An adjustable resistance standard rod

Abstract

This invention provides an adjustable suction resistance standard rod, comprising a standard rod body, a movable sleeve, and a flexible tube. The standard rod body has a built-in first airflow channel and is provided with a gas inlet / outlet. The movable sleeve has a built-in second airflow channel and is provided with a gas outlet / inlet. The movable sleeve is fitted onto the outside of the standard rod body and slides and locks along the axial direction of the standard rod body to achieve overall length adjustment. One end of the flexible tube is connected to the standard rod body, and the other end is connected to the movable sleeve. The first and second airflow channels are connected through the flexible tube to form a complete airflow channel. By adjusting the position of the movable sleeve, the length of the complete airflow channel and the inner diameter of the flexible tube are changed to achieve suction resistance adjustment. This adjustable suction resistance standard rod, through its telescopic movement, controls the length of the airflow channel and the size of the local tube diameter, thus achieving adjustable suction resistance.

Description

Technical Field

[0001] This utility model relates to the field of standard instrument technology, specifically to an adjustable suction resistance standard rod. Background Technology

[0002] The draw resistance and pressure drop of cigarettes are among the physical performance indicators of cigarettes and filter rods, and are also core indicators for evaluating the quality of cigarettes and filter rods. The tobacco industry generally uses draw resistance testing equipment, such as testing equipment based on smoking machines, to test draw resistance and pressure drop.

[0003] As a testing device, industry regulations require it to be calibrated regularly to ensure its accuracy.

[0004] A suction resistance standard bar is a standard bar used to calibrate suction resistance testing equipment. It is usually designed with a structure containing several capillary pores. Through the control of the manufacturing process, it has a constant suction resistance value, which is used to perform the calibration task of suction resistance testing equipment.

[0005] However, different suction resistance testing devices require different calibration parameters, and the same suction resistance device also requires different calibration parameters under different suction resistance ranges. This leads to the need for matching standard bars of appropriate size for use. Therefore, suction resistance standard bars usually come in groups. During the calibration process, it is necessary to frequently disassemble and reassemble the suction resistance standard bars for switching, which lacks operational convenience.

[0006] To improve ease of operation, those skilled in the art continue to refine existing standard bars.

[0007] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0008] The purpose of this invention is to address the shortcomings of existing technologies by providing a standard suction rod that allows for adjustment of the airflow channel length and local inner diameter through changes in its telescopic length, thereby enabling adjustable suction resistance.

[0009] To achieve the above objectives, the technical solution adopted by this utility model is: an adjustable suction resistance standard rod, comprising a standard rod body, a movable sleeve, and a flexible tube.

[0010] The standard rod body has a built-in first airflow channel and is equipped with a gas inlet / gas outlet;

[0011] The movable sleeve has a built-in second airflow channel and is equipped with a gas outlet / gas inlet;

[0012] The movable sleeve is fitted onto the outside of the standard rod body and slides and locks along the axial direction of the standard rod body to achieve adjustment of the overall length;

[0013] One end of the flexible tube is connected to the standard rod body, and the other end is connected to the movable sleeve. The first airflow channel and the second airflow channel are connected through the flexible tube to form a complete airflow channel.

[0014] By adjusting the position of the movable sleeve, the length of the complete airflow channel and the inner diameter of the flexible tube can be changed to achieve suction resistance adjustment.

[0015] Based on the above, the flexible tube is a rubber tube.

[0016] Based on the above, a spring is embedded in the rubber tube.

[0017] Based on the above, a limiting groove is provided on the standard rod body corresponding to the movable sleeve to limit the movement stroke of the movable sleeve, and a limiting block is provided on the movable sleeve corresponding to the limiting groove.

[0018] Based on the above, the complete airflow channel formed by the first airflow channel, the second airflow channel, and the flexible tube is a straight airflow channel.

[0019] Based on the above, the complete airflow channel formed by the first airflow channel, the second airflow channel, and the flexible tube is an airflow channel with a bend.

[0020] Based on the above, the frictional force between the standard rod body and the movable sleeve is greater than the self-resetting elastic force of the flexible tube, so as to achieve the self-locking of the movable sleeve.

[0021] Based on the above, an operating ring is provided on the standard rod body corresponding to the movable area of ​​the movable sleeve. The operating ring is threaded to the outer wall of the movable sleeve and rotates with the standard rod body. The movable sleeve is driven to move axially by rotating the operating ring.

[0022] Based on the above, an operating ring is provided on the standard rod body corresponding to the movable area of ​​the movable sleeve. The operating ring is threaded to the outer wall of the movable sleeve and rotates with the standard rod body. The movable sleeve is driven to move axially by rotating the operating ring.

[0023] Based on the above, the standard rod body is provided with a scale corresponding to the movable sleeve.

[0024] This invention has substantial features and advancements compared to existing technologies. Specifically, this invention designs the suction resistance standard rod as a structure with a telescopic length and adds a flexible tube to the internal air path design. When stretching occurs, the overall length of the airflow channel changes, which will bring about a certain degree of change in suction resistance. At the same time, the flexible tube narrows locally due to stretching deformation, and the inner diameter becomes smaller, which further changes the suction resistance. The combination of the two achieves the superposition of changes in suction resistance value, constructing a standard rod structure that changes the suction resistance value by changing the length of the standard rod, making the application of the standard rod more flexible and convenient. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the initial state of the adjustable suction resistance standard bar in Embodiment 1 of this utility model.

[0026] Figure 2 This is a schematic diagram of the adjustable suction resistance standard bar in the stretched state in Embodiment 1 of this utility model.

[0027] Figure 3 This is a cross-sectional view of the adjustable suction resistance standard rod at point AA in the initial state of Embodiment 1 of this utility model.

[0028] Figure 4 This is a cross-sectional view of point AA of the adjustable suction resistance standard rod in the tensile state in Embodiment 1 of this utility model.

[0029] Figure 5 This is a schematic diagram of the adjustable suction resistance standard bar in Embodiment 2 of this utility model.

[0030] Figure 6 This is a schematic diagram of the adjustable suction resistance standard bar in Embodiment 3 of this utility model.

[0031] In the figure: 1. Standard rod body; 2. Movable sleeve; 3. Flexible tube; 4. Operating ring; 5. Spring; 11. First airflow channel; 12. Gas inlet; 21. Second airflow channel; 22. Gas outlet; 13. Limiting groove; 14. Limiting block. Detailed Implementation

[0032] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0033] Example 1

[0034] like Figures 1-4 As shown, an adjustable suction resistance standard rod includes a standard rod body 1, a movable sleeve 2, and a flexible tube 3. In this embodiment, the flexible tube 3 is made of rubber.

[0035] The standard rod body 1 has a built-in first airflow channel 11 and is provided with a gas inlet / gas outlet. In this embodiment, it is designed as a gas inlet 12, and the diameter of the first airflow channel 11 remains unchanged.

[0036] The movable sleeve 2 has a built-in second airflow channel 21 and is provided with a gas outlet / gas inlet. In this embodiment, it is designed as a gas outlet 22. The diameter of the second airflow channel 21 remains unchanged and is the same as the diameter of the first airflow channel 11.

[0037] The movable sleeve 2 is fitted outside the standard rod body 1 and slides and locks along the axial direction of the standard rod body 1 to achieve overall length adjustment. The sliding stroke length can be controlled as needed, and the locking method is diversified. In this embodiment, friction locking is used. In other embodiments, it can also be locked by means of bolts tightened from the side, or the movable sleeve 2 and the standard rod body 1 can be designed to be connected by threads to change the length.

[0038] One end of the flexible tube 3 is connected to the standard rod body 1, and the other end is connected to the movable sleeve 2. The first airflow channel 11 and the second airflow channel 21 are connected through the flexible tube 3 to form a complete airflow channel. It should be noted that the connection between the flexible tube 3 and the first airflow channel 11 and the second airflow channel 21 is sealed to avoid airflow loss and inaccurate suction resistance measurement.

[0039] In the initial state, the inner diameter of the flexible tube 3 is equal to the inner diameter of the first airflow channel 11 and the second airflow channel 21. In the stretched state, the inner diameter will narrow accordingly, and after reset, it will return to its original state.

[0040] By adjusting the position of the movable sleeve 2, the length of the complete airflow channel and the inner diameter of the flexible tube 3 can be changed to achieve suction resistance adjustment.

[0041] To suit the application scenarios of the suction resistance standard rod, the complete airflow channel formed by the first airflow channel, the second airflow channel, and the flexible tube is a straight airflow channel.

[0042] In other embodiments, to meet different usage requirements, the complete airflow channel formed by the first airflow channel, the second airflow channel, and the flexible tube is an airflow channel with a corner. The corner is usually located inside the standard rod body or inside the movable sleeve, rather than in the flexible tube area.

[0043] In a preferred embodiment, in order to limit the travel range of the movable sleeve 2 and ensure that the operation does not damage the equipment, a limiting groove 13 is provided on the standard rod body 1 corresponding to the movable sleeve to limit the travel of the movable sleeve 2, and a limiting block 14 is provided on the movable sleeve 2 corresponding to the limiting groove.

[0044] For ease of adjustment, the standard bar body is provided with a scale corresponding to the movable sleeve. It should be noted that since the entire process of resistance change may not be linear, the scale setting does not need to follow the averaging principle, but needs to be determined according to the specific measurement of the current resistance standard bar. Each standard bar needs to have a scale that matches its own performance.

[0045] Working principle explanation:

[0046] The suction resistance parameter, as the name suggests, is the numerical value of gas resistance at a specific gas flow rate. When gas flows in a pipe, it is affected by both the pipe diameter and the pipe length. The larger the pipe diameter, the smaller the suction resistance; the shorter the pipe, the smaller the suction resistance. Utilizing this principle, an adjustable standard rod is designed. To ensure the airtightness and adjustability of the airflow channel, a flexible tube is used as the regulating tube. When the extension or retraction action is performed, the length changes, and the diameter of the flexible tube also changes accordingly, resulting in a change in suction resistance. This satisfies the requirement that a single standard rod can be adjusted to multiple suction resistance values, making the standard rod more convenient and flexible to use. Furthermore, since both variables are adjustable, the adjustable range is also larger in the superimposed state, which is more conducive to the expansion of application scenarios.

[0047] Example 2

[0048] like Figure 5 As shown, the main difference between this embodiment and Embodiment 1 is that a spring 5 is implanted in the rubber tube.

[0049] In a structure with spring implantation, when the flexible tube is stretched, the spring naturally elongates, and the flexible tube also narrows uniformly due to local deformation. This makes the change process of the flexible tube more balanced, the restoring force more stable, and the service life extended.

[0050] Example 3

[0051] like Figure 6 As shown, the difference from the previous embodiment is that, in this embodiment, in order to protect the movable sleeve 2 and reasonably realize axial movement, an operating ring 4 is provided on the standard rod body 1 corresponding to the movable area of ​​the movable sleeve 2. The operating ring 4 is threadedly engaged with the outer wall of the movable sleeve 2 and rotates with the standard rod body 1. The movable sleeve 2 is driven to move axially by rotating the operating ring 4. The locking method is the structure of the threaded engagement between the operating ring 4 and the movable sleeve 2, and the rotational resistance assistance between the operating ring 4 and the standard rod body 1.

[0052] In scenarios with springs, the frictional force between the pressure sleeve 4, the movable sleeve 2, and the standard rod body 1 is greater than the self-resetting elastic force of the flexible tube 3 and the spring 5 combined, so as to achieve the self-locking of the movable sleeve.

[0053] 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 adjustable resistance standard bar, characterized in that: Includes the standard rod body, movable sleeve, and flexible tube; The standard rod body has a built-in first airflow channel and is equipped with a gas inlet / gas outlet; The movable sleeve has a built-in second airflow channel and is equipped with a gas outlet / gas inlet; The movable sleeve is fitted onto the outside of the standard rod body and slides and locks along the axial direction of the standard rod body to achieve adjustment of the overall length; One end of the flexible tube is connected to the standard rod body, and the other end is connected to the movable sleeve. The first airflow channel and the second airflow channel are connected through the flexible tube to form a complete airflow channel. By adjusting the position of the movable sleeve, the length of the complete airflow channel and the inner diameter of the flexible tube can be changed to achieve suction resistance adjustment.

2. The adjustable resistance resistance standard rod of claim 1, wherein: The flexible tube is a rubber tube.

3. A standard rod of adjustable resistance according to claim 1 or 2, characterized in that: A spring is embedded in the rubber tube.

4. The adjustable resistance resistance standard rod of claim 1 or 2, wherein: The standard rod body is provided with a limiting groove corresponding to the movable sleeve to limit the movement stroke of the movable sleeve, and the movable sleeve is provided with a limiting block corresponding to the limiting groove.

5. The adjustable resistance resistance standard rod of claim 1, wherein: The complete airflow channel formed by the first airflow channel, the second airflow channel, and the flexible tube is a straight airflow channel.

6. The adjustable resistance resistance standard rod of claim 1, wherein: The complete airflow channel formed by the first airflow channel, the second airflow channel, and the flexible tube is an airflow channel with a bend.

7. The adjustable resistance resistance standard rod of claim 1, wherein: The frictional force between the standard rod body and the movable sleeve is greater than the self-resetting elastic force of the flexible tube, so as to achieve the self-locking of the movable sleeve.

8. The adjustable resistance resistance standard rod of claim 1, wherein: An operating ring is provided on the standard rod body corresponding to the movable area of ​​the movable sleeve. The operating ring is threaded to the outer wall of the movable sleeve and rotates with the standard rod body. The movable sleeve is driven to move axially by rotating the operating ring.

9. The adjustable resistance resistance standard of claim 3, wherein: An operating ring is provided on the standard rod body corresponding to the movable area of ​​the movable sleeve. The operating ring is threaded to the outer wall of the movable sleeve and rotates with the standard rod body. The movable sleeve is driven to move axially by rotating the operating ring.

10. The adjustable resistance resistance standard rod of claim 1, wherein: The standard rod body has graduations corresponding to the movable sleeve.

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