Insulating gas leakage detection device for gas insulated switch

Abstract

The utility model discloses an insulating gas leakage detection device for a gas insulated switch, which belongs to the technical field of gas insulated switches and comprises a base box, a sampling mechanism is arranged at the bottom end in the base box, and a transmission mechanism is arranged on the periphery of the inner wall of the base box. The transmission mechanism comprises a sliding groove formed in the inner wall of the base box, a transmission chain belt is arranged on the inner side wall of the sliding groove in a tensioning sliding mode, and a tensioning chain wheel used for driving is arranged on the inner side wall of the transmission chain belt in a tensioning fit mode. The sampling mechanism and the driving mechanism are arranged at the bottom of the gas insulation switch, the driving chain belt circularly rotates to drive the sampling rod to rotate around the periphery of the gas insulation switch, the sampling holes can sample and analyze gas at all positions of the outer wall of the gas insulation switch, and leaked SF6 gas can be timely and effectively warned; the safety problem that the environment is polluted by toxic gas due to a monitoring blind area caused by single-point monitoring of a traditional monitoring device is avoided, and the use safety of the gas insulated switch is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gas insulation switch technical field, in particular to a kind of insulation gas leakage detection device for gas insulation switch. BACKGROUND

[0002] Gas insulation switch (GIS) is a kind of high-voltage electrical equipment, these devices or components are all enclosed in metal ground shell, inside fills certain pressure SF6 insulation gas.

[0003] SF6 gas obtains the widespread application in electric power system with its excellent insulation and arc extinguishing performance, density is about 5 times air density, but under the action of high-voltage arc or high temperature, SF6 gas can be partially decomposed, and its decomposition often contains toxic, even if trace, also can cause death. When indoor switch using SF6 gas as insulation and arc extinguishing medium occurs leakage in use, SF6 gas and its decomposition that leak out can accumulate to indoor low layer space, cause local oxygen deficiency and poison, the life safety of the staff entering indoor constitutes serious danger.

[0004] Existing gas insulation switch volume is big, installation structure is complex, SF6 gas leakage position has compartment, insulator, O type sealing ring, switch insulation rod, mutual inductor secondary line terminal, box plate connecting point, gas chamber mother tube, accessory sand eye and gas chamber expansion joint interface etc. many places, conventional detection device can only carry out single-point detection at the bottom of equipment, so that the gas leaked at different positions cannot be detected, further cannot effectively avoid the danger of SF6 decomposition toxic gas.

[0005] To solve the above problems, an insulation gas leakage detection device for gas insulation switch is proposed. UTILITY MODEL CONTENTS

[0006] The main purpose of the utility model is to provide an insulation gas leakage detection device for gas insulation switch, which solves the problems mentioned in the background art.

[0007] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0008] An insulation gas leakage detection device for gas insulation switch, comprising a base box, a sampling mechanism is arranged at the bottom end of the inside of the base box, and a transmission mechanism is arranged around the inner wall of the base box.

[0009] The transmission mechanism comprises a sliding groove formed on the inner wall of the base box, a transmission chain belt is tensioned and slid on the inner side wall of the sliding groove, and a tensioning sprocket for driving is tensioned and matched on the inner side wall of the transmission chain belt.

[0010] The sampling mechanism comprises a sliding shaft which is slidingly installed with the chute, the sliding shaft is internally provided with a ventilation cavity, one end of the ventilation cavity is sealingly connected with an expansion tube slot which is fixed on the outer wall of the sliding shaft, the other end of the ventilation cavity is sealingly inserted with an expansion air inlet pipe, the expansion tube slot is internally provided with a slot cavity, and a sampling rod is detachably installed on the outside of the expansion tube slot.

[0011] Further, the top of the tensioning sprocket is fixed with a mounting plate through a shaft support, the chute is divided into upper and lower parts, the upper part is located at the bottom of the mounting plate, and the sliding shaft is limited to slide with the upper and lower parts.

[0012] Further, one group of the bottom of the tensioning sprocket is matched with a driving motor, and the bottom of the driving motor is fixed to the inner bottom of the base box.

[0013] Further, the end of the expansion air inlet pipe away from the sliding shaft is sealingly connected with a rotary air inlet ring, the rotary air inlet ring is internally and rotatably sealingly connected with an air inlet disc, the rotary air inlet ring is in internal communication with the air inlet disc, and the air inlet disc is valvedly connected with a sampling pump at the bottom.

[0014] Further, the output end of the sampling pump is connected with a detection box, and the detection box is connected with a driving power supply.

[0015] Further, the bottom of the detection box is connected with an external exhaust pipe penetrating through the base box through an electromagnetic valve.

[0016] The beneficial technical effects of the utility model are as follows:

[0017] The utility model discloses a sampling mechanism and a driving mechanism are arranged at the bottom of the gas insulated switch, the driving chain is circularly rotated, the sampling rod is driven to rotate around the gas insulated switch, the sampling hole can sample and analyze the gas at each position of the outer wall of the gas insulated switch, the leaked SF6 gas can be early warned in time, the safety problem that the single-point monitoring of the traditional monitoring device appears monitoring blind area and causes toxic gas to pollute the environment is avoided, and the use safety of the gas insulated switch is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a front view structural schematic diagram according to a preferred embodiment of the utility model of a kind of insulation gas leakage detection device for gas insulated switch;

[0019] Figure 2 It is a bottom view structural schematic diagram according to a preferred embodiment of the utility model of a kind of insulation gas leakage detection device for gas insulated switch;

[0020] Figure 3 It is an internal structure schematic diagram according to a preferred embodiment of the utility model of a kind of insulation gas leakage detection device for gas insulated switch;

[0021] Figure 4 Figure 1 is a front view of a sampling mechanism according to a preferred embodiment of the insulating gas leakage detection device for a gas insulated switch.

[0022] The reference signs are explained as follows:

[0023] 1, mounting plate; 2, sampling mechanism; 201, sampling rod; 202, telescopic pipe slot; 203, sliding shaft; 204, telescopic gas conveying pipe; 205, air inlet disc; 206, rotating air inlet ring; 207, sampling pump; 3, base box; 4, detection box; 5, transmission mechanism; 501, sliding groove; 502, transmission chain belt; 503, tension sprocket; 504, drive motor; 6, external exhaust pipe. DETAILED DESCRIPTION

[0024] In order to make the technical personnel in the art more clear and explicit technical solution of the present application, the following embodiments and the present application are described in further detail with reference to the drawings, but the embodiments of the present application are not limited thereto.

[0025] As shown in Figures 1-4 The present application provides an insulating gas leakage detection device for a gas insulated switch, which comprises a base box 3, a sampling mechanism 2 is arranged at the bottom end inside the base box 3, and a transmission mechanism 5 is arranged around the inner wall of the base box 3; the transmission mechanism 5 comprises a sliding groove 501 formed on the inner wall of the base box 3, a transmission chain belt 502 is tightly and slidably arranged on the inner side wall of the sliding groove 501, and a tension sprocket 503 for driving is tightly matched on the inner side wall of the transmission chain belt 502; the sampling mechanism 2 comprises a sliding shaft 203 slidably installed with the sliding groove 501, the sliding shaft 203 has an air passage inside, one end of the air passage is sealingly connected with a telescopic pipe slot 202 fixed on the outer wall of the sliding shaft 203, the other end of the air passage is sealingly inserted with a telescopic gas conveying pipe 204, the inside of the telescopic pipe slot 202 is a slot cavity, and the outside of the telescopic pipe slot 202 is detachably installed with a sampling rod 201.

[0026] In the above structure, the mounting plate 1 is provided with a spiral plate for mounting the gas insulated switch shell, the telescopic pipe slot 202 can adjust the extension length of the sampling rod 201, which is conducive to adapting to the shape of the gas insulated switch shell of different sizes, a plurality of air inlet holes are distributed on the sampling rod 201, which can suck and sample the leaked SF6 gas at different heights, improve the timeliness, accuracy and efficiency of sampling, and avoid that the SF6 gas leaked at a certain place floats to the bottom layer of other places after leakage and is not sampled and analyzed by the traditional fixed detection position detection equipment.

[0027] The mounting plate 1 is fixed on the top of the tensioning sprocket 503 through an axle support, the sliding groove 501 is divided into upper and lower parts, the upper part is located at the bottom of the mounting plate 1, the sliding axle 203 is limited to slide with the upper and lower parts, and four groups of tensioning sprockets can effectively tension the transmission chain 502, so that the stable sliding of the sliding axle 203 in the sliding groove 501 is maintained.

[0028] The bottom of one group of tensioning sprockets 503 is matched with the driving motor 504, the bottom of the driving motor 504 is fixed in the bottom of the base box 3, the driving motor 504 is synchronously controlled with the sampling mechanism 2, when the leakage is detected, the control center stops the driving motor 504 from stopping at the current position, so that the suction of the leaked gas is maintained, and diffusion is avoided.

[0029] The telescopic gas conveying pipe 204 is sealingly connected with the rotating air inlet ring 206 away from the sliding axle 203, the rotating air inlet ring 206 is sealingly connected with the air inlet disc 205 rotatingly in the inside, the rotating air inlet ring 206 is in communication with the inside of the air inlet disc 205, the sampling pump 207 is connected to the bottom of the air inlet disc 205, and the rotating air inlet ring 206 can be beneficial to the sliding axle 203 when it rotates around, and the gas conveying is maintained.

[0030] The output end of the sampling pump 207 is connected with the detection box 4, the detection box 4 is connected with an external driving power supply, and the detection box 4 is integrated with an electric breakdown detection assembly for detecting the leaked SF6 gas, and the working principle is that whether the SF6 gas is contained in the air is judged according to the change of the voltage between the high-voltage electrodes placed in the detected air according to the insulation characteristics of the SF6 gas. Because of the relatively simple structure, low cost and relatively high detection precision.

[0031] The bottom of the detection box 4 is connected with the external exhaust pipe 6 penetrating through the base box 3 through an electromagnetic valve, and the detected gas and the gas during the leakage are all sent into the external exhaust pipe through the external exhaust pipe 6 and sent into the atmosphere for dilution.

[0032] The working principle of the device is that when the device is used, the external power supply and the external control device are connected, the shell of the gas insulated switch is fixedly connected with the mounting plate 1, the sampling rod 201 rotates around the mounting plate 1 and the outer wall of the base box 3, and the gas around the gas insulated switch is sampled.

[0033] The sampling pump 207 sucks the air inlet disc 205 into negative pressure, the rotating air inlet ring 206 is sealingly connected with the air inlet disc 205 in rotation and realizes internal communication, the negative pressure sucks air from the inner cavity of the telescopic slide shaft 203 through the telescopic air conveying pipe 204 connected with the rotating air inlet ring 206, the telescopic pipe groove 202 connected with the inner cavity sucks air from the hole in the outer wall of the sampling rod 201, and then the position where SF6 gas is easily leaked on the outer wall of the gas insulated switch is precisely sampled and analyzed, the gas enters the detection box 4, through the electric breakdown detection principle, according to the characteristics of SF6 gas insulation, whether the air contains SF6 gas is judged from the change of voltage between the high-voltage electrodes placed in the detected air, if SF6 gas leakage exists, the sampling rod 201 stops at this position, the sampling pump 207 continuously sucks the gas, and the leaked SF6 gas and the decomposed toxic gas are sucked away and discharged from the external discharge pipeline, so as to avoid remaining in the indoor environment.

[0034] When the above structure is adopted, the gas insulated switch can be effectively monitored and protected, and the harm caused by insulation gas leakage can be avoided.

[0035] The above is only a further embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and concept of the present application within the scope disclosed by the present application, and it all belongs to the protection scope of the present application.

Claims

1. A gas-insulating gas leakage detection device for gas-insulated switches, comprising a base box (3), characterized in that: The base box (3) is provided with a sampling mechanism (2) at the bottom inside, and a transmission mechanism (5) is provided around the inner wall of the base box (3); The transmission mechanism (5) includes a slide groove (501) formed on the inner wall of the base box (3), a transmission chain belt (502) is tensioned and slidably mounted on the inner side wall of the slide groove (501), and a tension sprocket (503) for driving is tensioned and fitted on the inner side wall of the transmission chain belt (502). The sampling mechanism (2) includes a sliding shaft (203) that is slidably installed with the sliding groove (501). The sliding shaft (203) has an internal ventilation channel. One end of the ventilation channel is sealed and connected to a telescopic tube groove (202) fixed on the outer wall of the sliding shaft (203). The other end of the ventilation channel is sealed and inserted with a telescopic air supply pipe (204). The inside of the telescopic tube groove (202) is a cavity, and a sampling rod (201) is detachably installed on the outside.

2. The gas insulation gas leakage detection device for a gas-insulated switch according to claim 1, characterized in that: The tension sprocket (503) is fixed to the top of the mounting plate (1) by a shaft support. The slide groove (501) is divided into upper and lower parts, with the upper part located at the bottom of the mounting plate (1). The slide shaft (203) slides between the upper and lower parts.

3. The gas insulation gas leakage detection device for a gas-insulated switch according to claim 2, characterized in that: One of the tension sprockets (503) is fitted with a drive motor (504) at its bottom, and the bottom of the drive motor (504) is fixed inside the base box (3).

4. The insulating gas leakage detection device for a gas-insulated switch according to claim 3, characterized in that: The end of the telescopic gas supply pipe (204) away from the sliding shaft (203) is sealed with a rotating air intake ring (206). The rotating air intake ring (206) is rotatably sealed with an air intake plate (205). The rotating air intake ring (206) communicates with the inside of the air intake plate (205). A sampling pump (207) is connected to the bottom valve of the air intake plate (205).

5. The insulating gas leakage detection device for a gas-insulated switch according to claim 4, characterized in that: The output end of the sampling pump (207) is connected to a detection box (4), and the detection box (4) is connected to an external driving power supply.

6. The insulating gas leakage detection device for a gas-insulated switch according to claim 5, characterized in that: The bottom of the testing box (4) is connected to an external exhaust pipe (6) that passes through the base box (3) via a solenoid valve.

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