Efficient heat exchanger
By setting fins and small holes on the heat transfer tubes and combining them with baffle design, the problem of poor heat transfer performance of existing heat exchangers is solved, achieving a high-efficiency and compact heat exchanger design, reducing equipment space and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FOSHAN RUIJIA MASCH EQUIP CO LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-05-19
AI Technical Summary
Existing heat exchangers, which extend the fluid residence time using baffles, still cannot achieve efficient heat transfer, and the heat transfer effect is limited.
Fins are installed on the heat transfer tubes and small pits are set on the fins. The fins are attached to the inner wall of the shell to form a drum shape, which increases the heat exchange area per unit length. The heat transfer tubes and fins are tightly connected by interference fit, and baffles are combined to extend the flow path of the fluid in the heat exchanger.
It achieves a compact size and high heat transfer efficiency, reducing the size and cost of the heat exchanger and improving heat transfer efficiency.
Smart Images
Figure CN224262286U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat exchanger technology, and in particular to a high-efficiency heat exchanger. Background Technology
[0002] A heat exchanger is an energy-saving device that facilitates heat transfer between two or more fluids at different temperatures. It transfers heat from a higher-temperature fluid to a lower-temperature fluid, bringing the fluid temperature to the specified parameters to meet process requirements. It is also one of the key devices for improving energy efficiency. Heat exchangers are widely used in industrial production, energy engineering, ventilation and air conditioning systems, power engineering, chemical industry, petroleum, metallurgy, food processing, and many other fields. Common types of heat exchangers include:
[0003] Plate heat exchangers: They exchange heat through plates and have advantages such as high heat transfer efficiency and compact structure. They come in different forms, such as detachable and brazed types. Spiral plate heat exchangers: They have a high heat transfer coefficient and can meet the needs of different working conditions. Tube heat exchangers: For example, water-cooled tubular oil coolers use water as the cooling medium.
[0004] Patent CN222528399U discloses a high-efficiency heat exchanger. The main structural feature of this heat exchanger is the alternating arrangement of several baffles in the middle of the shell. Each baffle has a through-hole with the same diameter as the heat exchange tube, through which the heat exchange tube passes. The function of the baffles is to enhance convective heat transfer by increasing the turbulence of the hot water, thereby increasing the relative velocity and disturbance between the fluid and the heat exchange tube. This also increases the residence time of the fluid in the heat exchanger, allowing for more opportunities for heat transfer and thus improving heat exchange efficiency.
[0005] However, in practical applications, it has been found that relying solely on baffles to extend the residence time of fluid in a heat exchanger still yields limited heat transfer efficiency and cannot fully achieve the goal of highly efficient heat transfer. This indicates that there is still room for improvement in existing technologies. Utility Model Content
[0006] This invention overcomes the shortcomings of the prior art and provides a high-efficiency heat exchanger with the advantages of compact size and high heat transfer efficiency.
[0007] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:
[0008] A high-efficiency heat exchanger includes a shell, the shell forming a heat exchange chamber, and a heat transfer tube disposed in the heat exchange chamber; a first tube sheet is connected to the shell, a first end cap is connected to the first tube sheet, and the first end cap is provided with a cold fluid inlet and a cold fluid outlet, the cold fluid inlet being connected to the inlet of the heat transfer tube, and the outlet of the heat transfer tube being connected to the cold fluid outlet.
[0009] The shell is provided with a hot fluid inlet and a hot fluid outlet, and the hot fluid inlet, hot fluid outlet and heat exchange chamber are connected to each other; a number of fins are connected to the heat transfer tube, the fins are arranged parallel to each other, and a fluid channel is reserved between the edge of the fin and the inner wall of the shell; the fins are provided with through holes for assembly with the heat transfer tube, and the through holes and the heat transfer tube form an interference fit.
[0010] Furthermore, the fins have 4 to 6 small dots of φ3 mm to φ4 mm in the surrounding area where they contact the heat transfer tube.
[0011] Furthermore, the fins are configured in a drum shape, with both sides of the fins adhering to the inner wall of the shell, and the drum height of the fins being 70% to 80% of the inner diameter of the shell.
[0012] Furthermore, the diameter of the heat transfer tube is φ8 mm ~ φ12.7 mm, and the center distance of the heat transfer tube is 10 mm ~ 20 mm.
[0013] Furthermore, the heat exchange chamber is also provided with baffles arranged alternately on the upper and lower sides. The baffles are connected to the heat transfer tubes and their edges are in contact with the inner wall of the shell.
[0014] Furthermore, a partition plate is provided inside the first end cap to divide the interior of the first end cap into a first chamber that communicates with the cold fluid inlet and a second chamber that communicates with the cold fluid outlet.
[0015] Furthermore, a second tube sheet is connected to the other end of the housing, and a second end cap is connected to the second tube sheet. The second end cap encloses and forms a reflux zone.
[0016] Furthermore, the fin wall thickness is 0.2~0.3mm, and the spacing between adjacent fins is 1.4~1.8mm.
[0017] Compared with the prior art, the beneficial effects of this utility model are:
[0018] This high-efficiency heat exchanger has the advantages of compact size and high heat transfer efficiency. Due to the fins and small dotted areas on the fins, the heat exchange area per unit length is increased. Compared with traditional heat exchangers, under the same heat exchange requirements, the heat exchanger volume can be greatly reduced, saving equipment space and cost. Attached Figure Description
[0019] The accompanying drawings are provided to further illustrate the present invention and, together with the embodiments of the present invention, are used to explain the present invention. They do not constitute a limitation thereof. In the drawings:
[0020] Figure 1 This is an overall diagram of the first embodiment of the high-efficiency heat exchanger;
[0021] Figure 2 This is a schematic diagram of the first tube sheet and the first end cap in the first embodiment of the high-efficiency heat exchanger in a separated state;
[0022] Figure 3 This is a cross-sectional view of the first embodiment of the high-efficiency heat exchanger;
[0023] Figure 4 This is a schematic diagram of the first embodiment of the high-efficiency heat exchanger with the shell removed;
[0024] Figure 5 This is an overall diagram of the second embodiment of the high-efficiency heat exchanger;
[0025] Figure 6 This is an overall diagram of the third embodiment of the high-efficiency heat exchanger;
[0026] Figure 7 This is a schematic diagram of the second tube sheet and the second end cap separated in the third embodiment of the high-efficiency heat exchanger;
[0027] Figure 8 This is a cross-sectional view of the third embodiment of the high-efficiency heat exchanger.
[0028] In the picture:
[0029] 1. Shell; 101. Heat exchange chamber; 102. Hot fluid inlet; 103. Hot fluid outlet; 2. Heat transfer tube; 3. First tube sheet; 4. First end cap; 401. Cold fluid inlet; 402. Cold fluid outlet; 403. Divider plate; 404. First chamber; 405. Second chamber; 5. Fin; 501. Small cavity; 6. Baffle plate; 7. Second tube sheet; 8. Second end cap; 801. Reflux zone. Detailed Implementation
[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0031] like Figures 1 to 4 As shown, this utility model claims protection for a high-efficiency heat exchanger, which is a U-tube water-cooled heat exchanger, including a shell 1, a heat exchange chamber 101 formed in the shell 1, and a heat transfer tube 2 disposed in the heat exchange chamber 101; a first tube sheet 3 is connected to the shell 1, and a first end cap 4 is connected to the first tube sheet 3, the first end cap 4 is provided with a cold fluid inlet 401 and a cold fluid outlet 402, the cold fluid inlet 401 is connected to the inlet of the heat transfer tube 2, and the outlet of the heat transfer tube 2 is connected to the cold fluid outlet 402; specifically, the first tube sheet 3 is provided with holes corresponding to the heat transfer tube 2, and the heat transfer tube 2 is inserted into the corresponding holes and fixed on the first tube sheet 3 by expansion joint.
[0032] The shell 1 is provided with a hot fluid inlet 102 and a hot fluid outlet 103, and the hot fluid inlet 102, the hot fluid outlet 103 and the heat exchange chamber 101 are connected. The hot oil that needs to be cooled flows in from the hot fluid inlet 102, and after passing through the heat transfer pipe 2 which is filled with cold fluid, heat exchange occurs, and then flows out from the hot fluid outlet 103.
[0033] Specifically, baffles 6 are alternately arranged vertically in the heat exchange chamber 101. The baffles 6 are connected to the heat transfer tubes 2, and their edges are fitted against the inner wall of the shell 1. Figure 3 It can be seen that the baffle 6 will extend the flow path of hot oil in the heat exchange chamber 101, which helps to prolong the contact time with the heat transfer tube 2 and improve the cooling effect.
[0034] The main feature of this heat exchanger is that it... Figure 3 It can be seen that several fins 5 are connected to the heat transfer tube 2. The fins 5 are arranged parallel to each other, and a fluid channel is reserved between the edge of the fin 5 and the inner wall of the shell 1. The fluid channel and the gap between adjacent fins 5 are for the flow of hot oil. The fins 5 are provided with through holes for assembly with the heat transfer tube 2. The through holes and the heat transfer tube 2 form an interference fit, that is, the heat transfer tube 2 and the fins 5 are tightly stretched or pushed together. The interference fit can reach about 0.2 mm, which is conducive to the efficient transfer of heat.
[0035] Furthermore, in this embodiment, 4 to 6 small holes 501 with a diameter of 3 mm to 4 mm are provided on the fin 5 in the peripheral area where it contacts the heat transfer tube 2. This helps to create turbulence in the fluid passing through the surface of the fin 5, which is more conducive to heat transfer.
[0036] The fins 5 are set in a drum shape, with both sides of the fins 5 attached to the inner wall of the shell 1. The height of the fins 5 is 70% to 80% of the inner diameter of the shell 1. This design is conducive to the flow of high-temperature fluids and can also increase the heat transfer area.
[0037] In this embodiment, the heat transfer tubes 2 are arranged in a triangular and closely spaced manner. The diameter of the heat transfer tubes 2 is φ8 mm ~ φ12.7 mm, and the center distance of the heat transfer tubes 2 is 10 mm ~ 20 mm, which is conducive to the formation of turbulent flow and meets the requirements of various working conditions.
[0038] like Figure 2 as well as Figure 3As shown, a partition plate 403 is provided inside the first end cap 4 to divide the interior of the first end cap 4 into a first chamber 404 communicating with the cold fluid inlet 401 and a second chamber 405 communicating with the cold fluid outlet 402. In this embodiment, the heat transfer tube 2 is a U-shaped tube, that is, the inlet of the U-shaped tube is connected to the upper half of the first tube sheet 3 and communicates with the first chamber 404, and the outlet of the U-shaped tube is connected to the lower half of the first tube sheet 3 and communicates with the second chamber 405.
[0039] In this embodiment, the wall thickness of fin 5 is 0.2~0.3mm, which meets the requirements of various fluids and a wide range of flow rates; the spacing between adjacent fins 5 is 1.4~1.8mm, which only increases the heat exchange area per unit volume, while also taking into account low fluid resistance.
[0040] like Figure 5 The image shows another embodiment of this heat exchanger, which is an insertion type heat exchanger. High-temperature hot oil also flows from the hot fluid inlet 102 into the heat exchange chamber 101 in the shell 1, exchanges heat with the heat transfer tube 2, and is finally output from the hot fluid outlet 103. The internal gas structure is the same as that of the U-tube water-cooled heat exchanger.
[0041] like Figures 6 to 8 The diagram shows another embodiment of the heat exchanger, a fixed water-cooled heat exchanger. A second tube sheet 7 is connected to the other end of the shell 1, and a second end cap 8 is connected to the second tube sheet 7. The second end cap 8 encloses and forms a reflux zone 801. Its main difference from the U-tube water-cooled heat exchanger is that the heat transfer tubes 2 are divided into upper and lower groups, both of which are straight and parallel. The upper group of heat transfer tubes 2 is the input, and the lower group is the output. One end of each group of heat transfer tubes 2 is connected to the first tube sheet 3, and the other end is connected to the second tube sheet 7. The cold flow input from the upper heat transfer tubes 2 flows back to the lower heat transfer tubes 2 in the reflux zone 801 and is finally output.
[0042] This high-efficiency heat exchanger has the advantages of compact size and high heat transfer efficiency. Due to the presence of fins 5 and small dot 501 on the fins 5, the heat exchange area per unit length is increased. Compared with traditional heat exchangers, under the same heat exchange requirements, the heat exchanger volume can be greatly reduced, saving equipment space and cost.
[0043] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A high-efficiency heat exchanger, characterized in that: The device includes a shell (1), which forms a heat exchange chamber (101) and a heat transfer tube (2) is disposed in the heat exchange chamber (101); a first tube sheet (3) is connected to the shell (1), a first end cap (4) is connected to the first tube sheet (3), and a cold fluid inlet (401) and a cold fluid outlet (402) are disposed on the first end cap (4). The cold fluid inlet (401) is connected to the inlet of the heat transfer tube (2), and the outlet of the heat transfer tube (2) is connected to the cold fluid outlet (402). The shell (1) is provided with a hot fluid inlet (102) and a hot fluid outlet (103), and the hot fluid inlet (102), the hot fluid outlet (103) and the heat exchange chamber (101) are connected together; a number of fins (5) are connected to the heat transfer tube (2), and the number of fins (5) are arranged parallel to each other; the fins (5) are provided with through holes for assembly with the heat transfer tube (2), and the through holes and the heat transfer tube (2) form an interference fit.
2. The high-efficiency heat exchanger according to claim 1, characterized in that: The fin (5) has 4 to 6 small holes (501) of φ3 mm to φ4 mm in the peripheral area where it contacts the heat transfer tube (2).
3. The high-efficiency heat exchanger according to claim 1, characterized in that: The fins (5) are configured in a drum shape, with the two sides of the fins (5) attached to the inner wall of the shell (1), and the height of the fins (5) is 70% to 80% of the inner diameter of the shell (1).
4. The high-efficiency heat exchanger according to claim 1, characterized in that: The diameter of the heat transfer tube (2) is φ8 mm ~ φ12.7 mm, and the center distance of the heat transfer tube (2) is 10 mm ~ 20 mm.
5. The high-efficiency heat exchanger according to any one of claims 1 to 4, characterized in that: The heat exchange chamber (101) is also provided with baffles (6) arranged alternately on the top and bottom. The baffles (6) are connected to the heat transfer tube (2) and their edges are attached to the inner wall of the shell (1).
6. The high-efficiency heat exchanger according to claim 1, characterized in that: The first end cap (4) is provided with a partition plate (403) to divide the interior of the first end cap (4) into a first chamber (404) that communicates with the cold fluid inlet (401) and a second chamber (405) that communicates with the cold fluid outlet (402).
7. The high-efficiency heat exchanger according to claim 1, characterized in that: The other end of the housing (1) is connected to a second tube sheet (7), and a second end cap (8) is connected to the second tube sheet (7). The second end cap (8) encloses to form a reflux zone (801).
8. The high-efficiency heat exchanger according to claim 1, characterized in that: The fin (5) has a wall thickness of 0.2~0.3mm and a spacing of 1.4~1.8mm between adjacent fins (5).