Heat dissipation structure for high-voltage direct-current relay

Abstract

The utility model relates to a high voltage direct current relay, specifically relates to a heat radiation structure for high voltage direct current relay, a heat radiation structure for high voltage direct current relay, including insulating cover, the insulating cover constitutes the chamber for containing movable contact component and static contact component, the cover portion of insulating cover is fixed with a plurality of heat conduction spare, the heat conduction spare has the inner section of in -punching the chamber, the outer section of being located insulating cover outside, the inner section of heat conduction spare does not contact movable contact component and static contact component, the heat conduction spare and the sealing treatment of insulating cover junction place, the utility model has the advantages of good heat dissipation effect, the heat dissipation is more uniform, and the assembly is convenient.

Description

Technical Field

[0001] This utility model relates to a high-voltage DC relay, specifically to a heat dissipation structure for a high-voltage DC relay. Background Technology

[0002] Chinese patent application number 201921976960.6 discloses a high-voltage DC relay, which sets multiple partitions between two pairs of moving and stationary contacts to form a box-shaped structure with blind slots (cavities). The upper end of the box-shaped structure extends above the insulating cover and is located between the two leads. The lower part of the partition is provided with oblique holes.

[0003] In the above scheme, the high-temperature gas can enter the blind slot through the oblique hole and then dissipate heat through the heat exchange of the thinner part of the upper part of the box structure. However, the blind hole is small and the gas flow rate is low, making it difficult for the high-temperature gas to enter the blind slot effectively. Moreover, the heat exchange is only carried out at the end, resulting in limited heat conduction capacity. Utility Model Content

[0004] The purpose of this invention is to provide a heat dissipation structure for high-voltage DC relays with better heat dissipation performance.

[0005] To achieve the above objectives, this utility model employs a heat dissipation structure for a high-voltage DC relay, including an insulating cover. The insulating cover forms a cavity for accommodating a moving contact assembly and a stationary contact assembly. The insulating cover is characterized by having a plurality of heat-conducting elements fixed to its cover portion. Each heat-conducting element has an inner section extending into the cavity and an outer section located outside the insulating cover. The inner section of the heat-conducting element does not contact the moving contact assembly and the stationary contact assembly. The connection between the heat-conducting element and the insulating cover is sealed.

[0006] This utility model of a relay uses a heat-conducting component made of a material with good thermal conductivity, such as copper or aluminum, fixed on an insulating cover. The gas inside the cavity housing the moving and stationary contacts can directly contact the heat-conducting component, thus enabling heat transfer solely through it. Compared to the multi-stage series thermal resistance of solutions mentioned in the background art, this significantly reduces thermal resistance and improves heat dissipation. The heat-conducting component can be evenly distributed at various positions on the insulating cover as needed, achieving uniform heat dissipation within the cavity. The heat-conducting component can be fixed to the insulating cover using various existing methods such as welding, threaded fixing, or adhesive fixing.

[0007] Preferably, the cavity is provided with an isolation element, which is located between the heat-conducting element and the moving contact assembly and the stationary contact assembly. By providing the isolation element, the electric arc generated by the contact segment between the moving and stationary contacts is prevented from directly striking the heat-conducting element.

[0008] Preferably, the isolator surrounds or partially surrounds the heat-conducting element and is fixed to the insulating cover, with the lower end of the isolator positioned above the lower end of the insulating cover. By blocking only the arc path, the flow of gas inside the chamber can be ensured, thereby facilitating heat transfer.

[0009] Preferably, the outer surface of the cover of the insulating cover is provided with a positioning groove, and the cover is also provided with a fixing hole for the inner section to pass through. The width of the outer section is greater than the width of the inner section, and the connection point between the outer section and the inner section is located within the positioning groove. The positioning groove positions the outer section and prevents the heat-conducting component from extending excessively into the insulating cover, facilitating subsequent assembly and sealing between the heat-conducting component and the insulating cover.

[0010] Preferably, the insulating cover is provided with an outer shell, which has an enclosure portion located circumferentially outward and extending upward from the insulating cover. The enclosure portion is filled with sealant, which seals the connection between the heat-conducting component and the insulating cover. This arrangement facilitates the sealing and positioning of the heat-conducting component, and also facilitates its assembly.

[0011] Preferably, the upper side of the enclosure of the housing is provided with a top, and a vent is provided on the top or the side wall of the enclosure. By providing a vent, air can circulate inside the relay with the housing, thereby facilitating heat dissipation from the outer section of the heat-conducting component.

[0012] Preferably, ventilation openings are provided on the side walls of opposite sides of the top or enclosure. By providing oppositely positioned ventilation openings, airflow is made smoother, facilitating the removal of heat from the outer section of the heat-conducting component.

[0013] Preferably, the inner or outer section comprises several convex strips or dots extending circumferentially and outward. This maximizes the surface area of ​​the heat-conducting component and improves overall heat dissipation without adding additional parts. Simultaneously, the convex strips can serve as a rotation-resistant structure after potting or engaging with the positioning groove, preventing loosening.

[0014] Preferably, the insulating cover has a set of heat-conducting elements on each of its opposite sides, and the moving contact assembly and the stationary contact assembly are located between the two sets of heat-conducting elements. Each set of heat-conducting elements includes several of the heat-conducting elements. This arrangement achieves uniform heat dissipation within the cavity.

[0015] This invention has the advantages of good heat dissipation, more uniform heat dissipation, and easy assembly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the heat-conducting component and the insulating cover of this utility model.

[0017] Figure 2 This is a cross-sectional view of the heat-conducting component and the insulating cover of this utility model.

[0018] Figure 3 This is a schematic diagram of the structure of the high-voltage DC relay of this utility model.

[0019] Figure 4 for Figure 3 A schematic diagram of a medium- or high-voltage DC relay after removing the top. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0021] Depend on Figure 1 and Figure 2 As shown, this embodiment discloses a heat dissipation structure for a high-voltage DC relay, including an insulating cover 1. The insulating cover 1 forms a chamber 10 for accommodating a moving contact assembly and a stationary contact assembly. A plurality of heat-conducting elements 2 are fixed on the cover of the insulating cover 1. The heat-conducting elements 2 have an inner section 21 extending into the chamber 10 and an outer section 22 located outside the insulating cover 1. The inner section 21 of the heat-conducting elements 2 does not contact the moving contact assembly and the stationary contact assembly. The connection between the heat-conducting elements 2 and the insulating cover 1 is sealed.

[0022] Depend on Figure 1 and Figure 4 As shown, the insulating cover 1 has a set of heat-conducting components on both the left and right sides. Each set of heat-conducting components includes two heat-conducting components 2 spaced apart. The static contact assembly in this embodiment includes two lead-out ends 3 spaced apart. A static contact is provided at the lower end face of the lead-out end 3. Each lead-out end 3 has a heat-conducting component 2 on its left and right sides. A magnet 4 is provided on the front and rear sides of the lead-out end.

[0023] Depend on Figure 1 and Figure 2 As shown, a spacer 11 is provided inside the chamber 10. The spacer 11 is located between the heat-conducting component 2 and the moving contact assembly and the stationary contact assembly. The spacer 11 and the inner circumferential wall of the insulating cover 1 surround the heat-conducting component 2. The upper end of the spacer 11 is fixed to the cover of the insulating cover, the lateral edge of the spacer 11 is fixed to the inner circumferential wall of the insulating cover 1, and the lower end of the spacer 11 is located above the lower end of the insulating cover 1. In this embodiment, the insulating cover 1 and the spacer 11 are integrally molded from plastic material.

[0024] Depend on Figure 2 As shown, the upper surface of the cover of the insulating cover 1 is provided with a positioning groove, and the cover is also provided with a fixing hole for the inner section 21 to pass through. The diameter of the outer section 22 is larger than the diameter of the inner section 22, and the outer section 22 is used to connect with the inner section 21 within the positioning groove. The outer wall of the inner section 21 and the wall of the fixing hole are provided with a threaded structure that matches each other, and the outer section 22 forms several convex strips extending outward in a circumferential direction.

[0025] Depend on Figure 3 and Figure 4As shown, the insulating cover 1 is provided with an outer shell 5. The outer shell 5 has a surrounding portion 51 extending outward and upward from the periphery of the insulating cover 1. The surrounding portion 51 is filled with sealant, which seals the connection between the heat-conducting component 2 and the insulating cover 1. Figure 3 As shown, a cover-shaped top 52 is snapped onto the upper side of the enclosure portion 51 of the outer shell 5, and ventilation openings 53 are provided on the side walls of the top 52 on both sides.

Claims

1. A heat dissipation structure for a high-voltage DC relay, comprising an insulating cover, the insulating cover forming a chamber for accommodating a moving contact assembly and a stationary contact assembly, characterized in that: The cover of the insulating cover is fixed with a plurality of heat-conducting components. Each heat-conducting component has an inner section extending into the cavity and an outer section located outside the insulating cover. The inner section of the heat-conducting component does not contact the moving contact assembly and the stationary contact assembly. The connection between the heat-conducting component and the insulating cover is sealed.

2. The heat dissipation structure for a high-voltage DC relay according to claim 1, characterized in that: The cavity is provided with an isolation element, which is located between the heat-conducting element and the moving contact assembly and the stationary contact assembly.

3. The heat dissipation structure for a high-voltage DC relay according to claim 2, characterized in that: The insulating member surrounds or partially surrounds the heat-conducting member and is fixed to the insulating cover, with the lower end of the insulating member located above the lower end of the insulating cover.

4. The heat dissipation structure for a high-voltage DC relay according to claim 1, characterized in that: The outer surface of the cover of the insulating cover is provided with a positioning groove, and the cover is also provided with a fixing hole for the inner section to pass through. The width of the outer section is greater than the width of the inner section, and the connection point between the outer section and the inner section is located in the positioning groove.

5. The heat dissipation structure for a high-voltage DC relay according to claim 1, characterized in that: The insulating cover is provided with an outer shell, which has an enclosure portion located on the outer periphery of the insulating cover and extending upward. The enclosure portion is filled with sealant, which seals the connection between the heat-conducting component and the insulating cover.

6. The heat dissipation structure for a high-voltage DC relay according to claim 5, characterized in that: The outer casing has a top on the upper side of the enclosure, and a vent is provided on the top or the side wall of the enclosure.

7. The heat dissipation structure for a high-voltage DC relay according to claim 6, characterized in that: Ventilation openings are provided on the side walls of the top or enclosure on both sides.

8. The heat dissipation structure for a high-voltage DC relay according to claim 1, characterized in that: The inner or outer segment forms a number of convex strips or protrusions extending circumferentially and outward.

9. The heat dissipation structure for a high-voltage DC relay according to claim 1, characterized in that: The insulating cover has a set of heat-conducting elements on both sides. The moving contact assembly and the stationary contact assembly are located between the two sets of heat-conducting elements. Each set of heat-conducting elements includes several of the heat-conducting elements.

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