Insulation pull rod sealing structure and circuit breaker

Abstract

The utility model relates to the field of parts of gas insulation device shells, in particular to an insulation pull rod sealing structure and a circuit breaker. A circuit breaker comprises an insulation pull rod sealing structure, the insulation pull rod sealing structure comprises a sealing chamber and an insulation pull rod slidably penetrating the sealing chamber, a corrugated pipe is sleeved on the insulation pull rod, one end of the corrugated pipe is in sealing connection with a head end flange, and the other end of the corrugated pipe is in sealing connection with the sealing chamber. The insulating pull rod is installed in the corrugated pipe in a penetrating mode and penetrates through the head end flange, a sealing structure is arranged between the head end flange and the insulating pull rod to seal the insulating pull rod and the head end flange, and the insulating pull rod is further provided with a fixing structure for fixing the head end flange and the insulating pull rod in the axial direction. The insulating pull rod sealing structure solves the problem that an insulating pull rod is difficult to rotate in the combined installation process due to the fact that an existing insulating pull rod sealing structure of the circuit breaker achieves sealing of the insulating pull rod and a corrugated pipe through welding.

Description

Technical Field

[0001] The utility model relates to the field of parts of gas insulation device casings, in particular to an insulating rod sealing structure and a circuit breaker. Background Art

[0002] In the prior art, both vacuum circuit breakers and insulated gas circuit breakers involve insulating rods, which are connected to the moving contact and drive the moving contact and the static contact to close or open. However, a good sealing environment needs to be ensured in both vacuum circuit breakers and insulated gas circuit breakers, especially in vacuum circuit breakers. In order to ensure the structural strength of the entire circuit breaker, a certain amount of gas needs to be filled into the circuit breaker. However, if the gas enters the vacuum arc extinguishing chamber, it will seriously affect the actual performance of the vacuum arc extinguishing chamber. Therefore, it is necessary to seal the connection where the insulating rod extends into the gas box. However, if a sealing ring is simply used to achieve the sealing between the insulating rod and the gas box, since the insulating rod needs to move at a faster speed, the sealing effect between the two will be poor.

[0003] The Chinese utility model patent with the authorization announcement number CN213304813U discloses a sealing structure of the insulating pull rod of the gas-filled switch cabinet, specifically: gas box, bellows, flange, seal, sealed pole, insulating pull rod, aluminum plate, fixing device; the mounting aluminum plate is fixed on the gas box, the sealed pole is fixed on the mounting aluminum plate, the insulating pull rod is directly mounted on the conductor part of the sealed pole, and the bellows is mounted on the insulating pull rod; the bellows includes two parts: the bellows body part and the bellows cover part below, the flange mounts the bellows on the aluminum plate; the flange presses the bellows through the fixing device, so that it can achieve a sealing effect with the gas box through the seal. A sealing ring groove is provided on the bellows cover part, and the seal is installed in the sealing ring groove. In the technical solution disclosed in the patent, a bellows is installed on the insulating pull rod, one end of the bellows is welded and fixed to the insulating pull rod to achieve sealing, and the other end is sealed and fixed to the gas box through the flange. In this way, there is a static seal between the bellows and the insulating rod, and there is a static seal between the bellows and the air box. Converting dynamic seals into static seals greatly improves the sealing effect.

[0004] One end of the insulating rod is connected to the operating mechanism, and the other end is connected to the moving contact. When assembling the circuit breaker, the moving contact needs to be rotated to a certain extent so that the moving contact and the static contact are in a positive state when closing the circuit breaker to achieve the best opening and closing effect. However, if the technical solution disclosed in the patent is adopted to connect the end of the bellows to the insulating rod by welding, it is relatively difficult to rotate the insulating rod, which greatly increases the difficulty of assembly. Utility Model Content

[0005] The utility model aims to provide an insulating rod sealing structure to solve the problem that the insulating rod sealing structure in the prior art realizes the sealing of the insulating rod and the bellows by welding, which makes it difficult to rotate the insulating rod during the assembly and installation process. The utility model also provides a circuit breaker to solve the problem that the insulating rod sealing structure of the prior art circuit breaker realizes the sealing of the insulating rod and the bellows by welding, which makes it difficult to rotate the insulating rod during the assembly and installation process.

[0006] An insulating pull rod sealing structure comprises a sealing chamber and an insulating pull rod slidably installed in the sealing chamber, a bellows is mounted on the insulating pull rod, one end of the bellows is sealingly connected to a head end flange, the other end of the bellows is sealingly connected to the sealing chamber, the insulating pull rod is installed in the bellows and passes through the head end flange, a sealing structure is arranged between the head end flange and the insulating pull rod to seal the insulating pull rod and the head end flange, and a fixing structure is also arranged on the insulating pull rod to fix the head end flange and the insulating pull rod in the axial direction.

[0007] Furthermore, a stop boss that cooperates with the head end flange of the bellows is provided on the insulating pull rod, and a pressure ring is also fixed on the insulating pull rod. The pressure ring cooperates with the stop boss to fix the head end flange of the bellows and the insulating pull rod, and the stop boss and the pressure ring together constitute a fixed structure.

[0008] Furthermore, a threaded section is provided on the insulating pull rod, and the pressure ring is a threaded sleeve. The pressure ring is screwed on the threaded section and cooperates with the stop boss to clamp the head end flange.

[0009] Furthermore, an end flange is provided at the other end of the bellows, and the end flange is connected to the sealing chamber by bolts and presses the sealing ring onto the sealing chamber to achieve a sealed connection between the bellows and the sealing chamber.

[0010] The utility model improves the prior art. Specifically, the utility model seals the insulating pull rod and the head end flange of the bellows by setting a sealing structure, and fixes the head end flange of the bellows to the insulating pull rod by a fixing structure, so that when the insulating pull rod moves, the head end flange of the bellows can follow the movement of the insulating pull rod. Since the utility model adopts a fixing structure to fix the head end flange of the bellows and the insulating pull rod in the axial direction, the insulating pull rod can rotate in the circumferential direction. The insulating pull rod can rotate relative to the bellows, thereby reducing the difficulty of rotating the insulating pull rod, and solving the problem that the insulating pull rod structure in the prior art realizes the sealing of the insulating pull rod and the bellows by welding, which makes it difficult to rotate the insulating pull rod during the combined installation process.

[0011] A circuit breaker includes an insulating rod sealing structure, which includes a sealed chamber and an insulating rod slidably mounted on the sealed chamber, a bellows is mounted on the insulating rod, one end of the bellows is sealedly connected to a head end flange, and the other end of the bellows is sealedly connected to the sealed chamber, the insulating rod is mounted in the bellows and passes through the head end flange, a sealing structure is provided between the head end flange and the insulating rod to seal the insulating rod and the head end flange, and a fixing structure is also provided on the insulating rod to fix the head end flange and the insulating rod in the axial direction.

[0012] Furthermore, a stop boss that cooperates with the head end flange of the bellows is provided on the insulating pull rod, and a pressure ring is also fixed on the insulating pull rod. The pressure ring cooperates with the stop boss to fix the head end flange of the bellows and the insulating pull rod, and the stop boss and the pressure ring together constitute a fixed structure.

[0013] Furthermore, a threaded section is provided on the insulating pull rod, and the pressure ring is a threaded sleeve. The pressure ring is screwed on the threaded section and cooperates with the stop boss to clamp the head end flange.

[0014] Furthermore, an end flange is provided at the other end of the bellows, and the end flange is connected to the sealing chamber by bolts and presses the sealing ring onto the sealing chamber to achieve a sealed connection between the bellows and the sealing chamber.

[0015] The utility model improves the prior art. Specifically, the utility model fixes the insulating rod and the head end flange of the bellows by setting a fixed structure, so that when the insulating rod moves, the head end flange of the bellows can move with the insulating rod, and at the same time, the insulating rod and the bellows are prevented from leaking through a sealing structure to avoid affecting the external gas in the cavity. In addition, compared with the prior art, the utility model fixes the head end flange of the bellows and the insulating rod in the axial direction through a fixed structure, and the insulating rod can rotate in the circumferential direction, which saves time and effort when adjusting the insulating rod, and solves the problem that the insulating rod sealing structure of the existing circuit breaker realizes the sealing of the insulating rod and the bellows by welding, which makes it difficult to rotate the insulating rod during the combined installation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 : A cross-sectional view of the insulating rod sealing structure of the circuit breaker of the first embodiment of the utility model.

[0017] In the figure: 1. Sealing chamber; 11. Connecting flange; 2. Insulating pull rod; 21. Stop boss; 3. Bellows; 31. Head end flange; 32. End flange; 4. Pressing ring; 5. Guide ring; 6. Guide sleeve; 7. Sealing ring; 8. Sealing structure. DETAILED DESCRIPTION

[0018] The basic concept of the circuit breaker of the utility model:

[0019] A circuit breaker comprises a sealed chamber and an insulating rod slidably mounted on the sealed chamber, wherein a bellows is mounted on the insulating rod, one end of the bellows is sealedly connected to a head end flange, and the other end of the bellows is sealedly connected to the sealed chamber, the insulating rod is mounted in the bellows and passes through the head end flange, a sealing structure is arranged between the head end flange and the insulating rod to seal the insulating rod and the head end flange, and a fixing structure is also arranged on the insulating rod to fix the head end flange and the insulating rod in the axial direction.

[0020] The utility model uses a fixed structure to make the head end flange of the bellows follow the movement of the insulating rod, and the bellows and the insulating rod are sealed by the sealing structure. Compared with welding in the prior art, the utility model uses a fixed structure to fix the head end flange of the bellows and the insulating rod in the axial direction, and when the insulating rod needs to be rotated, the insulating rod can be directly rotated.

[0021] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0022] Embodiment 1 of the circuit breaker of the utility model:

[0023] like Figure 1 As shown: a circuit breaker, including an insulating rod sealing structure, the insulating rod sealing structure includes a sealed chamber 1 and an insulating rod 2 slidably mounted on the sealed chamber 1, a bellows 3 is mounted on the insulating rod 2, one end of the bellows 3 is sealedly connected to a head end flange 31, the other end of the bellows 2 is sealedly connected to the sealed chamber 1, the insulating rod 2 is mounted in the bellows 3 and passes through the head end flange 31, a sealing structure 8 is arranged in the head end flange 31 to seal the insulating rod 2 and the head end flange 31, and a fixing structure is also arranged on the insulating rod 2 to fix the head end flange 31 and the insulating rod 2 in the axial direction. A through hole is provided at the head end of the bellows 3, an annular groove is provided on the hole wall of the through hole, and a sealing structure 8 is arranged in the annular groove to seal the insulating rod 2 and the head end flange 31 of the bellows 3.

[0024] The bellows 3 is a stainless steel bellows, and the head end flange 31 is welded to the bellows 3 to achieve a sealed connection.

[0025] The insulating pull rod 2 is provided with a fixing structure for fixing the head end flange 31 of the bellows 3. For example, two spaced pin holes can be provided on the insulating pull rod 2. The space between the pin holes is the thickness of the head end flange 31 of the bellows 3. The head end flange 31 of the bellows 3 is fixed to the insulating pull rod 2 by fixing pins inserted in the two pin holes. However, in the method of fixing the head end flange 31 of the bellows 3 by two fixing pins, it is necessary to first insert a fixing pin into the pin hole, and then fix the head end flange 31 of the bellows 3 by another fixing pin. However, in order to improve the structural strength of the fixing part, preferably: the insulating pull rod 2 is provided with a stop boss 21 that stops and cooperates with the head end flange 31 of the bellows 3, and the insulating pull rod 2 is also fixed with a pressure ring 4. The pressure ring 4 cooperates with the stop boss 21 to fix the head end flange 31 of the bellows 3 to the insulating pull rod 2, and the stop boss 21 and the pressure ring 4 together constitute a fixing structure. When the bellows 3 is sleeved on the insulating rod 2, the stop boss 21 on the insulating rod 2 is located outside the bellows 3, and the pressure ring 4 is located inside the bellows 3. Of course, in other embodiments, when the bellows 3 is sleeved on the insulating rod 2, the stop boss 21 can also be located inside the bellows 3, and the pressure ring 4 is located outside the bellows 3. The pressure ring 4 cooperates with the stop boss 21 to fix the head end flange 31 of the bellows 3. The fixing of the head end flange 31 of the bellows 3 is achieved by the cooperation between the pressure ring 4 and the stop boss 21, which has a relatively higher structural strength and is less prone to breakage.

[0026] The pressure ring 4 can be fixed to the insulating pull rod 2 in a variety of ways, for example: a pin hole is provided on the pressure ring 4, and a corresponding pin hole is also provided on the insulating pull rod 2. When the pressure ring 4 presses the upper end of the head end flange 31 of the bellows 3 against the stop boss 21 of the insulating pull rod 2, the fixing pin is inserted into the pin hole to fix the pressure ring 4. However, it is difficult to fix in this way, and the pressure ring 4 needs to be pushed hard so that the pressure ring 4 and the stop boss 21 clamp the head end flange 31 of the bellows 3 before the fixing pin is inserted. Therefore, preferably: a threaded section is provided on the insulating pull rod 2, and the pressure ring 4 is a screw sleeve. The pressure ring 4 is screwed on the threaded section and cooperates with the stop boss 21 to clamp the head end flange 31. The insulating pull rod 2 is provided with an external thread, and the pressure ring 4 is provided with an internal thread that matches the external thread on the insulating pull rod 2. The pressing ring 4 is connected to the insulating pull rod 2 by threads, which has a relatively good connection effect and saves more effort when clamping the head end flange 31 of the corrugated pipe 3.

[0027] The bellows 3 can be sealed and connected to the sealed chamber 1 by welding, and the wall of the sealed chamber and the other end of the bellows 3 are welded together. However, by welding, the bellows 3 is directly fixed to the sealed chamber 1, so that it cannot be disassembled. Therefore, preferably: the other end of the bellows 3 is sealed and connected with the end flange 32, and the end flange 32 is sealed and connected to the bellows 3 by welding, and the end flange 32 is connected to the sealed chamber 1 by bolts and the sealing ring 7 is pressed on the sealed chamber 1 to achieve the sealed connection between the bellows 3 and the sealed chamber 1. An annular groove is provided on the wall of the sealed chamber 1, and a sealing ring 7 is installed in the annular groove. The end flange 32 of the bellows 3 is fixed to the sealed chamber 1 and the sealing ring 7 is pressed to achieve the sealed fixed connection between the end flange 32 of the bellows 3 and the sealed chamber 1. A mounting hole is provided on the connection flange 11 of the sealed chamber 1, and a guide sleeve is installed in the mounting hole. A guide ring 5 is provided on the guide sleeve, and the guide sliding of the insulating pull rod 2 is achieved by the cooperation of the guide ring 5 and the guide sleeve. An annular groove is provided on the outer side of the guide ring 5, and a sealing ring 7 is installed in the annular groove. The end flange 32 of the bellows 3 is connected to the connecting flange 11 by screws. When the end flange 32 of the bellows 3 is connected and fixed to the connecting flange 11, the end flange 32 of the bellows 3 presses the sealing ring 7 to achieve sealing. The end flange 32 of the bellows 3 is connected to the sealed chamber 1, so that the bellows 3 and the sealed chamber 1 are detachably connected, which makes it possible to remove the bellows 3 when it is necessary to replace the bellows 3, and the situation where only one of the sealed chamber 1 or the bellows 3 fails will not occur, and the sealed chamber 1 and the bellows 3 will not be replaced together.

[0028] During assembly, first install the sealing ring 7 into the annular groove on the connecting flange 11, and then connect and fix the end flange 32 of the bellows 3 to the connecting flange 11 to press the sealing ring 7. Then install the insulating pull rod 2, and press and fix the head end flange 31 of the bellows 3 through the cooperation of the pressing ring 4 and the stop boss 21. Then, after assembling the guide sleeve and the guide ring 5, install them into the mounting hole on the connecting flange 11, and finally connect the connecting flange 11 to the cylindrical body of the sealing chamber 1 to form a complete sealing chamber 1.

[0029] An embodiment of the insulating rod sealing structure of the present invention: Its specific structure is the same as the specific structure of the insulating rod sealing structure in the circuit breaker described above, and will not be described in detail herein.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the description and drawings of the present invention shall be included in the protection scope of the present invention.

Claims

1. An insulating rod sealing structure, comprising a sealed chamber and an insulating rod slidably mounted on the sealed chamber, a bellows is sleeved on the insulating rod, one end of the bellows is sealedly connected to a head end flange, and the other end of the bellows is sealedly connected to the sealed chamber, characterized in that: The insulating rod is installed in the corrugated tube and passes through the head end flange. A sealing structure is provided between the head end flange and the insulating rod to seal the insulating rod and the head end flange. The insulating rod is also provided with a fixing structure to fix the head end flange and the insulating rod in the axial direction.

2. The insulating rod sealing structure according to claim 1, characterized in that: The insulating pull rod is provided with a stop boss that cooperates with the first end flange of the bellows. The insulating pull rod is also fixed with a pressure ring. The pressure ring cooperates with the stop boss to fix the first end flange of the bellows and the insulating pull rod. The stop boss and the pressure ring together constitute the fixed structure.

3. The insulating rod sealing structure according to claim 2, characterized in that: The insulating pull rod is provided with a threaded section, and the pressure ring is a threaded sleeve. The pressure ring is screwed on the threaded section and cooperates with the stop boss to clamp the head end flange.

4. The insulating rod sealing structure according to any one of claims 1 to 3, characterized in that: The other end of the bellows is sealed with an end flange, which is connected to the sealed chamber by bolts and presses a sealing ring onto the sealed chamber to achieve a sealed connection between the bellows and the sealed chamber.

5. A circuit breaker, comprising an insulating rod sealing structure, the insulating rod sealing structure comprising a sealed chamber and an insulating rod slidably mounted on the sealed chamber, a bellows is sleeved on the insulating rod, one end of the bellows is sealedly connected to a head end flange, and the other end of the bellows is sealedly connected to the sealed chamber, characterized in that: The insulating rod is installed in the corrugated tube and passes through the head end flange. A sealing structure is provided between the head end flange and the insulating rod to seal the insulating rod and the head end flange. The insulating rod is also provided with a fixing structure to fix the head end flange and the insulating rod in the axial direction.

6. The circuit breaker according to claim 5, characterized in that: The insulating pull rod is provided with a stop boss that cooperates with the first end flange of the bellows. The insulating pull rod is also fixed with a pressure ring. The pressure ring cooperates with the stop boss to fix the first end flange of the bellows and the insulating pull rod. The stop boss and the pressure ring together constitute the fixed structure.

7. The circuit breaker according to claim 6, characterized in that: The insulating pull rod is provided with a threaded section, and the pressure ring is a threaded sleeve. The pressure ring is screwed on the threaded section and cooperates with the stop boss to clamp the head end flange.

8. The circuit breaker according to any one of claims 5 to 7, characterized in that: The other end of the bellows is sealed with an end flange, which is connected to the sealed chamber by bolts and presses a sealing ring onto the sealed chamber to achieve a sealed connection between the bellows and the sealed chamber.

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