Heat dissipation protection device for piezoresistor

Abstract

The utility model discloses a heat dissipation protection device for a piezoresistor. The heat dissipation protection device comprises a circuit board and the piezoresistor installed on the circuit board. A fixing body is installed on one side of the circuit board, a moving groove is formed in the fixing body, a heat dissipation device is arranged on one side of the fixing body, a heat conduction device is arranged in the fixing body, flow guiding devices are arranged on the two sides of the fixing body, the heat dissipation device comprises a fan box body, and the fan box body is fixedly installed on the side, away from the circuit board, of the fixing body. According to the fan box, the first motor in the fan box body drives the first rotating shaft and the fan blades to rotate to generate airflow, air enters from the air inlet and is blown out from the air outlet, the fan box body is arranged on one side of the circuit board, the airflow generated by rotation of the fan blades can accelerate air flow above the circuit board, and therefore the heat dissipation effect is achieved; the flow guide arc plate can be rotated by rotating the rotating rod, so that the blown airflow is guided by the flow guide arc plate, and the airflow can be gathered and blown to the piezoresistor.

Description

TECHNICAL FIELD

[0001] The utility model relates to a circuit heat dissipation protection technical field, concretely is a kind of heat dissipation protection device for piezoresistor. BACKGROUND

[0002] Piezoresistor is a kind of voltage-sensitive component, mainly used for overvoltage protection in circuit. It has nonlinear voltage-current characteristic, can be rapidly changed from high resistance state to low resistance state when encountering overvoltage, effectively absorbs excess current, protects circuit from damage. Piezoresistor is usually made of metal oxide material such as zinc oxide, its internal structure contains zinc oxide grains and grain boundaries, and the grain resistance is low while the grain boundary resistance is high, forming multiple zener diode barriers. These barriers will break down when the voltage exceeds a certain threshold, causing the resistance to drop sharply. This feature enables piezoresistor to withstand large current surges and protect circuits from transient high voltage. Piezoresistor has a wide range of applications in power systems, household appliances, communication equipment, computers and precision electronic equipment due to its excellent protection performance.

[0003] When overvoltage appears at both ends of piezoresistor, it will rapidly change from high resistance state to low resistance state, absorbing a large amount of surge current. Heat is generated during this process, and if the heat on the resistor cannot be dissipated in time, the service life and normal operation of the resistor will be affected, so a heat dissipation protection device for piezoresistor is needed to meet people's needs. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a kind of heat dissipation protection device for piezoresistor, to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a kind of heat dissipation protection device for piezoresistor, including circuit board and piezoresistor installed on circuit board;The fixed main body is installed on one side of the circuit board, and the fixed main body is opened on the moving groove, the fixed main body is equipped with heat dissipation device on one side, the fixed main body is equipped with heat conduction device, and the fixed main body is equipped with flow guide device on both sides;

[0006] Preferably, the heat dissipation device includes a fan box main body, the fan box main body is fixedly installed on the side of the fixed main body away from the circuit board, the first motor is fixedly installed in the fan box main body, the first motor is installed on the first rotating shaft, and the fan blade is installed on the first rotating shaft.

[0007] Preferably, the fixed main body is opened with air outlet, the fan box main body is opened with air inlet on one side, and the fan box main body is in communication with external air through air inlet and air outlet.

[0008] Preferably, the flow guide device comprises side fixing blocks fixedly installed on both sides of the fixed main body, a rotating rod rotatably installed on the side fixing blocks on the same side, and a flow guide arc plate installed on the rotating rod.

[0009] Preferably, rotating grooves are formed in the side fixing blocks on the same side, and the rotating rod and the flow guide arc plate are rotatably installed in the rotating grooves.

[0010] Preferably, the heat conduction device comprises a heat conduction long rod, one end of the heat conduction long rod is slidably installed in a moving groove, a adjusting screw is threadedly connected to one end of the heat conduction long rod installed in the moving groove, and the adjusting screw is rotatably installed in the fixed main body.

[0011] Preferably, a heat conduction patch is installed at the bottom of the end of the heat conduction long rod away from the adjusting screw, a same fixing hole is formed in the heat conduction long rod and the heat conduction patch, and a fixing screw is threadedly connected to the fixing hole.

[0012] Preferably, a first heat dissipation fin is fixedly installed on the heat conduction long rod, and a second heat dissipation fin is fixedly installed on the heat conduction patch.

[0013] Compared with the prior art, the heat dissipation protection device for the piezoresistor has the following beneficial effects:

[0014] (1) The first motor in the fan box main body drives the first rotating shaft and the fan blade to rotate to generate airflow, air enters from the air inlet and is blown out from the air outlet, the fan box main body is arranged on one side of the circuit board, the airflow generated by the rotation of the fan blade will accelerate the air flow above the circuit board, thereby achieving the effect of heat dissipation, and the rotation of the rotating rod can make the flow guide arc plate rotate, so that the blown airflow is guided by the flow guide arc plate to make it gather and blow to the piezoresistor.

[0015] (2) The heat conduction patch is attached to the upper surface of the piezoresistor, the height of the heat conduction long rod is adjusted by rotating the adjusting screw, the heat conduction long rod is attached to the heat conduction patch, the heat conduction long rod and the heat conduction patch are fixed by the fixing screw, the heat conduction patch can conduct the heat on the piezoresistor to the first heat dissipation fin and the second heat dissipation fin, thereby increasing the contact area of the piezoresistor and the air, and the heat dissipation device can better dissipate heat. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The utility model provides a kind of three-dimensional structure schematic view for the heat dissipation protection device for piezoresistor proposed by the utility model;

[0017] Figure 2 The utility model provides a kind of piezoresistor and fixed main body structure for the heat dissipation protection device for piezoresistor proposed by the utility model structure schematic view;

[0018] Figure 3The utility model provides a kind of for the structure diagram of structure such as fan blade and air outlet of heat dissipation protection device of pressure sensitive resistance.

[0019] Figure 4 The utility model provides a kind of for the structure diagram of structure such as rotary rod and flow guide arc plate of heat dissipation protection device of pressure sensitive resistance.

[0020] In the drawing: 1, circuit board;2, heat dissipation device;3, flow guide device;4, heat conduction device;5, pressure sensitive resistance;6, fixed main body;7, moving groove;20, fan box main body;21, first motor;22, first rotating shaft;23, fan blade;24, air inlet;25, air outlet;30, side fixed block;31, rotary groove;32, rotary rod;33, flow guide arc plate;40, heat conduction long rod;41, fixed hole;42, fixed bolt;43, heat conduction patch;44, first heat dissipation fin;45, second heat dissipation fin;46, adjusting bolt. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0022] Embodiment 1: please refer to Figures 1-4 The utility model provides a kind of technical scheme: a kind of heat dissipation protection device for pressure sensitive resistance, including circuit board 1 and install on circuit board 1 on pressure sensitive resistance 5;In order to be able to carry out heat dissipation to pressure sensitive resistance and prolong its service life guarantee its normal work, circuit board 1 side is equipped with fixed main body 6, and fixed main body 6 is equipped with moving groove 7, and fixed main body 6 side is equipped with heat dissipation device 2, and fixed main body 6 is equipped with heat conduction device 4, and fixed main body 6 both sides are equipped with flow guide device 3, heat conduction device 4 is carried out to resistance and increase its and air contact area, air flow is blown out by heat dissipation device 2 to accelerate air flow and carry out heat dissipation, the air flow that is blown out is gathered and guided by flow guide device 3, so that air flow can be aimed at resistance;

[0023] In order to achieve the function of heat dissipation, the heat dissipation device 2 comprises a fan box body 20 fixedly installed on the fixed body 6 away from the circuit board 1, a first motor 21 fixedly installed in the fan box body 20, a first rotating shaft 22 installed on the first motor 21, a fan blade 23 installed on the first rotating shaft 22, an air outlet 25 opened in the fixed body 6, an air inlet 24 opened on one side of the fan box body 20, and the inside of the fan box body 20 is in flow communication with the outside air through the air inlet 24 and the air outlet 25. The flow guide device 3 comprises a side fixed block 30 fixedly installed on both sides of the fixed body 6, a rotating rod 32 rotatably installed on the same side of the side fixed block 30, a flow guide arc plate 33 installed on the rotating rod 32, a rotating groove 31 opened on the same side of the side fixed block 30, and the rotating rod 32 and the flow guide arc plate 33 are rotatably installed in the rotating groove 31. The first motor 21 in the fan box body 20 drives the first rotating shaft 22 and the fan blade 23 to rotate to generate air flow, the air enters from the air inlet 24 and blows out from the air outlet 25, the fan box body 20 is arranged on one side of the circuit board, and the air flow generated by the rotation of the fan blade 23 will accelerate the air flow above the circuit board, thereby achieving the effect of heat dissipation. Rotating the rotating rod 32 can make the flow guide arc plate 33 rotate, thereby guiding the blown air flow by the flow guide arc plate 33, so that it can be gathered and blown to the pressure sensitive resistor 5.

[0024] Embodiment 2: as Figures 1-3 In order to assist heat dissipation and increase the contact area of the resistor and the air, the heat conduction device 4 comprises a heat conduction long rod 40, one end of the heat conduction long rod 40 is slidably installed in the moving groove 7, a adjusting screw 46 is threadedly connected to one end of the heat conduction long rod 40 installed in the moving groove 7, the adjusting screw 46 is rotatably installed in the fixed body 6, a heat conduction patch 43 is installed at the bottom of the end of the heat conduction long rod 40 away from the adjusting screw 46, a fixing hole 41 is opened on the heat conduction long rod 40 and the heat conduction patch 43, a fixing screw 42 is threadedly connected in the fixing hole 41, a first heat dissipation fin 44 is fixedly installed on the heat conduction long rod 40, and a second heat dissipation fin 45 is fixedly installed on the heat conduction patch 43. In use, the heat conduction patch 43 is attached to the upper surface of the pressure sensitive resistor 5, the height of the heat conduction long rod 40 is adjusted by rotating the adjusting screw 46, the lower surface of the heat conduction long rod 40 is attached to the upper surface of the heat conduction patch 43, the fixing screw 42 is screwed into the fixing hole 41 to fix the heat conduction long rod 40 and the heat conduction patch 43, and the heat conduction long rod 40, the heat conduction patch 43, the first heat dissipation fin 44 and the second heat dissipation fin 45 are all made of good heat conductive materials such as copper. The heat conduction patch 43 can conduct the heat on the pressure sensitive resistor 5 to the first heat dissipation fin 44 and the second heat dissipation fin 45, thereby increasing the contact area of the pressure sensitive resistor 5 and the air. The remaining features are the same as those of embodiment 1.

[0025] The working principle is: in use, the heat-conducting patch 43 is pasted on the upper surface of the pressure-sensitive resistor 5, and the height of the heat-conducting long rod 40 is adjusted by rotating the adjusting bolt 46, so that the lower surface of the heat-conducting long rod 40 is pasted with the upper surface of the heat-conducting patch 43, the fixing bolt 42 is screwed into the fixing hole 41 to fix the heat-conducting long rod 40 and the heat-conducting patch 43, the heat-conducting long rod 40, the heat-conducting patch 43, the first heat-dissipating fin 44 and the second heat-dissipating fin 45 are all good heat-conducting materials, such as copper, which can conduct the heat on the pressure-sensitive resistor 5 to the first heat-dissipating fin 44 and the second heat-dissipating fin 45 through the heat-conducting patch 43, so as to heat the contact area of the pressure-sensitive resistor 5 and the air, the first motor 21 in the fan box body 20 drives the first rotating shaft 22 and the fan blade 23 to rotate to generate air flow, the air enters from the air inlet 24 and blows out from the air outlet 25, the fan box body 20 is arranged on one side of the circuit board, the air flow generated by the rotation of the fan blade 23 will accelerate the air flow above the circuit board, thereby achieving the heat-dissipating effect, the rotation of the rotating rod 32 can make the flow guide arc plate 33 rotate, so as to guide the blown air flow through the flow guide arc plate 33, so that it can be gathered and blown to the pressure-sensitive resistor 5.

[0026] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A heat protection device for a pressure sensitive resistor, comprising a circuit board (1) and a pressure sensitive resistor (5) mounted on the circuit board (1); characterized in that: The circuit board (1) one side is provided with a fixed body (6), the fixed body (6) is provided with a moving slot (7), the fixed body (6) one side is provided with a heat dissipation device (2), the fixed body (6) is provided with a heat conduction device (4), the fixed body (6) both sides are provided with a flow guide device (3); The heat dissipation device (2) includes a fan box body (20), the fan box body (20) is fixedly installed on the fixed body (6) away from the circuit board (1) side, the fan box body (20) is fixedly installed with the first motor (21), the first motor (21) is installed with the first rotating shaft (22), the first rotating shaft (22) is installed with the fan blade (23).

2. A heat protection device for a piezoresistor according to claim 1, characterized in that: The fixed body (6) is provided with an air outlet (25), the fan box body (20) one side is provided with an air inlet (24), the fan box body (20) is communicated with the outside air through the air inlet (24) and the air outlet (25).

3. The heat protection device for a piezoresistor according to claim 1, wherein: The flow guide device (3) includes a side fixed block (30), the side fixed block (30) is fixedly installed on the fixed body (6) both sides, the side fixed block (30) on the same side is rotatably installed with a rotating rod (32), the rotating rod (32) is installed with a flow guide arc plate (33).

4. The heat protection device for a piezoresistor according to claim 3, wherein: The side fixed block (30) on the same side is provided with a rotating slot (31), the rotating rod (32) and the flow guide arc plate (33) are rotatably installed in the rotating slot (31).

5. The heat sink protection device for a piezoresistor according to claim 1, wherein: The heat conduction device (4) includes a heat conduction long rod (40), one end of the heat conduction long rod (40) is slidably installed in the moving slot (7), the heat conduction long rod (40) is installed in the moving slot (7) one end and is screwed with an adjusting bolt (46), the adjusting bolt (46) is rotatably installed in the fixed body (6).

6. A heat sink protection device for a piezoresistor according to claim 5, wherein: The heat conduction long rod (40) is installed with a heat conduction patch (43) on the bottom of the end away from the adjusting bolt (46), the heat conduction long rod (40) and the heat conduction patch (43) are provided with a same fixed hole (41), the fixed hole (41) is screwed with a fixed bolt (42).

7. A heat sink protection device for a piezoresistor according to claim 6, wherein: The heat conduction long rod (40) is fixedly installed with a first heat dissipation fin (44), the heat conduction patch (43) is fixedly installed with a second heat dissipation fin (45).

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