Arc extinguishing device and relay

Abstract

The utility model provides an arc extinguishing device and a relay, and relates to the technical field of electrical equipment. And direct current or alternating current is introduced into the relay. The arc extinguishing device comprises a base, a grid plate assembly and a magnetism generating piece. The grid plate assembly is installed on the base and comprises two arc extinguishing grid plates which are arranged at intervals. The magnetism generating piece is installed on the base and located between the two arc extinguishing grid pieces. The two arc extinguishing grid plates can be magnetized by the magnetism generating piece, so that the two arc extinguishing grid plates have different polarities, and a magnetic field with a fixed magnetic induction line direction is formed between the two arc extinguishing grid plates. The magnetic field can change the moving path of the electric arc, so that the electric arc is lengthened to consume energy and extinguish quickly in time, the possibility that the temperature rise of the moving contact and the static contact is high due to continuous combustion of the electric arc on the moving contact and the static contact can be reduced, and an existing relay can be used by being connected with alternating current and can also be used by being connected with the magnetic field. And direct current can be supplied for use, so that the universality of the relay is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and in particular to an arc extinguishing device and a relay. Background Art

[0002] A relay is an electronic control device that works based on the electromagnetic principle. It is used to automatically control the current and voltage in the circuit. It plays the role of automatic adjustment, safety protection, and circuit conversion in the circuit. It is widely used in photovoltaics, energy storage, and automotive applications.

[0003] At present, relays are often used with alternating current, or in other words, most of the current relays are AC relays. When the existing relays are used with direct current, they cannot promptly extinguish the arc generated when the moving contact and the stationary contact are separated, resulting in a high temperature rise on the moving contact and the stationary contact, which limits the use of the relays when direct current is applied, and reduces the universality of the relays. Utility Model Content

[0004] In view of the above problems, the present application provides an arc extinguishing device and a relay, which can promptly extinguish the arc generated when the moving contact and the static contact are separated, so that the relay is not only suitable for use with alternating current but also suitable for use with direct current, thereby improving the universality of the relay.

[0005] In the first aspect, the present application provides an arc extinguishing device, which is applied to a relay, wherein direct current or alternating current is supplied to the relay, and the relay comprises a moving contact and a stationary contact that cooperate with each other, and an arc is generated when the moving contact is separated from the stationary contact, and the arc extinguishing device comprises a base, a grid assembly, and a magnetic generating member. The grid assembly is mounted on the base, and the grid assembly comprises two arc extinguishing grids arranged at intervals. The magnetic generating member is mounted on the base, and the magnetic generating member is located between the two arc extinguishing grids. The magnetic generating member is used to magnetize the two arc extinguishing grids so that the two arc extinguishing grids generate a magnetic field, and the magnetic field is used to change the moving path of the arc so as to extinguish the arc.

[0006] In the embodiment of the present application, a magnetic generating member is provided between two arc extinguishing grids arranged at intervals, and the magnetic generating member can magnetize the two arc extinguishing grids so that the two arc extinguishing grids have different polarities, thereby forming a magnetic field with a fixed direction of magnetic flux lines between the two arc extinguishing grids. Since the electric arc includes charged particles, based on the left-hand rule, the electric arc will be affected by the magnetic field force in the magnetic field and the moving path will change. The electric arc with a changed moving path is elongated and consumes energy, which facilitates the timely and rapid extinguishing of the electric arc, so as to reduce the possibility of the problem of the electric arc continuing to burn on the moving contact and the static contact and causing a high temperature rise on the moving contact and the static contact. Therefore, the arc extinguishing device provided by the present application, regardless of whether the relay to which the arc extinguishing device belongs is connected to direct current or alternating current, under the magnetization of the magnetic generating member, the arc extinguishing grid can generate a magnetic field to change the moving path of the electric arc, so as to accelerate the extinguishing of the electric arc. The existing relay can be used not only by connecting to alternating current, but also by connecting to direct current, thereby improving the universality of the relay.

[0007] In some embodiments, in the arrangement direction of the two arc-extinguishing grids, the projection of the magnetic generating component at least partially falls within the projection range of the two arc-extinguishing grids.

[0008] The above solution can ensure that the magnetic field of the magnetic generating component can fully cover the arc extinguishing grid, or in other words, ensure that the arc extinguishing grid can be within the magnetic field range of the magnetic generating component so that the arc extinguishing grid can be effectively magnetized by the magnetic generating component.

[0009] In some embodiments, the base is provided with a support base, the support base is located on the same side of the moving contact and the static contact on the base, the support base is provided with a first mounting groove, and the magnetic generating component is fixedly installed in the first mounting groove.

[0010] By arranging a support seat on the base and fixing the magnetizing member in the first mounting groove arranged on the support seat, the magnetizing member can be fixedly mounted on the base, which is convenient for fixing the relative position of the magnetizing member and the arc extinguishing grid, thereby facilitating the magnetizing member to magnetize the arc extinguishing grid. In addition, by arranging the support seat on the base, the first mounting groove can be arranged not only on the bottom wall but also on the support seat, which is convenient for arranging the first mounting groove at a position closer to the arc extinguishing grid to better magnetize the arc extinguishing grid.

[0011] In some embodiments, the magnetic generating member is interference fit with the first mounting groove. And / or, the first mounting groove is a blind groove, and the arc extinguishing device further includes a plug, which is plugged at the notch of the first mounting groove to restrict the magnetic generating member in the first mounting groove. And / or, the arc extinguishing device further includes a fixing glue, and the magnetic generating member is coated with the fixing glue to be bonded to the first mounting groove through the fixing glue.

[0012] Through the above solution, the magnetic generating member can be fixedly installed in the first installation groove, reducing the possibility of shaking or moving of the magnetic generating member in the first installation groove. In this way, the magnetic generating member and the arc extinguishing grid can be kept in a relatively fixed position, thereby ensuring the magnetization effect of the magnetic generating member on the arc extinguishing grid.

[0013] In some embodiments, the magnetic generating member is a permanent magnet or an energized coil.

[0014] Regardless of whether the magnetic generating part is a permanent magnet or an energized coil, the magnetic generating part can generate a magnetic field. When the arc extinguishing grid is within the magnetic field range of the magnetic generating part, the magnetic generating part can magnetize the arc extinguishing grid, so that a stable magnetic field with a fixed magnetic flux line direction is generated between the two arc extinguishing grids.

[0015] In some embodiments, when the magnetic generating component is a permanent magnet, the magnetic generating component includes a south magnetic pole and a north magnetic pole, and an indication structure is provided on the outer wall of the base near the first mounting groove, and the indication structure is used to indicate the installation direction of the magnetic generating component so that the arrangement direction of the south magnetic pole and the north magnetic pole is consistent with the arrangement direction of the two arc extinguishing grids.

[0016] Through the above scheme, when the permanent magnet is installed in the first installation slot, the indication structure can provide indication for the permanent magnet so that the permanent magnet is installed in the first installation slot in the correct installation direction, so as to make the arrangement direction of the magnetic south pole and the magnetic north pole consistent with the arrangement direction of the two arc extinguishing grids. When the arrangement direction of the magnetic south pole and the magnetic north pole is consistent with the arrangement direction of the two arc extinguishing grids, the magnetic south pole can face one of the arc extinguishing grids with as large an area as possible to fully magnetize the arc extinguishing grid. Similarly, the magnetic north pole can face the other arc extinguishing grid with as large an area as possible to fully magnetize the arc extinguishing grid. The possibility of the situation that the arrangement direction of the magnetic south pole and the magnetic north pole is perpendicular to the arrangement direction of the two arc extinguishing grids and the two arc extinguishing grids cannot be fully magnetized is reduced.

[0017] In other embodiments, the support seat is further provided with two second mounting grooves, the two second mounting grooves are arranged at intervals, the two second mounting grooves correspond to the two arc extinguishing grids one by one, and the two arc extinguishing grids are installed in the corresponding second mounting grooves. The first mounting groove is located between the two second mounting grooves.

[0018] Through the above scheme, the two arc-extinguishing grids can be conveniently fixedly installed at suitable positions for arc extinguishing. The first installation groove is located between two adjacent second installation grooves, which facilitates the fixed installation of the magnetic generating member between the two arc-extinguishing grids. In this way, the magnetic generating member can magnetize the two arc-extinguishing grids into arc-extinguishing grids with different polarities, so that a magnetic field with a fixed direction of magnetic flux lines can be formed between the two arc-extinguishing grids.

[0019] In some embodiments, the arc extinguishing grid includes a first segment and a second segment connected to each other, the first segments of the two arc extinguishing grids are installed in the corresponding second installation grooves, and the second segments of the two arc extinguishing grids are located outside the second installation grooves and facing the moving contact and the stationary contact. The distance between the two second segments is less than the distance between the two first segments.

[0020] Through the above scheme, a narrow gap can be formed between the two second segments, which makes it easy to attract the arc between the two arc extinguishing grids, so as to extinguish the arc through the narrow gap arc extinguishing technology, thereby increasing the arc extinguishing speed and reducing the temperature rise on the moving contact and the static contact.

[0021] In some embodiments, the base includes a contact cavity and a control cavity, the contact cavity is used to accommodate a moving contact and a stationary contact, the control cavity is used to accommodate a coil of a relay, and the contact cavity and the control cavity are interconnected.

[0022] The above solution is equivalent to increasing the cooling space of the contact cavity. In this way, when the heat generated by the moving contact and the static contact is large and the heat generated by the coil is small when they are separated, the heat in the contact cavity can be dispersed to the control cavity, so that the temperature in the contact cavity can be reduced quickly, which is convenient for reducing the possibility of burning of the moving contact and the static contact due to excessive temperature rise for a long time.

[0023] In a second aspect, the present application provides a relay, which comprises the arc extinguishing device in the first aspect.

[0024] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of a relay provided in an embodiment of the present application at a certain viewing angle.

[0026] Figure 2 for Figure 1 Schematic diagram of the structure after the base is hidden.

[0027] Figure 3 An exploded view of the relay provided in an embodiment of the present application from another perspective.

[0028] Figure 4 A schematic structural diagram of a base provided in an embodiment of the present application.

[0029] Figure 5 A schematic diagram of the matching structure of an arc extinguishing grid, a moving contact and a stationary contact provided in an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 100, moving contact;

[0032] 200, static contact;

[0033] 300, base; 310, bottom wall; 320, first side wall; 330, second side wall; 340, third side wall; 350, support seat; 351, first mounting groove; 352, second mounting groove; 360, indication structure; 370, contact cavity; 380, control cavity;

[0034] 400, grid assembly; 410, arc extinguishing grid; 411, first segment; 412, second segment;

[0035] 500. Produce magnetic parts. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions.

[0038] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0040] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the current limiting module of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0042] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0043] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure can refer to a physical connection. For example, the physical connection can be a fixed connection, such as a fixed connection through a barrier, such as a fixed connection through a screw, bolt or other barrier; the physical connection can also be a detachable connection, such as a mutual snap connection or snap connection; the physical connection can also be an integral connection, such as welding, bonding or integral molding to form a connection for connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood in specific circumstances. The "connection" or "connection" of a circuit structure can refer to not only a physical connection, but also an electrical connection or a signal connection. For example, it can be a direct connection, that is, a physical connection, or it can be indirectly connected through at least one intermediate element, as long as the circuit is connected, and it can also be the internal connection of two elements; the signal connection can refer to a signal connection through a media medium, such as a radio wave, in addition to a signal connection through a circuit. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood in specific circumstances.

[0044] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application is clearly and completely described below in conjunction with the accompanying drawings.

[0045] Figure 1The schematic diagram of the structure of the relay provided in the embodiment of the present application at a certain viewing angle is shown. The relay can be supplied with direct current or alternating current, such as Figure 1 As shown, the relay includes a movable contact 100 and a stationary contact 200 that cooperate with each other. When the movable contact 100 and the stationary contact 200 are separated, an arc is generated. The relay includes an arc extinguishing device. Figure 2 for Figure 1 The schematic diagram of the structure after the base is hidden. Figure 3 An exploded view of a relay provided in an embodiment of the present application from another perspective, such as Figures 1 to 3 As shown, the arc extinguishing device includes: a base 300, a grid assembly 400 and a magnetic generating member 500. The grid assembly 400 is mounted on the base 300, and the grid assembly 400 includes two arc extinguishing grids 410 arranged at intervals. The magnetic generating member 500 is mounted on the base 300, and the magnetic generating member 500 is located between the two arc extinguishing grids 410. The magnetic generating member 500 is used to magnetize the two arc extinguishing grids 410 so that the two arc extinguishing grids 410 generate a magnetic field, and the magnetic field is used to change the moving path of the arc so as to extinguish the arc.

[0046] A relay used for passing direct current is called a DC relay, and a relay used for passing alternating current is called an AC relay. In order to simplify the description, this application will uniformly refer to DC relays and AC relays as relays. Therefore, the relays in this application can be either DC relays or AC relays.

[0047] Figure 1 and Figure 2 There are two pairs of moving contacts 100 and stationary contacts 200 shown in the figure, and an arc will be generated when each moving contact 100 is separated from the corresponding stationary contact 200. To this end, a grid assembly 400 and a magnetic generating member 500 can be provided corresponding to each pair of moving contacts 100 and stationary contacts 200.

[0048] like Figure 1 and Figure 2 As shown, the base 300 includes a bottom wall 310, and a first side wall 320, a second side wall 330 and a third side wall 340 connected to the same side of the bottom wall 310. The two moving contacts 100 face the first side wall 320, and the two stationary contacts 200 are installed on the first side wall 320 that the moving contacts 100 face.

[0049] The second side wall 330 is opposite to the third side wall 340, and the second side wall 330 is close to the first pair of moving contacts 100 and the stationary contact 200, and the third side wall 340 is close to the second pair of moving contacts 100 and the stationary contact 200. The grid assembly 400 corresponding to the first pair of moving contacts 100 and the stationary contact 200 can be installed on the bottom wall 310 or the second side wall 330, and the grid assembly 400 corresponding to the second pair of moving contacts 100 and the stationary contact 200 can be installed on the bottom wall 310 or the third side wall 340. Similarly, the magnetic generating member 500 corresponding to the first pair of moving contacts 100 and the stationary contact 200 can be installed on the bottom wall 310 or the second side wall 330, and the magnetic generating member 500 corresponding to the second pair of moving contacts 100 and the stationary contact 200 can be installed on the bottom wall 310 or the third side wall 340.

[0050] The grid assembly 400 and the magnetic generating member 500 corresponding to the first pair of moving contacts 100 and the stationary contacts 200 cooperate with each other, and can extinguish the arc generated when the first pair of moving contacts 100 and the stationary contacts 200 are separated. Similarly, the grid assembly 400 and the magnetic generating member 500 corresponding to the second pair of moving contacts 100 and the stationary contacts 200 cooperate with each other, and can extinguish the arc generated when the second pair of moving contacts 100 and the stationary contacts 200 are separated.

[0051] The embodiment of the present application does not limit the installation position of the grid assembly 400 and the magnetic generating component 500, as long as the magnetic generating component 500 can be located between the two arc extinguishing grids 410 that cooperate with it, and is located on the side of the two arc extinguishing grids 410 away from the corresponding moving contact 100 and the static contact 200, the two arc extinguishing grids 410 can be magnetized so that the two arc extinguishing grids 410 generate a magnetic field to facilitate arc extinguishing.

[0052] The arc extinguishing grid 410 can be made of magnetic conductive materials such as steel, iron alloy, etc., so as to generate a magnetic field under the magnetization of the magnetic generating member 500. The number of arc extinguishing grids 410 in the grid assembly 400 can be two. A magnetic generating member 500 is arranged between the two arc extinguishing grids 410. Under the magnetization of the magnetic generating member 500, the two arc extinguishing grids 410 are magnetized to have different polarities, so that a magnetic field with a fixed direction of magnetic flux lines can be formed between the two arc extinguishing grids 410.

[0053] The magnetism generating member 500 may be a magnetic material such as a permanent magnet or a powered coil, etc. When the magnetism generating member 500 is a permanent magnet, the magnetism generating member 500 may be in a long strip shape.

[0054] For an AC relay, under the action of electromagnetic repulsion, the arc generated between the moving contact 100 and the stationary contact 200 will blow toward the direction close to the grid assembly 400 and the magnetic generating member 500. When a magnetic field with a fixed direction of magnetic flux lines is formed between the two arc extinguishing grids 410, the arc-shaped magnetic flux lines on the front side of the two arc extinguishing grids 410 will cause the arc to change its moving path and be pulled between the two arc extinguishing grids 410 for extinguishing. The front side of the arc extinguishing grid 410 refers to the side of the arc extinguishing grid 410 close to the moving contact 100 and the stationary contact 200.

[0055] For a DC relay, when a magnetic field with a fixed direction of magnetic flux lines is formed between the two arc extinguishing grids 410, the arc extinguishing grids 410 will pull the arc, causing the arc to change its moving path under the action of the magnetic field and be elongated to consume energy, thereby facilitating the extinguishing of the arc.

[0056] In the embodiment of the present application, a magnetic generating member 500 is provided between two arc extinguishing grids 410 which are spaced apart. The magnetic generating member 500 can magnetize the two arc extinguishing grids 410 so that one of the arc extinguishing grids 410 acts as a magnetic south pole and the other arc extinguishing grid 410 acts as a magnetic north pole, thereby forming a magnetic field with a fixed direction of magnetic flux lines between the two arc extinguishing grids 410. Since the electric arc includes charged particles, based on the left-hand rule, the electric arc will be affected by the magnetic field force in the magnetic field and the moving path will change. The electric arc with a changed moving path is elongated and consumes energy, which facilitates the timely and rapid extinguishing of the electric arc, so as to reduce the possibility of the electric arc continuing to burn on the moving contact 100 and the stationary contact 200 and causing a high temperature rise on the moving contact 100 and the stationary contact 200. Therefore, the arc extinguishing device provided by the present application, regardless of whether the relay to which the arc extinguishing device belongs is supplied with direct current or alternating current, the arc extinguishing grid 410 can generate a magnetic field under the magnetization of the magnetic generating member 500 to change the moving path of the arc, so as to accelerate the extinguishing of the arc. This allows the existing relay to be used not only with alternating current but also with direct current, thereby improving the universality of the relay.

[0057] In addition, since the arc extinguishing requirements when the arc extinguishing device is used with AC power are lower than those when it is used with DC power, the magnetic generating component 500 does not need to be installed on the base 300 when the arc extinguishing device is used with AC power. However, when the arc extinguishing device is used with DC power, the magnetic generating component 500 can be installed on the base 300 to improve the arc extinguishing ability of the arc extinguishing device.

[0058] In some embodiments, in the arrangement direction of the two arc-extinguishing grids 410 , the projection of the magnetic generating member 500 at least partially falls within the projection range of the two arc-extinguishing grids 410 .

[0059] Such an arrangement can ensure that the magnetic field of the magnet generating component 500 can fully cover the arc extinguishing grid 410 , or in other words, ensure that the arc extinguishing grid 410 can be within the magnetic field range of the magnet generating component 500 , so that the arc extinguishing grid 410 can be effectively magnetized by the magnet generating component 500 .

[0060] In one possible case, in the arrangement direction of the two arc-extinguishing grids 410, the projection of the magnetic generating member 500 may completely fall within the projection range of the two arc-extinguishing grids 410. In another possible case, in the arrangement direction of the two arc-extinguishing grids 410, the projection of the magnetic generating member 500 may partially fall within the projection range of the two arc-extinguishing grids 410. The embodiment of the present application does not limit the projection relationship between the magnetic generating member 500 and the arc-extinguishing grid 410 in the arrangement direction of the two arc-extinguishing grids 410.

[0061] Figure 4 A schematic diagram of the structure of a base provided in an embodiment of the present application, in some embodiments, such as Figures 1 to 4 As shown, the base 300 is provided with a support base 350 , which is located on the same side of the moving contact 100 and the static contact 200 on the base 300 . The support base 350 is provided with a first mounting groove 351 , and the magnetic generating member 500 is fixedly mounted in the first mounting groove 351 .

[0062] The support base 350 may be connected only to the side wall, may be connected only to the bottom wall 310 , or may be connected to both the side wall and the bottom wall 310 .

[0063] Figure 3 The first mounting groove 351 shown in FIG. 3 extends from the support seat 350 to the outer wall of the bottom wall 310, so the notch of the first mounting groove 351 is set on the outer wall of the bottom wall 310. The outer wall of the bottom wall 310 refers to the side of the bottom wall 310 facing away from the moving contact 100 and the stationary contact 200. In this case, the magnetic generating member 500 can be inserted into the first mounting groove 351 from the side of the bottom wall 310 facing away from the moving contact 100 and the stationary contact 200.

[0064] The first mounting groove 351 can be arranged along the thickness direction of the bottom wall 310, or can have a small angle with the thickness direction of the bottom wall 310. The embodiment of the present application is not limited to this. As long as the magnetic generating component 500 is installed in the first mounting groove 351, the magnetic field of the magnetic generating component 500 can cover the arc extinguishing grid 410 as much as possible.

[0065] In this embodiment, a support seat 350 is provided on the base 300, and the magnetizing member 500 is fixedly installed in the first installation groove 351 provided on the support seat 350, so that the magnetizing member 500 can be fixedly installed on the base 300, and the relative position of the magnetizing member 500 and the arc extinguishing grid 410 is fixed, so that the magnetizing member 500 can magnetize the arc extinguishing grid 410. In addition, the support seat 350 is provided on the base 300, so that the first installation groove 351 can be provided not only on the bottom wall 310, but also on the support seat 350, so that the first installation groove 351 can be provided at a position closer to the arc extinguishing grid 410, so as to better magnetize the arc extinguishing grid 410.

[0066] Regarding the fixed installation of the magnetism-generating component 500 in the first installation groove 351 , in some possible embodiments, the magnetism-generating component 500 and the first installation groove 351 are interference-fitted.

[0067] The size of the magnetizing member 500 may be matched with the size of the first installation groove 351, so that when the magnetizing member 500 is installed in the first installation groove 351, the magnetizing member 500 may contact the groove wall of the first installation groove 351 to achieve an interference fit between the magnetizing member 500 and the first installation groove 351. Alternatively, the groove wall of the first installation groove 351 may be provided with a convex rib, and when the magnetizing member 500 is installed in the first installation groove 351, the magnetizing member 500 may contact the convex rib to achieve an interference fit between the magnetizing member 500 and the first installation groove 351.

[0068] In some other possible embodiments, the first installation groove 351 is a blind groove, and the arc extinguishing device further includes a plug, which is plugged at the notch of the first installation groove 351 to confine the magnetic generating component 500 within the first installation groove 351 .

[0069] In the case that the first installation groove 351 is a blind groove, the notch of the first installation groove 351 may face the external space of the arc extinguishing device, or the notch of the first installation groove 351 may face the internal space of the arc extinguishing device.

[0070] When the notch of the first mounting groove 351 faces the external space of the arc extinguishing device, the plug can be inserted from the outside of the arc extinguishing device into the notch of the first mounting groove 351. When the notch of the first mounting groove 351 faces the internal space of the arc extinguishing device, the plug can be inserted from the inside of the arc extinguishing device into the notch of the first mounting groove 351.

[0071] In some other possible embodiments, the arc extinguishing device further includes fixing glue, and the magnetic generating component 500 is coated with the fixing glue so as to be bonded to the first installation groove 351 by the fixing glue.

[0072] The fixing glue can be applied to a part of the side wall of the magnetic generating component 500, or to the entire side wall of the magnetic generating component 500. The embodiment of the present application does not limit this, as long as the magnetic generating component 500 can be bonded to the groove wall of the first installation groove 351 by the fixing glue.

[0073] The above only illustrates three ways of fixing and installing the magnetizing component 500 in the first installation slot 351. In practice, the magnetizing component 500 can be fixed in the first installation slot 351 in other ways. In addition, the magnetizing component 500 can be fixed in the first installation slot 351 in a single way, or in a combination of multiple ways, which is not limited in the present embodiment.

[0074] Please continue to refer to Figure 3 In some embodiments, when the magnetic generating component 500 is a permanent magnet, the magnetic generating component 500 includes a magnetic south pole and a magnetic north pole, and an indication structure 360 ​​may be provided on the outer wall of the base 300 near the first mounting groove 351. The indication structure 360 ​​is used to indicate the installation direction of the magnetic generating component 500 so that the arrangement direction of the magnetic south pole and the magnetic north pole is consistent with the arrangement direction of the two arc extinguishing grids 410.

[0075] The indication structure 360 ​​may be any one of a groove, a protrusion, a label or a letter.

[0076] Figure 3 The indicating structure 360 ​​shown in the figure is two letters N and S. Among them, N can indicate the direction of the magnetic north pole, and S can indicate the direction of the magnetic south pole. When installing the magnetic generating component 500, the magnetic south pole of the magnetic generating component 500 can be oriented toward the letter S, and the magnetic north pole can be oriented toward the letter N, so that the magnetic generating component 500 can be correctly installed in the first installation groove 351.

[0077] In this embodiment, an indication structure 360 ​​is provided at a position near the first installation groove 351 on the outer wall of the base 300. When the permanent magnet is installed in the first installation groove 351, the indication structure 360 ​​can provide an indication for the permanent magnet, so that the permanent magnet is installed in the first installation groove 351 in the correct installation direction, so as to make the arrangement direction of the magnetic south pole and the magnetic north pole consistent with the arrangement direction of the two arc-extinguishing grids 410. When the arrangement direction of the magnetic south pole and the magnetic north pole is consistent with the arrangement direction of the two arc-extinguishing grids 410, the magnetic south pole can face one of the arc-extinguishing grids 410 with as large an area as possible to fully magnetize the arc-extinguishing grid 410. Similarly, the magnetic north pole can face the other arc-extinguishing grid 410 with as large an area as possible to fully magnetize the arc-extinguishing grid 410. The possibility of the situation that the arrangement direction of the magnetic south pole and the magnetic north pole is perpendicular to the arrangement direction of the two arc-extinguishing grids 410 and the two arc-extinguishing grids 410 cannot be fully magnetized is reduced.

[0078] Figure 4 A schematic diagram of the structure of a base provided in an embodiment of the present application, in some embodiments, such as Figure 4 As shown, for a pair of moving contacts 100 and stationary contacts 200, the support seat 350 may also be provided with two second mounting grooves 352, the two second mounting grooves 352 are arranged at intervals, the two second mounting grooves 352 correspond to the two arc extinguishing grids 410, and the two arc extinguishing grids 410 are installed in the corresponding second mounting grooves 352. Figure 3 and Figure 4 , the first mounting groove 351 is located between the two second mounting grooves 352 .

[0079] The two second mounting grooves 352 may be parallel to the first mounting groove 351. The structures of the two second mounting grooves 352 may be the same, or may be slightly different, which is not limited in the embodiment of the present application, as long as the arc-extinguishing grid 410 can be fixed.

[0080] The distance between the second mounting groove 352 and the first mounting groove 351 can be set closer, so that when the magnetic generating component 500 is installed in the first mounting groove 351 and the arc extinguishing grid 410 is installed in the second mounting groove 352, the distance between the magnetic generating component 500 and the arc extinguishing grid 410 is closer, which can meet the requirement of the magnetic generating component 500 to magnetize the arc extinguishing grid 410 at a close distance.

[0081] In this embodiment, two second mounting grooves 352 are spaced apart on the support seat 350, so that the two arc-extinguishing grids 410 can be fixedly mounted at a suitable position for arc extinguishing. The first mounting groove 351 is located between two adjacent second mounting grooves 352, so that the magnetic generating member 500 can be fixedly mounted between the two arc-extinguishing grids 410, so that the magnetic generating member 500 can magnetize the two arc-extinguishing grids 410 into arc-extinguishing grids 410 with different polarities, so that a magnetic field with a fixed direction of magnetic flux lines can be formed between the two arc-extinguishing grids 410.

[0082] Figure 5 A schematic diagram of the matching structure of an arc extinguishing grid, a moving contact and a stationary contact provided in an embodiment of the present application. In some embodiments, in combination with Figures 1 to 5 The arc extinguishing grid 410 includes a first segment 411 and a second segment 412 connected to each other. The first segments 411 of the two arc extinguishing grids 410 are installed in the corresponding second installation grooves 352, and the second segments 412 of the two arc extinguishing grids 410 are located outside the second installation grooves 352 and face the moving contact 100 and the stationary contact 200. The distance between the two second segments 412 is smaller than the distance between the two first segments 411.

[0083] The first segment 411 is a portion of the arc extinguishing grid 410 away from the moving contact 100 and the stationary contact 200 , and the second segment 412 is a portion of the arc extinguishing grid 410 close to the moving contact 100 and the stationary contact 200 .

[0084] The distance between the two second segments 412 is smaller than the distance between the two first segments 411, so that a narrow gap can be formed between the two second segments 412, which facilitates attracting the arc between the two arc extinguishing grids 410, so as to extinguish the arc through the narrow gap arc extinguishing technology, thereby facilitating increasing the arc extinguishing speed and reducing the temperature rise on the moving contact 100 and the static contact 200.

[0085] Please continue to refer to Figure 1 and Figure 4 In some embodiments, the base 300 includes a contact cavity 370 and a control cavity 380. The contact cavity 370 is used to accommodate the moving contact 100 and the static contact 200. The control cavity 380 is used to accommodate the coil of the relay. The contact cavity 370 and the control cavity 380 are interconnected.

[0086] During the operation of the arc extinguishing device, the moving contact 100 and the stationary contact 200 will generate heat, and the coil will also generate heat. However, when the moving contact 100 and the stationary contact 200 are separated to generate an arc, the temperature rise of the contact cavity 370 where the moving contact 100 and the stationary contact 200 are located is higher than the temperature rise of the control cavity 380 where the coil is located. The present application connects the contact cavity 370 and the control cavity 380 to each other, which is equivalent to increasing the cooling space of the contact cavity 370. In this way, when the heat generated when the moving contact 100 and the stationary contact 200 are separated is large, and the heat generated by the coil is small, the heat in the contact cavity 370 can be dispersed into the control cavity 380, so that the temperature in the contact cavity 370 can be reduced quickly, which is convenient for reducing the possibility of burning of the moving contact 100 and the stationary contact 200 due to excessive temperature rise for a long time.

[0087] The present application also provides a relay, which includes the arc extinguishing device in the above embodiment. The structure and effect of the arc extinguishing device have been described in detail in the above embodiment, so the present application will not repeat them here.

Claims

1. An arc extinguishing device, characterized in that: Applied to a relay, the relay is supplied with direct current or alternating current, the relay comprises a movable contact and a stationary contact that cooperate with each other, an arc is generated when the movable contact is separated from the stationary contact, and the arc extinguishing device comprises: Base; A grid assembly is mounted on the base, wherein the grid assembly includes two arc-extinguishing grids arranged at intervals; A magnetic generating component is installed on the base, and the magnetic generating component is located between the two arc extinguishing grids; The magnetic generating member is used to magnetize the two arc extinguishing grids so that the two arc extinguishing grids generate a magnetic field, and the magnetic field is used to change the moving path of the electric arc so as to extinguish the electric arc.

2. The arc extinguishing device according to claim 1, characterized in that: In the arrangement direction of the two arc-extinguishing grids, the projection of the magnetic generating member at least partially falls within the projection range of the two arc-extinguishing grids.

3. The arc extinguishing device according to claim 1, characterized in that: The base is provided with a support base, the support base is located on the same side of the moving contact and the static contact on the base, the support base is provided with a first mounting groove, and the magnetic generating component is fixedly installed in the first mounting groove.

4. The arc extinguishing device according to claim 3, characterized in that: The magnet-producing member is interference-fitted with the first mounting groove; and / or, The first installation groove is a blind groove, and the arc extinguishing device further includes a plug, which is plugged at the notch of the first installation groove to restrict the magnetic generating component in the first installation groove; and / or, The arc extinguishing device further includes a fixing glue, and the magnetic generating component is coated with the fixing glue so as to be bonded to the first mounting groove through the fixing glue.

5. The arc extinguishing device according to claim 3, characterized in that: The magnetic generating part is a permanent magnet or an energized coil.

6. The arc extinguishing device according to claim 5, characterized in that: When the magnetic generating component is the permanent magnet, the magnetic generating component includes a south magnetic pole and a north magnetic pole, and an indication structure is provided on the outer wall of the base near the first mounting groove, and the indication structure is used to indicate the installation direction of the magnetic generating component so that the arrangement direction of the south magnetic pole and the north magnetic pole is consistent with the arrangement direction of the two arc extinguishing grids.

7. The arc extinguishing device according to claim 5, characterized in that: The support seat is further provided with two second mounting grooves, the two second mounting grooves are arranged at intervals, the two second mounting grooves correspond to the two arc-extinguishing grids one by one, and the two arc-extinguishing grids are installed in the corresponding second mounting grooves; The first mounting groove is located between two of the second mounting grooves.

8. The arc extinguishing device according to claim 7, characterized in that: The arc-extinguishing grid comprises a first segment and a second segment connected to each other, the first segments of the two arc-extinguishing grids are installed in the corresponding second installation grooves, and the second segments of the two arc-extinguishing grids are located outside the second installation grooves and facing the moving contact and the stationary contact; The distance between two of the second segments is smaller than the distance between two of the first segments.

9. The arc extinguishing device according to claim 1, characterized in that: The base comprises a contact cavity and a control cavity, wherein the contact cavity is used to accommodate the moving contact and the stationary contact, and the control cavity is used to accommodate the coil of the relay, and the contact cavity and the control cavity are communicated with each other.

10. A relay, characterized in that: It comprises the arc extinguishing device as described in any one of claims 1-9.

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