Electromagnetic contactor

Abstract

The electromagnetic contactor comprises a machine body part and a pole plate part, the machine body part comprises an electromagnetic driving assembly, a movable iron core, a movable contact assembly, a main contact, an auxiliary switch, a reset spring, a movable contact spring and a static contact assembly, the electromagnetic driving assembly is connected with the movable contact assembly, the reset spring is fixed at the front end of the movable contact assembly, and the static contact assembly is connected with the movable iron core. The reset spring is embedded into the static contact assembly, the moving contact assembly and the static contact assembly are respectively connected with the main contact, and when the electromagnetic driving assembly is electrified, the moving iron core and the moving contact assembly are driven, so that the main contact is closed and the auxiliary switch is switched; when the electromagnetic driving assembly loses power, the moving contact assembly is separated from the static contact assembly under the spring counterforce of the reset spring and the moving contact spring, and the auxiliary switch is switched. The service life of the electromagnetic valve is greatly prolonged, the polar plates extend to the two sides of the arc striking piece in a polarity conduction mode, and space is saved.

Description

Technical Field

[0001] The utility model relates to the field of design and development of electromagnetic contactors, in particular to an electromagnetic contactor with a long electromagnetic valve life and low gas leakage. Background Art

[0002] An electromagnetic contactor is an electrical appliance in industry that uses a coil to generate a magnetic field to close the contacts in order to control the load. The main control object of the electromagnetic contactor is the motor. In addition, it is also used for other electrical loads, such as electric heaters, electric welders, and lighting equipment. The contactor can not only connect and disconnect the circuit, but also has a low-voltage release protection function. Existing electromagnetic contactors mostly use pressurized gas to attract the moving and static contacts. The pressurized gas is energized and controlled by the solenoid valve. The above-mentioned electromagnetic contactors generally have the problem of short solenoid valve life and easy leakage and loss of function. Utility Model Content

[0003] Purpose of the utility model: The purpose of the utility model is to provide an electromagnetic contactor with a long electromagnetic valve life and low leakage.

[0004] Technical solution: The utility model device includes a body part and a pole plate part, the body part includes an electromagnetic drive assembly, a moving iron core, a moving contact assembly, a main contact, an auxiliary switch, a reset spring, a moving contact spring and a static contact assembly, the electromagnetic drive assembly is connected to the moving contact assembly, a reset spring is fixed to the front end of the moving contact assembly, the reset spring is embedded in the static contact assembly, the moving contact assembly and the static contact assembly are respectively connected to the main contact, when the electromagnetic drive assembly is energized, the moving iron core and the moving contact assembly are driven to close the main contact and switch the auxiliary switch; when the electromagnetic drive assembly loses power, the moving contact assembly is separated from the static contact assembly under the spring reaction force of the reset spring and the moving contact spring, and the auxiliary switch is switched.

[0005] Furthermore, the pole plate part includes an arc, an arc extinguishing chamber, an arc striking angle and a grid piece. An arc extinguishing chamber is arranged above the main contact, and a grid piece is arranged in the arc extinguishing chamber.

[0006] Furthermore, an arc is generated between the main contacts, and the arc moves upward and first enters the arc striking angle, and then enters the arc extinguishing chamber through the arc striking angle and is divided by the grid.

[0007] Furthermore, the arc striking angle is connected to the moving contact assembly, and an arc extinguishing chamber is located above the arc striking angle.

[0008] Furthermore, the moving iron core is arranged inside the axis of the electromagnetic drive component.

[0009] Furthermore, the moving contact spring is arranged at the lower end of the moving contact assembly.

[0010] Furthermore, the auxiliary switch is connected to the moving contact assembly via a linkage rod and a cam.

[0011] Beneficial effects: Compared with the prior art, the utility model has the following advantages: through electromagnetic drive, the auxiliary switch and the moving contact can be controlled simultaneously, so that the solenoid valve is not prone to losing function due to air leakage, and the life of the solenoid valve is greatly extended. The pole plate extends to both sides of the arc-starting piece in a polarity conduction manner, saving space. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the body part;

[0013] Figure 2 This is the schematic diagram of the body part;

[0014] Figure 3 It is a structural schematic diagram of the plate part;

[0015] Figure 4 This is the schematic diagram of the plate part;

[0016] Figure 5 It is a three-dimensional structure diagram of the present invention. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0018] The utility model device comprises a body part and a plate part, as shown in the attached Figure 1 As shown, the body part includes an electromagnetic drive component 1, a moving iron core 2, a moving contact component 3, a main contact 4, an auxiliary switch 5, a reset spring 6, a moving contact spring 7 and a static contact component 8. The electromagnetic drive component 1 is connected to the moving contact component 3. The front end of the moving contact component 3 is fixed with a reset spring 6, and the reset spring 6 is embedded in the static contact component 8. The moving contact component 3 and the static contact component 8 are respectively connected to the main contact 4. Figure 2 As shown, when the electromagnetic drive assembly 1 is energized, it drives the moving iron core 2 and the moving contact assembly 3, so that the main contact 4 is closed and the auxiliary switch 5 is switched; when the electromagnetic drive assembly 1 is de-energized, the moving contact assembly 3 is separated from the static contact assembly 8 under the spring reaction force of the reset spring 6 and the moving contact spring 7, and the auxiliary switch 5 is switched.

[0019] like Figure 3 As shown, the plate portion includes an arc 9, an arc extinguishing chamber 10, an arc striking angle 11 and a grid 12. The arc extinguishing chamber 10 is arranged above the main contact 4, and the grid 12 is arranged in the arc extinguishing chamber 10. The arc striking angle 11 is connected to the moving contact assembly 3, and the arc extinguishing chamber 10 is arranged above the arc striking angle 11. Figure 4 As shown, an arc 9 is generated between the main contacts 4, and the arc 9 moves upward and first enters the arc striking angle 11, and then enters the arc extinguishing chamber 10 through the arc striking angle 11 and is divided by the grid 12. The arc is extinguished after the ionized gas is deionized.

[0020] Electromagnetic drive is driven by the Ampere force generated by the electromagnetic coil being energized. The electromagnetic coil is made of enameled wire, the base of the static contact and the moving contact is made of copper, the linkage rod is made of super engineering plastic, and the cam is made of nylon.

[0021] like Figure 5 As shown, this contactor is driven by electromagnetic force to realize a linkage mechanism that simultaneously controls the actions of the auxiliary switch and the moving contact.

[0022] When the electromagnetic coil is energized, it generates electromagnetic force, drives the linkage mechanism to move, drives the moving contact assembly 3 to close with the static contact, and the linkage rod follows the moving contact assembly to drive the cam to rotate and the auxiliary switch to operate. This mechanism converts the horizontal force and finally realizes the control of the cam rotation.

[0023] In addition, when the electromagnetic drive is energized, the reset spring 6 is compressed when the moving contact assembly 3 and the stationary contact are attracted, and accumulates energy. When the electromagnetic drive is de-energized, the reset spring 6 releases the energy to achieve reset.

[0024] When the driving electromagnetic coil loses power, the reset spring 6 drives the linkage mechanism to operate, driving the moving contact and the static contact to separate. At this time, if current passes through the moving and static contacts, according to the right-hand screw rule, the arc extinguishing coil generates a magnetic field, and according to the left-hand rule of Lorentz force, the arc blows toward the upper arc extinguishing cover.

[0025] The pole plates of this contactor are extended to both sides of the arc-starting piece by polarity conduction, which cleverly utilizes the left-hand rule of Lorentz force and saves space.

[0026] The working principle of the contactor is as follows: the contactor coil is energized, causing the static iron core to generate a magnetic field, which attracts the moving iron core. The moving iron core drives the linkage mechanism, driving the moving and static contacts to attract. The upper and lower copper bars are connected to the rated working voltage, and the main circuit is turned on due to the attraction of the moving and static contacts. At the same time, the auxiliary circuit is also turned on due to the action of the linkage mechanism. The arc generated by the main circuit is cut off or eliminated by the arc extinguishing hood. When the main circuit is turned on, the arc extinguishing coil generates a magnetic field, thereby generating a Lorentz force to lead the arc to the arc-starting plate, which leads the arc into the arc-extinguishing hood. The arc is cut and eliminated by the grid in the arc-extinguishing hood to prevent the arc from leaking and causing safety hazards.

Claims

1. An electromagnetic contactor, characterized in that: The invention comprises a body part and a pole plate part, wherein the body part comprises an electromagnetic drive assembly (1), a moving iron core (2), a moving contact assembly (3), a main contact (4), an auxiliary switch (5), a reset spring (6), a moving contact spring (7) and a static contact assembly (8); the electromagnetic drive assembly (1) is connected to the moving contact assembly (3); a reset spring (6) is fixed to the front end of the moving contact assembly (3); the reset spring (6) is embedded in the static contact assembly (8); the moving contact assembly (3) and the static contact assembly (8) are respectively connected to the main contact (4); when the electromagnetic drive assembly (1) is energized, the moving iron core (2) and the moving contact assembly (3) are driven to close the main contact (4) and switch the auxiliary switch (5); when the electromagnetic drive assembly (1) is de-energized, the moving contact assembly (3) is separated from the static contact assembly (8) under the spring reaction force of the reset spring (6) and the moving contact spring (7), and the auxiliary switch (5) is switched.

2. The electromagnetic contactor according to claim 1, characterized in that: The pole plate part comprises an arc (9), an arc extinguishing chamber (10), an arc striking angle (11) and a grid piece (12); the arc extinguishing chamber (10) is arranged above the main contact (4), and the grid piece (12) is arranged in the arc extinguishing chamber (10).

3. The electromagnetic contactor according to claim 2, characterized in that: An arc (9) is generated between the main contacts (4), and the arc (9) moves upward and first enters an arc striking angle (11), and then enters an arc extinguishing chamber (10) through the arc striking angle (11) and is divided by a grid (12).

4. The electromagnetic contactor according to claim 2, characterized in that: The arc striking angle (11) is connected to the moving contact assembly (3), and an arc extinguishing chamber (10) is located above the arc striking angle (11).

5. The electromagnetic contactor according to claim 1, characterized in that: The moving iron core (2) is arranged inside the axis of the electromagnetic drive component (1).

6. The electromagnetic contactor according to claim 1, characterized in that: The moving contact spring (7) is arranged at the lower end of the moving contact assembly (3).

7. The electromagnetic contactor according to claim 1, characterized in that: The auxiliary switch (5) is connected to the moving contact assembly (3) via a linkage rod and a cam.

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