Relay

Abstract

The present application relates to a relay, comprising an insulating cover, a static contact, and a protective layer. A chamber is provided in the interior of the insulating cover, and the insulating cover is further provided with a through hole that is in communication with the chamber. The static contact is limited to be located in the through hole, and the static contact is provided with a contact end and a connecting end. The contact end extends into the chamber, and the connecting end extends out of an outer surface of the insulating cover. The side of the connecting end facing away from the insulating cover is provided with a connecting surface. The protective layer covers the connecting surface and is used to be electrically connected to a conductive member.

Description

relay

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 7, 2024, with application number 202420288323.4 and application name “Relay”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of electric control devices, and in particular to a relay. Background Art

[0003] A relay is an electronic control device with a control circuit (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits. A relay is essentially an "automatic switch" that uses a smaller current to control a larger one. Therefore, it plays a role in automatic regulation, safety protection, and circuit switching.

[0004] A high-voltage DC relay is a type of relay. Traditionally, a high-voltage DC relay consists of an insulating cover, a stationary contact, and a conductive member. The stationary contact is welded to the insulating cover, and the conductive member is electrically connected to the portion of the stationary contact that extends beyond the outer surface of the insulating cover. However, the stationary contact is susceptible to oxidation, which affects the reliability of the contact between the conductive member and the stationary contact. Summary of the Invention

[0005] According to various embodiments of the present application, a relay is provided that solves the problem in the prior art that static contacts are easily oxidized, resulting in unreliable electrical connection between the conductive member and the static contact.

[0006] The relay of the embodiment of the present application includes:

[0007] An insulating cover having a chamber therein and a through hole communicating with the chamber;

[0008] a stationary contact, confined within the through hole; the stationary contact having a contact end and a connection end, the contact end extending into the chamber, the connection end extending out of the outer surface of the insulating cover; the connection end having a connection surface on a side facing away from the insulating cover; and

[0009] The protective layer covers the connection surface and is used for electrically connecting to the conductive member.

[0010] In one embodiment, the protective layer is made of a conductive material.

[0011] In one embodiment, the conductive material is silver or a silver alloy.

[0012] In one embodiment, it further includes:

[0013] The conductive member is electrically connected to a surface of the protection layer that is away from the connection surface.

[0014] In one embodiment, the static contact further has a first sunken groove and a threaded hole, the first sunken groove is recessed from the connecting surface along the axial direction of the static contact toward the contact end, and the threaded hole is recessed from the bottom surface of the first sunken groove along the axial direction of the static contact toward the contact end.

[0015] In one embodiment, the conductive member is electrically connected to a surface of the protective layer facing away from the connection surface, and the conductive member has a through hole at a position corresponding to the threaded hole;

[0016] A fastener passes through the through hole and is screwed into the threaded hole to fasten the conductive member and the static contact.

[0017] In one embodiment, a first chamfer is formed at a connection between a groove side surface of the first sinking groove and the connecting surface.

[0018] In one embodiment, a second chamfer is formed at a connection between an inner wall surface of the threaded hole and a bottom surface of the first sinking groove.

[0019] In one embodiment, a protrusion is provided on the inner wall surface of the insulating cover.

[0020] In one embodiment, the protrusion is an annular structure and surrounds the outer circumference of the static contact.

[0021] In one embodiment, the insulating cover comprises:

[0022] A ceramic cover having the cavity and the through hole; the static contact is welded to the ceramic cover; and

[0023] The frame piece is connected to the opening of the ceramic cover.

[0024] In one embodiment, a soldering platform is convexly provided on the outer wall of the insulating cover;

[0025] The static contact also has a welding foot, the welding platform is supported on the welding foot, and the welding platform is welded to the welding foot.

[0026] In one embodiment, the outer peripheral surface of the static contact is provided with a protrusion;

[0027] The insulating cover has a second sunken groove, which is recessed from the outer wall surface of the insulating cover toward the inner wall surface of the insulating cover along the axial direction of the static contact, and the through hole passes through the bottom surface of the second sunken groove;

[0028] Wherein, at least a portion of the protrusion is accommodated in the second sinking groove.

[0029] One embodiment of the above application has at least the following advantages or beneficial effects:

[0030] In the relay of the embodiment of the present application, the connection surface of the static contact is covered with a protective layer, which is used to connect to the conductive member. The protective layer prevents oxidation of the connection surface of the static contact, thereby improving the reliability of the electrical connection between the static contact and the conductive member.

[0031] Furthermore, the stationary contact of the embodiment of the present application has a first recessed groove and a threaded hole. The first recessed groove accommodates the melted protective layer, thus resolving the problem of the protective layer melting and flowing into the threaded hole, which could affect the reliability of the electrical connection between the stationary contact and the conductive member. Therefore, the relay of the embodiment of the present application, through the combined action of the protective layer and the first recessed groove, improves the overall reliability of the electrical connection between the stationary contact and the conductive member.

[0032] Furthermore, the insulating cover of the embodiment of the present application includes a ceramic cover and a frame piece, and the protective layer only covers the connecting surface of the static contact. When the static contact is welded to the ceramic cover, the heat generated by the welding melts the protective layer, and the protective layer will not accumulate at the contact end and affect the contact reliability of the contact.

[0033] The details of one or more embodiments of the present application are set forth in the accompanying drawings and the description below. Other features, objects, and advantages of the present application will become apparent from the description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to better describe and illustrate the embodiments and / or examples of the present application, reference may be made to one or more of the accompanying drawings. The additional details or examples used to describe the accompanying drawings should not be considered as limiting the scope of the disclosed application, the presently described embodiments and / or examples, and any of the best modes currently understood for these applications.

[0035] FIG1 is a perspective schematic diagram of a relay according to an embodiment of the present application.

[0036] FIG. 2 is a schematic diagram showing a case where the conductive member in FIG. 1 is omitted.

[0037] FIG3 shows a cross-sectional view of the stationary contact.

[0038] FIG. 4 shows a cross-sectional view along the AA section line in FIG. 2 .

[0039] The reference numerals are as follows: 100, insulating cover 101, chamber 102, through hole 110, ceramic cover 111, top wall 112, cylindrical side wall 120, frame 130, second sinking groove 140, soldering station 150, protrusion 200, static contact 201, first chamfer 202, second chamfer 210, contact end 220, connecting end 221, connecting surface 230, first sinking groove 240, threaded hole 250, protrusion 260, solder foot 270, main body 300, protective layer 400, conductive member 410, through hole DETAILED DESCRIPTION

[0040] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. It should be understood that these embodiments are provided to provide a more thorough and comprehensive understanding of the disclosure of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0042] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to the process, method, product, or apparatus.

[0043] In addition, the following will disclose embodiments of the present invention with reference to the accompanying drawings. For the purpose of clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the present invention.

[0044] Furthermore, for the sake of clutter, some conventional structures and components may be depicted in simplified schematic form in the drawings. Furthermore, some features in the drawings may be slightly enlarged or their proportions or dimensions altered to facilitate understanding and appreciation of the technical features of the present invention, but this is not intended to limit the present invention. The actual dimensions and specifications of products manufactured in accordance with the disclosure of this invention may be adjusted based on production requirements, product characteristics, and the following disclosures of this invention. This is hereby stated.

[0045] As shown in FIG. 1 and FIG. 2 , the relay according to the embodiment of the present application includes an insulating cover 100 , a static contact 200 and a conductive member 400 .

[0046] It should be noted that the relay may also include a moving contact piece, a yoke plate, a push rod assembly, a magnetic circuit part, an arc extinguishing part, etc. The above-mentioned moving contact piece, yoke plate, push rod assembly, magnetic circuit part, arc extinguishing part and other components are not the focus of discussion in this application. Therefore, in order to make the application documents concise, the connection relationship and function of the above-mentioned components will not be repeated.

[0047] The insulating cover 100 has a chamber 101 (as shown in FIG4 ) inside, and the chamber 101 is used to accommodate the movable contact piece. The insulating cover 100 also has a through hole 102 communicating with the chamber 101 .

[0048] The insulating cover 100 includes a ceramic cover 110 and a frame piece 120. The ceramic cover 110 is made of ceramic material and has a cavity 101 and a through hole 102. The frame piece 120 is connected to the opening of the ceramic cover 110. The ceramic cover 110 is connected to the yoke plate through the frame piece 120.

[0049] It is understood that the frame piece 120 can be a metal piece with an annular structure, such as an iron-nickel alloy, and one end of the frame piece 120 is connected to the opening edge of the ceramic cover 110, for example, by laser welding, brazing, resistance welding, gluing, etc. The other end of the frame piece 120 is connected to the yoke, which can also be connected by laser welding, brazing, resistance welding, gluing, etc. The frame piece 120 is provided between the ceramic cover 110 and the yoke plate to facilitate the connection between the ceramic cover 110 and the yoke plate.

[0050] The static contact 200 is confined within the through hole 102 and is fixedly connected to the insulating cover 100. The static contact 200 is used to contact the moving contact piece, thereby achieving contact closure of the relay. The static contact 200 is made of a conductive material, for example, the conductive material can be oxygen-free copper, but is not limited to this. It can be understood that the number of static contacts 200 is an even number, and the even number of static contacts 200 is arranged in pairs. The two static contacts 200 in a pair respectively contact or separate with the two ends of the moving contact piece in the length direction, one static contact 200 serves as a terminal for current inflow, and the other static contact 200 serves as a terminal for current outflow. When the number of static contacts 200 is one pair, the relay can control one circuit; when the number of static contacts 200 is two pairs, the relay can control two circuits; when the number of static contacts 200 is three pairs, the relay can control three circuits, and so on, which are not listed here one by one.

[0051] Continuing with Figure 1 , each stationary contact 200 is electrically connected to a conductive member 400 . The stationary contact 200 and the conductive member 400 can be connected via fasteners (not shown). Specifically, the stationary contact 200 has a threaded hole 240 , and the conductive member 400 has a through-hole 410 at a position corresponding to the threaded hole 240 . The fastener passes through the through-hole 410 and is screwed into the threaded hole 240 to securely connect the conductive member 400 and the stationary contact 200 .

[0052] In one embodiment, the fastener may be a screw, but is not limited thereto.

[0053] As shown in Figures 3 and 4, the static contact 200 includes a body 270 and a connecting end 220. The body 270 may be cylindrical, and the connecting end 220 is connected to one axial end of the body 270. The connecting end 220 may be disc-shaped, with the axis of the connecting end 220 coinciding with the axis of the body 270.

[0054] The main body 270 is disposed within the through hole 102 of the insulating cover 100. The connecting end 220 is located on the outer surface of the insulating cover 100 and is fixedly connected to the insulating cover 100, for example, by welding. The end of the main body 270 away from the connecting end 220 is defined as the contact end 210. The contact end 210 extends into the cavity 101 and is used to contact the movable contact piece.

[0055] The connection end 220 has a connection surface 221 on the side facing away from the insulating cover 100. In other words, the connection surface 221 is formed on the surface of the connection end 220 facing away from the main body 270. The static contact 200 also has a first sunken groove 230 and a threaded hole 240. The first sunken groove 230 is recessed from the connection surface 221 along the axial direction of the static contact 200 toward the connection end 220. The threaded hole 240 is recessed from the bottom surface of the first sunken groove 230 along the axial direction of the static contact 200 toward the connection end 220.

[0056] As shown in Figure 3, the relay of this embodiment further includes a protective layer 300, which covers the connection surface 221 and is made of a conductive material. A conductive member 400 is attached to the side of the protective layer 300 facing away from the connection surface 221. The through-hole 410 of the conductive member 400 corresponds to the position of the threaded hole 240, and is used to pass a fastener therethrough.

[0057] In the relay of the embodiment of the present application, the connection surface 221 of the static contact 200 is covered with a protective layer 300, and the static contact 200 also has a first sunken groove 230 formed by being recessed from the connection surface 221 along the axial direction of the static contact 200 toward the contact end 210, and a threaded hole 240 formed by being recessed from the bottom surface of the first sunken groove 230 along the axial direction of the static contact 200 toward the contact end 210. On the one hand, the protective layer 300 can prevent the connection surface 221 of the static contact 200 from being oxidized, thereby avoiding affecting the electrical connection between the conductive member 400 and the static contact 200 due to oxidation; in addition, the protective layer 300 only covers the connection surface 221 of the static contact 200. When the static contact 200 is welded to the ceramic cover 110, the conductive member 400 is electrically connected to the static contact 200. When the heat generated by welding melts the protective layer, the protective layer will not accumulate on the contact end 210 and affect the contact reliability of the contact; on the other hand, when the static contact 200 covered with the protective layer 300 is welded to the insulating cover 100, the heat generated by welding will melt the protective layer 300, causing the protective layer 300 to flow into the threaded hole 240, affecting the threaded connection; since the static contact 200 of the embodiment of the present application has a first sinking groove 230, the first sinking groove 230 can accommodate the melted protective layer 300, preventing the melted protective layer 300 from further flowing into the threaded hole 240, thereby avoiding the internal thread structure of the threaded hole 240 being filled with the protective layer 300 and affecting the firmness of the threaded connection.

[0058] Thus, the relay of the embodiment of the present application can solve the problem of the electrical connection reliability between the static contact 200 and the conductive member 400 being affected by oxidation of the static contact 200, and can also solve the problem of the electrical connection reliability between the static contact 200 and the conductive member 400 being affected by melting of the protective layer 300 and flowing into the threaded hole 240. Therefore, the relay of the embodiment of the present application improves the overall electrical connection reliability between the static contact 200 and the conductive member 400 through the combined action of the protective layer 300 and the first sinking groove 230.

[0059] It is understood that the conductive material of the protective layer 300 can be silver and its alloys, platinum, gold, etc., but is not limited to these materials. Any conductive material that can provide both anti-oxidation and electrical conductivity can be used. It should be noted that the anti-oxidation capability of the protective layer 300 is higher than the anti-oxidation capability of the material of the static contact 200 itself.

[0060] 3 and 4 , a first chamfer 201 is formed at the connection between the side surface of the first sinking groove 230 and the connecting surface 221 .

[0061] In one embodiment, the first chamfer 201 can form a slope between the side surface of the first sinking groove 230 and the connecting surface 221 , which is more conducive to the melted protective layer 300 flowing into the first sinking groove 230 .

[0062] A second chamfer 202 is formed at the connection between the inner wall of the threaded hole 240 and the bottom surface of the first sinking groove 230 .

[0063] In one embodiment, a second chamfer 202 is provided at the connection between the inner wall surface of the threaded hole 240 and the bottom surface of the first sinking groove 230 to prevent the formation of a sharp corner at the connection, thereby preventing the fastener from scratching the sharp corner when the fastener is screwed into the threaded hole 240.

[0064] It can be understood that the inner wall surface of the threaded hole 240 refers to the outer surface of an imaginary cylinder where the internal thread crests of the threaded hole 240 coincide with each other.

[0065] As shown in Figure 4, further, the ceramic cover 110 includes a top wall 111 and a cylindrical side wall 112, the top wall 111 has a through hole 102, and the through hole 102 passes through the top wall 111 along the thickness direction of the top wall 111; the cylindrical side wall 112 is connected to the outer periphery of the top wall 111, and the top wall 111 and the cylindrical side wall 112 form a chamber 101.

[0066] As shown in FIG4 , a protrusion 150 is provided on the inner wall surface of the top wall 111 of the insulating cover 100. The side of the protrusion 150 facing the static contact 200 is flush with the inner surface of the through hole 102. Furthermore, the protrusion 150 is annular and surrounds the outer circumference of the static contact 200.

[0067] In one embodiment, by providing a protrusion 150 on the inner wall surface of the top wall 111 , the creepage distance between the pair of static contacts 200 and between the static contacts 200 and the yoke iron plate can be increased.

[0068] Please continue to refer to Figure 4. A protrusion 250 is convexly provided on the outer peripheral surface of the static contact 200; the top wall 111 has a second sunken groove 130, and the second sunken groove 130 is recessed from the outer wall surface of the top wall 111 along the axial direction of the static contact 200 toward the inner wall surface of the top wall 111, and the through hole 102 passes through the bottom surface of the second sunken groove 130; wherein, at least part of the protrusion 250 is accommodated in the second sunken groove 130.

[0069] In one embodiment, at least part of the protrusion 250 is accommodated in the second sunken groove 130, so that the two surfaces facing each other in the axial direction of the static contact 200 of the protrusion 250 and the second sunken groove 130 are offset, thereby preventing arc splashes from passing through the two offset surfaces and splashing into the gap between the static contact 200 and the through hole 102 of the ceramic cover 110, thereby improving the insulation capacity.

[0070] It is understood that the protrusion 250 can be provided at the connection between the main body 270 and the connecting end 220. The protrusion 250 can be an annular structure and surround the outer circumference of the main body 270.

[0071] A welding platform 140 is protruded from the outer wall surface of the top wall 111 and surrounds the outer periphery of the protrusion 250 . The static contact 200 further has a welding foot 260 . The welding platform 140 is supported by the welding foot 260 and welded to the welding foot 260 .

[0072] In one embodiment, the welding foot 260 is protruded from a surface of the connection end 220 facing the main body 270 , and an outer circumference of the welding foot 260 is flush with an outer circumference of the connection end 220 , but the present invention is not limited thereto.

[0073] In summary, the relay of the embodiment of the present application has at least the following advantages and beneficial effects:

[0074] The relay of the present embodiment solves the problem of oxidation of the static contact 200 affecting the reliability of the electrical connection between the static contact 200 and the conductive member 400. Furthermore, it solves the problem of melting of the protective layer 300 and flowing into the threaded hole 240, which affects the reliability of the electrical connection between the static contact 200 and the conductive member 400. Furthermore, the protective layer 300 only covers the connection surface 221 of the static contact 200. When the static contact 200 is welded to the ceramic cover 110, the heat generated by the welding melts the protective layer, preventing the protective layer from accumulating on the contact end 210 and affecting the contact reliability.

[0075] Therefore, the relay of the embodiment of the present application improves the electrical connection reliability between the static contact 200 and the conductive member 400 and the contact reliability of the contact points as a whole through the combined effect of the protective layer 300 and the first sinking groove 230 .

[0076] It is understandable that the various embodiments / implementations provided in this application can be combined with each other without causing any contradiction, and they will not be illustrated one by one here.

[0077] In the application examples, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; "connected" can mean a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the application examples can be understood according to the specific circumstances.

[0078] In the description of the application embodiments, it should be understood that the terms "up", "down", "left", "right", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the application embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the application embodiments.

[0079] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the claimed invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0080] The above-described embodiments merely represent several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make a number of variations and improvements without departing from the concept of the present application, and these variations and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the patent application shall be based on the appended claims, and the description and drawings may be used to interpret the content of the claims.

Claims

1. A relay, characterized in that: include: An insulating cover having a chamber therein and a through hole communicating with the chamber; a stationary contact, confined within the through hole; the stationary contact having a contact end and a connection end, the contact end extending into the chamber, the connection end extending out of the outer surface of the insulating cover; the connection end having a connection surface on a side facing away from the insulating cover; and The protective layer covers the connection surface and is used for electrically connecting to the conductive member.

2. The relay according to claim 1, wherein: The protection layer is made of conductive material.

3. The relay according to claim 2, characterized in that The conductive material is silver or a silver alloy.

4. The relay according to any one of claims 1 to 3, characterized in that: Also includes: The conductive member is electrically connected to a surface of the protection layer that is away from the connection surface.

5. The relay according to any one of claims 1 to 3, characterized in that: The static contact also has a first sunken groove and a threaded hole. The first sunken groove is recessed from the connecting surface along the axial direction of the static contact toward the contact end. The threaded hole is recessed from the bottom surface of the first sunken groove along the axial direction of the static contact toward the contact end.

6. The relay according to claim 5, characterized in that: Also includes: a conductive member electrically connected to a surface of the protective layer facing away from the connection surface, the conductive member having a through hole at a position corresponding to the threaded hole; A fastener passes through the through hole and is screwed into the threaded hole to fasten the conductive member and the static contact.

7. The relay according to claim 5, characterized in that A first chamfer is formed at a connection between the groove side surface of the first sinking groove and the connecting surface.

8. The relay according to claim 5, characterized in that A second chamfer is formed at a connection between the inner wall surface of the threaded hole and the bottom surface of the first sinking groove.

9. The relay according to any one of claims 1 to 3, characterized in that: The inner wall surface of the insulating cover is provided with a protrusion.

10. The relay according to claim 9, characterized in that The protrusion is an annular structure and surrounds the outer circumference of the static contact.

11. The relay according to any one of claims 1 to 3, characterized in that: The insulating cover comprises: A ceramic cover having the cavity and the through hole; the static contact is welded to the ceramic cover; and The frame piece is connected to the opening of the ceramic cover.

12. The relay according to claim 11, wherein: A welding platform is convexly provided on the outer wall surface of the insulating cover; The static contact also has a welding foot, the welding platform is supported on the welding foot, and the welding platform is welded to the welding foot.

13. The relay according to any one of claims 1 to 3, characterized in that: The outer peripheral surface of the static contact is provided with a protrusion; The insulating cover has a second sunken groove, which is recessed from the outer wall surface of the insulating cover toward the inner wall surface of the insulating cover along the axial direction of the static contact, and the through hole passes through the bottom surface of the second sunken groove; Wherein, at least a portion of the protrusion is accommodated in the second sinking groove.

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