A dynamic filter ventilation rate detection device based on constant flow

Abstract

The present invention discloses a dynamic filter ventilation rate detection device based on constant flow, comprising a cigarette fixing mechanism, an air extraction mechanism, a flow detection mechanism, a flow control mechanism, and a cigarette burn line detection mechanism; the cigarette fixing mechanism comprises a first cigarette clamping unit and a sleeve, the sleeve being provided with a cigarette insertion port, a flow detection port, and a suction port, the cigarette insertion port being used to insert the cigarette into the sleeve; the air extraction mechanism extracts air from the sleeve through the suction port; the flow detection mechanism is connected to the flow detection port; the flow control mechanism is arranged between the air extraction mechanism and the sleeve; the cigarette burn line detection mechanism is used to detect the position of the cigarette burn line. The filter ventilation rate detection device disclosed herein realizes dynamic monitoring and detection of the filter ventilation rate by detecting the position of the cigarette burn line, and can detect the dynamic changes of the filter ventilation rate during the cigarette burning and smoking process, which is conducive to more accurately evaluating the real impact of the filter ventilation rate on the smoking experience.

Description

Technical Field

[0001] The present invention relates to the field of filter ventilation rate, and more particularly to a dynamic filter ventilation rate detection device based on constant flow. Background Art

[0002] Filter ventilation technology is a common method used by domestic and international cigarette manufacturers to reduce tar and harm. The ventilation rate of cigarette filters is not only closely related to the sensory quality of cigarettes, but also directly affects the release of mainstream smoke components such as tar, nicotine, and carbon monoxide.

[0003] Existing methods for measuring filter ventilation rate use the ventilation rate unit of a comprehensive cigarette and filter rod physical property test bench under unlit conditions. However, during cigarette combustion, complex high-temperature pyrolysis chemical reactions occur, and as the cigarette length gradually decreases during combustion, these factors affect the ventilation rate of the cigarette filter. The results obtained by existing filter ventilation rate testing methods fail to reflect the dynamic changes during cigarette smoking and cannot accurately evaluate the true impact of filter ventilation rate on the smoking experience.

[0004] Therefore, how to provide a device that can detect the dynamic changes in the ventilation rate of cigarette filters has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] An object of the present invention is to provide a new technical solution for a dynamic filter ventilation rate detection device based on a constant flow rate, which can detect dynamic changes in the ventilation rate of a cigarette filter.

[0006] According to a first aspect of the present invention, a dynamic filter ventilation rate detection device based on constant flow is provided.

[0007] The dynamic filter ventilation rate detection device based on constant flow includes a cigarette fixing mechanism, an air extraction mechanism, a flow detection mechanism, a flow control mechanism and a cigarette burning line detection mechanism; wherein,

[0008] The cigarette fixing mechanism includes a first cigarette clamping unit and a sleeve. The sleeve is provided with a cigarette insertion port, a flow detection port, and an inhalation port. The cigarette insertion port is used to insert a cigarette into the sleeve. The first cigarette clamping unit is used to clamp the cigarette in the sleeve and close the gap between the sleeve and the cigarette.

[0009] The air extraction mechanism extracts air from the sleeve through the suction port;

[0010] The flow detection mechanism is connected to the flow detection port;

[0011] The flow control mechanism is used to control the flow rate of the air extraction mechanism on the sleeve to be a constant flow rate, and the flow control mechanism is arranged between the air extraction mechanism and the sleeve;

[0012] The cigarette burning line detection mechanism is used to detect the position of the burning line of the cigarette.

[0013] Optionally, the cigarette insertion port and the suction port are respectively located at both ends of the sleeve in the length direction, the flow detection port is located on the side wall of the sleeve, and the flow detection port is covered by the filter of the cigarette inserted in the sleeve.

[0014] Optionally, the dynamic filter ventilation rate detection device based on constant flow further includes a filter and a pressure difference sensor;

[0015] The filter is arranged between the flow control mechanism and the cigarette fixing mechanism;

[0016] The pressure difference sensor is arranged between the cigarette fixing mechanism and the filter, and is used to measure the difference between the pressure of the pipeline between the cigarette fixing mechanism and the filter and the atmospheric pressure.

[0017] Optionally, the air extraction mechanism is a negative pressure generator.

[0018] Optionally, the flow detection mechanism is a laminar flow meter;

[0019] The flow control mechanism is a sonic nozzle.

[0020] Optionally, the cigarette burning line detection mechanism includes a CCD camera for taking photos of the cigarette burning.

[0021] Optionally, the first cigarette clamping unit is a flexible tube, and the first cigarette clamping unit is arranged at the cigarette insertion port;

[0022] The exhaust mechanism is further used to exhaust air from the first cigarette clamping unit, so that the first cigarette clamping unit is deformed to clamp the cigarette in the sleeve and close the gap between the sleeve and the cigarette.

[0023] Optionally, the cigarette fixing mechanism further includes a second cigarette clamping unit, the second cigarette clamping unit is a flexible tube, and the second cigarette clamping unit is arranged at the suction port;

[0024] The air extraction mechanism is further used to extract air from the second cigarette clamping unit, so that the second cigarette clamping unit is deformed to close the gap between the sleeve and the cigarette.

[0025] Optionally, the dynamic filter ventilation rate detection device based on constant flow further includes a two-position three-way valve;

[0026] The first inlet of the two-position three-way valve is connected to the pipeline between the air inlet end of the exhaust mechanism and the flow control mechanism, the second inlet of the two-position three-way valve is connected to the pipeline between the air inlet end of the exhaust mechanism and the atmosphere, and the first cigarette clamping unit and the second cigarette clamping unit are both connected to the outlet of the two-position three-way valve.

[0027] Optionally, the dynamic filter ventilation rate detection device based on constant flow further includes a filter assembly;

[0028] The filter assembly includes a switch valve and a filter pressure reducing valve, both of which are arranged on the pipeline between the air inlet end of the air extraction mechanism and the atmosphere, and the switch valve is farther away from the air inlet end of the air extraction mechanism than the filter pressure reducing valve.

[0029] The filter ventilation rate detection device disclosed in the present invention realizes dynamic monitoring and detection of the filter ventilation rate by detecting the position of the combustion line of the cigarette. It can detect the dynamic changes of the filter ventilation rate during the smoking process of the cigarette, which is conducive to more accurately evaluating the real impact of the filter ventilation rate on the smoking experience.

[0030] Further features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0032] Figure 1 This is a structural schematic diagram of an embodiment of a dynamic filter ventilation rate detection device based on constant flow disclosed in the present invention.

[0033] The following are marked in the figure:

[0034] Cigarette fixing mechanism 1, first cigarette clamping unit 11, sleeve 12, cigarette insertion port 121, flow detection port 122, suction port 123, second cigarette clamping unit 13, suction mechanism 2, flow detection mechanism 3, flow control mechanism 4, cigarette burn line detection mechanism 5, CCD camera 50, filter 6, differential pressure sensor 7, two-position three-way valve 8, first inlet 81, second inlet 82, outlet 83, filter assembly 9, on / off valve 91, filter pressure reducing valve 92, cigarette 01. DETAILED DESCRIPTION

[0035] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0036] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0037] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0038] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0039] It should be noted that like reference numbers and letters refer to similar items in the following drawings.

[0040] like Figure 1 As shown, the present disclosure provides a dynamic filter ventilation rate detection device based on constant flow, including a cigarette fixing mechanism 1, an air extraction mechanism 2, a flow detection mechanism 3, a flow control mechanism 4 and a cigarette burning line detection mechanism 5.

[0041] The air extraction mechanism 2 may be, for example, an air extraction pump, a vacuum pump, or a negative pressure generator. The flow rate detection mechanism 3 may be, for example, a flow rate sensor or a laminar flow meter. The flow rate control mechanism 4 may be, for example, a solenoid valve or a sonic nozzle. The cigarette burn line detection mechanism 5 may be, for example, a mechanism that obtains the location of the burn line by photographing the burning cigarette or a mechanism that detects the location of the burn line using a photoelectric sensor.

[0042] The cigarette securing mechanism 1 comprises a first cigarette clamping unit 11 and a sleeve 12. The sleeve 12 is provided with a cigarette insertion port 121, a flow detection port 122, and an inhalation port 123. The cigarette insertion port 121 is used to insert the cigarette 01 into the sleeve 12. Typically, the filter of the cigarette 01 should be completely within the sleeve 12 to more accurately measure the filter ventilation rate. The first cigarette clamping unit 11 is used to clamp the cigarette 01 within the sleeve 12 and close the gap between the sleeve 12 and the cigarette 01.

[0043] The first cigarette clamping unit 11 can be, for example, an elastic sealing ring or a mechanical arm. In a specific implementation, the first cigarette clamping unit 11 can also be configured as a flexible tube that can be inflated or deflated. The inflation or deflation of the air can be used to deform the first cigarette clamping unit 11, thereby clamping or releasing the cigarette 01 within the sleeve 12.

[0044] The air extraction mechanism 2 extracts air from the sleeve 12 through the suction port 123 .

[0045] The flow detection mechanism 3 is connected to the flow detection port 122 .

[0046] The flow control mechanism 4 is used to control the flow rate of the exhaust mechanism 2 to the sleeve 12 to a constant flow rate, and the flow control mechanism 4 is arranged between the exhaust mechanism 2 and the sleeve 12. The above-mentioned constant flow rate can be flexibly selected according to actual needs. For example, the constant flow rate is 17.5 mL / s.

[0047] The cigarette burn line detection mechanism 5 is used to detect the position of the burn line of the cigarette 01 .

[0048] When the dynamic filter ventilation rate detection device based on constant flow disclosed herein is used, the cigarette 01 is first inserted into the sleeve 12 from the cigarette insertion port 121, and the cigarette 01 is clamped in the sleeve 12 by the first cigarette clamping unit 11. Then the suction mechanism 2 performs a suction operation on the sleeve 12 through the suction port 123, and the suction flow rate after the airflow stabilizes is q (the suction flow rate is constant), and the cigarette 01 is ignited. As the cigarette 01 burns, the cigarette burning line detection mechanism 5 can continuously obtain the position of the burning line of the cigarette 01, that is, the distance d between the burning line of the cigarette 01 and the end of the cigarette 01 can be obtained, and the flow detection mechanism 3 can detect the cigarette filter ventilation flow rate Q d .

[0049] Thus, the dynamic filter ventilation rate detection device based on constant flow can detect the cigarette filter ventilation rate Q when the distance between the burning line of the cigarette 01 and the end of the cigarette 01 is d. d / q.

[0050] The filter ventilation rate detection device disclosed herein realizes dynamic monitoring and detection of the filter ventilation rate by detecting the position of the combustion line of the cigarette 01. It can detect the dynamic changes of the filter ventilation rate during the smoking process of the cigarette, which is conducive to more accurately evaluating the real impact of the filter ventilation rate on the smoking experience.

[0051] In one embodiment of the constant flow-based dynamic filter ventilation rate detection device disclosed herein, to improve the accuracy of filter ventilation rate detection, a cigarette insertion port 121 and a suction port 123 are located at opposite ends of the sleeve 12 in the longitudinal direction. A flow detection port 122 is located on the side wall of the sleeve 12 and is covered by the filter of the cigarette 01 inserted in the sleeve 12.

[0052] In one embodiment of the constant flow-based dynamic filter ventilation rate detection device disclosed herein, the device further comprises a filter 6 and a pressure differential sensor 7. The filter 6 is disposed between the flow control mechanism 4 and the cigarette holder 1 to prevent impurities such as shredded tobacco from clogging the flow control mechanism 4. The pressure differential sensor 7 is disposed between the cigarette holder 1 and the filter 6 and is configured to measure the difference between the pressure in the line between the cigarette holder 1 and the filter 6 and atmospheric pressure P.

[0053] The pressure difference sensor 7 can detect the pressure drop P in the pipeline between the cigarette fixing mechanism 1 and the filter 6. d . Through the pressure drop P d , the filter ventilation rate can be corrected. Specifically, the filter ventilation rate is calculated using the following formula:

[0054]

[0055] In one embodiment of the dynamic filter ventilation rate detection device based on constant flow disclosed herein, in order to provide a better air extraction effect, the air extraction mechanism 2 is a negative pressure generator.

[0056] In one embodiment of the dynamic filter ventilation rate detection device based on constant flow disclosed herein, in order to provide more effective flow detection and flow control effects, the flow detection mechanism 3 is a laminar flow meter, and the flow control mechanism 4 is a sonic nozzle.

[0057] In one embodiment of the constant-flow-based dynamic filter ventilation rate detection device disclosed herein, the cigarette burn line detection mechanism 5 includes a CCD camera 50 for capturing images of the burning cigarette 01. In specific implementations, the cigarette burn line detection mechanism 5 may also include a processor for processing the images captured by the CCD camera 50. By continuously capturing images of the cigarette 01 by the CCD camera 50, the location of the burn line of the cigarette 01 can be determined.

[0058] In one embodiment of the dynamic filter ventilation rate detection device based on constant flow disclosed herein, the first cigarette clamping unit 11 is a flexible tube. The first cigarette clamping unit 11 is arranged at the cigarette insertion port 121. The flexible tube can be, for example, a latex tube.

[0059] The exhaust mechanism 2 is further used to exhaust the first cigarette clamping unit 11 so as to deform the first cigarette clamping unit 11 , thereby clamping the cigarette 01 in the sleeve 12 and closing the gap between the sleeve 12 and the cigarette 01 .

[0060] In specific implementation, after the cigarette 01 is inserted into the sleeve 12 , the exhaust mechanism 2 can exhaust air from the first cigarette clamping unit 11 , so that the first cigarette clamping unit 11 clamps the cigarette 01 and closes the gap between the sleeve 12 and the cigarette 01 .

[0061] Furthermore, the cigarette fixing mechanism 1 further comprises a second cigarette clamping unit 13. The second cigarette clamping unit 13 is a flexible tube, and the second cigarette clamping unit 13 is arranged at the suction port 123. The flexible tube can be, for example, a latex tube.

[0062] The suction mechanism 2 is further used to suction the second cigarette clamping unit 13 so as to deform the second cigarette clamping unit 13 and thereby close the gap between the sleeve 12 and the cigarette 01 .

[0063] In specific implementation, after the cigarette 01 is inserted into the sleeve 12, the exhaust mechanism 2 can simultaneously exhaust the first cigarette clamping unit 11 and the second cigarette clamping unit 13, so that the first cigarette clamping unit 11 and the second cigarette clamping unit 13 clamp the cigarette 01 and close the gap between the sleeve 12 and the cigarette 01.

[0064] Furthermore, the dynamic filter ventilation rate detection device based on constant flow also includes a two-position three-way valve 8.

[0065] The first inlet 81 of the two-position, three-way valve 8 is connected to the pipeline between the air inlet of the exhaust mechanism 2 and the flow control mechanism 4. The second inlet 82 of the two-position, three-way valve 8 is connected to the pipeline between the air inlet of the exhaust mechanism 2 and the atmosphere. The first and second cigarette clamping units 11, 13 are both connected to the outlet 83 of the two-position, three-way valve 8.

[0066] Before cigarette 01 is inserted into sleeve 12, the first inlet 81 of the two-position three-way valve 8 is connected to the outlet 83. At this point, the first and second cigarette clamping units 11, 13 are not deformed or are only slightly deformed, allowing cigarette 01 to be inserted into sleeve 12 with relative ease. After cigarette 01 is inserted into sleeve 12, the second inlet 82 of the two-position three-way valve 8 is connected to the outlet 83. At this point, both the first and second cigarette clamping units 11, 13 are deformed, thereby clamping cigarette 01 within sleeve 12.

[0067] In order to ensure the normal and stable operation of the air extraction mechanism 2 , the dynamic filter ventilation rate detection device based on constant flow further includes a filter assembly 9 .

[0068] The filter assembly 9 includes an on-off valve 91 and a filter pressure-reducing valve 92. Both valves are located in the pipeline between the air intake of the air extraction mechanism 2 and the atmosphere, with the on-off valve 91 being located further away from the air intake of the air extraction mechanism 2 than the filter pressure-reducing valve 92. The air extraction mechanism 2 can only function properly when the on-off valve 91 is opened.

[0069] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A dynamic filter ventilation rate detection device based on constant flow, characterized in that: It includes a cigarette fixing mechanism, an air extraction mechanism, a flow detection mechanism, a flow control mechanism and a cigarette burning line detection mechanism; wherein, The cigarette fixing mechanism includes a first cigarette clamping unit and a sleeve. The sleeve is provided with a cigarette insertion port, a flow detection port, and an inhalation port. The cigarette insertion port is used to insert a cigarette into the sleeve. The first cigarette clamping unit is used to clamp the cigarette in the sleeve and close the gap between the sleeve and the cigarette. The air extraction mechanism extracts air from the sleeve through the suction port; The flow detection mechanism is connected to the flow detection port; The flow control mechanism is used to control the flow rate of the air extraction mechanism on the sleeve to be a constant flow rate, and the flow control mechanism is arranged between the air extraction mechanism and the sleeve; The cigarette burning line detection mechanism is used to detect the position of the cigarette burning line; The dynamic filter ventilation rate detection device based on constant flow also includes a filter and a pressure difference sensor; The filter is arranged between the flow control mechanism and the cigarette fixing mechanism; The pressure difference sensor is arranged between the cigarette fixing mechanism and the filter, and is used to measure the difference between the pressure of the pipeline between the cigarette fixing mechanism and the filter and the atmospheric pressure; The pressure drop P of the pipeline between the cigarette fixing mechanism and the filter detected by the pressure difference sensor d , through the pressure drop P d Correction is made for the filter ventilation rate, which is calculated using the following formula: ； Among them, Q d is the ventilation flow rate of the cigarette filter, q is the suction flow rate, and P is the atmospheric pressure; The first cigarette clamping unit is a flexible tube, and the first cigarette clamping unit is arranged at the cigarette insertion port; The exhaust mechanism is further used to exhaust air from the first cigarette clamping unit, so that the first cigarette clamping unit is deformed to clamp the cigarette in the sleeve and close the gap between the sleeve and the cigarette; The cigarette fixing mechanism further includes a second cigarette clamping unit, which is a flexible tube and is arranged at the suction port; The exhaust mechanism is further used to exhaust air from the second cigarette clamping unit, so that the second cigarette clamping unit is deformed to close the gap between the sleeve and the cigarette; The dynamic filter ventilation rate detection device based on constant flow also includes a two-position three-way valve; The first inlet of the two-position three-way valve is connected to the pipeline between the air inlet end of the air extraction mechanism and the flow control mechanism, the second inlet of the two-position three-way valve is connected to the pipeline between the air inlet end of the air extraction mechanism and the atmosphere, and the first cigarette clamping unit and the second cigarette clamping unit are both connected to the outlet of the two-position three-way valve; The dynamic filter ventilation rate detection device based on constant flow also includes a filter assembly; The filter assembly includes a switch valve and a filter pressure reducing valve, both of which are arranged on the pipeline between the air inlet end of the air extraction mechanism and the atmosphere, and the switch valve is farther away from the air inlet end of the air extraction mechanism than the filter pressure reducing valve.

2. The dynamic filter ventilation rate detection device based on constant flow according to claim 1, characterized in that: The cigarette insertion port and the suction port are respectively located at two ends of the sleeve in the length direction. The flow detection port is located on the side wall of the sleeve, and the flow detection port is covered by the filter of the cigarette inserted in the sleeve.

3. The dynamic filter ventilation rate detection device based on constant flow according to claim 1, characterized in that: The air extraction mechanism is a negative pressure generator.

4. The dynamic filter ventilation rate detection device based on constant flow according to claim 1, characterized in that: The flow detection mechanism is a laminar flow meter; The flow control mechanism is a sonic nozzle.

5. The dynamic filter ventilation rate detection device based on constant flow according to claim 1, characterized in that: The cigarette burning line detection mechanism includes a CCD camera for taking photos of the burning of cigarettes.

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