Switch

Abstract

The invention discloses a switch, and relates to the technical field of electrical equipment. The switch comprises a rotating shaft, a first moving contact, a second moving contact and a static contact; the rotating shaft is rotationally connected to a shell of the switch, the first moving contact and the second moving contact are both installed on the rotating shaft and used for driving the first moving contact and the second moving contact to rotate along with the rotating shaft, and a containing cavity is formed between the first moving contact and the second moving contact. The static contact is located on a rotation path of the accommodating cavity, and when the switch is switched on, the static contact enters the accommodating cavity along with the rotation of the rotating shaft, and in the entering process, the static contact firstly contacts with the first moving contact and then contacts with the second moving contact; and during opening, the static contact moves out of the accommodating cavity along with the rotation of the rotating shaft, and is separated from the second moving contact and then separated from the first moving contact in the moving-out process. According to the switch provided by the invention, the energy density of the arc is improved, so that the arc is more easily guided into the arc extinguish chamber, and arc extinguish is facilitated.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of electrical equipment, and in particular, to a switch. Background Art

[0002] The moving contacts and stationary contacts of the switch generally generate arcs during the process of opening and closing. Long-term burning of the arcs will cause erosion of the internal components of the switch, shorten the service life of the switch, and even cause safety accidents.

[0003] To solve the above problems, the existing switch housing is equipped with an arc extinguishing chamber. The magnetic field is generated by the conductive circuit where the moving contact and the static contact are located, driving the arc into the arc extinguishing chamber. The long arc is cut into multiple short arcs by the arc extinguishing grid in the arc extinguishing chamber, thereby increasing the arc voltage and achieving arc extinguishing.

[0004] However, in switches provided with an arc extinguishing chamber, the arc extinguishing chamber sometimes fails to function well, resulting in arc erosion of the internal structure of the switch. Summary of the invention

[0005] In view of the above problems, an embodiment of the present application provides a switch, which arranges two moving contacts to contact or separate from the static contact at different times of opening and closing, thereby concentrating the arc between the static contact and the moving contact that first contacts the static contact and last separates from the static contact, thereby improving the energy density of the arc and making it easier for the arc to be guided into the arc extinguishing chamber, which is conducive to extinguishing the arc.

[0006] The switch provided in the present application includes a rotating shaft, a first moving contact, a second moving contact and a static contact; the rotating shaft is rotatably connected to the outer shell of the switch, the first moving contact and the second moving contact are both installed on the rotating shaft, the rotating shaft is used to drive the first moving contact and the second moving contact to rotate, and an accommodating chamber is provided between the first moving contact and the second moving contact; the static contact is located on the rotation path of the accommodating chamber, when the switch is closed, the static contact enters the accommodating chamber with the rotation of the rotating shaft, and in the process of entering, it first contacts with the first moving contact and then contacts with the second moving contact; when the switch is opened, the static contact moves out of the accommodating chamber with the rotation of the rotating shaft, and in the process of moving out, it first separates from the second moving contact and then separates from the first moving contact.

[0007] The first moving contact and the second moving contact are arranged on the rotating shaft, so that when the rotating shaft rotates, the first moving contact and the second moving contact can be driven to rotate simultaneously, and the relative position between the first moving contact and the second moving contact remains unchanged, and the accommodating cavity is always located between the first moving contact and the second moving contact. The static contact is located on the rotation path of the accommodating cavity, so that when the switch is closed, the first moving contact, the second moving contact and the accommodating cavity can simultaneously approach the static contact, and the static contact enters the accommodating cavity. Similarly, when the switch is opened, the first moving contact, the second moving contact and the accommodating cavity can simultaneously move away from the static contact, and the static contact moves out of the accommodating cavity. In the process of entering the accommodating cavity, the static contact first contacts with the first moving contact and then contacts with the second moving contact. In the process of moving out of the accommodating cavity, the static contact first separates from the second moving contact and then separates from the first moving contact. Therefore, the arc in the process of opening and closing the switch is only generated between the static contact and the first moving contact. Compared with the related technology in which the arc is generated both between the static contact and the first moving contact and between the static contact and the second moving contact, under the condition of a constant connected current, the energy density of the arc in the former is greater and it is easier to be introduced into the arc extinguishing chamber, which is conducive to achieving rapid arc extinguishing and reducing the arc ablation of the internal parts of the switch.

[0008] In some embodiments, the side wall of the static contact close to the accommodating cavity is inclined from the side close to the first moving contact to the side close to the second moving contact in a direction away from the accommodating cavity.

[0009] Through the above scheme, since the side of the static contact close to the first moving contact is used to contact with the first moving contact during the process of entering the accommodating chamber, and the side close to the second moving contact is used to contact with the second moving contact, therefore, when the side wall of the static contact close to the accommodating chamber is inclined from the side close to the first moving contact to the side close to the second moving contact toward the direction away from the accommodating chamber, during the process of entering the accommodating chamber, the side close to the first moving contact enters the accommodating chamber first, and the side close to the second moving contact enters the accommodating chamber later, thereby realizing that during the closing process, the static contact first contacts with the first moving contact and then contacts with the second moving contact. Similarly, during the process of moving the static contact out of the accommodating chamber, the side close to the second moving contact leaves the accommodating chamber first, and the side close to the first moving contact leaves the accommodating chamber later, thereby realizing that during the opening process, the static contact first separates from the second moving contact and then separates from the first moving contact.

[0010] In some embodiments, there is an angle between the side wall of the first moving contact close to the static contact and the side wall of the second moving contact close to the static contact, the intersection of the angle is located on the side where the rotating shaft is located, and the first moving contact is closer to the static contact than the second moving contact.

[0011] In the above case, it can be achieved that during the closing process, when the shaft rotates, the static contact first contacts with the first moving contact and then contacts with the second moving contact. Similarly, during the opening process, when the shaft rotates, the static contact first separates from the second moving contact and then separates from the first moving contact.

[0012] In some embodiments, the side wall of the first moving contact close to the static contact is coplanar with the side wall of the second moving contact close to the static contact, and a contact portion is protruding from the side wall of the first moving contact close to the static contact, and the contact portion is used to first contact and / or last separate from the static contact.

[0013] The contact part is arranged so that before the static contact enters the accommodating cavity, it first contacts the contact part, so that the static contact is connected to the first moving contact. Similarly, after the static contact leaves the accommodating cavity, the static contact is still in contact with the contact part, so that the static contact is connected to the first moving contact. Therefore, the above scheme can realize that when closing the switch, the static contact first contacts the first moving contact and then contacts the second moving contact; when opening the switch, the static contact first separates from the second moving contact and then separates from the first moving contact.

[0014] In some embodiments, a side of the contact portion close to the rotating shaft and the first moving contact has a stepped surface transition, and a side of the contact portion away from the rotating shaft and the first moving contact has a smooth surface transition.

[0015] Through the above scheme, no matter the contact part and the static contact are in contact first or separated last, before or after the above contact, the arc generated between the static contact and the first moving contact generally appears between the static contact and the contact part. Since the arc is more inclined to transfer along the smooth surface during the transfer along the surface of the conductor, the possibility of the arc transferring toward the direction of the rotating shaft is reduced by setting a step surface transition between the side of the contact part close to the rotating shaft and the first moving contact, and setting a smooth surface transition between the side of the contact part away from the rotating shaft and the first moving contact, which is conducive to the arc transferring along the smooth surface in the direction away from the rotating shaft, and this direction is generally closer to the arc extinguishing chamber. Therefore, the above setting of the present application is conducive to guiding the arc into the arc extinguishing chamber, thereby facilitating rapid arc extinguishing and reducing the arc ablation of the internal parts of the switch.

[0016] In some embodiments, along the radial direction of the rotating shaft, the length of the first moving contact is greater than the length of the second moving contact.

[0017] In some embodiments, the switch further comprises an arc extinguishing chamber, which is located on a side of the rotation region of the first moving contact away from the rotating shaft, and has a first opening, which faces the rotation region of the first moving contact.

[0018] In some embodiments, an arc striking angle is provided on the static contact, and the arc striking angle extends from the static contact to one side of the first opening, and the side wall of the arc striking angle close to the first opening is smoothly connected to the side wall of the static contact close to the accommodating cavity.

[0019] Through the above solution, the setting of the arc striking angle is conducive to leading the arc from the static contact to the arc extinguishing chamber, thereby facilitating rapid arc extinguishing and reducing arc erosion of the internal parts of the switch. In addition, the setting of the side wall of the arc striking angle close to the first opening and the side wall of the static contact close to the accommodating cavity being smoothly connected helps the arc striking angle reduce the obstruction to the arc during the arc striking process and accelerates the transfer of the arc to the arc extinguishing chamber.

[0020] In some embodiments, the arc extinguishing chamber includes a plurality of arc extinguishing grids; a gap is provided between the side wall of the arc striking angle close to the first opening and the first arc extinguishing grid, and the first arc extinguishing grid is the arc extinguishing grid closest to the arc striking angle.

[0021] Through the above scheme, multiple arc-extinguishing grids can divide the arc entering the arc-extinguishing chamber into multiple short arcs, and cool the arc airflow by exchanging heat with the arc, thereby accelerating the arc extinction. There is a gap between the side wall of the arc-starting angle close to the first opening and the first arc-extinguishing grid, and the gap allows the arc to enter, so that the first arc-extinguishing grid can cut the arc, increasing the number of times the arc is cut and accelerating the arc extinction.

[0022] In some embodiments, along the radial direction of the rotating shaft, the length of the first moving contact is greater than the length of the second moving contact. During the opening and closing process, the end of the first moving contact away from the rotating shaft is located in the first opening of the arc extinguishing chamber or directly opposite the first opening.

[0023] The above arrangement is conducive to allowing the arc generated between the first moving contact and the static contact to quickly enter the arc extinguishing chamber, thereby reducing the probability of the arc moving in the space outside the arc extinguishing chamber.

[0024] In some embodiments, during the opening and closing process, at least a portion of an end of the second moving contact away from the rotating shaft is not located in the first opening or directly opposite to the first opening.

[0025] Since the arc during the opening and closing of the switch is only generated between the static contact and the first moving contact, even if at least part of the end of the second moving contact away from the rotating shaft is not located in the first opening or directly opposite the first opening, it will not affect the arc entering the arc extinguishing chamber. Through the above scheme, the size of the arc extinguishing chamber can be made smaller, thereby reducing the production cost, and reducing the surface area of ​​the arc extinguishing grid facing the arc generating part, thereby reducing the resistance of the arc when entering the arc extinguishing chamber, which is conducive to the arc quickly entering the arc extinguishing chamber and reducing the probability of the arc moving in the space outside the arc extinguishing chamber.

[0026] In some embodiments, the arc extinguishing chamber also includes a first gas producing part and a second gas producing part, the first moving contact has a first contact point for contacting the static contact, and during the process of opening and closing the circuit, the first contact point forms a first motion trajectory, and the first gas producing part and the second gas producing part are respectively located on both sides of the first motion trajectory.

[0027] Through the above scheme, the first motion trajectory is the initial arc drawing trajectory before the arc enters the arc extinguishing chamber, and the first gas producing part and the second gas producing part are respectively arranged on both sides of the first motion trajectory, so that at the beginning of the arc generation, the high temperature airflow at the position of the arc can affect the first gas producing part and the second gas producing part, so that the first gas producing part and the second gas producing part are affected by the high temperature to release gas, and the air pressure between the first gas producing part and the second gas producing part rises, that is, there will be an air pressure difference between the arc extinguishing chamber close to the first moving contact and the side away from the first moving contact. Under the influence of the air pressure, the gas in the arc extinguishing chamber moves from the position close to the first moving contact to the direction away from the first moving contact. At this time, the arc will move along the moving direction of the gas in the arc extinguishing chamber, gradually exchange heat with the arc extinguishing grid during the movement and cool down, and finally cool down and extinguish in the arc extinguishing chamber, or cool down and extinguish after being discharged from the outlet of the arc extinguishing chamber. Therefore, the arrangement of the first gas producing part and the second gas producing part can accelerate the arc extinction.

[0028] In summary, the present application arranges the static contact, the first moving contact and the second moving contact of the switch so that, when closing the switch, the static contact first contacts with the first moving contact and then contacts with the second moving contact; when opening the switch, the static contact first separates from the second moving contact and then separates from the first moving contact, and the arc extinguishing chamber is located on the periphery of the rotating area of ​​the accommodating cavity, so that the arc in the opening and closing process is only generated between the static contact and the first moving contact. Therefore, when the connected current is constant, the energy density of the arc in the present application is greater and it is easier to be introduced into the arc extinguishing chamber, which is conducive to achieving rapid arc extinguishing and reducing the arc erosion of the internal parts of the switch.

[0029] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1A schematic diagram of the internal structure of a switch provided in this application.

[0032] Figure 2 It is a side view of the positional relationship among the first moving contact, the second moving contact and the stationary contact.

[0033] Figure 3 It is a schematic diagram of the structure of the first moving contact, the second moving contact and the static contact of the first type.

[0034] Figure 4 It is a schematic diagram of the structure of the second type of first moving contact, second moving contact and static contact.

[0035] Figure 5 for Figure 4 Schematic diagram of the structure of the first moving contact.

[0036] Figure 6 for Figure 1 A top view of the internal structure of the switch.

[0037] Figure 7 An exploded view of an arc extinguishing chamber provided in this application.

[0038] Figure 8 A schematic diagram of the internal structure of a switch in a closed state provided in one embodiment of the present application.

[0039] Fig. 9 A schematic diagram of the internal structure of a switch in an open state provided in one embodiment of the present application.

[0040] Explanation of the reference numerals: 10, rotating shaft; 20, first moving contact; 210, connecting portion; 220, contact portion; 221, stepped surface; 222, smooth surface; 30, second moving contact; 40, accommodating chamber; 50, static contact; 60, arc extinguishing chamber; 610, first opening; 630, first fixing member; 631, first positioning hole; 640, second fixing member; 641, second positioning hole; 650, arc extinguishing grid; 651, first arc extinguishing grid; 660, first gas producing member; 661, first positioning column; 670, second gas producing member; 671, second positioning column; 70, first supporting portion; 80, second supporting portion; 90, arc striking angle; A, side wall of static contact close to the accommodating chamber side; B, side wall of the first moving contact close to the static contact side; C, side wall of the second moving contact close to the static contact side. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0043] The terms "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover but not exclude other contents. The word "a" or "an" does not exclude the presence of a plurality.

[0044] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the switch of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the figures, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0045] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0046] In the description of the present application, unless otherwise specified, "plurality" means more than two (including two), and similarly, "multiple groups" means more than two groups (including two).

[0047] In the description of the present application, 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, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a fixing member, such as a fixed connection through a screw, bolt or other fixing member; the physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0048] A rotary isolating switch (hereinafter referred to as a switch) generally includes a rotating shaft, on which two sets of moving contacts are fixed, each set of moving contacts is used to contact or separate with a stationary contact to connect or disconnect two sets of circuits. Each set of moving contacts includes two identical moving contact pieces, which drive the two moving contact pieces to contact or separate with a stationary contact at the same time during the rotation of the rotating shaft. The arrangement of two moving contact pieces can increase the total contact area between the moving contact group and the stationary contact, and improve the reliability of the circuit connection.

[0049] Taking one set of moving contacts and stationary contacts as an example, during the process of opening or closing the switch, an arc will be generated between the moving contact and the stationary contact. Although the moving contact and the stationary contact are in a separated state due to the arc, the circuit where the moving contact and the stationary contact are located is still in a conducting state, and the arc causes the temperature inside the switch to rise sharply. If it is not extinguished in time, it will burn and damage the components of the switch.

[0050] In view of this, the present application embodiment provides a switch, please refer to Figure 1 and Figure 2 , Figure 1 A schematic diagram of the internal structure of a switch provided in this application, Figure 2 It is a side view of the positional relationship among the first moving contact, the second moving contact and the stationary contact.

[0051] like Figure 1 and Figure 2As shown, the switch provided by the present application includes a rotating shaft 10, a first moving contact 20, a second moving contact 30 and a static contact 50; the rotating shaft 10 is rotatably connected to the housing of the switch, the first moving contact 20 and the second moving contact 30 are both installed on the rotating shaft 10, the rotating shaft 10 is used to drive the first moving contact 20 and the second moving contact 30 to rotate, and a accommodating chamber 40 is provided between the first moving contact 20 and the second moving contact 30; the static contact 50 is located on the rotation path of the accommodating chamber 40, when the switch is closed, the static contact 50 enters the accommodating chamber 40 with the rotation of the rotating shaft 10, and in the process of entering, first contacts with the first moving contact 20, and then contacts with the second moving contact 30; when the switch is opened, the static contact 50 moves out of the accommodating chamber 40 with the rotation of the rotating shaft 10, and in the process of moving out, first separates from the second moving contact 30, and then separates from the first moving contact 20.

[0052] The accommodating cavity 40 is a cavity located between the first moving contact 20 and the second moving contact 30 , and at least two cavity walls of the cavity are respectively a side wall of the first moving contact 20 and a side wall of the second moving contact 30 .

[0053] When the rotating shaft 10 drives the first moving contact 20 and the second moving contact 30 to rotate simultaneously, the relative position between the first moving contact 20 and the second moving contact 30 remains unchanged, so the accommodating cavity 40 always exists between the first moving contact 20 and the second moving contact 30, and changes its position in real time with the rotation of the first moving contact 20 and the second moving contact 30.

[0054] Among them, the rotation area of ​​the accommodating chamber 40 refers to a set of areas consisting of all positions passed by the accommodating chamber 40 during the process of opening and closing the switch, and the set of areas is located between the rotation area of ​​the first moving contact 20 and the rotation area of ​​the second moving contact 30.

[0055] During the opening and closing processes, the rotation direction of the shaft 10 can be the same or different. In some examples, when closing the switch, the shaft rotates forward, and when opening the switch, the shaft rotates reversely. The forward rotation and the reverse rotation are two opposite rotation directions of the shaft 10. When the forward rotation is the clockwise rotation of the shaft 10, the reverse rotation is the counterclockwise rotation of the shaft 10. Similarly, when the forward rotation is the counterclockwise rotation of the shaft 10, the reverse rotation is the clockwise rotation of the shaft 10. Figure 1 In the view shown, positive rotation refers to the rotation of the shaft 10 in the counterclockwise direction, and reverse rotation refers to the rotation of the shaft 10 in the clockwise direction, that is, the counterclockwise rotation of the shaft 10 is the direction of closing the switch, and the clockwise rotation of the shaft 10 is the direction of opening the switch.

[0056] In the above embodiment of the present application, the first moving contact 20 and the second moving contact 30 are both mounted on the rotating shaft 10, so that when the rotating shaft 10 rotates, the first moving contact 20 and the second moving contact 30 can be driven to rotate simultaneously, and the relative position between the first moving contact 20 and the second moving contact 30 remains unchanged, and the accommodating chamber 40 is always located between the first moving contact 20 and the second moving contact 30. The static contact 50 is located on the rotation path of the accommodating chamber 40, so that when the rotating shaft 10 rotates forward, the first moving contact 20, the second moving contact 30 and the accommodating chamber 40 can simultaneously approach the static contact 50, and the static contact 50 enters the accommodating chamber 40. Similarly, when the rotating shaft 10 rotates reversely, the first moving contact 20, the second moving contact 30 and the accommodating chamber 40 can simultaneously move away from the static contact 50, and the static contact 50 moves out of the accommodating chamber 40. In the process of entering the accommodating cavity 40, the static contact 50 first contacts the first moving contact 20 and then contacts the second moving contact 30. In the process of moving out of the accommodating cavity 40, the static contact 50 first separates from the second moving contact 30 and then separates from the first moving contact 20, so that the arc in the opening and closing process is only generated between the static contact 50 and the first moving contact 20.

[0057] In order to extinguish the arc in time, the interior of the existing switch housing is generally equipped with an arc extinguishing unit, such as an arc extinguishing chamber, a magnetizing block, etc. The explanation is given when the arc extinguishing chamber is used as the arc extinguishing unit, but it is not limited to the arc extinguishing chamber. The arc extinguishing chamber is provided with a first opening and a first opening. The first opening is opposite to the part where the arc is generated inside the switch, and the first opening is opposite to the exhaust port on the switch housing, or has a channel between the exhaust port for airflow to pass through.

[0058] When an arc is generated between the static contact and the moving contact, a magnetic field is generated around the arc, and the magnetic force drives the arc into the arc extinguishing chamber. The arc extinguishing grid in the arc extinguishing chamber cuts the long arc into multiple short arcs, thereby increasing the arc voltage and cooling the arc, and finally extinguishing the arc. However, in switches with arc extinguishing chambers, the arc extinguishing chambers sometimes do not work well, resulting in arc erosion of the internal structure of the switch.

[0059] After research, the inventor found that this is because the magnetic force around the arc is too small, and the magnetic force is the driving force that drives the arc into the arc extinguishing chamber. The small magnetic force makes it difficult for the arc to overcome the resistance when entering the arc extinguishing chamber, making it difficult to enter the arc extinguishing chamber smoothly, and then burn for a long time, damaging the internal structure of the switch. The size of the magnetic force is not only related to the current size of the switch's conduction circuit, but also to the energy density of the arc when the arc is generated.

[0060] Since the current of the switch's conduction loop is affected by the switch's usage requirements and the switch's rated current, it is often difficult to increase the current of the switch's conduction loop while meeting the low current usage requirements. Therefore, to solve the problem of too little electromagnetic force around the arc, it is necessary to consider increasing the arc's energy density.

[0061] In some embodiments, the switch further includes an arc extinguishing chamber, which is located on a side of the rotation area of ​​the first moving contact away from the rotating shaft, and has a first opening, which faces the rotation area of ​​the first moving contact so that the arc enters the arc extinguishing chamber from the first opening.

[0062] Compared with the traditional switch structure, the two moving contacts are in contact with the static contact at the same time, resulting in the arc energy being small and dispersed between the static contact and the two moving contacts under the condition of small current connection and disconnection, and not easy to enter the arc extinguishing chamber, resulting in continuous arcing. The arc generated by this solution is concentrated between the first moving contact 20 and the static contact 50, and the arc column is narrower, which effectively realizes the concentration of arc energy, the energy density of the arc is greater, and the magnetic force around the arc is also greater, so that the arc generated under the condition of small current connection and disconnection is sufficient to overcome the resistance to enter the arc extinguishing chamber and enter the arc extinguishing chamber 60, thereby enhancing the arc extinguishing ability of the switch, which is conducive to achieving rapid arc extinguishing and reducing the arc ablation of the internal parts of the switch.

[0063] When the switch is closed, the shaft 10 rotates forward, and the static contact 50 enters the accommodating chamber 40 as the shaft 10 rotates, and contacts the first moving contact 20 first and then the second moving contact 30 during the entry process; when the switch is opened, the shaft 10 rotates reversely, and the static contact 50 moves out of the accommodating chamber 40 as the shaft 10 rotates, and separates from the second moving contact 30 first and then the first moving contact 20 during the movement process. There are many specific structures, and several possible implementation schemes for the above process are listed below.

[0064] Please continue to refer to Figure 2 ,exist Figure 2 In the embodiment shown, the side wall A of the stationary contact close to the accommodating cavity is formed from the side close to the first moving contact 20 ( Figure 2 left side) to the side close to the second moving contact 30 ( Figure 2 right side) in a direction away from the accommodation cavity 40 ( Figure 2 Lower center) Tilt setting.

[0065] The side wall A of the static contact close to the accommodating cavity refers to the side wall of the static contact 50 close to the rotation area of ​​the accommodating cavity 40 .

[0066] The direction away from the accommodating chamber 40 is the direction away from the rotation area of ​​the accommodating chamber 40 .

[0067] Since, in the process of the static contact 50 entering the accommodating chamber 40, the side close to the first moving contact 20 is used to contact the first moving contact 20, and the side close to the second moving contact 30 is used to contact the second moving contact 30, therefore, when the side wall A of the static contact close to the accommodating chamber is inclined from the side close to the first moving contact 20 to the side close to the second moving contact 30 toward the direction away from the accommodating chamber 40, in the process of the static contact 50 entering the accommodating chamber 40, the side close to the first moving contact 10 enters the accommodating chamber 40 first, and the side close to the second moving contact 30 enters the accommodating chamber 40 later, thereby achieving that during the closing process, the static contact 50 first contacts the first moving contact 20 and then contacts the second moving contact 30.

[0068] Similarly, when the static contact 50 moves out of the accommodating chamber 40, the side close to the second moving contact 30 leaves the accommodating chamber 40 first, and the side close to the first moving contact 20 leaves the accommodating chamber 40 later, so that during the opening process, the static contact 50 is separated from the second moving contact 30 first, and then from the first moving contact 20.

[0069] Reference Figure 3 , Figure 3 Schematic diagram of the structure of the second first moving contact 20, the second moving contact 30 and the static contact 50, as shown in Figure 3 As shown, in the second implementation scheme, there is an angle between the side wall B of the first moving contact close to the static contact and the side wall C of the second moving contact close to the static contact, the intersection of the angle is located on the side where the rotating shaft 10 is located, and the first moving contact 20 is closer to the static contact 50 than the second moving contact 30.

[0070] In the above case, when the switch is closed, the rotating shaft 10 rotates a small angle to achieve the contact between the static contact 50 and the first moving contact 20, and the static contact 50 and the second moving contact 30 can only be achieved after the rotating shaft 10 rotates further.

[0071] Therefore, the above scheme can achieve that during the closing process, the static contact 50 first contacts the first moving contact 20 and then contacts the second moving contact 30. Similarly, during the opening process, the static contact 50 first separates from the second moving contact 30 and then separates from the first moving contact 20.

[0072] Reference Figure 4 and Figure 5 , Figure 4 Schematic diagram of the structure of the first moving contact, the second moving contact and the static contact of the third type. Figure 5 for Figure 4 Schematic diagram of the structure of the first moving contact. Figure 4 and Figure 5As shown, in the third implementation scheme, the side wall B of the first moving contact close to the static contact is coplanar with the side wall C of the second moving contact close to the static contact, and a contact portion 220 is protruding from the side wall of the first moving contact 20 close to the static contact 50, and the contact portion 220 is used to first contact and / or last separate from the static contact 50.

[0073] The contact portion 220 may be used only for the first contact with the static contact 50 during the closing process, or may be used only for the last separation with the static contact 50 during the opening process, or may be used for both the first contact with the static contact 50 during the closing process and the last separation with the static contact 50 during the opening process. This is not limited in the embodiments of the present application.

[0074] The arrangement of the contact portion 220 allows the static contact 50 to contact the contact portion 220 before entering the accommodating chamber 40, thereby making the static contact 50 conductive with the first moving contact 20. Similarly, after the static contact 50 leaves the accommodating chamber 40, the static contact 50 still contacts the contact portion 220, thereby making the static contact 50 conductive with the first moving contact 20. Therefore, the above scheme can achieve that when closing the switch, the static contact 50 first electrically contacts the first moving contact 20 and then electrically contacts the second moving contact 30; when opening the switch, the static contact 50 first electrically separates from the second moving contact 30 and then electrically separates from the first moving contact 20.

[0075] Please continue to refer to Figure 5 In some embodiments, a step surface 221 transitions between the side of the contact portion 220 close to the rotating shaft 10 and the first moving contact 20 , and a smooth surface 222 transitions between the side of the contact portion 220 away from the rotating shaft 10 and the first moving contact 20 .

[0076] The transition of the step surface 221 means that the transition surface of the two parts has an obvious sharp angle.

[0077] The smooth surface 222 transition means that the transition surface between the two parts is a flat and smooth surface without any sharp corners.

[0078] It is understandable that no matter the contact portion 220 and the stationary contact 50 are in contact first or separated last, an arc will be generated between the stationary contact 50 and the contact portion 220 before or after the contact.

[0079] Since the arc tends to transfer along a smooth surface during its transfer along the surface of a conductor, a step surface 221 is set as a transition between the side of the contact portion 220 close to the rotating shaft 10 and the first moving contact 20, and a smooth surface 222 is set as a transition between the side of the contact portion 220 away from the rotating shaft 10 and the first moving contact 20. This reduces the possibility of the arc transferring toward the rotating shaft 10, and helps the arc transfer along the smooth surface 222 in a direction away from the rotating shaft 10, which is closer to the arc extinguishing chamber 60.

[0080] Therefore, the above-mentioned arrangement of the present application is conducive to guiding the arc into the arc extinguishing chamber 60, thereby facilitating rapid arc extinguishing and reducing the arc erosion of the internal parts of the switch.

[0081] Because the static contact 50 of the switch in the present application will respectively abut against the first moving contact 20 and the second moving contact 30 in the accommodating chamber 40 when the switch is closed, long-term use may cause the first moving contact 20 and the second moving contact 30 to move away from each other, and thus fail to be in close contact with the static contact 50, thereby making the conduction current of the switch unstable.

[0082] Therefore, if Figure 2 As shown, in some optional schemes, a first support portion 70 and a second support portion 80 are further provided on the rotating shaft 10. The first support portion 70 is provided on a side of the first moving contact 20 away from the second moving contact 30 and abuts against the first moving contact 20; the second support portion 80 is provided on a side of the second moving contact 30 away from the first moving contact 20 and abuts against the second moving contact 30.

[0083] The first support portion 70 may be of any shape or structure as long as it can abut against the first moving contact 20 . The first support portion 70 is used to support the first moving contact 20 to prevent the first moving contact 20 from being pressed by the stationary contact 50 and bending away from the second moving contact 30 .

[0084] Similarly, the present application has no special requirements for the shape or structure of the second support portion 80, as long as the second support portion 80 can abut against the second moving contact 30. The second support portion 80 is used to support the second moving contact 30 to prevent the second moving contact 30 from being squeezed by the stationary contact 50 and bending in a direction away from the first moving contact 20.

[0085] By providing the first support portion 70 and the second support portion 80, the first support portion 70 and the second support portion 80 can press against the first moving contact 20 and the second moving contact 30 from both sides, so that the first moving contact 20 and the second moving contact 30 are not easy to move away from each other under the long-term squeezing of the static contact 50. Therefore, during the long-term use of the switch, in the closed state, the static contact 50 can maintain close contact with the first moving contact 20 and the second moving contact 30 for a long time, which is beneficial to improve the stability of the conduction current of the switch and improve the reliability of the switch.

[0086] When the first moving contact 20 and the second moving contact 30 as above are used for opening and closing, the lengths of the first moving contact 20 and the second moving contact 30 may be the same or different. In a first implementation scheme, along the radial direction of the rotating shaft 10, the length of the first moving contact 20 is greater than the length of the second moving contact 30.

[0087] like Figure 1 , Figure 3 and Figure 4As shown, in some embodiments, an arc striking angle 90 is provided on the static contact 50, and the arc striking angle 90 extends from the static contact 50 to the side of the first opening 610 of the arc extinguishing chamber 60, and the side wall of the arc striking angle 90 close to the first opening 610 is smoothly connected to the side wall of the static contact 50 close to the accommodating cavity 40.

[0088] The arc striking angle 90 can be integrally or separately provided with the stationary contact 50. Accordingly, the connection between the arc striking angle 90 and the stationary contact 50 can be integrally formed, welded or abutted, etc., and the embodiment of the present application does not limit the connection method between the arc striking angle 90 and the stationary contact 50.

[0089] The side wall of the arc striking angle 90 close to the first opening 610 and the side wall of the static contact 50 close to the accommodating cavity 40 are smoothly connected, which means that there is no sharp corner after the side wall of the arc striking angle 90 close to the first opening 610 and the side wall of the static contact 50 close to the accommodating cavity 40 are connected.

[0090] In the process of transferring along the surface of the conductor, the arc tends to transfer along a smooth surface. Therefore, when the arc is generated between the side of the static contact 50 close to the accommodating cavity 40 and the first moving contact 20, the end of the arc close to the static contact 50 can be driven by magnetic force and can transfer along the static contact 50 to the side wall of the arc striking angle 90 close to the first opening 610, and then transfer along the side wall to the arc extinguishing chamber 60.

[0091] During the above-mentioned arc transfer process, the setting of the smooth connection between the side wall of the arc striking angle 90 close to the first opening 610 and the side wall of the static contact 50 close to the accommodating cavity 40 helps the arc striking angle 90 to reduce the obstruction of the arc during the arc striking process and accelerate the transfer of the arc to the arc extinguishing chamber 60, thereby facilitating rapid arc extinguishing and reducing the arc erosion of the internal parts of the switch.

[0092] like Figure 1 As shown, in some embodiments, the arc extinguishing chamber 60 includes a plurality of arc extinguishing grids 650 ; there is a gap between the side wall of the arc striking angle 90 close to the first opening 610 and the first arc extinguishing grid 651 , and the first arc extinguishing grid 651 is the arc extinguishing grid 650 closest to the arc striking angle 90 .

[0093] The plurality of arc extinguishing grids 650 can divide the arc entering the arc extinguishing chamber 60 into a plurality of short arcs, and cool the arc airflow by exchanging heat with the arc, thereby accelerating the extinguishing of the arc.

[0094] There is a gap between the side wall of the arc striking angle 90 close to the first opening 610 and the first arc extinguishing grid 651, and the gap allows the arc to enter, so that the first arc extinguishing grid 651 can cut the arc, increasing the number of times the arc is cut and accelerating the arc extinguishing. On the contrary, if there is no gap between the side wall of the arc striking angle 90 close to the first opening 610 and the first arc extinguishing grid 651, the arc will be directly introduced into the arc extinguishing chamber 60 without being cut by the first arc extinguishing grid 651, thereby reducing the total number of times the arc is cut by the arc extinguishing grid 650 of the arc extinguishing chamber 60, making it difficult for the arc to be extinguished.

[0095] It can be seen that the position setting of the arc striking angle 90 and the first arc extinguishing grid 651 in the above embodiment of the present application is not only conducive to the arc entering the arc extinguishing chamber 60, but also conducive to extinguishing the arc by increasing the number of times the arc is cut.

[0096] Please continue to refer to Figure 1 The arc extinguishing chamber 60 may further include a first fixing member 630 and a second fixing member 640 , the first fixing member 630 and the second fixing member 640 are arranged opposite to each other, and a plurality of arc extinguishing grids 650 are arranged between the first fixing member 630 and the second fixing member 640 .

[0097] For example, the first fixing member 630 and the second fixing member 640 may both be plate-shaped structures.

[0098] The first fixing member 630 and the second fixing member 640 can not only be used to fix the plurality of arc extinguishing grids 650 , but also can enclose the arc entering the arc extinguishing chamber 60 , limit the moving track and space of the arc, and reduce arc diffusion.

[0099] Please refer to Figure 6 , Figure 6 for Figure 1 A top view of the internal structure of the switch, such as Figure 6 As shown, in some embodiments, along the radial direction of the rotating shaft 10, the length of the first moving contact 20 is greater than the length of the second moving contact 30. During the opening and closing process, the end of the first moving contact 20 away from the rotating shaft 10 is located in the first opening 610 or directly opposite the first opening 610.

[0100] Based on the structure in which the first moving contact 20 and the second moving contact 30 successively contact or separate from the static contact 50 in the aforementioned embodiments of the present application, it can be known that although arcs will occur between the static contact 50 and the first moving contact 20, as well as between the static contact 50 and the second moving contact 30 during the process of the static contact 50 entering and moving out of the accommodating cavity 40, when the static contact 50 is completely separated from the accommodating cavity 40, only the arc between the static contact 50 and the first moving contact 20 which is closer to each other will be elongated, and external force is required to extinguish it.

[0101] Therefore, the above arrangement is conducive to allowing the arc generated between the first moving contact 20 and the static contact 50 to quickly enter the arc extinguishing chamber 60, and reducing the probability of the arc moving in the space outside the arc extinguishing chamber 60. In some embodiments, the end of the second moving contact 30 away from the rotating shaft 10 is at least partially not located in the first opening 610 or directly opposite the first opening 610. That is, the end of the first moving contact 30 away from the rotating shaft 10 may be partially not located in the first opening 610 or directly opposite the first opening 610, or may not be located at all.

[0102] Compared with the related art in which the ends of the first moving contact 20 and the second moving contact 30 away from the rotating shaft 10 are simultaneously located in the first opening 610 or directly opposite the first opening 610, the above-mentioned solution of the present application only needs to ensure that the end of the first moving contact 20 away from the rotating shaft 10 is located in the first opening 610 or directly opposite the first opening 610, thereby reducing the volume of the arc extinguishing chamber 60, reducing the materials used in the arc extinguishing chamber 60, and reducing the production cost. In addition, the end of the second moving contact 30 away from the rotating shaft 10 is not located in the first opening 610 or directly opposite the first opening 610, so that the arc extinguishing grid 650 does not need to extend from the outer periphery of the first moving contact 20 directly opposite to the outer periphery of the second moving contact 30, reducing the surface area of ​​the arc extinguishing grid 650 facing the arc, thereby reducing the resistance of the arc when entering the arc extinguishing chamber 60, which is conducive to the arc entering the arc extinguishing chamber 60 smoothly and reducing the probability of the arc moving in the space outside the arc extinguishing chamber 60.

[0103] Please refer to Figure 7 , Figure 7 An exploded view of an arc extinguishing chamber 60 provided in this application is shown in FIG. Figure 7 As shown, in some embodiments, the arc extinguishing chamber 60 also includes a first gas producing part 660 and a second gas producing part 670, and the first moving contact 20 has a first contact point for contacting the static contact 50. During the process of opening and closing the switch, the first contact point forms a first motion trajectory, and the first gas producing part 660 and the second gas producing part 670 are respectively located on both sides of the first motion trajectory.

[0104] The first gas generating member 660 and the second gas generating member 670 may be made of one or more gas generating materials such as nylon 66, polyoxymethylene or melamine.

[0105] The first gas producing member 660 and the second gas producing member 670 may both be block-shaped or plate-shaped structures, which is not limited in the embodiment of the present application.

[0106] The first motion trajectory is the initial arc drawing trajectory before the arc enters the arc extinguishing chamber 60. The first gas producing part 660 and the second gas producing part 670 are respectively arranged on both sides of the first motion trajectory, so that at the beginning of the arc generation, the high-temperature airflow at the position of the arc can affect the first gas producing part 660 and the second gas producing part 670, so that the first gas producing part 660 and the second gas producing part 670 are affected by the high temperature to release gas, and the air pressure between the first gas producing part 660 and the second gas producing part 670 rises. In other words, an air pressure difference will be generated between the side of the arc extinguishing chamber 60 close to the first moving contact 20 and the side away from the first moving contact 20. Affected by the air pressure, the gas in the arc extinguishing chamber 60 moves from the position close to the first moving contact 20 to the direction away from the first moving contact 20. At this time, the arc will move along the moving direction of the gas in the arc extinguishing chamber 60, gradually exchange heat with the arc extinguishing grid during the movement and cool down, and finally cool down and extinguish in the arc extinguishing chamber 60, or cool down and extinguish after being discharged from the outlet of the arc extinguishing chamber 60. Therefore, the provision of the first gas generating member 660 and the second gas generating member 670 can accelerate the arc extinguishing.

[0107] In the case where the arc extinguishing chamber further includes a first fixing member 630 and a second fixing member 640, in some embodiments, the first gas producing member 660 is located on a side of the first fixing member 630 close to the second fixing member, and the second gas producing member 670 is located on a side of the second fixing member 640 close to the first fixing member 630.

[0108] This arrangement allows the first gas producing member to be positioned away from the middle portion of the arc extinguishing grid 650 , thereby reducing obstruction of the arc by the first gas producing member 660 and the second gas producing member 670 , thereby facilitating the arc to smoothly enter the arc extinguishing chamber 60 and to smoothly move the arc within the arc extinguishing chamber 60 .

[0109] like Figure 7 As shown, in some embodiments, the first gas producing part 660 is provided with a first positioning column 661, which is limited in position with the outer shell of the switch; the second gas producing part 670 is provided with a second positioning column 671, which is limited in position with the outer shell of the switch.

[0110] The first positioning column 661 is a protruding structure disposed on the first gas generating member 660 , and may be cylindrical or prism-shaped, which is not limited in the embodiment of the present application.

[0111] The first positioning column 661 is limitedly matched with the outer shell of the switch, wherein the limit matching refers to a matching relationship with a limit function. For example, a limit hole may be provided on the inner wall of the outer shell of the switch, and the end of the first positioning column 661 passing through the first positioning hole 631 is located in the limit hole, thereby realizing the limit matching of the first positioning column 661 and the outer shell of the switch.

[0112] The structure of the second positioning column 671 and its matching relationship with the housing of the switch are the same as or similar to those of the first positioning column 661 , and will not be described in detail in the embodiment of the present application.

[0113] The above structure realizes the limiting cooperation between the first gas producing part 660 and the shell through the first positioning column 661, and realizes the limiting cooperation between the second gas producing part 670 and the shell through the second positioning column 671, thereby fixing the first gas producing part 660 and the second gas producing part 670 in the shell to make its structure stable.

[0114] like Figure 7 As shown, in the case where the arc extinguishing chamber 60 includes a first fixing member 630 and a second fixing member 640, in some embodiments, a first positioning column 661 is arranged on a side of the first gas producing member 660 close to the first fixing member 630, and the first fixing member 630 is provided with a first positioning hole 631 corresponding to the first positioning column 661, and the end of the first positioning column 661 passing through the first positioning hole 631 cooperates with the outer casing of the switch; the second positioning column 671 is arranged on a side of the second gas producing member 670 close to the second fixing member 640, and the first fixing member 630 is provided with a second positioning hole 641 corresponding to the second positioning column 671, and the end of the second positioning column 671 passing through the second positioning hole 641 cooperates with the outer casing of the switch.

[0115] In the above case, the length of the first positioning column 661 is at least greater than the thickness of the first fixing member 630 , so that the first positioning column 661 can still protrude from the surface of the first fixing member 630 after passing through the first positioning hole 631 .

[0116] The first positioning hole 631 is arranged at a position corresponding to the first positioning column 661, and the cross-sectional shape of the first positioning hole 631 is the same as the cross-sectional shape of the first positioning column 661. Therefore, when the first positioning column 661 passes through the first positioning hole 631, the first positioning column 661 and the surrounding wall of the first positioning hole 631 can basically fit together, thereby reducing the shaking of the first gas producing part 660 relative to the first fixing part 630.

[0117] In the above solution, the first positioning column 661 passes through the first positioning hole 631, realizing the positioning installation between the first gas generating sheet and the first fixing member 630, and the limiting cooperation between the first positioning column 661 and the outer shell of the switch realizes the relative fixation of the first gas generating sheet and the outer shell of the switch. Therefore, the setting of the first positioning column 661 makes the first gas generating sheet, the first fixing member 630 and the outer shell of the switch relatively fixed, realizing the fixed installation of the arc extinguishing chamber 60 in the outer shell of the switch.

[0118] The specific structure of the second positioning column 671 and the mounting structure between the second fixing member 640 and the switch housing are the same as those of the first positioning column 661 , and will not be described in detail in this embodiment of the application.

[0119] Please refer to Figure 8 and Fig. 9 , Figure 8 A schematic diagram of the internal structure of a switch in a closed state provided in one embodiment of the present application. Fig. 9 A schematic diagram of the internal structure of a switch in an open state provided in one embodiment of the present application.

[0120] like Figure 8 and Fig. 9 As shown, the first moving contact and the second moving contact on the rotating shaft in the present application can be provided in one or more groups, and correspondingly, the static contact can also be provided with one or more, and the arc extinguishing chamber can also be provided with one or more. The embodiment of the present application does not limit the number of the above components. Figure 8 and Fig. 9 Only two groups of first moving contacts and second moving contacts are provided, and two static contacts and two arc extinguishing chambers are provided for illustration.

[0121] In summary, the present application arranges the static contact 50, the first moving contact 20 and the second moving contact 30 of the switch so that, when closing the switch, the static contact 50 first contacts with the first moving contact 20 and then contacts with the second moving contact 30; when opening the switch, the static contact 50 first separates from the second moving contact 30 and then separates from the first moving contact 20, and the arc extinguishing chamber 60 is located on the periphery of the rotating area of ​​the accommodating chamber 40, so that the arc in the opening and closing process is only generated between the static contact 50 and the first moving contact 20, so that when the connected current is constant, the energy density of the arc in the present application is larger and it is easier to be introduced into the arc extinguishing chamber 60, which is conducive to achieving rapid arc extinguishing and reducing the arc ablation of the internal parts of the switch.

[0122] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0123] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A switch, characterized in that: include: A rotating shaft, a first moving contact, a second moving contact and a stationary contact; The rotating shaft is rotatably connected to the housing of the switch, the first moving contact and the second moving contact are both mounted on the rotating shaft, the rotating shaft is used to drive the first moving contact and the second moving contact to rotate, and an accommodating cavity is provided between the first moving contact and the second moving contact; The static contact is located on the rotation path of the accommodating cavity. When the switch is closed, the static contact enters the accommodating cavity as the rotating shaft rotates, and first contacts the first moving contact and then contacts the second moving contact during the entering process. When the switch is opened, the static contact moves out of the accommodating cavity as the rotating shaft rotates, and first separates from the second moving contact and then separates from the first moving contact during the moving out process.

2. The switch according to claim 1, characterized in that: The side wall of the static contact close to the accommodating cavity is inclined from the side close to the first moving contact to the side close to the second moving contact in a direction away from the accommodating cavity.

3. The switch according to claim 1, characterized in that: An angle is formed between the side wall of the first moving contact close to the stationary contact and the side wall of the second moving contact close to the stationary contact. The intersection of the angle is located on the side where the rotating shaft is located, and the first moving contact is closer to the stationary contact than the second moving contact.

4. The switch according to claim 1, characterized in that: The side wall of the first moving contact close to the stationary contact is coplanar with the side wall of the second moving contact close to the stationary contact. A contact portion is protruding from the side wall of the first moving contact close to the stationary contact. The contact portion is used to first contact and / or last separate from the stationary contact.

5. The switch according to claim 4, characterized in that: A side of the contact portion close to the rotating shaft and the first moving contact has a stepped surface transition, and a side of the contact portion away from the rotating shaft and the first moving contact has a smooth surface transition.

6. The switch according to any one of claims 1 to 5, characterized in that: Along the radial direction of the rotating shaft, the length of the first moving contact is greater than the length of the second moving contact.

7. The switch according to any one of claims 1 to 5, characterized in that: The switch further comprises an arc extinguishing chamber, which is located at a side of the rotation area of ​​the first moving contact away from the rotating shaft, and has a first opening, which faces the rotation area of ​​the first moving contact.

8. The switch according to claim 7, wherein an arc striking angle is provided on the static contact, the arc striking angle extends from the static contact to one side of the first opening, and a side wall of the arc striking angle close to the first opening is smoothly connected to a side wall of the static contact close to the accommodating cavity.

9. The switch according to claim 8, characterized in that The arc extinguishing chamber includes a plurality of arc extinguishing grids; There is a gap between the side wall of the arc striking angle close to the first opening and the first arc extinguishing grid, and the first arc extinguishing grid is the arc extinguishing grid closest to the arc striking angle.

10. The switch according to claim 7, characterized in that: Along the radial direction of the rotating shaft, the length of the first moving contact is greater than the length of the second moving contact. During the opening and closing process, the end of the first moving contact away from the rotating shaft is located in the first opening or directly opposite to the first opening.

11. The switch according to claim 7, characterized in that: During the opening and closing process, at least a portion of the end of the second moving contact away from the rotating shaft is not located in the first opening or directly opposite to the first opening.

12. The switch according to claim 7, characterized in that: The arc extinguishing chamber also includes a first gas producing part and a second gas producing part. The first moving contact has a first contact point for contacting the static contact. During the process of opening and closing the circuit, the first contact point forms a first motion trajectory. The first gas producing part and the second gas producing part are respectively located on both sides of the first motion trajectory.

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