JPH0453443Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an accumulator with a bladder position detection member, and in particular, an accumulator with a bladder position detection member that prevents malfunction of the detection member and does not damage the bladder. It is related to.

[Prior art and its problems]

Conventionally, in the case of an accumulator with a bladder position detection member, a push rod is provided on the side of the gas-filled pressure chamber that protrudes from a sliding hole provided at a position facing the bladder and moves together with the bladder when the pressure of the bladder is activated. There is a known device equipped with a detection member that detects when the push rod reaches a predetermined position and issues a signal.

However, regarding the operation of the push rod of the conventional accumulator with a bladder position detection member, as a means for returning the sliding push rod to the original position, which is the non-operating position of the bladder,
Most of the damage was due to free fall.

In the above-mentioned device that returns the push rod to its original position by free fall, the push rod and the sliding hole are loosely fitted to eliminate frictional resistance. There was a problem in that the bladder moved within the sliding hole and the detection member was activated, causing false detection when the bladder was not activated.

In addition, since components such as the detection member are exposed on the side of the gas-filled pressure chamber, when pressure is applied to the bladder and it moves, the bladder comes into contact with the exposed components and is damaged. This had the problem of reduced durability.

The present invention solves the problems of the conventional devices as described above, and is capable of reliably detecting the position of the bladder only when it moves. It is an object of the present invention to provide an accumulator with a bladder position detecting member that can improve the durability of the bladder by preventing it from being damaged.

[Means for solving problems]

In order to solve the above problems, the present invention divides a hollow shell into two chambers each having a bladder, one chamber is a gas-filled pressure chamber, and the other chamber is a pressure-operated chamber connected to a pressure flow path. and a push rod which is movable up and down and is normally held in a downward position by a protective member made of an elastic material, and a detection member located near the push rod are disposed in the gas-filled pressure chamber. , when pressure is applied to the pressure working chamber and the bladder rises, the push rod rises against the elastic protection member;
When the push rod is raised to a predetermined position, the detection member emits a signal, and the protective member made of elastic material is bowl-shaped and fixes the lower end of the push rod at the center of the bottom surface, and also controls the gas filling pressure. The open end of the elastic protective member may be provided in contact with the tapered surface provided on the lower surface of the gas port provided in the chamber, or the lower end of the push rod may be fixed to the center of the bottom surface, and a flange may be attached to the open end. The flange portion is provided so as to be fitted and fixed into a fitting groove at the bottom of a gas port provided in the gas-filled pressure chamber.

[Effect]

By adopting the above-mentioned configuration, the push rod, which is an auxiliary member for detecting the position of the bladder, is normally held at a lower position within the sliding hole and does not move freely, so that the bladder does not move. There is no need to worry about false detection during operation, and since the exposed components such as the detection member are covered and protected, and the push rod returns to its original downward position, the push rod can be moved without damaging the bladder. This means that it can be returned to its original position and operated reliably.

〔Example〕

Embodiments of the present invention shown in the drawings will be described below.

FIG. 1 is an explanatory cross-sectional view of an accumulator with a bladder position detection member according to the present invention, and FIG. 2 is an enlarged explanatory view of the main part of FIG. 1.

The accumulator with a bladder position detecting member according to the present invention shown in the same figure has a hollow, almost spherical shell 1, and a holding member 3 having an annular peripheral edge, which holds a bladder made of a rubber-like elastic material and having a medium-high corrugated cross section. 2 is held, and the inside of the shell 1 is moved by this bladder 2.
A pressure-operated chamber 5 is divided into chambers in a sealed state, one of the upper chambers is a gas-filled pressure chamber 4, and the other lower chamber is connected to a pressure passage (not shown).
is formed.

A port member 7 in which a communication hole 6 connected to the pressure flow path is formed is attached to the lower part of the shell 1 on the pressure working chamber 5 side.

On the other hand, at the top of the shell 1 on the side of the gas-filled pressure chamber 4, a protective member 21 made of an elastic material protrudes from a sliding hole 8 provided at a position facing the bladder 2, and is movable up and down. A gas port 10 is mounted with a push rod 9 which is held in a lower position by.

The protective member 21 made of elastic material is made of an elastic material such as rubber and molded into a bowl shape in order to return the push rod 9 to its original position, which is a downward position, and has a hole in the center of the bottom surface thereof through which the push rod 9 is inserted. 22 and a communication hole 23 for gas escape at an appropriate location near the hole 22, with the lower surface facing the bladder 2 side and the upper opening end 24 abutting against the lower surface of the gas port 10. Then, insert the lower end of the push rod 9 into the hole 22 and insert the upper fitting 25.
When pressure is applied to the pressure working chamber 5 and the bladder 2 rises, the push rod 9 rises against the protective member 21 made of elastic material. The open end 24 of the protective member 21 is further deformed to cover the lower surface of the gas port 10, and protects the bladder 2 from coming into direct contact with the gas port 10. The push rod 9 is lowered by the restoring force of the protective member 21 made of elastic material to return to its original bowl-shaped shape, and under normal conditions with no pressure applied, the elastic material completely returns to its original bowl-shaped shape. The push rod 9 is held in its original downward position by the protective member 21 made of metal.

A gas filling hole 11 communicates with the upper end of the sliding hole 8 of the gas port 10, and a gas plug 12 is fitted into this hole 11.

Furthermore, the gas port 10 is provided with a communication hole 13 that communicates the upper part of the sliding hole 8 with the gas-filled pressure chamber 4 and serves as a gas escape when the push rod 9 moves up and down. The lower surface of the gas port 10 is formed into a tapered surface 10a so as to assist the deformation and return of the protective member 21 made of elastic material.

The push rod 9 is provided with an O-ring 14 in an annular groove 15 formed on the outer periphery, which is the sliding portion of the push rod 9, and a slide hole 8 of the gas port 10 through which the push rod 9 slides in and out.
When the bladder 2 is inoperative, that is, the push rod 9 is in its original position, which is the inoperative position.
An engagement groove 16 into which the ring 14 engages is provided, and a stopper 17 is provided to prevent the push rod 9 from slipping downward.

Further, a magnet 18 is disposed above the push rod 9, and a reed switch 19 is buried in the gas port 10 in parallel with the sliding hole 8, and the magnet 18 and the reed switch 19 are used for detection. When the bladder 2 is moved upward by the pressure applied to the pressure working chamber 5 and the push rod 9 is moved upward to a predetermined position in the sliding hole 8, A reed switch 19 is actuated by the magnet 18, and acts as a detection member 20 that emits a signal.

In the accumulator with a bladder position detection member according to the present invention configured as described above, the gas-filled pressure chamber 4 is filled with a gas such as nitrogen gas through the hole 11, and a predetermined amount of gas such as nitrogen gas is filled in the gas-filled pressure chamber 4 through the hole 11. The sealing pressure is reached.

Further, the pressure working chamber 5 is connected to a pressure flow path (not shown) through a communication hole 6 of the port member 7, and the fluid pressure in the pressure flow path is lower than the filling pressure of the gas filling pressure chamber 4. That is, in a normal state, the pressure of the gas sealed in the gas-filled pressure chamber 4 presses the bladder 2 toward the pressure-operated chamber 5, and as a result, the bladder 2 is pressed downward within the shell 1. A poppet 22 fixed to the center of the lower surface of the bladder 2 closes the communication hole 6 of the port member 7.

When the fluid pressure in the pressure channel becomes higher than the filling pressure in the gas-filled pressure chamber 4, the fluid flowing in from the communication hole 6 pushes the bladder 2 upward against the filling pressure in the gas-filled pressure chamber 4. The volume of the pressure working chamber 5 is expanded, the gas-filled pressure chamber 4 is compressed, and when the pressure in the gas-filled chamber 4 is balanced, the bladder 2 stops rising. In Figure 1,
This shows a state in which the bladder 2 is balanced at a position where the interior of the shell 1 is divided into two approximately at the center, and if the pressure in the pressure channel is high, the bladder 2 will rise to the position indicated by the dashed-dotted line. .

At this time, the bladder 2 moving upward pushes the push rod 9 located opposite to its upper surface into the slide hole 8, and pushes the magnet 18 disposed at the upper end of the push rod 9 upward.
When the magnet 18 is at a predetermined upper position, the reed switch 19 in the gas port 10 is turned on and a signal is sent to the outside, thereby detecting that the bladder 2 is at the upper position.

In the accumulator with bladder position detection member according to the present invention, the push rod 9
However, since the push rod 9 is normally held at a lower position in the sliding hole 8 by the elastic protective member 21, the push rod 9 does not move freely even when subjected to vibrations or shocks from the outside of the accumulator, so there is no risk of false detection by the detection member 20. In addition, an O-ring 14 is provided on the sliding portion of the push rod 9, and an engagement groove 16 that engages with the O-ring 14 is provided.
Since the slide hole 8 is provided with a recess 8a, the push rod 9 can be easily held in the original position, which is the inoperative position.

Further, when the push rod 9 is in its original position, the protective member 21 made of an elastic material provided at the tip of the push rod 9 on the bladder 2 side has a vertically long teacup shape as shown by the solid line in FIG. When pressure is applied and the push rod 9 is pushed up in the state shown by the dashed line, the vertically long teacup shape transforms into a shallow dish shape, completely covering the gas port 10 that includes the detection member 20 and the like. This prevents the bladder 2 from coming into contact with the gas port 10 and being damaged. Since the original shape of the protective member 21 made of elastic material is the shape of the vertically long teacup, its elasticity ensures that the push rod 9 returns to its original position, which is the non-operating position, when returning to its original shape. It is.

FIG. 3 is a cross-sectional explanatory view showing another example of the accumulator with a bladder position detection member according to the present invention.

Another accumulator with a bladder position detection member according to the present invention shown in the same figure is shown in the above embodiment, but the lower surface of the gas port 10 is tapered, and the opening of the protective member 21 made of an elastic material is formed on this tapered surface 10a. Instead of the structure in which the end portion 24 slides, the cylindrical lower end of the gas port 10 is made to slightly protrude into the gas-filled pressure chamber 4, and an annular fitting groove 10b is formed on the side surface of the gas port 10. The elastic material is shaped into a bowl shape, and the open end 3
4 is slightly extended inward to form a flange portion 36. The flange portion 36 of this elastic material protection member 31 is fitted into the fitting groove 10b of the gas port 10. The structure is such that they are fixed together.

The protective member 31 made of elastic material has a hole 32 in the center of the lower surface through which the push rod 9 is inserted;
A communication hole 33 for gas escape is provided at an appropriate location near this hole 32, the lower end of the push rod 9 is inserted into the hole 32, and the protective member 31 made of an elastic material is secured to the lower end of the push rod 9 using a stopper 35. This is the same as in the previous embodiment.

In this embodiment, the annular groove 15 formed in the outer circumferential surface, which is the sliding part of the push rod 9, the O-ring 14 disposed in the annular groove 15, and the sliding hole 8 shown in the previous embodiment are used. Although the engaging groove 16 formed on the side is omitted, it goes without saying that a similar structure may be adopted in this embodiment as well.

Further, the other structures are completely the same as those of the previous embodiment.

In the bladder position detecting member accumulator of another example of the present invention having the above-mentioned configuration, the push rod 9 is pushed up as the bladder 2 rises, and the sensing member 20 detects that the bladder 2 is The presence of the upper position can be reliably detected, and since the push rod 9 is normally held at the lower position, the push rod 9 does not move freely even due to vibrations, shocks, etc. from outside the accumulator. There is no fear of false detection by the detection member 20.

Further, when the push rod 9 is normally in the lower position, the protective member 31 made of elastic material
Although it has the shape of a vertically long hot water bowl as shown by the solid line in FIG. As a result, as shown in the figure, the bag deforms into a crushed shape, completely covering the gas port 10 that includes the detection member 20, etc., and causing the bladder 2 to come into contact with the gas port 10 and damage it. is prevented. When the bladder 2 moves downward, the resilience of the protective member 31 made of elastic material causes the push rod 9 to return to its original shape.
In a normal state in which the push rod 9 is lowered and no pressure is applied, the push rod 9 is reliably held at the lower position shown by the solid line. At this time, compared to the above-mentioned embodiment, in this embodiment, the protective region 31 made of elastic material is also fixed at the flange portion 36 of the open end 34, so that the holding state of the push rod 9 is further stabilized. The vertical movement can be made more stable and reliable, and the detection accuracy can be improved.

[Effect of idea]

By configuring the present invention as described above, the push rod, which is an auxiliary member for detecting the position of the bladder, does not move freely within the sliding hole even due to vibrations or shocks from outside the actuator. There is no need to worry about false detection when the
In addition, even when pressure is applied to the bladder and it is pushed up, the protective member made of elastic material completely covers the exposed components such as the detection member, preventing the bladder from coming into direct contact with the components and causing damage. The durability of the bladder is improved by preventing this, and the elasticity of the elastic protection member ensures that the push rod returns to its original position, which is the inoperative position, thereby providing an inexpensive and simple means of returning the push rod. It has excellent effects such as:

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view of an accumulator with a bladder position detecting member according to the present invention, Fig. 2 is an enlarged explanatory view of the main part of Fig. 1, and Fig. 3 is a cross-sectional explanatory view of another accumulator with a bladder position detecting member according to the present invention. It is a diagram. DESCRIPTION OF SYMBOLS 1... Shell, 2... Bladder, 3... Holding member, 4... Gas-filled pressure chamber, 5... Pressure operation chamber,
6, 13, 23, 33...Communication hole, 7...Port member, 8...Sliding hole, 9...Push rod, 1
0...Gas port, 10a...Tapered surface, 10b
... Fitting groove, 11, 22, 32 ... Hole, 12 ...
Gas plug, 14... O-ring, 15... Annular groove, 16... Engagement groove, 17... Stopper, 18...
...Magnet, 19...Reed switch, 20...
...Detection member, 21, 31...Elastic material protection member,
22... Poppet, 24, 34... Open end, 2
5, 35...stopper, 36...flange portion.

Claims (1)

[Claims for Utility Model Registration] (1) A bladder 2 is arranged in a hollow shell 1 to divide it into two chambers, one of which is a gas-filled pressure chamber 4,
The other chamber is a pressure operating chamber 5 connected to the pressure flow path, and the gas-filled pressure chamber 4 is provided with a protective member 21 made of an elastic material, which is movable up and down and in a normal state.
A push rod 9 held in a lower position by a push rod 9 and a detection member 20 located near the push rod 9 are disposed, and when pressure is applied to the pressure operating chamber 5 and the bladder 2 rises, , the push rod 9 rises against the elastic protection members 21 and 31, and when the push rod 9 rises to a predetermined position, the detection member 20
An accumulator with a bladder position detection member, characterized in that it emits a signal. (2) The protective member 21 made of elastic material is bowl-shaped, and fixes the lower end of the push rod 9 to the center of the bottom surface, and also has a tapered surface 1 provided on the lower surface of the gas port 10 provided in the gas-filled pressure chamber 4.
2. The accumulator with a bladder position detecting member according to claim 1, wherein the open end portion 24 of the protective member 21 made of an elastic material abuts on the bladder position detecting member 0a. (3) The protective member 31 made of elastic material has a bowl-shaped shape, and the lower end of the push rod 9 is fixed to the center of the bottom surface, and a flange portion 36 is provided at the open end portion 34, and this flange portion 36 is used to fill the gas. 2. The accumulator with a bladder position detection member according to claim 1, wherein the accumulator is fitted and fixed in a fitting groove 10b provided at a lower part of a gas port 10 provided in the pressure chamber 4.