An arc extinguishing device for a dual power switch

Abstract

The present invention discloses an arc extinguishing device for a dual power switch. The arc extinguishing baffle structure is respectively rotatably arranged on the joint path between a moving contact and a second stationary contact and a third stationary contact, so as to cut off the arc generated by the separation of the moving and stationary contacts and the arc pulling caused by the separation, and the arc is quickly extinguished when the moving contact passes through the arc extinguishing piece assembly, so as to prevent the short circuit accident caused by the arc connecting the second stationary contact or the third stationary contact when the moving contact rotates and switches between the second stationary contact or the third stationary contact. The technical scheme is adopted to block and cut off the arc generated when the moving contact is disconnected from the second stationary contact or the third stationary contact by using the arc extinguishing baffle structure, so as to prevent arc pulling and arc pulling phenomena, reduce the burning damage caused by the arc to the moving and stationary contacts, reduce the temperature rise inside the dual power switch, greatly improve the arc extinguishing ability and arc extinguishing efficiency of the arc extinguishing device, and thus improve the breaking ability and service life of the dual power switch.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and in particular to an arc extinguishing device for a dual power switch. Background Art

[0002] The contact structure of the dual power switch directly affects the temperature rise of the switch as well as the connection and disconnection capabilities. When the contact structure disconnects the circuit in the atmosphere, as long as the voltage exceeds 12-20V and the current being disconnected exceeds 0.25-1A, an arc will usually be generated in the contact gap (also called the arc gap) to keep the current connected until the arc is extinguished and the contact gap becomes an insulating medium and the current is disconnected. The high temperature of the arc will burn the contacts, and copper ions will be left on the contact surface after the arc is extinguished.

[0003] Chinese patent document CN203070945U discloses a contact device of a dual power switch, including a moving contact and a stationary contact, the stationary contact including two contact pieces, the moving contact including two moving contact pieces, the two moving contact pieces forming a V shape, the moving contact being fixed on an insulating rotating shaft controlled by a transmission mechanism, the stationary contact including a stationary contact a for a main power incoming line, a stationary contact b for a standby power incoming line, and a stationary contact c for an outgoing line, the stationary contact a and the stationary contact b being fixed on an insulating base, the stationary contact c being fixed on the inner side of an insulating cover plate of the dual power switch However, when this contact device switches the main power supply and the backup power supply, an arc will be generated when the two ends of the moving contact are disconnected from the static contact. In the process of rapid switching, arcing will also occur, which can easily cause arcs to appear at both ends of the moving contact when switching the two static contacts, resulting in a short-circuit fault between the main power supply and the backup power supply, posing a safety hazard. In addition, the existing arc extinguishing chamber only absorbs arc extinguishing, but is not enough to quickly extinguish the arcing, which will cause burning damage to the moving and static contacts, increase the internal temperature rise of the dual power switch, and have poor arc extinguishing ability, affecting the performance and service life of the dual power switch. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem that when the dual power switch in the prior art switches the main power supply and the backup power supply, an arc is simultaneously generated at both ends of the moving contact, resulting in a short-circuit fault between the main power supply and the backup power supply, and the arc extinguishing ability is poor. The generated arc and arc pulling will cause burning damage to the moving and static contacts, affecting the performance and service life of the product, thereby providing an arc extinguishing device for the dual power switch that can quickly extinguish the arc, effectively avoid the short-circuit fault between the main power supply and the backup power supply caused by the arc connection, and reduce the burning of the moving and static contacts by the arc.

[0005] The present invention provides an arc extinguishing device for a dual power switch, comprising a housing and a moving contact rotatably arranged in the housing, and a first stationary contact, a second stationary contact, and a third stationary contact arranged in the housing around the moving contact, wherein the moving contact can be engaged with the first stationary contact and the second stationary contact or with the first stationary contact and the third stationary contact when being rotated by force, and further comprising:

[0006] An arc-extinguishing piece assembly surrounds the moving contact and is respectively arranged between the first stationary contact and the second stationary contact and between the first stationary contact and the third stationary contact, and the moving contact rotates through the arc-extinguishing piece assembly;

[0007] The arc-extinguishing chute structure is rotatably arranged on the engagement path between the moving contact and the second static contact and the third static contact, and the arc-extinguishing chute structure rotates forward to block the engagement path when the moving contact is separated from the second static contact or the third static contact, and is pushed by the moving contact to rotate reversely to release the blocking of the engagement path when the moving contact is engaged with the second static contact or the third static contact.

[0008] In the above-mentioned arc extinguishing device of the dual power switch, two groups of arc extinguishing chute structures are provided corresponding to the second static contact and the third static contact, one group of arc extinguishing chute structures is provided in the first gap formed between the arc extinguishing piece assembly and the second static contact, and another group of arc extinguishing chute structures is provided in the second gap formed between the arc extinguishing piece assembly and the third static contact.

[0009] In the above-mentioned arc extinguishing device of the dual power switch, each group of the arc extinguishing baffle structures includes an arc extinguishing baffle rotatably arranged in the shell, and an elastic member arranged between the arc extinguishing baffle and the shell, and the elastic member applies a biasing force to the arc extinguishing baffle to rotate close to one side of the engagement path.

[0010] In the above-mentioned arc extinguishing device of the dual power switch, a limit block located on the rotation path of the arc extinguishing baffle is provided on the housing, and the arc extinguishing baffle is in contact with the limit block under the action of the elastic member.

[0011] In the above-mentioned arc extinguishing device of the dual power switch, the arc extinguishing baffle includes a rotating shaft portion and a baffle body connected to the rotating shaft portion, and the elastic member is a torsion spring sleeved on the rotating shaft portion, one end of which abuts against the baffle body and the other end of which is located in a limiting groove formed in the shell.

[0012] In the above-mentioned arc extinguishing device of the dual power switch, the baffle body includes a driving panel pushed by the moving contact, and a support frame connected to the back of the driving panel, the support frame is integrally connected to the side wall of the rotating shaft portion, and one end of the elastic member cooperates with the support frame to abut against it.

[0013] In the above-mentioned arc extinguishing device of the dual power switch, the driving panel is an S-shaped arc surface structure, and the arc surface structure includes an arc-shaped concave surface that cooperates with the limit block and a arc-shaped convex surface that is pushed by the moving contact.

[0014] In the above-mentioned arc extinguishing device of the dual power switch, first transition contacts that cooperate with the moving contact are respectively extended outward on both sides of the first static contact, and second transition contacts and third transition contacts are respectively extended outward on the side engaged with the moving contact of the second static contact and the third static contact.

[0015] In the above-mentioned arc extinguishing device of the dual power switch, the arc extinguishing plate assembly comprises a plurality of arc extinguishing grid plates in a U-shaped structure, and the first transition contact is arranged at the opening of the arc extinguishing grid plates.

[0016] In the above-mentioned arc extinguishing device of the dual power switch, the moving contact is eccentrically arranged on the insulating rotating shaft, and both ends of the moving contact are bent ends formed by bending.

[0017] The technical solution of the present invention has the following advantages over the prior art:

[0018] 1. The arc extinguishing device of the dual power switch provided by the present invention is that when the moving contact rotates to connect the first static contact and the second static contact, it is disconnected from the third static contact. On the contrary, when the moving contact rotates to connect the first static contact and the third static contact, it is disconnected from the second static contact, thereby realizing the switching of the main power supply and the backup power supply. By rotatably setting an arc extinguishing chute structure on the joint path between the moving contact and the second static contact and the third static contact, the arc extinguishing chute structure rotates to block the joint path between the moving contact and the second static contact or the third static contact when the moving contact is separated from the two, thereby being able to cut off the arc generated by the separation of the moving and static contacts and the arc pulling caused by the separation, and quickly extinguishing the arc when the moving contact passes through the arc extinguishing piece assembly, thereby preventing the moving contact from When the head rotates and switches between the second static contact or the third static contact, a short circuit accident is caused by the arc connecting the second static contact or the third static contact. At the same time, when the moving contact engages with the third static contact or the second static contact, the arc extinguishing partition structure blocking the engagement path will be pushed away, and the closing movement of the moving contact will not be affected. By adopting the technical solution, the arc extinguishing partition structure is used to block and cut off the arc generated when the moving contact is disconnected from the second static contact or the third static contact, so as to prevent arcing and arc pulling, reduce the burning damage caused by the arc to the moving and static contacts, reduce the temperature rise inside the dual power switch, greatly improve the arc extinguishing ability and arc extinguishing efficiency of the arc extinguishing device, and thus improve the breaking capacity and service life of the dual power switch.

[0019] 2. The arc extinguishing device of the dual power switch provided by the present invention, when the moving contact rotates to engage with the second static contact or the third static contact, will push the arc extinguishing baffle to squeeze the elastic member to cause the elastic member to deform; and when the moving contact is separated from the second static contact or the third static contact, the elastic member elastically resets and applies a biasing force to the arc extinguishing baffle to rotate close to one side of the engagement path, so that the arc extinguishing baffle quickly rotates to block between the moving contact and the second static contact or the third static contact, and the rotation reaction speed is fast, thereby realizing the automatic resetting function of the arc extinguishing baffle, which plays a role in cutting off the arc and protecting the contacts.

[0020] 3. In the arc extinguishing device of the dual power switch provided by the present invention, the baffle body includes a driving panel pushed by the moving contact, and a support frame connected to the back of the driving panel, the driving panel and the rotating shaft are connected by the support frame, and the support frame is integrally formed with two triangular plates on the back of the driving panel, which effectively share the impact force on the driving panel and increase the overall strength of the baffle body, so that the driving panel is not easily deformed when colliding with the moving contact, thereby improving the service life of the product.

[0021] 4. The arc extinguishing device of the dual power switch provided by the present invention, the arc surface structure includes an arc-shaped concave surface that cooperates with the limit block and abuts against it, and an arc-shaped convex surface that is pushed by the moving contact. The arc-shaped concave surface and the arc-shaped convex surface are respectively cooperated with the limit block and the moving contact to abut against each other, so that the limit block and the moving contact respectively contact different parts of the baffle body, so that the two do not interfere with each other during use. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 A front view of the arc extinguishing device of the dual power switch provided by the present invention;

[0024] Figure 2 A schematic diagram of the structure of the arc extinguishing device of the dual power switch provided by the present invention;

[0025] Figure 3 A schematic diagram of the structure of the arc extinguishing device of the dual power switch provided by the present invention from another direction;

[0026] Figure 4 for Figure 2 A schematic diagram of the local enlarged structure of part A shown;

[0027] Description of reference numerals:

[0028] 1-housing; 11-first gap; 12-second gap; 13-limiting block; 14-limiting groove;

[0029] 2-moving contact; 21-insulating shaft; 22-bending end;

[0030] 3-first stationary contact; 31-first transition contact;

[0031] 4-second stationary contact; 41-second transition contact;

[0032] 5-third static contact; 51-third transition contact;

[0033] 6-arc extinguishing plate assembly; 61-arc extinguishing grid; 62-opening;

[0034] 7-arc extinguishing partition structure; 71-arc extinguishing baffle; 72-elastic member; 73-rotating shaft portion; 74-driving panel; 75-support frame; 76-arc-shaped concave surface; 77-arc-shaped convex surface. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. 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.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Example 1

[0040] The present embodiment is specifically described below in conjunction with the accompanying drawings:

[0041] The present invention provides Figure 1-4 The arc extinguishing device of a dual power switch shown in the figure comprises a housing 1 and a moving contact 2 rotatably arranged in the housing 1, and a first static contact 3, a second static contact 4, and a third static contact 5 arranged in the housing 1 around the moving contact 2. When the moving contact 2 is rotated by force, it has a main power supply connected state engaged with the first static contact 3 and the second static contact 4; and a standby power supply connected state engaged with the first static contact 3 and the third static contact 5, and a power-off state disconnected from the first static contact 3, the second static contact 4, and the third static contact 5. The moving contact 2 switches back and forth between "main power supply connected state-power-off state-standby power supply connected state", and also comprises:

[0042] The arc-extinguishing piece assembly 6 surrounds the moving contact 2 and is respectively arranged between the first static contact 3 and the second static contact 4 and between the first static contact 3 and the third static contact 5, and the moving contact 2 rotates through the arc-extinguishing piece assembly 6;

[0043] The arc extinguishing chute structure 7 is rotatably arranged on the engagement path between the moving contact 2 and the second static contact 4 and the third static contact 5, respectively. When the moving contact 2 is separated from the second static contact 4 or the third static contact 5, the arc extinguishing chute structure 7 is forwardly rotated to block the engagement path, and when the moving contact 2 is engaged with the second static contact 4 or the third static contact 5, it is pushed by the moving contact 2 to rotate in the reverse direction to release the blocking of the engagement path. In this article, the forward rotation and reverse rotation mentioned above refer to the two rotation directions of the arc extinguishing chute structure 7 being opposite, and do not represent the actual direction of its rotation.

[0044] The above implementation is the core technical solution of this embodiment. When the moving contact 2 is rotated to connect the first static contact 3 and the second static contact 4, it is disconnected from the third static contact 5. On the contrary, when the moving contact 2 is rotated to connect the first static contact 3 and the third static contact 5, it is disconnected from the second static contact 4, thereby realizing the switching of the main power supply and the backup power supply. The arc extinguishing chute structure 7 is respectively rotated to set on the joint path between the moving contact 2 and the second static contact 4 and the third static contact 5. When the moving contact 2 is separated from the second static contact 4 or the third static contact 5, the arc extinguishing chute structure 7 rotates to block the joint path between the two, thereby being able to cut off the arc generated by the separation of the moving and static contacts and the arcing caused by them, and the arc is quickly extinguished when the moving contact 2 passes through the arc extinguishing piece assembly 6, thereby preventing When the moving contact 2 rotates and switches between the second static contact 4 or the third static contact 5, a short circuit accident is caused due to the arc connecting the second static contact 4 or the third static contact 5. At the same time, when the moving contact 2 is engaged with the third static contact 5 or the second static contact 4, it will push away the arc extinguishing partition structure 7 blocking the engagement path, and will not affect the closing movement of the moving contact 2. By adopting the technical solution, the arc extinguishing partition structure 7 is used to block and cut off the arc generated when the moving contact 2 is disconnected from the second static contact 4 or the third static contact 5, so as to prevent arcing and arc pulling, reduce the burning damage caused by the arc to the moving and static contacts, reduce the temperature rise inside the dual power switch, and greatly improve the arc extinguishing ability and arc extinguishing efficiency of the arc extinguishing device, thereby improving the breaking capacity and service life of the dual power switch.

[0045] like Figure 1As shown, two groups of arc-extinguishing chute structures 7 are provided corresponding to the second static contact 4 and the third static contact 5. One group of arc-extinguishing chute structures 7 is provided in the first gap 11 formed between the arc-extinguishing piece assembly 6 and the second static contact 4, and another group of arc-extinguishing chute structures 7 is provided in the second gap 12 formed between the arc-extinguishing piece assembly 6 and the third static contact 5. By providing two groups of arc-extinguishing chute structures 7, when the moving contact 2 switches between the main power supply connected state and the backup power supply connected state, there is always one group of arc-extinguishing chute structures 7 on the engagement path of the moving contact 2, which plays a role in cutting off the arc, ensuring that when the moving contact 2 rotates and switches between the second static contact 4 and the third static contact 5, the main power supply and the backup power supply will not be short-circuited due to arc connection, so that it is safe and reliable to use, and at the same time, the arc extinguishing performance of the dual power switch is guaranteed.

[0046] As a specific structural setting, each group of the arc-extinguishing baffle structures 7 includes an arc-extinguishing baffle 71 rotatably arranged in the shell 1, and an elastic member 72 arranged between the arc-extinguishing baffle 71 and the shell 1. When the moving contact 2 rotates to engage with the second static contact 4 or the third static contact 5, the arc-extinguishing baffle 71 will be pushed to squeeze the elastic member 72 to cause the elastic member 72 to deform. When the moving contact 2 is separated from the second static contact 4 or the third static contact 5, the elastic member 72 elastically resets and applies a biasing force to the arc-extinguishing baffle 71 to rotate close to one side of the engagement path, so that the arc-extinguishing baffle 71 quickly rotates to block between the moving contact 2 and the second static contact 4 or the third static contact 5, and the rotation reaction speed is fast, thereby realizing the automatic reset function of the arc-extinguishing baffle 71, which plays a role in cutting off the arc and protecting the contacts.

[0047] like Figure 3 As shown, the housing 1 is provided with a limit block 13 located on the rotation path of the arc extinguishing baffle 71. The arc extinguishing baffle 71 rotates in cooperation with the elastic member 72 to abut against the limit block 13. The limit block 13 is used to block the arc extinguishing baffle 71 from continuing to rotate, thereby preventing the arc extinguishing baffle 71 from excessively rotating and colliding with the arc extinguishing sheet assembly 6, thereby improving the safety of the product when in use.

[0048] As a specific structural arrangement, the arc extinguishing baffle 71 includes a shaft portion 73 and a baffle body connected to the shaft portion 73. Figure 4 The elastic member 72 is a torsion spring sleeved on the rotating shaft portion 73, one end of which abuts against the baffle body, and the other end of which is located in the limiting groove 14 formed on the shell 1. The baffle body rotates around the rotating shaft portion 73 under the action of the torsion spring, and the limiting groove 14 is a notch between the protruding block formed on the shell 1 and the side wall of the shell 1.

[0049] Combine the following Figure 4 The specific structure of the baffle body is described in detail:

[0050] The baffle body includes a driving panel 74 pushed by the moving contact 2, and a support frame 75 connected to the back of the driving panel 74, the support frame 75 is integrally connected to the side wall of the rotating shaft portion 73, one end of the elastic member 72 cooperates with the support frame 75 to resist, the driving panel 74 and the rotating shaft are connected by the support frame 75, the support frame 75 is integrally formed with two triangular plates on the back of the driving panel 74, effectively sharing the impact force on the driving panel 74, increasing the overall strength of the baffle body, making it difficult for the driving panel 74 to deform when colliding with the moving contact 2, and improving the service life of the product.

[0051] As a specific structural setting, the drive panel 74 is an S-shaped arc surface structure. By setting the arc surface structure, the moving contact 2 is prevented from directly colliding with the drive panel 74, and a force buffering effect is played. The arc surface structure includes an arc-shaped concave surface 76 that cooperates with the limit block 13 and an arc-shaped convex surface 77 that is pushed by the moving contact 2. The arc-shaped concave surface 76 and the arc-shaped convex surface 77 are respectively cooperated with the limit block 13 and the moving contact 2 to make the limit block 13 and the moving contact 2 contact different parts of the baffle body respectively, so that the two do not interfere with each other during use.

[0052] like Figure 2-3 As shown, first transition contacts 31 that are in contact with the moving contact 2 are respectively extended outward from both sides of the first static contact 3, and second transition contacts 41 and third transition contacts 51 are respectively extended outward from the second static contact 4 and the third static contact 5 on the side engaged with the moving contact 2. By providing the first transition contact 31, the second transition contact 41 and the third transition contact 51, arcs are concentrated on the transition contacts when the moving contact 2 is disconnected from the static contact, thereby reducing the burning damage of the static contact by the arc and improving the service life of the product.

[0053] like Figure 1 As shown, the arc extinguishing sheet assembly 6 includes a plurality of arc extinguishing grids 61 in a U-shaped structure, and the first transition contact 31 is arranged at the opening 62 of the arc extinguishing grid 61, so as to ensure that the arc generated when the moving contact 2 and the first static contact 3 are disconnected can be transmitted to the arc extinguishing grid 61 assembly through the side wall of the first transition contact 31, and at the same time, the copper ions generated after the arc is cooled are concentrated on the side wall of the first transition contact 31, which can avoid the problem that the copper ions are generated on the surface of the first static contact 3 and interfere with the opening and closing of the moving contact 2 and the first static contact 3.

[0054] like Figure 3 As shown, the moving contact 2 is eccentrically arranged on the insulating rotating shaft 21, and both ends of the moving contact 2 are bent ends 22, so that the moving contact 2 is first separated from the second static contact 4 or the third static contact 5, and then separated from the first static contact 3, so that the arc is preferentially generated on the side of the second static contact 4 or the third static contact 5, and then isolated by the arc extinguishing partition structure 7, so that the arc extinguishing speed is faster and more convenient.

[0055] Combine the following Figure 1 The working principle of the arc extinguishing device of the dual power switch is described:

[0056] For example, when the main power supply connected state of the moving contact 2 is switched to the standby power supply connected state, one end of the moving contact 2 is separated from the second static contact 4 to generate an arc and release the blocking of the arc extinguishing chute structure 7 in the first gap 11, the arc extinguishing chute structure 7 rotates forward to the engagement path of the moving contact 2, cuts off the arc between the moving contact 2 and the second static contact 4, and uses the arc extinguishing piece assembly 6 to quickly extinguish the arc, one end of the moving contact 2 is engaged with the first static contact 3, and the other end of the moving contact 2 is separated from the first static contact 3. The arc is generated, the arc-extinguishing chute structure 7 in the second gap 12 is located on the engagement path of the moving contact 2, and the arc is blocked by the arc-extinguishing chute structure 7 so that it will not be connected to the third static contact 5. The arc is quickly extinguished by the arc-extinguishing sheet assembly 6, and then during the rotation of the moving contact 2, the arc-extinguishing chute structure 7 on this side is pushed to make the arc-extinguishing chute structure 7 rotate in the opposite direction away from the engagement path, so that the other end of the moving contact 2 is engaged with the third static contact 5, thereby completing the switching work between the main power supply on state and the standby power supply on state.

[0057] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the protection scope of the invention.

Claims

1. An arc extinguishing device for a dual power switch, comprising a housing (1) and a moving contact (2) rotatably arranged in the housing (1), and a first stationary contact (3), a second stationary contact (4), and a third stationary contact (5) arranged in the housing (1) around the moving contact (2); the moving contact (2) can engage with the first stationary contact (3) and the second stationary contact (4) or engage with the first stationary contact (3) and the third stationary contact (5) when the moving contact (2) is rotated by force, characterized in that , also includes: An arc extinguishing piece assembly (6) surrounds the moving contact (2) and is respectively arranged between the first stationary contact (3) and the second stationary contact (4) and between the first stationary contact (3) and the third stationary contact (5); the moving contact (2) rotates and passes through the arc extinguishing piece assembly (6); An arc extinguishing chute structure (7) is rotatably arranged on a connection path between the moving contact (2) and the second static contact (4) and the third static contact (5); the arc extinguishing chute structure (7) is forwardly rotated to block the connection path when the moving contact (2) is separated from the second static contact (4) or the third static contact (5); and when the moving contact (2) is engaged with the second static contact (4) or the third static contact (5), the arc extinguishing chute structure (7) is pushed by the moving contact (2) to rotate in the reverse direction to release the blocking of the connection path; wherein each group of the arc extinguishing chute structures (7) comprises an arc extinguishing baffle (71) rotatably arranged in the housing (1), and an elastic member (72) arranged between the arc extinguishing baffle (71) and the housing (1); when the moving contact (2) rotates to connect with the second static contact (4) or the third static contact (5), the arc extinguishing chute structure (7) is forwardly rotated to block the connection path; and when the moving contact (2) is engaged with the second static contact (4) or the third static contact (5), the arc extinguishing chute structure (7) is pushed by the moving contact (2) to rotate in the reverse direction to release the blocking of the connection path. When the second stationary contact (4) or the third stationary contact (5) is engaged, the arc extinguishing baffle (71) is pushed to squeeze the elastic member (72) so that the elastic member (72) is deformed; and when the moving contact (2) and the second stationary contact (4) or the third stationary contact (5) are separated, the elastic member (72) is elastically reset and applies a biasing force to the arc extinguishing baffle (71) to rotate close to one side of the engagement path, so that the arc extinguishing baffle (71) is quickly rotated to block between the moving contact (2) and the second stationary contact (4) or the third stationary contact (5); a limit block (13) located on the rotation path of the arc extinguishing baffle (71) is provided on the housing (1); and the arc extinguishing baffle (71) is matched and abutted against the limit block (13) under the action of the elastic member (72).

2. The arc extinguishing device of the dual power switch according to claim 1 is characterized in that Two groups of the arc-extinguishing chute structures (7) are provided corresponding to the second stationary contact (4) and the third stationary contact (5); one group of the arc-extinguishing chute structures (7) is provided in a first gap (11) formed between the arc-extinguishing piece assembly (6) and the second stationary contact (4); and another group of the arc-extinguishing chute structures (7) is provided in a second gap (12) formed between the arc-extinguishing piece assembly (6) and the third stationary contact (5).

3. The arc extinguishing device of the dual power switch according to claim 1 is characterized in that The arc-extinguishing baffle (71) comprises a rotating shaft portion (73) and a baffle body connected to the rotating shaft portion (73); the elastic member (72) is a torsion spring sleeved on the rotating shaft portion (73), one end of which abuts against the baffle body and the other end of which is located in a limiting groove (14) formed on the housing (1).

4. The arc extinguishing device for a dual power switch according to claim 3 is characterized in that The baffle body comprises a driving panel (74) pushed by the moving contact (2), and a support frame (75) connected to the back of the driving panel (74); the support frame (75) is integrally connected to the side wall of the rotating shaft portion (73); and one end of the elastic member (72) cooperates with and abuts against the support frame (75).

5. The arc extinguishing device of the dual power switch according to claim 4 is characterized in that The drive panel (74) is an S-shaped arc surface structure, and the arc surface structure comprises an arc-shaped concave surface (76) that cooperates with the limit block (13) and abuts against the arc-shaped convex surface (77) that is pushed by the moving contact (2).

6. The arc extinguishing device for a dual power switch according to any one of claims 1 to 5, characterized in that The first static contact (3) has first transition contacts (31) extending outwards from both sides thereof and mating with the moving contact (2); the second static contact (4) and the third static contact (5) have second transition contacts (41) and third transition contacts (51) extending outwards from the sides thereof engaging with the moving contact (2).

7. The arc extinguishing device of the dual power switch according to claim 6 is characterized in that The arc extinguishing plate assembly (6) comprises a plurality of arc extinguishing grid plates (61) having a U-shaped structure, and the first transition contact (31) is arranged at an opening (62) of the arc extinguishing grid plates (61).

8. The arc extinguishing device of the dual power switch according to claim 7 is characterized in that The moving contact (2) is eccentrically arranged on the insulating rotating shaft (21), and both ends of the moving contact (2) are bent ends (22) formed by bending.

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