CN219889680U - Air conditioner - Google Patents

Abstract

The utility model discloses an air conditioner, which comprises: a compressor provided with a first outlet and a first inlet; the first heat exchanger is used for exchanging heat with outdoor air and comprises a first heat exchange tube, and the first heat exchange tube is provided with a second inlet and a second outlet which are communicated with the first outlet; a throttle device provided with a third inlet communicated with the second outlet and a third outlet; the gas-liquid separator is provided with a refrigerant inlet, a liquid outlet and a gas outlet which are communicated with the third outlet, and is used for performing gas-liquid separation on the refrigerant input by the refrigerant inlet and outputting liquid refrigerant and gaseous refrigerant from the liquid outlet and the gas outlet respectively; and a second heat exchanger for exchanging heat with indoor air, including a second heat exchange tube and a third heat exchange tube. The technical scheme provided by the utility model aims at solving the technical problem of how to improve the heat exchange efficiency.

Description

Air conditioner

Technical Field

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

Background

The pressure loss is small when the heat exchanger with the conventional pipe diameter is used for heat exchange, and the influence on the heat exchange performance of the heat exchanger is small.

But if the air conditioner uses CO ₂ As a refrigerant, CO ₂ The refrigerating cycle of the refrigerant is a transcritical cycle, the system pressure is very high, the high-pressure side pressure is up to 14Mpa, and the low-pressure side pressure is up to 3-5Mpa. If a heat exchanger with a conventional pipe diameter is used as an evaporator for heat exchange, for example, a heat exchanger with a D5 pipe diameter, serious pressure loss can be caused, and the heat exchange efficiency of the system is low.

Taking a single-cooled integral air conditioner as an example, CO is adopted ₂ The refrigerant is used as working fluid to carry out transcritical cycle refrigeration, the pressure loss is increased, the heat exchange efficiency of the system cannot reach the optimum, and the air conditioner energy efficiency ratio is low.

Disclosure of Invention

The utility model mainly aims to provide an air conditioner, which aims to solve the technical problem of how to improve heat exchange efficiency.

In order to achieve the above object, an air conditioner according to the present utility model includes:

a compressor provided with a first outlet and a first inlet;

the first heat exchanger is used for exchanging heat with outdoor air and comprises a first heat exchange tube, and the first heat exchange tube is provided with a second inlet and a second outlet which are communicated with the first outlet;

a throttle device provided with a third inlet communicated with the second outlet and a third outlet;

the gas-liquid separator is provided with a refrigerant inlet, a liquid outlet and a gas outlet which are communicated with the third outlet, and is used for performing gas-liquid separation on the refrigerant input by the refrigerant inlet and outputting liquid refrigerant and gaseous refrigerant from the liquid outlet and the gas outlet respectively; and

the second heat exchanger is used for exchanging heat with indoor air and comprises a second heat exchange tube and a third heat exchange tube;

the second heat exchange tube is provided with a fourth inlet communicated with the liquid outlet and a fourth outlet communicated with the first inlet, and the third heat exchange tube is provided with a fifth inlet communicated with the gas outlet and a fifth outlet communicated with the first inlet.

In an exemplary embodiment, the second heat exchange tube has an inner diameter that is smaller than an inner diameter of the third heat exchange tube.

In an exemplary embodiment, the second heat exchange tube has an inner diameter of 4.5 to 6.4mm and the third heat exchange tube has an inner diameter of 6.5 to 7.5mm.

In an exemplary embodiment, the second heat exchange tube has a length greater than a length of the third heat exchange tube.

In an exemplary embodiment, the air conditioner further includes:

the shell is internally provided with a first air duct; and

the first fan is arranged in the first air duct and used for driving air to flow along the first air duct;

the second heat exchanger is arranged in the first air duct, and the second heat exchange tubes and the third heat exchange tubes are sequentially arranged in the wind direction of indoor air.

In an exemplary embodiment, a first air inlet communicated with the first air duct is formed in the wall surface of the shell;

the second heat exchange tube is arranged on one side facing the first air inlet, and the third heat exchange tube is arranged on one side, facing away from the first air inlet, of the second heat exchange tube.

In one illustrative embodiment, the refrigerant is carbon dioxide.

In an exemplary embodiment, the air conditioner further includes a third heat exchanger;

the third heat exchanger comprises a first heat exchange flow channel and a second heat exchange flow channel which can exchange heat with the first heat exchange flow channel;

the second outlet is communicated with the third inlet through the first heat exchange flow channel, and the fourth outlet and the fifth outlet are both communicated with the first inlet through the second heat exchange flow channel.

In an exemplary embodiment, the third heat exchanger is a regenerator.

In one exemplary embodiment, the air conditioner is a unitary air conditioner.

In the refrigeration mode, the compressor pressurizes the refrigerant and then conveys the refrigerant to the first heat exchanger, the refrigerant transfers heat to outdoor air to cool when passing through the first heat exchanger, the refrigerant is conveyed to the throttling device again, the static pressure of the refrigerant is reduced when the refrigerant flows through the throttling device, and a part of the refrigerant is gasified, so that the refrigerant is in a gas-liquid mixed state. The refrigerant in the gas-liquid mixing state is conveyed to the gas-liquid separator for gas-liquid separation, the gas-liquid separator conveys the separated liquid refrigerant to the second heat exchange tube of the second heat exchanger, the separated gaseous refrigerant is conveyed to the third heat exchange tube of the second heat exchanger, and the refrigerant absorbs heat of indoor air when flowing through the second heat exchange tube and the third heat exchange tube, so that the indoor air is cooled, and the refrigerant output from the second heat exchange tube and the third heat exchange tube can flow back to the compressor again for compression.

In the process, the refrigerant in the gas-liquid mixing state is separated into a liquid refrigerant and a gaseous refrigerant by the gas-liquid separator, and then the liquid refrigerant and the gaseous refrigerant are respectively conveyed into the second heat exchange tube and the third heat exchange tube to exchange heat with indoor air, so that the pressure loss of the refrigerant when flowing through the second heat exchanger can be greatly reduced, the heat exchange efficiency of the whole system is improved, and the energy efficiency ratio of the air conditioner is further improved.

Drawings

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

Fig. 1 is a schematic cross-sectional view of an air conditioner according to an embodiment of the present utility model;

fig. 2 is a schematic diagram illustrating connection of internal pipelines of an air conditioner according to an embodiment of the present utility model.

Reference numerals illustrate:

100. an air conditioner; 1. a compressor; 11. a first inlet; 12. a first outlet; 2. a first heat exchanger; 21. a first heat exchange tube; 211. a second inlet; 212. a second outlet; 3. a throttle device; 31. a third inlet; 32. a third outlet; 4. a gas-liquid separator; 41. a refrigerant inlet; 42. a liquid outlet; 43. a gas outlet; 5. a second heat exchanger; 51. a second heat exchange tube; 511. a fourth inlet; 512. a fourth outlet; 52. a third heat exchange tube; 521. a fifth inlet; 522. a fifth outlet; 6. a third heat exchanger; 61. a first heat exchange flow passage; 62. a second heat exchange flow passage; 7. a first fan; 8. a second fan; 10. a housing; 101. a first air duct; 102. a second air duct; 103. a first air inlet; 104. a first air outlet; 105. a second air inlet; 106. a second air outlet; 107. a partition board.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

As shown in fig. 1 and 2, fig. 1 and 2 show a structure of an air conditioner 100 in the present embodiment. The air conditioner 100 may be a unitary air conditioner 100. The air conditioner 100 includes a housing 10, a compressor 1, a first heat exchanger 2, a throttling device 3, a gas-liquid separator 4, a second heat exchanger 5, a first fan 7, and a second fan 8.

The housing 10 of the air conditioner 100 may be configured as a rectangular housing. The wall surface of the shell 10 is provided with a first air inlet 103, a first air outlet 104, a second air inlet 105 and a second air outlet 106. The first air inlet 103 and the first air outlet 104 may be disposed at one side of the housing 10, and the second air inlet 105 and the second air outlet 106 may be disposed at the other side of the housing 10. A first air duct 101 and a second air duct 102 are provided in the housing 10. The first air duct 101 extends from a first air inlet 103 to a first air outlet 104. The second air duct 102 extends from a second air inlet 105 to a second air outlet 106. The first air duct 101 and the second air duct 102 may be partitioned by a partition 107 provided in the housing 10, and the first air duct 101 and the second air duct 102 are not connected to each other.

In the installed state of the air conditioner 100, the first air inlet 103 is connected to an indoor space inside the building or to an outdoor space outside the building, the first air outlet 104 is connected to an indoor space inside the building, the second air inlet 105 is connected to an indoor space inside the building or to an outdoor space outside the building, and the second air outlet 106 is connected to an outdoor space outside the building.

The first fan 7 may be a centrifugal fan, a cross-flow fan or an axial flow fan. The first fan 7 is arranged in the first air duct 101, the first fan 7 can drive air flow in the first air duct 101 to flow along the first air duct 101, and the air direction in the first air duct 101 flows from the first air inlet 103 to the first air outlet 104. When the first fan 7 operates, indoor air in the inner chamber space is sucked into the first air duct 101 from the first air inlet 103 and then conveyed to the indoor space through the first air outlet 104.

The second fan 8 may be a centrifugal fan, a cross-flow fan or an axial flow fan. The second fan 8 is disposed in the second air duct 102, and the second fan 8 can drive the airflow in the second air duct 102 to flow along the second air duct 102, and the airflow in the second air duct 102 flows from the second air inlet 105 to the second air outlet 106. When the second fan 8 is operated, outdoor air in the outdoor space is sucked into the second air duct 102 from the second air inlet 105 and then is conveyed into the outdoor room through the second air outlet 106.

As shown in fig. 2, the compressor 1 is provided with a first inlet 11 and a first outlet 12. The compressor 1 can suck the refrigerant from the first inlet 11 during operation, pressurize the refrigerant, and output the refrigerant from the first outlet 12. Since the refrigerant is compressed by the compressor 1, the temperature of the refrigerant is high when the refrigerant is output from the first outlet 12 of the compressor 1.

The refrigerant is preferably carbon dioxide. Carbon dioxide is one of the main components of air, has no damage to the atmospheric ozone layer, has wide sources and low price, can greatly reduce the cost of refrigerant substitution, saves energy, solves the problem of pollution of the conventional refrigerant to the environment, and has good economical efficiency. Carbon dioxide is used as a refrigerant, is safe, nontoxic, nonflammable and non-explosive, has good thermal stability, can not decompose harmful gas even at high temperature, and has no harm to human body and ecology due to carbon dioxide leakage. Carbon dioxide has thermal physical properties suitable for refrigeration cycle and equipment, has small molecular weight and large refrigeration capacity, and the refrigeration capacity of a carbon dioxide refrigerant is 5-8 times higher than that of a conventional refrigerant, so that the size and weight of the compressor 1 can be obviously reduced for a refrigeration system with the same refrigeration load, and the whole air conditioner 100 is very compact; the lubrication condition is easy to meet, the common materials of the refrigeration system are not corroded, the sealing performance of the open-type compressor 1 can be improved, and leakage is reduced. The viscosity of carbon dioxide is small, the flow resistance of fluid is small, the heat transfer performance is good, and the heat dissipation of the totally-enclosed compressor 1 can be improved.

The first heat exchanger 2 may be a fin heat exchanger. The first heat exchanger 2 includes a first heat exchange tube 21 and a plurality of first fins. The plurality of first fins are arranged side by side, two adjacent first fins are arranged at intervals, and the first fins are connected to the first heat exchange tube 21. The first heat exchange tube 21 is one or a plurality of in parallel. The first heat exchange tube 21 is provided with a second inlet 211 and a second outlet 212. The second inlet 211 and the second outlet 212 are respectively located at opposite ends of the first heat exchange tube 21. In the cooling mode of the air conditioner 100, the second inlet 211 of the first heat exchange tube 21 is connected to the first outlet 12 of the compressor 1, the compressor 1 sends high-temperature and high-pressure refrigerant to the first heat exchange tube 21 through the second inlet 211, and the refrigerant flows through the first heat exchange tube 21 and is output from the second outlet 212. The first heat exchanger 2 is disposed in the second air duct 102, and when the outdoor air in the second air duct 102 flows through the first heat exchanger 2, the outdoor air exchanges heat with the refrigerant flowing through the first heat exchange tube 21, and the outdoor air takes away a part of heat of the refrigerant, so that the refrigerant is cooled and liquefied in the first heat exchange tube 21.

The throttle device 3 may be a throttle valve or a capillary tube. The throttle device 3 is provided with a third inlet 31, a third outlet 32 and a throttle passage (not shown in the figure). The throttle passage is connected at both ends to the third inlet 31 and the third outlet 32, respectively. The throttling channel is provided with a throttling part with a contracted inner diameter, and the inner diameter of the throttling part is smaller than the inner diameter of other parts of the throttling channel. The third inlet 31 of the throttling means 3 communicates with the second outlet 212 of the first heat exchange tube 21. The high-pressure refrigerant outputted from the first heat exchange tube 21 enters the throttle device 3 through the third inlet 31, flows through the throttle passage, and then is outputted from the third outlet 32 to the throttle device 3. When the refrigerant flows through the throttling part of the throttling channel, the flow rate of the refrigerant is increased and the static pressure is reduced due to the narrowing of the flow channel, part of the liquid refrigerant is gasified into the gaseous refrigerant, and the refrigerant output by the third outlet 32 of the throttling device 3 is the refrigerant in a gas-liquid mixed state.

The gas-liquid separator 4 is used for separating the refrigerant into gas and liquid. The gas-liquid separator 4 may be a gravity sedimentation type gas-liquid separator, a baffle separation type gas-liquid separator, a centrifugal separation type gas-liquid separator, a wire mesh separation type gas-liquid separator, a microporous filtration separation type gas-liquid separator or a filler separation type gas-liquid separator. The gas-liquid separator 4 is provided with a refrigerant inlet 41, a liquid outlet 42, and a gas outlet 43. The refrigerant inlet 41 of the gas-liquid separator 4 is connected to the third outlet 32 of the throttle device 3, and the throttle device 3 injects the refrigerant in a gas-liquid mixture state into the gas-liquid separator 4 through the refrigerant inlet 41. The gas-liquid separator 4 performs gas-liquid separation of the refrigerant in a gas-liquid mixture state, and then outputs a gaseous refrigerant from the gas outlet 43 and a liquid refrigerant from the liquid outlet 42.

The second heat exchanger 5 may be a fin heat exchanger. The second heat exchanger 5 includes a second heat exchange tube 51, a third heat exchange tube 52, and a plurality of second fins. The plurality of second fins are arranged side by side, and two adjacent second fins are arranged at intervals, and the second fins are connected to the second heat exchange tube 51 and/or the third heat exchange tube 52. The second heat exchange tube 51 and the third heat exchange tube 52 are each one or a plurality of in parallel. The second heat exchange tube 51 is provided with a fourth inlet 511 and a fourth outlet 512. The fourth inlet 511 and the fourth outlet 512 are provided at opposite ends of the second heat exchange tube 51, respectively. The third heat exchange tube 52 is provided with a fifth inlet 521 and a fifth outlet 522. The fifth inlet 521 and the fifth outlet 522 are provided at opposite ends of the third heat exchange tube 52, respectively.

In the cooling mode of the air conditioner 100, the fourth inlet 511 of the second heat exchanging pipe 51 is connected to the liquid outlet 42 of the gas-liquid separator 4, and the fourth outlet 512 of the second heat exchanging pipe 51 is connected to the first inlet 11 of the compressor 1. The fifth inlet 521 of the third heat exchange pipe 52 communicates with the gas outlet 43 of the gas-liquid separator 4, and the fifth outlet 522 of the third heat exchange pipe 52 communicates with the first inlet 11 of the compressor 1. The second heat exchanger 5 is disposed in the first air duct 101. When the indoor air in the first air duct 101 flows through the second heat exchanger 5, the refrigerants flowing through the second heat exchange tube 51 and the third heat exchange tube 52 exchange heat with the indoor air, the indoor air absorbs the cold energy of the refrigerants and is cooled, the cooled indoor air is conveyed to the indoor space again, the liquid refrigerant in the second heat exchange tube 51 absorbs the heat of the indoor air and is gasified, the gaseous refrigerant in the third heat exchange tube 52 absorbs the heat of the indoor air and is heated, and the refrigerants of the second heat exchange tube 51 and the third heat exchange tube 52 flow back into the compressor 1 again after absorbing the heat for the next refrigeration cycle.

In this way, in the cooling mode, the compressor 1 pressurizes the refrigerant and then delivers the refrigerant to the first heat exchanger 2, the refrigerant transfers heat to the outdoor air to cool when passing through the first heat exchanger 2, the refrigerant is delivered to the throttling device 3 again, and the static pressure of the refrigerant is reduced and a part of the refrigerant is gasified when flowing through the throttling device 3, so that the refrigerant is in a gas-liquid mixed state. The refrigerant in the gas-liquid mixture state is transferred to the gas-liquid separator 4 for gas-liquid separation, the gas-liquid separator 4 transfers the separated liquid refrigerant to the second heat exchange tube 51 of the second heat exchanger 5, the separated gaseous refrigerant is transferred to the third heat exchange tube 52 of the second heat exchanger 5, and the refrigerant absorbs heat of the indoor air when flowing through the second heat exchange tube 51 and the third heat exchange tube 52, thereby cooling the indoor air, and the refrigerant outputted from the second heat exchange tube 51 and the third heat exchange tube 52 can be re-flowed back to the compressor 1 to be compressed again.

In the process, the refrigerant in the gas-liquid mixing state is separated into the liquid refrigerant and the gaseous refrigerant by the gas-liquid separator 4, and then the liquid refrigerant and the gaseous refrigerant are respectively conveyed into the second heat exchange tube 51 and the third heat exchange tube 52 to exchange heat with indoor air, so that the pressure loss of the refrigerant when flowing through the second heat exchanger 5 can be greatly reduced, the heat exchange efficiency of the whole system is improved, and the energy efficiency ratio of the air conditioner is further improved.

In an exemplary embodiment, the inner diameter of the second heat exchange tube 51 of the second heat exchanger 5 is smaller than the inner diameter of the third heat exchange tube 52 of the second heat exchanger 5. The value of the inner diameter of the second heat exchange tube 51 is in the range of 4.5 to 6.4mm, and the inner diameter of the second heat exchange tube 51 is preferably 4.5 to 5mm. The value of the inner diameter of the third heat exchange tube 52 is in the range of 6.5 to 7.5mm, and the inner diameter of the third heat exchange tube 52 is preferably 6.5 to 7mm.

After the refrigerant is separated into liquid refrigerant and gaseous refrigerant by the gas-liquid separator 4, the volume of the liquid refrigerant is larger than that of the gaseous refrigerant, the pressure loss of the liquid refrigerant is small, the pressure loss of the gaseous refrigerant is large, the liquid refrigerant with small volume is input into the second heat exchange tube 51 with small inner diameter, the gaseous refrigerant with large volume is conveyed to the third heat exchange tube 52 with large inner diameter, the integral pressure loss of the refrigerant when flowing through the second heat exchanger 5 can be further reduced, and the heat exchange efficiency and the air-conditioning energy efficiency ratio of the system are further improved.

In an exemplary embodiment, the length of the second heat exchange tube 51 of the second heat exchanger 5 is greater than the length of the third heat exchange tube 52. When the number of the second heat exchange tubes 51 and/or the third heat exchange tubes 52 is plural, the length of the single second heat exchange tube 51 is longer than the length of the single third heat exchange tube 52.

CO ₂ Before entering the gas-liquid separator 4, the dryness of the refrigerant is 0.3-0.4, which is far higher than that of the conventional refrigerant. After the refrigerant is subjected to gas-liquid separation, the quality of the obtained gaseous refrigerant is smaller than that of the liquid refrigerant, and the liquid refrigerant with larger quality can fully exchange heat with indoor air in the second heat exchange tube 51 with longer length, so that the heat exchange efficiency of the second heat exchanger 5 can be further improved, and the energy efficiency ratio of the air conditioner is increased.

In an exemplary embodiment, the second heat exchange tube 51 and the third heat exchange tube 52 are disposed in the first air duct 101 and are sequentially arranged along the wind direction of the first air duct 101. The second heat exchange tube 51 and the third heat exchange tube 52 may be connected into an integrated structure by the second fin, a gap may be provided between the second heat exchange tube 51 and the third heat exchange tube 52, or the second heat exchange tube 51 and the third heat exchange tube 52 may be separately provided. The second heat exchange tube 51 is disposed on the windward side of the second heat exchanger 5, and the third heat exchange tube 52 is disposed on the leeward side of the second heat exchanger 5. The second heat exchange tube 51 is disposed at a side of the first air inlet 103, and the third heat exchange tube 52 is disposed at a side of the second heat exchange tube 51 facing away from the first air inlet 103.

The cooling effect of the liquid refrigerant in the second heat exchange tube 51 on the indoor air is better than that of the gaseous refrigerant in the third heat exchange tube 52, the indoor air exchanges heat with the liquid refrigerant in the second heat exchange tube 51 and then exchanges heat with the gaseous refrigerant in the third heat exchange tube 52 when flowing in the first air duct 101, the overheat degree of the gaseous refrigerant is reduced, large counter-current heat exchange is realized, the heat exchange efficiency is higher, and the heat exchange effect can be remarkably improved.

In an exemplary embodiment, the air conditioner 100 further includes a third heat exchanger 6. The third heat exchanger 6 is preferably a regenerator. The third heat exchanger 6 includes a first heat exchange flow passage 61 and a second heat exchange flow passage 62. A heat conduction wall surface is arranged between the first heat exchange flow channel 61 and the second heat exchange flow channel 62 at intervals. The heat transfer wall surface separates the first heat exchange flow passage 61 and the second heat exchange flow passage 62 from each other. The heat-conducting wall surface may be made of a material with good heat-conducting property, such as a metal material. The fluid in the first heat exchange flow channel 61 and the fluid in the second heat exchange flow channel 62 can transfer heat through the heat conducting wall surface to realize heat exchange. The heat transfer wall surfaces may be wall surfaces of the flow channels, the first heat transfer flow channel 61 and the second heat transfer flow channel 62 may share the same heat transfer wall surface, or may be provided with heat transfer wall surfaces, respectively, and a heat transfer material is provided between the heat transfer wall surfaces of the first heat transfer flow channel 61 and the second heat transfer flow channel 62.

Both ends of the first heat exchange flow passage 61 are respectively communicated with the second outlet 212 of the first heat exchange tube 21 and the third inlet 31 of the throttle device 3. One end of the second heat exchanging flow path 62 is connected to the fourth inlet 511 of the second heat exchanging pipe 51 and the fifth inlet 521 of the third heat exchanging pipe 52, and the other end of the second heat exchanging flow path 62 is connected to the first inlet 11 of the compressor 1.

In this way, the high-temperature liquid refrigerant output by the first heat exchanger 2 flows through the first heat exchange flow channel 61 of the third heat exchanger 6 and then is conveyed to the throttling device 3, the low-temperature gaseous refrigerant output by the second heat exchanger 5 flows through the second heat exchange flow channel 62 of the third heat exchanger 6 and then flows back to the compressor 1, the low-temperature gaseous refrigerant in the second heat exchange flow channel 62 absorbs heat of the high-temperature liquid refrigerant in the first heat exchange flow channel 61, the temperature of the liquid refrigerant conveyed to the throttling device 3 is further reduced, the temperature of the refrigerant flowing through the second heat exchanger 5 is further reduced, the heat exchange efficiency between the second heat exchanger 5 and indoor air is higher, and the heat exchange effect is remarkably improved.

The refrigeration cycle system in the embodiment shown in fig. 2 can be used for a split type air conditioner in addition to the integrated air conditioner 100 shown in fig. 1, the first air duct 101 of the split type air conditioner can be arranged in an indoor housing in a building, and the second heat exchanger 5 and the first fan 7 can be arranged in the first air duct 101; the second air duct 102 of the split air conditioner may be disposed in an outdoor housing outside the building, and the second air duct 102 may be provided therein with a compressor 1, a first heat exchanger 2, a second fan 8, and the like. A refrigerant pipeline is arranged between the indoor unit and the outdoor unit and is connected with the compressor 1, the first heat exchanger 2, the throttling device 3 and the second heat exchanger 5 to form a refrigeration cycle loop.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the specification and drawings of the present utility model or direct/indirect application in other related technical fields are included in the scope of the present utility model.

Claims (10)

1. An air conditioner, comprising:

a compressor provided with a first outlet and a first inlet;

the first heat exchanger is used for exchanging heat with air and comprises a first heat exchange tube, and the first heat exchange tube is provided with a second inlet and a second outlet which are communicated with the first outlet;

a throttle device provided with a third inlet communicated with the second outlet and a third outlet;

the gas-liquid separator is provided with a refrigerant inlet, a liquid outlet and a gas outlet which are communicated with the third outlet, and is used for performing gas-liquid separation on the refrigerant input by the refrigerant inlet and outputting liquid refrigerant and gaseous refrigerant from the liquid outlet and the gas outlet respectively; and

the second heat exchanger is used for exchanging heat with air and comprises a second heat exchange tube and a third heat exchange tube;

the second heat exchange tube is provided with a fourth inlet communicated with the liquid outlet and a fourth outlet communicated with the first inlet, and the third heat exchange tube is provided with a fifth inlet communicated with the gas outlet and a fifth outlet communicated with the first inlet.

2. The air conditioner of claim 1, wherein an inner diameter of the second heat exchange tube is smaller than an inner diameter of the third heat exchange tube.

3. An air conditioner according to claim 2 wherein the second heat exchange tube has an inner diameter of 4.5 to 6.4mm and the third heat exchange tube has an inner diameter of 6.5 to 7.5mm.

4. An air conditioner according to claim 1 wherein the length of the second heat exchange tube is greater than the length of the third heat exchange tube.

5. The air conditioner of claim 1, further comprising:

the shell is internally provided with a first air duct; and

the first fan is arranged in the first air duct and used for driving air to flow along the first air duct;

the second heat exchanger is arranged in the first air duct, and the second heat exchange tubes and the third heat exchange tubes are sequentially arranged in the air direction of the air.

6. The air conditioner of claim 5, wherein a first air inlet communicated with the first air duct is formed in a wall surface of the housing;

the second heat exchange tube is arranged on one side facing the first air inlet, and the third heat exchange tube is arranged on one side, facing away from the first air inlet, of the second heat exchange tube.

7. The air conditioner of claim 6, wherein a second air duct is further provided in the housing, the first heat exchanger being provided in the second air duct;

the air conditioner further comprises a second fan arranged in the second air duct and used for driving air to flow along the second air duct.

8. The air conditioner according to any one of claims 1 to 7, wherein the refrigerant is carbon dioxide.

9. The air conditioner according to any one of claims 1 to 7, further comprising a third heat exchanger;

the third heat exchanger comprises a first heat exchange flow channel and a second heat exchange flow channel which can exchange heat with the first heat exchange flow channel;

the second outlet is communicated with the third inlet through the first heat exchange flow channel, and the fourth outlet and the fifth outlet are both communicated with the first inlet through the second heat exchange flow channel.

10. The air conditioner of claim 9, wherein the third heat exchanger is a regenerator.