Static contact assembly for a handcart-type circuit breaker, handcart-type circuit breaker and switchgear

Abstract

The utility model provides a kind of for handcart type circuit breaker's static contact component, handcart type circuit breaker and switch cabinet, static contact component includes tubular branch bus, static contact component further includes: static contact, it is fixed in one end of the tubular branch bus, the static contact is with the tubular branch bus interference fit, the outer diameter of the static contact is greater than the outer diameter of the tubular branch bus.

Description

Technical Field

[0001] This utility model relates to the field of power systems, and in particular to stationary contact assemblies for handcart-type circuit breakers, handcart-type circuit breakers, and switch cabinets. Background Technology

[0002] Switchgear is a very important piece of equipment in power systems. Among them, the truck-mounted circuit breaker is an important component of the switchgear. The truck-mounted circuit breaker has stationary contacts and moving contacts. The stationary contacts are located in a contact box, and the tubular branch busbar extends into the interior of the contact box through an opening in the side wall of the contact box to connect with the stationary contacts.

[0003] When a handcart-type circuit breaker is in operation, the stationary and moving contacts come into contact, generating a large amount of heat. Therefore, heat dissipation is an urgent problem to be solved. Utility Model Content

[0004] In view of this, the present invention proposes a stationary contact assembly for a handcart-type circuit breaker, comprising: a tubular branch busbar, and the stationary contact assembly further comprising:

[0005] A stationary contact is fixed to one end of the tubular branch busbar. The stationary contact is interference-fitted with the tubular branch busbar, and the outer diameter of the stationary contact is larger than the outer diameter of the tubular branch busbar.

[0006] In this invention, by using an interference fit to fix a stationary contact with a larger outer diameter onto a tubular branch busbar, it is possible to use a tubular branch busbar with a smaller diameter to save costs, and to use a stationary contact with a larger outer diameter to increase the contact area with the moving contact, thereby reducing heat generation.

[0007] Optionally, the stationary contact assembly described above can be a copper sleeve, which is fixed to the tubular branch busbar using a heat-shrinking process. The heating temperature in this process is below the recrystallization temperature of copper. This ensures that the hardness of the copper material on the outer surface of the stationary contact remains almost unchanged from its initial hardness before heating, thus not affecting the performance of the stationary contact.

[0008] According to the stationary contact assembly described above, optionally, the stationary contact is a cylindrical body and is sleeved on the outside of the tubular branch busbar, with openings at both opposite ends. In this way, the other end of the stationary contact can block the tubular branch busbar and limit its movement to prevent it from protruding from the stationary contact.

[0009] According to the stationary contact assembly described above, optionally, the tubular branch busbar can extend into the interior of the stationary contact from a first opening at one end of the stationary contact, and the diameter of the second opening at the other end of the stationary contact is smaller than the outer diameter of the tubular branch busbar. In this way, the other end of the stationary contact can block the tubular branch busbar and limit its movement to prevent it from extending out of the stationary contact.

[0010] According to the stationary contact assembly described above, optionally, the end of the tubular branch busbar used to fix one end of the stationary contact has a first arcuate surface. This first arcuate surface can serve a guiding function.

[0011] According to the stationary contact assembly described above, optionally, the sidewall of the stationary contact facing the tubular branch busbar and the end away from the moving contact has a second arcuate surface. This second arcuate surface serves a guiding function.

[0012] Optionally, according to the stationary contact assembly described above, the tubular branch busbar has a plurality of through holes. The presence of these through holes allows the tubular branch busbar to be installed in other ways.

[0013] Optionally, the tubular branch busbar is made of copper, according to the stationary contact assembly described above.

[0014] Optionally, the tubular branch busbar and the stationary contact can be designed separately, according to the stationary contact assembly described above. This simplifies the process and facilitates manufacturing.

[0015] This utility model also provides a trolley circuit breaker, including a stationary contact assembly for a trolley circuit breaker as described in any of the preceding claims.

[0016] This utility model further provides a switch cabinet, including a stationary contact assembly for a handcart-type circuit breaker as described in any of the preceding claims. Attached Figure Description

[0017] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the above and other features and advantages of the present invention, in which:

[0018] Figure 1 This is a schematic diagram of the assembled static contact assembly for a handcart-type circuit breaker.

[0019] Figure 2 This is a schematic diagram of the split structure of the stationary contact assembly used in a handcart-type circuit breaker.

[0020] Figure 3 This is a cross-sectional schematic diagram of a portion of the stationary contact assembly used in a handcart-type circuit breaker.

[0021] The reference numerals in the attached figures are as follows:

[0022] 1-Tube branch busbar

[0023] 11-flat body

[0024] 12-The bent part

[0025] 13-First Arc Surface

[0026] 14-Through Hole

[0027] 2-Stationary contact

[0028] 21-First Opening

[0029] 22-Second Opening

[0030] 23-Second Arc Surface Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the following embodiments are provided to further illustrate this utility model in detail. The nouns and pronouns referring to "person" in this patent application are not limited to specific genders.

[0032] The larger the contact area between the stationary and moving contacts, the smaller the circuit resistance, and therefore the less heat is generated. Based on this, the inventors thought of installing a stationary contact with a larger outer diameter at one end of the tubular branch busbar to increase the contact area between the stationary and moving contacts, reduce the circuit resistance, and thus reduce the heat generation.

[0033] like Figure 1 The diagram shown is a structural schematic of the assembled stationary contact assembly for a handcart-type circuit breaker. Figure 2 The diagram shown is a schematic representation of the split structure of the stationary contact assembly used in a handcart-type circuit breaker. Figure 3 The diagram shown is a cross-sectional view of a portion of the stationary contact assembly for a handcart-type circuit breaker. The stationary contact assembly 2 includes a tubular branch busbar 1 and a stationary contact 2.

[0034] As an example, the tubular branch busbar 1 is made of copper, which not only reduces cost but also provides good current carrying capacity. The end of the tubular branch busbar 1 away from the stationary contact 2 has a flat body 11 for connecting copper busbars. The tubular branch busbar 1 has a bent portion 12 to change the direction of the tubular branch busbar 1 so that the stationary contact 2 can be installed to contact the moving contact.

[0035] The stationary contact 2 is fixed to one end of the tubular branch busbar 1. The stationary contact 2 and the tubular branch busbar 1 are interference-fitted, and the outer diameter of the stationary contact 2 is larger than the outer diameter of the tubular branch busbar 1. As an example, the stationary contact 2 is made of copper, which not only reduces cost but also provides good current-carrying capacity. The inner diameter of the stationary contact 2 can be the same as the outer diameter of the tubular branch busbar 1, or slightly smaller than the outer diameter of the tubular branch busbar 1, to achieve the interference fit.

[0036] Compared to the stationary contact 2, whose outer diameter is the same as that of the tubular branch busbar 1, Figure 1 The stationary contact 2 has a larger lateral area, thus allowing for more contact points with the moving contact, thereby increasing the contact area with the moving contact. For example, if the moving contact is a cloverleaf contact, it can have more fingers to increase the contact points with the stationary contact 2.

[0037] As an example, the two parts are designed separately but can be fixed together by interference fit, which simplifies the process and makes manufacturing easier.

[0038] In this invention, by fixing the stationary contact 2 with a larger outer diameter to the tubular branch busbar 1 with an interference fit, it is possible to use the tubular branch busbar 1 with a smaller diameter to save costs, and to use the stationary contact 2 with a larger outer diameter to increase the contact area with the moving contact, thereby reducing heat generation.

[0039] As an example, the stationary contact 2 is a copper sleeve. It is fixed to the tubular branch busbar 1 using a heat-fitting process. The heating temperature in this process is below the recrystallization temperature of copper, ensuring that the hardness of the copper material on the outer surface of the stationary contact 2 remains almost unchanged from its initial hardness before heating, thus not affecting its performance. The basic principle of this heat-fitting process is to utilize the property of thermal expansion and contraction to easily assemble the stationary contact 2 into the tubular branch busbar 1. The heat-fitting process achieves an interference fit between the stationary contact 2 and the tubular branch busbar 1, resulting in high reliability.

[0040] As an example, the stationary contact 2 is a cylindrical body and is sleeved on the outside of the tubular branch busbar 1. Both ends of the stationary contact 2 have openings, which facilitates installation and positioning. For example, such as... Figures 1 to 3 As shown, the tubular branch busbar 1 can extend into the interior of the stationary contact 2 through the first opening 21 at one end of the stationary contact 2, and the diameter of the second opening 22 at the other end of the stationary contact 2 is smaller than the outer diameter of the tubular branch busbar 1. In this way, the other end of the stationary contact 2 can block the tubular branch busbar 1 and limit the tubular branch busbar 1 to prevent it from extending out of the stationary contact 2.

[0041] As an example, such as Figure 2 and Figure 3 As shown, the end of the tubular branch busbar 1 used to fix the stationary contact 2 has a first arc-shaped surface 13. The end of the tubular branch busbar 1 and the side away from the axis of the tubular branch busbar 1 have the first arc-shaped surface 13, which can play a guiding role, so that the tubular branch busbar 1 can be easily inserted into the stationary contact 2 during the process of extending into the stationary contact 2.

[0042] As an example, the sidewall of the stationary contact 2 facing the tubular branch busbar 1 and the end away from the moving contact has a second arcuate surface 23, such as... Figure 2 and Figure 3 As shown. During the process of the tubular branch busbar 1 extending into the stationary contact 2, the second arc-shaped surface 23 can play a guiding role, making it easier for the tubular branch busbar 1 to be inserted into the stationary contact 2.

[0043] As an example, the tubular branch busbar 1 has multiple through holes 14, the presence of which allows the tubular branch busbar 1 to be installed in other ways. Of course, the tubular branch busbar 1 may also not have through holes 14, depending on actual needs.

[0044] This utility model also provides a handcart-type circuit breaker, including the stationary contact 2 assembly for the handcart-type circuit breaker as described in any of the preceding claims.

[0045] This utility model also provides a switch cabinet, including the stationary contact assembly for a handcart-type circuit breaker as described in any of the preceding claims.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stationary contact assembly for a handcart-type circuit breaker, comprising: The tubular branch busbar (1) is characterized in that the stationary contact assembly further includes: A stationary contact (2) is fixed to one end of the tubular branch busbar (1). The stationary contact (2) is interference-fitted with the tubular branch busbar (1). The outer diameter of the stationary contact (2) is larger than the outer diameter of the tubular branch busbar (1).

2. The stationary contact assembly according to claim 1, characterized in that, The stationary contact (2) is a copper sleeve. The stationary contact (2) is fixed to the tubular branch busbar (1) by a heat-shrinking process. The heating temperature in the heat-shrinking process is below the recrystallization temperature of copper.

3. The stationary contact assembly according to claim 1, characterized in that, The stationary contact (2) is a cylindrical body and is sleeved on the outside of the tubular branch busbar (1). Both ends of the stationary contact (2) have openings.

4. The stationary contact assembly according to claim 3, characterized in that, The tubular branch busbar (1) can extend into the interior of the stationary contact (2) from the first opening at one end of the stationary contact (2), and the diameter of the second opening at the other end of the stationary contact (2) is smaller than the outer diameter of the tubular branch busbar (1).

5. The stationary contact assembly according to claim 1, characterized in that, The end of the tubular branch busbar (1) used to fix one end of the stationary contact (2) has a first arcuate surface (13).

6. The stationary contact assembly according to claim 1, characterized in that, The sidewall of the stationary contact (2) facing the tubular branch busbar (1) and away from the moving contact has a second arcuate surface (23).

7. The stationary contact assembly according to claim 1, characterized in that, The tubular branch busbar (1) has multiple through holes (14); and / or The tubular branch busbar (1) is made of copper.

8. The stationary contact assembly according to claim 1, characterized in that, The tubular branch busbar (1) and the stationary contact (2) are designed separately.

9. A handcart-type circuit breaker, characterized in that, Includes the stationary contact assembly for a handcart-type circuit breaker according to any one of claims 1-8.

10. A switch cabinet, characterized in that, Includes the stationary contact assembly for a handcart-type circuit breaker according to any one of claims 1-8.

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