Coaxial air duct and isolation system

Abstract

The present invention provides a coaxial air duct and isolation system, which relates to the field of ventilation duct technology. The coaxial air duct includes an outer air duct, an inner air duct and an air duct frame. The air duct frame is formed by winding a spring with equal pitch and variable diameter, so that the outer diameter of the air duct frame changes at equal pitch. The outer air duct is sleeved on the outside of the inner air duct to form a first air duct in the inner air duct. Since the air duct frame is supported between the outer air duct and the inner air duct, a second air duct is formed between the outer wall of the inner air duct and the inner wall of the outer air duct, ensuring that one air duct can simultaneously realize the two functions of the air inlet and outlet. On the one hand, the air outlet and the air inlet are integrated, making the installation and disassembly of the pipeline convenient and quick, reducing the work intensity of the staff. At the same time, the single external pipeline makes the entire assembly and use space tidier, which is convenient for the use and placement of other equipment. On the other hand, one pipeline is connected to one air outlet, so that the isolation cabin only needs to open one air outlet, ensuring the integrity of the isolation cabin.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation pipes, and in particular to a coaxial air duct and an isolation system. Background Art

[0002] Isolation spaces such as isolation cabins are widely used. Ventilation of isolation cabins is generally achieved by connecting an external air exchange duct between the isolation cabin and an air exchange purification device with activated carbon purification function. The air exchange duct of the existing isolation cabin needs to have separate air outlets and air inlets on the isolation cabin, and two separate ducts are required as air outlet ducts and air inlet ducts respectively connected to the isolation cabin, resulting in too many external pipelines in the entire isolation cabin, which is not conducive to aesthetics and affects the placement of equipment outside the isolation cabin. At the same time, multiple pipelines also increase production and installation costs. Summary of the Invention

[0003] In view of this, an embodiment of the present invention provides a coaxial air duct and isolation system, the main purpose of which is to integrate the air outlet duct and the air inlet duct, so that the installation and disassembly of the pipeline are convenient and quick, the workload of the staff is reduced, the entire assembly and use space is more tidy, and it is convenient for the use and placement of other equipment. By docking with an air outlet, only one air outlet needs to be opened in the isolation cabin, which ensures the integrity of the isolation cabin and is therefore more suitable for practical use.

[0004] To achieve the above objectives, the embodiments of the present invention mainly provide the following technical solutions:

[0005] An embodiment of the present invention provides a coaxial air duct, comprising:

[0006] External air duct;

[0007] an inner air duct, wherein a first air duct is formed in the inner air duct;

[0008] The air duct frame is supported between the outer air duct and the inner air duct, and forms a second air duct between the outer wall of the inner air duct and the inner wall of the outer air duct;

[0009] The air duct skeleton is formed by winding springs with equal pitch and variable diameter, so that the outer diameter of the air duct skeleton changes at equal pitch.

[0010] Preferably, in the above-mentioned coaxial air duct, the spring with equal pitch and variable diameter includes at least one group of single winding groups, and the single winding group includes: a first spring steel wire and a second spring wire, and the first spring steel wire and the second spring wire are wound with the same starting point, the same pitch variation, opposite winding directions, the same extension direction, and the same end point.

[0011] Preferably, in the above-mentioned coaxial air duct, the springs with equal pitch and variable diameter include multiple groups of single winding groups, and the multiple groups of single winding groups are evenly distributed in rotation on the central axis of the air duct skeleton.

[0012] Preferably, in the above-mentioned coaxial air duct, at the i-th pitch position of the air duct skeleton, the outer diameter of the air duct skeleton is a first size;

[0013] At the i+1th pitch position of the air duct skeleton, the outer diameter of the air duct skeleton is a second size, and the second size is larger than the first size, wherein i is a positive integer greater than or equal to 1.

[0014] Preferably, in the above-mentioned coaxial air duct, the inner air duct is supported at the i-th pitch position of the air duct skeleton, and the outer air duct is supported at the i+1-th pitch position.

[0015] Preferably, the above-mentioned coaxial air duct further comprises an air duct end head, and the air duct end head comprises:

[0016] An external support tube, wherein a first end of the external support tube is connected to the external air duct, and a second end of the external support tube is provided with an external connection plate, and the external connection plate protrudes from the outer periphery of the external support tube;

[0017] An inner support tube, wherein the first end of the inner support tube is connected to the inner support tube, and the second end of the inner support tube is provided with an inner connecting disk, and the inner connecting disk protrudes from the outer periphery of the inner support tube;

[0018] The support frame is supported between the outer support tube and the inner support tube.

[0019] Preferably, in the above-mentioned coaxial air duct, the first air duct of the air duct end is formed in the inner support tube, and the first air duct of the air duct end is connected with the first air duct;

[0020] The second air duct of the air duct end is formed between the inner wall of the outer support tube and the outer wall of the inner support tube, and the second air duct of the air duct end is connected with the second air duct.

[0021] Preferably, in the above-mentioned coaxial air duct, the support frame is formed by a plurality of support bars surrounding the outer circumference of the inner support tube.

[0022] Preferably, in the above-mentioned coaxial air duct, the first air duct at the air duct end and the second air duct at the air duct end have the same air flow cross-sectional area.

[0023] In addition, an embodiment of the present invention provides an isolation system, comprising:

[0024] A cabin, wherein a bulkhead of the cabin is provided with a ventilation port;

[0025] Coaxial duct;

[0026] An air extraction and purification device, disposed outside the cabin, for extracting and purifying the gas inside the cabin;

[0027] Wherein, the first end of the coaxial air duct is connected to the ventilation port, and the second end of the coaxial air duct is connected to the air extraction purification device.

[0028] By means of the above technical solution, the coaxial air duct provided by the technical solution of the present invention has at least the following advantages:

[0029] The present invention provides a coaxial air duct, comprising an outer air duct, an inner air duct and an air duct frame, wherein a first air duct is formed in the inner air duct; the air duct frame is supported between the outer air duct and the inner air duct, and a second air duct is formed between the outer wall of the inner air duct and the inner wall of the outer air duct; wherein the air duct frame is formed by winding a spring with a constant pitch and a variable diameter, so that the outer diameter of the air duct frame changes at a constant pitch, the outer air duct is sleeved on the outside of the inner air duct, and the first air duct is formed in the inner air duct. Since the air duct frame supports the outer air duct and the inner air duct, the second air duct is formed between the outer air duct and the inner air duct. Between the air ducts, a second air duct is formed between the outer wall of the inner air duct and the inner wall of the outer air duct, ensuring that one air duct can simultaneously realize the two functions of the air inlet duct and the air outlet duct. On the one hand, the air outlet duct and the air inlet duct are integrated, making the installation and disassembly of the pipeline convenient and quick, reducing the work intensity of the staff. At the same time, the single external pipeline makes the entire assembly and use space more tidy, and is convenient for the use and placement of other equipment. On the other hand, one pipeline is connected to one air outlet, so that the isolation cabin only needs to open one air outlet, ensuring the integrity of the isolation cabin. Since the isolation system has the beneficial effects of the above analysis, the isolation system provided by the embodiment of the present invention can solve the problem in the prior art that the isolation system needs to open multiple holes on the isolation cabin to connect the air outlet duct and the air inlet duct for air exchange, so that the isolation cabin only needs to open one air outlet, ensuring the integrity of the isolation cabin.

[0030] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the embodiments of the present invention and to implement them according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0032] Figure 1 is a cross-sectional view of a coaxial air duct provided by an embodiment of the present invention;

[0033] Figure 2 This is a structural diagram of an air duct skeleton of a coaxial air duct provided by an embodiment of the present invention;

[0034] Figure 3A first-view structural diagram of an air duct skeleton of a coaxial air duct provided by an embodiment of the present invention;

[0035] Figure 4 Cross-sectional view of the duct end;

[0036] Figure 5 Schematic diagram of the structure of the duct end.

[0037] Figures 1 to 5 Reference numerals in the figures include:

[0038] 10-inner air duct, 11-first air duct, 20-outer air duct, 21-second air duct, 30-air duct frame, 40-air duct end, 41-outer support pipe, 42-inner support pipe, 43-support frame, 44-outer connecting plate, 45-inner connecting plate, 46-first air duct at the air duct end, 47-second air duct at the air duct end. DETAILED DESCRIPTION

[0039] The present invention aims to solve the problem in the prior art that the air exchange duct of the isolation cabin needs to have separate air outlet and air inlet on the isolation cabin, and two separate pipes are required as the air outlet duct and the air inlet duct to be connected to the isolation cabin respectively, resulting in too many pipelines outside the entire isolation cabin, which is not conducive to aesthetics and affects the placement of equipment outside the isolation cabin. At the same time, multiple pipelines also increase production and installation costs. A coaxial air duct and isolation system are provided.

[0040] To further illustrate the technical means and effects employed by the present invention to achieve the objectives of the intended embodiments, the following, in conjunction with the accompanying drawings and preferred embodiments, provides a detailed description of the specific implementation, structure, features, and effects of the coaxial air duct according to the embodiments of the present invention. In the following description, different references to "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0041] The term "and / or" in this article is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B, specifically understood as: A and B may be included at the same time, A may exist alone, or B may exist alone, and any of the above three situations may exist.

[0042] The coaxial air duct and isolation system provided in this embodiment can avoid the problem of complicated installation and removal of pipelines and increased workload of workers due to installing too many ventilation pipelines. At the same time, the single external pipeline makes the entire assembly space tidier, facilitates the use and placement of other equipment, and is easy to use.

[0043] Example 1

[0044] Figures 1 to 5An embodiment of a coaxial air duct is provided for the present invention.

[0045] like Figures 1 to 5 As shown, the present invention provides a coaxial air duct, comprising: an outer air duct 20, an inner air duct 10 and an air duct skeleton 30, wherein a first air duct 11 is formed in the inner air duct 10; the air duct skeleton 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; wherein the air duct skeleton 30 is formed by winding a spring with equal pitch variable diameter, so that the outer diameter of the air duct skeleton 30 changes at equal pitch.

[0046] In a specific implementation, the duct skeleton 30 can be made of an elastic material, such as spring steel wire or stainless steel. Since the elastic material has elastic deformation, it ensures that the duct skeleton can be compressed and stretched. On the one hand, it is convenient for transportation after compression, and on the other hand, the length can be adjusted according to needs.

[0047] Specifically, the outer air duct 20 is sleeved onto the outer portion of the inner air duct 10, forming a first air duct 11 within the inner air duct 10. Since the air duct skeleton 30 is supported between the outer air duct 20 and the inner air duct 10, 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 first air duct of the inner air duct 10 is used for return air and forms a negative pressure air path. 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 supply air and forms a positive pressure air path. In the prior art, a single-pipe negative pressure return air duct is used. If its outer wall is damaged, external polluted gas will enter the negative pressure return air duct through the damaged opening. The coaxial air duct of this embodiment adopts a double-layer pipe setting. Even if the wall of the outer air duct is slightly damaged or leaks, the outside gas cannot enter the second air duct due to the protection of the positive pressure second air duct, thereby preventing the polluted gas outside the outer air duct from leaking into the negative pressure first air duct.

[0048] The setting of the coaxial air duct ensures that one air duct can simultaneously realize the dual functions of the air inlet duct and the air outlet duct. On the one hand, the integration of the air outlet duct and the air inlet duct makes the installation and disassembly of the pipeline convenient and quick, reducing the workload of the staff. At the same time, the single external pipeline makes the entire assembly space tidier and convenient for the use and placement of other equipment. On the other hand, one pipeline is connected to one air outlet, so that the isolation cabin only needs to open one air outlet, ensuring the integrity of the isolation cabin.

[0049] Figures 1 to 5As shown, in a specific implementation, the spring with equal pitch and variable diameter includes at least one group of single winding groups, and the single winding group includes: a first spring steel wire and a second spring wire, and the first spring steel wire and the second spring wire are wound with the same starting point, the same pitch variation, opposite winding directions, the same extension direction, and the same end point.

[0050] Specifically, the first spring steel wire and the second spring wire in at least one group of monomer winding groups are wound with the same starting point, the same pitch diameter change, opposite winding directions, the same extension direction, and the same end point, ensuring that a group of monomer winding groups can form two basic longitudinally nested cylindrical skeleton cavities. Furthermore, the cylindrical skeleton cavity formed by the minimum diameter of the diameter change is used to carry the inner air duct 10, and the outer cylindrical skeleton formed by the maximum diameter of the diameter change is used to support the inside of the outer air duct 20, supporting the outer air duct 20 and the inner air duct 10, thereby providing support force for the formation of two air ducts and ensuring smooth ventilation.

[0051] Figures 1 to 5 As shown, in a specific implementation, the spring with equal pitch and variable diameter includes multiple groups of single winding groups, and the multiple groups of single winding groups are evenly rotated and distributed on the central axis of the air duct skeleton 30.

[0052] Specifically, the spring with variable pitch diameter includes multiple groups of single winding groups, which improves the supporting capacity of the outer air duct 20 and the inner air duct 10. On the one hand, it avoids the flattening and deformation of the air duct due to the excessive mass of the outer air duct 20 and the inner air duct 10 themselves. On the other hand, it avoids the deformation of the air duct due to the suction of the wind during the ventilation process of the first air duct 11 and the second air duct 21. It is worth noting that since the multiple groups of single winding groups are evenly rotated and distributed on the central axis of the air duct skeleton 30, the supporting force of the skeleton supporting the inner air duct 10 and the outer air duct 20 is uniform, thereby avoiding local deformation of the air duct and affecting ventilation.

[0053] Figures 1 to 5 As shown, in a specific implementation, at the i-th pitch position of the air duct skeleton 30, the outer diameter of the air duct skeleton 30 is a first size; at the i+1-th pitch position of the air duct skeleton 30, the outer diameter of the air duct skeleton 30 is a second size, and the second size is larger than the first size, wherein i is a positive integer greater than or equal to 1.

[0054] Specifically, the i-th pitch position of the duct skeleton 30 corresponds to an outer diameter of the duct skeleton 30 of the first size, and the i+1-th pitch position of the duct skeleton 30 corresponds to an outer diameter of the duct skeleton 30 of the second size, and the second size is larger than the first size, ensuring that the duct skeleton 30 is uniform and presents periodic diameter variation, so that the vertex intervals of the first size of the outer diameter are the same, and the vertex intervals of the second size are also the same.

[0055] Figures 1 to 5As shown, in a specific implementation, the inner air duct 10 is supported at the i-th pitch position of the air duct skeleton 30, and the outer air duct 20 is supported at the i+1-th pitch position.

[0056] Specifically, since the air duct skeleton 30 is uniform and shows periodic diameter variation, and the vertex spacing of the first dimension is the same, when the inner air duct 10 is supported at the i-th pitch position, it is ensured that the support points are evenly spaced and connected to the inner air duct 10, thereby making its supporting force evenly distributed. Similarly, the outer air duct 20 is supported at the said i+1-th pitch position, and the vertex spacing of the second dimension is also the same, thereby ensuring that the support points are evenly spaced and connected to the outer air duct 20, thereby making its supporting force evenly distributed.

[0057] Figures 1 to 5 As shown, in a specific implementation, it also includes an air duct end 40, and the air duct end 40 includes:

[0058] An outer support tube 41 , wherein a first end of the outer support tube 41 is connected to the outer air duct 20 , and a second end of the outer support tube 41 is provided with an outer connection plate 44 , and the outer connection plate 44 protrudes from the outer periphery of the outer support tube 41 ;

[0059] An inner support tube 42 , wherein a first end of the inner support tube 42 is connected to the inner support tube 42 , and a second end of the inner support tube 42 is provided with an inner connection plate 45 , and the inner connection plate 45 protrudes from the outer periphery of the inner support tube 42 ;

[0060] The support frame 43 is supported between the outer support tube 41 and the inner support tube 42 .

[0061] Figures 1 to 5 As shown, in a specific implementation, a first air duct 46 of the air duct end is formed in the inner support tube 42, and the first air duct 46 of the air duct end is connected with the first air duct 11;

[0062] The inner wall of the outer support tube 41 and the outer wall of the inner support tube 42 form a second air duct 47 at the end of the air duct. The second air duct 47 at the end of the air duct is connected to the second air duct 21 .

[0063] Specifically, the air duct end 40 can be used to connect to one end of the coaxial air duct, or to connect to both ends of the coaxial air duct, ensuring that the coaxial air duct can be connected to other devices. The material of the air duct end 40 can be non-metallic material or metal material, as long as it can be used as the end of the coaxial air duct to connect to other devices. The external connecting plate 44 and the internal connecting plate 45 are used to connect to other equipment. The connection method can be snap-on, magnetic connection or threaded connection. The connection method includes but is not limited to the above-mentioned connection methods.

[0064] Figures 1 to 5 As shown, in a specific implementation, the support frame 43 is formed by a plurality of support bars surrounding the outer circumference of the inner support tube 42.

[0065] Specifically, the support frame 43 is formed by several support bars around the outer periphery of the inner support tube 42. On the one hand, the support frame 43 supports the inner support tube 42 and the outer support tube 41 so that a second air duct 47 of the air duct end that can be connected to the second air duct 21 is formed therebetween. On the other hand, it also serves to reinforce the air duct end 40.

[0066] Figures 1 to 5 As shown, in a specific implementation, the first air duct 46 of the air duct end and the second air duct 47 of the air duct end have the same air flow cross-sectional area.

[0067] Specifically, the first air duct 46 at the end of the air duct and the second air duct 47 at the end of the air duct have the same air flow cross-sectional area, thereby ensuring the stability of air inlet and outlet of the two air ducts.

[0068] Figures 1 to 5 As shown, in a specific implementation, the outer air duct 20 and the inner air duct 10 are made of flexible materials.

[0069] Specifically, the material of the outer air duct 20 and the inner air duct 10 is a flexible and airtight material, which can be a single-layer tent cloth, plastic cloth, fiber cloth, etc., including but not limited to the above materials, as long as it meets the functions of flexibility and airtightness, or a multi-layer composite material, composite insulation, mildew-proof, moisture-proof, sound-absorbing material, etc. It is worth noting that since the outer air duct 20 and the inner air duct 10 are made of flexible materials, the air duct can be folded, stored, compressed, etc. according to its material characteristics, so that it takes up little space and is easy to store and transport.

[0070] Example 2

[0071] The present invention provides an isolation system, comprising: a cabin, a coaxial air duct and an air extraction and purification device, wherein the cabin wall is provided with an air exchange port, and the air extraction and purification device is arranged outside the cabin for extracting and purifying the gas inside the cabin, wherein the first end of the coaxial air duct is connected to the air exchange port, and the second end of the coaxial air duct is connected to the air extraction and purification device.

[0072] Specifically, the cabin can be an isolation tent, a square cabin, a ward, a factory building and other rooms, including but not limited to the above-mentioned cabin forms. The ventilation port is connected to a coaxial air duct connector for connecting to the air duct end 40, and at the same time, the first air duct 46 and the second air duct 47 are diverted to different directions, ensuring that the winds in the first air duct 46 and the second air duct 47 do not interfere with each other. At the same time, the air extraction and purification device is also connected to connectors for connecting to the first air duct 46 and the second air duct 47 respectively, ensuring that the air extraction and purification device, one port realizes the functions of exhausting and supplying filtered air.

[0073] Specifically, the coaxial air duct described in the second embodiment can directly adopt the coaxial air duct provided in the above embodiment. The specific implementation structure can refer to the relevant content described in the above embodiment, which will not be repeated here.

[0074] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0075] It is understood that the related features in the above devices can be referenced to each other. In addition, the "first", "second", etc. in the above embodiments are used to distinguish between the embodiments, and do not represent the advantages and disadvantages of the embodiments.

[0076] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0077] Similarly, it should be understood that in order to streamline the present disclosure and aid understanding of one or more of the various inventive aspects, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed apparatus should not be interpreted as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Accordingly, 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 the invention.

[0078] It will be appreciated by those skilled in the art that the components of the apparatus in the embodiment may be adaptively changed and arranged in one or more apparatuses different from the embodiment. The components in the embodiment may be combined into one component, and furthermore they may be divided into a plurality of subcomponents. All features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all components of any apparatus so disclosed may be combined in any combination, except that at least some of such features are mutually exclusive. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0079] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of the present invention and to form different embodiments. For example, in the claims below, 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 combinations thereof.

[0080] It should be noted that the above embodiments illustrate rather than limit the invention, and that alternative embodiments may be devised by a person skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of parts or components not listed in the claims. The word "a" or "an" preceding a part or component does not exclude the presence of a plurality of such parts or components. The invention may be implemented by means of an apparatus comprising several different parts. In claims enumerating several parts, several of these parts may be embodied by the same component item. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0081] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiment based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A coaxial air duct, characterized in that: include: External air duct; an inner air duct, wherein a first air duct is formed in the inner air duct, wherein the first air duct is used for returning air and forming a negative pressure air path; The air duct frame is supported between the outer air duct and the inner air duct, and a second air duct is formed between the outer wall of the inner air duct and the inner wall of the outer air duct, wherein the second air duct is used to supply air and form a positive pressure air path; The air duct skeleton is formed by winding springs with equal pitch and variable diameter, so that the outer diameter of the air duct skeleton changes at equal pitch; The spring with equal pitch and variable diameter includes at least one single winding group, and the single winding group includes: a first spring steel wire and a second spring wire, and the first spring steel wire and the second spring wire are wound with the same starting point, the same pitch and variable diameter, opposite winding directions, the same extension direction, and the same end point.

2. The coaxial air duct according to claim 1, characterized in that: The spring with equal pitch and variable diameter includes multiple groups of single winding groups, and the multiple groups of single winding groups are evenly distributed in rotation on the central axis of the air duct skeleton.

3. The coaxial air duct according to claim 1, characterized in that: At the i-th pitch position of the air duct skeleton, the outer diameter of the air duct skeleton is a first size; At the i+1th pitch position of the air duct skeleton, the outer diameter of the air duct skeleton is a second size, and the second size is larger than the first size, wherein i is a positive integer greater than or equal to 1.

4. The coaxial air duct according to claim 3, characterized in that: The inner air duct is supported at the i-th pitch position of the air duct skeleton, and the outer air duct is supported at the i+1-th pitch position.

5. The coaxial air duct according to claim 1, characterized in that: Also included is an air duct end, the air duct end including: An external support tube, wherein a first end of the external support tube is connected to the external air duct, and a second end of the external support tube is provided with an external connection plate, and the external connection plate protrudes from the outer periphery of the external support tube; An inner support tube, wherein the first end of the inner support tube is connected to the inner support tube, and the second end of the inner support tube is provided with an inner connecting disk, and the inner connecting disk protrudes from the outer periphery of the inner support tube; The support frame is supported between the outer support tube and the inner support tube.

6. The coaxial air duct according to claim 5, characterized in that: The first air duct of the air duct end is formed in the inner support tube, and the first air duct of the air duct end is connected with the first air duct; The second air duct of the air duct end is formed between the inner wall of the outer support tube and the outer wall of the inner support tube, and the second air duct of the air duct end is connected with the second air duct.

7. The coaxial air duct according to claim 5, characterized in that: The support frame is formed by a plurality of support bars surrounding the outer circumference of the inner support tube.

8. The coaxial air duct according to claim 6, characterized in that: The first air duct of the air duct end and the second air duct of the air duct end have the same air flow cross-sectional area.

9. An isolation system, characterized in that: include: A cabin, wherein a bulkhead of the cabin is provided with a ventilation port; The coaxial air duct according to any one of claims 1 to 8; An air extraction and purification device, disposed outside the cabin, for extracting and purifying the gas inside the cabin; Wherein, the first end of the coaxial air duct is connected to the ventilation port, and the second end of the coaxial air duct is connected to the air extraction purification device.

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