CN110701821A - Air conditioner, control method and device thereof, and computer-readable storage medium - Google Patents

Abstract

The invention provides an air conditioner, a control method and a control device thereof and a computer readable storage medium, wherein a heat accumulator comprises a first heat exchange tube and a second heat exchange tube, the first heat exchange tube is connected with an indoor heat exchanger in parallel, and the first heat exchange tube is connected with a first switch device for controlling the on-off of the first heat exchange tube. According to the air conditioner provided by the invention, in the defrosting mode, the first reversing piece does not reverse, so that heat can be continuously supplied to the indoor space, the heating of the air conditioner is not influenced, and the using comfort of a user is not influenced; and because the heat accumulator is connected with the indoor heat exchanger in parallel, when in heat storage, part of the refrigerant flows through the indoor heat exchanger, and part of the refrigerant flows through the one-way valve and enters the heat accumulator to join and flow to the first throttling component, so that the heat storage can be controlled during heat storage, the heat can not be stored under the working condition that the heat is not required to be stored, the heat loss is reduced, and the fluctuation of the indoor temperature is avoided.

Description

Air conditioner, control method and device thereof, and computer-readable storage medium

Technical Field

The present invention relates to the field of refrigeration equipment, and more particularly, to an air conditioner, a control method thereof, a control device thereof, and a computer-readable storage medium.

Background

The traditional defrosting modes mainly comprise two modes: 1) in the heating operation process of the air conditioner, the first reversing piece is reversed to be refrigeration cycle, and high-temperature and high-pressure refrigerant discharged by the compressor enters the outdoor heat exchanger through the first reversing piece to defrost. 2) Defrosting is carried out by bypassing, and high-temperature and high-pressure refrigerant discharged by the compressor directly enters the outdoor heat exchanger for defrosting without reversing through the indoor unit.

In the method 1), the compressor needs to be stopped for 2 times due to the need of reversing, so that the defrosting time is long, and the suction temperature of the compressor is extremely low during defrosting. A large amount of liquid refrigerants enter the compressor to easily cause liquid impact, and the service life of the compressor is influenced.

In the method 2), the bypass defrosting is performed because the system does not form pressure difference during defrosting, the exhaust temperature is rapidly reduced, and the condition of incomplete defrosting can occur in a low-temperature environment and a multi-row heat exchanger.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art.

To this end, a first aspect of the present invention is directed to an air conditioner.

A second aspect of the invention aims to provide a control method.

A third aspect of the present invention is directed to a control apparatus.

A fourth aspect of the present invention is directed to an air conditioner.

A fifth aspect of the present invention is directed to a computer-readable storage medium.

To achieve the above object, an aspect of the present invention provides an air conditioner, including: a compressor including an exhaust port and an intake port; the first reversing piece comprises a first port, a second port and a fourth port, one of the second port and the fourth port is communicated with the first port, the other of the second port and the fourth port is communicated with the third port, and the first port is connected with the exhaust port; the second port is connected with the first end of the outdoor heat exchanger, and the fourth port is connected with the first end of the indoor heat exchanger; the heat accumulator comprises a first heat exchange tube and a second heat exchange tube, the first heat exchange tube is connected with the indoor heat exchanger in parallel, and the first heat exchange tube is connected with a first switch device for controlling the on-off of the first heat exchange tube; the second reversing piece comprises a first connecting port and a third connecting port, the first connecting port is selectively communicated with one of the second connecting port and the third connecting port, the first connecting port is connected with the third connecting port, the second connecting port is connected with the air inlet through a first connecting pipeline, the third connecting port is connected with one end of the second heat exchange pipe, and the second heat exchange pipe is connected with the first connecting pipeline in parallel.

According to the air conditioner provided by the technical scheme, in the heating mode, when the defrosting is not needed, the heat accumulator is subjected to heat storage. During heat storage, the first switch device is opened, and the refrigerant flows through the first heat exchange tube to store heat.

And in the heating mode, when the defrosting is needed, entering a defrosting mode. In the defrosting mode, the first connecting port is communicated with the third connecting port, refrigerant discharged from an exhaust port of the compressor flows into the outdoor heat exchanger through the indoor heat exchanger, the refrigerant releases heat in the outdoor heat exchanger to defrost, the refrigerant flows into the second heat exchange tube through the first connecting port and the third connecting port after defrosting, the refrigerant evaporates in the heat accumulator and flows back to an air inlet of the compressor.

In the defrosting mode, the first reversing piece does not reverse, so that heat can be continuously supplied to the indoor space, the heating of the air conditioner is not influenced, and the using comfort of a user is not influenced; the refrigerant flows through the first heat exchange tube to store heat, so that the problem of insufficient heat storage of the heat accumulator is avoided, the defrosting time is shortened, and the defrosting is clean; the on-off of the first heat exchange tube is controlled by controlling the on-off of the first switch device, so that controllable heat storage is realized, the first switch device can be controlled to be closed under the working condition that heat storage is not needed, heat is not stored, and energy loss is reduced.

In addition, the air conditioner provided by the technical scheme of the invention also has the following additional technical characteristics:

in one embodiment, an air conditioner includes: a second connecting pipeline is connected between a confluence part of a second end of the indoor heat exchanger and the other end of the first heat exchange tube and a second end of the outdoor heat exchanger, and the first throttling component is connected in series on the second connecting pipeline; and the bypass pipeline is connected with the first throttling component in parallel, and a second switch device for controlling the on-off of the bypass pipeline is arranged on the bypass pipeline.

And opening the second switching device, conducting the bypass pipeline, closing the second switching device and disconnecting the bypass pipeline. The refrigerant can selectively flow through the first throttling component and the bypass pipeline by arranging the bypass pipeline and the second switching device, so that the heat exchange condition (whether condensation or evaporation) of the refrigerant in the outdoor heat exchanger is controlled.

In one embodiment, the first throttling component includes a cooling throttling component and a heating throttling component which are connected in series, the heating throttling component is connected with the bypass pipeline in parallel, or the whole of the cooling throttling component and the heating throttling component is connected with the bypass pipeline in parallel, the cooling throttling component is configured to throttle in a cooling mode, the heating mode is conducted in a one-way mode along a direction from the second end of the indoor heat exchanger to the second end of the outdoor heat exchanger, the heating throttling component is configured to throttle in a heating mode, and the cooling mode is conducted in a one-way mode along a direction from the second end of the outdoor heat exchanger to the second end of the indoor heat exchanger.

If the refrigerant flowing out of the second end of the indoor heat exchanger flows into the outdoor heat exchanger, the refrigerant does not flow through the first throttling part for throttling, but flows through the bypass pipeline, so that the refrigerant can be condensed in the outdoor heat exchanger to release heat, and the outdoor heat exchanger is defrosted. If the refrigerant flowing out of the second end of the indoor heat exchanger flows into the outdoor heat exchanger through the first throttling part, the refrigerant is evaporated and absorbs heat in the outdoor heat exchanger.

In one embodiment, the first throttling component comprises a throttling component body with a throttling function and a third switching device which is connected with the throttling component body in series and is used for controlling the on-off of a pipeline where the throttling component body is located.

In the case that the first throttling part comprises the throttling part body and the third switching device, if the refrigerant flowing out of the second end of the indoor heat exchanger flows into the outdoor heat exchanger, the refrigerant does not pass through the first throttling part for throttling but flows through the bypass pipeline, so that the refrigerant can be condensed in the outdoor heat exchanger to release heat, and the outdoor heat exchanger is defrosted. If the refrigerant flowing out of the second end of the indoor heat exchanger flows into the outdoor heat exchanger through the first throttling part, the refrigerant is evaporated and absorbs heat in the outdoor heat exchanger.

In one embodiment, the first switch device comprises a one-way valve and a solenoid valve, the one-way valve and the solenoid valve are connected with the first heat exchange pipe in series, and the one-way valve is communicated in one direction from the fourth port to the first heat exchange pipe; or, the first switch device comprises a bidirectional electromagnetic stop valve, and the bidirectional electromagnetic stop valve is connected with the first heat exchange tube in series.

The one-way valve is in one-way conduction along the direction from the fourth port to the first heat exchange tube, so that a refrigerant flowing out of the second end of the outdoor heat exchanger in the refrigeration mode cannot pass through the one-way valve, the refrigerant cannot flow through the first heat exchange tube, the temperature of the heat accumulator is prevented from being reduced due to the fact that the refrigerant flows into the first heat exchange tube, the electromagnetic valve can control the on-off of the first heat exchange tube, the electromagnetic valve is opened, the first heat exchange tube is in conduction, the refrigerant can flow through the first heat exchange tube in the heating mode, and heat is. The electromagnetic valve can be a one-way electromagnetic stop valve or a two-way electromagnetic stop valve.

The bidirectional electromagnetic stop valve is connected with the first heat exchange tube in series and used for controlling the on-off of the first heat exchange tube, when the bidirectional electromagnetic stop valve is opened, the first heat exchange tube is conducted, the refrigerant can flow through the first heat exchange tube, when the bidirectional electromagnetic stop valve is closed, the first heat exchange tube is disconnected, the refrigerant cannot flow through the first heat exchange tube, and therefore the state of the heat accumulator can be selectively controlled.

In one embodiment, a second throttling component is connected in series between the third connecting port and the one end of the second heat exchange pipe.

The second throttling component throttles the refrigerant, so that the refrigerant can be evaporated in the second heat exchange tube and then flows back to the air inlet of the compressor.

In one embodiment, the heat accumulator comprises a heat accumulation cavity, at least parts of the first heat exchange tube and the second heat exchange tube are located in the heat accumulation cavity, and a heat accumulation material is filled in the heat accumulation cavity and comprises a phase change material.

At least parts of the first heat exchange tube and the second heat exchange tube are arranged in a heat storage cavity of the heat accumulator, so that the first heat exchanger and the second heat exchanger can be protected to a certain extent, and the heat accumulator is in a stable state in the working process of the air conditioner. The heat storage cavity is filled with a heat storage material, and heat storage and heat release of the heat accumulator are realized by utilizing the phase change of the heat storage material.

The heat storage material is made of a phase-change material, and the physical property of the phase-change material is utilized to change the physical form of the phase-change material so as to absorb or release heat. The air conditioner of the invention stores heat in the heat accumulator by arranging a certain amount of phase change material in the heat accumulator, and the phase change material changes in shape and releases heat to accelerate defrosting in the defrosting process.

In one embodiment, the phase change temperature of the heat storage material is less than or equal to 70 ℃, and the phase change temperature of the heat storage material is lower, so that when the temperature of a refrigerant is lower, the refrigerant passes through the first heat exchange tube, and the heat accumulator can still store heat; and/or the heat storage material comprises at least one of water, paraffin, ethylene glycol aqueous solution and disodium hydrogen phosphate dodecahydrate.

In one embodiment, a temperature detection device is arranged in the heat accumulator.

The temperature detection device is used for detecting the temperature of the heat accumulator, and further, the temperature detection device is used for detecting the temperature of the heat accumulation material. Whether the heat accumulator needs heat accumulation is judged by detecting the temperature of the heat accumulator, so that the controllable heat accumulation of the heat accumulator is realized.

An aspect of a second aspect of the present invention provides a control method of an air conditioner for controlling the air conditioner according to any one of the aspects of the first aspect, the control method including: and under the heating mode, the defrosting is judged to be needed, and the first connecting port and the third connecting port of the second reversing piece are controlled to be communicated so that the refrigerant flows through the second heat exchange tube.

According to the control method provided by the technical scheme of the second aspect of the invention, in the heating mode, when defrosting is needed, the defrosting mode is entered. In the defrosting mode, the first connecting port is communicated with the third connecting port, refrigerant discharged from an exhaust port of the compressor flows into the outdoor heat exchanger through the indoor heat exchanger, the refrigerant releases heat in the outdoor heat exchanger to defrost, the refrigerant flows into the second heat exchange tube through the first connecting port and the third connecting port after defrosting, the refrigerant evaporates in the heat accumulator and flows back to an air inlet of the compressor.

In the defrosting mode, the first reversing piece does not reverse, so that heat can be continuously supplied to the indoor space, the heating of the air conditioner is not influenced, and the using comfort of a user is not influenced; the refrigerant flows through the first heat exchange tube to store heat, so that the problem of insufficient heat storage of the heat accumulator is avoided, the defrosting time is shortened, and the defrosting is clean; the on-off of the first heat exchange tube is controlled by controlling the on-off of the first switch device, so that controllable heat storage is realized, the first switch device can be controlled to be closed under the working condition that heat storage is not needed, heat is not stored, and energy loss is reduced.

In one embodiment, in the heating mode, it is determined that defrosting is required, and the first connection port of the second reversing piece is controlled to be communicated with the third connection port, the method further includes: and controlling the first switch device to be closed and controlling the second switch device to be opened so as to disconnect the first heat exchange pipe and conduct the bypass pipeline.

The first switching device is controlled to be closed, and the first heat exchange tube is disconnected, so that the refrigerant is prevented from entering the first heat exchange tube to store heat; the second switch device is controlled to be opened, so that the bypass pipeline is conducted, the refrigerant flows through the bypass pipeline in the process of flowing out of the second end of the indoor heat exchanger to the second end of the outdoor heat exchanger, throttling is not performed through the first throttling part, and therefore the refrigerant is condensed in the outdoor heat exchanger to release heat, and defrosting is achieved.

In one of them embodiment, the air conditioner includes indoor electric heater and outdoor fan, under the mode of heating, judges to need to change the frost, and the first connector of control second switching-over piece is linked together with the third connector, still includes: and controlling the indoor electric heater to be started and controlling the outdoor fan to be closed.

Turn on indoor electric heater under the defrosting mode, turn on indoor electric heater, heat the room air through indoor electric heating, improve the temperature of room air, prevent the reduction of the room temperature that leads to because of defrosting.

And the outdoor fan is controlled to be closed in the defrosting mode, so that the heat exchange between the refrigerant and the outside air is reduced, the defrosting effect of the refrigerant is enhanced, and the defrosting efficiency and the defrosting effect are further ensured.

In one embodiment, the duration of a single defrost is less than or equal to 4 min.

The duration of single defrosting is less than or equal to 4min, and the indoor temperature reduction caused by overlong single defrosting time is avoided.

In one embodiment, the method comprises the following steps: and under the heating mode, judging that heat storage is needed, controlling the first connecting port of the second reversing piece to be communicated with the third connecting port, controlling the first switching device to be opened so as to conduct the first heat exchange tube, and controlling the second switching device to be closed so as to disconnect the bypass pipeline.

And when the heating mode judges that heat storage is needed, entering a heat storage mode. In the heat storage mode, the first switch device is turned on, the first heat exchange tubes are conducted, the refrigerant flowing out of the air outlet of the compressor is divided into two paths after passing through the first reversing piece, one portion of the refrigerant flows through the indoor heat exchanger to be heated, one portion of the refrigerant flows through the first heat exchange tubes, and the heat accumulator stores heat. Because the second switch device is closed, the bypass pipeline is disconnected, the refrigerant flowing through the first heat exchange tube and the indoor heat exchanger is converged and then flows through the first throttling component for throttling, and the refrigerant enters the outdoor heat exchanger for evaporation and heat absorption, so that the heating of the air conditioner is realized.

In one embodiment, in the heating mode, after determining that heat storage is required, controlling the first connection port of the second reversing element to communicate with the third connection port, controlling the first switching device to be opened to conduct the first heat exchange tube, and controlling the second switching device to be closed to disconnect the bypass line, the method further includes: judging whether the difference between the temperature of the heat accumulator and the phase change temperature of the heat accumulation material is greater than or equal to a preset difference or not; if yes, the first switching device is controlled to be closed, so that the first heat exchange tube is disconnected.

When the difference between the temperature of the heat accumulator and the phase change temperature is larger than or equal to the preset difference, the first switching device is controlled to be closed, the first heat exchange tube is disconnected, the heat accumulation process is finished, and if defrosting is not needed at the moment, the first connecting port and the second connecting port of the second reversing piece are controlled to be communicated, so that normal heating is realized.

The temperature of the heat accumulator is detected through the temperature detection device, the size relation between the difference value between the temperature of the heat accumulator and the phase change temperature of the heat accumulation material and a preset difference value is judged, when the difference value is larger than or equal to the preset difference value, the heat accumulation is judged to be finished, if defrosting is not needed at the moment, a heating process is executed, and if defrosting is needed at the moment, a defrosting mode is executed. And when the difference value is smaller than the preset difference value, continuously storing heat. Further, when the difference is smaller than the preset difference, if defrosting is not needed, heat storage is continued, and if defrosting is needed, a defrosting mode is executed.

In one embodiment, the predetermined difference is in a range of 0 ℃ to 10 ℃. The preset difference may be, but is not limited to, 0 ℃, 5 ℃, or 10 ℃.

In one embodiment, the determining that heat storage is required specifically includes: detecting the outdoor environment temperature; determining whether the outdoor environment temperature is less than or equal to a first preset temperature; if yes, judging that heat storage is needed; or detecting the coil temperature of the outdoor heat exchanger; judging whether the temperature of a coil of the outdoor heat exchanger is less than or equal to a second preset temperature or not; if yes, the heat storage is determined to be needed.

And under the heating mode, whether the outdoor heat exchanger has the risk of frosting or not is judged by detecting the outdoor environment temperature. When the outdoor environment temperature is lower than or equal to the first preset temperature, which indicates that the outdoor heat exchanger has a risk of frosting, the first switching device needs to be opened, and the refrigerant flows through the first heat exchange tube to store heat for the heat accumulator. When the outdoor environment temperature is higher than the first preset temperature, the outdoor environment temperature is higher, the outdoor heat exchanger does not have the risk of frosting, the first switching device is controlled to be switched off, and the heat accumulator does not need to accumulate heat.

And under the heating mode, whether the outdoor heat exchanger has the risk of frosting or not is judged by detecting the temperature of the coil pipe of the outdoor heat exchanger. When the temperature of the coil pipe of the outdoor heat exchanger is smaller than or equal to the second preset temperature, the frosting risk of the outdoor heat exchanger is indicated, the first switch device needs to be opened, and the refrigerant flows through the first heat exchange pipe to store heat for the heat accumulator. When the temperature of the coil of the outdoor heat exchanger is higher than the second preset temperature, the coil of the outdoor heat exchanger is higher in temperature, the outdoor heat exchanger does not have the risk of frosting, the first switching device is controlled to be switched off, and the heat accumulator does not need heat storage.

In one embodiment, the first predetermined temperature is in the range of 2 ℃ to 10 ℃, and the first predetermined temperature may be, but is not limited to, 2 ℃, 4 ℃, 6 ℃, 8 ℃ or 10 ℃; the second preset temperature is 0 ℃.

In one embodiment, the method comprises the following steps: and under the refrigeration mode, the first connecting port and the second connecting port of the second reversing piece are controlled to be communicated, the first switching device is controlled to be closed so as to disconnect the first heat exchange tube, and the second switching device is controlled to be closed so as to disconnect the bypass pipeline.

After the refrigerant flows out of the second end of the outdoor heat exchanger, the bypass pipeline is disconnected, the refrigerant flows into the first throttling component for throttling, the first throttling component comprises a refrigerating throttling component and a heating throttling component for throttling, the refrigerant flows into the refrigerating throttling component for throttling, the first switch device is closed, the first heat exchange tube is disconnected, the refrigerant cannot flow into the first heat exchange tube, and the refrigerant throttled by the first throttling component flows into the indoor heat exchanger for evaporation and heat absorption to realize refrigeration. And the first connecting port and the second connecting port of the second reversing piece are communicated, and the refrigerant flows back to the air inlet of the compressor through the first connecting port and the second connecting port after flowing out of the indoor heat exchanger.

An aspect of the third aspect of the present invention provides a control device, including a processor and a memory, where the processor is configured to implement the steps of the control method according to any one of the first aspect of the present invention when executing the computer program stored in the memory.

An aspect of the fourth aspect of the present invention provides an air conditioner including the control device according to the third aspect.

An aspect of the fifth aspect of the present invention provides a computer-readable storage medium having a computer program (instructions) stored thereon, characterized in that: the computer program (instructions), when executed by a processor, implement the steps of the control method according to any one of the claims of the second aspect.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, in which solid arrows indicate a flow direction of a refrigerant in a cooling mode, and hollow arrows indicate a flow direction of a check valve;

fig. 2 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, in which solid arrows indicate a flow direction of a refrigerant in a heating mode, and hollow arrows indicate a flow direction of a check valve;

fig. 3 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, in which solid arrows indicate a flow direction of a refrigerant in a heat storage state, and hollow arrows indicate a flow direction of a check valve;

fig. 4 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, in which solid arrows indicate a flow direction of a refrigerant in a defrosting mode, and hollow arrows indicate a flow direction of a check valve;

FIG. 5 is a control diagram of the various components of the air conditioner in a cooling mode according to one embodiment of the present invention;

fig. 6 is a control diagram of the components in the heating mode of the air conditioner according to an embodiment of the present invention;

fig. 7 is a control diagram of the respective components in the heat accumulation mode of the air conditioner according to an embodiment of the present invention;

FIG. 8 is a control diagram of various components in a defrosting mode of an air conditioner according to an embodiment of the present invention;

FIG. 9 is a flow chart illustrating a control method according to an embodiment of the present invention;

FIG. 10 is a flow chart illustrating a control method according to an embodiment of the present invention;

FIG. 11 is a flow chart illustrating a control method according to an embodiment of the present invention;

FIG. 12 is a flow chart illustrating a control method according to an embodiment of the present invention;

fig. 13 is a schematic block diagram of a control device according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 13 is:

1 compressor, 11 exhaust ports, 12 air inlets, 2 first reversing parts, 21 first ports, 22 second ports, 23 third ports, 24 fourth ports, 3 outdoor heat exchangers, 4 first throttling parts, 41 heating throttling parts, 42 refrigerating throttling parts, 5 heat accumulators, 51 first heat exchange tubes, 52 second heat exchange tubes, 53 second throttling parts, 54 heat accumulation cavities, 6 second reversing parts, e first connecting ports, f second connecting ports, g third connecting ports, 7 indoor heat exchangers, 8 first switching devices, 81 one-way valves, 82 electromagnetic valves, 10 first connecting pipelines, 20 second connecting pipelines, 30 bypass pipelines, 31 second switching devices, 200 control devices, 204 memories and 206 processors.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.

An air conditioner, a control method, a control apparatus, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 13.

The air conditioner comprises a compressor 1, a first reversing piece 2, an outdoor heat exchanger 3, an indoor heat exchanger 7, a heat accumulator 5 and a second reversing piece 6.

The compressor 1 includes an exhaust port 11 and an intake port 12.

The first direction changing member 2 includes first to fourth ports 21 to 24, one of the second and fourth ports 22 and 24 is communicated with the first port 21, the other of the second and fourth ports 22 and 24 is communicated with the third port 23, the first port 21 is connected to the discharge port 11, the second port 22 is connected to the first end of the outdoor heat exchanger 3, and the fourth port 24 is connected to the first end of the indoor heat exchanger 7. The first direction changing member 2 may be a four-way valve.

The heat accumulator 5 comprises a first heat exchange tube 51 and a second heat exchange tube 52, the first heat exchange tube 51 is connected with the indoor heat exchanger 7 in parallel, and the first heat exchange tube 51 is connected with a first switch device 8 for controlling the on-off of the first heat exchange tube 51.

The second direction changing member 6 includes a first connection port e selectively communicated with one of a second connection port f and a third connection port g, the first connection port e is connected with the third connection port 23, the second connection port f is connected with the gas inlet 12 through the first connection pipe 10, the third connection port g is connected with one end of the second heat exchange pipe 52, and the second heat exchange pipe 52 is connected in parallel with the first connection pipe 10.

The third reversing element may be a three-way valve, or the third reversing element includes a first valve and a second valve, the first valve is connected in series between the third port 23 and the gas inlet 12, the second valve is disposed on the second heat exchange tube 52, the second heat exchange tube 52 is connected in parallel with the first valve, one interface of the first valve forms the first connection port e, one interface of the second valve forms the third connection port g, and the other interface of the first valve and the other interface of the second valve form the first connection port e together.

According to the air conditioner provided by the technical scheme of the invention, in the heating mode, when the defrosting is judged not to be needed, the heat accumulator 5 is subjected to heat accumulation. In the heat accumulation, the first switching device 8 is turned on, and the refrigerant flows through the first heat exchange pipe 51 to accumulate heat.

And in the heating mode, when the defrosting is needed, entering a defrosting mode. In the defrosting mode, the first connection port e is communicated with the third connection port g, the refrigerant discharged from the exhaust port 11 of the compressor 1 flows into the outdoor heat exchanger 3 through the indoor heat exchanger 7, the refrigerant releases heat in the outdoor heat exchanger 3 to defrost, the refrigerant flows into the second heat exchange tube 52 through the first connection port e and the third connection port g after defrosting, and the refrigerant evaporates in the heat accumulator 5 and flows back to the air inlet 12 of the compressor 1.

In the defrosting mode, the first reversing piece 2 does not reverse, so that heat can be continuously supplied to the indoor space, the heating of the air conditioner is not influenced, and the comfort of a user is not influenced; in addition, the refrigerant flows through the first heat exchange tube 51 for heat storage, so that the problem of insufficient heat storage of the heat accumulator 5 is avoided, the defrosting time is reduced, and the defrosting is clean; the on-off of the first heat exchange pipe 51 is controlled by controlling the on-off of the first switch device 8, so that controllable heat storage is realized, the first switch device 8 can be controlled to be closed under the working condition that heat storage is not needed, heat is not stored, and energy loss is reduced.

In one embodiment, the air conditioner further includes a first throttling part 4 and a bypass line 30.

A second connecting pipeline 20 is connected between a confluence point of the second end of the indoor heat exchanger 7 and the other end of the first heat exchange pipe 51 and the second end of the outdoor heat exchanger 3, and the first throttling part 4 is connected in series on the second connecting pipeline 20.

The bypass line 30 is connected in parallel with the first throttling component 4, and the bypass line 30 is provided with a second switching device 31 for controlling the on-off of the bypass line 30.

The second switching device 31 is turned on to turn on the bypass line 30, and the second switching device 31 is turned off to turn off the bypass line 30. The bypass line 30 and the second switching device 31 are arranged to enable the refrigerant to selectively flow through the first throttling component 4 and the bypass line 30, so as to control the heat exchange condition (whether condensation or evaporation) of the refrigerant in the outdoor heat exchanger 3.

Specifically, as shown in fig. 1, in the cooling mode, the second switching device 31 is closed, the bypass line 30 is disconnected, and the refrigerant flows through the first throttling part 4 and is condensed in the outdoor heat exchanger 3. As shown in fig. 2, in the heating mode, the second switching device 31 is closed, the bypass line 30 is cut off, and the refrigerant passes through the first throttling part 4 and evaporates in the outdoor heat exchanger 3. As shown in fig. 3, when the accumulator 5 accumulates heat, the second switching device 31 is closed, the bypass line 30 is disconnected, and the refrigerant flows through the first throttling member 4 and evaporates in the outdoor heat exchanger 3. As shown in fig. 4, in the defrosting mode, the second switching device 31 is turned on, the bypass line 30 is conducted, and the refrigerant flows through the bypass line 30 and is condensed in the outdoor heat exchanger 3, thereby defrosting the refrigerant.

The second switching device 31 may be a solenoid valve, and specifically, the solenoid valve may be a one-way solenoid valve or a two-way solenoid valve.

In a specific embodiment, the first throttling component 4 includes a cooling throttling component 42 and a heating throttling component 41 which are connected in series, the heating throttling component 41 is connected in parallel with the bypass pipeline 30, the cooling throttling component 42 is configured to perform throttling in a cooling mode, the heating mode is in one-way conduction along a direction from the second end of the indoor heat exchanger 7 to the second end of the outdoor heat exchanger 3, the heating throttling component 41 is configured to perform throttling in a heating mode, and the cooling mode is in one-way conduction along a direction from the second end of the outdoor heat exchanger 3 to the second end of the indoor heat exchanger 7.

In the defrosting mode, the second switch device 31 is controlled to be opened, the bypass pipeline 30 is conducted, the refrigerant flows out from the second end of the indoor heat exchanger 7, then flows through the refrigeration throttling component 42 and the bypass pipeline 30, and enters the outdoor heat exchanger 3, and the refrigeration throttling component 42 does not have a throttling function on the refrigerant, so that the refrigerant flowing out from the second end of the indoor heat exchanger 7 does not throttle when flowing into the outdoor heat exchanger 3, and is condensed in the outdoor heat exchanger 3 to release heat, and defrosting is performed on the outdoor heat exchanger 3.

The cooling throttling part 42 throttles in the cooling mode, i.e., in the flow direction from the second end of the outdoor heat exchanger 3 to the second end of the indoor heat exchanger 7, and is fully conducted in the direction from the second end of the indoor heat exchanger 7 to the second end of the outdoor heat exchanger 33 in the heating mode, and has no throttling effect. The heating throttle member 41 throttles in the heating mode, i.e., throttles in the flow direction from the second end of the indoor heat exchanger 7 to the second end of the outdoor heat exchanger 3, and is fully conducted in the direction from the second end of the outdoor heat exchanger 3 to the second end of the indoor heat exchanger 7 in the cooling mode, and does not have a throttling effect. The cooling throttle part 42 and the heating throttle part 41 may be throttle valves.

It is understood that the bypass line 30 may be connected in parallel with the entire first throttling element 4, i.e., the cooling throttling element 42 and the heating throttling element 41 are connected in parallel with the bypass line 30 as a whole.

In another specific embodiment, the first throttling element 4 comprises a throttling element body with a throttling function and a third switching device which is connected with the throttling element body in series and is used for controlling the on-off of a pipeline in which the throttling element body is arranged.

In the case where the first throttling member 4 includes the throttling member body and the third switching device, if the refrigerant flowing out from the second end of the indoor heat exchanger 7 flows into the outdoor heat exchanger 3, the refrigerant does not flow through the first throttling part for throttling but flows through the bypass line 30, so that the refrigerant can be condensed in the outdoor heat exchanger 3 to release heat, thereby defrosting the outdoor heat exchanger 3. If the refrigerant flowing out of the second end of the indoor heat exchanger 7 flows into the outdoor heat exchanger 3 through the first throttling part 4, the refrigerant evaporates and absorbs heat in the outdoor heat exchanger 3. The third switch device can be an electromagnetic valve which can be a one-way electromagnetic valve or a two-way electromagnetic valve, and the throttle part body can be an electronic expansion valve, a two-way throttle valve, a capillary tube or a thermal expansion valve.

In a specific embodiment, the first switch device 8 comprises a one-way valve 81 and a solenoid valve 82, and the one-way valve 81 and the solenoid valve 82 are connected in series with the first heat exchanging pipe 51, and the one-way valve 81 is in one-way communication in a direction from the fourth port 24 to the first heat exchanging pipe 51.

The check valve 81 is in one-way conduction along the direction from the fourth port 24 to the first heat exchange tube 51, so that the refrigerant flowing out of the second end of the outdoor heat exchanger 3 in the refrigeration mode cannot pass through the check valve 81, the refrigerant cannot flow through the first heat exchange tube 51, the temperature of the heat accumulator 5 is prevented from being reduced due to the fact that the refrigerant flows into the first heat exchange tube 51, the electromagnetic valve 82 can control the on-off of the first heat exchange tube 51, the electromagnetic valve 82 is opened, the first heat exchange tube 51 is in conduction, and the refrigerant can flow through the first heat exchange tube 51 in the heating mode to accumulate heat in the heat accumulator 5. The solenoid valve 82 may be a one-way solenoid shut-off valve or a two-way solenoid shut-off valve.

Further, the electromagnetic valve 82 is a one-way electromagnetic cut-off valve that is opened to conduct in a direction from the fourth port 24 to the first heat exchanging pipe 51. The first switching device 8 includes the check valve 81, and a control procedure of the air conditioner can be simplified.

In another specific embodiment, the first switching device 8 comprises a two-way electromagnetic cut-off valve, which is connected in series with the first heat exchanging pipe 51.

The two-way electromagnetic cut-off valve is connected in series with the first heat exchange tube 51 and used for controlling the on-off of the first heat exchange tube 51, when the two-way electromagnetic cut-off valve is opened, the first heat exchange tube 51 is conducted, a refrigerant can flow through the first heat exchange tube 51, when the two-way electromagnetic cut-off valve is closed, the first heat exchange tube 51 is disconnected, the refrigerant cannot flow through the first heat exchange tube 51, and therefore the state of the heat accumulator 5 can be selectively controlled.

In one embodiment, a second throttling part 53 is connected in series between the third connecting port g and one end of the second heat exchanging pipe 52.

And in the defrosting mode, the first connecting port e is controlled to be communicated with the third connecting port g, and the refrigerant flowing out of the outdoor heat exchanger 3 enters the second heat exchange tube 52 through the first connecting port e, the third connecting port g and the second throttling component 53 after passing through the first reversing piece 2. The second throttling part 53 throttles the refrigerant so that the refrigerant can be evaporated in the second heat exchanging pipe 52 and then flows back to the air inlet 12 of the compressor 1.

The second throttling part 53 may be a capillary tube, an electronic expansion valve, a thermal expansion valve, or a throttle valve.

In one embodiment, the regenerator 5 comprises a thermal storage chamber 54, at least part of the first and second heat exchange tubes 51, 52 being located within the thermal storage chamber 54, the thermal storage chamber 54 being filled with a thermal storage material comprising a phase change material.

At least parts of the first heat exchange pipe 51 and the second heat exchange pipe 52 are arranged in a heat storage cavity 54 of the heat accumulator 5, so that the first heat exchanger and the second heat exchanger can be protected to a certain extent, and the heat accumulator 5 has a stable state in the working process of the air conditioner. The heat storage cavity is filled with a heat storage material, and heat storage and heat release of the heat accumulator 5 are realized by utilizing the phase change of the heat storage material.

The heat storage material is made of a phase-change material, and the physical property of the phase-change material is utilized to change the physical form of the phase-change material so as to absorb or release heat. The air conditioner of the invention stores heat in the heat accumulator 5 by arranging a certain amount of phase-change materials in the heat accumulator 5, and the phase-change materials change in shape and release heat to accelerate defrosting in the defrosting process.

In one embodiment, the phase change temperature of the heat storage material is less than or equal to 70 ℃, and the phase change temperature of the heat storage material is lower, so that when the temperature of the refrigerant is lower, the refrigerant passes through the first heat exchange tubes 51, and the heat accumulator 5 can still store heat.

The heat storage material comprises at least one of water, paraffin, ethylene glycol aqueous solution and disodium hydrogen phosphate dodecahydrate, and a better phase change material can be selected according to the actual application situation in specific application.

In one embodiment, a temperature sensing device is provided in the thermal accumulator 5.

The temperature detection means is for detecting the temperature of the heat accumulator 5, and further, the temperature detection means is for detecting the temperature of the heat storage material. Whether the heat accumulator 5 needs heat accumulation is judged by detecting the temperature of the heat accumulator 5, so that the controllable heat accumulation of the heat accumulator 5 is realized.

The invention provides an air conditioner, a heat storage defrosting air conditioning system, which comprises a compressor 1, a first reversing piece 2, an outdoor heat exchanger 3, a heating throttle valve (heating throttle part 41), a refrigerating throttle valve (refrigerating throttle part 42), an indoor heat exchanger 7, a second switch device 31 connected with the heating throttle valve in parallel and a heat accumulator 5. The parts are connected by pipelines. The first heat exchange pipe 51 is connected in parallel with the indoor heat exchanger 7, and the second heat exchange pipe 52 is connected in parallel with the first connection pipe 10 through the second direction changer 6. The flow of the refrigerant in the different working modes of the air conditioner will be described below by taking the first reversing element 2 as a four-way valve, the second reversing element 6 as a three-way valve, the refrigerating throttle member 42 as a refrigerating throttle valve, the heating throttle member 41 as a heating throttle valve, and the first switch device 8 including the solenoid valve 82 and the check valve 81 as examples.

The refrigerant flow in the cooling mode is as shown in fig. 1, the compressor 1 compresses the refrigerant into high-temperature high-pressure gas, the refrigerant is connected to the outdoor heat exchanger 3 through the ab port (a is the first port 21, b is the second port 22) of the four-way valve to be condensed into medium-temperature high-pressure liquid refrigerant, the refrigerant is throttled by the cooling throttle valve to be evaporated and absorbed by the indoor heat exchanger 7, and then the refrigerant is connected through the cd port (c is the fourth port 24, d is the third port 23) of the four-way valve and returns to the compressor 1 through the connection port ef (e is the first connection port e, f is the second connection port f) of the three-way valve, wherein the connection port ef is communicated when the three-way valve is set to 0 step, the connection port eg is communicated when the three-way valve is set to 608 step (e is the first connection port e, g is the third connection port g), the control method of each component is, the electromagnetic valve 82 is closed and the opening degree of the second direction changing member 6 is 0 step.

The flow of the refrigerant in the heating mode is shown in fig. 2, the compressor 1 compresses the refrigerant into high-temperature and high-pressure gas, the gas is condensed into medium-temperature and high-pressure liquid in the indoor heat exchanger 7 through an ac port (a is a first port 21, c is a fourth port 24) of the four-way valve, the liquid is condensed into medium-temperature and high-pressure liquid in the indoor heat exchanger, the liquid is heated and absorbed by the outdoor condenser through the heating throttle valve, and finally the liquid returns to the compressor 1 through a bd port (b is a second port 22, d is a third port 23) of the four-way valve and an ef connection port (e is a first connection port e, f is a second connection port f).

As shown in fig. 3, the refrigerant flow of the heat storage process in the heating mode is that the compressor 1 compresses the refrigerant into a high-temperature and high-pressure gas, and the gas passes through the ac port (a is the first port 21, and c is the fourth port 24) of the four-way valve. A part of refrigerant enters the indoor heat exchanger 7 to be condensed into medium-temperature high-pressure liquid, a part of refrigerant enters the heat accumulator 5 through the one-way valve 81 to heat a heat storage material, and joins with the refrigerant passing through the indoor heat exchanger 7 through the electromagnetic valve 82, passes through the heating throttle valve to reach the outdoor heat exchanger 3 to absorb heat, and finally returns to the compressor 1 through a bd port of the four-way valve (b is the second port 22, d is the third port 23) and a ef connector of the three-way valve (e is the first connector e, f is the second connector f).

The refrigerant flow during defrosting is shown in fig. 4, the compressor 1 condenses the refrigerant compressor 1 into high-temperature and high-pressure gas, the high-temperature and high-pressure gas passes through an ac port (a is a first port 21, c is a fourth port 24) of a four-way valve to an indoor heat exchanger 7, the medium-temperature and high-pressure liquid passes through a second switching device 31 and then enters an outdoor heat exchanger 3 to release heat, defrosting is performed on the outdoor heat exchanger 3, the medium-temperature and high-pressure liquid passes through a bd port (b is a second port 22, d is a third port 23) of the four-way valve and a connecting port e of a three-way valve eg (e is a first connecting port e, g is a third connecting port g), the medium-temperature and high-pressure liquid enters a heat accumulator 5 through a second throttling part 53 to be evaporated, and finally returns to the compressor 1, the control method of each part is shown in fig. 8, an indoor electric heater is turned on, the compressor 1 is, wherein, the maximum lasting time of 4min is shown as defrosting mode. The indoor electric heater is started to improve the indoor temperature, and the reduction of the indoor temperature caused by defrosting is avoided.

An aspect of a second aspect of the present invention provides a control method of an air conditioner for controlling the air conditioner according to any one of the aspects of the first aspect.

The first embodiment is as follows:

as shown in fig. 9, the control method includes:

step S90, in the heating mode, it is determined that defrosting is required, and the first connection port e of the second direction changing member 6 is controlled to communicate with the third connection port g, so that the refrigerant flows through the second heat exchanging tube 52.

According to the control method provided by the technical scheme of the second aspect of the invention, in the heating mode, when defrosting is needed, the defrosting mode is entered. In the defrosting mode, the first connection port e is communicated with the third connection port g, the refrigerant discharged from the exhaust port 11 of the compressor 1 flows into the outdoor heat exchanger 3 through the indoor heat exchanger 7, the refrigerant releases heat in the outdoor heat exchanger 3 to defrost, the refrigerant flows into the second heat exchange tube 52 through the first connection port e and the third connection port g after defrosting, and the refrigerant evaporates in the heat accumulator 5 and flows back to the air inlet 12 of the compressor 1.

In the defrosting mode, the first reversing piece 2 does not reverse, so that heat can be continuously supplied to the indoor space, the heating of the air conditioner is not influenced, and the comfort of a user is not influenced; in addition, the refrigerant flows through the first heat exchange tube 51 for heat storage, so that the problem of insufficient heat storage of the heat accumulator 5 is avoided, the defrosting time is reduced, and the defrosting is clean; the on-off of the first heat exchange pipe 51 is controlled by controlling the on-off of the first switch device 8, so that controllable heat storage is realized, the first switch device 8 can be controlled to be closed under the working condition that heat storage is not needed, heat is not stored, and energy loss is reduced.

In one embodiment, in the heating mode, it is determined that defrosting is required, and the first connection port e of the second direction-changing member 6 is controlled to be communicated with the third connection port g, further including: the first switch device 8 is controlled to be closed, and the second switch device 31 is controlled to be opened, so that the first heat exchange pipe 51 is disconnected, and the bypass pipeline 30 is conducted.

The first switch device 8 is controlled to be closed, and the first heat exchange tube 51 is disconnected, so that the refrigerant is prevented from entering the first heat exchange tube 51 for heat storage; the second switch device 31 is controlled to be opened, so that the bypass pipeline 30 is conducted, in the process that the refrigerant flows out from the second end of the indoor heat exchanger 7 to the second end of the outdoor heat exchanger 3, the refrigerant flows through the bypass pipeline 30 and is not throttled by the first throttling part 4, and the refrigerant is condensed in the outdoor heat exchanger 3 to release heat, so that defrosting is realized.

In one of the embodiments, the air conditioner includes indoor electric heater and outdoor fan, under the heating mode, judges that need to change the frost, and the first interface e of control second switching-over piece 6 is linked together with third interface g, still includes: the indoor electric heater is controlled to be started, and the outdoor fan is controlled to be closed.

Turn on indoor electric heater under the defrosting mode, turn on indoor electric heater, heat the room air through indoor electric heating, improve the temperature of room air, prevent the reduction of the room temperature that leads to because of defrosting.

And the outdoor fan is controlled to be closed in the defrosting mode, so that the heat exchange between the refrigerant and the outside air is reduced, the defrosting effect of the refrigerant is enhanced, and the defrosting efficiency and the defrosting effect are further ensured.

In one embodiment, the duration of a single defrost is less than or equal to 4 min.

The duration of single defrosting is less than or equal to 4min, and the indoor temperature reduction caused by overlong single defrosting time is avoided.

Example two:

as shown in fig. 10, the control method includes steps S1002 to S1010.

Step S1002, detecting the current operation mode of the air conditioner;

if the heat exchanger is in the cooling mode, step S1004 is executed, and in the cooling mode, the first connection port e and the second connection port f of the second reversing device 6 are controlled to be communicated, the first switching device 8 is controlled to be closed, so that the first heat exchange tube 51 is disconnected, and the second switching device 31 is controlled to be closed, so that the bypass pipeline 30 is disconnected.

After the refrigerant flows out from the second end of the outdoor heat exchanger 3, the bypass pipeline 30 is disconnected, the refrigerant flows into the first throttling component 4 for throttling, taking the first throttling component 4 comprising the refrigeration throttling component 42 and the heating throttling component 41 as an example, the refrigerant flows into the refrigeration throttling component 42 for throttling, the first switch device 8 is closed, the first heat exchange tube 51 is disconnected, the refrigerant cannot flow into the first heat exchange tube 51, and the refrigerant throttled by the first throttling component 4 flows into the indoor heat exchanger 7 for evaporation and heat absorption, so that refrigeration is realized. The first connection port e and the second connection port f of the second direction changing member 6 are communicated, and the refrigerant flows back to the air inlet 12 of the compressor 1 through the first connection port e and the second connection port f after flowing out of the indoor heat exchanger 7.

If the heat exchange mode is the heating mode, step S1006 is executed, and in the heating mode, it is determined that heat storage is required, the first connection port e of the second reversing element 6 is controlled to be communicated with the third connection port g, the first switch device 8 is controlled to be opened, so that the first heat exchange pipe 51 is conducted, and the second switch device 31 is controlled to be closed, so that the bypass pipeline 30 is disconnected.

And when the heating mode judges that heat storage is needed, entering a heat storage mode. In the heat storage mode, the first switching device 8 is turned on, the first heat exchange tube 51 is conducted, the refrigerant flowing out of the exhaust port 11 of the compressor 1 passes through the first reversing piece 2 and then is divided into two paths, a part of the refrigerant flows through the indoor heat exchanger 7 to be heated, a part of the refrigerant flows through the first heat exchange tube 51, and the heat accumulator 5 stores heat. Because the second switch device 31 is closed, the bypass pipeline 30 is disconnected, the refrigerant flowing through the first heat exchange pipe 51 and the indoor heat exchanger 7 is converged and then flows through the first throttling part 4 for throttling, and the refrigerant enters the outdoor heat exchanger 3 for evaporation and heat absorption, so that the heating of the air conditioner is realized.

Step S1008 of determining whether a difference between the temperature of the heat accumulator 5 and the phase transition temperature of the heat storage material is greater than or equal to a preset difference;

if yes, executing step S1010, controlling the first switching device 8 to be closed, so as to disconnect the first heat exchanging pipe 51;

if not, the process returns to step S1006.

Wherein, step S1008 is located after step S1006.

When the difference between the temperature of the heat accumulator 5 and the phase change temperature is greater than or equal to the preset difference, the first switching device 8 is controlled to be closed, the first heat exchange tube 51 is disconnected, the heat accumulation process is finished, and if defrosting is not needed at the moment, the first connecting port e of the second reversing piece 6 is controlled to be communicated with the second connecting port f, so that normal heating is realized.

The temperature of the heat accumulator 5 is detected through the temperature detection device, the magnitude relation between the difference value between the temperature of the heat accumulator 5 and the phase change temperature of the heat storage material and a preset difference value is judged, when the difference value is larger than or equal to the preset difference value, heat storage is judged to be finished, if defrosting is not needed at the moment, a heating process is executed, and if defrosting is needed at the moment, a defrosting mode is executed. And when the difference value is smaller than the preset difference value, continuously storing heat. Further, when the difference is smaller than the preset difference, if defrosting is not needed, heat storage is continued, and if defrosting is needed, a defrosting mode is executed.

In one embodiment, the predetermined difference is in the range of 0 ℃ to 10 ℃. The preset difference may be, but is not limited to, 0 ℃, 5 ℃, or 10 ℃.

In one embodiment, the determining that heat storage is required specifically includes: detecting the outdoor environment temperature; judging whether the outdoor environment temperature is less than or equal to a first preset temperature or not; if yes, judging that heat storage is needed; or detecting the coil temperature of the outdoor heat exchanger 3; judging whether the temperature of the coil of the outdoor heat exchanger 3 is less than or equal to a second preset temperature or not; if yes, the heat storage is determined to be needed.

In the heating mode, whether the outdoor heat exchanger 3 has a risk of frosting or not is judged by detecting the outdoor environment temperature. When the outdoor environment temperature is less than or equal to the first preset temperature, which indicates that the outdoor heat exchanger 3 is at risk of frosting, the first switching device 8 needs to be opened, and the refrigerant flows through the first heat exchange tube 51 to store heat in the heat accumulator 5. When the outdoor environment temperature is higher than the first preset temperature, the outdoor environment temperature is high, the outdoor heat exchanger 3 does not have the risk of frosting, the first switching device 8 is controlled to be switched off, and the heat accumulator 5 does not need heat accumulation.

Under the heating mode, whether the outdoor heat exchanger 3 has the risk of frosting is judged by detecting the coil temperature of the outdoor heat exchanger 3. When the coil temperature of the outdoor heat exchanger 3 is less than or equal to the second preset temperature, which indicates that the outdoor heat exchanger 3 has a risk of frosting, the first switching device 8 needs to be opened, and the refrigerant flows through the first heat exchange tube 51 to store heat in the heat accumulator 5. When the coil temperature of the outdoor heat exchanger 3 is higher than the second preset temperature, it is indicated that the coil temperature of the outdoor heat exchanger 3 is higher, the outdoor heat exchanger 3 does not have the risk of frosting, the first switching device 8 is controlled to be switched off, and the heat accumulator 5 does not need to accumulate heat.

In one embodiment, the first predetermined temperature is in the range of 2 ℃ to 10 ℃, and the first predetermined temperature may be, but is not limited to, 2 ℃, 4 ℃, 6 ℃, 8 ℃ or 10 ℃; the second predetermined temperature is 0 ℃.

As shown in fig. 11, in a specific embodiment, the first switching device 8 includes a solenoid valve 82 and a check valve 81, and the control method includes steps S1102 to S1112. Step S1102, detecting the power-on mode, and if the cooling mode is selected, executing step S1104 to control the electromagnetic valve 82 to close, at which time the first heat exchanging pipe 51 is disconnected, no high-temperature and high-pressure refrigerant passes through, and no heat is stored. If the heating mode is selected, step S1106 is executed to detect the outdoor environment temperature, and step S1108 judges whether the outdoor environment temperature is greater than or equal to a first preset temperature, for example, the first preset temperature is 7 ℃. If the outdoor environment temperature is greater than or equal to the first preset temperature, it is determined that the outdoor heat exchanger 3 does not have the risk of frosting, step S1110 is executed, the electromagnetic valve 82 is turned off, and the heat accumulator 5 does not accumulate heat; if the outdoor environment temperature is lower than the first preset temperature, it is determined that there is a risk of frosting, and at this time, step S1112 is executed, the electromagnetic valve 82 is opened, and the heat accumulator 5 accumulates heat.

In another specific embodiment, as shown in fig. 12, the first switching device 8 includes a solenoid valve 82 and a check valve 81, and the control method includes steps S1202 to S1216. The first switching device 8 includes the solenoid valve 82 and the check valve 81, and the control method includes steps S1202 to S1212. Step S1202, detecting the power-on mode, if the cooling mode is the cooling mode, executing step S1204 to control the electromagnetic valve 82 to close, at this time, the first heat exchanging pipe 51 is disconnected, no high-temperature and high-pressure refrigerant passes through, and no heat is stored. If the heating mode is selected, step S1206 is executed to detect the outdoor ambient temperature, and step S1208 determines whether the outdoor ambient temperature is greater than or equal to a first preset temperature, for example, the first preset temperature is 7 ℃. If the outdoor environment temperature is greater than or equal to the first preset temperature, the outdoor heat exchanger 3 is considered to have no risk of frosting, step S1210 is executed, the electromagnetic valve 82 is switched off, and the heat accumulator 5 does not accumulate heat; if the outdoor environment temperature is lower than the first preset temperature, it is determined that there is a risk of frosting, and at this time, step S1212 is executed, the electromagnetic valve 82 is opened, and the heat accumulator 5 accumulates heat. Step S1214 is executed to detect whether the difference between the temperature of the heat accumulator 5 and the phase change temperature of the phase change material in the heat accumulator 5 is greater than or equal to a preset difference, if so, step S1216 is executed to close the electromagnetic valve 82, and if not, the step S1212 is returned to, for example, the preset difference may be determined according to the phase change temperature of the phase change material, for example, the phase change temperature of paraffin is 46 ℃ and the preset difference is 4 ℃.

As shown in fig. 13, an embodiment according to a third aspect of the present invention provides a control apparatus 200, which includes a processor 206 and a memory 204, wherein the processor 206 is configured to implement the steps of the control method according to any one of the embodiments according to the first aspect when executing a computer program stored in the memory 204.

An embodiment of a fourth aspect of the present invention provides an air conditioner including the control device 200 as the embodiment of the third aspect.

An embodiment of the fifth aspect of the invention provides a computer-readable storage medium on which a computer program (instructions) is stored, which computer program (instructions), when executed by the processor 206, implements the steps of the control method as in any one of the embodiments of the second aspect.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage mediums comprising computer-usable program code(s) (including, but not limited to, disk storage 204, CD-ROM, optical storage 204, etc.).

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor 206 of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor 206 of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory 204 that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory 204 produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

In the description of the present invention, the term "plurality" means two or more unless explicitly specified or limited otherwise; the terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, or an electrical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

It will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the scope of the invention as defined in the appended claims and their equivalents, and it is intended that the invention encompass such changes and modifications as well.

Claims (22)

1. An air conditioner, comprising:

a compressor including an exhaust port and an intake port;

the first reversing piece comprises a first port, a second port and a fourth port, one of the second port and the fourth port is communicated with the first port, the other of the second port and the fourth port is communicated with the third port, and the first port is connected with the exhaust port;

the second port is connected with the first end of the outdoor heat exchanger, and the fourth port is connected with the first end of the indoor heat exchanger;

the heat accumulator comprises a first heat exchange tube and a second heat exchange tube, the first heat exchange tube is connected with the indoor heat exchanger in parallel, and the first heat exchange tube is connected with a first switch device for controlling the on-off of the first heat exchange tube;

the second reversing piece comprises a first connecting port and a third connecting port, the first connecting port is selectively communicated with one of the second connecting port and the third connecting port, the first connecting port is connected with the third connecting port, the second connecting port is connected with the air inlet through a first connecting pipeline, the third connecting port is connected with one end of the second heat exchange pipe, and the second heat exchange pipe is connected with the first connecting pipeline in parallel.

2. The air conditioner according to claim 1, comprising:

a second connecting pipeline is connected between a confluence part of a second end of the indoor heat exchanger and the other end of the first heat exchange tube and a second end of the outdoor heat exchanger, and the first throttling component is connected in series on the second connecting pipeline;

and the bypass pipeline is connected with the first throttling component in parallel, and a second switch device for controlling the on-off of the bypass pipeline is arranged on the bypass pipeline.

3. The air conditioner according to claim 2,

the first throttling component comprises a refrigerating throttling component and a heating throttling component which are connected in series, the heating throttling component is connected with the bypass pipeline in parallel, or the whole of the refrigerating throttling component and the heating throttling component is connected with the bypass pipeline in parallel.

4. The air conditioner according to claim 2,

the first throttling component comprises a throttling component body with a throttling function and a third switching device which is connected with the throttling component body in series, and the third switching device is used for controlling the on-off of a pipeline where the throttling component body is located.

5. The air conditioner according to claim 1,

the first switch device comprises a one-way valve and an electromagnetic valve, the one-way valve and the electromagnetic valve are connected with the first heat exchange tube in series, and the one-way valve is conducted in one way along the direction from a fourth port to the first heat exchange tube; or, the first switch device comprises a bidirectional electromagnetic stop valve, and the bidirectional electromagnetic stop valve is connected with the first heat exchange tube in series.

6. The air conditioner according to claim 1,

and a second throttling component is connected in series between the third connecting port and one end of the second heat exchange tube.

7. The air conditioner according to any one of claims 1 to 6,

the heat accumulator comprises a heat accumulation cavity, at least part of the first heat exchange tube and at least part of the second heat exchange tube are located in the heat accumulation cavity, a heat accumulation material is filled in the heat accumulation cavity, and the heat accumulation material comprises a phase change material.

8. The air conditioner according to claim 7,

the phase transition temperature of the heat storage material is less than or equal to 70 ℃; and/or

The heat storage material comprises at least one of water, paraffin, ethylene glycol aqueous solution and disodium hydrogen phosphate dodecahydrate.

9. The air conditioner according to any one of claims 1 to 6,

and a temperature detection device is arranged in the heat accumulator.

10. A control method of an air conditioner for controlling the air conditioner according to any one of claims 1 to 9, characterized by comprising:

and under the heating mode, the defrosting is judged to be needed, and the first connecting port and the third connecting port of the second reversing piece are controlled to be communicated so that the refrigerant flows through the second heat exchange tube.

11. The control method according to claim 10, wherein in the heating mode, it is determined that defrosting is required, and the first connection port of the second direction changing member is controlled to communicate with the third connection port, further comprising:

and controlling the first switch device to be closed and controlling the second switch device to be opened so as to disconnect the first heat exchange pipe and conduct the bypass pipeline.

12. The control method according to claim 10, wherein the air conditioner includes an indoor electric heater and an outdoor fan, and when defrosting is determined to be necessary in a heating mode, the first connection port of the second direction-changing member is controlled to be communicated with the third connection port, and the method further includes:

and controlling the indoor electric heater to be started and controlling the outdoor fan to be closed.

13. The control method according to claim 10,

the duration of single defrosting is less than or equal to 4 min.

14. The control method according to any one of claims 10 to 13, characterized by comprising:

and under the heating mode, judging that heat storage is needed, controlling the first connecting port of the second reversing piece to be communicated with the third connecting port, controlling the first switching device to be opened so as to conduct the first heat exchange tube, and controlling the second switching device to be closed so as to disconnect the bypass pipeline.

15. The control method according to claim 14, wherein in the heating mode, after determining that heat storage is required, controlling the first connection port of the second reversing element to communicate with the third connection port, controlling the first switching device to be opened to conduct the first heat exchange tube, and controlling the second switching device to be closed to disconnect the bypass line, the method further comprises:

judging whether the difference between the temperature of the heat accumulator and the phase change temperature of the heat accumulation material is greater than or equal to a preset difference or not;

if yes, the first switching device is controlled to be closed, so that the first heat exchange tube is disconnected.

16. The control method according to claim 15,

the range of the preset difference value is 0-10 ℃.

17. The control method according to claim 14,

the determining that heat storage is required specifically includes:

detecting the outdoor environment temperature;

determining whether the outdoor environment temperature is less than or equal to a first preset temperature;

if yes, judging that heat storage is needed; or

Detecting the temperature of a coil of the outdoor heat exchanger;

judging whether the temperature of a coil of the outdoor heat exchanger is less than or equal to a second preset temperature or not;

if yes, the heat storage is determined to be needed.

18. The control method according to claim 17,

the first preset temperature is in the range of 2-10 ℃; the second preset temperature is 0 ℃.

19. The control method according to any one of claims 10 to 13, comprising:

and under the refrigeration mode, the first connecting port and the second connecting port of the second reversing piece are controlled to be communicated, the first switching device is controlled to be closed so as to disconnect the first heat exchange tube, and the second switching device is controlled to be closed so as to disconnect the bypass pipeline.

20. A control apparatus of an air conditioner, characterized in that the control apparatus comprises a processor and a memory, the processor being configured to implement the steps of the control method of the air conditioner according to any one of claims 10 to 19 when executing a computer program stored in the memory.

21. An air conditioner, comprising:

the control device of an air conditioner according to claim 20.

22. A computer-readable storage medium having stored thereon a computer program, characterized in that: the computer program, when executed by a processor, implements the steps of a control method of an air conditioner as claimed in any one of claims 10 to 19.

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