JPH0544561Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to, for example, a hydraulic operating device, particularly gas leak detection in a gas pressure accumulator thereof.

[Prior Art] Generally, a drive mechanism that uses hydraulic pressure such as hydraulic pressure is used as a drive source for equipment that performs linear or rotational motion at high speed, such as electric power switching equipment. FIG. 2 shows a conventional hydraulic operating device. In the figure, reference numeral 1 denotes an opening/closing part of a switch, for example, a breaker, which is composed of a fixed contact 2 and a movable contact 3, and is driven by a drive device 4 to open and close the contacts. The drive device 4 has a movable contact 3
It consists of a differential piston 6 having a rod 5 connected to it, and a cylinder 7, and a gasket 6a provides a liquid-tight seal between the two. A pipe line 8 connected to the head side (large area side) 7a of the cylinder 7 is attached to a hydraulic pressure control device 9, and a low pressure tank 10 is attached to this hydraulic pressure control device 9 via a low pressure pipe line 11. There is. Further, an accumulator 13 is connected to the rod side (small area side) 7b of the cylinder 7 via a high-pressure pipe 12, and a high-pressure pipe 14 communicating with the hydraulic pressure control device 9 is provided. Furthermore, a pump unit 1 that supplies high pressure liquid
5 connects the liquid discharged into the low pressure tank 10 to the pipe 1
7 and supplies the high pressure liquid to the accumulator 13 via a conduit 16. Pump unit 1
The high pressure liquid obtained in step 5 is stored in an accumulator 13. The accumulator 13 is divided into a gas filling chamber 13b (hereinafter referred to as a gas chamber) and a liquid filling chamber 13a (hereinafter referred to as a liquid chamber) by a piston 21 that is slidable within a cylinder 13c, which is a container. When liquid is supplied by the pump unit 15, high pressure liquid is stored in the liquid chamber 13a while compressing the gas in the gas chamber 13b.

When the piston 6 is driven upward in the drawing, the pressurized high-pressure liquid is introduced into the cylinder chamber 7b via the conduit 12, and is also introduced into the high-pressure liquid cylinder chamber 7a via the conduit 14 by the hydraulic pressure control device 9. Since there is a difference between the area of the piston 6 on the cylinder chamber 7a side and the area on the cylinder chamber 7b side by the diameter of the piston 6, the piston 6 moves upward due to the thrust generated by the difference in area. On the other hand, when the piston 6 is driven downward in the figure, the hydraulic pressure control device 9 discharges the high-pressure liquid in the cylinder chamber 7a to the low-pressure tank 10 via the pipe line 11 and prevents it from flowing in from the pipe line 14.

The accumulator 13 maintains a predetermined pressure in the gas chamber 13b, generally 70 to 90% of the minimum operating pressure of the switchgear.
The liquid is fed into the liquid chamber 13a, which is filled with gas at a pressure of , and partitioned by a piston 21, displacing the piston 21, compressing the gas in the gas chamber 13b, and storing energy. Gas chamber 13b of accumulator 13
has a structure that is sealed by the sealing member 22 of the piston 21, but due to slight gas leakage from the sealing part or gas dissolving into the liquid due to the reciprocating movement of the piston 21, the gas originally sealed in the gas chamber 13b may be The pressure gradually decreases. However, in the steady operation state of the switch etc., the gas chamber 13b
It is necessary to equalize the gas pressure inside and the liquid pressure in the liquid chamber 13a to position the piston 21 in an equilibrium state.
Therefore, a pressure switch 19 for monitoring the hydraulic pressure is provided, and the pump 15 is driven by the action of the pressure switch 19, and the piston 21 is displaced by the amount of pressure reduced due to leakage of gas, compressing the gas and keeping the hydraulic pressure constant. keep.

FIGS. 3a and 3b show a conventional gas leak detection device as disclosed in, for example, Japanese Patent Application Laid-open No. 52-48119 and Japanese Patent Application Laid-open No. 58-212021.

In the hydraulic operating device shown in FIG. 2, since the pressure drop due to gas leakage is automatically corrected by the action of the pressure switch 19, it is necessary to separately provide means for detecting gas leakage. Therefore, the third
In FIG.
The displacement of 1 is directly monitored from the outside. Gas chamber 13b
When the gas inside leaks and the piston 21 is displaced and reaches a predetermined position, the alarm device 34 is activated by closing the contact 43. Further, FIG. 3 shows that the cylinder 1 of the accumulator 13 is
The alarm device 34 is activated by opening and closing the contacts of the reed switch 52 provided on the outside of the reed switch 3c.

[Problems to be solved by the invention] In the conventional hydraulic operating device shown in FIG. Therefore, gas leakage cannot be detected in a steady state, and if more than a certain amount of gas leaks from the gas chamber 13b of the accumulator 13, the accumulator 13 can no longer function as an accumulator. Furthermore, when the gas leak detection device shown in FIG. 3a is used in the hydraulic operating device shown in FIG.
There is a problem that gas leaks into the atmosphere from the sliding part with the cylinder 13b of the accumulator 13.
must be made of a non-magnetic material such as stainless steel, which poses problems such as difficulty in processing and increased material costs.

This invention was made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a hydraulic operating device having a gas leakage detection means for detecting gas leakage into the liquid from the gas chamber of an accumulator. The purpose is

[Means for Solving the Problems] The hydraulic operating device according to this invention includes a vaporizer having a throttle and a vaporization chamber between the high pressure side and the low pressure side of a hydraulic circuit, and a gas detection device for detecting gas in the vaporization chamber. A detection device is provided.

[Operation] The gas leaking from the gas chamber side of the accumulator to the liquid chamber side and mixed into the high-pressure liquid is vaporized again when the high-pressure liquid is released to a low pressure through the throttle of the vaporizer. The vaporized gas is stored in the vaporization chamber, and the gas detection device detects when the gas stored in the vaporization chamber exceeds a predetermined amount and activates an alarm device or the like.

[Example] An example of the hydraulic operating device according to this invention will be described with reference to FIG. It is assumed that elements with the same numbers as those in the conventional example shown in FIG. 2 have the same functions. A vaporizer 31 is connected between the high pressure pipe 12 and the low pressure tank 10 via pipes 37 and 38.
is provided. The vaporizer 31 has a diaphragm 31a and a vaporization chamber 31b, and the diaphragm 31a has a vaporization chamber 31b.
and the high pressure side pipe line 37. A float 32 is provided within the vaporization chamber, and the float 32 is connected to a contact 32 for activating an alarm circuit 34. Further, a gas detector 36 is connected to the vaporization chamber 31b via a valve 35.

The orifice 31a of the vaporizer 31 has an extremely small diameter orifice (for example, the pressure drop due to the liquid on the high pressure side being released to the low pressure side through the orifice is extremely small, and the liquid pressure on the high pressure side is reduced by the operation of the pump unit 15). The vaporizing chamber 31b is always kept at a low pressure by the aperture 31a, and its inside is filled with a low-pressure liquid. The seal member 22 of the piston 21 from the gas chamber 13b of the accumulator 13
It is assumed that gas is dissolved in the high-pressure liquid on the liquid chamber 13a side via the liquid chamber 13a. When the high-pressure liquid containing this gas flows into the low-pressure side vaporization chamber 31 through the throttle 31a, the gas dissolved in the liquid vaporizes again in the vaporization chamber 31b, becomes bubbles, and accumulates in the upper part of the vaporization chamber 31b. Further, the low-pressure liquid is sent from the vaporization chamber 31b to the low-pressure tank 10 through the pipe line 38 due to the pressure of the vaporized gas. When the vaporized gas accumulates in the upper part of the vaporization chamber 31b, the vaporization chamber 3
The liquid level on the low pressure side in 1b is lowered, and the float 32 is also lowered accordingly. When the float 32 descends, the contact 33 connected to the float 32 closes, and the alarm circuit 34 becomes conductive to issue a gas leak alarm.

However, in general, in addition to gas, air is dissolved in the liquid, and in the method described above in which the amount of gas vaporized in the vaporization chamber 31b is detected and the alarm circuit is activated, air is dissolved in the liquid. If there is a large amount of air, the system will issue a gas leak alarm even if the amount of gas leaking is not that large. Therefore,
In this invention, a gas detector 36 is further provided in the upper part of the vaporization chamber 31b via a valve 35, and the gas 23 sealed in the gas chamber 13b of the accumulator 13 is detected as a tracer such as SF ₆ gas or helium gas. Mixed. The valve 35 is released and the gas accumulated in the vaporization chamber 31b is detected by the gas detector 3.
By introducing the gas into 6 and analyzing the gas components, the air that was mixed in the liquid from the beginning and the accumulator 1 were analyzed.
The gas chamber 13b of the accumulator 13 can be separated with high accuracy from the gas leaking from the gas chamber 13b of the accumulator 13.
It is possible to detect gas leaks from In particular, if SF ₆ gas is used as a tracer, SF ₆ gas is also used as an insulating gas in switchgear etc. in which this hydraulic operating device is used, and these switchgears are equipped with gas leak detectors for SF ₆ gas. , it is possible to use these gas leak detectors as well.

In the embodiment described above, the alarm circuit 34 does not operate until a certain amount of vaporized gas accumulates in the vaporization chamber 31b, but a combination of a throttle and a valve is used in place of the throttle 31a, and the valve is activated at regular intervals. It may be configured to release the liquid on the high pressure side to the low pressure side and detect the gas component in the gas mixed in the liquid.

It goes without saying that the valve can be automatically controlled by a control device (not shown), and gas leakage can be automatically detected.

[Effects of the invention] As described above, according to this invention, the gas leaking from the accumulator into the high-pressure side liquid and dissolved in the liquid is vaporized and detected by the vaporizer installed in the hydraulic circuit. There is no need to provide a special device for detecting the position of the piston 21, and gas leakage can be automatically detected even during steady operation of the opening/closing device in which this hydraulic operating device is used. .

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the hydraulic operating device according to this invention, Fig. 2 shows a conventional hydraulic operating device, and Fig. 3 a and b show a conventional gas leak detection device. It is. In the figure, 9 is a hydraulic control device, 15 is a pump unit, 31 is a vaporizer, 31a is a throttle, 31b is a vaporization chamber, 32 is a float, 33 is a contact, 34 is an alarm circuit, 35 is a valve, and 36 is a gas detector. It is.

Claims (1)

[Claims for Utility Model Registration] (1) A high-pressure side liquid circuit for driving an output means using a liquid pressurized by a gas-pressure accumulator, and a system for reducing the pressure of the liquid due to gas leakage from the gas-accumulator. a liquid amount adjusting means for adjusting the liquid amount in the high pressure side liquid circuit in order to keep the pressure of the liquid constant; and a liquid amount adjusting means for adjusting the liquid amount in the high pressure side liquid circuit by the liquid amount adjusting means. a low-pressure side liquid circuit having a liquid storage means for storing unpressurized liquid; a vaporizing means provided between the high-pressure side liquid circuit and the low-pressure side liquid circuit and having at least a throttle and a vaporizing chamber; A hydraulic operating device comprising: gas detection means for detecting gas vaporized by the vaporization means; (2) The hydraulic operating device according to claim 1, wherein the gas detection means comprises a float provided in the vaporization chamber and an alarm device activated in conjunction with the position of the float. . (3) The hydraulic operating device according to claim 1, wherein the gas detection means includes a valve provided in the upper part of the vaporization chamber and a gas detector connected through the valve. . (4) The gas detection means is connected to a float provided in the vaporization chamber, an alarm device activated in conjunction with the position of the float, and a valve provided in the upper part of the vaporization chamber via the valve. The hydraulic operating device according to claim 1, which is comprised of a gas detector. (5) The hydraulic operation according to claim 3 or 4, wherein SF ₆ gas or helium gas, which can be detected by the gas detector, is mixed as a tracer into the working gas of the gas pressure accumulator. Device.