CN205016452U - Single -stage vacuum contactor and multistage vacuum contactor thereof - Google Patents

Abstract

The utility model relates to a single-stage vacuum contactor and a multi-stage vacuum contactor thereof. The single-stage vacuum contactor includes an insulating frame and a cover arranged above the insulating frame, and a vacuum arc extinguishing system, an electromagnetic system, an autotransformer rectification energy-saving control module connected with the electromagnetic system are arranged in the insulating frame, The transmission pressure system and the anti-destructive and dust-proof auxiliary switch, the transmission pressure system includes return springs, overtravel springs, movable ejector rods and anti-closing springs arranged in sequence from left to right, and the vacuum arc extinguishing system includes an insulation The housing, the anti-closing spring is set in the insulating housing, the self-transformer rectification energy-saving control module is provided with a transformer, the electromagnetic system includes a coil, and the coil is located on the outer periphery of the return spring. An overtravel push rod is arranged between the overtravel spring and the return force spring. The multi-stage vacuum contactor is composed of two or more single-stage vacuum contactors described above. The beneficial effect of adopting the above structure is that the structure is firm and reliable, and the service life of the product is long.

Description

A single-stage vacuum contactor and its multi-stage vacuum contactor

technical field

The utility model relates to a contactor, in particular to a single-stage vacuum contactor and its multi-stage vacuum contactor.

Background technique

Vacuum contactor is an automatic control electrical appliance. It uses an insulating shell to extinguish the arc. It is mainly used for frequently connecting or breaking AC and DC circuits. It has a large control capacity and can be operated from a long distance. It can be used with relays to achieve timing operations and interlocking. Control, various quantitative control and loss of voltage and undervoltage protection are widely used in automatic control circuits. The main control object is the motor, and it can also be used to control other electrical loads, such as electric heaters, lighting, electric welding machines, capacitor banks, etc. The vacuum contactor has the characteristics of strong arc extinguishing ability, good pressure resistance, high operating frequency, long life, no arc spraying, small size and light weight.

The existing vacuum contactor is mainly composed of an insulating shell and an operating mechanism. The insulating shell has two functions of reliable arc extinguishing when passing the normal working current and cutting off the working current frequently. The operating mechanism is composed of a holding coil with an iron core and an armature. However, during the closing and opening process of the vacuum contactor, the insulating case will be subjected to the reaction force of the overtravel spring. Due to the frequent opening and closing of the vacuum contactor, the insulating shell is frequently subjected to reaction force, which will damage the insulating shell and reduce the insulation capacity, thereby affecting the service life of the vacuum contactor.

On the other hand, the coil of the existing vacuum contactor is usually connected in series with two resistors, whose function is to absorb the current impact at the moment the coil is powered off, and protect the components in the circuit. However, if the resistance is connected in series with the coil, the voltage of the coil is often unstable, and the heating of the coil is very serious, which not only wastes electric energy, but also shortens the life of the contactor because the insulating layer of the coil is easy to age at high temperature.

Therefore, it is necessary to develop a vacuum contactor that has a long service life and is easy to use under the condition of frequent operation and continuous operation, so as to meet the needs of the market.

Utility model content

The purpose of the utility model is to improve the deficiencies of the prior art and provide a single-stage vacuum contactor and its multi-stage vacuum contactor which are easy to use and have a long service life.

In order to achieve the above object, the utility model adopts the following technical solutions:

A single-stage vacuum contactor, comprising an insulating frame and a cover arranged above the insulating frame, a vacuum arc extinguishing system, an electromagnetic system, and an autotransformer rectification energy-saving control module connected with the electromagnetic system are arranged in the insulating frame , a transmission pressure system and an anti-destructive and dust-proof auxiliary switch, the transmission pressure system includes a return spring, an overtravel spring, a movable ejector rod and an anti-closing spring that are arranged in sequence from left to right, and the vacuum arc extinguishing system includes a The insulating housing, the anti-closing spring is placed in the insulating housing, the front end is connected with the movable ejector rod, the self-coupling transformer rectification energy-saving control module is provided with a transformer, the electromagnetic system includes a coil, the The coil is arranged on the outer periphery of the return force spring, and an overtravel push rod is arranged between the overtravel spring and the return force spring.

According to the utility model, an insulating laminate is provided between the return spring and the overtravel spring, and a through hole matching the overtravel ejector pin is provided on the insulating laminate, allowing the overtravel ejector pin to pass through.

According to the utility model, there are four overtravel ejector pins, and there are four through holes on the insulating layer plate.

According to the utility model, an insulator is provided between the overtravel spring and the movable push rod.

According to the utility model, the front end of the movable push rod is covered with a guide sleeve, and the end is placed in the insulating shell.

According to the utility model, the cover is provided with an LED indicator light, and when the single-stage vacuum contactor is working normally, the LED indicator light is always on.

According to the utility model, a scale is also provided on the cover, and the scale is located above the overtravel spring, which can accurately adjust the opening distance and overtravel of the single-stage vacuum contactor.

According to the utility model, the return spring, the overtravel spring and the anti-closing spring are all three-stage flexible springs.

A multi-stage vacuum contactor is composed of two or more single-stage vacuum contactors described above; since the insulating frame of the single-stage vacuum contactor is made of insulating material, the gap between two single-stage vacuum contactors Fully insulated.

The vacuum contactor of the present utility model has the beneficial effects of:

1. The setting of the self-coupling transformer rectification energy-saving control module can maintain a constant voltage source to ensure the voltage stability of the coil and reduce the heating phenomenon of the coil, thereby improving the service life of the coil and thus improving the service life of the single-stage vacuum contactor;

2. The setting of the anti-closing spring can prevent the vacuum arc extinguishing system from being subjected to the reaction force of the overtravel spring, thereby prolonging the service life of the insulating shell;

3. The setting of the ruler can accurately adjust the opening distance and overtravel of the vacuum contactor;

4. When in use, multiple single-stage vacuum contactors can also be used in combination, which is convenient to use.

Description of drawings

Fig. 1 is the structural representation of the single-stage vacuum contactor of the present utility model;

Fig. 2 is a schematic structural view of the cover of the single-stage vacuum contactor of the present invention;

Fig. 3 is the structural representation of multistage vacuum contactor of the present utility model;

Fig. 4 is a schematic structural diagram of the vacuum arc extinguishing system of the present invention.

detailed description

The single-stage vacuum contactor and its multi-stage vacuum contactor of the present invention will be further described in detail below in conjunction with specific drawings.

As shown in Figures 1 and 2, it is a single-stage vacuum contactor of the present invention, including an insulating frame 10 and a cover 20 arranged above the insulating frame 10, and a vacuum arc extinguishing system 1, Electromagnetic system 2, transmission pressure system, anti-destructive and dust-proof auxiliary switch (not shown in the figure) and autotransformer rectification energy-saving control module 4, the transmission pressure system includes return force spring 31, overtravel Spring 32, movable ejector rod 34 and anti-closing spring 33, the vacuum arc extinguishing system 1 includes an insulating housing 12, the anti-closing bouncing spring 33 is placed in the insulating housing 12, the autotransformer A transformer (not shown in the figure) is provided in the voltage rectification energy-saving control module 4 to maintain a constant voltage source of 24V. The electromagnetic system 2 includes a coil 21, and the coil 21 is arranged on the outer periphery of the return spring 31. The autotransformer rectification energy-saving control module 4 is connected with the electromagnetic system 2 , and four overtravel ejector rods 5 are arranged between the overtravel spring 32 and the return spring 31 .

An insulating laminate 6 is provided between the return spring 31 and the overtravel spring 32, and the insulating laminate 6 is provided with four through holes (not shown in the figure) for the four overtravel push rods 5 to pass through.

An insulator 7 is provided between the overtravel spring 32 and the movable push rod 34 .

The outer front end of the movable push rod 34 is covered with a guide sleeve 35 , and the end is placed in the insulating casing 12 .

As shown in FIG. 2 , an LED indicator light 23 is provided on the cover 20 , and when the single-stage vacuum contactor works normally, the LED indicator light 23 is always on.

A scale 22 is also provided on the cover 20, and the scale 22 is located above the overtravel spring 32, and can precisely adjust the opening distance and overtravel of the single-stage vacuum contactor.

The return spring 31 , the overtravel spring 32 and the anti-closing spring 33 are all three-stage flexible springs.

As shown in Figure 3, a multi-stage vacuum contactor is composed of two or more single-stage vacuum contactors described above. Since the insulating frame 10 of the single-stage vacuum contactor is an insulating material, two Complete insulation between single-stage vacuum contactors.

As shown in Figure 4, when the coil is powered off, the return spring 31 overcomes the self-closing force of the insulating housing 12 to release the armature, and the overtravel push rod 5 passes through the through hole of the insulating laminate 6, driving the movable push rod 34 to gradually move out of the insulation The housing 12 drives the movable conductive rod 8 to move, so that the movable contact 81 of the movable conductive rod 8 is disconnected from the static contact 91 of the static conductive rod 9 to complete the disconnection of the single-stage vacuum contactor; when the coil is energized, The armature pulls in, and under the action of the self-closing force of the overtravel spring 32 and the insulating case 12, the overtravel ejector rod 5 breaks away from the insulating laminate 6, so that the moving conductive rod 8 moves in the direction of the static conductive rod 9 in the insulating case 12 Finally, the moving contact 81 of the moving conductive rod 8 is brought into contact with the static contact 91 of the static conductive rod 9 to complete the closing of the vacuum contactor. During the operation of this embodiment, the arrangement of the bellows 13 and the shielding cylinder 14 isolates the vacuum state inside the vacuum tube 15 from the outside world, ensuring the arc extinguishing effect of the vacuum arc extinguishing system.

The single-stage vacuum contactor and its multi-stage vacuum contactor of the utility model have high working reliability and long service life, and are suitable for long-distance connection and connection in a power system with AC 50HZ, rated working voltage 1140V, and rated working current 400A. It is used to break the line and frequently start and stop the AC motor; it is also suitable to form a magnetic starter with various protection devices (motor integrator, over-current protection device, resistance-capacity absorption device, etc.), especially suitable to form an explosion-proof magnetic starter.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the scope of protection of the present utility model.

Claims (9)

1. a single stage vacuum contactor, comprise Insulating frame and be located at the cover cap above Insulating frame, it is characterized in that, vacuum extinction system, electromagnetic system, the self coupling Transformer Rectifier energy-saving control module be connected with electromagnetic system, drive train pressure system and the dust-proof auxiliary switch of collapse resistance is provided with in described Insulating frame

Described drive train pressure system comprises the return spring, excess of stroke spring, movable push rod and the anti-closing rebound spring that from left to right arrange successively,

Described vacuum extinction system comprises an insulation shell, and described anti-closing rebound spring is arranged in insulation shell,

A transformer is provided with in described self coupling Transformer Rectifier energy-saving control module,

Described electromagnetic system comprises a coil, and the periphery of return spring is located at by described coil,

Excess of stroke push rod is provided with between described excess of stroke spring and return spring.

2. single stage vacuum contactor as claimed in claim 1, is characterized in that, be provided with insulating laminated plate between described return spring and excess of stroke spring, and insulating laminated plate is provided with the through hole that can pass for excess of stroke push rod.

3. single stage vacuum contactor as claimed in claim 2, it is characterized in that, described excess of stroke push rod is four, and the through hole on insulating laminated plate is four.

4. single stage vacuum contactor as claimed in claim 1, is characterized in that, be provided with an insulator between described excess of stroke spring and movable push rod.

5. single stage vacuum contactor as claimed in claim 4, it is characterized in that, outside the front end of described movable push rod, surface cover has a fairlead, and end is placed in insulation shell.

6. single stage vacuum contactor as claimed in claim 1, it is characterized in that, described cover cap is provided with LED light.

7. single stage vacuum contactor as claimed in claim 1, it is characterized in that, described cover cap is also provided with a scale, and described scale is positioned at the top of excess of stroke spring.

8. single stage vacuum contactor as claimed in claim 1, it is characterized in that, described return spring, excess of stroke spring and anti-closing rebound spring are three grades of flexure springs.

9. a multi-stage vacuum contactor, is characterized in that, is combined by the single stage vacuum contactor described in two or more any one of claim 1-8.