Isolation switch and power supply system

Abstract

An isolating switch and a power supply system relate to the technical field of electrical switches, the isolating switch comprises a static contact and a moving contact assembly, the moving contact assembly is rotatably arranged relative to the moving contact, so that the moving contact assembly clamps the static contact or is separated from the static contact; the moving contact assembly comprises a first contact, a second contact and an elastic piece, the first contact comprises a first main body part and a first extension part, the second contact comprises a second main body part and a second extension part, the first main body part and the second main body part are fixedly connected, a gap is formed between the first extension part and the second extension part, and the first extension part and the second extension part are used for clamping the static contact; the elastic piece is at least partially located on the side, opposite to the second contact, of the first contact and used for providing elastic force towards the second extension part for the first extension part. The clamping pressure between the first contact and the second contact is larger, the bounce amplitude of the moving contact assembly when the moving contact assembly is in contact with the static contact is reduced, and the safety and stability of the arc extinguishing assembly in the using process are guaranteed.

Description

[0001] This application claims the priority of a Chinese patent application with the application number 202311545209.1, filed with the China National Intellectual Property Administration on November 17, 2023, and titled "Disconnector and Power Supply System", the entire content of which is incorporated herein by reference. Technical Field

[0002] This application relates to the technical field of electrical switches, and particularly to a disconnector and a power supply system. Background Art

[0003] The disconnector in the power system usually includes a moving contact and a static contact. By moving the moving contact, the contact and separation between the moving contact and the static contact are realized. When the moving contact contacts the static contact, the disconnector is turned on and the current flows; when the moving contact separates from the static contact, the disconnector is turned off and the current is cut off. At the moment when the moving contact and the static contact separate, an arc will be generated in the gap between the moving contact and the static contact. The arc is a discharge phenomenon with concentrated energy, high temperature and strong brightness. The ablation effect of the arc will seriously affect the quality and electrical life of the contacts.

[0004] When the moving contact moves to contact the static contact, the static contact is clamped by the moving contact. Under the action of the inertial force during the movement of the moving contact and the electro - repulsive force between the moving contact and the static contact, the moving contact will bounce back, reach the maximum distance and then close again. To be applicable to a power system with a large current, the moving contact is made of a material with a large current - carrying capacity. Materials with a strong current - carrying capacity usually have low elasticity themselves, resulting in a small clamping pressure of the moving contact on the static contact. If the clamping pressure of the moving contact on the static contact is small, the amplitude of the contact bounce is large, and the arc generated in the contact gap exists for a long time, which will reduce the service life of the moving contact and the static contact, and affect the safety and stability during the use of the disconnector. Summary of the Invention

[0005] This application provides a disconnector and a power supply system. By arranging an elastic member to act on the moving contact, the moving contact has a large and stable clamping pressure, reducing contact bounce, and thus ensuring the safety during the use of the disconnector.

[0006] In a first aspect, the present application provides a disconnector, which is used to be connected between a power supply and a power conversion unit to achieve electrical connection or disconnection between the power supply and the power conversion unit; the disconnector includes: a stationary contact and a moving contact assembly, the moving contact assembly is rotatably arranged relative to the stationary contact so that the moving contact assembly clamps the stationary contact or separates from the stationary contact; the moving contact assembly includes: a first contact, including a first main body portion and a first extension portion; a second contact, including a second main body portion and a second extension portion, the first main body portion and the second main body portion are fixedly connected, the first extension portion and the second extension portion are relatively spaced apart, and the spaced space therebetween is used to receive the stationary contact; an elastic member, at least partially located on a side of the first extension portion facing away from the second extension portion, for providing an elastic force towards the second extension portion to the first extension portion.

[0007] In the moving contact assembly of the disconnector provided by the present application, the first extension portion of the first contact and the second extension portion of the second contact are used to clamp the stationary contact. The moving contact assembly includes an elastic member, and the elastic member is located on a side of the first extension portion facing away from the second extension portion. The elastic member can deform to generate an elastic force, so that the first contact and the elastic member are combined to improve the ability of the first contact to elastically deform. Moreover, the elastic member is used to apply an elastic force to the first extension portion in a direction from the first extension portion towards the second extension portion, so that the elastic member acts on the first extension portion, improving the clamping pressure of the first extension portion and the second extension portion on the stationary contact, reducing contact bounce, and ensuring the safety during the use of the disconnector; at the same time, the first contact and the second contact are independently arranged, so that both the first contact and the second contact can independently deform, which is beneficial to improving the degree of deformation of the first contact and the second contact when clamping the stationary contact, and further improving the clamping pressure of the first extension portion and the second extension portion on the stationary contact.

[0008] In a possible implementation manner, the first main body portion and the second main body portion are in contact connection, the first extension portion extends bent away from the second extension portion from the first main body portion, and the first main body portion is recessed towards the second main body portion relative to the first extension portion. By making the first main body portion and the second main body portion in contact connection, the first extension portion is bent to form the spaced space between the first extension portion and the second extension portion, avoiding the need to use a gasket to space the first main body portion and the second main body portion and form the above-mentioned spaced space, which is beneficial to reducing the number of parts of the moving contact assembly, reducing the overall mass of the moving contact assembly. The moving contact assembly has a lighter mass, so that the moving contact assembly has a faster speed during movement, which is beneficial to achieving rapid arc extinction during the separation process of the moving contact assembly and the stationary contact, and ensuring the safety during the use of the disconnector.

[0009] In a possible implementation manner, the second extension portion bends and extends away from the first extension portion from the second main body portion, and the second main body portion is recessed towards the first main body portion relative to the second extension portion. By bending the second extension portion to form a spaced space between the first extension portion and the second extension portion, it is beneficial to reduce the number of parts of the moving contact assembly, reduce the overall mass of the moving contact assembly, and enable the moving contact assembly to move faster during the movement; at the same time, it is also beneficial for the second extension portion and the first extension portion to cooperate with each other to form the above-mentioned spaced space, and avoid the bending angle of the first extension portion relative to the first main body portion or the second extension portion relative to the second main body portion being too large, which affects the structural strength of the first contact or the second contact.

[0010] In a possible implementation manner, there is a gap between the elastic member and the first main body portion. By providing a gap between the elastic member and the first main body portion, the installation and disassembly of the elastic member are simplified, and a deformation space is provided for the deformation of the elastic member, which is convenient for adjusting the magnitude of the elastic force exerted by the elastic member on the first extension portion.

[0011] In a possible implementation manner, the surface of the first extension portion facing away from the second contact has a first limiting portion, and the elastic member has a second limiting portion. The first limiting portion and the second limiting portion are engaged and connected to limit the relative sliding of the elastic member relative to the first extension portion in a plane perpendicular to the first direction, and the first direction is the direction in which the first contact faces the second contact. By providing the first extension portion with the first limiting portion and the elastic member with the second limiting portion, and the first limiting portion and the second limiting portion being engaged and connected, it is possible to prevent the elastic member from sliding relatively in a plane perpendicular to the direction in which the first contact faces the second contact, improve the stability of the relative position between the elastic member and the first extension portion, and enable the elastic member to always provide an elastic force acting on the first extension portion.

[0012] In a possible implementation manner, the first limiting portion includes a groove provided on the surface of the first extension portion, and the second limiting portion is engaged in the groove and abuts against the side wall of the groove. By making the first limiting portion in the specific form of a groove, the setting of the first limiting portion is made simpler, the elastic member can be accommodated in the first limiting portion, reducing the overall length of the first extension portion and the elastic member in the direction in which the first contact faces the second contact, and reducing the occupied space of the first contact and the elastic member; at the same time, the inner wall of the groove can abut against the elastic member to realize the limiting of the elastic member when the elastic member deforms.

[0013] In a possible implementation, the number of the first extension parts is multiple, each of the multiple first extension parts has the first limiting part, the elastic part has multiple second limiting parts, and the second limiting parts are in one-to-one clamping connection with the first limiting parts. By making the first contact have multiple first extension parts, each first extension part has a first limiting part, and the number of the second limiting parts of the elastic part is equal to that of the first limiting parts, and the second limiting parts and the first limiting parts are in one-to-one clamping connection, the elastic part can provide elastic force for each first extension part and ensure the stability of the relative position between the elastic part and each first extension part.

[0014] In a possible implementation, the material of the first contact includes at least one of red copper, oxygen-free copper, gold and silver. By making the material of the first contact include at least one of red copper, oxygen-free copper, gold and silver, the first contact has good electrical conductivity, can achieve good current-carrying capacity, and will not generate excessive heat after passing through a relatively high current, which is beneficial to ensuring the safety of the first contact during use.

[0015] In a possible implementation, the moving contact assembly further includes a fitting. The elastic part has a first fitting hole, the first main body part has a second fitting hole, and the second main body has a third fitting hole. The fitting passes through and is fixedly connected to the first fitting hole, the second fitting hole and the third fitting hole. By making the elastic part have a first fitting hole, the first main body have a second fitting hole, and the second main body have a third fitting hole, the fitting passes through the first fitting hole, the second fitting hole and the third fitting hole in sequence, which is beneficial to realizing the insertion and fixation connection between the fitting and the elastic part, the first main body and the second main body, and improving the stability of the relative positions of multiple components in the moving contact assembly.

[0016] In a possible implementation, the fitting member has a third limiting portion and a fourth limiting portion. The third limiting portion abuts against the surface of the elastic member facing away from the second main body portion, and the fourth limiting portion abuts against the surface of the second main body portion facing away from the elastic member. The length of the third limiting portion in the second direction is greater than the length in the third direction. The length of the third limiting portion in the second direction is greater than the dimension of the first fitting hole in the second direction and less than or equal to the dimension of the first fitting hole in the third direction. The length of the third limiting portion in the third direction is less than or equal to the dimension of the first fitting hole in the second direction. The second direction and the third direction have an included angle and are both perpendicular to the direction from the first contact to the second contact. By making the fitting member have the third limiting portion and the fourth limiting portion, the fitting member clamps and fixes the elastic member, the first contact and the second contact. By making the length of the third limiting portion in the second direction less than or equal to the dimension of the first fitting hole in the third direction and the length of the third limiting portion in the third direction less than the dimension of the first fitting hole in the second direction, the fitting member realizes the fixation and separation from the elastic member, the first contact and the second contact by rotation, which is convenient for the installation and disassembly of the fitting member.

[0017] In a possible implementation, the fitting member includes a connecting portion between the third limiting portion and the fourth limiting portion. The connecting portion fixes the third limiting portion and the fourth limiting portion. The third limiting portion, the connecting portion and the fourth limiting portion are all plate-like structures. During preparation, only need to prepare the corresponding mold and stamp it once to prepare the Figure 14 structure of the fitting member 40 shown, without processes such as turning and milling. The preparation process is simple and the production cost is reduced.

[0018] In a possible implementation, the disconnecting switch has a housing. The first contact, the second contact and the elastic member are all installed in the housing. The housing has a mounting groove. The third limiting portion is located in the mounting groove. The length of the mounting groove in the third direction is greater than the length of the third limiting portion in the third direction and less than the length of the third limiting portion in the second direction. By making the size relationship between the limiting mounting groove and the third limiting portion, the inner wall of the mounting groove abuts against the third limiting portion, restricting the rotation of the third limiting portion in the mounting groove and avoiding the separation of the fitting member, the elastic member, the first contact and the second contact during rotation, which is beneficial to ensuring the structural stability of the moving contact assembly.

[0019] In a possible implementation, the fitting member includes a rivet, which is used to sequentially pass through the first fitting hole, the second fitting hole, and the third fitting hole and is used to fix the elastic member, the first main body portion, and the second main body. The rivet can fix the elastic member, the first main body portion, and the second main body portion more firmly, prevent the fitting member from detaching under some vibrating usage environments of the disconnecting switch, and improve the structural stability of the disconnecting switch.

[0020] In a possible implementation, the second contact includes a first clamping portion, and the elastic member includes a second clamping portion. The first clamping portion and the second clamping portion are clamped and connected so that the first contact is clamped between the elastic member and the second contact. By making the second contact include the first clamping portion, the elastic member include the second clamping portion, and the first clamping portion and the second clamping portion are clamped and connected, the elastic member, the first contact, and the second contact are connected and fixed through the structures of the elastic member and the second contact themselves, reducing the number of parts of the moving contact assembly, reducing the overall mass of the moving contact assembly. The moving contact assembly is lighter in mass, so that the moving contact assembly moves faster during the movement process, which is beneficial to realizing rapid arc extinguishing during the separation process of the moving contact assembly and the static contact, and ensuring the safety during the use of the disconnecting switch.

[0021] In a possible implementation, there are at least two first clamping portions, which are located on opposite sides of the second main body portion. The first clamping portions extend toward the elastic member side relative to the second main body portion. At least two first clamping portions are each provided with a clamping hole, and the clamping holes of at least two first clamping portions are arranged opposite to each other; there are at least two second clamping portions, which are located on opposite sides of the elastic member, and at least two second clamping portions are inserted into at least two first clamping holes one by one for clamping. By providing the clamping holes in the first clamping portion, the second clamping portion can utilize the deformation ability of the elastic member to achieve clamping connection with the first clamping portion, simplifying the connection method between the first clamping portion and the second clamping portion; at the same time, the one-to-one clamping of at least two first clamping portions and at least two second clamping portions is also beneficial to improving the stability of the clamping connection.

[0022] In a possible implementation, the elastic member includes a first elastic member and a second elastic member. The first elastic member is located on the side of the first contact facing away from the second contact, and the second elastic member is located on the side of the second contact facing away from the first contact. The second elastic member is used to provide an elastic force toward the first extension portion to the second extension portion. By making the arc extinguishing assembly further include a second elastic member, elastic members and second elastic members are respectively provided on the opposite sides of the first contact and the second contact, which is beneficial to further increasing the clamping pressure between the first contact and the second contact, and is beneficial to reducing the bouncing amplitude of the moving contact assembly when the moving contact assembly contacts the static contact, ensuring the safety and stability during the use of the arc extinguishing assembly.

[0023] In a second aspect, the present application further provides a power supply system, including a control unit, a power source, a power conversion unit, and the disconnecting switch according to any one of the embodiments of the first aspect above. The disconnecting switch is electrically connected between the power source and the power conversion unit. The control unit is configured to send an electrical signal to the disconnecting switch when the power source or the power conversion unit fails. The disconnecting switch is configured to control the contact or separation of the moving contact assembly and the static contact of the disconnecting switch according to the electrical signal. The beneficial effects corresponding to this embodiment are similar to those of the above embodiments, and will not be elaborated herein.

[0024] In a third aspect, the present application further provides a moving contact assembly, including: a first contact, including a first main body portion and a first extension portion; a second contact, including a second main body portion and a second extension portion. The first main body portion and the second main body portion are fixedly connected. There is a gap between the first extension portion and the second extension portion and they are configured to clamp the static contact; an elastic member, at least partially located on a side of the first extension portion facing away from the second extension portion, configured to provide an elastic force towards the second extension portion to the first extension portion. The beneficial effects corresponding to this embodiment are similar to those of the above embodiments, and will not be elaborated herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the separation of the moving contact assembly and the static contact in the disconnecting switch provided by the embodiment of the present application;

[0026] Figure 2 is a schematic structural diagram of the clamping of the moving contact assembly and the static contact in the disconnecting switch provided by the embodiment of the present application;

[0027] Figure 3 is a schematic structural diagram of the base and the moving contact assembly provided by the embodiment of the present application;

[0028] Figure 4 is an exploded view of the disconnecting switch provided by the embodiment of the present application;

[0029] Figure 5 is a schematic structural diagram of the setting of the cooperating member in the moving contact assembly provided by the embodiment of the present application;

[0030] Figure 6 is Figure 5 an exploded view of the moving contact assembly provided by the embodiment shown;

[0031] Figure 7 is Figure 5 a front view of the moving contact assembly provided by the embodiment shown;

[0032] Figure 8 is Figure 5Bottom view of the moving contact assembly provided by the illustrated embodiment;

[0033] Figure 9 Schematic structural diagram of the cover plate and the fitting provided by the embodiment of the present application;

[0034] Figure 10 Schematic structural diagram of the first abutting portion and the second abutting portion provided in the moving contact assembly of the embodiment of the present application;

[0035] Figure 11 is Figure 10 Exploded view of the moving contact assembly provided by the illustrated embodiment;

[0036] Figure 12 is Figure 10 Front view of the moving contact assembly provided by the illustrated embodiment;

[0037] Figure 13 Schematic system diagram of the power supply system provided by the embodiment of the present application;

[0038] Figure 14 Schematic diagram of a fitting provided by the embodiment of the present application;

[0039] Figure 15A Schematic diagram of the insertion and cooperation of a fitting, an elastic member, a first main body portion and a second main body portion provided by the embodiment of the present application;

[0040] Figure 15B Schematic diagram of the snap connection of a fitting, an elastic member, a first main body portion and a second main body portion provided by the embodiment of the present application;

[0041] Figure 16 Schematic diagram of a double elastic member provided by the embodiment of the present application;

[0042] Figure 17A Schematic diagram of the insertion and cooperation of a rivet with an elastic member, a first main body portion and a second main body portion provided by the embodiment of the present application;

[0043] Figure 17B Schematic diagram of the snap connection of a rivet with an elastic member, a first main body portion and a second main body portion provided by the embodiment of the present application;

[0044] Figure 18 Schematic diagram of multiple photovoltaic strings connected in parallel to the input end of a DC / DC conversion circuit;

[0045] Figure 19 Schematic diagram of a photovoltaic system with a switching device provided by the embodiment of the present application;

[0046] Figure 20Schematic diagram of the connection relationship between a switching device and a photovoltaic string provided by an embodiment of the present application;

[0047] Figure 21a Another schematic diagram of the connection relationship between a switching device and a photovoltaic string provided by an embodiment of the present application;

[0048] Figure 21b Another schematic diagram of the connection relationship between a switching device and a photovoltaic string provided by an embodiment of the present application;

[0049] Figure 21c Another schematic diagram of the connection relationship between a switching device and a photovoltaic string provided by an embodiment of the present application;

[0050] Figure 22 Schematic diagram of the structure of a switching device provided by an embodiment of the present application;

[0051] Figure 23 Exploded view of a switching device provided by an embodiment of the present application;

[0052] Figure 24 Schematic diagram of the structure of a first-layer switch provided by an embodiment of the present application;

[0053] Figure 25 Another schematic diagram of the structure of a switching device provided by an embodiment of the present application. Detailed implementation manners

[0054] The embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

[0055] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application will be explained and described below.

[0056] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0057] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0058] It should be understood that the term "and / or" used herein is merely a description of the same field of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0059] Depending on the context, the word "if" as used herein can be interpreted as "when", "while", "in response to determining", or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" can be interpreted as "when determined", "in response to determining", "when detecting (stated condition or event)", or "in response to detecting (stated condition or event)".

[0060] It should be understood that the "first", "second", etc. used in this application are only for the purpose of distinguishing descriptions, and should not be construed as indicating or implying relative importance, nor as indicating or implying an order.

[0061] In the description of this application, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this application.

[0062] For the range used in this application, unless otherwise specifically stated as not including the end values, it is default to include the two end values of the range. For example, within the range of 1 to 5, both the values 1 and 5 are included.

[0063] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "install", "connect", and "couple" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or a contact connection or an integral connection; for those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0064] It should be understood that in this application, "electrically connected" can be understood as physical contact and electrical conduction between components; it can also be understood as a form of connection between different components in a circuit structure through physical lines such as copper foils or wires of a printed circuit board (PCB) that can transmit electrical signals. "Connected" and "linked" can both refer to a mechanical connection relationship or a physical connection relationship. For example, A is connected to B or A is linked to B can mean that there are fastening components (such as screws, bolts, rivets, etc.) between A and B, or A and B are in contact with each other and it is difficult to separate A and B.

[0065] This application provides a disconnect switch 200, which is used to be connected between a power source and a power conversion unit to achieve electrical connection or disconnection between the power source and the power conversion unit. Please refer to Figure 1 and Figure 2 , Figure 1 which shows a schematic structural diagram of the separation of the moving contact assembly 100 and the static contact 202 in the disconnect switch 200 of this application, Figure 2 which shows a schematic structural diagram of the clamping of the moving contact assembly 100 and the static contact 202 in the disconnect switch 200 of this application. The disconnect switch 200 includes a static contact 202 and a moving contact assembly 100. The moving contact assembly 100 includes a first contact 10 and a second contact 20. There is a gap between the first contact 10 and the second contact 20, and this gap is used to accommodate the static contact 202 so that when the static contact 202 contacts the first contact 10 and the second contact 20, the first contact 10 and the second contact 20 clamp the static contact 202. The moving contact assembly 100 can be rotatably arranged relative to the static contact 202 so that the moving contact assembly 100 clamps the static contact 202 or separates from the static contact 202.

[0066] The disconnect switch 200 further includes a housing 201. The moving contact assembly 100 is accommodated in the housing 201 and fixed inside the housing 201, and the moving contact assembly 100 can rotate following the housing 201. The first contact 10 and the second contact 20 can move synchronously. When the housing 201 rotates to a certain position, the first contact 10 and the second contact 20 clamp the static contact 202 and are in contact with the static contact 202 at the same time to achieve circuit conduction; when the housing 201 rotates to another position, the first contact 10, the second contact 20 and the static contact 202 separate to achieve circuit disconnection.

[0067] Refer to Figure 3 and Figure 4 as shown, Figure 3 which shows a schematic structural diagram of the base and the moving contact assembly in this application, Figure 4The explosion diagram of the disconnecting switch in the present application is shown. The housing 201 may include a base 2011 and a cover plate 2012. The moving contact assembly 100 is partially disposed in the card slot 2013 of the base 2011, and the cover plate 2012 covers the notch of the card slot 2013 to fix the moving contact assembly 100 between the cover plate 2012 and the base 2011. When the moving contact assembly 100 is disposed in the card slot 2013 of the base 2011, the first contact 10 may be located on one side of the second contact 20 close to the bottom wall of the card slot 2013, or the first contact 10 may be located on one side of the second contact 20 away from the bottom wall of the card slot 2013. The base 2011 and the cover plate 2012 are snapped together to form an arc-shaped groove 2014 with an outer periphery opening. The arc-shaped groove 2014 is located on the outer periphery of the card slot 2013, and a part of the moving contact assembly 100 extends into the arc-shaped groove 2014. The static contact 202 can slide in the arc-shaped groove 2014 and slide to Figure 1 the position shown and be electrically connected to the moving contact assembly 100. The housing 201 can protect the moving contact assembly 100 and the static contact 202.

[0068] The first contact 10 includes a first main body portion 11 and a first extension portion 12, and the second contact 20 includes a second main body portion 21 and a second extension portion 22. The first main body portion 11 and the second main body portion 21 are fixedly connected so that the first contact 10 and the second contact 20 are relatively fixed, facilitating the synchronous movement of the first contact 10 and the second contact 20. The first extension portion 12 and the second extension portion 22 are relatively spaced apart, and the spaced space therebetween is used to accommodate the static contact 202. The number of static contacts 202 in the disconnecting switch 200 can be set according to actual needs. When the number of static contacts 202 is single, the first contact 10 may include a single first extension portion 12, the second contact 20 may include a single second extension portion 22, the single first extension portion 12 and the single second extension portion 22 are used to clamp the single static contact 202, and the first main body portion 11 and the second main body portion 21 are also electrically connected to the circuit to realize the conduction of the circuit when the static contact 202 contacts the first extension portion 12 and the second extension portion 22.

[0069] In one embodiment, refer to Figure 6As shown, the first contact 10 includes a first main body portion 11 and two first extension portions 12, and the second contact 20 includes a second main body portion 21 and two second extension portions 22. One of the two first extension portions 12 and one of the two second extension portions 22 are arranged relatively spaced apart, and the spaced space therebetween is for accommodating one of the two stationary contacts 202; the other of the two first extension portions 12 and the other of the two second extension portions 22 are arranged relatively spaced apart, and the spaced space therebetween is for accommodating the other of the two stationary contacts 202. When the housing rotates to a certain position, the spaced spaces between the two first extension portions 12 and the two second extension portions 22 respectively accommodate the two stationary contacts 202, and the two stationary contacts 202 contact the moving contact assembly simultaneously to achieve conduction of the circuit; when the housing rotates to another position, the two stationary contacts 202 are separated from both the two first extension portions 12 and the two second extension portions 22 to achieve disconnection of the circuit.

[0070] In one embodiment, please refer to Figure 6 and Figure 11 , the first contact 10 and the second contact 20 are stacked, and the direction from the first contact 10 to the second contact 20 is the stacking direction. The first extension portion 12 extends toward the side away from the first main body portion 11 in a direction perpendicular to the stacking direction, and the second extension portion 22 extends toward the side away from the second main body portion 21 in a direction perpendicular to the stacking direction, so that the first extension portion 12 protrudes from the edge of the first main body portion 11, and the second extension portion 22 protrudes from the edge of the second main body portion 21. The first main body portion 11 and the second main body portion 21 are attached, and the first extension portion 12 and the second extension portion 22 extend away from each other in the stacking direction, so that there is a spaced distance between the first extension portion 12 and the second extension portion 22 in the stacking direction, which is beneficial for the stationary contact 202 to be clamped by the first extension portion 12 and the second extension portion 22 after the moving contact assembly 100 moves; the first extension portion 12 and the second extension portion 22 are at least partially opposite in the stacking direction, so that at least part of the orthographic projection of the second extension portion 22 on the first extension portion 12 coincides with the first extension portion 12, which is beneficial for the stationary contact 202 to contact or separate from the first extension portion 12 and the second extension portion 22 simultaneously.

[0071] The first extension portion 12 can swing in the stacking direction relative to the first main body portion 11, and the second extension portion 22 can swing in the stacking direction relative to the second main body portion 21. When the moving contact assembly 100 does not contact the stationary contact 202, the clearance distance between the first extension portion 12 and the second extension portion 22 can be smaller than the thickness of the stationary contact 202, so that when the moving contact assembly 100 clamps the stationary contact 202, the first extension portion 12 and the second extension portion 22 can tightly clamp the stationary contact 202 to improve the stability of the electrical connection.

[0072] The shapes and sizes of the first main body portion 11 and the second main body portion 21 may be the same, and the orthographic projection of the second main body portion 21 on the first main body portion 11 may coincide with the first main body portion 11. The first main body portion 11 and the first extension portion 12 are of an integral structure, and the first extension portion 12 is connected to the edge area of the first main body portion 11; the second main body portion 21 and the second extension portion 22 are of an integral structure, and the second extension portion 22 is connected to the edge area of the second main body portion 21 to enhance the structural strength of the first contact 10 and the second contact 20.

[0073] Refer to Figure 5 As shown, the first main body portion 11 and the first extension portion 12 with both ends bent can be formed by one stamping, and the second main body portion 21 and the second extension portion 22 with both ends bent can be formed.

[0074] The movement form of the moving contact assembly 100 can be rotation or linear sliding, and the embodiments of the present application do not limit this. When the movement form of the moving contact assembly 100 is rotation, the moving contact assembly 100 rotates clockwise or counterclockwise around the rotation axis, and the contact and separation between the moving contact assembly 100 and the static contact 202 are realized during the rotation. The extending direction of the rotation axis is parallel to the stacking direction, the first contact 10 and the second contact 20 rotate synchronously around the same rotation axis, and the rotation axis is located in the central area of the first main body portion 11 and the second main body portion 21. When the moving contact assembly 100 rotates, the positions of the first main body portion 11 and the second main body portion 21 do not change, and the first extension portion 12 and the second extension portion 22 perform circular motion synchronously, and the positions of the first extension portion 12 and the second extension portion 22 change.

[0075] The moving contact assembly 100 further includes an elastic member 30. The elastic member 30 is located on the side of the first contact 10 facing away from the second contact 20. The elastic member 30 located on the side of the first contact 10 facing away from the second contact 20 is used to provide an elastic force towards the second extension portion 22 to the first extension portion 12, so that the first main body portion 11 and the second main body portion 21 have a tendency of moving away from each other, then the first extension portion 12 and the second extension portion 22 have a tendency of moving towards each other, which improves the clamping pressure of the first extension portion 12 and the second extension portion 22 on the static contact 202, and is beneficial to reducing the bouncing amplitude of the moving contact assembly 100 when the moving contact assembly 100 contacts the static contact 202, and ensuring the safety and stability during the use of the moving contact assembly 100.

[0076] The elastic member 30 moves synchronously with the moving contact assembly 100. During the movement of the moving contact assembly 100, the position and magnitude of the elastic force exerted by the elastic member 30 on the first extension portion 12 always remain unchanged, which is beneficial to improving the stability of the clamping pressure between the first contact 10 and the second contact 20.

[0077] In some possible embodiments, the elastic member 30 and the first contact 10 are stacked, so that the elastic member 30, the first contact 10 and the second contact 20 are stacked in sequence in the stacking direction. The elastic member 30 is detachably connected to at least one of the first contact 10 and the second contact 20, so as to realize the connection and fixation of the first elastic member 30 and the moving contact assembly 100.

[0078] In some possible embodiments, please refer to Figure 7 and Figure 12 , the first main body portion 11 and the second main body portion 21 are in contact connection, so that the first main body portion 11 and the second main body portion 21 are attached, and the first main body portion 11 and the second main body portion 21 can be completely attached. The first extension portion 12 extends and bends from the first main body portion 11 in a direction away from the second extension portion 22, so that the first main body portion 11 is recessed relative to the first extension portion 12 in a direction close to the second main body portion 21. The first extension portion 12 bends to form a spaced space between the first extension portion 12 and the second extension portion 22, avoiding the need to use a gasket to space the first main body portion 11 and the second main body portion 21 and form the above-mentioned spaced space, which is beneficial to reducing the number of parts of the moving contact assembly 100, reducing the overall mass of the moving contact assembly 100, the moving contact assembly 100 having a lighter mass, enabling the moving contact assembly 100 to move faster during the movement process, being beneficial to realizing rapid arc extinguishing during the separation process of the moving contact assembly 100 and the static contact 202, and ensuring the safety during the use of the disconnecting switch 200.

[0079] Similarly, the second extension portion 22 can extend and bend from the second main body portion 21 in a direction away from the first extension portion 12, the second main body portion 21 is recessed relative to the second extension portion 22 in a direction close to the first main body portion 11, and the second extension portion 22 bends to form a spaced space between the first extension portion 12 and the second extension portion 22, which is beneficial to reducing the number of parts of the moving contact assembly 100, reducing the overall mass of the moving contact assembly 100, and enabling the moving contact assembly 100 to move faster during the movement process.

[0080] The first extension portion 12 and the second extension portion 22 can extend away from each other, so that the first extension portion 12 and the second extension portion 22 are simultaneously bent to form a spaced space between the first extension portion 12 and the second extension portion 22, which is beneficial to avoiding the bending angle of the first extension portion 12 relative to the first main body portion 11 or the second extension portion 22 relative to the second main body portion 21 being too large and affecting the structural strength of the first contact 10 or the second contact 20.

[0081] In some possible embodiments, please refer to Figure 7 and Figure 12, there is a gap between the elastic member 30 and the first main body portion 11, and the elastic member 30 is in contact with the first extension portion 12. The elastic member 30 can extend along an arc, and the elastic member 30 bends away from the second main body portion 21 from the first main body portion 11, so that there is a gap between the elastic member 30 and the first main body portion 11; or the elastic member 30 can extend along a straight line, and the first extension portion 12 bends and extends away from the second extension portion 22 from the first main body portion 11, and the first main body portion 11 is recessed toward the second main body portion 21 relative to the first extension portion 12, and the elastic member 30 is in contact with the first extension portion 12, so that there is a gap between the elastic member 30 and the first main body portion 11.

[0082] By providing a gap between the elastic member 30 and the first main body portion 11, it is beneficial to simplify the installation and disassembly of the elastic member 30, and also provides a deformation space for the deformation of the elastic member 30, facilitating the adjustment of the magnitude of the elastic force exerted by the elastic member 30 on the first extension portion 12. For example, the magnitude of the elastic force exerted on the first extension portion 12 is adjusted by adjusting the gap between the elastic member 30 and the first main body portion 11 through a fitting member. When the gap between the elastic member 30 and the first main body portion 11 is reduced compared to the initial gap, the elastic force exerted by the elastic member 30 on the first extension portion 12 becomes larger; when the gap between the elastic member 30 and the first main body portion 11 is increased compared to the initial gap, the elastic force exerted by the elastic member 30 on the first extension portion 12 becomes smaller.

[0083] In some possible embodiments, please refer to Figure 5 and Figure 6 , the surface of the first extension portion 12 of the first contact 10 facing away from the second contact 20 has a first limiting portion 121, the elastic member 30 has a second limiting portion 31, and the first limiting portion 121 and the second limiting portion 31 are snap-connected to detachably connect the elastic member 30 to the first contact 10, which is beneficial to realize the connection and fixation of the elastic member 30 to the first contact 10; at the same time, the elastic member 30 is also limited by the first limiting portion 121, preventing the elastic member 30 from relatively sliding in a plane perpendicular to the first direction ( Figure 5 the Z direction in ), where the first direction is the direction in which the first contact faces the second contact, ensuring the stability of the relative position between the elastic member 30 and the first contact 10 and maintaining the stability of the clamping pressure between the first contact 10 and the second contact 20.

[0084] When the elastic member 30 and the first main body portion 11 are spaced apart in the stacking direction, the elastic member 30 only contacts the first extension portion 12, so that the elastic member 30 only acts on the first extension portion 12, avoiding the elastic force generated by the elastic member 30 being dispersed to the first main body portion 11 after the elastic member 30 contacts the first main body portion 11, which affects the magnitude of the clamping pressure between the first contact 10 and the second contact 20; at the same time, the spaced space between the elastic member 30 and the first main body portion 11 also provides a deformation space for the elastic member 30 to deform.

[0085] In one embodiment, the first limiting portion 121 includes a groove provided on the surface of the first extension portion 12, and the second limiting portion 31 includes a convex portion. The convex portion is engaged in the groove and abuts against the side wall of the groove, so that the second limiting portion 31 is received in the first limiting portion 121, and the second limiting portion 31 abuts against the bottom wall and the side wall of the first limiting portion 121. By making the first limiting portion 121 include a groove provided on the surface of the first extension portion 12 and the second limiting portion 31 include a convex portion, the preparation of the first limiting portion 121 and the second limiting portion 31 is simpler, the stability of the engagement connection between the second limiting portion 31 and the first limiting portion 121 is improved, the first limiting portion 121 limits the relative position of the elastic member 30 and the first contact 10, preventing the elastic member 30 from relatively sliding in a plane perpendicular to the first direction relative to the first contact 10, which is beneficial to improving the stability of the connection between the elastic member 30 and the first contact 10; at the same time, the inner wall of the groove can abut against the elastic member, which is also beneficial to achieving limitation when the elastic member 30 deforms. The second limiting portion 31 can be completely received in the first limiting portion 121, which is beneficial to improving the compactness of the structure of the moving contact assembly 100, avoiding the second limiting portion 31 protruding from the first limiting portion 121 in the stacking direction, avoiding the elastic member 30 protruding from the first contact 10, and avoiding interference between the elastic member 30 and other structures.

[0086] In some possible implementation manners, the number of the first extension portions 12 is multiple, and the multiple first extension portions 12 are spaced apart; correspondingly, the second contact 20 has multiple second extension portions 22, and the multiple first extension portions 12 and the multiple second extension portions 22 are opposite to each other in the stacking direction, and at least two first extension portions 12 and at least two second extension portions 22 are used for contacting and separating from the static contact 202.

[0087] Each of the multiple first extension portions 12 has a first limiting portion 121. Correspondingly, the elastic member 30 has multiple second limiting portions 31, and the second limiting portions 31 are engaged with the first limiting portions 121 in a one-to-one correspondence, increasing the contact area between the elastic member 30 and the first contact 10 and improving the stability of the connection between the elastic member 30 and the first contact 10; at the same time, the elastic member 30 can provide elastic force for each first extension portion 12, ensuring the stability of the clamping pressure between the first extension portion 12 and the second extension portion 22 and realizing the limitation of the elastic member 30.

[0088] In one embodiment, the first contact 10 has two first extension portions 12, and the two first extension portions 12 are symmetrically arranged about the center of the first main body portion 11. In a direction perpendicular to the stacking direction, the two first extension portions 12 extend away from the first main body portion 11; correspondingly, the second contact 20 has two second extension portions 22, and the two second extension portions 22 are symmetrically arranged about the center of the second main body portion 21. The two second extension portions 22 are respectively opposite to the two first extension portions 12 in the stacking direction, and the opposite first extension portion 12 and second extension portion 22 are used to contact and separate from the static contact 202 simultaneously. The surfaces of the two first extension portions 12 facing away from the second contact 20 both have first limiting portions 121, and the elastic member 30 has two second limiting portions 31, and the two second limiting portions 31 are respectively engaged with the two first limiting portions 121, so that the two first extension portions 12 can both receive the elastic force of the elastic member 30 from the first contact 10 towards the second contact 20, and the clamping pressure between the first contact 10 and the second contact 20 is increased.

[0089] The moving contact assembly 100 provided by the present application includes an elastic member 30. The elastic member 30 is located on the side of the first contact 10 facing away from the second contact 20. The elastic member 30 is used to apply an elastic force to the first extension portion 12 in the direction from the first extension portion 12 towards the second extension portion 22, so that the elastic member 30 acts on the first extension portion 12, increases the clamping pressure of the first extension portion 12 and the second extension portion 22 on the static contact 202, reduces contact bounce, and ensures the safety during the use of the disconnecting switch 200; at the same time, the first contact 10 and the second contact 20 are independently arranged, so that the first contact 10 and the second contact 20 can both deform independently, which is beneficial to improving the degree of deformation of the first contact 10 and the second contact 20 when clamping the static contact 202, and further increasing the clamping pressure of the first extension portion 12 and the second extension portion 22 on the static contact 202.

[0090] In some possible implementation manners, please refer to Figure 3 , the first extension portion 12 of the first contact 10 has a first guide groove 122, the second extension portion 22 of the second contact 20 has a second guide groove 221, the opening direction of the first guide groove 122 is from the first contact 10 towards the second contact 20, and the opening direction of the second guide groove 221 is from the second contact 20 towards the first contact 10, so that the openings of the first guide groove 122 and the second guide groove 221 are arranged opposite to each other.

[0091] The first guide groove 122 and the second guide groove 221 are respectively located on one side in the moving direction of the first extension portion 12 and the second extension portion 22. After the moving contact assembly 100 moves, the stationary contact 202 enters the first guide groove 122 and the second guide groove 221 from the openings of the first guide groove 122 and the second guide groove 221, so that the stationary contact 202 is simultaneously accommodated in the first guide groove 122 and the second guide groove 221. The stationary contact 202 is clamped between the first extension portion 12 and the second extension portion 22, and the stationary contact 202 is simultaneously in contact with the inner walls of the first guide groove 122 and the second guide groove 221, so that the first contact 10 and the second contact 20 are simultaneously in contact with the stationary contact 202. The arrangement of the first guide groove 122 and the second guide groove 221 not only ensures the simultaneous contact between the stationary contact 202 and the first contact 10 and the second contact 20, but also helps to guide the stationary contact 202 and reduce the impact force during the contact between the stationary contact 202 and the first contact 10 and the second contact 20, thereby reducing the bounce amplitude of the moving contact assembly 100 when the moving contact assembly 100 is in contact with the stationary contact 202, and ensuring the safety and stability of the moving contact assembly 100 during use.

[0092] Exemplarily, the movement form of the moving contact assembly 100 is rotation. The first guide groove 122 is located at one side edge of the first extension portion 12 in the rotation direction. The opening direction of the first guide groove 122 not only faces the second extension portion 22 from the first extension portion 12, but also faces the stationary contact 202 in the rotation direction, so that the stationary contact 202 can enter the first guide groove 122 from the opening of the first guide groove 122; the bottom wall of the first guide groove 122 is smoothly connected to the side wall on the side away from the stationary contact 202, so that the bottom wall of the first guide groove 122 and the side wall away from the stationary contact 202 guide the stationary contact 202 and reduce the impact force during the contact between the stationary contact 202 and the moving contact assembly 100. Similarly, the second guide groove 221 is located at one side edge of the second extension portion 22 in the rotation direction. The first guide groove 122 and the second guide groove 221 are arranged oppositely. The opening direction of the second guide groove 221 not only faces the first extension portion 12 from the second extension portion 22, but also faces the stationary contact 202 in the rotation direction, and the bottom wall of the second guide groove 221 is smoothly connected to the side wall on the side away from the stationary contact 202.

[0093] In some possible implementation manners, please refer to Figure 5 and Figure 6, the moving contact assembly 100 further includes a fitting 40. The elastic member 30 has a first fitting hole 33, the first main body portion 11 has a second fitting hole 111, and the second main body portion 21 has a third fitting hole 211. The first fitting hole 33, the second fitting hole 111, and the third fitting hole 211 are through holes that communicate with each other. The fitting 40 sequentially passes through the first fitting hole 33, the second fitting hole 111, and the third fitting hole 211, and is inserted and fixed with the elastic member 30, the first main body portion 11, and the second main body portion 21, so that the fitting 40 is fixedly connected to the elastic member 30, the first main body portion 11, and the second main body portion 21, improving the stability of the relative positions of the elastic member 30, the first main body portion 11, and the second main body portion 21.

[0094] The fitting 40 has a third limiting portion 41 and a fourth limiting portion 42. The third limiting portion 41 and the fourth limiting portion 42 can be respectively located at opposite ends of the fitting 40. The third limiting portion 41 is located on the side of the elastic member 30 facing away from the first contact 10, and the third limiting portion 41 abuts against the surface of the elastic member 30 facing away from the second main body portion 21; the fourth limiting portion 42 is located on the side of the second contact 20 facing away from the first contact 10, and the fourth limiting portion 42 abuts against the surface of the second main body portion 21 facing away from the elastic member 30. It can be understood that the fourth limiting portion 42 can also abut against the surface of the elastic member 30 facing away from the second main body portion 21, and the third limiting portion 41 can also abut against the surface of the second main body portion 21 facing away from the elastic member 30.

[0095] By making the third limiting portion 41 abut against the surface of the elastic member 30 facing away from the second main body portion 21, and the fourth limiting portion 42 abut against the surface of the second main body portion 21 facing away from the elastic member 30, the fitting 40 exerts a pressing force on the elastic member 30 from the elastic member 30 towards the second contact 20, and the fitting 40 exerts a pressing force on the second contact 20 from the second contact 20 towards the elastic member 30. The elastic member 30 and the second contact 20 are clamped towards each other under the action of the pressing force. The fitting 40 clamps and fixes the elastic member 30, the first contact 10, and the second contact 20, eliminating the need for a riveting structure, which is beneficial to simplifying the structure of the moving contact assembly 100, reducing the overall mass of the moving contact assembly 100, increasing the separation speed between the moving contact assembly 100 and the static contact 202, and achieving rapid arc extinguishing. At the same time, the direction of the pressing force received by the elastic member 30 is the same as the direction of the elastic force exerted by the elastic member 30 on the first contact 10, which is beneficial to ensuring the clamping pressure between the first contact 10 and the second contact 20, and reducing the bouncing amplitude of the moving contact assembly 100 when the moving contact assembly 100 contacts the static contact 202.

[0096] Please refer to Figure 7 and Figure 8 , the second direction ( Figure 8 the Y direction in Figure 7 and Figure 8 the X direction inFigure 7 in the Z direction), that is, both the second direction and the third direction are perpendicular to the direction in which the first contact faces the second contact, and there is an included angle between the second direction and the third direction, and the second direction can be perpendicular to the third direction. The length of the third limiting portion 41 in the second direction is greater than the length of the third limiting portion 41 in the third direction. The length of the third limiting portion 41 in the second direction is greater than the size of the first fitting hole 33 in the second direction, and the length of the third limiting portion 41 in the second direction is less than or equal to the size of the first fitting hole 33 in the third direction. The length of the third limiting portion 41 in the third direction is less than or equal to the size of the first fitting hole 33 in the second direction, so that the third limiting portion 41 can pass through the first fitting hole 33, and after the fitting member 40 rotates a certain angle, the third limiting portion 41 can abut against the surface of the elastic member 30 facing away from the second main body portion 21.

[0097] When the fitting member 40 rotates, the third limiting portion 41 and the fourth limiting portion 42 rotate synchronously. The size relationship between the fourth limiting portion 42 and the third fitting hole 211 is similar to the size relationship between the third limiting portion 41 and the first fitting hole 33, so as to realize the fixation and separation of the fitting member 40 from the elastic member 30, the first contact 10 and the second contact 20 by rotation, which is convenient for the installation and disassembly of the fitting member 40.

[0098] In one embodiment, the third limiting portion 41 is a cuboid, the first fitting hole 33 is a rectangular hole, the length of the third limiting portion 41 is less than or equal to the size of the length edge of the first fitting hole 33, and the width of the third limiting portion 41 is less than or equal to the size of the width edge of the first fitting hole 33, so that the third limiting portion 41 can pass through the first fitting hole 33; the length of the third limiting portion 41 is greater than the size of the width edge of the first fitting hole 33, so that after the third limiting portion 41 rotates a certain angle, both ends in the length direction of the third limiting portion 41 abut against the length edges on both sides of the first fitting hole 33 respectively, realizing the limitation of the third limiting portion 41.

[0099] In some possible implementation manners, please refer to Figure 9 , the first contact 10, the second contact 20 and the elastic member 30 are all installed in the housing 201. There is an installation groove 2015 on the cover plate 2012 of the housing 201. The third limiting portion 41 is located in the installation groove 2015. The length of the installation groove 2015 in the third direction ( Figure 9 in the X direction) is greater than the length of the third limiting portion 41 in the third direction, and the length of the installation groove 2015 in the third direction is less than the length of the third limiting portion 41 in the second direction ( Figure 9The length in the Y direction, so that the inner wall of the installation groove 2015 limits the third limiting portion 41, restricting the rotation of the third limiting portion 41 within the installation groove 2015, preventing the mating member 40, the first contact 10, the second contact 20, and the elastic member 30 from separating after being installed in the housing 201, which is beneficial to improving the stability of the moving contact assembly 100.

[0100] In some possible implementation manners, please refer to Figure 14 , Figure 15A and Figure 15B as shown in Figure 14 is a schematic diagram of a mating member provided by an implementation manner of the present application; Figure 15A is a schematic diagram of the plug-in fit of a mating member, an elastic member, a first main body portion, and a second main body portion provided by an implementation manner of the present application; Figure 15B is a schematic diagram of the snap connection of a mating member, an elastic member, a first main body portion, and a second main body portion provided by an implementation manner of the present application. The mating member 40 includes a third limiting portion 41, a fourth limiting portion 42, and a connecting portion 43. The connecting portion 43 is located between the third limiting portion 41 and the fourth limiting portion 42. The connecting portion 43 fixes the third limiting portion 41 and the fourth limiting portion 42 into an integral structure. For example, the third limiting portion 41, the fourth limiting portion 42, and the connecting portion 43 are integrally formed by compression molding.

[0101] The third limiting portion 41, the fourth limiting portion 42, and the connecting portion 43 are all plate-like structures. During preparation, only the corresponding mold needs to be prepared and stamped once to prepare the Figure 14 structure of the mating member 40 shown in the figure, without the need for processes such as turning and milling. The preparation process is simple, reducing the production cost.

[0102] Refer to Figure 15A and Figure 15B as shown in the figure, the elastic member 30 has a first mating hole 33, the first main body portion 11 has a second mating hole 111, the second main body portion 21 has a third mating hole 211. The first mating hole 33, the second mating hole 111, and the third mating hole 211 are all rectangular through holes. The third limiting portion 41 and the fourth limiting portion 42 are both square columnar structures. The lengths of the first mating hole 33, the second mating hole 111, and the third mating hole 211 are all greater than the length of the third limiting portion 41, and the widths of the first mating hole 33, the second mating hole 111, and the third mating hole 211 are all greater than the width of the third limiting portion 41 to ensure that the third limiting portion 41 can pass through the first mating hole 33, the second mating hole 111, and the third mating hole 211 in sequence. The lengths of the first mating hole 33, the second mating hole 111, and the third mating hole 211 and the length of the fourth limiting portion 42 may not be specifically limited, and the widths of the first mating hole 33, the second mating hole 111, and the third mating hole 211 and the width of the fourth limiting portion 42 may not be specifically limited.

[0103] The width of the first mating hole 33 is smaller than the length of the third limiting portion 41, and the width of the third mating hole 211 is smaller than the length of the fourth limiting portion 42. Refer to Figure 15A and Figure 15B As shown, the fitting 40 can sequentially pass through the third mating hole 211, the second mating hole 111, and the first mating hole 33 from one side of the second main body portion 11. By rotating 90 degrees, the third limiting portion 41 is clamped with the elastic member 30, and the fourth limiting portion 42 is clamped with the second main body portion 21 to fix the elastic member 30, the first main body portion 11, and the second main body portion 21.

[0104] In one embodiment, the length of the fourth limiting portion 42 is greater than the length of the third mating hole 211, and the length of the fourth limiting portion 42 is greater than the length of the third limiting portion 41. During the insertion process of the fitting 40, the fitting 40 will not pass through the second main body portion 21. When the fourth limiting portion 42 and the third mating hole 211 are inserted and abutted, rotation can improve the assembly efficiency and assembly accuracy.

[0105] In one embodiment, refer to Figure 16 as shown Figure 16 is a schematic diagram of a double elastic member provided by an embodiment of the present application. The elastic members 30 can be two and are respectively located on the upper and lower sides of the first main body portion 11 and the second main body portion 21. Correspondingly, the fourth limiting portion 42 and Figure 16 the first mating hole 33 of the lower elastic member 30 in

[0106] Figure 16 The width of the upper first mating hole 33 in Figure 16 is smaller than the length of the third limiting portion 41, and Figure 16 the width of the lower first mating hole 33 in Figure 16The first mating hole 33 in the upper middle is rotated 90 degrees again, the third limiting portion 41 and the upper elastic member 30 are snapped together, and the fourth limiting portion 42 and the lower elastic member 30 are snapped together to fix the two elastic members 30, the first main body portion 11 and the second main body portion 21.

[0107] In some possible embodiments, refer to Figure 17A and Figure 17B as shown in Figure 17A is a schematic diagram of the insertion and cooperation of a rivet with an elastic member, a first main body portion, and a second main body portion provided by an embodiment of the present application; Figure 17B is a schematic diagram of the snap connection of a rivet with an elastic member, a first main body portion, and a second main body portion provided by an embodiment of the present application. The fitting member 40 can be a rivet. The elastic member 30 has a first mating hole 33, the first main body portion 11 has a second mating hole 111, and the second main body portion 21 has a third mating hole 211. The first mating hole 33, the second mating hole 111, and the third mating hole 211 are all circular shapes that cooperate with the rivet. First, the rivet is sequentially passed through the first mating hole 33, the second mating hole 111, and the third mating hole 211. One end of the rivet has a nail cap 44, and the nail cap 44 constitutes the third limiting portion 41 of the fitting member 40. The outer diameter of the nail cap 44 is greater than the inner diameter of the first mating hole 33. The other end of the rivet is deformed by a tool such as a riveting member to form the fourth limiting portion 42 of the fitting member 40, and the deformed size is greater than the size of the third mating hole 211. The elastic member 30, the first main body portion 11, and the second main body portion 21 are connected into an integral structure by the rivet, and the rivet can more firmly fix the elastic member 30, the first main body portion 11, and the second main body portion 21, preventing the separation of the fitting member in some vibrating use environments and improving the structural stability of the disconnecting switch.

[0108] In some embodiments, the fitting member 40 can also cooperate with a structure having two elastic members 30, and both ends of the rivet are respectively snapped with the two elastic members 30 on both sides to fix the first main body portion 11 and the second main body portion 21 between the two elastic members 30.

[0109] In some possible embodiments, the elastic member 30 includes a first elastic member and a second elastic member. The first elastic member is located on the side of the first contact 10 facing away from the second contact 20, and the second elastic member is located on the side of the second contact 20 facing away from the first contact 10. The second elastic member is used to provide an elastic force towards the first extension portion 12 to the second extension portion 22. The setting method of the second elastic member is similar to that of the first elastic member. The second elastic member and the first elastic member respectively act on the first extension portion 12 and the second extension portion 22 to jointly increase the clamping pressure of the first contact 10 and the second contact 20 on the static contact 202 and reduce the bouncing amplitude of the moving contact assembly 100 when the moving contact assembly 100 contacts the static contact 202.

[0110] In some possible embodiments, the material of the first contact 10 includes at least one of red copper, oxygen-free copper, gold, and silver, and the material of the second contact 20 includes at least one of red copper, oxygen-free copper, gold, and silver. The materials of the first contact 10 and the second contact 20 may be the same or different. By making the materials of the first contact 10 and the second contact 20 have good electrical conductivity, the first contact 10 and the second contact 20 can achieve good current-carrying capacity and will not generate excessive heat after passing a relatively high current, which is beneficial to ensuring the safety of the first contact 10 and the second contact 20 during use.

[0111] In some possible embodiments, refer to Figure 10 and Figure 11 , the second contact 20 further has a first clamping portion 23. The first clamping portion 23 is connected to the second main body portion 21. The first clamping portion 23 and the second main body portion 21 may be an integral structure or independent components connected to each other. The present application does not limit this.

[0112] The first clamping portion 23 and the second extension portion 22 have a spacing distance to prevent the first clamping portion 23 from interfering with the stationary contact 202 during movement, thereby affecting the contact and separation between the second contact 20 and the stationary contact 202. In one embodiment, the first clamping portion 23 and the second extension portion 22 may have a spacing distance in a direction perpendicular to the direction from the first contact 10 to the second contact 20. The elastic member 30 has a second clamping portion 32. The first clamping portion 23 and the second clamping portion 32 are clamped and connected to achieve the detachable connection between the elastic member 30 and the second contact 20, and the first contact 10 is clamped between the elastic member 30 and the second contact 20.

[0113] The first clamping portion 23 has a first surface 231, and the second clamping portion 32 has a second surface 321. The first surface 231 and the second surface 321 are in contact. The first surface 231 is located on the side of the second surface 321 in the direction from the second main body portion 21 towards the first main body portion 11, so that the first clamping portion 23 receives a pressing force in the direction from the second main body portion 21 towards the first main body portion 11 at the first surface 231, and the second clamping portion 32 receives a pressing force in the direction from the first main body portion 11 towards the second main body portion 21 at the second surface 321. The elastic member 30 and the second contact 20 respectively receive pressing forces towards each other, so that the elastic member 30 and the second contact 20 are clamped towards each other under the action of the pressing force, realizing the stacked arrangement and assembly of the elastic member 30, the first contact 10 and the second contact 20. From the structural settings of the elastic member 30, the first contact 10 and the second contact 20 themselves, a relatively stable and reliable assembly relationship is achieved, eliminating the need for a riveting structure, which is beneficial to simplifying the structural setting of the moving contact assembly 100, reducing the overall mass of the moving contact assembly 100, increasing the separation speed of the moving contact assembly 100 and the static contact 202, and realizing rapid arc extinguishing. At the same time, the direction of the pressing force received by the elastic member 30 is the same as the direction of the elastic force exerted by the elastic member 30 on the first contact 10, which is beneficial to ensuring the clamping pressure between the first contact 10 and the second contact 20 and reducing the bouncing amplitude of the moving contact assembly 100 when the moving contact assembly 100 contacts the static contact 202.

[0114] Exemplarily, please refer to Figure 10 and Figure 11 , the second contact 20 includes two second extension portions 22 and two first clamping portions 23. The two second extension portions 22 are respectively located on the opposite sides of the second main body portion 21 in the third direction ( Figure 10 the X direction in Figure 10 ), and the two first clamping portions 23 are respectively located on the opposite sides of the second main body portion 21 in the second direction ( Figure 10 the Y direction in

[0115] Please refer to Figure 10 and Figure 11, the first clamping portion 23 has an abutting hole 232. The first clamping portion 23 extends from the second main body portion 21 in the stacking direction. The inner wall of the abutting hole 232 facing the second main body portion 21 is the first surface 231. There is a spacing distance between the first surface 231 and the second main body portion 21 in the stacking direction, so that the first surface 231 is located on the side of the elastic member 30 facing away from the first contact 10; the second clamping portion 32 is an abutting post. The surface of the second clamping portion 32 facing away from the second main body portion 21 is the second surface 321. The first surface 231 is in contact with the second surface 321, and the first surface 231 is located on the side of the second surface 321 away from the second main body portion 21.

[0116] When assembling the moving contact assembly 100, first stack the first contact 10 and the second contact 20 so that the first main body portion 11 and the second main body portion 21 are in contact, the first extension portion 12 and the second extension portion 22 are opposite, and the first main body portion 11 is located between the two first clamping portions 23; then stack the elastic member 30 on the side of the first contact 10 facing away from the second contact 20, so that the second clamping portion 32 of the elastic member 30 passes through the first clamping portion 23 of the second contact 20 to achieve the abutment of the second clamping portion 32 and the first clamping portion 23. At the same time, the second limiting portion 31 of the elastic member 30 is received in the first limiting portion 121 to achieve the detachable connection between the second limiting portion 31 and the first limiting portion 121, thereby realizing the stacking and assembly of the elastic member 30, the first contact 10 and the second contact 20. The detachable connection between the first limiting portion 121 and the second limiting portion 31 realizes the connection between the elastic member 30 and the first contact 10. The abutment of the first clamping portion 23 and the second clamping portion 32 realizes the connection between the elastic member 30 and the second contact 20, and at the same time realizes the clamping of the elastic member 30 and the second contact 20 on the first contact 10, avoiding the need to use a riveting structure to assemble the moving contact assembly 100, simplifying the structure of the moving contact assembly 100, and realizing a relatively reliable assembly relationship from the structural settings of the elastic member 30, the first contact 10 and the second contact 20 themselves.

[0117] As can be seen from the above, the moving contact assembly 100 can achieve relatively stable stacked arrangement and assembly of the elastic member 30, the first contact 10, and the second contact 20 by providing the first clamping portion 23 of the second contact 20 and the second clamping portion 32 of the elastic member 30. The elastic member 30 and the second contact 20 are respectively subjected to opposite abutting forces, so that the elastic member 30 and the second contact 20 are clamped towards each other under the action of the abutting force. The moving contact assembly 100 can also achieve the stacked arrangement and assembly of the elastic member 30, the first contact 10, and the second contact 20 by providing the fitting member 40, so that the fitting member 40 abuts against both the surface of the elastic member 30 facing away from the second main body portion 21 and the surface of the second main body portion 21 facing away from the elastic member 30. The above two methods both eliminate the setting of the riveting structure, simplify the setting structure of the moving contact assembly 100, reduce the overall mass of the moving contact assembly 100, and increase the separation speed between the moving contact assembly 100 and the static contact 202, and can achieve rapid arc extinguishing under relatively large current and voltage. The moving contact assembly 100 can either be provided with one of the above methods alone or can have both of the above methods at the same time, so that the first clamping portion 23 and the second clamping portion 32 and the fitting member 40 jointly improve the structural stability of the moving contact assembly 100 and increase the clamping pressure of the first contact 10 and the second contact 20 on the static contact 202.

[0118] The present application also provides a moving contact assembly 100. Please refer to Figure 5 and Figure 10 , the moving contact assembly 100 includes a first contact 10, a second contact 20, and an elastic member 30. The first contact 10 includes a first main body portion 11 and a first extension portion 12. The second contact 20 includes a second main body portion 21 and a second extension portion 22. The first main body portion 11 and the second main body portion 21 are fixedly connected. There is a gap between the first extension portion 12 and the second extension portion 22 and is used for clamping the static contact 202. The elastic member 30 is at least partially located on the side of the first extension portion 12 facing away from the second extension portion 22, and the elastic member 30 is used to provide an elastic force towards the second extension portion 22 to the first extension portion 12.

[0119] It can be understood that the moving contact assembly 100 in this embodiment is similar to the disconnecting switch 200 in the above embodiment. Therefore, the moving contact assembly 100 in this embodiment has similar technical effects to the disconnecting switch 200 in the above embodiment. Since the technical effects of the disconnecting switch 200 have been fully described in the above embodiment, they will not be elaborated here.

[0120] The present application also provides a power supply system 300. Please refer to Figure 13, including a control unit 301, a power supply 302, a power conversion unit 303, and the above-mentioned disconnector 200. The disconnector 200 is electrically connected between the power supply 302 and the power conversion unit 303. The control unit 301 is configured to send an electrical signal to the disconnector 200 when a fault occurs in the power supply 302 or the power conversion unit 303. The disconnector 200 is configured to control the contact or separation between the moving contact assembly 100 and the static contact 202 of the disconnector 200 according to the electrical signal, so as to realize the electrical connection or disconnection between the power supply and the power conversion unit.

[0121] The power supply 302 may be a photovoltaic module, or a photovoltaic string, or a series-parallel circuit of photovoltaic modules and photovoltaic strings. The power supply 302 may also be a kind of power conversion unit. The power conversion unit 303 may be a DC / DC converter, and / or a DC / AC converter. Both the power supply 302 and the power conversion unit 303 can be regarded as a power supply circuit. When a fault occurs in the power supply circuit, for example, if a fault occurs in the power supply 302 or the power conversion unit 303, the control unit 301 detects the occurrence of this fault, and the control unit 301 is capable of sending a trip signal to the disconnector 200. This trip signal is used to trigger (i.e., drive) the disconnector 200 to trip and disconnect the circuit.

[0122] The control unit 301 may be a separate controller. This controller is independently arranged in the power supply system 300 separate from the DC power source and the power conversion unit 303, and is electrically connected to the power conversion unit 303, the power supply 302, and the disconnector 200 through signal lines. In one implementation, the power conversion unit 303 may be an independent power conversion device, for example, an inverter. In one implementation, the control unit 301 may also be integrated in other functional devices. For example, the control unit 301 may be integrated in the inverter and may be a control circuit or a control chip on the main board of the inverter. In this way, the power conversion device, as an independent device, can automatically trip when used in any scenario. In one implementation, the disconnector 200 may be integrated in the power conversion device.

[0123] It can be understood that the power supply system 300 in this embodiment has the disconnector 200 in the above-mentioned embodiment. Therefore, the power supply system 300 in this embodiment has all the technical effects of the disconnector 200 in the above-mentioned embodiment. Since the technical effects of the disconnector 200 have been fully described in the above-mentioned embodiment, they will not be elaborated here.

[0124] Next, a specific application scenario of the disconnector of the present application will be introduced.

[0125] See Figure 18 , which is a schematic diagram of a plurality of photovoltaic strings connected in parallel to the input end of a DC / DC conversion circuit (i.e., the DC / DC converter mentioned above).

[0126] Continuing to take four photovoltaic strings as an example for introduction, Figure 18 in the figure, the photovoltaic strings are equivalent to the form of a single battery. Conventionally, the positive electrodes PV1+ - PV4+ of the four photovoltaic strings are connected together to connect to the positive input terminal of the DC / DC conversion circuit 2000, and the negative electrodes PV1- - PV4- of the four photovoltaic strings are connected together to connect to the negative input terminal of the DC / DC conversion circuit 2000. For example, when PV4 is reversely connected, that is, the positive and negative electrodes are reversed, it can be seen that the positive electrodes of PV1 - PV3 are connected to the positive input terminal of the DC / DC conversion circuit 2000, while the positive electrode of PV4 is connected to the negative input terminal of the DC / DC conversion circuit 2000. Figure 18 The figure shows the case where one photovoltaic string PV4 is reversely connected. Figure 18 As can be seen from the figure, the currents of PV1 - PV3 are shown by dotted lines with arrows, and the current of PV4 is shown by a solid line with an arrow, that is, the currents of PV1 - PV3 will flow back into PV4, and PV4 will be damaged due to excessive current. On the other hand, Figure 18 in the figure, fuses are added to each photovoltaic string, that is, the four photovoltaic strings are respectively connected in series with fuses F1 - F4. The fuses will increase the loss of the circuit. On the other hand, the disconnection of the fuses requires twice the input current, and the reliability is relatively low and the cost is relatively high.

[0127] To solve the problems caused by the reverse connection of the above photovoltaic strings, the embodiment of the present application provides a power conversion device 1000, which is applied to the above photovoltaic system and can specifically be an inverter. Refer to Figure 19 , this figure is a schematic diagram of a photovoltaic system with a switching device provided by the embodiment of the present application. Specifically, the power conversion device 1000 of the embodiment of the present application includes a switching device 400, a power conversion unit 303 (for example, a DC / DC conversion circuit 2000 and a DC / AC conversion circuit 3000), and a control unit 301. N photovoltaic strings (for example, PV1 - PV4) are connected to the input terminal of the power conversion unit 303 through the switching device 400. When a fault occurs in the photovoltaic string, the control unit 301 can control the switching device 400 to disconnect from the input terminal of the power conversion unit 303 to achieve fault isolation. Among them, the switching device 400 includes a rotating shaft and multiple layers of switches stacked along the extension direction of the rotating shaft. The multiple layers of switches in the embodiment of the present application can achieve simultaneous linkage actions (disconnection or closing) through the rotation of the rotating shaft. As long as one or more of the photovoltaic strings connected to the multiple layers of switches have reverse connection faults, all the switches of the multiple layers of switches will be driven by the rotating shaft to disconnect simultaneously.

[0128] Specifically, the multi-layer switch in the embodiment of the present application includes a first-layer switch and at least two second-layer switches, and the number of the first-layer switches is less than the number of the second-layer switches. The first-layer switch is used to connect to the first poles of N photovoltaic strings at the same time, and each second-layer switch is used to connect to the second poles of some photovoltaic strings in the N photovoltaic strings. Among them, the first pole is a positive pole or a negative pole, and the second pole is another pole opposite to the first pole. For example, if the first pole is a positive pole, then the second pole is a negative pole; if the first pole is a negative pole, then the second pole is a positive pole. The control unit 301 is used to: when there is a reverse connection fault in the N photovoltaic strings, or when there is a short circuit fault in the N photovoltaic strings, or when a short circuit fault occurs at the output end of the power conversion circuit, the multi-layer switches in the control switch device 400 are all disconnected in a coordinated manner to disconnect the positive and negative poles of the N photovoltaic strings from the power conversion circuit, and connect at most two or three photovoltaic strings in the N photovoltaic strings in parallel.

[0129] Equivalently, N photovoltaic strings can be grouped according to the specifications or circuit design of the photovoltaic strings, wherein the second poles of at least two groups of photovoltaic strings can be connected to the corresponding second-layer switches, that is, each second-layer switch can be connected to the second poles of a part of the N photovoltaic strings. In the above implementation scheme, the first-layer switches and the second-layer switches with different current carrying capacities are set in the multi-layer switch, so that the layer switches with different current carrying capacities can adapt to the access of different numbers of photovoltaic strings, thereby making the grouping and connection of photovoltaic strings more flexible to adapt to more scenarios and product requirements.

[0130] It should be noted that the embodiment of the present application does not limit the second poles of all the N photovoltaic strings to be connected to the second-layer switches of the same switching device. For example, other groups in the N photovoltaic strings can also be controlled to be turned off by other switching devices. However, no matter what connection relationship is adopted, when the multi-layer switches of the switching device are controlled to be disconnected, at most two or three photovoltaic strings in the N photovoltaic strings are connected in parallel. This can not only ensure the safety of the photovoltaic strings, but also flexibly group the photovoltaic strings. The following text will first take the case where the second poles of all the N photovoltaic strings are connected to the second-layer switches of the same switching device as an example. That is, the N photovoltaic strings are divided into M groups of photovoltaic strings, and the second-layer switches also include M, and the M second-layer switches are connected one-to-one with the second poles of the M groups of photovoltaic strings.

[0131] Specifically, the N photovoltaic strings are divided into at least two groups of photovoltaic strings, wherein the first poles of the N photovoltaic strings are connected to the first layer switches, and the second poles of each group of photovoltaic strings are connected to the second layer switches. It can be understood that in this connection mode, the first layer switches are connected to all the N photovoltaic strings, and each second layer switch is connected to part of the N photovoltaic strings.

[0132] When grouping N photovoltaic strings, N photovoltaic strings with the same quantity can have different grouping methods, but it is necessary to meet the magnitude of the reverse injection current that the photovoltaic strings can withstand. For example, if the specification of the photovoltaic string can only withstand the current reverse injected by one photovoltaic string, then each group can include at most two parallel-connected photovoltaic strings, or only one photovoltaic string. Another example is that if the specification of the photovoltaic string can withstand the current reverse injected by two photovoltaic strings, then each group can include at most two or three parallel-connected photovoltaic strings, or only one photovoltaic string.

[0133] For example, when N is 5, the N photovoltaic strings can be divided into two groups, one group includes 2 parallel-connected photovoltaic strings, and the other group includes 3 parallel-connected photovoltaic strings; or the N photovoltaic strings can be divided into three groups, the first group includes 1 photovoltaic string, and the second and third groups both include 2 parallel-connected photovoltaic strings. Of course, each group can also only include one photovoltaic string, then the N photovoltaic strings are divided into 5 groups.

[0134] It can be understood that in the embodiments of the present application, the number of groups is consistent with the number of second-layer switches. The fewer the number of groups, the fewer the number of second-layer switches in the switching device, and thus the cost and volume will also be reduced. Therefore, when ensuring safety, fewer groups can be set to save the number of layer switches. The following embodiments mainly take two in parallel as a group for exemplary illustration, but it should be understood that the embodiments of the present application are not limited thereto, and the grouping method can be more flexible according to the scenario and product requirements.

[0135] In order to better protect the photovoltaic string from bearing too much current when it is reversely connected, every two photovoltaic strings can be divided into a group, and the second pole of each group of photovoltaic strings corresponds to one of the second-layer switches in the multi-layer switch one by one.

[0136] The following takes N photovoltaic strings, with every two photovoltaic strings divided into a group as an example for introduction.

[0137] The N photovoltaic strings share a common positive electrode, and the positive electrodes of the N photovoltaic strings are connected to the input end of the power conversion circuit through one of the first-layer switches in the multi-layer switch; the N photovoltaic strings are grouped in pairs, and the negative electrodes of each group of photovoltaic strings are connected to the input end of the power conversion circuit through one of the second-layer switches in the multi-layer switch; or, the N photovoltaic strings share a common negative electrode, the negative electrodes of the N photovoltaic strings are connected to the input end of the power conversion circuit through one of the first-layer switches in the multi-layer switch, and the N photovoltaic strings are grouped in pairs, and the positive electrodes of each group of photovoltaic strings are connected to the input end of the power conversion circuit through one of the second-layer switches in the multi-layer switch.

[0138] N photovoltaic strings can be divided into M groups. When N is an even number, M = N / 2; when N is an odd number, M = (N + 1) / 2. In M - 1 groups of photovoltaic strings, each group of photovoltaic strings includes two photovoltaic strings connected in parallel, and the remaining group of photovoltaic strings includes one photovoltaic string. The switching device includes M + 1 layers of switches (one first - layer switch and M second - layer switches), and the M + 1 layers of switches are interlocked, that is, they are closed or opened simultaneously. The first poles of N photovoltaic strings are all connected to the input end of the DC / DC conversion circuit through one first - layer switch; the second poles of N photovoltaic strings are respectively connected to the input end of the DC / DC conversion circuit through M layers of switches.

[0139] The connection method in the above - mentioned embodiment can not only ensure that when the photovoltaic string has a reverse connection or short - circuit fault, after the switching device is disconnected, the photovoltaic string will not be affected by excessive reverse - flowing current, thus ensuring the safety of the photovoltaic string, but also save the number of layer switches, thereby reducing the volume and cost.

[0140] For ease of understanding, further refer to Figure 20 , Figure 20 which is a schematic diagram of the connection relationship between a switching device 400 and photovoltaic strings in an embodiment of the present application. In the embodiment shown in Figure 20 , taking N as 4 as an example, that is, N photovoltaic strings include PV1 - PV4. Among them, S1 is the schematic of the first - layer switch, and S2 and S3 are the schematics of two second - layer switches respectively.

[0141] It can be understood that in the Figure 20 embodiment, the first pole is the positive pole of the photovoltaic module, and the second pole is the negative pole of the photovoltaic module. The first - layer switch S1 simultaneously connects the positive poles (first poles) of 4 photovoltaic strings, and the two second - layer switches S2 and S3 respectively connect the negative poles (second poles) of two of the 4 photovoltaic strings. As shown in Figure 20 , when one of the 4 photovoltaic strings (for example, PV4) has a reverse connection or short - circuit fault, the control unit 301 will control the multi - layer switches S1, S2, and S3 in the switching device 400 to be interlocked and disconnected, so as to disconnect the connection between the positive and negative poles of the 4 photovoltaic strings and the power conversion unit 303, and avoid the spread of the fault to other circuits. Continuing with the example of the reverse connection of the photovoltaic string PV4, since PV1 - and PV2 - are not connected to PV4 - together, when PV4 has a reverse connection, only the current of PV3 flows back into PV4. Therefore, the current flowing back into PV4 is small. Since PV4 can withstand the reverse - flowing current of one string, it will not be damaged. This is different from Figure 18 , and such a connection method can not only ensure the safety of the photovoltaic string but also greatly save the number of layer switches.

[0142] It should be noted that in the embodiments of the present application, the first electrode is not limited to being the positive electrode or the negative electrode, that is, the N photovoltaic strings can be connected with a common positive electrode or a common negative electrode. For the convenience of description, in the following embodiments, the case where the N photovoltaic strings are connected with a common positive electrode is taken as an example for introduction. When the N photovoltaic strings are connected with a common positive electrode, the positive electrodes of the N photovoltaic strings are connected together and connected to the positive input terminal of the power conversion unit 303 through the first-layer switch. The negative electrodes of the N photovoltaic strings are respectively connected to the negative input terminal of the power conversion unit 303 through the corresponding second-layer switches.

[0143] It should be understood that the reverse connection fault of the photovoltaic strings in all embodiments of the present application means that at least one photovoltaic string has a reverse connection, that is, as long as one photovoltaic string has a reverse connection, the connection between the N photovoltaic strings and the power conversion unit 303 needs to be disconnected.

[0144] It can be seen that in the embodiments of the present application, the first-layer switch needs to connect the positive or negative electrodes of all N photovoltaic strings, while the second-layer switch only connects the positive or negative electrodes of a part of the N photovoltaic strings. Therefore, the first-layer switch requires a greater current-carrying capacity than the second-layer switch. Therefore, in the embodiments of the present application, the current-carrying capacity of the first-layer switch is greater than that of the second-layer switch.

[0145] In the previous implementation methods, the current-carrying capacity of each layer of switches in the multi-layer switch is the same. Therefore, under the requirement of continuously increasing the number of currently connected photovoltaic strings, the first-layer switch cannot connect more photovoltaic modules. For example, when the current-carrying capacity of each layer of switches can only reach a maximum of connecting less than N photovoltaic modules, it is impossible to realize connecting the positive electrodes of all N photovoltaic strings with only 1 first-layer switch, and more first-layer switches are required, which will increase the number of layer switches or limit the number of connected photovoltaic strings.

[0146] Therefore, in the embodiments of the present application, by increasing the current-carrying capacity of the first-layer switch so that the current-carrying capacity of the first-layer switch is greater than that of the second-layer switch, it is possible to ensure the safety of the photovoltaic strings while enabling only one first-layer switch to connect a certain pole of all N photovoltaic strings, further saving the number of layer switches.

[0147] Figure 20 The connection relationship with N = 4 is exemplified, and further refer to Figure 21a and Figure 21b , Figure 21a which is a schematic diagram of the connection relationship between another switch device and the photovoltaic strings provided by the embodiments of the present application, Figure 21b which is a schematic diagram of the connection relationship between another switch device and the photovoltaic strings provided by the embodiments of the present application. It can be seen that Figure 21a and Figure 21bSchematic diagrams of the connection relationships of a photovoltaic system when N = 6 and N = 5 respectively. Among them, the positive poles of N photovoltaic strings are all connected to the first-layer switch S1 simultaneously. In Figure 21a In the embodiment of Figure 21a , the N photovoltaic strings are divided into three groups of photovoltaic strings, each group includes two parallel-connected photovoltaic strings, and the negative poles of each group of photovoltaic strings correspond to the second-layer switches S2 to S4. That is to say, in Figure 21b In the embodiment shown, the current-carrying capacity of the first-layer switch S1 needs to reach the current input of 6 or more photovoltaic strings, and the current-carrying capacity of the second-layer switches S2 to S4 needs to reach the current input of 2 or more photovoltaic strings. Similarly, in Figure 21b In the embodiment shown, the N photovoltaic strings are divided into three groups of photovoltaic strings, two groups include two parallel-connected photovoltaic strings, and one group includes one photovoltaic string, and the negative poles of each group of photovoltaic strings correspond to the second-layer switches S2 to S4. That is to say, in

[0148] In the embodiments of the present application, the first poles of N photovoltaic strings can also be connected to the power conversion circuit through multiple first-layer switches. For example, when the number of N strings is increasing, connecting the first poles through only one first-layer switch for current collection may exceed the current-carrying capacity of one first-layer switch. At this time, multiple first-layer switches can also be used for connection. Refer to Figure 21c , Figure 21c which is a schematic diagram of the connection relationship between another switch device and photovoltaic strings provided by the embodiments of the present application. In Figure 21c In the embodiment shown, the first poles of N photovoltaic strings can be respectively connected to the DC / DC conversion circuit through two first-layer switches S1 and S2.

[0149] It should be understood that the above several embodiments are only examples, and the embodiments of the present application are not limited to the above number of photovoltaic strings. In practical applications, it can also support the access of more photovoltaic strings. Of course, the embodiments of the present application can also support the access of fewer photovoltaic strings.

[0150] Next, the structural design of a switch device 400 with multi-layer switches having different current-carrying capacities adapted to the above embodiments will be further introduced.

[0151] Refer to Figure 22 and Figure 23 , Figure 22 which is a schematic diagram of the structure of a switch device 400 provided by the embodiments of the present application, Figure 23An exploded view of a switch device 400 provided by an embodiment of the present application. The switch device 400 includes a rotating shaft 101 and multiple layers of switches P1 to Pn stacked along the extension direction O of the rotating shaft 101. Among them, P1 is the first-layer switch in the above-mentioned embodiment of the present application, and P2, P3, and P4 are the second-layer switches in the above-mentioned embodiment of the present application, respectively.

[0152] Among them, in the embodiment of the present application, the first-layer switch P1 is the above-mentioned disconnector 200 to adapt to the access of a larger current and further ensure the safety and stability of the switch device. Since the second-layer switch mainly considers the conventional current-carrying capacity, its internal structure can adopt some existing structures, and of course, the structure design of the above-mentioned disconnector 200 can also be adopted. Details will not be described hereinafter.

[0153] Combined with Figure 21a the shown embodiment, the positive poles of 6 photovoltaic strings can all be connected to P1, and the negative poles of 6 photovoltaic strings can be grouped in pairs and connected to P2, P3, and P4 respectively. In the embodiment of the present application, the current-carrying capacity of P1 is greater than that of P2, P3, and P4. Therefore, along the extension direction O of the rotating shaft 101, the layer height h1 of the first-layer switch P1 is greater than the layer heights h2 / h3 / h4 of the second-layer switches P2 / P3 / P4. In some possible embodiments, the layer height h1 of the first-layer switch P1 can also be equal to the layer heights h2 / h3 / h4 of the second-layer switches P2 / P3 / P4. Further, in addition to Figure 22 the shown embodiment, in some other possible implementation manners, the current-carrying capacity of P1 is greater than that of P2, P3, and P4. Therefore, along the first direction, the radial length of the first-layer switch P1 can be greater than or equal to the radial lengths of the second-layer switches P2 / P3 / P4, where the first direction is perpendicular to the extension direction O of the rotating shaft 101.

[0154] It can be understood that the switch device 400 in the embodiment of the present application may further include more layers of switches P5 to Pn in addition to the above-mentioned P1 to P4. These layer switches can all be designed according to a structure similar to that of P1 to P4 to enable a switch device 400 to connect more photovoltaic strings or / and multiple DC / DC conversion circuits 2000. In the following, the first-layer switch or the second-layer switch of a certain layer will be mainly used as an example for description, and the structures of the remaining layer switches will not be described in detail.

[0155] In order to ensure that the switch in the switching device 400 can be reliably disconnected when a reverse connection fault occurs in the photovoltaic string, the switching device 400 provided by the embodiment of the present application may further include a tripping device 102. The tripping device 102 may include a transmission mechanism controlled by the control unit 301. When a reverse connection fault or a short-circuit fault exists in the photovoltaic string, or a short-circuit fault occurs at the output end of the power conversion circuit, the control unit 301 may send a disconnection instruction to the tripping device 102. The tripping device 102 acts according to the disconnection instruction and drives the multi-layer switches P1 to Pn to be disconnected.

[0156] In addition to the above tripping device 102, the switching device 400 of the embodiment of the present application may further include a knob 103. The knob 103 is fixed to the rotating shaft 101. In this way, by manually rotating the knob 103, the multi-layer switches P1 to Pn can also be driven to be disconnected. That is, the switching device 400 of the embodiment of the present application can be automatically disconnected under the control of the control unit 301, or can be manually disconnected under manual control.

[0157] The following will be combined with Figure 23 The structure of each layer of the switch will be described. Each layer of the switch includes a housing and a moving contact assembly and a static contact located inside the housing. The moving contact assembly rotates relative to the housing. Specifically, the rotating shaft 101 is used to drive the moving contact assembly to rotate to separate or contact the static contact. When the multi-layer switches P1 to Pn are connected, the moving contact assemblies and the static contacts in the multi-layer switches P1 to Pn are all in contact to achieve electrical connection. When the multi-layer switches P1 to Pn are disconnected, the moving contact assemblies and the static contacts in the multi-layer switches P1 to Pn are all separated to disconnect the electrical connection.

[0158] Figure 24 It is a schematic structural diagram of a first-layer switch P1 provided by an embodiment of the present application. As Figure 24 shown in the embodiment, the first-layer switch P1 includes a housing 01, a first static contact 202A, a second static contact 202B, and a moving contact assembly 100. The first static contact 202A, the second static contact 202B, and the moving contact assembly 100 are arranged on the housing 01. The moving contact assembly 100 can rotate relative to the housing. The first static contact 202A and the second static contact 202B are fixed relative to the housing 01. The moving contact assembly 100 includes two ends 14A and 14B. The first static contact 202A and the second static contact 202B can be distributed on the rotation trajectory of the moving contact assembly 100. When the moving contact assembly 100 is driven to rotate by the rotating shaft 101, one end 14A of the moving contact assembly 100 can contact or separate from the first static contact 202A, and the other end 14B of the moving contact assembly 100 can contact or separate from the second static contact 202B. For example, currently Figure 23As shown, one end 14A of the moving contact assembly 100 can be in contact with the first static contact 202A, and the other end 14B of the moving contact assembly 100 can be in contact with the second static contact 202B. Among them, the first static contact 202A is used for electrically connecting with the photovoltaic string, and the second static contact 202B is used for electrically connecting with the power conversion circuit. Specifically, in combination with the above embodiments, the first static contact 202A of the first-layer switch P1 is used for connecting to the first pole (such as the positive pole) of N photovoltaic strings, and the second static contact 202B of the first-layer switch P1 is used for connecting to the input end of the DC / DC conversion circuit 2000.

[0159] In some possible implementation manners, the first static contact 202A may include a connecting portion 2010 protruding from the housing 01, and the connecting portion 2010 is used for electrically connecting with the photovoltaic string. Specifically, it can be as Figure 24 shown, and the fastening and electrical connection are realized through the connection hole 1210 on the connecting portion 2010 and the connector connecting the photovoltaic string.

[0160] In some possible implementation manners, when the switching device 400 is connected to the power conversion circuit, it can be connected by a cable or directly plugged into a circuit board with a power conversion circuit to achieve on-board connection. In the case of on-board connection, the second static contact 202B may include a pin portion 131 protruding from the housing 01, and the pin portion 131 is used for electrically connecting with the circuit board to achieve connection with the power conversion circuit. In Figure 11 the embodiment of, the pin portion 131 of the first-layer switch P1 includes two, namely 131A and 131B. It can be understood that in some possible implementation manners, 1 wider pin portion 131 can also be set to adapt to the first-layer switch P1 with such a high current-carrying capacity.

[0161] Furthermore, the first-layer switch P1 may further include a first arc extinguishing chamber 15 and a second arc extinguishing chamber 16. The first arc extinguishing chamber 15 and the second arc extinguishing chamber 16 are arranged on both sides of the moving contact assembly 100 along the rotation trajectories at both ends of the moving contact assembly 100, so as to extinguish the arcs between the moving contact assembly 100 and the first static contact 202A and the second static contact 202B when the moving contact assembly 100 is in contact with or separated from the first static contact 202A and the second static contact 202B respectively, and ensure the safety of the switching device 400.

[0162] Based on the specific structure of the first-layer switch P1 in the above scenario, reference can be made to the description in the embodiments of this application Figures 1 - 17B For example, Figure 1 as shown, the structure of the disconnecting switch mainly focuses on the static contact and the moving contact assembly part in the above first-layer switch P1, and structures such as the housing 01, the first arc extinguishing chamber 15 and the second arc extinguishing chamber 16 are removed.

[0163] In some other embodiments, the multiple first-layer switches and the multiple second-layer switches can also be arranged in a respective centralized manner.

[0164] Reference Figure 25 , Figure 25 is a schematic structural diagram of another switch device 400 provided by an embodiment of the present application. It can be understood that Figure 25 the embodiment shown is generally similar in principle and structure to the switch device 400 of the above Figure 22 shown embodiment. The main difference is that, in the Figure 25 shown embodiment, the multiple first-layer switches are stacked along the rotation axis and adjacent to each other, and the multiple second-layer switches are stacked along the rotation axis and adjacent to each other. As Figure 25 shown, the switch device 400 includes a rotation axis 101' and multiple layers of switches P1' to Pn' stacked along the extension direction O' of the rotation axis 101'. Among them, P1' to P3' are the first-layer switches in the above embodiments of the present application respectively, and P5' to Pn' are the second-layer switches in the above embodiments of the present application respectively. It can be seen that the multiple first-layer switches are stacked in sequence first, and then the multiple second-layer switches are stacked in sequence. In this embodiment, by arranging the multiple first-layer switches and the multiple second-layer switches in a respective centralized manner, the short-circuit risk caused by the positive and negative poles being too close can be better avoided.

[0165] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An isolating switch, characterized in that: The isolating switch is used to be connected between the photovoltaic string and the power conversion unit to realize the electrical connection or disconnection between the photovoltaic string and the power conversion unit; the isolating switch comprises: a static contact and a moving contact assembly, the moving contact assembly is rotatably arranged relative to the static contact, so that the moving contact assembly clamps the static contact or is separated from the static contact; The moving contact assembly comprises: A first contact including a first main body portion and a first extension portion; A second contact, comprising a second main body and a second extension, wherein the first main body and the second main body are fixedly connected, the first extension and the second extension are relatively spaced apart, and the space between the two is used to accommodate the stationary contact; The elastic member is at least partially located on a side of the first extension portion facing away from the second extension portion, and is used to provide an elastic force to the first extension portion toward the second extension portion.

2. The isolating switch according to claim 1, characterized in that: The first main body portion is in contact with the second main body portion, the first extension portion is bent and extended from the first main body portion in a direction away from the second extension portion, and the first main body portion is recessed relative to the first extension portion in a direction close to the second main body portion.

3. The isolating switch according to claim 2, characterized in that: The second extension portion bends and extends from the second main body portion toward a direction away from the first extension portion, and the second main body portion is recessed relative to the second extension portion toward a direction approaching the first main body portion.

4. The isolating switch according to any one of claims 1 to 3, characterized in that: A gap is defined between the elastic member and the first main body portion.

5. The isolating switch according to any one of claims 1 to 4, characterized in that: The surface of the first extension portion facing away from the second contact has a first limiting portion, and the elastic member has a second limiting portion. The first limiting portion and the second limiting portion are snap-fitted and connected to limit the relative sliding of the elastic member relative to the first extension portion in a plane perpendicular to a first direction, and the first direction is the direction of the first contact toward the second contact.

6. The isolation switch according to claim 5, characterized in that: The first limiting portion includes a groove arranged on the surface of the first extending portion, and the second limiting portion is engaged in the groove and abuts against a side wall of the groove.

7. The isolating switch according to claim 5 or 6, characterized in that: There are multiple first extension parts, each of which has the first limiting part. The elastic member has multiple second limiting parts, and the second limiting parts are connected with the first limiting parts in a one-to-one corresponding snap-fit ​​connection.

8. The isolating switch according to any one of claims 1 to 7, characterized in that: The material of the first contact includes at least one of copper, oxygen-free copper, gold and silver.

9. The isolating switch according to any one of claims 1 to 8, characterized in that: The moving contact assembly also includes a mating piece, the elastic piece has a first mating hole, the first main body has a second mating hole, the second main body has a third mating hole, and the mating piece passes through and fixedly connects the first mating hole, the second mating hole and the third mating hole.

10. The isolating switch according to claim 9, characterized in that: The matching member has a third limiting portion and a fourth limiting portion, the third limiting portion abuts against a surface of the elastic member facing away from the second main body portion, and the fourth limiting portion abuts against a surface of the second main body portion facing away from the elastic member; The length of the third limiting portion in the second direction is greater than that in the third direction, the length of the third limiting portion in the second direction is greater than the size of the first matching hole in the second direction and is less than or equal to the size of the first matching hole in the third direction, the length of the third limiting portion in the third direction is less than or equal to the size of the first matching hole in the second direction, the second direction and the third direction have an angle and are both perpendicular to the direction from the first contact to the second contact.

11. The isolating switch according to claim 10, characterized in that: The matching component includes a connecting portion between the third limiting portion and the fourth limiting portion, the connecting portion fixes the third limiting portion and the fourth limiting portion, and the third limiting portion, the connecting portion and the fourth limiting portion are all plate-shaped structures.

12. The isolating switch according to claim 10 or 11, characterized in that: The isolating switch has a shell, the first contact, the second contact and the elastic member are all installed in the shell, the shell has a mounting groove, the third limiting portion is located in the mounting groove, the length of the mounting groove in the third direction is greater than the length of the third limiting portion in the third direction, and is less than the length of the third limiting portion in the second direction.

13. The isolating switch according to claim 9, characterized in that: The fitting member includes a rivet, which is used to pass through the first fitting hole, the second fitting hole and the third fitting hole in sequence and to fix the elastic member, the first main body and the second main body.

14. The isolating switch according to any one of claims 1 to 13, characterized in that: The second contact includes a first clamping portion, the elastic member includes a second clamping portion, and the first clamping portion and the second clamping portion are clamped and connected to each other so that the first contact is clamped between the elastic member and the second contact.

15. The isolating switch according to claim 14, characterized in that: There are at least two first clamping parts and they are located on two opposite sides of the second main body. The first clamping parts extend relative to the second main body to a side close to the elastic member. At least two of the first clamping parts are provided with clamping holes, and the clamping holes of at least two of the first clamping parts are arranged opposite to each other. There are at least two second clamping parts and they are located on two opposite sides of the elastic member. At least two of the second clamping parts are inserted into at least two of the first clamping holes one by one for clamping.

16. The isolating switch according to any one of claims 1 to 15, characterized in that: The elastic member includes a first elastic member and a second elastic member, the first elastic member is located on a side of the first contact facing away from the second contact, the second elastic member is located on a side of the second contact facing away from the first contact, and the second elastic member is used to provide an elastic force to the second extension portion toward the first extension portion.

17. A power supply system, characterized in that: It comprises a control unit, a photovoltaic string, a power conversion unit and an isolating switch as described in any one of claims 1 to 16, wherein the isolating switch is electrically connected between the photovoltaic string and the power conversion unit, the control unit is used to send an electrical signal to the isolating switch when the photovoltaic string or the power conversion unit fails, and the isolating switch is used to control the contact or separation of the moving contact assembly and the static contact of the isolating switch according to the electrical signal.

18. A power conversion device, characterized in that: It comprises a power conversion unit, a control unit and an isolating switch as claimed in any one of claims 1 to 16; the isolating switch is electrically connected between the photovoltaic string and the power conversion unit, the control unit is used to send an electrical signal to the isolating switch when the photovoltaic string or the power conversion unit fails, and the isolating switch is used to control the contact or separation of the moving contact assembly and the static contact of the isolating switch according to the electrical signal.

19. A power conversion device, characterized in that: It includes a power conversion unit, a control unit and a switch device; The switch device is connected to the input end of the power conversion unit; The switch device comprises a rotating shaft and a multi-layer switch stacked along the extending direction of the rotating shaft, wherein the multi-layer switch comprises a first-layer switch and at least two second-layer switches; wherein the first-layer switch is the isolating switch according to any one of claims 1 to 16; The first layer of switches is used to simultaneously connect to the first poles of N photovoltaic strings, and each of the second layer of switches is used to connect to the second poles of some of the N photovoltaic strings; wherein the first pole is a positive pole or a negative pole, the second pole is another pole opposite to the first pole, and N is a positive integer greater than or equal to 2; the number of the first layer of switches is less than the number of the second layer of switches; The control unit is used to control the multi-layer switches in the switch device to disconnect in a coordinated manner when there is a reverse connection fault in the photovoltaic string, or when there is a short circuit fault in the photovoltaic string, or when a short circuit fault occurs at the output end of the power conversion unit, so as to disconnect the positive and negative poles of the photovoltaic string from the power conversion unit, and connect at most two or three photovoltaic strings in parallel among the N photovoltaic strings.

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