Gas chamber device and gas detection device adopting same

Abstract

The utility model discloses a gas chamber device and a gas detection device adopting the same, which realize conduction between two adjacent gas flow channels through a gas circulation cavity, so that gas to be detected can flow through all the gas flow channels. Detection optical signals are directly reflected through the reflection sealing plate to achieve propagation of the optical signals in the two adjacent airflow channels, the reflection sealing plate and the air chamber body are detachably fastened and connected, the air chamber device is convenient to disassemble and assemble, the airflow channels and the reflection sealing plate are convenient to maintain, structural parts are easy to machine, the effective optical path is increased, and the service life of the air chamber device is prolonged. Therefore, the volume of the detection gas chamber with the same optical path can be smaller.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to a gas chamber device, and also particularly to a gas detection device adopting the gas chamber device. Background Technique

[0002] At present, with the continuous innovation of production technology, the requirements for industrial environmental protection are gradually increasing, the emission concentration of pollution sources is gradually decreasing, and the emission concentrations of sulfur dioxide and nitrogen oxides of each enterprise are basically below 100 mg / m 3 The following makes the environmental protection department put forward higher requirements for the stability and accuracy of the detection of pollutant emission concentrations in industrial sites. At the same time, the portability of detection equipment also needs to be considered. Therefore, it is necessary to achieve a longer optical path within the limited gas chamber space of the detection equipment to improve the detection accuracy. The existing multiple reflection cell is composed of two nearly confocal concave mirrors with equal focal lengths. By increasing the number of round-trip reflections of light in the reflection cell, the optical path far exceeds its physical size. However, the more reflections there are, the greater the light energy loss and the lower the light energy utilization rate. The patent with the publication number CN215218532U proposes a small-volume gas optical absorption cell, which discloses that the reflector is fixedly installed on the inner wall of the wavy gas storage tube. The light beam enters the gas storage tube from the light beam incident end, and then the propagation path of the light beam is changed by the reflector in the gas storage tube, so that the light beam leaves the gas storage tube through the light beam exit end, thereby achieving the purpose of prolonging the propagation time of the light beam in the gas to be measured. Although this device does not require the light beam to make multiple round-trip reflections in the gas storage tube, the pollutants in the gas to be measured will inevitably contaminate the reflector when they come into contact with the reflector for a long time, resulting in a decrease in the reflectivity of the reflector and further a decrease in the accuracy of the measurement results. Therefore, it is necessary to clean the reflector frequently. Since the reflector is fixedly installed on the inner wall of the gas storage tube, it is difficult to remove the reflector from the gas storage tube for cleaning, and only the whole gas optical absorption cell can be cleaned. In this way, there is a problem that the accuracy and authenticity of the measurement results cannot be guaranteed due to incomplete cleaning of the reflector. Content of the Utility Model

[0003] The utility model provides a gas chamber device and a gas detection device adopting the same, which is convenient for the maintenance of the gas chamber, increases the effective optical path, and enables the detection gas chamber with the same optical path to have a smaller volume.

[0004] According to one aspect of the utility model, there is provided an air chamber device, comprising an air chamber body and a reflective sealing plate, wherein the air chamber body is provided with N air flow channels arranged side by side and a gas flow cavity arranged between two adjacent air flow channels and connecting the two adjacent air flow channels, N is a natural number greater than or equal to 2, and the air chamber body is also provided with an air inlet for introducing a gas to be detected, an exhaust port for discharging the gas to be detected, an emission hole for allowing an optical signal to be injected, and a receiving hole for allowing an optical signal to be emitted, the air inlet and the emission hole are connected to the first air flow channel, the exhaust port and the receiving hole are connected to the Nth air flow channel, the propagation direction of the optical signal in the air flow channel is parallel to the length direction of the air flow channel, the reflective sealing plate is located on the side where the gas flow cavity is located and is detachably fastened to the air chamber body, and the reflective sealing plate extends into the gas flow cavity, and is used to reflect the optical signal in one air flow channel to the adjacent air flow channel.

[0005] Furthermore, the reflective sealing plate includes a base and a reflective platform, the base is detachably fastened to the air chamber body, the reflective platform is arranged on a side of the base close to the air chamber body, two opposite inclined surfaces are arranged on the reflective platform, and a reflective film with high reflectivity and corrosion resistance is arranged on the inclined surfaces, so that the light signal in one air flow channel is reflected by the reflective films on the two inclined surfaces and then emitted into the adjacent air flow channel.

[0006] Furthermore, a first sealing member is provided on the contact surface between the reflective sealing plate and the air chamber body.

[0007] Furthermore, a mounting groove is provided on the surface of the reflective sealing plate close to the air chamber body or on the surface of the air chamber body close to the reflective sealing plate, and the first sealing member is arranged in the mounting groove.

[0008] Furthermore, air chamber lenses are installed at the transmitting hole and the receiving hole to enhance the transmittance of the optical signal.

[0009] Furthermore, a second sealing member is installed at the transmitting hole and the receiving hole.

[0010] Furthermore, any one of a gold-plated reflective film, a silver-plated reflective film and a metal fluoride-plated reflective film is provided on the inclined surface.

[0011] In addition, the utility model also provides a gas detection device, comprising a light transmitter, a light receiver and the gas chamber device as described above, wherein the light transmitter is installed at the transmitting hole, and the light receiver is installed at the receiving hole.

[0012] Further, the optical transmitter and the optical receiver are mounted on a circuit board, the circuit board is mounted on a fixed clamping plate, and the fixed clamping plate is mounted on the air chamber body. Through holes are formed in the fixed clamping plate at positions corresponding to the optical transmitter and the optical receiver for the optical transmitter and the optical receiver to pass through.

[0013] Further, a temperature sensor is also mounted on the circuit board for monitoring the temperature of the circuit board.

[0014] The utility model has the following beneficial effects:

[0015] For the air chamber device of the utility model, the conduction between two adjacent air flow channels is realized through the gas flow cavity, so that the gas to be detected can flow through all the air flow channels, and the detection optical signal is directly reflected by the reflection sealing plate to realize the propagation of the optical signal in two adjacent air flow channels. Since the reflection sealing plate 2 is detachably and tightly connected to the air chamber body 1, it is convenient to disassemble and assemble the air chamber device, thus facilitating the maintenance of the air flow channel and the reflection sealing plate. Moreover, the structural parts are easy to process, and the effective optical path is increased, enabling the detection air chamber with the same optical path to have a smaller volume.

[0016] In addition, the gas detection device of the utility model also has the above advantages.

[0017] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages. The following will refer to the drawings to further describe the utility model in detail. Description of the Drawings

[0018] The drawings forming a part of this application are used to provide a further understanding of the utility model. The schematic embodiments and descriptions thereof of the utility model are used to explain the utility model and do not constitute an improper limitation to the utility model. In the drawings:

[0019] Figure 1 is an isometric structural principle schematic diagram of the air chamber device of the preferred embodiment of this application.

[0020] Figure 2 is Figure 1 the exploded structural schematic diagram of

[0021] Figure 3 is the front view structural schematic diagram of the air chamber device of the preferred embodiment of this application.

[0022] Figure 4 is Figure 3 the sectional structural schematic diagram taken along the section B-B.

[0023] Figure 5 is the isometric structural schematic diagram of the gas detection device of another embodiment of this application.

[0024] Figure 6 is Figure 5 the schematic explosion structure diagram of...

[0025] Figure 7 is the schematic explosion structure diagram of the gas detection device according to another embodiment of the present application from another perspective.

[0026] Description of the reference numerals

[0027] 1. Gas chamber body; 2. Reflective sealing plate; 3. First seal; 4. Installation groove; 11. Air flow channel; 12. Gas flow cavity; 13. Air inlet; 14. Exhaust port; 15. Emission hole; 16. Reception hole; 17. Gas chamber lens; 18. Second seal; 21. Base; 22. Reflective table; 23. Inclined surface; 100. Light emitter; 101. Light receiver; 102. Circuit board; 103. Fixed clamping plate; 104. Temperature sensor. Detailed implementation manners

[0028] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0029] Refer to Figures 1 to 4As shown in the figure, a preferred embodiment of the present application provides a gas chamber device, which includes a gas chamber body 1 and a reflection sealing plate 2. An N number of air flow channels 11 arranged side by side are formed in the gas chamber body 1, and a gas flow cavity 12 is provided between two adjacent air flow channels 11 and communicates with the two adjacent air flow channels 11. That is, the gas to be detected in one of the two adjacent air flow channels 11 can flow to the other air flow channel 11 through the gas flow cavity 12. An air inlet 13 for introducing the gas to be detected, an air outlet 14 for discharging the gas to be detected, a transmitting hole 15 for allowing an optical signal to enter, and a receiving hole 16 for allowing the optical signal to exit are further formed in the gas chamber body 1. The air inlet 13 and the transmitting hole 15 are communicated with the first air flow channel 11, and the air outlet 14 and the receiving hole 16 are communicated with the Nth air flow channel 11, where N≥2 and N is a natural number. The propagation direction of the optical signal in each air flow channel 11 is parallel to the length direction of the air flow channel 11. Preferably, the optical signal propagates along the central axis direction of the air flow channel 11. Among them, the air inlet 13 is connected to a gas supply device, and the air outlet 14 is connected to a gas receiving device. The reflection sealing plate 2 is located on the side where the gas flow cavity 12 is located and is detachably and firmly connected to the gas chamber body 1. The reflection sealing plate 2 extends into the gas flow cavity 12 and is used to reflect the optical signal in one air flow channel 11 into the adjacent air flow channel 11. It can be understood that the gas to be detected enters the first air flow channel 11 through the air inlet 13, and at the same time, the optical signal enters the first air flow channel 11 from the transmitting hole 15. The two adjacent air flow channels 11 are conducted through the gas flow cavity 12, so that the gas to be detected flows through all the air flow channels 11 and is discharged from the air outlet 14, while the propagation of the optical signal in the two adjacent air flow channels 11 is realized through the reflection of the reflection sealing plate 2, thereby realizing long optical path detection.

[0030] It can be understood that in the gas chamber device of this embodiment, the conduction between two adjacent air flow channels 11 is realized through the gas flow cavity 12, so that the gas to be detected can flow through all the air flow channels 11, and the detection optical signal is directly reflected by the reflection sealing plate 2 to realize the propagation of the optical signal in the two adjacent air flow channels 11. Since the reflection sealing plate 2 is detachably and firmly connected to the gas chamber body 1, it is convenient to disassemble and assemble the gas chamber device, thus facilitating the maintenance of the air flow channel 11 and the reflection sealing plate 2. Moreover, the structural parts are easy to process, and the effective optical path is increased, so that the detection gas chamber with the same optical path can be made smaller in volume.

[0031] Preferably, two air flow channels 11 arranged side by side along the length direction are provided in the air chamber body 1. The same ends of the two air flow channels 11 are communicated through a gas flow cavity 12, so that the air flow to be detected can flow between the two air flow channels 11. The emission hole 15 and the receiving hole 16 are arranged on the end surface of the air chamber body 1 far from the gas flow cavity 12. The air inlet 13 and the air outlet 14 are opened on two opposite side surfaces of the air chamber body 1 and close to the end surface where the emission hole 15 and the receiving hole 16 are located. The emission hole 15 and the air inlet 13 are communicated with the first air flow channel 11, and the receiving hole 16 and the air outlet 14 are communicated with the second air flow channel 11. Optionally, the emission hole 15 and the receiving hole 16 are both arranged coaxially with the air flow channel 11. The reflection sealing plate 2 is located on the side where the gas flow cavity 12 is located and is detachably and firmly connected to the air chamber body 1, such as by screw connection, bolt connection, interference fit connection, etc. The reflection sealing plate 2 extends into the gas flow cavity 12 and is used to reflect the optical signal in the first air flow channel 11 into the second air flow channel 11. It can be understood that when the number N of the air flow channels 11 is odd, the emission hole 15 and the receiving hole 16 are respectively arranged on two opposite end surfaces of the air chamber body 1; when the number N of the air flow channels 11 is even, the emission hole 15 and the receiving hole 16 are arranged on the same end surface of the air chamber body 1; but regardless of whether the number N of the air flow channels 11 is odd or even, the air inlet 13 needs to be arranged close to the emission hole 15, and the air outlet 14 is arranged close to the receiving hole 16.

[0032] Among them, the reflection sealing plate 2 includes a base 21 and a reflection table 22. The base 21 is detachably and tightly connected to the air chamber body 1. The reflection table 22 is arranged on one side of the base 21 close to the air chamber body 1. The reflection table 22 extends into the gas flow cavity 12. Two opposite inclined surfaces 23 are arranged on the reflection table 22. A reflection film with high reflectivity and corrosion resistance is arranged on the inclined surface 23, so that the optical signal in one air flow channel 11 is reflected by the reflection films on the two inclined surfaces 23 and then enters the adjacent air flow channel 11. It can be understood that the included angle between the two inclined surfaces 23 is 90°, and the incident angle of the optical signal on the inclined surface 23 is 45°, so as to ensure that the propagation directions of the optical signals in the two air flow channels 11 are parallel. Optionally, any one of a gold-plated reflection film, a silver-plated reflection film and a metal fluoride-plated reflection film is arranged on the inclined surface 23. It can be understood that the setting of the base 21 facilitates the disassembly and assembly of the reflection sealing plate 2. By arranging two opposite inclined surfaces 23 on the reflection table 22 and arranging a reflection film with high reflectivity and corrosion resistance on the inclined surface 23, while achieving a high reflectivity of the optical signal, it can be directly in contact with the gas to be detected. The overall structure of the reflection sealing plate 2 is relatively simple, easy to process, and only two opposite smooth inclined surfaces need to be milled on the reflection table 22, and then reflection films are plated on the two smooth inclined surfaces, and the processing process is relatively simple. As another option, the reflection sealing plate 2 can also directly arrange two opposite inclined plates on the base 21. The two inclined plates extend into the gas flow cavity 12, and a reflection film with high reflectivity and corrosion resistance is arranged on the inner surfaces (i.e., the surfaces close to the air flow channels 11) of the two inclined plates.

[0033] Optionally, a first seal 3 is also arranged on the contact surface between the reflection sealing plate 2 and the air chamber body 1, which can prevent the gas to be detected from leaking from the contact surface between the reflection sealing plate 2 and the air chamber body 1, and improves the detection accuracy of the gas concentration. Specifically, an installation groove 4 is formed on the surface of the reflection sealing plate 2 close to the air chamber body 1 or on the surface of the air chamber body 1 close to the reflection sealing plate 2, and the first seal 3 is arranged in the installation groove 4, which is convenient for installing and maintaining the first seal 3. Among them, the first seal 3 can adopt a sealing ring or a sealing washer.

[0034] In addition, air chamber lenses 17 are also installed at the emission hole 15 and the receiving hole 16 for enhancing the transmission of the optical signal. Among them, an antireflection film is plated on the surface of the air chamber lens 17 that does not contact the gas, such as an ultraviolet antireflection film, an infrared antireflection film, etc., and can be specifically selected according to the wavelength of the detected optical signal to improve the transmissivity of the optical signal, which is beneficial to improving the detection accuracy of the gas concentration.

[0035] In addition, a second seal 18 is also installed at the emission hole 15 and the reception hole 16, which can prevent the gas to be detected from leaking from the emission hole 15 and the reception hole 16, improving the detection accuracy of the gas concentration. Optionally, the second seal 18 is disposed on the side of the gas chamber lens 17 close to the air flow channel 11. Wherein, the second seal 18 can be a sealing ring or a sealing washer.

[0036] In addition, as Figures 5 to 7 shown, another embodiment of the present invention further provides a gas detection device, which includes a light emitter 100, a light receiver 101 and the gas chamber device as described above. The light emitter 100 is installed at the emission hole 15, and the light receiver 101 is installed at the reception hole 16. Wherein, the light emitter 100 and the light receiver 101 are installed on a circuit board 102, the circuit board 102 is installed on a fixed clamping plate 103, and the fixed clamping plate 103 is installed on the gas chamber body 1. Through holes are formed in the fixed clamping plate 103 at the corresponding positions of the light emitter 100 and the light receiver 101 for the light emitter 100 and the light receiver 101 to pass through. By integrating the light emitter 100 and the light receiver 101 on the circuit board 102, on the one hand, it is convenient for installation, on the other hand, integration is achieved, and the circuit board 102 is installed on the gas chamber body 1 through the fixed clamping plate 103, ensuring the installation stability of the circuit board 102. It can be understood that when the emission hole 15 and the reception hole 16 are respectively disposed on two opposite end faces of the gas chamber body 1, circuit boards 102 and fixed clamping plates 103 need to be provided at both opposite ends of the gas chamber body 1 to facilitate the installation of the light emitter 100 and the light receiver 101 respectively. When the emission hole 15 and the reception hole 16 are disposed on the same end face of the gas chamber body 1, the light emitter 100 and the light receiver 101 can also be respectively disposed on two small circuit boards 102. Of course, in order to improve the integration degree, it is preferably to integrate the light emitter 100 and the light receiver 101 on a large circuit board 102.

[0037] In addition, a temperature sensor 104 is also installed on the circuit board 102 for monitoring the temperature of the circuit board 102. It can be understood that since the light receiver 101 is sensitive to temperature and the light emitter 100 is integrated on the circuit board 102 as a light source, the temperature of the circuit board 102 is relatively high. In order to ensure the accuracy of the detection result and prevent the electronic components from being damaged due to excessive temperature, the temperature of the circuit board 102 is monitored in real time by the temperature sensor 104.

[0038] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An air chamber device, characterized in that, It includes an air chamber body (1) and a reflection sealing plate (2). Inside the air chamber body (1), N air flow channels (11) arranged side by side are provided, and a gas circulation cavity (12) is arranged between two adjacent air flow channels (11) and communicates with the two adjacent air flow channels (11). N is a natural number greater than or equal to 2. An air inlet (13) for introducing the gas to be detected, an air outlet (14) for discharging the gas to be detected, a transmitting hole (15) for allowing an optical signal to enter, and a receiving hole (16) for allowing an optical signal to exit are further provided on the air chamber body (1). The air inlet (13) and the transmitting hole (15) communicate with the first air flow channel (11), and the air outlet (14) and the receiving hole (16) communicate with the Nth air flow channel (11). The propagation direction of the optical signal in the air flow channel (11) is parallel to the length direction of the air flow channel (11). The reflection sealing plate (2) is located on the side where the gas circulation cavity (12) is located and is detachably and firmly connected to the air chamber body (1). The reflection sealing plate (2) extends into the gas circulation cavity (12) and is used to reflect the optical signal in one air flow channel (11) into the adjacent air flow channel (11).

2. The air chamber device according to claim 1, characterized in that, The reflection sealing plate (2) includes a base (21) and a reflection table (22). The base (21) is detachably and firmly connected to the air chamber body (1). The reflection table (22) is arranged on the side of the base (21) close to the air chamber body (1). Two opposite inclined surfaces (23) are arranged on the reflection table (22), and a reflection film with high reflectivity and corrosion resistance is arranged on the inclined surfaces (23), so that the optical signal in one air flow channel (11) is reflected by the reflection films on the two inclined surfaces (23) and then enters the adjacent air flow channel (11).

3. The air chamber device according to claim 1, characterized in that, A first sealing member (3) is further arranged on the contact surface between the reflection sealing plate (2) and the air chamber body (1).

4. The air chamber device according to claim 3, wherein, An installation groove (4) is formed on the surface of the reflection sealing plate (2) close to the air chamber body (1) or on the surface of the air chamber body (1) close to the reflection sealing plate (2), and the first sealing member (3) is arranged in the installation groove (4).

5. The air chamber device according to claim 1, wherein, Air chamber lenses (17) are further installed at the transmitting hole (15) and the receiving hole (16) for enhancing the transmission of the optical signal.

6. The air chamber device according to claim 1, characterized in that Second sealing members (18) are further installed at the transmitting hole (15) and the receiving hole (16).

7. The air chamber device according to claim 2, wherein, Any one of a gold-plated reflection film, a silver-plated reflection film, and a metal fluoride reflection film is arranged on the inclined surface (23).

8. A gas detection device, characterized in that, It includes an optical transmitter (100), an optical receiver (101), and the air chamber device according to any one of claims 1 to 7. The optical transmitter (100) is installed at the transmitting hole (15), and the optical receiver (101) is installed at the receiving hole (16).

9. The gas detection device according to claim 8, wherein, The light emitter (100) and the light receiver (101) are mounted on a circuit board (102), the circuit board (102) is mounted on a fixed clamping plate (103), and the fixed clamping plate (103) is mounted on the air chamber body (1). Through holes are formed in the fixed clamping plate (103) at positions corresponding to the light emitter (100) and the light receiver (101) for the light emitter (100) and the light receiver (101) to pass through.

10. The gas detection device according to claim 9, characterized in that, A temperature sensor (104) is also mounted on the circuit board (102) for monitoring the temperature of the circuit board (102).

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