CN210198953U

CN210198953U - Device for detecting concentration of target gas in mixed gas

Info

Publication number: CN210198953U
Application number: CN201920826413.3U
Authority: CN
Inventors: Gaogang Lin; 林高刚; Xueren Wang; 王雪任; He Ma; 马赫; Guohao Ren; 任国豪; Huiguang Chen; 陈惠广
Original assignee: NINGBO SHUNYU INFRARED TECHNOLOGY Co Ltd
Current assignee: NINGBO SHUNYU INFRARED TECHNOLOGY Co Ltd
Priority date: 2019-06-03
Filing date: 2019-06-03
Publication date: 2020-03-27
Anticipated expiration: 2029-06-03

Abstract

The utility model relates to a device for detecting the concentration of target gas in mixed gas, which comprises a light source (1), a detector (2) and a light filtering mechanism (3), wherein the light filtering mechanism (3) is positioned between the light source (1) and the detector (2), and the detector (2) is positioned on the propagation path of the optical signal sent by the light source (1); the filtering mechanism (3) comprises a filter turntable (301) and a motor (302) for controlling the filter turntable (301) to rotate, the filtering mechanism (3) further comprises a target gas filter (303) arranged on the filter turntable (301), an interference gas filter (304) for detecting interference gas which causes interference to the target gas in the mixed gas and has a wave band with coincident absorption peaks with the target gas in a spectrum absorption area, and at least one reference filter (305) for providing fixed references for different detection environments. The utility model discloses a device of target gas concentration among the detection mist has sensitivity height, detects the characteristics that the precision is high.

Description

Device for detecting concentration of target gas in mixed gas

Technical Field

The utility model relates to a gaseous detection area especially relates to a device of target gas concentration among detection mist.

Background

With the continuous improvement of the gas alarm technology, more and more families have been installed and used, but the traditional alarm of the electrochemical mode has the defects of short service life, high false alarm rate and the like in use. Although the infrared gas detector has the advantages of difficult damage, high sensitivity, long service life and the like, the infrared detector adopting integrated multiple channels or adopting a plurality of sensors is expensive, and the performance of each channel of different detectors or the same detector is also inconsistent, so that the detection precision is reduced. The gas components or the concentration of the contained gas in the mixed gas are simply detected, so that the gas interference is not removed, and the detection result is inaccurate.

Disclosure of Invention

An object of the utility model is to solve above-mentioned problem, provide a device of target gas concentration among the detection mist.

In order to achieve the above object, the present invention provides a device for detecting a concentration of a target gas in a mixed gas, including a light source, a detector, and a filtering mechanism, wherein the filtering mechanism is located between the light source and the detector, and the detector is located on a propagation path of an optical signal emitted by the light source;

the filtering mechanism comprises a filter turntable and a driving device for controlling the filter turntable to rotate, and is characterized by also comprising a target gas filter arranged on the filter turntable, an interference gas filter for detecting interference gas with overlapped absorption bands of the target gas in a spectrum absorption area in mixed gas, and at least one reference filter for providing fixed reference for different detection environments;

the target gas optical filter, the interference gas optical filter and the reference optical filter can move to a transmission path of an optical signal emitted by the light source through the rotation of the optical filter turntable.

According to an aspect of the present invention, the target gas optical filter, the interference gas optical filter, and the reference optical filter are randomly arranged along the circumferential direction of the optical filter rotating disk, and the plane where the target gas optical filter, the interference gas optical filter, and the reference optical filter are located coincides with the rotation plane of the optical filter rotating disk;

according to an aspect of the utility model, filtering mechanism is still including setting up magnet on the light filter carousel and be used for the response thereby the magnet position is confirmed the hall sensor of light filter carousel reference position.

According to an aspect of the utility model, still including being used for the splendid attire the light source cover of light source, be provided with on the light source cover be used for with the light signal transmission that the light source sent extremely the first window piece of detector.

According to an aspect of the utility model, still including being used for the splendid attire the detector with the cover body of filtering mechanism, be provided with on the cover body with the detector with the second window piece that first window piece corresponds.

According to an aspect of the invention, the detector is a single channel detector.

According to the utility model discloses a scheme, because interference gas and target gas have coincident absorption peak in the spectrum absorption region, consequently, the interference gas in the mist of quilt survey can make the detector wrong to the content detection of target gas to send wrong alarm signal to the alarm, and the utility model discloses utilize the different principle of different gaseous wavelength, this problem can be solved to the target gas light filter that can detect different gases respectively and the interference gas light filter of setting. The interference gas optical filter can detect the concentration of different interference gases, thereby detecting the wave band interfering the target gas and fully reducing the probability of false alarm.

According to the utility model discloses a scheme, reference filter can provide fixed reference to different detection ring border to provide multichannel reference light path, change with the environment change with the reduction spectrum energy and detect the error that causes.

According to the utility model discloses a scheme, the utility model discloses a single channel detector uses as the detector, and cooperation filtering mechanism can make a detector of all light filters sharing to the passageway also has only one, thereby has eliminated among the prior art the mutual influence between the different passageways of same detector or between a plurality of detectors, has further improved the degree of accuracy that detects.

According to the utility model discloses a scheme, magnet and hall sensor among the filtering mechanism can set up zero point position as initial position to the turned angle that makes the motor can confirm follow-up every light filter according to the turned angle when zero point position makes the accurate removal of every light filter homoenergetic to between detector and the second window piece. And the zero point can be checked once every time the optical filter turntable rotates for one circle, so that the error caused by the structure can be eliminated.

Drawings

Fig. 1 is a structural view schematically showing an apparatus for detecting a concentration of a target gas in a mixed gas according to an embodiment of the present invention;

fig. 2 is a structural view schematically showing a filter mechanism according to an embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.

Fig. 1 is a schematic diagram showing an apparatus for detecting a concentration of a target gas in a mixed gas according to an embodiment of the present invention. As shown in fig. 1, the device for detecting the concentration of a target gas in a mixed gas of the present invention includes a light source 1, a detector 2, and a filter mechanism 3. Detector 2 sets up between light source 1 and filtering mechanism 3, and light source 1 is to detector 2's direction transmission light, and detector 2 receives the light through filtering mechanism 3 to realized the detection to target gas content, realized more accurate detection.

According to the utility model discloses an embodiment, light source 1 is the infrared light source, and its luminous end aims at detector 2, sends infrared light signal. The outer side of the light source 1 is provided with a light source cover 4 for containing the light source 1. The position of the light source cover 401 opposite to the emitting end of the light source 1 is provided with a first window piece 401 for transmitting the optical signal emitted by the light source 1 to the detector 2 and preventing the pollution of oil stains and the like.

According to the utility model discloses an embodiment, the utility model discloses a detector 2 is the single channel detector, is located the 3 left sides of filter mechanism in fig. 1, and light source 1 is aimed at to its receiving end to the light signal of receiving light source 1 transmission. The detector 2 and the filtering mechanism 3 are also provided with a cover body 5 outside for containing the detector 2 and the filtering mechanism 3. A second window piece 501 corresponding to the first window piece 401 is arranged at a position opposite to the receiving end of the detector 2 on the cover body 5, and the function of the second window piece is the same as that of the first window piece 401.

Fig. 2 is a structural view schematically showing a filter mechanism according to an embodiment of the present invention. Referring to fig. 1 and 2, according to an embodiment of the present invention, the filter mechanism 3 includes a filter turntable 301, a driving device 302, a target gas filter 303, and an interference gas filter 304. The filter turntable 301 is a circular flat plate, and is provided with six mounting holes along its circumference for mounting each filter, and a connection hole (not shown) connected to the driving device 302 at its center so as to be rotated by the driving device 302. In the present embodiment, the driving device may employ a motor. But may be any other device capable of driving the filter carousel 301 to rotate. The filter turntable 301 should be perpendicular to the propagation path of the optical signal emitted from the light source 1, and the mounting holes for mounting the filters thereon should be able to pass through the propagation path of the optical signal and correspondingly cooperate with the detector 2 with the rotation of the filter turntable 301. The driving device 302 is located on the left side of the filter carousel 301 in fig. 1, and its output end extends into a connection hole in the center of the filter carousel 301. According to the utility model discloses, the size of light filter carousel 301 can increase or reduce, and the mounting hole that is used for installing the light filter on it can increase or reduce, and it is can be decided according to particular case. Also, the target gas filter 303 and the interference gas filter 304 may be randomly arranged in the axial direction of the filter carousel 301.

Because interference gas and target gas have the absorption peak of coincidence in the spectrum absorption region, consequently, the interference gas in the mist of being surveyed can make detector 1 wrong to the content detection of target gas to send wrong alarm signal to the alarm, and the utility model discloses utilize the different principle of different gaseous wavelength, this problem can be solved to the target gas light filter 303 and the interference gas light filter 304 that can detect different gases respectively of setting. As shown in fig. 2, in the present embodiment, the target gas filter 303 and the interference gas filter 304 are mounted in respective mounting holes of the filter carousel 301, and the plane in which the target gas filter 303 and the interference gas filter 304 are located coincides with the rotation plane of the filter carousel 301. The interference gas filter 304 detects the concentration of the interference gas corresponding to the interference gas filter, so that the wave band interfering the target gas is detected, and the probability of false alarm is sufficiently reduced. According to an embodiment of the present invention, the target gas filter 303 of the present invention can detect methane (gas such as CO may be present), and the interference gas filter 304 can detect interference gas such as ethanol and acetic acid in the mixed gas.

In addition to interfering gases, spectral energy variations and environmental variations can also contribute to test errors. Therefore, as shown in fig. 2, the reference filter 305 capable of providing a fixed reference for different detection environments is added in the present embodiment, and the ratio of the detection results of the interference gas filter 304 and the reference filter 305 is calculated by calculating the ratio of the detection results of the target gas filter 303 and the reference filter 305, and if the value of the target gas filter 303 is a, the value of the interference gas filter 304 is C, and the value of the reference filter 305 is B, the values are calculated as a/B and C/B as described above. Since both equations have B, and the filtering performance of the reference filter 305 does not change with the environment, these 2B are identical, so that the influence caused by the change of the external light energy can be eliminated by B. The reference filter 305 can therefore also be used as a reference in the event of a change in the environment. Since the present embodiment is provided with 3 reference filters 305 and the reference filters 305 can be arbitrarily set at positions in the circumferential direction of the filter carousel 301, the positions of the reference filters 305, the target gas filters 303, and the interference gas filters 304 in the circumferential direction of the filter carousel 301 can be randomly set, as is clear from the above. And, the reference filter 305 can also move to the propagation path of the optical signal emitted by the light source 1 with the rotation of the filter turntable 301, and is used as a multi-path reference optical path, thereby effectively solving the above problems.

The filter mechanism 3 is matched with a single detector 1 serving as a single-channel detector, so that all the filters can share one detector, and only one channel is provided, thereby eliminating the mutual influence among different channels of the same detector or among a plurality of detectors in the prior art and further improving the detection accuracy.

In the above embodiment, with reference to fig. 1 and 2, the filter mechanism 3 may further include a magnet 306 and a hall sensor 307. The shape of the magnet 306 is not particularly limited in the present invention, but it should be disposed on the filter turntable 301, and the position can be set between two filters as shown in fig. 2. The hall sensor 307 is disposed on the left side of the filter mechanism 3 in fig. 1 at a height such that the magnet 306 can be detected by the filter carousel 301 following the rotation thereof, and is disposed as close as possible to the filter carousel 301 without affecting other devices, so as to improve the sensitivity of detection.

As set forth above, when the driving device 302 drives the filter turntable 301 to rotate under the control of the driving circuit, the magnet 306 can pass through and be detected by the detecting end of the hall sensor 307, and the position of the device is taken as the zero point. The zero point is used to determine a starting position, and the driving circuit can determine the angle at which the driving device 302 should drive the filter turntable 301 to rotate according to the zero point. From the zero point, the driving device 302 drives the optical filter rotating disc 301 to rotate by a fixed angle, so that the target gas optical filter 303 rotates to a position between the detector 1 and the second window piece 501, and thus the concentration of the target gas (namely, methane gas) is detected, and since the angle difference between each optical filter is the same, the driving device 302 only needs to rotate clockwise by the same angle according to the previous position, so that the subsequent optical filters can move to a position between the detector 1 and the second window piece 501 for detection. Therefore, the concentration of the interference gas (namely the interference gas such as ethanol, acetic acid and the like) can be respectively detected, so that whether the detected concentration of the methane gas is interfered by the interference gas or not is judged, and the false alarm of the alarm is avoided. Therefore, the zero point is checked once every time the filter turntable 301 rotates, and the error caused by the structure can be eliminated.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An apparatus for detecting a concentration of a target gas in a mixed gas, comprising: the device comprises a light source (1), a detector (2) and a filtering mechanism (3), wherein the filtering mechanism (3) is positioned between the light source (1) and the detector (2), and the detector (2) is positioned on a propagation path of an optical signal emitted by the light source (1);

the filtering mechanism (3) comprises a filter turntable (301) and a driving device (302) for controlling the filter turntable (301) to rotate, and is characterized in that the filtering mechanism (3) further comprises a target gas filter (303) arranged on the filter turntable (301), an interference gas filter (304) for detecting interference gas which has a coincident absorption band with the target gas in a spectrum absorption area in the mixed gas, and at least one reference filter (305) for providing fixed references for different detection environments;

the target gas filter (303), the interference gas filter (304) and the reference filter (305) can be moved to the propagation path of the optical signal emitted by the light source (1) by the rotation of the filter carousel (301).

2. The device for detecting a target gas concentration in a mixed gas according to claim 1, wherein the target gas filter (303), the interference gas filter (304) and the reference filter (305) are randomly arranged along a circumferential direction of the filter carousel (301), and a plane in which the target gas filter (303), the interference gas filter (304) and the reference filter (305) are located coincides with a rotation plane of the filter carousel (301).

3. The apparatus for detecting a target gas concentration in a mixed gas according to claim 1, wherein the filter mechanism (3) further comprises a magnet (306) provided on the filter carousel (301) and a hall sensor (307) for sensing a position of the magnet (306) to determine a reference position of the filter carousel (301).

4. The device for detecting the concentration of the target gas in the mixed gas according to claim 1, further comprising a light source cover (4) for containing the light source (1), wherein the light source cover (4) is provided with a first window sheet (401) for transmitting the optical signal emitted by the light source (1) to the detector (2).

5. The apparatus for detecting the concentration of a target gas in a mixed gas according to claim 4, further comprising a housing (5) for housing the detector (2) and the filter mechanism (3), wherein a second window (501) corresponding to the detector (2) and the first window (401) is disposed on the housing (5).

6. The device for detecting the concentration of a target gas in a mixed gas according to any one of claims 1 to 5, wherein the detector (2) is a single-channel detector.