Improved contact arm

Abstract

The utility model discloses an improved contact arm which comprises a contact arm body and a protective cover, the protective cover is sleeved on the outer side of the contact arm body, a plurality of detachable radiating fins are clamped on the peripheral surface of the contact arm body, and a plurality of through holes for the radiating fins to pass through are arranged on the protective cover. The heat generated by the contact arm is dissipated backwards through the channel through the cooperation of the heat dissipation opening and the heat dissipation sheet, the temperature rise of the contact arm of the circuit breaker in operation is obviously reduced, meanwhile, the insertion structure of the heat dissipation sheet realizes split replacement, the service life of the contact arm is ensured, and the use cost of the contact arm is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to an improved contact arm. Background Art

[0002] Vacuum contactors utilize vacuum interrupters to extinguish arcs and are used to frequently connect and disconnect normal operating currents. They are typically used for remotely connecting and disconnecting 6kV and 380V (660V and 1140V) AC motors with medium and low voltages that are frequently started and stopped. Vacuum contactors typically consist of an insulating frame, a metal base, a transmission crank arm, an electromagnetic system, an auxiliary switch, and a vacuum interrupter. When the control voltage passes through the electromagnetic coil, the armature drives the crank arm to rotate, connecting the main contacts in the vacuum interrupter. When the electromagnetic coil is de-energized, the trip spring causes the main contacts to disconnect.

[0003] During the use of vacuum contactors, the high-intensity current passing through the contact arms will cause the contact arms to heat up significantly. If this heating is not controlled, it will cause the contact arms to overheat, thereby adversely affecting the performance of the contact arms, and the external protection effect of existing contact arms is poor. Utility Model Content

[0004] The purpose of the present utility model is to provide an improved contact arm to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an improved contact arm, comprising a contact arm body and a protective cover, wherein the protective cover is sleeved on the outside of the contact arm body, the outer peripheral surface of the contact arm body is clamped with a plurality of detachable heat sinks, and the protective cover is provided with a plurality of openings for the heat sinks to pass through.

[0006] Furthermore, a groove is provided on the outer peripheral surface of the contact arm body, a heat dissipation port is provided in the groove, the heat dissipation port is connected to the inner wall of the contact arm body, a support adapted to the groove is provided at the bottom of the heat sink, a card block is connected to the bottom end of the support, and the card block can be plugged into the heat dissipation port.

[0007] Furthermore, the size of the through-port is adapted to the size of the heat sink, and the size of the through-port is smaller than the size of the support.

[0008] Furthermore, a plurality of heat dissipation holes are provided on the heat sink.

[0009] Furthermore, the protective cover is made of silicone material.

[0010] Furthermore, the heat sink is not provided on either side of the left or right side of the middle portion of the contact arm body.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] The utility model has a compact structure and novel design. The heat generated by the contact arm is dissipated backward through the channel through the cooperation of the heat dissipation port and the heat sink, which significantly reduces the temperature rise of the circuit breaker contact arm during operation. At the same time, the heat sink plug-in structure realizes split replacement, ensures the service life of the contact arm, and reduces the cost of using the contact arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a structural diagram of an improved contact arm of the utility model;

[0014] Figure 2 This is a cross-sectional view of an improved contact arm of the present utility model.

[0015] In the figure, the contact arm body-1, the protective cover-2, the heat sink-3, the support-4, the clamp-5, the heat dissipation port-6, and the heat dissipation hole-7. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] like Figure 1 and Figure 2 As shown, an improved contact arm includes a contact arm body 1 and a protective cover 2. The protective cover 2 is sleeved on the outside of the contact arm body 1. The outer peripheral surface of the contact arm body 1 is clamped with a plurality of detachable heat sinks 3. The heat sink 3 is provided with a plurality of heat dissipation holes 7. The protective cover 2 is provided with a plurality of through openings for the heat sink 3 to pass through.

[0018] In this embodiment, a groove is provided on the outer peripheral surface of the contact arm body 1, and a heat dissipation outlet 6 is provided in the groove. The heat dissipation outlet 6 is connected to the inner wall of the contact arm body 1. A support 4 adapted to the groove is provided at the bottom of the heat sink 3. A card block 5 is connected to the bottom end of the support 4, and the card block 5 can be plugged into the heat dissipation outlet 6. The size of the through-port is adapted to the size of the heat sink 3, and the size of the through-port is smaller than the size of the support 4.

[0019] In this embodiment, the protective cover 2 is made of silicone material. No heat sink 3 is provided on the left and right sides of the middle of the contact arm body 1. The area without heat sink 3 is convenient for staff to take and operate.

[0020] The working principle of this embodiment is as follows:

[0021] When using the contact arm, first insert each heat sink 3 into the heat dissipation port 6, and then put the protective cover 2 on the outside of the contact arm. The detachable structure of the heat sink 3 can be convenient for maintenance, replacement and transportation. During use, the heat generated by the contact arm body 1 will be transferred to the heat sink 3 through the heat dissipation port 6, and then the heat sink 3 and the heat dissipation holes 7 thereon will dissipate the heat to achieve high heat dissipation performance. The protective cover 2 is put on the outside of the contact arm body 1. On the one hand, it can prevent it from being damaged by direct force, and it can also play a flame retardant role. On the other hand, it can limit and restrain the support 4 to fix the heat sink 3.

[0022] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An improved contact arm, characterized in that: The protective cover is sleeved on the outside of the contact arm body. The outer peripheral surface of the contact arm body is clamped with a plurality of detachable heat sinks. The protective cover is provided with a plurality of through holes for the heat sinks to pass through.

2. The improved contact arm according to claim 1, characterized in that: A groove is provided on the outer peripheral surface of the contact arm body, a heat dissipation port is provided in the groove, the heat dissipation port is connected to the inner wall of the contact arm body, a support adapted to the groove is provided at the bottom of the heat sink, a card block is connected to the bottom end of the support, and the card block can be plugged into the heat dissipation port.

3. The improved contact arm according to claim 2, characterized in that: The size of the through-port is adapted to the size of the heat sink, and is smaller than the size of the support.

4. The improved contact arm according to claim 1, characterized in that: A plurality of heat dissipation holes are provided on the heat dissipation fin.

5. The improved contact arm according to claim 1, characterized in that: The protective cover is made of silicone material.

6. The improved contact arm according to claim 1, characterized in that: The heat sink is not provided on either the left or right side of the middle portion of the contact arm body.

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