Electric appliance switch

Abstract

The invention discloses an electric appliance switch, and relates to the technical field of electric appliance equipment, the electric appliance switch comprises a static contact system, a moving contact system, an electric appliance switch shell and an arc extinguishing system, the arc extinguishing system comprises two static arc striking angles, an arc contact system, an arc extinguishing assembly, a transmission assembly and a shell; the two static arc striking angles are electrically connected with the static contact system and the moving contact system respectively; the arc contact system is used for making contact with the two static arc striking angles and achieving conduction of the two static arc striking angles and is used for being away from the two static arc striking angles and achieving disconnection of the two static arc striking angles. The transmission assembly is configured to transmit power generated when the moving contact system is switched on and switched off to the arc contact system, so that connection between the arc contact system and the two static arc striking angles is prior to connection between the static contact system and the moving contact system. And the disconnection between the arc contact system and the two static arc striking angles lags behind the disconnection between the static contact system and the moving contact system. The operation and maintenance cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to an electrical switch. Background Art

[0002] During the operation of the switch, the voltage between the contacts will cause discharge in the air medium and form an arc. The arc becomes a safety hazard for electrical equipment. For this reason, arc extinguishing systems are usually installed in various electrical switches such as circuit breakers and contactors to extinguish the arc to ensure the safe operation of electrical equipment.

[0003] The arc extinguishing system and the contact system are the core components of the electrical switch, which are used to limit the arc space position and accelerate the arc extinguishing. In the high-voltage and large-capacity electrical switch technology, it is often adopted to set a number of contact components longer than the main contact in the moving contact of the contact system as arc contacts to reduce the ablation of the main contact and to cooperate with the arc extinguishing system to increase the arc extinguishing effect. The above existing technical solutions all have the disadvantage that the entire contact system must be replaced after the arc contact is damaged. At the same time, when the arc contact damage process is in the final stage, it is also easy to cause abnormal consumption and damage to the arc striking structure of the arc extinguishing system, resulting in increased maintenance costs; on the other hand, the arc extinguishing system and the contact system are the core components of the electrical switch, and the structure is complex. They are closely matched with the operating mechanism, the electrical parameter acquisition system, the product frame shell, etc., and the disassembly and assembly are difficult, the time required is long, and the proportion of the overall cost is high. The effectiveness of the arc extinguishing system and the contact system directly affects the disconnection reliability and electrical life of the electrical switch. Therefore, when the arc extinguishing system and contact system of an electrical switch fail, maintenance is often performed by replacing the entire electrical switch. Summary of the invention

[0004] The purpose of the present invention is to provide an electrical switch to solve the problems existing in the above-mentioned prior art and reduce operation and maintenance costs.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides an electrical switch, comprising a static contact system, a moving contact system, an electrical switch housing and an arc extinguishing system, wherein the arc extinguishing system comprises: two static arc-striking angles, an arc contact system, an arc extinguishing assembly, a transmission assembly and a housing; the two static arc-striking angles are electrically connected to the static contact system and the moving contact system respectively; the arc contact system is used to contact the two static arc-striking angles and realize conduction between the two, and to stay away from the two static arc-striking angles and realize disconnection between the two; the arc extinguishing assembly is constructed to extinguish the arc generated when the two static arc-striking angles are connected or disconnected by the arc contact system; the transmission assembly is constructed to transmit the power of the moving contact system when closing and opening the moving contact system to the arc contact system, so that the connection between the arc contact system and the two static arc-striking angles takes precedence over the connection between the static contact system and the moving contact system The connection between the contact systems makes the disconnection between the arc contact system and the two static arc-striking angles lag behind the disconnection between the static contact system and the moving contact system; the transmission assembly is detachably connected to the moving contact system, the transmission assembly is detachably connected to the arc contact system, or the transmission assembly itself can be disassembled into two parts, one part is connected to the arc contact system, and the other part is connected to the moving contact system, and the transmission assembly is arranged outside the electrical switch housing; the arc extinguishing assembly, the two static arc-striking angles, and the arc contact system are arranged in the housing; the static contact system and the moving contact system are both connected to the electrical switch housing, the static contact of the static contact system is arranged in the electrical switch housing, and the housing is detachably plugged into the upper part of the electrical switch housing.

[0007] Compared with the prior art, the present invention has achieved the following technical effects:

[0008] The arc extinguishing system in the electrical switch provided by the present invention is completely isolated from the main contact system, so that the arc is only generated and eliminated inside the arc extinguishing system, preventing the arc from damaging the conductive system of the electrical switch, thereby improving the safety, reliability and service life of the electrical switch. At the same time, the arc extinguishing system is detachably connected to the moving contact system through a transmission component. When the arc extinguishing system in the electrical switch needs to be replaced due to arc erosion, the arc extinguishing system can be directly disassembled and replaced without having to disassemble the electrical switch for maintenance or replace the entire electrical switch, which greatly shortens the maintenance time and saves maintenance costs. Secondly, the transmission component is arranged outside the electrical switch housing, which is convenient for the staff to remove the arc extinguishing system from the electrical switch housing, or reinstall it on the electrical switch housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 This is a schematic diagram of the overall structure of an electrical switch according to an embodiment of the present invention (excluding the operating mechanism);

[0011] Figure 2 The isometric view of the embodiment of the present invention after removing the switch housing of the electrical appliance Figure 1 ;

[0012] Figure 3 The isometric view of the embodiment of the present invention after removing the switch housing of the electrical appliance Figure 2 ;

[0013] Figure 4 The isometric view of the embodiment of the present invention after removing the switch housing of the electrical appliance Figure 3 ;

[0014] Figure 5 This is a left view of the embodiment of the present invention in an open state after the electrical switch housing is removed;

[0015] Figure 6 It is a right view of the embodiment of the present invention in the open state after the electrical switch housing is removed;

[0016] Figure 7 This is a left view of the embodiment of the present invention in a closed state after the electrical switch housing is removed;

[0017] Figure 8 It is a right side view of the embodiment of the present invention in a closed state after the housing of the electrical switch is removed;

[0018] Fig. 9 a, b, c, and d are respectively the right, front, left, and top views of the arc extinguishing system in an embodiment of the present invention;

[0019] Fig.10 An axonometric diagram of an arc extinguishing system in an embodiment of the present invention;

[0020] Fig.11 This is an axonometric diagram of the arc extinguishing system housing and the arc contact system in an embodiment of the present invention;

[0021] Fig.12 This is an axonometric diagram of the arc extinguishing system without the outer shell in an embodiment of the present invention;

[0022] Fig.13 for Fig.12 Axonometric view of the other side;

[0023] Fig.14 This is an axonometric diagram of the coordination between the arc contact system and the dynamic and static arc striking angles in an embodiment of the present invention;

[0024] Fig.15 This is a front view of the arc extinguishing system with the outer shell removed in an embodiment of the present invention;

[0025] Fig.16 A top view of the arc extinguishing system with the outer shell removed in an embodiment of the present invention;

[0026] Fig.17 This is an axonometric diagram of the arc extinguishing system after removing one side of the housing in an embodiment of the present invention;

[0027] Fig.18 a, b, and c are respectively the right, main, and left views of the arc extinguishing chamber in the embodiment of the present invention;

[0028] Fig.19 An axonometric diagram of an arc extinguishing system in an embodiment of the present invention;

[0029] Fig. 20 In the embodiment of the present invention, the arc extinguishing system Fig.19 Axonometric drawing in the other direction;

[0030] Fig.21 This is an axonometric diagram of the arc extinguishing system after removing the arc isolation walls on both sides in an embodiment of the present invention;

[0031] Fig. 22 In the embodiment of the present invention, Fig.21 Axonometric drawing in the other direction;

[0032] Fig.23 This is an axonometric diagram of the arc extinguishing chamber after removing the arc-isolating walls on both sides and the left and right baffles in the embodiment of the present invention;

[0033] Fig.24 This is an axonometric diagram of the arrangement of arc extinguishing grids in an embodiment of the present invention;

[0034] Fig.25 a, b, respectively, are a front view and a top view of the left and right baffles in an embodiment of the present invention;

[0035] Fig.26 This is an axonometric view of the left and right baffles in an embodiment of the present invention;

[0036] Fig. 27 a, b, respectively, are a front view and a left view of the arc contact system in an embodiment of the present invention;

[0037] Fig.28 This is a plan view of the arc contact system after removing one side of the housing in the embodiment of the present invention;

[0038] Fig.29 This is an axonometric diagram of an arc contact system after removing one side of the housing in an embodiment of the present invention;

[0039] Fig.30 This is an axonometric diagram of the housing of the arc contact system in an embodiment of the present invention;

[0040] Fig.31 A cross-sectional view of the gap between adjacent arc-extinguishing grids in an arc-extinguishing chamber and a schematic diagram of the arc gas flow direction in an embodiment of the present invention;

[0041] Fig.32 A schematic diagram of airflow movement and direction in an arc extinguishing system in an embodiment of the present invention;

[0042] Fig.33 This is a schematic diagram of the opening position of an electrical switch according to an embodiment of the present invention;

[0043] Fig.34 It is a schematic diagram of an arc contact of an electrical switch according to an embodiment of the present invention and a static arcing angle being in a critical contact position;

[0044] Fig.35 It is a schematic diagram of a moving contact and a stationary contact system of an electrical switch in an embodiment of the present invention being in a critical contact position;

[0045] Fig.36 This is a schematic diagram of the closing position of the electrical switch of an embodiment of the present invention;

[0046] Fig.37 In the process of opening the electrical switch of the embodiment of the present invention, Fig.34 Schematic diagram of the current path of the state;

[0047] Fig.38 This is a schematic diagram of the current and arc path at the initial stage of opening the electrical switch according to an embodiment of the present invention;

[0048] Fig.39 A schematic diagram of the current and arc path in the middle of opening the electrical switch according to an embodiment of the present invention;

[0049] Fig.40 It is a schematic diagram of the current and arc path at the end of opening of the electrical switch according to an embodiment of the present invention.

[0050] Among them, 1-electrical switch housing; 2-rotating shaft; 3-connecting rod 1; 4-connecting rod 2; 5-connecting rod 3; 6-axis; 7-bracket 1; 8-bracket 2; 9-pin shaft 1; 10-pin shaft 2; 11-arc extinguishing system; 12-moving contact system; 13-connecting rod 4; 14-pin shaft 3; 15-static contact system; 16-moving connecting wire; 17-static connecting wire; 18-contact support; 19-moving contact; 20-moving contact silver point; 21-static contact silver point; 22-screw; 23-arc contact housing; 24-rivet; 25-arc contact; 26-arc contact silver point; 27-groove structure; 28-spring positioning groove; 29-slide rail; 3 0-spring mounting slot; 31-arc contact spring; 32-upper exhaust hole; 33-housing; 34-static connection point; 35-moving connection point; 36-blocking structure; 37-enclosed chamber; 38-arc contact system; 39-arc extinguishing chamber; 40-arc extinguishing grid; 41-arc absorbing structure; 42-static arc striking angle; 43-moving arc striking angle; 44-static arc striking silver point; 45-arc striking notch; 46-grid exhaust cutout; 47-chamfered structure; 48-arc isolation wall; 49-left baffle; 50-right baffle; 51-narrow slit structure; 52-exhaust hole; 53-exhaust cutout; 54-rotation center axis of the shaft; 55-rotation center axis of the moving contact system. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] Combine the following Figures 1 to 40 , describing an embodiment of the present invention.

[0054] The embodiment of the present invention provides an electrical switch, such as Figures 1 to 8As shown, it includes a static contact system 15, a moving contact system 12, an electrical switch housing 1 and an arc extinguishing system 11, and the arc extinguishing system 11 includes: two static arc-striking angles 42, an arc contact system 38, an arc extinguishing assembly, a transmission assembly and a housing 33; the two static arc-striking angles 42 are electrically connected to the static contact system 15 and the moving contact system 12 respectively; the arc contact system 38 is used to contact the two static arc-striking angles 42 and realize the conduction between the two, and to be used to stay away from the two static arc-striking angles 42 and realize the disconnection between the two; the arc extinguishing assembly is constructed to extinguish the arc generated when the two static arc-striking angles 42 are connected or disconnected through the arc contact system 38; the transmission assembly is constructed to transmit the power of the moving contact system 12 when closing and opening to the arc contact system 38, so that the connection between the arc contact system 38 and the two static arc-striking angles 42 is excellent. The connection between the static contact system 15 and the moving contact system 12 is preceded by the connection between the arc contact system 38 and the two static arc-strike angles 42, so that the disconnection between the arc contact system 38 and the two static arc-strike angles 42 lags behind the disconnection between the static contact system 15 and the moving contact system 12; the transmission component is detachably connected to the moving contact system 12, the transmission component is detachably connected to the arc contact system 38, or the transmission component itself can be disassembled into two parts, one part is connected to the moving contact system 12, and the other part is connected to the moving contact system 12, and the transmission component is arranged outside the electrical switch housing 1; the arc extinguishing component, the two static arc-strike angles 42, and the arc contact system 38 are arranged in the housing 33; the static contact system 15 and the moving contact system 12 are both connected to the electrical switch housing 1, the static contact of the static contact system 15 is arranged in the electrical switch housing 1, and the housing 33 is detachably plugged into the upper part of the electrical switch housing 1.

[0055] Specifically, the top of the electrical switch housing 1 is open, and the lower part of the arc extinguishing system 11 can be detachably inserted into the electrical switch housing 1 through the top opening. The upper part of the arc extinguishing system 11 extends from the top opening of the electrical switch housing 1 to the outside of the electrical switch housing 1. The arc contact system 38 is slidably arranged in the housing 33 along the vertical direction. A shaft 6 is connected to the arc contact system 38, and the end of the shaft 6 extends from the housing 33. The moving contact system 12 drives the shaft 6 to move vertically through the transmission assembly and drives the arc contact system 38 to move up and down.

[0056] The arc extinguishing system 11 in the electrical switch provided by the present invention is completely isolated from the main contact system, so that the arc is only generated and eliminated inside the arc extinguishing system 11, preventing the arc from damaging the conductive system of the electrical switch, thereby improving the safety, reliability and service life of the electrical switch. At the same time, the arc extinguishing system 11 is detachably connected to the moving contact system 12 through a transmission component. When the arc extinguishing system 11 in the electrical switch needs to be replaced due to arc erosion, the arc extinguishing system 11 can be directly disassembled and replaced without disassembling the electrical switch for maintenance or replacing the entire electrical switch, which greatly shortens the maintenance time and saves maintenance costs. Secondly, the transmission component is arranged outside the electrical switch housing 1, which is convenient for the staff to remove the arc extinguishing system 11 from the electrical switch housing 1, or reinstall it on the electrical switch housing 1.

[0057] In some embodiments, such as Figure 2 and Figure 3 As shown, among the two static arc-starting angles 42, one static arc-starting angle 42 is electrically connected to the static contact system 15 through a static connecting line 17; the other static arc-starting angle 42 is electrically connected to the moving contact system 12 through a moving connecting line 16; at least the moving connecting line 16 is configured as a flexible conductor, which can be arbitrarily twisted according to the position of the moving contact system 12 to ensure reliable electrical connection. Of course, the static connecting line 17 can be a rigid conductor or a flexible conductor.

[0058] In some embodiments, the arc contact system 38 is slidably disposed in the housing 33, and the arc contact system 38 has two arc contact silver points 26, and static arc-starting silver points 44 are disposed on the two static arc-starting angles 42, and the two static arc-starting silver points 44 are respectively on the moving tracks of the two arc contact silver points 26. Under normal conditions, the distance between one arc contact silver point 26 and one static arc-starting silver point 44 is the same as the distance between another arc contact silver point 26 and another static arc-starting silver point 44. This embodiment achieves the purpose of connecting the arc contact system 38 and the two static arc-starting silver points 44 at the same time.

[0059] The connecting rod mechanism has many deformation examples, and the present invention only illustrates one example, as follows: the transmission assembly includes connecting rod 1 3, connecting rod 2 4 and connecting rod 3 5, and the moving contact system 12 has a rotating shaft 2 and a moving contact 19; the moving contact 19 is installed on the rotating shaft 2, and the rotating shaft 2 is driven by the operating mechanism to rotate around its own axis and drive the moving contact 19 to approach and move away from the static contact in the static contact system 15; one end of the connecting rod 1 3 is fixedly connected to the rotating shaft 2, and the other end is detachably hinged to the connecting rod 2 4 through a pin shaft, and the hinge is located outside the electrical switch housing 1, and the connecting rod 3 5 is bent at a right angle. Among the two rod structures of the connecting rod 3 5, one is vertically arranged and the other is horizontally arranged; the free end of the vertically arranged rod structure is hinged to the connecting rod 3 5, and the free end of the horizontally arranged rod structure is hinged to the shaft 6, and the connecting rod 3 5 is vertically slidably connected to the housing 33 and only has the freedom of vertical sliding.

[0060] This embodiment achieves the purpose of driving the arc contact to move up and down by the rotating shaft 2 of the moving contact system 12 .

[0061] In some embodiments, multiple moving contact systems 12, static contact systems 15, and arc extinguishing systems 11 are provided, one arc extinguishing system 11 corresponds to one moving contact system 12 and one static contact system 15, multiple moving contact systems 12 share one rotating shaft 2, shaft 6 passes through multiple arc extinguishing systems 11 in sequence, and both ends extend from the housings 33 of the arc extinguishing systems 11 on both sides, multiple arc extinguishing systems 11 share two transmission components, and one end of the two transmission components is connected to both ends of the shaft 6 for transmission. This embodiment achieves the purpose of closing and opening multiple moving contacts 19 and static contacts at the same time.

[0062] In some embodiments, the arc extinguishing assembly includes two arc extinguishing chambers 39, two static arc-starting silver points 44 are respectively arranged on the arc-entry sides of the two arc extinguishing chambers 39, the arc contact silver point 26 is always located directly above the static arc-starting silver point 44, the arc-entry sides of the two arc extinguishing chambers 39 are arranged opposite to each other, there is a gap between the two arc extinguishing chambers 39, the arc contact system 38 is arranged in the gap, and the shaft 6 passes through the gap; the arc contact system 38 includes an arc contact housing 23, an arc contact 25, an arc contact spring 31, and an arc contact outer The shell 23 is slidably disposed in the shell 33 along the vertical direction, the middle part of the arc contact 25 is slidably disposed in the arc contact shell 23 along the vertical direction, the two ends of the arc contact 25 extend from the two sides of the arc contact shell 23, and the bottom surfaces of the two ends of the arc contact 25 are fixedly provided with arc contact silver points 26; an arc contact spring 31 is disposed in the arc contact shell 23 above the arc contact 25, and in the open state, the top of the arc contact spring 31 is against the bottom of the arc contact 25 and is in a normal or compressed state. One end of the arc contact spring 31 is placed in the spring installation groove 30 in the arc contact shell 23, and the other end is placed in the spring positioning groove 28 of the arc contact 25.

[0063] In some embodiments, a barrier structure 36 is provided on the arc-entry side of the arc-extinguishing assembly, and the barrier structure 36 and the arc contact system 38 together isolate the two arc-extinguishing chambers 39 .

[0064] In some embodiments, the arc extinguishing chamber 39 includes two arc-isolating walls 48, an arc-extinguishing grid 40, a left baffle 49 and a right baffle 50; the two arc-isolating walls 48 are arranged opposite to each other and at an interval, the arc-extinguishing grid 40 is placed horizontally, and the two sides are riveted to the arc-isolating walls 48 on both sides, and multiple arc-extinguishing grids 40 are arranged in sequence along the longitudinal direction; the static arc-strike angle 42 adopts a multiple bending structure, a static arc-strike silver point 44 is welded on the bending plane at one end, and the bending plane at the other end is located at the lower part of the lowest arc-extinguishing grid 40 and riveted to the arc-isolating walls 48 on both sides, and a dynamic arc-strike angle 43 is also arranged in the shell 33. The dynamic arc-strike angle 43 adopts a multiple bending structure, one end is a V-shaped or U-shaped bending structure, and the bending plane at the other end is located at the upper part of the uppermost arc-extinguishing grid 40 and riveted to the arc-isolating walls 48 on both sides. When the arc contact system 38 is in the open state, the arc contact 25 is connected to the V-shaped or U-shaped bending structure.

[0065] In some embodiments, the arc contact housing 23 is disposed between the two arc extinguishing chambers 39 , and the bottom of the arc contact housing 23 is always lower than the static arc striking silver point 44 , and the top is always higher than the lowest part of the dynamic arc striking angle 43 .

[0066] In some embodiments, the connecting rod 3 5 is slidably connected to the housing 33 and the outside of the electrical switch housing 1 through a bracket fixedly disposed on the housing 33 and / or the outside of the electrical switch housing 1 .

[0067] Specific: such as Figure 1 to Figure 4As shown, the electrical switch in the embodiment of the present invention mainly includes an electrical switch housing 1, a moving contact system 12, a stationary contact system 15, an arc extinguishing system 11, a transmission assembly and an operating mechanism (omitted in the figure). The operating mechanism can drive the rotating shaft 2 to rotate around the rotating shaft center axis 54 to realize the opening and closing actions of the electrical switch. The arc extinguishing system 11 adopts a closed modular structure to electrically isolate it from the conductive system composed of the moving contact system 12 and the stationary contact system 15.

[0068] like Figures 9 to 13 As shown, the arc extinguishing system 11 includes a housing 33, an arc contact system 38, and an arc extinguishing chamber 39. The housing 33 completely encloses the arc contact system 38 and the arc extinguishing chamber 39. Fig.11 As shown, the housing 33 has a baffle structure 36 inside, which cooperates with the arc contact system 38 to restrict the arc contact system 38 in the closed chamber 37, and the arc contact system 38 can slide freely longitudinally within a certain range in the closed chamber 37. The shaft 6 passes through the shaft hole structure of the housing to drive the arc contact system 38 to achieve the opening and closing action. The baffle structure 36 cooperates with the arc contact system 38 to divide the space on both sides of the arc contact system 38 to form two independent chambers, and the arc extinguishing chamber 39 is respectively placed in these two independent chambers.

[0069] like Figure 27 to Figure 30 As shown, the arc contact system 38 includes an arc contact housing 23, an arc contact 25, an arc contact silver point 26, and an arc contact spring 31. The arc contact 25 and the arc contact spring 31 are fixed in the arc contact housing 23 by rivets 24. The arc contact 25 has a groove structure 27, which is clearance-matched with the slide rails 29 of the arc contact housing 23 on both sides, so that it can slide freely longitudinally within a certain range under the restriction of the slide rails 29, meeting the overtravel requirement of the arc contact 25 after closing; due to the clearance fit, the arc contact 25 can also move around the vertical Fig.28 The axis of the viewing direction rotates within the range of ±5° to supplement the unilateral overtravel to prevent the arc contact silver points 26 on both sides from contacting asynchronously, causing one side to be energized. Arc contact silver points 26 are welded on both sides of the arc contact 25. One end of the arc contact spring 31 is placed in the spring installation groove 30, and the other end is placed in the spring positioning groove 28 of the arc contact 25, so as to limit the arc contact spring 31 and make the force-bearing surface of the arc contact 25 evenly stressed.

[0070] like Figure 18 to Figure 22 As shown, the arc extinguishing chamber 39 includes arc-isolating walls 48 on both sides, arc extinguishing grids 40, a left baffle 49, and a right baffle 50. The left baffle 49 and the right baffle 50 wrap the front ends of the arc extinguishing grids 40, and extend into the gaps between the arc extinguishing grids 40 respectively, and cooperate with the dynamic arc-strike angle 43 and the static arc-strike angle 42 to form a narrow slit structure 51 on the arc-entry side of the arc extinguishing chamber 39, and form staggered exhaust holes 52 on the arc-exiting side of the arc extinguishing chamber 39.

[0071] like Figure 14-15and Fig.23 As shown, the static arc-starting angle 42 is a multiple-bending structure, and the upper bending platform is welded with a static arc-starting silver point 44, which can contact the arc contact silver point 26 when the arc contact system 38 is closed to connect the current. The other end of the static arc-starting angle 42 is bent and extended to the lower part of the lowermost arc-extinguishing grid 40. The dynamic arc-starting angle 43 adopts a multiple-bending mechanism, and one end is bent into a "U"-shaped bending structure. When the arc contact system 38 is in or close to the opening position, it can directly electrically contact or maintain a small distance with the arc contact 25, so that the two are directly electrically connected or easily form an arc jump.

[0072] like Figures 16-17 and Fig.24 As shown, the arc extinguishing grid 40 at the corresponding position of the opening and closing path of the arc contact 25 has an arc absorbing structure 41. The arc absorbing structure 41 is arranged on both sides of the moving path of the arc contact 25 when it performs the opening and closing action. When an arc is generated during the opening process of the arc contact system 38, the magnetic blowing effect is enhanced to attract the arc, so that the arc enters the arc extinguishing chamber 39 more quickly.

[0073] like Figure 24 to Figure 26 As shown, the arc-out side ends of the left baffle 49 and the right baffle 50 have chamfer structures 47 and exhaust cutouts 53 on both sides of the arc-out ends. Similarly, the arc-out ends of the arc-extinguishing grid 40 have corresponding grid exhaust cutouts 46 on both sides.

[0074] like Fig.31 The figure shows a cross-sectional view of the gap between adjacent arc-extinguishing grids 40 and a schematic diagram of the arc gas flow direction. As shown in the figure, under the action of the chamfer structure 47, the arc and high-temperature gas are deflected in the direction of the arrow in the figure, and the angle between the gas flow discharge directions of two adjacent exhaust holes 52 is 90° to 150°. The arc-starting notch 45 of the arc-extinguishing grid 40 is consistent with the gas flow discharge direction of the corresponding exhaust hole 52.

[0075] like Fig.32 As shown, an exhaust passage consisting of an exhaust cutout 53 and a grid exhaust cutout 46 is formed between the arc extinguishing chamber 39 and the housing 33, and the high-temperature gas discharged from the exhaust hole 52 moves through the exhaust passage according to the airflow movement path and direction shown in the figure. Fig.11 and Fig.17 As shown, the top of the housing 33 has an upper exhaust hole 32 , the position of which corresponds to the position of the exhaust cutout 53 . The high-temperature gas passes through the exhaust channel and is finally discharged from the arc extinguishing system 11 from the upper exhaust hole 32 .

[0076] like Fig. 9 , Fig.10 and Fig.14As shown, two static arc-starting angles 42 extend terminal structures to the front and rear positions of the housing 33, one of which is a static connection point 34, and is electrically connected to the static contact system 15 through a static connection line 17, and the static connection line 17 is wrapped with insulation on the outside; the other terminal is a dynamic connection point 35, which is electrically connected to the dynamic contact system 12 through a dynamic connection line 16, and the dynamic connection line 16 is a flexible connection line, and is wrapped with insulation on the outside. The static connection line 17 and the dynamic connection line 16 are located on both sides of the arc extinguishing system 11 and are embedded in the groove of the housing 33. The housing 33 has a long hole structure corresponding to the movement path of the shaft hole of the arc contact system 38. The shaft 6 moves longitudinally in the long hole structure to drive the arc contact system 38 to complete the opening and closing action.

[0077] like Figure 1 to Figure 4 As shown, the moving contact system 12 includes components such as a contact support 18 and a moving contact 19. When performing an opening or closing operation, the operating mechanism (omitted in the figure) drives the rotating shaft 2 to rotate around the rotating shaft rotation center axis 54. The rotating shaft 2 is connected to the connecting rod 4 13 through the pin shaft 3 14. When performing an opening and closing operation, the rotating shaft 2 rotates around the rotating shaft rotation center axis 54, pushing the connecting rod 4 13 to rotate relative to the pin shaft 3 14 as the axis. The connecting rod 4 13 pushes the contact support 18, so that the moving contact system 12 rotates around the moving contact system rotation center axis 55, thereby realizing the opening and closing action of the moving contact system 12 relative to the static contact system 15.

[0078] The connecting rod 1 3 is completely welded and fixed to the rotating shaft 2, and the connecting rod 1 3 is connected to the connecting rod 2 4 through the pin shaft 1 9. The connecting rod 3 5 adopts an "L"-shaped bending structure, and the connecting rod 2 4 is connected to one end of the connecting rod 3 5 through the pin shaft 2 10. The longitudinal arm of the connecting rod 3 5 passes through the bracket 1 7, and the bracket 1 7 is fixed to the electrical switch housing 1. Under the limiting effect of the bracket 1 7, the connecting rod 3 5 can only move in one degree of freedom in the longitudinal direction. The bracket 2 8 is fixed to the electrical switch housing 1, and the transverse arm of the connecting rod 3 5 passes through the bracket 2 8 to prevent the connecting rod 3 5 from deflecting in other directions during the movement. The other end of the connecting rod 3 5 passes through the shaft 6, and the shaft 6 passes through the arc contact system 38 of all arc extinguishing systems 11. When the rotating shaft 2 is opened and closed, each connecting rod is driven to move, and finally the connecting rod 3 5 moves longitudinally, driving the arc contact system 38 to move longitudinally, and completing the opening and closing action of the arc contact system 38 relative to the static arc striking angle 42.

[0079] like Figure 5-6 , is a schematic diagram of the positions of various components in the open state. At this time, the moving contact system 12 rotates to the maximum distance from the static contact system 15, and the connecting rod 3 5 moves to the highest point in the longitudinal direction.

[0080] like Figure 7-8 , is a schematic diagram of the positions of various components in the closed state. At this time, the moving contact system 12 rotates to completely fit with the static contact system 15 and reaches the overtravel position, and the connecting rod 3 5 moves to the lowest point in the longitudinal direction.

[0081] Since the moving connecting wire 16 adopts a flexible connection, it can be bent at will according to different positions of the moving contact system 12, thereby ensuring a reliable electrical connection state.

[0082] The working principle of the present invention is as follows:

[0083] like Fig.33 FIG. 1 is a schematic diagram of the opening position of an electrical switch according to an embodiment of the present invention.

[0084] At this time, the rotating shaft 2 rotates clockwise to the extreme position, pulling the connecting rod four 13 to rotate relatively, so that the moving contact system 12 rotates counterclockwise to the extreme position with the moving contact system rotation center axis 55 as the axis; at the same time, the connecting rod 1 3 rotates clockwise to the extreme position together with the rotating shaft 2, pulling the connecting rod two 4, pushing the connecting rod three 5 to move to the highest point in the longitudinal direction, and at the same time pushing the shaft 6 to drive the arc contact system 38 to move to the highest point in the longitudinal direction, reaching the opening state, at this time, the two sides of the arc contact 25 are directly electrically contacted with the moving arc striking angles 43 on both sides or maintain a small distance.

[0085] like Fig.34 , which is a schematic diagram of an arc contact of an electrical switch in an embodiment of the present invention and a static arcing angle being in a critical contact position.

[0086] Compared to Fig.33 In the state shown, the rotating shaft 2 rotates counterclockwise, causing the electrical switch to move to the closed position. The rotating shaft 2 pushes the connecting rod 4 13 to rotate relatively, causing the moving contact system 12 to rotate clockwise toward the static contact system 15 with the moving contact system rotation center axis 55 as the axis; at the same time, the connecting rod 1 3 rotates counterclockwise with the rotating shaft 2, pulling the connecting rod 2 4, causing the connecting rod 3 5 to move downward in the longitudinal direction, and at the same time pulling the shaft 6 to drive the arc contact system 38 to move downward in the longitudinal direction. When the arc contact system 38 moves to the point where the arc contact silver point 26 just touches the static arc striking silver point on the static arc striking angle 42, the arc contact 25 begins to conduct with the static arc striking angles 42 on both sides. At this time, the moving contact silver point 20 of the moving contact 19 and the static contact silver point 21 of the static contact system 15 have not yet touched, and there is an electrical gap of more than 2mm.

[0087] like Fig.35 , which is a schematic diagram of the movable contact and the stationary contact system of the electrical switch in the embodiment of the present invention being in a critical contact position.

[0088] Compared to Fig.34In the state shown, the rotating shaft 2 rotates counterclockwise, and the electrical switch continues to move to the closed position. The rotating shaft 2 pushes the connecting rod 4 13 to rotate relatively, so that the moving contact system 12 rotates clockwise toward the static contact system 15 with the moving contact system rotation center axis 55 as the axis. At this time, the moving contact silver point 20 of the moving contact 19 begins to contact the static contact silver point 21 of the static contact system 15, and the main conductive system composed of the moving contact system 12 and the static contact system 15 begins to conduct; at the same time, the connecting rod 1 3 rotates counterclockwise with the rotating shaft 2, pulling the connecting rod 2 4, so that the connecting rod 3 5 continues to move downward in the longitudinal direction, and at the same time pulls the shaft 6 to drive the arc contact system 38 to continue to move downward in the longitudinal direction. At this time, the arc contact spring 31 continues to be compressed.

[0089] like Fig.36 FIG. 1 is a schematic diagram of the closing position of the electrical switch according to an embodiment of the present invention.

[0090] Compared to Fig.35 In the state shown, the rotating shaft 2 rotates counterclockwise to the limit position, and the rotating shaft 2 pushes the connecting rod 4 13 to rotate relatively, so that the moving contact system 12 rotates clockwise to the static contact system 15 to the limit position with the moving contact system rotation center axis 55 as the axis, reaching the overtravel position of the moving contact 19, so that the main conductive system composed of the moving contact system 12 and the static contact system 15 is reliably contacted. At the same time, the connecting rod 1 3 rotates counterclockwise with the rotating shaft 2, pulling the connecting rod 2 4, so that the connecting rod 3 5 continues to move downward in the longitudinal direction, and at the same time pulls the shaft 6 to drive the arc contact system 38 to continue to move downward in the longitudinal direction. At this time, the arc contact spring 31 is compressed to the limit position.

[0091] As above, Fig.33 → Fig.34 → Fig.35 → Fig.36 The sequence is the sequence of the electrical switch from the open state to the closed state. When the electrical switch is in the open state, Fig.36 → Fig.35 → Fig.34 → Fig.33 It can be seen that, through the matching of the sizes of the connecting rods, when the shaft 2 rotates in the closing direction, the connection between the arc contact system 38 and the static arcing angle 42 takes precedence over the connection between the moving contact system 12 and the static contact system 15; when the shaft 2 rotates in the opening direction, the disconnection between the arc contact system 38 and the static arcing angle 42 lags behind the disconnection between the moving contact system 12 and the static contact system 15.

[0092] When the electrical switch is closed with load or closed with power on in a short-circuit state on the load side, and when the electrical switch is opened with load or when the fault current is interrupted, due to the closing-before-opening characteristic of the arc contact system 38, and when the arc contact system 38 is at the critical point of closing and opening, there is a sufficient electrical gap between the moving contact system 12 and the static contact system 15, and the two static arc-starting angles 42 in the arc extinguishing system 11 are electrically connected to the moving contact system 12 through the moving connecting line 16 and to the static contact system 15 through the static connecting line 17, so that the arc is only generated between the arc contact system 38 in the arc extinguishing system 11 and the static arc-starting angles 42 on both sides, and the arc extinguishing system 11 is electrically isolated from the moving contact system 12 and the static contact system 15, so as to prevent the arc from causing erosion to the main conductive system composed of the moving contact system 12 and the static contact system 15, thereby greatly improving the service life of the electrical switch.

[0093] like Fig.37 The figure shows the process of the electrical switch breaking current. Fig.34 Schematic diagram of the current path in the state. At this time, the rotating shaft 2 rotates clockwise, causing the moving contact system 12 to rotate counterclockwise with the moving contact system rotation center axis 55, and the moving contact silver point 20 of the moving contact system 12 is separated from the static contact silver point 21 of the static contact system 15 and the distance gradually increases. Although the rotation of the rotating shaft 2 causes the connecting rod 35 to move upward in the longitudinal direction, driving the shell of the arc contact system 38 to move upward in the longitudinal direction, and the arc contact spring 31 is gradually released from the compressed state, the spring pressure can still overcome the Holm force and provide sufficient contact pressure to the arc contact 25, so that the arc contact 25 and the static arc-starting angles 42 on both sides maintain a reliable contact and conduction state, and no arc is generated between the moving contact silver point 20 and the static contact silver point 21. The current path is shown in the figure, which is moving contact 19→moving connecting line 16→static arc-starting angle 42 (left)→arc contact 25→static arc-starting angle 42 (right)→static connecting line 17→static contact system 15.

[0094] like Fig.38 As shown, it is a schematic diagram of the current and arc path at the initial stage of opening the electrical switch of an embodiment of the present invention. The rotating shaft 2 continues to rotate clockwise, causing the moving contact system 12 to rotate counterclockwise about the moving contact system rotation center axis 55, and the moving contact 19 of the moving contact system 12 continues to move away from the static contact system 15. The rotation of the rotating shaft 2 causes the connecting rod 35 to move upward in the longitudinal direction, driving the outer shell of the arc contact system 38 to continue to move upward in the longitudinal direction, and the arc contact spring 31 continues to release until the bottom of the arc contact 25 contacts the arc contact outer shell 23. Then, the arc contact 25 moves upward in the longitudinal direction together with the arc contact outer shell 23. At this time, the arc contact 25 is separated from the static arc striking angles 42 on both sides, and an arc is generated between the two, as shown in the figure. This initial arc quickly enters the arc extinguishing chamber 39 under the magnetic blowing action of the arc absorbing structure 41 of the arc extinguishing grid 40. The specific magnetic field direction can be referred to. Fig.39Since the arc is generated at the narrow slot structure 51, the left baffle 49 and the right baffle 50 on both sides of the narrow slot structure are made of gas-generating composite materials, which are cracked to generate small molecule vapor under the high temperature of the arc to cool the arc; at the same time, the narrow slot structure 51 can limit and compress the arc column diameter, and the closed structure at the arc contact system 38 can prevent gas backflow, so as to promote the arc and gas to move into the arc extinguishing chamber 39.

[0095] like Fig.39 As shown in the figure, it is a schematic diagram of the current and arc path in the middle stage of the opening of the electrical switch of the embodiment of the present invention. The rotating shaft 2 continues to rotate clockwise, so that the moving contact system 12 rotates counterclockwise about the moving contact system rotation center axis 55, and the moving contact 19 of the moving contact system 12 continues to move away from the static contact system 15. The rotation of the rotating shaft 2 causes the connecting rod 35 to move upward in the longitudinal direction, driving the arc contact system 38 to move upward in the longitudinal direction as a whole. At this time, the arc is accelerated into the arc extinguishing chamber 39 under the combined action of air blowing and magnetic blowing, and the direction of the magnetic field is shown in the figure. Regardless of the direction of the current, the induced magnetic field Lorentz force received by the arc is directed to the inside of the arc extinguishing chamber 39. The distance between the two sides of the arc contact 25 and the "U"-shaped bending part of the moving arc ignition angle 43 on both sides is close, and the arc jumps to the moving arc ignition angle 43 and stretches upward under the action of its bending structure; as the arc moves into the inside of the arc extinguishing chamber 39, the bending structure of the static arc ignition angle 42 stretches the arc downward. As the arc length increases, the number of arc extinguishing grids 40 that cut the arc also increases, gradually improving the arc extinguishing effect of the arc extinguishing chamber 39 on the arc.

[0096] like Fig.40 The figure shows a schematic diagram of the current and arc path at the end of the opening of the electrical switch according to an embodiment of the present invention. At this time, the moving contact system 12 opens to the limit position, and the arc contact system 38 rises to the limit position. At this time, the two sides of the arc contact 25 are in direct electrical contact with the moving arc-starting angles 43 on both sides or maintain a small distance, so that the arc contact 25 is directly electrically connected to the moving arc-starting angles 43 on both sides or the current is conducted through arc jumping. Under the action of air blowing and magnetic blowing, the arc is elongated under the action of the moving arc-starting angle 43 and the static arc-starting angle 42, and is cut and cooled by the arc extinguishing grid 40 until the arc is extinguished. Due to the use of a double breakpoint structure, single-phase voltage is applied to two groups of contacts in series, and each group of contacts only bears 1 / 2 of the single-pole voltage, reducing contact damage; at the same time, the arc is divided into two parts and is elongated at the same time, entering two arc extinguishing chambers 39 for ionization, which quickly increases the arc voltage, suppresses short-circuit energy, and improves the breaking capacity of the circuit breaker. Residual arc and high-temperature gas pass through Fig.32 The airflow movement path shown is to exhaust the arc extinguishing system 11 through the upper exhaust hole 32 on the shell 33 of the arc extinguishing system 11.

[0097] The present invention also provides another embodiment. In this embodiment, the connecting rods are replaced by gate wires, the static arcing angle 42 is moved to the upper side, and the dynamic arcing angle 43 is moved to the lower side, that is, the arc contact system 38 moves upward for closing, and moves downward for opening. During the opening action, the rotating shaft 2 drives the connecting rod 1 3 to move clockwise, pulls the gate wire, and drives the connecting rod 3 5 to move downward in the longitudinal direction, so as to realize the rapid opening action of the arc contact system 38. During the closing action, the rotating shaft 2 drives the connecting rod 1 3 to move counterclockwise, the gate wire is relaxed, and the spring pushes the connecting rod 1 3 to move upward in the longitudinal direction, so as to realize the opening action of the arc contact system 38.

[0098] The present invention completely isolates the arc extinguishing system 11 from the moving contact system 12 and the static contact system 15, so that the arc is generated and extinguished only in the closed arc extinguishing system 11, preventing the arc from damaging the main conductive system of the electrical switch. At the same time, a connecting rod structure is adopted to interlock the arc contact 25 with the moving contact 19, so that the arc is more reliably generated only in the arc extinguishing system, greatly improving the safety, reliability and service life of the electrical switch. Since the arc extinguishing system 11 is connected to the electrical switch body only by screws 22, the screws on the moving connection point 35 and the static connection point 34, and the arc extinguishing system 11 adopts a modular integrated structure, it is convenient to directly replace the arc extinguishing system 11 after multiple disconnections, greatly reducing maintenance time and reducing operation and maintenance costs.

[0099] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An electrical switch, comprising a stationary contact system, a moving contact system, an electrical switch housing and an arc extinguishing system, characterized in that: The arc extinguishing system comprises: Two static arc-starting angles, the two static arc-starting angles are electrically connected to the static contact system and the moving contact system respectively; An arc contact system, used for contacting the two static arc striking angles to achieve conduction between the two, and for moving away from the two static arc striking angles to achieve disconnection between the two; An arc extinguishing assembly is configured to extinguish an arc generated when the two static arc striking angles are connected or disconnected by the arc contact system; a transmission assembly configured to transmit power during closing and opening of the moving contact system to the arc contact system, so that the connection between the arc contact system and the two static arc-strike angles takes precedence over the connection between the static contact system and the moving contact system, and the disconnection between the arc contact system and the two static arc-strike angles lags behind the disconnection between the static contact system and the moving contact system; the transmission assembly is detachably connected to the moving contact system, the transmission assembly is detachably connected to the arc contact system, or the transmission assembly itself is detachable into two parts, one part is connected to the arc contact system, and the other part is connected to the moving contact system, and the transmission assembly is arranged outside the housing of the electrical switch; and The outer shell, the arc extinguishing assembly, the two static arc striking angles, and the arc contact system are arranged in the outer shell; the static contact system and the moving contact system are both connected to the outer shell of the electrical switch, the static contact of the static contact system is arranged in the outer shell of the electrical switch, and the outer shell is detachable and plugged into the upper part of the outer shell of the electrical switch.

2. The electrical switch according to claim 1, characterized in that: The arc contact system is slidably arranged in the housing, and the arc contact system has two arc contact silver points. Static arc striking silver points are arranged on the two static arc striking angles, and the two static arc striking silver points are respectively on the moving tracks of the two arc contact silver points. Under normal circumstances, the distance between one arc contact silver point and one static arc striking silver point is the same as the distance between another arc contact silver point and another static arc striking silver point.

3. The electrical switch according to claim 2, characterized in that: The top of the electrical switch housing is open, and the lower part of the arc extinguishing system is detachably plugged into the electrical switch housing through the top opening. The upper part of the arc extinguishing system extends from the top opening of the electrical switch housing to the outside of the electrical switch housing. The arc contact system is slidably arranged in the housing along the vertical direction. A shaft is connected to the arc contact system, and the end of the shaft extends out of the housing. The moving contact system drives the shaft to move vertically through the transmission assembly and drives the arc contact system to move up and down.

4. The electrical switch according to claim 3, characterized in that: The transmission assembly includes connecting rod one, connecting rod two and connecting rod three, and the moving contact system has a rotating shaft and a moving contact; the moving contact is installed on the rotating shaft, and the rotating shaft is driven by the operating mechanism to rotate around its own axis and drive the moving contact to approach and move away from the static contact in the static contact system; one end of the connecting rod one is fixedly connected to the rotating shaft, and the other end is detachably hinged to the connecting rod two through a pin shaft, and the hinge is located outside the housing of the electrical switch, and the connecting rod three is bent at a right angle, and of the two rod structures of the connecting rod three, one is vertically arranged and the other is horizontally arranged; the free end of the vertically arranged rod structure is hinged to the connecting rod three, and the free end of the horizontally arranged rod structure is hinged to the shaft, and the connecting rod three is vertically slidably connected to the housing and only has the freedom of vertical sliding.

5. The electrical switch according to claim 4, characterized in that: The moving contact system, the static contact system and the arc extinguishing system are each provided with a plurality, one arc extinguishing system corresponds to one moving contact system and one static contact system, a plurality of the moving contact systems share a rotating shaft, the shaft passes through a plurality of the arc extinguishing systems in sequence, and both ends extend out from the outer casings of the arc extinguishing systems on both sides, a plurality of the arc extinguishing systems share two transmission assemblies, and one end of each of the two transmission assemblies is connected to both ends of the shaft for transmission.

6. The electrical switch according to claim 4, characterized in that: The arc extinguishing assembly includes two arc extinguishing chambers, the two static arc-striking silver points are respectively arranged on the arc-entry sides of the two arc extinguishing chambers, the arc contact silver point is always located directly above the static arc-striking silver point, the arc-entry sides of the two arc extinguishing chambers are arranged opposite to each other, there is a gap between the two arc extinguishing chambers, the arc contact system is arranged in the gap, and the shaft passes through the gap; the arc contact system includes an arc contact housing, an arc contact, and an arc contact spring, the arc contact housing is slidably arranged in the housing along the vertical direction, the middle part of the arc contact is slidably arranged in the arc contact housing along the vertical direction, the two ends of the arc contact extend from the two sides of the arc contact housing, and the bottom surfaces of the two ends of the arc contact are fixedly provided with arc contact silver points; the arc contact spring is arranged in the arc contact housing above the arc contact, and in the open state, the top of the arc contact spring is against the bottom of the arc contact and is in a normal or compressed state.

7. The electrical switch according to claim 6, characterized in that: The arc-entry side of the arc-extinguishing assembly is provided with a barrier structure, and the barrier structure and the arc contact system together isolate the two arc-extinguishing chambers.

8. The electrical switch according to claim 6, characterized in that: The arc extinguishing chamber comprises two arc-isolating walls, an arc-extinguishing grid, a left baffle and a right baffle; the two arc-isolating walls are arranged opposite to each other with an interval, the arc-extinguishing grid is placed horizontally, and the two sides are riveted to the arc-isolating walls on both sides respectively, and a plurality of arc-extinguishing grids are arranged in sequence along the longitudinal direction; the static arc-strike angle adopts a multiple bending structure, the static arc-strike silver point is welded on the bending plane at one end, and the bending plane at the other end is located at the lower part of the arc-extinguishing grid at the lower end and is riveted to the arc-isolating walls on both sides, and a dynamic arc-strike angle is also arranged in the shell, the dynamic arc-strike angle adopts a multiple bending structure, one end is a V-shaped or U-shaped bending structure, and the bending plane at the other end is located at the upper part of the arc-extinguishing grid at the upper end and is riveted to the arc-isolating walls on both sides, and when the arc contact system is in the open state, the arc contact is connected to the V-shaped or U-shaped bending structure.

9. The electrical switch according to claim 8, characterized in that: The arc contact housing is arranged between the two arc extinguishing chambers, the bottom of the arc contact housing is always lower than the static arc striking silver point, and the top is always higher than the lowest part of the dynamic arc striking angle.

10. The electrical switch according to claim 4, characterized in that: The connecting rod three is slidably connected to the housing and the outside of the electrical switch housing through a bracket fixedly arranged on the housing and / or the outside of the electrical switch housing.

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