Outdoor unit, and air conditioning system and control method therefor

Abstract

The present invention relates to the technical field of air conditioners, and specifically provides an outdoor unit, and an air conditioning system and a control method therefor, aiming at solving the problem that a chassis of an existing through-the-wall air conditioner is prone to icing at low temperatures, resulting in the whole machine being unable to operate normally. To achieve this objective, the outdoor unit of the present invention comprises a chassis and a first electric heater, wherein the chassis is provided with a drain pan, the drain pan is used for receiving water generated by heat exchange of an outdoor heat exchanger, the drain pan is provided with a first water discharge port for discharging water in the drain pan, and the first electric heater is arranged in the drain pan; and whether to turn on the first electric heater is determined on the basis of a working mode of an air conditioning system and an outdoor ambient temperature. Specifically, when the outdoor heat exchanger generates water and the outdoor ambient temperature is low, the first electric heater is turned on, and the first electric heater can heat water in the drain pan, such that no icing phenomenon occurs in the drain pan, thereby ensuring that accumulated water in the drain pan can be smoothly discharged, and further ensuring that the outdoor unit can operate normally.

Description

Outdoor unit, air conditioning system and control method thereof

[0001] The present application claims priority to Chinese Patent Application No. 202411388508.3, filed on September 30, 2024, entitled "Outdoor unit, air conditioning system and control method thereof", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of air conditioning technology, and specifically provides an outdoor unit, an air conditioning system and a control method thereof. BACKGROUND

[0003] In order to prevent condensate water generated by an outdoor condenser or condensate water generated during defrosting from accumulating and icing in the chassis, an electric heating belt is usually arranged in the chassis to ensure that the condensate water in the chassis can smoothly pass through the drain hole of the chassis and be discharged from the machine.

[0004] However, the PTAC and TTW wall-through machine are integral machines. When installed after sale, the machine is pushed into the outer box that has been embedded in the wall. When the low-temperature heat pump is heating, the condensate water is discharged from the drain of the chassis of the entire machine to the outer box and then discharged to the outside through the drain hole at the bottom of the outer box. However, the condensate water flowing to the outer box is prone to icing on the chassis due to the large area of the bottom surface of the outer box under low-temperature conditions, which can block the drain hole of the outer box and cause the machine to fail to operate normally, ultimately affecting the normal operation of the entire machine.

[0005] Therefore, there is an urgent need for an outdoor unit and an air conditioning system to solve the above technical problems. SUMMARY

[0006] The present application aims to solve the above technical problems, i.e., to solve the problem that the chassis of the existing wall-through machine is prone to icing under low-temperature conditions, which causes the entire machine to fail to operate normally.

[0007] In a first aspect, the present application provides an outdoor unit, comprising a chassis and a first electric heater, wherein the chassis is provided with a water storage pool for collecting water generated by heat exchange of an outdoor heat exchanger, the water storage pool is provided with a first drain hole for discharging water in the water storage pool, and the first electric heater is arranged in the water storage pool.

[0008] In a specific embodiment of the above outdoor unit, the first electric heater is partially arranged at the first drain hole.

[0009] In a specific embodiment of the above outdoor unit, the first electric heater comprises an auxiliary electric heater arranged at the first drain hole.

[0010] In a specific embodiment of the above outdoor unit, a drain nozzle is arranged below the first drain hole.

[0011] In the specific embodiment of the outdoor unit described above, the outdoor unit further comprises a drain tray arranged below the water reservoir, the first drain port is capable of draining water into the drain tray, and a second drain port of the drain tray extends to a drain hole of the outdoor unit housing so that water in the drain tray is drained outwards through the drain hole.

[0012] In the specific embodiment of the outdoor unit described above, the drain tray is connected to the bottom plate by a clamping connection.

[0013] In the specific embodiment of the outdoor unit described above, the outer side of the drain tray is covered with a thermal insulation material.

[0014] In the specific embodiment of the outdoor unit described above, a second electric heater is arranged in the drain tray.

[0015] In a second aspect, the present application provides an air conditioning system comprising the outdoor unit as described above.

[0016] In a third aspect, the present application provides a control method of the air conditioning system as described above, characterized in that, comprising:

[0017] determining whether to turn on the first electric heater according to the working mode of the air conditioning system and the outdoor environment temperature;

[0018] In the specific embodiment of the control method described above, "determining whether to turn on the first electric heater according to the working mode of the air conditioning system and the outdoor environment temperature" comprises:

[0019] if the air conditioning system is in a heating mode or a defrosting mode and the outdoor environment temperature is lower than a first preset temperature, turning on the first electric heater.

[0020] In the specific embodiment of the control method described above, the first electric heater is partially arranged at the first drain port.

[0021] determining whether to increase the heating capacity of the first electric heater at the first drain port according to the water temperature at the first drain port;

[0022] In the specific embodiment of the control method described above, "determining whether to increase the heating capacity of the first electric heater at the first drain port according to the water temperature at the first drain port" comprises:

[0023] if the water temperature at the first drain port is lower than a second preset temperature, increasing the heating capacity of the first electric heater at the first drain port;

[0024] In the specific embodiment of the control method described above, "increasing the heating capacity of the first electric heater at the first drain port" comprises:

[0025] at least increase the power of the first electric heater at the first drain port; and / or

[0026] The first electric heater comprises an auxiliary electric heater arranged at the first drain port; the "increasing the heating capacity of the first electric heater at the first drain port" comprises:

[0027] turning on the auxiliary electric heater.

[0028] In the specific embodiment of the control method, a second electric heater is arranged in the drain pan;

[0029] According to the temperature in the drain pan, it is determined whether to turn on the second electric heater;

[0030] In the specific embodiment of the control method, "determining whether to turn on the second electric heater according to the temperature in the drain pan" comprises:

[0031] If the temperature in the drain pan is lower than a third preset temperature, the second electric heater is turned on; wherein the third preset temperature is lower than the second preset temperature.

[0032] In the case of adopting the above technical solution, the outdoor unit of the present application comprises a chassis and a first electric heater, a water storage tank is arranged on the chassis, the water storage tank is used to receive water generated by heat exchange of an outdoor heat exchanger, a first drain port is arranged in the water storage tank, which is used to drain water in the water storage tank, and a first electric heater is arranged in the water storage tank; according to the working mode of the air conditioning system and the outdoor environment temperature, it is determined whether to turn on the first electric heater. Specifically, if the air conditioning system is in a heating mode or a defrosting mode, and the outdoor environment temperature is lower than a first preset temperature, the first electric heater is turned on; that is, when the outdoor heat exchanger generates water and the outdoor environment temperature is low, the first electric heater is turned on, the first electric heater can heat the water in the water storage tank, can prevent ice formation in the water storage tank, and can ensure that the accumulated water in the water storage tank can be smoothly drained, thereby ensuring that the outdoor unit can operate normally, so that the air conditioning system can operate normally.

[0033] Increasing the heating capacity of the first electric heater can make the water at the drain port be smoothly drained, and even if the downstream flow path is cooled, it can also be ensured that it will not freeze, thereby enabling the water in the water storage tank to be smoothly drained.

[0034] Arranging the second electric heater can prevent ice formation in the drain pan, ensure that the water in the drain pan can be smoothly drained, and further ensure that the water in the water storage tank can be smoothly drained, thereby ensuring that the outdoor unit can operate normally, so that the air conditioning system can operate normally. BRIEF DESCRIPTION OF DRAWINGS

[0035] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. In the drawings:

[0036] Fig. 1 is a structural schematic diagram of a base pan according to the present application;

[0037] Fig. 2 is a structural schematic diagram of the back of the base pan according to the present application;

[0038] Fig. 3 is a structural schematic diagram of a partial structure of an outdoor unit according to the present application;

[0039] Fig. 4 is a structural schematic diagram of a base pan and a drain pan according to the present application;

[0040] Fig. 5 is a structural schematic diagram of a drain pan and a housing according to the present application;

[0041] Fig. 6 is a structural schematic diagram of the drain pan according to the present application;

[0042] Fig. 7 is a structural schematic diagram of the drain pan and the housing according to the present application;

[0043] Fig. 8 is a detailed step flowchart of a control method of an air conditioning system according to the present application.

[0044] List of Reference Signs:

[0045] 10, outdoor heat exchanger; 20, housing; 1, base pan; 11, water reservoir; 111, first drain port; 112, drain nozzle; 12, first electric heater; 13, drain valve; 2, drain pan; 21, second drain port; 22, second electric heater. DETAILED DESCRIPTION

[0046] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely used to explain the technical principles of the present application, and are not intended to limit the scope of protection of the present application.

[0047] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate the direction or positional relationship terms based on the direction or positional relationship shown in the drawings, which are merely for the convenience of description, and do not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0048] In addition, it needs to be explained that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be directly connected, or indirectly connected through intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] In order to solve the problem that the chassis of the existing wall -penetrating machine is easy to freeze at low temperature, so that the whole machine cannot work normally.

[0050] As shown in FIGS. 1-7, the present embodiment discloses an air conditioning system, wherein the air conditioning system can be a common air conditioning system, or it can be a heat pump air conditioning system.

[0051] The air conditioner comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises an outdoor heat exchanger 10, a chassis 1, a compressor and a shell 20, etc., wherein the chassis 1 is arranged below the outdoor heat exchanger 10, and is used to receive the condensate water generated by the outdoor heat exchanger 10 during heat exchange. When the air conditioning system is in heating mode or defrosting mode, the outdoor heat exchanger 10 heats the refrigerant flowing therethrough, which will cause the air flowing through the outdoor heat exchanger 10 to be cooled, and will generate condensate water, which will drip to the chassis 1 under the action of gravity.

[0052] The chassis 1 is arranged in the shell 20, and is fixed on the shell 20 by screws. The chassis 1 is provided with a water storage tank 11, which is used to receive the water generated by the outdoor heat exchanger 10 during heat exchange, and the water storage tank 11 has a sunken structure. The chassis 1 is a metal structure, which is processed by stamping.

[0053] As shown in FIG. 1, the water storage tank 11 is provided with a first drain port 111 for draining the water in the water storage tank 11, wherein the heights of different positions of the water storage tank 11 are inconsistent, and the height at the first drain port 111 is the lowest, so that the water in the water storage tank 11 can flow to the first drain port 111 and then be drained from the first drain port 111. A drain nozzle 112 is arranged below the first drain port 111, which can ensure that the water will flow downward under the condition of small water quantity during the drainage process, instead of being flat on the lower surface of the chassis 1, so as to prevent the phenomenon of icing on the lower surface of the chassis 1. Specifically, the drain nozzle 112 is formed by stamping a flange downward at the first drain port 111 to form the drain nozzle 112.

[0054] In addition, referring to FIG. 3, a drain valve 13 is arranged at the water outlet of the first drain port 111, which is specifically an electromagnetic valve or an electric ball valve, and is in communication connection with the control module of the air conditioning system through a wire, and the opening degree of the drain valve 13 is controlled by the control module. In a low-temperature environment, the heating mode or the defrosting mode needs to be started, and after the heating mode or the defrosting mode is started, the outdoor heat exchanger 10 will produce condensate water, which needs to be drained away, therefore, the drain valve 13 is generally opened in a low-temperature environment to drain away the condensate water. Specifically, when the outdoor environment temperature is lower than a fourth preset temperature, the drain valve 13 is opened, wherein the fourth preset temperature is 12℃, and it needs to be explained that although it is 12℃ in this embodiment, this is not a limitation of the present application, and within the principle of the present application, a person skilled in the art can select the fourth preset temperature to be 10℃ or 15℃ or the like in other embodiments, which does not deviate from the basic principle of the present application and falls within the protection scope of the present application.

[0055] The first electric heater 12 is arranged in the water storage pool 11, wherein the first electric heater 12 is specifically an electric heating belt, and the electric heating belt is arranged on the bottom wall of the water storage pool 11. The electric heating belt can heat the condensate water in the water storage pool 11, so that it cannot freeze, and can make the condensate water in the water storage pool 11 flow out smoothly, to ensure that the subsequent generated condensate water cannot be stored in the water storage pool 11. The electric heating belt has a certain gap with the bottom wall, so that the water flow can flow from below the electric heating belt, to ensure the smooth flow of the condensate water. It needs to be explained that although there is a gap between the electric heating belt and the bottom wall in this embodiment, in other embodiments, the electric heating belt can also be arranged in a ring shape and attached to the bottom wall, so that the condensate water can flow along the gap between the electric heating belts, which does not deviate from the basic principle of the present application and falls within the protection scope of the present application.

[0056] The air conditioning system further comprises a control module, which can control the operating state of each module of the air conditioning system, specifically can control the operating mode of the air conditioning system, the wind speed of the indoor unit, the refrigeration or heating temperature of the indoor unit, the wind direction of the indoor unit, the wind speed of the outdoor unit and the temperature of the outdoor unit, etc., and can also control the working state of the temperature sensor of the indoor unit, the sensor at the compressor, the sensor at the outdoor heat exchanger 10 and the sensor at the refrigerant pipeline. It is also used to control the state of the four-way valve, the electromagnetic valve and the electronic expansion valve.

[0057] The control module is configured to be able to execute the control method of the air conditioning system, which comprises the following steps:

[0058] S1, determining whether to start the first electric heater 12 according to the working mode of the air conditioning system and the outdoor environment temperature. The outdoor environment temperature refers to the temperature where the outdoor unit is located.

[0059] "According to the working mode of the air conditioning system and the outdoor environment temperature, determining whether to open the first electric heater 12" specifically includes the following detailed steps:

[0060] If the air conditioning system is in a heating mode or a defrosting mode, and the outdoor environment temperature is lower than the first preset temperature, the first electric heater 12 is opened. The heating mode refers to a heating mode in which the compressor participates, that is, the outdoor heat exchanger 10 needs to heat the refrigerant flowing therethrough, the outdoor heat exchanger 10 needs to absorb heat from the air, and the outdoor heat exchanger 10 will produce condensate water. In the defrosting mode, the outdoor heat exchanger cools the refrigerant, so that the frost on the outdoor heat exchanger 10 absorbs heat and turns into water.

[0061] If the air conditioning system is not in a heating mode or a defrosting mode, or although the air conditioning system is in a heating mode or a defrosting mode, the outdoor environment temperature is not lower than the first preset temperature, the first electric heater 12 does not need to be opened. When the air conditioning system is not in a heating mode or a defrosting mode, the outdoor heat exchanger 10 will not produce water, so there will be no phenomenon of blocking the first drain port 111 and freezing in the water storage tank 11, so the first electric heater 12 does not need to be opened. When the air conditioning system is in a heating mode or a defrosting mode, but the outdoor environment temperature is not lower than the first preset temperature; at this time, although water is produced, since the outdoor environment temperature is high, freezing will not occur, so the first electric heater 12 does not need to be opened.

[0062] Among them, since water generally freezes at a temperature lower than 0℃, and when it is just below 0℃, the water is in a flowing state and may not freeze, so freezing will not occur at 0℃. Therefore, the first preset temperature is -2℃ to +3℃.

[0063] The first electric heater 12 is partially arranged at the first drain port 111; the control method of the air conditioning system further includes the following steps:

[0064] S2, according to the water temperature at the first drain port 111, determining whether to increase the heating capacity of the first electric heater 12 at the first drain port 111. This step is performed on the premise that the first electric heater 12 is opened, that is, during the heating of the water in the water storage tank 11, the water temperature at the first drain port 111 needs to be determined. When the first electric heater 12 is not opened, the water will not freeze, and the first drain port 111 will not be blocked due to freezing, so this step S2 does not need to be performed when the first electric heater 12 is not opened.

[0065] The temperature sensor is arranged at the first drain port 111 and is used to detect the water temperature at the first drain port 111. The temperature sensor is in communication connection with the control module through a wire. The temperature sensor can transmit the detected temperature information to the control module, so that the control module controls the first electric heater 12.

[0066] The determination of whether to increase the heating capacity of the first electric heater 12 at the first drain port 111 according to the water temperature at the first drain port 111 specifically includes the following detailed steps:

[0067] If the water temperature at the first drain port 111 is lower than the second preset temperature, the heating capacity of the first electric heater 12 at the first drain port 111 is increased. When the water temperature at the first drain port 111 is lower than the second preset temperature, the first drain port 111 is likely to be blocked by ice. Therefore, the heating capacity of the first electric heater 12 needs to be increased to increase the water temperature at the first drain port 111. Since the water needs to flow through a long flow path after leaving the first drain port 111 before being completely discharged to the natural environment, the water is likely to freeze when flowing through the downstream flow path when the water temperature is low. Therefore, the water temperature at the first drain port 111 cannot be too low, and cannot be close to the freezing point. The water temperature needs to be higher than the freezing point to ensure that sufficient heat is dissipated during subsequent flow and to ensure that the water does not freeze. Therefore, the second preset temperature needs to be higher than the freezing point. Specifically, the second preset temperature is greater than 2℃, but if the second preset temperature is too high, the electric energy will be wasted. Therefore, the second preset temperature is less than 10℃. It should be noted that although in the embodiment, 2℃ < T2 < 10℃. In other embodiments, those skilled in the art can select the value of the second preset temperature according to the length and angle of the downstream flow path. Specifically, 3℃ < T2 < 8℃. This does not deviate from the basic principles of the present application and falls within the scope of the present application.

[0068] If the water temperature at the first drain port 111 is not lower than the second preset temperature, the heating capacity of the first electric heater 12 at the first drain port 111 does not need to be increased.

[0069] The increase of the heating capacity of the first electric heater 12 at the first drain port 111 includes:

[0070] The power of the first electric heater 12 at the first drain port 111 is increased. Specifically, the increase of the function of the first electric heater 12 can increase the water temperature at the first drain port 111, and also increase the water temperature at other positions of the water storage tank 11, thereby increasing the water temperature at the first drain port 111. The water temperature at the first drain port 111 is greater than the second preset temperature.

[0071] It needs to be explained that the first electric heater 12 is increased in power in the embodiment, but this is not a limitation of the present application, and in other embodiments, the heating capacity of the first electric heater 12 at the first drain port 111 can also be increased in other ways without deviating from the principles of the present application. Specifically, the first electric heater 12 includes an auxiliary electric heater arranged at the first drain port 111; the auxiliary electric heater is arranged in parallel with the first electric heater 12; and the heating capacity of the first electric heater 12 at the first drain port 111 is increased by turning on the auxiliary electric heater, which can increase the heat dissipation at the first drain port 111 and in turn increase the water temperature at the first drain port 111.

[0072] As shown in FIGS. 4-7, the outdoor unit further includes a drain pan 2 arranged below the water reservoir 11, and the drain pan 2 is connected to the bottom pan 1 in a clamping manner; the drain pan 2 is arranged below the first drain port 111, so that the first drain port 111 can drain water into the drain pan 2, and the second drain port 21 of the drain pan 2 extends to the drain hole of the outdoor unit housing 20, so that the water in the drain pan 2 is drained outwards through the drain hole. The drain pan 2 is arranged in an inclined manner, and the position of the second drain port 21 is lower, so that the water in the drain pan 2 is automatically converged to the second drain port 21 and then drained through the second drain port 21. Specifically, a drain pipe is arranged at the second drain port 21, and the drain pipe extends to the outside of the drain hole.

[0073] It needs to be explained that although the drain pan 2 is arranged in the embodiment, this is not a limitation of the present application, and in other embodiments, a person skilled in the art can choose not to arrange the drain pan 2, but to arrange a drain pipe connected to the first drain port 111 and extending to the outside of the drain hole of the housing 20, so as to drain the water in the water reservoir 11 to the outside. The drain pipe is covered with thermal insulation material, which can prevent the water in the drain pipe from freezing and ensure smooth drainage of the water in the drain pipe.

[0074] The outer side of the drain pan 2 is covered with thermal insulation material, which is specifically a foaming material such as foam; or the drain pan 2 can be made of a material with a low thermal conductivity, such as plastic or foaming process material. The drain pan 2 can be thermally insulated to prevent the water flowing through the drain pan 2 from freezing and to ensure smooth flow of the water in the drain pan 2; however, the drain pan 2 is open and most of it is always exposed to the air, which can cause freezing in the drain pan 2.

[0075] To solve this problem, a second electric heater 22 is arranged in the drain pan 2; specifically, the second electric heater 22 is an electric heating belt, which has a certain gap with the bottom wall of the drain pan 2, so that the water in the drain pan 2 can flow along the bottom wall and no water accumulation phenomenon occurs. Moreover, a temperature sensor is arranged in the drain pan 2 to detect the temperature in the drain pan 2. The temperature sensor is in communication connection with the control module, and can transmit the detected temperature information to the control module. According to the detected temperature information, the control module determines whether to start the second electric heater 22 to heat the water in the drain pan 2.

[0076] The control method of the air conditioning system further includes the following steps:

[0077] S3, determining whether to start the second electric heater 22 according to the temperature in the drain pan 2;

[0078] Wherein, the step S3 is started after increasing the heating capacity of the first electric heater 12. Since no icing phenomenon occurs at the first drain port 111, the water flowing downstream will not have icing phenomenon, so the second electric heater 22 does not need to be started. Only when the first drain port 111 is prone to icing phenomenon, the drain pan 2 will have icing phenomenon, so step S3 is performed after the heating capacity of the first electric heater 12 is increased.

[0079] Wherein, the step of "determining whether to start the second electric heater 22 according to the temperature in the drain pan 2" includes the following detailed steps:

[0080] If the temperature in the drain pan 2 is lower than the third preset temperature, the second electric heater 22 is started. When the water temperature in the drain pan 2 is low, the second electric heater 22 is started to heat the water in the drain pan 2, so that no icing phenomenon occurs in the drain pan 2, and the water in the drain pan 2 can be smoothly drained. Wherein, the third preset temperature is lower than the second preset temperature. Since the water in the drain pan 2 can be directly drained to the outside of the drain hole, there is almost no flow path downstream, and no icing phenomenon occurs due to excessive heat dissipation downstream. Therefore, the third preset temperature does not need to be too high, and in order to save power, the third preset temperature can be set to be lower, so the third preset temperature is lower than the second preset temperature. The value of the third preset temperature T3 is preferably 0 < T3 < 5 ℃ in this embodiment.

[0081] It should be noted that although the third preset temperature in this embodiment is 0 < T3 < 5 ℃, this is not a limitation of the present application. Without deviating from the principle of the present application, in other embodiments, 0 < T3 < 3 ℃. This does not deviate from the basic principle of the present application and falls within the protection scope of the present application.

[0082] If the temperature in the drain pan 2 is not lower than the third preset temperature, the second electric heater 22 does not need to be turned on; when the water temperature in the drain pan 2 is low, the second electric heater 22 is turned on.

[0083] As shown in FIG. 8, the control method of the air conditioning system specifically includes the following detailed steps:

[0084] S11, obtaining the working mode of the air conditioning system;

[0085] S12, judging whether the air conditioning system is in a heating mode or a defrosting mode, if yes, proceeding to step S13;

[0086] S13, judging whether the outdoor environment temperature is lower than the first preset temperature, if yes, proceeding to step S14;

[0087] S14, turning on the first electric heater 12;

[0088] S15, judging whether the water temperature of the first drain port 111 is lower than the second preset temperature, if yes, proceeding to step S16;

[0089] S16, enhancing the heating capacity of the first electric heater 12;

[0090] S17, judging whether the temperature in the drain pan 2 is lower than the third preset temperature, if yes, turning on the second electric heater 22.

[0091] So far, the technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

Claims

1. An outdoor unit characterized by comprising: The outdoor unit comprises a bottom plate (1) and a first electric heater (12), the bottom plate (1) is provided with a water storage pool (11) for receiving water generated by heat exchange of an outdoor heat exchanger (10), the water storage pool (11) is provided with a first water outlet (111) for draining water in the water storage pool (11), and the water storage pool (11) is provided with the first electric heater (12).

2. The outdoor unit according to claim 1, characterized by The first electric heater (12) is partially arranged at the first water outlet (111). Preferably, the first electric heater (12) comprises an auxiliary electric heater arranged at the first water outlet (111).

3. The outdoor unit according to claim 1, characterized by A water outlet nozzle (112) is arranged below the first water outlet (111).

4. The outdoor unit according to claim 1, characterized by The outdoor unit further comprises a water drainage plate (2) arranged below the water storage pool (11), the first water outlet (111) can drain water into the water drainage plate (2), and a second water outlet (21) of the water drainage plate (2) extends to a water outlet hole of an outdoor unit shell (20) to drain water in the water drainage plate (2) out of the outdoor unit shell (20) through the water outlet hole.

5. The outdoor unit according to claim 4, characterized by The water drainage plate (2) is connected to the bottom plate (1) through clamping; and / or, An insulating material is wrapped outside the water drainage plate (2).

6. The outdoor unit according to claim 4, characterized by The water drainage plate (2) is provided with a second electric heater (22).

7. An air conditioning system characterized by comprising: The outdoor unit comprises the outdoor unit according to any one of claims 1-6.

8. The control method of the air conditioning system according to claim 7, characterized by, The outdoor unit comprises: According to the working mode of the air conditioning system and the outdoor environment temperature, it is determined whether to start the first electric heater (12); Preferably, "according to the working mode of the air conditioning system and the outdoor environment temperature, it is determined whether to start the first electric heater (12)" comprises: If the air conditioning system is in a heating mode or a defrosting mode, and the outdoor environment temperature is lower than a first preset temperature, the first electric heater (12) is started.

9. The control method according to claim 8, characterized by, The first electric heater (12) is partially arranged at the first water outlet (111). According to the water temperature at the first water outlet (111), it is determined whether to increase the heating capacity of the first electric heater (12) at the first water outlet (111); Preferably, "according to the water temperature at the first water outlet (111), it is determined whether to increase the heating capacity of the first electric heater (12) at the first water outlet (111)" comprises: If the water temperature at the first water outlet (111) is lower than a second preset temperature, the heating capacity of the first electric heater (12) at the first water outlet (111) is increased; Preferably, "increasing the heating capacity of the first electric heater (12) at the first water outlet (111)" comprises: At least increasing the power of the first electric heater (12) at the first water outlet (111); and / or The first electric heater (12) comprises an auxiliary electric heater arranged at the first water outlet (111); "increasing the heating capacity of the first electric heater (12) at the first water outlet (111)" comprises: Turning on the auxiliary electric heater.

10. The control method according to claim 8, characterized by, The water drainage plate (2) is provided with a second electric heater (22). determining whether to turn on the second electric heater (22) according to the temperature in the drain pan (2); Preferably, "determining whether to turn on the second electric heater (22) according to the temperature in the drain pan (2)" comprises: if the temperature in the drain pan (2) is lower than a third preset temperature, turning on the second electric heater (22); wherein the third preset temperature is lower than the second preset temperature.

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