JPH047366Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to an accumulator used for accumulating, buffering, etc. pressure liquid.
This invention relates to an accumulator with an umbrella-shaped sensor that detects accumulation of a specified amount of liquid in a container body using a sensor provided in a bladder.

BACKGROUND OF THE INVENTION A bladder-type acumulator has a bladder airtightly installed inside a container body, gas is filled in the bladder, and liquid is moved into and out of the container body against the gas pressure inside the bladder. The amount of liquid accumulated inside the container body is calculated indirectly from the pressure change under certain conditions of the liquid, but if there is a change in these conditions due to a gas leak, for example, the amount accumulated inside the container body will also increase. In consideration of this, more accumulators were placed than required. Furthermore, if more liquid than the specified amount enters the container body, the bladder will be compressed beyond the allowable compression limit and will be pushed into the air supply port of the lid, causing damage to the bladder.

If the bladder is damaged in this manner, gas leakage will occur and the accumulator will be unable to store and buffer the pressurized liquid, resulting in a fatal defect for the accumulator.

Conventionally, a holder that protrudes into the bladder is provided on the lid of the container body, and a detector is provided at the tip of the holder, and when the bladder approaches or contacts the detector, the ultrasonic waves emitted by the detector are reflected. , the reflected wave is detected and a signal is emitted (Unexamined Japanese Patent Publication No.
60-159401).

Problems that the invention aims to solve In conventional bladder-type accumulators, the switch operates when the oil level is set, so the accumulated amount can be detected, but when the operating pressure of the accumulator increases,
Ultrasonic detection may become impossible or inaccurate, causing the accumulator to malfunction and causing bladder damage. Also, the detector (sensor) at the tip of the holder
The bladder may be damaged by being pressed against it. In view of the above circumstances, it is an object of the present invention to provide a bladder-type accumulator that uses a sensor to prevent damage to the bladder and to accurately detect the amount of liquid accumulated in the container body over a long life.

Means for Solving the Problems The present invention provides a bladder type accumulator in which a holder that protrudes into the bladder is provided on the lid of a container body, and a sensor for detecting the amount of accumulated liquid is provided in the holder. A bladder-type accumulator with an umbrella-shaped sensor, comprising a first sensor and a second sensor spaced apart from each other in the axial direction, and both sensors are formed of a bowl-shaped elastic body that can be opened and closed. This aims to achieve the above objective.

Action When liquid enters the container body, the bladder is pushed by the liquid pressure and contracts, and when it reaches the lowest liquid level, the first
Press the sensor to activate the first switch.
Then, the fluid amount increases and the second sensor is pressed at the position of the set oil amount of the accumulator to operate the second switch.

Embodiment An embodiment of the present invention will be described with reference to the accompanying drawings, in which the same reference numerals have the same names and functions.

In FIG. 1, reference numeral 1 denotes a container body, which is made of a rigid material such as metal and has a shape with high pressure resistance.

A bladder 2 is inserted into the container body 1 in the axial direction from the upper opening, and its flange portion 3 is sandwiched between the container body and the lid 4.

The bladder 2 is made of a soft elastic material such as rubber, and has columnar pleats formed on its inner surface.

A housing portion 6 for the rod 5 is formed in the center of the lid 4, and this housing portion 6 communicates with a gas supply port 7.

One end of the rod 5 is fixed to the lid 4, and the center part of the inner surface of the bowl-shaped elastic body 9 of the first sensor 8 is fixed to the other end.

A sliding rod 10 is disposed on the outer periphery of the rod 5, and an actuator 11, for example a magnet, is provided at one end of the sliding rod 10.
The other end is linked to the inner surface of the bowl-shaped elastic body 14 of the second sensor 13 via the support rod 12 .

The center part of the bowl-shaped elastic body 14 of the second sensor 13 is
It penetrates and is fixed to an auxiliary sliding rod 15, and the auxiliary sliding rod 15 is linked to the inner surface of the bowl-shaped elastic body 9 of the first sensor 8 via a support rod 16. One end of the auxiliary sliding rod 15 is brought into contact with the sliding rod 10 to restrict the rotation of the support rod 12 to prevent the bowl-shaped elastic body 14 of the second sensor 13 from opening too much, and to prevent the auxiliary sliding rod from opening too much. A stopper 17 that engages with the stepped portion 16a of the rod 5 is formed in the center of the rod 15 to restrict rotation of the support rod 16 and prevent the bowl-shaped elastic body 9 of the first sensor 8 from opening too much. There is.

18 is a mounting part of the switch, and this mounting part 18
There is a first switch 19 that operates when the liquid level is at the lowest level.
A second switch 20 is provided which operates at the maximum fluid level, that is, at the limit of allowable compression of the bladder.

The switches 19 and 20 are magnetic proximity switches activated by the approach of the slider 11, but it goes without saying that micro switches, photoelectric switches, etc. may be used instead of these switches.

Reference numeral 109 denotes a liquid supply/discharge port, and a valve body 111 supported by a shaft 112 is provided inside. This valve body 111 opens due to the elasticity of the spring 110,
It is closed by pressing the bladder 2.

Next, the operation of this embodiment will be explained.

When gas is injected from the gas supply port 7, the gas passes through the accommodating portion 6 and is filled into the bladder 2, the bladder comes into close contact with the inner wall of the main body, and the gas is injected to a predetermined pressure.

At this time, the bowl-shaped elastic bodies 9, 14 of the sensors 8, 13
All of them have a natural bowl shape.

In this state, the actuator 11 faces the first switch 19 and operates the switch 19.

Next, when a pump (not shown) is operated and liquid from a tank (not shown) is forced into the liquid inlet/outlet 109, the bladder 2 is compressed and deformed by the liquid pressure, and the accumulated liquid level reaches the minimum liquid level. When it reaches A, it presses the bowl-shaped elastic body 9 of the first sensor 8 and moves the auxiliary sliding rod 15 to A.
Slide in 15 directions.

As the sliding rod 15 slides, the sliding rod 10 slides and the actuator 11 moves to the position 11A, so that the first switch 19 is turned off.

When the bladder further deforms to the set liquid level, the bladder enters the 2A state, presses the bowl-shaped elastic body 14 of the second sensor 14, and moves the sliding rod 10 further toward the arrow A15.
slide in the direction.

At this time, the actuator 11 changes from the state of 11A to 11A.
in state B, approaching the second switch 20,
A switch is activated to stop the pump and a predetermined amount of liquid is accumulated in the container body.

When the hydraulic system needs the liquid accumulated in the accumulator, a control valve (not shown) is opened to drain the accumulated liquid, but as the liquid is discharged, the pressure decreases and the plug is removed. gradually expands, the bowl-shaped elastic body 14 of the second sensor 13 moves toward the bladder 2 side while opening, and the supporting rod 1
2 moves, the sliding rod 10 moves in the direction opposite to the arrow A15, and the sliding rod 1 moves to the tip 20a of the auxiliary sliding rod 15.
The lower end 21 of the second sensor 13 contacts the support rod 12 to restrict the movement of the support rod 12, and prevents the bowl-shaped elastic body 14 of the second sensor 13 from opening too much. At this time, the actuator 11 moves from 11B to 11A.

At this time, the accumulated liquid is still accumulated in the accumulator, and when the liquid is discharged from the accumulator, the pressure decreases, so the bladder continues to expand.

The bowl-shaped elastic body 9 of the first sensor 8 moves toward the bladder 2 while opening, and the support rod 16 moves to form a stopper 17 in the center of the auxiliary sliding rod 15 that connects with the stepped portion 16a of the rod 5. The movement of the support rod 16 is restricted to prevent the bowl-shaped elastic body 9 of the first sensor 8 from opening too much.

At this time, the actuator 11 approaches the second switch 20 and operates the switch, starting the pump and accumulating the set liquid in the container body.

In this way, when the accumulation and discharge of the accumulator is repeated, the pressure and time at the time of accumulation and discharge are measured and the standard value is recorded, and the accumulated pressure at that time is compared with the standard value during daily operation, If the pressure has decreased, it can be seen that the sealing pressure in the bladder 2 has decreased, so when this state is reached, gas is replenished into the bladder 2 to bring it to the standard accumulated pressure.

Other Embodiments The present invention is not limited to the above-mentioned embodiments. For example, as shown in FIG.
communicates with the housing portion 106 of the support member 100,
The rod 5 and the sliding rod 10 may be made longer and the rod 5 may be fixed with a nut 107.

With this configuration, the positions of the sensors 8 and 13 can be adjusted freely.For example, if you want to use the accumulator A by increasing its operating pressure, that is, if you want to use it by increasing the pressure of the hydraulic circuit, move the rod 5 in the direction of the arrow A1.
All you have to do is move in the direction of 5. Also, when operating over a wide range, that is, when increasing the amount of storage, the first
The distance between the sensor and the second sensor may be increased.

Effects of the invention Since the invention has been achieved as described above, it has the following remarkable effects.

When the liquid pressure inside the container body increases, the bladder contracts and presses the first sensor of the bowl-shaped elastic body.
Since it is mechanically closed, the first sensor operates reliably.

Furthermore, when the hydraulic pressure increases, the bladder presses the second sensor of the bowl-shaped elastic body to mechanically close it, so that the second sensor operates reliably. In this way, when the fluid pressure inside the container body increases, the bladder
Since the first sensor and the second sensor are mechanically and reliably closed, unlike conventional ultrasonic detection, it is possible to accurately determine whether or not the amount of accumulated liquid in the accumulator has reached the minimum or maximum liquid level. Can be detected.

Since a bowl-shaped elastic body that can be opened and closed is used as the sensor, even if the bladder comes into contact with the sensor, it will not be damaged unlike the conventional example.

Furthermore, since the entire outer surface of the umbrella portion of the bowl-shaped elastic body contacts the bladder, the load per unit area is smaller than in the case of point contact.

Therefore, damage to the bladder can be prevented, and the service life of the accumulator can be extended.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of another embodiment, showing a part thereof. 1... Container body, 2... Bladder, 8... First sensor, 13... Second sensor, A... Accumulator.

Claims (1)

[Scope of utility model registration request] A bladder-type accumulator in which a holder is provided on the lid of the container body that protrudes into the bladder, and a sensor for detecting the accumulated amount is provided in the holder, and the sensor is
A bladder with an umbrella-shaped sensor, comprising a first sensor and a second sensor that are spaced apart in the axial direction of the holder, and both sensors are formed of a bowl-shaped elastic body that can be opened and closed. Form accumulator.