A high-strength flat tube heat exchange tube, a heat exchanger with non-contact thermal resistance fins and its processing technology

Abstract

The present invention relates to the field of heat exchanger technology, and in particular to a high-strength flat tube heat exchange tube, a heat exchanger with contactless thermal resistance fins and a processing technology thereof, comprising a base tube, the base tube being a round tube structure before processing, the base tube comprising a water inlet pipe section and a water outlet pipe section at both ends and a processing section located therebetween, an extrusion section is arranged at intervals on the processing section, a bending section is arranged between the extrusion sections, the extrusion section is in contact with the bending section, and an external extrusion mechanism extrudes the cross section of the extrusion section into a flat elliptical shape by extruding the two ends of the extrusion section. The present invention extrude the traditional round tube into a flat tube, i.e., a tube structure with a flat elliptical cross section, and uses two elliptical structure parts as the windward side and the leeward side. Compared with a round tube under the same water flow conditions, the present invention has a smaller windward area, reduces the possibility of smoke flow obstruction, and is conducive to enhancing the heat exchange performance.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, in particular to a high-strength flat tube heat exchange tube, a heat exchanger with non-contact thermal resistance fins and a processing technology thereof. Background Art

[0002] In order to improve the heat exchange effect between high-temperature flue gas and low-temperature water on both sides of the heat transfer tube, traditional heat exchangers will set fins on the heat transfer tube to increase the heat exchange area. At present, the main high-temperature heat exchanger is the shell-and-tube heat exchanger. The base tube and fin of the tube-and-fin heat exchanger are processed separately. The heat exchange tube is mostly a round tube structure, with a large windward area and large smoke flow resistance. At the same time, it also makes the smoke flow on the leeward side less smooth.

[0003] Therefore, the prior art is insufficient and needs to be improved. Summary of the invention

[0004] The technical problem to be solved by the embodiments of the present invention is that the base tube and the fins of the tube-fin heat exchanger are processed separately, and there is a certain contact thermal resistance.

[0005] In order to solve the above problems, an embodiment of the present invention provides a high-strength flat tube heat exchange tube, including a base tube, which is a round tube structure before processing, and includes a water inlet pipe section and a water outlet pipe section located at both ends and a processing section located therebetween, and extrusion sections are arranged at intervals on the processing section, and bending sections are arranged between the extrusion sections, and at least one bending section is arranged, and the extrusion sections are in contact with the bending sections, and an external extrusion mechanism extrudes the cross-section of the extrusion section into a flat elliptical shape by extruding the two ends of the extrusion section, and an extrusion area is arranged on the bending section, and the extrusion area is perpendicular to the extrusion surface of the extrusion section, and the external extrusion mechanism deforms the bending section part by extruding the extrusion area, and an inner bending area is arranged on each of the bending sections, and the inner bending area is arranged perpendicular to the extrusion area, and the external bending mechanism bends the bending section through the inner bending area so that the extrusion sections on both sides of the inner bending area are arranged relatively.

[0006] Optionally, adjacent inner bending areas are alternately arranged at both ends of the bending section.

[0007] Optionally, both ends of the extruded section are set as fin opening areas, and a plurality of groups of heat exchange fins are opened on the extruded section corresponding to the fin opening area by a fin cutting and tooth-scraping process.

[0008] Optionally, the water inlet pipe section includes a water inlet and a first connecting section, and two ends of the first connecting section are respectively connected to the processing section and the water inlet.

[0009] Optionally, the water outlet pipe section includes a water outlet and a second connecting section, and two ends of the second connecting section are respectively connected to the processing section and the water outlet.

[0010] An embodiment of the present invention provides a heat exchanger with contact-free thermal resistance fins, including the high-strength flat tube heat exchange tube described above, and also including a first adapter and a second adapter, wherein the first adapter is fixedly connected to the water inlet pipe section, and the second adapter is fixedly connected to the water outlet pipe section.

[0011] Optionally, a surface protrusion structure is arranged in the base tube.

[0012] The embodiment of the present invention provides a processing technology for the heat exchanger with non-contact thermal resistance fins, comprising the following steps:

[0013] Step S1: providing a base tube in a round tube structure;

[0014] Step S2: extruding the extruded section on the base pipe so that the cross section of the extruded section is a flat ellipse;

[0015] Step S3: Arranging a plurality of surface protrusion structures in the base tube;

[0016] Step S4: Extruding the bending section through the extrusion area so that the bending section is partially deformed;

[0017] Step S5: providing a plurality of groups of heat exchange fins on the extrusion section;

[0018] Step S6: bending the bending section through the inner bending area so that the extrusion sections on both sides of the inner bending area are arranged opposite to each other;

[0019] Step S7: fixedly connecting the first adapter to the water inlet pipe section, and fixedly connecting the second adapter to the water outlet pipe section.

[0020] Compared with the prior art, the technical effects achieved by the embodiments of the present invention include:

[0021] The embodiment of the present invention extrude the traditional round tube into a flat tube, that is, a tube structure with a flat elliptical cross-section, and uses two elliptical structure parts as the windward side and the leeward side. Compared with the round tube under the same water flow conditions, it has a smaller windward area, reduces the possibility of smoke flow obstruction, and also makes the smoke flow on the leeward side smoother, reduces the possibility of large-scale vortex structure formation, which is beneficial to enhancing the heat exchange performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0023] In order to more clearly illustrate the embodiments of the present invention 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.

[0024] 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.

[0025] Figure 1 It is a three-dimensional structural diagram of a heat exchanger with non-contact thermal resistance fins according to the present invention;

[0026] Figure 2 This is a structural diagram of the base tube and the heat exchange fins of the present invention after bending;

[0027] Figure 3 This is a structural diagram of the base tube of the present invention before bending;

[0028] Figure 4 This is a structural diagram of the base tube and the heat exchange fins of the present invention before bending;

[0029] Figure 5-9 It is a structural diagram of the heat exchange fin in different embodiments;

[0030] Fig.10 The present invention is a flow chart of the processing technology of the heat exchanger with non-contact thermal resistance fins.

[0031] Reference numerals

[0032] 1. Base pipe; 2. Heat exchange fins; 3. First adapter; 4. Second adapter; 6. Water inlet section; 7. Water outlet section; 8. Processing section; 9. Extrusion section; 10. Bending section; 11. Extrusion area; 12. Inner bending area; 13. Fin opening area; 14. Water inlet; 15. First connecting section; 16. Water outlet; 17. Second connecting section. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Similar component numbers in the drawings represent similar components. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0035] It should also be understood that the terms used in this description of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the description of the embodiments of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms.

[0036] See also Figure 1-4 The present invention provides a heat exchanger with non-contact thermal resistance fins, which is used for high-temperature flue gas to achieve convective heat exchange and radiation heat exchange with the liquid inside through the outer surface, including a base tube 1, a heat exchange fin 2, a first adapter 3 and a second adapter 4, which are in a round tube structure before processing, and the non-end parts of the base tube 1 in a round tube are extruded and bent to form a C-shaped or S-shaped flat tube structure, the heat exchange fin 2 is integrally opened on the base tube 1, and the first adapter 3 and the second adapter 4 are connected to the two ends of the base tube 1. By extruding the middle part of the base tube 1 in a round tube structure into a flat tube, compared with the round tube structure, it has a smaller windward surface, which is conducive to the circulation of flue gas, reduces the possibility of forming a large-scale vortex structure, and is conducive to enhancing the heat exchange performance.

[0037] In the present invention, a surface protrusion structure (not shown) is further provided inside the base tube 1. The provision of this structure increases the contact area between the inner surface of the base tube 1 and the liquid, so that the heat of the base tube 1 can be transferred to the liquid flowing therein more quickly, and the heat transfer efficiency is higher. As a specific embodiment, the surface protrusion structure can be a protrusion structure welded on the inner side of the tube mouth.

[0038] See also Figure 2-4 The base pipe 1 includes an inlet pipe section 6 and an outlet pipe section 7 at both ends and a processing section 8 therebetween. The processing section 8, the inlet pipe section 6 and the outlet pipe section 7 are in contact with each other and are of an integrally formed design. The processing section 8 also includes an extrusion section 9 and a bending section 10. The extrusion sections 9 are provided with at least two groups and are arranged at intervals. The bending section 10 is arranged between the extrusion sections 9. The extrusion sections 9 are in contact with the bending sections 10 and are of an integrally formed design. The external extrusion mechanism extrudes the cross section of the extrusion section 9 into a flat elliptical shape by extruding the two ends of the extrusion section 9. Compared with a circular tube under the same liquid flow rate, the extrusion section 9 has a smaller windward area, and the leeward side flows more smoothly, which is conducive to enhancing the heat exchange performance.

[0039] An extrusion area 11 is provided on the bending section 10, and the extrusion area 11 is perpendicular to the extrusion surface of the extrusion section 9. The external extrusion mechanism deforms the bending section part by extruding the extrusion area 11. The setting of the extrusion area 11 makes the structural strength of the bending section 10 in the direction where the extrusion section 9 is extruded higher, providing structural guarantee for subsequent smooth bending, and reducing the possibility of structural damage at this location after bending due to low structural strength. It can be understood that the degree of squeezing of the squeezing area 11 is weaker than that of the squeezing section 9. The squeezing of the squeezing area 11 is for the consideration of strengthening the structure of the bending section 10, and the squeezing of the squeezing section 9 is for squeezing the base pipe 1 with a circular cross section into a flat elliptical shape to reduce the windward area; an inner bending area 12 is provided on each bending section 10, and the inner bending area 12 is arranged perpendicular to the squeezing area 11, and the adjacent inner bending areas 12 are staggered at both ends of the bending section 10. The external bending mechanism bends the bending section 10 through the inner bending area 12 so that the squeezing sections 9 on both sides of the inner bending area 12 are arranged relatively, wherein at least one bending section 10 is provided, so that the base pipe 1 has a relatively stable C-shaped structure as a whole when there is one bending section 10, or has a more stable S-shaped structure as a whole when there are more than two bending sections 10. In the present invention, the bending sections 10 are set to 3, including but not limited to this, and can be selected according to the actual bending requirements.

[0040] Please continue reading Figure 3 The two ends of the extruded section 9 are provided with fin opening areas 13. After the extruded section 9 is extruded, the fin opening areas 13 are in a planar structure. A plurality of groups of heat exchange fins 2 are opened on the extruded section 9 corresponding to the fin opening areas 13 by means of the fin cutting and toothing process. The heat exchange fins 2 and the base tube 1 constitute a high-strength flat tube heat exchange tube as a whole. The fin opening areas 13 in a planar structure also provide greater convenience for opening the heat exchange fins 2 by using the process. The heat exchange fins 2 are opened in an integrated manner, and the structural stability is better, and no welding is required. There is no contact thermal resistance between the heat exchanger and the base tube 1, which is beneficial to increasing the heat exchange performance of the heat exchanger, and the mechanized operation efficiency is higher. At the same time, it also avoids the safety hazards and the possibility of low efficiency caused by manual welding. Compared with the welded heat exchange fins 2 with the same heat dissipation performance, the structure can be made smaller, which is beneficial to the miniaturized design of the product. Please refer to Figure 5-9 The heat exchange fin 2 of the present invention is generally in a regular corrugated shape, an irregular corrugated shape, an intermittent corrugated shape, a zigzag shape or a straight line shape, which is conducive to contact and heat exchange with high-temperature flue gas, including but not limited to this, and other shapes and structures that are conducive to heat exchange can also be selected. Among them, the extrusion area 11 is arranged perpendicular to the fin opening area 13 of the extrusion section 9.

[0041] Please continue reading Figure 2The water inlet pipe section 6 includes a water inlet 14 and a first connecting section 15, and the two ends of the first connecting section 15 are respectively connected to the extrusion section 9 of the processing section 8 and the water inlet 14 in an integral manner; the water outlet pipe section 7 includes a water outlet 16 and a second connecting section 17, and the two ends of the second connecting section 17 are respectively connected to the extrusion section 9 of the processing section 8 and the water outlet 16 in an integral manner. It can be understood that there is a section of structure between the extrusion section 9 and the water inlet 14 and the water outlet 16, namely the first connecting section 15 and the second connecting section 17. The structural setting of the first connecting section 15 and the second connecting section 17 is equivalent to setting an isolation buffer zone, so that when the extrusion section 9 is extruded, the water inlet 14 and the water outlet 16 will not be directly deformed due to the deformation of the extrusion section 9, avoiding the possibility that the water inlet 14 and the water outlet 16 cannot be connected to the first adapter 3 and the second adapter 4 due to the deformation, which is conducive to improving the product yield. The specific length design of the first connecting section 15 and the second connecting section 17 can be determined according to the size and material of the actual extrusion section 9. Among them, the first adapter 3 is fixedly and sealedly connected to the water inlet 14, and the second adapter 4 is fixedly and sealedly connected to the water outlet 16, which can be achieved specifically by welding.

[0042] See also Fig.10 The present invention also provides a process for processing a heat exchanger with contact-free thermal resistance fins, comprising the following steps:

[0043] Step S1: providing a base tube in a round tube structure;

[0044] Step S2: Extruding the extruded section on the base pipe so that the cross section of the extruded section is a flat ellipse.

[0045] Before processing, the base pipe is in a round tube structure. After processing, the middle part of the base pipe is in a flat tube structure. Compared with the previous round tube structure, it has a smaller windward area, which is beneficial to improving the smoothness of flue gas flow.

[0046] Step S3: Arrange a plurality of surface protrusion structures in the base tube.

[0047] The arrangement of this structure increases the contact area with the liquid in the tube, so that the heat exchanged at the base tube can be transferred to the liquid in the tube more quickly.

[0048] Step S4: The bending section is extruded through the extrusion zone, so that the bending section is partially deformed.

[0049] It can be understood that the degree of extrusion of the extrusion zone on the extrusion zone is weaker than the degree of extrusion of the extrusion section, and the extrusion of the extrusion zone is for the consideration of strengthening the structure of the bending section.

[0050] Step S5: multiple groups of heat exchange fins are provided on the extrusion section.

[0051] Specifically, the process of cutting and scraping the fin teeth is adopted to open up an integrated structure, which does not require welding and has no contact thermal resistance, thus helping to increase the heat transfer performance of the heat exchanger.

[0052] Step S6: bend the bending section through the inner bending area so that the extrusion sections on both sides of the inner bending area are arranged opposite to each other.

[0053] That is, the base tube is bent through the inner bending zone to make it into a C-shaped or S-shaped structure as a whole, and the structural stability is better; by performing step S5 first and then performing step S6, it is helpful to avoid the problem of difficulty in heat exchange fins after bending the base tube.

[0054] Step S7: fixedly connecting the first adapter to the water inlet pipe section, and fixedly connecting the second adapter to the water outlet pipe section.

[0055] After the above process steps, the processing of the heat exchanger with non-contact thermal resistance fins is completed.

[0056] Compared with the prior art, the technical effects achieved by the embodiments of the present invention include:

[0057] The embodiment of the present invention extrude the traditional round tube into a flat tube, that is, a tube structure with a flat elliptical cross-section, and uses two elliptical structure parts as the windward side and the leeward side. Compared with the round tube under the same water flow conditions, it has a smaller windward area, reduces the possibility of smoke flow obstruction, and also makes the smoke flow on the leeward side smoother, reduces the possibility of large-scale vortex structure formation, which is beneficial to enhancing the heat exchange performance.

[0058] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0060] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0061] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0062] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0063] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0065] The above is a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A high-strength flat tube heat exchange tube, characterized in that: The invention comprises a base pipe, which is in a round pipe structure before processing. The base pipe comprises a water inlet pipe section and a water outlet pipe section at two ends and a processing section therebetween. Extrusion sections are arranged at intervals on the processing sections, and bending sections are arranged between the extrusion sections. At least one bending section is arranged, and the extrusion sections are in contact with the bending sections. An external extrusion mechanism extrudes the cross section of the extrusion sections into a flat ellipse by extruding the two ends of the extrusion sections. An extrusion area is arranged on the bending section, and the extrusion area is perpendicular to the extrusion surface of the extrusion section. The external extrusion mechanism deforms the bending section part by extruding the extrusion area, and the degree of extrusion on the extrusion area is weaker than that on the extrusion section. An inner bending area is arranged on each of the bending sections, and the inner bending area is arranged perpendicular to the extrusion area. The external bending mechanism bends the bending section through the inner bending area so that the extrusion sections on both sides of the inner bending area are arranged relatively.

2. The high-strength flat tube heat exchange tube according to claim 1, characterized in that: Adjacent inner bending areas are alternately arranged at both ends of the bending section.

3. The high-strength flat tube heat exchange tube according to claim 1, characterized in that: The two extruded ends of the extrusion section are arranged as fin opening areas, and a plurality of groups of heat exchange fins are opened on the extrusion section corresponding to the fin opening area by means of a fin cutting and tooth-scraping process.

4. The high-strength flat tube heat exchange tube according to claim 1, characterized in that: The water inlet pipe section includes a water inlet and a first connecting section, and two ends of the first connecting section are respectively connected to the processing section and the water inlet.

5. The high-strength flat tube heat exchange tube according to claim 1, characterized in that: The water outlet pipe section comprises a water outlet and a second connecting section, and two ends of the second connecting section are respectively connected to the processing section and the water outlet.

6. A heat exchanger with non-contact thermal resistance fins, characterized in that: It comprises the high-strength flat tube heat exchange tube as described in any one of claims 1 to 5, and also comprises a first adapter and a second adapter, wherein the first adapter is fixedly connected to the water inlet pipe section, and the second adapter is fixedly connected to the water outlet pipe section.

7. The heat exchanger with non-contact thermal resistance fins according to claim 6, characterized in that: A surface protrusion structure is arranged in the base tube.

8. A process for manufacturing a heat exchanger with non-contact thermal resistance fins as claimed in claim 7, characterized in that: The steps include: Step S1: providing a base tube in a round tube structure; Step S2: extruding the extruded section on the base pipe so that the cross section of the extruded section is a flat ellipse; Step S3: Arranging a plurality of surface protrusion structures in the base tube; Step S4: Extruding the bending section through the extrusion area so that the bending section is partially deformed; Step S5: providing a plurality of groups of heat exchange fins on the extrusion section; Step S6: bending the bending section through the inner bending area so that the extrusion sections on both sides of the inner bending area are arranged opposite to each other; Step S7: fixedly connecting the first adapter to the water inlet pipe section, and fixedly connecting the second adapter to the water outlet pipe section.

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