Air conditioner

Abstract

The utility model discloses an air conditioner, and belongs to the technical field of air treatment. The air conditioner comprises an indoor unit; the indoor unit comprises a shell provided with a fresh air inlet, an air return opening and an air supply opening; the first indoor heat exchanger and the second indoor heat exchanger are arranged in the shell, the second indoor heat exchanger is closer to the air supply outlet than the first indoor heat exchanger, and an interval space between the first indoor heat exchanger and the second indoor heat exchanger is a first space; the indoor fan is arranged corresponding to the air supply outlet or is arranged in the first space; the fresh air inlet is located in the windward side of the first indoor heat exchanger. And the return air inlet is communicated with the first space. The air conditioner can adjust the temperature and humidity of fresh air and is small in occupied space.

Description

Technical Field

[0001] The present application relates to the technical field of air treatment, and in particular to an air conditioner. Background Art

[0002] An air conditioner is a device for controlling indoor air, and is a device for adjusting the temperature, humidity, air cleanliness or air flow of indoor air. The air conditioner discharges cooled air obtained through a refrigeration cycle, which generally consists of a process of compressing, condensing, expanding and evaporating a refrigerant, or discharges heated air obtained by reversing the above process, to the indoor space, thereby conditioning the indoor air.

[0003] As the air tightness of energy-saving buildings improves, fresh air fans become necessary equipment. Therefore, there is a situation where air conditioners and fresh air fans are installed at the same time. The fresh air fans can adjust the temperature and humidity of the fresh air and then send it to the indoor room. However, the indoor unit and fresh air fans need to occupy more space and have requirements on the area of ​​the installation room. Utility Model Content

[0004] The present application provides an air conditioner which has the advantage of occupying a small space.

[0005] In one aspect of the present application, an air conditioner comprises: an indoor unit; the indoor unit comprises: a housing, on which a fresh air inlet, a return air outlet and an air supply outlet are provided; a first indoor heat exchanger and a second indoor heat exchanger are arranged in the housing, the second indoor heat exchanger is closer to the air supply outlet than the first indoor heat exchanger, and the interval space between the first indoor heat exchanger and the second indoor heat exchanger is a first space; an indoor fan is arranged corresponding to the air supply outlet, or is arranged in the first space;

[0006] The fresh air inlet is located on the windward side of the first indoor heat exchanger; the return air outlet is connected to the first space;

[0007] The indoor unit also includes: a fresh air valve for opening or closing the fresh air inlet; a return air valve for opening or closing the return air outlet;

[0008] When the fresh air valve is opened and the return air valve is closed, the indoor fan runs, so that the outdoor fresh air flows to the supply air outlet through the fresh air inlet, the first indoor heat exchanger, and the second indoor heat exchanger; when the fresh air valve is closed and the return air valve is opened, the indoor fan runs, so that the indoor air flows to the supply air outlet through the return air outlet and the second indoor heat exchanger.

[0009] The air conditioner provided in the present application comprises: an indoor unit; the indoor unit comprises: a shell, on which two opposite ends are respectively provided with a fresh air inlet and an air supply outlet, and the bottom surface of the shell is provided with a return air outlet.

[0010] In some embodiments, it also includes: a compressor for compressing refrigerant; an outdoor heat exchanger for exchanging heat with outdoor air; a four-way valve for switching the flow direction of the refrigerant in cooling mode and heating mode; a first expansion valve and a second expansion valve for reducing the pressure of the refrigerant; the outdoor heat exchanger, the first expansion valve, the second indoor heat exchanger, the second expansion valve and the first indoor heat exchanger are connected in series in sequence in the refrigerant circuit.

[0011] In some embodiments, it also includes: a first solenoid valve, a first end of which is connected between the second indoor heat exchanger and the second expansion valve, and a second end of which is connected between the first indoor heat exchanger and the four-way valve.

[0012] In some embodiments, the system further includes: a second solenoid valve, a first end of which is connected between the outdoor heat exchanger and the first expansion valve, and a second end of which is connected between the second indoor heat exchanger and the first end of the first solenoid valve.

[0013] In some embodiments, a bypass channel connecting the fresh air inlet and the air supply outlet is provided in the shell; the bypass channel is provided with: a fresh air fan for allowing outdoor fresh air to flow into the room along the bypass channel; and a bypass valve for opening or closing the bypass channel.

[0014] In some embodiments, the indoor unit also includes: a first water receiving pan for collecting condensed water from the first indoor heat exchanger; a second water receiving pan for collecting condensed water from the second indoor heat exchanger; a drain pump for discharging condensed water from the first water receiving pan and the second water receiving pan; a bypass channel connecting the fresh air inlet and the air supply outlet is provided in the shell; and the drain pump is arranged in the bypass channel.

[0015] In some embodiments, it also includes: an outdoor heat exchanger for exchanging heat with outdoor air; a water-refrigerant heat exchanger having a refrigerant channel and a water channel, and the refrigerant channel and the outdoor heat exchanger are connected in parallel in the refrigerant circuit.

[0016] In some embodiments, it also includes: a third solenoid valve, connected in series to the branch where the outdoor heat exchanger is located; and a fourth solenoid valve, connected in series to the branch where the water-refrigerant heat exchanger is located.

[0017] In some embodiments, the indoor unit further comprises: a first water receiving pan for collecting condensed water from the first indoor heat exchanger; a second water receiving pan for collecting condensed water from the second indoor heat exchanger;

[0018] The first water receiving pan and the second water receiving pan are both connected to the inlet end of the water-refrigerant heat exchanger through a pipeline, so that the condensed water flows to the water-refrigerant heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 shows a schematic diagram of an air conditioner according to some embodiments;

[0020] Figure 2 A schematic diagram showing the internal structure of an air conditioner according to some embodiments;

[0021] Figure 3 A flow path diagram of outdoor fresh air in an air conditioner according to some embodiments is shown;

[0022] Figure 4 A diagram showing a flow path of indoor air in an air conditioner according to some embodiments;

[0023] Figure 5 A flow path diagram of outdoor fresh air and indoor air in an air conditioner according to some embodiments is shown;

[0024] Figure 6 A schematic diagram showing the internal structure of an air conditioner according to some other embodiments;

[0025] Figure 7 Shows Figure 6 Cross-sectional view along the BB direction;

[0026] Figure 8 shows a refrigerant circuit diagram of an air conditioner according to some embodiments;

[0027] Fig. 9 A refrigerant circuit diagram of an air conditioner in an indoor cooling mode and a fresh air normal dehumidification mode according to some embodiments is shown;

[0028] Fig.10 A refrigerant circuit diagram of an air conditioner in a fresh air deep dehumidification mode and a fresh air dehumidification and reheating mode according to some embodiments is shown;

[0029] Fig.11 A refrigerant circuit diagram of an air conditioner in a fresh air normal dehumidification mode according to other embodiments is shown;

[0030] Fig.12 A refrigerant circuit diagram of an air conditioner in a fresh air deep dehumidification mode according to other embodiments is shown;

[0031] In the above figures, 10, shell; 11, lower panel; 111, return air outlet; 12, upper panel; 13, front panel; 131, air supply outlet; 14, rear panel; 141, fresh air inlet; 15, bypass channel; 21, first indoor heat exchanger; 22, second indoor heat exchanger; 23, first water receiving pan; 24, second water receiving pan; 25, first drainage pump; 26, second drainage pump; 30, indoor fan; 31, fresh air fan; 41, fresh air valve; 42, return air valve; 43, bypass valve; 51, compressor; 52, four-way valve; 53, outdoor heat exchanger; 54, first expansion valve; 55, second expansion valve; 561, first solenoid valve; 562, second solenoid valve; 563, third solenoid valve; 564, fourth solenoid valve; 57, water-refrigerant heat exchanger. DETAILED DESCRIPTION

[0032] In order to make the purpose and implementation method of the present application clearer, the exemplary implementation method of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0033] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0034] The terms "first", "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0035] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] The air conditioner in this application performs a refrigeration cycle of the air conditioner by using a compressor, a condenser, an expansion valve and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion and evaporation, and supplies refrigerant to the air that has been conditioned and heat-exchanged.

[0037] The compressor compresses the refrigerant gas in a low temperature and low pressure state and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0038] The expansion valve expands the high-temperature and high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a refrigeration effect by utilizing the latent heat of evaporation of the refrigerant to exchange heat with the material to be cooled. In the entire cycle, the air conditioner can adjust the temperature of the indoor space.

[0039] The outdoor unit of the air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, the indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.

[0040] The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger functions as a condenser, the air conditioner functions as a heater in a heating mode, and when the indoor heat exchanger functions as an evaporator, the air conditioner functions as a cooler in a cooling mode.

[0041] The air conditioner according to the embodiment of the present application includes: an outdoor unit installed in an outdoor space and an indoor unit installed in an indoor space. The outdoor unit may be provided with a compressor, an outdoor heat exchanger, an outdoor fan, an expansion valve and similar components of a refrigeration cycle, and the indoor unit may also be provided with an indoor heat exchanger and an indoor fan. In other embodiments, the outdoor unit and the indoor unit may also be an integrated unit.

[0042] Reference Figure 1 and Figure 2 The indoor unit includes a housing 10, which may be in a rectangular parallelepiped shape to form the overall appearance of the indoor unit.

[0043] The housing 10 includes a lower panel 11, an upper panel 12 disposed above the lower panel 11, and side panels disposed between the upper panel 11 and the lower panel 12. A pair of the side panels are a front panel 13 and a rear panel 14.

[0044] In some embodiments, the front panel 13 is provided with an air supply port 131, the rear panel 14 is provided with a fresh air inlet 141, and the lower panel 11 is provided with a return air port 111. In other embodiments, the air supply port can also be provided at the front end of the lower panel 11; the fresh air inlet can also be provided at the rear end of the lower panel 11.

[0045] The fresh air inlet 141 can be connected to the outside through an air duct, so that the outdoor fresh air can enter the housing 10 along the air duct through the fresh air inlet 141. The return air port 111 is used for indoor air to flow in. The air supply port 131 is used for air in the housing 10 to flow into the indoor space.

[0046] The indoor unit includes an indoor heat exchanger, which is disposed in the housing 10 and is used to exchange heat with air passing therethrough.

[0047] The indoor heat exchanger includes a first indoor heat exchanger 21 and a second indoor heat exchanger 22. The first indoor heat exchanger 21 and the second indoor heat exchanger 22 are arranged in a spaced relationship in the housing 10, wherein the second indoor heat exchanger 22 is closer to the air outlet 131 than the first indoor heat exchanger 21; the space between the first indoor heat exchanger 21 and the second indoor heat exchanger 22 is a first space.

[0048] The indoor unit includes an indoor fan 30, which is arranged in the first space; or arranged corresponding to the air outlet 131, that is, the indoor fan 30 is located between the second indoor heat exchanger 22 and the air outlet 131. The indoor fan 30 is used to promote the flow of outdoor fresh air and indoor air. The indoor fan 30 can be a cross-flow fan.

[0049] The fresh air inlet 141 is located on the windward side of the first indoor heat exchanger 21 .

[0050] When the indoor fan 30 is in operation, outdoor fresh air from the fresh air inlet 141 flows to the air supply port 131 through the first indoor heat exchanger 21 and the second indoor heat exchanger 22 in sequence.

[0051] The return air outlet 111 corresponds to the first space, that is, the return air outlet 111 is connected to the first space. When the indoor fan 30 is disposed in the first space, the indoor fan 30 may correspond to being directly above the return air outlet 111 .

[0052] When the indoor fan 30 is running, the indoor air from the return air port 111 flows toward the supply air port 131 through the second indoor heat exchanger 22 .

[0053] The indoor unit of the present application can be installed in a suspended ceiling manner, with the air supply port 131 and the air return port 111 connected to the indoor space, and the fresh air inlet 141 connected to the outdoors through an air duct.

[0054] The indoor unit includes a fresh air valve 41, which can be arranged at the fresh air inlet 141, and is used to open or close the fresh air inlet 141. When fresh air needs to be introduced, the fresh air valve 41 is opened; when fresh air does not need to be introduced, the fresh air valve 41 is closed.

[0055] The indoor unit includes a return air valve 42, which can be arranged at the return air port 111, and is used to open or close the return air port 111. When the air conditioner only turns on the fresh air function, the return air valve 42 is closed; when the air conditioner turns on the indoor mode, such as the cooling mode, the heating mode, the dehumidification mode, etc., the return air valve 42 is opened.

[0056] Reference Figure 3 When the fresh air valve 41 is opened and the return air valve 42 is closed, that is, the fresh air inlet 141 is opened and the return air outlet 111 is closed, the indoor fan 30 operates to allow outdoor fresh air to flow to the air supply outlet 131 through the fresh air inlet 141, the first indoor heat exchanger 21, and the second indoor heat exchanger 22. The outdoor fresh air is processed in the indoor unit and then sent indoors.

[0057] Reference Figure 4 When the fresh air valve 41 is closed and the return air valve 42 is opened, that is, the fresh air inlet 141 is closed and the return air port 111 is opened, the indoor fan 30 operates so that the indoor air flows to the air supply port 131 through the return air port 111 and the second indoor heat exchanger 22. The indoor air is processed in the indoor unit and circulated to the room.

[0058] Reference Figure 5 When the fresh air valve 41 is opened and the return air valve 42 is opened, that is, the fresh air inlet 141 is opened and the return air outlet 111 is opened, the indoor fan 30 operates so that the outdoor fresh air enters the housing 10 from the fresh air inlet 141, passes through the first indoor heat exchanger 21, mixes with the indoor air from the return air outlet 111, and then the mixed air passes through the second indoor heat exchanger 22 to flow to the air supply outlet. The indoor fresh air and indoor air are processed and then sent to the room.

[0059] In the implementation mode provided in the present application, a fresh air inlet 141 is provided on the indoor unit, which can realize the fresh air function of the air conditioner. The first indoor heat exchanger 21 and the second indoor heat exchanger 22 can realize the temperature and humidity adjustment of the fresh air and indoor air. The functions of both a traditional air conditioner and a fresh air fan are realized by one indoor unit, which has the advantage of small footprint.

[0060] In some embodiments, the thickness direction of the first indoor heat exchanger 21 and the second indoor heat exchanger 22 is the same as the air flow direction. The height dimension of the first indoor heat exchanger 21 and the second indoor heat exchanger 22 is smaller than its length dimension, so that the height dimension of the indoor unit is relatively small, reducing the height space occupied by it when it is installed on the ceiling.

[0061] According to the embodiments of the present application, continue to refer to Figure 2The indoor unit includes a first water receiving pan 23. The first water receiving pan 23 is arranged below the first indoor heat exchanger 21 and is used to collect condensed water on the first indoor heat exchanger 21.

[0062] The indoor unit includes a second water receiving pan 24. The second water receiving pan 24 is disposed below the second indoor heat exchanger 22 and is used to collect condensed water on the second indoor heat exchanger 22.

[0063] Combination Figure 6 The indoor unit includes a drain pump for draining the condensed water in the water receiving pan.

[0064] In some embodiments, the first water receiving tray 23 and the second water receiving tray 24 can be two independent parts. There are two drain pumps, namely a first drain pump 25 and a second drain pump 26. The first drain pump 25 is connected to the first water receiving tray 23 to discharge the condensed water in the first water receiving tray 23, and the second drain pump 26 is connected to the second water receiving tray 24 to discharge the condensed water in the second water receiving tray 24.

[0065] In some embodiments, the first water receiving tray 23 and the second water receiving tray 24 may be two independent parts. The first water receiving tray 23 and the second water receiving tray 24 may be connected via a drain pipe. There is one drain pump, and the condensed water in the two water receiving trays can be discharged by the one drain pump.

[0066] In some embodiments, the first water receiving tray 23 and the second water receiving tray 24 are connected to form an integral component through a connecting portion, and the integral component is substantially in a flat "U" shape. There is one drainage pump, and the condensed water in the two water receiving trays can be discharged through the drainage pump.

[0067] In some embodiments, reference Figure 6 and Figure 7 A bypass passage 15 is provided in the housing 10, which is connected to the fresh air inlet 141 and the air outlet 131. Outdoor fresh air can be directly delivered to the room through the bypass passage 15.

[0068] A partition extending frontward and rearward may be provided in the shell 10 , and the partition and the left side wall or the right side wall of the shell 10 form a bypass channel 15 .

[0069] The bypass passage 15 is provided with a bypass valve 43 for connecting or disconnecting the bypass passage 15. When the bypass valve 43 is opened, the bypass passage 15 is connected; when the bypass valve 43 is closed, the bypass passage 15 is disconnected.

[0070] A fresh air fan 31 is provided in the bypass channel 15 for driving outdoor fresh air to flow along the bypass channel 15 .

[0071] When the bypass valve 43 is opened, the fresh air fan 31 is running, and the return air valve 42 is opened, and the indoor fan 30 is running, the outdoor fresh air can flow along the bypass channel 15 and mix with the indoor air at the air supply port 131, which helps to increase the supply air temperature and improve the supply air comfort while keeping the evaporation temperature unchanged.

[0072] In some embodiments, the drain pump is disposed in the bypass channel 15, which does not affect the connectivity of the bypass channel 15, but also saves space in the air supply duct, and reduces the problem of increased wind resistance and affected air volume when the drain pump is disposed in the air supply duct. In the present application, the arrangement of the drain pump disposed in the bypass channel 15 is more reasonable and compact.

[0073] According to the embodiments of the present application, referring to Figure 8 The outdoor unit includes a compressor 51 for sucking and compressing the refrigerant to make it a high-temperature and high-pressure state; a four-way valve 52 for switching the refrigerant flow path in the cooling mode and the refrigerant flow path in the heating mode; an outdoor heat exchanger 53 for performing heat exchange between the refrigerant and the outdoor air; and a first expansion valve 54 for reducing the pressure of the refrigerant. The first expansion valve 54 can also be set in the indoor unit.

[0074] The four-way valve 52 guides the refrigerant compressed by the compressor 51 to the outdoor heat exchanger 53 in the cooling mode, and guides the refrigerant compressed in the compressor 51 to the indoor heat exchanger in the heating mode. The outdoor heat exchanger 53 condenses the refrigerant compressed by the compressor 52 in the cooling mode, and evaporates the refrigerant decompressed by the indoor unit in the heating mode.

[0075] The compressor 51, the four-way valve 52, the outdoor heat exchanger 53, the first expansion valve 54 and the indoor heat exchanger of the indoor unit are connected to form a refrigerant circuit through a refrigerant copper pipe.

[0076] The refrigerant circuit is further provided with a second expansion valve 55 for reducing the pressure of the refrigerant. The second expansion valve 55 may be provided in the indoor unit.

[0077] In the refrigerant circuit, the connections of the compressor 51, the four-way valve 52, the outdoor heat exchanger 53, and the first expansion valve 54 are the same as those of the existing air conditioner. That is, the exhaust end of the compressor 51 is connected to the A pipe of the four-way valve 52, and the C pipe of the four-way valve 52 is connected to the suction end of the compressor 51; the D pipe of the four-way valve 52 is connected to the first end of the outdoor heat exchanger 53, and the B pipe of the four-way valve 52 is connected to the indoor unit.

[0078] In the refrigerant circuit, the second end of the outdoor heat exchanger 53, the first expansion valve 54, the second indoor heat exchanger 22, the second expansion valve 55, the first indoor heat exchanger 21, and the B tube of the four-way valve 52 are connected in series in sequence.

[0079] The refrigerant circuit is also provided with a first solenoid valve 561. The first end of the first solenoid valve 561 is connected between the second indoor heat exchanger 22 and the second expansion valve 55, and the second end of the first solenoid valve 561 is connected between the first indoor heat exchanger 21 and the B tube of the four-way valve 52. In other words, the branch where the second expansion valve 55 and the first indoor heat exchanger 21 are located is connected in parallel with the first solenoid valve 561.

[0080] <Indoor cooling mode>

[0081] Reference Fig. 9 , the second expansion valve 55 is closed, the first solenoid valve 561 is opened, and the first indoor heat exchanger 21 does not work.

[0082] The compressor 51 compresses the refrigerant, and the refrigerant compressed to high temperature and high pressure continues to flow to the outdoor heat exchanger 53 (used as a condenser) through the four-way valve 52, and becomes a low temperature and high pressure two-phase refrigerant after heat exchange with the outdoor air. The refrigerant reaches the first expansion valve 54 for throttling to become a low temperature and low pressure liquid refrigerant, and then enters the second indoor heat exchanger 22 (evaporator) to exchange heat with the indoor air and become a high temperature and low pressure gaseous refrigerant. The gaseous refrigerant returns to the compressor 51 via the first solenoid valve 561 and the four-way valve 52.

[0083] The indoor air is cooled by the second indoor heat exchanger 22 (evaporator) and then sent indoors.

[0084] <Fresh air normal dehumidification mode>

[0085] Reference Fig. 9 , the second expansion valve 55 is closed, and the first solenoid valve 561 is opened. The compressor 51 compresses the refrigerant, and the refrigerant compressed to high temperature and high pressure continues to flow through the four-way valve 52 to the outdoor heat exchanger 53 (used as a condenser), and after heat exchange with the outdoor air, it becomes a low temperature and high pressure two-phase refrigerant. The refrigerant is throttled by the first expansion valve 54 and becomes a low temperature and low pressure liquid refrigerant, and then enters the second indoor heat exchanger 22 (evaporator) to exchange heat with the outdoor fresh air and become a high temperature and low pressure gaseous refrigerant. After the gaseous refrigerant passes through the first solenoid valve 561, it returns to the compressor 51 through the four-way valve 52.

[0086] The outdoor fresh air is cooled and dehumidified by passing through the first indoor heat exchanger 21 (not working) and the second indoor heat exchanger 22 (evaporator) in sequence and then sent to the room.

[0087] <Fresh air deep dehumidification mode>

[0088] Reference Fig.10, the first solenoid valve 561 is closed. The compressor 51 compresses the refrigerant, and the refrigerant compressed to high temperature and high pressure continues to flow to the outdoor heat exchanger 53 (used as a condenser) through the four-way valve 52, and becomes a low temperature and high pressure two-phase refrigerant after heat exchange with the outdoor air. The refrigerant is throttled by the first expansion valve 54 and becomes a low temperature and low pressure liquid refrigerant, and then enters the second indoor heat exchanger 22 (evaporator) to exchange heat with the outdoor fresh air, and then enters the first indoor heat exchanger 21 (evaporator) after passing through the second expansion valve 55 to exchange heat with the outdoor fresh air, and becomes a high temperature and low pressure gaseous refrigerant, and the gaseous refrigerant returns to the compressor 51 through the four-way valve 52.

[0089] The outdoor fresh air is cooled and dehumidified by passing through the first indoor heat exchanger 21 (evaporator) and the second indoor heat exchanger 22 (evaporator) in sequence and then sent to the room.

[0090] <Fresh air dehumidification and reheating mode>

[0091] Reference Fig.10 , the first expansion valve 54 is fully opened, and the first solenoid valve 561 is closed. The compressor 51 compresses the refrigerant, and the refrigerant compressed to high temperature and high pressure continues to flow to the outdoor heat exchanger 53 (used as a condenser) through the four-way valve 52, and after heat exchange with the outdoor heat exchanger 53, it becomes a low temperature and high pressure two-phase refrigerant. The refrigerant continues to pass through the first expansion valve 54 (fully opened) to reach the second indoor heat exchanger 22 (condenser) to exchange heat with the outdoor fresh air to become a low temperature and high pressure two-phase or supercooled refrigerant, and then reaches the second expansion valve 55. The second expansion valve 55 reduces the pressure of the refrigerant into a low temperature and low pressure liquid refrigerant, and then enters the first indoor heat exchanger 21 (evaporator) to exchange heat with the outdoor fresh air, becoming a high temperature and high pressure gas refrigerant, and finally returns to the compressor 51 through the four-way valve 52.

[0092] After being cooled and dehumidified by the first indoor heat exchanger 21 (evaporator), the outdoor fresh air continues to be heated by the second indoor heat exchanger 22 (condenser) and then sent to the room.

[0093] In some embodiments, reference Fig.11 and Fig.12 , a second solenoid valve 562 may be provided in the refrigerant circuit. The first end of the second solenoid valve 562 is connected between the outdoor heat exchanger 53 and the first expansion valve 54, and the second end of the second solenoid valve 562 is connected between the second indoor heat exchanger 22 and the first end of the first solenoid valve 561. In other words, the branch where the first expansion valve 54 and the second indoor heat exchanger 22 are located is connected in parallel with the second solenoid valve 562.

[0094] The second solenoid valve 562 may be an electric ball valve, which can adjust the flow rate and has a relatively small pressure loss.

[0095] In this embodiment, the fresh air normal dehumidification mode and the fresh air deep dehumidification mode are different from the above embodiments, and the difference lies in that:

[0096] <Normal dehumidification with fresh air>

[0097] Reference Fig.11 , when the second solenoid valve 562 is opened and the first expansion valve 54 is disconnected, the second indoor heat exchanger 22 does not work.

[0098] The fresh air is cooled and dehumidified by the first indoor heat exchanger 21 (evaporator) and then sent to the room.

[0099] <Fresh air deep dehumidification>

[0100] Reference Fig.12 , the first solenoid valve 561 is closed and the second solenoid valve 562 is opened.

[0101] The compressor 51 compresses the refrigerant, and the refrigerant compressed to high temperature and high pressure continues to flow through the four-way valve 52 to the outdoor heat exchanger 53 (used as a condenser), and after heat exchange with the outdoor air, it becomes a low temperature and high pressure two-phase refrigerant, and then is divided into two paths:

[0102] One path flows to the second solenoid valve 562 and reaches the inlet of the second expansion valve 55; the other path is throttled by the first expansion valve 54 and becomes a low-temperature and low-pressure liquid refrigerant, and then enters the second indoor heat exchanger 22 (evaporator) to exchange heat with the outdoor fresh air, becoming a high-temperature and low-pressure gaseous refrigerant, and then reaches the inlet of the second expansion valve 55.

[0103] After the two refrigerants merge, they enter the first indoor heat exchanger 21 (evaporator) through the second expansion valve 55 to exchange heat with the outdoor fresh air, becoming a high-temperature, low-pressure superheated refrigerant, and finally return to the compressor 51 through the four-way valve 52.

[0104] <Fresh air and indoor air mixed mode>

[0105] Reference Fig.12 , the first solenoid valve 561 is closed and the second solenoid valve 562 is opened.

[0106] The compressor 51 compresses the refrigerant, and the refrigerant compressed to high temperature and high pressure continues to flow through the four-way valve 52 to the outdoor heat exchanger 53 (used as a condenser), and after heat exchange with the outdoor air, it becomes a low temperature and high pressure two-phase refrigerant, and then is divided into two paths:

[0107] One path flows to the second solenoid valve 562 and reaches the inlet of the second expansion valve 55; the other path is throttled by the first expansion valve 54 and becomes a low-temperature and low-pressure liquid refrigerant, and then enters the second indoor heat exchanger 22 (evaporator) to exchange heat with the outdoor fresh air and indoor air, and becomes a high-temperature and low-pressure gaseous refrigerant, and then reaches the inlet of the second expansion valve 55.

[0108] After the two refrigerants merge, they enter the first indoor heat exchanger 21 (evaporator) through the second expansion valve 55 to exchange heat with the outdoor fresh air, becoming a high-temperature, low-pressure superheated refrigerant, and finally return to the compressor 51 through the four-way valve 52.

[0109] In some embodiments, the outdoor unit includes a water-refrigerant heat exchanger 57. The water-refrigerant heat exchanger 57 has a refrigerant channel and a water channel. The refrigerant channel is connected in parallel with the outdoor heat exchanger 53 in the refrigerant circuit. Water flows through the water channel.

[0110] The water-refrigerant heat exchanger 57 is used to realize heat exchange between the refrigerant and water. When the heat load is low, the water-refrigerant heat exchanger 57 can be used to save energy.

[0111] A third solenoid valve 563 is connected in series to the branch where the outdoor heat exchanger 53 is located, and is used to control the on-off of the refrigerant at the outdoor heat exchanger 53 .

[0112] A fourth solenoid valve 564 is connected in series to the branch where the water-refrigerant heat exchanger 57 is located, and is used to control the on-off of the refrigerant at the water-refrigerant heat exchanger 57 .

[0113] When the load requiring air conditioning is small, the third solenoid valve 563 is disconnected, the fourth solenoid valve 564 is opened, the outdoor fan in the outdoor unit can be turned off, and the refrigerant in the outdoor unit flows through the water-refrigerant heat exchanger 57, using water cooling instead of air cooling.

[0114] In some embodiments, the inlet end of the water channel of the water-refrigerant heat exchanger 57 is connected to the water inlet pipeline, and the outlet end of the water channel is connected to the water outlet pipeline.

[0115] The water inlet pipeline is connected to an external water source. A water pump can be connected in series to the water inlet pipeline to pump water.

[0116] The first water receiving pan 23 and the second water receiving pan 24 are both connected to the inlet end of the water-refrigerant heat exchanger 57 through pipelines, so that the condensed water in the water receiving pans can flow to the water channel of the water-refrigerant heat exchanger 57 .

[0117] A water pump may be connected in series on the pipeline between the water receiving pan and the water-refrigerant heat exchanger 57 to pump water.

[0118] In the present application, a fresh air inlet 141 is provided on the shell 10 of the indoor unit, a fresh air flow path is formed between the fresh air inlet 141 and the air supply outlet 131, and an indoor air flow path is formed between the return air outlet 111 and the air supply outlet 131. At the same time, an indoor heat exchanger is provided on the fresh air flow path to facilitate the temperature and humidity adjustment of the outdoor fresh air and the indoor air. Compared with the prior art in which the air conditioner and the fresh air fan are installed at the same time, there is a problem of occupying a large space. The indoor unit of the present application has a fresh air function, and there is no need to install two machines indoors at the same time, which simplifies the indoor installation and has the problem of occupying a small space.

[0119] In the present application, it is only necessary to connect the fresh air inlet 141 to the air duct. Compared with the complex arrangement of the air duct in the fresh air fan in the prior art, the arrangement of the air duct of the air conditioner is relatively simple, which simplifies the installation of the air duct.

[0120] In the present application, a water-refrigerant heat exchanger connected in parallel with the outdoor heat exchanger is added to the outdoor unit, and water cooling can be used alone when the load is small, which is more energy-saving.

[0121] In the present application, the water receiving pan is connected to the water inlet pipe of the water-refrigerant heat exchanger through a pipe, so that the condensed water in the water receiving pan can be discharged to the water-refrigerant heat exchanger, thereby achieving full utilization of the condensed water.

[0122] In the present application, a fresh air bypass channel is set in the indoor unit, through which the fresh air can be mixed with the indoor air at the air supply outlet, thereby increasing the supply air temperature and thus improving the air supply comfort.

[0123] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0124] For the convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. An air conditioner, characterized in that: include: Indoor unit; The indoor unit comprises: A shell body, on which a fresh air inlet, a return air outlet and an air supply outlet are provided; A first indoor heat exchanger and a second indoor heat exchanger are arranged in the shell, the second indoor heat exchanger is closer to the air outlet than the first indoor heat exchanger, and the interval space between the first indoor heat exchanger and the second indoor heat exchanger is a first space; an indoor fan, arranged corresponding to the air supply outlet, or arranged in the first space; Wherein, the fresh air inlet is located on the windward side of the first indoor heat exchanger; the return air outlet is connected to the first space; The indoor unit further comprises: A fresh air valve, used to open or close the fresh air inlet; A return air valve, used to open or close the return air port; When the fresh air valve is opened, the indoor fan runs, so that the outdoor fresh air flows to the supply air outlet through the fresh air inlet, the first indoor heat exchanger, and the second indoor heat exchanger; when the return air valve is opened, the indoor fan runs, so that the indoor air flows to the supply air outlet through the return air outlet and the second indoor heat exchanger.

2. The air conditioner according to claim 1, characterized in that: Also includes: compressor, used to compress the refrigerant; An outdoor heat exchanger, used to exchange heat with outdoor air; Four-way valve, used to switch the refrigerant flow direction between cooling mode and heating mode; A first expansion valve and a second expansion valve are used to reduce the pressure of the refrigerant; The outdoor heat exchanger, the first expansion valve, the second indoor heat exchanger, the second expansion valve, and the first indoor heat exchanger are sequentially connected in series in a refrigerant circuit.

3. The air conditioner according to claim 2, characterized in that: Also includes: A first solenoid valve has a first end connected between the second indoor heat exchanger and the second expansion valve, and a second end connected between the first indoor heat exchanger and the four-way valve.

4. The air conditioner according to claim 3, characterized in that: Also includes: A second solenoid valve has a first end connected between the outdoor heat exchanger and the first expansion valve, and a second end connected between the second indoor heat exchanger and the first end of the first solenoid valve.

5. The air conditioner according to claim 1, characterized in that: A bypass channel connecting the fresh air inlet and the air supply outlet is provided in the shell; The bypass channel is provided with: A fresh air fan, used to allow outdoor fresh air to flow into the room along the bypass channel; The bypass valve is used to open or close the bypass channel.

6. The air conditioner according to claim 1, characterized in that: The indoor unit further comprises: a first water receiving pan, used to collect condensed water from the first indoor heat exchanger; a second water receiving pan, used to collect condensed water from the second indoor heat exchanger; A drainage pump, used to drain condensed water from the first water receiving tray and the second water receiving tray; A bypass channel connecting the fresh air inlet and the air supply port is provided in the shell; the drainage pump is arranged in the bypass channel.

7. The air conditioner according to claim 1, characterized in that: Also includes: An outdoor heat exchanger, used to exchange heat with outdoor air; The water-refrigerant heat exchanger has a refrigerant channel and a water channel, wherein the refrigerant channel is connected in parallel with the outdoor heat exchanger in a refrigerant circuit.

8. The air conditioner according to claim 7, characterized in that: Also includes: A third solenoid valve is connected in series to the branch where the outdoor heat exchanger is located; The fourth solenoid valve is connected in series to the branch where the water-refrigerant heat exchanger is located.

9. The air conditioner according to claim 7, characterized in that: The indoor unit further comprises: a first water receiving pan, used to collect condensed water from the first indoor heat exchanger; a second water receiving pan, used to collect condensed water from the second indoor heat exchanger; The first water receiving pan and the second water receiving pan are both connected to the inlet end of the water-refrigerant heat exchanger through a pipeline, so that the condensed water flows to the water-refrigerant heat exchanger.

10. An air conditioner, characterized in that: Including indoor unit; The indoor unit comprises: A shell, with fresh air inlet and air supply outlet respectively arranged at two opposite ends thereof, and a return air outlet arranged on the bottom surface of the shell; A first indoor heat exchanger and a second indoor heat exchanger are arranged in the shell, the second indoor heat exchanger is closer to the air outlet than the first indoor heat exchanger, and the interval space between the first indoor heat exchanger and the second indoor heat exchanger is a first space; an indoor fan, arranged corresponding to the air supply outlet, or arranged in the first space; Wherein, the fresh air inlet is located on the windward side of the first indoor heat exchanger; the return air outlet is connected to the first space; The indoor unit further comprises: A fresh air valve, used to open or close the fresh air inlet; A return air valve, used to open or close the return air port; When the fresh air valve is opened, the indoor fan runs, so that the outdoor fresh air flows to the supply air outlet through the fresh air inlet, the first indoor heat exchanger, and the second indoor heat exchanger; when the return air valve is opened, the indoor fan runs, so that the indoor air flows to the supply air outlet through the return air outlet and the second indoor heat exchanger.

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