Arc extinguishing device, relay frame and relay

Abstract

The invention discloses an arc extinguishing device, a relay frame and a relay, and relates to the field of relays, the arc extinguishing device comprises a first arc striking piece and a second arc striking piece which are arranged on the outer side of a gap connecting line of a movable contact and a static contact, and an arc guide channel is formed between the first arc striking piece and the second arc striking piece; the distance between the arc guiding channels is gradually increased in the direction away from the movable contact and the static contact, and the tail ends, away from one side of the movable contact and the static contact, of the arc guiding channels are provided with arc extinguishing grid sheet sets, so that electric arcs entering the arc guiding channels are broken into a plurality of small electric arcs. According to the arc extinguishing device, the arc is guided between the first arc striking sheet and the second arc striking sheet by means of the arc guiding channel, and is divided into a plurality of small arcs between the arc extinguishing grid sheet groups, so that rapid arc extinguishing is realized, long-time arc ablation of the contact is protected, rapid arc extinguishing is effectively realized, and the arc extinguishing capability of the device is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of arc extinguishing devices, and more specifically, to an arc extinguishing device, a relay frame and a relay. Background Art

[0002] With the rapid development of the solar photovoltaic industry, higher requirements are also put forward for relays used in solar photovoltaic inverters, especially for relay loads. According to market needs, the load voltage reaches 1000Va.c., the switching current needs to reach at least 100A, and the conduction current exceeds 320A. This type of relay usually requires a contact resistance of less than 0.3mΩ, and general silver tin oxide material contacts cannot be used due to their own body resistance, while silver nickel contacts have low body resistance but insufficient arc resistance.

[0003] In summary, how to improve the arc extinguishing capability of the relay so that the relay can use silver-nickel contacts and meet the contact resistance requirements is a problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an arc extinguishing device, a relay frame and a relay, which can effectively achieve rapid arc extinguishing and improve the arc extinguishing ability of the device.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An arc extinguishing device is used to be installed in a relay, a contactor or a circuit breaker, wherein the relay, the contactor or the circuit breaker has at least one group of corresponding moving contacts and static contacts, and the arc extinguishing device includes a first arc-striking plate and a second arc-striking plate arranged outside the gap connecting the moving contact and the static contact, an arc-guiding channel is formed between the first arc-striking plate and the second arc-striking plate, the spacing of the arc-guiding channels gradually increases in a direction away from the moving contact and the static contact, and an arc-extinguishing grid group is arranged at the end of the arc-guiding channel on the side away from the moving contact and the static contact, so that the arc entering the arc-guiding channel is broken into a plurality of small arcs.

[0007] Preferably, the first arc-striking piece and the second arc-striking piece are both arc-shaped structures, and the surfaces of the first arc-striking piece and the second arc-striking piece are smoothly arranged.

[0008] Preferably, the arc-extinguishing grid plate group includes a plurality of arc-extinguishing grids arranged at equal intervals, and the distance between every two adjacent arc-extinguishing grids is smaller than the distance between the first arc-striking plate and the second arc-striking plate.

[0009] Preferably, the arc extinguishing grid group further includes an arc extinguishing hood, which is located at the end of the arc guiding channel on the side away from the moving contact and the static contact, and a plurality of arc extinguishing grids are equidistantly inserted in the arc extinguishing hood.

[0010] Preferably, the first arc-striking plate, the second arc-striking plate and the arc-extinguishing grid are all made of electrical pure iron and are copper-plated on the surface.

[0011] Preferably, the distance between the first arc-striking piece and the second arc-striking piece is greater than the gap distance between the moving contact and the static contact.

[0012] A relay frame comprises a base, in which an arc extinguishing device as described above is arranged, a first mounting plate and a second mounting plate are respectively arranged at the installation positions of the first arc-striking piece and the second arc-striking piece in the base, and an arc-shaped channel for installing the first arc-striking piece and the second arc-striking piece is formed between the first mounting plate and the second mounting plate.

[0013] Preferably, a cavity is formed in the base at one end of the arc guiding channel close to the arc extinguishing grid group, and the cavity is communicated with the arc guiding channel.

[0014] Preferably, a partition is provided in the base, and the partition is located between the arc-shaped channel and the cavity to separate the arc-shaped channel from the cavity.

[0015] A relay, comprising any one of the relay frames described above, wherein two static springs are arranged opposite to each other on the base, each of the static springs is provided with a static contact, a guide bridge is arranged on the base, both ends of the guide bridge are provided with moving contacts, and each of the moving contacts is arranged in cooperation with the corresponding static contact;

[0016] The arc-shaped channels are formed in two groups and are respectively located outside the gap connection lines between the two groups of moving contacts and the static contacts. Each of the arc-shaped channels is provided with the arc extinguishing device described in any one of the above items.

[0017] Preferably, the first arc-starting piece is arranged close to the static spring piece, and the second arc-starting piece is arranged close to the guide bridge;

[0018] The distance between the first arc-starting piece and the static spring piece is smaller than the gap distance between the moving contact and the static contact;

[0019] The distance between the second arc-starting piece and the guide bridge is smaller than the gap distance between the moving contact and the static contact.

[0020] Preferably, the sum of the distance between the first arc-striking piece and the static spring piece, the distance between the second arc-striking piece and the guide bridge, and the distance between the first arc-striking piece and the second arc-striking piece is greater than the gap distance between the moving contact and the static contact when the relay is in a released state.

[0021] The arc extinguishing device provided by the present invention guides the arc between the first arc-striking plate and the second arc-striking plate with the help of an arc guide channel, and is divided into a plurality of small arcs between the arc extinguishing grid plate groups, thereby achieving rapid arc extinguishing, thereby protecting the contacts from long-term arc erosion, effectively achieving rapid arc extinguishing, and improving the arc extinguishing ability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 Schematic diagram of the arc extinguishing device structure in this embodiment;

[0024] Figure 2 Schematic diagram of the relay frame structure in this embodiment;

[0025] Figure 3 This is a cross-sectional view of the interior of the relay in this embodiment;

[0026] Figure 4 Schematic diagram of the structure of the first arc-starting piece in this embodiment;

[0027] Figure 5 Schematic diagram of the structure of the second arc-starting piece in this embodiment;

[0028] Figure 6 Schematic diagram of the structure of the arc extinguishing grid in this embodiment.

[0029] Figure 1-Figure 6 , the reference numerals include:

[0030] 1. Base; 11. First mounting plate; 12. Second mounting plate; 13. Partition plate; 2. Static spring sheet; 3. First arc-starting sheet; 4. Second arc-starting sheet; 5. Arc-extinguishing grid sheet group; 51. Arc-extinguishing grid; 7. Static contact; 8. Moving contact; 9. Guide bridge; 10. Cavity. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Unless otherwise defined, the technical terms or scientific terms used in the disclosure of this application shall have the usual meanings understood by persons with ordinary skills in the field to which the invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly. The embodiments of the present application disclose an arc extinguishing device, a relay frame and a relay.

[0033] The core of the present invention is to provide an arc extinguishing device, a relay frame and a relay.

[0034] Please refer to Figures 1 to 6 .

[0035] The arc extinguishing device provided by the present invention includes a first arc-striking plate 3 and a second arc-striking plate 4 which are arranged outside the gap line between the moving contact 8 and the static contact 7. An arc-guiding channel is formed between the first arc-striking plate 3 and the second arc-striking plate 4. The spacing of the arc-guiding channels gradually increases in the direction away from the moving contact 8 and the static contact 7. An arc-extinguishing grid group 5 is arranged at the end of the arc-guiding channel on the side away from the moving contact 8 and the static contact 7 so that the arc entering the arc-guiding channel can be broken into a number of small arcs.

[0036] Specifically, the arc extinguishing device can be installed in relays, contactors or circuit breakers, wherein contactors and circuit breakers are more commonly used and relays are less commonly used, and relays, contactors or circuit breakers have at least one set of corresponding moving contacts 8 and static contacts 7. The arc extinguishing device includes a first arc-striking piece 3 and a second arc-striking piece 4 arranged outside the gap connecting line between the moving contact 8 and the static contact 7, wherein the first arc-striking piece 3 and the second arc-striking piece 4 are both large arc structures, and the surfaces of the first arc-striking piece 3 and the second arc-striking piece 4 are both smoothly arranged, and the two can form a gradual channel with gradually increasing spacing under cooperation, and the gradual channel is the arc-guiding channel, and the first arc-striking piece 3 and the second arc-striking piece 4 are both provided with protrusions on both sides of the circumference, and the protrusions facilitate the installation of the first arc-striking piece 3 and the second arc-striking piece 4, wherein one end of the first arc-striking piece 3 is arranged close to the static contact 7, and one end of the second arc-striking piece 4 is arranged close to the moving contact 8, and the end faces of the other ends of the first arc-striking piece 3 and the second arc-striking piece 4 are arranged flat. An arc extinguishing grid group 5 is provided at the end of the arc guide channel on the side away from the moving contact 8 and the stationary contact 7, so that the arc entering the arc guide channel is broken into a number of small arcs.

[0037] The arc extinguishing device described above effectively solves the problem of arcs generated when the circuit is disconnected in an electrical switch (such as a relay, a contactor, or a circuit breaker). The arc is caused by the sudden interruption of the current at the moment of separation between the moving contact and the static contact, which leads to the ionization of the air between the contacts to form a conductive channel. This conductive channel will generate high temperature and strong light, causing corrosion to the contacts, and may even cause a short circuit or fire. The arc extinguishing device of the present invention forms an arc-guiding channel through the first arc-guiding plate and the second arc-guiding plate, and the spacing between them gradually increases, which can guide the arc to gradually lengthen along the channel, thereby reducing the energy density of the arc. As the arc lengthens, the voltage required to maintain the conduction increases, while the power supply voltage remains unchanged, so the arc is easier to extinguish. In addition, in conjunction with the arc-extinguishing grid group, when the arc enters the grid group, it will be divided into multiple small arcs. These small arcs are easier to cool and extinguish due to their short length and small current. At the same time, the cooling effect between the grids (such as through air convection or heat sink design) can also further accelerate the extinction of the arc.

[0038] The arc extinguishing device, relay frame and relay provided by the present invention are introduced in more detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] In a specific embodiment, reference Figures 1 to 3 The arc-extinguishing grid group 5 includes a plurality of arc-extinguishing grids 51 arranged at equal intervals, and the distance between every two adjacent arc-extinguishing grids 51 is smaller than the distance between the first arc-striking plate 3 and the second arc-striking plate 4 .

[0040] Specifically, the arc extinguishing grid group 5 is composed of a plurality of equally spaced arc extinguishing grids 51, and the plurality of arc extinguishing grids 51 can effectively divide and guide the arc, thereby accelerating the cooling and extinguishing of the arc. When the arc enters the arc extinguishing grid group 5 from the arc guide channel, it encounters a series of closely arranged arc extinguishing grids 51. Since the distance between adjacent grids is small, the arc is forced to be divided into a plurality of small arcs. The maintenance voltage of these small arcs is higher than that of the original arc, while the power supply voltage remains unchanged, so the small arcs are easier to extinguish. In addition, the heat exchange area between the divided arc and the surrounding gas is increased, which accelerates the cooling process of the arc. And by adjusting the spacing of the arc extinguishing grid 51, the arc can be guided to travel along a specific path, which helps to further extend the arc and reduce its energy density. When the arc passes through the grid group, it will constantly change direction, which increases the contact area between the arc and the grid, thereby improving the heat dissipation efficiency. At the same time, this path optimization can also reduce the direct impact of the arc on the grid and extend the service life of the grid.

[0041] Optionally, a V-groove is provided on one side of the arc extinguishing grid 51 near the contact. The design of the V-groove makes the arc extinguishing grid 51 more complex in physical structure. When the arc contacts the arc extinguishing grid 51, it will be guided by the V-groove and divided into more small arcs. These small arcs are easier to cool and extinguish due to their shorter length and smaller current. And because the V-groove can guide the arc to distribute along a wider path, the concentrated erosion of the arc on a specific area of ​​the grid is reduced. This dispersion effect extends the service life of the grid and reduces the risk of performance degradation due to arc erosion. The design of the V-groove can also optimize the dynamic effect during the arc extinguishing process. When the arc burns on the grid, it generates a magnetic field and an electromagnetic force. The geometry of the V-groove can affect the distribution of these magnetic fields and electromagnetic forces, thereby helping to guide the arc to extinguish faster.

[0042] On the basis of any of the above embodiments, the first arc-striking piece 3 is insulated from the contact circuit, the second arc-striking piece 4 is insulated from the contact circuit, the arc-extinguishing grid 51 is insulated from the contact circuit, and the first arc-striking piece 3, the second arc-striking piece 4 and the arc-extinguishing grid 51 are also insulated from each other. The first arc-striking piece 3, the second arc-striking piece 4 and the arc-extinguishing grid 51 are all made of conductive metal materials. Specifically, the first arc-striking piece 3, the second arc-striking piece 4 and the arc-extinguishing grid 51 can be made of electrical pure iron with copper plating on the surface.

[0043] Based on any of the above embodiments, Figures 1 to 3 The arc extinguishing grid group 5 also includes an arc extinguishing hood, which is located at the end of the arc guiding channel on the side away from the moving contact 8 and the static contact 7, and a plurality of arc extinguishing grids 51 are equidistantly inserted in the arc extinguishing hood.

[0044] Specifically, the arc extinguishing hood provides installation space for the arc extinguishing grid 51. By inserting the arc extinguishing grid 51 into the arc extinguishing hood at equal distances, a compact and efficient arc extinguishing system is formed. This layout ensures that the arc can be fully divided and cooled when passing through the grid group, thereby improving the arc extinguishing efficiency.

[0045] Based on any of the above embodiments, Figures 1 to 3 , the distance between the first arc-striking piece 3 and the second arc-striking piece 4 is greater than the gap distance between the moving contact 8 and the static contact 7.

[0046] Specifically, when the moving contact 8 and the static contact 7 begin to separate and an arc is generated, the arc is more easily attracted and guided by the two arc-striking sheets because the distance between the first arc-striking sheet 3 and the second arc-striking sheet 4 close to the moving contact 8 and the static contact 7 is smaller. This ensures that the arc can quickly and accurately enter the arc-guiding channel, avoiding the irregular diffusion and burning of the arc in the contact gap, thereby reducing the erosion and damage of the arc to the contacts. After entering the arc-guiding channel, the arc will be elongated as the channel gradually expands. Since the initial distance between the first arc-striking sheet 3 and the second arc-striking sheet 4 is small, the arc is effectively elongated in the initial stage, which helps to increase the contact area between the arc and the surrounding air and accelerate the cooling process of the arc. At the same time, the elongated arc is also more susceptible to the action of the arc-extinguishing grid group 5 and is divided into multiple small arcs, further improving the arc-extinguishing efficiency.

[0047] Please refer to Figures 1 to 3 .

[0048] The relay frame provided by the present invention includes a base 1, in which the above-mentioned arc extinguishing device is arranged, and a first mounting plate 11 and a second mounting plate 12 are respectively arranged at the installation positions of the first arc-striking plate 3 and the second arc-striking plate 4 in the base 1, and an arc-shaped channel for installing the first arc-striking plate 3 and the second arc-striking plate 4 is formed between the first mounting plate 11 and the second mounting plate 12.

[0049] Specifically, the arc channel formed by the first mounting plate 11 and the second mounting plate 12 in the base 1 can better facilitate the installation of the first arc-striking plate 3 and the second arc-striking plate 4. The first arc-striking plate 3 and the second arc-striking plate 4 are respectively arranged on one side of the arc channel. The setting of the arc channel is conducive to the smooth entry of the arc plasma into the arc extinguishing chamber.

[0050] The above-mentioned relay frame can be better configured to cooperate with the arc extinguishing device, which is convenient for installing the first arc-striking piece 3 and the second arc-striking piece 4, and also has the functions and effects possessed by the above-mentioned arc extinguishing device.

[0051] Based on any of the above embodiments, Figures 1 to 3A cavity 10 is formed in the base 1 at one end of the arc guiding channel close to the arc extinguishing grid group 5, and the cavity 10 is connected to the arc guiding channel.

[0052] Specifically, the cavity 10 is arranged at the tail of the arc guide channel, which can be surrounded by a new mounting plate in the base 1, or the cavity 10 can be formed by extending the first mounting plate 11 and the second mounting plate 12. The cavity 10 can effectively bear a large amount of heat generated by the arc extinguishing grid 51, thereby reducing the influence of temperature on the contacts. When the arc burns on the grid and is gradually cooled, divided and extinguished, a large amount of heat energy will be released. If these heat energies are not dissipated in time, they may cause thermal damage to the surrounding contacts and other electrical components. The existence of the cavity 10 is like a huge radiator, which can absorb and disperse this heat, thereby reducing the influence of temperature on the contacts and protecting other sensitive components inside the relay from high temperature. The cavity 10 also acts as an airflow channel. When the relay is working, the surrounding air may generate natural convection due to temperature differences. The design of the cavity 10 helps to guide these airflows so that they can more effectively take away the heat generated by the arc, further improving the heat dissipation efficiency.

[0053] Based on any of the above embodiments, Figures 1 to 3 A partition 13 is provided in the base 1 , and the partition 13 is located between the arc-shaped channel and the cavity 10 to separate the arc-shaped channel from the cavity 10 .

[0054] Specifically, the presence of the partition 13 ensures that the arc is guided to a specific area for extinguishing after passing through the arc channel, rather than being directly dispersed into the cavity 10. This path optimization helps to reduce the rebound and scattering of the arc, and improves the arc capture and extinguishing efficiency of the arc extinguishing grid group 5. At the same time, the partition 13, as part of the internal structure of the base 1, enhances the overall structural stability. It plays a supporting and reinforcing role, which helps to reduce the risk of structural deformation or damage caused by vibration or impact.

[0055] Please refer to Figures 1 to 3 .

[0056] A relay provided by the present invention comprises the above-mentioned relay frame, two static spring pieces 2 are arranged opposite to each other on the base 1, each static spring piece 2 is provided with a static contact 7, a guide bridge 9 is arranged on the base 1, and moving contacts 8 are arranged at both ends of the guide bridge 9, each moving contact 8 is arranged in coordination with the corresponding static contact 7, two groups of arc-shaped channels are formed together, and are respectively located outside the gap connection line between the two groups of moving contacts 8 and the static contacts 7, and the above-mentioned arc extinguishing device is arranged in each arc-shaped channel.

[0057] Specifically, two static springs 2 are arranged opposite to each other on the base 1, and each static spring 2 is cleverly installed with a static contact 7. These static contacts 7 serve as key connection points of the circuit, waiting to cooperate with the moving contact. On the other part of the base 1, the current guide bridge 9 carries moving contacts 8 at both ends, which are precisely designed to cooperate with the corresponding static contacts 7 to achieve the on-off of the circuit. The two groups of arc channels are respectively located outside the gap connecting line between the two groups of moving contacts 8 and the static contacts 7. It not only ensures that the arc can be quickly and accurately guided into the arc channel when it is generated, but also avoids the potential damage of the arc to the surrounding components. Each arc channel is equipped with the above-mentioned arc extinguishing device. These arc extinguishing devices include key components such as the first arc-starting piece 3, the second arc-starting piece 4, and the arc-extinguishing grid piece group 5, which can quickly capture, split and extinguish the arc, thereby ensuring the safety and reliability of the relay when disconnecting the circuit. When the relay needs to disconnect the circuit, the moving contact 8 and the static contact 7 begin to separate, generating an arc. At this time, the first arc-starting piece 3 and the second arc-starting piece 4 intervene quickly to guide the arc into the arc channel. Subsequently, the arc travels along the arc channel, and is effectively extinguished after being divided and cooled by the arc-extinguishing grid group 5 for many times.

[0058] Based on any one of the above embodiments, the first arc-striking piece 3 is arranged close to the static reed piece 2, and the second arc-striking piece 4 is arranged close to the guide bridge 9; the distance between the first arc-striking piece 3 and the static reed piece 2 is smaller than the gap distance between the moving contact 8 and the static contact 7; the distance between the second arc-striking piece 4 and the guide bridge 9 is smaller than the gap distance between the moving contact 8 and the static contact 7.

[0059] Specifically, the distance between the first arc-striking piece 3 and the static spring piece 2 is smaller than the gap distance between the moving contact 8 and the static contact 7. This means that when the moving contact 8 begins to separate from the static contact 7 and the arc first appears, the first arc-striking piece 3 can quickly and accurately capture the trace of the arc and guide it into the preset arc channel. Similarly, the distance between the second arc-striking piece 4 and the guide bridge 9 is also smaller than the gap between the moving and static contacts to ensure that the arc can be guided promptly and effectively on the other side.

[0060] Based on any of the above embodiments, the sum of the distance between the first arc-striking piece 3 and the static reed piece 2, the distance between the second arc-striking piece 4 and the guide bridge 9, and the distance between the first arc-striking piece 3 and the second arc-striking piece 4 is greater than the gap distance between the moving contact 8 and the static contact 7 when the relay is in the released state.

[0061] Specifically, when the relay needs to disconnect the circuit and the moving contact 8 and the static contact 7 begin to separate, an arc will be generated between the two contacts. Since the sum of the three distances is set to be greater than the gap between the moving and static contacts, this means that at the moment the arc is generated, both the first arc-starting plate 3 and the second arc-starting plate 4 have enough space to capture and guide the arc. At the same time, this design also ensures that the arc will not be hindered in the guiding process, and can smoothly enter the arc channel and travel along the preset path to the arc-extinguishing grid group 5 for extinguishing.

[0062] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0063] The above is a detailed introduction to an arc extinguishing device, a relay frame and a relay provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. An arc extinguishing device, for installation in a relay, a contactor or a circuit breaker, wherein the relay, the contactor or the circuit breaker has at least one set of corresponding moving contacts (8) and stationary contacts (7), characterized in that: The arc extinguishing device comprises a first arc-striking piece (3) and a second arc-striking piece (4) arranged outside a gap connecting the moving contact (8) and the stationary contact (7); an arc-guiding channel is formed between the first arc-striking piece (3) and the second arc-striking piece (4); the spacing of the arc-guiding channel gradually increases in a direction away from the moving contact (8) and the stationary contact (7); an arc-extinguishing grid piece group (5) is arranged at the end of the arc-guiding channel on a side away from the moving contact (8) and the stationary contact (7), so that an arc entering the arc-guiding channel is split into a plurality of small arcs.

2. An arc extinguishing device according to claim 1, characterized in that: The first arc-striking piece (3) and the second arc-striking piece (4) are both arc-shaped structures, and the surfaces of the first arc-striking piece (3) and the second arc-striking piece (4) are arranged to be smooth.

3. An arc extinguishing device according to claim 1, characterized in that: The arc-extinguishing grid plate group (5) comprises a plurality of arc-extinguishing grids (51) arranged at equal intervals, and the distance between every two adjacent arc-extinguishing grids (51) is smaller than the distance between the first arc-striking plate (3) and the second arc-striking plate (4).

4. An arc extinguishing device according to claim 3, characterized in that: The arc extinguishing grid set (5) further comprises an arc extinguishing hood, the arc extinguishing hood being located at the end of the arc guiding channel on a side away from the moving contact (8) and the stationary contact (7), and a plurality of arc extinguishing grids (51) being inserted into the arc extinguishing hood at equal distances.

5. The arc extinguishing device according to claim 3, characterized in that: The first arc-striking piece (3), the second arc-striking piece (4) and the arc-extinguishing grid (51) are all made of electrical pure iron with copper plating on the surface.

6. An arc extinguishing device according to any one of claims 1 to 5, characterized in that: The distance between the first arc-striking piece (3) and the second arc-striking piece (4) is greater than the gap distance between the moving contact (8) and the stationary contact (7).

7. A relay frame, characterized in that: The invention comprises a base (1), wherein the base (1) is provided with an arc extinguishing device according to any one of claims 1 to 6, wherein a first mounting plate (11) and a second mounting plate (12) are respectively provided at mounting positions of the first arc-striking piece (3) and the second arc-striking piece (4) in the base (1), and an arc-shaped channel for mounting the first arc-striking piece (3) and the second arc-striking piece (4) is formed between the first mounting plate (11) and the second mounting plate (12).

8. A relay frame according to claim 7, characterized in that: A cavity (10) is formed in the base (1) at one end of the arc guiding channel close to the arc extinguishing grid plate group (5), and the cavity (10) is in communication with the arc guiding channel.

9. A relay, characterized in that: Comprising a relay frame as claimed in any one of claims 7 or 8, wherein two static reeds (2) are arranged opposite to each other on the base (1), each of the static reeds (2) is provided with a static contact (7), a guide bridge (9) is arranged on the base (1), and moving contacts (8) are arranged at both ends of the guide bridge (9), and each of the moving contacts (8) is arranged in cooperation with the corresponding static contact (7); The arc-shaped channels are formed in two groups and are respectively located outside the gap connection lines between the two groups of moving contacts (8) and the static contacts (7), and the arc extinguishing device is arranged in each of the arc-shaped channels.

10. A relay according to claim 9, characterized in that: The first arc-starting piece (3) is arranged close to the static spring piece (2), and the second arc-starting piece (4) is arranged close to the guide bridge (9); The distance between the first arc-starting piece (3) and the static spring piece (2) is smaller than the gap distance between the moving contact (8) and the static contact (7); The distance between the second arc-starting piece (4) and the guide bridge (9) is smaller than the gap distance between the moving contact (8) and the static contact (7); The sum of the distance between the first arc-striking piece (3) and the static reed piece (2), the distance between the second arc-striking piece (4) and the guide bridge (9), and the distance between the first arc-striking piece (3) and the second arc-striking piece (4) is greater than the gap distance between the moving contact (8) and the static contact (7) in the released state of the relay.

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