Vacuum Arc-extinguishing Chamber Used for Contactors and Contactor

Field of the Utility Model

The utility model relates to the mechanical field, and in particular, to a vacuum arc-extinguishing chamber used for contactors. In addition, the utility model relates to a contactor that uses the vacuum arc-extinguishing chamber.

Background of the Utility Model

A contactor refers to an electric appliance that makes its contacts closed after current flows through the coil to generate a magnetic field in industrial power supply so as to control the load. The working principle of a contactor is: after the coil of a contactor is powered on, current on the coil generates a magnetic field, which makes a static contact component produce electromagnetic attraction, attracts a dynamic contact component and drives contacts to move. If the contactor is always turned off, the contacts are disconnected; or if the contactor is always turned on, the contacts are closed. When the two contact components are separated, an electric arc is generated between them.

In an actual operation, when current increases to a limit, electric arc aggregates and ablates contact blades in the contact components. Excessive ablation will damage the contact blades and decrease the service life of the contactor.

Summary of the Utility Model

For this reason, the utility model proposes a vacuum arc- extinguishing chamber used for contactors and a contactor to try to avoid aggregation of an electric arc. In one aspect, the utility model provides a vacuum arc extinguishing chamber used for contactors, comprising two contact components, each of the contact components including a contact rod and a contact blade, the contact blade being located at one end of the contact rod, and the two contact blades being set to face each other, characterized in that each of the contact components further includes a horseshoe shaped metal plate, which has one opening and receives the contact rod, the horseshoe- shaped metal plate and the contact rod being fixed on the same side of the contact blade; wherein the openings of the two horseshoe-shaped metal plates extend in opposite directions.

According to the utility model, after a horseshoe-shaped metal plate is added to each contact component of the contactor to generate an additional electromagnetic field, excessive ablation due to aggregation of electric arc on the contact surface can be avoided so that the service life of the contactor can be ensured. This method features a simple technique and a low cost.

According to the vacuum arc-extinguishing chamber, optionally, the horseshoe- shaped metal plate is a pure horseshoe-shaped electric iron plate. The technique for making pure electric iron plates is well established. The performance of pure electric iron plates is high, and their price is low.

According to the vacuum arc-extinguishing chamber, optionally, the outer diameter of the horseshoe-shaped metal plate is smaller than or equal to the outer diameter of the contact blade .

According to the vacuum arc-extinguishing chamber, optionally, inner sides of the opening contact the contact rod. In this way, the magnetic field generated by the two horseshoe-shaped metal plates can cover the contact blade.

According to the vacuum arc-extinguishing chamber, optionally, the horseshoe-shaped metal plate is connected to the contact blade through welding. The technique of welding is simple and reliable .

According to the vacuum arc-extinguishing chamber, optionally, the contact rod has two recess parts and the horseshoe-shaped metal plate receives the recess part. Two symmetrical recess parts are set on a contact rod so that the opening of a horseshoe-shaped metal plate can receive a contact rod to make assembly easier.

According to the vacuum arc-extinguishing chamber, optionally, the contact blade is round, the contact rod is cylindrical, and the diameter of the contact blade is greater than the diameter of the contact rod. In this way, point discharge is less likely to occur on the contact components, materials can be saved, and the cost can be reduced.

According to the vacuum arc-extinguishing chamber, optionally, the contact blade is a tungsten carbide silver plate or a tungsten copper plate.

In another aspect, the utility model provides a contactor, which includes any of the vacuum arc-extinguishing chamber described in the above. After a horseshoe-shaped metal plate is added to each contact component of the contactor to generate an additional electromagnetic field, excessive ablation due to aggregation of an electric arc on the contact surface can be avoided so that the service life of the contactor can be ensured. This method features a simple technique and a low cost .

Brief Description of Drawings

The following describes preferred embodiments of the utility model by referring to attached drawings to make persons of ordinary skill in the art clearer about the preceding and other features and advantages of the utility model. In the drawings : Figure 1 is a structural diagram showing the state when the two contact blades of a contact component according to an embodiment of the utility model are separated;

Figure 2 is a structural diagram showing the state when the two contact blades of a contact component according to an embodiment of the utility model are connected; and

Figure 3 is a structural diagram of a horseshoe-shaped metal plate according to an embodiment of the utility model.

In the figures :

101 refers to a contact rod in a static contact component. 1011 refers to a recess part of the contact rod in the static contact component.

102 refers to a contact blade in the static contact component.

103 refers to a contact rod in a dynamic contact component. 1031 refers to a recess part of the contact rod in the dynamic contact component.

104 refers to a contact blade in the dynamic contact component.

105 refers to a horseshoe-shaped metal plate in the static contact component.

1051 refers to an inner side of an opening.

106 refers to a horseshoe-shaped metal plate in the dynamic contact component.

110 refers to an opening.

Detailed Description of the Embodiments

To make the purpose, technical solution and advantages of the utility model clearer, the following further describes the utility model in detail by using embodiments:

An embodiment of the utility model provides a vacuum arc extinguishing chamber used for contactors. The vacuum arc extinguishing chamber includes two contact components, which are a dynamic contact component and a static contact component. The static contact component includes a contact rod 101 and a contact blade 102, and the contact blade 102 is located at one end of the contact rod 101. The dynamic contact component includes a contact rod 103 and a contact blade 104. The dynamic contact component may move up and down to be connected with or separated from the static contact component. The contact blade 102 and the contact blade 104 are set to face each other. The contact blade 104 may move up and down with the contact rod 103 and thus is connected with or separated from the contact blade 102 to turn on or turn off the contactor.

In this embodiment, each of the contact components further includes a horseshoe- shaped metal plate. The horseshoe-shaped metal plate can be welded to a contact blade. The technique of welding is simple and reliable. The horseshoe- shaped metal plate has an opening, which matches with the contact blade. As shown in Figure 1 and Figure 2, the static contact component includes a horseshoe-shaped metal plate 105, which has an opening and receives the contact rod 101 through the opening. The horseshoe- shaped metal plate 105 and the contact rod 101 are fixed on the same side of the contact blade 102. Accordingly, the dynamic contact component includes a horseshoe-shaped metal plate 106, which also has an opening and receives the contact rod 103 through the opening. The horseshoe-shaped metal plate 106 and the contact rod 103 are fixed on the same side of the contact blade 104.

In this embodiment, the openings of the two horseshoe-shaped metal plates extend in opposite directions, that is, the extension direction of the opening of the horseshoe- shaped metal plate 105 is opposite to the extension direction of the opening of the horseshoe-shaped metal plate 106. In this way, the electromagnetic field formed between the two horseshoe shaped metal plates 105 is in a vertical direction, that is, it is vertical to the two horseshoe-shaped metal plates. The electromagnetic field can avoid aggregation of electric arc generated when the two contact blades are separated. According to the utility model, after a horseshoe-shaped metal plate is added to each contact component of the contactor to generate additional electromagnetic field in an area corresponding to the horseshoe-shaped metal plate, the additional electromagnetic field can avoid ablation to the contact blades due to aggregation of electric arc so that the service life of the contactor can be ensured. This method features a simple technique and a low cost.

Optionally, the horseshoe- shaped metal plate in this embodiment is a pure horseshoe- shaped electric iron plate. The technique for making pure electric iron plates is well established. The performance of pure electric iron plates is high, and their price is low.

Optionally, in this embodiment, the outer diameter of the horseshoe-shaped metal plate is smaller than or equal to the outer diameter of the contact blade. As shown in Figure 1 and Figure 2, the outer diameter of the horseshoe-shaped metal plate 105 is smaller than or equal to the outer diameter of the contact blade 102, and the outer diameter of the horseshoe shaped metal plate 106 is smaller than or equal to the outer diameter of the contact blade 104. In this way, the horseshoe shaped metal plate can be conveniently installed on the contact blades and materials will not be excessively wasted. Optionally, the inner sides of the opening contact the contact rod. As shown in Figure 1 and Figure 2, the inner side of the opening of the horseshoe-shaped metal plate 105 contacts the contact rod 101 and the inner side of the opening of the horse shaped metal plate 106 contacts the contact rod 103 so that a magnetic field can be generated in a scope covered by the contact blades. In actual production, the inner side of the opening of the horseshoe- shaped metal plate can be selected to contact the contact rod and the outline of the horseshoe shaped metal plate is the same as the outline of the contact blade. In this circumstance, the scope of the magnetic field generated between the two horseshoe- shaped metal plates is the largest. Of course, a certain gap may be allowed between inner side of the opening and the contact rod. The gap may be specifically set depending on actual requirements and is not limited in the utility model.

Optionally, in this embodiment, each contact rod has two symmetrical recess parts and the horseshoe-shaped metal plate receives the recess parts. As shown in Figure 1 and Figure 2, the contact rod 101 has two recess parts 1011 (one recess part 1011 is shown in the figures) and the horseshoe-shaped metal plate 105 receives the recess 1011. As shown in Figure 3, an inner side 1051 of the opening 110 faces the recess part 1011, for example, contacting the recess part 1011. The contact rod 103 has two recess parts 1031 (one recess part 1031 is shown in the figures), and the horseshoe- shaped metal plate 106 receives the recess part 1031. Two symmetrical recess parts are set on a contact rod so that the opening of a horseshoe shaped metal plate can receive a contact rod to make assembly easier .

Optionally, in this embodiment, the contact blade is round, the contact rod is cylindrical, and the diameter of the contact blade is larger than the diameter of the contact rod. Because the contact blade is round and the contact rod is cylindrical, point discharge is less likely to occur on the contact blade and contact rod. Because the diameter of the contact blade is larger than the diameter of the contact rod, materials for the contact rods can be saved and the cost can be reduced. In this embodiment, the contact blade may be a tungsten carbide silver plate or a tungsten copper plate.

The utility model further provides a vacuum arc-extinguishing chamber that includes the contact described in the above. According to the utility model, after a horseshoe-shaped metal plate is added to each contact component of the contactor to generate an additional electromagnetic field, excessive ablation due to aggregation of electric arc on the contact surface can be avoided so that the service life of the contactor can be ensured. This method features a simple technique and a low cost.

Embodiments of the utility model described in the above are not intended to limit the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the utility model are all included in the protection scope of the utility model.