Spray device, evaporative cooling system, air conditioner and self-cleaning control method

Abstract

The present invention relates to a spray device, an evaporative cooling system, an air conditioner and a self-cleaning control method, and belongs to the technical field of evaporative cooling. The device comprises an air circuit component, a liquid circuit component and a spray component. The spray component is arranged above a heat exchange core. The air circuit component and the liquid circuit component are both connected to the spray component. Two-phase fluid atomization spraying is utilized. The spray component has compressed air in the air circuit component as an assisting force. The spray component cooperates with the water supply pressure of the liquid circuit component to obtain a relatively ideal droplet particle size. Moreover, the arrangement of the air circuit component can improve the droplet velocity and dust reduction efficiency, thereby fully infiltrating, softening and flushing the dirt on the heat exchange core, better realizing the cleaning of the heat exchange core, thereby improving the heat exchange efficiency of the heat exchange core, and ensuring the reliable operation of the evaporative cooling unit.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporative cooling, and in particular to a spray device, an evaporative cooling system, an air conditioner and a self-cleaning control method. Background Art

[0002] With the rapid development of big data centers in China, data centers are typically energy-intensive, with cooling systems accounting for approximately 35% of total electricity costs. Compared to traditional cooling systems, cooling systems using evaporative cooling technology can save over 15% in electricity and 35% in energy. Therefore, in response to the national call for energy conservation, evaporative cooling technology has become a trend.

[0003] Evaporative cooling technology utilizes the principle of heat absorption due to water evaporation, using spray water and unsaturated air as working fluids to exchange heat and moisture in the system, drawing cold energy from natural resources. Compared with traditional mechanical compression refrigeration technology, it is more environmentally friendly, consumes no compression energy, and effectively reduces COP.

[0004] Evaporative cooling can be categorized by technology as direct and indirect. Direct evaporative cooling significantly increases moisture content in the output air due to its direct contact with water, limiting its application. Indirect evaporative cooling, on the other hand, involves isenthalpic humidification and cooling of the working air by contacting water in a wet channel. This process then absorbs heat from the output air in a dry channel, achieving isotropic cooling of the output air.

[0005] However, in indirect evaporative cooling units, it is found that most of the cooling water used in the wet channel comes from natural water sources. During the evaporative cooling process in the wet channel, scale is easily formed on the heat exchange core. This will cause the following effects:

[0006] (1) Reduce the heat exchange effect of the core, reduce the wet bulb efficiency, and the output air outlet temperature cannot meet environmental requirements;

[0007] (2) The resistance of the working air in the wet channel increases, affecting the efficiency of the fan and increasing the noise of the unit;

[0008] (3) The existing descaling methods mostly require manual removal of the core before cleaning and descaling. Since the heat exchange core is large, disassembly and cleaning not only affects the operation of the unit, but also increases the cost of manual maintenance. Summary of the Invention

[0009] In view of this, the purpose of the present invention is to provide a spray device, an evaporative cooling system, an air conditioner and a self-cleaning control method to solve the technical problem in the prior art that scale formed during the evaporative cooling process of an indirect evaporative cooling unit leads to poor core heat exchange effect.

[0010] To achieve the above objectives, the present invention provides the following technical solutions:

[0011] According to a first aspect of an embodiment of the present invention, a spray device is provided, comprising an air circuit assembly, a liquid circuit assembly and a spray assembly, wherein the spray assembly is arranged above a heat exchange core, the air circuit assembly and the liquid circuit assembly are both connected to the spray assembly, and the medium in the air circuit assembly and the liquid circuit assembly can spray atomized droplets through the spray assembly to spray the heat exchange core.

[0012] Furthermore, the gas circuit assembly includes a gas pipeline, an air compressor and an air flow filter component arranged on the gas pipeline, the air inlet of the gas pipeline is connected to the air compressor, and the air outlet of the gas pipeline is connected to the spray assembly.

[0013] Furthermore, the liquid circuit assembly includes a liquid pipeline, a pump structure and a liquid filter component arranged on the liquid pipeline. The liquid inlet of the liquid pipeline is connected to the water supply device through the pump structure, and the liquid outlet of the liquid pipeline is connected to the spray assembly.

[0014] Furthermore, pressure sensors are provided at the outlet of the air compressor and the outlet of the pump structure, and the exhaust pressure at the outlet of the air compressor and the water supply pressure at the outlet of the pump structure can be detected by the pressure sensors at corresponding positions.

[0015] Furthermore, the spray assembly includes at least two spray parts, the gas pipeline includes a gas main pipe and a gas branch pipe, each of the spray parts is connected to the gas main pipe through the corresponding gas branch pipe, and each of the gas branch pipes is provided with a gas flow regulating part; the liquid pipeline includes a liquid main pipe and a liquid branch pipe, each of the spray parts is connected to the liquid main pipe through the corresponding liquid branch pipe, and each of the liquid branch pipes is provided with a liquid flow regulating part.

[0016] Furthermore, the gas main pipe is provided with an air switch valve, and the liquid main pipe is provided with a liquid switch valve.

[0017] According to a second aspect of an embodiment of the present invention, an evaporative cooling system is provided, comprising a fan, a spray device, a heat exchange core and a water supply device arranged from top to bottom, wherein the spray device is the above-mentioned spray device, the water supply device is connected to the spray assembly through the liquid path assembly, and the water supply device can receive the liquid sprayed by the spray assembly and flowing through the heat exchange core.

[0018] Furthermore, the water supply device includes a water collecting tank, the spray assembly can be connected to the water collecting tank through the liquid circuit assembly, the water collecting tank is provided with a drain valve and a water supply valve, a water level control valve is provided in the water collecting tank, the water supply valve is connected to the water source, and the water level control valve is connected to the water supply valve.

[0019] Furthermore, the heat exchange core includes an evaporation heat exchange tube, which is provided with a spray port. The spray assembly can spray into the corresponding evaporation heat exchange tube through the spray port, and an electric heating wire is provided on the periphery of the evaporation heat exchange tube.

[0020] According to a third aspect of an embodiment of the present invention, there is provided an air conditioner comprising the evaporative cooling system.

[0021] According to a fourth aspect of an embodiment of the present invention, a self-cleaning control method is provided, which is implemented using the above-mentioned evaporative cooling system. The self-cleaning control method includes:

[0022] Determine whether the evaporative cooling system needs self-cleaning;

[0023] If so, the spray assembly is controlled to spray the heat exchange core.

[0024] Furthermore, the determining whether the evaporative cooling system needs to be self-cleaned includes:

[0025] Obtaining an operating time of the evaporative cooling system in its evaporative cooling mode;

[0026] determining whether the operating time of the evaporative cooling system in its evaporative cooling mode reaches a set time threshold;

[0027] If the operating time of the evaporative cooling system in its evaporative cooling mode reaches the set time threshold, it is determined that the evaporative cooling system needs to be self-cleaned.

[0028] Furthermore, the determining whether the evaporative cooling system needs to be self-cleaned includes:

[0029] Acquiring the fresh air temperature of the evaporative cooling system in the evaporative cooling mode, and acquiring the air temperature after evaporative cooling in the evaporative cooling system;

[0030] Obtaining a first difference between the fresh air temperature and the air temperature;

[0031] Determining whether the first difference is less than a preset temperature difference;

[0032] If the first difference is less than the preset temperature difference, it is determined that the evaporative cooling system needs to be self-cleaned.

[0033] Furthermore, the determination of whether the evaporative cooling system needs to be self-cleaned is specifically as follows:

[0034] Obtaining an air inlet pressure value of the evaporative cooling system and an air outlet pressure value at a fan of the evaporative cooling system;

[0035] Obtaining a second difference between the air inlet pressure value and the air outlet pressure value;

[0036] Determining whether the second difference is greater than a preset pressure difference value;

[0037] If the second difference is greater than the preset pressure difference, it is determined that the evaporative cooling system needs to be self-cleaned.

[0038] Furthermore, controlling the spray assembly to spray the heat exchange core includes:

[0039] Controlling the spray assembly to spray droplets to soften the dirt on the heat exchange core;

[0040] After softening to a preset time, the spray assembly is controlled to spray atomized droplets to wash away the dirt on the heat exchange core.

[0041] Furthermore, the ratio of the exhaust pressure in the air circuit assembly during the softening process to the water supply pressure in the liquid circuit assembly is a first pressure ratio, and the ratio of the exhaust pressure in the air circuit assembly during the flushing process to the water supply pressure in the liquid circuit assembly is a second pressure ratio, and the first pressure ratio is greater than the second pressure ratio.

[0042] Furthermore, the exhaust pressure is the pressure at the outlet of the air compressor in the air circuit assembly, and the water supply pressure is the pressure at the outlet of the pump structure in the liquid circuit assembly; the ratio of the exhaust pressure to the water supply pressure is changed by adjusting the air compressor frequency and the pump structure head.

[0043] The spray device provided by the present invention utilizes two-phase fluid atomization spraying. Its spray component has the compressed air in the air circuit component as an auxiliary force, and can obtain a more ideal droplet particle size in cooperation with the water supply pressure of the liquid circuit component. Moreover, through the setting of the air circuit component, the droplet velocity and dust reduction efficiency can be improved, so that the dirt on the heat exchange core can be fully infiltrated, softened and flushed, thereby better cleaning the heat exchange core, thereby improving the heat exchange efficiency of the heat exchange core and ensuring the reliable operation of the evaporative cooling unit.

[0044] The preferred technical solution of the present invention can also produce at least the following technical effects:

[0045] By adjusting the air compressor and pump structure with variable frequency, the unit can switch from evaporative cooling mode to automatic cleaning mode, ensuring that the evaporative cooling unit can achieve multiple working modes to meet customer needs. At the same time, it can reduce equipment energy consumption and personnel maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0047] Figure 1 Schematic diagram of the structure of a spray device (a spray part) provided in an embodiment of the present invention;

[0048] Figure 2 1 is a schematic structural diagram of an evaporative cooling system provided by an embodiment of the present invention;

[0049] Figure 3 1 is a schematic structural diagram of an air conditioner provided by an embodiment of the present invention;

[0050] Figure 4 It is a flow chart of the self-cleaning control method provided by an embodiment of the present invention.

[0051] In the figure: 1. Gas pipeline; 110. Gas main pipe; 120. Gas branch pipe; 2. Air compressor; 3. Air flow filter component; 4. Air switch valve; 5. Liquid pipeline; 510. Liquid main pipe; 520. Liquid branch pipe; 6. Pump structure; 7. Liquid filter component; 8. Liquid switch valve; 9. Gas flow regulating unit; 10. Liquid flow regulating unit; 11. Evaporation heat exchange pipe; 12. Water collecting tank; 13. Fan; 14. Water supply valve; 15. Fresh air module; 16. Air supply module; 17. Spray assembly; 18. Electric heating wire. DETAILED DESCRIPTION

[0052] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0053] The present invention provides a spray device, comprising an air circuit assembly, a liquid circuit assembly and a spray assembly 17 , wherein the spray assembly 17 is arranged above a heat exchange core, and both the air circuit assembly and the liquid circuit assembly are connected to the spray assembly 17 .

[0054] The spray device utilizes two-phase fluid (referring to the gas in the gas circuit component and the liquid in the liquid circuit component) for atomization spraying. The spray component 17 has the compressed air in the gas circuit component as an assist, and cooperates with the water supply pressure of the liquid circuit component to obtain a more ideal droplet particle size. Moreover, through the setting of the gas circuit component, the droplet velocity and dust reduction efficiency can be improved, so that the dirt on the heat exchange core can be fully infiltrated, softened and flushed.

[0055] Among them, the gas circuit assembly includes a gas pipeline 1, an air compressor 2 and an airflow filter component 3 arranged on the gas pipeline 1. The air inlet of the gas pipeline 1 is connected to the air compressor 2, and the air outlet of the gas pipeline 1 is connected to the spray assembly 17. The airflow filter component 3 in this embodiment is an air filter. The air compressed by the air compressor 2 is filtered through the airflow filter component 3 and then flows into the inside of the spray assembly 17.

[0056] The liquid circuit assembly includes a liquid pipeline 5, a pump structure 6 and a liquid filter component 7 arranged on the liquid pipeline 5. The liquid inlet of the liquid pipeline 5 is connected to the water supply device through the pump structure 6, and the liquid outlet of the liquid pipeline 5 is connected to the spray assembly 17. The liquid filter component 7 in this embodiment is a liquid filter. The liquid pumped by the pump structure 6 is filtered by the liquid filter component 7 and then flows into the inside of the spray assembly 17.

[0057] The air flow filter component 3 can better filter impurities contained in the air flowing into the spray assembly 17, while the liquid filter component 7 can better filter impurities contained in the liquid flowing into the spray assembly 17, thereby making the liquid sprayed by the spray assembly 17 cleaner. In addition, the liquid filter component 7 provided on the liquid path assembly can also enable the evaporative cooling system to reduce scale generated on the heat exchange core during the evaporative cooling process.

[0058] Furthermore, pressure sensors are provided at the outlet of the air compressor 2 and the outlet of the pump structure 6. In this embodiment, the pressure sensor at the outlet of the air compressor 2 detects the exhaust pressure at the outlet of the air compressor 2, and the pressure sensor at the outlet of the pump structure 6 detects the water supply pressure at the outlet of the pump structure 6. By adjusting the compressor frequency of the air compressor 2 and the water pump head, the exhaust pressure and the water supply pressure can be adjusted to obtain droplets of different particle sizes to meet more needs.

[0059] The spray assembly 17 is used to spray water from the spray port into the evaporative cooling tube of the heat exchange core. The spray assembly 17 includes at least one spray part, and the water spraying direction of the spray part is toward the heat exchange core. Figure 1This is a structural schematic diagram of a spray device including a spray part, wherein a gas pipeline 1 and a liquid pipeline 5 are both connected to the spray part, and an air flow filter component 3, an air switch valve 4 and a gas flow regulating part 9 are provided on the gas pipeline 1, and a liquid filter component 7, a liquid switch valve 8 and a liquid flow regulating part 10 are provided on the liquid pipeline 5.

[0060] When the spray assembly 17 includes two or more spray parts, the gas pipeline 1 includes a gas main pipe 110 and a gas branch pipe 120. The gas main pipe 110 is provided with an air flow filter component 3. The number of gas branch pipes 120 is the same as the number of spray parts. Each spray part is connected to the gas main pipe 110 through a corresponding gas branch pipe 120. Each gas branch pipe 120 is provided with a gas flow regulating part 9; the gas flow regulating part 9 here includes an air regulating valve and an air pressure gauge.

[0061] Correspondingly, the liquid pipeline 5 includes a liquid main pipe 510 and liquid branch pipes 520. The liquid main pipe 510 is provided with a liquid filter 7. The number of liquid branch pipes 520 is the same as the number of spray units. Each spray unit is connected to the liquid main pipe 510 through a corresponding liquid branch pipe 520. Each liquid branch pipe 520 is provided with a liquid flow regulator 10. The liquid flow regulator 10 has a similar structure to the gas flow regulator 9 and includes a hydraulic regulating valve and a liquid pressure gauge. The air and liquid pressure gauges allow for timely monitoring of the pressures within the corresponding gas and liquid branch pipes 120 and 520.

[0062] Furthermore, by providing an air on / off valve 4 on the gas main pipe 110 and a liquid on / off valve 8 on the liquid main pipe 510, the piping arrangement of the spray device can be effectively configured. The air on / off valve 4 controls the flow of compressed air within the gas main pipe 110, while the liquid on / off valve 8 controls the flow of liquid within the liquid main pipe 510. Furthermore, the flow rates of compressed air and liquid flowing into each spray section can be individually adjusted as needed, thereby enabling better control of the liquid spraying pattern of the spray assembly 17.

[0063] The present invention also provides an evaporative cooling system, comprising the spraying device provided by the present invention, such as Figure 2 As shown, the evaporative cooling system includes a fan 13, a spray device, a heat exchange core and a water supply device arranged from top to bottom. Figure 2 The spraying device shown includes a plurality of spraying parts.

[0064] The water supply device is connected to the spray assembly 17 via a fluidic circuit assembly, and the water supply device receives the liquid sprayed by the spray assembly 17 and flowing through the heat exchange core. The water supply device includes a water collection tank 12, and the spray assembly 17 is connected to the water collection tank 12 via a fluidic circuit assembly. The number of spray sections is determined based on the area above the water collection tank 12.

[0065] As a further optimization, the water collection tank 12 is equipped with a drain valve and a water replenishment valve 14. The drain valve drains the water from the water collection tank 12 to prevent it from accumulating for too long and becoming smelly. A water level control valve (a float valve can be used in this embodiment) is installed within the water collection tank 12. The replenishment valve 14 is connected to the water source, and the water level control valve is connected to the replenishment valve 14. The water level control valve detects the water level in the water collection tank 12 and transmits this information to the replenishment valve 14 at all times. The replenishment valve 14 replenishes the water collection tank 12 based on the received water level information to ensure normal operation of the system.

[0066] The heat exchange core in this embodiment includes an evaporative heat exchange tube 11, which is provided with a spray port. The spray assembly 17 can spray into the corresponding evaporative heat exchange tube 11 through the spray port. An electric heating wire 18 is provided on the periphery of the evaporative heat exchange tube 11. The operation of the electric heating wire 18 can dry the heat exchange core to achieve the purpose of sterilization.

[0067] Based on a general inventive concept, an embodiment of the present invention further provides a self-cleaning control method.

[0068] See Figure 4 The self-cleaning control method provided by the present invention is implemented by the evaporative cooling system described in any of the above embodiments, and the self-cleaning control method includes the following steps:

[0069] S31, determining whether the evaporative cooling system needs to be self-cleaned;

[0070] S32: If yes, control the spray assembly 17 to spray the heat exchange core.

[0071] In a specific control process, there are three ways for users to judge whether the evaporative cooling system needs to be self-cleaned:

[0072] The first one is based on the operating time of the indirect evaporative cooling mode; specifically:

[0073] Obtaining the operating time of the evaporative cooling system in its evaporative cooling mode; determining whether the operating time of the evaporative cooling system in its evaporative cooling mode reaches a set time critical value; if the operating time of the evaporative cooling system in its evaporative cooling mode reaches the set time critical value; determining that the evaporative cooling system needs to be self-cleaned.

[0074] The second method is based on the temperature difference between the fresh air working condition and the temperature after the indirect evaporative cooling section. Specifically:

[0075] Obtain the fresh air temperature of the evaporative cooling system in the evaporative cooling mode, and obtain the air temperature after evaporative cooling in the evaporative cooling system; obtain a first difference between the fresh air temperature and the air temperature; determine whether the first difference is less than a preset temperature difference; if the first difference is less than the preset temperature difference; determine that the evaporative cooling system needs to be self-cleaned.

[0076] It should be noted that the fresh air temperature here refers to the air temperature at the air inlet of the fresh air module of the entire unit. A temperature sensor can be installed at the air inlet of the fresh air module 15 of the unit to detect the fresh air temperature. The temperature after evaporative cooling refers to the air temperature after the air entering the unit is evaporatively cooled by the evaporative cooling system. Specifically, a temperature sensor can be installed between the heat exchange core and the cold water coil.

[0077] The third type: According to the pressure difference before and after the indirect evaporative cooling section, specifically:

[0078] Obtain an inlet pressure value of the evaporative cooling system, and obtain an outlet pressure value at the fan 13 of the evaporative cooling system; obtain a second difference between the inlet pressure value and the outlet pressure value; determine whether the second difference is greater than a preset pressure difference value; if the second difference is greater than the preset pressure difference value; determine that the evaporative cooling system needs to be self-cleaned.

[0079] Specifically, you can Figure 2 A pressure sensor is installed at the left air inlet of the evaporative cooling system shown in the figure. The pressure before the indirect evaporative cooling section can be detected by the sensor, which is the air inlet pressure value mentioned here. Figure 2 In the evaporative cooling system shown, a pressure sensor is installed at the upper exhaust side of the fan 13, through which the pressure after the indirect evaporative cooling section can be detected, which is the outlet pressure value mentioned here.

[0080] In order to avoid the unit from mistakenly starting the self-cleaning mode due to other factors, the pressure difference is set as the priority condition, followed by time, and finally temperature difference.

[0081] In a specific control process, controlling the spray assembly 17 to spray the heat exchange core mainly includes:

[0082] Control the spray assembly 17 to spray droplets to soften the dirt on the heat exchange core;

[0083] After softening to a preset time, the spray assembly 17 is controlled to spray atomized droplets to wash away the dirt on the heat exchange core;

[0084] Among them, the ratio of the exhaust pressure in the air circuit assembly during the softening process to the water supply pressure in the liquid circuit assembly is a first pressure ratio, and the ratio of the exhaust pressure in the air circuit assembly during the flushing process to the water supply pressure in the liquid circuit assembly is a second pressure ratio, and the first pressure ratio is greater than the second pressure ratio.

[0085] For ease of understanding, it needs to be further explained that the exhaust pressure is the pressure at the outlet of the air compressor 2 in the air circuit assembly, and the water supply pressure is the pressure at the outlet of the pump structure 6 in the liquid circuit assembly; by adjusting the frequency of the air compressor 2 and the head of the pump structure 6, the ratio of the exhaust pressure to the water supply pressure can be changed.

[0086] In addition, the present invention also provides an air conditioner, Figure 3 A structural diagram of an air conditioner according to an embodiment of the present invention is provided.

[0087] See Figure 3 The air conditioner of this embodiment includes the above-mentioned evaporative cooling system, and may also include a fresh air module 15 and an air supply module 16. The air entering through the fresh air module 15 can be discharged from the air supply module 16 after heat exchange through the evaporative cooling system.

[0088] The air conditioner (unit) has two working modes: evaporative cooling mode and self-cleaning mode.

[0089] Evaporative cooling mode (evaporative cooling heat exchange): open the fresh air valve on the fresh air module 15, the exhaust valve above the fan 13 of the evaporative cooling system, the cold water coil water valve, and the liquid switch valve 8. After all the control valves are opened to the right position, start the fan 13 in the evaporative cooling system and the blower on the air supply module 16. After the startup is completed and the fan 13 works normally, it enters the indirect evaporative cooling mode.

[0090] Self-cleaning Mode: When self-cleaning mode is activated, the fresh air valve and supply air valve are closed, the exhaust port of the indirect evaporative cooling section is opened, the water supply valve 14 and drain valve on the water collection tank 12, and the liquid on-off valve 8 are opened to their maximum openings, and the fan 13 and supply air blower are turned off. Once the air and water valves are in place, the pump mechanism 6 and air compressor 2 are turned on. Once these valves are functioning normally, self-cleaning mode is entered.

[0091] After entering self-cleaning mode, chemicals (such as sodium or ammonium salts of ethylenediaminetetraacetic acid (EDTA) as a cleaning agent) can be added to the water collection tank 12 to enhance scale removal. By adjusting the frequency of the air compressor 2 and the head of the pump structure 6 until the exhaust pressure to water supply pressure ratio is 1:1, the spray section, assisted by compressed air, can achieve a more ideal droplet size even at low water supply pressures. In this case, the droplets are not only evenly distributed within the tube, but also have a higher droplet velocity and dust reduction efficiency than pressure spray. This fully wets and softens the dirt on the inner wall of the heat exchange tube. After a preset time (which can be set to 10 minutes), the head of the pump structure 6 is increased to achieve a 1:3 exhaust pressure to water supply pressure ratio. This increases the water flow rate, and with it the water supply pressure, the droplet size continues to increase, achieving a flushing effect. The flushing water flows into the water collection tank 12 and flows out through the drain valve. Set the total cleaning and descaling time to 35 minutes. After 35 minutes, shut down the air compressor 2 and pump assembly 6, allow the spray assembly to finish spraying, and close the drain valve. If the unit does not need to be started immediately, activate the electric heater 18 to dry and sterilize the heat exchange core for 15 minutes before automatically shutting down. After turning off the cleaning mode, open the water supply valve 14, and use the float valve to detect the water level in the water collection tank 12. After the self-cleaning mode ends, the air conditioner can also be switched to evaporative cooling mode.

[0092] The present invention utilizes variable frequency control to regulate pressure and flow in the air compressor 2 and pump structure 6, allowing the atomized droplets to soften and then clean dirt on the inner surface of the evaporating heat exchange tube 11. This enables automatic cleaning of the air conditioner and efficient switching between heat exchange modes, thereby ensuring efficient heat exchange for the unit. Furthermore, automatic cleaning reduces manual maintenance costs and the time the unit is unable to start normally during manual maintenance.

[0093] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An evaporative cooling system, characterized in that: It includes fans, spray devices, heat exchange cores and water supply devices arranged from top to bottom, including: The spray device includes an air circuit assembly, a liquid circuit assembly, and a spray assembly, wherein the spray assembly is arranged above the heat exchange core, the air circuit assembly and the liquid circuit assembly are both connected to the spray assembly, and the medium in the air circuit assembly and the liquid circuit assembly can spray atomized droplets through the spray assembly to spray the heat exchange core; The water supply device is connected to the spray assembly through the liquid path assembly, and the water supply device can receive the liquid sprayed by the spray assembly and flowing through the heat exchange core; The heat exchange core comprises an evaporation heat exchange tube, and a spray port is provided on the evaporation heat exchange tube. The spray assembly can spray into the corresponding evaporation heat exchange tube through the spray port. The periphery of the evaporation heat exchange tube is provided with an electric heating wire. When the evaporative cooling system is self-cleaning, the spray assembly is controlled to spray droplets to soften the dirt on the heat exchange core; after softening for a preset time, the spray assembly is controlled to spray atomized droplets to flush the dirt on the heat exchange core; the ratio of the exhaust pressure in the air circuit assembly to the water supply pressure in the liquid circuit assembly during the softening process is a first pressure ratio, and the ratio of the exhaust pressure in the air circuit assembly to the water supply pressure in the liquid circuit assembly during the flushing process is a second pressure ratio, and the first pressure ratio is greater than the second pressure ratio.

2. The evaporative cooling system according to claim 1, wherein: The gas circuit assembly includes a gas pipeline, an air compressor, and an air flow filter component arranged on the gas pipeline. The air inlet of the gas pipeline is connected to the air compressor, and the air outlet of the gas pipeline is connected to the spray assembly.

3. The evaporative cooling system according to claim 2, characterized in that The liquid circuit assembly includes a liquid pipeline, a pump structure and a liquid filter component arranged on the liquid pipeline. The liquid inlet of the liquid pipeline is connected to the water supply device through the pump structure, and the liquid outlet of the liquid pipeline is connected to the spray assembly.

4. The evaporative cooling system according to claim 3, characterized in that Pressure sensors are provided at the outlet of the air compressor and the outlet of the pump structure, and the exhaust pressure at the outlet of the air compressor and the water supply pressure at the outlet of the pump structure can be detected by the pressure sensors at corresponding positions.

5. The evaporative cooling system according to claim 3, wherein: The spray assembly includes at least two spray parts, the gas pipeline includes a gas main pipe and a gas branch pipe, each of the spray parts is connected to the gas main pipe through the corresponding gas branch pipe, and each of the gas branch pipes is provided with a gas flow regulating part; the liquid pipeline includes a liquid main pipe and a liquid branch pipe, each of the spray parts is connected to the liquid main pipe through the corresponding liquid branch pipe, and each of the liquid branch pipes is provided with a liquid flow regulating part.

6. The evaporative cooling system according to claim 5, characterized in that The gas main pipe is provided with an air switch valve, and the liquid main pipe is provided with a liquid switch valve.

7. The evaporative cooling system according to claim 1, wherein: The water supply device includes a water collecting tank, the spray assembly can be connected to the water collecting tank through the liquid circuit assembly, the water collecting tank is provided with a drain valve and a water supply valve, a water level control valve is provided in the water collecting tank, the water supply valve is connected to the water source, and the water level control valve is connected to the water supply valve.

8. An air conditioner, characterized in that: The evaporative cooling system comprises the evaporative cooling system according to any one of claims 1 to 7.

9. A self-cleaning control method, characterized in that: The evaporative cooling system according to any one of claims 1 to 7 is used, wherein the self-cleaning control method comprises: Determine whether the evaporative cooling system needs self-cleaning; If so, the spray assembly is controlled to spray the heat exchange core.

10. The self-cleaning control method according to claim 9, characterized in that: The determining whether the evaporative cooling system needs to be self-cleaned includes: Obtaining an operating time of the evaporative cooling system in its evaporative cooling mode; determining whether the operating time of the evaporative cooling system in its evaporative cooling mode reaches a set time threshold; If the operating time of the evaporative cooling system in its evaporative cooling mode reaches the set time threshold, it is determined that the evaporative cooling system needs to be self-cleaned.

11. The self-cleaning control method according to claim 9, characterized in that: The determining whether the evaporative cooling system needs to be self-cleaned includes: Acquiring the fresh air temperature of the evaporative cooling system in the evaporative cooling mode, and acquiring the air temperature after evaporative cooling in the evaporative cooling system; Obtaining a first difference between the fresh air temperature and the air temperature; Determining whether the first difference is less than a preset temperature difference; If the first difference is less than the preset temperature difference, it is determined that the evaporative cooling system needs to be self-cleaned.

12. The self-cleaning control method according to claim 9, characterized in that: The determination of whether the evaporative cooling system needs to be self-cleaned is specifically as follows: Obtaining an air inlet pressure value of the evaporative cooling system and an air outlet pressure value at a fan of the evaporative cooling system; Obtaining a second difference between the air inlet pressure value and the air outlet pressure value; Determining whether the second difference is greater than a preset pressure difference value; If the second difference is greater than the preset pressure difference, it is determined that the evaporative cooling system needs to be self-cleaned.

13. The self-cleaning control method according to claim 9, characterized in that: The controlling the spray assembly to spray the heat exchange core includes: Controlling the spray assembly to spray droplets to soften the dirt on the heat exchange core; After softening to a preset time, the spray assembly is controlled to spray atomized droplets to wash away the dirt on the heat exchange core.

14. The self-cleaning control method according to claim 13, characterized in that: The ratio of the exhaust pressure in the air circuit assembly during the softening process to the water supply pressure in the liquid circuit assembly is a first pressure ratio, and the ratio of the exhaust pressure in the air circuit assembly during the flushing process to the water supply pressure in the liquid circuit assembly is a second pressure ratio, and the first pressure ratio is greater than the second pressure ratio.

15. The self-cleaning control method according to claim 14, characterized in that: The exhaust pressure is the pressure at the outlet of the air compressor in the air circuit assembly, and the water supply pressure is the pressure at the outlet of the pump structure in the liquid circuit assembly; the ratio of the exhaust pressure to the water supply pressure is changed by adjusting the air compressor frequency and the pump structure head.

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