Contact mechanism and change-over switch

Abstract

The contact mechanism 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, and the contact spring is elastically deformed when the moving contact and the contact support move relatively. At least one side of the moving contact assembly is provided with an energy storage structure, the energy storage structure comprises an energy storage piece, in the closing movement process of the moving contact assembly, the moving contact and the energy storage piece are limited and locked firstly and stop closing movement, the contact support continues closing movement to trigger the energy storage piece to move, the energy storage piece and the moving contact assembly are unlocked, and the energy storage piece is unlocked from the moving contact assembly. The contact spring drives the moving contact assembly which is unlocked with the energy storage member to be quickly switched on in place. According to the utility model, the energy storage structure is configured, so that the closing speed of the contact mechanism is improved, and the service life of the contact mechanism is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to low voltage electrical apparatus field, concretely relates to a contact mechanism and change over switch. BACKGROUND

[0002] The change over switch realizes the conversion of load line between two power sources, and is widely applied to various uninterrupted power supply places to ensure power supply reliability. The change over switch generally realizes the switching of normal and standby power sources by switching the opening and closing of two contact mechanisms. In use, the contact mechanism is prone to affecting the service life due to welding, electric erosion and the like. Factors affecting the electric wear of the contact mechanism are generally related to the material of the contact mechanism and the opening and closing speed of the contact mechanism. However, in the existing products, the movable contact assembly is generally a bridge type contact mechanism moving along a straight line. However, due to the lack of an energy storage structure matched with the bridge type contact mechanism, the closing speed of the contact mechanism cannot be improved. SUMMARY

[0003] The utility model discloses a contact mechanism and change over switch which overcome at least one defect of the prior art.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] The utility model provides a contact mechanism, including movable contact component and static contact group, movable contact component moves along a straight line, movable contact component includes contact support and movable contact who sets up on contact support, be equipped with contact spring between movable contact and contact support, contact spring occurs elastic deformation when movable contact and contact support relative movement,

[0006] At least one side of the movable contact assembly is configured with an energy storage structure, the energy storage structure includes an energy storage member, during the closing movement of the movable contact assembly, the movable contact is first limited and locked with the energy storage member and stops closing movement, the contact support continues to close and moves to trigger the movement of the energy storage member, so that the energy storage member is unlocked with the movable contact assembly, and the movable contact assembly after being unlocked with the energy storage member is driven by the contact spring to close quickly in place.

[0007] Preferably, the energy storage member is rotatably arranged and includes a locking portion and an unlocking portion, the movable contact includes at least one movable contact bridge, the movable contact bridge is arranged through the contact support, one end of the movable contact bridge is limited and matched with the locking portion to lock the movable contact, an edge of the contact support is provided with a pushing portion, the pushing portion pushes the unlocking portion to drive the energy storage member to rotate and unlock the movable contact.

[0008] Preferably, the movable contact assembly moves in a first direction, each movable contact bridge is arranged in a second direction, two adjacent movable contact bridges are arranged side by side in a third direction, the fixed contact group comprises two fixed contacts arranged in the second direction, the movable contact of one end of each movable contact bridge is spaced from the fixed contact of each fixed contact in the first direction, and the thickness of the locking portion is greater than or equal to the sum of the widths of one end of all movable contact bridges in the third direction.

[0009] Preferably, the energy storage structure further comprises a reset spring, and the energy storage member is driven to reset by the reset spring.

[0010] Preferably, the reset spring is coaxially arranged with the energy storage member, and one end of the reset spring elastically abuts against the energy storage member; or the reset spring is connected to one side of the energy storage member which is away from the contact mechanism.

[0011] Preferably, the energy storage member is provided with a positioning portion for limiting the rotation range of the energy storage member, and the positioning portion is located at one side of the energy storage member which is away from the movable contact assembly.

[0012] Preferably, the energy storage structure further comprises a bracket, and the energy storage member is rotatably arranged on the bracket.

[0013] Preferably, the bracket comprises a containing cavity which is open towards the contact mechanism, and the energy storage member is rotatably arranged in the containing cavity.

[0014] Preferably, the energy storage member comprises a rotating portion, a shaft hole is arranged in the middle of the rotating portion, the rotating portion extends in a radial direction to form a rod-shaped unlocking portion which is close to the contact support, the rotating portion extends to form a limiting arm in the moving direction of the movable contact, the end of the limiting arm is bent to form a hook-shaped locking portion which is close to the movable contact, and a protruding positioning portion is arranged at one side of the limiting arm which is away from the locking portion.

[0015] The utility model also provides a change-over switch, including shell and setting in the switch pole of shell, the switch pole includes two groups of contact mechanism, wherein at least one group of contact mechanism is the contact mechanism as described above.

[0016] The contact mechanism and the change-over switch of the utility model, through the configuration energy storage structure, in the movable contact assembly closing moving process, make the energy storage member first with movable contact limiting to make the contact spring energy storage, make the movable contact be driven closing after unlocking with the energy storage member, improve the closing speed of contact mechanism, benefit in improving the service life of contact mechanism.

[0017] In addition, the energy storage member is reset through the reset spring, which ensures that the energy storage member can be automatically reset, and helps to maintain the overall stability of the energy storage structure.

[0018] In addition, by arranging the positioning part for the energy storage member, the positioning part can be used for connecting the return spring, and the swing range of the energy storage member can be limited by the positioning part, so that the energy storage member does not occupy too much space.

[0019] In addition, the moving contact is arranged with at least two moving contact bridges, the thickness of the locking part is greater than the width of one moving contact bridge, the matching area of the moving contact and the locking part is increased, and the matching stability of the moving contact and the energy storage member is improved.

[0020] In addition, the energy storage member is directly arranged in the shell through the return spring, and has the advantages of simple structure and low cost.

[0021] In addition, the energy storage member is rotatably arranged on the support, so that the energy storage structure forms a modular structure, and assembly is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the change-over switch in the utility model;

[0023] Figure 2 is a matching schematic view of the energy storage structure, the moving contact assembly, the rotating shaft and the self-locking part in the utility model;

[0024] Figure 3 is a structural schematic view of the first energy storage structure in the utility model;

[0025] Figure 4 is a structural schematic view of the second energy storage structure in the utility model;

[0026] Figure 5 is Figure 4 an exploded schematic view;

[0027] Figure 6 is a structural schematic view of the energy storage member in the utility model;

[0028] Figure 7 is a structural schematic view of the contact support in the utility model;

[0029] REFERENCE SIGNS:

[0030] 1 - housing, 2 - switch pole, 20 - terminal, 21 - rotating shaft, 2111 - driving part, 2120 - central hole, 2121 - driving groove, 2122 - closing part, 2123 - connecting part, 22 - movable contact assembly, 221 - contact support, 2210 - mounting cavity, 2211 - hinged part, 2212 - matching part, 2213 - partition, 2214 - insertion part, 2215 - baffle, 2216 - pushing part, 222 - movable contact, 2220 - movable contact bridge, 2221 - movable contact point, 223 - contact spring, 23 - static contact, 232 - static contact point, 24 - linkage, 25 - reset elastic member, 26 - energy storage structure, 261 - bracket, 2610 - containing cavity, 2611 - positioning groove, 262 - energy storage member, 2621 - locking part, 2622 - unlocking part, 2623 - positioning part, 263 - reset spring, 264 - mounting shaft, 27 - self-locking member, 271 - interlocking part, 28 - arc extinguishing chamber. DETAILED DESCRIPTION

[0031] The embodiments of the contact mechanism and the change-over switch of the utility model are further illustrated below in combination with the drawings. The contact mechanism and the change-over switch of the utility model are not limited to the description of the following embodiments.

[0032] The change-over switch comprises a housing 1, at least one switch pole 2 is arranged in the housing 1, usually, the number of switch poles 2 is two, when two or more switch poles 2 are arranged in the housing 1, two adjacent switch poles 2 are arranged side by side, each switch pole 2 comprises at least three terminals 20, two groups 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 terminals and the outgoing terminals are arranged at opposite ends of the housing 1, each terminal 20 is arranged in the terminal hole of the housing 1 and is used for connecting with the external power supply, the two groups of contact mechanisms in each switch pole 2 are arranged at intervals, the rotating shaft 21 is rotatably arranged and is used for driving the two groups of contact mechanisms to open and close, each group of contact mechanisms is connected between one incoming terminal and one outgoing terminal, that is, one group of contact mechanisms in the switch pole 2 is connected with the commonly used power supply through the terminal 20 connected therewith, and the other group of contact mechanisms is connected with the standby power supply through the terminal 20 connected therewith. The rotating shaft 21 is arranged between the two groups of contact mechanisms, the rotating shaft 21 is driven to rotate, the two groups of contact mechanisms in the same switch pole 2 are driven to open and close by the rotating shaft 21, and the rotating shaft 21 drives one group of contact mechanisms to close, and drives the other group of contact mechanisms to open.

[0033] For the convenience of description, the two groups of contact mechanisms are arranged at intervals in the switch pole 2 along a first direction, Figure 1 In the embodiment, the downward direction is the first direction, the incoming terminals and the outgoing terminals are arranged at intervals in the switch pole 2 along a second direction, Figure 1In the embodiment, the left-right direction is the second direction, and when the number of switch poles 2 is two or more, two adjacent switch poles 2 are arranged side by side in the third direction, Figure 1 In the embodiment, the direction perpendicular to the paper surface is the third direction, and it can be understood that the first direction, the second direction and the third direction are perpendicular to each other.

[0034] Specifically, each group of contact mechanisms includes a moving contact assembly 22 and a stationary contact group, wherein the moving contact assembly 22 moves linearly in the first direction under the driving of the rotating shaft 21, the moving contact assembly 22 includes a contact support 221 and a moving contact 222 arranged on the contact support 221, and a contact spring 223 is arranged between the moving contact 222 and the contact support 221, and the contact spring 223 elastically deforms when the contact support 221 and the moving contact 222 move relative to each other; the stationary contact group of each group of contact mechanisms includes two stationary contacts 2323 arranged in the second direction, and each stationary contact 2323 is spaced apart from the two ends of the moving contact 222 in the same contact mechanism in the first direction.

[0035] As shown in Figure 1 , 2 The improvement of the application is that an energy storage structure 26 is arranged on at least one side of the moving contact assembly 22, the energy storage structure 26 includes an energy storage member 262, during the closing movement of the moving contact assembly 22, the moving contact 222 is first limited and locked with the energy storage member 262 and stops the closing movement, the contact support 221 continues to move to trigger the energy storage member 262 to move, so that the energy storage member 262 is unlocked with the moving contact assembly 22, and the energy storage member 262 is deformed between the contact support 221 which continues to move and the moving contact 222 which stops moving, and the moving contact assembly 22 which is unlocked with the energy storage member 262 is quickly closed to the position under the driving of the contact spring 223.

[0036] In this way, by arranging the energy storage structure 26, the energy storage member 262 is first limited with the moving contact 222 during the closing movement of the moving contact assembly 22 to store energy of the contact spring 223, so that the moving contact 222 is quickly driven to close after being unlocked with the energy storage member 262, which improves the closing speed of the contact mechanism and is beneficial to improving the service life of the contact mechanism.

[0037] Specifically, in the first direction, the energy storage member 262 can be rotatably arranged on one side of the contact mechanism, and the contact support 221 continues to move to trigger the energy storage member 262 to unlock and rotate, or the energy storage member 262 is slidably arranged on one side of the contact mechanism, and the contact support 221 continues to move to trigger the energy storage member to unlock and move.

[0038] As shown in Figures 1-6As shown, the energy storage member 262 includes a locking portion 2621 and an unlocking portion 2622, the movable contact 222 includes at least one movable contact bridge 2220, the movable contact bridge 2220 is arranged on the contact support 221 in the second direction, one end of the movable contact bridge 2220 is in position cooperation with the locking portion 2621 to lock the movable contact 222, that is, after one end of the movable contact bridge 2220 is in position cooperation with the locking portion 2621, the movable contact bridge 2220 stops moving in the first direction, when the contact support 221 continues to move in the closing direction, the relative movement between the contact support 221 and the movable contact bridge 2220 causes the contact spring 223 to elastically deform, when the edge of the contact support 221 is provided with a pushing portion 2216, the energy storage member 262 is pushed to rotate in the unlocking direction by the pushing portion 2216, so that one end of the movable contact bridge 2220 is unlocked from the locking portion 2621, and then the elastic force of the contact spring 223 is released to drive the movable contact assembly 22 to quickly move in the closing direction.

[0039] Preferably, the energy storage member 262 is provided with a positioning portion 2623, which can be located on the side of the energy storage member 262 away from the movable contact assembly 22, the positioning portion 2623 is preferably a boss structure, and the positioning portion 2623 can be connected to a reset spring 263 for driving the energy storage member 262 to reset. Of course, a boss or a groove structure cooperating with the positioning portion 2623 can be formed in the switch pole 2 to limit the rotation range of the energy storage member 262, that is, when the positioning portion 2623 abuts against the boss or the groove to limit the continuous rotation of the energy storage member 262.

[0040] Preferably, the movable contact 222 includes at least two movable contact bridges 2220, each movable contact bridge 2220 is arranged on the contact support 221 in the second direction, and each movable contact bridge 2220 is provided with a movable contact point 2221 at one end, each movable contact point 2221 is spaced apart from the static contact point of the same contact mechanism in the first direction, and the thickness of the locking portion 2621 is greater than the width of one end of the movable contact bridge 2220 in the third direction, which increases the cooperation area of the movable contact bridge 2220 and the locking portion 2621 and improves the cooperation stability of the movable contact 222 and the energy storage member 262.

[0041] Preferably, the energy storage structure 26 further comprises a support 261, and the energy storage member 262 is rotatably arranged on the support 261, so that the energy storage structure 26 forms a modular structure as a whole, facilitating integrated assembly. Further, the support 261 has an accommodating cavity 2610 which is open towards the contact mechanism, and the energy storage member 262 is arranged in the accommodating cavity 2610, so as to provide a relatively closed rotating space for the energy storage member 262, avoiding interference of the energy storage member 262 with other components. The energy storage structure 26 further comprises a reset spring 263, and the energy storage member 262 is driven to reset by the reset spring 263, which is beneficial to maintaining the overall stability of the energy storage structure 26. The reset spring 263 can be a torsion spring which is coaxially rotatably arranged with the energy storage member 262, or can be a section of spring connected to the energy storage member 262.

[0042] In combination Figures 1-7 A specific embodiment of a change-over switch is provided.

[0043] As Figure 1 shown, the change-over switch comprises a housing 1, and a control pole (not shown) and a switch pole 2 are arranged in the housing 1. Preferably, the control pole and the switch pole 2 are arranged side by side in a third direction. The control pole can adopt the prior art, that is, the control pole comprises a circuit board, a motor and a gear set. The motor is connected to the circuit board, and a controller arranged on the circuit board outputs a control signal to drive the motor to start and stop. The gear set is connected to an output shaft of the motor, and is used to drive the switch pole 2 to perform opening and closing actions. The control pole and the switch pole 2 can be separated by a separation plate arranged in the housing 1, or the control pole and the switch pole 2 respectively have their own housings, and the control pole and the switch pole 2 are assembled together through the housings.

[0044] As Figure 1As shown, the switch pole 2 comprises terminal posts 20, which are divided into incoming terminal posts and outgoing terminal posts and are oppositely arranged in the second direction in the housing 1, and generally, the incoming terminal posts and the outgoing terminal posts are arranged in pairs; each switch pole 2 comprises two groups of contact mechanisms arranged in the first direction, and a rotating shaft 21 is rotatably arranged between the two groups of contact mechanisms, each group of contact mechanisms comprises a movable contact assembly 22 and a stationary contact group oppositely arranged in the first direction, and the movable contact assembly 22 is connected with the rotating shaft 21 through a linkage 24, and the movable contact assembly 22 is driven by the rotating shaft 21 to move in the first direction for cooperation with the stationary contact group, in the embodiment, the two groups of movable contact assemblies 22 are simultaneously driven by the rotating shaft 21 to move in the first direction, but the two groups of contact mechanisms cannot be simultaneously connected, that is, one group of movable contact assemblies 22 is in contact with one group of stationary contact groups, and the other group of movable contact assemblies 22 is separated from the other group of stationary contact groups; each group of contact mechanisms is further provided with an arc extinguishing system, and generally, the arc extinguishing system comprises an arc extinguishing chamber 28, which is arranged side by side with the contact mechanism in the first direction, and an arc inlet is arranged towards the contact mechanism for extinguishing the arc generated by the contact mechanism, so that the arc is conveniently introduced into the arc extinguishing chamber 28, and the arc extinguishing chamber 28 can adopt the prior art.

[0045] Specifically, each group of contact mechanisms comprises a movable contact assembly 22 and a stationary contact group, the movable contact assembly 22 comprises a contact support 221 and a movable contact 222 arranged on the contact support 221, and a contact spring 223 is arranged between the movable contact 222 and the contact support 221, and when the movable contact 222 and the contact support 221 move relatively in the first direction, the contact spring 223 is elastically deformed, and the elastic deformation of the contact spring 223 can provide contact pressure during closing.

[0046] In the embodiment, as shown in the figure, Figure 7 the contact support 221 comprises a block-shaped support body, a through slot serving as a mounting cavity 2210 is formed in the middle of the support body, the two side edges of the mounting cavity 2210 respectively extend outward in the second direction to form a protruding matching part 2212 and a pushing part 2216, the matching parts 2212 of the two contact supports 221 correspond to the same side in the housing 1, and the pushing parts 2216 of the two contact supports 221 also correspond to the same side in the housing 1, a partition plate 2213 is arranged in the mounting cavity 2210, and the mounting cavity 2210 is divided into two relatively independent contact cavities by the partition plate 2213; one end of the support body is provided with a hinged part 2211, a driving hole for hinging with the linkage 24 is arranged in the middle of the hinged part 2211, the other end of the support body is provided with a pair of spaced-apart baffles 2215, and the support body between the pair of baffles 2215 is provided with a protruding plug-in part 2214, which can be used for connecting a reset elastic member 25, so that the reset elastic member 25 and the linkage 24 jointly form a driving assembly connected to the movable contact assembly 22.

[0047] The moving contact 222 comprises at least one moving contact bridge 2220, which is arranged through the contact support 221 in the second direction, and in the first direction, the moving contact bridge 2220 is opposite to the pushing part 2216 (the cooperating part 2212) with a spacing, and in the second direction, the two ends of the moving contact bridge 2220 respectively exceed one pushing part 2216 (the cooperating part 2212) of the contact support 221, and the two ends of the moving contact bridge 2220 are respectively provided with one moving contact point 2221, preferably, the contact support 221 is provided with a mounting cavity 2210, the moving contact bridge 2220 is arranged through the mounting cavity 2210, and the two ends of the moving contact bridge 2220 are respectively extended outside the mounting cavity 2210,

[0048] The contact spring 223 is arranged in the mounting cavity 2210, and the two ends of the contact spring 223 are respectively in elastic abutment with the contact support 221 and the moving contact bridge 2220. Of course, two or more moving contact bridges 2220 can also be arranged in the mounting cavity 2210, and the two adjacent moving contact bridges 2220 are arranged side by side in the third direction, and further, the mounting cavity 2210 is provided with a partition plate 2213, and the two adjacent moving contact bridges 2220 are separated by the partition plate 2213, and each moving contact bridge 2220 is correspondingly provided with one contact spring 223.

[0049] In the embodiment, the stationary contact group comprises two stationary contacts 2323 arranged with a spacing in the second direction, each stationary contact 2323 is provided with a stationary contact point 232 cooperating with the moving contact point 2221, and the stationary contact point 232 and the moving contact point 2221 are opposite in the first direction with a spacing, and it should be noted that the number of stationary contact points 232 on each stationary contact 2323 can be matched with the number of moving contact points 2221, and when the number of moving contact bridges 2220 is two or more, the stationary contact 2323 can also be provided with only one stationary contact point 232 with a large area.

[0050] As shown in FIG. 1, Figures 1-6 At least one energy storage structure 26 is arranged in the switch, the energy storage structure 26 is located on one side of the moving contact assembly 22, Figure 1 Each group of contact mechanisms is provided with one energy storage structure 26, Figure 1 The energy storage structure 26 comprises a rotationally assembled energy storage piece 262, the energy storage piece 262 is provided with a locking part 2621 and an unlocking part 2622, wherein the thickness of the locking part 2621 in the third direction is greater than the width of one end of one moving contact bridge 2220, and when the number of moving contact bridges 2220 is two or more, 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 to the cooperation between the locking part 2621 and all moving contact bridges 2220.

[0051] In the closing movement of the movable contact assembly 22, the movable contact 222 is first locked and stopped in the closing movement by the locking part 2621 of the energy storage part 262, the contact support 221 continues to move in the closing direction under the drive of the rotating shaft 21, but 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, in this process, the relative movement between the movable contact 222 and the contact support 221 causes the elastic deformation of the contact spring 223, and with the closing movement of the contact support 221, the contact support 221 triggers the unlocking of the energy storage part 262, so that the movable contact 222 is unlocked from the energy storage part 262, and when the movable contact 222 is separated from the energy storage part 262, the contact spring 223 releases energy to drive the movable contact 222 to move the contact support 221 in the closing direction, that is, to quickly close the movable contact assembly 22 to the position.

[0052] In the embodiment, the energy storage structure 26 further comprises a reset spring 263, which drives the energy storage part 262 to reset, that is, when the energy storage part 262 is driven to rotate to the unlocking position, the reset spring 263 is pressed to store energy, that is, when the contact mechanism is closed to the position, the reset spring 263 is in the energy storage state, and when the energy storage part 262 is separated from the contact support 221, that is, in the opening movement of the movable contact assembly 22, when the contact support 221 is separated from the energy storage part 262, the reset spring 263 releases energy to drive the energy storage part 262 to reset; further, the energy storage part 262 is further provided with a bracket 261, and the energy storage part 262 is rotatably assembled on the bracket 261, so that the energy storage part 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 movable contact assembly 22.

[0053] In combination with Figures 1-3 and 6 provides a first energy storage structure 26 applied in the embodiment.

[0054] As Figures 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 Figures 4-6 A second energy storage structure 26 is provided for application in this embodiment.

[0056] like Figures 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 Figures 4-6As shown, the energy storage member 262 is similar to the energy storage member 262 in the first energy storage structure, and the energy storage member 262 includes a rotating part in a circular shaft shape, an axle hole is arranged in the middle part of the rotating part, the rotating part extends outward in the radial direction to form a rod-shaped unlocking part 2622, the other side of the rotating part extends outward to form a limiting arm in a straight rod shape, and a gap is left between the limiting arm and the unlocking part 2622, the extending length of the limiting arm is greater than the length of the unlocking part 2622, the end of the limiting arm is bent to form a hook-shaped locking part 2621 on the side where the unlocking part 2622 is arranged, and in this embodiment, the width of the limiting arm is greater than or equal to the width of the rotating part in the axial direction, so that the thickness of the locking part 2621 in the third direction is greater than or equal to the sum of the widths of the one ends of all the movable contact bridges 2220, which is beneficial to the limiting locking of the locking part 2621 and the one ends of all the movable contact bridges 2220 in the movable contact 222. A positioning part 2623 is arranged on the side of the limiting arm away from the unlocking part 2622, Figure 6 In this embodiment, the positioning part 2623 is a circular boss, when the positioning part 2623 cooperates with the positioning groove 2611 of the support 261, the energy storage member 262 stops rotating, thereby limiting the swing range thereof.

[0058] Of course, when the support 261 is a U-shaped body, the side wall of the accommodating cavity 2610 opposite to the opening and the limiting arm can cooperate to limit the swing range of the energy storage member 262, and 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 configured with the support 261, the positioning groove 2611 cooperating with the positioning part 2623 can be arranged on a fixed component in the housing 1.

[0059] In this structure, the reset spring 263 is a torsion spring, the reset spring 263 is coaxially arranged in the support 261 together with the energy storage member 262, one end of the reset spring 263 abuts against the accommodating cavity 2610, and the other end thereof elastically abuts against the energy storage member 262, so as to reset the energy storage member 262, in addition, the reset spring 263 can also be a section spring, in this case, the reset spring 263 can be connected between the positioning part 2623 and the accommodating cavity 2610. Figure 1 As shown, the rotating shaft 21 is rotatably arranged between the two groups of contact mechanisms, the rotating shaft 21 is arranged between the two groups of contact mechanisms in a rotating mode, the rotating axis of the rotating shaft 21 is parallel to the third direction, the rotating shaft 21 is connected with the hinged part 2211 of one contact support 221 through the linkage 24, the rotating shaft 21 can be a same body structure or a split structure, and in this embodiment, the rotating shaft 21 adopts the split structure, the rotating shaft 21 includes a driving shaft, two rotating discs are coaxially arranged on the driving shaft, each rotating disc is driven to rotate by the driving shaft, and each rotating disc is connected with one movable contact assembly 22 through the linkage 24.

[0060] Further, the reset elastic member 25 is also connected on each contact support 221, Figure 1 ,2 In the middle, the reset elastic element 25 is elastically connected between the plug portion 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 the embodiment, the arc extinguishing system matched with each group of contact mechanisms only comprises one arc extinguishing chamber 28, in the first direction, the arc extinguishing chamber 28 is arranged side by side with the adjacent contact structure, 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 piece 27 are located on the two sides of the same contact mechanism (the rotating shaft 21) respectively, the movable contact part at one end of each movable contact 222 is matched with one stationary contact 23 at the arc entrance of the arc extinguishing chamber 28 to open and close; in the second direction, the arc extinguishing chambers 28 of the two arc extinguishing systems are spaced apart from each other.

[0065] It should be noted that in the description of the utility model, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings or the orientation or positional relationship in use, and are only for the convenience of description, and do not indicate that the device or element referred to must have a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description, and cannot be understood as indicating relative importance.

[0066] The above is a further detailed description of the utility model in combination with a specific preferred embodiment, and the specific implementation of the utility model cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, a number of simple deductions or substitutions can be made without departing from the concept of the utility model, and all of them should be regarded as falling within the protection scope of the utility model.

Claims

1. A contact mechanism, comprising a moving contact assembly (22) and a stationary contact group, the moving contact assembly (22) moving along a straight line, the moving contact assembly (22) comprising a contact support (221) and a moving contact (222) arranged on the contact support (221), a contact spring (223) being arranged between the moving contact (222) and the contact support (221), the contact spring (223) being elastically deformed when the moving contact (222) and the contact support (221) move relative to each other, characterized in that at least one side of the moving contact assembly (22) is provided with an energy storage structure (26), the energy storage structure (26) comprising an energy storage member (262), during the closing movement of the moving contact assembly (22), the moving contact (222) is first locked and stopped by the energy storage member (262), the contact support (221) continues to move to trigger the movement of the energy storage member (262), so that the energy storage member (262) is unlocked from the moving contact assembly (22), and the moving contact assembly (22) after being unlocked from the energy storage member (262) is driven by the contact spring (223) to quickly close to the position.

2. The contact mechanism of claim 1, wherein: The energy storage member (262) is rotationally arranged, comprising a locking portion (2621) and an unlocking portion (2622), the moving contact (222) comprises at least one moving contact bridge (2220), the moving contact bridge (2220) is arranged through the contact support (221), one end of the moving contact bridge (2220) is in position cooperation with the locking portion (2621) to lock the moving contact (222), an edge of the contact support (221) is provided with a pushing portion (2216), the pushing portion (2216) pushes the unlocking portion (2622) to drive the energy storage member (262) to rotate and unlock the moving contact (222).

3. The contact mechanism of claim 2, wherein: 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 comprises two stationary contacts (2323) arranged in the second direction, a moving contact point (2221) at one end of each moving contact bridge (2220) is spaced apart from a stationary contact point (232) of each stationary contact (2323) in the first direction, and in the third direction, the thickness of the locking portion (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 of claim 1, wherein: The energy storage structure (26) further comprises a reset spring (263) for driving the energy storage member (262) to reset.

5. The contact mechanism of claim 4, wherein: The reset spring (263) is coaxially rotationally arranged with the energy storage member (262), one end of the reset spring (263) is in elastic abutment with the energy storage member (262); or the reset spring (263) is connected to a side of the energy storage member (262) opposite to the contact mechanism.

6. The contact mechanism of claim 1, wherein: The energy storage member (262) is provided with a positioning portion (2623) for limiting the rotation range of the energy storage member (262), the positioning portion (2623) is located at a side of the energy storage member (262) opposite to the moving contact assembly (22).

7. The contact mechanism of any one of claims 1-6, wherein: The energy storage structure (26) further comprises a support (261), and the energy storage member (262) is rotatably arranged on the support (261).

8. The contact mechanism of claim 7, wherein: The support (261) comprises an accommodating cavity (2610) which is open to the contact mechanism, and the energy storage member (262) is rotatably arranged in the accommodating cavity (2610).

9. The contact mechanism of claim 1, wherein: The energy storage member (262) comprises a rotating part, a shaft hole is arranged in the middle of the rotating part, the rotating part extends in the radial direction to form a rod-shaped unlocking part (2622) close to the contact support direction, the rotating part extends to the moving direction of the movable contact (222) to form a limiting arm, the end of the limiting arm is bent to form a hook-shaped locking part (2621) close to the movable contact (222), and a protruding positioning part (2623) is arranged on the side of the limiting arm which is opposite to the locking part (2621).

10. A change-over switch comprising a housing (1) and a switching pole (2) arranged in the housing (1), the switching pole (2) comprising two sets of contact mechanisms, characterized in that: At least one set of the contact mechanism is the contact mechanism according to any one of claims 1-9.

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