Single-phase loop, combined switch and gas-insulated switchgear

Abstract

The invention relates to the field of gas insulated switch devices, in particular to a single-phase loop, a combined switch and a gas insulated switchgear. The gas-insulated switchgear comprises a combined switch and a gas chamber, the combined switch comprises a three-phase main loop composed of three single-phase loops, a one-way loop comprises a solid-sealed polar pole, and a grounding contact supporting seat, an isolation contact supporting seat and a switch moving contact supporting seat of an isolation switch are integrally poured on an insulating shell of the solid-sealed polar pole. A grounding contact is installed on the grounding contact supporting seat, an isolation contact is installed on the isolation contact supporting seat, a switch moving contact seat is packaged in the switch moving contact supporting seat, a switch moving contact is installed through the switch moving contact seat, and the grounding contact, the isolation contact and the switch moving contact are coaxial. And the arc extinguish chamber movable conducting rod of the arc extinguish chamber of the solid-sealed polar pole is conductively connected with the switch movable contact seat. According to the gas-insulated switchgear, the coaxiality of the contacts of the combined switch in the gas-insulated switchgear is increased.

Description

Technical Field

[0001] The invention relates to the field of gas-insulated switchgear, in particular to a single-phase circuit, a combined switch and a gas-filled cabinet. Background Art

[0002] The gas-insulated cabinet is a gas-insulated switchgear that places the conductive components of switchgear such as circuit breakers, grounding switches, and disconnectors in a sealed gas chamber filled with sulfur hexafluoride or other insulating gases to ensure the insulation performance of the switchgear. The gas-insulated cabinet has the advantages of small size and insulation performance that is not affected by the surrounding atmospheric conditions, and is widely used in the medium voltage range. Traditional circuit breakers and three-position switches are split-type and need to be fixed to the gas-insulated cabinet separately. The assembly and commissioning of the circuit breaker and the three-position switch must be completed in the narrow cabinet space, which is inconvenient to install and has low assembly efficiency. It is also difficult to ensure the coaxiality of the moving contact and the static contact of the three-position switch, which leads to easy failures and damage to components during operation.

[0003] The Chinese utility model patent with authorization announcement number CN214013686U provides an integrated gas-filled cabinet circuit breaker, which includes a sealed pole, a contact seat fixedly connected to the sealed pole, an isolating contact fixedly connected to the contact seat, and a switch moving contact support seat fixedly connected to the sealed pole. The switch moving contact support seat is encapsulated with a switch moving contact seat, and the switch moving contact is connected through the switch moving contact seat. The isolating contact is coaxial with the switch moving contact. An arc extinguishing chamber moving conductive rod is provided in the arc extinguishing chamber of the sealed pole, and a conductive structure electrically connected to the arc extinguishing chamber moving conductive rod and the switch moving contact is provided in the integrated gas-filled cabinet circuit breaker.

[0004] The device can fix the switch moving contact support seat and the contact seat fixedly connected with the isolating contact of the three-position switch on the solid-sealed pole, so that part of the structure of the three-position switch and the solid-sealed pole can be assembled outside the gas cabinet, and then installed inside the gas cabinet after debugging, which greatly facilitates the installation of the three-position switch and the solid-sealed pole, improves the assembly efficiency, and also improves the coaxiality of the switch moving contact, isolating contact, and grounding contact of the three-position switch, reducing the probability of failure caused by insufficient coaxiality of the switch moving contact, isolating contact, and grounding contact of the three-position switch. However, since the switch moving contact support seat and the contact seat fixedly connected with the isolating contact of the three-position switch of the device still need to be installed on the solid-sealed pole, there are still processing errors and installation errors in the installation operation, and it is difficult to ensure the coaxiality of the contacts of the three-position switch. Summary of the invention

[0005] The object of the present invention is to provide a single-phase circuit to solve the problem in the prior art that the switch moving contact support seat of the single-phase circuit and the contact seat fixedly connected with the isolating contact still need to be installed on the sealed pole, and there are processing errors and installation errors in the installation operation, making it difficult to ensure the coaxiality of the contacts of the three-position switch.

[0006] Another object of the present invention is to provide a combined switch to solve the problem that the switch moving contact support seat of the single-phase circuit in the three-position switch in the prior art and the contact seat fixedly connected with the isolating contact still need to be installed on the sealed pole, resulting in processing errors and installation errors in the installation operation, making it difficult to ensure the coaxiality of the contacts of the three-position switch.

[0007] The purpose of the present invention is also to provide an inflatable cabinet to solve the problem in the prior art that the switch moving contact support seat of the single-phase circuit in the three-position switch in the inflatable cabinet and the contact seat fixedly connected with the isolating contact still need to be installed on the sealed pole, and there are processing errors and installation errors in the installation operation, making it difficult to ensure the coaxiality of the contacts of the three-position switch.

[0008] In order to solve the above problems, the single-phase circuit of the present invention adopts the following technical solutions: The present invention provides a single-phase circuit, which includes a sealed pole, an insulating shell of which is integrally cast with a grounding contact support seat, an isolating contact support seat and a switch moving contact support seat for supporting a moving contact of an isolating switch, a grounding contact is mounted on the grounding contact support seat, an isolating contact is mounted on the isolating contact support seat, a switch moving contact seat is encapsulated in the switch moving contact support seat, and a switch moving contact is mounted through the switch moving contact seat, the grounding contact, the isolating contact and the switch moving contact are coaxial, and a moving conductive rod of an arc extinguishing chamber of the sealed pole is conductively connected to the switch moving contact seat.

[0009] Furthermore, the movable conductive rod of the arc extinguishing chamber is conductively connected to the movable contact seat of the switch via a flexible connection.

[0010] Furthermore, a step surface is provided on the inner wall of the insulating shell of the sealed pole at the switch moving contact support seat, and a circumferential side surface of the switch moving contact seat is exposed from the step surface and connected to the flexible connection.

[0011] Furthermore, a step surface facing the same direction as the step surface of the switch moving contact support seat is provided on one circumferential side of the switch moving contact seat, and the switch moving contact seat is connected to the soft connection through a side surface of its step surface that is perpendicular to the sealed pole, and the other side surface of its step surface is covered by an insulating shell.

[0012] Beneficial effects: The present invention provides an improved single-phase circuit. The single-phase circuit of the present invention installs the switch moving contact support seat and the contact seat fixedly connected with the isolating contact in the existing single-phase circuit on the solid-sealed pole shell, and changes it to casting the switch moving contact support seat, the isolating contact support seat, the grounding contact support seat and the insulating shell of the solid-sealed pole as one piece. Compared with the prior art, the present device reduces the processing error and installation error caused by the installation operation by casting the switch moving contact support seat, the isolating contact support seat, the grounding contact support seat and the insulating shell of the solid-sealed pole as one piece, and increases the coaxiality of the isolating contact, the switch moving contact and the grounding contact in the single-phase circuit.

[0013] The combined switch of the present invention adopts the following technical solutions: The present invention provides a combined switch, which includes a three-phase main circuit composed of three single-phase circuits, the single-phase circuit includes a sealed pole, the combined switch also includes a mounting plate, the sealed pole of the three-phase main circuit is sealed and mounted on the mounting plate, a grounding contact support seat, an isolating contact support seat and a switch moving contact support seat for supporting a moving contact of an isolating switch are integrally cast on the insulating shell of the sealed pole, a grounding contact is mounted on the grounding contact support seat, an isolating contact is mounted on the isolating contact support seat, a switch moving contact seat is encapsulated in the switch moving contact support seat, and a switch moving contact is mounted through the switch moving contact seat, the grounding contact, the isolating contact and the switch moving contact are coaxial, and the arc extinguishing chamber moving conductive rod of the arc extinguishing chamber of the sealed pole is conductively connected to the switch moving contact seat.

[0014] Furthermore, the movable conductive rod of the arc extinguishing chamber is conductively connected to the movable contact seat of the switch via a flexible connection.

[0015] Furthermore, a step surface is provided on the inner wall of the insulating shell of the sealed pole at the switch moving contact support seat, and a circumferential side surface of the switch moving contact seat is exposed from the step surface and connected to the flexible connection.

[0016] Furthermore, a step surface facing the same direction as the step surface of the switch moving contact support seat is provided on one circumferential side of the switch moving contact seat, and the switch moving contact seat is connected to the soft connection through a side surface of its step surface that is perpendicular to the sealed pole, and the other side surface of its step surface is covered by an insulating shell.

[0017] Furthermore, the switch moving contact is provided with an axial threaded hole, and a driving screw is installed in the axial threaded hole.

[0018] Furthermore, the rotary dynamic seal includes a sealing seat, which is sealingly mounted on a mounting plate. A mounting hole is provided in the sealing seat, and a rotating main shaft is installed in the mounting hole through rotating bearings at both ends. The rotating main shaft is coaxially fixedly connected to the insulating screw, and a lip sealing ring is installed between the rotating bearings at both ends of the sealing seat.

[0019] Furthermore, the rotating main shafts of the three-phase main circuit are synchronously connected through a sprocket chain mechanism.

[0020] Furthermore, a leakage current grounding rod is connected between the isolation contact support seats of the three-phase main circuit.

[0021] Beneficial effect: The present invention provides an improved combination switch. The combination switch of the present invention installs the switch moving contact support seat and the contact seat fixedly connected with the isolating contact in the existing three-position switch on the solid-sealed pole shell, and changes it to casting the switch moving contact support seat, the isolating contact support seat, the grounding contact support seat and the insulating shell of the solid-sealed pole as one piece. Compared with the prior art, the present device reduces the processing error and installation error caused by the installation operation by casting the switch moving contact support seat, the isolating contact support seat, the grounding contact support seat and the insulating shell of the solid-sealed pole in the three-phase total circuit of the combination switch as one piece, and increases the coaxiality of the isolating contact, the switch moving contact and the grounding contact in the three-phase total circuit of the combination switch.

[0022] The inflatable cabinet of the present invention adopts the following technical solutions: The present invention provides an inflatable cabinet, which includes an air chamber and a combined switch. The combined switch includes a three-phase main circuit composed of three single-phase circuits, the single-phase circuit includes a sealed pole, and the combined switch also includes a mounting plate. The sealed poles of the three-phase main circuit are sealed and mounted on the mounting plate. A grounding contact support seat, an isolating contact support seat and a switch moving contact support seat for supporting a moving contact of an isolating switch are integrally cast on the insulating shell of the sealed pole. A grounding contact is mounted on the grounding contact support seat, an isolating contact is mounted on the isolating contact support seat, a switch moving contact seat is encapsulated in the switch moving contact support seat, and a switch moving contact is mounted through the switch moving contact seat. The grounding contact, the isolating contact and the switch moving contact are coaxial, and the arc extinguishing chamber moving conductive rod of the arc extinguishing chamber of the sealed pole is conductively connected to the switch moving contact seat.

[0023] Furthermore, the movable conductive rod of the arc extinguishing chamber is conductively connected to the movable contact seat of the switch via a flexible connection.

[0024] Furthermore, a step surface is provided on the inner wall of the insulating shell of the sealed pole at the switch moving contact support seat, and a circumferential side surface of the switch moving contact seat is exposed from the step surface and connected to the flexible connection.

[0025] Furthermore, a step surface facing the same direction as the step surface of the switch moving contact support seat is provided on one circumferential side of the switch moving contact seat, and the switch moving contact seat is connected to the soft connection through a side surface of its step surface that is perpendicular to the sealed pole, and the other side surface of its step surface is covered by an insulating shell.

[0026] Furthermore, the switch moving contact is provided with an axial threaded hole, and a driving screw is installed in the axial threaded hole.

[0027] Furthermore, the rotary dynamic seal includes a sealing seat, which is sealingly mounted on a mounting plate. A mounting hole is provided in the sealing seat, and a rotating main shaft is installed in the mounting hole through rotating bearings at both ends. The rotating main shaft is coaxially fixedly connected to the insulating screw, and a lip sealing ring is installed between the rotating bearings at both ends of the sealing seat.

[0028] Furthermore, the rotating main shafts of the three-phase main circuit are synchronously connected through a sprocket chain mechanism.

[0029] Furthermore, a leakage current grounding rod is connected between the isolation contact support seats of the three-phase main circuit.

[0030] Beneficial effect: The present invention provides an improved inflatable cabinet. The inflatable cabinet of the present invention installs the switch moving contact support seat and the contact seat fixedly connected with the isolating contact in the middle three-position switch of the existing inflatable cabinet on the solid-sealed pole shell, and changes it to casting the switch moving contact support seat, the isolating contact support seat, the grounding contact support seat and the insulating shell of the solid-sealed pole as one piece. Compared with the prior art, the present device reduces the processing error and installation error caused by the installation operation by casting the switch moving contact support seat, the isolating contact support seat, the grounding contact support seat in the three-phase main circuit of the combined switch in the device as one piece with the insulating shell of the solid-sealed pole, and increases the coaxiality of the isolating contact, the switch moving contact and the grounding contact in the three-phase main circuit of the combined switch in the inflatable cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the combined switch of the present invention; Figure 2 It is a structural schematic diagram of the combined switch of the present invention from another angle; Figure 3 It is a cross-sectional view of the rotary seal of the combined switch of the present invention; Figure 4 It is a cross-sectional view of the partial structure of the combined switch of the present invention after removing the circuit breaker operating mechanism and the three-position switch operating mechanism.

[0032] In the figure: 1. Sealed pole; 111. Insulating screw; 112. Switch moving contact; 113. Grounding contact; 114. Circuit breaker outlet terminal; 116. Arc extinguishing chamber moving conductive rod; 2. Mounting plate; 3. Circuit breaker operating mechanism mounting plate; 4. Circuit breaker operating mechanism; 5. Three-position switch operating mechanism; 6. Rotary dynamic seal; 61. Seal seat; 62. Rotating main shaft; 63. Rotating bearing; 64. Lip seal; 7. Grounding terminal; 8. Switch moving contact support seat; 9. Leakage current grounding rod; 10. Grounding copper busbar; 11. Isolating contact; 12. Arc extinguishing chamber; 13. Soft connection; 14. Switch moving contact seat; 15. Sprocket chain structure. DETAILED DESCRIPTION

[0033] The features and performance of the present invention are further described below in conjunction with the embodiments.

[0034] First, the inventive concept of the single-phase circuit of the present invention is introduced, that is, by installing the moving contact support seat and the contact seat fixedly connected with the isolating contact in the existing single-phase circuit on the solid-sealed pole shell, the switch moving contact support seat, the isolating contact support seat, the grounding contact support seat and the insulating shell of the solid-sealed pole are cast as one piece, thereby reducing the processing error and installation error caused by the installation operation and increasing the coaxiality of the isolating contact, the switch moving contact and the grounding contact in the single-phase circuit.

[0035] Based on the above invention concept, Figure 4 As shown, the single-phase circuit of the present invention includes a sealed pole 1, which includes an arc extinguishing chamber 12. An arc extinguishing chamber moving conductive rod 16 is installed at one end of the arc extinguishing chamber 12, and a circuit breaker static contact is installed at the other end. The circuit breaker static contact is connected to the circuit breaker output terminal 114. The arc extinguishing chamber moving conductive rod 16 can be guided and moved in the sealed pole 1 to close or disconnect the circuit breaker moving contact and the circuit breaker static contact.

[0036] A grounding contact support seat, an isolating contact support seat, and a switch moving contact support seat 8 are integrally cast on the insulating shell of the sealed pole 1. A grounding contact 113 is installed on the grounding contact support seat, and an isolating contact 11 is installed on the isolating contact support seat. A switch moving contact seat 14 is encapsulated in the switch moving contact support seat 8, and a switch moving contact 112 is installed through the switch moving contact seat 14. The grounding contact 113, the isolating contact 11, and the switch moving contact 112 are coaxial. The arc extinguishing chamber moving conductive rod 116 of the arc extinguishing chamber 12 of the sealed pole 1 is conductively connected to the switch moving contact seat 14, and the switch moving contact 112 can be guided and moved on the switch moving contact seat 14 to switch the closing position, the isolation position, and the grounding position. When the switch moving contact 112 is only in contact with the switch moving contact seat 14, it is the isolation position; when the switch moving contact 112 is connected between the switch moving contact seat 14 and the isolation contact 11, it is the closing position; when the switch moving contact 112 is connected between the switch moving contact seat 14 and the grounding contact 113, it is the grounding position.

[0037] Based on the above main concepts, different embodiments are provided below for illustration.

[0038] In Example 1, by Figure 4 As shown, this embodiment is mainly a specific introduction to the conductive structure of the switch. In one embodiment, there is a plug under the moving contact seat of the switch, a copper column is installed in the insulating shell of the sealed pole, the upper end of the copper column has a flange, and the insulating shell of the sealed pole is provided with a stop groove corresponding to the flange. The copper column is fixedly installed in the insulating shell through the flange, and the upper end of the copper column is provided with a socket matching the plug. The plug is inserted into the socket, and the lower end of the copper column is connected to a flexible connection for conduction, and the other end of the flexible connection is connected to the moving conductive rod of the arc extinguishing chamber.

[0039] In another embodiment, Figure 4 As shown, the switch moving contact seat 14 is directly conductively connected to the moving conductive rod 16 of the arc extinguishing chamber through a flexible connection. A step surface is provided on the inner wall of the insulating shell of the sealed pole 1 at the switch moving contact support seat 8. One circumferential side surface of the switch moving contact 112 is exposed from the step surface and connected to the flexible connection 13. The other end of the flexible connection 13 is connected to the moving conductive rod 16 of the arc extinguishing chamber.

[0040] In a better embodiment, a step surface facing the same direction as the step surface of the switch moving contact support seat 8 is provided on one circumferential side of the switch moving contact seat 14, and the switch moving contact seat 14 is connected to the flexible connection through a side of its step surface perpendicular to the sealed pole 1, and the other side of its step surface is covered by an insulating shell. This will make the single-phase circuit have a more compact structure and a smaller size.

[0041] With the help of Figure 1-Figure 4 As shown, the present invention also provides a combined switch, which includes a three-phase main circuit composed of three single-phase circuits in the above-mentioned embodiments, and the combined switch also includes a mounting plate 2, and the sealed pole 1 of the three-phase main circuit is sealed and mounted on one side of the mounting plate 2, and the other side of the mounting plate 2 is connected to a circuit breaker operating mechanism mounting plate 3, and a circuit breaker operating mechanism 4 is mounted on the circuit breaker operating mechanism mounting plate 3. The combined switch controls the moving conductive rod 16 of the arc extinguishing chamber to guide and move in the sealed pole 1 through the circuit breaker operating mechanism 4, and the moving conductive rod 16 of the arc extinguishing chamber is guided and moved in the sealed pole 1 through the guided movement of the moving conductive rod 16 of the arc extinguishing chamber in the sealed pole 1 so as to connect or disconnect the circuit breaker static contact and the moving contact of the circuit breaker to control the circuit on and off, and a three-position switch operating mechanism 5 is also installed on the other side of the mounting plate 2 to control the moving contact 112 of the switch to guide and move on the moving contact support seat 8, and the switching of the three positions is realized by the movement of the moving contact 112.

[0042] In Example 2, by Figure 1-Figure 4As shown, this embodiment is a specific introduction to the switch moving contact. In one embodiment, the switch moving contact is a solid cylinder, a dovetail guide groove is provided below the switch moving contact, a conductive guide rail matching the dovetail guide groove is provided on the switch moving contact seat, and the three-position switch operating mechanism includes an insulating rod, the insulating rod is threadedly connected to the switch moving contact, and a guide groove having the same shape and coaxial with the guide groove on the switch moving contact is provided below the insulating rod. The three-position switch operating mechanism can control the insulating rod to guide and move on the guide rail, and control the switch moving contact to guide and move on the switch moving contact seat through the insulating rod. In another embodiment, a guide hole is provided on the switch moving contact seat 16, the switch moving contact 112 is a cylinder matching the shape of the guide hole, and the inner hole of the cylinder is an axial screw hole. The three-position switch operating mechanism 5 includes an insulating screw 111, and the three-position switch operating mechanism 5 can control the insulating screw 111 to rotate around its own axis, and the axial screw hole of the cylinder is threadedly matched with the insulating screw 111 to guide and move back and forth in the axial direction of the insulating screw 111.

[0043] Based on the above concepts and embodiments, Figure 3 As shown, the three-position switch operating mechanism includes a rotary dynamic seal 6, which includes a sealing seat 61. The sealing seat 61 is sealingly mounted on the mounting plate 2. A mounting hole is provided in the sealing seat 61. A rotating main shaft 62 is installed in the mounting hole through two disconnected rotating bearings. The rotating main shaft 62 is coaxially fixedly connected with the insulating screw 111. Three lip sealing rings 64 are installed between the rotating bearings 63 at both ends of the sealing seat 61.

[0044] In one embodiment, Figure 1 , Figure 4 As shown, in order to synchronize the movement of the switch moving contact 112 of the three-phase main circuit, a sprocket 15 is connected to the rotating main shaft 62 of the three-phase main circuit, and a chain is connected between the sprockets. The rotating main shaft 62 of the three-phase main circuit is synchronously driven by the sprocket chain mechanism 15.

[0045] Based on the above concepts and embodiments, a leakage current grounding rod 9 is connected between the isolation contact support seats of the three-phase main circuit, and a grounding copper bus 10 is connected between the grounding contacts 113 of the three-phase main circuit, and a grounding terminal 7 is fixedly connected to the grounding copper bus 10.

[0046] The present invention further provides an inflatable cabinet, which includes an air chamber and a combined switch, and the combined switch is the combined switch in the above embodiment.

[0047] 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 contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A single-phase circuit, characterized in that: It comprises a sealed pole, on the insulating shell of which a grounding contact support seat, an isolating contact support seat and a switch moving contact support seat for supporting the moving contact of the isolating switch are integrally cast, the grounding contact support seat is provided with a grounding contact, the isolating contact support seat is provided with an isolating contact, the switch moving contact support seat is encapsulated with a switch moving contact seat, and the switch moving contact is installed through the switch moving contact seat, the grounding contact, the isolating contact and the switch moving contact are coaxial, and the arc extinguishing chamber moving conductive rod of the arc extinguishing chamber of the sealed pole is conductively connected to the switch moving contact seat.

2. The single-phase circuit according to claim 1 is characterized in that: The movable conductive rod of the arc extinguishing chamber is conductively connected to the movable contact seat of the switch via a flexible connection.

3. The single-phase circuit according to claim 2 is characterized in that A step surface is provided on the inner wall of the insulating shell of the sealed pole at the switch moving contact support seat, and a circumferential side surface of the switch moving contact seat is exposed from the step surface and connected to the flexible connection.

4. The single-phase circuit according to claim 3 is characterized in that: A step surface facing the same direction as the step surface of the switch moving contact support seat is provided on one circumferential side of the switch moving contact seat. The switch moving contact seat is connected to the flexible connection through a side surface of the step surface that is perpendicular to the sealed pole, and the other side surface of the step surface is covered by the insulating shell.

5. A combined switch, characterized in that: It comprises a three-phase main circuit composed of three single-phase circuits as described in any one of claims 1 to 4, and the combined switch further comprises a mounting plate, and the sealed poles of the three-phase main circuit are sealed and mounted on the mounting plate.

6. The combined switch according to claim 5, characterized in that: The switch moving contact is provided with an axial threaded hole, and a driving screw is installed in the axial threaded hole.

7. The combined switch according to claim 6, characterized in that: The combined switch includes a rotary dynamic seal, which includes a sealing seat. The sealing seat is sealingly mounted on a mounting plate. A mounting hole is provided in the sealing seat. A rotating main shaft is mounted in the mounting hole through rotating bearings at both ends. The rotating main shaft is coaxially fixedly connected to a driving screw. A lip sealing ring is installed between the rotating bearings at both ends of the sealing seat.

8. The combined switch according to claim 7, characterized in that: The rotating main shafts of the three-phase main circuit are synchronously connected through a sprocket chain mechanism.

9. The combined switch according to any one of claims 5 to 8, characterized in that: A leakage current grounding rod is connected between the isolation contact support seats of the three-phase main circuit.

10. An inflatable cabinet, comprising an air chamber and a combined switch, characterized in that: The combined switch is the combined switch described in any one of claims 5 to 9.

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