Contact system and changeover switch

Abstract

A contact system includes a contact support and a moving contact. The moving contact has moving contacts at both ends that mate with stationary contacts. The contact support has two raised mounting protrusions on the side away from the stationary contacts, and a clearance notch between the two mounting protrusions. Each of the two mounting protrusions of the contact support has at least one contact spring, and the contact springs on the two mounting protrusions are respectively connected to the two ends of the moving contact where the moving contacts are located. A changeover switch includes a housing and a contact system. The housing contains a load terminal, a power supply I terminal, and a power supply II terminal. The load terminal is electrically connected to the moving contact. Two stationary contacts are respectively located on the power supply I terminal and the power supply II terminal. In this invention, the contact support has a notch design on the side near the load terminal, and two mounting protrusions are spaced apart for mounting contact springs, saving space and increasing the rotation angle of the contact support.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a contact system and a changeover switch. Background Technology

[0002] The contact system is an important component of the transfer switchgear. The transfer switchgear uses the contact system to connect and disconnect power supply I and power supply II. For transfer switchgear with short switching time, the contact pressure achieved through overtravel and sufficient contact gap are necessary conditions for the stable connection and disconnection function between power supply I contacts and power supply II contacts.

[0003] However, the existing contact system structure of the changeover switch occupies a large space. Due to the limited space inside the changeover switch occupies a small rotation angle of the contact system, it cannot meet the requirements for large opening distance.

[0004] In addition, the contact system structure of existing changeover switchgear is relatively complex. The moving contact has two rotating supports at both ends, which makes the structure relatively complex. For example, one solution is to set two bosses at both ends of the moving contact, and the moving contact rotates by abutting against the bosses at the corresponding ends of the contact supports. Another solution is to set rotating shafts at both ends of the moving contact that are slidably connected to the contact supports, so that when the moving contact at one end contacts the corresponding stationary contact, the moving contact rotates around the rotating shaft at the other end. Utility Model Content

[0005] The purpose of this invention is to overcome at least one defect of the prior art and to provide a contact system and a changeover switch.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A contact system includes a rotatably mounted contact support and a movable contact mounted on the contact support. The movable contact has movable contacts at both ends that mate with stationary contacts. The contact support has two raised mounting protrusions on the side away from the stationary contacts, and a clearance notch between the two mounting protrusions. Each of the two mounting protrusions of the contact support has at least one contact spring. The contact springs on the two mounting protrusions are respectively connected to the two ends of the movable contact where the movable contacts are located. When the contact support drives the movable contact at either end of the movable contact to contact the corresponding stationary contact, the contact support rotates and compresses the contact spring corresponding to that end of the movable contact, causing the movable contact at that end to rotate and press against the corresponding stationary contact.

[0008] Optionally, the middle part of the moving contact is rotatably connected to the contact support via a rotating shaft, and the two moving contact points of the moving contact are located on the same side of the moving contact. When the contact support drives the moving contact point at either end of the moving contact to contact the corresponding stationary contact point, the contact support rotates in the direction of compressing the contact spring corresponding to that end of the moving contact and releasing the contact spring corresponding to the other end of the moving contact.

[0009] Optionally, the contact spring is a compression spring, with one end of the contact spring connected to the side of the moving contact away from the stationary contact, and the other end of the contact spring connected to the contact support.

[0010] Optionally, the contact support has a first through hole on each of its opposite sides, the moving contact and the contact spring are respectively disposed inside the contact support, and the moving contacts at both ends of the moving contact extend out of the contact support from the first through hole. The contact support has a second through hole in the clearance notch on the side away from the stationary contact. The contact support has two mounting protrusions and clearance notches on the side away from the stationary contact, so that the outer side of the contact support away from the stationary contact is U-shaped.

[0011] Optionally, the moving contact includes a moving contact body, which is an elongated strip structure. Both ends of the moving contact body extend in the length direction to form contact portions that extend out of the contact support. The moving contact is disposed on the contact portion. A wiring portion is provided on the side of the moving contact body away from the stationary contact in the width direction. The wiring portion extends out of the contact support from the second through hole.

[0012] Optionally, the contact support includes a connected contact support base and a contact support cover. The moving contact and the contact spring are respectively disposed between the contact support base and the contact support cover. The contact spring is disposed on the side of the moving contact away from the stationary contact and between the mounting protrusions of the contact support base and the contact support cover. The contact support base and the contact support cover are connected by a connecting shaft. The two mounting protrusions of the contact support are each provided with at least one connecting shaft on the side of the contact spring away from the stationary contact. The contact support is provided with at least one connecting shaft on the side of the moving contact close to the stationary contact.

[0013] Optionally, the moving contact is provided with a limiting surface located between two moving contacts, and the contact support is provided with two stop surfaces set at an included angle. The connection of the two stop surfaces is opposite to the rotation center of the moving contact, and the two stop surfaces are set at an obtuse angle on the side away from the moving contact. When the moving contact at any end of the moving contact contacts the corresponding stationary contact, the limiting surface is in contact with one stop surface and separates from the other stop surface.

[0014] Optionally, the contact support includes a connected contact support base and a contact support cover. The contact support base has a first protrusion protruding from the side near the stationary contact towards the contact support cover. The two mounting protrusions of the contact support base each have a second protrusion protruding towards the contact support cover. The contact support cover covers the first protrusion and the two second protrusions. A first through hole is formed between the first protrusion and the two second protrusions, and a second through hole is formed between the two second protrusions. The moving contact is rotatably disposed in the area enclosed by the first protrusion and the second protrusions. Two contact springs are respectively connected between the two second protrusions and the moving contact.

[0015] Optionally, the moving contact is provided with a first limiting post on the side facing the second protrusion, and the second protrusion of the contact support is provided with a limiting recess and a second limiting post located in the limiting recess on the side facing the moving contact. One end of the contact spring is sleeved on the first limiting post, and the other end of the contact spring is placed in the limiting recess and sleeved on the second limiting post.

[0016] And / or, the two mounting protrusions of the contact support seat are respectively provided with limiting grooves located between the second protrusion and the first protrusion, and the limiting grooves have arc-shaped walls that cooperate with the contact spring.

[0017] A changeover switch includes a housing and a contact system as described in any one of the claims. The contacts are rotatably mounted within the housing. The housing contains a load terminal, a power supply I terminal, and a power supply II terminal. The load terminal is electrically connected to the moving contact. Two stationary contacts are respectively disposed on the power supply I terminal and the power supply II terminal. When the moving contact corresponding to the power supply I terminal contacts the stationary contact on the power supply I terminal, the moving contact corresponding to the power supply II terminal separates from the stationary contact on the power supply II terminal. When the moving contact corresponding to the power supply II terminal contacts the stationary contact on the power supply II terminal, the moving contact corresponding to the power supply I terminal separates from the stationary contact on the power supply I terminal.

[0018] The contact system and changeover switch of this utility model have two mounting protrusions for mounting the contact spring on the side of the contact support away from the stationary contact, that is, the side closer to the load terminal. This makes the side of the contact support near the load terminal have a notch design, which not only saves space, but also provides more clearance space for the conductor connecting the moving contact and the load terminal, increases the rotation angle of the contact support, and meets the requirements of large opening distance.

[0019] Furthermore, the moving contact is rotatably mounted on the contact support via a single central pivot, resulting in a simple structure. When the moving contact alternately contacts the two stationary contacts, the two contact springs at both ends of the moving contact alternately provide the final contact pressure and overtravel. This ensures reliable and stable contact between the moving contact and one stationary contact through one contact spring, while also avoiding the reaction force of the other contact spring on the contact support. As a result, the contact support can drive the moving contact to quickly separate from the other stationary contact.

[0020] In addition, the contact spring uses a compression spring, which has better performance stability and allows the contact to make more reliable and stable contact.

[0021] In addition, the moving contact has a simple structure, which reduces the internal space occupied by the contact support. The moving contact is provided with a wiring part that extends out of the contact support for electrical connection with the load terminal. The electrical connection between the moving contact and the load terminal can be completed without disassembling the contact support.

[0022] Furthermore, when the moving contact rotates in the direction of contacting the stationary contact, the stop surface blocks the moving contact, preventing the moving contact from continuing to rotate forward after making excessive contact with the stationary contact. This avoids spring fatigue caused by the compression length of the contact spring exceeding the design value, improves the service life and reliability of the contact spring, and enhances the consistency of the final contact pressure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the contact system and load terminal of this utility model;

[0024] Figure 2 This is another schematic diagram of the contact system and load terminal of this utility model;

[0025] Figure 3 This is a schematic diagram of the contact system and load terminal of this utility model with the contact support cover removed;

[0026] Figure 4 This is a schematic diagram of the contact support base of this utility model.

[0027] Contact support 1; mounting protrusion 11; clearance notch 12; moving contact 2; moving contact point 21; moving contact body 22; contact part 23; wiring part 24; limiting surface 25; first limiting post 26; contact spring 3; contact support seat 4; rotating shaft 41; first through hole 42; second through hole 43; connecting shaft 44; first boss 45; stop surface 451; second boss 46; limiting notch 461; second limiting post 462; limiting groove 47; contact support cover 5; load terminal block 6; flexible connection 7. Detailed Implementation

[0028] The specific embodiments of the contact system and changeover switch of this utility model are further described below with reference to the accompanying drawings. The contact system and changeover switch of this utility model are not limited to the descriptions in the following embodiments.

[0029] like Figure 1 and Figure 2 As shown, the changeover switch of this embodiment includes a housing and a contact system. The housing contains a load terminal 6, a power supply I terminal, and a power supply II terminal (not shown in the figure). The load terminal 6 is located on one side of the contact system, while the power supply I and power supply II terminals are located on the other side. The contact system includes a rotatably mounted contact support 1 and a moving contact 2 mounted on the contact support 1. The moving contact 2 has moving contacts 21 at both ends that mate with stationary contacts. The two moving contacts 21 are located on the same side of the moving contact 2, i.e., the side of the moving contact 2 closest to the stationary contact. The load terminal 6 is electrically connected to the moving contact 2. The two stationary contacts are respectively located on the power supply I terminal and the power supply II terminal. The contact support 1 is rotatably mounted inside the housing and is used to drive the moving contact 2 to rotate, causing the moving contacts 21 on the moving contact 2 to contact and separate from the corresponding stationary contacts. The stationary contacts of power supply I terminals and power supply II terminals share a single moving contact 2. When the moving contact 21 on the moving contact 2 corresponding to the power supply I terminal contacts the stationary contact on the power supply I terminal, the moving contact 21 on the moving contact 2 corresponding to the power supply II terminal contacts the stationary contact on the power supply II terminal; when the moving contact 21 on the moving contact 2 corresponding to the power supply II terminal contacts the stationary contact on the power supply II terminal contacts the moving contact 2, the moving contact 21 on the moving contact 2 corresponding to the power supply I terminal contacts the stationary contact on the power supply I terminal.

[0030] It should be noted that the changeover switch is usually also equipped with a main shaft and an operating mechanism. The main shaft and the contacts support a 1-linkage connection. The operating mechanism includes a manual operating mechanism and / or an automatic operating mechanism. The changeover switch can be a two-position or three-position changeover switch. Taking a three-position changeover switch as an example, the operating mechanism drives the main shaft to rotate between three positions: power supply I closed, double open, and power supply II closed. When the main shaft rotates to the power supply I closed, double open, and power supply II closed positions, it drives the contact system to switch to the power supply I on state, double open state (i.e., power supply I and power supply II are both off), or power supply II on state, respectively. When the contact system is in the double-open state, the moving contacts 21 at both ends of the moving contact 2 are separated from the corresponding stationary contacts; when the contact system is in the power supply I-on state, the moving contact 21 on the moving contact 2 corresponding to the power supply I terminal is in contact with the stationary contact on the power supply I terminal, and the moving contact 21 on the moving contact 2 corresponding to the power supply II terminal is separated from the stationary contact on the power supply II terminal; when the contact system is in the power supply II-on state, the moving contact 21 on the moving contact 2 corresponding to the power supply II terminal is in contact with the stationary contact on the power supply II terminal, and the moving contact 21 on the moving contact 2 corresponding to the power supply I terminal is separated from the stationary contact on the power supply I terminal.

[0031] like Figure 3 and Figure 4 As shown, the improvement of this application is that the contact support 1 has two mounting protrusions 11 on the side away from the stationary contact, and a clearance notch 12 between the two mounting protrusions 11. At least one contact spring 3 is provided on each of the two mounting protrusions 11 of the contact support 1. The contact springs 3 of the two mounting protrusions 11 are respectively connected to the two ends of the moving contact 2 where the moving contact point 21 is provided. The contact spring 3 is used to provide the final contact pressure and overtravel. When the contact support 1 drives the moving contact point 21 at any end of the moving contact 2 to contact the corresponding stationary contact, the contact support 1 rotates and compresses the contact spring 3 corresponding to that end of the moving contact 2, thereby driving the moving contact 2 to rotate and pressing the moving contact point 21 at that end of the moving contact 2 onto the corresponding stationary contact. In this embodiment of the contact system and changeover switch, the contact support 1 has two mounting protrusions 11 spaced apart on the side away from the stationary contact, that is, on the side closer to the load terminal 6, for mounting the contact spring 3. This makes the side of the contact support 1 close to the load terminal 6 have a notch design, which not only saves space, but also provides more clearance space for the connecting conductor (i.e., flexible connection 7) between the moving contact 2 and the load terminal 6, and increases the rotation angle of the contact support 1 to meet the large opening distance requirement.

[0032] Specifically, the middle part of the moving contact 2 is rotatably connected to the contact support 1 via a rotating shaft 41. The rotating shaft 41 and the rotation center of the contact support 1 are concentric or eccentric. When the contact support 1 drives the moving contact 21 at either end of the moving contact 2 to contact the corresponding stationary contact, the contact support 1 rotates and compresses the contact spring 3 corresponding to that end of the moving contact 2, causing the moving contact 2 to rotate around the rotating shaft 41, pressing the moving contact 21 at that end of the moving contact 2 against the corresponding stationary contact. The moving contact 2 is rotatably mounted on the contact support 1 via a single rotating shaft 41 in the middle, which is simple in structure. When the moving contact 2 alternately contacts two stationary contacts, the two contact springs 3 at both ends of the moving contact 2 alternately provide the final contact pressure and overtravel. This ensures that the moving contact 2 can reliably and stably contact one stationary contact through one contact spring 3, while also avoiding the reaction force of the other contact spring 3 on the contact support 1. Thus, the contact support 1 can drive the moving contact 2 to quickly separate from the other stationary contact.

[0033] Preferably, the contact spring 3 is a compression spring. One end of the contact spring 3 is connected to the opposite side of the two moving contacts 21 on the moving contact 2, that is, the side of the moving contact 2 away from the stationary contact. The other end of the contact spring 3 is connected to the contact support 1. Using a compression spring for the contact spring 3 results in a smaller footprint, better performance stability, and more reliable and stable contact. Of course, the contact spring 3 can also be a torsion spring, leaf spring, etc.

[0034] Preferably, the contact support 1 has first through holes 42 on opposite sides. The moving contact 2 and the contact spring 3 are respectively disposed inside the contact support 1, and the moving contact points 21 at both ends of the moving contact 2 extend out of the contact support 1 from the first through holes 42. The contact support 1 has a second through hole 43 in a clearance notch 12 on the side away from the stationary contact. The contact support 1 has two mounting protrusions 11 and a clearance notch 12 on the side away from the stationary contact, making the outer side of the contact support 1 away from the stationary contact U-shaped. The outer side of the contact support 1 near the stationary contact is preferably arc-shaped, but it can also be straight or other shapes. The moving contact 2 and the contact spring 3 are compactly disposed inside the contact support 1, saving space.

[0035] Specifically, the moving contact 2 in this embodiment includes a moving contact body 22, which is an elongated strip structure. Both ends of the moving contact body 22 extend outwards to form contact portions 23 extending from the contact support 1. The moving contact 21 is disposed on the contact portion 23. A wiring portion 24 protrudes from the side of the moving contact body 22 away from the stationary contact in the width direction. The wiring portion 24 extends out of the contact support 1 from the second through hole 43. The load terminal 6 and the wiring portion 24 of the moving contact 2 are electrically connected via a flexible connector 7. One end of the flexible connector 7 is soldered to the load terminal 6, and the other end is soldered to the wiring portion 24 of the moving contact 2. The moving contact 2 in this embodiment has a simple structure, reducing the internal space occupied by the contact support 1. Furthermore, the moving contact 2 has a wiring portion 24 extending out of the contact support 1 for electrical connection with the load terminal 6, allowing for electrical connection between the moving contact 2 and the load terminal 6 without disassembling the contact support 1.

[0036] Preferably, the end of the contact portion 23 away from the moving contact body 22 is bent towards the stationary contact, making the contact portion 23 similar to an L-shape. The moving contact 21 is located on the end face of the contact portion 23 away from the moving contact body 22. That is, the width of the position where the moving contact 21 of the moving contact 2 is located is greater than the width of other parts of the moving contact 2, so as to strengthen the structure of the position where the moving contact 21 is located on the moving contact 2, and the moving contact 2 is not easily deformed even if it frequently opens and closes with the stationary contact.

[0037] Preferably, the moving contact 2 is provided with a limiting surface 25 located between the two moving contacts 21, and the contact support 1 is provided with two stop surfaces 451 set at an included angle. The connection of the two stop surfaces 451 is opposite to the rotation center of the moving contact 2. The two stop surfaces 451 are set at an obtuse angle on the side away from the moving contact 2. When the contact system is in a double-split state, that is, both moving contacts 21 are separated from their corresponding stationary contacts, the two stop surfaces 451 are respectively set at intervals opposite to the limiting surface 25. When the contact system is in a power supply I-on state or a power supply II-on state, that is, when the moving contact 21 at any end of the moving contact 2 is in contact with the corresponding stationary contact, the limiting surface 25 rotates toward one stop surface 451 and away from the other stop surface 451 until the limiting surface 25 is in contact with one stop surface 451 and separates from the other stop surface 451. When the moving contact 2 rotates in the direction of contacting the stationary contact, the stop surface 451 blocks the moving contact 2, which can prevent the moving contact 2 from continuing to rotate forward after making overtravel contact with the stationary contact. This avoids spring fatigue caused by the compression length of the contact spring 3 exceeding the design value, improves the service life and reliability of the contact spring 3, and enhances the consistency of the final contact pressure.

[0038] like Figure 1 , Figure 3 and Figure 4As shown, the contact support 1 in this embodiment includes a connected contact support base 4 and a contact support cover 5. The contact support base 4 has a first protrusion 45 protruding from the side near the stationary contact towards the contact support cover 5. The two mounting protrusions 11 of the contact support base 4 each have a second protrusion 46 protruding towards the contact support cover 5. The contact support cover 5 covers the first protrusion 45 and the two second protrusions 46. The first protrusion 45 and the two second protrusions 46 form a first through hole 42, and the two second protrusions 46 form a second through hole 43. The moving contact 2 and the contact spring 3 are respectively disposed between the contact support 4 and the contact support cover 5. The contact spring 3 is disposed on the side of the moving contact 2 away from the stationary contact and between the mounting protrusion 11 of the contact support 4 and the contact support cover 5. That is, the moving contact 2 is rotatably disposed in the area enclosed by the first protrusion 45 and the second protrusion 46. The contact support 4 has a protruding rotating shaft 41 in this area. The moving contact 2 has a rotating shaft hole in the middle that mates with the rotating shaft 41. The moving contact 2 is rotatably sleeved on the rotating shaft 41 through the rotating shaft hole in the middle. The two contact springs 3 are respectively connected between the two second protrusions 46 and the moving contact 2. That is, one contact spring 3 is connected between one second protrusion 46 and the moving contact 2, and the other contact spring 3 is connected between the other second protrusion 46 and the moving contact 2. In this embodiment, the rotating shaft 41 is integrally disposed with the contact support 1. Of course, the rotating shaft 41 can also be a separate shaft, which is separately disposed from the contact support 1 and the moving contact 2. The contact support 1 has a simple structure, which facilitates the compact arrangement of the moving contact 2 and the contact spring 3 inside the contact support 1. Of course, as another embodiment, the rotating shaft 41 can also be integrally arranged with the moving contact 2, that is, the rotating shaft 41 is provided with a protrusion on at least one side of the middle part of the moving contact 2. Correspondingly, at least one of the contact support seat 4 and the contact support cover 5 of the contact support 1 is provided with a rotating shaft hole that mates with the rotating shaft 41. The rotating shaft 41 in the middle of the moving contact 2 is rotatably inserted into the rotating shaft hole of the contact support 1.

[0039] In this embodiment, the contact support base 4 and the contact support cover 5 of the contact support 1 have different structures. Each of the two mounting protrusions 11 of the contact support base 4 is provided with a contact spring 3, that is, the contact system is provided with two contact springs 3. The contact support 1 in this embodiment is small in size and occupies little space. Of course, as another embodiment, if space permits, the size of the contact support 1 can be increased, that is, the contact support cover 5 adopts the same structure as the contact support base 4, and is also provided with a first protrusion 45 and two second protrusions 46. The two mounting protrusions 11 of the contact support cover 5 are also each provided with a contact spring 3, that is, the contact system is provided with four contact springs 3.

[0040] Preferably, the contact support base 4 and the contact support cover 5 are connected by a connecting shaft 44. The two mounting protrusions 11 of the contact support 1 each have at least one connecting shaft 44 on the side of the contact spring 3 away from the stationary contact point; that is, the two second protrusions 46 each protrude towards the contact support cover 5 and have at least one connecting shaft 44. The contact support 1 also has at least one connecting shaft 44 on the side of the moving contact 2 near the stationary contact point; that is, the first protrusion 45 each protrudes towards the contact support cover 5 and has at least one connecting shaft 44. The contact support cover 5 has a connecting shaft hole that mates with the connecting shaft 44, and the connecting shaft 44 of the contact support base 4 is riveted into the connecting shaft hole of the contact support cover 5. The reasonable arrangement of the connecting shaft 44 for connecting the contact support base 4 and the contact support cover 5 helps improve the reliability of the connection between them. In this embodiment, the connecting shaft 44 is integrally formed with the contact support base 4 and riveted to the contact support cover 5. Of course, the connecting shaft 44 can also be integrated with the contact support cover 5 and riveted to the contact support seat 4, or the connecting shaft 44 can be a separate shaft that is riveted to both the contact support seat 4 and the contact support cover 5.

[0041] In this embodiment, the limiting surface 25 is disposed on the side of the moving contact 2 facing the first protrusion 45, and the two stop surfaces 451 are disposed on the side of the first protrusion 45 of the contact support 1 facing the moving contact 2. Specifically, the first protrusion 45 is a hollow fan-shaped structure with an arc-shaped side and two straight sides. The outer sides of the two straight sides serve as two stop surfaces 451. A cylindrical structure is provided on the inner side of the arc-shaped side of the hollow fan-shaped structure. A connecting shaft 44 protrudes from the cylindrical structure, and a reinforcing rib is provided between the inner side of the connection between the two straight sides and the cylindrical structure.

[0042] Optionally, the moving contact 2 is provided with a first limiting post 26 on the side facing the second protrusion 46, and the second protrusion 46 of the contact support 4 is provided with a limiting recess 461 and a second limiting post 462 located in the limiting recess 461 on the side facing the moving contact 2. One end of the contact spring 3 is sleeved on the first limiting post 26, and the other end of the contact spring 3 is placed in the limiting recess 461 and sleeved on the second limiting post 462.

[0043] Optionally, the two mounting protrusions 11 of the contact support base 4 are respectively provided with limiting grooves 47 located between the second protrusion 46 and the first protrusion 45. The limiting grooves 47 have arc-shaped walls that cooperate with the contact spring 3, and the contact spring 3 is placed in the limiting grooves 47.

[0044] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0045] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A contact system comprising a rotatably mounted contact support (1) and a movable contact (2) mounted on the contact support (1), wherein the movable contact (2) has movable contacts (21) at both ends that cooperate with stationary contacts, characterized in that: The contact support (1) has two mounting protrusions (11) on the side away from the stationary contact, and a clearance notch (12) between the two mounting protrusions (11). At least one contact spring (3) is provided on each of the two mounting protrusions (11) of the contact support (1). The contact springs (3) of the two mounting protrusions (11) are respectively connected to the two ends of the moving contact (2) with moving contact points (21). When the contact support (1) drives the moving contact point (21) at any end of the moving contact (2) to contact the corresponding stationary contact, the contact support (1) rotates and compresses the contact spring (3) corresponding to that end of the moving contact (2), thereby driving the moving contact (2) to rotate and pressing the moving contact point (21) at that end of the moving contact (2) onto the corresponding stationary contact.

2. The contact system according to claim 1, characterized in that: The middle part of the moving contact (2) is rotatably connected to the contact support (1) via a rotating shaft (41). The two moving contacts (21) of the moving contact (2) are located on the same side of the moving contact (2). When the contact support (1) drives the moving contact (21) at any end of the moving contact (2) to contact the corresponding stationary contact, the contact support (1) rotates in the direction of compressing the contact spring (3) at that end of the moving contact (2) and releasing the contact spring (3) at the other end of the moving contact (2).

3. The contact system according to claim 1, characterized in that: The contact spring (3) is a compression spring. One end of the contact spring (3) is connected to the side of the moving contact (2) away from the stationary contact point, and the other end of the contact spring (3) is connected to the contact support (1).

4. The contact system according to claim 1, characterized in that: The contact support (1) has first through holes (42) on its opposite sides. The moving contact (2) and the contact spring (3) are respectively located inside the contact support (1). The moving contacts (21) at both ends of the moving contact (2) extend out of the contact support (1) from the first through holes (42). The contact support (1) has a second through hole (43) in the clearance notch (12) on the side away from the stationary contact. The contact support (1) has two mounting protrusions (11) and clearance notch (12) on the side away from the stationary contact, so that the outer side of the contact support (1) away from the stationary contact is U-shaped.

5. The contact system according to claim 4, characterized in that: The moving contact (2) includes a moving contact body (22), which is a long strip structure. Both ends of the moving contact body (22) extend to form contact portions (23) that protrude from the contact support (1). The moving contact (21) is disposed on the contact portion (23). A wiring portion (24) is provided on the side of the moving contact body (22) away from the stationary contact in the width direction. The wiring portion (24) protrudes from the contact support (1) through the second through hole (43).

6. The contact system according to claim 1, characterized in that: The contact support (1) includes a connected contact support base (4) and a contact support cover (5). The moving contact (2) and the contact spring (3) are respectively disposed between the contact support base (4) and the contact support cover (5). The contact spring (3) is disposed on the side of the moving contact (2) away from the stationary contact and between the mounting protrusions (11) of the contact support base (4) and the contact support cover (5). The contact support base (4) and the contact support cover (5) are connected by a connecting shaft (44). The two mounting protrusions (11) of the contact support (1) are respectively provided with at least one connecting shaft (44) on the side of the contact spring (3) away from the stationary contact. The contact support (1) is provided with at least one connecting shaft (44) on the side of the moving contact (2) close to the stationary contact.

7. The contact system according to claim 1, characterized in that: The moving contact (2) is provided with a limiting surface (25) located between two moving contacts (21). The contact support (1) is provided with two stop surfaces (451) set at an included angle. The connection of the two stop surfaces (451) is opposite to the rotation center of the moving contact (2). The two stop surfaces (451) are set at an obtuse angle on the side away from the moving contact (2). When the moving contact (21) at any end of the moving contact (2) contacts the corresponding stationary contact, the limiting surface (25) is in contact with one stop surface (451) and separates from the other stop surface (451).

8. The contact system according to claim 4, characterized in that: The contact support (1) includes a connected contact support base (4) and a contact support cover (5). The contact support base (4) has a first boss (45) protruding towards the contact support cover (5) on the side near the stationary contact. The two mounting protrusions (11) of the contact support base (4) have second bosses (46) protruding towards the contact support cover (5). The contact support cover (5) covers the first boss (45) and the two second bosses (46). The first boss (45) and the two second bosses (46) form a first through hole (42), and the two second bosses (46) form a second through hole (43). The moving contact (2) is rotatably disposed in the area enclosed by the first boss (45) and the second bosses (46). Two contact springs (3) are connected between the two second bosses (46) and the moving contact (2).

9. The contact system according to claim 8, characterized in that: The moving contact (2) has a first limiting post (26) on the side facing the second protrusion (46). The second protrusion (46) of the contact support base (4) has a limiting recess (461) and a second limiting post (462) located in the limiting recess (461) on the side facing the moving contact (2). One end of the contact spring (3) is sleeved on the first limiting post (26), and the other end of the contact spring (3) is placed in the limiting recess (461) and sleeved on the second limiting post (462). And / or, the two mounting protrusions (11) of the contact support base (4) are respectively provided with limiting grooves (47) located between the second protrusion (46) and the first protrusion (45), and the limiting grooves (47) have arc-shaped walls that cooperate with the contact spring (3).

10. A changeover switch, characterized in that: The device includes a housing and a contact system as described in any one of claims 1-9. The contact support (1) is rotatably mounted in the housing. The housing is provided with a load terminal (6), a power supply I terminal, and a power supply II terminal. The load terminal (6) is electrically connected to the moving contact (2). The two stationary contacts are respectively disposed on the power supply I terminal and the power supply II terminal. When the moving contact (21) on the moving contact (2) corresponding to the power supply I terminal contacts the stationary contact on the power supply I terminal, the moving contact (21) on the moving contact (2) corresponding to the power supply II terminal separates from the stationary contact on the power supply II terminal. When the moving contact (21) on the moving contact (2) corresponding to the power supply II terminal contacts the stationary contact on the power supply II terminal, the moving contact (21) on the moving contact (2) corresponding to the power supply I terminal separates from the stationary contact on the power supply I terminal.

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