CN214619670U

CN214619670U - Passive temperature sensor

Info

Publication number: CN214619670U
Application number: CN202120956219.4U
Authority: CN
Inventors: 徐磊磊
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-11-05
Anticipated expiration: 2031-04-30

Abstract

The application relates to a passive temperature sensor, which comprises a thermocouple, an aviation connector, a high-efficiency converter, an energy storage and processing circuit and a wireless transmitter; the thermocouple is used for sensing the temperature of a flame area of the high-temperature equipment and converting a detected temperature signal into a thermoelectromotive force signal; the aviation connector is used for connecting the thermocouple and the high-efficiency converter and is used for transmitting signals; the high-efficiency converter is used for converting the thermoelectromotive force signal at a high multiplying power and forming a first electric signal; the energy storage and processing circuit is used for receiving the first electric signal, storing energy and logically analyzing the data to form a second trigger signal; the wireless transmitter is used for wireless communication and transmitting the second trigger signal to the external signal receiving end. This application has the effect that makes the cable be difficult to damage because of the high temperature.

Description

Passive temperature sensor

Technical Field

The application relates to the field of high-temperature equipment, in particular to a passive temperature sensor.

Background

The fuel is combusted in the hearth, and a chemical reaction occurs to release a large amount of energy. The energy is released in the forms of light energy (ultraviolet light, visible light, infrared light), heat energy and the like, different energy forms form the basis for detecting the combustion flame in the furnace, and various flame detectors can be designed by applying different flame characteristics.

The flame detector is matched with the ignition programmer for use, and the flame detector is used for jointly completing boiler ignition process control and flame detection control of the operating boiler and giving an alarm in case of no fire, so that the safe operation of the boiler is ensured. The method can be used for boilers, reaction kettles, heat conduction pipes, industrial cooking benches, commercial cooking benches and high-temperature equipment.

The basic requirement of boiler combustion is to establish and maintain a stable combustion flame. Unstable combustion not only reduces the thermal efficiency of the boiler, but also causes fire extinguishment in a boiler furnace, and if improper treatment causes boiler deflagration, accidents are caused. In order to timely and reliably detect the combustion condition in the hearth and prevent hearth deflagration accidents under the low-load unstable combustion condition, the boiler must be provided with a perfect hearth safety monitoring system, and the normal operation of the hearth safety monitoring system is based on accurate and reliable flame signals. The flame detector is an important front-end device, and whether the signal provided by the flame detector is accurate or not plays a necessary role in determining whether a furnace safety monitoring system is in normal operation or not.

In the related art, for detecting the flame temperature of high-temperature equipment, a longer lead is needed during temperature measurement, and the lead is easy to damage and inconvenient in a high-temperature use environment.

SUMMERY OF THE UTILITY MODEL

In order to make the cable be difficult to damage because of the high temperature, this application provides a passive temperature sensor.

The application provides a passive temperature sensor adopts following technical scheme:

a passive temperature sensor comprises a thermocouple, an aviation connector, a high-efficiency converter, an energy storage and processing circuit and a wireless transmitter;

the thermocouple is used for sensing the temperature of a flame area of high-temperature equipment and converting a detected temperature signal into a thermoelectromotive force signal;

the aviation connector is used for connecting the thermocouple and the high-efficiency converter and is used for transmitting signals;

the high-efficiency converter is used for converting the thermoelectromotive force signal at a high multiplying power and forming a first electric signal;

the energy storage and processing circuit is used for receiving the first electric signal, storing energy and logically analyzing the data to form a second trigger signal;

the wireless transmitter is used for wireless communication and transmitting the second trigger signal to an external signal receiving end.

By adopting the technical scheme, the thermocouple device can be used for sensing flame of high-temperature equipment such as a cooking bench and the like, when the thermocouple senses the flame temperature, the heat energy of the thermocouple device is converted into electric energy, and the electric energy is logically analyzed through the high-efficiency converter and the energy storage and processing circuit, so that the cable is not required to be damaged due to overhigh temperature caused by the fact that a user is connected with any cable in the process.

Optionally, the energy storage and processing circuit comprises an LTC31081 processing chip and its peripheral circuits and energy storage display circuitry.

By adopting the technical scheme, the lowest 20mV input of the LTC31081 is provided, and a complete energy collection management system is provided, so that 2.35v, 3.3v, 4.1v, 5v and the like can be output; the selectable low dropout linear regulator is 3mA-2, and when in output: logic control output, reserve energy output.

Optionally, the high efficiency converter is set to 1: 100, the first electrical signal is 100 times the thermal electromotive force signal.

By adopting the technical scheme, the value of the thermoelectromotive force signal generated by the thermocouple is tiny, so that the thermoelectromotive force signal is amplified by 100 times by the high-efficiency converter, and the later-stage data calculation and analysis are facilitated.

Optionally, when the current temperature is higher than or equal to 400 ℃, energy collection of the passive temperature sensor is started, and an energy source amplified by 100 ℃ is collected for energy storage; when the temperature is continuously more than or equal to 400 ℃ for 30 seconds, the passive temperature sensor intermittently sends out a starting signal.

By adopting the technical scheme, 400 ℃ is used as a judgment reference, in order to achieve more accurate detection, the starting signal is sent out after the time delay of 400 ℃ is 30 seconds, the interval of 30S is the minimum guarantee value, which means that the energy collection of 30S is enough for one time, and is a condition for data sending, otherwise, the energy is insufficient, and the data is not sent enough, so the sending time can be prolonged as required, but cannot be reduced.

Optionally, the energy storage display circuit comprises a plurality of light emitting diodes connected in series, the positive electrode of the plurality of light emitting diodes connected in series is electrically connected to an external power source, the negative electrode is electrically connected to the 12 pin of the LTC31081 chip, and the negative electrode is grounded through a protection resistor R1.

By adopting the technical scheme, the plurality of light emitting diodes are used for displaying the working state of the chip.

Optionally, a capacitor C1 is connected in parallel to two ends of the protection resistor R1.

By adopting the technical scheme, the capacitor C1 plays a role in filtering.

Optionally, the wireless transmitter is configured as a 433 transmitter.

By adopting the technical scheme, the working frequency of the data transmitting module is 315M, the SAW frequency stabilization is realized by adopting the acoustic surface resonator, and the frequency stability is extremely high.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the intelligent gas stove is used for sensing flame of the cooking bench, when a passive temperature sensor senses the temperature of the flame, the heat energy of the flame is converted into electric energy, and a centralized processing device is informed to carry out logic analysis, so that a user does not need to connect any cable in the process, and the cable is damaged due to overhigh temperature;

2. when the current temperature is more than or equal to 400 ℃, the passive temperature sensor starts to start; when the temperature is continuously more than or equal to 400 ℃ for 30 seconds, the passive temperature sensor intermittently sends out a starting signal.

Drawings

FIG. 1 is a functional block diagram of an embodiment of the present application;

fig. 2 is a circuit diagram of an embodiment of the present application.

Reference numerals: 1. a thermocouple; 2. an aerial connector; 3. a high efficiency converter; 4. an energy storage and processing circuit; 5. a wireless transmitter; 6. an energy storage display circuit.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses a passive temperature sensor. Referring to fig. 1, a passive temperature sensor comprises a thermocouple 1, an aeronautical connector 2, a high efficiency converter 3, energy storage and processing circuitry 4 and a wireless transmitter 5.

The thermocouple 1 is used for sensing the temperature of a flame zone of a high-temperature device and converting a detected temperature signal into a thermoelectromotive force signal. The thermocouple is a passive sensor, does not need an external power supply during measurement, is very convenient to use, and is often used for measuring the temperature of gas or liquid in a furnace or a pipeline and the surface temperature of solid. The thermocouple is a commonly used temperature measuring element in a temperature measuring instrument, directly measures temperature, converts a temperature signal into a thermal electromotive force signal, and converts the thermal electromotive force signal into the temperature of a measured medium through an electric instrument (a secondary instrument).

The aeronautical connector 2 is used to connect the thermocouple 1 and the high-efficiency converter 3 for signal transmission therebetween. An aviation connector, called an aviation plug for short, is an electromechanical element for connecting an electrical line, so that its own electrical parameters are the first to be considered for selecting an aviation plug. Proper selection and use of an aerial plug is an important aspect of ensuring circuit reliability.

The high-efficiency converter 3 is used for carrying out 1: converting the signal with high magnification of 100 proportions and forming a first electric signal, wherein the first electric signal is a signal obtained by amplifying a thermoelectromotive force signal by 100 times; since the value of the thermoelectromotive force signal generated by the thermocouple 1 is minute, the thermoelectromotive force signal is amplified by 100 times by the high-efficiency converter 3, which is convenient for later data calculation and analysis.

The energy storage and processing circuit 4 is arranged to receive the first electrical signal and store energy and logically analyse the data to form a second trigger signal. Among other things, the energy storage and processing circuitry 4 includes the LTC31081 processing chip and its peripheral circuitry and energy storage display circuitry 6. LTC31081 is a highly integrated DC/DC converter well suited for collecting and managing the remaining energy from very low input voltage power supplies such as TEGs (thermoelectric generators), thermopiles and small solar cells. The boost topology adopted by the device can normally operate under the condition that the input voltage is as low as 20 mV. LTC31081 is capable of outputting 2.35v, 3.3v, 4.1v, 5v, etc.; the selectable low dropout linear regulator is 3mA-2, and when in output: logic control output, reserve energy output.

The energy storage display circuit includes a plurality of series connected light emitting diodes having their positive poles electrically connected to an external power source, their negative poles electrically connected to the 12-pin VOUT2 _ EN of the LTC31081 chip, and their negative poles connected to ground through a protection resistor R. The plurality of light emitting diodes are used for displaying the working state of the chip. The capacitor C is connected in parallel to both ends of the protection resistor R. The capacitor C functions as a filter.

In a working state, when the current temperature is more than or equal to 400 ℃, the energy collection of the passive temperature sensor is started, and the energy source after being amplified by 100 is collected for energy storage; when the temperature is continuously more than or equal to 400 ℃ for 30 seconds, the passive temperature sensor intermittently sends out a starting signal. The temperature of 400 ℃ is taken as a judgment reference, the detection is more accurate, and the starting signal is sent after the time delay of at least 30 seconds at 400 ℃. The interval 30S is a minimum guaranteed value, meaning that the energy collection 30S is sufficient once, which is a condition for data transmission, otherwise the energy is insufficient and insufficient to transmit data, so the transmission time can be extended as needed, but cannot be reduced.

And the wireless transmitter 5 adopts a 433 transmitter. And transmitting the second trigger signal to an external signal receiving end for wireless communication. The working frequency of a data transmitting module of the device is 315M, a sound meter resonator SAW is adopted for frequency stabilization, and the frequency stability is extremely high.

The implementation principle of the passive temperature sensor in the embodiment of the application is as follows: aiming at high-temperature equipment such as a cooking bench, the thermocouple 1 can be used for sensing flame of the high-temperature equipment such as the cooking bench, when the thermocouple 1 senses the flame temperature, heat energy of the thermocouple is converted into electric energy, the electric energy is logically analyzed through the high-efficiency converter 3 and the energy storage and processing circuit 4, and the damage of the cable caused by overhigh temperature due to the fact that a user is not required to connect any cable in the process.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A passive temperature sensor, characterized by: the device comprises a thermocouple (1), an aviation connector (2), a high-efficiency converter (3), an energy storage and processing circuit (4) and a wireless transmitter (5);

the thermocouple (1) is used for sensing the temperature of a flame area of high-temperature equipment and converting a detected temperature signal into a thermoelectromotive force signal;

the aviation connector (2) is used for connecting the thermocouple (1) and the high-efficiency converter (3) and is used for transmitting signals;

the high-efficiency converter (3) is used for converting the thermoelectromotive force signal at a high multiplying power and forming a first electric signal;

the energy storage and processing circuit (4) is used for receiving the first electric signal, storing energy and logically analyzing the data to form a second trigger signal;

the wireless transmitter (5) is used for wireless communication and transmitting the second trigger signal to an external signal receiving end.

2. A passive temperature sensor according to claim 1, wherein: the energy storage and processing circuit (4) comprises an LTC31081 processing chip and its peripheral circuits and energy storage display circuitry (6).

3. A passive temperature sensor according to claim 2, wherein: the high efficiency converter (3) is set to 1: 100, the first electrical signal is 100 times the thermal electromotive force signal.

4. A passive temperature sensor according to claim 3, wherein: when the current temperature is more than or equal to 400 ℃, the energy collection of the passive temperature sensor is started, and the energy source after being amplified by 100 ℃ is collected for energy storage; when the temperature is continuously more than or equal to 400 ℃ for 30 seconds, the passive temperature sensor intermittently sends out a starting signal.

5. A passive temperature sensor according to claim 2, wherein: the energy storage display circuit comprises a plurality of light emitting diodes which are connected in series, the positive electrodes of the plurality of light emitting diodes which are connected in series are electrically connected with an external power supply, the negative electrodes of the plurality of light emitting diodes are electrically connected with a 12 pin VOUT2 _ EN of the LTC31081 chip, and the negative electrodes of the plurality of light emitting diodes are grounded through a protective resistor R1.

6. A passive temperature sensor according to claim 5, wherein: and a capacitor C1 is connected in parallel to two ends of the protective resistor R1.

7. A passive temperature sensor according to claim 1, wherein: the wireless transmitter (5) is arranged as a 433 transmitter.