CN113607300A - Sleeve type temperature sensor - Google Patents
Sleeve type temperature sensor Download PDFInfo
- Publication number
- CN113607300A CN113607300A CN202010336287.0A CN202010336287A CN113607300A CN 113607300 A CN113607300 A CN 113607300A CN 202010336287 A CN202010336287 A CN 202010336287A CN 113607300 A CN113607300 A CN 113607300A
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- Prior art keywords
- thermistor
- shell
- temperature sensor
- temperature
- sleeve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/08—Protective devices, e.g. casings
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention discloses a sleeve-penetrating type temperature sensor, which is characterized by comprising: the thermal resistor comprises a shell, glue, a thermistor and insulating sleeves, wherein the thermistor penetrates through the shell, and the insulating sleeves penetrate through two ends of the thermistor; the invention has the advantages that because only the lead is subjected to insulation treatment, the exposed temperature sensing head is in direct contact with the shell, the volume of the product is reduced, the installation space of the product is reduced, the electrical safety of the product is ensured, the comprehensive protection capability of the product is improved, the application range of the product is expanded, the wrapping layer outside the thermistor is greatly reduced, the influence of the thermal resistance and the heat storage of the insulating material on the detection temperature sensitivity and the reaction speed is avoided, in addition, the problems caused by the large-area epoxy resin encapsulating process are avoided due to the sleeve penetrating type structure, the production efficiency is improved, the manufacturing cost is reduced, and the consistency and the reliability of the product are ensured.
Description
Technical Field
The invention relates to the technical field of temperature detection, in particular to a temperature sensor which is provided with a thermistor sleeved in a hollow pipe and is sensitive and quick to respond to temperature change.
Background
A temperature sensor including a conventional thermistor generally includes: the temperature sensors used for atmospheric environment detection, such as a household electronic thermometer, an air conditioner temperature sensor and the like, and the temperature sensors used in special environments, such as an automobile water temperature sensor, an oil temperature sensor, an electric cooker bottom and upper cover temperature sensor and the like.
As the temperature sensor used in the atmospheric environment, the use environment is flat and stable, the temperature range required to be detected is small, and the temperature sensor has no higher electrical safety requirement, in order to improve the response speed of the product to the temperature change, a packaging mode of wrapping a layer of epoxy resin outside the thermistor is mostly adopted, the application environment of the temperature sensor is greatly limited due to simple and rough production process, and the temperature response difference is large due to poor consistency of the epoxy resin wrapping layer; as the temperature sensor used in special environment, in order to guarantee the electrical safety, corrosion resistance and durability of the product, the temperature-sensitive device is wrapped with a plurality of layers of materials which can meet the performance requirements, such as the water temperature and oil temperature sensor of an automobile, and the upper cover sensor of an electric rice cooker, a thermistor of which the whole body is sleeved with an insulating tube is packaged in a metal shell by epoxy resin, an electrical connection lead is led out in one direction, and the bottom temperature sensor of the electric rice cooker is formed by sleeving at least two layers of insulating materials on the thermistor and then clamping and pressing the thermistor on the inner side of the metal shell; although the comprehensive performance of the two temperature sensors is greatly improved, the temperature sensors are insensitive to small temperature changes due to the fact that the number of insulation materials wrapping the thermistors is large, the thermal conductivity of the insulation materials is different, and differences are generated among parts during manufacturing, and provided temperature detection signals have serious hysteresis (namely, when the actual temperature reaches 100 ℃, the temperature sensors can provide the detection signals of 100 ℃ after tens of seconds or even longer).
Disclosure of Invention
The invention aims to adopt a structural mode that only the lead is subjected to insulation treatment, and the thermistor with the exposed temperature sensing head penetrates through the hollow tube, and adopts an optimized structure and production process to reduce the wrapping layer of the thermistor to the maximum extent, so that the thermistor can directly carry out temperature detection sampling through the shell, and further a novel temperature sensor which has sensitive and quick response to tiny temperature change, obviously improved detection signal hysteresis, good electrical safety, corrosion resistance, water and dust resistance and wide application range is obtained.
In order to achieve the above object, according to the technical solution of the present invention, a sleeve type temperature sensor is characterized by comprising:
the thermal resistor comprises a shell, glue, a thermistor and insulating sleeves, wherein the thermistor penetrates through the shell, and the insulating sleeves penetrate through two ends of the thermistor;
a housing: the shell is a hollow tube;
a thermistor: the thermistor is a device which is sensitive to temperature change, shows different resistance values at different temperatures and consists of a temperature sensing head and leads which are led out from two ends of the temperature sensing head and can be electrically connected;
insulating sleeve: the insulating sleeve is a non-metal tube which has good electrical insulation, good elasticity and toughness and is provided with a through hole;
glue water: the glue is a chemical reagent which has good electrical insulation performance and can be cured automatically from a fluid state.
Furthermore, the penetrating sleeve type temperature sensor is characterized in that glue is applied to the joint of the temperature sensing head of the thermistor and the lead wire or glue is not applied to the joint, the two insulating sleeves are respectively penetrated and sleeved on the lead wire, so that the insulating sleeves are attached to the end face of the temperature sensing head, the thermistor with the insulating sleeves exposed out of the temperature sensing head is penetrated, and after the thermistor is inserted from one end of the shell and penetrates out of the other end of the shell, the thermistor is directly conducted and temperature is detected through the shell.
Furthermore, the sleeve type temperature sensor is characterized in that the through hole of the insulating sleeve is in clearance fit with the lead wire or in transition fit or interference fit, the thermistor sleeved with the insulating sleeve is inserted into one end of the shell and penetrates out of the other end of the shell, the two ends of the shell are positioned on the inner sides of the two ends of the insulating sleeve or are parallel and level with the outer sides of the two ends of the insulating sleeve, and the inner wall of the shell, the temperature sensing head and the outer wall of the insulating sleeve are in transition fit or in clearance fit.
The invention adopts the following additional technical scheme:
the shell is made of metal material, or nonmetal material, or metal and nonmetal composite material.
After the temperature sensor is assembled, the two ends of the shell are not processed or are riveted.
The temperature sensor may be left in the "-" shape after assembly, bent into the "U" shape, or any other desired shape.
The invention has the advantages that because only the lead is subjected to insulation treatment, the exposed temperature sensing head is in direct contact with the shell, the volume of the product is reduced, the installation space of the product is reduced, the electrical safety of the product is ensured, the comprehensive protection capability of the product is improved, the application range of the product is expanded, the wrapping layer outside the thermistor is greatly reduced, the influence of the thermal resistance and the heat storage of the insulating material on the detection temperature sensitivity and the reaction speed is avoided, in addition, the problems caused by the large-area epoxy resin encapsulating process are avoided due to the sleeve penetrating type structure, the production efficiency is improved, the manufacturing cost is reduced, and the consistency and the reliability of the product are ensured. Additional effects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is an exploded cross-sectional view of an embodiment temperature sensor;
FIG. 2 is a semi-sectional view of an embodiment temperature sensor in the "-" type;
FIG. 3 is a front view of the temperature sensor of the embodiment in a U shape as a whole;
FIG. 4 is a front view of an embodiment of a temperature sensor housing in the "-" shape with an insulating sleeve and leads in the "U" shape.
Reference numerals: 1. a housing; 2. an insulating sleeve; 3. a thermistor; 31. a temperature sensing head; 32. a lead wire; 66. a temperature sensor; A. pressing and riveting; B. and (6) a joint.
The specific implementation mode is as follows:
embodiments of the invention will now be described in detail with reference to the drawings, wherein like reference numerals designate identical or similar elements or elements having identical or similar functions. The following examples are illustrative only for the purpose of illustrating the present invention and are not to be construed as simply limiting the invention.
The description of the invention refers to conceptual illustrations. Electrical connection: the term "electrical connection" is used broadly to refer to the collection of all electrical circuits in an electrical product, including power connections such as power plugs, power terminals, etc., power cords, internal conductors, internal connections, etc., and the term "electrical connection" is used only to refer to all ways of connecting different conductors within a product. The terms and terminology "lead," "bushing," "clearance fit," "transition fit," "interference fit," "clinch," and the like are to be construed broadly based on the known art and in conjunction with the description herein, unless otherwise expressly specified or limited. Therefore, the meanings of the above-mentioned nouns and terms in the present invention can be understood according to specific situations by those skilled in the art.
A temperature sensor of the present invention will be described in detail with reference to fig. 1 to 4.
The technical scheme of the invention is that a sleeve type temperature sensor (66) is characterized by comprising: as shown in fig. 1 and 2, the thermistor comprises a shell (1), glue, a thermistor (3) sleeved in the shell (1) in a penetrating way, and insulating sleeves (2) sleeved at two ends of the thermistor (3) in a penetrating way.
The shell (1) is a hollow pipe made of a metal material or a non-metal material or a metal and non-metal composite material, and further, the shell (1) is preferably a thin-wall seamless metal pipe with the wall thickness of less than 0.5mm so as to reduce heat transfer of a thin-wall section, increase and accelerate heat conduction of a contact surface and improve mechanical strength and corrosion resistance.
The thermistor comprises a thermistor (3), wherein the thermistor (3) is sensitive to temperature change, shows different resistance values at different temperatures, and is a device consisting of a temperature sensing head (31) and leads (32) which are led out from two ends of the temperature sensing head (31) and can be electrically connected, and further, the thermistor (3) is of a PTC type or an NTC type, and preferably, the leads (32) are glass glaze PTC type thermistors (3) led out from two ends.
The insulating sleeve (2) is made of silica gel or silicon rubber or polytetrafluoroethylene plastic, the wall thickness of the insulating sleeve (2) is larger than 0.5mm, the insulating sleeve has good electrical insulation, good elasticity and toughness, and a non-metal pipe with a through hole is provided, and the insulating sleeve (2) is preferably prepared by performing secondary high-temperature vulcanization treatment on the silica gel below 60 degrees Shore from the aspects of price, temperature resistance, environmental protection and the like.
The glue is a chemical reagent which has good electrical insulation performance and can be automatically cured from a fluid state, such as liquid single-component silica gel, silicone adhesive or epoxy resin, and 704 silica gel is preferably selected from the comprehensive consideration of production process, efficiency, curing time and the like. (since the glue is in a liquid state, it is not illustrated in the drawings, and thus is not shown in the drawings)
Furthermore, as shown in fig. 2, the sleeve-penetrating type temperature sensor (66) is characterized in that under the condition that a proper amount of glue is applied to the joint (B) of the temperature sensing head (31) and the lead (32) of the thermistor (3) or no glue is applied, two insulating sleeves (2) are inserted into the lead (32), the lead is pushed to the temperature sensing head (31) from two sides and is respectively sleeved on the lead (32), so that the end surfaces of the insulating sleeves (2) and the temperature sensing head (31) are well jointed, then the thermistor (3) sleeved with the insulating sleeves (2) is exposed from the temperature sensing head (31), after the thermistor is inserted from one end of the shell (1) and penetrates out from the other end, because only two end surfaces of the temperature sensing head (31) of the thermistor (3) are contacted with the insulating sleeves (2), and the temperature sensing body is contacted with the inner wall of the shell (1) in a large area, the influence of the thermistor (3) by the heat of the insulating sleeves (2) is small, the temperature conduction and detection are directly carried out through the shell (1), so that the temperature sensor (66) can have the characteristics of sensitive and quick response to tiny temperature changes no matter the temperature changes from low to high or from high to low; furthermore, the scheme of applying glue water to the joint (B) of the temperature sensing head (31) and the lead (32) is preferably adopted, so that the compression strength of the temperature sensor (66) can be improved from 1000V/s to 1500V/s, and the fixing and sealing of the thermistor (3) in the shell (1) are facilitated due to the self-curing effect of the glue water.
Further, as shown in fig. 1 and fig. 2, the bushing type temperature sensor (66) is characterized in that the through hole of the insulating bushing (2) is preferably in interference fit with the lead (32) so as to utilize the insulating bushing (2) to well protect the lead (32), and then transition fit or clearance fit is adopted to improve the efficiency for bushing; the thermistor (3) is sleeved with the insulating sleeve (2) in a penetrating mode, after the thermistor is inserted from one end of the shell (1) and penetrates out from the other end of the shell, the length of two ends of the shell (1) is in a position relation with the insulating sleeve (2), in order to improve the qualification rate and the sealing performance of a product in the subsequent press riveting (A) process, the scheme that two ends of the shell (1) are located on the inner sides of two ends of the insulating sleeve (2) is optimized, and then the scheme that the two ends of the shell are parallel to the outer sides of two ends of the insulating sleeve (2) is adopted; the relation between the inner wall of the shell (1) and the outer wall of the temperature sensing head (31) is preferably in transition fit to improve the contact area of the shell and the temperature sensing head, the conduction and detection reaction speed of temperature is improved, and then the production efficiency is improved by adopting clearance fit; the relation of shell (1) inner wall and insulating cover (2) outer wall, preferred clearance fit conveniently wears the cover raise the efficiency, secondly strengthens the leakproofness with transition fit.
Further, as shown in fig. 2 to 4, after the temperature sensor (66) is assembled, depending on the use environment, both ends of the case (1) do not need to be processed for the purpose of reducing the production cost, and in order to enhance the sealing property of the temperature sensor (66) and to improve the mechanical strength and corrosion resistance thereof, the caulking (a) process may be performed at a position where the case (1) and the insulating sleeve (2) overlap by virtue of the elasticity and toughness of the insulating sleeve (2).
Furthermore, as shown in fig. 2 to 4, after the temperature sensor (66) is assembled, the shape thereof can be processed according to the requirement, the shape is preferably "-" in general, and the shape is bent into "U" in special cases or other shapes, and when the shape is bent into "U", in order to avoid the damage of the shell (1), the shell (1) is preferably not bent, and only the part of the lead (32) of the insulating sleeve (2) is bent and sleeved.
Claims (6)
1. A temperature sensor of the sleeve-through type, comprising:
the thermal resistor comprises a shell, glue, a thermistor and insulating sleeves, wherein the thermistor penetrates through the shell, and the insulating sleeves penetrate through two ends of the thermistor;
a housing: the shell is a hollow tube;
a thermistor: the thermistor is a device which is sensitive to temperature change, shows different resistance values at different temperatures and consists of a temperature sensing head and leads which are led out from two ends of the temperature sensing head and can be electrically connected;
insulating sleeve: the insulating sleeve is a non-metal tube which has good electrical insulation, good elasticity and toughness and is provided with a through hole;
glue water: the glue is a chemical reagent which has good electrical insulation performance and can be cured automatically from a fluid state.
2. The threading type temperature sensor according to claim 1, wherein two insulation sleeves are respectively threaded and sleeved on the lead wire under the condition that glue is or is not applied to the joint of the temperature sensing head and the lead wire of the thermistor, so that the insulation sleeves are attached to the end face of the temperature sensing head, the thermistor with the insulation sleeve exposed out of the temperature sensing head is inserted from one end of the shell and penetrates out from the other end of the shell, and the thermistor directly conducts and detects temperature through the shell.
3. The bushing type temperature sensor according to claim 1, wherein the through hole of the insulation sleeve is in clearance fit with the lead wire, or in transition fit, or in interference fit, the thermistor inserted with the insulation sleeve is inserted from one end of the housing and then penetrates out from the other end, the two ends of the housing are located inside the two ends of the insulation sleeve, or are flush with the outside of the two ends of the insulation sleeve, and the inner wall of the housing, the temperature sensing head and the outer wall of the insulation sleeve are in transition fit or in clearance fit.
4. The temperature sensor of claim 1, wherein the housing is made of a metal material, a non-metal material, or a composite material of metal and non-metal.
5. The temperature sensor of claim 1, wherein the temperature sensor is assembled without any treatment or riveting at both ends of the housing.
6. A temperature sensor according to claim 1, wherein the temperature sensor is shaped like a-line after assembly, or bent like a U-shape, or other desired shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336287.0A CN113607300A (en) | 2020-04-20 | 2020-04-20 | Sleeve type temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336287.0A CN113607300A (en) | 2020-04-20 | 2020-04-20 | Sleeve type temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113607300A true CN113607300A (en) | 2021-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010336287.0A Pending CN113607300A (en) | 2020-04-20 | 2020-04-20 | Sleeve type temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113607300A (en) |
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2020
- 2020-04-20 CN CN202010336287.0A patent/CN113607300A/en active Pending
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