Liquid expansion type automatic controller

Abstract

The utility model relates to a liquid expansion type automatic controller which comprises a body base internally provided with an assembly cavity, a diaphragm capsule is arranged in the assembly cavity, a capillary tube is connected to the diaphragm capsule, the capillary tube is connected with a temperature sensing cylinder, and a control assembly in trigger fit with the diaphragm capsule is arranged in the assembly cavity. The control assembly comprises a pair of extraction electrodes and a conductive bridge, the two ends of the conductive bridge are in sliding contact with the two extraction electrodes respectively, a push rod adjacent to or abutting against the lower side of the diaphragm capsule is further connected into the assembly cavity in a sliding mode, and an energy storage spring abuts against the position between the push rod and the conductive bridge. When the push rod is pushed by the diaphragm capsule expansion drum to move downwards, the energy storage spring is compressed, and when the relative positions of the two ends of the energy storage spring are changed, the electric bridge is pushed to bounce upwards through elastic potential energy, so that the electric bridge is separated from the extraction electrode to disconnect the control assembly. According to the liquid expansion type automatic controller, a spring structure is used for replacing a traditional elastic piece as an elastic force characteristic, and the problems that the elastic piece is small in force and prone to fatigue are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of liquid expansion type automatic controller, and specifically relates to a liquid expansion type automatic controller. BACKGROUND

[0002] The existing liquid expansion type temperature controller is a device for controlling temperature by expansion and contraction of liquid, which adopts the principle of expansion and contraction of liquid under temperature change, controls the change of liquid volume in the material to realize the control of temperature, and is commonly used in small household appliances and air conditioning systems.

[0003] The liquid expansion type temperature controller utilizes the lever principle, utilizes the moving leaf to drive the on-off action of the switch, has the characteristics of accurate temperature control, long service life, stability and reliability, small temperature difference between start and stop, large temperature control adjustment range, large load current and convenient installation, etc. However, the current liquid expansion type temperature controller still has the problems of large size, certain limitation in production and installation, low service life of the moving leaf, small elastic force and the like, and therefore needs to be further improved and perfected. SUMMARY

[0004] The utility model aims at solving the above-mentioned problems of the prior art, and provides a liquid expansion type automatic controller which has a simple and reasonable structure, and mainly uses a spring structure as elastic force characteristics to replace the traditional leaf spring to solve the problem of small force and easy fatigue of the leaf spring.

[0005] A liquid expansion type automatic controller, comprising a body base with an assembly cavity, a diaphragm box is arranged in the assembly cavity, a capillary tube is connected to the diaphragm box, the capillary tube extends out of the body base and is connected with a temperature sensing cylinder, a control assembly is arranged in the assembly cavity and cooperates with the diaphragm box to trigger, the control assembly comprises a pair of fixedly arranged lead electrodes and a movably arranged conductive bridge, the two ends of the conductive bridge are in sliding contact with the two lead electrodes, a push rod is slidably connected in the assembly cavity and is adjacent to or abuts against the diaphragm box on the lower side, an energy storage spring is arranged between the push rod and the conductive bridge, when the push rod moves downward under the expansion of the diaphragm box, the energy storage spring is compressed, and when the relative positions of the two ends of the energy storage spring change, the conductive bridge is pushed upward by the elastic potential energy, so that the conductive bridge is separated from the lead electrodes and the control assembly is disconnected.

[0006] The utility model can also be solved by the following technical measures:

[0007] As a more specific scheme, an elastic buffer structure is further arranged in the body base, the elastic buffer structure is pressed between the bottom surface of the push rod and the cavity bottom of the assembly cavity along the sliding direction of the push rod, and the elastic buffer structure comprises a buffer spring.

[0008] As a further scheme, the push rod is provided with a hollow cavity for limiting sliding cooperation, and the conductive bridge is arranged in the hollow cavity and located on the push rod, and the energy storage springs are arranged on the left and right sides of the push rod and abut against the conductive bridge, and the conductive bridge is upwardly translated and released by the two energy storage springs.

[0009] As a further scheme, the conductive bridge is provided with an avoiding opening for avoiding the energy storage spring during position transformation, the avoiding opening is provided with a clamping lug on the side close to the end of the conductive bridge, one end of the energy storage spring is located on the clamping lug, and the left and right sides of the push rod are provided with protruding points, and the other end of the energy storage spring is located on the protruding points.

[0010] As a further scheme, the top of the body base is threadedly connected with a temperature adjusting rod, the temperature adjusting rod is provided with a threaded through hole, the diaphragm box is provided with a protruding rod for linear sliding cooperation with the threaded through hole, and the threaded through hole is threadedly connected with a fine adjusting rod, and the fine adjusting rod abuts against the upper side of the protruding rod.

[0011] As a further scheme, the bottom of the body base is provided with a one-shaped conductive bridge limiting groove, the conductive bridge and the push rod are limited to slide in the conductive bridge limiting groove, the groove wall opposite to the conductive bridge limiting groove is provided with a guide rail structure, and the push rod is provided with a guide rail cooperation part for linear sliding cooperation with the guide rail structure.

[0012] As a further scheme, the cavity bottom of the assembly cavity is provided with a spring positioning groove and a guide groove, and a step surface is arranged between the spring positioning groove and the guide groove, the bottom of the push rod downwardly extends a guide column for sliding cooperation with the guide groove, the buffer spring is sleeved outside the guide column and is limited in the spring positioning groove, and the two ends of the buffer spring abut against the bottom surface of the push rod and the step surface respectively.

[0013] As a further scheme, the body base is a box-shaped structure made of high-temperature-resistant material, the box-shaped structure comprises a box body and a box cover, and an assembly cavity is defined between the box body and the box cover; the conductive bridge limiting groove transversely penetrates through a pair of side walls of the box body and forms two openings, the lead-out electrode is arranged to extend out of the body base through the openings, and the box cover extends a vertical plate matched with the shape of the opening, and the lead-out electrode is pressed and fixed at the bottom of the opening by the vertical plate.

[0014] As a further scheme, the top surface of the box cover is provided with a mounting bracket, a plurality of upper through holes are arranged in the mounting bracket, and a lower through hole and a threaded deep hole are arranged in the box cover and the box body respectively and correspondingly to the upper through holes, a bolt is sequentially arranged through the upper through hole, the lower through hole and the threaded deep hole, so that the box cover is fastened to the upper side of the box body, and the mounting bracket is fastened to the top surface of the box cover.

[0015] As a further solution, each lead-out electrode comprises a connection terminal, one end of which extends out of the body base, and the other end of which is inside the body base and is connected with a static contact, and the two ends of the conductive bridge are respectively provided with a dynamic contact, and the two dynamic contacts are synchronously contacted with or separated from the two static contacts.

[0016] The utility model has the advantages that:

[0017] I. This liquid expansion type automatic controller can reduce the volume, is simpler to process, can reduce the cost, has the advantages of multiple functions and strong performance.

[0018] II. The structure uses a spring structure as the elastic property, has large elasticity, high service life, and high temperature control precision, replaces traditional spring sheets, and solves the problems of small spring sheet force and easy fatigue.

[0019] III. The body base is made of high-temperature-resistant materials such as engineering plastics, is fireproof and flame-retardant, has a small deformation coefficient, replaces traditional ceramic materials, is easy to maintain dimensional consistency during the production process, and is not easy to break and deform.

[0020] IV. The new structure adopts double-contact connection and double-contact separation, and realizes the double power-off protection function.

[0021] V. The mounting bracket is combined with the body base by screw locking, is easy and reliable to install, and prevents the temperature controller from being loosened due to excessive plugging force during use. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a cross-sectional structure schematic view of an embodiment in the utility model.

[0023] Figure 2 It is a cross-sectional structure schematic view of an automatic controller in the utility model (control assembly connected state).

[0024] Figure 3 It is a cross-sectional structure schematic view of an automatic controller in the utility model (control assembly disconnected state).

[0025] Figure 4 It is a schematic view of a push rod and a conductive bridge cooperation structure in the utility model.

[0026] Figure 5 It is a schematic view of a push rod and a conductive bridge separated structure in the utility model.

[0027] Figure 6 It is a schematic view of an assembly cavity structure in the utility model.

[0028] Figure 7 It is a schematic view of an automatic controller exploded structure in the utility model. DETAILED DESCRIPTION

[0029] The utility model is further illustrated below in combination with the drawings and examples.

[0030] Reference Figures 1 to 7 As shown in the figure, a liquid expansion type automatic controller, comprising a body base 1 with an assembly cavity 101, the assembly cavity 101 is provided with a diaphragm box 2, the diaphragm box 2 is connected with a capillary tube 3, and the capillary tube 3 extends out of the body base 1 and is connected with a temperature sensing cylinder 4, the assembly cavity 101 is provided with a control assembly which is triggered with the diaphragm box 2, the control assembly comprises a pair of fixedly arranged lead-out electrodes 5 and a movably arranged conductive bridge 6, the two ends of the conductive bridge 6 are in sliding contact with the two lead-out electrodes 5 respectively, the assembly cavity 101 is also slidably connected with a push rod 7 which is adjacent to or abuts against the lower side of the diaphragm box 2, the push rod 7 is in abutment with an energy storage spring 8 between the push rod 7 and the conductive bridge 6, when the push rod 7 is compressed, the energy storage spring 8 is compressed, and when the relative positions of the two ends of the energy storage spring 8 are changed, the conductive bridge 6 is pushed upward by the elastic potential energy, so that the conductive bridge 6 is separated from the lead-out electrodes 5 and the control assembly is disconnected.

[0031] This liquid expansion type automatic controller can reduce the volume, is easier to process, can reduce the cost, has the advantages of multiple functions and strong performance, and the specific working principle is as follows:

[0032] When the temperature sensing cylinder 4 extends out of the base and monitors the temperature change of the controlled object, the diaphragm box 2 expands with the temperature change, so that the push rod 7 moves downward, and the energy storage spring 8 in the automatic controller is compressed, when the contact end of the energy storage spring 8 is level with or lower than the contact end of the conductive bridge 6, the energy storage spring 8 releases the energy, so that the conductive bridge 6 is pushed upward, the conductive bridge 6 is separated from the lead-out electrodes 5, and the control assembly is disconnected (as shown in the figure), when the diaphragm box 2 shrinks, the push rod 7 returns to the original position, the energy storage spring 8 and the conductive bridge 6 act in the opposite direction, and finally the conductive bridge 6 is in contact with the lead-out electrodes 5 again, so that the control assembly is reconnected (as shown in the figure). Figure 3 Figure 2

[0033] The body base 1 is also provided with an elastic buffer structure, which is pressed between the bottom surface of the push rod 7 and the cavity bottom of the assembly cavity 101 along the sliding direction of the push rod 7, when the push rod 7 moves downward, the elastic buffer structure is used for buffering the push rod 7, so that the push rod 7 does not slide too fast or too deep, and will not collide with the body base 1, and it is also helpful for the reset of the push rod 7 when the diaphragm box 2 shrinks.

[0034] In this embodiment, the elastic buffer structure is a buffer spring 9.

[0035] ​​The push rod 7 is provided with a hollow cavity 701 which limits the sliding of the push rod 7, the conductive bridge 6 is arranged in the hollow cavity 701 and is located on the push rod 7, the left and right sides of the push rod 7 are provided with energy storage springs 8 which are arranged in an inclined manner and abut against the conductive bridge 6, and the conductive bridge 6 is upwardly translated and is popped up by the two energy storage springs 8; the conductive bridge 6 is slidably arranged in the hollow cavity 701, the conductive bridge 6 is limited in sliding and is guided, the combination of the push rod 7 and the conductive bridge 6 makes the structure more compact and reduces the occupied space, thereby reducing the volume of the body base 1.

[0036] The conductive bridge 6 is provided with an avoiding opening 601 which is used for avoiding the energy storage spring 8 during the position change, the avoiding opening 601 is provided with a clamping lug 602 which is located on one side of the end of the conductive bridge 6, one end of the energy storage spring 8 is located on the clamping lug 602, and the left and right sides of the push rod 7 are provided with protrusions 71, and the other end of the energy storage spring 8 is located on the protrusions 71.

[0037] Since the energy storage spring 8 is compressed, the relative position of the two ends of the energy storage spring 8 is changed, the avoiding opening 601 makes the conductive bridge 6 cross the energy storage spring 8 and be popped up upwardly, the effect of the relative position change is ensured, and the clamping lug 602 and the protrusions 71 can locate the end of the energy storage spring 8, and the energy storage spring 8 will not be compressed and be shifted.

[0038] In addition, in the embodiment, the upper side of the hollow cavity 701 is extended with a limiting vertical plate 72, the two protrusions 71 are integrally arranged on the left and right sides of the limiting vertical plate 72, in addition, the top surface of the push rod 7 is extended with a contact protrusion 73 which is in an arc shape, the contact protrusion 73 helps the diaphragm capsule 2 to push the push rod 7 when the diaphragm capsule 2 is expanded, a slot 702 is formed between the limiting vertical plate 72 and the push rod 7, after the conductive bridge 6 is popped up upwardly, the narrow side of the conductive bridge 6 is slid into the slot 702, and the conductive bridge 6 can be prevented from shaking left and right along the symmetry line.

[0039] The conductive bridge 6 is integrally stamped from a metal material, and has a conductive capacity, and the two sides of the conductive bridge 6 are provided with upwardly raised flanges 603 which can improve the strength of the conductive bridge 6 and prevent the conductive bridge 6 from being deformed when the energy storage spring 8 pushes.

[0040] The top of the body base 1 is threadedly connected with a temperature adjusting rod 10, the temperature adjusting rod 10 is provided with a threaded through hole 1001, the diaphragm capsule 2 is provided with a protruding rod 21 which is linearly slidably arranged in the threaded through hole 1001, and a fine adjusting rod 11 is threadedly connected in the threaded through hole 1001 and abuts against the upper side of the protruding rod 21; the distance between the diaphragm capsule 2 and the push rod 7 can be controlled by rotating the temperature adjusting rod 10 to control the temperature, and the fine adjusting rod 11 can be rotated to change the initial distance between the temperature adjusting rod 10 and the diaphragm capsule 2 when the product is adjusted.

[0041] The bottom of the body base 1 is provided with a one-word type conductive bridge limiting slot 102, the conductive bridge 6 and the push rod 7 are limited to slide in the conductive bridge limiting slot 102, the slot wall opposite to the conductive bridge limiting slot 102 is provided with a guide rail structure, the push rod 7 is provided with a guide rail matching part which forms a linear sliding fit with the guide rail structure; the conductive bridge limiting slot 102 can limit the conductive bridge 6 from swinging left and right or rotating when subjected to force.

[0042] In the embodiment, the guide rail structure is a push rod limiting slot 103 which matches the shape of the push rod 7, the main part of the push rod 7 is in a square column structure, and the main part thereof constitutes the guide rail matching part, by matching the main part of the push rod 7 with the push rod limiting slot 103, it is ensured that the push rod 7 slides along the axial direction, and at the same time, it is also avoided that the push rod 7 swings left and right or rotates when subjected to force.

[0043] The cavity bottom of the assembly cavity 101 is provided with a spring positioning slot 104 and a guide slot 105, and a step surface 106 is arranged between the spring positioning slot 104 and the guide slot 105, the bottom of the push rod 7 extends downwardly to have a guide column 74 which is in sliding fit with the guide slot 105, the buffer spring 9 is sleeved outside the guide column 74 and is limited in the spring positioning slot 104, and the two ends thereof are respectively abutted against the bottom surface of the push rod 7 and the step surface 106; the guide column 74 and the guide slot 105 are matched to prevent the bottom end of the push rod 7 from swinging left and right, and the buffer spring 9 can be supported.

[0044] The body base 1 is a box-shaped structure made of high-temperature-resistant material, the box-shaped structure includes a box body 12 and a box cover 13, and the box body 12 and the box cover 13 jointly define the assembly cavity 101; the conductive bridge limiting slot 102 transversely penetrates through a pair of side box walls of the box body 12 and forms two openings 107, the lead-out electrode 5 extends out of the body base 1 through the opening 107, the box cover 13 extends a vertical plate 131 which matches the shape of the opening 107, and the lead-out electrode 5 is pressed and fixed at the bottom of the opening 107 by the vertical plate 131; the body base 1 is made of high-temperature-resistant material such as engineering plastic, is fireproof and flame-retardant, has a small deformation coefficient, replaces traditional ceramic material, is easy to keep dimensional consistency in the production process, is not easy to break and deform, and can fix the lead-out electrode 5 through the connection of the box cover 13, and is easy to install.

[0045] In addition, a notch 108 is formed in the side edge of one of the vertical plates 131, the notch 108 and the opening 107 form a through hole 109, the capillary tube 3 extends out of the body base 1 through the through hole 109, when the diaphragm capsule 2 is installed into the inner cavity of the box body 12, the capillary tube 3 can be led out by using the open notch 108, so that the diaphragm capsule 2, the capillary tube 3 and the temperature sensing cylinder 4 can be connected and assembled, and then the assembly is installed into the box body 12, and the capillary tube 3 can be fixed in position by using the installed box cover 13.

[0046] The top surface of the box cover 13 is provided with a mounting bracket 14, and a plurality of upper through holes 141 are formed in the mounting bracket 14. The box cover 13 and the box body 12 correspond to the upper through holes 141 and are respectively provided with lower through holes 132 and threaded deep holes 121. The box cover 13 is fastened to the upper side of the box body 12 through bolts 16 passing through the upper through holes 141, the lower through holes 132 and the threaded deep holes 121 in sequence. The mounting bracket 14 is fastened to the top surface of the box cover 13. The mounting bracket 14 is screw-locked to the body base 1, which is simple and reliable in installation and prevents the temperature controller from being loosened due to excessive plugging force.

[0047] The mounting bracket 14 has a cross-shaped structure. The top surface of the box cover 13 is provided with a cross-shaped groove 133, and the cross-shaped structure is arranged in the cross-shaped groove 133. The upper through holes 141 are formed in one pair of side end portions of the cross-shaped structure. Another pair of side end portions of the cross-shaped structure are formed into upturned connecting lugs 142 through continuous bending. The connecting lugs 142 are provided with assembly through holes 143 for mounting an automatic controller.

[0048] A cover hole is formed in the center of the cross-shaped groove 133. The mounting bracket 14 is provided with an internally threaded sleeve 144 extending into the cover hole. The temperature adjusting rod 10 is provided with an externally threaded portion 1002, which is connected to the internally threaded sleeve 144 of the mounting bracket 14.

[0049] The temperature adjusting rod 10 is connected to a limiting swing block 1003 rotating with the temperature adjusting rod 10. The mounting bracket 14 is provided with a limiting baffle 145 upturned and folded through stamping. The limiting baffle 145 can limit the angle of rotation of the temperature adjusting rod 10 to prevent the temperature adjusting rod 10 from being excessively rotated out or in.

[0050] Each lead-out electrode 5 includes a connecting terminal 51, one end of which extends out of the body base 1. In this embodiment, the one end of the connecting terminal 51 is bent downward, which is helpful for subsequent wiring. The other end of the connecting terminal 51 is arranged in the body base 1 and connected to a static contact 52. The conductive bridge 6 is provided with a dynamic contact 61 at each end. The two dynamic contacts 61 are synchronously contacted or separated from the two static contacts 52. This structure realizes double power-off protection function through double contact and double separation.

[0051] During installation, the other end of the connecting terminal 51 is provided with a first connecting hole 511. The bottom of the body base 1 is provided with a second connecting hole 110 corresponding to the first connecting hole 511. The connecting terminal 51 is riveted in the body base 1 through a rivet 15 passing through the first connecting hole 511 and the second connecting hole 110.

[0052] The above is the preferred scheme of the utility model, and the basic principle, main features and advantages of the utility model are displayed and described. Those skilled in the art should understand that the utility model is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and the description in the specification are only for the purpose of illustrating the principle of the utility model. The utility model can have various changes and improvements without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed, and the scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A liquid expansion automatic controller, comprising a body base with an internal assembly cavity, wherein a diaphragm is disposed within the assembly cavity, a capillary tube is connected to the diaphragm, the capillary tube extends out of the body base and is connected to a temperature sensing cylinder, and a control component is disposed within the assembly cavity to trigger and cooperate with the diaphragm, characterized in that: The control assembly comprises a pair of fixedly arranged lead-out electrodes and a movably arranged conductive bridge, two ends of the conductive bridge are in sliding contact with the two lead-out electrodes respectively, a push rod is slidably connected in the assembly cavity and is adjacent to or abuts against the lower side of the diaphragm box, an energy storage spring is in abutment between the push rod and the conductive bridge, when the push rod is pushed downward and moves downward due to the expansion of the diaphragm box, the energy storage spring is compressed, and when the relative positions of the two ends of the energy storage spring are changed, the conductive bridge is pushed upward by the elastic potential energy to realize the separation of the conductive bridge from the lead-out electrodes and the disconnection of the control assembly.

2. A liquid expansion type automatic controller according to claim 1, wherein: The body base is further provided with an elastic buffer structure, which is in abutment between the bottom surface of the push rod and the bottom of the assembly cavity along the sliding direction of the push rod; the elastic buffer structure comprises a buffer spring.

3. A liquid expansion type automatic controller according to claim 1, wherein: The push rod is provided with a hollow cavity for limiting sliding cooperation, the conductive bridge is arranged in the hollow cavity and is located on the push rod, and the left and right sides of the push rod and the conductive bridge are in abutment with the energy storage springs arranged obliquely, and the conductive bridge is translated upward by the two energy storage springs.

4. A liquid expansion type automatic controller according to claim 3, wherein: The conductive bridge is provided with an avoiding opening for avoiding the energy storage spring in position change, the side of the avoiding opening close to the end of the conductive bridge is provided with a clamping ear, one end of the energy storage spring is located on the clamping ear, the left and right sides of the push rod are provided with protruding points, and the other end of the energy storage spring is located on the protruding points.

5. A liquid expansion type automatic controller according to claim 1, wherein: The top of the body base is threadedly connected with a temperature adjusting rod, the temperature adjusting rod is provided with a threaded through hole, the diaphragm box is provided with a protruding rod for linear sliding cooperation with the threaded through hole, a fine adjusting rod is threadedly connected in the threaded through hole, and the fine adjusting rod is in abutment with the upper side of the protruding rod.

6. A liquid expansion type automatic controller according to claim 3, wherein: The bottom of the body base is provided with a one-dimensional conductive bridge limiting groove, the conductive bridge and the push rod are limited to slide in the conductive bridge limiting groove, the groove wall opposite to the conductive bridge limiting groove is provided with a guide rail structure, and the push rod is provided with a guide rail cooperation part for linear sliding cooperation with the guide rail structure.

7. A liquid expansion type automatic controller according to claim 2, wherein: The bottom of the body base is provided with a one-dimensional conductive bridge limiting groove, the conductive bridge and the push rod are limited to slide in the conductive bridge limiting groove, the groove wall opposite to the conductive bridge limiting groove is provided with a guide rail structure, and the push rod is provided with a guide rail cooperation part for linear sliding cooperation with the guide rail structure.

8. A liquid expansion type automatic controller according to claim 6, wherein: The bottom of the body base is provided with a one-dimensional conductive bridge limiting groove, the conductive bridge and the push rod are limited to slide in the conductive bridge limiting groove, the groove wall opposite to the conductive bridge limiting groove is provided with a guide rail structure, and the push rod is provided with a guide rail cooperation part for linear sliding cooperation with the guide rail structure.

9. A liquid expansion automatic controller according to claim 8, wherein: The body base is a box-shaped structure made of high-temperature-resistant material, the box-shaped structure comprises a box body and a box cover, and the box body and the box cover are combined to define the assembly cavity; the conductive bridge limiting groove transversely penetrates through a pair of side walls of the box body and forms two openings, the lead-out electrodes are arranged to extend out of the body base through the openings, and the box cover extends a vertical plate matched with the shape of the opening, and the lead-out electrodes are clamped at the bottom of the opening by the vertical plate. The top surface of the box cover is provided with a mounting bracket, a plurality of upper through holes are formed in the mounting bracket, and the box cover and the box body are respectively provided with lower through holes and threaded deep holes corresponding to the upper through holes, a bolt is sequentially arranged through the upper through hole, the lower through hole and the threaded deep hole, so that the box cover is fastened to the upper side of the box body, and the mounting bracket is fastened to the top surface of the box cover.

10. A liquid expansion type automatic controller according to claim 1 or 3, wherein: Each of the lead-out electrodes comprises a connecting terminal, one end of which extends out of the body base, and the other end of which is in the body base and connected with a static contact, and the two ends of the conductive bridge are respectively provided with a dynamic contact, and the two dynamic contacts are synchronously contacted with or separated from the two static contacts.

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