Filter screen type adjustable resistance standard rod

Abstract

This invention provides a filter-type adjustable suction resistance standard bar, comprising a capillary segment and a filter segment; the capillary segment is provided with capillary pores extending axially, and at least one end of the capillary segment is provided with a structure for mounting the filter; the filter segment includes a plurality of filter assemblies that are stacked and detachably mounted at one or both ends of the capillary segment; the suction resistance is changed by increasing or decreasing the number of filter assemblies. This filter-type adjustable suction resistance standard bar changes the suction resistance value of the standard bar by increasing or decreasing the number of filter assemblies.

Description

Technical Field

[0001] This utility model relates to the field of standardization technology, specifically to a filter-type adjustable suction resistance standard bar. Background Technology

[0002] A suction resistance standard bar is a standard part used to calibrate and standardize suction resistance testing equipment. Currently, suction resistance standard bars are made by stretching quartz glass rods, forming an array of capillary pores inside the quartz glass rods to create airflow resistance. Due to the high difficulty of this manufacturing process, the resistance value of the formed suction resistance standard bar is poorly controllable, and the forming cost is extremely high.

[0003] Suction resistance standard bars usually need to be used in groups, using a combination of suction resistance standard bars with different nominal values ​​to calibrate the suction resistance testing equipment. However, the quartz glass material is fragile, which keeps the cost high.

[0004] Based on the above premise, it is necessary to design a new suction resistance standard rod to reduce the cost of the suction resistance standard rod by using the variable suction resistance characteristic. We know that different resistance values ​​can be formed by increasing or decreasing the gas resistance, but how to combine this concept with the suction resistance standard rod to construct a simple and easy-to-use adjustable suction resistance standard rod is a technical problem that urgently needs to be solved.

[0005] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a filter-type adjustable suction resistance standard bar that changes the suction resistance value by increasing or decreasing the number of filter screens.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: a filter-type adjustable suction resistance standard rod, comprising a capillary section and a filter section;

[0008] The capillary segment is provided with capillary pores extending in the axial direction, and at least one end of the capillary segment is provided with a structure for installing a filter screen.

[0009] The filter segment includes several filter assemblies that are stacked and detachably installed at one or both ends of the capillary segment; the suction resistance is changed by increasing or decreasing the number of filter assemblies.

[0010] Based on the above, the capillary segment includes a housing and a capillary mandrel placed inside the housing, wherein an array of axially penetrating capillaries is arranged in the capillary mandrel.

[0011] Based on the above, one or both ends of the housing are provided with mounting steps, and the filter assembly is mounted on the mounting steps via a quick-release structure.

[0012] Based on the above, each filter assembly includes an annular filter frame and a filter, wherein the filter frame has a T-shaped structure and the filter frames are stacked.

[0013] Based on the above, the mounting step of the outer shell or the T-shaped step of the filter frame is provided with threads, grooves or bosses, and the corresponding side of the filter frame is provided with threads, clips or latches that cooperate with them.

[0014] Based on the above, the mesh count of the filter screens in each of the filter screen assemblies may be the same or different.

[0015] Based on the above, the lengths of the filter segments at both ends of the capillary segment are always equal.

[0016] Based on the above, the suction resistance of the filter segment at one end of the capillary segment is less than the suction resistance of the filter segment at the other end.

[0017] Based on the above, the filter assembly has at least three different mesh sizes.

[0018] As described above, sealing rings are provided between adjacent filter assemblies and between filter assemblies and capillary segments.

[0019] This utility model has substantial features and progress compared to the prior art. Specifically, this utility model is based on the traditional capillary type suction resistance standard rod. By adding or removing a certain number of filter screens at both ends of a basic capillary, the overall suction resistance value of the standard rod can be changed, thereby achieving adjustable suction resistance value.

[0020] Furthermore, it has another advantage: airflow components usually require filtration due to the presence of many impurities. Therefore, traditional solutions often design a dedicated filtration step to ensure the cleanliness of the airflow. However, in the standard rod structure of this solution, the filtration requirements for air can be appropriately reduced. The filtration is accomplished by utilizing the multi-layer filter structure at both ends, thereby avoiding damage to the capillary suction standard rod in the middle. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the filter-type adjustable suction resistance standard bar in this utility model.

[0022] Figure 2 This is a cross-sectional view of AA, BB-, and CC in this utility model.

[0023] In the diagram: 1. Capillary section; 2. Filter screen section; 11. Capillary pore; 12. Outer shell; 13. Capillary mandrel; 14. Mounting step; 21. Filter screen frame; 22. Filter screen. Detailed Implementation

[0024] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0025] like Figure 1 and Figure 2 As shown, a filter-type adjustable suction resistance standard bar includes a capillary section 1 and a filter section 2.

[0026] The capillary segment 1 is provided with capillary pores 11 extending along the axial direction. At least one end of the capillary segment is provided with a structure for installing a filter screen. In this embodiment, the structure of the capillary segment 1 includes a housing 12 and a capillary mandrel 13. The capillary mandrel is provided with an array of axially penetrating capillaries. The capillary mandrel 13 is installed inside the housing 12. The capillary mandrel 13 is a quartz glass tube with built-in capillary pores.

[0027] The filter segment 2 includes several filter assemblies that are stacked and detachably installed at one or both ends of the capillary segment 1; the suction resistance is changed by increasing or decreasing the number of filter assemblies.

[0028] Specifically, one or both ends of the housing 12 are provided with mounting steps 14, and the filter assembly is mounted on the mounting steps 14 via a quick-release structure.

[0029] Each filter assembly includes an annular filter frame 21 and a filter 22. The filter frame 21 has a T-shaped structure, and the filter frames 21 are stacked. Specifically, in this embodiment, the mounting step of the outer shell or the T-shaped step of the filter frame is provided with threads, slots or bosses, and the corresponding side of the filter frame is provided with threads, clips or latches that cooperate with it.

[0030] Generally speaking, due to sealing considerations, threaded connections are relatively easier to use and maintain sealing performance.

[0031] In other embodiments, the mesh counts of the filter screens in each filter screen assembly may be the same or different. For example, the filter screen assembly may have at least three different mesh count specifications. Through different combinations, more suction resistance can be formed.

[0032] Sealing rings are provided between adjacent filter screen assemblies and between filter screen assemblies and capillary sections.

[0033] In another embodiment, the lengths of the filter segments at both ends of the capillary segment are always equal to ensure structural balance, but this is not absolute.

[0034] In other embodiments, the suction resistance of the filter segment at one end of the capillary segment is less than that at the other end, so as to construct a standard bar with a progressive suction resistance.

[0035] Working principle explanation:

[0036] Because of its fine mesh structure, the filter screen creates suction resistance during ventilation. Multiple filters stacked on top of each other divide the airflow multiple times, resulting in a cumulative suction resistance effect, which constitutes the basic principle of suction resistance adjustment.

[0037] The capillary tube section installed in the middle serves two purposes: firstly, to provide a mounting base for the filter assembly, and secondly, to constrain the airflow and keep it within a certain range.

[0038] When using it, the suction resistance can be controlled by increasing or decreasing the number of filters at one or both ends.

[0039] To facilitate adjustment, the increase or decrease in suction resistance value can be marked on each filter screen, similar to the nature of weights, based on the mesh size of the filter screen and the actual measured suction resistance contribution.

[0040] 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 filter screen adjustable resistance standard rod, characterized in that: Includes capillary segments and filter segments; The capillary segment is provided with capillary pores extending in the axial direction, and at least one end of the capillary segment is provided with a structure for installing a filter screen. The filter segment includes several filter assemblies that are stacked and detachably installed at one or both ends of the capillary segment; the suction resistance is changed by increasing or decreasing the number of filter assemblies.

2. The screen-style regulated resistance standard rod of claim 1, wherein: The capillary segment includes a housing and a capillary mandrel placed inside the housing, wherein an array of axially penetrating capillaries is arranged in the capillary mandrel.

3. The screen-style regulated resistance standard rod of claim 1, wherein: One or both ends of the housing are provided with mounting steps, and the filter assembly is mounted on the mounting steps via a quick-release structure.

4. The screen-style regulated resistance standard rod of claim 3, wherein: Each filter assembly includes an annular filter frame and a filter screen. The filter frame has a T-shaped structure, and the filter frames are stacked together.

5. The screen-style regulated resistance standard rod of claim 4, wherein: The mounting step of the outer shell or the T-shaped step of the filter frame is provided with threads, grooves or bosses, and the corresponding side of the filter frame is provided with threads, clips or latches that cooperate with them.

6. The screen-based regulated resistance standard rod of any one of claims 1-5, wherein: The mesh counts of the filter elements in each of the filter assemblies may be the same or different.

7. The filter-type adjustable suction resistance standard rod according to any one of claims 1-5, characterized in that: The lengths of the filter segments at both ends of the capillary segment are always equal.

8. The screen-based regulated resistance standard rod of any one of claims 1-5, wherein: The suction resistance of the filter segment at one end of the capillary segment is less than that at the other end.

9. The screen-based regulated resistance standard rod of any one of claims 1-5, wherein: The filter assembly has at least three different mesh sizes.

10. The screen-based regulated resistance standard rod of any one of claims 1-5, wherein: Sealing rings are provided between adjacent filter screen assemblies and between filter screen assemblies and capillary sections.

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