CN112503752A - Air conditioner with variable air duct and control method - Google Patents
Air conditioner with variable air duct and control method Download PDFInfo
- Publication number
- CN112503752A CN112503752A CN202011492647.2A CN202011492647A CN112503752A CN 112503752 A CN112503752 A CN 112503752A CN 202011492647 A CN202011492647 A CN 202011492647A CN 112503752 A CN112503752 A CN 112503752A
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- Prior art keywords
- air duct
- control valve
- heat exchanger
- reversing
- air
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
- F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
Abstract
The invention discloses an air conditioner with a variable air duct and a control method, wherein the air conditioner comprises: the heat exchanger comprises a heat exchange air duct, an intermediate heat exchanger and a final heat exchanger, wherein the intermediate heat exchanger and the final heat exchanger are arranged at intervals; the air conditioner comprises a first reversing air duct, a second reversing air duct, a third reversing air duct, a first control valve, a second control valve and a third control valve, wherein the first reversing air duct, the second reversing air duct and the third reversing air duct are communicated with the heat exchange air duct. The air conditioner provided by the invention can change the path of the air flow by matching the reversing air duct with the control valve, so that the heat exchange sequence of the air flow is switched from first exchanging heat with the intermediate heat exchanger, then exchanging heat with the final heat exchanger, to first exchanging heat with the final heat exchanger, then exchanging heat with the intermediate heat exchanger, and defrosting the final heat exchanger by using the air flow with higher temperature, thereby solving the problem of frosting of the final heat exchanger and ensuring the refrigeration effect of the system.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioner with a variable air duct and a control method.
Background
Defrosting is a common problem in a refrigeration system, and for a heat pump system, the most common defrosting mode in the industry is to change the flow direction of a refrigerant by reversing a four-way valve, so that a high-temperature refrigerant is subjected to defrosting effect through a frosted heat exchanger, but the mode can cause the problem of large fluctuation of the outlet air temperature of a user side.
For a multi-split system, a plurality of heat exchangers can be used for defrosting one by one to reduce temperature fluctuation, but the method has great limitation, and the system can be realized only when the plurality of heat exchangers are used in parallel.
For an airplane ground air conditioner, the air inlet temperature is 35 ℃ required by the industry standard, the air outlet temperature is kept below 2 ℃ and is controllable, because the heat exchange temperature difference is large, the whole airplane is generally serially connected by a plurality of independent compressor refrigeration systems to realize multi-stage cooling, a plurality of evaporators are serially arranged to ensure that the air outlet temperature is lower than 2 ℃, and the evaporation temperature of the last stage of evaporator is kept at-3 ℃ or even lower, so the frosting problem is easy to occur.
Disclosure of Invention
The invention discloses an air conditioner with a variable air duct and a control method, which solve the problem that a final-stage heat exchanger is easy to frost.
According to an aspect of the present invention, there is disclosed an air conditioner including: the heat exchange air duct is provided with an air inlet and an air outlet; a heat exchanger, the heat exchanger comprising: the intermediate heat exchanger and the final heat exchanger are arranged at intervals along the direction from the air inlet to the air outlet; the first reversing air duct is communicated with the heat exchange air duct, an inlet of the first reversing air duct is positioned between the air inlet and the intermediate heat exchanger, and an outlet of the first reversing air duct is positioned between the intermediate heat exchanger and the final-stage heat exchanger; the second reversing air duct is communicated with the heat exchange air duct, an inlet of the second reversing air duct is positioned between the final-stage heat exchanger and the air outlet, and an outlet of the second reversing air duct is positioned between the intermediate heat exchanger and an outlet of the first reversing air duct; a third reversing air duct, the third reversing air duct being communicated with the heat exchange air duct, an inlet of the third reversing air duct being located between the inlet of the first reversing air duct and the intermediate heat exchanger, and an outlet of the third reversing air duct being located between the final heat exchanger and the air outlet; the first control valve is arranged at the inlet of the first reversing air duct and has a first state and a second state; in the first state, the first control valve opens the heat exchange air duct and closes the first reversing air duct at the same time; in the second state, the first control valve closes the heat exchange air duct and simultaneously opens the first reversing air duct; the second control valve is arranged at the inlet of the second reversing air duct and has a third state and a fourth state; in the third state, the second control valve opens the heat exchange air duct and closes the second reversing air duct at the same time; in the fourth state, the second control valve closes the heat exchange air duct and simultaneously opens the second reversing air duct; a third control valve disposed between the outlet of the first reversing air duct and the outlet of the second reversing air duct, the third control valve having an open state and a closed state.
Further, the air conditioner further includes: and the fourth control valve is arranged in the third reversing air duct and has an opening state and a closing state.
Further, the heat exchanger further comprises: the front heat exchanger is arranged in the heat exchange air duct and is positioned between the air inlet and the first reversing air duct inlet.
Furthermore, the front heat exchangers are multiple, and the front heat exchangers are arranged in the heat exchange air duct at intervals.
Further, the first control valve and the second control valve are both electric wind shields, and the third control valve is a wind valve.
Further, the fourth control valve is an air valve.
Further, the air conditioner is an aircraft ground air conditioner.
According to a second aspect of the present invention, there is disclosed a control method for controlling the above air conditioner, comprising the steps of: s10: judging whether the final-stage heat exchanger frosts; s20: if yes, controlling the air conditioner to enter a defrosting mode; if not, controlling the air conditioner to enter a normal mode;
in the normal mode, the intermediate heat exchanger evaporation temperature is controlled to be T2, the evaporation temperature of the final stage heat exchanger is controlled to be T3, the first control valve is switched to a first state, the second control valve is switched to a third state, and the third control valve is switched to an open state; in the defrosting mode, the final stage heat exchanger evaporation temperature is controlled to be T3, the intermediate heat exchanger evaporation temperature is controlled to be T2, the first control valve is switched to a second state, the second control valve is switched to a fourth state, and the third control valve is switched to a closed state; wherein T2> T3.
Further, the air conditioner further includes a fourth control valve disposed in the third reversing air duct, the fourth control valve having an open state and a closed state, and the step S20 further includes: in the normal mode, the fourth control valve is switched to a closed state; in the defrosting mode, the fourth control valve is switched to an open state.
The air conditioner is provided with a first reversing air duct, a second reversing air duct, a third reversing air duct, a first control valve, a second control valve and a third control valve, and the reversing air duct is matched with the control valves, so that the path of air flow can be changed, the heat exchange sequence of the air flow is switched from the heat exchange with an intermediate heat exchanger to the heat exchange with a final heat exchanger, then the heat exchange with the intermediate heat exchanger is carried out, and the final heat exchanger is defrosted by using the air flow with higher temperature, so that the problem of frosting of the final heat exchanger is solved, and the refrigeration effect of the system is ensured.
Drawings
Fig. 1 is a schematic view of a duct structure in a normal mode of an air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an air duct in a defrosting mode of an air conditioner according to an embodiment of the present invention;
fig. 3 is an operational schematic diagram of an air conditioner according to an embodiment of the present invention;
legend: 10. a heat exchange air duct; 11. an air inlet; 12. an air outlet; 21. a front heat exchanger; 22. an intermediate heat exchanger; 23. a final stage heat exchanger; 30. a first reversing air duct; 40. a second reversing air duct; 50. a third reversing air duct; 61. a first control valve; 62. a second control valve; 63. a third control valve; 64. a fourth control valve.
Detailed Description
The present invention is further illustrated by the following examples, but is not limited to the details of the description.
As shown in fig. 1 and 2, the present invention discloses an air conditioner, including: the air conditioner comprises a heat exchange air duct 10, a heat exchanger, a first reversing air duct 30, a second reversing air duct 40, a third reversing air duct 50, a first control valve 61, a second control valve 62 and a third control valve 63, wherein the heat exchange air duct 10 is provided with an air inlet 11 and an air outlet 12; the heat exchanger includes: the intermediate heat exchanger 22 and the final heat exchanger 23 are arranged at intervals along the direction from the air inlet 11 to the air outlet 12; the first reversing air duct 30 is communicated with the heat exchange air duct 10, an inlet of the first reversing air duct 30 is positioned between the air inlet 11 and the intermediate heat exchanger 22, and an outlet of the first reversing air duct 30 is positioned between the intermediate heat exchanger 22 and the final-stage heat exchanger 23; the second reversing air duct 40 is communicated with the heat exchange air duct 10, an inlet of the second reversing air duct 40 is positioned between the final-stage heat exchanger 23 and the air outlet 12, and an outlet of the second reversing air duct 40 is positioned between the intermediate heat exchanger 22 and the outlet of the first reversing air duct 30; the third reversing air duct 50 is communicated with the heat exchange air duct 10, an inlet of the third reversing air duct 50 is positioned between the inlet of the first reversing air duct 30 and the intermediate heat exchanger 22, and an outlet of the third reversing air duct 50 is positioned between the final-stage heat exchanger 23 and the air outlet 12; a first control valve 61 is arranged at the inlet of the first reversing air duct 30, and the first control valve 61 has a first state and a second state; in the first state, the first control valve 61 opens the heat exchange air duct 10 and closes the first reversing air duct 30; in the second state, the first control valve 61 closes the heat exchange air duct 10 and opens the first reversing air duct 30; a second control valve 62 is disposed at the inlet of the second reversing air duct 40, the second control valve 62 having a third state and a fourth state; in the third state, the second control valve 62 opens the heat exchange air duct 10 and closes the second reversing air duct 40; in the fourth state, the second control valve 62 closes the heat exchange air duct 10 and simultaneously opens the second reversing air duct 40; a third control valve 63 is disposed between the outlet of the first reversing air duct 30 and the outlet of the second reversing air duct 40, the third control valve 63 having an open state and a closed state.
The air conditioner is provided with a first reversing air duct 30, a second reversing air duct 40, a third reversing air duct 50, a first control valve 61, a second control valve 62 and a third control valve 63, and the reversing air ducts are matched with the control valves, so that the path of air flow can be changed, the heat exchange sequence of the air flow is changed from first exchanging heat with the intermediate heat exchanger 22, then exchanging heat with the final-stage heat exchanger 23, to first exchanging heat with the final-stage heat exchanger 23, then exchanging heat with the intermediate heat exchanger 22, and defrosting is carried out on the final-stage heat exchanger 23 by using the air flow with higher temperature, so that the problem of frosting of the final-stage heat exchanger 23 is solved, and the refrigeration effect of the system.
In the above embodiment, the air conditioner further includes the fourth control valve 64, the fourth control valve 64 being disposed in the third reversing duct 50, the fourth control valve 64 having an open state and a closed state. The fourth control valve 64 is arranged in the air conditioner of the invention, so that the third reversing air duct 50 can be closed when the air conditioner normally operates, and thus, air flow can completely flow through the heat exchange air duct 10, and the heat exchange effect is improved.
In the above embodiment, the heat exchanger further includes a front heat exchanger 21, the front heat exchanger 21 is disposed in the heat exchange air duct 10, and the front heat exchanger 21 is located between the air inlet 11 and the inlet of the first reversing air duct 30. The air conditioner of the invention can initially reduce the temperature of the inlet airflow by arranging the front heat exchanger 21, thereby lowering the temperature of the final outlet airflow and improving the refrigeration effect.
In the above embodiment, there are a plurality of front heat exchangers 21, and the plurality of front heat exchangers 21 are arranged in the heat exchange air duct 10 at intervals. The air conditioner of the invention can further reduce the temperature of the inlet air flow by arranging a plurality of front heat exchangers 21, thereby further improving the refrigeration effect.
In the above embodiment, the first control valve 61 and the second control valve 62 are both electric wind shields, and by providing the electric wind shields, the flow surface of the first reversing air duct 30 can be shielded as required, so as to close the first reversing air duct 30, and the flow of the heat exchange air duct 10 can be fully blocked, so as to close the heat exchange air duct 10. The third control valve 63 and the fourth control valve 64 are air valves, and by adopting the air valves, the direction of the air flow can be changed and the size of the air flow can be adjusted when the air flow is reversed, so that the air flow reversing valve is multipurpose.
In the above embodiments, the air conditioner is an aircraft floor air conditioner. The air conditioner is an airplane ground air conditioner, three sections of reversing air ducts are added on a common multi-stage cooling straight air duct structure, air circulation paths are switched through the adjustment and control of an air valve and an electric wind shield, and air to be cooled is utilized to defrost a final-stage heat exchanger, so that defrosting is realized under the continuous refrigeration condition.
The air temperature is reduced to 33 ℃ which cannot be realized by a common refrigerating system, and generally, 3-5 stages of sectional cooling are adopted, and the evaporation temperature of each stage of heat exchanger is gradually reduced from front to back. The front-to-back three-stage heat exchangers are respectively named as: the invention is described by taking three-stage heat exchanger cooling as an example, if the cooling stage number in the system exceeds three stages, the last two stages are respectively used as an intermediate heat exchanger and a final stage heat exchanger, all the front heat exchangers are used as the front heat exchangers, the evaporation temperatures are respectively T1, T2 and T3, wherein T1 is T2 and T3, the air outlet temperature of the final stage heat exchanger is below 2 ℃, so that T3 can be generally reduced to below-3 ℃, T2 is generally 5-10 ℃, and T1 is generally 12-15 ℃. The problem of frost formation therefore only occurs in the final heat exchanger.
In order to solve the problem of frosting of the final stage heat exchanger, according to a second aspect of the present invention, there is disclosed a control method for controlling the above air conditioner, comprising the steps of:
s10: judging whether the final-stage heat exchanger 23 frosts;
s20: if yes, controlling the air conditioner to enter a defrosting mode; if not, controlling the air conditioner to enter a normal mode;
in the normal mode, the evaporation temperature of the intermediate heat exchanger 22 is controlled to be T2, the evaporation temperature of the final stage heat exchanger 23 is controlled to be T3, the first control valve 61 is switched to the first state, the second control valve 62 is switched to the third state, and the third control valve 63 is switched to the open state;
in the defrosting mode, the evaporation temperature of the final heat exchanger 23 is controlled to be T3, the evaporation temperature of the intermediate heat exchanger 22 is controlled to be T2, the first control valve 61 is switched to the second state, the second control valve 62 is switched to the fourth state, and the third control valve 63 is switched to the closed state; wherein T2> T3.
In the above embodiment, the air conditioner further includes the fourth control valve 64, the fourth control valve 64 is disposed in the third reversing air duct 50, the fourth control valve 64 has an open state and a closed state, and the step S20 further includes:
in the normal mode, the fourth control valve 64 is switched to the closed state;
in the defrosting mode, the fourth control valve 64 is switched to the open state.
According to the control method of the air conditioner, three sections of reversing air ducts are added on a common multi-stage cooling straight air duct structure, air circulation paths are switched through the adjustment and control of the air valves and the electric wind shields, and the air to be cooled is utilized to defrost the final-stage heat exchanger, so that defrosting is realized under the continuous refrigeration condition. In order to ensure that the refrigerating capacity of the whole refrigerating system cannot be attenuated, the evaporation temperature of the last-stage heat exchanger is increased while the air channel is reversed, the evaporation temperature of the middle heat exchanger is reduced, and the air outlet temperature is ensured to be stabilized in the design requirement.
As shown in fig. 1, the state in the air duct when the final heat exchanger 23 is not frosted, i.e., the normal mode, in which: the first control valve 61 closes the first reversing air duct 30 and opens the heat exchange air duct 10, the second control valve 62 closes the second reversing air duct 40 and opens the heat exchange air duct 10, the third control valve 63 opens, and the fourth control valve 64 closes. The inlet air passes through the heat exchange air channel 10 of the front heat exchanger 21, the middle heat exchanger 22, the third control valve 63 and the final heat exchanger 23 in sequence to gradually reduce the air temperature to below 2 ℃, which is consistent with the air channel of a common multi-stage cooling system, and the air volume in the air channel can be adjusted by controlling the third control valve 63.
Fig. 2 shows the state in the air duct after frosting of the final heat exchanger 23, i.e. the defrosting mode, wherein: the first control valve 61 opens the first reversing air duct 30 to close the heat exchange air duct 10, the second control valve 62 opens the second reversing air duct 40 to close the heat exchange air duct 10, the third control valve 63 closes, and the fourth control valve 64 opens. The inlet air passes through the front heat exchanger 21, the first reversing air duct 30, the final-stage heat exchanger 23, the second reversing air duct 40, the intermediate heat exchanger 22 and the third reversing air duct 50 in sequence, the fourth control valve 64 is used for supplying air, and the air quantity in the air ducts can be adjusted by controlling the fourth control valve 64.
Here, assuming that the air temperature Tf after passing through the front heat exchanger is T1, there is a relationship: tf > T1. When frosting of the final-stage heat exchanger is detected, the control valves in the air duct are switched, the evaporation temperature of the final-stage heat exchanger 23 is increased to T2, and the evaporation temperature of the intermediate heat exchanger 22 is reduced to T3.
Because the evaporation temperature of the final heat exchanger 23 rises to a value T2, and the air temperature at the inlet of the final heat exchanger 23 is Tf, the surface of the fin of the final heat exchanger 23 is heated to start defrosting, and meanwhile, the defrosting layer generates phase change heat absorption due to melting to enhance the heat exchange effect of the air side, so that the temperature of the air passing through the final heat exchanger 23 is further reduced.
The air passing through the final heat exchanger finally passes through the intermediate heat exchanger 22, and the total refrigerating capacity of the whole machine can be ensured to be not attenuated because the evaporation temperature of the intermediate heat exchanger 22 is reduced to T3, and the outlet air temperature can be always ensured to be below 2 ℃.
When the defrosting mode operates for a specified time T or meets the condition of exiting defrosting, the normal mode is switched back, meanwhile, the final-stage evaporation temperature is reduced to T3, and the evaporation temperature of the intermediate heat exchanger 22 is increased to T2, so that defrosting can be realized under the condition that the refrigerating capacity is not reduced under the continuous refrigerating state of the whole machine.
If the running time is too long in the defrosting mode and the intermediate heat exchanger 22 frosts, the frost layer of the intermediate heat exchanger 22 will also melt based on the same principle after the normal mode is switched back, and the adjustment of the capacity of the whole machine will not be affected.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the invention are covered by the protection scope of the invention.
Claims (9)
1. An air conditioner, comprising:
the heat exchange air duct (10), the heat exchange air duct (10) has an air inlet (11) and an air outlet (12);
a heat exchanger, the heat exchanger comprising: the intermediate heat exchanger (22) and the final heat exchanger (23), and the intermediate heat exchanger (22) and the final heat exchanger (23) are arranged at intervals along the direction from the air inlet (11) to the air outlet (12);
a first reversing air duct (30), wherein the first reversing air duct (30) is communicated with the heat exchange air duct (10), the inlet of the first reversing air duct (30) is positioned between the air inlet (11) and the intermediate heat exchanger (22), and the outlet of the first reversing air duct (30) is positioned between the intermediate heat exchanger (22) and the final heat exchanger (23);
a second reversing air duct (40), the second reversing air duct (40) being in communication with the heat exchange air duct (10), an inlet of the second reversing air duct (40) being located between the final heat exchanger (23) and the air outlet (12), an outlet of the second reversing air duct (40) being located between the intermediate heat exchanger (22) and the outlet of the first reversing air duct (30);
a third reversing air duct (50), wherein the third reversing air duct (50) is communicated with the heat exchange air duct (10), the inlet of the third reversing air duct (50) is positioned between the inlet of the first reversing air duct (30) and the intermediate heat exchanger (22), and the outlet of the third reversing air duct (50) is positioned between the final heat exchanger (23) and the air outlet (12);
a first control valve (61), the first control valve (61) being disposed at an inlet of the first reversing air duct (30), the first control valve (61) having a first state and a second state; in the first state, the first control valve (61) opens the heat exchange air duct (10) and closes the first reversing air duct (30); in the second state, the first control valve (61) closes the heat exchange air duct (10) and simultaneously opens the first reversing air duct (30);
a second control valve (62), the second control valve (62) disposed at an inlet of the second reversing air duct (40), the second control valve (62) having a third state and a fourth state; in the third state, the second control valve (62) opens the heat exchange air duct (10) and closes the second reversing air duct (40); in the fourth state, the second control valve (62) closes the heat exchange air duct (10) and simultaneously opens the second reversing air duct (40);
a third control valve (63), the third control valve (63) being disposed between the outlet of the first reversing air duct (30) and the outlet of the second reversing air duct (40), the third control valve (63) having an open state and a closed state.
2. The air conditioner according to claim 1, further comprising:
a fourth control valve (64), the fourth control valve (64) disposed within the third reversing air duct (50), the fourth control valve (64) having an open state and a closed state.
3. The air conditioner of claim 1, wherein the heat exchanger further comprises:
the front heat exchanger (21) is arranged in the heat exchange air duct (10), and the front heat exchanger (21) is positioned between the air inlet (11) and the inlet of the first reversing air duct (30).
4. The air conditioner according to claim 3,
the number of the front heat exchangers (21) is multiple, and the front heat exchangers (21) are arranged in the heat exchange air duct (10) at intervals.
5. The air conditioner according to claim 1,
the first control valve (61) and the second control valve (62) are both electric wind shields, and the third control valve (63) is a wind valve.
6. The air conditioner according to claim 2,
the fourth control valve (64) is an air valve.
7. The air conditioner according to claim 1,
the air conditioner is an airplane ground air conditioner.
8. A control method for controlling the air conditioner of any one of claims 1 to 7, characterized by comprising the steps of:
s10: judging whether the final-stage heat exchanger (23) frosts;
s20: if yes, controlling the air conditioner to enter a defrosting mode; if not, controlling the air conditioner to enter a normal mode;
in the normal mode, the intermediate heat exchanger (22) evaporation temperature is controlled to be T2, the final stage heat exchanger (23) evaporation temperature is controlled to be T3, the first control valve (61) is switched to a first state, the second control valve (62) is switched to a third state, and the third control valve (63) is switched to an open state;
in the defrosting mode, the last stage heat exchanger (23) evaporation temperature is controlled to be T3, the intermediate heat exchanger (22) evaporation temperature is controlled to be T2, the first control valve (61) is switched to a second state, the second control valve (62) is switched to a fourth state, and the third control valve (63) is switched to a closed state; wherein T2> T3.
9. The control method of claim 8, wherein the air conditioner further comprises a fourth control valve (64), the fourth control valve (64) being disposed within the third reversing duct (50), the fourth control valve (64) having an open state and a closed state, and further comprising, in step S20:
in the normal mode, the fourth control valve (64) is switched to a closed state;
in the defrosting mode, the fourth control valve (64) is switched to an open state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011492647.2A CN112503752A (en) | 2020-12-16 | 2020-12-16 | Air conditioner with variable air duct and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011492647.2A CN112503752A (en) | 2020-12-16 | 2020-12-16 | Air conditioner with variable air duct and control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113865199A (en) * | 2021-09-30 | 2021-12-31 | 珠海格力电器股份有限公司 | Refrigerator with a door |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113865199A (en) * | 2021-09-30 | 2021-12-31 | 珠海格力电器股份有限公司 | Refrigerator with a door |
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