Elbow device with highly uniform outlet flow field

Abstract

The invention relates to the technical field of elbows, in particular to an elbow device with a highly uniform outlet flow field, and aims to solve the problems that a conventional elbow outlet is not high in uniformity, and the space is limited due to the fact that the length requirement of a straight pipe section needs to be met during flow measurement and test of a test piece. The inner side flow guide plate and the outer side flow guide plate are sequentially fixed in the elbow in the direction from the inner arc to the outer arc of the elbow, the inner rectification section and the outer rectification section are both in a circular ring shape, the outlet end of the elbow is connected with the outer rectification section, the inner rectification section is arranged in the outer rectification section, the inner rectification section is connected with the outer rectification section through a plurality of flow equalizing partition plates, and air flow is even after an outlet. Compared with a conventional elbow, 90% of straight pipe section installation requirements can be reduced. In engineering and scientific research activities, the device can be applied to space-limited places such as flow and pneumatic test piece performance tests, and adverse effects caused by uneven incoming flow can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of elbows, and in particular to an elbow device with a highly uniform outlet flow field. Background Art

[0002] In engineering and scientific research activities, flow meters are needed to test flow or conduct pneumatic performance tests on test pieces. Both require the incoming flow to have a certain degree of uniformity, that is, clear straight pipe section requirements. If the on-site installation space is limited and cannot meet the straight pipe section requirements, it is necessary to select another site or endure the deviation of measurement accuracy, test piece pneumatic and other performance test results.

[0003] In summary, the uniformity of conventional elbow outlets is not high, and when measuring flow and testing test pieces, there is the problem of limited space to meet the straight pipe section length requirements.

[0004] The present invention arranges a guide plate in the elbow before the inlet flow of the flow meter and the test piece, and adds a rectifying section after the elbow, so that the uniformity after the elbow is greatly improved, and the uniformity required by the traditional straight pipe section is achieved within a short distance. It has the characteristics of uniform outlet flow field and low total pressure loss. The flow rate and the test piece can be tested under space-constrained conditions to avoid deviation of accuracy and test results. Summary of the invention

[0005] The purpose of the patent of this invention: The content of this invention is to solve the problem that the outlet uniformity of conventional elbows is not high, and the space is limited when meeting the straight pipe section length requirement during flow measurement and test piece testing. The present invention provides an elbow device with a highly uniform outlet flow field.

[0006] The object of the present invention is achieved as follows: an elbow device with a highly uniform outlet flow field, comprising an elbow, an inner guide plate, an outer guide plate, an inner straightening section, an outer straightening section and a plurality of flow-averaging baffles;

[0007] The inner guide plate and the outer guide plate are both arc-shaped curved plates, which are fixed in the elbow in sequence along the inner arc to the outer arc direction of the elbow, the inner straightening section and the outer straightening section are both annular, the outlet end of the elbow is connected to the outer straightening section, the inner straightening section is arranged in the outer straightening section, and the inner straightening section is connected to the outer straightening section through a plurality of flow equalizing partitions.

[0008] Furthermore, the inner diameters of the elbow and the outer straightening section are the same, the inner diameter of the outer straightening section is D, the center arc distance from the outer guide plate to the elbow is r1, and the center arc distance from the inner guide plate to the elbow is r2, r1 / D=0.1∽0.4, r2 / D=0.1∽0.4.

[0009] Furthermore, the length of the outer rectifying section is h, h / D=0.1∽0.5.

[0010] Furthermore, the inner diameter of the inner rectifying section is d, d / D=0.1∽0.9.

[0011] Furthermore, the number of the flow-sharing baffles is 3 to 12.

[0012] Furthermore, the inner guide plate, the outer guide plate and the outer rectifying section are all welded to the elbow.

[0013] Furthermore, the inner rectifying section and the outer rectifying section are both connected to the current balancing partition by welding.

[0014] Furthermore, the inner rectifying section and the outer rectifying section are concentrically arranged.

[0015] Beneficial effects:

[0016] In a certain structure of the present invention, the air flow uniformity at 1.5D after the outlet is equivalent to or even slightly stronger than that at 22D of a conventional elbow; compared with a conventional elbow, the total pressure loss is 30% lower; flow measurement and test pieces in confined spaces can also ensure test accuracy and results, and are beneficial to energy saving.

[0017] The main feature of the present invention is that the airflow after the outlet is uniform, which can reduce the straight pipe section installation requirements by 90% compared with conventional elbows. In engineering and scientific research activities, it can be used in space-constrained places such as flow and pneumatic test piece performance testing, and can avoid the adverse effects caused by uneven incoming flow.

[0018] The present invention arranges a guide plate in the elbow before the inlet flow of the flow meter and the test piece, and adds a rectifying section after the elbow, so that the uniformity after the elbow is greatly improved, and the uniformity required by the traditional straight pipe section is achieved within a short distance. It has the characteristics of uniform outlet flow field and low total pressure loss. The flow rate and the test piece can be tested under space-constrained conditions to avoid deviation of accuracy and test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of an elbow device with a highly uniform outlet flow field of the present invention;

[0020] Figure 2 It is a side view at the outer fairing section;

[0021] Figure 3 It is a three-dimensional schematic diagram of an invented elbow device with a highly uniform outlet flow field.

[0022] Figure 4 is a schematic diagram of an elbow device with six flow-sharing baffles;

[0023] Figure 5 yes Figure 4 A side view of the outer fairing section;

[0024] Figure 6It is a schematic diagram of the elbow device of eight flow-sharing baffles;

[0025] Figure 7 yes Figure 4 Side view of the outer fairing section.

[0026] In the figure: 1. elbow; 2. inner guide plate; 3. outer guide plate; 4. inner rectifying section; 5. outer rectifying section; 6. flow equalizing baffle. DETAILED DESCRIPTION

[0027] Specific implementation method 1: An elbow device with a highly uniform outlet flow field, which includes an elbow 1, an inner guide plate 2, an outer guide plate 3, an inner straightening section 4, an outer straightening section 5 and a plurality of flow-averaging baffles 6;

[0028] The inner guide plate 2 and the outer guide plate 3 are both arc-shaped curved plates. The inner guide plate 2 and the outer guide plate 3 are sequentially fixed in the elbow 1 along the inner arc to the outer arc direction of the elbow 1. The inner straightening section 4 and the outer straightening section 5 are both annular. The outlet end of the elbow 1 is connected to the outer straightening section 5. The inner straightening section 4 is arranged in the outer straightening section 5, and the inner straightening section 4 is connected to the outer straightening section 5 through a plurality of flow equalizing partitions 6.

[0029] In this embodiment: the end of the elbow that is not connected to the external rectifying section is the inlet end, an inner guide plate and an outer guide plate are arranged inside the elbow to guide the incoming air, a guide plate is arranged inside the elbow in front of the inlet flow, and an inner rectifying section and an outer rectifying section are added after the elbow to greatly improve the uniformity after the elbow, and the uniformity required by the traditional straight pipe section is achieved within a short distance.

[0030] Specific implementation method 2: An elbow device with a highly uniform outlet flow field, the inner diameters of the elbow 1 and the outer straightening section 5 are the same, the inner diameter of the outer straightening section 5 is D, the center arc distance from the outer guide plate 3 to the elbow 1 is r1, and the center arc distance from the inner guide plate 2 to the elbow 1 is r2, r1 / D=0.1∽0.4, r2 / D=0.1∽0.4.

[0031] Other implementations are the same as the first specific implementation.

[0032] Specific implementation method three: An elbow device with a highly uniform outlet flow field, the length of the outer rectifying section 5 is h, h / D=0.1∽0.5.

[0033] Other implementations are the same as the first specific implementation.

[0034] Specific implementation method 4: An elbow device with a highly uniform outlet flow field, the inner diameter of the inner rectifying section 4 is d, d / D=0.1∽0.9.

[0035] Other implementations are the same as the first specific implementation.

[0036] Specific implementation method 5: An elbow device with a highly uniform outlet flow field, the number of flow-averaging baffles 6 is 3 to 12.

[0037] In this embodiment, the number of the flow-balancing baffles 6 is 3 to 12, and the multiple baffles are evenly distributed along the circumferential direction, which can ensure the supporting strength of the outer rectifying section and the outer rectifying section.

[0038] Other implementations are the same as the first specific implementation.

[0039] Specific implementation method six: An elbow device with a highly uniform outlet flow field, wherein the inner guide plate 2 , the outer guide plate 3 and the outer rectifying section 5 are all welded to the elbow 1 .

[0040] In this embodiment, the inner guide plate, the outer guide plate and the outer rectifying section are all welded to the elbow, so the connection is relatively stable and has a long service life.

[0041] Other implementations are the same as the first specific implementation.

[0042] Specific implementation method seven: An elbow device with a highly uniform outlet flow field, wherein the inner rectifying section 4 and the outer rectifying section 5 are both welded to the flow balancing baffle 6 .

[0043] In this embodiment, the inner rectifying section and the outer rectifying section are both connected to the current balancing baffle by welding, and the connection is relatively stable and has a long service life.

[0044] Other implementations are the same as the first specific implementation.

[0045] Specific implementation method eight: An elbow device with a highly uniform outlet flow field, wherein the inner rectifying section 4 and the outer rectifying section 5 are concentrically arranged.

[0046] Other implementations are the same as the first specific implementation.

[0047] Working principle:

[0048] A guide plate is set in the elbow before the inlet flow of the flow meter and the test piece, and a rectifying section is added after the elbow, which greatly improves the uniformity after the elbow and achieves the uniformity required by the traditional straight pipe section within a short distance. It has the characteristics of uniform outlet flow field and low total pressure loss. It can be used to test the flow and test pieces under space-constrained conditions to avoid deviation in accuracy and test results.

Claims

1. An elbow device with a highly uniform outlet flow field, characterized in that: It comprises an elbow (1), an inner flow guide plate (2), an outer flow guide plate (3), an inner flow straightening section (4), an outer flow straightening section (5) and a plurality of flow equalizing baffles (6); The inner flow guide plate (2) and the outer flow guide plate (3) are both arc-shaped curved plates. The inner flow guide plate (2) and the outer flow guide plate (3) are fixed in sequence inside the elbow (1) along the direction from the inner arc to the outer arc of the elbow (1). The inner flow rectifying section (4) and the outer flow rectifying section (5) are both annular. The outlet end of the elbow (1) is connected to the outer flow rectifying section (5). The inner flow rectifying section (4) is arranged inside the outer flow rectifying section (5). The inner flow rectifying section (4) is connected to the outer flow rectifying section (5) via a plurality of flow balancing partitions (6).

2. The elbow device with a highly uniform outlet flow field according to claim 1, characterized in that: The inner diameters of the elbow (1) and the outer rectifying section (5) are the same, the inner diameter of the outer rectifying section (5) is D, the center arc distance from the outer guide plate (3) to the elbow (1) is r1, the center arc distance from the inner guide plate (2) to the elbow (1) is r2, r1 / D=0.1∽0.4, r2 / D=0.1∽0.

4.

3. The elbow device with a highly uniform outlet flow field according to claim 1, characterized in that: The length of the external rectifying section (5) is h, where h / D=0.1-0.

5.

4. The elbow device with a highly uniform outlet flow field according to claim 1, characterized in that: The inner diameter of the inner rectifying section (4) is d, d / D=0.1∽0.

9.

5. The elbow device with a highly uniform outlet flow field according to claim 1, characterized in that: The number of the flow-sharing baffles (6) is 3 to 12.

6. The elbow device with a highly uniform outlet flow field according to claim 1, characterized in that: The inner guide plate (2), the outer guide plate (3) and the outer rectifying section (5) are all welded to the elbow (1).

7. The elbow device with a highly uniform outlet flow field according to claim 1, characterized in that: The inner rectifying section (4) and the outer rectifying section (5) are both connected to the flow equalizing partition plate (6) by welding.

8. The elbow device with a highly uniform outlet flow field according to claim 1, characterized in that: The inner rectifying section (4) and the outer rectifying section (5) are arranged concentrically.

Images