Gas detection device

Abstract

The utility model relates to a gas detection device. The gas detection device comprises a shell, a reflecting part, a light-emitting part and a detector, the shell is provided with a containing cavity and a gas inlet communicated with the containing cavity, and the gas inlet is used for introducing gas to be detected; the reflecting piece is fixedly arranged in the accommodating cavity and is used for dividing the accommodating cavity into a first cavity body and a second cavity body which are communicated with each other; the light-emitting part is fixedly arranged in the first cavity and is used for emitting infrared light; and the detector is fixedly arranged in the second cavity and is used for receiving the infrared light reflected by the reflecting piece so as to detect the concentration of the to-be-detected gas. According to the gas detection device, the optical path of the detected gas is increased, the detected gas can fully interact with light, the light absorption effect of the detected gas can be improved, the concentration precision of the detected gas is improved, and the accuracy of a detection result is improved.

Description

Technical Field

[0001] The present application relates to the technical field of gas detection, and in particular to a gas detection device. Background Art

[0002] Gas sensors can be used to detect the concentrations of gases such as CO, CO2, and NH3. The absorption of light of a specific frequency by the measured gas follows the Lambert-Beer law, which states that absorbance is proportional to the optical pathlength and the concentration of the measured gas. However, the optical pathlength of the measured gas in current gas sensors is short, making it difficult for the measured gas to fully interact with light. Consequently, the measured gas's absorption of light is weak, reducing the accuracy of the gas sensor's detection of gas concentration and affecting the accuracy of the test results. Utility Model Content

[0003] Based on this, it is necessary to provide a gas detection device to address the problem that the optical path of the measured gas in the current gas sensor is short, it is difficult to fully interact with light, and the absorption effect of the measured gas on light is not obvious, which reduces the accuracy of the gas sensor in detecting the gas concentration and affects the accuracy of the detection results.

[0004] A gas detection device, comprising:

[0005] A housing, wherein the housing is provided with a receiving cavity and an air inlet communicated with the receiving cavity, wherein the air inlet is used to allow the gas to be measured to pass through;

[0006] a reflector, the reflector being fixedly disposed in the accommodating cavity and being used to separate the accommodating cavity into a first cavity and a second cavity that are connected;

[0007] a light-emitting element, the light-emitting element being fixedly disposed in the first cavity and configured to emit infrared light;

[0008] A detector is fixedly arranged in the second cavity, and is used to receive the infrared light reflected by the reflector to detect the concentration of the gas to be measured.

[0009] In one embodiment, the shell includes a top wall, a bottom wall and a peripheral wall that are connected to each other, the peripheral wall is arranged between the top wall and the bottom wall, at least one of the top wall, the bottom wall and the peripheral wall is provided with the air inlet, the middle part of the reflector is connected to the top wall or the bottom wall, the periphery of the reflector is spaced apart from the peripheral wall, the first cavity is formed between the reflector and the bottom wall, and the second cavity is formed between the reflector and the top wall.

[0010] In one embodiment, the shell further includes a first inclined wall and a second inclined wall, the first inclined wall is arranged between the top wall and the peripheral wall, the second inclined wall is arranged between the bottom wall and the peripheral wall, the first inclined wall has a first reflecting inclined surface, the second inclined wall has a second reflecting inclined surface, and the first reflecting inclined surface and the second reflecting inclined surface both face the reflecting element.

[0011] In one embodiment, the detector includes at least one, and the detectors are all arranged on the top wall and symmetrically arranged about the center of the top wall; and / or, the light-emitting member includes at least one, and the light-emitting member is all arranged on the bottom wall and symmetrically arranged about the center of the bottom wall; and / or, the air inlet includes at least one, and the air inlet is arranged on the top wall and close to the center of the top wall, and / or, the air inlet is arranged on the bottom wall and close to the center of the bottom wall.

[0012] In one embodiment, the distance d1 between the reflector and the top wall is equal to the distance d2 between the reflector and the bottom wall.

[0013] In one embodiment, the distance h between any point on the periphery of the reflector and the peripheral wall is the same.

[0014] In one embodiment, the reflective members include a plurality of reflective members, all of which are spaced apart from each other and stacked in sequence in the accommodating cavity, wherein one of the reflective members and the cavity wall of the shell form the first cavity, and another reflective member and the cavity wall of the shell form the second cavity.

[0015] In one embodiment, the reflector includes a first reflector and a second reflector stacked and spaced apart from each other, the middle portion of the first reflector is connected to the shell, the outer periphery of the first reflector is spaced apart from the shell, the middle portion of the second reflector is penetrated by a light-transmitting opening, and the outer periphery of the second reflector is connected to the shell.

[0016] In one embodiment, the shell protrudes into the accommodating cavity to form a reflective structure, the outer periphery of the second reflective member is connected to the reflective structure, and the reflective structure has a third reflective slope, which faces the first reflective member adjacent to the second reflective member or another second reflective member.

[0017] In one embodiment, the shell is provided with a first mounting groove connected to the first cavity, and the first mounting groove is used to fix the light-emitting part, and / or the shell is provided with a second mounting groove connected to the second cavity, and the second mounting groove is used to fix the detector.

[0018] In the above-described gas detection device, a reflective element divides the receiving chamber into a first and second interconnected chambers, and the light-emitting element and detector are disposed within the first and second chambers. When the light-emitting element emits infrared light, the light is reflected multiple times by the reflective element, lengthening the light's propagation path within the receiving chamber. This increases the time and distance for the light to interact with the gas being detected, allowing the gas to fully absorb the infrared light and improving the detector's detection accuracy. The infrared light absorbed by the gas being detected is then received by the detector, which can then detect the concentration of the gas being detected based on the absorbed infrared light. The reflective element helps distribute the infrared light emitted by the light-emitting element more evenly within the receiving chamber, allowing the gas being detected to fully absorb the infrared light, further improving detection accuracy. Furthermore, the reflective element allows the infrared light to be reflected multiple times within a limited space, thereby increasing the length of the interaction path between the light and the gas being detected. Reflection achieves a longer optical path without increasing the physical size of the device, thereby improving detection sensitivity and accuracy. This allows for efficient gas detection within a smaller space, avoiding the need to increase the device size to achieve a sufficiently long optical path. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0020] Figure 1 This is a cross-sectional view from a frontal perspective of a gas detection device provided in an embodiment of the present application.

[0021] Figure 2 This is a cross-sectional view from a top view of a gas detection device provided in an embodiment of the present application.

[0022] Figure 3 This is a cross-sectional view from a bottom perspective of a gas detection device provided in an embodiment of the present application.

[0023] Figure 4 This is a cross-sectional view from a frontal perspective of a gas detection device provided in an embodiment of the present application.

[0024] Figure 5 A cross-sectional view from a front view of another gas detection device provided in an embodiment of the present application.

[0025] Explanation of the accompanying drawings: 100, gas detection device; 11, air inlet; 12, first cavity; 13, second cavity; 14, top wall; 15, bottom wall; 16, peripheral wall; 17, first inclined wall; 171, first reflecting inclined surface; 18, second inclined wall; 181, second reflecting inclined surface; 19, reflecting structure; 191, third reflecting inclined surface; 2, reflecting member; 21, first reflecting member; 22, second reflecting member; 221, light-transmitting port; 3, light-emitting member; 31, first mounting structure; 311, first mounting groove; 4, detector; 41, second mounting structure; 411, second mounting groove. DETAILED DESCRIPTION

[0026] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0027] Currently, gas sensors used for gas concentration detection mainly include electrochemical, semiconductor, solid electrolyte, optical, and polymer types. Among them, optical non-dispersive infrared (NDIR) gas sensors have better overall performance. With the development of infrared light sources and electronic technology, NDIR gas sensors are very common in practical applications as a fast and accurate gas detection instrument. Its detection principle is: gases with asymmetric diatomic or polyatomic molecular structures (such as CH4, CO2, CO, SO2, etc.) have characteristic absorption spectra in the mid-infrared band, and the intensity of the characteristic absorption spectrum of the gas is related to the concentration of the gas. The absorption of light of a specific frequency by the measured gas follows the Lambert-Beer law, which states that the absorbance is proportional to the optical path length and the concentration of the measured gas.

[0028] However, the optical path of the gas being measured in current gas sensors is relatively short, making it difficult for the gas to fully interact with light. The gas being measured does not absorb light sufficiently, which reduces the accuracy of the gas sensor in detecting gas concentration and affects the accuracy of the detection results.

[0029] See also Figure 1Based on this problem, an embodiment of the present application provides a gas detection device 100. The gas detection device 100 includes a shell, a reflector 2, a light-emitting component 3 and a detector 4. The shell is provided with a accommodating cavity and an air inlet 11 connected to the accommodating cavity, and the air inlet 11 is used to introduce the gas to be measured. The reflector 2 is fixed in the accommodating cavity, and the reflector 2 is used to separate the accommodating cavity into a first cavity 12 and a second cavity 13 that are connected. The light-emitting component 3 is fixed in the first cavity 12, and the light-emitting component 3 is used to emit infrared light. The detector 4 is fixed in the second cavity 13, and the detector 4 is used to receive the infrared light reflected back by the reflector 2 to detect the concentration of the gas to be measured. The reflector 2 divides the accommodating chamber into a connected first cavity 12 and a second cavity 13. The light-emitting element 3 and the detector 4 are located within the first cavity 12 and the second cavity 13, respectively. When the light-emitting element 3 emits infrared light, the light is reflected multiple times by the reflector 2, which lengthens the light's propagation path within the accommodating chamber. This increases the time and distance for the light to interact with the gas being measured, allowing the gas to fully absorb the infrared light and improving the detection accuracy of the detector 4. The infrared light absorbed by the gas being measured is then received by the detector 4, which can then detect the concentration of the gas being measured based on the absorbed infrared light. The reflector 2 helps distribute the infrared light emitted by the light-emitting element 3 more evenly within the accommodating chamber, allowing the gas being measured to more fully absorb the infrared light, further improving detection accuracy. Furthermore, the reflector 2 causes the infrared light to reflect multiple times within a limited space, thereby increasing the length of the interaction path between the light and the gas being measured. This reflection achieves a longer optical path without increasing the physical size of the device, improving detection sensitivity and accuracy. This allows efficient gas detection to be achieved in a smaller space, avoiding the need to increase the size of the device to obtain a sufficiently long optical path.

[0030] It should be noted that, in an optional embodiment, the light emitting element 3 in the present embodiment emits composite light, i.e., composite light comprising infrared light of different wavelengths. Light of different wavelengths will be absorbed to varying degrees by the gas to be measured. The detector 4 in the present embodiment can be configured with a single, specific filter that only allows light of a single, specific wavelength to pass through, thereby measuring the degree of absorption of light of a particular wavelength. When multiple gases need to be detected, multiple detectors can be provided, each detecting a different wavelength of light.

[0031] In an optional embodiment, the housing may be a spherical housing, a square housing, a trapezoidal housing, etc. The housing may be manufactured by integral molding or by separate assembly molding.

[0032] In an optional embodiment, the accommodating cavity of the shell may be a cylindrical cavity, a spherical cavity, a square cavity, a trapezoidal cavity, etc.

[0033] In an optional embodiment, the reflector 2 may be of a regular shape or an irregular shape. When the reflector 2 is of a regular shape, the reflector 2 may be in a circular, square, regular pentagon, regular hexagon, regular heptagon, etc. Alternatively, the reflector 2 may be in a trapezoidal, rhombus, semicircular, etc.

[0034] In some preferred embodiments, the accommodating cavity of the shell is a cylindrical cavity, and the reflector 2 is circular. The circular reflector 2 can provide a more regular infrared light reflection path in the cylindrical cavity. The reflection angle of the infrared light between the circular reflector 2 and the cylindrical cavity wall is relatively consistent, so that the reflected light signal received by the detector 4 is more stable and predictable. This helps to improve the accuracy and repeatability of the detection and reduce the error caused by the irregular reflection path. The combination of the cylindrical cavity and the circular reflector 2 can reduce the generation and interference of stray light. The irregular shape of the cavity and the reflector 2 may cause the infrared light to be scattered irregularly multiple times during the reflection process, increasing the intensity of the stray light. The circular structure can make the reflection of the infrared light more concentrated and orderly, reducing the impact of stray light on the detection results.

[0035] See also Figure 1 In some embodiments, the housing includes a top wall 14, a bottom wall 15, and a peripheral wall 16 that are connected. The peripheral wall 16 is disposed between the top wall 14 and the bottom wall 15. In an optional embodiment, at least one of the top wall 14, the bottom wall 15, or the peripheral wall 16 has a reflective surface facing the accommodating cavity, so that the housing also has a light-reflecting effect.

[0036] See also Figure 1 and Figure 2 In some embodiments, the light-emitting element 3 includes at least one, and all light-emitting elements 3 are disposed on the bottom wall 15 and are symmetrically arranged about the center of the bottom wall 15. For example, the number of light-emitting elements 3 may be one, two, three, or four. Providing multiple light-emitting elements 3 can emit infrared light of multiple specific wavelengths for various gases. In other embodiments, the light emitted by a single light-emitting element 3 may not be centrally symmetrical. To improve the symmetry of the light, multiple light-emitting elements 3 may be provided.

[0037] See also Figure 1 and Figure 3 In some embodiments, the detector 4 includes at least one detector 4, which are all arranged on the top wall 14 and are symmetrically arranged around the center of the top wall 14 (see Figure 3 For example, the number of detectors 4 may be one, two, three, or four. Arranging multiple detectors 4 can detect the concentrations of multiple gases.

[0038] See also Figure 1In some embodiments, at least one of the top wall 14, the bottom wall 15, and the peripheral wall 16 is provided with an air inlet 11. In some embodiments, there may be one or more air inlets 11. In some embodiments, the air inlet 11 includes at least one, the air inlet 11 is provided on the top wall 14 and is close to the center of the top wall 14, and / or, the air inlet 11 is provided on the bottom wall 15 and is close to the center of the bottom wall 15. It is understandable that the air inlet 11 can be provided on the top wall 14, on the bottom wall 15, or on both the top wall 14 and the bottom wall 15. The number of air inlets 11 can be one, two, three, four, etc. Please refer to Figure 1 The air inlet 11 can be symmetrically arranged about the center of the top wall 14 and / or about the center of the bottom wall 15. When the air inlet 11 is arranged near the center of the top wall 14 or the bottom wall 15, the air inlet 11 is also close to the position of the light emitting element 3 or the detector 4, allowing the gas to pass through a longer optical path, thereby improving the absorption effect of infrared light and enhancing detection accuracy.

[0039] See also Figures 1 to 3 In an optional embodiment, the number of light-emitting elements 3, detectors 4 and gas inlets 11 is the same, so that each gas inlet 11 is fed with a gas to be measured.

[0040] See also Figure 1 In some embodiments, the housing has a first mounting groove 311 in communication with the first cavity 12, for securing the light-emitting element 3. The housing has a second mounting groove 411 in communication with the second cavity 13, for securing the detector 4. Providing the first and second mounting grooves 311, 411 can improve the stability of securing the light-emitting element 3 and the detector 4.

[0041] Furthermore, the number of the first mounting slots 311 is the same as the number of the light emitting elements 3, which can be one, two, three, four, etc. Similarly, the number of the second mounting slots 411 is the same as the number of the light emitting elements 3, which can be one, two, three, four, etc.

[0042] See also Figure 1 and Figure 2 In some embodiments, the bottom wall 15 of the housing is provided with a first mounting structure 31 protruding toward the interior of the first cavity 12. A first mounting groove 311 is defined on the top surface of the first mounting structure 31, with the opening of the first mounting groove 311 facing the top wall 14 of the housing. Furthermore, to facilitate installation of the light-emitting element 3 in the first mounting groove 311, a gap is provided between the outer peripheral surface of the light-emitting element 3 and the wall surface of the first mounting groove 311.

[0043] See also Figure 1 and Figure 3In some embodiments, a second mounting structure 41 is protruded from the top wall 14 of the shell toward the inside of the second cavity 13 , and a second mounting groove 411 is formed on the side of the second mounting structure 41 , with the notch of the second mounting groove 411 facing the outer wall 16 of the shell.

[0044] See also Figure 1 In some embodiments, the housing further includes a first slanted wall 17 and a second slanted wall 18. The first slanted wall 17 is disposed between the top wall 14 and the peripheral wall 16, and the second slanted wall 18 is disposed between the bottom wall 15 and the peripheral wall 16. The first slanted wall 17 has a first reflective slope 171, and the second slanted wall 18 has a second reflective slope 181. Both the first reflective slope 171 and the second reflective slope 181 face the reflective element 2. The first reflective slope 171 of the first slanted wall 17 and the second reflective slope 181 of the second slanted wall 18 face the reflective element 2, greatly increasing the reflective area within the accommodating cavity. When the infrared light emitted by the light-emitting element 3 propagates within the accommodating cavity, in addition to being reflected by the reflective element 2, it can also be reflected by the first reflective slope 171 and the second reflective slope 181. This allows more infrared light to be reflected multiple times within the accommodating cavity, increasing the opportunity for interaction with the gas to be detected, improving the intensity of the infrared light signal received by the detector 4, and thereby enhancing the sensitivity and accuracy of gas detection.

[0045] In an optional embodiment, a portion of the outer peripheral edge of the reflector 2 is connected to at least one of the top wall 14 , the bottom wall 15 or the outer peripheral wall 16 , and another portion of the outer peripheral edge of the reflector 2 extends into the accommodating cavity.

[0046] See also Figure 1 In other embodiments, in some embodiments, the middle portion of the reflector 2 is connected to the top wall 14 or the bottom wall 15, the periphery of the reflector 2 is spaced apart from the peripheral wall 16, a first cavity 12 is formed between the reflector 2 and the bottom wall 15, and a second cavity 13 is formed between the reflector 2 and the top wall 14. The peripheral wall 16 is spaced apart from the periphery of the reflector 2 so that the reflector 2 can better play a reflective role. The infrared light is reflected multiple times by the reflector 2, and the interval setting can ensure that the path of the reflected light is clearer, reducing the loss and direction change of the reflected light caused by partial connection. In this way, the intensity of the infrared light received by the detector 4 can be increased, and the sensitivity of the gas detection device 100 can be enhanced.

[0047] See also Figure 1 In an optional embodiment, the middle portion of the reflector 2 is connected to the first mounting structure 31 .

[0048] See also Figure 4 In an optional embodiment, the distance h between the periphery of the reflector 2 and the peripheral wall 16 is different. When the distances are different, a portion of the periphery of the reflector 2 is closer to the peripheral wall 16, and another portion of the periphery is farther away from the peripheral wall 16.

[0049] See also Figure 4 In other embodiments, in some embodiments, the spacing h between any point on the periphery of the reflector 2 and the peripheral wall 16 is the same. In other words, the peripheral contour of the reflector 2 is consistent with the contour shape of the peripheral wall 16, and the reflector 2 is located in the center of the peripheral wall 16. The same spacing makes the reflection path of the infrared light more regular and consistent when it passes through the reflector 2 and the reflective surface. This ensures that the reflected light signal received by the detector 4 is more stable, improving the accuracy and repeatability of the detection. On the contrary, if the spacing between the reflector 2 and the peripheral wall 16 is inconsistent, the reflection path of the infrared light will become complex and changeable, resulting in unstable signal strength and angle received by the detector 4, affecting the detection results.

[0050] See also Figure 4 In an alternative embodiment, the distance d1 between the reflector 2 and the top wall 14 is different from the distance d2 between the reflector 2 and the bottom wall 15. In other words, the reflector 2 can be closer to the top wall 14 and farther from the bottom wall 15; or the reflector 2 can be farther from the top wall 14 and closer to the bottom wall 15.

[0051] See also Figure 4 In other embodiments, in some examples, the spacing d1 between the reflector 2 and the top wall 14 is equal to the spacing d2 between the reflector 2 and the bottom wall 15. This equal spacing makes the reflection path of infrared light between the reflector 2 and the top and bottom walls 14, 15 more symmetrical and stable. Regardless of which cavity the infrared light first passes through after being emitted from the light-emitting element 3, the path length and angle of the infrared light reaching the detector 4 after multiple reflections are relatively consistent. This ensures that the intensity and characteristics of the infrared light signal received by the detector 4 are more stable, improving the repeatability and accuracy of detection.

[0052] See also Figure 1 In some embodiments, the number of the reflector 2 is one. Figure 5 In other embodiments, the reflector 2 includes a plurality of reflectors 2, all of which are spaced apart from each other and stacked in sequence in the accommodating cavity, wherein one reflector 2 forms a first cavity 12 with the cavity wall of the shell, and another reflector 2 forms a second cavity 13 with the cavity wall of the shell. The plurality of reflectors 2 are spaced apart from each other and stacked in sequence, which greatly increases the propagation path length of the infrared light in the accommodating cavity. Infrared light can be reflected multiple times between the plurality of reflectors 2, and has more opportunities to interact with the gas to be measured. This enables the detector 4 to receive a stronger infrared light signal after gas absorption, thereby improving the accuracy and sensitivity of detection. The extended optical path enables the gas to be measured to absorb infrared light more fully. Gases to be measured with different concentrations have different degrees of absorption of infrared light. Increasing the optical path can make this absorption effect more obvious, which helps to accurately determine the concentration of the gas.

[0053] In an optional embodiment, each reflective member 2 may be connected to at least one of the top wall 14, the bottom wall 15, or the bottom wall 15. For example, a portion of the reflective members 2 is connected to the top wall 14, another portion of the reflective members 2 is connected to the bottom wall 15, and another portion of the reflective members 2 is connected to the peripheral wall 16. Alternatively, all reflective members 2 are connected to the top wall 14, the bottom wall 15, or the peripheral wall 16. Alternatively, a portion of the reflective members 2 is connected to the top wall 14, and another portion of the reflective members 2 is connected to the bottom wall 15. Alternatively, a portion of the reflective members 2 is connected to the bottom wall 15, and another portion of the reflective members 2 is connected to the peripheral wall 16. Alternatively, a portion of the reflective members 2 is connected to the top wall 14, and another portion of the reflective members 2 is connected to the peripheral wall 16.

[0054] See also Figure 5 In other optional embodiments, in some embodiments, the multiple reflective members 2 include a first reflective member 21 and a second reflective member 22 stacked and spaced apart from each other, the middle portion of the first reflective member 21 being connected to the housing, the outer periphery of the first reflective member 21 being spaced apart from the housing, the middle portion of the second reflective member 22 being provided with a light-transmitting opening 221, and the outer periphery of the second reflective member 22 being connected to the housing. Light can enter from the outer periphery of the first reflective member 21, and after multiple reflections between the first reflective member 21 and the second reflective member 22, exit from the light-transmitting opening 221 in the middle portion of the second reflective member 22. This arrangement can further increase the optical path of the light, further prolong the interaction time and distance between the light and the gas to be measured, further enable the gas to be measured to fully absorb infrared light, and thus improve the detection accuracy of the detector 4.

[0055] In an optional embodiment, the spacing between the outer periphery of the first reflector 21 and the housing may be the same or different. This arrangement has been described in detail above and will not be repeated here. The second reflector 22 has a light-transmitting opening 221 at its center or near its outer periphery. The specific location of the light-transmitting opening 221 is not limited in this embodiment of the present application. The shapes of the first reflector 21 and the second reflector 22 are described in detail above regarding the shape of the reflector 2 and will not be repeated here.

[0056] See also Figure 5 In some embodiments, the middle portion of the first reflector 21 is connected to the top wall 14 or the bottom wall 15 of the housing, and the periphery of the first reflector 21 is spaced apart from the peripheral wall 16. The periphery of the second reflector 22 is connected to the peripheral wall 16 of the housing.

[0057] See also Figure 5In an optional embodiment, the first reflective member 21 and the second reflective member 22 may be alternately stacked. For example, they may be alternately stacked in the order of first reflective member 21 - second reflective member 22 - first reflective member 21. In other optional embodiments, multiple second reflective members 22 may be provided between two first reflective members 21, or multiple first reflective members 21 may be provided between two second reflective members 22. For example, they may be stacked in the order of first reflective member 21 - second reflective member 22 - second reflective member 22 - first reflective member 21. Alternatively, they may be stacked in the order of second reflective member 22 - first reflective member 21 - first reflective member 21 - second reflective member 22.

[0058] In an optional embodiment, the first reflective member 21 and the second reflective member 22 may be fixed to corresponding positions of the housing by gluing, welding, plugging, or the like.

[0059] See also Figure 5 In some embodiments, a reflective structure 19 is formed on the housing protruding toward the accommodating cavity. The outer periphery of the second reflective member 22 is connected to the reflective structure 19. The reflective structure 19 has a third reflective slope 191. The third reflective slope 191 faces the first reflective member 21 or another second reflective member 22 adjacent to the second reflective member 22. By adding the reflective structure 19, the reflection area can be further increased. When the infrared light emitted by the light-emitting member 3 propagates within the accommodating cavity, in addition to being reflected by the reflective member 2, it can also be reflected by the third reflective slope 191. This allows more infrared light to be reflected multiple times within the accommodating cavity, increasing the opportunity for interaction with the gas to be detected, improving the intensity of the infrared light signal received by the detector 4, and thereby enhancing the sensitivity and accuracy of gas detection.

[0060] See also Figure 5 In an optional embodiment, the reflective structure 19 may be a pyramid or a truncated pyramid. The reflective structure 19 may include one, two, three, or other third reflective inclined surfaces 191. When the reflective structure 19 includes two third reflective inclined surfaces 191, both third reflective inclined surfaces 191 may face the first reflective element 21; alternatively, both third reflective inclined surfaces 191 may face the second reflective element 22; alternatively, one third reflective inclined surface 191 faces one first reflective element 21, and the other third reflective inclined surface 191 faces one second reflective element 22.

[0061] In summary, the present embodiment provides a gas detection device 100 that, by adding a reflector 2, increases the optical path, improves the infrared light absorption of the gas under test, and thus enhances detection accuracy. Furthermore, the gas detection device 100 can simultaneously detect the concentrations of multiple gases under test, thereby reducing its size while maintaining effective detection results.

[0062] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0063] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0064] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0065] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0066] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0067] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A gas detection device, characterized in that: include: A housing, wherein the housing is provided with a receiving cavity and an air inlet communicated with the receiving cavity, wherein the air inlet is used to allow the gas to be measured to pass through; a reflector, the reflector being fixedly disposed in the accommodating cavity and being used to separate the accommodating cavity into a first cavity and a second cavity that are connected; a light-emitting element, the light-emitting element being fixedly disposed in the first cavity and configured to emit infrared light; A detector is fixedly arranged in the second cavity, and is used to receive the infrared light reflected by the reflector to detect the concentration of the gas to be measured.

2. The gas detection device according to claim 1, characterized in that The shell includes a top wall, a bottom wall and a peripheral wall that are connected to each other, the peripheral wall is arranged between the top wall and the bottom wall, and at least one of the top wall, the bottom wall and the peripheral wall is provided with the air inlet. The middle part of the reflector is connected to the top wall or the bottom wall, the periphery of the reflector is spaced apart from the peripheral wall, the first cavity is formed between the reflector and the bottom wall, and the second cavity is formed between the reflector and the top wall.

3. The gas detection device according to claim 2, characterized in that: The shell also includes a first inclined wall and a second inclined wall, the first inclined wall is arranged between the top wall and the peripheral wall, the second inclined wall is arranged between the bottom wall and the peripheral wall, the first inclined wall has a first reflecting inclined surface, the second inclined wall has a second reflecting inclined surface, and the first reflecting inclined surface and the second reflecting inclined surface both face the reflecting element.

4. The gas detection device according to claim 2, characterized in that: The detector includes at least one, and the detectors are all arranged on the top wall and are symmetrically arranged about the center of the top wall; and / or, the light-emitting member includes at least one, and the light-emitting member is all arranged on the bottom wall and is symmetrically arranged about the center of the bottom wall; and / or, the air inlet includes at least one, and the air inlet is arranged on the top wall and close to the center of the top wall, and / or, the air inlet is arranged on the bottom wall and close to the center of the bottom wall.

5. The gas detection device according to claim 2, characterized in that: The distance d1 between the reflector and the top wall is equal to the distance d2 between the reflector and the bottom wall 15 .

6. The gas detection device according to claim 2, characterized in that: The distance h between any point on the periphery of the reflector and the peripheral wall is the same.

7. The gas detection device according to claim 1, characterized in that: The reflective members include a plurality of reflective members, all of which are spaced apart from each other and stacked in sequence in the accommodating cavity, wherein one of the reflective members and the cavity wall of the shell form the first cavity, and another reflective member and the cavity wall of the shell form the second cavity.

8. The gas detection device according to claim 7, characterized in that: The reflector includes a first reflector and a second reflector which are stacked and spaced apart from each other, the middle of the first reflector is connected to the shell, the outer periphery of the first reflector is spaced apart from the shell, the middle of the second reflector is penetrated by a light-transmitting opening, and the outer periphery of the second reflector is connected to the shell.

9. The gas detection device according to claim 8, characterized in that: The shell protrudes into the accommodating cavity to form a reflective structure, the outer periphery of the second reflective member is connected to the reflective structure, and the reflective structure has a third reflective slope, which faces the first reflective member adjacent to the second reflective member or another second reflective member.

10. The gas detection device according to any one of claims 1 to 9, characterized in that: The housing is provided with a first mounting groove communicating with the first cavity, the first mounting groove is used to fix the detector, and / or the housing is provided with a second mounting groove communicating with the second cavity, the second mounting groove is used to fix the light-emitting element.

Images