Inner support cover and high voltage DC relay

Abstract

The utility model discloses an inner support cover and a high-voltage DC relay, comprising an inner support cover body, an arc extinguishing chamber is formed inside the inner support cover body, and a thickened rib for locally thickening the wall thickness of the arc extinguishing chamber is provided at the arc erosion area corresponding to the inner wall of the arc extinguishing chamber. The utility model arranges the thickened rib at the arc erosion area where the arc extinguishing chamber is easily burned through by the arc during use, that is, the arc erosion area is locally thickened, so as to delay the arc burning through the arc extinguishing chamber, improve the problem of product failure caused by the arc erosion of the arc extinguishing chamber in the load switching life interval, thereby improving the product service life and ensuring the normal use of the product within the promised life interval.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to an inner support cover and a high-voltage direct current relay. Background Art

[0002] At present, epoxy-encapsulated high-voltage DC relay products all use engineering plastics as the inner support cover material, and an arc extinguishing chamber is set in the inner support cover. However, due to the limitations of the material, the product basically fails at the end of its life of on-load switching due to the arc extinguishing chamber being burned through. In response to this defect, the existing technology uses the method of adding an isolation arc layer such as a ceramic cover to solve the problem of the arc extinguishing chamber in the inner support cover being burned through, but the use of the ceramic cover will undoubtedly increase the product cost, and will also occupy the arc extinguishing space, resulting in a reduction in the arc extinguishing space, which will affect the arc extinguishing effect to a certain extent. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides an inner support cover, which mainly solves the technical problem that the arc extinguishing chamber in the existing inner support cover is basically burned through at the end of the load switching life, resulting in failure of the relay product.

[0004] In order to achieve the above object, the utility model is realized by the following technical solutions:

[0005] An inner support cover comprises an inner support cover body, an arc extinguishing chamber is formed inside the inner support cover body, and thickening ribs for locally thickening the arc extinguishing chamber wall thickness are arranged at the inner wall of the arc extinguishing chamber corresponding to the arc ablation area.

[0006] Furthermore, the cross section of the thickened rib is semicircular.

[0007] Furthermore, the cross section of the thickened rib is square.

[0008] Furthermore, the cross section of the thickened rib is triangular.

[0009] Furthermore, the cross section of the thickened rib is wavy.

[0010] Furthermore, the cross section of the thickened rib is trapezoidal.

[0011] Furthermore, the thickened ribs and the inner wall of the arc extinguishing chamber are an integral injection-molded structure.

[0012] Furthermore, a plurality of thickened ribs corresponding to the arc erosion areas are formed on the inner wall of the arc extinguishing chamber.

[0013] Furthermore, four thickened ribs corresponding to the arc erosion areas are formed on the inner wall of the arc extinguishing chamber.

[0014] Based on the same inventive concept, the utility model also provides a high-voltage DC relay, comprising any of the inner support covers described above.

[0015] The above technical solution has the following advantages or beneficial effects:

[0016] In the inner support cover and the high-voltage DC relay described in the utility model, thickened ribs are provided at the arc erosion area where the arc extinguishing chamber is easily burned through by the arc during use, that is, the arc erosion area is locally thickened, so as to delay the arc burning through the arc extinguishing chamber, improve the problem of product failure caused by the arc burning through the arc extinguishing chamber within the load switching life range, thereby increasing the service life of the product and ensuring the normal use of the product within the promised life range. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the inner support cover of the first embodiment of the utility model.

[0018] Figure 2 It is a schematic diagram of the three-dimensional structure of the inner support cover of the first embodiment of the utility model from another angle.

[0019] Figure 3 It is a schematic diagram of the assembly structure of the inner support cover, the moving contact piece and the static contact of the first embodiment of the utility model.

[0020] Figure 4 It is a structural schematic diagram of the inner support cover of the second embodiment of the utility model.

[0021] Description of labels:

[0022] 1. Inner support cover body, 11. Arc extinguishing chamber, 12. Thickened ribs, 2. Moving contact piece, 3. Static contact. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0025] Embodiment 1

[0026] Please refer to the attached Figure 1 , Attachment Figure 2 , Attachment Figure 3One embodiment of the utility model provides an inner support cover, including an inner support cover body 1, an arc extinguishing chamber 11 is formed inside the inner support cover body 1, and a thickened rib 12 for locally thickening the wall thickness of the arc extinguishing chamber is provided at the arc erosion area corresponding to the inner wall of the arc extinguishing chamber 11. It can be understood that in this embodiment, the thickened rib 12 is provided at the arc erosion area where the arc extinguishing chamber 11 is easily burned through by the arc during use, that is, the arc erosion area is locally thickened, so as to delay the arc burning through the arc extinguishing chamber, improve the problem of product failure caused by the arc burning through the arc extinguishing chamber during the load switching life range, thereby improving the product service life and ensuring the normal use of the product within the promised life range.

[0027] Please refer to the attached Figure 1 , Attachment Figure 2 , in one preferred embodiment, the cross section of the thickened rib 12 is semicircular. However, those skilled in the art should understand that in other embodiments, the cross section of the thickened rib 12 may also be other shapes, and is not limited to the specific implementation method disclosed in this embodiment, as long as it can play a local thickening role in the arc erosion area to delay the arc burn-through. In addition, in this embodiment, the arc erosion area refers to the area on the inner wall of the arc extinguishing chamber 1 close to the matching position of the moving contact piece and the static contact. The moving contact piece and the static contact will generate a high-temperature arc when they are disconnected. The closer the inner wall of the arc extinguishing chamber 1 is to the arc generation position, the greater the risk of being broken down by the high-temperature arc. The specific position and range of the arc erosion area can be specifically determined by those skilled in the art according to the degree of erosion of the inner wall of the arc extinguishing chamber 11 by the high-temperature arc during the use of the relay product.

[0028] Please refer to the attached Figure 1 , Attachment Figure 2 In one preferred embodiment, the thickened rib 12 and the inner wall of the arc extinguishing chamber 11 are an integral injection molding structure. In this embodiment, by arranging the thickened rib 12 in the arc erosion area corresponding to the arc extinguishing chamber, not only can the erosion be delayed to increase the service life of the product, but also the arrangement of the thickened rib 12 does not substantially affect the size of the internal space of the arc extinguishing chamber 11.

[0029] Please refer to the attached Figure 1 , Attachment Figure 2 In one preferred embodiment, a plurality of thickened ribs 12 corresponding to the arc erosion areas are formed on the inner wall of the arc extinguishing chamber 11. In this embodiment, preferably, four thickened ribs 12 corresponding to the arc erosion areas are formed on the inner wall of the arc extinguishing chamber 11. That is, in this embodiment, the local thickening design is mainly performed for the four arc erosion areas of the arc extinguishing chamber 11 that are more easily burned by the arc during use. However, those skilled in the art should understand that in other embodiments, the number of thickened ribs 12 is not limited to the specific implementation method disclosed in this embodiment.

[0030] Please refer to the attached Figure 1 , Attachment Figure 2 An embodiment of the utility model also provides a high-voltage DC relay, including the inner support cover of any of the above embodiments.

[0031] Embodiment 2

[0032] Please refer to the attached Figure 4 The difference between this embodiment and the first embodiment is that the cross section of the thickened rib 12 is triangular.

[0033] Embodiment 3

[0034] The difference between this embodiment and the first embodiment is that the cross section of the thickened rib 12 is square.

[0035] Embodiment 4

[0036] The difference between this embodiment and the first embodiment is that the cross section of the thickened rib 12 is wavy.

[0037] Embodiment 5

[0038] The difference between this embodiment and the first embodiment is that the cross section of the thickened rib 12 is trapezoidal.

[0039] As described above, the embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. These modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model. Therefore, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the protection scope of the utility model.

Claims

1. An inner support cover, comprising an inner support cover body (1), wherein an arc extinguishing chamber (11) is formed inside the inner support cover body (1), characterized in that: A thickening rib (12) for locally thickening the wall thickness of the arc extinguishing chamber (11) is provided at a location on the inner wall of the arc extinguishing chamber (11) corresponding to the arc ablation region.

2. The inner support cover according to claim 1, characterized in that: The cross section of the thickened rib portion (12) is semicircular.

3. The inner support cover according to claim 1, characterized in that: The cross section of the thickened rib portion (12) is square.

4. The inner support cover according to claim 1, characterized in that: The cross section of the thickened rib portion (12) is triangular.

5. The inner support cover according to claim 1, characterized in that: The cross section of the thickened rib portion (12) is wave-shaped.

6. The inner support cover according to claim 1, characterized in that: The cross section of the thickened rib portion (12) is trapezoidal.

7. The inner support cover according to any one of claims 1 to 6, characterized in that: The thickened rib portion (12) and the inner wall of the arc extinguishing chamber (11) are an integral injection-molded structure.

8. The inner support cover according to any one of claims 1 to 6, characterized in that: A plurality of thickened ribs (12) corresponding to arc ablation areas are formed on the inner wall of the arc extinguishing chamber (11).

9. The inner support cover according to claim 8, characterized in that: Four thickened ribs (12) corresponding to arc ablation areas are formed on the inner wall of the arc extinguishing chamber (11).

10. A high voltage DC relay, characterized in that: An inner support cover as claimed in any one of claims 1 to 9.

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