Built-in switch

Abstract

The built-in switch comprises a shell, an electromagnetic operating system and at least one contact unit are arranged in the shell, the contact unit comprises a wiring terminal and a contact mechanism, the contact mechanism comprises a moving contact assembly and a static contact which are matched with each other, the moving contact assembly comprises a contact support and a moving contact connected to the contact support, and the static contact is connected to the moving contact. The electromagnetic operating system is opposite to the adjacent contact supports in the first direction, the electromagnetic operating system drives the contact supports to rotate, the electromagnetic operating system, the static contacts and the wiring terminals are sequentially arranged in the second direction, and the wiring terminals are arranged side by side in pairs in the first direction. The first direction is perpendicular to the second direction. According to the utility model, the electromagnetic operating system and the contact support are arranged along the first direction, and the electromagnetic operating system, the static contact and the wiring terminal are arranged along the second direction, so that the electromagnetic operating system, the moving contact and the static contact are prevented from being arranged in the same direction, the internal layout is reasonable, and the overall size is reduced.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a built-in switch. Background Art

[0002] The existing prepaid energy meter mainly controls the power consumption of the main line through a built-in relay or an external circuit breaker. Since the current carrying capacity of the built-in relay is low, it is easy to cause failures such as burning or welding, and the external circuit breaker is large in size and short in life. At present, the power consumption of the main line is controlled by configuring a built-in switch in the energy meter.

[0003] In the existing built-in switches, the electromagnetic operating system, contact mechanism and wiring terminals are usually arranged in sequence along the same direction, and the moving contact assembly in the contact mechanism moves in a straight line under the drive of the electromagnetic operating system. This structure has the following defects: first, the moving contact, static contact and electromagnetic operating system require a large moving space in the same direction, and coupled with the wiring terminals and other components, the overall product occupies a large space in one direction; second, due to the limitation of the internal space, it is difficult to configure the current sampling device inside; third, when driving multiple moving contact assemblies, the electromagnetic operating system has higher requirements; fourth, when driving multiple moving contacts, a linkage part needs to be configured, and the moving trajectory of the linkage part also needs to occupy space. At the same time, the coordination between the linkage part, the moving contact and the electromagnetic operating system further increases the requirements for the electromagnetic operating system when realizing synchronous action. Summary of the invention

[0004] The purpose of the utility model is to overcome at least one defect of the prior art and provide a built-in switch.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a built-in switch, comprising a shell, wherein an electromagnetic operating system and at least one contact unit are arranged in the shell, wherein the contact unit comprises a wiring terminal and a contact mechanism, wherein the contact mechanism comprises a movable contact assembly and a stationary contact which cooperate with each other, wherein the movable contact assembly comprises a contact support and a movable contact connected to the contact support, wherein the electromagnetic operating system is opposite to an adjacent contact support in a first direction, and the contact support is driven to rotate by the electromagnetic operating system, wherein the electromagnetic operating system, the stationary contact and the wiring terminal are arranged in sequence along a second direction, and wherein the wiring terminals are arranged in pairs and side by side in the first direction, and are perpendicular to each other in the first direction and the second direction.

[0007] Preferably, at least two contact units are included, two adjacent contact units are arranged side by side along the first direction, and the rotation axis of each contact support is parallel to the third direction, and the third direction is perpendicular to the first direction and the second direction.

[0008] Preferably, the contact unit further comprises a current sampling device, the current sampling device is electrically connected to the wiring terminal, and the current sampling device is located between the wiring terminal and the electromagnetic operating system in the second direction.

[0009] Preferably, each contact unit further comprises an arc extinguishing chamber, and in the second direction, the arc extinguishing chamber is arranged in the housing between the contact mechanism and the connecting terminal.

[0010] Preferably, the current sampling device comprises a shunt or a mutual inductor, the shunt, the arc extinguishing chamber and the static contact are sequentially arranged along the first direction, and the shunt is arranged along the side position of each contact unit; or, in the second direction, the shunt is arranged between the arc extinguishing chamber and the wiring terminal;

[0011] The mutual inductor and the wiring terminal are arranged outside the shell, and the mutual inductor is located between the wiring terminal and the arc extinguishing chamber.

[0012] Preferably, each of the wiring terminals is connected to a conductive plate, and the conductive plate of at least one wiring terminal in each pair of wiring terminals passes through the central hole of the transformer.

[0013] Preferably, the electromagnetic operating system includes a yoke, a coil assembly and a moving assembly, the yoke cooperates with the coil assembly to drive the moving assembly to move linearly, the contact support is opposite to one end of the coil assembly on the moving trajectory of the moving assembly, and the moving assembly drives the contact support to rotate.

[0014] Preferably, a contact unit is included, and the contact unit includes two pairs of wiring terminals arranged side by side outside the housing, wherein one pair of wiring terminals is electrically connected to the moving contact and the stationary contact respectively.

[0015] Preferably, the contact unit further comprises a current sampling device, the current sampling device comprises a shunt and / or a mutual inductor, the shunt, the arc extinguishing chamber and the static contact are sequentially arranged along the first direction, and the shunt is arranged along the side position of each contact unit; or, in the second direction, the shunt is arranged between the arc extinguishing chamber and the wiring terminal;

[0016] The mutual inductor and the arc extinguishing chamber are arranged side by side in the housing in a first direction, and the mutual inductor is adjacent to the static contact.

[0017] Preferably, it includes at least two contact units, the contact supports of two adjacent contact units are assembled on the same plane for rotation side by side in a first direction, and the two adjacent contact supports are linked and connected, each contact unit includes a pair of wiring terminals, each wiring terminal is connected to a conductive plate, and each pair of wiring terminals passes through the center hole of a transformer and is electrically connected to the moving contact assembly and the static contact respectively.

[0018] Preferably, the contact support is provided with a transmission part, and the moving component is linked to the transmission part.

[0019] Preferably, a linkage structure is provided between the transmission part and the moving component, and the linkage structure comprises a matching groove and a matching part, and the matching part is inserted into the matching groove and slides in the matching groove.

[0020] Preferably, the matching portion is a convex shaft, the matching groove is a strip-shaped through groove, and the outer diameter of the matching portion is less than or equal to the minimum inner diameter of the matching groove.

[0021] Preferably, the moving assembly includes a moving iron core, a push rod and a linkage part. The moving iron core is slidably arranged in the middle part of the coil frame of the coil assembly. One end of the push rod is connected to the moving iron core, and the other end is plugged into one end of the linkage part. A mating part is provided on the linkage part, and the mating groove is arranged on the contact support.

[0022] Preferably, the linkage member is a strip-shaped structure parallel to the first direction, and at least two matching parts arranged side by side and at intervals are provided in the middle of the linkage member. A card slot is provided at one end of the linkage member, and the card slot is plugged into a card engaging part arranged at one end of the push rod.

[0023] Preferably, at least one strip groove serving as a guide groove is provided in the middle of the linkage member, and the guide groove is arranged along the first direction for slidingly cooperating with a guide portion arranged in the housing.

[0024] Preferably, the contact support includes two transmission parts, and a gap is left between the two transmission parts for the linkage member to pass through, so that the matching parts arranged on the positive and negative sides of the same position of the linkage member are respectively linked to the matching grooves of the two transmission parts.

[0025] In the built-in switch of the utility model, the electromagnetic operating system and the contact support are arranged along the first direction, and the electromagnetic operating system, the static contact and the wiring terminal are arranged along the second direction, so as to avoid the electromagnetic operating system, the moving contact and the static contact being arranged in the same direction, so that the internal layout is reasonable and the overall volume is reduced.

[0026] In addition, two or more contact units are arranged side by side along the first direction, and the rotation axis of the contact support is parallel to the third direction, which is beneficial to reducing the space occupied by the built-in switch as a whole in the third direction, that is, reducing the overall thickness of the built-in switch.

[0027] In addition, after configuring the current sampling device, one or both of the shunt and the transformer can be selected, which is conducive to monitoring the product current. In particular, the shunt is set along the side of the contact unit, and the transformer can be configured inside or outside the shell, which has strong selectivity and a wide range of applications.

[0028] In addition, the moving component moves linearly to drive the moving contact component to rotate, and the contact supports convert the linear motion of the electromagnetic operating system into swinging, which reduces the requirements for the electromagnetic operating system and the overall cost, and also avoids occupying too much space in the same direction, which is conducive to reducing the volume.

[0029] In addition, the built-in switch can be a single-phase built-in switch or a multi-phase built-in switch, which has a wide range of applications.

[0030] In addition, in a multi-phase built-in switch, its linkage is simultaneously driven and connected to multiple moving contact assemblies to ensure consistency of action, and the distribution of multiple moving contact assemblies and moving assemblies are all along the first direction, which shortens the moving stroke of the moving assembly and reduces the requirements for the electromagnetic operating system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the built-in switch of the utility model (single-phase);

[0032] Figure 2 This is the main view of the built-in switch of the utility model (single-phase);

[0033] Figure 3 It is a schematic diagram of the internal structure of the built-in switch of the utility model (single-phase);

[0034] Figure 4 It is a schematic diagram of the internal structure of the built-in switch of the utility model (single-phase and with the outer shell removed);

[0035] Figure 5 It is a schematic diagram of the coordination between the electromagnetic operating system and the moving contact assembly in the utility model;

[0036] Figure 6 This is a front view of the electromagnetic operating system and the moving contact assembly in the utility model;

[0037] Figure 7 It is a cross-sectional view of the electromagnetic operating system and the moving contact assembly in the utility model;

[0038] Figure 8 It is a structural schematic diagram of the moving contact assembly in the utility model;

[0039] Fig. 9 It is a cross-sectional view of the movable contact assembly in the utility model;

[0040] Fig.10 It is a schematic diagram of the cooperation between the moving contact and the contact spring in the utility model;

[0041] Fig.11 It is an exploded schematic diagram of the moving contact assembly in the utility model;

[0042] Fig.12It is a structural schematic diagram of the contact spring in the utility model;

[0043] Fig.13 It is a schematic diagram of the structure of the contact support in the utility model;

[0044] Fig.14 It is a cross-sectional view of the contact support in the utility model;

[0045] Fig.15 It is a structural schematic diagram of the built-in switch of the utility model (three-phase);

[0046] Fig.16 This is the main view of the built-in switch of the utility model (three-phase);

[0047] Fig.17 It is a schematic diagram of the internal structure of the built-in switch of the utility model (three-phase);

[0048] Fig.18 It is a schematic diagram of the coordination between the electromagnetic operating system and the three-phase moving contact in the utility model;

[0049] Fig.19 yes Fig.18 The main view;

[0050] Fig. 20 It is a structural schematic diagram (three-phase) of the electromagnetic operating system in the utility model;

[0051] Fig.21 yes Fig. 20 The main view;

[0052] Reference numerals:

[0053] 1-housing, 2-electromagnetic operating system, 21-yoke, 22-coil assembly, 221-coil frame, 23-moving assembly, 231-moving iron core, 232-push rod, 2321-clamping part, 233-linkage part, 2331-guide groove, 234-matching part, 235-cage, 3-contact mechanism, 31-contact support, 310-support body, 311-connecting hole, 312-transmission part, 313-accommodating cavity, 314-matching groove, 31 5-notch, 316-baffle, 32-moving contact, 320-moving contact piece, 321-moving contact point, 33-static contact, 34-positioning shaft, 341-sleeve, 35-contact spring, 350-twisted portion, 351-first abutting portion, 352-second abutting portion, 4-arc extinguishing chamber, 51-shunt installation position, 52-transformer, 6-connecting terminal, 71-first conductive plate, 72-second conductive plate, 73-third conductive plate, 74-fourth conductive plate. DETAILED DESCRIPTION

[0054] The following is a further description of the specific implementation of the built-in switch of the utility model in combination with the embodiments given in the accompanying drawings. The built-in switch of the utility model is not limited to the description of the following embodiments.

[0055] like Figure 1 , 15 As shown, the built-in switch includes a housing 1, an electromagnetic operating system 2 and at least one contact unit. The electromagnetic operating system 2 is arranged in the housing 1. Each contact unit includes a terminal 6 and a contact mechanism 3 electrically connected to the terminal 6. The contact mechanism 3 includes a moving contact assembly and a stationary contact 33 that cooperate with each other. The moving contact assembly includes a contact support 31 and a moving contact 32 connected to the contact support 31. The electromagnetic operating system 2 is directly or indirectly connected to the contact support 31 to drive the moving contact 32 to contact or separate from the stationary contact 33, thereby controlling the connection and disconnection of each contact unit.

[0056] When there are two or more contact units, two adjacent contact supports 31 are linked together, and the electromagnetic operating system 2 is linked together with one of the contact supports 31, and the remaining contact supports 31 act synchronously under the linkage action, or the electromagnetic operating system 2 is linked together with all the contact supports 31 at the same time to realize the synchronous opening and closing action of the contact mechanisms 3 of all contact units.

[0057] For the convenience of description, Figure 2 , 3 In , 16 and 17, the left-right direction is the first direction, the up-down direction is the second direction, and the direction perpendicular to the paper surface is the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0058] like Figure 1-3 As shown in 15-17, the improvement of the present application is that the electromagnetic operating system 2 is opposite to the adjacent contact support 31 in the first direction, and the contact support 31 is driven to rotate by the electromagnetic operating system 2, and the electromagnetic operating system 2, the static contact 33 and the connecting terminal 6 are arranged in sequence along the second direction, and the connecting terminal 6 is arranged in pairs and side by side in the first direction.

[0059] In this way, the electromagnetic operating system 2 and the contact support 31 are arranged along the first direction, so that the moving contact assembly and the electromagnetic operating system form a side by side structure. At the same time, through the coordination of the linear motion of the moving assembly 23 and the rotation of the moving contact assembly, the requirements for the electromagnetic operating system 2 and the overall cost are reduced, and it also avoids occupying too much space in the same direction, making full use of the internal space and helping to reduce the volume.

[0060] Furthermore, at least two contact units are arranged in the housing 1, and two adjacent contact units are arranged side by side along the first direction. The rotation axis of each contact support 31 is parallel to the third direction. Compared with the existing structure, such a structure is conducive to reducing the space occupied by the built-in switch as a whole in the third direction, that is, reducing the overall thickness of the built-in switch.

[0061] Furthermore, each contact unit also includes an arc extinguishing chamber 4. In the second direction, the arc extinguishing chamber 4 is arranged in the housing 1 between the contact mechanism 3 and the terminal 6. The arc extinguishing chamber 4 cooperates with the contact mechanism 3 to extinguish the arc generated by the disconnection.

[0062] Preferably, each contact unit also includes a current sampling device, which is coupled to the main line of each contact unit. The current sampling device feeds back the collected current signal to the control module, and the control module outputs a control signal to control the electric energy meter, wherein the control module can be the control module of the electric energy meter or a control module separately configured in the built-in switch.

[0063] Specifically, the current sampling device is coupled to the terminal 6, so as to be connected to the main line of each contact unit to detect the current of the main line. In the second direction, the current sampling device is located between the terminal 6 and the electromagnetic operating system 2; the current sampling device includes a shunt or a mutual inductor 52, wherein, when the current sampling device is a mutual inductor 52, the mutual inductor 52 can be arranged in the housing 1, and the mutual inductor 52 located in the housing 1 is arranged side by side with the arc extinguishing chamber 4 in the first direction, and the mutual inductor 52 is adjacent to the static contact 33. In addition, the mutual inductor 52 can also be arranged outside the housing 1 to avoid occupying too much internal space. At this time, in the second direction, the mutual inductor 52 is located between the terminal 6 and the arc extinguishing chamber 4; when the current sampling device is a shunt, the shunt can be a manganese copper resistor, and the shunt, the arc extinguishing chamber 4 and the static contact 33 are arranged in sequence along the first direction. Figure 3 , 4 In 15-17, the shunt is arranged at the shunt assembly position 51 on the conductive plate. Of course, the shunt can also be arranged at Figure 3 , 4 15-17 for assembling the position of the transformer 52, it should be noted that the shunt is arranged on the conductive plate connected to the terminal 6. In this way, the current sampling device can meet the needs of different products and has a wide range of applications.

[0064] like Figure 3 , 6As shown in , 7 and 17, the electromagnetic operating system 2 includes a yoke 21, a coil assembly 22 and a moving assembly 23, wherein the yoke 21 cooperates with the coil assembly 22 to drive the moving assembly 23 to move linearly, wherein the moving trajectory of the moving assembly 23 is parallel to the first direction, and of course it can also be a direction slightly angled with the first direction, the contact support 31 is opposite to one end of the coil assembly 22 on the moving trajectory of the moving assembly 23, and the contact support 31 is driven to rotate by the moving assembly 23, so that the moving assembly moves linearly to drive the moving contact assembly to rotate, and the contact support 31 converts the linear motion of the electromagnetic operating system 2 into swinging, which reduces the requirements for the electromagnetic operating system 2 and the overall cost, and also avoids occupying too much space in the same direction, which is conducive to reducing the volume.

[0065] Specifically, a coordinated linkage structure is provided between the moving assembly 23 and the contact support 31, such as Figure 5 , 6 As shown in FIGS. 18 and 19, a transmission part 312 is provided on the contact support 31, and a linkage structure is provided between the transmission part 312 and the moving component 23. The linkage structure includes a mating part 234 and a mating groove 314 which are plugged into each other. The mating groove 314 is provided on the moving component 23 or the contact support 31, and the mating part 234 is provided on the contact support 31 or the moving component 23. The mating groove 314 reserves a space for the mating part 234 to slide, so that the mating part 234 and the mating groove 314 slide relative to each other as the contact support 31 rotates. The mating part 234 and the mating groove 314 slide relative to each other on the basis of plug-in mating, thereby driving the contact component to swing, avoiding the use of a straight line for the moving trajectories of the moving component 23 and the moving contact component. The moving contact component can be driven by moving a smaller distance, thereby shortening the moving stroke of the moving component 23, reducing the requirements for the electromagnetic operating system 2, and saving internal space and reducing the overall volume.

[0066] In addition, one, two or more contact units may be arranged in the housing 1, wherein the contact support 31 and the electromagnetic operating system 2 in each contact unit are opposite to each other in the first direction.

[0067] Specific combination Figure 1-14 A first embodiment of a built-in switch is provided. In this embodiment, the built-in switch is a single-phase built-in switch, that is, it has only one contact unit.

[0068] like Figure 1-3 As shown, the built-in switch includes a shell 1, an electromagnetic operating system 2 is arranged in the shell 1, the electromagnetic operating system 2 is arranged at the upper part of the shell 1, the electromagnetic operating system 2 is used to drive a contact unit, and the electromagnetic operating system 2 generally includes a yoke 21, a coil assembly 22 and a moving assembly 23. The yoke 21 and the coil assembly 22 cooperate to drive the moving assembly 23 to move in a straight line.

[0069] The contact unit includes a contact mechanism 3 arranged in the housing 1, the contact mechanism 3 includes a movable contact assembly and a stationary contact 33 that cooperate with each other, the movable contact assembly includes a contact support 31 and a movable contact 32, the contact support 31 is rotatably arranged in the housing 1, in a first direction, the contact support 31 is opposite to one end of the coil assembly 22, preferably, the contact support 31 corresponds to one end of the coil assembly 22 along the axial direction of the coil assembly 22, thereby ensuring that the movable assembly 22 and the contact support 31 have a good driving connection, Figure 3 , 4 In the embodiment, the axial direction of the coil component 22 is slightly angled with the first direction, which makes full use of the space in the housing 1 and can reduce the space occupied by the contact support 31 and the coil component 22 as a whole in the first direction; of course, the axial direction of the coil component 22 can also be parallel to the first direction; the moving component 22 is linked to the contact support 31. In the present embodiment, the moving component 23 is provided with a mating portion 234, and the contact support 31 is provided with a mating groove 314. The mating groove 314 reserves space for the mating portion 234 to slide, so that the contact support 31 is driven by the moving component 22 to rotate, and the moving contact 32 is rotatably connected to the contact support 31.

[0070] The contact unit also includes an arc extinguishing chamber 4 arranged in the housing 1, and the arc extinguishing chamber 4 is cooperated with the contact mechanism 3 to extinguish the arc. In the second direction, the static contact 33 is arranged between the electromagnetic operating system 2 and the arc extinguishing chamber 4. In the figure, the static contact 33 and the moving contact 32 correspond to one side of the arc entrance of the arc extinguishing chamber 4 respectively. In the second direction, the moving contact 32 is located between the contact support 31 and the arc entrance of the arc extinguishing chamber 4, and the static contact 33 is located between the coil assembly 22 and the arc entrance of the arc extinguishing chamber 4.

[0071] The contact unit further includes wiring terminals 6 arranged in pairs, and the contact mechanism 3 is electrically connected between a pair of wiring terminals 6. Figure 3 , 4 In the embodiment, the electromagnetic operating system 2, the static contact 33 and the connecting terminal 6 are sequentially arranged along the second direction, and the connecting terminals 6 arranged in pairs are arranged side by side in the first direction. Preferably, the connecting terminals 6 are arranged outside the housing 1 to avoid occupying too much space inside the housing.

[0072] like Figure 1-3 As shown, the contact unit includes two pairs of wiring terminals 6 arranged side by side, wherein one pair of wiring terminals 6 is electrically connected to the moving contact assembly and the stationary contact 33 to form an L-pole loop of the contact unit, and the other pair of wiring terminals 6 is electrically connected in the housing 1 to form a straight-through N-pole loop. Of course, only one pair of wiring terminals that are electrically connected to the moving contact assembly and the stationary contact 33 to form an L-pole loop of the contact unit may be provided, and no N-pole loop may be provided.

[0073] Specifically, each terminal 6 is connected to a conductive plate. In this embodiment, Figure 3 , 5 As shown, the conductive plates on one pair of terminals 6 extend into the housing 1 and correspond to the bottom of the coil assembly 22, and the right side of the arc extinguishing chamber 4 is bent and connected to form an N-pole loop; one conductive plate on the other pair of terminals 6 extends along the side of the housing 1 for electrical connection with the moving contact assembly, and the other conductive plate extends to the middle of the housing 1 for connection with the static contact 33.

[0074] For the convenience of description, the conductive plate electrically connected between the moving contact assembly and the terminal 6 is the first conductive plate 71, and the conductive plate electrically connected between the static contact 33 and the terminal 6 is the second conductive plate 72. Preferably, the first conductive plate 71 is arranged along the side of the housing 1. In the figure, a shunt installation position 51 is arranged on the first conductive plate 71. Preferably, in the first direction, the shunt installation position 51, the arc extinguishing chamber 4 and the static contact 33 are arranged in sequence. Of course, the shunt installation position 51 can also be arranged on the second conductive plate 72. The installation position 51 can be outside the shell 1 or inside the shell 1; the second conductive plate 72 extends along one side of the arc extinguishing chamber 4, and the end of the second conductive plate 72 is bent and extended between the coil assembly 22 and the arc extinguishing chamber 4 to form a static contact plate, and a static contact point cooperating with the moving contact 32 is provided on the static contact plate, and the number of the static contacts is the same as the number of the moving contacts of the moving contact 22, so that the second conductive plate 72 forms a static contact 33, which has the advantages of simple structure and low cost; the two conductive plates forming the N-pole loop are the third conductive plate 73 and the fourth conductive plate 74 respectively.

[0075] In this embodiment, the contact unit is also provided with a current sampling device, which includes a shunt and / or a mutual inductor 52. The shunt is preferably assembled on the shunt installation position 51 in the figure, so that the shunt, the arc extinguishing chamber 4 and the static contact 33 are arranged in sequence along the first direction, the shunt is arranged along the side position of the contact unit, and at least a part of the shunt is located outside the shell 1; the mutual inductor 52 and the arc extinguishing chamber 4 are arranged side by side in the first direction in the shell 1, and the mutual inductor 52 is adjacent to the static contact 33. The conductive plate of one of the terminals 6 in each pair of terminals 6 passes through the center hole of the mutual inductor 52, and the mutual inductor 52 detects whether there is leakage current in the contact unit. In this embodiment, the shunt is used to collect current signals, and the mutual inductor 52 is used to detect leakage current. The second conductive plate 72 and the third conductive plate 73 are closer to the mutual inductor 52, and the second conductive plate 72 and the third conductive plate 73 pass through the center hole of the mutual inductor 52.

[0076] Combination Figure 3-7 An electromagnetic operating system 2 applied to this embodiment is provided.

[0077] like Figure 7As shown, the electromagnetic operating system 2 includes a yoke 21, a coil assembly 22 and a moving assembly 23, the coil assembly 22 includes a coil frame 221 and a coil, the moving assembly 23 includes a moving iron core 231, a push rod 232 and a linkage 233, the coil is wound around the outer middle part of the coil frame 221, the middle part of the coil frame 221 is a hollow cavity, the yoke 21 is surrounded and arranged on the outer side of the coil frame 221, in the figure, the yoke 21 is a frame structure, the coil frame 221 and the coil are both located in the yoke 21, the moving iron core 231 is made of a magnetic conductive material, the moving iron core 231 is slidably assembled in the middle part of the coil frame 221, under the cooperation of the yoke 21 and the coil assembly 22, the moving iron core 231 moves in a straight line in the middle part of the coil frame 221, that is, the moving iron core 231 moves along a direction parallel to the coil assembly 2 2, the push rod 232 is made of non-magnetic material, one end of the push rod 232 is connected to the moving iron core 231, preferably, the push rod 232 is fixedly connected to the moving iron core 231, the other end passes through the yoke 21 and extends out of the coil skeleton 221 and is fixedly connected to the linkage member 233, preferably, the end of the push rod 232 is provided with a protruding engaging portion 2321, in this embodiment, the linkage structure is arranged between the linkage member 233 and the contact support 31, in the figure, the linkage member 233 is provided with a card slot 235 plugged with the engaging portion 2321, the linkage member 233 is provided with a matching portion 234, in this embodiment, the linkage member 233 can be a plate-like structure or a block-like structure with a certain length, the matching portion 234 is a convex shaft, and the protruding direction of the convex shaft is perpendicular to the moving trajectory of the push rod 232. Of course, when the length of the push rod 232 is large enough and the number of contact mechanisms 3 driven is small, the linkage part 233 can be omitted. In this case, the mating part 234 can be arranged on the push rod 232. In this case, the moving component 23 includes a moving iron core 231 and a push rod 232. In addition, when the push rod 232 can be integrally formed with the moving iron core 231, the contact mechanism 3 can also be directly driven by the moving iron core 231. That is, the moving component 23 only includes the moving iron core 231 (push rod 232), and the mating part 234 is arranged on the moving iron core 231 (push rod 232).

[0078] In addition, the electromagnetic operating system 2 also includes a magnet, which cooperates with the yoke 21 and the coil assembly 22 respectively, so that the moving iron core 231 can be kept in a closed or open state. When the power is on, the yoke 21 and the coil assembly 22 jointly drive the moving iron core 231 to move to the open or closed state. In this way, the electromagnetic operating system 2 does not need to be in a powered state for a long time. Of course, the electromagnetic operating system 2 can also use existing magnetic holding products.

[0079] like Figure 3 , 4As shown in Figures 8-14, the contact mechanism 3 includes a moving contact assembly and a stationary contact 33. The moving contact assembly includes a contact support 31, a moving contact 32 and a contact spring 35. The contact support 31 is rotatably arranged in the housing 1, and the contact support 31 is opposite to one end of the coil assembly 22 along the axial direction of the coil assembly 22. The moving assembly 23 moves along a straight line between the contact support 31 and the coil assembly 22. The moving assembly 23 drives the contact support 31 to rotate. At the same time, during the rotation of the contact support 31, the contact support 31 and the moving assembly 23 are Relative sliding occurs between them; one end of the moving contact 32 is rotatably connected to the contact support 31, and the other end is provided with a moving contact 321 for cooperating with the static contact of the static contact 33. The contact spring 35 is arranged between the contact support 31 and the moving contact, and the contact spring 35 provides contact pressure for the moving contact 32. Preferably, the moving contact 32 and the contact spring 35 are coaxially rotatably assembled on the contact support 31. In this embodiment, the moving contact 32 and the contact spring 35 are assembled on the positioning shaft 34, and the rotation of the moving contact 32 simultaneously drives the positioning shaft 34 to rotate.

[0080] like Figure 3-9 , 11, 13 and 14, the contact support 31 is provided with a transmission part 312, and the transmission part 312 and the moving contact 32 are respectively located on opposite sides of the rotation center of the contact support 31, and a matching groove 314 is provided on the transmission part 312. In the figure, the matching groove 314 is a bar-shaped through groove, and a matching part 234 is provided on the moving component 23. The matching part 234 is a convex shaft, and the outer diameter of the convex shaft is less than or equal to the minimum inner diameter of the matching groove 314. When the moving component 23 moves along a straight line, the matching part 234 first links with the matching groove 314 to drive the contact support 31 rotates, and during the rotation of the contact support 31, the mating portion 234 slides in the mating groove 314, that is, a space for the mating portion 234 to move is reserved in the mating groove 314, that is, the space reserved for the strip-shaped through groove in its length direction, thereby completing the driving of the moving contact assembly. In this way, the moving contact assembly can be driven by slidingly mating with the mating groove 314 through the simple structure, and a small distance is moved, thereby shortening the moving stroke of the moving assembly 23 and reducing the requirements for the electromagnetic operating system 2.

[0081] Combination Fig.13 , 14A structure of a contact support 31 used in the present embodiment is provided, wherein the contact support 31 comprises a circular shaft-shaped support body 310, wherein a receiving cavity 313 is provided in the middle of the support body 310, wherein the receiving cavity 313 is provided with an opening corresponding to the side of the support body 310, wherein a notch 315 is provided at one edge of the opening, and connecting holes 311 penetrating the receiving cavity 313 are provided at both ends of the support body 310, wherein a positioning shaft 34 is provided in the connecting hole 311 so as to allow the positioning shaft 34 to penetrate the receiving cavity 313, wherein one end of the moving contact 32 is connected to the positioning shaft 34 and the positioning shaft 34 rotates with the moving contact 32, that is, one end of the moving contact 32 and the contact spring 35 are provided in the receiving cavity 313, and a transmission part 312 and a baffle 316 are provided on opposite sides of the rotation center of the support body 310, wherein the transmission part 312 is a protruding boss structure, and the transmission part 316 is provided on opposite sides of the rotation center of the support body 310, wherein the transmission part 312 is a protruding boss structure, and the transmission part 316 is provided on the ... and the transmission part 316 is provided on the opposite sides of the rotation center of the support body 310 There are two parts 312, which correspond to the opposite ends of the accommodating cavity 313 respectively. The transmission part 312 is provided with a strip through groove as a matching groove 314, and the penetration direction of the matching groove 314 is parallel to the axial direction of the supporting body 310. The same matching part 234 arranged on the linkage part 233 passes through the matching grooves 314 on the two transmission parts 312 on the same contact support 31. Of course, the interval left between the two transmissions 312 can also be used for the linkage part 233 to pass through, so that the matching parts 234 arranged on the positive and negative sides of the same position of the linkage part 233 are respectively matched with the matching grooves 314 of the two passing parts 312; the baffle 316 is connected to the edge of the open side with the notch 315. In the figure, the baffle 316 is formed by extending outward from the edge area of ​​the supporting body 310, and the middle part of the moving contact 32 extends out from the notch 315 and matches with the baffle 316. Of course, when the contact support 31 is provided with only one transmission part 312 , it can also realize linkage with the transmission member 233 , but the stability may be slightly poor.

[0082] like Figure 8 , 10As shown in Figure 11, the moving contact 32 includes at least two moving contact pieces 320 arranged in parallel. The two moving contact pieces 320 are preferably connected together to ensure the consistency of movement. One end of each moving contact piece 320 is located in the accommodating cavity 313 and is rotatably connected to the positioning shaft 34. The other end is provided with a moving contact 321 for cooperating with the static contact of the static contact 33. The moving contact piece 320 is a plate-shaped structure as a whole. A through hole for the positioning shaft 34 to pass through is provided at one end of the moving contact piece 320, and the positioning shaft 34 rotates with the rotation of the moving contact 32. The middle side of the moving contact piece 320 is convex to form a spring for cooperating with the contact spring. The mating area is elastically connected to the spring 35, and the middle side of the moving contact piece 320 facing away from the mating area extends out from the notch 315 of the accommodating cavity 313 to cooperate with the baffle 316; a moving contact point 321 is provided on the side of the other end of the moving contact 32, and the moving contact point 321 and the mating area are respectively located on the opposite sides of the same moving contact piece 320. By setting at least two moving contact pieces 320, the current carrying capacity is improved; of course, the moving contact 32 may also include only one moving contact piece 320, or the moving contact 32 and the static contact 33 cooperating with the moving contact 32 may also adopt the existing technology.

[0083] like Figure 8-12 As shown, the contact spring 35 includes two torsion springs, each of which includes a twisted portion 350. The two twisted portions 350 are assembled on the positioning shaft 34 at intervals, and a connecting space for connecting the moving contact 32 is reserved between the two twisted portions 350. One end of each twisted portion 350 extends outward to form a first elastic arm abutting the moving contact 32, and the other end of each twisted portion 350 extends outward to form a second elastic arm abutting the contact support 31. The extension directions of the first elastic arm and the second elastic arm are parallel to the axial direction of the twisted portion 350. In this embodiment, the first elastic arms of the two torsion springs are connected to form a first abutting portion 351, and the first abutting portion 351 abuts against the matching area of ​​the moving contact 32. The second elastic arms of the two torsion springs are connected to form a second abutting portion 352, and the first abutting portion 351 and the second abutting portion 352 both span the connecting space. Of course, the first elastic arms of the two torsion springs can also extend toward each other, so that the gap width between the ends of the two first elastic arms is smaller than the width of the connection space, and each first elastic arm abuts against an adjacent moving contact piece 320. Similarly, the second elastic arms of the two torsion springs can also only extend toward each other. Of course, the contact spring 35 can also be a torsion spring, but its stability may be poor.

[0084] In addition, if Fig.11 As shown, a sleeve 341 is sleeved on the outer side of the positioning shaft 34 , and at least part of the sleeve 341 is located between the contact spring 35 and the outer side of the positioning shaft 34 to prevent the contact spring 35 from locking the positioning shaft 34 , so that the positioning shaft 34 cannot rotate together with the moving contact 32 .

[0085] The static contact 33 adopts the existing technology. The static contact 33 includes a static contact plate, which is fixed in the shell 1 and is spaced opposite to the moving contact 32. A static contact is provided on the side of the static contact plate facing the moving contact 32. The number of static contacts can be one, or two or more for one-to-one correspondence with the moving contact 321; preferably, one end of the static contact plate is also bent and extended to form an arc-striking portion. The arc extinguishing chamber 4, the current sampling device and the terminal 6 all adopt the existing technology. The arc entrance port of the arc extinguishing chamber 4 cooperates with the arc-striking portion of the static contact 33, and the current sampling device is connected to the control module for feedback of the current signal.

[0086] Combination Figure 15-21 A second embodiment of the built-in switch is provided. The built-in switch is a three-phase built-in switch, that is, it includes three contact units arranged side by side.

[0087] like Figure 15-18 As shown, the built-in switch includes a shell 1, an electromagnetic operating system 2 is arranged in the shell 1, and the electromagnetic operating system 2 is arranged in the shell 1 near the side position. The electromagnetic operating system 2 is used to drive three contact units. The electromagnetic operating system 2 generally includes a yoke 21, a coil assembly 22 and a moving assembly 23. The yoke 21 cooperates with the coil assembly 22 to drive the moving assembly 23 to move in a straight line. In this embodiment, the axial direction of the coil assembly 22 is parallel to the first direction, so that the moving trajectory of the moving assembly 23 is also parallel to the first direction.

[0088] The three contact units are arranged side by side in a direction parallel to the moving trajectory of the moving component 23, and the three contact units all correspond to the same end of the electromagnetic operating system 2. In this embodiment, the three contact units are arranged side by side in a first direction, and the rotation axis of the moving contact assembly (contact support 31) in each contact unit is parallel to the third direction, which is conducive to reducing the space occupied by the built-in switch in the third direction, that is, it is conducive to thinning the overall thickness. Each contact unit includes the same contact mechanism as the above embodiment, and the moving contact assemblies in the three contact units are rotatably arranged on the same plane, that is, the three moving contacts The contact support 31 of the component is rotatably arranged on the same plane. In a first direction, one end of the electromagnetic operating system 2 is opposite to an adjacent moving contact component, and the two adjacent moving contact components are linked together. In the present embodiment, all the moving contact components are linked together with the moving component 23, that is, the moving component 23 is provided with a mating portion 234, and the contact support 31 is provided with a mating groove 314. The mating groove 314 reserves a space for the mating portion 234 to slide, so that the contact support 31 is directly driven by the moving component 22 to rotate, thereby ensuring the consistency of the movements of the moving contact components in the three contact units.

[0089] Each contact unit further includes an arc extinguishing chamber 4. Similar to the first embodiment, the arc extinguishing chamber 4 is arranged on one side of the contact mechanism 3 for extinguishing the arc. In the second direction, the static contact 33 is arranged between the electromagnetic operating system 2 and the arc extinguishing chamber 4. Fig.17 In the figure, the static contact 33 and the moving contact 32 correspond to one side of the arc entrance of the arc extinguishing chamber 4 respectively. In the second direction, the moving contact 32 is located between the contact support 31 and the arc entrance of the arc extinguishing chamber 4, and the static contact 33 is located between the coil assembly 22 and the arc entrance of the arc extinguishing chamber 4.

[0090] Each contact unit also includes a pair of terminals 6. Preferably, the terminals 6 are also arranged outside the housing 1. The contact mechanism 3 is electrically connected between the pair of terminals 6. The electromagnetic operating system 2, the static contact 33 and the terminals 6 are arranged in sequence along the second direction, and the terminals 6 of two adjacent contact units are arranged side by side in the first direction.

[0091] Specifically, each terminal is connected to a conductive plate, and each conductive plate extends into the housing 1 for coupling with the moving contact assembly or the static contact 33. Similar to the above embodiment, the conductive plate coupled between the moving contact assembly and the terminal 6 is a first conductive plate 71, and the conductive plate coupled between the static contact 33 and the terminal 6 is a second conductive plate 72, wherein the first conductive plate 71 and the second conductive plate 72 extend along opposite sides of the arc extinguishing chamber 4 respectively, and the static contact 33 is also formed by bending and extending the end of the second conductive plate 72.

[0092] In this embodiment, each contact unit is also provided with a current sampling device, and the current sampling device includes a shunt or a mutual inductor 52. When the current sampling device is a shunt, the shunt is mounted on a first conductive plate 71, and the first conductive plate 71 is provided with a shunt installation position 51. In the first direction, the shunt installation position 51 is arranged side by side with the arc extinguishing chamber 4. The shunt installation position 51 is preferably located outside the housing 1. Of course, it can also be located inside the housing 1. In this way, after the shunt is assembled, the shunt, the arc extinguishing chamber 4 and the static contact 33 are arranged in sequence along the first direction, and the first conductive plate 71 area provided with the shunt installation position 51 is arranged along the side position of the contact unit, and two adjacent The contact units can be separated by the area of ​​the first conductive plate 71 where the shunt mounting position 51 is provided. Preferably, a mounting groove for assembling the first conductive plate 71 is provided in the housing 1, and there are at least two mounting grooves located at the side positions of each contact unit. The shunt can be arranged inside or outside the housing 1; of course, the shunt mounting position 52 is located outside the housing 1 and corresponds to between the arc extinguishing chamber 4 and the terminal 6. At this time, the shunt mounting position 52 is set on one of the conductive plates, that is, the shunt is coupled to the first conductive plate 71 or the second conductive plate 72. In this way, after the shunt is assembled, the shunt is located between the arc extinguishing chamber 4 and the terminal 6 in the second direction.

[0093] Alternatively, the current sampling device is a transformer 52, and one of the conductive plates connected to the terminal 6 passes through the transformer 52, that is, the first conductive plate 71 or the second conductive plate 72 passes through the center hole of the transformer 52. At this time, the transformer 52 is also located between the arc extinguishing chamber 4 and the terminal 6.

[0094] In this embodiment, a zero-sequence transformer may also be configured to detect leakage current, so that the switch device has a leakage protection function. The zero-sequence transformer only needs to pass through the conductive plate on one terminal 6 in each pair of terminals 6.

[0095] The contact mechanism 3, arc extinguishing chamber 4, current sampling device and wiring terminal 6 of each contact unit in this embodiment are the same as those in the first embodiment. Except for the linkage member 233, the other structures of the electromagnetic operating system 2 are also the same as those in the first embodiment. In this embodiment, the linkage member 233 is simultaneously connected to the three contact supports 31 for driving. The linkage member 233 is provided with three matching parts 234 arranged side by side and at intervals along the direction of the moving track. The number of the matching parts 234 preferably matches the number of the matching slots 314. The shapes and matching principles of the matching parts 234 and the matching slots 314 are the same as those in the first embodiment.

[0096] like Figure 18-21 As shown, the linkage member 233 synchronously drives the three contact supports 31, and its length is relatively large. The linkage member 233 is a strip plate structure, and the linkage member 233 moves linearly along its length direction, that is, the linkage member 233 is arranged along the first direction, and the linkage member 233 is provided with three mating parts 234 arranged side by side and spaced in the first direction, and each mating part 234 is respectively linked and connected with a mating groove 314 of a contact support 31.

[0097] In this embodiment, the linkage member 233 is plugged into one end of the push rod 232. Preferably, a slot 235 is provided at one end of the linkage member 233, and a snap-fit ​​portion 2321 is provided at one end of the push rod 232. The snap-fit ​​portion 2321 and the slot 235 are plugged into each other, which has the advantages of convenient assembly and stable connection. Of course, when the push rod 232 is not provided, the snap-fit ​​portion 2321 can be directly provided at one end of the moving iron core 231; a strip groove is provided in the middle of the linkage member 233, which can be used as a guide groove 2331, and the guide groove 2331 is provided along a moving trajectory parallel to the linkage member 233. In this embodiment, at least two parallel guide grooves 2331 are provided on the linkage member 233, and the guide groove 2331 is a through groove with a certain length, which is also conducive to reducing its overall weight. A guide portion (not shown) can be provided on the inner side wall of the shell 1, and the guide portion and the guide groove 2331 are slidably matched to limit the moving trajectory of the linkage member 233, ensuring that the movement process will not be offset.

[0098] In addition, in this embodiment, each mating portion 234 protrudes from the front and back sides of the same position of the linkage member 233. When the linkage member 233 passes through the gap between the two transmission portions 312, the two ends of each mating portion 234 are respectively connected to the mating grooves 314 of the two transmission portions 312 on the same contact support 31, thereby improving the driving stability between the linkage member 233 and the contact support 31.

[0099] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0100] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A built-in switch, comprising a housing (1), wherein an electromagnetic operating system (2) and at least one contact unit are arranged in the housing (1), wherein the contact unit comprises a wiring terminal (6) and a contact mechanism (3), wherein the contact mechanism (3) comprises a movable contact assembly and a stationary contact (33) that cooperate with each other, wherein the movable contact assembly comprises a contact support (31) and a movable contact (32) connected to the contact support (31), Features: The electromagnetic operating system (2) is opposite to an adjacent contact support (31) in a first direction, and the electromagnetic operating system (2) drives the contact support (31) to rotate. The electromagnetic operating system (2), the stationary contact (33) and the connecting terminal (6) are arranged in sequence along a second direction, and the connecting terminals (6) are arranged in pairs and side by side in the first direction, and the first direction and the second direction are perpendicular to each other.

2. The built-in switch according to claim 1, characterized in that: It comprises at least two contact units, two adjacent contact units are arranged side by side along a first direction, and the rotation axis of each contact support (31) is parallel to a third direction, and the third direction is perpendicular to the first direction and the second direction.

3. The built-in switch according to claim 2, characterized in that: The contact unit further comprises a current sampling device, the current sampling device is electrically connected to the wiring terminal (6), and the current sampling device is located between the wiring terminal (6) and the electromagnetic operating system (2) in the second direction.

4. The built-in switch according to claim 3, characterized in that: Each contact unit further comprises an arc extinguishing chamber (4), which is arranged in the housing (1) between the contact mechanism (3) and the connecting terminal (6) in the second direction.

5. The built-in switch according to claim 4, characterized in that: The current sampling device comprises a shunt or a mutual inductor (52), wherein the shunt, the arc extinguishing chamber (4) and the static contact (33) are arranged in sequence along a first direction, and the shunt is arranged along the side position of each contact unit; or, in the second direction, the shunt is arranged between the arc extinguishing chamber (4) and the wiring terminal (6); The mutual inductor (52) and the wiring terminal (6) are arranged outside the housing (1), and the mutual inductor (52) is located between the wiring terminal (6) and the arc extinguishing chamber (4).

6. The built-in switch according to claim 5, characterized in that: A conductive plate is connected to each of the wiring terminals (6), and the conductive plate of at least one wiring terminal (6) in each pair of wiring terminals (6) passes through the central hole of the mutual inductor (52).

7. The built-in switch according to claim 1, characterized in that: The electromagnetic operating system (2) comprises a yoke (21), a coil assembly (22) and a moving assembly (23); the yoke (21) cooperates with the coil assembly (22) to drive the moving assembly (23) to move linearly; the contact support (31) is opposite to one end of the coil assembly (22) on the moving track of the moving assembly (23); and the moving assembly (23) drives the contact support (31) to rotate.

8. The built-in switch according to claim 7, characterized in that: It comprises a contact unit, which comprises two pairs of connection terminals (6) arranged side by side outside the housing (1), wherein one pair of connection terminals (6) is electrically connected to a moving contact (32) and a stationary contact (33) respectively.

9. The built-in switch according to claim 8, characterized in that: The contact unit further comprises a current sampling device, the current sampling device comprising a shunt and / or a mutual inductor (52), the shunt, the arc extinguishing chamber (4) and the static contact (33) being arranged in sequence along a first direction, the shunt being arranged along the side position of each contact unit; or, in a second direction, the shunt is arranged between the arc extinguishing chamber (4) and the wiring terminal (6); The mutual inductor (52) and the arc extinguishing chamber (4) are arranged side by side in the first direction inside the housing (1), and the mutual inductor (52) is adjacent to the static contact (33).

10. The built-in switch according to claim 9, characterized in that: The invention comprises at least two contact units, wherein the contact supports (31) of two adjacent contact units are rotated side by side in a first direction and assembled on the same plane, and the two adjacent contact supports (31) are linked and connected, and each contact unit comprises a pair of wiring terminals (6), each wiring terminal (6) is connected to a conductive plate, and each pair of wiring terminals (6) is electrically connected to a moving contact assembly and a stationary contact (33) respectively after passing through a central hole of a mutual inductor (52).

11. The built-in switch according to any one of claims 8 to 10, characterized in that: The contact support (31) is provided with a transmission part (312), and the moving component (23) is linked to the transmission part (312).

12. The built-in switch according to claim 11, characterized in that: A linkage structure is provided between the transmission part (312) and the moving assembly (23), wherein the linkage structure comprises a matching groove (314) and a matching part (234), wherein the matching part (234) is inserted into the matching groove (314) and slides in the matching groove (314).

13. The built-in switch according to claim 12, characterized in that: The matching portion (234) is a convex shaft, the matching groove (314) is a strip-shaped through groove, and the outer diameter of the matching portion (234) is less than or equal to the minimum inner diameter of the matching groove (314).

14. The built-in switch according to claim 12, characterized in that: The moving assembly (23) comprises a moving iron core (231), a push rod (232) and a linkage member (233); the moving iron core (231) is slidably arranged in the middle of the coil frame (221) of the coil assembly (22); one end of the push rod (232) is connected to the moving iron core (231), and the other end is plugged into one end of the linkage member (233); a matching portion (234) is provided on the linkage member (233); and the matching groove (314) is arranged on the contact support (31).

15. The built-in switch according to claim 14, characterized in that: The linkage member (233) is a strip-shaped structure parallel to the first direction. The middle part of the linkage member (233) is provided with at least two matching parts (234) arranged side by side and at intervals. One end of the linkage member (233) is provided with a clamping groove (235), and the clamping groove (235) is plugged into a clamping part (2321) arranged at one end of the push rod (232).

16. The built-in switch according to claim 15, characterized in that: At least one strip groove serving as a guide groove (2331) is provided in the middle of the linkage member (233), and the guide groove (2331) is provided along a first direction for slidingly cooperating with a guide portion provided in the housing (1).

17. The built-in switch according to claim 14, characterized in that: The contact support (31) comprises two transmission parts (312), and a gap is left between the two transmission parts (312) for the linkage member (233) to pass through, so that the matching parts (234) arranged on the positive and negative sides of the same position of the linkage member (233) are respectively connected in a linkage manner with the matching grooves (314) of the two transmission parts (312).

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