Protective shell suitable for zinc oxide annular piezoresistor

Abstract

The invention discloses a protective shell suitable for a zinc oxide annular piezoresistor, and belongs to the technical field of piezoresistor protection, the protective shell comprises a lower cover, an upper cover and a piezoresistor, the outer surface of the lower cover and the outer surface of the upper cover are fixedly provided with mounting legs, the outer surface of the piezoresistor is fixedly provided with pins, and the pins are fixedly connected with the lower cover. Heat conduction assemblies are arranged on the inner walls of the lower cover and the upper cover; according to the invention, the sub-varistor can be clamped and positioned by arranging the heat conduction assembly and the fins, so that the stability of the varistor in the protective shell is ensured, the pin damage caused by the shaking of the varistor is further reduced, the protection of the protective shell on the varistor is ensured, and meanwhile, the fins are matched with helium, so that the protection effect of the protective shell on the varistor is improved. According to the protective shell, the overall heat conduction efficiency of the protective shell is improved, high temperature generated by the piezoresistor during working can be quickly reduced, the piezoresistor is prevented from working in a high-temperature state, the heat conduction function of the protective shell is improved, and meanwhile the service life of the piezoresistor is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of protective technology of pressure sensitive resistors, and particularly relates to a protective shell suitable for a zinc oxide ring-shaped pressure sensitive resistor. BACKGROUND

[0002] A pressure sensitive resistor is a voltage-limiting element sensitive to voltage changes, which is characterized in that, at a specified temperature, when the voltage exceeds a certain threshold, the resistance will decrease sharply, and the current passing through it will increase sharply, and the voltage and current are not linearly related. Therefore, the pressure sensitive resistor is also called a nonlinear resistor. The pressure sensitive resistor is an element whose conductance value increases sharply with the increase of voltage at a certain temperature. The pressure sensitive resistor uses a semiconductor material as a resistor, and is also a variety of semiconductor resistors in terms of properties.

[0003] A multi-layer chip pressure sensitive resistor is disclosed in a Chinese patent (CN119132766B), which comprises a protective shell, a cover plate detachably mounted above the protective shell, and a resistor body installed in the protective shell. The resistor body is a multi-layer chip pressure sensitive resistor. A first sliding table is arranged below the longitudinal sides of the protective shell. A longitudinal positioning plate is arranged above the sliding table to longitudinally position the resistor body. Transverse positioning plates are arranged on the transverse sides of the protective shell to transversely position the resistor body in the protective shell. The resistor body is positioned in multiple directions by the structure of the top plate, the longitudinal positioning plate, the transverse positioning plate, and the stop block. Even if the rubber pad deforms and ages with the increase of use time, the resistor body can still be effectively positioned in the protective shell, preventing the resistor body from moving in the protective shell and affecting the normal use of the resistor body.

[0004] In order to improve the protection of the pressure sensitive resistor during use, a protective shell is used to wrap the pressure sensitive resistor. However, most of the current protective shells are covers with heat dissipation holes. The pressure sensitive resistor generates high temperature during work. The heat dissipation holes can only dissipate heat by themselves, which has low heat dissipation efficiency and is prone to heat accumulation, causing the pressure sensitive resistor to work at high temperature and reducing the sensitivity of the pressure sensitive resistor. Therefore, a protective shell suitable for a zinc oxide ring-shaped pressure sensitive resistor is provided. SUMMARY

[0005] The purpose of the present application is to solve the problem of heat accumulation in the current protective shell, low heat dissipation efficiency, and the resulting pressure sensitive resistor working at high temperature, which reduces the sensitivity of the pressure sensitive resistor. A protective shell suitable for a zinc oxide ring-shaped pressure sensitive resistor is proposed.

[0006] In order to achieve the above object, the application adopts the following technical scheme: A protective shell suitable for zinc oxide ring-shaped varistor, comprising a lower cover, an upper cover and a varistor, the outer surfaces of the lower cover and the upper cover are fixedly installed with protective sleeves, the two protective sleeves are matched with each other, the outer surfaces of the lower cover and the upper cover are fixedly installed with installation legs, the upper surfaces of the installation legs are provided with installation holes, the outer surface of the varistor is fixedly installed with a pin, the pin is matched with the protective sleeve, the inner walls of the lower cover and the upper cover are provided with heat conduction assemblies, the outer surfaces of the lower cover and the upper cover are provided with heat dissipation assemblies, the upper surface of the lower cover is provided with a splicing assembly. The heat conduction assembly comprises a positioning groove and a sealing sleeve, the outer surfaces of the lower cover and the upper cover are provided with the positioning grooves, the inner walls of the positioning grooves are fixedly installed with ring sleeves, the interiors of the ring sleeves are provided with cavities, the outer surfaces of the ring sleeves are communicated with air nozzles, the cavities of the ring sleeves are provided with helium, and the helium has good heat conduction performance.

[0007] Further description of the above technical scheme: The inner surfaces of the lower cover and the upper cover are provided with a plurality of sealing sleeves, the sealing sleeves correspond to each other, and the side walls of the sealing sleeves are communicated with connecting pipes.

[0008] Further description of the above technical scheme: One end of the connecting pipe extends into the cavity of the ring sleeve, the inner side walls of the sealing sleeves are fixedly installed with limiting springs, one end of the limiting spring is fixedly installed with a fin, and one end of the fin extends to the outside of the sealing sleeve.

[0009] Further description of the above technical scheme: The side wall of the fin is arc-shaped, the outer surface of the fin is fixedly installed with a sealing ring, and the sealing ring is attached to the inner surface of the sealing sleeve.

[0010] The fin is extruded into the interior of the sealing sleeve, then the varistor is placed into the interior of the lower cover, then the position of the varistor is adjusted, the pin is placed into the protective sleeve, the fin is moved to the outside of the sealing sleeve under the action of the limiting spring, so that the varistor is clamped and fixed, helium is injected into the cavity of the ring sleeve through the air nozzle, the helium in the cavity of the ring sleeve enters the interior of the sealing sleeve through the connecting pipe, and the fin and the inner surface of the sealing sleeve are sealed under the action of the sealing ring, the fin in contact with the varistor absorbs heat when the varistor works, and the heat is conducted to the lower cover and the upper cover through the sealing sleeve and the helium, so that the heat dissipation speed of the heat is increased.

[0011] Further description of the above technical scheme: The heat dissipation assembly comprises a sealing plate and a heat dissipation groove, the heat dissipation groove is provided with the lower surface of the lower cover and the upper surface of the upper cover, and the inner surface of the heat dissipation groove is provided with a mounting groove.

[0012] As a further description of the above technical solution: The sealing plate and the heat dissipation groove are mutually matched in size, the upper surface of the sealing plate is fixedly provided with a connecting rod, one end of the connecting rod is fixedly provided with a fixing rod, and one end of the fixing rod extends into the mounting groove.

[0013] As a further description of the above technical solution: The lower surface of the fixing rod is fixedly provided with a thermal expansion alloy, one end of the thermal expansion alloy is fixedly connected with the inner wall of the bottom surface of the mounting groove, and the thermal expansion alloy expands after being heated.

[0014] The thermal expansion alloy can absorb heat, and after the thermal expansion alloy reaches a certain temperature, it will expand under the limitation of the mounting groove, thereby driving the fixing rod to move in the mounting groove, and then driving the sealing plate to move outward of the lower cover and the upper cover through the connecting rod. When the sealing plate moves to the outside of the heat dissipation groove, a gap is formed, and at this time the heat can be dissipated through the gap.

[0015] As a further description of the above technical solution: The splicing assembly comprises an insertion rod, one end of the insertion rod is fixedly connected with the upper surface of the lower cover, the other end of the insertion rod is provided with a groove, and a positioning spring is fixedly installed on the inner side wall of the groove.

[0016] As a further description of the above technical solution: One end of the positioning spring is fixedly provided with a clamping block, one side of the clamping block is provided as an inclined surface, part of the clamping block extends to the outside of the groove, the lower surface of the upper cover is provided with a clamping groove, a limiting groove is arranged on the side wall of the clamping groove, the clamping groove and the insertion rod are mutually matched, and the limiting groove and the clamping block are mutually matched.

[0017] The upper cover and the lower cover are combined, the needle feet are wrapped by the protective sleeve on the upper cover and the protective sleeve on the lower cover, when the upper cover and the lower cover are combined, the insertion rod on the lower cover is inserted into the clamping groove, because one side of the clamping block is provided as an inclined surface, therefore, during the process of inserting the insertion rod into the clamping groove, the clamping block will first shrink into the groove, at this time the positioning spring is in a compressed state, after the insertion rod is completely inserted into the clamping groove, the clamping block loses the shielding of the clamping groove, and under the action of the positioning spring, the clamping block will pop out of the groove, and then the clamping block is fixed by the limiting groove, so as to fix the insertion rod and the clamping groove, thereby combining the lower cover and the upper cover, when it is necessary to separate the lower cover and the upper cover, the clamping block is extruded into the groove by using a matched tool, so that the clamping block and the limiting groove are separated, then the insertion rod is pulled out of the clamping groove, thereby separating the lower cover and the upper cover, and then the pressure-sensitive resistor is repaired or replaced.

[0018] As a further description of the above technical solutions: The protection assembly comprises a protective sleeve, the outer surfaces of the lower cover and the upper cover are both communicated with the protective sleeve, the protective sleeves on the lower cover and the upper cover are mutually matched, the inner surface of the protective sleeve is slidably provided with a movable sleeve, the outer surface of the movable sleeve is provided with a positioning hole, the outer surface of the protective sleeve is fixedly provided with a connecting spring, one end of the connecting spring is fixedly provided with a fixed disc, the lower surface of the fixed disc is fixedly provided with a positioning pin, one end of the positioning pin penetrates the inside of the connecting spring and extends into the inside of the protective sleeve, one end of the positioning pin is matched with the positioning hole, and the protective sleeve and the movable sleeve are matched with the needle pin.

[0019] According to the length required by the needle pin, the fixed disc can drive the positioning pin to be separated from the positioning hole, at this time, the movable sleeve loses the limiting of the positioning pin, and then the movable sleeve is moved to the outside of the protective sleeve, until the movable sleeve is moved to the appropriate position, and then the fixed disc drives the positioning pin to be inserted into the positioning hole of the movable sleeve under the action of the connecting spring, so as to fix the movable sleeve, and then the protective sleeve and the movable sleeve wrap the needle pin, thereby protecting the needle pin.

[0020] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present application are: 1、In the present application, the heat conduction assembly is provided, the fins are pressed into the inside of the sealing sleeve, then the pressure sensitive resistor is placed into the inside of the lower cover, then the position of the pressure sensitive resistor is adjusted, the needle pin is placed into the protective sleeve, the fins are moved to the outside of the sealing sleeve under the action of the limiting spring, so as to clamp and fix the pressure sensitive resistor, the helium gas is injected into the cavity of the ring sleeve through the air nozzle, the helium gas in the cavity of the ring sleeve enters the inside of the sealing sleeve through the connecting pipe, the fins and the inner surface of the sealing sleeve are sealed under the action of the sealing ring, the fins in contact with the pressure sensitive resistor can absorb heat when the pressure sensitive resistor works, the heat is conducted to the lower cover and the upper cover through the sealing sleeve and the helium gas, the heat dissipation speed is increased, the pressure sensitive resistor is clamped and positioned by the fins, the stability of the pressure sensitive resistor in the protective shell is ensured, the damage of the needle pin caused by the shaking of the pressure sensitive resistor is reduced, the protection of the protective shell to the pressure sensitive resistor is ensured, the overall heat conduction efficiency of the protective shell is improved by the cooperation of the fins and the helium gas, the high temperature generated by the working of the pressure sensitive resistor can be quickly removed, the working of the pressure sensitive resistor in the high temperature state is avoided, the heat conduction function of the protective shell is improved, and the service life of the pressure sensitive resistor is also improved.

[0021] In the application, the thermal expansion alloy absorbs heat, and expands under the limit of the installation groove when the thermal expansion alloy reaches a certain temperature, thereby driving the fixed rod to move in the installation groove, and then driving the sealing plate to move outside the upper cover and the lower cover through the connecting rod, and a gap is generated when the sealing plate moves outside the heat dissipation groove, at which time the heat can be dissipated through the gap, and the heat expansion principle of the thermal expansion alloy is utilized to make the thermal expansion alloy expand in one direction under the limit of the installation groove, so that the sealing plate loses the block of the heat dissipation groove, and then part of the heat in the protective shell can be discharged through the heat dissipation groove, which cooperates with the heat conduction component to effectively reduce the temperature of the protective shell, so that the piezoresistor works at room temperature, and the sensitivity of the piezoresistor during work is ensured.

[0022] In the application, the splicing assembly and the protection assembly are provided, the positioning pin is driven out of the positioning hole in the fixed disc according to the length of the needle, and then the movable sleeve is moved outside the protection sleeve after losing the limit of the positioning pin, and then the fixed disc drives the positioning pin to insert into the positioning hole of the movable sleeve under the action of the connecting spring, so that the movable sleeve is fixed, and then the protection sleeve and the movable sleeve wrap the needle, thereby protecting the needle, the upper cover and the lower cover are combined, the needle is wrapped by the protection sleeve on the upper cover and the protection sleeve on the lower cover, the insertion rod on the lower cover is inserted into the clamping groove when the upper cover and the lower cover are combined, and since one side of the clamping block is provided as an inclined surface, the clamping block will first shrink into the groove during the insertion of the insertion rod into the clamping groove, at which time the positioning spring is in a compressed state, and after the insertion rod is completely inserted into the clamping groove, the clamping block loses the block of the clamping groove and is popped out of the groove under the action of the positioning spring, and then the clamping block is fixed in the limiting groove, so that the insertion rod and the clamping groove are fixed, and then the lower cover and the upper cover are combined, when the lower cover and the upper cover need to be separated, the clamping block is extruded into the groove by using a matched tool, so that the clamping block and the limiting groove are separated, and then the insertion rod is pulled out of the clamping groove, thereby separating the lower cover and the upper cover, and then the piezoresistor is repaired or replaced, the splicing function of the protective shell is realized by the insertion rod, the clamping block and the clamping groove, the assembly difficulty of the protective shell is reduced, the protective shell is quickly installed and disassembled, the protection of the piezoresistor is realized, the use time of the piezoresistor is improved, the protection assembly can adjust according to the length of the needle, the protection sleeve and the movable sleeve can comprehensively wrap the exposed needle, the protection of the needle of the piezoresistor is improved, the protectiveness of the protective shell to the needle is improved, and the damage of the needle is reduced, thereby improving the working stability of the piezoresistor. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a three-dimensional structure diagram of a protective shell suitable for a zinc oxide ring-shaped piezoresistor.

[0024] Figure 2 It is an exploded view of a protective shell for a zinc oxide ring-shaped varistor.

[0025] Figure 3 It is a perspective view of a lower cover of a protective shell for a zinc oxide ring-shaped varistor.

[0026] Figure 4 It is a sectional view of a lower cover of a protective shell for a zinc oxide ring-shaped varistor.

[0027] Figure 5 It is an enlarged view of A in a protective shell for a zinc oxide ring-shaped varistor. Figure 4

[0028] Figure 6 It is an exploded view of a lower cover of a protective shell for a zinc oxide ring-shaped varistor.

[0029] Figure 7 It is an enlarged view of B in a protective shell for a zinc oxide ring-shaped varistor. Figure 6

[0030] Figure 8 It is a perspective view of a protective assembly in a protective shell for a zinc oxide ring-shaped varistor.

[0031] Legend: 1, lower cover; 2, upper cover; 3, protective assembly; 31, protective sleeve; 32, movable sleeve; 33, positioning hole; 34, connecting spring; 35, fixed disc; 36, positioning pin; 4, mounting leg; 5, heat dissipation assembly; 51, sealing plate; 52, heat dissipation groove; 53, mounting groove; 54, connecting rod; 55, fixed rod; 56, thermal expansion alloy; 6, heat conduction assembly; 61, ring sleeve; 62, air nozzle; 63, sealing sleeve; 64, positioning groove; 65, connecting pipe; 66, fin; 67, limiting spring; 7, splicing assembly; 71, insertion rod; 72, groove; 73, positioning spring; 74, clamping block; 8, varistor; 9, pin; 10, clamping groove. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] Please refer to Figures 1-8 ​​The application provides a technical scheme: a protective shell suitable for a zinc oxide ring-shaped voltage-dependent resistor, which comprises a lower cover 1, an upper cover 2 and a voltage-dependent resistor 8, mounting legs 4 are fixedly installed on the outer surfaces of the lower cover 1 and the upper cover 2, mounting holes are arranged on the upper surfaces of the mounting legs 4, pin feet 9 are fixedly installed on the outer surface of the voltage-dependent resistor 8, heat-conducting components 6 are arranged on the inner walls of the lower cover 1 and the upper cover 2, heat-dissipating components 5 are arranged on the outer surfaces of the lower cover 1 and the upper cover 2, splicing components 7 are arranged on the upper surface of the lower cover 1, and protective components 3 are arranged on the outer surfaces of the lower cover 1 and the upper cover 2. The heat-conducting component 6 comprises positioning grooves 64 and sealing sleeves 63, the outer surfaces of the lower cover 1 and the upper cover 2 are provided with the positioning grooves 64, ring sleeves 61 are fixedly installed on the inner walls of the positioning grooves 64, cavities are arranged in the ring sleeves 61, air nozzles 62 are in communication with the outer surfaces of the ring sleeves 61, helium is arranged in the cavities of the ring sleeves 61, the helium has good heat-conducting performance, a plurality of the sealing sleeves 63 are arranged on the inner surfaces of the lower cover 1 and the upper cover 2, the sealing sleeves 63 correspond to each other, connecting pipes 65 are in communication with the side walls of the sealing sleeves 63, one end of the connecting pipe 65 extends into the cavity of the ring sleeve 61, limiting springs 67 are fixedly installed on the inner side walls of the sealing sleeves 63, one end of the limiting spring 67 is fixedly installed with a fin 66, one end of the fin 66 extends to the outside of the sealing sleeve 63, the side wall of the fin 66 is in an arc shape, and a sealing ring is fixedly installed on the outer surface of the fin 66 and is attached to the inner surface of the sealing sleeve 63.

[0034] Specific embodiments are as follows: the fin 66 is extruded into the inside of the sealing sleeve 63, then the voltage-dependent resistor 8 is placed into the inside of the lower cover 1, then the position of the voltage-dependent resistor 8 is adjusted so that the pin feet 9 are placed into the protective sleeve 31, the fin 66 is moved to the outside of the sealing sleeve 63 under the action of the limiting spring 67, so that the voltage-dependent resistor 8 is clamped and fixed, the helium is injected into the cavity of the ring sleeve 61 through the air nozzle 62, the helium in the cavity of the ring sleeve 61 enters the inside of the sealing sleeve 63 through the connecting pipe 65, the fin 66 and the inner surface of the sealing sleeve 63 are sealed under the action of the sealing ring, the voltage-dependent resistor 8 generates heat when working, at this time, the fin 66 in contact with the voltage-dependent resistor 8 absorbs the heat, and the heat is conducted to the lower cover 1 and the upper cover 2 through the sealing sleeve 63 and the helium, so that the heat dissipation speed is increased.

[0035] The heat dissipation assembly 5 comprises a sealing plate 51 and a heat dissipation groove 52, the heat dissipation groove 52 is provided with the lower surface of the lower cover 1 and the upper surface of the upper cover 2, the inner surface of the heat dissipation groove 52 is provided with a mounting groove 53, the sealing plate 51 and the heat dissipation groove 52 are mutually matched in size, the upper surface of the sealing plate 51 is fixedly installed with a connecting rod 54, one end of the connecting rod 54 is fixedly installed with a fixed rod 55, one end of the fixed rod 55 extends into the mounting groove 53, the lower surface of the fixed rod 55 is fixedly installed with a thermal expansion alloy 56, one end of the thermal expansion alloy 56 is fixedly connected with the bottom inner wall of the mounting groove 53, the thermal expansion alloy 56 expands after being heated.

[0036] Specific embodiments are that the thermal expansion alloy 56 absorbs heat, and after the thermal expansion alloy 56 reaches a certain temperature, it expands under the limitation of the mounting groove 53, thereby driving the fixed rod 55 to move in the mounting groove 53, and then driving the sealing plate 51 to move outward of the lower cover 1 and the upper cover 2 through the connecting rod 54, and when the sealing plate 51 moves to the outside of the heat dissipation groove 52, a gap is generated, at this time, heat can be dissipated through the gap.

[0037] The splicing assembly 7 comprises an insertion rod 71, one end of the insertion rod 71 is fixedly connected with the upper surface of the lower cover 1, the other end of the insertion rod 71 is provided with a groove 72, the inner side wall of the groove 72 is fixedly installed with a positioning spring 73, one end of the positioning spring 73 is fixedly installed with a clamping block 74, one side of the clamping block 74 is provided as an inclined surface, part of the clamping block 74 extends to the outside of the groove 72, the lower surface of the upper cover 2 is provided with a clamping groove 10, the side wall of the clamping groove 10 is provided with a limiting groove, the clamping groove 10 and the insertion rod 71 are mutually matched, and the limiting groove and the clamping block 74 are mutually matched.

[0038] Specific embodiments are that the upper cover 2 and the lower cover 1 are combined, the pin 9 is wrapped by the protective sleeve 31 on the upper cover 2 and the protective sleeve 31 on the lower cover 1, when the upper cover 2 and the lower cover 1 are combined, the insertion rod 71 on the lower cover 1 is inserted into the clamping groove 10, because one side of the clamping block 74 is provided as an inclined surface, therefore, in the process of inserting the insertion rod 71 into the clamping groove 10, the clamping block 74 will first shrink into the groove 72, at this time, the positioning spring 73 is in a compressed state, after the insertion rod 71 is completely inserted into the clamping groove 10, the clamping block 74 loses the shielding of the clamping groove 10, and under the action of the positioning spring 73, the clamping block 74 will pop out of the groove 72, and then the clamping block 74 is fixed under the action of the limiting groove, thereby fixing the insertion rod 71 and the clamping groove 10, and then combining the lower cover 1 and the upper cover 2, when it is needed to separate the lower cover 1 and the upper cover 2, the clamping block 74 is extruded into the groove 72 by using a matched tool, so that the clamping block 74 and the limiting groove are separated, then the insertion rod 71 is pulled out of the clamping groove 10, thereby separating the lower cover 1 and the upper cover 2, and then overhauling or replacing the piezoresistor.

[0039] The protection assembly 3 comprises a protection sleeve 31, the outer surfaces of the lower cover 1 and the upper cover 2 are communicated and mounted with the protection sleeve 31, the protection sleeves 31 on the lower cover 1 and the upper cover 2 are mutually matched, the inner surface of the protection sleeve 31 is slidingly mounted with a movable sleeve 32, the outer surface of the movable sleeve 32 is provided with a positioning hole 33, the outer surface of the protection sleeve 31 is fixedly mounted with a connecting spring 34, one end of the connecting spring 34 is fixedly mounted with a fixed disc 35, the lower surface of the fixed disc 35 is fixedly mounted with a positioning pin 36, one end of the positioning pin 36 penetrates the inside of the connecting spring 34 and extends to the inside of the protection sleeve 31, one end of the positioning pin 36 is matched with the positioning hole 33, the protection sleeve 31 and the movable sleeve 32 are matched with the needle foot 9.

[0040] Specific embodiments are: according to the length required by the needle foot 9, the fixed disc 35 can drive the positioning pin 36 to separate from the positioning hole 33 first, at this time the movable sleeve 32 loses the limiting of the positioning pin 36, then the movable sleeve 32 is moved to the outside of the protection sleeve 31, after the movable sleeve 32 is moved to the appropriate position, the fixed disc 35 drives the positioning pin 36 to insert into the positioning hole 33 of the movable sleeve 32 under the action of the connecting spring 34, so as to fix the movable sleeve 32, and then the protection sleeve 31 and the movable sleeve 32 wrap the needle foot 9, so as to protect the needle foot 9.

[0041] Working principle: the fin 66 to the inside of the sealing sleeve 63 extrusion, and then put the pressure sensitive resistor 8 into the lower cover 1 inside, and then adjust the position of the pressure sensitive resistor 8, so that the pin 9 into the protective sleeve 31, according to the length of the pin 9 needs, can first through the fixed disc 35 drive positioning pin 36 from the positioning hole 33, at this time the movable sleeve 32 lose the positioning pin 36 limit, the movable sleeve 32 to the outside of the protective sleeve 31 movement, until the movable sleeve 32 to the appropriate position, then in the connecting spring 34 under the action of the fixed disc 35 drive positioning pin 36 into the movable sleeve 32 positioning hole 33, so as to fix the movable sleeve 32, and then make the protective sleeve 31 and movable sleeve 32 will pin 9 wrapped, so as to protect the pin 9, the fin 66 in the limiting spring 67 under the action of the fin 66 to the outside of the sealing sleeve 63 movement, so as to clamp the pressure sensitive resistor 8, and then the upper cover 2 and lower cover 1 combined, through the upper cover 2 on the protective sleeve 31 and lower cover 1 on the protective sleeve 31 to pin 9 wrapped, the upper cover 2 and lower cover 1 combined, the lower cover 1 on the plug 71 will be inserted into the card slot 10, because one side of the block 74 is set as an inclined surface, so the plug 71 in the process of inserting into the card slot 10, the block 74 will first shrink into the recess 72, at this time the positioning spring 73 is in compression, until the plug 71 is completely inserted into the card slot 10 inside, the block 74 lose the block of the card slot 10 after the shielding, under the action of the positioning spring 73, the block 74 will pop out of the recess 72, and then in the limiting groove under the action of the block 74 is fixed, so as to fix the plug 71 and card slot 10, and then make the lower cover 1 and upper cover 2 combined, when you need to split the lower cover 1 and upper cover 2, use the matching tool to extrude the block 74 into the recess 72, so that the block 74 and limiting groove lose separation, and then the plug 71 is pulled out of the card slot 10, and then split the lower cover 1 and upper cover 2, and then repair or replace the pressure sensitive resistor 8, the pressure sensitive resistor 8 wrapped, through the air nozzle 62 into the cavity of the ring sleeve 61 helium, the helium in the cavity of the ring sleeve 61 through the connecting pipe 65 into the inside of the sealing sleeve 63, under the action of the sealing ring, the fin 66 and the inner surface of the sealing sleeve 63 are sealed, the pressure sensitive resistor 8 will produce heat when working, at this time the fin 66 in contact with the pressure sensitive resistor 8 will absorb heat, through the sealing sleeve 63 and helium to heat to the lower cover 1 and upper cover 2, increase the heat dissipation rate, at the same time, the heat expansion alloy 56 will absorb heat, until the heat expansion alloy 56 reaches a certain temperature, will be limited in the installation groove 53 expansion, so as to drive the fixed rod 55 in the installation groove 53 movement, and then through the connecting rod 54 drive sealing plate 51 to the outside of the lower cover 1 and upper cover 2 movement, until the sealing plate 51 moves to the outside of the heat dissipation groove 52 will produce gap, at this time the heat can be dissipated through the gap.

[0042] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A protective shell suitable for a zinc oxide ring varistor, comprising a lower cover (1), an upper cover (2) and a varistor (8), characterized in that: The outer surfaces of the lower cover (1) and the upper cover (2) are both fixedly mounted with mounting legs (4), the upper surfaces of the mounting legs (4) are provided with mounting holes, the outer surfaces of the varistor (8) are fixedly mounted with pins (9), the inner walls of the lower cover (1) and the upper cover (2) are both provided with heat conducting components (6), the outer surfaces of the lower cover (1) and the upper cover (2) are provided with heat dissipation components (5), the upper surface of the lower cover (1) is provided with a splicing component (7), and the outer surfaces of the lower cover (1) and the upper cover (2) are provided with a protective component (3); The heat-conducting component (6) includes a positioning groove (64) and a sealing sleeve (63). The outer surfaces of the lower cover (1) and the upper cover (2) are both provided with a positioning groove (64). A ring sleeve (61) is fixedly installed on the inner wall of the positioning groove (64). A chamber is provided inside the ring sleeve (61). The outer surface of the ring sleeve (61) is connected to and provided with a gas nozzle (62). Helium is provided in the chamber of the ring sleeve (61), and the helium has good thermal conductivity.

2. The protective shell for zinc oxide ring varistor according to claim 1, characterized in that: A plurality of sealing sleeves (63) are provided on the inner surfaces of the lower cover (1) and the upper cover (2), the sealing sleeves (63) corresponding to each other, and connecting pipes (65) are installed on the side walls of the sealing sleeves (63) in communication.

3. The protective shell suitable for zinc oxide ring varistor according to claim 2, characterized in that: One end of the connecting pipe (65) extends into the chamber of the annular sleeve (61), a limit spring (67) is fixedly mounted on the inner wall of the sealing sleeve (63), one end of the limit spring (67) is fixedly mounted with a fin (66), and one end of the fin (66) extends to the outside of the sealing sleeve (63).

4. The protective shell for zinc oxide ring varistor according to claim 3, characterized in that: The side wall of the fin (66) is configured to be arc-shaped, and a sealing ring is fixedly mounted on the outer surface of the fin (66), and the sealing ring is in contact with the inner surface of the sealing sleeve (63).

5. The protective shell suitable for zinc oxide ring varistor according to claim 4, characterized in that: The heat dissipation assembly (5) comprises a sealing plate (51) and a heat dissipation groove (52); the heat dissipation groove (52) is provided with a lower surface of a lower cover (1) and an upper surface of an upper cover (2); and the inner surface of the heat dissipation groove (52) is provided with a mounting groove (53).

6. The protective shell suitable for zinc oxide ring varistor according to claim 5, characterized in that: The sealing plate (51) and the heat dissipation groove (52) are adapted to each other in size. A connecting rod (54) is fixedly mounted on the upper surface of the sealing plate (51). A fixing rod (55) is fixedly mounted on one end of the connecting rod (54). One end of the fixing rod (55) extends into the mounting groove (53).

7. The protective shell for zinc oxide ring varistor according to claim 6, characterized in that: A thermal expansion alloy (56) is fixedly mounted on the lower surface of the fixing rod (55), one end of the thermal expansion alloy (56) is fixedly connected to the inner wall of the bottom surface of the mounting groove (53), and the thermal expansion alloy (56) expands when heated.

8. The protective shell suitable for zinc oxide ring varistor according to claim 7, characterized in that: The splicing assembly (7) comprises an insert rod (71), one end of the insert rod (71) is fixedly connected to the upper surface of the lower cover (1), the other end of the insert rod (71) is provided with a groove (72), and a positioning spring (73) is fixedly installed on the inner side wall of the groove (72).

9. The protective shell for zinc oxide ring varistor according to claim 8, characterized in that: A clamping block (74) is fixedly mounted on one end of the positioning spring (73), one side of the clamping block (74) is set as an inclined surface, and a portion of the clamping block (74) extends to the outside of the groove (72). A clamping slot (10) is provided on the lower surface of the upper cover (2), and a limiting slot is provided on the side wall of the clamping slot (10). The clamping slot (10) and the insertion rod (71) are adapted to each other, and the limiting slot and the clamping block (74) are adapted to each other.

10. The protective shell suitable for zinc oxide ring varistor according to claim 9, characterized in that: The protective assembly (3) includes a protective sleeve (31), the outer surfaces of the lower cover (1) and the upper cover (2) are both connected and installed with the protective sleeve (31), the protective sleeves (31) on the lower cover (1) and the upper cover (2) are adapted to each other, the inner surface of the protective sleeve (31) is slidably installed with a movable sleeve (32), the outer surface of the movable sleeve (32) is provided with a positioning hole (33), the outer surface of the protective sleeve (31) is fixedly installed with a connecting spring (34), one end of the connecting spring (34) is fixedly installed with a fixing plate (35), the lower surface of the fixing plate (35) is fixedly installed with a positioning pin (36), one end of the positioning pin (36) passes through the interior of the connecting spring (34) and extends to the interior of the protective sleeve (31), one end of the positioning pin (36) is adapted to the positioning hole (33), and the protective sleeve (31) and the movable sleeve (32) are adapted to the pin (9).

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