Energy-saving dry-wet closed cooling tower

Abstract

The invention provides an energy-saving dry-wet closed cooling tower, and relates to the technical field of heat exchange devices. Comprising a shell, a fan arranged at the top of the shell, an air inlet formed in the side wall of the shell, a heat exchange mechanism and a spraying mechanism which are arranged in the shell, a heat inlet pipe and a cold outlet pipe which are connected to an inlet and an outlet of the heat exchange mechanism correspondingly, and a cooling pipe used for supplying cooling water to the spraying mechanism. Each heat exchange tube is longitudinally folded in an S shape to form a multi-layer structure which is mutually spaced, each layer of heat exchange tube is wound to form a plurality of ring-shaped structures, and the ring-shaped structures on each layer of heat exchange tube are mutually aligned in the longitudinal direction. The cooling tower is excellent in heat exchange efficiency, capable of effectively reducing equipment operation energy consumption, high in space utilization rate and beneficial to achieving compact and efficient installation and maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange devices, and particularly to an energy-saving dry-wet closed cooling tower. Background Art

[0002] During the operation of traditional dry-wet closed cooling towers, there are many technical problems to be solved urgently. First of all, the low heat exchange efficiency is one of the more prominent problems. The heat exchange tube structure of traditional cooling towers is simply designed. The flow path of the cooling medium in the heat exchange tube is short and single, and the contact area with the spray water is limited, resulting in the inability to transfer heat fully and quickly, making the cooling effect unsatisfactory and difficult to meet the cooling requirements under high-load conditions. Secondly, the large energy consumption is also a key problem. In order to achieve a certain cooling effect, traditional cooling towers often require the fan to operate at a high speed, and at the same time, the spray system also needs to supply a large amount of water continuously, which undoubtedly increases the operating energy consumption of the entire cooling tower and raises the usage cost. In addition, the space utilization rate of the equipment is relatively low. The layout of traditional heat exchange tubes and spray mechanisms makes the internal space of the cooling tower not fully utilized, resulting in a larger overall volume of the equipment, more floor area, and increasing the difficulty of installation and maintenance. Summary of the Invention

[0003] In view of the above problems, the present invention provides an energy-saving dry-wet closed cooling tower, which has excellent heat exchange efficiency, can effectively reduce the operating energy consumption of the equipment, and has a high space utilization rate, which is conducive to realizing compact and efficient installation and maintenance.

[0004] The above technical object of the present invention is achieved by the following technical solutions: An energy-saving dry-wet closed cooling tower, including a housing, a fan provided at the top of the housing, an air inlet provided on the side wall of the housing, a heat exchange mechanism and a spray mechanism provided inside the housing, an inlet heat pipe and an outlet cold pipe respectively connected to the inlet and outlet of the heat exchange mechanism, and a cooling pipe for supplying cooling water to the spray mechanism; The heat exchange mechanism includes a plurality of interconnected heat exchange tubes. Each heat exchange tube is longitudinally folded in an S shape into a multi-layer structure with intervals. Each layer of the heat exchange tubes is wound to form a plurality of loop-shaped structures. The loop-shaped structures on each layer of the heat exchange tubes are longitudinally aligned with each other, thereby forming a plurality of longitudinal cylindrical through channels composed of the loop-shaped structures; The spray mechanism includes a plurality of spray pipes. Each spray pipe is provided with a plurality of nozzles. Each spray pipe is inserted into each of the through channels in one-to-one correspondence.

[0005] Furthermore, the inner diameters of the circular structures that constitute the same through-channel are arranged in an alternating pattern along the longitudinal direction. Specifically, the inner diameters of some of the circular structures increase sequentially, while those of the other part decrease sequentially, with the increases and decreases arranged alternately.

[0006] Furthermore, a number of fins are provided on each heat exchange tube.

[0007] Furthermore, the fins are arranged in an annular array around each through-channel, and each fin is penetrated by the heat exchange tube.

[0008] Furthermore, a water collecting tank for collecting condensed water and excess sprayed water is provided at the inner bottom of the outer shell.

[0009] Furthermore, at least one drain pipe leading to the inside of the water collecting tank is provided on the outer shell, and the drain pipe is externally connected to the input end of the cooling device.

[0010] Furthermore, a return pipe is connected between the output end of the cooling device and the cooling pipe.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: The heat exchange mechanism of the present invention uses multiple heat exchange tubes that are interconnected and longitudinally folded into a multi-layer structure in an S shape. Each layer is wound to form a plurality of circular structures, and the circular structures of each layer are longitudinally aligned to form a longitudinal cylindrical through-channel. This design extends the flow path of the cooling medium in the heat exchange tube, increases the contact time and area between the cooling medium and the wall surface of the heat exchange tube. At the same time, the spray pipe of the spraying mechanism is inserted into the through-channel, and the nozzles evenly spray cooling water, further increasing the contact area between the cooling water and the heat exchange tube, thereby significantly improving the heat exchange efficiency, being able to more effectively reduce the temperature of the cooling medium, and meeting the cooling requirements under different working conditions. Due to the improvement of the heat exchange efficiency, when achieving the same cooling effect, the fan speed can be reduced, reducing the motor energy consumption. The spraying system can also operate with a more appropriate water volume, reducing the pump energy consumption, and overall reducing the operating energy consumption of the cooling tower, saving the operating cost for the enterprise.

[0012] In addition, the multi-layer folding structure of the heat exchange tube of the present invention and the corresponding design of the spray pipe and the through-channel optimize the internal space layout of the cooling tower. More heat exchange tubes and spray pipes are arranged in a limited space, increasing the heat exchange area and the spray coverage range. While improving the cooling effect, the equipment volume and floor area are reduced, facilitating installation and maintenance, and reducing the installation and site occupation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic diagram of the overall structure of the cooling tower of the present invention; Figure 2 is a schematic diagram of the internal structure of the outer shell of the cooling tower of the present invention; Figure 3 This is an assembly schematic diagram of the heat exchange mechanism and the spraying mechanism of the cooling tower of the present invention; Figure 4 This is an overall structural schematic diagram of the heat exchange mechanism of the cooling tower of the present invention; Figure 5 This is a detailed structural diagram of the heat exchange mechanism of the cooling tower of the present invention; Figure 6 This is a detailed structural diagram of the heat exchange tube of the cooling tower of the present invention; Figure 7 This is an overall structural schematic diagram of the spraying mechanism of the cooling tower of the present invention; Figure 8 This is a detailed structural diagram of the spraying mechanism of the cooling tower of the present invention.

[0014] In the figure: 1, outer shell; 2, fan; 3, air inlet; 4, inlet heat pipe; 5, outlet cold pipe; 6, heat exchange mechanism; 601, heat exchange tube; 602, fin; 7, cooling pipe; 8, spraying mechanism; 801, spraying pipe; 802, nozzle; 9, water collecting tank; 10, drain pipe; 11, cooling equipment; 12, return water pipe. Detailed implementation manners

[0015] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0016] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0017] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0018] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral body; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] Please refer to Figure 1-8 , this embodiment provides an energy-saving wet-dry closed cooling tower, which includes a housing 1, a fan 2 provided at the top of the housing 1, an air inlet 3 provided on the side wall of the housing 1, a heat exchange mechanism 6 and a spraying mechanism 8 provided inside the housing 1, an inlet heat pipe 4 and an outlet cold pipe 5 respectively connected to the inlet and outlet of the heat exchange mechanism 6, and a cooling pipe 7 for supplying cooling water to the spraying mechanism 8. The housing 1 provides a closed space for the entire cooling tower, protecting the internal equipment from the influence of the external environment, such as rain, dust, etc., and at the same time helping to maintain the air flow environment inside the cooling tower and ensuring the smooth progress of the ventilation and heat dissipation process. When the cooling tower is working, the fan 2 generates a strong suction force through rotation, forming a power source for air flow, enabling the outside air to enter the inside of the cooling tower from the air inlet 3 and discharging the hot air from the top, effectively promoting the heat dissipation inside the cooling tower and improving the cooling efficiency. The inlet heat pipe 4 is responsible for introducing the high-temperature cooling medium into the heat exchange mechanism 6, and the outlet cold pipe 5 leads out the low-temperature cooling medium after cooling from the heat exchange mechanism 6, realizing the circular flow of the cooling medium inside the cooling tower and ensuring the continuity and stability of the entire cooling process.

[0020] The heat exchange mechanism 6 includes a plurality of heat exchange tubes 601 that are interconnected. Each heat exchange tube 601 is longitudinally folded in an S shape into multiple layers spaced apart from each other. Each layer of the heat exchange tubes 601 is wound to form a plurality of loop-shaped structures. The loop-shaped structures on each layer of the heat exchange tubes 601 are longitudinally aligned with each other, thereby forming a plurality of longitudinal cylindrical through channels composed of the loop-shaped structures. These heat dissipation tubes are the key structures for realizing the heat exchange between the cooling medium and the outside world. Their unique S-shaped longitudinal folding and multi-layer loop-shaped structure design greatly increase the flow path and heat exchange area of the cooling medium, improve the heat exchange efficiency, and enable the cooling medium to be fully cooled in a limited space.

[0021] The spraying mechanism 8 includes multiple spraying pipes 801, and a plurality of nozzles 802 are provided on each spraying pipe 801. Each spraying pipe 801 is correspondingly inserted into each through-channel. The multiple spraying pipes 801 and the plurality of nozzles 802 thereon can evenly spray cooling water on the surface of the heat exchange pipe 601, increasing the contact area between the cooling water and the heat exchange pipe 601, strengthening the cooling effect. The design of the corresponding insertion of the spraying pipe 801 and the through-channel ensures that the cooling water can accurately cover the heat exchange pipe 601, improving the utilization rate of the cooling water.

[0022] To achieve the best balance between energy conservation and operating efficiency, temperature sensors, humidity sensors, water temperature detection devices and other automated sensing elements can be set at key parts of the cooling tower in this device. By collecting the temperature of the process fluid in the inlet heat pipe 4, the temperature of the cooled fluid in the outlet cold pipe 5, the external ambient air temperature and humidity data, the system can evaluate the cooling demand in real time. When the external ambient temperature is relatively low or the cooling load is small, the control system automatically enables the dry cooling mode, and the spraying system remains closed, reducing water consumption. When the ambient temperature rises, the heat exchange demand increases or the cooling effect fails to reach the set threshold, the system automatically switches to the wet operating mode and activates the spraying device to enhance the evaporative cooling effect. The entire mode switching process can be automatically completed by the PLC controller or the embedded control system, and the operating logic, threshold parameters and intelligent judgment algorithms can be preset to achieve unattended, rapid response, energy-saving and efficient full-automatic cooling operation management.

[0023] Specifically, when the ambient temperature is relatively low or the cooling load is small, the device enters the dry operating mode. At this time, the fan 2 starts, introducing the external cold air into the cooling tower through the air inlet 3, flowing upward along the longitudinal cylindrical through-channel, and performing forced convection heat exchange with the surface of the heat exchange pipe 601 in the heat exchange mechanism 6. After the high-temperature process fluid enters the heat exchange pipe 601 through the inlet heat pipe 4, it flows along the S-shaped folded multi-layer circular channel and continuously transfers heat to the pipe wall. Since the air flow continuously takes away heat during the process of passing through each circular structure layer, the temperature of the fluid in the heat exchange pipe 601 gradually decreases. In this process, the spraying mechanism 8 is not started and no cooling water is consumed, thus realizing pure air-cooled heat exchange, effectively saving water resources and reducing operating costs, and being applicable to winter or scenarios with relatively high air humidity.

[0024] When the ambient temperature is high, the cooling demand increases, or the dry cooling effect is insufficient, the device enters the wet operation mode. In addition to the normal operation of the fan 2 to maintain the air flow through the channel, the spraying mechanism 8 is also started synchronously. The cooling water is transported to the spray pipe 801 through the cooling pipe 7. Each spray pipe 801 is correspondingly inserted into each longitudinal channel, and the nozzles 802 evenly spray the cooling water onto the surface of the circular structure of the heat exchange pipe 601 to form a continuous water film. The water film absorbs the heat conducted from the outer wall of the heat exchange pipe 601 and quickly evaporates under the action of the air flow, taking away a large amount of latent heat, thus significantly improving the cooling efficiency. The cooled process fluid is output from the cold outlet pipe 5 to complete the heat exchange. The cooling water that has not been completely evaporated can be recycled through the water collection system to ensure the dual goals of the system operation efficiency and water-saving performance. The wet operation is suitable for industrial occasions with high temperature and large heat load in summer, with strong cooling capacity and large temperature drop range.

[0025] Whether in the dry mode or the wet mode, the high-temperature cooling medium enters the heat exchange mechanism 6 through the hot inlet pipe 4. In the heat exchange mechanism 6, the cooling medium enters multiple interconnected heat exchange pipes 601. Since each heat exchange pipe 601 is longitudinally folded in an S shape into multiple spaced layers, the cooling medium flows tortuously along the S-shaped path inside the heat exchange pipe 601, greatly extending the flow path. Each layer of the heat exchange pipe 601 is also wound to form multiple circular structures, and the circular structures on each layer of the heat exchange pipe 601 are longitudinally aligned with each other to form multiple longitudinal cylindrical through channels, which enables the cooling medium to continuously change the flow direction during the flow process, further enhancing the contact and heat exchange with the wall surface of the heat exchange pipe 601. During the flow of the cooling medium inside the heat exchange pipe 601, the heat it carries is transferred to the wall surface of the heat exchange pipe 601. After sufficient heat exchange, the temperature of the cooling medium decreases and it flows out of the heat exchange mechanism 6 through the cold outlet pipe 5 and enters the subsequent process flow or equipment for continued use. And when the fan 2 is started, an air flow channel from the air inlet 3 to the fan 2 is formed inside the cooling tower. The outside air enters the inside of the cooling tower from the air inlet 3 on the side wall of the outer shell 1 and comes into full contact with the heat exchange pipe 601 after spraying and the cooling water. The air absorbs the heat generated by the evaporation of the cooling water and the heat dissipated from the surface of the heat exchange pipe 601, and the temperature rises. The hot air is discharged from the top of the outer shell 1 of the cooling tower under the suction of the fan 2, thus realizing the dissipation of the heat inside the cooling tower and ensuring the continuous and stable operation of the cooling tower.

[0026] In the wet mode, cooling water is supplied to the spraying mechanism 8 through the cooling pipe 7. The spraying mechanism 8 includes a plurality of spraying pipes 801, and a plurality of nozzles 802 are provided on each spraying pipe 801. Each spraying pipe 801 is inserted into each through-channel in one-to-one correspondence, and the cooling water is evenly sprayed out from the nozzles 802 to form fine water droplets or water mist, which is sprayed on the surface of the heat exchange pipe 601. After the cooling water contacts the surface of the heat exchange pipe 601, it absorbs the heat transferred from the heat exchange pipe 601 and raises its own temperature. Part of the cooling water evaporates due to heat, taking away the heat in the form of latent heat of vaporization, further enhancing the cooling effect. In this mode, the fan 2 continuously operates, and the high-speed air flow flowing from bottom to top will pass through these through-channels. In this way, on the one hand, it can delay the sinking of the water mist. When the air flow passes through the longitudinal cylindrical through-channels formed by each ring-shaped structure, it forms a relative movement with the water mist sprayed out from the nozzles 802. The air flow generates an upward lifting force on the water mist, so that the water mist is hindered during the descending process, thereby delaying the sinking speed of the water mist. This enables the water mist to stay in the air for a longer time and have a greater chance of colliding and contacting with the heat exchange pipe 601. The water mist that originally sank quickly may have fallen before fully contacting the heat exchange pipe 601. After the air flow delays its sinking, the water mist can be more widely distributed in the space around the heat exchange pipe 601 and has more possibilities to contact various parts of the heat exchange pipe 601, greatly improving the contact efficiency between the cooling water and the heat exchange pipe 601 and enhancing the heat exchange effect. On the other hand, the air flow promotes the formation of turbulent flow of the sprayed water mist. When the high-speed air flow interacts with the water mist, the irregular flow of the air flow will disturb the water mist, making the originally relatively orderly flow of the water mist become disordered. This turbulent flow state breaks the original stable flow pattern of the water mist, accelerating the movement and collision of the water mist. The water mist particles collide and merge with each other and then disperse. During this process, the surface area of the water mist constantly changes, increasing the contact area with the air and the heat exchange pipe 601. At the same time, the turbulent flow also enables the water mist to contact the surface of the heat exchange pipe 601 more fully, improving the cooling effect of the cooling water on the heat exchange pipe 601. Moreover, in the turbulent flow state, the mixing of the water mist and the air is more sufficient, which is beneficial to the evaporation of the cooling water. Since evaporation requires sufficient contact between water and air, the turbulent flow can ensure the sufficiency of this contact, thereby further strengthening the cooling capacity of the cooling tower, enabling the cooling tower to achieve a better cooling effect under the same energy consumption and improving the energy utilization efficiency.

[0027] Through the above technical solutions, the energy-saving wet and dry closed cooling tower significantly improves the heat exchange efficiency through the unique design of the heat exchange tubes 601 and the spraying mechanism 8. The heat exchange tubes 601 are longitudinally folded in an S shape into multiple layers spaced apart from each other, and each layer is wound to form a plurality of loop-shaped structures. The loop-shaped structures of each layer are longitudinally aligned with each other to form a plurality of longitudinal cylindrical through channels. This design greatly increases the flow path length of the cooling medium within the heat exchange tubes 601, enabling the cooling medium to more fully exchange heat with the outside world within a limited space. At the same time, multiple spray pipes 801 of the spraying mechanism 8 are inserted into the respective through channels one by one, and a plurality of nozzles 802 on the spray pipes 801 can evenly spray cooling water on the surface of the heat exchange tubes 601, increasing the contact area between the cooling water and the heat exchange tubes 601, thereby achieving efficient heat exchange, effectively reducing the temperature of the cooling medium, and meeting the cooling requirements under various high-load conditions.

[0028] Due to the improvement in heat exchange efficiency, the operating parameters of the fan 2 and the spraying system can be correspondingly reduced when the cooling tower achieves the same cooling effect. The fan 2 does not need to operate at too high a speed to ensure good ventilation effects, reducing the energy consumption of the motor, and the spraying system can also spray with a more reasonable amount of water, reducing the energy consumption of the water pump.

[0029] In addition, the multi-layer folding structure of the heat exchange tubes 601 and the corresponding insertion design of the spray pipes 801 and the through channels make full use of the internal space of the cooling tower. Within the limited space of the outer shell 1, more heat exchange tubes 601 and spray pipes 801 can be arranged, increasing the heat exchange area and the spraying coverage range. Thus, while improving the cooling effect, the overall volume and floor area of the equipment are reduced, facilitating the installation and maintenance of the equipment, and reducing the installation cost and site occupation cost.

[0030] Furthermore, as Figure 6As shown, the inner diameters of the ring-shaped structures constituting the same through-channel are arranged in an alternating manner along the longitudinal direction, specifically, the inner diameters of a part of the ring-shaped structures increase successively, and the inner diameters of the other part of the ring-shaped structures decrease successively, wherein the increasing and decreasing are arranged alternately. First, the inner diameters of the ring-shaped structures increase and decrease alternately along the longitudinal direction to form a "zooming corrugated channel", which will produce a periodic acceleration and deceleration effect on the air flow passing through. When the inner diameter decreases, the channel narrows and the airflow speed increases, and when the inner diameter increases, the channel expands and the airflow speed slows down. This change creates a local pressure difference area similar to the Venturi effect, causing turbulence and eddy currents. By introducing strong disturbances in the through-channel, the contact frequency between the air and the surface of the heat exchange tube 601, and between the air and the spray water mist can be significantly increased, breaking the boundary layer and improving the heat exchange efficiency. Secondly, in the wet operation mode, the spray water mist falls along the direction of gravity after being sprayed from the nozzle 802. If the channel has a constant diameter, the water mist is easy to settle quickly, and the alternating inner diameter structure forms an "airflow barrier belt" with airflow contraction-expansion cycle changes, which enhances the force disturbance of the water mist particles and slows down their settling speed. The longer the water mist stays in the air, the greater the probability of contact with the heat exchange tube 601, thereby significantly improving the utilization rate of cooling water and the evaporative cooling effect. And after the inner diameter changes alternately, the distribution state of the spray water on the surface of the ring structure also changes accordingly, and the contact area between the water droplets and the surface of the cooling tube 7 is more randomized and non-uniform, which helps to break the problem of insufficient local cooling caused by continuous spraying. During the heat exchange process, the cooling environment of different sections of the heat exchange tube 601 is more balanced, avoiding the occurrence of hot or cold areas, which is beneficial to the stability of the overall heat exchange process. In addition, the change in the inner diameter brings a sense of "undulation" in the structure, making the internal surface of the entire through-channel wavy. The air forms spiral disturbances or secondary flows during the flow, which prolongs the airflow's residence path on the heat exchange surface. This path extension is equivalent to increasing the heat exchange time and surface area per unit volume, improving the efficiency of heat transfer, and allowing the cooling medium to cool more fully. In dry operation, the airflow disturbance is stronger, which improves the convective heat transfer capacity under air-cooled conditions. In wet operation, the mixing of water mist and air is more complete, which is also conducive to efficient evaporative heat dissipation. The alternating inner diameter structure can therefore provide enhanced heat exchange support in both modes, and has strong mode adaptability and environmental adaptability.

[0031] Further, such as Figure 4As shown, a number of fins 602 are provided on each heat exchange tube 601. The arrangement of the fins 602 directly increases the contact area between the heat exchange tube 601 and the external medium (air or cooling water). During the operation of the cooling tower, whether it is the convective heat transfer between air and the heat exchange tube 601 in the dry mode or the contact heat transfer between cooling water and the heat exchange tube 601 in the wet mode, the fins 602 are equivalent to expanding the "effective action range" of the heat exchange tube 601. More surface area means more areas can participate in heat exchange, thus greatly strengthening the heat exchange process and enabling the cooling medium to transfer heat more efficiently when flowing inside the heat exchange tube 601. And when the fluid (air or cooling water) flows over the surface of the heat exchange tube 601, a boundary layer will be formed, which will hinder the heat transfer. The existence of the fins 602 can disrupt this boundary layer, making the heat exchange between the fluid and the surface of the heat exchange tube 601 more direct and efficient. During the air flow, the fins 602 will cause local disturbances and turbulences in the air, breaking the stable state of the boundary layer and allowing fresh air to contact the surface of the heat exchange tube 601 more frequently to carry away heat; in the wet mode, when the cooling water flows over the surface of the fins 602, the boundary layer will also be disrupted due to the interference of the fins 602, enhancing the heat exchange between the water and the heat exchange tube 601.

[0032] Furthermore, as Figure 5 shown, the fins 602 are arranged in a circular array around each through-channel, and each fin 602 is penetrated by the heat exchange tube 601, resulting in a good heat conduction path between the heat exchange tube 601 and the fins 602, so that the heat of the high-temperature medium inside the heat exchange tube 601 can not only be conducted to its own tube wall, but also be further dissipated through the fins 602 to a larger outer surface, effectively reducing the thermal resistance on the surface of the heat exchange tube 601. In the dry mode, air flows in the through-channel, and the circular fins 602 cause frequent disturbances and turbulences on their surfaces. This kind of disturbance breaks the boundary layer attached to the surfaces of the fins 602 and the heat exchange tube 601, promoting the direct contact and heat exchange between the air and the surfaces of the heat exchange tube 601 and the fins 602, and significantly improving the convective heat transfer efficiency. In the wet operation mode, the cooling water is sprayed from the nozzle 802 onto the surfaces of the fins 602 and the heat exchange tube 601 to form a water film. The circular distribution of the fin 602 structure enhances the adhesion and diffusion effect of the water film, and at the same time makes the water flow form a turbulent flow on its surface, effectively avoiding local deposition or flow dead corners of the cooling water, and improving the uniformity and cooling efficiency of the water film coverage; in addition, the latent heat of vaporization absorbed by the evaporation of the water film on the fins 602 can also greatly enhance the overall heat dissipation capacity. At the same time, the coupling of the fin 602 array and the through-channel enhances the multi-dimensional interaction between the air, water mist and the heat exchange structure. Under the action of the longitudinal air flow formed by the fan 2, the relative movement between the air and the fins 602 is intensified, prolonging the contact time between the air flow and the heat exchange interface and enhancing the heat transfer per unit time.

[0033] Furthermore, as Figure 2 shown, a water collecting tank 9 for collecting condensed water and excess sprayed water is provided at the inner bottom of the outer shell 1. These waters can be recycled for reuse, reducing water resource waste, lowering operating costs, improving water resource utilization efficiency, and by collecting the excess sprayed water, the disorderly flow or overflow of water in the cooling tower can be avoided, maintaining the stability of the internal environment of the cooling tower and ensuring the operating efficiency of the system.

[0034] Furthermore, as Figure 2 shown, at least one drain pipe 10 leading to the inside of the water collecting tank 9 is provided on the outer shell 1, and the drain pipe 10 is externally connected to the input end of the cooling device 11. In this way, the condensed water and excess sprayed water collected in the water collecting tank 9 can be conveyed back to the cooling device 11, and after being cooled down by the cooling device 11, they can be put into secondary use, thereby realizing the recycling of water resources and reducing the consumption of fresh water resources.

[0035] Furthermore, as Figure 1-2 shown, a return pipe 12 is connected between the output end of the cooling device 11 and the cooling pipe 7. By connecting the return pipe 12 between the output end of the cooling device 11 and the cooling pipe 7, the water cooled down by the cooling device 11 is conveyed back to the cooling pipe 7, enabling these waters to be used again by the spraying mechanism 8 for the cooling process, forming a complete water resource circulation loop, thereby reducing the consumption of fresh water resources, improving the utilization efficiency of water resources, and lowering the operating costs of the cooling tower.

[0036] This specific embodiment is only an interpretation of the present invention and is not a limitation thereof. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. Energy-saving dry-wet closed cooling tower, comprising a housing (1), a fan (2) provided at the top of the housing (1), an air inlet (3) provided at the side wall of the housing (1), a heat exchange mechanism (6) and a spraying mechanism (8) provided inside the housing (1), an inlet heat pipe (4) and an outlet cold pipe (5) respectively connected to the inlet and outlet of the heat exchange mechanism (6), and a cooling pipe (7) for supplying cooling water to the spraying mechanism (8), characterized in that: The heat exchange mechanism (6) comprises a plurality of interconnected heat exchange pipes (601), each of the heat exchange pipes (601) is longitudinally folded in an S shape into a multi-layer structure with intervals, and each layer of the heat exchange pipes (601) is wound to form a plurality of loop-shaped structures. The loop-shaped structures on each layer of the heat exchange pipes (601) are longitudinally aligned with each other, so as to form a plurality of longitudinal cylindrical through channels composed of the loop-shaped structures; The spraying mechanism (8) comprises a plurality of spray pipes (801), and a plurality of nozzles (802) are provided on each of the spray pipes (801). Each of the spray pipes (801) is inserted into each of the through channels in one-to-one correspondence.

2. The energy-saving dry-wet closed cooling tower according to claim 1, characterized in that: The inner diameters of the loop-shaped structures constituting the same through channel are arranged in an alternating manner in the longitudinal direction, specifically, the inner diameters of a part of the loop-shaped structures increase in sequence, and the inner diameters of another part of the loop-shaped structures decrease in sequence, and the increase and decrease are arranged alternately.

3. The energy-saving dry-wet closed cooling tower according to claim 1, wherein: A plurality of fins (602) are provided on each of the heat exchange pipes (601).

4. The energy-saving dry-wet closed cooling tower according to claim 3, characterized in that: Each of the fins (602) is arranged in an annular array around each of the through channels, and each of the fins (602) is penetrated by the heat exchange pipe (601).

5. The energy-saving dry-wet closed cooling tower according to claim 1, wherein: A water collecting tank (9) for collecting condensed water and excess sprayed water is provided at the inner bottom of the housing (1).

6. The energy-saving dry-wet closed cooling tower according to claim 5, wherein: At least one drain pipe (10) leading to the water collecting tank (9) is provided on the housing (1), and the drain pipe (10) is externally connected to the input end of a cooling device (11).

7. The energy-saving dry-wet closed cooling tower according to claim 6, characterized in that: A return pipe (12) is connected between the output end of the cooling device (11) and the cooling pipe (7).

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