阅读说明：本技术 一种飞机测试用阀门式通风装置 (Valve type ventilation device for aircraft test ) 是由 成竹 王彬文 吴敬涛 都亚鹏 马建军 于 2021-12-01 设计创作，主要内容包括：本发明涉及飞机测试技术领域,具体涉及一种飞机测试用阀门式通风装置,包括多个采用满焊的方式连接而成的子管道以及设置在其中一个所述子管道内部的阀门；多个所述子管道均包括管道本体,填充在所述管道本体内部的防凝露垫以及用于加固所述管道本体的加固组件；本发明设计合理,能够有效地防止管道内、外两侧温差过大产生冷凝露水的问题,使得通风装置能够耐受极端环境及冷热剧烈交替,具备较佳的安全性能；并且,本发明子管道之间采用满焊的方式进行连接使得管道具备较高的密封性能,同时通过加固组件提高了通风装置整体结构的强度和刚度,极大的增强了通风装置的可靠性。(The invention relates to the technical field of airplane testing, in particular to a valve type ventilation device for airplane testing, which comprises a plurality of sub-pipelines and a valve, wherein the sub-pipelines are formed by connecting in a full-welding mode; the plurality of subducts each comprise a duct body, an anti-condensation pad filled inside the duct body and a reinforcing component for reinforcing the duct body; the invention has reasonable design, can effectively prevent the problem of condensation dew caused by overlarge temperature difference between the inner side and the outer side of the pipeline, enables the ventilation device to be resistant to extreme environment and violent alternation of cold and hot, and has better safety performance; in addition, the sub-pipelines are connected in a full-welding mode, so that the pipelines have high sealing performance, the strength and the rigidity of the whole structure of the ventilation device are improved through the reinforcing assembly, and the reliability of the ventilation device is greatly enhanced.)

1. A valve type ventilation device for an aircraft test comprises a plurality of sub-pipelines which are connected in a full-welding mode and a valve arranged in one of the sub-pipelines; the anti-condensation pipeline is characterized in that each of the plurality of sub-pipelines comprises a pipeline body (1), an anti-condensation pad (2) filled in the pipeline body (1) and a reinforcing component (3) used for reinforcing the pipeline body (1);

the pipeline body (1) comprises an internal pipe body (11), an external pipe body (12) capable of being sleeved outside the internal pipe body (11) and a connecting assembly (13) for connecting the internal pipe body (11) and the external pipe body (12);

the built-in pipe body (11) comprises a ventilation section pipe body (111) used for ventilation and connection section pipe bodies (112) connected to two ends of the ventilation section pipe body (111);

the ventilation section pipe body (111), the external pipe body (12) and the anti-condensation pad (2) are equal in length;

the connecting section pipe body (112) comprises a folding section (1121) with one end connected with the ventilating section pipe body (111) and a welding section (1122) connected to the other end of the folding section (1121); the welding section (1122) can be folded through the folding section (1121) until the welding section is perpendicular to the ventilation section pipe body (111); different built-in pipe bodies (11) are connected through the welding section (1122);

the external pipe body (12) is sleeved outside the ventilation section pipe body (111), and the external pipe body (12) and the ventilation section pipe body (111) form a clamping cavity capable of containing the anti-condensation pad (2);

the connecting components (13) are provided with a plurality of groups, and the connecting components (13) are uniformly arranged on the internal tube body (11) and the external tube body (12) in a matrix manner; the connecting component (13) comprises a connecting piece (131) capable of being welded on the outer wall of the ventilation section pipe body (111) and a screw (132) capable of penetrating through the external pipe body (12) and the anti-condensation pad (2) and connected with the connecting piece (131);

and through holes for the screw rods (132) to pass through are formed in the external pipe body (12) and the anti-condensation pad (2).

2. The valve type ventilation device for the aircraft test as claimed in claim 1, wherein the ventilation section tube body (111) comprises a first metal plate layer (1111), a thermal insulation layer (1112), and a second metal plate layer (1113) in sequence from top to bottom.

3. The valve type ventilation device for aircraft testing as claimed in claim 2, wherein the thermal insulation layer (1112) is made of aerogel thermal insulation material or graphite polystyrene board thermal insulation layer.

4. The valve type ventilation device for aircraft testing as claimed in claim 1, wherein a welding groove is reserved on the welding section (1122).

5. The valve type ventilation device for the aircraft test according to claim 1, wherein the anti-condensation pad (2) is connected with the outer side wall of the ventilation section pipe body (111) and the inner side wall of the external pipe body (12) through glue.

6. The valve-type ventilation device for aircraft testing according to claim 1, wherein the reinforcement element (3) is a first reinforcement element (31); the first reinforcing assembly (31) comprises a reinforcing frame (311) capable of being sleeved on the external pipe body (12) and a plurality of groups of reinforcing rib rods (312) used for connecting the reinforcing frame (311) and the welding sections (1122).

7. The valve-type ventilation device for aircraft testing according to claim 1, wherein the reinforcement element (3) is a second reinforcement element (32); the second reinforcing component (32) comprises two reinforcing frames (321) which are respectively arranged on the upper surface and the lower surface of the external pipe body (12) and a connecting rod (322) which is used for connecting the two reinforcing frames (321).

8. The valve-type ventilation device for aircraft testing as claimed in claim 7, wherein the reinforcing frame (321) has a cross-shaped or a # -shaped structure.

9. The valve type ventilation device for the aircraft test according to any one of claims 1 to 8, wherein the assembly method of the ventilation device comprises the following steps:

s1, assembling the subducting:

s1-1, uniformly installing the connecting pieces (131) on the outer wall of the ventilation section pipe body (111);

s1-2, sequentially assembling the anti-condensation pad (2) and the external pipe body (12) on the ventilation section pipe body (111), and then fixing the anti-condensation pad and the external pipe body through a screw (132);

s1-3, folding the folding section (1121) until the welding section (1122) is perpendicular to the ventilation section pipe body (111);

s1-4, assembling the reinforcing component (3) to complete a sub-pipeline;

s1-5, repeating the steps S1-1 to S1-4 until enough sub-pipelines with required number are assembled for standby;

s2, assembling the ventilation device:

and (4) sequentially connecting the sub-pipelines end to end in a full-welding manner, and arranging a valve in one of the sub-pipelines to complete the assembly of the ventilation device.

10. The valve type ventilation device for the aircraft test according to any one of claims 1 to 8, wherein the assembly method of the ventilation device comprises the following steps:

c1, assembling the built-in pipe body (11):

c1-1, folding the folding section (1121) until the welding section (1122) is vertical to the ventilation section pipe body (111);

c1-2, repeating the step C1-1 until a required number of built-in pipe bodies (11) are assembled for standby;

c1-3, carrying out full-welding connection on the built-in pipe bodies (11) through welding sections (1122);

c2, assembling the ventilation device:

c2-1, uniformly installing the connecting pieces (131) on the outer wall of each ventilation section pipe body (111);

c2-2, sequentially assembling the anti-condensation pad (2) and the external pipe body (12) on the ventilation section pipe body (111), and then fixing the anti-condensation pad and the external pipe body through a screw (132); and finally, assembling the valve to complete the assembly of the ventilation device.

Technical Field

The invention relates to the technical field of airplane testing, in particular to a valve type ventilation device for airplane testing.

Background

The comprehensive airplane laboratory is a large laboratory used for developing the research of climate environment test technology and test method in the aviation industry, and is used for completing the climate test of an airplane before airworthiness and ensuring that the airplane has flight capability under various climate conditions.

When the test engineering is carried out on the airplane, the temperature in the laboratory is controlled to rise and fall and uniformly distributed by adopting a method of raising and lowering the temperature of circulating air through a heat exchanger, so that a ventilation device needs to be arranged in the laboratory. The temperature change of the climate environment test is between-50 ℃ and +70 ℃, and due to the fact that cold and hot alternation is severe, the temperature range is wide, a large amount of condensation exists outside the ventilation device, the sealing is damaged, and the like, the condensation drops to damage electronic components of the test piece, the temperature stability of the test environment is damaged, and the safety of a laboratory is affected.

Therefore, it is necessary to design a valve type ventilation device for aircraft testing, which can prevent condensation, endure extreme environments and severe alternation of cold and heat, and has the advantages of high safety, strong reliability and low cost.

Disclosure of Invention

In order to solve the problems, the invention provides a valve type ventilation device for an aircraft test.

The technical scheme of the invention is as follows: a valve type ventilation device for an aircraft test comprises a plurality of sub-pipelines which are connected in a full-welding mode and a valve arranged in one of the sub-pipelines; the plurality of subducts each comprise a duct body, an anti-condensation pad filled inside the duct body and a reinforcing component for reinforcing the duct body;

the pipeline body comprises an internal pipe body, an external pipe body capable of being sleeved outside the internal pipe body and a connecting assembly for connecting the internal pipe body and the external pipe body;

the built-in pipe body comprises a ventilation section pipe body used for ventilation and connecting section pipe bodies connected to two ends of the ventilation section pipe body;

the ventilation section pipe body, the external pipe body and the anti-condensation pad are equal in length;

the connecting section pipe body comprises a folding section and a welding section, wherein one end of the folding section is connected with the ventilating section pipe body, and the welding section is connected to the other end of the folding section; the welding section can be folded through the folding section until the welding section is vertical to the pipe body of the ventilation section; different built-in pipe bodies are connected through the welding sections;

the external pipe body is sleeved outside the ventilation section pipe body, and the external pipe body and the ventilation section pipe body form a clamping cavity capable of placing the anti-condensation pad;

the plurality of groups of the connecting components are uniformly arranged on the internal tube body and the external tube body in a matrix manner; the connecting assembly comprises a connecting piece which can be welded on the outer wall of the ventilation section pipe body and a screw which can penetrate through the external pipe body and is connected with the connecting piece through the anti-condensation pad;

and the external pipe body and the anti-condensation pad are provided with through holes for the screw to pass through.

Further, the ventilation section pipe body sequentially comprises a first metal plate layer, a heat insulation layer and a second metal plate layer from top to bottom; utilize the metal sheet layer to add the structure that thermal-insulated layer adds the metal sheet layer and can play the heat preservation effect effectively, and then prevent the problem that the too big condensation dew that produces of the inside and outside difference in temperature of pipeline effectively.

Furthermore, the heat insulation layer is an aerogel heat insulation material heat insulation layer or a graphite polyphenyl plate heat insulation layer; the graphite polystyrene board is a heat insulation product with the optimal neutral valence ratio of all heat insulation materials at present; the aerogel thermal insulation material has the characteristic of light weight, and the mass of the whole structure can be effectively reduced.

Furthermore, a welding groove is reserved on the welding section; the welding groove is used for convenient welding treatment, and the full-welding treatment is used for connection, so that the production and installation cost is reduced, and the pipeline sealing performance is ensured.

Furthermore, the anti-condensation pad is connected with the outer side wall of the ventilation section pipe body and the inner side wall of the external pipe body through glue; the connection that make prevent condensation pad and ventilation section outside of tubes lateral wall, external body inside wall can be inseparable possesses better thermal insulation performance.

Further, the reinforcing component adopts a first reinforcing component; first reinforcement subassembly is used for connecting including can the cover reinforcing frame and the multiunit that establish on external body reinforcing frame, welding section's reinforcing bar pole.

Further, the reinforcing component adopts a second reinforcing component; the second reinforcing component comprises two reinforcing frames and connecting rods, wherein the two reinforcing frames are respectively placed on the upper surface and the lower surface of the external pipe body, and the connecting rods are used for connecting the two reinforcing frames.

Furthermore, the reinforcing frame adopts a cross-shaped or # -shaped structure; the type of the reinforcing frame can be selected according to actual scenes in actual use so as to meet the installation strength of the actual ventilation device.

Further, as one of the alternatives, the assembling method of the ventilation device is as follows:

s1, assembling the subducting:

s1-1, uniformly installing the connecting pieces on the outer wall of the pipe body of the ventilation section;

s1-2, sequentially assembling the anti-condensation pad and the external pipe body on the ventilation section pipe body, and then fixing the anti-condensation pad and the external pipe body through a screw;

s1-3, folding the folding section until the welding section is vertical to the ventilation section pipe body;

s1-4, assembling the reinforcing component to complete a sub-pipeline;

s1-5, repeating the steps S1-1 to S1-4 until enough sub-pipelines with required number are assembled for standby;

s2, assembling the ventilation device:

and (4) sequentially connecting the sub-pipelines end to end in a full-welding manner, and arranging a valve in one of the sub-pipelines to complete the assembly of the ventilation device.

Alternatively, the assembly method of the ventilation device comprises the following steps:

c1, assembling the built-in pipe body:

c1-1, folding the folding section until the welding section is vertical to the ventilation section;

c1-2, repeating the step C1-1 until the required number of built-in pipe bodies are assembled for standby;

c1-3, carrying out full-welding connection on all the built-in pipe bodies through welding sections;

c2, assembling the ventilation device:

c2-1, uniformly installing the connecting pieces on the outer wall of each ventilation section pipe body;

c2-2, sequentially assembling the anti-condensation pad and the external pipe body on the ventilation section pipe body, and then fixing the ventilation section pipe body through a screw; and finally, assembling the valve to complete the assembly of the ventilation device.

Compared with the prior art, the invention has the beneficial effects that: the invention has reasonable design, can effectively prevent the problem of condensation dew caused by overlarge temperature difference between the inner side and the outer side of the pipeline, enables the ventilation device to be resistant to extreme environment and violent alternation of cold and hot, and has better safety performance; in addition, the sub-pipelines are connected in a full-welding mode, so that the pipelines have higher sealing performance, the strength and the rigidity of the whole structure of the ventilation device are improved through the reinforcing assembly, and the reliability of the ventilation device is greatly enhanced; the invention has the advantages of simple integral structure, low manufacturing cost and low installation cost.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 of the present invention;

FIG. 2 is an exploded view of the structure of example 1 of the present invention;

fig. 3 is a schematic structural view of a built-in tube according to embodiment 4 of the present invention;

FIG. 4 is a partially enlarged view of the tube body incorporated in the embodiment 4 of the present invention;

FIG. 5 is an exploded view of the connection assembly of the present invention;

FIG. 6 is an exploded view of a reinforcement member according to example 4 of the present invention;

FIG. 7 is an exploded view of a reinforcement assembly according to example 8 of the present invention;

FIG. 8 is an exploded view of a reinforcement assembly according to example 9 of the present invention;

FIG. 9 is a process schematic of a subducting of embodiment 1 of the present invention;

the pipeline comprises a pipeline body 1, an internal pipe 11, a ventilation section pipe 111, a first metal plate layer 1111, a heat insulation layer 1112, a second metal plate layer 1113, a connection section pipe 112, a folding section 1121, a welding section 1122, an external pipe 12, a connection assembly 13, a connection assembly 131, a screw 132, a condensation-preventing pad 2, a reinforcement assembly 3, a first reinforcement assembly 31, a reinforcement frame 311, a reinforcement bar 32, a reinforcement assembly 32, a second reinforcement assembly 321, a reinforcement frame 321 and a connection rod 322.

Detailed Description

Example 1

As shown in fig. 1 and 2, the valve type ventilation device for the aircraft test comprises a plurality of sub-pipelines which are connected in a full-welding manner, and a valve arranged in one of the sub-pipelines; the plurality of sub-pipelines each comprise a pipeline body 1, an anti-condensation pad 2 filled in the pipeline body 1 and a reinforcing component 3 for reinforcing the pipeline body 1;

the pipeline body 1 comprises an internal pipe body 11, an external pipe body 12 capable of being sleeved outside the internal pipe body 11 and a connecting component 13 for connecting the internal pipe body 11 and the external pipe body 12;

as shown in fig. 2, the built-in pipe body 11 includes a ventilation section pipe body 111 for ventilation and a connection section pipe body 112 connected to both ends of the ventilation section pipe body 111;

the ventilation section pipe body 111, the external pipe body 12 and the anti-condensation pad 2 are equal in length;

the connection section pipe 112 includes a folding section 1121 whose one end is connected to the ventilation section pipe 111 and a welding section 1122 connected to the other end of the folding section 1121; the welding section 1122 can be folded by the folding section 1121 until it is perpendicular to the ventilation section pipe 111; different built-in pipe bodies 11 are connected through a welding section 1122;

the external pipe body 12 is sleeved outside the ventilation section pipe body 111, and the external pipe body 12 and the ventilation section pipe body 111 form a clamping cavity capable of placing the anti-condensation pad 2;

the connecting components 13 are provided with a plurality of groups, and the plurality of groups of connecting components 13 are uniformly arranged on the internal tube body 11 and the external tube body 12 in a matrix form; as shown in fig. 5, the connection assembly 13 includes a connection member 131 capable of being welded to the outer wall of the ventilation section pipe 111, and a screw 132 capable of passing through the outer pipe 12 and the anti-condensation pad 2 to be connected to the connection member 131;

the external pipe body 12 and the anti-condensation pad 2 are provided with through holes for the screw 132 to pass through.

It should be noted that:

the ventilation section tube 111, the folding section 1121, and the welding section 1122 of this embodiment are integrated;

the built-in pipe body 11 is a rectangular pipe body, the thickness of the built-in pipe body is 2.0mm, and the built-in pipe body is made of steel;

the external pipe body 12 is a rectangular pipe body, the thickness of the external pipe body is 0.3mm, and the external pipe body is made of stainless steel;

the connecting piece 131 is a connecting piece shaped like a Chinese character 'ji', a screw hole is arranged on the connecting piece 131, and the connecting piece 131 is welded on the outer wall of the ventilation section pipe body 111; the inner end of the screw 132 is connected with a screw hole on the connecting piece 131 through threads, and the outer end of the connecting piece 131 is fixed on the outer side of the external pipe body 12 through a nut; the screw 132 is made of polytetrafluoroethylene;

the anti-condensation pad 2 is a micro-nano heat insulation pad, and the thickness is 30 mm; and the thickness of the anti-condensation pad 2 is equal to the length of the welding section 1122;

the reinforcing component 3 is made of a stainless steel metal net and can be wrapped on the outer side wall of the external pipe body 12 and fixed through binding wires;

the valve adopts a valve body structure of a commercially available ventilation butterfly valve matched with the size of a ventilation channel of the built-in pipe body 11.

As shown in fig. 9, the assembling method of the ventilation device of the present embodiment specifically includes:

s1, assembling the subducting:

s1-1, uniformly installing the connecting pieces 131 on the outer wall of the ventilation section pipe body 111;

s1-2, sequentially assembling the anti-condensation pad 2 and the external pipe body 12 on the ventilation section pipe body 111, and then fixing the anti-condensation pad and the external pipe body through the screw 132;

s1-3, folding the folding section 1121 until the welding section 1122 is perpendicular to the ventilation section pipe body 111;

s1-4, assembling the reinforcing component 3 to complete a sub-pipeline;

s1-5, repeating the steps S1-1 to S1-4 until enough sub-pipelines with required number are assembled for standby;

s2, assembling the ventilation device:

and (4) sequentially connecting the sub-pipelines end to end in a full-welding manner, and arranging a valve in one of the sub-pipelines to complete the assembly of the ventilation device.

Example 2

The difference from the embodiment 1 is that: after the ventilation device is assembled, the welding position is wrapped by the condensation preventing pad 2.

Example 3

The difference from example 1 is: the anti-condensation pad 2 is a rubber sponge pad with the thickness of 50 mm.

It should be noted that: this embodiment is because prevent that condensation pad 2 adopts the material that the cost is lower but can not resist high temperature: the anti-condensation pad 2 is easy to deform and damage due to overhigh temperature when the welding section 1122 is welded by the rubber sponge pad; therefore, in the specific embodiment, a mode of welding firstly and assembling secondly is adopted.

The assembly method of the ventilation device in the embodiment specifically comprises the following steps:

c1, assembling the built-in pipe body 11:

c1-1, folding the folding section 1121 until the welding section 1122 is perpendicular to the ventilation section pipe body 111;

c1-2, repeating the step C1-1 until the required number of built-in pipe bodies 11 are assembled for standby;

c1-3, performing full-welding connection on the built-in pipe bodies 11 through welding sections 1122;

c2, assembling the ventilation device:

c2-1, uniformly installing the connecting pieces 131 on the outer wall of each ventilation section pipe body 111;

c2-2, sequentially assembling the anti-condensation pad 2 and the external pipe body 12 on the ventilation section pipe body 111, and then fixing the ventilation section pipe body through the screw 132; and finally, assembling the valve to complete the assembly of the ventilation device.

Example 4

The difference from example 1 is: as shown in fig. 3 and 4, the ventilation section pipe 111 includes, from top to bottom, a first metal plate layer 1111, a heat insulation layer 1112, and a second metal plate layer 1113; the thermal insulation layer 1112 is made of aerogel thermal insulation material.

As shown in fig. 6, the reinforcing member 3 employs a first reinforcing member 31; the first reinforcing member 31 includes a reinforcing frame 311 capable of being sleeved on the external pipe body 12 and a plurality of sets of reinforcing bars 312 for connecting the reinforcing frame 311 and the welding sections 1122.

It should be noted that:

the ventilation section tube 111, the folding section 1121, and the welding section 1122 of this embodiment are integrated;

the built-in pipe body 11 is a rectangular pipe body, and the thickness of the built-in pipe body is 5.0 mm; the thicknesses of the first metal plate layer 1111 and the second metal plate layer 1113 are both 1.0mm, and the first metal plate layer and the second metal plate layer are made of steel; the thickness of the heat insulation layer 1112 is 3.0 mm;

the external pipe body 12 is a rectangular pipe body, the thickness of the external pipe body is 0.3mm, and the external pipe body is made of stainless steel;

the anti-condensation pad 2 is a micro-nano heat insulation pad, and the thickness is 30 mm;

the connecting piece 131 is a connecting piece shaped like a Chinese character 'ji', a screw hole is arranged on the connecting piece 131, and the connecting piece 131 is welded on the outer wall of the ventilation section pipe body 111; the inner end of the screw 132 is connected with the screw hole on the connecting piece 131 through a thread, and the outer end of the connecting piece 131 is fixed outside the external pipe body 12 through a nut.

The assembly method of the ventilation device in the embodiment specifically comprises the following steps:

s1, assembling the subducting:

s1-1, uniformly installing the connecting pieces 131 on the outer wall of the ventilation section pipe body 111;

s1-2, sequentially assembling the anti-condensation pad 2 and the external pipe body 12 on the ventilation section pipe body 111, and then fixing the anti-condensation pad and the external pipe body through the screw 132;

s1-3, folding the folding section 1121 until the welding section 1122 is perpendicular to the ventilation section pipe body 111, and opening a hole in the welding section 1122 to manufacture a flange;

s1-4, assembling the reinforcing component 3 to complete a sub-pipeline;

s1-5, repeating the steps S1-1 to S1-4 until enough sub-pipelines with required number are assembled for standby;

s2, assembling the ventilation device:

connecting the sub-pipelines end to end in sequence: after the flange is connected, the joint is welded through full-welding type connection, and then the welding position is wrapped by the anti-condensation pad 2; and finally, assembling the valve to complete the assembly of the ventilation device.

Example 5

The difference from example 4 is: the thermal insulation layer 1112 is made of graphite polystyrene board.

It should be noted that: the built-in pipe body 11 is a rectangular pipe body, and the thickness of the built-in pipe body is 4.0 mm; the thicknesses of the first metal plate layer 1111 and the second metal plate layer 1113 are both 1.5mm, and the thickness of the heat insulation layer 1112 is 1.0 mm.

Example 6

The difference from example 4 is: a welding groove is reserved on the welding section 1122.

The assembly method of the ventilation device in the embodiment specifically comprises the following steps:

s1, assembling the subducting:

s1-1, uniformly installing the connecting pieces 131 on the outer wall of the ventilation section pipe body 111;

s1-2, sequentially assembling the anti-condensation pad 2 and the external pipe body 12 on the ventilation section pipe body 111, and then fixing the anti-condensation pad and the external pipe body through the screw 132;

s1-3, folding the folding section 1121 until the welding section 1122 is perpendicular to the ventilation section pipe body 111, opening a hole in the welding section 1122 to manufacture a flange, and preparing a welding groove in the welding section 1122;

s1-4, assembling the reinforcing component 3 to complete a sub-pipeline;

s1-5, repeating the steps S1-1 to S1-4 until enough sub-pipelines with required number are assembled for standby;

s2, assembling the ventilation device:

connecting the sub-pipelines end to end in sequence: welding the welding grooves through full welding type connection after the connection is carried out through the flanges; and then arranging a valve inside one of the sub-pipelines to finish the assembly of the ventilation device.

Example 7

The difference from example 4 is: the anti-condensation pad 2 is connected with the outer side wall of the ventilation section pipe body 111 and the inner side wall of the external pipe body 12 through glue.

Example 8

The difference from example 4 is: as shown in fig. 7, the reinforcing member 3 employs a second reinforcing member 32; the second reinforcing member 32 includes two reinforcing frames 321 respectively disposed on the upper and lower surfaces of the outer pipe body 12 and a connecting rod 322 for connecting the two reinforcing frames 321; wherein, the reinforcing frame 321 adopts a cross-shaped structure.

Example 9

The difference from example 7 is: as shown in fig. 8, the reinforcing frame 321 has a # -shaped structure.