Contact cavity structure of direct current contactor

Abstract

A contact cavity structure of a direct current contactor comprises a cavity, the upper surface of the cavity is provided with two mounting holes used for mounting a pair of static contacts, the inner cavity of the cavity is uniformly provided with a plurality of parallel ceramic ribs along the inner side wall, and the ceramic ribs are parallel to the axes of the static contacts. According to the utility model, the defects in the prior art are overcome, and the plurality of parallel ceramic ribs are arranged, so that electric arcs can be lengthened and snapped through the matching effect of the adjacent ceramic ribs and the rib grooves between the adjacent ceramic ribs, and the purpose of improving the arc extinguishing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of DC contactors, in particular to a contact cavity structure of a DC contactor. Background Art

[0002] The DC contactor is generally composed of an iron core, a coil, an armature, a contact spring, etc. As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, thereby generating an electromagnetic effect. The armature will overcome the pulling force of the return spring under the action of electromagnetic attraction and be attracted to the iron core, thereby driving the moving contact of the armature to close with the static contact. When the coil is powered off, the electromagnetic attraction also disappears, and the armature will return to its original position under the reaction force of the spring, disconnecting the moving contact from the original static contact. In this way, the attraction and release achieve the purpose of conduction and disconnection in the circuit.

[0003] The contact cavity of the existing DC contactor usually adopts a square or circular cavity structure, and there is no partition on the inner wall of the contact cavity. Therefore, as the number of times the product is used increases, arc cooling will contaminate the entire contact cavity, resulting in a significant decrease in the insulation withstand voltage performance between the contacts. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a contact cavity structure of a DC contactor, which overcomes the deficiencies of the prior art and has a reasonable design. By arranging a plurality of mutually parallel ceramic ribs, the arc can be elongated and broken through the cooperation of adjacent ceramic ribs and the rib grooves therebetween, thereby improving the arc extinguishing effect.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A contact cavity structure of a DC contactor comprises a cavity, wherein the upper surface of the cavity is provided with two mounting holes for mounting a pair of stationary contacts, and the inner cavity of the cavity is evenly provided with a plurality of mutually parallel ceramic ribs along the inner side wall, wherein the ceramic ribs are arranged parallel to the axis of the stationary contact.

[0007] Preferably, the ceramic ribs and the cavity are integrally formed of ceramic.

[0008] Preferably, magnet mounting grooves are provided on both the left and right sides of the cavity, and the magnet mounting grooves are respectively located on the sides of the two static contacts that are away from each other, and the magnet mounting grooves are used to install and place permanent magnets.

[0009] Preferably, a mounting cover is installed in the middle of the inner cavity of the cavity, and a magnetizing block is provided in the inner cavity of the mounting cover.

[0010] Preferably, a snap-in hole is provided in the middle of the upper surface of the cavity, and a buckle is provided on the upper surface of the mounting cover, and the buckle is matched with the snap-in hole to be snap-fitted and fixed.

[0011] Preferably, the ceramic ribs located on two opposite side walls of the cavity are symmetrically arranged.

[0012] The utility model provides a contact cavity structure of a DC contactor. It has the following beneficial effects: by arranging a plurality of mutually parallel ceramic ribs in the inner cavity of the cavity, each ceramic rib faces the arc blowing direction of the arc, so that the arc can be elongated and broken by the cooperation of the adjacent ceramic ribs and the rib grooves therebetween, thereby improving the arc extinguishing effect. In addition, the ceramic ribs can also be used to limit the mounting clamp of the moving contact, thereby effectively preventing the contact clamp of the moving contact from being skewed during movement, and ensuring smooth movement of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings required for describing the prior art are briefly introduced below.

[0014] Figure 1 The structure of the utility model Figure 1 ;

[0015] Figure 2 The structure of the utility model Figure 2 ;

[0016] Figure 3 Bottom view of the cavity in the utility model;

[0017] Description of the numbers in the figure:

[0018] 1. Cavity; 2. Mounting hole; 3. Ceramic rib; 4. Magnet mounting slot; 5. Mounting cover; 7. Snap-on hole; 8. Buckle. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0020] Embodiment 1, as Figure 1-3 As shown, a contact cavity structure of a DC contactor includes a cavity 1, two mounting holes 2 for mounting a pair of stationary contacts are opened on the upper surface of the cavity 1, and a plurality of parallel ceramic ribs 3 are evenly arranged along the inner wall of the cavity 1, and the ceramic ribs 3 are arranged parallel to the axis of the stationary contact. Among them, the ceramic ribs 3 and the cavity 1 are both integrally formed of ceramic. The ceramic ribs 3 located on the opposite side walls of the cavity 1 are symmetrically arranged.

[0021] Working principle:

[0022] During use, a plurality of ceramic ribs 3 parallel to each other are arranged in the inner cavity of the cavity 1, so that each ceramic rib 3 faces the arc blowing direction of the arc, so that the arc can be elongated and broken through the cooperation of adjacent ceramic ribs 3 and the rib grooves therebetween, thereby improving the arc extinguishing effect.

[0023] Furthermore, the ceramic ribs 3 can also be used to limit the mounting clamp of the moving contact, thereby effectively preventing the contact clamp of the moving contact from being skewed during movement, thereby ensuring smooth movement of the product.

[0024] Embodiment 2, as a further preferred embodiment of embodiment 1, magnet mounting grooves 4 are provided on both sides of the cavity 1, and the magnet mounting grooves 4 are respectively located on the sides away from each other of the two static contacts, and permanent magnets are installed in the magnet mounting grooves 4. By providing the magnet mounting grooves 4 on the left and right sides of the cavity 1, permanent magnets can be directly installed in the magnet mounting grooves 4.

[0025] Embodiment 3, as a further preferred solution of embodiment 1, a mounting cover 5 is installed in the middle of the inner cavity of the cavity 1, and a magnetizing block is arranged in the inner cavity of the mounting cover 5. By arranging the magnetizing block in the middle position of the cavity 1, the magnetic field distribution that affects the contact system can be reduced to reduce the electric repulsion force on the contact system, thereby greatly improving the short-term current tolerance capability of the moving contact assembly.

[0026] Embodiment 4, as a further preferred solution of embodiment 3, a snap-in hole 7 is provided in the middle of the upper surface of the cavity 1, and a snap-in 8 is provided on the upper surface of the mounting cover 5, and the snap-in 8 is fixedly engaged with the snap-in hole 7. Therefore, during installation, it is only necessary to place the magnetizing block in the mounting cover 5, and then, through the engagement of the snap-in 8 with the snap-in hole 7, the mounting cover 5 is snap-into the middle of the inner cavity of the cavity 1 to achieve installation and fixation, and when replacing, it is only necessary to remove the mounting cover 5, which is convenient and quick.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A contact cavity structure of a DC contactor, comprising a cavity (1), wherein the upper surface of the cavity (1) is provided with two mounting holes (2) for mounting a pair of stationary contacts, characterized in that: A plurality of mutually parallel ceramic ribs (3) are evenly arranged along the inner wall of the inner cavity of the cavity body (1), and the ceramic ribs (3) are arranged parallel to the axis of the stationary contact.

2. The contact cavity structure of a DC contactor according to claim 1, characterized in that: The ceramic ribs (3) and the cavity (1) are both integrally formed of ceramic.

3. The contact cavity structure of a DC contactor according to claim 1, characterized in that: The left and right sides of the cavity (1) are both provided with magnet mounting grooves (4), the magnet mounting grooves (4) are respectively located on the sides of the two static contacts that are away from each other, and the magnet mounting grooves (4) are used to mount and place permanent magnets.

4. The contact cavity structure of a DC contactor according to claim 1, characterized in that: A mounting cover (5) is installed in the middle of the inner cavity of the cavity (1), and a magnetizing block is provided in the inner cavity of the mounting cover (5).

5. The contact cavity structure of a DC contactor according to claim 4, characterized in that: A snap-fit ​​hole (7) is provided in the middle of the upper surface of the cavity (1), and a snap buckle (8) is provided on the upper surface of the mounting cover (5), and the snap buckle (8) is matched with the snap-fit ​​hole (7) for snap-fitting and fixing.

6. The contact cavity structure of a DC contactor according to claim 1, characterized in that: The ceramic ribs (3) respectively located on two opposite side walls of the cavity (1) are arranged symmetrically.

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