Corrosion-resistant plate-type fin heat exchanger

Abstract

The utility model discloses a corrosion-resistant plate-type fin heat exchanger which has excellent corrosion resistance and pressure resistance and can ensure a good heat exchange effect. Comprising a protection plate set, a fin set and a heat exchange tube set, the protection plate set comprises an upper protection plate, a lower protection plate, a left fixing plate and a right fixing plate, the upper protection plate and the lower protection plate are fixedly installed between the left fixing plate and the right fixing plate, the fin set is parallel to the left fixing plate and the right fixing plate, and the fin set is arranged between the left fixing plate and the right fixing plate. The upper end of the fin set is fixedly connected with the upper protection plate, the lower protection plate is obliquely arranged relative to the upper protection plate, part of plate bodies of the left fixing plate and the right fixing plate are located below the lower protection plate, and the fin set comprises corrugated fins and flat fins which are alternately arranged. The heat exchange tube set comprises U-shaped heat exchange tubes arranged in the fin set in a penetrating mode and connecting bent tubes used for connecting every two adjacent U-shaped heat exchange tubes, and the U-shaped heat exchange tubes and the connecting bent tubes are fixedly connected through connecting sleeves.

Description

Technical Field

[0001] The utility model relates to the technical field of heat exchangers, in particular to a corrosion-resistant plate-type fin heat exchanger. Background Art

[0002] The application range of heat exchangers is very wide, and their structural forms are various. Since the industrial civilization, humans have invented and used dozens of heat exchangers with typical structures, such as shell and tube, sleeve and tube, plate (removable and non-removable), spiral plate, plate-fin (including tube-belt type, parallel flow type, cascade type and tube-belt type of automobile air conditioner), tube-sheet type, etc. The plate heat exchanger is a new type of high-efficiency heat exchanger composed of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat is exchanged through the plates. Cold and hot fluids pass alternately on both sides of the plate, and each plate is a heat transfer surface. The concave and convex corrugations pressed on the plate change the direction and cross-section of the flow channel many times, thereby increasing the turbulence of the fluid. The advantages of the plate heat exchanger are high heat exchange efficiency, low heat loss, compact and light structure, small footprint, easy installation and cleaning, wide application, and long service life. Under the same pressure loss condition, its heat transfer coefficient is 3-5 times higher than that of shell-and-tube heat exchangers, the floor space is one-third of that of tube heat exchangers, and the heat recovery rate can be as high as 90% or more, so it is widely used. In the fields of chemical industry, electric power, pharmaceuticals, etc., heat exchangers are an important equipment used to heat, cool or evaporate fluids. In view of the special working conditions that require corrosion resistance in the above fields, the inventors designed a corrosion-resistant plate-fin heat exchanger. Utility Model Content

[0003] The technical problem to be solved by the utility model is: to overcome the defects of the existing technical problems and provide a corrosion-resistant plate-type fin heat exchanger with excellent corrosion resistance and pressure resistance, and can ensure a good heat exchange effect.

[0004] In order to solve the above technical problems, the technical solution of the utility model is: a corrosion-resistant plate-type fin heat exchanger, comprising a guard plate group, a fin group and a heat exchange tube group, the guard plate group comprising an upper guard plate, a lower guard plate and left and right fixed plates, the upper guard plate and the lower guard plate are fixedly installed between the left and right fixed plates, the fin group is parallel to the left and right fixed plates and the fin group is arranged between the left and right fixed plates, the upper end of the fin group is fixedly connected to the upper guard plate, the lower guard plate is inclined relative to the upper guard plate and part of the plate body of the left and right fixed plates is located below the lower guard plate, the fin group comprises alternating corrugated fins and flat fins, the heat exchange tube group comprises a U-shaped heat exchange tube passing through the fin group and a connecting elbow for connecting two adjacent U-shaped heat exchange tubes, the U-shaped heat exchange tube and the connecting elbow are fixedly connected by a connecting sleeve.

[0005] Furthermore, the U-shaped heat exchange tube is passed through the fin group and fixed to the fin group by an expansion tube, and one end of the U-shaped heat exchange tube passes through the fin group and extends to the outside of the guard plate group.

[0006] Furthermore, the left and right fixing plates are provided with connection holes for the U-shaped heat exchange tubes to pass through, and the upper guard plate and the lower guard plate are provided with a plurality of drainage holes.

[0007] Furthermore, the inclination angle α of the lower guard plate is 1°-3°.

[0008] Furthermore, the flat fins and the corrugated fins are both formed by stamping aluminum alloy sheets.

[0009] Furthermore, the upper and lower surfaces of the flat fins and the corrugated fins are sprayed with corrosion-resistant coating, and the corrosion-resistant coating is a graphene polymer composite coating.

[0010] Furthermore, the flat fins and the corrugated fins are both provided with a plurality of through holes for the U-shaped heat exchange tubes to pass through.

[0011] Furthermore, an annular connecting plate is fixedly provided on the inner wall of the connecting sleeve by welding, and the width of the connecting plate corresponds to the wall thickness of the connecting elbow and the U-shaped heat exchange tube.

[0012] Furthermore, the inner wall of the connecting sleeve and both side surfaces of the connecting plate are coated with solder.

[0013] Furthermore, the inner diameter of the connecting sleeve corresponds to the outer diameter of the connecting elbow and the U-shaped heat exchange tube.

[0014] By adopting the above technical solution, the utility model has the following beneficial effects:

[0015] 1. Using aluminum alloy sheet as the raw material of the fin and spraying corrosion-resistant coating on its upper and lower surfaces can improve the corrosion resistance of the fin;

[0016] 2. The design of corrugated fins can increase the heat exchange surface area and improve the heat exchange efficiency. Since the corrugated fins and the flat fins are arranged alternately, there is enough gap between the corrugated fins and the flat fins to prevent the accumulation of corrosive media;

[0017] 3. The lower guard plate is tilted relative to the upper guard plate, which ensures that the condensed water can flow out smoothly while also avoiding the gap between the fin group and the lower guard plate being too large to affect the heat exchange effect;

[0018] 4. The U-shaped heat exchange tube and the connecting elbow are fixedly connected by a connecting sleeve, which avoids the cracking of the U-shaped heat exchange tube port caused by mechanical cold processing procedures such as "cup mouth" and "flare mouth" implemented in the existing heat exchanger manufacturing process, thereby improving the yield of the heat exchanger. The connection strength between the U-shaped heat exchange tube and the connecting elbow is high and the sealing performance is good, which further ensures the highest pressure resistance and optimal corrosion resistance of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the corrosion-resistant plate-type fin heat exchanger of the utility model;

[0020] Figure 2 for Figure 1 A magnified view of part A in FIG.

[0021] Figure 3 for Figure 1 A top view of

[0022] Figure 4 for Figure 3 Sectional view along BB;

[0023] Figure 5 for Figure 4 The enlarged view of the C part in FIG.

[0024] Figure 6 for Figure 4 Enlarged view of part D in .

[0025] Reference numerals: 1, guard plate group; 2, fin group; 3, heat exchange tube group;

[0026] 11. Upper guard plate; 12. Lower guard plate; 13. Left and right fixing plates; 14. Drain hole;

[0027] 21. Corrugated fins; 22. Flat fins;

[0028] 31. U-shaped heat exchange tube; 32. Connecting elbow; 33. Connecting sleeve; 34. Connecting plate. DETAILED DESCRIPTION

[0029] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0030] like Figure 1-6As shown, in this embodiment, a corrosion-resistant plate fin heat exchanger is provided, including a guard plate group 1, a fin group 2 and a heat exchange tube group 3, the fin group 2 is fixed in the guard plate group 1, the heat exchange tube group 3 includes a U-shaped heat exchange tube 31 and a connecting elbow 32, the U-shaped heat exchange tube 31 is passed through the fin group 2 and fixed to the fin group 2 by an expansion tube, and one end of the U-shaped heat exchange tube 31 passes through the fin group 2 and extends to the outside of the guard plate group 1, the connecting elbow 32 is used to connect two adjacent U-shaped heat exchange tubes 31 so that the adjacent U-shaped heat exchange tubes 31 are connected to each other, and the fin group 2 includes corrugated fins 21 and flat fins 22 that are alternately arranged.

[0031] like Figure 1-6 As shown, in this embodiment, the guard plate group 1 includes an upper guard plate 11, a lower guard plate 12 and left and right fixed plates 13. The upper guard plate 11 and the lower guard plate 12 are fixedly installed between the left and right fixed plates 13. The fin group 2 is parallel to the left and right fixed plates 13 and the fin group 2 is arranged between the left and right fixed plates 13. The upper end of the fin group 2 is fixedly connected to the upper guard plate 11. The left and right fixed plates 13 are provided with connecting holes for allowing the U-shaped heat exchange tube 31 to pass through. The upper guard plate 11 and the lower guard plate 12 are provided with a plurality of drainage holes 14. The lower guard plate 12 is inclined relative to the upper guard plate 11 to facilitate the outflow of condensed water condensed on the fins.

[0032] like Figure 1-6 As shown, in this embodiment, the inclination angle α of the lower guard plate 12 is 1°-3°, which ensures that the condensed water can flow out smoothly while also avoiding the gap between the fin group 2 and the lower guard plate 12 being too large to affect the heat exchange effect.

[0033] like Figure 1-6 As shown, in the present embodiment, part of the plate body of the left and right fixed plates 13 is located below the lower guard plate 12, so that the installation position of the lower guard plate 12 is raised relative to the lower end surface of the left and right fixed plates 13, so that a certain gap is left between the lower guard plate 12 and the ground, which is convenient for the discharge of condensed water and can prevent condensed water and corrosive media from accumulating on the lower guard plate 12 and damaging the lower guard plate 12.

[0034] like Figure 1-6 As shown, in this embodiment, the flat fins 22 and the corrugated fins 21 are both stamped from aluminum alloy sheets, and corrosion-resistant paint is sprayed on the left and right surfaces. At the same time, a plurality of through holes for the U-shaped heat exchange tubes 31 to pass through are opened on the flat fins 22 and the corrugated fins 21. The design of the corrugated fins 21 can increase the heat exchange surface area and improve the heat exchange efficiency. Since the corrugated fins 21 and the flat fins 22 are alternately arranged, sufficient gaps are left between the corrugated fins 21 and the flat fins 22 to prevent the accumulation of corrosive media therein.

[0035] like Figure 1-6As shown, in this embodiment, graphene polymer composite coating is used as corrosion-resistant coating. Graphene is an ideal two-dimensional structure and has excellent physical and chemical properties. Adding a small amount of graphene to the polymer coating can not only significantly improve the anti-corrosion performance of the coating, but also improve the thermal conductivity, mechanical properties, heat resistance, etc. of the coating.

[0036] like Figure 1-6 As shown, in this embodiment, the connecting elbow 32 and the U-shaped heat exchange tube 31 are fixedly connected by a connecting sleeve 33. The inner diameter of the connecting sleeve 33 corresponds to the outer diameter of the connecting elbow 32 and the U-shaped heat exchange tube 31. An annular connecting plate 34 is fixedly provided on the inner wall of the connecting sleeve 33 by welding. The width of the connecting plate 34 corresponds to the wall thickness of the connecting elbow 32 and the U-shaped heat exchange tube 31. The U-shaped heat exchange tube 31 and the connecting elbow 32 are respectively located on both sides of the connecting plate 34. The inner wall of the connecting sleeve 33 and the two side surfaces of the connecting plate 34 are coated with solder. After the fin group 2, the guard plate group 1 and the U-shaped heat exchange tube 31 group 3 are installed, The connecting sleeve 33 is sleeved on the end of the U-shaped heat exchange tube 31, and the connecting elbow 32 is inserted into the other end of the connecting sleeve 33. Then, the assembled fin heat exchanger is subjected to flame welding. The solder on the inner wall of the connecting sleeve 33 and the two sides of the connecting plate 34 is melted, so that the outer wall of the connecting elbow 32 and the U-shaped heat exchange tube 31 are adhered to the inner wall of the connecting sleeve 33 through the melted solder. At the same time, the ends of the connecting elbow 32 and the U-shaped heat exchange tube 31 are respectively adhered to the two sides of the connecting plate 34 through the melted solder, and the welding is completed, so that the connecting sleeve 33 seals the connecting elbow 32 and the U-shaped heat exchange tube 31.

[0037] The utility model proposes a corrosion-resistant plate-type fin heat exchanger, and its manufacturing process is as follows: spraying corrosion-resistant paint on the upper and lower surfaces of the aluminum alloy sheet, and then punching into corresponding flat fins 22 and corrugated fins 21, and alternately arranging the flat fins 22 and the corrugated fins 21 between the left and right fixing plates 13, and the upper guard plate 11 and the lower guard plate 12 are respectively fixedly connected to the left and right fixing plates 13, and the U-shaped heat exchange tube 31 passes through the through holes on the flat fins 22 and the corrugated fins 21 and the connecting holes on the left and right fixing plates 13, and is fixed to the fin group 2 through the expansion tube, and a connecting sleeve is sleeved on the end of the U-shaped heat exchange tube 31 extending outside the fin group 2 Tube 33, and insert the connecting elbow 32 into the other end of the connecting sleeve 33, so that the adjacent U-shaped heat exchange tubes 31 are connected to each other, and then the assembled fin heat exchanger is subjected to flame welding, and the solder on the inner wall of the connecting sleeve 33 and the two sides of the connecting plate 34 are melted, so that the connecting elbow 32 and the outer wall of the U-shaped heat exchange tube 31 are adhered to the inner wall of the connecting sleeve 33 through the melted solder, and at the same time, the ends of the connecting elbow 32 and the U-shaped heat exchange tube 31 are adhered to the two sides of the connecting plate 34 through the melted solder, and the welding is completed, so that the connecting sleeve 33 seals the connecting elbow 32 and the U-shaped heat exchange tube 31. Aluminum alloy sheets are used as the raw material of the fins, and corrosion-resistant coatings are sprayed on the upper and lower surfaces thereof, which can improve the corrosion resistance of the fins. At the same time, the design of the corrugated fins 21 can increase the heat exchange surface area and improve the heat exchange efficiency. Since the corrugated fins 21 and the flat fins 22 are alternately arranged, sufficient gaps are left between the corrugated fins 21 and the flat fins 22 to prevent the accumulation of corrosive media therein; the lower guard plate 12 is tilted relative to the upper guard plate 11, which can ensure that the condensed water can flow out smoothly while also providing a certain support to the fin group 2 The U-shaped heat exchange tube 31 and the connecting elbow 32 are fixedly connected by the connecting sleeve 33, thereby avoiding the cracking of the U-shaped heat exchange tube 31 caused by mechanical cold working procedures such as "cup mouth" and "flare mouth" implemented in the manufacturing process of the existing heat exchanger, thereby improving the yield of the heat exchanger. The connection strength between the U-shaped heat exchange tube 31 and the connecting elbow 32 is high, and the sealing performance is good, which further ensures the pressure resistance and corrosion resistance of the heat exchanger.

[0038] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A corrosion-resistant plate-type fin heat exchanger, comprising a guard plate group (1), a fin group (2) and a heat exchange tube group (3), wherein the guard plate group (1) comprises an upper guard plate (11), a lower guard plate (12) and left and right fixing plates (13), wherein the upper guard plate (11) and the lower guard plate (12) are fixedly mounted between the left and right fixing plates (13), characterized in that: The fin group (2) is parallel to the left and right fixing plates (13) and the fin group (2) is arranged between the left and right fixing plates (13); the upper end of the fin group (2) is fixedly connected to the upper guard plate (11); the lower guard plate (12) is arranged obliquely relative to the upper guard plate (11) and part of the plate body of the left and right fixing plates (13) is located below the lower guard plate (12); the fin group (2) comprises corrugated fins (21) and flat fins (22) arranged alternately; the heat exchange tube group (3) comprises a U-shaped heat exchange tube (31) passing through the fin group (2) and a connecting elbow (32) for connecting two adjacent U-shaped heat exchange tubes (31); the U-shaped heat exchange tube (31) and the connecting elbow (32) are fixedly connected via a connecting sleeve (33).

2. The corrosion-resistant plate fin heat exchanger according to claim 1, characterized in that: The U-shaped heat exchange tube (31) is inserted into the fin group (2) and fixed to the fin group (2) by means of an expansion tube, and one end of the U-shaped heat exchange tube (31) passes through the fin group (2) and extends to the outside of the guard plate group (1).

3. The corrosion-resistant plate fin heat exchanger according to claim 1, characterized in that: The left and right fixing plates (13) are provided with connection holes for the U-shaped heat exchange tube (31) to pass through, and the upper guard plate (11) and the lower guard plate (12) are provided with a plurality of drainage holes (14).

4. The corrosion-resistant plate fin heat exchanger according to claim 1, characterized in that: The inclination angle α of the lower guard plate (12) is 1°-3°.

5. The corrosion-resistant plate fin heat exchanger according to claim 1, characterized in that: The flat fins (22) and the corrugated fins (21) are both formed by stamping aluminum alloy sheets.

6. The corrosion-resistant plate fin heat exchanger according to claim 1, characterized in that: The upper and lower surfaces of the flat fins (22) and the corrugated fins (21) are sprayed with corrosion-resistant paint, and the corrosion-resistant paint is a graphene polymer composite paint.

7. The corrosion-resistant plate fin heat exchanger according to claim 1, characterized in that: The flat fins (22) and the corrugated fins (21) are both provided with a plurality of through holes for the U-shaped heat exchange tubes (31) to pass through.

8. The corrosion-resistant plate fin heat exchanger according to claim 1, characterized in that: An annular connecting plate (34) is fixedly provided on the inner wall of the connecting sleeve (33) by welding, and the width of the connecting plate (34) corresponds to the wall thickness of the connecting elbow (32) and the U-shaped heat exchange tube (31).

9. The corrosion-resistant plate fin heat exchanger according to claim 8, characterized in that: The inner wall of the connecting sleeve (33) and both side surfaces of the connecting plate (34) are coated with solder.

10. The corrosion-resistant plate fin heat exchanger according to claim 1, characterized in that: The inner diameter of the connecting sleeve (33) corresponds to the outer diameters of the connecting elbow (32) and the U-shaped heat exchange tube (31).

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