Checking device of SF6 gas detection equipment for transformer substation

Abstract

The utility model discloses a verification device of SF6 gas detection equipment for a transformer station, which relates to the field of gas detection, and comprises a gas supply assembly used for providing mixed detection gas, and a fixing assembly comprising a closed pipe communicated with the output end of the gas supply assembly, a connecting port arranged at one end of the closed pipe, and a central pipe arranged in the closed pipe, the limiting plate is arranged at one end of the central pipe, and the vent hole is formed in the central pipe; the movable assembly comprises a movable sleeve arranged on the central pipe in a sleeving manner, a movable cavity and a pressure cavity which are formed in the movable sleeve, and a blocking block arranged at the top end of the movable sleeve; according to the calibration device of the SF6 gas detection equipment for the transformer substation, gas output during gas detection can be used for increasing the gas pressure in the closed pipe, the closed pipe is closed when the calibration device is not used, external air is prevented from entering the pipe, the measurement precision is prevented from being influenced, the connector is automatically opened and closed along with actions of exhaust detection and exhaust recovery during use, and the calibration device is convenient to use. Gas leakage can be prevented when mixed gas is pumped back.

Description

Technical Field

[0001] The utility model relates to a gas detection technology, in particular to a calibration device for SF6 gas detection equipment used in a transformer substation. Background Art

[0002] SF6 gas has excellent insulation and arc extinguishing properties, is not easy to decompose even at high temperatures, and exhibits good thermal stability. Due to its outstanding physical and chemical properties, it has been widely used in the field of power systems. Currently, the high-voltage room of a substation is equipped with an SF6 gas detection device to detect the concentration of SF6 gas and oxygen in the high-voltage room. An alarm will be triggered when the alarm concentration is reached. The main principle of this instrument is to use the SF6 gas and oxygen stored in the instrument itself, mix them to the specified concentration, and then spray them to each SF6 gas detector of the SF6 gas detection device (there are about a dozen distributed in the high-voltage room), simulating the phenomenon of SF6 gas leakage in the high-voltage room of the substation, thereby verifying whether the SF6 gas detection device can alarm normally, and further verifying whether there is a fault in the SF6 gas detectors distributed in the high-voltage room.

[0003] When the existing calibration device is in use, the pipe mouth connected to the SF6 gas detector is not closed, which allows outside air or debris to enter the pipeline, causing outside air to mix into the mixed gas during detection, affecting the detection accuracy. Similarly, when recovering the mixed gas, outside air is easily drawn back, causing air to mix into the mixed gas. Utility Model Content

[0004] The purpose of the utility model is to provide a calibration device for SF6 gas detection equipment used in a transformer substation to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a calibration device for SF6 gas detection equipment for a substation, comprising a gas supply component for providing mixed detection gas, and also comprising a fixed component, including a closed tube connected to the output end of the gas supply component, a connecting port arranged at one end of the closed tube, a central tube arranged in the closed tube, a limit plate arranged at one end of the central tube, and a vent hole opened on the central tube; a movable component, including a movable sleeve mounted on the central tube, a movable chamber and a pressure chamber arranged on the movable sleeve, and a blocking block arranged at the top of the movable sleeve.

[0006] Furthermore, the gas supply assembly includes a mixed gas chamber, an oxygen cylinder and an SF6 gas cylinder connected to the air inlet end of the mixed gas chamber, a communicating air pump arranged at the connection between the oxygen cylinder, SF6 gas cylinder and the mixed gas chamber, and a gas outlet arranged at the output end of the mixed gas chamber.

[0007] Furthermore, the output end of the closed tube is connected to the gas delivery port, and the output end of the closed tube is a closed connection port.

[0008] Furthermore, one end of the central tube close to the mixed gas chamber is open, and one end of the central tube close to the connecting port is closed by a limiting plate, and the diameter of the limiting plate is larger than the diameter of the central tube.

[0009] Furthermore, the inner wall of the movable sleeve is adapted to the limiting plate, and one end of the movable sleeve is fitted to the outer wall of the central tube.

[0010] Furthermore, the movable chamber is connected to the central tube through a vent hole, and a block is provided at the top of the pressure chamber, and the block is adapted to the connecting port.

[0011] Compared with the prior art, the utility model provides a calibration device for SF6 gas detection equipment for substations, which can use the gas output during gas detection to increase the air pressure in the closed tube and gradually increase the air pressure in the active cavity. When the air pressure rises, the active cavity moves along the axial direction, and the movable sleeve drives the block to open the connection port, so that the mixed SF6 gas can be sprayed to the probe to calibrate the SF6 gas detection equipment. After the detection is completed, the mixed gas chamber is pumped into the mixed gas chamber. As the air pressure in the closed tube decreases, the negative air pressure will pump out the gas in the active cavity. At this time, the movable sleeve drives the block to reset and reseal the connection port, so that the closed tube can be closed when not in use to prevent outside air from entering the tube and affecting the measurement accuracy. When in use, the connection port is automatically opened and closed with the exhaust detection and gas extraction, which can prevent leakage when the mixed gas is withdrawn. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0013] Figure 1 A schematic diagram of the overall structure provided for an embodiment of the present utility model;

[0014] Figure 2 A schematic diagram of a top view of the structure provided by an embodiment of the utility model;

[0015] Figure 3 for Figure 2 AA cross-sectional diagram;

[0016] Figure 4 A schematic diagram of the internal structure provided by an embodiment of the present utility model;

[0017] Figure 5A schematic cross-sectional diagram of the internal structure provided by an embodiment of the present utility model.

[0018] Description of reference numerals:

[0019] 100. Gas supply assembly; 101. Mixing gas chamber; 102. Oxygen cylinder; 103. SF6 gas cylinder; 104. Connecting air pump; 105. Gas outlet; 200. Fixed assembly; 201. Closing tube; 202. Connecting port; 203. Center tube; 204. Limiting plate; 205. Vent; 300. Movable assembly; 301. Movable sleeve; 302. Movable cavity; 303. Pressure cavity; 304. Block. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Example 1:

[0022] See also Figure 1-5 A calibration device for SF6 gas detection equipment for a substation includes a gas supply component 100 for providing mixed detection gas, and also includes a fixed component 200, including a closed tube 201 connected to the output end of the gas supply component 100, a connecting port 202 arranged at one end of the closed tube 201, a central tube 203 arranged in the closed tube 201, a limiting plate 204 arranged at one end of the central tube 203, and a vent 205 opened on the central tube 203; a movable component 300, including a movable sleeve 301 sleeved on the central tube 203, a movable chamber 302 and a pressure chamber 303 arranged on the movable sleeve 301, and a blocking block 304 arranged at the top of the movable sleeve 301.

[0023] Among them, the closed tube 201 is used to connect the gas supply component 100 with the detection probe or sensor of the gas detection equipment, so that the gas supply component 100 can spray the mixed gas directly onto the detection probe or sensor. The connection between the closed tube 201 and the gas supply component 100 is airtight, and the connection port 202 of the closed tube 201 is airtightly connected to the detection probe or sensor of the gas detection equipment. The closed tube 201 can maintain the overall airtight center tube 203 during detection, and the movable sleeve 301 can move along the axial direction of the center tube 203, thereby controlling the blockage 304 to close or open the connection port 202 of the closed tube 201.

[0024] One end of the center tube 203 close to the mixing gas chamber 101 is open, and the other end of the center tube 203 close to the connecting port 202 is closed by a limiting plate 204. The diameter of the limiting plate 204 is larger than the diameter of the center tube 203. The gas discharged from the mixing gas chamber 101 of the gas supply component 100 enters the center tube 203 synchronously when it is sent into the closed tube 201. One end of the center tube 203 is open and the other end is closed by the limiting plate 204.

[0025] The inner wall of the movable sleeve 301 is adapted to the limit plate 204, one end of the movable sleeve 301 is fitted with the outer wall of the center tube 203, and the inner wall of the movable sleeve 301 is slidingly connected to the limit plate 204. A seal is provided at one end of the movable sleeve 301 close to the air supply component 100, and the seal is fitted with and slidably connected to the outer wall of the center tube 203. The connection between the seal and the center tube 203 is airtight. When the movable sleeve 301 moves, the seal also moves along the center tube 203.

[0026] The active chamber 302 is connected to the central tube 203 through the vent hole 205. A block 304 is set at the top of the pressure chamber 303. The block 304 is adapted to the connecting port 202. The internal space of the movable sleeve 301 is divided into the active chamber 302 and the pressure chamber 303 by the limiting plate 204. The part of the movable sleeve 301 close to the air supply component 100 is the active chamber 302, and the part close to the connecting port 202 is the pressure chamber 303. A certain initial air pressure is provided inside the pressure chamber 303.

[0027] Operation process: When not in use, the air pressure in the closed tube 201 is low. At this time, the air pressure in the pressure chamber 303 is greater than that in the movable chamber 302. Under the action of air pressure, the movable sleeve 301 drives the blocking block 304 to press tightly against the connecting port 202. Due to the closing setting of the connecting port 202, the blocking block 304 can be made of deformable materials such as rubber, which can tightly seal the connecting port 202, thereby sealing the closed tube 201 and preventing outside air and debris from entering the closed tube 201; when calibrating the gas detection equipment, insert the connecting port 202 onto the detection probe or sensor of the gas detection equipment, and the gas supply component 100 starts to inject the mixed gas into the closed tube 201. As the gas in the closed tube 201 increases, the air pressure in the closed tube 201 begins to increase. At the same time, due to the ventilation of the movable chamber 302, The hole 205 is connected to the central tube 203, and the air pressure in the movable chamber 302 increases synchronously until the air pressure in the movable chamber 302 is greater than the air pressure in the pressure chamber 303, so that the movable sleeve 301 starts to move, the connecting port 202 is opened, and the mixed gas can be sprayed onto the detection probe or sensor through the connecting port 202 for verification; when the verification is completed, the gas supply component 100 starts to pump air and draws back the sprayed mixed gas. At this time, the air pressure in the closed tube 201 begins to decrease until the mixed gas in the closed tube 201 and from the connecting port 202 to the detection probe is completely evacuated. At this time, the air pressure in the pressure chamber 303 pushes the block 304 back to its original position, re-seals the connecting port 202, and continues to pump air to draw the closed tube 201 to a slightly negative pressure, so that the block 304 can block the connecting port 202 more tightly.

[0028] Example 2:

[0029] See also Figure 1-5 This embodiment provides a technical solution based on the first embodiment: the gas supply assembly 100 includes a mixed gas chamber 101, an oxygen cylinder 102 and an SF6 gas cylinder 103 connected to the gas inlet end of the mixed gas chamber 101, a connecting air pump 104 arranged at the connection between the oxygen cylinder 102, the SF6 gas cylinder 103 and the mixed gas chamber 101, and a gas delivery port 105 arranged at the output end of the mixed gas chamber 101. The oxygen cylinder 102 and the SF6 gas cylinder 103 are both provided with a pressure gauge, which can accurately input gas into the mixed gas chamber 101, so as to prepare the required mixed gas in the mixed gas chamber 101, and use the mixed gas to spray onto the detection probe or sensor of the gas detection equipment. Whether the gas detection equipment is normal is determined by whether the gas detection equipment alarms, and the exhaust and extraction of the mixed gas chamber 101 are controlled by the connecting air pump 104.

[0030] The output end of the closed tube 201 is connected to the gas delivery port 105. The output end of the closed tube 201 is a closed connection port 202. The closed tube 201 and the gas delivery port 105 can be connected by various means such as threaded connection, as long as the connection can be stable and airtight. When in use, the connection port 202 is directly inserted into the detection probe or sensor of the gas detection equipment. The end of the connection port 202 can be connected to the detection probe by means of snap fastening, interference fit, etc., as long as it can be kept airtight and fixed. When pumping gas, the connected air pump 104 only draws the ejected mixed gas into the mixed gas chamber 101, and does not draw it into the gas cylinder.

[0031] Working principle: When in use, according to the gas detection equipment that needs to be calibrated, first supply gas to the mixed gas chamber 101 through the oxygen cylinder 102 and the SF6 gas cylinder 103. After mixing in a certain ratio, the connection port 202 of this device is inserted into the detection probe or sensor of the gas detection equipment, and then the mixed gas chamber 101 starts to spray. When the movable component 300 opens the connection port 202, the mixed gas is sprayed on the detection probe or sensor. Whether the gas detection equipment is working normally is judged based on whether an alarm is issued, etc. When the detection of a detection probe or sensor is completed, the air pump 104 is connected to draw the mixed gas back to the mixed gas chamber 101 and temporarily store it in the mixed gas chamber 101. The device is inserted into the next detection probe or sensor of the same gas detection equipment, and the mixed gas in the mixed gas chamber 101 is used to continue calibration.

[0032] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A calibration device for SF6 gas detection equipment for a substation, comprising a gas supply assembly (100) for providing mixed detection gas, characterized in that: Also includes, A fixing assembly (200) comprises a closed tube (201) in communication with the output end of the air supply assembly (100), a connecting port (202) provided at one end of the closed tube (201), a central tube (203) provided in the closed tube (201), a limiting plate (204) provided at one end of the central tube (203), and a vent (205) provided on the central tube (203); The movable assembly (300) includes a movable sleeve (301) sleeved on the central tube (203), a movable chamber (302) and a pressure chamber (303) arranged on the movable sleeve (301), and a blocking block (304) arranged on the top of the movable sleeve (301).

2. A calibration device for SF6 gas detection equipment for a substation according to claim 1, characterized in that: The gas supply assembly (100) comprises a mixed gas chamber (101), an oxygen cylinder (102) and an SF6 gas cylinder (103) connected to the gas inlet end of the mixed gas chamber (101), a communicating air pump (104) arranged at the connection between the oxygen cylinder (102), the SF6 gas cylinder (103) and the mixed gas chamber (101), and a gas delivery port (105) arranged at the output end of the mixed gas chamber (101).

3. A calibration device for SF6 gas detection equipment for a substation according to claim 2, characterized in that: The output end of the closed tube (201) is connected to the gas delivery port (105), and the output end of the closed tube (201) is a closed connection port (202).

4. A calibration device for SF6 gas detection equipment for a substation according to claim 3, characterized in that: One end of the central tube (203) close to the mixed gas chamber (101) is open, and one end of the central tube (203) close to the connecting port (202) is closed by a limiting plate (204), wherein the diameter of the limiting plate (204) is larger than the diameter of the central tube (203).

5. A calibration device for SF6 gas detection equipment for a substation according to claim 1 or 4, characterized in that: The inner wall of the movable sleeve (301) is adapted to the limiting plate (204), and one end of the movable sleeve (301) is in contact with the outer wall of the central tube (203).

6. A calibration device for SF6 gas detection equipment for a substation according to claim 5, characterized in that: The movable chamber (302) is communicated with the central tube (203) through the vent hole (205). A blocking block (304) is provided at the top of the pressure chamber (303), and the blocking block (304) is adapted to the connecting port (202).

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