Protective net mechanism special for large-size high-speed wind tunnel and mounting structure of protective net mechanism

Abstract

The invention belongs to the technical field of wind tunnel safety protection, and discloses a protective net mechanism special for a large-size high-speed wind tunnel and an installation structure of the protective net mechanism. The protective net mechanism comprises a supporting ring, a protective rope of a net structure is arranged in the supporting ring, a spherical hinge base is arranged on the inner wall of the supporting ring, the two ends of the protective rope are both connected with a ball head rod, and a spherical hinge structure is formed between the spherical hinge base and the ball head rod. The installation structure comprises the wind tunnel and further comprises the protection net mechanism special for the large-size high-speed wind tunnel, and the supporting ring is arranged at the tail section of the wind tunnel in the mode of being perpendicular to the wind direction. The spherical hinge structure has the beneficial effects that the spherical hinge structure is used for replacing hard friction between a traditional steel wire rope and an iron ring, the friction direction is changed to change sliding friction into rolling friction, damage to the connecting position is effectively avoided, and the service life of the mechanism is prolonged.

Description

Technical Field

[0001] The present application belongs to the technical field of wind tunnel safety protection, and specifically relates to a special protective net mechanism for a large-scale high-speed wind tunnel and its installation structure. Background Art

[0002] Large-scale high-speed wind tunnel models are large in size. Since it is inevitable that model parts or even models will be blown away by airflow during the test, each large-scale high-speed wind tunnel needs to establish a protective net structure at necessary locations.

[0003] In the current structure, the protective net is often exposed to high-speed airflow during the blowing process, so it needs to be replaced frequently. In order to improve the replacement efficiency, the protective net currently used is an iron ring arrangement with one or two 10mm steel wires passing through a circle of the pipe. Due to the back and forth movement of the airflow, there are many friction points between the steel wire and the iron ring, which is easily damaged and difficult to repair, which has a certain degree of impact on the efficiency of the test. Summary of the invention

[0004] The purpose of this application is to provide a special protective net mechanism for a large-sized high-speed wind tunnel and its installation structure, which solves the problem of friction between the existing protective net wire rope and the iron ring.

[0005] The purpose of this application is achieved through the following technical solutions:

[0006] A protective net mechanism specially used for a large-sized high-speed wind tunnel comprises a support ring, a protective rope in a mesh structure is arranged inside the support ring, a ball joint seat is provided on the inner wall of the support ring, both ends of the protective rope are connected to a ball head rod, and a ball joint structure is formed between the ball joint seat and the ball head rod.

[0007] Furthermore, the support ring is made of iron, and the protective rope is a steel wire rope.

[0008] Furthermore, the support ring is a circular ring structure, and the protective ropes are arranged symmetrically left to right and up to down.

[0009] Furthermore, the protective rope is in a mesh structure that crosses horizontally and vertically.

[0010] Furthermore, the protective rope is a front-to-back staggered braided structure.

[0011] Furthermore, the matching relationship between the ball head rod and the end of the protective rope is one-to-one.

[0012] Furthermore, the ball joint seat is provided with a ball groove, the ball head rod includes a rod body and a ball head, the outer end of the rod body is connected to the ball head, a ball joint structure is formed between the ball groove and the ball head, and the inner end of the rod body is connected to the protective rope.

[0013] Furthermore, the ball joint seat includes a seat bottom plate and a seat cover plate, the seat bottom plate is fixed on the support ring, the seat bottom plate is connected to the seat cover plate and a ball groove is formed therebetween.

[0014] Furthermore, the ball head rod includes a rod body and a threaded rod, the inner end of the rod body is provided with a threaded inner hole, the outer end of the threaded rod is threadedly connected in the threaded inner hole, the inner end of the threaded rod is provided with a rope inner hole, and the end of the protective rope is buckled in the rope inner hole.

[0015] A mounting structure for a special protective net mechanism for a large-sized high-speed wind tunnel comprises a wind tunnel and the above-mentioned special protective net mechanism for a large-sized high-speed wind tunnel, wherein a support ring is arranged at a rear section of the wind tunnel perpendicular to the wind direction.

[0016] Beneficial effects of this application:

[0017] (1) The ball joint structure replaces the hard friction between the traditional wire rope and the iron ring, and changes the friction direction to replace the sliding friction with the rolling friction, which effectively avoids damage to the connection position and extends the service life of the mechanism.

[0018] (2) The active connection between the protective rope and the support ring is realized through the ball joint structure. The force of the high-speed airflow on the protective net is adaptively adjusted through the ball joint structure to avoid stress concentration at the connection and reduce deformation and damage at the connection.

[0019] (3) The support ring adopts a circular ring structure as a whole, and the protective ropes are arranged symmetrically. Therefore, the forces exerted by the protective ropes on the support ring can offset each other in the direction perpendicular to the wind direction, ensuring the overall force balance of the support ring, so that the support ring has better stability after installation.

[0020] (4) The ball joint structure and the end of the protective rope are in a one-to-one correspondence, so the force of a single protective rope acts on a single ball joint structure, ensuring that the force direction of the protective rope is consistent with the swing direction of the ball head rod, optimizing the force of the ball joint structure, and ensuring a smooth transition of the structure's force.

[0021] (5) The support ring is arranged perpendicular to the wind direction of the wind tunnel, which does not affect the flow field of the high-speed airflow in the wind tunnel. The airflow and the objects blown away only exert a force on the protective rope along the wind direction, which can reduce the unbalanced load on the support ring, thereby ensuring the stability of the support ring structure.

[0022] The aforementioned main scheme of the present application and its further options can be freely combined to form multiple schemes, all of which are schemes that can be adopted and claimed for protection in the present application; and in the present application, (non-conflicting options) can also be freely combined with each other and with other options. After understanding the scheme of the present application, those skilled in the art can understand that there are many combinations based on the prior art and common knowledge, all of which are technical schemes to be protected by the present application, and they are not exhaustively listed here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural isometric view of the present application.

[0024] Figure 2 It is the structural front view of this application.

[0025] Figure 3 It is a structural schematic diagram of the ball joint structure of the present application.

[0026] In the figure: 1-support ring, 2-protection rope, 3-ball joint seat, 4-ball head rod; 301-seat bottom plate, 302-seat cover plate, 303-ball groove, 401-rod body, 402-ball head, 403-threaded inner hole, 404-threaded rod, 405-rope inner hole. DETAILED DESCRIPTION

[0027] The following non-limiting examples are provided to illustrate the present application.

[0028] Example 1

[0029] refer to Figure 1 , Figure 2 and Figure 3 As shown, a special protective net mechanism for a large-sized high-speed wind tunnel includes a support ring 1, a protective rope 2, a ball joint seat 3 and a ball head rod 4.

[0030] The support ring 1 is an iron ring-shaped basic frame, which is used to place and fix the protection rope 2 and to place and fix the entire mechanism in the wind tunnel. The support ring 1 is arranged with a mesh-shaped protection rope 2, which is a steel wire rope. Several protection ropes 2 are woven into a protection net to block objects.

[0031] The support ring 1 is a circular ring structure, and the protective rope 2 is arranged symmetrically left and right and up and down. The force on the protective rope 2 is also arranged symmetrically left and right and up and down, and then acts on the circular support ring 1, which can be offset on the support ring 1, which is beneficial to the overall force balance of the support ring 1.

[0032] The protective ropes 2 are in a mesh structure that intersects horizontally and vertically, that is, the horizontal protective ropes 2 are horizontal, and the vertical protective ropes 2 are vertical. The protective ropes 2 are in a front-to-back staggered weaving structure. Taking a certain horizontal protective rope 2 as an example, the horizontal protective rope 2 is located in front of a vertical protective rope 2, and the horizontal protective rope 2 is located behind the next vertical protective rope 2, so that a plurality of protective ropes 2 are staggered front-to-back to form an overall force-bearing protective net.

[0033] The inner wall of the support ring 1 is provided with a ball joint seat 3, and both ends of the protection rope 2 are connected to the ball head rod 4, and a ball joint structure is formed between the ball joint seat 3 and the ball head rod 4. The sliding friction between the traditional protection rope 2 and the support ring 1 is replaced by rolling friction, which effectively avoids damage to the connection position and prolongs the service life of the mechanism. In addition, the ball joint structure can be adaptively adjusted according to the deformation of the protection rope 2, change the force direction, avoid stress concentration at the connection, and reduce deformation and damage at the connection.

[0034] The ball-joint structure allows the protection rope 2 to swing more easily relative to the wind direction, and the swing range of the protection rope 2 is also increased. For the protection rope 2 with the same force, the protection rope 2 with a larger swing angle can obtain a larger axial force (component force) along the wind direction and a smaller radial force (component force) perpendicular to the wind direction. The axial force limit of the support ring 1 is large, but the radial unsupported force limit is small, so the ball-joint structure is applied to the field of wind tunnel protection, reducing the strength requirements of the support ring 1. Or the support ring 1 of the same strength can be used in wind tunnels with higher wind speeds through the ball-joint structure.

[0035] The matching relationship between the ball head rod 4 and the end of the protective rope 2 is one-to-one, so the force of a single protective rope acts on a single ball joint structure, ensuring that the force direction of the protective rope is consistent with the swing direction of the ball head rod, and avoiding the problem that when multiple protective ropes 2 are adapted to a single ball joint structure, the force direction of the protective rope is inconsistent with the force direction of the ball head rod, thereby optimizing the force of the ball joint structure and ensuring smooth force transition of the structure.

[0036] The ball joint seat 3 includes a seat base plate 301 and a seat cover plate 302. The seat base plate 301 is welded or screwed to the inner wall of the support ring 1. The windward side of the seat base plate 301 is provided with a slope to facilitate airflow guidance and circulation. The seat base plate 301 and the seat cover plate 302 are connected by bolts, and a ball groove 303 is formed therebetween, and the ball groove 303 can limit the ball head 402 therein.

[0037] The ball head rod 4 includes a rod body 401, a ball head 402 and a threaded rod 404. The outer end of the rod body 401 is integrally connected to the ball head 402, and a ball joint structure is formed between the ball groove 303 and the ball head 402, thereby realizing a movable connection between the protective rope 2 and the support ring 1.

[0038] The inner end of the rod body 401 is provided with a threaded inner hole 403, the outer end of the threaded rod 404 is threadedly connected in the threaded inner hole 403, the inner end of the threaded rod 404 is provided with a rope inner hole 405, and the end of the protective rope 2 is buckled in the rope inner hole 405. Through the threaded assembly between the threaded rod 404 and the rod body 401, it is convenient to replace the protective rope 2 when it is damaged without replacing the entire protective net. Secondly, after the threaded connection is installed in place, the rope body can be tightened by twisting, which is convenient for adjusting the tension of the rope body and is conducive to on-site installation operations.

[0039] After trial, the protection net mechanism can realize the current layout mode, and the swing angle can reach 45° at the maximum position. There is a universal ball head inside the structure, which can appropriately reduce friction, reduce the load on the wire rope, and increase the service life. Unlike the previous structure, the wire rope is easily worn. The current mechanism uses a one-to-one installation of protective ropes, and the wire ropes are arranged separately. One wire rope is connected to two ball joint structures. If one is damaged, only one needs to be replaced, and the whole does not need to be replaced. It is convenient to replace after damage. At the same time, the wire rope of the mechanism has a large swing angle, which is conducive to the internal layout of the pipeline.

[0040] Example 2

[0041] A mounting structure for a special protective net mechanism for a large-sized high-speed wind tunnel comprises a wind tunnel and also comprises the special protective net mechanism for a large-sized high-speed wind tunnel of embodiment 1, wherein a support ring 1 is arranged at a rear section of the wind tunnel perpendicular to the wind direction.

[0042] In order to facilitate uniform airflow in the wind tunnel, several partitions can be hinged on the protective rope 2, and the hinge axis of the partition is the axis of the rope body, so that the flow cross-section in the support ring 1 can be evenly divided into a number of squares by using the partition, which is conducive to uniform separation of the airflow at the tail section of the wind tunnel and ensures the stability of the flow field.

[0043] The support ring is arranged perpendicular to the wind direction of the wind tunnel, which does not affect the flow field of the high-speed airflow in the wind tunnel. The airflow and the blown objects only exert force on the protective rope along the wind direction, which can reduce the unbalanced load on the support ring and thus ensure the stability of the support ring structure.

[0044] The aforementioned basic examples and their further selected examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection in this application. In the scheme of this application, each selected example can be arbitrarily combined with any other basic examples and selected examples.

[0045] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A protective net structure for a large-scale high-speed wind tunnel, comprising a support ring (1), characterized in that: A protective rope (2) having a mesh structure is arranged inside the support ring (1), a ball joint seat (3) is provided on the inner wall of the support ring (1), both ends of the protective rope (2) are connected to a ball head rod (4), and a ball joint structure is formed between the ball joint seat (3) and the ball head rod (4).

2. The protective net mechanism for a large-scale high-speed wind tunnel according to claim 1 is characterized in that: The support ring (1) is made of iron, and the protective rope (2) is a steel wire rope.

3. The protective net mechanism for a large-scale high-speed wind tunnel according to claim 1 or 2, characterized in that: The support ring (1) is a circular ring structure, and the protective rope (2) is arranged symmetrically left and right and up and down.

4. The protective net mechanism for a large-scale high-speed wind tunnel according to claim 1 is characterized in that: The protective rope (2) is in a mesh structure that intersects horizontally and vertically.

5. The protective net mechanism for a large-scale high-speed wind tunnel according to claim 1 or 4, characterized in that: The protective rope (2) is a front-to-back staggered braided structure.

6. The protective net mechanism for a large-scale high-speed wind tunnel according to claim 1 is characterized in that: The matching relationship between the ball head rod (4) and the end of the protective rope (2) is one-to-one.

7. The protective net mechanism for a large-scale high-speed wind tunnel according to claim 1 is characterized in that: The ball joint seat (3) is provided with a ball groove (303), the ball head rod (4) comprises a rod body (401) and a ball head (402), the outer end of the rod body (401) is connected to the ball head (402), a ball joint structure is formed between the ball groove (303) and the ball head (402), and the inner end of the rod body (401) is connected to the protective rope (2).

8. The protective net mechanism for a large-scale high-speed wind tunnel according to claim 7 is characterized in that: The ball joint seat (3) comprises a seat bottom plate (301) and a seat cover plate (302), wherein the seat bottom plate (301) is fixed on the support ring (1), and the seat bottom plate (301) is connected to the seat cover plate (302) to form a ball groove (303) therebetween.

9. The protective net mechanism for a large-scale high-speed wind tunnel according to claim 1, 7 or 8, characterized in that: The ball head rod (4) comprises a rod body (401) and a threaded rod (404); the inner end of the rod body (401) is provided with a threaded inner hole (403); the outer end of the threaded rod (404) is threadedly connected in the threaded inner hole (403); the inner end of the threaded rod (404) is provided with a rope inner hole (405); the end of the protective rope (2) is buckled in the rope inner hole (405).

10. A mounting structure for a protective net mechanism for a large-scale high-speed wind tunnel, comprising a wind tunnel, characterized in that: It also comprises a protective net mechanism for a large-sized high-speed wind tunnel as claimed in any one of claims 1 to 9, wherein the support ring (1) is arranged at the tail section of the wind tunnel perpendicular to the wind direction.

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