Flow regulator

Abstract

The utility model provides a flow regulator, which relates to the technical field of flow regulators, and comprises a tube shell and a grating profile positioned in the center of the interior of the tube shell, and a first resistance screen and a second resistance screen are symmetrically arranged in the tube shell and positioned at two ends of the grating profile; the first resistance screen and the second resistance screen are the same in structural size. The flow regulator is fixedly assembled by selecting ready-made profiles, so that the flow regulator is convenient to process, light in weight and small in resistance, has two functions of a straightener and the flow regulator, can be used for optimizing and regulating incoming air flow no matter an upstream air flow field is of a rotating type or a non-uniform type, and is high in practicability. And stable and correct flow measurement data can be obtained in a relatively short pipeline space.

Description

Technical Field

[0001] The utility model relates to the technical field of flow regulators, in particular to the regulation of air flow and flow field distribution improvement before and after wind volume measurement equipment. Background Art

[0002] In the field of aerodynamics, air flow measurement is required in many occasions. In engineering applications, throttling components such as nozzles, orifice plates, and venturi tubes are generally used for measurement. When air flows through a specific throttling component, it will produce a certain flow resistance. The factor that has the greatest impact on the flow resistance is the air flow through the throttling component. Therefore, the air flow can be measured by measuring the pressure difference before and after the throttling component.

[0003] For example, GB / T 2624 "Measurement of full pipe fluid flow rate using a differential pressure device installed in a circular cross-section pipeline" uses this principle and recommends three types of flow measurement devices: orifice plate, nozzle, and venturi tube. However, the pressure difference measurement before and after the throttling component is easily affected by the air flow field before and after the component, resulting in measurement errors. For this reason, the standard stipulates that a sufficient length of straight pipe section must be reserved upstream and downstream of the throttling component (for example: when there is a 90° elbow upstream of the orifice plate, a straight pipe section of 6-44 times the pipe diameter length needs to be reserved, depending on the orifice plate aperture ratio). If there is not enough space to accommodate the straight pipe section in the application, the standard allows the use of a flow conditioner device to minimize the length of the pipeline;

[0004] For another example, GB / T2624 recommends two types of flow regulator devices, flow straighteners and flow regulators. Users select them according to the flow characteristics of the air upstream of the throttling component. If the upstream air has a rotating flow characteristic in the circumferential direction (for example, the outlet flow state of an axial flow fan without guide vanes installed), a flow straightener is required to eliminate the rotational speed of the air. If the upstream air has uneven and asymmetric axial velocity characteristics, such as valves, elbows, sudden changes in pipe diameter, etc., a flow regulator is required to evenly distribute the airflow velocity along the entire pipe cross section.

[0005] Furthermore, Appendix C of GB / T 2624.1 recommends three types of flow straighteners, namely, tube bundle flow straightener, AMCA straightener, and Etoile straightener, and five types of flow regulators, namely, Gallagher, K-Lab NOVL, NEL (Spearman), Sprenkle, and Zanker. The main function of the three recommended flow straighteners is to eliminate or significantly reduce vortices, but they are not ideal in terms of uniformly distributing the axial airflow velocity.

[0006] The five flow conditioners recommended above not only have sufficient vortex elimination capabilities, but also have significant uniform distribution of airflow velocity capabilities. However, these flow conditioners have the disadvantages of being complex to manufacture and inconvenient to install. In addition, the drag coefficient of the Zanker flow conditioner is more than 5, which is likely to cause additional energy loss.

[0007] To this end, the utility model provides a flow regulator. Summary of the invention

[0008] In view of the deficiencies of the prior art, the utility model provides a flow regulator to solve the problems raised by the above-mentioned background technology.

[0009] In order to achieve the above objectives, the present invention is implemented through the following technical solutions: 1

[0010] A flow regulator comprises a tube shell (1) and a grid profile (3) located at the center of the tube shell (1); a first resistance screen (2) and a second resistance screen (4) are symmetrically arranged at both ends of the grid profile (3) inside the tube shell (1); the first resistance screen (2) and the second resistance screen (4) have the same structural dimensions;

[0011] The grid profile (3) is a honeycomb hexagonal grid, and the axial length of the grid profile (3) is 2.5-3.5 times the grid plate spacing;

[0012] The first resistance screen (2) and the second resistance screen (4) are woven screens or steel plate screens, and the first resistance screen (2) and the second resistance screen (4) are fixedly connected to the tube shell (1).

[0013] Furthermore, the diameter of the tube shell (1) is the same as the diameter of the upstream connecting pipe.

[0014] Furthermore, the resistance of the first resistance screen (2) and the second resistance screen (4) can be adjusted by changing the perforation rates of the first resistance screen (2) and the second resistance screen (4).

[0015] Furthermore, the grille profile (3) can also be a "well"-shaped egg-crate grille, and the axial length of the grille profile 3 is 2.5-3.5 times the grid plate spacing.

[0016] Furthermore, the first resistance screen (2) and the second resistance screen (4) are fixed to the tube shell (1) by welding.

[0017] Furthermore, the grid profile (3) and the tube shell (1) are fixed by welding.

[0018] Furthermore, the grille profile (3) is made of stainless steel or aluminum alloy.

[0019] Furthermore, the tube shell (1) is made of metal.

[0020] The utility model provides a flow regulator, which has the following beneficial effects compared with the prior art:

[0021] The flow regulator of the present invention is fixedly assembled by selecting ready-made profiles. It is not only easy to process, but also light in weight and small in resistance. Secondly, it has the two functions of a straightener and a flow regulator. No matter whether the upstream air flow field is a rotating type or an uneven type, it can be used to optimize and adjust the air flow to ensure stable and correct flow measurement data in a shorter pipeline space. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a structural schematic diagram of a flow regulator;

[0023] Figure 2 is a cross-sectional view of a flow conditioner;

[0024] Figure 3 A schematic diagram of an exploded view of a flow conditioner.

[0025] In the figure: 1. tube shell; 2. first resistance screen; 3. grille profile; 4. second resistance screen. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-3 The utility model provides a technical solution for a flow regulator: a flow regulator, comprising a tube shell 1 and a grid profile 3 located at the center of the tube shell 1, the diameter of the tube shell 1 is the same as the diameter of the upstream connecting pipe, which is convenient for connecting with the upstream connecting pipe, and the tube shell 1 is made of metal.

[0028] The interior of the tube shell 1 is symmetrically provided with a first resistance screen 2 and a second resistance screen 4 at both ends of the grille profile 3. The first resistance screen 2 and the second resistance screen 4 have the same structural dimensions. The first resistance screen 2 and the second resistance screen 4 are made of ready-made woven meshes or steel plate meshes. It should be added that the first resistance screen 2 and the second resistance screen 4 can also use other types of mesh plates, such as perforated plates, etc. The first resistance screen 2 and the second resistance screen 4 are fixed to the tube shell 1 by but not limited to welding. Since the first resistance screen 2 and the second resistance screen 4 must ensure sufficient resistance to force the incoming air to flow evenly, the resistance of the first resistance screen 2 and the second resistance screen 4 can be adjusted by changing the perforation rate of the first resistance screen 2 and the second resistance screen 4.

[0029] The grille profile 3 is made of ready-made stainless steel or aluminum alloy, and the grille profile 3 is a honeycomb hexagonal grille (i.e., a hexagonal grille profile drawn from stainless steel or aluminum alloy on site). In addition, the grille profile 3 can also use a ready-made "well"-shaped egg-crate grille, and the axial length (i.e., thickness) of the grille profile 3 is 2.5-3.5 times the grid plate spacing. It should be added that the grille profile 3 and the tube shell 1 are also fixedly connected by but not limited to other connection methods, and welding is preferred.

[0030] The working principle of the utility model is as follows: when installing the flow regulator of the present design, the grid profile 3 is fixed to the inner center of the tube shell 1 by welding, and then the first resistance screen 2 and the second resistance screen 4 with corresponding perforation rate are selected according to the demand, and the first resistance screen 2 and the second resistance screen 4 are welded and fixed to the inner part of the tube shell 1 and located at the two ends of the grid profile 3, thereby completing the installation of the flow regulator;

[0031] Furthermore, the tube shell 1 is connected and fixed to the upstream connecting pipe to facilitate the use of the flow regulator. The present design adopts ready-made profiles, which are not only easy to process, but also light in weight and low in resistance. Its resistance coefficient is below 3.5, and it has both straighteners and flow regulators. Regardless of whether the upstream air flow field is rotating or uneven, it can be used to optimize and adjust the air flow.

[0032] The above is only a preferred implementation of the present invention. It should be noted that, for ordinary technicians in the technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the field unless otherwise specified and limited.

[0033] The above contents are further detailed descriptions of the present invention in combination with specific implementation methods, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A flow regulator, characterized in that: It comprises a tube shell (1) and a grille profile (3) located at the center of the tube shell (1), wherein a first resistance screen (2) and a second resistance screen (4) are symmetrically arranged at both ends of the grille profile (3) inside the tube shell (1), and the first resistance screen (2) and the second resistance screen (4) have the same structural dimensions; The grid profile (3) is a honeycomb hexagonal grid, and the axial length of the grid profile (3) is 2.5-3.5 times the grid plate spacing; The first resistance screen (2) and the second resistance screen (4) are woven screens or steel plate screens, and the first resistance screen (2) and the second resistance screen (4) are fixedly connected to the tube shell (1).

2. A flow regulator according to claim 1, characterized in that: The diameter of the tube shell (1) is the same as the diameter of the upstream connecting pipeline.

3. A flow regulator according to claim 1, characterized in that: The resistance of the first resistance screen (2) and the second resistance screen (4) can be adjusted by changing the perforation rates of the first resistance screen (2) and the second resistance screen (4).

4. A flow regulator according to claim 1, characterized in that: The grille profile (3) can also be a "well"-shaped egg-crate grille, and the axial length of the grille profile (3) is 2.5-3.5 times the grid plate spacing.

5. A flow regulator according to claim 1, characterized in that: The first resistance screen (2) and the second resistance screen (4) are fixed to the tube shell (1) by welding.

6. A flow regulator according to claim 1, characterized in that: The grid profile (3) and the tube shell (1) are fixed by welding.

7. A flow regulator according to any one of claims 1 to 6, characterized in that: The grille profile (3) is made of stainless steel or aluminum alloy.

8. A flow regulator according to claim 7, characterized in that: The tube shell (1) is made of metal.

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