JPH09310678A - Hydraulic diaphragm pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply operating oil in a oil reserving chamber surely and correctly by forming an operating oil feed mechanism provided with a shaft body penetrated in the opening part of an operating oil feeding passage, a valve element provided with a surface which is brought into contact/discontact with the rear end opening part of the operating oil feed passage, and a contact element which is brought into contact/discontact with a diaphragm. SOLUTION: In an operating oil feed mechanism 6 especially, a shaft body 14 is penetrated in the opening part of an operating oil feed passage 19 opened to an oil reserving chamber 4. A valve element 15 is arranged on the rear end part of the shaft body 14, and provided with a surface which is brought into contact/discontact with the rear end opening part of the operating oil feed passage 19. A contact element 16 is arranged on the top end part of the shaft body 14, and be brought into contact/discontact with a diaphragm 3. The contact element 16 is energized toward the diaphragm 3 by a coil spring 17. A check valve 20 is arranged in the operating oil feed passage 19. It is thus possible to feed operating oil into the oil reserving chamber 4 correctly and surely. It is also possible to simplify a structure, and there is no part for carrying out regulation while having careful caution in a device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic diaphragm pump, and more specifically, it can reliably and easily replenish hydraulic oil, there are few diaphragm breakage accidents, and there are no complicated adjustment parts, and the structure is simple. The present invention relates to a hydraulic diaphragm pump.

[0002]

2. Description of the Related Art A conventional hydraulic diaphragm pump has a pump chamber, a diaphragm, an oil storage chamber, a partition valve, an oil supply passage, an oil supply valve, and a plunger.

The oil replenishing passage is provided so as to branch into a through passage and the through passage from a front end opening portion opening toward the oil storage chamber side to a rear end opening portion opening toward the plunger side, and has an oil replenishing valve. And a fork. In the through passage, a sluice valve disposed on the oil storage chamber side from the shunt passage, and a shaft body pivotally supported by a rear end portion of the sluice valve and extending from the divergence passage to a rear end opening portion on the plunger side. And are inserted and placed. At the end of the shaft body, a valve body having a conical peripheral surface formed so as to protrude from the rear end opening to the outside is provided.

When the hydraulic diaphragm pump is not operating and is in a stationary state, the sluice valve is urged by a suitable urging member in a direction in which the sluice valve pops out from the through passage. Since the sluice valve is urged by the urging member, the valve body present at the end of the shaft body provided in the sluice valve is also urged in the same direction, and the conical peripheral surface of the valve body is urged. This closes the rear end opening.

As an operation of such a conventional hydraulic diaphragm pump, when the plunger is pulled and moved, the oil stored in the oil storage chamber is sucked and the oil storage chamber becomes negative pressure. When the pressure in the oil storage chamber becomes negative, the diaphragm expands or expands toward the plunger side. The volume inside the pump chamber increases as the diaphragm expands or expands. Due to the increase in the volume of the pump chamber, the fluid is introduced into the pump chamber through the fluid introduction hole provided in the pump chamber. While the fluid is being introduced, the check valve provided in the fluid outlet hole attached to the pump chamber closes the fluid outlet hole so that the fluid cannot be led out. The diaphragm further expands or expands in response to the pulling of the plunger, and presses the gate valve. When the gate valve is pressed, the valve element mounted on the gate valve opens the oil supply passage. Furthermore, the oil supply valve provided in the oil supply path is also opened. Eventually, the valve body and the oil supply valve open the oil supply path, so that the oil is supplied from the oil supply path into the oil storage chamber.

The plunger changes from its pulling motion to a pushing motion. The pushing motion of the plunger pushes the oil into the oil storage chamber, and the expanded diaphragm is reduced.
The fluid in the pump chamber is discharged from the fluid outlet hole by the contraction or contraction of the diaphragm. At this time, the check valve in the fluid introduction hole closes the fluid introduction hole so that the fluid in the pump chamber cannot flow backward. When the plunger makes a pushing motion, the oil supply passage is closed by the valve body and the oil supply valve.

By repeating the pulling motion and the pushing motion of the plunger as described above, the diaphragm repeatedly expands and contracts, and the suction of the fluid into the pump chamber and the discharge of the fluid from the pump chamber are repeated.

However, in the conventional oil-type diaphragm pump, accurate dimensional control of the "gap seal" portion of the sluice valve is complicated. The sluice valve is inserted and arranged in the oil supply passage, and a "gap seal" is formed by the outer peripheral surface of the sluice valve and the inner peripheral surface of the oil supply passage. This "gap seal" must have a gap to the extent that oil does not flow between the outer circumference of the sluice valve and the inner circumference of the oil supply passage, and thus the sluice valve can move within the oil supply passage. . Therefore, since the "gap seal" must be formed by such a delicate fitting, dimensional control during processing is complicated and difficult. Even if such strict dimensional control can be performed, if the "gap seal" part wears out due to repeated operation of the sluice valve, the inner peripheral surface of the oil supply passage and the shaft There is a problem in that a gap is formed between the outer peripheral surface of the body and a portion through which oil can flow, and effective pressure cutoff cannot be performed.

Further, in the conventional hydraulic diaphragm, an urging member such as a spring is used for the oil supply valve, and there is a problem that adjusting the urging force of the urging member is complicated and difficult.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic diaphragm pump that does not have the above problems. Another object of the present invention is to provide a hydraulic diaphragm pump capable of accurately and reliably supplying hydraulic oil to an oil chamber. It is an object of the invention to provide a hydraulic diaphragm pump which is simple in construction and has no points which must be adjusted with great care. An object of the present invention is to provide a hydraulic diaphragm pump with less damage to the diaphragm.

[0011]

According to a first aspect of the present invention for solving the above-mentioned problems, a pump chamber capable of sucking and discharging by reciprocating movement of a diaphragm and a diaphragm separated from the pump chamber. A first oil chamber, a plunger that sucks and pushes out oil in the first oil chamber, and a hydraulic oil supply mechanism are provided, and the hydraulic oil supply mechanism is provided in a hydraulic oil supply path that opens toward the first oil chamber. A shaft body inserted in the opening,
A valve body provided at a rear end portion of the shaft body and having a surface capable of being brought into contact with and separated from a rear end opening portion of the hydraulic oil supply passage; and a valve body provided at a tip end portion of the shaft body, being brought into contact with the diaphragm. A hydraulic diaphragm pump, comprising: a possible contact, an urging member for urging the contact toward a diaphragm, and a check valve provided in the hydraulic oil supply path. In the invention according to Item 2, the valve body has a peripheral surface that spreads spherically or conically from the rear end portion of the shaft body, and the peripheral surface is in contact with the rear end opening of the hydraulic oil supply passage. 2. The hydraulic oil supply passage according to claim 1, wherein the hydraulic oil supply passage is closed so that the peripheral surface is separated from the rear end opening of the hydraulic oil supply passage to open the hydraulic oil supply passage. It is a hydraulic diaphragm pump.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The hydraulic diaphragm pump of the present invention has a function of sucking and discharging the fluid in the pump chamber by the movement of the diaphragm. Therefore, this diaphragm is made of a flexible material. The oil storage chamber and the pump chamber are separated by a diaphragm. The oil in the oil storage chamber is sucked and extruded according to the reciprocating movement of the plunger (or piston).

A hydraulic oil supply passage is provided in the oil storage chamber. This hydraulic oil supply passage does not have a through passage and a branch passage as in the conventional case, but is formed by a single supply passage that communicates with an oil supply source from an opening opening toward the diaphragm. Furthermore, this hydraulic oil supply passage is a single liquid flow passage formed by a shaft body insertion passage described later, a valve body accommodating portion, and an oil circulation hole communicating from the valve body accommodating portion to an oil supply source. Is. Further, an air bleeding valve is provided above the oil storage chamber.

A shaft is inserted into the shaft insertion path.
This shaft insertion path extends in a direction orthogonal to the diaphragm surface in the initial state from the opening to a predetermined depth, in other words, from the opening to the innermost part of the moving range of the inserted shaft. , Opened or drilled.

The shaft body to be inserted is usually long and is formed so that a valve body and a contactor, which will be described later, can be mounted or provided. However, the shaft body in the present invention is preferably cylindrical or cylindrical.

A valve body is provided at the rear end of the shaft body for opening and closing the inside of the hydraulic oil supply passage in accordance with the movement of the shaft body in the axial direction. A preferable valve body has a valve body having a diameter larger than a diameter of a reduced diameter portion provided in a hydraulic oil supply passage into which a shaft body having a cylindrical shape or a cylindrical shape is inserted.

Further, the valve body has a shaft body insertion passage (corresponding to a reduced diameter portion) formed so that the shaft body can be inserted from the front end opening portion of the hydraulic oil supply passage toward the inner side with a predetermined length. .)
A valve body disposed at a rear end portion of a shaft body inserted into the valve body housing portion having a diameter larger than the shaft body insertion path (the valve body housing portion forms a valve body housing space). Is provided. The valve body has a function of opening and closing an opening (rear end opening) on the valve body accommodating portion side of the shaft body insertion path. This function is achieved, for example, by the peripheral surface portion of the valve body having a peripheral surface (spherical peripheral surface or conical peripheral surface) that spreads spherically or conically from the joint portion of the shaft body with the valve main body, or When the valve body is a cylindrical body, it is achieved by having an end face that is coupled to the shaft body. The spherical peripheral surface, the conical peripheral surface, or the end surface connected to the shaft body is brought into contact with or separated from the rear end opening portion of the shaft body insertion path by the back and forth movement of the shaft body.

Since this valve body is formed so as to be separable from the rear end opening of the shaft insertion passage, when the valve body separates from the rear end opening of the shaft insertion passage, it is closed until then. The shaft insertion path is opened, and the hydraulic oil can flow from the hydraulic oil supply path into the oil storage chamber all at once.

A contact is attached to the tip of the shaft. The contactor is biased toward the diaphragm by the biasing member. The shape of the contact is sufficient if it can be pushed back by the expanding or deforming diaphragm to retract the shaft, and is preferably disk-shaped. As the urging member, various types of spring members can be adopted as long as they can urge the shaft body connecting the contacts toward the diaphragm. For example, a coil spring is preferably used.

Since the shaft body has the valve body, it does not come out of the opening due to the urging force of the urging member.

In the hydraulic oil supply passage, a check valve is attached to an oil circulation hole extending from the valve body accommodating portion to the hydraulic oil source. The check valve can be preferably formed by an oil passage hole provided in the hydraulic oil supply passage and a ball body (sphere) having a diameter larger than that of the oil passage hole.

The hydraulic diaphragm pump having the above construction operates as follows.

In the normal case, the diaphragm bends toward the plunger by sucking the oil in the oil storage chamber by the reciprocating motion of the plunger, and the diaphragm moves in the direction opposite to the plunger by pushing the oil in the oil storage chamber. Due to the bending, the volume of the pump chamber is increased or decreased, the fluid is sucked into the pump chamber, and the fluid is discharged from the pump chamber. Each time such a pump action is repeated, the oil in the oil storage chamber is discharged together with the bubbles from the air bleeding valve, and the amount of oil in the oil storage chamber decreases.

When the plunger is retracted with respect to the diaphragm with the amount of oil in the oil storage chamber reduced to some extent,
The oil in the oil storage chamber is sucked as the plunger retreats, and the pressure in the oil storage chamber becomes negative so that the diaphragm bends so as to come into contact with the contact.

When the plunger is further retracted, the diaphragm bends further and presses the contact. When the contactor is pressed, the shaft body also retracts against the biasing force of the biasing member. The valve body opens the rear end opening of the shaft body insertion path by the retraction of the shaft body. Further, since the oil storage chamber is under negative pressure, the check valve opens the oil circulation hole so that hydraulic oil can flow. From the hydraulic oil supply passage opened by the valve body and the check valve, hydraulic oil flows into the oil storage chamber until the plunger reaches the bottom dead center. After that, when the plunger starts to move forward, the diaphragm is pushed in the direction to return to the flat state, and at the same time, the contact element moves forward toward the pump chamber by the urging force of the urging member and the valve body closes the hydraulic oil supply passage. Then, the check valve accordingly closes the hydraulic oil supply passage.

When the amount of oil in the oil storage chamber decreases, the working oil is thus supplied to the oil storage chamber.

When the plunger moves forward, the oil in the oil storage chamber is pushed to bend the diaphragm toward the side opposite to the plunger. At this time, the check valve is turned on even though the pressure in the oil storage chamber rises. Since the valve closes the hydraulic oil supply passage, the oil in the oil storage chamber does not flow back.

In the hydraulic diaphragm pump of the present invention, a valve which does not use a "gap seal" is adopted,
Since the separately installed oil supply valve has been eliminated and a check valve has been adopted, this hydraulic diaphragm pump has a simple structure, and since the hydraulic oil is constantly and automatically maintained at a constant volume, the diaphragm is excessively curved. No damage and little damage.

[0029]

1 is a schematic cross-sectional explanatory view showing a hydraulic diaphragm pump according to an embodiment of the present invention.

As shown in FIG. 1, the hydraulic diaphragm pump 1 includes a pump chamber 2, a diaphragm 3, an oil storage chamber 4, a plunger 5, an air bleeding valve 26, and a hydraulic oil supply mechanism 6. .

The pump chamber 2 is a space formed by the inner wall 7 of the pump body and the diaphragm 3, and a fluid introduction passage 8 and a fluid discharge passage 9 formed in the pump body are provided so as to communicate with this space. To be When the pump chamber 2 has a negative pressure in the fluid introduction passage 8, the fluid is introduced into the pump chamber 2 from the fluid introduction passage 8, but the fluid flows backward from the inside of the pump chamber 2 into the fluid introduction passage 8. A first check valve (not shown) is provided to prevent this. When the pump chamber 2 has a positive pressure in the fluid discharge passage 9, the fluid in the pump chamber 2 flows out to the fluid discharge passage 9, but when the pump chamber 2 has a negative pressure, the fluid is discharged from the fluid discharge passage 9. A second check valve (not shown) is provided to prevent reverse flow of fluid into the pump chamber 2.

The diaphragm 3 is a thin film made of a flexible material.

The oil storage chamber 4 is a space formed by the diaphragm 3 and the inner wall 10 of the pump body. A concave portion 11 is formed on the inner wall 10 of the pump body that defines the space, that is, the inner wall 10 of the oil storage chamber 4. This recess 11
An opening of the hydraulic oil supply passage opens at the bottom of the. The opening has a circular shape when viewed from the diaphragm 3 side. A hole having a circular cross section (more precisely, a circular cross section in the direction orthogonal to the diaphragm 3) is formed from this opening toward the inner wall 10 of the oil storage chamber 4. Behind this hole is a large-diameter hole 12 having a diameter even larger than the diameter of this hole. Inner wall 1 of oil storage chamber 4
The hole from the opening of 0 to the large diameter hole 12 can be referred to as a small diameter hole 13. The large-diameter hole 12 is the above-mentioned valve body housing portion or valve body housing space, and the small-diameter hole 13 is a shaft body insertion passage.

A shaft 14 having a circular cross section is inserted into the small diameter hole 13. The rear end portion of the shaft body 14 extends to the large diameter hole 12. The rear end portion of the shaft body 14 existing in the large diameter hole 12 is designed to have a circular cross section that is larger than the diameter of the small diameter hole 13 and smaller than the diameter of the large diameter hole 12 (the cross section referred to here is also orthogonal to the diaphragm 3). The cross section of the valve main body 15 corresponds to the direction (1). The valve body 15 has an outer peripheral surface that gradually expands in a conical shape from the outer periphery of the shaft body 14. When the outer peripheral surface abuts a step that is a boundary between the small diameter hole 13 and the large diameter hole 12, the small diameter hole is formed. 13 and the large diameter hole 12 are blocked so that they cannot flow. The valve body 15 may have an outer peripheral surface that expands in a spherical shape from the outer periphery of the shaft body 14.

A disk-shaped contactor 16 is attached to the tip of the shaft body 14. One end of a coil spring 17 as an urging member is fixed to the base of the contactor 16 to which the shaft 14 is attached, and the other end of the coil spring 17 is fixed to the recess 11 of the oil storage chamber 4. . The contact element 16 is constantly urged toward the diaphragm 3 by the urging force of the coil spring 17, and thus the shaft body 14
The outer peripheral surface of the valve body 15 provided at the rear end abuts on the step to block the small diameter hole 13 and the large diameter hole 12 from flowing.

A stopper 18 is provided in the large diameter hole 12.
Is provided at the predetermined position when the shaft body 14 retreats against the urging force of the coil spring 17.
The retreat of 4 is blocked.

On the other hand, the large-diameter hole 1 is provided further in the hydraulic oil supply passage 19 having the small-diameter hole 13 and the large-diameter hole 12 as described above.
A check valve 20 is provided in the oil passage that communicates with the hydraulic oil source from 2. The check valve 20 has a function of allowing the hydraulic oil in the hydraulic oil supply passage 19 to flow to the oil storage chamber 4 but preventing the reverse flow thereof. In this embodiment, the check valve 20 is arranged in the hydraulic oil supply passage 19. The spherical body 20a and the reduced diameter portion 20b having a diameter smaller than the diameter of the spherical body 20a. An oil circulation hole is provided in the reduced diameter portion 20b.

In this way, the shaft body 1 inserted through the opening of the hydraulic oil supply passage 19 opening toward the oil storage chamber 4 is described.
4 and a valve body 15 provided at the rear end of the shaft body 14.
A contactor 16 provided at the tip of the shaft body 14 and capable of coming into contact with the diaphragm 3; a biasing member or coil spring 17 for biasing the contactor 16 toward the diaphragm 3; The check valve 20 provided in the oil supply path 19 constitutes the hydraulic oil supply mechanism 6.

On the other hand, the hydraulic chamber 21 is provided adjacent to the oil storage chamber 4.
Is provided. In this hydraulic chamber 21, one end of a cylinder 23 equipped with a reciprocating plunger 22 is opened. The hydraulic chamber 21 and the oil storage chamber 4 are communicated with each other through a communication hole 24 which is a through hole, and a communication hole 25 which is a through hole which penetrates from the bottom of the recess 11 to the hydraulic chamber 21. . In addition, on the upper surface of the hydraulic chamber 21,
Air bleeding valve 26 for releasing air bubbles generated in hydraulic oil
Are attached via a communication hole 27 which is a through hole.

Next, the operation of the hydraulic diaphragm pump 1 having the above structure will be described.

When a sufficient amount of hydraulic oil is present in the oil storage chamber 4 and the hydraulic chamber 21, it normally operates as follows.

The plunger 22 is driven by a driving means (not shown).
Hydraulic fluid in the hydraulic chamber 21 when the cylinder is retracted.
The hydraulic oil in the oil storage chamber 4 is drawn in and flows through the communication holes 24 and 25 to move into the hydraulic chamber 21. Since the amount of hydraulic oil in the oil storage chamber 4 decreases, the inside of the oil storage chamber 4 has a negative pressure, which causes the diaphragm 3 to bend toward the contactor 16 side. Since the diaphragm 3 is curved toward the contactor 16 side, the volume inside the pump chamber 2 is increased. As the volume of the pump chamber 2 increases, the fluid is introduced into the pump chamber 2 from the fluid introduction passage 8. At this time,
Since the second check valve is provided in the fluid outlet passage 9, the fluid existing in the fluid outlet passage 9 does not flow back into the pump chamber 2.

When the plunger 22 is moved forward, the hydraulic oil in the cylinder 23 is pushed out into the hydraulic chamber 21 and the hydraulic chamber 2
The hydraulic oil in 1 is pushed into the oil storage chamber 4 through the communication hole 24 and the communication hole 25. When the hydraulic oil is pushed into the oil storage chamber 4, the diaphragm 3 bends toward the side opposite to the contactor 16. The volume of the pump chamber 2 decreases due to the bending of the diaphragm 3. As the volume of the pump chamber 2 decreases, the fluid in the pump chamber 2 is discharged from the fluid outlet 9 to the outside of the pump chamber 2. At this time, the fluid introduction path 8
Since the first check valve is provided in the pump, the fluid does not flow back from the pump chamber 2 into the fluid introduction passage 8.

Bubbles are generated in the hydraulic oil as the operation of the hydraulic diaphragm pump 1 is repeated. The generated bubbles are discharged to the outside of the hydraulic chamber 21 together with the hydraulic oil discharged by the air bleeding valve 26 that operates every stroke of the plunger 22 in a very small amount, but a fixed amount. The amount decreases.

When the amount of hydraulic oil in the hydraulic chamber 21 decreases to some extent, the hydraulic diaphragm pump 1 operates as follows.

When the plunger 22 is retracted, the diaphragm 3 bends toward the contact 16 as described above. Since the amount of hydraulic oil has decreased, the degree of bending of the diaphragm 3 is greater than in the case of normal operation. The greatly curved diaphragm 3 presses the contactor 16 and retracts the contactor 16 against the biasing force. When the contactor 16 retracts, the shaft body 14 also retracts, whereby the valve body 1
The outer peripheral surface of 5 is separated from the step between the small diameter hole 13 and the large diameter hole 12, and the small diameter hole 13 and the large diameter hole 12 are opened so that they can flow. When the small-diameter hole 13 and the large-diameter hole 12 are opened so that they can communicate with each other, the hydraulic oil supply passage 19 up to the check valve 20 becomes a negative pressure as in the oil storage chamber 4, and as a result of the negative pressure, the check valve is released. 20 opens the hydraulic oil supply passage 19. Valve body 15 and check valve 20
The operation oil is supplied to the oil storage chamber 4 by opening the operation oil supply passage 19 by the operation of. When the hydraulic oil is replenished into the oil storage chamber 4, the movement of the diaphragm 3 bending toward the contactor 16 side stops despite the plunger 22 retracting. This position is the maximum bending position of the diaphragm 3.

By moving the plunger 22 forward,
When hydraulic oil is pushed into the oil storage chamber 4, the check valve 20 closes the hydraulic oil supply passage 19, and the shaft body 14 is moved forward by the biasing force of the coil spring 17. The forward movement of the shaft 14 brings the outer peripheral surface of the valve body 15 into contact with the step, and the hydraulic oil supply passage 19 is closed. By further moving the plunger 22 forward, hydraulic oil is pushed into the oil storage chamber 4 to bend the diaphragm 3 to the side opposite to the contactor 16. The fluid in the pump chamber 2 is discharged by this bending of the diaphragm 3, but at this time, even though the oil storage chamber 4 is at a positive pressure, the check valve 20 prevents the fluid from being stored in the oil storage chamber 4. The hydraulic oil does not flow back into the hydraulic oil supply passage 19.

As described above, when the amount of hydraulic oil in the oil storage chamber 4 and the hydraulic chamber 21 is reduced, the degree of bending of the diaphragm 3 is increased. By pressing the contactor 16, the hydraulic oil supply path 19 is automatically and automatically supplied with hydraulic oil into the oil storage chamber 4. Diaphragm 3 by replenishing hydraulic oil
Deformation motion of the robot stops. After that, since the hydraulic oil is discharged from the air bleeding valve 26 in a constant amount, the diaphragm 3 repeats the operation with reference to the above-mentioned maximum bending position, that is, the position where the hydraulic oil is replenished. If a phenomenon occurs in which the hydraulic oil is replenished more than necessary for some reason, the diaphragm 3 does not press the contact 16 because the hydraulic oil in the storage chamber 4 exceeds the specified amount, and The replenishment is not performed until the hydraulic oil in the storage chamber 4 is reduced to the specified amount. Therefore, as a result of this embodiment and this embodiment, the problem of the conventional diaphragm 3 pump that the diaphragm 3 is excessively deformed and damaged is solved.

The apparatus of this embodiment uses a check valve that does not have a biasing member that requires adjustment of the biasing force, and does not use a "gap seal". Therefore, the hydraulic oil supply mechanism has a simple structure. Is a hydraulic diaphragm pump equipped with.

In the apparatus of this embodiment, the amount of hydraulic oil in the storage chamber is kept constant, and the operating position of the diaphragm is always kept at the same position. Therefore, damage due to excessive deformation of the diaphragm is prevented.

[0051]

According to the present invention, it is possible to provide a hydraulic diaphragm pump capable of accurately and reliably supplying hydraulic oil to the oil storage chamber. According to the present invention, it is possible to provide a hydraulic diaphragm pump which has a simple structure and does not have a portion which must be adjusted with great care. According to the present invention, it is possible to provide a hydraulic diaphragm pump that is less likely to damage the diaphragm.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional explanatory view showing a hydraulic diaphragm pump according to an embodiment of the present invention.

[Explanation of symbols]

1 ... hydraulic diaphragm pump, 2 ... pump chamber,
3 ... Diaphragm, 4 ... Oil storage chamber, 5 ... Plunger, 6 ... Hydraulic oil supply mechanism, 7 ... Pump body inner wall, 8 ... Fluid introduction passage, 9 ... Fluid Derivation route, 1
0 ... inner wall of pump body, 11 ... recessed portion, 12 ...
..Large-diameter holes, 13 ... Small-diameter holes, 14 ... Shafts, 15
... Valve body, 16 ... Contact, 17 ... Coil spring, 18 ... Stopper, 19 ... Operating oil supply passage, 20 ... Check valve, 20a ... Sphere, 20b・ ・
・ Reduced diameter part, 21 ... hydraulic chamber, 22 ... plunger,
23 ... Cylinder, 24 ... Communication hole, 25 ...
Communication hole, 26 ... Air vent valve, 27 ... Communication hole.

Claims (2)

[Claims] 1. A pump chamber capable of sucking and discharging by a reciprocating motion of a diaphragm, a first oil chamber isolated from the pump chamber by a diaphragm, and a plunger for sucking and pushing out oil in the first oil chamber, and operating. An oil replenishing mechanism, wherein the hydraulic oil replenishing mechanism is provided at a rear end portion of the shaft body inserted through an opening of a hydraulic oil replenishing passage opening toward the first oil chamber, Further, a valve body having a surface capable of separating and contacting with a rear end opening of the hydraulic oil supply passage, a contactor provided at a tip end portion of the shaft body and capable of separating and contacting with the diaphragm, and the contactor with the diaphragm. A hydraulic diaphragm pump, comprising: a biasing member that biases the hydraulic fluid toward the engine; and a check valve provided in the hydraulic oil supply path. 2. The valve body has a peripheral surface that spreads in a spherical shape or a conical shape from the rear end portion of the shaft body. The hydraulic diaphragm pump according to claim 1, wherein the hydraulic oil pump is formed so as to open the hydraulic oil supply path by closing the supply path and separating the peripheral surface from the rear end opening of the hydraulic oil supply path. .