reciprocating pump

Abstract

To provide a reciprocating pump that allows leakage of oil to be suitably grasped.SOLUTION: An oil pan comprises: a housing space S defined by a bottom wall 101, and a side wall 103 erected on a peripheral edge of the bottom wall 101; and a partition wall 107 for partitioning a bottom surface 102 formed by the bottom wall 101, into a first bottom surface region 102a corresponding to a first housing space S1, and a second bottom surface region 102b corresponding to a second housing space S2, so as to partition the housing space S into at least the first housing space S1 and the second housing space S2, and erected on the bottom wall 101.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an oil pan and a reciprocating pump.

Background Art

[0002] Patent Document 1 discloses a reciprocating pump. This pump includes a crankcase as a drive unit and a manifold connected to the crankcase. The crankcase includes a guide portion for guiding a reciprocating member, and the manifold includes a pump chamber into which the tip side of the reciprocating portion is inserted. A space is formed between the guide portion and the pump chamber, in which the space between the pump chamber and the guide portion is liquid-tightly sealed with a sealing member respectively, and a hole communicating with the oil pan is formed in the peripheral wall constituting the space.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the reciprocating pump as described above, the fluid leaked from the sealing member on the pump chamber side and the oil leaked from the sealing member on the guide portion side accumulate in the oil pan through the hole formed in the portion between the guide portion and the pump chamber. That is, a liquid mixture of a liquid such as water and oil accumulates inside the oil pan. In this case, it is considered difficult to confirm the oil leakage. Also, it may be difficult to confirm the amount of leaked oil.

[0005] An object of the present invention is to provide an oil pan and a reciprocating pump capable of appropriately grasping oil leakage.

Means for Solving the Problems

[0006] One example of an oil pan is an oil pan attached to a reciprocating pump (1). The reciprocating pump (1) includes a drive unit (10) including a first cylinder (11), a pump unit (30) including a second cylinder (31) facing the first cylinder (11) in the axial direction, a reciprocating member (50) guided by the first cylinder (11) and the second cylinder (31) to reciprocate, an annular first seal packing (70) in sliding contact with the reciprocating member (50) within the first cylinder (11), an annular second seal packing (49) in sliding contact with the reciprocating member (50) within the second cylinder (31), and a seal packing retainer (60) having a substantially cylindrical shape surrounding a part of the reciprocating member (50) in the circumferential direction and disposed between the first seal packing (70) and the second seal packing (49). A first through hole (67) and a second through hole (69) formed at a position closer to the second seal packing (49) in the axial direction than the first through hole (67) are formed in the peripheral wall (61) of the seal packing retainer (60). The oil pan includes an accommodation space (S) defined by a bottom wall (101) and a side wall (103) erected on the periphery of the bottom wall (101), and a partition wall (107) erected on the bottom wall (101) that partitions the bottom surface (102) formed by the bottom wall (101) into a first bottom surface region (102a) corresponding to the first accommodation space (S1) and a second bottom surface region (102b) corresponding to the second accommodation space (S2) so as to partition the accommodation space (S) into at least the first accommodation space (S1) and the second accommodation space (S2). In a state where the oil pan is attached to the reciprocating pump (1), the first bottom surface region (102a) is located below the first through hole (67) in the vertical direction, and the second bottom surface region (102b) is located below the second through hole (69) in the vertical direction.

[0007] The above oil pan is attached below the seal packing retainer (60) in the reciprocating pump (1) to accommodate the liquid leaking from the seal packing retainer (60). On the peripheral wall (61) of the seal packing retainer (60), a first through hole (67) close to the first seal packing (70) and a second through hole (69) close to the second seal packing (49) are provided. Thus, when the liquid in the first cylinder (11) leaks from the first seal packing (70) side, it is easily drained from the first through hole (67), and when the liquid in the second cylinder (31) leaks from the second seal packing (49) side, it is easily drained from the second through hole (69). The drainage from the first through hole (67) is accommodated in the first bottom region (102a), and the drainage from the second through hole (69) is accommodated in the second bottom region (102b). In this way, since the liquid leaked from the first cylinder (11) and the liquid leaked from the second cylinder (31) are separately accommodated, the leakage of the liquid (oil in one example) from the first cylinder (11) can be appropriately grasped.

[0008] In the second bottom region (102b), a hole portion (111) penetrating the bottom wall (101) may be formed, and a cylindrical portion (109) protruding from the lower surface surrounding the hole portion (111) may be formed on the lower surface of the bottom wall (101). In this configuration, the liquid accumulated in the second bottom region (102b) can be discharged to the outside through the hole portion (111). At this time, by connecting, for example, a hose or the like to the cylindrical portion (109), it can be discharged to an arbitrary location.

[0009] The material of the oil pan may be a resin that transmits visible light. In this configuration, the accommodation space (S) inside the oil pan can be visually confirmed from the outside.

[0010] In a state where the oil pan is connected to the reciprocating pump (1) placed so that the axial direction is along the horizontal plane, at least the first bottom region (102a) of the bottom surface (102) may be inclined with respect to the horizontal plane. In this configuration, the liquid accumulated in the first accommodation space (S1) including the first bottom region (102a) moves in one direction due to the inclination.

[0011] The angle formed by the partition wall (107) and the bottom wall (101) that constitutes the first bottom surface region (102a) is greater than 90 degrees. In this configuration, when the partition wall (107) is arranged along the vertical direction, the first bottom surface region (102a) of the bottom surface (102) is inclined with respect to the horizontal plane.

[0012] The height of the partition wall (107) may be lower than the height of the side wall (103). In this configuration, when either one of the first accommodation space (S1) and the second accommodation space (S2) is filled with liquid, the liquid moves to the other space beyond the partition wall (107).

[0013] A hole (113) penetrating the bottom wall (101) is formed in the first bottom surface region (102a), and a cylindrical portion (115) surrounding the hole (113) and protruding from the lower surface may be formed on the lower surface of the bottom wall (101). In this configuration, the liquid accumulated in the first bottom surface region (102a) can be discharged to the outside through the hole (113). At this time, by connecting, for example, a hose or the like to the cylindrical portion (115), it can be discharged to an arbitrary location.

[0014] The hole (113) may be arranged above the center in the inclination direction in the first bottom surface region (102a) that is inclined with respect to the horizontal plane. In this configuration, since the hole (113) is provided above the water level in the first bottom surface region (102a), the liquid discharged from the first through hole (67) can accumulate below the hole (113).

[0015] In a state where an oil pan is connected to a reciprocating pump (1) placed so that the axial direction is along the horizontal plane, the second bottom surface region (102b) of the bottom surface (102) is inclined with respect to the horizontal plane, and the hole (111) may be arranged below the center in the inclination direction in the second bottom surface region (102b) that is inclined with respect to the horizontal plane. In this configuration, since the hole (111) is provided below the water level in the second bottom surface region (102b), the liquid discharged from the second through hole (69) can be quickly discharged from the hole (111).

[0016] One reciprocating pump includes a drive unit (10) including a first cylinder (11), a pump unit (30) including a second cylinder (31) facing the first cylinder (11) in the axial direction, a reciprocating member (50) guided by the first cylinder (11) and the second cylinder (31) to reciprocate, an annular first seal packing (70) that slidably contacts the reciprocating member (50) within the first cylinder (11), an annular second seal packing (49) that slidably contacts the reciprocating member (50) within the second cylinder (31), a seal packing retainer (60) having a substantially cylindrical shape surrounding a part of the reciprocating member (50) in the circumferential direction and disposed between the first seal packing (70) and the second seal packing (49), and an oil pan (100) disposed below the seal packing retainer (60). A first through hole (67) and a second through hole (69) formed at a position closer to the second seal packing (49) in the axial direction than the first through hole (67) are formed in the peripheral wall (61) of the seal packing retainer (60). The oil pan (100) includes an accommodation space (S) defined by a bottom wall (101) and side walls (103) erected on the periphery of the bottom wall (101), and a partition wall (1007) erected on the bottom wall (101) that partitions the accommodation space (S) into at least a first accommodation space (S1) and a second accommodation space (S2), and the bottom surface (102) formed by the bottom wall (101) is partitioned into a first bottom surface region (102a) corresponding to the first accommodation space (S1) and a second bottom surface region (102b) corresponding to the second accommodation space (S2). The first bottom surface region (102a) is located vertically below the first through hole (67), and the second bottom surface region (102b) is located vertically below the second through hole (69).

Effects of the Invention

[0017] Thus, according to one embodiment of the present invention, it is possible to provide a reciprocating pump that appropriately drains liquid leaking from the pump unit and the drive unit.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0019] Hereinafter, a reciprocating pump of one example will be described with reference to the accompanying drawings. In this specification, as a reciprocating pump of one example, a so-called horizontal triple plunger pump in which plungers constituting a reciprocating member are arranged in three rows in the horizontal direction will be described. In the following description, "up" and "down" are defined based on the state where the reciprocating pump is placed on a horizontal plane, and "front" and "rear" are defined with reference to the axial direction of the reciprocating member, with the pump section side being the front and the drive section side being the rear.

[0020] FIG. 1 is a sectional view showing one of the three plunger pumps constituting the reciprocating pump. In a reciprocating pump 1 of one example, the pump configuration shown in FIG. 1 is arranged in three in the X direction. As shown in FIG. 1, the reciprocating pump 1 includes a drive section 10, a pump section 30, a reciprocating member 50, a seal packing retainer 60, and an oil pan 100. The drive section 10 includes a first cylinder 11. The first cylinder 11 of one example is formed in a crankcase 13. The crankcase 13 is configured to be hollow. Inside the crankcase 13, a crankshaft 15, a connecting rod 17 rotatably connected to the crankshaft 15, a piston pin 18 rotatably connecting the plunger rod 51 to the connecting rod 17, etc. are arranged, and a drive mechanism 19 for reciprocally driving the reciprocating member 50 is constituted by these.

[0021] The first cylinder 11 is cylindrical and has an axial direction orthogonal to the axial direction of the crankshaft 15. In the illustrated example, the axial direction of the crankshaft 15 is along the X direction, and the axial direction of the first cylinder 11 is along the Y direction. Inside the first cylinder 11, a piston pin 18 and the tip of the connecting rod 17 can be arranged.

[0022] The crankcase 13 is filled with oil (the first liquid) for lubricating and cooling the drive mechanism 19. Therefore, an oil filler port 13a for injecting oil into the inner space and a drain plug 13b for discharging the oil are provided in an example of the crankcase 13. Further, on the outer surface of the crankcase 13, a leg portion 13c for mounting the reciprocating pump 1 is formed. For example, when the reciprocating pump 1 is mounted such that the leg portion 13c abuts on a horizontal floor surface, the axial direction of the first cylinder 11 is substantially parallel to the horizontal plane.

[0023] The pump unit 30 is connected to the front end of the crankcase 13 constituting the drive unit 10. The pump unit 30 includes a second cylinder 31 having a cylindrical shape. An example of the pump unit 30 has a first manifold 33 as a discharge manifold and a second manifold 35 as a suction manifold. For example, a pump chamber 37 is provided in the first manifold 33. Further, the second manifold 35 is connected to the first manifold 33 and the crankcase 13 and has a second cylinder 31 communicating with the pump chamber 37. The second cylinder 31 is cylindrical and has an axis that coincides with the axis of the first cylinder 11.

[0024] The second manifold 35 in contact with the crankcase 13 is provided with a suction port 39 for introducing a working liquid such as water into the pump chamber 37, and the first manifold 33 in contact with the second manifold 35 is provided with a discharge port 32 for discharging the working liquid compressed in the pump chamber 37. A suction valve 38 is provided in a flow path 36 communicating the suction port 39 and the pump chamber 37, and a discharge valve 43 is provided in a flow path 41 communicating the pump chamber 37 and the discharge port 32.

[0025] The first manifold 33 and the second manifold 35 are connected via a communication pipe 45. The communication pipe 45 is a member having a substantially cylindrical shape, and is disposed across an opening 37a communicating with a second cylinder 31 of a pump chamber 37 formed in the first manifold 33 and the second cylinder 31 formed in the second manifold 35. The connection portion between the pump chamber 37 and the second cylinder 31 is sealed liquid-tightly by the communication pipe 45. Inside the second cylinder 31, a high-pressure seal packing 47 is provided at a position on the rear side of the communication pipe 45. The high-pressure seal packing 47 is in sliding contact with a plunger sleeve 53 described later to seal the inside of the second cylinder 31 liquid-tightly.

[0026] In the second cylinder 31 of the second manifold 35, a low-pressure seal packing 49 (second seal packing) having a lower seal pressure than the high-pressure seal packing 47 is disposed at a position farther from the crankcase 13 side than the high-pressure seal packing 47. The low-pressure seal packing 49 is in sliding contact with the plunger sleeve 53 to seal the inside of the second cylinder 31 liquid-tightly. Further, in the second manifold 35, a water supply port 42 and a drain port 46 communicating with the inside of the second cylinder 31 are provided between the high-pressure seal packing 47 and the low-pressure seal packing 49. Cooling water can be supplied to the water supply port 42. The cooling water supplied to the water supply port 42 circulates in a space sealed by the high-pressure seal packing 47 and the low-pressure seal packing in the second cylinder 31. This cooling water cools the high-pressure seal packing 47, the plunger sleeve 53, and the low-pressure seal packing 49, and is drained from the drain port 46.

[0027] The reciprocating member 50 includes a plunger rod 51 and a plunger sleeve 53. The plunger rod 51 includes a columnar portion disposed within the first cylinder 11 and is rotatably connected to the connecting rod 17 via a piston pin 18. The plunger sleeve 53 includes a columnar portion disposed within the second cylinder 31 and is connected to the front end of the plunger rod 51 by, for example, bolts 55. In one example, the diameter of the plunger sleeve 53 is configured to be larger than the diameter of the plunger rod 51. In the illustrated example, at the connection position between the plunger sleeve 53 and the plunger rod 51, a flat washer 57 disposed at the end of the plunger sleeve 53 is clamped between the plunger sleeve 53 and the plunger rod 51. The diameter of the flat washer 57 is larger than the diameter of the plunger sleeve 53.

[0028] The reciprocating member 50 reciprocates axially within the first cylinder 11 and the second cylinder 31 via the connecting rod 17 and the piston pin 18 as the crankshaft 15 rotates. As the reciprocating member 50 reciprocates within the first cylinder 11 and the second cylinder 31, a pumping action is performed in a pump chamber 37 formed on the tip side of the second cylinder 31. At this time, the rear end portion 51a (the first end portion) of the plunger rod 51 may be disposed inside the first cylinder 11, and the front end portion 53a (the second end portion) of the plunger sleeve 53 may be disposed inside the second cylinder 31. The connecting portion between the plunger rod 51 and the plunger sleeve 53 is disposed inside a seal packing retainer 60 disposed between the first cylinder 11 and the second cylinder 31.

[0029] The seal packing retainer 60 is disposed between the first cylinder 11 and the second cylinder 31. The seal packing retainer 60 has a substantially cylindrical shape that circumferentially surrounds a part of the reciprocating member 50. For example, the connecting portion between the plunger rod 51 and the plunger sleeve 53 is surrounded by the seal packing retainer 60.

[0030] The seal packing retainer 60 can press the low-pressure seal packing 49 forward. In the illustrated example, a cylindrical collar 48 is disposed between the seal packing retainer 60 and the low-pressure seal packing 49, and the seal packing retainer 60 presses the low-pressure seal packing 49 via the collar 48. The inner diameter of the collar 48 is slightly larger than the outer diameter of the plunger sleeve 53, for example. Further, a stepped portion 48a having a small outer diameter is provided at the rear end of the collar 48.

[0031] Further, the seal packing retainer 60 can hold the oil seal 70 (first seal packing) and press the oil seal 70 rearward. The oil seal 70 is a member that slidably contacts the outer peripheral surface of the plunger rod 51 in a liquid-tight manner and suppresses leakage of oil in the crankcase 13. For example, the oil seal 70 is a member in which a metal ring is covered with a rubber member and has an annular shape.

[0032] FIG. 2 is a cross-sectional perspective view of the seal packing retainer 60, and FIG. 3 is a longitudinal cross-sectional view of the seal packing retainer 60. The seal packing retainer 60 includes a substantially cylindrical peripheral wall 61 and an annular end wall 63 that projects radially inward from the peripheral wall 61. Further, a stepped portion 65 having a larger inner diameter than other portions is formed at the front end of the seal packing retainer 60. In one example, the stepped portion 48a of the collar 48 is fitted into the stepped portion 65 of the seal packing retainer 60.

[0033] A first through hole 67 and a second through hole 69 are formed in the peripheral wall 61 of the seal packing retainer 60. The first through hole 67 communicates the inside and the outside of the peripheral wall 61. The first through hole 67 in one example has a substantially T-shape in which a first elongated hole-shaped portion 67a and a second elongated hole-shaped portion 67b are combined. The first elongated hole-shaped portion 67a has a track shape with the X direction intersecting the axial direction as the longitudinal direction. The second elongated hole-shaped portion 67b has a track shape with the axial direction as the longitudinal direction. The first elongated hole-shaped portion 67a is continuous with the rear side of the second elongated hole-shaped portion 67b so that the central positions in the X direction coincide with each other, and the first through hole 67 has a substantially T-shape.

[0034] The second through hole 69 is formed at a position closer to the low-pressure seal packing 49 in the axial direction than the first through hole 67, that is, at a position on the front side. The second through hole 69 in one example has a substantially T shape in which a first elongated hole-shaped portion 69a and a second elongated hole-shaped portion 69b are combined. The first elongated hole-shaped portion 69a has a track shape with the longitudinal direction in a direction intersecting the axial direction. The second elongated hole-shaped portion 69b has a track shape with the axial direction as the longitudinal direction. The second through hole 69 forms a substantially T shape by the first elongated hole-shaped portion 69a being continuous with the front side in the second elongated hole-shaped portion 69b so that the central positions in the X direction coincide with each other.

[0035] For example, the size in the longitudinal direction (X direction) in the first elongated hole-shaped portions 67a and 69a may be substantially the same as the diameter of the plunger rod 51. Note that being substantially the same as the diameter of the plunger rod 51 means that, as an example, the error from the diameter of the plunger rod 51 is within ±20%.

[0036] The first through hole 67 and the second through hole 69 may be located on the lower surface side of the peripheral wall 61 of the seal packing retainer 60 when the reciprocating pump 1 is placed on a horizontal plane. In one example, the central positions in the X direction of the first through hole 67 and the second through hole 69 coincide with the center line of the plunger rod 51 when viewed from the Z direction. That is, the first through hole 67 and the second through hole 69 are located directly below the plunger rod 51.

[0037] The end wall 63 protrudes radially inward from the peripheral wall 61 at the rear end of the peripheral wall 61 in the axial direction. The end wall 63 in one example has an annular plate shape. The inner diameter of the end wall 63 is larger than at least the outer diameter of the plunger rod 51. In the illustrated example, a holding portion 62 is formed extending in the axial direction from the peripheral wall 61 rearward of the end wall 63. The holding portion 62 has a substantially cylindrical shape. The inner diameter of the holding portion 62 is smaller than the inner diameter of the peripheral wall 61 and larger than the inner diameter of the end wall 63. The holding portion 62 is a portion that holds the oil seal 70. Therefore, the inner diameter of the holding portion 62 may be the same as the outer diameter of the oil seal 70, and the length of the holding portion 62 in the axial direction may be the same as the thickness of the oil seal 70. In the reciprocating pump 1 in one example, the rear end of the seal packing retainer 60 is fitted into the opening of the first cylinder 11.

[0038] In one example, the rear end of the seal packing gland 60 and the opening of the first cylinder 11 may have a pair of engaging portions that engage with each other, and the seal packing gland 60 may be positioned in the circumferential direction. The pair of engaging portions is not particularly limited as long as it allows for circumferential positioning, such as a convex portion that engages with a notch and a convex portion that engages with a recess formed in the axial direction. In a configuration including such a pair of engaging portions, the seal packing gland 60 can be easily positioned so that the first through hole 67 and the second through hole 69 are on the lower surface side in the circumferential direction.

[0039] A recess 62a is formed continuously in the circumferential direction on the outer periphery of the holding portion 62. An O-ring 66 is disposed in the recess 62a. The O-ring 66 provides a liquid-tight seal between the outer periphery of the holding portion 62 and the inner periphery of the opening of the first cylinder 11.

[0040] Moreover, the seal packing gland 60 in one example includes an annular partition wall 68. The partition wall 68 is formed continuously in the circumferential direction at a position between the first through hole 67 and the second through hole 69 in the axial direction. The partition wall 68 protrudes radially inward from the peripheral wall 61. The inner diameter of the partition wall 68 is at least larger than the outer diameter of the flat washer 57.

[0041] Further, the axial distance L1 from the partition wall 68 to the first through hole 67 is smaller than the height L2 of the partition wall 68. Similarly, the axial distance L3 from the partition wall 68 to the second through hole 69 is smaller than the height L2 of the partition wall 68. Note that the height L2 of the partition wall 68 is the dimension in the protruding direction (radial direction) from the inner surface of the peripheral wall 61.

[0042] Also, a part of the periphery of the first through hole 67 is formed along the end wall 63. In one example, the first through hole 67 includes a periphery formed along the outer edge of the end wall 63. In the illustrated example, the position of the rear peripheral edge 67a1 in the axial direction among the peripheries along the longitudinal direction of the first elongated hole shaped portion 67a constituting the first through hole 67 substantially coincides with the position of the outer edge of the end wall 63.

[0043] FIG. 4 is a partially enlarged view of FIG. 1 and shows the vicinity of the oil pan 100. FIG. 5 is a perspective view showing an example of the oil pan. FIG. 6 is a cross-sectional view of an example of the reciprocating pump. In FIG. 6, a cross-section obtained by cutting the reciprocating pump 1 along the XY plane at the position of the hole portion 111 of the oil pan 100 is shown. The oil pan 100 is a liquid storage device that stores the liquid discharged from the first through hole 67 and the second through hole 69. An example of the oil pan 100 temporarily stores the liquid and discharges the stored liquid.

[0044] The oil pan 100 has a storage space S that stores the liquid discharged from the first through hole 67 and the second through hole 69 of the seal packing retainer 60, respectively. The storage space S is defined by a bottom wall 101 and a side wall 103. In one example, the bottom wall 101 has a substantially rectangular shape when viewed from the Z direction. In the illustrated example, in order to store the liquid discharged from each of the three seal packing retainers 60 arranged in the X direction in one oil pan 100, the length of the oil pan 100 in the X direction is at least longer than the distance between the through holes (the second through hole 69 in the example of FIG. 6) of the seal packing retainers 60 at both ends in the X direction.

[0045] The side wall 103 stands upright on the periphery of the bottom wall 101 and surrounds the periphery of the bottom wall 101. That is, the side wall 103 includes a first side wall 103a erected from the edge of the bottom wall 101 on the drive unit 10 side, a second side wall 103b erected from the edge of the bottom wall 101 on the pump unit 30 side, and a third side wall 103c and a fourth side wall 103d connecting the first side wall 103a and the second side wall 103b to each other. Note that the third side wall 103c and the fourth side wall 103d face each other in the X direction and extend along the YZ plane. Support pieces 105 protruding outward from the wall surface are respectively provided on the third side wall 103c and the fourth side wall 103d. In one example, bolt holes 105a are formed in the support pieces 105, and the oil pan 100 is fixed to the crankcase 13 by bolts 105b inserted through the bolt holes 105a. In a state where the oil pan 100 is fixed to the crankcase 13, the Z-direction positions (i.e., height positions) of the respective edges of the first side wall 103a, the second side wall 103b, the third side wall 103c, and the fourth side wall 103d may be the same as each other. Note that portions with different Z-direction positions may be partially formed at the edges of the side wall 103.

[0046] Further, the oil pan 100 includes a partition wall 107 erected on the bottom wall 101. The partition wall 107 divides the accommodation space S into at least a first accommodation space S1 and a second accommodation space S2. That is, the partition wall 107 divides the bottom surface 102 formed by the bottom wall 101 into a first bottom surface region 102a corresponding to the first accommodation space S1 and a second bottom surface region 102b corresponding to the second accommodation space S2. An example of the partition wall 107 extends along the XZ plane with the X direction as the longitudinal direction. In the illustrated example, the first accommodation space S1 is the space on the drive unit 10 side of the accommodation space S with respect to the partition wall 107. Also, the second accommodation space S2 is the space on the pump unit 30 side of the accommodation space S with respect to the partition wall 107. Similarly, the first bottom surface region 102a is the portion of the bottom surface 102 on the drive unit 10 side of the partition wall 107. Also, the second bottom surface region 102b is the portion of the bottom surface 102 on the pump unit 30 side of the partition wall 107.

[0047] In a state where the oil pan 100 is attached to the crankcase 13, the first bottom surface region 102a is located vertically below the first through hole 67. Also, the second bottom surface region 102b is located vertically below the second through hole 69.

[0048] The height position of the partition wall 107 in one example is lower than the height position of the side wall 103. In the case where a portion with a lower height position is partially formed in any of the side walls 103, the height of the partition wall 107 may be formed lower than the portion with the lower height position. In the illustrated example, the height of the partition wall 107 is, for example, about half the height of the side wall 103, but the height position of the partition wall 107 is not limited to this.

[0049] A hole 111 penetrating the bottom wall 101 is formed in the second bottom surface region 102b. Thereby, the second accommodation space S2 communicates with the outside of the accommodation space S through the hole 111. The oil pan 100 in one example has a plurality of holes 111 corresponding to the plurality of seal packing holders 60. In the illustrated example, three holes 111 are arranged spaced apart from each other in the X direction corresponding to the three seal packing holders 60. When viewed from the Y direction, each hole 111 faces the second through hole 69 (the first through hole 67) of the corresponding seal packing holder 60. Also, when viewed from the X direction, the hole 111 is formed on the drive unit 10 side (partition wall 107 side) rather than the center in the Y direction in the second bottom surface region 102b. That is, the hole 111 is formed at a position closer to the partition wall 107 than the second side wall 103b in the Y direction. A cylindrical portion 109 protruding from the lower surface and surrounding each hole 111 is formed on the lower surface (outer surface) of the bottom wall 101. For example, the cylindrical portion 109 has a cylindrical shape with the same inner diameter as the hole 111.

[0050] In a state where the oil pan 100 is connected to the crankcase 13 placed such that the axial direction is along the horizontal plane, the first bottom surface region 102a is inclined in one direction with respect to the horizontal plane. In one example, the entire bottom surface 102 including the first bottom surface region 102a is uniformly inclined with respect to the horizontal plane. In the illustrated example, the bottom surface 102 of the bottom wall 101 slopes downward from the second side wall 103b side toward the first side wall 103a side. That is, in the first bottom surface region 102a, it slopes downward from the partition wall 107 side toward the first side wall 103a side, and in the second bottom surface region 102b, it slopes downward from the second side wall 103b side toward the partition wall 107 side. Thus, due to the inclination of the bottom wall 101, the angle formed between the partition wall 107 and the bottom wall 101 constituting the first bottom surface region 102a is also greater than 90 degrees. Also, the above-described hole portion 111 is arranged below the center in the inclination direction in the second bottom surface region 102b that is inclined with respect to the horizontal plane. That is, the hole portion 111 is arranged below the water level in the second bottom surface region 102b.

[0051] In one example, the material of the oil pan 100 may be a resin material that transmits visible light. An example of such a material is ABS (Acrylonitrile Butadiene Styrene), but the material of the oil pan 100 is not limited to this.

[0052] As described above, the oil pan 100 in one example is an oil pan 100 attached to the reciprocating pump 1. The reciprocating pump 1 includes a drive unit 10 including a first cylinder 11, a pump unit 30 including a second cylinder 31 facing the first cylinder 11 in the axial direction, a reciprocating member 50 guided by the first cylinder 11 and the second cylinder 31 to reciprocate, an annular oil seal 70 in sliding contact with the reciprocating member 50 in the first cylinder 11, an annular low-pressure seal packing 49 in sliding contact with the reciprocating member 50 in the second cylinder 31, and a seal packing retainer 60 having a substantially cylindrical shape surrounding a part of the reciprocating member 50 in the circumferential direction and disposed between the oil seal 70 and the low-pressure seal packing 49. A first through hole 67 and a second through hole 69 formed at a position closer to the low-pressure seal packing 49 in the axial direction than the first through hole 67 are formed in the peripheral wall 61 of the seal packing retainer 60. The oil pan 100 includes an accommodation space S defined by a bottom wall 101 and a side wall 103 erected on the periphery of the bottom wall 101, and a partition wall 107 erected on the bottom wall 101 that partitions the bottom surface 102 formed by the bottom wall 101 into a first bottom surface region 102a corresponding to the first accommodation space S1 and a second bottom surface region 102b corresponding to the second accommodation space S2 so as to partition the accommodation space S into at least the first accommodation space S1 and the second accommodation space S2. In a state where the oil pan 100 is attached to the reciprocating pump 1, the first bottom surface region 102a is located below the first through hole 67 in the vertical direction, and the second bottom surface region 102b is located below the second through hole 69 in the vertical direction.

[0053] In the reciprocating pump 1 described above, the crankshaft 15 rotates, and the reciprocating member 50 connected to the crankshaft 15 via the connecting rod 17 and the piston pin 18 reciprocates. In the water absorption process, the pump chamber 37 is depressurized as the reciprocating member 50 moves backward toward the drive unit 10. As a result, the suction valve 38 of the first manifold 33 opens, and the discharge valves 43 close. The working liquid is sucked into the pump chamber 37 through the suction port 39 and the suction valve 38. On the other hand, in the discharge process, the pump chamber 37 is pressurized as the reciprocating member 50 moves forward toward the pump unit 30. As a result, the suction valve 38 closes, and the discharge valves 43 open. The working liquid in the pump chamber 37 is discharged to the discharge port 32 through the discharge valves 43. That is, the pumping action is performed.

[0054] The oil seal 70 disposed between the first cylinder 11 and the seal packing retainer 60 seals the inside of the first cylinder 11 in a liquid-tight manner. Similarly, the low-pressure seal packing 49 disposed between the second cylinder 31 and the seal packing retainer 60 seals the inside of the second cylinder 31 in a liquid-tight manner. As a result, the oil seal 70 suppresses the leakage of the oil in the first cylinder 11 into the seal packing retainer 60. Further, the low-pressure seal packing 49 suppresses the leakage of the cooling water and the working fluid in the second cylinder 31 into the seal packing retainer 60.

[0055] When the sealing performance of the low-pressure seal packing 49 and the oil seal 70 deteriorates due to aging or the like, oil may leak from between the oil seal 70 and the plunger rod 51, and cooling water may leak from between the low-pressure seal packing 49 and the plunger sleeve 53. The leaked oil or the like is discharged through the seal packing retainer 60. The oil pan 100 is attached below the seal packing retainer 60 in the reciprocating pump 1 to accommodate the liquid discharged from the seal packing retainer 60. The peripheral wall 61 of the seal packing retainer 60 is provided with a first through hole 67 close to the oil seal 70 and a second through hole 69 close to the low-pressure seal packing 49. Thus, when the liquid in the first cylinder 11 leaks from the oil seal 70 side, it is easily drained from the first through hole 67, and when the liquid in the second cylinder 31 leaks from the low-pressure seal packing 49 side, it is easily drained from the second through hole 69. The drainage from the first through hole 67 is accommodated in the first bottom region 102a, and the drainage from the second through hole 69 is accommodated in the second bottom region 102b. In this way, since the liquid leaked from the first cylinder 11 and the liquid leaked from the second cylinder 31 are separately accommodated, the leakage of the liquid (oil) from the first cylinder 11 can be appropriately grasped.

[0056] A hole portion 111 penetrating the bottom wall 101 may be formed in the second bottom region 102b, and a cylindrical portion 109 protruding from the lower surface and surrounding the hole portion 111 may be formed on the lower surface of the bottom wall 101. In this configuration, the liquid accumulated in the second bottom region 102b can be discharged to the outside through the hole portion 111. At this time, by connecting, for example, a hose or the like to the cylindrical portion 109, it can be discharged to an arbitrary location. Also, the liquid accumulated in the first bottom region 102a may be discharged, for example, through the hole portion 111 in the second bottom region 102b across the partition wall. Further, the user may remove the oil pan from the reciprocating pump and discard the liquid accumulated in the first bottom region 102a.

[0057] The material of the oil pan 100 may be a resin that transmits visible light. With this configuration, the accommodation space S of the oil pan 100 can be visually confirmed from the outside. The user can easily know whether oil or cooling water is not accommodated in the accommodation space S of the oil pan 100, that is, whether there is a defect in the oil seal 70 or the low-pressure seal packing 49. Note that the material of the oil pan 100 may be any material that transmits visible light to such an extent that it is possible to determine whether oil is accommodated in the accommodation space S.

[0058] In a state where the oil pan 100 is connected to the reciprocating pump 1 placed so that the axial direction is along the horizontal plane, at least the first bottom surface region 102a of the bottom surface 102 may be inclined with respect to the horizontal plane. With this configuration, the liquid accumulated in the first accommodation space S1 including the first bottom surface region 102a can move in one direction due to the inclination. Therefore, even if the amount of the liquid is small, it is easy to check the liquid.

[0059] Further, the hole portion 111 is disposed below the center in the inclination direction in the second bottom surface region 102b that is inclined with respect to the horizontal plane. Therefore, the liquid accommodated in the second bottom surface region 102b is suppressed from staying in the second bottom surface region 102b and is easily discharged from the hole portion 111 promptly.

[0060] The angle formed by the partition wall 107 and the bottom wall 101 constituting the first bottom surface region 102a is larger than 90 degrees. With this configuration, when the partition wall 107 is arranged along the vertical direction, the first bottom surface region 102a of the bottom surface 102 is inclined with respect to the horizontal plane.

[0061] The height of the partition wall 107 may be lower than the height of the side wall 103. With this configuration, when either one of the first accommodation space S1 and the second accommodation space S2 is filled with liquid, the liquid moves to the other space without exceeding the partition wall 107.

[0062] As described above, the embodiments of the present invention have been described, but the specific forms of the present invention are not limited to the above examples.

[0063] FIG. 7 is a cross-sectional view showing another shape of the oil pan. In one example, the oil pan 200 in FIG. 7 can be used instead of the oil pan 100 of the reciprocating pump 1. The oil pan 200 differs from the oil pan 100 only in that it has a hole portion 113. Hereinafter, the differences between the oil pan 200 and the oil pan 100 will be described.

[0064] The oil pan 200 includes a hole portion 113. The hole portion 113 is formed in the first bottom surface region 102a and penetrates the bottom wall 101. Thereby, the first accommodation space S1 communicates with the outside of the accommodation space S through the hole portion 113. One example of the oil pan 200 has a plurality of hole portions 113 corresponding to the plurality of seal packing holders 60. That is, corresponding to the three seal packing holders 60, the three hole portions 113 are arranged spaced apart from each other in the X direction. Each hole portion 113 faces the first through hole 67 of the corresponding seal packing holder 60. Further, when viewed from the X direction, the hole portion 113 is formed on the pump portion 30 side (partition wall 107 side), that is, above the center in the inclination direction, rather than the center in the Y direction in the first bottom surface region 102a. In other words, the hole portion 113 is formed at a position closer to the partition wall 107 than the first side wall 103a in the Y direction. On the lower surface (outer surface) of the bottom wall 101, cylindrical portions 115 that surround the hole portions 113 and protrude from the lower surface are formed. For example, the cylindrical portion 115 has a cylindrical shape with the same inner diameter as the hole portion 113.

[0065] According to the above configuration, since the hole 113 and the hole 111 are provided in the first bottom region 102a and the second bottom region 102b respectively, the liquid (oil) accumulated in the first accommodation space S1 and the liquid (cooling water) accumulated in the second accommodation space S2 can be discharged separately. Also, since the hole 113 is provided above the water level in the first bottom region 102a, the liquid (oil) discharged from the first through hole 67 is likely to accumulate below the water level than the hole 113. Therefore, even if the amount of the liquid discharged from the first through hole 67 is small, it is easy to confirm the leakage of the liquid. On the other hand, since the hole 111 is provided below the water level in the second bottom region 102b, the liquid (cooling water) discharged from the second through hole 69 can be quickly discharged from the hole 111.

[0066] Note that the oil pan may not have the holes 111 and 113 for discharging the accommodated liquid. In this case, when the liquid is accommodated in the oil pan, the user may remove the oil pan from the reciprocating pump and discard the accommodated liquid.

Explanation of Reference Numerals

[0067] 1... reciprocating pump, 10... drive unit, 11... first cylinder, 30... pump unit, 31... second cylinder, 49... low-pressure seal packing (second seal packing), 50... reciprocating member, 60... seal packing retainer, 61... peripheral wall, 67... first through hole, 69... second through hole, 70... oil seal (first seal packing), 100... oil pan, 101... bottom wall, 102... bottom surface, 102a... first bottom region, 102b... second bottom region, 103... side wall, 107... partition wall, S... accommodation space, S1... first accommodation space, S2... second accommodation space.

Claims

1. A reciprocating pump, comprising: a drive unit (10) including a first cylinder (11); a pump unit (30) including a second cylinder (31) facing the first cylinder (11) in the axial direction; a reciprocating member (50) guided by the first cylinder (11) and the second cylinder (31) to reciprocate; an annular first seal packing (70) in sliding contact with the reciprocating member (50) within the first cylinder (11); an annular second seal packing (49) in sliding contact with the reciprocating member (50) within the second cylinder (31); a seal packing retainer (60) having a substantially cylindrical shape surrounding a part of the reciprocating member (50) in the circumferential direction and disposed between the first seal packing (70) and the second seal packing (49); an oil pan (100) disposed below the seal packing retainer (60), wherein a first through hole (67) and a second through hole (69) formed at a position closer to the second seal packing (49) in the axial direction than the first through hole (67) are formed in a peripheral wall (61) of the seal packing retainer (60); the oil pan (100) has an accommodation space (S) defined by a bottom wall (101) and side walls (103) erected on a periphery of the bottom wall (101), and a partition wall (107) erected on the bottom wall (101) that partitions the bottom surface (102) formed by the bottom wall (101) into a first bottom surface region (102a) corresponding to the first accommodation space (S1) that accommodates at least oil leaked from the first cylinder (11) through the first seal packing (70) and a second bottom surface region (102b) corresponding to the second accommodation space (S2) that accommodates liquid leaked from the second cylinder (31) through the second seal packing (49); the first bottom surface region (102a) is located vertically below the first through hole (67); the second bottom surface region (102b) is located vertically below the second through hole (69); a hole portion (111) penetrating the bottom wall (101) is formed in the second bottom surface region (102b); a cylindrical portion (109) protruding from the lower surface and surrounding the hole portion (111) is formed on a lower surface of the bottom wall (101). A reciprocating pump.

2. 2. The reciprocating pump according to claim 1, wherein the oil pan is made of a resin that transmits visible light.

3. 3. The reciprocating pump according to claim 1, wherein at least the first bottom surface region (102a) of the bottom surface (102) is inclined with respect to the horizontal plane when the axial direction is along a horizontal plane.

4. The reciprocating pump according to any one of claims 1 to 3, wherein an angle between the partition wall (107) and the bottom wall (101) constituting the first bottom surface area (102a) is greater than 90 degrees.

5. The reciprocating pump according to any one of claims 1 to 4, wherein the height of the partition wall (107) is less than the height of the side wall (103).

6. The first bottom surface region (102a) has a hole (113) penetrating the bottom wall (101), The reciprocating pump according to any one of claims 1 to 5, wherein a cylindrical portion (115) is formed on the lower surface of the bottom wall (101) so as to surround the hole (113) and protrude from the lower surface.

7. The reciprocating pump according to claim 6, which relies on claim 3, wherein the hole (113) is arranged above the center of the inclination direction in the first bottom surface region (102a) which is inclined with respect to a horizontal plane.

8. When the axial direction is along a horizontal plane, the second bottom surface region (102b) of the bottom surface (102) is inclined with respect to the horizontal plane, The reciprocating pump according to any one of claims 2 to 7, wherein the hole (111) is positioned below the center of the second bottom surface region (102b) inclined relative to a horizontal plane.

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