TWM558350U - Gas detecting device - Google Patents

Abstract

A gas detecting device for detecting a concentration of suspended particles in the air, comprising a gas transfer actuator; a photo sensor corresponding to a position below the gas transfer actuator; and a laser module disposed at the gas transfer actuation Between the device and the light sensor, the laser module can emit a light beam onto the light sensor; thereby, the gas is irradiated by the light beam, and the size of the suspended particles in the gas is analyzed by the light sensor, and is calculated. The concentration of the suspended particles is such that the gas is ejected at a high speed by the gas transfer actuator to spray and clean the surface of the photosensor to maintain the accuracy of each monitoring of the photosensor.

Description

Gas detection device

The present invention relates to a gas detecting device, and more particularly to a gas detecting device capable of automatically performing jet cleaning on a photosensor thereof.

In recent years, the air pollution problem in China and its neighboring areas has become more and more serious. Especially the concentration data of fine aerosols (PM 2.5) is often too high. The monitoring of the concentration of airborne particles has been paid more and more attention. Various detection devices have also become new. At present, the gas detection device for detecting the concentration of suspended particles on the market works by scattering the suspended particles of the gas in the air passage by the beam of infrared light or laser light, and detecting and collecting the scattered light. The particle size of the suspended particles and the number of suspended particles of different particle sizes in the unit space can be calculated according to the Mie scattering theory.

However, since the gas detecting device has an air passage connecting the outside air, and the light sensor for detecting the scattered light is also disposed in the air passage, the pollutant from the outside is easily attached to the light sensor to affect the scattered light. The detection causes errors in the calculation results. In response to this problem, the current solution is to perform compensation calculation through software calculation. However, due to the fact that the suspended particles in the outside air tend to change with time instead of maintaining a fixed value, the corrected detection value is still often corrected. There is a certain deviation from the actual results. Therefore, for the gas detecting device for detecting the concentration of suspended particles, the problem that the photo sensor is easily shielded by the suspended particles from the outside is a problem that the industry urgently needs to solve.

The present invention provides a gas detecting device with an automatic cleaning function for detecting the concentration of suspended particles in the air, and automatically performing air jet cleaning on the photo sensor to prevent contaminants in the outside air from adhering to the photo sensor. In order to avoid deviations in the detection results.

In a generalized embodiment of the present invention, a gas detecting device for detecting a concentration of suspended particles contained in air includes: a gas transfer actuator; and a photo sensor corresponding to the gas transfer actuator a lower position; and a laser module disposed between the gas transmission actuator and the photo sensor, the laser module emitting a light beam projected onto the photo sensor; thereby, the gas By being irradiated by the light beam, the size of the suspended particles in the gas is analyzed by the photo sensor, and the concentration of the suspended particles is calculated, so that the gas is ejected at high speed by the gas transfer actuator to face the photosensor The aerosol is sprayed and cleaned to maintain the accuracy of each monitoring of the light sensor.

In a preferred embodiment of the present invention, a corresponding accommodating groove and a plurality of fixing grooves are disposed in the gas flow path corresponding to the air inlet; the gas transmission actuator is composed of a gas venting piece, a cavity frame, an actuator, and an insulation. The frame and a conductive frame are sequentially stacked, wherein the air vent sheet comprises a plurality of brackets, a suspension piece and a hollow hole, and the bracket has a fixing portion shaped to correspond to the shape of the fixing groove, so that the plurality of brackets can be sleeved The plurality of fixing grooves of the gas flow path are disposed to position the gas venting holes in the accommodating grooves. The connecting portion of the bracket elastically supports the suspension piece for allowing the suspension piece to perform reciprocating bending vibration.

Some exemplary embodiments embodying the features and advantages of the present invention are described in detail in the following description. It is to be understood that the present invention is capable of various modifications in various embodiments, and is not intended to limit the scope of the invention.

The present invention provides a gas detecting device for detecting the concentration of suspended particles contained in the air, and the suspended particles may be PM2.5 suspended particles or PM10 suspended particles. Please refer to FIG. 1 , which is a schematic structural view of a gas detecting device according to a preferred embodiment of the present invention. In the present embodiment, the gas detecting device 100 includes a gas transmission actuator 1, a laser module 2, a photo sensor 3, an optical mechanism 4, and a driving circuit module 5. The optical mechanism 4 is disposed between the gas transmission actuator 1 and the photo sensor 3 and is a solid member having a beam path 41 and a gas flow path 42 formed therein. Among them, the gas flow path 42 is preferably but not limited to a channel of a straight line configuration. The beam path 41 is a linear channel and is connected across the gas flow path 42. In the present embodiment, the gas flow path 42 and the beam path 41 are disposed perpendicular to each other. In this embodiment, the optical mechanism 4 further includes a light source setting groove 43 and a receiving groove 44. The light source setting groove 43 is disposed at one end of the beam path 41. The receiving groove 44 is disposed at one end of the gas flow path 42. One of a square, a circle, an ellipse, a triangle, and a polygon.

The gas transfer actuator 1 described above is constructed above the gas flow path 42 of the optical mechanism 4 for introducing the pilot gas flow. In the present embodiment, the gas transmission actuator 1 is fixed in the accommodating groove 44 of the optical mechanism 4, but is not limited thereto.

The laser module 2 is disposed in the light source setting groove 43 of the optical mechanism 4 for emitting a laser beam to illuminate the beam path 41 and to illuminate through the gas flow path 42. The photo sensor 3 is disposed in the gas flow path 42 and located below the beam path 41. When the laser beam emitted from the laser module 2 passes through the gas flow path 42, it is irradiated to the gas flowing through the gas flow path 42 between the gas transmission actuator 1 and the photo sensor 3.

The light sensor 3 is configured to detect a spot of light that is reflected by the suspended particles of the gas emitted from the laser beam emitted from the laser module 2, thereby detecting the inclusion in the air. The size of the suspended particles and the concentration of suspended particles are calculated.

Referring to FIG. 1 , the driving circuit module 5 includes a transmission module (not shown) and a processor (not shown). The processor controls the gas transmission actuator 1 , the laser module 2 and the light. The activation of the sensor 3 and the analysis and storage of the monitoring result of the photo sensor 3, when the processor controls the gas transmission actuator 1, the laser module 2 and the photo sensor 3, the gas transmission The actuator 1 guides the introduction of the gas flow into the gas flow passage 42. The gas in the gas flow passage 42 is irradiated by the light beam projected by the laser module 2 through the beam passage 5, so that the light sensor 3 detects The gas floating particles in the gas flow channel 42 are irradiated to refract the light spot, and the detection monitoring result is transmitted to the processor, and the processor analyzes the size of the suspended particles in the gas according to the detection result, and calculates the concentration of the suspended particles contained therein. According to the analysis, a monitoring value is generated for storage, and the monitoring value stored by the processor is sent by the transmission module to an external connection device (not shown), and the external connection device can be a cloud system, a portable device, a computer system, One of the display devices, etc. Display the monitoring value and the alarm indication.

During the detection of the gas detecting device described above or at a predetermined time point, the processor controls the activation of the gas transfer actuator 1 to drive the external gas into the gas transfer actuator 1 and is guided through the gas transfer actuator 1 at a high speed. The priming gas flows in the gas flow path 42, whereby the suspended particles adhered to the surface of the photo sensor 3 are ejected and cleaned, so that the accuracy of the photo sensor 3 is maintained normally. The preset time point may be before each air detecting operation, or a plurality of preset time points having a fixed time interval (for example, automatic cleaning every three minutes), or may be manually controlled by the user. It may be dynamically determined by the use of software based on the instantaneous monitoring of numerical calculations, and is not limited to the examples herein.

In addition, the above transmission module can be transmitted to an external device through wired transmission or wireless transmission, and the wired transmission mode is as follows, for example, a wired transmission module of one of USB, mini-USB, micro-USB, or the like, or the wireless transmission mode is as follows For example, a wireless transmission module such as a Wi-Fi module, a Bluetooth module, a radio frequency identification module, and a near field communication module.

Please refer to Fig. 2, Fig. 3A and Fig. 3B at the same time. Fig. 2 is a schematic view showing the structure of the gas transmission actuator fixed in the accommodating groove; Fig. 3A and Fig. 3B are respectively shown in Fig. 2. The related components of the gas transmission actuator are decomposed into a schematic diagram of the front structure and a schematic view of the back structure. The gas transfer actuator 1 of the present embodiment is a miniaturized gas transport structure that allows gas to be transported at high speed and in large quantities. The gas delivery actuator 1 of the present embodiment is sequentially stacked correspondingly by elements such as the air vent sheet 11, the cavity frame 12, the actuator 13, the insulating frame 14, and the conductive frame 15.

Please refer to FIG. 4, and FIG. 4 is a schematic diagram showing the appearance of the accommodating groove shown in FIG. The accommodating groove 44 further has a plurality of fixing grooves 441 for the venting fins 11 to be fastened thereto. The number of the fixing slots 441 of the embodiment is four, which are corresponding to the four corners of the receiving slot 44, and are L-shaped grooves, but not limited thereto, the number and the groove pattern may be based on actual conditions. Demand changes. A first groove 442 and a second groove 443 are defined in a side of the receiving groove 44.

Please refer to Figure 5 and refer to Figures 3A and 3B simultaneously. Fig. 5 is a schematic plan view showing the structure of the gas vent sheet shown in Fig. 3A. The air venting sheet 11 is made of a flexible material, and includes a suspension sheet 110, a hollow hole 111, and a plurality of brackets 112. The suspension piece 110 is a sheet-like structure that can be flexibly vibrated, and its shape and size substantially correspond to the inner edge of the receiving groove 44. However, the shape of the suspension piece 110 can also be square, circular, elliptical, triangular, and One of the polygons. The hollow hole 111 is disposed through the center of the suspension piece 110 for gas circulation. The number of the brackets 112 of the present embodiment is four, but not limited thereto. The number and type of the brackets 112 are mainly disposed opposite to the fixing slots 441, and each bracket 112 and the corresponding fixing slot 441 form a snap structure. They are locked and fixed to each other, but the implementation can be changed according to the actual situation.

For example, as shown in FIG. 4 and FIG. 5, each of the brackets 112 of the present embodiment includes a fixing portion 1121 and a connecting portion 1122, and the shape of the fixing portion 1121 and the fixing groove 441 (shown in FIG. 4) Correspondingly, they are all L-shaped to match each other; that is, the fixing portion 1121 is an L-shaped solid structure, and the fixing groove 441 is an L-shaped groove. When the fixing portion 1121 is sleeved in the fixing groove 441, the two can mutually The snaps are coupled to thereby accommodate the air venting fins 11 in the accommodating grooves 44. The buckle structure design can produce a positioning effect in the horizontal direction and enhance the connection strength between the air vent sheet 11 and the accommodating groove 44. Moreover, during the assembly process, the snap-fit structure allows the air venting aperture 11 to be quickly and accurately positioned in the accommodating slot 44, which is light and simple, easy to assemble, and easy to accurately position and assemble. At the same time, the connecting portion 1122 of the bracket 112 is connected between the suspension piece 110 and the fixing portion 1121, and has an elastic strip structure, so that the suspension piece 110 can be flexibly vibrated reciprocally. A plurality of brackets 112 define a plurality of voids 113 (as shown in FIG. 6A) between the suspension sheet 110 and the inner edge of the receiving groove 44 for gas circulation.

Please refer to FIG. 3A, FIG. 3B and FIG. 6A at the same time. FIG. 6A is a schematic cross-sectional view of the A-A of the gas transmission actuator shown in FIG. 2 . The cavity frame 12 can be square and carries the suspension sheet 110 stacked on the air vent sheet 11. The actuator 13 is stacked on the cavity frame 12 to cover the hollow structure, and a resonant cavity 16 is formed between the air ejection orifice 11, the cavity frame 12 and the actuator 13. The actuator 13 can be formed by a piezoelectric carrier 131, an adjustment resonator 132 and a piezoelectric sheet 133. The piezoelectric carrier 131 can be a metal plate, and a peripheral edge thereof can extend to form a first conductive pin 1311. Receive current. The adjustment resonator plate 132 can also be a metal plate and attached to the piezoelectric carrier plate 131. The piezoelectric sheet 133 is a plate made of a piezoelectric material, and is placed on the adjustment resonance plate 132. When the piezoelectric sheet 133 is energized, it is deformed by the piezoelectric effect, and the piezoelectric carrier 131 is driven to reciprocate in a range of a specific vibration frequency. The adjustment resonance plate 132 is located between the piezoelectric piece 133 and the piezoelectric carrier 131, and as a buffer between the two, the vibration frequency of the piezoelectric carrier 131 can be adjusted. Basically, the thickness of the adjustment resonance plate 132 is larger than the thickness of the piezoelectric carrier 131, and the thickness of the adjustment resonance plate 132 can be designed and selected, thereby adjusting the vibration frequency of the actuator 13.

Referring to FIG. 2, FIG. 3A and FIG. 3B , the insulating frame 14 and the conductive frame 15 are sequentially stacked on the actuator 13 , and a second conductive pin 151 is protruded from the outer edge of the conductive frame 15 , and A curved electrode 152 is protruded from the inner edge, and the electrode 152 is electrically connected to the piezoelectric piece 133 of the actuator 13. As shown in FIG. 2, the second conductive pin 151 of the conductive frame 15 and the first conductive pin 1311 of the piezoelectric carrier 131 respectively protrude from the second groove 443 and the first groove of the accommodating groove 44. 442, thereby turning on the current outward, and forming the piezoelectric carrier 131, the adjustment resonant plate 132, the piezoelectric sheet 133, and the conductive frame 15 into a common circuit. In addition, through the insulating frame 14 disposed between the conductive frame 15 and the piezoelectric carrier 131, direct electrical connection between the conductive frame 15 and the piezoelectric carrier 131 can be avoided, resulting in a short circuit.

Please refer to FIG. 6A, which is a schematic cross-sectional view of the AA cross section of the gas transmission actuator shown in FIG. 2, which shows that the gas transmission actuator 1 is assembled on the accommodating groove 44 and corresponds to the initial state of the gas flow path 42. . The gas venting sheet 11, the cavity frame 12, the actuator 13, the insulating frame 14, and the conductive frame 15 are sequentially stacked on the accommodating groove 44 to constitute the gas transfer actuator 1 of the present embodiment. In the preferred embodiment of the present invention, an air flow chamber 17 is formed between the air venting sheet 11 and the bottom surface of the accommodating groove 44. The air flow chamber 17 passes through the hollow hole 111 of the air venting piece 11, and communicates with the resonant chamber 16 between the actuator 13, the cavity frame 12 and the suspension piece 12. By controlling the vibration frequency of the gas in the resonance chamber 16 to be similar to the piezoelectric vibration frequency of the suspension piece 110, the Helmholtz resonance effect can be generated by the resonance chamber 16 and the suspension piece 110.俾 Increases gas transmission efficiency.

Please refer to FIG. 6A, FIG. 6B and FIG. 6C at the same time. FIG. 6B and FIG. 6C are diagrams showing the operation of the gas transmission actuator shown in FIG. 6A. As shown in FIG. 6B, when the piezoelectric sheet 133 vibrates upward, the suspension sheet 110 that drives the air-jet orifice sheet 11 vibrates upward, causing the volume of the airflow chamber 17 to rapidly expand, resulting in a drop in pressure in the airflow chamber 17. The negative pressure of the gas flow chamber 17 attracts the outside atmospheric gas to flow from the plurality of voids 113, and enters the resonant chamber 16 via the hollow holes 111, thereby increasing the gas pressure in the resonant chamber 16 to generate a pressure gradient. Next, as shown in FIG. 6C, when the piezoelectric sheet 133 causes the suspension sheet 110 of the gas venting sheet 11 to vibrate downward, the gas in the resonance chamber 16 quickly flows out through the hollow hole 111, and is squeezed into the airflow chamber 17. The air is allowed to eject quickly and in a large amount in a desired gas state close to the law of Cannulli, and is discharged after flowing through the photo sensor 3 (see Fig. 1). According to the principle of inertia, the internal pressure of the resonant chamber 16 after exhausting is lower than the equilibrium air pressure, and the gas is guided to enter the resonant chamber 16 again. Therefore, the piezoelectric sheet 133 reciprocally vibrates up and down, and the vibration frequency of the gas in the resonant chamber 16 and the piezoelectric sheet 133 are controlled to be similar to each other to generate a Helmholtz resonance effect, and the gas is high speed and A lot of transmission.

In summary, the gas detecting device provided with the automatic cleaning function of the present invention has a gas transmission actuator driven by the piezoelectric piece to vibrate up and down, which drives the resonance chamber to generate a pressure change, thereby achieving the effect of gas transmission, and by The light mechanism is provided to provide a beam path to concentrate the beam. Furthermore, in this case, the gas in the resonant chamber is closer to the resonance frequency of the piezoelectric sheet to generate the Helmholtz resonance effect, thereby further increasing the gas transmission rate and the amount of transmission, so that the gas is close to the Bainuoli. The ideal gas state of the law is quickly ejected toward the photo sensor, thereby removing the suspended particles attached to the surface of the photo sensor, thereby achieving the purpose of cleaning the photo sensor.

This case has been modified by people who are familiar with the technology, but it is not intended to be protected by the scope of the patent application.

100‧‧‧Gas detection device
1‧‧‧ gas transmission actuator
11‧‧‧Air hole film
110‧‧‧suspension tablets
111‧‧‧ hollow holes
112‧‧‧ bracket
1121‧‧‧ Fixed Department
1122‧‧‧Connecting Department
113‧‧‧ gap
12‧‧‧ cavity frame
13‧‧‧Actuator
131‧‧‧Piezo carrier
1311‧‧‧First conductive pin
132‧‧‧Adjusting the resonance plate
133‧‧‧ Piezo Pieces
14‧‧‧Insulation frame
15‧‧‧Electrical frame
151‧‧‧Second conductive pin
152‧‧‧electrode
16‧‧‧Resonance chamber
17‧‧‧Airflow chamber
2‧‧‧Laser module
3‧‧‧Light sensor
4‧‧‧Light institutions
41‧‧‧beam channel
42‧‧‧ gas flow path
43‧‧‧Light source setting slot
44‧‧‧ accommodating slots
441‧‧‧fixed slot
442‧‧‧first groove
443‧‧‧second groove
5‧‧‧Drive circuit module

1 is a schematic structural view of a gas detecting device according to a preferred embodiment of the present invention. FIG. 2 is a schematic view showing the appearance of the gas transmission actuator fixed in the accommodating groove of the present invention. Fig. 3A is a schematic exploded perspective view of the related components of the gas transmission actuator shown in Fig. 2. Fig. 3B is a schematic exploded perspective view of the related components of the gas transmission actuator shown in Fig. 2. Figure 4 is a schematic view showing the appearance of the accommodating groove of the present case. Fig. 5 is a schematic plan view showing the structure of the gas vent sheet shown in Fig. 3A. Fig. 6A is a schematic cross-sectional view showing the A-A of the gas transmission actuator shown in Fig. 2. Fig. 6B and Fig. 6C are diagrams showing the operation of the gas transfer actuator shown in Fig. 6A.

Claims (7)

A gas detecting device for detecting a concentration of suspended particles contained in the air comprises: a gas transmitting actuator; a light sensor correspondingly disposed below the gas transmitting actuator; and a laser module, Provided between the gas transmission actuator and the photo sensor, the laser module can emit a light beam projected onto the photo sensor; thereby, the gas is irradiated by the light beam, and the light is irradiated by the light beam The sensor analyzes the size of the suspended particles in the gas, and calculates the concentration of the suspended particles, so that the gas is ejected at a high speed by the gas transfer actuator, and the surface of the photosensor is adhered to the suspended particles for cleaning and cleaning to maintain The accuracy of the light sensor is monitored each time. The gas detecting device of claim 1, comprising an optical mechanism disposed between the gas transmitting actuator and the photo sensor, the optical mechanism having a gas flow path and a beam path, The light beam channel is connected to the gas flow channel, and the laser module is disposed on the light mechanism, and a light beam is emitted from the light beam channel and is irradiated through the gas flow channel, and the light sensor is disposed in the gas flow channel And located at a position below the beam path to detect a refracted spot generated by the beam emitted by the laser module to illuminate the gas in the gas channel, thereby monitoring and calculating the size of the suspended particles contained in the gas Suspended particle concentration. The gas detecting device of claim 2, wherein the optical mechanism is provided with a receiving groove, the receiving groove having a plurality of fixing grooves. The gas detecting device of claim 3, wherein the gas transmitting actuator comprises: a gas jet orifice piece comprising a plurality of brackets, a suspension piece and a hollow hole, the suspension piece being bendable and vibrating, the plural a plurality of brackets are disposed in the plurality of fixing slots to position the air venting apertures in the accommodating slots, and an airflow chamber is formed between the venting apertures and the bottom surface of the accommodating slots, and the plurality of brackets and Forming at least one gap between the suspension piece and the accommodating groove; a cavity frame stacked on the suspension piece; an actuator stacked on the frame of the cavity, applying a voltage to reciprocally bend Vibrating; an insulating frame stacked on the actuator; and a conductive frame disposed on the insulating frame; wherein a resonance is formed between the actuator, the cavity frame and the floating piece The chamber is driven by the actuator to drive the air vent to resonate, causing the suspension piece of the vent to vibrate and reciprocate to cause the gas to enter the air chamber through the at least one gap, and then re-arrange Out into the gas flow path. The gas detecting device of claim 4, wherein the plurality of brackets comprise a fixing portion and a connecting portion, wherein the fixing portion has a shape corresponding to the shape of the at least one fixing groove, the connecting portion is connected to Between the suspension piece and the fixing portion, the connecting portion elastically supports the suspension piece for the reciprocating bending vibration of the suspension piece. The gas detecting device of claim 4, wherein the actuator comprises: a piezoelectric carrier plate stacked on the cavity frame; an adjustment resonant plate, the carrier is stacked on the piezoelectric carrier And a piezoelectric sheet, which is stacked on the adjustment resonance plate, applies a voltage to drive the piezoelectric carrier, and adjusts the resonance plate to generate reciprocating bending vibration. The gas detecting device of claim 6, wherein the thickness of the adjusting resonator plate is greater than the thickness of the piezoelectric carrier.