Gas charging equipment for preventing gas charging overpressure for GIS (Gas Insulated Switchgear)

Abstract

The utility model provides a GIS (Gas Insulated Switchgear) inflation device capable of preventing inflation overpressure, which belongs to the field of combined electric appliances, and comprises a three-way valve, the three-way valve is provided with a valve port I, a valve port II and a valve port III, the valve port I is communicated with an inflation pipeline, the valve port II is communicated with a GIS device interface, the valve port III is communicated with a pressure relief valve, and the pressure relief valve is communicated with a GIS device interface. When the three-way valve is in an open state, the first valve port, the second valve port and the third valve port are communicated at the same time. When the three-way valve is in a closed state, the first valve port and the second valve port are separated, and the first valve port and the third valve port are communicated. The utility model has the beneficial effects that in the inflating process of the GIS equipment, not only can the GIS equipment be accurately prevented from being excessively inflated and deflated, but also the GIS equipment has the characteristic of high cost performance.

Description

Technical Field

[0001] This utility model belongs to the field of combined electrical appliances, specifically relating to an inflation device for GIS to prevent over-inflation. Background Technology

[0002] GIS equipment, or Gas Insulated Switchgear, typically encloses high-voltage electrical components such as circuit breakers, disconnectors, grounding switches, transformers, surge arresters, and busbars within a grounded metal casing. This casing is filled with a pressurized insulating gas (mostly sulfur hexafluoride, SF6) as both insulation and arc-extinguishing medium. The excellent insulating properties of SF6 and similar gases ensure good insulation between live parts and between live parts and the casing. Furthermore, when an arc is generated during switch opening and closing, the strong negative charge and good thermal conductivity of SF6 and similar gases rapidly capture free electrons to form negative ions, reducing arc conductivity and quickly cooling the arc, achieving efficient arc extinguishing and ensuring reliable circuit interruption.

[0003] Currently, conventional GIS equipment inflation structures, when inflating GIS equipment, typically use oxygen pressure reducing valves installed on the metal casing of the GIS equipment or in the inflation pipeline to release excess pressure once the inflation pressure exceeds the rated pressure. During this process, gas enters the GIS equipment from the gas source through the inflation pipeline, and the gas release is controlled manually by operating the oxygen pressure reducing valve when the inflation pressure exceeds the rated pressure. Therefore, the entire inflation process relies entirely on the operator's experience and skill, resulting in inconvenience and difficulty in precisely controlling the pressure.

[0004] Furthermore, while some advanced inflatable structures incorporate automated pressure monitoring and control systems, using sensors to monitor gas pressure in real time and controllers to automatically control the opening and closing of inflation or deflation valves based on preset parameters for precise pressure control, the high cost of advanced sensors and accompanying automated control equipment significantly increases the initial procurement cost of the inflatable structure. Moreover, the subsequent maintenance costs are also high, including regular calibration, repairs, and replacement of damaged parts, increasing the total lifecycle cost of the GIS equipment. Utility Model Content

[0005] The purpose of this invention is to address the problem that existing inflatable structures for GIS equipment cannot simultaneously achieve cost advantages and high precision. This invention proposes and designs an inflatable device for GIS that prevents over-inflation and overcomes the aforementioned problems, achieving high cost-effectiveness while ensuring performance.

[0006] In order to achieve the above object, the utility model provides a technical scheme for: a kind of GIS is prevented to be filled with air overpressure's inflation equipment, it includes three-way valve, the three-way valve is provided with valve port one, valve port two and valve port three, the valve port one is communicated with inflation pipeline, the valve port two is communicated with GIS equipment interface, the valve port three is communicated with pressure release valve, when three-way valve is in open state, valve port one, valve port two and valve port three are simultaneously communicated;When three-way valve is in closed state, valve port one and valve port two are cut off, and valve port one and valve port three are communicated.This time, since the utility model is installed between the GIS equipment interface for being connected with the inflation valve of GIS equipment and inflation pipeline, it can automatically realize pressure control when filling and discharging by pressure release valve, i.e.

[0007] Further, the three-way valve includes a valve body one, a valve cavity is provided in the valve body one, the valve cavity simultaneously communicates the valve port one, the valve port two and the valve port three, a rotating rod is rotatably installed on the side wall of the valve cavity, a handle is installed on one end of the rotating rod extending out of the valve cavity, a valve core is installed on one end of the rotating rod extending into the valve cavity, a T-shaped channel is provided in the valve core, when the three-way valve is in the open state, the valve port one, the valve port two and the valve port three are simultaneously communicated through the T-shaped channel, when the three-way valve is in the closed state, the valve port one and the valve port two are cut off, and the valve port one and the valve port three are communicated through the T-shaped channel.

[0008] Further, the pressure release valve includes a valve body two, at least two pressure relief channels are penetrated between the two ends of the valve body two, the two ends of the pressure relief channel are provided as a pressure relief interface and an air inlet interface respectively, the air inlet interface can be communicated with the valve port three, a step surface one and a step surface two are sequentially provided between the inner walls of the pressure relief channel in the direction close to the air inlet interface, the step surface one and the step surface two are both towards the pressure relief interface, a spring is installed on the step surface two, the elastic coefficients of the springs in different pressure relief channels are different, a valve cover is installed on one end of the spring away from the air inlet interface, the valve cover can abut against the step surface one and realize the sealing of the entire pressure relief channel. In this way, since the pressure release valve of the utility model is provided with multiple pressure relief channels, it can flexibly select different pressure relief channels according to actual inflation requirements, and meet the inflation requirements of different GIS equipment.

[0009] Further, the pressure release valve is a spring type pressure release valve, and can control the opening and closing of the valve by spring elastic force.

[0010] Further, the pressure release valve is a diaphragm type pressure release valve, and can control the opening and closing of the valve by deformation of the diaphragm.

[0011] Further, the pressure release valve is a heavy hammer type pressure release valve, and controls the valve by the weight of the heavy hammer and the principle of lever.

[0012] Further, the pressure release interface of the pressure release valve is communicated with a gas recovery cabin, and the discharged gas is recovered through the gas recovery cabin, so as to avoid waste to the surrounding environment.

[0013] Further, the gas filling pipeline is communicated with a gas source at one end away from the three-way valve, and is provided with a gas filling control valve, and the opening and closing of the whole gas filling pipeline is controlled through the gas filling control valve.

[0014] From the above technical solution, the utility model has the following advantages: since the pressure release valve is installed between the GIS device interface for connecting with the gas filling valve of the GIS device and the gas filling pipeline, the pressure control during gas filling and gas discharging is automatically realized through the pressure release valve, that is, during the gas filling process of the GIS device, the pressure release valve, the gas filling pipeline and the GIS device are simultaneously communicated through the three-way valve in the open state, and when the gas filling of the GIS device is higher than the rated value, the pressure release valve is automatically opened by the gas pressure at the GIS device, until the internal pressure is reduced to the rated value, and then the pressure release valve is automatically closed, so that the excessive gas filling and excessive gas discharging are prevented, and the gas waste is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the utility model, the following will be briefly introduced the drawings needed to be used in the description, obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to these drawings without creative labor for the ordinary skilled in the art.

[0016] Figure 1 It is the structural schematic diagram of the embodiment of the utility model;

[0017] Figure 2 It is the structural schematic diagram of the three-way valve in the utility model;

[0018] Figure 3 It is the structural schematic diagram of the pressure release valve in the embodiment two of the utility model;

[0019] Figure 4 Figure 3 is a structural schematic diagram of the pressure relief valve in the third embodiment of the present application.

[0020] In the figure: 1, inflation pipeline; 2, three-way valve; 3, GIS device; 4, pressure relief valve; 5, pressure relief interface; 6, valve port three; 7, valve body one; 8, valve port two; 9, valve core; 10, T-shaped channel; 11, valve port one; 12, pressure relief channel; 13, valve body two; 14, valve cover; 15, spring; 16, air inlet; 17, gland two; 18, gland one. DETAILED DESCRIPTION

[0021] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the specific embodiments. Obviously, the embodiments described below are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present patent, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present patent.

[0022] Embodiment one

[0023] As shown in Figure 1 , Figure 2 , the first GIS inflation overpressure prevention inflation device of the present embodiment comprises a three-way valve 2, the three-way valve 2 comprises a valve body one 7, the inside of the valve body one 7 is provided with a valve cavity, and the side wall of the valve cavity is simultaneously penetrated by a valve port one 11, a valve port two 8 and a valve port three 6, a rotating rod is sealingly and rotatably installed on the side wall of the valve cavity, a handle is installed on one end of the rotating rod extending out of the valve cavity, a valve core 9 is installed on one end of the rotating rod extending into the valve cavity, the inside of the valve core 9 is provided with a T-shaped channel 10, and when an operator rotates the rotating rod through the handle, the three ports of the T-shaped channel 10 can be respectively arranged opposite to and communicated with the valve port one 11, the valve port two 8 and the valve port three 6, so that the valve port one 11, the valve port two 8 and the valve port three 6 are simultaneously communicated through the T-shaped channel 10, and at this time the three-way valve 2 is in an open state. At the same time, the three ports of the T-shaped channel 10 can also be arranged opposite to and communicated with the valve port one 11 and the valve port three 6 respectively, and the other one is arranged opposite to the side wall of the valve body one 7, so that the valve port one 11 and the valve port two 8 are cut off, the valve port one 11 and the valve port three 6 are communicated through the T-shaped channel 10, and at this time the three-way valve 2 is in a closed state.

[0024] In addition, the first embodiment is further provided with a gas charging pipeline 1 connected to the valve port 1 1, one end of the gas charging pipeline 1 is connected to a gas source, and the gas charging pipeline 1 is provided with a gas charging control valve for controlling the opening and closing of the whole gas charging pipeline 1. The GIS device interface is connected to the valve port 2 8, and the GIS device interface is connected to the gas charging valve of the GIS device to be charged to realize the corresponding gas charging function. The pressure relief valve 4 is connected to the valve port 3 6, and the pressure relief valve 4 can be a spring type pressure relief valve, a diaphragm type pressure relief valve, a heavy hammer type pressure relief valve, etc. commonly used in the market, and the opening and closing of the valve (i.e. the pressure relief interface) is controlled by the corresponding automatic control structure.

[0025] At the same time, as preferred, the first embodiment can also be provided with a gas recovery cabin at the pressure relief interface 5 of each pressure relief valve 4, and the discharged gas is recovered through the gas recovery cabin to avoid waste to the surrounding environment.

[0026] Therefore, when the first embodiment is used to charge the GIS device shell, since the first embodiment is provided with the pressure relief valve 4 between the GIS device interface for connecting the GIS device gas charging valve and the gas charging pipeline 1, the pressure control during charging and discharging can be automatically realized through the pressure relief valve 4, that is, during the gas charging of the GIS device, the pressure relief valve 4, the gas charging pipeline 1 and the GIS device can be simultaneously connected through the three-way valve 2 in the open state, and when the GIS device is charged to a value higher than the rated value, the pressure relief valve 4 is automatically opened by the gas pressure at the GIS device, and the pressure relief valve 4 is automatically closed after the internal pressure is reduced to the rated value, thereby preventing excessive charging and discharging, and further causing gas waste. Moreover, since the first embodiment directly connects the pressure relief valve 4, the gas charging valve of the GIS device and the gas charging pipeline 1 through the three-way valve 2, it does not need to modify the GIS device and use high-precision sensors and other elements, thereby having high cost performance.

[0027] Embodiment two

[0028] The second GIS gas charging device for preventing overcharging provided by the second embodiment is different from the first embodiment in that the pressure relief valve 4 in the second embodiment has a rated pressure value selection function, that is, the second embodiment can flexibly select different pressure relief channels 12 according to the actual charging requirements to meet the charging requirements of different GIS devices, thereby having universality.

[0029] Specifically, as Figure 3As shown, the pressure relief valve 4 in this embodiment includes a valve body 13. At least two pressure relief channels 12 extend through the two ends of the valve body 13. The two ends of each pressure relief channel 12 are respectively configured as a pressure relief port 5 and an air inlet port 16. The air inlet port 16 can communicate with a valve port 6. A stepped surface 1 and a stepped surface 2 are sequentially arranged on the inner wall of each pressure relief channel 12 along the direction close to the air inlet port 16. Both stepped surfaces 1 and 2 face the pressure relief port 5, and a spring 15 is installed on stepped surface 2. The spring force of the spring 15 in different pressure relief channels 12 is different. A valve cover 14 is installed on the end of the spring 15 away from the air inlet port 16. The valve cover 14 can abut against stepped surface 1, achieving a seal for the entire pressure relief channel 12. Thus, because the pressure relief valve 4 in this embodiment has multiple pressure relief channels 12 and springs 15 with different elastic coefficients are installed in each pressure relief channel 12, different pressure relief channels 12 can be flexibly selected according to actual inflation requirements to meet the inflation requirements of different GIS equipment. Furthermore, to facilitate selection by operators, numerical markings can be made on the outer surface of valve body 213.

[0030] In addition, as a preferred embodiment, this embodiment can also connect a gas recovery chamber to the pressure relief port 5 of the pressure relief valve 4, and recover the discharged gas through the gas recovery chamber to avoid wasting it on the surrounding environment.

[0031] Example 3

[0032] This third embodiment provides a third type of inflation device for GIS to prevent over-inflation. The difference between this and the second embodiment is that the pressure relief valve 4 in this third embodiment has an air inlet 16 and a pressure relief port 5 designed as separate adjustable structures, and only one air inlet 16 and one pressure relief port 5 are provided.

[0033] Specifically, such as Figure 4 As shown, the pressure relief valve 4 in this embodiment includes a valve body 13. The valve body 13 has a first mounting groove and a second mounting groove at its two ends. A first pressure cap 18 is rotatably and sealed in the first mounting groove, and a pressure relief port 5 passes through the two ends of the first pressure cap 18. A second pressure cap 17 is rotatably and sealed in the second mounting groove, and an air inlet port 16 passes through the two ends of the second pressure cap 17. The air inlet port 16 can communicate with the valve port 6.

[0034] At least two pressure relief channels 12 are arranged through the bottom of the mounting groove one and the bottom of the mounting groove two, and the two ends of the pressure relief channels 12 can be communicated with the corresponding air inlet interface 16 and the pressure relief interface 5 respectively when the pressure cover one 18 and the pressure cover two 17 are rotated. Meanwhile, the inner walls of the pressure relief channels 12 are sequentially provided with a step surface one and a step surface two in the direction close to the air inlet interface 16, the step surface one and the step surface two are both towards the pressure relief interface 5, and the step surface two is provided with the spring 15, the elastic force of the spring 15 in different pressure relief channels 12 is different; the end of the spring 15 away from the air inlet interface 16 is provided with the valve cover 14, the valve cover 14 can abut against the step surface one and realize the sealing of the whole pressure relief channel 12. In this way, since the pressure relief valve 4 of the third embodiment is provided with multiple pressure relief channels 12 and is provided with the springs 15 with different elastic coefficients in each pressure relief channel 12, different pressure relief channels 12 can be selected flexibly according to the actual inflation demand, and the inflation requirements of different GIS devices can be met. Moreover, in order to facilitate the selection of the operator, numerical value identification can be carried out on the outer surfaces of the pressure cover one 18 and the pressure cover two 17, and rotating handles can be arranged on the outer ends of the pressure cover one 18 and the pressure cover two 17.

[0035] The above description of disclosed embodiments enables those skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas filling device for preventing overpressure of GIS, comprising a three-way valve provided with a valve port one, a valve port two and a valve port three, the valve port one being communicated with a gas filling pipeline, the valve port two being communicated with a GIS device interface; characterized in that, The valve port three-way communication has a pressure relief valve, when the three-way valve is in the open state, the valve port one, the valve port two and the valve port three are communicated simultaneously; when the three-way valve is in the closed state, the valve port one and the valve port two are disconnected, and the valve port one and the valve port three are communicated.

2. The gas-filled equipment for preventing overpressure of GIS according to claim 1, characterized by, The three-way valve includes a valve body one, the inside of the valve body one is provided with a valve cavity, the valve cavity simultaneously communicates the valve port one, the valve port two and the valve port three; the side wall of the valve cavity is rotatably installed with a rotating rod, one end of the rotating rod extends out of the valve cavity and is installed with a handle, one end of the rotating rod extends into the valve cavity and is installed with a valve core, the inside of the valve core is provided with a T-shaped channel, when the three-way valve is in the open state, the valve port one, the valve port two and the valve port three are simultaneously communicated through the T-shaped channel; when the three-way valve is in the closed state, the valve port one and the valve port two are disconnected, and the valve port one and the valve port three are communicated through the T-shaped channel.

3. The gas filling apparatus for preventing overpressure of GIS according to claim 1, characterized by, The pressure relief valve includes a valve body two, at least two pressure relief channels pass through between the two ends of the valve body two, the two ends of the pressure relief channel are provided with a pressure relief interface and an air inlet interface respectively, the air inlet interface can be communicated with the valve port three; the inner wall of the pressure relief channel is sequentially provided with a step surface one and a step surface two along the direction close to the air inlet interface, the step surface one and the step surface two are both towards the pressure relief interface, and the step surface two is installed with a spring, the elastic coefficients of the springs in different pressure relief channels are different; one end of the spring away from the air inlet interface is installed with a valve cover, the valve cover can abut against the step surface one.

4. The gas filling apparatus for preventing overpressure of the GIS according to claim 1, characterized by, The pressure relief valve is a spring type pressure relief valve.

5. The gas-filled equipment for preventing overpressure of GIS according to claim 1, characterized by, The pressure relief valve is a diaphragm type pressure relief valve.

6. The gas-filled equipment for preventing overpressure of GIS according to claim 1, characterized by, The pressure relief valve is a heavy hammer type pressure relief valve.

7. The gas filling apparatus for preventing overpressure of a GIS according to any one of claims 3 to 6, characterized by, The pressure relief interface of the pressure relief valve is communicated with a gas recovery cabin.

8. The gas-filled equipment for preventing overpressure of GIS according to claim 1, characterized by, One end of the inflation pipeline away from the three-way valve is communicated with a gas source, and the inflation pipeline is assembled with an inflation control valve.

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