CN112146299A - Air conditioner defrosting system and method - Google Patents
Air conditioner defrosting system and method Download PDFInfo
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- CN112146299A CN112146299A CN202011138572.8A CN202011138572A CN112146299A CN 112146299 A CN112146299 A CN 112146299A CN 202011138572 A CN202011138572 A CN 202011138572A CN 112146299 A CN112146299 A CN 112146299A
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- 238000010257 thawing Methods 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000003507 refrigerant Substances 0.000 claims abstract description 44
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000004378 air conditioning Methods 0.000 claims description 13
- 238000005057 refrigeration Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F24F11/42—Defrosting; Preventing freezing of outdoor units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A defrosting system and method for an air conditioner comprise a compressor, a four-way electromagnetic valve, a condenser, a throttling device, an evaporator and a connecting pipeline thereof, wherein the compressor is connected with the condenser, the throttling device and the evaporator through the four-way electromagnetic valve to form a refrigerant circulating system; the condenser is divided into n groups, n is a natural number larger than 1, one end of each group of condensers is connected with the output end of the compressor and the output end of the four-way electromagnetic valve through respective switch valves, and the other end of each group of condensers is connected with the two ends of the throttling device through respective switch valves. According to the invention, by optimizing the structure of the condenser system and the flow direction of the refrigerant, the outdoor unit condenser has a good defrosting effect in the winter heating process of the air source heat pump air conditioner, the air supply temperature of the indoor unit is kept, sudden temperature reduction or air supply stop is avoided, the comfort is good, and the winter heating performance of the air conditioner is improved.
Description
The technical field is as follows:
the invention belongs to the technical field of air conditioning, and particularly relates to an air conditioner defrosting system and an air conditioner defrosting method, which are applied to defrosting of an outdoor unit of an air source heat pump air conditioner and a water heater in the heating process in winter.
Background art:
the system structure principle of the existing air source heat pump air conditioner is shown in fig. 1, a compressor 1 is connected with a condenser 3, a throttling device 4 and an evaporator 5 through a four-way electromagnetic valve 2 to form a circulating system, a refrigerant flows in the circulating system, cooling and heating are realized through different states of the refrigerant in the condenser and the evaporator, the flow directions of the refrigerant during cooling and heating are opposite, and the flow direction of the refrigerant during heating and defrosting is the same as the cooling state.
When the air source heat pump air conditioner is used for heating and defrosting, the air conditioner is switched into a refrigeration mode through the four-way electromagnetic valve 2, and high-temperature and high-pressure gaseous refrigerant which originally flows to an indoor evaporator is reversed to flow to an outdoor condenser, so that frost on the condenser is melted; the phenomenon of incomplete defrosting is also possible, so that the frost on the condenser of the outdoor unit is thicker and thicker, the heat exchange efficiency is influenced, the energy consumption is increased, and the heating effect of the air conditioner is poor; therefore, defrosting of the air conditioner is a technical problem which always troubles heating of the air source heat pump air conditioner in winter.
The invention content is as follows:
the technical problem to be solved by the invention is as follows: the air-conditioning defrosting system and the air-conditioning defrosting method solve the problems in the prior art, and the condenser system structure and the refrigerant flow direction are optimized, so that the outdoor unit condenser defrosting effect is good in the winter heating process of the air-source heat pump air conditioner, the air supply temperature of the indoor unit is kept, sudden temperature reduction or air supply stopping is avoided, the comfort is good, and the winter heating performance of the air conditioner is improved.
The technical scheme adopted by the invention is as follows:
an air conditioner defrosting system comprises a compressor, a four-way electromagnetic valve, a condenser, a throttling device, an evaporator and a connecting pipeline thereof, wherein the compressor is connected with the condenser, the throttling device and the evaporator through the four-way electromagnetic valve to form a refrigerant circulating system; the condenser is divided into n groups, n is a natural number larger than 1, one end of each group of condensers is connected with the output end of the compressor and the output end of the four-way electromagnetic valve through respective switch valves, and the other end of each group of condensers is connected with the two ends of the throttling device through respective switch valves. When the air conditioner heats in winter, the refrigerant of one or more groups of condensers in the n groups of condensers flows in a reversing way by selectively controlling the switching state of each switching valve, so that defrosting is performed, and the flow direction of the refrigerant of the compressor, the four-way electromagnetic valve, the evaporator and the throttling device of the whole air conditioning system is unchanged and is still kept in the heating state in winter. Therefore, the condition that the air supply temperature of the evaporator, namely the indoor unit, is suddenly cooled or the air supply is stopped can not occur, and the problems of low heating efficiency and poor comfort of the air source heat pump air conditioner in winter for many years are solved. The invention divides the condenser into a plurality of condenser groups, correspondingly improves the efficiency of the condenser by a plurality of times, and also improves the refrigerating and heating efficiency of the air source heat pump air conditioner.
In the technical scheme, the input end and the output end of the compressor are respectively connected with two input ends of a four-way electromagnetic valve, one output end of the four-way electromagnetic valve is connected with one end of an evaporator, the other end of the evaporator is connected with one end of a throttling device, the other output end of the four-way electromagnetic valve is respectively connected with one end of n groups of condensers through a first group of n switch valves, and meanwhile, the compressed output end is also respectively connected with one end of the n groups of condensers directly through a second group of n switch valves; the other ends of the n groups of condensers are respectively connected with one end of the throttling device through a third group of n switch valves, and the other ends of the n groups of condensers are simultaneously connected with the other end of the throttling device through a fourth group of n switch valves.
In the technical scheme, the switch valves are electromagnetic valves, the n groups of condensers comprise a first group of condensers, a second group of condensers and an nth group of condensers, and the respective switch valves comprise electromagnetic valves 1-1, electromagnetic valves 2-1, electromagnetic valves n-1, electromagnetic valves 1-2, electromagnetic valves 2-2, electromagnetic valves n-2, electromagnetic valves 1-3, electromagnetic valves 2-3, electromagnetic valves n-3, electromagnetic valves 1-4, electromagnetic valves 2-4 and electromagnetic valves n-4; the connection structure of each group of condensers through respective switch valves is as follows:
one end of the first group of condensers is connected with the output end of the four-way electromagnetic valve through the electromagnetic valve 1-1 and is directly connected with the output end of the compressor through the electromagnetic valve 1-2; the other end of the first group of condensers is connected with one end of the throttling device through an electromagnetic valve 1-3 and is also connected with the other end of the throttling device through an electromagnetic valve 1-4;
one end of the second group of condensers is connected with the output end of the four-way electromagnetic valve through the electromagnetic valve 2-1 and is directly connected with the output end of the compressor through the electromagnetic valve 2-2; the other end of the second group of condensers is connected with one end of the throttling device through an electromagnetic valve 2-3 and is also connected with the other end of the throttling device through an electromagnetic valve 2-4;
one end of the nth group of condensers is connected with the output end of the four-way electromagnetic valve through an electromagnetic valve n-1 and is directly connected with the output end of the compressor through an electromagnetic valve n-2; the other end of the nth group of condensers is connected with one end of the throttling device through an electromagnetic valve n-3 and the other end of the throttling device through an electromagnetic valve n-4.
In the technical scheme, the input end and the output end of the compressor are respectively connected with the two input ends of the four-way electromagnetic valve, the two output ends of the four-way electromagnetic valve are respectively connected with one end of the evaporator and the electromagnetic valve 1-1, the electromagnetic valve 2-1 and the electromagnetic valve n-1, and the other end of the evaporator is connected with the throttling device.
An air conditioner defrosting method comprises a compressor, a four-way electromagnetic valve, a condenser, a throttling device, an evaporator and a connecting pipeline thereof, the compressor is connected with the condenser, the throttling device and the evaporator through the four-way electromagnetic valve to form a refrigerant circulating system, the condenser is divided into n groups, n is a natural number more than 1, the electromagnetic valve is additionally arranged on each group of the condenser to control the flow direction of the refrigerant, and forms an independent loop with the air-conditioning refrigerant circulating system to defrost a single group of condensers or multiple groups of condensers in n groups of condensers, not only has good defrosting effect, and the refrigerant of the refrigerant circulating system does not need to flow in a reversing way when the air conditioner heats and defrosts, so that an evaporator of the air conditioner, namely an indoor unit is always in a warm air supply state, and the problems of poor indoor comfort and low heating efficiency caused by sudden cooling or stopping air supply of the indoor unit due to defrosting of a condenser when the air conditioner heats in winter for many years are solved.
In the above technical scheme, each group of the condenser is respectively additionally provided with an electromagnetic valve for controlling the flow direction of the refrigerant, and the specific method comprises the following steps: one end of each group of condensers is connected with the output end of the compressor and the output end of the four-way electromagnetic valve through respective electromagnetic valves, and the other end of each group of condensers is connected with the two ends of the throttling device through respective electromagnetic valves.
In the above technical solution, the defrosting method of the single group of condensers includes: the electromagnetic valve connected with the output end of the compressor at one end of the condenser set is opened, the electromagnetic valve connected with the output end of the four-way electromagnetic valve at one end of the condenser set is closed, the electromagnetic valve connected with one end of the throttling device at the other end of the condenser set is opened, and the electromagnetic valve connected with the other end of the throttling device at the other end of the condenser set is closed, so that the refrigerant in the condenser set reversely flows for defrosting; and the electromagnetic valves connected with the output end of the compressor at one end of the other group of condensers are closed, the electromagnetic valves connected with the output end of the four-way electromagnetic valve at one end of the other group of condensers are opened, the electromagnetic valves connected with one end of the throttling device at the other end of the other group of condensers are closed, the electromagnetic valves connected with the other end of the throttling device at the other end of the other group of condensers are opened, and the refrigerant in the other group of condensers normally flows to maintain the heating of the.
In the above technical solution, the multiple groups of methods for defrosting simultaneously are: the electromagnetic valve connected with the output end of the compressor at one end of the multiple groups of condensers is opened, the electromagnetic valve connected with the output end of the four-way electromagnetic valve at one end of the multiple groups of condensers is closed, the electromagnetic valve connected with one end of the throttling device at the other end of the multiple groups of condensers is opened, the electromagnetic valve connected with the other end of the throttling device at the other end of the multiple groups of condensers is closed, and; and the electromagnetic valve connected with the output end of the compressor is closed at one end of the non-defrosting condenser group, the electromagnetic valve connected with the output end of the four-way electromagnetic valve is opened at one end of the non-defrosting condenser group, the electromagnetic valve connected with one end of the throttling device at the other end of the non-defrosting condenser group is closed, the electromagnetic valve connected with the other end of the throttling device at the other end of the non-defrosting condenser group is opened, and the refrigerant in the non-defrosting condenser group normally flows to maintain the heating of the air conditioning system.
In the above technical solution, in the multiple-unit simultaneous defrosting method, the solenoid valve of at least one set of condenser is left, and the on-off state of the solenoid valve does not perform the defrosting operation, and the normal flow of the refrigerant of the condenser is maintained to maintain the heating of the air conditioning system.
The invention divides the condenser of the existing air source heat pump air conditioner into a plurality of groups, each group is additionally provided with an electromagnetic valve for control, thereby changing the flow direction of the refrigerant in the condenser, and forming an independent loop with the air conditioner circulating system, so that part of the groups in the plurality of groups of condensers are in the defrosting working state, and other groups of condensers still maintain the normal flow direction of the refrigerant when the air conditioner heats except the defrosting condenser group, thus, the refrigerant of one part of the groups of condensers normally flows to carry out the heating working state, and the refrigerant of the other part of the groups of condensers reversely flows through the electromagnetic valve for control, thereby defrosting the condenser. Therefore, the invention divides the condensers into a plurality of groups, controls the flow direction of the refrigerant through a plurality of electromagnetic valves, and leads the condenser of the outdoor unit to defrost when the air conditioner heats in winter, and also keeps the evaporator of the indoor unit to normally supply warm air. The invention thoroughly changes the uncomfortable feeling that the indoor unit blows cold air or stops supplying air when the air conditioner defrosts the condenser in winter in the prior art, and the working efficiency of the condenser and the refrigerating and heating effects of the air conditioner are improved by the plurality of groups of condensers.
The invention divides the condenser into a plurality of groups, adopts a plurality of electromagnetic valves to control respectively, has simple structure, does not change the structure of the prior air-conditioning system, is easy to implement, and solves the technical problem of poor heating effect of the air-source heat pump air-conditioning system in winter for many years.
Description of the drawings:
FIG. 1 is a schematic diagram of a prior art structure;
FIG. 2 is a schematic view of the structure of the present invention.
The attached drawings are marked as follows:
1-compressor, 11-compressor input, 12-compressor output, 2-four-way solenoid valve, 21-four-way solenoid valve first input, 22-four-way solenoid valve second input, 23-four-way solenoid valve first output, 24-four-way solenoid valve second output, 3-evaporator, 4-throttling device, 4A-throttling device one end, 4B-throttling device another end, 5-condenser, 51-first group condenser, 52-second group condenser, 53-nth group condenser, 51A-first group condenser one end, 51B-first group condenser another end, 52A-second group condenser one end, 52B-second group condenser another end, 5 nA-nth group condenser one end, 53B-nth group condenser another end;
axle ← direction of refrigerant flow in air heating;
The specific implementation mode is as follows:
referring to fig. 2, the air conditioner defrosting system of the present invention includes a compressor 1, a four-way solenoid valve 2, a condenser 5, a throttling device 4, an evaporator 3 and a connecting pipeline thereof, wherein the compressor is connected with the condenser and the throttling device through the four-way solenoid valve, and the evaporator is connected to form a refrigerant circulation system; the condenser is divided into n groups, n is a natural number larger than 1, one end of each group of condensers is connected with the output end of the compressor and the output end of the four-way electromagnetic valve through respective switch valves, and the other end of each group of condensers is connected with the two ends of the throttling device through respective switch valves.
As shown in fig. 2, the input end 11 and the output end 12 of the compressor are respectively connected to two input ends 21 and 22 of the four-way solenoid valve, the first output end 23 of the four-way solenoid valve is connected to one end of the evaporator 3, the other end of the evaporator 3 is connected to one end 4A of the throttling device, the second output end 24 of the four-way solenoid valve is connected to one end of the n sets of condensers through the first set of n switching valves, meanwhile, the compressed output end is also directly connected to one end of the n sets of condensers through the second set of n switching valves, the other end 3 sets of n switching valves of the n sets of condensers are connected to one end 4A of the throttling device, and the n sets of condensers are simultaneously connected to the other end 4B of the throttling device.
The switch valves of the invention adopt electromagnetic valves, the n groups of condensers comprise a first group of condensers 51, a second group of condensers 52 and an nth group of condensers 53, and the respective switch valves comprise electromagnetic valves 1-1, 2-1, n-1, 1-2, 2-2, n-2, 1-3, 2-3, n-3, 1-4, 2-4 and n-4; the specific connection structure of each group of condensers through respective switch valves is as follows:
one end 51A of the first group of condensers 51 is connected with the second output end 24 of the four-way electromagnetic valve through the electromagnetic valve 1-1 and is directly connected with the output end 12 of the compressor through the electromagnetic valve 1-2; the other end 51B of the first group of condensers 51 is connected with one end 4A of the throttling device through the electromagnetic valves 1-3 and is connected with the other end 4B of the throttling device through the electromagnetic valves 1-4;
one end 52A of the second group of condensers 52 is connected with the second output end 24 of the four-way solenoid valve through the solenoid valve 2-1 and is directly connected with the output end 12 of the compressor through the solenoid valve 2-2; the other end 52B of the second group of condensers 52 is connected with one end 4A of the throttling device through an electromagnetic valve 2-3 and is connected with the other end 4B of the throttling device through an electromagnetic valve 2-4;
one end 53A of the nth group of condensers 53 is connected with the second output end 24 of the four-way electromagnetic valve through an electromagnetic valve n-1 and is directly connected with the output end 12 of the compressor through an electromagnetic valve n-2; the other end 53B of the nth group of condensers 53 is connected to both one end 4A of the throttling device through a solenoid valve n-3 and the other end 4B of the throttling device through a solenoid valve n-4.
The input end 11 and the output end 12 of the compressor are respectively connected with two input ends 21 and 22 of the four-way electromagnetic valve, two output ends 23 and 24 of the four-way electromagnetic valve are respectively connected with one end of the evaporator 3, the electromagnetic valve 1-1, the electromagnetic valve 2-1 and the electromagnetic valve n-1, and the other end of the evaporator is connected with one end 4A of the throttling device.
The invention relates to an air conditioner defrosting method, which comprises a compressor 1, four groups of electromagnetic valves 2, a condenser 5, a throttling device 4, an evaporator 3 and a connecting pipeline thereof, wherein the compressor 1 is connected with the condenser 5, the throttling device and the evaporator 3 through a four-way electromagnetic valve 2 to form a refrigerant circulating system.
Each group of condensers is respectively additionally provided with an electromagnetic valve for controlling the flow direction of the refrigerant, and the specific method comprises the following steps: one end of each group of condensers is respectively connected with the output end of the compressor and the output end of the four-way electromagnetic valve through respective electromagnetic valves, and the other end of each group of condensers is respectively connected with the two ends of the throttling device through respective electromagnetic valves.
The defrosting method of the single-group condenser comprises the following steps: the electromagnetic valve connected with the output end of the compressor at one end of the condenser set is opened, the electromagnetic valve connected with the output end of the four-way electromagnetic valve at one end of the condenser set is closed, the electromagnetic valve connected with one end 4A of the throttling device at the other end of the condenser set is opened, and the electromagnetic valve connected with the other end 4B of the throttling device at the other end of the condenser set is closed, so that the refrigerant in the condenser set reversely flows for defrosting; and the electromagnetic valves connected with the output end of the compressor at one end of the other group of condensers are closed, the electromagnetic valves connected with the output end of the four-way electromagnetic valve at one end of the other group of condensers are opened, the electromagnetic valves connected with one end 4A of the throttling device at the other end of the other group of condensers are closed, the electromagnetic valves connected with the other end 4B of the throttling device at the other end of the other group of condensers are opened, and the refrigerant in the other group of condensers normally flows to maintain the heating of the.
The method for defrosting simultaneously comprises the following steps: the electromagnetic valve connected with the output end of the compressor at one end of the multiple groups of condensers is opened, the electromagnetic valve connected with the output end of the four-way electromagnetic valve at one end of the multiple groups of condensers is closed, the electromagnetic valve connected with one end 4A of the throttling device at the other end of the multiple groups of condensers is opened, the electromagnetic valve connected with the other end 4B of the throttling device at the other end of the multiple groups of condensers is closed, and refrigerants in the multiple groups of condensers reversely flow to; and the electromagnetic valve connected with the output end of the compressor at one end of the non-defrosting condenser set is closed, the electromagnetic valve connected with the output end of the four-way electromagnetic valve at one end of the non-defrosting condenser set is opened, the electromagnetic valve connected with the throttling device at the other end of the non-defrosting condenser set 4A is closed, the electromagnetic valve connected with the throttling device at the other end of the non-defrosting condenser set 4B is opened, and refrigerant of the non-defrosting condenser set normally flows to maintain the heating of the air conditioning system.
Therefore, in the multi-group simultaneous defrosting method, the solenoid valve of at least one group of condensers is not in the on-off state, and the normal flow of the refrigerant of the condensers is maintained to maintain the heating of the air conditioning system.
Example 1:
as shown in fig. 2, the condensers are divided into 1, 2 and n groups, and during defrosting of the first group, the on-off states of the electromagnetic valves are as follows:
| solenoid valve numbering | 1-1 | 1-2 | 1-3 | 1-4 | 2-1 | 2-2 | 2-3 | 2-4 | n-1 | n-2 | n-3 | n-4 |
| During defrosting of the first group | Closing device | Opening device | Opening device | Closing device | Opening device | Closing device | Closing device | Opening device | Opening device | Closing device | Closing device | Opening device |
Example 2:
as shown in fig. 2, the condensers are divided into 1, 2 and n groups, and during defrosting in the second group, the on-off states of the electromagnetic valves are as follows:
| solenoid valve numbering | 1-1 | 1-2 | 1-3 | 1-4 | 2-1 | 2-2 | 2-3 | 2-4 | n-1 | n-2 | n-3 | n-4 |
| During defrosting of the second group | Opening device | Closing device | Closing device | Opening device | Closing device | Opening device | Opening device | Closing device | Opening device | Closing device | Closing device | Opening device |
Example 3:
as shown in fig. 2, the condensers are divided into 1, 2, and n groups, and when defrosting is performed in the nth group, the solenoid valves are switched as follows:
| solenoid valve numbering | 1-1 | 1-2 | 1-3 | 1-4 | 2-1 | 2-2 | 2-3 | 2-4 | n-1 | n-2 | n-3 | n-4 |
| During defrosting of group n | Opening device | Closing device | Closing device | Opening device | Opening device | Closing device | Closing device | Opening device | Closing device | Opening device | Opening device | Closing device |
Example 4:
as shown in fig. 2, the condensers are divided into 1, 2, and n groups, and during defrosting of the first and second groups, the on-off states of the electromagnetic valves are as follows:
| solenoid valve numbering | 1-1 | 1-2 | 1-3 | 1-4 | 2-1 | 2-2 | 2-3 | 2-4 | n-1 | n-2 | n-3 | n-4 |
| During defrosting of the first and second groups | Closing device | Opening device | Opening device | Closing device | Closing device | Opening device | Opening device | Closing device | Opening device | Closing device | Closing device | Opening device |
Example 5:
as shown in fig. 2, when the condensers are divided into 1, 2, and n groups, and the second and n groups defrost, the solenoid valves are switched as follows:
| solenoid valve numbering | 1-1 | 1-2 | 1-3 | 1-4 | 2-1 | 2-2 | 2-3 | 2-4 | n-1 | n-2 | n-3 | n-4 |
| During defrosting of the second and third groups | Opening device | Closing device | Closing device | Opening device | Closing device | Opening device | Opening device | Closing device | Closing device | Opening device | Opening device | Closing device |
Example 6:
as shown in fig. 2, the condensers are divided into 1, 2, and n groups, and when the first and n groups defrost, the solenoid valves are switched as follows:
| solenoid valve numbering | 1-1 | 1-2 | 1-3 | 1-4 | 2-1 | 2-2 | 2-3 | 2-4 | n-1 | n-2 | n-3 | n-4 |
| During defrosting of the first and third groups | Opening device | Closing device | Closing device | Opening device | Closing device | Opening device | Opening device | Closing device | Closing device | Opening device | Opening device | Closing device |
Claims (9)
1. An air conditioner defrost system characterized in that: the system comprises a compressor, a four-way electromagnetic valve, a condenser, a throttling device, an evaporator and a connecting pipeline thereof, wherein the compressor is connected with the condenser, the throttling device and the evaporator through the four-way electromagnetic valve to form a refrigerant circulating system; the condenser is divided into n groups, n is a natural number larger than 1, one end of each group of condensers is connected with the output end of the compressor and the output end of the four-way electromagnetic valve through respective switch valves, and the other end of each group of condensers is connected with the two ends of the throttling device through respective switch valves.
2. An air conditioner defrost system as in claim 1 wherein: the input end and the output end of the compressor are respectively connected with two input ends of a four-way electromagnetic valve, one output end of the four-way electromagnetic valve is connected with one end of an evaporator, the other end of the evaporator is connected with one end of a throttling device, the other output end of the four-way electromagnetic valve is respectively connected with one end of n groups of condensers through a first group of n switch valves, and meanwhile, the compressed output end is also respectively connected with one end of the n groups of condensers directly through a second group of n switch valves; the other ends of the n groups of condensers are respectively connected with one end of the throttling device through a third group of n switch valves, and the other ends of the n groups of condensers are simultaneously connected with the other end of the throttling device through a fourth group of n switch valves.
3. An air conditioner defrost system as in claim 1 wherein: the switch valves adopt electromagnetic valves, the n groups of condensers comprise a first group of condensers, a second group of condensers and an nth group of condensers, and the respective switch valves comprise electromagnetic valves 1-1, 2-1, n-1, 1-2, 2-2, n-2, 1-3, 2-3, n-3, 1-4, 2-4 and n-4; the connection structure of each group of condensers through respective switch valves is as follows:
one end of the first group of condensers is connected with the output end of the four-way electromagnetic valve through the electromagnetic valve 1-1 and is directly connected with the output end of the compressor through the electromagnetic valve 1-2; the other end of the first group of condensers is connected with one end of the throttling device through an electromagnetic valve 1-3 and is also connected with the other end of the throttling device through an electromagnetic valve 1-4;
one end of the second group of condensers is connected with the output end of the four-way electromagnetic valve through the electromagnetic valve 2-1 and is directly connected with the output end of the compressor through the electromagnetic valve 2-2; the other end of the second group of condensers is connected with one end of the throttling device through an electromagnetic valve 2-3 and is also connected with the other end of the throttling device through an electromagnetic valve 2-4;
one end of the nth group of condensers is connected with the output end of the four-way electromagnetic valve through an electromagnetic valve n-1 and is directly connected with the output end of the compressor through an electromagnetic valve n-2; the other end of the nth group of condensers is connected with one end of the throttling device through an electromagnetic valve n-3 and the other end of the throttling device through an electromagnetic valve n-4.
4. An air conditioner defrost system as in claim 3 wherein: the input end and the output end of the compressor are respectively connected with two input ends of a four-way electromagnetic valve, two output ends of the four-way electromagnetic valve are respectively connected with one end of the evaporator and the electromagnetic valve 1-1, the electromagnetic valve 2-1 and the electromagnetic valve n-1, and the other end of the evaporator is connected with a throttling device.
5. An air conditioner defrosting method is characterized in that: the invention relates to a refrigeration system, which comprises a compressor, a four-way electromagnetic valve, a condenser, a throttling device, an evaporator and a connecting pipeline thereof, wherein the compressor is connected with the condenser, the throttling device and the evaporator through the four-way electromagnetic valve to form a refrigerant circulating system.
6. The defrosting method of an air conditioner according to claim 5, wherein: each group of the condensers is respectively additionally provided with an electromagnetic valve for controlling the flow direction of the refrigerant, and the specific method comprises the following steps: one end of each group of condensers is connected with the output end of the compressor and the output end of the four-way electromagnetic valve through respective electromagnetic valves, and the other end of each group of condensers is connected with the two ends of the throttling device through respective electromagnetic valves.
7. The defrosting method of an air conditioner according to claim 5, wherein: the defrosting method of the single-group condenser comprises the following steps: the electromagnetic valve connected with the output end of the compressor at one end of the condenser set is opened, the electromagnetic valve connected with the output end of the four-way electromagnetic valve at one end of the condenser set is closed, the electromagnetic valve connected with one end of the throttling device at the other end of the condenser set is opened, and the electromagnetic valve connected with the other end of the throttling device at the other end of the condenser set is closed, so that the refrigerant in the condenser set reversely flows for defrosting; and the electromagnetic valves connected with the output end of the compressor at one end of the other group of condensers are closed, the electromagnetic valves connected with the output end of the four-way electromagnetic valve at one end of the other group of condensers are opened, the electromagnetic valves connected with one end of the throttling device at the other end of the other group of condensers are closed, the electromagnetic valves connected with the other end of the throttling device at the other end of the other group of condensers are opened, and the refrigerant in the other group of condensers normally flows to maintain the heating of the.
8. The defrosting method of an air conditioner according to claim 5, wherein: the method for defrosting the multiple groups simultaneously comprises the following steps: the electromagnetic valve connected with the output end of the compressor at one end of the multiple groups of condensers is opened, the electromagnetic valve connected with the output end of the four-way electromagnetic valve at one end of the multiple groups of condensers is closed, the electromagnetic valve connected with one end of the throttling device at the other end of the multiple groups of condensers is opened, the electromagnetic valve connected with the other end of the throttling device at the other end of the multiple groups of condensers is closed, and; and the electromagnetic valve connected with the output end of the compressor is closed at one end of the non-defrosting condenser group, the electromagnetic valve connected with the output end of the four-way electromagnetic valve is opened at one end of the non-defrosting condenser group, the electromagnetic valve connected with one end of the throttling device at the other end of the non-defrosting condenser group is closed, the electromagnetic valve connected with the other end of the throttling device at the other end of the non-defrosting condenser group is opened, and the refrigerant in the non-defrosting condenser group normally flows to maintain the heating of the air conditioning system.
9. The defrosting method of an air conditioner according to claim 5, wherein: in the multi-group simultaneous defrosting method, the on-off state of the electromagnetic valve of at least one group of condensers is not subjected to defrosting operation, and the normal flow of the refrigerant of the condensers is still maintained to maintain the heating of the air conditioning system.
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| CN101382351A (en) * | 2008-10-21 | 2009-03-11 | 中南大学 | Air source heat pump air conditioner and defrosting method thereof |
| CN104748466A (en) * | 2013-12-31 | 2015-07-01 | 周海瑞 | Air source heat pump defrosting system |
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