JP2016217149A - Reciprocation pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reciprocation pump which enables downsizing of a driving part case and achieves downsizing of the reciprocation pump and reduction of manufacturing costs.SOLUTION: A reciprocation pump includes: a water absorption valve 18 which is provided at a front end part of a plunger 14, supplies a liquid to a pump chamber 40 through rearward movement of the plunger 14, and pushes out the liquid in the pump chamber 40 through forward movement of the plunger 14; a crank case 1 which houses a crank shaft 2 and a connecting rod 4 and receives supply of the liquid; and a through hole 13 which is provided at a cross head 8 and supplies the liquid in the crank case 1 to the water absorption valve 18. The liquid lubricates the crank shaft 2 and the connecting rod 4 and then are supplied to the water absorption valve 18 through the through hole 13 of the cross head 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reciprocating pump.

2. Description of the Related Art Conventionally, a reciprocating pump used to lubricate a drive unit that reciprocates a reciprocating member before supplying liquid that is absorbed and discharged by a pump action accompanying the reciprocating motion of the reciprocating member to a pump chamber by a water absorption valve It is known (see, for example, Patent Document 1).
As shown in FIGS. 3 and 4, in this reciprocating pump, the liquid (use liquid) supplied from the water inlet 91 of the crankcase 90 lubricates the crankshaft 92 and the connecting rod 93 as a drive unit, and then the crankcase The oil flows into the water intake valve 95 through an outflow passage 94 provided at 90 and flows into the space behind the high pressure seal 96 to lubricate the high pressure seal 96. A part of the liquid supplied from the water suction port 91 flows into the space behind the high-pressure seal 96 through the communication passage 98 of the piston base 97 connected to the small end portion of the conrot 93.

JP 2013-241888 A

  However, in such a conventional reciprocating pump, since it is necessary to provide the crankcase 90 with an outflow passage 94 that communicates with the water intake valve 95, the crankcase 90 becomes larger. There is a problem that the cost becomes high.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reciprocating pump that can reduce the size of a drive unit case and can reduce the size and manufacturing cost of the reciprocating pump.

  In order to achieve the above object, a reciprocating pump according to the present invention comprises a pump chamber (40), a reciprocating member (8, 14, 62) whose front end reciprocates in the pump chamber (40), Provided at the front end of the reciprocating member (8, 14, 62), the reciprocating motion of the reciprocating member (8, 14, 62) supplies liquid to the pump chamber (40) and the reciprocating member (8 , 14, 62) are connected to a water absorption valve (18, 76) for pushing out the liquid in the pump chamber by a forward movement of the pump chamber and a rear end portion of the reciprocating member (8, 14, 62), and the reciprocating member ( 8, 14 and 62), a drive unit case (1) which houses the drive unit (2, 4) and is supplied with the liquid, and the reciprocating member ( 8), the liquid in the drive case (1) is allowed to flow into the water intake valve (18, 18). 6), and the liquid lubricates the drive section (2, 4), and then the liquid is supplied to the water intake valve (18) through the flow path (13) of the reciprocating member (8). , 76).

  According to such a configuration, since the water absorption valve is provided at the front end portion of the reciprocating member, it is not necessary to separately provide an outflow passage leading to the water absorption valve in the drive unit case, so that the drive unit case can be reduced in size. Therefore, the reciprocating pump can be reduced in size and the manufacturing cost can be reduced.

  In the configuration of the present invention, the reciprocating member (8, 14, 62) is provided in a straight line, and the flow path (13) is along the axis of the reciprocating member (8, 14, 62). Preferably, the water intake valve (18, 76) is formed and supplies liquid to the pump chamber (40) along the axis of the reciprocating member (8, 14, 62).

  If it does in this way, the liquid after the liquid lubricates the drive part flows along the flow path of the reciprocating member formed along the axis of the reciprocating member and is supplied to the water absorbing valve, and is reciprocated by the water absorbing valve. Since it is sent to the pump chamber along the axis of the member, the liquid can be smoothly sent from the drive unit to the pump chamber.

  Moreover, the said structure of this invention WHEREIN: The said water absorption valve (18) is provided in the front-end part of the said reciprocating member (14) so that a movement in the axial direction of the said reciprocating member (14) is possible, and the said reciprocating member ( 14) The sleeve (15) with the flow path (15a) fixed to the rear side of the water intake valve (18) of 14) is blocked by the urging member (19) with the flow path (15a) of the sleeve (15). It is preferable to be biased as described above.

In this way, when the reciprocating member moves forward, the water absorption valve moves in a state of contacting the front end surface of the sleeve and closing the through hole, and the volume of the pump chamber is reduced, so that the liquid in the pump chamber is reduced. Extruded from the pump chamber. At this time, the liquid flows from the flow path of the reciprocating member to the rear side of the advancing water absorption valve and sleeve.
On the other hand, when the reciprocating member moves backward, the front end surface of the sleeve moves away from the water intake valve, and the through hole of the sleeve communicates with the pump chamber, and the volume of the pump chamber increases. Liquid flows into the pump chamber from the side case side.
As described above, during the forward movement and the backward movement of the reciprocating member, the liquid can be continuously flowed from the drive unit case side to the pump chamber.

  Further, in the configuration of the present invention, the water suction valve (76) is formed in an annular shape, and the reciprocating member (62) is a flow provided at a front side and a rear side of the water suction valve (76) with a space therebetween. Between the stopper (65) with the passage (65a) and the valve seat (63), the outer side of the reciprocating member (62) is loosely fitted so as to be movable in the axial direction of the reciprocating member (62). A gap (73) in which the outer peripheral portion of the valve (76) slides on the inner peripheral surface of the pump chamber (40) and allows the liquid to flow between the outer peripheral surface of the reciprocating member (62). The reciprocating member (62) is in contact with the valve seat (63) when the reciprocating member (62) moves forward, and is in contact with the stopper (65) during the backward movement of the reciprocating member (62). (76) The gap (73) and the stopper (65) With road and (65a) is communicated, it is preferable that the gap (77) is formed between the water valve (76) the valve seat (63).

  In this way, when the reciprocating member moves forward, the valve body contacts the stopper and leaves the valve seat. At this time, the gap between the valve element and the reciprocating member and the flow path of the stopper are in communication with each other, and the gap between the valve element and the reciprocating member is between the valve element and the valve seat. Communication with the gap. Then, the liquid that has flowed in through the flow path of the reciprocating member sequentially passes through the gap between the valve body and the valve seat, the gap between the valve body and the reciprocating member, and the flow path of the stopper. Flow into.

On the other hand, when the reciprocating member moves forward, the water absorption valve contacts the valve seat. As a result, the gap between the water absorption valve and the valve seat is eliminated, so that the gap between the water absorption valve and the reciprocating member is closed by the valve seat. Then, the liquid in the pump chamber is pushed out of the pump chamber by the water absorption valve and the valve seat. At this time, liquid flows from the flow path of the reciprocating member to the rear side of the water absorption valve and the valve seat that move forward.
As described above, during the forward movement and the backward movement of the reciprocating member, the liquid can be continuously flowed from the drive unit case side to the pump chamber.

  In addition, the code | symbol in the bracket | parenthesis in the above expresses the corresponding element in drawing for convenience, Therefore, this invention is not limited to description on drawing. The same applies to the description of “Claims”.

  According to the reciprocating pump of the present invention, the drive case can be reduced in size, and the reciprocating pump can be reduced in size and the manufacturing cost can be reduced.

It is a longitudinal section showing the plunger pump concerning a 1st embodiment of the present invention. It is a longitudinal cross-sectional view of the principal part which shows the forced valve type piston pump which concerns on the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the conventional reciprocating pump. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, a first embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 1, the plunger pump (reciprocating pump) according to this embodiment is a multiple-type (in this example, triple-type) plunger pump, and is a metal crankcase (drive case). 1 is provided. A water suction port 1a is provided at the center of the upper wall of the crankcase 1, and a liquid (use liquid) is supplied and absorbed from the water suction port 1a. A flange 1b for attaching the pump to a drive source such as a motor is formed on one side surface of the crankcase 1.

  A crankshaft (drive unit) 2 is rotatably supported in the crankcase 1, and three crankpins 3 are formed on the crankshaft 2 at a predetermined interval. The water inlet 1 a is located substantially directly above the center of the crankshaft 2, that is, approximately above the center crankpin 3. A large end 5 of a connecting rod (drive unit) 4 is rotatably fitted to each crank pin 3 via a bearing 6 made of a high-strength water-resistant resin or the like. Further, a rear end portion of a cross head (reciprocating member) 8 is connected to a small end portion 7 of each connecting rod (connecting rod) 4 by a cross pin 9. Between the cross head 8 and the cross pin 9, a bearing 10 made of a high strength water resistant resin or the like is interposed.

  Each crosshead 8 is slidably fitted into a cylindrical guide portion 1c of the crankcase 1. The guide portion 1 c is formed in a cylindrical shape that is open on both sides, and extends in a direction perpendicular to the crankshaft 2. A bearing 12 made of a high-strength water-resistant resin or the like is interposed between the cross head 8 and the guide portion 1c. The cross head 8 is formed with a plurality of through holes (flow paths) 13 extending in the axial direction of the black head 8. At the center of the front end of each cross head 8, a plunger (reciprocating member) 14 that extends forward with the axis of the cross head 8 aligned with the axis is provided.

A lotus root-like sleeve 15 and a stepped collar 16 are inserted in order from the rear end side toward the front end side on the outside of the front end portion formed in the small diameter of the plunger 14, and these are the front end portion of the plunger 14. By being tightened by the nut 17 screwed into the nut 14, it is sandwiched between the stepped portion of the plunger 14 and the nut 17, thereby being detachably fixed to the plunger 14. A water absorption valve 18 is fitted on the outside of the small diameter portion of the stepped collar 16 so as to be movable in the axial direction of the plunger 14, and the water absorption valve 18 is penetrated by the sleeve 15 by a spring (biasing member) 19. It is urged toward the sleeve 15 so as to close the hole (flow path) 15a.
Disposed on the front side of each plunger 14 is a discharge valve 23 that is biased by a spring 22 to the valve seat 21 so as to face the plunger 14.

A cylindrical seal case 32 is fitted in front of the bearing 12 of the crankcase 1. An annular flange 32 a that protrudes radially outward is formed at the front end of the seal case 31. The flange 32 a abuts against the front end surface of the crankcase 1, so that the axial direction of the seal case 32 Is positioned. The axial position of the bearing 12 is fixed between the seal case 32 and the stepped portion of the crankcase 1.
In addition, an annular wall portion 32b protruding radially inward is provided at the rear end portion of the seal case 32. The sleeve 15 is inserted through the inside of the wall portion 32b, and a front side of the wall portion 32b is provided. A seal (high pressure seal) 35 is abutted on the surface and is mounted in the seal case 32. The outer peripheral surface of the sleeve 15 is in sliding contact with the inner peripheral surface of the seal 35.

One end of a cylinder 36 is fitted into each seal case 32, and the other end of the cylinder 36 is fitted into a manifold 37. The manifold 37 is fastened to the crankcase 1 by a plurality of bolts 39 screwed into the crankcase 1, whereby the crankcase 1, the seal case 31, the cylinder 36 and the manifold 37 are fixed to each other in this order.
Inside the cylinder 36 is a pump chamber 40.

The position of the seal 35 in the axial direction is fixed by being sandwiched between one end face of the cylinder 36 and the wall 32b of the seal case 32.
The valve seat 21, the spring 22, and the discharge valve 23 are provided in the manifold 37. The valve seat 21 has a flange portion sandwiched between the other end surface of the cylinder 36 and the inner surface of the manifold 37, so that the manifold 37 is fixed.
Reference numerals 52, 53, and 54 are O-rings for keeping liquid-tight.

  In the plunger pump configured as described above, the liquid (use liquid) is supplied into the crankcase 1 from the water suction port 1a in the crankcase 1, and the drive parts such as the crankshaft 2 and the connecting rod 4 are bathed in the liquid. This drive unit is driven by a drive source such as a motor. Then, the crankshaft 2 rotates, and this rotational motion is converted into a reciprocating motion through the connecting rod 4 so that the reciprocating members such as the crosshead 8 and the plunger 14 reciprocate.

When the plunger 14 moves back and forth (reciprocating) in the pump chamber 40, the liquid flows into the pump chamber 40 from the water intake valve 18 due to a change in volume of the pump chamber 40 and is discharged from the discharge valve 23.
That is, when the plunger 14 moves forward toward the discharge valve 23, the water absorption valve 18 moves in a state where it contacts the front end surface of the sleeve 15 and closes the through hole 15a, and the volume of the pump chamber 40 is reduced. The liquid in the pump chamber 40 is discharged from the discharge valve 23. At this time, liquid flows from the through hole 13 of the crosshead 8 to the rear side of the water absorption valve 18 and the sleeve 15 that advance.

  On the other hand, when the plunger 14 moves backward in the direction away from the discharge valve 23, the front end surface of the sleeve 15 is separated from the water intake valve 18, whereby the through hole 15 a of the sleeve 15 and the pump chamber 40 communicate with each other. Since the volume increases, the liquid flows into the pump chamber 40 from the crankcase 1 side through the through hole 15 a of the sleeve 15.

When the pump chamber 40 is depressurized by such a pump action, the liquid flows into the crankcase 1 from the water inlet 1a toward the crankshaft 2 as shown by arrows in FIG. It goes around to the rear side, goes to the lower side of the crankshaft 2, and further flows into the guide portion 1c. A part of the liquid flowing in from the water suction port 1a flows from the upper side of the crankshaft 2 to the front side and flows into the guide portion 1c. Then, the liquid that has flowed into the guide portion 1 c flows into the through hole 15 a of the sleeve 15 through the through hole 13 of the cross head 8.
At this time, the liquid is supplied to the bearings 6, 10, 12 made of high strength water resistant resin or the like. The liquid is also supplied to the back side of the seal 35.

  In this plunger pump, the liquid supplied into the crankcase 1 from the water inlet 1c of the crankcase 1 is driven by reciprocating members such as the crankshaft 2 and the connecting rod 4; the crosshead 8 and the plunger 14; Furthermore, since each part of the water intake valve 18 flows to the pump chamber 40, the bearings 6, 10, 12 of the drive part and the reciprocating member part can be sufficiently cooled and lubricated without using oil. The liquid can also be supplied to the back side of the seal 35, and the seal 35 can be sufficiently cooled and lubricated.

  Further, the front end of the plunger 14 is provided with a water absorption valve 18 that supplies liquid to the pump chamber 40 by the backward movement of the plunger 14 and pushes out the liquid in the pump chamber 40 by the forward movement of the plunger 14. The liquid inside passes through the through hole 13 of the crosshead 8 and further passes through the water absorption valve 18 to be supplied to the pump chamber 40. For this reason, it is not necessary to separately provide an outflow passage in the crankcase 1 and it is not necessary to provide an inflow port in the manifold 37. Therefore, the crankcase 1 and the manifold 37 can be downsized. Therefore, it is possible to reduce the size of the pump and reduce the manufacturing cost.

  Further, since the through hole 13 of the cross head 8 and the through hole 15a of the sleeve 15 are formed forward and backward and along the axis of the cross head 8 / plunger 14, the sleeve passes through the through hole 13 of the cross head 8. The fluid flows smoothly into the 15 through holes 15a.

  Further, as described above, the water suction valve 18 cooperates with the sleeve 15 with the through hole 15a to continuously flow liquid from the crosshead 8 side to the pump chamber 40 during the forward and backward movement of the reciprocating member. Therefore, the liquid can be supplied from the crankcase 1 to the pump chamber 40 more smoothly.

Next, a second embodiment of the present invention will be described with reference to FIG.
Note that the forced valve piston pump (reciprocating pump) according to this embodiment differs from the plunger pump according to the first embodiment in the structure of the water intake valve portion and eliminates the need for a seal (high pressure seal). However, since the other structures are the same, description of other parts is omitted or simplified.

  As shown in FIG. 2 and FIG. 1 (see if necessary), the piston rod (reciprocating member) 62 is provided at the center of the front end of the crosshead 8 and aligns the axis of the crosshead 8 with that axis. It extends to the front side. A valve seat 63, a collar 64, and a stopper 65 are fitted on the outer periphery of the front end portion of the piston rod 62 in order from the rear side. A portion of the piston rod 62 on the front side of the stopper 65 is formed with a female screw. When a nut 67 is tightened to the female screw via a washer 68, the valve seat 63, the collar 64, and the stopper 65 are connected to the piston rod 62. And is fixed between the stepped portion and the washer 68.

  An annular valve body 72 is loosely fitted on the outside of the collar 64 between the valve seat 63 and the stopper 65, and a gap 73 is formed between the valve body 72 and the collar 64. Yes. A piston packing 74 is mounted on the outer periphery of the valve body 72, and the piston packing 74 slides on the inner peripheral surface of the cylinder 75 (the inner peripheral surface of the pump chamber 40). The length of the valve body 72 is set to be shorter than the distance between the valve seat 63 and the stopper 65, and when the valve body 72 comes into contact with the stopper 65, the length between the valve body 72 and the valve seat 63 is set. A gap 77 is formed. The stopper 65 is formed with a through hole (flow path) 65 a, and when the valve body 72 contacts the stopper 65, the through hole 65 a communicates with the gap 73 between the valve body 72 and the collar 64. It is like that. The valve body 72 and the piston packing 74 constitute a water absorption valve 76.

  In this forced valve type piston pump, it is not necessary to provide the seal case 32 and the seal (high pressure seal) 35. That is, the cylinder 75 is formed in a cylindrical shape, and one end portion of the cylinder 75 is fitted in front of the bearing 12 of the crankcase 1, and one end surface thereof is in contact with the stepped portion of the crankcase 1, On the other hand, the other end of the cylinder 75 is fitted into the manifold 37, and the other end surface is brought into contact with the valve seat 21 in the manifold 37. The manifold 37 is fastened to the crankcase 1 by bolts 39, so that the crankcase 1, the cylinder 75, and the manifold 37 are fixed to each other in this order. The axial position of the bearing 12 is fixed between the cylinder 75 and the stepped portion of the crankcase 1. Note that O-rings 53 and 54 are mounted on the outer peripheral surface of the cylinder 75 in the same manner as the cylinder 36.

  In the forced valve type piston pump (uniflow pump) configured as described above, when the piston rod 62 advances and retreats (reciprocates) in the pump chamber 40, the liquid is transferred from the water intake valve 76 to the pump chamber 40 by the volume change of the pump chamber 40. It flows in and is discharged from the discharge valve 23 to function as a pump.

  That is, when the piston rod 62 moves backward in the water absorption process, the front end portion of the piston rod 62 moves backward in the pump chamber 40, whereby the valve body 72 contacts the stopper 65 as shown in FIG. At the same time, the valve seat 63 is separated. At this time, the gap 73 between the valve body 72 and the collar 64 and the through hole 65a of the stopper 65 communicate with each other, and the gap 77 between the gap 73, the valve body 72, and the valve seat 63 communicates. To do. If it does so, the liquid which flowed in through the through-hole 13 of the guide part 1c and the crosshead 8 will be the clearance gap 77 between the valve body 72 and the valve seat 63, the clearance gap 73 between the valve body 72 and the collar 64, and a stopper. The air passes through the 65 through holes 65a in order, and flows into the pump chamber 40 (the front side of the piston packing 74).

On the other hand, when the piston rod 62 moves forward in the discharge process, the front end of the piston rod 62 moves forward in the pump chamber 40, whereby the valve body 72 contacts the valve seat 63. As a result, the gap 77 between the valve body 72 and the valve seat 63 disappears, so that the gap 73 between the valve body 72 and the collar 64 is closed by the valve seat 63. Then, the liquid in the pump chamber 40 is pushed out of the pump chamber 40 by the valve body 72, the piston packing 74 attached to the valve body 72 and the valve seat 63, and discharged from the discharge valve 21. At this time, liquid flows from the through-hole 13 of the crosshead 8 to the rear side of the water absorption valve 76 (the valve body 72 and the piston packing 74) and the valve seat 63 that move forward.
Other operations are the same as those in the first embodiment.

  In this forced valve piston pump, the liquid supplied into the crankcase 1 from the water inlet 1c of the crankcase 1 is supplied to the crankshaft 2, the connecting rod 4 and other driving parts, the crosshead 8 and the piston rod 62, etc. Since it flows through the reciprocating member and further each part of the water intake valve 76 to the pump chamber 40, the bearings 6, 10, and 12 of the driving portion and the reciprocating member are sufficiently cooled and lubricated without using oil. In addition, liquid can be supplied to the back side of the seal 35, and the seal 35 can be sufficiently cooled and lubricated.

  Furthermore, a water absorption valve 76 is provided at the front end of the piston rod 62 to supply liquid to the pump chamber 40 by the backward movement of the piston rod 62 and push out the liquid of the pump chamber 40 by the forward movement of the piston rod 62. The liquid in the crankcase 1 passes through the through hole 13 of the crosshead 8 and is further supplied to the pump chamber 40 through the water absorption valve 76. For this reason, it is not necessary to separately provide an outflow passage in the crankcase 1 and it is not necessary to provide an inflow port in the manifold 37. Therefore, the crankcase 1 and the manifold 37 can be downsized. Therefore, it is possible to reduce the size of the pump and reduce the manufacturing cost.

  Further, since the through hole 13 of the cross head 8 and the flow path of the water intake valve 76 are formed in front and back and along the axis of the cross head 8 and the piston rod 62, the through hole 13 of the cross head 8 passes through the through hole 13. The fluid can smoothly flow into the flow path of the water absorption valve 76.

  Further, as described above, the water suction valve 76 cooperates with the valve seat 63 and the stopper 65 with the through hole 65a to continuously supply liquid from the crosshead 8 side to the pump chamber 40 during the forward and backward movement of the reciprocating member. Therefore, the liquid can be supplied more smoothly from the crankcase 1 to the pump chamber 40.

1 Crankcase (drive case)
2 Crankshaft (drive unit)
4 Connecting rod (drive unit)
8 Crosshead (reciprocating member)
13 Through hole (flow path)
14 Plunger (reciprocating member)
15 Sleeve 15a Through hole (flow path)
18 Water absorption valve 19 Spring (biasing member)
40 Pump chamber 62 Piston rod (reciprocating member)
73 Clearance 76 Water absorption valve 77 Clearance 63 Valve seat 65 Stopper 65a Through hole (flow path)

Claims (4)

A pump chamber (40);
A reciprocating member (8, 14, 62) whose front end reciprocates in the pump chamber (40);
Provided at the front end of the reciprocating member (8, 14, 62), supplies the liquid to the pump chamber (40) by the reciprocating motion of the reciprocating member (8, 14, 62), and the reciprocating member ( A water intake valve (18, 76) that pushes out the liquid in the pump chamber by a forward movement of 8, 14, 62);
A drive unit (2, 4) connected to a rear end of the reciprocating member (8, 14, 62) and reciprocating the reciprocating member (8, 14, 62);
A drive unit case (1) that houses the drive unit (2, 4) and is supplied with the liquid;
A flow path (13) provided in the reciprocating member (8) and supplying the liquid in the drive case (1) to the water absorption valve (18, 76);
The liquid is supplied to the water intake valve (18, 76) through the flow path (13) of the reciprocating member (8) after lubricating the drive part (2, 4). . The reciprocating members (8, 14, 62) are provided in a straight line,
The flow path (13) is formed along the axis of the reciprocating member (8, 14, 62),
The said water intake valve (18, 76) supplies a liquid to the said pump chamber (40) along the axis line of the said reciprocating member (8, 14, 62), The Claim 1 characterized by the above-mentioned. Reciprocating pump. The water intake valve (18)
Provided at the front end of the reciprocating member (14) so as to be movable in the axial direction of the reciprocating member (14);
To the sleeve (15) with a flow path (15a) fixed to the rear side of the water absorption valve (18) of the reciprocating member (14), the flow path of the sleeve (15) is applied by a biasing member (19). The reciprocating pump according to claim 1 or 2, wherein the reciprocating pump is biased so as to block (15a). The water intake valve (76)
Formed in a ring,
The reciprocating member (62) is reciprocated between a stopper (65) with a flow path (65a) and a valve seat (63) provided on the front side and the rear side of the water intake valve (76) with a space therebetween. Loosely fitted on the outside of the moving member (62) so as to be movable in the axial direction of the reciprocating member (62);
The outer peripheral portion of the water intake valve (76) slides on the inner peripheral surface of the pump chamber (40) and allows the liquid to flow between the outer peripheral surface of the reciprocating member (62) ( 73),
When the reciprocating member (62) moves forward, it contacts the valve seat (63), while when the reciprocating member (62) moves backward, it contacts the stopper (65), and the water intake valve (76) The gap (73) communicates with the flow path (65a) of the stopper (65), and a gap (77) is formed between the water intake valve (76) and the valve seat (63). The reciprocating pump according to claim 1 or 2, wherein

Images