Switching device

Abstract

The present application provides a switching device, comprising a contact system. The contact system comprises two contact groups. The two contact groups are respectively an arc-resistant end contact group and a current-carrying end contact group, and each of the two contact groups comprises at least one pair of dynamic and static contacts. When the contact system is disconnected, a gap between the dynamic and static contacts of the arc-resistant end contact group is smaller than a gap between the dynamic and static contacts of the current-carrying end contact group. A permanent magnet is arranged on the periphery of the arc-resistant end contact group, so that, for the contact system designed as an anti-short circuit structure having a double-contact parallel circuit, on the basis of having a capability of carrying a large current, the technical effect of magnetic blow-out can already be achieved without providing permanent magnets on the periphery of each contact group among the two contact groups, thereby simplifying the structure of a relay, saving raw materials, and enabling the layout of the relay to be more compact.

Description

A switching device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 1, 2023, with application number 202322961719.9 and application name “A Switching Electrical Appliance”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of switch electrical appliances, and in particular to a switch electrical appliance. Background Art

[0003] Relays, as electronic control devices, control large currents using small ones. They are widely used in automatic control circuits, providing functions such as automatic regulation, safety protection, and circuit switching. A type of relay, the magnetic latching relay, features contacts that are held open and closed by permanent magnets. When used in AC (sinusoidal) circuits, relays can utilize zero-crossing switching technology, making arc extinguishing requirements for electromagnetic relays relatively low. However, when used in DC circuits, if the relay is subjected to a short-circuit current or a lightning strike, and the contacts open, the arc in existing relays can easily strike the base or plastic housing, melting the base or actuator. This leads to low arc resistance, causing serious damage to the relay structure and resulting in unnecessary losses. Therefore, improving the arc extinguishing capability of electromagnetic relays when subjected to heavy DC loads, making them more suitable for high DC current and high DC voltage applications, has long been a technological pursuit in the industry.

[0004] Some DC load relays have polarity specified in their wiring method, i.e. the contacts are polarized. If the polarity is connected incorrectly, the performance of the relay will be greatly reduced, the electrical life of the relay will be greatly reduced, and the relay may even fail to work properly.

[0005] Application Contents

[0006] To this end, in order to address the above-mentioned problems, the present application provides a switching device.

[0007] This application is implemented using the following solution:

[0008] The present application proposes a switching electrical appliance, including a contact system, wherein the contact system includes two groups of contact groups, the two groups of contact groups are arc-proof end contact groups and current-carrying end contact groups, and each of the two groups of contact groups includes at least one pair of moving and static contacts; when the contact system is disconnected, the gap between the moving and static contacts of the arc-proof end contact group is smaller than the gap between the moving and static contacts of the current-carrying end contact group; wherein a permanent magnet is arranged on the periphery of the arc-proof end contact group.

[0009] In one embodiment, the arc-proof end contact group includes a first moving contact and a second static contact, and the current-carrying end contact group includes a first static contact and a second moving contact; the contact system also includes a first moving spring and a second moving spring, the first static contact and the first moving contact are respectively arranged at the two ends of the length direction of the first moving spring, the second static contact and the second moving contact are respectively arranged at the two ends of the length direction of the second moving spring, the first static contact and the second moving contact are respectively arranged opposite to each other, and the first moving contact and the second static contact are arranged opposite to each other.

[0010] In one embodiment, the switching device further includes a base, the contact system is installed on the base, the direction close to the base is defined as downward, and the direction away from the base is defined as upward, ceramic sheets are further provided above and below the arc-proof end contact group, and the permanent magnet is provided on the side of the arc-proof end contact group so that it is located on the periphery of the arc-proof end contact group.

[0011] Among them, in one embodiment, the switching electrical appliance also includes a base, the contact system is installed on the base, and the direction close to the base is defined as downward, and the direction away from the base is defined as upward. Ceramic sheets are also provided above and below the arc-proof end contact group, and the permanent magnet is provided on the side of the arc-proof end contact group so that it is located on the periphery of the arc-proof end contact group; the ceramic sheet includes a first part and a second part that are connected to each other, the first part and the second part are perpendicular to each other, the first part is in the shape of a sheet, and the second part is in the shape of a plate that is thin in the middle and thick on both sides, and a notch is provided in the thin middle part, the notch is arc-shaped, and the diameter of the notch is larger than the contact diameter of the arc-proof end contact group, so that after the ceramic sheet is installed, the second part is at least partially located between the first moving spring sheet and the second moving spring sheet, and the notch is directly opposite to the contact and at least partially arranged around the contact.

[0012] In one embodiment, the switching device further includes a base, the contact system is installed on the base, the direction close to the base is defined as downward, and the direction away from the base is defined as upward, arc extinguishing grids are further provided above and below the arc-proof end contact group, and the permanent magnet is provided on the side of the arc-proof end contact group so that it is located on the periphery of the arc-proof end contact group.

[0013] In one embodiment, the arc extinguishing grid includes a grid base, arc extinguishing grid pieces and arc striking grid pieces. A plurality of slots parallel to each other are provided on the grid base, and the arc extinguishing grid pieces and the arc striking grid pieces are inserted into the slots, so that each of the arc extinguishing grid pieces and the arc striking grid pieces are arranged parallel to each other.

[0014] In one embodiment, the number of the arc-extinguishing grids is more than two, the arc-extinguishing grids are of equal length and have flush ends, an arc-extinguishing notch is provided at the end of each of the arc-extinguishing grids, and the end of the arc-striking grid is provided with an arc-striking fold that extends beyond the end of the arc-extinguishing grid and is tilted and bent toward the contact group.

[0015] In one embodiment, the switch electrical appliance further comprises a housing, and the arc extinguishing grids provided above and below the arc-proof end contact group are respectively mounted on the housing and the base.

[0016] In one embodiment, the switching device further includes a base, the contact system is installed on the base, the direction close to the base is defined as downward, and the direction away from the base is defined as upward, the permanent magnet is arranged above the arc-proof end contact group so that it is located on the periphery of the arc-proof end contact group, and ceramic sheets are provided at least in the left and right directions of the arc-proof end contact group.

[0017] In one embodiment, the permanent magnet is only provided on the periphery of the arc-proof end contact group, but not on the periphery of the current-carrying end contact group.

[0018] In one embodiment, the switching device is a magnetic latching relay.

[0019] The technical solution provided by this application has the following technical effects:

[0020] 1. The present application provides a permanent magnet on one side of the arc-proof end contact group, i.e., the contact group consisting of the first moving contact and the second static contact. The permanent magnet is provided on one side of the contact group, and utilizes the force exerted on the current in the magnetic field to stretch the arc when the relay switches the DC to disconnection, so that it extinguishes the arc, thereby achieving the effect of magnetic arc blowing. In addition, the permanent magnet is provided on one side of the arc-proof end contact group, so that the contact system designed as a short-circuit-resistant structure of a dual-contact parallel circuit can achieve the technical effect of magnetic arc blowing without having to provide a permanent magnet on one side of each contact group of the dual contact group, while having the ability to carry large currents. This simplifies the structure of the relay, saves raw materials, and makes the layout of the relay more compact. The distance between the arc-proof end contact group and the current-carrying end contact group can be increased to prevent the arc generated by the arc-proof end contact group from contaminating the current-carrying end contact group, thereby increasing the service life of the product. In addition, the permanent magnet is provided on one side of the contact group to achieve non-polar load wiring.

[0021] 2. The present application also provides ceramic sheets above and below the arc-resistant end contact group. The ceramic sheets can prevent the arc from burning, for example, the plastic shell, and on the other hand, they also have a cooling effect on the arc, which is more conducive to arc disconnection.

[0022] 3. The present application may optionally provide arc extinguishing grids above and below the arc-resistant end contact group. The arc extinguishing grids can greatly enhance the arc extinguishing effect based on the magnetic blowout arc extinguishing effect achieved by the permanent magnet. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a perspective view of a magnetic latching relay;

[0024] FIG2 is a perspective view of the magnetic latching relay in the direction of the base;

[0025] FIG3 is a front view of the magnetic latching relay with the housing removed;

[0026] FIG4 is a front view of the magnetic latching relay with the housing and base removed;

[0027] FIG5 is a front view of the magnetic circuit system and the contact system in the disconnected state;

[0028] FIG6 is a cross-sectional view of the contact system;

[0029] FIG7 is a perspective view of the base and the ceramic piece installed;

[0030] Figure 8 is a perspective view of the base;

[0031] FIG9 is a perspective view of a ceramic sheet;

[0032] FIG10 is a perspective view of a permanent magnet bracket;

[0033] Figure 11 is a perspective view of the housing;

[0034] FIG12 is a front view of a magnetic latching relay with a permanent magnet located above and the housing removed;

[0035] FIG13 is a cross-sectional view of the contact system with the permanent magnet located at the top;

[0036] FIG14 is a perspective view of a housing according to another embodiment;

[0037] FIG15 is a perspective view of another embodiment of the base and the ceramic plate installation;

[0038] FIG16 is a perspective view of a ceramic sheet according to another embodiment;

[0039] Figure 17 is a perspective view of arc chute arranged above and below the contacts;

[0040] FIG18 is a perspective view of the contact system and magnetic circuit system with arc extinguishing grids provided above and below the contacts;

[0041] FIG19 is a perspective view of the arc chute;

[0042] Figure 20 is a perspective view of a grid seat;

[0043] FIG21 is a perspective view of the arc chute and the housing installation;

[0044] FIG22 is a perspective view of a housing according to another embodiment;

[0045] Figure 23 is a perspective view of the arc chute and the base installation;

[0046] FIG24 is a three-dimensional view of a base according to another embodiment. Specific embodiments

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] It should be understood that references throughout this specification to "one embodiment" or "an embodiment" mean that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Therefore, the appearances of "in one embodiment" or "in an embodiment" throughout this specification do not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0049] To further illustrate various embodiments, this application includes accompanying drawings. These drawings form part of the disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this application. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0050] The present application will now be further described with reference to the accompanying drawings and specific implementation methods.

[0051] As shown in Figures 1-6, the present application provides a switch device comprising a base 20, a housing 10, a first lead pin 30, a second lead pin 40, a coil lead pin 50, a magnetic circuit system 60, and a contact system 70. The contact system 70 connects the first lead pin 30 and the second lead pin 40. The magnetic circuit system 60 is used to actuate the contact system 70, causing the moving and static contacts in the contact system 70 to engage or disengage, thereby establishing or disconnecting conduction between the first lead pin 30 and the second lead pin 40. The magnetic circuit system 60 is connected to the coil lead pin 50, which is used to connect to a control circuit to control the actuation of the contact system 70 by the magnetic circuit system 60. The magnetic circuit system 60 and the contact system 70 are mounted on the base 20. The housing 10 and the base 20 are mounted and matched to form an internal space within the housing 10 and the base 20, and the housing 10 and the base 20 enclose the magnetic circuit system 60 and the contact system 70 within the internal space. The first lead pin 30, the second lead pin 40 and the coil lead pin 50 extend downwardly out of the inner space through the bottom surface of the base 20. As shown in FIG1 , in the present application, the shape of the first lead pin 30 and the shape of the second lead pin 40 can both be sheet-shaped.

[0052] As shown in Figure 3, the contact system 70 adopts a double-contact anti-short-circuit structure. Specifically, the contact system 70 includes a first lead-out piece 71, a first movable spring piece 73, a second lead-out piece 72, a second movable spring piece 74, an arc-proof end contact group 701 and a current-carrying end contact group 702. Each of the arc-proof end contact group 701 and the current-carrying end contact group 702 includes at least one pair of moving and static contacts. In this embodiment, the arc-proof end contact group 701 includes a first moving contact 78 and a second static contact 77, and the current-carrying end contact group 702 includes a first static contact 75 and a second moving contact 76. As shown in Figure 5, when the contact system 70 is in the disconnected state, the gap S1 between the first moving contact 78 and the second static contact 77 is smaller than the gap S2 between the first static contact 75 and the second moving contact 76. That is, S1 <S2。

[0053] In the contact system 70 of this embodiment, the first movable spring 73 is connected to the first lead-out piece 71, and the second movable spring 74 is connected to the second lead-out piece 72. A first stationary contact 75 and a first movable contact 78 are respectively disposed at the longitudinal ends of the first movable spring 73, and a second stationary contact 77 and a second movable contact 76 are respectively disposed at the longitudinal ends of the second movable spring 74. The first stationary contact 75 and the second movable contact 76 are disposed opposite each other, and the first movable contact 78 and the second stationary contact 77 are disposed opposite each other.

[0054] It is understood that in the contact system 70 of the embodiment of the present invention, since the contact gaps between the two groups of movable and static contacts are different in the open state, when the contact system 70 switches from the closed state to the open state, the first static contact 75 and the second movable contact 76 with the larger contact gap will disconnect before the first movable contact 78 and the second static contact 77 with the smaller contact gap. Moreover, when the first static contact 75 and the second movable contact 76 with the larger contact gap just disconnect, the first movable contact 78 and the second static contact 77 with the smaller contact gap have not yet completely disconnected. Therefore, the first static contact 75 and the second movable contact 76 with the larger contact gap do not generate an arc when disconnected. Therefore, the first static contact 75 and the second movable contact 76 with the larger contact gap act as current carriers, while the first movable contact 78 and the second static contact 77 with the smaller contact gap act as arc-proof contacts.

[0055] It should be noted that the design of different contact gaps between the two groups of movable and static contacts can be achieved by reducing the contact height. Specifically, as shown in FIG5 , the contact thickness of the first static contact 75 and the second movable contact 76 is less than the contact thickness of the first movable contact 78 and the second static contact 77 . Therefore, when the contact system 70 is in the disconnected state, since the contact thickness of the first static contact 75 and the second movable contact 76 is smaller than the contact thickness of the first movable contact 78 and the second static contact 77 , the contact gap between the first static contact 75 and the second movable contact 76 is larger and greater than the contact gap between the first movable contact 78 and the second static contact 77 .

[0056] In addition, the contact gaps between the two groups of moving and static contacts can be designed to be different by tilting at least one of the first moving reed piece 73 or the second moving reed piece 74 .

[0057] Of course, the contact gaps can be designed to be different in other ways, which will not be listed here one by one. As long as it can be achieved that the contact gaps between the two groups of moving and static contacts are different when the contact system 70 is in the disconnected state, it will be sufficient.

[0058] In contact system 70, a first movable spring 73 and a second movable spring 74 are arranged in parallel. The movable and static contacts on the first and second movable springs 73 and 74 correspond to each other, forming two sets of movable and static contact groups. Consequently, these two sets of movable and static contact groups—the first movable contact 78 and the second static contact 77, and the first static contact 75 and the second movable contact 76—form a parallel circuit structure upon contact. Contact system 70 is designed as a short-circuit-resistant dual-contact parallel circuit, effectively reducing temperature rise and improving its ability to carry high currents such as short-circuit currents and lightning currents.

[0059] As shown in Figure 6, in the current-carrying end contact group 702, that is, the first static contact 75 and the second moving contact 76 contact group, the first static contact 75 can be composed of multiple static part contacts, and the second moving contact 76 can be composed of multiple moving part contacts, such as moving part contacts 761 and 762, and the static part contacts and the moving part contacts form multiple contact groups corresponding to each other. In this way, the parallel structure formed by multiple contact groups can further reduce the temperature rise of the relay and further improve the current-carrying capacity of the relay.

[0060] As shown in Figures 4-5, a permanent magnet 90 is disposed on the periphery of the arc-proof end contact group 701, which is composed of the first movable contact 78 and the second static contact 77. In this embodiment, the permanent magnet 90 is disposed on the periphery of the arc-proof end contact group. By utilizing the force exerted by current in a magnetic field, the electric arc is elongated and extinguished when the relay switches the DC to the disconnect state, thereby achieving the effect of magnetic arc extinguishing. Furthermore, in this embodiment, the permanent magnet 90 is disposed on the periphery of the arc-proof end contact group 701, rather than on the periphery of the current-carrying end contact group 702. This allows the contact system 70 designed as a short-circuit-resistant structure of a dual-contact parallel circuit to achieve the technical effect of magnetic arc extinguishing without having to dispose a permanent magnet on the periphery of each contact group of the dual contact group, while having the ability to carry large currents. This simplifies the structure of the relay, saves raw materials, and makes the layout of the relay more compact. Furthermore, the distance between the arc-proof end contact group 701 and the current-carrying end contact group 702 can be enlarged, thereby preventing the arc generated by the arc-proof end contact group 701 from contaminating the current-carrying end contact group 702 and improving the service life of the product.

[0061] In addition, in this embodiment, a permanent magnet 90 is provided on one side of the contact group to realize non-polar load wiring. Some DC load relays have a wiring method that specifies polarity. If the polarity is connected incorrectly, the performance of the relay will be greatly reduced, or even fail to work properly.

[0062] As shown in FIG2-8 , a first mounting slot 220 and a second mounting slot 230 are provided on the base 20. The first mounting slot 220 is used to install the contact system 70, and the second mounting slot 230 is used to install the magnetic circuit system 60. The first mounting slot 220 and the second mounting slot 230 are arranged side by side on the base 20. As shown in FIG3-5 and FIG10 , the permanent magnet 90 can be installed on the permanent magnet bracket 910. The permanent magnet bracket 910 can be installed on the base 20, so as to firmly install the permanent magnet 90 on the base 20. The permanent magnet bracket 910 can be an L-shaped metal bracket. The permanent magnet bracket 910 is made of a magnetic conductive material, such as iron. The use of a magnetic conductive material in the permanent magnet bracket 910 can reduce magnetic leakage, thereby improving the magnetic efficiency of the permanent magnet 90, which is more conducive to improving the magnetic blowout effect.

[0063] The above description describes the technical effect of magnetic arc extinguishing by placing permanent magnets 90 around the arc-proof end contact group 701, i.e., the contact group consisting of the first movable contact 78 and the second stationary contact 77. Furthermore, to further enhance the arc extinguishing effect, as shown in FIG6 , ceramic plates 80 are placed above and below the arc-proof end contact group 701, i.e., the contact group consisting of the first movable contact 78 and the second stationary contact 77. These ceramic plates 80 not only prevent the arc from burning the plastic housing 10 but also cool the arc, facilitating arc interruption.

[0064] In this structure, the permanent magnet 90 is disposed on the side of the arc-proof end contact group 701 so as to be located outside the arc-proof end contact group 701, as shown in Figure 6. In other embodiments, the permanent magnet 90 can also be replaced by two permanent magnet groups with opposite polarities relative to the inner end.

[0065] As shown in Figures 6-9, the ceramic sheet 80 includes a first portion 810 and a second portion 820 that are connected to each other. The first portion 810 and the second portion 820 are substantially perpendicular to each other. The first portion 810 is in the form of a sheet and can be mounted as a base on the base 20 or the housing 10. Specifically, referring to Figures 7-11, the base 20 is provided with a lower mounting groove 24, and the first portion 810 can be mounted in the lower mounting groove 24, thereby mounting the ceramic sheet 80 on the base 20. The housing 10 is provided with an upper mounting groove 11, and the first portion 810 can be mounted in the upper mounting groove 11, thereby mounting the ceramic sheet 80 on the housing 10. The second portion 820 is in the shape of a plate, thin in the middle and thick at both ends. A notch 821 is provided in the thin portion. Notch 821 is roughly arc-shaped, and its diameter is larger than the diameter of the contacts of the arc-resistant end contact group 701. This allows the second portion 820 to be at least partially located between the first and second movable springs 73 and 74 after the ceramic sheet 80 is installed, with the notch 821 facing the contacts and at least partially surrounding them. This arrangement allows the upper and lower ceramic sheets 80 to at least partially surround the contacts of the arc-resistant end contact group 701. The insulating properties of the ceramic sheets 80 facilitate the interruption of the arc between the contacts of the arc-resistant end contact group 701, improving the arc cooling effect.

[0066] In other embodiments, the ceramic sheet 80 can also be replaced with other insulating and heat-insulating materials, such as silica, mica, etc., to form an insulating and heat-insulating structure on both sides of the contact. The ceramic sheet 80 has low cost and is simple to manufacture, so this embodiment uses the ceramic sheet 80 as the specific implementation structure.

[0067] Alternatively, as shown in Figures 12-16, the direction closer to the base 20 is defined as downward, and the direction away from the base 20 is defined as upward. The permanent magnet 90' can also be arranged above the arc-proof end contact group 701, i.e., the contact group consisting of the first movable contact 78 and the second static contact 77, so that it is located on the periphery of the arc-proof end contact group 701. In this arrangement, the ceramic sheet 80' is only arranged below the contact group. The ceramic sheet 80' has a first portion 810 and an elongated second portion 820'. The second portion 820' is provided with a deeper notch 821', so that after the ceramic sheet 80' is installed, the contact can be generally accommodated in the notch 821'. In this way, the ceramic sheet 80' is arranged around the periphery of the arc-proof end contact group 701 in three directions: left, right, and bottom of the arc-proof end contact group 701, as shown in Figure 13. In other embodiments, the ceramic sheet is only arranged in the left and right directions of the arc-proof end contact group 701. When the permanent magnet 90' is arranged above the arc-proof end contact group 701, the direction in which the arc needs to be extinguished is the left and right direction of the arc-proof end contact group 701. The ceramic sheet is arranged at least in the left and right directions of the arc-proof end contact group 701, so that on the basis of the effect of magnetic arc extinguishing achieved by the permanent magnet 90', the ceramic sheet can also have a cooling effect on the arc, which is beneficial to the arc disconnection, and the amount of ceramic sheet used is less, which saves raw materials and simplifies the structure. The first part 810 of the ceramic sheet 80' is also connected to the positioning arm 830. The positioning arm 830 plays an auxiliary positioning role for the installation of the ceramic sheet 80' on the base 20'. In this structure, the shell 10' has a permanent magnet mounting groove 12, and the permanent magnet 90' can be installed in the permanent magnet mounting groove 12.

[0068] As previously described, a permanent magnet 90 is disposed on one side of the arc-proof end contact group 701, i.e., the contact group consisting of the first movable contact 78 and the second static contact 77. Furthermore, ceramic sheets 80 are disposed above and below the arc-proof end contact group 701, i.e., the contact group consisting of the first movable contact 78 and the second static contact 77, to enhance the arc extinguishing effect. Alternatively, as shown in Figures 17-24, the ceramic sheets 80 are not disposed above and below the arc-proof end contact group 701, i.e., the contact group consisting of the first movable contact 78 and the second static contact 77. Instead, the ceramic sheets 80 are replaced with arc-extinguishing grids 100. That is, arc-extinguishing grids 100 are disposed above and below the arc-proof end contact group 701, i.e., the contact group consisting of the first movable contact 78 and the second static contact 77. The provision of the arc-extinguishing grids 100 can significantly enhance the arc extinguishing effect, based on the magnetic blowout arc extinguishing effect achieved by the permanent magnets 90.

[0069] In this structure, the permanent magnet 90 is disposed on the side of the arc-proof end contact group 701 so as to be located outside the arc-proof end contact group 701, as shown in Figures 17 and 18. In other embodiments, the permanent magnet 90 can also be replaced by two permanent magnet groups with opposite polarities relative to the inner end.

[0070] As shown in Figures 17-24, the arc quenching grid 100 includes a grid base 110, arc quenching grids 120, and arc-starting grids 130. There are two or more arc quenching grids 120, and the arc quenching grids 120 are of equal length and have flush ends. The grid base 110 is provided with a plurality of parallel slots 111, into which the arc quenching grids 120 and arc-starting grids 130 are inserted, ensuring that each arc quenching grid 120 and arc-starting grid 130 is arranged parallel to each other. In this embodiment, there are two arc quenching grids 120. The two arc-quenching grids 120 are of equal length and have flush ends. Each arc-quenching grid 120 is provided with an arc-quenching notch 121 at its end. This V-shaped notch 121 creates a bifurcated structure at the end of the arc-quenching grid 120, facilitating rapid segmentation of the arc by the pair of arc-quenching grids 120. The arc-striking grid 130 is a metal grid made of arc-striking magnetic material. The end of the arc-striking grid 130 is provided with an arc-striking fold 131 that extends beyond the ends of the pair of arc-quenching grids 120 and is angled toward the contact assembly. This allows the arc to be guided into the arc-quenching grid 100 using the arc-striking fold 131. This, in conjunction with the pair of arc-quenching grids 120, can then be cut into multiple small segments, or short arcs, significantly increasing the voltage drop across the arc.

[0071] As shown in Figures 21-24, a lower arc extinguishing grid groove 25 and an upper arc extinguishing grid groove 13 are respectively provided on the base 20" and the shell 10". The arc extinguishing grid 100 can be installed in the lower arc extinguishing grid groove 25 and the upper arc extinguishing grid groove 13 respectively, so that the arc extinguishing grid 100 is installed on the base 20" or the shell 10", and the arc extinguishing grid 100 is located above and below the arc-proof end contact group 701, that is, the contact group composed of the first moving contact 78 and the second static contact 77.

[0072] As shown in Figures 3-4, the first lead piece 71 and the second lead piece 72 are fixedly mounted on the base 20, and the first movable spring piece 73 and the second movable spring piece 74 are arranged side by side on the base 20. The first lead piece 71 and the second lead piece 72 are respectively connected to the first lead pin 30 and the second lead pin 40. Optionally, the first lead piece 71 and the second lead piece 72 can be integrally formed with the first lead pin 30 and the second lead pin 40, respectively.

[0073] As shown in Figures 2-4, the first movable spring 73 and the second movable spring 74 are arranged side by side within the first mounting slot 220 and are located on a side of the first mounting slot 220 away from the second mounting slot 230. The first movable spring 73 and the second movable spring 74 constitute a parallel movable spring assembly. The first lead-out piece 71 is fixedly connected to one end of the first movable spring 73, and the second lead-out piece 72 is fixedly connected to one end of the second movable spring 74. The first lead-out piece 71 and the second lead-out piece 72 are respectively located at different ends of the parallel movable spring assembly.

[0074] As shown in Figure 3, specifically, in this embodiment, the first movable spring 73 has a first fixed end and a first cantilever end. The first fixed end of the first movable spring 73 is fixedly connected to the first lead-out piece 71, so that the first movable spring 73 is in a cantilevered state. The second movable spring 74 has a second fixed end and a second cantilevered end. The second fixed end of the second movable spring 74 is fixedly connected to the second lead-out piece 72, so that the second movable spring 74 is in a cantilevered state. The first fixed end of the first movable spring 73 is opposite to the second cantilevered end of the second movable spring 74, and the first cantilevered end of the first movable spring 73 is opposite to the second fixed end of the second movable spring 74.

[0075] The first static contact 75 is arranged at the first fixed end of the first movable spring 73, the first movable contact 78 is arranged at the first cantilever end of the first movable spring 73, the second static contact 77 is arranged at the second fixed end of the second movable spring 74, and the second movable contact 76 is arranged on the second cantilever end of the second movable spring 74, and the first static contact 75 and the second movable contact 76 are arranged opposite to each other, and the first movable contact 78 and the second static contact 77 are arranged opposite to each other.

[0076] As shown in Figure 3, the magnetic circuit system 60 includes a coil 61, an armature assembly 62, a first push card 63, and a second push card 64. The armature assembly 62 is rotatably mounted on the base 20. The coil 61 is connected to the coil lead pin 50, which extends downward through the bottom surface of the base 20. The coil 61 is horizontally mounted in the second mounting slot 230. A permanent magnet is disposed in the middle of the armature assembly 62. The armature assembly 62 can be actuated by the coil 61, which has variable polarity, to rotate on the base 20. The first push card 63 and the second push card 64 are movably mounted on the base 20, and the two ends of the armature assembly 62 are respectively connected to one end of the first push card 63 and one end of the second push card 64, so that rotation of the armature assembly 62 causes the first push card 63 and the second push card 64 to move in opposite directions. The other end of the first push card 63 is connected to the first cantilever end of the first movable spring 73, and the other end of the second push card 64 is connected to the second cantilever end of the second movable spring 74, so that the first push card 63 and the second push card 64 move in opposite directions, respectively, so that the two sets of movable and static contacts, namely the first static contact 75 and the second movable contact 76, and the first movable contact 78 and the second static contact 77, are connected or disconnected together.

[0077] In addition, although the above embodiment is illustrated by using the enhanced arc extinguishing structure applied to the magnetic holding relay as an example, the enhanced arc extinguishing structure has the function of enhancing arc extinguishing, so it can also be used as an enhanced arc extinguishing structure in other switching electrical appliances, such as air switches, contactors, etc.

[0078] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0079] Although alternative embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they become aware of the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including alternative embodiments and all changes and modifications that fall within the scope of the present invention.

[0080] The above is a detailed introduction to the technical solution provided by the present application. Specific examples are used herein to illustrate the principles and implementation methods of the present application. At the same time, for those skilled in the art, according to the principles and implementation methods of the present application, there may be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present application.

Claims

1. A switch device, comprising a contact system, wherein: The contact system includes two groups of contact groups, which are arc-proof end contact groups and current-carrying end contact groups respectively, and each of the two groups of contact groups includes at least one pair of moving and static contacts; when the contact system is disconnected, the gap between the moving and static contacts of the arc-proof end contact group is smaller than the gap between the moving and static contacts of the current-carrying end contact group; wherein a permanent magnet is arranged on the periphery of the arc-proof end contact group.

2. The switch device according to claim 1, wherein: The arc-proof end contact group includes a first moving contact and a second static contact, and the current-carrying end contact group includes a first static contact and a second moving contact; the contact system also includes a first moving spring and a second moving spring, the first static contact and the first moving contact are respectively arranged at the two ends of the length direction of the first moving spring, the second static contact and the second moving contact are respectively arranged at the two ends of the length direction of the second moving spring, the first static contact and the second moving contact are respectively arranged opposite to each other, and the first moving contact and the second static contact are arranged opposite to each other.

3. The switch device according to claim 1 or 2, wherein: The switch device also includes a base, and the contact system is installed on the base. The direction close to the base is defined as downward, and the direction away from the base is defined as upward. Ceramic sheets are also arranged above and below the arc-proof end contact group, and the permanent magnet is arranged on the side of the arc-proof end contact group so that it is located on the periphery of the arc-proof end contact group.

4. The switch device according to claim 2, wherein: The switch electrical appliance also includes a base, and the contact system is installed on the base, with the direction close to the base being defined as downward and the direction away from the base being defined as upward. Ceramic sheets are also provided above and below the arc-proof end contact group, and the permanent magnet is provided on the side of the arc-proof end contact group so that it is located at the periphery of the arc-proof end contact group; the ceramic sheet includes a first part and a second part connected to each other, the first part and the second part being perpendicular to each other, the first part being in the shape of a sheet, and the second part being in the shape of a plate that is thin in the middle and thick on both sides, and a notch is provided in the thin middle part, the notch is in the shape of an arc, and the diameter of the notch is larger than the contact diameter of the arc-proof end contact group, so that after the ceramic sheet is installed, the second part is at least partially located between the first moving spring sheet and the second moving spring sheet, and the notch is directly opposite to the contact and is at least partially arranged around the contact.

5. The switch device according to claim 1 or 2, wherein: The switch electrical appliance also includes a base, and the contact system is installed on the base. The direction close to the base is defined as downward, and the direction away from the base is defined as upward. Arc extinguishing grids are also provided above and below the arc-proof end contact group, and the permanent magnet is provided on the side of the arc-proof end contact group so that it is located on the periphery of the arc-proof end contact group.

6. The switch device according to claim 5, wherein: The arc extinguishing grid comprises a grid seat, arc extinguishing grid pieces and arc striking grid pieces. The grid seat is provided with a plurality of slots parallel to each other. The arc extinguishing grid pieces and arc striking grid pieces are inserted into the slots, so that each of the arc extinguishing grid pieces and arc striking grid pieces are arranged parallel to each other.

7. The switch device according to claim 6, wherein: The number of the arc-extinguishing grids is more than 2, the arc-extinguishing grids are of equal length and have flush ends, an arc-extinguishing notch is provided at the end of each of the arc-extinguishing grids, and an arc-striking fold is provided at the end of the arc-striking grid that exceeds the end of the arc-extinguishing grid and is inclined and bent toward the contact group.

8. The switch device according to claim 7, wherein: The switch device also includes a housing, and the arc-extinguishing grids arranged above and below the arc-proof end contact group are respectively installed on the housing and the base.

9. The switch device according to claim 1 or 2, wherein: The switch device also includes a base, and the contact system is installed on the base, with the direction close to the base being defined as downward and the direction away from the base being defined as upward. The permanent magnet is disposed above the arc-proof end contact group so that it is located at the periphery of the arc-proof end contact group, and a ceramic sheet is disposed at least in the left and right directions of the arc-proof end contact group.

10. The switch device according to claim 1, wherein: The permanent magnet is only arranged on the periphery of the arc-proof end contact group, but not on the periphery of the current-carrying end contact group.

11. The switch device according to claim 1, wherein: The switch device is a magnetic latching relay.

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