Surface-mounted piezoresistor

Abstract

The utility model relates to the technical field of piezoresistors, and discloses a surface-mounted piezoresistor which comprises a resistor disc, the outer wall of the resistor disc is fixedly connected with a plastic shell, a silica gel layer is arranged in the plastic shell, the resistor disc is attached to the silica gel layer, a first pin is arranged in the resistor disc, and a second pin is arranged in the first pin. A first pin is arranged in the resistor disc, a second pin is arranged in the resistor disc, the first pin and the second pin are arranged in the plastic shell in a penetrating mode, a heat dissipation assembly is arranged on the outer wall of the plastic shell, and a protection assembly is arranged in the plastic shell; the heat dissipation assembly comprises a heat conduction silica gel pad. In the utility model, the plastic shell and the silica gel layer are arranged outside the resistor disc, and the heat-conducting silica gel pad and the radiating fins are arranged on the outer wall of the plastic shell, so that the effects of high-efficiency heat dissipation and omnibearing protection are realized, and the problems that the radiating efficiency is low, the working temperature of the resistor cannot be effectively reduced and the service life of the resistor cannot be effectively prolonged in a high-temperature and high-power environment are solved. And the long-term stability and reliability are influenced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pressure sensitive resistance especially relates to a surface mount type pressure sensitive resistance. BACKGROUND

[0002] With the increasing popularity and complication of electronic products, the application of overvoltage protection technology in circuits becomes more and more important. As a common voltage protection element, pressure sensitive resistance is widely used in power supply circuits, communication equipment and various electronic products. In order to meet the increasingly strict performance requirements, especially the stability and reliability in high power and high frequency environment, the design of pressure sensitive resistance gradually develops towards surface mount type. Surface mount type pressure sensitive resistance has become a mainstream choice due to its small size, convenient installation and suitability for automation production.

[0003] Traditional pressure sensitive resistance products are usually surface mount type structures. In these structures, the pressure sensitive resistance itself is usually composed of pressure sensitive ceramic material and electrodes. Its working principle is that when the voltage exceeds the predetermined threshold, the pressure sensitive resistance will rapidly change its resistance value, absorb and limit the excessive voltage, thereby protecting the circuit from overvoltage damage.

[0004] However, traditional pressure sensitive resistance is usually designed in a closed manner, which still has some deficiencies in heat dissipation and stability, especially in high temperature and high power environment. Its heat dissipation efficiency is low, which cannot effectively reduce the working temperature of the resistance, affecting its long-term stability and reliability. In addition, the pins of the pressure sensitive resistance are also prone to external force during transportation and installation, causing the pins to bend or break, thereby affecting the stability of the electrical connection. Therefore, a surface mount type pressure sensitive resistance is proposed to solve the above problems. UTILITY MODEL CONTENTS

[0005] In order to make up for the above deficiencies, the utility model provides a surface mount type pressure sensitive resistance, which aims to improve the problem that in the prior art, in high temperature and high power environment, the heat dissipation efficiency is low, which cannot effectively reduce the working temperature of the resistance, affecting its long-term stability and reliability.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A surface mount type pressure sensitive resistance, comprising a resistance sheet, a plastic shell fixedly connected to the outer wall of the resistance sheet, a silica gel layer provided inside the plastic shell, the resistance sheet being in close contact with the silica gel layer, a pin one provided inside the resistance sheet, a pin two provided inside the resistance sheet, the pin one and the pin two being provided inside the plastic shell, a heat dissipation assembly provided on the outer wall of the plastic shell, and a protection assembly provided inside the plastic shell.

[0008] The heat dissipation assembly comprises a heat-conducting silica gel pad, one end of the heat-conducting silica gel pad is fixedly connected to one side of the outer wall of the plastic shell, and a plurality of heat dissipation fins are fixedly connected to the other side of the outer wall of the plastic shell, and the heat dissipation fins are internally formed with a plurality of channels for heat airflow communication.

[0009] As a further description of the above technical solution:

[0010] The protection assembly comprises a protection sleeve one and a protection sleeve two, the outer wall of the protection sleeve one is fixedly connected to the inside of the plastic shell, and the outer wall of the protection sleeve two is fixedly connected to the inside of the plastic shell.

[0011] As a further description of the above technical solution:

[0012] The pin one and the pin two are respectively arranged in the inside of the protection sleeve one and the protection sleeve two.

[0013] As a further description of the above technical solution:

[0014] The outer wall of the pin two is slidably connected with a sleeve ring one, and the outer wall of the pin one is slidably connected with a sleeve ring two.

[0015] As a further description of the above technical solution:

[0016] The sleeve ring one and the sleeve ring two are fixedly connected with a supporting column, and the sleeve ring one and the sleeve ring two are connected through the supporting column.

[0017] As a further description of the above technical solution:

[0018] The sleeve ring one and the sleeve ring two are made of polycarbonate material and have good dimensional stability.

[0019] As a further description of the above technical solution:

[0020] The other end of the heat-conducting silica gel pad is fixedly connected with an anti-skid strip, the anti-skid strip is made of rubber material and has good elasticity and flexibility.

[0021] The utility model has the advantages of the following:

[0022] 1、The utility model discloses a plastic shell and a silica gel layer are arranged outside the resistance sheet, and a heat-conducting silica gel pad and a heat dissipation fin are arranged on the outer wall of the plastic shell, efficient heat dissipation and all-round protection effects are realized, the problem that the heat dissipation efficiency is low under high temperature and high power environment, the working temperature of the resistance cannot be effectively reduced, and the long-term stability and reliability are influenced is solved, and the service life of the piezoresistor is improved.

[0023] 2. The utility model discloses a protective sleeve and a sleeve ring and support column structure are arranged at the connecting place of the pin and the resistance sheet, realize the effective protection and stable fixed effect of pin, solve the problem that pin is easy to loosen and damage in the installation and use process, thereby improve the installation reliability and use stability of surface mount type piezoresistor. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 A three-dimensional schematic view of a surface mount type piezoresistor is provided for the utility model;

[0025] Fig. 2 A plastic shell cross-section structure schematic view of a surface mount type piezoresistor is provided for the utility model;

[0026] Fig. 3 A heat sink structure schematic view of a surface mount type piezoresistor is provided for the utility model.

[0027] LEGEND:

[0028] 1, plastic shell, 2, resistance sheet, 3, pin one, 4, pin two, 5, heat-conducting silica gel pad, 6, silica gel layer, 7, heat sink, 8, protective sleeve one, 9, protective sleeve two, 10, anti-skid strip, 11, sleeve ring one, 12, sleeve ring two, 13, support column. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than 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 protection of the utility model.

[0030] REFERENCE Figs. 1-3 An embodiment provided by the utility model: a surface mount type piezoresistor, comprising resistance sheet 2, resistance sheet 2 is the core part of piezoresistor, is made of high-performance piezoresistive material, has higher piezoelectric characteristic and stable resistance value, resistance sheet 2 outer wall is fixedly connected with plastic shell 1, and the main function is to protect resistance sheet 2 and internal components from external environment damage, and the inside of plastic shell 1 is provided with silica gel layer 6, and resistance sheet 2 is attached with silica gel layer 6, mainly acts as being in close contact with resistance sheet 2 and provides additional heat conduction path, resistance sheet 2 is internally provided with pin one 3, resistance sheet 2 is internally provided with pin two 4, pin one 3 and pin two 4 are all arranged in the inside of plastic shell 1, are connected to the two electrode end points of resistance sheet 2 respectively, ensure that the current can stably pass through resistance sheet 2, and the outer wall of plastic shell 1 is provided with heat dissipation component, and the inside of plastic shell 1 is provided with protection component.

[0031] The heat dissipation assembly comprises a heat-conductive silica gel pad 5 fixedly connected to one side of the outer wall of the plastic shell 1. The heat-conductive silica gel pad 5 effectively conducts the heat generated inside the pressure-sensitive resistor to the external heat dissipation system. The material of the heat-conductive silica gel pad 5 is silica gel with high heat conductivity, which has high thermal conductivity. The other side of the outer wall of the plastic shell 1 is fixedly connected with a heat sink 7. The heat sink 7 forms multiple channels inside for heat airflow to pass through, which diffuses the heat to a larger surface to accelerate the heat dissipation process. These channels can effectively enhance the flowability of the heat airflow and promote the dissipation of heat. The other end of the heat-conductive silica gel pad 5 is fixedly connected with an anti-skid strip 10 made of rubber, which has good elasticity and flexibility and can effectively reduce the sliding friction between the pressure-sensitive resistor and the surface.

[0032] Specifically, during the use of the pressure-sensitive resistor, the heat-conductive silica gel pad 5 rapidly conducts the heat generated by the resistor sheet 2 during work to the plastic shell 1. The plastic shell 1 is equipped with the heat sink 7 on its outer wall. The channels inside the heat sink 7 increase the heat dissipation surface area, thereby improving the heat dissipation efficiency and effectively reducing the working temperature of the pressure-sensitive resistor, which helps to improve its reliability and stability during long-term use and ensures that the equipment is not prone to overheating failure in a high-load working environment. In addition, the structure of the heat sink 7 can effectively prevent damage to circuit components caused by overheating. The plastic shell 1 not only has good heat dissipation performance but also has certain mechanical strength, which can provide effective physical protection for the internal resistor sheet 2. At the same time, the shell is provided with a silica gel layer 6 inside, which plays the role of insulation and buffering and avoids damage to the resistor sheet 2 caused by external voltage or vibration. The flexibility and heat conductivity of the silica gel layer 6 combine to isolate the current while better dispersing heat to the shell, further improving the overall performance. During equipment installation, the anti-skid strip 10 can increase the friction between the pressure-sensitive resistor and the installation surface, effectively preventing accidental sliding of the pressure-sensitive resistor and ensuring the stability of the equipment during use. This not only improves the safety during installation but also avoids loosening of components caused by vibration or external force, thereby improving the overall reliability of the equipment.

[0033] Reference Figs. 1-3The protection assembly comprises a protection sleeve one 8 and a protection sleeve two 9. The outer wall of the protection sleeve one 8 is fixedly connected inside the plastic shell 1, and the outer wall of the protection sleeve two 9 is fixedly connected inside the plastic shell 1, which plays a further structural reinforcement role. The pin one 3 and the pin two 4 are respectively arranged inside the protection sleeve one 8 and the protection sleeve two 9, which ensures the stability of the electrical connection. The outer wall of the pin two 4 is slidably connected with a sleeve ring one 11, and the outer wall of the pin one 3 is slidably connected with a sleeve ring two 12. The sleeve ring one 11 and the sleeve ring two 12 are fixedly connected with a support column 13. The sleeve ring one 11 and the sleeve ring two 12 are connected through the support column 13, so that the relative position between the two sleeve rings is maintained. The sleeve ring one 11 and the sleeve ring two 12 are both made of polycarbonate material, which has good dimensional stability and can withstand high temperature and large mechanical stress, ensuring the stability of the assembly during long-term use.

[0034] Specifically, the protection sleeve one 8 and the protection sleeve two 9 are designed to protect the pin one 3 and the pin two 4, so that the connection between them and the resistance sheet 2 is effectively supported. The protection sleeve one 8 and the protection sleeve two 9 have good mechanical support in structure, which can effectively reduce the contact stress of the pins and the resistance sheet 2, avoid poor contact or damage caused by long-term use or external force, prolong the service life of the equipment, and improve the reliability of the electrical connection. To further enhance the stability of the pins, the sleeve ring one 11 and the sleeve ring two 12 are respectively sleeved on the outer wall of the pin one 3 and the pin two 4, and are connected through the support column 13. The support column 13 ensures the consistency and linearity of the pins, avoids bending or misplacement of the pins due to external impact or pressure during transportation or installation, and the fastening effect of the sleeve ring one 11 and the sleeve ring two 12 ensures that the pins are always in a stable working position, preventing them from bending when accidentally contacting external objects, thereby achieving effective protection effect.

[0035] Working principle: in the process of using the pressure sensitive resistor, the heat generated by the resistor sheet 2 is conducted to the plastic shell 1 by the heat-conducting silica gel pad 5, and the heat is dissipated by the heat dissipation fins 7 on the outer wall of the plastic shell 1. The channels inside the heat dissipation fins 7 increase the heat dissipation area, improve the heat dissipation efficiency, reduce the working temperature of the pressure sensitive resistor, and improve the reliability and stability. At the same time, the plastic shell 1 and the silica gel layer 6 can provide physical protection and insulation buffer for the resistor sheet 2, prevent the influence of external factors, the rubber material anti-skid strip 10 connected by the heat-conducting silica gel pad 5 can increase the friction between the pressure sensitive resistor and the installation surface during installation, prevent accidental sliding, improve the installation stability and reliability, and the protective sleeve one 8 and the protective sleeve two 9 can protect the pins, so that the connection between the pin one 3 and the pin two 4 and the resistor sheet 2 can be effectively supported, and the sleeve ring one 11 and the sleeve ring two 12 are sleeved on the outer wall of the pin one 3 and the pin two 4, and the stability of the pins is increased by connecting the two through the support column 13, the pin one 3 and the pin two 4 can be kept in a stable position during installation or transportation through the action of the sleeve ring one 11 and the sleeve ring two 12, prevent them from bending when accidentally contacting external objects, so as to achieve the effect of effective protection.

[0036] Finally, it should be pointed out that: the above only for the preferred embodiments of the utility model, and does not limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or make equivalent replacement to part of technical features, any modification, equivalent replacement, improvement etc. made within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. A surface mount pressure sensitive resistor comprising a resistor chip (2), characterized in that: The outer wall of the resistance sheet (2) is fixedly connected with a plastic shell (1), the inside of the plastic shell (1) is provided with a silica gel layer (6), the resistance sheet (2) is attached to the silica gel layer (6), the inside of the resistance sheet (2) is provided with a pin (3), the inside of the resistance sheet (2) is provided with a pin (4), the pin (3) and the pin (4) are both arranged in the inside of the plastic shell (1), the outer wall of the plastic shell (1) is provided with a heat dissipation assembly, and the inside of the plastic shell (1) is provided with a protection assembly. The heat dissipation assembly comprises a heat-conducting silica gel pad (5), one end of the heat-conducting silica gel pad (5) is fixedly connected to one side of the outer wall of the plastic shell (1), the other side of the outer wall of the plastic shell (1) is fixedly connected with a heat dissipation fin (7), and the inside of the heat dissipation fin (7) is formed with multiple channels for heat airflow.

2. The surface mount pressure sensitive resistor according to claim 1, wherein: The protection assembly comprises a protection sleeve (8) and a protection sleeve (9), the outer wall of the protection sleeve (8) is fixedly connected in the inside of the plastic shell (1), and the outer wall of the protection sleeve (9) is fixedly connected in the inside of the plastic shell (1).

3. The surface mount pressure sensitive resistor according to claim 2, wherein: The pin (3) and the pin (4) are respectively arranged in the inside of the protection sleeve (8) and the protection sleeve (9).

4. The surface mount pressure sensitive resistor according to claim 3, wherein: The outer wall of the pin (4) is slidably connected with a sleeve ring (11), and the outer wall of the pin (3) is slidably connected with a sleeve ring (12).

5. The surface mount pressure sensitive resistor of claim 4, wherein: The sleeve ring (11) and the sleeve ring (12) are fixedly connected with a support column (13), and the sleeve ring (11) and the sleeve ring (12) are connected through the support column (13).

6. The surface mount pressure sensitive resistor of claim 5, wherein: The sleeve ring (11) and the sleeve ring (12) are both made of polycarbonate material.

7. The surface mount pressure sensitive resistor of claim 1, wherein: The other end of the heat-conducting silica gel pad (5) is fixedly connected with an anti-skid strip (10), and the anti-skid strip (10) is made of rubber material.

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