Fluid flow structures and reciprocating pumps

Abstract

To provide a fluid circulation mechanism which suppresses enlargement of a clearance between members that grip a seal member.SOLUTION: A fluid circulation structure in one embodiment comprises an attachment member 110, a manifold unit 130 which is arranged spaced from the attachment member 110 in an axial direction and defines a fluid flow passage, and a plurality of seal cases 160 gripped by the attachment member 110 and the manifold unit 130 and each including an internal space which is in communication with the flow passage of the manifold unit 130. The manifold unit 130 has a first inclined surface 149. Each of he seal cases 160 has a second inclined surface 169 opposite the first inclined surface 149. An endless seal member 171 is arranged between the first inclined surface 149 and the second inclined surface 169.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to a fluid flow structure and a reciprocating pump.

Background Art

[0002] Patent Document 1 discloses a multi-cylinder reciprocating pump. In this pump, three parallel cylinder chambers are provided. A reciprocating plunger is arranged in each cylinder chamber. The cylinder in which the cylinder chamber is provided is sandwiched between a housing and a cylinder head.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a multi-cylinder reciprocating pump as described above, it is conceivable to have a plurality of seal cases (cylinders) that respectively house a plurality of reciprocating members so that each of the plurality of reciprocating members can reciprocate. In this case, for example, a fluid flow structure can be configured by sandwiching a plurality of seal cases (third members) between a first member provided in a crankcase and a second member in which a fluid flow path is formed. A seal member such as an O-ring may be arranged between each seal case and the second member. Here, since there are tolerances in the axial sizes of the seal case, the first member, and the second member, there is a variation in the distance from the second member between the plurality of seal cases. When the distance between the seal case and the second member increases, it is conceivable that the arrangement position of the seal member shifts in response to the pressure fluctuation of the fluid.

[0005] The present disclosure aims to provide a fluid flow mechanism that suppresses the increase in the gap between the second member and the third member that sandwich the sealing member. [Means for solving the problem]

[0006] One example of a fluid flow structure includes a first member (110), a second member (130) positioned spaced apart from the first member (110) and defining a fluid flow path, and a plurality of third members (160) sandwiched between the first member (110) and the second member (130), each containing an internal space (S) that communicates with the flow path of the second member (130). The second member (130) has a frame-shaped first inclined surface (149) corresponding to each of the plurality of third members (160), which is inclined with respect to the clamping direction of the third member (160). The third member (160) has a frame-shaped second inclined surface (169) facing the first inclined surface (149) of the second member (130), which is inclined with respect to the clamping direction of the third member (160) in the same way as the first inclined surface (149). An endless sealing member (171) is positioned between the first inclined surface (149) and the second inclined surface (169).

[0007] In the fluid flow structure described above, the first inclined surface (149) and the second inclined surface (169) that clamp the seal member (171) are similarly inclined with respect to the clamping direction of the third member (160). In this case, the magnitude of the gap formed between the third member (160) and the second member (130) in the direction perpendicular to the first inclined surface (149) and the second inclined surface (169) is smaller than the magnitude along the clamping direction. In this way, the gap between the second member (130) and the third member (160) that clamp the seal member (171) is suppressed from becoming larger.

[0008] The second inclined surface (169) expands toward the second member (130), and the sealing member (171) may be positioned between the first inclined surface (149) and the second inclined surface (169) closer to the first member (110) than to the center in the clamping direction of the third member (160). In this configuration, the size (circumferential length) of the sealing member (171) can be reduced. This reduces the force exerted on the sealing member (171) by the internal pressure.

[0009] The first inclined surface (149) and the second inclined surface (169) may be inclined at an angle of 45° with respect to the clamping direction of the third member (160). In this configuration, the sealing member (171) clamped by the first inclined surface (149) and the second inclined surface (169) is more easily deformed uniformly, thus suppressing deterioration of the sealing member (171). Note that the "45° angle" does not mean exactly 45°, and an error is permitted.

[0010] The second inclined surface (169) may have a notched portion (169a) for holding the sealing member (171). In particular, in a configuration where the second inclined surface (169) widens toward the second member (130), the assembly of the second member (130) and the third member (160) can be easily performed.

[0011] One example of a reciprocating pump includes a first member (110) fixed to the front end of a crankcase (10) having a plunger (43) that reciprocates in the axial direction, a second member (130) positioned axially spaced apart from the first member (110) and defining a fluid flow path, and a plurality of third members (160) sandwiched between the first member (110) and the second member (130), each containing an internal space (S) that communicates with the flow path of the second member (130). The plunger (43) is capable of reciprocating within the internal spaces (S) of each of the plurality of third members (160). The second member (130) has a frame-shaped first inclined surface (149) that is inclined with respect to the clamping direction of the third member (160), corresponding to each of the plurality of third members (160). The third member (160) has a frame-shaped second inclined surface (169) facing the first inclined surface (149) of the second member (130), which is inclined with respect to the clamping direction of the third member (160) in the same way as the first inclined surface (149). An endless sealing member (171) is positioned between the first inclined surface (149) and the second inclined surface (169).

[0012] The second member (130) may include a manifold (131) and a plurality of valves (140) fixed to the manifold (131). The first inclined surface (149) may be formed on each of the plurality of valves (140). In this configuration, the influence of the tolerances of the plurality of valves (140) on the gap can be reduced. [Effects of the Invention]

[0013] According to the fluid flow mechanism of this disclosure, it is possible to suppress the increase in the gap between the second member and the third member that sandwich the sealing member. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view showing the external appearance of an example of a reciprocating pump. [Figure 2] This is a cross-sectional view of an example of a reciprocating pump. [Figure 3] This is a cross-sectional view showing the main components of an example of a reciprocating pump. [Figure 4] This is a cross-sectional view showing the main components of an example of a reciprocating pump. [Figure 5] This is an enlarged view of the cross-sectional view shown in Figure 4. [Figure 6] This is a cross-sectional view showing the main parts of a reciprocating pump, which is a reference example for comparison. [Modes for carrying out the invention]

[0015] The following describes a reciprocating pump having an example fluid flow structure, 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 parallel. 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.

[0016] Figure 1 is a perspective view showing the external appearance of an example of a reciprocating pump. Figure 2 is a cross-sectional view of the reciprocating pump cut horizontally. Figure 3 is a cross-sectional view showing one of the main parts of the plunger pump that makes up the reciprocating pump shown in Figure 2. Figure 4 is a cross-sectional view showing the main parts of the reciprocating pump. Figures 2 to 4 show cross-sections along the axis of the plunger pumps that make up the reciprocating pump. Note that the three plunger pumps that make up the reciprocating pump have similar structures to each other. Therefore, in the following description, redundant explanations of the common components of the three plunger pumps will be omitted.

[0017] As shown in FIGS. 1 and 2, the reciprocating pump 1 includes a crank case 10, a mounting member 110 (first member), a manifold unit 130 (second member), and a seal case 160 (third member). The crank case 10 is hollow. Inside the crank case 10, a crankshaft 12, a connecting rod 13 rotatably connected to the crankshaft 12, a piston pin 15 rotatably connecting a plunger rod 41 to the connecting rod 13, etc. are arranged. By these, a drive unit for reciprocally driving a reciprocating member 40 along an axis extending in the X direction is configured. Note that the plunger rod 41 constitutes the latter half of the reciprocating member 40. A plunger 43 that constitutes the first half of the reciprocating member 40 is connected to the front portion of the plunger rod 41. In the illustrated example, three reciprocating members 40 extending in the X direction are arranged in parallel in the Y direction.

[0018] The crank case 10 includes a cylinder portion 11. The cylinder portion 11 is cylindrical and opens toward the front of the crank case 10. The axial direction (X direction) of the cylinder portion 11 is orthogonal to the axial direction (Y direction) of the crankshaft 12. Inside the cylinder portion 11, the piston pin 15 and the tip of the connecting rod 13 can be arranged. In the illustrated example, three cylinder portions 11 are arranged in parallel in the Y direction.

[0019] The inside of the crank case 10 is filled with oil for lubricating and cooling the drive unit. Inside the cylinder portion 11, an oil seal 16 for preventing leakage of the oil in the crank case 10 is arranged. The oil seal 16 is in liquid-tight sliding contact with the outer peripheral surface of the plunger rod 41 that constitutes the reciprocating member 40. Then, as the crankshaft 12 rotates, the reciprocating member 40 reciprocates in the front-rear direction via the connecting rod 13 and the piston pin 15.

[0020] The mounting member 110 is a member for fixing the seal case 160 to the crank case 10. The mounting member 110 is fixed to the front end of the crank case 10. For example, the mounting member 110 may be fixed to the crank case 10 by a fastening member 111 such as a bolt. An example of the mounting member 110 has a substantially rectangular parallelepiped shape or a substantially plate shape and has three through holes 112 at positions corresponding to the three plungers 43. That is, the three through holes 112 penetrating the mounting member 110 in the X direction are formed side by side in the Y direction. Further, the mounting member 110 has three recesses 113 into which the three seal cases 160 are fitted. The three recesses 113 are formed on the front surface of the mounting member 110. The three recesses 113 have the same shape as each other and may have a circular shape as viewed from the X direction in the illustrated example. The three through holes 112 are provided at the centers of the bottom surface portions of the three recesses 113, respectively.

[0021] The manifold unit 130 is arranged at a distance from the mounting member 110 in the X direction. The manifold unit 130 defines a flow path for a fluid (for example, water). An example of the manifold unit 130 includes a manifold 131 and a plurality of valves 140 fixed to the manifold 131. The manifold 131 in the illustrated example has an appearance of a substantially rectangular parallelepiped shape or a substantially plate shape and is fixed to the mounting member 110 by a plurality of bolts 132 via a plurality (eight in the illustrated example) of spacers 115 arranged between the manifold 131 and the mounting member 110.

[0022] The manifold 131 includes a water inlet 133 and a water outlet 134. The water inlet 133 is provided on the left and right side surfaces of the manifold 131 at a position rearward of the center. The water inlet 133 is connected to a suction flow path 135 extending in the left - right direction of the manifold unit 130. The water outlet 134 is provided on the left and right side surfaces of the manifold 13l at a position forward of the center. The water outlet 134 is connected to a discharge flow path 136 extending in the left - right direction of the manifold unit 130.

[0023] Three recesses 137 are formed on the rear end surface of the manifold 131, facing the three recesses 113 of the mounting member 110. Each recess 137 is circular in shape when viewed from the axial direction. The recesses 137 connect the water intake channel 135 and the discharge channel 136 to each other. A valve 140 is housed in the center of each recess 137.

[0024] Valve 140 is a so-called combination valve and, as shown in Figure 3, includes an intake channel 145 and a discharge channel 146. One example of valve 140 includes a body 141, an intake valve 142, and a discharge valve 143. The body 141 includes an intake channel 145 and a discharge channel 146. The intake channel 145 connects the intake channel 135 of the manifold 131 to the internal space S of the seal case 160, which will be described later. The discharge channel 146 connects the internal space S of the seal case 160 to the discharge channel 136 of the manifold 131. The body 141 in the illustrated example has a circular shape when viewed from the axial direction. The discharge channel 146 extends in the axial direction and penetrates the body 141. Multiple intake channels 145 are formed around the discharge channel 146.

[0025] In the main body 141, the opening of the water intake channel 145 facing the internal space S constitutes a water intake valve seat 145a. The water intake valve 142 is held by a cylindrical holder 152 and is biased toward the water intake valve seat 145a by a coil spring 153 located inside the holder 152. Also in the main body 141, the opening of the discharge channel 146 of the main body 141 facing the discharge channel 136 of the manifold 131 constitutes a discharge valve seat 146a. The discharge valve 143 is, for example, spherical and is held by a cylindrical holder 156. The discharge valve 143 is biased toward the discharge valve seat 146a by a coil spring 156a located inside the holder 156.

[0026] The seal case 160 is sandwiched between the mounting member 110 and the manifold unit 130. The seal case 160 includes an internal space S that communicates with the intake channel 145 and the discharge channel 146 of the manifold unit 130. The internal space S of the seal case 160 functions as a pump chamber. The seal case 160 in the illustrated example is substantially cylindrical in shape. The rear end of the seal case 160 is fitted into the recess 113 of the mounting member 110. Multiple sealing members (O-rings) 161 are provided on the outer circumference of the rear end of the seal case 160, and these sealing members 161 seal the space between the outer circumference of the seal case 160 and the mounting member 110.

[0027] An annular projection 162 projecting toward the center is formed on the inner circumferential surface of the seal case 160. The plunger 43 is inserted through the inside of the annular projection 162 and is positioned in the pump chamber formed by the inner space of the seal case 160. The plunger 43 is capable of reciprocating within the internal space S of the seal case 160. A high-pressure sealing member 155 is positioned along the projection 162 on the inner circumference of the seal case 160, and this high-pressure sealing member 155 seals the space between the inner circumference of the seal case 160 and the outer circumference of the plunger 43. A low-pressure sealing member 164 is provided at the rear end of the seal case 160 (behind the projection) to seal the space between it and the plunger 43 at a pressure lower than that of the high-pressure sealing member 155.

[0028] The front end of the seal case 160 is fitted into a circular recess 137 formed in the manifold 131 so as to surround the valve 140. A sealing member (O-ring) 165 is provided on the outer circumference of the front end of the seal case 160, and this sealing member 165 seals the space between the outer circumference of the seal case 160 and the manifold 131.

[0029] The holder 152 of the aforementioned water intake valve 142 is positioned along the inner circumferential surface of the internal space S of the seal case 160. A small-diameter portion 152a with a smaller outer diameter is formed behind the center of the holder 152, and a coil spring 154 is positioned on the outer circumference of this small-diameter portion 152a. That is, the small-diameter portion 152a is located inside the coil spring 154, isolating the coil spring 154 from the internal space S. The holder 152 and the coil spring 154 bias the high-pressure sealing member 155 toward the rear side (convex portion 162).

[0030] In this type of reciprocating pump 1, the rotation of the crankshaft 12 causes the reciprocating member 40, which is connected to the crankshaft 12 via a connecting rod 13 and a piston pin 15, to reciprocate. During the water intake process, the reciprocating member 40 moves backward toward the drive unit, creating negative pressure in the internal space S that constitutes the pump chamber. This negative pressure in the internal space S causes the water intake valve 142 to open and the discharge valve 143 to close. As a result, the liquid to be used is drawn into the internal space S through the water intake passages 135 and 145. On the other hand, during the discharge process, the reciprocating member 40 moves forward toward the manifold 131, pressurizing the internal space S. This pressurization of the internal space S causes the water intake valve 142 to close and the discharge valve 143 to open. As a result, the liquid to be used in the internal space S is discharged to the discharge port 134 through the discharge passages 146 and 136.

[0031] The manifold unit 130 and the seal case 160 will be described further. The manifold unit 130 has a frame-shaped (annular) first inclined surface 149 that is inclined with respect to the clamping direction of the seal case 160, corresponding to each of the multiple seal cases 160. For example, the first inclined surface 149 is formed on each of the multiple valves 140. In the illustrated example, the first inclined surface 149 is formed on the body 141 of the valve 140. The first inclined surface 149 surrounds the opening facing the internal space S of the water intake channel 145 and the discharge channel 146. The first inclined surface 149 is also formed behind the opening in the water intake channel 145 that faces the water intake channel 135. In one example, the water intake channel 135 is formed by the cooperation of the manifold 131 and the seal case 160. In the illustrated example, the front end surface of the seal case 160 that fits into the recess 137 constitutes part of the water intake channel 145.

[0032] The seal case 160 has a frame-shaped (annular) second inclined surface 169 that faces the first inclined surface 149 of the manifold unit 130 and is inclined with respect to the clamping direction of the seal case 160, similar to the first inclined surface 149. For example, the second inclined surface 169 is formed from the inner circumferential surface of the seal case 160 to its front end. That is, the front part of the internal space S of the seal case 160 widens in diameter toward the front end edge.

[0033] Figure 5 is an enlarged view of region R shown in Figure 4. The first inclined surface 149 and the second inclined surface 169 are inclined at a predetermined angle θ with respect to the clamping direction (X direction) of the seal case 160. The inclination angle of the first inclined surface 149 and the inclination angle of the second inclined surface 169 are the same. That is, the first inclined surface 149 and the second inclined surface 169 may be parallel to each other. In one example, the first inclined surface 149 and the second inclined surface 169 are inclined at an angle of 45° with respect to the clamping direction of the seal case 160. Note that the inclination angles of the first inclined surface 149 and the second inclined surface 169 are not limited to 45°, and may be, for example, around 30° to 60°. Furthermore, this inclination angle may be less than 30° or greater than 60°.

[0034] An endless sealing member 171 is positioned between the first inclined surface 149 and the second inclined surface 169. In the illustrated example, since the first inclined surface 149 and the second inclined surface 169 are annular when viewed from the X direction, an O-ring can be used as the sealing member 171. The sealing member 171 seals the space between the first inclined surface 149 and the second inclined surface 169. Since the space between the first inclined surface 149 and the second inclined surface 169 is a gap that can connect the water intake channel 135 and the internal space S, when the internal space S is pressurized in accordance with the operation of the reciprocating pump 1, a force acts to push the sealing member 171 toward the water intake channel 135.

[0035] For example, the seal member 171 is positioned in an annular notched portion 169a formed on the second inclined surface 169. The notched portion 169a may be formed on the second inclined surface 169, which expands toward the manifold unit 130, at a position closer to the mounting member 110 than the center of the seal case 160 in the clamping direction. Therefore, the seal member 171 is positioned between the first inclined surface 149 and the second inclined surface 169, at a position closer to the mounting member 110 than the center of the seal case 160 in the clamping direction. In the illustrated example, the notched portion 169a is formed on the second inclined surface 169 at the position closest to the mounting member 110 (i.e., the innermost position). For example, the notched portion 169a may be defined by a plane parallel to the inner circumferential surface and a plane perpendicular to the inner circumferential surface.

[0036] As described above, one example of a reciprocating pump 1 includes a mounting member 110 fixed to the front end of a crankcase 10 having a plunger 43 that reciprocates in the axial direction, a manifold unit 130 positioned axially spaced apart from the mounting member 110 and defining a fluid flow path, and a plurality of seal cases 160 sandwiched between the mounting member 110 and the manifold unit 130, each containing an internal space S that communicates with the flow path of the manifold unit 130. The plunger 43 is capable of reciprocating within the internal space S of each of the plurality of seal cases 160. The manifold unit 130 has a frame-shaped first inclined surface 149 that is inclined with respect to the clamping direction of the seal case 160, corresponding to each of the plurality of seal cases 160. The seal case 160 has a frame-shaped second inclined surface 169 that faces the first inclined surface 149 of the manifold unit 130 and is inclined with respect to the clamping direction of the seal case 160, similar to the first inclined surface 149. An endless sealing member 171 is positioned between the first inclined surface 149 and the second inclined surface 169.

[0037] In this configuration, the seal case 160 is pressed toward the mounting member 110 by the sealing member 171, and the body 141 of the valve 140 is pressed toward the recess 137 of the manifold 131 by the sealing member 171. In this case, the gap between the first inclined surface 149 and the second inclined surface 169 is determined by the accumulation of the tolerances of each member.

[0038] Let's explain the accumulation of tolerances in more detail. As shown in Figure 4, let A be the depth (distance in the X direction) of the recess 113 of the mounting member 110, B be the depth of the recess 137 of the manifold 131, C be the distance in the X direction from the manifold 131 to the mounting member 110, and D be the length of the seal case 160 in the X direction. In addition, let E be set to reflect the length of the body 141 of the valve 140 in the X direction. For example, length E may be the distance between the contact surface of the body 141 of the valve 140 with the recess 137 of the manifold 131 and the position 149g (see Figure 5) of the first inclined surface 149 that faces the outer edge 169g of the second inclined surface 169 in the axial direction (X direction).

[0039] The depth A of the recess 113 in the mounting member 110, the depth B of the recess 137 in the manifold 131, the axial length D of the seal case 160, and the axial length E of the body 141 of the valve 140 may be different in size among the three plunger pumps because they may include tolerances. In this embodiment, the distance C from the manifold 131 to the mounting member 110 is kept constant by the spacer 115. In this case, the plunger pump with the largest value of D+EAB has the smallest distance between the first inclined surface 149 and the second inclined surface 169, and the smaller the value of D+EAB, the larger the gap between the first inclined surface 149 and the second inclined surface 169. For example, if the maximum value of the depth A of the recess 113 of the mounting member 110 is Amax, the maximum value of the depth B of the recess 137 of the manifold 131 is Bmax, the minimum value of the axial length D of the seal case 160 is Dmin, and the minimum value of the axial length E of the body 141 of the valve 140 is Emin, then the maximum value of the gap size G1 between the first inclined surface 149 and the second inclined surface 169 can be Amax + Bmax + C - Dmin - Emin. Note that the gap size G1 between the first inclined surface 149 and the second inclined surface 169 is the distance of the gap along the axial direction.

[0040] Figure 6 is a cross-sectional view showing the main parts of a reciprocating pump 901, a reference example for comparison with the reciprocating pump 1 according to the present disclosure. The reciprocating pump 901 of the reference example differs from the reciprocating pump 1 according to the present disclosure in that it does not have a first inclined surface 149 and a second inclined surface 169. That is, in the reciprocating pump 901 of the reference example, the valve body 941 does not have a first inclined surface 149, but has a first end face 949 perpendicular to the axial direction. Also, the front end of the seal case 960 does not have a second inclined surface 169, and the front end of the seal case 960 has a second end face 969 perpendicular to the axial direction. The first end face 949 formed on the valve body 941 faces the second end face 969 of the seal case 960. A notched portion is formed on the inner circumference of the second end face 969 of the seal case 960, and a sealing member 971 such as an O-ring is arranged in this notched portion. In the reciprocating pump 901 according to this example, a gap is created between the first end face 949 and the second end face 969 based on the tolerances of each component, similar to the reciprocating pump 1 according to the embodiment of this disclosure. When the internal pressure of the pump chamber increases due to the pump operation, a force is applied in a direction that pushes the seal member 971 into the gap. Therefore, if the gap becomes too large, there is a risk that the seal member 971 may come off the notched portion.

[0041] In the reciprocating pump 1 according to the embodiment of this disclosure, a gap is formed between the first inclined surface 149 and the second inclined surface 169, and the first inclined surface 149 and the second inclined surface 169 are inclined with respect to the clamping direction of the seal case 160 (the X direction in the illustrated example). In this case, the size G2 of the gap in the direction perpendicular to the first inclined surface 149 and the second inclined surface 169 is smaller than the size G1 of the gap in the X direction. More specifically, the size G2 is sinθ times the size G1. In this way, the gap between the first inclined surface 149 and the second inclined surface 169 that clamp the seal member 171 is suppressed from becoming larger, and thus the displacement of the seal member 171 is suppressed.

[0042] The second inclined surface 169 widens toward the manifold unit 130, and the sealing member 171 may be positioned between the first inclined surface 149 and the second inclined surface 169, closer to the mounting member 110 than to the center in the clamping direction of the seal case 160. In this configuration, the circumference of the sealing member 171 can be reduced. This reduces the force exerted on the sealing member 171 by the internal pressure of the pump chamber.

[0043] The first inclined surface 149 and the second inclined surface 169 may be inclined at an angle of 45° with respect to the clamping direction of the seal case 160. In this configuration, the seal member 171 is more easily deformed uniformly, thus suppressing deterioration of the seal member 171.

[0044] The second inclined surface 169 has a notched portion 169a for holding the seal member 171. In particular, the configuration in which the second inclined surface 169 widens toward the manifold unit 130 makes assembly work easier. That is, if the seal case 160 is positioned so that the second inclined surface 169 faces upward and the seal member 171 is set in the notched portion 169a, assembly can be performed simply by placing the valve 140 on the second inclined surface 169.

[0045] The manifold unit 130 includes a manifold 131 and a plurality of valves 140 fixed to the manifold 131. In this configuration, the first inclined surface 149 may be formed on each of the plurality of valves 140. In this case, the tolerances of the plurality of valves are included in the cumulative tolerances described above. That is, problems due to valve tolerances can be mitigated.

[0046] While embodiments of this disclosure have been described above, the specific forms of this disclosure are not limited to the examples described above.

[0047] For example, although an example is shown in which the notched portion 169a is formed on the rearmost side of the second inclined surface 169, the notched portion may be formed on any part of the second inclined surface. For example, the notched portion may be formed in the center of the second inclined surface in the X direction. In this case, the sealing member can be stably held in the notched portion.

[0048] Furthermore, although an example was shown in which the sealing member 171 is held on the second inclined surface 169, the sealing member 171 may also be held on the first inclined surface 149. That is, a notched portion for holding the sealing member 171 may be formed on the first inclined surface 149.

[0049] Although the fluid flow structure constituting a reciprocating pump has been described, the fluid flow structure is not limited to reciprocating pumps and may constitute part of various other pumps or other devices.

[0050] The form of this disclosure may be described as follows: [1] First member (110), A second member (130) is positioned spaced apart from the first member (110) and defines a fluid flow path, The device comprises a plurality of third members (160) sandwiched between the first member (110) and the second member (130), each of which includes an internal space (S) that communicates with the flow path of the second member (130), The second member (130) has a frame-shaped first inclined surface (149) that is inclined with respect to the clamping direction of the third member (160), corresponding to each of the plurality of third members (160). The third member (160) has a frame-shaped second inclined surface (169) facing the first inclined surface (149) of the second member (130), which is inclined with respect to the clamping direction of the third member (160) in the same way as the first inclined surface (149). A fluid flow structure is provided in which an endless sealing member (171) is positioned between the first inclined surface (149) and the second inclined surface (169). [2] The second inclined surface (169) expands toward the second member (130), The fluid flow structure according to [1], wherein the sealing member (171) is positioned between the first inclined surface (149) and the second inclined surface (169) at a position closer to the first member (110) than to the center of the third member (160) in the clamping direction. [3] The fluid flow structure according to [1] or [2], wherein the first inclined surface (149) and the second inclined surface (169) are inclined at an angle of 45° with respect to the clamping direction of the third member (160). [4] The fluid flow structure according to any one of [1] to [3], wherein a notched portion (169a) for holding the sealing member (171) is formed in the second inclined surface (169). [5] A first member (110) is fixed to the front end of a crankcase (10) having a plunger (43) that reciprocates in the axial direction, A second member (130) is positioned spaced apart from the first member (110) in the axial direction and defines a fluid flow path, The device comprises a plurality of third members (160) sandwiched between the first member (110) and the second member (130), each of which includes an internal space (S) that communicates with the flow path of the second member (130), The plunger (43) is capable of reciprocating within the internal space (S) of each of the plurality of third members (160), The second member (130) has a frame-shaped first inclined surface (149) that is inclined with respect to the clamping direction of the third member (160), corresponding to each of the plurality of third members (160). The third member (160) has a frame-shaped second inclined surface (169) facing the first inclined surface (149) of the second member (130), which is inclined with respect to the clamping direction of the third member (160) in the same way as the first inclined surface (149). A reciprocating pump is provided, wherein an endless sealing member (171) is positioned between the first inclined surface (149) and the second inclined surface (169). [6] The second member (130) includes a manifold (131) and a plurality of valves (140) fixed to the manifold (131). The first inclined surface (149) is formed on each of the plurality of valves (140) in the reciprocating pump according to [5]. [Explanation of Symbols]

[0051] 1…Reciprocating pump, 110…Mounting member (first member), 130…Manifold unit (second member), 149…First inclined surface, 160…Seal case (third member), 169…Second inclined surface, 171…Seal member, S…Internal space (pump chamber).

Claims

1. First member (110) and A second member (130) is positioned spaced apart from the first member (110) and defines a fluid flow path, The device comprises a plurality of third members (160) sandwiched between the first member (110) and the second member (130), each of which includes an internal space (S) that communicates with the flow path of the second member (130), The second member (130) has a frame-shaped first inclined surface (149) that is inclined with respect to the clamping direction of the third member (160), corresponding to each of the plurality of third members (160). The third member (160) has a frame-shaped second inclined surface (169) facing the first inclined surface (149) of the second member (130), which is inclined with respect to the clamping direction of the third member (160) in the same way as the first inclined surface (149). An endless sealing member (171) is positioned between the first inclined surface (149) and the second inclined surface (169). The second inclined surface (169) expands toward the second member (130), The sealing member (171) is positioned between the first inclined surface (149) and the second inclined surface (169) at a location closer to the first member (110) than to the center of the third member (160) in the clamping direction, thus forming a fluid flow structure.

2. The fluid flow structure according to claim 1, wherein the first inclined surface (149) and the second inclined surface (169) are inclined at an angle of 45° with respect to the clamping direction of the third member (160).

3. The fluid flow structure according to claim 1 or 2, wherein a notched portion (169a) for holding the sealing member (171) is formed in the second inclined surface (169).

4. A first member (110) is fixed to the front end of a crankcase (10) having a plunger (43) that reciprocates in the axial direction, A second member (130) is positioned spaced apart from the first member (110) in the axial direction and defines a fluid flow path, The device comprises a plurality of third members (160) sandwiched between the first member (110) and the second member (130), each of which includes an internal space (S) that communicates with the flow path of the second member (130), The plunger (43) is capable of reciprocating within the internal space (S) of each of the plurality of third members (160), The second member (130) has a frame-shaped first inclined surface (149) that is inclined with respect to the clamping direction of the third member (160), corresponding to each of the plurality of third members (160). The third member (160) has a frame-shaped second inclined surface (169) facing the first inclined surface (149) of the second member (130), which is inclined with respect to the clamping direction of the third member (160) in the same way as the first inclined surface (149). An endless sealing member (171) is positioned between the first inclined surface (149) and the second inclined surface (169). The second inclined surface (169) expands toward the second member (130), The sealing member (171) is positioned between the first inclined surface (149) and the second inclined surface (169) and closer to the first member (110) than to the center of the third member (160) in the clamping direction, in a reciprocating pump.

5. The second member (130) includes a manifold (131) and a plurality of valves (140) fixed to the manifold (131). The reciprocating pump according to claim 4, wherein the first inclined surface (149) is formed on each of the plurality of valves (140).

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