Variable gap structure and switching device

Abstract

A variable-pitch structure includes a contact support, a reaction spring, and a contact system. It also includes at least one buffer mechanism, which comprises a limiting member and a buffer spring. The contact support has a buffer groove, and the limiting member confines the buffer spring within the buffer groove. The limiting member has a protruding portion, which is driven by the buffer spring to extend beyond the buffer groove. When the contact support moves the moving contact away from the stationary contact, a stop portion blocks the protruding portion, allowing the protruding portion to overcome the force of the buffer spring and move back into the buffer groove. A switching device includes a housing, an electromagnetic system, and a variable-pitch structure. The variable-pitch structure and switching device of this application increase the variable pitch by confining the buffer spring within the buffer groove of the contact support using a limiting member. This increases the breaking distance of the switching device during a short circuit, thereby improving its breaking capacity. Simultaneously, it does not increase the opening distance during closing operations, enabling rapid closing. Furthermore, the buffer mechanism and contact support are integrated into one unit.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a variable opening distance structure and a switching device. Background Technology

[0002] Switchgear typically incorporates a contact system, which connects and disconnects circuits by the opening and closing of the moving and stationary contacts. To ensure rapid opening and closing of the moving and stationary contacts, the distance between them is generally not designed to be too large. However, a small distance can negatively impact breaking capacity, especially during short-circuit surges, potentially leading to arc reignition. Utility Model Content

[0003] The purpose of this invention is to overcome at least one defect of the prior art and to provide a variable opening distance structure and a switching device.

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

[0005] A variable gap structure includes a contact support, a reaction spring, and a contact system disposed within a housing. The contact system includes a moving contact and a stationary contact disposed opposite to each other. The moving contact is disposed on the contact support. The reaction spring drives the contact support to move the moving contact linearly away from the stationary contact. The variable gap structure also includes at least one buffer mechanism disposed on the contact support. The buffer mechanism includes a limiting member and a buffer spring. The contact support has a buffer groove. The buffer spring and the limiting member are installed in the buffer groove. The limiting member confines the buffer spring within the buffer groove and has a protruding portion. The buffer spring drives the limiting member to extend the protruding portion out of the buffer groove. The housing has a stop portion corresponding to the protruding portion. When the contact support moves the moving contact away from the stationary contact, the stop portion blocks the protruding portion. The protruding portion can overcome the force of the buffer spring and move back into the buffer groove.

[0006] Optionally, when the stop portion blocks the protrusion and the force of the reaction spring acting on the contact support is equal to the force of the buffer spring acting on the stop portion, the protrusion will not retract into the buffer groove. At this time, the distance between the moving contact and the stationary contact is the first opening distance. When at least part of the protrusion retracts into the buffer groove, the distance between the moving contact and the stationary contact is the second opening distance, which is greater than the first opening distance.

[0007] Optionally, the contact support has a through hole structure, and a sealing plate is mounted on the bottom side of the contact support, the sealing plate closing the bottom opening of the through hole structure to form the buffer groove.

[0008] Optionally, the limiting member is provided with a limiting protrusion, and the side wall of the buffer groove is provided with a blocking protrusion. The blocking protrusion and the limiting protrusion cooperate to limit the limiting member to prevent it from coming out of the buffer groove.

[0009] Optionally, the contact support includes a contact support base plate and at least one support structure for mounting the moving contact. The support structure and the buffer groove are respectively disposed on the top side of the contact support base plate, and the reaction spring is disposed on the bottom side of the contact support base plate.

[0010] Optionally, the top side of the contact support base plate is provided with a plurality of support structures arranged at intervals, the contact support base plate is provided with a buffer groove on both sides of the gap between every two adjacent support structures, and the bottom side of the contact support base plate is provided with a plurality of reaction springs arranged at intervals.

[0011] Optionally, the contact support includes a contact support base plate and at least one support structure for mounting the moving contact.

[0012] The support structure for the contact support is internally equipped with a contact spring and a clamping structure connected to the contact spring. The clamping structure extends to the outside of the support structure to push the moving contact. The contact spring, through the clamping structure, causes the moving contact to be pressed against the upper limit of the outer surface of the support structure. When the contact support causes the moving contact to contact the stationary contact, because the moving contact is pressed against the upper limit of the support structure for the contact support, the contact support moves and compresses the contact spring. The contact spring, through the clamping structure, causes the moving contact to be pressed against the upper limit of the stationary contact.

[0013] Optionally, the support structure for the contact support includes two first side plates disposed opposite to each other, and two second side plates connected between the two first side plates. The two first side plates and the two second side plates are connected by a top plate, forming a support space between the two first side plates, the two second side plates and the top plate for accommodating the clamping structure and the contact spring.

[0014] The clamping structure is U-shaped and includes two opposing spring bracket sides and a spring bracket bottom connected between the two spring bracket sides. The contact spring is located between the bottom of the spring bracket and the inner side of the top plate and abuts against the bottom of the spring bracket and the inner side of the top plate, respectively. The two first side plates are respectively set higher than the top plate. Sliding grooves are provided on the opposing sides of the two first side plates. The two spring bracket sides are slidably engaged in the sliding grooves. The ends of the two spring bracket sides away from the bottom of the spring bracket extend from the sliding grooves to the outer side of the top plate. The ends of the two spring bracket sides located on the outer side of the top plate are respectively connected to the pressure rod. The moving contact is located between the pressure rod and the outer side of the top plate. The pressure rod is used to press the moving contact onto the top plate. A limiting groove that cooperates with the pressure rod is provided on the moving contact.

[0015] A switching device includes a housing and an electromagnetic system disposed within the housing. The electromagnetic system includes an upper armature and a coil for driving the upper armature to move. The switching device also includes a variable opening distance structure as described in any one of the claims. The upper armature of the electromagnetic system drives the contact support to move linearly against the force of the return spring, so that the contact support drives the moving contact to contact the stationary contact. The contact support, under the action of the return spring, drives the moving contact to separate from the stationary contact.

[0016] Optionally, the housing is provided with two electromagnetic systems, which are arranged opposite each other on both sides of the contact system. The upper armatures of the two electromagnetic systems are connected by a linkage shaft, and the linkage shaft is connected to the contact support.

[0017] The variable opening distance structure and switchgear of this utility model limit the buffer spring within the buffer groove of the contact support through the limiting component of the buffer mechanism, thereby increasing the variable opening distance and improving the breaking capacity of the switchgear during short circuits. At the same time, it does not increase the opening distance during closing operations, enabling rapid closing. Furthermore, the buffer mechanism and contact support are integrated into one unit, which is conducive to miniaturization and modular design, easy installation, compact setting, and reduced size.

[0018] In addition, the reaction spring, moving contact, and buffer mechanism are arranged reasonably and compactly on the contact support, making the contact support more evenly and stably stressed. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the switching device of this utility model in the energized state;

[0020] Figure 2 This is a cross-sectional view of the switching device under short circuit conditions of this utility model, showing the maximum contact opening distance;

[0021] Figure 3 This is an assembly drawing of the contact support, moving contact, and buffer mechanism of this utility model;

[0022] Figure 4 This is an exploded view of the contact support, moving contact, and buffer mechanism of this utility model;

[0023] Figure 5 This is a cross-sectional view of the switching device under power-off conditions, showing the electromagnetic system and contact support;

[0024] Figure 6 This is a schematic diagram of the electromagnetic system and contact support of this utility model;

[0025] Figure 7 This is an assembly drawing of the switch electrical appliance of this utility model.

[0026] Figure 8This is an exploded view of the switch electrical appliance of this utility model.

[0027] Contact support 1; Contact spring 10; Contact support base plate 11; Buffer groove 111; Blocking protrusion 112; First reinforcing plate 113; Second reinforcing plate 114; Sealing plate 12; First side plate 13; Slide groove 131; Fixing groove 132; Second side plate 14; Top plate 15; Linkage bracket 16; Linkage groove 161; Fixing protrusion 162; Contact heat insulation plate 17; Heat dissipation groove 171; Limiting flange 172; Reaction spring 2; Contact system 300; Moving contact 3; Limiting groove 31; Static Contact 4; Buffer mechanism 5; Limiting element 51; Extension 511; Spring limiting groove; Limiting protrusion 512; Buffer spring 52; Pressing structure 6; Spring bracket side 61; Spring bracket bottom 62; Pressure rod 63; Base 71; Stop part 711; Arc extinguishing cover 72; Top cover 73; Boss structure 74; Groove structure 75; Side cover 76; Electromagnetic system 8; Linkage shaft 80; Upper armature 81; Horizontal part 811; Vertical part 812; Coil 82; Lower armature 83; Coil frame 84. Detailed Implementation

[0028] The following embodiments, in conjunction with the accompanying drawings, further illustrate the specific implementation of the variable opening distance structure and switching device of this utility model. The variable opening distance structure and switching device of this utility model are not limited to the descriptions in the following embodiments.

[0029] like Figure 1 , Figure 5 and Figure 8 As shown, the switching device of this embodiment includes a housing and an electromagnetic system 8 and a contact system 300 disposed within the housing. The electromagnetic system 8 includes an upper armature 81 and a coil 82 for driving the upper armature 81 to move. The contact system 300 includes a moving contact 3 and a stationary contact 4 disposed opposite to each other. The moving contact 3 is disposed on a contact support 1, which is linearly movable within the housing. The upper armature 81 is connected to the contact support 1 and is used to drive the contact support 1 to move the moving contact 3 towards the stationary contact 4. A return spring 2 is connected to the contact support 1 and is used to drive the contact support 1 to reset, that is, the contact support 1 drives the moving contact 3 to move away from the stationary contact 4. Figure 1 As shown, when coil 82 is energized, the upper armature 81 of the electromagnetic system 8, driven by electromagnetic force, drives the contact support 1 to move downward against the force of the reaction spring 2, causing the contact support 1 to drive the moving contact 3 to contact the stationary contact 4; Reference Figure 2 When the coil 82 is de-energized, the upper armature 81 of the electromagnetic system 8 moves upward, and the contact support 1, under the action of the reaction spring 2, causes the moving contact 3 to separate from the stationary contact 4.

[0030] like Figure 3-4As shown, the improvement of this application is that the switching device further includes a variable opening distance structure. The variable opening distance structure includes a contact support 1, a reaction spring 2, a contact system 300, and at least one buffer mechanism 5. The buffer mechanism 5 is mounted on the contact support 1. The buffer mechanism 5 includes a limiting member 51 and a buffer spring 52. A buffer groove 111 is provided on the contact support 1. The limiting member 51 and the buffer spring 52 are installed in the buffer groove 111. The limiting member 51 confines the buffer spring 52 within the buffer groove 111, and the limiting member 51 has a protruding portion. 511, the buffer spring 52 drives the limiting member 51 to extend the protrusion 511 out of the buffer groove 111; the housing is provided with a stop 711 corresponding to the protrusion 511. The stop 711 is located on the movement path of the protrusion 511 when the contact support 1 drives the moving contact 3 to move away from the stationary contact 4. When the contact support 1 drives the moving contact 3 to move away from the stationary contact 4, the stop 711 blocks the protrusion 511. The protrusion 511 can overcome the force of the buffer spring 52 and move in the direction of retracting into the buffer groove 111.

[0031] By adopting the above structure, when the moving contact 3 separates from the stationary contact 4, if the force driving the moving contact 3 to separate is different, the distance by which the compressed extension 511 retracts into the buffer groove 111 (i.e., the compression distance of the buffer spring 52) will be different, thus the opening distance between the moving contact 3 and the stationary contact 4 is variable. For example, when the switchgear is normally open, when the contact support 1 drives the moving contact 3 to separate from the stationary contact 4 under the action of the reaction spring 2, the extension 511 of the limiting member 51 just contacts the stop part 711. At this time, since the contact support 1 is balanced under the opposite action of the reaction spring 2 and the buffer spring 52, that is, the force of the reaction spring 2 acting on the contact support 1 is equal to the force of the buffer spring 52 acting on the stop part 711, the extension 511 will not retract into the buffer groove 111 or will retract slightly into the buffer groove 111. When the circuit breaker trips during a short circuit fault, the contact support 1, under the action of the reaction spring 2 and the electric repulsion force, causes the moving contact 3 to separate from the stationary contact 4. The stop part 711 blocks the protruding part 511, which can cause part or all of the protruding part 511 to retract into the buffer groove 111.

[0032] refer to Figure 2When the switchgear is normally open, the coil 82 is de-energized, the upper armature 81 of the electromagnetic system 8 loses its electromagnetic force, and the contact support 1, under the action of the reaction spring 2, drives the moving contact 3 to move upward, separating the moving contact 3 from the stationary contact 4. Simultaneously, the contact support 1 drives the buffer mechanism 5 to move towards the stop 711, and the protruding part 511 of the limiting member 51 just contacts the stop 711. At this time, the coil 82 enters the de-energized state. Because the contact support 1 remains balanced under the opposite action of the reaction spring 2 and the buffer spring 52, i.e., the reaction spring... 2. The force acting on the contact support 1 is equal to the force acting on the stop 711 by the buffer spring 52, so the extension 511 of the limiting member 51 will not retract into the buffer groove 111 or will retract slightly into the buffer groove 111. At this time, the distance between the moving contact 3 and the stationary contact 4 is the first opening distance, also known as the balanced opening distance. When the first opening distance is small, the opening distance between the moving contact 3 and the stationary contact 4 is relatively small. When performing the closing operation, the electromagnetic system 8 only needs to drive the contact support 1 to move downward by the first opening distance to achieve closing, thus realizing the rapid closing of the switchgear.

[0033] like Figure 1 As shown, when the switch is closed, the coil 82 is energized. Under the drive of electromagnetic force, the upper armature 81 of the electromagnetic system 8 drives the contact support 1 to move downward against the force of the reaction spring 2, so that the contact support 1 drives the moving contact 3 to contact the stationary contact 4. The contact support 1 simultaneously drives the buffer mechanism 5 to move away from the stop part 711, and the extension part 511 of the limiting member 51 separates from the stop part 711.

[0034] like Figure 2 As shown, when a short circuit fault occurs in the switching device, a huge short-circuit current flows through the moving contact 3 and the stationary contact 4, generating an electric repulsive force. This causes the moving contact 3 to move rapidly upwards and separate from the stationary contact 4. At this time, the electromagnetic system 8 also loses power, and the reaction spring 2 drives the contact support 1 to move the moving contact 3 upwards. The buffer mechanism 5 moves with the contact support 1 towards the stop 711, causing the extension 511 of the limiting member 51 to contact the stop 711. Under the combined action of the electric repulsive force and the reaction spring 2, the limiting member... The protruding part 511 of the stop member 51, under the blocking action of the stop part 711, overcomes the force of the buffer spring 52 and retracts partially or completely into the buffer groove 111. At this time, the distance between the moving contact 3 and the stationary contact 4 is the second opening distance. The opening distance between the moving contact 3 and the stationary contact 4 is the largest when the protruding part 511 of the stop member 51 is completely retracted into the buffer groove 111, that is, when the contact support 1 can no longer move upward. The second opening distance is equal to the first opening distance plus the compression distance of the buffer spring 52. This can increase the opening distance of the switchgear during short circuit and reduce the risk of arc reignition. After the electric repulsion disappears, the reaction spring 2 and the buffer spring 52 return to the equilibrium state, and the distance between the moving contact 3 and the stationary contact 4 returns to the first opening distance.

[0035] The variable opening distance structure and switchgear of this embodiment limit the buffer spring 52 within the buffer groove 111 of the contact support 1 through the limiting member 51 of the buffer mechanism 5, thereby increasing the variable opening distance (i.e., the compression distance of the buffer spring 52 of the buffer mechanism 5), thereby improving the breaking distance of the switchgear during short circuit to enhance its breaking capacity, while not increasing the opening distance during closing operation, enabling rapid closing. Furthermore, the buffer mechanism 5 and the contact support 1 are integrated into one unit, which is conducive to miniaturization and modular design, easy installation, compact setting, and reduced size.

[0036] like Figure 3-5 As shown, the contact support 1 in this embodiment includes a contact support base plate 11 and at least one support structure for mounting the moving contact 3. The support structure and the buffer groove 111 for accommodating the buffer mechanism 5 are respectively disposed on the top side of the contact support base plate 11. The reaction spring 2 is disposed on the bottom side of the contact support base plate 11. A spring limiting boss is provided on the bottom side of the contact support base plate 11. The spring limiting boss is annular. One end of the reaction spring 2 abuts against the spring limiting boss, and the other end abuts against the housing.

[0037] Specifically, the contact support base plate 11 has a protrusion at the center of its top side with multiple support structures arranged at intervals. Each support structure has a moving contact 3. The contact support base plate 11 has a buffer groove 111 on both sides of the gap between every two adjacent support structures. Correspondingly, each buffer groove 111 contains a buffer mechanism 5. The moving contact 3 and the buffer mechanism 5 are positioned near the center of the contact support base plate 11. The bottom side of the contact support base plate 11 has multiple reaction springs 2 arranged at intervals on both sides, with the reaction springs 2 positioned near the edge of the contact support base plate 11. In this embodiment, the contact support base plate 11 has a first reinforcing plate 113 connected to the outer wall of the support structure, and a second reinforcing plate 114 connected between two adjacent support structures. The reaction springs 2, moving contacts 3, and buffer mechanisms 5 are reasonably and compactly arranged on the contact support 1, making the contact support 1 more evenly and stably stressed.

[0038] like Figure 1-4As shown, the contact support base plate 11 of the contact support 1 has a through-hole structure. A sealing plate 12 is mounted on the bottom side of the contact support base plate 11. The sealing plate 12 closes the bottom opening of the through-hole structure to form the buffer groove 111, that is, the sealing plate 12 serves as the bottom wall of the buffer groove 111. The limiting member 51 and the buffer spring 52 are inserted into the buffer groove 111 from the side where the sealing plate 12 is installed. Then, the sealing plate 12 is fixedly connected to the contact support 1, and the buffer mechanism 5 is installed in the buffer groove 111. The sealing plate 12 is a straight plate structure made of steel or other materials. The sealing plate 12, which serves as the bottom wall of the buffer groove 111, is detachably connected to the contact support 1, which facilitates the limiting member 51 to be limited and installed in the buffer groove 111. The sealing plate 12 and the contact support 1 can be connected by fasteners, snap-fit, or other connection methods. Of course, the sealing plate 12 can also be integrally connected to the contact support 1, that is, the contact support 1 directly has a buffer groove 111 with a bottom wall.

[0039] Preferably, the limiting member 51 is provided with a limiting protrusion 512, and the side wall of the buffer groove 111 is provided with a blocking protrusion 112. The blocking protrusion 112 and the limiting protrusion 512 cooperate to limit the limiting member 51 from falling out of the buffer groove 111. The limiting member 51 is preferably a cylindrical structure, but it can also be a square or other shaped column structure. The top of the limiting member 51 is a protruding part 511, and the bottom of the limiting member 51 has a radially protruding annular limiting protrusion 512. Correspondingly, the buffer groove 111 is a circular groove, and the top opening of the side wall of the buffer groove 111 has an annular blocking protrusion 112.

[0040] Preferably, a spring limiting groove is provided on the bottom side of the limiting member 51 of the buffer mechanism 5. One end of the buffer spring 52 abuts against the spring limiting groove, and the other end abuts against the bottom wall of the buffer groove 111, so that the limiting member 51 and the buffer spring 52 of the buffer mechanism 5 are more compactly arranged, reducing the size of the buffer mechanism 5. The buffer spring 52 is preferably a compression spring, but it can also be a tension spring, leaf spring, etc.

[0041] like Figure 3-5 As shown, in one embodiment of the mating structure between the contact support 1 and the moving contact 3, the support structure of the contact support 1 is provided with a contact spring 10 and a clamping structure 6 connected to the contact spring 10. The clamping structure 6 extends to the outside of the support structure to push the moving contact 3. The contact spring 10 drives the moving contact 3 to be pressed against the upper limit of the outer side of the support structure through the clamping structure 6. When the contact support 1 drives the moving contact 3 to contact the stationary contact 4, since the moving contact 3 is pressed against the upper limit of the support structure of the contact support 1, the contact support 1 moves and compresses the contact spring 10. The contact spring 10 drives the moving contact 3 to be pressed against the upper limit of the stationary contact 4 through the clamping structure 6, thereby increasing the contact pressure between the stationary contact 4 and the moving contact 3.

[0042] Specifically, the support structure of the contact support 1 is a hollow tetrahedral structure, including two opposing first side plates 13 and two second side plates 14 connected between the two first side plates 13. The two first side plates 13 and the two second side plates 14 are connected by a top plate 15, forming a support space between the two first side plates 13, the two second side plates 14 and the top plate 15 to accommodate the clamping structure 6 and the contact spring 10. The contact support base plate 11 is provided with an installation inlet communicating with the support space. The clamping structure 6 has a U-shaped structure and includes two opposing spring support sides 61 and a spring support bottom 62 connected between the two spring support sides 61. The contact spring 10 is disposed at the spring support bottom 62. The two first side plates 13 are positioned above the top plate 15 and respectively abut against the bottom 62 of the spring bracket and the inner side of the top plate 15. Each of the two first side plates 13 has a sliding groove 131 on its facing sides. The two spring bracket sides 61 are slidably engaged within the sliding grooves 131. The ends of the two spring bracket sides 61 away from the bottom 62 extend from the sliding grooves 131 to the outer side of the top plate 15. The ends of the two spring bracket sides 61 on the outer side of the top plate 15 are connected to the pressure rod 63. The moving contact 3 is positioned between the pressure rod 63 and the outer side of the top plate 15. The pressure rod 63 presses the moving contact 3 against the top plate 15. The moving contact 3 has a limiting groove 31 that mates with the pressure rod 63. Alternatively, the pressing structure 6 can also take other shapes.

[0043] Furthermore, a heat insulation plate 17 is provided between the moving contact 3 and the top plate 15 of the contact support 1 to prevent the moving contact 3 from directly contacting the contact support 1 and to prevent the moving contact 3 from overheating and damaging the contact support 1. Specifically, a heat dissipation groove 171 is provided on the top side of the heat insulation plate 17. The heat insulation plate 17 is preferably a straight plate structure, and both ends of the heat insulation plate 17 are respectively provided with limiting flanges 172 that cooperate with the limiting flanges 172 of the top plate 15. The top plate 15 is located between the two limiting flanges 172 of the heat insulation plate 17.

[0044] refer to Figure 3-5 Another embodiment of the mating structure between the contact support 1 and the moving contact 3 (not shown in the figure) is that the moving contact 3 passes through the contact support 1, and the contact support 1 is provided with a through cavity for accommodating the moving contact 3 and the contact spring 10. The moving contact 3 is disposed in the through cavity, and its two ends extend out of the through cavity to mate with the stationary contact 4. One end of the contact spring 10 abuts against the moving contact 3, and the other end abuts against the side wall of the through cavity.

[0045] like Figure 6 and Figure 8As shown, two electromagnetic systems 8 are provided inside the housing. The two electromagnetic systems 8 are arranged opposite each other on both sides of the contact system 300. The upper armatures 81 of the two electromagnetic systems 8 are connected by a linkage shaft 80. The linkage shaft 80 is connected to the contact support 1. The two electromagnetic systems 8 drive the contact support 1 to move against the force of the reaction spring 2 through the linkage shaft 80, so that the contact support 1 drives the moving contact 3 to contact the stationary contact 4.

[0046] Optionally, the top side of the contact support 1 is provided with a linkage bracket 16. The top side of the linkage bracket 16 is provided with a linkage groove 161 that mates with the linkage shaft 80. The linkage bracket 16 is detachably connected to the contact support 1. The linkage bracket 16 is provided with a fixing protrusion 162. The top side of the first side plate 13 of the contact support 1 is provided with a fixing groove 132. The linkage bracket 16 is fixed to the top side of the first side plate 13 by inserting the fixing protrusion 162 into the fixing groove 132. The linkage bracket 16 can also be integrally connected to the contact support 1. The connection between the linkage bracket 16 and the contact support 1 can also be a fastener connection, a snap-fit ​​connection, or other connection methods. Of course, as another embodiment, the linkage bracket 16 may not be provided, and the linkage shaft 80 may directly pass through the position between the moving contact 3 and the contact spring 10 on the contact support 1. That is, the first side plate 13 of the contact support 1 and the spring bracket side 61 of the pressing structure 6 are respectively provided with linkage shaft through holes for the linkage shaft 80 to pass through. The linkage shaft through holes are elongated and the length direction is set along the moving direction of the contact support 1.

[0047] like Figure 5 and Figure 6As shown, the electromagnetic system 8 of this embodiment also includes a fixedly disposed lower armature 83, an upper armature 81 disposed opposite to the lower armature 83, a coil frame 84 disposed between the upper armature 81 and the lower armature 83, and a coil 82 disposed outside the coil frame 84. The coil 82 is used to generate electromagnetic force to drive the upper armature 81 to move in the direction of the lower armature 83. Specifically, the upper armature 81 is T-shaped and includes a transverse portion 811 and a longitudinal portion 812 connected to the middle of the transverse portion 811. A linkage hole is provided at the connection between the transverse portion 811 and the longitudinal portion 812. The two ends of the linkage shaft 80 are respectively inserted into the linkage holes of the upper armatures 81 of the two electromagnetic systems 8, so that the two upper armatures 81 can drive the linkage shaft 80 to move. The longitudinal portion 812 is inserted into the inner side of the coil frame 84. The lower armature 83 is used to attract the longitudinal portion 812, so that the longitudinal portion 812 drives the upper armature 81 to move. The two ends of the transverse portion 811 are respectively connected to a return spring (not shown in the figure), which is used to drive the upper armature 81 to reset. Of course, as another embodiment, the return spring may not be provided. When the coil 82 is de-energized, the contact support 1 drives the moving contact 3 to separate from the stationary contact 4 under the action of the reaction spring 2. At the same time, the contact support 1 drives the upper armatures 81 of the two electromagnetic systems 8 to reset through the linkage shaft 80.

[0048] like Figure 7 and Figure 8As shown, the housing in this embodiment includes a base 71 and an arc-extinguishing cover 72 disposed on the top side of the base 71. A top cover 73 is provided above the arc-extinguishing cover 72. The contact system 300 is disposed inside the arc-extinguishing cover 72 and the base 71. An arc-extinguishing mechanism is provided in the arc-extinguishing cover 72. Two protruding boss structures 74 are provided on the top side of the base 71. The middle part of the two boss structures 74 is respectively provided with a groove structure 75 for accommodating the electromagnetic system 8. The electromagnetic system 8 is installed in the groove structure 75. Preferably, the groove structure 75 has a notch near the side wall of the housing, and the housing has a side cover 76 corresponding to the notch, which is used to protect the electromagnetic system 8 and also facilitates the replacement of the electromagnetic system 8. In this embodiment, the side cover 76 is L-shaped, with one end of the side cover 76 closing the top of the groove structure 75, and both sides of one end of the side cover 76 extending outward to form a fixing part that covers the top side of the boss structure 74. The fixing part of the side cover 76 is fastened to the boss structure 74 or connected by other means. The other end of the side cover 76 closes the side notch of the groove structure 75. The two boss structures 74 are arranged opposite each other on both sides of the arc-extinguishing cover 72, and the height of the boss structure 74 is preferably equal to the height of the arc-extinguishing cover 72, so that the top side of the fixing part of the side cover 76 is flush with the top cover 73, making the shape of the switch more regular. Of course, the height of the boss structure 74 can also be less than or greater than the height of the arc-extinguishing cover 72. Furthermore, a bottom cover is provided on the bottom side of the base 71, and the reaction spring 2 is connected to the contact support 1 and located between the base 71 and the bottom cover. Of course, as other embodiments, the housing may only have a base and a top cover, or a left shell and a right shell, or may be assembled from more housing structures.

[0049] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0050] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A variable gap structure, comprising a contact support (1), a reaction spring (2), and a contact system (300) disposed within a housing, the contact system (300) comprising a moving contact (3) and a stationary contact (4) disposed opposite to each other, the moving contact (3) being disposed on the contact support (1), and the reaction spring (2) being used to drive the contact support (1) to move the moving contact (3) linearly away from the stationary contact (4), characterized in that: The variable opening distance structure further includes at least one buffer mechanism (5) disposed on the contact support (1). The buffer mechanism (5) includes a limiting member (51) and a buffer spring (52). The contact support (1) is provided with a buffer groove (111). The buffer spring (52) and the limiting member (51) are installed in the buffer groove (111). The limiting member (51) limits the buffer spring (52) within the buffer groove (111), and the limiting member (51) is provided with a protrusion (511). The buffer spring (52) drives the limiting member (51) to extend the protrusion (511) out of the buffer groove (111). The housing is provided with a stop (711) corresponding to the protrusion (511). When the contact support (1) drives the moving contact (3) to move away from the stationary contact (4), the stop (711) blocks the protrusion (511). The protrusion (511) can overcome the force of the buffer spring (52) and move in the direction of retracting into the buffer groove (111).

2. The variable pitch structure of claim 1, wherein: When the stop (711) blocks the protrusion (511), and the force of the reaction spring (2) acting on the contact support (1) is equal to the force of the buffer spring (52) acting on the stop (711), the protrusion (511) will not retract into the buffer groove (111). At this time, the distance between the moving contact (3) and the stationary contact (4) is the first opening distance. When at least part of the protrusion (511) retracts into the buffer groove (111), the distance between the moving contact (3) and the stationary contact (4) is the second opening distance, which is greater than the first opening distance.

3. The variable pitch structure of claim 1, wherein: The contact support (1) has a through hole structure, and a sealing plate (12) is mounted on the bottom side of the contact support (1). The sealing plate (12) closes the bottom opening of the through hole structure to form the buffer groove (111).

4. The variable pitch structure of claim 1, wherein: The limiting member (51) is provided with a limiting protrusion (512), and the side wall of the buffer groove (111) is provided with a blocking protrusion (112). The blocking protrusion (112) and the limiting protrusion (512) cooperate to limit the limiting member (51) from coming out of the buffer groove (111).

5. The variable pitch structure of claim 1, wherein: The contact support (1) includes a contact support base plate (11) and at least one support structure for mounting the moving contact (3). The support structure and the buffer groove (111) are respectively disposed on the top side of the contact support base plate (11), and the reaction spring (2) is disposed on the bottom side of the contact support base plate (11).

6. The variable pitch structure of claim 5, wherein: The top side of the contact support base plate (11) is provided with a plurality of support structures arranged at intervals. The contact support base plate (11) is provided with a buffer groove (111) on both sides of the gap between every two adjacent support structures. The bottom side of the contact support base plate (11) is provided with a plurality of reaction springs (2) arranged at intervals.

7. The variable pitch structure of claim 1, wherein: The contact support (1) includes a contact support base plate (11) and at least one support structure for mounting the moving contact (3). The contact support (1) has a contact spring (10) and a clamping structure (6) connected to the contact spring (10) inside its support structure. The clamping structure (6) extends to the outside of the support structure to push the moving contact (3). The contact spring (10) drives the moving contact (3) to press against the upper limit of the outer side of the support structure through the clamping structure (6). When the contact support (1) drives the moving contact (3) to contact the stationary contact (4), the moving contact (3) is pressed against the upper limit of the support structure of the contact support (1). The contact support (1) moves and compresses the contact spring (10). The contact spring (10) drives the moving contact (3) to press against the upper limit of the stationary contact (4) through the clamping structure (6).

8. The variable pitch structure of claim 7, wherein: The support structure of the contact support (1) includes two first side plates (13) arranged opposite to each other, and two second side plates (14) connected between the two first side plates (13). The two first side plates (13) and the two second side plates (14) are connected by a top plate (15). A support space for accommodating the clamping structure (6) and the contact spring (10) is formed between the two first side plates (13), the two second side plates (14) and the top plate (15). The clamping structure (6) has a U-shaped structure. The clamping structure (6) includes two opposing spring bracket sides (61) and a spring bracket bottom (62) connected between the two spring bracket sides (61). The contact spring (10) is disposed between the spring bracket bottom (62) and the inner side of the top plate (15) and abuts against the inner side of the spring bracket bottom (62) and the top plate (15) respectively. The two first side plates (13) are respectively set higher than the top plate (15). Slide grooves (131) are respectively provided on the opposing sides of the two first side plates (13). The two spring brackets The side edges (61) of the frame are respectively located in the sliding groove (131) for sliding fit. The ends of the two spring brackets (61) away from the bottom (62) of the spring bracket extend from the sliding groove (131) to the outside of the top plate (15). The ends of the two spring brackets (61) located on the outside of the top plate (15) are respectively connected to the pressure rod (63). The moving contact (3) is set between the pressure rod (63) and the outer side of the top plate (15). The pressure rod (63) is used to press the moving contact (3) on the top plate (15). The moving contact (3) is provided with a limiting groove (31) that cooperates with the pressure rod (63).

9. Switched electrical apparatus comprising a housing and an electromagnetic system (8) arranged in the housing, the electromagnetic system (8) comprising an upper armature (81) and a coil (82) for driving the upper armature (81) to move, characterized in that: The switching device further includes the variable opening distance structure according to any one of claims 1-8, wherein the upper armature (81) of the electromagnetic system (8) drives the contact support (1) to move linearly against the force of the reaction spring (2), so that the contact support (1) drives the moving contact (3) to contact the stationary contact (4); the contact support (1) drives the moving contact (3) to separate from the stationary contact (4) under the action of the reaction spring (2).

10. The switchgear according to claim 9, characterized in that: Two electromagnetic systems (8) are arranged in the shell, and oppositely arranged on two sides of the contact system (300), and the upper armatures (81) of the two electromagnetic systems (8) are connected through a linkage shaft (80), and the linkage shaft (80) is connected with the contact support (1).

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