Reciprocating pump

Abstract

To provide a reciprocation pump adaptable to a plurality of flow channel conditions.SOLUTION: A reciprocation pump includes: a cylinder body 110 including three or more flow passage connection ports 117 communicated to a pump chamber 111; and a valve assembly 120 serving as a suction valve to be connected to any one of the three or more flow passage connection ports 117, the valve assembly 120 and a plug 130 serving as a discharge valve. The three or more flow passage connection ports 117 each have the same shape so as to be capable of being connected to an outlet of the valve assembly 120, an inlet of the valve assembly 120, and the plug 130.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses a reciprocating pump. In this reciprocating pump, each reciprocating member performs a pumping action by reciprocating within a plurality of cylinders arranged in parallel. The reciprocating pump includes a seal case that functions as an independent pressure-resistant container, and a suction valve and a discharge valve that function as independent pressure-resistant containers. A cylinder portion is formed inside the seal case. Valve chambers are formed inside the suction valve and the discharge valve, respectively. The suction valve and the discharge valve are connected so as to sandwich two flat portions from a direction orthogonal to the parallel arrangement direction of the plurality of cylinder portions in a state where the valve chambers communicate with the cylinder portions by abutting against the two flat portions on the outer surface of the small-diameter portion on the tip side formed in the seal case.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The direction of the flow path of the pump can be determined according to conditions such as the conditions of the liquid to be used and the conditions of the installation environment of the pump. For example, depending on the specific gravity of the liquid used, the preferred direction of flow of the liquid may be different. Also, when obstacles are arranged around the pump, it is conceivable that the direction of the flow path is restricted. In the reciprocating pump described in Patent Document 1, it is possible to change the direction of the flow path by changing the connection state so that the positions of the suction valve and the discharge valve are interchanged. However, this pump can only correspond to a flow path from top to bottom and a flow path from bottom to top.

[0005] The purpose of this disclosure is to provide a reciprocating pump that can adapt to multiple flow path conditions. [Means for solving the problem]

[0006] One example of a reciprocating pump is a cylinder body (110) attached to a pump body (10) and having a pump chamber (111) inside, the cylinder body (110) having a cylinder section (113) connected to the pump body (10) and communicating with the pump chamber (111), and three or more flow path connection ports (117) communicating with the pump chamber (111), and an intake valve (120), a discharge valve (120), and a plug (130) connected to any of the three or more flow path connection ports (117), the three or more flow path connection ports (117) all having the same shape so that they can be connected to the outlet of the intake valve (120), the inlet of the discharge valve (120), and the plug (130).

[0007] In the reciprocating pump described above, a cylinder body (110) is connected to the pump body (10), and the outlet of the suction valve (120), the inlet of the discharge valve (120), and the plug (130) are connected to the flow path connection ports (117) of the cylinder body (110). As a result, the liquid supplied from the suction valve (120) by the action of the pump body (10) is sent to the discharge valve (120) via the cylinder body (110) and discharged from the discharge valve (120). Since all of the flow path connection ports (117) provided on the cylinder body (110) have the same shape so that they can be connected to the outlet of the suction valve (120), the inlet of the discharge valve (120), and the plug (130), the location of the flow path connection ports (117) to which the suction valve (120), discharge valve (120), and plug (130) can be arbitrarily determined. By changing the connection positions of the intake valve (120), discharge valve (120), and plug (130), a wider variety of flow paths can be configured compared to conventional designs.

[0008] The outlet of the intake valve (120), the inlet of the discharge valve (120), and the plug (130) are screwed into one of three or more flow path connection ports (117). This configuration makes it easy to realize the connection structure between the intake valve (120), discharge valve (120), plug (130) and the flow path connection ports (117).

[0009] The cylinder body (110) has an end face that contacts the pump body (10), and a notched portion (115) is provided on the periphery of the end face. With this configuration, the cylinder body (110) can be easily removed from the pump body (10).

[0010] The intake valve (120) and the discharge valve (120) are components having the same structure. This configuration reduces the number of different components required for a reciprocating pump.

[0011] The intake valve (120) and discharge valve (120) are formed with marks (126b) that allow the outlet side and inlet side to be identified by their appearance. If the intake valve (120) and discharge valve (120) have the same shape, it is conceivable that the inlet side and outlet side will have the same shape. In this configuration, the inlet side and outlet side can be identified, thus preventing incorrect connection of the intake valve (120) and discharge valve (120).

[0012] The cylinder portion (113) of the cylinder body (110) faces one side in the first direction, and the three or more flow path connection ports (117) are composed of a first flow path connection port (117A) facing the other side in the first direction, a second flow path connection port (117B) facing one side in the second direction intersecting the first direction, and a third flow path connection port (117C) facing the other side in the second direction. When the pump body (10) is placed on a horizontal surface, the first direction is along the vertical direction, and the second direction is along the horizontal direction. In this configuration, in addition to flow paths from top to bottom and flow paths from bottom to top, flow paths from bottom to side, flow paths from side to bottom, flow paths from top to side, and flow paths from side to top can also be configured. [Effects of the Invention]

[0013] Thus, this disclosure provides a reciprocating pump that can adapt to multiple flow path conditions. [Brief explanation of the drawing]

[0014] [Figure 1] This is a perspective view showing an example of a reciprocating pump. [Figure 2] This is a cross-sectional view showing an example of a reciprocating pump. [Figure 3] This is a perspective view showing an example of a cylinder body. [Figure 4] This is a perspective view showing an example of a valve assembly. [Figure 5] This is a perspective view showing an example of an adapter. [Figure 6] This is a perspective view showing an example of a manifold. [Figure 7] This is a cross-sectional view showing an example of a flow path configuration in a reciprocating pump. [Modes for carrying out the invention]

[0015] The following describes an example of a reciprocating pump, referring to the attached drawings. In the following description, "up" and "down" are defined based on the state in which the reciprocating pump is placed 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. In the XYZ Cartesian coordinate system shown in the figures, the X direction (first direction) is along the front-to-back direction, the Y direction is along the left-to-right direction, and the Z direction (second direction) is along the up-and-down direction.

[0016] FIG. 1 is a perspective view showing a reciprocating pump of an example. The reciprocating pump 1 is a so-called horizontal triple plunger pump in which plungers constituting a reciprocating member are arranged in three rows horizontally. FIG. 2 is a cross-sectional view showing one of the three plunger pumps constituting the reciprocating pump. In FIG. 2, a cross-sectional view along the XZ plane in one plunger pump is shown. As shown in FIGS. 1 and 2, the reciprocating pump 1 includes a crank case 10 constituting a pump body and a flow path structure 100 connected to the crank case 10. The reciprocating pump 1 performs a pumping action in a pump chamber provided at the tip of the cylinder part by the reciprocating member 50 reciprocating in the cylinder part.

[0017] The crank case 10 is configured to be hollow. Inside the crank case 10, a crankshaft 15, a connecting rod 17 rotatably connected to the crankshaft 15, a piston pin 18 rotatably connecting a plunger rod 51 to the connecting rod 17, etc. are arranged, and by these, a drive mechanism 19 for reciprocally driving the reciprocating member 50 is constituted.

[0018] The crank case 10 includes a first cylinder 11. The first cylinder 11 has a cylindrical shape 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 Y direction, and the axial direction of the first cylinder 11 is along the X direction. Inside the first cylinder 11, the piston pin 18 and the tip of the connecting rod 17 can be arranged.

[0019] The inside of the crank case 10 is filled with oil for lubrication and cooling of the drive mechanism 19. Therefore, an oil filling port 10a for injecting oil into the inner space and a drain plug 10b for discharging oil are provided in an example of the crank case 10. Further, on the outer surface of the crank case 10, a leg part 10c for placing the reciprocating pump 1 is formed. For example, when the reciprocating pump 1 is placed so that the leg part 10c abuts on a horizontal floor surface, the axial direction of the first cylinder 11 is substantially parallel to the horizontal plane.

[0020] 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 has a substantially columnar shape and is connected to the front end of the plunger rod 51, for example, by bolts.

[0021] A connecting member 21 for connecting the flow path structure 100 is fixed to the front end of the crankcase 10. The connecting member 21 is located in front of the first cylinder 11. The connecting member 21 may be a plate member that extends along the Y and Z directions and has a thickness in the X direction. In an example of the connecting member 21, a hole 21a through which the plunger sleeve 53 in each plunger pump is inserted is formed. The center of the hole 21a coincides with the central axis of the first cylinder 11. Also, a seal packing retainer 60 is disposed between the connecting member 21 and the front end of the first cylinder 11. The seal packing retainer 60 holds a seal packing 61 provided at the front end of the first cylinder 11.

[0022] The flow path structure 100 includes a cylinder body 110, a valve assembly 120, a plug 130, a manifold 140, and an adapter 150. FIG. 3 is a perspective view showing an example of the cylinder body. FIG. 4 is a perspective view showing an example of the valve assembly. FIG. 5 is a perspective view showing an example of the adapter. FIG. 6 is a perspective view showing an example of the manifold.

[0023] The cylinder body 110 corresponds to each of the three plunger pumps. That is, in one example, three cylinder bodies 110 are fixed to the crankcase 10. The cylinder body 110 has a pump chamber 111 inside. For example, the cylinder body 110 has a second cylinder (cylinder portion) 113 that communicates the hole 21a of the connecting member 21 of the crankcase 10 with the pump chamber 111, and three or more flow path connection ports 117 that communicate with the pump chamber 111.

[0024] In the reciprocating pump 1, the second cylinder 113 is positioned axially in front of the first cylinder 11. The reciprocating member 50 reciprocates axially within the first cylinder 11 and the second cylinder 113 via the connecting rod 17 and piston pin 18 as the crankshaft 15 rotates. As the reciprocating member 50 reciprocates within the first cylinder 11 and the second cylinder 113, the pumping action is performed in the pump chamber 111 formed in front of the second cylinder 113.

[0025] The illustrated cylinder body 110 includes a pump chamber portion 112 with a pump chamber 111 formed inside, and a second cylinder 113 that is continuous with the rear surface of the pump chamber portion 112. The second cylinder 113 is formed by a cylindrical connecting passage that communicates with the pump chamber 111. This connecting passage extends in the X direction, and the opening on the side opposite to the pump chamber 111 faces the hole 21a of the connecting member 21. A seal packing retainer 70 is arranged inside the connecting passage. A seal packing 71 and a seal packing 72 are arranged at the front and rear ends of the seal packing retainer 70, respectively.

[0026] The second cylinder 113 in the illustrated example has a rectangular parallelepiped shape and has a flange portion 114 that protrudes vertically from its rear end in the X direction. The flange portion 114 is connected to a connecting member 21 provided at the front end of the crankcase 10. For example, bolt holes 114a are formed in the flange portion 114. The cylinder body 110 is fixed to the connecting member 21 by fastening bolts inserted through the bolt holes 114a to the connecting member 21. Notched portions 115 are formed on the periphery of the end face of the flange portion 114 that abuts against the connecting member 21 (see Figure 1). In the illustrated example, two notched portions 115a are formed at the upper and lower ends of the end face, and one notched portion 115b is formed at the right and left ends of the end face. The notched portions 115 form a gap between the connecting member 21 and the cylinder body 110 when the cylinder body 110 is fixed to the connecting member 21.

[0027] The pump chamber 112 has a rectangular parallelepiped shape and has flow path connection ports 117 on its front, top, and bottom surfaces. The flow path connection ports 117 are openings that communicate with the pump chamber 111 formed inside the pump chamber 112. In the illustrated example, the pump chamber 112 has a first flow path connection port 117A facing forward along the X direction, a second flow path connection port 117B facing upward along the Z direction, and a third flow path connection port 117C facing downward along the Z direction.

[0028] The first flow channel connection port 117A, the second flow channel connection port 117B, and the third flow channel connection port 117C are all the same size and shape. The flow channel connection port 117 in the illustrated example is substantially cylindrical. On the inner circumferential surface of the flow channel connection port 117, the area from the outer end to a predetermined position on the inside is a female threaded portion 117f in which a screw groove is formed. The area further inside from the female threaded portion 117f has an inner diameter smaller than that of the female threaded portion 117f.

[0029] The valve assembly 120 functions as either an intake valve or a discharge valve, depending on its location. An example of the valve assembly 120 includes a valve seat 121, a valve 122 that seals the valve seat 121, a biasing member 123 (compression coil spring) that biases the valve 122 toward the valve seat 121, and a housing that accommodates the biasing member 123 and the valve 122. The housing includes an inlet member 125 that constitutes the inlet side and an outlet member 126 that constitutes the outlet side. The valve seat 121 is formed inside the inlet member 125. The biasing member 123 and the valve 122 are housed inside the outlet member 126. The inner space of the inlet member 125 and the inner space of the outlet member 126 constitute the flow path in the valve assembly 120.

[0030] The inlet-side member 125 and the outlet-side member 126 are integrated by being screwed together. Hexagonal prism-shaped bolt-like portions 125a and 126a are formed on the outer circumferential surfaces of the inlet-side member 125 and the outlet-side member 126, respectively. The valve assembly 120 has marks that allow the outlet side and the inlet side to be identified by their appearance. In the illustrated example, a notched portion 126b is formed on the bolt-like portion 126a of the outlet-side member 126. This allows the user to recognize that the side of the bolt-like portion 126a with the notched portion 126b is the outlet, and the opposite side is the inlet.

[0031] The inlet-side edge of the inlet-side member 125 has a male threaded portion 125c and a sealing portion 125d. The male threaded portion 125c has a cylindrical shape with a threaded outer circumference. The sealing portion 125d is located at the end of the male threaded portion 125c further towards the inlet. The sealing portion 125d has a cylindrical shape. An O-ring 125e is provided on the outer circumference of the sealing portion 125d.

[0032] The outlet-side edge of the outlet-side member 126 has a male threaded portion 126c and a sealing portion 126d. The male threaded portion 126c has a cylindrical shape with a threaded outer circumference. The sealing portion 126d is located at the outlet-side end of the male threaded portion 126c. The sealing portion 126d has a cylindrical shape. An O-ring 126e is provided on the outer circumference of the sealing portion 126d.

[0033] The plug 130 is a component for sealing the flow path connection port 117 of the cylinder body 110. The plug 130 has a male threaded portion 130c and a sealing portion 130d. The male threaded portion 130c has a cylindrical shape with a threaded outer circumference. The sealing portion 130d is located at the end further towards the tip of the male threaded portion 130c. The sealing portion 130d has a cylindrical shape. An O-ring is provided on the outer circumference of the sealing portion 130d.

[0034] The male threaded portion 125c of the inlet-side member 125, the male threaded portion 126c of the outlet-side member 126, and the male threaded portion 130c of the plug 130 are all the same size and shape. Similarly, the sealing portion 125d of the inlet-side member 125, the sealing portion 126d of the outlet-side member 126, and the sealing portion 130d of the plug 130 are all the same size and shape. The threaded grooves formed on the male threaded portions 125c, 126c, and 130c correspond to the threaded grooves (female threaded portion 117f) formed on the flow path connection port 117 of the cylinder body 110. Furthermore, the sealing portions 125d, 126d, and 130d are capable of sealing the inner circumferential surface of the flow path connection port 117 of the cylinder body 110.

[0035] The manifold 140 functions as either a water intake channel or a water discharge channel, depending on the location where it is installed. One example of the manifold 140 has a channel 141 through which liquid flows, an opening 143 communicating with the channel 141 to which the edge of the inlet side member 125 or outlet side member 126 of the valve assembly 120 is connected, and an opening 145 communicating with the channel 141 to which the plug 160 is connected. The illustrated example of the manifold 140 has a rectangular parallelepiped shape with the Y direction as its longitudinal direction, and includes a channel 141 extending in the Y direction.

[0036] In the illustrated example, openings 143 and 145 are formed by one end and the other end of a cylindrical portion 147. Three openings 143 are provided along the Y direction to correspond to three plunger pumps. Therefore, three openings 145 and three cylindrical portions 147 are also provided along the Y direction. The flow path 141 penetrates the manifold 140 in the Y direction so as to connect the three cylindrical portions 147. The cylindrical portions 147 have approximately the same inner diameter as the openings 145. A screw groove for screwing in a plug 160 is formed on the inner circumferential surface of opening 145.

[0037] The inner diameter of the opening 143 is smaller than the inner diameter of the cylindrical portion 147. Therefore, the opening 143 constitutes an inward-facing flange formed on the edge of the cylindrical portion 147. Also, the inner diameter of the opening 143 is larger than the edges of the inlet-side member 125 and the outlet-side member 126 of the valve assembly 120. Therefore, the edges of the inlet-side member 125 and the outlet-side member 126 of the valve assembly 120 can be inserted into the opening 143.

[0038] The adapter 150 is a component for fixing the valve assembly 120 to the manifold 140. The adapter 150 is substantially cylindrical in shape, and a groove 151 for providing an O-ring is formed on the outer circumference of one end. The inner circumference of one end is, for example, a hexagonal prism-shaped flow path 152. On the inner surface of the other end of the adapter 150, a female thread portion 153f is formed, which is the same size and shape as the female thread portion 117f. The region further inside the female thread portion 153f has an inner diameter smaller than the female thread portion 153f. That is, the female thread portion 153f corresponds to the male thread portions 125c and 126c of the valve assembly 120.

[0039] The plug 160 is a component for sealing the opening 145 of the manifold 140. The plug 160 has a male threaded portion 161 and a sealing portion 162. The male threaded portion 161 has a cylindrical shape with a threaded outer circumference. The sealing portion 162 is located at the base end of the male threaded portion 161. An O-ring is provided on the outer circumference of the sealing portion 162. The threads of the male threaded portion 161 correspond to the threads of the opening 145. When the plug 160 is screwed into the opening 145, the outer edge of the opening 145 is sealed by the O-ring of the sealing portion 162. The diameter of the male threaded portion 161 is larger than the diameter of the male threaded portion 130c of the plug 130.

[0040] For example, when fixing the valve assembly 120 to the manifold 140, the inlet or outlet end of the valve assembly 120 is inserted into the opening 153 of the manifold 140. Then, the adapter 150 is screwed onto the end of the valve assembly 120 from the cylindrical portion 147 of the manifold 140. At this time, the adapter 150 may be rotated by a hexagonal wrench inserted into the hexagonal columnar flow path 152. For example, if the inlet member 125 of the valve assembly 120 is inserted into the opening 143, the male threaded portion 125c of the inlet member 125 and the adapter 150 are screwed together. If the outlet member 126 of the valve assembly 120 is inserted into the opening 143, the male threaded portion 126c of the outlet member 126 and the adapter 150 are screwed together.

[0041] As a result, the valve assembly 120 and the adapter 150 are fixed to each other, and the inwardly flange-shaped opening 143 is sandwiched between the valve assembly 120 and the adapter 150. After the valve assembly 120, adapter 150 and manifold 140 are fixed to each other in this way, the opening 145 is sealed by the plug 160.

[0042] In the example shown in Figure 2, the first flow path connection port 117A is sealed with a plug 130. The inlet side of the valve assembly 120 is connected to the second flow path connection port 117B, and the outlet side of the valve assembly 120 is connected to the third flow path connection port 117C. Manifolds 140 are connected to the outlet side of the valve assembly 120 connected to the second flow path connection port 117B, and to the inlet side of the valve assembly 120 connected to the third flow path connection port 117C. In this case, the valve assembly 120 connected to the third flow path connection port 117C functions as an intake valve, and the manifold 140 connected to this valve assembly 120 functions as a water intake manifold. A water intake pipe may be connected to the flow path 141 of the water intake manifold. The valve assembly 120 connected to the second flow path connection port 117B functions as a discharge valve, and the manifold 140 connected to this valve assembly 120 functions as a discharge manifold. A discharge pipe may be connected to the flow path 141 of the discharge manifold.

[0043] In the reciprocating pump 1 described above, the rotation of the crankshaft 15 causes the reciprocating member 50, which is connected to the crankshaft 15 via a connecting rod 17 and a piston pin 18, to reciprocate. During the water intake process, the reciprocating member 50 moves backward toward the drive unit, creating negative pressure in the pump chamber 111. This negative pressure in the pump chamber 111 causes the water intake valve assembly 120 connected to the third flow path connection port 117C to open, and the discharge valve assembly 120 connected to the flow path connection port 17B to close. As a result, the liquid to be used is drawn into the pump chamber 111 through the valve assembly 120 connected to the third flow path connection port 117C. On the other hand, during the discharge process, the reciprocating member 50 moves forward toward the pump chamber 111, pressurizing the pump chamber 111. This pressurization of the pump chamber 111 causes the water intake valve assembly 120 connected to the third flow path connection port 117C to close, and the discharge valve assembly 120 connected to the second flow path connection port 117B to open. As a result, the liquid used in the pump chamber 111 is discharged through the valve assembly 120 connected to the second flow path connection port 117B.

[0044] As described above, one example of a reciprocating pump 1 includes a cylinder body 110 having a cylinder section 113 communicating with a pump chamber 111 and three or more flow path connection ports 117 communicating with the pump chamber 111, and a valve assembly 120 as an intake valve, a valve assembly 120 as a discharge valve, and a plug 130 connected to any of the three or more flow path connection ports 117, and all three or more flow path connection ports 117 have the same shape so that they can be connected to the outlet of the valve assembly 120 as an intake valve, the inlet of the valve assembly 120 as a discharge valve, and the plug.

[0045] In the reciprocating pump 1 described above, a cylinder body 110 is connected to a crankcase 10 which serves as the pump body. The outlet of a valve assembly 120 serving as an intake valve, the inlet of a valve assembly 120 serving as a discharge valve, and a plug 130 are connected to the flow path connection ports 117 of the cylinder body 110. As a result, the liquid supplied from the intake valve by the action of the pump body is sent to the discharge valve via the cylinder body 110 and discharged from the discharge valve. All of the flow path connection ports 117 provided on the cylinder body 110 have the same shape so that they can be connected to the outlet of the intake valve (outlet side member 126), the inlet of the discharge valve (inlet side member 125), and the plug 130. Therefore, it is possible to arbitrarily decide which flow path connection port 117 is formed at which point to connect the valve assembly 120 serving as an intake valve, the valve assembly 120 serving as a discharge valve, and the plug 130. Therefore, by changing the connection positions of the valve assembly 120 as an intake valve, the valve assembly 120 as a discharge valve, and the plug 130, a wider variety of flow paths can be configured compared to conventional designs.

[0046] In one example of a reciprocating pump 1, the three or more flow path connection ports 117 of the cylinder body 110 are configured as a first flow path connection port 117A facing forward along the X direction, a second flow path connection port 117B facing upward along the Z direction, and a third flow path connection port 117C facing downward along the Z direction. Therefore, in the example shown in Figure 2, the outlet side member 126 of the valve assembly 120 is connected to the third flow path connection port 117C, the inlet side member 125 of the valve assembly 120 is connected to the second flow path connection port 117B, and the plug 130 is connected to the first flow path connection port 117A, thereby configuring a flow path from bottom to top.

[0047] Figure 7 also shows another example of connection of the same flow path structure 100. In this example, the outlet side member 126 of the valve assembly 120 is connected to the first flow path connection port 117A, the inlet side member 125 of the valve assembly 120 is connected to the second flow path connection port 117B, and the plug 130 is connected to the third flow path connection port 117C. With these connections, a flow path is formed that extends from the front (side) to the top, as indicated by the arrows in the drawing.

[0048] Similarly, by connecting the outlet side member 126 of the valve assembly 120 to the second flow path connection port 117B, the inlet side member 125 of the valve assembly 120 to the third flow path connection port 117C, and the plug 130 to the first flow path connection port 117A, a flow path is formed that goes from top to bottom. In addition, by connecting the outlet side member 126 of the valve assembly 120 to the first flow path connection port 117A, the inlet side member 125 of the valve assembly 120 to the third flow path connection port 117C, and the plug 130 to the second flow path connection port 117B, a flow path is formed that goes from front to bottom. Furthermore, by connecting the outlet side member 126 of the valve assembly 120 to the second flow path connection port 117B, the inlet side member 125 of the valve assembly 120 to the first flow path connection port 117A, and the plug 130 to the third flow path connection port 117C, a flow path is formed that extends from the top to the front. Additionally, by connecting the outlet side member 126 of the valve assembly 120 to the third flow path connection port 117C, the inlet side member 125 of the valve assembly 120 to the first flow path connection port 117A, and the plug 130 to the second flow path connection port 117B, a flow path is formed that extends from the bottom to the front.

[0049] The outlet of the valve assembly 120, the inlet of the valve assembly 120, and the plug 130 are screwed into one of three or more flow path connection ports 117. This configuration makes it easy to realize a connection structure between the intake valve, discharge valve, and plug and a flow path connection port 117 of the same shape. In one example, the flow path connection port 117 is made of a female thread structure, and the outlet of the valve assembly 120, the inlet of the valve assembly 120, and the plug 130 are made of male thread structures of the same shape to form the connection structure.

[0050] A notched portion 115 is provided on the periphery of the flange portion 114 of the cylinder body 110. With this configuration, the cylinder body 110 can be easily removed from the crankcase 10, which serves as the pump body. For example, the cylinder body 110 can be easily removed by removing the bolts from the bolt holes 114a and inserting a tool into the notched portion 115.

[0051] The suction valve and the discharge valve are valve assemblies 120 having the same structure. This configuration reduces the number of component parts for the reciprocating pump 1. If the structure of the valve assembly for the suction valve and the valve assembly for the discharge valve are to be separate, then the structure of the outlet side of the valve assembly for the suction valve and the structure of the inlet side of the valve assembly for the discharge valve must be such that they can be connected to the flow path connection port 117.

[0052] The valve assembly 120 has a notched portion 126b that allows the outlet side and inlet side to be identified by their appearance. In one example, the use of an intake valve and a discharge valve is distinguished by changing the orientation of a valve assembly 120 of the same shape. In this case, the ability to identify the inlet side and outlet side by their appearance prevents the valve assembly 120 from being connected in the wrong direction.

[0053] Although embodiments of the present invention have been described above, the specific forms of the present invention are not limited to the examples described above.

[0054] For example, although a cylinder body 110 in which the pump chamber 112 and the second cylinder 113 are integrally formed has been illustrated, the pump chamber 112 and the second cylinder 113 may be composed of separate parts.

[0055] Furthermore, although an example has been shown in which the cylinder body 110 is provided with three flow path connection ports 117, the number of flow path connection ports is not particularly limited as long as it is three or more. When increasing the number of flow path connection ports, the size of the pump chamber portion 112 of the cylinder body 110 may be increased. Alternatively, the shape of the pump chamber portion 112 may be made into a polygonal prism shape such as a pentagonal prism, and flow path connection ports 117 and the second cylinder 113 may be provided on each side.

[0056] Embodiments illustrated in this disclosure may be described as follows: [Configuration 1] A cylinder body attached to a pump body and having a pump chamber inside, the cylinder body having a cylinder portion connected to the pump body and communicating with the pump chamber, and three or more flow path connection ports communicating with the pump chamber, It comprises a water intake valve, a discharge valve, and a plug connected to any of the three or more flow path connection ports, A reciprocating pump wherein the three or more flow path connection ports all have the same shape so that they can be connected to the outlet of the suction valve, the inlet of the discharge valve, and the plug. [Configuration 2] The reciprocating pump according to configuration 1, wherein the outlet of the suction valve, the inlet of the discharge valve, and the plug are screwed into any of the three or more flow path connection ports. [Configuration 3] The cylinder body has an end face that contacts the pump body, The reciprocating pump according to configuration 1 or 2, wherein a notched portion is provided on the periphery of the end face. [Structure 4] The reciprocating pump according to any one of the configurations 1 to 3, wherein the suction valve and the discharge valve are components having the same structure as each other. [Composition 5] The reciprocating pump according to configuration 4, wherein the intake valve and the discharge valve have marks formed on them that allow the outlet side and inlet side to be identified by their appearance. [Composition 6] The cylinder portion of the cylinder body is oriented toward one side in the first direction. The three or more flow path connection ports are composed of a first flow path connection port facing the other side of the first direction, a second flow path connection port facing one side of the second direction intersecting the first direction, and a third flow path connection port facing the other side of the second direction. The reciprocating pump according to any one of configurations 1 to 5, wherein, when the pump body is placed on a horizontal surface, the first direction is aligned vertically and the second direction is aligned horizontally. [Explanation of Symbols]

[0057] 1...Reciprocating pump, 10...Cylinder case (main body), 110...Cylinder body, 111...Pump chamber, 113...Second cylinder (cylinder section), 117...Flow path connection port, 120...Valve assembly (suction valve, discharge valve), 130...Plug.

Claims

1. A cylinder body (110) attached to a pump body (10) and having a pump chamber (111) inside, the cylinder body (110) having a cylinder portion (113) connected to the pump body (10) and communicating with the pump chamber (111), and three or more flow path connection ports (117) communicating with the pump chamber (111), The system includes a water intake valve (120), a discharge valve (120), and a plug (130) that are detachably connected to any of the three or more flow path connection ports (117), The three or more flow path connection ports (117) all have the same shape so that they can be connected to the outlet of the water intake valve (120), the inlet of the discharge valve (120), and the plug (130). The cylinder portion (113) of the cylinder body (110) is oriented toward one side in the first direction. The three or more flow path connection ports (117) are composed of a first flow path connection port (117A) facing the other side of the first direction, a second flow path connection port (117B) facing one side of the second direction intersecting the first direction, and a third flow path connection port (117C) facing the other side of the second direction. A reciprocating pump capable of selectively forming a flow path from the first flow path connection port (117A) to the second flow path connection port (117B), a flow path from the first flow path connection port (117A) to the third flow path connection port (117C), a flow path from the second flow path connection port (117B) to the first flow path connection port (117A), a flow path from the second flow path connection port (117B) to the third flow path connection port (117C), a flow path from the third flow path connection port (117C) to the first flow path connection port (117A), and a flow path from the third flow path connection port (117C) to the second flow path connection port (117B).

2. The reciprocating pump according to claim 1, wherein the outlet of the suction valve (120), the inlet of the discharge valve (120), and the plug (130) are screwed into any of the three or more flow path connection ports (117).

3. The cylinder body (110) has an end face that contacts the pump body (10), The reciprocating pump according to claim 1, wherein a notched portion (115) is provided on the periphery of the end face.

4. The reciprocating pump according to any one of claims 1 to 3, wherein the intake valve (120) and the discharge valve (120) are components having the same structure as each other.

5. The reciprocating pump according to claim 4, wherein the intake valve (120) and the discharge valve (120) are formed with marks (126b) that allow the outlet side and inlet side to be identified by their appearance.

6. The reciprocating pump according to claim 1, wherein, when the pump body (10) is placed on a horizontal surface, the first direction is aligned with the vertical direction and the second direction is aligned with the horizontal direction.

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