Isolation hood of cigarette vacuum generator and draw resistance and ventilation rate measuring device thereof

Abstract

The utility model belongs to the technical field of cigarette performance testing, and particularly relates to an isolation hood of a cigarette vacuum generator and a suction resistance and ventilation rate measuring device of the isolation hood. The isolation hood comprises a bottom plate, a first vertical plate, a sliding piece and a cover shell, wherein the first vertical plate is vertically fixed on the bottom plate; the sliding piece is in sliding connection with the first vertical plate in the vertical direction, and the sliding piece comprises a second vertical plate arranged side by side with the first vertical plate; the cover shell is tightly buckled on the second vertical plate, the cover shell is hinged to the vertical side edge of the second vertical plate, and the vacuum generator is fixedly arranged in a cavity formed by the cover shell and the second vertical plate. According to the isolation hood, the vacuum generator and the measurement assembly can be isolated, airflow disturbance is effectively reduced, the stability of environment airflow is guaranteed, and therefore the accuracy of suction resistance and ventilation rate measurement results is improved; the isolation cover can be opened in the horizontal direction and the vertical direction so that the vacuum generator can be maintained conveniently, and the application range of the vacuum generator is widened.

Description

Technical Field

[0001] This utility model belongs to the field of cigarette performance testing technology, and specifically relates to an isolation cover for a cigarette vacuum generator and its suction resistance and ventilation rate measuring device. Background Technology

[0002] Cigarette draw resistance and ventilation rate are important indicators for evaluating the physical quality of cigarettes. They are closely related to the weight, circumference, and hardness of cigarettes, directly affecting the quality of cigarette packaging and, consequently, the sensory quality of the cigarette product. Excessive draw resistance makes the cigarette difficult to smoke, while insufficient resistance leads to excessive dilution of the smoke. Furthermore, cigarette draw resistance and ventilation rate provide important data support for reducing the tar and nicotine content in cigarette smoke.

[0003] The measurement of cigarette draw resistance is typically performed according to GB / T 22838.5-2009 "Determination of Physical Properties of Cigarettes and Filters - Part 5: Cigarette Draw Resistance and Filter Pressure Drop". The draw resistance is defined as follows: the cigarette is sealed in the measuring device, the output end is inserted to a depth of 9 mm, and a negative pressure is applied to the output end while maintaining a flow rate of 17.5 mL / s under the standard conditions of GB / T16447. The measurement of cigarette ventilation rate is typically performed according to GB / T 22838.15-2009 "Determination of Physical Properties of Cigarettes and Filters - Part 15: Cigarettes - Determination of Ventilation - Definition and Measurement Principle". The measurement principle is as follows: a constant airflow formed by inhalation flows through an unlit cigarette in the standard smoke airflow direction. The ventilation rate is measured at various parts of the cigarette, and then calculated.

[0004] Currently, most suction resistance and ventilation rate measuring instruments produced by various manufacturers use vacuum generators for negative pressure suction, creating a negative pressure airflow of 17.5 mL / s through a constant flow element. The airflow in the pipeline is then processed by a suction resistance differential pressure sensor and a ventilation rate differential pressure sensor to obtain the corresponding negative pressure resistance value, from which the suction resistance and ventilation rate values ​​are calculated. Because the differential pressure sensor works by comparing the pressure value in the measuring pipeline with the ambient air pressure around the sensor, and the vacuum generator continuously exhausts air during operation, disturbing the ambient airflow inside the measuring unit, and because the differential pressure sensor needs to collect a zero point during measurement, the stability of the ambient airflow in the suction resistance and ventilation rate measuring unit is particularly important. Commercially available suction resistance and ventilation rate measuring instruments typically only increase the distance between the vacuum generator and the differential pressure sensor to reduce airflow influence, but this does not effectively solve the problem of airflow disturbance caused by the vacuum generator's exhaust. Summary of the Invention

[0005] The purpose of this invention is to address the problem in existing instruments for measuring suction resistance and ventilation rate that suffer from fluctuations in measurement results due to interference from the exhaust gas from the vacuum generator affecting the differential pressure sensor's operating environment. This invention proposes an isolation cover for a cigarette vacuum generator and its corresponding suction resistance and ventilation rate measuring device. By placing an isolation cover between the vacuum generator and the measuring components, airflow disturbance is effectively reduced, ensuring the stability of the ambient airflow and thus improving the accuracy of suction resistance and ventilation rate measurements. Furthermore, the isolation cover can be opened horizontally and vertically for maintenance of the vacuum generator, expanding the applicability of this invention.

[0006] To achieve the above objectives, the technical solution adopted is:

[0007] An isolation cover for a cigarette vacuum generator, wherein the top surface and side surface of the vacuum generator have a first working hole and a second working hole, respectively, and the isolation cover includes:

[0008] Base plate;

[0009] The first upright plate is vertically fixed to the base plate;

[0010] A sliding member is slidably connected to the first upright plate in a vertical direction, and the sliding member includes a second upright plate arranged side by side with the first upright plate;

[0011] The cover is tightly fastened to the second vertical plate, and the cover is hinged to the vertical side of the second vertical plate. The vacuum generator is fixed in the cavity formed by the cover and the second vertical plate.

[0012] According to the isolation cover of the cigarette vacuum generator of this utility model, the first upright plate is provided with a guide groove in the vertical direction, and a lead screw is installed in the guide groove.

[0013] According to the isolation cover of the cigarette vacuum generator of this utility model, a groove is further provided on one side of the first upright plate in the vertical direction.

[0014] According to the isolation cover of the cigarette vacuum generator of this utility model, a guide block is further fixed at the bottom of the second vertical plate, the guide block is slidably disposed in the guide groove, and the guide block is fixedly connected to the bottom of the lead screw.

[0015] According to the isolation cover of the cigarette vacuum generator of this utility model, the sliding member further includes a sliding plate fixedly connected to the second vertical plate, and the sliding plate and the sliding groove are slidably connected in the vertical direction.

[0016] According to the isolation cover of the cigarette vacuum generator of this utility model, a first through hole corresponding to the first working hole is provided on the top surface of the cover, and the first through hole has the same radius as the first working hole; a second through hole corresponding to the second working hole is provided on the side surface of the cover, and the second through hole has the same radius as the second working hole.

[0017] According to the isolation cover of the cigarette vacuum generator of this utility model, the cover and the second upright plate are tightly fastened together by a locking member.

[0018] According to the isolation cover of the cigarette vacuum generator of this utility model, a third working hole is further provided on the bottom plate, and the third working hole is located directly below the vacuum generator.

[0019] This utility model also proposes a device for measuring suction resistance and ventilation rate, comprising:

[0020] The aforementioned isolation cover for the cigarette vacuum generator;

[0021] A differential pressure sensor for suction resistance is used to measure the suction resistance of cigarettes. The differential pressure sensor for suction resistance is fixed on the base plate.

[0022] And a ventilation rate differential pressure sensor, which is used to measure the ventilation rate of cigarettes, is fixed on the base plate.

[0023] The beneficial effects achieved by adopting the above technical solution are:

[0024] (1) The isolation cover of the cigarette vacuum generator of this utility model adopts a dual opening method of sliding and rotation. Users can choose different opening methods (sliding upward or rotating to open) according to actual needs, which improves the flexibility and convenience of the device. When it is necessary to frequently change or adjust the position of the vacuum generator, sliding opening can save space and make operation simpler; while rotating opening is convenient for internal maintenance or cleaning, meeting the needs of different usage scenarios.

[0025] (2) In the suction resistance and ventilation rate measuring device of this utility model, when the detection device measures the suction resistance and ventilation rate, the gas discharged by the vacuum generator is guided to the outside of the detection device through the corresponding third working hole on the base plate, which creates a stable airflow environment around the suction resistance differential pressure sensor and the ventilation rate differential pressure sensor, ensuring the accuracy of the zero point data and working data collected by the differential pressure sensor, thereby greatly improving the accuracy, repeatability and consistency of the measurement results.

[0026] (3) The isolation cover of the cigarette vacuum generator of this utility model and its suction resistance and ventilation rate measuring device adopt a modular design and have a simple structure. At the same time, it can utilize the design concept of isolating and guiding the exhaust airflow of the vacuum generator, which has a wide range of applications, high practicality, and saves design costs and R&D cycle. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments of this utility model will be briefly described below. The drawings are merely illustrative of some embodiments of this utility model and are not intended to limit the scope of all embodiments of this utility model.

[0028] Figure 1 This is a schematic diagram of the structure of the isolation cover of the cigarette vacuum generator according to Embodiment 1 of this utility model;

[0029] Figure 2 This is an exploded view of the isolation cover of the cigarette vacuum generator according to Embodiment 1 of this utility model;

[0030] Figure 3 This is a schematic diagram of the sliding component of the cigarette vacuum generator according to Embodiment 1 of this utility model.

[0031] Figure 4 This is a schematic diagram of the suction resistance and ventilation rate measuring device according to Embodiment 2 of this utility model;

[0032] The meanings of the serial numbers in the diagram are as follows:

[0033] 1. Measuring head, 2. Ventilation assembly, 3. Ventilation rate differential pressure sensor, 4. Constant flow element, 5. Solenoid valve assembly, 6. Suction resistance differential pressure sensor, 7. Filter element;

[0034] 8. Airflow isolation module;

[0035] 801. First vertical plate; 8011. Guide groove; 8012. Nut; 8013. Lead screw; 8014. Slide groove;

[0036] 802. Sliding component; 8021. Second upright plate; 8022. Sliding plate; 8023. Guide block;

[0037] 803. Cover shell; 8031. First through hole; 8032. Second through hole;

[0038] 804. Locking components;

[0039] 805. Vacuum generator; 8051. First working hole; 8052. Second working hole;

[0040] 9. Base plate. Detailed Implementation

[0041] The following description, in conjunction with the accompanying drawings of specific embodiments of the present invention, will provide a clear and complete illustration of exemplary solutions. Unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by one of ordinary skill in the art.

[0042] Example 1

[0043] like Figures 1-4 As shown, the isolation cover of the cigarette vacuum generator in this embodiment has a first working hole 8051 and a second working hole 8052 on its top and side surfaces, respectively. The isolation cover includes a base plate, a first vertical plate, a sliding member, and a cover. The first vertical plate 801 is vertically welded and fixed to the base plate 9; the sliding member 802 is slidably connected to the first vertical plate 801 in the vertical direction, and the sliding member 802 includes a second vertical plate 8021 arranged side by side with the first vertical plate 801; the cover 803 is tightly fastened to the second vertical plate 8021, and the cover 803 is hinged to the vertical side edge of the second vertical plate 8021; the vacuum generator 805 is welded to the base plate 9, and the vacuum generator 805 is disposed in the cavity formed by the cover 803 and the second vertical plate 8021. This isolation cover can be vertically slidable or rotated open, and can be adapted to different through holes, providing structural flexibility and operational convenience. Vertical sliding saves space and is convenient and fast, while the rotating design provides more operating space, making it suitable for maintenance and debugging and improving equipment efficiency.

[0044] like Figure 1 As shown, the first vertical plate 801 has a guide groove 8011 in the vertical direction, and a lead screw 8013 is installed in the guide groove 8011. Furthermore, a nut 8012 is screwed to the top of the lead screw 8013, and rotating the nut 8012 can drive the lead screw 8013 to rotate and move in the vertical direction.

[0045] Furthermore, such as Figure 1 and Figure 2 As shown, a groove 8014 is provided on one side of the first vertical plate 801 along the vertical direction.

[0046] like Figure 2 and Figure 3 As shown, a guide block 8023 is welded and fixed to the bottom of the second vertical plate 8021. The guide block 8023 is slidably disposed in the guide groove 8011 of the first vertical plate 801, and the guide block 8023 is welded and connected to the bottom of the lead screw 8013.

[0047] like Figure 2 and Figure 3 As shown, the slider 802 also includes a slide plate 8022 welded to the second vertical plate 8021, which slides in a vertical direction with the slide groove 8014 of the first vertical plate 801.

[0048] like Figure 2 and Figure 3 As shown, a first through hole 8031 ​​corresponding to the first working hole 8051 is provided on the top surface of the cover 803, and the radius of the first through hole 8031 ​​is the same as that of the first working hole 8051 of the vacuum generator 805; a second through hole 8032 corresponding to the second working hole 8052 of the vacuum generator 805 is provided on the side surface of the cover 803, and the radius of the second through hole 8032 is the same as that of the second working hole 8052. In this utility model, the first through hole 8031 ​​and the second through hole 8032 ensure the sealing of the first working hole 8051 and the second working hole 8052 of the vacuum generator 805 when connected to the surrounding detection device through the connecting pipe, and avoid the influence of the airflow generated by the vacuum generator 805 on the surrounding detection unit.

[0049] like Figure 2 and Figure 3 As shown, one end of the cover 803 and the second upright plate 8021 are hinged together, and the other end of the cover 803 and the second upright plate 8021 are tightly fastened together by a locking member. When the vacuum generator 805 is in operation, the locking member is tightly fastened, ensuring the airtightness of the isolation cover of the utility model.

[0050] Furthermore, the vacuum generator 805 is welded to the base plate 9, and the vacuum generator 805 is located in the cavity formed by the cover shell 803 and the second vertical plate 8021.

[0051] Furthermore, a third working hole (not shown in the figure) is provided on the base plate 9 directly below the vacuum generator 805 to discharge the gas generated by the vacuum generator 805.

[0052] Example 2

[0053] This embodiment provides a device for measuring suction resistance and ventilation rate, comprising the isolation cover of the cigarette vacuum generator described above, a suction resistance differential pressure sensor 6, and a ventilation rate differential pressure sensor 3. The suction resistance differential pressure sensor 6 is used to measure the suction resistance of the cigarette and is welded to the base plate 9; the ventilation rate differential pressure sensor 3 is used to measure the ventilation rate of the cigarette and is welded to the base plate 9.

[0054] like Figure 4 As shown, the vacuum generator 805 and its isolation cover together form the airflow isolation module 8.

[0055] like Figure 4 As shown, the suction resistance and ventilation rate measuring device further includes a measuring head 1, a ventilation assembly 2, a constant flow element 4, a solenoid valve assembly 5, and a filter element 7, all welded to the base plate 9. These components are connected to the suction resistance differential pressure sensor 6, the ventilation rate differential pressure sensor 3, and the airflow isolation module 8 via connecting pipes and wires (not shown in the figure).

[0056] Furthermore, the ventilation rate differential pressure sensor 6 mainly measures the ventilation resistance in the gas connection pipeline; the constant flow element 13 provides a constant gas flow rate of 17.5 mL / s to the chamber of the measuring head 1; and the suction resistance differential pressure sensor 3 mainly measures the suction resistance in the gas connection pipeline.

[0057] The working principle of this application is:

[0058] When performing measurement work:

[0059] S1. Insert the cigarette to be tested into the chamber inside the measuring head 1;

[0060] S2. The constant flow element 4 provides a stable airflow (17.5 mL / s), ensuring the constancy of the airflow. Controlled by the solenoid valve assembly 5, the airflow enters the measuring head 1 chamber at the set constant flow rate and remains stable.

[0061] S3. The vacuum generator 805 generates negative pressure by simulating the inhalation process, attracting airflow through the cigarette;

[0062] S4. The resistance encountered by the airflow during inhalation is measured by the suction resistance differential pressure sensor 6. The sensor 6 records the suction resistance generated when the airflow passes through the cigarette, and the suction resistance of the cigarette is calculated by the pressure difference of the airflow.

[0063] S5. When airflow passes through ventilation rate differential pressure sensor 3, the system measures the pressure difference generated during the process. Based on the pressure difference, the system calculates the ventilation rate of the airflow.

[0064] like Figure 4 As shown, it should be understood that during this process, since the vacuum generator 805 is completely sealed by its isolation cover, the gas generated by the vacuum generator 805 will not affect the detection components such as the ventilation rate differential pressure sensor 3 and the resistance differential pressure sensor 6, thus ensuring the accuracy of the cigarette's suction resistance and ventilation rate detection results.

[0065] When vacuum generator 805 requires maintenance:

[0066] In practical use, when the vacuum generator 805 needs maintenance, the isolation cover of this utility model can be opened by sliding and rotating, as follows:

[0067] On the one hand, if there are many detection components around the vacuum generator 805 in the horizontal direction, the nut 8012 can be rotated, and the second vertical plate 8021 will slide upward in the vertical direction through the lead screw 8013 and the guide block 8023, thereby causing the cover 803 to slide upward. This not only exposes the vacuum generator 805 for maintenance, but also prevents the isolation cover of this utility model from colliding with the surrounding (horizontal) detection components.

[0068] On the other hand, if there are many detection components around the vacuum generator 805 in the vertical direction, the cover 803 can be rotated directly to expose the vacuum generator 805. This not only allows for maintenance of the vacuum generator 805, but also prevents the isolation cover of this invention from colliding with the surrounding (vertical) detection components.

[0069] The two opening methods of the isolation cover provided by this utility model make the vacuum generator 805 suitable for different production conditions. This not only avoids the gas generated by the vacuum generator 805 from affecting the surrounding detection components, but also expands the scope of application of this utility model itself.

[0070] It should be noted that when one element is described as "connected," "coupled," or "connected" to another element, it can mean that they are directly connected, coupled, or connected. However, it should be understood that there may be intermediate elements between them; that is, it covers both direct and indirect connection positions.

[0071] It should be noted that the use of words such as "one" or "a" does not necessarily indicate a quantity limitation. Words such as "including" or "contains" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0072] It should be noted that terms such as "up," "down," "left," and "right," which indicate orientation or positional relationship, are only used to express relative positional relationship. They are used to facilitate the description of this utility model and do not mean that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0073] The preferred embodiments for implementing this utility model have been described in detail above. However, it should be understood that these embodiments are merely illustrative and not intended to limit the scope, application, or construction of this utility model in any way. The scope of protection of this utility model is defined by the appended claims and their equivalents. Those skilled in the art can make numerous modifications to the foregoing embodiments under the teachings of this utility model, and all such modifications fall within the scope of protection of this utility model.

Claims

1. A cover for a vacuum generator of a cigarette, said vacuum generator having a first working hole and a second working hole on a top surface and a side surface, respectively, characterized in that, The vacuum generator comprises: a bottom plate; a first vertical plate vertically fixed on the bottom plate; a sliding member slidably connected with the first vertical plate in the vertical direction, the sliding member comprising a second vertical plate arranged side by side with the first vertical plate; a cover tightly fastened on the second vertical plate, and the cover being hingedly connected with the vertical side of the second vertical plate, and the vacuum generator being fixed in the cavity formed by the cover and the second vertical plate.

2. The isolation shield for a cigarette vacuum generator according to claim 1, characterized in that The first vertical plate is provided with a guide groove in the vertical direction, and a screw rod is installed in the guide groove.

3. The isolation shield for a cigarette vacuum generator according to claim 1, wherein A sliding groove is formed in the vertical direction on one side of the first vertical plate.

4. The isolation shield for a cigarette vacuum generator according to claim 2, wherein A guide block is fixed on the bottom of the second vertical plate, and the guide block is slidably arranged in the guide groove, and the guide block is fixedly connected with the bottom of the screw rod.

5. The isolation shield for a cigarette vacuum generator according to claim 3, wherein The sliding member further comprises a sliding plate fixedly connected with the second vertical plate, and the sliding plate is slidably connected with the sliding groove in the vertical direction.

6. The isolation shield for a cigarette vacuum generator according to claim 1, wherein A first through hole corresponding to the first working hole is formed on the top surface of the cover, and the first through hole has the same radius as the first working hole. A second through hole corresponding to the second working hole is formed on the side surface of the cover, and the second through hole has the same radius as the second working hole.

7. The isolation shield for a cigarette vacuum generator according to claim 1, wherein The cover and the second vertical plate are tightly fastened by a locking member.

8. The isolation shield for a cigarette vacuum generator according to claim 1, wherein A third working hole is formed on the bottom plate, and the third working hole is located directly below the vacuum generator.

9. A draw resistance and airflow rate measuring device characterized by, The vacuum generator comprises: The isolation cover of the cigarette vacuum generator according to any one of claims 1-8; a suction resistance differential pressure sensor for measuring the suction resistance of the cigarette, the suction resistance differential pressure sensor being fixed on the bottom plate; and a ventilation rate differential pressure sensor for measuring the ventilation rate of the cigarette, the ventilation rate differential pressure sensor being fixed on the bottom plate.

Images