CN110763357A - Capacitive temperature sensor and use method - Google Patents
Capacitive temperature sensor and use method Download PDFInfo
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- CN110763357A CN110763357A CN201911087724.3A CN201911087724A CN110763357A CN 110763357 A CN110763357 A CN 110763357A CN 201911087724 A CN201911087724 A CN 201911087724A CN 110763357 A CN110763357 A CN 110763357A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K5/00—Measuring temperature based on the expansion or contraction of a material
- G01K5/48—Measuring temperature based on the expansion or contraction of a material the material being a solid
- G01K5/50—Measuring temperature based on the expansion or contraction of a material the material being a solid arranged for free expansion or contraction
- G01K5/52—Measuring temperature based on the expansion or contraction of a material the material being a solid arranged for free expansion or contraction with electrical conversion means for final indication
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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
- G01K7/34—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using capacitative elements
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Abstract
The invention discloses a capacitance type temperature sensor and a use method thereof, wherein the temperature sensor comprises a temperature sensing bag, a capillary tube, a corrugated tube, a base, a temperature sensing working medium, a capacitor left polar plate and a capacitor right polar plate, wherein the base is in an ∟ -shaped plate structure, a vertical plate is provided with a semicircular groove, one end of the corrugated tube is fixedly connected in the semicircular groove and is sequentially and fixedly connected with the capillary tube and the temperature sensing bag outwards, the other end of the corrugated tube is suspended on a horizontal plate of the base, the end surface of the corrugated tube is fixedly connected with the capacitor left polar plate, the capacitor right polar plate is vertically and fixedly connected on the base at a gap from the capacitor left polar plate, and the corrugated tube, the capillary tube and the temperature sensing bag which are communicated are filled with the same temperature sensing working medium.
Description
Technical Field
The invention relates to the technical field of temperature measurement, in particular to a temperature sensor, and more particularly relates to a capacitive temperature sensor and a using method thereof, which are suitable for industrial manufacturing industry and intelligent manufacturing industry.
Background
In the industrial manufacturing industry and the intelligent manufacturing industry, the temperature of equipment and materials is an important parameter, and has great influence on whether a workshop can run normally and the quality of produced products. Currently, there are many ways of measuring temperature used in industrial manufacturing, such as: pressure type temperature measurement system, electric contact thermometer, bimetal thermometer, thermocouple, optical pyrometer, radiation pyrometer and infrared radiation thermometer. However, all of the above methods have certain limitations.
The pressure type temperature measuring system is one of the earliest temperature measuring methods applied to the production process, and is a measuring method which is widely applied to local temperature indication and control. Has the advantages of simple structure, high mechanical strength and vibration resistance; the defects are that the heat loss is large, the response time is slow, the measurement precision is greatly influenced by the environment temperature and the installation position of the temperature sensing bulb, and the capillary transmission distance is limited. The electric contact thermometer has the advantages of high measurement precision and good reproducibility; the defects are that an external power supply is needed, the thermal inertia is large, and the device cannot be used in the occasions with mechanical vibration. The bimetallic thermometer is a local thermometer with wide application, and has the advantages of simple structure, low price and convenient maintenance; the defects are that the measurement precision is lower, and the device is mostly used for site display and occasions without control. Thermocouples account for a large proportion of industrial temperature measurement, and thermocouples are mostly used for remote temperature measurement in the production process. Has the advantages of small volume and convenient installation; the defects are that the thermoelectric force is in a nonlinear relation with the temperature, the precision is lower than the thermal resistance, and the thermocouple junction is easy to age under the same condition. The optical pyrometer has simple structure, light weight and convenient use; the defects are that the measurement is relatively dependent on human eyes, subjective errors are easily introduced, and the price is high. The radiation pyrometer is mainly used in ultra-high temperature occasions where the thermocouple cannot measure. The method has the advantages of high temperature measurement and high response speed; the defects are nonlinear scales, the radiance of a measured object and the absorptivity of a medium in a radiation channel can influence the measurement, and the structure is complex. The infrared thermometer has high precision, quick response time and convenient carrying, but cannot measure large-scale devices, and belongs to portable equipment.
Disclosure of Invention
The invention aims to solve the problems and the defects of the prior art and provides a capacitance type temperature sensor which is simple in structure, quick in response time, small in reading error and high in measurement precision.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
a capacitance type temperature sensor comprises a temperature sensing bag 1, a capillary tube 2, a corrugated tube 3, a base 4, a temperature sensing working medium 5, a capacitor left polar plate 6 and a capacitor right polar plate 7, wherein the base 4 is of an ∟ -shaped plate structure, a semicircular groove is formed in a vertical plate, one end of the corrugated tube 3 is fixedly connected in the semicircular groove and is sequentially and fixedly connected with the capillary tube 2 and the temperature sensing bag 1 outwards, the other end of the corrugated tube is suspended on a transverse plate of the base 4, the end face of the corrugated tube is fixedly connected with the capacitor left polar plate 6, the capacitor right polar plate 7 is vertically and fixedly connected to the base 4 at a gap from the capacitor left polar plate 6, and the corrugated tube 3, the capillary tube 2 and the temperature sensing bag 1 which are communicated are filled with the same temperature sensing working medium.
Furthermore, the base 4, the capacitor left electrode plate 6 and the capacitor right electrode plate 7 are all made of metal materials, wherein the capacitor left electrode plate 6 and the capacitor right electrode plate 7 are made of the same metal material.
Further, the distance between the capacitor left electrode plate 6 and the capacitor right electrode plate 7 is 3-5 mm.
Furthermore, the base 4, the capacitor left electrode plate 6 and the capacitor right electrode plate 7 are all made of metal materials, wherein the capacitor left electrode plate 6 and the capacitor right electrode plate 7 are made of the same metal material.
Further, the fixed connection is welded connection.
Further, the corrugated tube 3 is a cylindrical metal corrugated tube.
Further, the temperature sensing working medium 5 is freon, ethanol or diethyl ether.
Further, the material of the thermal bulb 1 is iron or copper or stainless steel.
The working principle is as follows: the temperature sensing package 1 is continuously and fully contacted with a measured object, temperature change of a temperature sensing working medium 5 filled in a temperature sensing assembly consisting of the temperature sensing package 1, the capillary tube 2 and the corrugated tube 3 is caused, and then a heat expansion and cold contraction phenomenon occurs on the temperature sensing working medium 7, the corrugated tube 3 is driven to expand in volume and generate displacement to the right side, a left electrode plate 6 of the capacitor is driven to move rightwards, the distance between two electrode plates of the capacitor is reduced, the capacitance value output by the capacitor is caused to change, and the temperature of the measured object can be measured by measuring the output capacitance value.
Has the advantages that: compared with the prior art, the invention has the following remarkable characteristics:
1. the invention has simple structure, convenient operation in the using process, small system error and low economic cost.
2. The capacitance type temperature sensor utilizes the volume change generated by the temperature change of the temperature sensing working medium to drive the corrugated pipe to extend and retract towards the right side in a single direction, so that the left pole plate of the capacitor is driven to displace, the capacitance value of the capacitor is changed, the measured data is more real and reliable, and the hysteresis error and the reading error of the temperature sensor are effectively reduced.
3. The capacitance type temperature sensor can select different temperature sensing working media according to different working environments, and has the advantages of wide application range and good temperature measurement effect.
4. The application of the capacitive temperature sensor to the capacitor can reduce the requirement on the quality of a working power supply and achieve the double improvement of energy conservation and safety.
The invention provides a using method of a capacitance type temperature sensor, which comprises the following steps:
a. connecting a capacitor left polar plate 6 and a capacitor right polar plate 7 with a circuit for measuring the capacitance value of the capacitor;
b. the base 4 is placed at a proper position so that the capacitance temperature sensor keeps static and the temperature sensing bulb 1 is in full contact with a measured object;
c. and reading the capacitance value of the capacitor, and further acquiring the temperature value and the temperature variation of the measured object.
Drawings
Figure 1 is a schematic view of the structure of the present invention,
figure 2 is a schematic view of the temperature sensing assembly of the present invention,
figure 3 is a schematic view of the base of the present invention,
the reference numbers in the figures illustrate: 1. the temperature sensing device comprises a temperature sensing bulb, 2 capillary tubes, 3 corrugated tubes, 4 bases, 5 temperature sensing working media, 6 capacitor left pole plates and 7 capacitor right pole plates.
Detailed Description
As shown in figure 1, the capacitance type temperature sensor is composed of a temperature sensing bulb 1, a capillary tube 2, a corrugated tube 3, a base 4, a temperature sensing working medium 5, a capacitor left polar plate 6 and a capacitor right polar plate 7, wherein the base 4 is in an ∟ -shaped plate structure, a semicircular groove is formed in a vertical plate, one end of the corrugated tube 3 is fixedly connected in the semicircular groove and is fixedly connected with the capillary tube 2 and the temperature sensing bulb 1 outwards in sequence, the other end of the corrugated tube is suspended on a transverse plate of the base 4, the end face of the corrugated tube is fixedly connected with the capacitor left polar plate 6, the capacitor right polar plate 7 is vertically and fixedly connected to the base 4 at a gap from the capacitor left polar plate 6, and the corrugated tube 3, the capillary tube 2 and the temperature sensing bulb 1 which are communicated are filled with the same temperature sensing working medium.
In this embodiment, the base 4, the capacitor left plate 6 and the capacitor right plate 7 are made of metal materials, wherein the capacitor left plate 6 and the capacitor right plate 7 are made of the same metal material.
In the embodiment, the distance between the capacitor left plate 6 and the capacitor right plate 7 is 3-5 mm.
In this embodiment, the base 4, the capacitor left plate 6 and the capacitor right plate 7 are made of metal materials, wherein the capacitor left plate 6 and the capacitor right plate 7 are made of the same metal material.
In this embodiment, the fixed connections are all welded connections.
In the present embodiment, the corrugated tube 3 is a cylindrical metal corrugated tube.
In this embodiment, the temperature sensing working medium 5 is freon, ethanol or diethyl ether, and different temperature sensing working media can be selected according to the requirements of the working environment.
In this embodiment, the material of the thermal bulb 1 is iron or copper or stainless steel.
As shown in fig. 2, the temperature sensing assembly of the present embodiment is composed of a bulb 1, a capillary tube 2, and a bellows tube 3; the temperature sensing bulb is a metal cylinder temperature sensing bulb, and the material can be iron, copper or stainless steel; the corrugated pipe is a cylindrical metal corrugated pipe; the temperature sensing assembly is internally provided with the same temperature sensing working medium 5 which can be selected according to specific working environment and measurement temperature range, such as Freon, ethanol and ether; when the temperature sensing device works, the temperature sensing bag 1 is continuously and fully contacted with a measured object, so that the temperature of the internal temperature sensing working medium 5 is changed, the phenomenon of expansion with heat and contraction with cold is generated, and the corrugated pipe 3 is changed in volume and stretches in the right direction.
The working principle of the capacitive temperature sensor of the embodiment is as follows: the temperature sensing package 1 is kept in full contact with a measured object, temperature change of a temperature sensing working medium 5 filled in a temperature sensing assembly consisting of the temperature sensing package 1, the capillary tube 2 and the corrugated tube 3 is caused, and then the temperature sensing working medium 5 is subjected to expansion with heat and contraction with cold, the corrugated tube 3 is driven to expand in volume and generate displacement to the right side, a left electrode plate 6 of the capacitor is driven to move rightwards, the distance between two electrode plates of the capacitor is reduced, the capacitance value output by the capacitor is caused to change, and the temperature of the measured object can be measured by measuring the output capacitance value.
The use method of the capacitive temperature sensor of the embodiment comprises the following steps:
a. connecting a capacitor left polar plate 6 and a capacitor right polar plate 7 with a circuit for measuring the capacitance value of the capacitor;
b. the base 4 is placed at a proper position, so that the capacitance temperature sensor keeps static and the temperature sensing bulb 1 is continuously and fully contacted with a measured object;
c. and reading the capacitance value of the capacitor, and further acquiring the temperature value and the temperature variation of the measured object.
It should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and not intended to limit the scope of the invention, therefore, all equivalent changes in the principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A capacitance type temperature sensor is characterized by comprising a temperature sensing bulb (1), a capillary tube (2), a corrugated tube (3), a base (4), a temperature sensing working medium (5), a capacitor left polar plate (6) and a capacitor right polar plate (7), wherein the base (4) is of an ∟ -shaped plate structure, a vertical plate is provided with a semicircular groove, one end of the corrugated tube (3) is fixedly connected in the semicircular groove and is fixedly connected with the capillary tube (2) and the temperature sensing bulb (1) outwards in sequence, the other end of the corrugated tube is suspended on a transverse plate of the base (4), the end face of the corrugated tube is fixedly connected with the capacitor left polar plate (6), the capacitor right polar plate (7) is vertically and fixedly connected to the base (4) with a gap away from the capacitor left polar plate (6), and the same temperature sensing working medium (5) is filled in the corrugated tube (3), the capillary tube (2) and the temperature sensing bulb (1) which are communicated.
2. The capacitive temperature sensor of claim 1, wherein: the base (4), the capacitor left polar plate (6) and the capacitor right polar plate (7) are all made of metal materials, wherein the capacitor left polar plate (6) and the capacitor right polar plate (7) are made of the same metal material.
3. The capacitive temperature sensor of claim 1, wherein: the distance between the capacitor left pole plate (6) and the capacitor right pole plate (7) is 3-5 mm.
4. The capacitive temperature sensor of claim 1, wherein: the fixed connection is welded connection.
5. The capacitive temperature sensor of claim 1, wherein: the corrugated pipe (3) is a cylindrical metal corrugated pipe.
6. The capacitive temperature sensor of claim 1, wherein: the temperature sensing working medium (5) is freon or ethanol or diethyl ether.
7. The capacitive temperature sensor of claim 1, wherein: the material of the temperature sensing bulb (1) is iron or copper or stainless steel.
8. Use of a capacitive temperature sensor according to any one of claims 1 to 7, characterized in that it comprises the following steps:
a. connecting the left electrode plate (6) and the right electrode plate (7) of the capacitor with a circuit for measuring the capacitance value of the capacitor;
b. selecting a proper position to place the base (4) so that the capacitance type temperature sensor keeps still and the temperature sensing bulb (1) is in full contact with the object to be measured;
c. and reading the capacitance value of the capacitor, and further acquiring the temperature value and the temperature variation of the measured object.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911087724.3A CN110763357A (en) | 2019-11-08 | 2019-11-08 | Capacitive temperature sensor and use method |
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| CN201911087724.3A CN110763357A (en) | 2019-11-08 | 2019-11-08 | Capacitive temperature sensor and use method |
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Cited By (2)
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| CN111721434A (en) * | 2020-07-01 | 2020-09-29 | 盐城师范学院 | Distribution bus joint heating sensor |
| CN112315334A (en) * | 2020-09-30 | 2021-02-05 | 宁波方太厨具有限公司 | Oven with humidifying and baking functions and temperature measuring and humidity measuring method thereof |
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| CN112315334B (en) * | 2020-09-30 | 2022-02-18 | 宁波方太厨具有限公司 | Oven with humidifying and baking functions and temperature measuring and humidity measuring method thereof |
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Application publication date: 20200207 |