relay

Abstract

This application discloses a relay, including a sealed housing, a contact assembly, and an arc-extinguishing assembly. The contact assembly includes a moving contact and two stationary contacts. The stationary contacts are mounted on the sealed housing, and the moving contact is movably disposed within the sealed housing for contacting or separating from the two stationary contacts. The arc-extinguishing assembly is disposed within the sealed housing and surrounding the contact assembly, for extinguishing the arc generated during the contact and separation of the moving contact and the stationary contacts. The arc-extinguishing assembly includes a plurality of arc-extinguishing grids spaced apart along the movement direction of the moving contact, with gaps between adjacent arc-extinguishing grids. An airflow channel communicating with the gaps exists between the arc-extinguishing assembly and the inner wall surface of the sealed housing.

Description

Technical Field

[0001] This application relates to the field of electrical control device technology, and more specifically, to a relay. Background Technology

[0002] A relay is an electronic control device that has a control system (also known as an input circuit) and a controlled system (also known as an output circuit), and is commonly used in automatic control circuits. Essentially, a relay is an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays a role in automatic adjustment, safety protection, and circuit switching in circuits.

[0003] In related technologies, electric arcs are easily generated between the moving and stationary contacts of a relay during contact and separation. If the arcs are not extinguished in time, they can easily burn the moving and stationary contacts, affecting their electrical durability. Summary of the Invention

[0004] This application provides a relay to solve the problem in related technologies where arcing erodes the moving and stationary contacts, affecting electrical durability.

[0005] The relay in this application embodiment includes:

[0006] Sealed housing;

[0007] A contact assembly includes a movable contact piece and two stationary contacts. The stationary contacts are mounted on the sealed housing, and the movable contact piece is movably disposed within the sealed housing for contacting or separating from the two stationary contacts.

[0008] An arc-extinguishing assembly is disposed within the sealed housing and located around the contact assembly, for extinguishing the arc generated during the contact and separation of the moving contact and the stationary contact; the arc-extinguishing assembly includes a plurality of arc-extinguishing grids arranged at intervals along the movement direction of the moving contact, with gaps between adjacent arc-extinguishing grids, and an airflow channel communicating with the gaps between the arc-extinguishing assembly and the inner wall surface of the sealed housing.

[0009] According to some embodiments of this application, the relay includes two arc-extinguishing components, which are arranged at intervals along the arrangement direction of the two stationary contacts of the contact component; the moving contact is located between the two arc-extinguishing components.

[0010] According to some embodiments of this application, the sealing housing includes an insulating cover made of ceramic material, the stationary contact is mounted on the insulating cover, the moving contact and the arc extinguishing assembly are disposed inside the insulating cover, and the airflow channel is formed between the arc extinguishing assembly and the inner wall surface of the insulating cover.

[0011] According to some embodiments of this application, the insulating cover has the same number of through holes as the stationary contacts, and the through holes penetrate the inner and outer wall surfaces of the insulating cover;

[0012] The stationary contact is inserted into the through hole and welded to the insulating cover.

[0013] According to some embodiments of this application, the sealing housing further includes a frame, a yoke plate, and a metal cover. The insulating cover is connected to one side surface of the yoke plate in the thickness direction via the frame, and the metal cover is connected to the other side surface of the yoke plate in the thickness direction. The yoke plate has a through hole that penetrates the yoke plate along the thickness direction and communicates with the cavity enclosed by the insulating cover and the cavity enclosed by the metal cover, respectively.

[0014] According to some embodiments of this application, the insulating cover and the frame, the frame and the yoke plate, and the metal cover and the yoke plate are all connected by welding.

[0015] According to some embodiments of this application, the stationary contact of the contact assembly is provided with a first arc guide plate at one end near the moving contact plate. The first arc guide plate extends from the stationary contact towards the arc extinguishing assembly to guide the electric arc toward the arc extinguishing assembly.

[0016] According to some embodiments of this application, the first arc guide plate and the stationary contact are either an integral structure or separate structures.

[0017] According to some embodiments of this application, the moving contact piece is provided with second arc guide pieces at both ends in the length direction. The second arc guide pieces extend from the moving contact piece toward the arc extinguishing component to guide the electric arc toward the arc extinguishing component.

[0018] According to some embodiments of this application, the second arc guide plate and the moving contact plate are either an integral structure or separate structures.

[0019] According to some embodiments of this application, the number of contact components is multiple;

[0020] The relay further includes a push rod component and a coil assembly. The push rod component is movably disposed within the sealed housing. The movable contact pieces of the plurality of contact components are mounted on the push rod component. The coil assembly is used to drive the push rod component to move.

[0021] According to some embodiments of this application, the sealed housing is also filled with arc-quenching gas.

[0022] An embodiment of the above application has at least the following advantages or beneficial effects:

[0023] The relay of this application embodiment, by providing an arc-extinguishing component around the contact components, can promptly extinguish the electric arc generated by the moving contact and stationary contact during the closing and opening process. On the one hand, it prevents the electric arcs generated by adjacent contact components from merging and forming a longer arc; on the other hand, timely extinguishing of the arc can effectively prevent the arc from burning the moving contact and stationary contact, thereby extending the service life of the relay; furthermore, the arc-extinguishing component is located inside the insulating cover rather than outside the insulating cover, which can reduce the size of the relay and is beneficial for miniaturization.

[0024] Furthermore, multiple arc-extinguishing grids can "cut" the electric arc into multiple shorter arc segments, which is beneficial for arc extinguishing and significantly improves the overload breaking capacity of the relay, achieving the breaking effect for high voltage and high current. Moreover, because there is an airflow channel communicating with the gap between the arc-extinguishing assembly and the inner wall of the sealed housing, gas can pass through this channel. When the arc enters the arc-extinguishing assembly, the gas in the gap between adjacent arc-extinguishing grids can be discharged into the airflow channel, allowing the arc to enter the arc-extinguishing assembly more quickly, thus lengthening the arc more rapidly. While "cutting" the arc, it also cools the arc, achieving the purpose of extinguishing the arc. Attached Figure Description

[0025] Figure 1 The diagram shown is an exploded view of a relay according to an embodiment of this application.

[0026] Figure 2 The diagram shown is a perspective view of a relay according to an embodiment of this application.

[0027] Figure 3 The diagram shows along Figure 2 A cross-sectional view along section line AA.

[0028] Figure 4 What is shown is Figure 3 A magnified view of point X1 in the middle.

[0029] The reference numerals in the attached figures are explained as follows:

[0030] 100. Sealed housing

[0031] 110. Insulating cover

[0032] 111. Top Wall

[0033] 1111, Through Hole

[0034] 112. Sidewall

[0035] 120. Frame piece

[0036] 130. Yoke plate

[0037] 140. Metal Cover

[0038] 200. Contact components

[0039] 210. Stationary contact

[0040] 220. Moving contact plate

[0041] 300. Arc extinguishing assembly

[0042] 310. Arc-quenching grid

[0043] 410. First guide arc plate

[0044] 420. Second guide arc plate

[0045] 500. Coil Assembly

[0046] 600. Push rod components

[0047] 710. Gap

[0048] 720. Airflow Channel

[0049] D1, First Direction

[0050] D2, Second Direction

[0051] D3. Third direction Detailed Implementation

[0052] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0053] It is understood that the terms "comprising" and "having," and any variations thereof, in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to these processes, methods, products, or devices.

[0054] like Figure 1As shown, the relay of this embodiment includes a sealed housing 100, a contact assembly 200, a push rod member 600, and a coil assembly 500. The push rod member 600 is movably disposed within the sealed housing 100, and the coil assembly 500 is configured to drive the push rod member 600 to move in response to an input signal. The contact assembly 200 includes a moving contact 220 and two stationary contacts 210. The stationary contacts 210 are mounted on the sealed housing 100, and the moving contact 220 is mounted on the push rod member 600 for contacting or separating from the two stationary contacts 210 to realize the closing or opening of the relay. When the relay is in the closed state, the moving contact 220 is in contact with the stationary contacts 210; when the relay is in the open state, the moving contact 220 is separated from the stationary contacts 210.

[0055] Please continue reading. Figure 1 The sealed housing 100 may include an insulating cover 110, a frame plate 120, a yoke plate 130, and a metal cover 140. The insulating cover 110 and the frame plate 120 are located on one side of the thickness direction of the yoke plate 130, and the metal cover 140 is located on the other side of the thickness direction of the yoke plate 130. The stationary contact 210 is mounted on the insulating cover 110, and the movable contact 220 is movably disposed within the cavity enclosed by the insulating cover 110.

[0056] The insulating cover 110 may be made of ceramic material and is connected to one side of the yoke plate 130 in the thickness direction via a frame 120, while the metal cover 140 is connected to the other side of the yoke plate 130 in the thickness direction.

[0057] As an example, the frame piece 120 can be a ring-shaped metal component, such as one made of an iron-nickel alloy. One end of the frame piece 120 is connected to the opening edge of the insulating cover 110, and the other end is connected to the yoke plate 130. The frame piece 120 is provided between the insulating cover 110 and the yoke plate 130 to facilitate the connection between the insulating cover 110 and the yoke plate 130.

[0058] The yoke plate 130 has a perforation (not shown in the figure) that extends through the yoke plate 130 along its thickness direction and communicates with both the cavity enclosed by the insulating cover 110 and the cavity enclosed by the metal cover 140. Specifically, the cavity enclosed by the insulating cover 110 communicates with the cavity enclosed by the metal cover 140 through the perforation. The push rod member 600 is movably inserted into the perforation, and the coil assembly 500 is fitted around the outer periphery of the metal cover 140.

[0059] In one embodiment, the insulating cover 110 is connected to the frame 120, the frame 120 is connected to the yoke plate 130, and the metal cover 140 is connected to the yoke plate 130 by welding.

[0060] like Figure 3As shown, the insulating cover 110 includes a top wall 111 and a side wall 112, with the side wall 112 located around a plurality of contact assemblies 200. The top wall 111 is fitted with a stationary contact 210. One end of the side wall 112 is connected to the edge of the top wall 111, and the other end of the side wall 112 is connected to the yoke plate 130 via a frame plate 120.

[0061] The sidewall 112 can be a rectangular ring structure, a circular ring structure, or a ring structure of other shapes. This application does not make any special limitation on this.

[0062] In one embodiment, the top wall 111 of the insulating cover 110 has a through hole 1111 that penetrates the inner and outer wall surfaces of the top wall 111. The stationary contact 210 passes through the through hole 1111 and is welded to the insulating cover 110.

[0063] The number of contact components 200 can be one or more. When there are multiple contact components 200, the moving contact pieces 220 of the multiple contact components 200 are mounted on the push rod member 600, and the two stationary contacts 210 of each contact component 200 can be electrically connected to the load, so that each contact component 200 can control the load circuit, and thus one relay can control multiple loads at the same time, thereby simplifying the number of electrical devices in the control circuit and facilitating miniaturization.

[0064] In addition, multiple moving contacts 220 are mounted on the same push rod component 600, and each moving contact 220 corresponds to a pair of stationary contacts 210. When the push rod component 600 moves, multiple moving contacts 220 move simultaneously, thereby achieving the effect of "single-drive multiple-action", which is conducive to the miniaturization and integration of relay size, and at the same time reduces the cost of the product to a certain extent.

[0065] In one embodiment, when there are two contact components 200, the two contact components 200 are used to control two sets of conductive circuits respectively. When the two sets of conductive circuits are connected in series, the relay of this embodiment can achieve series voltage division, which is more conducive to arc breaking; when the two sets of conductive circuits are connected in parallel, a parallel control circuit can be formed; in addition, one of the stationary contacts 210 of one contact component 200 can be electrically connected to one of the stationary contacts 210 of the other contact component 200, while the remaining two stationary contacts 210 are respectively connected to the positive and negative terminals of the load, thus achieving series voltage division, which is beneficial to arc breaking.

[0066] For ease of explanation, the arrangement direction of the two stationary contacts 210 of the contact assembly 200 is defined as the first direction D1, and the movement direction of the moving contact 220 is defined as the second direction D2. The first direction D1 is perpendicular to the second direction D2, and the direction that is perpendicular to both the first direction D1 and the second direction D2 is defined as the third direction D3. That is, the first direction D1, the second direction D2 and the third direction D3 are mutually perpendicular.

[0067] In this embodiment of the application, a plurality of contact components 200 are arranged along a third direction D3.

[0068] like Figures 2 to 4 As shown, the relay also includes an arc-extinguishing component 300, which is disposed inside the insulating cover 110 of the sealed housing 100 and located around the contact component 200, for extinguishing the arc generated during the contact and separation of the moving contact 220 and the stationary contact 210.

[0069] In this embodiment, by providing an arc-extinguishing component 300 around the contact component 200, the electric arc generated by the moving contact 220 and the stationary contact 210 during the closing and opening process can be extinguished in a timely manner. On the one hand, this avoids the electric arcs generated by adjacent contact components 200 from coalescing into a longer arc; on the other hand, timely extinguishing of the arc can effectively prevent the arc from burning the moving contact 220 and the stationary contact 210, thereby extending the service life of the relay; furthermore, the arc-extinguishing component 300 is located inside the insulating cover 110 instead of outside the insulating cover 110, which can reduce the size of the relay and is beneficial for miniaturization.

[0070] The arc-extinguishing assembly 300 includes a plurality of arc-extinguishing grid plates 310 spaced apart along the movement direction (second direction D2) of the movable contact plate 220. A gap 710 is provided between adjacent arc-extinguishing grid plates 310, and an airflow channel 720 communicating with the gap 710 is provided between the arc-extinguishing assembly 300 and the inner wall surface of the sealing housing 100. In one embodiment, the airflow channel 720 is formed between the arc-extinguishing assembly 300 and the inner wall surface of the side wall 112 of the insulating cover 110.

[0071] In this embodiment, multiple arc-extinguishing grid plates 310 can "cut" the electric arc into multiple shorter arc segments, which is beneficial for arc extinguishing and significantly improves the overload breaking capacity of the relay, achieving the breaking effect of high voltage and high current. Furthermore, since there is an airflow channel 720 communicating with the gap 710 between the arc-extinguishing assembly 300 and the inner wall of the sealing housing 100, this airflow channel 720 allows gas to pass through. When the electric arc enters the arc-extinguishing assembly 300, the gas in the gap 710 between adjacent arc-extinguishing grid plates 310 can be discharged into the airflow channel 720, allowing the electric arc to enter the arc-extinguishing assembly 300 more quickly, thereby lengthening the arc more rapidly. While "cutting" the electric arc, the arc-extinguishing grid plates 310 can also cool the arc, achieving the purpose of extinguishing the arc.

[0072] Furthermore, the relay in this embodiment uses a sealed housing 100, which avoids the problem of changes in contact resistance between the moving contact 220 and the stationary contact 210 due to the influence of external ambient air. For example, increased contact resistance due to oxidation of the moving and stationary contacts can lead to excessive heat generation in the relay contacts under load, resulting in overheating and burnout of the application equipment.

[0073] In one embodiment, the arc-extinguishing grid 310 can be made of iron. The iron arc-extinguishing grid 310 can attract the electric arc, thereby facilitating the absorption of the electric arc and allowing the electric arc to enter the arc-extinguishing assembly 300 more quickly.

[0074] Of course, in other embodiments, the arc-extinguishing grid 310 may also be made of other metallic materials or non-metallic materials.

[0075] In one embodiment, the sealed housing 100 is further filled with an arc-extinguishing gas. This arc-extinguishing gas can be hydrogen, nitrogen, or other mixtures of gases that facilitate arc extinguishing. Hydrogen has a high thermal conductivity, effectively absorbing the heat from the arc generated between the moving contact 220 and the stationary contact 210 and transferring it to the surrounding medium, thus cooling the arc. Furthermore, the arc pressure drop in hydrogen is higher, making arc extinguishing easier. Nitrogen has a high ionization energy and is less prone to breakdown, resulting in a smaller arc generated when the moving contact 220 and the stationary contact 210 come into contact.

[0076] like Figure 1 and Figure 3 As shown, the relay includes four arc-extinguishing components 300, which are arranged in pairs. The two arc-extinguishing components 300 in a pair are arranged at intervals along the arrangement direction (first direction D1) of the two stationary contacts 210 of the contact component 200; the moving contact 220 is located between the two arc-extinguishing components 300 in a pair.

[0077] It should be noted that the number of arc extinguishing components 300 is not limited to four.

[0078] For example, when there is only one arc-extinguishing component 300, it can be a ring structure, and the arc-extinguishing grid 310 included in the arc-extinguishing component 300 is also a ring structure. The contact component 200 is located within the ring structure formed by the arc-extinguishing component 300. In this case, the number of contact components 200 can be one or more.

[0079] For example, when there are two arc-extinguishing components 300, the two arc-extinguishing components 300 are arranged at intervals along the first direction D1, and the contact component 200 is located between the two arc-extinguishing components 300. In this case, the number of contact components 200 can be one or more. When there are multiple contact components 200, the multiple contact components 200 are arranged at intervals along the third direction D3. In this case, in order for the arc-extinguishing component 300 to extinguish the arc generated by each contact component 200, the width of the arc-extinguishing component 300 along the third direction D3 can be increased, so that the arc-extinguishing component 300 is sufficient to cover multiple contact components 200.

[0080] like Figure 3 As shown, the stationary contact 210 of the contact assembly 200 is provided with a first arc guide plate 410 at one end near the moving contact plate 220. The first arc guide plate 410 extends from the stationary contact 210 toward the arc extinguishing assembly 300 and is used to guide the arc to move toward the arc extinguishing assembly 300.

[0081] In this embodiment, by providing a first arc guide plate 410, the electric arc generated between the moving contact 220 and the stationary contact 210 can be elongated along the extension direction of the first arc guide plate 410 and guided by the first arc guide plate 410 to move into the arc extinguishing assembly 300. The provision of the first arc guide plate 410 can shorten the arc extinguishing time and prevent the electric arc from burning the moving and stationary contacts for a long time. In addition, with the help of the first arc guide plate 410, the electric arc can be transferred from the contact surface between the moving contact 220 and the stationary contact 210 to the end of the first arc guide plate 410, thereby reducing the loss of the contact surface between the moving contact 220 and the stationary contact 210, reducing the occurrence of arc spikes, and ensuring the electrical clearance and withstand voltage breakdown capability between the moving contact 220 and the stationary contact 210.

[0082] Among them, the phenomenon of sharpening refers to the phenomenon that, under long-term operation or high load, the contact surface develops sharp protrusions or deformations due to current, electric arc or mechanical wear.

[0083] like Figure 3 As shown, both stationary contacts 210 of a contact assembly 200 are provided with first arc guide plates 410, and the two first arc guide plates 410 are symmetrically arranged along the first direction D1.

[0084] In one embodiment, the first arc guide plate 410 and the stationary contact 210 can be an integral structure or a separate structure.

[0085] When the first arc guide plate 410 and the stationary contact 210 are integrally formed, the process of forming the first arc guide plate 410 can be to process a C-angle, an R-angle, or a C-angle + R-angle at the end of the stationary contact 210 near the moving contact plate 220; or, the first arc guide plate 410 can be integrally formed at the end of the stationary contact 210 near the moving contact plate 220. The integral forming process can be machining, stamping, powder metallurgy, casting, etc.

[0086] When the first arc guide plate 410 and the stationary contact 210 are separate structures, the first arc guide plate 410 and the stationary contact 210 can be connected by welding, riveting or gluing.

[0087] like Figure 3 As shown, the moving contact 220 has second arc guide plates 420 at both ends along its length. The second arc guide plates 420 automatically extend the contact 220 toward the arc extinguishing assembly 300 to guide the arc toward the arc extinguishing assembly 300.

[0088] By providing the second arc guide plate 420, the electric arc generated between the moving contact 220 and the stationary contact 210 can be elongated along the extension direction of the second arc guide plate 420 and guided by the second arc guide plate 420 to move into the arc extinguishing assembly 300. The provision of the second arc guide plate 420 can shorten the arc extinguishing time and prevent the electric arc from burning the moving and stationary contacts for a long time. In addition, with the help of the second arc guide plate 420, the electric arc can be transferred from the contact surface between the moving contact 220 and the stationary contact 210 to the end of the second arc guide plate 420, thereby reducing the loss of the contact surface between the moving contact 220 and the stationary contact 210, reducing the occurrence of arc spikes, and ensuring the electrical clearance and withstand voltage breakdown capability between the moving contact 220 and the stationary contact 210.

[0089] As an example, the second arc plates 420 at both ends of the moving contact plate 220 along the length direction are symmetrically arranged along the first direction D1.

[0090] In one embodiment, the second arc guide plate 420 and the moving contact plate 220 can be an integral structure or a separate structure.

[0091] When the second guide arc plate 420 and the moving contact plate 220 are integrated into one structure, the integrated molding process can be machining, stamping, powder metallurgy, casting, etc.

[0092] When the second arc guide plate 420 and the moving contact plate 220 are separate structures, the second arc guide plate 420 and the moving contact plate 220 can be connected by welding, riveting or gluing.

[0093] like Figure 3 As shown, in the second direction D2, there is an included angle between the first guide plate 410 and the second guide plate 420, so that the first guide plate 410 and the second guide plate 420 form a flared structure.

[0094] In summary, the relays of the embodiments of this application have at least the following advantages and beneficial effects:

[0095] The relay of this application embodiment, by providing an arc-extinguishing component 300 around the contact component 200, can promptly extinguish the electric arc generated by the moving contact 220 and the stationary contact 210 during the closing and opening process. On the one hand, it avoids the electric arc generated by adjacent contact components 200 from merging to form a longer arc; on the other hand, the timely extinguishing of the arc can effectively prevent the arc from burning the moving contact 220 and the stationary contact 210, thereby extending the service life of the relay; furthermore, the arc-extinguishing component 300 is located inside the insulating cover 110 instead of outside the insulating cover 110, which can reduce the size of the relay and is beneficial for miniaturization.

[0096] Furthermore, the multiple arc-extinguishing grids 310 can "cut" the electric arc into multiple shorter arc segments, which is beneficial for arc extinguishing and significantly improves the overload breaking capacity of the relay, achieving the breaking effect of high voltage and high current. Moreover, since there is an airflow channel 720 communicating with the gap 710 between the arc-extinguishing assembly 300 and the inner wall of the sealing housing 100, this airflow channel 720 allows gas to pass through. When the electric arc enters the arc-extinguishing assembly 300, the gas in the gap 710 between adjacent arc-extinguishing grids 310 can be discharged into the airflow channel 720, allowing the electric arc to enter the arc-extinguishing assembly 300 more quickly, thereby lengthening the arc more rapidly. While "cutting" the arc, it can also cool the arc, achieving the purpose of extinguishing the arc.

[0097] It is understood that the various embodiments / implementations provided in this application can be combined with each other without creating contradictions, and will not be described one by one here.

[0098] In the embodiments of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0099] In the description of the embodiments of the application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the application.

[0100] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the claims. In this specification, the illustrative expressions 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 one or more embodiments or examples.

[0101] The above are merely preferred embodiments of the application examples and are not intended to limit the application examples. For those skilled in the art, the application examples can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the application examples should be included within the protection scope of the application examples.

Claims

1. A relay, characterized in that, include: Sealed housing; A contact assembly includes a movable contact piece and two stationary contacts. The stationary contacts are mounted on the sealed housing, and the movable contact piece is movably disposed within the sealed housing for contacting or separating from the two stationary contacts. An arc-extinguishing assembly is disposed within the sealed housing and located around the contact assembly, for extinguishing the arc generated during the contact and separation of the moving contact and the stationary contact; the arc-extinguishing assembly includes a plurality of arc-extinguishing grids arranged at intervals along the movement direction of the moving contact, with gaps between adjacent arc-extinguishing grids, and an airflow channel communicating with the gaps between the arc-extinguishing assembly and the inner wall surface of the sealed housing.

2. The relay according to claim 1, characterized in that, The relay includes two arc-extinguishing components, which are arranged at intervals along the arrangement direction of the two stationary contacts of the contact component; the moving contact is located between the two arc-extinguishing components.

3. The relay according to claim 1, characterized in that, The sealed housing includes an insulating cover made of ceramic material, the stationary contact is mounted on the insulating cover, the moving contact and the arc extinguishing assembly are disposed inside the insulating cover, and the airflow channel is provided between the arc extinguishing assembly and the inner wall surface of the insulating cover.

4. The relay according to claim 3, characterized in that, The insulating cover has the same number of through holes as the stationary contacts, and the through holes penetrate the inner and outer wall surfaces of the insulating cover. The stationary contact is inserted into the through hole and welded to the insulating cover.

5. The relay according to claim 3, characterized in that, The sealing housing further includes a frame, a yoke plate, and a metal cover. The insulating cover is connected to one side surface of the yoke plate in the thickness direction via the frame, and the metal cover is connected to the other side surface of the yoke plate in the thickness direction. The yoke plate has a perforation that penetrates the yoke plate along its thickness direction and communicates with the cavity enclosed by the insulating cover and the cavity enclosed by the metal cover, respectively.

6. The relay according to claim 5, characterized in that, The insulating cover and the frame, the frame and the yoke plate, and the metal cover and the yoke plate are all connected by welding.

7. The relay according to claim 1, characterized in that, The stationary contact of the contact assembly has a first arc guide plate at one end near the moving contact plate. The first arc guide plate extends from the stationary contact towards the arc extinguishing assembly to guide the electric arc toward the arc extinguishing assembly.

8. The relay according to claim 7, characterized in that, The first arc guide plate and the stationary contact are either an integral structure or separate structures.

9. The relay according to claim 1 or 7, characterized in that, The moving contact piece has second arc guide pieces at both ends along its length. The second arc guide pieces extend from the moving contact piece toward the arc extinguishing component to guide the electric arc toward the arc extinguishing component.

10. The relay according to claim 9, characterized in that, The second arc guide plate and the moving contact plate are either an integral structure or separate structures.

11. The relay according to claim 1, characterized in that, The number of contact components is multiple; The relay further includes a push rod component and a coil assembly. The push rod component is movably disposed within the sealed housing. The movable contact pieces of the plurality of contact components are mounted on the push rod component. The coil assembly is used to drive the push rod component to move.

12. The relay according to claim 1, characterized in that, The sealed housing is also filled with arc-quenching gas.

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