JPH09250511A - Accumulator with check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a hydraulic circuit to be used with lower liquid pressure than the gas enclosed pressure of an accumulator by making the function of the accumulator to be fully performed and preventing the occurrence of damaging accident. SOLUTION: The accumulator ACC is constituted so that the inside of a container body 1 is partitioned into a gas room 5 and a liquid room 6 by a diaphragm 4 and the liquid room 6 is communicated with a fluid passage W through a combination passage. In this case, a check valve 9 is provided in the fluid passage W, the combination passage is composed of an inlet side combination passage 7 and an outlet side combination passage 8 spaced each other, the inlet side combination passage 7 is connected with the primary side of the check valve 9, and the outlet side combination passage 8 with a secondary side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an accumulator used for accumulating ernegi, shock absorption, pulsation absorption, shock absorber and the like.

[0002]

2. Description of the Related Art A conventional accumulator accommodates a gas bag inside a pressure-resistant container having a double inner and outer valve cylinder at the bottom,
Due to the expansion action of the gas bag, the pulsation of the high-pressure liquid sent into the pressure vessel from one valve cylinder is removed, and the other high pressure liquid is sent out to the outside.

Then, the inner valve cylinder is formed into an elbow shape having substantially the same cross-sectional area as the pipe, and the lower end thereof is directly passed through one pipe,
The outer valve cylinder is directly passed through the other pipe at the same or symmetrical position as the inner valve cylinder, and the valve body is arranged at the portion where the inner and outer double valve cylinders open into the pressure vessel.

[0004]

The conventional accumulator has the following problems. (1) When the accumulator gas charging pressure is higher than the circuit pressure, the separating member pushes the valve body against the valve seat and closes the valve. Therefore, since the flow of the circuit is stopped, the passage on the inlet side and the passage on the outlet side are not completely partitioned and a through hole is opened. However, since this through hole is open even when the valve body of the accumulator is open, some pulsation or the like passes through this through hole, and a good result cannot be obtained.

(2) When the valve body of the accumulator is open, a malfunction occurs in the drive source, and when a large volume of liquid flows in, a large force acts on the valve body of the accumulator due to the pressure difference. At this time, if the through hole is small, the pressure difference does not decrease, and the valve body is damaged. Conversely, if the through hole is large,
Not able to absorb pulsation.

(3) In the accumulator provided between the drive source and the actuator, when an abnormally high pressure is generated on the actuator side, the high-pressure liquid flows to the drive source side through the through hole to drive the drive source such as a pump. May cause damage.

(4) The liquid that has flowed into the liquid chamber from the inner valve cylinder may flow out from the outer valve cylinder immediately without sufficiently entering the inside. Therefore, the function of the accumulator such as pulsation absorption may not be exhibited.

In view of the above circumstances, it is an object of the present invention to make the accumulator sufficiently perform its function and prevent the occurrence of damage accidents. Another object is to enable the hydraulic circuit to be used even at a liquid pressure lower than the gas charging pressure of the accumulator.

[0009]

The present invention relates to an accumulator in which the inside of a container is partitioned into a gas chamber and a liquid chamber by a separating member, and the liquid chamber communicates with a fluid passage through a connecting passage; A check valve is provided in the passage, the connecting passage is composed of an inlet-side connecting passage and an outlet-side connecting passage that are separated from each other, the inlet-side connecting passage is connected to the primary side of the check valve, and the outlet-side is connected to the secondary side. An accumulator with a check valve, characterized in that a connecting path is connected.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A partition gas chamber and a liquid chamber are formed in a container portion of an accumulator by a separating member, for example, a diaphragm, a bladder, a rigid piston, or a metal bellows made of an elastic material.

The accumulator is connected to the liquid passage via a connecting passage. A check valve is provided in the liquid passage. The primary side of this check valve communicates with the liquid chamber via the inlet side connecting passage, and the secondary side communicates with the liquid chamber via the outlet side connecting passage. The two communication passages are formed separately at intervals, but the number, shape, diameter, position, etc. of them are appropriately selected as necessary.

A valve body, for example, a poppet valve, for protecting the separating member may be provided on the liquid chamber side of both connecting paths. In this case, it is not necessary to provide both connecting paths,
You may provide in either one.

In the vicinity of the valve seat of this valve body, a drain hole for preventing liquid from being enclosed may be formed. It is not always necessary to provide the drain holes around the entire circumference in the vicinity of both valve seats. For example, a plurality of drain holes may be provided in the vicinity of one valve seat at intervals in the circumferential direction.

[0014]

First Embodiment A first embodiment of the present invention will be described with reference to FIG. The accumulator ACC is a container unit 1 provided on the base B.
And a lid member 2 for closing the container portion 1.

A fluid passage W is provided in the base B, and a check valve 9 is provided in the fluid passage W. The cracking pressure of the check valve 9, that is, the opening pressure of the check valve 9 is set to, for example, 0.7 to 5 kg / cm ² . At both ends of the liquid passage W, connecting means, for example, screws SC are provided. The check valve 9 includes a frustoconical head portion 9A having a through hole 9a, a cylindrical spring chamber 9B that houses the coil spring 10, and a spring stop portion 11. The check valve 9 is not limited to this type, and other valves such as a ball valve and a butterfly valve may be used.

The diameter d1 on the primary side of the liquid passage W, that is, on the inlet 13 side is formed smaller than the diameter d2 on the secondary side, that is, the outlet 12 side. The diameters d1 and d2 are as required. It is selected appropriately.

The primary side 14 of the fluid passage W communicates with the liquid chamber 6 via the inlet side connecting passage 7, and the secondary side 15 communicates with the liquid chamber 6 via the outlet side connecting passage 8. Entrance side connecting path 7
The outlet-side connecting passages 8 are provided at intervals.

The interval, the number, the shape, the diameter, etc. of the connecting passages 7, 8 are appropriately selected according to need. For example, seven inlet side connecting passages 7 and outlet side connecting passages 8 having the same diameter are provided.
The distance LM between the inner inlet side communication path 7a and the inner outlet side communication path 8a may be made wider than the distance LN between the other communication paths.

The diaphragm 4 constituting the separating member is made of natural rubber or the like, and its flange portion 4a is held between the container portion 1 and the lid body 2. The diaphragm 4 divides the inside of the container 1 into a gas chamber 5 and a liquid chamber 6.
Gas is sealed in the gas chamber 5 through the air supply plug 3 at a predetermined pressure.

Next, the operation of this embodiment will be described.
When the pressure liquid A is supplied to the liquid passage W from a pump (not shown), when the pressure of the pressure liquid A is higher than the pressure of the gas enclosed in the gas chamber 5, the inlet side communication passage 7 flowing into the inlet 13 of the fluid passage W is It flows into the liquid chamber 6 through it, receives the action of pulsation absorption, etc., and goes to the outlet side communication path 8. After that, the liquid A is discharged through the outlet side communication passage 8 to the secondary side 15 with a pressure loss, and is supplied to an actuator or the like (not shown).

At this time, when the difference between the pressure on the primary side and the pressure on the secondary side of the fluid passage W does not reach the cracking pressure of the check valve 9, the check valve 9 maintains the closed state. Therefore, all the liquid A flowing in the liquid passage W passes through the liquid chamber 6 of the accumulator ACC and is sufficiently supplied to the actuator and the like after being subjected to an action such as pulsation absorption.

On the other hand, when the difference between the pressure on the primary side and the pressure on the secondary side of the fluid passage W reaches the cracking pressure of the check valve 9, the check valve 9 is pressed toward the outlet 12 side and opens. The pressure liquid A on the primary side 14 directly flows out to the secondary side 15 through the through hole 9a. Therefore, the pressure liquid A on the primary side
Is supplied to the secondary side by being divided into a system that flows through the inlet-side connecting passage 7, the liquid chamber 6, and the outlet-side connecting passage 8 and a system that flows through the through hole 9a. Even if it flows, an appropriate amount of fluid will flow in the accumulator and will not have an abnormally high pressure, so that no damage accident will occur.

When the gas charging pressure of the accumulator is made higher than the cracking pressure of the check valve, even if a liquid having a pressure lower than the charging pressure flows to the primary side, the check valve opens and directly flows to the secondary side. Therefore, a low pressure liquid can be used without using an accumulator.

Further, when a shock wave is generated on the actuator side, the secondary side pressure liquid of the accumulator presses the check valve 9 in the closing direction, that is, the primary side 14 and closes the liquid passage W, so that the accumulator inside. The shock wave is not transmitted because it flows into the primary side. Therefore, it is possible to prevent damage accidents such as the pump on the primary side.

[0025]

[Second Embodiment] A second embodiment of the present invention will be described with reference to FIG. 2. The difference between this embodiment and the first embodiment is as follows. (1) The separating member is a pleated bladder formed in a bag shape with an elastic member such as rubber or synthetic resin, and a plurality of meat pressure portions extending in the axial direction at intervals in the circumferential direction are formed.
Be easy to fold.

(2) Inlet side connecting passage 27 and outlet side connecting passage 2
8 is formed one by one, and a valve body for protecting the bladder 24, for example, a poppet valve 21 is provided on the liquid chamber 26 side. This poppet valve 21
Need not be provided in both connecting paths 7 and 8, but may be provided in one of them, for example.

(3) The poppet valve 21 is provided with the drain hole 23 near the valve seat 25 and the poppet valve 21 is provided with the cushion cup 29. The liquid drain hole 23 prevents the liquid from remaining in the liquid chamber 6 when the valve is closed, and its installation position can be appropriately selected as necessary. For example, it is provided as a gap around the outer periphery of the valve seat 25, or the valve is closed. A plurality of seats 25 may be provided at intervals in the circumferential direction. The cushion cup 29 is provided so that the liquid drain hole 23 is not closed, that is, a gap is formed between the bottom surface 6a of the liquid chamber 6 and the bladder 24, and is made of an elastic material such as rubber. It is made of plastic or the like. The shape and the like are appropriately selected as needed.

[0028]

Third Embodiment A third embodiment of the present invention will be described with reference to FIG. The difference between this embodiment and the second embodiment is as follows. (1) The separating member is a metal bellows 30.
One end of the fold wall 37 of the bellows 30 has a bellows lid 31.
, And the other end is sealed in a lid 32 having an air supply plug 33. The bellows 30 divides the interior of the container portion 34 into a gas chamber 35 and a liquid chamber 36. (2) No drain hole for removing the residual liquid is formed near the valve seat 25 of the poppet valve 21. However, it is needless to say that in this embodiment, the liquid drain hole may be provided as in the case of the above embodiment.

[0029]

Fourth Embodiment A fourth embodiment of the present invention will be described with reference to FIG. The difference between this embodiment and the second embodiment is as follows. (1) The separating member is the piston 44 formed on the base B, and the container portion is the cylinder 41. (2) Inlet-side passage 47 and outlet-side passage 48 on the liquid chamber 46 side
No poppet valve is installed in.

[0030]

The present invention has the following remarkable effects. (1) Since a check valve is provided in the liquid passage, if an unexpected flow rate flows on the primary side, the check valve opens, part of the pressure liquid on the primary side passes through the accumulator, and the other directly on the secondary side. Drain to. Therefore, since an appropriate amount of liquid can be passed through the accumulator, the accident of damaging the accumulator does not occur.

(2) When a shock wave is generated on the secondary side, the check valve is closed, and the shock wave is not transmitted to the primary side because it flows into the accumulator and flows to the primary side. Therefore, the drive source on the primary side is not subjected to abnormally high pressure, and is not damaged.

(3) If the gas charging pressure of the accumulator is made higher than the cracking pressure of the check valve, even if a liquid having a pressure lower than the charging pressure flows to the primary side, the check valve opens and directly flows out to the secondary side. To do. Therefore, a low pressure liquid can be used without using an accumulator.

(4) The connecting passage is composed of an inlet-side connecting passage and an outlet-side connecting passage which are separated from each other, the inlet-side connecting passage is connected to the primary side of the check valve, and the outlet-side connecting passage is connected to the secondary side. Therefore, the pressure liquid that has flowed into the liquid chamber from the inlet side connecting passage is sufficiently discharged while absorbing the pulsation while flowing in the liquid chamber, and then discharged from the outlet side connecting passage to the secondary side. For that reason,
As compared with the conventional example, the action such as pulsation absorption can be sufficiently obtained, resulting in an efficient accumulator.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment of the present invention.

FIG. 3 is a vertical sectional view showing a third embodiment of the present invention.

FIG. 4 is a vertical sectional view showing a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container part 4 Diaphragm 5 Gas chamber 6 Liquid chamber 7 Inlet side connecting passage 8 Outlet side connecting passage 9 Check valve 12 Outlet 13 Inlet 14 Primary side 15 Secondary side 21 Poppet valve 23 Liquid drain hole 24 Bladder 30 Bellows B Base material

Claims (6)

[Claims] 1. An accumulator in which the interior of a container is divided into a gas chamber and a liquid chamber by a separating member, and the liquid chamber communicates with a fluid passage through a connecting passage; a check valve is provided in the fluid passage, The connecting path includes an inlet-side connecting path and an outlet-side connecting path that are separated from each other, the inlet-side connecting path is connected to the primary side of the check valve, and the outlet-side connecting path is connected to the secondary side. An accumulator with a check valve characterized in that 2. The accumulator with a check valve according to claim 1, wherein at least one of the two connecting passages comprises a plurality of passages. 3. The accumulator with a check valve according to claim 1, wherein at least one of the two connecting passages is provided with a valve body for protecting the separating member. 4. A liquid drain hole for preventing liquid sealing is formed near the valve seat of the valve body.
Accumulator with check valve described. 5. The accumulator with a check valve according to claim 1, wherein the container portion, both connecting passages and the fluid passage are formed in one base. 6. The accumulator with a check valve according to claim 5, wherein connecting portions are provided at both ends of the fluid passage.