Drainage control methods for air conditioning spray outdoor units, air conditioning spray outdoor units

Abstract

This application relates to the field of air conditioning equipment technology, specifically to a drainage control method for an air conditioning spray outdoor unit and an air conditioning spray outdoor unit. The air conditioning spray outdoor unit includes a first solenoid valve, a water pump, a pressure sensor, a second solenoid valve, a third solenoid valve, an outdoor unit body, and a temperature sensor. The control method includes: acquiring a preset drainage temperature and the actual ambient temperature, and controlling the opening and closing of the first solenoid valve based on the magnitude of the two; when the first solenoid valve is closed, opening the second and third solenoid valves to perform the first drainage process; after a first preset time, acquiring the first outlet pressure before the water pump is turned on, and turning on the water pump to perform the second drainage process; acquiring the preset outlet pressure difference of the water pump, and after running for a second preset time, acquiring the second outlet pressure to obtain the first outlet pressure difference, and controlling the opening and closing of the water pump, the drainage system, and the third solenoid valve based on the magnitude of the actual and preset pressure difference. This application can achieve automatic drainage of the air conditioning spray outdoor unit, and the drainage is more thorough.

Description

Technical Field

[0001] This application relates to the field of air conditioning equipment technology, specifically to a drainage control method for an air conditioning spray outdoor unit and an air conditioning spray outdoor unit. Background Technology

[0002] With the rapid development of the Internet and the Internet of Things, the demand for information and data processing has risen sharply. The cooling energy consumption required by data processing centers to process data continues to increase. For how to reduce the cooling energy consumption of data centers to reduce cooling costs, air conditioning spray outdoor units have strong relevance and good market application prospects in energy-saving projects.

[0003] The outdoor unit of the air conditioner spray system is connected to the condenser of the air conditioning system through system piping. In actual use, the design of the system piping and nozzles, as well as the selection of the water pump, maximize the spray area. When the spray evaporates, it absorbs heat, which can reduce the ambient temperature of the outdoor unit of the air conditioning system. The condenser can more easily transfer heat to the surrounding environment, thereby improving the heat exchange efficiency of the condenser and reducing the energy consumption of the air conditioner.

[0004] In the process of developing this application, the inventors discovered at least the following technical problems in the prior art:

[0005] The use of air conditioning spray outdoor units is seasonal. When the outdoor temperature is close to the freezing temperature of the water in the system pipes, in order to prevent the system pipes from freezing and cracking, manual maintenance is required to drain and purge the system pipes of the air conditioning spray outdoor unit. The above drainage process is labor-intensive and may result in incomplete drainage. Summary of the Invention

[0006] In view of this, this application provides a drainage control method and an air conditioning spray outdoor unit, which can realize automatic drainage of the air conditioning spray outdoor unit and the drainage is more thorough.

[0007] In a first aspect, this application provides a drainage control method for an air conditioning spray outdoor unit, wherein the air conditioning spray outdoor unit includes a first solenoid valve, a water pump, a pressure sensor, a second solenoid valve, a third solenoid valve, an outdoor unit body, and a temperature sensor connected in sequence; the drainage control method for the air conditioning spray outdoor unit includes:

[0008] The preset drainage temperature and the actual ambient temperature are obtained, and the opening and closing of the first solenoid valve are controlled according to the relationship between the actual ambient temperature and the preset drainage temperature.

[0009] With the first solenoid valve closed, the second and third solenoid valves are opened to perform the first drainage.

[0010] After the second solenoid valve and the third solenoid valve have been running for a first preset time, the first outlet pressure before the water pump is turned on is obtained, and the water pump is turned on to perform the second drainage.

[0011] The preset outlet pressure difference of the water pump is obtained. After the water pump has been running for a second preset time, the second outlet pressure after the water pump is turned on is obtained. The first outlet pressure difference between the first outlet pressure and the second outlet pressure is obtained. The opening and closing of the water pump, the second solenoid valve and the third solenoid valve are controlled according to the magnitude of the preset outlet pressure difference and the first outlet pressure difference.

[0012] In some embodiments, the opening and closing of the first solenoid valve is controlled based on the magnitude of the actual ambient temperature and the preset drainage temperature; including:

[0013] Determine whether the actual ambient temperature is greater than the preset drainage temperature;

[0014] If the actual ambient temperature is greater than the preset drainage temperature, the first solenoid valve remains open.

[0015] If the actual ambient temperature is less than or equal to the preset drainage temperature, the first solenoid valve is closed.

[0016] In some embodiments, the opening and closing of the water pump, the second solenoid valve, and the third solenoid valve are controlled according to the magnitude of the preset outlet pressure difference and the first outlet pressure difference; including:

[0017] Determine whether the first outlet pressure difference is greater than the preset outlet pressure difference;

[0018] If the first outlet pressure difference is greater than or equal to the preset outlet pressure difference, the water pump is restarted after the third preset time and runs for the second preset time to perform the third drainage process.

[0019] If the first outlet pressure difference is less than the preset outlet pressure difference, close the second solenoid valve and the third solenoid valve.

[0020] In some implementations, if the first outlet pressure difference is less than the preset outlet pressure difference, after closing the second and third solenoid valves, a second operation process is also included:

[0021] After closing the second solenoid valve and the third solenoid valve and maintaining this position for a fourth preset time, with the first solenoid valve closed, the second solenoid valve and the third solenoid valve are opened to perform the fourth drainage process.

[0022] After the second solenoid valve and the third solenoid valve have been running for a first preset time, the third outlet pressure before the water pump is turned on is obtained, and the water pump is turned on to perform the fifth drainage process.

[0023] After the water pump has been running for a second preset time, the fourth outlet pressure after the water pump is turned on is obtained, and the second outlet pressure difference between the third outlet pressure and the fourth outlet pressure is obtained. The opening and closing of the water pump, the second solenoid valve and the third solenoid valve are controlled according to the magnitude of the preset outlet pressure difference and the second outlet pressure difference.

[0024] In some embodiments, the opening and closing of the water pump, the second solenoid valve, and the third solenoid valve are controlled according to the magnitude of the preset outlet pressure difference and the second outlet pressure difference; including:

[0025] Determine whether the second outlet pressure difference is greater than the preset outlet pressure difference;

[0026] If the second outlet pressure difference is greater than or equal to the preset outlet pressure difference, the water pump is restarted after the third preset time and runs for the second preset time to perform the sixth drainage process.

[0027] If the second outlet pressure difference is less than the preset outlet pressure difference, the second solenoid valve and the third solenoid valve are closed to complete the automatic drainage process of the air conditioner spray outdoor unit.

[0028] In some implementations, the first preset time is 25 min to 35 min.

[0029] In some implementations, the second preset time is 3s to 7s.

[0030] In some implementations, the third preset time is 5h to 7h.

[0031] In some implementations, the fourth preset time is 23h to 25h.

[0032] Secondly, an air conditioning spray outdoor unit, wherein the air conditioning spray outdoor unit adopts the drainage control method of the air conditioning spray outdoor unit described in any of the above embodiments.

[0033] By adopting the above technical solution, this application has at least the following beneficial effects:

[0034] The drainage control method for an air conditioning spray outdoor unit provided in this application involves opening the second and third solenoid valves to discharge most of the water when the ambient temperature is lower than the drainage temperature. Then, by activating the water pump, the water pump, along with the second and third solenoid valves, works together to discharge some residual water. Finally, the residual water level is determined by comparing the preset outlet pressure difference with the first outlet pressure difference. If the requirement is not met, the drainage process continues. In other words, the drainage control method for the air conditioning spray outdoor unit of this application employs a dual drainage method: automatic drainage by opening the second and third solenoid valves, and forced drainage by activating the water pump. It also determines whether drainage is complete based on the outlet pressure difference after drainage, thus determining whether an enhanced drainage step is needed. This automated drainage method ensures thorough drainage while reducing workload and effectively lowering labor maintenance costs. Attached Figure Description

[0035] Figure 1 The schematic diagram of the air conditioning spray outdoor unit provided in this application;

[0036] Figure 2 A logic diagram of the drainage control method for the air conditioning spray outdoor unit provided in this application.

[0037] Attached image labels:

[0038] 1. First solenoid valve; 2. Water pump; 3. Pressure sensor; 4. Second solenoid valve; 5. Third solenoid valve; 6. Outdoor unit body; 7. Temperature sensor; 8. Inlet pipe; 81. Filter; 9. Bypass solenoid valve; 10. Bypass capillary tube. Detailed Implementation

[0039] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0040] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0041] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0042] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0043] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0044] With the rapid development of the Internet and the Internet of Things, the demand for information and data processing has risen sharply. The cooling energy consumption required by data processing centers to process data continues to increase. For how to reduce the cooling energy consumption of data centers to reduce cooling costs, air conditioning spray outdoor units have strong relevance and good market application prospects in energy-saving projects.

[0045] The outdoor unit of the air conditioner spray system is connected to the condenser of the air conditioning system through system piping. In actual use, the design of the system piping and nozzles, as well as the selection of the water pump, maximize the spray area. When the spray evaporates, it absorbs heat, which can reduce the ambient temperature of the outdoor unit of the air conditioning system. The condenser can more easily transfer heat to the surrounding environment, thereby improving the heat exchange efficiency of the condenser and reducing the energy consumption of the air conditioner.

[0046] In the process of developing this application, the inventors discovered at least the following technical problems in the prior art:

[0047] However, the use of air conditioning spray outdoor units is seasonal. When the outdoor temperature is close to the freezing temperature of the water in the system pipes, in order to prevent the system pipes from freezing and cracking, manual maintenance is required to drain and purge the system pipes of the air conditioning spray outdoor unit. The above drainage process is labor-intensive and may result in incomplete drainage.

[0048] Therefore, this application provides a drainage control method for an air conditioning spray outdoor unit, please refer to... Figure 1 and Figure 2 ,

[0049] The air conditioning spray outdoor unit includes a first solenoid valve 1, a water pump 2, a pressure sensor 3, a second solenoid valve 4, a third solenoid valve 5, the outdoor unit body 6, and a temperature sensor 7, connected in sequence; the drainage control method of the air conditioning spray outdoor unit includes:

[0050] The preset drainage temperature and the actual ambient temperature are obtained, and the opening and closing of the first solenoid valve 1 are controlled according to the relationship between the actual ambient temperature and the preset drainage temperature.

[0051] With the first solenoid valve 1 closed, the second solenoid valve 4 and the third solenoid valve 5 are opened to perform the first drainage.

[0052] After the second solenoid valve 4 and the third solenoid valve 5 have been running for a first preset time, the first outlet pressure before the water pump 2 is turned on is obtained, and the water pump 2 is turned on to perform the second drainage.

[0053] The preset outlet pressure difference of water pump 2 is obtained. After water pump 2 has been running for a second preset time, the second outlet pressure after water pump 2 is turned on is obtained. The first outlet pressure difference between the first outlet pressure and the second outlet pressure is obtained. The opening and closing of water pump 2, second solenoid valve 4 and third solenoid valve 5 are controlled according to the magnitude of the preset outlet pressure difference and the first outlet pressure difference.

[0054] In the above-mentioned solution, the drainage control method for the air conditioning spray outdoor unit provided in this application, when the ambient temperature is lower than the drainage temperature, opens the second solenoid valve 4 and the third solenoid valve 5 to drain most of the water; then, by opening the water pump 2, the water pump 2, together with the second solenoid valve 4 and the third solenoid valve 5, drains some residual water; finally, the residual amount of water is judged by the magnitude of the preset outlet pressure difference and the first outlet pressure difference. If it does not meet the requirements, the drainage process continues. That is, the drainage control method for the air conditioning spray outdoor unit of this application adopts a dual drainage method of automatically draining by opening the second solenoid valve 4 and the third solenoid valve 5, and forcibly draining by opening the water pump 2. It also judges whether the drainage is complete based on the outlet pressure difference after drainage, so as to determine whether the drainage step needs to be enhanced. The drainage is automated while ensuring the thoroughness of drainage, with low workload, thereby effectively reducing the labor maintenance cost.

[0055] In some embodiments, the air conditioning spray outdoor unit includes a first solenoid valve 1, a water pump 2, a pressure sensor 3, a second solenoid valve 4, a third solenoid valve 5, an outdoor unit body 6, a temperature sensor 7, a water inlet pipe 8, a filter 81, a bypass solenoid valve 9, and a bypass capillary tube 10.

[0056] The water inlet pipe 8 is connected to a tap water pipe or a water storage tank to provide water to the outdoor unit 6.

[0057] The first solenoid valve 1 is connected to the water inlet pipe 8 and is used to control the flow of water in the water inlet pipe 8 into or stop the flow of water into the system pipeline of the air conditioning spray outdoor unit. That is, the flow of water can be controlled by the movement of the valve core through the electromagnetic coil.

[0058] The filter 81 is connected to the end of the first solenoid valve 1 away from the water inlet pipe 8. It is used to filter impurities in the water and prevent impurities from clogging the system pipes of the air conditioning spray outdoor unit. In actual use, a filter screen or filter element can be used in the filter 81 to intercept particulate matter in the water to achieve the filtration effect.

[0059] The inlet of water pump 2 is connected to filter 81, which can provide a certain water pressure for the air conditioning spray outdoor unit, ensuring that the water flow can be supplied to the subsequent components. In actual use, the impeller in water pump 2 rotates to draw water in from the inlet and discharge it from the outlet.

[0060] Pressure sensor 3 is connected to the outlet of water pump 2 to detect the outlet pressure of water pump 2. In actual use, a piezoresistive or capacitive sensor can be used to convert the water pressure change at the outlet of water pump 2 into an electrical signal and feed it back to the control system of the air conditioning spray outdoor unit.

[0061] The bypass solenoid valve 9 is connected to the end of the pressure sensor 3 away from the water pump 2. The bypass capillary tube 10 connects the bypass solenoid valve 9 to the water pump 2 inlet. The bypass solenoid valve 9 and the bypass capillary tube 10 are used to provide a bypass path to regulate the flow rate of water in the main pipeline and disperse the water pressure. In actual use, the movement of the valve core is controlled by the electromagnetic coil in the bypass solenoid valve 9 to realize the opening or closing of the water flow, and the flow rate is reduced by the bypass capillary tube 10 which restricts the flow of water.

[0062] The second solenoid valve 4 is connected in parallel with the bypass solenoid valve 9 to discharge water from the outdoor unit of the air conditioner spray system. In actual use, the movement of the valve core is controlled by the electromagnetic coil inside the second solenoid valve 4 to achieve the water discharge process.

[0063] The third solenoid valve 5 is connected to the outlet of the water pump 2, and the outdoor unit body 6 is connected to the third solenoid valve 5. In actual use, the movement of the valve core is controlled by the electromagnetic coil inside the third solenoid valve 5 to realize the inflow or cessation of water flow into the outdoor unit body 6. The outdoor unit body 6 is equipped with nozzles, which generate fine water droplets through high-pressure water flow. These water droplets evaporate rapidly in the air, take away heat, reduce the temperature of the surrounding environment, and thus improve the condensing efficiency of the air conditioner condenser.

[0064] It should be noted that this application does not limit the number of the second solenoid valve 4 and the outdoor unit body 6, and the number can be selected according to the size of the air conditioner and the cooling requirements. Preferably, the air conditioner spray outdoor unit includes two third solenoid valves 5, a first spray module and a second spray module, and two outdoor unit bodies 6 arranged in parallel. Among them, one third solenoid valve 5 and the first spray module are connected to one outdoor unit body 6, and the other third solenoid valve 5 and the second spray module are connected to the other outdoor unit body 6.

[0065] Temperature sensor 7 is connected to outdoor unit body 6 and is used to detect the actual ambient temperature around the air conditioner spray outdoor unit.

[0066] The technical solution of this application is described below with reference to specific embodiments:

[0067] Step S10: Obtain the preset drainage temperature and the actual ambient temperature, and control the opening and closing of the first solenoid valve according to the relationship between the actual ambient temperature and the preset drainage temperature.

[0068] In step S10, the preset drainage temperature of the air conditioning spray outdoor unit refers to the minimum temperature at which drainage measures are required to ensure the normal operation of the air conditioning spray outdoor unit in a low-temperature environment, in order to prevent the water in the pipes of the air conditioning spray outdoor unit from freezing. In this application, the preset drainage temperature is ≤10℃. Preferably, the preset drainage temperature is 10℃.

[0069] The opening and closing of the first solenoid valve 1 is controlled based on the relationship between the actual ambient temperature and the preset drainage temperature, specifically including:

[0070] Determine whether the actual ambient temperature is greater than the preset drainage temperature;

[0071] If the actual ambient temperature is greater than the preset drainage temperature, the first solenoid valve 1 remains open, and the air conditioner spray unit continues to work to reduce the condenser temperature.

[0072] If the actual ambient temperature is less than or equal to the preset drainage temperature, the first solenoid valve 1 will be closed to prevent the water in the pipe from freezing.

[0073] Step S20: With the first solenoid valve 1 closed, the second solenoid valve 4 and the third solenoid valve 5 are opened to perform the first drainage process.

[0074] In step S20, after the actual ambient temperature reaches the preset drainage temperature and the first solenoid valve 1 is closed, the water in the air conditioner spray unit needs to be drained to prevent the pipes from freezing. At this time, the bypass solenoid valve 9, the second solenoid valve 4, and the third solenoid valve 5 are opened. Some water flows into the bypass capillary tube 10, some water is discharged through the second solenoid valve 4, and the remaining water is discharged by the spray action of the outdoor unit body 6, thus completing the first drainage process of the air conditioner spray unit.

[0075] The initial preset time for the first drainage process is 25 to 35 minutes. Optional values ​​include 25, 27, 29, 31, 33, and 35 minutes, or other values ​​within this range. It is understood that a first preset time within this range can effectively drain most of the water from the pipes.

[0076] In step S30, after the second solenoid valve 4 and the third solenoid valve 5 have been running for a first preset time, the pressure sensor 3 obtains the first outlet pressure before the water pump 2 is turned on, and turns on the water pump 2 to perform the second drainage process.

[0077] In step S30, after the first drainage process in step S20, there is still residual water in the pipeline. At this time, the water pump 2 is started. The water in the bypass capillary tube 10, the front end of the water pump 2 and other pipelines is collected by the water pump 2 and discharged by the opened second solenoid valve 4 and third solenoid valve 5, thus completing the second drainage process.

[0078] The second preset time for the second drainage process is 3s to 7s. Optionally, the second preset time can be 3s, 4s, 5s, 6s, or 7s, or other values ​​within this range; no limitation is made here. Understandably, a second preset time within the above range can effectively drain most of the residual water from the pipes.

[0079] Step S40: Obtain the preset outlet pressure difference of water pump 2. After water pump 2 has been running for a second preset time, pressure sensor 3 obtains the second outlet pressure after water pump 2 is turned on, and obtains the first outlet pressure difference between the first outlet pressure and the second outlet pressure. Control the opening and closing of water pump 2, second solenoid valve 4 and third solenoid valve 5 according to the magnitude of the preset outlet pressure difference and the first outlet pressure difference.

[0080] In step S40, the preset outlet pressure difference refers to the pressure difference before and after drainage from the air conditioner spray outdoor unit. This pressure difference can be used to determine whether the amount of residual water in the pipe meets the requirements. In this application, the preset outlet pressure difference is ≤100 kPa, and preferably, the preset outlet pressure difference is 100 kPa. The first outlet pressure is the pressure after the first drainage, and the second outlet pressure is the pressure after the second drainage. The pressure increases as the drainage process progresses. Step S40 specifically includes:

[0081] Determine whether the first outlet pressure difference is greater than the preset outlet pressure difference;

[0082] If the first outlet pressure difference is greater than or equal to the preset outlet pressure difference, there is still a lot of water in the pipeline. After the third preset time, water pump 2 will be restarted and run for the second preset time to carry out the third drainage process.

[0083] The third preset time is 5h to 7h, specifically 5h, 5.5h, 6h, 6.5h, and 7h, or other values ​​within this range; no limitation is made here. Understandably, a third preset time within this range allows for effective collection of residual water in the pipes, facilitating the subsequent third drainage process.

[0084] If the first outlet pressure difference is less than the preset outlet pressure difference, close the second solenoid valve 4 and the third solenoid valve 5.

[0085] After the fourth preset time ends in step S40, a second running process in step S50 is also included, which is used to drain all the residual water in the pipe, ensuring thorough drainage, low cost and effectively reducing manpower maintenance costs, and improving drainage reliability.

[0086] The fourth preset time is 23h~25h, which is optional. Specifically, the fourth preset time can be 23h, 23.3h, 23.6h, 23.9h, 24.2h, 24.5h, 24.8h, and 25h, or other values ​​within this range. It can be selected according to actual needs and is not limited here. Understandably, with the fourth preset time within the above range, residual water in the pipeline after the first operation can be effectively collected, facilitating drainage during the subsequent second operation.

[0087] Step S50 (second run): After closing the second solenoid valve 4 and the third solenoid valve 5 and holding for a fourth preset time, with the first solenoid valve 1 closed, open the second solenoid valve 4 and the third solenoid valve 5 to perform the fourth drainage process.

[0088] After the second solenoid valve 4 and the third solenoid valve 5 have been running for a first preset time, the pressure sensor 3 obtains the third outlet pressure before the water pump 2 is turned on, and turns on the water pump 2 to carry out the fifth drainage process.

[0089] After the water pump 2 has been running for a second preset time, the pressure sensor 3 acquires the fourth outlet pressure after the water pump 2 is turned on, and obtains the second outlet pressure difference between the third outlet pressure and the fourth outlet pressure. Based on the magnitude of the preset outlet pressure difference and the second outlet pressure difference, the water pump 2, the second solenoid valve 4 and the third solenoid valve 5 are controlled to open and close.

[0090] Step S50 includes:

[0091] Determine whether the second outlet pressure difference is greater than the preset outlet pressure difference;

[0092] If the second outlet pressure difference is greater than or equal to the preset outlet pressure difference, the water pump 2 will be restarted after the third preset time and run for the second preset time to perform the sixth drainage process.

[0093] If the second outlet pressure difference is less than the preset outlet pressure difference, close the second solenoid valve 4 and the third solenoid valve 5 to complete the automatic drainage process of the air conditioning spray outdoor unit.

[0094] Understandably, the second operation is a repetition of the steps from the first operation, resulting in a more thorough drainage process. In other words, this application ensures the thoroughness of drainage from the air conditioning spray unit by automating the first and second operation processes through steps S10 to S50.

[0095] The above description, based on the embodiments shown in the figures, details the structure, features, and effects of the present invention. The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. A drainage control method for an air conditioning spray outdoor unit, characterized in that, The air conditioning spray outdoor unit includes a first solenoid valve, a water pump, a pressure sensor, a second solenoid valve, a third solenoid valve, an outdoor unit body, a water inlet pipe, and a temperature sensor. The first solenoid valve is connected to the water inlet pipe. The second solenoid valve is used to drain water from the air conditioning spray outdoor unit. The third solenoid valve is connected to the outlet of the water pump. The outdoor unit body is connected to the third solenoid valve. The drainage control method of the air conditioning spray outdoor unit includes: The preset drainage temperature and the actual ambient temperature are obtained, and the opening and closing of the first solenoid valve are controlled according to the relationship between the actual ambient temperature and the preset drainage temperature. With the first solenoid valve closed, the second and third solenoid valves are opened to perform the first drainage. After the second solenoid valve and the third solenoid valve have been running for a first preset time, the first outlet pressure before the water pump is turned on is obtained, and the water pump is turned on to perform the second drainage. The preset outlet pressure difference of the water pump is obtained. After the water pump has been running for a second preset time, the second outlet pressure after the water pump is turned on is obtained. The first outlet pressure difference between the first outlet pressure and the second outlet pressure is obtained. The opening and closing of the water pump, the second solenoid valve and the third solenoid valve are controlled according to the magnitude of the preset outlet pressure difference and the first outlet pressure difference. The step of controlling the opening and closing of the water pump, the second solenoid valve, and the third solenoid valve based on the magnitude of the preset outlet pressure difference and the first outlet pressure difference includes: Determine whether the first outlet pressure difference is greater than the preset outlet pressure difference; If the first outlet pressure difference is greater than or equal to the preset outlet pressure difference, the water pump is restarted after the third preset time and runs for the second preset time to perform the third drainage process. If the first outlet pressure difference is less than the preset outlet pressure difference, close the second solenoid valve and the third solenoid valve.

2. The drainage control method for an air conditioning spray outdoor unit according to claim 1, characterized in that, The opening and closing of the first solenoid valve are controlled according to the difference between the actual ambient temperature and the preset drainage temperature; including: Determine whether the actual ambient temperature is greater than the preset drainage temperature; If the actual ambient temperature is greater than the preset drainage temperature, the first solenoid valve remains open. If the actual ambient temperature is less than or equal to the preset drainage temperature, the first solenoid valve is closed.

3. The drainage control method for an air conditioning spray outdoor unit according to claim 1, characterized in that, If the first outlet pressure difference is less than the preset outlet pressure difference, after closing the second solenoid valve and the third solenoid valve, a second operation process is also included: After closing the second solenoid valve and the third solenoid valve and maintaining this position for a fourth preset time, with the first solenoid valve closed, the second solenoid valve and the third solenoid valve are opened to perform the fourth drainage process. After the second solenoid valve and the third solenoid valve have been running for a first preset time, the third outlet pressure before the water pump is turned on is obtained, and the water pump is turned on to perform the fifth drainage process. After the water pump has been running for a second preset time, the fourth outlet pressure after the water pump is turned on is obtained, and the second outlet pressure difference between the third outlet pressure and the fourth outlet pressure is obtained. The opening and closing of the water pump, the second solenoid valve and the third solenoid valve are controlled according to the magnitude of the preset outlet pressure difference and the second outlet pressure difference.

4. The drainage control method for an air conditioning spray outdoor unit according to claim 3, characterized in that, The opening and closing of the water pump, the second solenoid valve, and the third solenoid valve are controlled according to the magnitude of the preset outlet pressure difference and the second outlet pressure difference; including: Determine whether the second outlet pressure difference is greater than the preset outlet pressure difference; If the second outlet pressure difference is greater than or equal to the preset outlet pressure difference, the water pump is restarted after the third preset time and runs for the second preset time to perform the sixth drainage process. If the second outlet pressure difference is less than the preset outlet pressure difference, the second solenoid valve and the third solenoid valve are closed to complete the automatic drainage process of the air conditioner spray outdoor unit.

5. The drainage control method for an air conditioning spray outdoor unit according to claim 4, characterized in that, The first preset time is 25 min to 35 min.

6. The drainage control method for an air conditioning spray outdoor unit according to claim 4, characterized in that, The second preset time is 3s to 7s.

7. The drainage control method for an air conditioning spray outdoor unit according to claim 4, characterized in that, The third preset time is 5h~7h.

8. The drainage control method for an air conditioning spray outdoor unit according to claim 4, characterized in that, The fourth preset time is 23h~25h.

9. An air conditioning spray outdoor unit, characterized in that, The air conditioning spray outdoor unit adopts the drainage control method of the air conditioning spray outdoor unit as described in any one of claims 1 to 8.

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