Center cylinder winding pipe structure and winding pipe heat exchanger

Abstract

The utility model provides a central cylinder winding pipe structure and a winding pipe heat exchanger, and relates to the technical field of heat exchangers, the central cylinder winding pipe structure comprises an inner cylinder, an outer cylinder, a first layer winding pipe and a second layer winding pipe, the outer cylinder sleeves the outer side of the inner cylinder and is fixed relative to the inner cylinder, a first mounting cavity is formed between the outer cylinder and the inner cylinder, and a second mounting cavity is formed between the outer cylinder and the inner cylinder. A second mounting cavity is formed in the outer part of the outer-layer cylinder, and the first mounting cavity is communicated with the second mounting cavity. The inner barrel and the outer barrel are arranged, the first mounting cavity and the second mounting cavity are formed, bearing of the first-layer winding pipe and the second-layer winding pipe is achieved, namely the outer barrel is arranged through the gap between the two layers of winding pipes, thickening and structural strengthening design of the inner barrel are not needed, and a support of the outer-layer winding pipe does not need to be lengthened and strengthened; the occupied space in the heat exchanger is reduced, the density of wound pipes can be increased, and the heat exchanger has a better heat exchange effect under the same size.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a central tube winding structure and a wound tube heat exchanger. Background Technology

[0002] Spiral wound tube heat exchangers offer unparalleled advantages over ordinary shell-and-tube heat exchangers. They have a wide applicable temperature range, are resistant to thermal shock, self-eliminate thermal stress, and are highly compact. Due to their unique structure, the flow field is fully developed, eliminating dead zones. Notably, by using multiple tubes (single tube in the shell side), they can simultaneously exchange heat from multiple fluids within a single unit. Spiral wound tube heat exchangers are highly efficient and compact, not only utilizing waste heat but also playing a significant role in energy conservation and environmental protection. For example, a heat pipe-type spiral wound tube heat exchanger with publication number CN116067208A uses a central cylinder as the intermediate medium channel and encases the cold flow heat exchange tubes inside the hot flow heat exchange tubes, preventing cross-contamination between the cold and hot flows.

[0003] However, when the shell-side fluid and multiple tubes of a wound tube heat exchanger are subjected to multi-level segmented heat exchange, multiple layers of wound tubes are usually required. This multi-layer wound tube design needs to take into account the support stiffness of the central cylinder to avoid deformation of the central cylinder under uneven loads. Usually, the central cylinder is thickened or other reinforcing structures are set. In addition, for the overall rigid support of the wound tubes, supports need to be arranged according to the number of wound tube layers. The more layers there are, the higher the strength of the supports needs to be. The higher the strength of the supports, the larger the space they occupy. At the same time, the supports will occupy additional space for the wound tubes, affecting the heat exchange effect per unit space. Utility Model Content

[0004] In view of this, the present invention proposes a central cylinder winding tube structure and a wound tube heat exchanger. By setting an inner cylinder and an outer cylinder, and forming a first installation chamber and a second installation chamber, the first layer of winding tubes and the second layer of winding tubes are supported. That is, the outer cylinder is set by using the gap between the two layers of winding tubes, without the need to thicken the inner cylinder or strengthen its structure, and without the need to lengthen or strengthen the support for the outer layer of winding tubes. This reduces the space occupied in the heat exchanger, increases the winding tube density, and makes it have a better heat exchange effect in the same volume.

[0005] The technical solution of this utility model is implemented as follows:

[0006] On the one hand, this utility model provides a central cylinder winding structure, including an inner cylinder, an outer cylinder, a first layer of winding tubes, and a second layer of winding tubes, wherein,

[0007] An outer sleeve is fitted on the outside of the inner sleeve and fixed relative to the inner sleeve. A first mounting chamber is formed between the outer sleeve and the inner sleeve, and a second mounting chamber is provided outside the outer sleeve. The first mounting chamber and the second mounting chamber are connected.

[0008] The first layer of tubing is disposed in the first mounting chamber and surrounds the outside of the inner cylinder;

[0009] The second layer of tubing is disposed in the second mounting chamber and surrounds the outside of the outer tube.

[0010] Based on the above technical solutions, preferably, the outer cylinder has a flow hole, which is used to connect the first installation chamber and the second installation chamber.

[0011] More preferably, the number of flow holes is multiple, and they are arranged around the outer cylinder.

[0012] Based on the above technical solutions, preferably, it also includes a flange, wherein one end of the inner cylinder and the outer cylinder are both fixed to the flange, and one end of the first layer of winding pipe and the second layer of winding pipe both pass through the flange and are fixed to the flange.

[0013] More preferably, the outer cylinder includes a first cylinder section, a conical cylinder section, and a second cylinder section, the first cylinder section, the conical cylinder section, and the second cylinder section are located on the same center line and are fixed in sequence, the second cylinder section is fixedly connected to the flange, and the radius of the second cylinder section is smaller than that of the first cylinder section.

[0014] More preferably, the second layer of the winding tube includes a circumferential section, a variable diameter section, and a straight insertion section connected in sequence. The circumferential section, the variable diameter section, and the straight insertion section are respectively disposed on the outer side of the first cylindrical section, the conical section, and the second cylindrical section. The straight insertion section is parallel to the center line of the second cylindrical section and is fixed to the flange.

[0015] Based on the above technical solutions, preferably, the inner cylinder and the outer cylinder are arranged concentrically.

[0016] Based on the above technical solutions, preferably, a connector is also included, which is disposed in the first mounting chamber and its two ends are fixed to the inner cylinder and the outer cylinder, respectively.

[0017] More preferably, the number of the connectors is multiple and divided into multiple groups, with each group of connectors located on a different plane, and each group of connectors surrounding the inner cylinder.

[0018] On the other hand, this utility model provides a wound tube heat exchanger, including the above-mentioned central tube wound tube structure.

[0019] The central tube winding structure and wound tube heat exchanger of this utility model have the following advantages over the prior art:

[0020] (1) By setting an inner cylinder and an outer cylinder, and forming a first installation chamber and a second installation chamber, the first layer of coiled tubes and the second layer of coiled tubes can be supported. That is, the outer cylinder is set by using the gap between the two layers of coiled tubes. There is no need to thicken the inner cylinder and strengthen the structure. There is no need to lengthen and strengthen the support of the outer coiled tubes. This reduces the space occupied in the heat exchanger and can increase the coiled tube density, so that it has a better heat exchange effect in the same volume.

[0021] (2) By setting the outer cylinder as a first cylinder section, a conical cylinder section and a second cylinder section, the first cylinder section, the conical cylinder section and the second cylinder section are located on the same center line and are fixed in sequence, and the radius of the second cylinder section is set to be smaller than that of the first cylinder section, the conical cylinder section is used to compensate for the radius difference between the first cylinder section and the second cylinder section, forming a complete central cylinder structure, achieving a smooth transition, thereby meeting the support stiffness required by the multi-stage tube bundle and the variable cross section setting of the central cylinder, and thus meeting the multi-level segmented heat exchange between the shell-side fluid and the multi-tube side in the wound tube heat exchanger. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of the central cylinder winding tube structure and the wound tube heat exchanger of this utility model.

[0024] Figure 2 This is a side view of the central tube winding structure and the wound tube heat exchanger of this utility model;

[0025] Figure 3 for Figure 2 Cross-sectional view at point AA;

[0026] Figure 4 This is a perspective view of the central tube winding structure and the outer tube of the wound tube heat exchanger of this utility model. Detailed Implementation

[0027] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0028] In recent years, wound tube heat exchangers have shown a trend towards larger and more widespread use. However, the limited bending resistance and stiffness of a single-layer central tube pose a significant constraint on the large-scale manufacturing of wound tube heat exchangers. To address this issue, this embodiment proposes a central tube wound structure.

[0029] like Figure 1-4 As shown, the central tube winding structure of this utility model includes an inner tube 1, an outer tube 2, a first layer winding tube 3, and a second layer winding tube 4.

[0030] The inner cylinder 1 is the innermost central cylinder, and its inner and outer sides are completely separated, allowing flow channels to be formed within the inner cylinder 1.

[0031] The outer cylinder 2 is sleeved on the outside of the inner cylinder 1 and fixed relative to the inner cylinder 1. A first installation chamber is formed between the outer cylinder 2 and the inner cylinder 1, and a second installation chamber is provided on the outside of the outer cylinder 2. The first installation chamber and the second installation chamber are connected. The inner diameter of the outer cylinder 2 is larger than the outer diameter of the inner cylinder 1, and the space between the inner cylinder 1 and the outer cylinder 2 forms a first installation chamber for mounting the winding tube. Correspondingly, the first installation chamber is also cylindrical in shape.

[0032] The first layer of the winding tube 3 is disposed in the first installation chamber and surrounds the outside of the inner cylinder 1. The radius of the first layer of the winding tube 3 is greater than the outer diameter of the inner cylinder 1 and less than the inner diameter of the outer cylinder 2, so as not to interfere with the inner cylinder 1 and the outer cylinder 2. The first layer of the winding tube 3 can be installed by setting a bracket on the inner cylinder 1, or by setting a bracket between the inner cylinder 1 and the outer cylinder 2. However, considering that the installation needs to be carried out from the inside to the outside during assembly, it is preferable to set the bracket on the inner cylinder 1.

[0033] The second layer of the winding tube 4 is disposed in the second mounting chamber and surrounds the outside of the outer layer cylinder 2. The radius of the second layer of the winding tube 4 is larger than that of the outer layer cylinder 2. Similarly, the second layer of the winding tube 4 is preferably installed by a bracket disposed on the outer layer cylinder 2.

[0034] In existing technologies, the coiled tubes surrounding the central cylinder are themselves multi-layered. Here, "multi-layered" refers to the coiling radius gradually increasing from the inside to the outside. In this embodiment, a radius threshold is set. Coiled tubes with a coiling radius smaller than the radius threshold are classified as the first layer of coiled tubes 3, and coiled tubes with a coiling radius larger than the radius threshold are classified as the second layer of coiled tubes 4. That is, the multi-layered coiled tubes are divided into two parts, and the spacing between two adjacent coiled tubes is increased at the coiling radius to set the outer cylinder 2. By setting the inner cylinder 1 and the outer cylinder 2, and forming the first installation chamber and the second installation chamber, the first layer of coiled tubes 3 and the second layer of coiled tubes 4 are supported. That is, the outer cylinder 2 is set by using the gap between the two layers of coiled tubes. There is no need to thicken or strengthen the inner cylinder 1, and there is no need to lengthen or strengthen the support of the outer coiled tubes. This reduces the space occupied in the heat exchanger and can increase the coiling density, so that it has a better heat exchange effect in the same volume.

[0035] It should be noted that this embodiment only uses two layers of central tubes as an example for illustration. The core idea of ​​this solution is to divide the multi-layer winding tubes and set an additional outer tube 2. The number of outer tubes 2 is not limited. It can be one outer tube 2 or multiple outer tubes 2. The number of outer tubes 2 needs to be adjusted and selected according to the actual heat exchanger requirements.

[0036] In addition, in order to maximize the arrangement space of the coiled tube and uniformly increase its heat exchange capacity, the inner cylinder 1 and the outer cylinder 2 are arranged concentrically.

[0037] In a preferred embodiment, the outer cylinder 2 has a flow-through hole 201, which is used to connect the first mounting chamber and the second mounting chamber. By providing the flow-through hole 201, the heat exchange medium can flow between the first mounting chamber and the second mounting chamber. This embodiment is only used in scenarios where the first layer of coiled tube 3 and the second layer of coiled tube 4 need to exchange heat synchronously. However, for some special scenarios, such as when the heat exchange temperature of the first layer of coiled tube 3 is higher or lower than that of the second layer of coiled tube 4, forming a staged heat exchange inside and outside, the flow-through hole 201 can be removed to separate the first mounting chamber and the second mounting chamber.

[0038] Furthermore, there are multiple flow holes 201, which are arranged around the outer cylinder 2. When the first installation chamber and the second installation chamber need to be connected for the flow of medium, multiple flow holes 201 can be opened to increase the flow area of ​​the medium. In this embodiment, the flow holes 201 are divided into multiple groups, and each group is located on a different horizontal plane. Each group of flow holes 201 is arranged around the outer cylinder 2. In addition, adjacent groups of flow holes 201 are staggered to reduce the impact on the overall rigidity of the outer cylinder 2.

[0039] In a preferred embodiment, a flange 5 is also provided. One end of the inner cylinder 1 and the outer cylinder 2 are both fixed to the flange 5. One end of the first layer of coiled tube 3 and the second layer of coiled tube 4 both pass through the flange 5 and are fixed to the flange 5. For some staged heat exchangers, the flange 5 is needed to divide different heat exchange sections. In this solution, it is used to support the outer cylinder 2, and the end of the outer cylinder 2 is fixed to the entire heat exchanger through the flange 5. At the same time, the flange 5 can also serve to fix the end of the coiled tube.

[0040] With the increasing application of wound tube heat exchangers, multi-stage coupled heat exchange is gradually gaining prominence. The variable cross-section central cylinder model is suitable for multi-level, segmented heat exchange between the shell-side fluid and multiple tubes in wound tube heat exchangers. The heat exchange capacity varies between each stage of the tube bundle, the length and number of heat exchange tubes differ, and the shell side also has a variable cross-section with varying diameters for each segment. The required support stiffness for the multi-stage tube bundle varies, meaning the required diameter of the central cylinder for the heat exchange tubes also differs. This necessitates a variable cross-section central cylinder design at the center of the entire shell side. Therefore, in this embodiment, the outer cylinder 2 includes a first cylinder section 21, a conical cylinder section 22, and a second cylinder section 23. The first cylinder section... 21. The conical section 22 and the second section 23 are located on the same center line and are fixed in sequence. The second section 23 is fixedly connected to the flange 5, and the radius of the second section 23 is smaller than that of the first section 21. The conical section 22 is used to compensate for the radius difference between the first section 21 and the second section 23, forming a complete central cylinder structure and thus achieving a smooth transition. For central cylinders that do not require diameter changes, the outer cylinder 2 can be connected to the flange 5 in a straight-up-down manner. It should be noted that this structure is suitable for small diameter to large diameter and large diameter to small diameter changes.

[0041] In addition, for cases where the shell-side cross-section of the heat exchanger differs significantly, simply changing the outer cylinder 2 will affect the passage of the coiled tube between the inner cylinder 1 and the outer cylinder 2. In this case, the inner cylinder 1 also needs to adopt a conical design similar to that of the outer cylinder 2.

[0042] In order to reduce the impact of the coiled tubes on the shell-side cross-section of the heat exchanger when the shell-side cross-sections differ significantly, the second layer of coiled tubes 4 includes a coiled section 41, a variable diameter section 42, and a straight insertion section 43 connected in sequence. The coiled section 41, the variable diameter section 42, and the straight insertion section 43 are respectively located on the outside of the first cylindrical section 21, the conical section 22, and the second cylindrical section 23. The straight insertion section 43 is parallel to the center line of the second cylindrical section 23 and is fixed to the flange 5.

[0043] The variable diameter section 42 and the surrounding section 41 are respectively arranged around the first cylinder section 21 and the conical cylinder section 22. During the winding process on the conical cylinder section 22, the section gradually tightens, and the distance between the outer cylinder 2 and the heat exchanger shell gradually decreases. At this time, the variable diameter section 42 will become a straight insertion section 43, which is perpendicular to the flange 5 and passes between the inner cylinder 1 and the outer cylinder 2. Correspondingly, when the inner cylinder 1 is also set as a variable cross section, the radius of the inner cylinder 1 and the outer cylinder 2 near the flange gradually decreases, and the distance between them gradually decreases. At this time, the first layer of winding pipe 3 also needs to adopt this setting method.

[0044] In this embodiment, a connector 6 is also provided. The connector 6 is disposed in the first mounting chamber and its two ends are fixed to the inner cylinder 1 and the outer cylinder 2 respectively. The inner cylinder 1 and the outer cylinder 2 are connected and fixed in this way to further improve their mechanical stability.

[0045] Specifically, there are multiple connectors 6, which are divided into multiple groups. Each group of connectors 6 is located on a different plane, and each group of connectors 6 surrounds the inner cylinder 1, so that the inner cylinder 1 and the outer cylinder 2 are subjected to more balanced pressure, effectively reducing the possibility of bending caused by excessive local pressure.

[0046] The spiral wound tube heat exchanger of this utility model includes the above-mentioned central tube winding structure, and specifically also includes a shell. A flange 5 is fixed to the end of the shell. The shell can be a segmented shell. The end of the shell includes the connection points of each segment of the segmented shell. By setting the central tube winding structure inside the shell, the spiral wound tube heat exchanger of this embodiment can be formed.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A central tube around pipe construction, characterized by: It comprises an inner cylinder (1), an outer cylinder (2), a first layer of winding pipe (3) and a second layer of winding pipe (4), wherein, The outer cylinder (2) is sleeved on the outside of the inner cylinder (1) and is fixed relative to the inner cylinder (1), a first mounting chamber is formed between the outer cylinder (2) and the inner cylinder (1), and a second mounting chamber is arranged on the outside of the outer cylinder (2), the first mounting chamber and the second mounting chamber are in communication; The first layer of winding pipe (3) is arranged in the first mounting chamber and surrounds the outside of the inner cylinder (1); The second layer of winding pipe (4) is arranged in the second mounting chamber and surrounds the outside of the outer cylinder (2).

2. The center post pipe-in-pipe structure of claim 1, wherein: The outer cylinder (2) is provided with overflow holes (201) for communicating the first mounting chamber and the second mounting chamber.

3. The center post pipe-in-pipe structure of claim 2, wherein: The number of overflow holes (201) is multiple and arranged around the outer cylinder (2).

4. The center post pipe-in-pipe structure of claim 1, wherein: It also comprises a flange (5), one end of the inner cylinder (1) and the outer cylinder (2) is fixed on the flange (5), one end of the first layer of winding pipe (3) and the second layer of winding pipe (4) penetrates the flange (5) and is fixed with the flange (5).

5. The center post pipe-in-pipe construction of claim 4, wherein: The outer cylinder (2) comprises a first cylinder segment (21), a tapered cylinder segment (22) and a second cylinder segment (23), the first cylinder segment (21), the tapered cylinder segment (22) and the second cylinder segment (23) are located on the same center line and are fixed in sequence, the second cylinder segment (23) is fixedly connected with the flange (5), and the radius of the second cylinder segment (23) is smaller than that of the first cylinder segment (21).

6. The center post pipe-in-pipe structure of claim 5, wherein: The second layer of winding pipe (4) comprises a surrounding segment (41), a variable diameter segment (42) and a straight insertion segment (43) connected in sequence, the surrounding segment (41), the variable diameter segment (42) and the straight insertion segment (43) are arranged on the outside of the first cylinder segment (21), the tapered cylinder segment (22) and the second cylinder segment (23) respectively, the straight insertion segment (43) is parallel to the center line of the second cylinder segment (23) and is fixed with the flange (5).

7. The center post wrap tube structure of claim 1, wherein: The inner cylinder (1) and the outer cylinder (2) are arranged concentrically.

8. The center post wrap tube structure of claim 1, wherein: It also comprises a connecting piece (6) arranged in the first mounting chamber and fixed at both ends with the inner cylinder (1) and the outer cylinder (2).

9. The center post wrap tube structure of claim 8, wherein: The number of connecting pieces (6) is multiple and divided into multiple groups, each group of connecting pieces (6) is located on a different plane, and each group of connecting pieces (6) surrounds the inner cylinder (1).

10. A spiral wound heat exchanger characterized by: It comprises the central cylinder winding pipe structure of any one of claims 1-9. It comprises the central cylinder winding pipe structure of any one of claims 1-9.

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