High-temperature-resistant ceramic thermistor

Abstract

The utility model discloses a high-temperature-resistant ceramic thermistor which comprises an installation box, a heat conduction steel sheet is fixedly installed on the top of the installation box, filter screens are fixedly installed on the two sides of the top of the installation box, heat dissipation holes are formed in the two sides of the outer surface of the installation box, and a thermistor body is arranged in an inner cavity of the installation box. The top of the thermistor body is fixedly provided with a heat conduction pad, and the top of the heat conduction pad is fixedly provided with a heat conduction pipe. According to the technical scheme, the problems that an existing thermistor is poor in high-temperature-resistant effect, the resistance value of the thermistor possibly changes greatly and exceeds the normal working range of the thermistor due to high temperature, the measurement or control precision is reduced, and in some high-precision temperature measurement circuits, the temperature measurement precision is poor are solved. The resistance value deviation of the thermistor caused by high temperature may cause obvious error of the measurement result, and the high temperature also enables the response time of the thermistor to be prolonged, that is, the response speed to the temperature change is slowed down.

Description

Technical Field

[0001] This utility model relates to the field of thermistor technology, specifically to a high-temperature resistant ceramic thermistor. Background Technology

[0002] A thermistor is a special type of variable resistor whose resistance changes significantly with temperature. Thermistors are typically made of semiconductor-based sensitive metal oxides with metallized or sintered leads, forming a ceramic disk or bead structure. This characteristic allows thermistors to proportionally change their resistance based on minute changes in ambient temperature, making them widely used in temperature detection circuits. However, existing thermistors do not perform well at high temperatures. High temperatures can cause significant changes in the thermistor's resistance, exceeding its normal operating range and reducing measurement or control accuracy. In some high-precision temperature measurement circuits, resistance deviations caused by high temperatures can lead to significant errors in measurement results. High temperatures also increase the thermistor's response time, meaning it slows down its reaction to temperature changes. Utility Model Content

[0003] The purpose of this invention is to provide a high-temperature resistant ceramic thermistor with the advantage of high temperature resistance.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature resistant ceramic thermistor, comprising a mounting box, a heat-conducting steel sheet fixedly mounted on the top of the mounting box, filters fixedly mounted on both sides of the top of the mounting box, heat dissipation holes opened on both sides of the outer surface of the mounting box, a thermistor body disposed in the inner cavity of the mounting box, a heat-conducting pad fixedly mounted on the top of the thermistor body, a heat-conducting pipe fixedly mounted on the top of the heat-conducting pad, and a heat-conducting sheet fixedly connected to the inner cavity of the thermistor body.

[0005] As a preferred embodiment, the top of the thermal pad is fixedly mounted with a mounting bolt, and one side of the mounting bolt is fixedly mounted to the top of the thermistor body.

[0006] As a preferred embodiment, two leads are fixedly installed at the bottom of the thermistor body.

[0007] As a preferred embodiment, the thermistor body includes an epoxy resin coating, and the outer surface of the thermistor body is coated with a polyurethane coating.

[0008] As a preferred embodiment, the outer surface of the polyurethane coating is coated with a zinc-rich coating, and the outer surface of the zinc-rich coating is coated with a ceramic coating.

[0009] As a preferred embodiment, the ceramic coating includes a cemented carbide coating, the outer surface of which is coated with a boron nitride coating.

[0010] As a preferred embodiment, the outer surface of the boron nitride coating is coated with a polytetrafluoroethylene coating, and the outer surface of the polytetrafluoroethylene coating is coated with a graphene coating layer.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This invention solves the problems of poor high-temperature resistance of existing thermistors, which can cause significant changes in the resistance of thermistors due to high temperatures, exceeding their normal operating range and reducing measurement or control accuracy. In some high-precision temperature measurement circuits, the resistance deviation of the thermistor caused by high temperature may lead to significant errors in the measurement results. High temperature also increases the response time of the thermistor, that is, slows down the reaction speed to temperature changes. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a sectional view of the mounting box structure of this utility model;

[0015] Figure 3 This is a cross-sectional view of the thermistor body structure of this utility model;

[0016] Figure 4 This is a cross-sectional view of the ceramic coating structure of this utility model.

[0017] In the diagram: 1. Thermistor body; 2. Thermal pad; 3. Heat dissipation hole; 4. Thermal plate; 5. Mounting bolt; 6. Heat pipe; 7. Lead wire; 8. Mounting box; 9. Thermally conductive steel sheet; 10. Filter screen; 101. Epoxy resin coating; 102. Polyurethane coating; 103. Zinc-rich coating; 104. Ceramic coating; 1041. Hard alloy coating; 1042. Boron nitride coating; 1043. Polytetrafluoroethylene coating; 1044. Graphene coating layer. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. Example 1

[0020] Please see Figure 1 and Figure 2 As shown, this utility model provides a high-temperature resistant ceramic thermistor, including a mounting box 8. A heat-conducting steel sheet 9 is fixedly installed on the top of the mounting box 8. Filter screens 10 are fixedly installed on both sides of the top of the mounting box 8. Heat dissipation holes 3 are opened on both sides of the outer surface of the mounting box 8. A thermistor body 1 is provided in the inner cavity of the mounting box 8. A heat-conducting pad 2 is fixedly installed on the top of the thermistor body 1. A heat-conducting pipe 6 is fixedly installed on the top of the heat-conducting pad 2. A heat-conducting sheet 4 is fixedly connected to the inner cavity of the thermistor body 1.

[0021] This technical solution addresses the problems of poor high-temperature resistance of existing thermistors, which can cause significant changes in resistance beyond their normal operating range due to high temperatures, leading to decreased measurement or control accuracy. In some high-precision temperature measurement circuits, resistance deviations caused by high temperatures can result in significant errors in measurement results. High temperatures also increase the response time of thermistors, slowing down their reaction to temperature changes. Example 2

[0022] Based on Embodiment 1, this utility model is as follows: Figures 2-4 As shown, a mounting bolt 5 is fixedly installed on the top of the thermal pad 2, and one side of the mounting bolt 5 is fixedly installed on the top of the thermistor body 1. Two leads 7 are fixedly installed on the bottom of the thermistor body 1. The thermistor body 1 includes an epoxy resin coating 101, a polyurethane coating 102 on the outer surface of the thermistor body 1, a zinc-rich coating 103 on the outer surface of the polyurethane coating 102, a ceramic coating 104 on the outer surface of the zinc-rich coating 103, a hard alloy coating 1041 on the outer surface of the hard alloy coating 1041, a boron nitride coating 1042 on the outer surface of the boron nitride coating 1042, a polytetrafluoroethylene coating 1043 on the outer surface of the boron nitride coating 1043, and a graphene coating layer 1044 on the outer surface of the polytetrafluoroethylene coating 1043.

[0023] Using the above technical solution, the installation bolts 5 are used to install the heat-conducting pipe 6 and the heat-conducting pad 2. The lead wires 7 are used to connect the thermistor body 1. The epoxy resin coating 101 provides strong resistance to chemical corrosion and good resistance to various chemicals such as acids, alkalis, and salts. It also has good wear resistance and insulation. The polyurethane coating 102 provides outstanding wear resistance, effectively resisting mechanical wear and friction. It also has good weather resistance, maintaining stable performance in outdoor environments for a long time and is not easily corroded by ultraviolet rays, rain, wind, and sand. The hard alloy coating 1041 provides extremely high hardness and wear resistance, significantly improving the wear resistance of the substrate and effectively resisting wear, erosion, and friction. The boron nitride coating 1042 provides high hardness, low coefficient of friction, good wear resistance, and chemical stability, effectively reducing friction and wear.

[0024] The working principle of this utility model is as follows: When the ambient temperature changes, the heat is first transferred to the heat-conducting steel sheet 9 on the top of the mounting box 8. Due to the good thermal conductivity of the heat-conducting steel sheet 9, the heat can be quickly dissipated. The heat dissipation holes 3 on both sides of the outer surface of the mounting box 8 can form convection with the outside air, which helps to dissipate the heat inside the mounting box 8 and maintain the relative stability of the internal temperature. The filters 10 on both sides of the top of the mounting box 8 can prevent dust and other impurities from entering the interior of the mounting box 8 while ensuring air circulation, so as to avoid affecting the performance of the thermistor body 1. In the inner cavity of the mounting box 8, the heat-conducting pad 2 fixedly installed on the top of the thermistor body 1 plays a key role. It can efficiently transfer the heat generated by the thermistor body 1 to the heat-conducting pipe 6 above. The heat-conducting pipe 6 further guides the heat to the top of the mounting box 8. At the same time, the heat-conducting sheet 4 fixedly connected to the inner cavity of the thermistor body 1 is also working actively. It can quickly and evenly distribute the heat in different parts of the thermistor body 1, so that the overall temperature change of the thermistor body 1 tends to be consistent, and improves its accuracy of temperature sensing.

[0025] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0026] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A high-temperature resistant ceramic thermistor, comprising a mounting box (8), characterized in that: A heat-conducting steel sheet (9) is fixedly installed on the top of the mounting box (8). A filter screen (10) is fixedly installed on both sides of the top of the mounting box (8). Heat dissipation holes (3) are opened on both sides of the outer surface of the mounting box (8). A thermistor body (1) is provided in the inner cavity of the mounting box (8). A heat-conducting pad (2) is fixedly installed on the top of the thermistor body (1). A heat-conducting pipe (6) is fixedly installed on the top of the heat-conducting pad (2). A heat-conducting sheet (4) is fixedly connected to the inner cavity of the thermistor body (1).

2. The high-temperature resistant ceramic thermistor according to claim 1, characterized in that: The top of the thermal pad (2) is fixedly installed with a mounting bolt (5), and one side of the mounting bolt (5) is fixedly installed on the top of the thermistor body (1).

3. The high-temperature resistant ceramic thermistor according to claim 1, characterized in that: The thermistor body (1) is fixedly mounted with two leads (7) at its bottom.

4. The high-temperature resistant ceramic thermistor according to claim 1, characterized in that: The thermistor body (1) includes an epoxy resin coating (101), and the outer surface of the thermistor body (1) is coated with a polyurethane coating (102).

5. A high-temperature resistant ceramic thermistor according to claim 4, characterized in that: The outer surface of the polyurethane coating (102) is coated with a zinc-rich coating (103), and the outer surface of the zinc-rich coating (103) is coated with a ceramic coating (104).

6. The high-temperature resistant ceramic thermistor according to claim 5, characterized in that: The ceramic coating (104) includes a cemented carbide coating (1041), the outer surface of which is coated with a boron nitride coating (1042).

7. A high-temperature resistant ceramic thermistor according to claim 6, characterized in that: The outer surface of the boron nitride coating (1042) is coated with a polytetrafluoroethylene coating (1043), and the outer surface of the polytetrafluoroethylene coating (1043) is coated with a graphene coating layer (1044).

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