CN116202147A - Air conditioner - Google Patents

Abstract

The application provides an air conditioner, including: the outdoor unit comprises a compressor, an outdoor heat exchanger, an outdoor unit liquid pipe and an outdoor unit air pipe, wherein the compressor is connected with the outdoor heat exchanger, the outdoor heat exchanger is connected with the indoor unit liquid pipe of the indoor unit through the outdoor unit liquid pipe, and the outdoor unit air pipe is connected with the indoor unit air pipe of the indoor unit and is connected with the compressor; the regulating device comprises a first valve, a second valve, a branch pipe and a third valve, wherein the first valve is arranged on the outdoor unit liquid pipe to control the on-off of the outdoor unit liquid pipe, the second valve is arranged on the outdoor unit air pipe to control the on-off of the outdoor unit air pipe, the branch pipe is connected with the part of the outdoor unit liquid pipe between the first valve and the outdoor heat exchanger and the part of the outdoor unit air pipe between the second valve and the compressor, and the third valve is arranged on the branch pipe to control the on-off of the branch pipe. Thus, the influence of the defrosting process of the outdoor unit on indoor thermal comfort can be reduced.

Description

Air conditioner

Technical Field

The application relates to the technical field of air conditioners, in particular to an air conditioner.

Background

When the air conditioner heats indoors, the situation that frosting of the outdoor heat exchanger affects heat exchange is unavoidable. The common defrosting method adopts reverse circulation, namely, the air conditioner is switched into a refrigerating mode, so that the high-temperature refrigerant is condensed in the outdoor heat exchanger and the indoor heat exchanger is evaporated, however, the defrosting mode can lead to the indoor incapability of continuously heating, and the indoor thermal comfort is affected.

Disclosure of Invention

One technical problem to be solved by the present application is: the influence of the defrosting process of the outdoor unit on indoor thermal comfort is reduced.

In order to solve the above technical problem, the present application provides an air conditioner, which includes:

the indoor unit comprises an indoor heat exchanger, an indoor unit liquid pipe and an indoor unit air pipe, and the indoor unit liquid pipe and the indoor unit air pipe are connected with the indoor heat exchanger;

the outdoor heat exchanger is connected with the indoor unit liquid pipe through the outdoor unit liquid pipe, and the outdoor unit air pipe is connected with the indoor unit air pipe and is connected with the compressor; and

the at least two regulating devices are in one-to-one correspondence with the at least two outdoor units and respectively comprise a first valve, a second valve, a branch pipe and a third valve, wherein the first valve is arranged on a liquid pipe of the outdoor unit and is used for controlling the on-off of the liquid pipe of the outdoor unit, the second valve is arranged on an air pipe of the outdoor unit and is used for controlling the on-off of the air pipe of the outdoor unit, the branch pipe is connected with the part, between the first valve and the outdoor heat exchanger, of the liquid pipe of the outdoor unit and the part, between the second valve and the compressor, of the air pipe of the outdoor unit, and the third valve is arranged on the branch pipe and is used for controlling the on-off of the branch pipe.

In some embodiments, the controlling device further includes an evaporating part having a first passage and a second passage which can exchange heat with each other, the first passage being connected to a portion of the branch pipe between the third valve and the outdoor unit air pipe, and the second passage being connected to a portion of the outdoor unit air pipe between the second valve and the indoor unit air pipe.

In some embodiments, the second passage is located or not located on a portion of the outdoor unit air pipe between the second valve and the indoor unit air pipe.

In some embodiments, the regulating device further includes a connecting pipe and a fourth valve, the connecting pipe connects the second channel and a portion of the outdoor unit liquid pipe between the first valve and the indoor unit liquid pipe, and the fourth valve is disposed on the connecting pipe to control on-off of the connecting pipe.

In some embodiments, the fourth valve opening is adjustable or non-adjustable.

In some embodiments, the fourth valve is a throttle valve.

In some embodiments, the regulating device further includes a supercooling part having a first flow passage and a second flow passage which can exchange heat with each other, the first flow passage is connected to a portion of the branch pipe between the first passage and the third valve, and the second flow passage is connected to a portion of the outdoor unit liquid pipe between the first valve and the indoor unit liquid pipe.

In some embodiments, the outdoor unit further includes a first throttling element disposed on the outdoor unit liquid pipe, and the first valve is disposed on a portion of the outdoor unit liquid pipe between the first throttling element and the indoor unit liquid pipe.

In some embodiments, the third valve opening is adjustable or non-adjustable; and/or the first valve and/or the second valve can be opened and closed in two directions.

In some embodiments, the third valve is a throttle valve.

In some embodiments, the outdoor unit further includes a bypass pipe connecting the outdoor unit liquid pipe and the inlet of the compressor, and a second throttling element disposed on the bypass pipe.

In some embodiments, the outdoor unit further includes a subcooler having a first flow path and a second flow path that are heat-exchangeable with each other, the first flow path being connected to a portion of the bypass pipe between the second throttling element and the compressor inlet, the second flow path being connected to a portion of the outdoor unit liquid pipe between the outdoor heat exchanger and the first valve.

In the application, a regulating device is arranged for each outdoor unit, and the on-off relation between the outdoor unit and the liquid pipe and the gas pipe of the indoor unit and between the liquid pipe and the gas pipe of the outdoor unit are controlled by utilizing the first valve, the second valve and the third valve of the regulating device, so that part of the outdoor units of the air conditioner can perform self-circulation defrosting without absorbing heat from the indoor, in the defrosting process, the other part of the outdoor units of the air conditioner can perform heating operation, high-temperature refrigerants are provided for the indoor units, continuous heating of the indoor sides is realized, and thus, the continuous heating of the indoor units in the defrosting process can be realized, and the influence of the defrosting process of the outdoor units on indoor thermal comfort is reduced.

Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the present application, which proceeds with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an air conditioner in an embodiment of the present application.

Fig. 2 is an enlarged schematic view of a portion of fig. 1 at a regulating device.

Fig. 3 is a refrigerant flow diagram of the air conditioner shown in fig. 1 in a cooling mode.

Fig. 4 is a refrigerant flow diagram of the air conditioner of fig. 1 in a cooling-supercooling mode.

Fig. 5 is a refrigerant flow diagram of the air conditioner shown in fig. 1 in a heating mode.

Fig. 6 is a refrigerant flow path diagram of the air conditioner of fig. 1 in a defrosting-continuous heating mode.

Fig. 7 is a schematic structural view of a regulating device of the first modification of the embodiment shown in fig. 1.

Fig. 8 is a schematic structural view of an air conditioner in a second modification of the embodiment shown in fig. 1.

Fig. 9 is an enlarged schematic view of a portion of fig. 8 at a regulating device.

Fig. 10 is a schematic structural view of a regulating device of the third modification of the embodiment shown in fig. 1.

Fig. 11 is a schematic structural view of an air conditioner in a fourth modification of the embodiment shown in fig. 1.

Fig. 12 is an enlarged schematic view of a portion of fig. 11 at a regulating device.

Fig. 13 is a schematic structural view of an air conditioner in a fifth modification of the embodiment shown in fig. 1.

Fig. 14 is an enlarged schematic view of a portion of fig. 13 at a regulating device.

Reference numerals illustrate:

100. air-conditioning;

1. an outdoor unit; 11. a compressor; 12. a switching valve; 13. an outdoor heat exchanger; 14. a first throttle member; 15. a second throttle member; 16. a subcooler; 161. a first flow path; 162. a second flow path; 17. an outdoor unit liquid pipe; 171. a first fluid line segment; 172. a second fluid line segment; 18. an outdoor unit air pipe; 181. a first gas pipe section; 182. a second gas pipe section; 19. a gas-liquid separator; 10. a bypass pipe;

2. a regulating device; 21. a first valve; 22. a second valve; 23. a third valve; 24. a fourth valve; 25. an evaporation member; 251. a first channel; 252. a second channel; 253. a first port; 254. a second port; 255. a third port; 256. a fourth port; 26. a supercooling part; 261. a first flow passage; 262. a second flow passage; 263. a first interface; 264. a second interface; 265. a third interface; 266. a fourth interface; 27. a branch pipe; 28. a connecting pipe;

3. An indoor unit; 31. an indoor unit liquid pipe; 32. an indoor unit air pipe; 33. an indoor heat exchanger.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the inventors, are within the scope of the present application, based on the embodiments herein.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

In the description of the present application, it should be understood that, the terms "first," "second," etc. are used for defining the components, and are merely for convenience in distinguishing the corresponding components, and if not otherwise stated, the terms are not to be construed as limiting the scope of the present application.

In addition, the technical features described below in the different embodiments of the present application may be combined with each other as long as they do not collide with each other.

Under heating working conditions, the outdoor heat exchanger is used as an evaporator, and the surface temperature is lower than the ambient temperature, so that frosting phenomenon can occur on the surface of the outdoor heat exchanger after the air conditioner is operated for a period of time, the heat transfer thermal resistance of the outdoor heat exchanger is increased, the heat exchange efficiency is reduced, and the heating effect of the air conditioner is affected.

Therefore, the air conditioner needs to often enter a defrosting mode in the heating process, and then reenters a heating mode after the frost on the outdoor heat exchanger is removed.

In a defrosting mode, the outdoor heat exchanger is switched to the Cheng Lengning evaporator, the indoor heat exchanger is switched to the evaporator by the condenser, refrigerant discharged by the compressor is firstly subjected to heat release and condensation outwards through the outdoor heat exchanger, the surface of the outdoor heat exchanger is heated by the released heat to defrost, and then the refrigerant flows to the indoor heat exchanger after being throttled, and evaporates and absorbs heat.

When the defrosting mode is adopted, the refrigerant is required to be changed into a low-temperature liquid refrigerant at the outdoor heat exchanger, and when the low-temperature liquid refrigerant flows through the indoor unit, the temperature is low, and heat is inevitably extracted from the indoor unit, so that the indoor temperature is reduced, and the indoor thermal comfort is affected. In addition, in order to minimize the influence of the refrigerating effect generated by the evaporation of the indoor heat exchanger on the indoor thermal comfort during defrosting, the indoor fan usually stops running during defrosting, and only exchanges heat in a natural convection mode, so that the heat exchange efficiency is low, the heat exchange is poor, and liquid return is easy to generate.

Therefore, by adopting the defrosting mode, the indoor unit cannot continuously heat, and the indoor thermal comfort is affected.

Aiming at the situation, the structure of the air conditioner is improved, so that the indoor unit can continuously heat in the defrosting process, and the influence of the defrosting process of the outdoor unit on indoor thermal comfort is reduced.

Fig. 1 to 14 exemplarily show the structure of an air conditioner in the present application.

Referring to fig. 1 to 14, in the present application, an air conditioner 100 includes an indoor unit 3, at least two outdoor units 1, and at least two conditioning and control devices 2.

The indoor unit 3 includes an indoor heat exchanger 33, an indoor unit liquid pipe 31, and an indoor unit air pipe 32. The indoor unit liquid pipe 31 and the indoor unit air pipe 32 are connected with an indoor heat exchanger 33.

At least two outdoor units 1 each include a compressor 11, an outdoor heat exchanger 13, an outdoor unit liquid pipe 17, and an outdoor unit gas pipe 18. The compressor 11 is connected to an outdoor heat exchanger 13. The outdoor heat exchanger 13 is connected to the indoor unit liquid pipe 31 through the outdoor unit liquid pipe 17. The outdoor unit air pipe 18 is connected to the indoor unit air pipe 32 and to the compressor 11.

The at least two controlling devices 2 are in one-to-one correspondence with the at least two outdoor units 1, and each include a first valve 21, a second valve 22, a branch pipe 27, and a third valve 23. The first valve 21 is provided in the outdoor unit liquid pipe 17, and controls the on/off of the outdoor unit liquid pipe 17. The second valve 22 is provided on the outdoor air pipe 18, and controls the on/off of the outdoor air pipe 18. The branch pipe 27 connects a portion of the outdoor unit liquid pipe 17 between the first valve 21 and the outdoor heat exchanger 13 and a portion of the outdoor unit gas pipe 18 between the second valve 22 and the compressor 11. The third valve 23 is provided on the branch pipe 27 and controls the on-off of the branch pipe 27.

In the above scheme, the air conditioner 100 is a multi-split air conditioner unit, and each outdoor unit 1 is provided with a regulating device 2, and the on-off relationship between the liquid pipe and the air pipe of the outdoor unit 1 and between the liquid pipe and the air pipe of the indoor unit 3 and between the liquid pipe and the air pipe of the outdoor unit 1 is controlled by using the first valve 21, the second valve 22 and the third valve 23 of the regulating device 2, so that a part of the outdoor units 1 of the air conditioner 100 can perform self-circulation defrosting without absorbing heat from the indoor, and in the defrosting process, the other part of the outdoor units 1 of the air conditioner 100 can perform heating operation to provide high-temperature refrigerants for the indoor units 3, thereby realizing continuous heating of the indoor sides, and reducing the influence of the defrosting process of the outdoor units 1 on indoor thermal comfort.

The outdoor unit 1 performing defrosting is characterized in that the corresponding first valve 21 and the second valve 22 are closed, the third valve 23 is opened, so that the high-temperature refrigerant provided by the compressor 11 of the outdoor unit 1 performing defrosting can sequentially flow through the outdoor heat exchanger 13 and the third valve 23 and then return to the compressor 11 to form self-circulation, the refrigerant does not flow to the indoor unit 3 or other outdoor units 1 in the corresponding self-circulation process, the defrosting can be more fully performed, the corresponding first valve 21 and the corresponding second valve 22 of the outdoor unit 1 performing heating are opened, and the third valve 23 is closed, so that the outdoor unit 1 performing corresponding heating can provide the high-temperature refrigerant for the indoor unit 3 and cooperate with the indoor unit 3 to complete indoor heating circulation.

In the present application, a mode in which a part of the outdoor unit 1 is defrosted and another part of the outdoor unit 1 is engaged with the indoor unit 3 to perform continuous defrosting is called a defrosting-continuous heating mode. Here, a defrosting-continuous heating mode of the air conditioner 100 in the present application will be further described by taking a case of a dual outdoor unit as an example with reference to fig. 6.

When the air conditioner 100 includes two outdoor units 1, one of the outdoor units 1 is referred to as a first outdoor unit and the other outdoor unit 1 is referred to as a second outdoor unit, and two conditioning apparatuses 2 corresponding to the first and second outdoor units, respectively, are referred to as first and second conditioning apparatuses, respectively, for simplicity of description.

Specifically, in fig. 6, the left outdoor unit 1 and the control device 2 are a first outdoor unit and a first control device, and the right outdoor unit 1 and the control device 2 are a second outdoor unit and a second control device.

Fig. 6 shows a case where the first outdoor unit is frosted and the second outdoor unit is heated.

Referring to fig. 6, when the first outdoor unit is defrosted, the switching valve 12 (for example, a four-way valve) of the first outdoor unit is powered down, the first valve 21 and the second valve 22 of the first regulating device are closed, the third valve 23 is opened, the outdoor unit liquid pipe 17 and the outdoor unit air pipe 18 of the first outdoor unit are disconnected, and the outdoor unit liquid pipe 17 and the outdoor unit air pipe 18 of the first outdoor unit are communicated, so that the high-temperature refrigerant discharged by the compressor 11 of the first outdoor unit can enter the outdoor heat exchanger 13 through the switching valve 12 for defrosting, then becomes a medium-pressure low-temperature refrigerant, sequentially flows through the branch pipe 27 where the outdoor unit liquid pipe 17 and the third valve 23 are located and the outdoor unit air pipe 18, and returns to the compressor 11 to complete self-circulation of the defrosting process.

And when the first outdoor unit is frosted, the second outdoor unit is heated and operated. The switching valve 12 of the second outdoor unit is powered on, the first valve 21 and the second valve 22 of the second regulating device are opened, the third valve 23 is closed, the outdoor unit liquid pipe 17 of the second outdoor unit is communicated with the indoor unit liquid pipe 31 of the indoor unit 3, the outdoor unit air pipe 18 of the second outdoor unit is communicated with the indoor unit air pipe 32 of the indoor unit 3, the outdoor unit liquid pipe 17 of the second outdoor unit is disconnected from the outdoor unit air pipe 18, so that the high-temperature refrigerant discharged by the compressor 11 of the second outdoor unit can enter the indoor unit air pipe 32 of the indoor unit 3 through the outdoor unit air pipe 18 of the second outdoor unit to provide continuous heat for indoor heating, and finally, the refrigerant returns to the compressor 11 of the second outdoor unit through the indoor unit liquid pipe 31 of the indoor unit 3 and the outdoor unit liquid pipe 17 of the second outdoor unit to complete heating cycle.

Therefore, the air conditioner 100 provided by the application can realize continuous heating of the indoor unit 3 in the defrosting process, reduce the influence of the defrosting process of the outdoor unit 1 on indoor thermal comfort, and effectively improve indoor thermal comfort.

According to the scheme, continuous heating in the defrosting process is realized by utilizing the advantages that different modules of the multi-split air conditioner can independently operate, and the outdoor heat exchanger 13 of the outdoor unit 1 in defrosting operation and the outdoor heat exchanger 13 of the outdoor unit 1 in heating operation can be naturally insulated by depending on heat insulation between the outdoor units 1, so that special heat insulation design is not needed for the corresponding outdoor heat exchangers 13, and the structure is simpler. Moreover, the outdoor heat exchanger 13 of the outdoor unit 1 running in defrosting and the outdoor heat exchanger 13 of the outdoor unit 1 running in heating can be respectively and completely put into defrosting and heating running, and the heat exchange volume is larger, so that the heat exchange device is favorable for realizing better heat exchange effect and further realizes better defrosting and heating effect. In actual operation, the output of the outdoor unit 1 for heating operation can be increased to meet the higher heating requirement on the indoor side.

In addition, based on the scheme of the application, the high-temperature refrigerant provided by the outdoor unit 1 for heating operation can flow into the indoor space rather than the outdoor unit 1 for defrosting operation, and can flow into the indoor space sufficiently to participate in indoor heating cycle, so that the indoor heating effect is better realized.

The outdoor unit 1 generally includes the first throttling element 14 disposed on the outdoor unit liquid pipe 17, in this case, referring to fig. 1 and 2, the first valve 21 may be disposed at a position on the outdoor unit liquid pipe 17, specifically, may be disposed on a portion of the outdoor unit liquid pipe 17 between the first throttling element 14 and the indoor unit liquid pipe 31, that is, on a side of the first throttling element 14 away from the indoor heat exchanger 13, so that the first valve 21 may control on/off of a portion of the outdoor unit liquid pipe 17 on a side of the first throttling element 14 away from the indoor heat exchanger 13, thereby controlling a flow direction of the refrigerant flowing out of the first throttling element 14.

In the present application, the first valve 21 and the second valve 22 may have only two states of on and off, without adjusting the refrigerant flow rate. In addition, the first valve 21 and/or the second valve 22 may be a switch valve capable of being turned on and off in two directions, so as to control the two-way communication of the outdoor unit liquid pipe 17 and/or the outdoor unit air pipe 18 conveniently, and meet different working requirements of the air conditioner 100 in different modes of refrigeration, heating, defrosting and the like.

In addition, the third valve 23 may be adjustable or non-adjustable in opening. When the opening of the third valve 23 is not adjustable, the third valve 23 only controls the on-off of the branch pipe 27, but does not adjust the flow rate of the refrigerant flowing through the branch pipe 27. When the opening of the third valve 23 is adjustable, the third valve 23 not only can control the on-off of the branch pipe 27, but also can adjust the flow of the refrigerant flowing through the branch pipe 27, which is more beneficial to improving the defrosting efficiency, for example, in some embodiments, the third valve 23 is a throttle valve, and can throttle and reduce the pressure of the refrigerant flowing through the branch pipe 27, so that the refrigerant in the outdoor unit 1 for defrosting can better perform self-circulation, and a more sufficient and efficient defrosting process is realized.

As a further improvement to the previous embodiments, referring to fig. 1-10, the regulating device 2 may comprise not only the first valve 21, the second valve 22, the branch pipe 27 and the third valve 23, but also the evaporation member 25. The evaporation part 25 has a first passage 251 and a second passage 252 which can exchange heat with each other, the first passage 251 being connected to a portion of the branch pipe 27 between the third valve 23 and the outdoor unit air pipe 18, and the second passage 252 being connected to a portion of the outdoor unit air pipe 18 between the second valve 22 and the indoor unit air pipe 32.

The evaporation component 25 can evaporate the refrigerant flowing through the branch pipe 27 of the outdoor unit 1 by using the high-temperature refrigerant provided by the outdoor unit 1 by heating in the defrosting process, so that the defrosting cycle can be completed more smoothly, and the defrosting efficiency is effectively improved.

Wherein the second passage 252 may or may not be located at a portion of the outdoor unit air pipe 18 between the second valve 22 and the indoor unit air pipe 32. When the second passage 252 is located on the portion of the outdoor air pipe 18 located between the second valve 22 and the indoor air pipe 32, the second passage 252 is in the same line as the outdoor air pipe 18, in which case, the evaporation of the refrigerant flowing through the branch pipe 27 of the outdoor unit 1 for defrosting operation can be accomplished by utilizing static heat conduction (natural convection) between the refrigerants. When the second channel 252 is not located on the portion of the outdoor air pipe 18 located between the second valve 22 and the indoor air pipe 32, the second channel 252 and the outdoor air pipe 18 belong to different pipelines, in this case, the flow heat exchange between the refrigerants is convenient to be utilized to complete the evaporation of the refrigerant flowing through the branch pipe 27 of the outdoor unit 1 running in defrosting mode, and the heat exchange efficiency is higher.

In addition, referring to fig. 1 and 2, in case of including the evaporation part 25, the controlling device 2 may further include a connection pipe 28 and a fourth valve 24, the connection pipe 28 connecting a second passage 252 of the evaporation part 25 and a portion of the outdoor unit liquid pipe 17 between the first valve 21 and the indoor unit liquid pipe 31, the fourth valve 24 being disposed on the connection pipe 28 to control on-off of the connection pipe 28. In this way, the second channel 252 of the evaporating part 25 is further connected to the outdoor unit liquid pipe 17 through the connecting pipe 28, and the on-off between the second channel 252 and the outdoor unit liquid pipe 17 is controlled by the fourth valve 24, so that the refrigerant entering the second channel 252 can be converged with the refrigerant from indoor heat exchange through the fourth valve 24 and the outdoor unit liquid pipe 17, and then returned to the compressor 11 of the outdoor unit 1 in heating operation together, and participate in the next cycle, thereby improving the defrosting efficiency and reducing the refrigerant loss of the outdoor unit 1 in heating operation.

Wherein the fourth valve 24 may or may not be adjustable in opening. When the opening of the fourth valve 24 is not adjustable, the fourth valve 24 only controls the on/off of the connection pipe 28, but does not adjust the flow rate of the refrigerant flowing through the connection pipe 28. When the opening degree of the fourth valve 24 is adjustable, the fourth valve 24 not only can control the on/off of the connection pipe 28, but also can adjust the flow rate of the refrigerant flowing through the connection pipe 28, which is more beneficial to improving the defrosting efficiency, for example, in some embodiments, the fourth valve 24 is a throttle valve, which can throttle and reduce the pressure of the refrigerant flowing through the connection pipe 28, so that the part of the refrigerant flowing out from the outdoor unit 1 in heating operation and exchanging heat with the refrigerant flowing back to the outdoor unit 1 in defrosting operation can better circulate.

In addition, referring to fig. 1 and 2, in some embodiments, the regulating device 2 includes not only the evaporation part 25 but also the supercooling part 26, the supercooling part 26 having a first flow passage 261 and a second flow passage 262 which can exchange heat with each other, the first flow passage 261 being connected to a portion of the branch pipe 27 between the first passage 251 and the third valve 23, the second flow passage 262 being connected to a portion of the outdoor unit liquid pipe 17 between the first valve 21 and the indoor unit liquid pipe 31.

The supercooling member 26 can further cool the refrigerant flowing through the outdoor unit liquid pipe 17 to the indoor unit liquid pipe 31 by using the refrigerant flowing through the branch pipe 27, thereby realizing a supercooling effect and meeting the further supercooling requirement of the air conditioner 100.

As a further improvement of the outdoor unit 1 in the foregoing embodiments, referring to fig. 1 and 2, the outdoor unit 1 may further include a bypass pipe 10 and a second throttling element 15, wherein the bypass pipe 10 connects the outdoor unit liquid pipe 17 with the inlet of the compressor 11, and the second throttling element 15 is disposed on the bypass pipe 10. In this way, the refrigerant flowing out of the outdoor heat exchanger 13 can flow back to the compressor 11 after being throttled by the second throttling element 15, so that the internal circulation of the outdoor unit 1 is realized, defrosting can be performed in the corresponding internal circulation process, and the defrosting does not need to absorb heat from the indoor side, so that the defrosting efficiency is further improved, and the influence of the defrosting process on the indoor temperature is reduced.

Also, referring to fig. 1, in some embodiments, the outdoor unit 1 includes not only the bypass pipe 10 and the second throttling element 15, but also the subcooler 16, the subcooler 16 having a first flow path 161 and a second flow path 162 which can exchange heat with each other, the first flow path 161 being connected to a portion of the bypass pipe 10 between the second throttling element 15 and the inlet of the compressor 11, and the second flow path 162 being connected to a portion of the outdoor unit liquid pipe 17 between the outdoor heat exchanger 13 and the first valve 21.

The subcooler 16 can utilize the refrigerant flowing through the outdoor unit liquid pipe 17 to cool the refrigerant throttled by the second throttling element 15, so that the internal circulation of the outdoor unit 1 can be smoothly completed. In addition, in the case that the outdoor unit 1 includes the subcooler 16 and the adjusting and controlling device 2 includes the subcooling part 26, the subcooler 16 and the subcooling part 26 can achieve a two-stage subcooling effect, and thus the two-stage subcooling requirement of the air conditioner 100 can be effectively satisfied.

The present application will be further described with reference to the embodiments shown in fig. 1-14.

The embodiment shown in fig. 1-6 will be described first.

As shown in fig. 1 to 6, in this embodiment, the air conditioner 100 includes an indoor unit 3, two outdoor units 1, and two conditioning devices 2.

The indoor unit 3 includes an indoor unit liquid pipe 31, an indoor unit gas pipe 32, and an indoor heat exchanger 33. The indoor unit liquid pipe 31 and the indoor unit air pipe 32 are connected with an indoor heat exchanger 33.

The two outdoor units 1 have the same structure and each includes a compressor 11, a switching valve 12, an outdoor heat exchanger 13, a first throttle member 14, a bypass pipe 10, a second throttle member 15, a subcooler 16, an outdoor unit liquid pipe 17, an outdoor unit gas pipe 18, and a gas-liquid separator 19.

The compressor 11 is connected to an outdoor heat exchanger 13 through a switching valve 12. The outdoor heat exchanger 13 is connected to the indoor unit liquid pipe 31 through the outdoor unit liquid pipe 17. The outdoor unit air pipe 18 is connected to the indoor unit air pipe 32, and is connected to the compressor 11 through the switching valve 12. The switching valve 12 is specifically a four-way valve, which is powered off and powered on, and communicates the outlet of the compressor 11 with the outdoor heat exchanger 13 and the outdoor unit air pipe 18, respectively. A gas-liquid separator 19 is provided between the switching valve 12 and the inlet of the compressor 11 for performing gas-liquid separation.

The outdoor unit liquid pipe 17 is provided with a first throttle 14. As shown in fig. 1, in this embodiment, the first throttling element 14 is an expansion valve, specifically, an electronic expansion valve, which is provided on the outdoor unit liquid pipe 17 for throttling and depressurization.

The bypass pipe 10 connects the outdoor unit liquid pipe 17 and the gas-liquid separator 19, specifically, as shown in fig. 1, in this embodiment, the bypass pipe 10 connects the gas-liquid separator 19 and a portion of the outdoor unit liquid pipe 17 located between the first throttle member 14 and the indoor unit liquid pipe 31, and at this time, the first throttle member 14 is located between a connection point of the bypass pipe 10 and the outdoor unit liquid pipe 17 and the outdoor heat exchanger 13, in other words, a connection point of the bypass pipe 10 and the outdoor unit liquid pipe 17 is located on a side of the first throttle member 14 remote from the outdoor heat exchanger 13. A second throttling element 15 is provided on the bypass pipe 10 for throttling the pressure reduction, in particular in this embodiment the second throttling element 15 comprises an expansion valve, for example an electronic expansion valve. Thus, the refrigerant flowing through the first throttling element 14 can be divided into two paths, one path still flows downstream along the outdoor unit liquid pipe 17, the other path flows into the bypass pipe 10, and after being throttled and depressurized by the second throttling element 15, the refrigerant flows back to the compressor 11 through the gas-liquid separator 19, so that the internal circulation of the outdoor unit 1 flowing through the bypass pipe 10 is realized.

The subcooler 16 is disposed on the outdoor unit liquid pipe 17 and the bypass pipe 10, and is configured to cool down the portion of the refrigerant flowing through the bypass pipe 10 by utilizing the portion of the refrigerant flowing along the outdoor unit liquid pipe 17, so that the internal circulation of the outdoor unit 1 flowing through the bypass pipe 10 is more smoothly completed. As shown in fig. 1, in this embodiment, the subcooler 16 has a first flow path 161 and a second flow path 162 that are mutually heat-exchangeable, the first flow path 161 being located on a portion of the bypass pipe 10 located between the second throttling 15 and the gas-liquid separator 19, and the second flow path 162 being located on a portion of the outdoor unit liquid pipe 17 located away from the outdoor heat exchanger 13 of the first throttling 14. At this time, the connection point between the bypass pipe 10 and the outdoor unit liquid pipe 17 is located between the subcooler 16 and the first throttling element 14, the subcooler 16 is located between the second throttling element 15 and the gas-liquid separator 19, the subcooler 16 can utilize the part of the refrigerant flowing along the outdoor unit liquid pipe 17 to subcool the refrigerant throttled by the second throttling element 15, so that the refrigerant flowing out of the second throttling element 15 can be cooled further, and then returned to the compressor 11 through the gas-liquid separator 19, thereby smoothly completing the internal circulation process of the outdoor unit 1 through the bypass pipe 10.

The two regulating devices 2 are in one-to-one correspondence with the two outdoor units 1, and the two regulating devices 2 have the same structure, and each of the two regulating devices comprises a first valve 21, a second valve 22, a branch pipe 27, a third valve 23, a connecting pipe 28, a fourth valve 24, an evaporation part 25 and a supercooling part 26.

The first valve 21 is disposed on the outdoor unit liquid pipe 17, and is used for controlling on-off of the outdoor unit liquid pipe 17. As shown in fig. 1 and 2, in this embodiment, the first valve 21 is provided on a portion of the outdoor unit liquid pipe 17 between the first throttle 14 and the indoor unit liquid pipe 31, specifically, the first valve 21 is provided on a portion of the outdoor unit liquid pipe 17 between the subcooler 16 and the indoor unit liquid pipe 31. Thus, the first valve 21 divides the outdoor unit liquid pipe 17 into two parts, namely, a first liquid pipe section 171 located between the first valve 21 and the outdoor heat exchanger 13, and a second liquid pipe section 172 located between the first valve 21 and the indoor unit liquid pipe 31. In this embodiment, the first valve 21 is a two-way on-off valve, which can control the two-way on-off between the first liquid pipe section 171 and the second liquid pipe section 172, and further control the two-way on-off between the outdoor unit liquid pipe 17 and the indoor unit liquid pipe 31.

The second valve 22 is disposed on the outdoor air pipe 18, and is used for controlling the on-off of the outdoor air pipe 18. As shown in fig. 1 and 2, in this embodiment, the second valve 22 is provided on a portion of the outdoor unit air pipe 18 between the switching valve 12 and the indoor unit air pipe 32. Thus, the second valve 22 divides the outdoor unit air pipe 18 into two parts, namely, a first air pipe section 181 between the switching valve 12 and the second valve 22, and a second air pipe section 182 between the second valve 22 and the indoor unit air pipe 32. Also, in this embodiment, the second valve 22 is a two-way on-off valve capable of controlling two-way on-off between the first air pipe section 181 and the second air pipe section 182, and thus controlling two-way on-off between the outdoor unit air pipe 18 and the indoor unit air pipe 32.

The branch pipe 27 connects the first liquid pipe section 171 (i.e., the portion of the outdoor unit liquid pipe 17 between the first valve 21 and the outdoor heat exchanger 13) and the first gas pipe section 181 (i.e., the portion of the outdoor unit gas pipe 18 between the second valve 22 and the switching valve 12), and the third valve 23 is provided on the branch pipe 27. As shown in fig. 2, in this embodiment, the third valve 23 is a throttle valve, specifically, an expansion valve, which is provided on the branch pipe 27, and controls not only the on-off of the branch pipe 27, but also the flow rate of the refrigerant flowing through the branch pipe 27, and throttles and depressurizes the refrigerant flowing through the branch pipe 27.

The evaporation unit 25 is provided in the branch pipe 27, and evaporates the refrigerant throttled and depressurized by the third valve 23. As shown in fig. 1 and 2, in this embodiment, the evaporation member 25 includes a first channel 251 and a second channel 252 that can exchange heat with each other. The first passage 251 is located on the branch pipe 27, and in particular on a portion of the branch pipe 27 between the third valve 23 and the first gas pipe section 181, communicating the third valve 23 with the first gas pipe section 181. The second passage 252 is not located on the outdoor unit air pipe 18, but connects the second air pipe segment 182 with the second liquid pipe segment 172. Specifically, as shown in fig. 2, the two ports of the first channel 251 are a first port 253 and a second port 254, respectively, wherein the first port 253 communicates with the third valve 23, and the second port 254 communicates with the first gas pipe section 181, such that the first channel 251 communicates the third valve 23 with the first gas pipe section 181. And two ports of the second channel 252 are a third port 255 and a fourth port 256, respectively, wherein the third port 255 is connected with the second air pipe segment 182, and the fourth port 256 is connected with the second liquid pipe segment 172 through the connecting pipe 28, so that the second channel 252 connects the second air pipe segment 182 with the second liquid pipe segment 172, and the connection between the second channel 252 of the evaporating component 25 and the second air pipe segment 182 and the second liquid pipe segment 172 is realized.

The fourth valve 24 is provided on the connection pipe 28. As shown in fig. 2, in this embodiment, the fourth valve 24 is a throttle valve, specifically, an expansion valve, which is disposed on the connection pipe 28, and controls not only the on-off of the connection pipe 28, but also the flow rate of the refrigerant flowing through the connection pipe 28, so as to throttle and depressurize the refrigerant flowing through the connection pipe 28.

The supercooling member 26 is disposed on the outdoor unit liquid pipe 17 and the branch pipe 27, and is configured to cool the refrigerant flowing through the outdoor unit liquid pipe 17 and the indoor unit liquid pipe 31 by using the refrigerant flowing through the branch pipe 27, thereby achieving the supercooling purpose. As shown in fig. 2, in this embodiment, the supercooling member 26 is located on the second liquid pipe section 172 at a position on the outdoor unit liquid pipe 17, and the supercooling member 26 is located between the evaporating member 25 and the third valve 23 at a position on the branch pipe 27. Specifically, as can be seen from fig. 2, in this embodiment, the supercooling member 26 includes a first flow passage 261 and a second flow passage 262 that can mutually exchange heat. The first flow passage 261 is located on the branch pipe 27 between the first passage 251 and the third valve 23 of the vaporizing element 25, and its two ports, i.e., the first port 263 and the second port 264, are respectively communicated with the first port 253 and the third valve 23 of the first passage 251. The second flow passage 262 is located on the outdoor unit liquid pipe 17 and on the second liquid pipe section 172, and two ports thereof, namely, the third port 265 and the fourth port 266, are respectively communicated with the first valve 21 and the indoor unit liquid pipe 31. In this embodiment, as shown in fig. 2, the second flow passage 262 is located at the outdoor unit liquid pipe 17 at a position on the side of the connection point between the connection pipe 28 and the outdoor unit liquid pipe 17 near the first valve 21, and at this time, the connection pipe 28 is connected to a portion of the outdoor unit liquid pipe 17 between the supercooling member 26 and the indoor unit liquid pipe 31.

Based on the above-described structural arrangement, the air conditioner 100 of this embodiment can realize a cooling mode, a cooling-re-supercooling mode, a heating mode, and a defrosting-continuous heating mode. These four modes are described in turn below in connection with fig. 3-6.

Fig. 3 shows the refrigerant flow path of the air conditioner 100 of this embodiment in the cooling mode. As shown in fig. 3, in the cooling mode, the switching valve 12 of each outdoor unit 1 is in a power-off state, the first valve 21 and the second valve 22 of each regulating device 2 are in an open state, and the third valve 23 and the fourth valve 24 are in a closed state, so that when the two outdoor units 1 work, the high-temperature refrigerant discharged from the compressor 11 enters the outdoor heat exchanger 13 through the switching valve 12 to be condensed, passes through the cooler 16 and enters the regulating device 2, flows into the indoor unit liquid pipe 31 after passing through the second flow passage 262 of the supercooling part 26 of the regulating device 2, enters into the indoor side for heat exchange, and the refrigerant after the indoor side for heat exchange returns to the gas-liquid separator 19 after passing through the second gas pipe 182, the first gas pipe 181 and the switching valve 12 in sequence, finally returns to the compressor 11, and thus circulates, and the indoor cooling process is completed.

Fig. 4 shows the refrigerant flow path of the air conditioner 100 of this embodiment in the cooling-re-supercooling mode. As shown in fig. 4, the difference between the refrigeration-re-supercooling mode and the refrigeration mode is that the third valve 23 is not closed but is opened, that is, in the refrigeration-re-supercooling mode, the switching valve 12 of each outdoor unit 1 is in a power-down state, the first valve 21, the second valve 22 and the third valve 23 of each control device 2 are in an open state, and the fourth valve 24 is in a closed state, so that when the two outdoor units 1 are operated, the refrigerant entering the control device 2 through the first liquid pipe section 171 from the outdoor heat exchanger 13 is split into two paths, one path enters the first flow passage 261 of the supercooling part 26 through the third valve 23, exchanges heat with the refrigerant entering the control device 2 through the second flow passage 262 of the cooling part 26, flows into the first gas pipe section 181 through the first flow passage 251 of the evaporating part 25 after heat exchange, returns to the compressor 11 through the gas-liquid separator 19, and the other path enters the indoor liquid pipe section 31 after being cooled again through the second flow passage 262 of the supercooling part 26.

Fig. 5 shows the refrigerant flow path of the air conditioner 100 of this embodiment in the heating mode. As shown in fig. 5, the heating mode is different from the cooling mode in that the switching valve 12 is not powered off, that is, in the heating mode, the switching valve 12 of each outdoor unit 1 is powered on, the first valve 21 and the second valve 22 of each control device 2 are opened, and the third valve 23 and the fourth valve 24 are closed, so that when the two outdoor units 1 are operated, the refrigerant discharged from the compressor 11 enters the indoor side through the switching valve 12, the first air pipe section 181, the second valve 22 and the second air pipe section 182 to exchange heat and condense, and the condensed refrigerant enters the outdoor heat exchanger 13 through the second liquid pipe section 172, the second flow passage 262 of the supercooling part 26, the first valve 21 and the first liquid pipe section 171 to evaporate, and then returns to the air-liquid separator 19 through the switching valve 12 to finally return to the compressor 11, thus circulating.

Fig. 6 shows the refrigerant flow path of the air conditioner 100 of this embodiment in the defrosting-continuous heating mode. As shown in fig. 6, in the defrosting-continuous heating mode, one outdoor unit 1 is defrosting and the other outdoor unit 1 is heating. Here, the defrosting of the first outdoor unit on the left side and the heating of the second outdoor unit on the right side are taken as examples.

The switching valve 12 of the first outdoor unit is powered down, the first valve 21 and the second valve 22 of the corresponding first regulating device are closed, and the third valve 23 and the fourth valve 24 are opened, so that the high-temperature refrigerant discharged from the compressor 11 of the first outdoor unit enters the outdoor heat exchanger 13 for defrosting through the switching valve 12, becomes a medium-pressure low-temperature refrigerant, enters the first regulating device through the first liquid pipe section 171, and enters the first channel 251 of the evaporating part 25 through the third valve 23, the first flow channel 261 of the supercooling part 26 and the first port 253 of the evaporating part 25.

The switching valve 12 of the second outdoor unit is powered on, and the first valve 21 and the second valve 22 of the corresponding second control device are opened, and the third valve 23 and the fourth valve 24 are closed, so that the high-temperature refrigerant discharged from the compressor 11 of the second outdoor unit enters the second control device through the first air pipe section 181 and flows into the second air pipe section 182 through the second valve 22 of the second control device, and then is divided into two paths at the junction of the second air pipe section 182 of the second outdoor unit, the second air pipe section 182 of the first outdoor unit and the air pipe 32 of the indoor unit, one path flows into the air pipe 32 of the indoor unit, enters the indoor unit for heat exchange, provides continuous heat for the indoor unit, the other path flows into the second air pipe section 182 of the first outdoor unit, and enters the second channel 252 of the evaporation part 25 of the first control device through the third port 255 of the evaporation part 25 of the first control device, the refrigerant flowing through the first channel 251 of the evaporating part 25 of the first regulating device from the first outdoor unit evaporates and condenses itself, so that the refrigerant flowing through the first channel 251 of the evaporating part 25 from the first outdoor unit evaporates and then is discharged through the second port 254 of the evaporating part 25 of the first regulating device, enters the first gas pipe section 181 of the first outdoor unit, returns to the gas-liquid separator 19 of the first outdoor unit, finally returns to the compressor 11 of the first outdoor unit, and the refrigerant flowing through the second channel 252 of the evaporating part 25 of the first regulating device from the second outdoor unit is discharged through the fourth port 256 of the evaporating part 25 of the first regulating device after condensing, enters the second liquid pipe section 172 of the first outdoor unit after passing through the fourth valve 24, merges with the refrigerant flowing through the second liquid pipe section 172 of the second regulating device after merging, the refrigerant flowing through the second liquid pipe section 172 of the second regulating device, the first valve 21 and the first liquid pipe section 171 enter the outdoor heat exchanger 13 of the second outdoor unit to evaporate, and after evaporation, the vapor is returned to the gas-liquid separator 19 by the switching valve 12 of the second outdoor unit, and finally returned to the compressor 11.

In the four modes of operation described above, the valve states of the air conditioner 100 are shown in the following table.

It can be seen that, in the air conditioner 100 of this embodiment, by controlling the switching states of the switching valve 12, the first valve 21, the second valve 22, the third valve 23 and the fourth valve 24, the operation can be switched among the heating mode, the cooling-supercooling mode, the heating mode and the defrosting-continuous heating mode, so that not only the normal cooling, heating and cooling-supercooling requirements can be satisfied, but also the indoor continuous heating requirement during defrosting can be satisfied, the operation flexibility is higher, the operation performance is better, and the more efficient cooling, heating and defrosting processes can be realized.

Note that, in order to achieve continuous heating in the room during defrosting, the air conditioner 100 is not limited to the configuration shown in fig. 1 to 6. Fig. 7-14 show, by way of example, a variant of the embodiment shown in fig. 1-6.

Several variations shown in fig. 7-14 are described next. Also, in order to simplify the description, only differences between the modifications and from the embodiments shown in fig. 1 to 6 will be described with emphasis, and where not described, the description of other modifications and the description of the embodiments shown in fig. 1 to 6 may be understood with reference to the foregoing.

First, a first modification shown in fig. 7 is described.

As shown in fig. 7, this first modification differs from the embodiment shown in fig. 1 to 6 mainly in the structure of the regulating device 2. Specifically, in this second modification, the regulating device 2 no longer includes the supercooling member 26, the first passage 251 of the evaporating member 25 is no longer connected to the third valve 23 through the first flow passage 261 of the supercooling member 26, but is directly connected to the third valve 23, and the first valve 21 is no longer connected to the indoor unit liquid pipe 31 through the second flow passage 262 of the supercooling member 26, but is directly connected to the indoor unit liquid pipe 31.

The air conditioner 100 of this embodiment can still flexibly switch operation in the heating mode, the cooling-supercooling mode, the heating mode and the defrosting-continuous heating mode by controlling the on-off states of the switching valve 12, the first valve 21, the second valve 22, the third valve 23 and the fourth valve 24, only that it does not provide secondary supercooling for the outdoor unit by the supercooling part 26 any more, and can meet the operation requirement of the air conditioner 100 without further supercooling.

It can be seen that the supercooling means 26 may be selectively provided according to the need. For the air conditioner 100 requiring further supercooling, a supercooling part 26 may be provided to provide supercooling for the outdoor unit 1; while the supercooling part 26 may not be provided for the air conditioner 100 requiring no further supercooling.

Next, a second modification shown in fig. 8 to 9 will be described.

As shown in fig. 8 and 9, this second modification differs from the embodiment shown in fig. 1 to 6 mainly in the structure of the regulating device 2. Specifically, in the second modification, the regulating device 2 still includes the evaporating part 25 and the supercooling part 26, but the second passage 252 of the evaporating part 25 is not located on a different line from the outdoor air pipe 18 of the outdoor unit 1, but is located on the same line, that is, the second passage 252 of the evaporating part 25 is located on the outdoor air pipe 18 and is located on the same line as the outdoor air pipe 18. At this time, the third port 255 and the fourth port 256 of the second channel 252 of the evaporating part 25 are located on the outdoor air pipe 18, and the fourth port 256 is no longer connected to the second liquid pipe segment 172 through the connection pipe 28.

Based on the above arrangement, when the outdoor unit 1 connected to the control device 2 is in defrosting operation, the high-temperature refrigerant introduced through the second air pipe segment 182 no longer exchanges heat with the refrigerant flowing through the first channel 251, but evaporates the refrigerant flowing through the first channel 251 by utilizing natural heat conduction between the refrigerants.

Specifically, in the embodiment shown in fig. 1 to 6, the high-temperature refrigerant from the second outdoor unit running from the heating operation further flows through the second channel 252 of the evaporating part 25 of the first regulating device after entering the second air pipe section 182 of the first outdoor unit, and flows into the second liquid pipe section 172 of the first outdoor unit, and in the corresponding process, the high-temperature refrigerant flows and exchanges heat with the refrigerant flowing through the first channel 251 at the evaporating part 25, and the heat exchange efficiency is relatively high because the refrigerant flows. In the second modification shown in fig. 8 to 9, since the second valve 22 of the first control device is closed, the high-temperature refrigerant from the second outdoor unit, which is operated by heating, does not flow again after entering the second air pipe section 182 of the first outdoor unit, and is in a non-flowing state, and therefore, only static heat conduction between the refrigerants can be used for heat exchange at the evaporation member 25 of the first control device, and the heat exchange efficiency is relatively low, but the requirement of defrosting cycle can be satisfied.

Next, a third modification shown in fig. 10 is described.

As shown in fig. 10, this third modification is the same as the second modification shown in fig. 8 to 9 in that the second passage 252 of the evaporating part 25 is also the same line as the outdoor-unit air pipe 18, but unlike the second modification shown in fig. 8 to 9, the regulating device 2 no longer includes the supercooling part 26, which is a structure for satisfying the air conditioner 100 that does not require further supercooling.

Next, a fourth modification shown in fig. 11 to 12 is described.

As shown in fig. 11 to 12, in this fourth modification, the regulating device 2 no longer includes the evaporation part 25 and the supercooling part 26.

In this way, when the outdoor unit is defrosted, the high-temperature and high-pressure refrigerant discharged by the compressor 11 enters the outdoor heat exchanger 13 to be condensed and defrosted, the condensed refrigerant enters the regulating and controlling device 2, is throttled and depressurized again by the third valve 23, enters the gas-liquid separator 19 by the first gas pipe section 181, and finally returns to the compressor 11.

In this modification, the high-temperature refrigerant flowing out of the outdoor unit 1 that is being heated flows into the second air pipe section 182 of the outdoor unit 1 that is being defrosted, but since the second valve 22 of the regulating device corresponding to the outdoor unit 1 that is being defrosted is in the closed state, the high-temperature refrigerant that enters the second air pipe section 182 of the outdoor unit 1 that is being defrosted cannot enter the first air pipe section 181 of the outdoor unit 1 that is being defrosted through the second valve 22, and therefore, in this modification, the high-temperature refrigerant of the outdoor unit 1 that is being heated is not utilized to exchange heat with the refrigerant flowing through the branch pipe 27 during defrosting, but the defrosting cycle is directly realized by utilizing the heat of the work done by the compressor 11.

It can be seen that not only the supercooling part 26 but also the evaporating part 25 may be selectively provided according to the need. When the evaporation part 25 is provided, the outdoor unit 1 can be quickly defrosted by utilizing the flowing heat source refrigerant. When the evaporation part 25 is not provided, the structure is simpler, but the defrosting efficiency is slightly lower.

Finally, a fifth variant shown in fig. 13-14 is described.

As shown in fig. 13 to 14, this fifth modification no longer includes the evaporation member 25 and the supercooling member 26 as in the fourth modification shown in fig. 11 to 12, but differs from the fourth modification shown in fig. 11 to 12 in that in this fifth modification, the third valve 23 is not a throttle valve but becomes a valve having no throttle function.

In this way, when the outdoor unit 1 is defrosted, the high-temperature and high-pressure refrigerant discharged from the compressor 11 enters the outdoor heat exchanger 13 to be condensed and defrosted, then enters the regulating and controlling device 2 after the throttle and depressurization is completed at the first throttle element 14, returns to the first air pipe section 181 through the third valve 23, finally flows through the air-inlet liquid separator 19 and returns to the compressor 11. In the corresponding defrosting process, the third valve 23 is in a communication state, so that the low-temperature refrigerant condensed by the outdoor heat exchanger 13 of the outdoor unit 1 for defrosting operation is conveniently returned to the outdoor side, and defrosting circulation is formed.

In the embodiments of the present application, the control device 2 may be disposed outside the outdoor unit 1, or may be disposed inside the outdoor unit 1, so that the installation is flexible.

The foregoing description of the exemplary embodiments of the present application is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, alternatives, and alternatives falling within the spirit and scope of the invention.

Claims (12)

1. An air conditioner (100), characterized by comprising:

the indoor unit (3) comprises an indoor heat exchanger (33), an indoor unit liquid pipe (31) and an indoor unit air pipe (32), wherein the indoor unit liquid pipe (31) and the indoor unit air pipe (32) are connected with the indoor heat exchanger (33);

the outdoor unit (1) comprises a compressor (11), an outdoor heat exchanger (13), an outdoor unit liquid pipe (17) and an outdoor unit air pipe (18), wherein the compressor (11) is connected with the outdoor heat exchanger (13), the outdoor heat exchanger (13) is connected with the indoor unit liquid pipe (31) through the outdoor unit liquid pipe (17), and the outdoor unit air pipe (18) is connected with the indoor unit air pipe (32) and is connected with the compressor (11); and

at least two regulation and control device (2), at least two regulation and control device (2) with at least two off-premises station (1) one-to-one to all include first valve (21), second valve (22), branch pipe (27) and third valve (23), first valve (21) set up in on off of off-premises station liquid pipe (17), control second valve (22) set up in on-premises station trachea (18), control off of off-premises station trachea (18), branch pipe (27) connect part that is located between first valve (21) and off-premises station heat exchanger (13) of off-premises station liquid pipe (17) with part that is located between second valve (22) and compressor (11) of off-premises station trachea (18), third valve (23) set up in on-premises station branch pipe (27), and control off-on-off of branch pipe (27).

2. An air conditioner (100) according to claim 1, wherein the regulating device (2) further comprises an evaporation member (25), the evaporation member (25) having a first passage (251) and a second passage (252) which are heat-exchangeable with each other, the first passage (251) being connected to a portion of the branch pipe (27) between the third valve (23) and the outdoor unit air pipe (18), the second passage (252) being connected to a portion of the outdoor unit air pipe (18) between the second valve (22) and the indoor unit air pipe (32).

3. The air conditioner (100) according to claim 2, wherein the second passage (252) is located on a portion of the outdoor unit air pipe (18) located between the second valve (22) and the indoor unit air pipe (32) or not.

4. The air conditioner (100) according to claim 2, wherein the control device (2) further comprises a connecting pipe (28) and a fourth valve (24), the connecting pipe (28) connects the second channel (252) and a portion of the outdoor unit liquid pipe (17) located between the first valve (21) and the indoor unit liquid pipe (31), and the fourth valve (24) is disposed on the connecting pipe (28) and controls on-off of the connecting pipe (28).

5. The air conditioner (100) according to claim 4, wherein the fourth valve (24) opening is adjustable or non-adjustable.

6. The air conditioner (100) according to claim 5, wherein the fourth valve (24) is a throttle valve.

7. An air conditioner (100) according to any one of claims 2 to 6, wherein the regulating device (2) further comprises a supercooling part (26), the supercooling part (26) has a first flow passage (261) and a second flow passage (262) which can exchange heat with each other, the first flow passage (261) is connected to a portion of the branch pipe (27) located between the first passage (251) and the third valve (23), and the second flow passage (262) is connected to a portion of the outdoor unit liquid pipe (17) located between the first valve (21) and the indoor unit liquid pipe (31).

8. An air conditioner (100) according to any one of claims 1 to 6, wherein the outdoor unit (1) further includes a first throttling element (14), the first throttling element (14) is disposed on the outdoor unit liquid pipe (17), and the first valve (21) is disposed on a portion of the outdoor unit liquid pipe (17) between the first throttling element (14) and the indoor unit liquid pipe (31).

9. The air conditioner (100) according to any one of claims 1 to 6, wherein the opening degree of the third valve (23) is adjustable or non-adjustable; and/or the first valve (21) and/or the second valve (22) can be opened and closed in two directions.

10. The air conditioner (100) according to claim 9, wherein the third valve (23) is a throttle valve.

11. An air conditioner (100) according to any one of claims 1 to 6, wherein the outdoor unit (1) further comprises a bypass pipe (10) and a second throttling element (15), the bypass pipe (10) connecting the outdoor unit liquid pipe (17) with the inlet of the compressor (11), the second throttling element (15) being provided on the bypass pipe (10).

12. The air conditioner (100) according to claim 11, wherein the outdoor unit (1) further includes a subcooler (16), the subcooler (16) having a first flow path (161) and a second flow path (162) that are heat-exchangeable with each other, the first flow path (161) being connected to a portion of the bypass pipe (10) between the second throttling element (15) and the inlet of the compressor (11), the second flow path (162) being connected to a portion of the outdoor unit liquid pipe (17) between the outdoor heat exchanger (13) and the first valve (21).

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