JPH022947Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention alternately supplies air pressure as a driving source to the upper and lower sides of the driving side piston using a switching valve, and as the driving side piston is displaced, the pump side piston is The present invention relates to a pump device for reciprocating displacement.

BACKGROUND ART Conventionally, as a simple pump device operated by supplying air pressure, there is one disclosed, for example, in Japanese Utility Model Publication No. 35-33554. The pump device disclosed in this publication has a configuration in which a driving piston in an air cylinder reciprocates when air pressure is supplied, and the piston in the pump cylinder reciprocates through a cylindrical rod together with the driving piston to pump fluid. It is becoming. The driving piston of this pump device is provided with an intake passage that supplies the air pressure supplied to the lower chamber of the air cylinder to the upper chamber side, and an exhaust passage that exhausts the air from the upper chamber to the exhaust hole of the rod. There is. and,
A first valve body for opening and closing the exhaust passage is provided above the drive-side piston, a second valve body for opening and closing the intake passage is provided below the drive-side piston, and the first valve body and the second valve body are integrally connected by a connecting pin passing through the intake passage.

Therefore, when the drive-side piston moves upward to the upper end of the cylinder due to the supply of air pressure, the first valve body contacts the spring member at the upper end to close the exhaust passage, and at the same time the second valve body, which is integral with the first valve body, closes the exhaust passage. The valve body opens the intake passage. When the driving piston moves down to the lower end of the cylinder, the second valve element contacts the spring member at the lower end to close the intake passage, and at the same time, the first valve element opens the exhaust passage. By repeating this process, the drive side piston reciprocates, and the pump side piston is driven.

Problems to be Solved by the Invention However, in conventional pump devices, a connecting pin that connects the first valve body and the second valve body is loosely fitted in the intake passage, and furthermore, the upper chamber and the lower chamber are connected to each other. Since the wire diameter at the end of the spring member provided in the valve is reduced and becomes thinner toward the tip, the spring force may be biased depending on the contact with the spring member, causing the first and second valve bodies to tilt. I had a problem.

Moreover, in conventional pump devices, the first and second valve bodies are integrally provided, so if one valve body tilts, the other valve body also tilts, resulting in communication between the intake passage and the exhaust passage. Therefore, the supplied air passes through the intake passage and the exhaust passage and is exhausted from the exhaust hole as it is, resulting in a problem that the drive-side piston does not operate at all.

Therefore, an object of the present invention is to provide a pump device that solves the above problems.

Means and Effects for Solving the Problems The present invention divides the inside of the pump drive side cylinder, which is supplied with air pressure as a pump drive source, into an upper chamber and a lower chamber, and directs the air pressure from the lower chamber to the upper chamber. A pump driving side piston having an intake passage for supplying air pressure and an exhaust passage for discharging air pressure from the upper chamber, and a first and second a switching valve that contacts a spring member and thereby alternately closes the intake passage and the exhaust passage;
One side is provided with the pump drive side piston, and the other side is provided with a pump side piston that reciprocates within the pump side cylinder, and the exhaust passage communicates with the atmosphere between the pump drive side piston and the pump side piston. The pump device includes a pump driving rod having an exhaust hole, and the switching valve opens the exhaust passage on the upper chamber side when the pump driving side piston is displaced toward the upper chamber side, and the switching valve opens the exhaust passage on the upper chamber side, and a first valve element that closes the exhaust passage on the upper chamber side when the side piston is displaced toward the lower chamber; and a first valve element that is integrally connected to the first valve element via a coupling member and is connected to the pump drive side. a first spring bearing member that contacts a first spring member in the upper chamber to close the first valve body when the piston is displaced toward the upper chamber side end; and a first spring bearing member that is slidable on the coupling member. mated to,
a second spring bearing member interposed between the first valve body and the first spring bearing member; and a second spring bearing member compressed between the first spring bearing member and the second spring bearing member. The spring member No. 3 is integrally connected to the second spring receiving member via a connecting member passing through the intake passage, and when the pump drive side piston is displaced to the upper chamber side end, the second spring member When the receiving member contacts the first spring receiving member and opens the intake passage on the lower chamber side, and when the pump driving side piston is displaced to the lower chamber side end, the second spring member in the lower chamber The first valve element contacts the intake passage and closes the intake passage, and the first valve element opens and closes the exhaust passage, and the second valve element opens and closes the intake passage. Even if the valve body tilts, the other valve bodies do not tilt and maintain the closed state, thereby preventing malfunction of the drive-side piston.

Example Next, one example will be described. FIG. 1 shows an embodiment of the pump device according to the present invention. In FIG. 1, reference numeral 1 denotes an air motor main body, which has a pneumatic supply port 3 connected to a pneumatic pipe 2, and is supplied with pneumatic pressure as a driving source through the pneumatic pipe 2. 4 is an air cylinder whose lower side is screwed into the air motor main body 1 and whose upper opening is closed by a cap 5. Reference numeral 6 denotes a rubber air piston (pump driving side piston), which has a central exhaust passage 6a and a plurality of intake passages 6b outside the exhaust passage 6a, as shown in an enlarged view in FIG. The peripheral edge 6c of the air cylinder 4 is brought into sliding contact with the inner circumferential surface 4a of the air cylinder 4, thereby defining the inside of the air cylinder 4 into an upper chamber 4b and a lower chamber 4c. Valve seats 6d and 6e protrude annularly from the peripheries of the exhaust passage 6a and the intake passage 6b. Moreover, the air piston 6 is attached so as to cover the flange portion 7a of the attachment member 7 by both sides. A small hole 7b corresponding to the intake passage 6b of the air piston 6 is bored in the flange 7a of the mounting member 7, and the intake passage 6b communicates the upper chamber 4b and the lower chamber 4c via the small hole 7b. ing.

As shown in FIG. 2, the air piston 6 is provided with a switching valve 8 that alternately supplies air pressure to the upper chamber 4b and the lower chamber 4c. The switching valve 8 includes an upper valve body (first valve body) 9 that closes the exhaust passage 6a on the upper chamber 4b side;
The lower valve body (second valve body) 10 closes the intake passage 6b on the side of the lower chamber 4c.

The upper valve body 9 is integrally attached by inserting the lower end 11a of the mounting screw 11 into the center hole 9a and caulking it. Reference numeral 12 designates an upper spring receiving part (first spring receiving member), the outer peripheral part 12a of which is bent downward;
It is inserted into the upper end threaded portion 11b of the mounting screw 11 and is tightened and fixed with a nut 13.

The lower valve body 10 is an annular plate facing the valve seat 6e, and has a plurality of connecting pins 1 passing through the intake passage 6b.
4, a lower spring receiving plate 15 (second spring receiving member) is integrally fixed thereto. Lower spring receiving plate 1
A coil spring (third spring member) 16 is interposed between the coil spring 5 and the upper spring receiving portion 12 in a compressed state. The lower spring receiving plate 15 has a center hole 15a through which the mounting screw 11 is inserted, and is provided to be interposed between the spring 16 and the upper valve body 9.

Therefore, the spring 16 presses and biases the upper spring receiving part 12 in the direction of _arrow ing. Therefore, the upper valve body 9 is
6 to maintain a horizontal state.

Note that the connecting pin 14 has a smaller diameter and is longer than the exhaust passage 6b, so when the upper valve body 9 is blocking the exhaust passage 6a, the lower valve body 10 is pushed down in the direction of arrow _X2 to be separated from the valve seat 6e. The intake passage 6b is opened. Further, when the lower valve body 10 closes the intake passage 6b, the upper valve body 9 moves away from the valve seat 6d and opens the exhaust passage 6a. Therefore, the switching valve 8
As will be described later, the upper valve body 9 and the lower valve body 10 repeat opening and closing alternately, thereby supplying air pressure to the upper chamber 4b and lower chamber 4c to move the air piston 6 as indicated by the arrows X ₁ ,
X Drive back and forth in _two directions.

Reference numeral 17 denotes a pump driving rod, which has a hollow cylindrical shape, and has an exhaust hole 18 opened to the atmosphere at a central portion 17a that protrudes from the air motor main body 1. A mounting member 7 is screwed onto the upper end of the rod 17, and the air piston 6 is attached to the rod 1 by the mounting member 7.
It is attached to 7. The outer periphery of the rod 17 and the air motor body 1 are hermetically sealed by an O-ring 19, so that no air pressure leaks from the outer periphery of the rod 17. Reference numeral 20 denotes a coil spring (first spring member) on the upper chamber side, which is locked inside the cap 5 opposite to the upper spring receiver 12, and when the air piston 6 moves upward, the upper spring is activated as described later. Receiving part 1
2. 21 is the coil spring (second
A spring member) is wound around the outer periphery of the rod 17 and fixed to the air motor main body 1 facing the lower valve element 10, and comes into contact with the lower valve element 10 when the air piston 6 moves downward. A regulator 22 is disposed in the middle of the pneumatic piping 2 and controls the pneumatic pressure supplied to the air motor main body 1 to a predetermined pressure.

Reference numeral 23 denotes a pump main body, which has a discharge port 23a for discharging fluid, and is integrally connected to the air motor main body 1 via a connecting portion 24. Reference numeral 25 designates a pump-side cylinder, the upper side of which is screwed into the pump body 23, and the foot valve 26 attached to the lower side.
The foot valve 26 connects the fluid flow path 26 to the check valve chamber 26b.
The valve is closed by the ball 27 inside and functions as a check valve. Reference numeral 28 denotes a ball stopper, which has a rod shape, for example, and is suspended horizontally at the upper opening of the check valve chamber 26b, and prevents the ball 27 from leaving the check valve chamber 26b. A pipe 30 from a tank 29 is connected to the flow path 26a, and the fluid in the tank 29 flows into the cylinder 25 through the pipe 30 and the flow path 26a, pushing up the ball 27.

31 is a piston on the pump side, which has a center hole 31a and a plurality of flow passages 31b on the outside of the center hole 31a, and has an outer circumferential edge 31c in sliding contact with the inner circumferential surface of the cylinder 25 to move the inside of the cylinder 25. It is divided into an upper chamber 25a and a lower chamber 25b. Further, the piston 31 is inserted through the center hole 31a into the shaft portion 17b at the lower end of the rod 17, and is mounted so as to be freely displaceable in the directions of arrows _X1 and _X2 . 32 is a valve body, which connects the flow path 31 of the piston 31.
The valve seat 31d faces the valve seat 31d, and is fixed to the lower end of the rod 17 with a nut 33. Therefore, the piston 31 is provided so as to be displaceable between the stepped portion 17c of the rod 17 and the valve body 32 along the shaft portion 17b. 34 is a V-packet that airtightly seals between the pump body 23 and the outer periphery of the rod 17.

Next, the operation of the pump device having the above structure will be explained.

Air pressure is adjusted to a predetermined pressure by a regulator 22, and is supplied into the air motor main body 1 from an air pressure supply port 3 through a pneumatic pipe 2. As shown in FIG. 2, the switching valve 8 is pushed in the direction of arrow _X1 by air pressure supply, so the lower valve body 10 closes the intake passage 6b of the piston 6, and the upper valve body 9 closes the exhaust passage 6a. Open the door. For this reason, the upper chamber 4b of the air cylinder 4
The inside is communicated with the exhaust hole 18 and the lower chamber 4c is at atmospheric pressure.
The inside becomes air pressure, and this differential pressure causes the air piston 6
is displaced in the direction of arrow _X1 while discharging the air in the upper chamber 4b from the exhaust hole 18.

The rod 17 is displaced together with the air piston 6, causing the pump-side valve body 32 to come into contact with the valve seat 31d of the piston 31, thereby displacing the piston 31 in the direction of arrow _X1 while keeping the valve closed. With the displacement of the piston 31, the fluid in the upper chamber 25a of the cylinder 25 is forced into another container 36 from the discharge port 23a via the piping 35,
At the same time, negative pressure is generated in the lower chamber 25b, the ball 27 is unseated, the flow path 26a is opened, and the fluid in the tank 29 is sucked into the lower chamber 25b of the cylinder 25.

When the air piston 6 is further displaced in the direction of arrow _X1 , the upper spring receiving portion 12 of the switching valve 8 comes into contact with the spring 20, as shown in FIG. As the air piston 6 moves upward in the direction of _arrow
X Displaced in _two directions. The upper spring receiving part 12 is the spring 1
6 is compressed to bring the entire circumference of the lower edge 12b of the outer peripheral portion 12a into contact with the upper surface of the lower spring receiving plate 15. As a result, the lower valve body 9 descends in the direction of arrow _X2 together with the upper spring receiver 12 in a horizontal state, moves away from the lower surface of the lower spring receiver plate 15, and approaches the valve seat 6d of the exhaust passage 6a. do.

The elastic force of the compressed spring 20 causes the air piston 6
When the force becomes larger than the pressure of the pneumatic pressure pushing upward,
The lower spring receiving plate 15 is pushed down in the direction of arrow _X2 via the upper spring receiving portion 12. As a result, the upper valve body 9 and the lower valve body 10 are integrally displaced together with the upper spring receiving portion 12 and the lower spring receiving plate 15 in the direction of arrow _X2 . Therefore, as shown in FIG. 4, the upper valve body 9 contacts the valve seat 6d and closes the exhaust passage 6a, and the lower valve body 10 separates from the valve seat 6e to open the intake passage 6b. .

The upper valve body 9 is maintained in a horizontal state by the spring 16 and is also in a state close to the valve seat 6b, so that the switching operation is performed quickly, the loss of air pressure is minimal, and the valve seat 6d is stably moved. comes into contact with.

The upper chamber 4b and the lower chamber 4c are opened by opening the intake passage 6b.
The air pressure flows into the upper chamber 4b, and the pressure in the upper chamber 4b and the lower chamber 4c become the same. Therefore, the lower valve element 10 and the lower spring receiving plate 15 are biased by their own weight and the spring 16, and the upper valve element 9 and the upper spring receiving part 12 are displaced separately in the direction of arrow _X2 , and the lower spring Receiving plate 15
is spaced apart from the edge 12b of the upper spring receiving portion 12 and comes into contact with the upper surface of the upper valve body 9.

In this way, the switching valve 8 is quickly switched to close the exhaust passage 6a and open the intake passage 6b to supply air pressure to the upper chamber 4b.

Since the pressure receiving area on the upper chamber 4b side of the air piston 6 is larger than the pressure receiving area on the lower chamber 4c side by the circular cross-sectional area of the rod 17, the air piston 6 is pressed by the air pressure in the upper chamber 4b and moves in the opposite direction of the arrow X. Displaces in _two directions. The air piston 6 is displaced in the direction of arrow _X2 while allowing air in the lower chamber 4c to flow into the upper chamber 4b from the intake passage 6b with the exhaust passage 6a closed.

As the air piston 6 returns in the direction of arrow _X2 ,
The pump-side valve body 32 is unseated to open the flow path 31b, and the piston 31 is pressed by the stepped portion 17c of the rod 17 and displaced in the direction of arrow _X2 . piston 3
1, the ball 27 of the foot valve 26 closes the flow path 27a, and the lower chamber 25b of the cylinder 25 closes the flow path 27a.
The fluid filled in the upper chamber 2 passes through the flow path 31b.
5a. Further, as the piston 31 moves downward, the rod 17 is inserted into the cylinder 25 from the outside of the pump body 23, and a volume of fluid corresponding to the cross-sectional area of the inserted rod 17 is transferred to the discharge port 25.
The liquid is fed under pressure to the container 36 from 3a.

When the air piston 6 further moves downward in the direction of arrow _X2 , the lower valve body 10 of the switching valve 8 comes into contact with the spring 21, as shown in FIG. Switching valve 8 is arrow X ₂
The lower valve body 10 is displaced upwardly in the direction of the arrow _X1 against the spring 16 while compressing the spring 21. Therefore, as the lower valve body 10 approaches the valve seat 6e, the upper surface of the lower spring receiving plate 15 comes into contact with the edge 12b of the upper spring receiving part 12,
Compress spring 16. Further, when the air piston 6 is displaced downward in the direction of the arrow X ₂ and the elastic force of the spring 21 becomes greater than the pressing force of the air pressure that presses the air piston 6 in the direction of the arrow X ₂ , the lower valve body 10 It moves relatively upward and comes into contact with the valve seat 6e to close the intake passage 6b.

As the lower valve element 10 moves upward, the lower spring receiving plate 15 presses the upper spring receiving part 12 in the direction of _arrow The upper valve body 9 moves upwardly in the direction of arrow _X1 from a position close to the upper valve body 9.

As shown in FIG. 2, the switching valve 8 is connected to the intake passage 6b.
The air pressure supply is cut off by blocking the exhaust passage 6.
The valve a is opened to communicate the upper chamber 4b and the exhaust hole 18. Therefore, the air pressure in the upper chamber 4b is reduced to the exhaust passage 6.
The air is discharged from the exhaust hole 18 of the rod 17 through the upper chamber 4b, and the inside of the upper chamber 4b becomes atmospheric pressure. Therefore, the upper valve body 9 is not subjected to the pressing force in the direction of the arrow X ₂ due to air pressure, but is quickly moved upward in the direction of _the arrow It comes into contact with the lower surface side of the spring receiving plate 15. As a result, the pneumatic loss during the switching operation is minimal.

In this way, the upper chamber 4b in the air cylinder 4
A pressure difference is created between the air piston 6 and the lower chamber 4c, and the air piston 6 is again displaced upward in the direction of arrow _X1 . tank 2
The fluid in the air piston 9 is continuously pumped into the container 36 by the reciprocating movement of the piston 31, which is integrally displaced with the air piston 6.

Note that, as shown in FIG. 6, the outer diameter of the connecting pin 11 is smaller than the inner diameter of the intake passage 6b, and there is also a gap between the center hole diameter of the lower valve body 10 and the mounting member 7. The valve bodies 9 and 10 are assembled so as to be tiltable. Moreover, since the wire diameter of the ends of the springs 20, 21 is reduced toward the tips, the pressure of the springs 20, 21 may vary depending on the contact with the springs 20, 21. There are cases where the effect is biased. Therefore, air piston 6
If the displacement speed of the switching valve 8 is slow or the supplied air pressure is low, the valve body 9 or 10 may tilt when the switching valve 8 comes into contact with the spring 20 or 21.

For example, as shown in FIG. 6, the air piston 6 is displaced downward in the direction _of the arrow
1, the upper valve body 9 is separate from the lower valve body 10, so the exhaust passage 6a
remains occluded. For this reason, the lower valve body 10
Even if the piston is tilted, both the suction and exhaust passages 6a and 6b will not open, thereby preventing an accident in which the air piston 6 stops and becomes inoperable due to the half-open state of both passages 6a and 6b. The lower valve body 10 connects the right side of the lower spring receiving plate 15 to the edge 12a of the upper spring receiving part 12.
It tilts to a position where it abuts, and further tilting is restricted. Lower valve body 10 and lower spring receiving plate 15
Air piston 6 moves further toward arrow X ₂ while tilting.
When the spring 21 is displaced downward in the direction, the entire circumference of the spring 21 comes into contact with the lower surface side of the lower valve body 10, and the lower valve body 10 gradually returns to the horizontal state as shown in FIG.

The elastic force of the spring 21 moves the air piston 6 along the _arrow
If the pressure in the direction becomes greater than the pneumatic pressure,
Similarly to the switching operation described above, the lower valve body 10 relatively approaches the valve seat 6e, the lower spring receiving plate 15 comes into contact with the upper spring receiving portion 12, and the upper valve body 9 separates from its seat. Therefore, the air pressure in the upper chamber 4b is reduced to the exhaust passage 6.
a, the air is discharged through the exhaust hole 18, and the upper valve body 9 quickly moves upward due to the elastic force of the spring 16 and comes into contact with the lower surface side of the lower spring receiving plate 15. The switching valve 8 closes the intake passage 6b and opens the exhaust passage 6a.

Further, as shown in FIG. 8, when the air piston 6 is displaced upward in the direction of _arrow Although it is inclined together with the receiving part 12, the lower valve body 10 is separate from the upper spring receiving part 12, so the intake passage 6b remains closed. The upper spring receiver 12 is inclined until the right edge 12b contacts the upper surface of the lower spring receiver plate 15, and further inclination is restricted.

When the air piston 6 is further displaced upward in the direction of arrow _X1 while the upper spring receiver 12 and the upper valve body 9 are tilted, the entire circumference of the spring 20 comes into contact with the upper surface side of the upper spring receiver 12, as described above. Upper spring receiver 12
Then, the edge 12b gradually comes into contact with the upper surface side of the lower spring receiving part 15 over the entire circumference and returns to the horizontal state. The spring 16 is compressed and the upper valve body 9 approaches the valve seat 6d,
Further, with the relative downward movement of the switching valve 8, the valve seat 6d is brought into contact with the lower valve body 10, and the lower valve body 10 is separated from the seat.

Therefore, the switching valve 8 is displaced as shown in FIG. 4 to close the exhaust passage 6a and close the intake passage 6.
Open valve b.

In this way, the upper valve body 9 or the upper valve body 1
Even if the valve 0 is tilted, since the valve bodies 9 and 10 are separate bodies, they are not affected by the inclination of the other valve body, and the valve bodies 9 and 10 are both separated from each other to be in a half-open state, and the supplied air is not affected. This prevents an accident in which the air piston 6 is stopped and becomes inoperable due to pressure passing through the intake passage 6a, upper chamber 4b, and exhaust passage 6b from the lower chamber 4c in the air cylinder 4 and being discharged from the exhaust hole 18. be done. Therefore, even if either one of the valve bodies 9, 10 is tilted, the device will not become inoperable and the fluid in the tank 29 can be stably pumped into the container 36.

Effects of the Invention As described above, the pump device according to the present invention has a first valve body provided in the drive side piston that opens and closes the exhaust passage, and a second valve body that opens and closes the intake passage, which are separately provided. Therefore, even if one valve body is tilted, the other valve body will not be tilted and the valve can be maintained in the closed state.Moreover, even if either valve body is tilted, the third spring member Since the normal posture can be restored by the pressing force of the valve, even if one of the valve discs is tilted, the other valve disc will not be affected, and if the tilt of the valve disc causes both valve discs to open and become inoperable. Accidents can be definitely prevented. Moreover, during the switching operation of the switching valve, the valve body is brought close to the valve seat, and the elastic force of the third spring member quickly moves the first valve body to and from the seat, thereby minimizing air pressure loss. It has features such as being able to operate efficiently with supplied air pressure.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of an embodiment of the pump device according to the present invention, Fig. 2 is an enlarged sectional view of the switching valve of the device shown in Fig. 1, and Figs. Sectional view for explaining the switching operation of the valve, No. 6,
7 and 8 are cross-sectional views for explaining the switching operation of the switching valve when the first valve element or the second valve element of the switching valve is inclined, respectively. 1... Air motor main body, 4... Air cylinder, 5... Cap, 6... Air piston, 8...
...Switching valve, 9...Upper valve body, 10...Lower valve body,
11...Mounting screw, 12...Upper spring receiver, 14
...Connecting pin, 15...Lower spring receiving plate, 16...
Coil spring, 17...rod, 18...exhaust hole,
20, 21... Coil spring, 22... Regulator, 23... Pump main body, 25... Pump cylinder, 26... Foot valve main body, 31... Piston, 32... Valve body.

Claims (1)

[Claims for Utility Model Registration] The inside of a pump drive side cylinder supplied with air pressure as a pump drive source is divided into an upper chamber and a lower chamber, and an intake passage that supplies the air pressure from the lower chamber to the upper chamber; A pump driving side piston having an exhaust passage for discharging air pressure from the upper chamber, and a reciprocating movement of the pump driving side piston abuts on first and second spring members provided in the upper chamber and the lower chamber. , whereby a switching valve that alternately closes the intake passage and the exhaust passage is provided, one side is provided with the pump drive side piston, and the other side is provided with the pump side piston that reciprocates within the pump side cylinder, and the pump drive side piston is provided on the other side. A pump device comprising a pump-driving piston and a pump-driving rod having an exhaust hole between the pump-driving piston and the exhaust passage communicating with the atmosphere, wherein the switching valve is configured such that the pump-driving piston is a first valve body that opens the exhaust passage on the upper chamber side when the pump drive piston is displaced toward the upper chamber, and closes the exhaust passage on the upper chamber side when the pump driving piston is displaced toward the lower chamber; , which is integrally connected to the first valve body via a coupling member, and when the pump driving side piston is displaced to the end on the upper chamber side, it comes into contact with the first spring member in the upper chamber, and the first spring member contacts the first spring member in the upper chamber. a first spring bearing member that displaces the valve body to close the valve; and a first spring bearing member that is slidably fitted to the coupling member;
a second spring bearing member interposed between the first valve body and the first spring bearing member; and a second spring bearing member compressed between the first spring bearing member and the second spring bearing member. The spring member No. 3 is integrally connected to the second spring receiving member via a connecting member passing through the intake passage, and when the pump drive side piston is displaced to the upper chamber side end, the second spring member When the receiving member contacts the first spring receiving member and opens the intake passage on the lower chamber side, and when the pump driving side piston is displaced to the lower chamber side end, the second spring member in the lower chamber A pump device comprising a second valve body that abuts and closes the intake passage.