Circuit breaker static end support and circuit breaker

Abstract

The invention relates to the field of parts of a high-voltage switch with an arc extinguishing device, in particular to a circuit breaker static end support and a circuit breaker. The circuit breaker comprises a static end assembly, the static end assembly comprises a static end support, a static arc contact and a static main contact, the static end support is of an integrally-formed structure and comprises a main cylinder, the static main contact is fixedly installed at one end of the main cylinder, and a static arc contact installation structure is arranged in the main cylinder. The static arc contact mounting structure comprises fixed support arms extending inwards from the inner wall of the main cylinder, the inner ends of the fixed support arms are connected in the center of the main cylinder to form a middle fixed platform, and an arc contact mounting hole coaxial with the main cylinder is formed in the middle fixed platform and used for mounting a static arc contact. And an axial airflow channel is formed by a gap between every two adjacent fixed support arms. The static arc contact is directly installed on the static end support, the number of middle fixed connection points is reduced, and therefore the influence of looseness or deformation of the middle fixed connection points on the centering performance of the static arc contact is reduced.

Description

Technical Field

[0001] The invention relates to the field of components of high-voltage switches with arc extinguishing devices, and in particular to a circuit breaker static end support and a circuit breaker. Background Art

[0002] A circuit breaker is an electrical device used to connect or disconnect a circuit. The static end structure inside the circuit breaker is a key component of the circuit breaker. The static arc contact, as the core component in the static end structure, first contacts the moving arc contact when the circuit breaker is closed, and separates from the moving arc contact when the circuit breaker is opened.

[0003] At present, the static end support of the circuit breaker is Figure 3 As shown, it includes an end shielding member 21, a static end support shielding member 22, and a contact seat 23. The static end support shielding member 22 adopts an integrated casting structure, which is a cylindrical structure with two ends open. The inner wall of the cylinder 29 extends inward to form an annular boss 25. The annular boss 25 is provided with a mounting hole for mounting the contact seat 23 and the static main contact finger 16. The contact seat 23 is provided with a mounting hole for mounting the static arc contact 24, and the mounting hole is coaxially arranged with the cylinder 29. A static end support shielding cover 26 is integrally formed at one end of the cylinder 29. Figure 3 The view is the main view, and the static end support shielding cover 26 is arranged in a "C" shape in the main view. From the right view, the static end support shielding cover 26 is a circular structure, and its center is offset from the central axis of the static end support shielding member 22. The static end support shielding cover 26 is provided with a mounting hole for the finger shield 17 at the starting position when it is integrally formed on the static end support shielding member 22, and the other end of the cylinder 29 has an outward boss 27, and the boss 27 is provided with a mounting hole for mounting the end shielding member 21.

[0004] The end shielding component 21 is also a cylindrical structure with openings at both ends, one end of which has an outwardly curled pressure-equalizing skirt 141 for uniform electric field, and the other end has an outwardly folded flange structure 28, on which mounting holes are provided. During installation, the mounting holes on the boss 27 of the static end support shielding component 22 are installed correspondingly to the mounting holes on the flange structure 28 of the end shielding component 21.

[0005] In the above structure, the static arc contact is first fixed to the contact seat during installation, and then the contact seat with the static arc contact is fixed to the corresponding position of the static end support shield. This multi-component connection means that more fasteners are required, and each fastener connection point may become a potential source of failure. For example, when the circuit breaker is closed, the static arc contact will be subjected to the impact force of the moving arc contact when the moving arc contact contacts the static arc contact. After multiple closing actions, the fixed connection points between the static arc contact and the contact seat and between the contact seat and the static end support shield will become loose under the action of multiple impact forces; for another example, when the circuit breaker is opened and closed, an arc will be generated between the moving and static arc contacts, and the high temperature generated by the arc will be transmitted to the fixed connection points between the static arc contact and the contact seat and between the contact seat and the static end support shield, and the fixed connection points will expand and deform due to heat. The looseness or deformation at the fixed connection point will affect the alignment of the static arc contact with the moving arc contact when the circuit breaker is closed. Summary of the invention

[0006] The object of the present invention is to provide a static end support for a circuit breaker, so as to solve the problem that the static arc contact in the existing circuit breaker needs to be connected to the static end support shield through an intermediate component, namely a contact seat, and the fixed connection point when the contact seat is installed on the static end support shield becomes loose or deformed after the circuit breaker operates for a long time, thereby affecting the neutrality of the static arc contact.

[0007] The present invention also aims to provide a circuit breaker to solve the problem that the static arc contact in the existing circuit breaker needs to be connected to the static end support shield through an intermediate component, namely, a contact seat, and the fixed connection point when the contact seat is installed on the static end support shield becomes loose or deformed after the circuit breaker operates for a long time, thereby affecting the neutrality of the static arc contact.

[0008] In order to achieve the above-mentioned purpose, the circuit breaker static end support of the present invention adopts the following technical solutions: A circuit breaker static end support is an integrally formed structure, comprising a main cylinder with openings at both ends, a static arc contact mounting structure inside the main cylinder, the static arc contact mounting structure comprising a group of fixed arms extending inward from the inner wall of the main cylinder, the inner ends of the fixed arms are connected at the center of the main cylinder to form a middle fixed platform, and the middle fixed platform is provided with an arc contact mounting hole coaxial with the main cylinder.

[0009] Furthermore, the fixed support arm extends obliquely.

[0010] Furthermore, the inclination direction of the fixed support arm is from outside to inside along the radial direction of the main cylinder, and the fixed support arm is inclined toward the side of the main cylinder where the main contact mounting structure is located.

[0011] Furthermore, the main cylinder is a conical cylinder with a smaller diameter at one end where the main contact mounting structure is located and a larger diameter at the other end.

[0012] Furthermore, the main cylinder is integrally formed with an outwardly curled pressure-equalizing skirt at one end away from the main contact mounting structure.

[0013] Beneficial effects: The circuit breaker static end support of the present invention is a pioneering invention. Specifically, it includes a static end support, the main cylinder of the static end support is integrally formed with a static arc contact mounting structure for mounting a static arc contact, and the static arc contact is directly connected and mounted with the static end support, which avoids the connection point between the contact seat and the static end support shield being loosened under the impact force of the moving arc contact when the circuit breaker is closed, which affects the neutrality of the static arc contact and the moving arc contact when closing the circuit breaker, and also avoids the high temperature generated by the arc between the moving and static arc contacts when the circuit breaker is opened and closed. The high temperature is transmitted to the fixed connection point between the contact seat and the static end support shield, causing the fixed connection point to expand due to heat and deform, which affects the neutrality of the static arc contact and the moving arc contact when closing the circuit breaker.

[0014] To achieve the above object, the circuit breaker of the present invention adopts the following technical solution: A circuit breaker comprises a static end assembly, wherein the static end assembly comprises a circuit breaker static end support and a static arc contact and a static main contact mounted on the circuit breaker static end support, wherein the circuit breaker static end support is an integrally formed structure, comprising a main cylinder with openings at both ends, wherein the static main contact is fixedly mounted at a main contact mounting structure at one end of the main cylinder, wherein the main cylinder is provided with a static arc contact mounting structure, wherein the static arc contact mounting structure comprises a group of fixed arms extending inwardly from an inner wall of the main cylinder, wherein the inner ends of the fixed arms meet at a central position of the main cylinder and form a middle fixed platform, wherein an arc contact mounting hole coaxial with the main cylinder is provided on the middle fixed platform, and wherein the static arc contact is fixedly mounted at the arc contact mounting hole.

[0015] Furthermore, the fixed support arm extends obliquely.

[0016] Furthermore, the inclination direction of the fixed support arm is from outside to inside along the radial direction of the main cylinder, and the fixed support arm is inclined toward the side of the main cylinder where the main contact mounting structure is located.

[0017] Furthermore, the main cylinder is a conical cylinder with a smaller diameter at one end where the main contact mounting structure is located and a larger diameter at the other end.

[0018] Furthermore, the main cylinder is integrally formed with an outwardly curled pressure-equalizing skirt at one end away from the main contact mounting structure.

[0019] Beneficial effects: The circuit breaker of the present invention is a pioneering invention. Specifically, it includes a static end assembly, which includes a circuit breaker static end support and a static arc contact and a static main contact installed on the circuit breaker static end support, and the static main contact is fixedly installed at the main contact mounting structure at one end of the main cylinder. The main cylinder of the static end support is integrally formed with a static arc contact mounting structure for mounting the static arc contact, and the static arc contact is directly connected and installed with the static end support, which avoids the connection point between the contact seat and the static end support shield from loosening under the impact force of the moving arc contact when the circuit breaker is closed, which affects the neutrality of the static arc contact and the moving arc contact when closing. At the same time, it also avoids the high temperature generated by the arc between the moving and static arc contacts when the circuit breaker is opened and closed. The high temperature is transmitted to the fixed connection point between the contact seat and the static end support shield, causing the fixed connection point to expand and deform due to heat, which affects the neutrality of the static arc contact and the moving arc contact when closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an assembly diagram of the static end structure of the high voltage circuit breaker of the present invention; Figure 2 for Figure 1 Structural diagram of the middle static end support; Figure 3 This is the static end assembly diagram of the circuit breaker in the prior art.

[0021] In the figure: 1. static end support; 2. main cylinder; 3. static arc contact mounting structure; 4. middle fixed platform; 5. fixed support arm; 6. air flow channel; 7. static arc contact mounting hole; 8. annular boss; 9. nut; 10. disc spring; 11. closing resistor; 12. outgoing conductor; 13. fracture shielding end; 14. End shielding terminal; 141. Voltage-equalizing skirt; 15. Closing resistor mounting seat; 151. Closing resistor mounting threaded hole; 16. Static end main contact finger; 17. Contact finger shielding; 18. Outgoing conductor mounting threaded hole; 19. Static main contact finger mounting threaded hole; 20. Contact finger shielding mounting threaded hole; 21. End shielding member; 22. Static end support shielding member; 23. Contact seat; 24. Static arc contact; 25. Annular boss; 26. Static end support shielding cover; 27. Boss; 28. Flanged structure; 29. ​​Cylinder; 30. Static end support shielding cover. DETAILED DESCRIPTION

[0022] The circuit breaker static end support of the present invention integrates the contact seat and the static end support shield in the prior art into an integrated structure, removes the contact seat in the prior art, and thus also removes the fixed connection point when installing the contact seat. In the present invention, the static arc contact is directly installed on the structure of the contact seat and the static end support shield, reducing the number of intermediate fixed connection points, and reducing the influence of looseness and deformation of the intermediate fixed connection points on the neutrality of the static arc contact and the moving arc contact.

[0023] Based on the above concept, as a basic embodiment, the static end support of the circuit breaker of the present invention is an integrally formed structure, such as Figure 2 As shown, it includes a main cylinder body 2 with openings at both ends, and a static arc contact mounting structure 3 is provided in the main cylinder body 2. The static arc contact mounting structure 3 includes a group of fixed arms 5 extending inward from the inner wall of the main cylinder body 2, and the inner ends of the fixed arms 5 are connected at the center position of the main cylinder body 2 to form a middle fixed platform 4. The middle fixed platform 4 is provided with an arc contact mounting hole 7 coaxial with the main cylinder body 2, and the intervals between adjacent fixed arms 5 form an axial airflow channel 6.

[0024] The static end support 1 is preferably formed by casting, which can make the structure of the static end support 1 more continuous and have better overall strength. In other embodiments, the static end support 1 can also be welded to obtain an integrated structure, or made by subtractive machining.

[0025] In order to facilitate demoulding of the middle fixed platform 4 during casting, the middle fixed platform 4 is preferably a regular cylindrical structure. In other embodiments, the middle fixed platform 4 may also be a prismatic structure or other irregular block structures. An internal thread is machined in the static arc contact mounting hole 7 of the middle fixed platform 4. By controlling the position tolerance of the threaded hole and the end face during machining, the influence of the static arc contact 24 on the neutrality due to the installation position error when the static arc contact 24 is installed in the threaded hole is reduced. The static arc contact 24 is a cylindrical rod structure, one end of which is a mounting end mounted at a corresponding position of the middle fixed platform 5. The corresponding mounting end is provided with an external thread and an annular boss 8. The external thread is arranged between the end face of the static arc contact mounting end and the annular boss 8. The length of the external thread should ensure that the static arc contact 24 can extend a certain distance from one end of the middle fixed platform 4 after threaded matching installation. When installing the static arc contact 24, the external thread at the installation end of the static arc contact 24 is threadedly matched with the internal thread on the middle fixed platform 4. When the annular boss 8 contacts the end face of one end of the middle fixed platform 4, the static arc contact has been installed to the set position. After the static arc contact 24 is installed, the part extending out of the middle fixed platform 4 is installed with the nut 9 and the disc spring 10 to prevent the static arc contact 24 from loosening.

[0026] The fixed arm 5 can be vertically arranged between the inner wall of the main cylinder 2 and the middle fixed platform 4, or can be obliquely arranged between the inner wall of the main cylinder 2 and the middle fixed platform 4. In order to facilitate the demoulding of the fixed arm 5 arranged along the circumferential direction of the inner wall of the main cylinder 2 during the casting process, preferably, the fixed arm 5 is obliquely arranged between the inner wall of the main cylinder 2 of the static end support 1 and the middle fixed platform 4, and the fixed arm 5 is inclined from outside to inside along the radial direction of the main cylinder 2. Because the force direction of the static arc contact 24 when closing is opposite to the main contact mounting structure, in order to make the fixed arm 5 have better force bearing capacity, preferably, the fixed arm 5 is inclined toward the side where the main contact mounting structure of the main cylinder 2 is located. The fixed support arm 5 can be a cylindrical rod-like structure or a plate-like structure with a certain thickness, arranged along the circumference of the main cylinder body. The fixed support arm 5 arranged along the circumference is provided with an airflow channel 6 for arc-extinguishing airflow to pass through. Multiple groups of fixed support arms 5 can be arranged along the circumference of the main cylinder body, and the intervals between two adjacent groups together constitute the airflow channel 6 for gas to pass through.

[0027] One end of the main cylinder 2 of the static end support 1 is a broken shielding end 13, where the main contact mounting structure is located, and the other end is an end shielding end 14. Both ends are provided with an outward flange structure, which is used to uniform the electric field and reduce the occurrence of electric field concentration and discharge. The flange of the end shielding end 14 is an outward curled pressure-equalizing skirt 141 integrally formed with the main cylinder 2 of the static end support 1, which is uniform in size and equidistant from the central axis of the static end support 1.

[0028] The end where the port shielding end 13 is located has a static end support shielding cover 30 integrally formed with the main cylinder 2 of the static end support 1. The structure of the static end support shielding cover 30 is similar to that of the static end support shielding cover 30. Figure 3 The static end support shielding cover 26 in the prior art is the same. The static end support shielding cover 26 is integrally formed on the main cylinder 2 of the static end support 1. The starting position of the static main contact finger mounting threaded hole 19 and the contact finger shield mounting threaded hole 20 for mounting the static end main contact finger 16 and the contact finger shield 17 is used, and the contact finger shield mounting threaded hole 20 is located outside the static main contact finger mounting threaded hole 19.

[0029] like Figure 1 As shown, an outgoing conductor mounting threaded hole 18 for mounting the outgoing conductor 10 is provided on the end of the static end support shielding cover 30 which is farther from the central axis of the static end support main cylinder 2, and a closing resistor mounting seat 15 for mounting the closing resistor 11 is integrally formed on the outer wall of the static end support main cylinder 2 of the static end support shielding cover 30 which is farther from the central axis of the static end support main cylinder 2, and a closing resistor mounting seat 15 for mounting the closing resistor 11 is provided on the closing resistor mounting seat 15, and a closing resistor mounting threaded hole 151 for fixedly connecting with the closing resistor 11 is provided.

[0030] The static end support 1 can be a straight cylinder structure or a conical cylinder structure. When the moving and static arc contacts of the circuit breaker are in contact or separated, an arc will be generated. After the arc is extinguished by the arc extinguishing gas in the circuit breaker, an arc extinguishing airflow will be generated. The arc extinguishing airflow will be discharged into the circuit breaker housing along the cylinder of the static end support 1 in the opposite direction of the main contact installation structure through the airflow channel 6. The circuit breaker housing is in a grounded state, that is, zero potential; while the circuit components in the circuit breaker housing are in a high voltage state, that is, high potential. After the circuit breaker is opened and closed many times, charged metal particles will be generated, and the charged metal particles will be discharged from the cylinder of the static end support 1 with the airflow. If the main cylinder 2 of the static end support 1 is a straight cylinder structure, the airflow with charged metal particles flows out in strands along the cylinder inside the straight cylinder and the flow rate is relatively fast. At this time, more charged metal particles will rush toward the circuit breaker housing in one direction. When the charged metal particles rushing toward the circuit breaker housing are close to the circuit breaker housing, the insulating gas between the charged metal particles and the housing will be broken down, thereby causing the circuit breaker housing to discharge. Therefore, in order to weaken the airflow speed and disperse the flow direction of the airflow, preferably, the main cylinder 2 of the static end support 1 is a conical cylinder, the diameter of the conical cylinder is smaller at one end where the main contact mounting structure is located, and the diameter is larger at the other end, forming a trumpet shape. When the airflow with metal particles flows in the main cylinder 2 of the static end support 1, the diameter of the cylinder gradually increases in the direction of the airflow, so the airflow velocity will be relatively reduced, and when the airflow flows to the end with the largest diameter of the conical cylinder, the airflow is dispersed to different directions.

[0031] The present invention also provides a circuit breaker, the circuit breaker of the present invention comprises a static end assembly, the static end assembly comprises a static end support 1 and a static arc contact 24 and a static main contact mounted on the static end support, the static end support 1 is an integrally formed structure, comprising a main cylinder 2 with openings at both ends, the static main contact is fixedly mounted at the main contact mounting structure at one end of the main cylinder 2, the main cylinder has a static arc contact mounting structure 3, the static arc contact mounting structure 3 comprises a group of fixed arms 5 extending inward from the inner wall of the main cylinder 2, the inner ends of the fixed arms 5 are connected at the center of the main cylinder to form a middle fixed platform 4, the middle fixed platform 4 is provided with an arc contact mounting hole 7 coaxial with the main cylinder 2, the static arc contact 24 is fixedly mounted at the arc contact mounting hole 7, and the interval between adjacent fixed arms 5 forms an axial airflow channel. Other technical solutions of the static end support 1 have been described above and will not be repeated here.

[0032] 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 circuit breaker static end support, characterized in that: It is an integrally formed structure, including a main cylinder body with openings at both ends, and a static arc contact mounting structure inside the main cylinder body. The static arc contact mounting structure includes a group of fixed arms extending inward from the inner wall of the main cylinder body, and the inner ends of the fixed arms are connected at the center of the main cylinder body to form a middle fixed platform, and the middle fixed platform is provided with an arc contact mounting hole coaxial with the main cylinder body.

2. The circuit breaker static end support according to claim 1, characterized in that: The fixed support arm extends obliquely.

3. The circuit breaker static end support according to claim 2, characterized in that: The inclination direction of the fixed support arm is from outside to inside along the radial direction of the main cylinder, and the fixed support arm is inclined toward the side of the main cylinder where the main contact mounting structure is located.

4. The circuit breaker static end support according to any one of claims 1 to 3, characterized in that: The main cylinder is a conical cylinder with a smaller diameter at one end where the main contact mounting structure is located and a larger diameter at the other end.

5. The circuit breaker static end support according to claim 4, characterized in that: The main cylinder is integrally formed with an outwardly curled pressure-equalizing skirt at one end away from the main contact mounting structure.

6. A circuit breaker, comprising a static end assembly, wherein the static end assembly comprises a circuit breaker static end support and a static arc contact and a static main contact mounted on the circuit breaker static end support, characterized in that: The static end support of the circuit breaker is an integrally formed structure, including a main cylinder with openings at both ends. The static main contact is fixedly installed at the main contact mounting structure at one end of the main cylinder. The main cylinder is provided with a static arc contact mounting structure. The static arc contact mounting structure includes a group of fixed arms extending inward from the inner wall of the main cylinder. The inner ends of the fixed arms are connected at the center of the main cylinder to form a middle fixed platform. The middle fixed platform is provided with an arc contact mounting hole coaxial with the main cylinder. The static arc contact is fixedly installed at the arc contact mounting hole.

7. The circuit breaker according to claim 6, characterized in that: The fixed support arm extends obliquely.

8. The circuit breaker according to claim 7, characterized in that: The inclination direction of the fixed support arm is from outside to inside along the radial direction of the main cylinder, and the fixed support arm is inclined toward the side of the main cylinder where the main contact mounting structure is located.

9. The circuit breaker according to any one of claims 6 to 8, characterized in that: The main cylinder is a conical cylinder with a smaller diameter at one end where the main contact mounting structure is located and a larger diameter at the other end.

10. The circuit breaker according to claim 9, characterized in that The main cylinder is integrally formed with an outwardly curled pressure-equalizing skirt at one end away from the main contact mounting structure.

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