chamber 4. The suction port 63 and the discharge port 65 are connected by a flow path. A suction valve 64 is provided on the suction port 63 side of the flow path, and a discharge valve (not shown) is provided on the discharge port 65 side of the flow path. And the portion between the suction valve 64 and the discharge valve in the flow path is connected to the pump chamber 4.

[0021] Also, in the cylinder part 61 of the manifold 60, a ring-shaped U-packing 71 that functions as a high-pressure seal and a ring-shaped U-packing 72 that functions as a low-pressure seal are arranged. The U-packings 71, 72 prevent the working fluid from leaking from the pump chamber 4 through between the outer peripheral surface of the plunger 17. The U-packings 71, 72 are arranged so as to be in liquid-tight sliding contact with the outer peripheral surface of the plunger 17. The U-packing 71 is arranged 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, 72 can be formed of an elastic material such as rubber.

[0022] The U-packing 72, which serves as a sealing means, is housed in a seal case 73 located within the manifold 60. The seal case 73 may be substantially cylindrical in shape. As shown in Figure 3, the end 74 of the seal case 73 on the pump chamber 4 side abuts against a stepped surface 75 formed within the manifold 60. The U-packing 71 on the pump chamber 4 side is positioned between the end 74 of the seal case 73 on the pump chamber 4 side and the stepped surface 76 within the manifold 60.

[0023] Furthermore, the inner circumferential surface of the seal case 73 is widened in two stages from the end 74 on the pump chamber 4 side toward the drive unit 5 side via an inclined surface 77 and a stepped surface 78, and the U-packing 72 is positioned in the area on the drive unit 5 side of the stepped surface 78.

[0024] The crankcase 10 and the manifold 60 are fastened to each other by a plurality of fastening members 81. In the illustrated example, the plurality of fastening members 81 are six bolts. The manifold 60 has through holes 68 through which the fastening members 81 are inserted, and the crankcase 10 has threaded fastening holes 38 at the same positions as the through holes 68 when viewed from the X direction, through which the fastening members 81 are fastened.

[0025] For example, the fastening holes 38 may be arranged symmetrically from left to right and vertically when viewed from the X direction. In one example, the multiple fastening holes 38 include two fastening holes 38A and four fastening holes 38B. The fastening holes 38A are formed at positions (both ends in the Y direction) that sandwich the three cylinder portions 21 (i.e., reciprocating members 40) in the Y direction. Two fastening holes 38B are formed between adjacent cylinder portions 21 in the Y direction.

[0026] The pair of fastening holes 38A may be formed at the same height as the reference height H, and at equal distances from the center position C. The fastening holes 38B are formed at positions higher and lower than the reference height H, such that the amount of displacement in the Z direction from the reference height H is the same. Furthermore, the fastening holes 38B are formed at equal distances from the center position C. For example, the fastening holes 38B may be formed at positions equidistant from the axes of adjacent cylinder portions 21 in the Y direction. That is, the fastening holes 38B may be formed at the centers of adjacent cylinder portions 21 in the Y direction.

[0027] The through-hole 68 has two through-holes: one facing the fastening hole 38A and another facing the fastening hole 38B. Specifically, the through-holes 68A are formed at positions (both ends in the Y direction) that sandwich the three cylinder portions 61 (i.e., the reciprocating members 40). Two through-holes 68B are formed between adjacent cylinder portions 61 in the Y direction.

[0028] The through holes 68A and fastening holes 38A formed at both ends in the Y direction house the position regulating member 85. The position regulating member 85 regulates the relative position between the crankcase 10 and the manifold 60. That is, the position regulating member 85 regulates the position of the manifold 60 relative to the crankcase 10 so that the axis of the cylinder portion 21 and the axis of the cylinder portion 61 coincide with each other.

[0029] One example of a position regulating member 85 has a cylindrical shape with an axial direction along the X direction. The illustrated example of a position regulating member 85 has a cylindrical shape. The inner and outer diameters of the position regulating member 85 may be uniform throughout its entire longitudinal direction. Such a position regulating member 85 can be held in a state where it is fitted into a fitting portion 39 (first fitting portion) formed in the fastening hole 38A and a fitting portion 69 (second fitting portion) formed in the through hole 68A. The fitting portion 39 accommodates the rear portion (first end 85a) of the position regulating member 85 in the X direction. The fitting portion 39 is a cylindrical space that shares an axis with the fastening hole 38A and has an inner diameter larger than the inner diameter of the fastening hole 38A. The inner diameter of the fitting portion 39 may be approximately the same as the outer diameter of the position regulating member 85. The fitting portion 39 is formed at the front end of the fastening hole 38A (i.e., the portion facing the manifold 60).

[0030] The fitting portion 69 accommodates the front portion (second end 85b) in the X direction of the position regulating member 85. The fitting portion 69 is a cylindrical space that shares an axis with the through hole 68A and has an inner diameter larger than the inner diameter of the through hole 68A. The inner diameter of the fitting portion 69 may be approximately the same as the outer diameter of the position regulating member 85. The fitting portion 69 is formed at the rear end of the through hole 68A (i.e., the portion facing the crankcase 10). That is, the fitting portion 39 and the fitting portion 69 are formed facing each other and share an axis. In one example, the inner diameter (diameter) of the fitting portion 39 may be slightly smaller than the inner diameter (diameter) of the fitting portion 69. In other words, when the position regulating member 85 is fitted into the fitting portion 39 and the fitting portion 69, the force required to fit the position regulating member 85 into the fitting portion 39 may be greater than the force required to fit the position regulating member 85 into the fitting portion 69. To put it another way, the force required to remove the position regulating member 85 from the fitting portion 39 may be greater than the force required to remove the position regulating member 85 from the fitting portion 69.

[0031] As described above, the fitting portion 39 and the fitting portion 69 are formed in the fastening holes 38A and through holes 68A formed at both ends in the Y direction. Therefore, when viewed from the X direction, the position regulating member 85 is positioned symmetrically with respect to the center position C, and is located on a line (reference height H) along the Y direction passing through the center position C. Furthermore, the pair of position regulating members 85 are positioned in the Y direction, sandwiching the multiple reciprocating members 40.

[0032] The fastening member 81 is passed through through holes 68B formed between adjacent reciprocating members 40 in the Y direction and fastened to a corresponding fastening hole 38B. The fastening member 81 is also passed through through holes 68A formed at both ends in the Y direction and inserted inside the position regulating member 85, and fastened to a corresponding fastening hole 38A into which the position regulating member 85 is fitted. In this state, with the crankcase 10 and manifold 60 fastened by the fastening member 81, the oil seal 26 is pressed against 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 pump chamber 4 side and the stepped surface 76 inside the manifold 60.

[0033] As described above, an example of a reciprocating pump 1 includes a crankcase 10 having a reciprocating member 40 that reciprocates along the X direction, a manifold 60 having a cylinder portion 61 through which at least a part of the reciprocating member 40 of the crankcase 10 is inserted, a fastening member 81 that fastens the crankcase 10 and the manifold 60 together, and a position regulating member 85 that regulates the position of the manifold 60 relative to the crankcase 10. The position regulating member 85 has a cylindrical shape with an axial direction along the X direction. The first end 85a of the position regulating member 85 is fitted into a fitting portion 39 formed on the crankcase 10. The second end 85b of the position regulating member 85 is fitted into a fitting portion 69 formed on the manifold 60. The fastening member 81 fastens the crankcase 10 and the manifold 60 together while being inserted inside the cylindrical position regulating member 85.

[0034] In the reciprocating pump 1 described above, the crankcase 10 and the manifold 60 are positioned by fitting the first end 85a and the second end 85b of the position regulating member 85 to the fitting portion 39 provided on the crankcase 10 and the fitting portion 69 provided on the manifold 60, respectively, and the crankcase 10 and the manifold 60 are fastened together by inserting the fastening member 81 through the position regulating member 85. In other words, the fitting portion 39 and the fitting portion 69 also serve as insertion holes for the fastening member 81. Since there is no need to provide a dedicated area for the position regulating member 85, an increase in the size of the manifold 60 and the crankcase 10 is suppressed.

[0035] The crankcase 10 has a plurality of reciprocating members 40 (three in the above example) arranged at equal intervals in the Y direction intersecting the X direction. When viewed from the X direction, the position regulating members 85 may be arranged in pairs at point-symmetric positions with respect to the center position C between the pair of reciprocating members 40 located at both ends in the Y direction. Alternatively, when viewed from the X direction, the pair of position regulating members 85 may be arranged on a line along the Y direction passing through the center position C (i.e., at the position of the reference height H). Alternatively, the pair of position regulating members 85 may be arranged in the Y direction to sandwich the plurality of reciprocating members 40. In other words, the plurality of reciprocating members 40 may be arranged between the pair of position regulating members 85 in the Y direction. With these configurations, the occurrence of misalignment during assembly between the crankcase 10 and the manifold 60 is suppressed, and therefore uneven wear of the U packing 71 and the like is suppressed.

[0036] The position regulating member 85 may be cylindrical in shape. The fitting portion 39 and the fitting portion 69 may have a cylindrical space. The diameter of the fitting portion 39 may be smaller than the diameter of the fitting portion 69. In this configuration, when the crankcase 10 and the manifold 60 are disassembled, the position regulating member 85 is more likely to remain in the fitting portion 39 (for example, in the exploded perspective view of Figure 4, the position regulating member 85 is fitted into the fitting portion of the crankcase 10). Therefore, the user can easily handle the removed manifold 60, and the burden of maintenance work can be reduced. It is also conceivable to form the position regulating member 85 and the crankcase 10 as a single unit, but in that case, not only will the effort required to process the crankcase increase, but if the part corresponding to the position regulating member is damaged, it will be necessary to replace the entire crankcase. In this embodiment, since the crankcase 10 and the position regulating member 85 are separate components, even if the position regulating member 85 is damaged, the reciprocating pump can be used continuously by simply replacing the position regulating member 85 without having to replace the crankcase 10.

[0037] While embodiments of this disclosure have been described above, the specific forms of this disclosure are not limited to the examples described above.

[0038] Figure 5 is a cross-sectional view of the main part of a reciprocating pump according to another example. In the example of Figure 5, instead of manifold 60, a first manifold 60A fastened to the crankcase 10 and a second manifold 60B connected to the first manifold 60A are used. The first manifold 60A and the second manifold 60B are connected to each other via a connecting pipe 120. A U-packing 71, positioned in the X direction by the connecting pipe 120, is placed in the cylinder portion 61A of the first manifold 60A. The connecting pipe 120 is fitted between a stepped portion 165 formed in the opening of the cylinder portion 61B of the second manifold 60B and a stepped portion 164 in the front opening of the cylinder portion 61A of the first manifold 60A. In addition, a U-packing 72 is placed in the stepped portion 163 formed in the opening of the cylinder portion 61A of the first manifold 60A. The U-packing 72 is positioned by a cylindrical seal retainer 128 positioned between it 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 a through hole 68. The position regulating member 85 is held in place by a fitting portion 39 formed in the fastening hole 38A and a fitting portion 69 formed in the through hole 68 of the first manifold 60A. With this configuration, a seal case is not required to house the U-packing 71 inside, thus preventing an increase in the size of the manifold 60. Furthermore, for example, when replacing only the U-packing 71, the second manifold 60B can be removed while the crankcase and the first manifold 60A remain connected by the position regulating member 85, thus reducing maintenance effort.

[0039] Furthermore, although an example was shown in which the manifold and crankcase are fastened by six fastening members, the number of fastening members is not particularly limited. For example, in a reciprocating pump provided with three reciprocating members, the manifold and crankcase may be fastened by eight fastening members by forming two through-holes 68A and fastening holes 38A in the Z direction, similar to the through-holes 68B and fastening holes 38B. In this case, the position regulating members may be housed in, for example, the upper through-hole and fastening hole at one end in the Y direction and the lower through-hole and fastening hole at the other end in the Y direction, so as to be point-symmetric with respect to the central position C.

[0040] The technology of this disclosure may be described as follows: [1] A case body having a reciprocating member that moves back and forth 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 for fastening the case body and the manifold, The system includes a position regulating member that restricts the position of the manifold relative to the case body, The position regulating member has a cylindrical shape with an axial direction along the first direction, The first end of the position regulating member in the first direction is fitted into the first fitting portion formed in the case body. The second end of the position regulating member, opposite to the first end in the first direction, is fitted into the second fitting portion formed in the manifold. The fastening member fastens the case body and the manifold in a reciprocating pump, with the fastening member inserted inside a cylindrical position-regulating member. [2] The case body has a plurality of the reciprocating members arranged at equal intervals in a second direction intersecting the first direction, The reciprocating pump according to [1], wherein, viewed from the first direction, the position regulating members are arranged in pairs at point-symmetric positions with respect to the center position between the pair of reciprocating members arranged at both ends in the second direction. [3] The reciprocating pump according to [2], wherein a pair of position regulating members are arranged on a line along the second direction passing through the center position when viewed from the first direction. [4] The reciprocating pump according to [2] or [3], wherein the pair of position regulating members are positioned to sandwich the plurality of reciprocating members in the second direction. [5] The position regulating member has a cylindrical shape, The first fitting portion and the second fitting portion have a cylindrical space, A reciprocating pump according to any one of [1] to [4], wherein the diameter of the first fitting portion is smaller than the diameter of the second fitting portion. [6] The manifold comprises 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 connecting pipe. A reciprocating pump according to any one of [1] to [5], wherein a sealing member positioned in the first direction by the connecting pipe is arranged in the cylinder portion of the first manifold. [Explanation of symbols]

[0041] 1... Reciprocating pump, 10... Crankcase (case body), 39... Fitting part (first fitting part), 40... Reciprocating member, 60... Manifold, 61... Cylinder part, 69... Fitting part (second fitting part), 81... Fastening member, 85... Position regulating member, 85a... First end, 85b... Second end.

Claims

1. A case body (10) having a reciprocating member (40) that moves back and forth along a first direction, A manifold (60) having a cylinder portion (61) through which at least a part of the reciprocating member (40) of the case body (10) is inserted, A fastening member (81) fastens the case body (10) and the manifold (60), The system includes a position regulating member (85) that restricts the position of the manifold (60) relative to the case body (10), The position regulating member (85) has a cylindrical shape with an axial direction along the first direction, The first end (85a) of the position regulating member (85) in the first direction is fitted into the first fitting portion (39) formed in the case body (10), The second end (85b) of the position regulating member (85), opposite to the first end (85a) in the first direction, is fitted into the second fitting portion (69) formed on the manifold (60). The fastening member (81) fastens the case body (10) and the manifold (60) while being inserted inside the cylindrical position regulating member (85). The manifold (60) includes a first manifold (60A) fastened to the case body (10) and a second manifold (60B) connected to the first manifold (60A). A first step portion (164) is formed in the opening of the cylinder portion (61) in the first manifold (60A). In the opening of the cylinder portion (61) of the second manifold (60B), a second step portion (165) is formed facing the first step portion (164). The space formed by the first stepped portion (164) and the second stepped portion (165) houses a connecting pipe (120) and a sealing member (71) that connect the first manifold (60A) and the second manifold (60B). The sealing member (71) is positioned in the first direction by the connecting pipe (120) in a reciprocating pump.

2. The case body (10) has a plurality of reciprocating members (40) arranged at equal intervals in a second direction intersecting the first direction, The reciprocating pump according to claim 1, wherein, when viewed from the first direction, the position regulating members (85) are arranged in pairs at point-symmetric positions with respect to the center position (C) between the pair of reciprocating members (40) arranged at both ends in the second direction.

3. The reciprocating pump according to claim 2, wherein the pair of position regulating members (85) are arranged on a line along the second direction passing through the center position (C) when viewed from the first direction.

4. The reciprocating pump according to claim 2, wherein the pair of position regulating members (85) are positioned to sandwich the plurality of reciprocating members (40) in the second direction.

5. The position regulating member (85) has a cylindrical shape, The first fitting portion (39) and the second fitting portion (69) have a cylindrical space, The reciprocating pump according to any one of claims 1 to 4, wherein the diameter of the first fitting portion (39) is smaller than the diameter of the second fitting portion (69).

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