Outdoor unit, air conditioning system and control method of air conditioning system

Abstract

The invention relates to the technical field of air conditioners, particularly provides an outdoor unit, an air conditioning system and a control method of the air conditioning system, and aims to solve the problem that a chassis of an existing through-wall machine is easy to freeze at low temperature, so that the whole machine cannot operate normally. In order to achieve the purpose, the outdoor unit comprises a base plate and a first electric heater, a water storage tank is arranged on the base plate and used for receiving water generated by heat exchange of an outdoor heat exchanger, a first water drainage opening is formed in the water storage tank and used for draining water in the water storage tank, and the first electric heater is arranged in the water storage tank; and whether the first electric heater is started or not is determined according to the working mode of the air conditioning system and the outdoor environment temperature. Particularly, when the outdoor heat exchanger generates water and the outdoor environment temperature is low, the first electric heater is started, the first electric heater can heat water in the water storage tank, the freezing phenomenon cannot occur in the water storage tank, it can be guaranteed that accumulated water in the water storage tank can be smoothly discharged, and then it is guaranteed that the outdoor unit can normally operate.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and specifically provides an outdoor unit, an air conditioning system and a control method thereof. Background Art

[0002] When existing heat pump models are used for low-temperature heating, in order to prevent the condensed water generated by the outer condenser or the condensed water generated during defrosting from accumulating and freezing in the chassis, an electric heating belt is usually arranged in the chassis to ensure that the condensed water in the chassis can smoothly pass through the drainage holes of the chassis and be discharged from the machine.

[0003] However, PTAC and TTW through-wall machines are integral machines. During after-sales installation, the whole machine is pushed into an outer box that has been buried in the wall. When the low-temperature heat pump is heating, the condensed water is drained from the drainage of the whole machine chassis to the outer box, and then discharged to the outside through the drainage holes at the bottom of the outer box; however, the condensed water flowing into the outer box is likely to freeze on the chassis under low-temperature conditions due to the large bottom area of the outer box, blocking the drainage holes of the outer box, resulting in the machine being unable to drain water normally and ultimately affecting the normal operation of the whole machine.

[0004] Therefore, there is an urgent need for an outdoor unit and an air conditioning system to solve the above technical problems. Summary of the Invention

[0005] The present invention aims to solve the above technical problems, that is, to solve the problem that the chassis of the existing through-wall machine is prone to icing at low temperatures, resulting in the whole machine being unable to operate normally.

[0006] In a first aspect, the present invention provides an outdoor unit, which includes a chassis and a first electric heater. A water storage tank is arranged on the chassis, and the water storage tank is used to receive the water generated by the heat exchange of the outdoor heat exchanger. A first drain port is arranged in the water storage tank for discharging the water in the water storage tank, and the first electric heater is arranged in the water storage tank.

[0007] In a specific embodiment of the above outdoor unit, the first electric heater is partially arranged at the first drain port;

[0008] In a specific embodiment of the above outdoor unit, the first electric heater includes an auxiliary electric heater, which is arranged at the first drain port.

[0009] In a specific embodiment of the above outdoor unit, a drain nozzle is arranged below the first drain port.

[0010] In a specific embodiment of the above outdoor unit, the outdoor unit further includes a drain pan, which is arranged below the water storage tank. The first drain port can discharge water into the drain pan, and the second drain port of the drain pan extends to the drain hole of the outdoor unit housing, so that the water in the drain pan can be discharged to the outside through the drain hole.

[0011] In the specific implementation manner of the above outdoor unit, the drain pan is snap-connected to the chassis;

[0012] In the specific implementation manner of the above outdoor unit, the outer side of the drain pan is coated with a heat-insulating material.

[0013] In the specific implementation manner of the above outdoor unit, a second electric heater is arranged in the drain pan.

[0014] In a second aspect, the present invention provides an air-conditioning system, and the air-conditioning system includes the above-mentioned outdoor unit.

[0015] In a third aspect, the present invention provides a control method for the above-mentioned air-conditioning system, characterized by including:

[0016] Determine whether to turn on the first electric heater according to the working mode of the air-conditioning system and the outdoor ambient temperature;

[0017] In the specific implementation manner of the above control method, "determine whether to turn on the first electric heater according to the working mode of the air-conditioning system and the outdoor ambient temperature" includes:

[0018] If the air-conditioning system is in a heating mode or a defrosting mode, and the outdoor ambient temperature is lower than a first preset temperature, then turn on the first electric heater.

[0019] In the specific implementation manner of the above control method, the first electric heater is partially arranged at the first drain outlet;

[0020] Determine whether to increase the heating capacity of the first electric heater at the first drain outlet according to the water temperature at the first drain outlet;

[0021] In the specific implementation manner of the above control method, "determine whether to increase the heating capacity of the first electric heater at the first drain outlet according to the water temperature at the first drain outlet" includes:

[0022] If the water temperature at the first drain outlet is lower than a second preset temperature, then increase the heating capacity of the first electric heater at the first drain outlet;

[0023] In the specific implementation manner of the above control method, "increase the heating capacity of the first electric heater at the first drain outlet" includes:

[0024] At least increase the power of the first electric heater at the first drain outlet; and / or

[0025] The first electric heater includes an auxiliary electric heater, which is arranged at the first drain outlet; "increase the heating capacity of the first electric heater at the first drain outlet" includes:

[0026] Turn on the auxiliary electric heater.

[0027] In a specific embodiment of the above control method, a second electric heater is provided in the drain pan;

[0028] Determine whether to turn on the second electric heater according to the temperature in the drain pan;

[0029] In a specific embodiment of the above control method, "determine whether to turn on the second electric heater according to the temperature in the drain pan" includes:

[0030] If the temperature in the drain pan is lower than a third preset temperature, turn on the second electric heater; wherein, the third preset temperature is lower than the second preset temperature.

[0031] In the case of adopting the above technical solution, the outdoor unit of the present invention includes a chassis and a first electric heater. A water storage tank is provided on the chassis. The water storage tank is used to receive the water generated by the heat exchange of the outdoor heat exchanger. A first drain port is provided in the water storage tank for discharging the water in the water storage tank. A first electric heater is provided in the water storage tank; determine whether to turn on the first electric heater according to the working mode of the air-conditioning system and the outdoor ambient temperature. Specifically, if the air-conditioning system is in the heating mode or the defrosting mode, and the outdoor ambient temperature is lower than the first preset temperature, turn on the first electric heater; that is, when water is generated by the outdoor heat exchanger and the outdoor ambient temperature is relatively low, turn on the first electric heater. The first electric heater can heat the water in the water storage tank, so that ice will not appear in the water storage tank, and it can ensure that the accumulated water in the water storage tank can be discharged smoothly, thereby ensuring that the outdoor unit can operate normally, so that the air-conditioning system can operate normally.

[0032] Increasing the heating capacity of the first electric heater can enable the water at the drain port to be discharged smoothly, and even if heat is dissipated in the downstream flow path, it can ensure that ice will not form, so that the water in the water storage tank can be discharged smoothly.

[0033] Setting the second electric heater can prevent ice from forming in the drain pan, ensure that the water in the drain pan can be discharged smoothly, and thus ensure that the water in the water storage tank can be discharged smoothly, thereby ensuring that the outdoor unit can operate normally, so that the air-conditioning system can operate normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The following describes the preferred embodiments of the present invention with reference to the drawings, in which:

[0035] Figure 1 is a schematic structural view of the chassis provided by the present invention;

[0036] Figure 2 is a schematic view of the back structure of the chassis provided by the present invention;

[0037] Figure 3 is a partial structural schematic diagram of the outdoor unit provided by the present invention;

[0038] Figure 4 is a structural schematic diagram of the chassis and the drain pan provided by the present invention;

[0039] Figure 5 is a structural schematic of the drain pan and the housing provided by the present invention Figure 1 ;

[0040] Figure 6 is a structural schematic diagram of the drain pan provided by the present invention;

[0041] Figure 7 is a structural schematic of the drain pan and the housing provided by the present invention Figure 2 ;

[0042] Figure 8 is a detailed step flowchart of the control method of the air conditioning system provided by the present invention.

[0043] List of reference numerals:

[0044] 10, outdoor heat exchanger; 20, housing; 1, chassis; 11, 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 embodiments

[0045] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0046] It should be noted that in the description of the present invention, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the direction or positional relationship shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0047] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "setting", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, indirectly connected through an intermediate medium, or the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0048] To solve the problem that the chassis of the existing wall-piercing machine is prone to icing at low temperatures, resulting in the entire machine being unable to operate normally.

[0049] As Figures 1-7 shown, this embodiment discloses an air-conditioning system, where the air-conditioning system can be an ordinary air-conditioning system, or it can also be a heat pump air-conditioning system.

[0050] The air conditioner includes an outdoor unit and an indoor unit. The outdoor unit includes an outdoor heat exchanger 10, a chassis 1, a compressor, and a housing 20, etc. The chassis 1 is arranged below the outdoor heat exchanger 10 and is used to receive the condensed water generated during the heat exchange of the outdoor heat exchanger 10. When the air-conditioning system is in the heating mode or the defrosting mode, the outdoor heat exchanger 10 heats the flowing refrigerant, which will cool the air flowing through the outdoor heat exchanger 10 and generate condensed water. The condensed water will drip onto the chassis 1 under the action of gravity.

[0051] The chassis 1 is arranged inside the housing 20 and is fixed to the housing 20 by screws. A water storage tank 11 is arranged on the chassis 1. The water storage tank 11 is used to receive the water generated by the heat exchange of the outdoor heat exchanger 10, and the water storage tank 11 has a sunken structure. The chassis 1 is made of a metal structure and is specifically processed by stamping.

[0052] As Figure 1 shown, a first drain port 111 is arranged in the water storage tank 11 for discharging the water in the water storage tank 11. The heights of different positions in 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 discharged from the first drain port 111. A drain nozzle 112 is arranged below the first drain port 111. Specifically referring to Figure 2 , it can ensure that during the drainage process, even when the water volume is small, the water will flow downward instead of lying flat on the lower surface of the chassis 1, which can ensure that the lower surface of the chassis 1 will not freeze. Among them, the drain nozzle 112 is specifically formed by punching a flanging downward at the first drain port 111 to form the drain nozzle 112.

[0053] In addition, please refer to Figure 3, a drain valve 13 is provided at the water outlet of the first drain port 111. Specifically, it is an electromagnetic valve or an electric ball valve, and is communicatively connected to the control module of the air-conditioning system through a wire. The opening degree of the drain valve 13 is controlled by the control module. In a low-temperature environment, it is necessary to turn on the heating mode or the defrosting mode. After the heating mode or the defrosting mode is turned on, the outdoor heat exchanger 10 will generate condensed water, and the condensed water needs to be drained away. Therefore, the drain valve 13 is generally opened in a low-temperature environment to drain away the condensed water. Specifically, when the outdoor ambient temperature is lower than the fourth preset temperature, the drain valve 13 is opened. The fourth preset temperature is 12°C. Regarding the fourth preset temperature, it should be noted that although in this embodiment it is 12°C, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art can choose the fourth preset temperature to be 10°C or 15°C, etc., which do not depart from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0054] The first electric heater 12 is arranged in the reservoir 11. Specifically, the first electric heater 12 is an electric heating tape, and the electric heating tape is arranged on the bottom wall of the reservoir 11. The electric heating tape can heat the condensed water in the reservoir 11 so that it cannot freeze, and can make the condensed water in the reservoir 11 drain smoothly, ensuring that the subsequently generated condensed water will not accumulate in the reservoir 11. There is a certain gap between the electric heating tape and the bottom wall, which can allow the water flow to flow under the electric heating tape, ensuring the smooth flow of the condensed water. Regarding the layout form of the electric heating tape, it should be noted that although there is a gap with the bottom wall in this embodiment, in other embodiments, the electric heating tape can also be arranged in a ring shape and attached to the bottom wall, so that the condensed water can flow along the gap between the electric heating tapes. This does not depart from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0055] The air-conditioning system further includes a control module, which can control the operating states of various modules of the air-conditioning system. Specifically, it can control the operating mode of the air-conditioning system, the wind speed of the indoor unit, the cooling 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. It can also control the working states 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 states of the four-way valve, the electromagnetic valve, and the electronic expansion valve.

[0056] The control module is configured to be able to execute the control method of the air-conditioning system. The control method includes the following steps:

[0057] S1. Determine whether to turn on the first electric heater 12 according to the working mode of the air-conditioning system and the outdoor ambient temperature. The outdoor ambient temperature refers to the temperature where the outdoor unit is located.

[0058] "Determine whether to turn on the first electric heater 12 according to the operating mode of the air conditioning system and the outdoor ambient temperature" specifically includes the following detailed steps:

[0059] If the air conditioning system is in the heating mode or the defrosting mode, and the outdoor ambient temperature is lower than the first preset temperature, then turn on the first electric heater 12. The heating mode here refers to the heating mode involving the compressor, that is, the outdoor heat exchanger 10 needs to heat the flowing refrigerant, the outdoor heat exchanger 10 needs to absorb heat from the air, and the outdoor heat exchanger 10 will generate condensed water. In the defrosting mode, the outdoor heat exchanger cools the refrigerant, causing the frost on the outdoor heat exchanger 10 to absorb heat and turn into water.

[0060] If the air conditioning system is not in the heating mode or the defrosting mode, or although the air conditioning system is in the heating mode or the defrosting mode, but the external ambient temperature is not lower than the first preset temperature, then there is no need to turn on the first electric heater 12. When the air conditioning system is not in the heating mode or the defrosting mode, the outdoor heat exchanger 10 will not generate water, so there will be no phenomenon of blocking the first drain port 111 and icing in the reservoir 11, so there is no need to turn on the first electric heater 12. When the air conditioning system is in the heating mode or the defrosting mode, but the external ambient temperature is not lower than the first preset temperature; at this time, although water is generated, due to the relatively high outdoor ambient temperature, there will be no icing phenomenon. Therefore, there is also no need to turn on the first electric heater 12.

[0061] Among them, since water generally freezes at temperatures below 0°C, and when it is just below 0°C, due to the flowing state of the water, it may not freeze. Therefore, it does not freeze at 0°C. Therefore, the value of the first preset temperature is -2°C to +3°C.

[0062] Part of the first electric heater 12 is arranged at the first drain port 111; the control method of this air conditioning system further includes the following steps:

[0063] S2. Determine 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. This step is carried out on the premise that the first electric heater 12 is turned on, that is, during the process of heating the water in the reservoir 11, it is necessary to judge the water temperature at the first drain port 111. When the first electric heater 12 is not turned on, the water will not freeze, and the first drain port 111 will not be blocked by ice. Therefore, in the case where the first electric heater 12 is not turned on, there is no need to perform this step S2.

[0064] A temperature sensor is provided at the first drain outlet 111. The temperature sensor is used to detect the water temperature at the first drain outlet 111. The temperature sensor is communicatively connected to 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.

[0065] "Determine whether to increase the heating capacity of the first electric heater 12 at the first drain outlet 111 according to the water temperature at the first drain outlet 111" specifically includes the following detailed steps:

[0066] If the water temperature at the first drain outlet 111 is lower than the second preset temperature, then increase the heating capacity of the first electric heater 12 at the first drain outlet 111. When the water temperature at the first drain outlet 111 is lower than the second preset temperature, it is very likely that the first drain outlet 111 will be blocked by ice. Therefore, it is necessary to increase the heating capacity of the first electric heater 12 to raise the water temperature at the first drain outlet 111. Since it takes a relatively long flow path for the water to be completely discharged into the natural environment after flowing out from the first drain outlet 111, when the water temperature is low, it is very likely that the water will freeze when flowing in the downstream flow path. Therefore, the water temperature at the first drain outlet 111 cannot be too low, nor can it be a temperature close to the freezing point. It needs to be higher than the freezing point to ensure that there is enough heat dissipation during subsequent flow and to ensure that there is no freezing. Therefore, the second preset temperature needs to be higher than the freezing point temperature. Specifically, the second preset temperature is greater than 2°C. However, when the second preset temperature is too high, there will be a phenomenon of wasting electric energy. Therefore, the second preset temperature is less than 10°C. Regarding the second preset temperature T2, it should be noted that although in this embodiment, 2°C < T2 < 10°C. 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, etc. Specifically, it can be: 3°C < T2 < 8°C. This does not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0067] If the water temperature at the first drain outlet 111 is not lower than the second preset temperature, then there is no need to increase the heating capacity of the first electric heater 12 at the first drain outlet 111.

[0068] "Increase the heating capacity of the first electric heater 12 at the first drain outlet 111" includes:

[0069] Increase the power of the first electric heater 12 at the first drain outlet 111; specifically, increasing the function of the first electric heater 12 can increase the water temperature at the first drain outlet 111, and at the same time can also increase the water temperature at other positions of the reservoir 11, thereby increasing the water temperature at the first drain outlet 111 so that the water temperature at the first drain outlet 111 is greater than the second preset temperature.

[0070] Regarding "improving the heating capacity of the first electric heater 12 at the first drain outlet 111", it should be noted that although the power of the first electric heater 12 is increased in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, it can also be achieved by other means. Specifically, the first electric heater 12 includes an auxiliary electric heater, which is arranged at the first drain outlet 111; wherein the auxiliary electric heater is arranged in parallel with the first electric heater 12; "improving the heating capacity of the first electric heater 12 at the first drain outlet 111" includes: turning on the auxiliary electric heater, which can increase the heat dissipated at the first drain outlet 111, and further increase the water temperature at the first drain outlet 111.

[0071] As Figures 4-7 shown, the outdoor unit further includes a drain pan 2, which is arranged below the water storage tank 11, and the drain pan 2 is snap-connected to the chassis 1; the drain pan 2 is arranged below the first drain outlet 111, so that the first drain outlet 111 can drain water into the drain pan 2, and the second drain outlet 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 can be discharged outward through the drain hole. The drain pan 2 is inclined, and the position where the second drain outlet 21 is located is lower, so that the water in the drain pan 2 can automatically flow to the second drain outlet 21 and then be discharged through the second drain outlet 21. Specifically, a drain pipe is arranged at the second drain outlet 21, and the drain pipe extends outside the drain hole.

[0072] Regarding the drain pan 2, it should be noted that although the drain pan 2 is provided in this embodiment, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, those skilled in the art can choose not to provide the drain pan 2, but to provide a drain pipe, which is connected to the first drain outlet 111 and extends to the outside of the drain hole of the housing 20, and can also drain the water in the water storage tank 11 to the outside. Among them, the drain pipe is coated with a heat-insulating material, which can ensure that the water in the drain pipe will not freeze and can enable the water in the drain pipe to be discharged smoothly.

[0073] Among them, the outside of the drain pan 2 is coated with a heat-insulating material, and the heat-insulating material is specifically a foaming material such as foam; the drain pan 2 can also be made of a material with a lower thermal conductivity, such as a plastic material or a material with a foaming process. The drain pan 2 can be heat-insulated so that when water flows through the drain pan 2, it will not freeze, and the water can flow smoothly in the drain pan 2; however, the drain pan 2 is open, and most of it will always be exposed to the air, resulting in freezing in the drain pan 2.

[0074] To solve this problem, a second electric heater 22 is provided in the drain pan 2; specifically, the second electric heater 22 is an electric heating tape, and there is a certain gap between the electric heating tape and the bottom wall of the drain pan 2, which can enable the water in the drain pan 2 to flow along the bottom wall without waterlogging. Moreover, a temperature sensor is provided in the drain pan 2 for detecting the temperature in the drain pan 2. The temperature sensor is communicatively connected to the control module and can transmit the detected temperature information to the control module. The control module determines whether to turn on the second electric heater 22 to heat the water in the drain pan 2 according to the detected temperature information.

[0075] The control method of the air-conditioning system further includes the following steps:

[0076] S3. Determine whether to turn on the second electric heater 22 according to the temperature in the drain pan 2;

[0077] Among them, step S3 is turned on after increasing the heating capacity of the first electric heater 12. Since no icing phenomenon will occur at the first drain port 111, the water flowing downstream will not freeze either. Therefore, the second electric heater 22 does not need to be turned on. Only when icing is likely to occur at the first drain port 111, icing will occur in the drain pan 2. Therefore, after increasing the heating capacity of the first electric heater 12, step S3 is carried out.

[0078] Among them, "determine whether to turn on the second electric heater 22 according to the temperature in the drain pan 2" includes the following detailed steps:

[0079] If the temperature in the drain pan 2 is lower than the third preset temperature, turn on the second electric heater 22; when the water temperature in the drain pan 2 is relatively low, turning on the second electric heater 22 can heat the water in the drain pan 2, so that no icing phenomenon will occur in the drain pan 2 and ensure the smooth discharge of the water in the drain pan 2. Among them, the third preset temperature is lower than the second preset temperature. Since the water in the drain pan 2 can be directly discharged outside the drain hole and there is almost no flow path downstream, no icing phenomenon will occur due to excessive heat dissipation downstream. Therefore, the third preset temperature does not need to be too high. In order to save electric energy, the third preset temperature can be set lower. Therefore, the third preset temperature is lower than the second preset temperature. In this embodiment, the value of the third preset temperature T3 is preferably 0 < T3 < 5°C.

[0080] Regarding the third preset temperature, it should be noted that although the third preset temperature in this embodiment is 0 < T3 < 5°C. However, this is not a limitation of the present invention. Without departing from the principle of the present invention, in other embodiments, 0 < T3 < 3°C. These do not deviate from the basic principle of the present invention and will fall within the protection scope of the present invention.

[0081] If the temperature in the drain pan 2 is not lower than the third preset temperature, there is no need to turn on the second electric heater 22; when the water temperature in the drain pan 2 is relatively low, turn on the second electric heater 22.

[0082] As Figure 8 shown, the control method of the air-conditioning system specifically includes the following detailed steps:

[0083] S11. Obtain the working mode of the air-conditioning system;

[0084] S12. Determine whether the air-conditioning system is in the heating mode or the defrosting mode. If so, proceed to step S13;

[0085] S13. Determine whether the outdoor ambient temperature is lower than the first preset temperature. If so, proceed to step S14;

[0086] S14. Turn on the first electric heater 12;

[0087] S15. Determine whether the water temperature at the first drain outlet 111 is lower than the second preset temperature. If so, proceed to step S16;

[0088] S16. Enhance the heating capacity of the first electric heater 12;

[0089] S17. Determine whether the temperature in the drain pan 2 is lower than the third preset temperature. If so, turn on the second electric heater 22.

[0090] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present invention.

Claims

1. An outdoor unit, characterized in that, It includes a chassis (1) and a first electric heater (12). A water reservoir (11) is arranged on the chassis (1). The water reservoir (11) is used to receive the water generated by the heat exchange of the outdoor heat exchanger (10). A first drain port (111) is arranged in the water reservoir (11) for draining the water in the water reservoir (11). The first electric heater (12) is arranged in the water reservoir (11).

2. The outdoor unit according to claim 1, characterized in that, The first electric heater (12) is partially arranged at the first drain port (111); Preferably, the first electric heater (12) includes an auxiliary electric heater which is arranged at the first drain port (111).

3. The outdoor unit according to claim 1, characterized in that, A drain nozzle (112) is arranged below the first drain port (111).

4. The outdoor unit according to claim 1, characterized in that, The outdoor unit further includes a drain pan (2) which is arranged below the water reservoir (11). The first drain port (111) can drain water into the drain pan (2). A 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) can be discharged outward through the drain hole.

5. The outdoor unit according to claim 4, characterized in that, The drain pan (2) is snap-connected to the chassis (1); and / or, The outer side of the drain pan (2) is coated with a heat-insulating material.

6. The outdoor unit according to claim 4, characterized in that, A second electric heater (22) is arranged in the drain pan (2).

7. An air conditioning system, characterized in that, It includes the outdoor unit according to any one of claims 1-6.

8. A control method for an air conditioning system as claimed in claim 7, characterized in that, It includes: Determine whether to turn on the first electric heater (12) according to the working mode of the air-conditioning system and the outdoor ambient temperature; Preferably, "determine whether to turn on the first electric heater (12) according to the working mode of the air-conditioning system and the outdoor ambient temperature" includes: If the air-conditioning system is in the heating mode or the defrosting mode and the outdoor ambient temperature is lower than the first preset temperature, then turn on the first electric heater (12).

9. The control method according to claim 8, wherein The first electric heater (12) is partially arranged at the first drain port (111); Determine 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); Preferably, "determine 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)" includes: If the water temperature at the first drain port (111) is lower than the second preset temperature, then increase the heating capacity of the first electric heater (12) at the first drain port (111); Preferably, "increase the heating capacity of the first electric heater (12) at the first drain port (111)" includes: At least increase the power of the first electric heater (12) at the first drain port (111); and / or The first electric heater (12) includes an auxiliary electric heater which is arranged at the first drain port (111); "increase the heating capacity of the first electric heater (12) at the first drain port (111)" includes: Turn on the auxiliary electric heater.

10. The control method according to claim 8, wherein, A second electric heater (22) is arranged in the drain pan (2); Determine whether to turn on the second electric heater (22) according to the temperature in the drainage tray (2); Preferably, "determine whether to turn on the second electric heater (22) according to the temperature in the drainage tray (2)" includes: If the temperature in the drainage tray (2) is lower than a third preset temperature, turn on the second electric heater (22); wherein, the third preset temperature is lower than the second preset temperature.

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