Gas-gas static mixer with small length-diameter ratio and large flow rate

Abstract

This utility model relates to a gas-gas static mixer with a small length-to-diameter ratio and large flow rate, belonging to the technical field of high-altitude simulation test benches for aero-engines. It solves the problem of uneven airflow mixing encountered in the temperature regulation process of existing high-altitude test benches for engines. This utility model includes a mixing pipe, mounting rings, mounting brackets, and mixing plates. The mounting rings are disposed at both ends of the mixing pipe. The mounting brackets are fixedly disposed inside the mixing pipe by the mounting rings, and multiple mounting brackets are arranged in parallel and spaced apart. The mixing plates are evenly disposed inside the mixing pipe by multiple mounting brackets, each extending from one end of the mixing pipe to the other. The mixing plates include staggered first and second mixing plates with opposite inclination directions. This utility model uses multiple staggered mixing plates with different inclination directions to achieve efficient airflow mixing while reducing pressure loss.

Description

Technical Field

[0001] This utility model relates to the technical field of high-altitude simulation test benches for aero-engines, and in particular to a gas-gas static mixer with a small length-to-diameter ratio and large flow rate pipe. Background Technology

[0002] High-altitude test facilities have stringent requirements for the uniformity of engine inlet temperature. Therefore, a static mixer is needed at the T-junction where high and low temperature airflows mix to enhance the mixing effect. However, high-altitude test facility mixers have high requirements for pressure loss and dimensions. For civil aviation engine high-altitude test facilities with flow rate requirements in the hundreds or even thousands of kilograms per second, excessive pressure loss means high costs for the air supply fan and operation. At the same time, due to flow velocity limitations, the pipe diameter is often on the order of a few meters, so the mixer cannot have a large length-to-diameter ratio to meet site requirements.

[0003] Commonly used static mixers in industry, such as the SV, SK, and SX types, have excessive pressure loss and length-to-diameter ratios, making them unsuitable for high-altitude work platforms. Furthermore, pipeline mixers are mostly fixed, integrated designs, and their significant weight leads to difficulties in installation and maintenance, resulting in high maintenance costs.

[0004] Specifically, existing industrial mixers have the following shortcomings:

[0005] 1. Large pressure loss: During the airflow mixing process, the existing mixer configuration will result in a large pressure loss, which not only reduces the energy efficiency of the system, but may also affect the performance of the work platform.

[0006] 2. Excessive length-to-diameter ratio: In the specific application scenarios of aerial work platforms, the existing mixers have an excessively large length-to-diameter ratio, which limits their applicability in compact spaces and also increases the complexity of manufacturing and installation.

[0007] 3. Difficulty in disassembly and maintenance: The design of existing mixers makes them difficult to disassemble and maintain in practical applications, which not only increases maintenance costs but may also lead to work interruptions and affect work efficiency. Utility Model Content

[0008] Based on the above analysis, the present invention aims to provide a gas-gas static mixer with a small aspect ratio and large flow rate to solve the problem of uneven airflow mixing encountered by engine high-altitude test benches during temperature regulation.

[0009] On one hand, this utility model provides a gas-gas static mixer for a small length-to-diameter ratio, high flow rate pipeline, including a mixing pipe, mounting rings, mounting brackets, and mixing plates; wherein, there are two mounting rings, respectively disposed at both ends of the mixing pipe; there are multiple mounting brackets, all fixedly disposed within the mixing pipe by the mounting rings, and the multiple mounting brackets are arranged in parallel and spaced apart; there are multiple mixing plates, evenly disposed within the mixing pipe by the multiple mounting brackets, each mixing plate extending from one end of the mixing pipe to the other end, and each mixing plate being inclined relative to the axial direction of the mixing pipe; the mixing plates include staggered first mixing plates and second mixing plates, with the first mixing plates inclined along a first direction and the second mixing plates inclined along a second direction, the first direction and the second direction being symmetrical about the axial direction of the mixing pipe.

[0010] Furthermore, the mounting bracket includes two side mounting brackets and multiple intermediate mounting brackets.

[0011] Furthermore, each of the intermediate mounting brackets includes multiple first axial support rods and two first end face support rods; the multiple first axial support rods are arranged in parallel at intervals, and the first end face support rods are respectively fixedly connected to both ends of the multiple first axial support rods.

[0012] Furthermore, the side mounting bracket includes multiple second axial support rods, two second end face support rods, and two arc-shaped support rods; the multiple second axial support rods are arranged in parallel at intervals, and the second end face support rods are respectively fixedly connected to both ends of the multiple second axial support rods; the two ends of each arc-shaped support rod are respectively fixedly connected to the two ends of one second end face support rod; the diameter of the arc-shaped support rod is equal to the inner diameter of the mixing pipe.

[0013] Furthermore, multiple inclined grooves are provided on both sides of each of the first end face support rods, the second end face support rods, and the inner side of each arc-shaped support rod, and the two side edges of the mixing plate are engaged in the inclined grooves.

[0014] Furthermore, the inner diameter of the mounting retaining ring is smaller than the inner diameter of the mixing pipe, and two arc-shaped side mounting bracket positioning grooves are symmetrically arranged on the inner circumferential surface of the mounting retaining ring for fixing the arc-shaped support rod.

[0015] Furthermore, the mixing plate located in the middle of the mixing tube is a rectangular plate, and a first clearance groove is provided in the middle of the two side edges of the mixing plate; the edge of the mixing plate located on the side of the mixing tube that abuts against the mixing tube is arc-shaped and closely fits the inner wall of the mixing tube, and a second clearance groove is provided in the middle of the other side edge.

[0016] Furthermore, the angle between the first direction and the second direction and the axis of the mixing tube ranges from 15° to 30°.

[0017] Furthermore, the width of the mixing plate is 1 / 10 of the inner diameter of the mixing tube; the spacing between the mixing plates arranged along the same mounting bracket is 1 / 10 of the inner diameter of the mixing tube.

[0018] Furthermore, a flange is provided at the end of the mixing pipe, and a through hole is provided on the flange.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0020] (1) The gas-gas static mixer of the small length-to-diameter ratio high flow rate pipeline of this utility model uses multiple inclined mixing plates to divide the airflow into multiple small branches at the mixing pipe inlet. Each small branch changes its flow direction and forms a vortex after passing through the mixing plate, which can achieve efficient airflow mixing. Since each mixing plate extends from one end of the mixing pipe to the other end, each small branch only needs to change its flow direction once, which can reduce pressure loss and optimize the length-to-diameter ratio to adapt to the compact space requirements of the aerial work platform. At the same time, the mixing plate is fixed by the mounting bracket, and the mounting bracket is fixed by the mounting retaining ring, which simplifies the disassembly and maintenance process and improves the overall system efficiency and reliability.

[0021] (2) The mixer of this invention has a small length-to-diameter ratio, making it particularly suitable for installation sites with limited space. This feature allows the invention to flexibly adapt to different industrial environments and site conditions, and has broad application prospects.

[0022] (3) The hybrid plate design of this utility model allows it to be placed directly inside the mounting frame, and the mounting frame can be fixed by the mounting retaining ring. This design simplifies the disassembly, assembly, and maintenance process. At the same time, this structure can effectively prevent damage to the plate caused by thermal stress due to temperature changes, thus extending the service life of the equipment.

[0023] (4) This utility model allows multiple mixers to be stacked by setting a flange at the end of the mixing pipe and setting a through hole on the flange. By staggering the installation of adjacent mixers, the fluid is cut and merged from different directions, further enhancing the mixing effect of the fluid. This modular design not only improves the mixing efficiency, but also increases the flexibility and scalability of the system.

[0024] In summary, this invention demonstrates significant advantages in reducing pressure loss, improving mixing effect, adapting to different installation sites, simplifying maintenance procedures, and enhancing modular installation, providing a new solution for the design and application of high-altitude mixers.

[0025] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the description and accompanying drawings, which are particularly pointed out. Attached Figure Description

[0026] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0027] Figure 1 This is a schematic diagram of the overall structure of the gas-gas static mixer of the small length-to-diameter ratio, high flow rate pipeline of this utility model.

[0028] Figure 2 This is a schematic diagram of the internal structure of the gas-gas static mixer of the small length-to-diameter ratio, high flow rate pipeline of this utility model.

[0029] Figure 3 This is a side view of the mixing component of the gas-gas static mixer with a small aspect ratio and large flow rate of the present invention (with the mixing pipe removed);

[0030] Figure 4 This is a schematic diagram of the side mounting bracket of the gas-gas static mixer for a small aspect ratio, high flow rate pipeline according to this utility model.

[0031] Figure 5 This is a schematic diagram of the mixing plate located in the middle of the gas-gas static mixer of the small length-to-diameter ratio, large flow rate pipeline of this utility model.

[0032] Figure 6 This is a schematic diagram of the mounting retaining ring of the gas-gas static mixer for a small length-to-diameter ratio, high flow rate pipeline according to this utility model.

[0033] Figure label:

[0034] 1-Mixing pipe; 2-Mounting retaining ring; 21-Intermediate mounting bracket positioning groove; 22-Second flange hole; 23-Side mounting bracket positioning groove; 3-Side mounting bracket; 31-Second end face support rod; 32-Second axial support rod; 33-Inclined groove; 34-Arc-shaped support rod; 4-Intermediate mounting bracket; 5-First mixing plate; 51-First clearance groove; 6-Second mixing plate. Detailed Implementation

[0035] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0036] Example 1

[0037] A specific embodiment of this utility model is as follows: Figure 1 , Figure 2 As shown, a gas-gas static mixer with a small length-to-diameter ratio and a large flow rate is disclosed, including a mixing pipe 1, a mounting ring 2, a mounting bracket, and a mixing plate.

[0038] The mixing pipe 1 has a length-to-diameter ratio of less than 1 and allows an airflow rate greater than 500 kg / s. Two mounting rings 2 are installed at both ends of the mixing pipe 1. Multiple mounting brackets are fixed inside the mixing pipe 1 by the mounting rings 2, and these brackets are arranged in parallel at intervals. Multiple mixing plates are evenly distributed inside the mixing pipe 1 by multiple mounting brackets, each extending from one end to the other. Each mixing plate is inclined relative to the axis of the mixing pipe 1. The mixing plates include a first mixing plate 5 and a second mixing plate 6, with the first mixing plate 5 inclined along a first direction and the second mixing plate 6 inclined along a second direction. The first and second directions are symmetrical about the axis of the mixing pipe 1. The first mixing plate 5 and the second mixing plate 6 are arranged alternately.

[0039] The airflow mixer in this embodiment uses an inclined mixing plate to divide the airflow into multiple small branches at the inlet of the mixing pipe 1. Each small branch changes its flow direction after passing through the mixing plate and forms a vortex negative pressure zone for mixing, achieving efficient airflow mixing. Since each mixing plate extends from one end of the mixing pipe 1 to the other, each small branch only needs to change its flow direction once, which reduces pressure loss and optimizes the length-to-diameter ratio to meet the compact space requirements of the aerial work platform. At the same time, the mixing plate is fixedly installed by a mounting bracket, which is fixed by a mounting retaining ring 2, simplifying the disassembly and maintenance process and improving the overall system efficiency and reliability.

[0040] In a preferred embodiment, the diameter of the mixing pipe 1 is between 1 meter and 3 meters. Flanges are provided at both ends of the mixing pipe 1, and the flanges have multiple through holes for connection to upstream or downstream pipes, or for stacking multiple mixers.

[0041] Specifically, see Figure 2 , Figure 3 as well as Figure 4 The mounting bracket includes two side mounting brackets 3 and multiple intermediate mounting brackets 4. Among the intermediate mounting brackets 4, the largest one is located in the middle of the mixing pipe 1, and the remaining intermediate mounting brackets 4 are arranged sequentially on both sides of the central intermediate mounting bracket 4. The two side mounting brackets 3 are located on the outermost sides of all the intermediate mounting brackets 4. In this embodiment, all mounting brackets are vertically arranged. In other embodiments, the mounting brackets may also be horizontally arranged or arranged in other directions.

[0042] See Figure 2 , Figure 3 Each intermediate mounting bracket 4 includes multiple first axial struts and two first end face struts. The multiple first axial struts are arranged in parallel at intervals, and the first end face struts are fixedly connected to both ends of the multiple first axial struts, forming a rectangular frame as a whole.

[0043] See Figure 4 The side mounting bracket 3 includes multiple second axial support rods 32, two second end face support rods 31, and two arc-shaped support rods 34. The multiple second axial support rods are arranged in parallel at intervals, and the second end face support rods 31 are fixedly connected to both ends of the multiple second axial support rods 32, forming a rectangular frame. The two ends of each arc-shaped support rod 34 are fixedly connected to both ends of a second end face support rod 31. The diameter of the arc-shaped support rod 34 is equal to the inner diameter of the mixing pipe 1. When the side mounting bracket 3 is placed inside the mixing pipe 1, the outer edge of the arc-shaped support rod 34 is at least partially in close contact with the inner wall of the mixing pipe 1.

[0044] The lengths of the first axial strut and the second axial strut 32 are equal to the axial length of the mixing pipe 1.

[0045] See Figure 4 Each first end face support rod, second end face support rod 31, and the inner side of the arc-shaped support rod 34 are provided with multiple inclined grooves 33, and the two side edges of the mixing plate are engaged in the inclined grooves 33. Furthermore, the inclined grooves 33 on both sides of each first end face support rod and second end face support rod 31 have opposite inclination directions. This arrangement ensures that the inclination directions of adjacent rows of mixing plates are opposite. The inclined grooves 33 are used to position the mixing plates and transmit the aerodynamic force applied to the mixing plates by the airflow during the mixer's operation. In a preferred embodiment, the mixing plate and the mounting frame are fitted with a clearance at the connection point of the inclined grooves 33 to prevent metal thermal stress from damaging the structure when there is a large temperature difference in the airflow.

[0046] In a preferred embodiment, the angle between the first and second directions and the axis of the mixing tube 1 ranges from 15° to 30°, preferably 20°. This angle setting prevents excessive pressure loss due to an excessively large vortex zone behind the plate. Furthermore, in this invention, the tilt angle of the mixing plate can be adjusted according to actual pressure drop requirements to ensure appropriate pressure loss.

[0047] Furthermore, the width of the mixing plate is 1 / 10 of the inner diameter of the mixing tube 1. The spacing between the mixing plates arranged along the same mounting bracket is 1 / 10 of the inner diameter of the mixing tube 1. This arrangement ensures good gas mixing over short distances. In this invention, the width and spacing of the mixing plates can also be adjusted according to actual size requirements.

[0048] See Figure 2 , Figure 5The mixing plate located in the middle of the mixing tube is a rectangular plate, and a first clearance groove 51 is provided in the middle of both sides of its edge. The edge of the mixing plate located on the side of the mixing tube that abuts against the mixing tube 1 is arc-shaped and fits tightly against the inner wall of the mixing tube 1 to ensure the mixing effect of the airflow near the wall. A second clearance groove is provided in the middle of the other edge of the mixing plate located on the side of the mixing tube. The mixing plate is a flat plate of uniform thickness. The first clearance groove 51 and the second clearance groove are used to avoid interference with the mounting bracket.

[0049] See Figure 1 , Figure 6 Mounting retaining rings 2 are installed at both ends of the mixing pipe 1, and their inner diameter is smaller than that of the mixing pipe 1. Two arc-shaped side mounting bracket positioning grooves 23 are symmetrically arranged on the inner circumferential surface of the mounting retaining rings 2 for fixing the arc-shaped support rods 34. The force on the side mounting brackets 3 is transmitted to the mounting retaining rings 2 through the side mounting bracket positioning grooves 23.

[0050] Multiple radially extending intermediate mounting bracket positioning grooves 21 are evenly provided on the upper and lower sides of the inner circumferential surface of the mounting retaining ring 2. The end of the first end face support rod of the intermediate mounting bracket 4 can be locked in the intermediate mounting bracket positioning groove 21 to fix the intermediate mounting bracket 4. The force on the intermediate mounting bracket 4 is transmitted to the mounting retaining ring 2 through the intermediate mounting bracket positioning groove 21.

[0051] The mounting retaining ring 2 is also provided with flange holes 22, which can be connected to both ends of the mixing pipe 1 via flanges, and complete the fixing of the mixing plate, mounting bracket and mounting retaining ring 2. The mounting retaining ring 2 is fixed to the mixing pipe 1 with bolts through the flange holes 22, so that the mounting retaining ring 2 can transmit the force to the mixing pipe 1 through the flange.

[0052] Using the structure of Embodiment 1, multiple gas-to-gas static mixers can be stacked and connected, and adjacent mixers can be installed in a staggered manner. This enables the fluid to be cut and merged from different directions, further enhancing the mixing effect. No energy input is required during use, the plates and rods are easy to process, placement and installation are convenient, and it has a certain degree of flexibility and expandability, facilitating modification of existing equipment and reducing the temperature non-uniformity at the inlet of the high-altitude test engine.

[0053] Compared with the prior art, the gas-gas static mixer provided in this embodiment has uniform gas mixing, low pressure loss, convenient installation, and easy maintenance.

[0054] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A gas-gas static mixer with a small aspect ratio and large flow rate pipeline, characterized in that, The system includes a mixing tube, mounting rings, mounting brackets, and mixing plates. There are two mounting rings, each disposed at one end of the mixing tube. Multiple mounting brackets are fixed within the mixing tube by the mounting rings and are arranged parallel to each other. Multiple mixing plates are evenly disposed within the mixing tube by the mounting brackets. Each mixing plate extends from one end of the mixing tube to the other and is inclined relative to the axis of the mixing tube. The mixing plates include staggered first and second mixing plates, with the first mixing plate inclined along a first direction and the second mixing plate inclined along a second direction. The first and second directions are symmetrical about the axis of the mixing tube.

2. The gas-gas static mixer with a small aspect ratio and large flow rate pipeline according to claim 1, characterized in that, The mounting bracket includes two side mounting brackets and multiple intermediate mounting brackets.

3. The gas-gas static mixer with a small aspect ratio and large flow rate pipeline according to claim 2, characterized in that, Each of the intermediate mounting brackets includes multiple first axial struts and two first end face struts; the multiple first axial struts are arranged in parallel at intervals, and the first end face struts are fixedly connected to both ends of the multiple first axial struts respectively.

4. The gas-gas static mixer with a small aspect ratio and large flow rate pipeline according to claim 3, characterized in that, The side mounting bracket includes multiple second axial support rods, two second end face support rods, and two arc-shaped support rods; the multiple second axial support rods are arranged in parallel at intervals, and the second end face support rods are fixedly connected to both ends of the multiple second axial support rods respectively; the two ends of each arc-shaped support rod are fixedly connected to both ends of one second end face support rod respectively; the diameter of the arc-shaped support rod is equal to the inner diameter of the mixing pipe.

5. The gas-gas static mixer with a small aspect ratio and large flow rate pipeline according to claim 4, characterized in that, Multiple inclined grooves are provided on both sides of each of the first end face support rods, the second end face support rods, and the inner side of each arc-shaped support rod. The two side edges of the mixing plate are engaged in the inclined grooves.

6. The gas-gas static mixer for a small aspect ratio, high flow rate pipeline according to claim 4 or 5, characterized in that, The inner diameter of the mounting retaining ring is smaller than the inner diameter of the mixing pipe. Two arc-shaped side mounting bracket positioning grooves are symmetrically arranged on the inner circumferential surface of the mounting retaining ring for fixing the arc-shaped support rod.

7. The gas-gas static mixer with a small aspect ratio and large flow rate pipeline according to claim 1, characterized in that, The mixing plate located in the middle of the mixing tube is a rectangular plate, and a first clearance groove is provided in the middle of the two side edges of the mixing plate; the edge of the mixing plate located on the side of the mixing tube that abuts against the mixing tube is arc-shaped and closely fits the inner wall of the mixing tube, and a second clearance groove is provided in the middle of the other side edge.

8. The gas-gas static mixer with a small aspect ratio and large flow rate pipeline according to claim 1, characterized in that, The angle between the first direction and the second direction and the axis of the mixing tube ranges from 15° to 30°.

9. The gas-gas static mixer for a small aspect ratio, high flow rate pipeline according to claim 1, characterized in that, The width of the mixing plate is 1 / 10 of the inner diameter of the mixing tube; the spacing between the mixing plates arranged along the same mounting bracket is 1 / 10 of the inner diameter of the mixing tube.

10. The gas-gas static mixer with a small aspect ratio and large flow rate pipeline according to claim 1, characterized in that, The mixing pipe is provided with a flange at its end, and the flange is provided with a through hole.

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