CN204167156U - A kind of on-load switch - Google Patents

Abstract

The utility model discloses a load switch, comprising: a base, a lower wiring seat, an upper wiring seat, a switch knife, a switch knife seat, a main contact, an auxiliary arc contact, a conductive shrapnel, a positioning pin and a spring; On the base; the switch knife is connected to the base through the switch knife seat, and the switch knife seat is located above the lower wiring seat; the main contact is connected to the base, located above the switch knife seat; the auxiliary contact is connected to the terminal through the positioning pin and the conductive shrapnel On the base, it is located above the main contact; the upper terminal block is connected to the base, located above the auxiliary arc contact; one end of the positioning pin passes through the auxiliary arc contact and the conductive shrapnel to connect with the base, and the other end is a free end; On the pin, the diameter of the free end of the positioning pin is greater than the diameter of the spring, and the diameter of the spring is greater than the diameter of the hole through which the positioning pin of the auxiliary contact passes; one end of the conductive shrapnel is connected to the position pin, and the other end is connected to the upper terminal block. The load switch of the utility model has good arc extinguishing effect and enhances the safety of electricity consumption.

Description

a load switch

technical field

The utility model relates to a switch, in particular to a load switch.

Background technique

The open load switch is suitable for AC 50Hz, rated voltage of single-phase 220V, three-phase 380V and below, rated current of 63A and below, as operating switches for lamps, electric heaters, etc., as manual infrequent connection and disconnection of load electrical appliances, It can also be used for the infrequent direct start and stop of the AC induction motor when the capacity is appropriately reduced. The basic structure of the traditional load switch is shown in Figure 1. When the knife switch handle connected to the lower terminal block 1 is turned to the left, an arc is generated between the upper terminal block 4, the static contact 3 and the switch knife, and one side of it is covered by the switch knife. Axially elongated, one side passes through the switch knife to generate a magnetic field force to move upward, further elongating the arc, so that the arc obtains higher volt-ampere characteristics, cooled by air, and the arc is extinguished at the zero crossing point of the arc. However, in the actual use of the switch, because the user does not use it according to the operating conditions required by the manual, such as breaking large currents and frequent operations, although the arc may be extinguished, the long-term operation will cause severe contact ablation, and The extended area of the arc is far away. If special measures are not taken, it may cause phase-to-phase or phase-to-ground short circuit, damage other surrounding equipment, and even cause personal safety accidents.

Under the premise of enterprises pursuing high-efficiency production and maximizing profits, safe electricity use is often neglected, so there is an urgent need for investment in high-safety power-using products.

Utility model content

The utility model aims at the problems existing in the above-mentioned prior art, and proposes a load switch, which includes a pair of auxiliary arc contacts, which has a good arc extinguishing effect, enhances the safety of electricity consumption, and solves the problem of safety in the existing load switch. Not a high question.

In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:

The utility model provides a load switch, which includes: a base, a lower wiring seat, an upper wiring seat, a switch knife, a switch knife seat, a main contact, an auxiliary arc contact, a conductive shrapnel, a positioning pin and a spring, wherein: the The lower wiring seat is connected to the base; the knife knife is connected to the base through the rotation of the knife knife seat, and the knife knife seat is located above the lower wiring seat; the main contact is connected to the The base is located above the knife seat; the auxiliary arc contact is connected to the base through the positioning pin and the conductive shrapnel and is located above the main contact; the upper terminal block Connected to the base and located above the auxiliary contact; one end of the positioning pin passes through the auxiliary arc contact and the conductive shrapnel and is connected to the base, and the other end is a free end; the spring sleeve On the locating pin, the diameter of the free end of the locating pin is greater than the diameter of the spring and the diameter of the spring is greater than the diameter of the hole through which the locating pin on the auxiliary arc contact passes; one end of the conductive shrapnel It is connected with the position pin, and the other end is connected with the upper terminal block.

When the load switch is opened, the auxiliary arcing contact moves along with the switch knife, and the auxiliary arcing contact moves along the positioning pin, compressing the spring to store energy, because the diameter of the free end of the positioning pin is larger than the diameter of the spring and the diameter of the spring is larger than The diameter of the hole where the auxiliary arcing contact passes through the positioning pin. Therefore, when the auxiliary arcing contact moves here, under the action of the positioning pin and the spring, the auxiliary arcing contact is separated from the switch blade, and the auxiliary arcing contact is in the Under the action of the spring, it rebounds quickly, the arc is elongated instantly, cooled by air, and the AC arc is extinguished at zero crossing point. In this way, rapid non-human operation of arc extinguishing is realized, and the effect of arc extinguishing is improved.

The utility model adds an auxiliary arc contact, which is a movable arc contact, without a special arc extinguishing chamber, which enhances the arc extinguishing effect, thereby effectively protecting the main contact and prolonging the service life of the load switch.

Preferably, the center positions of the lower wire base, the knife blade base, the main contacts, the auxiliary contacts and the upper wire base are located on a straight line.

Preferably, the load switch includes three positioning pins, the positioning pins are vertically arranged along the straight line, the spring is sleeved on the positioning pin in the middle, and the auxiliary arc contact can be held by using three positioning pins Excellent motion stability, continuous opening and closing will not deviate from the original position.

Preferably, along a direction perpendicular to the base, the length of the auxiliary arcing contact is greater than that of the main contact. When the switch is closed, the auxiliary arc contact is closed first, which bears the electrical wear of the switch, effectively protects the main contact and prolongs the service life of the main contact.

Preferably, the part of the auxiliary arcing contact perpendicular to the base is in the shape of a horn. When the switch is opened, when the auxiliary arcing contact is separated from the switch knife, the magnetic field generated by the current flowing through the conductive loop is along the vertical and The arc is elongated in the direction of the arc axis, because the elongation of the arc in the normal direction not only increases the length of the arc, but also causes the arc to move laterally along the horn direction, and the arc extinguishing effect is better.

Preferably, the auxiliary arc contact is made of copper-chromium alloy, which is harmless to the human body and is an environmentally friendly material with good electrical and thermal conductivity, high hardness, wear resistance and explosion resistance, and good uprightness. The use of this material can increase the service life of the load switch, ensure long-term operation, and still maintain good performance.

Preferably, there is a bent part in the middle of the conductive elastic piece, which can ensure the elastic force of the conductive elastic piece and enable the conductive elastic piece to move within a wide range.

Preferably, the bent portion is bent in a semicircle to increase the elastic force of the conductive elastic piece.

Compared with the prior art, the utility model has the following advantages:

The load switch provided by the utility model adds an auxiliary arc contact, which can realize arc extinguishing by non-human operation, and effectively solves the problems of poor arc extinguishing ability of the traditional switch and easy ablation of the main contact, thereby effectively protecting the working contact and increasing The service life of the contacts of the load switch is extended, the safety performance is increased, and the cost of safety production is reduced.

Description of drawings

Below in conjunction with accompanying drawing, the embodiment of the present utility model is further described:

Fig. 1 is the structural representation of existing load switch;

Fig. 2 is the structural representation of load switch of the present utility model;

Fig. 3 is a front view of the contact part of Fig. 2;

Fig. 4 is a right view of the contact portion of Fig. 2;

FIG. 5 is a top view of the contact portion of FIG. 2 .

Label description: 1-base, 2-lower wiring seat, 3-switch blade, 4-switch knife seat, 5-main contact, 6-upper wiring seat, 7-auxiliary arc contact, 8-conductive shrapnel, 9- Locating pin, 10-spring.

Detailed ways

The following is a detailed description of the embodiments of the present utility model. This embodiment is implemented on the premise of the technical solution of the present utility model, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present utility model is not limited to the following the described embodiment.

The load switch of the present utility model comprises: a base 1, a lower wiring seat 2, an upper wiring seat 6, a switch knife 3, a switch knife seat 4, a main contact 5, an auxiliary arc contact 7, a conductive shrapnel 8, a positioning pin 9 and a spring 10, wherein: the lower wiring seat 2 is connected to the base 1; the switch blade 3 is connected to the base 1 through the rotation of the switch knife seat 4, and the switch knife seat 4 is located above the lower wiring seat 2; the main contact 5 is connected to the base 1 , located above the knife seat 4; the auxiliary arc contact 7 is connected to the base 1 through the positioning pin 9 and the conductive shrapnel 8, and is located above the main contact 5; the upper terminal block 6 is connected to the base 1, located on the auxiliary arc contact Above the head 7; one end of the positioning pin 9 is connected to the base 1 through the auxiliary arc contact 7 and the conductive shrapnel, and the other end is a free end; the spring 10 is set on the positioning pin 9, and the diameter of the free end of the positioning pin 9 is larger than that of the spring 10 diameter, and the diameter of the spring 10 is greater than the diameter of the hole through which the positioning pin 9 on the auxiliary arc contact 7 passes;

In this embodiment, in the direction shown in Figure 2, the upper terminal block 6, the auxiliary arc contact 7, the main contact 5, the switch blade seat 4, and the lower terminal block 2 are arranged on the base 1 from top to bottom. The center position is a straight line.

In this embodiment, three positioning pins 9 are provided, and the three positioning pins 9 are vertically arranged along the above-mentioned straight line. The spring 10 is set on the middle positioning pin. The elasticity of the shrapnel 8 enables it to move within a relatively large range.

In this embodiment, along the direction perpendicular to the base 1, the length of the auxiliary arc contact 7 is greater than the length of the main contact 5. When the switch is closed, the switch blade 3 is rotated to move to the left, and the switch blade 3 first contacts the auxiliary arc contact. 7. The auxiliary arc contact 7 is closed first, which bears the electrical wear during closing, effectively protects the main contact 5, and prolongs the life of the load switch. When the switch knife 3 moves to the left to the limit, the auxiliary arc contact 7 and The conductive shrapnel contacts and is connected to the upper terminal block 6 through the conductive shrapnel 8 . When opening the gate, turn the switch knife 3 to move to the right, and the auxiliary arc contact 7 moves to the right together with the switch knife 3, the main contact short-circuits first, and the auxiliary arc contact 7 compresses the spring 10 to store energy. The positioning pin 9 covered with the spring 10 restricts the movement of the spring 10 and the auxiliary arc contact 7. Therefore, when the auxiliary arc contact 7 moves to the limit, it is separated from the switch blade 3, and at the moment of separation, under the action of the spring 10, The auxiliary arc contact 7 springs back quickly, the arc is elongated instantly, cooled by air, and the arc is extinguished at the zero crossing point of the AC arc. In this way, rapid non-manpower operation of arc extinguishing is realized, and the effect of arc extinguishing is improved.

In a preferred embodiment, the part of the auxiliary arcing contact 7 along the direction perpendicular to the base 1 can be set in the shape of a horn. When the switch is opened, when the auxiliary arcing contact is separated from the switch knife, the magnetic field generated by the current flowing through the conductive circuit is along the The arc is elongated vertically and along the direction of the arc axis, and the length of the arc is increased due to the elongation of the arc in the normal direction, and the arc produces a lateral movement along the horn direction, which further enhances the arc extinguishing effect.

In a preferred embodiment, the auxiliary arc contact 7 is made of copper-chromium alloy, which is harmless to the human body and is an environmentally friendly material with good electrical and thermal conductivity, high hardness, wear resistance and explosion resistance, and good uprightness. This material can ensure good opening and closing performance during frequent operations, prolonging the service life of the load switch.

What is disclosed here is only the preferred embodiment of the utility model. This specification selects and describes these embodiments in detail to better explain the principle and practical application of the utility model, not to limit the utility model. Any modifications and changes made by those skilled in the art within the scope of the description shall fall within the protection scope of the present utility model.

Claims (8)

1. A load switch, characterized in that it comprises: a base, a lower wiring seat, an upper wiring seat, a switch knife, a switch knife seat, a main contact, an auxiliary arc contact, a conductive shrapnel, a positioning pin and a spring, wherein: The lower terminal block is connected to the base; The knife is rotatably connected to the base through the knife seat, and the knife seat is located above the lower wiring seat; The main contact is connected to the base and located above the knife seat; The auxiliary arcing contact is connected to the base through the positioning pin and the conductive shrapnel, and is located above the main contact; The upper wire seat is connected to the base and is located above the auxiliary arcing contact; One end of the positioning pin is connected to the base through the auxiliary arcing contact and the conductive shrapnel, and the other end is a free end; The spring is sleeved on the positioning pin, the diameter of the free end of the positioning pin is larger than the diameter of the spring, and the diameter of the spring is larger than the diameter of the hole through which the positioning pin on the auxiliary arc contact passes; One end of the conductive elastic piece is connected to the position pin, and the other end is connected to the upper terminal block. 2. The load switch according to claim 1, wherein the center positions of the lower wire seat, the knife seat, the main contact, the auxiliary arc contact and the upper wire seat are located at on a straight line. 3. The load switch according to claim 2, characterized in that it comprises three positioning pins, the positioning pins are arranged vertically along the straight line, and the spring is sleeved on the positioning pin located in the middle. 4. The load switch according to claim 1, characterized in that, along a direction perpendicular to the base, the length of the auxiliary arcing contact is greater than the length of the main contact. 5. The load switch according to claim 1, characterized in that, the part of the auxiliary arcing contact perpendicular to the base is in the shape of a horn. 6. The load switch according to claim 1, characterized in that, the material of the auxiliary arcing contact is copper-chromium alloy. 7. The load switch according to claim 1, wherein there is a bent part in the middle of the conductive elastic piece. 8. The load switch according to claim 7, wherein the bent portion is a semicircular bend.