Energy storage type liquid expansion temperature controller

Abstract

The utility model relates to a kind of energy storage type liquid expansion type temperature controller, including support fixed frame, the diaphragm box is provided in support fixed frame, the diaphragm box is connected with temperature sensing cylinder by capillary, and the downside of support fixed frame is assembled and is connected with the protruding jump module of diaphragm box coaxial arrangement, electric circuit is equipped on the protruding jump module, there is touch switch in series on electric circuit, the end surface of diaphragm box towards touch switch is equipped with center push part, the center push part is energy storage spring, energy storage spring indirectly or directly acts on touch switch;This liquid expansion type temperature controller adopts energy storage spring to open touch switch, energy storage spring has certain energy storage effect, when reaching trigger power, energy storage spring releases elastic potential energy instantaneously, so that touch switch is disconnected, and disconnecting action is more rapid, can avoid electric shock between moving contact piece and static contact piece in touch switch, can greatly improve the service life of touch switch.

Description

Technical Field

[0001] This utility model relates to the field of liquid expansion thermostats, specifically an energy storage type liquid expansion thermostat. Background Technology

[0002] The current structure of a liquid expansion thermostat is shown in Chinese patent document, application number: 202210734970.9. This patent discloses a base, a cover and a bracket on the upper side of the base, and a spring-loaded terminal and a fixed terminal connected to the base. A stationary contact is fixed on the fixed terminal, and a spring-loaded terminal has a spring with a moving contact that contacts the stationary contact and forms an electrical path. A liquid expansion diaphragm box is provided on the cover, and a feature at the lower end of the liquid expansion diaphragm box for compressing the spring to... The moving contact of the ceramic element is designed to push the ceramic element against the spring when the diaphragm expands, thus separating the moving and stationary contacts and disconnecting the conductive circuit. However, the rate of expansion of the diaphragm is slow, causing the ceramic element to slowly push open the spring. This can lead to electric shock between the moving and stationary contacts during separation, severely affecting the service life of the spring terminals and the fixed terminals, and even limiting the circuit to only a few switching operations. Therefore, the applicant has improved and perfected the liquid expansion thermostat to solve the above problems and provide it for consumers to choose from. Utility Model Content

[0003] The purpose of this invention is to solve the aforementioned problems and provide a simple and reasonable energy storage liquid expansion thermostat.

[0004] An energy storage type liquid expansion thermostat includes a support frame, a diaphragm box is disposed inside the support frame, the diaphragm box is connected to a temperature sensing cylinder through a capillary tube, and a snap-action module coaxially arranged with the diaphragm box is assembled and connected to the lower side of the support frame. The snap-action module is provided with a conductive line, and a touch switch is connected in series on the conductive line. The end face of the diaphragm box facing the touch switch is provided with a central pushing part, which is an energy storage spring. The energy storage spring acts indirectly or directly on the touch switch.

[0005] The objective of this utility model can also be achieved by the following technical measures: As a more specific embodiment, the energy storage spring is a tower-shaped spring that is narrow at the top and wide at the bottom.

[0006] As a further embodiment, the jump module includes a bulging steel plate with a circular curved surface placed on top. A movable push rod is abutted between the bulging steel plate and the touch switch. The movable push rod is coaxially arranged with an energy storage spring, and the energy storage spring is abutted or adjacent to the center of the surface of the bulging steel plate.

[0007] As a further solution, the snap-action module includes a circular outer shell, a guiding cover disposed on the top of the circular outer shell, and a metal sealing cover for encapsulating the guiding cover. The touch switch is arranged inside the circular outer shell. A guiding hole for slidingly mating with the movable push rod is formed on the guiding cover. The vibrating steel sheet is defined to be between the metal sealing cover and the guiding cover, and an avoidance opening is formed at the center position of the metal sealing cover corresponding to the vibrating steel sheet.

[0008] As a further solution, the support fixing frame has a "冂"-shaped structure, and lower mounting ears formed by folding outwards are provided at both bottom ends of the support fixing frame. Lower connecting holes are formed on the lower mounting ears. The metal sealing cover is integrally connected with connecting ears arranged on opposite sides. First connecting holes are formed on the connecting ears corresponding to the lower connecting holes. The snap-action module is connected to the support fixing frame by sequentially passing a fastening unit through the first connecting holes and the lower connecting holes.

[0009] As a further solution, the diaphragm box includes a disc-shaped diaphragm box body with a diameter of R≤18 mm. A liquid storage cavity is arranged inside the diaphragm box body. A diaphragm box flange bent towards the touch switch direction is provided at the edge of the diaphragm box body. A through hole communicating with the liquid storage cavity is formed at the center position on the top surface of the diaphragm box body. A diaphragm box handle covering the through hole is provided on the upper side of the diaphragm box body. An installation channel arranged laterally is formed inside the diaphragm box handle for the capillary to be inserted and communicate with the through hole.

[0010] As a further solution, upper mounting ears bent outwards are provided on the opposite sides at the top of the support fixing frame. Upper connecting holes for installing a liquid expansion type temperature controller are formed on the upper mounting ears, and the lower mounting ears and the upper mounting ears are arranged opposite to each other in the vertical direction.

[0011] As a further solution, both the touch switch and the movable push rod are within the orthographic projection range below the diaphragm box; or the circular outer shell is also within the orthographic projection range below the diaphragm box.

[0012] As a further solution, open openings are provided on the front and rear sides of the support fixing frame. Encapsulation enclosing plates are covered at the open openings. An enclosed cavity is defined by surrounding between the two encapsulation enclosing plates and the support fixing frame. The diaphragm box and the energy storage spring are arranged inside the enclosed cavity, and the two encapsulation enclosing plates are connected to the snap-action module or the support fixing frame.

[0013] As a further solution, the touch switch includes a movable contact piece and a static contact piece in elastic contact; The movable contact piece includes a movable contact fixing piece and a movable contact movable piece integrally bent above the movable contact fixing piece. A movable contact point is provided at the end of the movable contact movable piece, and a convex contact point is provided at the position of the movable contact movable piece corresponding to the movable push rod; The stationary contact piece is disposed on the upper side of the movable contact piece, and one end of the stationary contact piece is provided with a stationary contact point that contacts the movable contact point. The stationary contact piece is provided with a clearance cavity corresponding to the movable push rod.

[0014] The beneficial effects of this utility model are as follows: This utility model discloses an energy storage type liquid expansion thermostat. This liquid expansion thermostat uses an energy storage spring to open the touch switch. The energy storage spring has a certain energy storage function. When the triggering force is reached, the energy storage spring releases elastic potential energy instantly, causing the touch switch to open. Moreover, the opening action is faster, which can avoid electric shock between the moving contact and the stationary contact in the touch switch and can significantly improve the service life of the touch switch. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the liquid expansion type temperature controller in this utility model.

[0016] Figure 2 This is a schematic diagram of the orthographic projection of the membrane box and the jump module in this utility model.

[0017] Figure 3 This is an exploded structural diagram of the liquid expansion type temperature controller in this utility model.

[0018] Figure 4 This is a schematic diagram of the cross-sectional structure of the membrane box in this utility model.

[0019] Figure 5 This is a top view of the support and fixing frame structure in this utility model.

[0020] Figure 6 This is a schematic diagram of one embodiment of the encapsulation enclosure in this utility model.

[0021] Figure 7 This is a schematic diagram of another embodiment of the encapsulation plate in this utility model.

[0022] Figure 8 This is a schematic diagram of the structure of the conductive circuit in this utility model. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] See Figures 1 to 6As shown, an energy storage type liquid expansion thermostat includes a support frame 1, a diaphragm box 2 is disposed inside the support frame 1, a temperature sensing cylinder 4 is connected to the diaphragm box 2 through a capillary tube 3, and a snap-action module 5 coaxially disposed with the diaphragm box 2 is assembled and connected to the lower side of the support frame 1. The snap-action module 5 is provided with a conductive line, and a touch switch 6 is connected in series on the conductive line. The end face of the diaphragm box 2 facing the touch switch 6 is provided with a central pushing part, which is an energy storage spring 7. The energy storage spring 7 acts indirectly or directly on the touch switch 6.

[0025] This liquid expansion thermostat uses an energy storage spring 7 to open the touch switch 6. The energy storage spring 7 has a certain energy storage function. When the triggering force is reached, the energy storage spring 7 releases its elastic potential energy instantly, causing the touch switch 6 to open. The opening action is faster, which can avoid electric shock between the moving contact and the stationary contact in the touch switch 6 and can greatly improve the service life of the touch switch 6.

[0026] The energy storage spring 7 is a tower-shaped spring that is narrow at the top and wide at the bottom. The tower-shaped spring can withstand greater pressure and store more energy in the same installation space. It is suitable for the small space structure of liquid expansion thermostat. The energy storage spring 7 with this structure can maintain stable axial movement when compressed or expanded, preventing the energy storage spring 7 from slipping at the bottom when facing the bulging steel sheet 51 described below during compression, which would cause the energy storage spring 7 to deform and fail to operate.

[0027] The jump module 5 includes a bulging steel plate 51 with a circular curved surface placed on top. A movable push rod 52 abuts against the touch switch 6. The movable push rod 52 is coaxially arranged with the energy storage spring 7, and the energy storage spring 7 is abutting against or adjacent to the center of the surface of the bulging steel plate 51. Based on the above structure, the working principle of the energy storage type liquid expansion thermostat is as follows: The temperature sensing cylinder 4 senses the high temperature, causing the internal liquid to expand. It is then squeezed into the diaphragm box 2 through the capillary tube 3, causing the diaphragm box 2 to expand and push the energy storage spring 7 at the bottom to move downward. Initially, the energy storage spring 7 will press against the center position of the surface of the bulging steel sheet 51. When both ends are restricted, the energy storage spring 7 will begin to store elastic potential energy. When the stored elastic potential energy reaches the triggering power, the bulging steel sheet 51 will be pushed and deformed downward instantly, thereby quickly pushing the movable push rod 52 to press against the touch switch 6, causing the touch switch 6 to disconnect instantly.

[0028] The snap-action module 5 includes a circular housing 53, a guiding cover 54 placed on the top of the circular housing 53, and a metal cover 55 for encapsulating the guiding cover 54. The touch switch 6 is arranged inside the circular housing 53. A guiding hole 541 which is in sliding fit with the movable push rod 52 is formed on the guiding cover 54. The vibrating steel sheet 51 is defined to be between the metal cover 55 and the guiding cover 54, and an avoidance opening 551 corresponding to the center position of the vibrating steel sheet 51 is formed on the metal cover 55. The snap-action module 5 with this structure is similar to the snap-action thermostat in the prior art. The difference is that the vibrating steel sheet 51 only plays the role of being pressed to act and will not be deformed due to the increase in temperature.

[0029] The support fixing frame 1 has a "冂"-shaped structure, and lower mounting ears 83 which are formed by turning outwards are arranged at the two bottom ends of the support fixing frame 1. A lower connection hole 831 is formed on the lower mounting ear 83. The metal cover 55 is integrally connected with connection ears 56 arranged on the opposite side. A first connection hole 561 corresponding to the lower connection hole 831 is formed on the connection ear 56. The snap-action module 5 is connected to the support fixing frame 1 by fastening units such as screws 9 passing through the first connection hole 561 and the lower connection hole 831 in sequence.

[0030] The support fixing frame 1 includes a support top plate 81 and support side plates 82 connected to the left and right sides of the support top plate 81. The support side plates 82 have the same width as the support top plate 81. The connection ear 56 is integrally connected to the bottom of the support side plate 82.

[0031] See Figure 4 As shown, the bellows 2 includes a bellows main body 21 in a disc shape. The diameter of the bellows main body 21 is R, and in this embodiment, preferably 12 mm ≤ R ≤ 17 mm. A liquid storage cavity 201 is arranged inside the bellows main body 21. A bellows flange 22 which is bent towards the touch switch 6 is arranged at the edge of the bellows main body 21. A through hole 202 which is communicated with the liquid storage cavity 201 is formed at the center position of the top surface of the bellows main body 21. A bellows handle 23 which covers the outside of the through hole 202 is arranged on the upper side of the bellows main body 21. An installation channel 231 which is arranged laterally is formed in the bellows handle 23. The installation channel 231 is used for the capillary 3 to be inserted and communicated with the through hole 202. A center pushing part 24 is connected to the center position of the bottom surface of the bellows main body 21. This bellows 2 can reduce the main body diameter, so that the liquid expansion type thermostat applying the bellows 2 can reduce the volume, making the liquid expansion type thermostat more compact and small. Moreover, the bellows flange 22 and the bellows handle 23 are arranged on the opposite sides of the bellows main body 21. When welding the capillary 3 to the bellows handle 23, it can prevent the welding torch cutting in laterally from contacting the bellows flange 22 and causing the bellows flange 22 to burn through and resulting in the leakage of the bellows 2.

[0032] The top of the support frame 1 is provided with an outwardly bent upper mounting ear 84. The upper mounting ear 84 is provided with an upper connecting hole 841 for installing a liquid expansion thermostat. The lower mounting ear 83 and the upper mounting ear 84 are arranged opposite each other in the vertical direction. This support bracket 1 arranges the lower mounting ears 83 and the upper mounting ears 84 on the left and right sides, which can make full use of the lateral space of the bracket structure and reduce the longitudinal area of ​​the support bracket 1. This allows the liquid expansion thermostat to maintain a compact structure, facilitates the installation of the liquid expansion thermostat, and reduces the requirements for installation space.

[0033] In this embodiment, a plate is stamped out on the support side plate 82 to connect with the side of the support top plate 81. The plate is bent twice to form an upper mounting ear 84. The upper mounting ear 84 is stamped out by the support side plate 82 itself. This structure eliminates the need to fix or weld the upper mounting ear 84 to the support fixing frame 1, which can improve production efficiency. Moreover, the position where the upper mounting ear 84 is stamped out of the support side plate 82 forms a window, which helps the heat dissipation of the diaphragm box 2 structure and avoids the temperature around the liquid expansion thermostat from affecting the expansion of the diaphragm box 2.

[0034] In this embodiment, the lower connecting hole 831 and the upper connecting hole 841 are arranged opposite each other on the same side, with the upper connecting hole 841 positioned to the outer side relative to the lower connecting hole 831; the lower connecting hole 831 and the upper connecting hole 841 are not coaxially arranged, and the lower connecting hole 831 and the upper connecting hole 841 are arranged on the same vertical plane X, so that the connection points of the liquid expansion thermostat are set in symmetrical positions, making the installation more stable; The touch switch 6 and the movable push rod 52 are both located within the orthographic projection range Y below the diaphragm box 2; or the circular outer shell 53 is located within the orthographic projection range Y below the diaphragm box 2. This liquid expansion thermostat places the entire touch switch 6 within the projected area of ​​the diaphragm box 2, which reduces the size of the housing containing the touch switch 6 and decreases the radial width of the liquid expansion thermostat. This keeps the entire thermostat compact, saves packaging space, and reduces transportation costs.

[0035] The support frame 1 has openings 101 on both the front and rear sides. The openings 101 are covered with encapsulation plates 10. The two encapsulation plates 10 and the support frame 1 together enclose and define a shielded cavity. The diaphragm box 2 and the energy storage spring 7 are arranged in the shielded cavity. The two encapsulation plates 10 are connected to the jump module 5 or the support frame 1. The mounting housing of this liquid expansion temperature controller consists of two parts: a support bracket 1 and an encapsulation plate 10. The encapsulation plates 10 on both sides of the support bracket 1 do not need to provide support, so they can be set independently. This allows the encapsulation plates 10 to be made of a thinner sheet metal material than the support bracket 1, thereby reducing the production cost of the mounting housing and the overall cost of the liquid expansion temperature controller.

[0036] In this embodiment, see Figure 7 As shown, the two encapsulation plates 10 are integrally connected to the front and rear sides of the metal cover 55. The sheet metal material used to manufacture the metal cover 55 is also thinner than that used for the support bracket 1. Therefore, integrally molding the encapsulation plates 10 and the metal cover 55 can improve production efficiency, further simplify the structure of the liquid expansion temperature controller, and reduce costs. After the switch housing is assembled and connected to the support bracket 1, the encapsulation plate 10 only needs to be bent upwards to complete the encapsulation work of the encapsulation plate 10.

[0037] In other embodiments, see Figure 7 As shown, it also includes a baffle frame 11, with two encapsulation baffles 10 integrally connected to opposite sides of the baffle frame 11. The baffle frame 11 is assembled between the support frame 1 and the connecting ear 56. The baffle frame 11 has a positioning opening 111 that cooperates with the snap-action module 5. In this embodiment, the encapsulation baffles 10 are independently installed between the support frame 1 and the connecting ear 56, so that the metal cover 55 and the connecting ear 56 can still adopt a conventional structure (both the metal cover 55 and the connecting ear 56 are common components in existing snap-action temperature controllers), without the need for additional molds, thus reducing production costs.

[0038] The two ends of the enclosure frame 11 are provided with second connecting holes 112 corresponding to the first connecting hole 561. The fastening unit passes through the first connecting hole 561, the second connecting hole 112 and the lower connecting hole 831 in sequence, so that the enclosure frame 11 is assembled and connected between the support fixing frame 1 and the connecting ear 56. Before the snap-up module 5 is assembled and connected to the lower side of the support frame 1, the enclosure frame 11 is first fitted onto the metal cover 55 using the positioning opening 111, which can restrict the sliding of the enclosure frame 11 in the horizontal direction. Then, the connecting ear 56 is aligned with the support frame 1, and finally the screw 9 is passed through each connecting hole to fix the snap-up module 5. The screw 9 preferably passes through the first connecting hole 561, the second connecting hole 112 and the lower connecting hole 831 from bottom to top. Since the space under the connecting lug 56 is open, it will not obstruct the movement of the screw 9. However, if the screw 9 passes through the lower connecting hole 831, the second connecting hole 112 and the first connecting hole 561 from top to bottom, the screw 9 is more likely to be obstructed by the side wall of the support bracket 1.

[0039] See Figure 8As shown, the touch switch 6 includes a movable contact 61 and a stationary contact 62 that have elastic contact; The movable contact piece 61 includes a movable contact fixed piece 611 and a movable contact movable piece 612 integrally bent above the movable contact fixed piece 611. The movable contact movable piece 612 has a movable contact point 613 at its end and a protruding contact point 614 at the position corresponding to the movable push rod 52. By arranging the fixed part and the elastic part of the movable contact piece 61 in the upper and lower layers respectively, the lateral length of the movable contact piece 61 can be reduced while achieving the elastic effect, thus making it more suitable for the compact circular shell 53. The stationary contact piece 62 is disposed on the upper side of the movable contact piece 612. One end of the stationary contact piece 62 is provided with a stationary contact point 621 that contacts the movable contact point 613. The stationary contact piece 62 is provided with a clearance cavity 622 corresponding to the movable push rod 52. The stationary contact piece 62 is fixed on the upper side of the movable contact piece 612 and is offset, so that there is enough space on the lower side of the stationary contact piece 62 for the movable contact piece 612 to move. The clearance cavity 622 allows the movable push rod 52 to pass through the stationary contact piece 62 and abut against the movable contact point 613 of the movable contact piece 612.

[0040] The outward-facing edges of the movable contact piece 612 and the stationary contact piece 62 are arc-shaped surfaces 63. The arc-shaped surfaces 63 of the movable contact piece 612 and the stationary contact piece 62 match or fit against the inner wall surface of the circular outer shell 53. Due to the constraints of the compact circular outer shell 53, making the edges of the movable contact piece 612 and the stationary contact piece 62 arc-shaped allows them to fit more tightly against the inner wall surface of the circular outer shell 53, thereby freeing up more installation and movement space.

[0041] The conductive circuit also includes a pair of connecting tabs 57. One end of the two connecting tabs 57 is placed inside the circular housing 53 and electrically connected to the moving contact fixing piece or the stationary contact piece through the rivet 58. The other end of the two connecting tabs 57 extends out of the circular housing 53 and extends downward in the vertical direction. The connecting tabs 57 are used to connect wires. The downwardly extending connecting tabs 57 do not occupy the lateral space of the jump module 5, so that the liquid expansion thermostat maintains a narrow body structure.

[0042] A connector is provided on the supporting top plate 81. The diaphragm box 2 is connected to the connector through the diaphragm box handle 23 and suspended in the supporting frame 1. In this embodiment, the connector can be a temperature adjustment rod 12. The supporting top plate 81 has an internal threaded hole. The temperature adjustment rod 12 is threaded into the internal threaded hole. By rotating the temperature adjustment rod 12, the position of the diaphragm box 2 is changed, thereby adjusting the temperature corresponding to the response of the touch switch 6.

[0043] The above describes the preferred embodiments of this utility model, illustrating and describing its basic principles, main features, and advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. An energy storage type liquid expansion thermostat, comprising a support frame, a diaphragm box disposed within the support frame, a temperature sensing cylinder connected to the diaphragm box via a capillary tube, and a snap-action module coaxially arranged with the diaphragm box mounted on the lower side of the support frame, the snap-action module having a conductive line, and a touch switch connected in series on the conductive line, characterized in that: The end face of the diaphragm box facing the touch switch is provided with a central pushing part, and the central pushing part is a storage spring, and the storage spring acts on the touch switch indirectly or directly.

2. The energy storage type liquid expansion thermostat according to claim 1, characterized in that: The storage spring is a tower-shaped spring with a narrow upper part and a wide lower part.

3. The energy storage type liquid expansion temperature controller according to claim 1, characterized in that: The snap-action module includes a vibrating steel sheet with a circular curved surface at the top. An active push rod is abutted between the vibrating steel sheet and the touch switch. The active push rod is coaxially arranged with the storage spring, and the storage spring is abutted or adjacent to the center of the surface of the vibrating steel sheet.

4. The energy storage type liquid expansion temperature controller according to claim 3, characterized in that: The snap-action module includes a circular outer shell, a guide cover arranged at the top of the circular outer shell, and a metal cover for encapsulating the guide cover. The touch switch is arranged in the circular outer shell. A guide hole for slidingly cooperating with the active push rod is opened on the guide cover. The vibrating steel sheet is defined between the metal cover and the guide cover, and the metal cover is provided with an avoidance opening corresponding to the center position of the vibrating steel sheet.

5. The energy storage type liquid expansion thermostat according to claim 4, characterized in that: The support fixing frame has a "冂"-shaped structure, and the two bottom ends of the support fixing frame are provided with lower mounting ears formed by turning outwards. Lower connecting holes are opened on the lower mounting ears. The metal cover is integrally connected with connecting ears arranged on the opposite side. The connecting ears are provided with first connecting holes corresponding to the lower connecting holes. The snap-action module is connected to the support fixing frame by sequentially passing through the first connecting holes and the lower connecting holes with a fastening unit.

6. The energy storage type liquid expansion temperature controller according to claim 1, characterized in that: The diaphragm box includes a disc-shaped diaphragm box body with a diameter of R≤18mm. A liquid storage cavity is arranged in the diaphragm box body. The edge of the diaphragm box body is provided with a diaphragm box flange bent towards the touch switch. A through hole communicating with the liquid storage cavity is opened at the center position of the top surface of the diaphragm box body. A diaphragm box handle is arranged on the upper side of the diaphragm box body and covers the through hole. A lateral installation channel is opened in the diaphragm box handle, and the installation channel is used for inserting a capillary tube and communicating with the through hole.

7. The energy storage type liquid expansion temperature controller according to claim 5, characterized in that: The top of the support fixing frame is provided with upper mounting ears bent outwards on the opposite side. Upper connecting holes for installing a liquid expansion type temperature controller are opened on the upper mounting ears, and the lower mounting ears and the upper mounting ears are arranged opposite to each other in the vertical direction.

8. The energy storage type liquid expansion temperature controller according to claim 4, characterized in that: The touch switch and the active push rod are both within the orthographic projection range below the diaphragm box; or the circular outer shell is also within the orthographic projection range below the diaphragm box.

9. The energy storage type liquid expansion temperature controller according to claim 1, characterized in that: Openings are provided on the front and rear sides of the support fixing frame, and the openings are covered with encapsulation enclosing plates. A surrounding cavity is defined by the two encapsulation enclosing plates and the support fixing frame. The diaphragm box and the storage spring are arranged in the surrounding cavity, and the two encapsulation enclosing plates are connected to the snap-action module or the support fixing frame.

10. The energy storage type liquid expansion temperature controller according to claim 1, characterized in that: The touch switch includes a moving contact piece and a static contact piece in elastic contact; The moving contact piece includes a moving contact fixing piece and a moving contact movable piece integrally bent above the moving contact fixing piece. A moving contact point is provided at the end of the moving contact movable piece, and a convex contact point is provided at the position of the moving contact movable piece corresponding to the active push rod; The static contact piece is arranged above the moving contact movable piece. A static contact point for contacting the moving contact point is provided at one end of the static contact piece, and an avoidance cavity is provided on the static contact piece corresponding to the active push rod.

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