Contact mechanism and changeover switch

Abstract

The application discloses a contact mechanism and a transfer switch, which comprises a moving contact assembly and a static contact group, the moving contact assembly moves along a straight line, the moving contact assembly comprises a contact support and a moving contact arranged on the contact support, a contact spring is arranged between the moving contact and the contact support, the contact spring is elastically deformed when the moving contact and the contact support relatively move, and an energy storage structure is arranged at least on one side of the moving contact assembly, the energy storage structure comprises an energy storage piece, during closing movement of the moving contact assembly, the moving contact is first locked and stopped from closing movement by the energy storage piece, the contact support continues to move to trigger the energy storage piece to move, so that the energy storage piece is unlocked from the moving contact assembly, and the moving contact assembly after being unlocked from the energy storage piece is rapidly closed to a position by the contact spring. In the application, the closing speed of the contact mechanism is improved by arranging the energy storage structure, and the service life of the contact mechanism is improved.

Description

Technical Field

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

[0002] Changeover switches enable the switching of load lines between two power sources. They are widely used in various uninterrupted power supply applications to ensure power supply reliability. Changeover switches typically switch between primary and backup power sources by switching the opening and closing of two sets of contact mechanisms. During use, the contact mechanisms are prone to having their service life affected by welding, electrical erosion, and other factors. Factors affecting the electrical wear of the contact mechanisms are usually related to the materials of the contact mechanisms and the opening and closing speed of the contact mechanisms. However, in existing products, the moving contact assembly is usually a bridge-type contact mechanism that moves in a straight line. But due to the lack of an energy storage structure to cooperate with the bridge-type contact mechanism, it is impossible to improve the closing speed of the contact mechanism. Summary of the Invention

[0003] The purpose of this invention is to overcome at least one defect of the prior art and to provide a contact mechanism and a changeover switch.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides a contact mechanism, including a moving contact assembly and a stationary contact assembly. The moving contact assembly moves linearly and includes a contact support and a moving contact disposed on the contact support. A contact spring is provided between the moving contact and the contact support, and the contact spring undergoes elastic deformation when the moving contact and the contact support move relative to each other.

[0006] An energy storage structure is provided on at least one side of the moving contact assembly. The energy storage structure includes an energy storage element. During the closing movement of the moving contact assembly, the moving contact is first locked to the energy storage element and stops closing movement. The contact supports continued closing movement to trigger the energy storage element to move, so that the energy storage element is unlocked from the moving contact assembly. The moving contact assembly, which is unlocked from the energy storage element, is driven by the contact spring to quickly close into position.

[0007] Preferably, the energy storage device is rotatably configured, including a locking part and an unlocking part. The moving contact includes at least one moving contact bridge, which is disposed through the contact support. One end of the moving contact bridge is limited and engaged with the locking part to lock the moving contact. The edge of the contact support is provided with a pushing part, which pushes the unlocking part to drive the energy storage device to rotate and unlock from the moving contact.

[0008] Preferably, the moving contact assembly moves along a first direction, each moving contact bridge is arranged in a second direction, two adjacent moving contact bridges are arranged side by side in a third direction, the stationary contact group includes two stationary contacts spaced apart in the second direction, the moving contact at one end of each moving contact bridge and the stationary contact at one end of each stationary contact are spaced apart and opposite each other in the first direction, and in the third direction, the thickness of the locking part is greater than or equal to the sum of the widths at one end of all moving contact bridges.

[0009] Preferably, the energy storage structure further includes a reset spring, which drives the energy storage component to reset.

[0010] Preferably, the return spring is coaxially rotatably assembled with the energy storage component, and one end of the return spring elastically abuts against the energy storage component; or, the return spring is connected to the side of the energy storage component opposite to the contact mechanism.

[0011] Preferably, the energy storage device is provided with a positioning part for limiting the rotation range of the energy storage device, and the positioning part is located on the side of the energy storage device opposite to the moving contact assembly.

[0012] Preferably, the energy storage structure further includes a support frame, and the energy storage component is rotatably mounted on the support frame.

[0013] Preferably, the support includes a receiving cavity with an opening facing the contact mechanism, and the energy storage element is rotatably assembled within the receiving cavity.

[0014] Preferably, the energy storage component includes a rotating part, the rotating part has a shaft hole in the middle, the rotating part extends radially toward the contact support direction to form a rod-shaped unlocking part, the rotating part extends toward the moving contact to form a limiting arm, the end of the limiting arm bends toward the moving contact to form a hook-shaped locking part, and the side of the limiting arm opposite to the locking part has a protruding positioning part.

[0015] The present invention also provides a changeover switch, including a housing and a switch electrode disposed within the housing, the switch electrode including two sets of contact mechanisms, wherein at least one set of contact mechanisms is the contact mechanism described above.

[0016] The contact mechanism and changeover switch of the present invention, by configuring an energy storage structure, allow the energy storage element to be first limited to the moving contact during the closing movement of the moving contact assembly so that the contact spring stores energy. This allows the moving contact to be quickly driven to close after unlocking from the energy storage element, thereby improving the closing speed of the contact mechanism and extending its service life.

[0017] In addition, the energy storage device is reset by a configured reset spring, which ensures that the energy storage device can automatically reset, which helps to maintain the overall stability of the energy storage structure.

[0018] Furthermore, by providing a positioning part for the energy storage component, the positioning part can be used to connect the return spring. In particular, the positioning part can also limit the swing range of the energy storage component, preventing the energy storage component from swinging and occupying too much space.

[0019] In addition, the moving contact is equipped with at least two moving contact bridges, and the thickness of the locking part is greater than the width of one moving contact bridge, which increases the mating area between the moving contact and the locking part and improves the mating stability between the moving contact and the energy storage device.

[0020] In addition, the energy storage device is directly installed inside the housing via a reset spring, which has the advantages of simple structure and low cost.

[0021] In addition, the energy storage components are rotatably mounted on the support, making the energy storage structure a modular structure that facilitates assembly. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the changeover switch in this invention;

[0023] Figure 2 This is a schematic diagram showing the cooperation of the energy storage structure, moving contact assembly, rotating shaft, and self-locking component in this invention;

[0024] Figure 3 This is a schematic diagram of the first energy storage structure in this invention;

[0025] Figure 4 This is a schematic diagram of the second energy storage structure in this invention;

[0026] Figure 5 yes Figure 4 A schematic diagram of the decomposition process;

[0027] Figure 6 This is a schematic diagram of the energy storage device in this invention;

[0028] Figure 7 This is a schematic diagram of the contact support structure in this invention;

[0029] Figure label:

[0030] 1-Housing, 2-Switch pole, 20-Terminal block, 21-Shaft, 211-Drive shaft, 2111-Drive unit, 212-Rotating disk, 2120-Central hole, 2121-Drive slot, 2122-Closing part, 2123-Connecting part, 22-Moving contact assembly, 221-Contact support, 2210-Mounting cavity, 2211-Hinge, 2212-Matching part, 2213-Baffle, 2214-Plug-in part, 2215-Baffle, 2216-Pushing part, 222- Moving contact, 2220-moving contact bridge, 2221-moving contact, 223-contact spring, 23-stationary contact, 232-stationary contact, 24-linkage component, 25-reset elastic component, 26-energy storage structure, 261-bracket, 2610-accommodating cavity, 2611-positioning groove, 262-energy storage component, 2621-locking part, 2622-unlocking part, 2623-positioning part, 263-reset spring, 264-mounting shaft, 27-self-locking component, 271-interlocking part, 28-arc extinguishing chamber. Detailed Implementation

[0031] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the contact mechanism and changeover switch of the present invention. The contact mechanism and changeover switch of the present invention are not limited to the descriptions in the following embodiments.

[0032] The changeover switch includes a housing 1, within which at least one switch pole 2 is disposed. Typically, there are two switch poles 2. When there are two or more switch poles 2 disposed within the housing 1, adjacent switch poles 2 are arranged side by side. Each switch pole 2 includes at least three terminals 20, two sets of contact mechanisms, and a rotating shaft 21. The three terminals 20 are divided into at least two incoming terminals and at least one outgoing terminal. The incoming and outgoing terminals are spaced apart at opposite ends of the housing 1. Each terminal 20 is connected to a wiring port on the housing 1 for connection to an external power supply. The two sets of contact mechanisms in each switch pole 2 are spaced apart. The rotating shaft 21 is rotatably mounted to drive the two sets of contact mechanisms to open and close the switch. Each set of contact mechanisms is connected between one incoming terminal and one outgoing terminal. That is, one set of contact mechanisms in the switch pole 2 is connected to the main power supply through the terminal 20 connected thereto, and the other set of contact mechanisms is connected to the backup power supply through the terminal 20 connected thereto. The rotating shaft 21 is located between the two sets of contact mechanisms. The rotating shaft 21 drives the two contact mechanisms in the same switch pole 2 to open and close. When the rotating shaft 21 drives one set of contact mechanisms to close, it drives the other set of contact mechanisms to open.

[0033] For ease of description, the two sets of contact mechanisms are spaced apart within the switch pole 2 along the first direction. Figure 1 In the middle, with the vertical direction as the first direction, the incoming and outgoing terminals are spaced apart in the switch pole 2 in the second direction. Figure 1In the middle, taking the left and right directions as the second direction, when there are two or more switch poles 2, adjacent switch poles 2 are arranged side by side in the third direction. Figure 1 In this context, the direction perpendicular to the paper is considered the third direction. This can be understood as the first direction, the second direction, and the third direction being perpendicular to each other.

[0034] Specifically, each contact mechanism includes a moving contact assembly 22 and a stationary contact group. The moving contact assembly 22 moves linearly in a first direction under the drive of the rotating shaft 21. The moving contact assembly 22 includes a contact support 221 and a moving contact 222 disposed on the contact support 221. A contact spring 223 is disposed between the moving contact 222 and the contact support 221. When relative movement occurs between the contact support 221 and the moving contact 222, the contact spring 223 undergoes elastic deformation. The stationary contact group of each contact mechanism includes two stationary contacts 2323 spaced apart in a second direction. In the first direction, each stationary contact 2323 is spaced apart from both ends of the moving contact 222 in the same contact mechanism.

[0035] like Figure 1 , 2 As shown, the improvement of this application is that an energy storage structure 26 is provided on at least one side of the moving contact assembly 22. The energy storage structure 26 includes an energy storage element 262. During the closing movement of the moving contact assembly 22, the moving contact 222 is first locked to the energy storage element 262 and stops closing movement. The contact support 221 continues to close movement, triggering the energy storage element 262 to move, so that the energy storage element 262 is unlocked from the moving contact assembly 22. The energy storage element 262 deforms between the contact support 221 that continues to close movement and the moving contact 222 that stops moving. The contact spring 223 drives the moving contact assembly 22, which is unlocked from the energy storage element 262, to quickly close into position.

[0036] Thus, by configuring the energy storage structure 26, during the closing movement of the moving contact assembly 22, the energy storage component 262 is first limited to the moving contact 222 so that the contact spring 223 stores energy, so that the moving contact 222 is quickly driven to close after unlocking from the energy storage component 262, thereby improving the closing speed of the contact mechanism and helping to extend the service life of the contact mechanism.

[0037] Specifically, in the first direction, the energy storage component 262 can be rotatably disposed on one side of the contact mechanism, and the contact support 221 can continue to move to trigger the energy storage component 262 to unlock and rotate. Alternatively, the energy storage component 262 can be slidably disposed on one side of the contact mechanism, and the contact support 221 can continue to move to trigger the energy storage component to unlock and move.

[0038] like Figure 1-6As shown, the energy storage component 262 includes a locking part 2621 and an unlocking part 2622. The moving contact 222 includes at least one moving contact bridge 2220. The moving contact bridge 2220 is disposed through the contact support 221 in the second direction. One end of the moving contact bridge 2220 is limited and engaged with the locking part 2621 to lock the moving contact 222. That is, after one end of the moving contact bridge 2220 is limited and engaged with the locking part 2621, the moving contact bridge 2220 stops moving along the first direction. 1. When the closing movement continues, the relative movement between the contact support 221 and the moving contact bridge 2220 causes the contact spring 223 to undergo elastic deformation. When the edge of the contact support 221 is provided with a pushing part 2216, the energy storage member 262 is pushed by the pushing part 2216 to rotate in the unlocking direction, causing one end of the moving contact bridge 2220 to be unlocked from the locking part 2621. Subsequently, the contact spring 223 releases the elastic force to drive the moving contact assembly 22 to move quickly in the closing direction.

[0039] Preferably, a positioning part 2623 is provided on the energy storage component 262. The positioning part 2623 can be located on the side of the energy storage component 262 facing away from the moving contact assembly 22. The positioning part 2623 is preferably a boss structure. The positioning part 2623 can be connected to a reset spring 263 for driving the energy storage component 262 to reset. Of course, by providing a boss or groove structure in the switch pole 2 that cooperates with the positioning part 2623, the rotation range of the energy storage component 262 is limited by the cooperation between the boss or groove and the positioning part 262. That is, when the positioning part 2623 abuts against the boss or groove, the energy storage component 262 is limited to continue to rotate.

[0040] Preferably, the moving contact 222 includes at least two moving contact bridges 2220. Each moving contact bridge 2220 is disposed on the contact support 221 in the second direction. One end of each moving contact bridge 2220 is provided with a moving contact point 2221. Each moving contact point 2221 is spaced apart from the stationary contact point of a stationary contact 2323 in the same contact mechanism in the first direction. In the third direction, the thickness of the locking part 2621 is greater than the width of one end of a moving contact bridge 2220, which increases the mating area between the moving contact bridge 2220 and the locking part 2621 and improves the mating stability between the moving contact 222 and the energy storage component 262.

[0041] Preferably, the energy storage structure 26 further includes a bracket 261, on which the energy storage component 262 is rotatably mounted, thereby forming a modular structure for easy assembly. Furthermore, the bracket 261 has an open cavity 2610 facing the contact mechanism, within which the energy storage component 262 is disposed, providing a relatively enclosed rotational space for the energy storage component 262 and preventing interference with other components. The energy storage structure 26 also includes a return spring 263, which drives the energy storage component 262 to return to its original position, thus maintaining the overall stability of the energy storage structure 26. The return spring 263 can be a torsion spring rotatably mounted coaxially with the energy storage component 262, or a section of spring connected to the energy storage component 262.

[0042] Combination Figure 1-7 A specific embodiment of a changeover switch is provided.

[0043] like Figure 1 As shown, the changeover switch includes a housing 1, within which a control electrode (not shown) and a switch electrode 2 are provided. Preferably, the control electrode and the switch electrode 2 are arranged side by side in a third direction. The control electrode can adopt existing technology, that is, the control electrode includes a circuit board, a motor and a gear set. The motor is connected to the circuit board, and a controller on the circuit board outputs a control signal to drive the motor to start and stop. The gear set is connected to the output shaft of the motor to drive the switch electrode 2 to perform opening and closing actions. The control electrode and the switch electrode 2 can be separated by a partition plate provided in the housing 1, or the control electrode and the switch electrode 2 each have their own housing, and the control electrode and the switch electrode 2 are assembled together through their respective housings.

[0044] like Figure 1As shown, the switch electrode 2 includes a terminal block 20, which is divided into an inlet terminal and an outlet terminal. The inlet and outlet terminals are spaced apart and opposite to each other in the second direction within the housing 1. Typically, the inlet and outlet terminals are arranged in pairs. Each switch electrode 2 includes two sets of contact mechanisms spaced apart in the first direction. A rotating shaft 21 is rotatably connected between the two sets of contact mechanisms. Each set of contact mechanisms includes a moving contact assembly 22 and a stationary contact assembly spaced apart and opposite to each other in the first direction. The moving contact assembly 22 is linked to the rotating shaft 21 through a linkage 24. The rotating shaft 21 drives the moving contact assembly 22 to move along the first direction for... In this embodiment, in conjunction with the stationary contact group, the two moving contact assemblies 22 are simultaneously driven by the rotating shaft 21 to move along the first direction. However, the two contact mechanisms cannot be connected at the same time. That is, one moving contact assembly 22 is in contact with one stationary contact group, while the other moving contact assembly 22 is separated from the other stationary contact assembly. Each contact mechanism is also equipped with an arc extinguishing system. Typically, the arc extinguishing system includes an arc extinguishing chamber 28. In the first direction, the arc extinguishing chamber 28 is arranged side by side with the contact mechanism, and the arc inlet faces the contact mechanism to extinguish the arc generated by the breakage of the contact mechanism, so that the arc can be introduced into the arc extinguishing chamber 28. The arc extinguishing chamber 28 can adopt existing technology.

[0045] Specifically, each contact mechanism includes a moving contact assembly 22 and a stationary contact assembly. The moving contact assembly 22 includes a contact support 221 and a moving contact 222 disposed on the contact support 221. A contact spring 223 is provided between the moving contact 222 and the contact support 221. When the moving contact 222 and the contact support 221 move relative to each other in the first direction, the contact spring 223 undergoes elastic deformation. When the circuit is closed, the elastic deformation of the contact spring 223 can provide contact pressure.

[0046] In an embodiment, such as Figure 7 As shown, the contact support 221 includes a block-shaped support body. A through groove serving as a mounting cavity 2210 is formed in the middle of the support body. Protruding mating portions 2212 and pushing portions 2216 extend outward from the two side edges of the mounting cavity 2210 along a second direction, respectively. The mating portions 2212 of the two contact supports 221 correspond to the same side inside the housing 1, and the pushing portions 2216 of the two contact supports 221 also correspond to the same side inside the housing 1. A partition 2213 is provided inside the mounting cavity 2210, which holds the contact support 2210 in place. The cavity 2210 is divided into two relatively independent contact cavities; one end of the support body is provided with a hinge portion 2211, and a drive hole for hinge with the linkage member 24 is provided in the middle of the hinge portion 2211; the other end of the support body is provided with a pair of spaced baffles 2215; the support body between the pair of baffles 2215 is provided with a protruding insertion portion 2214; the insertion portion 2214 can be used to connect the reset elastic member 25, thereby making the reset elastic member 25 and the linkage member 24 together form a drive assembly connected to the moving contact assembly 22.

[0047] The moving contact 222 includes at least one moving contact bridge 2220, which is disposed through the contact support 221 along a second direction. In a first direction, the moving contact bridge 2220 is spaced apart from the pushing part 2216 (fitting part 2212). In the second direction, both ends of the moving contact bridge 2220 extend beyond one pushing part 2216 (fitting part 2212) of the contact support 221. Each end of the moving contact bridge 2220 is provided with a moving contact point 2221. Preferably, the contact support 221 is provided with a mounting cavity 2210, and the moving contact bridge 2220 is disposed through the mounting cavity 2210, with both ends of the moving contact bridge 2220 extending outside the mounting cavity 2210.

[0048] The contact spring 223 is disposed within the mounting cavity 2210, and its two ends elastically abut against the contact support 221 and the moving contact bridge 2220, respectively. Alternatively, two or more moving contact bridges 2220 can be disposed within the mounting cavity 2210, with adjacent moving contact bridges 2220 arranged side-by-side in a third-order direction. Furthermore, a partition 2213 is disposed within the mounting cavity 2210, separating adjacent moving contact bridges 2220. Each moving contact bridge 2220 is correspondingly equipped with a contact spring 223.

[0049] In this embodiment, the stationary contact group includes two stationary contacts 2323 spaced apart in the second direction. Each stationary contact 2323 is provided with a stationary contact 232 that cooperates with the moving contact 2221. The stationary contact 232 and the moving contact 2221 are spaced apart and opposite to each other in the first direction. It should be noted that the number of stationary contacts 232 on each stationary contact 2323 can match the number of moving contacts 2221. When the number of moving contact bridges 2220 is more than two, the stationary contact 2323 can also be provided with only one stationary contact 232 with a larger area.

[0050] like Figure 1-6 As shown, the changeover switch contains at least one energy storage structure 26, which is located on one side of a moving contact assembly 22. Figure 1 In the middle, the energy storage structure 26 and the moving contact assembly 22 are arranged side by side in the second direction, and each group of contact mechanisms is equipped with one energy storage structure 26. Figure 1 In the energy storage structure 26, there are rotatingly assembled energy storage components 262. The energy storage components 262 are provided with a locking part 2621 and an unlocking part 2622. The thickness of the locking part 2621 in the third direction is greater than the width of one end of a moving contact bridge 2220. When there are two or more moving contact bridges 2220, preferably, the thickness of the locking part 2621 in the third direction is greater than or equal to the sum of the widths of the same end of all moving contact bridges 2220, which is beneficial for the locking part 2621 to cooperate with all moving contact bridges 2220.

[0051] During the closing movement of the moving contact assembly 22, the moving contact 222 is first locked to the locking part 2621 of the energy storage element 262 and the closing movement stops. The contact support 221 continues to move in the closing direction under the drive of the rotating shaft 21. However, the edge of the contact support 221 is provided with a pushing part 2216, which pushes the unlocking part 2622 to move or rotate in the unlocking direction. During this process, the relative movement between the moving contact 222 and the contact support 221 causes the contact spring 223 to undergo elastic deformation. As the contact support 221 moves in the closing direction, the contact support 221 triggers the energy storage element 262 to unlock, so that the moving contact 222 and the energy storage element 262 are released from the limit lock. When the moving contact 222 and the energy storage element 262 are separated, the contact spring 223 releases energy and drives the moving contact 222 to move the contact support 221 in the closing direction, that is, so that the moving contact assembly 22 is quickly closed in place.

[0052] In this embodiment, the energy storage structure 26 also includes a reset spring 263, which drives the energy storage component 262 to reset. That is, when the energy storage component 262 is driven to the unlock position, the reset spring 263 is pressed to store energy. In other words, when the contact mechanism is closed, the reset spring 263 is in the energy storage state. When the energy storage component 262 is separated from the contact support 221, that is, during the opening movement of the moving contact assembly 22, when the contact support 221 is separated from the energy storage component 262, the reset spring 263 releases energy to drive the energy storage component 262 to reset. Furthermore, the energy storage component 262 is also equipped with a bracket 261. The energy storage component 262 is rotatably mounted on the bracket 261, so that the energy storage component 262 and the bracket 261 can form a modular structure, which facilitates the overall assembly of the energy storage structure 26 on one side of the moving contact assembly 22.

[0053] Combination Figure 1-3 6 provides the first type of energy storage structure 26 used in this embodiment.

[0054] like Figure 1-3As shown in Figure 6, the energy storage structure includes an energy storage component 262 and a return spring 263. The energy storage component 262 is rotatably mounted on one side of each set of contact mechanisms, and the two energy storage structures are located on the same side of the two sets of contact mechanisms. The energy storage component 262 includes a cylindrical rotating part with a shaft hole in the middle. The rotating part extends radially outward to form a rod-shaped unlocking part 2622. The other side of the rotating part extends outward to form an approximately straight rod-shaped limiting arm, and a gap is left between the limiting arm and the unlocking part 2622. The extension length of the limiting arm is... The length of the limiting arm is greater than that of the unlocking part 2622. The end of the limiting arm bends towards the side where the unlocking part 2622 is located to form a hook-shaped locking part 2621. In this embodiment, the limiting arm extends from the rotating part towards the moving contact 222 to form the limiting arm. The width of the limiting arm is greater than or equal to the axial width of the rotating part, thereby making the thickness of the locking part 2621 in the third direction greater than or equal to the sum of the widths of one end of all the moving contact bridges 2220, which facilitates the locking part 2621 and the limiting arm locking to one end of all the moving contact bridges 2220 in the moving contact 222. A positioning part 2623 protrudes from the side of the limiting arm opposite to the unlocking part 2622. Figure 3 , 6 In the middle, the positioning part 2623 is a circular boss, and a return spring 263 is connected to the positioning part 2623. The other end of the return spring 263 is connected to the inside of the outer casing 1. Figure 3 In the middle, the return spring 263 undergoes elastic deformation along a direction parallel to the second direction, thereby driving the limit arm to swing.

[0055] Combination Figure 4-6 A second energy storage structure 26 is provided for application in this embodiment.

[0056] like Figure 4-6 As shown, the energy storage structure 26 includes a bracket 261, which has an overall U-shaped structure, giving it an open cavity 2610 facing the contact mechanism. A pair of sidewalls of the cavity 2610 have shaft holes, within which a mounting shaft 264 for rotating and assembling the energy storage component 262 is provided. Preferably, one sidewall has a circular boss protruding from the corresponding shaft hole. The protrusion height of this circular boss can compensate for the gap between the energy storage component 262 and the cavity 2610, preventing unnecessary shaking of the energy storage component 262 within the cavity 2610 during rotation. The sidewall of the cavity 2610 opposite the open cavity has a positioning groove. In this embodiment, the positioning groove is a circular recess, used to cooperate with a positioning part 2623 provided on the energy storage component 262 to limit the swing range of the energy storage component 262.

[0057] like Figure 4-6As shown, the energy storage component 262 is similar in structure to the energy storage component 262 in the first energy storage structure. Both energy storage components 262 include a cylindrical rotating part with a shaft hole in the center. The rotating part extends radially outward to form a rod-shaped unlocking part 2622. The other side of the rotating part extends outward to form an approximately straight rod-shaped limiting arm, with a gap between the limiting arm and the unlocking part 2622. The extension length of the limiting arm is greater than the length of the unlocking part 2622. The end of the limiting arm bends towards the side with the unlocking part 2622 to form a hook-shaped locking part 2621. In this embodiment, the width of the limiting arm is greater than or equal to the axial width of the rotating part, thereby making the thickness of the locking part 2621 in the third direction greater than or equal to the sum of the widths of one end of all moving contact bridges 2220, which facilitates the locking part 2621 and the limiting arm locking one end of all moving contact bridges 2220 in the moving contact 222. A positioning part 2623 protrudes from the side of the limiting arm opposite to the unlocking part 2622. Figure 6 In the middle, the positioning part 2623 is a circular boss. When the positioning part 2623 is engaged with the positioning groove 2611 of the bracket 261, the energy storage component 262 stops rotating, thereby limiting its swing range.

[0058] Of course, when the bracket 261 is U-shaped, the side wall of the receiving cavity 2610 opposite to the opening and the limiting arm can cooperate to limit the swing range of the energy storage component 262. In this case, the structure of the positioning part 2623 and the positioning groove 2611 can be omitted. In addition, when the energy storage structure 26 is not equipped with the bracket 261, the positioning groove 2611 that cooperates with the positioning part 2623 can be set on the fixed part inside the outer shell 1.

[0059] In this structure, the return spring 263 is a torsion spring. The return spring 263 and the energy storage component 262 are coaxially and rotatably assembled in the bracket 261. One end of the return spring 263 abuts against the receiving cavity 2610, and the other end elastically abuts against the energy storage component 262, thereby resetting the energy storage component 262. Alternatively, the return spring 263 can also be a segment spring; in this case, the return spring 263 can be connected between the positioning part 2623 and the receiving cavity 2610. Figure 1 As shown, the rotating shaft 21 is rotatably mounted between two sets of contact mechanisms. The axis of rotation of the rotating shaft 21 is parallel to a third direction. The rotating shaft 21 is connected to the hinge portion 2211 of a contact support 221 via a linkage 24. The rotating shaft 21 can be a single-piece structure or a split structure. In this embodiment, a split structure is preferred for the rotating shaft 21. Figure 1 , 2 As shown, the rotating shaft 21 includes a drive shaft, on which two rotating disks are coaxially mounted. Each rotating disk is driven to rotate by the drive shaft, and each rotating disk is connected to a moving contact assembly 22 through a linkage 24.

[0060] Furthermore, each contact support 221 is also connected to a reset elastic element 25. Figure 1 , 2 In the process, the reset elastic element 25 is elastically connected between the insertion part 2214 of the contact support 221 and the outer shell 1. The reset elastic element 25 and the linkage element 24 connected on the same contact support 221 together form a set of drive components. The drive components convert the circumferential rotation of the rotating shaft 21, so that the contact mechanism performs opening and closing movements along a straight line.

[0061] Furthermore, such as Figure 1 As shown, the switch pole 2 in this embodiment is also equipped with a self-locking member 27. The self-locking member 27 cooperates with the contact supports 221 of the two sets of contact mechanisms. The self-locking member 27 is driven by the closing contact support 221 to move in the first direction within the housing 1 (shell). When one set of contact mechanisms cannot open, the self-locking member 27 moves under the drive of the contact support 221 of the other set of contact mechanisms, causing the non-opening contact mechanism to open. Thus, when the changeover switch is performing normal opening and closing, the self-locking member 27 is driven by one set of moving contact assemblies 22, avoiding interference with the opening and closing actions of the two sets of contact mechanisms. When one set of contact mechanisms cannot open, it can be forcibly opened by the self-locking member 27, preventing the two sets of contact mechanisms from closing simultaneously, thus improving safety. Of course, when one set of contact mechanisms cannot open, the self-locking member 27 is limited by the non-opening contact mechanism, preventing the other set of contact mechanisms from closing, which also prevents the two sets of contact mechanisms from closing simultaneously.

[0062] The self-locking member 27 is preferably arranged side by side in the second direction on the same side of the two sets of contact mechanisms and the rotating shaft 21. The self-locking member 27 includes a rod-shaped body, and interlocking parts 271 protrude from both ends of the rod-shaped body. In the first direction, each interlocking part 271 is arranged between the moving contact bridge 2220 and the mating part 2212 of a moving contact assembly 22, and there is a certain gap between the interlocking part 271 and the moving contact bridge 2220 and the mating part 2212. The distance between the two interlocking parts 271 of the self-locking member 27 is less than the maximum distance between the mating parts 2212 in the two sets of contact mechanisms. In this embodiment, the maximum distance between the mating parts 2212 in the two sets of contact mechanisms is the spacing when the two sets of contact mechanisms are closed at the same time.

[0063] During normal opening and closing, the mating part 2212 of the contact support 221 that moves the closing position pushes the interlocking part 271, causing the passive contact assembly 22 of the self-locking member 27 to move. When one set of contact mechanisms is welded and cannot open, the mating part 2212 of the other set of moving contact assemblies 22 cooperates with the corresponding interlocking part 271 to drive the self-locking member 27 to move. However, since the other set of contact mechanisms is still in the closed state, the distance between the two interlocking parts 271 on the self-locking member 27 is fixed. Thus, the other interlocking part 271 pushes the mating part 2212, causing the contact mechanism that cannot open to open. Alternatively, the self-locking member 27 and the contact mechanism that cannot open are jointly limited, preventing the other set of contact mechanisms from closing.

[0064] In this embodiment, the arc extinguishing system cooperating with each group of contact mechanisms includes only one arc extinguishing chamber 28. In the first direction, the arc extinguishing chamber 28 is arranged side by side with the adjacent contact structure, and the two arc extinguishing chambers 28 are located on the same side of the two groups of contact mechanisms. That is, in the first direction, the arc extinguishing system and the self-locking member 27 are respectively located on both sides of the same contact mechanism (rotating shaft 21). The moving contact portion at one end of each moving contact 222 cooperates with a stationary contact 23 at the arc inlet of the arc extinguishing chamber 28 for opening and closing. In the second direction, the arc extinguishing chambers 28 of the two arc extinguishing systems are spaced apart and opposite each other.

[0065] It should be noted that in the description of this invention, 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 conventionally placed during use. They are used only for ease of description and do not indicate that the device or element referred to must have a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating relative importance.

[0066] 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 scope of protection of the present invention.

Claims

1. A contact mechanism, comprising a moving contact assembly (22) and a stationary contact assembly, wherein the moving contact assembly (22) moves linearly, the moving contact assembly (22) comprising a contact support (221) and a moving contact (222) disposed on the contact support (221), wherein a contact spring (223) is provided between the moving contact (222) and the contact support (221), and the contact spring (223) undergoes elastic deformation when the moving contact (222) moves relative to the contact support (221). Its features are: An energy storage structure (26) is provided on at least one side of the moving contact assembly (22). The energy storage structure (26) includes an energy storage element (262). During the closing movement of the moving contact assembly (22), the moving contact (222) is first locked to the energy storage element (262) and stops closing movement. The contact support (221) continues to close movement, triggering the energy storage element (262) to move, so that the energy storage element (262) is unlocked from the moving contact assembly (22). The moving contact assembly (22) after being unlocked from the energy storage element (262) is driven by the contact spring (223) to quickly close into position.

2. The contact mechanism according to claim 1, characterized in that: The energy storage device (262) is rotatably configured and includes a locking part (2621) and an unlocking part (2622). The moving contact (222) includes at least one moving contact bridge (2220). The moving contact bridge (2220) is disposed through the contact support (221). One end of the moving contact bridge (2220) is limited and cooperated with the locking part (2621) to lock the moving contact (222). The edge of the contact support (221) is provided with a pushing part (2216). The pushing part (2216) pushes the unlocking part (2622) to drive the energy storage device (262) to rotate and unlock the moving contact (222).

3. The contact mechanism according to claim 2, characterized in that: The moving contact assembly (22) moves along a first direction, each moving contact bridge (2220) is arranged in a second direction, and two adjacent moving contact bridges (2220) are arranged side by side in a third direction. The stationary contact group includes two stationary contacts (2323) spaced apart in the second direction. The moving contact point (2221) at one end of each moving contact bridge (2220) and the stationary contact point (232) of each stationary contact (2323) are spaced apart and opposite to each other in the first direction. In the third direction, the thickness of the locking part (2621) is greater than or equal to the sum of the widths of one end of all moving contact bridges (2220).

4. The contact mechanism according to claim 1, characterized in that: The energy storage structure (26) also includes a reset spring (263), which drives the energy storage component (262) to reset.

5. The contact mechanism according to claim 4, characterized in that: The reset spring (263) is coaxially and rotatably assembled with the energy storage component (262), with one end of the reset spring (263) elastically abutting against the energy storage component (262); or, the reset spring (263) is connected to the side of the energy storage component (262) opposite to the contact mechanism.

6. The contact mechanism according to claim 1, characterized in that: The energy storage device (262) is provided with a positioning part (2623) for limiting the rotation range of the energy storage device (262), and the positioning part (2623) is located on the side of the energy storage device (262) opposite to the moving contact assembly (22).

7. The contact mechanism according to any one of claims 1-6, characterized in that: The energy storage structure (26) also includes a support (261), and the energy storage component (262) is rotatably mounted on the support (261).

8. The contact mechanism according to claim 7, characterized in that: The bracket (261) includes a receiving cavity (2610) open to the contact mechanism, and the energy storage element (262) is rotatably assembled in the receiving cavity (2610).

9. The contact mechanism according to claim 1, characterized in that: The energy storage component (262) includes a rotating part, the middle of which is provided with a shaft hole. The rotating part extends radially toward the contact support direction to form a rod-shaped unlocking part (2622). The rotating part extends toward the moving contact (222) to form a limiting arm. The end of the limiting arm is bent toward the side near the moving contact (222) to form a hook-shaped locking part (2621). The side of the limiting arm opposite to the locking part (2621) is provided with a protruding positioning part (2623).

10. A changeover switch, comprising a housing (1) and a switch electrode (2) disposed within the housing (1), the switch electrode (2) comprising two sets of contact mechanisms, characterized in that: At least one of the contact mechanisms is the contact mechanism as described in any one of claims 1-9.

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