Double-pipe heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, in particular to a double-pipe heat exchanger which comprises a tank body and a plurality of heat exchange units arranged in the tank body. The heat exchange unit is of a cylindrical structure, and a through hole is formed in the heat exchange unit; the multiple heat exchange units are sequentially arranged in a nested mode, that is, in every two adjacent heat exchange units, the inner heat exchange unit is inserted into the through hole of the outer heat exchange unit. In the same containing cavity space, the overall length of the spiral pipe located in the inner heat exchange unit can be obviously increased, meanwhile, the coiling gap of the outer heat exchange unit can be properly increased, and therefore the length difference of the spiral pipe on the inner side and the spiral pipe on the outer side is reduced as much as possible, and the heat exchange degree of the inner side and the outer side in the double-pipe heat exchanger becomes uniform. Meanwhile, due to the fact that the whole length of the spiral pipe located in the inner heat exchange unit is increased in the same containing cavity space, the heat exchange coefficient of the double-pipe heat exchanger is increased, and then the heat exchange capacity of the double-pipe heat exchanger is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a shell and tube heat exchanger. Background Art

[0002] A traditional heat exchanger usually includes a tank body and heat exchange tubes arranged in the tank body. The tank body is provided with an inlet and an outlet. After the liquid to be heat exchanged is introduced into the tank body through the inlet, the liquid to be heat exchanged exchanges heat with the heat exchange tubes inside the tank body.

[0003] In order to improve the heat exchange efficiency of the heat exchanger, multiple heat exchange tubes are arranged in the tank body. Each heat exchange tube is spirally coiled to form a heat exchange tube. The inner diameter of each heat exchange tube is different. Then multiple heat exchange tubes are stacked and nested from the inside to the outside. Figures 1 to 3 shown.

[0004] However, the heat exchange tubes on the outside of this heat exchanger are the longest, and the lengths of the heat exchange tubes decrease from the outside to the inside, resulting in different lengths of the inner and outer heat exchange tubes in the heat exchanger, causing uneven heat exchange inside and outside the heat exchanger. Utility Model Content

[0005] In view of this, the present invention provides a shell and tube heat exchanger to solve the problem that the lengths of the inner and outer heat exchange tubes in the heat exchanger are different, resulting in uneven heat exchange between the inner and outer parts of the heat exchanger.

[0006] In a first aspect, the present invention provides a double-tube heat exchanger, comprising:

[0007] Tank;

[0008] A plurality of heat exchange units are arranged in the tank body; the heat exchange units are cylindrical in structure, and a through hole is arranged inside the heat exchange units;

[0009] The multiple heat exchange units are nested in sequence, that is, in two adjacent heat exchange units, the inner heat exchange unit is inserted into the through hole of the outer heat exchange unit;

[0010] The internal heat exchange unit is composed of two first heat exchange tube groups, each of which includes a plurality of first spiral tubes, which are arranged side by side and closely together along the coiling direction; when coiling, each first heat exchange tube group forms a coiling gap;

[0011] Along the coiling direction, the coiling radius of the first spiral tube gradually decreases; at the first end of the first heat exchange tube group, the coiling radius of the first spiral tube is the smallest, and at the second end of the first heat exchange tube group, the coiling radius of the first spiral tube is the largest;

[0012] The first end of one of the first heat exchange tube groups is screwed into the first end of the other first heat exchange tube group along the winding gap to form the internal heat exchange unit.

[0013] Beneficial effects: The embodiment of the present invention gradually reduces the coiling radius of the spiral tube along the coiling direction of the spiral tube, and then relatively rotates and inserts the two heat exchange tube groups so that the two heat exchange tube groups are spirally crossed. Compared with the prior art method of simply stacking and nesting two heat exchange tubes with different inner diameters, such a structural arrangement can significantly increase the overall length of the spiral tube located in the inner heat exchange unit in the same accommodating cavity space. At the same time, the coiling gap of the outer heat exchange unit can be appropriately increased, thereby minimizing the length difference of the spiral tubes inside and outside as much as possible, thereby making the heat exchange degree inside and outside the shell and tube heat exchanger uniform. At the same time, since the overall length of the spiral tube located in the inner heat exchange unit is increased in the same accommodating cavity space, the heat transfer coefficient of the shell and tube heat exchanger is improved, thereby improving the heat transfer capacity of the shell and tube heat exchanger. In addition, the two heat exchange tube groups in each heat exchange tube are spirally crossed, and the coiling radii at both ends of the heat exchange tube group are different, which can significantly improve the turbulence effect during heat exchange and further improve the heat exchange efficiency of the shell and tube heat exchanger.

[0014] In an optional embodiment, in two adjacent heat exchange units, the coil gap of the outer heat exchange unit is larger than the coil gap of the inner heat exchange unit.

[0015] Beneficial effect: Since the length of the spiral tube in the inner heat exchange unit is longer, and the coiling radius of the spiral tube in the outer heat exchange unit is large, the length of the spiral tube in the outer heat exchange unit itself is very long. Therefore, in order to reduce the length difference between the spiral tubes in the inner and outer heat exchange units, the coiling gap of the outer heat exchange unit can be appropriately increased, thereby reducing the length difference between the inner and outer spiral tubes as much as possible, thereby making the heat exchange degree inside and outside the shell and tube heat exchanger uniform.

[0016] In an optional embodiment, two heat exchange units are provided in the tank body, namely the inner heat exchange unit and the outer heat exchange unit.

[0017] In an optional embodiment, the external heat exchange unit is composed of a second heat exchange tube group, and the second heat exchange tube group includes a plurality of second spiral tubes, and the plurality of second spiral tubes are arranged side by side in a horizontal direction; the horizontal direction is perpendicular to the winding direction of the second spiral tubes;

[0018] When the plurality of second spiral tubes are coiled together, the coiling radius of the second spiral tube located relatively inside is smaller than the coiling radius of the second spiral tube located relatively outside; and the coiling radius of each second spiral tube remains unchanged along the coiling direction.

[0019] In an optional embodiment, the external heat exchange unit is composed of a third heat exchange tube group, and the third heat exchange tube group includes a plurality of third spiral tubes, and the plurality of third spiral tubes are arranged side by side in the winding direction;

[0020] When a plurality of third spiral tubes are coiled together, the coiling radius of each third spiral tube remains unchanged along the coiling direction.

[0021] In an optional embodiment, the tank further comprises:

[0022] an inlet pipe, disposed at the edge of the tank body and communicating with the accommodating cavity;

[0023] An outlet pipe is arranged in the central area of ​​the tank body and is communicated with the accommodating cavity; the outlet pipe is correspondingly arranged with the heat exchange unit.

[0024] In an optional embodiment, the double-tube heat exchanger further includes:

[0025] The spoiler is at least arranged in the gaseous region of the heat exchange unit.

[0026] Beneficial Effects: This embodiment of the utility model provides spoilers in the gaseous region of the heat exchange unit. Because gaseous heat transfer performance is relatively poor and its flow characteristics differ from those of liquids, the addition of spoilers can better promote gas turbulence, enhance heat exchange between the gas and the heat exchange unit wall, and thus more effectively improve heat exchange efficiency.

[0027] In an optional embodiment, the spoiler is correspondingly embedded in the winding gap.

[0028] Beneficial effects: The embodiment of the utility model embeds the spoiler in the winding gap, which eliminates the need for additional fixing parts on the heat exchange unit, makes it easier for technicians to install the spoiler, and improves work efficiency to a certain extent.

[0029] In an optional embodiment, the spoiler is in a spiral strip structure and extends along the winding gap of the heat exchange unit.

[0030] Beneficial effect: The embodiment of the utility model sets the spoiler into a spiral strip structure, so that the gas can flow along the winding manner of the heat exchange unit, thereby increasing the contact area between the gas and the heat exchange unit, and further improving the heat exchange efficiency of the sleeve heat exchanger.

[0031] In an optional embodiment, the spoiler is made of a heat-conducting material, and the spoiler is tightly connected to the heat exchange unit.

[0032] Beneficial effect: The embodiment of the utility model sets the spoiler to a heat-conducting material, thereby further increasing the heat exchange area on the basis of the existing heat exchange area of ​​the heat exchange unit, thereby increasing the contact area between the gas and the heat exchange unit, and further improving the heat exchange efficiency of the sleeve heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in related technologies, the following briefly introduces the drawings required for use in the specific implementation methods or related technical descriptions. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0034] Figure 1 It is the overall structural diagram of the heat exchanger in the background technology;

[0035] Figure 2 A schematic diagram of the interior of a heat exchanger in the background art;

[0036] Figure 3 This is a schematic diagram of multiple heat exchange cylinders stacked and nested from the inside out in the background art;

[0037] Figure 4 Schematic diagram of a single spiral tube in an embodiment of the present invention;

[0038] Figure 5 Schematic diagram of two first heat exchange tube groups in the internal heat exchange unit in an embodiment of the present invention;

[0039] Figure 6 Schematic diagram of an internal heat exchange unit in an embodiment of the present invention;

[0040] Figure 7 A schematic diagram of the internal heat exchange unit in another direction according to an embodiment of the present invention;

[0041] Figure 8 This is a schematic diagram of a first embodiment of an internal and external heat exchange unit in an embodiment of the present invention;

[0042] Figure 9 Schematic diagram of the structure of the double-tube heat exchanger of the internal and external heat exchange unit in the first embodiment of the present invention;

[0043] Figure 10 This is a structural schematic diagram of a second embodiment of an external heat exchange unit according to an embodiment of the present invention;

[0044] Figure 11 Schematic diagram of the structure of the double-tube heat exchanger of the internal and external heat exchange unit in the second embodiment of the present invention;

[0045] Figure 12 Schematic diagram of the structure of a spoiler in an embodiment of the present invention;

[0046] Figure 13 This is a schematic diagram of the structure of the assembly of the spoiler and all the heat exchange units in an embodiment of the present invention.

[0047] Description of reference numerals:

[0048] 1. Tank; 2. Inlet pipe; 3. Outlet pipe; 4. Internal heat exchange unit; 41. First heat exchange tube group; 411. First spiral tube; 5. External heat exchange unit; 51. Second heat exchange tube group; 511. Second spiral tube; 52. Third heat exchange tube group; 521. Third spiral tube; 6. Spoiler; 7. Through hole;

[0049] R, coiling radius; D, coiling gap. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0051] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components; wireless connections or wired connections. A person skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0053] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] A traditional heat exchanger generally includes a tank body 1 and a heat exchange tube arranged in the tank body 1. The tank body 1 is provided with an inlet and an outlet. After the liquid to be exchanged is introduced into the tank body 1 through the inlet, the liquid to be exchanged exchanges heat with the heat exchange tube inside the tank body 1. In order to improve the heat exchange efficiency of the heat exchanger, Figures 1 to 3 As shown, a plurality of heat exchange tubes are arranged in the tank body 1, each heat exchange tube is spirally coiled to form a heat exchange tube, each heat exchange tube has a different inner diameter, and then the plurality of heat exchange tubes are stacked and nested in sequence from the inside to the outside.

[0055] For example, the 6-pipe sleeve winding method used in traditional heat exchangers is divided into three layers: outer layer, middle layer, and inner layer. There is no cross-coordination between the layers, and the turbulence effect is not obvious. At the same time, the spiral tube in the outermost heat exchange unit 5 is the longest, the spiral tube in the middle layer is longer, and the spiral tube on the innermost side is the shortest. Taking the 25P heat exchanger as an example, the length difference between the longest tube and the shortest tube is more than 2m, which will cause unevenness between the inner and outer heat exchangers, so the overall effect cannot reach the best.

[0056] In view of this, the present invention provides a shell and tube heat exchanger to solve the problem that the lengths of the inner and outer heat exchange tubes in the heat exchanger are different, resulting in uneven heat exchange between the inner and outer parts of the heat exchanger.

[0057] The following combination Figures 4 to 12 , describing the embodiments of the present utility model.

[0058] According to an embodiment of the present invention, on one hand, a double-tube heat exchanger is provided, which includes a tank body 1 and a plurality of heat exchange units.

[0059] Specifically, in this embodiment of the present invention, a housing 1 is provided with a receiving cavity, and multiple heat exchange units are disposed within the housing 1. The heat exchange units are cylindrical in structure and have through-holes 7 disposed therein. The multiple heat exchange units are nested in sequence, i.e., in two adjacent heat exchange units, the inner heat exchange unit 4 is inserted into the through-hole 7 of the outer heat exchange unit 5.

[0060] Furthermore, the internal heat exchange unit 4 is composed of two first heat exchange tube groups 41, each first heat exchange tube group 41 includes multiple first spiral tubes 411, and the multiple first spiral tubes 411 are arranged side by side in the coiling direction; when coiling, each first heat exchange tube group 41 forms a coiling gap D.

[0061] It should be noted that in this embodiment of the present invention, the internal heat exchange unit 4 can be configured to consist solely of two heat exchange tube groups. Each heat exchange tube group is composed of a plurality of first spiral tubes 411 arranged closely side by side. When the heat exchange tube groups are coiled, a coiling gap D is formed. The coiling gap D is similar to the thread groove on a screw, and the heat exchange tube group is similar to the threaded protrusion on a screw. Therefore, the two heat exchange tube groups can be screwed together.

[0062] Of course, all heat exchange units can also be composed of two heat exchange tube groups. This embodiment is only an example of the composition of the internal heat exchange unit 4, but it is not limited to this. Those skilled in the art can change it according to actual conditions as long as it can achieve the same technical effect.

[0063] Furthermore, if Figure 4 and Figure 5 As shown, the coiling radius R of the first spiral tube 411 gradually decreases along the coiling direction of the first spiral tube 411. In addition, in this embodiment, the coiling radius R of the first spiral tube 411 is smallest at the first end of the first heat exchange tube group 41, and is largest at the second end of the first heat exchange tube group 41.

[0064] In this embodiment, the first end of one first heat exchange tube group 41 is screwed into the first end of the other first heat exchange tube group 41 along the coiling gap D, thereby forming the inner heat exchange unit 4. Because one first heat exchange tube group 41 needs to be screwed into the other first heat exchange tube group 41, the coiling gap D of the two first heat exchange tube groups 41 needs to be set to the same. During the screwing process, the two first heat exchange tube groups 41 continue to rotate until they completely overlap, thereby forming a spiral cross structure.

[0065] With this arrangement, the embodiment of the present invention gradually reduces the coiling radius R of the first spiral tube 411 along the coiling direction of the first spiral tube 411, and then relatively rotates and nests the two heat exchange tube groups, so that the two heat exchange tube groups spirally intersect. Compared with the prior art method of simply nesting two heat exchange tubes with different inner diameters, this structural arrangement can significantly increase the overall length of the first spiral tube 411 located in the inner heat exchange unit 4 within the same accommodating cavity space. At the same time, the coiling gap D of the outer heat exchange unit 5 can be appropriately increased, thereby minimizing the length difference between the inner and outer first spiral tubes 411, thereby making the heat exchange degree inside and outside the shell and tube heat exchanger uniform. At the same time, since the overall length of the first spiral tube 411 located in the inner heat exchange unit 4 is increased within the same accommodating cavity space, the heat transfer coefficient of the shell and tube heat exchanger is improved, thereby improving the heat transfer capacity of the shell and tube heat exchanger. In addition, the two heat exchange tube groups in each heat exchange cylinder are spirally crossed, and the coiling radius R at both ends of the heat exchange tube group is different, which can significantly improve the turbulence effect during heat exchange and further improve the heat exchange efficiency of the shell and tube heat exchanger.

[0066] Furthermore, in an optional embodiment, in two adjacent heat exchange units, the coil gap D of the outer heat exchange unit 5 is larger than the coil gap D of the inner heat exchange unit 4. In other words, the coil gap D of the heat exchange unit located relatively outer is larger than the coil gap D of the heat exchange unit located relatively inner.

[0067] Since the coiling radius R of the spiral tube in the outer heat exchange unit 5 is significantly greater than the coiling radius R of the spiral tube in the inner heat exchange unit 4, if the coiling gap D of the spiral tubes in the inner and outer heat exchange units 5 is set to be the same, the length of the spiral tube in the outer heat exchange unit 5 will inevitably be greater than the length of the spiral tube in the inner heat exchange unit 4. Therefore, the coiling gap D of the spiral tube in the outer heat exchange unit 5 needs to be adjusted so that the coiling gap D of the outer heat exchange unit 5 is greater than the coiling gap D of the inner heat exchange unit 4. The specific adjustment value is not limited in this embodiment, and those skilled in the art can make judgments based on actual conditions to ensure that the lengths of the spiral tubes in the inner and outer heat exchange units 5 are similar, thereby ensuring a relatively balanced heat exchange capacity for each spiral tube.

[0068] With such an arrangement, since the length of the spiral tube in the inner heat exchange unit becomes longer and the coiling radius R of the spiral tube in the outer heat exchange unit is large, the length of the spiral tube in the outer heat exchange unit itself is very long. Therefore, in order to reduce the length difference between the spiral tubes in the inner and outer heat exchange units 5, the coiling gap D of the outer heat exchange unit 5 can be appropriately increased, thereby reducing the length difference between the inner and outer spiral tubes as much as possible, thereby making the heat exchange degree inside and outside the shell and tube heat exchanger uniform.

[0069] Furthermore, in an optional embodiment, as Figure 9 and Figure 11 As shown, the tank body 1 is provided with two heat exchange units, namely the inner heat exchange unit 4 and the outer heat exchange unit 5, and the inner heat exchange unit 4 is nested in the outer heat exchange unit 5. Of course, this embodiment is merely an example of the number of heat exchange units, but is not intended to be limiting. Those skilled in the art can adjust the number of heat exchange units according to actual conditions, for example, to three or four layers, etc., as long as the same technical effect can be achieved.

[0070] Furthermore, in an optional embodiment, as Figure 8 As shown, the external heat exchange unit 5 is composed of a second heat exchange tube group 51, which includes a plurality of second spiral tubes 511. The plurality of second spiral tubes 511 are arranged closely side by side in the horizontal direction. The horizontal direction is perpendicular to the winding direction of the second spiral tubes 511. In this embodiment, two second spiral tubes 511 may be provided.

[0071] When the plurality of second spiral tubes 511 are coiled together, the coiling radius R of the second spiral tube 511 located relatively on the inner side is smaller than the coiling radius R of the second spiral tube 511 located relatively on the outer side. Furthermore, the coiling radius R of each second spiral tube 511 remains constant along the coiling direction.

[0072] Of course, this embodiment is only an example to illustrate the number of second spiral tubes 511 in the heat exchange tube group, but it is not limited to this. For example, it can also be three, four, five, etc. Those skilled in the art can change it according to actual conditions as long as it can achieve the same technical effect.

[0073] Furthermore, as another optional implementation, Figure 10 As shown, the external heat exchange unit 5 is composed of a third heat exchange tube group 52, which includes a plurality of third spiral tubes 521. The plurality of third spiral tubes 521 are arranged side by side and closely adjacent to each other in the coiling direction. In this embodiment, two third spiral tubes 521 may be provided. When the plurality of third spiral tubes 521 are coiled together, the coiling radius R of each third spiral tube 521 remains constant along the coiling direction.

[0074] That is to say, in this embodiment, the outer heat exchange unit 5 is composed of only a single heat exchange tube group, not the spiral cross structure in the above embodiment, and the inner heat exchange unit 4 can be directly inserted into the outer heat exchange unit 5.

[0075] Furthermore, in an optional embodiment, as Figure 9 and Figure 11 As shown, the tank body 1 further includes an inlet pipe 2 and an outlet pipe 3.

[0076] Specifically, in this embodiment of the present invention, an inlet pipe 2 is disposed at the edge of the tank body 1 and communicates with the accommodating cavity. An outlet pipe 3 is disposed in the center of the tank body 1 and communicates with the accommodating cavity. The outlet pipe 3 corresponds to the arrangement of the heat exchange unit. In this embodiment of the present invention, the inlet pipe 2 can be used to introduce high-temperature, high-pressure gas, which then passes through the double-tube heat exchanger for internal heat exchange before being discharged as high-pressure liquid through the outlet pipe 3.

[0077] Furthermore, in an optional embodiment, as Figure 12 As shown, the double-tube heat exchanger further includes a spoiler 6 , which is at least arranged in the gaseous region of the tank body 1 .

[0078] In this configuration, the present invention provides spoilers 6 in the gaseous region of the heat exchange unit. Because gaseous heat transfer performance is relatively poor and its flow characteristics differ from those of liquids, the addition of spoilers 6 can further promote gas turbulence, enhance heat exchange between the gas and the walls of the heat exchange unit, and thus more effectively improve heat exchange efficiency.

[0079] Of course, the spoiler 6 can also be set at other positions in the tank body 1. This embodiment only illustrates the setting method of the spoiler 6, but does not limit it. Those skilled in the art can make changes according to actual conditions as long as the same technical effect can be achieved.

[0080] Furthermore, in an optional embodiment, as Figure 13 As shown, the spoiler 6 is correspondingly embedded in the winding gap D.

[0081] In this way, the embodiment of the utility model embeds the spoiler 6 in the winding gap D, eliminating the need for additional fixings on the heat exchange unit, making it easier for technicians to install the spoiler 6 and improving work efficiency to a certain extent.

[0082] Furthermore, in the embodiment of the present invention, the spoiler 6 and the heat exchange unit can be fixedly connected or detachably connected. For the fixed connection, welding, bonding, etc. can be used. For the detachable connection, a snap-fit ​​or slot method can be used for fixation.

[0083] The following examples illustrate detachable connection methods. When using clips and slots for fastening, additional clips can be provided around the edges of the heat exchange unit. Those skilled in the art can vary the number of clips to one, two, three, four, etc., depending on actual circumstances. Slots that cooperate with the clips are then provided on the spoiler 6 at locations corresponding to the clips. The clips on the heat exchange unit are then directly inserted into the slots on the spoiler 6, thereby connecting the heat exchange unit to the spoiler 6.

[0084] Of course, this embodiment is only an example of a fixed connection method and a detachable connection method, but it does not limit this. Those skilled in the art can make changes according to actual conditions as long as the same technical effect can be achieved.

[0085] Furthermore, in an optional embodiment, as Figure 12 and Figure 13 As shown, the spoiler 6 is in a spiral strip structure and extends along the winding gap D of the heat exchange unit.

[0086] In this way, the embodiment of the utility model arranges the spoiler 6 into a spiral strip structure so that the gas can flow along the winding manner of the heat exchange unit, thereby increasing the contact area between the gas and the heat exchange unit and further improving the heat exchange efficiency of the sleeve heat exchanger.

[0087] Furthermore, in an optional embodiment, the spoiler 6 is made of a thermally conductive material and is tightly connected to the heat exchange unit. In the embodiment of the present utility model, the thermally conductive material can be carbon steel, stainless steel, copper, or copper alloy. Of course, this embodiment is merely an example of the type of thermally conductive material and is not intended to be limiting. Those skilled in the art may modify the material based on actual conditions, as long as the same technical effect is achieved.

[0088] In this way, the embodiment of the utility model sets the spoiler 6 to a heat-conducting material, thereby further increasing the heat exchange area on the basis of the existing heat exchange area of ​​the heat exchange unit, thereby increasing the contact area between the gas and the heat exchange unit, and further improving the heat exchange efficiency of the sleeve heat exchanger.

[0089] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A double-tube heat exchanger, characterized in that: include: Tank (1); A plurality of heat exchange units are arranged in the tank body (1); the heat exchange units are cylindrical in structure, and a through hole (7) is provided inside the heat exchange units; The plurality of heat exchange units are nested in sequence, that is, in two adjacent heat exchange units, the inner heat exchange unit (4) is inserted into the through hole (7) of the outer heat exchange unit (5); the inner heat exchange unit (4) is composed of two first heat exchange tube groups (41), each first heat exchange tube group (41) includes a plurality of first spiral tubes (411), and the plurality of first spiral tubes (411) are arranged side by side in a coiling direction; when coiling, each first heat exchange tube group (41) forms a coiling gap (D); Along the coiling direction, the coiling radius (R) of the first spiral tube (411) gradually decreases; at the first end of the first heat exchange tube group (41), the coiling radius (R) of the first spiral tube (411) is the smallest, and at the second end of the first heat exchange tube group (41), the coiling radius (R) of the first spiral tube (411) is the largest; The first end of one of the first heat exchange tube groups (41) is screwed into the first end of the other first heat exchange tube group (41) along the winding gap (D) to form the internal heat exchange unit (4).

2. The double-tube heat exchanger according to claim 1, characterized in that: In two adjacent heat exchange units, the coil gap (D) of the outer heat exchange unit (5) is larger than the coil gap (D) of the inner heat exchange unit (4).

3. The double-tube heat exchanger according to claim 2, characterized in that: Two heat exchange units are provided in the tank body (1), namely the internal heat exchange unit (4) and the external heat exchange unit (5).

4. The double-tube heat exchanger according to claim 3, characterized in that: The external heat exchange unit (5) is composed of a second heat exchange tube group (51), the second heat exchange tube group (51) includes a plurality of second spiral tubes (511), and the plurality of second spiral tubes (511) are arranged side by side in a horizontal direction; the horizontal direction is perpendicular to the winding direction of the second spiral tubes (511); When a plurality of second spiral tubes (511) are coiled together, the coiling radius (R) of the second spiral tube (511) located relatively on the inner side is smaller than the coiling radius (R) of the second spiral tube (511) located relatively on the outer side; and along the coiling direction, the coiling radius (R) of each second spiral tube (511) remains unchanged.

5. The double-tube heat exchanger according to claim 3, characterized in that: The external heat exchange unit (5) is composed of a third heat exchange tube group (52), and the third heat exchange tube group (52) includes a plurality of third spiral tubes (521). In the winding direction, the plurality of third spiral tubes (521) are arranged side by side and closely adjacent to each other. When a plurality of third spiral tubes (521) are coiled together, the coiling radius (R) of each third spiral tube (521) remains unchanged along the coiling direction.

6. The double-tube heat exchanger according to any one of claims 1 to 5, characterized in that: The tank body (1) further comprises: An inlet pipe (2) is arranged at the edge of the tank body (1) and communicates with the accommodating cavity inside the tank body; An outlet pipe (3) is arranged in the central area of ​​the tank body (1) and is in communication with the accommodating cavity; the outlet pipe (3) is arranged correspondingly to the heat exchange unit.

7. The double-tube heat exchanger according to claim 6, characterized in that: The double-tube heat exchanger also includes: The spoiler (6) is arranged at least in the gaseous region of the heat exchange unit.

8. The double-tube heat exchanger according to claim 7, characterized in that: The spoiler (6) is correspondingly embedded in the winding gap (D).

9. The double-tube heat exchanger according to claim 7 or 8, characterized in that: The spoiler (6) is in a spiral strip structure and extends along the winding gap (D) of the heat exchange unit.

10. The double-tube heat exchanger according to claim 7 or 8, characterized in that: The spoiler (6) is made of a heat-conducting material, and the spoiler (6) is tightly connected to the heat exchange unit.

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