CN217785904U - Spiral heat exchange tube - Google Patents

Abstract

The utility model relates to the field of heat exchange equipment, in particular to a spiral heat exchange tube, which comprises an inner tube wall and an outer tube wall connected to the inner tube wall, wherein the two sides of the inner tube wall and the outer tube wall in the length direction are hermetically connected, and at least one first medium flow channel is formed between the inner tube wall and the outer tube wall; the inner pipe wall and the outer pipe wall are spirally curled into a heat exchange pipe along the axis after being connected, the inner pipe wall between two adjacent spiral units is in sealed butt joint, and a second medium flow channel is formed by spirally enclosing the inner pipe wall; the two end parts of the inner pipe wall extend out of the two end parts of the outer pipe wall, the two end parts of the outer pipe wall are connected to the outer side of the inner pipe wall in a sealing mode, and a first input pipe and a first output pipe which are communicated with a first medium flow channel between the inner pipe wall and the outer pipe wall are arranged on the two end parts of the outer pipe wall. The scheme provides a new construction structure of the spiral heat exchange tube, and the spiral heat exchange tube constructed by adopting the structure is not limited by the process of the diameter of the threaded tube and the diameter of the steel tube; and when the large-diameter spiral heat exchange tube is constructed, the forming is more convenient.

Description

Spiral heat exchange tube

Technical Field

The utility model relates to a indirect heating equipment field especially relates to a spiral heat exchange tube.

Background

The spiral heat exchange tube is one of heat exchangers, has excellent heat exchange performance, and is widely applied to general equipment in the fields of refrigeration and air conditioning, chemical engineering, power and the like. The spiral heat exchange tube generally comprises an inner tube and an outer tube, and spiral grooves or spiral protrusions are formed on the outer wall of the inner tube and/or the inner wall of the outer tube. When the heat exchanger is used, the medium A is introduced into the inner pipe, the medium B is introduced between the inner pipe and the outer pipe, and the heat exchange is realized by the reverse convection of the medium A and the medium B. At present, the spiral heat exchange tube is constructed by inserting an inner tube into an outer tube during processing, wherein the inner tube is generally a threaded tube, and the outer tube is generally a light tube; specifically, reference may be made to a reinforced spiral tube high-efficiency heat exchanger described in the chinese utility model patent document with the publication number "CN 205279802U".

However, in the above solution, when the spiral heat exchange tube is coiled into a coil (such as the heat exchanger described in the prior patent with the publication number "CN 205279802U"), there is a limitation in the size of the inner tube and the outer tube because the larger the tube diameter, the more difficult the spiral is. On the other hand, when constructing the spiral heat exchange tubes with different tube diameters, the construction is limited by the current equipment and process, for example, when constructing the spiral heat exchange tube with a large tube diameter, a threaded tube (i.e., an inner tube) and a steel tube (i.e., an outer tube) with a large tube diameter are required to be configured, and if the current equipment and process of an enterprise cannot be configured, the processing of the spiral heat exchange tube with a large tube diameter cannot be realized.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a spiral heat exchange tube with a new structure.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a spiral heat exchange tube is characterized in that: the device comprises an inner pipe wall and an outer pipe wall connected to the inner pipe wall, wherein the inner pipe wall is hermetically connected with two sides of the outer pipe wall in the length direction, and at least one first medium flow channel is formed between the inner pipe wall and the outer pipe wall; the inner pipe wall and the outer pipe wall are spirally curled into a heat exchange pipe along the axis after being connected, the inner pipe wall between two adjacent spiral units is in sealed butt joint, and a second medium flow channel is formed by spirally enclosing the inner pipe wall; the two end parts of the inner pipe wall extend out of the two end parts of the outer pipe wall, the two end parts of the outer pipe wall are connected to the outer side of the inner pipe wall in a sealing mode, and a first input pipe and a first output pipe which are communicated with a first medium flow channel between the inner pipe wall and the outer pipe wall are arranged on the two end parts of the outer pipe wall.

The utility model adopts the above technical scheme, this technical scheme relates to a spiral heat exchange tube, the length direction both sides of inner tube wall and outer tube wall in this spiral heat exchange tube are sealing connection, make between the two form first medium runner; and then spirally curling the combined plate connected with the inner pipe wall and the outer pipe wall along the axis to form the heat exchange pipe, wherein the inner pipe walls between two adjacent spiral units are in sealed butt joint (generally adopting welding), and the inner pipe walls are spirally enclosed to form a second medium flow channel. The first medium flow channel is communicated with the first input pipe and the first output pipe on two sides of the first medium flow channel, and two end parts of the inner pipe wall extend out of two ends of the outer pipe wall to be used as a second input pipe and a second output pipe which are respectively communicated with the second medium flow channel. When the heat exchanger is used, the first medium flow channel between the inner pipe wall and the outer pipe wall is used for introducing a medium A, the second medium flow channel formed by enclosing the inner pipe wall is used for introducing a medium B, and heat exchange is realized by the reverse convection of the medium A and the medium B.

The scheme provides a new construction structure of the spiral heat exchange tube, and the spiral heat exchange tube constructed by adopting the structure does not need to be provided with a threaded tube and a steel tube and is not limited by the diameter process of the threaded tube and the steel tube; and when constructing the large-diameter spiral heat exchange tube, the combined plate connected with the inner tube wall and the outer tube wall has smaller spiral curling amplitude along the axis, so the forming is more convenient.

In a specific embodiment, a composite plate for connecting the inner and outer pipe walls may be used in one of three ways:

the first scheme is as follows: the two sides of the inner pipe wall in the length direction are provided with linear convex strips in an outward protruding mode, the linear convex strips on the two sides of the inner pipe wall are connected with the outer pipe wall, the inner pipe wall is enabled to be arched relative to the outer pipe wall, and a first medium flow channel is formed between the inner pipe wall and the outer pipe wall.

The second scheme is as follows: the two sides of the length direction of the outer pipe wall are provided with linear convex strips in an inward protruding mode, the linear convex strips on the two sides of the outer pipe wall are connected with the inner pipe wall, the outer pipe wall is enabled to arch relative to the inner pipe wall, and a first medium flow channel is formed between the outer pipe wall and the inner pipe wall.

The third scheme is as follows: linear convex strips are arranged on two sides of the inner pipe wall in the length direction in a protruding mode, and linear convex strips are arranged on two sides of the outer pipe wall in the length direction in a protruding mode; the linear raised strips on the two sides of the outer pipe wall are connected with the linear raised strips on the two sides of the inner pipe wall, so that the outer pipe wall and the inner pipe wall are relatively arched, and a first medium flow channel is formed between the outer pipe wall and the inner pipe wall.

The three schemes are that linear convex strips are formed on two sides of the inner pipe wall and/or the outer pipe wall, welding and fixing are carried out through the linear convex strips, and at least one side of the pipe wall in the outer pipe wall and the inner pipe wall is relatively arched, so that a first medium flow channel is formed.

In a further preferred scheme, the middle parts of the inner pipe wall and the outer pipe wall are connected and fixed with each other through at least one linear connecting part arranged along the length direction, and the linear connecting part separates the inner pipe wall and the outer pipe wall to form at least two first medium flow channels which are not communicated with each other. According to the scheme, the edges of two sides of the inner pipe wall and/or the outer pipe wall are connected in a sealing mode through the linear raised lines, at least one linear connecting part arranged in the length direction is arranged in the middle of the inner pipe wall and the middle of the outer pipe wall, and the first medium flow channel is constructed between two adjacent linear connecting parts or between the linear connecting parts and the linear raised lines at the edges, so that the spiral heat exchange pipe with a plurality of first medium flow channels is constructed, and compared with the scheme of a single first medium flow channel, the heat exchange efficiency is improved.

On the basis of the scheme that a plurality of first medium flow channels are arranged, a collecting cavity and a distributing cavity are formed between the two end parts of the outer pipe wall and the outer wall of the inner pipe wall respectively, and the head and tail ends of the plurality of first medium flow channels which are not communicated with each other are communicated with the distributing cavity and the collecting cavity respectively; the first input pipe is communicated with the distribution cavity, and the first output pipe is communicated with the collection cavity. In the scheme, the heads and the tails of a plurality of first medium flow channels which are not communicated with each other are respectively connected with the distribution cavity and the collection cavity; after flowing in from the first input pipe, the medium A is distributed to each first medium flow channel through the distribution cavity, and then confluence is carried out in the collection cavity; thus, the medium A can be uniformly distributed, and the heat exchange uniformity is ensured.

In a further preferred embodiment, the inner pipe wall and the outer pipe wall are further connected with each other through a plurality of connecting bumps, and the plurality of connecting bumps are arranged in the first medium flow channel at intervals. In the scheme, the inner pipe wall and the outer pipe wall are connected with each other through the plurality of connecting salient points, on one hand, the connection between the inner pipe wall and the outer pipe wall is strengthened, the phenomenon that the middle part of the inner pipe wall or the outer pipe wall is deformed (such as sunken or raised) due to insufficient strength is avoided, on the other hand, the connecting salient points are formed in the first medium flow channel, the turbulent flow effect on the medium A is achieved, and the heat exchange efficiency is improved.

In the specific implementation process, one of the following three schemes can be adopted to construct the connection bump:

the first scheme is as follows: the inner pipe wall is provided with a boss protruding outwards, and the boss is connected with the outer pipe wall to form a connection convex point.

The second scheme is as follows: the outer pipe wall is provided with a boss protruding inwards, and the boss is connected with the inner pipe wall to form a connection convex point.

In the third scheme: the inner pipe wall is provided with a boss protruding outwards, and the outer pipe wall is provided with a boss protruding inwards; the lug bosses on the inner pipe wall are connected with the lug bosses on the outer pipe wall to form connecting salient points.

Preferably, fins are arranged on the inner wall of the outer pipe wall and/or the outer wall of the inner pipe wall in the first medium flow channel, so that the heat exchange area can be increased through the fins, and the heat exchange effect is further improved.

In a further preferred scheme, the outer side of the outer pipe wall is further sleeved with a sleeve, two end parts of the outer pipe wall extend out of two ends of the sleeve, two end parts of the sleeve are connected to the outer wall of the outer pipe wall in a sealing mode, and a third medium flow channel is formed between the sleeve and the outer pipe wall; and a third input pipe and a third output pipe which are communicated with the third medium flow passage are arranged at the two end parts of the sleeve. In the technical scheme, after the inner pipe wall and the outer pipe wall are connected and spirally curled into the heat exchange pipe along the axis, the outer side of the heat exchange pipe is sleeved with the sleeve, and a third medium flow channel is formed between the sleeve and the outer pipe wall. Under the structure, the second medium flow channel and the third medium flow channel can be simultaneously filled with the medium B, the first medium flow channel is filled with the medium A, the medium A and the medium B on the inner side and the outer side of the medium A exchange heat simultaneously, and the heat exchange effect is better.

Drawings

Fig. 1 is a schematic diagram of a spiral heat exchange tube structure with a single flow channel.

Fig. 2 is a cross-sectional view of fig. 1.

Fig. 3 is an enlarged view of a portion a of fig. 2.

Fig. 4 is a schematic diagram of a multi-channel spiral heat exchange tube structure.

Fig. 5 is a cross-sectional view of fig. 4.

Fig. 6 is an enlarged view of a portion B of fig. 5.

Fig. 7 is a schematic diagram of a spiral heat exchange tube structure with two sides exchanging heat.

Fig. 8 is a cross-sectional view of fig. 7.

Fig. 9 is an enlarged view of a portion C of fig. 8.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do 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 should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 to 9, the present embodiment relates to a spiral heat exchange tube, which includes an inner tube wall 1 and an outer tube wall 2 connected to the inner tube wall 1, wherein two sides of the inner tube wall 1 and the outer tube wall 2 in the length direction are hermetically connected, and at least one first medium flow channel 3 is formed between the inner tube wall 1 and the outer tube wall 2. The inner pipe wall 1 and the outer pipe wall 2 are spirally curled into a heat exchange pipe 10 along the axis after being connected, the inner pipe wall 1 between two adjacent spiral units is in sealed butt joint, and a second medium flow channel 4 is formed by spirally enclosing the inner pipe wall 1. The two ends of the inner pipe wall 1 extend out of the two ends of the outer pipe wall 2, the two ends of the outer pipe wall 2 are hermetically connected to the outer side of the inner pipe wall 1, and the two ends are provided with a first input pipe 31 and a first output pipe 32 which are communicated with the first medium flow channel 3 between the inner pipe wall 1 and the outer pipe wall 2.

The two sides of the inner pipe wall 1 and the outer pipe wall 2 in the spiral heat exchange pipe in the length direction are hermetically connected, so that a first medium flow channel 3 is formed between the two. And then spirally curling the combined plate connected with the inner pipe wall 1 and the outer pipe wall 2 along the axis of the combined plate into a heat exchange pipe 10, wherein the inner pipe walls 1 between two adjacent spiral units are in sealed butt joint (generally adopting welding), and a second medium flow channel 4 is formed by spirally surrounding the inner pipe walls 1. The first medium flow channel 3 is communicated with the first input pipe 31 and the first output pipe 32 at two sides, and two ends of the inner pipe wall 1 extend out of two ends of the outer pipe wall 2 to be used as a second input pipe 41 and a second output pipe 42 which are respectively communicated with the second medium flow channel 4. When the heat exchanger is used, a medium A is introduced into a first medium flow channel 3 between the inner pipe wall 1 and the outer pipe wall 2, a medium B is introduced into a second medium flow channel 4 formed by enclosing the inner pipe wall 1, and heat exchange is realized by countercurrent of the medium A and the medium B.

The spiral heat exchange tube constructed by the structure does not need to be provided with a threaded tube and a steel tube and is not limited by the diameter process of the threaded tube and the steel tube. And when constructing the large-diameter spiral heat exchange tube, the combined plate connected with the inner tube wall 1 and the outer tube wall 2 has smaller spiral curling amplitude along the axis, so the forming is more convenient.

In a specific embodiment, a combination plate for connecting the inner pipe wall 1 and the outer pipe wall 2 may be used in one of three ways: the first scheme is as follows: the two sides of the inner pipe wall 1 in the length direction are provided with linear convex strips 5 in an outward protruding mode, the linear convex strips 5 on the two sides of the inner pipe wall 1 are connected with the outer pipe wall 2, the inner pipe wall 1 is enabled to be arched relative to the outer pipe wall 2, and a first medium flow channel 3 is formed between the inner pipe wall 1 and the outer pipe wall 2.

The second scheme is as follows: linear convex strips 5 are arranged on two sides of the outer pipe wall 2 in the length direction in an inward protruding mode, the linear convex strips 5 on the two sides of the outer pipe wall 2 are connected with the inner pipe wall 1, the outer pipe wall 2 is enabled to arch relative to the inner pipe wall 1, and a first medium flow channel 3 is formed between the outer pipe wall and the inner pipe wall.

The third scheme is as follows: the two sides of the inner pipe wall 1 in the length direction are provided with linear convex strips 5 in an outward protruding mode, and the two sides of the outer pipe wall 2 in the length direction are provided with linear convex strips 5 in an inward protruding mode. The linear sand grip 5 of outer pipe wall 2 both sides is connected with the linear sand grip 5 of interior pipe wall 1 both sides, makes outer pipe wall 2 and interior pipe wall 1 all arch relatively and forms first medium runner 3 between the two.

The three schemes are all that linear convex strips 5 are constructed and formed on two sides of the inner pipe wall 1 and/or the outer pipe wall 2, welding and fixing are carried out through the linear convex strips 5, and at least one side of the outer pipe wall 2 and the inner pipe wall 1 is enabled to be relatively arched, so that a first medium flow channel 3 is formed.

In a further preferred scheme, fins are arranged on the inner wall of the outer pipe wall 2 and/or the outer wall of the inner pipe wall 1 in the first medium flow channel 3, so that the heat exchange area can be increased through the fins, and the heat exchange effect is further improved.

As shown in fig. 4 to 6, the middle portions of the inner pipe wall 1 and the outer pipe wall 2 are connected and fixed to each other at least by a linear connecting portion 6 arranged along the length direction, and the linear connecting portion 6 partitions the inner pipe wall 1 and the outer pipe wall 2 to form at least two first medium flow channels 3 that are not communicated with each other. According to the scheme, the two side edges of the inner pipe wall 1 and/or the outer pipe wall 2 are hermetically connected through the linear raised strips 5, at least one linear connecting part 6 arranged along the length direction is arranged in the middle of the inner pipe wall 1 and the outer pipe wall 2, and the first medium flow channel 3 is constructed between two adjacent linear connecting parts 6 or between the linear connecting parts 6 and the linear raised strips 5 at the edges, so that the spiral heat exchange pipe with the multiple first medium flow channels 3 is constructed, and compared with the scheme of a single first medium flow channel 3, the heat exchange efficiency is improved. On the basis of the scheme that a plurality of first medium flow channels 3 are arranged, a collecting cavity and a distributing cavity are respectively formed between the two end parts of the outer pipe wall 2 and the outer wall of the inner pipe wall 1, and the head end and the tail end of the plurality of first medium flow channels 3 which are not communicated with each other are respectively communicated with the distributing cavity 33 and the collecting cavity 34. The first inlet conduit 31 communicates with the distribution chamber 33 and the first outlet conduit 32 communicates with the collection chamber 34. In this embodiment, a plurality of first medium flow paths 3 that are not connected to each other connect the distribution chamber 33 and the collection chamber 34 end to end, respectively. The medium a flows in from the first inlet pipe 31, is distributed to each first medium flow passage 3 through the distribution chamber 33, and then is merged in the collection chamber 34. Thus, the medium A can be uniformly distributed, and uniform heat exchange is ensured.

In a further preferred scheme, the inner pipe wall 1 and the outer pipe wall 2 are further connected with each other through a plurality of connecting bumps, and the plurality of connecting bumps are arranged in the first medium flow channel 3 at intervals. In the scheme, the inner pipe wall 1 and the outer pipe wall 2 are connected with each other through a plurality of connecting salient points, on one hand, the connection between the inner pipe wall 1 and the outer pipe wall 2 is strengthened, the middle part of the inner pipe wall 1 or the outer pipe wall 2 is prevented from deforming (such as sinking or bulging) due to insufficient strength, on the other hand, the connecting salient points are formed in the first medium flow channel 3, the turbulent flow effect on the medium A is achieved, and the heat exchange efficiency is improved. In the specific implementation process, the connection bump can be constructed by adopting one of the following three schemes:

the first scheme is as follows: the inner pipe wall 1 is provided with a boss protruding outwards, and the boss is connected with the outer pipe wall 2 to form a connection salient point.

The second scheme is as follows: the outer pipe wall 2 is provided with a boss protruding inwards, and the boss is connected with the inner pipe wall 1 to form a connecting convex point.

In the third scheme: the inner pipe wall 1 is provided with a boss protruding outwards, and the outer pipe wall 2 is provided with a boss protruding inwards. The lug bosses on the inner pipe wall 1 are connected with the lug bosses on the outer pipe wall 2 to form connecting salient points.

As shown in fig. 7-9, in the spiral heat exchange tube for bilateral heat exchange, a sleeve 7 is further sleeved outside the outer tube wall 2, two end portions of the outer tube wall 2 extend out of two ends of the sleeve 7, two end portions of the sleeve 7 are hermetically connected to the outer wall of the outer tube wall 2, and a third medium flow channel 71 is formed between the sleeve 7 and the outer tube wall 2. A third input pipe 72 and a third output pipe 73 which are communicated with the third medium flow passage 71 are arranged at two end parts of the sleeve 7. In this technical solution, after the inner tube wall 1 and the outer tube wall 2 are connected and spirally curled along the axis thereof to form the heat exchange tube 10, the sleeve 7 is sleeved outside, and a third medium flow channel 71 is formed between the sleeve 7 and the outer tube wall 2. Under the structure, the second medium flow channel 4 and the third medium flow channel 71 can be simultaneously filled with the medium B, the first medium flow channel 3 is filled with the medium A, the medium A and the medium B on the inner side and the outer side of the medium A exchange heat simultaneously, and the heat exchange effect is better.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the invention, and that those skilled in the art may make variations, modifications, substitutions and alterations herein without departing from the spirit and scope of the invention.

Claims (8)

1. A spiral heat exchange tube is characterized in that: the device comprises an inner pipe wall (1) and an outer pipe wall (2) connected to the inner pipe wall (1), wherein the inner pipe wall (1) is hermetically connected with two sides of the outer pipe wall (2) in the length direction, and at least one first medium flow channel (3) is formed between the inner pipe wall (1) and the outer pipe wall (2); the inner pipe wall (1) and the outer pipe wall (2) are spirally curled into a heat exchange pipe (10) along the axis after being connected, the inner pipe walls (1) between two adjacent spiral units are in sealed butt joint, and the inner pipe walls (1) are spirally enclosed to form a second medium flow channel (4); the two end parts of the inner pipe wall (1) extend out of the two end parts of the outer pipe wall (2), the two end parts of the outer pipe wall (2) are hermetically connected to the outer side of the inner pipe wall (1), and a first input pipe (31) and a first output pipe (32) which are communicated with a first medium flow channel (3) between the inner pipe wall (1) and the outer pipe wall (2) are arranged on the two end parts.

2. A spiral heat exchange tube according to claim 1, wherein: linear convex strips (5) are outwards protruded from two sides of the inner pipe wall (1) in the length direction, the linear convex strips (5) on the two sides of the inner pipe wall (1) are connected with the outer pipe wall (2), so that the inner pipe wall (1) is arched relative to the outer pipe wall (2) and a first medium flow channel (3) is formed between the inner pipe wall and the outer pipe wall;

or linear convex strips (5) are arranged on two sides of the outer pipe wall (2) in the length direction in an inward protruding mode, the linear convex strips (5) on the two sides of the outer pipe wall (2) are connected with the inner pipe wall (1), the outer pipe wall (2) is enabled to be arched relative to the inner pipe wall (1), and a first medium flow channel (3) is formed between the outer pipe wall and the inner pipe wall;

or both sides of the length direction of the inner pipe wall (1) are provided with linear convex strips (5) in an outward protruding manner, and both sides of the length direction of the outer pipe wall (2) are provided with linear convex strips (5) in an inward protruding manner; linear sand grip (5) of outer pipe wall (2) both sides are connected with linear sand grip (5) of interior pipe wall (1) both sides, make outer pipe wall (2) and interior pipe wall (1) all arch relatively and form first medium runner (3) between the two.

3. A spiral heat exchange tube according to claim 1, wherein: the middle parts of the inner pipe wall (1) and the outer pipe wall (2) are connected and fixed with each other at least through a linear connecting part (6) arranged along the length direction, and the linear connecting part (6) separates the inner pipe wall (1) and the outer pipe wall (2) to form at least two first medium flow channels (3) which are not communicated with each other.

4. A spiral heat exchange tube according to claim 3, wherein: a collecting cavity (34) and a distributing cavity (33) are respectively formed between the two end parts of the outer pipe wall (2) and the outer wall of the inner pipe wall (1), and the head end and the tail end of the first medium flow channels (3) which are not communicated with each other are respectively communicated with the distributing cavity (33) and the collecting cavity (34); the first inlet conduit (31) communicates with the distribution chamber (33) and the first outlet conduit (32) communicates with the collection chamber (34).

5. A spiral heat exchange tube according to claim 1, wherein: the inner pipe wall (1) and the outer pipe wall (2) are further connected with each other through a plurality of connecting salient points, and the connecting salient points are arranged in the first medium flow channel (3) at intervals.

6. A spiral heat exchange tube according to claim 5, wherein: the inner pipe wall (1) is provided with a boss protruding outwards, and the boss is connected with the outer pipe wall (2) to form a connecting convex point; or the outer pipe wall (2) is provided with a boss protruding inwards, and the boss is connected with the inner pipe wall (1) to form a connecting convex point; or the inner pipe wall (1) is provided with a boss protruding outwards, and the outer pipe wall (2) is provided with a boss protruding inwards; the lug bosses on the inner pipe wall (1) are connected with the lug bosses on the outer pipe wall (2) to form connecting salient points.

7. A spiral heat exchange tube according to claim 1, wherein: fins are arranged on the inner wall of the outer pipe wall (2) and/or the outer wall of the inner pipe wall (1) in the first medium flow channel (3).

8. A spiral heat exchange tube according to any one of claims 1 to 7, wherein: a sleeve (7) is further sleeved on the outer side of the outer pipe wall (2), two end portions of the outer pipe wall (2) extend out of two ends of the sleeve (7), two end portions of the sleeve (7) are connected to the outer wall of the outer pipe wall (2) in a sealing mode, and a third medium flow channel (71) is formed between the sleeve (7) and the outer pipe wall (2); and a third input pipe (72) and a third output pipe (73) which are communicated with the third medium flow passage (71) are arranged at the two end parts of the sleeve (7).

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