Energy-saving evaporation air cooler

Abstract

The invention relates to the technical field of air-cooled heat exchangers, and discloses an energy-saving evaporative air cooler which comprises an evaporative air cooler shell, an air inlet pipe is communicated with the bottom of the evaporative air cooler shell, a cold water tank, a condenser and a water inlet tank are fixedly mounted at the bottom of the evaporative air cooler shell, a first water inlet pipe is communicated with the water inlet tank, and a second water inlet pipe is communicated with the condenser. According to the invention, a first-stage heat insulation barrier is formed through the conical heat insulation plate, unevaporated moisture of a wet film is guided to drop to the surface of the heat insulation plate in cooperation with the cavity and the through holes, auxiliary heat dissipation of the motor is realized by means of moisture evaporation, and a dual heat insulation and heat dissipation system is formed; the water evaporation speed of the first wet film is effectively slowed down, sufficient air humidifying and cooling efficiency is guaranteed, the water supplementing frequency of the atomizing nozzle is reduced, the service life of the wet film is prolonged, and the maintenance cost and energy consumption are reduced.

Description

Technical Field

[0001] This invention relates to the field of air-cooled heat exchanger technology, and specifically to an energy-saving evaporative air cooler. Background Technology

[0002] Generally speaking, an energy-saving evaporative air cooler is a heat exchange device used in industrial production, refrigeration systems and other fields. It achieves heat exchange through the contact evaporation of a wet film with air, utilizing the latent heat of water to remove heat from the air, thereby achieving a cooling effect. During the evaporative cooling process, a fan is needed to continuously deliver the dry air to be cooled to the surface of the wet film, so that the dry air and the wet film can be in full contact. The evaporation of moisture from the wet film achieves air cooling and humidification, ensuring the stable operation of the subsequent heat exchange system.

[0003] In practical applications, existing devices inevitably generate heat during fan operation. This heat, along with the airflow delivered by the fan, acts on the wet film surface. Since the evaporation rate of the wet film is closely related to the ambient temperature, the additional heat generated by the fan accelerates the evaporation rate of the wet film surface, causing the wet film to dry rapidly. Excessive drying of the wet film directly leads to a decrease in the humidification effect on the dry air. On the one hand, the amount of water available for evaporation on the wet film surface is reduced, making it impossible for the air to fully absorb moisture when in contact with the wet film. This not only reduces the humidity of the air but also reduces the cooling efficiency due to insufficient evaporation, failing to achieve the expected cooling effect. On the other hand, the accelerated drying speed of the wet film requires frequent replenishment of water, causing the wet film to be in a state of rapid drying and wetting for a long time. This may also shorten its service life and increase the maintenance cost of the equipment. Based on this, the present invention aims to provide an energy-saving evaporative air cooler that can suppress the impact of fan heat on the drying of the wet film, improve the humidification cooling effect and operational stability. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an energy-saving evaporative air cooler to solve the technical problems in the prior art.

[0005] The objective of this invention can be achieved through the following technical solutions: An energy-saving evaporative air cooler includes: An evaporative air cooler housing has an air inlet pipe connected to its bottom. A cold water tank, a condenser, and a water inlet tank are fixedly installed at the bottom of the evaporative air cooler housing. A first water inlet pipe is connected to the water inlet tank, and a first water outlet pipe is connected to the cold water tank. The water inlet tank is connected to the cold water tank through the condenser. A first wet film is fixedly installed inside the air inlet pipe, and the radius of the first wet film increases upward along its axis. The bottom of the air inlet pipe is open. A bearing bracket is fixedly installed at the bottom of the air inlet pipe, and a servo motor is fixedly installed at the bottom of the bearing bracket. A rotating rod is rotatably installed on the bearing bracket, and the rotating rod is driven to rotate by the servo motor. An annular pipe is fixedly installed on the inner wall of the air inlet pipe. The annular pipe is located between the bearing bracket and the fan blade. The inner ring of the annular pipe is connected to multiple equally spaced branch pipes, and multiple equally spaced atomizing nozzles are fixedly installed on each branch pipe. The atomizing nozzles face the bottom of the fan blade. The outer ring of the annular pipe is connected to a connecting pipe, which passes through the air inlet pipe and is connected to the first water outlet pipe. A conical heat insulation plate is fixedly installed on the top of the bearing frame, and the conical heat insulation plate is sleeved on the outer circular surface of the rotating rod, and the conical heat insulation plate is rotatably connected to the rotating rod; The cavity is located at the top of the rotating rod, with the bottom end of the first wet film above the cavity. A through hole is provided on the outer circumference of the bottom end of the rotating rod, with the outlet of the through hole located above the conical heat insulation plate. The cavity extends downward and communicates with the through hole.

[0006] As a further embodiment of the present invention: a precooling pipe is fixedly installed at the bottom of the air inlet pipe, a slot matching the bearing bracket is opened at the top of the precooling pipe, the bottom of the precooling pipe is open, a heat absorption pipe is fixedly connected inside the precooling pipe, both ends of the heat absorption pipe pass through the precooling pipe, and the water inlet of the heat absorption pipe is connected to the cold water tank through the second water outlet pipe, and the water outlet of the heat absorption pipe is connected to the water inlet tank through the second water inlet pipe.

[0007] As a further aspect of the present invention, a detachable filter screen is provided at the bottom of the precooling pipe.

[0008] As a further aspect of the present invention: a guide rod is fixedly installed at the bottom of the first wet film, the guide rod is coaxially arranged with the rotating rod, and the bottom end of the guide rod extends into the cavity.

[0009] As a further aspect of the present invention: a groove is provided in the through hole, the groove is located below the connection between the through hole and the cavity, and two symmetrically arranged gates are slidably installed in the groove. The side of each gate that is far away from each other is connected to the groove by a spring. The preload of the spring causes the two gates to move closer together to block the through hole. When the servo motor drives the rotating rod to rotate at high speed, the centrifugal force causes the two gates to move away from each other, at which time the gates compress the spring.

[0010] As a further aspect of the present invention: a counterweight is fixedly installed on each of the two gates on the side away from each other, and the counterweight is away from the axis of the rotating rod.

[0011] As a further aspect of the present invention: a throttling block is fixedly installed at the connection between the cavity and the through hole, and the throttling block has multiple throttling holes.

[0012] As a further aspect of the present invention: a connecting plate is fixedly installed at the edge of the conical heat insulation plate, and a second wet film is fixedly installed on the connecting plate. The radius of the second wet film increases upward along its axis. There is a gap between the bottom end of the second wet film and the outer circular surface of the rotating rod, and the bottom end of the second wet film is located above the top end of the conical heat insulation plate. The radius of the conical heat insulation plate decreases upward along its axis. An annular baffle is fixedly installed at the top edge of the second wet film. The horizontal height of the through hole outlet is not higher than the horizontal height of the annular baffle.

[0013] The beneficial effects of this invention are: 1. In this invention, a primary heat insulation barrier is formed by a conical heat insulation plate, and the cavity and through holes guide the unevaporated water of the wet film to drip onto the surface of the heat insulation plate. The evaporation of water helps to achieve motor-assisted heat dissipation, forming a dual heat insulation and heat dissipation system. This effectively slows down the evaporation rate of the first wet film, ensuring sufficient air humidification and cooling efficiency, reducing the frequency of water replenishment for the atomizing nozzles, extending the service life of the wet film, and reducing maintenance costs and energy consumption. 2. In this invention, a circulation loop is formed by the heat absorption tube in the precooling tube, the cold water tank, and the inlet water tank. Low-temperature cold water is used to precool and reduce the temperature of the intake air and increase its humidity, which is adapted to the evaporative cooling requirements of the first wet film. This solves the problem of excessively fast evaporation and insufficient humidification when the dry air comes into contact with the wet film in the existing device. At the same time, the heat absorption tube absorbs part of the heat from the motor to achieve heat recovery and utilization, without affecting the cooling effect of the circulating water, further enhancing energy saving and cooling efficiency. 3. In this invention, a speed-linked through-hole control structure is formed by grooves, gates, springs and counterweights. Combined with a throttling block, it achieves precise control of water dripping. When the motor is running at low speed, the through-hole is blocked to store water. When generating heat at high speed, the opening size is adjusted according to the speed, and water is added and heat is dissipated as needed to meet dynamic heat dissipation requirements. At the same time, the second wet film, together with the conical heat insulation plate and the annular baffle, forms a two-stage heat dissipation and insulation system, which effectively blocks the heat penetration of the motor and ensures the stable wet state of the wet film and the safe operation of the equipment. Attached Figure Description

[0014] The invention will now be further described with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure in this invention; Figure 3 This is a schematic diagram of the structure in this invention; Figure 4 This is a schematic diagram of the structure in this invention; Figure 5 This is a schematic diagram of the structure in this invention.

[0016] In the diagram: 1. Evaporative air cooler shell; 2. Inlet pipe; 3. Cold water tank; 301. First outlet pipe; 302. Second outlet pipe; 4. Condenser; 5. Inlet tank; 501. First inlet pipe; 502. Second inlet pipe; 6. First wet film; 601. Guide rod; 7. Bearing bracket; 8. Rotating rod; 9. Fan blade; 10. Servo motor; 11. Annular pipe; 1101. Connecting pipe; 12. Branch pipe; 1201. Atomizing nozzle; 13. Cavity; 14. Through hole; 15. Groove; 16. Gate plate; 17. Spring; 18. Counterweight; 19. Throttling block; 20. Throttling orifice; 21. Conical heat insulation plate; 22. Connecting plate; 23. Second wet film; 24. Pre-cooling pipe; 2401. Slot; 25. Heat absorption pipe; 26. Filter screen; 27. Annular baffle. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-5 As shown, the present invention is an energy-saving evaporative air cooler, comprising: An evaporative air cooler housing 1 has an air inlet pipe 2 connected to its bottom. A cold water tank 3, a condenser 4, and a water inlet tank 5 are fixedly installed at the bottom of the evaporative air cooler housing 1. A first water inlet pipe 501 is connected to the water inlet tank 5, and a first water outlet pipe 301 is connected to the cold water tank 3. The water inlet tank 5 is connected to the cold water tank 3 through the condenser 4. A first wet film 6 is fixedly installed inside the air inlet pipe 2. The radius of the first wet film 6 increases upward along its axis. The bottom of the air inlet pipe 2 is open. A bearing bracket 7 is fixedly installed at the bottom of the air inlet pipe 2. A servo motor 10 is fixedly installed at the bottom of the bearing bracket 7. A rotating rod 8 is rotatably installed on the bearing bracket 7. The rotating rod 8 is driven to rotate by the servo motor 10. An annular pipe 11 is fixedly installed on the inner wall of the air inlet pipe 2. The annular pipe 11 is located between the bearing bracket 7 and the fan blade 9. The inner ring of the annular pipe 11 is connected to multiple equally spaced branch pipes 12, and each branch pipe 12 is fixedly installed with multiple equally spaced atomizing nozzles 1201. The atomizing nozzles 1201 face the bottom of the fan blade 9. The outer ring of the annular pipe 11 is connected to a connecting pipe 1101, which passes through the air inlet pipe 2 and is connected to the first water outlet pipe 301. A conical heat insulation plate 21 is fixedly installed on the top of the bearing frame 7, and the conical heat insulation plate 21 is sleeved on the outer circular surface of the rotating rod 8, and the conical heat insulation plate 21 is rotatably connected to the rotating rod 8; Cavity 13 is formed at the top of rotating rod 8. The bottom end of the first wet film 6 is located above cavity 13. A through hole 14 is formed on the outer circular surface of the bottom end of rotating rod 8. The outlet of the through hole 14 is located above conical heat insulation plate 21. Cavity 13 extends downward and communicates with through hole 14.

[0019] The working principle of this invention is as follows: During normal operation, the first water inlet pipe 501 injects water into the water inlet tank 5. After being cooled by the condenser 4, the water flows into the cold water tank 3 for storage, realizing the pre-cooling of the circulating water and providing a low-temperature water source for wet film humidification and equipment heat dissipation, thereby reducing energy consumption. The cold water in the cold water tank 3 is transported to the ring pipe 11 through the first water outlet pipe 301 and the connecting pipe 1101. After being atomized by the atomizing nozzle 1201 on the branch pipe 12, it is evenly sprayed onto the surface of the first wet film 6, keeping the first wet film 6 moist. When the servo motor 10 is started, its output shaft drives the rotating rod 8 to rotate. The fan blade 9 at the top of the rotating rod 8 rotates synchronously, generating negative pressure to draw in the external air to be cooled and dried through the air inlet pipe 2. As the airflow flows upward, it comes into full contact with the moist first wet film 6. The water on the surface of the first wet film 6 evaporates and absorbs heat, thus cooling and humidifying the air. The humidified low-temperature air enters the evaporative air cooler shell 1 and completes heat exchange with the subsequent heat exchange system to ensure stable system operation. To address the heat generation issue of the servo motor 10, a primary heat insulation barrier is first formed by the conical heat insulation plate 21, directly blocking most of the heat from diffusing upwards to the first wet film 6 area, thus preventing the heat from accelerating the evaporation of moisture on the surface of the first wet film 6. Simultaneously, the unevaporated moisture on the surface of the first wet film 6 accumulates at the bottom due to gravity, flows downwards along the cavity 13 at the top of the rotating rod 8, and drips onto the surface of the conical heat insulation plate 21 through the through hole 14. The moistened conical heat insulation plate 21 carries away its own and surrounding heat through moisture evaporation, achieving auxiliary heat dissipation for the servo motor 10, further reducing the ambient temperature around the motor, and reducing heat penetration into the first wet film 6 area. Through this design, the evaporation rate of moisture in the first wet film 6 is effectively slowed down, preventing the wet film from drying out quickly. This ensures sufficient humidification when the air comes into contact with the wet film, improving cooling efficiency, while also reducing the water replenishment frequency of the atomizing nozzle 1201, avoiding long-term alternating wet and dry conditions of the wet film, extending its service life, and reducing maintenance costs.

[0020] like Figures 1-2 As shown, in a preferred embodiment of the present invention, a precooling pipe 24 is fixedly installed at the bottom of the air inlet pipe 2. The top of the precooling pipe 24 is provided with a slot 2401 that matches the bearing bracket 7. The bottom of the precooling pipe 24 is open. A heat absorption pipe 25 is fixedly connected inside the precooling pipe 24. Both ends of the heat absorption pipe 25 pass through the precooling pipe 24. The water inlet of the heat absorption pipe 25 is connected to the cold water tank 3 through the second water outlet pipe 302, and the water outlet of the heat absorption pipe 25 is connected to the water inlet tank 5 through the second water inlet pipe 502.

[0021] In practical application, the low-temperature cold water in the cold water tank 3 flows into the heat absorption pipe 25 through the second water outlet pipe 302. After the cooling air enters from the bottom opening of the pre-cooling pipe 24, it first contacts the surface of the heat absorption pipe 25. The low-temperature cold water in the cold pipe exchanges heat with the air to pre-cool the air and increase the relative humidity of the air. When the pre-cooled air enters the air inlet pipe 2 and contacts the first wet film 6, the initial temperature is lower and the humidity is higher, which can effectively reduce the evaporation rate of the moisture in the first wet film 6, avoid the wet film from drying quickly, and improve the efficiency of subsequent evaporative cooling. This solves the problem of excessively fast evaporation and insufficient humidification when dry air comes into contact with the wet film in the existing device. Meanwhile, the heat absorption pipe 25 is located near the bottom of the servo motor 10, which can absorb some of the heat emitted by the motor and achieve auxiliary heat dissipation for the motor. The cold water in the cold pipe only exchanges heat with the air, and the temperature rise is small, remaining below room temperature. After flowing back to the water tank 5 through the second water inlet pipe 502, it mixes with the newly added water source, and is then cooled by the condenser 4 before being recycled. This does not affect the cooling effect of the circulating water and also achieves heat recovery and utilization.

[0022] like Figures 1-2As shown, in a preferred embodiment of the present invention, the bottom of the precooling pipe 24 is provided with a detachably connected filter screen 26.

[0023] In practical applications, this embodiment uses filter screen 26 to intercept dust, impurities and other particulate matter in the air, preventing impurities from entering the air intake pipe 2 with the airflow and adhering to the surface of the first wet film 6, thus preventing the wet film pores from becoming clogged. Furthermore, filter screen 26 can be disassembled, replaced and cleaned.

[0024] like Figures 1-2 As shown, in a preferred embodiment of the present invention, a guide rod 601 is fixedly installed at the bottom of the first wet film 6. The guide rod 601 is coaxially arranged with the rotating rod 8, and the bottom end of the guide rod 601 extends into the cavity 13.

[0025] In practical application, the water accumulated on the surface of the first wet film 6 will flow downward along the surface of the guide rod 601, preventing water from dripping randomly onto the inner wall of the air inlet pipe 2 and causing waste. At the same time, the guide rod 601 accurately guides the water into the cavity 13 of the rotating rod 8, avoiding the problem of water dripping and scattering and inefficiency.

[0026] like Figures 1-5 As shown, in a preferred embodiment of the present invention, a groove 15 is provided in the through hole 14. The groove 15 is located below the connection between the through hole 14 and the cavity 13. Two symmetrically arranged gate plates 16 are slidably installed in the groove 15. Each gate plate 16 is connected to the groove 15 by a spring 17 on the side away from each other. The preload of the spring 17 causes the two gate plates 16 to move closer to block the through hole 14. When the servo motor 10 drives the rotating rod 8 to rotate at high speed, the centrifugal force causes the two gate plates 16 to move away from each other. At this time, the gate plates 16 compress the spring 17.

[0027] Specifically, a counterweight 18 is fixedly installed on each of the two gate plates 16 on the side away from each other, and the counterweight 18 is away from the axis of the rotating rod 8.

[0028] Specifically, a throttling block 19 is fixedly installed at the connection between the cavity 13 and the through hole 14, and the throttling block 19 has multiple throttling holes 20.

[0029] In practical application, the rotational speed of the servo motor 10 is directly related to the moisture evaporation requirement of the first wet film 6. When the first wet film 6 has sufficient humidity, it can achieve full humidification without high-speed airflow. The servo motor 10 maintains constant low-speed operation, driving the fan blade 9 to smoothly deliver airflow. At this time, the motor generates less heat, and the preload of the spring 17 is greater than the centrifugal force on the gate 16. The two gates 16 move closer to each other to block the through hole 14. The moisture dripping from the first wet film 6 into the cavity 13 is temporarily stored to avoid unnecessary loss. At the same time, the basic heat insulation function of the conical heat insulation plate 21 can meet the requirements. When the humidity of the first wet film 6 decreases and the humidification effect needs to be enhanced, the spray volume of the atomizing nozzle 1201 needs to be increased. At the same time, the servo motor 10 is started to accelerate, driving the fan blade 9 to generate a stronger airflow, so that the atomized water vapor is evenly dispersed on the surface of the first wet film 6. At this time, the motor speed increases and the heat generation increases significantly, and the heat accelerates the drying of the wet film. As the rotation speed of the rotating rod 8 increases, the centrifugal force on the counterweight 18 on the gate plate 16 increases. When the centrifugal force exceeds the preload of the spring 17, the two gate plates 16 move away from each other, the through hole 14 opens, and the water stored in the cavity 13 is limited by the throttling hole 20 of the throttling block 19 and then drips evenly onto the surface of the conical heat insulation plate 21. The size of the opening of the gate plate 16 is proportional to the rotation speed of the rotating rod 8. The faster the motor speed, the more heat is generated, the larger the opening, the more water drips, and the stronger the heat dissipation effect of the conical heat insulation plate 21, which precisely suppresses the heat diffusion. The throttling block 19 prevents water from rushing out instantly after the through hole 14 is opened, ensuring that water is evenly distributed along the conical heat insulation plate 21, making full use of water evaporation for heat dissipation, while preventing excessive water from dripping onto the motor surface and causing malfunctions. This achieves a balance between heat dissipation and safety, further solving the problem of dynamic adjustment of motor heat generation with load changes and heat dissipation requirements, and continuously ensuring the stable humid state of the first wet film 6.

[0030] like Figures 1-5 As shown, in a preferred embodiment of the present invention, a connecting plate 22 is fixedly installed at the edge of the conical heat insulation plate 21, and a second wet film 23 is fixedly installed on the connecting plate 22. The radius of the second wet film 23 increases upward along its axis. There is a gap between the bottom end of the second wet film 23 and the outer circular surface of the rotating rod 8, and the bottom end of the second wet film 23 is located above the top end of the conical heat insulation plate 21. The radius of the conical heat insulation plate 21 decreases upward along its axis. An annular baffle 27 is fixedly installed at the top edge of the second wet film 23. The horizontal height of the outlet of the through hole 14 is not higher than the horizontal height of the annular baffle 27.

[0031] In practical application, the water dripping from the through-hole 14 is blocked by the annular baffle 27 and cannot overflow. Instead, it drips onto the surface of the second wet film 23, keeping the second wet film 23 moist. The radius of the second wet film 23 increases upward along the axis, which is compatible with the inclined structure of the conical heat insulation plate 21. This increases the contact area with the heat from the motor, and the evaporation of water further absorbs the heat emitted by the motor, forming a two-stage heat dissipation and insulation system of physical barrier and evaporative heat absorption. Compared with a single insulation structure, this system can more effectively reduce the penetration of heat from the servo motor 10 into the area of ​​the first wet film 6.

[0032] Meanwhile, the water on the surface of the second wet film 23 will drip down the inclined surface onto the conical heat insulation plate 21 under the action of gravity, and then use the water to evaporate and dissipate heat again, avoiding water waste; the structure of the conical heat insulation plate 21 with the radius decreasing upward can guide the water to flow to the edge, ensuring that the entire surface of the heat insulation plate can be covered with water, thus ensuring uniform heat dissipation.

[0033] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. An energy-saving evaporative air cooler, characterized in that, include: An evaporative air cooler housing (1) is provided with an air inlet pipe (2) at the bottom. A cold water tank (3), a condenser (4), and a water inlet tank (5) are fixedly installed at the bottom of the evaporative air cooler housing (1). A first water inlet pipe (501) is connected to the water inlet tank (5). A first water outlet pipe (301) is connected to the cold water tank (3). The water inlet tank (5) is connected to the cold water tank (3) through the condenser (4). A first wet film (6) is fixedly installed inside the air inlet pipe (2). The radius of the first wet film (6) increases upward along its axis. The bottom of the air inlet pipe (2) is open. A bearing bracket (7) is fixedly installed at the bottom of the air inlet pipe (2). A servo motor (10) is fixedly installed at the bottom of the bearing bracket (7). A rotating rod (8) is rotatably installed on the bearing bracket (7). The rotating rod (8) is driven to rotate by the servo motor (10). An annular pipe (11) is fixedly installed on the inner wall of the air inlet pipe (2). The annular pipe (11) is located between the bearing frame (7) and the fan blade (9). The inner ring of the annular pipe (11) is connected to multiple equally spaced branch pipes (12), and each branch pipe (12) is fixedly installed with multiple equally spaced atomizing nozzles (1201). The atomizing nozzles (1201) face the bottom of the fan blade (9). The outer ring of the annular pipe (11) is connected to a connecting pipe (1101). The connecting pipe (1101) passes through the air inlet pipe (2) and is connected to the first water outlet pipe (301). A conical heat insulation plate (21) is fixedly installed on the top of the bearing frame (7), and the conical heat insulation plate (21) is sleeved on the outer circle of the rotating rod (8), and the conical heat insulation plate (21) is rotatably connected to the rotating rod (8); A cavity (13) is formed at the top of the rotating rod (8). The bottom end of the first wet film (6) is located above the cavity (13). A through hole (14) is formed on the outer circular surface of the bottom end of the rotating rod (8). The outlet of the through hole (14) is located above the conical heat insulation plate (21). The cavity (13) extends downward and communicates with the through hole (14).

2. The energy-saving evaporative air cooler according to claim 1, characterized in that, The air inlet pipe (2) is fixedly installed with a precooling pipe (24) at the bottom. The top of the precooling pipe (24) is provided with a slot (2401) that matches the bearing bracket (7). The bottom of the precooling pipe (24) is open. A heat absorption pipe (25) is fixedly connected inside the precooling pipe (24). Both ends of the heat absorption pipe (25) pass through the precooling pipe (24). The water inlet of the heat absorption pipe (25) is connected to the cold water tank (3) through the second water outlet pipe (302). The water outlet of the heat absorption pipe (25) is connected to the water inlet tank (5) through the second water inlet pipe (502).

3. An energy-saving evaporative air cooler according to claim 2, characterized in that, The bottom of the precooling pipe (24) is provided with a detachable filter screen (26).

4. An energy-saving evaporative air cooler according to claim 1, characterized in that, A guide rod (601) is fixedly installed at the bottom of the first wet film (6). The guide rod (601) is coaxially arranged with the rotating rod (8), and the bottom end of the guide rod (601) extends into the cavity (13).

5. An energy-saving evaporative air cooler according to claim 2, characterized in that, A groove (15) is provided in the through hole (14). The groove (15) is located below the connection between the through hole (14) and the cavity (13). Two symmetrically arranged gate plates (16) are slidably installed in the groove (15). The side of each gate plate (16) that is far away from each other is connected to the groove (15) by a spring (17). The preload of the spring (17) causes the two gate plates (16) to move closer to block the through hole (14). When the servo motor (10) drives the rotating rod (8) to rotate at high speed, the centrifugal force causes the two gate plates (16) to move away from each other. At this time, the gate plate (16) compresses the spring (17).

6. An energy-saving evaporative air cooler according to claim 5, characterized in that, A counterweight (18) is fixedly installed on each of the two gates (16) on the side away from each other, and the counterweight (18) is away from the axis of the rotating rod (8).

7. An energy-saving evaporative air cooler according to claim 6, characterized in that, A throttling block (19) is fixedly installed at the connection between the cavity (13) and the through hole (14), and the throttling block (19) has multiple throttling holes (20).

8. An energy-saving evaporative air cooler according to claim 1, characterized in that, A connecting plate (22) is fixedly installed at the edge of the conical heat insulation plate (21). A second wet membrane (23) is fixedly installed on the connecting plate (22). The radius of the second wet membrane (23) increases upward along its axis. There is a gap between the bottom end of the second wet membrane (23) and the outer surface of the rotating rod (8). The bottom end of the second wet membrane (23) is located above the top of the conical heat insulation plate (21). The radius of the conical heat insulation plate (21) decreases upward along its axis. An annular baffle (27) is fixedly installed at the top edge of the second wet membrane (23). The horizontal height of the outlet of the through hole (14) is not higher than the horizontal height of the annular baffle (27).

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