A waterproof circuit protection device

Abstract

The invention discloses a waterproof circuit protection device, comprising a base, a protection box is arranged above the base, a bottom plate is installed at the bottom end of the protection box, a circuit device placement cavity is formed inside the protection box, a sealing waterproof component is installed between the base and the bottom plate, the sealing waterproof component is used for waterproofing and sealing the circuit device placement cavity, the sealing waterproof component comprises a square plate fixedly installed on the top of the base, a sealing gasket is fixedly installed on the top of the outer wall of the square plate, the top wall of the sealing gasket is tightly attached to the bottom wall of the bottom plate, a pressure plate is sleeved on the outer side of the square plate, and the pressure plate is located below the sealing gasket; according to the invention, when the humidity in the environment is high, the quicklime in the water absorption and heat generation bag absorbs water and generates heat, and the gas expands due to the heat and pushes the piston to move upward, compressing the first spring, so that the pressure plate presses the sealing gasket upward, thereby improving the sealing and waterproof effect between the square plate and the bottom plate, and improving the circuit waterproof protection effect.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit protection devices, and in particular relates to a waterproof circuit protection device. Background Art

[0002] In modern life, various switches are needed in new energy vehicles (such as electric vehicles). The protective shell of the switch is usually directly covered on the outside of the switch. A circuit device placement cavity is provided in the protective shell. The protective shell can protect the switch and other circuit devices in the circuit device placement cavity, and protect the inside of the circuit device placement cavity through the sealing ring on the shell, etc. However, there are the following defects: Since the operating environments of automobiles are different, when the humidity in the operating environment is high or there is water seepage around, air containing moisture may enter the protective shell through the gaps in the protective shell and come into contact with the circuit equipment in the protective shell, thereby causing corrosion damage to the circuit equipment. Summary of the invention

[0003] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a waterproof circuit protection device, which effectively solves the problem that air with moisture may enter the protective shell through the gaps in the protective shell and cause damage to the circuit equipment.

[0004] To achieve the above object, the present invention provides the following technical solutions: a waterproof circuit protection device, comprising a base, a protection box is provided above the base, a bottom plate is installed at the bottom end of the protection box, a circuit device placement cavity is formed inside the protection box, a sealing waterproof component is installed between the base and the bottom plate, and the sealing waterproof component is used to provide waterproof and sealed protection for the circuit device placement cavity; The sealing and waterproof component includes a U-shaped plate fixedly installed on the top of the base, a sealing gasket is fixedly installed on the top of the outer wall of the U-shaped plate, the top wall of the sealing gasket is tightly attached to the bottom wall of the base plate, a pressure plate is sleeved on the outer side of the U-shaped plate, the pressure plate is located below the sealing gasket, a plurality of upper pressure sealing units are installed between the base and the pressure plate, the upper pressure sealing units are used to drive the pressure plate to press the sealing gasket when the ambient humidity is high, and a plurality of clip-on fixing units are installed on the outer side of the base, the clip-on fixing units are used to generate downward pressure on the base plate when the ambient humidity is high.

[0005] Preferably, positioning grooves are provided at the four corners of the U-shaped plate, positioning columns are installed at the four corners of the bottom end of the base plate, the positioning columns are inserted into the positioning grooves, screw barrels are installed at the four corners of the top end of the base, bolts are installed at the four corners of the base plate, and the bolts are threadedly connected to the screw barrels.

[0006] Preferably, the upper pressure sealing unit includes a fixed cylinder fixedly installed on the top of the base, a top groove is opened at the top of the fixed cylinder, a movable plate is installed inside the fixed cylinder, a top rod is installed on the top of the piston, the top rod passes through the top groove and is fixedly connected to the bottom wall of the pressure plate, a piston is movably installed inside the fixed cylinder, the piston is located below the movable plate, and a first spring is installed between the piston and the movable plate.

[0007] Preferably, the outer wall of the piston is in close contact with the inner wall of the fixed cylinder, a limiting ring is fixedly installed inside the fixed cylinder, the bottom wall of the piston is in contact with the top wall of the limiting ring, an air storage chamber is formed inside the fixed cylinder in the space below the piston, the air storage chamber is filled with heated and expanded gas, and a wetting and heating component is installed outside the fixed cylinder.

[0008] Preferably, the wet heating component includes a heat-conducting ring sleeved on the outside of the U-shaped plate, a heat-conducting box is fixedly installed on one side of the heat-conducting ring, and connecting holes are evenly opened on the heat-conducting box. A water-absorbing heat-generating bag is placed inside the heat-absorbing heat-generating bag. The internal material of the water-absorbing heat-generating bag is quicklime. A top cover is installed on the top of the heat-conducting box, and the materials of the heat-conducting ring, the heat-conducting box and the U-shaped plate are all heat-conducting materials.

[0009] Preferably, the snap-on fixing unit includes a vertical plate fixedly mounted on the side wall of the base, the vertical plate is located on the side of the fixing tube away from the U-shaped plate, a movable groove is opened on the vertical plate, guide rods are symmetrically mounted inside the movable groove, a movable block is movably mounted inside the movable groove, the movable block is slidably connected to the guide rod, a second spring is symmetrically mounted on the bottom end of the movable block, and the bottom end of the second spring is fixedly connected to the inner bottom wall of the movable groove.

[0010] Preferably, a plate groove is provided on the movable block, and a clamping plate is movably installed inside the plate groove, one end of the clamping plate is inserted into the inside of the clamping groove, the clamping groove is provided on the side wall of the bottom plate, and a third spring is fixedly installed on one end of the clamping plate located inside the plate groove, one end of the third spring is fixedly connected to the inner wall of the plate groove, a pull rod is installed at one end of the clamping plate, the pull rod passes through the outside of the movable block, and a downward pressure sealing unit is installed between the clamping plate and the piston.

[0011] Preferably, the downward pressure sealing unit includes a longitudinal groove opened on the card plate, a longitudinal plate is longitudinally slidably installed inside the longitudinal groove, a top plate is fixedly installed at the top of the longitudinal plate, a fourth spring is symmetrically installed at the bottom end of the top plate, the bottom end of the fourth spring is fixedly connected to the top wall of the card plate, a first tooth plate is fixedly installed at the bottom end of the longitudinal plate, a side of the first tooth plate away from the vertical plate is meshed with a gear, and a side of the gear away from the first tooth plate is meshed with a second tooth plate.

[0012] Preferably, an external frame is sleeved on the outer side of the first tooth plate, the external frame and the gear, the gear is rotatably connected to the external frame, a transverse groove is fixedly installed on the side of the external frame close to the vertical plate, the transverse groove is slidably installed inside the transverse plate, the transverse plate is opened on the vertical plate, a top block is fixedly installed on the top of the second tooth plate, and a slot is opened on the side of the top block away from the vertical plate.

[0013] Preferably, a rod groove is provided inside the top rod, a side groove is provided on the side of the rod groove close to the vertical plate, a push rod is fixedly installed on the top end of the piston, the top end of the push rod is inserted into the rod groove, an insertion rod is installed on one side of the push rod, the insertion rod is located inside the side groove, and when the card plate is inserted into the card slot, the insertion rod is inserted into the slot.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1) During operation, a sealing gasket is provided between the square plate and the bottom plate, and a pressure plate is provided under the sealing gasket. When the humidity in the environment is high, the quicklime in the water-absorbing and heating bag absorbs water and generates heat, and transfers the heat to the gas storage cavity. The gas expands due to the heat and pushes the piston upward, compressing the first spring, so that the pressure plate presses the sealing gasket upward, thereby improving the sealing and waterproof effect between the square plate and the bottom plate, and improving the waterproof protection effect of the circuit; 2) During operation, when the piston moves upward, the second tooth plate is pulled upward by the insertion rod, and then the first tooth plate is driven downward by the gear, thereby pulling the longitudinal plate downward, so that the fourth spring is continuously compressed, thereby generating downward pressure on the card plate through the fourth spring, further pressing the sealing gasket with the mouth-shaped plate and the bottom plate, and further improving the waterproof protection effect of the circuit; 3) During operation, a vertical plate is installed on the side wall of the base. When installing, when the card plate moves toward the side of the bottom plate, the card plate moves toward the side of the card slot, thereby improving the card connection stability between the base and the protection box. At the same time, the push rod is inserted into the slot, which facilitates the synchronous movement of the piston and the second tooth plate, and facilitates sealing and waterproof protection. At the same time, the card plate is inserted into the card slot, which can cause the card plate to exert downward pressure on the bottom plate, thereby improving sealing and waterproof protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0016] In the attached picture: Figure 1 It is a schematic structural diagram of a waterproof circuit protection device of the present invention; Figure 2 It is a schematic diagram of the base structure of the present invention; Figure 3It is a schematic diagram of the structure of the protection box of the present invention; Figure 4 It is a schematic diagram of the structure of the sealing and waterproofing assembly of the present invention; Figure 5 It is a schematic diagram of the structure of the upper pressure sealing unit of the present invention; Figure 6 It is a schematic diagram of the piston and top rod structure of the present invention; Figure 7 It is a schematic diagram of the vertical plate structure of the present invention; Figure 8 It is a schematic diagram of the card board structure of the present invention; Fig. 9 For the present invention Figure 7 Enlarged structural diagram at A in the middle.

[0017] In the figure: 1, base; 2, protection box; 3, bottom plate; 4, screw barrel; 5, bolt; 7, sealing and waterproofing assembly; 701, mouth-shaped plate; 702, positioning groove; 703, positioning column; 704, card slot; 705, sealing gasket; 706, pressure plate; 707, upper pressure sealing unit; 7071, fixed cylinder; 7072, top groove; 7073, limit ring; 7074, piston; 7075, air storage chamber; 7076, movable plate; 7077, top rod; 7078, first spring; 7079, heat conduction ring; 70710, heat conduction box; 70711, water absorption and heating bag; 70712, connecting hole; 70713, top cover; 708, card fixing unit; 7081 , vertical plate; 7082, movable groove; 7083, guide rod; 7084, movable block; 7085, second spring; 7086, plate groove; 7087, clamping plate; 7088, third spring; 7089, pull rod; 709, press-down sealing unit; 7091, rod groove; 7092, side groove; 7093, push rod; 7094, insert rod; 7095, longitudinal groove; 7096, longitudinal plate; 7097, top plate; 7098, fourth spring; 7099, first tooth plate; 70910, external frame; 70911, gear; 70912, second tooth plate; 70913, top block; 70914, slot; 70915, transverse groove; 70916, transverse plate. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] Depend on Figure 1-9The present invention relates to a waterproof circuit protection device, comprising a base 1, a protection box 2 is provided above the base 1, a bottom plate 3 is installed at the bottom end of the protection box 2, a circuit device placement cavity is formed inside the protection box 2, a sealing waterproof component 7 is installed between the base 1 and the bottom plate 3, and the sealing waterproof component 7 is used for waterproofing and sealing the circuit device placement cavity.

[0020] The sealing and waterproofing assembly 7 includes a square plate 701 fixedly mounted on the top of the base 1, a sealing gasket 705 is fixedly mounted on the top of the outer wall of the square plate 701, the top wall of the sealing gasket 705 is tightly attached to the bottom wall of the bottom plate 3, a pressing plate 706 is sleeved on the outer side of the square plate 701, and the pressing plate 706 is located below the sealing gasket 705. A plurality of upper pressure sealing units 707 are installed between the base 1 and the pressing plate 706. The upper pressure sealing units 707 are used to drive the pressing plate 706 to press the sealing gasket when the ambient humidity is high. 705 is pressed tightly, and multiple clamping fixing units 708 are installed on the outer side of the base 1. The clamping fixing units 708 are used to generate downward pressure on the bottom plate 3 when the ambient humidity is high. Positioning grooves 702 are opened at the four corners of the square plate 701, and positioning columns 703 are installed at the four corners of the bottom end of the bottom plate 3. The positioning columns 703 are inserted into the interior of the positioning grooves 702. Screw barrels 4 are installed at the four corners of the top end of the base 1, and bolts 5 are installed at the four corners of the bottom plate 3. The bolts 5 are threadedly connected with the screw barrel 4.

[0021] The upper pressure sealing unit 707 includes a fixed cylinder 7071 fixedly mounted on the top of the base 1, a top groove 7072 is provided on the top of the fixed cylinder 7071, a movable plate 7076 is installed inside the fixed cylinder 7071, a top rod 7077 is installed on the top of the piston 7074, the top rod 7077 passes through the top groove 7072 and is fixedly connected to the bottom wall of the pressure plate 706, a piston 7074 is movably installed inside the fixed cylinder 7071, the piston 7074 is located below the movable plate 7076, and the piston 7074 and the movable plate A first spring 7078 is installed between the piston 7074 and the inner wall of the fixed cylinder 7071. The outer wall of the piston 7074 is in close contact with the inner wall of the fixed cylinder 7071. A limiting ring 7073 is fixedly installed inside the fixed cylinder 7071. The bottom wall of the piston 7074 contacts the top wall of the limiting ring 7073. The fixed cylinder 7071 is located in the space below the piston 7074 to form an air storage chamber 7075. The air storage chamber 7075 is filled with heated and expanded gas. A moistening and heating component is installed outside the fixed cylinder 7071. The moistening and heating component includes a sleeve mounted on the square plate 701 The outer heat-conducting ring 7079, a heat-conducting box 70710 is fixedly installed on one side of the heat-conducting ring 7079, and the heat-conducting box 70710 is evenly provided with connecting holes 70712. A water-absorbing heating bag 70711 is placed inside the heat-conducting box 70710. The internal material of the water-absorbing heating bag 70711 is quicklime. A top cover 70713 is installed on the top of the heat-conducting box 70710. The material of the heat-conducting ring 7079, the material of the heat-conducting box 70710 and the material of the square-shaped plate 701 are all heat-conducting materials. The square-shaped plate 701 A sealing gasket 705 is provided between the bottom plate 3 for sealing, and a pressure plate 706 is provided below the sealing gasket 705. When the humidity in the environment is high, the quicklime in the water-absorbing and heating bag 70711 absorbs water and generates heat, and transfers the heat to the air storage chamber 7075. The heat-expanding gas pushes the piston 7074 to move upward after expansion, compressing the first spring 7078, so that the pressure plate 706 presses the sealing gasket 705 upward, thereby improving the sealing and waterproof effect between the mouth-shaped plate 701 and the bottom plate 3, and improving the waterproof protection effect of the circuit.

[0022] The clamping fixing unit 708 includes a vertical plate 7081 fixedly mounted on the side wall of the base 1, the vertical plate 7081 is located on the side of the fixed cylinder 7071 away from the square plate 701, and a movable groove 7082 is opened on the vertical plate 7081. A guide rod 7083 is symmetrically mounted inside the movable groove 7082. A movable block 7084 is movably mounted inside the movable groove 7082. The movable block 7084 is slidably connected to the guide rod 7083. A second spring 7085 is symmetrically mounted on the bottom end of the movable block 7084. The bottom end of the second spring 7085 is fixedly connected to the inner bottom wall of the movable groove 7082. The movable block 7084 is symmetrically mounted on the bottom end of the movable block 7084. 084 is provided with a plate groove 7086, and a clamping plate 7087 is movably installed inside the plate groove 7086. One end of the clamping plate 7087 is inserted into the inside of the clamping groove 704. The clamping groove 704 is provided on the side wall of the bottom plate 3. A third spring 7088 is fixedly installed on one end of the clamping plate 7087 located inside the plate groove 7086. One end of the third spring 7088 is fixedly connected to the inner wall of the plate groove 7086. A pull rod 7089 is installed at one end of the clamping plate 7087. The pull rod 7089 extends to the outer side of the movable block 7084. A downward pressure sealing unit 709 is installed between the clamping plate 7087 and the piston 7074.

[0023] The downward pressing sealing unit 709 includes a longitudinal groove 7095 provided on the card plate 7087, a longitudinal plate 7096 is longitudinally slidably installed inside the longitudinal groove 7095, a top plate 7097 is fixedly installed on the top of the longitudinal plate 7096, a fourth spring 7098 is symmetrically installed on the bottom end of the top plate 7097, the bottom end of the fourth spring 7098 is fixedly connected to the top wall of the card plate 7087, a first tooth plate 7099 is fixedly installed on the bottom end of the longitudinal plate 7096, a side of the first tooth plate 7099 away from the vertical plate 7081 is meshedly connected with a gear 70911, a side of the gear 70911 away from the first tooth plate 7099 is meshedly connected with a second tooth plate 70912, the first tooth plate 7099, The outer frame 70910 and the outer side of the gear 70911 are sleeved with the outer frame 70910, and the gear 70911 is rotatably connected with the outer frame 70910. When the piston 7074 moves upward, the second tooth plate 70912 is pulled upward by the insertion rod 7094, and then the first tooth plate 7099 is driven to move downward through the gear 70911, thereby pulling the longitudinal plate 7096 downward, so that the fourth spring 7098 is continuously compressed, thereby generating a downward pressure on the card plate 7087 through the fourth spring 7098, further pressing the seal gasket 705 with the mouth-shaped plate 701 and the bottom plate 3, and further improving the circuit waterproof protection effect. The outer frame 70910 is close to the vertical plate 7081 A transverse groove 70915 is fixedly installed on one side of the second tooth plate 70912, and the transverse groove 70915 is slidably installed inside the transverse plate 70916. The transverse plate 70916 is opened on the vertical plate 7081. A top block 70913 is fixedly installed on the top of the second tooth plate 70912. A slot 70914 is opened on the side of the top block 70913 away from the vertical plate 7081. A rod groove 7091 is opened inside the top rod 7077, and a side groove 7092 is opened on the side of the rod groove 7091 close to the vertical plate 7081. A push rod 7093 is fixedly installed on the top of the piston 7074. The top of the push rod 7093 is inserted into the rod groove 7091. A plug rod 7094 is installed on one side of the push rod 7093. 94 is located on the inner side of the side groove 7092. When the card plate 7087 is inserted into the card slot 704, the insertion rod 7094 is inserted into the slot 70914. A vertical plate 7081 is installed on the side wall of the base 1. During installation, when the card plate 7087 moves toward the side of the bottom plate 3, the card plate 7087 moves toward the side of the card slot 704, thereby improving the card connection stability between the base 1 and the protective box 2. At the same time, the push rod 7093 is inserted into the slot 70914 to facilitate the synchronous movement of the piston 7074 and the second tooth plate 70912, thereby facilitating the sealing and waterproof protection. At the same time, the card plate 7087 is inserted into the card slot 704, which can cause the card plate 7087 to exert downward pressure on the bottom plate 3, thereby improving the sealing and waterproof protection.

[0024] Working principle: When working, first install the circuit equipment such as switches in the circuit equipment placement cavity inside the protection box 2, and then install the bottom plate 3 on the top of the base 1, so that the top wall of the sealing gasket 705 contacts the bottom wall of the bottom plate 3, and then screw the bolts 5 on the bottom plate 3 into the inside of the screw barrel 4, so as to fix the base 1 and the bottom plate 3, and insert the positioning column 703 into the positioning groove 702. At this time, the sealing gasket 705 between the square plate 701 and the bottom plate 3 seals and waterproofs the inside of the circuit equipment placement cavity; During installation, the pull rod 7089 in the movable block 7084 on the vertical plate 7081 is pulled outward. After installation, the pull rod 7089 is released, so that the clamping plate 7087 is clamped into the clamping groove 704 under the elastic force of the third spring 7088, thereby clamping and fixing the base 1 and the bottom plate 3, improving the fixing strength of the base 1 and the protection box 2. When the clamping plate 7087 moves toward the side of the bottom plate 3, it drives the longitudinal plate 7096 to move toward the side of the bottom plate 3, thereby pushing the external frame 70910 to move toward the side of the fixed cylinder 7071, so that the end of the plug rod 7094 is clamped into the slot 70914 on the top block 70913; When the humidity of the external environment is high, air enters the heat conduction box 70710 through the connecting hole 70712, so that the air contacts the water absorption heating bag 70711, and the water absorption heating bag 70711 contains quicklime. When the quicklime contacts the moisture in the air, the quicklime absorbs the moisture and generates heat. Since the heat conduction box 70710 and the heat conduction ring 7079 are made of heat conducting materials, the heat of the quicklime is transferred to the fixed cylinder 7071 through the heat conduction box 70710 and the heat conduction ring 7079. At this time, the heated and expanded gas inside the air storage cavity 7075 The piston 7074 is pushed upward by the heat expansion, and the top end of the top rod 7077 is fixedly connected to the pressure plate 706, and the top wall of the pressure plate 706 contacts the bottom wall of the sealing pad 705, so that the piston 7074 moves toward the movable plate 7076, so that the first spring 7078 is compressed, so that the pressure plate 706 presses the sealing pad 705 tightly, thereby further improving the sealing and waterproof effect of the circuit device placement cavity and improving the waterproof protection of the circuit. The top cover 70713 needs to be opened within a period of time to replace the water-absorbing heating bag 70711; Since the end of the insertion rod 7094 is inserted into the slot 70914, when the limit ring 7073 moves upward, it drives the insertion rod 7094 to move upward, pushing the second tooth plate 70912 to move upward, and then drives the first tooth plate 7099 to move downward through the gear 70911, thereby pulling the longitudinal plate 7096 to move downward, so that the fourth spring 7098 is continuously compressed. Under the elastic force of the fourth spring 7098, the card plate 7087 exerts downward pressure on the bottom plate 3, thereby increasing the clamping force of the mouth-shaped plate 701 and the bottom plate 3 on the sealing gasket 705, thereby further improving the sealing and waterproof protection of the inside of the circuit device placement cavity.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A waterproof circuit protection device, comprising a base (1), characterized in that: A protection box (2) is provided above the base (1), a bottom plate (3) is installed at the bottom end of the protection box (2), a circuit device placement cavity is formed inside the protection box (2), a sealing waterproof component (7) is installed between the base (1) and the bottom plate (3), and the sealing waterproof component (7) is used to provide waterproof sealing protection for the circuit device placement cavity; The sealing and waterproofing assembly (7) comprises a square-shaped plate (701) fixedly mounted on the top of the base (1); a sealing gasket (705) is fixedly mounted on the top of the outer wall of the square-shaped plate (701); the top wall of the sealing gasket (705) is tightly attached to the bottom wall of the bottom plate (3); a pressing plate (706) is sleeved on the outer side of the square-shaped plate (701); the pressing plate (706) is located below the sealing gasket (705); a plurality of upper pressure sealing units (707) are mounted between the base (1) and the pressing plate (706); the upper pressure sealing units (707) are used to drive the pressing plate (706) to press the sealing gasket (705) when the ambient humidity is high; a plurality of clamping and fixing units (708) are mounted on the outer side of the base (1); the clamping and fixing units (708) are used to generate downward pressure on the bottom plate (3) when the ambient humidity is high.

2. A waterproof circuit protection device according to claim 1, characterized in that: The four corners of the square plate (701) are provided with positioning grooves (702), the four corners of the bottom end of the bottom plate (3) are provided with positioning columns (703), the positioning columns (703) are inserted into the positioning grooves (702), the four corners of the top end of the base (1) are provided with screw barrels (4), the four corners of the bottom plate (3) are provided with bolts (5), and the bolts (5) are threadedly connected to the screw barrels (4).

3. A waterproof circuit protection device according to claim 1, characterized in that: The upper pressure sealing unit (707) comprises a fixed cylinder (7071) fixedly mounted on the top of the base (1), a top groove (7072) being provided at the top of the fixed cylinder (7071), a movable plate (7076) being installed inside the fixed cylinder (7071), a top rod (7077) being installed at the top of the piston (7074), the top rod (7077) passing through the top groove (7072) and being fixedly connected to the bottom wall of the pressure plate (706), a piston (7074) being movably mounted inside the fixed cylinder (7071), the piston (7074) being located below the movable plate (7076), and a first spring (7078) being installed between the piston (7074) and the movable plate (7076).

4. A waterproof circuit protection device according to claim 3, characterized in that: The outer wall of the piston (7074) is in close contact with the inner wall of the fixed cylinder (7071); a limiting ring (7073) is fixedly installed inside the fixed cylinder (7071); the bottom wall of the piston (7074) is in contact with the top wall of the limiting ring (7073); the space below the piston (7074) inside the fixed cylinder (7071) forms an air storage chamber (7075); the interior of the air storage chamber (7075) is filled with gas that expands when heated; and a moistening and heating component is installed outside the fixed cylinder (7071).

5. A waterproof circuit protection device according to claim 4, characterized in that: The wet heating component comprises a heat-conducting ring (7079) sleeved on the outside of the U-shaped plate (701); a heat-conducting box (70710) is fixedly mounted on one side of the heat-conducting ring (7079); connecting holes (70712) are evenly arranged on the heat-conducting box (70710); a water-absorbing heat-generating bag (70711) is placed inside the heat-conducting box (70710); the internal material of the water-absorbing heat-generating bag (70711) is quicklime; a top cover (70713) is mounted on the top of the heat-conducting box (70710); and the materials of the heat-conducting ring (7079), the heat-conducting box (70710) and the U-shaped plate (701) are all heat-conducting materials.

6. A waterproof circuit protection device according to claim 1, characterized in that: The clamping fixing unit (708) comprises a vertical plate (7081) fixedly mounted on the side wall of the base (1); the vertical plate (7081) is located on a side of the fixing tube (7071) away from the square-shaped plate (701); a movable groove (7082) is provided on the vertical plate (7081); a guide rod (7083) is symmetrically mounted inside the movable groove (7082); a movable block (7084) is movably mounted inside the movable groove (7082); the movable block (7084) is slidably connected to the guide rod (7083); a second spring (7085) is symmetrically mounted at the bottom end of the movable block (7084); and the bottom end of the second spring (7085) is fixedly connected to the inner bottom wall of the movable groove (7082).

7. A waterproof circuit protection device according to claim 6, characterized in that: The movable block (7084) is provided with a plate groove (7086), and a clamping plate (7087) is movably installed inside the plate groove (7086). One end of the clamping plate (7087) is clamped into the inside of the clamping groove (704). The clamping groove (704) is provided on the side wall of the bottom plate (3). A third spring (7088) is fixedly installed on one end of the clamping plate (7087) located inside the plate groove (7086). One end of the third spring (7088) is fixedly connected to the inner wall of the plate groove (7086). A pull rod (7089) is installed on one end of the clamping plate (7087). The pull rod (7089) extends to the outside of the movable block (7084). A downward pressure sealing unit (709) is installed between the clamping plate (7087) and the piston (7074).

8. A waterproof circuit protection device according to claim 7, characterized in that: The downward pressure sealing unit (709) comprises a longitudinal groove (7095) formed on the card plate (7087), a longitudinal plate (7096) being longitudinally slidably mounted inside the longitudinal groove (7095), a top plate (7097) being fixedly mounted on the top of the longitudinal plate (7096), a fourth spring (7098) being symmetrically mounted on the bottom of the top plate (7097), the bottom end of the fourth spring (7098) being fixedly connected to the top wall of the card plate (7087), a first tooth plate (7099) being fixedly mounted on the bottom end of the longitudinal plate (7096), a gear (70911) being meshedly connected to the side of the first tooth plate (7099) away from the vertical plate (7081), and a second tooth plate (70912) being meshedly connected to the side of the gear (70911) away from the first tooth plate (7099).

9. A waterproof circuit protection device according to claim 8, characterized in that: The outer sides of the first tooth plate (7099), the outer frame (70910) and the gear (70911) are sleeved with the outer frame (70910), the gear (70911) is rotatably connected to the outer frame (70910), a transverse groove (70915) is fixedly installed on a side of the outer frame (70910) close to the vertical plate (7081), the transverse groove (70915) is slidably installed inside the transverse plate (70916), the transverse plate (70916) is opened on the vertical plate (7081), a top block (70913) is fixedly installed on the top of the second tooth plate (70912), and a slot (70914) is opened on a side of the top block (70913) away from the vertical plate (7081).

10. A waterproof circuit protection device according to claim 9, characterized in that: A rod groove (7091) is provided inside the top rod (7077), and a side groove (7092) is provided on a side of the rod groove (7091) close to the vertical plate (7081). A push rod (7093) is fixedly installed on the top end of the piston (7074), and the top end of the push rod (7093) is inserted into the rod groove (7091). An insertion rod (7094) is installed on one side of the push rod (7093), and the insertion rod (7094) is located inside the side groove (7092). When the clamping plate (7087) is clamped into the clamping groove (704), the insertion rod (7094) is inserted into the slot (70914).

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