Ultrasonic oil smoke detector

Abstract

The utility model 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 respectively arranged 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 utility model, devices such as a temperature sensor and a pressure sensor which are greatly influenced by conditions such as temperature and humidity can be prevented from being used, 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] This utility model relates to the field of gas detection technology, and in particular to an ultrasonic oil fume detector. Background Technology

[0002] Oil fume sensors are used to detect the concentration of oil fumes in the air. However, the concentration of oil fumes is affected by temperature, humidity, and pressure. Therefore, a temperature sensor is needed to collect temperature data, a humidity sensor to collect humidity data, and a pressure sensor to collect pressure data. These data are then used by a microcontroller software algorithm to determine the presence and concentration of oil fumes. The drawback of existing solutions is that the temperature and pressure sensors used to collect gas temperature and pressure data suffer significant accuracy in high-temperature or high-humidity environments, thus affecting the accuracy and sensitivity of the oil fume concentration detection.

[0003] Therefore, existing technologies have shortcomings and need to be improved. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an ultrasonic fume detector that avoids the use of temperature sensors and pressure sensors, which are greatly affected by temperature and humidity conditions, thereby improving the accuracy and sensitivity of the gas detector.

[0005] The technical solution of this utility model is as follows: An ultrasonic fume detector is provided, comprising: a bracket, an ultrasonic transmitter, an ultrasonic receiver, and a main board 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 terminal of the operational amplifier circuit, and the output terminal 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 source to obtain power, the clock circuit is used to provide clock data to the main control chip, and the operational amplifier circuit is used to amplify the ultrasonic signal received by the ultrasonic receiver for convenient input to the main control chip for processing.

[0006] An ultrasonic transmitter emits ultrasonic signals, which propagate through the air. An ultrasonic receiver picks up these scattered ultrasonic signals. When these ultrasonic signals encounter gas molecules, scattering occurs. The scattering intensity is directly proportional to the concentration; the higher the gas concentration, the slower the ultrasonic waves travel from the transmitter to the receiver. In other words, generally, the higher the gas concentration, the slower the ultrasonic transmission and reception, and vice versa.

[0007] This invention's ultrasonic fume detector utilizes this characteristic. First, it measures the propagation time of ultrasound waves from the transmitter to the receiver in a normal, clean air environment as a reference time standard. Then, it measures the propagation time of ultrasound waves from the transmitter to the receiver in an air environment with oil fumes, calculating the time difference between the two. The magnitude of this time difference is used to determine the presence of oil fumes in the air, or the concentration of oil fumes. Therefore, it avoids using devices such as temperature and pressure sensors, which are significantly affected by temperature and humidity conditions, directly utilizing the characteristic of ultrasound waves being unaffected by temperature and humidity, thus improving the accuracy and sensitivity of the gas detector.

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

[0009] Furthermore, the bracket includes: a mounting box, a transmitter box and a receiver box respectively connected to the mounting box; the motherboard is installed inside the mounting box, the ultrasonic transmitter is installed on the transmitter box, and the ultrasonic receiver is installed on the receiver box; the transmitter box and the receiver box are opposite to each other.

[0010] Furthermore, the mounting box includes: a box body with an opening, and a cover plate that seals the opening.

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

[0012] By adopting the above solution, this utility model provides an ultrasonic fume detector, which has the following technical effects:

[0013] 1. Utilizing the characteristic that ultrasound is unaffected by temperature and humidity, the time difference method, which uses the different propagation speeds of ultrasound in air of different concentrations, can be used to detect the presence or concentration of oil fumes in the air. This avoids the influence of factors such as temperature and humidity, and improves the accuracy and sensitivity of gas detectors.

[0014] 2. This solution uses only the time difference between the propagation speeds of ultrasound in air of different concentrations. Compared to existing solutions that require calculations based on multiple data points such as ambient temperature, humidity, and air pressure, this solution simplifies the microcontroller's algorithm, avoids errors caused by multiple calculations in the algorithm, and improves the accuracy and sensitivity of the gas detector. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention;

[0016] Figure 2 for Figure 1 Exploded view of the embodiment;

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

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

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

[0020] Figure 6 This is the circuit connection diagram for the data output interface. Detailed Implementation

[0021] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Please see Figures 1-6 This embodiment provides an ultrasonic fume detector, including: a bracket, and 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 includes: 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 terminal of the operational amplifier circuit 16, and the output terminal 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 source to obtain power, 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 the ultrasonic signal received by the ultrasonic receiver 11 for input to the main control chip 14 for processing.

[0023] An ultrasonic transmitter 10 emits ultrasonic signals, which propagate through the air. An ultrasonic receiver 11 receives these 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 waves travel from the transmitter to the receiver. In other words, generally, the higher the gas concentration, the slower the ultrasonic wave transmission and reception, and vice versa.

[0024] This invention's ultrasonic fume detector utilizes this characteristic. First, it measures the propagation time of ultrasound waves from the transmitter 10 to the receiver 11 in a normal, clean air environment as a reference time standard. Then, it measures the propagation time of ultrasound waves from the transmitter to the receiver in an air environment with oil fumes, calculating the time difference between the two. The magnitude of this time difference is used to determine the presence of oil fumes in the air, or the concentration of oil fumes. Therefore, it avoids using devices such as temperature and pressure sensors, which are significantly affected by temperature and humidity conditions, directly utilizing the characteristic of ultrasound waves being unaffected by temperature and humidity, thus improving the accuracy and sensitivity of the gas detector.

[0025] In this embodiment, the ultrasonic fume 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 motherboard 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 and the receiver box 19 are opposite to each other.

[0027] In this embodiment, the mounting box includes: a box body 20 with an opening, and a cover plate 21 that seals the opening.

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

[0029] In summary, this utility model provides an ultrasonic fume detector, which has the following technical effects:

[0030] 1. Utilizing the characteristic that ultrasound is unaffected by temperature and humidity, the time difference method, which uses the different propagation speeds of ultrasound in air of different concentrations, can be used to detect the presence or concentration of oil fumes in the air. This avoids the influence of factors such as temperature and humidity, and improves the accuracy and sensitivity of gas detectors.

[0031] 2. This solution uses only the time difference between the propagation speeds of ultrasound in air of different concentrations. Compared to existing solutions that require calculations based on multiple data points such as ambient temperature, humidity, and air pressure, this solution simplifies the microcontroller's algorithm, avoids errors caused by multiple calculations in the algorithm, and improves the accuracy and sensitivity of the gas detector.

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

Claims

1. An ultrasonic oil fume detector, characterized by comprising: Include: Support, ultrasonic wave transmitter, ultrasonic wave receiver, mainboard mounted on the support respectively; The ultrasonic wave transmitter faces the ultrasonic wave receiver;The mainboard comprises: a power interface, a main control chip connected with the power interface, a clock circuit electrically connected with the main control chip, and an operational amplifier circuit;The ultrasonic wave transmitter is electrically connected with the main control chip, the ultrasonic wave 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; The support comprises: a mounting box, a transmitter box and a receiver box connected with the mounting box respectively;The mainboard is installed in the mounting box, the ultrasonic wave transmitter is installed on the transmitter box, and the ultrasonic wave receiver is installed on the receiver box;The transmitter box is opposite to the receiver box.

2. An ultrasonic oil mist detector according to claim 1, characterised in that Also include: A data output interface electrically connected with the main control chip.

3. The ultrasonic oil mist detector of claim 1, wherein, The mounting box comprises: a box body provided with an opening, and a cover plate covering the opening.

4. The ultrasonic oil mist detector of claim 1, wherein, The operational amplifier circuit adopts LM324 chip.

5. The ultrasonic oil mist detector of claim 1, wherein, The main control chip adopts FT60F022.

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