Equipment for detecting moisture content in gases

Abstract

The present invention provides a device for detecting the moisture content in gas, comprising: a base; a first pipeline arranged on the base, the first pipeline is used to form a first channel for the gas to be tested to circulate, the first channel includes a first area; a moisture detection device is arranged on the first pipeline, the moisture detection device can detect the moisture content of the gas to be tested located in the first area; a second pipeline arranged on the base, the second pipeline is used to form a second channel for the dry gas to circulate, the second channel is fluidly connected to the first area of ​​the first channel; and one or more switch elements arranged on the first pipeline and / or the second pipeline, the switch element is configured to make the first channel and the second channel alternately turned on or off; wherein, when the first channel is closed by the switch element, the dry gas circulated in the second channel can dry the moisture in the first area. The present invention can improve the detection accuracy of the moisture content in the gas to be tested.

Description

Technical Field

[0001] The invention relates to the technical field of gas detection, and in particular to a device for measuring the moisture content in gas. Background Art

[0002] The test methods for moisture content in gas include offline test methods and online test methods (also known as "in-situ detection methods"). For offline test methods, the sample collection process and the moisture content test process are carried out step by step. Taking the aerosol generated when a cigarette is inhaled as an example, a filter is first used to capture the moisture in the aerosol, and then the moisture content captured by the filter is tested (for example, extraction, filtration and other steps to test the moisture content captured by the filter) to finally obtain the moisture content in the aerosol. In the offline test method, sample collection and moisture content testing are carried out asynchronously, the detection time is relatively long, the test results are greatly affected by human factors, and the dynamic changes in the moisture content in the gas cannot be detected.

[0003] Online detection can improve this situation. In the online detection method, during the flow of the gas to be tested, the moisture content in the gas to be tested is detected in real time by a detection device (for example, an optical detection device). Therefore, not only is the detection efficiency high, but the dynamic changes of the moisture content in the gas can also be detected.

[0004] However, there may be residual moisture from the last detection process in the circulation pipeline of the gas to be tested, which will affect the detection accuracy of the moisture content in the gas. Summary of the invention

[0005] The embodiments of the present invention provide a device for detecting the moisture content in gas, which is used to solve the above-mentioned problems in the prior art.

[0006] An embodiment of the present application provides a device for detecting the moisture content in a gas, comprising: a base; a first pipe arranged on the base, the first pipe being used to form a first channel for the gas to be tested to flow, the first channel comprising a first area; a moisture detection device being arranged on the first pipe, and when the gas to be tested flows through the first area, the moisture detection device can detect the moisture content of the gas to be tested located in the first area; a second pipe arranged on the base, the second pipe being used to form a second channel for the dry gas to flow, the second channel being fluidly connected to the first area of ​​the first channel; and a switch element arranged on the first pipe and / or the second pipe, the switch element being configured to enable the first channel and the second channel to be alternately turned on or off; wherein, when the first channel is closed by the switch element, the dry gas flowing in the second channel can dry the moisture in the first area.

[0007] In some embodiments, the switch element includes a first switch element connected to a first pipeline and a second pipeline; by controlling the position of a valve core of the first switch element, the first switch element can be alternately in a first state and a second state; wherein, when the first switch element is in the first state, the first channel is connected and the second channel is closed; when the first switch element is in the second state, the first channel is closed and the second channel is connected.

[0008] In some embodiments, the first switch element is a two-position three-way valve.

[0009] In some embodiments, the switch element further includes a second switch element connected to the first pipeline, and the second switch element is used to alternately open and close the second channel.

[0010] In some embodiments, the switch element is further configured to allow the gas to be measured and the dry gas to flow through the first region in opposite directions.

[0011] In some embodiments, the switching element further includes a first one-way valve disposed on the first pipeline, and a second one-way valve disposed on the second pipeline; wherein the first one-way valve is configured to allow the gas to be tested to flow in a first direction in the first region, and the second one-way valve is configured to allow the dry gas to flow in a second direction opposite to the first direction in the first region.

[0012] In some embodiments, the gas to be detected is an aerosol generated when an aerosol-forming article is inhaled.

[0013] In some embodiments, in the flow direction of the gas to be tested, the upstream end of the first pipe is connected to the aerosol-forming article, and the downstream end of the first pipe is connected to the smoking machine.

[0014] In some embodiments, a filter is provided at the upstream end of the first pipeline, and the filter is used to filter solid particles in the gas to be tested.

[0015] In some embodiments, the drying gas is a combination of one or more of nitrogen, argon, helium, and hydrogen.

[0016] The detection device provided in the embodiment of the present application can realize the alternating opening and closing of the first channel and the second channel. In this way, the dry gas flowing in the second channel dries the moisture in the first area, so that the moisture content in the gas to be detected by the moisture detection device is the real moisture content in the gas to be detected, and will not be affected by the residual moisture, so it can have a higher detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The structure of the detection device provided in the embodiment of the present application is shown in FIG. Figure 1 (the first channel is on);

[0018] Figure 2 The structure of the detection device provided in the embodiment of the present application is shown in FIG. Figure 2 (Second channel is on). DETAILED DESCRIPTION

[0019] The following specific embodiments illustrate the implementation of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this invention are limited to this implementation. On the contrary, the purpose of introducing the invention in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description.

[0020] An embodiment of the present invention provides a detection device for detecting the moisture content in a gas to be tested. Hereinafter, an aerosol (hereinafter referred to as "aerosol") generated when an aerosol-forming article (e.g., ordinary cigarettes, heat-not-burn products, electronic cigarettes, etc.) is inhaled is used as an example of a gas to be tested, but the present invention is not limited thereto. In other embodiments, the gas to be tested may be other gases whose moisture content needs to be detected, for example, fuel gas, sulfur hexafluoride gas (commonly used as an arc extinguishing medium in high-voltage circuit breakers), etc.

[0021] refer to Figure 1 and Figure 2 The detection device 1 includes a base 10, and a first pipe 20 and a second pipe 30 mounted on the base 10. The base 10 can be implemented as a closed shell structure, an open base structure, etc., which is not limited in this embodiment, as long as it can be used to support the first pipe 20 and the second pipe 30.

[0022] The first pipe 20 is used to form a first channel 20a for the gas to be measured to flow. Figure 1 , the structure of the first pipe 20 and the flow path of the aerosol in the first channel 20a are shown by arrows. Figure 1 When the aerosol flows in the first channel 20a, it flows through the first region M ( Figure 1The first pipe 20 is provided with a moisture detection device 40. When the aerosol flows through the first region M, the moisture content in the aerosol in the first region M can be detected in real time by the moisture detection device 40. That is, in this embodiment, the detection device 1 detects the moisture content in the aerosol by an online detection method. Therefore, the dynamic change of the moisture content in the aerosol can be detected in real time, and the detection efficiency is relatively high.

[0023] The moisture detection device 40 can be implemented as an optical detection device. When the moisture content in the aerosol in the first region M is different, the aerosol has different optical properties (for example, infrared light radiation properties). Therefore, by detecting the optical properties of the aerosol, the moisture content in the aerosol can be obtained. In order to improve the detection accuracy of the optical detection device, a quartz tube is used for the pipe wall of the first region M. Other details of the optical detection device can refer to the introduction in the prior art and will not be repeated here.

[0024] The second pipe 30 is used to form a second channel 30a for the drying gas to flow. Figure 2 In the figure, the structure of the second pipe 30 and the flow path of the dry gas in the second channel 30a are shown by arrows. Here, "dry gas" is a gas that does not contain water. In this embodiment, the dry gas is specifically nitrogen. Since nitrogen is chemically stable and easy to obtain, when nitrogen is used as a dry gas, it can not only reduce costs but also have sufficient safety. However, the present invention is not limited to this. In other embodiments, the dry gas can be other gases, such as hydrogen, an inert gas (for example, helium, argon, etc.), or a combination of the above-mentioned multiple dry gases.

[0025] refer to Figure 2 , the second channel 30a and the first region M of the first channel 20a ( Figure 2 In other words, when the dry gas flows in the second channel 30a, it will also flow through the first region M. When the dry gas flows through the first region M, the moisture in the first region M can be dried by air circulation. Here, the moisture in the first region M includes the moisture in the air of the first region M and the moisture on the pipe wall corresponding to the first region M. In addition, it can be understood that when the dry gas flows through the first region M, the solid particles remaining in the first region M can also be cleaned.

[0026] In addition, the detection device 1 further includes one or more switch elements arranged on the first pipe 20 and / or the second pipe 30 (the specific arrangement of the switch elements is described below). The switch elements are configured to enable the first channel 20a and the second channel 30a to be alternately turned on and off. That is, through the action of the switch elements, when the first channel 20a is turned on, the second channel 30a can be turned off; when the first channel 20a is turned off, the second channel 30a can be turned on.

[0027] For example, under the action of the switch element, the first channel 20a is firstly turned on. At this time, the aerosol can flow in the first channel 20a. When the aerosol flows through the first region M, the moisture content in the aerosol in the first region M can be detected by the moisture detection device 40. Since there is moisture in the aerosol, when the aerosol flows through the first region M, the moisture will inevitably remain in the first region M.

[0028] After the detection is completed, the first channel 20a is closed by the switch element, and the second channel 30a is opened. At this time, the dry gas can flow in the second channel 30a. Since the second channel 30a is fluidically connected to the first region M of the first channel 20a, when the dry gas flows in the second channel 30a, it can flow through the first region M, so that the moisture remaining in the first region M can be dried.

[0029] In this way, when the first channel 20a is opened again, the first region M has been dried (there is no residual moisture in the aerosol from the last time). At this time, the moisture content in the aerosol detected by the moisture detection device 40 is the real moisture content in the aerosol, and will not be affected by the residual moisture from the last time, so it can have a higher detection accuracy.

[0030] The following combination Figure 1 and Figure 2 The configuration of the switch element in this embodiment is described in detail. Figure 1 and Figure 2 , the detection device 1 includes a first switch element 51 connected to the first pipeline 20 and the second pipeline 30. In this embodiment, the first switch element 51 is specifically a two-position three-way valve, wherein the "three-way" of the two-position three-way valve means that the valve has three pipeline interfaces, specifically port A, port B and port P; the "two positions" of the two-position three-way valve means that the valve has two working states, namely the first state and the second state. Specifically, by adjusting the position of the valve core of the two-position three-way valve, the two-position three-way valve can be placed in the first state or the second state. When the two-position three-way valve is in the first state S1 ( Figure 1 When the two-position three-way valve is in the second state S2 ( Figure 2 In the state shown), port A and port P are connected, and port A and port B are disconnected.

[0031] refer to Figure 1 and Figure 2 , the first pipeline 20 is connected to the A port and the B port of the two-position three-way valve 51, and the second pipeline 30 is connected to the A port and the P port of the two-position three-way valve 51 (that is, the common section of the first pipeline 20 and the second pipeline 30 is connected to the A port). Thus, when the two-position three-way valve 51 is in the first state S1, the first channel 20a is turned on and the second channel 30a is closed; when the two-position three-way valve 51 is in the second state S2, the first channel 20a is closed and the second channel 30a is turned on. That is to say, by setting the two-position three-way valve, the alternating conduction and closing of the first channel 20a and the second channel 30a can be realized in a simple structural form. It should be noted that in this embodiment, the two-position three-way valve is used as an example of the first switch element 51, but the present invention is not limited thereto. In other embodiments, the first switch element 51 can be implemented as other switch elements, for example, a two-position four-way valve, as long as the first state S1 and the second state S2 can be alternately provided.

[0032] In order to improve the stability of the gas path, the detection device 1 further includes a second switch element 52 connected to the first pipeline 20. The second switch element 52 is used to alternately open or close the first channel 20a. Figure 1 In this embodiment, the second switch element 52 is implemented as a two-position two-way valve, which includes two pipeline interfaces (port A and port B). By adjusting the position of the valve core, port A and port B can be alternately opened or closed.

[0033] The second switch element 52 is used to work in cooperation with the first switch element 51. That is, when the first switch element 51 turns on the first channel 20a, the second switch element 52 adjusts its A port and B port to a conducting state; when the first switch element 51 turns off the first channel 20a, the second switch element 52 adjusts its A port and B port to a closed state, thereby ensuring that the first channel 20a is in a stable closed state.

[0034] refer to Figure 1 and Figure 2 The detection device 1 further includes a first one-way valve 53 and a second one-way valve 54. Through the action of the first one-way valve 53 and the second one-way valve 54, the gas to be tested and the dry gas can flow through the first region M in opposite directions. Specifically, the first one-way valve 53 is connected to the first pipeline 20, and is used to allow the gas to be tested to flow through the first region M from left to right (refer to Figure 1 ); The second one-way valve 54 is connected to the second pipeline 30, for allowing the dry gas to flow through the first region M from right to left (reference Figure 2). After adopting the above arrangement, the degree of convection of the dry gas flowing through the first region M can be increased to improve the drying performance of the dry gas. In addition, the first one-way valve 53 can also limit the flow of dry gas to the gas source of the gas to be tested (in this embodiment, the aerosol-forming article 2).

[0035] refer to Figure 1 After the first one-way valve 53 is provided, one end of the first pipe 20 can be defined as the upstream end 21, and the other end of the first pipe 20 can be defined as the downstream end 22. In this embodiment, the upstream end 21 of the first pipe 20 is connected to the aerosol-forming article 2 to be detected (for example, ordinary cigarettes, heat-not-burn products, electronic cigarettes, etc.). Specifically, a clamp 60 for clamping the aerosol-forming article 2 is provided on the base 10 of the detection device 1. After the aerosol-forming article 2 is clamped on the clamp 60, it can be connected to the upstream end 21 of the first pipe 20. Furthermore, the upstream end 21 of the first pipe 20 is also provided with a filter (not shown), which can be used to filter solid particles in the aerosol generated by the aerosol-forming article 2.

[0036] The downstream end 22 of the first duct 20 is in communication with the smoking machine. When the first channel 20a is opened, the aerosol-forming article 2 can generate aerosol to flow in the first channel 20a through the suction force provided by the smoking machine. Further, by controlling the suction force of the smoking machine (for example, by providing different powers to the smoking machine to control the suction force of the smoking machine), the flow rate of the aerosol flowing in the first channel 20a can be controlled.

[0037] refer to Figure 2 After the second one-way valve 54 is provided, one end of the second pipeline 30 can be defined as the upstream end 31, and the other end of the second pipeline 30 can be defined as the downstream end 32. In this embodiment, the upstream end 31 of the second pipeline 30 is connected to the gas source of the dry gas (specifically, the nitrogen source) so that the nitrogen source can deliver nitrogen to the second channel 30a; the downstream end 32 of the second pipeline 30 is connected to the atmosphere. Further, a pressure reducing valve 55 is provided at the outlet of the nitrogen source. The pressure reducing valve 55 is used to control the pressure of the nitrogen delivered to the second channel 30a to ensure the working safety of the detection device 1.

[0038] The working process of the detection device 1 provided in this embodiment is described below by way of example.

[0039] (1) clamping an aerosol-forming article 2 (e.g., a regular cigarette, a heat-not-burn product, an electronic cigarette) on a holder 60, and controlling the aerosol-forming article 2 to generate an aerosol (e.g., lighting a regular cigarette, or turning on a heating switch of an electronic cigarette, etc.);

[0040] (2) The A and B ports of the two-position three-way valve 51 are controlled to be connected, and the A and B ports of the two-position two-way valve 51 are controlled to be connected. At this time, the first channel 20a is connected, and the second channel 30a is closed;

[0041] (3) Start the smoking machine so that the aerosol generated by the aerosol-forming article 2 is dispersed along the Figure 1 Flow in the direction of the arrow shown;

[0042] (4) Turn on the moisture detection device 40 to detect the moisture content in the aerosol in the first area M. After the detection is completed, turn off the moisture detection device 40;

[0043] (5) Control the A port and the B port of the two-position three-way valve 51 to be closed, and the A port and the B port of the two-position two-way valve 51 to be closed. At this time, the second channel 30a is connected, and the first channel 20a is closed;

[0044] (6) Start the nitrogen source to deliver nitrogen to the second channel 30a. Under the action of each switch element, the nitrogen flows along Figure 2 When the nitrogen flows through the first region M, the moisture in the first region M is dried;

[0045] (7) After the drying process is completed, the A and B ports of the two-position three-way valve 51 are controlled to be connected, and the A and B ports of the two-position two-way valve are controlled to be connected, so as to start the next moisture detection process (for example, the above steps (2) to (4)).

[0046] In summary, the detection device 1 provided in this embodiment can realize the alternating opening and closing of the first channel 20a and the second channel 30a by cleverly designing each switch element. In this way, the dry gas flowing in the second channel 30a dries the moisture in the first region M, so that the moisture content in the aerosol detected by the moisture detection device 40 is the real moisture content in the aerosol, and will not be affected by the residual moisture, so that it can have a higher detection accuracy.

[0047] In summary, the above embodiments provided by the present invention are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A device for detecting the moisture content in gas, characterized in that: include: Pedestal; a first pipe disposed on the base, the first pipe forming a first channel for the gas to be tested to flow, the first channel including a first area; a moisture detection device is disposed on the first pipe, and when the gas to be tested flows through the first area, the moisture detection device can detect the moisture content of the gas to be tested in the first area; a second pipe disposed on the base, the second pipe forming a second channel for the circulation of dry gas, the second channel being in fluid communication with the first region of the first channel; and a switch element provided on the first pipeline and / or the second pipeline, the switch element being configured to enable the first channel and the second channel to be alternately turned on or off; wherein when the first channel is closed by the switch element, the dry gas flowing in the second channel can dry the moisture in the first region; The gas to be tested is an aerosol generated when an aerosol-forming article is inhaled. In the flow direction of the gas to be tested, the upstream end of the first pipe is connected to the aerosol-forming article, the downstream end of the first pipe is connected to the smoking machine, the upstream end of the second pipe is connected to the gas source of the dry gas, and the downstream end of the second pipe is connected to the atmosphere.

2. The device according to claim 1, characterized in that The switch element comprises a first switch element connected to the first pipeline and the second pipeline; by controlling the position of the valve core of the first switch element, the first switch element can be alternately in a first state and a second state; When the first switch element is in the first state, the first channel is turned on and the second channel is turned off; when the first switch element is in the second state, the first channel is turned off and the second channel is turned on.

3. The device according to claim 2, characterized in that The first switch element is a two-position three-way valve.

4. The device according to claim 2, characterized in that The switch element further includes a second switch element connected to the first pipe, and the second switch element is used to alternately open and close the second channel.

5. The device according to claim 1, characterized in that The switch element is further configured to allow the gas to be measured and the dry gas to flow through the first region in opposite directions.

6. The device according to claim 5, characterized in that The switch element further includes a first one-way valve disposed on the first pipeline and a second one-way valve disposed on the second pipeline; wherein, The first one-way valve is configured to allow the gas to flow in the first region along a first direction, and the second one-way valve is configured to allow the dry gas to flow in the first region along a second direction opposite to the first direction.

7. The device according to claim 1, characterized in that A filter is provided at the upstream end of the first pipeline, and the filter is used to filter solid particles in the gas to be tested.

8. The device according to claim 1, characterized in that The drying gas is a combination of one or more of nitrogen, argon, helium and hydrogen.

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