Integrated module for testing draw resistance and ventilation rate

Abstract

The utility model provides a draw resistance ventilation rate test integrated module. The draw resistance ventilation rate test integrated module comprises a module main body, and a test head assembly, a valve control assembly, a sensor assembly and a negative pressure generator assembly which are integrated in the module main body, the test head assembly is used for loading a cigarette to be tested, the test head assembly is internally provided with gas path interfaces required by testing, and the module main body is internally provided with gas path channels communicated with the gas path interfaces; the valve control assembly comprises a plurality of valves integrated in the module main body and is used for controlling the on-off of each gas path so as to realize the on-off of a gas path required by a draw resistance test or a gas path required by a ventilation degree test; the sensor assembly comprises a ventilation degree test assembly and a draw resistance test assembly, and different air paths are conducted through the valve control assembly to complete ventilation degree test and draw resistance test; the negative pressure generator assembly is connected with the testing head assembly through a gas circuit. The integrated module for testing the draw resistance and the ventilation rate has the advantages of high integration degree, no additional connecting fittings and good stability.

Description

Technical Field

[0001] This utility model relates to the field of tobacco detection technology, specifically to an integrated module for testing suction resistance and ventilation rate. Background Technology

[0002] Currently, cigarette / filter testing stations produced by different manufacturers are composed of multiple functional modules. Regularly replacing vulnerable and consumable parts is necessary to ensure the accuracy of the entire device.

[0003] However, due to the large number of parts, the assembly process and each maintenance process require dedicated personnel for adjustment and installation, which is time-consuming and labor-intensive. Even if the user has the spare parts, the test results after installation may vary due to different production batches.

[0004] In addition, the unit structure for measuring suction resistance ventilation rate varies from manufacturer to manufacturer, mainly in terms of pneumatic component circuits and test sensors, which leads to significant differences in the results obtained from equipment purchased from different manufacturers.

[0005] The average draw resistance of each group of 30 tubes typically varies between 20-50 Pa, and the ventilation rate varies between 2-3%, which causes problems for laboratory experiments.

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

[0007] The purpose of this utility model is to address the shortcomings of existing technologies by providing an integrated module for testing suction resistance and ventilation rate that is highly integrated, requires no additional connecting accessories, and has good stability.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: an integrated module for testing suction resistance ventilation rate, comprising a module body and a test head assembly, a valve control assembly, a sensor assembly, and a negative pressure generator assembly integrated in the module body;

[0009] The test head assembly is used to load the cigarette to be tested. The test head assembly is provided with the gas path interface required for testing. The main body of the module is provided with gas path channels that are connected to each gas path interface.

[0010] The valve control component includes several valves integrated into the main body of the module, used to control the opening and closing of each air passage, so as to realize the opening and closing of the air passage required for suction resistance test or ventilation test.

[0011] The sensor assembly includes a ventilation test assembly and a suction resistance test assembly. Different air paths are opened through the valve control assembly to complete the ventilation test and suction resistance test.

[0012] The negative pressure generator assembly is connected to the test head assembly via an air path, and is used to generate a negative pressure airflow of standard flow rate in the test head.

[0013] Based on the above, the main body of the module includes a first valve plate, a second valve plate, and a control board. The first valve plate integrates the test head assembly and some valve components, the second valve plate integrates the air path and another part of the valve components, and the control board integrates the sensor assembly. The first valve plate, the second valve plate, and the control board are tightly fixed together by assembly.

[0014] Based on the above, the test head assembly includes a test head with a vertical channel, a plurality of cigarette seals disposed in the vertical channel, a cigarette positioning device, and an end sealing cap;

[0015] The cigarette sealing component is used for segmented sealing of the cigarette and includes a latex film holder and a latex film installed in a vertical channel. The latex film holder and the test head are provided with negative pressure channels for driving the latex film to shrink. Each negative pressure channel is controlled by a latex film control valve. Each latex film control valve is connected to the negative pressure generator assembly through an air passage.

[0016] The cigarette positioning device is located at the bottom of the vertical channel to constrain the height of the cigarette entering the vertical channel, and the end sealing cap is used to seal the bottom outlet of the vertical channel.

[0017] Based on the above, the test head is provided with a paper ventilation measurement port, a mouth ventilation measurement port and a total flow port in sequence from top to bottom along the vertical channel. The adjacent measurement ports and the paper ventilation measurement port are separated from the upper inlet of the vertical channel by the cigarette sealing element.

[0018] The paper ventilation measurement port and the mouth ventilation measurement port are respectively connected to the ventilation measurement component through an air path and a matching ventilation control valve;

[0019] The total flow port is connected to the negative pressure generator assembly through the air passage and the total flow valve to generate a negative pressure airflow of standard flow rate;

[0020] A pressure interface is led out from the gas path channel connected to the total flow port for connecting the suction resistance test component.

[0021] Based on the above, the negative pressure generator assembly includes a negative pressure generator, a filter device, and a constant flow orifice connected in sequence, and the negative pressure generator is connected to the atmosphere.

[0022] Based on the above, the ventilation control valve includes a first control valve, a second control valve, and a third control valve. The first control valve, the second control valve, and the third control valve are all two-position three-way valves. The first control valve, in conjunction with the total flow valve, is used to open and close the paper ventilation measurement port. The third control valve, in conjunction with the total flow valve, is used to open and close the nozzle ventilation measurement port. The total flow valve and the second control valve are respectively connected to the first control valve and the third control valve, and are used to calibrate the laminar flow modules for paper ventilation measurement and nozzle ventilation measurement.

[0023] Based on the above, the cigarette positioning mechanism includes an operating hole located at the lower part of the test head and inclined, into which a pin is inserted. The pin is retractable and enters the vertical channel to form a positioning block, and the pin is in a movable sealing fit with the operating hole.

[0024] Based on the above, the test head is configured as a multi-stage threaded sleeve structure.

[0025] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model has the following advantages:

[0026] This invention integrates all the components required for ventilation and suction resistance testing into a closed, valve-block-like structure, thus solidifying the air path structure. The valve body, test head, and sensor assembly are all assembled in a packaged manner, resulting in a highly integrated testing device. It can be output as a standard product at the production end without the need for assembly operations. Only calibration is required at the factory and during installation, eliminating the need for complex adjustments and greatly saving time. Due to the higher integration, especially the stable air path and valve path structure, it is less prone to wear and tear and assembly errors.

[0027] Furthermore, the structure is divided into three main modules in terms of overall design, which integrate the test head, valve circuit and control board respectively. They can be replaced as a whole, and the stability is still guaranteed after replacement. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the internal structure of the suction resistance ventilation rate testing integrated module in this utility model.

[0029] Figure 2 This is a three-dimensional view of the integrated module for testing suction resistance ventilation rate in this utility model.

[0030] Figure 3 This is a front view of the integrated module for testing suction resistance ventilation rate in this utility model.

[0031] In the diagram: 1. Main module body; 10. First valve plate; 20. Second valve plate; 30. Control board;

[0032] 11. Test head; 12. Cigarette seal; 13. Cigarette positioning mechanism; 14. End sealing cap; 15. Latex diaphragm control valve; 16. Paper ventilation measurement port; 17. Mouth ventilation measurement port; 18. Total flow port;

[0033] 21. First control valve; 22. Second control valve; 23. Third control valve; 24. Total flow valve; 31. Ventilation test assembly; 32. Suction resistance test assembly; 41. Negative pressure generator; 42. Filter device; 43. Constant flow orifice; 44. Laminar flow module in the paper ventilation rate air circuit; 45. Laminar flow module in the nozzle ventilation rate air circuit. Detailed Implementation

[0034] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0035] like Figures 1-3 As shown, an integrated module for testing suction resistance ventilation rate includes a module body 1 and a test head assembly, a valve control assembly, a sensor assembly, and a negative pressure generator assembly integrated in the module body 1.

[0036] The test head assembly is used to load the cigarette to be tested. The test head assembly is provided with the gas path interface required for testing. The main body of the module is provided with gas path channels that are connected to each gas path interface.

[0037] Specifically, the test head assembly includes a test head 11 with a vertical channel, a plurality of cigarette seals 12 disposed in the vertical channel, a cigarette positioning mechanism 13 for cigarette positioning, and an end sealing cap 14.

[0038] The cigarette sealing component 12 includes a latex film holder and a latex film inserted into a vertical channel. The latex film holder and the test head are provided with negative pressure channels for driving the latex film to shrink. Each negative pressure channel is controlled by a latex film control valve 15. Each latex film control valve 15 is connected to a negative pressure generator assembly through an air passage. In this embodiment, there are three cigarette sealing components 12, and the corresponding number of latex film control valves 15 is also three.

[0039] The test head 11 is configured with a multi-stage threaded sleeve structure to facilitate the installation of the cigarette seal 12.

[0040] The working principle of the cigarette seal 12 is as follows: There is a round hole in the middle of the latex film fixing frame. The latex film is a cylindrical latex film. The inner diameter of the inner hole of the latex film is smaller than the diameter of the cigarette, so it can clamp and lock the cigarette and play a sealing role. The negative pressure channel is connected to the latex film fixing frame. When the negative pressure is conducted, the latex film is deformed under the influence of the negative pressure, the inner diameter expands, the channel becomes larger, the cigarette loses its restraint, and can fall down.

[0041] This method is a standard way to lock the cigarette and ensure a seal.

[0042] The cigarette positioning mechanism 13 includes an operating hole located at the lower part of the test head and inclined. A pin is inserted into the operating hole and can extend and retract into the vertical channel to form a positioning block. The pin and the operating hole are in a movable sealing fit. The cigarette positioning device is located at the lower part of the vertical channel to constrain the height of the cigarette entering the vertical channel. The end sealing cap is used to seal the bottom outlet of the vertical channel.

[0043] Specifically, the pin only extends into the vertical channel during the insertion of the cigarette to be tested. During the testing process and the removal of the cigarette, it needs to exit the vertical channel. This operation can be controlled manually or by installing an electrically controlled moving mechanism.

[0044] The test head 11 is provided with a paper ventilation measurement port 16, a mouth ventilation measurement port 17 and a total flow port 18 in the vertical channel from top to bottom. The adjacent measurement ports and the paper ventilation measurement port and the upper inlet of the vertical channel are separated by the cigarette seal.

[0045] The valve control assembly includes several valves integrated into the main module body, used to control the opening and closing of various air passages to realize the opening and closing of the air passages required for suction resistance testing or ventilation testing. The sensor assembly includes a ventilation testing assembly 31 and a suction resistance testing assembly 32.

[0046] Specifically, the paper ventilation measurement port 16 and the mouth ventilation measurement port 17 are respectively connected to the ventilation measurement component through an air path and a matching ventilation control valve;

[0047] A pressure interface is led out from the gas path channel connected to the total flow port for connecting the suction resistance test component 32.

[0048] In this embodiment, the ventilation control valve includes a first control valve 21, a second control valve 22, and a third control valve 23. All three valves are two-position three-way valves. The first control valve 21, in conjunction with the total flow valve 24, is used to open and close the paper ventilation measurement port 16. The third control valve 23, in conjunction with the total flow valve 24, is used to open and close the mouth ventilation measurement port 17. The total flow valve 24 and the second control valve 22, respectively, work with the first control valve 21 and the third control valve 23 for the calibration of the laminar flow module in the ventilation measurement and suction resistance measurement air path. Specific connection methods are shown in the attached figure. Figure 1 As shown by the dashed line.

[0049] The negative pressure generator assembly is connected to the test head assembly via an air path, and is used to generate a negative pressure airflow of standard flow rate in the test head.

[0050] Specifically, in this embodiment, the negative pressure generator assembly includes a negative pressure generator 41, a filter device 42, and a constant flow orifice 43 connected in sequence. The total flow port is connected to the negative pressure generator assembly through an air passage and a total flow valve to generate a negative pressure airflow of standard flow rate. The negative pressure generator 41 is connected to the atmosphere and its main function is to connect to the vertical channel, corresponding to the mouthpiece end of the cigarette to be tested, to form a standard airflow of 17.5 mL / s.

[0051] From the assembly design, the various functional modules are divided. The main body of the module includes a first valve plate 10, a second valve plate 20 and a control plate 30. The first valve plate 10 integrates the test head assembly and some valves, mainly including a latex membrane control valve for controlling the latex membrane and a gas passage.

[0052] The second valve plate 20 integrates the air circuit and another part of the valve components, mainly including the first control valve 21, the second control valve 22, the third control valve 23 and the total flow valve 24.

[0053] The control board integrates sensor components, including a ventilation test component 31 and a suction resistance test component 32. The ventilation test component 31 is a measurement component mainly composed of a flow meter, used to measure the air flow rate. The suction resistance test component 32 is a measurement component mainly composed of a differential pressure sensor, used to test the air pressure.

[0054] The first valve plate 10, the second valve plate, and the control plate are tightly fixed together by assembly to form a stable main structure to ensure the stability of the structure.

[0055] Working principle explanation:

[0056] The ventilation of a cigarette includes paper ventilation and filter ventilation. Paper ventilation refers to the ratio of the side ventilation volume in the cigarette rolling area to the main ventilation volume, while filter ventilation refers to the ratio of the side ventilation volume in the filter section to the main ventilation volume.

[0057] During the experiment, the main ventilation volume is usually controlled at a standard flow rate of 17.5 mL / s, and the flow rate of the side ventilation at the paper end or filter end is tested.

[0058] The draw resistance of a cigarette refers to the gas pressure drop at the cigarette filter outlet that can be detected in the main ventilation path when the main ventilation volume is 17.5 mL / s. This pressure drop is reflected by the pressure difference between the cigarette filter outlet and the atmosphere.

[0059] Based on the above fundamental principles, the working principle of this scheme during execution is as follows:

[0060] When the cigarette to be tested falls into the test head, the cigarette is wrapped, sealed and locked by the latex film, the lower sealing cap of the test head is closed, the negative pressure generator is started, and the 1 and 2 of the total flow valve 24 are turned on, generating a standard airflow of 17.5 mL / s. At this time, the draw resistance of the cigarette can be measured through port B.

[0061] Simultaneously, the first and second paths of the first control valve 21 are controlled to detect the paper ventilation rate; the first and second paths of the third control valve 23 are controlled to detect the nozzle ventilation rate.

[0062] After the test is completed, ends 1 and 2 of MV4, MV5, and MV6 are connected, controlling the opening of the cigarette seal 12, opening the lower end sealing cap, and the cigarette falls out and is discharged into the waste trough below.

[0063] During the calibration process, the cigarette is wrapped, sealed and locked by a latex film, the lower end of the test head is closed, the negative pressure generator is activated, and the 1 and 2 of the total flow valve 24 are turned on to generate a standard airflow of 17.5 mL / s.

[0064] Simultaneously, the second and third paths of the first control valve 21 are opened, and the first and second paths of the second control valve 22 are opened, so as to calibrate the laminar flow module 44 in the paper ventilation rate air path; after the laminar flow module 44 in the paper ventilation rate air path is calibrated, the second and third paths of the second control valve 22 are switched to open, and then the second and third paths of the third control valve 23 are opened, so as to calibrate the laminar flow module 45 in the nozzle ventilation rate air path.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. An integrated module for testing suction resistance ventilation rate, characterized in that: It includes a main module body and a test head assembly, a valve control assembly, a sensor assembly, and a negative pressure generator assembly integrated within the main module body; The test head assembly is used to load the cigarette to be tested. The test head assembly is provided with the gas path interface required for testing. The main body of the module is provided with gas path channels that are connected to each gas path interface. The valve control component includes several valves integrated into the main body of the module, used to control the opening and closing of each air passage, so as to realize the opening and closing of the air passage required for suction resistance test or ventilation test. The sensor assembly includes a ventilation test assembly and a suction resistance test assembly. Different air paths are opened through the valve control assembly to complete the ventilation test and suction resistance test. The negative pressure generator assembly is connected to the test head assembly via an air path, and is used to generate a negative pressure airflow of standard flow rate in the test head.

2. The integrated module for testing suction resistance ventilation rate according to claim 1, characterized in that: The main body of the module includes a first valve plate, a second valve plate, and a control board. The first valve plate integrates the test head assembly and some valve components. The second valve plate integrates the air path and another part of the valve components. The control board integrates the sensor assembly. The first valve plate, the second valve plate, and the control board are tightly fixed together by assembly.

3. The resistance vent rate test integrated module of claim 2, wherein: The test head assembly includes a test head with a vertical channel, several cigarette seals disposed in the vertical channel, a cigarette positioning mechanism for cigarette positioning, and an end sealing cap. The cigarette sealing component includes a latex film holder and a latex film inserted into a vertical channel. The latex film holder and the test head are provided with negative pressure channels for driving the latex film to shrink. Each negative pressure channel is controlled by a latex film control valve. Each latex film control valve is connected to the negative pressure generator assembly through an air passage. The cigarette positioning device is located at the bottom of the vertical channel to constrain the height of the cigarette entering the vertical channel, and the end sealing cap is used to seal the bottom outlet of the vertical channel.

4. The resistance vent rate test integrated module of claim 3, wherein: The test head is provided with a paper ventilation measurement port, a mouth ventilation measurement port and a total flow port in the vertical channel from top to bottom. The adjacent measurement ports and the paper ventilation measurement port are separated from the upper inlet of the vertical channel by the cigarette sealing element. The paper ventilation measurement port and the mouth ventilation measurement port are respectively connected to the ventilation measurement component through an air path and a matching ventilation control valve; The total flow port is connected to the negative pressure generator assembly through the air passage and the total flow valve to generate a negative pressure airflow of standard flow rate; A pressure interface is led out from the gas path channel connected to the total flow port for connecting the suction resistance test component.

5. The resistance vent rate test integrated module of claim 4, wherein: The negative pressure generator assembly includes a negative pressure generator, a filter device, and a constant flow orifice connected in sequence, with the negative pressure generator connected to the atmosphere.

6. The resistance vent rate test integrated module of claim 5, wherein: The ventilation control valve includes a first control valve, a second control valve, and a third control valve. The first, second, and third control valves are all two-position three-way valves. The first control valve, in conjunction with the total flow valve, is used to open and close the paper ventilation measurement port. The third control valve, in conjunction with the total flow valve, is used to open and close the nozzle ventilation measurement port. The total flow valve and the second control valve are respectively connected to the first and third control valves and are used to calibrate the laminar flow modules for paper ventilation measurement and nozzle ventilation measurement.

7. The integrated module for testing suction resistance ventilation rate according to claim 6, characterized in that: The cigarette positioning mechanism includes an operating hole located at the lower part of the test head and inclined. A pin is inserted into the operating hole and can extend and retract into the vertical channel to form a positioning block. The pin and the operating hole are in a movable sealing fit.

8. The integrated module for testing suction resistance ventilation rate according to claim 7, characterized in that: The test head is configured as a multi-stage threaded sleeve structure.

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