Insulating cover and high-voltage dc relay

Abstract

The application relates to an insulating cover and a high-voltage direct-current relay. The insulating cover comprises a cover main body and an insulating ring. The cover main body comprises a side part and a top part connected with each other. An end face of the side part away from the top part is provided with a connecting part. The connecting part is used for welding a metal part. The insulating ring is at least partially protruded from the surface of the side part, and the insulating ring is located on the inner side of the connecting part in the wall thickness direction of the side part. The cover main body is provided with a through hole used for penetrating a static contact. The through hole is located on the side of the insulating ring facing the top part. The insulating cover and the high-voltage direct-current relay of the application increase the creepage path between the static contact and the metal part by using the insulating ring, so as to improve the insulation performance.

Description

Technical Field

[0001] This application relates to the field of high voltage DC relay technology, and in particular to an insulating cover and a high voltage DC relay. Background Technology

[0002] As an electronic control device, a relay has a control system (also known as an input circuit) and a controlled system (also known as an output circuit). It is commonly used in automatic control circuits. Essentially, it is an "automatic switch" that uses a smaller current to control a larger current, and it can achieve a normally open or normally closed state through electromagnetic holding force. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] High-voltage DC relays are a type of relay. In practical applications, high-voltage DC relays often interrupt electric arcs. The energy of the electric arc is extremely high, which can easily burn the contacts, causing the contact surface to become molten. Under the magnetic force of the permanent magnet, liquid metal splashes can easily form a metal path on the inner wall of the insulating cover, leading to poor insulation. Utility Model Content

[0004] Therefore, it is necessary to provide an insulating cover and a high-voltage DC relay to address the issue of how to improve the insulation performance of high-voltage DC relays.

[0005] On one hand, this application provides an insulating cover, the insulating cover including a cover body and an insulating ring, the cover body including a connected side and a top, a connecting portion being provided on the end face of the side away from the top, the connecting portion being used for welding metal parts, the insulating ring at least partially protruding from the surface of the side, and the insulating ring being located inside the connecting portion in the wall thickness direction of the side, the cover body being provided with a through hole for passing a stationary contact, the through hole being located on the side of the insulating ring facing the top.

[0006] In the aforementioned insulating cover, the insulating cover includes a cover body and an insulating ring. Since the insulating ring is connected to the cover body and the insulating ring is located inside the connecting part in the wall thickness direction of the side part, the cover body is provided with a through hole for passing through the stationary contact. The through hole is located on the side of the insulating ring facing the top. Therefore, in the high-voltage DC relay with this insulating cover, when the connecting part is connected to a metal component (such as a metal frame welded to the connecting part) and the stationary contact is installed using the through hole, the insulating ring is located on the creepage path between the stationary contact and the metal component. This allows the insulating ring to increase the creepage path between the stationary contact and the metal component, thereby improving the insulation performance.

[0007] Furthermore, at least a portion of the insulating ring protrudes from the end face of the side portion away from the top; and / or, at least a portion of the insulating ring protrudes from the inner wall surface of the side portion. This arrangement not only increases the creepage path using the insulating ring's structure itself, but also uses the protruding structure to block arc spatter, facilitating the formation of at least one clean band along the creepage path between the insulating cover and the stationary contact and the metal component. This reduces the likelihood of a metal path forming on the inner wall of the insulating cover, thus maintaining good insulation performance. Therefore, this structural arrangement in this embodiment further improves the insulation performance of the high-voltage DC relay.

[0008] Furthermore, a groove is formed on the end face of the side portion away from the top. The groove is located inside the connecting portion in the wall thickness direction of the side portion, and the insulating ring is positioned and engaged with the groove. This structural arrangement improves the assembly stability of the insulating ring relative to the cover body by utilizing the positioning engagement between the groove and the insulating ring.

[0009] Furthermore, the groove extends along the wall thickness direction of the side portion to the inner wall surface of the side portion. Thus, when the insulating ring is assembled into the groove, the inner edge of the insulating ring can protrude from the inner wall surface of the side portion to increase the creepage path and block arc spray. Because of this structural design, the precision requirements for the protrusion of the inner edge of the insulating ring from the inner wall surface of the side portion are not high, making the installation of the insulating ring relatively simple. Moreover, this structural design allows the groove to accommodate partial protrusions of the insulating ring from its end face, resulting in diverse forms of protrusion of the insulating ring relative to the insulating cover. This not only increases the creepage path but also accommodates the assembly needs of insulating rings of different specifications.

[0010] Furthermore, the insulating ring is welded to the cover body or connected with adhesive. This structural design allows for the selection of an appropriate size insulating ring to connect to the cover body according to actual needs, thus helping the insulating cover maintain good insulation performance while meeting dimensional design requirements.

[0011] Furthermore, the cover body and the insulating ring are integrally formed. This structure is stable and eliminates the need for the process of connecting the cover body and the insulating ring, thereby improving the processing efficiency of the insulating cover.

[0012] Furthermore, both the insulating ring and the main body of the cover are made of ceramic. Ceramic materials have high heat resistance, corrosion resistance, and high insulation, thus enabling them to adapt to the high-voltage, high-temperature application environment of high-voltage DC relays.

[0013] On the other hand, this application provides a high-voltage DC relay, including a stationary contact, a metal frame, and an insulating cover as described above. The stationary contact is connected to the cover body, and the metal frame is connected to the connecting part.

[0014] In the aforementioned high-voltage DC relay, an insulating ring is connected to the main body of the insulating cover, and the insulating ring is located inside the connection part in the wall thickness direction of the side portion. Therefore, the insulating ring is located on the creepage path between the stationary contact and the metal component, thereby increasing the creepage path between the stationary contact and the metal component and improving insulation performance.

[0015] Furthermore, the high-voltage DC relay includes at least two stationary contacts, one end of which protrudes from the inner surface of the housing body, and the other end protrudes from the outer surface of the housing body. Because the two ends of the stationary contacts protrude from the inner and outer surfaces of the housing body respectively, the stationary contacts can accommodate the requirements of the moving contacts of the high-voltage DC relay for electrical connection to external circuits.

[0016] Furthermore, the through-hole is located at the top of the cover body, and the through-hole includes a first through-hole and a second through-hole. The stationary contact includes a first stationary contact and a second stationary contact. The first stationary contact passes through the first through-hole, and the second stationary contact passes through the second through-hole. Both the first stationary contact and the second stationary contact are sealed and welded to the cover body. With this structural arrangement, the ceramic cover can provide a sealed environment for the parts in contact with the first stationary contact, the second stationary contact, and the moving contact of the high-voltage DC relay.

[0017] Furthermore, the high-voltage DC relay includes a yoke assembly, with one end of the metal frame sealed and welded to the connecting portion, and the other end sealed and welded to the yoke assembly. Thus, the metal frame not only serves as a connection between the insulating cover and the yoke assembly, but also, by sealing the connecting portion and the yoke assembly to both ends of the metal frame, maintains overall sealing between the insulating cover and the yoke assembly, providing a sealed environment for the contact portion of the high-voltage DC relay.

[0018] Furthermore, the metal frame includes an annular body and a first folded edge. One end of the annular body is sealed and welded to the connecting portion via the first folded edge, and the other end is sealed and welded to the yoke assembly. In this embodiment, the first folded edge facilitates a welding connection with the connecting portion, thereby improving the connection stability and sealing between the metal frame and the connecting portion.

[0019] Furthermore, the metal frame includes an annular body and a second folded edge. One end of the annular body is sealed and welded to the connecting portion, and the other end is sealed and welded to the yoke assembly via the second folded edge. In this embodiment, the second folded edge facilitates a welding connection with the yoke assembly, thereby improving the connection stability and sealing between the metal frame and the yoke assembly.

[0020] Furthermore, the metal frame includes an annular body, a first folded edge, and a second folded edge. One end of the annular body is sealed and welded to the connecting part via the first folded edge, and the other end is sealed and welded to the yoke assembly via the second folded edge. In this embodiment, the first folded edge facilitates connection with the connecting part by welding, improving the connection stability and sealing between the metal frame and the connecting part; the second folded edge facilitates connection with the yoke assembly by welding, improving the connection stability and sealing between the metal frame and the yoke assembly, thereby enhancing the overall structural strength of the high-voltage DC relay and the sealing of the environment where the contact parts are located. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a high-voltage DC relay in one embodiment.

[0022] Figure 2 This is a partial structural cross-sectional view of a high-voltage DC relay in one embodiment.

[0023] Figure 3 This is an exploded structural diagram of the stationary contact, metal frame, and insulating cover in a high-voltage DC relay according to one embodiment.

[0024] Figure 4 This is a schematic diagram of a high-voltage DC relay in one embodiment, showing the stationary contact and the metal frame connected to an insulating cover.

[0025] Figure 5 In one embodiment, a portion of the structure of the high-voltage DC relay is along... Figure 4 A schematic diagram of the cross-sectional structure of line II in the diagram.

[0026] Figure 6 for Figure 5 A magnified view of the structure within the middle circle.

[0027] Figure 7 In another embodiment, part of the structure of the high-voltage DC relay is along Figure 4 A schematic diagram of the cross-sectional structure of line II in the diagram.

[0028] Figure 8 for Figure 7 A magnified view of the structure within the middle circle.

[0029] Figure 9 In another embodiment, part of the structure of the high-voltage DC relay follows... Figure 4 A schematic diagram of the cross-sectional structure of line II in the diagram.

[0030] Figure 10 for Figure 9 A magnified view of the structure within the middle circle.

[0031] Figure 11 In another embodiment, part of the structure of the high-voltage DC relay follows... Figure 4 A schematic diagram of the cross-sectional structure of line II in the diagram.

[0032] Figure 12 for Figure 11 A magnified view of the structure within the middle circle.

[0033] Figure 13 In another embodiment, a portion of the structure of the high-voltage DC relay follows... Figure 4 A schematic diagram of the cross-sectional structure of line II in the diagram.

[0034] Figure 14 for Figure 13 A magnified view of the structure within the middle circle.

[0035] Figure label:

[0036] 100. High-voltage DC relay; 10. Contact part; 11. First stationary contact; 12. Second stationary contact; 13. Moving contact piece; 20. Pushing mechanism; 21. Pushing base; 22. Pushing rod; 30. Magnetic circuit part; 31. Yoke assembly; 311. Yoke plate; 311a. Perforation; 312. U-shaped yoke; 32. Coil assembly; 321. Coil; 322. Coil frame; 33. Moving iron core; 34. Stationary iron core; 35. Return spring; 40. Insulating cover; 41. Cover body; 411. Side; 411a. Inner wall surface; 411b. Outer wall surface; 4111. Connecting part; 4112. Groove; 412. Top; 4121. First through hole; 4122. Second through hole; 42. Insulating ring; 50. Metal frame; 51. Ring body; 53. Second folded edge; 60. Metal shell. Detailed Implementation

[0037] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0038] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0043] Combination Figure 1 and Figure 2 As shown, this application provides a high-voltage DC relay 100 that can be applied in automatic control circuits. The high-voltage DC relay 100 includes a contact portion 10, an actuating mechanism 20, and a magnetic circuit portion 30.

[0044] The contact portion 10 includes stationary contacts and a moving contact 13. There can be two stationary contacts, namely a first stationary contact 11 and a second stationary contact 12. The two ends of the moving contact 13 correspond to the two stationary contacts (i.e., the first stationary contact 11 and the second stationary contact 12). The moving contact 13 can move closer to or further away from the two stationary contacts under the action of the pushing mechanism 20. When the moving contact 13 approaches and contacts the two stationary contacts, that is, when the moving contact 13 contacts the first stationary contact 11 and the second stationary contact 12, the first stationary contact 11 is electrically connected to the second stationary contact 12 through the moving contact 13, thereby completing the output circuit. Conversely, when the moving contact 13 separates from the two stationary contacts, the moving contact 13 disconnects the electrical connection between the first stationary contact 11 and the second stationary contact 12, thereby disconnecting the output circuit.

[0045] In some embodiments, the pushing mechanism 20 includes a pushing base 21 and a pushing rod 22 connected to each other. A movable contact 13 is disposed on the pushing base 21, and the pushing rod 22 is used to move the pushing base 21 closer to or away from the stationary contact when it moves, so that the movable contact 13 on the pushing base 21 comes into contact with or separates from the stationary contact, thereby achieving the purpose of electrically connecting or disconnecting the movable contact 13 from the stationary contact, so as to meet the need to connect or disconnect the automatic control circuit connected to the high-voltage DC relay 100.

[0046] In this embodiment, the high-voltage DC relay 100 includes an insulating cover 40. The insulating cover 40 includes a cover body 41, which includes a side portion 411 and a top portion 412 connected to each other. The moving contact 13 is placed inside the insulating cover 40, and the stationary contact is fixed relative to the insulating cover 40.

[0047] In some embodiments, the top 412 is provided with a through hole for the stationary contact to pass through, so that the side of the stationary contact facing away from the moving contact 13 protrudes to the outside of the insulating cover 40. In other embodiments, the stationary contact may also pass through the side 411, in which case the side 411 is provided with a corresponding through hole to accommodate the placement of the stationary contact. The placement position of the stationary contact on the cover body 41 is not limited here.

[0048] In some embodiments, the high-voltage DC relay 100 includes at least two stationary contacts, each mounted on the top 412 of the housing body 41. One end of each stationary contact protrudes from the inner surface of the housing body 41 to accommodate contact or disconnection with the moving contact 13. The other end of each stationary contact protrudes from the outer surface of the housing body 41 to facilitate connection between the stationary contact and the peripheral circuitry of the high-voltage DC relay 100.

[0049] The number of through holes can be configured according to the number of stationary contacts.

[0050] For example. Figures 3 to 5 As shown, in an embodiment where the contact portion 10 includes two stationary contacts, the top 412 of the cover body 41 is provided with a first through hole 4121 and a second through hole 4122. The first stationary contact 11 passes through the first through hole 4121, and the second stationary contact 12 passes through the second through hole 4122. Both the first stationary contact 11 and the second stationary contact 12 are sealed and welded to the cover body 41.

[0051] In this embodiment, since the first stationary contact 11 passes through the first through hole 4121 and the second stationary contact 12 passes through the second through hole 4122, the first stationary contact 11 and the second stationary contact 12 can form a connection end on the outside of the cover body 41 to meet the connection requirements between the output circuit containing the first stationary contact 11 and the second stationary contact 12 and the external controlled object. Simultaneously, since the first stationary contact 11 and the second stationary contact 12 respectively pass through the first through hole 4121 and the second through hole 4122 into the interior of the insulating cover 40, they correspond to the moving contact piece 13 located inside the insulating cover 40. Since both the first stationary contact 11 and the second stationary contact 12 are sealed and welded to the insulating cover 40, the contact portion 10 is in a sealed environment.

[0052] Combination Figure 2 As shown, a connecting portion 4111 is provided on the end face of the side portion 411 away from the top 412. The connecting portion 4111 is used for welding metal parts. In other words, the part of the side portion 411 used for welding with metal parts is the connecting portion 4111.

[0053] In some embodiments, the high-voltage DC relay 100 includes a metal frame 50 and a yoke assembly 31. One end of the metal frame 50 is sealed and welded to the connection portion 4111, and the other end is sealed and welded to the yoke assembly 31. Thus, the metal frame 50 connects the cover body 41 and the yoke assembly 31, and because they are sealed together, the overall airtightness of the space enclosed by the insulating cover 40 can be maintained.

[0054] It should be noted that the metal frame 50 has a ring-shaped structure. As a metal component connected to the cover body 41, the ring-shaped metal frame 50 facilitates a sealed connection with the connection portion 4111 of the cover body 41.

[0055] It should be noted that the annular body 51 can be a smooth cylindrical structure, or it can consist of multiple cylindrical structures of different sizes, which can be connected by bending portions. The shape of the annular body 51 is not limited here, as long as it meets the sealing connection requirements with the cover body 41.

[0056] For example, in some embodiments, the metal frame 50 includes an annular body 51 and a first flange (not shown). One end of the annular body 51 is sealed and welded to the connecting portion 4112 via the first flange, and the other end is sealed and welded to the yoke assembly 31. In this embodiment, the first flange facilitates a welded connection with the connecting portion 4112, thereby improving the connection stability and sealing between the metal frame 50 and the connecting portion 4112.

[0057] The first folded edge can be one end of the ring body 51 facing the cover body 41, and bends inward relative to the ring body 51.

[0058] For example, combining Figures 4 to 6 As shown, the metal frame 50 includes an annular body 51 and a second folded edge 53. One end of the annular body 51 is sealed and welded to the connecting part 4112, and the other end is sealed and welded to the yoke assembly 31 via the second folded edge 53. In this embodiment, the second folded edge 53 allows for a welded connection with the yoke assembly 31, thereby improving the welding stability and sealing performance between the two.

[0059] The second folded edge 53 can be one end of the back cover body 41 connected to the annular body 51, and bends outward relative to the annular body 51.

[0060] It should be noted that in some embodiments, the metal frame 50 includes both a first folded edge and a second folded edge 53. Specifically, the metal frame 50 includes an annular body 51, a first folded edge, and a second folded edge 53. One end of the annular body 51 is sealed and welded to the connecting portion 4112 via the first folded edge, and the other end is sealed and welded to the yoke assembly 31 via the second folded edge 53.

[0061] In the above embodiments, the first folded edge may be connected to one end of the annular body 51 and bent inward relative to the annular body 51; the second folded edge 53 may be connected to one end of the back cover body 41 of the annular body 51 and bent outward relative to the annular body 51.

[0062] The structure of the metal frame 50 will not be described in detail here.

[0063] It should be noted that the yoke assembly 31 is part of the magnetic circuit portion 30. In some embodiments, the yoke assembly 31 includes a yoke plate 311 and a U-shaped yoke 312. The yoke plate 311 is connected to both ends of the U-shaped yoke 312 to enclose and form an installation space.

[0064] In this embodiment, the cover body 41 is sealed to the side of the yoke plate 311 facing away from the moving iron core 33 by a metal frame 50. That is, one end of the metal frame 50 is sealed to the connecting part 4111 of the cover body 41, and the other end is sealed to the yoke plate 311.

[0065] In some implementations, combined again Figure 1 and Figure 2 As shown, the magnetic circuit section 30 includes a coil assembly 32, a moving iron core 33, and a stationary conductor magnet.

[0066] The coil assembly 32 may be disposed within the mounting space enclosed by the yoke assembly 31. The coil assembly 32 includes a coil 321 and a coil holder 322. The coil 321 is wound around the coil holder 322 and is used to generate an electromagnetic field when energized. The coil holder 322 has mounting holes.

[0067] The moving iron core 33 is disposed in the mounting hole and connected to the end of the push rod 22 away from the push base 21. It attracts a stationary magnet in the electromagnetic field generated by the energization of the coil 321, thereby enabling the moving iron core 33 to move within the mounting hole in the direction closest to the stationary magnet.

[0068] It should be noted that the stationary magnet can be the yoke plate 311 of the yoke assembly 31. In some embodiments, the stationary magnet may include other magnetically conductive structures in addition to the yoke plate 311. For example, the stationary magnet may include the yoke plate 311 and a stationary iron core 34 disposed on the yoke plate 311, so as to enhance the attraction force between the stationary iron core 34 and the moving iron core 33, so that the moving iron core 33 can obtain a greater driving force, so that the moving iron core 33 has sufficient power to drive the push seat 21 closer to the stationary contact via the push rod 22, so that the moving contact piece 13 on the push seat 21 contacts or separates from the stationary contact. The structure of the stationary magnet is not limited here, as long as the moving iron core 33 can magnetically attract the stationary magnet when the coil 321 is energized, so as to drive the moving contact piece 13 to contact or separate from the stationary contact.

[0069] Continue reading Figure 2 As shown, in some embodiments, the moving contact 13 and the push seat 21 are connected, and both are disposed within the cover body 41. The yoke plate 311 has a through hole 311a through which the push rod 22 can pass. In this embodiment, the push rod 22 passes through the through hole 311a of the yoke plate 311, and the push seat 21 and the moving iron core 33, which are connected to both ends of the push rod 22, are located on both sides of the yoke plate 311. Specifically, one end of the push rod 22 is connected to the push seat 21, and the other end passes through the through hole 311a through the yoke plate 311 to connect with the moving iron core 33. Since the push rod 22 passes through the through hole 311a and is connected between the push seat 21 and the moving iron core 33, the push rod 22 can transmit the power of the moving iron core 33 moving in the mounting hole of the coil frame 322 to the push seat 21, so that the push seat 21, carrying the moving contact 13, contacts or separates from the two stationary contacts.

[0070] The inventors discovered that in practical applications, the high-voltage DC relay 100 often interrupts the electric arc. The electric arc energy is extremely high, which can easily burn the contacts and cause the contact surface to become molten. Under the magnetic force of the permanent magnet, liquid metal splashes are formed, which can easily form a metal path on the inner wall of the insulating cover 40, leading to poor insulation.

[0071] Therefore, after further research, the inventors proposed a technical solution that could improve the problem.

[0072] Specifically, in combination Figure 5 and Figure 6 As shown, the insulating cover 40 includes an insulating ring 42, which at least partially protrudes from the surface of the side portion 411. The insulating ring 42 may at least partially protrude from the inner wall surface 411a of the side portion 411, or it may at least partially protrude from the end face of the side portion 411. The position of the insulating ring 42 is not limited here.

[0073] The insulating ring 42 is located inside the connecting portion 4111 in the wall thickness direction of the side portion 411 (i.e., the direction from the outer wall surface 411b to the inner wall surface 411a). Understandably, the inner side of the connecting portion 4111 is the side of the connecting portion 4111 facing the inner wall surface 411a. The through hole for the stationary contact is located on the side of the insulating ring 42 facing the top 412. Therefore, when connecting metal components (such as the metal frame 50 welded to the connecting portion 4111) using the connecting portion 4111 and setting the stationary contact using the through hole, the insulating ring 42 is located on the creepage path between the stationary contact and the metal frame 50. This allows the insulating ring 42 to increase the creepage path between the stationary contact and the metal frame 50, thereby improving insulation performance.

[0074] Furthermore, at least a portion of the insulating ring 42 protrudes from the end face of the side portion 411 away from the top 412. Thus, the insulating ring 42 not only increases the creepage path between the stationary contact and the metal frame 50, but the protruding portion of the insulating ring 42 also blocks arc spatter. This results in at least one clean band (i.e., an area free from arc spatter) forming on the creepage path between the stationary contact and the metal frame 50 of the insulating cover 40, reducing the likelihood of metal pathways forming on the inner wall of the insulating cover 40 and thus maintaining good insulation performance. Therefore, this structural arrangement in this embodiment further improves the insulation performance of the high-voltage DC relay 100.

[0075] Combination Figure 7 and Figure 8 As shown, in some embodiments, the cover body 41 and the insulating ring 42 are integrally formed. This structure is stable and eliminates the process of connecting the cover body 41 and the insulating ring 42, thereby improving the processing efficiency of the insulating cover 40.

[0076] It should be noted that the protruding design of the insulating ring 42 is not limited to the above-mentioned situation.

[0077] For example, combining Figure 9 and Figure 10 As shown, in some embodiments, at least a portion of the insulating ring 42 protrudes from the inner wall surface 411a of the side portion 411. In this embodiment, the insulating ring 42 can still increase the creepage path between the stationary contact and the metal frame 50, and the portion of the insulating ring 42 protruding from the inner wall surface 411a of the side portion 411 further reduces the probability of a metal path forming on the inner wall of the insulating cover 40 by blocking arc spray, thereby improving the insulation performance of the high-voltage DC relay 100.

[0078] In some embodiments, the insulating ring 42 and the cover body 41 can be welded to each other or connected by adhesive. This structural arrangement allows for the selection of an appropriate size insulating ring 42 to connect with the cover body 41 according to actual needs, thereby helping the insulating cover 40 maintain good insulation performance while meeting dimensional design requirements.

[0079] Combination Figure 11 and Figure 12 As shown, in some embodiments, a groove 4112 is formed on the end face of the side portion 411 away from the top 412. The groove 4112 is located inside the connecting portion 4111 in the wall thickness direction of the side portion 411, and the insulating ring 42 is positioned and engaged with the groove 4112. In this embodiment, the positioning and engagement between the groove 4112 and the insulating ring 42 can improve the assembly stability of the insulating ring 42 relative to the cover body 41.

[0080] It should be noted that the groove 4112 may only extend to the end face of the side portion 411 away from the top 412. In this case, after the insulating ring 42 is positioned and engaged with the groove 4112, a part of the structure of the insulating ring 42 is embedded in the groove 4112, and a part of the structure extends out of the groove 4112 (i.e. protrudes from the end face). Thus, the insulating ring 42 can increase the creepage path and also block the arc spray, thereby improving the insulation performance of the high voltage DC relay 100.

[0081] In some embodiments, the groove 4112 extends along the wall thickness direction of the side portion 411 to the inner wall surface 411a of the side portion 411. Thus, when the insulating ring 42 is assembled into the groove 4112, the inner edge of the insulating ring 42 can protrude from the inner wall surface 411a of the side portion 411 to increase the creepage path and block arc spray. Because of this structural arrangement, the precision requirement for the protrusion of the inner edge of the insulating ring 42 from the inner wall surface 411a of the side portion 411 is not high, thus simplifying the installation of the insulating ring 42. Understandably, in this embodiment, the groove 4112 can also accommodate partial protrusions of the insulating ring 42 from its end face, allowing for diverse forms of protrusion of the insulating ring 42 relative to the insulating cover 40, which both increases the creepage path and accommodates the assembly needs of insulating rings 42 of different specifications.

[0082] It should be noted that, in combination Figure 13 and Figure 14 As shown, in an embodiment where at least a portion of the insulating ring 42 protrudes from the inner wall surface 411a of the side portion 411, the cover body 41 and the insulating ring 42 can be integrally formed. This structure is stable and eliminates the need for connecting the cover body 41 and the insulating ring 42, thereby improving the processing efficiency of the insulating cover 40.

[0083] In this embodiment, both the cover body 41 and the insulating ring 42 are made of insulating materials. Insulating materials include, but are not limited to, ceramics and plastics. In some embodiments, both the insulating ring 42 and the cover body 41 are made of ceramic. Ceramic materials have high heat resistance, corrosion resistance, and high insulation, thus enabling them to adapt to the high-voltage, high-temperature application environment of the high-voltage DC relay 100.

[0084] The connecting part 4111 may be metallized to facilitate the welding of the metal frame 50 to the connecting part 4111. The welding method includes, but is not limited to, brazing.

[0085] It should be noted that the parts of the high-voltage DC relay 100 not covered here can be the same as or can be implemented using existing technology, and are not limited here.

[0086] For example, see Figure 2As shown, in some embodiments, the high-voltage DC relay 100 further includes a metal housing 60, which is a bottomed cylindrical shape. The open end of the metal housing 60 is sealed to the side of the yoke plate 311 facing away from the insulating cover 40. The perforation 311a on the yoke plate 311 corresponds to the interior of the metal housing 60, thereby sealing the area around the perforation 311a with the metal housing 60. Thus, even if the space enclosed by the insulating cover 40 is connected to the space on the other side of the yoke plate 311 through the perforation 311a, with the metal housing 60 sealing the area around the perforation 311a, the space enclosed by the insulating cover 40 is connected to the space enclosed by the metal housing 60 through the perforation 311a, and the overall system exhibits good sealing performance.

[0087] The sealing connection between the metal shell 60 and the yoke plate 311 includes, but is not limited to, welding or glue connection.

[0088] It should be noted that in some embodiments, the metal shell 60 not only serves a sealing function, but can also guide the movement of the moving iron core 33 to improve its movement stability. For example, the peripheral wall of the moving iron core 33 slides in contact with the inner wall of the metal shell 60, so that the moving iron core 33 is less likely to wobble in the direction perpendicular to the push rod 22 when it moves, thereby improving its movement stability.

[0089] In an embodiment where the high-voltage DC relay 100 includes a metal housing 60, at least a portion of the structure of the metal housing 60 is located within the mounting hole of the coil frame 322. That is, after the coil 321 is wound around the coil frame 322, it is fitted together with the coil frame 322 onto the outside of the metal housing 60, allowing the coil 321 to magnetize the moving iron core 33 located within the metal housing 60 when energized. Alternatively, in an embodiment where the stationary conductor includes a stationary iron core 34, the magnetic lines of force generated by the energized coil 321 can also be transmitted to the stationary iron core 34 via the yoke plate 311, causing the moving iron core 33 to magnetically attract the stationary iron core 34. This, in turn, drives the push rod 22 to move the push seat 21 toward the side where the first stationary contact 11 and the second stationary contact 12 are located. Subsequently, the moving contact piece 13 contacts the first stationary contact 11 and the second stationary contact 12, electrically connecting the first stationary contact 11 and the second stationary contact 12 using the moving contact piece 13.

[0090] Continue reading Figure 2 As shown, in some embodiments, a return spring 35 is provided between the yoke plate 311 and the moving iron core 33.

[0091] In this embodiment, when the coil 321 is energized, the moving iron core 33 attracts the yoke plate 311 in the electromagnetic field generated by the coil 321, thereby overcoming the elastic force of the return spring 35 and moving towards the yoke plate 311. In this way, the push rod 22 drives the push seat 21 to move towards the stationary contacts, causing the moving contact piece 13 on the push seat 21 to contact the two stationary contacts, thus establishing an electrical connection between the two stationary contacts using the moving contact piece 13.

[0092] When the coil 321 is de-energized, the moving iron core 33 moves away from the yoke plate 311 under the drive of the return spring 35. In this way, the moving iron core 33 moves the push seat 21 away from the stationary contact via the push rod 22, so that the moving contact piece 13 separates from the two stationary contacts, thereby breaking the electrical contact.

[0093] Thus, the opening and closing of the high-voltage DC relay 100 can be controlled by energizing the coil 321, so as to enable the high-voltage DC relay 100 to conduct or disconnect the automatic control circuit to which it is connected. That is, the high-voltage DC relay 100 plays the role of a "switch" in the automatic control circuit.

[0094] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An insulating cover, characterized in that, The insulating cover includes a cover body and an insulating ring. The cover body includes a connected side and a top. A connecting portion is provided on the end face of the side away from the top. The connecting portion is used for welding metal parts. The insulating ring at least partially protrudes from the surface of the side and is located inside the connecting portion in the wall thickness direction of the side. The cover body is provided with a through hole for passing a stationary contact. The through hole is located on the side of the insulating ring facing the top.

2. The insulating cover according to claim 1, characterized in that, At least a portion of the insulating ring protrudes from the end face of the side portion away from the top. And / or, at least a portion of the insulating ring protrudes from the inner wall surface of the side portion.

3. The insulating cover according to claim 1 or 2, characterized in that, A groove is formed on the end face of the side portion away from the top. The groove is located inside the connecting portion in the wall thickness direction of the side portion, and the insulating ring is positioned and engaged with the groove.

4. The insulating cover according to claim 3, characterized in that, The groove extends along the wall thickness direction of the side portion to the inner wall surface of the side portion.

5. The insulating cover according to claim 1 or 2, characterized in that, The insulating ring is welded to the cover body or connected by adhesive, or the cover body and the insulating ring are integrally formed.

6. The insulating cover according to claim 5, characterized in that, Both the insulating ring and the cover body are made of ceramic.

7. A high-voltage DC relay, characterized in that, It includes a stationary contact, a metal frame, and an insulating cover as described in any one of claims 1 to 6, wherein the stationary contact is connected to the cover body, and the metal frame is connected to the connecting portion.

8. The high-voltage DC relay according to claim 7, characterized in that, The high-voltage DC relay includes at least two stationary contacts, one end of which protrudes from the inner surface of the cover body and the other end protrudes from the outer surface of the cover body.

9. The high-voltage DC relay according to claim 8, characterized in that, The through hole is provided at the top of the cover body. The through hole includes a first through hole and a second through hole. The stationary contact includes a first stationary contact and a second stationary contact. The first stationary contact passes through the first through hole, and the second stationary contact passes through the second through hole. Both the first stationary contact and the second stationary contact are sealed and welded to the cover body.

10. The high-voltage DC relay according to any one of claims 7 to 9, characterized in that, The high-voltage DC relay includes a yoke assembly, with one end of the metal frame sealed and welded to the connection part, and the other end sealed and welded to the yoke assembly.

11. The high-voltage DC relay according to claim 10, characterized in that, The metal frame includes an annular body and a first folded edge. One end of the annular body is sealed and welded to the connecting part through the first folded edge, and the other end is sealed and welded to the yoke assembly. Alternatively, the metal frame includes an annular body and a second folded edge, one end of the annular body is sealed and welded to the connecting part, and the other end is sealed and welded to the yoke assembly through the second folded edge; Alternatively, the metal frame includes an annular body, a first folded edge, and a second folded edge. One end of the annular body is sealed and welded to the connecting portion through the first folded edge, and the other end is sealed and welded to the yoke assembly through the second folded edge.

Images