Ultrasonic oil smoke detector

Abstract

The invention discloses an ultrasonic oil smoke detector which comprises a support, an ultrasonic transmitter, an ultrasonic receiver and a main board, wherein the ultrasonic transmitter, the ultrasonic receiver and the main board are installed on the support. The ultrasonic transmitter faces the ultrasonic receiver; the mainboard comprises a power interface, a main control chip connected with the power interface, and a clock circuit and an operational amplifier circuit which are electrically connected with the main control chip; the ultrasonic transmitter is electrically connected with the main control chip, the ultrasonic receiver is connected with the input end of the operational amplifier circuit, and the output end of the operational amplifier circuit is electrically connected with the main control chip. According to the invention, the use of devices such as a temperature sensor and a pressure sensor which are greatly influenced by conditions such as temperature and humidity can be avoided, and the accuracy and sensitivity of the gas detector are improved by directly utilizing the characteristic that ultrasonic waves are not influenced by temperature and humidity.

Description

Technical Field

[0001] The invention relates to the technical field of gas detection, and in particular to an ultrasonic oil smoke detector. Background Art

[0002] The oil fume sensor is used to detect the concentration of oil fume in the air, but the oil fume concentration is affected by temperature, humidity and pressure. Therefore, it is necessary to set up a temperature sensor to collect temperature data, a humidity sensor to collect humidity data, and a pressure sensor to collect pressure data; and then use these data to determine the presence and concentration of oil fume through the microcontroller software algorithm. The disadvantage of the existing solution is that the temperature sensor and pressure sensor used in the hardware to collect gas temperature and pressure data will be greatly affected in high temperature or high humidity environments, thereby affecting the accuracy and sensitivity of gas detection of oil fume concentration.

[0003] Therefore, the prior art has defects and needs to be improved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an ultrasonic oil fume detector, avoid using devices such as temperature sensors and pressure sensors that are greatly affected by conditions such as temperature and humidity, and improve the accuracy and sensitivity of the gas detector.

[0005] The technical solution of the present invention is as follows: an ultrasonic fume detector is provided, comprising: a bracket, an ultrasonic transmitter, an ultrasonic receiver, and a mainboard respectively mounted on the bracket; the ultrasonic transmitter faces the ultrasonic receiver; the mainboard comprises: a power interface, a main control chip connected to the power interface, a clock circuit electrically connected to the main control chip, and an operational amplifier circuit; the ultrasonic transmitter is electrically connected to the main control chip, the ultrasonic receiver is connected to the input end of the operational amplifier circuit, and the output end of the operational amplifier circuit is electrically connected to the main control chip. The main control chip is used to control various electronic components, the power interface is used to connect to an external power supply to obtain power supply, the clock circuit is used to provide clock data to the main control chip, and the operational amplifier circuit is used to amplify and process the ultrasonic signal received by the ultrasonic receiver, so as to facilitate input to the main control chip for processing.

[0006] The ultrasonic transmitter sends out ultrasonic signals, which propagate in the air, and the ultrasonic receiver receives the scattered ultrasonic signals. When these ultrasonic signals encounter gas molecules, scattering occurs. The scattering intensity is proportional to the concentration. The higher the gas concentration, the slower the ultrasonic propagation speed from the transmitter to the receiver. That is, in general, the higher the gas concentration, the slower the ultrasonic transmission and reception speed, and vice versa.

[0007] The ultrasonic fume detector of the present invention utilizes this characteristic, firstly measures the propagation time of the ultrasonic wave from the ultrasonic wave transmitter to the ultrasonic wave receiver in a normal clean air environment as a reference time base; then measures the propagation time of the ultrasonic wave from the transmitter to the receiver in an air environment with oil smoke, and calculates the time difference between the two; and judges whether there is oil smoke in the air or the concentration of oil smoke according to the size of this time difference. Therefore, it avoids using devices such as temperature sensors and pressure sensors that are greatly affected by conditions such as temperature and humidity, and directly utilizes the characteristics of ultrasonic waves that are not affected by temperature and humidity, thereby improving the accuracy and sensitivity of the gas detector.

[0008] Furthermore, the ultrasonic oil fume detector further includes: a data output interface electrically connected to the main control chip.

[0009] Furthermore, the bracket includes: an installation box, a transmitter box and a receiver box respectively connected to the installation box; the mainboard is installed in the installation box, the ultrasonic transmitter is installed on the transmitter box, and the ultrasonic receiver is installed on the receiver box; the transmitter box is opposite to the receiver box.

[0010] Furthermore, the installation box comprises: a box body provided with an opening, and a cover plate sealing the opening.

[0011] Furthermore, the operational amplifier circuit adopts LM324 chip. The main control chip adopts FT60F022.

[0012] By adopting the above scheme, the present invention provides an ultrasonic oil smoke detector, which has the following technical effects:

[0013] 1. Taking advantage of the fact that ultrasound is not affected by temperature and humidity, the time difference method of ultrasonic propagation speed in air of different concentrations is directly used to detect the presence or concentration of oil smoke in the air, avoiding the influence of factors such as temperature and humidity, and improving the accuracy and sensitivity of gas detectors.

[0014] 2. Only the time difference of the propagation speed of ultrasound in air of different concentrations is used. Compared with the existing solution that needs to use multiple data such as ambient temperature, humidity, air pressure, etc. to calculate the detection results, this solution simplifies the algorithm of the microcontroller, avoids the errors caused by multiple calculations in the algorithm, and improves the accuracy and sensitivity of the gas detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0016] Figure 2 for Figure 1 An exploded view of an embodiment;

[0017] Figure 3 for Figure 1 Circuit schematic diagram of the main control chip, ultrasonic transmitter and power interface of the embodiment;

[0018] Figure 4 is the circuit schematic diagram of the clock circuit;

[0019] Figure 5 This is the circuit schematic diagram of the operational amplifier circuit and the ultrasonic receiver;

[0020] Figure 6 This is the circuit connection diagram of the data output interface. DETAILED DESCRIPTION

[0021] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] See also Figure 1-Figure 6 This embodiment provides an ultrasonic fume detector, comprising: a bracket, an ultrasonic transmitter 10, an ultrasonic receiver 11, and a main board 12 respectively mounted on the bracket; the ultrasonic transmitter 10 faces the ultrasonic receiver 11; the main board 12 comprises: a power interface 13, a main control chip 14 connected to the power interface 13, a clock circuit 15 electrically connected to the main control chip 14, and an operational amplifier circuit 16; the ultrasonic transmitter 10 is electrically connected to the main control chip 14, the ultrasonic receiver 11 is connected to the input end of the operational amplifier circuit 16, and the output end of the operational amplifier circuit 16 is electrically connected to the main control chip 14. The main control chip 14 is used to control various electronic components, the power interface 13 is used to connect to an external power supply to obtain power supply, the clock circuit 15 is used to provide clock data to the main control chip 14, and the operational amplifier circuit 16 is used to amplify and process the ultrasonic signal received by the ultrasonic receiver 11, so as to facilitate input to the main control chip 14 for processing.

[0023] The ultrasonic transmitter 10 emits an ultrasonic signal, which propagates in the air, and the ultrasonic receiver 11 receives the scattered ultrasonic signals. When these ultrasonic signals encounter gas molecules, scattering occurs, and the scattering intensity is proportional to the concentration. The higher the gas concentration, the slower the speed of ultrasonic propagation from the transmitter to the receiver. That is, under normal circumstances, the higher the gas concentration, the slower the ultrasonic transmission and reception speed, and vice versa.

[0024] The ultrasonic fume detector of the present invention utilizes this characteristic, firstly measures the propagation time of the ultrasonic wave from the ultrasonic transmitter 10 to the ultrasonic receiver 11 in a normal clean air environment as a reference time base; then measures the propagation time of the ultrasonic wave from the transmitter to the receiver in an air environment with oil smoke, and calculates the time difference between the two; and judges whether there is oil smoke in the air or the concentration of oil smoke according to the size of this time difference. Therefore, it avoids using devices such as temperature sensors and pressure sensors that are greatly affected by conditions such as temperature and humidity, and directly utilizes the characteristics of ultrasonic waves that are not affected by temperature and humidity, thereby improving the accuracy and sensitivity of the gas detector.

[0025] In this embodiment, the ultrasonic oil smoke detector further includes: a data output interface 17 electrically connected to the main control chip 14 .

[0026] In this embodiment, the bracket includes: a mounting box, a transmitter box 18 and a receiver box 19 respectively connected to the mounting box; the mainboard 12 is installed in the mounting box, the ultrasonic transmitter 10 is installed on the transmitter box 18, and the ultrasonic receiver 11 is installed on the receiver box 19; the transmitter box 18 is opposite to the receiver box 19.

[0027] In this embodiment, the installation box includes: a box body 20 provided with an opening, and a cover plate 21 covering the opening.

[0028] In this embodiment, the operational amplifier circuit 16 uses an LM324 chip, and the main control chip 14 uses an FT60F022 chip.

[0029] In summary, the present invention provides an ultrasonic oil smoke detector, which has the following technical effects:

[0030] 1. Taking advantage of the fact that ultrasound is not affected by temperature and humidity, the time difference method of ultrasonic propagation speed in air of different concentrations is directly used to detect the presence or concentration of oil smoke in the air, avoiding the influence of factors such as temperature and humidity, and improving the accuracy and sensitivity of gas detectors.

[0031] 2. Only the time difference of the propagation speed of ultrasound in air of different concentrations is used. Compared with the existing solution that needs to use multiple data such as ambient temperature, humidity, air pressure, etc. to calculate the detection results, this solution simplifies the algorithm of the microcontroller, avoids the errors caused by multiple calculations in the algorithm, and improves the accuracy and sensitivity of the gas detector.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An ultrasonic oil smoke detector, characterized in that: include: A bracket, an ultrasonic transmitter, an ultrasonic receiver, and a mainboard respectively mounted on the bracket; The ultrasonic transmitter faces the ultrasonic receiver; the main board includes: a power interface, a main control chip connected to the power interface, a clock circuit electrically connected to the main control chip, and an operational amplifier circuit; the ultrasonic transmitter is electrically connected to the main control chip, the ultrasonic receiver is connected to the input end of the operational amplifier circuit, and the output end of the operational amplifier circuit is electrically connected to the main control chip.

2. The ultrasonic fume detector according to claim 1, characterized in that: Also includes: A data output interface electrically connected to the main control chip.

3. The ultrasonic fume detector according to claim 1, characterized in that: The bracket includes: an installation box, a transmitter box and a receiver box respectively connected to the installation box; the mainboard is installed in the installation box, the ultrasonic transmitter is installed on the transmitter box, and the ultrasonic receiver is installed on the receiver box; the transmitter box is opposite to the receiver box.

4. The ultrasonic fume detector according to claim 3, characterized in that: The installation box comprises: a box body provided with an opening, and a cover plate covering the opening.

5. The ultrasonic fume detector according to claim 1, characterized in that: The operational amplifier circuit adopts LM324 chip.

6. The ultrasonic fume detector according to claim 1, characterized in that: The main control chip adopts FT60F022.

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