Infrared sensor for detecting carbon dioxide concentration in a pipeline and working method

Abstract

The present application belongs to the technical field of measurement, and particularly relates to gas analysis, and especially relates to an infrared sensor for detecting carbon dioxide concentration in a pipeline and a working method thereof. The infrared sensor for detecting carbon dioxide concentration in the pipeline is used to make the gas enter a gas chamber through a first flow channel when the gas flow rate is low, and the gas enters the gas chamber through a second flow channel when the gas flow rate is high. The length of the gas flow in the second flow channel is greater than the length of the gas flow in the first flow channel. Thus, the gas flow distance is reduced when the gas flow rate is low, and the gas flow distance is increased when the gas flow rate is high. The gas flow rate into the gas chamber is avoided from being too high, and the detection accuracy of the carbon dioxide is ensured.

Description

Technical Field

[0001] This invention belongs to the field of measurement technology, specifically relating to gas analysis, and more particularly to an infrared sensor and its working method for detecting carbon dioxide concentration in pipelines. Background Technology

[0002] Currently, infrared carbon dioxide sensor probes are gas detection devices based on non-dispersive infrared technology, which detect the concentration of carbon dioxide in the environment by measuring the absorption of infrared light at a specific wavelength. After the infrared light emitted by the light source passes through the gas chamber, the unabsorbed light is detected by the detector, and the carbon dioxide concentration is calculated based on the degree of signal attenuation. During coal mining, a large amount of carbon dioxide gas is generated. Therefore, it is necessary to monitor the carbon dioxide concentration in real time to prevent its accumulation. In related technologies, the air inlet of the carbon dioxide sensor is usually directly located at the bottom of the gas chamber, allowing gas to flow directly into the chamber. However, this method has some shortcomings when dealing with carbon dioxide sensors installed in ventilation ducts. Since the gas flow rate in the duct is constantly changing, problems arise when the gas flow rate is low or high. If the size of the air inlet is increased to avoid insufficient air intake at low flow rates, it will cause the gas to directly impact the optical mirror when the flow rate suddenly increases. If the size of the air inlet is decreased to avoid impact problems at high flow rates, it cannot handle the situation where the air intake is slow when the flow rate decreases.

[0003] Therefore, to address the technical problem of how changes in gas flow rate affect the intake volume in the gas chamber and thus carbon dioxide detection, a new infrared sensor and operating method for detecting carbon dioxide concentration in pipelines need to be designed.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0005] This disclosure provides at least one infrared sensor and its operating method for detecting carbon dioxide concentration in pipelines.

[0006] In a first aspect, embodiments of this disclosure provide an infrared sensor for detecting carbon dioxide concentration in a pipeline, comprising: The housing has an air chamber inside and an air inlet at the bottom. The housing has a first flow channel and a second flow channel, both of which are connected to the air chamber. Both the first flow channel and the second flow channel are connected to the air inlet; The air inlet is equipped with a moving mechanism, which is configured to switch between the first flow channel and the second flow channel. When the gas flow rate is low, the gas enters the air chamber through the first flow channel, and when the gas flow rate is high, the gas enters the air chamber through the second flow channel. The length of the gas flow in the second flow channel is greater than the length of the gas flow in the first flow channel.

[0007] In one optional embodiment, the moving mechanism includes: a movable sleeve; The movable sleeve is slidably disposed within the air inlet; The bottom surface of the movable sleeve is open; The movable sleeve has a pair of first through holes and a second through hole on its side wall, with the second through hole located above the first through hole; A spring is provided between the top surface of the movable sleeve and the inner top surface of the air inlet.

[0008] In one optional embodiment, the first flow channel has two air intake positions on the inner wall of the air inlet, and the air intake positions correspond to the first through hole; The outlet of the first flow channel is located in the middle of the first flow channel, so as to communicate with the air chamber through the outlet. When the gas flow rate is low, the inlet position of the first flow channel is aligned with the corresponding first through hole, the second through hole is blocked by the moving sleeve, and the gas enters the gas chamber through the first flow channel.

[0009] In one optional implementation, the second flow channel has an air intake position on the inner wall of the air inlet, and the air intake position corresponds to the second through hole; The outlet of the second flow channel is located on the inner wall of the air chamber; When the gas flow rate is high, the gas pushes the moving sleeve upward, aligning the second through hole with the air inlet position of the second flow channel. At this time, the air inlet position of the first flow channel is blocked by the moving sleeve, and the gas enters the gas chamber through the second flow channel.

[0010] In one alternative embodiment, the distance the gas travels from the inlet position of the second flow channel to the outlet position of the second flow channel is greater than the distance the gas travels from the inlet position of the first flow channel to the outlet position of the first flow channel.

[0011] In one optional embodiment, a circuit board is disposed inside the housing, and the circuit board is electrically connected to an infrared light source; The infrared light source is disposed on the inner top surface of the air chamber; The infrared light source is adapted to emit infrared light into the air chamber.

[0012] In one alternative embodiment, the circuit board is electrically connected to a detector; The detector is positioned above the gas chamber; The detector is adapted to detect the gas in the gas chamber after infrared light irradiation in order to obtain the carbon dioxide concentration.

[0013] Secondly, embodiments of this disclosure also provide a detection system, including: The aforementioned infrared sensor for detecting carbon dioxide concentration in pipelines is used to detect carbon dioxide concentration.

[0014] Thirdly, this disclosure also provides a method for operating the infrared sensor used for detecting carbon dioxide concentration in a pipeline as described above, comprising: When the gas flow rate is low, the gas enters the gas chamber through the first flow channel; when the gas flow rate is high, the gas enters the gas chamber through the second flow channel. Furthermore, the length of the gas flow in the second flow channel is greater than the length of the gas flow in the first flow channel.

[0015] In one alternative implementation, the gas in the chamber after infrared light irradiation is detected by a detector to obtain the carbon dioxide concentration.

[0016] The beneficial effect of this invention is that the infrared sensor for detecting carbon dioxide concentration in pipelines allows gas to enter the gas chamber through a first flow channel when the gas flow rate is low, and through a second flow channel when the gas flow rate is high. Furthermore, the length of gas flow in the second flow channel is greater than the length of gas flow in the first flow channel. This reduces the gas flow distance when the gas flow rate is slow and increases the gas flow distance when the gas flow rate is high, thus preventing the gas from flowing into the gas chamber at too high a speed and ensuring the accuracy of carbon dioxide detection.

[0017] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0018] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1A schematic diagram of the structure of an infrared sensor for detecting carbon dioxide concentration in a pipeline, provided in an embodiment of this disclosure; Figure 2 A cross-sectional view of an infrared sensor for detecting carbon dioxide concentration in a pipeline, provided as an embodiment of this disclosure; Figure 3 A cross-sectional view of a first flow channel provided in an embodiment of this disclosure; Figure 4 A cross-sectional view of a second flow channel provided in an embodiment of this disclosure; Figure 5 This is a schematic diagram of a moving mechanism provided in an embodiment of the present disclosure.

[0021] In the picture: 1. Casing; 11. Air chamber; 12. Air inlet; First flow channel 2; Second flow channel 3; Moving mechanism 4, moving sleeve 41, first through hole 42, second through hole 43, spring 44; Circuit board 5, infrared light source 51, detector 52. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0024] The air inlet of a carbon dioxide sensor is usually located directly at the bottom of the air chamber, allowing gas to flow directly into the chamber. However, this method has some shortcomings when dealing with carbon dioxide sensors installed in ventilation ducts. Since the gas flow rate in the duct is constantly changing, problems arise when the gas flow rate is low or high. If the size of the air inlet is increased to avoid insufficient air intake when the gas flow rate is low, it will cause the gas to directly impact the optical lens when the flow rate suddenly increases. If the size of the air inlet is decreased to avoid impact problems when the gas flow rate is high, it cannot cope with the situation where the air intake is slow when the flow rate is low.

[0025] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0026] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] like Figure 1 and Figure 2 As shown, at least one disclosed embodiment provides an infrared sensor for detecting carbon dioxide concentration in a pipeline, comprising: a housing 1, wherein a gas chamber 11 is formed inside the housing 1, and an air inlet 12 is formed at the bottom of the housing 1; a first flow channel 2 and a second flow channel 3 are formed inside the housing 1, both of which are connected to the gas chamber 11; both the first flow channel 2 and the second flow channel 3 are connected to the air inlet 12; a moving mechanism 4 is provided inside the air inlet 12, the moving mechanism 4 being configured to switch between the first flow channel 2 and the second flow channel 3, i.e., when the gas flow rate is low, the gas enters the gas chamber 11 through the first flow channel 2, and when the gas flow rate is high, the gas enters the gas chamber 11 through the second flow channel 3, and the length of gas flow in the second flow channel 3 is greater than the length of gas flow in the first flow channel 2, thereby reducing the gas flow distance when the gas flow rate is slow and increasing the gas flow distance when the gas flow rate is high, avoiding excessively fast gas flow into the gas chamber 11, and ensuring the detection accuracy of carbon dioxide.

[0028] In this embodiment, when the gas flow rate is too fast, the gas flow distance is increased to reduce the gas speed when it enters the gas chamber 11.

[0029] like Figure 5As shown, in an optional embodiment, the moving mechanism 4 includes: a moving sleeve 41; the moving sleeve 41 is slidably disposed within the air inlet 12; the bottom surface of the moving sleeve 41 is open; a pair of first through holes 42 and a second through hole 43 are provided on the side wall of the moving sleeve 41, the second through hole 43 being located above the first through hole 42; a spring 44 is provided between the top surface of the moving sleeve 41 and the inner top surface of the air inlet 12.

[0030] like Figure 3 As shown, in one optional embodiment, the first flow channel 2 has two air inlet positions on the inner wall of the air inlet 12, and the air inlet positions correspond to the first through hole 42; the air outlet position of the first flow channel 2 is located in the middle position of the first flow channel 2 so as to communicate with the air chamber 11 through the air outlet position; when the gas flow rate is low, the air inlet position of the first flow channel 2 is aligned with the corresponding first through hole 42, the second through hole 43 is blocked by the movable sleeve 41, and the gas enters the air chamber 11 through the first flow channel 2.

[0031] In this embodiment, the outlet positions of the first flow channel 2 and the second flow channel 3 are both located on the side wall of the gas chamber 11, so that when the gas enters the gas chamber 11, its flow direction will not flow directly towards the infrared light source 51 and the detector 52, thus avoiding the gas from impacting the infrared light source 51 and the detector 52 and ensuring the detection accuracy of carbon dioxide.

[0032] like Figure 4 As shown, in one optional embodiment, the second flow channel 3 has an air intake position on the inner wall of the air inlet 12, which corresponds to the second through hole 43; the air outlet position of the second flow channel 3 is located on the inner wall of the air chamber 11; when the gas flow rate is high, the gas pushes the moving sleeve 41 to move upward, and the second through hole 43 is aligned with the air intake position of the second flow channel 3. At this time, the air intake position of the first flow channel 2 is blocked by the moving sleeve 41, and the gas enters the air chamber 11 through the second flow channel 3.

[0033] In this embodiment, the shape of the first flow channel 2 is approximately circular. The outlet of the first flow channel 2 can be located in the middle of the circle. The distance from the inlet to the outlet of the first flow channel 2 can be approximately a semicircle. There are two inlet positions for the first flow channel 2. The gas only needs to flow through half of the complete shape of the first flow channel 2 to flow out of the first flow channel 2.

[0034] In this embodiment, the shape of the second flow channel 3 is approximately circular. The shape of the second flow channel 3 can be similar to that of the first flow channel 2. There is only one air inlet position in the second flow channel 3. The gas needs to flow completely through the second flow channel 3 before it can flow out from the air outlet position of the second flow channel 3, so that the gas flows a longer distance when it flows through the second flow channel 3.

[0035] In one alternative embodiment, the distance the gas travels from the inlet position of the second flow channel 3 to the outlet position of the second flow channel 3 is greater than the distance the gas travels from the inlet position of the first flow channel 2 to the outlet position of the first flow channel 2.

[0036] In this embodiment, in the initial state, the first through hole 42 is aligned with the corresponding air inlet position of the first flow channel 2. At this time, the external gas flow rate is low, the moving sleeve 41 does not move, and the gas enters the gas chamber 11 through the first flow channel 2. When the external gas flow rate gradually increases, the gas pushes the moving sleeve 41 to move. When the moving sleeve 41 moves to the highest position, the second through hole 43 is aligned with the air inlet position of the second flow channel 3. At this time, the gas enters the gas chamber 11 through the second flow channel 3. During the movement of the moving sleeve 41, the first through hole 42... The alignment of the hole 42 with the first flow channel 2 changes from complete alignment to partial alignment. Finally, the air inlet position of the first flow channel 2 is blocked by the moving sleeve 41. The alignment of the second through hole 43 with the air inlet position of the second flow channel 3 changes from the second through hole 43 being completely blocked by the moving sleeve 41 to the second through hole 43 being partially aligned with the air inlet position of the second flow channel 3, until the second through hole 43 is completely aligned with the air inlet position of the second flow channel 3. During the movement of the moving sleeve 41, gas can enter the gas chamber 11 through the first flow channel 2 and / or the second flow channel 3.

[0037] like Figure 2 As shown, in one optional embodiment, a circuit board 5 is provided inside the housing 1, and the circuit board 5 is electrically connected to an infrared light source 51; the infrared light source 51 is disposed on the inner top surface of the air chamber 11; the infrared light source 51 is adapted to emit infrared light into the air chamber 11.

[0038] like Figure 2 As shown, in an optional embodiment, the circuit board 5 is electrically connected to a detector 52; the detector 52 is disposed above the gas chamber 11; the detector 52 is adapted to detect the gas in the gas chamber 11 after infrared light irradiation in order to obtain the carbon dioxide concentration.

[0039] At least one other disclosed embodiment also provides a detection system, comprising: The aforementioned infrared sensor for detecting carbon dioxide concentration in pipelines is used to detect carbon dioxide concentration.

[0040] At least one other disclosed embodiment also provides a method of operation using the infrared sensor described above for detecting carbon dioxide concentration in a pipeline, comprising: When the gas flow rate is low, the gas enters the gas chamber 11 through the first flow channel 2. When the gas flow rate is high, the gas enters the gas chamber 11 through the second flow channel 3. The length of the gas flow in the second flow channel 3 is greater than the length of the gas flow in the first flow channel 2.

[0041] In one alternative implementation, the gas inside the gas chamber 11 after infrared light irradiation is detected by detector 52 to obtain the carbon dioxide concentration.

[0042] In summary, the infrared sensor for detecting carbon dioxide concentration in pipelines achieves this by having gas enter the gas chamber 11 through the first flow channel 2 when the gas flow rate is low, and through the second flow channel 3 when the gas flow rate is high. Furthermore, the length of gas flow in the second flow channel 3 is greater than the length of gas flow in the first flow channel 2. This reduces the gas flow distance when the gas flow rate is low and increases the gas flow distance when the gas flow rate is high, thus maintaining a stable gas flow rate into the gas chamber 11 even when the gas flow rate changes, thereby ensuring the accuracy of carbon dioxide detection.

[0043] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0044] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0045] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature and another element or feature illustrated in the figures. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0046] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. An infrared sensor for detecting carbon dioxide concentration in a pipeline, characterized in that, include: The housing (1) has an air chamber (11) inside and an air inlet (12) at the bottom. The shell (1) has a first flow channel (2) and a second flow channel (3) inside, and both the first flow channel (2) and the second flow channel (3) are connected to the air chamber (11); The first flow channel (2) and the second flow channel (3) are both connected to the air inlet (12); The air inlet (12) is provided with a moving mechanism (4), which is configured to switch between the first flow channel (2) and the second flow channel (3). That is, when the gas flow rate is low, the gas enters the air chamber (11) through the first flow channel (2), and when the gas flow rate is high, the gas enters the air chamber (11) through the second flow channel (3). The length of the gas flowing in the second flow channel (3) is greater than the length of the gas flowing in the first flow channel (2).

2. The infrared sensor for detecting carbon dioxide concentration in a pipeline as described in claim 1, characterized in that: The moving mechanism (4) includes: a moving sleeve (41); The movable sleeve (41) is slidably disposed within the air inlet (12); The bottom surface of the movable sleeve (41) is open; The movable sleeve (41) has a pair of first through holes (42) and a second through hole (43) on its side wall, with the second through hole (43) located above the first through hole (42); A spring (44) is provided between the top surface of the movable sleeve (41) and the inner top surface of the air inlet (12).

3. The infrared sensor for detecting carbon dioxide concentration in a pipeline as described in claim 2, characterized in that: The first flow channel (2) has two air intake positions on the inner wall of the air inlet (12), and the air intake positions correspond to the first through hole (42); The outlet of the first flow channel (2) is located in the middle of the first flow channel (2) so as to communicate with the air chamber (11) through the outlet. When the gas flow rate is low, the gas inlet position of the first flow channel (2) is aligned with the corresponding first through hole (42), the second through hole (43) is blocked by the moving sleeve (41), and the gas enters the gas chamber (11) through the first flow channel (2).

4. The infrared sensor for detecting carbon dioxide concentration in a pipeline as described in claim 3, characterized in that: The second flow channel (3) has an air intake position on the inner wall of the air inlet (12), and the air intake position corresponds to the second through hole (43); The outlet of the second flow channel (3) is located on the inner wall of the air chamber (11); When the gas flow rate is high, the gas pushes the moving sleeve (41) to move upward, and the second through hole (43) is aligned with the air inlet position of the second flow channel (3). At this time, the air inlet position of the first flow channel (2) is blocked by the moving sleeve (41), and the gas enters the gas chamber (11) through the second flow channel (3).

5. The infrared sensor for detecting carbon dioxide concentration in a pipeline as described in claim 4, characterized in that: The distance that the gas travels from the inlet position of the second channel (3) to the outlet position of the second channel (3) is greater than the distance that the gas travels from the inlet position of the first channel (2) to the outlet position of the first channel (2).

6. The infrared sensor for detecting carbon dioxide concentration in a pipeline as described in claim 1, characterized in that: A circuit board (5) is provided inside the housing (1), and an infrared light source (51) is electrically connected to the circuit board (5). The infrared light source (51) is disposed on the inner top surface of the air chamber (11); The infrared light source (51) is adapted to emit infrared light into the air chamber (11).

7. The infrared sensor for detecting carbon dioxide concentration in a pipeline as described in claim 6, characterized in that: The circuit board (5) is electrically connected to a detector (52); The detector (52) is positioned above the air chamber (11); The detector (52) is adapted to detect the gas in the gas chamber (11) after infrared light irradiation in order to obtain the carbon dioxide concentration.

8. A detection system, characterized in that, include: The infrared sensor for detecting carbon dioxide concentration in a pipeline as described in any one of claims 1-7 is used to detect the carbon dioxide concentration.

9. A method for operating an infrared sensor for detecting carbon dioxide concentration in a pipeline as described in claim 1, characterized in that, include: When the gas flow rate is low, the gas enters the gas chamber (11) through the first flow channel (2). When the gas flow rate is high, the gas enters the gas chamber (11) through the second flow channel (3). The length of the gas flow in the second flow channel (3) is greater than the length of the gas flow in the first flow channel (2).

10. The working method as described in claim 9, characterized in that: The gas in the gas chamber (11) after infrared light irradiation is detected by the detector (52) to obtain the carbon dioxide concentration.

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