Circuit protection switch

Abstract

The present application relates to the field of circuit switches, and specifically relates to a circuit protection switch. The circuit protection switch comprises a bracket, a blade holder, a blade, support plates, thermal expansion members and an energy storage spring, wherein the blade is vertically and fixedly connected below the blade holder, the blade holder is slidably connected to the bracket in a vertical direction, the upper end of the energy storage spring is fixedly connected to the bracket, and the lower end of the energy storage spring is fixedly connected to the blade holder, the energy storage spring being in a compressed state; the bracket is provided with a horizontal limiting surface, and the lower ends of the thermal expansion members press tightly against the limiting surface, the thermal expansion members being adapted to press tightly against an electric wire sheath; each support plate is located between the blade holder and one thermal expansion member, the support plate is C-shaped, a C-shaped opening of the support plate facing the blade, and the upper and lower ends of the support plate respectively pressing tightly against the blade holder and the thermal expansion member. When heated, the thermal expansion member expands to compress the support plate, causing the support plate to bend and deform, and eject from between the blade holder and the thermal expansion member; and the energy storage spring pushes the blade downwards to punch through an electric wire, thus disconnecting a circuit, and thereby protecting the circuit and preventing a sheath from burning out due to excessive temperature.

Description

A circuit protection switch Technical Field

[0001] The present application relates to the field of circuit switches, and in particular to a circuit protection switch. Background Art

[0002] Circuit protection switches are commonly used for circuit overload protection or leakage protection, and use electromagnets to drive the switch contacts to switch the switch state.

[0003] However, in the existing technology, some wires in an environment with poor air flow and high temperature cannot conduct the heat generated by the wires in time, which can easily cause the outer sheath of the wires to smoke or even burn due to excessive temperature. At this time, the current in the wires may be below the overload limit value, and the overload protector will not trip, so there is a safety hazard.

[0004] Summary of the Invention

[0005] In view of this, a circuit protection switch is proposed to cut off the circuit when the temperature of the wire sheath is too high, thereby preventing the wire sheath from burning.

[0006] The present application provides a circuit protection switch, comprising a bracket, a blade holder, a blade, a support sheet, a thermal expansion member, and a force storage spring;

[0007] The blade is vertically fixedly connected to the bottom of the blade holder, the cutting edge of the blade is vertically arranged downward, the blade holder and the bracket are slidably connected in the vertical direction, the force storage spring is connected in the vertical direction, the upper end of the force storage spring is fixedly connected to the bracket, and the lower end of the force storage spring is fixedly connected to the blade holder, and the force storage spring is in a compressed state;

[0008] The bracket is provided with a horizontal limit surface, the thermal expansion member, the blade and the knife holder are located above the limit surface, the lower end of the thermal expansion member is pressed and fitted with the limit surface, the thermal expansion member is suitable for pressing and fitting with the outer skin of the wire, and the thermal expansion member is located below the knife holder;

[0009] The support sheet is located between the tool holder and the thermal expansion member, and is C-shaped, with the C-shaped opening of the support sheet facing the blade. The upper end of the support sheet is tightly fitted with the tool holder in the vertical direction, and the lower end of the support sheet is tightly fitted with the thermal expansion member in the vertical direction.

[0010] When heated, the thermal expansion member expands and squeezes the support sheet, reducing the size of the C-shaped opening of the support sheet. After the C-shaped opening of the support sheet is reduced, the upper end of the support sheet can slide away from the bottom of the tool holder in a direction away from the blade, and / or the lower end of the support sheet can slide away from the top of the thermal expansion member in a direction away from the blade.

[0011] The left side of the blade and the right side of the blade are insulated from each other.

[0012] In some embodiments of the above-mentioned circuit protection switch, the bracket includes a top plate, a bottom plate, a front side plate, a rear side plate, and an adjusting bolt, the upper ends of the front side plate and the rear side plate are respectively fixedly connected to the top plate, the lower ends of the front side plate and the rear side plate are respectively spaced apart from each other, and the lower end surfaces of the front side plate and the rear side plate are respectively provided with vertical screw holes, and the bottom plate is provided with a through hole, and the adjusting bolt passes through the through hole and is threadedly connected to the screw hole, and after rotating the adjusting bolt, the top plate and the bottom plate can be driven to move in a direction away from or close to each other; the limiting surface is constituted by the upper surface of the bottom plate; the knife holder is located below the top plate, and the knife holder is slidably connected to the top plate in the vertical direction, the upper end of the force storage spring is fixedly connected to the top plate, and the knife holder, the force storage spring, the blade, the thermal expansion member, and the support sheet are located between the front side plate and the rear side plate.

[0013] In some embodiments of the above-mentioned circuit protection switch, the blade holder includes a clamping block, a pressure plate, and a guide rod fixedly connected in sequence from bottom to top, the upper edge of the blade is fixedly connected to the clamping block, the guide rod is vertically arranged, and the lower surface of the top plate is fixedly connected with a vertical guide cylinder, the guide rod and the guide cylinder are plugged in the vertical direction, the guide cylinder is located on the inner side of the force storage spring, the lower end of the force storage spring is fixedly connected to the upper surface of the pressure plate, the lower end surface of the guide cylinder is spaced apart from the upper surface of the pressure plate, and the upper end surface of the guide rod is spaced apart from the lower surface of the top plate.

[0014] In some embodiments of the circuit protection switch, the supporting piece and the thermal expansion member are provided in pairs and are symmetrically arranged on the left and right sides of the blade.

[0015] In some embodiments of the above-mentioned circuit protection switch, the upper end of the support plate has an upper pressure-bearing portion facing the blade, and the lower end of the support plate has a lower pressure-bearing portion facing the blade, the upper surface of the upper pressure-bearing portion is pressed and fitted with the edge of the pressure plate in the vertical direction, and the lower surface of the lower pressure-bearing portion is pressed and fitted with the upper surface of the thermal expansion component in the vertical direction.

[0016] In some embodiments of the above-mentioned circuit protection switch, the upper surface of the upper pressure-bearing part is provided with an upper positioning step surface, the edge of the pressure-bearing plate is pressed on the upper positioning step surface, and the side wall of the pressure-bearing plate abuts against the side wall of the upper positioning step surface; the lower surface of the lower pressure-bearing part is provided with a lower positioning step surface, the upper surface of the thermal expansion part is pressed on the lower positioning step surface, and the side wall of the thermal expansion part abuts against the side wall of the lower positioning step surface.

[0017] In some embodiments of the above-mentioned circuit protection switch, a bending strength configuration groove is provided on the support plate close to the blade, and the bending strength configuration groove passes through the front and rear sides of the support plate in the front-to-back direction. The bending strength configuration groove is located in the middle position between the upper and lower ends of the support plate.

[0018] In some embodiments of the above-mentioned circuit protection switch, a U-shaped groove with an opening facing downward is provided at the lower end of the thermal expansion member, the central axis of the U-shaped groove is parallel to the left-right direction, the inner wall of the U-shaped groove is suitable for being pressed tightly with the outer sheath of the wire, and a first closed cavity is provided inside the thermal expansion member, and the first closed cavity is filled with a fluid-state thermal expansion material.

[0019] In some embodiments of the above-mentioned circuit protection switch, the top surface of the thermal expansion component has an upward protrusion near the blade, and a second closed cavity is provided in the protrusion. The first closed cavity and the second closed cavity are connected, and the top surface of the protrusion is set to a thin-wall structure.

[0020] In some embodiments of the circuit protection switch, a knife groove is provided on the upper surface of the bottom plate, and the knife groove is located directly below the blade. The blade is inserted into the knife groove after cutting the wire downward.

[0021] Effects of the Invention

[0022] The thermal expansion component utilizes the principle of thermal expansion and contraction. When the temperature of the wire sheath rises, the thermal expansion component expands and squeezes the support piece. The support piece bends and deforms after being compressed. The relative inclination of the upper end of the support piece and the extrusion surface of the knife holder increases, and the relative inclination of the lower end of the support piece and the extrusion surface of the thermal expansion component increases. When the temperature of the wire sheath is too high, the inclination of the extrusion surfaces at the upper and lower ends of the support piece reaches the disengagement condition, and the support piece will pop out in the direction away from the blade. The knife holder loses its supporting force and moves downward rapidly under the elastic force of the stored force spring, pushing the blade to punch and cut the wire, cutting the wire. The circuit protection switch of this application does not depend on the current in the wire and does not require power function. It can prevent the wire from being overheated due to environmental factors, which eventually leads to the burning or combustion of the wire sheath, thereby protecting the circuit. During maintenance, you only need to reconnect the cut part. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

[0024] FIG1 is a schematic structural diagram of a circuit protection switch according to an embodiment of the present application;

[0025] FIG2 is a cross-sectional view along line AA in FIG1 ;

[0026] FIG3 is a schematic structural diagram of a support sheet in an embodiment of the present application;

[0027] FIG4 is a schematic structural diagram of a thermal expansion member in an embodiment of the present application;

[0028] FIG5 is a cross-sectional view taken along line BB in FIG4 .

[0029] Explanation of the reference numerals 100, blade; 102, support plate; 104, thermal expansion member; 106, force storage spring; 108, top plate; 110, bottom plate; 112, front side plate; 114, rear side plate; 116, adjusting bolt; 118, screw hole; 120, clamping block; 122, pressure plate; 124, guide rod; 126, guide cylinder; 128, upper pressure part; 130, lower pressure part; 132, upper positioning step surface; 134, lower positioning step surface; 136, bending strength configuration groove; 138, U-shaped groove; 140, first enclosed cavity; 142, protrusion; 144, second enclosed cavity; 146, knife groove; 148, wire. DETAILED DESCRIPTION

[0030] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated. The special word "exemplary" here means "used as an example, embodiment or illustrative". Any embodiment described here as "exemplary" is not necessarily interpreted as being superior or better than other embodiments. In addition, in order to better illustrate the present application, those skilled in the art will understand that numerous specific details are given in each embodiment below. The present application can also be implemented without certain specific details. In some embodiments, methods, means and elements well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0031] In combination with Figures 1 to 3, the present application provides a circuit protection switch, including a bracket, a knife holder, a blade 100, a support sheet 102, a thermal expansion member 104, and a force storage spring 106; the blade 100 is vertically fixedly connected to the bottom of the knife holder, the cutting edge of the blade 100 is set vertically downward, the knife holder and the bracket are slidably connected in the vertical direction, the force storage spring 106 is connected in the vertical direction, the upper end of the force storage spring 106 is fixedly connected to the bracket, and the lower end of the force storage spring 106 is fixedly connected to the knife holder, and the force storage spring 106 is in a compressed state; a horizontal limiting surface is provided on the bracket, the thermal expansion member 104 and the blade 100 and the knife holder are located above the limiting surface, the lower end of the thermal expansion member 104 is pressed and matched with the limiting surface, the thermal expansion member 104 is suitable for pressing and matching with the outer skin of the wire 148, and the thermal expansion member 104 is located below the knife holder; the support sheet 102 is located between the knife holder and the thermal expansion member 104, and the shape of the support sheet 102 is C-shaped. The C-shaped opening of the support piece 102 faces the blade 100, the upper end of the support piece 102 is pressed and fitted with the tool holder in the vertical direction, and the lower end of the support piece 102 is pressed and fitted with the thermal expansion piece 104 in the vertical direction; after being heated, the thermal expansion piece 104 expands and squeezes the support piece 102 to reduce the C-shaped opening of the support piece 102. After the C-shaped opening of the support piece 102 is reduced, the upper end of the support piece 102 can slide off from under the tool holder in the direction away from the blade 100, and / or, the lower end of the support piece 102 can slide off from above the thermal expansion piece 104 in the direction away from the blade 100; an insulation arrangement is provided between the left side of the blade 100 and the right side of the blade 100 (the blade 100 is made of an insulating material, such as ceramic or diamond, or a composite material, for example, the cutting edge is made of tungsten steel and the blade body is made of ceramic, or the inside of the blade body and the cutting edge are made of tungsten steel, and the outer surface of the blade 100 is coated with an insulating material, such as ceramic or glaze).

[0032] The thermal expansion member 104 utilizes the principle of thermal expansion and contraction. When the temperature of the outer skin of the wire 148 increases, the thermal expansion member 104 expands and squeezes the support piece 102. The support piece bends and deforms after being compressed, and the relative inclination between the upper end of the support piece and the extrusion surface of the blade holder increases. The relative inclination between the lower end of the support piece 102 and the extrusion surface of the thermal expansion member 104 increases. When the temperature of the outer skin of the wire 148 is too high, the inclination of the extrusion surfaces at the upper and lower ends of the support piece 102 reaches a disengagement condition, and the support piece 102 will pop out in the direction away from the blade 100 (left and right direction). The blade holder loses its supporting force and moves downward rapidly under the elastic force of the force storage spring 106, pushing the blade 100 to punch the wire 148 and cut off the wire 148. The circuit protection switch of the present application does not depend on the current in the wire 148 and does not require power function. It can prevent the wire 148 from being burned or burned due to the environment in which it is located due to excessive temperature of the wire 148, thereby protecting the circuit. During maintenance, it is only necessary to reconnect the cut part. The execution temperature in the circuit protection switch of the present application (the temperature that can cause the thermal expansion component 104 to expand to pop out the support piece 102) is related to the bending strength of the support piece, the thermal expansion coefficient of the thermal expansion component 104 and the elastic force of the storage spring 106, and is also related to the position of the extrusion surfaces at the upper and lower ends of the support piece 102. The smaller the extrusion area between the upper end of the support piece 102 and the tool holder, and the smaller the extrusion area between the lower end of the support piece and the thermal expansion component 104, the easier it is for the support piece to pop out due to increased pressure.

[0033] In some embodiments of the above-mentioned circuit protection switch, the bracket includes a top plate 108, a bottom plate 110, a front side plate 112, a rear side plate 114, and an adjusting bolt 116. The upper ends of the front side plate 112 and the rear side plate 114 are respectively fixedly connected to the top plate 108, and the lower ends of the front side plate 112 and the rear side plate 114 are respectively spaced apart from the bottom plate 110. The lower end surfaces of the front side plate 112 and the rear side plate 114 are respectively provided with vertical screw holes 118. A through hole is provided on the bottom plate 110, and the adjusting bolt 116 passes through the through hole and is fixed to the bottom plate 110. The screw hole 118 is threadedly connected, and after rotating the adjusting bolt 116, the top plate 108 and the bottom plate 110 can be driven to move away from or towards each other; the limiting surface is composed of the upper surface of the bottom plate 110; the tool holder is located below the top plate 108, and the tool holder and the top plate 108 are slidingly connected in the vertical direction. The upper end of the force storage spring 106 is fixedly connected to the top plate 108, and the tool holder, force storage spring 106, blade 100, thermal expansion member 104, and support plate 102 are located between the front side plate 112 and the rear side plate 114.

[0034] By adjusting the adjusting bolt 116, the degree of compression of the force storage spring 106 is adjusted, thereby adjusting the elastic force generated by the force storage spring 106 on the tool holder, adjusting the pressure on the support plate 102, and finally adjusting the execution temperature. The greater the elastic force of the force storage spring 106, the lower the execution temperature and the higher the sensitivity. When in use, rotate the adjusting bolt 116. When the support plate 102 just pops out, record the distance between the lower end surfaces of the front side plate 112 and the rear side plate 114 and the upper surface of the base plate 110 as the critical distance. At this time, the bending degree of the support plate 102 is used as the critical bending degree. Loosen the adjusting bolt 116 and clamp the support plate 102 between the tool holder and the thermal expansion member 104 again. Tighten the adjusting bolt 116 until the distance between the lower end surfaces of the front side plate 112 and the rear side plate 114 and the upper surface of the base plate 110 is close to the critical distance. During operation, when the thermal expansion member 104 expands due to heat, the bending degree of the support plate reaches the critical bending degree and it will pop out.

[0035] In some embodiments of the above-mentioned circuit protection switch, the blade holder includes a clamping block 120, a pressure plate 122, and a guide rod 124 fixedly connected in sequence from bottom to top. The upper side of the blade 100 is fixedly connected to the clamping block 120, the guide rod 124 is vertically arranged, and the lower surface of the top plate 108 is fixedly connected with a vertical guide cylinder 126. The guide rod 124 and the guide cylinder 126 are plugged in the vertical direction. The guide cylinder 126 is located on the inner side of the force storage spring 106, and the lower end of the force storage spring 106 is fixedly connected to the upper surface of the pressure plate 122. The lower end surface of the guide cylinder 126 is spaced apart from the upper surface of the pressure plate 122, and the upper end surface of the guide rod 124 is spaced apart from the lower surface of the top plate 108.

[0036] In some embodiments of the circuit protection switch, a pair of support pieces 102 and a pair of thermal expansion elements 104 are respectively provided and symmetrically arranged on the left and right sides of the blade 100 , thereby improving the support stability of the left and right ends of the pressure plate 122 .

[0037] In some embodiments of the aforementioned circuit protection switch, the upper end of the support piece 102 has an upper pressure-bearing portion 128 facing the blade 100, and the lower end of the support piece 102 has a lower pressure-bearing portion 130 facing the blade 100. The upper surface of the upper pressure-bearing portion 128 is vertically pressed against the edge of the pressure plate 122, and the lower surface of the lower pressure-bearing portion 130 is vertically pressed against the upper surface of the thermal expansion element 104. This facilitates bending deformation of the support piece 102 under pressure (when bending, the C-shaped opening decreases).

[0038] As shown in Figure 3, in some embodiments of the above-mentioned circuit protection switch, the upper surface of the upper pressure-bearing part 128 is provided with an upper positioning step surface 132, the edge of the pressure-bearing plate 122 is pressed on the upper positioning step surface 132, and the side wall of the pressure-bearing plate 122 is abutted against the side wall of the upper positioning step surface 132; the lower surface of the lower pressure-bearing part 130 is provided with a lower positioning step surface 134, the upper surface of the thermal expansion part 104 is pressed on the lower positioning step surface 134, and the side wall of the thermal expansion part 104 is abutted against the side wall of the lower positioning step surface 134.

[0039] The positioning step surface is used for installation positioning to eliminate installation errors (different extrusion areas will affect the execution temperature). Under the positioning of the positioning step surface, each installation is consistent with the preset extrusion area, and the execution temperature will not change. At this time, the only factor that changes the execution temperature is the elastic force of the storage spring 106, which is adjusted by adjusting the bolt 116.

[0040] In some embodiments of the above-mentioned circuit protection switch, a bending strength configuration groove 136 is provided on the support plate 102 near the blade 100. The bending strength configuration groove 136 passes through the front and rear sides of the support plate 102 in the front-to-back direction. The bending strength configuration groove 136 is located in the middle position between the upper and lower ends of the support plate 102.

[0041] During the production process of the support sheet 102, processing errors may cause the bending strength of each support sheet 102 to be inconsistent. During the quality inspection test, a bending strength configuration groove 136 of a suitable size can be processed by grinding the side wall of the support sheet 102 with a file until the bending strength reaches the expected value.

[0042] As shown in Figures 4 and 5, in some embodiments of the above-mentioned circuit protection switch, the lower end of the thermal expansion member 104 is provided with a U-shaped groove 138 with an opening facing downward, the central axis of the U-shaped groove 138 is parallel to the left and right directions, and the inner wall of the U-shaped groove 138 is suitable for being pressed tightly with the outer skin of the wire 148. The interior of the thermal expansion member 104 is provided with a first closed cavity 140, and the first closed cavity 140 is filled with a fluid-state thermal expansion material.

[0043] The thermal expansion material is preferably mercury (mercury has a larger thermal expansion coefficient), which can increase the sensitivity of the support piece to pop out due to temperature rise. The thermal expansion material can also be made of other materials with higher thermal expansion coefficients.

[0044] In some embodiments of the above-mentioned circuit protection switch, the top surface of the thermal expansion member 104 has an upward protrusion 142 close to the blade 100, and a second enclosed cavity 144 is provided in the protrusion 142. The first enclosed cavity 140 and the second enclosed cavity 144 are connected, and the top surface of the protrusion 142 is set to a thin-wall structure.

[0045] Except for the top surface of the protrusion 142, the other side walls of the thermal expansion member 104 are set to have a wall thickness of more than 5 mm, and the top surface of the protrusion 142 is set to have a wall thickness of 0.5 mm. When the fluid thermal expansion material expands due to heat, it can push up the top surface of the protrusion 142, thereby squeezing the lower end of the support piece 102.

[0046] In some embodiments of the circuit protection switch, a knife groove 146 is provided on the upper surface of the base plate 110 . The knife groove 146 is located directly below the blade 100 . The blade 100 is inserted into the knife groove 146 after cutting the wire 148 downward.

[0047] It should be noted that “up, down, left, right, front, and back” refer to the viewing directions in the accompanying drawings, as indicated by the arrows with directions in the drawings.

[0048] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A circuit protection switch, characterized in that: It comprises a support, a knife holder, a blade (100), a support sheet (102), a thermal expansion member (104), and a force storage spring (106); The blade (100) is vertically fixedly connected below the blade holder, the cutting edge of the blade (100) is vertically arranged downward, the blade holder and the bracket are slidably connected in the vertical direction, the force storage spring (106) is connected in the vertical direction, the upper end of the force storage spring (106) is fixedly connected to the bracket, the lower end of the force storage spring (106) is fixedly connected to the blade holder, and the force storage spring (106) is in a compressed state; The bracket is provided with a horizontal limit surface, the heat expansion element (104), the blade (100) and the knife holder are located above the limit surface, the lower end of the heat expansion element (104) is pressed and matched with the limit surface, the heat expansion element (104) is suitable for being pressed and matched with the outer skin of the wire (148), and the heat expansion element (104) is located below the knife holder; The support sheet (102) is located between the tool holder and the heat expansion member (104), the support sheet (102) is C-shaped, the C-shaped opening of the support sheet (102) faces the blade (100), the upper end of the support sheet (102) is pressed and matched with the tool holder in the vertical direction, and the lower end of the support sheet (102) is pressed and matched with the heat expansion member (104) in the vertical direction; After being heated, the heat-expandable component (104) expands and squeezes the support sheet (102), thereby reducing the C-shaped opening of the support sheet (102). After the C-shaped opening of the support sheet (102) is reduced, the upper end of the support sheet (102) can slide off from under the knife holder in a direction away from the blade (100), and / or the lower end of the support sheet (102) can slide off from above the heat-expandable component (104) in a direction away from the blade (100); The left side surface of the blade (100) and the right side surface of the blade (100) are insulated from each other.

2. The circuit protection switch according to claim 1, characterized in that: The bracket comprises a top plate (108), a bottom plate (110), a front side plate (112), a rear side plate (114), and an adjusting bolt (116); the upper ends of the front side plate (112) and the rear side plate (114) are respectively fixedly connected to the top plate (108); the lower ends of the front side plate (112) and the rear side plate (114) are respectively spaced apart from the bottom plate (110); the lower end surfaces of the front side plate (112) and the rear side plate (114) are respectively provided with vertical screw holes (118); the bottom plate (110) is provided with a through hole; the adjusting bolt (116) passes through the through hole and is threadedly connected to the screw hole (118); and the adjusting bolt (116) is screwed into the bottom plate (110) to secure the bottom plate (110). After turning the adjusting bolt (116), the top plate (108) and the bottom plate (110) can be driven to move in directions away from or towards each other; the limiting surface is formed by the upper surface of the bottom plate (110); the tool holder is located below the top plate (108), the tool holder is slidably connected to the top plate (108) in the vertical direction, the upper end of the force storage spring (106) is fixedly connected to the top plate (108), and the tool holder, the force storage spring (106), the blade (100), the thermal expansion member (104), and the support plate (102) are located between the front side plate (112) and the rear side plate (114).

3. The circuit protection switch according to claim 2, characterized in that: The tool holder comprises a clamping block (120), a pressure plate (122), and a guide rod (124) which are fixedly connected in sequence from bottom to top. The upper side of the blade (100) is fixedly connected to the clamping block (120). The guide rod (124) is vertically arranged. The lower surface of the top plate (108) is fixedly connected with a vertical guide cylinder (126). The guide rod (124) and the guide cylinder (126) are plugged in the vertical direction. The guide cylinder (126) is located on the inner side of the force storage spring (106). The lower end of the force storage spring (106) is fixedly connected to the upper surface of the pressure plate (122). The lower end surface of the guide cylinder (126) is spaced apart from the upper surface of the pressure plate (122). The upper end surface of the guide rod (124) is spaced apart from the lower surface of the top plate (108).

4. The circuit protection switch according to claim 3, characterized in that: The supporting sheet (102) and the heat expansion member (104) are provided in a pair respectively and are symmetrically arranged on the left and right sides of the blade (100).

5. The circuit protection switch according to claim 3, characterized in that: The upper end of the support plate (102) has an upper pressure-bearing portion (128) facing the blade (100), and the lower end of the support plate (102) has a lower pressure-bearing portion (130) facing the blade (100). The upper surface of the upper pressure-bearing portion (128) is pressed and fitted with the edge of the pressure plate (122) in the vertical direction, and the lower surface of the lower pressure-bearing portion (130) is pressed and fitted with the upper surface of the heat expansion member (104) in the vertical direction.

6. The circuit protection switch according to claim 5, characterized in that: The upper surface of the upper pressure-bearing portion (128) is provided with an upper positioning step surface (132), the edge of the pressure-bearing plate (122) is pressed on the upper positioning step surface (132), and the side wall of the pressure-bearing plate (122) abuts against the side wall of the upper positioning step surface (132); the lower surface of the lower pressure-bearing portion (130) is provided with a lower positioning step surface (134), the upper surface of the heat-expandable component (104) is pressed on the lower positioning step surface (134), and the side wall of the heat-expandable component (104) abuts against the side wall of the lower positioning step surface (134).

7. The circuit protection switch according to claim 3, characterized in that: A bending strength configuration groove (136) is provided on a portion of the support sheet (102) close to the blade (100). The bending strength configuration groove (136) runs through the front and rear sides of the support sheet (102) along the front-to-back direction. The bending strength configuration groove (136) is located in the middle position between the upper and lower ends of the support sheet (102).

8. The circuit protection switch according to claim 3, characterized in that: The lower end of the thermal expansion component (104) is provided with a U-shaped groove (138) with an opening facing downward, the central axis of the U-shaped groove (138) is parallel to the left-right direction, the inner wall of the U-shaped groove (138) is suitable for being pressed and fitted with the outer skin of the wire (148), and the interior of the thermal expansion component (104) is provided with a first closed cavity (140), and the first closed cavity (140) is filled with a thermal expansion material in a fluid state.

9. The circuit protection switch according to claim 8, characterized in that: The top surface of the heat expansion component (104) has an upward protrusion (142) on one side close to the blade (100), a second closed cavity (144) is provided in the protrusion (142), the first closed cavity (140) and the second closed cavity (144) are connected, and the top surface of the protrusion (142) is set as a thin-wall structure.

10. The circuit protection switch according to claim 3, characterized in that: The upper surface of the bottom plate (110) is provided with a knife groove (146), and the knife groove (146) is located directly below the blade (100). The blade (100) is inserted into the knife groove (146) after cutting the electric wire (148) downward.

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