JPH089990B2 - Hydraulic oil pump hydraulic oil supply device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supplying hydraulic oil to a hydraulic chamber in a hydraulic diaphragm pump.

[0002]

2. Description of the Related Art Generally, a hydraulic diaphragm pump is provided between a pump chamber 14 having a suction valve 10 and a discharge valve 12 and a hydraulic chamber 20 having an air bleeding valve 16 and an oil supply valve 18, as shown in FIG. Diaphragm 22 interposed
By operating the pressure of the hydraulic oil in the hydraulic chamber 20 by the reciprocating movement of the piston 24, and reciprocating so as to invert and swell in the axial direction 26 passing through the hydraulic chamber 20 and the pump chamber 14. It is configured to perform suction and discharge actions. In the figure, the position of the diaphragm 22 shown by the solid line and the dotted line is the reverse bulge between the suction side bottom dead center and the discharge side top dead center of the diaphragm 22 corresponding to the operating position of the piston 24 also shown by the solid line and dotted line. It shows the state. Also, reference numerals L and l ₁ , l
Reference numeral ₂ denotes a process advancing / retreating width (stroke width) of the diaphragm 22 and front and rear backup plates 2 respectively.
The gaps for 8 and 30 are shown.

By the way, such a hydraulic diaphragm pump (hereinafter, may be simply referred to as a pump) is designed to remove air from the hydraulic oil in the hydraulic chamber 20 and supply air to the hydraulic oil during the pump operation. Vent valve 1
6 and the oil supply valve 18.

However, in this type of pump, when replenishing the operating oil, the oil replenishing valve 18 is constructed as a directional operating valve by negative pressure, and therefore the following drawbacks cannot be avoided.

That is, the negative pressure inside the hydraulic chamber 20 is particularly low in the working oil in the suction-side bottom dead center region of the diaphragm 22 (the gap l ₁ is eliminated as shown by the solid arrow), and the diaphragm 22 is discharged. Is the rear backup plate 3
Not only occurs in the state of being in contact with 0, but also occurs throughout the suction process (return stroke) of the diaphragm 22, particularly at the beginning thereof.

Therefore, the hydraulic oil is replenished from the early stage of the suction process, resulting in over-replenishment, and the diaphragm 22 is moved forward as shown by the dotted arrow to eliminate the gap l _2. , To contact the front backup plate 28.

Thus, in this type of pump,
As a result of replenishment of the hydraulic oil regardless of the position of the diaphragm 22, the diaphragm contacts the front backup plate, and this contact is repeated every pump action, so that the diaphragm is eventually damaged. Was unavoidable.

Therefore, in order to solve the above-mentioned problems, a hydraulic oil supply device has been developed and proposed in which the hydraulic oil can be supplied corresponding to the position of the diaphragm. That is, according to this type of hydraulic oil supply device, as disclosed in, for example, Japanese Patent Publication No. 61-49517 (see FIG. 6), a guide member is provided on the central axis 26 of the hydraulic chamber 20 of the hydraulic diaphragm pump. A mechanical lock mechanism, that is, a hydraulic oil replenishing mechanism 32, including a movable member 34 and a cylinder-shaped movable member 36, which is interposed on the member, is provided. As a result, the hydraulic oil from the oil supply valve 18 reaches the suction side bottom dead center region where the diaphragm 22 is illustrated (in this state, the movable member 36 is in close contact with the guide member 34), and the hydraulic chamber The flow passage 34 of the guide member 34 is provided only when the pressure in 20 drops to a predetermined negative pressure state.
a, check valve 34b, communication hole 34c and movable member 3
The hydraulic pressure chamber 20 is replenished by passing through the communication holes 36a.

Therefore, according to such a conventional technique, since the hydraulic oil is not oversupplied, the diaphragm does not come into contact with the front backup plate to be damaged. When the diaphragm 22 enters the discharge process (drive stroke) and moves forward (moves to the right in the figure), the movable member 36 moves forward by a predetermined distance via the spring means 36b and projects from the rear backup plate portion 30. It is configured.

[0010]

However, the above-mentioned conventional hydraulic oil supply mechanism (hereinafter sometimes referred to simply as the conventional art) still has the following drawbacks.

That is, in the above-mentioned prior art, the movable member 36 of the mechanical lock mechanism (hydraulic oil supply mechanism) 32 is
As described above, when the diaphragm 22 having the return stroke is brought into contact with and pressed by the diaphragm 22, it comes into close contact with the guide member 34 shown in FIG. 6 from the state in which the rear backup plate portion 30 shown in FIG. 7 projects into the hydraulic chamber 20. Move to state.

However, in the above-mentioned conventional technique, the diaphragm 22 is often damaged during the moving process. This difficulty results from the fact that a considerable stress is applied from the movable member 36 to a specific portion of the diaphragm 22. Therefore, to explain this below, first, referring to FIG. 7, the deformation (bulging) of the diaphragm 22 does not occur from the central portion thereof, that is, as shown in FIG. Instead of bulging symmetrically, it starts at the peripheral portion of the mounting of the diaphragm 22 and at the portion where the residual strain in the mounting is the maximum, for example, the portion A in the figure. Then, the deformation of the central portion, that is, the bulging portion 38 occurs in the portion B decentered from the central axis 26 in the direction of the portion A. Therefore, when the movable member 36 and the diaphragm 22 are brought into contact with each other, the specific portion 38a of the bulging portion 38 of the diaphragm 22 comes into point contact with the corner 36c of the movable member 36 and slides in an oblique direction. . Therefore, as described above, considerable stress is applied to the specific portion 38b. Moreover, this stress is repeated for each pump action.

As described above, in the above-mentioned conventional hydraulic oil replenishing device, although the excessive replenishment of hydraulic oil is prevented, it is unavoidable that the diaphragm is damaged in its return stroke.

Therefore, an object of the present invention is to provide a hydraulic oil pump hydraulic oil pump replenishing device capable of preventing excessive replenishment of hydraulic oil and further suppressing damage to the diaphragm.

[0015]

In order to achieve the above object, a hydraulic oil pump hydraulic oil supply device according to the present invention includes a pump chamber having a suction valve and a discharge valve, an air bleeding valve and an oil supply valve. The diaphragm interposed between the hydraulic chamber and the hydraulic chamber is reciprocated so as to invert and swell in the axial direction passing through the hydraulic chamber and the pump chamber by operating the pressure in the hydraulic chamber, thereby performing suction and discharge operations to the pump chamber. In the hydraulic oil pump hydraulic oil replenishing device configured as described above, a support body having a concave portion facing the bulging portion of the diaphragm is provided in the hydraulic chamber, and the support body is advanced and retracted in the axial direction to move the hydraulic chamber and the oil supply valve. Is pivotally mounted to a sleeve-shaped switching valve member configured to open and close a communication portion between the concave portion and the concave portion so that the posture of the concave portion facing the convex portion corresponds to the deformation angle of the convex portion. Together, characterized by configured to perform the opening of the communicating portion in the bottom dead center region of the diaphragm in the suction stroke only.

In this case, when the support and the switching valve member are in contact with each other from the diaphragm and are not pressed, the switching valve member is advanced by the spring means to the hydraulic chamber side for a predetermined distance to close the communication portion, and the support member is closed. Is configured to project into the hydraulic chamber in a state in which the concave portion is held in a posture corresponding to the deformation angle of the bulging portion of the diaphragm.

[0017]

According to the present invention, the support body retreats the switching valve member in a state where the concave portion is pressed against the bulging portion in the suction step of the diaphragm so that the hydraulic oil is replenished under the diaphragm. It is performed only in the dead zone.
Moreover, in this case, the support body is pivotally attached to the switching valve member so as to swing, and the concave portion corresponds to the deformation angle of the bulging portion.
That is, the concave portion and the bulging portion are in stable contact with each other by surface contact. Therefore, excessive replenishment of hydraulic oil is prevented, and at the same time, damage to the diaphragm is suppressed.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a hydraulic oil pump hydraulic oil replenishing device according to the present invention will now be described in detail with reference to the accompanying drawings. For convenience of explanation, the same components as those of the conventional structure shown in FIGS. 5 to 7 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, the basic construction of the hydraulic diaphragm pump of the present invention is the same as that of the conventional one shown in FIGS. 5 and 6. Therefore, although overlapping, but explained again for convenience of understanding, the hydraulic diaphragm pump has a pump chamber 14 including the suction valve 10 and the discharge valve 12, and a hydraulic chamber 20 including the air bleeding valve 16 and the oil supply valve 18. The diaphragm 22 interposed therebetween is reciprocally moved so that the piston 24 reciprocates to actuate the pressure of the hydraulic oil in the hydraulic chamber 20 to invert and bulge in the axial direction 26 passing through the hydraulic chamber 20 and the pump chamber 14. By doing so, the pump chamber 14 is configured to perform suction and discharge operations. In the figure, reference numeral 30 indicates a rear backup plate and a core portion, but the front backup plate in the conventional example is omitted because the present invention surely prevents excessive replenishment of hydraulic oil.

However, according to the present invention, in the above structure, the bulging portion 38 of the diaphragm 22 is provided in the hydraulic chamber 20.
A support body 42 having a concave portion 42a facing the
The sleeve-shaped switching valve member 44 configured to move the support body 42 in the core portion 30 in the direction of the central axis 26 thereof to open and close the communication portion 46 between the hydraulic chamber 20 and the oil supply valve 18.
Further, it is pivotally attached via a spherical bearing portion 48. Thereby, the mechanical lock mechanism, that is, the hydraulic oil supply device 4
Configure 0. The communication portion 46 includes the communication hole 30 a of the core portion 30, the flow passage 44 a of the switching valve member 44, and the communication hole 4.
4b and the flow passage 30 of the core portion 30. As a result, as will be described in detail later, the posture of the concave portion 42a facing the bulging portion 38 is made to correspond to the deformation angle of the bulging portion 38 (the eccentricity from the central axis 26), and the communication portion 46 is opened. Is performed only in the bottom dead center region of the diaphragm 22 in the suction process. In addition, between the switching valve member 44 and the core portion 30,
In the state in which the spring member 50 is interposed, whereby the support body 42 and the switching valve member 44 are in contact with the diaphragm 22 and are not pressed, that is, in the state of FIG. 1 (note that FIG. The state at the time of positive contact with the portion 38 is shown), and the switching valve member 44 is moved by the spring means 50 toward the hydraulic chamber 20 by a predetermined distance (regulating protrusion 30c).
(Distance regulated by) and the communication portion 46 is closed. On the other hand, the support body 42 projects into the hydraulic chamber 20 with the concave portion 42a thereof being held in a posture corresponding to the deformation angle of the bulging portion 38 (a posture shown in FIGS. 3 and 4 described later). It is configured.

The operation of the hydraulic oil replenishing device of the present invention having such a structure will be described below.

First, in the state shown in FIG. 1, the hydraulic chamber 20 is properly filled with hydraulic oil, and as described above, the support member 42 is used.
And the switching valve member 44 is in contact with the diaphragm 22 and is not pressed. In this case, when the amount of oil in the hydraulic chamber 20 decreases due to air bleeding or the like, the diaphragm 22 strokes (return stroke) in the suction process.
Is generally retracted to the left side in the figure, and as shown in an enlarged view in FIG. 2, the bulging portion 38 comes into contact with the upper end portion of the recess 42a of the support body 42 in the figure.

Next, when the amount of oil further decreases, the diaphragm 22 further retracts to the left side in the drawing and presses the support body 42, which causes the support body 42 to move with the switching valve member 44 as shown in FIG. With the spherical bearing portion 48 between them as the center of rotation,
The concave portion 42a rotates to a posture in which it is substantially in contact with the entire diaphragm 22 including the bulging portion 38 (that is, a posture corresponding to the deformation angle of the bulging portion 38). Note that FIG.
Shows the state at the time of this positive rotation, and the switching valve member 44 has not moved from the state of FIGS. 1 and 2.

Then, when the amount of oil further decreases, the diaphragm 22 is further retracted to the left side of the drawing to support the diaphragm 22.
The body 42 and the switching valve member 44 are also moved to the left side in the figure against the spring means 50, so that the communicating portion 46 (the communicating hole 30a, the flow passage 44a, the communicating hole 44b and The flow passage 30b) is opened. In this state, that is, in the bottom dead center region in the suction process of the diaphragm 22, when the amount of oil is still insufficient and the diaphragm 22 still tries to move to the left side in the drawing, the hydraulic chamber 20 Negative pressure is generated inside, and the hydraulic oil is supplied to the hydraulic chamber 20 through the communication portion 46 by opening the oil supply valve 18 for the first time.

When the diaphragm 22 moves to the discharge step and moves forward, the support body 42 also moves forward so as to project into the hydraulic chamber 20 via the switching valve member 44 moved forward by the spring means 50. Then, with respect to the protruding support 42,
The diaphragm 22 repeatedly contacts the suction step, but in this case, the concave portion 42a of the support body 42 maintains the posture corresponding to the deformation angle of the bulging portion 38 of the diaphragm 22 as described above. Obviously, repeated contacting will prevent damage to the diaphragm 22.

Further, in this process, since the communication portion 46 is closed, it is apparent that the hydraulic oil is not replenished even if an abnormal pressure drop occurs in the hydraulic chamber 20.

As described above, according to the present invention, the supply of the hydraulic oil from the oil supply valve into the hydraulic chamber is performed only in the bottom dead center region in the diaphragm suction process. That is, the switching valve member constituting the hydraulic oil replenishing device is pushed back by the diaphragm in the suction process via the support body also constituting the hydraulic oil replenishing device, so that the space between the oil replenishing valve and the hydraulic chamber is reduced. The connected communication part is opened, and at this time, negative pressure is generated in the hydraulic chamber (that is,
Insufficient hydraulic oil), replenishment of oil is achieved. Therefore, excessive replenishment of hydraulic oil is reliably prevented. Moreover, since the pressing of the support against the support by the diaphragm is configured to be performed via the recess of the support that is held in the posture corresponding to the deformation angle of the bulging portion of the diaphragm, the pressing is performed. The diaphragm is prevented from being damaged by.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and many design changes can be made without departing from the spirit thereof.

[0029]

As described above, in the hydraulic oil replenishing device for the hydraulic diaphragm pump according to the present invention, the hydraulic chamber of the hydraulic diaphragm pump is provided with the support member having the concave portion facing the bulging portion of the diaphragm. The support is swingably pivotally attached to a sleeve-shaped switching valve member configured to advance and retreat in the axial direction to open and close a communication portion between the hydraulic chamber and the oil supply valve, and the concave portion with respect to the bulging portion. By making the contacting posture correspond to the deformation angle of the bulging portion and performing the opening of the communication portion only in the bottom dead center region of the diaphragm in the suction process, it is possible to reliably overfill the hydraulic oil. At the same time, it is possible to effectively prevent the diaphragm from being damaged.

That is, according to the present invention, in replenishing the hydraulic oil from the oil replenishing valve into the hydraulic chamber, the switching valve member is pressed by the diaphragm through the support member and is retracted to open the communicating portion, and At this time, negative pressure is generated in the hydraulic chamber (that is, hydraulic oil is insufficient), and oil supply is achieved. Therefore, the hydraulic oil is not oversupplied. Furthermore, the pressing to the support by a diaphragm, which is configured to perform through the recess of the support body that holds the posture corresponding to the deformation angle of the bulging portion of the diaphragm, damage of the diaphragm is enabled by the pressing Be deterred.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a hydraulic oil supply device for a hydraulic diaphragm pump according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1, showing a hydraulic oil supply structure.
The state when the diaphragm is positively contacted with the support is shown.

FIG. 3 is an enlarged view of an essential part corresponding to FIG. 2, showing a state at the time when the support body rotates and the diaphragm contacts the substantially entire surface in the recess.

FIG. 4 is an enlarged view of an essential part corresponding to FIGS. 2 and 3, and shows a state at the time when the switching valve member is pressed and moved by the diaphragm and the support , and thereby the communication part is opened.

FIG. 5 is a cross-sectional view showing a configuration of a general hydraulic diaphragm pump.

FIG. 6 is a cross-sectional view showing a configuration of a conventional hydraulic oil supply device for a hydraulic diaphragm pump.

7 is a sectional view of relevant parts showing an operating state of a diaphragm of the conventional hydraulic diaphragm pump shown in FIG.

[Explanation of symbols]

10 Suction valve 12 Discharge valve 14 Pump chamber 16 Air bleeding valve 18 Oil supply valve 20 Hydraulic chamber 22 Diaphragm 24 Piston 26 Center axis 30 Rear backup plate part (core part) 30a Communication hole 30b Flow passage 30c Restricting projection 38 Expansion part 40 Operation Oil replenishing device (mechanical locking mechanism) 42 Support 42a Recess 44 Switch valve member 44a Flow passage 44b Communication hole 46 Communication section 48 Spherical bearing 50 Spring means A Diaphragm mounting peripheral area B Diaphragm bulging area

Claims (2)

[Claims] 1. A diaphragm interposed between a pump chamber having a suction valve and a discharge valve and a hydraulic chamber having an air bleeding valve and an oil supply valve passes through the hydraulic chamber and the pump chamber by operating the pressure of the hydraulic chamber. In a hydraulic diaphragm pump hydraulic oil replenishing device configured to perform suction and discharge operations in a pump chamber by reciprocating so as to invert and bulge in the axial direction, a recess facing the bulging portion of the diaphragm is provided in the hydraulic chamber. A support member having the support member is provided, and the support member is swingably pivotally attached to a sleeve-shaped switching valve member configured to advance and retreat in the axial direction to open and close a communication portion between the hydraulic chamber and the oil supply valve. The posture of the concave portion facing the bulging portion is made to correspond to the deformation angle of the bulging portion, and the opening of the communicating portion is performed only in the bottom dead center region of the diaphragm in the suction step. Hydraulic oil supply device for a hydraulic diaphragm pump, characterized by forming. 2. When the support and the switching valve member are in contact with each other from the diaphragm and are not pressed, the switching valve member is advanced to the hydraulic chamber side by a predetermined distance by the spring means to close the communication portion, and the support is 2. The hydraulic oil pump hydraulic fluid replenishing device according to claim 1, wherein the concave portion projects into the hydraulic chamber in a state in which the concave portion is held in a posture corresponding to the deformation angle of the bulging portion of the diaphragm.