Air conditioner

Abstract

The present invention discloses an air conditioner, which includes an outer unit and an inner unit. The outer unit includes a compression mechanism and an outer heat exchanger, and the inner unit includes a first heat exchanger and a dehumidification throttling adjustment device; the air conditioner further includes: a discharge pipe connected to the discharge side of the compression mechanism, a low-pressure suction pipe connected to the low-pressure suction side of the compression mechanism, a liquid-side pipe, and a gas-side pipe connecting the first heat exchanger and the low-pressure suction pipe, thereby forming a dehumidification circuit; the inner unit further includes a second heat exchanger and a reheating throttling adjustment device; the air conditioner further includes a high and low pressure pipe, and the high and low pressure pipe connects the first intersection point of the liquid-side pipe, the reheating throttling adjustment device, the second heat exchanger and the discharge pipe in sequence, thereby forming a reheating circuit, wherein the first intersection point is located between the dehumidification throttling adjustment device and the outer heat exchanger. The technical solution of the present invention is beneficial to improving the adaptability of the air conditioning system.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an air conditioner. Background Art

[0002] With the improvement of people's living standards, the requirements for air conditioners are also getting higher and higher. Due to the complexity of the weather, people sometimes need cooling capacity to lower the temperature, sometimes need heating capacity to warm up, and sometimes need to dehumidify under the condition of little temperature change. However, traditional air conditioners have a single function and are difficult to meet people's needs. Summary of the Invention

[0003] The main object of the present invention is to provide an air conditioner, aiming to improve the adaptability of the air conditioner to meet the needs of users.

[0004] To achieve the above object, the air conditioner proposed by the present invention includes an outer unit and an inner unit. The outer unit includes a compression mechanism and an outer heat exchanger, and the inner unit includes a first heat exchanger and a dehumidification throttling adjustment device;

[0005] The air conditioner further includes: an exhaust pipe connected to the discharge side of the compression mechanism, a low-pressure suction pipe connected to the low-pressure suction side of the compression mechanism, a liquid-side pipe connecting the exhaust pipe, the outer heat exchanger, the dehumidification throttling adjustment device, and the first heat exchanger in sequence, and a gas-side pipe connecting the first heat exchanger and the low-pressure suction pipe, thereby forming a dehumidification circuit;

[0006] The inner unit further includes a second heat exchanger and a reheating throttling adjustment device;

[0007] The air conditioner further includes a high and low pressure pipe, which sequentially connects the first intersection point of the liquid-side pipe, the reheating throttling adjustment device, the second heat exchanger and the exhaust pipe, thereby forming a reheating circuit, wherein the first intersection point is located between the dehumidification throttling adjustment device and the outer heat exchanger;

[0008] A three-way valve, the three ports of the three-way valve are respectively communicated with the exhaust pipe, the liquid-side pipe and the high and low pressure pipe, so that the exhaust pipe is conducted with the high and low pressure pipe and / or conducted with the liquid-side pipe.

[0009] Optionally, the air conditioner further includes a connecting pipe, one end of the connecting pipe is communicated with the low-pressure suction pipe or the gas-side pipe, and the other end is communicated with the liquid-side pipe between the outer heat exchanger and the dehumidification throttling adjustment device, and a main control valve is arranged on the connecting pipe.

[0010] Optionally, the inner unit further includes:

[0011] A housing having an air inlet side, an air outlet side, and a first air duct and a second air duct connecting the air inlet side and the air outlet side;

[0012] The first heat exchanger is disposed in the first air duct, and the second heat exchanger is disposed in the second air duct;

[0013] The first air duct and the second air duct are connected through a first air passage, one end of the first air passage is connected to the air outlet side of the first heat exchanger, and the other end of the first air passage is connected to the air inlet side of the second heat exchanger; and,

[0014] A first damper is provided corresponding to the first air passage to open or close the first air passage.

[0015] Optionally, the first air duct and the second air duct are arranged adjacent to each other, and the first air passage is opened on a common side wall of the first air duct and the second air duct;

[0016] The first damper is arranged at a position corresponding to the second heat exchanger and is rotatably connected to the common side wall or the second heat exchanger.

[0017] Optionally, a second air door capable of opening and closing the second air duct is disposed in the second air duct, and a position where the first air passage communicates with the second air duct is located between the second air door and the second heat exchanger.

[0018] Optionally, the second damper is rotatably connected to the first heat exchanger, or is rotatably connected to a common side wall corresponding to the first heat exchanger, wherein the common side wall is a common duct side wall of the first air duct and the second air duct.

[0019] Optionally, the first damper has an A1 position for blocking the first air passage, and the second damper has a B2 position for closing the second air duct, so that the first air duct is open and the second air duct is closed.

[0020] Optionally, the first damper has an A1 position for blocking the first air passage, and the second damper has a B3 position for closing the first air duct, so that the first air duct is closed and the second air duct is open.

[0021] Optionally, the first damper has an A2 position for opening the first air passage and closing the first air duct, and the second damper has a B2 position for closing the second air duct, so that the airflow passes through the first heat exchanger and the second heat exchanger in sequence, or passes through the second heat exchanger and the first heat exchanger in sequence.

[0022] Optionally, the first damper has an A1 position for blocking the first air passage, and the second damper has a B1 position for opening the second air duct, so that the first air duct is conductive and the second air duct is conductive.

[0023] Optionally, the first air damper has a position A3 for opening the first air passage and covering the air inlet side or the air outlet side of the second heat exchanger, and the second air damper has a position B3 for covering the air inlet side or the air outlet side of the first heat exchanger to reduce the heat exchange between the heat exchanger and the air flow.

[0024] Optionally, the air conditioner further includes an air outlet device disposed on the air outlet side. The air outlet device has a first air inlet, a second air inlet, and an air outlet. The first air inlet is communicated with the first air duct, and the second air inlet is communicated with the second air duct.

[0025] Optionally, the air conditioner further includes:

[0026] A first air damper assembly disposed corresponding to the first air inlet to adjust the air inlet area of the first air inlet; and / or,

[0027] A second air damper assembly disposed corresponding to the second air inlet to adjust the air inlet area of the second air inlet; and / or,

[0028] The air conditioner further includes a third air damper assembly disposed corresponding to the air outlet to adjust the air outlet area of the air outlet.

[0029] Optionally, the air inlet side has a common air duct communicating the first air duct and the second air duct. A blower is disposed in the common air duct, and the common air duct has an air inlet.

[0030] Optionally, the air conditioner further includes a flash evaporator disposed on the high and low pressure pipes between the outdoor throttle device and the dehumidification throttle regulating device. The refrigerant inlet and one refrigerant outlet of the flash evaporator are respectively communicated with the high and low pressure pipes, and the other refrigerant outlet of the flash evaporator is communicated with the medium pressure suction inlet of the compressor through a return pipe.

[0031] Optionally, the air conditioner further includes an economizer disposed on the high and low pressure pipes between the outdoor throttle device and the dehumidification throttle regulating device. The refrigerant inlet and one refrigerant outlet of the economizer are respectively communicated with the high and low pressure pipes; the other refrigerant inlet of the economizer is communicated with the high and low pressure pipes through a liquid extraction pipe, and the other refrigerant outlet of the economizer is communicated with the medium pressure suction inlet of the compressor through a return pipe.

[0032] Optionally, the air conditioner further includes a conducting pipe, which is arranged in parallel with the economizer or the flash evaporator on the high and low pressure pipes, and a third control valve is arranged on the conducting pipe.

[0033] Optionally, a fourth control valve is arranged between the flash evaporator or the economizer and the second intersection point. The second intersection point is the connection point of the end of the conducting pipe close to the outdoor throttle device and the high and low pressure pipes.

[0034] Optionally, a fifth control valve is provided on the reflux pipe.

[0035] The present invention further provides an air conditioner, which includes an outer unit and an inner unit. The outer unit includes a compression mechanism and an outer heat exchanger, and the inner unit includes a first heat exchanger and a dehumidification throttling adjustment device;

[0036] The air conditioner further includes: a discharge pipe connected to the discharge side of the compression mechanism, a low-pressure suction pipe connected to the low-pressure suction side of the compression mechanism, a liquid-side pipe connecting the discharge pipe, the outer heat exchanger, the dehumidification throttling adjustment device, and the first heat exchanger in sequence, and a gas-side pipe connecting the first heat exchanger and the low-pressure suction pipe, thereby forming a dehumidification circuit;

[0037] The inner unit further includes a second heat exchanger and a reheating throttling adjustment device;

[0038] The air conditioner further includes a high-low pressure pipe, which connects the first intersection point of the liquid-side pipe, the reheating throttling adjustment device, the second heat exchanger, and the discharge pipe in sequence, thereby forming a reheating circuit, wherein the first intersection point is located between the dehumidification throttling adjustment device and the outer heat exchanger;

[0039] A second control valve is provided on the liquid-side pipe, and a first control valve is provided on the high-low pressure pipe, so that the discharge pipe is communicated with the high-low pressure pipe and / or with the liquid-side pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0041] Figure 1 It is a schematic structural diagram of an embodiment of the air duct system of the present invention;

[0042] Figure 2 For Figure 1 a schematic diagram of the positional relationship between the first heat exchanger and the second heat exchanger in the right side view of

[0043] Figure 3 It is a schematic diagram of the principle structure of the refrigerant system of an embodiment of the air conditioner of the present invention;

[0044] Figure 4 It is a schematic diagram of the structure when both the first heat exchanger and the second heat exchanger are refrigerating;

[0045] Figure 5 Schematic diagram of the structure where both the first heat exchanger and the second heat exchanger are heating

[0046] Figure 6 Schematic diagram of the structure where the first heat exchanger is cooling and the second heat exchanger is heating

[0047] Figure 7 Schematic diagram of the structure where the first air damper is at the A1 station, the second air damper is at the B1 station, and both the first heat exchanger and the second heat exchanger are heating

[0048] Figure 8 Schematic diagram of the structure where the first air damper is at the A1 station, the second air damper is at the B1 station, and both the first heat exchanger and the second heat exchanger are cooling

[0049] Figure 9 Schematic diagram of the structure where the first air damper is at the A2 station and the second air damper is at the B2 station

[0050] Figure 10 Schematic diagram of the structure where the first air damper is at the A1 station, the second air damper is at the B1 station, the first heat exchanger is cooling, and the second heat exchanger is heating

[0051] Figure 11 Schematic diagram of the structure where the first air damper is at the A3 station and the second air damper is at the B3 station

[0052] Figure 12 Schematic diagram of the structure where the first air damper is at the A1 station and the second air damper is at the B3 station

[0053] Figure 13 Schematic diagram of the structure of an embodiment of an air damper assembly of the air duct system of the present invention

[0054] Figure 14 Schematic diagram of the structure of another embodiment of an air damper assembly of the air duct system of the present invention

[0055] Figure 15 Schematic diagram of the structure of an embodiment of another air damper assembly of the air duct system of the present invention

[0056] Figure 16 Schematic diagram of the structure of another embodiment of another air damper assembly of the air duct system of the present invention

[0057] Figure 17 Schematic diagram of the structure of the refrigerant system of the air conditioner of the present invention when the first heat exchanger is cooling and the second heat exchanger stops operating

[0058] Figure 18 Schematic diagram of the structure of the refrigerant system of the air conditioner of the present invention when the second heat exchanger is heating and the first heat exchanger stops operating

[0059] Figure 19 It is a schematic structural diagram when the first heat exchanger of the refrigerant system of the air conditioner of the present invention is refrigerating and the second heat exchanger is heating;

[0060] Figure 20 It is a schematic structural diagram of another embodiment of the principle of the refrigerant system of the air conditioner of the present invention;

[0061] Figure 21 It is a schematic structural diagram of still another embodiment of the principle of the refrigerant system of the air conditioner of the present invention;

[0062] Figure 22 It is a schematic structural diagram of still another embodiment of the principle of the refrigerant system of the air conditioner of the present invention;

[0063] Figure 23 It is a schematic structural diagram when the first air door is at the A1 station and the second air door is at the B2 station.

[0064] Explanation of the reference numerals in the drawings:

[0065]

[0066]

[0067] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0068] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0069] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0070] In addition, the descriptions involving "first", "second", etc. in the present invention are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0071] The present invention mainly proposes an air duct system, which is mainly applied to an air conditioner to increase the functions of the air conditioner. By providing a first air duct 510 and a second air duct 520 that are isolated from each other, users in different rooms or different areas can obtain air at different temperatures (cold air and / or hot air) according to their needs, so as to meet the requirements of temperature adjustment; by setting the areas of the first air inlet 710, the second air inlet 720 and the air outlet 730 to be adjustable, the cooling capacity, heating capacity and air volume required for each room can be adjusted; through the setting of the first air damper 410, the second air damper 420 and the first air passage, the air conditioner can efficiently achieve different required modes. The air duct system can be used in an indoor unit, but is not limited to being placed indoors. As long as the air outlets 730 of different air outlet devices 700 lead to different rooms, the temperature adjustment of different rooms can be achieved; of course, in some embodiments, the air outlets 730 of different air outlet devices 700 can also be arranged at different positions in the same room, so as to perform different temperature adjustments on different areas of the same room.

[0072] The following will mainly describe the specific structure of the air duct system.

[0073] Refer to Figures 1 to 3 , in the embodiment of the present invention, the air duct system includes:

[0074] A housing 200, the housing 200 having an air inlet side, an air outlet side, and a first air duct 510 and a second air duct 520 that connect the air inlet side and the air outlet side;

[0075] A first heat exchanger 310 is arranged in the first air duct 510, and a second heat exchanger 320 is arranged in the second air duct 520;

[0076] The first air duct 510 and the second air duct 520 are connected through a first air passage, one end of the first air passage is connected to the air outlet side of the first heat exchanger 310, and the other end is connected to the air inlet side of the second heat exchanger 320;

[0077] A first air damper 410, the first air damper 410 being arranged corresponding to the first air passage to open or close the first air passage.

[0078] Specifically, in this embodiment, the overall shape of the housing 200 can be various, such as cuboid-shaped, columnar, etc. The first air duct 510 and the second air duct 520 are respectively connected to the air inlet side and the air outlet side. Among them, the relative positions of the first air duct 510 and the second air duct 520 can be various, such as being far apart or being adjacent to each other. The first heat exchanger 310 and the second heat exchanger 320 can both refrigerate and heat, that is, the two can heat simultaneously, refrigerate simultaneously, or one refrigerates while the other heats. In this embodiment, taking the parallel arrangement of the first air duct 510 and the second air duct 520 as an example, there is a common air duct side wall between them. The form of the first air passage 530 connecting the first air duct 510 and the second air duct 520 can be various. One end of the first air passage 530 is connected to the air outlet side of the first heat exchanger 310, and the other end is connected to the air inlet side of the second heat exchanger 320. When the first air damper 410 closes the first air passage 530, the first air duct 510 and the second air duct 520 are independent of each other. The air in the first air duct 510 exchanges heat with the first heat exchanger 310 and then flows to the air outlet side, and the air in the second air duct 520 exchanges heat with the second heat exchanger 320 and then flows to the air outlet side.

[0079] After the first air damper 410 opens the first air passage 530, the air in the first air duct 510 can exchange heat with the first heat exchanger 310, then pass through the first air passage 530 and flow into the second air duct 520, and then exchange heat with the second heat exchanger 320 and flow to the air outlet side. When the first heat exchanger 310 refrigerates and the second heat exchanger 320 heats, the air first exchanges heat and dehumidifies through the first heat exchanger 310, and then absorbs heat and returns to the original temperature through the second heat exchanger 320.

[0080] In this embodiment, by connecting the first air duct 510 and the second air duct 520 to the air inlet side and the air outlet side respectively, arranging the first heat exchanger 310 in the first air duct 510, arranging the second heat exchanger 320 in the second air duct 520, and simultaneously arranging the first air passage 530 connecting the air outlet side of the first heat exchanger 310 and the air inlet side of the second heat exchanger 320; when the first air damper 410 is closed, the air passes through the first heat exchanger 310 and the second heat exchanger 320 respectively, and refrigeration or heating can be achieved; when the first air damper 410 is opened, the air can first pass through the first heat exchanger 310 and then through the second heat exchanger 320. When the first heat exchanger 310 refrigerates and the second heat exchanger 320 heats, dehumidification and reheating can be achieved; thus, the air duct system can not only refrigerate and heat, but also achieve dehumidification and reheating, increasing the functions of the air conditioner and meeting the needs of users.

[0081] In some embodiments, to improve the structural compactness and space utilization rate, the first air duct 510 and the second air duct 520 are arranged adjacent to each other, and the first air passage is opened on the common side wall of the first air duct 510 and the second air duct 520. In this embodiment, the first air duct 510 and the second air duct 520 are arranged in parallel and are separated by a partition. The first air passage is opened on the partition, and the first air damper 410 is movably arranged corresponding to the first air passage to open and close the first air passage. In this way, the space inside the housing 200 is fully and reasonably utilized. At the same time, when the first air passage is opened, since the length of the first air passage is very short, the air flow can flow smoothly between the first air duct 510 and the second one.

[0082] In some embodiments, to further improve the space utilization rate and structural compactness, the first air damper 410 is arranged corresponding to the position of the second heat exchanger 320 and is rotatably connected to the common side wall or the second heat exchanger 320. The second heat exchanger 320 is arranged in the second air duct 520 and is adjacent to the first air passage. The second heat exchanger 320 can be connected to the common side wall. When the first air damper 410 is rotatably connected to the second heat exchanger 320, there are many positions where the first air damper 410 can be connected, such as multiple positions in the length direction or width direction of the second heat exchanger 320, as long as the first air passage can be blocked. In some embodiments, to make the utilization rate of the first air damper 410 higher, the first air damper 410 can be rotatably connected to the side of the second heat exchanger 320 close to the second air duct 520 (common side wall), so that the first air damper 410 can selectively block any one of the first air passage, the first air duct 510, and the second air duct 520 (the air inlet side of the second heat exchanger 320). In this way, the rotation of the first air damper 410 can realize the adjustment of the air duct. Similarly, when the first air damper 410 is rotatably arranged on the common side wall, the first air damper 410 is rotatably connected to the side of the first air passage, so that the utilization rate of the first air damper 410 can be greatly improved. Similarly, the first air damper 410 is rotatably connected to the common side wall, so that the first air damper 410 can selectively block any one of the first air passage, the first air duct 510, and the second air duct 520 (the air inlet side or the air outlet side of the second heat exchanger 320).

[0083] In some embodiments, in order to improve the adaptability of air supply, that is, to meet various needs of users, the air duct system further includes an air outlet device 700. The air outlet device 700 is arranged 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 510, and the second air inlet 720 is communicated with the second air duct 520. By respectively arranging the first air inlet 710 and the second air inlet 720 of the air outlet device 700 in the first air duct 510 and the second air duct 520, the air outlet device 700 can simultaneously take air from different air ducts, so that the air flowing out of the air outlet 730 can have the air in the first air duct 510 and the air in the second air duct 520.

[0084] In order to adjust the amount of air taken by the air outlet device 700 from the first air duct and the second air duct 520, the air duct system further includes:

[0085] A first air damper 410 assembly, arranged corresponding to the first air inlet 710 to adjust the air inlet area of the first air inlet 710; and / or,

[0086] A second air damper 420 assembly, arranged corresponding to the second air inlet 720 to adjust the air inlet area of the second air inlet 720.

[0087] In order to adjust the total amount of air outlet of the air outlet device 700, the air duct system further includes a third air damper assembly 800. The third air damper assembly 800 is arranged corresponding to the air outlet 730 to adjust the air outlet area of the air outlet 730.

[0088] The structures and forms of the first air damper 410 assembly, the second air damper 420 assembly, and the third air damper assembly 800 can be the same or different. Several forms of the air damper assembly 800 are introduced below, and the first air damper 410 assembly, the second air damper 420 assembly, and the third air damper assembly 800 can be selectively used.

[0089] The first type of air damper assembly 800, see Figure 13 and 14 , the shape of the air inlet or the air outlet 730 can be circular or square. The air damper assembly 800 can be a baffle 810. The baffle 810 can stay at the position required by the air inlet or the air outlet 730 to adjust the effective air passing area of the air inlet and the air outlet 730.

[0090] The second type of air damper assembly 800, see Figure 15 and 16, the shape of the air inlet or the air outlet 730 is circular or square. Taking the circular setting as an example. The second damper assembly 800 includes a plurality of vanes 820 and a driving structure. The plurality of vanes 820 can be enclosed or spread with the drive of the driving structure. When it is necessary to increase the air outlet or air inlet area, the plurality of vanes 820 are driven to move around at the same time to increase the area enclosed by the plurality of vanes 820, thereby increasing the ventilation area of the air outlet; when it is necessary to reduce the air outlet or air inlet area, the plurality of vanes 820 are driven to move towards the middle, thereby reducing the area enclosed by the plurality of vanes 820 to reduce the ventilation area of the air outlet.

[0091] In order to improve the compactness and reliability of the air duct system structure, the air inlet side has a common air duct connecting the first air duct 510 and the second air duct 520. A fan 600 is arranged in the common air duct, and the common air duct has an air inlet. The common air duct is located on the air inlet side. Through the setting of the air inlet, the air outside the air duct can enter the common air duct through the air inlet, and then enter the first air duct 510 and the second air duct 520 respectively through the common air duct, and heat exchange occurs in the first air duct 510 and the second air duct 520. By arranging the fan 600 in the common air duct, the air flow can be quickly drawn into the common air duct and transported to the first air duct 510 and the second air duct 520. In this way, while the working efficiency of the fan 600 is greatly increased, the air duct space is also fully and reasonably utilized, making the structure of the air duct system compact and stable. In addition, by arranging the fan 600 on the air inlet side, it is also convenient for the operator to maintain, repair and replace the fan 600.

[0092] 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 flow, which will be briefly introduced below.

[0093] When the first heat exchanger 310 and the second heat exchanger 320 are refrigerating, the air exchanges heat with the first heat exchanger 310 and the second heat exchanger 320 respectively and then flows to the air outlet side for refrigeration; when the first heat exchanger 310 and the second heat exchanger 320 are heating, the air exchanges heat with the first heat exchanger 310 and the second heat exchanger 320 respectively and then flows to the air outlet side for heating; when the first heat exchanger 310 is heating (refrigerating) and the second heat exchanger 320 is refrigerating (heating), the proportion of cold air and hot air in the mixed air outlet can be controlled by controlling the first damper 410 assembly and the second damper 420 assembly, so as to control the temperature of the mixed air flowing out of the air outlet 730. When the number of air outlet assemblies is multiple and they are respectively arranged at different positions, the needs of different people and different users can be met.

[0094] In some embodiments, in order to make the structural change of the air duct more flexible to meet the needs of different users, a second air damper 420 capable of opening and closing the second air duct 520 is provided in the second air duct 520. The position where the first air passage communicates with the second air duct 520 is located between the second air damper 420 and the second heat exchanger 320. The second air damper 420 is arranged close to the air inlet side, and the side of the second air damper 420 close to the air inlet side has a second air passage. There may be a shared air duct side wall between the second air damper 420 and the air inlet side, or it may be empty. When there is a shared air duct side wall between them, the second air passage is opened on the shared side wall, and the second air damper 420 can open and close the second air passage; when it is empty between them, that is, when there is no shared side wall between them, the second air passage may be the area that can be blocked by the second air damper 420, that is, when the second air damper 420 extends along the shared side wall of the first air duct 510 and the second air duct 520 towards the air inlet side, the second air damper 420 at this time is the shared side wall to extend the first air duct 510 and the second air duct 520. In this way, the second air damper 420 can block any one of the first air duct 510 (the air inlet side or the air outlet side of the first heat exchanger 310), the second air duct 520, and the second air passage. Thereby making the structural change of the air duct more flexible, cooperating with the position of the first air damper 410 to meet different needs of users.

[0095] Among them, there are various installation methods for the second air damper 420. The second air damper 420 is rotatably connected to the first heat exchanger 310, or rotatably connected to the shared side wall corresponding to the first heat exchanger 310, where the shared side wall is the shared air duct side wall of the first air duct 510 and the second air duct 520. There are various specific connection methods, such as connection by hinges, pivot joints, etc., which will not be elaborated here.

[0096] According to the positions of the first air damper 410 and the second air damper 420, the air duct can be transformed into various forms required for different working conditions. Some of them are selected and described below:

[0097] In the first form, the first air damper 410 has an A1 working position for blocking the first air passage, and the second air damper 420 has a B1 working position for opening the second air duct 520 to isolate the first air duct 510 and the second air duct 520 from each other. At this time, the second air damper 420 blocks the second air passage, making the first air duct 510 and the second air duct 520 isolated from each other. In this way, the airflows in the first air duct 510 and the second air duct 520 do not interfere with each other and operate independently. This working condition can meet various needs of users. For example, it can be used for single cooling and single heating. At this time, the first heat exchanger 310 and / or the second heat exchanger 320 can be selectively turned on according to the situation. It can also be used to meet the personalized needs of users, turning on the first heat exchanger for cooling and the second heat exchanger for heating.

[0098] In the second form, the first air damper 410 has a working position A2 for opening the first air passage and closing the first air duct 510, and the second air damper 420 has a working position B2 for closing the second air duct 520, so that the air flow passes through the first heat exchanger 310 and the second heat exchanger 320 in sequence, or passes through the second heat exchanger 320 and the first heat exchanger 310 in sequence. Taking the case where the first heat exchanger 310 is close to the air inlet side as an example, at this time, in order to make the air flow more smooth, the air flow passes through the first heat exchanger 310 first and then through the second heat exchanger 320. At this time, the first heat exchanger 310 can be set for heating and the second heat exchanger 320 can be set for cooling, and at this time, the air is reheated and dehumidified; or, the first heat exchanger 310 is for cooling and the second heat exchanger 320 is for heating, and at this time, the air is dehumidified and reheated. In this working condition, the temperature and humidity control of the air can be realized, which is beneficial to meeting the needs of users.

[0099] In the third form, the first air damper 410 has a working position A3 for opening the first air passage and covering the air inlet side or the air outlet side of the second heat exchanger 320, and the second air damper 420 has a working position B3 for covering the air inlet side or the air outlet side of the first heat exchanger 310 to reduce the heat exchange between the heat exchanger and the air flow. In this form, there is very little air in the air duct that can exchange heat with the first heat exchanger 310 and the second heat exchanger 320. In this way, the energy generated by the first heat exchanger 310 and the second heat exchanger 320 affects the indoor temperature as little as possible. This form is very suitable for forced defrosting, that is, at this time, both the first heat exchanger 310 and the second heat exchanger 320 can be for cooling, and the outer heat exchanger 141 is for heating. In this way, the outer heat exchanger 141 can defrost quickly.

[0100] In the fourth form, the first air damper 410 has a working position A1 for blocking the first air passage, and the second air damper 420 has a working position B3 for covering the air inlet side or the air outlet side of the first heat exchanger 310. The first heat exchanger 310 is for cooling and the second heat exchanger 320 is for heating. At this time, temperature-controlled defrosting can be carried out. The refrigerating first heat exchanger 310 is blocked to minimize the amount of heat exchange between the air flow and it, and the second heat exchanger 320 is opened to enable the air flow to exchange heat with the heating second heat exchanger 320. In this way, the outer heat exchanger 141 and the second heat exchanger 320 are heating at the same time, which can not only defrost but also ensure that the indoor temperature is controlled within a preset range, which is beneficial to improving the comfort of users. Of course, in this mode, the second heat exchanger can also be turned on alone for the heating mode.

[0101] In the fifth form, the first damper 410 has an A1 position for blocking the first air passage, and the second damper 420 has a B2 position for blocking the second air passage, so that the first air passage is open and the second air passage is closed. At this time, the first heat exchanger 310 is cooling, and the second heat exchanger 320 stops working. The air is formed after passing through the first air passage and the first heat exchanger for heat exchange, and is transported to the air supply area under the action of the fan to cool the area.

[0102] Another air duct system is described below. In this air duct system, the first air duct 510 and the second air duct 520 are independent of each other. The air duct system includes:

[0103] A housing 200, wherein the housing 200 has an air inlet side, an air outlet side, and a first air duct 510 and a second air duct 520 connecting the air inlet side and the air outlet side, wherein the first air duct 510 and the second air duct 520 are independent of each other;

[0104] The first air duct 510 is provided with a first heat exchanger 310, and the second air duct 520 is provided with a second heat exchanger 320;

[0105] The air outlet device 700 is arranged on the air outlet side, and has a first air inlet 710, a second air inlet 720 and an air outlet 730. The first air inlet 710 is connected to the first air duct 510, and the second air inlet 720 is connected to the second air duct 520.

[0106] Specifically, in this embodiment, the housing 200 has two independent air ducts, and each air duct is provided with an independently controllable heat exchanger (the cooling and heating of the two heat exchangers do not interfere with each other). The air outlet device 700 can obtain air from the first air duct 510 and the second air duct 520 as required. When one of the first heat exchanger 310 and the second heat exchanger 320 is heating and the other is cooling (taking the first heat exchanger for cooling and the second heat exchanger 320 for heating 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 intake 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 intake of the second air inlet 720. Therefore, the temperature of the 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. In this way, the air duct system can meet the needs of different users.

[0107] The air duct system also includes:

[0108] The first air damper 410 assembly is provided corresponding to the first air inlet 710 to adjust the air inlet area of the first air inlet 710; and / or, the second air damper 420 assembly is provided corresponding to the second air inlet 720 to adjust the air inlet area of the second air inlet 720. The air duct system further includes a third air damper assembly 800 which is provided corresponding to the air outlet 730 to adjust the air outlet area of the air outlet 730. For the specific structures of the first air damper 410 assembly, the second air damper 420 assembly and the third air damper assembly 800, refer to the above embodiments and will not be elaborated herein.

[0109] The air inlet side has a common air duct connecting the first air duct 510 and the second air duct 520. A blower 600 is provided in the common air duct, and the common air duct has an air inlet.

[0110] A plurality of air outlet devices 700 are respectively connected to the air outlet side of the air duct system, so that each air outlet device 700 can take air from the first air duct 510 and the second air duct 520. The plurality of air outlet devices 700 can supply air to different rooms in different rooms, or can be arranged at different positions in the same room to supply air to different areas.

[0111] The present invention also provides an air conditioner, which includes an outdoor unit and an air duct system. The specific structure of the air duct system refers to the above embodiments. Since this air conditioner adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one herein. Among them, the first heat exchanger 310 of the air duct system cools or heats, and the second heat exchanger 320 of the air duct system cools or heats.

[0112] The following introduces an air conditioner system that can achieve simultaneous heating, simultaneous cooling of the first heat exchanger 310 and the second heat exchanger 320, or one heating and one cooling.

[0113] An air conditioner includes an outer unit and an inner unit. The outer unit includes a compressor 110 structure and an outer heat exchanger 141, and the inner unit includes a first heat exchanger 310 and a dehumidification throttling adjustment device 145;

[0114] The air conditioner further includes: an exhaust pipe 111 connected to the discharge side of the compressor 110 structure, a low-pressure suction pipe 113 connected to the low-pressure suction side of the compressor mechanism 110, a liquid side pipe 140 connecting the exhaust pipe 111, the outer heat exchanger 141, the dehumidification throttling adjustment device 145, and the first heat exchanger 310 in sequence, and a gas side pipe 150 connecting the first heat exchanger 310 and the low-pressure suction pipe 113, thereby forming a dehumidification circuit;

[0115] The inner unit further includes a second heat exchanger 320, a reheating throttling adjustment device 151, and a heat circulation device for sending the heat or cold of the inner unit into the room;

[0116] The air conditioner further includes a high and low pressure pipe 160, which sequentially connects the first intersection point of the liquid side pipe 140, the reheating throttling adjustment device 151, the second heat exchanger 320, and the discharge pipe, thereby forming a reheating circuit. Among them, the first intersection point is located between the dehumidification throttling adjustment device 145 and the outer heat exchanger 141; it can also be said to be located between the outer heat exchanger 141 and the intersection point of the liquid side pipe 140 and the discharge pipe 111.

[0117] A three-way valve, the three ports of which are respectively communicated with the high and low pressure pipe 160, the liquid side pipe, and the discharge pipe, so that the high and low pressure pipe 160 is conducted with the discharge pipe or with the liquid side pipe.

[0118] Among them, the inner unit includes the air duct system mentioned in the above embodiment. The three-way valve can be replaced by two two-way valves (the first control valve 170 and the second control valve 180), that is, a two-way valve is arranged between the high and low pressure pipe 160 and the discharge pipe (the first control valve 170 is arranged on the high and low pressure pipe), and a two-way valve is arranged between the discharge pipe and the liquid side pipe (the second control valve 180 is arranged on the liquid side pipe). In this way, the conduction between the high and low pressure pipe 160 and the discharge pipe is independent of the conduction between the discharge pipe and the liquid side pipe. The discharge pipe can be conducted with only one of them, or the discharge pipe can be conducted with both of them at the same time.

[0119] It should be noted that when the air conditioner is a split air conditioner, the inner unit can be an indoor unit, and the outer unit can be an outdoor unit; in some other embodiments, when the air conditioner is an integrated air conditioner, the inner unit and the outer unit are only used to refer to two sets of units, and are not limited to indoor and outdoor, such as window air conditioners, vehicle-mounted air conditioners, etc.

[0120] In order to implement more forms of the first heat exchanger 310 and the second heat exchanger 320, the air conditioner further includes a connecting pipe, one end of which is communicated with the low-pressure suction pipe or the gas side pipe, and the other end is communicated with the liquid side pipe between the outer heat exchanger and the dehumidification throttling adjustment device, and a main control valve is arranged on the connecting pipe.

[0121] Regarding the working modes of the air conditioner, there are three modes: the first heat exchanger refrigerates alone, the second heat exchanger heats alone, and the first heat exchanger refrigerates and the second heat exchanger heats. Based on this, different working modes can be obtained by cooperating with the positions of the first air damper and the second air damper:

[0122] The first heat exchanger refrigerates alone, and the second heat exchanger stops working:

[0123] The refrigerant under high temperature and high pressure is discharged from the exhaust pipe 111, and successively passes through the three-way valve or the second control valve, the liquid-side pipe 140, and the outdoor heat exchanger 141, and then enters the first heat exchanger for refrigeration. The refrigerant flows out of the first heat exchanger and flows into the gas-liquid separator 120 through the gas-side pipe 150. During this process, the first control valve 170 is closed and the second control valve 180 is opened. The three-way valve 190 conducts the discharge pipe and the liquid-side pipe, and closes the high-low pressure pipe and the liquid-side pipe. At this time, the first air duct can be opened and the second air duct can be closed, so that the air flow flows to the air supply area after being cooled by the first heat exchanger. At this time, the refrigeration mode and the outdoor defrosting mode of the air conditioner can be realized.

[0124] The second heat exchanger heats alone, and the first heat exchanger stops working. Heating mode:

[0125] The refrigerant under high temperature and high pressure is discharged from the exhaust pipe 111, successively passes through the high-low pressure pipe 160 and enters the second heat exchanger for heating, flows out of the second heat exchanger and then enters the liquid-side pipe 140, the outdoor heat exchanger 141, as well as the connecting pipe 114 and the main control valve 131. After flowing into the gas-liquid separator 120, it returns to the compressor through the low-pressure suction pipe 113. During this process, the three-way valve 190 closes the discharge pipe and the liquid-side pipe, and conducts the discharge pipe and the high-low pressure pipe 160; or the first control valve 170 is opened and the second control valve 180 is closed. At the same time, the main control valve 131 is opened, so that the connecting pipe 114 conducts the liquid-side pipe 140 and the low-pressure suction pipe 113. At this time, the second air duct can be opened and the first air duct can be closed, so that the air flow flows to the air supply area after being heated by the second heat exchanger. At this time, the heating mode of the air conditioner can be realized.

[0126] The first heat exchanger refrigerates and the second heat exchanger heats:

[0127] The refrigerant under high temperature and high pressure is discharged from the exhaust pipe 111. A part of it successively passes through the liquid-side pipe 140 and the outdoor heat exchanger, and then enters the first heat exchanger 310 for refrigeration, and then passes through the gas-side pipe 150 and flows into the gas-liquid separator. Another part successively passes through the high-low pressure pipe 160 and enters the second heat exchanger for heating, and then flows into the liquid-side pipe through the high-low pressure pipe, and successively passes through the outer heat exchanger and the first heat exchanger. During this process, the first control valve 170 is opened and the second control valve 180 is also opened. The three-way valve 190 simultaneously conducts the high-low pressure pipe and the discharge pipe, conducts the discharge pipe and the liquid-side pipe, and the main control valve is closed.

[0128] Of course, in some embodiments, the refrigerant may only have the following path, passing through the liquid-side pipe 140, the outdoor heat exchanger in sequence, and then entering the first heat exchanger 310 for refrigeration, and then passing through the gas-side pipe 150 and flowing into the gas-liquid separator. At this time, the first control valve 170 is opened, the second control valve 180 is closed, the main control valve 131 is closed, and the three-way valve 190 only conducts the high- and low-pressure pipes and the discharge pipe.

[0129] Referring to Figures 17 to 19 , in some embodiments, in order to improve the performance of the compressor (such as the heating capacity in a low-temperature environment), the compressor is supplemented with gas, and there are various ways of gas supplementation. The following will be described by taking the setting of the flash evaporator 911 and the setting of the economizer 921 as examples respectively.

[0130] The flash evaporator 911 is arranged on the liquid-side pipe 140, between the outer heat exchanger 141 and the indoor throttling device. The refrigerant inlet and one refrigerant outlet of the flash evaporator 911 are respectively communicated with the liquid-side pipes 140 at both ends, and the other refrigerant outlet is communicated with the medium-pressure return port of the compressor through the return pipe 917. A fifth control valve 916 can be arranged on the return pipe 917 to control its on-off.

[0131] The economizer 921 is arranged on the liquid-side pipe 140, between the outer heat exchanger 141 and the indoor throttling device. One refrigerant inlet and one refrigerant outlet of the economizer 921 are respectively communicated with the liquid-side pipes 140 at both ends, and the other refrigerant outlet is communicated with the medium-pressure return port of the compressor through the return pipe 917. Another refrigerant inlet of the economizer 921 is communicated with the liquid-side pipe 140 through the liquid extraction pipe 923. The liquid extraction can be divided into two cases: upper liquid extraction and lower liquid extraction, which can be set according to actual needs. An economizer throttling device 922 is arranged on the liquid extraction pipe 923, taking the electronic expansion valve as an example.

[0132] In some embodiments, in order to selectively use the flash evaporator 911 and the economizer 921, a conduction pipe 915 is also arranged in parallel with the flash evaporator 911 or the economizer 921. Both ends of the conduction pipe 915 are respectively communicated with the liquid-side pipe 140, and a third control valve 912 is arranged on the conduction pipe 915. In some embodiments, in order 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 arranged between the flash evaporator 911 and the outer heat exchanger 141, or between the economizer 921 and the outer heat exchanger 141.

[0133] When the flash evaporator 911 or the economizer 921 needs to be used, close the third control valve 912 to block the conduction pipe 915, and open the fourth control valve 913 and the fifth control valve 916 so that the refrigerant passes through the flash evaporator 911 or the economizer 921; when the flash evaporator 911 or the economizer 921 does not need to be used, open the third control valve 912, close the fourth control valve 913 and the fifth control valve 916, so that the refrigerant passes through the conduction pipe 915 and does not pass through the economizer 921 and the flash evaporator 911.

[0134] Among them, the first control valve, the second control valve, the third control valve 912, the fourth control valve 913 and the fifth control valve 916 can be solenoid valves.

[0135] For the above air duct system, the present application proposes a control method for the air duct system to meet the air supply requirements of different users. The control method of the air duct system includes:

[0136] Obtain a mode instruction;

[0137] Specifically, in this embodiment, there are various ways to obtain the mode instruction. It can obtain the instruction sent by an external terminal, such as a mobile phone, a remote control, etc.; it can also be obtained from other household electrical appliances, such as an electric fan, an air purifier, etc.; it can also be obtained by detecting its own operating parameters, or detecting external environmental parameters, such as calculating the indoor temperature; of course, it can also be obtained from the cloud.

[0138] The mode instruction can include refrigeration, heating, dehumidification, temperature-controlled dehumidification, defrosting, and non-sensing defrosting, etc.

[0139] Adjust the working states of the first heat exchanger 310 and the second heat exchanger 320 according to the mode instruction; according to different mode instructions, control the compressor 110, the fan 600, the first heat exchanger 310 and the second heat exchanger 320, etc. to work. For example, when heating, the second heat exchanger 320 heats alone; when refrigerating, the first heat exchanger 310 refrigerates alone; when temperature-controlled dehumidifying, the first heat exchanger 310 refrigerates and the second heat exchanger 320 heats, etc.

[0140] Adjust the working positions of the first air damper 410 and the second air damper 420 according to the mode instruction. In different working modes, the first air damper 410 and the second air damper 420 respectively correspond to different positions to meet the requirements of the air duct under different working conditions and modes.

[0141] In this embodiment, by setting the first air damper 410 and the second air damper 420 and making the positions of the first air damper 410 and the second air damper 420 adjustable, different forms of air ducts are realized, so as to meet the requirements of the air duct under different modes. In this way, the adaptability of the air duct system is greatly improved, which is beneficial to meeting the different needs of people.

[0142] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present invention.

Claims

1. An air conditioner, characterized in that, it includes an outer unit and an inner unit, the outer unit includes a compression mechanism and an outer heat exchanger, and the inner unit includes a first heat exchanger and a dehumidification throttling adjustment device; the air conditioner further includes: a discharge pipe connected to the discharge side of the compression mechanism, a low-pressure suction pipe connected to the low-pressure suction side of the compression mechanism, a liquid-side pipe connecting the discharge pipe, the outer heat exchanger, the dehumidification throttling adjustment device, and the first heat exchanger in sequence, and a gas-side pipe connecting the first heat exchanger and the low-pressure suction pipe, thereby forming a dehumidification circuit; the inner unit further includes a second heat exchanger and a reheating throttling adjustment device; the air conditioner further includes a high-low pressure pipe, and the high-low pressure pipe connects the first intersection point of the liquid-side pipe, the reheating throttling adjustment device, the second heat exchanger, and the discharge pipe in sequence, thereby forming a reheating circuit, wherein the first intersection point is located between the dehumidification throttling adjustment device and the outer heat exchanger; a three-way valve, and three ports of the three-way valve are respectively communicated with the discharge pipe, the liquid-side pipe, and the high-low pressure pipe, so that the discharge pipe is communicated with the high-low pressure pipe and / or communicated with the liquid-side pipe; the inner unit further includes: a housing having an air inlet side, an air outlet side, and a first air duct and a second air duct communicating the air inlet side and the air outlet side; the first heat exchanger is arranged in the first air duct, and the second heat exchanger is arranged in the second air duct; the first air duct and the second air duct are communicated through a first air passage, one end of the first air passage is communicated with the air outlet side of the first heat exchanger, and the other end is communicated with the air inlet side of the second heat exchanger; and, a first air damper corresponding to the first air passage is provided to open or close the first air passage; a second air damper capable of opening and closing the second air duct is arranged in the second air duct, and the position where the first air passage communicates with the second air duct is located between the second air damper and the second heat exchanger; the first air damper has an A1 position for blocking the first air passage, and the second air damper has a B3 position for closing the first air duct, so that the first air duct is closed and the second air duct is conducted.

2. The air conditioner according to claim 1, characterized in that, the air conditioner further includes a connecting pipe, one end of the connecting pipe is communicated with the low-pressure suction pipe or the gas-side pipe, and the other end is communicated with the liquid-side pipe between the outer heat exchanger and the dehumidification throttling adjustment device, and a main control valve is arranged on the connecting pipe.

3. The air conditioner according to claim 1, characterized in that, the first air duct and the second air duct are arranged adjacent to each other, and the first air passage is opened on the common side wall of the first air duct and the second air duct; the first air damper is arranged corresponding to the position of the second heat exchanger and is rotatably connected to the common side wall or the second heat exchanger.

4. The air conditioner according to claim 1, characterized in that, the second air damper is rotatably connected to the first heat exchanger or the common side wall corresponding to the first heat exchanger, wherein the common side wall is the common air duct side wall of the first air duct and the second air duct.

5. The air conditioner according to claim 3, It is characterized in that The first air door has an A1 position for blocking the first air passage, and the second air door has a B2 position for closing the second air duct, so that the first air duct is open and the second air duct is closed.

6. The air conditioner according to claim 3, It is characterized in that The first damper has an A2 position for opening the first air passage and closing the first air duct, and the second damper has a B2 position for closing the second air duct, so that the airflow passes through the first heat exchanger and the second heat exchanger in sequence, or passes through the second heat exchanger and the first heat exchanger in sequence.

7. The air conditioner according to claim 3, It is characterized in that The first air door has an A1 position for blocking the first air passage, and the second air door has a B1 position for opening the second air passage, so that the first air passage is conductive and the second air passage is conductive.

8. The air conditioner according to claim 3, It is characterized in that The first damper has an A3 position for opening the first air passage and covering the air inlet side or the air outlet side of the second heat exchanger, and the second damper has a B3 position for covering the air inlet side or the air outlet side of the first heat exchanger to reduce heat exchange between the heat exchanger and the airflow.

9. The air conditioner according to claim 1 or 3, It is characterized in that The air conditioner also includes an air outlet device, which is arranged on the air outlet side. The air outlet device has a first air inlet, a second air inlet and an air outlet. The first air inlet is connected to the first air duct, and the second air inlet is connected to the second air duct.

10. The air conditioner according to claim 9, It is characterized in that The air conditioner also includes: a first damper assembly, arranged corresponding to the first air inlet, to adjust the air inlet area of ​​the first air inlet; and / or, a second damper assembly, arranged corresponding to the second air inlet, to adjust the air inlet area of ​​the second air inlet; and / or, The air conditioner further comprises a third damper assembly, which is arranged corresponding to the air outlet to adjust the air outlet area of ​​the air outlet.

11. The air conditioner according to claim 9, It is characterized in that The air inlet side has a common air duct connecting the first air duct and the second air duct, a fan is arranged in the common air duct, and the common air duct has an air inlet.

12. The air conditioner according to claim 1, It is characterized in that The air conditioner also includes a flash evaporator, which is arranged on the high and low pressure pipes between the outdoor throttling device and the dehumidification throttling adjustment device. The refrigerant inlet and one refrigerant outlet of the flash evaporator are respectively connected to the high and low pressure pipes, and the other refrigerant outlet of the flash evaporator is connected to the medium pressure suction port of the compressor through a return pipe.

13. The air conditioner according to claim 1, It is characterized in that The air conditioner also includes an economizer, which is arranged on the high and low pressure piping between the outdoor throttling device and the dehumidification throttling adjustment device. The refrigerant inlet and one refrigerant outlet of the economizer are respectively connected to the high and low pressure piping; the other refrigerant inlet of the economizer is connected to the high and low pressure piping through a liquid extraction pipe, and the other refrigerant outlet of the economizer is connected to the medium pressure suction port of the compressor through a return pipe.

14. The air conditioner according to claim 12, It is characterized in that The air conditioner further includes a conduction pipe, which is arranged in parallel with the flash evaporator on the high and low pressure pipes, and a third control valve is arranged on the conduction pipe.

15. The air conditioner according to claim 13, characterized in that, the air conditioner further includes a conduction pipe, which is arranged in parallel with the economizer on the high and low pressure pipes, and a third control valve is arranged on the conduction pipe.

16. The air conditioner according to claim 14, characterized in that, a fourth control valve is arranged between the flash evaporator and the second intersection point, and the second intersection point is the connection point of the end of the conduction pipe close to the outdoor throttle device and the high and low pressure pipes.

17. The air conditioner according to claim 15, characterized in that, a fourth control valve is arranged between the economizer and the second intersection point, and the second intersection point is the connection point of the end of the conduction pipe close to the outdoor throttle device and the high and low pressure pipes.

18. The air conditioner according to claim 12 or 13, characterized in that, a fifth control valve is arranged on the return pipe.

19. An air conditioner, characterized in that, it includes an outer unit and an inner unit, the outer unit includes a compression mechanism and an outer heat exchanger, and the inner unit includes a first heat exchanger and a dehumidification throttle adjustment device; the air conditioner further includes: a discharge pipe connected to the discharge side of the compression mechanism, a low-pressure suction pipe connected to the low-pressure suction side of the compression mechanism, a liquid side pipe connecting the discharge pipe, the outer heat exchanger, the dehumidification throttle adjustment device, and the first heat exchanger in sequence, and a gas side pipe connecting the first heat exchanger and the low-pressure suction pipe, thereby forming a dehumidification circuit; the inner unit further includes a second heat exchanger and a reheating throttle adjustment device; the air conditioner further includes high and low pressure pipes, and the high and low pressure pipes connect the first intersection point of the liquid side pipe, the reheating throttle adjustment device, the second heat exchanger, and the discharge pipe in sequence, thereby forming a reheating circuit, wherein the first intersection point is located between the dehumidification throttle adjustment device and the outer heat exchanger; a second control valve is arranged on the liquid side pipe, and a first control valve is arranged on the high and low pressure pipes to make the discharge pipe communicate with the high and low pressure pipes and / or communicate with the liquid side pipe; the inner unit further includes: a housing, which has an air inlet side, an air outlet side, and a first air duct and a second air duct connecting the air inlet side and the air outlet side; the first heat exchanger is arranged in the first air duct, and the second heat exchanger is arranged in the second air duct; the first air duct and the second air duct are communicated through a first air passage, one end of the first air passage is communicated with the air outlet side of the first heat exchanger, and the other end is communicated with the air inlet side of the second heat exchanger; and, a first air damper, which is arranged corresponding to the first air passage to open or close the first air passage; a second air damper capable of opening and closing the second air duct is arranged in the second air duct, and the position where the first air passage communicates with the second air duct is located between the second air damper and the second heat exchanger; The first air damper has a position A1 for blocking the first air passage, and the second air damper has a position B3 for closing the first air duct, so as to close the first air duct and conduct the second air duct.

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