CN109945300B - Combined air conditioning system and defrosting control method for outdoor unit - Google Patents
Combined air conditioning system and defrosting control method for outdoor unit Download PDFInfo
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 22
- 238000010257 thawing Methods 0.000 title claims description 25
- 238000000034 method Methods 0.000 title claims description 11
- 239000003507 refrigerant Substances 0.000 claims abstract description 206
- 230000008878 coupling Effects 0.000 claims abstract description 73
- 238000010168 coupling process Methods 0.000 claims abstract description 73
- 238000005859 coupling reaction Methods 0.000 claims abstract description 73
- 238000005482 strain hardening Methods 0.000 claims abstract description 28
- 230000005855 radiation Effects 0.000 claims description 49
- 150000001875 compounds Chemical class 0.000 claims description 8
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 8
- 239000002131 composite material Substances 0.000 abstract description 3
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 239000003570 air Substances 0.000 description 84
- 238000010438 heat treatment Methods 0.000 description 9
- 238000005057 refrigeration Methods 0.000 description 8
- 238000007791 dehumidification Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 238000007664 blowing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
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- 238000010586 diagram Methods 0.000 description 4
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- 230000008859 change Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000035807 sensation Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 206010013786 Dry skin Diseases 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model discloses a composite air conditioning system, which utilizes the advantage of efficient heat exchange of a heat pipe device to provide an indoor temperature control system with the advantages of fast, uniform heat exchange, high efficiency and energy conservation; the cold working medium coupling parts of the loop heat pipes are serially coupled on the low-temperature refrigerant branch pipelines, the hot working medium coupling parts are serially coupled on the high-temperature refrigerant branch pipelines, the working requirements of the loop heat pipes are met, the length of a refrigerant loop is reduced as much as possible, the circulating resistance of the refrigerant is reduced, the power consumption of a system is reduced, and the overall working performance of the system is improved.
Description
Technical Field
The utility model relates to the technical field of air conditioners, in particular to a compound air conditioning system and an outdoor unit defrosting control method.
Background
Air conditioners have been popular in consumer homes as a home indoor temperature control system. The split air conditioner comprises an indoor unit and an outdoor unit, cold air or hot air is blown outwards through an air outlet to provide cold or heat for the indoor space in the existing air conditioner indoor unit, but because the cold air or hot air is directly blown out from the air outlet of the air conditioner, the air is blown onto a user, uncomfortable feeling of the user can be brought, and the use experience of the user is affected. Particularly, in the heating process, the air outlet temperature of the air conditioner must be increased due to cold feeling caused by blowing air onto a user, and in order to ensure that the air flow temperature reaches the user position to satisfy the user, the air outlet temperature sometimes needs to exceed 50 ℃ in consideration of continuous diffusion of the air outlet air and indoor air. The excessive condensing temperature can obviously reduce the circulation efficiency of the heat pump, and increase the heat leakage from indoor to outdoor, so that the ambient air of a user is drier, the efficiency is reduced, and the user is uncomfortable. When in refrigeration, the direct blowing sense causes cold and dry skin of a user to cause uncomfortable feeling of the user. Forced convection heat exchange inevitably causes obvious temperature gradient and uneven temperature distribution in an indoor temperature field.
The existing radiation heat exchange unit has the advantages of no noise, no wind sense, uniform temperature field, and meanwhile has the defects of incapability of independently dehumidifying indoor air, slow system starting and the like.
The Chinese patent with the authorized bulletin number of CN205957314U discloses an indoor unit of an air conditioner, which comprises a shell, an air outlet frame, an air deflector, an air outlet plate without wind sensation and a driving mechanism, wherein an air duct is arranged in the shell, and an air outlet is arranged on the shell; the air outlet frame is fixed in the shell and communicated with the air duct; the air guide plate is provided with an air guide opening which is matched with the air outlet in shape, the air outlet plate without wind sensation is provided with a plurality of small holes, and the air guide plate and the air outlet plate without wind sensation are both connected on the air outlet frame in a sliding way; the driving mechanism drives the air deflector and the air outlet without wind sense to be communicated with the air duct and the air outlet in a switchable manner. The air outlet of the utility model adopts the principle of reducing pressure and speed of small holes, so that the air flow rate is greatly reduced, and the air conditioner obviously reduces energy efficiency although the blowing sense is improved, and the problem of uneven temperature distribution and noise still cannot be solved in a low-wind-speed blowing mode.
The Chinese patent with publication number CN101936580A discloses a central air conditioning system of a capillary network terminal water source heat pump, which comprises a water source heat pump unit, a capillary network radiation circulation system, a replacement fresh air dehumidification circulation system and a temperature and humidity control system; the water source heat pump unit is communicated with a water inlet of the capillary network radiation circulation system through a circulating pump and a water collecting and distributing device; the external cold and heat source is the same as the inner cavity of the surface cooler through the circulating pump and the water inlet pipe orifice and returns to the external cold and heat source through the water outlet pipe orifice; the fresh air is communicated with the indoor air outlet through the surface cooler after heat exchange is realized between the fresh air and the indoor return air through the flat plate heat exchanger. Although the capillary radiation circulation system solves the blowing problem, because a separate fresh air dehumidification circulation system is needed during refrigeration, outdoor high-temperature and high-humidity air is dried through an independent dehumidification system, and then the dried air is blown into a room to be mixed with indoor air so as to prevent dew on the surface of the capillary radiation circulation system. Although the problem of dew condensation on the indoor radiation surface is solved, outdoor hot air is treated and enters the room, so that the waste of energy sources is caused while the indoor heat load is increased, and the cost of the whole system scheme is high.
The existing indoor temperature control system which connects the radiation heat exchange unit and the air conditioner unit in parallel uses the indoor unit of the air conditioner to dehumidify the indoor air, solves the defects that the radiation heat exchange unit works independently, but the radiation heat exchange unit and the indoor unit of the air conditioner are connected in parallel, so that the loop of the whole system is complex, the components are numerous, and the manufacturing cost is high.
If the radiation heat exchange unit is connected with the air conditioner in series, the system loop structure can be simplified under the condition of realizing the indoor dehumidification function and quick start, but because the refrigerant in the series state must pass through the air conditioner indoor unit and the radiation heat exchange unit in sequence, namely the air conditioner indoor unit and the radiation heat exchange unit must work simultaneously, if the series system is in a heating mode, when the outdoor heat exchanger needs defrosting, the low-temperature refrigerant can enter the indoor unit and the radiation heat exchange unit in sequence, and meanwhile, the indoor temperature is rapidly reduced due to the fact that the indoor heat is absorbed by the indoor unit and the radiation heat exchange unit, and the user experience is affected.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model provides a compound air conditioning system, which solves the technical problems that the existing radiation heat exchange system cannot dehumidify indoor air and the existing air conditioning indoor heat exchange efficiency is low. In order to achieve the above purpose, the present utility model adopts the following technical scheme: the utility model provides a combined type air conditioning system, includes off-premises station unit and indoor unit, and off-premises station unit both ends are respectively through intermediate pipeline intercommunication indoor unit, are coupled with the radiation heat transfer unit on the intermediate pipeline, and the radiation heat transfer unit includes the loop heat pipe, the loop heat pipe coupling in the intermediate pipeline.
Further, the loop heat pipe also comprises a middle pipeline and a heat transfer pipe, one end of the cold working medium coupling part is communicated with one end of the hot working medium coupling part through the middle pipeline, and the other end of the cold working medium coupling part is communicated with the other end of the hot working medium coupling part through the heat transfer pipe; the cold working medium coupling part and the hot working medium coupling part are coupled with the middle pipeline.
Further, the intermediate pipeline comprises a high-temperature refrigerant output main pipeline and a low-temperature refrigerant output main pipeline, and two ends of the outdoor unit are respectively communicated with the indoor unit through the high-temperature refrigerant output main pipeline and the low-temperature refrigerant output main pipeline.
Further, the cold working medium coupling part and the hot working medium coupling part are coupled on one or two pipelines of the high-temperature refrigerant output main pipeline and the low-temperature refrigerant output main pipeline.
Further, the intermediate pipeline further comprises a three-way valve, a high-temperature refrigerant branch pipeline and a low-temperature refrigerant branch pipeline, and the three-way valve, the high-temperature refrigerant branch pipeline and the low-temperature refrigerant branch pipeline are arranged on the high-temperature refrigerant output main pipeline or the low-temperature refrigerant output main pipeline;
the high-temperature refrigerant branch pipeline and the low-temperature refrigerant branch pipeline are mutually connected in parallel, one end of the high-temperature refrigerant branch pipeline and one end of the low-temperature refrigerant branch pipeline are respectively communicated with two common interfaces of the three-way valve, and the other end of the high-temperature refrigerant branch pipeline and the other end of the low-temperature refrigerant branch pipeline are communicated with the high-temperature refrigerant output main pipeline or the low-temperature refrigerant output main pipeline; the reversing port of the gating valve of the three-way valve is connected with the indoor unit; the cold working medium coupling part is coupled with the low-temperature refrigerant branch pipeline, and the hot working medium coupling part is coupled with the high-temperature refrigerant branch pipeline.
Further, the heat transfer pipe is connected with a heat dissipation device, and is embedded into the heat dissipation device; the heat radiator is a radiating fin or a radiator, or the heat transfer pipe is directly paved on a wall or the ground for use.
Further, the cold working medium coupling part is used for exchanging heat with the low-temperature refrigerant branch pipeline, and the hot working medium coupling part is used for exchanging heat with the high-temperature refrigerant branch pipeline.
Further, the indoor unit comprises an indoor heat exchanger, the reversing port of the three-way valve is communicated with the heat exchanger through a pipeline, the first common port of the three-way valve is connected with a low-temperature refrigerant branch pipeline, and the second common port of the three-way valve is connected with a high-temperature refrigerant branch pipeline.
Further, the outdoor unit comprises a compressor, a four-way valve, a throttling device and an outdoor heat exchanger, wherein the port B of the compressor is connected with the port E of the four-way valve, one end of the outdoor heat exchanger is connected with the port S of the four-way valve, the other end of the outdoor heat exchanger is connected with the throttling device, and the other end of the throttling device is connected with a main low-temperature refrigerant output pipeline; and the main high-temperature refrigerant output pipeline is connected to the C port of the four-way valve, and the A port of the compressor is connected to the D port of the four-way valve.
The indoor temperature rapid-reduction type air conditioner solves the technical problems that noise, slow heat exchange starting, incapability of achieving dehumidification, rapid indoor temperature reduction during defrosting of an outdoor unit and the like exist in a traditional air conditioner and a radiation heat exchange system. An air conditioner in which the intermediate pipes of such a combined air conditioning system include a main high-temperature refrigerant output pipe, a main low-temperature refrigerant output pipe, a three-way valve, a branch high-temperature refrigerant pipe, and a branch low-temperature refrigerant pipe is called a combined parallel-arm air conditioning system. The control method of the composite parallel branch air conditioning system comprises the following steps: after receiving the defrosting signal of the outdoor unit, the control unit controls the radiation heat exchange unit to enter a non-heat exchange mode, and after detecting the defrosting stop signal of the outdoor unit, the control unit controls the radiation heat exchange unit to enter a heat exchange mode.
The defrosting stop signal is a signal sent when the outdoor unit detects that the temperature of the coil pipe of the outdoor heat exchanger is higher than a set temperature value.
After receiving the defrosting signal, the control unit controls the four-way valve to conduct the exhaust port of the compressor with the outdoor heat exchanger, the compressor in the outdoor unit outputs high-temperature and high-pressure refrigerant to the outdoor heat exchanger to release heat for the outdoor heat exchanger, and then the high-temperature and high-pressure refrigerant flows back into the air inlet of the compressor through the indoor heat exchanger and the radiation heat exchange unit.
Compared with the prior art, the utility model has the following beneficial effects:
the air conditioner indoor unit and the radiation heat exchange unit are in a serial structure, so that the connection relation between a system loop and a pipeline is simplified, and the number of system components is reduced; meanwhile, the existing dehumidification function of the air conditioner indoor unit can be utilized to dehumidify the indoor air; further, loop heat pipes are adopted as radiation heat exchange units, so that the rapid, uniform, efficient and energy-saving heat exchange effect is achieved. The composite air conditioning system has the advantages of quick, uniform, efficient and energy-saving dehumidifying function and simplified structure.
The high-efficiency heat exchange advantage of the loop heat pipe is utilized, the loop heat pipe is coupled to the low-temperature refrigerant branch pipeline through the cold working medium coupling part, the hot working medium coupling part is coupled to the high-temperature refrigerant branch pipeline, the cold working medium coupling parts of the loop heat pipe are coupled to the low-temperature refrigerant branch pipeline in series, the hot working medium coupling parts are coupled to the high-temperature refrigerant branch pipeline in series, the working requirement of the loop heat pipe is met, the length of a refrigerant loop is reduced as much as possible, the circulating resistance of the refrigerant is reduced, the power consumption of the system is reduced, and the overall working performance of the system is improved.
In a specific implementation scheme that the high-temperature refrigerant branch pipeline and the low-temperature refrigerant branch pipeline are arranged in the high-temperature refrigerant output main pipeline, the three-way valve controls the first common port to be communicated with the reversing port during refrigeration circulation, the low-temperature refrigerant flows through the three-way valve after heat exchange of the indoor heat exchanger, flows to the low-temperature refrigerant branch pipeline and then returns to the outdoor unit pipeline, and the loop heat pipe releases heat; when in heating circulation, the three-way valve controls the second common port to be communicated with the reversing port, high-temperature refrigerant flows to a high-temperature refrigerant branch pipeline arranged in a room and then flows to the indoor heat exchanger through the three-way valve, and the heat pipe device absorbs heat. By means of the design, the low-temperature refrigerant branch pipeline and the high-temperature refrigerant branch pipeline are arranged in parallel, and heat exchange efficiency is guaranteed. The heat exchange area can be improved by mainly paving the heat pipes for the existing air conditioner, the radiation heat exchange enables the temperature field to be uniform, and the air conditioner is connected in parallel relative to the loop heat pipes, so that the pipeline structure is simple, the air conditioner is suitable for long-term use in families or other places of activities, and the temperature is kept constant.
The same principle can be used for obtaining the scheme working principle that the high-temperature refrigerant branch pipeline and the low-temperature refrigerant branch pipeline are arranged on the low-temperature refrigerant output main pipeline, and the description is omitted here. When the whole radiation heat exchange unit is arranged at the main pipeline of the low-temperature refrigerant output, the system provides refrigeration, and the low-temperature refrigerant firstly exchanges heat through the radiation heat exchange unit, and the radiation heat exchange unit has larger heat exchange area, so that better refrigeration effect can be achieved compared with the radiation heat exchange unit arranged at the main pipeline of the high-temperature refrigerant output.
The control method combines the advantages of windless heat exchange and uniform radiation of the radiation heat exchange unit and the advantages of rapid heat exchange of the air conditioner and indoor air dehumidification, and provides a method for solving the technical problem of rapid indoor temperature drop in a defrosting mode by utilizing the temperature sensing characteristic of the loop heat pipe radiation heat exchange device.
Because the radiation heat exchange unit is generally laid around the room or on the ground or the ceiling, the heat exchange area is large, and once the radiation heat exchange unit exchanges heat with the low-temperature refrigerant, the indoor temperature can be rapidly reduced. If heat exchange between the low temperature refrigerant and the heat radiating unit in the defrost mode can be avoided, the decrease in indoor temperature will be greatly reduced. The utility model utilizes the unidirectional temperature sensing switching feedback time of the loop heat pipe cold working medium coupling part and the hot working medium coupling part to delay the time of the indoor radiation heat exchange unit for absorbing a large amount of indoor heat when the outdoor unit is defrosted. And when the system of the loop heat pipe and the air conditioner connected in series enters a defrosting mode, a three-way valve on the refrigerant circulation loop is connected with a high-temperature refrigerant branch pipeline, so that the low-temperature refrigerant in the defrosting mode returns to the outdoor unit through the high-temperature refrigerant branch pipeline. That is, when the system enters defrost mode, the radiant heat exchange unit switches to non-heat exchange mode: the high-temperature refrigerant branch pipeline is coupled and connected with the hot working medium coupling part of the loop heat pipe; and the conduction port of the three-way valve is regulated to enable the low-temperature refrigerant to flow through the high-temperature refrigerant branch pipeline. When the low-temperature refrigerant passes through the high-temperature refrigerant branch pipeline, the thermal medium coupling part of the loop heat pipe cannot exchange heat with the low-temperature refrigerant in the high-temperature refrigerant branch pipeline, so that the phenomenon that the low-temperature refrigerant absorbs indoor air heat through the loop heat pipe to cause the indoor air temperature to drop sharply is avoided, uncomfortable feelings of users are caused, meanwhile, part of heat can still be provided for the indoor because the working medium in the radiation heat exchange unit still keeps higher temperature, and particularly, when the radiation heat exchange unit is paved on the floor, the foot of a human body is kept warm, and the human body feeling in a defrosting mode of the outdoor unit is further comfortable.
In the normal operating mode of the system (cooling or heating mode), the radiant heat exchange unit is switched to heat exchange mode: the low-temperature refrigerant flows through the low-temperature refrigerant branch pipeline and the high-temperature refrigerant flows through the high-temperature refrigerant branch pipeline by adjusting the conducting port of the three-way valve; by utilizing the high-efficiency heat exchange advantage of the loop heat pipe in the radiation heat exchange unit, the indoor temperature control system with high efficiency and energy conservation is provided; the cold working medium coupling parts of the loop heat pipes are serially coupled on the low-temperature refrigerant branch pipelines, the hot working medium coupling parts are serially coupled on the high-temperature refrigerant branch pipelines, the working requirements of the loop heat pipes are met, the length of a refrigerant loop is reduced as much as possible, the circulating resistance of the refrigerant is reduced, the power consumption of a system is reduced, and the overall working performance of the system is improved.
Non-heat exchange mode: the high-temperature refrigerant branch pipeline and the low-temperature refrigerant branch pipeline are arranged in a heat exchange mode concrete implementation scheme of the high-temperature refrigerant output main pipeline: during refrigeration cycle, the three-way valve controls the first common port to be communicated with the reversing port, low-temperature refrigerant flows through the three-way valve after heat exchange of the indoor heat exchanger, flows to the low-temperature refrigerant branch pipeline and then returns to the pipeline of the outdoor unit, and the loop heat pipe releases heat; when in heating circulation, the three-way valve controls the second common port to be communicated with the reversing port, high-temperature refrigerant flows to a high-temperature refrigerant branch pipeline arranged in a room and then flows to the indoor heat exchanger through the three-way valve, and the heat pipe device absorbs heat. By means of the design, the low-temperature refrigerant branch pipeline and the high-temperature refrigerant branch pipeline are arranged in parallel, and heat exchange efficiency is guaranteed. The heat exchange area can be improved by mainly paving the heat pipes for the existing air conditioner, the temperature field is uniform by radiation heat exchange, and the air conditioner is connected in parallel relative to the loop heat pipes, so that the pipeline structure is simple, the air conditioner is suitable for long-term use in families or other activity places, and the temperature is kept constant.
Drawings
FIG. 1 is a system block diagram of the present utility model;
FIG. 2 is a schematic diagram of a loop heat pipe structure;
FIG. 3 is a schematic diagram of a loop heat pipe series coupling;
fig. 4 is a schematic diagram of loop heat pipe parallel coupling.
Detailed Description
The scheme will now be further described with reference to the accompanying drawings.
Example 1
As shown in fig. 1 and 2: a compound air conditioning system comprises an outdoor unit 1 and an indoor unit 2, wherein two ends of the outdoor unit 1 are respectively communicated with the indoor unit 2 through intermediate pipelines to form a refrigerant circulation channel; the radiation heat exchange unit 19 is coupled to the intermediate pipe, and the radiation heat exchange unit 19 comprises a loop heat pipe 3, and the loop heat pipe 3 is coupled to the intermediate pipe.
The loop heat pipe 3 further comprises an intermediate pipeline 18 and a heat transfer pipe 5, one end of the cold working medium coupling part 8 is communicated with one end of the hot working medium coupling part 10 through the intermediate pipeline 18, and the other end of the cold working medium coupling part 8 is communicated with the other end of the hot working medium coupling part 10 through the heat transfer pipe 5; the cold working medium coupling part 8 and the hot working medium coupling part 10 are coupled to the intermediate pipeline. The coupling structure of the cold or hot working medium coupling part and the middle pipeline is as follows: the coupling part is a concentric cylinder structure with an inner wall, the middle pipeline passes through the coupling part, and the coupling part and the middle pipeline are welded and fixed together. The heat transfer tube 5 is connected with a heat dissipating device 4. The heat radiator is a radiating fin or a radiator, or the heat transfer pipe is directly paved on a wall or the ground for use. The working medium in the loop heat pipe and the refrigerant in the air conditioner circulate independently. The heat pipe device can be used for paving the large-area uniform heat exchange characteristic of loop heat pipes around a room and on the floor, and the indoor temperature control system capable of realizing rapid and uniform heat exchange and high efficiency and energy conservation is provided in a plurality of rooms.
Example 2
As shown in fig. 1 to 3, on the basis of embodiment 1, the intermediate pipe includes a main high-temperature-refrigerant-output pipe 16 and a main low-temperature-refrigerant-output pipe 17, and both ends of the outdoor unit 1 communicate with the indoor units 2 through the main high-temperature-refrigerant-output pipe 16 and the main low-temperature-refrigerant-output pipe 17, respectively. The high-temperature refrigerant output main pipeline 16 is coupled with the cold working medium coupling part 8 and the hot working medium coupling part 10. The indoor unit 2 includes an indoor heat exchanger 11, and a main high-temperature refrigerant output pipe 16 communicates with the heat exchanger 11. The cold medium coupling part 8 and the hot medium coupling part 10 are preferably coupled on the main high-temperature refrigerant output pipeline 16.
The outdoor unit 1 comprises a compressor 14, a four-way valve 6, a throttling device 13 and an outdoor heat exchanger 7, wherein a port of the compressor 14B is connected with a port E of the four-way valve 6, one end of the outdoor heat exchanger 7 is connected with a port S of the four-way valve 6, the other end of the outdoor heat exchanger 7 is connected with the throttling device 13, and the other end of the throttling device 13 is connected with a main low-temperature refrigerant output pipeline 17; the main high-temperature refrigerant output pipe 16 is connected to the port C of the four-way valve 6, and the compressor 14 a is connected to the port D of the four-way valve 6. The throttle device 13 is a common device of the existing air conditioning system. The loop heat pipe adopts the prior art, and realizes heat conduction by absorbing and releasing a large amount of heat in the phase change process. The loop heat pipe has the following working principle: the inside of the upper cold working medium coupling part 8 is coupled with a high-temperature refrigerant output main pipeline 16 or a low-temperature refrigerant output main pipeline 17; whether the high-temperature refrigerant output main pipeline 16 or the low-temperature refrigerant output main pipeline 17 is flowed with the refrigerant with any temperature, the loop heat pipe always works; the low temperature reduces the temperature of the working medium in the heat transfer tube 5 into liquid, and the liquid flows into the lower thermal working medium coupling part 10 through the middle pipeline 18, and the upper working medium is continuously liquefied and falls down due to the capillary structure in the heat transfer tube 5 to form upward-sucking power for the lower working medium, and meanwhile, the heat transfer tube 5 is continuously absorbing external heat to enable the lower liquid working medium to be vaporized and upward-flowing, so that the working medium is formed in a circulation mode in the loop heat tube;
the heating working principle is as follows: the lower thermal working medium coupling part 10, the high temperature makes the working medium vaporized and go up to the heat transfer tube 5, the heat transfer tube 5 liquefies after heat exchange with the outside, and flows down to the thermal working medium coupling part 10 from the middle pipeline 18 through the cold working medium coupler 8, so that circulation is performed, and a capillary structure exists in the middle pipeline 18, and the structure can provide power for the working medium flow when the pressure difference is formed.
When the loop heat pipe is switched from the heat exchange operation of the hot working medium coupling part to the operation of the cold working medium coupling part, a certain time is needed for converting the working medium in the loop heat pipe from a high temperature state to a low temperature state, so that when the system enters the defrosting mode of the outdoor unit, the indoor heat loss during defrosting of the outdoor unit can be reduced as much as possible by utilizing the state change time of the working medium in the loop heat pipe;
example 3
As shown in fig. 1 to 4, on the basis of embodiment 1, the intermediate pipe includes a main high-temperature-refrigerant-output pipe 16 and a main low-temperature-refrigerant-output pipe 17, and both ends of the outdoor unit 1 are respectively communicated with the indoor units 2 through the main high-temperature-refrigerant-output pipe 16 and the main low-temperature-refrigerant-output pipe 17. The low-temperature refrigerant output main pipe 17 is a return pipe of the high-temperature refrigerant.
The intermediate pipeline further comprises a three-way valve 12, a high-temperature refrigerant branch pipeline 15 and a low-temperature refrigerant branch pipeline 9, and the three-way valve 12, the high-temperature refrigerant branch pipeline 15 and the low-temperature refrigerant branch pipeline 9 are arranged on the high-temperature refrigerant output main pipeline 16 or the low-temperature refrigerant output main pipeline 17; the three-way valve 12 includes two common ports including a first inlet and a second inlet, and a gate port; the gating port can be communicated with any common port; in the working process of the three-way valve, a valve opens a medium to enter the valve from a gate port and flows out of the valve through a first inlet, when a bypass needs medium to flow in, an actuating mechanism rotates 90 degrees, a valve core reverses, a medium reversing port enters a second inlet and exits, when a pipeline does not need medium to flow in, the actuating mechanism rotates 90 degrees again, and the valve closes to intercept the medium.
The high-temperature refrigerant branch pipe 15 and the low-temperature refrigerant branch pipe 9 are mutually connected in parallel, one end of the high-temperature refrigerant branch pipe 15 and one end of the low-temperature refrigerant branch pipe 9 are respectively communicated with two common interfaces of the three-way valve 12, and the other end of the high-temperature refrigerant branch pipe 15 and the other end of the low-temperature refrigerant branch pipe 9 are communicated with the high-temperature refrigerant output main pipe 16 or the low-temperature refrigerant output main pipe 17; the reversing port of the gating valve 12 of the three-way valve 12 is connected with the indoor unit 2; the cold working medium coupling part 8 is coupled to the low-temperature refrigerant branch pipe 9, and the hot working medium coupling part 10 is coupled to the high-temperature refrigerant branch pipe 15.
The cold medium coupling part 8 is used for exchanging heat with the low-temperature refrigerant branch pipeline 9, and the hot medium coupling part 10 is used for exchanging heat with the high-temperature refrigerant branch pipeline 15.
The indoor unit 2 comprises an indoor heat exchanger 11, a reversing port of a three-way valve 12 is communicated with the heat exchanger 11 through a pipeline, a first common port of the three-way valve is connected with a low-temperature refrigerant branch pipeline 9, and a second common port of the three-way valve is connected with a high-temperature refrigerant branch pipeline 15.
The outdoor unit 1 comprises a compressor 14, a four-way valve 6, a throttling device 13 and an outdoor heat exchanger 7, wherein a port B of the compressor 14 is connected with a port E of the four-way valve 6, one end of the outdoor heat exchanger 7 is connected with a port S of the four-way valve 6, the other end of the outdoor heat exchanger 7 is connected with the throttling device 13, and the other end of the throttling device 13 is connected with a main low-temperature refrigerant output pipeline 17; the main high-temperature refrigerant output pipe 16 is connected to the port C of the four-way valve 6, and the compressor 14 a is connected to the port D of the four-way valve 6. The gate valve 12 may be installed and fixed in the indoor unit 2 for convenience of installation.
The outdoor heat exchanger 7 and the indoor unit 2 are also communicated through a low-temperature refrigerant output main pipe 17. The four-way valve is electrified, and the piston moves to enable the E port and the S port to be communicated, or the C port and the D port to be communicated.
The working medium in the loop heat pipe and the refrigerant in the air conditioner circulate independently. The three-way valve 12 is used for controlling the low-temperature refrigerant branch pipeline 9 and the high-temperature refrigerant branch pipeline 15 to be connected into the inner heat exchanger 11 through pipelines at different time, so as to ensure the realization of the refrigeration and heating functions.
The control low-temperature refrigerant branch pipe 9 and the high-temperature refrigerant branch pipe 15 are connected to the C port of the four-way valve 6, or may be connected to the C port of the four-way valve 6 after being joined by one pipe.
The loop heat pipe adopts the prior art, and realizes heat conduction by absorbing and releasing a large amount of heat in the phase change process. The loop heat pipe has the following working principle: the inside of the upper cold working medium coupling part 8 is coupled with the low-temperature refrigerant branch pipeline 9, the low temperature enables the working medium in the heat transfer pipe 5 to be cooled into liquid, the liquid flows into the lower hot working medium coupling part 10 through the middle pipeline 18, the upper working medium is continuously liquefied and falls down due to the capillary structure in the heat transfer pipe 5, the upward suction power is formed for the lower working medium, and meanwhile, the heat transfer pipe 5 is continuously absorbing external heat, so that the lower liquid working medium is vaporized and goes upward, and the working medium is formed in the loop heat pipe in a circulating way;
the heating working principle is as follows: the lower thermal working medium coupling part 10 is coupled with the high-temperature refrigerant branch pipeline 15, the high temperature enables the working medium to be vaporized and ascend to the heat transfer pipe 5, the heat transfer pipe 5 is liquefied after heat exchange with the outside, and then flows down to the thermal working medium coupling part 10 from the middle pipeline 18 through the cold working medium coupler 8, and is circulated in this way, a capillary structure exists in the middle pipeline 18, and the structure can provide power for the working medium to flow when the pressure difference is formed.
When the system enters the defrosting mode of the outdoor unit, the three-way valve is switched to enable low-temperature refrigerant to enter the high-temperature refrigerant branch pipeline, and the characteristics of unidirectional temperature sensing of the loop heat pipe are utilized, so that the loop heat pipe can be prevented from absorbing indoor heat, and the effect of maintaining indoor temperature is achieved.
Example 4
On the basis of embodiment 3, the intermediate pipe includes a main high-temperature-refrigerant output pipe 16 and a main low-temperature-refrigerant output pipe 17, and both ends of the outdoor unit 1 communicate with the indoor units 2 through the main high-temperature-refrigerant output pipe 16 and the main low-temperature-refrigerant output pipe 17, respectively. The high-temperature refrigerant output main pipe 16 serves as a return pipe for the low-temperature refrigerant.
The intermediate pipeline further comprises a three-way valve 12, a high-temperature refrigerant branch pipeline 15 and a low-temperature refrigerant branch pipeline 9, and the three-way valve 12, the high-temperature refrigerant branch pipeline 15 and the low-temperature refrigerant branch pipeline 9 are arranged on a low-temperature refrigerant output main pipeline 17;
the high-temperature refrigerant branch pipeline 15 and the low-temperature refrigerant branch pipeline 9 are mutually connected in parallel, one end of the high-temperature refrigerant branch pipeline 15 and one end of the low-temperature refrigerant branch pipeline 9 are respectively communicated with two common interfaces of the three-way valve 12, and the other end of the high-temperature refrigerant branch pipeline 15 and the other end of the low-temperature refrigerant branch pipeline 9 are communicated with the low-temperature refrigerant output main pipeline 17; the reversing port of the gating valve 12 of the three-way valve 12 is connected with the indoor unit 2; the cold working medium coupling part 8 is coupled to the low-temperature refrigerant branch pipe 9, and the hot working medium coupling part 10 is coupled to the high-temperature refrigerant branch pipe 15.
The cold medium coupling part 8 is used for exchanging heat with the low-temperature refrigerant branch pipeline 9, and the hot medium coupling part 10 is used for exchanging heat with the high-temperature refrigerant branch pipeline 15.
The indoor unit 2 comprises an indoor heat exchanger 11, a reversing port of a three-way valve 12 is communicated with the heat exchanger 11 through a pipeline, a first common port of the three-way valve is connected with a low-temperature refrigerant branch pipeline 9, and a second common port of the three-way valve is connected with a high-temperature refrigerant branch pipeline 15.
The outdoor unit 1 comprises a compressor 14, a four-way valve 6, a throttling device 13 and an outdoor heat exchanger 7, wherein a port B of the compressor 14 is connected with a port E of the four-way valve 6, one end of the outdoor heat exchanger 7 is connected with a port S of the four-way valve 6, the other end of the outdoor heat exchanger 7 is connected with the throttling device 13, and the other end of the throttling device 13 is connected with a main low-temperature refrigerant output pipeline 17; the main high-temperature refrigerant output pipe 16 is connected to the port C of the four-way valve 6, and the compressor 14 a is connected to the port D of the four-way valve 6. The gate valve 12 may be installed and fixed in the indoor unit 2 for convenience of installation.
The four-way valve is electrified, and the piston moves to enable the E port and the S port to be communicated, or the C port and the D port to be communicated.
The working medium in the loop heat pipe and the refrigerant in the air conditioner circulate independently. The three-way valve 12 is used for controlling the low-temperature refrigerant branch pipeline 9 and the high-temperature refrigerant branch pipeline 15 to be connected to the refrigerant main pipeline of the indoor heat exchanger 11 through pipelines at different time, so as to ensure the realization of refrigeration and heating functions.
The control low-temperature refrigerant branch pipe 9 and the high-temperature refrigerant branch pipe 15 are connected to the C port of the four-way valve 6, or may be connected to the C port of the four-way valve 6 after being joined by one pipe.
Example 5
On the basis of embodiment 3, the control method of the combined air conditioning system includes the steps of: the air conditioner remote controller sends out a defrosting signal, the control unit controls the radiation heat exchange unit to enter a non-heat exchange mode after receiving the defrosting signal, and the control unit controls the radiation heat exchange unit to enter a heat exchange mode after detecting a defrosting stop signal. The defrosting stop signal is a defrosting signal sent by the outdoor unit when the outdoor unit detects that the temperature of the coil pipe of the outdoor heat exchanger is higher than a set temperature value, such as-10 ℃.
After receiving the defrosting signal, the control unit controls the four-way valve to conduct the exhaust port of the compressor with the outdoor heat exchanger, the compressor in the outdoor unit outputs high-temperature and high-pressure refrigerant to the outdoor heat exchanger to release heat for the outdoor heat exchanger, and then the high-temperature and high-pressure refrigerant flows back into the air inlet of the compressor through the indoor heat exchanger and the radiation heat exchange unit. The radiation heat exchange unit switches the non-heat exchange mode by conducting the gate port of the three-way valve 12 with the high-temperature refrigerant branch pipe 15.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.
Claims (6)
1. A compound air conditioning system, which comprises an outdoor unit (1) and an indoor unit (2), wherein two ends of the outdoor unit (1) are respectively communicated with the indoor unit (2) through a middle pipeline,
the radiation heat exchange unit (19) is coupled to the middle pipeline, the radiation heat exchange unit (19) comprises a loop heat pipe (3), and the loop heat pipe (3) is coupled to the middle pipeline;
the loop heat pipe (3) further comprises a cold working medium coupling part (8), a hot working medium coupling part (10), an intermediate pipeline (18) and a heat transfer pipe (5), one end of the cold working medium coupling part (8) is communicated with one end of the hot working medium coupling part (10) through the intermediate pipeline (18), and the other end of the cold working medium coupling part (8) is communicated with the other end of the hot working medium coupling part (10) through the heat transfer pipe (5); the cold working medium coupling part (8) and the hot working medium coupling part (10) are coupled to the middle pipeline; the middle pipeline comprises a high-temperature refrigerant output main pipeline (16) and a low-temperature refrigerant output main pipeline (17), and two ends of the outdoor unit (1) are respectively communicated with the indoor unit (2) through the high-temperature refrigerant output main pipeline (16) and the low-temperature refrigerant output main pipeline (17);
the cold working medium coupling part (8) and the hot working medium coupling part (10) are coupled on one or two pipelines of the high-temperature refrigerant output main pipeline (16) and the low-temperature refrigerant output main pipeline (17);
the intermediate pipeline further comprises a three-way valve (12), a high-temperature refrigerant branch pipeline (15) and a low-temperature refrigerant branch pipeline (9), wherein the three-way valve (12), the high-temperature refrigerant branch pipeline (15) and the low-temperature refrigerant branch pipeline (9) are arranged on the high-temperature refrigerant output main pipeline (16) or the low-temperature refrigerant output main pipeline (17);
the high-temperature refrigerant branch pipeline (15) and the low-temperature refrigerant branch pipeline (9) are mutually connected in parallel, one end of the high-temperature refrigerant branch pipeline (15) and one end of the low-temperature refrigerant branch pipeline (9) are respectively communicated with two common interfaces of the three-way valve (12), and the other end of the high-temperature refrigerant branch pipeline (15) and the other end of the low-temperature refrigerant branch pipeline (9) are communicated with the high-temperature refrigerant output main pipeline (16) or the low-temperature refrigerant output main pipeline (17); the reversing port of the three-way valve (12) is connected with the indoor unit (2); the cold working medium coupling part (8) is coupled with the low-temperature refrigerant branch pipeline (9), and the hot working medium coupling part (10) is coupled with the high-temperature refrigerant branch pipeline (15).
2. A compound air conditioning system as set forth in claim 1 wherein,
the heat transfer tube (5) is connected with a heat dissipation device (4).
3. A compound air conditioning system as set forth in claim 1 wherein,
the indoor unit (2) comprises an indoor heat exchanger (11), a reversing port of the three-way valve (12) is communicated with the indoor heat exchanger (11) through a pipeline, a first common port of the three-way valve is connected with a low-temperature refrigerant branch pipeline (9), and a second common port of the three-way valve is connected with a high-temperature refrigerant branch pipeline (15).
4. A compound air conditioning system as set forth in claim 1 wherein,
the outdoor unit (1) comprises a compressor (14), a four-way valve (6), a throttling device (13) and an outdoor heat exchanger (7), wherein a port B of the compressor (14) is connected with a port E of the four-way valve (6), one end of the outdoor heat exchanger (7) is connected with a port S of the four-way valve (6), the other end of the outdoor heat exchanger (7) is connected with the throttling device (13), and the other end of the throttling device (13) is connected with a low-temperature refrigerant output main pipeline (17); the main high-temperature refrigerant output pipeline (16) is connected to the C port of the four-way valve (6), and the A port of the compressor (14) is connected to the D port of the four-way valve (6).
5. The combination air conditioning system of claim 1, wherein,
the control method of the compound air conditioning system comprises the following steps: after receiving the defrosting signal of the outdoor unit, the control unit controls the radiation heat exchange unit to enter a non-heat exchange mode, and after detecting the defrosting stop signal of the outdoor unit, the control unit controls the radiation heat exchange unit to enter a heat exchange mode;
the control of the radiant heat exchange unit into the non-heat exchange mode is specifically as follows: the high-temperature refrigerant branch pipeline is coupled and connected with the hot working medium coupling part of the loop heat pipe; regulating the conducting port of the three-way valve to enable the low-temperature refrigerant to flow through the high-temperature refrigerant branch pipeline;
the control of the radiation heat exchange unit to enter a heat exchange mode is specifically as follows: the low-temperature refrigerant flows through the low-temperature refrigerant branch pipeline and the high-temperature refrigerant flows through the high-temperature refrigerant branch pipeline by adjusting the conducting port of the three-way valve.
6. The combination air conditioning system of claim 5, wherein,
the defrosting stop signal is a signal sent when the outdoor unit detects that the temperature of the coil pipe of the outdoor heat exchanger is higher than a set temperature value.
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