Foreign matter adsorption and anti-explosion combined device for gas insulation equipment

Abstract

The utility model discloses a foreign matter adsorption and explosion prevention combined device for gas insulation equipment, and belongs to the related technical field of the gas insulation equipment. Comprising a mounting cover plate, a through hole is reserved in the middle of the mounting cover plate, and an explosion-proof device is arranged on the mounting cover plate above a pressure relief hole; an annular porous outer net and an annular porous inner net are arranged between the upper cover plate and the lower cover plate along the radial direction of the adsorbent box assembly from outside to inside, and the outer net, the inner net, the upper cover plate and the lower cover plate are assembled to form an annular space for placing a drying agent; the whole adsorbent box assembly is fixedly installed on the lower portion of the installation cover plate through fastening screws. The utility model provides a foreign matter adsorption and anti-explosion combined device for gas insulation equipment, and solves the problems that a drying agent and a rupture disk in the traditional gas insulation equipment are separated, so that the dryness of insulation gas at the weakest position cannot be ensured, a plurality of branches need to be arranged on an equipment shell, and the equipment shell is inconvenient to use. And the manufacturing difficulty and cost of the equipment shell are increased.

Description

Technical Field

[0001] This utility model relates to the technical field of gas insulation equipment, and more specifically, to a foreign matter adsorption and explosion-proof combination device for gas insulation equipment. Background Technology

[0002] Gas-insulated switchgear (GIS) refers to metal-enclosed switchgear that uses gas, rather than air at atmospheric pressure, as the insulating medium, either entirely or partially. Typically, GIS is filled with SF6 insulating gas, which serves as both insulation and arc-quenching medium, and is widely used in high-voltage, ultra-high-voltage, and above applications.

[0003] During operation, gas-insulated switchgear (GES) will generate electric arcs in the breaking compartments. Some of the insulating gas is decomposed by the arc and cannot recombine, remaining suspended in the GCB arc-extinguishing chamber or DS disconnector housing. These decomposition products, when exposed to moisture, experience a decrease in insulation performance and affect the purity of the insulating gas. Adsorbents need to be installed in these compartments to absorb and purify the insulating gas. Simultaneously, atmospheric moisture may intrude into GES and GILs during operation. When this moisture condenses on the surface of the insulating components, the insulation performance will significantly decrease. Adsorbents are also needed to absorb the moisture in the insulating gas and keep it dry.

[0004] Gas-insulated switchgear and gas-insulated transmission lines have numerous components, gas chambers, and internal insulation parts, making them susceptible to internal grounding faults due to various reasons. The internal fault arc can last for a relatively long time, causing the arc energy to heat and pressurize the insulating gas within the fault chamber, potentially leading to the explosion of weak points. To prevent equipment damage, rupture discs are often installed at locations where faults are more likely to occur. If a grounding fault causes a sudden increase in gas pressure, exceeding a certain value, the rupture disc will detonate to release the pressure and protect the equipment casing.

[0005] However, there are still some problems with the placement of desiccant and rupture disc in gas-insulated switchgear and gas-insulated transmission lines. Due to the large number of components, gas chambers, and internal insulation parts, the desiccant and rupture disc are located separately, which makes it impossible to guarantee the drying of the insulating gas at the weakest point. Multiple branches need to be opened on the equipment casing, which increases the difficulty and cost of manufacturing the equipment casing. Utility Model Content

[0006] This invention addresses the problem mentioned above, where the desiccant and rupture disc in current gas-insulated switchgear and gas-insulated transmission lines are located separately, resulting in insufficient drying of the insulating gas at the weakest point and requiring multiple branches to be opened on the equipment casing, increasing the manufacturing difficulty and cost of the equipment casing. Therefore, this invention provides a foreign matter adsorption and explosion-proof combination device for gas-insulated equipment.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0008] A foreign matter adsorption and explosion-proof combination device for gas-insulated equipment includes a mounting cover plate with a through hole in the middle and an assembly hole for mounting the cover plate to a pre-reserved position on the gas-insulated equipment. An explosion-proof device is provided on the mounting cover plate above the pressure relief hole, and an adsorbent box assembly is provided on the mounting cover plate below the pressure relief hole. The adsorbent box assembly includes an outer mesh, an inner mesh, an upper cover plate, and a lower cover plate. The upper and lower cover plates are two annular plates with a through hole in the middle corresponding to the position of the central hole on the mounting cover plate. An annular and porous outer mesh and inner mesh are arranged radially from the outside to the inside of the adsorbent box assembly between the upper and lower cover plates. The outer mesh, inner mesh, upper cover plate, and lower cover plate are assembled to form an annular space for placing desiccant. The entire adsorbent box assembly is fixedly installed to the lower part of the mounting cover plate using fastening screws.

[0009] Preferably, the explosion-proof device includes a clamping frame, a rupture disc, and a sealing ring. The clamping frame is fitted and installed on the upper part of the mounting cover plate. The clamping frame has a through hole in the middle that corresponds to the position of the middle hole in the mounting cover plate. A rupture disc is installed inside the through hole to isolate the upper and lower sides of the through hole. The clamping frame is fixedly installed on the upper part of the mounting cover plate by clamping frame fastening bolts.

[0010] Preferably, the mounting cover plate at the bottom of the clamping frame is provided with an annular sealing groove, and a sealing ring is installed in the annular sealing groove; the annular sealing groove and the sealing ring are provided with two channels.

[0011] Preferably, a flow guide is also provided above the explosion-proof device as a whole, which is used to guide the gas and impurities released during operation to the radial direction of the flow guide.

[0012] Preferably, the flow guide is fixed to the upper part of the mounting cover by flow guide fastening bolts.

[0013] Preferably, the diameter of the through hole in the middle of the upper cover plate and the lower cover plate, as well as the diameter of the hole in the middle of the mounting cover plate, is not less than the diameter of the through hole of the clamping frame.

[0014] Preferably, the upper and lower cover plates have pre-drilled annular mounting grooves for assembling the outer and inner meshes on their opposite surfaces, with the upper and lower ends of the outer and inner meshes penetrating into the upper and lower cover plates through the annular mounting grooves.

[0015] Preferably, a fastening pin is provided between the upper cover plate and the lower cover plate. One end of the fastening pin is engaged at the bottom of the lower cover plate, and the other end of the fastening pin is threaded to the upper cover plate through an external thread. A countersunk plate is provided inside the fastening pin, and the fastening screw passes through the fastening pin and is threaded to the lower part of the mounting cover plate.

[0016] Compared with the prior art, the beneficial effects of this utility model's technical solution are:

[0017] This utility model provides a foreign matter adsorption and explosion-proof combination device for gas-insulated equipment, solving the problem that in gas-insulated combined electrical appliances and gas-insulated transmission lines, the desiccant and rupture disc are located separately, leading to insufficient drying of the insulating gas at the weakest point. This necessitates the creation of multiple branches on the equipment casing, increasing the manufacturing difficulty and cost of the equipment casing. Specifically:

[0018] 1) Install an adsorbent box assembly at the rupture disc mounting cover position, place the desiccant inside the adsorbent box assembly, and place the desiccant in the weak position inside the gas insulation equipment to dry and purify the insulating gas inside the gas insulation equipment. By designing the rupture disc and desiccant positions in a targeted manner, it is possible to reduce the need to open a single explosion-proof or desiccant installation branch on the equipment shell, thereby reducing the difficulty and cost of manufacturing the equipment shell.

[0019] 2) The adsorbent box assembly includes an inner mesh, an outer mesh, an upper cover plate, and a lower cover plate. The porous inner and outer meshes allow the insulating gas to fully contact the desiccant, ensuring that the desiccant performs better in adsorption. At the same time, the entire adsorbent box assembly is easy to disassemble, making it convenient for maintenance and desiccant replacement.

[0020] 3) The rupture disc is equipped with a semi-enclosed flow guide with a stamped structure. When the equipment grounding fault causes the rupture disc to break, it can guide the flow of gas inside the equipment and prevent possible foreign objects inside the equipment from being sprayed into the surrounding environment. In addition, when the equipment is running normally, the flow guide can also play a role in preventing rainwater. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 It is a structural diagram of the utility model;

[0023] Figure 2 For the utility model Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0024] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the adsorbent box assembly of this utility model.

[0025] The markings in the diagram are as follows: 1-1, Mounting cover; 1-2, shroud; 1-3, Clamping frame; 1-4, Rupture disc; 1-5, Sealing ring; 1-6, Clamping frame fastening bolts; 1-7, shroud fastening bolts; 1-8, Adsorbent box assembly; 1-9, Fastening screws; 2-1, Outer mesh; 2-2, Inner mesh; 2-3, Upper cover; 2-4, Lower cover; 2-5, Fastening pins. Detailed Implementation

[0026] To better understand the purpose, structure, and function of this utility model, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific preferred embodiments.

[0027] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in the embodiments are only for illustrating the technical solution and do not limit the scope of protection of this utility model. It is understandable that some well-known structures and their descriptions may be omitted in the accompanying drawings for those skilled in the art.

[0028] Unless otherwise expressly specified and limited, the terms "installation," "setting," "connection," and "fixation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] Example 1:

[0030] The explosion-proof device for existing gas-insulated equipment includes a mounting cover plate 1-1, which has a pressure relief hole in the middle and an assembly hole for installing the mounting cover plate 1-1 into the reserved position of the gas-insulated equipment. The mounting cover plate 1-1 above the pressure relief hole is equipped with an explosion-proof device.

[0031] Please see Figure 1-3This utility model provides a technical solution: a foreign matter adsorption and explosion-proof combination device for gas insulation equipment. Based on the above-mentioned prior art, the mounting cover plate 1-1 at the lower part of the pressure relief hole is provided with an adsorbent box assembly 1-8. The adsorbent box assembly 1-8 includes an outer mesh 2-1, an inner mesh 2-2, an upper cover plate 2-3, and a lower cover plate 2-4. The upper cover plate 2-3 and the lower cover plate 2-4 are two annular plates, and a pre-reserved space is provided between the upper cover plate 2-3 and the lower cover plate 2-4. There is a through hole in the cover plate corresponding to the position of the middle hole in the mounting cover plate 1-1; between the upper cover plate 2-3 and the lower cover plate 2-4, an annular and porous outer mesh 2-1 and inner mesh 2-2 are arranged radially from the outside to the inside along the adsorbent box assembly 1-8. The outer mesh 2-1, inner mesh 2-2, upper cover plate 2-3 and lower cover plate 2-4 are assembled to form an annular space for placing desiccant; the entire adsorbent box assembly 1-8 is fixedly installed to the lower part of the mounting cover plate 1-1 by fastening screws 1-9.

[0032] The adsorbent box assembly 1-8 is installed inside the gas insulation equipment. The adsorbent box assembly 1-8 has a through hole in the middle. The design of this through hole and the through hole in the middle of the mounting cover 1-1 does not affect the normal operation of the rupture disc 1-4. The adsorbent is placed inside the adsorbent box assembly 1-8, integrating the drying and explosion-proof structure of the gas insulation equipment. This is equivalent to drying the insulating gas in the most vulnerable part of the entire gas insulation equipment. The design of the drying position is more reasonable. Compared with the separate setting of desiccant and explosion-proof device, it can reduce the need to open a single explosion position or desiccant installation branch on the equipment shell, and reduce the manufacturing difficulty and cost of the equipment shell.

[0033] like Figure 2 As shown, the explosion-proof device includes a clamping frame 1-3, a rupture disc 1-4, and a sealing ring 1-5. The clamping frame 1-3 is fitted onto the upper part of the mounting cover plate 1-1. The clamping frame 1-3 has a through hole in the middle that corresponds to the position of the middle hole in the mounting cover plate 1-1. The rupture disc 1-4, which isolates the upper and lower sides of the through hole, is snapped into the through hole of the clamping frame 1-3. The clamping frame 1-3 is fixedly installed on the upper part of the mounting cover plate 1-1 by clamping frame fastening bolts 1-6.

[0034] The through hole in the middle of the clamping frame 1-3 is used for pressure relief. When the rupture disc 1-4 is installed, the rupture disc 1-4 should be installed in the middle of the clamping frame 1-3 and fixed by the compression mechanism. When the explosion actually occurs, the explosion-proof device composed of the clamping frame 1-3 and the rupture disc 1-4 must ensure that the pressure relief gas and some impurities are relieved through this position.

[0035] The mounting cover plate 1-1 at the bottom of the clamping frame 1-3 is provided with an annular sealing groove, and a sealing ring 1-5 is installed in the annular sealing groove; the annular sealing groove and the sealing ring 1-5 are provided with double channels.

[0036] A sealing ring 1-5 is installed in the middle of the annular sealing groove. Its function is to seal and prevent high-pressure gas and some impurities from leaking through the rupture disc 1-4.

[0037] The diameter of the through hole in the middle of the upper cover plate 2-3 and the lower cover plate 2-4, as well as the diameter of the middle hole in the mounting cover plate 1-1, shall not be less than the diameter of the through hole in the clamping frame 1-3, and shall not affect the normal operation of the rupture disc 1-4.

[0038] The upper cover plate 2-3 and the lower cover plate 2-4 have pre-reserved annular mounting grooves for assembling the outer mesh 2-1 and the inner mesh 2-2. The upper and lower ends of the outer mesh 2-1 and the inner mesh 2-2 are inserted into the upper cover plate 2-3 and the lower cover plate 2-4 through the annular mounting grooves.

[0039] It should be noted that the outer mesh 2-1 and the inner mesh 2-2 can be a ring structure formed by welding the ends of rectangular plates together.

[0040] The upper and lower ends of the outer net 2-1 and the inner net 2-2 are installed into the annular mounting grooves on the opposite surfaces of the upper cover plate 2-3 and the lower cover plate 2-4. The purpose is twofold: first, to prevent desiccant leakage, and second, to increase the stability of the installation of the outer net 2-1 and the inner net 2-2 through a snap-fit ​​connection.

[0041] A fastening pin 2-5 is provided between the upper cover plate 2-3 and the lower cover plate 2-4. One end of the fastening pin 2-5 is stuck at the bottom of the lower cover plate 2-4, and the other end of the fastening pin 2-5 is threaded to the upper cover plate 2-3 through external threads. A countersunk is provided inside the fastening pin 2-5, and the fastening screw 1-9 passes through the fastening pin 2-5 and is threaded to the lower part of the mounting cover plate 1-1.

[0042] The fastening pin 2-5 connects the upper cover plate 2-3, the lower cover plate 2-4, the outer mesh 2-1 and the inner mesh 2-2 together. The fastening pin 2-5 has a countersunk plate in the middle, and the fastening screw 1-9 can pass through the fastening pin 2-5 to fix the above-mentioned adsorbent box assembly 1-8 to the lower part of the mounting cover plate 1-1.

[0043] The specific working principle of the above embodiments is as follows:

[0044] 1) Drying section installation: Install the upper and lower ends of the outer mesh 2-1 and inner mesh 2-2 into the annular mounting grooves on the opposite surfaces of the upper cover plate 2-3 and lower cover plate 2-4. Then, use multiple fastening pins 2-5 to pass evenly through the lower cover plate 2-4, with the fastening pins 2-5 located between the outer mesh 2-1 and inner mesh 2-2. Finally, connect the top of the fastening pins 2-5 to the upper cover plate 2-3 with threads, so that the outer mesh 2-1, inner mesh 2-2, upper cover plate 2-3, and lower cover plate 2-4 constitute the adsorbent box assembly 1-8. Secure the adsorbent box assembly 1-8 to the lower part of the mounting cover plate 1-1 by passing fastening screws 1-9 through the fastening pins 2-5, thus completing the drying section installation.

[0045] 2) Installation of the explosion-proof part: Fix the clamping frame 1-3 to the upper part of the mounting cover plate 1-1 using the clamping frame fastening bolts 1-6. Install the rupture disc 1-4 in the pressure relief hole in the middle of the clamping frame 1-3. Fix the rupture disc 1-4 by the compression mechanism. The compression mechanism can be a mounting groove that fits the rupture disc 1-4 at the bottom of the clamping frame 1-3. After installing the rupture disc 1-4 in the mounting groove, the clamping frame 1-3 can effectively fix the rupture disc 1-4.

[0046] During operation, the desiccant inside the adsorbent box assembly 1-8 continuously dries the insulating gas inside the device, ensuring its insulation performance. When the device is depressurized, the rupture disc 1-4 breaks under pressure, and the high-pressure gas is removed through the pressure relief hole, thus completing the depressurization.

[0047] Example 2:

[0048] Based on Example 1, please refer to Figure 1 and Figure 2 The explosion-proof device is also equipped with a flow guide 1-2 on the top. The flow guide 1-2 is used to guide the gas and impurities released during operation to the radial direction of the flow guide 1-2.

[0049] The air deflector 1-2 is fixed to the upper part of the mounting cover 1-1 by the air deflector fastening bolts 1-7.

[0050] The difference from Embodiment 1 is that this embodiment has a flow guide shroud 1-2 installed above the entire explosion-proof device. The purpose of this flow guide shroud is to redirect the released gas and impurities from direct injection to a predetermined direction, thereby improving the safety of the device. The flow guide shroud 1-2 is fixed to the upper part of the mounting cover plate 1-1 using fastening bolts 1-7. Figure 1 As shown, the deflector 1-2 is in a semi-open state and is bowl-shaped. Its edge is fixed to the mounting cover 1-1, and a guide port is vertically cut along its axis on the deflector 1-2. The position of the guide port should avoid the direct spraying of the released gas and impurities. At the same time, the specific direction of the guide port can be adjusted according to the actual situation.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A foreign matter adsorption and explosion-proof combination device for gas-insulated equipment, comprising a mounting cover plate (1-1), wherein the mounting cover plate (1-1) has a pressure relief hole reserved in the middle, and the mounting cover plate (1-1) is also provided with an assembly hole for installing the mounting cover plate (1-1) to a reserved position of the gas-insulated equipment, and the mounting cover plate (1-1) above the pressure relief hole is provided with an explosion-proof device, characterized in that: The mounting cover plate (1-1) at the lower part of the pressure relief hole is provided with an adsorbent box assembly (1-8), wherein, The adsorbent box assembly (1-8) includes an outer mesh (2-1), an inner mesh (2-2), an upper cover plate (2-3), and a lower cover plate (2-4). The upper cover plate (2-3) and the lower cover plate (2-4) are two annular plates, and a cover plate through hole corresponding to the position of the middle hole of the mounting cover plate (1-1) is reserved in the middle of the upper cover plate (2-3) and the lower cover plate (2-4). An annular and porous outer mesh (2-1) and inner mesh (2-2) are arranged radially from the outside to the inside of the adsorbent box assembly (1-8) between the upper cover plate (2-3) and the lower cover plate (2-4). The outer mesh (2-1), inner mesh (2-2), upper cover plate (2-3), and lower cover plate (2-4) are assembled to form an annular space for placing desiccant. The adsorbent box assembly (1-8) is fixedly installed to the lower part of the mounting cover plate (1-1) by fastening screws (1-9).

2. The foreign matter adsorption and explosion-proof combination device for gas insulation equipment according to claim 1, characterized in that, The explosion-proof device includes a clamping frame (1-3), a rupture disc (1-4), and a sealing ring (1-5). The clamping frame (1-3) is fitted and installed on the upper part of the mounting cover plate (1-1). The clamping frame (1-3) has a through hole in the middle that corresponds to the position of the middle hole of the mounting cover plate (1-1). A rupture disc (1-4) is installed inside the through hole of the clamping frame (1-3) to isolate the upper and lower sides of the through hole. The clamping frame (1-3) is fixedly installed on the upper part of the mounting cover plate (1-1) by clamping frame fastening bolts (1-6).

3. The foreign matter adsorption and explosion-proof combination device for gas insulation equipment according to claim 2, characterized in that, The mounting cover plate (1-1) at the bottom of the clamping frame (1-3) is provided with an annular sealing groove, and a sealing ring (1-5) is installed in the annular sealing groove; the annular sealing groove and the sealing ring (1-5) are provided with double channels.

4. The foreign matter adsorption and explosion-proof combination device for gas insulation equipment according to claim 3, characterized in that, The explosion-proof device is also equipped with a flow guide shroud (1-2) on top of the whole. The flow guide shroud (1-2) is used to guide the gas and impurities released during operation to the radial direction of the flow guide shroud (1-2).

5. The foreign matter adsorption and explosion-proof combination device for gas insulation equipment according to claim 4, characterized in that, The flow guide (1-2) is fixed to the upper part of the mounting cover plate (1-1) by the flow guide fastening bolts (1-7).

6. The foreign matter adsorption and explosion-proof combination device for gas insulation equipment according to claim 5, characterized in that, The diameter of the through hole in the middle of the upper cover plate (2-3) and the lower cover plate (2-4) and the middle hole in the mounting cover plate (1-1) shall not be less than the diameter of the through hole in the clamping frame (1-3).

7. The foreign matter adsorption and explosion-proof combination device for gas insulation equipment according to claim 2, characterized in that, The upper cover plate (2-3) and the lower cover plate (2-4) have pre-reserved annular mounting grooves for assembling the outer mesh (2-1) and the inner mesh (2-2) on their opposite surfaces. The upper and lower ends of the outer mesh (2-1) and the inner mesh (2-2) are inserted into the upper cover plate (2-3) and the lower cover plate (2-4) through the annular mounting grooves.

8. The foreign matter adsorption and explosion-proof combination device for gas insulation equipment according to claim 1, characterized in that, A fastening pin (2-5) is provided between the upper cover plate (2-3) and the lower cover plate (2-4). One end of the fastening pin (2-5) is locked at the bottom of the lower cover plate (2-4), and the other end of the fastening pin (2-5) is threaded to the upper cover plate (2-3) through an external thread. A countersunk is provided inside the fastening pin (2-5), and the fastening screw (1-9) passes through the fastening pin (2-5) and is threaded to the lower part of the mounting cover plate (1-1).

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