Static contact assembly and high-voltage direct-current relay

By using a threaded sleeve with a harder harder than a static contact in a high-voltage DC relay to connect to external equipment, the sliding teeth or damage caused by the reduction of the hardness of the static contact after high-temperature sealing is solved, and the installation reliability and connection firmness of the equipment are improved.

CN222927387UActive Publication Date: 2025-05-30XIAMEN HONGFA ELECTRIC POWER CONTROLS CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202421520083.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-28
Publication Date
2025-05-30
Estimated Expiration
2034-06-28

AI Technical Summary

Technical Problem

The hardness of the static contacts of the high-voltage DC relay decreases after high-temperature sealing, resulting in easy sliding teeth, damage when connected to the screw, and even causing product scrapping.

Method used

A threaded sleeve with a harder than a static contact is used instead of the connecting hole of the static contact, for connection with external equipment, and the static contact and the threaded sleeve are connected by brazing to ensure an unremovable connection.

Benefits of technology

It reduces the probability of sliding teeth or damage when the static contact is directly threaded, improves the installation reliability of high-voltage DC relays, and enhances the connection between the threaded sleeve and the static contacts.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222927387U_ABST
    Figure CN222927387U_ABST
Patent Text Reader

Abstract

The utility model discloses a static contact assembly and a high voltage direct current relay, the static contact assembly is used for the high voltage direct current relay, the static contact assembly comprises a static contact, the static contact is provided with a connecting hole; the thread bushing is used for being matched with an external thread piece to be connected with external equipment, and internal threads are arranged on the inner circumferential surface of the thread bushing; the threaded sleeve is connected into the connecting hole in a non-detachable mode. According to the utility model, the conductive performance of the static contact is ensured, and a proper thread bushing can be adopted to be matched with the external thread piece according to actual requirements, so that the thread is not easy to loosen or even be damaged when the static contact is in threaded connection with the external thread piece; therefore, the probability that in the prior art, when the static contact is directly in threaded connection with the external thread part, the thread is easy to loosen and even damaged is reduced, and the installation reliability of the high-voltage direct-current relay is greatly improved.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to a static contact assembly and a high-voltage DC relay. Background Art

[0002] A relay is an electronic control device which is usually applied to an automatic control circuit. It is actually an "automatic switch" that uses a smaller current to control a larger current, so it plays roles such as automatic regulation, safety protection, and circuit conversion in the circuit. A high-voltage DC relay is a kind of relay which usually has two static contacts. The two static contacts are used as lead-out ends to be connected with external devices. Specifically, connection holes with internal threads are arranged on each static contact, and screws are used in cooperation to realize the mechanical connection between the static contact and the external device. Since the material of the static contact is oxygen-free copper, after the high-voltage DC relay is subjected to high-temperature sealing, the hardness of the oxygen-free copper will decrease. When the connection hole of the static contact is threadedly connected with the screw thread, if the torque of the screw is too large, it is easy to have thread stripping, damage, and even cause the product to be scrapped. Summary of the Utility Model

[0003] Aiming at the technical problems existing in the prior art, the utility model provides a static contact assembly and a high-voltage DC relay, which use a threaded sleeve with a hardness greater than that of the static contact to replace the connection hole of the static contact to connect external devices, reducing the probability of thread stripping or even damage when the static contact is directly threadedly connected.

[0004] The technical solution adopted by the utility model to solve its technical problems is: a static contact assembly for a high-voltage DC relay, including a static contact provided with a connection hole; and a threaded sleeve for cooperating with an external threaded part to connect an external device, the inner peripheral surface of the threaded sleeve being provided with internal threads; the threaded sleeve is non-removably connected in the connection hole.

[0005] Further, the hardness of the threaded sleeve is greater than that of the static contact.

[0006] Further, the threaded sleeve is made of a metal material, and the threaded sleeve is brazed to the static contact.

[0007] Further, the material of the threaded sleeve is stainless steel or dispersion copper or steel 10B21 or brass, and the material of the static contact is oxygen-free copper.

[0008] Further, a limiting boss is arranged on the outer peripheral surface of the threaded sleeve at one end of the threaded sleeve for the external threaded part to be inserted; a limiting step surface corresponding to the limiting boss is arranged on the inner peripheral surface of the connection hole, and the limiting boss is placed on the limiting step surface.

[0009] Further, it further includes a pressing member, which is fixedly connected to the static contact and presses one end of the threaded sleeve into which the external threaded member is inserted; the pressing member is provided with a relief through hole leading to the inner cavity of the threaded sleeve to provide relief for the external threaded member.

[0010] Further, the pressing member is made of metal and is brazed to the static contact, or the pressing member is brazed to the static contact and the threaded sleeve.

[0011] Further, the pressing member is made of copper or copper alloy.

[0012] Further, the pressing member is annular and at least part of it enters the connection hole.

[0013] Further, openings are respectively provided at both ends of the threaded sleeve, or an opening is provided at one end of the threaded sleeve into which the external threaded member is inserted, and the other end is closed.

[0014] The present utility model further provides a high-voltage DC relay, which includes a plurality of the static contact assemblies described in the present utility model above.

[0015] Further, it further includes a ceramic cover, and each static contact is respectively brazed to the ceramic cover, and each static contact respectively partially enters the ceramic cover.

[0016] Compared with the prior art, the present utility model has the following beneficial effects:

[0017] 1. Since the present utility model further includes a threaded sleeve for cooperating with an external threaded member to connect an external device, the inner peripheral surface of the threaded sleeve is provided with internal threads, and the threaded sleeve is non-removably connected to the connection hole of the static contact, which not only ensures the electrical conductivity of the static contact but also facilitates the use of a suitable threaded sleeve to cooperate with the external threaded member according to actual needs, making it not easy to have slipping teeth or even damage when threadedly connecting with the external threaded member, thereby reducing the probability of slipping teeth or even damage that is likely to occur when the static contact is directly threadedly connected to the external threaded member in the prior art, and further greatly improving the installation reliability of the high-voltage DC relay.

[0018] 2. The threaded sleeve is preferably made of metal and is brazed to the static contact, which can greatly improve the connection firmness and convenience between the threaded sleeve and the static contact.

[0019] 3. The setting of the limiting convex platform and the limiting step surface can accurately control the insertion depth of the threaded sleeve in the connection hole.

[0020] 4. The present utility model further includes a pressing member, which presses one end of the threaded sleeve into which the external threaded member is inserted by using the pressing member, thereby further improving the connection firmness between the threaded sleeve and the static contact.

[0021] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments; however, a static contact assembly and a high-voltage DC relay of the present utility model are not limited to the embodiments. Description of the Drawings

[0022] Figure 1 FIG. 6 is a schematic perspective view of the static contact assembly of the present utility model in Embodiment 1;

[0023] Figure 2 FIG. 10 is a cross-sectional view of the static contact of the present utility model in Embodiment 1;

[0024] Figure 3 FIG. 14 is a schematic perspective view of the threaded sleeve of the present utility model in Embodiment 1;

[0025] Figure 4 FIG. 18 is a cross-sectional view of the threaded sleeve of the present utility model in Embodiment 1;

[0026] Figure 5 FIG. 22 is a top view of the static contact assembly of the present utility model in Embodiment 1;

[0027] Figure 6 FIG. 26 is a cross-sectional view taken along line A-A of the static contact assembly of the present utility model in Embodiment 1;

[0028] Figure 7 FIG. 30 is a cross-sectional view of the threaded sleeve of the present utility model in Embodiment 2;

[0029] Figure 8 FIG. 34 is a cross-sectional view of the static contact assembly of the present utility model in Embodiment 2;

[0030] Figure 9 FIG. 38 is a schematic perspective view of the static contact assembly of the present utility model in Embodiment 3;

[0031] Figure 10 FIG. 42 is a top view of the present utility model in Embodiment 3;

[0032] Figure 11 FIG. 46 is a cross-sectional view taken along line B-B of the static contact assembly of the present utility model in Embodiment 3;

[0033] Figure 12 FIG. 50 is a combined schematic view of the insulating cover and the static contact assembly of the present utility model;

[0034] Figure 13 FIG. Figure 12 is a top view of

[0035] Figure 14 FIG. Figure 13 is a cross-sectional view taken along line C-C of

[0036] Figure 15 FIG. 66 is a schematic perspective view of the high-voltage DC relay of the present utility model;

[0037] In the figure, 1 is the static contact, 11 is the connection hole, 111 / 23 is the limiting step surface, 2 is the threaded sleeve, 21 is the internal thread, 22 is the limiting boss, 3 is the pressing member, 31 is the relief through hole, 4 is the ceramic cover, and 5 is the housing. Specific embodiments

[0038] In the description of the present invention, unless otherwise specified, "a plurality" means two or more. In the description of the present invention, unless otherwise clearly defined and limited, terms such as "installation", "setting", "connection", etc. shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0039] Embodiment 1

[0040] Please refer to Figures 1 - 6 As shown, a static contact assembly of the present invention for a high-voltage DC relay includes a static contact 1. A connection hole 11 is provided on the end face of one end of the static contact 1. The connection hole 11 extends along the axial direction of the static contact 1, and the connection hole 11 is in the form of a blind hole, that is, the bottom end of the connection hole 11 is closed. The present invention also includes a threaded sleeve 2 for cooperating with an external threaded member to connect an external device. The inner circumferential surface of the threaded sleeve 2 is provided with an internal thread 21. The threaded sleeve 2 is non-removably connected in the connection hole 11, and the end face of the threaded sleeve 2 for the external threaded member to be inserted into is flush with the top end face of the static contact 1. In this embodiment, both ends of the threaded sleeve 2 are provided with openings, so the threaded sleeve 2 is in a vertically through state.

[0041] In this embodiment, the hardness of the threaded sleeve 2 is greater than that of the static contact 1. The threaded sleeve 2 is made of metal. Specifically, the material of the threaded sleeve 2 is stainless steel or dispersion copper or steel 10B21 or brass, preferably stainless steel. The threaded sleeve 2 is brazed to the static contact 1, but the non-removable connection method is not limited to this, and it can also be argon arc welding or resistance welding, etc. In other embodiments, the threaded sleeve is made of non-metal material.

[0042] As Figure 3 、 Figure 4 shown, a limiting boss 22 is provided on the outer circumferential surface of the threaded sleeve 2. The limiting boss 22 is located at the end of the threaded sleeve 2 for the external threaded member to be inserted into. A limiting step surface 111 is provided on the inner circumferential surface of the connection hole 11 corresponding to the limiting boss 22, as Figure 2 shown. The limiting boss 22 of the threaded sleeve 2 is placed on the limiting step surface 111 of the connection hole 11, as Figure 6As shown in the figure. Therefore, the utility model can improve the matching precision between the threaded sleeve 2 and the connecting hole 11 by using the cooperation between the limiting boss 22 and the limiting step surface 11, but it is not limited to this. In other embodiments, making the threaded sleeve and the connecting hole fit tightly can also improve their matching precision.

[0043] Therefore, when the static contact assembly of the utility model is connected to an external device, the threaded sleeve 2 can be directly used to cooperate with an external threaded part to connect with the external device, and the external threaded part is usually a screw. Since the threaded sleeve 2 and the static contact 1 are discrete components, they can be made of different materials, which not only ensures the conductivity of the static contact of the utility model, but also facilitates the use of a suitable threaded sleeve to cooperate with the screw according to actual needs, so that it is not easy to have problems such as slipping teeth or even damage when the threaded sleeve is threadedly connected to the screw. In particular, the material of the threaded sleeve 2 of the utility model is stainless steel or dispersion copper or steel 10B21 or brass, preferably stainless steel. After the entire static contact assembly is heat-treated, the hardness of the threaded sleeve 2 is greater than that of the static contact 1. Therefore, when the torque of the screw is large, the threaded sleeve 2 is not easy to have a problem of slipping teeth, solving the problem that the existing technology is easy to have slipping teeth or even damage when the static contact is directly threadedly connected to the screw, thus greatly improving the installation reliability of the high-voltage DC relay.

[0044] Embodiment 2

[0045] Please refer to Figure 7 、 Figure 8 As shown in the figure, a static contact assembly of the utility model is different from that of the first embodiment in that: one end of the threaded sleeve 2 for the external threaded part to be inserted is provided with an opening, and the other end is closed. In this way, it can prevent the solder from melting and entering the threaded sleeve 2 from the lower end of the threaded sleeve 2 when the solder is placed at the lower part of the threaded sleeve 2, thereby increasing the connection firmness between the threaded sleeve 2 and the static contact 1 while not affecting the connection effect with the external device.

[0046] In this embodiment, the parts not involved are the same as those in the first embodiment.

[0047] Embodiment 3

[0048] Please refer to Figures 9 - 11 As shown in the figure, a static contact assembly of the utility model is different from that of the first embodiment in that: the static contact assembly of the utility model further includes a pressing part 3, which is fixedly connected to the static contact 1 and presses one end of the threaded sleeve 2 for the external threaded part to be inserted. The pressing part 3 is provided with a relief through hole 31 leading to the inner cavity of the threaded sleeve 2 to provide relief for the external threaded part.

[0049] The above-mentioned pressing member 3 is made of metal, specifically copper or copper alloy, but is not limited thereto. The pressing member 3 is brazed to the static contact 1, or the pressing member 3 is brazed to the static contact 1 and the threaded sleeve 2. The pressing member 3 is annular, and at least part of it enters the connection hole 11. Specifically, in this embodiment, the whole pressing member enters the connection hole 11, and the exposed end face of the pressing member 3 is flush with the top end face of the static contact 1.

[0050] In this embodiment, openings are respectively provided at both ends of the threaded sleeve 2, but are not limited thereto. In other embodiments, an opening is provided at one end of the threaded sleeve 2 for inserting an external threaded member, and the other end of the threaded sleeve 2 is closed.

[0051] In this embodiment, a circumferential limiting step surface 23 is provided at the edge of the end of the threaded sleeve 2 for inserting an external threaded member. The longitudinal section of the pressing member is generally in an inverted L shape, and one side is placed on the end face of the end of the threaded sleeve 2 adjacent to one end of the static contact 1, and the other side is placed on the limiting step surface 23.

[0052] The utility model uses the pressing member 3 to press the threaded sleeve 2, which can further improve the connection firmness between the threaded sleeve 2 and the static contact 1.

[0053] Please refer to Figures 12 - 15 As shown, a high-voltage DC relay of the utility model includes the static contact assembly of the utility model described in any of the above embodiments. Specifically, the static contact assembly of Embodiment 1 of the utility model is taken as an example for illustration. Figure 14 The internal thread of the threaded sleeve 2 is not shown. The number of static contact assemblies is multiple, specifically two, but is not limited thereto.

[0054] The utility model further includes a ceramic cover 4. The two static contact assemblies are respectively installed on the top wall of the ceramic cover 4, and the other ends of the static contacts 1 of the two static contact assemblies respectively extend into the ceramic cover 4 to contact and cooperate with a moving contact (not shown in the figure) located in the ceramic cover 4.

[0055] The utility model further includes a housing 5. The ceramic cover 4 is located in the housing 5, and the tops of the two static contact assemblies respectively protrude out of the top end of the housing 5.

[0056] For a high-voltage DC relay of the utility model, the parts not involved are the same as or can be implemented by using the prior art.

[0057] The above embodiments are only used to further illustrate a static contact assembly and a high-voltage DC relay of the utility model, but the utility model is not limited to the embodiments. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the utility model all fall within the protection scope of the technical solution of the utility model.

Claims

1. A stationary contact assembly for a high voltage DC relay, comprising a stationary contact, wherein the stationary contact is provided with a connection hole; characterized in that: It also includes a threaded sleeve for cooperating with the external threaded member to connect to an external device, wherein the inner circumference of the threaded sleeve is provided with an internal thread; the threaded sleeve is non-detachably connected to the connecting hole.

2. The stationary contact assembly according to claim 1, characterized in that: The hardness of the threaded sleeve is greater than the hardness of the static contact.

3. The stationary contact assembly according to claim 2, characterized in that: The threaded sleeve is made of metal and is connected to the static contact by brazing.

4. The stationary contact assembly according to claim 3, characterized in that: The material of the threaded sleeve is stainless steel, dispersed copper, steel 10B21 or brass, and the material of the static contact is oxygen-free copper.

5. The stationary contact assembly according to claim 1, characterized in that: The outer circumferential surface of the threaded sleeve is provided with a limiting boss, which is located at one end of the threaded sleeve for inserting the external threaded member; the inner circumferential surface of the connecting hole is provided with a limiting step surface opposite to the limiting boss, and the limiting boss rests on the limiting step surface.

6. The stationary contact assembly according to any one of claims 1 to 5, characterized in that: It also includes a clamping piece, which is fixedly connected to the static contact and clamps one end of the threaded sleeve for the external threaded piece to be inserted; the clamping piece is provided with a clearance through hole leading to the inner cavity of the threaded sleeve to provide clearance for the external threaded piece.

7. The stationary contact assembly according to claim 6, characterized in that: The pressing piece is made of metal, and is connected to the stationary contact by brazing, or the pressing piece is connected to the stationary contact and the threaded sleeve by brazing.

8. The stationary contact assembly according to claim 7, characterized in that: The pressing piece is made of copper or copper alloy.

9. The stationary contact assembly according to claim 6, characterized in that: The pressing piece is annular and at least partially enters the connecting hole.

10. The stationary contact assembly according to claim 1, characterized in that: Both ends of the threaded sleeve are respectively provided with openings, or one end of the threaded sleeve for inserting the external threaded member is provided with an opening, and the other end is closed.

11. A high voltage DC relay, characterized in that: The invention comprises a plurality of stationary contact assemblies according to any one of claims 1 to 10.

12. The high voltage DC relay according to claim 11, characterized in that: It also includes a ceramic cover, each static contact is respectively connected to the ceramic cover by brazing, and each static contact is partially inserted into the ceramic cover.