Heat exchange tube, heat exchange tube cleaning module, heat exchange device and high-temperature heat pump system

Abstract

The utility model relates to a heat exchange tube, a heat exchange tube cleaning module, a heat exchange device and a high-temperature heat pump system, the heat exchange tube comprises a first tube body and a heat exchange structure, and the first tube body is internally provided with a first fluid channel; and the multiple heat exchange structures are sequentially arranged in the circumferential direction of the first pipe body, each heat exchange structure and the outer wall of the first pipe body define a second fluid channel, each heat exchange structure is provided with a plurality of hollowed-out parts, and the hollowed-out parts communicate with the corresponding second fluid channels. According to the heat exchange pipe, the multiple closed second fluid channels can be defined by the multiple heat exchange structures and the outer wall of the first pipe body, heat emitted outwards by the first pipe body can be intercepted, and the time of the heat and the heat exchange working medium in the second fluid channels is prolonged; therefore, the heat exchange contact time between the heat exchange working medium and the outer wall of the first pipe body and the heat exchange structure is prolonged. The hollow part is arranged on the heat exchange structure, so that a heat exchange working medium can conveniently enter and exit from the second fluid channel, and enhanced heat exchange with the outer wall of the first pipe body and the heat exchange structure is realized.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a heat exchange tube, a heat exchange tube cleaning module, a heat exchange device and a high-temperature heat pump system. Background Art

[0002] In the heat exchange device, the heat exchange tube is a core component that plays the role of realizing energy conversion and utilization. Specifically, a working fluid flows inside the heat exchange tube, and another working fluid exists outside the heat exchange tube. The two working fluids realize contact heat exchange through the heat exchange tube, realizing heat transfer between the two working fluids (usually liquid or gaseous).

[0003] In order to improve the heat exchange efficiency of the heat exchange tube, the prior art often sets a plurality of fins or fin pins arranged in a divergent shape on the outside of the heat exchange tube. Since there is an open gap between two adjacent fins or fin pins, the heat on the outer wall of the heat exchange tube is easily dissipated from the open gap, and a large amount of heat cannot be transferred to the fins and fin pins for heat exchange, which is not conducive to extending the heat exchange contact time between the heat exchange tube and the external working medium, and the heat exchange efficiency is low. Utility Model Content

[0004] The present application provides a heat exchange tube, a heat exchange tube cleaning module, a heat exchange device and a high-temperature heat pump system to solve the technical problems in the prior art that the heat exchange contact time between the heat exchange tube and its exterior is short and the heat exchange efficiency is low.

[0005] In a first aspect, the present application provides a heat exchange tube, comprising:

[0006] A first tube body, wherein the first tube body has a first fluid channel inside;

[0007] Heat exchange structure, multiple heat exchange structures are arranged in sequence along the circumference of the first tube body, each heat exchange structure and the outer wall of the first tube body are enclosed to form a second fluid channel, and the heat exchange structure has multiple hollow parts, which are connected to the corresponding second fluid channels.

[0008] Optionally, the cross-sectional shape of the heat exchange structure is a V-shaped, C-shaped or U-shaped structure.

[0009] Optionally, the hollow portion includes a first circulation groove and a second circulation groove, and the plurality of first circulation grooves are arranged on one side or both sides of the length direction of the heat exchange structure; the plurality of second circulation grooves are arranged along the length direction of the heat exchange structure and are arranged opposite to the outer wall of the first tube body.

[0010] Optionally, the heat exchange tube also includes a second tube body, which is sleeved on the outside of the first tube body and the heat exchange structure, and a third fluid channel is formed between the outer wall of the first tube body and the inner wall of the second tube body, and the second fluid channel is connected to the third fluid channel.

[0011] Optionally, the outer wall of the first tube body and the inner wall of the second tube body are connected via a plurality of support members.

[0012] In the second aspect, the present application provides a heat exchange tube cleaning module, including the heat exchange tube provided in the first aspect of the present application, and also including a cleaning liquid tank, wherein the first tube body penetrates the cleaning liquid tank body, and one end of the second tube body is connected to the cleaning liquid tank body.

[0013] Optionally, along the axial direction of the first tube body, at least two second tube bodies are sleeved on the first tube body, and two adjacent second tube bodies are connected through the cleaning liquid tank body.

[0014] Optionally, the inner wall of the cleaning liquid box body has a guide surface extending obliquely downward, and the bottom of the cleaning liquid box body is provided with a cleaning liquid flow port.

[0015] In a third aspect, the present application provides a heat exchange device, including the heat exchange tube provided in the first aspect of the present application;

[0016] Alternatively, it includes the heat exchange tube cleaning module provided in the second aspect of the present application.

[0017] Optionally, the heat exchange device includes a shell, a plurality of heat exchange tubes are arranged inside the shell, and the axial direction of the heat exchange tubes is parallel to the axial direction of the shell; the inside of the shell is used to hold the heat exchange medium, and the shell is provided with a medium flow port;

[0018] The two ends of the shell are respectively provided with a first sealed chamber and a second sealed chamber, and the two ends of the first tube body are respectively connected with the first sealed chamber and the second sealed chamber; the first sealed chamber is provided with a working medium inlet; the second sealed chamber is provided with a working medium outlet.

[0019] Optionally, when the heat exchange device includes a heat exchange tube cleaning module, the working fluid flow port is arranged opposite to the cleaning liquid tank, and the projection of the working fluid flow port on the cleaning liquid tank is located inside the cleaning liquid tank.

[0020] Optionally, when the heat exchange device includes a heat exchange tube cleaning module, at least a portion of the cleaning liquid tank is arranged to extend out of the shell to be connected to the cleaning liquid pipeline.

[0021] Optionally, the bottom of the inner cavity of the second sealing chamber has a groove, and the bottom surface of the groove is connected to the working medium outlet.

[0022] Optionally, tube sheets are provided at both ends of the shell, and a plurality of through holes for connecting the first tube body are provided on the tube sheets.

[0023] In a fourth aspect, the present application provides a high-temperature heat pump system, comprising the heat exchange device provided in the third aspect of the present application, wherein the heat exchange device is provided with a steam outlet.

[0024] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0025] The heat exchange tube provided in the embodiment of the present application can form multiple relatively closed second fluid channels by enclosing multiple heat exchange structures with the outer wall of the first tube body, which can increase the heat exchange area and intercept the heat emitted from the first tube body, increase the time of heat and heat exchange medium in the second fluid channel, thereby improving the heat exchange contact time between the heat exchange medium and the outer wall of the first tube body and the heat exchange structure. The hollow part is set on the heat exchange structure to facilitate the heat exchange medium to enter and exit the second fluid channel, and realize enhanced heat exchange with the outer wall of the first tube body and the heat exchange structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0029] Figure 1 Schematic diagram of the structure of the heat exchange tube provided in the embodiment of the present application Figure 1 ;

[0030] Figure 2 Provided for the embodiments of this application Figure 1 A magnified view of the details of part A;

[0031] Figure 3 A schematic diagram of the first tube body and the heat exchange structure provided in the embodiment of the present application being deployed along the circumference of the first tube body;

[0032] Figure 4 Provided for the embodiments of this application Figure 3 A top view of

[0033] Figure 5 Provided for the embodiments of this application Figure 4 A front view of

[0034] Figure 6 Provided for the embodiments of this application Figure 4 Side view of

[0035] Figure 7Schematic diagram of the structure of the heat exchange tube provided in the embodiment of the present application Figure 2 ;

[0036] Figure 8 Provided for the embodiments of this application Figure 7 A cross-sectional view of

[0037] Fig. 9 Provided for the embodiments of this application Figure 8 A magnified view of the details of part B;

[0038] Fig.10 Provided for the embodiments of this application Figure 8 A detailed enlarged view of part C in the middle;

[0039] Fig.11 Provided for the embodiments of this application Figure 7 A side view of (heat exchange structure not shown);

[0040] Fig.12 A schematic diagram of the structure of the cleaning liquid tank provided in an embodiment of the present application;

[0041] Fig.13 A cross-sectional view of a cleaning liquid tank provided in an embodiment of the present application;

[0042] Fig.14 A bottom view of the cleaning liquid tank provided in an embodiment of the present application;

[0043] Fig.15 A schematic diagram of the structure of a heat exchange device provided in an embodiment of the present application;

[0044] Fig.16 A cross-sectional view of a heat exchange device provided in an embodiment of the present application;

[0045] Fig.17 A schematic diagram of a partial structure of a second sealing chamber provided in an embodiment of the present application;

[0046] Fig.18 Provided for the embodiments of this application Fig.16 A magnified detail of section D.

[0047] Description of reference numerals:

[0048] 1. The first tube body;

[0049] 2. heat exchange structure; 210. first flow slot; 220. second flow slot; 230. heat exchange body;

[0050] 3. The second tube body;

[0051] 4. Support parts;

[0052] 5. Cleaning liquid box; 510. Side plate; 511. Guide surface; 520. Bottom plate; 521. Cleaning liquid flow port; 530. Pipe body mounting plate; 531. Mounting hole; 540. Top plate; 550. Cleaning liquid pipeline;

[0053] 6. Shell; 610. Working medium flow port; 620. Steam outlet;

[0054] 7. First sealing chamber; 710. Working medium inlet;

[0055] 8. Second sealing chamber; 810. Working fluid outlet; 820. Groove;

[0056] 9. Tube sheet;

[0057] 10. Flange. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0059] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0060] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0061] In order to solve the technical problems of short heat exchange contact time between the heat exchange tube and its exterior and low heat exchange efficiency in the prior art, the present application provides a heat exchange tube, a heat exchange tube cleaning module, a heat exchange device and a high-temperature heat pump system, which can form multiple relatively closed second fluid channels through multiple heat exchange structures 2 and the outer wall of the first tube body 1, increase the heat exchange area and intercept the heat dissipated outward from the first tube body, increase the time of the heat exchange medium in the second fluid channel, and thus improve the heat exchange contact time between the heat exchange medium and the outer wall of the first tube body 1 and the heat exchange structure 2. The hollow portion is provided on the heat exchange structure 2, which can facilitate the heat exchange medium to enter and exit the second fluid channel, and achieve enhanced heat exchange with the outer wall of the first tube body 1 and the heat exchange structure 2.

[0062] See also Figures 1 to 18 In a first aspect, an embodiment of the present application provides a heat exchange tube, comprising a first tube body 1 and a heat exchange structure 2. The first tube body 1 has a first fluid channel inside, and a heat conductive medium flows in the first fluid channel and contacts with the inner wall of the first tube body 1, thereby transferring the heat of the heat conductive medium to the first tube body 1 and the heat exchange structure 2.

[0063] A plurality of heat exchange structures 2 are sequentially arranged along the circumference of the first tube body 1, each heat exchange structure 2 and the outer wall of the first tube body 1 enclose a second fluid channel, and a plurality of hollow portions are provided on the heat exchange structure 2, and the hollow portions are connected to the corresponding second fluid channels, such as Figure 1 and Figure 2When the outside of the heat exchange tube is filled with heat exchange medium, the heat exchange medium enters the second fluid channel through the hollow part on the heat exchange structure 2, and the inner wall surface of the heat exchange structure 2 can intercept the heat of the first tube body 1 to prevent the heat from being quickly dissipated. After the heat exchange medium enters the second fluid channel, it can fully exchange heat with the outer wall of the first tube body 1 and the inner wall of the heat exchange structure 2. At the same time, the heat exchange medium outside the heat exchange structure 2 can also exchange heat with the outer wall of the first tube body 1 and the outer wall of the heat exchange structure 2, which is beneficial to increase the heat exchange area and heat exchange efficiency of the heat exchange tube.

[0064] It should be noted that compared with the heat exchange tubes in the prior art, the heat exchange structure 2 of the present application is a semi-closed structure, which is equivalent to adding a connecting plate body on the top of two adjacent fins. Compared with the prior art, not only the heat exchange area of ​​the heat exchange structure 2 is greatly increased, but also a relatively closed second fluid channel is formed by the semi-closed heat exchange structure 2 and the outer wall of the first tube body 1, which can intercept the heat dissipated outward by the first tube body 1 and avoid a large amount of heat from being dissipated from the open gaps between adjacent fins, which is beneficial to improving energy utilization efficiency and heat exchange efficiency.

[0065] In some embodiments of this application, please refer to Figure 3 , Figure 4 and Figure 5 In the circumferential direction of the first tube body 1, a plurality of heat exchange structures 2 are evenly distributed, and the layout distance between two adjacent heat exchange structures 2 is defined as L2. In some preferred embodiments of the present application, when the outer diameter φ2 of the first tube body 1 is 19.05mm, L2 is 0.32mm-0.85mm, which meets the design rules of the heat exchange wing, and when the layout distance between two adjacent heat exchange structures 2 is less than 0.32mm, the spacing between the adjacent heat exchange structures 2 is too small, which is not convenient for processing; and when the layout distance between two adjacent heat exchange structures 2 is greater than 0.85mm, the density of the heat exchange structure 2 on the outer wall of the first tube body 1 is low, the enhanced heat exchange area is insufficient, and the heat exchange capacity of the heat exchange tube is poor. As a specific embodiment of the present application, when the outer diameter φ2 of the first tube body 1 is 19.05mm, L2 is 0.48mm, which can make the spacing between the two adjacent heat exchange structures 2 moderate, easy to manufacture, and make the heat exchange tube have a larger heat exchange area and stronger heat exchange capacity.

[0066] In some embodiments of the present application, in order to intercept the heat dissipated from the outer wall of the first tube body 1 through the heat exchange structure 2, the cross-sectional shape of the heat exchange structure 2 is a V-shaped, C-shaped or U-shaped structure. As a specific embodiment of the present application, the cross-sectional shape of the heat exchange body 230 in the heat exchange structure 2 is as follows: Figure 2 In the U-shaped structure shown, the cross section of the second fluid channel formed by the heat exchange structure 2 and the outer wall of the first tube body 1 is rectangular.

[0067] In the above embodiment, when the heat transfer medium is a high-temperature gaseous medium and the heat exchange medium is a low-temperature liquid medium, the heat exchange medium may boil after heat exchange. To avoid a sharp increase in the air pressure inside the second fluid channel, the steam generated by boiling needs to be output in time through the hollow portion.

[0068] To solve the above problems, in some embodiments of the present application, please refer to Figure 2 and Figure 3 The hollow portion includes a first flow groove 210 and a second flow groove 220. A plurality of first flow grooves 210 are arranged on one or both sides of the length direction of the heat exchange structure 2, so as to facilitate the liquid heat exchange medium to enter the second fluid channel for heat exchange. A plurality of second flow grooves 220 are arranged along the length direction of the heat exchange structure 2 and are arranged opposite to the outer wall of the first tube body 1, so as to facilitate the high-temperature steam and bubbles after heat exchange to quickly overflow from the second flow grooves 220, so as to avoid the high pressure generated inside the second fluid channel due to the boiling of the heat exchange medium, which affects the structural stability of the heat exchange tube.

[0069] It should be noted that the shapes of the first flow groove 210 and the second flow groove 220 can be circular or n-gonal (n is an integer greater than 3). As a specific embodiment of the present application, the first flow groove 210 is a rectangular groove, which is arranged on both sides of the heat exchange body 230; the second flow groove 220 is a circular groove, which is arranged on the top of the heat exchange body 230, such as Figure 2 shown.

[0070] In some embodiments of this application, please refer to Figure 4 and Figure 5 , the diameter of the second circulation groove 220 is defined as φ1, the center distance between two adjacent second circulation grooves 220 is defined as L1, and the distance between the two inner side walls of the heat exchange body 230 is defined as L3. Among them, the value range of L3 is preferably 0.4mm-1.0mm. This is because when the distance between the two inner side walls of the heat exchange body 230 is less than 0.4mm, the heat exchange area at the bottom of the second fluid channel (i.e., on the outer wall of the first tube body 1) will be insufficient, which is not conducive to the direct generation of bubbles on the outer wall of the first tube body 1, and the heat exchange effect is poor; when the distance between the two inner side walls of the heat exchange body 230 is greater than 1.0mm, the density of the side wall of the heat exchange body 230 (equivalent to the heat exchange fins) in the circumferential direction of the first tube body 1 will be low, and the enhanced heat exchange area will be insufficient, resulting in poor heat exchange effect of the first tube body 1 and the heat exchange structure 2 as a whole. Preferably, when the outer diameter φ2 of the first tube body 1 is 19.05 mm, the value of L3 is 0.75 mm, which is conducive to directly generating bubbles on the outer wall of the first tube body 1, ensuring that the heat exchange tube has sufficient enhanced heat exchange area and improving the heat exchange effect.

[0071] The value of φ1 satisfies 0.2L3≤φ1≤0.8L3. This is because, when the diameter of the second circulation groove 220 is less than 0.2L3, the bubbles generated by evaporation heat exchange encounter greater resistance when overflowing from the second circulation groove 220, and are prone to burst prematurely, resulting in poor heat exchange effect; when the diameter of the second circulation groove 220 is greater than 0.8L3, the top of the heat exchange structure 2 is relatively open, and it is not easy to generate bubbles inside the second fluid channel, which also leads to poor heat exchange effect.

[0072] The value of L1 satisfies 1.5φ1≤L1≤6φ1. This is because, when the center distance between two adjacent second flow grooves 220 is less than 1.5φ1, the density of the second flow grooves 220 at the top of the heat exchange body 230 is relatively large, resulting in a large number of second flow grooves 220, making the top of the heat exchange body 230 too open, which will cause the pressure inside the second fluid channel to be released too quickly, which is not conducive to the evaporation of the heat exchange medium, resulting in poor heat exchange effect. When the center distance between two adjacent second flow grooves 220 is greater than 6φ1, there are too few paths for the boiled gaseous heat exchange medium to overflow on the heat exchange structure 2, and the overflow resistance is too large, which will cause the bubbles generated by boiling to rupture prematurely, thereby resulting in poor heat exchange effect.

[0073] In some embodiments of this application, please refer to Figure 5 , the wall thickness of the heat exchange body 230 in the heat exchange structure 2 is defined as W1, and the height of the heat exchange structure 2 is defined as H1. Among them, the value range of W1 is preferably 0.05mm-0.35mm, because when the wall thickness of the heat exchange body 230 is less than 0.05mm, the structure of the heat exchange body 230 is too fragile and easy to be damaged; and when the wall thickness of the heat exchange body 230 is greater than 0.35mm, the heat exchange body 230 will be too thick, not only the heat transfer resistance is too large, but also the bottom area of ​​the evaporation cavity (i.e. the bottom area of ​​the second fluid channel) will be indirectly reduced. Since the bottom of the evaporation cavity is located on the outer wall of the first tube body 1, the heat exchange capacity of this part is relatively strong. If the bottom area is reduced, the evaporation heat exchange intensity of the heat exchange medium inside the second fluid channel will be reduced.

[0074] The value range of H1 is preferably 0.3mm-1.2mm. This is because when the height of the heat exchange structure 2 is less than 0.3mm, the enhanced heat exchange area of ​​the heat exchange structure 2 will be insufficient; and when the height of the heat exchange structure 2 is greater than 1.2mm, the height of the heat exchange structure 2 will be too high, and the time for the bubbles to move from the outer wall of the first tube body 1 to the second circulation groove 220 will be too long, and the possibility of being disturbed by the heat exchange medium inside the second fluid channel is relatively high, which will cause the bubbles to rupture prematurely, resulting in reduced heat exchange effect.

[0075] As a specific embodiment of the present application, when the outer diameter φ2 of the first tube body 1 is 19.05 mm, the value of W1 is preferably 0.2 mm, and the value of H1 is preferably 0.6 mm, which is beneficial to ensure the structural strength and heat exchange effect of the heat exchange structure 2.

[0076] In the above embodiment, when liquid water is used as the heat exchange medium, since the water contains substances such as calcium ions and magnesium ions, dirt will form on the outer wall of the first tube body 1 and the surface of the heat exchange structure 2 after the water evaporates. If this continues for a long time, the heat exchange capacity of the heat exchange tube will be greatly reduced, and even the tube body of the heat exchange tube will be corroded.

[0077] In order to solve the above problems, in some embodiments of the present application, the heat exchange tube also includes a second tube body 3, which is sleeved on the outside of the first tube body 1 and the heat exchange structure 2, and a third fluid channel is formed between the outer wall of the first tube body 1 and the inner wall of the second tube body 3, and the second fluid channel is connected to the third fluid channel to facilitate the flow of heat exchange medium and cleaning liquid between the first tube body 1 and the second tube body 3.

[0078] It should be noted that when the heat exchange tube is working normally, part of the heat exchange medium can enter the second fluid channel through the third fluid channel to exchange heat with the outer wall of the first tube body 1 and the inner wall of the heat exchange structure 2, and other heat exchange medium can exchange heat with the outer wall of the first tube body 1 and the outer wall of the heat exchange structure 2 inside the third fluid channel. The steam generated after the heat exchange can enter the third fluid channel and then overflow from both ends of the second tube body 3, as shown in Figure 7.

[0079] When the heat exchange tube needs to be cleaned, the second tube body 3 surrounds the first tube body 1 and the outside of the heat exchange structure 2 to form a relatively closed cleaning space. The high-pressure cleaning liquid enters from one end of the third fluid channel and soaks and rinses the outer wall of the first tube body 1, the outer wall of the heat exchange structure 2 and the second fluid channel. After the rinsing is completed, the rinsing liquid carries the fallen dirt and flows out from the other end of the third fluid channel, which is conducive to ensuring the cleanliness and heat exchange capacity of the heat exchange tube.

[0080] In some embodiments of this application, please refer to Figure 3 , Figure 4 and Figure 6, the length of the first circulation groove 210 is defined as L4, the layout distance between two adjacent first circulation grooves 210 is defined as L5, and the height of the first circulation groove 210 is defined as H2. Among them, the value range of L4 is preferably 0.2mm-0.8mm. This is because when the length of the first circulation groove 210 is less than 0.2mm, when the cleaning liquid flows along the circumference of the first tube body 1, the flow rate is small, and the cleaning effect on the first tube body 1 and the heat exchange structure 2 is poor. When the length of the first circulation groove 210 is greater than 0.8mm, it is not conducive to the bubbles generated on the outer wall of the first tube body 1 to quickly overflow to the second circulation groove 220, which will weaken the evaporation heat exchange effect of the heat exchange medium.

[0081] The value range of H2 is preferably 1.1L4≤H2≤1.5L4. This is because when the height of the first circulation groove 210 is less than 1.1L4, the size of the first circulation groove 210 is small. When the cleaning liquid flows along the circumference of the first tube body 1, the flow rate is small, and the cleaning effect on the first tube body 1 and the heat exchange structure 2 is poor. When the height of the first circulation groove 210 is greater than 1.5L4, it is not conducive to the bubbles generated on the outer wall of the first tube body 1 to quickly overflow to the second circulation groove 220, which will weaken the evaporation heat exchange effect of the heat exchange medium.

[0082] The value range of L5 is preferably 2.2L4≤L5≤10L4. This is because, when the arrangement distance between two adjacent first circulation grooves 210 in the axial direction of the first tube body 1 is less than 2.2L4, it means that the number of rectangular grooves at the bottom of the heat exchange structure 2 is too large, which is not conducive to the bubbles formed on the outer wall of the first tube body 1 to move upward quickly and overflow from the second circulation grooves 220, which will weaken the evaporation and heat exchange effect of the heat exchange medium; when the arrangement distance between two adjacent first circulation grooves 210 in the axial direction of the first tube body 1 is greater than 10L4, it means that the number of rectangular grooves on both sides of the heat exchange structure 2 is too small, which is not conducive to the circumferential flow of the cleaning liquid in the first tube body 1 during cleaning, resulting in a small circumferential flow rate of the cleaning liquid and a poor cleaning effect.

[0083] In order to allow the heat exchange medium or cleaning fluid to enter and exit from the end of the third fluid channel, both ends of the first tube body 1 extend out of the end of the second tube body 3. Figure 8 and Fig.10 , the distance that the end of the first tube body 1 extends out of the second tube body 3 is defined as L8. In some preferred embodiments of the present application, L8 is 50mm-300mm. This is because when the distance that the end of the first tube body 1 extends out of the second tube body 3 is less than 50mm, it is not conducive to the fixation of the two ends of the first tube body 1. When the distance that the end of the first tube body 1 extends out of the second tube body 3 is greater than 300mm, the length of the efficient heat exchange section inside the second tube body 3 will be relatively small, which is not conducive to increasing the heat exchange area of ​​the heat exchange tube.

[0084] In some embodiments of this application, please refer to Figure 8 , Fig. 9 , Fig.10 and Fig.11 In order to achieve a fixed connection between the first tube body 1 and the second tube body 3, the outer wall of the first tube body 1 and the inner wall of the second tube body 3 are connected by a plurality of support members 4, and there is a gap between two adjacent support members 4 to avoid blocking the third fluid channel. Fig.11 shown.

[0085] Specifically, the first tube body 1 and the second tube body 3 are concentrically arranged, and the support member 4 is arranged at least at both ends of the second tube body 3, so as to make the gap of the third fluid channel between the first tube body 1 and the second tube body 3 uniform, which is beneficial to uniform heat exchange of the heat exchange medium along the circumference of the first tube body 1, and is beneficial to uniform flow and flushing of the cleaning liquid along the circumference of the first tube body 1.

[0086] In the above embodiment, since the heat exchange tubes are usually installed inside the shell 6 of the heat exchange device, it is inconvenient to disassemble the heat exchange device to clean the heat exchange tubes, and the cleaning liquid cannot be easily passed into the third fluid channel.

[0087] In order to solve the above-mentioned problems, the second aspect of the present application provides a heat exchange tube cleaning module, including the heat exchange tube in the above-mentioned embodiment, and also including a cleaning liquid tank 5. The first tube body 1 is arranged to penetrate the cleaning liquid tank 5, and one end of the second tube body 3 is connected to the cleaning liquid tank 5. When it is necessary to clean the first tube body 1 and the heat exchange structure 2 in the heat exchange tube, high-pressure cleaning liquid can be input into the cleaning liquid tank 5 through a pump. The cleaning liquid enters the third fluid channel from one end of the second tube body 3 to soak and rinse the first tube body 1 and the heat exchange structure 2. The cleaning liquid tank 5 can be fixedly set on the heat exchange device. When the heat exchange tube needs to be cleaned, it is only necessary to pass the cleaning liquid into the cleaning liquid tank 5. There is no need to clean the heat exchange tube by disassembling the heat exchange device, such as Fig.15 and Fig.16 shown.

[0088] In some embodiments of this application, please refer to Fig.12 and Fig.13 The cleaning liquid box 5 includes two tube body mounting plates 530 arranged in sequence along the axial direction of the first tube body 1. The four sides of the tube body mounting plates 530 are connected by side plates 510, bottom plates 520 and top plates 540 respectively, enclosing a cavity for containing cleaning liquid. A plurality of mounting holes 531 are provided on the tube body mounting plates 530. The connection between the mounting holes 531 and the outer wall of the first tube body 1 or the outer wall of the second tube body 3 is a sealed connection to prevent leakage and pressure relief of the cleaning liquid at the mounting holes 531.

[0089] It should be noted that, since both ends of the first tube body 1 need to be connected to other heat transfer medium flow pipes in the heat exchange device, the first tube body 1 is arranged to penetrate the cleaning liquid box 5 and the first fluid channel is not connected to the inner cavity of the cleaning box. One end of the second tube body 3 extends into the cleaning liquid box 5, so that the cleaning liquid can enter the third fluid channel from one end of the second tube body 3. Fig.16 shown.

[0090] In the above embodiment, when the cleaning liquid moves along the axial direction of the second tube body 3, a certain pressure drop occurs, and the cleaning effect of the cleaning liquid on the first tube body 1 and the heat exchange structure 2 gradually deteriorates as the flow distance increases.

[0091] In order to solve the above problems, in some embodiments of the present application, please refer to Figure 7 , Figure 8 , Fig. 9 and Fig.16 Along the axial direction of the first tube body 1, at least two second tube bodies 3 are sleeved on the first tube body 1, and the two adjacent second tube bodies 3 are connected through the cleaning liquid tank 5, so that the first tube body 1 and the heat exchange structure 2 can be cleaned in sections, so that the cleaning liquid pressure of each section is maintained in an appropriate range.

[0092] As a specific embodiment of the present application, when two sections of enhanced heat exchange sections (i.e., length sections with heat exchange structure 2) are provided on the first tube body 1, two second tube bodies 3 are sleeved outside the two sections of enhanced heat exchange sections, and the cleaning liquid tank body 5 is provided in the middle of the first tube body 1. The cleaning liquid is introduced from the middle of the first tube body 1 and moves to both ends of the first tube body 1 under pressure, which is conducive to reducing the pressure drop of the cleaning liquid due to the long distance during the cleaning process, and is conducive to ensuring the cleaning effect. In addition, the cleaning liquid tank body 5 can also support the middle of the heat exchange tube, which is conducive to reducing the bending deformation of the heat exchange tube.

[0093] In some embodiments of this application, please refer to Fig. 9 , the end spacing of two adjacent second tube bodies 3 is defined as L7, and the axial length of the cleaning liquid tank body 5 along the first tube body 1 is defined as L9. In order to achieve conduction between the cleaning liquid tank body 5 and the second tube bodies 3 on both sides thereof, 1.05L7≤L9≤2L7. When the axial length of the cleaning liquid tank body 5 along the first tube body 1 is less than 1.05L7, the second tube body 3 and the tube body mounting plate 530 of the cleaning liquid tank body 5 will be poorly assembled, and the second tube body 3 cannot be extended into the cleaning liquid tank body 5; when the axial length of the cleaning liquid tank body 5 along the first tube body 1 is greater than 2L7, the length of the heat exchange tube inside the cleaning liquid tank body 5 will be too long, resulting in a waste of heat exchange area.

[0094] In some embodiments of this application, please refer to Fig.12 and Fig.13The inner wall of the cleaning liquid tank 5 has a guide surface 511 extending obliquely downward, and the bottom of the cleaning liquid tank 5 is provided with a cleaning liquid flow port 521, so that after cleaning is completed, if there is residual cleaning liquid inside the cleaning liquid tank 5, the cleaning liquid can flow out quickly under the guidance and gravity, so as to quickly empty the cleaning liquid tank 5.

[0095] It should be noted that the guide surface 511 may be an inclined surface or a curved surface extending obliquely downward. In order to reduce the difficulty of manufacturing the cleaning liquid tank 5, the guide surface 511 is preferably an inclined surface extending obliquely downward.

[0096] In some embodiments of the present application, the angle between the guide surface 511 inside the side plate 510 and the bottom plate 520 is defined as θ, and its value is slightly greater than 90°, preferably 90°<θ≤93°. This is because when θ is less than 90°, it cannot play an effective guiding role. When θ is greater than 93°, the top size of the cleaning liquid tank 5 will be larger, and it will be inconvenient to achieve welding assembly of the cleaning liquid tank 5.

[0097] A third aspect of the embodiments of the present application provides a heat exchange device, including the heat exchange tube in the above embodiment;

[0098] Alternatively, it includes the heat exchange tube cleaning module in the above embodiment.

[0099] See also Fig.15 and Fig.16 The heat exchange device includes a shell 6, and multiple heat exchange tubes are arranged inside the shell 6, and the axial direction of the heat exchange tubes is parallel to the axial direction of the shell 6; the inside of the shell 6 is used to hold a heat exchange medium, and a medium flow port 610 is provided on the shell 6; when the heat exchange medium is introduced into the shell 6, the multiple heat exchange tubes are immersed in the heat exchange medium, and when the high-temperature gaseous heat-conducting medium is introduced into the first fluid channel of the first tube body 1, the heat exchange medium enters the second fluid channel and performs enhanced heat exchange with the outer wall of the first tube body 1 and the heat exchange structure 2, the heat-conducting medium is condensed, and the heat exchange medium boils and evaporates inside the shell 6 after absorbing heat, thereby realizing heat transfer.

[0100] The first sealed chamber 7 and the second sealed chamber 8 are respectively provided at both ends of the shell 6, and the two ends of the first tube body 1 are respectively connected to the first sealed chamber 7 and the second sealed chamber 8; the first sealed chamber 7 is provided with a working medium inlet 710 for inputting a heat-conducting working medium into the first fluid channel of the first tube body 1; the second sealed chamber 8 is provided with a working medium outlet 810 for outputting the heat-conducting working medium after heat exchange in the first tube body 1 to the heat exchange device.

[0101] In some embodiments of this application, please refer to Fig.15 and Fig.16When the heat exchange device includes a heat exchange tube cleaning module, the working medium flow port 610 is arranged opposite to the cleaning liquid tank body 5, and the projection of the working medium flow port 610 on the cleaning liquid tank body 5 is located inside the cleaning liquid tank body 5. When the heat exchange working medium is input into the shell body 6 through the working medium flow port 610, the heat exchange working medium first contacts with the cleaning liquid tank body 5, which can avoid the heat exchange working medium from impacting the heat exchange tube when entering the shell body 6. At the same time, the plate body of the cleaning liquid tank body 5 can also have a certain liquid separation effect on the heat exchange working medium.

[0102] As a specific embodiment of the present application, the working fluid flow port 610 is arranged opposite to the bottom plate 520 of the cleaning liquid tank 5, and in the axial direction of the first tube body 1, the size of the working fluid flow port 610 is smaller than the length L9 of the cleaning liquid tank 5 along the axial direction of the first tube body 1. Specifically, when the diameter of the working fluid flow port 610 is defined as φ3, φ3<L9≤1.25φ3, when L9 is greater than 1.25φ3, it will cause the amount of water stored inside the cleaning liquid tank 5 to be too large, and the amount of cleaning liquid used will increase. After cleaning is completed, the amount of cleaning liquid reflux inside the cleaning liquid tank 5 is large, which is easy to cause waste of resources and time.

[0103] In some embodiments of this application, please refer to Fig.15 When the heat exchange device includes a heat exchange tube cleaning module, at least part of the cleaning liquid tank 5 is extended out of the shell 6 to be connected with the cleaning liquid pipeline 550. When cleaning the heat exchange tube, there is no need to disassemble the shell 6. It is only necessary to introduce pressurized cleaning liquid into the cleaning liquid tank 5 and the third fluid channel through the cleaning liquid pipeline 550, which is conducive to achieving efficient cleaning of heat exchange tubes with complex structures.

[0104] In some embodiments of this application, please refer to Fig.16 , Fig.17 and Fig.18 The bottom of the inner cavity of the second sealed chamber 8 has a groove 820, and the bottom surface of the groove 820 is connected to the working medium outlet 810, so that the condensed liquid heat-conducting working medium flowing out of the first tube body 1 can flow out of the second sealed chamber 8 smoothly, reducing the residual amount of the heat-conducting working medium in the second sealed chamber 8.

[0105] In some embodiments of the present application, the depth of the groove 820 is defined as H3, and the bottom wall thickness of the second sealed chamber 8 is defined as W2. In order to avoid the adverse effect of the groove 820 on the structural strength of the bottom of the second sealed chamber 8, the ratio of H3 to W2 is preferably 0.25-0.5. This is because, when the ratio is less than 0.25, the groove 820 is shallow, and the liquid heat-conducting medium cannot form a good liquid seal at the bottom of the second sealed chamber 8, and it is impossible to ensure that the liquid heat-conducting medium in the second sealed chamber 8 is completely exhausted; when the ratio is greater than 0.5, the chamber wall thickness at the groove 820 is greatly reduced, which will affect the local structural strength of the second sealed chamber 8 at the groove 820.

[0106] In some embodiments of this application, please refer to Fig.15 and Fig.16 Tube sheets 9 are provided at both ends of the shell 6 , and a plurality of through holes for connecting the first tube body 1 are provided on the tube sheet 9 , so as to realize the fixed setting of the first tube body 1 .

[0107] It should be noted that there is a preset spacing between the tube sheet 9 and the end of the second tube body 3 adjacent to it, which facilitates the cleaning liquid to flow out from the end of the second tube body 3 close to the tube sheet 9, and also facilitates the heat exchange medium to enter and exit the third fluid channel from the end of the second tube body 3 close to the tube sheet 9 during heat exchange.

[0108] In some embodiments of the present application, the heat exchange device further includes a flange 10, and the first sealing chamber 7 and the right tube sheet 9, and the second sealing chamber 8 and the left tube sheet 9 are connected via the flange 10. Fig.16 shown.

[0109] With the continuous development and application of energy-saving and environmental protection technologies, there is a demand for the development of energy-saving equipment using high-temperature heat pumps as a substitute for small boilers in the field of commercial air conditioning. At the same time, in industries with high energy consumption such as steel and chemical industry, with the call for energy conservation and emission reduction and rising energy prices, the utilization of a large amount of industrial waste heat generated during heat exchange has become an important research direction.

[0110] The fourth aspect of the embodiment of the present application provides a high-temperature heat pump system, including the heat exchange device in the above embodiment, the heat exchange device is provided with a steam outlet 620, when the heat exchange medium is liquid water, high-temperature steam can be generated by evaporation of the heat exchange medium, and the high-temperature steam can be output from the steam outlet 620, providing a steam heat source for the high-temperature heat pump system, realizing the utilization of a large amount of industrial waste heat generated during the heat exchange process. Specifically, the steam outlet 620 is arranged at the top of the shell 6, and the steam gathered at the top of the shell 6 during the heat exchange process can be output to the outside of the shell 6.

[0111] In some embodiments of the present application, the steam output from the steam outlet 620 can be used in steam turbine power generation, direct heating, industrial steam supply and other usage scenarios.

[0112] Compared with conventional heat exchange tubes used for hydrocarbon working fluids such as R134a and R410A, the heat exchange tubes of the present application can achieve efficient evaporation of water and are suitable for use in high-temperature heat pump systems, so that the heat exchange device of the present application can be used as a steam generator of the high-temperature heat pump system.

[0113] In some embodiments of the present application, the working process of the above heat exchange device is as follows:

[0114] Step 1: Liquid water (i.e., heat exchange medium) is introduced into the shell 6 through the medium flow port 610, so that the multiple heat exchange tubes are completely immersed in the heat exchange medium;

[0115] Step 2: introducing a high-temperature gaseous heat-conducting medium through the medium inlet 710 of the first sealing chamber 7, and the heat-conducting medium enters the first fluid channel of the first tube body 1;

[0116] Step 3: The heat exchange medium enters the second fluid channel and the third fluid channel, and performs contact heat exchange with the first tube body 1 and the heat exchange structure 2; the bubbles generated during the heat exchange process overflow from the outer wall of the first tube body 1, the second flow groove 220 and the third fluid channel in turn, and gather at the top of the shell 6;

[0117] Step 4: The heat conducting medium inside the first tube 1 Fig.16 The steam moves from right to left in the shell 6, condenses into liquid heat-conducting medium after sufficient heat exchange, flows into the second sealed chamber 8, and is discharged from the groove 820 and the medium outlet 810 of the second sealed chamber 8. The steam outlet 620 at the top of the shell 6 can be opened and closed as needed to provide steam for the high-temperature heat pump system.

[0118] In some embodiments of the present application, when the heat exchange device includes a heat exchange tube cleaning module, the cleaning process of the heat exchange device is as follows:

[0119] Step 1: exhaust the heat exchange medium inside the shell 6 through the medium flow port 610;

[0120] Step 2: Input pressurized cleaning liquid into the cleaning liquid box 5 through the cleaning liquid pipeline 550; the cleaning liquid flows from the middle of the first tube body 1 to the third fluid channels on both sides to flush the outer wall of the first tube body 1 and the heat exchange structure 2;

[0121] Step 3: After cleaning is completed, a part of the cleaning liquid is discharged from one end of the second tube body 3 close to the tube plate 9, enters the interior of the shell 6, and is discharged from the working medium flow port 610; the other part of the cleaning liquid remains in the cleaning liquid tank 5 and is discharged through the cleaning liquid flow port 521 and the cleaning liquid pipeline 550.

[0122] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0123] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0124] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A heat exchange tube, characterized in that: include: A first tube body (1), wherein the first tube body (1) has a first fluid channel inside; A heat exchange structure (2), wherein a plurality of the heat exchange structures (2) are arranged in sequence along the circumference of the first tube body (1), each of the heat exchange structures (2) and the outer wall of the first tube body (1) enclose a second fluid channel, and the heat exchange structure (2) has a plurality of hollow portions, and the hollow portions are connected to the corresponding second fluid channels.

2. The heat exchange tube according to claim 1, characterized in that: The cross-sectional shape of the heat exchange structure (2) is a V-shaped, C-shaped or U-shaped structure.

3. The heat exchange tube according to claim 1, characterized in that: The hollow portion comprises a first circulation groove (210) and a second circulation groove (220), wherein a plurality of the first circulation grooves (210) are arranged on one side or both sides of the length direction of the heat exchange structure (2); and a plurality of the second circulation grooves (220) are arranged along the length direction of the heat exchange structure (2) and are arranged opposite to the outer wall of the first tube body (1).

4. The heat exchange tube according to any one of claims 1 to 3, characterized in that: The heat exchange tube further comprises a second tube body (3), wherein the second tube body (3) is sleeved on the outside of the first tube body (1) and the heat exchange structure (2), a third fluid channel is formed between the outer wall of the first tube body (1) and the inner wall of the second tube body (3), and the second fluid channel is connected to the third fluid channel.

5. The heat exchange tube according to claim 4, characterized in that: The outer wall of the first tube body (1) and the inner wall of the second tube body (3) are connected via a plurality of support members (4).

6. A heat exchange tube cleaning module, characterized in that: It comprises the heat exchange tube as claimed in claim 4 or 5, and also comprises a cleaning liquid tank (5), wherein the first tube (1) is arranged to penetrate the cleaning liquid tank (5), and one end of the second tube (3) is connected to the cleaning liquid tank (5).

7. A heat exchange tube cleaning module according to claim 6, characterized in that: At least two second tube bodies (3) are sleeved on the first tube body (1) along the axial direction of the first tube body (1), and two adjacent second tube bodies (3) are connected via the cleaning liquid tank body (5).

8. The heat exchange tube cleaning module according to claim 6 or 7, characterized in that: The inner wall of the cleaning liquid box (5) has a guide surface (511) extending obliquely downward, and the bottom of the cleaning liquid box (5) is provided with a cleaning liquid flow opening (521).

9. A heat exchange device, characterized in that: The heat exchange tube comprises the heat exchange tube as claimed in any one of claims 1 to 5.

10. The heat exchange device according to claim 9, characterized in that: The heat exchange device comprises a shell (6), a plurality of heat exchange tubes are arranged inside the shell (6), and the axial direction of the heat exchange tubes is parallel to the axial direction of the shell (6); the inside of the shell (6) is used to accommodate heat exchange medium, and the shell (6) is provided with a medium flow port (610); The two ends of the shell (6) are respectively provided with a first sealed chamber (7) and a second sealed chamber (8); the two ends of the first tube body (1) are respectively connected to the first sealed chamber (7) and the second sealed chamber (8); the first sealed chamber (7) is provided with a working fluid inlet (710); and the second sealed chamber (8) is provided with a working fluid outlet (810).

11. The heat exchange device according to claim 10, characterized in that: The inner cavity bottom of the second sealing chamber (8) is provided with a groove (820), and the bottom surface of the groove (820) is in communication with the working medium outlet (810).

12. The heat exchange device according to claim 10, characterized in that: Tube plates (9) are provided at both ends of the shell (6), and the tube plates (9) are provided with a plurality of through holes for connecting the first tube body (1).

13. A heat exchange device, characterized in that: It comprises a heat exchange tube cleaning module as described in any one of claims 6 to 8.

14. The heat exchange device according to claim 13, characterized in that: The heat exchange device comprises a shell (6), a plurality of heat exchange tubes are arranged inside the shell (6), and the axial direction of the heat exchange tubes is parallel to the axial direction of the shell (6); the inside of the shell (6) is used to accommodate heat exchange medium, and the shell (6) is provided with a medium flow port (610); The two ends of the shell (6) are respectively provided with a first sealed chamber (7) and a second sealed chamber (8); the two ends of the first tube body (1) are respectively connected to the first sealed chamber (7) and the second sealed chamber (8); the first sealed chamber (7) is provided with a working fluid inlet (710); and the second sealed chamber (8) is provided with a working fluid outlet (810).

15. The heat exchange device according to claim 14, characterized in that: The working medium flow opening (610) is arranged opposite to the cleaning liquid tank (5), and a projection of the working medium flow opening (610) on the cleaning liquid tank (5) is located inside the cleaning liquid tank (5).

16. The heat exchange device according to claim 14, characterized in that: At least a portion of the cleaning liquid tank (5) extends out of the housing (6) and is configured to communicate with the cleaning liquid pipeline (550).

17. The heat exchange device according to any one of claims 14 to 16, characterized in that: The inner cavity bottom of the second sealing chamber (8) is provided with a groove (820), and the bottom surface of the groove (820) is in communication with the working medium outlet (810).

18. The heat exchange device according to any one of claims 14 to 16, characterized in that: Tube plates (9) are provided at both ends of the shell (6), and the tube plates (9) are provided with a plurality of through holes for connecting the first tube body (1).

19. A high temperature heat pump system, comprising the heat exchange device according to any one of claims 9 to 18, characterized in that: The heat exchange device is provided with a steam outlet (620).

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