Heat exchange tube, heat exchanger tube core, heat exchanger and manufacturing method

[0060] The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain related inventions, rather than to limit the invention. It should also be noted that, for ease of description, only parts related to the invention are shown in the drawings.

[0061] In the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "center", "longitudinal", "axial" etc. are based on the orientation or positional relationship shown in the drawings Positional relationship. These terms are mainly used to better describe the present invention and its embodiments, and are not intended to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.

[0062] figure 1 It is a perspective view of the heat exchanger according to the first embodiment of the present invention. In the figure, the heat exchanger is generally indicated by reference numeral 100 . The heat exchanger 100 includes a shell 101 and a heat exchanger tube core 102 .

[0063] The housing 101 includes a housing body 110 , and a first fluid medium inlet 111 , a first fluid medium outlet 112 , and a second fluid medium inlet 127 and a second fluid medium outlet 126 disposed on the housing body 110 . In order to clearly show the inside of the heat exchanger 100, the casing main body 101 is shown transparently.

[0064] The heat exchanger tube core 102 is arranged inside the shell main body 110 of the shell 101, including an upper tube plate 122, a lower tube plate 123, a winding core 124 fixedly connected to the center of the lower tube plate 123, and a winding core 124 The center is the heat exchange tube 121 wound around the winding core 124 . The heat exchange tube 121 as a whole includes two ends, namely figure 1 The overall upper end and lower end of each heat exchange tube 121 shown in .

[0065] figure 2 Yes figure 1 The front sectional view of the heat exchanger 100 shown in , in which a partially enlarged sectional view of the heat exchange tube 121 is shown in a circle. It can be seen from the partially enlarged cross-sectional view of the heat exchange tube 121 that the heat exchange tube 121 includes a first hollow tube 1211 and a second hollow tube 1212 , and the first hollow tube 1211 is built in the second hollow tube 1212 . The upper end of the first hollow tube 1211 passes through the through hole in the upper tube plate 122 and is sealingly connected with it, and the upper end of the second hollow tube 1212 of the heat exchange tube 121 passes through the through hole in the lower tube plate 123 and is sealingly connected with it . It can be seen that the shape of the through hole on the upper tube plate 122 is the same as the cross-sectional shape of the first hollow tube 1211 , and the shape of the through hole on the lower tube plate 123 is the same as the cross-sectional shape of the second hollow tube 1212 . In order to facilitate the passage of the first hollow tube 1211 through the lower tube plate 123 and the upper tube plate 122 respectively, the part of the first hollow tube 1211 between the upper tube plate 122 and the lower tube plate 123 is a straight tube section.

[0066] Also refer to figure 1 and figure 2 , as shown in the figure, the upper end of the first hollow tube 1211 protrudes beyond the upper end of the second hollow tube 1212, and a gap is formed between the outer wall of the first hollow tube 1211 and the inner wall of the second hollow tube 1212 , the middle part of the heat exchange tube 121 is wound around the winding core 124 in a spiral shape. The heat exchange tube 121 sequentially includes a straight tube section and a transition tube section between the lower tube plate 122 and the helically wound part of the heat exchange tube 121 to avoid excessive deformation of the heat exchange tube 121 when the heat exchange tube 121 is wound in a helical shape .

[0067] The heat exchanger tube core 102 is sealed and connected to the shell body 110 of the shell 101 through the upper tube plate 122 and the lower tube plate 123, so that the first fluid medium inlet 111 is in fluid-tight communication with the upper end of the first hollow tube 1211, and the second A fluid medium outlet 112 is in fluid-tight communication with the upper end of the second hollow tube, the first fluid medium inlet 111, the upper end of the first hollow tube 1211, the inner cavity of the first hollow tube 1211, the The lower end, the gap between the first hollow tube 1211 and the second hollow tube 1212, the upper end of the second hollow tube 1212 and the first fluid medium outlet 112 form a first fluid medium channel, the second fluid medium inlet 127 and the second fluid medium inlet 127 The second fluid medium outlet 126 and the shell body 110 form a second fluid medium channel that is sealed and isolated from the first fluid medium channel, and the part of the heat exchange tube 121 below the lower tube plate 123 protrudes into the second fluid medium channel.

[0068] It can be seen that in this embodiment, the total length of the heat exchange tubes that the first fluid medium flows through in the heat exchange tubes 121 is the sum of the length of the first hollow tube 1211 and the length of the second hollow tube 1212, which is different from the existing Compared with the coiled tube heat exchanger using non-casing heat exchange tubes, the actual total heat exchange tube length of the heat exchange tubes 121 of the heat exchanger 100 of the present invention is The increase is about double, so the heat exchange area is increased and the heat exchange efficiency is improved.

[0069] At the same time, since the temperature of the outer wall of the heat exchange tube 121 is the temperature of the outer wall of the second hollow tube 1212, which depends on the temperature of the first fluid medium between the outer wall of the first hollow tube 1211 and the inner wall of the second hollow tube 1212, The heat exchange tube 121 usually passes through the first fluid medium with a lower temperature, and the second fluid medium with a higher temperature is usually outside the heat exchange tube 121. After heat exchange, the outer wall of the first hollow tube 1211 and the second fluid medium The temperature of the first fluid medium between the inner walls of the hollow tubes 1212 is generally higher than the temperature of the first fluid medium in the first hollow tube 1211, so compared with the non-casing heat exchange tubes of the prior art, the present invention The temperature of the outer wall of the heat exchange tube 121 is higher than the temperature of the outer wall of the non-casing heat exchange tube in the prior art, which reduces the possibility of dew point corrosion.

[0070] Taking the second fluid medium as acidic high-temperature flue gas and the first fluid medium as air at normal temperature, in the conventional coiled tube heat exchanger using non-tube heat exchange tubes, the first fluid medium usually flows from the casing It enters from the top and discharges from the bottom of the shell, and only conducts a countercurrent heat exchange with the second fluid medium. The temperature of the outer wall of the tube near the inlet of the heat exchange tube is relatively low, and the temperature of the second fluid medium outside the tube near the inlet of the heat exchange tube is also low. , if the temperature of the second fluid medium at the outer wall of the tube near the inlet of the heat exchange tube drops below the dew point temperature, the heat exchange tube may suffer from dew point corrosion there. According to the heat exchanger 100 of the present invention, it can be known from the flow process of the first fluid medium in the first fluid medium channel that the flow direction of the first fluid medium in the inner cavity of the first hollow tube 1211 is from top to bottom, When the first fluid medium flows out from the lower end of the first hollow tube 1211 into the gap between the outer wall of the first hollow tube 1211 and the inner wall of the second hollow tube 1212, the flow direction of the first fluid medium changes from bottom to top, while The flow direction of the second fluid medium outside the heat exchange tube 121 is from the second fluid medium inlet 127 to the second fluid medium outlet 126, that is, from top to bottom. Therefore, the first fluid medium in the inner cavity of the first hollow tube 1211 A countercurrent heat exchange is performed between the fluid medium and the first fluid medium in the gap between the outer wall of the first hollow tube 1211 and the inner wall of the second hollow tube 1212 through the tube wall of the first hollow tube 1211, and the first hollow tube The first fluid medium in the gap between the outer wall of the tube 1211 and the inner wall of the second hollow tube 1212 and the second fluid medium outside the second hollow tube 1212 pass through the outer tube wall of the heat exchange tube 121, that is, the second hollow tube. The tube wall of the tube 1212 performs secondary countercurrent heat exchange, so compared with the traditional coiled tube heat exchanger, the heat exchange efficiency is greatly improved.

[0071]Moreover, in the traditional coiled tube heat exchanger, the second fluid medium at the outlet of the second fluid medium is flue gas with a lower temperature after heat exchange, and the first fluid medium here is in a state where the heat exchange has not been performed sufficiently. The air with a lower temperature, so the temperature of the outer wall of the heat exchange tube here is also lower. After heat exchange in the heat exchanger 100 according to the present invention, at the second fluid medium outlet 126, the second fluid medium outside the second hollow tube 1212 is the low-temperature flue gas after heat exchange, and the second hollow tube The first fluid medium in 1212 is high-temperature air after at least one countercurrent heat exchange, so the temperature of the outer wall of the heat exchange tube 121 located at the outlet 126 of the second fluid medium is relatively high. device, reducing the possibility of dew point corrosion occurring on the outer wall of the heat exchange tube 121 here.

[0072] In this embodiment, the heat exchanger tube core 102 also includes a holding plate 125, which is fixed to the shell body 110, and the holding plate 125 can prevent the heat exchange tube 121 or the winding core 124 from being damaged due to the flushing of the fluid medium. Vibration affects heat transfer. The holding plate 125 is provided with a through hole (not shown) corresponding to the lower end of the heat exchange tube 121 and the lower end of the winding core 124. The through hole is a clearance fit, so that when the heat exchange tube 121 and the winding core 124 are heated and expanded in the working state of the heat exchanger 100, the lower ends of the heat exchange tube 121 and the winding core 124 can freely elongate along the central axis of the shell. , to avoid expansion stress and deformation between the heat exchange tube 121 , the winding core 124 , the lower tube plate 123 and the retaining plate 124 . Moreover, only the upper end of the first hollow tube 1211 is sealingly connected with the upper tube plate 122, and only the upper end of the second hollow tube 1212 is sealingly connected with the lower tube plate 123, and the lower ends of the first hollow tube 1211 and the second hollow tube 1212 are both The free end, the sealing connection is usually welded, so this structure can protect the welds between the upper end of the first hollow tube 1211 and the upper tube plate 122 and the upper end of the second hollow tube 1212 and the lower tube plate 123 from being torn , good sealing.

[0073] In this embodiment, the fixed connection between the holding plate 125 and the housing main body 110 can be a non-detachable connection such as a welding connection, or a detachable connection such as a bolt and nut connection (not shown in the figure). When the detachable connection is adopted, the maintenance of the heat exchange tubes is facilitated, for example, the removal of dust deposited on the heat exchange tubes is facilitated. image 3 Yes figure 1 Left side view of heat exchanger 100 shown in, Figure 4 is along figure 2 The top sectional view of the heat exchanger taken at the section A-A in the middle. Also refer to Figure 1-4 , as shown in the figure, the first fluid medium inlet 111 is arranged on the shell body 110 above the upper tube plate 122, and the first fluid medium outlet 112 is set on the shell body 110 between the upper tube plate 122 and the lower tube plate 123 on, from image 3 It can be seen in the figure that the first fluid medium outlet 112 corresponds to the part of the first hollow tube 1211 protruding beyond the upper end of the second hollow tube 1212, and the second fluid medium outlet 126 corresponds to the free end of the heat exchange tube 121. On the shell main body 110 , the second fluid medium inlet 127 is arranged immediately below the lower tube plate 123 . refer to figure 2 and Figure 4 , as clearly shown in the figure, in this embodiment, two first fluid medium outlets 112 are provided for allowing the first fluid medium to flow out from the shell body 110 of the heat exchanger 100 quickly and uniformly.

[0074] Continue to refer to figure 2 and Figure 4 , for the sake of clarity, only three heat exchange tubes 121 arranged in each of the three heat exchange tube layers are schematically shown in this embodiment. In actual use, the number of heat exchange tubes 121 and heat exchange tube layers Not limited by this embodiment, each heat exchange tube layer includes at least one heat exchange tube, and the heat exchange tubes in the same heat exchange tube layer are wound with the same helix radius and helix angle. It is also shown in the figure that the winding directions of the heat exchange tubes 121 in adjacent heat exchange tube layers are opposite. The opposite winding direction of the heat exchange tubes will increase the turbulent flow between the heat exchange tube layers and improve the heat exchange efficiency. By setting different helix angles for the heat exchange tubes 121 of each heat exchange tube layer, the lengths of the heat exchange tubes 121 in all heat exchange tube layers can be basically the same, thereby ensuring the flow of the first fluid medium in the heat exchange tubes 121 The stroke length is the same and the pressure drop is the same.

[0075] In this embodiment, the retaining plate 125 may not be fixed to the shell body 110, but fits with the shell body 110 in a gap, and is fixedly connected with the lower end of the winding core 124 and the free end of the heat exchange tube 121, and the heat exchange tube 121 When heat expands in the axial direction, the retaining plate 125 freely expands in the axial direction and moves along with the lower ends of the heat exchange tubes 121 and the winding core 124 being heated and expanded. In this embodiment, there are two first fluid medium outlets 112 , but the present invention is not limited thereto, and there may be a plurality of first fluid medium outlets evenly spaced. In this embodiment, the second fluid medium inlet 127 is arranged immediately below the lower tube plate 123, and the second fluid medium outlet 126 is arranged under the casing to form a secondary countercurrent heat exchange with the heat exchange tube 121, but the present invention is not limited thereto It is also feasible to exchange the positions of the second fluid medium inlet 127 and the second fluid medium outlet 126, and it is within the protection scope of the present invention. In this embodiment, the upper end of the first hollow tube 1211 is terminated in the upper tube plate 122, and the upper end of the second hollow tube 1212 is terminated in the lower tube plate 123, but the present invention is not limited thereto, the first hollow tube 1211 The upper end may extend above the upper tube sheet 122 , and the upper end of the second hollow tube 1212 may extend and open between the upper tube sheet 122 and the lower tube sheet 123 .

[0076] In the sleeve-type spiral wound heat exchanger 100 according to this embodiment of the present invention, since the upper end of the first hollow tube 1211 and the upper end of the second hollow tube 1212 need to be sealed and connected to the upper tube sheet 122 and the lower tube sheet 123 respectively , so in the actual manufacturing process, the process of the innermost heat exchange tube 121 is first carried out, and the upper end of the second hollow tube 1212 of the innermost heat exchange tube 121 is passed through the corresponding through hole on the lower tube plate 123 and It is welded and sealed, and then the lower end of the first hollow tube 1211 of the heat exchange tube 121 is inserted into the second hollow tube 1212 to a suitable position to form the required sleeve; The middle part between the upper end of the second hollow tube 1212 and the lower end of the first hollow tube 1211 is wound around the winding core 124 in a spiral shape; The part between the open end of the second hollow tube and the second end of the first hollow tube is wound around the winding core in a spiral shape; then repeat the above steps until the heat exchange in the last heat exchange tube layer The arrangement of the tubes 121 is completed; finally, the upper ends of the first hollow tubes 1211 of all the heat exchange tubes 121 are passed through the corresponding through holes of the upper tube plate 122 and welded and sealed.

[0077] Considering the ease of processing the sleeve-type helically wound heat exchange tubes used in the heat exchanger according to the present invention, it is possible to use circular cross-sections in the heat exchange tube layers close to the winding core. The sleeve-type heat exchange tube can also use ordinary spirally wound heat exchange tubes to reduce processing resistance.

[0078] Figure 5 is a front sectional view of a heat exchanger according to a second embodiment of the present invention. The heat exchanger is indicated generally at 200 .

[0079] The difference between the second embodiment and the first embodiment is that the second embodiment does not include a holding plate, and the lower ends of the heat exchange tubes 221 and the winding tube cores 224 are kept as free ends. In the case of this embodiment, the lower end of the shell body 210 can be set to be detachable, so as to facilitate the maintenance of the heat exchange tubes, such as removing dust accumulation.

[0080] Figure 5 Although it is shown that the heat exchange tube 221 includes a transition tube section and a straight tube section between the middle helical part and the free end, since the retaining plate is not included, the straight tube section may not be included.

[0081] Refer below Figure 6-19 An example of the double-tube heat exchange tube forming the heat exchange tube used in the heat exchanger of the present invention will be described. For clarity, Figure 6-19 The sleeve-type heat exchange tube shown in is a straight heat exchange tube, and the heat exchange tube used in the heat exchanger of the present invention is formed by winding it around a winding core.

[0082] Image 6 is a perspective view of a jacketed heat exchange tube used to form the first embodiment of the heat exchange tube of the heat exchanger according to the present invention. Figure 7 Yes Image 6 A cross-sectional view of the heat exchange tube shown in . The heat exchange tube is generally indicated by 321. The heat exchange tube 321 includes a first hollow tube 3211 and a second hollow tube 3212. The first hollow tube 3211 includes an open first end and a second end. The second hollow tube 3212 Including an open end and a closed end, the first hollow tube 3211 is built in the second hollow tube 3212, and a gap is formed between the outer wall of the first hollow tube 3211 and the inner wall of the second hollow tube 3212 , and the first end of the first hollow tube 3211 protrudes out of the open end of the second hollow tube 3212, the second end of the first hollow tube 3211 and the closed end of the second hollow tube 3212 The inner wall of the part is spaced apart.

[0083] Figure 8 Yes Image 6 The top view of the heat exchange tube 321 shown in . Figure 8 As shown in , the first hollow tube 3211 has a circular cross-section, the second hollow tube 3212 has an elliptical cross-section, and the outer diameter of the first hollow tube 3211 is the same as that of the second hollow tube 3212. The inner diameter of the short axis is equal, that is, the outer end of the cross section of the first hollow tube 3211 along the short axis direction overlaps with the inner end of the cross section of the second hollow tube 3212 along the short axis direction, thereby passing the shape fit, the first hollow tube 3211 is held in the second hollow tube 3212, and a stable gap is formed between the outer wall of the first hollow tube 3211 and the inner wall of the second hollow tube 3212, but the fit also allows The first hollow tube 3211 and the second hollow tube 3212 slide axially relative to each other, and during actual use, when heated and expanded, they will not restrict each other to generate expansion stress.

[0084] Figure 9-11 is a plan view of the sleeve-type heat exchange tubes used to form the second to fourth embodiments of the heat exchange tubes of the heat exchanger according to the present invention. Figure 9-11 The example shown is Figure 6-8 A variant of the embodiment shown in . The heat exchange tubes 421, 421', 421" shown in the figure respectively include first hollow tubes 4211, 4211', 4211", second hollow tubes 4212, 4212', 4212", first hollow tubes 4211, 4211', 4211" and the second hollow tube 4212, 4212', 4212" are biaxially symmetrical in cross-section, that is, there are two symmetry axes, and the outer transverse shape of the first hollow tube 4211, 4211', 4211" The end of the section along the major axis coincides with a part of the end of the inner cross-section of the second hollow 4212, 4212', 4212" along the major axis, so that the first hollow tube 4211, 4211 ', 4211" is held in the second hollow tube 4212, 4212', 4212", and between the outer wall of the first hollow tube 4211, 4211', 4211" and the second hollow tube 4212, 4212', 4212" A stable gap is formed between the inner walls. The form fit of the cross-section is not restricted to the ends of only one of the double axes of symmetry of the cross-section, as in Figure 11 As shown in the heat exchange tube 421", the cross-section of the first hollow tube 4211" is a dumbbell-shaped bulge in the middle, the cross-section of the second hollow tube 4212' is rectangular, and the outer surface of the first hollow tube 4211' is Not only the end along the long axis of the cross section coincides with a part of the end along the long axis of the inner cross section of the second hollow 4212 ′, but also partially overlaps along the long side. same, Figure 9-11 The form fit shown in also allows the first hollow tube 4211, 4211', 4211" and the second hollow tube 4212, 4212', 4212" to slide axially relative to each other, in actual use, subject to During thermal expansion, they will not restrict each other to generate expansion stress and deformation.

[0085] Heat exchange tube 421, 421 ' and 421 " other structures are all with Figure 6-8 The same as the heat exchange tube 321 shown in , and will not be described in detail here.

[0086] Figure 12 is a perspective view of a jacketed heat exchange tube for forming a fifth embodiment of the heat exchange tube of a heat exchanger according to the present invention. Figure 13 Yes Figure 12 Cross-sectional view of the heat exchange tube. The heat exchange tube is generally marked with 521. The heat exchange tube 521 includes a first hollow tube 5211 and a second hollow tube 5212. The first hollow tube 5211 includes an open first end and a second end. The second hollow tube 5212 Including an open end and a closed end, the first hollow tube 5211 is built in the second hollow tube 5212, and a gap is formed between the outer wall of the first hollow tube 5211 and the inner wall of the second hollow tube 5212 , and the first end of the first hollow tube 5211 protrudes outside the open end of the second hollow tube 5212, the second end of the first hollow tube 5211 is connected to the closed end of the second hollow tube 5212 The inner wall of the part is spaced apart.

[0087] Figure 14 Yes Figure 12 The top view of the heat exchange tube 521 shown in . Figure 14 As shown in , the first hollow tube 5211 and the second hollow tube 5212 have a circular cross section, the outer diameter of the first hollow tube 5211 is smaller than the inner diameter of the second hollow tube 5212, and the first hollow tube 5211 The outer wall of the first hollow tube 5211 and the inner wall of the second hollow tube 5212 form a stable gap through the fins 5213 forming a helical fin 5213 as a support. Moreover, the helical fin 5213 abuts against the inner wall of the second hollow tube 5212 in a floating manner, allowing the first hollow tube 5211 and the second hollow tube 5212 to slide relative to each other, and expand when heated during actual use. , will not restrict each other to generate expansion stress. In this embodiment, the first fluid medium flows in the gap between the outer wall of the first hollow tube 5211 and the inner wall of the second hollow tube 5212 along the helical direction of the fins, and the helical fins 5213 can enhance the disturbance, Further improve the heat exchange effect.

[0088] Figure 15 is a perspective view of a sleeve-type heat exchange tube used to form a sixth embodiment of the heat exchange tube of a heat exchanger according to the present invention. Figure 16 Yes Figure 15 Cross-sectional view of the heat exchange tube. The heat exchange tube is generally marked with 621. The heat exchange tube 621 includes a first hollow tube 6211 and a second hollow tube 6212. The first hollow tube 6211 includes an open first end and a second end. The second hollow tube 6212 Including an open end and a closed end, the first hollow tube 6211 is built in the second hollow tube 6212, and a gap is formed between the outer wall of the first hollow tube 6211 and the inner wall of the second hollow tube 6212 , and the first end of the first hollow tube 6211 protrudes outside the open end of the second hollow tube 6212, the second end of the first hollow tube 6211 and the closed end of the second hollow tube 6212 The inner wall of the part is spaced apart.

[0089] Figure 17 Yes Figure 15 The top view of the heat exchange tube 621 shown in . Figure 17 As shown in , the first hollow tube 6211 has a rectangular cross-section, the second hollow tube 6212 has an elliptical cross-section, and the major axis and minor axis dimensions of the first hollow tube 6211 are smaller than the length of the second hollow tube 6212. Axis and minor axis dimensions, ribs 6213 as supports are formed on the outer wall of the first hollow tube 6211, the ribs 6213 are discontinuous in the axial direction of the heat exchange tube, that is, in the form of discrete segments, so The ribs 6213 can form a stable gap between the outer wall of the first hollow tube 6211 and the inner wall of the second hollow tube 6212 , and at the same time, when the heat exchange tube 621 is helically wound, it will not form a large resistance to the helical winding. Moreover, the rib 6213 abuts against the inner wall of the second hollow tube 6212 in a floating manner, allowing the first hollow tube 6211 and the second hollow tube 6212 to slide axially relative to each other, and expand when heated during actual use. , will not restrict each other to generate expansion stress.

[0090] In theory, Figure 12-14 The helical fins in 5213 and Figure 15-17 The ribs 6213 in the middle can also be formed on the second hollow tube 5212 or the inner wall of the second hollow tube 6212 .

[0091] Figure 18-20 is a plan view of sleeve-type heat exchange tubes used to form seventh to ninth embodiments of the heat exchange tubes of the heat exchanger according to the present invention. Figure 18-20 The example shown is Figure 12-17 A variant of the embodiment shown in . The heat exchange tubes 721, 721', 721" shown in the figure include first hollow tubes 7211, 7211', 7211" and second hollow tubes 7212, 7212', 7212", the first hollow tubes 7211, 7211 ', 7211 "and the cross section of the second hollow tube 7212, 7212', 7212" all have a major axis and a minor axis, the two axes of symmetry are overlapped, and the first hollow tube 7211, 7211', 7211 "the The major and minor axis dimensions of the section are smaller than the major and minor axis dimensions of the cross section of the second hollow tube 7212, 7212', 7212". In the first hollow tube 7211, 7211', 7211" and the second The supports 7213, 7213', 7213" between the hollow tubes 7212, 7212', 7212" are bolt and nut assemblies, and the bolts pass through the first hollow tubes 7211, 7211', 7211" from the first hollow tubes 7211, 7211 ', 7211" protrudes and is retained on the first hollow tube 7211, 7211', 7211" by nuts. Moreover, the bolt head of the bolt-nut assembly 7213, 7213', 7213" floats against the second hollow tube 7212 , the inner wall of 7212', 7212", allowing the first hollow tube 7211, 7211', 7211" and the second hollow tube 7212, 7212', 7212" to slide relative to each other, during actual use, thermal expansion , will not restrict each other to generate expansion stress.

[0092] It can be seen that the support member suitable for the heat exchange tubes of the heat exchanger according to the present invention should not only play a role in maintaining the gap and fluid medium flow space, but also be able to be spirally distributed as the heat exchange tubes are wound, without reverse exchange. The winding of the heat pipe creates excessive resistance.

[0093] back reference Figure 1-5 , because in the heat exchanger 100 or 200, the upper ends of the first hollow tubes 1211, 2211 of the heat exchange tubes 121 or 221 are hermetically connected to the upper tube plate 122 or 222, and the upper ends of the second hollow tubes 1212, 2212 are hermetically connected To the lower tube plate 123 or 223, the upper tube plate 122 or 222 and the lower tube plate 123 or 223 are respectively fixedly connected to the inner wall of the shell body 110 or 210, so in theory the first hollow tube 1211, 2211 and the second hollow tube The relative positions of 1212 and 2212 remain fixed, Figure 12-20 The supports in the embodiment of the heat exchange tube shown in can also be omitted.

[0094] Figure 21 is a perspective view of a separate heat exchanger tube 102 for a heat exchanger 100 according to a first embodiment of the invention. Figure 22 Yes Figure 21 The cross-sectional schematic diagram of the heat exchange tube of the heat exchanger tube core 102 in FIG. For the sake of clarity, only one heat exchange tube is shown in the figure as an example. Also refer to Figure 21 and Figure 22 , it can be clearly seen in the figure that the heat exchanger tube core 102 includes an upper tube sheet 122, a lower tube sheet 123, a winding core 124 connected to the center of the lower tube sheet 123, and a spirally wound heat exchange tube 121, The heat exchanger tube core 102 also includes a holding plate 125 through which the lower ends of the heat exchange tubes 121 and the winding core 124 pass. The holding plate 125 is used to prevent the heat exchange tubes 121 and the winding core 124 from being subjected to fluid in actual use. The medium is washed and shaken.

[0095] It can also be seen in the figure that the heat exchange tube 121 includes a first hollow tube 1211 and a second hollow tube 1212, the upper end of the first hollow tube 1211 protrudes outside the second hollow tube 1212, and is sealed and connected to On the upper tube plate 122, the upper end of the second hollow tube 1212 is sealingly connected to the lower tube plate 123, and the lower end of the first hollow tube 1211 is spaced apart from the inner wall of the lower end of the second hollow tube 1212 to prevent the first hollow tube The lower end of the tube 1211 collides with the inner wall of the lower end of the second hollow tube 1212 after being heated and expanded in the axial direction during actual work.

[0096] Also refer to figure 2 and Figure 21 ,In use Figure 6-20 When the heat exchange tube having a major axis and a minor axis in the cross section of at least the second hollow tube shown in is wound into a heat exchange tube having a helical part according to the present invention, the major axis of the cross section of the heat exchange tube is usually set It is parallel to the flow direction of the second fluid medium, that is, parallel to the axial direction of the heat exchanger, so as to reduce the flow resistance of the second fluid medium and the stagnation area behind the tube, thereby improving the heat exchange efficiency.

[0097] Figure 23 is a front cross-sectional view of a heat exchanger tube for a heat exchanger according to a second embodiment of the present invention. The heat exchanger tube core 202 used in the second embodiment differs from the heat exchanger tube core 102 used in the first embodiment only in that the heat exchanger tube core 202 in the second embodiment does not include a holding plate, and the heat exchange The lower end of the tube 221 and the lower end of the winding core 224 remain as free ends. Figure 22 Although it is shown that the heat exchange tube 221 includes a transition tube section and a straight tube section between the middle helical part and the free end, since the retaining plate is not included, the straight tube section may not be included.

[0098] The above description is only a preferred embodiment of the present application and an illustration of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solution formed by the specific combination of the above-mentioned technical features, but should also cover the technical solution formed by the above-mentioned technical features without departing from the inventive concept. Other technical solutions formed by any combination of or equivalent features thereof. For example, a technical solution formed by replacing the above-mentioned features with technical features with similar functions disclosed in (but not limited to) this application.