A direct current contactor

Abstract

The utility model discloses a direct current contactor, including the casing, the casing top is fixed with the ceramic cover, and the ceramic cover top is fixed with the outgoing end, the casing is vertically passed to have the push rod, and the push rod top is fixed with the moving piece, and the compression spring is installed between the moving piece and the casing top surface, the push rod bottom is connected with the moving magnet, and the coil frame that is wound with the electromagnetic coil is installed to the moving magnet outer periphery, and the static magnet is installed above the moving magnet. The utility model keeps the closing, need not to give the coil power supply continuously, saves the energy, and the direct current contactor is not easy to make the temperature heat failure of causing, when the opening, electromagnetic repulsion and spring reaction force open together, in the overstroke, the opening force is bigger, and the contactor contact obtains higher rigid separation speed, and the opening speed is faster.

Description

Technical Field

[0001] This utility model relates to the field of electrical engineering, and in particular to a DC contactor. Background Technology

[0002] Existing DC contactors, such as the DC contactor with coil control module disclosed in utility model CN201520563872, typically require a coil to generate magnetic force to keep the contactor in the closed contact state. When it is necessary to enter the open state, the power is cut off, and the compressed spring rebounds, causing the contactor to open. However, this method has the disadvantage of requiring the coil to be continuously energized while maintaining the closed state. This not only wastes power but also generates heat, causing the contactor to overheat and making it more prone to burnout. Furthermore, the spring force alone is used for the open-circuit opening, resulting in a relatively slow opening speed. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model proposes a DC contactor.

[0004] The objective of this utility model is achieved through the following technical solution:

[0005] A DC contactor includes a housing, a ceramic cover fixed to the top of the housing, and a lead-out terminal fixed to the top of the ceramic cover; a push rod vertically passes through the housing, a movable plate fixed to the top of the push rod, a compression spring installed between the movable plate and the top surface of the housing, a moving magnet connected to the bottom of the push rod, a coil frame with an electromagnetic coil wound around the periphery of the moving magnet, and a stationary magnet installed above the moving magnet.

[0006] In a further improvement, the moving magnet is a moving iron core or a moving magnet.

[0007] In a further improvement, a magnetic guide ring, which is fixedly connected to the coil frame, is installed around the lower part of the outer periphery of the moving magnet.

[0008] In a further improvement, the static magnet is a ring magnet.

[0009] In a further improvement, the static magnet is fixed to the mounting bracket, which is then fixed to the protective sleeve that is fixedly connected to the housing.

[0010] In a further improvement, a second spring is installed between the stationary magnet and the moving magnet.

[0011] In a further improvement, the housing includes a U-shaped yoke with a cover plate fixed to the top of the yoke.

[0012] The beneficial effects of this utility model are as follows:

[0013] 1. When the circuit is closed, there is no need to continuously supply power to the coil, saving energy and reducing the risk of overheating and causing malfunctions in the DC contactor.

[0014] 2. When the circuit breaker is tripped, the electromagnetic repulsion force and the spring reaction force work together to trip the circuit breaker. Within the overtravel range, the tripping force is greater, the contactor contacts obtain a higher tripping speed, and the tripping speed is faster. Attached Figure Description

[0015] The present invention will be further described with reference to the accompanying drawings, but the content of the drawings does not constitute any limitation on the present invention.

[0016] Figure 1 This is a schematic diagram of the structure of Example 1. Detailed Implementation

[0017] To make the purpose, technical solution and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and examples.

[0018] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.

[0019] Example 1

[0020] like Figure 1 The DC contactor shown includes a ceramic cover (not shown), a lead-out terminal (not shown), a housing 1, a U-shaped yoke 101, a cover plate 102, a push rod 2, a moving plate 3, a compression spring 4, an electromagnetic coil 5, a moving magnet 6, a coil frame 7, a magnetic ring 9, a mounting bracket 10, a protective sleeve 11, and a second spring 12.

[0021] The push rod 2 passes through the housing 1 and has a movable plate 3 fixed at the top and a movable magnet 6 fixed at the bottom. The movable magnet is located inside the coil frame 7, and an electromagnetic coil 5 is wound around the outside of the coil frame 7. A stationary magnet 8, which is a permanent magnet, is installed above the movable magnet 6.

[0022] When closing the circuit is required, the electromagnetic coil 5 is energized, creating an upward magnetic field that pushes the moving magnet 6 upward. The moving magnet 6 pushes the push rod 2 upward until the moving piece 3 contacts the lead-out end, thus closing the circuit. At this time, the moving magnet 6 contacts and is attracted to the stationary magnet 8. Then, the electromagnetic coil 5 is de-energized. Since the moving magnet 6 and the stationary magnet 8 are in contact and attracted, the attraction force between the moving magnet 6 and the stationary magnet 8 overcomes the spring force of the compression spring 4. Thus, even when the electromagnetic coil 5 is de-energized, the attraction between the moving piece 3 and the lead-out end can be maintained. When opening the circuit is required, a reverse current is applied to the electromagnetic coil 5, which generates a downward magnetic field that pushes the moving magnet 6 downward. At this time, the magnetic field generated by the electromagnetic coil 5 and the spring force cause the moving magnet 6 and the stationary magnet 8 to separate, and the stationary magnet 8 drives the push rod 2 downward. Since magnetic force is inversely proportional to distance, after a certain distance of separation, the attraction force between the moving magnet 6 and the stationary magnet 8 is less than the sum of the weight of the stationary magnet and the compression spring force, thus maintaining the open state. Moreover, during tripping, the electromagnetic repulsion and spring reaction force work together to trip the circuit. Within the overtravel range, the tripping force is greater, and the contactor contacts achieve a higher tripping speed.

[0023] The moving magnet 6 is either a moving iron core or a moving magnet. When it is a moving iron core, it is magnetized by the stationary magnet 8, forming a magnetic attraction structure where they attract each other.

[0024] A magnetic ring 9 is fixed inside the coil frame 7. The stationary magnet 8 is a ring magnet.

[0025] Furthermore, a second spring 12 is installed between the stationary magnet 8 and the moving magnet 6, so that the stationary magnet 8 and the moving magnet 6 remain separated when the coil is not energized after the circuit is opened.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the essence and scope of the technical solution of this utility model.

Claims

1. A DC contactor, comprising a housing (1), a ceramic cover fixed to the top of the housing (1), and a lead-out end fixed to the top of the ceramic cover; a push rod (2) vertically passing through the housing (1), a movable piece (3) fixed to the top of the push rod (2), and a compression spring (4) installed between the movable piece (3) and the top surface of the housing (1), characterized in that, The bottom of the push rod (2) is connected to a moving magnet (6), and a coil frame (7) with an electromagnetic coil (5) wound around the outer periphery of the moving magnet (6) is installed. A stationary magnet (8) is installed above the moving magnet (6).

2. The DC contactor as described in claim 1, characterized in that, The moving magnet (6) is a moving iron core or a moving magnet.

3. The DC contactor as described in claim 1, characterized in that, The lower part of the outer periphery of the moving magnet (6) is surrounded by a magnetic ring (9) that is fixedly connected to the coil frame (7).

4. The DC contactor as described in claim 1, characterized in that, The stationary magnet (8) is a ring magnet.

5. The DC contactor as described in claim 1, characterized in that, The static magnet (8) is fixed on the mounting bracket (10), and the mounting bracket (10) is fixed on the protective sleeve (11) which is fixedly connected to the housing (1).

6. The DC contactor as described in claim 1, characterized in that, A second spring (12) is installed between the stationary magnet (8) and the moving magnet (6).

7. The DC contactor as described in claim 1, characterized in that, The housing (1) includes a U-shaped yoke (101), and a cover plate (102) is fixed to the top of the U-shaped yoke (101).

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