SF6 uninterrupted inflation device based on double bottle switching

Abstract

The utility model discloses a kind of SF6 uninterrupted inflation devices based on double-bottle switching, it is related to air inflation device technical field, including support shell, gasifier box body is fixedly installed in support shell middle part, two groups of steel bottle placing assembly are rotatably installed in gasifier box body two sides, the steel bottle placing assembly includes vertical rod and telescopic link, the tray for supporting steel bottle is provided at vertical rod bottom, air intake component for being communicated with steel bottle is provided in the upper side of gasifier box body, the air intake component includes first air inlet, second air inlet and switching valve, gasifier is provided in the inside of gasifier box body, the air outlet interface that the air outlet end of gasifier is communicated is provided in the lower side of the side of gasifier box body;The steel bottle placing assembly and air intake component of the utility model are set to solve the problem that SF6 is inflated in the process of being inflated into high-voltage switch, inflation work process has intermittence, leading to inflation work efficiency is not high, thereby wasting time.

Description

Technical Field

[0001] This invention relates to the field of inflation device technology, specifically to an SF6 uninterrupted inflation device based on dual-bottle switching. Background Technology

[0002] In high-voltage and ultra-high-voltage power systems, SF6 gas, due to its excellent insulation properties and powerful arc-extinguishing capabilities, has become the preferred insulation and arc-extinguishing medium in critical electrical equipment such as gas-insulated switchgear, circuit breakers, and instrument transformers. To ensure the reliable operation of these high-voltage switchgear, a specific and stable SF6 gas pressure and density must be maintained inside. Therefore, filling the equipment with SF6 gas during installation, commissioning, overhaul, and routine maintenance is an essential and frequently performed critical procedure.

[0003] Currently, the commonly used filling method in the industry is an intermittent filling scheme based on a single SF6 cylinder. The standard operating procedure is as follows: Place a single SF6 cylinder on a dedicated weighing trolley or support. Connect the cylinder outlet to the filling interface of the high-voltage switchgear through a calibrated hose or metal tube. The operator slowly opens the cylinder valve, utilizing the pressure difference between the inside of the cylinder and the equipment to fill the equipment with SF6 gas (actually stored in liquid form, vaporized before filling). During this process, the temperature of the cylinder and interface will drop sharply due to the heat absorbed by the liquid vaporization. The filling rate must be strictly controlled to prevent damage or seal failure of the equipment interface due to overcooling. Throughout the filling process, the operator must closely monitor the equipment's density relay or pressure gauge to observe the pressure rise. When the gas in a single cylinder is exhausted, the operator needs to close the valve of the empty cylinder; safely depressurize the pipeline; disconnect the empty cylinder; remove the empty cylinder and move a new full cylinder to the working position; reconnect the new full cylinder and repeat the above filling process until the gas pressure inside the equipment reaches the rated value. The problems with this traditional operating mode are: low work efficiency, serious waste of working time, and the forced interruption of the inflation process to replace the cylinder.

[0004] In summary, the existing single-cylinder series SF6 filling mode has become a significant problem restricting the improvement of power operation and maintenance efficiency, and there is an urgent need for a more efficient and continuous filling device to solve the above problems. Summary of the Invention

[0005] This invention provides an SF6 uninterrupted inflation device based on dual-bottle switching to solve the problem of intermittent SF6 inflation process and low working efficiency in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: This invention discloses an SF6 uninterrupted filling device based on dual-cylinder switching, comprising a supporting shell, a vaporizer housing fixedly installed in the middle of the supporting shell, two sets of cylinder placement assemblies rotatably installed on both sides of the vaporizer housing, each cylinder placement assembly including a vertical rod and a telescopic rod, a tray for supporting the cylinders provided at the bottom of the vertical rod, a limit plate provided at the top of the telescopic rod, and a locking element provided on one side of the telescopic rod, an air inlet assembly for communicating with the cylinders provided on the upper side of one side of the vaporizer housing, the air inlet assembly including a first air inlet, a second air inlet, and a switching valve, the first and second air inlets being respectively connected to two cylinders through pipelines, the switching valve being used to switch the connection between the first or second air inlet and the downstream pipeline, a vaporizer being provided inside the vaporizer housing, the air inlet of the vaporizer communicating with the air outlet of the switching valve, and an air outlet interface communicating with the air outlet end of the vaporizer being provided on the lower side of one side of the vaporizer housing.

[0007] As a preferred embodiment of the present invention, a pressure reducing valve is further provided inside the vaporizer housing, the outlet of the vaporizer is connected to the inlet of the pressure reducing valve, and the outlet of the pressure reducing valve is connected to the outlet interface.

[0008] As a preferred embodiment of the present invention, the switching valve is a high-pressure electric three-way valve.

[0009] As a preferred embodiment of the present invention, two sets of locking components corresponding to the cylinder placement assembly are provided on both sides of the vaporizer housing. The locking components include a foot pedal, a hook fixedly connected to the foot pedal, and a return spring. The hook is rotatably connected to the support housing. One end of the return spring is connected to the bottom of the foot pedal, and the other end is connected to the support housing. The bottom of the upright is provided with a locking shaft for engaging with the hook.

[0010] As a preferred embodiment of the present invention, the locking element on one side of the telescopic rod is a locking nut for locking its telescopic length.

[0011] As a preferred embodiment of the present invention, a rotating shaft is integrally provided at the middle position of the upright, and the rotating shaft is rotatably connected to the gasifier housing through a bearing seat.

[0012] As a preferred embodiment of the present invention, a cylinder support is provided on the upright near the pivot, and the side of the cylinder support facing the cylinder is arc-shaped for fitting against the outer wall of the cylinder.

[0013] As a preferred embodiment of the present invention, the first air inlet and the second air inlet are respectively connected to a first air inlet pipe and a second air inlet pipe for connecting to the gas cylinder, and the top of the vaporizer housing is provided with two clips for placing the first air inlet pipe and the second air inlet pipe.

[0014] As a preferred embodiment of the present invention, the top of the vaporizer housing is provided with two sealing plates corresponding to the buckles.

[0015] As a preferred embodiment of the present invention, a weighing sensor is provided inside the tray.

[0016] The beneficial effects of this invention are: 1. The present invention proposes an SF6 uninterrupted inflation device based on dual-cylinder switching. When the gas in the cylinder being filled is about to be exhausted, a new cylinder is placed in another cylinder position and then connected to the cylinder interface through another air inlet pipe. When the gas in the cylinder being used is completely exhausted, the switching valve is controlled to open the new pipeline and close the old pipeline. Then, the valve of the spare cylinder is opened to continue the inflation work. This solves the problem of low inflation efficiency and wasted time caused by the interval in the inflation process during SF6 inflation.

[0017] 2. The SF6 uninterrupted filling device based on dual-cylinder switching proposed in this invention can flip the cylinder after it is installed by setting a flipping mechanism. Since the SF6 gas inside the cylinder is stored in liquid form, the gas inside can be fully discharged when the cylinder is placed, reducing resource waste.

[0018] 3. The SF6 uninterrupted inflation device based on dual-bottle switching proposed in this invention can store the air inlet pipe when the device is not being inflated by a buckle set on the top of the box. At the same time, a sealing plate is also set on the top of the box to work with the buckle to seal the opening of the air inlet pipe, so as to prevent dust or impurities in the outside air from entering the air inlet pipe when it is stored for a long time, which would affect the subsequent inflation work. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of an SF6 uninterrupted inflation device based on dual-bottle switching according to the present invention. Figure 2 This is a schematic diagram of the flipping state of an SF6 uninterrupted inflation device based on dual-bottle switching according to the present invention. Figure 3 This is a partially enlarged view of the locking component of an SF6 uninterrupted inflation device based on dual-bottle switching according to the present invention. Figure 4 This is a partially enlarged view of the rotating shaft of an SF6 uninterrupted inflation device based on dual-bottle switching according to the present invention. Figure 5 This is a schematic diagram of the inflation pipeline structure of an SF6 uninterrupted inflation device based on dual-bottle switching according to the present invention. Figure 6 This is a partially enlarged view of the buckle and sealing plate of an SF6 uninterrupted inflation device based on dual-bottle switching according to the present invention. Figure 7 This is a schematic diagram of the foot pedal of an SF6 uninterrupted inflation device based on dual-bottle switching according to the present invention. Figure 8 This is a simplified schematic diagram of the internal structure of the vaporizer housing of an SF6 uninterrupted gasification device based on dual-bottle switching according to the present invention.

[0020] In the diagram: 1. Support housing; 2. Vaporizer housing; 21. Gas outlet; 22. First air inlet; 221. First air inlet pipe; 23. Second air inlet; 231. Second air inlet pipe; 24. Bearing seat; 25. Switching valve; 26. Vaporizer; 27. Pressure reducing valve; 28. Buckle; 29. ​​Sealing plate; 3. Upright pole; 31. Tray; 32. Locking shaft; 33. Rotating shaft; 34. Cylinder bracket; 4. Telescopic rod; 41. Limiting plate; 42. Locking nut; 5. Foot pedal; 51. Hook; 52. Return spring; 6. Cylinder. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0023] like Figures 1 to 8 As shown, an SF6 uninterrupted filling device based on dual-cylinder switching includes a support housing 1. A vaporizer box 2 is fixedly installed in the middle of the support housing 1. Two sets of cylinder placement assemblies are rotatably installed on both sides of the vaporizer box 2. Each cylinder placement assembly includes a vertical rod 3 and a telescopic rod 4. A tray 31 for supporting the cylinder is provided at the bottom of the vertical rod 3. A limit plate 41 is provided at the top of the telescopic rod 4. A locking element is provided on one side of the telescopic rod 4. An air inlet assembly for communicating with the cylinder is provided on the upper side of one side of the vaporizer box 2. The air intake assembly includes a first air intake 22, a second air intake 23, and a switching valve 25. The first air intake 22 and the second air intake 23 are respectively connected to two gas cylinders through pipelines. The switching valve 25 is used to switch the connection between the first air intake 22 or the second air intake 23 and the downstream pipeline. A vaporizer 26 is installed inside the vaporizer housing. The air intake of the vaporizer 26 is connected to the air outlet of the switching valve 25. An air outlet interface 21 connected to the air outlet end of the vaporizer 26 is provided on the lower side of the vaporizer housing 2.

[0024] Specifically, the supporting shell 1 and the vaporizer housing 2 constitute the main body of the device. In use, first adjust the height of the telescopic rod 4 to allow space for the gas cylinder. Then, place an SF6 gas cylinder on the tray 31. Next, adjust the height of the telescopic rod 4 again to fix the top of the cylinder. Use locking devices to fix the length of the telescopic rod 4. After the cylinder is fixed, connect the cylinder outlet to the first inlet 22 or the second inlet 23 via a pipeline. Simultaneously, switch valve 25 switches to open the inlet connected to the cylinder. Then, manually flip the upright rod 3. The upright rod 3 simultaneously flips the cylinder so that the cylinder opening is at the bottom. Because SF6 has a high gas density and is liquid inside the cylinder, inverting the cylinder allows the SF6 gas to flow out as liquid, accelerating the filling of SF6 gas. It also ensures that the liquid SF6 inside the cylinder is fully expelled, increasing the utilization rate of a single cylinder. Then, open the valve at the cylinder interface. Initially, liquid SF6 flows through switching valve 25 to vaporizer 26. After being processed by vaporizer 26, it flows as gas to outlet port 21. Outlet port 21 is connected to the equipment to be filled via a pipeline. During the filling process, another SF6 gas cylinder can be placed on the tray 31 of another cylinder placement assembly. After the cylinder is fixed, the cylinder port is connected to another air inlet via a pipeline to prepare for replacing the filling cylinder. When the SF6 in the previous cylinder is about to run out, the cylinder placement assembly holding the spare cylinder is flipped over. After the gas in the cylinder is completely exhausted, the connection pipeline with vaporizer 26 is switched through switching valve 25, and the spare cylinder is used for filling. This process takes very little time, so uninterrupted SF6 filling can be achieved. If the filling volume requirement is large, the spare cylinder can be used to replace the cylinder that has just been used, waiting for the next switch.

[0025] like Figure 8 As shown, a pressure reducing valve 27 is also installed inside the vaporizer housing 2. The outlet of the vaporizer 26 is connected to the inlet of the pressure reducing valve 27, and the outlet of the pressure reducing valve 27 is connected to the outlet interface 21.

[0026] Specifically, since the gas output after vaporization by vaporizer 26 is in a high-pressure state, if the high-pressure gas after vaporization by vaporizer 26 is directly introduced into the equipment to be filled, the outer shell and internal structure of the equipment to be filled will be destroyed by the high-pressure gas. Therefore, a pressure reducing valve is needed to reduce the pressure of the high-pressure gas. At the same time, as the gas in the cylinder is used continuously, the pressure inside the cylinder will gradually decrease, and the filling pressure will decrease accordingly, resulting in extremely slow and uncontrollable filling speed. The pressure reducing valve can automatically adjust to keep the outlet pressure stable at the preset value, ensuring that the filling process is smooth and controllable.

[0027] like Figure 8 As shown, the switching valve 25 is a high-pressure electric three-way valve. The switching valve 25 can be any electric three-way valve on the market that can withstand high pressure and low temperature.

[0028] like Figure 3 , Figure 5 and Figure 7 As shown, two sets of locking components corresponding to the cylinder placement assembly are provided on both sides of the vaporizer housing 2. The locking components include a foot pedal 5, a hook 51 fixedly connected to the foot pedal 5, and a return spring 52. The hook 51 is rotatably connected to the support housing 1. One end of the return spring 52 is connected to the bottom of the foot pedal 5, and the other end is connected to the support housing 1. The bottom of the upright 3 is provided with a locking shaft 32 for engaging with the hook 51.

[0029] Specifically, when the upright pole 3 is in a vertical position, its bottom locking shaft 32 is hooked by the hook 51, and the upright pole 3 cannot be flipped. At this time, the installation or disassembly of the gas cylinder is carried out. To ensure the stability of the device during this process, when the upright pole 3 needs to be flipped, the foot pedal 5 is stepped on, the return spring 52 is compressed, the foot pedal 5 rotates around the rotating shaft, causing the hook 51 at the other end to lift. After the hook 51 is lifted, the restriction on the locking shaft 32 is released, and the upright pole 3 can rotate normally. After releasing the foot, the foot pedal 5 is reset under the action of the return spring.

[0030] like Figure 5 As shown, the locking element on one side of the telescopic rod 4 is a locking nut 42 used to lock its telescopic length.

[0031] Specifically, the locking nut 42 is used to fix the height of the telescopic rod 4. When placing the gas cylinder, the telescopic rod 4 is controlled to move closer to the gas cylinder so that the limiting plate 41 at its top can hold the gas cylinder. Then, by rotating the locking nut 42, the telescopic rod 4 is locked to the upright rod 3, so that the gas cylinder is firmly and stably placed on the tray 31.

[0032] like Figure 4 As shown, a rotating shaft 33 is integrally provided in the middle position of the upright 3, and the rotating shaft 33 is rotatably connected to the gasifier box 2 through the bearing seat 24.

[0033] Specifically, the rotating shaft 33 is rotatably connected to the gasifier housing via the bearing seat 24, which can reduce rotational resistance, reduce wear, and increase service life.

[0034] like Figure 2 As shown, a cylinder bracket 34 is provided on the upright 3 near the pivot 33. The side of the cylinder bracket 34 facing the cylinder is arc-shaped to fit against the outer wall of the cylinder.

[0035] Specifically, after the cylinder is installed, it fits into the cylinder bracket 34, which provides some support for the cylinder when it is flipped over.

[0036] like Figure 5 and Figure 6As shown, the first air inlet 22 and the second air inlet 23 are respectively connected to the first air inlet pipe 221 and the second air inlet pipe 231 for connecting to the gas cylinder. The top of the vaporizer housing 2 is provided with two clips 28 for placing the first air inlet pipe 221 and the second air inlet pipe 231.

[0037] Specifically, the first air inlet pipe 221 and the second air inlet pipe 231 have sufficient length and flexibility to accommodate the inversion of the gas cylinder. The buckle 28 is interference-fitted with the first air inlet pipe 221 and the second air inlet pipe 231. When the first air inlet pipe 221 or the second air inlet pipe 231 is not in use, it is snapped into the slot of the buckle 28 for easy storage and retrieval of the air inlet pipe.

[0038] like Figure 5 and Figure 6 As shown, the top of the vaporizer housing 2 is provided with two sealing plates 29 corresponding to the buckles 28.

[0039] Specifically, there is a certain gap between each sealing plate 29 and its corresponding buckle 28. When the first air inlet pipe 221 or the second air inlet pipe 231 is placed, the opening of the first air inlet pipe 221 or the second air inlet pipe 231 is fitted with the sealing plate 29, and then the air inlet pipe is locked by the buckle 28. In this way, when the air inlet pipe is not in use, the opening of the air inlet pipe is in a blocked state, thereby preventing dust or impurities in the outside air from entering the air inlet pipe through the opening. Most of the air inlet pipes used to connect to the gas cylinder are equipped with nuts for connecting to the gas cylinder, so the gap between the sealing plate 29 and the buckle 28 can be the same as the width of the nut at the opening of the air inlet pipe. While the sealing plate 29 performs the function of sealing the opening, the buckle 28 prevents the air inlet pipe from falling off in the axial direction by blocking the nut of the air inlet pipe.

[0040] like Figure 1 and Figure 2 As shown, a weighing sensor is installed inside the tray 31, so that the amount of gas in the cylinder can be determined by the weight of the cylinder after one inflation operation is completed.

[0041] Working principle: After moving the device to the designated position, turn the locking nut 42 to unlock the telescopic rod 4 and the upright rod 3. Pull the telescopic rod 4 upward to make room for the gas cylinder. Place the gas cylinder filled with SF6 gas on the tray 31, ensuring that the gas cylinder is in contact with the gas cylinder holder 34 to ensure initial stability. Move the telescopic rod 4 downward until the limiting plate 41 at the top of the cylinder locks the top of the cylinder. Then turn the locking nut 42 to fix the telescopic rod 4 and the upright rod 3. After fixing the gas cylinder, connect the first inlet pipe 221 or the second inlet pipe 231 to the gas outlet of the gas cylinder. Simultaneously, the pipeline is switched to the state of connection with the gas cylinder via the switching valve 25. After the air inlet pipe is connected to the gas cylinder, step on the foot pedal 5. The other end of the foot pedal 5 drives the hook 51 to lift, causing the hook 51 to disengage from the locking shaft 32. After disengagement, manually rotate the upright rod 3 and the gas cylinder to make them rotate. After rotating to the designated state, open the valve at the gas cylinder opening to start filling. If the filling demand is relatively large, a new gas cylinder can be placed in another gas cylinder position during the filling process. Then, connect the spare gas cylinder to another air inlet pipe for standby. When the gas in the gas cylinder in use is about to be consumed... When the gas in the working cylinder is exhausted, rotate the spare cylinder to the designated position. After the gas in the working cylinder is depleted, control the switching valve 25 to close the connection line of the working cylinder and open the connection line of the spare cylinder. Then open the valve of the spare cylinder to continue the filling process. Since the cylinder will cool down due to the vaporization of the liquid gas inside during the filling process, you can wait until the cylinder temperature recovers a bit before disassembling and resetting. When resetting, first straighten the upright 3 and the cylinder. After straightening, the locking shaft 32 at the bottom of the upright 3 will be locked again by the hook 51. Then turn the locking nut 42 to make the telescopic rod 4 and the upright 3... Unlock and move the telescopic rod 4 upward to disengage the limiting plate 41 from the gas cylinder. Then remove the gas cylinder from the tray 31. If inflation is required, repeat the above installation steps. After inflation is completed, remove all gas cylinders, reset the device, and clip the openings of the first air inlet pipe 221 and the second air inlet pipe 231 into the slots of the buckle 28 to store the air inlet pipes. At the same time, the opening of the air inlet pipe is fitted with the sealing plate 29 to seal the opening of the air inlet pipe and prevent dust or impurities in the outside air from entering the air inlet pipe when it is left for a long time.

[0042] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An SF6 uninterrupted inflation device based on dual-bottle switching, characterized in that, The device includes a support housing (1), a vaporizer housing (2) fixedly installed in the middle of the support housing (1), and two sets of cylinder placement assemblies rotatably installed on both sides of the vaporizer housing (2). The cylinder placement assembly includes a vertical rod (3) and a telescopic rod (4). The bottom of the vertical rod (3) is provided with a tray (31) for supporting the cylinder. The top of the telescopic rod (4) is provided with a limit plate (41). A locking element is provided on one side of the telescopic rod (4). An air inlet assembly for communicating with the cylinder is provided on the upper side of one side of the vaporizer housing (2). The air inlet assembly includes a first air inlet. The gasifier housing (2) includes a first air inlet (22), a second air inlet (23), and a switching valve (25). The first air inlet (22) and the second air inlet (23) are connected to two gas cylinders via pipelines. The switching valve (25) is used to switch the connection between the first air inlet (22) or the second air inlet (23) and the downstream pipeline. The gasifier housing is equipped with a gasifier (26). The air inlet of the gasifier (26) is connected to the air outlet of the switching valve (25). The lower side of the gasifier housing (2) is provided with an air outlet (21) that is connected to the air outlet of the gasifier (26).

2. The SF6 uninterrupted inflation device based on dual-bottle switching according to claim 1, characterized in that, The vaporizer housing (2) is also equipped with a pressure reducing valve (27). The outlet of the vaporizer (26) is connected to the inlet of the pressure reducing valve (27), and the outlet of the pressure reducing valve (27) is connected to the outlet interface (21).

3. The SF6 uninterrupted inflation device based on dual-bottle switching according to claim 1, characterized in that, The switching valve (25) is a high-pressure electric three-way valve.

4. The SF6 uninterrupted inflation device based on dual-bottle switching according to claim 1, characterized in that, The vaporizer housing (2) is provided with two sets of locking components corresponding to the cylinder placement assembly on both sides. The locking components include a foot pedal (5), a hook (51) fixedly connected to the foot pedal (5), and a return spring (52). The hook (51) is rotatably connected to the support housing (1). One end of the return spring (52) is connected to the bottom of the foot pedal (5), and the other end is connected to the support housing (1). The bottom of the upright (3) is provided with a locking shaft (32) for engaging with the hook (51).

5. The SF6 uninterrupted inflation device based on dual-bottle switching according to claim 1, characterized in that, The locking element on one side of the telescopic rod (4) is a locking nut (42) used to lock its telescopic length.

6. The SF6 uninterrupted inflation device based on dual-bottle switching according to claim 4, characterized in that, A rotating shaft (33) is integrally provided at the middle position of the upright (3), and the rotating shaft (33) is rotatably connected to the gasifier box (2) through a bearing seat (24).

7. The SF6 uninterrupted inflation device based on dual-bottle switching according to claim 6, characterized in that, A cylinder bracket (34) is provided on the upright (3) near the pivot (33). The side of the cylinder bracket (34) facing the cylinder is arc-shaped and is used to fit against the outer wall of the cylinder.

8. The SF6 uninterrupted inflation device based on dual-bottle switching according to claim 1, characterized in that, The first air inlet (22) and the second air inlet (23) are respectively connected to the first air inlet pipe (221) and the second air inlet pipe (231) for connecting to the gas cylinder. The top of the vaporizer box (2) is provided with two buckles (28) for placing the first air inlet pipe (221) and the second air inlet pipe (231).

9. The SF6 uninterrupted inflation device based on dual-bottle switching according to claim 8, characterized in that, The top of the vaporizer housing (2) is provided with two sealing plates (29) corresponding to the buckles (28).

10. The SF6 uninterrupted inflation device based on dual-bottle switching according to claim 1, characterized in that, The tray (31) is equipped with a weighing sensor.

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