CN112797497A - Air conditioner indoor unit and air conditioner - Google Patents

Abstract

The invention discloses an air conditioner indoor unit and an air conditioner, wherein the air conditioner indoor unit comprises a first indoor heat exchanger and a second indoor heat exchanger, wherein the first indoor heat exchanger is provided with a first through opening and a second through opening for allowing a refrigerant to enter or flow out, the first through opening is configured to be communicated with a first pipe of the air conditioner, and the second through opening is configured to be communicated with a third pipe of the air conditioner and/or configured to be communicated with a second pipe of the air conditioner; the second indoor heat exchanger is provided with a third through hole and a fourth through hole for the refrigerant to enter or flow out of the second indoor heat exchanger, the third through hole is communicated with the first pipe of the air conditioner, and the fourth through hole is communicated with the third pipe of the air conditioner and/or is communicated with the second pipe of the air conditioner; the third through opening is communicated with a first matching pipe of the air conditioner through a second refrigerant pipe, and a second indoor throttling device is arranged on the second refrigerant pipe. The technical scheme of the invention improves the adaptability of the air conditioner.

Description

Air conditioner indoor unit and air conditioner

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioner indoor unit and an air conditioner.

Background

Along with the improvement of living standard of people, people are more and more common to the use of air conditioner, and simultaneously, people also put forward higher demand to the air conditioner. The existing indoor unit of the air conditioner has the advantages that due to the fixed arrangement of the indoor heat exchangers, the working conditions among the indoor heat exchangers are inflexible, the indoor unit of the air conditioner is not beneficial to the realization of multiple working modes of the air conditioner, and the requirements of different people can not be met.

Disclosure of Invention

The invention mainly aims to provide an air conditioner indoor unit, aiming at improving the adaptability of an air conditioner.

In order to achieve the above object, the present invention provides an indoor unit of an air conditioner, comprising a first indoor heat exchanger and a second indoor heat exchanger, wherein,

the first indoor heat exchanger is provided with a first through port and a second through port for the refrigerant to enter or flow out, the first through port is configured to be communicated with a first pipe of the air conditioner, and the second through port is configured to be communicated with a third pipe of the air conditioner and/or configured to be communicated with a second pipe of the air conditioner;

the second indoor heat exchanger is provided with a third through hole and a fourth through hole for allowing refrigerant to enter or flow out of the second indoor heat exchanger, the third through hole is configured to be communicated with a first pipe of the air conditioner, and the fourth through hole is configured to be communicated with a third pipe of the air conditioner and/or configured to be communicated with a second pipe of the air conditioner; the third through hole is communicated with a first pipe of the air conditioner through a second refrigerant pipe, and a second indoor throttling device is arranged on the second refrigerant pipe;

the air conditioner comprises a compressor, an outdoor heat exchanger, a discharge pipe connected with the discharge side of the compressor, and a suction pipe connected with the low-pressure suction inlet of the compressor;

a first piping configured to connect a discharge pipe, an outdoor heat exchanger, and an indoor heat exchanger of the indoor unit of the air conditioner in this order;

a second pipe configured to connect the suction pipe and the indoor heat exchanger;

the third pipe is configured to connect the discharge pipe and the indoor heat exchanger.

Optionally, the first through opening is communicated with a first pipe of the air conditioner through a first refrigerant pipe, and a first indoor throttling device is arranged on the first refrigerant pipe.

Optionally, the second through port is communicated with a third pipe of the air conditioner through a first connecting pipe, and a first control valve is arranged on the first connecting pipe;

the second through port is communicated with a second pipe of the air conditioner through a second connecting pipe, and a second control valve is arranged on the second connecting pipe.

Optionally, the first connecting pipe is communicated with the second connecting pipe and then communicated with the second through port through the first communicating pipe.

Optionally, the first connecting pipe and the second connecting pipe are communicated and then communicated with the second through port through a first communicating pipe, and a second three-way valve is arranged at a joint of the first connecting pipe, the second connecting pipe and the first communicating pipe to realize the communication between the first communicating pipe and the first connecting pipe and/or the second connecting pipe.

Optionally, the fourth through port is communicated with a third pipe of the air conditioner through a third connecting pipe, and a third control valve is arranged on the third connecting pipe;

the fourth through port is communicated with a second pipe of the air conditioner through a fourth connecting pipe, and a fourth control valve is arranged on the fourth connecting pipe.

Optionally, the third connecting pipe and the fourth connecting pipe are communicated and then communicated with the fourth through port through a second communicating pipe.

Optionally, after the third connecting pipe and the fourth connecting pipe are communicated, the third connecting pipe and the fourth connecting pipe are communicated through a second communicating pipe and a fourth through port, and a third three-way valve is arranged at the joint of the third connecting pipe, the fourth connecting pipe and the second communicating pipe so as to realize the communication between the second communicating pipe and the third connecting pipe and/or the fourth connecting pipe.

The present invention further provides an air conditioner, comprising:

an air-conditioning indoor unit;

the outdoor unit of the air conditioner comprises a compression mechanism and an outdoor heat exchanger;

a discharge pipe connected to a discharge side of the compression mechanism, a suction pipe connected to a suction side of the compression mechanism, and a first pipe connecting the discharge pipe, an outdoor heat exchanger, and one or more indoor heat exchangers of the indoor unit of the air conditioner in this order;

a second pipe connecting the one or more indoor heat exchangers and the suction pipe; and the number of the first and second groups,

a third pipe connecting the one or more indoor heat exchangers and the discharge pipe;

wherein, the heat exchanger comprises a first indoor heat exchanger and a second indoor heat exchanger,

the first indoor heat exchanger is provided with a first through port and a second through port for the refrigerant to enter or flow out, the first through port is configured to be communicated with a first pipe of the air conditioner, and the second through port is configured to be communicated with a third pipe of the air conditioner and/or configured to be communicated with a second pipe of the air conditioner;

the second indoor heat exchanger is provided with a third through hole and a fourth through hole for allowing refrigerant to enter or flow out of the second indoor heat exchanger, the third through hole is configured to be communicated with a first pipe of the air conditioner, and the fourth through hole is configured to be communicated with a third pipe of the air conditioner and/or configured to be communicated with a second pipe of the air conditioner; the third through opening is communicated with a first matching pipe of the air conditioner through a second refrigerant pipe, and a second indoor throttling device is arranged on the second refrigerant pipe.

Optionally, the air conditioner further comprises a switcher, the switcher being switchable between a switcher first switching state and a switcher second switching state;

in the first switching state, the switch causes the first pipe to communicate with the suction pipe and causes the second pipe to communicate with the discharge pipe;

in the second switching state, the switch connects the first pipe to the discharge pipe and connects the second pipe to the suction pipe.

Optionally, the number of the air-conditioning indoor units is multiple, and the multiple air-conditioning indoor units are connected to the first pipe, the second pipe and the third pipe in parallel;

alternatively, the plurality of indoor heat exchangers are connected in parallel to the first pipe and the second pipe.

Optionally, the outdoor unit of the air conditioner further comprises an economizer; the economizer is arranged on a first pipe between the outdoor heat exchanger and the indoor unit, and a return pipe of the economizer is communicated with a medium-pressure suction inlet of the compressor.

Optionally, a first refrigerant flow path and a second refrigerant flow path are arranged in the economizer, and two ends of the first refrigerant flow path are respectively communicated with first pipes at two ends of the economizer; one end of the second refrigerant flow path is communicated with the first pipe through a liquid taking pipe, and the other end of the second refrigerant flow path is communicated with a medium-pressure suction inlet of the compressor through a return pipe; and a liquid taking throttle valve is arranged on the liquid taking pipe.

Optionally, the inflow end of the liquid taking pipe is communicated with a first pipe between the economizer and the outdoor side heat exchanger, or,

and the inflow end of the liquid taking pipe is communicated with a first pipe between the economizer and the indoor unit.

Optionally, the return pipe comprises a return pipe body, a first conducting pipe and a second conducting pipe;

one end of the first communicating pipe is communicated with the muffler body, and the other end of the first communicating pipe is communicated with a medium-pressure suction inlet of the compressor; a fifth control valve is arranged on the return pipe body or the first return pipe;

one end of the second conduction pipe is communicated with the muffler body, the other end of the second conduction pipe is communicated with the suction pipe, and a sixth control valve is arranged on the second conduction pipe.

According to the technical scheme, when a first pipe is sequentially connected with a discharge pipe, an outdoor heat exchanger and a first through port of a first indoor heat exchanger, and a second pipe is connected with a suction pipe and a second through port of the first indoor heat exchanger, the first indoor heat exchanger refrigerates; when the first piping connects the discharge pipe, the outdoor heat exchanger, and the fourth port of the second indoor heat exchanger in this order, and the second piping connects the suction pipe and the third port of the second indoor heat exchanger, the second indoor heat exchanger heats. Therefore, the air passes through the first refrigerating indoor heat exchanger and the second heating indoor heat exchanger, so that the indoor unit of the air conditioner realizes dehumidification and reheating; when the first indoor heat exchanger refrigerates and the second heat exchanger refrigerates, the indoor unit of the air conditioner realizes refrigeration; the air-conditioning indoor unit can realize dehumidification and reheating to deal with the damp 'return south' and can meet the refrigeration requirement of a user; the effects of refrigeration and dehumidification reheating of the indoor heat exchanger can be more finely adjusted, so that the air conditioner can be suitable for more occasions, the requirements of different people are met, and the improvement of the adaptability of the air conditioner is facilitated.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is an enlarged view of the structure at B in FIG. 1;

FIG. 4 is an enlarged view of the structure at C in FIG. 1;

FIG. 5 is a schematic structural diagram of an air conditioner according to another embodiment of the present invention;

FIG. 6 is a schematic diagram of the internal structure of an economizer in an air conditioner according to an embodiment of the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

The invention mainly provides an air conditioner indoor unit 200 which is mainly applied to an air conditioner, so that the air conditioner indoor unit 200 comprises a plurality of parallel indoor heat exchangers, and the total heat exchange area of the indoor heat exchangers can be adjusted according to needs to meet different working condition requirements.

The specific structure of the air conditioning indoor unit 200 will be mainly described below.

Referring to fig. 1 to 6, in the embodiment of the present invention, the indoor unit 200 of the air conditioner includes two indoor heat exchangers, i.e., a first indoor heat exchanger 210 and a second indoor heat exchanger 220, wherein,

the first indoor heat exchanger 210 has a first through port 211 and a second through port 212 for allowing the refrigerant to enter or exit the first indoor heat exchanger 210, the first through port 211 is configured to communicate with the first pipe 140 of the air conditioner, and the second through port 212 is configured to communicate with the third pipe 160 of the air conditioner and/or configured to communicate with the second pipe 150 of the air conditioner;

the second indoor heat exchanger 220 has a third through hole 221 and a fourth through hole 222 for allowing the refrigerant to enter or exit the second indoor heat exchanger 220, the third through hole 221 is configured to communicate with the first pipe 140 of the air conditioner, and the fourth through hole 222 is configured to communicate with the third pipe 160 of the air conditioner and/or configured to communicate with the second pipe 150 of the air conditioner; the third through port 221 is communicated with the first pipe 140 of the air conditioner through a second refrigerant pipe 223, and the second refrigerant pipe 223 is provided with a second indoor throttling device 240;

the air conditioner includes a compressor 110 and an outdoor heat exchanger 141, a discharge pipe 111 connected to the discharge side of the compressor 110, and a suction pipe connected to the low pressure suction port of the compressor 110;

the first pipe 140 is configured to connect the discharge pipe 111, the outdoor heat exchanger 141, and the indoor heat exchanger of the indoor unit 200 of the air conditioner in this order;

the second pipe 150 is configured to connect the suction pipe and the indoor heat exchanger;

third pipe 160 is disposed to connect discharge pipe 111 and the indoor heat exchanger.

Specifically, in the present embodiment, the air conditioning indoor unit 200 includes a plurality of indoor heat exchangers, and two of them are taken as an example for description. The first inlet 211 of the first indoor heat exchanger 210 communicates with the first pipe 140 of the air conditioner, and the second inlet 212 communicates with the third pipe 160 or the second pipe 150. When the refrigerant enters the first indoor heat exchanger 210 from the first outlet 211 and flows out of the first indoor heat exchanger 210 from the second outlet 212, the first indoor heat exchanger 210 cools (in some embodiments of the multi-split air conditioner, heating may also be performed, and may be achieved by adjusting a throttle adjusting device); when the refrigerant enters the first indoor heat exchanger 210 through the second outlet 212 and flows out of the first indoor heat exchanger 210 through the first outlet 211, the first indoor heat exchanger 210 heats. When the first indoor heat exchanger 210 performs cooling, the refrigerant flows from the compressor 110, passes through the outdoor heat exchanger 141 under the guidance of the first pipe 140, enters the first indoor heat exchanger 210 through the first port 211, flows out of the first indoor heat exchanger 210 through the second port 212, returns to the gas-liquid separator 120 or the suction pipe through the second pipe 150, and flows back to the compressor 110. When the first indoor heat exchanger 210 performs heating, the refrigerant flows in two ways, the first being discharged from the compressor 110, then enters the second pipe 150 through the discharge pipe 111, enters the first indoor heat exchanger 210 through the second opening 212, then flows out of the first indoor heat exchanger 210 through the first opening 211, flows into the outdoor heat exchanger 141 through the first pipe 140, passes through the outdoor heat exchanger 141, then flows into the suction pipe through the first pipe 140, and flows back to the compressor 110. In the second type, the refrigerant flows out from the compressor 110, flows into the third pipe 160 through the discharge pipe, enters the first indoor heat exchanger 210 through the second port 212, flows out of the first indoor heat exchanger 210 through the first port 211, flows into the outdoor heat exchanger 141 through the first pipe 140, flows into the suction pipe through the outdoor heat exchanger 141, and flows back to the compressor 110 through the first pipe 140. The first and second modes may occur at the same time in the same heat exchanger.

Similarly, the third port 221 of the second indoor heat exchanger 220 communicates with the first pipe 140 of the air conditioner, and the fourth port 222 communicates with the third pipe 160 or the second pipe 150. When the refrigerant enters the second indoor heat exchanger 220 from the third opening 221 and flows out of the second indoor heat exchanger 220 from the fourth opening 222, the second indoor heat exchanger 220 performs cooling (in some embodiments of the multi-split air conditioner, heating may also be performed, and may be achieved by adjusting the throttle adjusting device); when the refrigerant enters the second indoor heat exchanger 220 through the fourth outlet 222 and flows out of the second indoor heat exchanger 220 through the third outlet 221, the second indoor heat exchanger 220 heats. When the second indoor heat exchanger 220 performs cooling, the refrigerant flows from the compressor 110, passes through the outdoor heat exchanger 141 under the guidance of the first pipe 140, enters the second indoor heat exchanger 220 through the third port 221, flows out of the second indoor heat exchanger 220 through the fourth port 222, flows back to the gas-liquid separator 120 or the suction pipe through the second pipe 150, and flows back to the compressor 110. When the second indoor heat exchanger 220 performs heating, the refrigerant flows in two ways, the first way is that the refrigerant is discharged from the compressor 110, enters the second pipe 150 through the discharge pipe 111, enters the second indoor heat exchanger 220 through the fourth opening 222, flows out of the second indoor heat exchanger 220 through the third opening 221, flows into the outdoor heat exchanger 141 through the first pipe 140, flows into the suction pipe through the outdoor heat exchanger 141, and flows back to the compressor 110 through the first pipe 140. In the second type, the refrigerant flows out from the compressor 110, flows into the third pipe 160 through the discharge pipe, enters the second indoor heat exchanger 220 through the fourth port 222, flows out of the second indoor heat exchanger 220 through the third port 221, flows into the outdoor heat exchanger 141 through the first pipe 140, flows into the suction pipe through the outdoor heat exchanger 141, and flows back to the compressor 110 through the first pipe 140. The opening and closing of the second indoor throttling device 240 controls whether the second indoor heat exchanger 220 is engaged in operation.

In this way, when the discharge pipe 111, the outdoor heat exchanger 141, and the first inlet 211 of the first indoor heat exchanger 210 are connected in order to the first pipe 140, and the suction pipe and the second inlet 212 of the first indoor heat exchanger 210 are connected to the second pipe 150, the first indoor heat exchanger 210 cools; when the discharge pipe 111, the outdoor heat exchanger 141, and the fourth port 222 of the second indoor heat exchanger 220 are connected in this order to the first pipe 140, and the suction pipe and the third port 221 of the second indoor heat exchanger 220 are connected to the second pipe 150, the second indoor heat exchanger 220 heats. Thus, the air passes through the first indoor heat exchanger 210 for cooling and then passes through the second indoor heat exchanger 220 for heating, so that the indoor unit 200 of the air conditioner realizes dehumidification and reheating; when the first indoor heat exchanger 210 refrigerates and the second heat exchanger refrigerates, the indoor unit 200 of the air conditioner realizes refrigeration; the air-conditioning indoor unit 200 can realize dehumidification and reheating to cope with humid 'return south' and can meet the refrigeration requirement of a user; the effects of refrigeration and dehumidification reheating of the indoor heat exchanger can be more finely adjusted, so that the air conditioner can be suitable for more occasions, the requirements of different people are met, and the improvement of the adaptability of the air conditioner is facilitated.

In some embodiments, in order to further improve the adaptability of the air conditioner, the first through opening 211 is communicated with the first pipe 140 of the air conditioner through a first refrigerant pipe 213, and the first indoor throttling device 230 is disposed on the first refrigerant pipe 213. The first indoor throttling device 230 is disposed on the first refrigerant pipe 213, so that the first indoor heat exchanger 210 may be in a non-operating state, and a position of an operating indoor heat exchanger among the plurality of indoor heat exchangers may be arbitrarily selected according to a requirement.

For controlling the opening and closing of the first refrigerant pipe 213 and the second refrigerant pipe 223, a dedicated control valve may be provided in addition to the first throttle device 230 and the second indoor throttle device 240 for adjusting the flow rate. The air conditioner further includes a first three-way valve through which the first pipe 140 communicates with the first refrigerant pipe 213 and the second refrigerant pipe 223, respectively. In some embodiments, in order to improve the convenience of installing the first pipe 140 and the first and second refrigerant pipes 213 and 223 and to improve the compactness, a three-way valve is used to communicate the first pipe 140 and the refrigerant pipes. In this case, the three-way valve may not have a control function, and only needs to communicate the first pipe 140 with the first and second refrigerant pipes 223, respectively. In other embodiments, in order to further improve the on-off control between the first pipe 140 and the first refrigerant pipe 213, and between the second refrigerant pipe 223 and the third refrigerant pipe, the first three-way valve may have a function of opening and closing the pipe ports. For example, two nozzles of the first refrigerant pipe 213 and the second refrigerant pipe 223 may be opened and closed, respectively.

When the third pipe 160 and the second pipe 150 are simultaneously connected to the second port 212 and the third pipe 160 and the second pipe 150 are simultaneously connected to the fourth port 222, there are various methods of controlling the first connection pipe 215, the second connection pipe 216, the third connection pipe 225, and the fourth connection pipe 226, respectively. Control valves may be respectively disposed on the first connection pipe 215, the second connection pipe 216, the third connection pipe 225, and the fourth connection pipe 226, or a second three-way valve and a third three-way valve may be respectively disposed.

The second inlet 212 communicates with the third pipe 160 of the air conditioner via a first connection pipe 215, and the first connection pipe 215 is provided with a first control valve 217; the second through port 212 communicates with the second pipe 150 of the air conditioner via a second connection pipe 216, and the second connection pipe 216 is provided with a second control valve 218. In this way, the second port 212 can selectively communicate with the third pipe 160 or the second pipe 150, so that the operating state of the first indoor heat exchanger 210 can be arbitrarily adjusted according to the requirement, and is not affected by the operating modes of other indoor heat exchangers. For example, when the overall indoor unit 200 needs to perform the reheat and dehumidification functions, some indoor heat exchangers are required to heat and some indoor heat exchangers are required to cool. The first indoor heat exchanger 210 cools and the second indoor heat exchanger heats, for example. In the first indoor heat exchanger, the refrigerant at this time passes through the outdoor heat exchanger 141 via the first pipe 140, is sent to the second indoor heat exchanger 220 via the first pipe 140 to be cooled, and is sent back to the suction pipe via the second pipe 150. At this time, the second indoor heat exchanger 220 needs to be heated, and the refrigerant flows from the discharge pipe 111, into the second port 212 through the third pipe 160 and the first connecting pipe 215, flows out of the first port 211, enters the first pipe 140, and flows into the suction pipe through the first pipe 140. During this process, the second control valve 218 is opened and the first control valve 217 is closed. Therefore, the first indoor heat exchanger 210 can realize a working state different from that of other heat exchangers, which is beneficial to improving the use occasion of the first indoor heat exchanger 210. When the first indoor heat exchanger 210 heats, the second control valve 218 is closed and the first control valve 217 is opened.

Similarly, the fourth through port 222 communicates with the third pipe 160 of the air conditioner via a third connection pipe 225, and the third connection pipe 225 is provided with a third control valve 227; the fourth port 222 communicates with the second pipe 150 of the air conditioner via a fourth connection pipe 226, and the fourth connection pipe 226 is provided with a fourth control valve 228. In this way, the fourth port 222 is selectively communicated with the third pipe 160 or the second pipe 150, so that the operating state of the second indoor heat exchanger 220 can be arbitrarily adjusted according to the requirement, and is not affected by the operating modes of other indoor heat exchangers. When the second indoor heat exchanger 220 performs cooling, the third control valve 227 is closed, and the fourth control valve 228 is opened; when the second indoor heat exchanger 220 performs heating, the third control valve 227 is opened and the fourth control valve 228 is closed, or the third control valve 227 is closed and the fourth control valve 228 is opened (in the case of heating the second indoor heat exchanger 220 in the above embodiment, it is necessary that the second pipe 150 communicates with the discharge pipe 111 and the first pipe 140 communicates with the suction pipe).

The situation is realized by the form of a three-way valve:

the second inlet 212 communicates with the third pipe 160 of the air conditioner via the first connection pipe 215, and communicates with the second pipe 150 via the second connection pipe 216, and the second pipe 150 and the third pipe 160 can communicate with the second inlet 212 after being connected via the first connection pipe 214; the air conditioner further includes a second three-way valve through which the first connection pipe 214 communicates with the first connection pipe 215 and the second connection pipe 216, respectively.

Specifically, in this embodiment, one end of the first communication pipe 214 is communicated with the second port 212, and the other end is communicated with a second three-way valve, the first communication pipe 214 is respectively communicated with the first connection pipe 215 and the second connection through the second three-way valve, and the ports of the second three-way valve respectively connected with the two connection pipes can be controlled to be opened and closed. In this manner, the on/off of the first connection pipe 215 and the second connection pipe 216 can be controlled by the second three-way valve. The connection of the first connecting pipe 214, the first connecting pipe 215 and the second connecting pipe 216 is facilitated, and meanwhile the connection and disconnection of the two connecting pipes can be conveniently controlled.

The fourth through port 222 communicates with the third pipe 160 of the air conditioner via a third connecting pipe, and the fourth through port 222 communicates with the second pipe 150 via a fourth connecting pipe 226; the third connection pipe 225 and the fourth connection pipe 226 are communicated with the fourth port 222 through the second communication pipe 224. The air conditioner further includes a third three-way valve through which the second communication pipe 224 is communicated with the third and fourth connection pipes 226, respectively.

Specifically, in this embodiment, one end of the second communication pipe 224 is communicated with the fourth through port 222, and the other end is communicated with the third three-way valve, that is, the second communication pipe is communicated with the third connection pipe and the fourth connection pipe through the third three-way valve, and the ports of the third three-way valve, which are respectively connected with the two connection pipes, can be controlled to be opened and closed. In this way, the third connection pipe and the fourth connection pipe 226 can be opened and closed by the third three-way valve. The on-off control of the two connecting pipes can be conveniently realized while the convenient connection of the fourth through opening 222 and the third and fourth connecting pipes 226 is facilitated.

Note that, regarding the connection form of the third pipe 160 and the first connection pipe 215 and the third connection pipe 225, the first connection pipe 215 and the third connection pipe 225 may be connected to the third pipe 160 independently of each other, or may be connected to the third pipe 160 after a plurality of pipes are connected. For example, after the first connection pipe 215 and the third connection pipe 225 are connected to each other, the third connection pipe is connected to the third pipe 160.

Similarly, as for the connection mode of the second pipe 150 and the second and fourth connection pipes 216 and 226, the second and fourth connection pipes 216 and 226 may be independently connected to the second pipe 150, or may be connected to the second pipe 150 after being connected to a plurality of pipes. For example, after the second connection pipe 216 and the fourth connection pipe 226 are connected to each other, the fourth connection pipe is connected to the second pipe 150.

The present invention further provides an air conditioner, which includes an outdoor unit 100 and an indoor unit 200, and the specific structure of the indoor unit 200 refers to the above embodiments, and since the air conditioner employs all technical solutions of all the above embodiments, the air conditioner at least has all the beneficial effects brought by the technical solutions of the above embodiments, and details are not repeated herein. The outdoor unit 100 of the air conditioner includes a compressor 110 and an outdoor heat exchanger 141; a discharge pipe 111 connected to a discharge side of the compressor 110, a suction pipe connected to a suction side of the compressor 110, and a first pipe 140 sequentially connecting the discharge pipe 111, the outdoor heat exchanger 141, and one or more indoor heat exchangers of the indoor air conditioner 200; a second pipe 150 connecting the one or more indoor heat exchangers and the suction pipe; and a third pipe 160, the third pipe 160 connecting one or more indoor heat exchangers and the discharge pipe 111.

In some embodiments, to improve the flexibility of the system, the air conditioner further includes a switch 131, the switch 131 can be switched between a first switching state of the switch 131 and a second switching state of the switch 131,

in the first switching state, the switch 131 causes the first pipe 140 to communicate with the suction pipe and the second pipe 150 to communicate with the discharge pipe 111;

in the second switching state, the switch 131 allows the first pipe 140 to communicate with the discharge pipe 111 and the second pipe 150 to communicate with the suction pipe.

In this way, the first pipe 140 may convey the high-temperature and high-pressure refrigerant in the discharge pipe 111 to the outdoor heat exchanger 141 (the first pipe 140 communicates with the discharge pipe 111), or may return the low-temperature and low-pressure refrigerant flowing out of the outdoor heat exchanger 141 to the compressor 110 (the first pipe 140 communicates with the suction pipe).

In some embodiments, the air conditioner further includes a plurality of indoor units 200, and the heat exchanger types included in each indoor unit 200 may be different, such as an indoor unit with dehumidification and reheating functions (including both the first indoor heat exchanger 210 and the second indoor heat exchanger 220), an ordinary cooling/heating indoor unit (including only one heat exchanger and a corresponding throttling device), and an indoor unit with a switching device capable of freely switching cooling or heating states, so that the air conditioner can simultaneously perform hybrid operations of dehumidification and reheating, cooling, heating, temperature rise and dehumidification, and the like.

Specifically, the number of the air-conditioning indoor units 200 is plural, and the plural air-conditioning indoor units 200 are connected in parallel to the first pipe 140, the second pipe 150, and the third pipe 160; alternatively, a plurality of indoor heat exchangers are connected in parallel to the first pipe 140 and the second pipe 150. The first pipe 140, the second pipe 150, and the third pipe 160 continue to extend so that more indoor units 200 can be connected. The indoor heat exchanger may be connected to the refrigerant system in various manners, such as a conventional connection manner, in which two refrigerant inlets of the heat exchanger are respectively communicated with the first pipe 140 and the second pipe 150, or may be connected to the first pipe 140 via one refrigerant inlet and the second pipe 150 and the third pipe 160 via the other refrigerant inlet as in the heat exchanger of the above embodiment. At this time, not only can the refrigerant interaction be realized between the same indoor unit 200, but also the refrigerant interaction can be realized between different indoor units 200, thereby greatly improving the utilization rate and flexibility of the refrigerant cycle, so that the indoor unit 200 of the air conditioner can realize more functions and meet the requirements of different people.

In some embodiments, to improve the ability of the air conditioner to heat at low temperatures, the air conditioner further comprises an economizer 143; the economizer 143 is provided in the first pipe 140 between the outdoor heat exchanger and the indoor unit 200, and a return pipe 146 of the economizer 143 communicates with the medium-pressure suction port of the compressor 110. The return pipe 146 may have various forms, and the return pipe 146 may include only a return pipe body, or may include the return pipe body 146 and a first conduction pipe 148, and one end of the first conduction pipe 148 is communicated with the return pipe body 146, and the other end is communicated with the medium-pressure suction port of the compressor 110.

A fifth control valve 133 is provided in the return line 146 or in a first conduction pipe 148 between the return line 146 and the medium-pressure suction port of the compressor 110. The compressor 110 in this case is a vapor injection enthalpy compressor 110, and has a low pressure suction port and an intermediate pressure suction port.

The economizer 143 has a throttling function, a first refrigerant flow path 143a and a second refrigerant flow path 143b are arranged in the economizer 143, and two ends of the first refrigerant flow path 143a are respectively communicated with the first piping 140 at two ends of the economizer 143; one end of the second refrigerant passage 143b is connected to the first pipe 140 via a liquid taking pipe 145, and the other end is connected to a medium-pressure suction port of the compressor 110 via a return pipe 146; a liquid extraction throttle 144 is provided in the liquid extraction pipe 145. One end of the first refrigerant flow path 143a communicates with a refrigerant inlet of the economizer 143, and the other end communicates with a refrigerant outlet of the economizer 143. The liquid extraction pipe 145 has one end communicating with the first pipe 140 and the other end communicating with the second refrigerant passage 143b, and the return pipe 146 has one end communicating with the medium-pressure suction port of the compressor 110 and the other end communicating with the second refrigerant passage 143 b.

As described above, referring to the refrigerant flow path in the heating mode, the high-temperature and high-pressure refrigerant flows out of the discharge pipe 111 of the compressor 110, passes through the third pipe 160 (via the first connection pipe) or the second pipe 150 (via the second connection pipe), enters the indoor heat exchanger to be heated, and flows through the economizer 143, the outdoor throttle adjusting device 142, the outdoor heat exchanger, and the suction pipe along the first pipe 140 in sequence, and then flows back to the low-pressure suction port of the compressor 110.

The liquid refrigerant enters the economizer 143 and is divided into two parts: the first part directly enters an outdoor heat exchanger for evaporation and heat absorption after being throttled and reduced in pressure by an outdoor throttling adjusting device 142 (an electronic expansion valve), the second part enters an economizer 143 for heat absorption and evaporation after being throttled and reduced in pressure by a liquid taking throttle valve 144 (the electronic expansion valve), the middle-pressure saturated steam after evaporation enters a middle-pressure air suction port of the compressor 110 through a return pipe 146, a fifth control valve 133 and a conduction pipe and is mixed with the refrigerant of a low-pressure air suction port of the compressor 110 for compression, the problems of small refrigerant flow, low return air pressure, high compression ratio and the like in a low-temperature environment are solved, and the reliability of a low-temperature heating capacity and a system is improved. By the technology of the invention, when the outdoor environment temperature is low, the refrigerant suction amount of the compressor 110 in the low-temperature environment is increased through the system design of the enhanced vapor injection compressor 110 and the economizer 143, so that the low-temperature heating capacity is improved, the compression ratio in the low-temperature environment is reduced, and the reliability of the system can be improved.

In order to improve the liquid extraction effect, the inflow end of the liquid extraction pipe 145 is communicated with the first pipe 140 between the economizer 143 and the outdoor heat exchanger, and in other embodiments, the inflow end of the liquid extraction pipe 145 can also be communicated with the first pipe 140 between the economizer 143 and the indoor unit. That is, the refrigerant flows in from the refrigerant outflow end of the economizer 143, which is advantageous for improving the reliability of liquid extraction.

In other embodiments, in order to avoid the unpleasant noise generated when the refrigerant in the vapor-liquid two-phase state passes through the indoor throttling device, the air conditioner further includes a gas-liquid separator 120 and an economizer 143, wherein the gas-liquid separator 120 is disposed on the low-pressure suction pipe 113; the economizer 143 is provided in the first pipe 140 between the outdoor heat exchanger and the first indoor throttle 230, and the return pipe 146 of the economizer 143 communicates with the gas-liquid separator 120. The return pipe 146 may have various forms, and the return pipe 146 may include only the body of the return pipe 146, or may include the body of the return pipe 146 and a second conduit 147, where one end of the second conduit 147 is communicated with the return pipe body 146, and the other end is communicated with the gas-liquid separator 120.

For convenience of control, in some examples, the return pipe 146 is communicated with the gas-liquid separator 120 through the low pressure suction pipe 113, and the sixth control valve 149 is disposed on the return pipe 146 or a second communication pipe between the return pipe 146 and the low pressure suction pipe 113.

The invention further reduces the condensation temperature of the refrigerant at the outlet of the outdoor heat exchanger by adopting the system design with the economizer 143 on the basis of the three-pipe dehumidification reheating scheme and controlling the liquid taking throttle valve 144 (electronic expansion valve) in the system design loop with the economizer 143, improves the supercooling degree, leads the refrigerant to be completely condensed into liquid state, leads the liquid refrigerant to enter the indoor heat exchanger for heat absorption and evaporation after being throttled and decompressed by the indoor electronic expansion valve, and can solve the abnormal sound of the refrigerant generated by the gas-liquid two-phase state when the refrigerant passing through the indoor throttling device is in the full liquid state.

Referring to the refrigeration mode, after the compressor 110 exhausts air and is switched by the switch 131, the high-pressure and high-temperature gaseous refrigerant enters the outdoor heat exchanger for condensation and heat exchange, and the gas-liquid two-phase medium-temperature and high-pressure refrigerant coming out of the outdoor heat exchanger enters the economizer 143 and then is divided into two parts: the first part is throttled and depressurized by the liquid taking throttle valve 144, then enters the economizer 143 through the liquid taking pipe 145 to absorb heat and evaporate, the evaporated gaseous refrigerant enters the air suction port of the compressor 110 through the return pipe 146, the sixth control valve 149 (solenoid valve) and the conduction pipe are mixed with the gaseous refrigerant which is subjected to heat absorption and evaporation by the indoor heat exchanger, the second part is further condensed and heat exchanged from the economizer 143, the gas-liquid two-phase refrigerant is changed into a pure liquid refrigerant, the pure liquid refrigerant flows indoors, and is throttled and depressurized by the first indoor throttling adjusting device and the second indoor throttle valve and then enters the first indoor heat exchanger 210 and the second indoor heat exchanger 220 to absorb heat and evaporate. The refrigerant entering the first throttling regulation device 230 and the second throttling regulation device 240 (electronic expansion valve) changes from a gas-liquid two-phase state to a pure liquid state, so that the problem of refrigerant noise generated when the gas-liquid two-phase refrigerant passes through the throttling device is solved.

In this embodiment, according to the technical scheme of the present invention, the condensation temperature of the refrigerant at the outlet of the outdoor heat exchanger can be further reduced, the supercooling degree is increased, the refrigerant is completely condensed from a gas-liquid two-phase state to a liquid state, the liquid refrigerant enters the indoor heat exchanger to absorb heat and evaporate after being throttled and depressurized by the indoor electronic expansion valve (the first throttle adjusting device 230 and the second throttle adjusting device 240), and when the refrigerant passing through the indoor throttle device (the first throttle adjusting device 230 and the second throttle adjusting device 240) is in a full liquid state, the problem of refrigerant abnormal sound generated by the gas-liquid two-phase refrigerant passing through the throttle device can be solved, so as to improve the satisfaction degree of users

It should be noted that in some embodiments, the return pipe 146 is connected to the intermediate-pressure suction port of the compressor 110 and the gas-liquid separator 120 through different conduits, and in this case, the fifth control valve 133 (close to the compressor 110) and the sixth control valve 149 (close to the gas-liquid separator 120) are respectively disposed on the two conduits (the first conduit 148 and the second conduit 147). The return pipe 146 in this case includes the body of the return pipe 146 and two conduits. In the heating mode, the sixth control valve 149 is closed, and the fifth control valve 133 is opened, so that the refrigerant flows into the compressor 110, thereby improving the heating capacity; and in the cooling mode or the constant-temperature dehumidification mode, the fifth control valve is closed, and the sixth control valve is opened to eliminate abnormal sound. Of course, in some embodiments, the sixth control valve 149 may be closed and the fifth control valve 133 may be opened as required by particular operating conditions. The arrangement is such that the air conditioner can adjust the fifth control valve 133 and the sixth control valve according to specific conditions, thereby improving the heating capacity of the air conditioner in the heating mode and reducing noise in the cooling and constant temperature dehumidification modes.

Regarding the specific connection between the compressor 110 and the economizer 143, the compressor 110 is an enhanced vapor injection compressor 110, and the compressor 110 has a conventional high pressure discharge port P, a low pressure suction port S, and a medium pressure suction port M (i.e., a vapor injection port) through which medium pressure refrigerant vapor enters the compressor 110 to increase the effective flow rate of the refrigerant.

The port a of the economizer 143 is connected with one end of the outdoor heat exchanger, the port b of the economizer 143 is connected with the indoor unit, the port c of the economizer 143 is connected with the liquid taking pipe 145, the port d of the economizer 143 is connected with the return pipe 146, the liquid taking throttle valve 144 is connected in series with the liquid taking pipe 145, the fifth control valve is connected in series with the first conduction pipe, the sixth control valve is connected in series with the sixth conduction pipe, one end of the first conduction pipe is connected with the medium-pressure suction port M of the compressor 110, and the second conduction pipe is connected with the inlet end of the gas-liquid separator 120.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (15)

1. An indoor unit of air conditioner for air conditioner is composed of the first indoor heat exchanger and the second indoor heat exchanger,

the first indoor heat exchanger is provided with a first through port and a second through port for the refrigerant to enter or flow out, the first through port is configured to be communicated with a first pipe of the air conditioner, and the second through port is configured to be communicated with a third pipe of the air conditioner and/or configured to be communicated with a second pipe of the air conditioner;

the second indoor heat exchanger is provided with a third through hole and a fourth through hole for allowing refrigerant to enter or flow out of the second indoor heat exchanger, the third through hole is configured to be communicated with a first pipe of the air conditioner, and the fourth through hole is configured to be communicated with a third pipe of the air conditioner and/or configured to be communicated with a second pipe of the air conditioner; the third through hole is communicated with a first pipe of the air conditioner through a second refrigerant pipe, and a second indoor throttling device is arranged on the second refrigerant pipe;

the air conditioner comprises a compressor, an outdoor heat exchanger, a discharge pipe connected with the discharge side of the compressor, and a suction pipe connected with the low-pressure suction inlet of the compressor;

a first piping configured to connect a discharge pipe, an outdoor heat exchanger, and an indoor heat exchanger of the indoor unit of the air conditioner in this order;

a second pipe configured to connect the suction pipe and the indoor heat exchanger;

the third pipe is configured to connect the discharge pipe and the indoor heat exchanger.

2. The indoor unit of claim 1, wherein the first outlet is connected to a first pipe of the air conditioner through a first refrigerant pipe, and the first refrigerant pipe is provided with a first indoor throttle device.

3. The indoor unit of claim 1, wherein the second port is connected to a third pipe of the air conditioner through a first connection pipe, and the first connection pipe is provided with a first control valve;

the second through port is communicated with a second pipe of the air conditioner through a second connecting pipe, and a second control valve is arranged on the second connecting pipe.

4. The indoor unit of an air conditioner according to claim 3, wherein the first connection pipe and the second connection pipe are connected to each other and then connected to the second outlet through a first connection pipe.

5. The indoor unit of claim 1, wherein the first connection pipe and the second connection pipe are connected to each other and then connected to the second inlet through a first connection pipe, and a second three-way valve is provided at a connection point of the first connection pipe, the second connection pipe and the first connection pipe to allow the first connection pipe to be connected to the first connection pipe and/or the second connection pipe.

6. The indoor unit of claim 1, wherein the fourth port is connected to a third pipe of the air conditioner through a third connection pipe, and a third control valve is provided on the third connection pipe;

the fourth through port is communicated with a second pipe of the air conditioner through a fourth connecting pipe, and a fourth control valve is arranged on the fourth connecting pipe.

7. The indoor unit of claim 6, wherein the third connection pipe and the fourth connection pipe are connected to each other and then connected to the fourth port through a second connection pipe.

8. The indoor unit of claim 1, wherein the third connection pipe and the fourth connection pipe are connected to each other and then connected to the fourth port through a second connection pipe, and a third three-way valve is provided at a connection point of the third connection pipe, the fourth connection pipe and the second connection pipe to allow the second connection pipe to be connected to the third connection pipe and/or the fourth connection pipe.

9. An air conditioner, comprising:

the indoor unit of an air conditioner according to any one of claims 1 to 8;

the outdoor unit of the air conditioner comprises a compression mechanism and an outdoor heat exchanger;

a discharge pipe connected to a discharge side of the compression mechanism, a suction pipe connected to a suction side of the compression mechanism, and a first pipe connecting the discharge pipe, an outdoor heat exchanger, and one or more indoor heat exchangers of the indoor unit of the air conditioner in this order;

a second pipe connecting the one or more indoor heat exchangers and the suction pipe; and the number of the first and second groups,

and a third pipe connecting the one or more indoor heat exchangers and the discharge pipe.

10. The air conditioner of claim 9, further comprising a switch capable of switching between a first switch state and a second switch state;

in the first switching state, the switch causes the first pipe to communicate with the suction pipe and causes the second pipe to communicate with the discharge pipe;

in the second switching state, the switch connects the first pipe to the discharge pipe and connects the second pipe to the suction pipe.

11. The air conditioner according to claim 9, wherein the number of the air conditioning indoor units is plural, and the plural air conditioning indoor units are connected in parallel to a first pipe, a second pipe, and a third pipe;

alternatively, the plurality of indoor heat exchangers are connected in parallel to the first pipe and the second pipe.

12. The outdoor unit of claim 9, wherein the outdoor unit further comprises an economizer; the economizer is arranged on a first pipe between the outdoor heat exchanger and the indoor unit, and a return pipe of the economizer is communicated with a medium-pressure suction inlet of the compressor.

13. The air conditioner as claimed in claim 12, wherein a first refrigerant flow path and a second refrigerant flow path are provided in the economizer, and both ends of the first refrigerant flow path are respectively communicated with first pipes at both ends of the economizer; one end of the second refrigerant flow path is communicated with the first pipe through a liquid taking pipe, and the other end of the second refrigerant flow path is communicated with a medium-pressure suction inlet of the compressor through a return pipe; and a liquid taking throttle valve is arranged on the liquid taking pipe.

14. The air conditioner according to claim 13, wherein the inflow end of the liquid take-out pipe communicates with a first pipe between the economizer and the outdoor side heat exchanger, or,

and the inflow end of the liquid taking pipe is communicated with a first pipe between the economizer and the indoor unit.

15. The air conditioner as claimed in claim 12, wherein said return pipe includes a return pipe body, a first conduction pipe and a second conduction pipe;

one end of the first communicating pipe is communicated with the muffler body, and the other end of the first communicating pipe is communicated with a medium-pressure suction inlet of the compressor; a fifth control valve is arranged on the return pipe body or the first return pipe;

one end of the second conduction pipe is communicated with the muffler body, the other end of the second conduction pipe is communicated with the suction pipe, and a sixth control valve is arranged on the second conduction pipe.

Images