CN212274213U - Coaxial air pipe and isolation system - Google Patents

Abstract

The utility model provides a coaxial tuber pipe and isolated system relates to ventilation pipe technical field. The coaxial air pipe comprises an outer air pipe, an inner air pipe and an air pipe framework, the air pipe framework is formed by winding springs with variable diameters at equal pitches, so that the outer diameter of the air pipe framework is changed at equal pitches, the outer air pipe is sleeved outside the inner air pipe, a first air channel is formed in the inner air pipe, a second air channel is formed between the outer air pipe and the inner air pipe and between the outer air pipe and the inner air pipe, and therefore the air pipe can simultaneously realize two functions of the air inlet pipe and the air outlet pipe, on one hand, the air outlet pipe and the air inlet pipe are integrated, so that the installation and the disassembly of pipelines are convenient and quick, the working strength of workers is reduced, meanwhile, the whole assembly using space is tidier due to the single outer pipeline, the use and the placement of other equipment are convenient, on the other hand, one pipeline is butted with one air port, so that the isolation cabin body only, the integrity of the isolation capsule is ensured.

Description

Coaxial air pipe and isolation system

Technical Field

The utility model relates to a ventilation pipe technical field especially relates to a coaxial tuber pipe and isolated system.

Background

Isolation spaces such as isolation cabins for isolation use are widely put into use, the ventilation of isolation cabins generally adopts the isolation cabins and is realized with the external air exchange pipeline between the air exchange purification device with the active carbon purification function, the air exchange pipeline of the existing isolation cabins needs to separately provide an air outlet and an air inlet on the isolation cabins, and two separate pipelines are needed to be respectively connected on the isolation cabins as an air outlet pipeline and an air inlet pipeline, so that the external pipelines of the whole isolation cabins are too many, the isolation cabins are not attractive, the external equipment of the isolation cabins is influenced to be placed, and meanwhile, the production and installation costs are also increased by the multiple pipelines.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the utility model provides a coaxial tuber pipe and isolated system, main aim at integrated play tuber pipe and air-supply line for installation, dismantlement pipeline are convenient, swift, reduce staff's working strength, and whole assembly usage space is cleaner and tidier, makes things convenient for the use of other equipment and places, docks a wind gap, makes the isolation cabin body only need open a wind gap, has guaranteed the integrality of isolation cabin, thereby is suitable for the practicality more.

In order to achieve the above object, the embodiment of the present invention mainly provides the following technical solutions:

an embodiment of the utility model provides a coaxial tuber pipe, include:

an outer air duct;

the inner air pipe is internally provided with a first air channel;

the air pipe framework is supported between the outer air pipe and the inner air pipe, and a second air channel is formed between the outer wall of the inner air pipe and the inner wall of the outer air pipe; wherein

The air pipe framework is formed by winding springs with equal pitch and variable diameter, so that the outer diameter of the air pipe framework is changed with equal pitch.

Preferably, in the above coaxial duct, the spring with a variable pitch comprises at least one group of single winding groups, and the single winding group comprises: the spring wire comprises a first spring wire and a second spring wire, wherein the first spring wire and the second spring wire are wound at the same starting point, the same pitch reducing, the opposite winding directions, the same extending direction and the same terminal point.

Preferably, in the coaxial air duct, the spring with the same pitch and variable diameter comprises a plurality of groups of single winding groups, and the plurality of groups of single winding groups are uniformly and rotationally distributed on the central axis of the air duct framework.

Preferably, in the coaxial air duct, at the ith pitch position of the air duct framework, the outer diameter of the air duct framework is a first size;

the (i + 1) th pitch position of tuber pipe skeleton, the external diameter of tuber pipe skeleton is the second size, the second size is greater than first size, wherein, i is more than or equal to 1's positive integer.

Preferably, in the coaxial air duct, the inner air duct is supported by the ith pitch position of the air duct framework, and the outer air duct is supported by the (i + 1) th pitch position.

Preferably, in the above coaxial air duct, the air duct further comprises an air duct end, and the air duct end comprises:

the first end of the outer supporting pipe is connected with an outer air pipe, the second end of the outer supporting pipe is provided with an outer connecting disc, and the outer connecting disc protrudes out of the periphery of the outer supporting pipe;

the first end of the inner supporting pipe is connected with the inner supporting pipe, the second end of the inner supporting pipe is provided with an inner connecting disc, and the inner connecting disc protrudes out of the periphery of the inner supporting pipe;

and the support frame is supported between the outer support tube and the inner support tube.

Preferably, in the coaxial air pipe, a first air duct of the end of the air pipe is formed in the inner supporting pipe, and the first air duct of the end of the air pipe is communicated with the first air duct;

and a second air channel of the air pipe end is formed between the inner wall of the outer supporting pipe and the outer wall of the inner supporting pipe, and the second air channel of the air pipe end is communicated with the second air channel.

Preferably, in the coaxial air duct, the support frame is formed by a plurality of support bars around the periphery of the inner support tube.

Preferably, in the coaxial air duct, the air cross-sectional area of the first air duct of the air duct end is the same as that of the second air duct of the air duct end.

Additionally, an embodiment of the present invention provides an isolation system, including:

the cabin body is provided with a ventilation port on the cabin wall;

a coaxial air duct;

the air extracting and purifying device is arranged outside the cabin body and is used for extracting air and purifying the gas in the cabin body;

the first end of the coaxial air pipe is communicated with the air exchange port, and the second end of the coaxial air pipe is communicated with the air extraction and purification device.

Borrow by above-mentioned technical scheme, the utility model discloses coaxial tuber pipe that technical scheme provided has following advantage at least:

the utility model provides a coaxial air pipe, which comprises an outer air pipe, an inner air pipe and an air pipe framework, wherein a first air channel is formed in the inner air pipe; the air pipe framework is supported between the outer air pipe and the inner air pipe, and a second air channel is formed between the outer wall of the inner air pipe and the inner wall of the outer air pipe; wherein the air duct framework is formed by winding springs with equal pitch and diameter changing so as to lead the outer diameter of the air duct framework to be changed with equal pitch, the outer air duct is sleeved outside the inner air duct, a first air channel is formed in the inner air pipe, and because the air pipe framework is supported between the outer air pipe and the inner air pipe, a second air channel is formed between the outer wall of the inner air duct pipeline and the inner wall of the outer air duct pipeline, so that two functions of an air inlet pipe and an air outlet pipe can be simultaneously realized by one air duct, on one hand, the air outlet pipe and the air inlet pipe are integrated, the pipeline is convenient and quick to mount and dismount, the working strength of workers is reduced, meanwhile, the whole assembly using space is tidier due to the fact that the external pipeline is single, use and placement of other equipment are facilitated, on the other hand, one pipeline is in butt joint with one air port, the isolation cabin body only needs to be provided with one air port, and integrity of the isolation cabin is guaranteed. Because the isolated system has the beneficial effect of above-mentioned analysis, so the embodiment of the utility model provides an isolated system can solve prior art isolated system and trade wind and need set up a plurality of holes on the isolation capsule and dock air-out pipeline and intake stack, consequently makes the isolation capsule body only need open an wind gap, has guaranteed the integrality of isolation capsule.

The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the embodiments of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a cross-sectional view of a coaxial air duct according to an embodiment of the present invention;

fig. 2 is a structural diagram of a duct framework of a coaxial duct according to an embodiment of the present invention;

fig. 3 is a first view structural diagram of an air duct framework of a coaxial air duct according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of an air hose end;

fig. 5 is a schematic structural view of the air duct tip.

The reference numerals in fig. 1 to 5 include:

10-inner air pipe, 11-first air duct, 20-outer air pipe, 21-second air duct, 30-air pipe framework, 40-air pipe end, 41-outer supporting pipe, 42-inner supporting pipe, 43-supporting frame, 44-outer connecting disc, 45-inner connecting disc, 46-first air duct of air pipe end and 47-second air duct of air pipe end.

Detailed Description

The utility model discloses a what solve among the prior art isolation cabin trades the wind pipeline need set up air outlet and air intake alone on the isolation cabin, and needs two solitary pipelines to connect respectively on the isolation cabin as air-out pipeline and air-supply line, leads to whole isolation cabin outside pipeline too many, is unfavorable for pleasing to the eye, influences the outside equipment of isolation cabin and places, and simultaneously, many pipelines have also increased production and installation cost's problem, provide a coaxial tuber pipe and isolated system.

Further, the technical means and effects of the present invention for achieving the objects of the embodiments of the present invention will be described in detail below with reference to the accompanying drawings and the preferred embodiments, in which the specific embodiments, structures, features and effects of the coaxial wind pipe according to the embodiments of the present invention are described in detail. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, with the specific understanding that: both a and B may be included, a may be present alone, or B may be present alone, and any of the three cases can be provided.

The coaxial tuber pipe and the isolated system that this embodiment provided can avoid making the installation, dismantling the pipeline complicated, improve staff's working strength's problem owing to the installation ventilation pipeline is too many, and simultaneously, the outside pipeline is single makes whole assembly usage space cleaner and tidier, makes things convenient for the use and the placing of other equipment, convenient to use.

Example one

Fig. 1 to 5 show an embodiment of a coaxial air duct according to the present invention.

As shown in fig. 1 to 5, the utility model provides a coaxial air pipe, include: the air duct structure comprises an outer air duct 20, an inner air duct 10 and an air duct framework 30, wherein a first air duct 11 is formed in the inner air duct 10; the air duct framework 30 is supported between the outer air duct 20 and the inner air duct 10, and a second air duct 21 is formed between the outer wall of the inner air duct 10 and the inner wall of the outer air duct 20; the air duct framework 30 is formed by winding springs with equal pitch and variable diameter, so that the outer diameter of the air duct framework 30 is changed with equal pitch.

In a specific implementation, the air duct framework 30 may be made of an elastic material, such as a spring steel wire or a stainless steel newly formed, and since the elastic material has elastic deformation, it is ensured that the air duct framework can be compressed and elongated, on one hand, the air duct framework is convenient to transport after being compressed, and on the other hand, the air duct framework can be adjusted in length according to needs.

Specifically, the outer air duct 20 is sleeved outside the inner air duct 10, a first air duct 11 is formed in the inner air duct 10, and a second air duct 21 is formed between the outer wall of the inner air duct 10 and the inner wall of the outer air duct 20 due to the fact that the air duct framework 30 is supported between the outer air duct 20 and the inner air duct 10, wherein the first air duct of the inner air duct 10 is used for return air, the first air duct forms a negative pressure air duct, the second air duct 21 between the outer wall of the inner air duct 10 and the inner wall of the outer air duct 20 is used for air supply, and the second air duct forms positive pressure air duct. In the prior art, a single-pipeline negative-pressure air return pipeline is adopted, and after the outer wall of the single-pipeline negative-pressure air return pipeline is damaged, external pollutant gas can enter the negative-pressure air return pipeline through a damaged opening. And the coaxial tuber pipe of this embodiment adopts the setting of double-deck pipeline, even there is slight damage to outer tuber pipe pipeline wall to reveal, owing to receive the protection in the second wind channel of malleation, in the unable entering second wind channel of external gas to make the outside gaseous pollutants of outer tuber pipe can not reveal to the first wind path of negative pressure.

The setting of coaxial tuber pipe has guaranteed that an tuber pipe can realize simultaneously the air-supply line and go out two kinds of functions of tuber pipe, on the one hand, it goes out tuber pipe and air-supply line to have integrateed, make the installation, it is convenient, swift to dismantle the pipeline, reduce staff's working strength, outside pipeline is single simultaneously makes whole assembly usage space cleaner and tidier, make things convenient for the use of other equipment and place, on the other hand, a pipeline docks a wind gap, make the isolation cabin body only need open a wind gap, the integrality of isolation cabin has been guaranteed.

In a specific implementation, as shown in fig. 1 to 5, the spring with a variable diameter at equal pitch includes at least one set of single winding groups, where the single winding group includes: the spring wire comprises a first spring wire and a second spring wire, wherein the first spring wire and the second spring wire are wound at the same starting point, the same pitch reducing, the opposite winding directions, the same extending direction and the same terminal point.

Specifically, first spring wire and second spring wire in at least a set of monomer winding group are with same initial point, the same pitch reducing, opposite winding direction, same extending direction, same terminal point winding, it can form two basic vertical nested cylinder skeleton cavities to have guaranteed that a set of monomer winding group, and is further, the cylinder skeleton cavity that the minimum footpath of reducing formed is used for bearing interior tuber pipe 10, the outer cylinder skeleton that the maximum footpath of reducing formed is used for supporting inside outer tuber pipe 20, outer tuber pipe 20 and interior tuber pipe 10 have been supported, and then provide the holding power for forming two wind channels, the smoothness of ventilation has been guaranteed.

In the specific implementation shown in fig. 1 to 5, the spring with the variable diameter at equal pitch includes a plurality of winding groups, and the winding groups are uniformly and rotationally distributed on the central axis of the air duct frame 30.

Specifically, the spring of pitch reducing includes multiunit winding group, has promoted the support capacity who supports outer tuber pipe 20 and interior tuber pipe 10, on the one hand, avoids because the tuber pipe that outer tuber pipe 20 and interior tuber pipe 10 quality itself lead to is flat to be out of shape too greatly, and on the other hand avoids because first wind channel 11 and second wind channel 21 are at the in-process of ventilating, and the wind channel is because the condition of the suction deformation of wind, and it is worth noting that because multiunit winding group evenly rotatory distribution in the central axis of tuber pipe skeleton 30 has guaranteed that the frame supports interior tuber pipe 10 and outer tuber pipe 20's holding power is even to avoid the local deformation of tuber pipe, influence the ventilation.

In the specific implementation shown in fig. 1 to 5, at the ith pitch position of the air duct framework 30, the outer diameter of the air duct framework 30 is a first size; the (i + 1) th pitch position of air pipe skeleton 30, the external diameter of air pipe skeleton 30 is the second size, the second size is greater than the first size, wherein, i is the positive integer more than or equal to 1.

Specifically, the external diameter that the ith pitch position of tuber pipe skeleton 30 corresponds tuber pipe skeleton 30 is first size, and the external diameter that the (i + 1) th pitch position of tuber pipe skeleton 30 corresponds tuber pipe skeleton 30 is the second size, and the second size is greater than first size has guaranteed that tuber pipe skeleton 30 is even and has appeared periodic reducing for the summit interval of the first size of external diameter is the same, and the summit interval of second size is also the same.

In the specific implementation shown in fig. 1 to 5, the inner air duct 10 and the air duct framework 30 are supported at the ith pitch position, and the outer air duct 20 and the (i + 1) th pitch position are supported.

Specifically, because the air duct skeleton 30 is even and presents periodic reducing, and the peak interval of first size is the same, when interior tuber pipe 10 supported with ith pitch position, guaranteed that the even interval of strong point meets interior tuber pipe 10, and then makes its holding power evenly distributed, and in the same way, outer tuber pipe 20 with the support of ith +1 pitch position, the peak interval of second size is also the same, has guaranteed that the even interval of strong point meets with outer tuber pipe 20, and then makes its holding power evenly distributed.

As shown in fig. 1 to 5, in an implementation, the air duct end 40 further includes:

the first end of the outer supporting pipe 41 is connected with the outer air pipe 20, the second end of the outer supporting pipe 41 is provided with an outer connecting disc 44, and the outer connecting disc 44 protrudes out of the periphery of the outer supporting pipe 41;

the inner supporting tube 42 is connected with the first end of the inner supporting tube 42, the second end of the inner supporting tube 42 is provided with an inner connecting disc 45, and the inner connecting disc 45 protrudes out of the periphery of the inner supporting tube 42;

and a support frame 43 supported between the outer support tube 41 and the inner support tube 42.

In the embodiment shown in fig. 1 to 5, a first air duct 46 of an air duct end is formed in the inner supporting tube 42, and the first air duct 46 of the air duct end is communicated with the first air duct 11;

the inner wall of the outer supporting tube 41 and the outer wall of the inner supporting tube 42 form a second air duct 47 of the air duct end, and the second air duct 47 of the air duct end is communicated with the second air duct 21.

Specifically, tuber pipe end 40 can be used for connecting the one end of coaxial tuber pipe, perhaps is used for connecting the both ends of coaxial tuber pipe, has guaranteed that coaxial tuber pipe can be with other device butt joints, and the material of tuber pipe end 40 can be non-metallic material, also can be the metal material, as long as can be used for connecting other devices as the end of coaxial tuber pipe, outer connection dish 44 and inner connection dish 45 are used for being connected with other equipment, and the connected mode can be the joint, magnetism is inhaled and is connected or threaded connection, and the connected mode includes but not limited to above-mentioned connected mode.

In the embodiment shown in fig. 1 to 5, the supporting frame 43 is formed by a plurality of supporting bars around the periphery of the inner supporting tube 42.

Specifically, the supporting frame 43 is formed by surrounding the periphery of the inner supporting tube 42 by a plurality of supporting bars, on one hand, the supporting frame 43 supports the inner supporting tube 42 and the outer supporting tube 41 to enable the inner supporting tube and the outer supporting tube to be in a butt joint with each other, so that a second air duct 47 of an air duct end head capable of being in butt joint with the second air duct 21 is formed, and on the other hand, the supporting frame also has the function of reinforcing the air duct end head 40.

In the embodiment shown in fig. 1 to 5, the first air passage 46 of the air duct tip and the second air passage 47 of the air duct tip have the same cross-sectional area.

Specifically, the cross-sectional area of the first air duct 46 at the air duct end is the same as that of the second air duct 47 at the air duct end, so that the stability of air inlet and outlet of the two air ducts is ensured.

In the specific implementation shown in fig. 1 to 5, the outer air duct 20 and the inner air duct 10 are made of flexible materials.

Specifically, the material of outer tuber pipe 20 and interior tuber pipe 10 is flexible and airtight material, can be individual layer tent cloth, plastic sheeting, fibre cloth etc. including but not limited to above-mentioned material, as long as satisfy flexible and airtight function can, also can multilayer composite material, compound heat preservation, mould proof, dampproofing, inhale the sound material etc. it is worth noting that because outer tuber pipe 20 with interior tuber pipe 10 is flexible material, can realize folding the accomodating, the compression etc. of tuber pipe according to its material characteristic, make its reuse space little, easy storage and transportation.

Example two

The utility model provides a pair of isolation system, include: the air exhaust purification device is arranged outside the cabin body and used for exhausting and purifying air in the cabin body, wherein the first end of the coaxial air pipe is communicated with the air exhaust port, and the second end of the coaxial air pipe is communicated with the air exhaust purification device.

Specifically, the cabin body can be a room such as an isolation tent, a shelter, a ward, a factory building and the like, and includes but is not limited to the form of the cabin body, the joint of the coaxial air pipe is connected to the scavenge port, and is used for butting against the end 40 of the air pipe, and simultaneously, the first air duct 46 and the second air duct 47 are guided to different directions, so that the wind of the first air duct 46 and the second air duct 47 cannot interfere with each other, meanwhile, the joint which is respectively butted against the first air duct 46 and the second air duct 47 is also connected to the air exhaust purification device, so that the air exhaust purification device is ensured, and one port realizes the functions of air exhaust and.

Specifically, the coaxial air duct in the second embodiment may directly adopt the coaxial air duct provided in the first embodiment, and the specific implementation structure may refer to the related content described in the first embodiment, which is not described herein again.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

It will be appreciated that the relevant features of the devices described above may be referred to one another. In addition, "first", "second", and the like in the above embodiments are for distinguishing the embodiments, and do not represent merits of the embodiments.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed apparatus should not be construed to reflect the intent as follows: rather, the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art will appreciate that the components of the apparatus of the embodiments may be adapted and arranged in one or more arrangements different from the embodiments. The components of the embodiments may be combined into one component and, in addition, they may be divided into a plurality of sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the components of any apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination. The various component embodiments of the present invention may be implemented in hardware, or in a combination thereof.

It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or components not listed in a claim. The word "a" or "an" preceding a component or element does not exclude the presence of a plurality of such components or elements. The present invention can be implemented with the aid of a device comprising a number of different components. In the claims enumerating several means, several of these means may be embodied by one and the same item. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims (10)

1. A coaxial ductwork, comprising:

an outer air duct;

the inner air pipe is internally provided with a first air channel;

the air pipe framework is supported between the outer air pipe and the inner air pipe, and a second air channel is formed between the outer wall of the inner air pipe and the inner wall of the outer air pipe; wherein

The air pipe framework is formed by winding springs with equal pitch and variable diameter, so that the outer diameter of the air pipe framework is changed with equal pitch.

2. Coaxial ductwork according to claim 1,

the spring with the variable diameter at the same pitch comprises at least one group of monomer winding groups, and each monomer winding group comprises: the spring wire comprises a first spring wire and a second spring wire, wherein the first spring wire and the second spring wire are wound at the same starting point, the same pitch reducing, the opposite winding directions, the same extending direction and the same terminal point.

3. Coaxial ductwork according to claim 2,

the equal-pitch reducing spring comprises a plurality of groups of single winding groups, and the plurality of groups of single winding groups are uniformly and rotatably distributed on the central axis of the air pipe framework.

4. Coaxial ductwork according to claim 2,

the air pipe framework is arranged at the ith pitch position, and the outer diameter of the air pipe framework is a first size;

the (i + 1) th pitch position of tuber pipe skeleton, the external diameter of tuber pipe skeleton is the second size, the second size is greater than first size, wherein, i is more than or equal to 1's positive integer.

5. Coaxial ductwork according to claim 4,

the inner air pipe and the ith pitch position of the air pipe skeleton are supported, and the outer air pipe and the (i + 1) th pitch position are supported.

6. The coaxial ductwork of claim 1, further comprising a ductwork head, the ductwork head comprising:

the first end of the outer supporting pipe is connected with an outer air pipe, the second end of the outer supporting pipe is provided with an outer connecting disc, and the outer connecting disc protrudes out of the periphery of the outer supporting pipe;

the first end of the inner supporting pipe is connected with the inner supporting pipe, the second end of the inner supporting pipe is provided with an inner connecting disc, and the inner connecting disc protrudes out of the periphery of the inner supporting pipe;

and the support frame is supported between the outer support tube and the inner support tube.

7. Coaxial ductwork according to claim 6,

a first air channel of the air pipe end is formed in the inner supporting pipe, and the first air channel of the air pipe end is communicated with the first air channel;

and a second air channel of the air pipe end is formed between the inner wall of the outer supporting pipe and the outer wall of the inner supporting pipe, and the second air channel of the air pipe end is communicated with the second air channel.

8. Coaxial ductwork according to claim 6,

the support frame is formed by surrounding the periphery of the inner support tube by a plurality of support bars.

9. Coaxial ductwork according to claim 7,

and the air passing sectional areas of the first air channel of the air pipe end and the second air channel of the air pipe end are the same.

10. An isolation system, comprising:

the cabin body is provided with a ventilation port on the cabin wall;

a coaxial ductwork according to any one of claims 1 to 9;

the air extracting and purifying device is arranged outside the cabin body and is used for extracting air and purifying the gas in the cabin body;

the first end of the coaxial air pipe is communicated with the air exchange port, and the second end of the coaxial air pipe is communicated with the air extraction and purification device.

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