JPS5937720Y2 - Temperature compensated pressure detection device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a temperature-compensated pressure detection device for detecting gas pressure in, for example, a gas-insulated electrical device.

Generally, in gas-insulated electrical equipment filled with an arc-extinguishing medium such as SF6 (sulfur hexafluoride) gas, a temperature-compensated pressure detection device is used to constantly monitor the gas pressure in order to maintain a predetermined gas density. When the gas density of the device decreases, a warning is issued, a gas replenishment command is issued, or an operation lock is taken to prohibit device operation.

As shown in Figure 1, the conventional temperature-compensated pressure detection device
The gas pressure of the first fluid filled in the gas insulated electrical device 1 is detected by the first detection section 5, and the result is transmitted to the sensing rod 17 of the microswitch 15 via the lever 9. ing.

Further, the gas temperature is detected by the second detection section 8, and the result is transmitted to the lever 12, so that the deviation difference due to pressure and heat retention is corrected.

Therefore, if the second fluid whose temperature is detected by thermal expansion leaks from the second detection section, the bellows 6 of the second detection section 8 will contract and the lever 12 will move clockwise.
Since the microswitch 15 does not operate even if the gas density of the first fluid as an arc-extinguishing medium decreases, there is a drawback that no alarm is issued even if the gas density decreases.

This device includes a first detection unit that detects the pressure of the first fluid, and a second detection unit that detects the temperature of the first fluid by thermal expansion or contraction in which an expandable container is filled with a second fluid. a detecting section, and the rain detecting section cooperates to compensate for a change in the temperature of the first fluid to operate the actuating section, which prevents the container from shrinking when the second fluid leaks from the container. An object of the present invention is to provide a temperature-compensated pressure detection device that can issue an alarm when the second detection section becomes unable to operate normally by activating an alarm using the temperature compensation. .

The figures will be explained below.

In FIG. 2, 1 is a storage body in which the breaker 2 is housed and filled with SF6 gas, which is a first fluid having a predetermined pressure; 3 is a storage body that communicates with the storage body 1 and can expand and contract according to the gas pressure. The detection bellows 4 is a rod fixed to the bellows 3 □, and cooperates with the bellows 3 to constitute the first detection section 5 .

Reference numeral 6 denotes an expandable container consisting of a bellows filled with a second fluid for generating heat having a large thermal expansion and having one end disposed within the storage body 1, and 7 fixed to the other end of the bellows 6. The second detecting section 8 is a rod that cooperates with the bellows 6 to form a second detecting section 8 .

Reference numeral 9 denotes a lever that is in contact with the rod 4 and pivotally connected to the shaft 10; 11 is a spring that presses one end of the lever 9 clockwise against the rod 4; and 12 is a shaft that is in contact with the rod 7. A lever 13 is pivotally attached, 14 is a spring that presses the lever 12 against the rod I, and 15 and 16 are microswitches fixed to the lever 12, respectively, with movable contacts 15a and 16a. Contacts 15b and 16b that can be connected and separated and are normally open and normally closed.
and 15C916c.

A rod 17 has one end facing the rod 4 and abutting the other end of the lever 9, and the other end is connected to the movable contact 15a via a spring 18.

Note that the microswitch 15 and the rod 17 constitute an actuating section 19.

20 is a rod, one end facing the rod 4,
The lever 9 is disposed at a predetermined distance from the other end of the lever 9, and the other end is connected to the movable contact 16a.

Note that the microswitch 16 and the rod 20 constitute an alarm 21.

Next, the operation will be explained.

In FIG. 2, both contacts 15a and 15b of the actuator 190 are closed, indicating that the gas pressure in the container 1 is at a predetermined value, while both contacts 16a and 16b of the alarm 210 are also closed, indicating that the container 6 Assume that the second fluid inside the sensor does not leak, indicating that the second detection unit 8 is normal.

In this case, when the temperature of the first fluid in the storage body 1 rises, the rod 4 of the first detection section 5 moves to the upper blade, while the second detection section 5 moves to the upper blade.
As the temperature of the second fluid in the detection unit 8 increases, the rod 7 also moves upward.
2 also tries to rotate counterclockwise, so neither the actuating part 19 nor the alarm 21 is actuated and maintains its original state.

In this state, if the container 6 is damaged and the second fluid inside the container 6 leaks, the container 6 will contract and the lever 12 will be pressed by the spring 14 and rotated clockwise as shown in FIG. move.

For this reason, one end of the rod 20 comes into contact with the lever 9 and the movable contact 16a is moved, thereby opening the circuit between the two contacts 16a and 16b, and also opening the circuit between the two contacts 16a and 16c, which indicate an abnormality in the second detection section 8. Closed.

In this case, the spring 18 between the actuating portion 190 rod 17 and the movable contact 15a is compressed, so that no unreasonable force is applied to the movable contact 15a.

According to this invention, the second detection part is provided which operates the actuating part to compensate for the temperature change of the first fluid in cooperation with the first detection part which detects the pressure of the first fluid. a second detecting section for detecting the temperature of the first fluid from a container constituting the second detecting section;
By activating the alarm by utilizing the shrinkage of the container when the fluid leaks, it is possible to detect an abnormality in the second detection section, and also to detect an abnormality in the second detection section when the pressure of the first fluid fluctuates greatly. Since the actuating part is actuated by the detecting part of
Since abnormalities in the fluid pressure can be detected, reliability can be improved with a simple structure.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of a conventional temperature-compensated pressure detection device, FIG. 2 is an explanatory diagram showing an embodiment of this invention, and FIG.
The figure is an operation explanatory diagram showing the operation of the alarm device. In the figure, 5 is a first detection section, 6 is a container, 8 is a second detection section, 19 is an operating section, and 21 is an alarm. Note that the same reference numerals in each figure indicate gaps or corresponding parts, respectively.

Claims (1)

[Scope of utility model registration request] The pressure of the first fluid is detected by the first detection part, the first lever is moved, and the expandable container is filled with the second fluid, and the thermal expansion or contraction of the second fluid causes the second fluid to move. moving a second lever with a second detection unit that detects the temperature of the first fluid, and attaching an actuating unit to the second lever to perform a predetermined operation due to the movement of the first lever; The direction of the movement force of the first lever when the pressure of the first fluid increases and the direction of the movement force of the second lever when the second fluid expands are made to match. wherein when the second fluid leaks from the container and the container contracts, the second lever is accessible to the first lever, and the first lever actuates an alarm. A pressure detection device with temperature compensation, characterized in that it is attached to the lever of No. 2.