阅读说明：本技术 一种用于负压装置的穿线孔密封装置及密封方法 (Threading hole sealing device and method for negative pressure device ) 是由 张轲 张平涛 孙才国 罗英杰 吕波 李自雨 于 2021-10-13 设计创作，主要内容包括：本发明适用于风洞试验技术领域,提供一种用于负压装置的穿线孔密封装置及密封方法,包括安装套和连接件；安装套为中空的圆台结构,包含对称设置的第一安装套主体和第二安装套主体,第一安装套主体和第二安装套主体铰接；安装套的内部设置有隔板；隔板由分别设置在第一安装套主体和第二安装套主体内侧面的左隔板和右隔板组成；并且隔板上设置有穿线孔；第一安装套和第二安装套的主体上都设置有连接部。本发明的密封装置为圆台结构,小端的直径小于预留穿线孔的直径,将安装套的小端推进预留穿线孔中,试验过程中随着负压装置内负压的增加,密封性能增加。(The invention is suitable for the technical field of wind tunnel tests, and provides a threading hole sealing device and a threading hole sealing method for a negative pressure device, wherein the threading hole sealing device comprises an installation sleeve and a connecting piece; the mounting sleeve is of a hollow round table structure and comprises a first mounting sleeve main body and a second mounting sleeve main body which are symmetrically arranged, and the first mounting sleeve main body is hinged with the second mounting sleeve main body; a partition plate is arranged inside the mounting sleeve; the partition plate consists of a left partition plate and a right partition plate which are respectively arranged on the inner side surfaces of the first mounting sleeve main body and the second mounting sleeve main body; and the clapboard is provided with a threading hole; the main bodies of the first mounting sleeve and the second mounting sleeve are provided with connecting parts. The sealing device is of a circular truncated cone structure, the diameter of the small end is smaller than that of the reserved threading hole, the small end of the mounting sleeve is pushed into the reserved threading hole, and the sealing performance is improved along with the increase of negative pressure in the negative pressure device in the test process.)

1. A threading hole sealing device for a negative pressure device is characterized by comprising a mounting sleeve (10) and a connecting piece;

the mounting sleeve (10) is of a hollow circular truncated cone structure and comprises a first mounting sleeve main body (11) and a second mounting sleeve main body (12) which are symmetrically arranged, and the first mounting sleeve main body (11) is hinged with the second mounting sleeve main body (12);

a first partition plate (13) is arranged on the inner side of the mounting sleeve (10); the first partition plate (13) consists of a first left partition plate and a first right partition plate which are respectively arranged on the inner side surfaces of the first mounting sleeve main body (11) and the second mounting sleeve main body (12); a first threading hole (131) is formed in the first partition plate (13), and the first threading hole (131) is coaxial with the mounting sleeve (10);

The first mounting sleeve main body (11) is provided with a first connecting part (161); the second mounting sleeve main body (12) is provided with a second connecting part (162); the connecting member is used for connecting the first connecting part (161) and the second connecting part (162) together.

2. The threading hole sealing device for the negative pressure device as claimed in claim 1, wherein a second partition plate (14) is further disposed on the inner side surface of the mounting sleeve (10), and the second partition plate (14) divides the inner space of the entire mounting sleeve (10) into a first accommodating space (20) and a second accommodating space (30); the first accommodating space (20) is a space between the first partition board (13) and the second partition board (14); the second partition plate (14) is provided with a second threading hole (141), and the second threading hole (141) is coaxial with the first threading hole (131) and the mounting sleeve (10).

3. The threading hole sealing device for the negative pressure device according to claim 1 or 2, wherein a third partition plate (18) is arranged at the bottom of the inner side surface of the mounting sleeve (10), a third threading hole is arranged on the third partition plate (18), and the third threading hole is coaxial with the first threading hole (131) and the mounting sleeve (10).

4. The threading hole sealing device for the negative pressure device according to claim 3, characterized in that the first partition plate (13) and the third partition plate (18) are detachably arranged on the inner side surface of the mounting sleeve (10).

5. The threading hole sealing device for the negative pressure device according to claim 4, characterized in that the diameter of the top end of the mounting sleeve (10) is smaller than the diameter of the bottom end, and the diameter of the top end of the mounting sleeve (10) is smaller than the diameter of the reserved threading hole (3) of the negative pressure device.

6. A threaded hole sealing device for a negative pressure device according to claim 1 or 2, characterized in that the inner space of the mounting sleeve (10) is filled with sealing plugging mud.

7. The threading hole sealing device for a negative pressure device according to claim 2, wherein a first sealing plugging mud (5) is filled in the first accommodating space (20), and a second sealing plugging mud (6) is filled in the second accommodating space (30); the viscosity of the first sealing plugging mud (5) is higher than that of the second sealing plugging mud (6).

8. A method for sealing a threading hole of a negative pressure device, which is performed by using the threading hole sealing device for the negative pressure device according to any one of claims 1 to 5, comprising the steps of:

S10, filling sealing plugging mud into the inner accommodating spaces of the first mounting sleeve main body (11) and the second mounting sleeve main body (12);

s20, placing the cable in the first threading hole (131) and the second threading hole (141), closing the first mounting sleeve main body (11) and the second mounting sleeve main body (12) and pressing tightly;

s30, tightly connecting the first connecting part (161) and the second connecting part (162) together by a connecting piece;

s40, pushing the top end of the mounting sleeve (10) into a reserved threading hole (3) of the vacuum device.

9. The method for sealing a threading hole for a negative pressure device according to claim 8, wherein when a second partition plate (14) is provided on the mounting sleeve (10), the second partition plate (14) divides an inner space of the entire mounting sleeve (10) into a first accommodation space (20) and a second accommodation space (30); in step S10, a first sealing plugging mud (5) is put into the first housing space (20), a second sealing plugging mud (6) is put into the second housing space (30), and the viscosity of the first sealing plugging mud (5) is higher than the viscosity of the second sealing plugging mud (6).

10. The method for sealing a string hole of a negative pressure device as claimed in claim 9, wherein a first partition (13) and a second partition (14) are installed on an inner sidewall of the installation sleeve (10) before performing step S10.

Technical Field

The invention relates to the technical field of wind tunnel tests, in particular to a threading hole sealing device and a threading hole sealing method for a negative pressure device.

Background

The wind tunnel test is an aerodynamic experiment method for arranging an aircraft or other object model in a wind tunnel, researching gas flow and interaction between the gas flow and the model and knowing the aerodynamic characteristics of the actual aircraft or other objects.

The wind tunnel is provided with a plurality of reserved threading holes for laying devices for measurement, power, illumination cooling, lubrication and the like inside and outside the tunnel body, cables or pipelines need to be connected through the threading holes, the tunnel body is ensured to have good tightness when a low-density test is carried out, and no pressure difference inside and outside the tunnel is ensured as much as possible when the low-density test is not carried out. Practice shows that the main parts of the wind tunnel for gas leakage in the low-density test process are a threading hole and a drainage pipeline, the drainage pipeline can be sealed through a control valve, the problem of tightness of the threading hole is that no universal sealing device exists at present, and the threading hole is often plugged by adopting plugging mud, but the sealing method has poor tightness and poor stability.

How to improve the sealing performance of threading holes of negative pressure devices such as vacuum wind tunnels and design a universal sealing device is a technical problem which needs to be solved urgently in the field.

Disclosure of Invention

The invention aims to provide a threading hole sealing device and a threading hole sealing method for a negative pressure device, which can meet the sealing requirements of negative pressure devices such as a vacuum wind tunnel and can become a universal sealing device.

A threading hole sealing device for a negative pressure device is characterized by comprising an installation sleeve and a connecting piece;

the mounting sleeve is of a hollow round table structure and comprises a first mounting sleeve main body and a second mounting sleeve main body which are symmetrically arranged, and the first mounting sleeve main body and the second mounting sleeve main body are hinged;

a first partition plate is arranged on the inner side of the mounting sleeve; the first partition plate consists of a first left partition plate and a first right partition plate which are respectively arranged on the inner side surfaces of the first mounting sleeve main body and the second mounting sleeve main body; a first threading hole is formed in the first partition plate and is coaxial with the mounting sleeve;

the first mounting sleeve main body is provided with a first connecting part; the second mounting sleeve main body is provided with a second connecting part; the connecting piece is used for connecting the first connecting part and the second connecting part together.

Furthermore, a second partition board is further arranged on the inner side surface of the mounting sleeve, and the second partition board divides the inner space of the whole mounting sleeve into a first accommodating space and a second accommodating space; the first accommodating space is a space between the first partition plate and the second partition plate; and a second threading hole is formed in the second partition plate, and the second threading hole is coaxial with the first threading hole and the mounting sleeve.

Furthermore, a third partition plate is arranged at the bottom of the inner side face of the installation sleeve, a third threading hole is formed in the third partition plate, and the third threading hole is coaxial with the first threading hole and the installation sleeve.

Furthermore, the first partition plate, the second partition plate and the third partition plate are detachably arranged on the inner side surface of the mounting sleeve.

Furthermore, the diameter of the top end of the mounting sleeve is smaller than that of the bottom end of the mounting sleeve, and the diameter of the top end of the mounting sleeve is smaller than that of a reserved threading hole of the negative pressure device.

Further, the inner space of the mounting sleeve is filled with sealing plugging mud.

Further, first sealing plugging mud is filled in the first accommodating space, and second sealing plugging mud is filled in the second accommodating space; the viscosity of the first sealing plugging mud is higher than that of the second sealing plugging mud.

A method for sealing a threading hole of a negative pressure device is characterized in that the threading hole sealing device for the negative pressure device is adopted for sealing, and comprises the following steps:

s10, filling sealing plugging mud into the inner accommodating spaces of the first mounting sleeve main body and the second mounting sleeve main body;

S20, placing the cable in the first threading hole and the second threading hole, closing the first mounting sleeve main body and the second mounting sleeve main body and pressing tightly;

s30, tightly connecting the first connecting part and the second connecting part together by a connecting piece;

and S40, pushing the top end of the mounting sleeve into a reserved threading hole of the negative pressure device.

Further, when a second partition plate is arranged on the mounting sleeve, the second partition plate divides the inner space of the whole mounting sleeve into a first accommodating space and a second accommodating space; in step S10, a first sealing plugging mud is put into the first accommodating space, and a second sealing plugging mud is put into the second accommodating space, and the viscosity of the first sealing plugging mud is higher than that of the second sealing plugging mud.

Further, before performing step S10, a first partition, a second partition, and a third partition are installed on an inner sidewall of the installation sleeve.

Compared with the prior art, the threading hole sealing device and the threading hole sealing method for the negative pressure device have the following beneficial effects that:

1. by adopting the sealing device, the device can be installed on the basis of not dismounting the cable or the pipeline, and the installation is convenient and simple for the test process;

2. According to the sealing device, the partition plate in the sealing device can be detached, so that the partition plate can be selected and replaced according to the size of a cable to be passed through, and the applicability of the sealing device is larger;

3. the mounting sleeve of the sealing device is of a circular truncated cone structure, the diameter of the small end of the mounting sleeve is smaller than that of the reserved threading hole, the small end of the mounting sleeve is pushed into the reserved threading hole, and in the test process, along with the increase of negative pressure devices such as negative pressure in a wind tunnel, the sealing performance of the device is improved, so that the sealing device is very suitable for sealing the threading hole of the negative pressure devices such as the wind tunnel test;

4. the sealing device has the advantages that the sealing plugging mud is filled in the inner space of the mounting sleeve, has plasticity, and realizes sealing inside the mounting sleeve and between the mounting sleeve and the cable; the first partition plate is arranged at the top end of the mounting sleeve, so that negative pressure in the negative pressure device is prevented from sucking sealing blocking mud into the negative pressure device or the inside of a wind tunnel test section to cause adverse effects on equipment or a test in the test process;

5. the sealing device is suitable for sealing large and small reserved threading pipelines in negative pressure devices such as wind tunnel tests, and is high in universality, simple in sealing method and good in sealing effect.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of a threading hole sealing device for a negative pressure device according to embodiment 1 of the present invention;

FIG. 2 is a schematic structural view of a threading hole sealing device for a negative pressure device according to embodiment 2 of the present invention;

FIG. 3 is a schematic view showing the installation structure of a threading hole sealing device for a negative pressure device according to embodiments 1 and 2 of the present invention;

fig. 4 is a flowchart of a method for sealing a string hole of a negative pressure device according to embodiment 3 of the present invention.

In the figure, 1-a sealing device, 10-an installation sleeve, 11-a first installation sleeve body, 12-a second installation sleeve body, 13-a first partition plate, 131-a first threading hole, 14-a second partition plate, 141-a second threading hole, 15-a hinge, 161-a first connecting part, 162-a second connecting part, 17-a connecting hole, 18-a third partition plate, 20-a first accommodating space, 30-a second accommodating space, 2-a wind tunnel body, 3-a reserved threading hole, 4-a cable, 5-first sealing blocking mud and 6-second sealing blocking mud.

Detailed Description

The following description provides many different embodiments, or examples, for implementing different features of the invention. The particular examples set forth below are illustrative only and are not intended to be limiting.

In the embodiment of the present invention, the negative pressure device is a vacuum wind tunnel, but those skilled in the art can understand that the sealing device of the present invention may be applied to a device having an internal negative pressure like a vacuum wind tunnel, and the application field (the field of vacuum wind tunnels) in the embodiment of the present invention is not limited to the present invention.

Example 1

Embodiment 1 provides a threading hole sealing device for a vacuum wind tunnel, as shown in fig. 1, comprising a mounting sleeve 10 and a connecting member (not shown in the figure); the mounting sleeve 10 is of a hollow circular truncated cone structure and comprises a first mounting sleeve main body 11 and a second mounting sleeve main body 12 which are symmetrically arranged, and the first mounting sleeve main body 11 is hinged with the second mounting sleeve main body 12; a first partition plate 13 is arranged on the inner side of the mounting sleeve 10; the first partition plate 13 is composed of a first left partition plate and a first right partition plate which are respectively arranged on the inner side surfaces of the first mounting sleeve main body 11 and the second mounting sleeve main body 12; a first threading hole 131 is formed in the first partition plate 13, and the first threading hole 131 is coaxial with the mounting sleeve 10; the first mounting sleeve main body 11 is provided with a first connecting part 161; the second mounting sleeve main body 12 is provided with a second connecting part 162; the connecting member is used to connect the first connecting portion 161 and the second connecting portion 162 together.

It should be noted that the circular truncated cone structure, i.e. the structure with a part of the top removed, and the symmetrical arrangement of the first mounting sleeve main body and the second mounting sleeve main body means that the first mounting sleeve main body and the second mounting sleeve main body are arranged symmetrically along the rotation axis of the rotational connection therebetween, and it can also be understood that the first mounting sleeve main body and the second mounting sleeve main body are symmetrical along the central axis when they are closed.

The first partition plate 13 is disposed at a suitable position in the mounting sleeve 10, such as the top end, the middle part, and the position behind the middle part, and is disposed for blocking the sealing blocking mud filled in the mounting sleeve and preventing the sealing blocking mud from being sucked into the vacuum wind tunnel under the action of negative pressure in the vacuum wind tunnel. That is, the first partition plate may be disposed at any suitable position in the installation sleeve 10 in this embodiment, where the suitable position is such that the first partition plate can partition the internal space of the installation sleeve into a suitable space, and the filled sealing blocking mud can seal the inside of the sealing device.

Preferably, the first partition 13 is disposed on an inner side surface of a top end of the mounting sleeve 10, the top end refers to a small end of the circular truncated cone structure, i.e. the end with a small diameter, and similarly, the bottom end of the mounting sleeve 10 refers to a large end of the circular truncated cone structure, i.e. the end with a large diameter.

The first partition plate 10 is divided into a left partition plate and a right partition plate, which are respectively arranged on the inner wall sides of the first installation sleeve main body and the second installation sleeve main body, the left partition plate and the right partition plate have the same structure and are combined to form a complete ring, and the central circular hole is the first threading hole.

First installation cover main part 11 and second installation cover main part 12 are articulated, make first installation cover main part 11 and second installation cover main part 12 can the relative rotation, realize opening and shutting of installation cover, make sealing device when sealed to the perforation hole, can open the installation cover earlier, make first installation cover main part and second installation cover main part relative rotation promptly, expose the inner space, directly put into the installation cover with the cable inside, fold first installation cover main part and second installation cover main part again, thereby realize just can installing this sealing device on the basis of not dismouting cable or pipeline in the test process.

While the hinge structure in this embodiment can be implemented by various hinge structures commonly used in the art, such as a hinge, etc., the specific arrangement of the hinge structure is not limited to the present invention, as long as the structure can implement the relative rotation between the first mounting sleeve main body and the second mounting sleeve main body.

Preferably, a third partition plate 18 (not shown in the figure) is further disposed at the bottom of the inner side surface of the mounting sleeve 10, and a third threading hole is disposed on the third partition plate 18, and is coaxial with the first threading hole 131 and the mounting sleeve 10.

It is worth mentioning that the diameters of the first threading hole and the third threading hole are matched with the diameter of the cable to be threaded. Therefore, in order to expand the application range of the sealing device, the first partition plate and the third partition plate are arranged into detachable structures, so that the applicable partition plates can be conveniently replaced according to cables with different diameters. Those skilled in the art can understand that the detachable connection structure of the first partition board, the third partition board and the inner wall of the mounting sleeve can be various, for example, a groove is formed in the inner wall of the mounting sleeve, i.e., the groove is recessed into the side wall of the mounting sleeve, or a sliding groove is formed in the inner wall of the mounting sleeve, and the sliding groove protrudes out of the inner wall of the mounting sleeve, so that the partition board can slide in the groove or the sliding groove for mounting, and such a structure belongs to a conventional structure in the field and is not described herein again.

In order to enable the sealing device to be adaptive to the threading holes of the vacuum wind tunnel, the diameter of the top end of the mounting sleeve of the sealing device needs to be smaller than the threading holes reserved in the wind tunnel, so that under the negative pressure condition of the wind tunnel, the sealing effect of the sealing device cannot be reduced along with the increase of the negative pressure, and the sealing effect is enhanced along with the increase of the negative pressure.

During the use, need be full of in the inner space of installing cover 10 and use stifled mud for sealing, pack the stifled mud for sealing promptly in the inner space between first baffle 13 and third baffle to fill up sealing device's inner space, play fine sealed effect. The biggest effect of first baffle is spacing stifled mud, avoids in the experiment, and the negative pressure is inside inhaling it to the wind-tunnel.

The sealing plugging mud used in the embodiment is colloid with relatively high viscosity, such as 30# vacuum plugging mud, 80# vacuum plugging mud and the like, and because the sealing plugging mud is in a colloid form, the sealing plugging mud has good sealing performance after being compressed and has relatively high static friction with the cable, the sealing performance of the sealing device is improved during testing, and the cable cannot slide in the device.

In addition, as shown in fig. 1, the first connecting portion 161 and the second connecting portion 162 are connected by a connecting member, and may be connected by a conventional connecting member such as a bolt and a screw, and a nut and a gasket are provided as necessary, so as to tightly connect the first mounting sleeve body and the second mounting sleeve body, and prevent air leakage from occurring at the first mounting sleeve body and the second mounting sleeve body under the action of sealing mud.

Example 2

The embodiment also provides a threading hole sealing device for a vacuum wind tunnel, which is different from the embodiment 1 in that a second partition plate 14 is further arranged in the mounting sleeve of the sealing device 1 in the embodiment, as shown in fig. 2.

In this embodiment, a second partition plate 14 is further disposed on an inner side surface of the mounting sleeve 10, and the second partition plate 14 divides an inner space of the entire mounting sleeve 10 into a first accommodating space 20 and a second accommodating space 30; the first accommodating space 20 is a space between the first partition plate 13 and the second partition plate 14; the other part is a second accommodating space; the second partition 14 is provided with a second threading hole 141, and the second threading hole 141 is coaxial with the first threading hole 131 and the mounting sleeve 10.

In the present embodiment, the mounting position of the second partition 14 is a position on the inner surface of the mounting sleeve 10 that is lower than the first partition, and the inner space of the mounting sleeve 10 may be divided into two arbitrary positions. Those skilled in the art can understand that the second partition plate in this embodiment is disposed on the inner wall of the mounting sleeve, and like the first partition plate, the second partition plate is also divided into a left partition plate and a right partition plate, that is, a second left partition plate and a second right partition plate, which are respectively disposed on the inner walls of the first mounting sleeve body and the second mounting sleeve body, when the first mounting sleeve body and the second mounting sleeve body are closed, the second left partition plate and the second right partition plate enclose a complete ring, and the central circular hole is the second threading hole. The second threading hole 141, the first threading hole 131 and the mounting sleeve 10 are coaxially arranged, so that the cable is protected from being damaged under the action of force to the maximum extent.

When in use, the first accommodating space 20 is filled with first sealing plugging mud 5, and the second accommodating space 30 is filled with second sealing plugging mud 6; the viscosity of the first sealing plugging mud 5 is higher than that of the second sealing plugging mud 6. Therefore, the sealing blocking mud in the first accommodating space with the small caliber is set to be elastic sealing material with higher viscosity, so that the static friction force of the device and the cable is increased, and the cable is prevented from moving due to negative pressure; the sealing blocking mud in the second accommodating space with the larger caliber is set to be blocking mud with better fluidity, so that the existing gap is strictly sealed, and the strict sealing performance is ensured.

Example 3

The embodiment provides a method for sealing a threading hole of a vacuum wind tunnel, which adopts the sealing device in embodiment 1 to seal, and the flow of the specific sealing method is shown in fig. 4.

S10, filling sealing plugging mud into the inner accommodating spaces of the first mounting sleeve main body 11 and the second mounting sleeve main body 12;

in this embodiment, the sealing plugging mud is filled into the accommodating space defined by the side wall between the first left partition plate and the bottom end of the first mounting sleeve main body 11 and the accommodating space defined by the side wall between the first right partition plate and the bottom end of the second mounting sleeve main body 12;

The first mounting sleeve main body 11 and the second mounting sleeve main body 12 of the sealing device 10 are rotationally separated to expose the accommodating space inside the first mounting sleeve main body 11 and the second mounting sleeve main body 12, and sealing plugging mud is filled into the accommodating space enclosed by the side wall between the first left partition plate and the bottom end of the first mounting sleeve main body 11 and the accommodating space enclosed by the side wall between the first right partition plate and the bottom end of the second mounting sleeve main body 12; that is to say, the first partition plate divides the inner space of the mounting sleeve into two parts, one part is a space surrounded by the side wall between the first partition plate and the top end of the mounting sleeve, and the other part is a space surrounded by the side wall between the first partition plate and the bottom end of the mounting sleeve. In the accommodation space that the lateral wall enclosed between the bottom that will seal with stifled mud packing into first baffle and installation cover, when using, the threading hole of reservation is stretched into on the top of installation cover, during vacuum wind-tunnel negative pressure state, sealed with stifled mud can not be inhaled in the vacuum wind-tunnel under the effect of blockking of first baffle to along with the increase of negative pressure, because the round platform structure of installation cover, first baffle can not be to the displacement of the less front end of sectional area, make the stability of structure higher.

Of course, in the process of filling the sealing blocking mud, the existence of air holes is avoided, so that the sealing effect is improved.

Preferably, before filling the plugging mud, selecting a proper first partition plate and/or a proper third partition plate according to the size of the cable to be sealed, installing the first partition plate and the third partition plate on the inner part of the installation sleeve, and then filling the plugging mud for sealing; the proper condition is that the diameters of the threading holes on the first partition board and the third partition board are matched with the size of the cable, and a person skilled in the art can understand that the diameters of the threading holes on the first partition board and the third partition board are slightly larger than the diameter of the cable;

s20, placing the cable in the first threading hole 131 and the second threading hole 141, closing the first mounting sleeve main body 11 and the second mounting sleeve main body 12 and pressing tightly;

directly putting the cable between a first mounting sleeve main body 11 and a second mounting sleeve main body 12 which are separated in a rotating mode, in actual operation, directly putting the cable in a threading hole of the first mounting sleeve main body or directly putting the cable in a threading hole of the second mounting sleeve main body, and directly closing and pressing the first mounting sleeve main body and the second mounting sleeve main body after the cables are placed;

s30, tightly connecting the first connection part 161 and the second connection part 162 by using a connecting piece;

As described in embodiment 1, the first mounting sleeve body and the second mounting sleeve body can be connected together by using a connecting member such as a screw bolt, specifically, the first connecting portion 161 and the second connecting portion 162 are both provided with a connecting hole 17, and the connecting member passes through the connecting hole to connect the two connecting portions;

and S40, pushing the top end of the mounting sleeve 10 into a reserved threading hole 3 of the vacuum wind tunnel, and clamping.

As shown in fig. 3, a threading hole 3 is reserved on the tunnel body 2 of the vacuum wind tunnel, and the top end of the sealing device assembled in the steps S10-S30 is pushed into the reserved threading hole 3; during the test, the negative pressure of the vacuum wind tunnel can provide a suction force to the inside of the vacuum wind tunnel for the sealing device tightly supports the port of the reserved threading hole, and along with the increase of the negative pressure (namely the increase of the absolute value of the pressure value), the sealing performance between the sealing device and the reserved threading hole is stronger. Meanwhile, due to the effect of the sealing mud blocking, the sealing is completed inside the sealing device and between the sealing device and the cable.

Example 4

The embodiment provides a method for sealing a threading hole of a vacuum wind tunnel, which is different from embodiment 3, in the embodiment, the sealing device of embodiment 2 is used for sealing, that is, the mounting sleeve 10 is provided with the second partition plate 14, the second partition plate 14 divides the inner space of the whole mounting sleeve 10 into the first accommodating space 20 and the second accommodating space 30, the first accommodating space is a space between the first partition plate and the second partition plate, the second accommodating space is a space between the second partition plate and the third partition plate, and the flow of the specific sealing method is also shown in fig. 4.

S10, filling sealing plugging mud into the inner accommodating spaces of the first mounting sleeve main body 11 and the second mounting sleeve main body 12;

in this embodiment, the first accommodation space 20 and the second accommodation space 30 are filled with sealing plugging mud;

rotationally separating a first mounting sleeve main body 11 and a second mounting sleeve main body 12 of the sealing device 10 to expose an inner accommodating space, and filling sealing plugging mud into the inner accommodating space;

preferably, before filling the plugging mud, selecting a first partition plate, a second partition plate and a third partition plate which are suitable according to the size of a cable to be sealed, installing the first partition plate, the second partition plate and the third partition plate on the inner part of the installation sleeve, and then filling the plugging mud for sealing;

for the sealing blocking mud, the same kind of blocking mud may be filled in the first accommodating space 20 and the second accommodating space 30, or different kinds of blocking mud may be filled in the first accommodating space and the second accommodating space.

Preferably, the first sealing plugging mud 5 is filled in the first accommodating space 20, and the second sealing plugging mud 6 is filled in the second accommodating space 30; the viscosity of the first sealing plugging mud 5 is higher than that of the second sealing plugging mud 6. Therefore, the sealing blocking mud in the first accommodating space with the small caliber is set to be elastic sealing material with higher hardness, so that the static friction force of the device and the cable is increased, and the cable is prevented from moving due to negative pressure; the sealing blocking mud in the second accommodating space with the larger caliber is set into the blocking mud with better fluidity, so that the existing gap is strictly sealed, and the strict sealing performance is ensured.

S20, placing the cable in the first threading hole 131 and the second threading hole 141, closing the first mounting sleeve main body 11 and the second mounting sleeve main body 12 and pressing tightly;

s30, tightly connecting the first connection part 161 and the second connection part 162 by using a connecting piece;

and S40, pushing the top end of the mounting sleeve 10 into a reserved threading hole 3 of the vacuum wind tunnel, and clamping.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.