CN110715483A

CN110715483A - Air conditioner, control method and device thereof, and computer-readable storage medium

Info

Publication number: CN110715483A
Application number: CN201911023687.XA
Authority: CN
Inventors: 黎辉玲; 杜顺开; 谭周衡
Original assignee: Midea Group Co Ltd; Guangdong Midea Refrigeration Equipment Co Ltd
Current assignee: Midea Group Co Ltd; GD Midea Air Conditioning Equipment Co Ltd
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-01-21

Abstract

The invention provides an air conditioner, a control method and a control device thereof, and a computer readable storage medium. When the air conditioner provided by the invention judges that heat storage is needed, the first connecting port of the second reversing piece is controlled to be communicated with the third connecting port, so that a refrigerant flows through the first heat exchange tube to store heat. When heat storage is not needed, the first connecting port of the second reversing piece is controlled to be communicated with the second connecting port, the refrigerant does not flow through the first heat exchange tube, and the heat accumulator does not store heat. Therefore, the second reversing piece is arranged to control the first connecting port to be communicated with the second connecting port or the first connecting port to be communicated with the third connecting port, controllable heat storage is achieved, the working condition heat accumulator which does not need heat storage can not store heat, and energy loss of the system is reduced.

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

When the traditional defrosting mode utilizes heat storage defrosting, a heat accumulator arranged on a compressor shell is used as a main heat source of a defrosting working condition, waste heat of the compressor is absorbed during heating, and during defrosting, a refrigerant flows out of an indoor heat exchanger and then enters an outdoor heat exchanger through a bypass pipeline connected with a throttling component in parallel to defrost.

In the defrosting method, the compressor is used for heat storage and defrosting of the low-temperature heat source, heat storage is carried out by utilizing the heat generated by the compressor, the heat storage is uncontrollable, the phase-change temperature of the phase-change material is low, the heat release speed is low during defrosting, and when the heat storage of the heat storage is insufficient, the problems of long defrosting time, unclean defrosting and the like are caused.

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; a first reversing part comprising first to fourth ports, one of the second and fourth ports being in communication with the first port, the other of the second and fourth ports being in communication with the third port; the second port is connected with the first end of the outdoor heat exchanger, the fourth port is connected with the first end of the indoor heat exchanger, and the second end of the outdoor heat exchanger is connected with the second end of the indoor heat exchanger; 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 exhaust port, and the second connecting port is connected with the first port through a first pipeline; the heat accumulator comprises a first heat exchange tube and a second heat exchange tube, one end of the first heat exchange tube is connected with the third connecting port, and the first heat exchange tube is connected with the first pipeline in parallel; the third reversing piece comprises a first interface and a third interface, the first interface is selectively communicated with one of the second interface and the third interface, the first interface is connected with the third interface, the second interface is connected with the air inlet through a second pipeline, the third interface is connected with one end of the second heat exchange pipe, and the second heat exchange pipe is connected with the second pipeline in parallel.

According to the air conditioner provided by the technical scheme, when the condition that heat is required to be stored is judged, the first connecting port of the second reversing piece is controlled to be communicated with the third connecting port, so that a refrigerant flows through the first heat exchange tube to store heat. When heat storage is not needed, the first connecting port of the second reversing piece is controlled to be communicated with the second connecting port, the refrigerant does not flow through the first heat exchange tube, and the heat accumulator does not store heat. Therefore, the second reversing piece is arranged to control the first connecting port to be communicated with the second connecting port or the first connecting port to be communicated with the third connecting port, controllable heat storage is achieved, the working condition heat accumulator which does not need heat storage can not store heat, and energy loss of the system is reduced.

The refrigerant just flows through indoor heat exchanger after flowing through first heat exchange tube under the heat accumulation mode, therefore the refrigerant temperature of the first heat exchange tube of flowing through is higher, consequently, the heat accumulation of heat accumulator is fast, avoids having the not enough problem of heat accumulator heat accumulation, has reduced the time of defrosting, and makes the defrosting clean.

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 first throttling part connected in series between the second end of the indoor heat exchanger and the second end of the outdoor heat exchanger; and the bypass pipeline is connected with the first throttling component in parallel, and a first switch device for controlling the on-off of the bypass pipeline is arranged on the bypass pipeline.

And opening the first switching device, conducting the bypass pipeline, closing the first 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 first 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 comprises a cooling throttling component and a heating throttling component which are connected in series, the bypass pipeline is connected to two ends of the heating throttling component in parallel, the cooling throttling component is configured to throttle in a cooling mode, the heating mode is communicated in the 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 communicated in the 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.

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

In the case that the first throttling component comprises the throttling component body and the second 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.

In one embodiment, a second throttling component is connected in series between the third interface 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.

Further, the phase transition temperature of the heat storage material is less than or equal to 70 ℃, and the heat storage material comprises at least one of water, paraffin, ethylene glycol aqueous solution and disodium hydrogen phosphate dodecahydrate.

An aspect of a second aspect of the present invention provides a control method for 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, judging that heat storage is needed, controlling the first connector of the second reversing piece to be communicated with the third connector so as to enable a refrigerant to flow through the first heat exchange tube, and controlling the first connector of the third reversing piece to be communicated with the second connector so as to enter the heat storage mode.

According to the control method provided by the technical scheme of the second aspect of the invention, when heat storage is needed, the first connecting port of the second reversing piece is controlled to be communicated with the third connecting port, so that a refrigerant flows through the first heat exchange tube to store heat. When heat storage is not needed, the first connecting port of the second reversing piece is controlled to be communicated with the second connecting port, the refrigerant does not flow through the first heat exchange tube, and the heat accumulator does not store heat. Therefore, the second reversing piece is arranged to control the first connecting port to be communicated with the second connecting port or the first connecting port to be communicated with the third connecting port, controllable heat storage is achieved, the working condition heat accumulator which does not need heat storage can not store heat, and energy loss of the system is reduced.

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 temperature of the 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.

And judging whether the outdoor heat exchanger has the possibility of frosting or not according to the outdoor environment temperature, specifically, when the outdoor environment temperature is less than or equal to a first preset temperature, the possibility of frosting of the outdoor heat exchanger is indicated, at the moment, heat storage is judged to be needed, the first connecting port of the second reversing piece is controlled to be communicated with the third connecting port, so that the refrigerant flows through the first heat exchange tube, and the first connecting port of the third reversing piece is controlled to be communicated with the second connecting port, so that the heat storage mode is entered. When the outdoor environment temperature is higher than the first preset temperature, the frosting possibility of the outdoor heat exchanger is avoided, the heating mode is operated, the first connecting port of the second reversing piece is communicated with the second connecting port, the refrigerant does not flow through the first heat exchange tube, the first connecting port of the third reversing piece is communicated with the second connecting port, and the heat accumulator does not need to store heat.

Or judging whether the outdoor heat exchanger is frosted or not according to the coil temperature of the outdoor heat exchanger, specifically, when the coil temperature of the outdoor heat exchanger is less than or equal to a second preset temperature, which indicates that the outdoor heat exchanger is frosted, judging that heat storage is needed, controlling the first connector of the second reversing piece to be communicated with the third connector so that a refrigerant flows through the first heat exchange tube, and controlling the first connector of the third reversing piece to be communicated with the second connector so as to enter a heat storage mode. When the temperature of the coil of the outdoor heat exchanger is higher than the second preset temperature, the frosting possibility of the outdoor heat exchanger is avoided, the heating mode is operated, the first connecting port of the second reversing piece is communicated with the second connecting port, the refrigerant does not flow through the first heat exchange tube, the first connecting port of the third reversing piece is communicated with the second connecting port, and the heat accumulator does not need to store heat.

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

The first preset temperature is in a range of 2-10 ℃, and the condition that the frosting of the outdoor heat exchanger cannot be recognized timely due to the fact that the first preset temperature is lower than 2 ℃ and heat cannot be stored timely is avoided; it is also avoided that the first preset temperature is greater than 10 c so that the heat accumulator starts to accumulate heat already in case the outdoor heat exchanger is not frosted or frosting is slight.

The second preset temperature is 0 ℃, and the temperature of the coil of the outdoor heat exchanger is lower than 0 ℃, which indicates that the outdoor heat exchanger is frosted, and the heat accumulator needs to accumulate heat; the temperature of the coil of the outdoor heat exchanger is higher than 0 ℃, which indicates that the outdoor heat exchanger is not frosted, and the heat accumulator does not need to accumulate heat.

In one embodiment, after the heat storage mode is entered, the control method further includes: whether to maintain the heat accumulation mode is determined according to a change in current flowing through the outdoor fan.

After entering the heat storage mode, the frosting condition of the outdoor heat exchanger is further judged according to the change of the current flowing through the outdoor fan so as to determine whether the heat storage mode needs to be maintained, so that heat is stored under the condition that heat is required to be stored, and the heat storage mode is exited under the condition that heat is not required, so that the energy loss is reduced.

In one embodiment, the determining whether to maintain the heat accumulation mode according to a change in current flowing through the outdoor fan includes: recording the duration of starting up and heating; after the starting heating duration reaches a first duration, detecting the current flowing through the outdoor fan for N1 times at intervals of a first preset time interval, and obtaining an average value I1 of the current for N1 times; detecting the current flowing through the outdoor fan for N2 times at intervals of a second preset time after the current is detected for the second duration time for the last time, and obtaining an average value I2 of the current for N2 times; detecting the current flowing through the outdoor fan for N3 times at intervals of a third preset time after the current is detected for the third duration from the last time, and obtaining an average value I3 of the current for N3 times; the current flowing through the outdoor fan is alternating current, and if I1 is more than I2 and more than I3, the heat storage mode is maintained; the current flowing through the outdoor fan is direct current, and if I1 is greater than I2 is greater than I3, the heat storage mode is maintained.

And during starting heating, after the first duration, detecting the current flowing through the outdoor fan for N1 times at intervals of a first preset time interval, starting timing when the current for the N1 times is obtained, after the second duration, detecting the current flowing through the outdoor fan for N2 times at intervals of a second preset time interval, starting timing when the current for the N2 times is obtained, and after the second duration, detecting the current flowing through the outdoor fan for N3 times at intervals of a second preset time interval.

And comparing the size relations of I1, I2 and I3, and judging whether the outdoor heat exchanger is frosted or not according to the size relations.

The current flowing through the outdoor fan is alternating current, if I1 is greater than I2 and less than I3, the frosting of the outdoor heat exchanger is proved, the heat storage mode is maintained, the first connecting port and the third connecting port of the second reversing piece are controlled to be communicated, so that a refrigerant flows through the first heat exchange tube, and the first connecting port and the second connecting port of the third reversing piece are controlled to be communicated, so that the heat storage mode is started; if the condition that I1 is larger than I2 is smaller than I3 is not met, the outdoor heat exchanger is not frosted, the first connecting port of the second reversing piece is controlled to be communicated with the second connecting port, the refrigerant does not flow through the first heat exchange tube, and the heat accumulator does not store heat.

The current flowing through the outdoor fan is direct current, if I1 is greater than I2 is greater than I3, the frosting of the outdoor heat exchanger is indicated, the heat storage mode is maintained, the first connecting port and the third connecting port of the second reversing piece are controlled to be communicated, so that a refrigerant flows through the first heat exchange tube, and the first connecting port and the second connecting port of the third reversing piece are controlled to be communicated, so that the refrigerant enters the heat storage mode; if the condition that I1 is larger than I2 is smaller than I3 is not met, the outdoor heat exchanger is not frosted, the first connecting port of the second reversing piece is controlled to be communicated with the second connecting port, the refrigerant does not flow through the first heat exchange tube, and the heat accumulator does not store heat.

In one embodiment, the first duration ranges from 5min to 12min, the first preset time interval ranges from 10s to 30s, and N1 ranges from 2 to 5 times; the range of the second duration is 5min to 12min, the range of the second preset time interval is 10s to 30s, and the range of N2 is 2 to 5 times; the third duration is 5-12 min, the third preset time interval is 10-30 s, and the N3 is 2-5 times.

The first duration is 5-12 min, so that on one hand, stable operation of the air conditioning system is guaranteed, the detected current value is accurate, and on the other hand, frosting of the outdoor heat exchanger is avoided, or the frosting condition is not serious and defrosting is not needed. Further, the first duration may be, but is not limited to, 5min, 7min, 9min, or 12 min.

The range of the first preset time interval is 10 s-30 s, so that the detected I1 value is accurate, and the overlong time consumed for detecting N1 currents is avoided.

The range of N1 is 2 ~ 5 times, guarantees on the one hand that the I1 value that detects is accurate, and on the other hand avoids detecting N1 times electric current and consumes too long time.

The second duration is 5-12 min, so that the short interval time between the current detection and the current detection for N1 times is avoided to avoid the short interval time between I1 and I2, and the detection time for N2 times is avoided to avoid the short interval time to ensure that the outdoor heat exchanger does not frost or the frosting condition is not serious and does not need to be defrosted. Further, the second duration may be, but is not limited to, 5min, 7min, 9min, or 12 min.

The range of the second preset time interval is 10 s-30 s, so that the detected I2 value is accurate, and the overlong time consumed for detecting N2 currents is avoided.

The range of N2 is 2 ~ 5 times, guarantees on the one hand that the I2 value that detects is accurate, and on the other hand avoids detecting N2 times electric current and consumes too long time.

The third duration is 5-12 min, so that the short interval time between the current detection and the current detection for N2 times is avoided to avoid the short interval time between I2 and I3, and the detection time for N3 times is avoided to avoid the short interval time to ensure that the outdoor heat exchanger does not frost or the frosting condition is not serious and does not need to be defrosted. Further, the third duration may be, but is not limited to, 5min, 7min, 9min, or 12 min.

The range of the third preset time interval is 10-30 s, so that the detected I3 value is accurate, and the overlong time consumption for detecting N3 currents is avoided.

The range of N3 is 2 ~ 5 times, guarantees on the one hand that the I3 value that detects is accurate, and on the other hand avoids detecting N3 times electric current and consumes too long time.

In one embodiment, the control method comprises the following steps: and under the heating mode, the defrosting is judged to be needed, the first connecting port of the second reversing piece is controlled to be communicated with the second connecting port, and the first connecting port of the third reversing piece is controlled to be communicated with the third connecting port until the parameters of the air conditioner meet the preset conditions.

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 second connecting port, the first connecting port is communicated with the third connecting port, a refrigerant discharged from an exhaust port of the compressor passes through the first pipeline, the indoor heat exchanger and the outdoor 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, and the refrigerant evaporates and absorbs heat in the heat accumulator and flows back to an air inlet of the compressor.

In one embodiment, in the heating mode, it is determined that defrosting is required, the first connection port of the second direction-changing member is controlled to be communicated with the second connection port, and the first connection port of the third direction-changing member is controlled to be communicated with the third connection port, and the method further includes: and controlling the first switch device to be opened so as to conduct the bypass pipeline.

The first switch device is controlled to be opened, so that the bypass pipeline is conducted, the refrigerant does not flow through the first throttling part for throttling in the process that the refrigerant flows out from the second end of the indoor heat exchanger to the second end of the outdoor heat exchanger, but flows to the outdoor heat exchanger through the bypass pipeline, condensation is carried out in the outdoor heat exchanger, heat is released, and defrosting is achieved.

In one embodiment, the preset condition includes that the coil temperature of the outdoor heat exchanger is greater than a third preset temperature, or the coil temperature of the outdoor heat exchanger is greater than a fourth preset temperature within a preset time period, wherein the third preset temperature is greater than the fourth preset temperature.

The temperature of the coil of the outdoor heat exchanger is higher than a third preset temperature, which indicates that defrosting of the outdoor heat exchanger is completed, and the defrosting mode can be exited. Or the temperature of the coil of the outdoor heat exchanger is greater than a fourth lower preset temperature within a preset time, which also indicates that defrosting of the outdoor heat exchanger is completed, and the defrosting mode can be exited.

Whether defrosting is finished or not is judged according to the temperature of the coil of the outdoor heat exchanger, and the defrosting method is simple and reliable. It is understood that whether defrosting is finished or not may be judged by judging the discharge temperature of the compressor.

In one embodiment, the third preset temperature ranges from 6 ℃ to 12 ℃, the fourth preset temperature ranges from 3 ℃ to 8 ℃, and the preset time ranges from 20s to 60 s.

The third preset temperature is in the range of 6-12 ℃, the third preset temperature is prevented from being lower than 6 ℃, the defrosting effect of the outdoor heat exchanger is poor, and the energy waste of the system is also prevented because the third preset temperature is higher than 12 ℃, the defrosting mode is operated after the defrosting of the outdoor heat exchanger is finished, and the defrosting effect is avoided. The third preset temperature may be, but is not limited to, 6 ℃, 8 ℃, 10 ℃ or 12 ℃.

The range of the fourth preset temperature is 3-8 ℃, the fourth preset temperature is prevented from being lower than 3 ℃, the defrosting effect of the outdoor heat exchanger is poor, and the condition that the fourth preset temperature is higher than 8 ℃, the defrosting mode is operated after the defrosting of the outdoor heat exchanger is finished, and the energy waste of the system is caused is also avoided. The fourth preset temperature may be, but is not limited to, 3 ℃, 6 ℃, or 8 ℃.

The preset time is within the range of 20 s-60 s, the condition that the defrosting effect of the outdoor heat exchanger is poor due to the fact that the preset time is less than 20s is avoided, and the condition that the defrosting mode is operated after the defrosting of the outdoor heat exchanger is finished due to the fact that the preset time is more than 60s, and the energy waste of the system is caused. The preset time period may be, but is not limited to, 20s, 40s, or 60 s.

In one embodiment, the control method comprises the following steps: and under the heating mode, judging that defrosting and heat storage are not needed, controlling the first connecting port of the second reversing piece to be communicated with the second connecting port, controlling the first connecting port of the third reversing piece to be communicated with the second connecting port, and controlling the first switching device to be closed so as to disconnect the bypass pipeline.

In the heating mode, when defrosting and heat storage are not needed, the first connecting port is controlled to be communicated with the second connecting port, the first pipeline is conducted, a refrigerant flowing out of an exhaust port of the compressor flows through the first pipeline and does not pass through the first heat exchange tube, the heat accumulator does not store heat, the refrigerant flows into the indoor heat exchanger to be condensed and release heat after flowing out of the first pipeline, flows into the outdoor heat exchanger through the first throttling component to be evaporated, and flows back to the air inlet through the first connecting port and the second connecting port, and heating is achieved.

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

And under the refrigeration mode, the first connecting port is controlled to be communicated with the second connecting port, the first pipeline is conducted, the refrigerant flowing out of the exhaust port of the compressor flows through the first pipeline and does not pass through the first heat exchange tube, the heat accumulator does not store heat, the refrigerant flows into the outdoor heat exchanger to be condensed and release heat after flowing out of the first pipeline, flows into the indoor heat exchanger through the first throttling part to be evaporated, and flows back to the air inlet through the first connecting port and the second connecting port, so that refrigeration is realized.

A third aspect of the present invention provides a control device for an air conditioner, including a processor and a memory, wherein 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 a 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 stored thereon, characterized in that: the computer program, when executed by a processor, implements 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, wherein an arrow indicates a flow direction of a refrigerant in a cooling mode;

fig. 2 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, wherein an arrow indicates a flow direction of a refrigerant in a heating mode;

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

fig. 4 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention, wherein an arrow indicates a flow direction of a refrigerant in a defrosting mode;

FIG. 5 is a flow chart illustrating a control method according to an embodiment of the present invention;

FIG. 6 is a flow chart illustrating a control method according to an embodiment of the present invention;

FIG. 7 is a flow chart illustrating a control method according to an embodiment of the present invention;

fig. 8 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 8 is:

1 compressor, 11 exhaust port, 12 air inlet, 2 first reversing element, 21 first port, 22 second port, 23 third port, 24 fourth port, 3 outdoor heat exchanger, 4 first throttling element, 41 heating throttling element, 42 refrigerating throttling element, 5 bypass pipeline, 51 first switching device, 6 heat accumulator, 61 first heat exchange tube, 62 second heat exchange tube, 7 second reversing element, h first connecting port, j second connecting port, k third connecting port, 8 indoor heat exchanger, 9 third reversing element, e first connecting port, f second connecting port, g third connecting port, 10 first pipeline, 20 second pipeline, 30 second throttling element, 200 control device, 204 memory, 206 processor.

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 thereof, a control device 200, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 8 of the accompanying drawings.

As shown in fig. 1, an air conditioner according to some embodiments of the present invention includes a compressor 1, a first direction changing member 2, an outdoor heat exchanger 3, an indoor heat exchanger 8, a second direction changing member 7, and a third direction changing member 9.

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 communicates with the first port 21, and the other of the second and fourth ports 22 and 24 communicates with the third port 23. The second port 22 is connected to a first end of the outdoor heat exchanger 3, the fourth port 24 is connected to a first end of the indoor heat exchanger 8, and a second end of the outdoor heat exchanger 3 is connected to a second end of the indoor heat exchanger 8. The first direction changing member 2 may be a four-way valve.

The second reversing piece 7 comprises a first connecting port h to a third connecting port k, the first connecting port h is selectively communicated with one of a second connecting port j and the third connecting port k, the first connecting port h is connected with the exhaust port 11, and the second connecting port j is connected with the first port 21 through the first pipeline 10; the heat accumulator 6 comprises a first heat exchange tube 61 and a second heat exchange tube 62, one end of the first heat exchange tube 61 is connected with the third connecting port k, and the first heat exchange tube 61 is connected with the first pipeline 10 in parallel. The second direction changing part 7 may be a three-way valve, or the second direction changing part 7 includes a first valve and a second valve, the first valve is connected in series between the first port 21 and the exhaust port 11, the second valve is disposed on the first heat exchanging pipe 61, the first heat exchanging pipe 61 is connected in parallel with the first valve, one interface of the first valve forms a first connection port h, one interface of the second valve forms a third connection port k, and the other interface of the first valve and the other interface of the second valve form the first connection port h together.

The third reversing element 9 comprises a first port e to a third port g, the first port e is selectively communicated with one of a second port f and the third port g, the first port e is connected with the third port 23, the second port f is connected with the air inlet 12 through the second pipeline 20, the third port g is connected with one end of the second heat exchange pipe 62, and the second heat exchange pipe 62 is connected with the second pipeline 20 in parallel. The third direction-changing member 9 may be a three-way valve, or the second direction-changing member 7 includes a third valve and a fourth valve, the third valve is connected in series between the third port 23 and the gas inlet 12, the fourth valve is disposed on the second heat exchanging pipe 62, the second heat exchanging pipe 62 is connected in parallel with the third valve, one interface of the third valve forms a first interface e, one interface of the fourth valve forms a third interface g, and the other interface of the third valve and the other interface of the fourth valve form the first interface e together.

According to the air conditioner provided by the technical scheme of the invention, when the heat storage is needed, the first connecting port h of the second reversing piece 7 is controlled to be communicated with the third connecting port k, so that a refrigerant flows through the first heat exchange tube 61 to store heat. When heat accumulation is not needed, the first connecting port h of the second reversing piece 7 is controlled to be communicated with the second connecting port j, the refrigerant does not flow through the first heat exchange tube 61, and the heat accumulator 6 does not accumulate heat. Therefore, the second reversing piece 7 is arranged to control the first connecting port h to be communicated with the second connecting port j or the first connecting port h to be communicated with the third connecting port k, controllable heat storage is achieved, the working condition heat accumulator 6 which does not need heat storage can not store heat, and energy loss of the system is reduced.

In the heat storage mode, the refrigerant flows through the indoor heat exchanger 8 after flowing through the first heat exchange tube 61, so that the temperature of the refrigerant flowing through the first heat exchange tube 61 is high, the heat storage speed of the heat accumulator 6 is high, the problem that the heat storage of the heat accumulator 6 is insufficient is solved, the defrosting time is shortened, and defrosting is clean.

In one embodiment, an air conditioner includes: a first throttling element 4 and a bypass line 5.

The first throttling part 4 is connected in series between the second end of the indoor heat exchanger 8 and the second end of the outdoor heat exchanger 3.

The bypass pipeline 5 is connected in parallel with the first throttling component 4, and the bypass pipeline 5 is provided with a first switch device 51 for controlling the on-off of the bypass pipeline 5.

The first switching device 51 is turned on to turn on the bypass line 5, and the first switching device 51 is turned off to turn off the bypass line 5. The bypass pipeline 5 and the first switch device 51 are arranged to enable the refrigerant to selectively flow through the first throttling component 4, so as to control the heat exchange condition (whether condensation or evaporation) of the refrigerant in the outdoor heat exchanger 3. Specifically, in the cooling mode, as shown in fig. 1, the first switching device 51 is closed, the bypass line 5 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 first switching device 51 is closed, the bypass line 5 is disconnected, 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 66 accumulates heat, the first switching device 51 is closed, the bypass line 5 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 first switching device 51 is turned on, the bypass line 5 is conducted, and the refrigerant flows through the bypass line 5 and is condensed in the outdoor heat exchanger 3 to defrost.

The first switching device 51 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 part 4 comprises a cooling throttling part 42 and a heating throttling part 41 which are connected in series, the bypass pipeline 5 is connected with two ends of the heating throttling part 41 in parallel, the cooling throttling part 42 is configured to throttle in a cooling mode, the heating mode is communicated in the direction from the second end of the indoor heat exchanger 8 to the second end of the outdoor heat exchanger 3, the heating throttling part 41 is configured to throttle in a heating mode, and the cooling mode is communicated in the direction from the second end of the outdoor heat exchanger 3 to the second end of the indoor heat exchanger 8.

In the defrosting mode, the first switch device 51 is controlled to be opened, the bypass pipeline 5 is conducted, the refrigerant flows out from the second end of the indoor heat exchanger 8, then flows through the refrigeration throttling component 42 and the bypass pipeline 5 and enters the outdoor heat exchanger 3, and the refrigeration throttling component 42 does not have a throttling effect on the refrigerant, so that the refrigerant flowing out from the second end of the indoor heat exchanger 8 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 8, and is fully conducted in the direction from the second end of the indoor heat exchanger 8 to the second end of the outdoor heat exchanger 3 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 8 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 8 in the cooling mode, and does not have a throttling effect. The cooling throttle member 42 and the heating throttle member 41 may be one-way throttle valves.

It is understood that the bypass line 5 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 5 as a whole.

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

And the on-off control of the pipeline where the throttling component body is located is realized by opening or closing the second switch device. In the defrosting mode, the second switch device is controlled to be closed, the first switch device 51 is controlled to be opened, the refrigerant enters the outdoor heat exchanger 3 through the bypass pipeline 5, and the refrigerant flowing out of the second end of the indoor heat exchanger 8 does not throttle in the process of flowing into the outdoor heat exchanger 3, so that the refrigerant is condensed in the outdoor heat exchanger 3 to release heat, and defrosting is performed on the outdoor heat exchanger 3. The second switch device can be an electromagnetic valve which can be a one-way electromagnetic valve or a two-way electromagnetic valve, and the throttling component body can be an electronic expansion valve, a two-way throttle valve, a capillary tube or a thermal expansion valve.

In one embodiment, a second throttling element 30 is connected in series between the third port g and one end of the second heat exchange pipe 62.

And in the defrosting mode, the first interface e is controlled to be communicated with the third interface g, and the refrigerant flowing out of the outdoor heat exchanger 3 enters the second heat exchange tube 62 through the first interface e, the third interface g and the second throttling component 30 after passing through the first reversing piece 2. The second throttling part 30 throttles the refrigerant so that the refrigerant can be evaporated in the second heat exchanging pipe 62 and then flows back to the air inlet 12 of the compressor 1.

The second throttling part 30 may be a capillary tube, an electronic expansion valve, a thermal expansion valve, or a throttle valve.

In one of the embodiments, the heat accumulator 6 includes a heat storage cavity in which at least part of the first heat exchange tube 61 and the second heat exchange tube 62 is located, and the heat storage cavity is filled with a heat storage material including a phase change material.

At least parts of the first heat exchange tube 61 and the second heat exchange tube 62 are arranged in a heat storage cavity of the heat accumulator 6, so that the first heat exchanger and the second heat exchanger can be protected to a certain extent, and the heat accumulator 6 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 6 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 6 by arranging a certain amount of phase-change materials in the heat accumulator 6, and the phase-change materials change in shape and release heat to accelerate defrosting in the defrosting process.

Furthermore, the phase transition temperature of the heat storage material is less than or equal to 70 ℃, and the heat storage material comprises at least one of water, paraffin, ethylene glycol aqueous solution and disodium hydrogen phosphate dodecahydrate.

As shown in fig. 1 to 4, the air conditioner includes a compressor 1, a four-way valve (first direction changer 2), an outdoor heat exchanger 3, a heating throttle valve, a cooling throttle valve, an indoor heat exchanger 8, an electromagnetic valve (first switching device 51) connected in parallel with the heating throttle valve, and a heat accumulator 6. The parts are connected by pipelines. The first heat exchange pipe 61 is connected in parallel to a pipe between the compressor 1 and the indoor heat exchanger 8, and the second heat exchange pipe 62 is connected in parallel to an intake pipe (second pipe 20) of the compressor 1 through a three-way valve (third direction changing member 9). The flow path of the refrigerant in the cooling, heating, heat storage and defrosting modes will be described in detail with reference to fig. 1 to 4.

The refrigerant flow in the cooling mode is as shown in fig. 1, the compressor 1 compresses the refrigerant into high-temperature and high-pressure gas, the refrigerant is connected to the outdoor heat exchanger 3 through the hj connector (h is the first connector h, j is the second connector j) of the second reversing element 7 and the ab port (a is the first port 21, b is the second port 22) of the four-way valve 7 to be condensed into medium-temperature and high-pressure liquid refrigerant, the refrigerant is throttled to the indoor heat exchanger 8 through the refrigeration throttle valve to evaporate and absorb heat, and then the refrigerant is connected to the third reversing element 9 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 ef port (e is the first port e, f is the second port f) of the third reversing element 9, wherein the third reversing element 9 is a three-way valve, the ef port (e is the first port e, f is the second port f) is communicated when the third reversing element 9 is set to 0 step, the, g is the third port g). The second direction changing member 7 is a three-way valve, and the hj connectors (h is the first connector h, j is the second connector j) are communicated when the second direction changing member 7 is set to 0 step, and the hk connectors (h is the first connector h, k is the third connector k) are communicated when the second direction changing member 7 is set to 608 steps.

In the heating mode, as shown in fig. 2, the refrigerant flow is compressed into high-temperature and high-pressure gas by the compressor 1, the high-temperature and high-pressure gas is condensed into medium-temperature and high-pressure liquid by passing through the hj connector (h is the first connector h, j is the second connector j) of the second reversing element 7 and the ac port (a is the first port 21, c is the fourth port 24) of the four-way valve 7 to the indoor heat exchanger 8, passes through the heating throttle valve to the outdoor heat exchanger 3 to absorb heat, and finally returns to the compressor 1 by passing through the bd port (b is the second port 22, d is the third port 23) of the four-way valve and the ef port (e is the first port e, f is the second port f) of the third.

The refrigerant flow during heat storage is as shown in fig. 3, the compressor 1 compresses the refrigerant into high-temperature and high-pressure gas, the high-temperature and high-pressure gas heats the heat accumulator 6 through the hk connector (h is the first connector h, k is the third connector k) of the second reversing element 7, enters the indoor heat exchanger 8 through the ac port (a is the first port 21, c is the fourth port 24) of the four-way valve 7 for cooling, passes through the heating throttle valve to the outdoor heat exchanger 3 for absorbing heat, and finally returns to the compressor 1 through the bd port (b is the second port 22, d is the third port 23) of the four-way valve and the ef port (e is the first port e, f is the second port f) of the third reversing element 9.

In defrosting, the refrigerant flow is as shown in fig. 4, the compressor 1 condenses the high-temperature and high-pressure gas of the refrigerant compressor 1 to the indoor heat exchanger 8 through the hj connector (h is the first connector h, j is the second connector j) of the second reversing element 7 and through the ac port (a is the first port 21, c is the fourth port 24) of the four-way valve 7 to obtain medium-temperature and high-pressure liquid, the medium-temperature and high-pressure liquid passes through the first switching device 51 and then to the outdoor heat exchanger 3 to release heat, the outdoor heat exchanger 3 is defrosted, the medium-temperature and high-pressure liquid passes through the bd port (b is the second port 22, d is the third port 23) of the four-way valve and the eg port (e is the first port e, g is the third port g) of the third reversing element 9, and the medium-temperature and high-pressure.

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. 5, the control method includes:

step S50, in the heating mode, determining that heat storage is required, controlling the first connection h of the second reversing element 7 to communicate with the third connection k, so that the refrigerant flows through the first heat exchange tube 61, and controlling the first connection e of the third reversing element 9 to communicate with the second connection f, so as to enter the heat storage mode.

In the control method provided by the technical scheme of the second aspect of the invention, when the heat storage is determined to be needed, the first connection port h of the second reversing piece 7 is controlled to be communicated with the third connection port k, so that the refrigerant flows through the first heat exchange tube 61 to store the heat. When heat accumulation is not needed, the first connecting port h of the second reversing piece 7 is controlled to be communicated with the second connecting port j, the refrigerant does not flow through the first heat exchange tube 61, and the heat accumulator 6 does not accumulate heat. Therefore, the second reversing piece 7 is arranged to control the first connecting port h to be communicated with the second connecting port j or the first connecting port h to be communicated with the third connecting port k, controllable heat storage is achieved, the working condition heat accumulator 6 which does not need heat storage can not store heat, and energy loss of the system is reduced.

Example two:

as shown in fig. 6, the control method includes:

step S602, detecting a starting mode, wherein the starting mode comprises a refrigeration mode or a heating mode;

step S604, judging whether heat storage is needed or not in a heating mode;

if the heat storage is needed, executing step S606, controlling the first connection port h of the second reversing element 7 to be communicated with the third connection port k, so that the refrigerant flows through the first heat exchange tube 61, and controlling the first connection port e of the third reversing element 9 to be communicated with the second connection port f, so as to enter a heat storage mode;

if the heat storage is not needed, executing step S608, controlling the air conditioner to enter a heating mode, controlling the first connection port h of the second reversing element 7 to be communicated with the second connection port j, controlling the first connection port e of the third reversing element 9 to be communicated with the third connection port g, and controlling the first switching device 51 to be disconnected;

step S610, determining whether to maintain the heat storage mode according to a change in the current flowing through the outdoor fan.

After entering the heat storage mode, the frosting condition of the outdoor heat exchanger 3 is further judged according to the change of the current flowing through the outdoor fan so as to determine whether the heat storage mode needs to be maintained, so that heat is stored under the condition that heat is required, and the heat storage mode is exited under the condition that heat is not required, so that energy loss is reduced.

In one specific embodiment, the step S604 of determining whether heat storage is required 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, controlling the first connector h of the second reversing piece 7 to be communicated with the third connector k so as to enable a refrigerant to flow through the first heat exchange tube 61, and controlling the first connector e of the third reversing piece 9 to be communicated with the second connector f so as to enter a heat storage mode;

if not, the heat storage is not needed.

Judging whether the outdoor heat exchanger 3 is frosted or not according to the outdoor environment temperature, specifically, when the outdoor environment temperature is less than or equal to a first preset temperature, which indicates that the outdoor heat exchanger 3 is frosted, judging that heat storage is needed at the moment, controlling the first connection port h of the second reversing piece 7 to be communicated with the third connection port k so that a refrigerant flows through the first heat exchange tube 61, and controlling the first connection port e of the third reversing piece 9 to be communicated with the second connection port f so as to enter a heat storage mode. When the outdoor environment temperature is higher than the first preset temperature, the possibility that the outdoor heat exchanger 3 frosts does not exist is shown, the heating mode is operated, the first connecting port h of the second reversing piece 7 is communicated with the second connecting port j, the refrigerant does not flow through the first heat exchange tube 61, the first connecting port e of the third reversing piece 9 is communicated with the second connecting port f, and the heat accumulator 6 does not need to accumulate heat.

In another specific embodiment, the step S604 of determining whether heat storage is required specifically includes:

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 not, judging that heat storage is not needed, and entering a heating mode.

Judging whether the outdoor heat exchanger 3 is likely to frost or not according to the coil temperature of the outdoor heat exchanger 3, specifically, when the coil temperature of the outdoor heat exchanger 3 is less than or equal to a second preset temperature, which indicates that the outdoor heat exchanger 3 is likely to frost, judging that heat storage is required, controlling the first connector h of the second reversing piece 7 to be communicated with the third connector k so that a refrigerant flows through the first heat exchange tube 61, and controlling the first connector e of the third reversing piece 9 to be communicated with the second connector f so as to enter a heat storage mode. When the temperature of the coil of the outdoor heat exchanger 3 is higher than the second preset temperature, which indicates that the outdoor heat exchanger 3 does not have the possibility of frosting, the heating mode is operated, the first connection port h of the second reversing piece 7 is communicated with the second connection port j, the refrigerant does not flow through the first heat exchange tube 61, the first connection port e of the third reversing piece 9 is communicated with the second connection port f, and the heat accumulator 6 does not need to accumulate heat.

In one embodiment, the first predetermined temperature is in the range of 2 ℃ to 10 ℃; the second predetermined temperature is 0 ℃.

The first preset temperature is in the range of 2-10 ℃, and the condition that the frosted outdoor heat exchanger 3 cannot be recognized timely due to the fact that the first preset temperature is lower than 2 ℃ and heat cannot be stored timely is avoided; it is also avoided that the first preset temperature is greater than 10 c so that the heat accumulator 6 already starts to accumulate heat in case the outdoor heat exchanger 3 is not frosted or frosted slightly.

The second preset temperature is 0 ℃, and the temperature of the coil of the outdoor heat exchanger 3 is lower than 0 ℃, which indicates that the outdoor heat exchanger 3 is frosted, and the heat accumulator 6 needs to accumulate heat; the temperature of the coil of the outdoor heat exchanger 3 is higher than 0 ℃, which indicates that the outdoor heat exchanger 3 is not frosted, and the heat accumulator 6 does not need to accumulate heat.

In one embodiment, the step S606 determines whether to maintain the heat storage mode according to a change in current flowing through the outdoor fan, and specifically includes:

step S6102, recording the duration of the startup heating;

step S6104, after the duration of the heating after starting up reaches the first duration, detecting the current flowing through the outdoor fan for N1 times at intervals of a first preset time interval, and obtaining an average value I1 of the current for N1 times;

step S6106, after the second duration time from the last current detection, detecting the current flowing through the outdoor fan for N2 times at intervals of a second preset time interval, and obtaining an average value I2 of the current for N2 times;

step S6108, after the current is detected for the third duration from the last time, detecting the current flowing through the outdoor fan for N3 times at intervals of a third preset time interval, and obtaining an average value I3 of the current for N3 times;

if the current flowing through the outdoor fan is AC, step S6110, determine if I1 < I2 < I3 is true,

if yes, step S6112 is executed to maintain the heat storage mode;

if the connection is not established, the step S6114 is executed to exit the heat storage mode, heating is continued, the first interface h of the second reversing member 7 is communicated with the second interface j, the switch device is turned off, and the first interface e of the third reversing member 9 is communicated with the second interface f.

If the current flowing through the outdoor fan is direct current, step S6110 is to determine whether I1 > I2 > I3 is true;

if yes, maintaining the heat storage mode;

if the heat storage mode is not established, the heat storage mode is exited, heating is continued, the first connector h and the second connector j of the second reversing piece 7 are communicated, the switch device is closed, and the first connector e and the second connector f of the third reversing piece 9 are communicated.

And comparing the size relations of I1, I2 and I3, and judging whether the outdoor heat exchanger 3 frosts or not according to the size relations.

The current flowing through the outdoor fan is alternating current, if I1 is greater than I2 and less than I3, the frosting of the outdoor heat exchanger 3 is proved, the heat storage mode is maintained, the first connection port h of the second reversing piece 7 is controlled to be communicated with the third connection port k, so that the refrigerant flows through the first heat exchange tube 61, and the first connection port e of the third reversing piece 9 is controlled to be communicated with the second connection port f, so that the refrigerant enters the heat storage mode; if the condition that I1 < I2 < I3 is not met indicates that the outdoor heat exchanger 3 does not frost, the first connecting port h of the second reversing piece 7 is controlled to be communicated with the second connecting port j, the refrigerant does not flow through the first heat exchange tube 61, and the heat accumulator 6 does not accumulate heat.

The current flowing through the outdoor fan is direct current, if I1 is greater than I2 is greater than I3, the frosting of the outdoor heat exchanger 3 is proved, the heat storage mode is maintained, the first connection port h of the second reversing piece 7 is controlled to be communicated with the third connection port k, so that the refrigerant flows through the first heat exchange tube 61, and the first connection port e of the third reversing piece 9 is controlled to be communicated with the second connection port f, so that the refrigerant enters the heat storage mode; if the condition that I1 < I2 < I3 is not met indicates that the outdoor heat exchanger 3 does not frost, the first connecting port h of the second reversing piece 7 is controlled to be communicated with the second connecting port j, the refrigerant does not flow through the first heat exchange tube 61, and the heat accumulator 6 does not accumulate heat.

In one embodiment, the first duration is in a range of 5min to 12min, the first preset time interval is in a range of 10s to 30s, and the N1 is in a range of 2 to 5 times; the second duration is 5-12 min, the second preset time interval is 10-30 s, and the N2 is 2-5 times; the third duration is 5-12 min, the third preset time interval is 10-30 s, and the N3 is 2-5 times.

The first duration is 5-12 min, so that on one hand, stable operation of the air conditioning system is guaranteed, the detected current value is accurate, and on the other hand, frosting of the outdoor heat exchanger 3 is not generated or the frosting condition is not serious, and defrosting is not needed. Further, the first duration may be, but is not limited to, 5min, 7min, 9min, or 12 min.

The second duration is 5-12 min, so that the short interval time between the current detection and the current detection for N1 times is avoided to avoid the short interval time between I1 and I2, and the detection time for N2 times is avoided to avoid the short interval time to ensure that the outdoor heat exchanger 3 is not frosted or the frosting condition is not serious and defrosting is not needed. Further, the second duration may be, but is not limited to, 5min, 7min, 9min, or 12 min.

The third duration is 5-12 min, so that the short interval time between the current detection and the current detection for N2 times is avoided to avoid the short interval time between I2 and I3, and the detection time for N3 times is avoided to avoid the short interval time to ensure that the outdoor heat exchanger 3 is not frosted or the frosting condition is not serious and defrosting is not needed. Further, the third duration may be, but is not limited to, 5min, 7min, 9min, or 12 min.

In one embodiment, the control method comprises the following steps:

step S612, judging whether defrosting is needed or not in a heating mode;

step S614, in the heating mode, the defrosting is judged to be needed, the first connector h of the second reversing piece 7 is controlled to be communicated with the second connector j, and the first connector e of the third reversing piece 9 is controlled to be communicated with the third connector g;

if yes, returning to the step S6112;

step S616, judging whether the parameters of the air conditioner meet preset conditions or not;

if yes, executing step S618, exiting the defrosting mode, operating the heating mode, communicating the first interface h of the second reversing piece 7 with the second interface j, closing the switch device, and communicating the first interface e of the third reversing piece 9 with the second interface f;

if not, the process returns to the step S614 to continue defrosting.

And in the heating mode, when the defrosting is needed, entering a defrosting mode. In the defrosting mode, the first connection port h is communicated with the second connection port j, 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 passes through the first pipeline 10, the indoor heat exchanger 8 and the outdoor heat exchanger 3, the refrigerant releases heat in the outdoor heat exchanger 3 to defrost, the refrigerant flows into the second heat exchange tube 62 through the first connection port e and the third connection port g after defrosting, and the refrigerant evaporates and absorbs heat in the heat accumulator 6 and flows back to the air inlet 12 of the compressor 1.

Whether defrosting is needed or not can be judged by detecting the temperature of the coil pipe of the outdoor heat exchanger 3, the outdoor environment temperature, the heating operation time of the air conditioner and the like.

In one embodiment, in the heating mode of step S614, it is determined that defrosting is required, the first connection port h of the second direction-changing member 7 is controlled to be communicated with the second connection port j, and the first connection port e of the third direction-changing member 9 is controlled to be communicated with the third connection port g, and the method further includes: the first switching device 51 is controlled to open to conduct the bypass line 5.

The first switch device 51 is controlled to be opened, so that the bypass pipeline 5 is conducted, in the process that the refrigerant flows out from the second end of the indoor heat exchanger 8 to the second end of the outdoor heat exchanger 3, the refrigerant is not throttled by the first throttling component 4, but the refrigerant flowing out from the second end of the indoor heat exchanger 8 flows to the outdoor heat exchanger 3 through the bypass pipeline 5, condensation and heat release are carried out in the outdoor heat exchanger 3, and defrosting is achieved.

In one embodiment, the preset condition in step S616 includes that the coil temperature of the outdoor heat exchanger 3 is greater than a third preset temperature, or the coil temperature of the outdoor heat exchanger 3 is greater than a fourth preset temperature within a preset time period, where the third preset temperature is greater than the fourth preset temperature.

The temperature of the coil of the outdoor heat exchanger 3 is higher than a third preset temperature, which indicates that the defrosting of the outdoor heat exchanger 3 is completed, and the defrosting mode can be exited. Or the temperature of the coil of the outdoor heat exchanger 3 is greater than the fourth lower preset temperature within the preset time, which also indicates that defrosting of the outdoor heat exchanger 3 is completed, and the defrosting mode can be exited.

Whether defrosting is finished or not is judged according to the temperature of the coil of the outdoor heat exchanger 3, and the defrosting method is simple and reliable. It is understood that whether defrosting is finished may be determined by determining the discharge temperature of the compressor 1.

In one embodiment, the third predetermined temperature is in a range of 6-12 deg.C, the fourth predetermined temperature is in a range of 3-8 deg.C, and the predetermined time period is in a range of 20-60 s.

The third preset temperature is in the range of 6-12 ℃, the third preset temperature is prevented from being lower than 6 ℃, the defrosting effect of the outdoor heat exchanger 3 is poor, and the third preset temperature is also prevented from being higher than 12 ℃, so that the outdoor heat exchanger 3 still operates in a defrosting mode after defrosting is finished, and the energy waste of the system is caused. The third preset temperature may be, but is not limited to, 6 ℃, 8 ℃, 10 ℃ or 12 ℃.

The fourth preset temperature is in a range of 3-8 ℃, the fourth preset temperature is prevented from being lower than 3 ℃, the defrosting effect of the outdoor heat exchanger 3 is poor, and the fourth preset temperature is also prevented from being higher than 8 ℃, so that the outdoor heat exchanger 3 still operates in a defrosting mode after defrosting is finished, and the energy waste of the system is caused. The fourth preset temperature may be, but is not limited to, 3 ℃, 6 ℃, or 8 ℃.

The preset time is within the range of 20 s-60 s, the condition that the defrosting effect of the outdoor heat exchanger 3 is poor due to the fact that the preset time is less than 20s is avoided, and the condition that the defrosting mode is operated after the defrosting of the outdoor heat exchanger 3 is finished due to the fact that the preset time is more than 60s is also avoided, and the energy waste of the system is caused. The preset time period may be, but is not limited to, 20s, 40s, or 60 s.

In one embodiment, the control method comprises the following steps: in the heating mode, it is determined that defrosting and heat storage are not required, the first connection port h of the second reversing member 7 is controlled to be communicated with the second connection port j, the first connection port e of the third reversing member 9 is controlled to be communicated with the second connection port f, and the first switching device 51 is controlled to be closed, so that the bypass pipeline 5 is disconnected.

In the heating mode, when defrosting and heat storage are not needed, the first connecting port h is controlled to be communicated with the second connecting port j, the first pipeline 10 is conducted, a refrigerant flowing out of the exhaust port 11 of the compressor 1 flows through the first pipeline 10 and does not pass through the first heat exchange tube 61, the heat accumulator 6 does not store heat, after flowing out of the first pipeline 10, the refrigerant enters the indoor heat exchanger 8 to be condensed and release heat, flows into the outdoor heat exchanger 3 through the first throttling part 4 to be evaporated, and flows back to the air inlet 12 through the first connecting port e and the second connecting port f, and heating is achieved.

In one embodiment, the third direction-changing element 9 is a second three-way valve, and the third direction-changing element 9 is set to communicate with the ef port (e is the first port e, f is the second port f) at step 0, and communicate with the eg port (e is the first port e, g is the third port g) at step 608. The second reversing piece 7 is a first three-way valve, the hj connectors (h is a first connector h, j is a second connector j) are communicated when the second reversing piece 7 is set to be in a 0-step state, and the hk connectors (h is a first connector h, k is a third connector k) are communicated when the second reversing piece 7 is set to be in a 608-step state, and the control method comprises the following steps: steps S702-S.

Step S620, in the cooling mode, the first connection port h of the second direction-changing member 7 is controlled to be communicated with the second connection port j, the first connection port e of the third direction-changing member 9 is controlled to be communicated with the second connection port f, and the first switch device 51 is controlled to be closed, so that the bypass pipeline 5 is disconnected.

In a refrigeration mode, the first connection port h is controlled to be communicated with the second connection port j, the first pipeline 10 is conducted, a refrigerant flowing out of the exhaust port 11 of the compressor 1 flows through the first pipeline 10 and does not pass through the first heat exchange tube 61, the heat accumulator 6 does not accumulate heat, after flowing out of the first pipeline 10, the refrigerant enters the outdoor heat exchanger 3 to be condensed and release heat, flows into the indoor heat exchanger 8 through the first throttling part 4 to be evaporated, and flows back to the air inlet 12 through the first connection port e and the second connection port f, and refrigeration is achieved.

In a specific embodiment, as shown in fig. 7, the second direction-changing member 7 is a three-way valve, and the control method includes steps S702 to S730.

Step S702, detecting a starting mode;

step S730, if the refrigeration mode is adopted, the three-way valve is set to 0 step, at this time, the first heat exchange tube 61 is disconnected, no high-temperature and high-pressure refrigerant passes through, and no heat is stored;

if the heating mode is selected, step S704 is executed to detect the outdoor environment temperature T4, and determine whether the outdoor environment temperature T4 is equal to or less than T (a first preset temperature), for example, T may be 7 ℃;

if yes, indicating that the outdoor heat exchanger 3 is likely to be frosted, executing step S706, setting the three-way valve to 608 steps, and starting to store heat in the heat accumulator 6;

if not, indicating that no risk of frosting exists before the outdoor air enters, and no heat storage is needed, executing a step S726, and controlling the three-way valve to be in a 0 step;

after the operation time t (the first duration), step S708 is executed, the outdoor fan current is detected once every time t1 (the first preset time interval), N (N1) times are detected, and the average value is I1, for example, t may be 5min, t1 may be 20S, and N may be 3 times;

after the operation time t (the second duration), step S710 is executed, the outdoor fan current is detected once every time t1 (the second preset time interval), N (N2) times are detected in total, the average value is I2, for example, t may be 5min, t1 may be 20S, and N may be 3 times;

after the operation time t (the third duration), step S712 is executed, the outdoor fan current is detected once every time t1 (the third preset time interval), N (N3) times are detected, and the average value is I3, for example, t may be 5min, t1 may be 20S, and N may be 3 times;

when the outdoor fan is an alternating current motor, executing step S714, and detecting whether I1 is greater than I2 and I3 is true;

if yes, the outdoor heat exchanger 3 is frosted, step S716 is executed, the three-way valve is controlled to be set 608, and the heat accumulator 6 accumulates heat;

if the condition is not met, the outdoor heat exchanger 3 is not frosted and does not need to be defrosted, step S728 is executed, the three-way valve is controlled to be set to 0 step, and the heat accumulator 6 does not accumulate heat;

if the outdoor fan is a direct current motor, step S714 is to detect whether I1 > I2 > I3 is satisfied;

if not, the outdoor heat exchanger 3 is frosted, and defrosting is not needed, the step S728 is executed, the three-way valve is controlled to be set to be 0, and the heat accumulator 6 does not accumulate heat;

step S718, detecting whether defrosting is needed;

if yes, executing step S720 to enter into a defrosting mode;

if it is determined that defrosting is not required, returning to step S716;

step S722, detecting whether the coil temperature T5 of the real-time outdoor heat exchanger 3 is greater than or equal to T50 (third preset temperature) or T5 is greater than or equal to T51 (fourth preset temperature) for T3 (preset duration), where T50 may be 8 ℃, T51 may be 6 ℃, and T3 may be 40S;

if yes, executing step S724 to exit the defrosting mode, and executing heating;

if not, the process returns to step S720 to continue defrosting.

As shown in fig. 8, 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

1. An air conditioner, comprising:

a compressor including an exhaust port and an intake port;

a first reversing part comprising first to fourth ports, one of the second and fourth ports being in communication with the first port, the other of the second and fourth ports being in communication with the third port;

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

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 exhaust port, and the second connecting port is connected with the first port through a first pipeline;

the heat accumulator comprises a first heat exchange tube and a second heat exchange tube, one end of the first heat exchange tube is connected with the third connecting port, and the first heat exchange tube is connected with the first pipeline in parallel;

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

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

a first throttling part connected in series between the second end of the indoor heat exchanger and the second end of the outdoor heat exchanger;

and the bypass pipeline is connected with the first throttling component in parallel, and a first 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 bypass pipeline is connected to two ends of the heating throttling component in parallel, or the whole of the refrigerating throttling component and the heating throttling component is connected to 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 second switching device connected with the throttling component body in series, and the second 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 any one of claims 1 to 4,

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

6. The air conditioner according to any one of claims 1 to 4,

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.

7. A control method of an air conditioner for controlling the air conditioner according to any one of claims 1 to 6, characterized by comprising:

and under the heating mode, judging that heat storage is needed, controlling the first connector of the second reversing piece to be communicated with the third connector so as to enable the refrigerant to flow through the first heat exchange tube, and controlling the first connector of the third reversing piece to be communicated with the second connector so as to enter the heat storage mode.

8. The control method according to claim 7, wherein the determination 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.

9. The control method according to claim 8,

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

10. The control method according to claim 7, further comprising, after the entering of the heat storage mode:

whether to maintain the heat accumulation mode is determined according to a change in current flowing through the outdoor fan.

11. The control method according to claim 10, wherein the determining whether to maintain the heat accumulation mode according to a change in current flowing through the outdoor fan includes:

recording the duration of starting up and heating;

after the starting heating duration reaches a first duration, detecting the current flowing through the outdoor fan for N1 times at intervals of a first preset time interval, and obtaining an average value I1 of the current for N1 times;

detecting the current flowing through the outdoor fan for N2 times at intervals of a second preset time after the current is detected for the second duration time for the last time, and obtaining an average value I2 of the current for N2 times;

detecting the current flowing through the outdoor fan for N3 times at intervals of a third preset time after the current is detected for the third duration from the last time, and obtaining an average value I3 of the current for N3 times;

the current flowing through the outdoor fan is alternating current, and if I1 is more than I2 and more than I3, the heat storage mode is maintained;

the current flowing through the outdoor fan is direct current, and if I1 is greater than I2 is greater than I3, the heat storage mode is maintained.

12. The control method according to claim 11,

the first duration is 5-12 min, the first preset time interval is 10-30 s, and the N1 is 2-5 times;

the range of the second duration is 5min to 12min, the range of the second preset time interval is 10s to 30s, and the range of N2 is 2 to 5 times;

the third duration is 5-12 min, the third preset time interval is 10-30 s, and the N3 is 2-5 times.

13. The control method according to any one of claims 7 to 12, characterized by comprising:

and under the heating mode, the defrosting is judged to be needed, the first connecting port of the second reversing piece is controlled to be communicated with the second connecting port, and the first connecting port of the third reversing piece is controlled to be communicated with the third connecting port until the parameters of the air conditioner meet the preset conditions.

14. The control method according to claim 13, wherein in the heating mode, it is determined that defrosting is required, the first connection port of the second direction-changing member is controlled to communicate with the second connection port, and the first connection port of the third direction-changing member is controlled to communicate with the third connection port, further comprising:

and controlling the first switch device to be opened so as to conduct the bypass pipeline.

15. The control method of claim 13, wherein the preset condition comprises a coil temperature of the outdoor heat exchanger being greater than a third preset temperature, or the coil temperature of the outdoor heat exchanger being greater than a fourth preset temperature for a preset duration, wherein the third preset temperature is greater than the fourth preset temperature.

16. The control method according to claim 15,

the range of the third preset temperature is 6-12 ℃, the range of the fourth preset temperature is 3-8 ℃, and the range of the preset time is 20-60 s.

17. The control method according to any one of claims 7 to 12, characterized by comprising:

and under the heating mode, judging that defrosting and heat storage are not needed, controlling the first connecting port of the second reversing piece to be communicated with the second connecting port, controlling the first connecting port of the third reversing piece to be communicated with the second connecting port, and controlling the first switching device to be closed so as to disconnect the bypass pipeline.

18. The control method according to any one of claims 7 to 12, characterized by comprising:

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

19. 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 7 to 18 when executing a computer program stored in the memory.

20. An air conditioner, comprising: the control device of an air conditioner according to claim 19.

21. 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 the control method of the air conditioner as set forth in any one of claims 7 to 18.