Combined spiral oval tube evaporation air cooler

Abstract

The utility model provides a combined spiral elliptical tube evaporation air cooler relates to evaporation air cooler technical field, it includes the box, is equipped with wet pipe bundle, water cooling assembly, precooling pipe bundle and air cooling assembly from below to above in the box, precooling pipe bundle one end is equipped with input pipe, other end and wet pipe bundle's feed end intercommunication, wet pipe bundle includes a plurality of stages heat exchange unit who arranges and communicates in proper order up and down, every heat exchange unit includes the feed section and the return section who are opposite and intercommunication, the feed section and the return section of first stage heat exchange unit include spiral elliptical tube, the return section of last stage heat exchange unit is connected with output pipe, and it has solved the problem that the hot medium in the straight row or forked row arrangement light pipe of prior art flows easily in the laminar flow state, and the heat transfer resistance is big, leads to the heat exchange efficiency to be limited, and the increase pipe length or pipe row number will increase cost and energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of evaporative air cooler technology, and in particular to a combined spiral elliptical tube evaporative air cooler. Background Technology

[0002] An evaporative air cooler is a composite cooling device that uses the combined effect of water film evaporation and forced air convection to cool the process heat medium inside the tube. When it is working, the heat medium flows through the heat exchange tube, and spray water is evenly sprayed on the outer surface of the heat exchange tube to form a water film. The air flow driven by the fan causes the water film to evaporate and take away the heat, thereby enhancing the heat exchange between the inside and outside of the tube and realizing the efficient cooling or condensation of the heat medium.

[0003] Existing evaporative air coolers generally use a single type of bare tube as the heat exchange tube, and increase the heat exchange area through multi-layer, multi-row straight or staggered tube bundle arrangements. This has the advantages of simple manufacturing and low cost. However, because the inner and outer walls of the bare tube are smooth, the flow of the heat medium is prone to be in a laminar state, the boundary layer is thick, the heat transfer resistance is large, and the heat medium has different requirements for the heat transfer form in different temperature ranges, which often leads to limited overall heat exchange efficiency. In addition, in order to improve the heat exchange effect, traditional designs often increase the number of tube passes or tube rows, but this will significantly increase the system flow resistance, which not only increases the equipment size and pressure drop, but also increases the manufacturing cost and operating energy consumption. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a combined spiral elliptical tube evaporative air cooler, which solves the problems in existing technologies where the heat medium flow in straight or staggered arranged tubes is easily in a laminar flow state, resulting in high heat transfer resistance and limited heat exchange efficiency. Increasing the number of tube passes or tube rows will increase costs and energy consumption.

[0005] According to an embodiment of this utility model, a combined spiral elliptical tube evaporative air cooler includes a housing. Inside the housing, from bottom to top, are arranged a wet tube bundle, a water-cooled assembly, a pre-cooling tube bundle, and an air-cooled assembly. One end of the pre-cooling tube bundle has an input pipe, and the other end is connected to the feed end of the wet tube bundle. The wet tube bundle includes several stages of heat exchange units arranged vertically and connected sequentially. Each heat exchange unit includes a feed section and a return section that are opposite in direction and interconnected. The feed section and return section of the first-stage heat exchange unit include spiral elliptical tubes, and the return section of the last-stage heat exchange unit is connected to an output pipe.

[0006] The working principle of this utility model is as follows: the heat medium first enters the pre-cooling tube bundle through the input pipe for preliminary air cooling, and then enters the wet tube bundle. The spray water from the water-cooling component forms a water film on the outer surface of the wet tube bundle wall. The flowing air causes the water film to evaporate and carry away the heat, realizing heat exchange between the inside and outside of the tube. The first-stage heat exchange unit adopts a spiral elliptical tube. Its unique spiral channel and elliptical cross section can continuously disturb the flow of the heat medium, effectively destroy the flow boundary layer and enhance the turbulence effect, thereby significantly strengthening the heat transfer process. The heat medium flows step by step in multiple heat exchange units that are connected vertically, and finally is discharged through the output pipe, realizing efficient heat exchange in a limited space.

[0007] Furthermore, a small bend is provided at the connection between the feed section and the return section in the same heat exchange unit.

[0008] Furthermore, a large bend is provided at the connection between the feed section and the return section of adjacent heat exchange units.

[0009] Furthermore, the adjacent and connected feed section and return section are arranged at an angle.

[0010] Furthermore, the feed section and return section of the second-stage heat exchange unit include at least one of a spiral elliptical tube or a spiral corrugated tube.

[0011] Furthermore, the feed and return sections of the third and subsequent heat exchange units include at least one of spiral elliptical tubes, spiral corrugated tubes, or smooth tubes.

[0012] Furthermore, a water trap is fixedly installed inside the housing between the water-cooling components and the pre-cooling tube bundle.

[0013] Furthermore, the air-cooling assembly includes at least two fans, which are evenly arranged on the housing.

[0014] Furthermore, the water-cooling assembly includes a spray pump fixed to one side of the bottom of the housing. The inlet of the spray pump is connected to a water tank fixed below the wet tube bundle, and the outlet is connected to a spray pipe fixed above the wet tube bundle. The spray pipe is provided with several spray heads facing the wet tube bundle.

[0015] Furthermore, it also includes an inlet pipe and an outlet pipe. Several of the boxes are arranged side by side, with the input pipe in each box connected in parallel with the inlet pipe, and the output pipe in each box connected in parallel with the outlet pipe.

[0016] Compared with existing technologies, this utility model has the following advantages: By using a spiral elliptical tube as the heat transfer component of the first-stage heat exchange unit in the high-temperature section, its spiral channel structure can continuously disturb the flow of the heat medium. The elliptical cross-section has a larger heat transfer perimeter under the same flow cross-sectional area. Together, they effectively destroy the boundary layer of the heat medium flow and enhance the turbulence effect, significantly improving the heat transfer efficiency. At the same time, the combined multi-stage tube bundle layout applies the spiral elliptical tube to the high-temperature section, making full use of its enhanced heat transfer characteristics to meet the maximum temperature difference heat transfer requirements. While improving the overall heat transfer performance, it avoids the problems of increased flow resistance and energy consumption caused by simply increasing the number of tube passes or tube rows. It achieves efficient heat exchange in a limited space and has the technical effects of compact structure, uniform heat transfer, and low operating energy consumption. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0018] Figure 2 This is a schematic diagram of the internal assembly structure of the water tank in an embodiment of this utility model.

[0019] Figure 3 This is a schematic diagram of the heat exchange unit structure according to an embodiment of the present utility model.

[0020] In the above attached figures: 1. Housing; 11. Input pipe; 12. Output pipe; 13. Connecting pipe; 2. Precooling tube bundle; 3. Wet tube bundle; 31. Heat exchange unit; 311. Feeding section; 312. Return section; 32. Large bend; 33. Small bend; 4. Water trap; 5. Fan; 6. Spray pump; 61. Water tank; 62. Spray pipe; 621. Spray head. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1-3 As shown in the figure, this utility model embodiment proposes a combined spiral elliptical tube evaporative air cooler, which includes a housing 1. The housing 1 is provided with a wet tube bundle 3, a water-cooled component, a pre-cooling tube bundle 2 and an air-cooled component from bottom to top, forming a composite cooling path of pre-cooling followed by evaporative cooling. Specifically, one end of the pre-cooling tube bundle 2 is provided with an input pipe 11 for receiving the heat medium. After being initially cooled by the air-cooled component, it is transported from the other end to the feed end of the wet tube bundle 3 connected to it through a connecting pipe 13. The wet tube bundle 3 includes several stages of heat exchange units 31 arranged vertically and connected in sequence. Each heat exchange unit 31 includes a feed section 311 and a return section 312 with opposite directions and connected to each other. In particular, the feed section 311 and the return section 312 of the first stage heat exchange unit 31 include spiral elliptical tubes. The return section 312 of the last stage heat exchange unit 31 is connected to an output pipe 12 to complete the discharge of the heat medium.

[0023] In this exemplary embodiment, several stages of heat exchange units 31 form a compact S-shaped flow channel to extend the residence time of the heat medium and enhance heat transfer. The spiral channels and elliptical cross-sections of the spiral elliptical tubes work together to disrupt the flow boundary layer, induce turbulence, and increase the heat transfer area, significantly enhancing the heat transfer efficiency in the high-temperature section. The final stage return section 312 connects to the output pipe 12 to complete the discharge of the heat medium. The number of stages of the heat exchange units 31, the diameter and length of the feed section 311 and the return section 312, etc., can be flexibly set according to the actual situation of the heat medium. The materials of the feed section 311 and the discharge section include, but are not limited to, stainless steel, carbon steel, or alloy steel, which have good thermal conductivity, to ensure efficient heat transfer of the heat medium. It is worth noting that, since the wet tube bundle 3 is in a humid and high-temperature environment... If non-corrosion-resistant materials are selected, the outer wall of the pipe also needs to be treated with anti-corrosion measures. At the same time, if the heat medium is corrosive, the inner wall of the pipe also needs to be treated with corresponding anti-corrosion measures. The specific anti-corrosion methods are relatively mature existing technologies, and will not be restricted or elaborated here. As the heat transfer component of the first-stage heat exchange unit 31 in the high-temperature section, the spiral elliptical tube can continuously disturb the flow of the heat medium with its spiral channel structure, making full use of its enhanced heat transfer characteristics to meet the heat exchange demand of the maximum temperature difference. While improving the overall heat exchange performance, it avoids the problem of increased flow resistance and increased energy consumption caused by simply increasing the number of tube passes or tube rows. Without the need to significantly increase the number of tube passes or tube rows, it achieves efficient heat exchange in a limited space, with the technical effects of compact structure, uniform heat exchange and low operating energy consumption.

[0024] The working principle of this utility model is as follows: the heat medium first enters the pre-cooling tube bundle 2 through the input pipe 11 for preliminary air cooling, and then enters the wet tube bundle 3. The spray water sprayed by the water-cooling component forms a water film on the outer surface of the tube wall of the wet tube bundle 3. The flowing air causes the water film to evaporate and take away the heat, realizing the heat exchange between the inside and outside of the tube. The first-stage heat exchange unit 31 adopts a spiral elliptical tube. Its unique spiral channel and elliptical cross section can continuously disturb the flow of the heat medium, effectively destroy the flow boundary layer and enhance the turbulence effect, thereby significantly strengthening the heat transfer process. The heat medium flows step by step in the multiple heat exchange units 31 connected vertically, and finally is discharged through the output pipe 12, realizing efficient heat exchange in a limited space.

[0025] like Figure 1-3As shown, in another embodiment, a small bend 33 is provided at the connection between the feed section 311 and the return section 312 in the same heat exchange unit 31, and a large bend 32 is provided at the connection between the feed section 311 and the return section 312 of adjacent heat exchange units 31. The radius of the large bend 32 is larger than that of the small bend 33. The materials of the large bend 32 and the small bend 33 are the same as those of the feed section 311 and the return section 312, and their inner and outer walls also need to be treated with corresponding anti-corrosion measures according to the environment and the type of heat medium. Furthermore, the large bend 32, the small bend 33, the feed section 311, and the return section 312 can be fixedly connected by welding or by detachable fixing methods such as threaded engagement. In this way, each section of the structure can be installed and disassembled quickly and independently, which facilitates efficient inspection and maintenance. Operational or structural layout adjustments; Based on the above settings, the small bend 33 adopts a short arc structure with a smooth inner wall to achieve compact flow channel turning, optimize spatial layout, and effectively reduce the flow dead zone inside the unit while maintaining the flow velocity of the heat medium, ensuring that it can more flexibly cope with the possible changes in the flow state of the heat medium when switching between different stages of heat exchange units 31. The smooth transition arc structure of the large bend 32 significantly reduces the local resistance and pressure loss caused by the sudden change in the flow direction of the heat medium, which is conducive to dispersing thermal stress and reducing the tendency of particulate matter to deposit at the bend. By differentiating the settings of the large and small bends 33, the efficient disturbance and heat exchange continuity of the fluid inside the unit are ensured, and the overall pressure drop of the system is optimized and controlled, thereby improving the stability and energy efficiency of the equipment operation.

[0026] like Figure 1-3 As shown, in another embodiment, the adjacent and connected feed section 311 and return section 312 are set at an angle, preferably between 10° and 30°. The angle increases the turning angle of the heat medium, making the flow path smoother and more natural, further reducing the local resistance and energy loss of the heat medium at the turning point, effectively reducing the risk of impurity deposition caused by flow dead zones, and enabling the system to better maintain stable heat exchange performance and flow characteristics during long-term operation.

[0027] like Figure 1-3As shown, in another embodiment, considering the working condition that the temperature of the heat medium decreases and the viscosity may increase after the heat medium is cooled by successive heat exchange, the feed section 311 and return section 312 of the second-stage heat exchange unit 31 include at least one of spiral elliptical tube or spiral corrugated tube, and the feed section 311 and return section 312 of the third-stage and subsequent heat exchange units 31 include at least one of spiral elliptical tube, spiral corrugated tube or smooth tube. Based on the above settings, the spiral corrugated tube can moderately reduce the flow resistance while maintaining good turbulence characteristics, which helps to balance the heat exchange efficiency and the system pressure drop. The smooth tube has a lower cost and is easier to process. Its smooth inner wall has low flow resistance, which is conducive to further reducing the system pressure drop while ensuring basic heat exchange performance. As the heat medium is cooled by successive heat exchange, its heat exchange demand is relatively reduced. The number of stages and tube type of the heat exchange unit 31 can be flexibly selected according to the actual situation to achieve precise matching of different tube types and heat medium states in different temperature ranges. This allows the heat exchange units 31 at each stage to give full play to their structural advantages and achieves a perfect match between heat transfer performance, pressure drop control and manufacturing cost.

[0028] like Figure 1-2 As shown, in another embodiment, a water trap 4 is fixedly installed inside the housing 1 between the water-cooling components and the pre-cooling tube bundle 2. The water trap 4 is horizontally fixed inside the housing 1 in the form of a corrugated plate or a mesh structure, effectively separating the lower wet tube bundle 3 area from the upper pre-cooling tube bundle 2 and the space where the air-cooling components are located. Based on the above configuration, the water trap 4 can intercept and condense water droplets and water mist carried by the rising airflow during the evaporative cooling process in the area where the wet tube bundle 3 is located, preventing water from escaping into the pre-cooling area. This reduces the loss of spray water and avoids scaling or corrosion that water may cause on the outer surface of the pre-cooling tube bundle 2, keeping the pre-cooling section in a dry heat exchange state and ensuring its designed heat exchange efficiency. The collected water droplets flow back down along the surface of the water trap 4, realizing the recycling of water resources and improving the economy and stability of the system operation.

[0029] like Figure 1-2 As shown, in another embodiment, the air-cooling assembly includes at least two fans 5, which are evenly arranged on the housing 1 with their air outlets facing downwards. This ensures that the airflow field is evenly distributed across the cross-sections of the pre-cooling tube bundle 2 and the wet tube bundle 3, avoiding the formation of local airflow short circuits or low-speed dead zones. The forced convection air generated first passes through the pre-cooling tube bundle 2 to achieve initial air cooling, and then evenly penetrates into the lower wet tube bundle 3 area, promoting the evaporation of the water film outside the tubes and enhancing heat exchange, thereby improving the heat exchange effect.

[0030] like Figure 1-2As shown, in another embodiment, the water-cooling assembly includes a spray pump 6 fixed to one side of the bottom of the housing 1. Its inlet end is connected to a water tank 61 fixed directly below the wet tube bundle 3 via a pipe, and its outlet end is connected to a spray pipe 62 fixed above the wet tube bundle 3 via a vertical pipe. The spray pipe 62 is arranged along the axial direction of the wet tube bundle 3 and is provided with several evenly distributed spray heads 621. The water outlet direction of the spray heads 621 is perpendicular to the downward wet tube bundle 3. In this embodiment, the spray pump 6 continuously delivers cooling water from the water tank 61 to the spray pipe 62. The spray heads 621 form a uniform water curtain covering the outer surface of the wet tube bundle 3, forming a continuous water film on the pipe wall to enhance the evaporative heat exchange effect. At the same time, the unevaporated water falls back to the water tank 61 under the action of gravity to complete the recycling. This not only ensures sufficient wetting and efficient heat exchange in the area of ​​the wet tube bundle 3, but also realizes efficient recovery and recycling of water resources.

[0031] like Figure 1-2 As shown, in another embodiment, the device further includes an inlet pipe (not shown) and an outlet pipe (not shown). The inlet pipe is used for the total input of the heat medium to be cooled, and the outlet pipe is used for the total output of the cooled heat medium. Several boxes 1 are arranged in parallel. The input pipe 11 in each box 1 is connected in parallel with the horizontally arranged inlet pipe to ensure that the heat medium can be evenly distributed to the pre-cooling tube bundle 2 in each box 1. The output pipe 12 in each box 1 is connected in parallel with the horizontally arranged outlet pipe to allow the cooled heat medium to be collected and output. The parallel operation of multiple boxes 1 is achieved by sharing the inlet and outlet pipes. Based on the above configuration, the overall processing capacity of the device is significantly improved by the parallel combination of the system. Each of the above pipes is equipped with a valve that can control its opening and closing, so that each box 1 can be operated or repaired independently, which not only ensures the flexibility of system expansion, but also improves the convenience and reliability of equipment operation and maintenance.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A combined spiral elliptical tube evaporative air cooler, comprising a housing (1), wherein a wet tube bundle (3), a water-cooled assembly, a pre-cooled tube bundle (2), and an air-cooled assembly are arranged sequentially from bottom to top inside the housing (1), characterized in that: The precooling tube bundle (2) has an input pipe (11) at one end and is connected to the feed end of the wet tube bundle (3) at the other end. The wet tube bundle (3) includes several heat exchange units (31) arranged vertically and connected in sequence. Each heat exchange unit (31) includes a feed section (311) and a return section (312) that are opposite in direction and connected to each other. The feed section (311) and the return section (312) of the first heat exchange unit (31) include spiral elliptical tubes. The return section (312) of the last heat exchange unit (31) is connected to an output pipe (12).

2. The combined spiral elliptical tube evaporator air cooler as described in claim 1, characterized in that: A small bend (33) is provided at the connection between the feed section (311) and the return section (312) in the same heat exchange unit (31).

3. The combined spiral elliptical tube evaporator air cooler as described in claim 2, characterized in that: A large bend (32) is provided at the connection between the feed section (311) and the return section (312) of the adjacent heat exchange unit (31).

4. The combined spiral elliptical tube evaporator air cooler as described in claim 1, characterized in that: The adjacent and connected feed section (311) and return section (312) are arranged at an angle.

5. A combined spiral elliptical tube evaporator air cooler as described in claim 1, characterized in that: The feed section (311) and return section (312) of the second-stage heat exchange unit (31) include at least one of a spiral elliptical tube or a spiral corrugated tube.

6. A combined spiral elliptical tube evaporator air cooler as described in claim 5, characterized in that: The feed section (311) and return section (312) of the third and subsequent heat exchange units (31) include at least one of a spiral elliptical tube, a spiral corrugated tube, or a smooth tube.

7. A combined spiral elliptical tube evaporator air cooler as described in claim 1, characterized in that: A water trap (4) is fixedly installed between the water-cooling components and the pre-cooling tube bundle (2) inside the box (1).

8. A combined spiral elliptical tube evaporator air cooler as described in claim 1, characterized in that: The air-cooled assembly includes at least two fans (5), which are evenly arranged on the housing (1).

9. A combined spiral elliptical tube evaporator air cooler as described in claim 1, characterized in that: The water-cooling assembly includes a spray pump (6) fixed to one side of the bottom of the housing (1). The inlet of the spray pump (6) is connected to a water tank (61) fixed below the wet tube bundle (3), and the outlet is connected to a spray pipe (62) fixed above the wet tube bundle (3). The spray pipe (62) is provided with a plurality of spray heads (621) facing the wet tube bundle (3).

10. A combined spiral elliptical tube evaporator air cooler as described in claim 1, characterized in that: It also includes an inlet pipe and an outlet pipe. Several of the boxes (1) are arranged in parallel. The input pipe (11) in each box (1) is connected in parallel with the inlet pipe, and the output pipe (12) in each box (1) is connected in parallel with the outlet pipe.

Images