CN214753575U

CN214753575U - Arc extinguish chamber of direct current contactor and direct current contactor

Info

Publication number: CN214753575U
Application number: CN202121458998.1U
Authority: CN
Inventors: 郭泽; 李生爱; 李淑琴; 张峰; 李奎
Original assignee: Hebei University of Technology; Shanghai Liangxin Electrical Co Ltd
Current assignee: Hebei University of Technology; Shanghai Liangxin Electrical Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-11-16
Anticipated expiration: 2031-06-29

Abstract

This specification embodiment provides a dc contactor's explosion chamber and dc contactor, and wherein, dc contactor's explosion chamber includes: the moving contact and the static contact are arranged inside the arc extinguish chamber, and the static contact is arranged above the moving contact; the moving contact comprises a middle part and a wing part, the middle part is connected with the outer part of the arc extinguish chamber through a connecting piece, the wing part comprises a left wing and a right wing, and the edges of the left wing and the right wing are both provided with a notch so as to increase the contact area with the electric arc; the quantity of magnet is 4, sets up respectively around the explosion chamber for produce the magnetic field, attract electric arc to the both sides motion of explosion chamber. The arc extinguishing chamber of the direct current contactor provided by the embodiment of the specification can realize quick arc extinguishing, and the service life of the arc extinguishing chamber is prolonged. The direct current contact provided by the embodiment of the specification applies the arc extinguishing chamber.

Description

Arc extinguish chamber of direct current contactor and direct current contactor

Technical Field

The application relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguish chamber of a direct current contactor and the direct current contactor.

Background

The direct current contactor refers to a contactor with an iron core controlled by direct current. Because the attraction coil of the direct current contactor is electrified with direct current, no impact starting current exists, and the direct current contactor is suitable for occasions of frequent starting and stopping.

The economy in the world is rapidly developed, the development of a direct current power supply and distribution system is also changing day by day, and the application field is continuously expanded. With the wide application of the direct current power supply system in the fields of electric vehicles, ships, aviation, rail transit and the like, the usage amount of the direct current contactor is increased day by day.

The division bar devices are mostly designed in the existing contactor arc extinguishing chamber, and the arc extinguishing effect is poor because the moving path of the electric arc cannot be changed enough.

Disclosure of Invention

The embodiment of the specification provides an arc extinguish chamber of a direct current contactor and the direct current contactor, so that the aim of quickly extinguishing arcs in the direct current contactor is fulfilled.

In order to solve the above technical problem, the embodiments of the present specification are implemented as follows:

the embodiment of this description provides an explosion chamber of direct current contactor, includes:

the moving contact and the static contact are arranged inside the arc extinguish chamber, and the static contact is arranged above the moving contact; the moving contact comprises a middle part and a wing part, the middle part is connected with the outer part of the arc extinguish chamber through a connecting piece, the wing part comprises a left wing and a right wing, and the edges of the left wing and the right wing are both provided with a notch so as to increase the contact area with the electric arc; the quantity of magnet is 4, sets up respectively around the explosion chamber for produce the magnetic field, attract electric arc to the both sides motion of explosion chamber.

Optionally, the shape of the notch is one of a rectangle, a trapezoid or a triangle.

Optionally, the thickness of the left wing and the right wing is 2 mm to 4 mm.

Optionally, when the shape of the notch is rectangular, the length of the notch is 3-5 mm, and the width of the notch is 1-2 mm.

Optionally, when the notch is triangular, the angle of the vertex angle of the triangle is 30-85 degrees.

Optionally, when the notch is trapezoidal, the length difference between the upper bottom and the lower bottom of the trapezoid is 1 mm to 2 mm.

The embodiment of this description provides a direct current contactor, includes: an electromagnetic system and an arc extinguishing system; the arc extinguishing system is used for extinguishing electric arcs generated when the moving contact and the static contact are broken; the arc extinguishing system comprises an arc extinguishing chamber of the direct current contactor.

The embodiment of the specification adopts at least one technical scheme which can achieve the following beneficial effects:

the utility model provides a DC contactor's explosion chamber sets up the breach through the left wing and the right wing at the moving contact, changes the motion route of electric arc to the breach department of moving contact has increased the area of contact with electric arc, shortens the arcing time.

Drawings

Fig. 1 is a schematic installation diagram of an arc extinguishing chamber of a dc contactor provided in an embodiment of the present disclosure;

fig. 2 to fig. 4 are schematic structural diagrams of the movable contact provided in the embodiment of the present disclosure.

Reference numerals:

10-moving contact, 101-middle part, -wing part, 102-left wing, 103-right wing, 104-gap and 30-static contact.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments of the present disclosure, shall fall within the scope of protection of the present application.

The direct current contactor refers to a contactor with an iron core controlled by direct current. The contact of the direct current contactor is divided into a fixed contact 30 and a moving contact 10, when the coil of the direct current contactor is electrified, the moving contact 10 is closed by the attraction of the electromagnetic coil, and forms a closed loop after contacting with the fixed contact 30, so that the switching-on operation is completed. At this time, the solenoid is still energized and the contacts remain closed. When the electromagnetic coil is powered off, the opening spring acts on the moving contact 10 to form upward elastic force, the moving contact 10 starts to separate from the static contact 30, the moving contact 10 reaches a rated opening distance after reaching the limiting plate, and the opening and closing process is finished.

When the direct current contactor breaks a circuit, when the breaking current exceeds a threshold value, electric arcs can be generated between contacts. The generation of the arc provides an important channel for the release of energy in the loop, but the arc can prolong the on-off time of the circuit, burn the contact to reduce the service life of the electric appliance, and in severe cases, the electric switch can be burnt out to cause the on-off failure.

The prior parting strip device in the arc extinguishing chamber of the contactor has poor arc extinguishing effect because the moving path of electric arc cannot be changed enough.

In view of the above technical problem, an embodiment of the present disclosure provides an arc extinguish chamber of a dc contactor, as shown in fig. 1, the arc extinguish chamber of the dc contactor includes: the arc extinguishing chamber comprises a moving contact 10, a pair of fixed contacts 30 and a magnet, wherein the moving contact 10 and the fixed contacts 30 are arranged inside the arc extinguishing chamber, and the fixed contacts 30 are arranged above the moving contact 10; the moving contact 10 comprises a middle part 101 and a wing part, the middle part 101 is connected with the outside of the arc extinguish chamber through a connecting piece, the wing part comprises a left wing 102 and a right wing 103, and the edges of the left wing 102 and the right wing 103 are both provided with a notch 104 so as to increase the contact area with the electric arc; the quantity of magnet is 4, sets up respectively around the explosion chamber for produce the magnetic field, attract electric arc to the both sides motion of explosion chamber.

The middle part 101 of the moving contact 10 is connected with a spring outside the arc extinguishing chamber through a connecting rod, and is close to or far away from the static contact 30 through the deformation of the spring and the relay.

In order to increase the contact area between the movable contact 10 and the arc, a gap 104 is formed in the wing portion of the movable contact 10, when the arc is generated between the movable contact 10 and the stationary contact 30, the arc is attracted to two sides of the arc extinguish chamber due to the action of the magnet, and when the gap 104 of the wing portion is touched, the movement path of the arc is forced to change, so that the arc is pulled. On the other hand, the notch 104 is formed in the movable contact 10, so that the contact area between the electric arc and the movable contact 10 is increased, and the extinguishing of the electric arc is accelerated.

In practical applications, notches 104 are symmetrically formed at the edges of the left wing 102 and the right wing 103 of the movable contact 10, as shown in fig. 2, 3 and 4, the shape of the notches 104 may be a regular shape, for example: rectangular, trapezoidal, or triangular; the shape of the notch 104 may also be irregular, and any shape of the notch 104 that increases the contact area with the arc may be used in the embodiments of the present disclosure, and the embodiments of the present disclosure are not limited.

The size of the notch 104 provided in the embodiments of the present specification is related to the current that the dc contactor can bear, and the larger the current that the dc contactor bears, the larger the notch 104 is; the smaller the current that the dc contactor is subjected to, the smaller the gap 104.

In this embodiment, the external magnetic field is provided by the magnets arranged outside the arc extinguish chamber, and the magnets are uniformly distributed around the arc extinguish chamber. Under the action of the magnet, the electric arc moves to two sides of the arc extinguish chamber, when the electric arc contacts the notch 104, the moving path of the electric arc is changed, the change of the voltage and the current of the electric arc is accelerated, and the electric arc is quickly extinguished.

The moving contact 10 is made of a high temperature resistant material with a certain thickness, such as: ceramic, which is able to withstand the high temperatures of the arc and is not broken down by the arc. It should be understood that the wing portion may also be made of other high temperature resistant materials, such as: silicon dioxide. The thickness of the wing part is 2 mm-4 mm. In this embodiment, the thickness of the wing portion is 3 mm.

As shown in fig. 2, when the notch 104 is rectangular, the length of the notch 104 is 3 to 5 mm, and the width thereof is 1 to 2 mm. In this embodiment, the notch 104 has a length of 4 mm and a width of 1.5 mm.

As shown in fig. 3, when the notch 104 has a triangular shape, the angle of the vertex of the triangular shape is 30 to 85 degrees. In this embodiment, the top angle of the notch 104 is 60 degrees.

As shown in fig. 4, when the notch 104 is trapezoidal, the length difference between the upper bottom and the lower bottom of the trapezoid is 1 mm to 2 mm. In this embodiment, the difference between the lengths of the upper and lower bottoms of the notch 104 is 1.5 mm.

An embodiment of the present specification further provides a direct current contactor, including: an electromagnetic system and an arc extinguishing system; the electromagnetic system is used for providing a suction force and a breaking force for the moving contact 10 and the static contact 30, and the arc extinguishing system is used for extinguishing an electric arc generated when the moving contact 10 and the static contact 30 are broken; the arc extinguishing system comprises an arc extinguishing chamber of the direct current contactor.

While certain embodiments of the present disclosure have been described above, other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily have to be in the particular order shown or in sequential order to achieve desirable results. The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above description is only an example of the present specification, and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An explosion chamber of a direct current contactor, comprising: the arc extinguishing chamber comprises a moving contact (10), a pair of fixed contacts (30) and a magnet, wherein the moving contact (10) and the fixed contacts (30) are arranged inside the arc extinguishing chamber, and the fixed contacts (30) are arranged above the moving contact (10); the moving contact (10) comprises a middle part (101) and a wing part, the middle part (101) is connected with the outer part of the arc extinguish chamber through a connecting piece, the wing part comprises a left wing (102) and a right wing (103), and the edges of the left wing (102) and the right wing (103) are respectively provided with a notch (104) so as to increase the contact area with electric arcs; the quantity of magnet is 4, sets up respectively around the explosion chamber for produce the magnetic field, attract electric arc to the both sides motion of explosion chamber.

2. Arc chute of a direct current contactor according to claim 1, characterized in that the shape of the gap (104) is one of rectangular, trapezoidal or triangular.

3. The arc extinguishing chamber of a direct current contactor according to claim 2, characterized in that the thickness of the left wing (102) and the right wing (103) is between 2 mm and 4 mm.

4. The arc extinguish chamber of the direct current contactor according to claim 3, wherein when the notch (104) is rectangular, the length of the notch (104) is 3-5 mm, and the width of the notch is 1-2 mm.

5. Arc chute of a dc contactor according to claim 3, characterized in that when the shape of said gap (104) is triangular, the angle of the apex angle of said triangle is 30-85 degrees.

6. The arc extinguish chamber of a direct current contactor according to claim 3, wherein when the shape of the notch (104) is trapezoid, the length difference between the upper bottom and the lower bottom of the trapezoid is 1 mm-2 mm.

7. A DC contactor, comprising: an electromagnetic system and an arc extinguishing system; the arc extinguishing system is used for extinguishing electric arcs generated when the moving contact (10) and the static contact (30) are disconnected;

wherein the arc extinguishing system comprises the arc extinguishing chamber of the direct current contactor of any one of claims 1 to 6.