CN211177140U

CN211177140U - Air conditioner

Info

Publication number: CN211177140U
Application number: CN201921515638.3U
Authority: CN
Inventors: 雷俊杰; 陶骙; 黎顺全; 王正兴; 朱天贵; 黄志刚
Original assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-08-04
Anticipated expiration: 2029-09-11

Abstract

The utility model discloses an air conditioner, which comprises an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compression mechanism and an outdoor heat exchanger, and the indoor unit comprises a first heat exchanger and a dehumidification throttling regulation device; the air conditioner further includes: a discharge pipe, a low-pressure suction pipe, a liquid-side piping, and a gas-side piping; the indoor unit also comprises a second heat exchanger, a reheating throttling regulation device and a heat circulation device for sending the heat or cold of the indoor unit into the room; the air conditioner also comprises a branch pipe and high and low pressure piping; the air conditioner also comprises a communicating pipe; the indoor unit further includes: a housing; the first heat exchanger is arranged in the first air duct, and the second heat exchanger is arranged in the second air duct; the air outlet device is arranged on the air outlet side and is provided with a first air inlet, a second air inlet and an air outlet, the first air inlet is communicated with the first air channel, and the second air inlet is communicated with the second air channel. The utility model discloses technical scheme is favorable to improving air conditioning system's adaptability.

Description

Air conditioner

Technical Field

The utility model relates to an air conditioner technical field, in particular to air conditioner.

Background

Along with the improvement of living standard of people, people have higher and higher requirements on air conditioners. Due to the complexity of weather, people sometimes need cooling by cold, sometimes need heating by heat, and sometimes need dehumidification under the condition of not changing the temperature greatly. However, the conventional air conditioner has a single function and is difficult to meet the requirements of people.

SUMMERY OF THE UTILITY MODEL

The main object of the utility model is to provide an air conditioner aims at improving the adaptability of air conditioner in order to satisfy user's demand.

In order to achieve the purpose, the utility model provides an air conditioner, including outdoor unit and indoor unit, outdoor unit includes compression mechanism and outdoor heat exchanger, indoor unit includes first heat exchanger and dehumidification throttle adjusting device;

the air conditioner further includes: a discharge pipe connected to a discharge side of the compression mechanism, a low-pressure suction pipe connected to a low-pressure suction side of the compression mechanism, a liquid-side pipe connecting the discharge pipe, the outdoor heat exchanger, the dehumidification throttle control device, and the first heat exchanger in this order, and a gas-side pipe connecting the first heat exchanger and the low-pressure suction pipe, thereby forming a dehumidification circuit;

the indoor unit also comprises a second heat exchanger, a reheating throttling regulation device and a heat circulation device for sending the heat or cold of the indoor unit into the room;

the air conditioner further includes a high-low pressure pipe that forms a reheat circuit by connecting a first intersection of the liquid side pipe, the reheat throttle control device, the second heat exchanger, and the branch pipe in this order, and a branch pipe that branches from the discharge pipe, wherein the first intersection is located between the dehumidification throttle control device and the outdoor heat exchanger;

the air conditioner also comprises a communicating pipe, wherein one end of the communicating pipe is communicated with the high-low pressure distribution pipe, and the other end of the communicating pipe is communicated with a gas side distribution pipe or a low-pressure suction pipe;

a first control valve is arranged on the branch pipe, and a second control valve is arranged on the communicating pipe;

the indoor unit further includes:

the air conditioner comprises a shell, a fan and a control device, wherein the shell is provided with an air inlet side, an air outlet side, a first air channel and a second air channel, and the first air channel and the second air channel are communicated with the air inlet side and the air outlet side and are mutually independent;

the first heat exchanger is arranged in the first air duct, and the second heat exchanger is arranged in the second air duct;

the air outlet device is arranged on the air outlet side and provided with a first air inlet, a second air inlet and an air outlet, the first air inlet is communicated with the first air channel, and the second air inlet is communicated with the second air channel.

Optionally, the outdoor unit further comprises a first switch switchable between a first switch first switching state and a first switch second switching state,

in the first switching state, the first switch communicates the liquid-side pipe with the suction pipe and communicates the gas-side pipe with the discharge pipe,

in the second switching state, the first switch communicates the liquid-side pipe with the discharge pipe and communicates the gas-side pipe with the suction pipe.

Optionally, the air conditioner further comprises:

the first air door assembly is arranged corresponding to the first air inlet so as to adjust the air inlet area of the first air inlet; and/or the presence of a gas in the gas,

the second air door assembly is arranged corresponding to the second air inlet so as to adjust the air inlet area of the second air inlet; and/or the presence of a gas in the gas,

the air conditioner further comprises a third air door assembly, and the third air door assembly corresponds to the air outlet so as to adjust the air outlet area of the air outlet.

Optionally, the air inlet side is provided with a common air duct communicated with the first air duct and the second air duct, a fan is arranged in the common air duct, and the common air duct is provided with an air inlet.

Optionally, the first air duct and the second air duct are communicated through a first air passing channel, one end of the first air passing channel is communicated with the air outlet side of the first heat exchanger, and the other end of the first air passing channel is communicated with the air inlet side of the second heat exchanger;

the indoor unit further comprises a first air door, and the first air door is arranged corresponding to the first air passing channel to open or close the first air passing channel.

Optionally, the first air duct and the second air duct are arranged adjacent to each other, and the first air passing channel is formed in a common side wall of the first air duct and the second air duct;

the first air door is arranged corresponding to the second heat exchanger and is rotatably connected with the common side wall or the second heat exchanger.

Optionally, a second air door capable of opening and closing the second air duct is arranged in the second air duct, and the position where the first air passing channel is communicated with the second air duct is located between the second air door and the second heat exchanger.

Optionally, the second damper is rotatably connected to the first heat exchanger, or rotatably connected to a common side wall of the corresponding first heat exchanger, where the common side wall is a common air duct side wall of the first air duct and the second air duct.

Optionally, the first air door has a first station for blocking the first air passing passage, and the second air door has a first position for opening the second air passage, so that the first air passage and the second air passage are isolated from each other; and/or the presence of a gas in the gas,

the first air door is provided with a second station for opening the first air passing channel and closing the first air channel, and the second air door is provided with a second position for closing the second air channel, so that the air flow sequentially passes through the first heat exchanger and the second heat exchanger or sequentially passes through the second heat exchanger and the first heat exchanger; and/or the presence of a gas in the gas,

the first air door is provided with a third station for opening the first air passing channel and covering the air inlet side or the air outlet side of the second heat exchanger, and the second air door is provided with a third position for covering the air inlet side or the air outlet side of the first heat exchanger so as to reduce heat exchange between the heat exchanger and air flow.

Optionally, the air conditioner further comprises a flash evaporator, the flash evaporator is arranged on a high-low pressure pipe between the outdoor throttling device and the dehumidification throttling adjusting device, a refrigerant inlet and a refrigerant outlet of the flash evaporator are respectively communicated with the high-low pressure pipe, and the other refrigerant outlet of the flash evaporator is communicated with the medium-pressure suction inlet of the compressor through a return pipe.

Optionally, the air conditioner further comprises an economizer, the economizer is arranged on a high-low pressure pipe between the outdoor side throttling device and the dehumidification throttling adjusting device, and a refrigerant inlet and a refrigerant outlet of the economizer are respectively communicated with the high-low pressure pipe; the other refrigerant inlet of the economizer is communicated with a high-low pressure pipe through a liquid taking pipe, and the other refrigerant outlet of the economizer is communicated with a medium-pressure suction inlet of the compressor through a return pipe.

Optionally, the air conditioner further includes a conduction pipe, the conduction pipe is connected in parallel with the economizer or the flash evaporator and is disposed on the high-low pressure piping, and a third control valve is disposed on the conduction pipe.

Optionally, a fourth control valve is arranged between the flash evaporator or the economizer and a second intersection point, and the second intersection point is a connection point between one end of the conduction pipe close to the outdoor throttling device and the high-low pressure pipe.

Optionally, a fifth control valve is provided on the return conduit.

The technical scheme of the utility model, the high-low pressure piping is respectively communicated with the branch pipe and the communicating pipe, wherein, the communicating pipe is communicated with the low-pressure suction pipe or the gas side piping, the branch pipe is provided with a first control valve, and the low-pressure suction pipe or the communicating pipe is provided with a second control valve; the on-off between the high-low pressure piping and the branch pipe, and the communication pipe (low-pressure suction pipe and gas side piping) are controlled by the first control valve and the second control valve; because first control valve and second control valve are solitary control valve, compare in the cross valve, the structure is simpler, and stability and reliability are higher. In addition, the first control valve and the second control valve may be solenoid valves; the solenoid valve can still work stably and reliably under the condition that the liquid refrigerant enters, and in the four-way valve, if the liquid refrigerant enters, the working stability of the solenoid valve is influenced, so that the stability and the reliability of the operation and the state switching of the air conditioner can be improved by using the independent first control valve and the independent second control valve.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 embodiment of an air conditioner according to the present invention;

FIG. 2 is a schematic view of the first and second heat exchangers in the right side view of FIG. 1;

fig. 3 is a schematic structural diagram of a refrigerant system according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the structure of the first heat exchanger and the second heat exchanger for refrigerating;

FIG. 5 is a schematic structural diagram of the first heat exchanger and the second heat exchanger for heating;

FIG. 6 is a schematic structural diagram of a first heat exchanger for cooling and a second heat exchanger for heating;

FIG. 7 is a schematic view of the first damper in position A1 and the second damper in position B1, with both the first heat exchanger and the second heat exchanger producing heat;

FIG. 8 is a schematic view of the first damper in position A1, the second damper in position B1, and both the first heat exchanger and the second heat exchanger cooling;

FIG. 9 is a schematic view of the first damper in position A2 and the second damper in position B2;

FIG. 10 is a schematic view of the first damper in position A1 and the second damper in position B1, with the first heat exchanger cooling and the second heat exchanger heating;

FIG. 11 is a schematic view of the first damper in position A3 and the second damper in position B3;

FIG. 12 is a schematic view of the first damper in position A1 and the second damper in position B3;

fig. 13 is a schematic structural diagram of an embodiment of an air door assembly of the air conditioner of the present invention;

fig. 14 is a schematic structural view of another embodiment of an air door assembly of the air conditioner of the present invention;

FIG. 15 is a schematic structural view of an embodiment of an air door assembly of an air conditioner according to the present invention;

fig. 16 is a schematic structural view of another embodiment of a damper assembly of an air conditioner according to the present invention;

fig. 17 is a schematic structural view of a refrigerant system according to another embodiment of the air conditioner of the present invention;

fig. 18 is a schematic structural view of a refrigerant system according to another embodiment of the air conditioner of the present invention;

fig. 19 is a schematic structural view of a refrigerant system according to yet another embodiment of the air conditioner of the present invention;

fig. 20 is a schematic structural diagram of a refrigerant system according to still another embodiment of the air conditioner of the present invention.

The reference numbers illustrate:

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

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, 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 motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model mainly provides an air conditioner, which is mainly applied to the air conditioner to increase the function of the air conditioner, and users in different rooms can obtain air with different temperatures (cold air and/or hot air) according to the needs by arranging a first air channel and a second air channel which are mutually isolated, thereby meeting the requirements of temperature regulation; the areas of the first air inlet 710, the second air inlet 720 and the air outlet 730 are set to be adjustable, so that the cold quantity, the heat quantity and the air quantity required by each room are adjustable; through the arrangement of the first air door 410, the second air door 420 and the first air passing passage, the air conditioner can realize different required modes with high efficiency. The air conditioner can be used for indoor units, but is not limited to be placed indoors, and temperature adjustment of different rooms can be realized only by leading air outlets 730 of different air outlet devices 700 to different rooms; of course, in some embodiments, the air outlets 730 of different air outlets 700 may be disposed at different positions in the same room, so as to adjust the temperature of different areas in the same room differently.

Hereinafter, a specific structure of the air conditioner will be mainly described, and it is worth explaining that the first, second and third stations of the first damper and the first, second and third positions of the second damper can be more intuitively expressed in the drawings; in the following embodiments and the drawings in the specification, corresponding reference names are respectively set, such as: a first station (a1 station), a second station (a2 station), and a third station (A3 station), and a first position (B1 station), a second position (B2 station), and a third position (B3 station) of the second damper.

Referring to fig. 1 to 3, in an embodiment of the present invention, the air conditioner includes:

the air conditioner comprises a shell 200, wherein the shell 200 is provided with an air inlet side, an air outlet side, a first air channel and a second air channel which are communicated with the air inlet side and the air outlet side;

a first heat exchanger 310 is arranged in the first air duct, and a second heat exchanger 320 is arranged in the second air duct;

the first air duct and the second air duct are communicated through a first air passing channel, one end of the first air passing channel is communicated with the air outlet side of the first heat exchanger 310, and the other end of the first air passing channel is communicated with the air inlet side of the second heat exchanger 320;

and a first damper 410, wherein the first damper 410 is arranged corresponding to the first air passing passage to open or close the first air passing passage.

Specifically, in the present embodiment, the overall shape of the housing 200 may be various, such as a rectangular parallelepiped shape, a cylindrical shape, and the like. The first air duct and the second air duct are respectively communicated with the air inlet side and the air outlet side, wherein the relative positions of the first air duct and the second air duct can be various, such as far apart, and can also be arranged adjacently. The first heat exchanger 310 and the second heat exchanger 320 can both generate heat and heat, that is, both can generate heat simultaneously, or generate heat by one cooling. In this embodiment, for example, the first air duct and the second air duct are arranged in parallel, and a common air duct side wall is provided between the first air duct and the second air duct. The first air passage communicating the first air passage and the second air passage may have various forms, and one end of the first air passage communicates with the air outlet side of the first heat exchanger 310 and the other end communicates with the air inlet side of the second heat exchanger 320. When the first air door 410 closes the first air passing channel, the first air channel and the second air channel are independent of each other, air in the first air channel exchanges heat with the first heat exchanger 310 and then flows to the air outlet side, and air in the second air channel exchanges heat with the second heat exchanger 320 and then flows to the air outlet side.

After the first air door 410 opens the first air passing channel, the air in the first air duct can exchange heat with the first heat exchanger 310, then flows into the second air duct through the first air passing channel, and then flows to the air outlet side after exchanging heat with the second heat exchanger 320. When the first heat exchanger 310 refrigerates and the second heat exchanger 320 heats, the air firstly exchanges heat and dehumidifies through the first heat exchanger 310, and then absorbs heat and returns to the temperature through the second heat exchanger 320.

In this embodiment, the first air duct and the second air duct are respectively communicated with the air inlet side and the air outlet side, the first heat exchanger 310 is arranged in the first air duct, the second heat exchanger 320 is arranged in the second air duct, and the first air passing channel communicated with the air outlet side of the first heat exchanger 310 and the air inlet side of the second heat exchanger 320 is arranged at the same time; when the first air door 410 is closed, air passes through the first heat exchanger 310 and the second heat exchanger 320 respectively, and cooling or heating can be realized; when the first damper 410 is opened, the air can pass through the first heat exchanger 310 and then the second heat exchanger 320, and when the first heat exchanger 310 refrigerates and the second heat exchanger 320 heats, dehumidification and reheating can be realized; so for the air conditioner both can refrigerate, heat, also can realize the dehumidification reheat, make the function of air conditioner increase, can satisfy user's demand.

In some embodiments, in order to improve the compactness and the space utilization rate of the structure, the first air duct and the second air duct are arranged adjacently, and the first air passing channel is arranged on a common side wall of the first air duct and the second air duct. In this embodiment, the first air duct and the second air duct are arranged in parallel, and are separated by the partition plate. The first air passing passage is formed in the partition, and the first damper 410 is movably disposed corresponding to the first air passing passage to open and close the first air passing passage. Thus, the space in the housing 200 is fully and reasonably utilized, and meanwhile, under the condition that the first air passing channel is opened, the air flow can smoothly circulate between the first air channel and the second air channel due to the fact that the length of the first air passing channel is very short.

In some embodiments, to further improve the space utilization and the compactness of the structure, the first damper 410 is disposed corresponding to the position of the second heat exchanger 320 and is rotatably connected to the common sidewall or the second heat exchanger 320. A second heat exchanger 320 is disposed within the second air duct adjacent the first air duct, the second heat exchanger 320 being connectable to the common side wall. When the first air door 410 is rotatably connected with the second heat exchanger 320, the first air door 410 can be connected at a plurality of positions, such as a plurality of positions in the length direction or the width direction of the second heat exchanger 320, so as to block the first air passing passage. In some embodiments, in order to make the utilization rate of the first damper 410 higher, the first damper 410 may be rotatably connected to a side of the second heat exchanger 320 close to the second air duct (common side wall), so that the first damper 410 may selectively block any one of the first air passing passage, the first air duct and the second air duct (air inlet side of the second heat exchanger 320), and thus, the rotation of the first damper 410 may realize the adjustment of the air duct. Similarly, when the first damper 410 is rotatably disposed on the common sidewall, the first damper 410 is rotatably connected to the side of the first air passing channel, so that the utilization rate of the first damper 410 can be greatly improved. Similarly, the first damper 410 is rotatably connected to the common sidewall, so that the first damper 410 can selectively block any one of the first air passing channel, the first air duct and the second air duct (the air inlet side or the air outlet side of the second heat exchanger 320).

In some embodiments, in order to improve the adaptability of the air supply, that is, in order to meet various requirements of users, the air conditioner further includes an air outlet device 700, the air outlet device 700 is disposed on the air outlet side, the air outlet device 700 has a first air inlet 710, a second air inlet 720 and an air outlet 730, the first air inlet 710 is communicated with the first air duct, and the second air inlet 720 is communicated with the second air duct. The first air inlet 710 and the second air inlet 720 of the air outlet device 700 are respectively arranged in the first air channel and the second air channel, so that the air outlet device 700 can simultaneously take air from different air channels, and the air flowing out of the air outlet 730 can have air in the first air channel and air in the second air channel.

In order to adjust the amount of air taken from the first air flow and the second air duct by the air outlet device 700, the air conditioner further comprises:

the first air door 410 assembly is arranged corresponding to the first air inlet 710 so as to adjust the air inlet area of the first air inlet 710; and/or the presence of a gas in the gas,

and a second air door 420 assembly disposed corresponding to the second air inlet 720 to adjust the air inlet area of the second air inlet 720.

In order to adjust the total air outlet amount of the air outlet device 700, the air conditioner further includes a third air door assembly 800, and the third air door assembly 800 is disposed corresponding to the air outlet 730 to adjust the air outlet area of the air outlet 730.

The first, second and

third damper assemblies

410, 420, 800 may be identical or different in construction and form, and several types of damper assemblies 800 are described below, with the first, second and

third damper assemblies

410, 420 and 800 being optional.

In the first type of damper assembly 800, referring to fig. 13 and 14, the inlet or outlet 730 may be circular or square, the damper assembly 800 may be a baffle 810, and the baffle 810 may be positioned at a desired position of the inlet or outlet 730 to adjust an effective air passing area of the inlet or outlet 730.

In the second type of damper assembly 800, referring to fig. 15 and 16, the inlet or outlet 730 is desirably circular or square, such as in a circular arrangement. The second damper assembly 800 includes a plurality of vanes 820 and a drive structure, and the plurality of vanes 820 may be enclosed or spread as the drive structure is driven. When the air outlet area or the air inlet area needs to be increased, the plurality of blades 820 are driven to move to the periphery at the same time, so that the area formed by enclosing the plurality of blades 820 is increased, and the ventilation area of the air port is increased; when the air outlet area or the air inlet area needs to be reduced, the plurality of blades 820 are driven to move towards the middle part, so that the area formed by enclosing the plurality of blades 820 is reduced, and the ventilation area of the air port is reduced.

In order to improve the compactness and the reliability of the structure of the air conditioner, the air inlet side is provided with a common air channel communicated with the first air channel and the second air channel, a fan 600 is arranged in the common air channel, and the common air channel is provided with an air inlet. The shared air duct is located on the air inlet side, and through the arrangement of the air inlet, air outside the air duct can enter the shared air duct through the air inlet, and then respectively enter the first air duct and the second air duct through the shared air duct, and heat exchange is carried out in the first air duct and the second air duct. Through setting up fan 600 in the wind channel of sharing for the air current can be quick be sucked to the wind channel of sharing, and be carried to first wind channel and second wind channel, so, when making fan 600's work efficiency obtain increasing by a wide margin, also abundant reasonable has utilized the wind channel space, makes the compact structure of air conditioner, and stability is reliable. In addition, through setting up fan 600 in the air inlet side, also be convenient for the operator to the maintenance of fan 600, overhaul and change.

Based on the above air duct, the working states of the first heat exchanger 310 and the second heat exchanger 320 enable the air outlet 730 to deliver different forms of air flows, which will be described below in brief.

When the first heat exchanger 310 and the second heat exchanger 320 refrigerate, air respectively exchanges heat with the first heat exchanger 310 and the second heat exchanger 320 and then flows to the air outlet side for refrigeration; when the first heat exchanger 310 and the second heat exchanger 320 are used for heating, air respectively exchanges heat with the first heat exchanger 310 and the second heat exchanger 320 and then flows to the air outlet side for heating; when the first heat exchanger 310 heats (cools), and the second heat exchanger 320 cools (heats), the ratio of cold air and hot air in the mixed outlet air can be controlled by controlling the first air door 410 assembly and the second air door 420 assembly, so as to control the temperature of the mixed air flowing out of the air outlet 730. When the quantity of air-out subassembly is a plurality of, and set up respectively when the position of difference, can satisfy different crowds, different users' demand.

In some embodiments, in order to make the structural change of the air duct more flexible to meet the requirements of different users, a second damper 420 capable of opening and closing the second air duct is disposed in the second air duct, and the position where the first air passing passage communicates with the second air duct is located between the second damper 420 and the second heat exchanger 320. The second air door 420 is arranged close to the air inlet side, and a second air passing channel is arranged on one side, close to the air inlet side, of the second air door 420. A shared air duct side wall can be arranged between the second air door 420 and the air inlet side, or the air duct side wall can be empty, when the shared air duct side wall is arranged between the second air door 420 and the air inlet side, the second air passing channel is arranged on the shared side wall, and the second air door 420 can open and close the second air passing channel; when the first air duct and the second air duct are empty, that is, there is no common side wall between the first air duct and the second air duct, the second air passing passage may be an area that can be blocked by the second air door 420, that is, when the second air door 420 extends to the air inlet side along the common side wall of the first air duct and the second air duct, the second air door 420 is the common side wall at this time, so as to extend the first air duct and the second air duct. In this way, the second damper 420 may block any one of the first air duct (the air inlet side or the air outlet side of the first heat exchanger 310), the second air duct, and the second air passing passage. Therefore, the structural change of the air duct is more flexible, and the air duct is matched with the position of the first air door 410 to meet different requirements of users.

The second damper 420 may be installed in a plurality of ways, and the second damper 420 is rotatably connected to the first heat exchanger 310, or rotatably connected to a common sidewall corresponding to the first heat exchanger 310, where the common sidewall is a common air duct sidewall of the first air duct and the second air duct. The specific connection manner is various, such as hinge connection, pivot connection, etc., and will not be described herein.

Depending on the position of the first damper 410 and the second damper 420, the duct may be changed to a variety of forms as required by the operating conditions, some of which are selected as follows:

in the first form, the first damper 410 has an a1 position for blocking the first air passage and the second damper 420 has a B1 position for opening the second air passage to isolate the first and second air passages from each other. At this time, the second air door 420 blocks the second air passage, so that the first air duct and the second air duct are isolated from each other, and thus, the air flows in the first air duct and the second air duct do not interfere with each other and operate independently. This condition may be used for both cooling alone and heating alone, where the first heat exchanger 310 and/or the second heat exchanger 320 may be selectively turned on as the case may be.

In the second form, the first damper 410 has an a2 position that opens the first air passage and closes the first air path, and the second damper 420 has a B2 position that closes the second air path, so that the air flow passes through the first heat exchanger 310 and the second heat exchanger 320 in sequence, or the second heat exchanger 320 and the first heat exchanger 310 in sequence. In the following, the first heat exchanger 310 is taken as an example close to the air inlet side, and in order to make the air flow smoother, the air flow first passes through the first heat exchanger 310 and then passes through the second heat exchanger 320. At this time, the first heat exchanger 310 may be set to heat, the second heat exchanger 320 may be set to cool, and at this time, the air is reheated and dehumidified; alternatively, the first heat exchanger 310 performs cooling and the second heat exchanger 320 performs heating, and at this time, the air is dehumidified and reheated. Under the working condition, the temperature control dehumidification of the air can be realized, and the requirements of users can be met.

In a third form, the first damper 410 has an a3 station for opening the first air passing channel and covering the air inlet side or the air outlet side of the second heat exchanger 320, and the second damper 420 has a B3 station for covering the air inlet side or the air outlet side of the first heat exchanger 310, so as to reduce the heat exchange between the heat exchangers and the air flow. In this form, the air in the air duct that can exchange heat with the first and

second heat exchangers

310, 320 is very small, so that the energy generated by the first and

second heat exchangers

310, 320 has as little effect on the indoor temperature as possible. This form is very suitable for powerful defrosting, that is, both the first heat exchanger 310 and the second heat exchanger 320 can be used for cooling, and the outdoor heat exchanger 141 is used for heating, so that the outdoor heat exchanger 141 can defrost quickly.

In a fourth form, the first damper 410 has an a1 station for blocking the first air passing passage, the second damper 420 has a B3 station for covering the air inlet side or the air outlet side of the first heat exchanger 310, the first heat exchanger 310 cools, and the second heat exchanger 320 heats. At this time, temperature-controlled defrosting can be performed, the refrigerated first heat exchanger 310 is shielded, the amount of heat exchange between the airflow and the air-cooled first heat exchanger is reduced as much as possible, and the second heat exchanger 320 is opened, so that the airflow and the heated second heat exchanger 320 exchange heat, and thus, the outdoor heat exchanger 141 and the second heat exchanger 320 heat simultaneously, defrosting can be performed, indoor temperature can be controlled within a preset range, and the improvement of comfort level of users is facilitated.

Another air conditioner in which a first duct and a second duct are independent from each other, the air conditioner comprising:

the air conditioner comprises a shell 200, wherein the shell 200 is provided with an air inlet side, an air outlet side, a first air channel and a second air channel, the first air channel and the second air channel are communicated with the air inlet side and the air outlet side, and the first air channel and the second air channel are mutually independent;

air-out device 700, air-out device 700 set up in the air-out side, air-out device 700 has first air intake 710, second air intake 720 and air outlet 730, first air intake 710 with first wind channel intercommunication, second air intake 720 with the second wind channel intercommunication.

Specifically, in this embodiment, two independent air ducts are provided in the housing 200, and a heat exchanger capable of being independently controlled is provided in each air duct (the cooling and heating of the two heat exchangers do not interfere with each other). The air outlet device 700 can obtain air in the first air duct and the second air duct according to requirements. When one of the first heat exchanger 310 and the second heat exchanger 320 heats and the other cools (taking the first heat exchange cooling and the second heat exchanger 320 heats as an example), the air volume can be controlled by controlling the ventilation areas of the first air inlet 710, the second air inlet 720 and the air outlet 730, the amount of cold air flowing out of the air outlet 730 can be adjusted by controlling the air inlet volume of the first air inlet 710, and the amount of hot air flowing out of the air outlet 730 can be adjusted by controlling the air inlet volume of the second air inlet 720, so that the temperature of air flowing out of the air outlet 730 can be controlled by controlling the ventilation areas of the first air inlet 710 and the second air inlet 720, and thus, the air conditioner can meet the requirements of different users.

The air conditioner further includes:

the first air door 410 assembly is arranged corresponding to the first air inlet 710 so as to adjust the air inlet area of the first air inlet 710; and/or the second air door 420 assembly is arranged corresponding to the second air inlet 720 to adjust the air inlet area of the second air inlet 720. The air conditioner further comprises a third air door assembly 800, wherein the third air door assembly 800 corresponds to the air outlet 730 so as to adjust the air outlet area of the air outlet 730. With regard to the specific structure of the first damper 410 assembly, the second damper 420 assembly and the third damper assembly 800, reference is made to the above embodiments, and details are not repeated here.

The air inlet side is provided with a shared air channel communicated with the first air channel and the second air channel, a fan 600 is arranged in the shared air channel, and the shared air channel is provided with an air inlet.

The plurality of air outlet devices 700 are respectively communicated with the air outlet side of the air conditioner, so that each air outlet device 700 can take air from the first air duct and the second air duct. The plurality of air outlet devices 700 may supply air to different rooms in different rooms, or may be installed at different locations in the same room to supply air to different areas.

The utility model discloses still provide an air conditioner, this air conditioner includes off-premises station and air conditioner, and the concrete structure of this air conditioner refers to above-mentioned embodiment, because this air conditioner has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here. The first heat exchanger 310 of the air conditioner performs cooling or heating, and the second heat exchanger 320 of the air conditioner performs cooling or heating.

An air conditioner system in which the first heat exchanger 310 and the second heat exchanger 320 can simultaneously perform heating and cooling or one heating and one cooling will be described.

An air conditioner includes an outdoor unit including a compressor 110 and an outdoor heat exchanger 141, and an indoor unit including a first heat exchanger 310 and a dehumidification throttle adjusting device;

the air conditioner further includes: a discharge pipe 111 connected to a discharge side of the compressor 110, a low-pressure suction pipe 113 connected to a low-pressure suction side of the compressor 110, a liquid-side pipe 140 connecting the discharge pipe 111, the outdoor heat exchanger 141, the dehumidification throttle control device, and the first heat exchanger 310 in this order, and a gas-side pipe 160 connecting the first heat exchanger 310 and the low-pressure suction pipe 113, thereby forming a dehumidification circuit;

the indoor unit further comprises a second heat exchanger 320, a reheating throttling regulation device and a heat circulation device for sending heat or cold of the indoor unit into the room;

the air conditioner further includes a high-low pressure pipe 150 and a branch pipe 112 branched from the discharge pipe 111, wherein the high-low pressure pipe 150 forms a reheat circuit by sequentially connecting a first intersection point of the liquid side pipe 140, the reheat throttle control device, the second heat exchanger 320, and the branch pipe 112, the first intersection point being located between the dehumidification throttle control device and the outdoor heat exchanger 141;

the air conditioner further comprises a communicating pipe 114, one end of the communicating pipe 114 is communicated with the high-low pressure piping 150, and the other end is communicated with the air side piping 160 or the low pressure suction pipe 113;

and a three-way valve having three ports that communicate with the high-low pressure pipe 150, the branch pipe 112, and the communication pipe 114, respectively, so that the high-low pressure pipe 150 communicates with the communication pipe 114 or communicates with the branch pipe 112.

Wherein the indoor unit includes the air conditioner mentioned in the above embodiment. The three-way valve may be replaced by two-way valves (a first control valve and a second control valve), that is, a two-way valve (a first control valve 170) is provided between the high-low pressure pipe 150 and the branch pipe 112, and a two-way valve (a second control valve 180) is provided between the high-low pressure pipe 150 and the communicating pipe 114, so that the communication between the high-low pressure pipe 150 and the branch pipe 112 is independent of the communication between the high-low pressure pipe 150 and the communicating pipe 114.

In order to realize more various forms of the first and

second heat exchangers

310 and 320, the outdoor unit further includes a first switch 131, the first switch 131 being switchable between a first switching state of the first switch 131 and a second switching state of the first switch 131,

in the first switching state, the first switch 131 connects the liquid-side pipe 140 to the suction pipe 113 and the gas-side pipe 160 to the discharge pipe 111,

in the second switching state, the first switch 131 connects the liquid-side pipe 140 to the discharge pipe 111 and connects the gas-side pipe 160 to the suction pipe 113. In this way, the operation states (heating or cooling) of the first heat exchanger 310 and the second heat exchanger 320 can be adjusted according to the requirements.

Regarding the operation mode of the air conditioner, the cooling mode:

the high-temperature and high-pressure refrigerant is discharged from the discharge pipe 111, passes through the first switch 131, the liquid-side pipe 140, and the outdoor heat exchanger in this order, and then enters the first heat exchanger and the second heat exchanger, respectively, to be cooled. A portion flows out of the second heat exchanger, passes through the gas-side piping 160 and the first switch 131 (which may not be present in some embodiments), and flows into the gas-liquid separator; the other part flows out of the first heat exchanger, passes through a high-pressure and low-pressure piping 150 and then enters the communicating pipe 114, and when the communicating pipe 114 is communicated with the low-pressure suction pipe, the refrigerant enters the gas-liquid separator through the low-pressure suction pipe 113; when the communication pipe 114 communicates with the gas-side pipe 160, the refrigerant flows into the gas-side pipe 160 through the communication pipe 114, and flows into the gas-liquid separator through the gas-side pipe 160. During this process, the first control valve 170 is closed and the second control valve 180 is opened. The three-way valve 190 connects the high-low pressure piping connection pipe and closes the high-low pressure piping and the branch pipe.

Heating mode:

the high-temperature and high-pressure refrigerant is discharged from the discharge pipe 111, and a part of the refrigerant passes through the first heat exchanger 131 (which may not be provided in some embodiments) and the gas-side piping 160 in sequence, then enters the second heat exchanger for heating, flows out of the second heat exchanger, and enters the liquid-side piping 140; the other part enters the reheat heat exchanger through the branch pipe 112 and the high-low pressure pipe 150 in this order, is heated, flows out of the reheat heat exchanger, enters the liquid side pipe 140, passes through the economizer 921, the outdoor side heat exchanger, and the first switch 131, and flows into the gas-liquid separator. During this process, the first control valve 170 is opened and the second control valve 180 is closed. The three-way valve 190 closes the high-low pressure piping connection pipe and connects the high-low pressure piping and the branch pipe.

Constant temperature dehumidification mode:

the high-temperature and high-pressure refrigerant is discharged from the discharge pipe 111, and a portion of the refrigerant passes through the first switch 131 (which may not be provided in some embodiments), the liquid-side pipe 140, the outdoor-side heat exchanger, and the economizer 921 in this order, enters the second heat exchanger to be cooled, and then flows into the gas-liquid separator through the gas-side pipe 160 and the first switch 131. The other part of the refrigerant passes through the branch pipe 112 and the high-low pressure pipe 150 in this order, enters the reheat heat exchanger to perform heating, and then flows into the second heat exchanger to perform cooling. During this process, the first control valve 170 is opened and the second control valve 180 is closed. The three-way valve 190 closes the high-low pressure piping connection pipe and connects the high-low pressure piping and the branch pipe.

Referring to fig. 17 to 19, in some embodiments, in order to improve the performance of the compressor (e.g., the heating capacity in a low-temperature environment), the compressor may be supplemented with air in various ways, and the flash evaporator 911 and the economizer 921 are respectively provided as an example.

The flash evaporator 911 is provided in the high-low pressure piping and is located between the outdoor throttle device 142 and the indoor throttle device. The refrigerant inlet and one refrigerant outlet of the flash evaporator 911 are respectively communicated with the high-pressure and low-pressure piping at both ends, and the other refrigerant outlet is communicated with the medium-pressure return port of the compressor through a return pipe 917. A fifth control valve 916 may be provided in the return line 917 to control the on/off thereof.

The economizer 921 is provided in the high-low pressure pipe and is located between the outdoor-side throttling device 142 and the indoor throttling device. One refrigerant inlet and one refrigerant outlet of the economizer 921 are connected to high and low pressure pipes at both ends, respectively, and the other refrigerant outlet is connected to a medium pressure return port of the compressor through a return pipe 917. The other refrigerant inlet of the economizer 921 is connected to a high-pressure pipe and a low-pressure pipe via a liquid take-out pipe 923. Get liquid and can divide into and get liquid two kinds of condition down on, can set up according to actual demand. The liquid intake pipe 923 is provided with an economizer 922, such as an electronic expansion valve.

In some embodiments, in order to selectively use the flash vessel 911 and the economizer 921, a conducting pipe 915 is further provided in parallel with the flash vessel 911 or the economizer 921, both ends of the conducting pipe 915 are respectively communicated with the high-pressure and low-pressure pipes, and a third control valve 912 is provided on the conducting pipe 915. In some embodiments, to further improve the parallel effect of the conduction pipe 915 with the economizer 921 and the flash evaporator 911, a fourth control valve 913 is provided between the flash evaporator 911 and the outdoor side throttling device 142, or between the economizer 921 and the outdoor side throttling device 142.

When the flash evaporator 911 or the economizer 921 is needed to be used, the third control valve 912 is closed, the conducting pipe 915 is blocked, and the fourth control valve 913 and the fifth control valve 916 are opened to enable refrigerant to pass through the flash evaporator 911 or the economizer 921; when the flash tank 911 or the economizer 921 is not required to be used, the third control valve 912 is opened, and the fourth control valve 913 and the fifth control valve 916 are closed, so that the refrigerant passes through the conduit 915 without passing through the economizer 921 and the flash tank 911.

The first, second, third, fourth, and

fifth control valves

912, 913, and 916 may be solenoid valves.

Aiming at the air conditioner, the application provides a control method of the air conditioner to meet the air supply requirements of different users, and the control method of the air conditioner comprises the following steps:

acquiring a mode instruction;

specifically, in this embodiment, there are various modes for acquiring the mode instruction, and the mode instruction may be acquired from an external terminal, such as a mobile phone, a remote controller, and the like; can also be obtained from other household electrical appliance equipment, such as an electric fan, an air purifier and the like; the calculation can also be carried out by detecting the self operating parameters or detecting the external environmental parameters, such as the indoor temperature; of course, the information can also be acquired from the cloud.

The mode command may include cooling, heating, dehumidifying, temperature-controlled dehumidifying, defrosting, and non-sensible defrosting, etc.

Adjusting the working states of the first heat exchanger 310 and the second heat exchanger 320 according to the mode command; and controlling the compressor 110, the fan 600, the first heat exchanger 310, the second heat exchanger 320 and the like to work according to different mode instructions. For example, during heating, the first heat exchanger 310 and/or the second heat exchanger 320 generate heat, and during cooling, the first heat exchanger 310 and/or the second heat exchanger 320 generate cooling; when the temperature control dehumidification is performed, the first heat exchanger 310 performs cooling, the second heat exchanger 320 performs heating, and the like.

The positions of the first damper 410 and the second damper 420 are adjusted according to the mode instructions. In different working modes, the first damper 410 and the second damper 420 correspond to different positions respectively, so as to meet the requirements of the air duct under different working conditions and modes.

In this embodiment, through setting up first air door 410 and second air door 420 to make first air door 410 and second air door 420's position adjustable, realize different forms's wind channel, thereby satisfy the demand to the wind channel under the different modes, so, improve the adaptability of air conditioner by a wide margin, be favorable to satisfying people's different demands.

The following is a description of the requirements of the different operating modes:

the mode command comprises a refrigeration mode command, and the working states of the first heat exchanger 310 and the second heat exchanger 320 are adjusted according to the mode command; the step of adjusting the positions of the first damper 410 and the second damper 420 according to the mode instructions includes:

adjusting the first heat exchanger 310 and/or the second heat exchanger 320 to cool according to the cooling mode command;

the first air door 410 is adjusted to be in the A1 position for blocking the first air passing channel, and the second air door 420 is adjusted to be in the B1 position for opening the second air channel, so that the first air channel and the second air channel are isolated from each other.

When a user needs to refrigerate, one or two of the first heat exchanger 310 and the second heat exchanger 320 refrigerate, the first air door 410 is adjusted to block the first air passage, and the second air passage of the second air door 420 is adjusted to enable the first air passage and the second air passage to be independent from each other, so that air flow can smoothly pass through the first air passage and the second air passage, the phenomenon of air mixing does not exist, and the air flow can be efficiently subjected to heat exchange and conveying.

It should be noted that, under the condition that the first air duct and the second air duct are independent from each other, when the number of the air supply devices is multiple and the requirements of the customers corresponding to the multiple air supply devices are different, the first heat exchanger 310 may be adjusted to cool, and the second heat exchanger 320 may be adjusted to heat, so that the air supply temperature of the air outlet 730 of the air supply device may be adjusted by controlling the air intake amount in the first air duct and the second air duct, thereby meeting the requirements of different users. Meanwhile, the mode can also realize temperature control and dehumidification.

The mode command comprises a dehumidification and reheat mode command, and the working states of the first heat exchanger 310 and the second heat exchanger 320 are adjusted according to the mode command; the step of adjusting the positions of the first damper 410 and the second damper 420 according to the mode instructions includes:

adjusting the first heat exchanger 310 to cool and the second heat exchanger 320 to heat according to the dehumidification and reheat mode command;

the first damper 410 is adjusted to the a2 position opening the first air passage and closing the first air duct, and the second damper 420 is adjusted to the B2 position closing the second air duct, so that the air flow passes through the first heat exchanger 310 and the second heat exchanger 320 in sequence.

When a user needs temperature control dehumidification, the first air door 410 is adjusted to close the first air duct, and the second air door 420 is adjusted to close the second air duct, so that after entering the common air duct 530 from the air inlet of the common air duct 530, air firstly passes through the first heat exchanger 310 for dehumidification, and because the first air duct of the first air door 410 enters the second air duct from the first air passing passage, the air after heat exchange with the first heat exchanger 310 exchanges heat with the second heat exchanger 320 in the second air duct under the action of the fan 600, and the temperature of the air is adjusted to a required temperature. In this way, the air exchanges heat with the first heat exchanger 310 first and then exchanges heat with the second heat exchanger 320, so as to realize the process of dehumidification and reheating.

When a user needs to defrost the outdoor heat exchanger 141, the defrosting mode includes two conditions, one is common powerful defrosting, in this mode, the first heat exchanger 310 and the second heat exchanger 320 both refrigerate, and the outdoor heat exchanger 141 heats; the other mode is no sensible frost, in this mode, the first heat exchanger 310 cools, the second heat exchanger 320 heats, and the outdoor heat exchanger 141 heats.

Normal powerful defrosting is performed, the mode command comprises a defrosting mode command, and the working states of the first heat exchanger 310 and the second heat exchanger 320 are adjusted according to the mode command; the step of adjusting the positions of the first damper 410 and the second damper 420 according to the mode instructions includes:

adjusting the first heat exchanger 310 and the second heat exchanger 320 to refrigerate according to the defrosting mode command;

the first damper 410 is adjusted to the a3 station for opening the first air passing channel and covering the air inlet side or the air outlet side of the second heat exchanger 320, and the second damper 420 is adjusted to the B3 station for covering the air inlet side or the air outlet side of the first heat exchanger 310.

By setting both the first heat exchanger 310 and the second heat exchanger 320 to cool, the outdoor heat exchanger 141 is heated strongly, so that defrosting of the outdoor heat exchanger 141 can be performed rapidly. At this time, in order to reduce the amount of low-temperature air, the air inlet side or the air outlet side of the first heat exchanger 310 is blocked by the second damper 420; the air inlet side or the air outlet side of the second heat exchanger 320 is blocked by the first air door 410, and the air is prevented from exchanging heat with the first heat exchanger 310 and the second heat exchanger 320, so that the formation of cold air and the influence on the indoor temperature are reduced to the greatest extent. For example, the first damper 410 blocks the air inlet side of the second heat exchanger 320, and the second damper 420 blocks the air inlet side of the first heat exchanger 310.

The method comprises the steps of performing non-sensible defrosting, wherein the mode instruction comprises a non-sensible defrosting mode instruction, and the working states of a first heat exchanger 310 and a second heat exchanger 320 are adjusted according to the mode instruction; the step of adjusting the positions of the first damper 410 and the second damper 420 according to the mode instructions includes:

adjusting the first heat exchanger 310 to cool and the second heat exchanger 320 to heat according to the non-sensible defrosting mode command;

the first air door 410 is adjusted to the A1 station for blocking the first air passing channel, and the second air door 420 is adjusted to the B3 station for covering the air inlet side or the air outlet side of the first heat exchanger 310.

In this embodiment, the first heat exchanger 310 refrigerates, and both the second heat exchanger 320 and the outdoor heat exchanger 141 heat, at this time, the outdoor unit defrosts, and meanwhile, by adjusting the air duct, the air passes through the second heat exchanger 320 and does not pass through the first heat exchanger 310, so that the indoor temperature can be continuously heated. In this way, when the user cannot perceive the defrosting operation, the outdoor unit is defrosted. In the process, the second air door 420 blocks the air inlet side or the air outlet side of the first heat exchanger 310, and the first air door 410 blocks the first air flow passage, so that air can only pass through the second air passage and exchange heat with the second heat exchanger 320. Therefore, the air is prevented from exchanging heat and cooling with the first heat exchanger 310, and the air exchanges heat with the second heat exchanger 320 and heats up, so that the non-inductive defrosting is completed.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. An air conditioner is characterized by comprising an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compression mechanism and an outdoor heat exchanger, and the indoor unit comprises a first heat exchanger and a dehumidification throttling regulation device;

the indoor unit further includes:

2. The air conditioner according to claim 1,

the outdoor unit further comprises a first switch switchable between a first switch first switching state and a first switch second switching state,

3. The air conditioner according to claim 1, further comprising:

4. The air conditioner according to claim 1, wherein the air intake side has a common duct communicating the first duct and the second duct, a fan being provided in the common duct, and the common duct having an air inlet.

5. The air conditioner according to claim 1,

the first air duct and the second air duct are communicated through a first air passing channel, one end of the first air passing channel is communicated with the air outlet side of the first heat exchanger, and the other end of the first air passing channel is communicated with the air inlet side of the second heat exchanger;

6. The air conditioner according to claim 5, wherein the first air duct and the second air duct are disposed adjacent to each other, and the first air passing passage is provided in a common side wall of the first air duct and the second air duct;

7. The air conditioner according to claim 5 or 6, wherein a second damper is provided in the second air duct to open and close the second air duct, and the position where the first air passing passage communicates with the second air duct is between the second damper and the second heat exchanger.

8. The air conditioner according to claim 7, wherein the second damper is rotatably connected to the first heat exchanger or a common side wall of the corresponding first heat exchanger, wherein the common side wall is a common duct side wall of the first duct and the second duct.

9. The air conditioner according to claim 7, wherein said first damper has a first position for blocking the first air passage, and said second damper has a first position for opening the second air passage to isolate said first air passage from said second air passage; and/or the presence of a gas in the gas,

10. The air conditioner according to claim 8, wherein the air intake side has a common duct communicating the first duct and the second duct, a fan being provided in the common duct, and the common duct having an air inlet.

11. The air conditioner as claimed in claim 1, further comprising a flash evaporator disposed on the high-low pressure pipe between the outdoor side throttling device and the dehumidification throttling adjustment device, wherein a refrigerant inlet and a refrigerant outlet of the flash evaporator are respectively communicated with the high-low pressure pipe, and the other refrigerant outlet of the flash evaporator is communicated with the medium-pressure suction inlet of the compressor through a return pipe.

12. The air conditioner as claimed in claim 1, further comprising an economizer disposed on a high-low pressure pipe between the outdoor side throttling device and the dehumidification throttling regulation device, wherein a refrigerant inlet and a refrigerant outlet of the economizer are respectively communicated with the high-low pressure pipe; the other refrigerant inlet of the economizer is communicated with a high-low pressure pipe through a liquid taking pipe, and the other refrigerant outlet of the economizer is communicated with a medium-pressure suction inlet of the compressor through a return pipe.

13. The air conditioner according to claim 11 or 12, further comprising a conduction pipe provided in the high-low pressure pipe in parallel with the economizer or the flash evaporator, wherein a third control valve is provided in the conduction pipe.

14. The air conditioner according to claim 13, wherein a fourth control valve is provided between the flash evaporator or the economizer and a second intersection point, and the second intersection point is a connection point between one end of the conduit close to the outdoor throttle device and the high-low pressure pipe.

15. An air conditioner according to claim 11 or 12, wherein a fifth control valve is provided on said return pipe.