CN109595846A - Heat pump unit and the method for controlling heat pump unit - Google Patents

Heat pump unit and the method for controlling heat pump unit Download PDF

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Publication number
CN109595846A
CN109595846A CN201811113760.8A CN201811113760A CN109595846A CN 109595846 A CN109595846 A CN 109595846A CN 201811113760 A CN201811113760 A CN 201811113760A CN 109595846 A CN109595846 A CN 109595846A
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CN
China
Prior art keywords
heat exchanger
pressure tank
valve
pump unit
throttling set
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201811113760.8A
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Chinese (zh)
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CN109595846B (en
Inventor
吕略
陈洪升
胡倩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
York Wuxi Air Conditioning and Refrigeration Co Ltd
Johnson Controls Technology Co
Original Assignee
York Wuxi Air Conditioning and Refrigeration Co Ltd
Johnson Controls Technology Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by York Wuxi Air Conditioning and Refrigeration Co Ltd, Johnson Controls Technology Co filed Critical York Wuxi Air Conditioning and Refrigeration Co Ltd
Priority to PCT/IB2018/057535 priority Critical patent/WO2019064248A1/en
Priority to KR1020207011319A priority patent/KR20200060732A/en
Priority to TW107134466A priority patent/TW201923293A/en
Priority to JP2020517850A priority patent/JP7096882B2/en
Priority to US16/651,800 priority patent/US20200240680A1/en
Priority to EP18786873.2A priority patent/EP3688385A1/en
Publication of CN109595846A publication Critical patent/CN109595846A/en
Application granted granted Critical
Publication of CN109595846B publication Critical patent/CN109595846B/en
Active legal-status Critical Current
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Classifications

    • 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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • 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
    • 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
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • 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
    • 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
    • F25B47/022—Defrosting cycles hot gas defrosting
    • F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/003—Indoor unit with water as a heat sink or heat source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/009—Compression machines, plants or systems with reversible cycle not otherwise provided for indoor unit in circulation with outdoor unit in first operation mode, indoor unit in circulation with an other heat exchanger in second operation mode or outdoor unit in circulation with an other heat exchanger in third operation mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0231—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02791—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using shut-off valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/029—Control issues
    • F25B2313/0291—Control issues related to the pressure of the indoor unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/029—Control issues
    • F25B2313/0292—Control issues related to reversing valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/16—Receivers
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/07—Exceeding a certain pressure value in a refrigeration component or cycle
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
    • 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
    • F25B2600/01—Timing
    • 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
    • F25B2600/2513—Expansion valves
    • 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
    • F25B2600/2519—On-off valves
    • 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
    • F25B2600/2523—Receiver valves

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)

Abstract

This application discloses a kind of heat pump unit and the methods for controlling heat pump unit.Heat pump unit includes compressor, throttling set, First Heat Exchanger, the second heat exchanger, third heat exchanger and intermediate pressure tank, and the heat pump unit can be run with plurality of operating modes.In plurality of operating modes, First Heat Exchanger or the second heat exchanger can be used as condenser.When needing to be switched to heat pump unit in rear operational mode from present mode of operation, judge whether to need to carry out pressure discharge operations as the First Heat Exchanger of condenser or the second heat exchanger in present mode of operation.When judgement needs to carry out pressure discharge operations, pressure discharge operations are carried out to First Heat Exchanger or the second heat exchanger.The heat pump unit of the application is not necessarily to that heat pump unit shutdown can be switched between the various modes of heat pump unit in time, reduces the time for needing to wait heat exchanger pressure release, improves switching efficiency.

Description

Heat pump unit and the method for controlling heat pump unit
Technical field
It is this application involves art of heat pumps, in particular to a kind of suitable for having while the heat of the application of demand to hot and cold Pump assembly (or heat pump system) and the method for controlling heat pump unit.
Background technique
It include compressor, throttling set and at least two heat exchangers, the compressor, throttling set and extremely in heat pump unit Few two heat exchangers constitute the circulatory system of refrigerant, and the heat exchange carried out by heat exchanger and working end (such as water) makes Working end also can carry out heat reclamation heat-production using condensation heat while refrigeration.Heat pump unit can there are many operational modes, and And it can switch between the various modes.
Summary of the invention
When switching the operational mode of heat pump unit, need to change refrigerant flow direction in the circulatory system.At this time must Compressor must first be stopped, after a period of time let out the heat exchanger (heat exchanger for being used as condenser) in circulatory system high-pressure side The heat exchanger is switched into low-pressure side again after pressure.The inventors of the present application found that existing heat pump unit generally can not in time into The switching of row mode.And pressure oscillation is larger in the circulatory system when switching, and it is very big to line shock, therefore noise and vibration water It is flat higher, so that the reliability of unit and comfort reduce.Especially when needing heat exchanging device to carry out defrost drain, shutdown is let out The pressure time is even more than defrost drain time, largely effects on heat pump unit working efficiency.
In addition, in the more heat pump unit of operating mode, it usually needs multiple four-way reversing valves are arranged or threeway is changed To valve to commutate to compressor and throttling set, not only pipeline jointing construction is complicated, system energy efficiency is lower, leakage of refrigerant Risk is big, and complicated control method is needed to switch over adjusting to multiple functions.
In order to solve problem above, at least one purpose of the application is to provide a kind of heat pump unit, can be realized a variety of Function, and free switching efficiently conveniently, steadily can be carried out between multiple functions.
According to a first aspect of the present application, this application provides a kind of heat pump units.Heat pump unit includes: compressor, institute Stating compressor includes suction end and exhaust end；Throttling set, the throttling set include arrival end and outlet end；First heat exchange Device, the second heat exchanger and third heat exchanger, the First Heat Exchanger include first port and second port, second heat exchanger Including first port and second port, the third heat exchanger includes first port and second port；And intermediate pressure tank, it is described in Tank is pressed to be equipped with intermediate pressure tank first entrance.The first port of First Heat Exchanger and the first port of second heat exchanger controllably with The suction end of the compressor is in fluid communication, and is controllably in fluid communication with the exhaust end of the compressor, and wherein, institute The suction end of the first port and the compressor of stating third heat exchanger is in fluid communication.The second port of the First Heat Exchanger and The second port of second heat exchanger controllably with the arrival end of the throttling set be in fluid communication, controllably with the throttling The outlet end of device is in fluid communication, and is controllably in fluid communication with medium pressure tank first entrance, and wherein, the third heat exchange The second port of device is controllably in fluid communication with the outlet end of the throttling set.
According to above-mentioned in a first aspect, heat pump unit further includes four-way valve, there is the four-way valve first interface, second to connect Mouth, third interface and the 4th interface.The first port of the First Heat Exchanger is connect with the second interface of the four-way valve, described The first port of second heat exchanger is connect with the 4th interface of the four-way valve, the suction end of the compressor and the four-way valve First interface connection, and the exhaust end of the compressor is connect with the third interface of the four-way valve.
According to above-mentioned in a first aspect, heat pump unit further include: throttling set entrance side control valve group, the throttling set enter Mouth side control valve group includes the first valve and the second valve, wherein the second port of the First Heat Exchanger and second heat exchanger Second port respectively by the first valve of the throttling set entrance side control valve group and the second valve controllably with the throttling The arrival end of device is in fluid communication；And throttling set outlet side control valve group, the throttling set outlet side control valve group packet Include the first valve, the second valve and third valve, wherein the second end of the second port of the First Heat Exchanger and second heat exchanger Mouth respectively by the first valve of the throttling set outlet side control valve group and the second valve controllably with the throttling set out Mouth end is in fluid communication, and the second port of the third heat exchanger passes through the third valve in the throttling set outlet side control valve group Controllably it is in fluid communication with the outlet end of the throttling set.
According to above-mentioned in a first aspect, medium pressure tank is additionally provided with intermediate pressure tank first outlet, medium pressure tank first outlet can Control ground and the outlet end of the throttling set are in fluid communication.The heat pump unit further include: intermediate pressure tank first entrance control valve group, Medium pressure tank first entrance control valve group include the first valve and the second valve, wherein the second port of the First Heat Exchanger and The second port of second heat exchanger passes through the first valve of medium pressure tank first entrance control valve group respectively and the second valve can Control ground is in fluid communication with medium pressure tank first entrance；And intermediate pressure tank first outlet control valve, medium pressure tank first outlet Controllably it is in fluid communication with the outlet end of the throttling set by medium pressure tank first outlet control valve.
According to above-mentioned in a first aspect, heat pump unit further include: intermediate pressure tank supercharger control valve and intermediate pressure tank unloading pressure control valve, institute Stating intermediate pressure tank includes intermediate pressure tank second entrance and intermediate pressure tank second outlet, wherein medium pressure tank second entrance passes through in described Pressure tank supercharger control valve is connected on the fluid path between the exhaust end of compressor and four-way valve, medium pressure tank second outlet The suction end of compressor is connected to by medium pressure tank unloading pressure control valve.
According to above-mentioned in a first aspect, medium pressure tank first entrance control valve group further include: the first check valve and the second list To valve, wherein first check valve is connected to the first valve and medium pressure tank of medium pressure tank first entrance control valve group Between first entrance, the second one-way valve is connected to the second valve and medium pressure of medium pressure tank first entrance control valve group Between tank first entrance.
According to above-mentioned in a first aspect, the first valve and the second valve of the throttling set entrance side control valve group are check valve.
According to above-mentioned in a first aspect, the First Heat Exchanger and the third heat exchanger are respectively with first for return pipe and Two connect for return pipe.
According to above-mentioned in a first aspect, heat pump unit further includes control device.The four-way valve, the throttling set outlet side Control valve group, medium pressure tank first entrance control valve group, medium pressure tank first outlet control valve, the pressurization control of medium pressure tank Valve processed and medium pressure tank unloading pressure control valve are connected to the control device and are controlled by the control device.
According to above-mentioned in a first aspect, the heat pump unit is configured as, by control refrigerant in the compressor, described Flow path in throttling set, the First Heat Exchanger, second heat exchanger and third heat exchanger, the heat pump unit energy It is enough to run and switch between the various modes in different modes, also, work as the First Heat Exchanger and described second When any one in heat exchanger needs to carry out in pattern switching pressure discharge operations, it can be received by medium pressure tank therein High-pressure refrigerant.
According to a second aspect of the present application, this application provides a kind of methods for controlling heat pump unit.The heat pump unit Including compressor, throttling set, First Heat Exchanger, the second heat exchanger, third heat exchanger and intermediate pressure tank.The heat pump unit can It is run with plurality of operating modes, wherein in the plurality of operating modes, the First Heat Exchanger or the second heat exchanger can be made For condenser use.The described method includes: when need by the heat pump unit from present mode of operation be switched to after operation mould When formula, judge whether to need to carry out pressure discharge operations to First Heat Exchanger or the second heat exchanger；When judgement is needed to First Heat Exchanger When carrying out pressure discharge operations, present mode of operation is kept, and executes following operation one: by the of First Heat Exchanger and medium pressure tank One entrance is in fluid communication, by the discharge refrigerant in the First Heat Exchanger into medium pressure tank；Or when judgement needs pair When second heat exchanger carries out pressure discharge operations, keep present mode of operation, and execute following operation two: by the second heat exchanger with it is described The first entrance of intermediate pressure tank is in fluid communication, by the discharge refrigerant in second heat exchanger into medium pressure tank.
According to above-mentioned second aspect, the method also includes: after the first predetermined time for executing the operation one, execute Three are operated below: the first entrance (112) of First Heat Exchanger (104) and medium pressure tank (110) is disconnected；Or described in the execution After second predetermined time of operation two, following operation four is executed: by the of the second heat exchanger (102) and medium pressure tank (110) One entrance (112) disconnects.
According to above-mentioned second aspect, the method also includes: after executing operation three or operation four, operation is described in rear fortune Row mode and the stopping present mode of operation.
According to above-mentioned second aspect, the method also includes: when it is described after operational mode bring into operation after, if described Refrigerant is required supplementation in the refrigerant circulation loop of rear operational mode, executes operation five: by the first outlet of medium pressure tank It is in fluid communication with the outlet end of the throttling set.
According to above-mentioned second aspect, the method also includes: when executing operation five, when the pressure in medium pressure tank is low When the first preset pressure value, the second entrance of medium pressure tank and the exhaust end of the compressor is in fluid communication, to increase State the pressure in intermediate pressure tank.
According to above-mentioned second aspect, the method also includes: when executing operation one or operation two, when the pressure in intermediate pressure tank When power is higher than the second preset pressure value, the second outlet of medium pressure tank and the suction end of the compressor is in fluid communication, with drop Pressure in low medium pressure tank.
It is described to judge whether to need to carry out pressure discharge operations to First Heat Exchanger or the second heat exchanger according to above-mentioned second aspect The step of include: when the First Heat Exchanger or second heat exchanger in the present mode of operation as condenser, and It is described be not re-used as condenser in rear operational mode when, judge need to the First Heat Exchanger or second heat exchanger Carry out pressure discharge operations.
According to above-mentioned second aspect, the plurality of operating modes includes separate refrigeration mode, independent heating mode while making Cold and heating mode and defrost pattern；And the First Heat Exchanger and the third heat exchanger are respectively with first for return water Pipe is connected with second for return pipe.
According to above-mentioned second aspect, when the heat pump unit is with the separate refrigeration mode operation, the compressor, institute Throttling set, second heat exchanger and the third heat exchanger are stated in refrigerant circulation loop, wherein in the independent system In cold mode, second heat exchanger is as condenser；It is described when the heat pump unit is run with the independent heating mode Compressor, the throttling set, the First Heat Exchanger and second heat exchanger are in refrigerant circulation loop, wherein In the independent heating mode, the First Heat Exchanger is as condenser；When the heat pump unit is with described while refrigeration and system When heat pattern is run, the compressor, the throttling set, the First Heat Exchanger and the third heat exchanger are followed in refrigerant In loop back path, wherein in described while refrigeration and heating mode, the First Heat Exchanger is as condenser；And when described When heat pump unit is run with the defrost pattern, the compressor, the throttling set, the First Heat Exchanger and described second Heat exchanger is in refrigerant circulation loop, and second heat exchanger is as condenser.
It is described to judge whether to need to carry out pressure discharge operations to First Heat Exchanger or the second heat exchanger according to above-mentioned second aspect The step of include: when the present mode of operation be the separate refrigeration mode, it is described after operational mode be the independent system When heat pattern or described while refrigeration and heating mode, judge to need to carry out pressure discharge operations to second heat exchanger；Work as institute State present mode of operation be the independent heating mode, it is described in rear operational mode be the separate refrigeration mode or the defrost When mode, judge to need to carry out pressure discharge operations to the First Heat Exchanger；Freeze simultaneously described in being when the present mode of operation With heating mode, it is described rear operational mode be the separate refrigeration mode when, judge need to the First Heat Exchanger carry out Pressure discharge operations；Or when the present mode of operation be the defrost pattern, it is described after operational mode be the independent heating When mode, judge to need to carry out pressure discharge operations to second heat exchanger.
The heat pump unit of the application receives the high-pressure refrigerant in heat exchanger by intermediate pressure tank, without to heat pump unit Shutdown can be switched between the various modes of heat pump unit in time, reduce need to wait heat exchanger pressure release when Between, improve switching efficiency.Therefore, the heat pump unit of the application can not only realize separate refrigeration, individually heating while freeze With the various modes of heating and defrost, additionally it is possible to the working condition of flexible adjusting heat pump unit is needed according to operating condition, thus The refrigeration of adjusting heat pump unit, heating capacity meet operating condition needs.Meanwhile the heat pump unit piping connection of the application is simple, it can be with It is compact-sized it is not necessary that gas-liquid separator and liquid storage device is separately arranged, the risk of leakage of refrigerant is reduced, it is reliable to improve unit Property.
Detailed description of the invention
Fig. 1 is the block diagram of one embodiment of the heat pump unit of the application；
Fig. 2A -2C is the block diagram of the control device of heat pump unit shown in FIG. 1；
Fig. 3 A-3D shows refrigerant circulation loop under four kinds of operating modes of heat pump unit shown in FIG. 1；
Fig. 4 shows the flow chart that the heat pump unit in control figure 1 carries out the method for operational mode switching；
Fig. 5 A show heat pump unit shown in FIG. 1 from separate refrigeration pattern switching be simultaneously refrigeration and heating mode When, the flow path of refrigerant；
Fig. 5 B show the heat pump unit in Fig. 1 freeze at the same time and heating mode under when running, refrigerant circulation is returned Road carries out the flow path of the refrigerant of fluid infusion operation；
Fig. 6 is the connection block diagram of another embodiment of the heat pump unit of the application.
Specific embodiment
The various specific embodiments of the application are described below with reference to the attached drawing for constituting this specification a part. Although should be understood that in this application using indicate direction term, such as "front", "rear", "upper", "lower", " left side ", " right side " etc. describes the various example features and element of the application, but herein using these terms are merely for convenience of description Purpose, the determination based on the example orientations shown in attached drawing.Since embodiment disclosed in the present application can be according to difference Direction setting, so these indicate directions term be intended only as illustrate and should not be considered as limiting.
Fig. 1 is the block diagram of one embodiment of the heat pump unit of the application.Heat pump unit as shown in Figure 1 includes compressor 101, throttling set 107, First Heat Exchanger 104, the second heat exchanger 102, third heat exchanger 103, intermediate pressure tank 110, four-way valve 120, and other the several valves that will be introduced below.It is shown in FIG. 1 in all parts (including compressor 101, throttling set 107, First Heat Exchanger 104, the second heat exchanger 102, third heat exchanger 103, four-way valve 120, intermediate pressure tank 110 and other are each Valve) between line indicate connecting line.Wherein, compressor 101 has suction end 106 and exhaust end 105,106 He of suction end Exhaust end 105 is respectively connected with four-way valve 120.Compressor 101 allows fluid from its suction end 106 to 105 one-way flow of exhaust end It is logical.Throttling set 107 includes arrival end 108 and outlet end 109, and throttling set 107 allows fluid from its arrival end 108 to outlet Hold 109 one-way flows.In other examples, four-way valve can also be substituted using other valves or valve group.As shown in Figure 1 The tool of four-way valve 120 there are four interface, including first interface 120.1, second interface 120.2, third interface 120.3 and the 4th connect Mouth 120.4.Wherein first interface 120.1 is connected with the suction end 106 of compressor 101, third interface 120.3 and compressor 101 Exhaust end 105 be connected, second interface 120.2 is connected with First Heat Exchanger 104, the 4th interface 120.4 and the second heat exchanger 102 It is connected.
To be connected to when the third interface 120.3 of four-way valve 120 with second interface 120.2, and first interface 120.1 and the When four interfaces 120.4 are connected to, the exhaust end 105 of compressor and First Heat Exchanger 104 is in fluid communication, and the air-breathing of compressor End 106 and the second heat exchanger 102 are in fluid communication.Therefore, First Heat Exchanger 104 can be located at the high pressure of unit as condenser Side, and the second heat exchanger 102 can be located at unit low-pressure side.
And the third interface 120.3 for working as four-way valve 120 is connected to the 4th interface 120.4, and first interface 120.1 and second When interface 120.2 is connected, the exhaust end 105 of compressor and the second heat exchanger 102 is in fluid communication, and the air-breathing of compressor End 106 is in fluid communication with First Heat Exchanger 104.Therefore, the second heat exchanger 102 can be located at the high pressure of unit as condenser Side, First Heat Exchanger 104 can be located at unit low-pressure side.
In the embodiment shown in fig. 1, the suction end 106 of third heat exchanger 103 and compressor is in fluid communication, therefore the Three heat exchangers 103 are used always situated in the low-pressure side of unit not as condenser.
Still as shown in Figure 1, wherein First Heat Exchanger 104, the second heat exchanger 102 and third heat exchanger 103 respectively have At least two ports, wherein the first port 116.1 of First Heat Exchanger 104 and the first port 121.1 of the second heat exchanger 102 with Four-way valve 120 is connected, and the first port 123.1 of third heat exchanger 103 is connected with compressor air suction end 106.Heat pump unit is also wrapped Include 118.1,118.2 He of throttling set entrance side control valve group 115.1,115.2 and throttling set outlet side control valve group 118.3。
First Heat Exchanger 104 also has second port 116.2, and second port 116.2 is controlled by throttling set entrance side The arrival end 108 of the first valve 115.1 and throttling set 107 of valve group is in fluid communication, and second port 116.2 passes through throttling dress The outlet end 109 for setting the first valve 118.1 and throttling set 107 of outlet side control valve group is in fluid communication, to make second port 116.2 entrances that both can be used as First Heat Exchanger 104 receive the refrigerant that flows out from throttling set outlet end 109, can also be with Outlet as First Heat Exchanger 104 conveys refrigerant to throttling set arrival end 108.Therefore, First Heat Exchanger 104 allows to flow Body is controllably double from its first port 116.1 to second port 116.2 or from its second port 116.2 to first port 116.1 To flowing.
Second heat exchanger 102 is similar with First Heat Exchanger 104, equally has second port 121.2, second port 121.2 It is in fluid communication by the arrival end 108 of the second valve 115.2 and throttling set 107 of throttling set entrance side control valve group, and It is in fluid communication by the outlet end 109 of the second valve 118.2 and throttling set 107 of throttling set outlet side control valve group.Therefore, Second heat exchanger 102 allows fluid from its first port 121.1 to second port 121.2 or from its second port 121.2 to the The controllably two-way flow of Single port 121.1.
Third heat exchanger 103 also has second port 123.2, but the second port 123.2 of third heat exchanger 103 only passes through The outlet end 109 of third valve 118.3 and throttling set 107 in throttling set outlet side control valve group is in fluid communication.
In the application embodiment as shown in Figure 1, the throttling set 107 is expansion valve, and high-pressure refrigerant is from entering Mouth end 108 enters in expansion valve 107, becomes low pressure refrigerant and is discharged again from outlet end 109.As a result, in order to make First Heat Exchanger 104 and the second refrigerant in heat exchanger 102 controlled can flow to the arrival end 108 of throttling set 107, throttling set enters The first valve 115.1 and the second valve 115.2 of mouth side control valve group can be solenoid valve or check valve.As an example, it is More cost-effective, the first valve 115.1 and the second valve in embodiment as shown in Figure 1 in throttling set entrance side control valve group 115.2 be check valve.When check valve 115.1 is opened, the refrigerant in First Heat Exchanger 104 can flow to throttling set 107 Arrival end 108, when check valve 115.2 is opened, the refrigerant in the second heat exchanger 102 can flow to the entrance of throttling set 107 End 108.Check valve is automatically opened and closed by the pressure difference of check valve two sides, without passing through control device shown in Fig. 2A 230 control its opening and closing.But according to the application, the first valve 115.1 of throttling set entrance side control valve group and Two valves 115.2 or solenoid valve, and be connected to control device 230 shown in Fig. 2A and by the control device 230 Control.First valve 118.1 of throttling set outlet side control valve group, the second valve 118.2 and third valve 118.3 can be electromagnetism Valve, so that can controllably flow into required heat exchanger from the refrigerant that the outlet end of throttling set 107 109 is flowed out In.Such as open the first valve 118.1 and close the second valve 118.2 and third valve 118.3, then from the outlet end of throttling set 107 The refrigerant of 109 outflows can flow into First Heat Exchanger 104.
Above-mentioned First Heat Exchanger 104, the second heat exchanger 102 and third heat exchanger 103 can choose various types of heat exchange Device, such as carry out the air heat exchanger of heat exchange with air or carry out the water-side heat of heat exchange with water.As an example, Second heat exchanger 102 is the air heat exchanger not connecting with working end, and First Heat Exchanger 104 and third heat exchanger 103 are water Side heat exchanger is connect for return pipe 111.1 and second for return pipe 111.2 with first respectively, so that heat exchanger carries out heat exchange When be capable of providing user side needed for heat or cooling capacity.As another example, the heat pump unit of the application also can wrap Include more than three heat exchanger.
Still as shown in Figure 1, further including intermediate pressure tank 110 in heat pump unit, intermediate pressure tank 110 is the appearance for storing refrigerant Device, the refrigerant can be refrigerant liquid or the gas-liquid mixture of refrigerant gas or refrigerant.Intermediate pressure tank 110 has Intermediate pressure tank first entrance 112 and intermediate pressure tank first outlet 128, wherein intermediate pressure tank first entrance 112 passes through intermediate pressure tank first entrance Control valve group 113.1 and 113.2 and the heat exchanger (i.e. First Heat Exchanger 104 and the second heat exchanger 102) that can be used as condenser It is in fluid communication.In the example depicted in fig. 1, intermediate pressure tank first entrance 112 passes through the in intermediate pressure tank first entrance control valve group One valve 113.1 and the second valve 113.2 second end with the second end 116.2 of First Heat Exchanger 104 and the second heat exchanger 102 respectively 121.2 being in fluid communication.As a kind of example of connection type, the intermediate pressure tank first entrance 112 is entered by intermediate pressure tank first The first valve 115.1 that the first valve 113.1 in mouth control valve group is connected in throttling set entrance side control valve group is filled with throttling It sets on the fluid path between 107 arrival end 108, and passes through the second valve in intermediate pressure tank first entrance control valve group 113.2 are connected between the second valve 115.2 in throttling set entrance side control valve group and the arrival end 108 of throttling set 107 Fluid path on.So as to be entered by control throttling set entrance side control valve group 115.1,115.2 and intermediate pressure tank first Mouth control valve group 113.1,113.2 makes the high-pressure refrigerant in First Heat Exchanger 104 and the second heat exchanger 102 flow into intermediate pressure tank In 110.As another example, shown intermediate pressure tank first entrance 112 or multiple, each entrance passes through respective entrance Control valve is connected to the multiple heat exchanger fluids that can be used as condenser respectively.As another example, intermediate pressure tank first entrance Control valve group can also only include a valve, and intermediate pressure tank first entrance 112 directly passes through the arrival end of the valve and throttling set 107 108 connections.
In intermediate pressure tank 110 as shown in Figure 1, intermediate pressure tank first outlet 128 by intermediate pressure tank first outlet control valve 114 with Low pressure fluid communication when heat pump unit is run, allows the refrigerant in intermediate pressure tank 110 to back flow back into the circulation of refrigerant In circuit, refrigerant can be supplemented into refrigerant circulation loop.Intermediate pressure tank first outlet 128 passes through the control of intermediate pressure tank first outlet Second end 116.2, the second end 121.2 and third heat exchanger 103 of the second heat exchanger 102 of valve 114 and First Heat Exchanger 104 processed Second end 123.2 be in fluid communication.In order to improve the stability of unit operation, medium pressure tank first outlet control valve 114 can Think expansion valve, it can be ensured that the refrigerant flowed out from intermediate pressure tank first outlet 128 can become after flowing through the expansion valve The low-pressure side of unit is flowed into for low pressure refrigerant.As an example, intermediate pressure tank first outlet 128 can pass through intermediate pressure tank first The outlet end 109 of discharge control valve 114 and throttling set is in fluid communication.Due to intermediate pressure tank first entrance 112 and intermediate pressure tank first The bottom of intermediate pressure tank 110 is arranged in mainly for delivery of refrigerant liquid in outlet 128.
Heat pump unit further includes intermediate pressure tank supercharger control valve 135 and intermediate pressure tank unloading pressure control valve 136.Intermediate pressure tank 110 also has There are intermediate pressure tank second entrance 181 and intermediate pressure tank second outlet 182.As an example, intermediate pressure tank supercharger control valve 135 is by middle pressure Tank second entrance 181 is connected on the fluid path between the exhaust end 105 of compressor 101 and four-way valve 120, intermediate pressure tank pressure release Intermediate pressure tank second outlet 182 is connected to the suction end 106 of compressor 101 by control valve 136.Due to intermediate pressure tank second entrance 181 With intermediate pressure tank second outlet 182 mainly for delivery of refrigerant gas, therefore the top of intermediate pressure tank 110 is set.
Medium pressure tank 110 receives the height from the heat exchanger discharge as condenser by intermediate pressure tank first entrance 112 Compression refrigerant reduces the refrigerant in the heat exchanger, pressure reduction, and the refrigerant in intermediate pressure tank 110 increases, pressure liter It is high.Intermediate pressure tank 110 can also supplement refrigerant to refrigerant circulation loop by intermediate pressure tank first outlet 128.When intermediate pressure tank 110 In hypertonia when, the refrigerant gas in intermediate pressure tank 110 can be transported to by opening intermediate pressure tank unloading pressure control valve 136 At the suction end 106 of compressor 101.And when the pressure in intermediate pressure tank 110 is inadequate, it can be by opening intermediate pressure tank pressurization control Higher pressure refrigerant gas at the exhaust end 105 of compressor 101 is transported in intermediate pressure tank 110 by valve 135.Thus, it is possible to will in The pressure in tank 110 is pressed to keep in the desired range.
It, as an example, can be in intermediate pressure tank in order to further ensure the fluid flow direction in intermediate pressure tank 110 First check valve 125.1 is set between the first valve 113.1 and intermediate pressure tank first entrance 112 of one in-let dimple valve group, in middle pressure Second one-way valve 125.2 is set between the second valve 113.2 and intermediate pressure tank first entrance 112 of tank first entrance control valve group.The One check valve 125.1 is opened automatically when the first valve 113.1 of intermediate pressure tank first entrance control valve group is opened, second one-way valve 125.2 are opened automatically when the second valve 113.2 of intermediate pressure tank first entrance control valve group is opened.In intermediate pressure tank first outlet control Check valve (not shown) also can be set in the downstream fluid path of valve 114 processed.
Still as shown in Figure 1, pressure sensor 161 is equipped in intermediate pressure tank 110, for detecting the pressure in intermediate pressure tank 110. It is respectively equipped with pressure sensor 164,162 and 163 in First Heat Exchanger 104, the second heat exchanger 102 and third heat exchanger 103, uses In detection pressure therein.
The heat pump unit of the application further includes control device 230 (as shown in Figure 2), all control valve and pressure in Fig. 1 Sensor is connected to control device 230.
Fig. 2A, 2B and 2C show the exemplary block diagram of the control device 230 of heat pump unit shown in FIG. 1.Such as Fig. 2A institute Show, control device 230 includes bus 242, processor 244, input interface 248, output interface 252 and memory 254, storage Program 256 and data 257 are stored in device 254.Processor 244, input interface 248, output interface 252 and memory 254 With 242 communication connection of bus, processor 244 is enabled to control input interface 248, output interface 252 and memory 254 Operation.Specifically, memory 254 is used to store program 256, instruction and data 257, and processor 244 is read from memory 254 Program fetch 256, instruction and data 257, and data can be written to memory 254.As shown in Figure 2 B, output interface 252 passes through 238 (238.1,238.2,238.3,238.4.....238.9) of connection are respectively connected to each control valve in Fig. 1, including in Press the first valve 113.1 and the second valve 113.2, intermediate pressure tank first outlet control valve 114, intermediate pressure tank of tank first entrance control valve group Supercharger control valve 135, intermediate pressure tank unloading pressure control valve 136, throttling set outlet side control valve group the first valve 118.1, the second valve 118.2 and third valve 118.3 and four-way valve 120.As shown in Figure 2 C, input interface 248 passes through connection 246.2,246.3, 246.4,246.5 connect with the sensor 161,162,163 and 164 in Fig. 1, and can receive heat pump by connecting line 246.1 The operation of unit is requested and other operating parameters.By executing program and instruction in memory 254, processor 244 is controlled The operation of heat pump unit.
Specifically, control device 230, which can be received by input interface 248 from heat pump unit, sends operation request (such as The request sent by control panel) and Fig. 1 in the operating parameter sent of each pressure sensor, and receive heat pump unit Other operating parameters, and control signal is issued to each control valve shown in FIG. 1 by output interface 252.Pass through control figure 1 In each control valve, enable the heat pump unit to run and can be cut between the various modes in different modes It changes.
Fig. 3 A- Fig. 3 D is refrigerant circulation loop when heat pump unit shown in FIG. 1 is run in different modes, wherein arrow Head indicates the flow direction and flow path of refrigerant.Wherein, the refrigerant under separate refrigeration mode (mode one) is shown in Fig. 3 A Circulation loop shows the refrigerant circulation loop under independent heating mode (mode two) in Fig. 3 B, shows simultaneously in Fig. 3 C Freeze and the refrigerant circulation loop under heating mode (mode three), the refrigeration under defrost pattern (mode four) is shown in Fig. 3 D Agent circulation loop.
When table 1 shows heat pump unit and runs in different modes, throttling set outlet side the first valve of control valve group 118.1, the state of the second valve 118.2 and third valve 118.3 and four-way valve 120.The content of table 1 can store in fig. 2 In shown memory 254.
Table 1: when heat pump unit is run under each mode, the state of valve 118.1,118.2,118.3 and 120
In table 1 above, when four-way valve 120 obtains electric, the third interface 120.3 and second interface 120.2 of four-way valve 120 connect It is logical, first interface 120.1 and the 4th interface 120.4.When 120 power loss of four-way valve, the third interface 120.3 of four-way valve 120 and The connection of four interfaces 120.4, first interface 120.1 are connected to second interface 120.2.
By the way that two in three heat exchangers 104,102 and 103 are connected into system with compressor 101 and throttling set 107 Refrigerant circulation loop, while low pressure will be located in two heat exchangers in third heat exchanger and the refrigerant circulation loop The heat exchanger of side is in parallel and spare, and to enable under other modes, the heat pump unit of the application can be with following a variety of Mode operation.
Mode one: separate refrigeration mode
As shown in Fig. 3 A and table 1, if necessary to heat pump unit with separate refrigeration mode operation, pass through control device 230 Control, makes 120 power loss of four-way valve, to be connected to the third interface 120.3 and the 4th interface 120.4 of four-way reversing valve 120, and even Logical first interface 120.1 and second interface 120.2, and open the third valve 118.3 of throttling set outlet side control valve group.Section The second valve 115.2 of device portal side control valve group is flowed due to being that check valve can be automatically switched on.Other valves are turned off.From And after the high-pressure refrigerant that the exhaust end 105 of compressor 101 is discharged first passes through the second heat exchanger 102, by throttling set entrance The arrival end 108 of 115.2 flow throttling device 107 of the second valve of side control valve group fills after becoming low pressure refrigerant by throttling It sets outlet side third valve 118.3 to flow into again in third heat exchanger 103, the suction of compressor 101 is finally flowed into from third heat exchanger 103 The circulation of refrigerant is completed at gas end 106.
In separate refrigeration mode, compressor 101, throttling set 107, the second heat exchanger 102 and third heat exchanger 103 exist In refrigerant circulation loop, the second heat exchanger 102 is used as condenser, and third heat exchanger 103 is as evaporator and passes through second Externally freeze for return pipe 111.2.First Heat Exchanger 104 is spare and in parallel with third heat exchanger 103, First Heat Exchanger 104 Not in refrigerant circulation loop.
Mode two: independent heating mode
As shown in Fig. 3 B and table 1, is run if necessary to heat pump unit with independent heating mode, pass through control device 230 Control makes four-way valve 120 obtain electric third interface 120.3 and second interface 120.2 to be connected to four-way reversing valve 120, and even Logical first interface 120.1 and the 4th interface 120.4, and open the second valve 118.2 of throttling set outlet side control valve group. The first valve 115.1 in throttling set entrance side control valve group is due to being that check valve can be automatically switched on.Other valves are closed. To enter after the high-pressure refrigerant that the exhaust end 105 of compressor 101 is discharged first passes through First Heat Exchanger 104 by throttling set The arrival end 108 of 115.1 flow throttling device 107 of the first valve of mouthful side becomes after low pressure refrigerant by throttling set outlet side Second valve 118.2 of control valve group is flowed into again in the second heat exchanger 102, finally flows into compressor 101 from the second heat exchanger 102 Suction end 106 completes the circulation of refrigerant.
In independent heating mode, compressor 101, throttling set 107, First Heat Exchanger 104 and the second heat exchanger 102 exist In refrigerant circulation loop, First Heat Exchanger 104 is externally heated as condenser and by first for return pipe 111.1, the Two heat exchangers 102 are used as evaporator.Third heat exchanger 103 is spare and in parallel with the second heat exchanger 102, third heat exchanger 103 Not in the circulation loop of refrigerant.
Mode three: while refrigeration and heating mode
As shown in Fig. 3 C and table 1, freezes simultaneously if necessary to heat pump unit and heating mode is run, pass through control device 230 control makes four-way valve 120 obtain electric third interface 120.3 and second interface 120.2 to be connected to four-way reversing valve 120, And it is connected to first interface 120.1 and is connected with the 4th interface 120.4, and make the third valve of throttling set outlet side control valve group 118.3 opening.First valve 115.1 of throttling set entrance side control valve group is due to being that check valve can be automatically switched on.Other Valve is turned off.After high-pressure refrigerant to make the exhaust end 105 of compressor 101 be discharged first passes through First Heat Exchanger 104, pass through The arrival end 108 of 115.1 flow throttling device 107 of the first valve of throttling set entrance side control valve group, becomes low pressure refrigerant It is flowed into third heat exchanger 103 again by the third valve 118.3 of throttling set outlet side control valve afterwards, finally from third heat exchanger 103 flow into the suction end 106 of compressor 101, complete the circulation of refrigerant.
At the same time in refrigeration and heating mode, compressor 101, throttling set 107, First Heat Exchanger 104 and third heat exchange For device 103 in refrigerant circulation loop, First Heat Exchanger 104 is as condenser and external for return pipe 111.1 by first Heating, third heat exchanger 103 externally freeze as evaporator and by second for return pipe 111.2.Second heat exchanger 102 is standby In parallel with and with third heat exchanger 103, the second heat exchanger 102 is not in refrigerant circulation loop.
Mode four: defrost pattern
When heat pump unit runs independent heating mode and lower environment temperature, the second heat exchanger 102 is used as air heat-exchange Device will appear surface frosting, it is necessary to carry out heating defrost to it.
As shown in Fig. 3 D and table 1, run if necessary to heat pump unit with defrost pattern, by the control of control device 230, Make 120 power loss of four-way valve to be connected to the third interface 120.3 and the 4th interface 120.4 of four-way valve 120, and is connected to first interface 120.1 with second interface 120.2, and open the first valve 118.1 of throttling set outlet side control valve group.Throttling set enters Second valve 115.2 of mouth side control valve group is due to being that check valve can be automatically switched on.Other valves are closed.To make compressor After the high-pressure refrigerant that 101 exhaust end 105 is discharged first passes through the second heat exchanger 102, by throttling set entrance side control valve The arrival end 108 of 115.2 flow throttling device 107 of the second valve of group becomes after low pressure refrigerant by throttling set outlet side First valve 118.1 of control valve group is flowed into again in First Heat Exchanger 104, finally flows into compressor air suction from First Heat Exchanger 104 End 106, completes the circulation of refrigerant.
In defrost pattern, compressor 101, throttling set 107, First Heat Exchanger 104 and the second heat exchanger 102 are freezing In agent circulation loop, the second heat exchanger 102 is used as condenser, and externally heating is to make 102 defrost of the second heat exchanger, the first heat exchange Device 104 is used as evaporator.Third heat exchanger 103 is spare and in parallel with First Heat Exchanger 104.At this point, third heat exchanger 103 is not In refrigerant circulation loop.
In heat pump unit during above-mentioned each mode operation, if the supercooling of the refrigerant fluid in condenser is spent Height, the corresponding intermediate pressure tank first entrance control valve 113.1/113.2 of heat exchanger as condenser is opened, into intermediate pressure tank 110 Discharge is as excess refrigerant in the heat exchanger of condenser；If degree of supercooling is no longer excessively high, the intermediate pressure tank first entrance control is closed Valve 113.1/113.2 processed stops discharge excess refrigerant.The hypotony of low-pressure side when if heat pump unit is run, middle pressure Tank first outlet control valve 114 is opened, the refrigerant fluid in intermediate pressure tank 110 by intermediate pressure tank first outlet control valve 114 to Low-pressure side when system is run supplements refrigerant；If pressure is no longer too low, intermediate pressure tank first outlet control valve 114 is closed, is stopped Only supplement refrigerant.The opening and closing of above-mentioned valve 113.1/113.2 and valve 114 are controlled by control device 230.
If heat pump unit switches between above-mentioned each operational mode, needed in some cases to being capable of conduct The First Heat Exchanger 104 or the second heat exchanger 102 that condenser uses carry out pressure discharge operations.Specifically, if in present mode The middle heat exchanger as condenser is used not being re-used as condenser in rear mode, then it is assumed that needs let out the heat exchanger Press operation.
Table 2 is the pattern switching table of heat pump unit shown in FIG. 1.Heat pump unit is summarized in table 2 is carrying out various moulds Whether formula needs to carry out heat exchanger pressure discharge operations when switching.It is also summarized in table 2 in each operational mode in heat pump unit The valve run.Content storage shown in table 2 is in fig. 2 in shown memory 254.Processor 244 reception need by Heat pump unit is switched to after the request of rear operational mode from present mode of operation can be by reading table 2 to determine whether needs Pressure discharge operations are carried out to First Heat Exchanger 104 or the second heat exchanger 102.
Table 2: the pattern switching table of heat pump unit
In table 2, when four-way valve 120 at runtime, four-way valve 120 be in obtain electricity condition；When control valve 118.1, 118.2,118.3,113.1 and 113.2 at runtime, and control valve 118.1,118.2,118.3,113.1 and 113.2, which is in, to be opened State.Specific heat exchanger pressure discharge operations performed by heat pump unit include:
Operation one: First Heat Exchanger 104 and the first entrance 112 of intermediate pressure tank 110 are in fluid communication, described first is changed Discharge refrigerant in hot device 104 is into medium pressure tank 110.Wherein, operation one corresponds to the valve opened in above-mentioned table 2 113.1 (i.e. the first valves 113.1 of intermediate pressure tank first entrance control valve group).
Operation two: the second heat exchanger 102 and the first entrance 112 of intermediate pressure tank 110 are in fluid communication, described second is changed Discharge refrigerant in hot device 102 is into medium pressure tank 110.Wherein, operation two corresponds to the valve opened in above-mentioned table 2 113.2 (i.e. the second valves 113.2 of intermediate pressure tank first entrance control valve group).
As shown in table 2, if necessary to cut the operational mode of heat pump unit from separate refrigeration mode (present mode of operation) It is changed to independent heating mode or simultaneously refrigeration and heating mode (in rear operational mode), it is cold due to being used as in separate refrigeration mode Second heat exchanger 102 of condenser freezes in independent heating mode or simultaneously and is not re-used as condenser use in heating mode, because This needs to carry out pressure discharge operations to the second heat exchanger 102.Pressure discharge operations are carried out to the second heat exchanger 102 and need to be implemented aforesaid operations Two.
If necessary to which the operational mode of heat pump unit is switched to independent system from independent heating mode (present mode of operation) Cold mode or defrost pattern (in rear operational mode), due in independent heating mode as the First Heat Exchanger of condenser 104 Condenser use it is not re-used as in separate refrigeration mode or defrost pattern, it is therefore desirable to which pressure release is carried out to First Heat Exchanger 104 Operation.Pressure discharge operations are carried out to First Heat Exchanger 104 and need to be implemented aforesaid operations one.
If necessary to which the operational mode of heat pump unit is switched to from refrigeration and heating mode (present mode of operation) simultaneously Separate refrigeration mode (in rear operational mode), due to freezing at the same time and the First Heat Exchanger in heating mode as condenser 104 are not re-used as condenser use in separate refrigeration mode, it is therefore desirable to carry out pressure discharge operations to First Heat Exchanger 104.It is right First Heat Exchanger 104 carries out pressure discharge operations and needs to be implemented aforesaid operations one.
If necessary to which the operational mode of heat pump unit is switched to individually heating mould from defrost pattern (present mode of operation) Formula (in rear operational mode), due to the second heat exchanger 102 in defrost pattern as condenser in independent heating mode not It is re-used as condenser use, it is therefore desirable to which pressure discharge operations are carried out to the second heat exchanger 102.Pressure release is carried out to the second heat exchanger 102 Operation needs to be implemented aforesaid operations two.
Still as shown in table 2, if necessary to by the operational mode of heat pump unit independent heating mode with simultaneously refrigeration and It is switched between heating mode, due to using First Heat Exchanger 104 as condenser in above two operational mode, because This is not necessarily to carry out pressure discharge operations to any heat exchanger.
Fig. 4 shows the flow chart that the heat pump unit in control figure 1 carries out the method 400 of operational mode switching.Diagram side The step of method 400, is stored in the memory 254 of control device 230 and is executed by controller 230.As shown in figure 4, method 400 the following steps are included:
Step 450: reception pattern switching request, i.e. request switch to heat pump unit in rear operation from present mode of operation Mode.Wherein, control device 230 passes through its 248 reception pattern switching request of input interface.Mode switch request can for example lead to It crosses the user interface connecting with input interface 248 to be inputted by operator, can also be sent out automatically according to the operating parameter of heat pump unit It send.
Step 451: judging whether to need to carry out pressure discharge operations to First Heat Exchanger 104 or the second heat exchanger 102.Wherein, Control device 230 is judged by the table 2 being stored in memory 254 if the operational mode of heat pump unit transported from current Row pattern switching is requested in rear operational mode to step 450, if needs to First Heat Exchanger 104 or the second heat exchanger 102 carry out pressure discharge operations.If it is determined that needing to carry out First Heat Exchanger 104 pressure discharge operations, control device 230 turns to step 4521；If it is determined that needing to carry out the second heat exchanger 102 pressure discharge operations, control device 230 turns to step 4522；If it is determined that When without carrying out pressure discharge operations to First Heat Exchanger 104 or the second heat exchanger 102, control device 230 turns to step 460.
Step 4521: executing aforesaid operations one, then turn to step 4531.By executing operation one, intermediate pressure tank first enters First valve 113.1 of mouth control valve group is opened, and First Heat Exchanger 104 and intermediate pressure tank first entrance 112 are in fluid communication, thus institute Stating the refrigerant in First Heat Exchanger 104 can be discharged into medium pressure tank 110.
Step 4522: executing aforesaid operations two, then turn to step 4532.By executing operation two, intermediate pressure tank first enters Second valve 113.2 of mouth control valve group is opened, and the second heat exchanger 102 is in fluid communication with intermediate pressure tank first entrance 112, thus institute The refrigerant stated in the second heat exchanger 102 can be discharged into medium pressure tank 110.
Step 4531: judge whether by the first predetermined time, if it is, indicate that pressure discharge operations are completed, control device 230 turn to step 4581, if it is not, then control device 230 continues to execute step 4531, until judgement is by the first pre- timing Between.First predetermined time can determine according to refrigerating capacity/heating capacity of heat pump unit.As an example, the first pre- timing Between be 30-60 seconds or so.
Step 4532: judging whether by the second predetermined time, if it is, indicating that pressure discharge operations are completed, turn to and execute Step 4582, if it is not, then control device 230 continues to execute step 4532, until judgement passed through for the second predetermined time.Second is pre- Fixing time can also determine according to refrigerating capacity/heating capacity of heat pump unit.As an example, the second predetermined time is for example 30-60 seconds or so.Second preset time can be identical or different with the first preset time.
Step 4581: executing operation three: First Heat Exchanger 104 and intermediate pressure tank first entrance 112 being disconnected, then turn to walk Rapid 460.Aforesaid operations three, which correspond to, closes valve 113.1 (i.e. the first valve 113.1 of intermediate pressure tank first entrance control valve group).
Step 4582: executing operation four: the second heat exchanger 102 being disconnected with intermediate pressure tank first entrance 112, then turns to walk Rapid 460.Aforesaid operations three, which correspond to, closes valve 113.2 (i.e. the second valve 113.2 of intermediate pressure tank first entrance control valve group).
Step 460: operating in rear operational mode and stop present mode of operation, complete pattern switching.
In step 460, operating in rear operational mode needs control corresponding valve in rear operational mode to make its operation.Respectively Kind corresponding valve to be run in rear operational mode is listed in table 2.Specifically, if being individually to make in rear operational mode Heat pattern runs valve 120 (i.e. four-way valve 120) and (i.e. the second valve of throttling set outlet side control valve group of valve 118.2 118.2)；If being separate refrigeration mode, operation (the i.e. throttling set outlet side control valve group of valve 118.3 in rear operational mode Third valve 118.3)；If being to freeze simultaneously and heating mode in rear operational mode, operation valve 120 (i.e. four-way valve 120) and valve 118.3 (i.e. the third valves 118.3 of throttling set outlet side control valve group)；If being defrost pattern, operation in rear operational mode Valve 118.1 (i.e. the first valve 118.1 of throttling set outlet side control valve group).
In step 460, stopping present mode of operation, which needs to control corresponding valve in present mode of operation, makes its stop fortune Row.Corresponding valve to be controlled is listed in table 2 in various present mode of operations.Specifically, if present mode of operation is Independent heating mode, valve 120 and valve 118.2 out of service；If present mode of operation is separate refrigeration mode, valve out of service 118.3；If present mode of operation be simultaneously freeze and heating mode, valve 120 and valve 118.3 out of service；If current fortune Row mode is defrost pattern, valve 118.1 out of service.
It should be noted that, although in step 460, operating in rear operational mode and stopping present mode of operation same It is carried out in step, but according to the application others embodiment, rear operational mode can also be first operated in, after certain time-delay Stop present mode of operation again.
According to the application, control device 230 be can be additionally configured to, when after operational mode bring into operation after and rear When the refrigerant circulation loop of operational mode requires supplementation with refrigerant, can make heat pump unit execute operation five, i.e., will be described in The outlet end 109 of tank first outlet 128 and the throttling set 107 is pressed to be in fluid communication, so that the refrigerant stream in intermediate pressure tank 110 Body can add in refrigerant circuit.Aforesaid operations five, which correspond to, opens intermediate pressure tank first outlet control valve 114.Control device 230 can be additionally configured to, when executing operation five, when pressure sensor 161 detects that the pressure in intermediate pressure tank 110 is low When the first preset pressure value, intermediate pressure tank supercharger control valve 135 is opened, so that intermediate pressure tank second entrance 181 and compressor 101 Exhaust end 105 is in fluid communication.Thereby, it is possible to increase the pressure in intermediate pressure tank 110, to guarantee the refrigerant in intermediate pressure tank 110 Fluid can add in refrigerant circulation loop.As an example, control device 230 is configured as when in intermediate pressure tank 110 Pressure rise above the pressure at intermediate pressure tank first outlet 128 after, close intermediate pressure tank supercharger control valve 135.
According to the application, control device 230 be can be additionally configured to, when executing aforesaid operations one or operation two, When pressure sensor 161 detects that the pressure in intermediate pressure tank 110 is higher than the second preset pressure value, then intermediate pressure tank pressure release control is opened Valve 136 processed, so that the suction end 106 of the second outlet 182 of intermediate pressure tank 110 and compressor 101 is in fluid communication.Thereby, it is possible to drop Pressure in low intermediate pressure tank 110, to guarantee that the high-pressure refrigerant in First Heat Exchanger 104 or the second heat exchanger 102 can be arranged Enter in intermediate pressure tank 110.As an example, during the pressure that control device 230 is configured as working as in intermediate pressure tank 110 drops below After pressing the pressure at tank first entrance 112, intermediate pressure tank unloading pressure control valve 136 can be closed.
Above-mentioned first preset pressure value and the second preset pressure value can be set according to pressure limit needed for intermediate pressure tank 110 It sets.
In addition, according to the application, in order to further ensure that the validity of running mode switching, control device 230 can be with It is configured as after the completion of pattern switching, the system in each heat exchanger is detected by the corresponding pressure sensor 164/162 in Fig. 1 Whether still there are elevated pressures in heat exchanger of the refrigerant pressure to judge to have carried out pressure discharge operations.If it is, being judged as mould Formula handover failure, control device 230 stop heat pump unit.
Fig. 5 A shows the heat pump unit in Fig. 1 and is being switched to from separate refrigeration mode (mode one) while freezing and heat When mode (mode three), refrigerant flows to schematic diagram.Below with from separate refrigeration pattern switching be simultaneously freeze and heat mould For some operations when formula, illustrate how to carry out pressure discharge operations to the heat exchanger for needing pressure release.
If the operational mode of heat pump unit will be shown in Fig. 3 C from separate refrigeration pattern switching shown in Fig. 3 A Refrigeration and heating mode, the second heat exchanger 102 will be switched to spare heat exchanger from the high-side heat exchanger as condenser, because This needs to carry out pressure release to the second heat exchanger 102.
As shown in Figure 5A, when heat pump unit is also under the operating status of separate refrigeration mode, intermediate pressure tank first is first opened Second valve 113.2 of in-let dimple valve group flows the second port 121.2 of the second heat exchanger 102 with intermediate pressure tank first entrance 112 Body connection, so that the high-pressure refrigerant liquid in the second heat exchanger 102 is discharged into intermediate pressure tank 110.
The pressure discharge operations of second heat exchanger 102 shown in Fig. 5 A terminate after by the second predetermined time.To terminate the The pressure discharge operations of two heat exchangers 102 close the second valve 113.2 of intermediate pressure tank first entrance control valve group, by the second heat exchanger 102 Second port 121.2 and intermediate pressure tank first entrance 112 disconnect.Then obtain it by control four-way valve 120 electric to be connected to four The third interface 120.3 and second interface 120.2 of logical reversal valve 120, and it is connected to the 4th interface 120.4 and first interface 120.1, can by operational mode from separate refrigeration pattern switching be simultaneously refrigeration and heating mode.Due to separate refrigeration mode and Simultaneously in refrigeration and heating mode, the third valve 118.3 of throttling set outlet side control valve is opened, and there is no need to third valve 118.3 are operated, that is, be can switch to while being freezed and heating mode.
Fig. 5 B show the heat pump unit in Fig. 1 freeze at the same time and heating mode under when running, refrigerant circulation is returned Road carries out the flow path of the refrigerant of fluid infusion operation.
When heat pump unit is operated normally with its four kinds of operational modes, refrigerant circulation loop may be supplemented The operation of refrigerant.For example, freezing while heat pump unit separate refrigeration pattern switching shown in Fig. 5 A is shown in Fig. 5 B After heating mode, while freezing may the pressure discharge operations as shown in Fig. 5 A with the refrigerant circulation loop in heating mode And require supplementation with refrigerant.For this purpose, as shown in Figure 5 B, intermediate pressure tank first outlet control valve 114 is opened, by medium pressure tank the One outlet 128 and the outlet end 109 of the throttling set 107 are in fluid communication, and the refrigerant in intermediate pressure tank 110 is enable to add to In refrigerant circulation loop.Meanwhile if insufficient pressure in intermediate pressure tank 110, intermediate pressure tank supercharger control valve can be opened 135, so that intermediate pressure tank second entrance 181 is connected to the exhaust end 105 of compressor 101, to increase the pressure in intermediate pressure tank 110, To guarantee that the refrigerant fluid in intermediate pressure tank 110 can add in refrigerant circulation loop.
By carrying out pressure discharge operations to the heat exchanger for needing to carry out pressure discharge operations in pattern switching, mode is on the one hand avoided On high-tension side heat exchanger is switched to the heat exchanger bring compression shock of low-pressure side when switching, on the other hand but also the high-pressure side The liquid refrigerant that remains in heat exchanger after handover of heat exchanger be not enough to be brought into compressor from the suction end of compressor Cause liquid hammer.In addition, the pressure difference of one side pressure leak process is smaller using the above-mentioned mode switching method of the application, when pressure release Oscillation intensity is also smaller, and the time of another aspect handoff procedure is short and corresponding impact force is also smaller.It can be considered that should Handoff procedure is one compared to the more steady and effective handoff procedure of normal shutdown switching mode.
As an example, when needing switch mode, off-load processing first can be carried out to compressor 101, to make heat The refrigerant that refrigerant circulation is participated in pump assembly is reduced, to allow refrigerant is as much as possible to be discharged into intermediate pressure tank 110. Simultaneously by reducing suction, the capacity of compressor, so that corresponding impact force also can be smaller when pattern switching.
In addition, receiving and supplementing refrigerant when can reduce pattern switching by intermediate pressure tank 110, pressure jump is caused to machine The impact of group, extends the service life of each component, and improve unit reliability of operation and stability.Pass through intermediate pressure tank simultaneously Refrigerant in the refrigerant circulation loop of heat pump unit under 110 pairs of normal operation modes makes reasonable control, Neng Gouti High unit reliability of operation and Energy Efficiency Ratio.
Fig. 6 is the block diagram of another embodiment of the heat pump unit of the application.In order to further increase the energy of heat pump unit Effect ratio and operation stability, provide heat pump unit embodiment as shown in FIG. 6.Embodiment shown in fig. 6 includes owning in Fig. 1 Component, and oil eliminator 630, device for drying and filtering 632 and economizer 634 are increased in heat pump unit shown in Fig. 1.
As shown in fig. 6, oil eliminator 630 is located between the exhaust end 105 and four-way reversing valve 120 of compressor 101, it is used for The oil being discharged in separation compressor 101.Device for drying and filtering 632 is located at 108 upstream of arrival end of throttling set 107, for wanting Filtering is dried in the high-pressure refrigerant liquid of flow throttling device 107.Economizer 634 is located at the downstream of device for drying and filtering 632, The cold side inlet of crossing of the outlet of device for drying and filtering 632 and economizer 634 is connected, economizer 634 cross cold side liquid outlet with The arrival end 108 of throttling set 107 is connected, and the gas outlet of economizer 634 is connected with the gas supplementing opening of compressor 101.To System degree of supercooling can be further increased, displacement is increased, improves unit performance.
Although the application will be described with reference to the specific embodiment shown in attached drawing, but it is to be understood that not Under the spirit and scope and background of the application introduction, the heat pump unit of the application can be there are many version.This field Technology those of ordinary skill will additionally appreciate different modes to change the CONSTRUCTED SPECIFICATION in embodiment disclosed in the present application, It each falls in the application and spirit and scope of the claims.

Claims (20)

1. a kind of heat pump unit, characterized by comprising:
Compressor (101), the compressor (101) include suction end (106) and exhaust end (105)；
Throttling set (107), the throttling set (107) include arrival end (108) and outlet end (109)；
First Heat Exchanger (104), the second heat exchanger (102) and third heat exchanger (103), the First Heat Exchanger (104) include First port (116.1) and second port (116.2), second heat exchanger (102) include first port (121.1) and second Port (121.2), the third heat exchanger (103) include first port (123.1) and second port (123.2)；And
Intermediate pressure tank (110), medium pressure tank (110) are equipped with intermediate pressure tank first entrance (112)；
Wherein, the first port of the first port (116.1) of the First Heat Exchanger (104) and second heat exchanger (102) (121.1) controllably with the suction end (106) of the compressor (101) be in fluid communication, and controllably with the compressor (101) exhaust end (105) is in fluid communication, and wherein, the first port (123.1) of the third heat exchanger (103) and institute The suction end (106) for stating compressor (101) is in fluid communication；And
Wherein, the second port of the second port (116.2) of the First Heat Exchanger (104) and second heat exchanger (102) (121.2) controllably with the arrival end (108) of the throttling set (107) be in fluid communication, controllably with the throttling set (107) outlet end (109) is in fluid communication, and is controllably in fluid communication with medium pressure tank first entrance (112), and wherein, The second port (123.2) of the third heat exchanger (103) is controllably flowed with the outlet end (109) of the throttling set (107) Body connection.
2. heat pump unit as described in claim 1, it is characterised in that further include:
Four-way valve (120), the four-way valve (120) have first interface (120.1), second interface (120.2), third interface (120.3) and the 4th interface (120.4)；
Wherein, the second interface of the first port (116.1) of the First Heat Exchanger (104) and the four-way valve (120) (120.2) it connects, the first port (121.1) of second heat exchanger (102) and the 4th interface of the four-way valve (120) (120.4) it connects, the suction end (106) of the compressor (101) and the first interface (120.1) of the four-way valve (120) connect It connects, and the exhaust end (105) of the compressor (101) is connect with the third interface (120.3) of the four-way valve (120).
3. heat pump unit as claimed in claim 2, it is characterised in that further include:
Throttling set entrance side control valve group (115.1,115.2), the throttling set entrance side control valve group (115.1, It 115.2) include the first valve (115.1) and the second valve (115.2), wherein the second port of the First Heat Exchanger (104) (116.2) and the second port (121.2) of second heat exchanger (102) passes through the throttling set entrance side control valve respectively The first valve (115.1) and the second valve (115.2) of group (115.1,115.2) the controllably entrance with the throttling set (107) (108) are held to be in fluid communication；And
Throttling set outlet side control valve group (118.1,118.2,118.3), the throttling set outlet side control valve group It (118.1,118.2,118.3) include the first valve (118.1), the second valve (118.2) and third valve (118.3), wherein described the The second port (116.2) of one heat exchanger (104) and the second port (121.2) of second heat exchanger (104) pass through respectively The first valve (118.1) and the second valve (118.2) of the throttling set outlet side control valve group (118.1,118.2,118.3) can Control ground and the outlet end (109) of the throttling set (107) are in fluid communication, the second port of the third heat exchanger (103) (123.2) controllable by the third valve (118.3) in the throttling set outlet side control valve group (118.1,118.2,118.3) The outlet end (109) of ground and the throttling set (107) is in fluid communication.
4. heat pump unit as claimed in claim 3, it is characterised in that:
Medium pressure tank (110) is additionally provided with intermediate pressure tank first outlet (128), medium pressure tank first outlet (128) controllably with The outlet end (109) of the throttling set (107) is in fluid communication；
The heat pump unit further include:
Intermediate pressure tank first entrance control valve group (113.1,113.2), medium pressure tank first entrance control valve group (113.1, It 113.2) include the first valve (113.1) and the second valve (113.2), wherein the second port of the First Heat Exchanger (104) (116.2) and the second port (121.2) of second heat exchanger (102) passes through medium pressure tank first entrance control valve respectively The first valve (113.1) and the second valve (113.2) of group (113.1,113.2) controllably with medium pressure tank first entrance (112) It is in fluid communication；And
Intermediate pressure tank first outlet control valve (114), medium pressure tank first outlet (128) pass through the first outlet control of medium pressure tank Valve (114) processed is controllably in fluid communication with the outlet end (109) of the throttling set (107).
5. heat pump unit as claimed in claim 4, it is characterised in that further include:
Intermediate pressure tank supercharger control valve (135) and intermediate pressure tank unloading pressure control valve (136), medium pressure tank (110) include intermediate pressure tank Two entrances (181) and intermediate pressure tank second outlet (182), wherein medium pressure tank second entrance (181) is increased by medium pressure tank Pressure control valve (135) is connected on the fluid path between the exhaust end (105) of compressor (101) and four-way valve (120), described Intermediate pressure tank second outlet (182) is connected to the suction end of compressor (101) by medium pressure tank unloading pressure control valve (136) (106)。
6. heat pump unit as claimed in claim 4, it is characterised in that medium pressure tank first entrance control valve group further include:
First check valve (125.1) and second one-way valve (125.2), wherein first check valve (125.1) is connected to described The first valve (113.1) of intermediate pressure tank first entrance control valve group (113.1,113.2) and medium pressure tank first entrance (112) it Between, the second one-way valve (125.2) is connected to the second valve of medium pressure tank first entrance control valve group (113.1,113.2) (113.2) between medium pressure tank first entrance (112).
7. heat pump unit as claimed in claim 5, it is characterised in that:
The first valve (115.1) and the second valve (115.2) of the throttling set entrance side control valve group (115.1,115.2) are single To valve.
8. heat pump unit as described in claim 1, it is characterised in that:
The First Heat Exchanger (104) and the third heat exchanger (103) are supplied with first for return pipe (111.1) and second respectively Return pipe (111.2) connection.
9. heat pump unit as claimed in claim 5, it is characterised in that further include:
Control device (230), the four-way valve (120), the throttling set outlet side control valve group (118.1,118.2, 118.3), medium pressure tank first entrance control valve group (113.1,113.2), medium pressure tank first outlet control valve (114), Medium pressure tank supercharger control valve (135) and medium pressure tank unloading pressure control valve (136) are connected to the control device (230) simultaneously It is controlled by the control device (230).
10. heat pump unit as described in claim 1, it is characterised in that:
The heat pump unit is configured as, by control refrigerant in the compressor (101), the throttling set (110), institute State the flow path in First Heat Exchanger (104), second heat exchanger (102) and third heat exchanger (103), the heat pump machine Group can run in different modes and can switch between the various modes, also, when the First Heat Exchanger (104) and It, can be by described when any one in second heat exchanger (102) needs to carry out in pattern switching pressure discharge operations Tank (110) are pressed to receive high-pressure refrigerant therein.
11. a kind of method for controlling heat pump unit, the heat pump unit includes compressor (101), throttling set (107), first Heat exchanger (104), the second heat exchanger (102), third heat exchanger (103) and intermediate pressure tank (110), the heat pump unit can be with more Kind operational mode operation, wherein in the plurality of operating modes, the First Heat Exchanger (104) or the second heat exchanger (102) It can be used as condenser, it is characterised in that:
The described method includes:
When needing to be switched to the heat pump unit in rear operational mode from present mode of operation, judge whether to need to first Heat exchanger (104) or the second heat exchanger (102) carry out pressure discharge operations；
When judgement needs to carry out pressure discharge operations to First Heat Exchanger (104), present mode of operation is kept, and executes following operation One:
Operation one: the first entrance (112) of First Heat Exchanger (104) and medium pressure tank (110) is in fluid communication, will be described Discharge refrigerant in First Heat Exchanger (104) is in medium pressure tank (110)；Or
When judgement needs to carry out pressure discharge operations to the second heat exchanger (102), present mode of operation is kept, and executes following operation Two:
Operation two: the first entrance (112) of the second heat exchanger (102) and medium pressure tank (110) is in fluid communication, will be described Discharge refrigerant in second heat exchanger (102) is in medium pressure tank (110).
12. method according to claim 11, it is characterised in that further include:
After the first predetermined time for executing the operation one, following operation three is executed:
Operation three: the first entrance (112) of First Heat Exchanger (104) and medium pressure tank (110) is disconnected；Or described in the execution After second predetermined time of operation two, following operation four is executed:
Operation four: the first entrance (112) of the second heat exchanger (102) and medium pressure tank (110) is disconnected.
13. method according to claim 12, it is characterised in that further include:
After execution operation three or operation four, in rear operational mode and the stopping present mode of operation described in operation.
14. method according to claim 11, it is characterised in that further include:
When it is described after operational mode bring into operation after, if the refrigerant circulation loop in rear operational mode requires supplementation with Refrigerant executes operation five:
Operation five: the outlet end (109) of the first outlet (128) of medium pressure tank (110) and the throttling set (107) is flowed Body connection.
15. 4 the method according to claim 1, it is characterised in that further include:
When executing operation five, when the pressure in medium pressure tank (110) is lower than the first preset pressure value, described in fluid communication The second entrance (181) of intermediate pressure tank and the exhaust end (105) of the compressor, to increase the pressure in medium pressure tank (110).
16. method according to claim 11, it is characterised in that further include:
When executing operation one or operation two, when the pressure in intermediate pressure tank (110) is higher than the second preset pressure value, it is in fluid communication The second outlet (182) of medium pressure tank and the suction end (106) of the compressor (101), to reduce medium pressure tank (110) In pressure.
17. method according to claim 11, which is characterized in that it is described judge whether to need to First Heat Exchanger (104) or Second heat exchanger (102) carry out pressure discharge operations the step of include:
When the First Heat Exchanger (104) or second heat exchanger (102) in the present mode of operation be used as condenser, And it is described be not re-used as condenser in rear operational mode when, judge to need to the First Heat Exchanger (104) or described the Two heat exchangers (102) carry out pressure discharge operations.
18. 7 the method according to claim 1, it is characterised in that:
The plurality of operating modes includes separate refrigeration mode, independent heating mode while refrigeration and heating mode and defrost Mode；And
The First Heat Exchanger (104) and the third heat exchanger (103) are supplied with first for return pipe (111.1) and second respectively Return pipe (111.2) connection.
19. 8 the method according to claim 1, it is characterised in that:
When the heat pump unit is with the separate refrigeration mode operation, the compressor (101), the throttling set (107), Second heat exchanger (102) and the third heat exchanger (103) are in refrigerant circulation loop, wherein in the independent system In cold mode, second heat exchanger (102) is used as condenser；
When the heat pump unit is run with the independent heating mode, the compressor (101), the throttling set (107), The First Heat Exchanger (104) and second heat exchanger (102) are in refrigerant circulation loop, wherein in the independent system In heat pattern, the First Heat Exchanger (104) is used as condenser；
When the heat pump unit is with described while refrigeration and heating mode operation, the compressor (101), the throttling set (107), the First Heat Exchanger (104) and the third heat exchanger (103) are in refrigerant circulation loop, wherein described Simultaneously in refrigeration and heating mode, the First Heat Exchanger (104) is used as condenser；And
It is the compressor (101), the throttling set (107), described when the heat pump unit is run with the defrost pattern In refrigerant circulation loop, second heat exchanger (102) is made for First Heat Exchanger (104) and second heat exchanger (102) For condenser.
20. 9 the method according to claim 1, which is characterized in that it is described judge whether to need to First Heat Exchanger (104) or Second heat exchanger (102) carry out pressure discharge operations the step of include:
When the present mode of operation be the separate refrigeration mode, it is described after operational mode be the independent heating mode or When freezing with heating mode simultaneously described in person, judge to need to carry out pressure discharge operations to second heat exchanger (102)；
When the present mode of operation be the independent heating mode, it is described after operational mode be the separate refrigeration mode or When the defrost pattern, judge to need to carry out pressure discharge operations to the First Heat Exchanger (104)；
When the present mode of operation be the refrigeration simultaneously with heating mode, it is described after operational mode be the separate refrigeration When mode, judge to need to carry out pressure discharge operations to the First Heat Exchanger (104)；Or
When the present mode of operation is the defrost pattern, described when rear operational mode is the independent heating mode, sentence It is disconnected to need to carry out pressure discharge operations to second heat exchanger (102).
CN201811113760.8A 2017-09-30 2018-09-25 Heat pump unit and method for controlling heat pump unit Active CN109595846B (en)

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