CN108954886A - Cascade type heat pump system and its control method - Google Patents
Cascade type heat pump system and its control method Download PDFInfo
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- CN108954886A CN108954886A CN201810955608.8A CN201810955608A CN108954886A CN 108954886 A CN108954886 A CN 108954886A CN 201810955608 A CN201810955608 A CN 201810955608A CN 108954886 A CN108954886 A CN 108954886A
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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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
-
- 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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
-
- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The present invention provides a kind of Cascade type heat pump system and its control method, including evaporative condenser, the first heat-exchange system, the second heat-exchange system and heat exchanger, the medium of medium and second heat-exchange system in first heat-exchange system carries out heat exchange in the evaporative condenser, and the medium in the medium and second heat-exchange system in first heat-exchange system can exchange heat in the heat exchanger with the heat transferring medium in heat exchanger.Cascade type heat pump system provided by the invention and its control method, it can be on the basis of reaching existing Cascade type heat pump system using the first heat-exchange system and the second heat-exchange system, utilize the defrost process of warm water's (or hot wind) in the compressor progress of single-stage produced with outdoor evaporator, effectively reduce the energy consumption of system, the economy for increasing system effectively reduces the infrastructure cost and operating cost of Cascade type heat pump system.
Description
Technical field
The present invention relates to airhandling equipment technical field, especially a kind of Cascade type heat pump system and its control method.
Background technique
Ordinary single-stage air source heat pump system has many advantages, such as that structure is simple, system is reliable, but its evaporating temperature often by
The limitation of environment temperature, condensation temperature are then determined by the purposes of heat pump assembly.When outdoor environment temperature reduction or condensation temperature liter
Gao Shi causes refrigerating capacity decline, wasted work to increase, coefficient of performance in heating reduces, compressor gas transmission as the pressure ratio of compressor increases
The problems such as amount and efficiency decline, economy reduces, and ordinary single-stage compressing hot pump unit winter heating's performance degradation even nothing
Method works normally, and hinders heat pump unit in the popularization and application of north cold area, solve the problems, such as this method first is that using
The cascade type heat pump circulatory system.
Currently, conventional cascade type heat pump circulation is made of two individual heat pump cycles, system needs to configure two four
Port valve (as shown in Figure 1), in its high and low temperature grade respectively use, low-temperature refrigerant.The evaporation of high-temperature level refrigeration agent is used to make low
The refrigerant of warm grade condenses, and high-temperature level refrigeration agent condenses quantity of heat given up, is connected this two parts with an evaporative condenser,
It is both the evaporator of high-temperature part, and is the condenser of low temperature part.Once however outdoor environment temperature increases or user needs
When asking middle warm water (or hot wind) or carrying out defrost, high/low temperature grade compressor needs are worked at the same time, and energy consumption is high, uses cascade system
And it is uneconomical.
Summary of the invention
In order to solve the above-mentioned technical problem, a kind of Cascade type heat pump system and its controlling party reducing system energy consumption is provided
Method.
A kind of Cascade type heat pump system, including evaporative condenser, the first heat-exchange system, the second heat-exchange system and heat exchanger,
The medium of medium and second heat-exchange system in first heat-exchange system carries out heat exchange in the evaporative condenser,
And the medium in the medium and second heat-exchange system in first heat-exchange system can in the heat exchanger with change
Heat transferring medium in hot device exchanges heat.
The heat exchanger includes ontology and two sets of circulation lines, and heat transfer space, first heat exchange are formed in the ontology
The medium in medium and second heat-exchange system in system by two circulation lines and can be passed through described respectively
Heat transferring medium in heat transfer space exchanges heat.
Two sets of circulation lines include first circulation pipeline and second circulation pipeline, the first circulation pipeline and described second
Circulation line is all set in the body interior, and the both ends of the first circulation pipeline protrude the ontology formation first and enter
Mouth and first outlet, the both ends of the second circulation pipeline protrude the ontology and form second entrance and second outlet.
The inside of the ontology forms the heat transfer space, and be connected to the heat transfer space is provided on the ontology
Three entrances and third outlet, the heat transferring medium by the outlet of the third entrance, the heat transfer space and the third can be with
The first circulation pipeline or the second circulation pipeline exchange heat.
It is also formed with the first memory space in the ontology, is provided with first partition in first memory space, it is described
First memory space is divided into first and enters space and the first outflow space, the first entrance and described the by first partition
One, which enters space, is connected to, and the first outlet is connected to first outflow space, and the both ends of the first circulation pipeline point
Do not enter space with described first and first outflow space is connected to.
It is also formed with the second memory space in the ontology, is provided with second partition in second memory space, it is described
Second memory space is divided into second and enters space and the second outflow space, the second entrance and described the by second partition
Two, which enter space, is connected to, and the second outlet is connected to second outflow space, and the both ends of the second circulation pipeline point
Do not enter space with described second and second outflow space is connected to.
It is also formed with the first memory space and the second memory space in the ontology, is provided in first memory space
First memory space is divided into first and enters space and the first outflow space by first partition, the first partition, and described the
One entrance is connected to described first into space, and the first outlet is connected to first outflow space, and described first follows
The both ends on endless tube road enter space with described first respectively and first outflow space is connected to, and set in second memory space
It is equipped with second partition, second memory space is divided into second and enters space and the second outflow space, institute by the second partition
It states second entrance and is connected to described second into space, the second outlet is connected to second outflow space, and described the
The both ends of two circulation lines enter space with described second respectively and second outflow space is connected to.
First memory space is set to one end of the ontology, and first memory space and the heat transfer space
Opposing seal setting.
Second memory space is set to one end of the ontology, and second memory space and the heat transfer space
Opposing seal setting.
First memory space and second memory space are respectively arranged at the both ends of the heat transfer space.
Multiple baffles are provided in the heat transfer space, and all baffles are entered the heat transfer space by the third
Mouth exports to form continuous S-shaped runner to the third.
The first circulation pipeline and the second circulation pipeline are in U-shape structure.
Through-hole is offered on the ontology, all through-holes form the heat transfer space, and the first end of the through-hole
Third entrance is formed, the second end of the through-hole forms third outlet, by the third entrance, the through-hole and the third
The heat transferring medium of outlet can exchange heat with the first circulation pipeline or the second circulation pipeline.
The medium of medium and second heat-exchange system in first heat-exchange system in the evaporative condenser into
Row heat exchange, and the medium in the medium and second heat-exchange system in first heat-exchange system can be in the heat exchange
It exchanges heat in device with the heat transferring medium in heat transfer space.
First heat-exchange system includes the first compressor, the first four-way valve and the first evaporator, first compressor
Exhaust outlet be connected to the end D of first four-way valve, the C-terminal of first four-way valve respectively with the evaporative condenser and institute
Heat exchanger switching connection is stated, the end S of first four-way valve is connected to the air entry of first compressor, first four-way
The end E of valve is connected to the first end of first evaporator, and the second end of first evaporator and the evaporative condenser connect
It is logical.
Second heat-exchange system includes the second compressor, and the exhaust of second compressor is successively followed by described second
It is back to behind endless tube road and the evaporative condenser in second compressor.
The Cascade type heat pump system further includes pipeline reversing service, the entrance of the pipeline reversing service and described first
The C-terminal of four-way valve is connected to, and the first switching outlet of the pipeline reversing service is connected to the evaporative condenser, and the pipeline is cut
Second switching outlet of changing device and the first circulation pipeline connection.
The pipeline reversing service is triple valve, and the first end of the triple valve forms entering for the pipeline reversing service
Mouthful, remaining both ends is respectively formed the first switching outlet and the second switching outlet of the pipeline reversing service.
The pipeline reversing service include two two-port valves, the first end of two two-port valves with first four-way
The C-terminal of valve is connected to, and the second end of a two-port valve is connected to the evaporative condenser, and the second of another two-port valve
End and the first circulation pipeline connection.
The Cascade type heat pump system further includes first throttling device and second throttling device, the first throttling device
First end is connected to the second end of first evaporator, the second end of the first throttling device and the evaporative condenser and
The first circulation pipeline connection, the first end of the second throttling device and the second circulation pipeline connection, described second
The second end of throttling set is connected to the evaporative condenser.
A kind of control method of above-mentioned Cascade type heat pump system, comprising: single-stage heating mode, first compressor and
The first throttling device is opened, and second compressor and second throttling device are closed, the end D of first four-way valve and C
End connection, the entrance of the pipeline reversing service and the second switching outlet.
The control method further include: twin-stage heating mode, first compressor, second compressor, described
One throttling set, the second throttling device are opened, and the end D of first four-way valve is connected to C-terminal, the pipeline reversing service
Entrance and it is described first switching outlet.
The control method further include: defrost pattern, first compressor and the first throttling device are opened, described
Second compressor and the second throttling device are closed, and the end D of first four-way valve is connected to the end E, the pipeline switching dress
The entrance and the second switching outlet set.
Cascade type heat pump system provided by the invention and its control method can be changed using the first heat-exchange system and second
On the basis of hot systems reach existing Cascade type heat pump system, using the compressor of single-stage carry out in warm water produce and outdoor steaming
The defrost process for sending out device, effectively reduces the energy consumption of system, increases the economy of system, effectively reduces superposition type heat
The infrastructure cost and operating cost of pumping system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Cascade type heat pump system provided by the prior art；
Fig. 2 is the Cascade type heat pump system in the embodiment of Cascade type heat pump system provided by the invention and its control method
Structural schematic diagram；
Fig. 3 is that the structure of the heat exchanger in the embodiment of Cascade type heat pump system provided by the invention and its control method is shown
It is intended to；
Fig. 4 is another knot of the heat exchanger in the embodiment of Cascade type heat pump system provided by the invention and its control method
Structure schematic diagram；
Fig. 5 is the Cascade type heat pump system in the embodiment of Cascade type heat pump system provided by the invention and its control method
Another structural schematic diagram；
In figure:
1, evaporative condenser；2, the first heat-exchange system；3, the second heat-exchange system；4, heat exchanger；41, ontology；43, heat exchange is empty
Between；421, first circulation pipeline；422, second circulation pipeline；44, the first memory space；441, first partition；45, the second storage
Space；451, second partition；21, the first compressor；22, the first four-way valve；23, the first evaporator；31, the second compressor；24,
First throttling device；32, second throttling device；5, pipeline reversing service.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, right with reference to the accompanying drawings and embodiments
The present invention is further elaborated.It should be appreciated that described herein, the specific embodiments are only for explaining the present invention, not
For limiting the present invention.
Cascade type heat pump system as shown in Figures 2 to 5, including the heat exchange of evaporative condenser 1, the first heat-exchange system 2, second
The medium of system 3 and heat exchanger 4, medium and second heat-exchange system 3 in first heat-exchange system 2 is cold in the evaporation
Heat exchange, and the equal energy of medium in the medium and second heat-exchange system 3 in first heat-exchange system 2 are carried out in condenser 1
It is enough to exchange heat in the heat exchanger 4 with the heat transferring medium in heat exchanger 4, when Cascade type heat pump system is in outdoor environment temperature
Under conditions of the higher water temperature of lower and/or user demand (or higher leaving air temp), the first heat-exchange system 2 and the second heat-exchange system
3 are heated, thus achieve the purpose that meeting system and user requires, and when Cascade type heat pump system is in outdoor environment temperature
In higher and/or user demand when low water temperature (low leaving air temp in or), the second heat-exchange system 3 can be closed, using only
First heat-exchange system 2 exchanges heat in heat exchanger 4, to effectively reduce system energy consumption.
Above-mentioned mentioned outdoor environment temperature is higher, the more low environmental condition according to actual use of outdoor environment temperature
Set, at the same higher water temperature (or higher leaving air temp) and in low water temperature (low leaving air temp in or) can also be according to system
The requirement temperature of locating environment temperature and user is set, therefore, the application is higher not to outdoor environment temperature herein,
Outdoor environment temperature is lower, higher water temperature (or higher leaving air temp) and in low water temperature (low leaving air temp in or) specific value
Range is defined.
The heat exchanger 4 includes ontology 41 and two sets circulation lines, formation heat transfer space 43 in the ontology 41, and described the
The medium in medium and second heat-exchange system 3 in one heat-exchange system 2 can respectively by two circulation lines with
The heat transferring medium being passed through in the heat transfer space 43 exchanges heat, respectively will be in the first heat-exchange system 2 using two circulation lines
Medium and the second heat-exchange system 3 in medium introduce in heat transfer space 43, according to the switching of the working condition of heat pump system, choosing
The circulation line for selecting work reaches the control to different leaving water temperatures (or different leaving air temps).
Two sets of circulation lines include first circulation pipeline 421 and second circulation pipeline 422, the first circulation pipeline 421
It is all set in inside the ontology 41 with the second circulation pipeline 422, and the both ends of the first circulation pipeline 421 are prominent
The ontology 41 forms first entrance and first outlet, the both ends of the second circulation pipeline 422 protrude 41 shape of ontology
At second entrance and second outlet.
The inside of the ontology 41 forms the heat transfer space 43, is provided on the ontology 41 and the heat transfer space 43
The third entrance and third of connection export, the heat exchange exported by the third entrance, the heat transfer space 43 and the third
Medium can exchange heat with the first circulation pipeline 421 or the second circulation pipeline 422, wherein the third entrance and
The media such as water can be passed through between the third outlet to exchange heat.
It is also formed with the first memory space 44 in the ontology 41, is provided with first partition in first memory space 44
441, first memory space 44 is divided and enters space and the first outflow space for first by the first partition 441, and described the
One entrance is connected to described first into space, and the first outlet is connected to first outflow space, and described first follows
The both ends on endless tube road 421 enter space with described first respectively and first outflow space is connected to, so that by first circulation
The medium of pipeline 421 enters described first by the first entrance and enters in space, and enters space by first and follow into first
Enter first-class space out after carrying out cycle heat exchange in endless tube road 421, and is discharged by first outlet and completes circulation.
It is also formed with the second memory space 45 in the ontology 41, is provided with second partition in second memory space 45
451, second memory space 45 is divided and enters space and the second outflow space for second by the second partition 451, and described the
Two entrances are connected to described second into space, and the second outlet is connected to second outflow space, and described second follows
The both ends on endless tube road 422 enter space with described second respectively and second outflow space is connected to, so that by second circulation
The medium of pipeline 422 enters described second by the second entrance and enters in space, and enters space by second and follow into second
Enter second in endless tube road 422 after progress cycle heat exchange and go out space, and is discharged by second outlet and completes circulation.
The first memory space 44 and the second memory space 45, first memory space 44 are also formed in the ontology 41
It is inside provided with first partition 441, first memory space 44 is divided and enters space and first for first by the first partition 441
Outflow space, the first entrance are connected to described first into space, and the first outlet and first outflow space connect
It is logical, and the both ends of the first circulation pipeline 421 enter space with described first respectively and first outflow space is connected to, institute
It states and is provided with second partition 451 in the second memory space 45, it is that the second partition 451, which divides second memory space 45,
Two enter space and the second outflow space, and the second entrance is connected to described second into space, the second outlet and institute
The connection of the second outflow space is stated, and the both ends of the second circulation pipeline 422 enter space and described the with described second respectively
The connection of two outflow spaces.
First memory space 44 is set to one end of the ontology 41, and first memory space 44 is changed with described
The setting of 43 opposing seal of heat space guarantees by the medium in first circulation pipeline 421 and passes through the medium of heat transfer space 43 not
It is mixed.
Second memory space 45 is set to one end of the ontology 41, and second memory space 45 is changed with described
The setting of 43 opposing seal of heat space guarantees by the medium in second circulation pipeline 422 and passes through the medium of heat transfer space 43 not
It is mixed.
First memory space 44 and second memory space 45 are respectively arranged at the both ends of the heat transfer space 43,
Conveniently to the installation in 422 structure of first circulation pipeline 421 and second circulation pipeline.
Be provided with multiple baffles in the heat transfer space 43, and all baffles by the heat transfer space 43 by described
Three entrances to the third exports to form continuous S-shaped runner.
The first circulation pipeline 421 and the second circulation pipeline 422 are in U-shape structure.
Through-hole is offered on the ontology 41, all through-holes form the heat transfer space 43, and the of the through-hole
One end forms third entrance, and the second end of the through-hole forms third outlet, by the third entrance, the through-hole and described
The heat transferring medium of third outlet can exchange heat with the first circulation pipeline 421 or the second circulation pipeline 422, preferably
, the heat transferring medium is air, forms higher temperature after the air of the through-hole is exchanged heat in heat transfer space 43
Outlet air or medium and low temperature outlet air.
The medium of medium and second heat-exchange system 3 in first heat-exchange system 2 is in the evaporative condenser 1
Heat exchange is carried out, and the medium in the medium and second heat-exchange system 3 in first heat-exchange system 2 can be described
It exchanges heat in heat exchanger 4 with the heat transferring medium in heat transfer space 43.
First heat-exchange system 2 include the first compressor 21, the first four-way valve 22 and the first evaporator 23, described first
The exhaust outlet of compressor 21 is connected to the end D of first four-way valve 22, the C-terminal of first four-way valve 22 respectively with the steaming
The condenser 1 that feels cold is connected to the heat exchanger 4 switching, the air-breathing at the end S of first four-way valve 22 and first compressor 21
Mouth connection, the end E of first four-way valve 22 are connected to the first end of first evaporator 23, first evaporator 23
Second end is connected to the evaporative condenser 1, and first heat-exchange system 2 can adjust under the switching of the first four-way valve 22
The working condition of one evaporator 23, and then achieve the purpose that carry out heating or to 23 defrost of the first evaporator.
Second heat-exchange system 3 includes the second compressor 31, and the exhaust of second compressor 31 is successively passed through described
It is back to after second circulation pipeline 422 and the evaporative condenser 1 in second compressor 31, it is lower in outdoor environment temperature
And/or under conditions of the higher water temperature of user demand (or higher leaving air temp), the second heat-exchange system 3 is mainly heated, thus
Achieve the purpose that meet system and user requires, and when Cascade type heat pump system is higher and/or user needs in outdoor environment temperature
When seeking low water temperature (low leaving air temp in or), the second heat-exchange system 3 can be closed, be existed using only the first heat-exchange system 2
It exchanges heat in heat exchanger 4, to effectively reduce system energy consumption.
The Cascade type heat pump system further includes pipeline reversing service 5, the entrance of the pipeline reversing service 5 and described the
The C-terminal of one four-way valve 22 is connected to, and the first switching outlet of the pipeline reversing service 5 is connected to the evaporative condenser 1, described
Second switching outlet of pipeline reversing service 5 is connected to the first circulation pipeline 421, utilizes the pipeline reversing service 5, energy
The trend of the medium in the first heat-exchange system 2 is enough adjusted, and then achievees the purpose that the operating mode for adjusting Cascade type heat pump system.
The pipeline reversing service 5 is triple valve, and the first end of the triple valve forms the pipeline reversing service 5
Entrance, remaining both ends are respectively formed the first switching outlet and the second switching outlet of the pipeline reversing service 5.
The pipeline reversing service 5 includes two two-port valves, and the first end of two two-port valves is with the described 1st
The C-terminal of port valve 22 is connected to, and the second end of a two-port valve is connected to the evaporative condenser 1, another two-port valve
Second end be connected to the first circulation pipeline 421.
The Cascade type heat pump system further includes first throttling device 24 and second throttling device 32, the first throttle dress
It sets 24 first end to be connected to the second end of first evaporator 23, the second end and the steaming of the first throttling device 24
The condenser 1 that feels cold is connected to the first circulation pipeline 421, the first end of the second throttling device 32 and the second circulation pipe
Road 422 is connected to, and the second end of the second throttling device 32 is connected to the evaporative condenser 1.
A kind of control method of above-mentioned Cascade type heat pump system, comprising: single-stage heating mode, first compressor 21
It is opened with the first throttling device 24, second compressor 31 and second throttling device 32 are closed, first four-way valve
22 end D is connected to C-terminal, the entrance of the pipeline reversing service 5 and the second switching outlet, from the first compressor 21
The high-temperature high-pressure refrigerant steam of discharge successively passes through heat exchanger 4 and first throttling device 24, and in 24 section of first throttling device
Enter the first evaporator 23 after stream decompression, absorb the heat in outdoor environment in evaporator, becomes to enter after refrigerant vapour the
One compressor 21 is to complete single-stage heating cyclic process.
The control method further include: twin-stage heating mode, first compressor 21, second compressor 31, institute
First throttling device 24, the unlatching of the second throttling device 32 are stated, the end D of first four-way valve 22 is connected to C-terminal, the pipe
The entrance of circuit switching device 5 and the first switching outlet, the first compressor 21 and the second compressor 31 both participate in circulation,
The entrance of the pipeline reversing service 5 and the first switching outlet, the medium temperature and medium pressure system being discharged from the first compressor 21
Refrigerant vapor flows to evaporative condenser 1, after 1 heat release of evaporative condenser, into first throttle valve, after first throttle valve throttles
Become refrigerant vapour into the first evaporator 23, and after absorbing heat in the first evaporator 23 and completes the into the first compressor 21
The heating of one heat-exchange system 2 recycles；At the same time, the high-temperature high-pressure refrigerant steam of the second compressor 31 discharge enters heat exchanger
It exchanges heat in 4, and enters evaporative condenser 1 after second throttle reducing pressure by regulating flow, absorb first in evaporator-condenser and change
It is sucked after the heat gasification that heat transferring medium condensation in hot systems 2 is released by the second compressor 31, completes the second heat-exchange system 3
Heating circulation.
The control method further include: defrost pattern, first compressor 21 and the first throttling device 24 are opened,
Second compressor 31 and the second throttling device are closed, and the end D of first four-way valve 22 is connected to the end E, the pipe
The entrance of circuit switching device 5 and the second switching outlet, the high-temperature high-pressure refrigerant being discharged from the first compressor 21 steam
Gas enters the first evaporator 23 (now functioning as condenser), then enters heat exchanger 4 after first throttle valve is depressured and (now functions as
Evaporator), and become refrigerant vapour after absorbing heat in heat exchanger 4, the first compressor 21 is eventually entered into complete defrost circulation
Process.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (14)
1. a kind of Cascade type heat pump system, it is characterised in that: changed including evaporative condenser (1), the first heat-exchange system (2), second
The medium of hot systems (3) and heat exchanger (4), medium and second heat-exchange system (3) in first heat-exchange system (2) exists
Heat exchange, and medium and second heat-exchange system in first heat-exchange system (2) are carried out in the evaporative condenser (1)
(3) medium in can exchange heat in the heat exchanger (4) with the heat transferring medium in heat exchanger (4).
2. Cascade type heat pump system according to claim 1, it is characterised in that: the heat exchanger (4) includes ontology (41)
With two sets of circulation lines, the ontology (41) is interior to form heat transfer space (43), medium and institute in first heat-exchange system (2)
Two sets of circulation lines can be passed through respectively and be passed through in the heat transfer space (43) by stating the medium in the second heat-exchange system (3)
Heat transferring medium exchange heat.
3. Cascade type heat pump system according to claim 2, it is characterised in that: two sets of circulation lines include first circulation pipe
Road (421) and second circulation pipeline (422), the first circulation pipeline (421) and the second circulation pipeline (422) are respectively provided with
It is internal in the ontology (41), and the both ends of the first circulation pipeline (421) protrude the ontology (41) formation first and enter
Mouth and first outlet, the both ends of the second circulation pipeline (422) protrude the ontology (41) and form second entrance and second
Outlet.
4. Cascade type heat pump system according to claim 3, it is characterised in that: the inside of the ontology (41) forms described
Heat transfer space (43) is provided with the third entrance being connected to the heat transfer space (43) and third outlet on the ontology (41),
It can be with the first circulation pipe by the heat transferring medium that the third entrance, the heat transfer space (43) and the third export
Road (421) or the second circulation pipeline (422) exchange heat.
5. Cascade type heat pump system according to claim 3, it is characterised in that: Jie in first heat-exchange system (2)
The medium of matter and second heat-exchange system (3) carries out heat exchange, and first heat exchange system in the evaporative condenser (1)
The medium in medium and second heat-exchange system (3) in system (2) being capable of and heat transfer space interior in the heat exchanger (4)
(43) heat transferring medium in exchanges heat.
6. Cascade type heat pump system according to claim 5, it is characterised in that: first heat-exchange system (2) includes the
One compressor (21), the first four-way valve (22) and the first evaporator (23), the exhaust outlet of first compressor (21) with it is described
The end D of first four-way valve (22) is connected to, the C-terminal of first four-way valve (22) respectively with the evaporative condenser (1) and described
Heat exchanger (4) switching connection, the end S of first four-way valve (22) are connected to the air entry of first compressor (21), institute
The end E for stating the first four-way valve (22) is connected to the first end of first evaporator (23), and the of first evaporator (23)
Two ends are connected to the evaporative condenser (1).
7. Cascade type heat pump system according to claim 6, it is characterised in that: second heat-exchange system (3) includes the
The second circulation pipeline (422) and the evaporation are successively passed through in the exhaust of two compressors (31), second compressor (31)
It is back to after condenser (1) in second compressor (31).
8. Cascade type heat pump system according to claim 7, it is characterised in that: the Cascade type heat pump system further includes pipe
Circuit switching device (5), the entrance of the pipeline reversing service (5) are connected to the C-terminal of first four-way valve (22), the pipeline
First switching outlet of switching device (5) is connected to the evaporative condenser (1), and the second of the pipeline reversing service (5) cuts
The mouth that swaps out is connected to the first circulation pipeline (421).
9. Cascade type heat pump system according to claim 8, it is characterised in that: the pipeline reversing service (5) is threeway
Valve, and the first end of the triple valve forms the entrance of the pipeline reversing service (5), remaining both ends is respectively formed the pipeline
The the first switching outlet and the second switching outlet of switching device (5).
10. Cascade type heat pump system according to claim 8, it is characterised in that: the pipeline reversing service (5) includes two
A two-port valve, the first end of two two-port valves is connected to the C-terminal of first four-way valve (22), and a two-way
The second end of valve is connected to the evaporative condenser (1), the second end of another two-port valve and the first circulation pipeline
(421) it is connected to.
11. Cascade type heat pump system according to claim 8, it is characterised in that: the Cascade type heat pump system further includes
First throttling device (24) and second throttling device (32), the first end of the first throttling device (24) and first evaporation
The second end of device (23) is connected to, the second end of the first throttling device (24) and the evaporative condenser (1) and described first
Circulation line (421) connection, the first end of the second throttling device (32) are connected to the second circulation pipeline (422), institute
The second end for stating second throttling device (32) is connected to the evaporative condenser (1).
12. a kind of control method of Cascade type heat pump system described in any one of claims 1 to 11, it is characterised in that: packet
Include: single-stage heating mode, first compressor (21) and the first throttling device (24) are opened, second compressor
(31) it is closed with second throttling device (32), the end D of first four-way valve (22) is connected to C-terminal, the pipeline reversing service
(5) entrance and the second switching outlet.
13. control method according to claim 12, it is characterised in that: the control method further include: dual stage hot-die
Formula, first compressor (21), second compressor (31), the first throttling device (24), the second throttling dress
(32) unlatching is set, the end D of first four-way valve (22) is connected to C-terminal, the entrance of the pipeline reversing service (5) and described the
One switches out mouth connection.
14. control method according to claim 13, it is characterised in that: the control method further include: defrost pattern, institute
It states the first compressor (21) and the first throttling device (24) is opened, second compressor (31) and the second throttling dress
Closing is set, the end D of first four-way valve (22) is connected to the end E, and the entrance of the pipeline reversing service (5) is cut with described second
Change outlet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810955608.8A CN108954886A (en) | 2018-08-21 | 2018-08-21 | Cascade type heat pump system and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810955608.8A CN108954886A (en) | 2018-08-21 | 2018-08-21 | Cascade type heat pump system and its control method |
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| Publication Number | Publication Date |
|---|---|
| CN108954886A true CN108954886A (en) | 2018-12-07 |
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| CN201810955608.8A Pending CN108954886A (en) | 2018-08-21 | 2018-08-21 | Cascade type heat pump system and its control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595108A (en) * | 2019-10-23 | 2019-12-20 | 刘小江 | Dual-purpose switching type heat pump unit for preventing freezing pipe |
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| CN104075477A (en) * | 2014-06-18 | 2014-10-01 | 广东芬尼克兹节能设备有限公司 | Cascade high-temperature heat pump |
| CN105937822A (en) * | 2016-06-21 | 2016-09-14 | 广东芬尼克兹节能设备有限公司 | Cascade type high-temperature heat pump with high defrosting performance and control method of cascade type high-temperature heat pump |
| CN208887145U (en) * | 2018-08-21 | 2019-05-21 | 珠海格力电器股份有限公司 | Cascade type heat pump system |
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2018
- 2018-08-21 CN CN201810955608.8A patent/CN108954886A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104075477A (en) * | 2014-06-18 | 2014-10-01 | 广东芬尼克兹节能设备有限公司 | Cascade high-temperature heat pump |
| CN105937822A (en) * | 2016-06-21 | 2016-09-14 | 广东芬尼克兹节能设备有限公司 | Cascade type high-temperature heat pump with high defrosting performance and control method of cascade type high-temperature heat pump |
| CN208887145U (en) * | 2018-08-21 | 2019-05-21 | 珠海格力电器股份有限公司 | Cascade type heat pump system |
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| CN110595108A (en) * | 2019-10-23 | 2019-12-20 | 刘小江 | Dual-purpose switching type heat pump unit for preventing freezing pipe |
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