CN105588220A - Outdoor unit, air conditioning system and defrosting method of air conditioning system - Google Patents
Outdoor unit, air conditioning system and defrosting method of air conditioning system Download PDFInfo
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- CN105588220A CN105588220A CN201410835659.9A CN201410835659A CN105588220A CN 105588220 A CN105588220 A CN 105588220A CN 201410835659 A CN201410835659 A CN 201410835659A CN 105588220 A CN105588220 A CN 105588220A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 66
- 238000010257 thawing Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000003507 refrigerant Substances 0.000 claims description 135
- 239000007788 liquid Substances 0.000 claims description 37
- 238000010438 heat treatment Methods 0.000 claims description 32
- 238000002360 preparation method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000005338 heat storage Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The embodiment of the invention provides an outdoor unit, an air conditioning system and a defrosting method of the air conditioning system, and relates to the field of air conditioners. Defrosting is achieved when operating of a compressor is not stopped. The outdoor unit comprises the compressor, a four-way reversing valve, an outdoor heat exchanger, a throttling device, a three-way stop valve, a two-way stop valve, a first gate valve, a second gate valve, a heat accumulator and a three-way element. The inlet end of the first gate valve is connected to a pipeline between the second end of the throttling device and the two-way stop valve, and the outlet end of the first gate valve is connected with the inlet end of the heat accumulator. The inlet end of the second gate valve is connected to a pipeline between the outlet end of the compressor and a first port of the four-way reversing valve, and the outlet end of the second gate valve is connected to a pipeline between the first end of the throttling device and the second end of the outdoor heat exchanger. A third port of the four-way reversing valve is connected with the first inlet end of the three-way element, and the outlet end of the heat accumulator is connected with the second inlet end of the three-way element. The outlet end of the three-way element is connected with the inlet end of the compressor.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an outdoor unit, an air conditioning system and a defrosting method of the outdoor unit.
Background
In the heating process of the air conditioning system, when the external temperature is low, the outdoor heat exchanger is easy to frost, so that the heat exchange effect of the outdoor heat exchanger is reduced, and the heating function of the air conditioning system is influenced. When the frosting reaches a certain degree, the heating effect of the indoor heater is reduced, and even the indoor heat exchanger cannot heat, namely, the heating air higher than the indoor temperature cannot be blown out. Therefore, it is necessary to remove the frost formed on the outdoor heat exchanger, so as to avoid the influence on the heating function of the air conditioning system and ensure the heating effect of the indoor heat exchanger.
In the related art, as shown in fig. 1, an air conditioning system includes: the system comprises a compressor 100, a four-way reversing valve 101, a three-way stop valve 102, an indoor fan 103, an indoor heat exchanger 104, a two-way stop valve 105, an electronic expansion valve 106, an outdoor fan 107 and an outdoor heat exchanger 108. The defrosting mode of the air conditioning system is a reverse circulation defrosting mode. When the air conditioning system is heating, the compressor 100, the indoor fan 103 and the outdoor fan 107 are turned off when it is determined that the outdoor heat exchanger 108 of the air conditioning system needs defrosting. The four-way reversing valve 101 is reversed, the compressor 100 is restarted after the four-way reversing valve 101 is reversed, and high-temperature and high-pressure refrigerant generated by the compressor 100 flows to the outdoor heat exchanger 108 through the four-way reversing valve 101, so that defrosting treatment can be performed on the outdoor heat exchanger 108 through the high-temperature and high-pressure refrigerant. After the refrigerant changes from high temperature and high pressure to liquid low temperature and high pressure, and passes through the electronic expansion valve 106, the liquid low temperature and high pressure refrigerant changes into liquid or gas-liquid mixed low temperature and low pressure refrigerant through the electronic expansion valve 106 because the electronic expansion valve 106 has a throttling function. The liquid or gas-liquid mixed low-temperature and low-pressure refrigerant passes through the indoor heat exchanger 108, exchanges heat with air in the indoor heat exchanger 108, and is changed into gaseous low-temperature and low-pressure refrigerant. And flows into the four-way reversing valve 101 through the indoor heat exchanger 108 and flows into the compressor 100 through the four-way reversing valve 101. After defrosting of the outdoor heat exchanger 108 is completed, the compressor 100 is closed again, the four-way reversing valve 101 is reversed again, and each port of the four-way reversing valve 101 is reversed to correspond to a heating mode of the air conditioning system. The compressor 100, the outdoor fan 107 and the indoor fan 103 are turned on again, so that the air conditioning system resumes the heating mode.
In the process of implementing the defrosting of the air conditioning system, the inventor finds that at least the following problems exist in the prior art: in the defrosting process, the compressor 100 needs to be started and stopped for 2 times in one defrosting period, so that the energy consumption of the air conditioning system is increased, and the operation efficiency of the air conditioning system is influenced.
Disclosure of Invention
The embodiment of the invention provides an outdoor unit, an air conditioning system and a defrosting method thereof, which are used for achieving the aim of defrosting under the condition of not stopping the operation of a compressor, so that the operation efficiency of the air conditioning system is ensured.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides an outdoor unit, including: the system comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a throttling device and a two-way stop valve, wherein the outlet end of the compressor and the first end of the outdoor heat exchanger are respectively connected with a first port and a second port of the four-way reversing valve; the first end and the second end of the throttling device are respectively connected with the second end of the outdoor heat exchanger and the two-way stop valve; the outdoor unit further includes: the heat accumulator comprises a first gate valve, a second gate valve, a heat accumulator and a three-way element; the inlet end of the first gate valve is connected to a pipeline between the second end of the throttling device and the two-way stop valve, and the outlet end of the first gate valve is connected with the inlet end of the heat accumulator; the inlet end of the second gate valve is connected to a pipeline connecting the outlet end of the compressor and the first port of the four-way reversing valve, and the outlet end of the second gate valve is connected to a pipeline between the first end of the throttling device and the second end of the outdoor heat exchanger; the third port of the four-way reversing valve and the outlet end of the heat accumulator are respectively connected with the first inlet end and the second inlet end of the three-way element
Connecting; the heat accumulator is used for absorbing and storing heat emitted by the compressor and heating inflowing refrigerant by using the stored heat; the outlet end of the three-way element is connected with the inlet end of the compressor.
In a second aspect, an embodiment of the present invention provides an air conditioning system, including: an indoor unit and an outdoor unit; the outdoor unit is the outdoor unit of the above embodiment.
In a third aspect, an embodiment of the present invention provides a defrosting method for an air conditioning system, which is applied to the air conditioning system in the foregoing embodiment, and the method includes: determining the running time of the compressor, the outdoor environment temperature and the temperature of the outdoor heat exchanger; when the running time of the compressor reaches a preset time length, determining whether to defrost according to the temperature of the outdoor heat exchanger and the outdoor environment temperature; and when defrosting is determined, the first gate valve and the second gate valve are controlled to be opened, the second inlet end of the three-way element is opened, and the throttling device is closed.
The embodiment of the invention provides an outdoor unit, an air conditioning system and a defrosting method thereof, wherein the outdoor unit comprises: the heat storage device comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a throttling device, a two-way stop valve, a first gate valve, a second gate valve, a heat accumulator and a three-way element, wherein the outlet end of the compressor and the first end of the outdoor heat exchanger are respectively connected with a first port and a second port of the four-way reversing valve; the first end and the second end of the throttling device are respectively connected with the second end of the outdoor heat exchanger and the two-way stop valve; the inlet end of the first gate valve is connected to a pipeline between the second end of the throttling device and the two-way stop valve, the outlet end of the first gate valve is connected with the inlet end of the heat accumulator, the inlet end of the second gate valve is connected to a pipeline between the outlet end of the compressor and the first port of the four-way reversing valve, and the outlet end of the second gate valve is connected to a pipeline between the first end of the throttling device and the second end of the outdoor heat exchanger; the third port of the four-way reversing valve and the outlet end of the heat accumulator are respectively connected with the first inlet end and the second inlet end of the three-way element; the outlet end of the three-way element is connected with the inlet end of the compressor. Thus, when the outdoor unit needs defrosting, the throttling device is closed, the first gate valve and the second gate valve are opened, gaseous refrigerant generated by the compressor is discharged from the outlet end of the compressor, the outlet end of the gaseous refrigerant is connected with the inlet end of the second gate valve, the gaseous refrigerant enters the inlet end of the second gate valve after being discharged from the outlet end of the compressor, and after the gaseous refrigerant enters the inlet end of the second gate valve, the outlet end of the second gate valve is connected to a pipeline between the first end of the throttling device and the second end of the outdoor heat exchanger, and the throttling device is closed, so the gaseous refrigerant flows into the outdoor heat exchanger. The frost on the outdoor heat exchanger can be removed through the heat dissipation of the gaseous refrigerant, and the gaseous refrigerant is changed into the liquid refrigerant and flows out of the first port of the outdoor heat exchanger. The first port of the outdoor heat exchanger is connected with the second port of the four-way reversing valve, so that liquid refrigerant enters the four-way reversing valve through the second port of the four-way reversing valve. The refrigerant entering from the second port of the four-way reversing valve is discharged from the third port of the four-way reversing valve, and the third port of the four-way reversing valve is connected with the first inlet end of the three-way element, so that the liquid refrigerant enters the three-way element through the first inlet end of the three-way element. And flows into the inlet end of the compressor through the outlet end of the tee element. Through the process, when defrosting is needed, the direction of the four-way reversing valve is not needed to be changed, the compressor is not needed to be closed, the throttling device is only needed to be closed, the first gate valve and the second gate valve are opened, and therefore gaseous refrigerant generated by the compressor can flow into the outdoor heat exchanger through the second gate valve, and frost on the outdoor heat exchanger can be removed. Therefore, the invention can eliminate frost on the outdoor heat exchanger in the outdoor unit under the condition of not stopping the operation of the compressor, thereby ensuring the operation efficiency of the air conditioning system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an air conditioning system provided in the prior art;
fig. 2 is a schematic structural diagram of an outdoor unit according to an embodiment of the present invention;
fig. 3 is a second schematic structural diagram of an outdoor unit according to an embodiment of the present invention;
fig. 4 is a third schematic structural diagram of an outdoor unit according to an embodiment of the present invention;
fig. 5 is a fourth schematic structural view of an outdoor unit according to an embodiment of the present invention;
fig. 6 is a fifth schematic structural view of an outdoor unit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention;
fig. 8 is a schematic flow chart illustrating a defrosting method of an air conditioning system according to an embodiment of the present invention;
reference numerals:
201-a compressor, 202-a four-way reversing valve, 203-an outdoor heat exchanger, 204-a throttling device, 205-a first gate valve, 206-a second gate valve, 207-a heat accumulator, 208-a three-way element, 209-a two-way stop valve, 210-a three-way stop valve, 211-a control valve, 601-an indoor unit and 602-an outdoor unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides an air conditioning system, as shown in fig. 2, including a compressor 201, a four-way reversing valve 202, an outdoor heat exchanger 203, a throttling device 204, a first gate valve 205, a second gate valve 206, a heat accumulator 207, a three-way element 208, and a two-way shutoff valve 209.
The outlet end of the compressor 201 and the first end of the outdoor heat exchanger 203 are connected to the first port and the second port of the four-way reversing valve 202, respectively. A first end and a second end of the throttle device 204 are connected to a second end of the outdoor heat exchanger 203 and the two-way shutoff valve 209, respectively.
And the inlet end of the first gate valve 205 is connected to the line between the second end of the throttling device 203 and the two-way shutoff valve 209, and the outlet end of the first gate valve 205 is connected to the inlet end of the thermal accumulator 207. An inlet end of the second gate valve 206 is connected to a line connecting an outlet end of the compressor 201 and a first port of the four-way selector valve 202, and an outlet end of the second gate valve 206 is connected to a line between a first end of the throttling device 204 and a second end of the outdoor heat exchanger 203. The third port of the four-way selector valve 202 and the outlet port of the accumulator 207 are connected to the first inlet port and the second inlet port of the three-way element 208, respectively.
And a heat accumulator 207 for absorbing and storing heat emitted from the compressor 201 and heating the refrigerant flowing in using the stored heat. The outlet end of the three-way element 208 is connected to the inlet end of the compressor 201.
Further, a first gate valve 205 for controlling, when open, the refrigerant to be delivered from the two-way shutoff valve 209 to the inlet end of the accumulator 208; when closed, the refrigerant is blocked from being delivered to the inlet end of the accumulator 207 by the two-way shut-off valve 209.
A second gate valve 206 for controlling refrigerant to be delivered from the outlet end of the compressor 201 to a line between the first end of the throttling device 204 and the second end of the outdoor heat exchanger 203 when opened; when closed, refrigerant is blocked from passing from the outlet end of the compressor 201 to the line between the first end of the throttling device 204 and the second end of the outdoor heat exchanger 203.
The first gate valve 205 and the second gate valve 206 are provided in association with the defrosting process of the outdoor unit. Therefore, when the outdoor unit needs defrosting, the first gate valve 205 and the second gate valve 206 need to be opened. In the heating process or the cooling process of the outdoor unit, the first gate valve 206 and the second gate valve 207 are not opened. Further, in order to ensure the normal operation of the defrosting process, the throttling device 205 is turned off when the air conditioning system is defrosted.
Specifically, during the heating process of the air conditioning system, the outdoor unit closes the first gate valve 205 and the second gate valve 206, and closes the second inlet end of the three-way element 209 and opens the first inlet end thereof. Other devices in the outdoor unit are all opened, and the operation process of the outdoor unit is the same as that of the air conditioning system in the prior art when the heating process is the same, and is not described again.
If the outdoor unit needs defrosting during the heating process of the air conditioning system, the throttle device 204 is closed, the first gate valve 205 and the second gate valve 206 are opened, and the first inlet end and the second inlet end of the three-way element 208 are both opened. Since the throttle device 204 is closed, the refrigerant flowing out of the indoor heat exchanger cannot pass through the throttle device 204. And the first gate valve 206 is opened and the inlet end 205 of the first gate valve is connected to the pipeline between the second end of the throttling device 204 and the two-way cut-off valve 209, so that the refrigerant flowing out of the indoor heat exchanger can enter the first gate valve 205, and the normal operation of the air conditioning system is ensured. Since the second gate valve 206 is opened and the inlet end of the second gate valve 206 is connected to the pipeline connecting the outlet end of the compressor 201 and the first port of the four-way reversing valve 202, the refrigerant flowing out of the outlet end of the compressor 201 can be divided into two paths, one path flows to the inlet end of the second gate valve 206 and the other path flows to the first port of the four-way reversing valve 202.
Thus, when the outdoor unit needs defrosting, the compressor 201 generates gaseous refrigerant according to a predetermined frequency, and the gaseous refrigerant flows out at the outlet end of the compressor 201. At this time, the gaseous refrigerant is divided into two paths, one path enters the second gate valve 206, and the other path enters the four-way reversing valve 202. The outlet end of the second gate valve 207 is connected to the line between the first end of the throttling device 204 and the second end of the outdoor heat exchanger 203, so that the gaseous refrigerant flows into the line connected between the throttling device 204 and the second end of the outdoor heat exchanger 203 through the outlet end of the second gate valve 207. Since the throttle device 204 is closed, the refrigerant in a gaseous state flows into the outdoor heat exchanger 203. After the refrigerant in the gas state flows into the outdoor heat exchanger 203, heat may be dissipated, so that frost may be removed from the outdoor heat exchanger 203. The gaseous refrigerant is changed into a liquid refrigerant after dissipating heat. A first end of the outdoor heat exchanger 203 is connected to a second port of the four-way reversing valve 202 such that liquid refrigerant flows into the four-way reversing valve 202 through the first end of the outdoor heat exchanger 203. And through the third port of the four-way reversing valve 202 into the first inlet port of the three-way element 209 and back to the compressor 201 through the three-way element 209. Thus, through the above process, the four-way selector valve 202 does not need to be switched during the outdoor unit defrosting process, and therefore, the compressor 201 does not need to be stopped, and only the throttle device 204 needs to be closed and the first gate valve 205 and the second gate valve 206 need to be opened. The operation of the compressor is not stopped while the defrosting of the outdoor heat exchanger 203 is achieved, thereby ensuring the operation efficiency of the air conditioning system.
Further, as shown in fig. 3, the outdoor unit further includes: three-way shut-off valve 210.
Wherein, the fourth port of the four-way reversing valve 202 is connected with the three-way stop valve 210.
The three-way shutoff valve and the two-way shutoff valve are devices for connecting the outdoor unit to the indoor unit. The two-way shut-off valve of the outdoor unit has two ends, one end of which is connected to the second end of the throttling device 204, and the other end of which can be used to connect the indoor unit. The three-way stop valve of the outdoor unit may have two ends, one end of which is connected to the fourth port of the four-way reversing valve 202, and the other end of which is connected to the indoor unit. The outdoor unit may transmit the refrigerant to the indoor unit through the two-way cutoff valve or the three-way cutoff valve.
Thus, when the compressor 201 generates gaseous refrigerant according to a preset frequency, the gaseous refrigerant flows out at the outlet end of the compressor 201, the gaseous refrigerant is divided into two paths, one path of the gaseous refrigerant enters the second gate valve 206, and the other path of the gaseous refrigerant enters the four-way reversing valve 202, the gaseous refrigerant flowing into the first port of the four-way reversing valve 202 flows into the four-way reversing valve 202, and then the gaseous refrigerant flows into the indoor unit through the three-way stop valve 210 after flowing out from the fourth port of the four-way reversing valve 202 because the fourth port of the four-way reversing valve 202 is connected with the outdoor connecting end of the three-way stop valve 210. In the indoor heat exchanger of the indoor unit, the gaseous refrigerant exchanges heat with the air in the indoor heat exchanger, so that the air in the indoor heat exchanger is heated, and the heated air can be input into the indoor unit, so that the aim of not reducing the temperature of the indoor unit is fulfilled. In the indoor unit heat exchanger, the gaseous refrigerant exchanges heat with air, becomes a gas-liquid mixed refrigerant, and flows out of the indoor unit. Since the two-way shutoff valve 209 is also connected to the indoor unit, the refrigerant in a gas-liquid mixture state flowing out of the indoor unit can flow into the outdoor unit through the two-way shutoff valve 209. After flowing into the outdoor unit through the two-way shut-off valve 209, since the throttle device 204 is closed, the refrigerant flowing from the indoor unit cannot flow into the throttle device 204, and the first gate valve 206 is opened, and the inlet end 205 of the first gate valve is connected to the pipe between the second end of the throttle device 204 and the two-way shut-off valve 209, the refrigerant flowing from the indoor unit can flow into the first gate valve 205. The outlet end of the first gate valve 205 is connected to the inlet end of the accumulator 207, so that the refrigerant in a gas-liquid mixture state flows into the accumulator 207 from the outlet end of the first gate valve 206. The heat emitted from the compressor 201 is stored in the heat accumulator 207, and therefore, the refrigerant in a gas-liquid mixed state is heated in the heat accumulator 207 and turns into a gaseous refrigerant. The outlet end of the accumulator 208 is connected to the second inlet of the three-way element 208, so that the refrigerant in the gaseous state flows into the three-way element 208 through the outlet end of the accumulator 207, and is joined in one path with the refrigerant in the liquid state flowing in from the first inlet end of the three-way element 208. The outlet end of the three-way member 208 is connected to the inlet end of the compressor 201, so that the merged refrigerant enters the inlet end of the compressor 201 through the outlet end of the three-way member 208.
Like this, through above-mentioned process, when needs defrosting, need not to change the direction of four-way reversing valve, need not to close the compressor, only need close throttling device to open first gate valve and second gate valve, thereby can flow into outdoor heat exchanger through the second gate valve with the gaseous refrigerant that the compressor produced, and then can get rid of the frost on the outdoor heat exchanger. And the gaseous refrigerant part generated by the compressor can also flow into the indoor unit, so that the air in the indoor heat exchanger exchanges heat with the gaseous refrigerant, the heated air is sent to the indoor, and the gas-liquid mixed refrigerant after heat exchange can flow back to the compressor through the first gate valve, thereby completing the heating process of the air conditioning system. Accordingly, it is not necessary to change the four-way selector valve 202 during the defrosting operation of the outdoor unit, and therefore, the compressor 201 does not need to be stopped, and only the throttle device 204 needs to be closed and the first gate valve 205 and the second gate valve 206 need to be opened. Therefore, the aim of defrosting is achieved under the condition that the operation of the compressor is not stopped, and the operation efficiency of the air-conditioning system is ensured. And when the defrosting of the outdoor heat exchanger 203 is realized, gaseous refrigerant is continuously conveyed to the indoor unit, so that the indoor temperature is not reduced, the indoor comfort is improved, and the user experience is improved.
Further, as shown in fig. 4, the outdoor unit further includes: the valve 211 is controlled.
The connection between the third port of the four-way reversing valve 202 and the outlet end of the heat accumulator 207 and the first inlet end and the second inlet end of the three-way element 208 respectively includes: the third port of the four-way reversing valve 202 is connected to the inlet end of the control valve 211. A first outlet end of the control valve 211 is connected to a first inlet end of the three-way element 208. A second outlet port of the control valve 211 is connected to an inlet port of the heat accumulator 207, and an outlet port of the heat accumulator 207 is connected to a second inlet port of the three-way element 208.
And a control valve 211 for controlling the refrigerant output from the third port of the four-way reversing valve 202 to flow back to the inlet end of the compressor 201 through the accumulator 207 or the three-way element 208.
Specifically, the control valve 211 is disposed between the third port of the four-way reversing valve 202 and the line of the first inlet end of the three-way element 208. And the control valve 211 has two outlet ports, a first outlet port of which is connected to the inlet port of the accumulator 207 and a second outlet port of which is connected to a first inlet port of the three-way element 208.
Thus, during the heating process of the air conditioning system in which the outdoor unit is located, the outdoor unit can close the first outlet end of the control valve 211, open the second outlet end, and close the second inlet end of the three-way element 208. The turning on and off of the other devices is consistent with the process described above. That is, the first gate valve 205 and the second gate valve 206 are closed, and the other devices are opened. At this time, the refrigerant flowing out through the third port of the four-way selector valve 202 enters the control valve 211, and enters the three-way element 208 through the first outlet port of the control valve 211, and enters the inlet port of the compressor 201 through the outlet port of the three-way element 208.
When the outdoor unit needs defrosting, the first outlet of the control valve 211 is opened, the second outlet is closed, and the first inlet of the three-way element 208 is closed. The turning on and off of the other devices is consistent with the process described above. I.e. the throttle device 204 is closed and the first gate valve 205 and the second gate valve 206 are opened. At this time, the liquid refrigerant flowing out through the third port of the four-way selector valve 202 flows into the control valve 211, and flows into the accumulator 207 through the first outlet port of the control valve 211. The liquid refrigerant is heated by the heat accumulator 207, and changed into a gaseous refrigerant, which flows out through the outlet end of the heat accumulator 207. Since the outlet end of the accumulator 207 is connected to the second inlet end of the three-way element 208, the refrigerant in the gaseous state flows into the three-way element 208 and flows into the inlet end of the compressor 201 through the outlet end of the three-way element 208.
Further, the control valve 211 includes: and a three-way valve.
It should be noted that the control valve 211 may also include another specific inlet port, two outlet ports, and a device for controlling the on/off of the two outlet ports. The invention is not limited in this regard.
Further, the second gate valve 206 includes: a one-way valve, as shown in figure 5.
It should be noted that the second gate valve may also be another device having an on-off function, for example, the second gate valve is a solenoid valve, which is not limited by the present invention.
Further, the first gate valve 205 includes: solenoid valve, as shown with reference to fig. 5.
It should be noted that the first gate valve may also be another device having an on-off function, and the present invention is not limited thereto.
It should be noted that the tee component described in the present invention refers to a device having functions of collecting, splitting, etc. or similar functions, including but not limited to tee, splitting manifold, etc., and the present invention is not limited thereto.
Further, the throttling device 204 includes: electronic expansion valve, as shown in fig. 6.
It should be noted that, in the embodiment of the present invention, the throttling device 204 may also be another device having a throttling function, for example, a thermal expansion valve, which is not limited by the present invention.
Further, the heat accumulator 207 is a phase change heat accumulator or a liquid heat accumulator wrapped on the surface of the compressor 201.
In order to better absorb and store the heat emitted from the compressor 201 by the heat accumulator 207, the heat accumulator 207 may be wrapped on the surface of the compressor 201.
It should be noted that the heat accumulator 207 in the embodiment of the present invention may also be another device capable of storing heat dissipated by the compressor, and the present invention is not limited to this.
An embodiment of the present invention provides an outdoor unit, including: the heat storage device comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a throttling device, a two-way stop valve, a first gate valve, a second gate valve, a heat accumulator and a three-way element, wherein the outlet end of the compressor and the first end of the outdoor heat exchanger are respectively connected with a first port and a second port of the four-way reversing valve; the first end and the second end of the throttling device are respectively connected with the second end of the outdoor heat exchanger and the two-way stop valve; the inlet end of the first gate valve is connected to a pipeline between the second end of the throttling device and the two-way stop valve, the outlet end of the first gate valve is connected with the inlet end of the heat accumulator, the inlet end of the second gate valve is connected to a pipeline between the outlet end of the compressor and the first port of the four-way reversing valve, and the outlet end of the second gate valve is connected to a pipeline between the throttling device and the second end of the outdoor heat exchanger; the third port of the four-way reversing valve and the outlet end of the heat accumulator are respectively connected with the first inlet end and the second inlet end of the three-way element; the outlet end of the three-way element is connected with the inlet end of the compressor. Thus, when the outdoor unit needs defrosting, the throttling device is closed, the first gate valve and the second gate valve are opened, gaseous refrigerant generated by the compressor is discharged from the outlet end of the compressor, the outlet end of the gaseous refrigerant is connected with the inlet end of the second gate valve, the gaseous refrigerant enters the inlet end of the second gate valve after being discharged from the outlet end of the compressor, and after the gaseous refrigerant enters the inlet end of the second gate valve, the outlet end of the second gate valve is connected to a pipeline between the throttling device and the second end of the outdoor heat exchanger, and the throttling device is closed, so the gaseous refrigerant flows into the outdoor heat exchanger. The frost on the outdoor heat exchanger can be removed through the heat dissipation of the gaseous refrigerant, and the gaseous refrigerant is changed into the liquid refrigerant and flows out of the first port of the outdoor heat exchanger. The first port of the outdoor heat exchanger is connected with the second port of the four-way reversing valve, so that liquid refrigerant enters the four-way reversing valve through the second port of the four-way reversing valve. The refrigerant entering from the second port of the four-way reversing valve is discharged from the third port of the four-way reversing valve, and the third port of the four-way reversing valve is connected with the first inlet end of the three-way element, so that the liquid refrigerant enters the three-way element through the first inlet end of the three-way element. And flows into the inlet end of the compressor through the outlet end of the tee element. Through the process, when defrosting is needed, the direction of the four-way reversing valve is not needed to be changed, the compressor is not needed to be closed, the throttling device is only needed to be closed, the first gate valve and the second gate valve are opened, and therefore gaseous refrigerant generated by the compressor can flow into the outdoor heat exchanger through the second gate valve, and frost on the outdoor heat exchanger can be removed. And the gaseous refrigerant part generated by the compressor can also flow into the indoor unit, so that the air in the indoor heat exchanger exchanges heat with the gaseous refrigerant, the heated air is sent to the indoor, and the gas-liquid mixed refrigerant after heat exchange can flow back to the compressor through the first gate valve, thereby completing the heating process of the air conditioning system. Therefore, the invention can eliminate frost on the outdoor heat exchanger in the outdoor unit under the condition of not stopping the operation of the compressor, thereby ensuring the operation efficiency of the air conditioning system. Moreover, when frost on the outdoor heat exchanger in the outdoor unit is eliminated, the heating process can be guaranteed not to stop, namely heated air is input into the indoor space while the frost on the outdoor heat exchanger in the outdoor unit is eliminated, the indoor temperature is guaranteed not to be reduced, the indoor comfort level is improved, and further the user experience is improved.
An embodiment of the present invention provides an air conditioning system, as shown in fig. 7, including: indoor unit 601 and outdoor unit 602.
The outdoor unit 602 is the outdoor unit described in the above embodiments.
That is, the outdoor unit includes a compressor, a four-way reversing valve, an outdoor heat exchanger, a throttling device, a first gate valve, a second gate valve, a heat accumulator, a three-way element, and a two-way stop valve.
The outlet end of the compressor and the first end of the outdoor heat exchanger are respectively connected with the first port and the second port of the four-way reversing valve. And the first end and the second end of the throttling device are respectively connected with the second end of the outdoor heat exchanger and the two-way stop valve. And the inlet end of the first gate valve is connected to a pipeline between the second end of the throttling device and the two-way stop valve, and the outlet end of the first gate valve is connected with the inlet end of the heat accumulator. The inlet end of the second gate valve is connected to a pipeline connecting the outlet end of the compressor and the first port of the four-way reversing valve, and the outlet end of the second gate valve is connected to a pipeline between the first end of the throttling device and the second end of the outdoor heat exchanger. And a third port of the four-way reversing valve and the outlet end of the heat accumulator are respectively connected with a first inlet end and a second inlet end of the three-way element.
Further, the outdoor unit further includes: three-way stop valve. And the fourth port of the four-way reversing valve is connected with the three-way stop valve. At this time, the outdoor unit is connected to the indoor unit through the three-way stop valve and the two-way stop valve.
Further, the indoor unit includes: an indoor heat exchanger, an indoor fan, is shown with reference to fig. 7.
Therefore, gaseous refrigerant generated by the compressor of the outdoor unit flows to one path of the first port of the four-way reversing valve, can flow into the indoor heat exchanger of the indoor unit through the fourth port of the four-way reversing valve and the three-way stop valve, and exchanges heat with air in the indoor heat exchanger, so that the air in the indoor heat exchanger is heated, heated air is provided for the indoor, and the indoor temperature can be guaranteed. And the refrigerant after heat exchange with the air in the indoor heat exchanger flows to the first gate valve of the outdoor unit through the two-way stop valve and flows to the heat accumulator, flows to the second inlet end of the three-way element after being heated by the heat accumulator, and finally flows into the compressor through the outlet end of the three-way element, so that the heating process of the air conditioning system is completed. And the gaseous refrigerant generated by the compressor of the outdoor unit flows to one path of the second gate valve and can flow into the outdoor heat exchanger of the outdoor unit through the second gate valve, frost on the outdoor heat exchanger of the outdoor unit is eliminated, and the part of refrigerant flows to the first inlet end of the three-way element through the third port of the four-way reversing valve, so that the refrigerant flows into the compressor through the outlet end of the three-way element, and the defrosting process of the air conditioning system is completed. Therefore, the air conditioning system of the invention can eliminate frost on the outdoor heat exchanger of the outdoor unit and simultaneously ensure that the indoor temperature is not reduced, thereby ensuring the operating efficiency of the air conditioning system and the indoor comfort level.
The embodiment of the invention provides a defrosting method of an air conditioning system, which is applied to the air conditioning system. The air conditioning system is the air conditioning system described in the above embodiment. Namely, the air conditioning system includes: indoor unit and outdoor unit.
Further, the outdoor unit comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a throttling device, a first gate valve, a second gate valve, a heat accumulator, a three-way element and a two-way stop valve. The outlet end of the compressor and the first end of the outdoor heat exchanger are respectively connected with the first port and the second port of the four-way reversing valve. And the first end and the second end of the throttling device are respectively connected with the second end of the outdoor heat exchanger and the two-way stop valve. And the inlet end of the first gate valve is connected to a pipeline between the second end of the throttling device and the two-way stop valve, and the outlet end of the first gate valve is connected with the inlet end of the heat accumulator. The inlet end of the second gate valve is connected to a pipeline connecting the outlet end of the compressor and the first port of the four-way reversing valve, and the outlet end of the second gate valve is connected to a pipeline between the first end of the throttling device and the second end of the outdoor heat exchanger. And a third port of the four-way reversing valve and the outlet end of the heat accumulator are respectively connected with a first inlet end and a second inlet end of the three-way element.
The method, as shown in fig. 8, includes:
701. the compressor run time, the outdoor ambient temperature, and the temperature of the outdoor heat exchanger are determined.
It should be noted that, during the operation of the air conditioning system, the opening and closing of each device in the outdoor unit is controlled by the control module of the outdoor unit. For example, when the air conditioning system is in a heating process, the control module of the outdoor unit controls the first gate valve and the second gate valve of the air conditioning system to close, closes the second inlet end of the three-way element, and adjusts the four-way reversing valve to a corresponding mode in the heating process. Namely, gaseous refrigerant generated by the compressor enters through the first port of the four-way reversing valve, flows out through the fourth port and flows into the indoor heat exchanger. After the refrigerant in the outdoor heat exchanger flows into the four-way reversing valve through the second port of the four-way reversing valve, the refrigerant flows out of the four-way reversing valve through the third port of the four-way reversing valve and flows to the inlet end of the compressor. The first inlet end of the three-way element is connected with the third port of the four-way reversing valve, and the second inlet end of the three-way element is connected with the outlet end of the heat accumulator, so that in the heating process, in order to prevent the refrigerant flowing out of the third port of the four-way reversing valve from flowing into the three-way element through the three-way element and the first inlet end and then flowing into the heat accumulator through the second inlet end, the control module of the outdoor unit controls the second inlet end of the three-way element to be closed.
Specifically, the control module of the outdoor unit can determine the outdoor environment temperature and the temperature of the outdoor heat exchanger through the temperature sensor. The control module of the outdoor unit can record the running time of the compressor when the compressor runs.
In this case, a temperature sensor needs to be provided in the outdoor unit of the air conditioning system.
It should be noted that the control module of the outdoor unit may be an outdoor control panel, and certainly, may also be other devices capable of controlling the on and off of each device in the outdoor unit, which is not limited in the present invention.
702. And when the running time of the compressor reaches the preset time length, determining whether to defrost according to the temperature of the outdoor heat exchanger and the outdoor environment temperature.
Specifically, the control module of the outdoor unit detects the running time t of the compressor in the heating process of the compressorCompressor with a compressor housing having a plurality of compressor bladesWhether the preset time t is reached0If the compressor running time t is detectedCompression Machine for workingReaches the preset time t0Then it is necessary to determine the temperature T of the outdoor heat exchanger within T minutesOutdoor heat exchange Temperature of the vesselWhether or not it is less than the first preset temperature T1And outdoor ambient temperature TOutdoor ambient temperatureTemperature T of outdoor heat exchangerTemperature of outdoor heat exchangerWhether the difference between the two is greater than the second preset temperature T2. If the temperature T of the outdoor heat exchanger is determined within T minutesTemperature of outdoor heat exchangerLess than a first predetermined temperature T1And the difference between the outdoor environment temperature and the outdoor heat exchanger temperature is greater than a second preset temperature T2Then it is determined that defrosting is required.
That is, during the heating operation, if the control module of the outdoor unit detects: press run time tCompressor with a compressor housing having a plurality of compressor blades≥t0And in T minutes, TTemperature of outdoor heat exchanger≤T1And T isChamber Outside ambient temperature-TTemperature of outdoor heat exchanger≥T2And if the conditions are met, determining that defrosting is needed.
If the above condition is not met, the operation time t of the press is determinedCompressor with a compressor housing having a plurality of compressor blades≥t0In time, the temperature of the outdoor heat exchanger does not meet the temperature T within T minutesTemperature of outdoor heat exchanger≤T1And T isOutdoor ambient temperature-TTemperature of outdoor heat exchanger≥T2The control module of the outdoor unit determines the temperature T of the outdoor heat exchanger within T minutesOutdoor exchanger Temperature of the heaterWhether it is less than the third preset temperature value T3. If the defrosting control device determines that the time is within t minutes, the outdoor heat exchangerTemperature TTemperature of outdoor heat exchangerLess than a third preset temperature value T3Then defrost is determined.
It should be noted that the preset time period t0A first preset temperature value T1A second preset temperature value T2And a third preset temperature value T3Is preset. Can be adjusted according to actual requirements, and the invention is not limited to this.
703. And when defrosting is determined, the first gate valve and the second gate valve are controlled to be opened, the second inlet end of the three-way element is opened, and the throttling device is closed.
Specifically, when the control module of the outdoor unit determines that defrosting is required, the control module of the outdoor unit controls the first gate valve and the second gate valve to be opened, the second inlet end of the three-way element is opened, and the throttling device is closed.
Thus, the air conditioning system is switched from the heating process to the defrosting process. At this time, the gaseous refrigerant generated by the compressor is divided into two paths after flowing out from the outlet end of the compressor, wherein one path enters the second gate valve, and the other path flows into the first port of the four-way reversing valve. The gaseous refrigerant entering the second gate valve flows through the outlet end of the second gate valve into the outdoor heat exchanger. The heat is dissipated in the outdoor heat exchanger and becomes a liquid refrigerant. And the frost on the outdoor heat exchanger absorbs heat to be dissolved, so that the frost on the outer heat exchanger can be removed. The liquid refrigerant flows out from the first end of the outdoor heat exchanger, flows into the four-way reversing valve through the second port of the four-way reversing valve, flows out through the third port of the four-way reversing valve and further flows into the three-way element through the first inlet end of the three-way element. And the gaseous refrigerant entering the first port of the four-way reversing valve exits through the fourth port of the four-way reversing valve. And flows into the indoor unit through the three-way stop valve. When the gaseous refrigerant flows to the indoor heat exchanger of the indoor unit, the gaseous refrigerant exchanges heat with air of the indoor heat exchanger in the indoor heat exchanger, the gaseous refrigerant dissipates heat, and the air of the indoor heat exchanger is heated, so that the gaseous refrigerant is changed into a liquid refrigerant. And the heated air of the indoor heat exchanger is conveyed to the indoor, so that the indoor temperature is ensured not to be reduced in the defrosting process. And the refrigerant changed into a liquid state flows out through the other end of the indoor heat exchanger. And flows into the outdoor unit through the two-way stop valve, flows into the first gate valve, and flows out through the outlet end of the first gate valve, thereby flowing into the heat accumulator. The liquid refrigerant is heated in the accumulator, changed to a gaseous refrigerant, and exits through the outlet end of the accumulator. Since the outlet end of the accumulator is connected to the second inlet end of the three-way element, the gaseous refrigerant flows into the three-way element through the second inlet end of the three-way element. In the three-way element, the refrigerant flowing in from the first inlet end of the three-way element is combined into a path of gas-liquid mixed refrigerant. And flows into the inlet end of the compressor through the outlet end of the three-way element to complete the defrosting process.
Further, the outdoor unit may further include a control valve disposed between the third port of the four-way reversing valve and the first inlet end of the three-way element. And the inlet end of the control valve is connected with the third port of the four-way reversing valve, the first outlet end of the control valve is connected with the first inlet end of the three-way element, and the second outlet end of the control valve is connected with the inlet end of the heat accumulator.
Therefore, in the defrosting process, the control module of the outdoor unit controls the first gate valve and the second gate valve to be opened, the second inlet end of the three-way element is opened, the throttling device is closed, the first outlet end of the control valve needs to be closed, the second outlet end of the control valve needs to be opened, and the first inlet end of the three-way element needs to be closed. So that the liquid refrigerant flowing out of the third port of the four-way reversing valve flows into the control valve and then enters the heat accumulator through the second outlet end of the control valve. The refrigerant, heated in the accumulator to become a gaseous state, flows into the three-way element through the second inlet end of the three-way element and further flows into the inlet end of the compressor through the three-way element. That is, when the outdoor unit includes the control valve, the control valve controls the refrigerant flowing out of the four-way selector valve to enter the accumulator and join the refrigerant entering the indoor heat exchanger in the accumulator.
It should be noted that, when the outdoor unit includes the control valve, in the heating process of the air conditioning system, the control module of the outdoor unit controls the first gate valve and the second gate valve of the air conditioning system to close, and closes the second inlet end of the three-way element, and at the same time, also needs to close the second outlet end of the control valve, and opens the first outlet end of the control valve. Thus, after entering the control valve, the refrigerant flowing out of the third port of the four-way reversing valve flows into the first inlet end of the three-way element through the first outlet end of the control valve and flows into the inlet end of the compressor through the outlet end of the three-way element. The second inlet end of the three-way element and the second outlet end of the control valve are closed, so that the refrigerant is prevented from flowing into the heat accumulator in the heating process, and the heat of the heat accumulator is absorbed to influence the defrosting effect.
The embodiment of the invention provides a defrosting method of an air conditioning system, which can firstly determine the running time of a compressor, the outdoor environment temperature, the temperature of an outdoor heat exchanger and the environment temperature, determine whether the air conditioning system needs defrosting or not according to the temperature of the outdoor heat exchanger and the environment temperature when the running time of the compressor reaches the preset time length, and control a first gate valve and a second gate valve to be opened, open a second inlet end of a three-way element and close a throttling device when determining that defrosting is needed. Therefore, in the heating process of the air conditioning system, when the outdoor unit needs defrosting, gaseous refrigerant generated by the compressor is discharged from the outlet end of the outdoor unit, and the outlet end of the outdoor unit is connected with the four-way reversing valve and the inlet end of the second gate valve, so that the gaseous refrigerant is discharged from the outlet end of the compressor and then is divided into two paths, wherein one path enters the inlet end of the second gate valve, and the other path enters the first port of the four-way reversing valve. After the gaseous refrigerant enters the inlet end of the second gate valve, the outlet end of the second gate valve is connected to the pipeline between the first end of the throttling device and the second end of the outdoor heat exchanger, so that the gaseous refrigerant enters the pipeline and flows into the outdoor heat exchanger. The frost on the outdoor heat exchanger can be removed by the heat dissipation of the gaseous refrigerant in the outdoor heat exchanger, and the gaseous refrigerant is changed into the liquid refrigerant and flows out from the first port of the outdoor heat exchanger. The first port of the outdoor heat exchanger is connected with the second port of the four-way reversing valve, so that liquid refrigerant enters the four-way reversing valve through the second port of the four-way reversing valve. The refrigerant entering from the second port of the four-way reversing valve is discharged from the third port of the four-way reversing valve, and the third port of the four-way reversing valve is connected with the first inlet end of the three-way element, so that the liquid refrigerant enters the three-way element through the first inlet end of the three-way element. And finishing the defrosting process of the air conditioning system.
The gaseous refrigerant generated by the compressor of the outdoor unit flows to one path of the first port of the four-way reversing valve, flows into the indoor heat exchanger of the indoor unit through the fourth port of the four-way reversing valve and the three-way stop valve, and exchanges heat with air in the indoor heat exchanger, so that the air in the indoor heat exchanger is heated, the heated air is provided for the indoor, and the indoor temperature can be ensured. The refrigerant, which has exchanged heat with the air in the indoor heat exchanger, flows to the first gate valve of the outdoor unit through the two-way stop valve, flows to the heat accumulator, is heated by the heat accumulator, and then flows to the three-way element through the second port of the three-way element. And then the refrigerant is combined with the refrigerant flowing in through the first port of the three-way element into a path of gas-liquid mixed refrigerant. And flows into the inlet end of the compressor through the outlet end of the tee element. And finishing the heating process of the air conditioning system.
Through the process, when defrosting is needed, the direction of the four-way reversing valve is not needed to be changed, the compressor is not needed to be closed, the throttling device is only needed to be closed, the first gate valve and the second gate valve are opened, and therefore gaseous refrigerant generated by the compressor can flow into the outdoor heat exchanger through the second gate valve, and frost on the outdoor heat exchanger can be removed. In addition, the gaseous refrigerant part generated by the compressor can also flow into the indoor unit, so that the air in the indoor heat exchanger exchanges heat with the gaseous refrigerant, the heated air is sent to the indoor, and the gas-liquid mixed refrigerant after heat exchange can flow back to the compressor through the first gate valve, thereby completing the heating process. Therefore, the invention can eliminate frost on the outdoor heat exchanger of the outdoor unit and ensure that the indoor temperature is not reduced, thereby ensuring the operating efficiency of the air conditioning system and the indoor comfort level.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An outdoor unit comprising: the system comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a throttling device and a two-way stop valve, wherein the outlet end of the compressor and the first end of the outdoor heat exchanger are respectively connected with a first port and a second port of the four-way reversing valve; the first end and the second end of the throttling device are respectively connected with the second end of the outdoor heat exchanger and the two-way stop valve; it is characterized in that the preparation method is characterized in that,
the outdoor unit further includes: the heat accumulator comprises a first gate valve, a second gate valve, a heat accumulator and a three-way element; wherein,
the inlet end of the first gate valve is connected to a pipeline between the second end of the throttling device and the two-way stop valve, and the outlet end of the first gate valve is connected with the inlet end of the heat accumulator;
the inlet end of the second gate valve is connected to a pipeline connecting the outlet end of the compressor and the first port of the four-way reversing valve, and the outlet end of the second gate valve is connected to a pipeline between the first end of the throttling device and the second end of the outdoor heat exchanger;
the third port of the four-way reversing valve and the outlet end of the heat accumulator are respectively connected with the first inlet end and the second inlet end of the three-way element;
the heat accumulator is used for absorbing and storing heat emitted by the compressor and heating inflowing refrigerant by using the stored heat;
the outlet end of the three-way element is connected with the inlet end of the compressor.
2. The outdoor unit of claim 1, further comprising: a three-way stop valve is arranged on the upper end of the valve body,
and a fourth port of the four-way reversing valve is connected with the three-way stop valve.
3. The outdoor unit of claim 1, further comprising: a control valve;
the third port of the four-way reversing valve and the outlet end of the heat accumulator are respectively connected with the first inlet end and the second inlet end of the three-way element, and the three-way element comprises:
the third port of the four-way reversing valve is connected with the inlet end of the control valve;
the first outlet end of the control valve is connected with the first inlet end of the three-way element;
the second outlet end of the control valve is connected with the inlet end of the heat accumulator, and the outlet end of the heat accumulator is connected with the second inlet end of the three-way element;
and the control valve is used for controlling the refrigerant output by the third port of the four-way reversing valve to flow back to the inlet end of the compressor through the heat accumulator or the three-way element.
4. The outdoor unit of claim 3, wherein the control valve comprises a three-way valve.
5. The outdoor unit of any one of claims 1 to 4, wherein the second gate valve comprises: a one-way valve.
6. The outdoor unit of any one of claims 1 to 4, wherein the first gate valve comprises: an electromagnetic valve.
7. The outdoor unit of any one of claims 1 to 4, wherein the throttling device comprises: an electronic expansion valve.
8. The outdoor unit of any one of claims 1 to 4, wherein the heat accumulator is a phase change heat accumulator or a liquid heat accumulator wrapped around the surface of the compressor.
9. An air conditioning system, comprising: an indoor unit and an outdoor unit;
the outdoor unit of any one of claims 1 to 8.
10. A defrosting method for an air conditioning system, which is applied to the air conditioning system of claim 9, the method comprising:
determining the running time of the compressor, the outdoor environment temperature and the temperature of the outdoor heat exchanger;
when the running time of the compressor reaches a preset time length, determining whether to defrost according to the temperature of the outdoor heat exchanger and the outdoor environment temperature;
and when defrosting is determined, the first gate valve and the second gate valve are controlled to be opened, the second inlet end of the three-way element is opened, and the throttling device is closed.
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Address after: 266736 Hisense Road 1, South Village Town, Pingdu City, Qingdao, Shandong Applicant after: Hisense (Shandong) Air-conditioning Co., Ltd. Address before: 266100 Zhuzhou Road, Laoshan District, Qingdao, Shandong Province, No. 151 Applicant before: Hisense (Shandong) Air-conditioning Co., Ltd. |
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