Double-layer spiral duct

Abstract

The utility model relates to the technical field of ventilation pipelines, and discloses a double-layer spiral air pipe which comprises an inner pipe and an outer pipe which are coaxially connected in a sleeved mode, an annular gap cavity is formed between the inner pipe and the outer pipe, and elastic assemblies are axially arranged in the gap cavity at intervals. Each elastic component consists of an inner framework, an outer framework and an elastic framework for connecting the inner framework and the outer framework which are coaxial; the outer framework is fixed on the inner wall of the outer pipe; the inner framework comprises framework sleeves and flexible framework strips which are alternately connected, and the framework strips are telescopically inserted into the adjacent framework sleeves; the elastic framework is formed by carbon steel spring pieces which are evenly distributed in the circumferential direction, each spring piece is of an arc-shaped structure formed by winding an elastic round rod, the arc top of each spring piece is clamped to the framework sleeve through a protruding block and a groove, and the arc foot is embedded into the inner wall of the outer framework through a square block. By arranging the elastic assembly, self-adaptive adjustment of the gap between the inner pipe and the outer pipe is achieved, the sound insulation and heat insulation functions of heat preservation cotton filling are achieved, the problems of structural instability and connection looseness caused by temperature changes are effectively solved, and the heat insulation pipe is suitable for high and low temperature working conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of ventilation duct, specifically is a double -layer spiral air pipe. BACKGROUND

[0002] As the core component of the ventilation system, the double -layer spiral air pipe plays a vital role in various buildings and industrial facilities, although it is widely used, but its traditional design has not small challenge.

[0003] Especially in the processing of the wind flow of big temperature change, the inner tube will produce significant size change because of thermal expansion and contraction, at the same time, the outer tube is directly exposed to the outside environment, and its temperature change is relatively small, resulting in the frequent fluctuation of the gap between the inner and outer tubes. Unfortunately, the traditional support structure mostly adopts rigid material, which is difficult to flexibly adapt to the gap change, in view of this, the inventor puts forward a double -layer spiral air pipe. UTILITARIAN CONTENT

[0004] (I) the technical problem solved

[0005] In view of the defects of the prior art, the utility model provides a double -layer spiral air pipe, which has the advantages of self -adaptation to the gap change between the inner and outer tubes, stable connection and the like, and solves the problems of unstable structure, loose connection and easy breakage of the inner tube of the traditional double -layer spiral air pipe under temperature change.

[0006] (II) technical scheme

[0007] In order to realize the above -mentioned self -adaptation to the gap change between the inner and outer tubes, the utility model provides the following technical scheme for the purpose of keeping stable connection:

[0008] A double -layer spiral air pipe, comprising an inner tube and an outer tube;

[0009] The outer tube is coaxially connected to the outer tube to form an annular gap cavity, and a plurality of elastic components are arranged in the gap cavity along the axial direction;

[0010] Each of the elastic components comprises an inner skeleton, an outer skeleton and an elastic skeleton connected with each other, wherein:

[0011] The outer wall of the outer skeleton is fixedly connected to the inner wall of the outer tube;

[0012] The inner skeleton comprises alternately connected skeleton sleeves and skeleton strips, the skeleton strip can be telescopicly connected in the adjacent skeleton sleeve, and the inner wall of the skeleton sleeve is fixed to the outer wall of the inner tube;

[0013] The elastic skeleton is composed of a plurality of spring sheets uniformly distributed in the circumferential direction, the spring sheet is an arc structure wound by an elastic round rod, and the arc top of each spring sheet is fixed to the outer wall of the skeleton sleeve, and the arc foot is fixed to the inner wall of the outer skeleton.

[0014] The utility model discloses preferably technical scheme is at, spring piece is carbon steel material quality, its curvature radius and the proportionality relation of inner tube outer diameter.

[0015] The utility model discloses preferably technical scheme is at, the skeleton strip adopts the flexible material to make.

[0016] The utility model discloses preferably technical scheme is at, the adjacent elasticity skeleton is filled with thermal insulation cotton, and the thermal insulation cotton distributes in the annular gap cavity between the inner skeleton and the outer skeleton.

[0017] The utility model discloses preferably technical scheme is at, the spring is set up in the skeleton cover, and the both ends of spring are connected with the end part of adjacent skeleton strip respectively.

[0018] The utility model discloses preferably technical scheme is at, and the spring piece arc top is equipped with the lug, and the outer wall of skeleton cover is equipped with the recess that is matched with the lug.

[0019] The utility model discloses preferably technical scheme is at, and the arc foot of spring piece is equipped with the square block embedding the inner wall of outer skeleton.

[0020] (Three) beneficial effects

[0021] Compared with the prior art, the utility model provides a double-layer spiral air pipe, has the following beneficial effects:

[0022] The double-layer spiral air pipe, through the inner tube and the outer tube of coaxial sleeve connection and the elastic component of gap cavity setting, realizes the self -adaptation adjustment of inner and outer pipe gap, effectively copes with the expansion and shrinkage of inner tube caused by temperature change, avoids the problem of unstable structure and loose connection, significantly improves the durability and safety of air pipe.

[0023] The double-layer spiral air pipe, through the combination design of the spring piece of arc structure that adopts the elastic round bar and the flexible skeleton strip, and the stable connection of spring piece and skeleton cover, outer skeleton, ensures the stable connection of air pipe under temperature change, prevents the rupture of inner tube, improves the overall stability and ventilation efficiency of air pipe. ACCURACY OF DRAWINGS

[0024] Figure 1 It is whole structure schematic diagram of the utility model;

[0025] Figure 2 It is elastic component structure schematic diagram in the utility model;

[0026] Figure 3 It is inner skeleton structure section view in the utility model;

[0027] Figure 4 It is Figure 3 It is structure enlarged schematic diagram in A place.

[0028] Figure 5 It is the outer skeleton structure sectional view in the utility model;

[0029] Figure 6 It is Figure 5 It is the structure enlarged schematic view at B in the utility model;

[0030] Figure 7 It is the spring sheet, square block and protruding block structure simplified view in the utility model;

[0031] Figure 8 It is the spring sheet, square block and protruding block structure perspective view in the utility model.

[0032] In the drawing: 1, outer tube; 2, inner tube; 3, elastic assembly; 31, outer skeleton; 32, inner skeleton; 321, skeleton cover; 322, skeleton strip; 323, spring; 324, groove; 33, elastic skeleton; 331, spring sheet; 332, square block; 333, protruding block; 4, thermal insulation cotton. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0034] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0035] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] Please refer to Figures 1-8 A double-layer spiral air duct, comprising an inner tube 2 and an outer tube 1;

[0037] The outer tube 1 is coaxially sleeved outside the inner tube 2 to form an annular gap cavity (not marked, which has been drawn in the figure), and a plurality of elastic assemblies 3 are arranged in the gap cavity in an axial direction;

[0038] Each elastic assembly 3 includes an inner skeleton 32, an outer skeleton 31, and an elastic skeleton 33 connecting the two, wherein:

[0039] The outer wall of the outer skeleton 31 is fixedly connected to the inner wall of the outer tube 1;

[0040] The inner skeleton 32 includes alternately connected skeleton sleeves 321 and skeleton strips 322, the skeleton strip 322 can be telescopically inserted into the adjacent skeleton sleeve 321, and the inner wall of the skeleton sleeve 321 is fixed to the outer wall of the inner tube 2;

[0041] The elastic skeleton 33 is composed of a plurality of spring sheets 331 uniformly distributed in the circumferential direction, the spring sheet 331 is an arc-shaped structure wound by an elastic round rod, the arc top of each spring sheet 331 is fixed to the outer wall of the skeleton sleeve 321 through a clamping structure, and the arc foot is fixed to the inner wall of the outer skeleton 31 through an embedding structure.

[0042] In this embodiment, the spring sheet 331 is made of carbon steel material, and the curvature radius thereof is in a proportional relationship with the outer diameter of the inner tube 2.

[0043] It should be noted that the curvature radius of the spring sheet 331 is in a proportional relationship of 0.8:1 with the outer diameter of the inner tube 2, and this design not only ensures the strength and durability of the spring sheet 331, but also ensures that it can adapt to the change of the outer diameter of the inner tube 2, thereby more effectively providing support and buffering when the temperature changes.

[0044] In this embodiment, the skeleton strip 322 is made of a flexible material.

[0045] It should be noted that the selection of the flexible material enables the skeleton strip 322 to flexibly stretch and contract when the inner tube 2 expands and contracts due to heat, without being damaged due to excessive stress, further enhancing the adaptability and durability of the air duct.

[0046] In this embodiment, the adjacent elastic skeletons 33 are filled with thermal insulation cotton 4, and the thermal insulation cotton 4 is distributed in the annular gap cavity between the inner skeleton 32 and the outer skeleton 31.

[0047] It should be noted that the filling of the thermal insulation cotton 4 not only improves the heat preservation performance of the air duct, reduces energy loss, but also plays a role in sound insulation and noise reduction, improving the overall performance of the air duct.

[0048] In this embodiment, a spring 323 is arranged in the skeleton sleeve 321, and the two ends of the spring 323 are respectively connected to the end portions of the adjacent skeleton strips 322.

[0049] Need to explain, this design enhances the stability of the connection between the skeleton strip 322, so that the inner skeleton 32 is more coordinated when dealing with the change of the inner tube 2, improve the overall stability of the duct.

[0050] In this embodiment, the spring sheet 331 arc top is provided with a protrusion 333, and the outer wall of the skeleton sleeve 321 is provided with a groove 324 matched with the protrusion 333.

[0051] Need to explain, this kind of clamping structure ensures the stable connection between the spring sheet 331 and the skeleton sleeve 321, prevents the spring sheet 331 from loosening or falling off in the long-term use process.

[0052] In this embodiment, the arc foot of the spring sheet 331 is provided with a square block 332 embedded in the inner wall of the outer skeleton 31.

[0053] Need to explain, this embedded structure not only simplifies the connection process of the spring sheet 331 and the outer skeleton 31, but also improves the firmness and stability of the connection, ensures the reliable operation of the duct under temperature change.

[0054] Need to further explain, the spring sheet 331 has a certain pre-tightening force when installed, and through the clamping relationship of the upper end and the lower end, the spring sheet 331 is tightly connected with the inner skeleton 32 and the outer skeleton 31.

[0055] In summary: the double-layer spiral duct realizes the self-adaptive adjustment of the gap between the inner and outer tubes 1 through the coaxial sleeve connection of the inner tube 2 and the outer tube 1 and the elastic component 3 arranged in the gap cavity, effectively deals with the expansion and contraction of the inner tube 2 caused by temperature change, avoids the problems of unstable structure and loose connection, and significantly improves the durability and safety of the duct.

[0056] The double-layer spiral duct, through the combination design of the spring sheet 331 with arc-shaped structure made of elastic round rod and the flexible skeleton strip 322, and the stable connection of the spring sheet 331 with the skeleton sleeve 321 and the outer skeleton 31, ensures the stable connection of the duct under temperature change, prevents the inner tube 2 from breaking, and improves the overall stability and ventilation efficiency of the duct.

[0057] Working principle: when the temperature change causes the thermal expansion and contraction of the inner tube 2, the skeleton strip 322 in the inner skeleton 32 can be inserted and connected in the skeleton sleeve 321 to adapt to the change of the inner tube 2. At the same time, the arc-shaped spring sheet 331 in the elastic skeleton 33 can be elastically deformed with the change of the inner skeleton 32, so as to keep the gap between the inner and outer tubes 1 stable. This self-adaptive adjustment mechanism effectively avoids the problems of unstable structure and loose connection caused by temperature change.

[0058] In addition, the strength and durability of the carbon steel spring sheet 331 ensure its reliability during long-term use, while the flexible skeleton strip 322 enhances the adaptability and durability of the air duct. The filling of the thermal insulation cotton 4 further improves the thermal insulation performance and sound insulation and noise reduction effect of the air duct.

[0059] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A double-layer spiral air duct, comprising an inner tube and an outer tube, characterized in that: the outer tube is coaxially sleeved outside the inner tube to form an annular gap cavity, and a plurality of elastic assemblies are arranged in the gap cavity in an axial direction; each of the elastic assemblies comprises an inner skeleton, an outer skeleton and an elastic skeleton arranged coaxially, wherein: the outer wall of the outer skeleton is fixedly connected to the inner wall of the outer tube; the inner skeleton comprises alternately connected skeleton sleeves and skeleton strips, the skeleton strips are telescopically connected in the adjacent skeleton sleeves, and the inner wall of the skeleton sleeve is fixed to the outer wall of the inner tube; the elastic skeleton is composed of a plurality of spring pieces which are uniformly distributed in a circumferential direction, the spring pieces are arc-shaped structures wound by elastic round rods, the arc top of each spring piece is fixed to the outer wall of the skeleton sleeve, and the arc foot is fixed to the inner wall of the outer skeleton; the spring pieces are made of carbon steel, and the curvature radius of the spring pieces is in a proportional relationship with the outer diameter of the inner tube; the skeleton strips are made of flexible material; heat insulation cotton is filled between the adjacent elastic skeletons, and the heat insulation cotton is distributed in the annular gap cavity between the inner skeleton and the outer skeleton; a spring is arranged in the skeleton sleeve, and the two ends of the spring are respectively connected to the end portions of the adjacent skeleton strips; the arc top of the spring piece is provided with a protrusion, and the outer wall of the skeleton sleeve is provided with a groove matched with the protrusion; and the arc foot of the spring piece is provided with a square block embedded in the inner wall of the outer skeleton. ​ ​ ​ ​ ​ 2. A double helix duct according to claim 1, wherein: ​ 3. A double helix duct according to claim 1, wherein: ​ 4. A double helix duct according to claim 1, wherein: ​ 5. A double helix duct according to claim 1, wherein: ​ 6. A double helix duct according to claim 1, wherein: ​ 7. A double helix duct according to claim 1, wherein: ​

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