CN220040314U

CN220040314U - Malodorous gas monitoring device adopting MEMS-MOS gas sensor

Info

Publication number: CN220040314U
Application number: CN202321621809.7U
Authority: CN
Inventors: 李扬; 姜大海
Original assignee: Beijing Essentec Technology Co ltd
Current assignee: Beijing Essentec Technology Co ltd
Priority date: 2023-06-26
Filing date: 2023-06-26
Publication date: 2023-11-17
Anticipated expiration: 2033-06-26

Abstract

The utility model discloses a malodorous gas monitoring device adopting an MEMS-MOS gas sensor. The problems that the prior art has high cost, long time consumption, can not consider the range of detected gas types and the detection precision when carrying out malodorous gas monitoring are solved. The device includes sensor storehouse body, vacuum pump and sample gas air inlet, and exhaust outlet and the venthole of the sensor storehouse body are connected respectively to the pump export of vacuum pump and pump entry, and the main storehouse side is equipped with the recess that covers with the signal acquisition board, and the recess bottom corresponds the position of gas sensor both sides and is equipped with air intake and gas vent, and the inlet port communicates the air intake, and the venthole communicates the gas vent. The malodorous gas monitoring device has the advantages of high detection speed, high precision and wide application range.

Description

Malodorous gas monitoring device adopting MEMS-MOS gas sensor

Technical Field

The utility model relates to the technical field of gas monitoring, in particular to a malodorous gas monitoring device adopting an MEMS-MOS gas sensor.

Background

Malodorous gas is a kind of gas matter which stimulates olfactory organ to cause people to be unpleasant and destroy living environment, and is a sensory nuisance which pollutes environment and endangers human health, and the malodorous gas matter has the advantages of high activity, strong volatility, low olfactory threshold, short diffusion time, high instantaneous concentration and obvious sensory feeling. For the detection of malodorous gases, the manual sniffing method is long in time consumption, cannot distinguish single pollutants and cannot continuously detect, so that the malodorous gases need to be monitored by using corresponding instrument devices so as to take treatment measures in time.

The monitoring method commonly adopted at present is a mode of sampling gas and then analyzing the gas by an instrument. However, the common analytical instrument has high cost, long detection and analysis time and untimely information feedback. Chinese patent publication No. CN217332380U, publication No. 2022, publication No. 08 and publication No. 30, named "malodorous gas detection device" discloses a malodorous gas detection device, comprising a device box provided with an air inlet pipe, a gas sensor module, an air chamber and an air pump, which can realize the detection of malodorous gas in the environment within a certain range, however, the detection accuracy of the detection device provided by the utility model is insufficient, the detected gas types and combinations are insufficient, and the application range is not wide.

Disclosure of Invention

The utility model solves the problems of high cost, long time consumption, incapability of considering the detection gas type range and the detection precision and the like in the process of carrying out malodorous gas monitoring in the prior art, and provides the malodorous gas monitoring device adopting the MEMS-MOS gas sensor, and the rapid and high-precision detection of various components of malodorous gas is realized through the high-efficiency wind sweeping detection structure of the gas detection bin.

In order to achieve the above purpose, the present utility model adopts the following scheme:

the utility model provides an adopt MEMS-MOS gas sensor's foul gas monitoring devices, includes the sensor storehouse body, vacuum pump and sample gas inlet, the inlet port at the sensor storehouse body is connected through the solenoid valve to the sample gas inlet, and waste gas outlet and the venthole of the sensor storehouse body are connected respectively to the pump export of vacuum pump and pump entry, the sensor storehouse body is including installing gas sensor's signal acquisition board and the main storehouse of detachable connection with signal acquisition board, main storehouse side is equipped with the recess that covers with signal acquisition board, and the recess bottom corresponds the position of gas sensor both sides and is equipped with air intake and gas vent, air intake and gas vent are the column through-hole, and inlet port intercommunication air intake, gas vent intercommunication gas vent are followed the both sides of main storehouse to inside extension to the recess bottom.

Preferably, a wind shield is arranged at the bottom of the groove, a filtering hole and a plurality of pairs of vent holes with different sizes are arranged on the wind shield corresponding to the air inlet and the air outlet, a filter screen for filtering solid impurities is arranged in the filtering hole, a rotating shaft is vertically connected to the center of the wind shield, and the rotating shaft penetrates through the main bin and is fixedly connected with an external knob.

Preferably, the sensor bin body comprises a sensor single bin and a sensor array bin which are connected in cascade, a single high-sensitivity gas sensor is arranged in the sensor single bin, a sensor array is arranged in the sensor array bin, and the sensor array is composed of a plurality of gas sensors for detecting different gases.

Preferably, the air inlet and the air outlet in the sensor single bin are circular, and the air inlet and the air outlet in the sensor array bin are elliptical with the short axes on the same straight line.

Preferably, the electromagnetic valve is a three-way electromagnetic valve, and one interface of the three-way electromagnetic valve is connected with a zero gas inlet.

Preferably, a sealing ring is arranged at the connection position of the main bin and the signal acquisition plate.

Preferably, the sensor housing is provided with a gas heating device.

Preferably, a fan for cooling the device is also included.

The utility model at least comprises the following beneficial effects: (1) The air inlet blows the gas to be detected to the gas sensor, and the sample gas blowing structure enables the gas to be in full contact with the gas sensor, so that the response speed and sensitivity of the gas sensor are improved, and the detection is faster and more accurate; (2) The detachable connection mode is adopted between the main bin and the signal acquisition board, so that the sensor element can be replaced conveniently; (3) The high-precision sensor single bin and the sensor array bin for combined detection of various gases are combined to realize high-efficiency, accurate and comprehensive gas detection; (4) The air inlet structure of the vacuum pump is adopted, and air directly enters the sensor bin body through the electromagnetic valve, so that the loss of the air passing through the vacuum pump is avoided; (5) The device has reasonable layout and compact structure, and can be selected and assembled with high efficiency.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of a sensor cartridge body;

FIG. 3 is a schematic diagram of a signal acquisition plate structure of a sensor unit cartridge;

FIG. 4 is a schematic diagram of a signal acquisition plate structure of a sensor array cartridge;

FIG. 5 is a schematic view of the main cartridge structure of the sensor unit cartridge;

FIG. 6 is a schematic diagram of the main cartridge structure of the sensor array cartridge;

fig. 7 is a schematic view of a wind deflector structure.

In the figure: the vacuum pump 1, a sample gas inlet 2, an electromagnetic valve 3, an air inlet hole 4, an exhaust gas outlet 5, an air outlet hole 6, a gas sensor 7, a signal acquisition plate 8, a main bin 9, a groove 10, an air inlet 11, an air outlet 12, a wind shield 13, a filter hole 14, a vent hole 15, a rotating shaft 16, a knob 17, a sensor single bin 18, a sensor array bin 19, a zero gas inlet 20, a sealing ring 21 and a fan 22.

Detailed Description

The present utility model is described in further detail below with reference to the drawings to enable those skilled in the art to practice the utility model by referring to the description.

It will be understood that terms, such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the materials, unless otherwise specified, are all commercially available; in the description of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "disposed" are to be construed broadly, and may be fixedly connected, disposed, or detachably connected, disposed, or integrally connected, disposed, for example. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. The terms "transverse," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used for convenience in describing and simplifying the description of the present utility model based on the orientation or positional relationship shown in the drawings, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present utility model.

As shown in fig. 1, the malodorous gas monitoring device adopting the MEMS-MOS gas sensor provided by the utility model comprises a sensor bin body, a vacuum pump 1 and a sample gas inlet 2, wherein the sensor bin body is used as a main detection unit of the monitoring device, a gas sensor 7 is arranged in the sensor bin body, the gas sensor 7 detects corresponding gas components in a working state to generate an electric signal, and the concentration of the corresponding gas can be judged according to the intensity of the electric signal; the sample gas inlet 2 is connected with the gas inlet 4 of the sensor bin body through the electromagnetic valve 3, the sample gas inlet 2 is used as an input port of sample gas to be detected, and can also be used as an input port of zero gas during device initialization, wherein the zero gas refers to nitrogen or pure air without gas components measured by the gas sensor 7; the pump outlet and the pump inlet of the vacuum pump 1 are respectively connected with the waste gas outlet 5 and the air outlet 6 of the sensor bin body, when the vacuum pump 1 operates, vacuumizing makes gas enter the device and flow in the device to finish detection, and the detected gas in the sensor bin body is transported to the waste gas outlet 5 to be discharged; the sensor bin body comprises a signal acquisition board 8 provided with a gas sensor 7 and a main bin 9 detachably connected with the signal acquisition board 8, the gas sensor 7 is arranged on the signal acquisition board 8 in an embedded or welded mode, a signal acquisition circuit is arranged on the signal acquisition board 8, the signal acquisition board 8 acquires and sorts electric signals generated by the gas detected by the gas sensor 7 and transmits the electric signals to matched data processing equipment and data storage equipment, and the signal acquisition board 8 and the main bin 9 are provided with corresponding screw holes which are screwed and fixed through bolts; the side of the main bin 9 is provided with a groove 10 covered by the signal acquisition plate 8, the position of the bottom of the groove 10 corresponding to the two sides of the gas sensor 7 is provided with an air inlet 11 and an air outlet 12, the air inlet 11 and the air outlet 12 are columnar through holes, the air inlet 4 and the air outlet 6 extend inwards from the two sides of the main bin 9 to the bottom of the groove 10, the air inlet 4 and the air outlet 6 are not directly communicated but are communicated through the groove 10, the air inlet 4 is communicated with the air inlet 11, the air outlet 6 is communicated with the air outlet 12, the air inlet 11 and the air outlet 12 face the two sides of the gas sensor 7 respectively and are used for changing the flow direction of gas flowing into the groove 10, and the gas is directly blown to the surface of the gas sensor 7 when flowing into the groove 10 from the air inlet 11 and is discharged from the air outlet 12.

Before malodorous gas detection is carried out, in order to obtain more accurate detection data, the device is initialized, the electromagnetic valve 3 and the vacuum pump 1 are opened, zero gas is input into the sample gas inlet 2, the zero gas passes through the whole detection circuit, the detection result of the detection is used as a reference to set the detection value of the device to zero, and the initialized device can be continuously used for a plurality of times and then is initialized; in the detection of malodorous gas, the electromagnetic valve 3 and the vacuum pump 1 are opened, the sample gas to be detected enters the air inlet 4 of the sensor bin body from the sample gas inlet 2, flows to the bottom of the groove 10 along the air inlet 4 and flows into the groove 10 from the air inlet 11, the gas is deflected to the other side of the gas sensor 7 in the process of blowing from the air inlet to the side face of the gas sensor 7 due to the suction of the air outlet 12, the deflected gas is directly blown onto the gas sensor 7 and fully contacts with the surface of the gas sensor 7, the gas sensor 7 generates an electric signal by detecting the concentration of the corresponding malodorous gas component in the gas, the electric signal is transmitted to the signal acquisition board 8, the signal acquisition board 8 carries out processing on acquired detection data, and the detected gas is pumped out of the exhaust gas outlet 5.

The air inlet 11 blows the gas to be detected to the gas sensor 7, and the sample gas blowing structure enables the gas to be in full contact with the gas sensor 7, so that the response speed and sensitivity of the gas sensor 7 are improved, and the detection is faster and more accurate; the main bin 9 and the signal acquisition board 8 are detachably connected, so that the maintenance of the sensor bin body is facilitated, and the sensor element is replaced in time; by adopting the air inlet structure of the vacuum pump 1 for back suction, the air directly enters the sensor bin body through the electromagnetic valve 3, so that the loss of the air passing through the vacuum pump 1 is avoided; the device has reasonable layout and compact structure, and can be selected and assembled with high efficiency.

In another technical scheme, a wind guard 13 is arranged at the bottom of a groove 10, the wind guard 13 is attached to the bottom of the groove 10 and can rotate freely in the groove 10, a filtering hole 14 and a plurality of pairs of vent holes 15 with different sizes are formed in the wind guard 13 corresponding to the air inlet 11 and the air outlet 12, the filtering hole 14 is consistent with the air inlet 11 and the air outlet 12 in size, a filter screen for filtering solid impurities is arranged in the filtering hole 14, the filter screen carries out physical filtration on gas, the components of the gas are not influenced, the plurality of pairs of vent holes 15 are arranged from large to small, the largest pair of vent holes are identical to the air inlet 11 and the air outlet 12 in size, the center of the wind guard 13 is vertically connected with a rotating shaft 16, the wind guard 13 and the rotating shaft 16 are fixedly connected, the wind guard 13 rotates along with the rotating shaft 16 in the same direction and at the same angle, the rotating shaft 16 passes through the main bin 9 and is fixedly connected with an external knob 17, a through hole is formed in the center of the bottom of the groove 10, the rotating shaft 16 passes through the main bin 9 from the through hole, the end of the rotating shaft 16 is connected with the knob 17, a stop pointer is arranged on the knob 17, the stop pointer points to the outside the main bin 9 and stops the stop position mark according to the stop position mark, and the matched position mark of the wind guard 13 and the air inlet 12. The structural arrangement of the wind shield 13 improves the applicability of the sensor bin body, under the condition that the air environment is relatively bad, the obtained sample gas contains a large amount of solid impurities such as sand, stone, dust and the like, if the sample gas is not preprocessed, the solid impurities can influence the sensitivity of the gas sensor 7 in the detection process, the detection accuracy is reduced, the service life of the sensor bin body is shortened, at the moment, the solid impurities in the gas can be filtered out only by rotating the knob 17 to a gear using the filter hole 14 for air intake, and the malodorous gas in the air can be detected on site without additionally adding filter equipment; when it is desired to adjust the gas flow rate, different sized vents may be selected to control the flow of gas slowly or rapidly through the grooves 10 to achieve a balance of detection rate and detection accuracy.

In another technical scheme, the sensor bin body comprises a sensor single bin 18 and a sensor array bin 19 which are cascaded, a single high-sensitivity gas sensor 7 is arranged in the sensor single bin 18, and the sensor single bin 18 is small in design size due to the fact that the single gas sensor 7 is used, a small amount of gas to be detected can quickly fill the groove 10, the gas flows through the gas sensor 7 more smoothly, contact is more complete, and the sensor bin body is suitable for high-precision gas detection requirements; the sensor array bin 19 is internally provided with a sensor array, the sensor array is composed of a plurality of gas sensors 7 for detecting different gases, the types of the gas sensors 7 contained in each sensor array are combined according to the relevance among different malodorous gases, and the sensor array is suitable for the detection requirements of overall detection of the gases or relatively low detection precision requirements; the air inlet 11 and the air outlet 12 in the sensor single bin 18 are circular, the circular air inlet 11 can enable air to uniformly and intensively flow through the air sensor 7, the air inlet 11 and the air outlet 12 in the sensor array bin 19 are elliptical with short axes on the same straight line, the elliptical air inlet 11 can increase the wind sweeping area to fully cover the sensor array, and meanwhile, air flow cannot be dispersed to other directions. The sensor array bin 19 can realize the rapid detection of various related gases by combining different gas sensors 7, so that the use quantity and the occupied space of the sensor bin body are saved; for the gas components with high-precision detection requirements, the sensor monomer bin 18 is independently used for detection in a detection path, the air sweeping structure of the sensor monomer bin 18 enables the gas to be uniformly and intensively blown to the gas sensor 7, the sample gas is more fully contacted with the surface of the gas sensor 7, the single gas sensor 7 is used for avoiding mutual interference among the sensors, the sensor monomer bin 18 is small in size, and is beneficial to rapidly and completely exhausting other gases remained in the groove 10, and in the process of performing heating auxiliary detection, the small-volume bin can rapidly heat and maintain the gas at a higher temperature, so that the sensor monomer bin 18 can realize a high-precision detection effect; by using the sensor array bin 19 and the sensor single bin 18 in a matched mode, the comprehensive detection can be realized, and meanwhile, the targeted high-precision detection can be realized.

In another technical scheme, solenoid valve 3 is three-way solenoid valve, and an interface connection of three-way solenoid valve has zero gas air inlet 20, and the inlet port 4 of the sensor storehouse body passes through three-way solenoid valve optionally intercommunication sample gas air inlet 2 or zero gas air inlet 20, and the zero gas air inlet 20 that singly sets up can install zero gas storage device, conveniently carries out device initialization operation at any time, avoids the residual gas pollution zero gas in the sample gas air inlet 2 simultaneously, has guaranteed the effect of device initialization.

In another technical scheme, a sealing ring 21 is arranged at the connection position of the main bin 9 and the signal acquisition plate 8, and the sealing ring 21 is arranged around the groove 10 to prevent the air leakage phenomenon between the main bin 9 and the signal acquisition plate 8; the sensor bin body is provided with a gas heating device, the gas heating device heats the gas in the bin body, the activity of each substance in the gas is improved, and the detection sensitivity is improved; the device also comprises a fan 22 for cooling the device, a large amount of heat can be generated in the running process of the device, and the fan 22 can radiate heat in time to prevent heat accumulation from damaging the device.

The number of equipment and the scale of processing described herein are intended to simplify the description of the present utility model. Applications, modifications and variations of the present utility model will be readily apparent to those skilled in the art.

Although embodiments of the present utility model have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the utility model would be readily apparent to those skilled in the art, and accordingly, the utility model is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

Claims

1. Adopt MEMS-MOS gas sensor's foul gas monitoring devices, a serial communication port, including the sensor storehouse body, vacuum pump (1) and sample gas inlet (2), sample gas inlet (2) are connected at inlet port (4) of the sensor storehouse body through solenoid valve (3), and exhaust outlet (5) and venthole (6) of the sensor storehouse body are connected respectively to the pump export and the pump entry of vacuum pump (1), the sensor storehouse body is including installing signal acquisition board (8) of gas sensor (7) and the main storehouse (9) of detachable connection with signal acquisition board (8), main storehouse (9) side is equipped with recess (10) that cover with signal acquisition board (8), and the position that corresponds gas sensor (7) both sides in recess (10) bottom is equipped with air intake (11) and gas vent (12), air intake (11) and gas vent (12) are the column through-hole, and inlet port (4) and gas vent (6) extend to recess (10) bottom from the both sides inside of main storehouse (9), air intake (4) intercommunication (6) air intake (11) intercommunication.

2. The malodorous gas monitoring device adopting the MEMS-MOS gas sensor according to claim 1, wherein a wind shield (13) is arranged at the bottom of the groove (10), a filtering hole (14) and a plurality of pairs of vent holes (15) with different sizes are arranged on the wind shield (13) corresponding to the air inlet (11) and the air outlet (12), a filter screen for filtering solid impurities is arranged in the filtering hole (14), a rotating shaft (16) is vertically connected to the center of the wind shield (13), and the rotating shaft (16) penetrates through the main bin (9) and is fixedly connected with an external knob (17).

3. The malodorous gas monitoring device adopting the MEMS-MOS gas sensor according to claim 1, characterized in that the sensor housing body comprises a sensor unit housing (18) and a sensor array housing (19) which are cascaded, a single high-sensitivity gas sensor (7) is arranged in the sensor unit housing (18), and a sensor array is arranged in the sensor array housing (19), and the sensor array is composed of a plurality of gas sensors (7) for detecting different gases.

4. A malodorous gas monitoring device using a MEMS-MOS gas sensor according to claim 3, characterized in that the air inlet (11) and the air outlet (12) in the sensor unit bin (18) are circular, and the air inlet (11) and the air outlet (12) in the sensor array bin (19) are elliptical with their minor axes on the same straight line.

5. The malodorous gas monitoring device using the MEMS-MOS gas sensor according to claim 1, wherein the electromagnetic valve (3) is a three-way electromagnetic valve, and a zero gas inlet (20) is connected to one interface of the three-way electromagnetic valve.

6. The malodorous gas monitoring device adopting the MEMS-MOS gas sensor according to claim 1, wherein a sealing ring (21) is arranged at the connection position of the main bin (9) and the signal acquisition board (8).

7. The malodorous gas monitoring device using a MEMS-MOS gas sensor according to claim 1, wherein the sensor housing is provided with a gas heating device.

8. The malodorous gas monitoring device employing a MEMS-MOS gas sensor according to claim 1, further comprising a fan (22) for cooling the device.