Gas concentration detection device and gas collection and detection system

Abstract

The utility model provides a gas concentration detection device and a gas collection and detection system, and relates to the technical field of gas concentration detection. The gas concentration detection device comprises a gas chamber and a collimating lens, a light inlet hole and a light outlet hole are formed in the gas chamber; an incident light plane mirror, an emergent light plane mirror and a reflection assembly are installed in the gas chamber, the incident light plane mirror is installed at the light inlet hole, the emergent light plane mirror is installed at the light outlet hole, the reflection assembly is installed in the cavity of the gas chamber, and the collimating lens is installed on the side, away from the cavity, of the incident light plane mirror; the collimating lens is used for focusing scattered light emitted by the light source to the incident light plane mirror, the incident light plane mirror is used for enabling detection light to face the reflection assembly, and the emergent light plane mirror is used for receiving reflected light of the reflection assembly and emitting the reflected light out of the light outlet hole. The gas concentration detection device provided by the utility model solves the technical problem of low measurement precision of an NDIR gas chamber in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of gas concentration detection, in particular to a gas concentration detection device and a gas collection and detection system. Background Art

[0002] Exhaled breath contains some endogenous gases produced by the human body. Measuring the concentration of endogenous gases can be used to determine whether certain functions of the human body are normal. For example, the concentration of endogenous carbon monoxide can determine whether a person is hemolytic, and the concentration of endogenous hydrogen can determine whether a person is lactose intolerant. The concentration of some components in exhaled breath is very low (such as the concentration of endogenous carbon monoxide in exhaled breath), and conventional detection modules are difficult to accurately detect them. Non-dispersive infrared (NDIR) detection technology is suitable for use in exhaled breath endogenous gas detection scenarios because of its advantages such as high accuracy, fast response speed, strong anti-interference ability, and long service life.

[0003] Using NDIR technology, when a beam of infrared light passes through the gas to be tested, infrared light of a specific wavelength is selectively absorbed by the gas. The gas concentration can be determined by measuring the attenuation of infrared light of a specific wavelength. The light intensity and signal fluctuation collected by the NDIR light outlet probe have a great influence on the accuracy of the detection. The existing NDIR light outlet probe collects weak light intensity and large signal fluctuations, resulting in low measurement accuracy in the NDIR gas chamber. Utility Model Content

[0004] The utility model aims to provide a gas concentration detection device and a gas collection and detection system to alleviate the technical problem of low measurement accuracy of NDIR gas chamber in the prior art.

[0005] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0006] In a first aspect, the gas concentration detection device provided by the utility model includes a gas chamber and a collimating lens;

[0007] The gas chamber is provided with a light inlet hole and a light outlet hole communicating with the inside and outside;

[0008] An incident light plane mirror, an outgoing light plane mirror and a reflection component are installed in the gas chamber, the incident light plane mirror is installed at the light inlet hole, the outgoing light plane mirror is installed at the light outlet hole, the reflection component is installed in the chamber of the gas chamber, and the collimating lens is installed on a side of the incident light plane mirror away from the chamber;

[0009] The collimating lens is used to focus the scattered light emitted by the light source on the incident light plane mirror. The incident light plane mirror is used to direct the detection light towards the reflection component. The outgoing light plane mirror is used to receive the reflected light of the reflection component and emit the reflected light from the light outlet hole.

[0010] Furthermore, the gas concentration detection device further includes a light source mechanism, which is installed on the side wall of the gas chamber and corresponds to the position of the light inlet hole.

[0011] The light source mechanism includes a light source and a chopping wheel. The collimating lens is installed between the light source and the chopping wheel, or the collimating lens is installed between the chopping wheel and the incident light plane mirror.

[0012] Furthermore, the gas chamber includes a box body and a cover body. The cover body covers the opening end of the box body and is detachably connected to the box body.

[0013] The light inlet hole and the light outlet hole are provided on the box body.

[0014] Furthermore, the cover body is connected to the box body by fasteners.

[0015] Furthermore, the reflection component includes a first spherical mirror, a second spherical mirror and a third spherical mirror. The first spherical mirror is installed at one end of the box body, and the second spherical mirror and the third spherical mirror are arranged side by side at the other end of the box body.

[0016] The incident light plane mirror is used to direct the detection light introduced from the light inlet hole towards the second spherical mirror, so that the detection light forms a reciprocally reflected light ray between the first spherical mirror, the second spherical mirror and the third spherical mirror. The outgoing light plane mirror is used to receive the reflected light ray.

[0017] Furthermore, the first spherical mirror is embedded in the first end plate, and the first end plate is installed at one end of the box body.

[0018] Both the second spherical mirror and the third spherical mirror are embedded in the second end plate, and the second end plate is installed at the other end of the box body.

[0019] Furthermore, the first end plate and the box body are positioned by a first positioning pin, and the second end plate and the box body are positioned by a second positioning pin.

[0020] Furthermore, a first sealing member is installed between the cover body and the box body, a second sealing member is installed between the first end plate and the box body, and a third sealing member is installed between the second end plate and the box body.

[0021] Furthermore, the gas chamber is also provided with an air inlet and an air outlet communicating with the inside and the outside.

[0022] In a second aspect, the gas collection and detection system provided by the utility model includes a gas concentration detection device as described in any one of the above items.

[0023] Based on the above technical solutions, the technical effects that can be achieved by the present invention are analyzed as follows:

[0024] The gas concentration detection device provided by the utility model includes a gas chamber and a collimating lens; the gas chamber is provided with a light inlet and a light outlet that are connected to the inside and outside; an incident light plane mirror, an outgoing light plane mirror and a reflection component are installed in the gas chamber, the incident light plane mirror is installed at the light inlet, the outgoing light plane mirror is installed at the light outlet, the reflection component is installed in the chamber of the gas chamber, and the collimating lens is installed on the side of the incident light plane mirror away from the chamber; the collimating lens is used to focus the scattered light emitted by the light source on the incident light plane mirror, the incident light plane mirror is used to direct the detection light toward the reflection component, and the outgoing light plane mirror is used to receive the reflected light of the reflection component and emit the reflected light from the light outlet. The scattered light emitted by the light source is focused on the incident light plane mirror after passing through the collimating lens, and the detection light forms a reflected light under the reflection action of the incident light plane mirror and the reflection component; the reflected light is reflected by the outgoing light plane mirror and emitted from the light outlet. The gas concentration detection device installs a collimating lens at the front end of the incident light plane mirror to focus the light source, thereby avoiding the problem that part of the scattered light emitted by the light source is not reflected through the expected reflection path, and improving the light intensity and stability of the detection light emitted from the output light plane mirror, thereby improving the measurement accuracy of the gas concentration detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A cross-sectional view of a gas concentration detection device provided by an embodiment of the utility model;

[0027] Figure 2 A three-dimensional schematic diagram of a gas concentration detection device provided by an embodiment of the utility model;

[0028] Figure 3 An exploded view of a gas concentration detection device provided in an embodiment of the utility model;

[0029] Figure 4Schematic diagram of the gas collection and detection system provided by the embodiment of the present utility model in the online effective gas collection and measurement mode;

[0030] Figure 5 Schematic diagram of the gas collection and detection system provided by the embodiment of the present utility model in the offline effective gas collection mode;

[0031] Figure 6 Schematic diagram of the gas collection and detection system provided by the embodiment of the present utility model in the offline measurement mode of the first mode;

[0032] Figure 7 Schematic diagram of the gas collection and detection system provided by the embodiment of the present utility model in the offline measurement mode of the second mode.

[0033] Icon:

[0034] 100 - Gas chamber; 110 - Box body; 111 - Through hole; 121 - Incident light plane mirror; 122 - Exit light plane mirror; 123 - First spherical mirror; 124 - Second spherical mirror; 125 - Third spherical mirror; 130 - Cover body; 140 - First end plate; 141 - First positioning pin; 150 - Second end plate;

[0035] 200 - Collimating lens;

[0036] 300 - Light source mechanism; 310 - Light source; 320 - Chopper wheel;

[0037] 410 - First seal; 420 - Second seal; 430 - Third seal;

[0038] 510 - Inlet joint; 520 - Outlet joint;

[0039] 600 - Detection path; 610 - Exhaust port; 700 - Offline collection path; 810 - Sampler interface; 820 - Sample gas bag; 910 - Input gas source control part; 920 - Offline gas collection control part; 930 - Switching control part. Detailed implementation manners

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0041] Accordingly, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0042] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0043] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0044] In addition, the terms "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0045] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The following will describe in detail some embodiments of the present invention in conjunction with the drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0047] Embodiment 1

[0048] Using the NDIR technology, when a beam of infrared light passes through the gas to be measured, the infrared light of a specific wavelength is selectively absorbed by the gas. By measuring the attenuation of the infrared light of the specific wavelength, the gas concentration can be determined. The light intensity and signal fluctuation collected by the NDIR light outlet probe have a great impact on the detection accuracy. The light intensity collected by the existing NDIR light outlet probe is weak and the signal fluctuation is large, resulting in the problem of low measurement accuracy of the NDIR gas chamber. In addition, there are problems with inconvenient fixing and light adjustment of the internal lens in the existing NDIR gas chamber.

[0049] In view of this, the gas concentration detection device provided by the embodiment of the present invention includes a gas chamber 100 and a collimating lens 200; a light inlet hole and a light outlet hole communicating inside and outside are provided on the gas chamber 100; an incident light plane mirror 121, an outgoing light plane mirror 122 and a reflection assembly are installed in the gas chamber 100. The incident light plane mirror 121 is installed at the light inlet hole, the outgoing light plane mirror 122 is installed at the light outlet hole, the reflection assembly is installed in the cavity of the gas chamber 100, and the collimating lens 200 is installed on the side of the incident light plane mirror 121 away from the cavity; the collimating lens 200 is used to focus the scattered light emitted by the light source 310 on the incident light plane mirror 121, the incident light plane mirror 121 is used to direct the detection light towards the reflection assembly, and the outgoing light plane mirror 122 is used to receive the reflected light of the reflection assembly and emit the reflected light from the light outlet hole.

[0050] Specifically, the collimating lens 200 refers to a lens that can collect light. The detection light refers to the light after passing through the collimating lens 200. Further, the gas concentration detection device further includes a light receiver, and the light receiver is installed on the outer wall of the gas chamber 100 and is opposite to the position of the light outlet hole to receive the detection light emitted from the light outlet hole. Through comparative experiments, the total power of the detection intensity of the light receiver of the traditional NDIR gas chamber is 1.7993E-04 watts, while the total power of the detection intensity of the light receiver of the gas concentration detection device provided by the embodiment of the present invention is 2.8733E-04 watts; compared with the existing NDIR gas chamber, the energy intensity received by the light receiver of this gas concentration detection device has increased by 50%-60%. The above data are only the data of the comparative experiment and do not limit the structure and shape of this gas concentration detection device. The internal optical path of the traditional NDIR gas chamber is messy, and the optical path of some optical paths does not conform to the set path, making the actual light energy attenuation more serious and affecting the detection accuracy; after installing the collimating lens 200 at the front end of the incident light plane mirror 121 of this gas concentration detection device, the optical paths at different sagitta heights inside are consistent, improving the detection accuracy.

[0051] The scattered light emitted by the light source 310 is focused on the incident light plane mirror 121 after passing through the collimating lens 200, and the detection light forms a reflected light under the reflection action of the incident light plane mirror 121 and the reflection component; the reflected light is reflected by the exit light plane mirror 122 and emitted from the light exit hole. The gas concentration detection device installs the collimating lens 200 at the front end of the incident light plane mirror 121 to focus the light source 310, avoiding the problem that part of the scattered light emitted by the light source 310 is not reflected through the expected reflection path, and improving the light intensity and stability of the detection light emitted from the exit light plane mirror 122, thereby improving the measurement accuracy of the gas concentration detection device.

[0052] The structure and shape of the gas concentration detection device are described in detail below:

[0053] In an optional scheme of an embodiment of the utility model, the gas concentration detection device also includes a light source mechanism 300, which is installed on the side wall of the gas chamber 100 and corresponds to the position of the light inlet; the light source mechanism 300 includes a light source 310 and a light cutting wheel 320, and the collimating lens 200 is installed between the light source 310 and the light cutting wheel 320, or the collimating lens 200 is installed between the light cutting wheel 320 and the incident light plane mirror 121.

[0054] Specifically, the light source mechanism 300 is fixed on the outside of the gas chamber 100, at the position corresponding to the light inlet; the light source mechanism 300 includes a shell, a light source 310 and a light cutting wheel 320, and the shell is fixedly connected to a fixed shell on the outside of the gas chamber 100; the light source 310 is installed in the shell, and the light source 310 can generate infrared rays and is coaxially arranged with the light inlet. A motor is installed at one end of the shell, and a light-cutting wheel 320 is placed in the shell and is drivingly connected to the output shaft of the motor. Driven by the motor, the light-cutting wheel 320 can rotate around the axis. Two cavities are set in the light-cutting wheel 320 along its axial direction, and glass-sealed cavities are set at both ends of the light-cutting wheel 320. One cavity is filled with nitrogen and the other cavity is filled with carbon monoxide gas. When the light-cutting wheel 320 rotates, the infrared light emitted by the infrared light source will alternately pass through the nitrogen cavity and the carbon monoxide cavity and then enter the gas chamber 100. At the other end of the shell, that is, between the light-cutting wheel 320 and the light inlet, a filter is fixed to filter out unnecessary stray light. The collimating lens 200 is located between the light source 310 and the light-cutting wheel 320, and the collimating lens 200 is coaxially arranged with the light source 310; or, the collimating lens 200 is located between the light-cutting wheel 320 and the incident light plane mirror 121, and the collimating lens 200 is coaxially arranged with the light inlet. In this embodiment, refer to Figure 1 The collimating lens 200 is located between the cutting wheel 320 and the incident light plane mirror 121 .

[0055] The light source mechanism 300 includes a light source 310 and a chopping wheel 320. The collimating lens 200 is installed between the light source 310 and the chopping wheel 320, or the collimating lens 200 is installed between the chopping wheel 320 and the incident light flat mirror 121, so that the collimating lens 200 is located on the side of the incident light flat mirror 121 away from the chamber, thereby focusing the light source 310 on the incident light flat mirror 121.

[0056] In an alternative embodiment of the present utility model, the gas chamber 100 includes a box body 110 and a cover body 130. The cover body 130 covers the opening end of the box body 110 and is detachably connected to the box body 110; the light inlet hole and the light outlet hole are provided on the box body 110.

[0057] Specifically, referring to Figures 1 to 3 , the box body 110 is arranged as a cuboid, and a long-strip-shaped chamber is formed therein.

[0058] The cover body 130 is detachably connected to the box body 110. When it is necessary to adjust the angles of the incident light flat mirror 121 and the outgoing light flat mirror 122, etc., the cover body 130 can be opened to facilitate the operator's adjustment; moreover, since the light inlet hole and the light outlet hole are both provided on the side wall of the box body 110, correspondingly, the incident light flat mirror 121 and the outgoing light flat mirror 122 are not affected when the cover body 130 is removed. When the operator adjusts the angles of the incident light flat mirror 121 and the outgoing light flat mirror 122, the light source 310 can be turned on in time to detect whether the reflected light meets the expectation, which further facilitates the operator's adjustment. After the adjustment of the angles of the incident light flat mirror 121 and the outgoing light flat mirror 122 is completed, the cover body 130 can be covered on the box body 110 to play a sealing role.

[0059] In an alternative embodiment of the present utility model, the cover body 130 is connected to the box body 110 through a fastener.

[0060] Specifically, the fastener is arranged as a screw, and there are multiple screws which are arranged at intervals along the circumference of the cover body 130. Of course, the cover body 130 is clamped or connected by a buckle to the box body 110, etc., which should also be within the protection scope of the embodiments of the present utility model.

[0061] The cover body 130 is detachably connected to the box body 110 through screws, which is convenient for disassembling and assembling the cover body 130.

[0062] In an alternative embodiment of the present utility model, the reflection component includes a first spherical mirror 123, a second spherical mirror 124, and a third spherical mirror 125. The first spherical mirror 123 is installed at one end of the box body 110, and the second spherical mirror 124 and the third spherical mirror 125 are installed side by side at the other end of the box body 110; the incident light plane mirror 121 is used to direct the detection light introduced through the light inlet hole towards the second spherical mirror 124, so that the detection light forms a reciprocally reflected light ray between the first spherical mirror 123, the second spherical mirror 124, and the third spherical mirror 125, and the outgoing light plane mirror 122 is used to receive the reflected light ray.

[0063] Specifically, the first spherical mirror 123, the second spherical mirror 124, and the third spherical mirror 125 are all concave mirrors. A concave mirror refers to a spherical mirror with the inner side of the sphere as the reflecting surface. The scattered light emitted by the light source 310 is focused on the incident light plane mirror 121 after passing through the collimating lens 200, reflected by the incident light plane mirror 121 to the second spherical mirror 124, reflected by the second spherical mirror 124 to the first spherical mirror 123, reflected by the first spherical mirror 123 to the third spherical mirror 125, reflected by the third spherical mirror 125 to the outgoing light plane mirror 122, and then emitted from the light outlet hole after being reflected by the outgoing light plane mirror 122. Taking Figure 1 the viewing angle as an example, in this embodiment, the angle between the incident light plane mirror 121 and the side wall of the gas chamber 100 is set to 40° - 45°, the angle between the outgoing light plane mirror 122 and the bottom wall of the gas chamber 100 is set to 40° - 45°, the distance between the first spherical mirror 123 and the second spherical mirror 124 is much larger than the distance between the first spherical mirror 123 and the second spherical mirror 124, and the distance between the incident light plane mirror 121 and the outgoing light plane mirror 122 is much larger than the distance between the light receiver and the outgoing light plane mirror 122.

[0064] The reflection component realizes the refraction of the detection light in the chamber of the gas chamber 100, so that the detection light is fully and selectively absorbed by the gas in the chamber, improving the detection accuracy.

[0065] In an alternative embodiment of the present utility model, the first spherical mirror 123 is embedded in the first end plate 140, and the first end plate 140 is installed at one end of the box body 110; the second spherical mirror 124 and the third spherical mirror 125 are both embedded in the second end plate 150, and the second end plate 150 is installed at the other end of the box body 110.

[0066] Specifically, through holes 111 are provided at both ends of the box body 110. The first end plate 140 is installed at one end of the box body 110 and the first spherical mirror 123 extends into the through hole 111 at this end of the box body 110; similarly, the second end plate 150 is installed at the other end of the box body 110, and the second spherical mirror 124 and the third spherical mirror 125 extend into the through hole 111 at this end of the box body 110.

[0067] The first end plate 140 fixes the first spherical mirror 123 and positions the first spherical mirror 123 inside the box body 110. The second end plate 150 fixes the second spherical mirror 124 and the third spherical mirror 125 and positions the second spherical mirror 124 and the third spherical mirror 125 inside the box body 110.

[0068] In an alternative embodiment of the present utility model, the first end plate 140 and the box body 110 are positioned by a first positioning pin 141, and the second end plate 150 and the box body 110 are positioned by a second positioning pin.

[0069] Specifically, one end of the box body 110 is provided with a first positioning blind hole, and the end face of the first end plate 140 where the first spherical mirror 123 is installed is correspondingly provided with a first positioning hole. The first end plate 140 is installed at one end of the box body 110, and both ends of the first positioning pin 141 are respectively inserted into the first positioning blind hole and the first positioning hole to position the first end plate 140, thereby positioning the first spherical mirror 123. Similarly, the other end of the box body 110 is provided with a second positioning blind hole, and the end face of the second end plate 150 where the second spherical mirror 124 is installed is correspondingly provided with a second positioning hole. The second end plate 150 is installed at the other end of the box body 110, and both ends of the second positioning pin are respectively inserted into the second positioning blind hole and the second positioning hole to position the second end plate 150, thereby positioning the second spherical mirror 124 and the third spherical mirror 125.

[0070] The first end plate 140 and the box body 110 are positioned by the first positioning pin 141, which improves the installation accuracy of the first end plate 140 and the position accuracy of the first spherical mirror 123, thereby improving the detection accuracy of the gas concentration detection device. The second end plate 150 and the box body 110 are positioned by the second positioning pin, which improves the installation accuracy of the second end plate 150 and the position accuracy of the second spherical mirror 124 and the third spherical mirror 125, thereby improving the detection accuracy of the gas concentration detection device.

[0071] In an alternative embodiment of the present utility model, a first sealing member 410 is installed between the cover body 130 and the box body 110, a second sealing member 420 is installed between the first end plate 140 and the box body 110, and a third sealing member 430 is installed between the second end plate 150 and the box body 110.

[0072] Specifically, the first sealing member 410, the second sealing member 420, and the third sealing member 430 are all set as sealing rings, and the box body 110 is provided with installation grooves at positions corresponding to the first sealing member 410, the second sealing member 420, and the third sealing member 430, so that the first sealing member 410, the second sealing member 420, and the third sealing member 430 are stably installed on the box body 110.

[0073] The first seal 410 improves the sealing performance between the cover 130 and the box body 110; the second seal 420 improves the sealing performance between the first end plate 140 and the box body 110; the third seal 430 improves the sealing performance between the second end plate 150 and the box body 110.

[0074] In an alternative embodiment of the present utility model, the gas chamber 100 is further provided with an air inlet hole and an air outlet hole for communicating the inside and the outside.

[0075] Specifically, the gas concentration detection device further includes an air inlet joint 510 and an air outlet joint 520. The air inlet joint 510 is communicated with the air inlet hole, and the air outlet joint 520 is communicated with the air outlet hole.

[0076] The air inlet hole is used for allowing gas to enter the chamber of the gas chamber 100, and the air outlet hole is used for allowing gas to discharge from the chamber of the gas chamber 100.

[0077] Embodiment Two

[0078] The gas collection and detection system provided by the embodiment of the present utility model includes the gas concentration detection device described in Embodiment One, and thus also has all the beneficial effects of Embodiment One, which will not be elaborated herein.

[0079] In an alternative embodiment of the present utility model, the gas collection and detection system includes a detection passage 600, an off-line collection passage 700, a detection mechanism, a control mechanism, an exhaust port 610, a sampler interface 810, and a sample gas bag 820; the detection mechanism is installed in the detection passage 600, the control mechanism includes an input gas source control member 910, and the input gas source control member 910 is installed at the inlet of the detection passage 600 to switch the inlet of the detection passage 600 to be in fluid communication with the sampler interface 810 or the sample gas bag 820; the control mechanism further includes an off-line gas collection control member 920, and the off-line gas collection control member 920 is installed at the outlet of the detection passage 600 to switch the outlet of the detection passage 600 to be in communication with the exhaust port 610 or the off-line collection passage 700; the control mechanism includes a switching control member 930, and the switching control member 930 is installed at the communication port of the sample gas bag 820 to switch the sample gas bag 820 to be in communication with the input gas source control member 910 or in fluid communication with the off-line collection passage 700; the detection mechanism includes a carbon dioxide sensor and a gas concentration detection device, and both the carbon dioxide sensor and the gas concentration detection device are installed in the detection passage 600, and the carbon dioxide sensor is located upstream of the gas concentration detection device.

[0080] Specifically, in this embodiment, the input gas source control member 910, the off-line gas collection control member 920, and the switching control member 930 are all set as two-position three-way solenoid valves, and the communication of different interfaces is achieved by adjusting the valve core position of the solenoid valve; for example, refer to Figure 4, the input gas source control component 910 includes an A interface, a B interface, and a C interface. The A interface is connected to the switching control component 930, the B interface is connected to the detection path 600, and the C interface is connected to the sampler interface 810. By changing the position of the valve core, the B interface is connected to the A interface or the C interface, thereby realizing the fluid communication between the inlet of the detection path 600 and the sampler interface 810 or the sample gas bag 820.

[0081] This gas collection and detection system integrates the functions of on-line detection, off-line collection, and off-line detection. The following introduces the different functions of the detection system:

[0082] See Figure 4 , the arrows in the figure indicate the gas flow direction. During on-line detection, the input gas source control component 910 is switched to connect the detection path 600 to the sampler interface 810, and the off-line gas collection control component 920 is switched to connect the detection path 600 to the exhaust port 610. The gas to be detected flows into the detection path 600 from the sampler interface 810, and after being detected by the detection mechanism on the detection path 600, it is discharged from the exhaust port 610.

[0083] See Figure 5 , the arrows in the figure indicate the gas flow direction. During off-line collection, the input gas source control component 910 is switched to connect the detection path 600 to the sampler interface 810, the off-line gas collection control component 920 is switched to connect the detection path 600 to the off-line collection path 700, and the switching control component 930 is switched to connect the sample gas bag 820 to the off-line collection path 700. The gas to be detected flows from the sampler interface 810 through the detection path 600 and the off-line collection path 700 and is collected into the sample gas bag 820.

[0084] See Figure 6 Or Figure 7 , the arrows in the figure indicate the gas flow direction. During off-line detection, the switching control component 930 is switched to connect the sample gas bag 820 to the input gas source control component 910, and the input gas source control component 910 is switched to connect the detection path 600 to the switching control component 930 to realize the fluid communication between the detection path 600 and the sample gas bag 820. The off-line gas collection control component 920 is switched to connect the detection path 600 to the exhaust port 610. The collected gas to be detected in the sample gas bag 820 flows from the sample gas bag 820 into the detection path 600, and after being detected by the detection mechanism on the detection path 600, it is discharged from the exhaust port 610.

[0085] The gas collection and detection system detects different gas contents in exhaled breath through a detection mechanism; especially the content of carbon monoxide in exhaled breath. Of course, it is not limited to carbon monoxide, and different gas contents can be detected by replacing the appropriate detection mechanism; through the control mechanism, the gas collection and detection system can collect and detect different gas contents in exhaled breath online, or can collect exhaled breath offline, or can detect different gas contents in exhaled breath offline, which is applicable to a variety of different usage scenarios, facilitating users to use according to different situations, expanding the applicable range of the detection system, and simplifying the operation of switching equipment.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gas concentration detection device, characterized in that, include: A gas chamber (100) and a collimating lens (200); The gas chamber (100) is provided with a light inlet hole and a light outlet hole communicating with the inside and outside; An incident light plane mirror (121), an exit light plane mirror (122) and a reflection component are installed in the gas chamber (100); the incident light plane mirror (121) is installed at the light inlet hole, the exit light plane mirror (122) is installed at the light exit hole, the reflection component is installed in the chamber of the gas chamber (100), and the collimating lens (200) is installed on a side of the incident light plane mirror (121) that is away from the chamber; The collimating lens (200) is used to focus the scattered light emitted by the light source (310) onto the incident light plane mirror (121), the incident light plane mirror (121) is used to direct the detection light toward the reflection component, and the exit light plane mirror (122) is used to receive the reflected light of the reflection component and emit the reflected light from the light exit hole.

2. The gas concentration detection device according to claim 1, characterized in that, The gas concentration detection device further comprises a light source mechanism (300), wherein the light source mechanism (300) is installed on a side wall of the gas chamber (100) and corresponds to the position of the light inlet hole; The light source mechanism (300) comprises a light source (310) and a cutting wheel (320), and the collimating lens (200) is installed between the light source (310) and the cutting wheel (320), or the collimating lens (200) is installed between the cutting wheel (320) and the incident light plane mirror (121).

3. The gas concentration detection device according to claim 1, characterized in that, The gas chamber (100) comprises a box body (110) and a cover body (130), wherein the cover body (130) is disposed on an open end of the box body (110) and is detachably connected to the box body (110); The light inlet and light outlet are arranged on the box body (110).

4. The gas concentration detection device according to claim 3, wherein The cover body (130) is connected to the box body (110) via a fastener.

5. The gas concentration detection device according to claim 3, wherein, The reflection assembly comprises a first spherical mirror (123), a second spherical mirror (124) and a third spherical mirror (125), wherein the first spherical mirror (123) is mounted on one end of the box body (110), and the second spherical mirror (124) and the third spherical mirror (125) are mounted side by side on the other end of the box body (110); The incident light plane mirror (121) is used to direct the detection light introduced by the light inlet toward the second spherical mirror (124), so that the detection light forms a reflected light beam that is reciprocally reflected between the first spherical mirror (123), the second spherical mirror (124) and the third spherical mirror (125), and the exit light plane mirror (122) is used to receive the reflected light beam.

6. The gas concentration detection device according to claim 5, characterized in that, The first spherical mirror (123) is embedded in the first end plate (140), and the first end plate (140) is installed on one end of the box body (110); The second spherical mirror (124) and the third spherical mirror (125) are both embedded in the second end plate (150), and the second end plate (150) is installed on the other end of the box body (110).

7. The gas concentration detection device according to claim 6, wherein, The first end plate (140) and the box body (110) are positioned by a first positioning pin (141), and the second end plate (150) and the box body (110) are positioned by a second positioning pin.

8. The gas concentration detection device according to claim 6, wherein, A first seal (410) is installed between the cover body (130) and the box body (110), a second seal (420) is installed between the first end plate (140) and the box body (110), and a third seal (430) is installed between the second end plate (150) and the box body (110).

9. The gas concentration detection device according to claim 1, wherein, The gas chamber (100) is further provided with an air inlet hole and an air outlet hole for communicating the inside and the outside.

10. A gas collection and detection system, characterized in that, It includes the gas concentration detection device according to any one of claims 1-9.

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