A length-adjustable variable resistance suction resistance standard rod

Abstract

This invention provides an adjustable-length variable-resistance standard bar, comprising a body section and an adjustment section made of inert material. The body section is cylindrical, and its interior contains several parallel airflow channels. The adjustment section includes a sleeve-mounted movable part and a channel part. The sleeve-mounted movable part is axially movable and fits onto the body section, while the channel part contains several parallel airflow channels. The suction resistance is adjusted by changing the overall length of the body section and the adjustment section. This adjustable-length variable-resistance standard bar has the advantage of using an inert material to construct a variable-resistance function.

Description

Technical Field

[0001] This utility model relates to the field of calibration equipment technology, specifically to a variable resistance standard bar with adjustable length. Background Technology

[0002] The draw resistance of cigarettes and filters is an important part of the overall quality parameters of cigarettes. It directly determines the smoking experience of cigarettes, and therefore constitutes an important part of the cigarette and filter testing process, with relevant standards set in the industry.

[0003] The detection of suction resistance value requires suction resistance testing equipment. As a measuring instrument, suction resistance testing equipment needs to be calibrated regularly. Suction resistance standard rod is a standard instrument with fixed parameters, which is used specifically for calibrating suction resistance testing equipment.

[0004] In the functional design of the resistance standard bar, an important aspect is to ensure the stability of the parameters and prevent them from changing their properties due to changes in environmental factors such as time and space. Therefore, most current resistance standard bars are made of quartz glass with a built-in capillary hole to construct a specific resistance value. Since the resistance value is fixed, a set of resistance standard bars is usually required for calibration tasks, which is relatively cumbersome and lacks flexibility.

[0005] While it is possible to change the resistance value through design techniques, thereby achieving variable resistance, structural designs based on commonly used inert materials, such as quartz glass, need to consider the material characteristics, which may hinder the achievement of variable resistance.

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

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a length-adjustable variable resistance standard bar based on an inert material and incorporating a variable resistance function.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: a variable resistance standard bar with adjustable length, comprising a body section and an adjustment section made of inert material;

[0009] The main body section is cylindrical, and several parallel airflow channels are arranged inside the main body section.

[0010] The adjustment section includes a sleeved movable part and a channel part. The sleeved movable part is used to be axially movable and fitted onto the outside of the main body section. The channel part is provided with several airflow channels that are parallel to each other.

[0011] The suction resistance is adjusted by changing the overall length of the main body section and the adjustment section.

[0012] Based on the above, the inner end of the main body section is provided with several protruding guide posts, and the airflow channel of the main body section passes through the interior of each guide post. The outer diameter of the guide post is adapted to the inner diameter of the airflow channel in the channel section, so that the guide post is slidably disposed in the airflow channel of the channel section.

[0013] Based on the above, a sliding sealing ring is provided on the inner side of the sliding part relative to the outer side of the main body section.

[0014] Based on the above, a sliding sealing ring is provided on the outer surface of the guide post relative to the inner surface of the airflow channel in the channel portion.

[0015] Based on the above, the inert material is quartz glass, polytetrafluoroethylene, or inert ceramic.

[0016] Based on the above, the body section or adjustment section is provided with a scale on its exterior.

[0017] Based on the above, the body segment and the adjustment segment are connected by a sliding method, and the body segment and the adjustment segment are locked by friction.

[0018] Based on the above, the main body section is provided with an external thread, and the inner surface of the sleeve movable part of the adjusting section is provided with a matching internal thread. The main body section and the adjusting section are connected by a thread.

[0019] Based on the above, the length adjustment range of the main body segment and the adjustment segment is 6cm-13cm.

[0020] Based on the above, the number of airflow channels in the main body section and the number of airflow channels in the regulating section are equal and both are ≥3.

[0021] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model is based on the characteristics of inert materials. Inert materials have good stability, but their structures are usually easily damaged, such as being fragile and easily deformed under stress. Therefore, they are not easy to design into complex structural forms. This utility model simply divides them into two-section sleeve structures, with airflow channels built into each section. By simply adjusting the length, the suction resistance can be changed. This not only retains the stability advantage of inert materials, but also achieves the purpose of adjusting the suction resistance, so that even a single suction rod can be used in complex environments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the external structure of the adjustable-length variable resistance standard bar in this utility model.

[0023] Figure 2This is a schematic diagram of the adjustable-length variable resistance standard bar in Embodiment 1 of this utility model.

[0024] Figure 3 This is a schematic diagram of the adjustable-length variable resistance standard bar in Embodiment 2 of this utility model.

[0025] In the diagram: 1. Main body section; 2. Adjustment section; 11. First airflow channel; 12. Guide column; 21. Sleeve-fitting movable part; 22. Channel part; 23. Second airflow channel. Detailed Implementation

[0026] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0027] Example 1

[0028] like Figure 1 and Figure 2 As shown, a variable resistance standard bar with adjustable length includes a body section 1 and an adjustment section 2 made of inert material.

[0029] The main body section 1 is cylindrical, and the main body section 1 is provided with a plurality of parallel first airflow channels 11, the number of which is ≥3.

[0030] The adjustment section 2 includes a sleeve movable part 21 and a channel part 22. The sleeve movable part 21 is used to be axially movable and fitted onto the outside of the main body section 1. The channel part 22 is provided with a plurality of parallel second airflow channels 23.

[0031] The suction resistance is adjusted by changing the overall length of the main body section and the adjustment section.

[0032] In this embodiment, the inert material is polytetrafluoroethylene (PTFE). The connection between the main body section 1 and the adjusting section 2 is achieved by a threaded engagement. That is, the main body section 1 is threaded on the outside, and the inner surface of the connecting movable part 21 is threaded with a matching thread. A sliding sealing ring (not shown in the figure) is installed on the mating surface of the two. The axial length is changed by adjusting the spiral of the two, thereby changing the suction resistance value.

[0033] To facilitate the setting and adjustment of the suction resistance value, a scale can be set at the position where the main body section 1 and the adjustment section 2 meet. The correspondence between the scale value and the suction resistance value can be established based on experiments, so that both can be adjusted.

[0034] Regarding the length setting, the length adjustment range of the main body section 1 and the adjustment section 2 is 6cm-13cm, which is compatible with the length of most standard bars currently available, in order to avoid compatibility issues.

[0035] Example 2

[0036] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that the inert material is quartz glass, the connection between the main body 1 and the adjusting section 2 is a sliding connection, and a sliding sealing ring (not shown in the figure) is installed on the sliding contact surface. Since there is no torsion under the sliding connection, a guide structure can be added. The inner end of the main body section 1 is provided with several protruding guide posts 12. The first airflow channel 11 of the main body section 1 passes through the interior of each guide post 12. The outer diameter of the guide post 12 is adapted to the inner diameter of the second airflow channel 23 in the channel section, so that the guide post 12 is slidably disposed in the second airflow channel 23 of the channel section.

[0037] In this embodiment, since it is difficult to process quartz glass into threaded structures, and the threaded structures are too small and easily broken, a sliding fit is adopted. At the same time, it is necessary to control the surface friction so that the self-locking of the main body 1 and the adjustment section 2 can be achieved by means of surface friction.

[0038] In practical use, the standard rod structures in the two embodiments described above can independently complete the tasks that would require a set of standard rods in the traditional method. By adjusting different resistance values ​​and placing them into the resistance detection device, different ranges of the resistance detection device can be calibrated.

[0039] 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. A length-adjustable variable resistance resistance standard rod, characterized by: It includes a body section and a regulating section made of inert materials; The main body section is cylindrical, and several parallel airflow channels are arranged inside the main body section. The adjustment section includes a sleeved movable part and a channel part. The sleeved movable part is used to be axially movable and fitted onto the outside of the main body section. The channel part is provided with several airflow channels that are parallel to each other. The suction resistance is adjusted by changing the overall length of the main body section and the adjustment section.

2. The length adjustable variable resistance draft standard stick of claim 1, wherein: The inner end of the main body section is provided with several protruding guide posts, and the airflow channel of the main body section passes through the interior of each guide post. The outer diameter of the guide post is adapted to the inner diameter of the airflow channel in the channel section, so that the guide post is slidably disposed in the airflow channel of the channel section.

3. A length adjustable variable resistance resistance standard rod according to claim 1 or 2, characterized in that: A sliding sealing ring is provided on the inner side of the sliding part relative to the outer side of the main body section.

4. The length adjustable variable resistance draft standard stick of claim 2, wherein: A sliding sealing ring is provided on the outer surface of the guide post relative to the inner surface of the airflow channel in the channel section.

5. The length adjustable variable resistance draft standard stick according to claim 1 or 2 or 4, wherein: The inert material is quartz glass, polytetrafluoroethylene, or inert ceramic.

6. The length adjustable variable resistance draft standard stick according to claim 1 or 2 or 4, wherein: The body section or adjustment section is provided with scales on its exterior.

7. The length adjustable variable resistance draft standard stick according to claim 1 or 2 or 4, wherein: The main body section and the adjustment section are connected by a sliding mechanism, and the main body section and the adjustment section are locked together by friction.

8. The length adjustable variable resistance draft standard stick of claim 1, wherein: The main body section is provided with an external thread, and the inner surface of the sleeve movable part of the adjustment section is provided with a matching internal thread. The main body section and the adjustment section are connected by threads.

9. The length adjustable variable resistance draft standard stick according to claim 1 or 2 or 4, wherein: The length adjustment range of the main body section and the adjustment section is 6cm-13cm.

10. The length-adjustable variable resistance standard bar according to claim 1, 2, or 4, characterized in that: The number of airflow channels in the main body section and the number of airflow channels in the regulating section are equal and both are ≥3.

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