CN110595094A - Air conditioning system - Google Patents
Air conditioning system Download PDFInfo
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- CN110595094A CN110595094A CN201910948385.7A CN201910948385A CN110595094A CN 110595094 A CN110595094 A CN 110595094A CN 201910948385 A CN201910948385 A CN 201910948385A CN 110595094 A CN110595094 A CN 110595094A
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- Prior art keywords
- valve
- heat exchange
- exchange device
- outdoor heat
- pipeline
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Classifications
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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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- 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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/04—Refrigeration circuit bypassing means
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention discloses an air conditioning system, which comprises a refrigerant circulation main loop, a refrigerant circulation main loop and a refrigerant circulation control loop, wherein the refrigerant circulation main loop is formed by connecting a compressor, a four-way reversing valve, an indoor heat exchange device, an outdoor heat exchange device and a throttling component through pipelines; the exhaust end of a connecting pipeline or a compressor among the four-way reversing valve, the indoor heat exchange device and the throttling part is connected to one end of the outdoor heat exchange device through a first electromagnetic valve and at least one pipeline; the other end of the outdoor heat exchange device is connected with one end of the second electromagnetic valve through a branch pipeline, a third electromagnetic valve is arranged on a main pipeline between the outdoor heat exchange device and the four-way reversing valve, and the other end of the second electromagnetic valve is connected on the main pipeline between the third electromagnetic valve and the four-way reversing valve through a branch pipeline. The air conditioning system provided by the embodiment of the invention optimizes the system structure, does not need to switch the four-way valve during defrosting, and can ensure that the indoor unit continuously blows hot air to meet the heat supply requirement and improve the use comfort of users.
Description
Technical Field
The invention relates to the technical field of air conditioning, in particular to an air conditioning system.
Background
In severe cold weather, the outdoor unit of the air conditioner begins to frost after operation is performed for a short time, and the outdoor unit frosts more and more along with the extension of the operation time, so that the heating effect of the air conditioner is poor, the air conditioner needs to enter a defrosting stage, hot air is not blown out to the indoor during the defrosting process, the air conditioner operates the heating mode again only after the defrosting is finished, then frosting is performed again, defrosting is performed again and circulates continuously, and thus frequent defrosting operation causes intermittent heat supply of the air conditioner, the comfortable temperature required by a human body is difficult to reach, the comfort level is poor, and the air conditioner cannot operate even below-20 ℃.
In the research of the prior art, the inventor of the invention finds that when the air conditioner defrosts, the compressor is subjected to the processes of stopping, starting, stopping and starting, and the defrosting is realized by switching the four-way valve to a refrigeration mode, so that the indoor air outlet temperature is directly influenced, and the comfort level is greatly reduced.
Disclosure of Invention
The invention provides an air conditioning system, which aims to solve the technical problem that the heating capacity is insufficient due to frequent defrosting of the existing air conditioner in a low-temperature environment.
In order to solve the technical problem, an embodiment of the present invention provides an air conditioning system, including a refrigerant circulation main loop formed by connecting a compressor, a four-way reversing valve, an indoor heat exchanging device, an outdoor heat exchanging device, and a throttling component through a pipeline;
the four-way reversing valve, the indoor heat exchange device, a connecting pipeline between the throttling parts or the exhaust end of the compressor are connected to one end of the outdoor heat exchange device through a first electromagnetic valve and at least one pipeline;
the other end of the outdoor heat exchange device is connected with one end of the second electromagnetic valve through a branch pipeline, a third electromagnetic valve is arranged on a main pipeline between the outdoor heat exchange device and the four-way reversing valve, and the other end of the second electromagnetic valve is connected on the main pipeline between the third electromagnetic valve and the four-way reversing valve through a branch pipeline.
Preferably, in the main refrigerant circulation loop, an exhaust end of the compressor is connected to a first end of the four-way reversing valve, a second end of the four-way reversing valve is connected to one end of the indoor heat exchanging device, the other end of the indoor heat exchanging device is connected to one end of the throttling component, the other end of the throttling component is connected to the other end of the outdoor heat exchanging device,
one end of the outdoor heat exchange device is connected with one end of the third electromagnetic valve, and the other end of the third electromagnetic valve and the other end of the second electromagnetic valve are respectively connected with the fourth end of the four-way reversing valve.
Preferably, a connecting pipeline between the four-way reversing valve and the indoor heat exchange device is connected to one end of the outdoor heat exchange device through a first pipeline and the first electromagnetic valve;
the first electromagnetic valve is arranged on the first pipeline, one end of the first pipeline is connected to a main pipeline between the second end of the four-way reversing valve and the indoor heat exchange device, and the other end of the first pipeline is connected to one end of the outdoor heat exchange device.
Preferably, a connecting pipeline between the indoor heat exchange device and the throttling component is connected to one end of the outdoor heat exchange device through a second pipeline and the first electromagnetic valve;
wherein the first solenoid valve is disposed on the first pipe, one end of the second pipe is connected to a main pipe between the indoor heat exchanging apparatus and the throttling part, and the other end of the second pipe is connected to one end of the outdoor heat exchanging apparatus.
Preferably, the discharge end of the compressor is connected to one end of the outdoor heat exchange device through a third pipeline and the first electromagnetic valve;
wherein the first solenoid valve is disposed on the third pipeline, one end of the third pipeline is connected to a main path pipe between a discharge end of the compressor and a first end of the four-way reversing valve, and the other end of the third pipeline is connected to one end of the outdoor heat exchanging apparatus.
Preferably, a connection pipe between the four-way reversing valve and the indoor heat exchange device is connected to one end of the first electromagnetic valve through a first pipe, the other end of the first electromagnetic valve is connected to one end of the outdoor heat exchange device, and the connection pipe between the indoor heat exchange device and the throttling component is connected to one end of the first electromagnetic valve through a second pipe.
Preferably, a first stop valve is arranged on a main pipeline between the four-way reversing valve and the indoor heat exchange device, and a second stop valve is arranged on a main pipeline between the indoor heat exchange device and the throttling component.
Preferably, the air conditioner further comprises a controller, and the controller is electrically connected with the compressor, the four-way reversing valve, the indoor heat exchange device, the outdoor heat exchange device, the throttling component, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve respectively.
Preferably, when the third electromagnetic valve operates in a defrosting mode, the connecting pipeline between the four-way reversing valve and the outdoor heat exchange device is cut off;
a part of refrigerant output by the exhaust end of the compressor flows back to the compressor along the four-way reversing valve, the indoor heat exchange device, the throttling component, the second electromagnetic valve, the four-way reversing valve and the air return end of the compressor in sequence;
and the other part of the refrigerant output by the exhaust end of the compressor sequentially flows back to the compressor along the first electromagnetic valve, the outdoor heat exchange device, the second electromagnetic valve, the four-way reversing valve and the air return end of the compressor.
Preferably, when the third electromagnetic valve operates in a normal heating mode, the third electromagnetic valve conducts a connecting pipeline between the four-way reversing valve and the outdoor heat exchange device;
the refrigerant output by the exhaust end of the compressor flows back to the compressor along the four-way reversing valve, the indoor heat exchange device, the throttling component, the outdoor heat exchange device, the four-way reversing valve and the air return end of the compressor in sequence.
The embodiment of the invention has the following beneficial effects:
(1) by setting a bypass loop for defrosting:
the refrigerant circulation main loop is provided with a bypass loop by connecting the four-way reversing valve, the indoor heat exchange device, a connecting pipeline between the throttling parts or the exhaust end of the compressor to one end of the outdoor heat exchange device through at least one pipeline and a first electromagnetic valve, so that part of refrigerant with higher temperature is used for defrosting of the outdoor heat exchange device.
(2) The four-way reversing valve does not need to be switched, the compressor does not need to be frequently started and stopped, and the continuous heat supply of the indoor heat exchange device is ensured:
when defrosting of the outdoor heat exchange device is needed under low temperature conditions, the four-way reversing valve does not need to be switched, the compressor does not need to be started or stopped, the heating mode does not need to be switched to the refrigerating mode, at the moment, the evaporation heat absorption function of the outdoor heat exchange device is stopped, the connecting pipeline between the four-way reversing valve and the outdoor heat exchange device is cut off through the third electromagnetic valve, then a bypass loop inputs a part of refrigerant with higher temperature in a refrigerant circulation main loop into the outdoor heat exchange device from one end of the outdoor heat exchange device, and the refrigerant flowing out of the other end of the outdoor heat exchange device flows back into the compressor through the second electromagnetic valve and the four-way reversing valve, so that the temperature of the outdoor heat exchange device is improved, and the purpose of rapid defrosting is achieved.
(3) The pipeline design of the bypass loop is flexible:
according to the conditions of temperature, flow and the like of a refrigerant required by the outdoor heat exchange device during defrosting, a connecting pipeline between the four-way reversing valve and the indoor heat exchange device can be connected to one end of the outdoor heat exchange device through a pipeline and the first electromagnetic valve;
a connecting pipeline between the indoor heat exchange device and the throttling component can also be connected to one end of the outdoor heat exchange device through a pipeline and the first electromagnetic valve;
the exhaust end of the compressor can be connected to one end of the outdoor heat exchange device through a pipeline and the first electromagnetic valve;
of course, the above three pipes or two of them can be designed in combination.
(4) The control is simple, and the improvement cost is low:
the bypass loop is constructed through the three electromagnetic valves, continuous heating of the indoor unit is achieved under the conditions that the four-way reversing valve is not required to be switched and the heating mode is changed, hot air can be blown out even during defrosting, the heating requirement is met, the use comfort of a user is improved, path switching of a refrigerant is achieved only through the three electromagnetic valves, the heat of the refrigerant is effectively utilized for defrosting, the control is simple, and the improvement cost is low.
Drawings
Fig. 1 is a schematic configuration diagram of an air conditioning system according to a first embodiment of the present invention;
fig. 2 is a refrigerant flow path diagram of a normal heating mode of the air conditioning system according to the first embodiment of the present invention;
fig. 3 is a refrigerant flow path diagram of a defrosting mode of the air conditioning system according to the first embodiment of the present invention;
fig. 4 is a schematic configuration diagram of an air conditioning system according to a second embodiment of the present invention;
fig. 5 is a refrigerant flow path diagram of a normal heating mode of the air conditioning system according to the second embodiment of the present invention;
fig. 6 is a refrigerant flow path diagram of a defrosting mode of an air conditioning system according to a second embodiment of the present invention;
fig. 7 is a schematic diagram of an air conditioning system of the first/second embodiment of the present invention;
wherein the reference numbers in the drawings of the specification are as follows:
1. a compressor; 2. a four-way reversing valve; 3. an indoor heat exchange device; 4. a throttling member; 5. an outdoor heat exchange device;
6. a first solenoid valve; 7. a second solenoid valve; 8. a third electromagnetic valve;
9. a first shut-off valve; 10. a second shut-off valve.
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.
The first embodiment of the present invention:
referring to fig. 1, a first embodiment of the present invention provides an air conditioning system, which includes a refrigerant circulation main loop formed by connecting a compressor 1, a four-way reversing valve 2, an indoor heat exchange device 3, an outdoor heat exchange device 5, and a throttling component 4 through a pipeline;
a connecting pipeline among the four-way reversing valve 2, the indoor heat exchange device 3 and the throttling component 4 is connected to one end of the outdoor heat exchange device 5 through at least one pipeline and a first electromagnetic valve 6;
the other end of the outdoor heat exchange device 5 is connected with one end of a second electromagnetic valve 7 through a branch pipeline, a third electromagnetic valve 8 is arranged on a main pipeline between the outdoor heat exchange device 5 and the four-way reversing valve 2, and the other end of the second electromagnetic valve 7 is connected to a main pipeline between the third electromagnetic valve 8 and the four-way reversing valve 2 through a branch pipeline.
Of course, in order to design the system structure more reasonably, a first stop valve 9 may be provided on a connection pipe between the four-way reversing valve 2 and the indoor heat exchange device 3; and a second stop valve 10 is arranged on a connecting pipeline between the indoor heat exchange device 3 and the throttling component 4.
It is understood that the air conditioning system further includes a controller electrically connected to the compressor 1, the four-way selector valve 2, the indoor heat exchanging device 3, the outdoor heat exchanging device 5, the throttling part 4, the first solenoid valve 6, the second solenoid valve 7, and the third solenoid valve 8, respectively. The throttling means 4 includes, but is not limited to, an electronic expansion valve. When the air conditioning system operates in the heating mode, the indoor heat exchange device 3 functions as a condenser to realize a condensation heat release principle, and the outdoor heat exchange device 5 functions as an evaporator to realize an evaporation heat absorption principle, so that the outdoor heat exchange device 5 is easily frosted under a low temperature condition.
In this embodiment, in the refrigerant circulation main circuit, the exhaust end of the compressor 1 is connected to the first end of the four-way reversing valve 2, the second end of the four-way reversing valve 2 is connected to one end of the indoor heat exchange device 3, the other end of the indoor heat exchange device 3 is connected to one end of the throttling component 4, the other end of the throttling component 4 is connected to the other end of the outdoor heat exchange device 5, one end of the outdoor heat exchange device 5 is connected to one end of the third electromagnetic valve 8, and the other ends of the third electromagnetic valve 8 and the second electromagnetic valve 7 are respectively connected to the fourth end of the four-way reversing valve 2.
The first electromagnetic valve 6 is a normally closed valve for controlling whether the refrigerant of the bypass loop can enter the outdoor heat exchange device 5, if a plurality of pipelines are connected with the first electromagnetic valve 6, the exhaust refrigerant and the waste heat refrigerant with higher temperature can be gathered and then enter the outdoor heat exchange device 5 together, so as to accelerate defrosting of the outdoor heat exchange device 5, and meanwhile, the indoor heat exchange device 3 is ensured to continuously blow hot air indoors, so that the heat supply requirement is met, the use comfort of a user is improved, and the specific connection mode is as shown in fig. 1, and the following two types are provided:
firstly, a connecting pipeline between the four-way reversing valve 2 and the indoor heat exchange device 3 is connected to one end of the outdoor heat exchange device 5 through a first pipeline and the first electromagnetic valve 6; wherein the first solenoid valve 6 is disposed on the first pipeline, one end of the first pipeline is connected to a main pipeline between the second end of the four-way reversing valve 2 and the indoor heat exchange device 3, and the other end of the first pipeline is connected to one end of the outdoor heat exchange device 5.
Secondly, a connecting pipeline between the indoor heat exchange device 3 and the throttling component 4 is connected to one end of the outdoor heat exchange device 5 through a second pipeline and the first electromagnetic valve 6; wherein the first electromagnetic valve 6 is provided on the first pipe, one end of the second pipe is connected to a main pipe between the indoor heat exchange device 3 and the throttling part 4, and the other end of the second pipe is connected to one end of the outdoor heat exchange device 5.
The second electromagnetic valve 7 is a normally closed valve, and is configured to control a flow rate of the refrigerant/refrigerant flowing back to the compressor 1 to increase a system resistance, and the temperature of the refrigerant/refrigerant entering the outdoor heat exchange device 5 can be effectively increased by controlling the flow rate.
The third electromagnetic valve 8 is a normally open valve and is used for controlling the disconnection and the opening of a pipeline between the four-way reversing valve 2 and the outdoor heat exchange device 5.
The working principle of the embodiment is described as follows:
in the normal heating mode, as shown in fig. 2, the third electromagnetic valve 8 conducts the connecting pipeline between the four-way reversing valve 2 and the outdoor heat exchange device 5;
and a part of refrigerant output by the exhaust end of the compressor 1 sequentially flows back to the compressor 1 along the four-way reversing valve 2, the indoor heat exchange device 3, the throttling component 4, the outdoor heat exchange device 5, the four-way reversing valve 2 and the air return end of the compressor 1.
When the low-temperature area or the ultra-low-temperature area reaches the defrosting condition, as shown in fig. 3 and 7, the controller judges whether the defrosting condition is reached, when the defrosting condition is reached, the compressor starts to increase the frequency, the first electromagnetic valve 6, the second electromagnetic valve 7 and the third electromagnetic valve 8 operate, wherein the first electromagnetic valve 6 and the second electromagnetic valve 7 are controlled to be conducted, the third electromagnetic valve 8 is closed, the third electromagnetic valve 8 is in a non-conduction state, the outdoor heat exchange device 5 stops evaporating and absorbing heat, so that the refrigerant in the bypass loop heats the outdoor heat exchange device 5 to increase the temperature, and the frost is melted after being heated.
In this way, the connecting pipeline between the four-way reversing valve 2 and the outdoor heat exchange device 5 is cut off when the third electromagnetic valve 8 operates in the defrosting mode;
part of refrigerant output by the exhaust end of the compressor 1 sequentially flows back to the compressor 1 along the four-way reversing valve 2, the indoor heat exchange device 3, the throttling component 4, the second electromagnetic valve 7, the four-way reversing valve and the air return end of the compressor 1;
another part of the refrigerant output by the exhaust end of the compressor 1 sequentially flows back to the compressor 1 along the first electromagnetic valve 6, the outdoor heat exchange device 5, the second electromagnetic valve 7, the four-way reversing valve 2 and the air return end of the compressor 1.
And after the defrosting condition is quitted, the first electromagnetic valve 6 and the second electromagnetic valve 7 are controlled to be closed, and the third electromagnetic valve 8 is controlled to be conducted, so that the system operation is switched into a normal heating system mode, and the four-way reversing valve 2 is not reversed and is in a heating state.
The second electromagnetic valve 7 is operated and switched on to control the refrigerant/refrigerant of the outdoor heat exchange device 5 to flow back to the compressor 1 along the second electromagnetic valve 7, the four-way reversing valve 2 and the gas return end of the compressor 1, and the refrigerant/refrigerant returns to the compressor 1 through the second electromagnetic valve 2 after heat exchange of the outdoor heat exchange device 5, so that a closed loop (bypass loop) is formed, and a small part of high-temperature gas discharged by the compressor 1 can flow to the outdoor heat exchange device 5 to achieve rapid defrosting.
In addition, when the defrosting mode is operated, the high-temperature exhaust refrigerant of the compressor 1 still flows to the indoor heat exchange device 3 through the four-way reversing valve 2, so that the indoor heat exchange device 3 can still continue to heat during defrosting, hot air is continuously blown indoors, indoor heat supply requirements are met, and the use comfort of users is improved.
According to the embodiment, the defrosting time can be effectively shortened through the structural design and the corresponding control steps of the embodiment, and according to test data, the 2-minute defrosting technology can be realized through the scheme of the embodiment.
In addition, referring to fig. 1 to 3, as a further preferable solution, a connection pipeline between the four-way reversing valve 2, the indoor heat exchange device 3, and the throttling component 4 is connected to one end of the outdoor heat exchange device 5 through at least one pipeline and a first electromagnetic valve 6, so as to form an input path of a bypass circuit, and the following three options are provided:
first, the first electromagnetic valve 6 is connected to one end of the outdoor heat exchange device 5 through the first pipeline alone;
secondly, the first electromagnetic valve 6 is connected to one end of the outdoor heat exchange device 5 through the second pipeline alone;
thirdly, the first pipeline, the second pipeline and the first electromagnetic valve 6 are used for constructing two input paths of the bypass circuit, and the first electromagnetic valve 6 collects the refrigerants of the two paths into the outdoor heat exchange device 5 to realize temperature rise and defrosting.
Second embodiment of the invention:
referring to fig. 4, a first embodiment of the present invention provides an air conditioning system, which includes a refrigerant circulation main loop formed by connecting a compressor 1, a four-way reversing valve 2, an indoor heat exchange device 3, an outdoor heat exchange device 5, and a throttling component 4 through a pipeline;
in distinction to the first embodiment, the second embodiment of the present invention is that the discharge end of the compressor 1 is connected to one end of the outdoor heat exchanging means 5 through at least one pipe, a first solenoid valve 6;
the other end of the outdoor heat exchange device 5 is connected with one end of a second electromagnetic valve 7 through a branch pipeline, a third electromagnetic valve 8 is arranged on a main pipeline between the outdoor heat exchange device 5 and the four-way reversing valve 2, and the other end of the second electromagnetic valve 7 is connected to a main pipeline between the third electromagnetic valve 8 and the four-way reversing valve 2 through a branch pipeline.
Of course, in order to design the system structure more reasonably, a first stop valve 9 may be provided on a connection pipe between the four-way reversing valve 2 and the indoor heat exchange device 3; and a second stop valve 10 is arranged on a connecting pipeline between the indoor heat exchange device 3 and the throttling component 4.
It is understood that the air conditioning system further includes a controller electrically connected to the compressor 1, the four-way selector valve 2, the indoor heat exchanging device 3, the outdoor heat exchanging device 5, the throttling part 4, the first solenoid valve 6, the second solenoid valve 7, and the third solenoid valve 8, respectively. The throttling means 4 includes, but is not limited to, an electronic expansion valve. When the air conditioning system operates in the heating mode, the indoor heat exchange device 3 functions as a condenser to realize a condensation heat release principle, and the outdoor heat exchange device 5 functions as an evaporator to realize an evaporation heat absorption principle, so that the outdoor heat exchange device 5 is easily frosted under a low temperature condition.
In this embodiment, in the refrigerant circulation main circuit, the exhaust end of the compressor 1 is connected to the first end of the four-way reversing valve 2, the second end of the four-way reversing valve 2 is connected to one end of the indoor heat exchange device 3, the other end of the indoor heat exchange device 3 is connected to one end of the throttling component 4, the other end of the throttling component 4 is connected to the other end of the outdoor heat exchange device 5, one end of the outdoor heat exchange device 5 is connected to one end of the third electromagnetic valve 8, and the other ends of the third electromagnetic valve 8 and the second electromagnetic valve 7 are respectively connected to the fourth end of the four-way reversing valve 2.
The first electromagnetic valve 6 is a normally closed valve for controlling whether the refrigerant of the bypass loop can enter the outdoor heat exchange device 5, if a plurality of pipelines are connected with the first electromagnetic valve 6, the exhaust refrigerant and the waste heat refrigerant with higher temperature can be gathered and then enter the outdoor heat exchange device 5 together, so as to accelerate defrosting of the outdoor heat exchange device 5, and meanwhile, the indoor heat exchange device 3 is ensured to continuously blow hot air indoors, so that the heat supply requirement is met, the use comfort of a user is improved, and the specific connection mode is as shown in fig. 1, and the following two types are provided:
firstly, a connecting pipeline between the four-way reversing valve 2 and the indoor heat exchange device 3 is connected to one end of the outdoor heat exchange device 5 through a first pipeline and the first electromagnetic valve 6; wherein the first solenoid valve 6 is disposed on the first pipeline, one end of the first pipeline is connected to a main pipeline between the second end of the four-way reversing valve 2 and the indoor heat exchange device 3, and the other end of the first pipeline is connected to one end of the outdoor heat exchange device 5.
Secondly, a connecting pipeline between the indoor heat exchange device 3 and the throttling component 4 is connected to one end of the outdoor heat exchange device 5 through a second pipeline and the first electromagnetic valve 6; wherein the first electromagnetic valve 6 is provided on the first pipe, one end of the second pipe is connected to a main pipe between the indoor heat exchange device 3 and the throttling part 4, and the other end of the second pipe is connected to one end of the outdoor heat exchange device 5.
One end of the first electromagnetic valve 6 is connected to the exhaust end of the compressor 1 through a pipeline, and the other end of the first electromagnetic valve 6 is connected to one end of the outdoor heat exchanging device 5.
The second electromagnetic valve 7 is a normally closed valve, and is configured to control a flow rate of the refrigerant/refrigerant flowing back to the compressor 1 to increase a system resistance, and the temperature of the refrigerant/refrigerant entering the outdoor heat exchange device 5 can be effectively increased by controlling the flow rate.
The third electromagnetic valve 8 is a normally open valve and is used for controlling the disconnection and the opening of a pipeline between the four-way reversing valve 2 and the outdoor heat exchange device 5.
The working principle of the embodiment is described as follows:
in the normal heating mode, as shown in fig. 5, the third electromagnetic valve 8 conducts the connecting pipeline between the four-way reversing valve 2 and the outdoor heat exchange device 5;
the refrigerant output by the exhaust end of the compressor 1 flows back to the compressor 1 along the four-way reversing valve 2, the indoor heat exchange device 3, the throttling component 4, the outdoor heat exchange device 5, the four-way reversing valve 2 and the air return end of the compressor 1 in sequence.
When the low-temperature area or the ultra-low-temperature area reaches the defrosting condition, as shown in fig. 3 and 7, the controller judges whether the defrosting condition is reached, when the defrosting condition is reached, the compressor starts to increase the frequency, the first electromagnetic valve 6, the second electromagnetic valve 7 and the third electromagnetic valve 8 operate, wherein the first electromagnetic valve 6 and the second electromagnetic valve 7 are controlled to be conducted, the third electromagnetic valve 8 is closed, the third electromagnetic valve 8 is in a non-conduction state, the outdoor heat exchange device 5 stops evaporating and absorbing heat, so that the refrigerant in the bypass loop heats the outdoor heat exchange device 5 to increase the temperature, and the frost is melted after being heated.
In this way, the connecting pipeline between the four-way reversing valve 2 and the outdoor heat exchange device 5 is cut off when the third electromagnetic valve 8 operates in the defrosting mode;
enabling a part of refrigerant output by the exhaust end of the compressor 1 to flow back to the compressor 1 along the four-way reversing valve 2, the indoor heat exchange device 3, the throttling component 4, the second electromagnetic valve 7, the four-way reversing valve and the air return end of the compressor 1 in sequence;
another part of the refrigerant output by the exhaust end of the compressor 1 sequentially flows back to the compressor 1 along the first electromagnetic valve 6, the outdoor heat exchange device 5, the second electromagnetic valve 7, the four-way reversing valve 2 and the air return end of the compressor 1.
And after the defrosting condition is quitted, the first electromagnetic valve 6 and the second electromagnetic valve 7 are controlled to be closed, and the third electromagnetic valve 8 is controlled to be conducted, so that the system operation is switched into a normal heating system mode, and the four-way reversing valve 2 is not reversed and is in a heating state.
The second electromagnetic valve 7 is operated and switched on to control the refrigerant/refrigerant of the outdoor heat exchange device 5 to flow back to the compressor 1 along the second electromagnetic valve 7, the four-way reversing valve 2 and the gas return end of the compressor 1, and the refrigerant/refrigerant returns to the compressor 1 through the second electromagnetic valve 2 after heat exchange of the outdoor heat exchange device 5, so that a closed loop (bypass loop) is formed, and a small part of high-temperature gas discharged by the compressor 1 can flow to the outdoor heat exchange device 5 to achieve rapid defrosting.
In addition, when the defrosting mode is operated, the high-temperature exhaust refrigerant of the compressor 1 still flows to the indoor heat exchange device 3 through the four-way reversing valve 2, so that the indoor heat exchange device 3 can still continue to heat during defrosting, hot air is continuously blown indoors, indoor heat supply requirements are met, and the use comfort of users is improved.
According to the embodiment, the defrosting time can be effectively shortened through the structural design and the corresponding control steps of the embodiment, and according to test data, the 2-minute defrosting technology can be realized through the scheme of the embodiment.
In addition, referring to fig. 4 to 6, as a further preferable scheme, a connection pipeline between the four-way reversing valve 2, the indoor heat exchange device 3 and the throttling component 4 is connected to one end of the outdoor heat exchange device 5 through at least one pipeline and a first electromagnetic valve 6, so as to form an input path of a bypass circuit, and the following three options are provided:
first, the first electromagnetic valve 6 is connected to one end of the outdoor heat exchange device 5 through the first pipeline alone;
secondly, the first electromagnetic valve 6 is connected to one end of the outdoor heat exchange device 5 through the second pipeline alone;
thirdly, the first pipeline, the second pipeline and the first electromagnetic valve 6 are used for constructing two input paths of the bypass circuit, and the first electromagnetic valve 6 collects the refrigerants of the two paths into the outdoor heat exchange device 5 to realize temperature rise and defrosting.
In summary, the air conditioning system provided in the embodiment of the present invention has the following beneficial effects:
(1) by setting a bypass loop for defrosting:
the refrigerant circulation main loop is provided with a bypass loop by connecting a connecting pipeline among the four-way reversing valve 2, the indoor heat exchange device 3 and the throttling component 4 or the exhaust end of the compressor 1 to one end of the outdoor heat exchange device 5 through at least one pipeline and a first electromagnetic valve 6, so that part of refrigerant with higher temperature is used for defrosting of the outdoor heat exchange device 5.
(2) The four-way reversing valve 2 does not need to be switched, the compressor 1 does not need to be started and stopped frequently, and the continuous heat supply of the indoor heat exchange device 3 is ensured:
when defrosting of the outdoor heat exchange device 5 is needed under a low temperature condition, the four-way reversing valve 2 does not need to be switched, the compressor 1 does not need to be started or stopped, the heating mode does not need to be switched to the refrigerating mode, at this time, the evaporation heat absorption function of the outdoor heat exchange device 5 is stopped, the connecting pipeline between the four-way reversing valve 2 and the outdoor heat exchange device 5 is cut off through the third electromagnetic valve 8, then a bypass loop inputs a refrigerant with a higher temperature in a refrigerant circulation main loop into the outdoor heat exchange device 5 from one end of the outdoor heat exchange device 5, and the refrigerant flowing out of the other end of the outdoor heat exchange device 5 flows back into the compressor 1 through the second electromagnetic valve 6 and the four-way reversing valve 2, so that the temperature of the outdoor heat exchange device 5 is increased, and the purpose of rapid defrosting is achieved.
(3) The pipeline design of the bypass loop is flexible:
according to the conditions of temperature, flow and the like of a refrigerant required by the outdoor heat exchange device 5 during defrosting, a connecting pipeline between the four-way reversing valve 2 and the indoor heat exchange device 3 can be connected to one end of the outdoor heat exchange device 5 through a pipeline and the first electromagnetic valve 6;
a connecting pipeline between the indoor heat exchange device 3 and the throttling component 4 can also be connected to one end of the outdoor heat exchange device through a pipeline and the first electromagnetic valve;
the exhaust end of the compressor 1 can be connected to one end of the outdoor heat exchange device 5 through a pipeline and the first electromagnetic valve 6;
of course, the three pipe designs described above may be combined.
(4) The control is simple, and the improvement cost is low:
the bypass loop is constructed through the three electromagnetic valves, continuous heating of the indoor unit is achieved under the conditions that the four-way reversing valve 2 is not required to be switched and the heating mode is changed, hot air can be blown out even during defrosting, the heating requirement is met, the use comfort of a user is improved, path switching of refrigerants is achieved only through the three electromagnetic valves, the heat of the refrigerants is effectively utilized for defrosting, the control is simple, and the improvement cost is low.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. An air conditioning system is characterized by comprising a refrigerant circulation main loop which is formed by connecting a compressor, a four-way reversing valve, an indoor heat exchange device, an outdoor heat exchange device and a throttling component through pipelines;
the four-way reversing valve, the indoor heat exchange device, a connecting pipeline between throttling components or an exhaust end of the compressor are connected to one end of the outdoor heat exchange device through a first electromagnetic valve and at least one pipeline, the other end of the outdoor heat exchange device is connected with one end of a second electromagnetic valve through a branch pipeline, a third electromagnetic valve is arranged on a main pipeline between the outdoor heat exchange device and the four-way reversing valve, and the other end of the second electromagnetic valve is connected to a main pipeline between the third electromagnetic valve and the four-way reversing valve through a branch pipeline.
2. The air conditioning system according to claim 1, wherein in the main refrigerant circulation circuit, an exhaust end of the compressor is connected to a first end of the four-way selector valve, a second end of the four-way selector valve is connected to one end of the indoor heat exchanger, the other end of the indoor heat exchanger is connected to one end of the throttling unit, the other end of the throttling unit is connected to the other end of the outdoor heat exchanger, one end of the outdoor heat exchanger is connected to one end of the third solenoid valve, and the other end of the third solenoid valve and the other end of the second solenoid valve are connected to a fourth end of the four-way selector valve, respectively.
3. The air conditioning system as claimed in claim 2, wherein a connection pipe between the four-way selector valve and the indoor heat exchanging means is connected to one end of the outdoor heat exchanging means through a first pipe, the first solenoid valve;
the first electromagnetic valve is arranged on the first pipeline, one end of the first pipeline is connected to a main pipeline between the second end of the four-way reversing valve and the indoor heat exchange device, and the other end of the first pipeline is connected to one end of the outdoor heat exchange device.
4. The air conditioning system according to claim 2, wherein a connection pipe between the indoor heat exchanging arrangement and the throttle member is connected to one end of the outdoor heat exchanging arrangement through a second pipe, the first solenoid valve;
wherein the first solenoid valve is disposed on the first pipe, one end of the second pipe is connected to a main pipe between the indoor heat exchanging apparatus and the throttling part, and the other end of the second pipe is connected to one end of the outdoor heat exchanging apparatus.
5. The air conditioning system as claimed in claim 2, wherein a discharge end of the compressor is connected to one end of the outdoor heat exchanging apparatus through a third pipe, the first solenoid valve;
wherein the first solenoid valve is disposed on the third pipeline, one end of the third pipeline is connected to a main path pipe between a discharge end of the compressor and a first end of the four-way reversing valve, and the other end of the third pipeline is connected to one end of the outdoor heat exchanging apparatus.
6. The air conditioning system according to claim 2, wherein a connection pipe between the four-way selector valve and the indoor heat exchanging means is connected to one end of the first solenoid valve through a first pipe, the other end of the first solenoid valve is connected to one end of the outdoor heat exchanging means, and a connection pipe between the indoor heat exchanging means and the throttle member is connected to one end of the first solenoid valve through a second pipe.
7. The air conditioning system according to claim 1 or 2, wherein a first shutoff valve is provided on a main pipe between the four-way selector valve and the indoor heat exchanging device, and a second shutoff valve is provided on a main pipe between the indoor heat exchanging device and the throttling part.
8. The air conditioning system of claim 1, further comprising a controller electrically connected to the compressor, the four-way reversing valve, the indoor heat exchanging device, the outdoor heat exchanging device, the throttling part, the first solenoid valve, the second solenoid valve, and the third solenoid valve, respectively.
9. The air conditioning system according to any one of claims 1 to 6, wherein the third solenoid valve shuts off a connection line between the four-way selector valve and the outdoor heat exchanging device when operating in a defrosting mode;
a part of refrigerant output by the exhaust end of the compressor flows back to the compressor along the four-way reversing valve, the indoor heat exchange device, the throttling component, the second electromagnetic valve, the four-way reversing valve and the air return end of the compressor in sequence;
and the other part of the refrigerant output by the exhaust end of the compressor sequentially flows back to the compressor along the first electromagnetic valve, the outdoor heat exchange device, the second electromagnetic valve, the four-way reversing valve and the air return end of the compressor.
10. The air conditioning system according to any one of claims 1 to 6, wherein the third solenoid valve conducts the connection line between the four-way selector valve and the outdoor heat exchanging device when operating in a normal heating mode;
the refrigerant output by the exhaust end of the compressor flows back to the compressor along the four-way reversing valve, the indoor heat exchange device, the throttling component, the outdoor heat exchange device, the four-way reversing valve and the air return end of the compressor in sequence.
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| CN111023454A (en) * | 2019-12-24 | 2020-04-17 | 海信（广东）空调有限公司 | Air conditioner and control method thereof |
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