CN204044112U - A kind of ultrasound wave oil smoke concentration sensor - Google Patents
A kind of ultrasound wave oil smoke concentration sensor Download PDFInfo
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- CN204044112U CN204044112U CN201420293002.XU CN201420293002U CN204044112U CN 204044112 U CN204044112 U CN 204044112U CN 201420293002 U CN201420293002 U CN 201420293002U CN 204044112 U CN204044112 U CN 204044112U
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
A kind of ultrasound wave oil smoke concentration sensor, mainly comprises: ultrasound wave transmitting terminal, ultrasound wave receiving end, pressure transducer, temperature sensor and connecting link; Ultrasound wave transmitting terminal and receiving end, mainly comprise: metal coating shell, screen layer, quieter material, multi-disc piezoelectric crystal plate in parallel, matching layer, hydrophobic oleophobic cover glass and catch net.The velocity of propagation of ultrasound wave in oil smoke reflects the size of oil smoke concentration, through pressure and temperature correction, cpu data process, can obtain oil smoke concentration accurately.The utility model is multi-disc piezoelectric crystal plate in parallel because ultrasound wave transmitting terminal and receiving end all adopt, and signal is amplified at double; The textural association of quieter material and ultrasonic matching layer makes remained shock greatly reduce, hydrophobic oleophobic glass ensure that sensor has oil resistant cigarette and adheres to the ability polluted, therefore the utility model can realize the on-line monitoring of oil smoke concentration, has advantage highly sensitive, that dependable performance, contamination resistance are strong, easy to maintenance.
Description
Technical Field
The utility model relates to an oil smoke consistency transmitter, in particular to ultrasonic wave oil smoke consistency transmitter.
Background
In recent years, with the continuous development and improvement of national economic level of China, the oil smoke pollution in the food industry becomes a big problem of urban environmental pollution, and statistical data shows that: in 2004, 1560 ten thousand tons of edible oil in China and 2000 ten thousand tons of edible oil in 2010, and a large amount of oil smoke generated in the cooking process of the edible oil is a main source for causing urban air pollution. The discharged air pollutants are mainly aerosol consisting of gas, liquid and solid phases, wherein the aerosol contains volatile matters of edible oil and food at high temperature, and products of aldehydes, ketones, alkanes, alkenes, polycyclic aromatic hydrocarbons and the like formed by oxidation, cracking and hydrolysis of the edible oil and the food, and the components are extremely complex. The particle size of the solid-phase particles of the tobacco juice is generally less than l0 mu m, the adhesiveness is strong, most of the particles are insoluble in water, and the polarity is small. With the research on the kitchen oil smoke in depth by various research institutions, the harm of the kitchen oil smoke to human bodies is more and more attracting people's extensive attention.
Along with the rapid development of the catering industry, the pollution of the oil smoke emission of the catering industry to the environment is caused, and the complaint that the oil smoke disturbs the residents also draws more and more attention, so that the new problem of environmental supervision is solved, and the enhancement of the supervision on the oil smoke emission of the catering industry is urgent. The oil smoke sampling and analyzing method specified in appendix A of dietary oil smoke emission standards (trial) in GB18483-2001 issued by the State environmental protection agency is field stainless steel metal filter cylinder sampling and laboratory infrared spectrophotometry analysis (national standard method for short). The national standard method samples need to be brought back to a laboratory for analysis, the monitoring period is long, the cost is high, the steps are complicated, the requirements on field testing conditions are high, often, law enforcement personnel come to the field, and the situation is that the 'kitchen' is changed in appearance and is difficult to obtain evidence, so that the requirements on oil fume supervision and inspection and field law enforcement monitoring in the catering industry are difficult to meet. In addition, due to the fact that the number of urban catering shops is large, the coverage area is wide, pollution sources are scattered, and sufficient manpower and material resources are difficult to supervise. Therefore need urgently need real-time, accurate acquisition oil smoke concentration and be applicable to the novel oil smoke monitoring devices of flue adverse circumstances, can conveniently insert environmental protection supervision network with data, really realize carrying out efficient supervision to oil smoke pollution fast response, purposefully, realize the transformation from people's air defense to technical defense, can improve the reaction rate and the efficiency of environmental protection supervision greatly. In addition, various existing technologies and means based on smoke monitoring cannot be suitable for smoke monitoring due to the fact that the various technologies and means cannot adapt to smoke pollution with high adhesion, and the problems of measurement errors caused by smoke adhesion and short service life of an instrument cannot be solved.
Disclosure of Invention
An object of the utility model is to provide a can effectively solve above-mentioned problem, can accurate on line acquire oil smoke concentration, antipollution, longe-lived, dependable performance, be applicable to the oil smoke consistency transmitter of flue adverse circumstances.
The technical scheme of the utility model as follows:
an ultrasonic wave oil smoke concentration sensor, its structure mainly includes: the device comprises an ultrasonic transmitting end 1a, an ultrasonic receiving end 1b, a pressure sensor 11, a temperature sensor 12, a connecting rod 9 and an open type oil smoke detection channel 10;
the ultrasonic wave transmitting terminal 1a includes: the outer ends of a metal protective shell 5 and a shell 5 far away from a detection channel 10 are connected with a shielding layer 6, one end of a silencing material 7 in the shell 5 is connected with the shielding layer 6, the other end of the silencing material 7 is connected with a matching layer 4, a plurality of piezoelectric crystal pieces 8 connected in parallel are embedded in the silencing material 7, the matching layer 4 is arranged at the outer end of each piezoelectric crystal piece 8, the outer end of each matching layer 4 is connected with hydrophobic and oleophobic protective glass 3, and a protective net 2 is arranged at the outer end of the hydrophobic and oleophobic protective glass 3;
the ultrasonic receiving terminal 1b includes: the detection device comprises a metal protective shell 5, a shielding layer 6 connected with one end of a detection channel 10 in the shell 5, a silencing material 7 in the shell 5, a matching layer 4, a plurality of piezoelectric crystal pieces 8 which are connected in parallel, a matching layer 4, hydrophobic and oleophobic protective glass 3 and a protective net 2, wherein one end of the shielding layer 6 is connected with the shielding layer 6, the other end of the silencing material 7 is connected with the matching layer 4, the silencing material 7 is embedded with the piezoelectric crystal pieces 8, the outer ends of the piezoelectric crystal pieces 8 are provided with the matching layer 4, the outer end of the matching layer 4 is connected with the hydrophobic and;
the connecting rod 9 connects the ultrasonic transmitting end 1a and the ultrasonic receiving end 1b into a whole, and an open type oil smoke detection channel 10 is arranged between the ultrasonic transmitting end 1a and the ultrasonic receiving end 1 b;
the further scheme is as follows: the protection net 2 is preferably in a cross shape;
the further scheme is as follows: the shielding layer 6, the silencing material 7, the piezoelectric crystal pieces 8 connected in parallel, the matching layer 4 and the hydrophobic and oleophobic protective glass 3 are all connected together by an adhesive;
the further scheme is as follows: the ultrasonic lampblack concentration sensor is characterized in that the plurality of piezoelectric crystal pieces 8 connected in parallel comprise 3-5 piezoelectric crystal pieces connected in parallel.
The further scheme is as follows: the preparation process of the hydrophobic and oleophobic protective glass comprises the following steps: 3mL of mixed solution of tetraethoxysilane and dimethyl diethoxy silane with the volume ratio of 2:1 is added into 60mL of absolute ethyl alcohol and stirred uniformly; then, as dimethyldiethoxysilane: adding fluorine-containing silane with the molar ratio of 17:3, and uniformly stirring to obtain a mixed silane solution; then dropwise adding 1.0-1.5 mL of concentrated ammonia water (25 wt%) into the mixed silane solution, stirring at room temperature for 1-2 h, and standing for aging for 48 h; before use, the mixture is diluted by absolute ethyl alcohol according to the volume ratio of 1:1 and is stirred uniformly to obtain fluorine-containing hybrid SiO2Nano coating liquid; clean glass is dipped into fluorine-containing hybrid SiO at a speed of 50mm/min2Standing in the nano coating solution for 15min, then uniformly pulling the coating film at a speed of 200mm/min, and drying the prepared film at 50 DEG CDrying in a drying oven for 1h, and then carrying out heat treatment at 110 ℃ for 1-2 h to obtain the hydrophobic and oleophobic protective glass; the fluorine-containing silane is preferably: 1H,1H,2H, 2H-perfluorodecyltrimethoxysilane (CF)3(CF2)7CH2CH2Si(OCH3)3) Or 1H,1H,2H, 2H-perfluorodecyltriethoxysilane (CF)3(CF2)7CH2CH2Si(OCH2CH3)3). For this preparation we have applied for additional patent.
The utility model discloses an oil smoke concentration detection principle does: the ultrasonic wave is a mechanical wave with vibration frequency higher than that of sound wave, is generated by vibration of the piezoelectric wafer under the excitation of voltage, and has the characteristics of high frequency, short wavelength, small diffraction phenomenon, good directivity, directional propagation and the like. The ultrasonic sensor is mainly composed of a piezoelectric wafer, and can transmit ultrasonic waves and receive the ultrasonic waves. Two important performance criteria for ultrasonic sensors are sensitivity and aftervibration. The sensitivity is the ratio of the variation of the output signal of the sensor to the variation of the input signal under the condition of steady-state operation, and the measurement accuracy can be improved by improving the sensitivity. The residual vibration is the time from the beginning to the stop of the vibration after the sensor receives a pulse signal, and the receiving end can not be started to receive the signal before the residual vibration disappears, so the residual vibration determines the effect of the short-distance measurement. The propagation speeds of the ultrasonic waves in different media are different, if the distance from the ultrasonic wave transmitting end to the ultrasonic wave receiving end is L, namely the length of the oil smoke measuring channel is L, the time for the ultrasonic wave transmitted by the ultrasonic wave transmitting end to reach the ultrasonic wave receiving end is LtThe propagation speed of the ultrasonic wave in the oil fume isV，
Then according to the calculation formula of the sound velocity:
wherein,gis the adiabatic index of the oil fume gas;Ris the gas molar constant;Tis the temperature in kelvin of the oil fume gas,is the average molecular weight of the fume gas.
And the following steps: propagation velocity of ultrasonic wave:
the following can be obtained:
the average molecular weight depends on the concentration of the oil smoke, and the function relation between the average molecular weight of the oil smoke and the concentration of the oil smoke can be obtained through the calibration of a national standard method, so that the ultrasonic sensor can monitor the concentration of the oil smoke in real time.
The utility model has the advantages that: the ultrasonic lampblack concentration sensor of the utility model adopts the plurality of piezoelectric crystal pieces connected in parallel, thereby greatly improving the sensitivity of the monitoring signal; in addition, the structure of the sound attenuation material and the ultrasonic matching layer can well reduce residual vibration, greatly shorten the length of a required oil smoke measuring channel, ensure the measuring accuracy, integrate the transmitting end and the receiving end, and have convenient installation, and the protection net can effectively protect the ultrasonic probe and avoid damage; the hydrophobic and oleophobic protective glass can effectively avoid the adhesion of oil smoke, and ensure the reliability of the measurement result and the stability of the performance of the instrument; the oil smoke pollution monitoring system can be monitored on line, data can be conveniently transmitted to an upper computer, an environment-friendly monitoring network is accessed, quick response to oil smoke pollution and efficient monitoring can be achieved purposefully, the conversion from civil air defense to technical air defense is achieved, and the response speed and the efficiency of environment-friendly monitoring can be greatly improved.
Drawings
Fig. 1 is a perspective view (horizontal placement, front view) of an ultrasonic lampblack concentration sensor according to an embodiment of the present invention.
Fig. 2 is a perspective view (vertical, front view) of the ultrasonic lampblack concentration sensor according to the embodiment of the present invention.
Fig. 3 is a schematic view of an ultrasonic lampblack concentration sensor according to an embodiment of the present invention.
Fig. 4 is a perspective view of the transmitting end of the ultrasonic lampblack concentration sensor according to the embodiment of the present invention.
Fig. 5 is a perspective view of the receiving end of the ultrasonic lampblack concentration sensor according to the embodiment of the present invention.
Fig. 6 is a three-dimensional cross-sectional view of the transmitting end of the ultrasonic lampblack concentration sensor according to the embodiment of the present invention.
Fig. 7 is a three-dimensional cross-sectional view of the receiving end of the ultrasonic lampblack concentration sensor according to the embodiment of the present invention.
Fig. 8 is a schematic view of a circuit for measuring an ultrasonic lampblack concentration sensor according to an embodiment of the present invention.
Detailed Description
The invention will be described in further detail with reference to the following detailed description and accompanying drawings: as shown in fig. 1, fig. 2 and fig. 3, an ultrasonic lampblack concentration sensor mainly comprises: the ultrasonic wave receiving device comprises an ultrasonic wave transmitting end 1a, an ultrasonic wave receiving end 1b, a pressure sensor 11, a temperature sensor 12 and a connecting rod 9; as shown in fig. 4 and 6, the ultrasonic transmitting end 1a mainly includes: the device comprises a metal protective shell 5, a shielding layer 6, a silencing material 7, a plurality of piezoelectric crystal pieces 8 connected in parallel, a matching layer 4, hydrophobic and oleophobic protective glass 3 and a protective net 2; the ultrasonic receiving end 1b, as shown in fig. 5 and 7, mainly includes: the device comprises a metal protective shell 5, a shielding layer 6, a silencing material 7, a plurality of piezoelectric crystal pieces 8 connected in parallel, a matching layer 4, hydrophobic and oleophobic protective glass 3 and a protective net 2; the connecting rod 9 connects the ultrasonic transmitting end 1a and the ultrasonic receiving end 1b into a whole, and an open type oil smoke detection channel 10 is arranged between the ultrasonic transmitting end 1a and the ultrasonic receiving end 1 b; the protection net 2 is preferably of a cross type; the shielding layer 6, the silencing material 7, the piezoelectric crystal pieces 8 connected in parallel, the matching layer 4 and the hydrophobic and oleophobic protective glass 3 are connected together by an adhesive; the plurality of piezoelectric crystal pieces 8 connected in parallel comprise 3-5 piezoelectric crystal pieces connected in parallel; as shown in fig. 8, the ultrasonic wave transmitting end 1a transmits an ultrasonic wave signal, the sound wave passes through the open type oil smoke detection channel 10 and is received by the ultrasonic wave receiving end 1b, the propagation speed of the ultrasonic wave reflects the oil smoke concentration, the CPU performs data processing by matching with the detection data of the pressure sensor 11 and the temperature sensor 12, the concentration of the detected oil smoke can be obtained, the CPU controls the work and data processing of the transmitting and receiving circuit, and the CPU can conveniently transmit the oil smoke concentration data to the upper computer to realize the online monitoring of the oil smoke concentration. Because ultrasonic wave transmitting terminal and receiving terminal all adopt parallelly connected multi-disc piezoelectric crystal piece for the signal is enlargied at double, and the structural grouping of amortization material and ultrasonic matching layer makes the aftershock reduce greatly, and hydrophobic oleophobic glass guarantees that the sensor has the ability of anti oil smoke adhesion pollution, so the utility model discloses an ultrasonic wave oil smoke consistency transmitter sensitivity is high, the dependable performance, and antipollution ability is strong, and it is convenient to maintain.
The unexplained portions related to the present invention are the same as those of the prior art.
The above is only the preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the spirit of the invention, and these modifications and decorations should be regarded as being within the protection scope of the invention.
Claims (4)
1. An ultrasonic wave oil smoke concentration sensor, its characterized in that structure mainly includes: the device comprises an ultrasonic transmitting end (1 a), an ultrasonic receiving end (1 b), a pressure sensor (11), a temperature sensor (12), a connecting rod (9) and an open type oil smoke detection channel (10);
the ultrasound emitting end (1 a) comprises: the detection device comprises a metal protection shell (5), wherein a shielding layer (6) is connected to the outermost end, far away from a detection channel (10), in the shell (5), one end of a silencing material (7) is connected with the shielding layer (6), the other end of the silencing material (7) is connected with a matching layer (4), a plurality of piezoelectric crystal pieces (8) which are connected in parallel are embedded in the silencing material (7), the matching layer (4) is arranged at the outer end of each piezoelectric crystal piece (8), the outer end of the matching layer (4) is connected with hydrophobic and oleophobic protection glass (3), and a protection net (2) is arranged at the outer end of the hydrophobic and oleophobic protection glass (3);
the ultrasonic receiving end (1 b) includes: the detection device comprises a metal protection shell (5) and a shielding layer (6) connected with one end of a detection channel (10) in the shell (5), wherein one end of a silencing material (7) in the shell (5) is connected with the shielding layer (6), the other end of the silencing material (7) is connected with a matching layer (4), a plurality of piezoelectric crystal pieces (8) connected in parallel are embedded in the silencing material (7), the matching layer (4) is arranged at the outer end of each piezoelectric crystal piece (8), the outer end of the matching layer (4) is connected with hydrophobic and oleophobic protection glass (3), and a protection net (2) is arranged at the outer end of the hydrophobic and oleophobic protection glass (3);
the connecting rod (9) connects the ultrasonic transmitting end (1 a) and the ultrasonic receiving end (1 b) into a whole, and an open type oil smoke detection channel (10) is arranged between the ultrasonic transmitting end (1 a) and the ultrasonic receiving end (1 b).
2. The ultrasonic lampblack concentration sensor according to claim 1, characterized in that: the protection net (2) is in a cross shape.
3. The ultrasonic lampblack concentration sensor according to claim 1, characterized in that: the shielding layer (6), the silencing material (7), the piezoelectric crystal pieces (8) connected in parallel, the matching layer (4) and the hydrophobic and oleophobic protective glass (3) are connected together by an adhesive.
4. The ultrasonic lampblack concentration sensor according to claim 1, characterized in that: the piezoelectric crystal pieces (8) connected in parallel comprise 3-5 piezoelectric crystal pieces connected in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420293002.XU CN204044112U (en) | 2014-06-04 | 2014-06-04 | A kind of ultrasound wave oil smoke concentration sensor |
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| CN201420293002.XU CN204044112U (en) | 2014-06-04 | 2014-06-04 | A kind of ultrasound wave oil smoke concentration sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104792862A (en) * | 2015-03-16 | 2015-07-22 | 芜湖美的厨卫电器制造有限公司 | Electric water heater, and method and apparatus for monitoring quality of water in internal container of electric water heater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104792862A (en) * | 2015-03-16 | 2015-07-22 | 芜湖美的厨卫电器制造有限公司 | Electric water heater, and method and apparatus for monitoring quality of water in internal container of electric water heater |
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