A rectangular slotted fin and a heat exchanger having thereon

Abstract

This utility model discloses a rectangular slotted fin, comprising: a fin body, heat exchange tube holes formed on the fin body, and a plurality of blades disposed on the fin body, wherein the blades are connected to the fin body and are set at an angle to the fin body to form a rectangular slot.

Description

Technical Field

[0001] This utility model relates to the field of energy heat exchange equipment technology, specifically to a rectangular slotted fin and a heat exchanger having thereon. Background Technology

[0002] Among evaporation technologies, mechanical vapor recompression (MVR) evaporation technology has the lowest energy consumption and significant advantages in treating high-salinity wastewater. However, the finned tube heat exchangers used in MVR systems typically have lower heat transfer performance due to the physical properties of steam. As a key heat exchange component in MVR systems, the performance of finned tubes directly affects the overall energy consumption of the system. Therefore, improving the heat transfer efficiency of finned tubes is crucial for reducing the operating costs of MVR systems. Utility Model Content

[0003] The purpose of this invention is to overcome the defects in the prior art and provide a rectangular slotted fin and a heat exchanger having thereon.

[0004] To achieve the above objectives, the technical solution adopted in the first aspect of this utility model is as follows:

[0005] A rectangular slotted fin includes: a fin body, heat exchange tube holes formed on the fin body, and a plurality of blades disposed on the fin body, wherein the blades are connected to the fin body and are arranged at an angle to the fin body to form a rectangular slot.

[0006] In one embodiment, the blade is rectangular, having two long sides and two short sides, one of the long sides being connected to the fin body, and the two short sides and the other long side being separated from the fin body.

[0007] In one embodiment, the long side separated from the fin body is further provided with a plurality of triangular slots.

[0008] In one embodiment, the triangular slots are equilateral triangles, and the triangular slots are evenly spaced on the same blade.

[0009] In one embodiment, in the front-to-back direction of the fin body, an inlet section blade, a transition section blade, and an outlet section blade are arranged from front to back. The angle between the inlet section blade and the fin body is greater than the angle between the transition section blade and the fin body, and the angle between the transition section blade and the fin body is greater than the angle between the outlet section blade and the fin body.

[0010] In one embodiment, the angle between the inlet section blade and the fin body is 75°-90°, and / or the angle between the transition section blade and the fin body is 30°-60°, and / or the angle between the outlet section blade and the fin body is 30°-45°.

[0011] In one embodiment, the long side of the rectangular slit is 4-5 mm, and the short side of the rectangular slit is 0.8 mm-1 mm.

[0012] In one embodiment, the spacing between adjacent rectangular slots in the front-rear direction of the fin body is 4-5 mm.

[0013] To achieve the above objectives, the second aspect of this utility model adopts the following technical solution:

[0014] A heat exchanger comprising a plurality of rectangular slotted fins as described above.

[0015] In one embodiment, a plurality of the rectangular slotted fins are arranged at equal intervals in the vertical direction, with the front of the rectangular slotted fins close to the inlet of the heat exchange medium.

[0016] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0017] The rectangular slotted fins of this invention are applied to the steam side of a heat exchanger. Since steam has a relatively low thermal conductivity, the thermal resistance on the steam side becomes the main factor limiting the overall heat transfer performance. The rectangular slotted fins of this invention enhance the heat transfer capacity on the steam side while controlling the flow resistance, thus optimizing the heat transfer performance of the rectangular slotted fins. By setting rectangular slots, the airflow can be cut, the boundary layer can be disrupted, and the fluid turbulence can be increased, thereby improving the convective heat transfer coefficient. Furthermore, by setting blades at an angle to the fin body, compared with ordinary slotted fins, the contact area between the fins and the steam is expanded, the effective heat transfer area is increased, and the heat transfer capacity is improved. Attached Figure Description

[0018] Figure 1 This is a three-dimensional schematic diagram of a rectangular slotted fin in one embodiment of the present invention;

[0019] Figure 2 This is a top view of a rectangular slotted fin in one embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the inlet section blade in one embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the outlet section blade in one embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the transition section blade in one embodiment of the present invention;

[0023] Figure 6 This is a side view of a rectangular slotted fin in one embodiment of the present invention;

[0024] Figure 7 This is a three-dimensional schematic diagram of a heat exchanger in one embodiment of the present invention;

[0025] The numbers on the map are:

[0026] 1-Heat exchanger; 2-Rectangular slotted fin; 21-Fin body; 22-Heat exchange tube hole; 23-Blade; 231-Triangular slot; 232-Inlet section blade; 233-Transition section blade; 234-Outlet section blade; 24-Rectangular slot; X-Steam flow direction. Detailed Implementation

[0027] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] In the description of this utility model, the directions such as "front," "rear," "left," "right," "up," and "down" are explained as follows: Figure 3 As shown in the figure, the upper direction is "front", the lower direction is "rear", the left direction is "left", the right direction is "right", and the direction perpendicular to the viewpoint is "up" and "down". The above definitions of directions are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] like Figure 1-7 As shown, the heat exchanger 1 in some embodiments of this utility model includes a plurality of rectangular slotted fins 2, which are arranged at equal intervals in the vertical direction. In one embodiment, the vertical spacing of the rectangular slotted fins 2 is 2-3 mm. By setting a reasonable spacing of the rectangular slotted fins 2, heat transfer is more favorable. When the spacing is large, although the pressure drop of the rectangular slotted fins 2 is reduced, the airflow preferentially passes through the low resistance area between the rectangular slotted fins 2, resulting in a decrease in the surface heat transfer coefficient of the rectangular slotted fins 2. On the other hand, a smaller spacing will inhibit steam flow and reduce heat exchange efficiency. The 2-3 mm spacing, combined with the slotted turbulence, achieves a relatively excellent heat transfer effect and a small resistance coefficient.

[0030] In this type of heat exchanger 1, the heat exchange medium flows from front to back, and the front of the rectangular slotted fin 2 is located near the inlet of the heat exchange medium (not shown in the figure). In one embodiment, the heat exchange medium is specifically water vapor.

[0031] The rectangular slotted fin 2 includes: a fin body 21, a heat exchange tube hole 22 opened on the fin body 21, and a plurality of blades 23 disposed on the fin body 21. The blades 23 are connected to the fin body 21 and are set at an angle to the fin body 21 to form a rectangular slot 24.

[0032] In one embodiment, the heat exchange tube holes 22 are arranged in a staggered pattern, with a longitudinal tube spacing of 30 mm, a transverse tube spacing of 20 mm, and an outer diameter of 10 mm.

[0033] In one embodiment, the blade 23 is rectangular, having two long sides and two short sides. One long side is connected to the fin body, while the two short sides and the other long side are separate from the fin body. Specifically, in one embodiment, the long and short sides of the blade are equal to the long and short sides of the rectangular slot, respectively. In one embodiment, the long side of the rectangular slot 24 is 4-5 mm long, and the short side is 0.8 mm-1 mm long. In the front-back direction of the fin body 21, the spacing between adjacent rectangular slots 24 is 4-5 mm. The rectangular slot 24 structure can cut the airflow, disrupt the boundary layer, and increase fluid turbulence, thereby improving the convective heat transfer coefficient. By setting a reasonable rectangular slot spacing, the flow dead zone can be reduced, balancing heat transfer performance and pressure drop. At the same time, this spacing range can control the pressure drop within the allowable range, avoiding flow blockage caused by excessively small spacing. If the spacing between adjacent rectangular slots 24 is too large, it will reduce the heat transfer area density; if it is too small, it will increase the processing difficulty and the risk of blockage. Therefore, 4-5 mm is a relatively ideal slot spacing.

[0034] In one embodiment, the long side separated from the fin body 21 is also provided with multiple triangular slots 231. Specifically, the triangular slots 231 are equilateral triangles, and are evenly spaced on the same blade. In one embodiment, three sets of equilateral triangular slots 231 are introduced on the same blade 23. The side length of each set of triangular slots 231 is 0.5mm-0.6mm, arranged in a precisely geometrically symmetrical manner, and the center distance between adjacent triangular slots 231 is strictly controlled at 1.25mm. The triangular slots 231 in this design generate airflow turbulence when airflow passes through, which can disrupt the original laminar boundary layer and enhance the mixing effect between the gas and the surface of the rectangular slotted fin 2. This turbulence not only indirectly expands the effective heat exchange area but also promotes gas exchange between the high-temperature region and the low-temperature region, thereby improving the convective heat transfer efficiency.

[0035] In one embodiment, the steam flow direction X is as follows: Figure 7 As shown, in the front-to-back direction of the fin body 21, there are inlet section blades 232, transition section blades 233, and outlet section blades 234 arranged from front to back. The angle between the inlet section blades 232 and the fin body 21 is greater than the angle between the transition section blades 233 and the fin body 21, and the angle between the transition section blades 233 and the fin body 21 is greater than the angle between the outlet section blades 232 and the fin body 21.

[0036] In one embodiment, the angle between the inlet section blade 232 and the fin body 21 is 75°-90°, the angle between the transition section blade 233 and the fin body 21 is 30°-60°, and the angle between the outlet section blade 234 and the fin body 21 is 30°-45°.

[0037] like Figure 3 As shown, the angle between the inlet section blade 232 and the fin body 21 is 75°, as... Figure 4 As shown, the angle between the transition section blade 233 and the fin body 21 is 45°, as... Figure 5 As shown, the angle between the outlet section blade 234 and the fin body 21 is 30°.

[0038] In one embodiment, the steam flow direction X is as follows: Figure 6 As shown, the rectangular slotted fin 2 is provided with an inlet section blade 232, a transition section blade 233, and an outlet section blade 234 from front to back.

[0039] The blades 23 and the fin body 21 are set with different angles, that is, the appropriate angle is selected according to the temperature change of water vapor in the heat exchanger 1. When the temperature is high near the water vapor inlet, a larger angle (75°-90°) is selected to enhance the turbulence intensity and thus improve the heat exchange efficiency. When the temperature is low near the water vapor outlet, a smaller angle (30°-45°) is selected to reduce the flow resistance and reduce the resistance coefficient. An intermediate angle (30°-60°) is set between the inlet and outlet. At this time, the angle changes with the temperature gradient of water vapor, thereby achieving the optimal match between heat transfer and resistance.

[0040] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A rectangular slotted fin, characterized in that, include: The fin body, the heat exchange tube holes opened on the fin body, and the multiple blades arranged on the fin body, wherein the blades are connected to the fin body and are arranged at an angle to the fin body to form a rectangular slit.

2. The rectangular slotted fin according to claim 1, characterized in that: The blade is rectangular, with two long sides and two short sides. One of the long sides is connected to the fin body, and the two short sides and the other long side are separated from the fin body.

3. The rectangular slotted fin according to claim 2, characterized in that: The long side, which is separate from the fin body, is also provided with multiple triangular slots.

4. The rectangular slotted fin according to claim 3, characterized in that: The triangular slots are equilateral triangles, and the triangular slots are evenly spaced on the same blade.

5. The rectangular slotted fin according to claim 1, characterized in that: In the front-to-back direction of the fin body, an inlet section blade, a transition section blade, and an outlet section blade are arranged from front to back. The angle between the inlet section blade and the fin body is greater than the angle between the transition section blade and the fin body, and the angle between the transition section blade and the fin body is greater than the angle between the outlet section blade and the fin body.

6. The rectangular slotted fin according to claim 5, characterized in that: The angle between the inlet section blade and the fin body is 75°-90°, and / or the angle between the transition section blade and the fin body is 30°-60°, and / or the angle between the outlet section blade and the fin body is 30°-45°.

7. The rectangular slotted fin according to claim 1, characterized in that: The long side of the rectangular slit is 4-5mm, and the short side is 0.8mm-1mm.

8. The rectangular slotted fin according to claim 1, characterized in that: In the front-back direction of the fin body, the spacing between adjacent rectangular slots is 4-5 mm.

9. A heat exchanger, characterized in that, It includes a plurality of rectangular slotted fins as described in any one of claims 1-8.

10. The heat exchanger according to claim 9, characterized in that: Multiple rectangular slotted fins are arranged at equal intervals in the vertical direction, with the front of the rectangular slotted fins close to the inlet of the heat exchange medium.

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