Moving arc contact, arc extinguish chamber and circuit breaker

Abstract

The utility model belongs to the technical field of electric switch contacts, and particularly provides a moving arc contact, an arc extinguish chamber and a circuit breaker. The moving arc contact comprises a contact body, the periphery of the contact body is sleeved with an outer diversion sleeve, and a welding seam for fixedly connecting the outer diversion sleeve and the contact body is arranged between the outer diversion sleeve and the contact body. The arc extinguish chamber comprises the moving arc contact. The circuit breaker comprises the moving arc contact. During production, the outer flow guide sleeve and the contact body are reliably connected in a welding mode, and compared with the prior art, metal particles are not prone to appearing or existing in welding seams in the welding process or after welding, so that the problems of insulation failure and the like caused by release of the metal particles during later use are solved. In addition, the welding seam does not affect the conductive through-flow, thereby ensuring that the moving arc contact still has reliable through-flow capability.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric switch contacts, in particular to a moving arc contact, an arc extinguishing chamber and a circuit breaker. Background Art

[0002] Gas insulated switchgear includes electrical components such as circuit breakers, disconnectors, earthing switches, current transformers, voltage transformers, and cylinders. The contacts of the circuit breaker include main contacts and arc contacts, and the arc contacts are further divided into moving arc contacts and static arc contacts. In the prior art, in order to guide the high-pressure airflow to extinguish the arc and support and protect the contact fingers, an outer guide sleeve is generally provided on the outer periphery of the contact body of the moving arc contact, and an inner guide sleeve is provided on the inner wall of the contact body, such as the moving arc contact disclosed in the Chinese utility model patent with authorization announcement number CN217444323U (publication date: 2022.09.16).

[0003] When producing and assembling moving arc contacts, the outer guide sleeve is generally connected to the contact body by screw connection or thread connection. The screw connection method is as follows: Figure 1 As shown, the contact body 1 is provided with a threaded hole, and the outer guide sleeve 2 is provided with a through hole for the screw 3 to pass through. The screw 3 passes through the through hole and is threadedly connected to the contact body 1, thereby fixing the outer guide sleeve 2 on the contact body 1. This method is adopted in the patent with the authorization announcement number CN217444323U. The threaded connection method is as follows Figure 2 As shown, the contact body 1 is provided with an external thread, the outer guide sleeve 2 is provided with an internal thread, and the contact body 1 and the outer guide sleeve 2 are directly threadedly connected.

[0004] The two commonly used methods mentioned above involve processes such as drilling threaded holes during the production and assembly process, which is prone to generate metal debris. During assembly, metal debris is also easily generated in the process of threads engaging with each other. Moreover, this metal debris is easily hidden between the outer guide sleeve and the contact body, making it difficult to observe and clean. However, during subsequent use, it may escape from between the outer guide sleeve and the contact body, causing the circuit breaker to be broken down under energized or disconnected conditions, affecting the insulation level. In addition, in order to improve the reliability of the connection between the outer guide sleeve and the contact body, it is generally necessary to apply anti-loosening glue (insulation) to the screws or threads, but this will also affect the overall current-carrying capacity of the moving arc contact. Utility Model Content

[0005] The purpose of the utility model is to provide a moving arc contact to solve the technical problem that the moving arc contact in the prior art that uses threads or screws to connect the outer guide sleeve and the contact body is prone to generate metal debris, thereby affecting the insulation level of the circuit breaker. The purpose of the utility model is also to provide an arc extinguishing chamber to solve the same technical problem. The purpose of the utility model is also to provide a circuit breaker to solve the same technical problem.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the moving arc contact provided by the utility model is:

[0007] A moving arc contact comprises a contact body. An outer guide sleeve is provided on the outer periphery of the contact body. A first weld for fixing the outer guide sleeve and the contact body is provided between the outer guide sleeve and the contact body.

[0008] As a further improvement, a positioning boss is provided on the outer periphery of the contact body, one end of the positioning boss contacts one end of the outer guide sleeve, and the first weld is provided between the positioning boss and the outer guide sleeve.

[0009] As a further improvement, the outer periphery of the positioning boss and the outer guide sleeve are provided with an inwardly concave section relative to the outer periphery, and the inwardly concave sections of the two are arranged at one end where the positioning boss and the outer guide sleeve are close to each other, and the first weld is arranged on the inwardly concave sections of the positioning boss and the outer guide sleeve.

[0010] As a further improvement, the first weld is not higher than the positioning boss and the outer circumferential surface of the outer guide sleeve.

[0011] As a further improvement, the inward section of the positioning boss and the inward section of the outer guide sleeve are equal in length.

[0012] As a further improvement, the moving arc contact further comprises an inner guide sleeve arranged inside the contact body, and a second weld for fixedly connecting the inner guide sleeve and the contact body is provided between the inner guide sleeve and the contact body.

[0013] As a further improvement, a mounting boss is provided on the outer periphery of the end of the inner guide sleeve, a mounting groove is provided on the inner wall of the contact body, the height dimension of the mounting boss is smaller than the depth dimension of the mounting groove, and the second weld is located between the end face of the mounting boss and the side wall surface of the mounting groove.

[0014] As a further improvement, the second welding seam does not protrude from the end surface of the contact body.

[0015] The beneficial effect is that the utility model belongs to an improved invention. During production, the outer guide sleeve and the contact body are reliably connected by welding. Compared with the prior art, metal particles are not likely to appear or exist in either the welding process or the weld after welding, thus avoiding problems such as insulation failure caused by the release of metal particles during later use. In addition, the weld will not affect the conductive flow too much, ensuring that the moving arc contact still has reliable flow capacity.

[0016] In order to achieve the above-mentioned purpose, the technical solution of the arc extinguishing chamber provided by the utility model is:

[0017] An arc extinguishing chamber is provided with a moving arc contact, which comprises a contact body, an outer guide sleeve is provided on the outer periphery of the contact body, and a first weld is provided between the outer guide sleeve and the contact body to fix the outer guide sleeve and the contact body.

[0018] As a further improvement, a positioning boss is provided on the outer periphery of the contact body, one end of the positioning boss contacts one end of the outer guide sleeve, and the first weld is provided between the positioning boss and the outer guide sleeve.

[0019] As a further improvement, the outer periphery of the positioning boss and the outer guide sleeve are provided with an inwardly concave section relative to the outer periphery, and the inwardly concave sections of the two are arranged at one end where the positioning boss and the outer guide sleeve are close to each other, and the first weld is arranged on the inwardly concave sections of the positioning boss and the outer guide sleeve.

[0020] As a further improvement, the first weld is not higher than the positioning boss and the outer circumferential surface of the outer guide sleeve.

[0021] As a further improvement, the inward section of the positioning boss and the inward section of the outer guide sleeve are equal in length.

[0022] As a further improvement, the moving arc contact further comprises an inner guide sleeve arranged inside the contact body, and a second weld for fixedly connecting the inner guide sleeve and the contact body is provided between the inner guide sleeve and the contact body.

[0023] As a further improvement, a mounting boss is provided on the outer periphery of the end of the inner guide sleeve, a mounting groove is provided on the inner wall of the contact body, the height dimension of the mounting boss is smaller than the depth dimension of the mounting groove, and the second weld is located between the end face of the mounting boss and the side wall surface of the mounting groove.

[0024] As a further improvement, the second welding seam does not protrude from the end surface of the contact body.

[0025] The beneficial effect is that the utility model belongs to an improved invention. During production, the outer guide sleeve and the contact body are reliably connected by welding. Compared with the prior art, metal particles are not likely to appear or exist in either the welding process or the weld after welding, thus avoiding problems such as insulation failure caused by the release of metal particles during later use. In addition, the weld will not affect the conductive flow too much, ensuring that the moving arc contact still has reliable flow capacity.

[0026] In order to achieve the above-mentioned purpose, the technical solution of the circuit breaker provided by the utility model is:

[0027] A circuit breaker comprises a moving arc contact, wherein the moving arc contact comprises a contact body, an outer guide sleeve is provided on the outer periphery of the contact body, and a first weld is provided between the outer guide sleeve and the contact body for fixedly connecting the outer guide sleeve and the contact body.

[0028] As a further improvement, a positioning boss is provided on the outer periphery of the contact body, one end of the positioning boss contacts one end of the outer guide sleeve, and the first weld is provided between the positioning boss and the outer guide sleeve.

[0029] As a further improvement, the outer periphery of the positioning boss and the outer guide sleeve are provided with an inwardly concave section relative to the outer periphery, and the inwardly concave sections of the two are arranged at one end where the positioning boss and the outer guide sleeve are close to each other, and the first weld is arranged on the inwardly concave sections of the positioning boss and the outer guide sleeve.

[0030] As a further improvement, the first weld is not higher than the positioning boss and the outer circumferential surface of the outer guide sleeve.

[0031] As a further improvement, the inward section of the positioning boss and the inward section of the outer guide sleeve are equal in length.

[0032] As a further improvement, the moving arc contact further comprises an inner guide sleeve arranged inside the contact body, and a second weld for fixedly connecting the inner guide sleeve and the contact body is provided between the inner guide sleeve and the contact body.

[0033] As a further improvement, a mounting boss is provided on the outer periphery of the end of the inner guide sleeve, a mounting groove is provided on the inner wall of the contact body, the height dimension of the mounting boss is smaller than the depth dimension of the mounting groove, and the second weld is located between the end face of the mounting boss and the side wall surface of the mounting groove.

[0034] As a further improvement, the second welding seam does not protrude from the end surface of the contact body.

[0035] The beneficial effect is that the utility model belongs to an improved invention. During production, the outer guide sleeve and the contact body are reliably connected by welding. Compared with the prior art, metal particles are not likely to appear or exist in either the welding process or the weld after welding, thus avoiding problems such as insulation failure caused by the release of metal particles during later use. In addition, the weld will not affect the conductive flow too much, ensuring that the moving arc contact still has reliable flow capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a partial cross-sectional view of one type of moving arc contact in the prior art;

[0037] Figure 2 It is a partial cross-sectional view of another moving arc contact in the prior art;

[0038] Figure 3 It is a partial cross-sectional view of an embodiment of a moving arc contact in the utility model.

[0039] Description of reference numerals:

[0040] 1. Contact body; 2. Outer guide sleeve; 3. Screw; 4. Inner guide sleeve; 101. Positioning boss; 102. Mounting groove; 401. Mounting boss. DETAILED DESCRIPTION

[0041] The prior art usually uses threads or screws to install the outer guide sleeve on the contact body of the moving arc contact. During the installation process, metal debris that is difficult to observe and clean is easily generated. In the later use process, the metal debris is released into the circuit breaker, which is easy to cause insulation failure. In order to solve this problem, the basic technical concept of the utility model is to provide a moving arc contact that connects the outer guide sleeve and the contact body by welding. Whether in the welding production process or in the subsequent use process, it is not easy to generate metal debris. At the same time, the weld formed after welding is also equivalent to a conductor, which will not affect the current carrying capacity of the moving arc contact too much.

[0042] The present invention is further described in detail below in conjunction with the embodiments.

[0043] The specific embodiment of the moving arc contact provided by the utility model:

[0044] The moving arc contact provided in this embodiment is as follows Figure 3 As shown, it includes a contact body 1, an outer guide sleeve 2 and an inner guide sleeve 4, the outer guide sleeve 2 is sleeved on the outer periphery of the contact body 1, and a weld is provided between the outer guide sleeve 2 and the contact body 1, and the outer guide sleeve 2 and the contact body 1 are fixedly connected by the weld. In other words, the outer guide sleeve 2 and the contact body 1 are connected by welding.

[0045] Specifically, the welding process can select the vacuum electron beam welding process, the material of the connection part between the outer guide sleeve 2 and the contact body 1 can be copper-chromium alloy, and the specific welding process parameters such as welding speed, welding time, acceleration voltage, frequency and other parameters can be flexibly selected by on-site process personnel according to actual needs.

[0046] In order to accurately locate the installation position of the outer guide sleeve 2, Figure 3 As shown, the outer periphery of the contact body 1 is provided with a positioning boss 101, and the positioning boss 101 can be a complete and continuous annular boss, or a plurality of bosses arranged at intervals. One end of the positioning boss 101 contacts one end of the outer guide sleeve 2, so that during assembly, if one end of the outer guide sleeve 2 just abuts against the positioning boss 101, it can be determined that the outer guide sleeve 2 is installed in place, and the welding operation can be started. At this time, the weld between the outer guide sleeve 2 and the contact body 1 is set between the positioning boss and the outer guide sleeve 2, that is, Figure 3Of course, in other embodiments, the positioning boss 101 may not be provided on the contact body 1. In order to position the outer guide sleeve 2, a process fixture may be provided to position the outer guide sleeve 2. In this case, the weld may also be provided between the end surface of the outer guide sleeve 2 and the outer peripheral surface of the contact body 1. Preferably, the positioning boss 101 and the contact body 1 are integrally formed.

[0047] On the basis of providing the positioning boss 101, further, as Figure 3 As shown, the outer periphery of the outer guide sleeve 2 and the positioning boss 101 are both provided with an inwardly concave section relative to the outer periphery, and the inward sections of the two are both arranged at one end of the two that is close to each other. At this time, before welding, the positions where the inward sections of the outer guide sleeve 2 and the positioning boss 101 cooperate with each other form a process groove or a welding groove, so that after welding, the weld can be accommodated in the process groove. Specifically, the inward dimension of the inward section can be 2mm-4mm. In order to ensure that the overall outer peripheral surface of the moving arc contact is relatively smooth, the weld between the outer guide sleeve 2 and the positioning boss 101 is preferably not protruding from the outer periphery of the positioning boss and the outer guide sleeve (the outer periphery of the non-inward section). In other words, at this time, the weld is completely hidden in the above-mentioned process groove. Of course, in other embodiments, the inward section may not be provided, and the end of the positioning boss 101 may be directly welded after contacting the end of the outer guide sleeve 2. Further, in order to ensure that the weld is more evenly distributed between the outer guide sleeve 2 and the positioning boss 101, the length dimension of the inward section of the two ( Figure 3 left and right directions) are equal.

[0048] The inner guide sleeve 4 and the contact body 1 can also be connected by the same welding process, that is, a second weld is provided between the inner guide sleeve 4 and the contact body 1 to fix the inner guide sleeve 4 and the contact body 1 (the weld between the outer guide sleeve 2 and the positioning boss 101 is defined as the first weld). Figure 3 Specifically, the connection position of the inner guide sleeve 4 connected to the contact body 1 can be made of copper or copper alloy. This can improve the reliability of the connection between the inner guide sleeve 4 and the contact body 1.

[0049] Consistent with the prior art, the inner wall of the contact body 1 is provided with a mounting groove 102, the outer periphery of the inner guide sleeve 4 is provided with a mounting boss 401, the mounting boss 401 and the mounting groove 102 are installed in coordination, and the height dimension of the mounting boss 401 is ( Figure 3 The left and right direction in the mounting groove 102 is smaller than the depth dimension of the mounting groove 102. Thus, after the installation is completed (before welding), the end position of the inner guide sleeve 4 is lower than the position of the contact body 1. This step difference can be used to accommodate the weld. At this time, the weld is set between the side wall surface of the mounting groove 102 and the end surface of the mounting boss 401. Specifically, the height of the above-mentioned step difference can be flexibly set according to needs, so that the weld does not protrude from the end surface of the contact body 1, ensuring that the end of the moving arc contact is relatively smooth.

[0050] Of course, since the contact body 1 and the inner guide sleeve 4 are in a tight fit, in other embodiments, the opening at one end of the inner guide sleeve 4 can also be stamped to a larger size to form an interference fit between the contact body 1 and the inner guide sleeve 4, which is also a way to connect the inner guide sleeve 4 and the contact body 1.

[0051] According to the analysis, the outer guide sleeve 2 and the contact body 1 in this embodiment are connected and fixed by welding. Compared with the threaded connection, the welding process includes the process of melting and combining the outer guide sleeve 2 and the contact body 1 to form a weld. This process is not easy to produce metal particles, and the weld is relatively dense and less likely to contain metal particles, thereby solving the problem of metal particles being easily generated in the traditional solution of connecting the outer guide sleeve 2 and the contact body 1 by threaded connection. At the same time, the weld can also be regarded as a conductor, which will not affect the overall current conduction capacity of the moving arc contact too much.

[0052] Specific embodiment of the arc extinguishing chamber in the utility model:

[0053] The arc extinguishing chamber is provided with the moving arc contact described in the above moving arc contact embodiment, which will not be described in detail here.

[0054] Specific embodiment of the circuit breaker in the utility model:

[0055] The circuit breaker includes the moving arc contact described in the above-mentioned embodiment of the moving arc contact, which will not be described in detail here.

[0056] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A moving arc contact, comprising a contact body, the outer peripheral sleeve of the contact body is provided with an outer guide sleeve, characterized in that: A first weld is provided between the outer guide sleeve and the contact body for fixedly connecting the outer guide sleeve and the contact body.

2. The moving arc contact according to claim 1, characterized in that: A positioning boss is arranged on the outer periphery of the contact body, one end of the positioning boss contacts one end of the outer guide sleeve, and a first weld is arranged between the positioning boss and the outer guide sleeve.

3. The moving arc contact according to claim 2, characterized in that: The outer periphery of the positioning boss and the outer guide sleeve are both provided with an inwardly concave section relative to the outer periphery, and the inwardly concave sections of the two are arranged at one end where the positioning boss and the outer guide sleeve are close to each other, and the first weld is arranged on the inwardly concave sections of the positioning boss and the outer guide sleeve.

4. The moving arc contact according to claim 3, characterized in that: The first weld is not higher than the outer peripheral surface of the positioning boss and the outer guide sleeve.

5. The moving arc contact according to claim 3, characterized in that: The lengths of the inner section of the positioning boss and the inner section of the outer guide sleeve are equal.

6. The moving arc contact according to claim 1, 2 or 3, characterized in that: The moving arc contact also includes an inner guide sleeve arranged inside the contact body, and a second weld for fixedly connecting the inner guide sleeve and the contact body is provided between the inner guide sleeve and the contact body.

7. The moving arc contact according to claim 6, characterized in that: The outer periphery of the end of the inner guide sleeve is provided with a mounting boss, the inner wall of the contact body is provided with a mounting groove, the height dimension of the mounting boss is smaller than the depth dimension of the mounting groove, and the second weld is located between the end face of the mounting boss and the side wall face of the mounting groove.

8. The moving arc contact according to claim 7, characterized in that: The second welding seam does not protrude from the end surface of the contact body.

9. An arc extinguishing chamber, the arc extinguishing chamber being provided with a moving arc contact, characterized in that: The moving arc contact is the moving arc contact in any one of claims 1-8.

10. A circuit breaker comprising a moving arc contact, characterized in that: The moving arc contact is the moving arc contact in any one of claims 1-8.

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