Sealing structure of operating shaft of environment-friendly gas switch cabinet mechanism

Abstract

The utility model relates to a sealing structure of an operation shaft of an environment-friendly gas switch cabinet mechanism, and belongs to the technical field of gas switch cabinets. The sealing device comprises an operation shaft, a sealing air chamber wall and a sealing sleeve, the operation shaft penetrates through the sealing air chamber wall and enters the sealing air chamber, the sealing sleeve is in a bowl-shaped half buckle shape, the end, with a smaller opening, of the sealing sleeve is fixed to the operation shaft in a sleeving mode and rotates along with the operation shaft, the other end of the sealing sleeve abuts against the sealing air chamber wall, and the sealing air chamber wall is fixed to the sealing sleeve. And the sealing sleeve is matched with the wall of the sealing air chamber to form a closed space. The sealing structure has the effect that the sealing performance of the operation shaft is better.

Description

Technical Field

[0001] The present application relates to the field of insulated high-voltage switchgear, and in particular to a sealing structure for an operating shaft of an environmentally friendly gas switchgear mechanism. Background Art

[0002] The high-voltage switchgear covered by this patent is a complete set of AC high-voltage switchgear with a rated voltage of 3.6kV to 40.5kV and a rated frequency of 50Hz. It is suitable for use in power distribution systems in power plants, substations, industrial and mining enterprises, residential communities, high-rise buildings, schools, parks, and other locations, serving as high-voltage switchgear for receiving and distributing electrical energy and for controlling, protecting, and detecting circuits.

[0003] Gas-insulated high-voltage switchgear is a metal-enclosed high-voltage switchgear that uses gas insulation. The rated voltage levels covered by this patent are 3.6kV to 40.5kV. The main feature of this type of equipment is that the live electrical components required for the high-voltage primary circuit are completely sealed in a gas box filled with insulating gas; the insulating gas mostly uses low-pressure SF6 gas, N2 gas or a mixed gas as the insulating medium.

[0004] SF6 gas, a greenhouse gas, has a significant impact and a long decay period. Leakage of insulating gas in switchgear can have a significant impact on the environment. To mitigate these issues, environmentally friendly gas-insulated high-voltage switchgear has come into use. Ensuring tightness and controlling leakage of insulating gas within switchgear is crucial, especially preventing SF6 gas leaks. Preventing leakage in environmentally friendly gas-insulated high-voltage switchgear is primarily aimed at maintaining switchgear performance.

[0005] Since the operation of the switch cabinet needs to be completed through the rotation process of the operating shaft, due to the rotating characteristics of the operating shaft, the contact point between the operating shaft and the sealed air chamber in the switch cabinet is the most prone to leakage. The conventional method is to use dynamic seals, which are the main hidden dangers of air box leakage. Therefore, the sealing effect still has a lot of room for improvement. Utility Model Content

[0006] In order to improve the sealing performance of the operating shaft of a gas-insulated high-voltage switchgear, the present application provides a sealing design for the operating shaft of an environmentally friendly gas-insulated high-voltage switchgear mechanism.

[0007] The present application provides a sealing structure for the operating shaft of an environmentally friendly gas switchgear mechanism, which adopts the following technical solution:

[0008] A sealing structure for an operating shaft of an environmentally friendly gas switch cabinet mechanism comprises an operating shaft, a sealing air chamber wall and a sealing sleeve. The operating shaft passes through the sealing air chamber wall and enters the sealing air chamber. The sealing sleeve is bowl-shaped and half-buckled. The end of the sealing sleeve with a smaller opening is fixed on the operating shaft and rotates with the operating shaft. The other end of the sealing sleeve abuts the sealing air chamber wall. The sealing sleeve cooperates with the sealing air chamber wall to form a closed space.

[0009] By adopting the above technical solution, a sealing sleeve is provided between the operating shaft and the wall of the sealed air chamber, and the closed space formed by the sealing sleeve isolates the contact position between the operating shaft and the wall of the sealed air chamber. The insulating gas in the sealed air chamber is blocked by the sealing sleeve, thereby achieving the purpose of improving the sealing between the operating shaft and the sealed air chamber. Since the sealing sleeve has a certain elasticity, one end of the sealing sleeve is fixed to the operating shaft, so that gas is not easily leaked between the sealing sleeve and the operating shaft, and the sealing sleeve abuts against the wall of the sealed air chamber under the action of elasticity and is not easily leaked. At the same time, the sealing sleeve also maintains an abutment state with the wall of the sealed air chamber under the action of air pressure.

[0010] Optionally, one end of the operating shaft for installing the sealing sleeve is a stepped column and is formed with an inner stepped surface, the sealing sleeve abuts the inner stepped surface, and the operating shaft is also fitted with a mounting sleeve, and the mounting sleeve cooperates with the inner stepped surface to clamp and fix the sealing sleeve.

[0011] By adopting the above technical solution, the sealing sleeve is clamped and fixed by the mounting sleeve and the inner stepped surface, so that the sealing sleeve will not twist relative to the operating shaft when the operating shaft rotates, thereby better maintaining the sealing state between the sealing sleeve and the operating shaft.

[0012] Optionally, the operating shaft is further provided with a covering plate, and the inner wall of the covering plate covers and fits a portion of the outer wall of the sealing sleeve.

[0013] By adopting the above technical solution, the presence of the covering plate prevents the sealing sleeve from undergoing reverse elastic deformation to a state where the opening faces the opposite direction. The presence of the covering plate also better maintains the abutment state between the sealing sleeve and the sealing air chamber wall.

[0014] Optionally, one end of the sealing sleeve abuts against the sealing air chamber wall and is fixed to the sealing air chamber wall to maintain sealing.

[0015] By adopting the above technical solution, the sealing sleeve and the sealing air chamber wall are also fixed in a fixed manner, so that the sealing between the sealing sleeve and the sealing air chamber wall is maintained in the best state, and ultimately the sealing of the operating shaft on the switch cabinet is improved. Since the sealing sleeve has elastic characteristics including torsional properties, when the operating shaft is rotated for operation, the elastic deformation of the sealing sleeve can maintain the sealing state without affecting the rotation of the operating shaft.

[0016] Optionally, the mounting sleeve includes a first sleeve and a second sleeve, the first sleeve is rotatably connected to the second sleeve, the sealing sleeve abuts against the inner wall of one end of the sealing air chamber wall and is provided with an annular portion, the first sleeve abuts against the annular portion, and the second sleeve clamps and fixes the sealing sleeve with the inner step surface.

[0017] By adopting the above technical solution, the mounting sleeve is set as the first shaft sleeve and the second shaft sleeve, the first shaft sleeve and the second shaft sleeve respectively clamp the two ends of the fixed sealing sleeve, and the first shaft sleeve and the second shaft sleeve are rotatably connected, so that the rotation of the operating shaft is not affected. At the same time, the mounting sleeve can clamp the two ends of the fixed mounting sleeve at the same time, and the structure is simple and effective.

[0018] Optionally, the intermediate state of the rotational position of the operating shaft is the unstressed state of the sealing sleeve.

[0019] By adopting the above technical solution, the rotation angle of the sealing sleeve when the operating shaft rotates is as small as possible, which reduces the requirements for the elastic torsion range of the sealing sleeve. The elastic torsion range of the sealing sleeve is smaller and is less likely to fail.

[0020] Optionally, an outer sealing sleeve is provided between one end of the operating shaft outside the sealing air chamber and the sealing air chamber wall, one end of the outer sealing sleeve is sealed and fixed to the sealing air chamber wall, and the other end of the outer sealing sleeve is sealed and fixed to the operating shaft.

[0021] By adopting the above technical solution, the outer sealing sleeve is used to further seal the end of the operating shaft outside the sealed air chamber, thereby further improving the sealing performance of the switch cabinet, and the outer sealing sleeve outside the sealed air chamber is less likely to fail.

[0022] Optionally, the end of the operating shaft located outside the sealed air chamber is also a stepped column and is formed with an outer stepped surface, the outer stepped surface is oriented in the same direction as the inner stepped surface, and a filling sleeve is installed at the end of the operating shaft located outside the sealed air chamber, the outer diameter of the filling sleeve is consistent with the larger diameter of the end of the operating shaft located outside the sealed air chamber, and the outer sealing sleeve is clamped and fixed between the outer stepped surface and the filling sleeve.

[0023] By adopting the above technical solution, the installation and disassembly of the outer sealing sleeve is made more convenient, and the replacement operation can be carried out more conveniently on the outside. It is beneficial that when the seal of the switch cabinet fails at the operating shaft after long-term use, the sealing state can be restored by replacing the outer sealing sleeve.

[0024] To sum up, by arranging a sealing sleeve between the operating shaft and the wall of the sealed air chamber, the closed space formed by the sealing sleeve isolates the contact position between the operating shaft and the wall of the sealed air chamber, and the gas in the sealed air chamber is blocked by the sealing sleeve, thereby achieving the purpose of improving the sealing between the operating shaft and the sealed air chamber. Since the sealing sleeve has a certain elasticity, one end of the sealing sleeve is fixed to the operating shaft, so that gas is not easy to leak between the sealing sleeve and the operating shaft, and the sealing sleeve abuts against the wall of the sealed air chamber under the action of elasticity and is not easy to leak gas. At the same time, the sealing sleeve also maintains an abutment state with the wall of the sealed air chamber under the action of air pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional view of the sealing design in an embodiment of the present application;

[0026] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 yes Figure 1 Enlarged view of point B in the middle.

[0028] Explanation of the accompanying drawings: 1. Operating shaft; 11. Inner step surface; 12. Outer step surface; 13. Covering plate; 2. Mounting sleeve; 21. First sleeve; 22. Second sleeve; 23. Mounting groove; 24. Bearing; 25. Clamping groove; 3. Sealing sleeve; 31. Annular portion; 4. Outer sealing sleeve; 41. Outer ring; 5. Filling sleeve; 6. Sealing air chamber wall; 61. Connecting convex ring; 62. Mounting ring; 7. Enclosed space; 8. Fastening cover. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-3 This application is described in further detail.

[0030] An embodiment of the present application discloses a sealing structure for an operating shaft of an environmentally friendly gas switch cabinet mechanism.

[0031] Reference Figure 1 A sealing structure for an operating shaft of an environmentally friendly gas switch cabinet mechanism includes an operating shaft 1, an installation sleeve 2, a sealing sleeve 3, an outer sealing sleeve 4, a filling sleeve 5, and a matching sealing air chamber wall 6 for the operating shaft 1 to pass through and install. The sealing air chamber wall 6 is part of the sealing air chamber, and the sealing air chamber wall 6 and other parts of the sealing air chamber can be fixed by welding to form a final sealed air chamber.

[0032] Reference Figure 1 and Figure 2, wherein one end of the operating shaft 1 passes through the sealed air chamber wall 6 and enters the sealed air chamber for operating the electrical components in the sealed air chamber, and the other end of the operating shaft 1 is located outside the sealed air chamber. The operating shaft 1 is a three-section stepped column, and the diameter of the operating shaft 1 from one end to the other end in the sealed air chamber is reduced twice in sequence, and the part of the operating shaft 1 passing through the sealed air chamber wall 6 is the intermediate diameter part, and a dynamic seal connection method can be adopted between the operating shaft 1 and the sealed air chamber wall 6. The end with a larger diameter of the operating shaft 1 is located in the sealed air chamber and the above-mentioned mounting sleeve 2 and sealing sleeve 3 are installed. The end with a smaller diameter of the operating shaft 1 is located outside the sealed air chamber and the above-mentioned outer sealing sleeve 4 and filling sleeve 5 are installed. During installation, the installation process of the operating shaft 1 in the sealed air chamber is completed first, and then the process of the operating shaft 1 passing through the sealed air chamber wall 6 is completed, and finally the welding and fixation of the sealed air chamber wall 6 to the other parts of the sealed air chamber is completed.

[0033] The above-mentioned sealing sleeve 3 is used for sealing the operating shaft 1 in the sealing air chamber, and the installation sleeve 2 is used to tighten the sealing sleeve 3. Specifically, the step surface of the operating shaft 1 in the sealing air chamber is set as the inner step surface 11, and the sealing sleeve 3 is bowl-shaped and half-buckled. The operating shaft 1 is also integrally provided with a covering plate 13 at the position of the inner step surface 11. The covering plate 13 is also bowl-shaped, and the inner wall of the covering plate 13 covers and fits part of the outer wall of the sealing sleeve 3. The end with the smaller opening of the sealing sleeve 3 is fixed on the operating shaft 1 and the end face abuts the inner step surface 11. The end with the larger opening of the sealing sleeve 3 abuts the sealing air chamber wall 6, and the inner wall of the end of the sealing sleeve 3 abutting the sealing air chamber wall 6 is integrally extended with an annular portion 31. The installation sleeve 2 includes a first sleeve 21 and a second sleeve 22. The first sleeve 21 It is rotatably connected to the second sleeve 22. Specifically, the outer diameter of the first sleeve 21 is larger than the outer diameter of the second sleeve 22. A mounting groove 23 is provided at one end of the first sleeve 21 and a bearing 24 is embedded therein. One end of the second sleeve 22 is inserted into the inner ring of the bearing 24 to realize the rotatable connection with the first sleeve 21, and the other end is clamped and fixed with the inner step surface 11. The sealing air chamber wall 6 and the operating shaft 1 are coaxially protruded with a connecting convex ring 61. The inner wall of the end of the first sleeve 21 away from the second sleeve 22 is threadedly connected to the outer wall of the connecting convex ring 61. A clamping groove 25 for the annular portion 31 to be embedded therein is provided on the outer side of the first sleeve 21 away from the second sleeve 22. The first sleeve 21 abuts against the annular portion 31 to realize the clamping and fixation between the sealing sleeve 3 and the sealing air chamber wall 6.

[0034] Finally, the sealing sleeve 3 cooperates with the sealing air chamber wall 6 to form a closed space 7. At the same time, the intermediate state of the rotation position of the operating shaft 1 is the unstressed state of the sealing sleeve 3. The forward and reverse rotation of the operating shaft 1 can realize the operation of the electrical equipment in the switch cabinet. At this time, the sealing sleeve 3 is elastically deformed. At the same time, in order to prevent the elasticity of the sealing sleeve 3 from driving the operating shaft 1 and the elastic deformation of the sealing sleeve 3 is small, the size of the sealing sleeve 3 along the axial direction of the operating shaft 1 can be larger, and the specific length of the sealing sleeve 3 can be adjusted according to demand. At the same time, a corresponding locking structure can be provided at the end of the operating shaft 1 outside the sealing air chamber to keep the operating shaft 1 in the required state, thereby ensuring that the control function of the operating shaft 1 is not affected by the elasticity of the sealing sleeve 3.

[0035] Reference Figure 1 and Figure 3 The above-mentioned outer sealing sleeve 4 is used to seal the end of the operating shaft 1 outside the sealed air chamber, and the filling sleeve 5 is used to fasten the outer sealing sleeve 4. Specifically, the outer sealing sleeve 4 is also bowl-shaped and inverted on the sealing air chamber wall 6. The step surface of the operating shaft 1 outside the sealed air chamber is set as the outer step surface 12. The inner wall of the end with the smaller opening of the outer sealing sleeve 4 abuts the outer step surface 12. The outer diameter of the filling sleeve 5 is consistent with the diameter in the middle of the operating shaft 1. The filling sleeve 5 is fixed on the end with the smallest diameter of the operating shaft 1, and the outer sealing sleeve 4 is clamped and fixed between the outer step surface 12 and the filling sleeve 5. The filling sleeve 5 can be pin-connected or threaded. Since the operating shaft 1 needs to be rotated, in order to reduce the influence of the filling sleeve 5, the filling sleeve 5 and the operating shaft 1 are preferably pin-connected. At this time, the end with the smallest size of the operating shaft 1 can adopt a polygonal prism, and the filling sleeve 5 is correspondingly adapted and assembled and pin-connected.

[0036] The end with the larger opening of the outer sealing sleeve 4 is fixedly connected to the sealing air chamber wall 6. Specifically, the outer sealing sleeve 4 is integrally extended from the outside of one end of the sealing air chamber wall 6, and the sealing air chamber wall 6 is protruding with a mounting ring 62 for embedding the outer ring 41. The mounting ring 62 is threadedly mounted with a fastening cover 8 with a middle opening, and the fastening cover 8 clamps and fixes the mounting ring 62.

[0037] The mounting ring 62 can also be fixed to the sealing chamber wall 6 by simple screws, or the fastening cover 8 can be fixed by screws.

[0038] At the same time, in order to consider the operating space of the operating shaft 1, the size of the outer sealing sleeve 4 in the axial direction of the operating shaft 1 can be shorter than the sealing sleeve 3, and accordingly the life is shorter under severe elastic deformation, but because it can be easily removed and replaced, it can be easily maintained by replacement.

[0039] At the same time, the sealing sleeve 3 can also be fixed by setting an outer ring 41 in the same way as the outer sealing sleeve 4. At this time, the mounting sleeve 2 is directly fixed to the operating shaft 1 and rotates together. The fixing method of the mounting sleeve 2 can be threaded connection or interference fit.

[0040] In another embodiment, the sealing chamber wall 6 may also be provided with a groove for direct radial extrusion installation of the outer ring 41 for direct fixation.

[0041] The implementation principle of the sealing structure of the operating shaft of an environmentally friendly gas switch cabinet mechanism in an embodiment of the present application is as follows: a sealing sleeve 3 is arranged between the operating shaft 1 and the sealing air chamber wall 6, and the closed space 7 formed by the sealing sleeve 3 isolates the contact position between the operating shaft 1 and the sealing air chamber wall 6. The gas in the sealing air chamber is blocked by the sealing sleeve 3, thereby achieving the purpose of improving the sealing between the operating shaft 1 and the sealing air chamber.

[0042] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A sealing structure for an operating shaft of an environmentally friendly gas switchgear mechanism, characterized by: The invention comprises an operating shaft (1), a sealing air chamber wall (6) and a sealing sleeve (3), wherein the operating shaft (1) passes through the sealing air chamber wall (6) and enters the sealing air chamber, and the sealing sleeve (3) is in a bowl-shaped half buckle, and the end of the sealing sleeve (3) with a smaller opening is fixed on the operating shaft (1) and rotates with the operating shaft (1), and the other end of the sealing sleeve (3) abuts against the sealing air chamber wall (6), and the sealing sleeve (3) cooperates with the sealing air chamber wall (6) to form a closed space (7).

2. The sealing structure of the operating shaft of the environmental protection gas switch cabinet mechanism according to claim 1, characterized in that: One end of the operating shaft (1) for mounting the sealing sleeve (3) is a stepped column and is formed with an inner stepped surface (11). The sealing sleeve (3) abuts against the inner stepped surface (11). The operating shaft (1) is also fitted with a mounting sleeve (2). The mounting sleeve (2) cooperates with the inner stepped surface (11) to clamp and fix the sealing sleeve (3).

3. The sealing structure of the operating shaft of the environmental protection gas switch cabinet mechanism according to claim 1, characterized in that: The operating shaft (1) is further provided with a covering plate (13), the inner wall of the covering plate (13) covering and fitting a portion of the outer wall of the sealing sleeve (3).

4. The sealing structure for the operating shaft of an environmentally friendly gas switch cabinet mechanism according to claim 1, characterized in that: One end of the sealing sleeve (3) abuts against the sealing air chamber wall (6) and is fixed to the sealing air chamber wall (6) to maintain a seal.

5. The sealing structure of the operating shaft of the environmental protection gas switch cabinet mechanism according to claim 2, characterized in that: The mounting sleeve (2) includes a first sleeve (21) and a second sleeve (22), the first sleeve (21) and the second sleeve (22) being rotatably connected, the sealing sleeve (3) abutting against the inner wall of one end of the sealing air chamber wall (6) and extending therefrom to be provided with an annular portion (31), the first sleeve (21) abutting against the annular portion (31), and the second sleeve (22) and the inner stepped surface (11) clamping and fixing the sealing sleeve (3).

6. The sealing structure of the operating shaft of the environmental protection gas switch cabinet mechanism according to claim 5, characterized in that: The intermediate state of the rotational position of the operating shaft (1) is the unstressed state of the sealing sleeve (3).

7. The sealing structure of the operating shaft of the environmental protection gas switch cabinet mechanism according to claim 2, characterized in that: An outer sealing sleeve (4) is provided between one end of the operating shaft (1) located outside the sealed air chamber and the sealed air chamber wall (6); one end of the outer sealing sleeve (4) is sealed and fixed to the sealed air chamber wall (6), and the other end of the outer sealing sleeve (4) is sealed and fixed to the operating shaft (1).

8. The sealing structure for the operating shaft of an environmentally friendly gas switch cabinet mechanism according to claim 7, characterized in that: The end of the operating shaft (1) outside the sealed air chamber is also a stepped column and is formed with an outer stepped surface (12). The outer stepped surface (12) is oriented in the same direction as the inner stepped surface (11). A filling sleeve (5) is installed at the end of the operating shaft (1) outside the sealed air chamber. The outer diameter of the filling sleeve (5) is consistent with the larger diameter of the end of the operating shaft (1) outside the sealed air chamber. The outer sealing sleeve (4) is clamped and fixed between the outer stepped surface (12) and the filling sleeve (5).

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