CN213089945U

CN213089945U - Air conditioner

Info

Publication number: CN213089945U
Application number: CN202021945251.4U
Authority: CN
Inventors: 董辰; 夏兴祥; 张恒
Original assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Current assignee: Qingdao Hisense Hitachi Air Conditioning System Co Ltd
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2021-04-30
Anticipated expiration: 2030-09-08

Abstract

The utility model discloses an air conditioning device, including the refrigerant return circuit, hold/release heat return circuit and defrosting branch road, hold/release heat return circuit and have the heat accumulation heat exchanger. When the air conditioner performs heating and heat storage operation, part of the refrigerant flowing out of the compressor passes through the heat storage/release loop to enable the heat storage heat exchanger to store heat, and then the refrigerant is converged with the refrigerant flowing out of the indoor heat exchanger and flows to the outdoor heat exchanger. When the air conditioner performs heating and defrosting, a part of the refrigerant flowing out of the compressor directly flows into the outdoor heat exchanger through the defrosting branch, defrosting is performed by utilizing latent heat of the refrigerant, and then the refrigerant is converged with the refrigerant flowing out of the indoor heat exchanger and flows to the heat accumulation/release loop together to absorb heat stored in the heat accumulation heat exchanger, and then the refrigerant flows to the compressor. The air conditioner can store heat or defrost while heating indoors, does not influence indoor heating capacity during defrosting, and avoids causing indoor temperature fluctuation during defrosting.

Description

Air conditioner

Technical Field

The utility model relates to an air conditioning equipment technical field especially relates to an air conditioning equipment with heat accumulation device.

Background

When the air source heat pump is used for heating in winter, the outdoor heat exchanger plays a role of an evaporator, and when the surface temperature of the heat exchanger is lower than the dew point temperature of humid air and lower than 0 ℃, water can be accumulated on the surface of the outdoor heat exchanger in the form of ice crystals to form a frost layer. The frost layer increases heat conduction resistance and reduces air flow passing through the heat exchanger, so that the heat transfer coefficient of the heat exchanger is reduced, and the heating capacity is reduced. Along with the thickening of the frost layer, the phenomena of fan performance attenuation and evaporation temperature reduction occur, and shutdown occurs in severe cases. Therefore, a defrosting method is required to solve these problems.

The defrosting method comprises wind energy defrosting, reverse defrosting and hot gas bypass defrosting, but has certain defects and limitations. The wind energy defrosting requires a working condition of higher outdoor environment temperature, has great limitation in application and has the problem of defrosting reliability; the reverse defrosting can enable the indoor end of the air conditioner to be a low-pressure side, and even if the fan is turned off, the refrigerant can still absorb heat from the indoor space through natural convection and radiation, so that the temperature is reduced, and the comfortable experience of a user is influenced; the hot gas bypass defrosting speed is low, the defrosting reliability is poor, the defrosting device is only suitable for occasions with low frost quantity, and because the heat quantity is low during defrosting, the indoor unit cannot output air, and the indoor temperature still fluctuates.

The above information disclosed in this background section is only for enhancement of understanding of the background of the application and therefore it may comprise prior art that does not constitute known to a person of ordinary skill in the art.

Disclosure of Invention

To the problem pointed out in the background art, the utility model provides an air conditioning device, it has hold/release heat return circuit and steam bypass defrosting branch road, can carry out heat accumulation or defrosting when realizing indoor heating, does not influence indoor heating ability during the defrosting, causes the indoor temperature fluctuation when avoiding defrosting, improves air conditioning device's use comfort.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme to realize:

in some embodiments of the present application, there is provided an air conditioning apparatus including:

a refrigerant circuit having a compressor, an outdoor heat exchanger, and an indoor heat exchanger, the refrigerant circuit being capable of performing a cooling operation and a heating operation of the air conditioning device;

the air conditioner also has a heating and heat storage simultaneous operation mode, when the air conditioner performs heating and heat storage simultaneous operation, one path of refrigerant flowing out of the compressor realizes a heating function through the indoor heat exchanger, and the other path of refrigerant flows through the heat storage/heat release loop so that the heat storage heat exchanger performs heat storage and then flows to the outdoor heat exchanger after being converged with the refrigerant flowing out of the indoor heat exchanger;

the defrosting branch circuit is connected with the outdoor heat exchanger through the defrosting branch circuit, the defrosting branch circuit is connected with the compressor through the defrosting branch circuit, the defrosting branch circuit is connected with the outdoor heat exchanger through the defrosting branch circuit, and the defrosting branch circuit is connected with the compressor through the defrosting branch circuit.

In some embodiments of the present application, one end of the defrosting branch is connected to the outlet end pipeline of the compressor, the other end of the defrosting branch is connected to the outdoor heat exchanger, a fourth control valve is arranged on the defrosting branch, and the fourth control valve is used for controlling circulation of refrigerant on the defrosting branch.

In some embodiments of the present application, the fourth control valve is a solenoid valve or an electronic expansion valve.

In some embodiments of the present application, an electronic expansion valve is disposed on the heat storage/release loop, and when the air conditioning apparatus performs heating and heat storage simultaneously, the degree of supercooling of the refrigerant at the outlet of the heat storage heat exchanger is adjusted by controlling the opening degree of the electronic expansion valve.

In some embodiments of the present application, a fifth control valve is further disposed on the heat accumulation/release circuit, and the fifth control valve is configured to allow or block the refrigerant flowing out of the compressor to directly flow into the heat accumulation/release circuit;

and a pressure sensor is arranged on an exhaust pipeline of the compressor.

In some embodiments of the present application, the heat accumulation/release circuit has a first branch, a second branch, and a fourth branch;

a fifth control valve is arranged on the first branch, one end of the first branch is connected with an outlet end pipeline of the compressor, and the other end of the first branch is connected with the fourth branch;

one end of the second branch is connected with an outlet of the heat storage heat exchanger during heat storage, the other end of the second branch is connected with a pipeline between the indoor heat exchanger and the outdoor heat exchanger, and an electronic expansion valve is arranged on the second branch;

one end of the fourth branch is connected with a pipeline between the outdoor heat exchanger and the compressor, the other end of the fourth branch is connected with an inlet end pipeline when the heat storage heat exchanger stores heat, and a second control valve is arranged on the fourth branch;

and a third branch is arranged between the fourth branch and the outdoor heat exchanger, the third branch is simultaneously connected with the defrosting branch, and a third control valve is arranged on the third branch.

In some embodiments of the present application, an indoor throttling element is disposed on a liquid pipe of the indoor heat exchanger, and an outdoor throttling element is disposed on a liquid pipe of the outdoor heat exchanger;

one end of the second branch is connected to a pipeline between the indoor throttling element and the outdoor throttling element.

In some embodiments of the present application, the air conditioner further has a reverse defrosting operation mode, a circulation flow path of the refrigerant in the reverse defrosting operation mode is the same as that in the cooling operation mode, and when the air conditioner performs the reverse defrosting operation, the indoor throttling element and the outdoor throttling element are fully opened.

Drawings

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

Fig. 1 is a system schematic diagram of an air conditioning apparatus according to an embodiment;

fig. 2 is a refrigerant cycle diagram in a cooling operation of the air conditioner according to the embodiment;

fig. 3 is a refrigerant cycle diagram when the air conditioner according to the embodiment performs a heating operation;

fig. 4 is a refrigerant cycle diagram when the air conditioning apparatus according to the embodiment performs heating and heat storage while operating;

fig. 5 is a refrigerant cycle diagram when the air conditioner according to the embodiment performs heating defrosting while operating;

fig. 6 shows switching conditions of relevant components in the air conditioning apparatus according to the embodiment in different operation modes.

Reference numerals:

w1-outdoor unit; n1-indoor unit;

1-a compressor; 2-a gas-liquid separator;

3-a fourth control valve; a 4-four-way reversing valve;

5-gas side stop valve; 6-indoor heat exchanger,

7-indoor side fan; 8-an indoor throttling element;

9-liquid side stop valve; 10-an indoor throttling element;

11-a flow divider; 12-outdoor side fan;

13-outdoor heat exchanger; 14-a shunt tube;

15-a third control valve; 17-a second control valve;

18-a heat storage heat exchanger; 19-an electronic expansion valve;

20-a fifth control valve; 26-a pressure sensor;

01-defrosting branch; 02-first branch;

03-a second branch; 04-a third branch;

05-fourth branch.

Detailed Description

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

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

The terms "first", "second", "third", "fourth", "fifth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, features defined as "first", "second", "third", "fourth", "fifth" may explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Basic operation principle of air-conditioning apparatus

Referring to fig. 1, the air conditioner of the present application includes an outdoor unit W1 and an indoor unit N1, and the present embodiment is described by taking only one outdoor unit W1 and one indoor unit N1 as an example, but the number of the outdoor units W1 and the number of the indoor units N1 are not limited, and the number of the outdoor units W1 and the number of the indoor units N1 may be two or more to match different conditions and application scenarios.

The air conditioner performs a cooling or heating cycle of the air conditioner through a refrigerant circuit. The refrigeration or heating cycle includes a series of processes involving compression, condensation, expansion, and evaporation. The refrigerant circuit includes a compressor, a condenser, a throttle element, an evaporator, and the like.

The compressor compresses a refrigerant gas in a low-temperature and low-pressure state and discharges the compressed high-temperature and high-pressure refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

The throttling element expands the liquid-phase refrigerant in a high-temperature and high-pressure state condensed in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the throttling element and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator can achieve a cooling effect by heat-exchanging with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner can adjust the temperature of the indoor space throughout the cycle.

The outdoor unit W1 includes an outdoor heat exchanger 13, an outdoor side fan 12, a compressor 1, a gas-liquid separator 2, a four-way selector valve 4, and the like. Along the flowing direction of the refrigerant during heating, a flow divider 11 is arranged at the inlet end of the outdoor heat exchanger 13, and a flow dividing pipe 14 is arranged at the outlet end of the outdoor heat exchanger 13. An outdoor throttling element 10 is arranged at the upstream of the flow divider 11 along the flowing direction of the refrigerant, and a liquid side stop valve 9 is arranged at the upstream of the outdoor throttling element 10. A third control valve 15 is arranged on a pipeline (a third branch 04) between the shunt pipe 14 and the four-way reversing valve 4. And a gas side stop valve 5 is arranged on a pipeline between the four-way reversing valve 4 and the indoor heat exchanger 6.

The indoor unit N1 comprises an indoor heat exchanger 6 and an indoor side fan 7, and an outlet end pipeline of the indoor heat exchanger 6 is provided with an indoor throttling element 8.

With continued reference to fig. 1, the air conditioning apparatus in the present embodiment further includes a heat accumulation/release circuit and a defrosting branch 01.

The heat accumulation/release circuit and the defrosting branch 01 are both provided in the outdoor unit W1.

The heat accumulation/release circuit has a heat accumulation heat exchanger 18.

The air conditioning apparatus in this embodiment has a cooling operation mode, a heating and heat storage simultaneous operation mode, and a heating and defrosting simultaneous operation mode.

Referring to fig. 2, when the air conditioner is in cooling operation, the four-way reversing valve 4 is OFF, that is, the D end of the four-way valve is communicated with the C end, and the E end is communicated with the S end; the third control valve 15 is opened and the heat accumulation/release circuit and the defrost branch 01 are both closed.

The circulation of the refrigerant is as follows: a) high-temperature and high-pressure gaseous refrigerant discharged by the compressor 1 enters the outdoor heat exchanger 13 through the four-way reversing valve 4 and the third control valve 15, the outdoor fan 12 is started to enable air to flow through the outdoor heat exchanger 13, heat in the refrigerant is taken away by air on the outdoor side, and the gaseous refrigerant is condensed into medium-temperature and high-pressure liquid refrigerant; b) the liquid refrigerant flows out of the outdoor throttling element 10, is throttled to a low-pressure two-phase state by the indoor throttling element 8, enters the indoor heat exchanger 6, the indoor fan 7 is started, and the two-phase refrigerant absorbs the heat of the indoor air and is evaporated into a low-pressure gaseous refrigerant to generate a refrigeration effect; c) the low-pressure gaseous refrigerant flows into the gas-liquid separator 2 through the gas-side stop valve 5 and the four-way reversing valve 4, and is sucked into the suction end of the compressor 1 to be compressed, so that the whole refrigeration cycle is completed.

Referring to fig. 3, when the air conditioner performs heating operation, the four-way reversing valve 4 is in an ON state, that is, the D end of the four-way valve is communicated with the E end, and the C end is communicated with the S end; the third control valve 15 is opened and the heat accumulation/release circuit and the defrost branch 01 are both closed.

The circulation of the refrigerant is as follows: a) high-temperature and high-pressure gaseous refrigerant discharged by the compressor 1 enters the indoor heat exchanger 6 through the four-way reversing valve 4 and the air side stop valve 5 to release heat, so that air on the indoor side is heated to generate a heating effect, and the refrigerant is condensed into a medium-temperature and high-pressure liquid state; b) the liquid refrigerant flows out from the indoor throttling element 8, passes through the liquid side stop valve 9, is throttled to a low-pressure two-phase state by the outdoor throttling element 10, is further throttled and depressurized by the flow divider 11 and the flow dividing capillary tube, enters the outdoor heat exchanger 13 to absorb heat and is evaporated into a low-pressure gaseous refrigerant; c) the low-pressure gas refrigerant flows into the gas-liquid separator 2 through the shunt tube 14, the third control valve 15 and the four-way reversing valve 4, is sucked into the suction end of the compressor 1 to be compressed, and thus the whole heating cycle is completed.

Referring to fig. 4, when the air conditioning apparatus performs heating and heat storage while operating, the four-way reversing valve 4 is in an ON state, that is, the D end of the four-way valve is communicated with the E end, and the C end is communicated with the S end; the third control valve 15 is opened and the heat accumulation/release circuit is opened to perform the heat accumulation function; the defrost branch 01 is closed.

The circulation of the refrigerant is as follows: a) the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 1 is divided into two paths, wherein the first path flows to the four-way reversing valve 4, enters the indoor heat exchanger 6 through the air side stop valve 5 to release heat, heats the air inside the chamber to generate a heating effect, and the refrigerant is condensed into a medium-temperature and high-pressure liquid state; b) the second path enters the heat storage heat exchanger 18 through the heat storage/release loop to release heat, and the heat storage medium in the heat storage heat exchanger 18 absorbs the heat to store heat; c) the first path of liquid refrigerant flows out of the indoor throttling element 8, passes through the liquid side stop valve 9 and is merged with the second path of refrigerant flowing out of the heat storage heat exchanger 18; d) the merged refrigerant is throttled to a low-pressure two-phase state by an outdoor throttling element 10, the two-phase refrigerant is further throttled and depressurized by a flow divider 11 and a flow dividing capillary tube, enters an outdoor heat exchanger 13 and is evaporated into a low-pressure gaseous refrigerant; e) the low-pressure gas refrigerant flows into the gas-liquid separator 2 through the shunt pipe 14, the third control valve 15 and the four-way reversing valve 4, and is sucked into the suction end of the compressor 1, so that the whole heating and heat storage cycle is completed.

Referring to fig. 5, when the air conditioner performs heating and defrosting and operates simultaneously, the four-way reversing valve 4 is in an ON state, namely, the D end of the four-way valve is communicated with the E end, and the C end is communicated with the S end; the third control valve 15 is closed; the defrosting branch 01 is opened to exert a defrosting function on the outdoor heat exchanger 13; the heat accumulation/release circuit is opened.

The circulation of the refrigerant is as follows: a) the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 1 is divided into two paths, wherein the first path flows to the four-way reversing valve 4, enters the indoor heat exchanger 6 through the gas side stop valve 5 to release heat, and is condensed into a medium-temperature and high-pressure liquid refrigerant; b) The liquid refrigerant flows out through the indoor throttling element 8 and passes through the liquid side stop valve 9; c) the second path of gaseous refrigerant enters the outdoor heat exchanger 13 through the defrosting branch 01 to be condensed and release heat, melts a frost layer on the surface of the heat exchanger and flows out through the outdoor throttling element 10; d) two paths of liquid refrigerants are converged between the liquid side stop valve 9 and the outdoor throttling element 10, and the converged refrigerants enter the heat storage heat exchanger 18 to absorb heat stored in a heat storage medium and evaporate into low-pressure gaseous refrigerants; e) the low-pressure gaseous refrigerant flows into the gas-liquid separator 2 through the four-way reversing valve 4 and is sucked into the air suction end of the compressor 1 to be compressed, and the whole heating and defrosting cycle is completed.

In other words, when the outdoor heat exchanger 13 is frosted during the heating operation or the simultaneous heating and heat storage operation and a defrosting operation is required, the heat storage heat exchanger 18 does not store heat any more; the defrosting branch 01 is opened, part of the refrigerant enters the indoor heat exchanger 6 to maintain the indoor heating capacity, and after condensation, the refrigerant is throttled and depressurized by the outdoor throttling element 10, and meanwhile, the latent heat of the refrigerant flowing through the defrosting branch 01 is utilized to defrost the outdoor heat exchanger 13.

[ Heat accumulation/release Circuit ]

Referring to fig. 1, the heat accumulation/release circuit has a first branch 02, a second branch 03, and a fourth branch 05;

a fifth control valve 20 is arranged on the first branch 02, one end of the first branch 02 is connected with an outlet end pipeline of the compressor 01, and the other end of the first branch 02 is connected with the fourth branch 05.

One end of the second branch 03 is connected with an outlet of the heat storage heat exchanger 18 during heat storage, the other end of the second branch 03 is connected with a pipeline between the indoor heat exchanger 06 and the outdoor heat exchanger 13, specifically, the pipeline between the liquid side stop valve 9 and the outdoor throttling element 10, and an electronic expansion valve 19 is arranged on the second branch 03.

One end of the third branch 04 is connected with an outlet end pipeline of the outdoor heat exchanger 13, the other end of the third branch 04 is connected with the fourth branch 05, a third control valve 15 is arranged on the third branch 04, and the third branch 04 is simultaneously connected with the defrosting branch 01.

One end of the fourth branch 05 is connected with a pipeline between the outdoor heat exchanger 13 and the compressor 1, specifically, the pipeline between the shunt pipe 14 and the four-way reversing valve 4, and the other end of the fourth branch 05 is connected with an inlet end pipeline when the heat storage heat exchanger 18 stores heat; a second control valve 17 is arranged on the fourth branch 05.

When the air conditioner enters into the heating and heat storage simultaneous operation, the electronic expansion valve 19, the third control valve 15 and the fifth control valve 20 are opened, and the second control valve 17 is closed;

when the air conditioner enters heating and defrosting operation and operates simultaneously, the electronic expansion valve 19 and the second control valve 17 are opened, and the third control valve 15 and the fifth control valve 20 are closed.

Referring to fig. 2 and 3, when the air conditioning apparatus is operating for cooling and heating, the heat accumulation/release circuit is closed, meaning that the electronic expansion valve 19, the second control valve 17, and the fifth control valve 20 are all closed.

Referring to fig. 4, when the air conditioner performs simultaneous heating and heat storage operation, the opening of the heat storage/release circuit means: the electronic expansion valve 19 and the fifth control valve 20 are opened and the second control valve 17 is closed, while the third control valve 15 is opened.

The flow path of the refrigerant in the heat accumulation/release circuit at this time is: the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 enters the heat storage heat exchanger 18 through the fifth control valve 20 to release heat, and the heat storage medium in the heat storage heat exchanger 18 absorbs the heat to store heat; the refrigerant flows out of the heat storage heat exchanger 18, passes through the electronic expansion valve 19, and merges with the refrigerant flowing out of the indoor heat exchanger 6 downstream of the liquid-side shutoff valve 9. The electronic expansion valve 19 controls the flow rate of the refrigerant entering the heat storage heat exchanger 18.

A pressure sensor 26 is provided in the discharge line of the compressor 1, and the pressure sensor 26 is used to detect the discharge pressure Pd of the compressor 1.

After the air conditioner performs the heating operation for time t1, it is determined whether the indoor side heating capacity satisfies the requirement, and in this embodiment, it is determined whether the pressure Pd reaches the system set value Pdo.

Specifically, if the pressure value Pd detected by the pressure sensor 26 is greater than the system set value Pdo, which indicates that the indoor side meets the heating capacity at this time, the fifth control valve 20 is opened, and the air conditioning apparatus is adjusted from the heating operation to the heating and heat storage simultaneous operation; if the pressure value Pd detected by the pressure sensor 26 is not greater than the system set value Pdo, which indicates that the indoor side does not satisfy the heating capacity at this time, the fifth control valve 20 is closed, and the air conditioning apparatus continues the heating operation to preferentially ensure the heating capacity of the indoor side.

In this example, Pdo is in the range of 1.5 to 3.5MPa, preferably 2.2 MPa.

After the air conditioner enters the simultaneous heating and heat storage operation mode, in order to ensure sufficient heat storage, the opening degree of the electronic expansion valve 19 needs to be controlled, and the control target is the supercooling degree of the refrigerant at the outlet of the heat storage heat exchanger 18.

Referring to fig. 5, when the air conditioner enters heating and defrosting operation and operates simultaneously, the opening of the heat accumulation/release loop means that: the electronic expansion valve 19 and the second control valve 17 are opened and the fifth control valve 20 is closed, while the third control valve 15 is closed.

One path of high-temperature and high-pressure gaseous refrigerant discharged from the compressor 1 flows into the indoor heat exchanger 6 through the four-way reversing valve 4 to release heat, and is condensed into medium-temperature and high-pressure liquid refrigerant, and the liquid refrigerant flows out through the indoor throttling element 8 and passes through the liquid side stop valve 9; one path enters the outdoor heat exchanger 13 through the defrosting branch 01 to be condensed and released, a frost layer on the surface of the heat exchanger 13 is melted, and the frost layer flows out through the outdoor throttling element 10; the two paths of refrigerants are converged between the liquid side stop valve 9 and the outdoor throttling element 10, the converged refrigerants are throttled and decompressed into a gas-liquid two-phase state through the electronic expansion valve 19, and enter the heat storage heat exchanger 18 to absorb heat stored in a heat storage medium and evaporate into a low-pressure gaseous refrigerant; the low-pressure gaseous refrigerant flows into the compressor through the second control valve 17 and the four-way reversing valve 4.

[ defrosting branch ]

Referring to fig. 1, one end of the defrosting branch 01 is connected to an outlet end pipe of the compressor 01, and the other end is connected to the outdoor heat exchanger 13.

The defrosting branch 01 is provided with a fourth control valve 3, and the fourth control valve 3 is used for controlling the circulation of the refrigerant on the defrosting branch 01.

When the air conditioning device performs refrigeration operation, heating operation or heating and heat storage simultaneous operation, the defrosting branch is closed, namely: the fourth control valve 3 is closed.

When the air conditioning device heats and defrosts and operates simultaneously, the defrosting branch 01 is opened, which means that: the fourth control valve 3 is opened.

The fourth control valve 3 is a solenoid valve or an electronic expansion valve.

When the fourth control valve 3 is an electromagnetic valve, the latent heat of the high-pressure refrigerant is used for defrosting.

When the fourth control valve 3 is an electronic expansion valve, the pressure in the outdoor heat exchanger 13 during defrosting is controlled to defrost by the latent heat of the medium pressure.

During defrosting, the electronic expansion valve 19 is used to regulate the evaporation pressure of the refrigerant in the heat storage heat exchanger 18.

Reverse defrosting and heating defrosting

The air conditioning apparatus in this embodiment further has a reverse defrosting operation mode, and the circulation flow path of the refrigerant in the reverse defrosting operation mode is the same as that in the refrigeration operation mode, and is not described again. Unlike the cooling operation, when the air conditioner performs the reverse defrosting operation, the indoor fan 7 stops operating to prevent cold air from being blown into the indoor side; the outdoor side fan 12 stops operating to reduce heat dissipation to the outside; to reduce the decrease in suction pressure, the indoor throttling element 8 and the outdoor throttling element 10 are fully opened.

Fig. 6 shows the switching of the relevant components in the air conditioning apparatus according to this embodiment in different operation modes, so that the reader can more clearly understand the solution of the present application.

In this embodiment, the first control valve 16 and the second control valve 17 are both solenoid valves, and the third control valve 15 is a two-way valve or a solenoid valve.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An air conditioning apparatus comprising:

characterized in that, the air conditioning device further comprises:

2. The air conditioner according to claim 1,

one end of the defrosting branch is connected with an outlet end pipeline of the compressor, the other end of the defrosting branch is connected with the outdoor heat exchanger, a fourth control valve is arranged on the defrosting branch, and the fourth control valve is used for controlling circulation of refrigerant on the defrosting branch.

3. Air conditioning unit according to claim 2,

the fourth control valve is a solenoid valve or an electronic expansion valve.

4. The air conditioner according to claim 1,

the air conditioner is characterized in that an electronic expansion valve is arranged on the heat storage/release loop, and the supercooling degree of the refrigerant at the outlet of the heat storage heat exchanger is adjusted by controlling the opening degree of the electronic expansion valve when the air conditioner performs heating and heat storage and operates at the same time.

5. The air conditioner according to claim 1,

a fifth control valve is further arranged on the heat accumulation/release circuit and used for allowing or blocking the refrigerant flowing out of the compressor to directly flow into the heat accumulation/release circuit;

and a pressure sensor is arranged on an exhaust pipeline of the compressor.

6. Air conditioning unit according to any of claims 1 to 5,

the heat accumulation/release loop is provided with a first branch, a second branch and a fourth branch;

7. Air conditioning unit according to claim 6,

an indoor throttling element is arranged on a liquid pipe pipeline of the indoor heat exchanger, and an outdoor throttling element is arranged on a liquid pipe pipeline of the outdoor heat exchanger;

8. Air conditioning unit according to claim 7,

the air conditioner also has a reverse defrosting operation mode, the circulation flow paths of the refrigerant in the reverse defrosting operation mode and the circulation flow paths in the refrigerating operation mode are the same, and when the air conditioner performs reverse defrosting operation, the indoor throttling element and the outdoor throttling element are fully opened.