Heat exchanger tubes, heat exchanger core and heat exchanger

Abstract

This application discloses a heat exchanger tube made of cast iron, comprising a hollow tube body extending longitudinally and a heat exchanger tube inlet and outlet at both ends of the hollow tube body. The hollow tube body has a non-circular cross-section perpendicular to the central axis of the tube, and the width of the non-circular cross-section is greater than its height. This application also discloses a heat exchanger core and a heat exchanger. The heat exchanger tube according to this application, made of cast iron with a non-circular cross-section, is easy to seal and has high resistance to dew point corrosion and high heat exchange efficiency. The heat exchanger core and heat exchanger according to this invention enable a detachable floating seal for the heat exchanger tube, further avoiding sealing problems. Furthermore, because the heat exchanger tube is easy to replace, maintenance is convenient and operating costs are low.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery in industries such as oil refining and chemical processing, and specifically to improved heat exchanger plates, heat exchanger cores, and heat exchangers. Background Technology

[0002] Heat exchangers are widely used in flue gas waste heat recovery systems in industries such as petroleum, chemical, metallurgy, power, and machinery. They are used to cool high-temperature flue gas and recover waste heat.

[0003] However, high-temperature flue gas generally contains corrosive gaseous components, such as sulfur dioxide. When sulfur dioxide combines with water vapor in the flue gas, and the temperature of the heat exchanger tube wall drops below its dew point, it condenses into an acidic liquid on the tube wall, causing corrosion. This phenomenon is called dew point corrosion. Over time, it can even lead to perforation and leakage of the heat exchanger tubes, affecting the heat exchange efficiency and service life. On the other hand, increasing the heat exchanger tube wall temperature to avoid dew point corrosion would result in wasted heat from the high-temperature flue gas, reducing heat exchange efficiency.

[0004] Cast iron is considered an ideal material for heat exchangers due to its corrosion and wear resistance, low cost, and good thermal conductivity. However, due to limitations in casting processes, existing heat exchangers using cast iron are typically plate heat exchangers. The heat exchange plates, made of cast iron, are connected by bolts and nuts to form high-temperature flue gas channels. The large planar seals between these heat exchange plates are prone to leakage. Furthermore, because all the heat exchange plates are fixed together as a single unit, significant differences in thermal expansion due to temperature variations can generate large, unreleased localized stresses, causing deformation. Excessive deformation can also lead to misalignment of the heat exchange plates, resulting in leaks. When a leak occurs, the entire heat exchange plate needs to be replaced, resulting in high maintenance costs.

[0005] Therefore, it is necessary to develop a heat exchanger and its heat exchange components that can solve or at least alleviate the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a heat exchanger plate tube, a heat exchanger core, and a heat exchanger that at least partially solve the above-mentioned problems.

[0007] According to one aspect of the present invention, a heat exchanger tube is provided, which is made of cast iron and includes a hollow tube body extending in a longitudinal direction and a heat exchanger tube inlet and a heat exchanger tube outlet at both ends of the hollow tube body. The hollow tube body has a non-circular cross-section cut perpendicular to the central axis of the tube, and the width of the non-circular cross-section is greater than its height.

[0008] With current technology, it is no longer a problem to manufacture heat exchanger tubes with a non-circular cross-section and a width greater than the height from cast iron. Using heat exchanger tubes with a non-circular cross-section and a width greater than the height from cast iron will avoid the sealing and leakage problems of existing cast iron heat exchanger plates. Moreover, the heat exchanger tubes are independent of each other, easy to replace, convenient to maintain, and have low operating costs. They also have high resistance to dew point corrosion and high heat exchange efficiency.

[0009] Preferably, the heat exchanger tube includes multiple rows of fins on at least one of the inner and outer surfaces of the side portion along the width direction, the multiple rows of fins being configured to be aligned with or at an angle of less than 90 degrees to the flow direction of the fluid medium flowing across the surface when the heat exchanger tube is in use.

[0010] Heat exchanger tubes made of cast iron are usually large in size, and it is suitable to form fins on the inner and outer surfaces of the heat exchanger tubes to further increase the heat exchange area and enhance the turbulence, thereby further improving the heat exchange efficiency. Setting the fins to be consistent with or at an angle of less than 90 degrees to the flow direction of the fluid medium flowing through the inner and outer surfaces of the heat exchanger tubes during use will also play a role in guiding the flow of the fluid medium.

[0011] Preferably, the fins in each row are continuous fins, and the fins in each row are straight lines, broken lines or curves in their overall extension direction.

[0012] Preferably, the multiple rows of fins are disposed on the inner surfaces of at least two sides of the heat exchange plate tube along the width direction, and the fins on the inner surfaces of the two sides are separated in the height direction.

[0013] Preferably, the fins on the inner surfaces of the two sides are aligned or staggered.

[0014] Preferably, the multiple rows of fins are disposed on the inner surfaces of at least two sides of the heat exchange plate tube along the width direction, and the fins on the inner surfaces of the two sides are continuous in the height direction.

[0015] Fins can be used in various forms as needed to provide different degrees of disturbance to the internal and external fluid media, thus meeting the requirements of various heat exchange conditions.

[0016] Preferably, the non-circular cross-section has parallel straight sides in the width direction.

[0017] Setting the heat exchanger tubes to have a non-circular cross-section with parallel straight sides in the width direction facilitates manufacturing and installation without affecting heat exchange efficiency.

[0018] According to another aspect of the present invention, a heat exchanger core is provided, comprising:

[0019] Multiple heat exchanger tubes are arranged in an array. Each heat exchanger tube includes a hollow tube body extending in the longitudinal direction and a heat exchanger tube inlet and a heat exchanger tube outlet at both ends of the hollow tube body. The hollow tube body has a non-circular cross-section cut perpendicular to the central axis of the tube. The width of the non-circular cross-section is greater than its height.

[0020] A first retaining plate and a second retaining plate, each having through holes corresponding to both ends of the heat exchange plate tube; and

[0021] A sealing element for achieving a detachable floating seal between the through hole and the heat exchange plate tube.

[0022] The heat exchanger core according to the present invention adopts a heat exchange plate tube with a non-circular cross-section having a width greater than its height, and can realize a detachable floating seal between the through hole and the heat exchange plate tube. This can improve heat exchange efficiency while avoiding deformation caused by thermal expansion differences due to temperature differences, thereby avoiding leakage problems.

[0023] Preferably, the heat exchanger tube is any one of the heat exchanger tubes described above.

[0024] The heat exchanger tube core structure according to the present invention is particularly advantageous when the heat exchanger tubes are made of cast iron and include fins at least on the outer surface. First, since the heat exchanger tubes with fins on the outer surface are made of cast iron, the leakage problem caused by the difficulty in sealing between heat exchanger plates made of cast iron in the prior art can be solved, while also having high resistance to dew point corrosion; second, since the sealing element that can be detachably float-sealed to seal the heat exchanger tubes is used, deformation caused by the difference in thermal expansion due to temperature differences can be avoided, thereby avoiding leakage problems caused by deformation.

[0025] Preferably, the through holes corresponding to each row of the heat exchanger tube array along the height direction of the heat exchanger tubes are formed as a combined through hole that runs through the row.

[0026] The combined through-hole allows for easy installation, replacement, and removal of heat exchanger tubes, especially those with fins on at least the outer surface.

[0027] Preferably, the combined through hole is formed to have retaining portions at two ends along the width direction corresponding to the cross-section of the heat exchange plate tube, for engaging with the two ends along the width direction of the cross-section of each heat exchange plate tube to retain each heat exchange plate tube in the row on the first retaining plate and the second retaining plate.

[0028] The shape of the combined through-hole of the heat exchanger core according to the present invention needs to match the outer contour of the heat exchanger tube, and a retaining part should also be provided for holding each heat exchanger tube in place during installation. The retaining part can take many forms; in the present invention, it is sufficient as long as it can hold each heat exchanger tube in place when installed into the combined through-hole. Therefore, the retaining part can have a contour corresponding to the end of the heat exchanger tube to be held in the width direction, or it can be a cut-out portion extending outward from the edge of the combined through-hole, for cooperating with a retaining member additionally provided on the end of the heat exchanger tube in the width direction of the cross-section.

[0029] Preferably, the sealing element includes a sealing strip, which is disposed at least in the gap between the outer surface of the heat exchange plate tube and the edge of the combined through hole; and a pressure element for sealing the gap between the edge of the combined through hole and the outer surface of the heat exchange plate tube.

[0030] The seal according to the invention is used to achieve a removable, floating seal between the combined through-hole and the heat exchanger tube array. Any type of seal capable of achieving this sealing function is applicable.

[0031] Preferably, the pressure member includes a pressure cap and a pressure strip. The pressure strip is used to seal the gap between the sides of adjacent heat exchanger tubes along the width direction or between the edge of the combined through hole and the side of the heat exchanger tube along the width direction. The pressure cap is used to seal the gap between the end of the heat exchanger tube along the width direction and the corresponding edge of the combined through hole and to press the sealing strip.

[0032] The pressure member according to the present invention is not limited to the structure described above. The pressure cover and pressure strip can be integrally formed, and even all the pressure covers and pressure strips that close the joint through hole can be integrally formed, as long as the gap between the edge of the closed joint through hole and the outer surface of the heat exchange plate tube can be achieved.

[0033] Preferably, the pressure strip includes a skeleton and a sealing material, and the sealing material is at least disposed on the surface of the skeleton corresponding to the gap closed by the pressure strip and on the surface corresponding to the side portion of the heat exchange plate tube along the width direction.

[0034] According to a preferred embodiment of the present invention, the pressure strip may include a skeleton and a sealing material. The skeleton is used to provide sufficient strength to close the gap between the end of the heat exchange plate tube in the width direction and the corresponding edge of the combined through hole. The sealing material is used to seal the pressure strip with the sidewall of the heat exchange plate tube in the width direction and to avoid hard contact between the skeleton of the pressure strip and the sidewall of the heat exchange plate tube in the width direction.

[0035] Preferably, the combined through hole is a stepped hole, which forms a receiving space for the sealing strip with the outer surface of the heat exchange plate tube. The sealing strip includes a main body portion corresponding to the gap between the sides of the heat exchange plate tube in the width direction or between the side of the heat exchange plate tube in the width direction and the edge of the combined through hole, and a flange extending from the main body portion in the width direction to the step of the stepped hole. The flange is fixed to the step by a detachable fastener.

[0036] According to a preferred embodiment of the present invention, the combined through hole is formed as a stepped hole on the retaining plate, and a step is formed on the outline edge of the combined through hole. After the heat exchange plate tube is installed in place, an accommodating space formed by the step, the inner surface of the combined through hole, and the outer surface of the heat exchange plate tube is left between the outer surface of the heat exchange plate tube and the outline edge of the combined through hole, so that the sealing strip can be evenly placed in the accommodating space.

[0037] Preferably, the sealing strip and sealing material are high-temperature resistant carbon fiber or ceramic fiber, the skeleton and cover of the pressure strip are metal parts, and the pressure member is fixed to the first retaining plate or the second retaining plate by a detachable fastener.

[0038] According to another aspect of the present invention, a heat exchanger is provided, comprising:

[0039] The housing includes a first fluid medium inlet, a first fluid medium outlet, a second fluid medium inlet, and a second fluid medium outlet.

[0040] According to the heat exchanger core described above, its first retaining plate and second retaining plate are respectively sealed and connected to the shell. The first fluid medium inlet and the first fluid medium outlet are correspondingly provided with the heat exchanger tube inlet and heat exchanger tube outlet of the heat exchanger core. The second fluid medium inlet and the second fluid medium outlet are correspondingly provided with the side of the heat exchanger tube along the height direction.

[0041] The heat exchanger according to the present invention has all the advantages of a heat exchanger core due to the use of the heat exchanger core according to the present invention.

[0042] In summary, the heat exchanger tubes of the present invention, made of hollow tubes from cast iron with a non-circular cross-section, are easy to seal and possess high resistance to dew point corrosion and high heat exchange efficiency. The heat exchanger core and heat exchanger of the present invention enable detachable floating seals for the heat exchanger tubes, further avoiding sealing problems. Furthermore, because the heat exchanger tubes are easy to replace, maintenance is convenient and operating costs are low. Attached Figure Description

[0043] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0044] Figure 1 This is a perspective view of the heat exchanger plate tube according to the first embodiment of the present invention;

[0045] Figure 2 yes Figure 1 The front view of the heat exchanger tubes shown;

[0046] Figure 3 yes Figure 1 Side view of the heat exchanger tubes shown;

[0047] Figure 4 yes Figure 1 The front sectional view of the heat exchanger tube shown;

[0048] Figure 5 yes Figure 1 A top view of the heat exchanger tubes shown;

[0049] Figures 6 to 8 This is a top view of the heat exchange plate tube according to the second to fourth embodiments of the present invention;

[0050] Figure 9 and Figure 10 These are front views of the heat exchanger tubes according to the fifth and sixth embodiments of the present invention;

[0051] Figure 11 and Figure 12 These are front sectional views of the heat exchanger plate tube according to the seventh and eighth embodiments of the present invention;

[0052] Figure 13 This is a perspective view of an embodiment of the heat exchanger core according to the present invention;

[0053] Figure 14 yes Figure 13 The front view of the heat exchanger core shown;

[0054] Figure 15 yes Figure 13 Side view of the heat exchanger core shown;

[0055] Figure 16 yes Figure 13 The front view of the heat exchanger core after removing the pressure strips and gland is shown.

[0056] Figure 17 yes Figure 13 Front view of the first retaining plate of the heat exchanger core shown;

[0057] Figure 18 It is along Figure 14 A partial sectional view and a magnified partial view of the heat exchanger core taken from section AA in the image;

[0058] Figure 19 It is along Figure 14 A partial sectional view and a magnified partial view of the heat exchanger core taken from section BB;

[0059] Figure 20 It is a schematic display Figure 15 The front view, top view, side view, and perspective view of the skeleton of the molding strip are shown.

[0060] Figure 21 It is a schematic display Figure 15 The front view, side view, and perspective view of the molding strip are shown.

[0061] Figure 22 yes Figure 14 and Figure 15 The front view and perspective view of the pressure cap are shown;

[0062] Figure 23 yes Figure 13 Front and perspective views of another form of gland used in the embodiment of the heat exchanger core shown;

[0063] Figure 24 These are front views, top views, and perspective views of an embodiment of a metal part in which the frame and the cover of the pressure strip are integrated;

[0064] Figure 25 This is a perspective view of an embodiment of a heat exchanger employing the heat exchanger core according to the present invention;

[0065] Figure 26 yes Figure 25 The side view of the heat exchanger shown. Detailed Implementation

[0066] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0067] In this invention, the terms "upper," "lower," "inner," "outer," "center," and "longitudinal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, component, or part to having a specific orientation, or to be constructed and operated in a specific orientation.

[0068] Figure 1 This is a perspective view of a heat exchanger plate tube according to an embodiment of the present invention. Figure 2 yes Figure 1 The front view of the heat exchanger tubes shown. Figure 3 yes Figure 1 The side view of the heat exchanger plate tubes shown. Also refer to... Figures 1 to 3 In the accompanying drawings, the heat exchanger tube is generally designated as 100. The heat exchanger tube 100 is made of cast iron and includes a hollow tube body 111 extending longitudinally and heat exchanger tube inlets 114 and outlets 113 at both ends of the hollow tube body 111. Multiple rows of external fins 112 are included on the outer surface of the side portion of the heat exchanger tube 100 along its width direction. These multiple rows of external fins 112 are arranged in a straight line along their extension direction and are aligned with the flow direction of the external fluid medium flowing across the outer surface of the heat exchanger tube 100 during use. Typically, the heat exchanger tube 100 is configured such that the side portion of the heat exchanger tube 100 along its height direction faces the external fluid medium. The flow direction of the external fluid medium on the outer surface of the heat exchanger tube 100 is perpendicular to the longitudinal direction of the hollow tube body 111; therefore, the multiple rows of external fins 112 are shown in the figure as being approximately perpendicular to the longitudinal direction of the hollow tube body 111.

[0069] Figure 4 yes Figure 1 The front sectional view of the heat exchanger tube 100 shown. Figure 4 As seen in the figure, the inner surface of the side portion of the heat exchanger tube 100 along its width direction includes multiple rows of inner fins 115. These multiple rows of inner fins 115 are configured to align with the flow direction of the fluid medium flowing through the inner surface of the heat exchanger tube 100 during use. Typically, the heat exchanger tube 100 is configured such that the fluid medium enters from the heat exchanger tube inlet 114 and exits from the heat exchanger tube outlet 113. The flow direction of the fluid medium on the inner surface of the heat exchanger tube 100 is along the longitudinal direction of the hollow tube body 111 of the heat exchanger tube. Therefore, the figure shows that the multiple rows of inner fins 115 are approximately parallel to the longitudinal direction of the hollow tube body 111 of the heat exchanger tube.

[0070] In this way, the arrangement of the inner fins 115 and the outer fins 112 not only does not hinder the flow of the fluid medium, but also guides the flow of the fluid medium inside and outside the pipe, and promotes the turbulence of the fluid medium, thereby improving the heat exchange efficiency.

[0071] Figure 5 yes Figure 1 The top view of the heat exchanger plate tubes shown. From Figure 5 As seen in the image, the heat exchanger 100 has an elongated oval cross-section with parallel straight sides along its width. Multiple rows of outer fins 112 are provided on the outer surfaces of both sides of the heat exchanger tube 100 along its width, and multiple rows of inner fins 115 are provided on the inner surfaces of both sides along its width. The inner fins 115 are separated and aligned in the height direction.

[0072] Figures 6 to 8This is a top view of the heat exchange plate tube according to the second to fourth embodiments of the present invention. Figures 6 to 8 Zhongyu Figure 1-5 The same or similar parts are indicated by the same reference numerals, only relative to the reference numerals. Figure 1-5 The reference numerals in the diagrams increase by 1 sequentially before the first digit. Figure 1-5 The same technical features of the embodiments shown will not be described again for the sake of brevity.

[0073] from Figure 6 As seen in the image, the heat exchanger tube 200 of this second embodiment has an elongated oval cross-section, with parallel straight edges along its width. Multiple rows of inner fins 215 are provided on the inner surfaces of both sides of the heat exchanger tube 200 along its width, and these inner fins 215 are separated and staggered in the height direction. Figure 7 As seen in the image, the heat exchanger tube 300 of this third embodiment has an elongated oval cross-section, with parallel straight edges along its width. Multiple rows of inner fins 315 are provided on the inner surfaces of both sides of the heat exchanger tube 300 along its width, and the inner fins 315 on the inner surfaces of the two sides are continuous in the height direction.

[0074] Figure 8 In the fourth embodiment, the heat exchange plate tube 400 has parallel straight sides in the width direction and a pointed non-circular cross-sectional shape in the height direction, and the width of the cross-section is greater than the height.

[0075] The heat exchanger tubes of the second and third embodiments differ from those of the first embodiment only in the distribution of the inner fins on the inner surfaces of the two sides along the width direction. The heat exchanger tube of the fourth embodiment differs from that of the first embodiment only in its cross-sectional shape; the rest of the structure is the same as that of the first embodiment. The distribution of the inner fins in the first to third embodiments provides different degrees of disturbance to the internal flow medium of the heat exchanger tube, meeting the needs of various heat exchange conditions.

[0076] Figure 9 and Figure 10 These are front views of the heat exchanger plate tube according to the fifth and sixth embodiments of the present invention, wherein the same or similar parts are labeled with the same reference numerals as in the previously shown embodiments, only relative to... Figure 8 The reference numerals in the diagrams increase by 1 sequentially before the first digit. From Figure 9 As can be seen, in the fifth embodiment, the heat exchanger tube 500 has outer fins 512 on the outer surface of its side portion along the width direction. The outer fins 512 are linear in their extending direction, but their extending direction is not perpendicular to the extending direction of the heat exchanger tube 500, but rather forms an angle of less than 90 degrees with it. Figure 10As can be seen, in the sixth embodiment, the heat exchange plate tube 600 has outer fins 612 on the outer surface of its side portion along the width direction. The outer fins 612 are zigzag-shaped in their extension direction, but their overall extension direction is parallel to the extension direction of the heat exchange plate tube 600. The remaining structures of the fifth and sixth embodiments are the same as those of the first embodiment.

[0077] Figure 11 and Figure 12 These are front sectional views of the heat exchanger plate tube according to the seventh and eighth embodiments of the present invention, wherein the same or similar components are labeled with the same reference numerals as in the previously shown embodiments, only relative to... Figure 10 The reference numerals in the diagrams increase by 1 sequentially before the first digit. From Figure 11 As can be seen, in the seventh embodiment, the heat exchanger tube 700 has inner fins 715 on the inner surface of its side portion along the width direction. The inner fins 715 are straight in their extending direction, but are not parallel to the extending direction of the heat exchanger tube 700; instead, they form an angle of less than 90 degrees with the extending direction of the heat exchanger tube 700. From Figure 12 As can be seen, the heat exchanger tube 800 of the eighth embodiment has inner fins 815 on the inner surface of its side portion along the width direction. The inner fins 815 are zigzag-shaped in their extension direction, but their overall extension direction is parallel to the extension direction of the heat exchanger tube 800. The distribution of the outer fins in the first, seventh, and eighth embodiments provides different degrees of disturbance to the external flow medium of the heat exchanger tube.

[0078] Figures 1 to 12 Various embodiments of the heat exchanger tube according to the present invention are shown. The shown embodiments are merely exemplary, and new embodiments of the heat exchanger tube (not shown) obtained by reducing, arranging, or replacing similar technical features in the shown embodiments are also within the scope of protection of the present invention. Therefore, heat exchanger tubes made of cast iron without fins and with a non-circular cross-section are also within the scope of protection of the present invention.

[0079] The heat exchanger tubes made of cast iron and having a non-circular cross-section with a width greater than its height, according to the present invention, avoid the sealing and leakage problems of cast iron heat exchanger plates in the prior art. Furthermore, the heat exchanger tubes are independent of each other, easy to replace, convenient to maintain, and have low operating costs, while also exhibiting high resistance to dew point corrosion and high heat exchange efficiency. Embodiments of the present invention with heat exchanger tubes having different forms of inner and outer fins can further increase the heat exchange area and enhance turbulence, thereby further improving heat exchange efficiency.

[0080] Figure 13 This is a perspective view of an embodiment of the heat exchanger core according to the present invention. Figure 14 yes Figure 13 The front view of the heat exchanger core shown. Figure 15 yes Figure 13The diagram shows a side view of the heat exchanger core. The heat exchanger core is generally indicated by reference numeral 10. The heat exchanger core 10 includes multiple heat exchanger tubes 100' arranged in a 3-row, 7-column array, the heat exchanger tubes 100' being any of the heat exchanger tubes described above. The heat exchanger core 10 also includes a first retaining plate 101 and a second retaining plate 102, each having through holes corresponding to the two ends of the heat exchanger tubes 100'. The heat exchanger core 10 also includes a seal for achieving a detachable floating seal between the through holes and the heat exchanger tubes 100'. The seal includes a sealing strip (see...). Figure 18 and Figure 19 The sealing strip 106 and the pressure member are in the middle. Figure 13 and Figure 14 The image shows a pressure cap 103 and a pressure strip 104.

[0081] Figure 16 yes Figure 13 The front view of the heat exchanger core after removing the pressure bars and glands is shown. Figure 17 yes Figure 13 A front view of the first retaining plate of the heat exchanger core shown. Figure 16 As can be clearly seen, the heat exchanger core 10' includes external fins in its heat exchanger plate tube 100'. To facilitate the installation and removal of this finned heat exchanger plate tube 100', it is designed to... Figure 16 The through holes corresponding to each row (i.e., the heat exchange tube array in the vertical direction) of the array of 3 rows and 7 columns of heat exchange tubes 100' shown are formed as joint through holes 105 that run through the row.

[0082] The following is combined Figure 16 and Figure 17 The combined through-hole 105 is described. From Figure 17 As can be seen, the combined through-hole 105 on the first retaining plate 101 is formed with retaining portions 109 at both ends of the heat exchange plate tube 100' in the width direction corresponding to the cross-section of the heat exchange plate tube 100'. That is, the portion of the combined through-hole 105 surrounding the ends of the heat exchange plate tube 100' in the width direction, shown as two semicircular arcs in this embodiment, are used to mate with the two sides of the heat exchange plate tube 100' in the height direction of the cross-section of the heat exchange plate tube 100' to retain each heat exchange plate tube 100' in the row on the first retaining plate 101 and the second retaining plate (not shown in the figure). Figure 16As can be seen, when each heat exchanger tube 100' is installed into the connecting through hole 105, since the distance between the opposite ends of the two arcs of the retaining portion 109 corresponding to the heat exchanger tube 100' is set to be greater than the width of the outer fins on the outer surface of the heat exchanger tube 100', the connecting through hole 105 of the present invention allows each heat exchanger tube 100' with outer fins to be easily installed onto the first retaining plate 101 and the second retaining plate through the connecting through hole 105, and to be easily replaced and disassembled, facilitating maintenance. A sealing strip 106 is disposed in the gap between the side portion of each heat exchanger tube 100' along the height direction and the connecting through hole 105.

[0083] Figure 18 It is along Figure 14 A partial sectional view and a magnified partial view of the heat exchanger core 10 taken from section AA. Figure 19 It is along Figure 14 The image shows a partial sectional view and a magnified partial view of the heat exchanger core 10 taken from section BB. The following will refer to... Figure 14 , 17 arrive Figure 19 The sealing between the heat exchange plate tube 100' and the first retaining plate 101 in the heat exchanger core 10 according to this embodiment is described in detail.

[0084] from Figure 17 As can be seen, in this embodiment, the combined through hole 105 is a stepped hole, including step 108. Combined with... Figure 18 and Figure 19 As can be seen, the stepped hole and the outer surface of the heat exchange plate tube 100' installed therein form a receiving space for the sealing strip 106. The sealing strip 106 can be evenly arranged in the receiving space between the outer surface of the heat exchange plate tube 100' and the edge of the combined through hole 105.

[0085] Return to reference Figure 14 and combined Figure 18 and Figure 19 It can be seen that the pressure strip 104 is used to seal the gap between the sides of adjacent heat exchange plate tubes 100' along the width direction or between the edge of the joint through hole 105 and the side of the heat exchange plate tube 100' along the width direction, and the pressure cap 103 is used to seal the gap between the end of the heat exchange plate tube 100' along the width direction and the edge of the corresponding joint through hole 105.

[0086] Figure 20 It is a schematic display Figure 15 The front view, top view, side view, and perspective view of the skeleton of the molding strip are shown. Figure 21 It is a schematic display Figure 15 The front view, side view, and perspective view of the molding strip are shown. Combined Figure 20 and 21As can be seen, the pressure strip 104 includes a skeleton 1041 and a sealing material 1042 surrounding the skeleton 1041 circumferentially. From Figure 21 It can also be seen that the pressure strip 104 includes a thicker main body portion in the middle and a flange 1043 extending from the main body portion along the extension direction. The thickness of the flange 1043 is less than the thickness of the main body portion. In this embodiment, the flange 1043 also includes a skeleton and a sealing material surrounding the skeleton circumferentially. (See also...) Figure 20 The corresponding skeleton part of the flange 1043 also includes fastener holes 1044 for fixing the pressure strip 104.

[0087] See back Figure 18 and Figure 19 In this embodiment, the flange 1043 of the pressure strip 104 rests on the step 108. The flange 1043 is usually fixed to the step 108 by a fastener 107, which can be a screw or a bolt.

[0088] Figure 22 yes Figure 14 and Figure 15 The front view and perspective view of the pressure cap are shown; Figure 23 yes Figure 13 Front and perspective views of another form of gland used in the embodiment of the heat exchanger core shown. From Figure 22 As can be seen, the shapes of the two side edges of the pressure cap 103 are adapted to the end contour of the heat exchange tube 100'. The heat exchange tube in this embodiment has an elongated oval cross-section, so the shape of each side edge of the pressure cap 103 is half the shape of the end contour of the heat exchange tube 100'. The pressure cap 103 also includes fastener holes 1031 for fixing the pressure cap 103. Figure 23 The gland 203 shown is designed to close and press the sealing strip between the uppermost and lowermost heat exchanger tubes installed in each of the combined through holes and the edge of the combined through hole. The gland 203 also includes fastener holes 2031 for securing the gland 203.

[0089] The sealing strip and sealing material of the present invention are high-temperature resistant carbon fiber and ceramic fiber. The skeleton of the pressure strip 104 can be a ceramic part or a metal part, and the pressure cover 103 is a metal part.

[0090] Return to combination Figure 14 , Figure 16 and Figure 17 It can be seen more clearly that the pressure strip 104 and the pressure cap 103 are connected by fasteners 107, fastener holes 1044 on the skeleton 1041 of the pressure strip 104 and fastener holes 1031 on the pressure cap 103. Figure 16 and Figure 17The fastener hole 110 shown is fixed to the first retaining plate 101. Therefore, it can be seen that the cap 103 and sealing strip 106 of the heat exchanger core 10 according to the present invention do not cover the end face of the heat exchange plate tube 100', that is, the end of the heat exchange plate tube is in a freely extendable state, thereby ensuring that the heat exchange plate tube 100' can expand freely after being heated, avoiding stress deformation. Moreover, the structure of the cap 103, sealing strip 106, and pressure strip 104 can achieve a reliable seal between the heat exchange plate tube 100' and the first support plate 101 or the second support plate 102, with a leakage rate of zero, thereby further improving heat exchange efficiency.

[0091] The above is about Figures 13 to 23 The description of the preferred embodiment of the heat exchanger core 10 shown herein is based on the following various alternative embodiments of the heat exchanger core 10 according to the present invention.

[0092] The heat exchanger core 10 of the present invention can be a heat exchanger tube 100' without external fins, or it can be a heat exchanger tube made of materials other than cast iron with the same structure as the heat exchanger tube described above. The through holes on the first retaining plate 101 and the second retaining plate 102 can have the same profile as the heat exchanger tube, i.e., not a combined through hole, or they can be combined through holes. Referring to the preceding text... Figures 13 to 23 The described seals also apply.

[0093] Reference Figures 13 to 23 The retaining portion 109 in the described embodiment of the heat exchanger core 10 can take various forms, as long as it can hold each heat exchanger tube in place when it is installed into the connecting through-hole. The retaining portion can be a part of the connecting through-hole surrounding the end of the heat exchanger tube along the width direction, and its shape varies with the cross-sectional shape of the heat exchanger tube. For example, the connecting through-hole may have a portion corresponding to the profile of the tip of the heat exchanger tube along the width direction as shown in the fourth embodiment. The retaining portion can also be a cut-out portion extending outward from the edge of the connecting through-hole, which cooperates with a retaining member additionally provided on the end of the heat exchanger tube along the width direction of its cross-section. For example, a protrusion is provided on the side of the heat exchanger tube along the height direction at a position corresponding to the first and second retaining plates, and a groove extending away from the through-hole is provided on the profile of the connecting through-hole corresponding to the side of the heat exchanger tube along the height direction. The heat exchanger tube is held in place by the protrusion engaging within the groove. In this case, the overall profile shape of the connecting through-hole is not limited and can be any shape that facilitates the installation and removal of the heat exchanger tube.

[0094] The sealing element of the heat exchanger core according to the present invention is not limited to the one described above. Figures 13 to 23The sealing strip is not limited to being positioned solely within the gap between the outer surface of the heat exchanger tube and the edge of the combined through-hole; it can be configured to surround the outer periphery of the heat exchanger tube corresponding to the location of the combined through-hole. The installation method of the gland and the sealing strip is also not limited to... Figures 13 to 23 The pressure cap 103 shown presses onto the pressure strip 104 and is then fixed to the first retaining plate 101 or the second retaining plate 102 by screws. For example, the pressure strip may press onto the pressure cap, or the pressure strip and the pressure cap may abut against each other and then be fixed to the first retaining plate or the second retaining plate by screws, respectively.

[0095] According to the present invention, the sealing material of the pressure strip is not limited to... Figure 21 The sealing material 1042 of the pressure strip 104 shown is disposed in the following manner. The sealing material is provided at least on the surface of the frame corresponding to the gap closed by the pressure strip and on the surface corresponding to the side portion of the heat exchange plate tube along the width direction. For example, the sealing material may only be wrapped around the main body portion of the frame 1041 with a relatively large thickness, and the flange portion 1043 may not include the sealing material, or the sealing material may only be bonded to the bottom and side surfaces of the main body portion of the frame 1041 with a relatively large thickness, and the upper surface may not be provided with the sealing material.

[0096] When both the frame and the cover of the pressure strip are metal parts, the frame and cover of the pressure strip are not limited to... Figures 13 to 23 The split form shown can be formed into a single metal part.

[0097] Figure 24 These are schematic front views, top views, and perspective views illustrating an embodiment of a metal component where the frame and cap of the pressure strip are integrated. The integrated metal component, generally designated 2041', includes a centrally located pressure strip portion 2041 with a greater thickness and cap portions 2043 at the ends. A sealing material is provided at the pressure strip portion 2041, and fastener holes 2044 are provided at the ends of the cap portions 2043 and the pressure strip portion 2041. The integrated metal component 2041', together with the sealing material, is secured to a first or second retaining plate by fasteners. Each side edge of the integrated metal component 2041' has a profile shape that bisects half of the non-circular cross-section of the heat exchange plate tube 100' along its width direction.

[0098] Figures 13 to 23 Another embodiment (not shown) of the heat exchanger core 10 shown can also be implemented in which the skeleton of all the pressure strips for a retaining plate and all the pressure caps are integrally formed into an integral metal plate, and an array of through holes corresponding to the heat exchanger tube array is formed therein, and a sealing material is provided at the hole edge of each through hole in the array of through holes corresponding to the side of the heat exchanger tube along the width direction.

[0099] The combined through hole of the heat exchanger core according to the present invention is not necessarily a stepped hole; a straight through hole is also feasible.

[0100] The heat exchanger core according to the present invention employs a heat exchange plate tube with a non-circular cross-section having a width greater than its height, and achieves a detachable, floating seal between the through hole and the heat exchange plate tube. This improves heat exchange efficiency while avoiding deformation caused by thermal expansion differences due to temperature differences, thereby preventing leakage problems.

[0101] Figure 25 This is a perspective view of a heat exchanger embodiment using the heat exchanger core according to the present invention. Figure 26 yes Figure 25 The heat exchanger shown is a side view. The heat exchanger as a whole is indicated by reference numeral 1 in the attached figure. Figures 13 to 24 The heat exchanger core 10 shown is sealed to the housing 11 of the heat exchanger 1 via a first retaining plate 101 and a second retaining plate 102, forming... Figure 25 and Figure 26 The heat exchanger 1 shown is shown. Figure 25 Arrow 12 in the diagram indicates the fluid medium flowing outside the heat exchange tube 100'. Figure 26 Arrow 13 in the figure indicates the fluid medium flowing through the interior of heat exchange tube 100'.

[0102] The heat exchanger according to the present invention has all the advantages of a heat exchanger core due to the use of the heat exchanger core according to the present invention.

[0103] In summary, the heat exchanger tubes of the present invention, made of hollow tubes from cast iron with a non-circular cross-section, are easy to seal and possess high resistance to dew point corrosion and high heat exchange efficiency. The heat exchanger core and heat exchanger of the present invention enable detachable floating seals for the heat exchanger tubes, further avoiding sealing problems. Furthermore, the heat exchanger tubes are easy to replace, convenient to maintain, and have low operating costs.

[0104] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A heat exchanger core, comprising: Multiple heat exchanger tubes are arranged in an array. Each heat exchanger tube includes a hollow tube body extending in the longitudinal direction and a heat exchanger tube inlet and a heat exchanger tube outlet at both ends of the hollow tube body. The hollow tube body has a non-circular cross-section cut perpendicular to the central axis of the tube. The width of the non-circular cross-section is greater than its height. The first retaining plate and the second retaining plate are respectively provided with through holes corresponding to the two ends of the heat exchange plate tube; and A sealing element, which does not cover the end face of the heat exchange plate tube, is used to achieve a detachable floating seal between the through hole and the heat exchange plate tube. The heat exchange plate tube includes multiple rows of fins, and the multiple rows of fins include outer fins disposed on the outer side surface of the heat exchange plate tube along the width direction. The through holes corresponding to each row of the heat exchanger tube array along the height direction of the heat exchanger tubes are formed as a combined through hole extending through the row. The combined through hole is formed with retaining portions at two ends of the cross-section of the heat exchanger tube along the width direction, respectively, for cooperating with the two ends of the cross-section of each heat exchanger tube along the width direction to retain each heat exchanger tube in the row on the first retaining plate and the second retaining plate. The distance between the retaining portions is set to allow the heat exchanger tube with the outer fins to pass through the combined through hole.

2. The heat exchanger core according to claim 1, wherein, The heat exchanger tubes are made of cast iron.

3. The heat exchanger core according to claim 2, wherein, The multi-row fins also include multiple rows of inner fins disposed on the inner side surface of the heat exchange plate tube along the width direction.

4. The heat exchanger core according to claim 1 or 2, wherein, The outer fins are configured to be aligned with or at an angle of less than 90 degrees to the flow direction of the fluid medium flowing through the outer surface of the side portion when the heat exchange plate tube is in use.

5. The heat exchanger core according to claim 4, wherein, Each row of fins is a continuous fin, and the fins in each row are straight lines, broken lines, or curves in their overall extension direction.

6. The heat exchanger core according to claim 3, wherein, The inner fins, which are disposed on the inner surfaces of the two sides of the heat exchange plate tube along the width direction, are separated in the height direction.

7. The heat exchanger core according to claim 6, wherein, The inner fins on the inner surfaces of the two sides are aligned or staggered.

8. The heat exchanger core according to claim 3, wherein, The inner fins, which are disposed on the inner surfaces of the two sides of the heat exchange plate tube along the width direction, are continuous in the height direction.

9. The heat exchanger core according to claim 2, wherein, The non-circular cross-section has parallel straight sides along its width.

10. The heat exchanger core according to claim 1, wherein, The sealing element includes a sealing strip, which is disposed at least in the gap between the outer surface of the heat exchange plate tube and the edge of the combined through hole; and a pressure element for sealing the gap between the edge of the combined through hole and the outer surface of the heat exchange plate tube.

11. The heat exchanger core according to claim 10, wherein, The pressure member includes a pressure cap and a pressure strip. The pressure strip is used to seal the gap between the sides of adjacent heat exchanger tubes along the width direction or between the edge of the combined through hole and the side of the heat exchanger tube along the width direction. The pressure cap is used to seal the gap between the end of the heat exchanger tube along the width direction and the corresponding edge of the combined through hole and to press the sealing strip.

12. The heat exchanger core according to claim 11, wherein, The pressure strip includes a skeleton and a sealing material. The sealing material is provided on at least the surface of the skeleton corresponding to the gap closed by the pressure strip and the surface corresponding to the side of the heat exchange plate tube along the width direction.

13. The heat exchanger core according to claim 12, wherein, The combined through hole is a stepped hole, which forms a receiving space for the sealing strip with the outer surface of the heat exchange plate tube. The pressure strip includes a main body portion corresponding to the gap between the sides of the heat exchange plate tube in the width direction or between the side of the heat exchange plate tube in the width direction and the edge of the combined through hole, and a flange extending from the main body portion in the width direction to the step of the stepped hole. The flange is fixed to the step by a detachable fastener.

14. The heat exchanger core according to any one of claims 11-13, wherein, The sealing strip and sealing material are high-temperature resistant carbon fiber and ceramic fiber. The frame of the pressure cap and pressure strip is a metal part. The pressure part is fixed to the first retaining plate or the second retaining plate by detachable fasteners.

15. A heat exchanger, comprising: The housing includes a first fluid medium inlet, a first fluid medium outlet, a second fluid medium inlet, and a second fluid medium outlet. According to any one of claims 1-14, the heat exchanger core has a first retaining plate and a second retaining plate respectively sealed to the shell, the first fluid medium inlet and the first fluid medium outlet are correspondingly provided to the heat exchanger tube inlet and heat exchanger tube outlet of the heat exchanger core, and the second fluid medium inlet and the second fluid medium outlet are correspondingly provided to the side of the heat exchanger tube along the height direction.

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