A method for installing a return flow wind tunnel guide vane

Abstract

The present application provides a method for installing a reflow wind tunnel deflector, comprising spot welding two first fixed steel blocks on the outer wall surfaces of the upper ends of adjacent deflectors; spot welding two second fixed steel blocks on the outer wall surfaces of adjacent guide sleeves; spot welding multiple sets of spaced fixed steel bars on adjacent deflectors; completing the welding of the inlet cylinder, the outlet cylinder, and the elliptical ring, completing the welding of the inlet cylinder and the front section of the corner section, and completing the welding of the outlet cylinder and the rear section of the corner section; drawing a first projection line of the outer wall contour line of the upper end of the deflector on the inner wall of the elliptical ring, and drawing a second projection line of the outer wall contour line of the guide sleeve on the inner wall of the elliptical ring; moving the guide sleeve at the outermost end of the corner section to coincide with the second projection line, moving the upper end of the deflector at the outermost end of the corner section to coincide with the first projection line, and spot welding the guide sleeve, the deflector, and the elliptical ring; repeating the above steps until all guide sleeves, all deflectors, and the elliptical ring are spot welded. This method improves the installation accuracy of the deflector.

Description

Technical Field

[0001] The present application relates to the field of wind tunnels, and in particular to a method for installing a return flow wind tunnel guide vane. Background Art

[0002] A recirculation wind tunnel is a closed-loop wind tunnel connected end to end. Airflow circulates back through the tunnel, saving energy and preventing external interference. The corner section is a crucial component of a recirculation wind tunnel, consisting of an inlet and outlet cylinder, an elliptical ring, and guide vanes. The guide vanes allow the airflow to be redirected 90 degrees during tunnel operation.

[0003] The deflector vanes of a return-flow wind tunnel are installed within an elliptical ring, with their lower ends inserted into guide sleeves welded to the inner wall of the elliptical ring. The upper ends are welded directly to the inner wall of the elliptical ring. Deflector connecting plates are welded between adjacent deflector vanes. There are two existing methods for installing deflectors: one is to install the deflector vanes, guide sleeves, and deflector connecting plates within the elliptical ring, then assemble and weld the elliptical ring to the inlet and outlet cylinders, and finally hoist the corner section into place as a whole. The other is to install the deflector vanes, guide sleeves, and deflector connecting plates within the elliptical ring, then hoist the elliptical ring into place, and finally hoist the inlet and outlet cylinders separately into place.

[0004] The two existing installation methods maintain the correct angle when the guide vanes are installed within the elliptical ring. However, shrinkage and deformation during welding of the inlet and outlet cylinders to the elliptical ring and the front and rear sections of the corner section can cause the elliptical ring to shift, resulting in deviations in the guide vane's installation angle. This deviation in the installation angle of the guide vanes in a recirculation wind tunnel can create shock waves when the airflow turns 90 degrees, reducing the efficiency of the wind tunnel compressor. Summary of the Invention

[0005] The present application provides a method for installing a return-type wind tunnel guide vane, aiming to solve the problem of low installation accuracy of existing wind tunnel guide vanes.

[0006] The technical solution of this application is:

[0007] A method for installing a return flow wind tunnel guide vane comprises the following steps:

[0008] S1, insert each guide plate into the guide sleeve in sequence and fix it in the elliptical ring;

[0009] S2, spot welding two spaced-apart first fixing steel blocks between the outer wall surfaces of the upper ends of two adjacent guide vanes, and the two first fixing steel blocks are spot welded to the inner wall surface of the elliptical ring; spot welding two second fixing steel blocks between the outer wall surfaces of two adjacent guide sleeves, and the two second fixing steel blocks are spot welded to the inner wall surface of the elliptical ring; spot welding multiple groups of spaced-apart fixing steel bars between two adjacent guide vanes;

[0010] S3, hoisting the elliptical ring with the guide vane and the guide sleeve fixed thereto, then hoisting the inlet cylinder and the outlet cylinder respectively, completing the welding between the inlet cylinder, the outlet cylinder and the elliptical ring, and then completing the welding between the inlet cylinder and the front section of the corner section, and between the outlet cylinder and the rear section of the corner section;

[0011] S4, drawing a first projection line of the outer wall contour line of the upper end of the guide plate on the inner wall of the elliptical ring, and drawing a second projection line of the outer wall contour line of the guide sleeve on the inner wall of the elliptical ring;

[0012] S5, remove the guide plate at the outermost end of the corner section, the first fixed steel block, the second fixed steel block and the fixed steel bar on the guide sleeve, use a mechanical jack to press and move the guide sleeve at the outermost end of the corner section to coincide with the second projection line, use a mechanical jack to press and move the upper end of the guide plate at the outermost end of the corner section to coincide with the first projection line, and finally spot-weld the guide sleeve and the guide plate at the outermost end of the corner section to the elliptical ring respectively; repeat the above steps from outside to inside to remove the guide plates, the first fixed steel block, the second fixed steel block and the fixed steel bar on the guide sleeve at other positions on the corner section in turn, until all the guide sleeves coincide with the second projection line and are spot-welded and fixed to the elliptical ring in turn, and the upper ends of all the guide plates coincide with the first projection line and are spot-welded and fixed to the elliptical ring;

[0013] S6, installing the guide vane connecting plate, completing the welding between the guide vane, the guide sleeve and the elliptical ring, and finally completing the welding between the guide vane connecting plate and the guide vane.

[0014] As a technical solution of the present application, in step S2, multiple groups of the fixed steel bars are arranged in sequence along the busbar direction of the guide vane, and each group of the fixed steel bars consists of two, and each of the fixed steel bars is located on a plane perpendicular to the busbar of the guide vane.

[0015] As a technical solution of the present application, in step S4, a laser tracker is used to establish a Cartesian coordinate system of a recirculation wind tunnel, and the coordinate values ​​of multiple points of the first projection line and the second projection line are calculated using the three-dimensional model of the recirculation wind tunnel. The positions of multiple points of the first projection line and the second projection line are determined and marked using the intelligent probe of the laser tracker, and finally the first projection line and the second projection line are drawn.

[0016] As a technical solution of the present application, in step S5, the guide vane and the guide sleeve at the outermost end of the corner section are close to the outside of the entire loop of the recirculation wind tunnel, and the guide vane and the guide sleeve at the innermost end of the corner section are close to the inside of the entire loop of the recirculation wind tunnel; the positions of the guide vanes are adjusted one by one in the order from the guide vane at the outermost end of the corner section to the guide vane at the innermost end, so that the guide sleeve coincides with the second projection line and the upper end of the guide vane coincides with the first projection line.

[0017] As a technical solution of the present application, in step S5, the fixing steel bar is spot-welded by gas tungsten arc welding, and the guide plate connecting plate is welded by gas tungsten arc welding.

[0018] The present application provides a method for installing a return-flow wind tunnel guide vane. After the corner section is hoisted into position and the closing seam welding of the inlet and outlet cylinders, the elliptical ring, and the front and rear sections of the corner section is completed, the guide vane and guide vane connecting plate are finally installed. This method solves the problem of shrinkage deformation during the welding of the closing seam and can reduce the installation accuracy of the installed guide vane, thereby improving the efficiency of the wind tunnel compressor and saving costs. At the same time, this method temporarily fixes the guide vane within the elliptical ring using a first fixed steel block, a second fixed steel block, and a fixed steel bar for overall hoisting, thereby avoiding the problem of welding the inlet and outlet cylinders to the elliptical ring and then hoisting them separately. This reduces the difficulty of installing the guide vane, shortens the construction period, and saves time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate the following technical solutions of the present application.

[0020] Certain embodiments of the application should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the connection between the elliptical ring, the guide vane, and the guide sleeve provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the guide vane and guide sleeve provided in an embodiment of the present application being fixed within an elliptical ring;

[0023] Figure 3 A schematic diagram of the first process of installing a guide vane according to an embodiment of the present application;

[0024] Figure 4 A schematic diagram of the second process of installing the guide vane according to an embodiment of the present application;

[0025] Figure 5 Schematic diagram of the third process of installing the guide vane provided in an embodiment of the present application.

[0026] Icon: 1-elliptical ring; 2-guide vane; 3-guide sleeve; 4-guide vane connecting plate; 5-second fixed steel block; 6-fixed steel bar; 7-inlet cylinder; 8-outlet cylinder. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition or explanation in subsequent drawings.

[0030] In the description of this application, it should be noted that the terms "upper" and "lower" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the invented product is usually placed when in use. These are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0031] In addition, in this application, unless otherwise expressly specified or limited, the phrase "a first feature is above or below a second feature" may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, the phrases "above, above, and above the second feature" may include the first feature being directly above and obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The phrases "below, below, and below the second feature" may include the first feature being directly below and obliquely below the second feature, or simply indicate that the first feature is lower in level than the second feature.

[0032] In addition, the terms "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", not that the structure must be completely horizontal, but can be slightly tilted.

[0033] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0034] Example:

[0035] Please refer to Figure 1 , multiple guide vanes 2 are installed in parallel and at intervals in the elliptical ring 1, the lower end of each guide vane 2 is inserted into the guide sleeve 3 on the bottom of the inner wall of the elliptical ring 1, and multiple guide sleeves 3 are welded to the inner wall of the elliptical ring 1 in parallel and at intervals. The upper end of each guide vane 2 is directly welded to the top of the inner wall of the elliptical ring 1, and a guide vane connecting plate 4 is welded between two adjacent guide vanes 2.

[0036] like Figure 2 As shown, the guide vane 2 is inserted into the guide sleeve 3 and temporarily fixed in the elliptical ring 1, two first fixed steel blocks are spot welded between the upper outer wall surface of two adjacent guide vanes 2 and the inner wall surface of the elliptical ring 1, two second fixed steel blocks 5 are spot welded between the outer wall surface of two adjacent guide sleeves 3 and the inner wall surface of the elliptical ring 1, and multiple groups of fixed steel bars 6 are spot welded between adjacent guide vanes 2 using tungsten inert gas shielded welding; at the same time, multiple groups of fixed steel bars 6 are arranged at intervals along the busbar direction of the guide vane 2, and each group of fixed steel bars 6 has two and is on a plane perpendicular to the busbar of the guide vane 2.

[0037] like Figure 3 As shown, the elliptical ring 1 fixed with the guide vane 2 and the guide sleeve 3 is hoisted into position, and then the inlet cylinder 7 and the outlet cylinder 8 are hoisted respectively, and the welding of the inlet cylinder 7, the outlet cylinder 8 and the elliptical ring 1 is completed, and the welding between the inlet cylinder 7 and the front section of the corner section is completed, and the welding between the outlet cylinder 8 and the rear section of the corner section is completed.

[0038] like Figure 4As shown, a laser tracker is used to establish a Cartesian coordinate system of the recirculation wind tunnel. The three-dimensional model of the recirculation wind tunnel is used to calculate the coordinate values ​​of multiple points of the first projection line of the outer wall contour line of the upper end of the guide vane 2 on the inner wall of the elliptical ring 1 and the second projection line of the outer wall contour line of the guide sleeve 3 on the inner wall of the elliptical ring 1. The intelligent probe of the laser tracker is used to determine the positions of multiple points of the first projection line and the second projection line and mark them. Finally, the first projection line and the second projection line are drawn.

[0039] like Figure 4 As shown, the guide vanes 2 and guide sleeves 3 at the outermost ends of the corner sections are close to the outside of the entire recirculation wind tunnel circuit, while the guide vanes 2 and guide sleeves 3 at the innermost ends of the corner sections are close to the inside of the entire recirculation wind tunnel circuit. First, the first fixing steel block, the second fixing steel block 5, and the fixing steel bar 6 of the guide vanes 2 and guide sleeves 3 at the outermost ends of the corner sections are removed. A mechanical jack is used to press and move the guide sleeves 3 at the outermost ends of the corner sections so that they coincide with the second projection line. A mechanical jack is also used to press and move the upper end of the guide vanes 2 at the outermost ends of the corner sections so that they coincide with the first projection line. Finally, the guide sleeves 3 and guide vanes 2 at the outermost ends of the corner sections are spot welded to the elliptical ring 1. Remove the guide vane 2 at the outermost end of the corner section to the innermost end in sequence, repeat the above steps, adjust the position of the guide vane 2 one by one so that the guide sleeve 3 coincides with the second projection line, and the upper end of the guide vane 2 coincides with the first projection line, until all the guide sleeves 3 coincide with the second projection line and are spot welded to the elliptical ring 1, and the upper ends of the guide vanes 2 coincide with the first projection line and are spot welded to the elliptical ring 1.

[0040] like Figure 5 As shown, the guide vane connecting plate 4 is installed, and then the guide vane 2, the guide sleeve 3 and the elliptical ring 1 are welded. Finally, tungsten inert gas shielded welding is used to complete the welding of the guide vane connecting plate 4 and the guide vane 2.

[0041] In summary, this method develops a technique for installing guide vanes 2 after hoisting the corner section into position and completing all closure seam welding. This solves the problem of shrinkage deformation during closure seam welding that reduces the installation accuracy of installed guide vanes, improves the efficiency of the wind tunnel compressor, and saves costs. Furthermore, this method employs a process that temporarily secures guide vanes 2 within the elliptical ring 1, hoists the entire assembly into position, and then precisely installs it. This solves the difficulty and inefficiency of separately hoisting guide vanes 2 after hoisting the corner section into position. This reduces the difficulty of installing guide vanes 2, shortens the construction period, and saves time and effort.

[0042] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A method for installing a return flow wind tunnel guide vane, characterized in that: The following steps are involved: S1, insert each guide plate into the guide sleeve in sequence and fix it in the elliptical ring; S2, spot welding two spaced-apart first fixing steel blocks between the outer wall surfaces of the upper ends of two adjacent guide vanes, and the two first fixing steel blocks are spot welded to the inner wall surface of the elliptical ring; spot welding two second fixing steel blocks between the outer wall surfaces of two adjacent guide sleeves, and the two second fixing steel blocks are spot welded to the inner wall surface of the elliptical ring; spot welding multiple groups of spaced-apart fixing steel bars between two adjacent guide vanes; S3, hoisting the elliptical ring with the guide vane and the guide sleeve fixed thereto, then hoisting the inlet cylinder and the outlet cylinder respectively, completing the welding between the inlet cylinder, the outlet cylinder and the elliptical ring, and then completing the welding between the inlet cylinder and the front section of the corner section, and between the outlet cylinder and the rear section of the corner section; S4, drawing a first projection line of the outer wall contour line of the upper end of the guide vane on the inner wall of the elliptical ring, and drawing a second projection line of the outer wall contour line of the guide sleeve on the inner wall of the elliptical ring; in step S4, using a laser tracker to establish a Cartesian coordinate system of the recirculation wind tunnel, using a three-dimensional model of the recirculation wind tunnel to calculate the coordinate values ​​of multiple points of the first projection line and the second projection line, using the intelligent probe of the laser tracker to determine the positions of the multiple points of the first projection line and the second projection line and mark them, and finally drawing the first projection line and the second projection line; S5, remove the guide plate at the outermost end of the corner section, the first fixed steel block, the second fixed steel block and the fixed steel bar on the guide sleeve, use a mechanical jack to press and move the guide sleeve at the outermost end of the corner section to coincide with the second projection line, use a mechanical jack to press and move the upper end of the guide plate at the outermost end of the corner section to coincide with the first projection line, and finally spot-weld the guide sleeve and the guide plate at the outermost end of the corner section to the elliptical ring respectively; repeat the above steps from outside to inside to remove the guide plates, the first fixed steel block, the second fixed steel block and the fixed steel bar on the guide sleeve at other positions on the corner section in turn, until all the guide sleeves coincide with the second projection line and are spot-welded and fixed to the elliptical ring in turn, and the upper ends of all the guide plates coincide with the first projection line and are spot-welded and fixed to the elliptical ring; S6, installing the guide vane connecting plate, completing the welding between the guide vane, the guide sleeve and the elliptical ring, and finally completing the welding between the guide vane connecting plate and the guide vane.

2. The method for installing a backflow wind tunnel guide vane according to claim 1, characterized in that: In step S2, a plurality of groups of the fixed steel bars are sequentially arranged at intervals along the busbar direction of the guide vane, and each group of the fixed steel bars consists of two, and each of the fixed steel bars is located on a plane perpendicular to the busbar direction of the guide vane.

3. The method for installing a backflow wind tunnel guide vane according to claim 1, characterized in that: In step S5, the guide vane and the guide sleeve at the outermost end of the corner section are close to the outside of the entire loop of the recirculation wind tunnel, and the guide vane and the guide sleeve at the innermost end of the corner section are close to the inside of the entire loop of the recirculation wind tunnel; the positions of the guide vanes are adjusted one by one in the order from the guide vane at the outermost end of the corner section to the guide vane at the innermost end, so that the guide sleeve coincides with the second projection line and the upper end of the guide vane coincides with the first projection line.

4. The method for installing a backflow wind tunnel guide vane according to claim 1, wherein: In step S5, the fixing steel bars are spot-welded by gas tungsten arc welding, and the guide plate connecting plates are welded by gas tungsten arc welding.

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