Measurement cavity for smoke concentration based on negative pressure suction smoke

Abstract

The utility model provides a measuring cavity for smoke concentration based on negative pressure suction smoke. The measuring cavity comprises a measuring cavity, an air inlet, an air outlet, a first window, a second window and a third window, the air inlet and the air outlet are formed in the two ends of the measuring cavity in the length direction; the first window, the second window and the third window are respectively arranged in the middle area of the side part of the measuring cavity, passing light paths of the first window and the second window are positioned on the same straight line to form a transmission method light path, and a passing light path of the third window is positioned beside the transmission method light path to form a scattering method light path. The measuring cavity based on the negative pressure suction tobacco smoke concentration has the advantage of being compatible with a perspective method and a scattering method for simultaneous detection.

Description

Technical Field

[0001] The utility model relates to the technical field of tobacco smoke detection. Specifically, it relates to a measurement chamber for measuring the concentration of tobacco smoke based on negative pressure suction. Background Art

[0002] There are various methods for detecting the concentration of smoke. One of them is to detect with the aid of laser, and the means of laser detection include transmission method detection and scattering method detection. Each has its own advantages and disadvantages, and they are usually applied separately according to the situation.

[0003] Among them, for the transmission method, the smoke concentration should not be too high. Excessive concentration seriously blocks the smoke and affects the detection accuracy of the transmission method; for the scattering method, the smoke concentration should not be too low. Too low concentration affects the scattering efficiency and thus affects the detection accuracy.

[0004] In the system for detecting smoked tobacco one puff at a time, the smoke concentration continuously changes with the progress of suction. The concentration of each puff of smoke is different, usually showing that the concentration of the first puff of smoke is the highest and the concentration of the last puff of smoke is the lowest. This makes it impossible to apply a single detection method to this system, and it is necessary to organically combine the two methods.

[0005] In the traditional scheme, the measurement chamber directly uses the cavity of the suction pump. Based on the principles of the transmission method and the scattering method and the characteristics of the smoking machine set, it is difficult to transform the traditional scheme and it is not applicable. Therefore, a new design is needed, that is, it is necessary to meet the simultaneous detection of the two methods and at the same time avoid the problem that the suction force of the smoking machine set causes the smoke to pass through the measurement chamber too quickly.

[0006] In order to solve the above problems, people have been seeking an ideal technical solution. Content of the Utility Model

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art, and thus provide a measurement chamber for measuring the concentration of tobacco smoke based on negative pressure suction, which is suitable for the simultaneous detection of the transmission method and the scattering method, can slow down the smoke flow rate and make the smoke fully diffuse into the interior of the measurement chamber.

[0008] To achieve the above purpose, the technical solution adopted by the utility model is: a measurement chamber for measuring the concentration of tobacco smoke based on negative pressure suction, comprising a measurement chamber, an air inlet, an air outlet, a first window, a second window and a third window;

[0009] The air inlet and the air outlet are arranged at both ends in the length direction of the measurement chamber;

[0010] The first window, the second window, and the third window are respectively disposed in the central regions on the side portions of the measurement chamber. Among them, the optical paths passing through the first window and the second window are on the same straight line to form a transmission method optical path, and the optical path passing through the third window is located beside the transmission method optical path to form a scattering method optical path.

[0011] Based on the above, a spoiler is disposed in the measurement chamber for fully diffusing the air flow.

[0012] Based on the above, the spoiler is an arc-shaped plate. The arc-shaped plate is installed in the upper region near the air outlet. The outer arc surface of the arc-shaped plate is close to the air outlet, and the inner arc surface of the arc-shaped plate faces the central region of the measurement chamber.

[0013] Based on the above, convex strips are provided at the edge of the outer arc surface of the spoiler. The convex strips are in contact with and fixed to the inner bottom of the measurement chamber. The convex strips support the outer arc surface to form an air flow gap between the outer arc surface and the air outlet.

[0014] Based on the above, an exhaust port is further provided at the top end of the measurement chamber.

[0015] Based on the above, the measurement chamber has a rectangular outer shape, and the inner cavity of the measurement chamber is cylindrical. The first window, the second window, and the third window are respectively disposed on three side surfaces of the rectangular structure, such that the scattering method optical path and the transmission method optical path are perpendicular.

[0016] Based on the above, the measurement chamber includes a main body, an upper pressing cover, a lower pressing cover, and window mounting holes. The upper pressing cover and the lower pressing cover are respectively and sealingly disposed at the top end and the bottom end of the main body. The interior of the main body is the cylindrical inner cavity. The first window, the second window, and the third window are respectively installed at the three window mounting holes. The air inlet and the exhaust port are provided on the upper pressing cover, and the air outlet is provided on the lower pressing cover.

[0017] Based on the above, fixing holes are provided on the side surface of the main body where no window mounting holes are provided.

[0018] Based on the above, the measurement chamber is made of a metal material or a plastic material.

[0019] Based on the above, a reflective film is provided on the inner wall of the measurement chamber.

[0020] The present utility model has substantial features and progress compared with the prior art. Specifically, the present utility model has the following advantages:

[0021] 1. In the traditional solution, the measurement chamber is not an independent structure. Instead, the cavity structure of the suction pump is directly used as the measurement chamber. Therefore, its applicable range is extremely narrow. In this solution, an independent measurement chamber is added to the traditional solution, enabling the suction pump to suck and temporarily store the flue gas in the measurement chamber. The structural design of the measurement chamber becomes more flexible, and multiple window structures can be set, which can meet the simultaneous detection of the transmission method and the scattering method. At the same time, due to the temporary storage function of the temporary storage chamber, the speed of the flue gas entering the suction pump can be slowed down, and the flue gas can diffuse in the temporary storage chamber, meeting the needs of smoke concentration detection.

[0022] 2. A spoiler structure is set to prevent the air flow from passing through the measurement chamber quickly and enable the smoke to fully diffuse in the measurement chamber, suppressing the flow of the smoke towards the air extraction pump, providing convenience for detection.

[0023] 3. Since the smoke is temporarily stored in the measurement chamber and does not directly flow towards the suction pump, over time, the inner wall of the cavity of the suction pump is not prone to the problem of residual tar, extending the service life of the suction pump.

[0024] 4. The independent design form of the measurement chamber is also convenient for replacement during actual use to meet different measurement requirements. Description of the Drawings

[0025] Figure 1 is one of the structural schematic diagrams of the measurement chamber for measuring the concentration of tobacco flue gas based on negative pressure suction in the present utility model.

[0026] Figure 2 is the second structural schematic diagram of the measurement chamber for measuring the concentration of tobacco flue gas based on negative pressure suction in the present utility model.

[0027] Figure 3 is the third structural schematic diagram of the measurement chamber for measuring the concentration of tobacco flue gas based on negative pressure suction in the present utility model.

[0028] Figure 4 is the cross-sectional view of the measurement chamber for measuring the concentration of tobacco flue gas based on negative pressure suction in the present utility model.

[0029] Figure 5 is the internal enlarged view of the measurement chamber for measuring the concentration of tobacco flue gas based on negative pressure suction in the present utility model.

[0030] In the figure: 1. Measurement chamber; 2. Air inlet; 3. Air outlet; 4. First window; 5. Second window; 6. Third window; 7. Spoiler; 8. Rib; 9. Drain port; 11. Main body; 12. Upper pressing cover; 13. Lower pressing cover; 14. Window mounting hole; 15. Fixing hole. Detailed Embodiment

[0031] The technical solution of the present utility model will be further described in detail below through specific embodiments.

[0032] As shown Figures 1 - 4 in the figure, a measurement chamber for measuring the concentration of tobacco smoke based on negative pressure suction includes a measurement chamber 1, an air inlet 2, an air outlet 3, a first window 4, a second window 5, and a third window 6.

[0033] The air inlet 2 and the air outlet 3 are arranged at both ends of the measurement chamber 1 in the length direction. In this embodiment, the measurement chamber 1 includes a main body 11, an upper pressure cover 12, a lower pressure cover 13, and a window mounting hole 14. The upper pressure cover 12 and the lower pressure cover 13 are respectively and sealingly arranged at the top and bottom of the main body 11. The interior of the main body 11 is a cylindrical inner cavity, and the external shape is rectangular. The first window 4, the second window 5, and the third window 6 are respectively installed at three window mounting holes 14. The air inlet 2 is arranged on the upper pressure cover 12, the air outlet 3 is arranged on the lower pressure cover 13, and a fixing hole 15 is arranged on the side surface of the main body 11 without a window mounting hole for fixing the measurement chamber 1 to other structures.

[0034] In this embodiment, the measurement chamber 1 is made of metal or plastic, and other materials that are easy to form can also be used.

[0035] In a preferred embodiment, a reflective film is provided on the inner wall of the measurement chamber to facilitate the reflection and diffusion of laser inside the measurement chamber.

[0036] The first window 4, the second window 5, and the third window 6 are respectively arranged in the central area on the side of the measurement chamber 1. Among them, the passing optical paths of the first window 4 and the second window 5 are on the same straight line to form a transmission method optical path, and the passing optical path of the third window 6 is located beside the transmission method optical path to form a scattering method optical path. In this embodiment, since the main body 1 of the measurement chamber is rectangular, the scattering method optical path and the transmission method optical path are perpendicular.

[0037] In a preferred embodiment, in order to prevent the smoke from passing through the measurement chamber 1 too quickly when passing through the measurement chamber 1 and enable the smoke to fully diffuse into the measurement chamber 1, a spoiler 7 is arranged inside the measurement chamber 1 to fully diffuse the airflow.

[0038] Specifically, the spoiler 7 is an arc-shaped plate, and the arc-shaped plate is installed in the upper area near the air outlet 3. The outer arc surface of the arc-shaped plate is close to the air outlet 3, and the inner arc surface of the arc-shaped plate faces the central area of the measurement chamber 1.

[0039] In order to facilitate the installation of the spoiler 7, in a preferred embodiment, a convex strip 8 is arranged at the edge of the outer arc surface of the spoiler 7. The convex strip 8 contacts and is fixed to the inner bottom of the measurement chamber 1, and the convex strip supports the outer arc surface to form an air flow gap between the outer arc surface and the air outlet 3.

[0040] To facilitate the evacuation of flue gas or the introduction of external air to help the flue gas quickly evacuate from the measurement chamber, an evacuation port 9 is also provided at the top of the measurement chamber 1, and the evacuation port 9 is specifically provided on the upper gland 12.

[0041] The measurement chamber is made of metal or plastic.

[0042] Principle of operation description:

[0043] The intake end of the smoking machine device is connected to the outlet 3 of the measurement chamber 1, the mouthpiece of the smoking device is connected to the inlet 2 of the measurement chamber 1 through a flue gas capture device, and the evacuation port 9 is connected to the atmosphere.

[0044] The emitting end of the laser generator is docked with the first window 4, the receiving end of the transmission method is docked with the second window 5, and the receiving end of the scattering method is docked with the third window 6.

[0045] When starting the detection, the smoking machine device starts to smoke one by one. Each puff of smoke stays in the temporary storage chamber 1. The measuring device measures the smoke concentration, and then the smoking machine secondarily sucks and evacuates the flue gas after the measurement is completed. Air enters through the evacuation port for replacement; sucking one by one to complete the entire measurement process.

[0046] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: it is still possible to modify the specific implementation manners of the present invention or perform equivalent replacements for some technical features; without departing from the spirit of the technical solutions of the present invention, they should all be covered within the scope of the technical solutions claimed by the present invention.

Claims

1. A measurement chamber for measuring the concentration of tobacco smoke based on negative pressure suction, characterized in that: It includes a measurement chamber, an air inlet, an air outlet, a first window, a second window and a third window; The air inlet and the air outlet are arranged at both ends in the length direction of the measurement chamber; The first window, the second window and the third window are respectively arranged in the central area on the side of the measurement chamber. Among them, the passing optical paths of the first window and the second window are on the same straight line to form a transmission method optical path, and the passing optical path of the third window is located beside the transmission method optical path to form a scattering method optical path.

2. The measurement chamber for measuring the tobacco smoke concentration based on negative pressure suction according to claim 1, characterized in that: A spoiler is arranged in the measurement chamber to fully diffuse the airflow.

3. The measurement chamber for measuring the concentration of tobacco smoke based on negative pressure suction according to claim 2, characterized in that: The spoiler is an arc-shaped plate. The arc-shaped plate is installed in the upper area near the air outlet. The outer arc surface of the arc-shaped plate is close to the air outlet, and the inner arc surface of the arc-shaped plate faces the central area of the measurement chamber.

4. The measurement chamber for measuring the concentration of tobacco smoke based on negative pressure extraction according to claim 3, characterized in that: A convex strip is arranged at the edge of the outer arc surface of the spoiler. The convex strip contacts and is fixed to the inner bottom of the measurement chamber. The convex strip supports the outer arc surface to form an air flow gap between the outer arc surface and the air outlet.

5. The measurement chamber for measuring the concentration of tobacco smoke based on negative pressure extraction according to any one of claims 1-4, characterized in that: A drain port is also arranged at the top of the measurement chamber.

6. The measurement chamber for measuring the tobacco smoke concentration based on negative pressure extraction according to claim 5, characterized in that: The measurement chamber has a rectangular outer shape, and the inner cavity of the measurement chamber is cylindrical. The first window, the second window and the third window are respectively arranged on three side surfaces of the rectangular structure, so that the scattering method optical path and the transmission method optical path are perpendicular.

7. The measurement chamber for measuring the concentration of tobacco smoke based on negative pressure extraction according to claim 6, wherein: The measurement chamber includes a main body, an upper pressing cover, a lower pressing cover and window mounting holes. The upper pressing cover and the lower pressing cover are respectively sealed at the top and bottom of the main body. The inside of the main body is the cylindrical inner cavity. The first window, the second window and the third window are respectively installed at the three window mounting holes. The air inlet and the drain port are arranged on the upper pressing cover, and the air outlet is arranged on the lower pressing cover.

8. The measurement chamber for measuring the tobacco smoke concentration based on negative pressure extraction according to claim 7, wherein: Fixing holes are arranged on the side surface of the main body where no window mounting holes are provided.

9. The measurement chamber for measuring the concentration of tobacco smoke based on negative pressure extraction according to claim 1 or 2 or 3, characterized in that: The measurement chamber is made of metal or plastic.

10. The measurement chamber for measuring the tobacco smoke concentration based on negative pressure extraction according to claim 1 or 2 or 3, characterized in that: A reflective film is arranged on the inner wall of the measurement chamber.

Images