Heat exchange tube and heat exchanger
By designing a low-density connection between the first and second fin sections in the EGR cooler, the fin tip temperature is reduced, solving the problems of fin cracking and detachment, and improving the service life of the heat exchanger.
Patent Information
- Application Number
- CN202422833367.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-11-19
AI Technical Summary
The fin ends of the existing EGR cooler close to the air intake end have a high temperature and are prone to cracking and falling off.
Design a heat exchange tube that connects a first fin section and a second fin section. The density of the first fin section is lower than that of the second fin section, and the length and tooth pitch of the first fin section are within a specific range. The material and thickness of the first fin section are more resistant to high temperatures, so as to reduce the temperature at the fin tip.
It effectively avoids or reduces cracking and detachment of the fin tips during use, and improves the thermal fatigue life of the heat exchange tube.
Smart Images
Figure CN223460881U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to heat exchange equipment technical field, specifically, relate to a kind of heat exchange tube and heat exchanger. BACKGROUND
[0002] The exhaust temperature of engine gradually increases, especially gas engine, exhaust temperature can reach 700°C or more. EGR (is the abbreviation of Exhaust Gas Re-circulation, namely the abbreviation of exhaust gas recirculation) cooler generally takes gas from exhaust pipe, so the intake temperature of cooler is close to the exhaust temperature of engine. With the upgrading of emission regulations, EGR rate also shows an upward trend, which leads to the increase of heat load of EGR cooler and easily causes high temperature fatigue failure of cooler.
[0003] In order to meet the heat exchange power of cooler, the conventional EGR cooler adopts high-performance tube-fin structure, that is, the cooling unit of cooler is cooling tube+fin structure, and in order to ensure high heat exchange efficiency, the fin density is selected to be high, for example, the pitch is generally not more than 4mm.
[0004] Due to contact with a large amount of high-temperature EGR gas, the connection plate, cooling tube and fin of the intake end of the cooler have high service temperature, and since they are not in direct contact with the antifreeze, the fin in the cooling tube has the highest temperature, which is prone to cracking and falling off in use. UTILITY MODEL CONTENT
[0005] The utility model aims to provide a kind of heat exchange tube and heat exchanger, to solve the technical problems that the fin end portion near the intake end in prior art has high temperature and is prone to cracking and falling off in use to some extent.
[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:
[0007] A heat exchange tube, comprising a tube body and a heat exchange fin located in the tube body, the heat exchange fin is fixedly connected with the inner wall of the tube body;
[0008] The heat exchange fin comprises a first fin portion and a second fin portion; along the extension direction of the tube body, the first fin portion is connected at one end or both ends of the second fin portion;
[0009] The density of the first fin portion is lower than that of the second fin portion.
[0010] The optional technical scheme of the utility model is that the length of the first fin portion is less than that of the second fin portion, and the pitch of the first fin portion is 1-2.5 times of that of the second fin portion.
[0011] The first fin part has a tooth pitch of 3.6mm-9mm; and the second fin part has a tooth pitch of 1.8mm-4.5mm.
[0012] The first fin part has a tooth pitch of 3.6mm-9mm; and the second fin part has a tooth pitch of 1.8mm-4.5mm.
[0013] The second fin part has one or more of a wave structure, a staggered tooth structure, a louver structure and a straight structure.
[0014] The first fin part has a tooth pitch of 3.6mm-9mm; and the second fin part has a tooth pitch of 1.8mm-4.5mm.
[0015] The first fin part has a tooth pitch of 3.6mm-9mm; and the second fin part has a tooth pitch of 1.8mm-4.5mm.
[0016] The first fin part has a tooth pitch of 3.6mm-9mm; and the second fin part has a tooth pitch of 1.8mm-4.5mm.
[0017] The first fin part has a tooth pitch of 3.6mm-9mm; and the second fin part has a tooth pitch of 1.8mm-4.5mm.
[0018] The first fin part has a tooth pitch of 3.6mm-9mm; and the second fin part has a tooth pitch of 1.8mm-4.5mm.
[0019] The first fin part has a tooth pitch of 3.6mm-9mm; and the second fin part has a tooth pitch of 1.8mm-4.5mm.
[0020] The first fin part has a tooth pitch of 3.6mm-9mm; and the second fin part has a tooth pitch of 1.8mm-4.5mm.
[0021] The first fin part has a tooth pitch of 3.6mm-9mm; and the second fin part has a tooth pitch of 1.8mm-4.5mm.
[0022] A heat exchanger comprises a heat exchange pipe.
[0023] The heat exchanger further comprises a heat medium inlet end and a heat medium outlet end.
[0024] The heat medium inlet end and the heat medium outlet end are communicated through the heat exchange pipe, and the second fin part is provided with the first fin part at least at one end close to the heat medium inlet end.
[0025] The above technical scheme has the following beneficial effects:
[0026] The heat exchange pipe and the heat exchanger provided by the utility model have the first fin part connected at one end or both ends of the second fin part, and the density of the first fin part is lower than that of the second fin part, so that the heat exchange efficiency of the first fin part is reduced, and the temperature of the heat medium obtained by the first fin part is greatly reduced, thereby effectively avoiding or reducing the cracking and falling of the first fin part in the use process, that is, effectively avoiding or reducing the cracking and falling of the end part of the heat exchange fin in the use process.
[0027] In order to make the above objectives, characteristics and advantages of the present application more apparent, clear and easy to understand, the following preferred embodiments are specifically described below, and the accompanying drawings are referred to for a detailed description. BRIEF DESCRIPTION OF DRAWINGS
[0028] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of the drawings.
[0029] Figure 1 The structural schematic diagram of the heat exchanger provided by the embodiments of the utility model is shown in the figure.
[0030] Figure 2 The structural schematic diagram of the heat exchanger provided by the embodiments of the utility model is shown in the figure. Figure 1 The enlarged view of the A area of the heat exchanger shown in the figure.
[0031] Figure 3 The structural schematic diagram of the heat exchange pipe provided by the embodiments of the utility model is shown in the figure.
[0032] Figure 4 Another structural schematic diagram of the heat exchange pipe provided by the embodiments of the utility model is shown in the figure.
[0033] Figure legend: 100-heat medium inlet end; 200-heat medium outlet end; 300-tube body; 400-heat exchange fin; 410-first fin part; 420-second fin part. DETAILED DESCRIPTION
[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model more clear, the following will combine the drawings in the embodiments of the utility model to clearly and completely describe the technical scheme in the embodiments of the utility model, and obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0035] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but merely represents the selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.
[0036] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.
[0037] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships commonly placed when the product of the present application is used, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", etc. are only used for differentiation in description and cannot be understood as indicating or implying relative importance.
[0038] In addition, the terms "horizontal", "vertical", "overhanging", etc. do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.
[0039] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0040] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.
[0041] Embodiments
[0042] The present embodiment provides a heat exchange tube and a heat exchanger; please refer to Figures 1-4 , Figure 1A structural schematic diagram of a heat exchanger provided for the embodiment is shown in Figure 2 A structural schematic diagram of a heat exchanger provided for the embodiment is shown in Figure 1 An enlarged view of an A area of the heat exchanger shown in Figure 3 An enlarged view of an A area of the heat exchanger shown in Figure 4 Two structural schematic diagrams of a heat exchange tube provided for the embodiment are shown in
[0043] The heat exchange tube provided by the embodiment is used for a heat exchanger and a cooler, and is especially used for a heat exchanger and a cooler with a high temperature heat medium, such as an EGR cooler. Optionally, the heat exchange tube described in the embodiment is a high-temperature-resistant heat exchange tube.
[0044] Referring to Figures 1-4 As shown in the figure, the heat exchange tube comprises a tube body 300 and a heat exchange fin 400 fixedly connected with the inner wall of the tube body 300; the heat exchange fin 400 is located inside the tube body 300.
[0045] The heat exchange fin 400 comprises a first fin part 410 and a second fin part 420; along the extension direction of the tube body 300, the first fin part 410 is connected at one end or both ends of the second fin part 420. Optionally, the first fin part 410 and the second fin part 420 are an integral structure, or the first fin part 410 and the second fin part 420 are a split structure and are fixedly connected through welding, or the first fin part 410 and the second fin part 420 abut. Optionally, the first fin part 410 is connected at one end of the second fin part 420, and the first fin part 410 is close to the heat medium inlet end 100, so as to effectively reduce the temperature of the first fin part 410 to obtain the heat medium, thereby effectively avoiding or reducing the cracking and falling off of the first fin part 410 in the use process, that is, effectively avoiding or reducing the cracking and falling off of the end part of the heat exchange fin 400 in the use process. Optionally, the first fin part 410 is connected at both ends of the second fin part 420; the end part of the heat exchange fin 400 is generally the position with the highest or lowest temperature of the heat exchange fin 400, and by connecting the first fin part 410 at both ends of the second fin part 420, the heat exchange capacity of the first fin part 410 is effectively reduced, thereby effectively avoiding or reducing the cracking and falling off of the first fin part 410 in the use process due to high temperature or low temperature, that is, effectively avoiding or reducing the cracking and falling off of the end part of the heat exchange fin 400 in the use process.
[0046] The density of the first fin part 410 is lower than that of the second fin part 420; by setting different densities for the first fin part 410 and the second fin part 420, the first fin part 410 can have a lower heat exchange capacity, and the second fin part 420 can have a higher heat exchange capacity, thereby avoiding or reducing the cracking and falling off of the end part of the heat exchange fin 400 in the use process while ensuring the heat exchange performance of the heat exchange fin 400.
[0047] Optionally, the length of the first fin portion 410 is less than the length of the second fin portion 420 along the extending direction of the tube body 300. By the length of the first fin portion 410 being less than the length of the second fin portion 420, the overall heat exchange performance of the heat exchange fin 400 is guaranteed.
[0048] In the heat exchange tube described in the embodiment, the first fin portion 410 is connected to one end or both ends of the second fin portion 420, and the density of the first fin portion 410 is lower than the density of the second fin portion 420, so as to reduce the heat exchange efficiency of the first fin portion 410, and further greatly reduce the temperature of the heat medium obtained by the first fin portion 410, thereby effectively avoiding or reducing the cracking and falling off of the first fin portion 410 in the use process, that is, effectively avoiding or reducing the cracking and falling off of the end portion of the heat exchange fin 400 in the use process.
[0049] In the optional scheme of the embodiment, the pitch of the first fin portion 410 is 1-2.5 times the pitch of the second fin portion 420. For example, the pitch of the first fin portion 410 is 1 times, 1.2 times, 1.5 times, 1.8 times, 2 times or 2.5 times the pitch of the second fin portion 420, or other multiples. By the pitch of the first fin portion 410 being 1-2.5 times the pitch of the second fin portion 420, the first fin portion 410 can have a lower heat exchange capacity, and the second fin portion 420 can have a higher heat exchange capacity, so as to avoid or reduce the cracking and falling off of the end portion of the heat exchange fin 400 in the use process while guaranteeing the heat exchange performance of the heat exchange fin 400. Optionally, the pitch of the first fin portion 410 is 1-2 times the pitch of the second fin portion 420.
[0050] In the optional scheme of the embodiment, the pitch of the first fin portion 410 is 3.6-9 mm; optionally, the pitch of the first fin portion 410 is 4-8 mm; for example, the pitch of the first fin portion 410 is 4 mm, 5 mm, 5.5 mm, 6 mm, 6.2 mm, 7 mm or 8 mm, or other values. By the pitch of the first fin portion 410 being 4-8 mm, the heat exchange capacity of the first fin portion 410 is reduced, and the cracking and falling off of the end portion of the heat exchange fin 400 in the use process is avoided or reduced.
[0051] Optionally, the second fin portion 420 has a tooth pitch of 1.8mm-4.5mm. Optionally, the second fin portion 420 has a tooth pitch of 2mm-4mm. For example, the second fin portion 420 has a tooth pitch of 2mm, 2.5mm, 3mm, 3.2mm, 3.8mm or 4mm, or other values. By having the tooth pitch of the second fin portion 420 of 2mm-4mm, the second fin portion 420 has a higher heat exchange capacity, so as to ensure the heat exchange performance of the heat exchange fin 400.
[0052] Referring to Figures 1-4 In an optional embodiment of the present embodiment, the first fin portion 410 has a flat structure. By having the first fin portion 410 in a flat structure, the heat exchange efficiency of the first fin portion 410 is reduced, so as to avoid or reduce the cracking or falling off of the end portion of the heat exchange fin 400 during use. In the present embodiment, the first fin portion 410 can also have a wave structure or other structures. For example, the first fin portion 410 can have a relatively sparse wave structure.
[0053] Optionally, the second fin portion 420 has one or more of a wave structure, a staggered tooth structure, a louver structure and a flat structure. The second fin portion 420 can also have other structures.
[0054] Optionally, the second fin portion 420 has a wave structure, a staggered tooth structure or a louver structure.
[0055] In order to more effectively improve the high temperature resistance of the first fin portion 410, the thickness of the first fin portion 410 can be increased, so as to avoid or reduce the cracking or falling off of the first fin portion 410 during use, i.e. to effectively avoid or reduce the cracking or falling off of the end portion of the heat exchange fin 400 during use. In an optional embodiment of the present embodiment, the thickness of the first fin portion 410 is greater than or equal to the thickness of the second fin portion 420. The thickness of the first fin portion 410 and the thickness of the second fin portion 420 refer to the thickness of the material used by the first fin portion 410 and the second fin portion 420.
[0056] In an optional embodiment of the present embodiment, the thickness of the first fin portion 410 is 0.18mm-0.55mm. Optionally, the thickness of the first fin portion 410 is 0.2mm-0.5mm. For example, the thickness of the first fin portion 410 is 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm or 0.5mm, or other values. By having the thickness of the first fin portion 410 of 0.2mm-0.5mm, the high temperature resistance of the first fin portion 410 is effectively improved, so as to avoid or reduce the cracking or falling off of the end portion of the heat exchange fin 400 during use.
[0057] In an optional solution of the embodiment, the length of the first fin part 410 is 10-100 mm; for example, the length of the first fin part 410 is 10 mm, 30 mm, 50 mm, 65 mm, 85 mm or 100 mm, or other values. By setting the length of the first fin part 410 to 10-100 mm, the influence of the first fin part 410 on the overall heat exchange performance of the heat exchange fin 400 is reduced, so as to ensure the overall heat exchange performance of the heat exchange fin 400.
[0058] In order to more effectively improve the high-temperature resistance of the first fin part 410, the first fin part 410 is made of a material that is more resistant to high temperature. In an optional solution of the embodiment, the high-temperature resistance of the first fin part 410 is higher than that of the second fin part 420, so as to effectively improve the high-temperature resistance of the first fin part 410, thereby reducing the cracking and falling off of the end part of the heat exchange fin 400 during use.
[0059] In an optional solution of the embodiment, the material of the first fin part 410 is stainless steel or other similar materials, for example, the material of the first fin part 410 is ferritic stainless steel or super austenitic stainless steel, or other similar materials; so as to effectively improve the high-temperature resistance of the first fin part 410, thereby reducing the cracking and falling off of the end part of the heat exchange fin 400 during use.
[0060] Optionally, the material of the first fin part 410 is 444 ferritic stainless steel (i.e., 00Cr18Mo2).
[0061] Optionally, the material of the second fin part 420 is stainless steel or other similar materials, for example, the material of the second fin part 420 is austenitic stainless steel. Since the second fin part 420 contacts the exhaust gas, it needs a certain corrosion resistance, and the austenitic stainless steel has excellent corrosion resistance.
[0062] Optionally, the material of the second fin part 420 is 316L austenitic stainless steel.
[0063] Optionally, the material of the tube body 300 is austenitic stainless steel or other similar materials. The tube body 300 also contacts the exhaust gas and needs a certain corrosion resistance, and the austenitic stainless steel has excellent corrosion resistance.
[0064] In an optional solution of the embodiment, the first fin part 410 has a pitch of 4mm-8mm, and the length of the first fin part 410 is 10mm-100mm, and the second fin part 420 has a pitch of 2mm-4mm, which can greatly reduce the temperature of the first fin part 410 obtained from the heat medium, that is, reduce the end temperature of the heat exchange fin 400 at the first fin part 410, which can be understood as greatly reducing the end temperature of the heat exchange tube at the first fin part 410, thereby reducing the temperature of the main plate connected with the first fin part 410 and the heat exchange tube, for example, the temperature of the main plate can be reduced by more than 100℃, effectively reducing the thermal stress value of the main plate, and the thermal fatigue life of the heat exchange tube can be increased by more than 1 times.
[0065] In an optional solution of the embodiment, the first fin part 410 is made of 444 ferrite stainless steel, and the thickness of the first fin part 410 is 0.2mm-0.5mm, which can effectively improve the strength of the first fin part 410, for example, the strength of the first fin part 410 can be increased by more than 3 times.
[0066] In an optional solution of the embodiment, the second fin part 420 is made of 316L austenitic stainless steel, and the thickness of the second fin part 420 is allowed to be less than or equal to 0.2mm, which can not only reduce the cost of the heat exchange tube, but also make the second fin part 420 have excellent corrosion resistance.
[0067] Referring to FIGS. 1-4, Figure 1 and Figure 2 The heat exchanger also includes the heat exchange tube according to any one of the above embodiments.
[0068] The heat exchanger has the first fin part 410 connected to one end or both ends of the second fin part 420, and the density of the first fin part 410 is lower than that of the second fin part 420, so as to reduce the heat exchange efficiency of the first fin part 410, thereby greatly reducing the temperature of the heat medium obtained by the first fin part 410, and effectively avoiding or reducing the cracking and falling off of the first fin part 410 in use, that is, effectively avoiding or reducing the cracking and falling off of the end of the heat exchange fin 400 in use.
[0069] The heat exchanger provided in the embodiment includes the heat exchange tube described above, and the technical features of the heat exchange tube disclosed above also apply to the heat exchanger. The technical features of the heat exchange tube disclosed above are not described again. The heat exchanger described in the embodiment has the advantages of the heat exchange tube described above, and the advantages of the heat exchange tube disclosed above are not described again.
[0070] Referring to FIGS. 1-4, Figure 1 and Figure 2As shown, in the optional solution of the embodiment, the heat exchanger further comprises a heat medium inlet end 100 and a heat medium outlet end 200;
[0071] The heat medium inlet end 100 and the heat medium outlet end 200 are communicated through the heat exchange pipe, and the second fin part 420 is provided with the first fin part 410 at least at one end close to the heat medium inlet end 100. By providing the first fin part 410 at least at one end close to the heat medium inlet end 100, the temperature of the heat medium obtained by the first fin part 410 is effectively reduced, thereby effectively avoiding or reducing the cracking and falling off of the first fin part 410 in the use process, that is, effectively avoiding or reducing the cracking and falling off of the end of the heat exchange fin 400 in the use process.
[0072] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A heat exchange tube, characterized by, The heat exchange tube comprises a tube body and heat exchange fins arranged in the tube body, and the heat exchange fins are fixedly connected with the inner wall of the tube body; The heat exchange fins comprise first fin portions and second fin portions; along the extension direction of the tube body, the first fin portions are connected at one end or both ends of the second fin portions; The density of the first fin portions is lower than that of the second fin portions.
2. The heat exchange tube according to claim 1, wherein The length of the first fin portions is shorter than that of the second fin portions, and the pitch of the first fin portions is 1-2.5 times of the pitch of the second fin portions.
3. The heat exchange tube according to claim 1, wherein The pitch of the first fin portions is 3.6-9 mm, and the pitch of the second fin portions is 1.8-4.5 mm.
4. The heat exchange tube of claim 1, wherein The first fin portions adopt flat or wavy structures; The second fin portions adopt one or more of wavy, staggered, louver and flat structures.
5. The heat exchange tube of claim 1, wherein The thickness of the first fin portions is greater than or equal to that of the second fin portions.
6. The heat exchange tube according to claim 3 or 5, characterized in that The thickness of the first fin portions is 0.18-0.55 mm. The pitch of the first fin portions is 4, 5, 6, 7 or 8 mm. The pitch of the second fin portions is 2, 3 or 4 mm.
7. The heat exchange tube of claim 1, wherein The length of the first fin portions is 10-100 mm.
8. The heat exchange tube of claim 1, wherein The material of the first fin portions is stainless steel, and the material of the second fin portions is stainless steel.
9. A heat exchanger, characterized by The heat exchange tube comprises the heat exchange tube according to any one of claims 1-8.
10. The heat exchanger of claim 9, wherein, The heat exchange tube further comprises a heat medium inlet end and a heat medium outlet end; The heat medium inlet end and the heat medium outlet end are communicated through the heat exchange tube, and the second fin portions are provided with the first fin portions at least at one end close to the heat medium inlet end.