JPH0464573B2 - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of an insulating gas density detection device according to an embodiment of the present invention, FIG. 2 is a side sectional view of FIG. 1 with the interior omitted, and FIG. 3 is a sectional view of another embodiment. FIG. 4 is a diagram showing changes in pressure with respect to temperature, and FIG. 5 is a sectional view of a conventional example. In the figure, 1 is a detection container (gas insulated equipment storage container), 7 is a temperature compensation container (temperature sensing cylinder), 10 is a Bourdon tube inner chamber, 13 is a lever, 15 is a micro switch, 21 is a Bourdon tube storage container, 22 is the extraductal chamber of Bourdon, and 27 is the canal of Bourdon. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A Bourdon tube to which the pressure of either the detection target container or the temperature compensation container is transmitted, and a Bourdon tube storage container to which the pressure of the other of the two containers is transmitted. and a detection means for detecting displacement of the Bourdon tube by a predetermined amount or more. 2. The insulating gas density detection device according to claim 1, wherein the pressure of the detection target container is transmitted to the Bourdon tube storage container, and the pressure of the temperature compensation container is transmitted to the Bourdon tube. 3. The insulating gas density detection device according to claim 1, wherein the pressure of the detection target container is transmitted to the Bourdon tube, and the pressure of the temperature compensation container is transmitted to the Bourdon tube storage container. 4. The insulating gas density detection device according to claim 1, wherein the Bourdon tube storage container also serves as the temperature compensation container, and the pressure of the detection target container is transmitted to the Bourdon tube. 5. The Bourdon tube also serves as the temperature compensation container,
The insulating gas density detection device according to claim 1, wherein the pressure of the detection target container is transmitted to the Bourdon tube storage container. 6. The insulating gas density detection device according to claim 1, wherein the detection means is a micro switch that operates in response to the displacement. 7. The insulating gas density detection device according to claim 1, wherein the detection means is a non-contact detection means that operates in response to the displacement. * Theory [Industrial Application Field] This invention relates to an insulating gas density detection device for detecting leakage of an insulating gas sealed for insulation in a sealed container housing electrical equipment requiring insulation. [Prior art] Equipment that uses high-voltage electricity, such as power transmission and distribution equipment, is housed in a sealed container and filled with an insulating gas such as an inert gas to insulate and prevent electrical discharge. Some products are designed for insulation. This insulating gas is sealed at a predetermined density, that is, at a predetermined pressure, for the purpose of imparting a desired insulating ability. If a leak occurs in the container filled with this insulating gas and the insulating gas escapes, the insulation of the contained equipment will deteriorate, causing problems. Therefore, the pressure inside this container is detected, and if there is a drop in gas pressure,
Measures such as repair or replacement must be taken. Therefore, devices are provided that detect a drop in gas pressure and issue an alarm. However, in addition to changes in the climate, the amount of heat generated by the housed electrical equipment changes greatly depending on the amount of electricity passing through, etc., and the temperature of the insulating gas also changes greatly. In general, assuming that the state of the gas conforms to the following equation P·V=R·T, the volume V of the container is constant, so the pressure P of the gas changes in proportion to the absolute temperature T. As described above, the gas pressure changes depending on the temperature, so simply measuring the gas pressure cannot determine the density of the gas and cannot detect the presence or absence of a leak, which is useless. By measuring the pressure compensated for temperature, the density of the enclosed insulating gas can be accurately measured and the presence or absence of leakage can be detected. If the predetermined gas density is insufficient, it means that the insulation ability has decreased, so it is necessary to take measures. In the conventional insulating gas density detection device, as shown in FIG. A first bellows 3 is provided in the first chamber 5. The other side of the case 2 is sealed with a second container 9 that is connected via a connecting pipe 11 to a temperature sensing cylinder 7 installed in the gas insulated equipment storage container 1 so as to have the same temperature as the insulating gas to be detected. A second chamber 10 is provided, and a second chamber 1
A second bellows 8 is provided inside the bellows 8. 1st
The membrane plate of the bellows 3 and the membrane plate of the second bellows 8 are connected by a connecting rod 12, and the connecting rod 12 moves in the vertical direction in the figure due to the balance of forces between the first bellows 3 and the second bellows 8. A coil spring 14 is attached to the connecting rod 12 in order to adjust the balance of the forces mentioned above. One end of a lever 13 is connected to the connecting rod 12 with a pin. A point 16 is attached to the other end of the lever 13. The amount of protrusion of the point 16 can be adjusted with an adjustment screw 16a, and the adjustment setting position is fixed with a lock nut 17. A micro switch 15 is installed in case 2,
When the button 15a of the micro switch 15 is pressed at point 16, it is turned on. The micro switch 15 passes through the lead wire terminal 18 and the cable 19.
It is connected to an alarm device (not shown). Next, the operation will be explained. If the gas insulated equipment storage container 1 is normal with no leakage, as the temperature rises, the pressure in the first chamber 5 increases, and the first bellows 3
to push up the connecting rod 12. However, the temperature of the temperature sensing cylinder 7 has also increased, and the gas pressure within the temperature sensing cylinder 7 has also increased, pushing down the connecting rod 12 via the second bellows 8 of the second chamber 10. Due to the balance between the two forces, the connecting rod does not move, the lever 13 does not move, the micro switch 15 remains off, and no alarm is issued. Even when the temperature drops, the two forces remain balanced and the microswitch 15 remains off. If there is a leak in the gas insulated equipment container 1,
The pressure in the chamber 5 decreases, the balance of forces between the first bellows 3 and the second bellows 8 is lost, the connecting rod 12 is pushed down, the lever 13 rotates clockwise, and the point 16 is pressed against the button of the micro switch 15. 15a is pressed, the micro switch 15 is turned on and an alarm is issued. [Problems to be solved by the invention] As explained above, the conventional insulating gas density detection device has a complicated structure and requires two bellows, and a gasket is placed around each bellows to ensure that There are problems in that many parts need to be treated to make them airtight, require careful assembly work, are susceptible to gas leaks, and are low in reliability. The present invention was made to solve the above-mentioned problems, and an object thereof is to obtain an insulating gas density detection device that has a simple structure, does not require elaborate assembly work, and has high reliability. [Means for Solving the Problems] The insulating gas density detection device according to the present invention has a Bourdon tube to which the pressure of either the detection target container or the temperature compensation container is transmitted, and the pressure of the other container being transmitted. It consists of a bourdon tube storage container to which the information is transmitted, and a detection means for detecting displacement of the bourdon tube by a predetermined amount or more. [Function] In the insulating gas density detection device of the present invention, one of the detection target container or the temperature compensation container is communicated with the Bourdon tube, and the other is communicated with the Bourdon tube storage container, so that the Bourdon tube is free from fluctuations in the pressure difference inside and outside the tube. Therefore, even if there is a change in temperature and the gas pressure inside the container to be detected changes, the gas pressure inside the temperature compensation container will also change at the same time, and the pressure will not be balanced inside and outside the Bourdon tube. will be retained,
The Bourdon tube does not move. The Bourdon tube moves only when there is a leak in the container and the pressure is unbalanced, and this is detected by the detection means and an alarm is issued. [Example] Hereinafter, an example of the present invention will be described with reference to the drawings. Fig. 1 is a front cross-sectional view of the embodiment, and Fig. 2 is a cross-sectional view of the first embodiment.
FIG. 3 is a side sectional view with the interior thereof omitted, and FIG. 3 is a front sectional view of another embodiment. In FIG. 1, a Bourdon tube 27 is housed in a Bourdon tube container 21 that is assembled in a completely airtight manner. The Bourdon tube extrachamber 22 inside the Bourdon tube storage container communicates with the detection target container 1, which is a gas insulated equipment storage container filled with an insulating gas, through a connecting pipe 6. The Bourdon tube inner chamber 10 communicates with a temperature compensating container (temperature sensing cylinder) 7 installed in the detection target container 1 through a connecting pipe 11 . The tip of the Bourdon tube 27 is pin-jointed to one end of the lever 13,
A point 16 having an adjustment screw 16a and a lock nut 17 is attached to the other end of the lever 13. Button 15 opposite point 16
The micro switch 15 is installed so that a is facing. Lead wire 2 from micro switch 15
6. A cable 19 is installed, and the cable 19 is connected to an alarm means (not shown). Lead wire 2
In the hole through which 6 passes through the Bourdon tube storage container 21,
For example, it is filled with a sealing compound 25 of synthetic resin to make it completely airtight. As shown in FIG. 2, a lid 31 is attached to the Bourdon tube storage container 21 through a gasket 32 to make it completely airtight. Next, the operation will be explained. When a leak occurs in the gas insulated equipment storage container 1, which is the container to be detected, and the insulating gas escapes, the pressure inside the container 1 to be detected decreases.
The pressure in the extra-Bourdon canal chamber 22, which is communicated through the connecting pipe 6, also decreases. Therefore, the Bourdon tube 27 expands due to the difference in internal and external pressure, and the lever 13 connected to the tip of the Bourdon tube 27 is rotated counterclockwise. As a result, the point 16 provided at the other end of the lever 13 presses the button 15a of the micro switch 15, turning on the micro switch 15 and activating an alarm means (not shown) via the lead wire 26 and cable 19. Even if the detection target container 1 etc. is normal with no leakage, if there is a temperature change as described above, the pressure of the filled gas will change as shown in FIG. 4. However, in the embodiment shown in FIG. 1, the detection container 1 communicates with the extra-Bourdon canal chamber 22, and the temperature-compensating container 7 communicates with the inner Bourdon canal chamber 10. 22 changes, the gas pressure in the temperature compensating container 7, which is installed in the detection container 1 and undergoes the same temperature change, will also change in the same way, and the pressure in the communicating Bourdon tube internal chamber 10 will also change. make the same change. In this way, even if there is a temperature change, there will be the same pressure change inside and outside the Bourdon tube 27, and the shape of the Bourdon tube 27 will not change. Therefore, the micro switch 15 is not activated and no alarm is issued. The one-dot chain line in FIG. 4 indicates that even if the pressure of the sealed gas changes depending on the temperature, the operating pressure of the detection device also changes in the same way, so it does not operate unless there is a gas leak. Note that the adjustment screw 16a at point 16 is for adjusting the operating point, and the lock nut 17 is for adjusting the operating point.
is for fixing in the adjusted position. FIG. 3 shows another embodiment. In FIG. 3, the Bourdon tube housing container 21 is directly installed in the detection target container 1, and the Bourdon tube inner chamber 10 is communicated with the detection target container 1. In FIG. 3, the pressure inside the detection vessel 1 acts on the Bourdon tube inner chamber 10, and the gas pressure in the Bourdon tube outer chamber 22 acts as the gas pressure inside the temperature compensation vessel. The configuration is such that the warm cylinder 7 and the communication pipes 11 and 6 are omitted. Further, since the pressure inside the detection container 1 is communicated with the Bourdon tube inner chamber 10 and the Bourdon tube outer chamber 22 is a temperature compensation container, the operation is reversed from that of the embodiment shown in FIG. The operation is exactly the same. In addition, as shown in FIG. 1, a configuration in which the inside of the container 1 to be detected is communicated with the Bourdon tube inner chamber 10 and the temperature compensating container 7 is communicated with the Bourdon outer chamber 22 is also possible. In addition, in FIG. 3, it is also possible to have a configuration in which the Bourdon tube 27 is sealed, the Bourdon tube inner chamber 10 itself is used as a temperature compensating container, and the Bourdon tube storage container 21 is open to the inside of the detection target container 1. This arrangement has the advantage of further reducing the number of locations that require sealing. Further, as a means for detecting the displacement of the Bourdon tube 27, instead of the micro switch 15, a magnetic,
It is also possible to use a displacement detection sensor that uses electrical capacitance, light, etc. [Effects of the Invention] As described above, according to the present invention, a Bourdon tube is used, the displacement due to the pressure difference between the inside and outside of the Bourdon tube is used to compensate for the pressure change due to the temperature change, and only the case of gas leakage is detected. As a result, the structure is simple, the number of parts that require airtightness is reduced, and airtightness is relatively easy to construct. Also,
It is resistant to vibration because it uses a Bourdon tube instead of bellows. These features make it possible to obtain a highly reliable insulating gas density detection device.