CN105928266B - Multi-line system and its control method for heating restricting element - Google Patents

Multi-line system and its control method for heating restricting element Download PDF

Info

Publication number
CN105928266B
CN105928266B CN201610348574.7A CN201610348574A CN105928266B CN 105928266 B CN105928266 B CN 105928266B CN 201610348574 A CN201610348574 A CN 201610348574A CN 105928266 B CN105928266 B CN 105928266B
Authority
CN
China
Prior art keywords
compressor
superheat
pressure
heating
degree
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.)
Active
Application number
CN201610348574.7A
Other languages
Chinese (zh)
Other versions
CN105928266A (en
Inventor
罗彬�
李元阳
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.)
Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
Original Assignee
Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
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 Midea Group Co Ltd, Guangdong Midea HVAC Equipment Co Ltd filed Critical Midea Group Co Ltd
Priority to CN201610348574.7A priority Critical patent/CN105928266B/en
Publication of CN105928266A publication Critical patent/CN105928266A/en
Application granted granted Critical
Publication of CN105928266B publication Critical patent/CN105928266B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22Means for preventing condensation or evacuating condensate
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B29/00Combined heating and refrigeration systems, e.g. operating alternately or simultaneously
    • F25B29/003Combined heating and refrigeration systems, e.g. operating alternately or simultaneously of the compression type system
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plant or systems
    • F25B49/022Compressor control arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22Means for preventing condensation or evacuating condensate
    • F24F2013/221Means for preventing condensation or evacuating condensate to avoid the formation of condensate, e.g. dew
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/023Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0231Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units with simultaneous cooling and heating
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/029Control issues
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/031Sensor arrangements
    • F25B2313/0313Pressure sensors near the outdoor heat exchanger
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2400/00General 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
    • F25B2400/04Refrigeration circuit bypassing means
    • F25B2400/0411Refrigeration circuit bypassing means for the expansion valve or capillary tube
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2400/00General 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
    • F25B2400/07Details of compressors or related parts
    • F25B2400/077Compressor control units, e.g. terminal boxes, mounted on the compressor casing wall containing for example starter, protection switches or connector contacts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/02Compressor control
    • F25B2600/027Compressor control by controlling pressure
    • F25B2600/0271Compressor control by controlling pressure the discharge pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2513Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19Pressures
    • F25B2700/193Pressures of the compressor
    • F25B2700/1931Discharge pressures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2115Temperatures of a compressor or the drive means therefor
    • F25B2700/21152Temperatures of a compressor or the drive means therefor at the discharge side of the compressor

Abstract

The invention discloses a kind of multi-line system and its control methods of heating restricting element, the described method comprises the following steps:Obtain the target exhaust pressure of compressor or the corresponding saturation temperature of target exhaust pressure;Compressor is controlled according to target exhaust pressure or target exhaust pressure corresponding saturation temperature, and the current exhaust degree of superheat of compressor is obtained after compressor stable operation;The target exhaust degree of superheat of compressor is obtained, and judges whether the current exhaust degree of superheat is less than the target exhaust degree of superheat;If the current exhaust degree of superheat is less than the target exhaust degree of superheat, aperture then is carried out to heating restricting element and turns control down, until when the difference between the high-pressure and middle pressure pressure of part flow arrangement is less than the first preset value or receives the hydrops signal of heating indoor unit, forbid turning down the aperture of heating restricting element, so as to ensure that system has the higher degree of superheat, make system in heating, especially under sub-load heating, there is better performance and efficiency.

Description

Multi-line system and its control method for heating restricting element
Technical field
The present invention relates to air-conditioning technical field, the control method of restricting element is heated in more particularly to a kind of multi-line system And a kind of multi-line system.
Background technology
Multi-line system has four kinds of pure refrigeration, pure heating, main refrigeration and main heating patterns.Wherein, main refrigeration mode and Main heating mode can utilize the condensation heat and heat of evaporation of system simultaneously, realize and freeze simultaneously and heat, substantially increase system Efficiency.
In multi-line system operational process, the high pressure gas of outdoor unit high-voltage tube enters heating indoor unit, in heating chamber After machine heat release, low-pressure gas is expanded by electric expansion valve and returns to outdoor unit.The aperture of electric expansion valve can be influenced into system The refrigerant flow of hot indoor unit, while the condensation temperature of heating indoor unit can be also adjusted, suitable aperture can make in heating chamber Machine both has higher refrigerant flow simultaneously or has higher condensation temperature, so as to export higher heating capacity.
The content of the invention
It is contemplated that it solves at least some of the technical problems in related technologies.
For this purpose, an object of the present invention is to provide in a kind of multi-line system heat restricting element control method, This method is adjusted the aperture for heating restricting element by the discharge superheat of compressor, and the high pressure for passing through part flow arrangement Difference between pressure and middle pressure pressure, chance occurs forbidding turning down opening for heating restricting element during hydrops state in heating chamber Degree so as to ensure that system has the higher degree of superheat, makes system under heating, especially under sub-load heating, has more preferable Performance and efficiency.
It is another object of the present invention to propose a kind of multi-line system.
To achieve the above object, one aspect of the present invention embodiment, which proposes, heats restricting element in a kind of multi-line system Control method, which is characterized in that the multi-line system includes outdoor unit, part flow arrangement and multiple indoor units, the outdoor unit Including compressor, the part flow arrangement includes First Heat Exchanger, the second heat exchanger and heating restricting element, the First Heat Exchanger The outlet entrance that exchanges heat flow path with the first of second heat exchanger of the first heat exchange flow path be connected, second heat exchanger The outlet of the second heat exchange flow path be connected with the entrance of the second of the First Heat Exchanger the heat exchange flow path, the heating throttling is first Part is arranged on the outlet of the first heat exchange flow path of second heat exchanger and entering for the second heat exchange flow path of second heat exchanger Between mouthful, it the described method comprises the following steps:Obtain the target exhaust pressure of the compressor or the target exhaust pressure Corresponding saturation temperature;According to the target exhaust pressure or the corresponding saturation temperature of the target exhaust pressure to the pressure Contracting machine is controlled such that the compressor stable operation, and working as the compressor is obtained after the compressor stable operation The front exhaust degree of superheat;The target exhaust degree of superheat of the compressor is obtained, and judges whether the current exhaust degree of superheat is less than The target exhaust degree of superheat;And if the current exhaust degree of superheat is less than the target exhaust degree of superheat, to described Heating restricting element carries out aperture and turns control down, until the difference between the high-pressure and middle pressure pressure of the part flow arrangement is small When in the first preset value or receiving the hydrops signal of heating indoor unit, forbid turning down the aperture of the heating restricting element.
The control method of restricting element is heated in multi-line system according to embodiments of the present invention, obtains compressor first The target exhaust pressure either corresponding saturation temperature of target exhaust pressure and according to target exhaust pressure or target exhaust pressure Corresponding saturation temperature is controlled such that compressor compressor stable operation, and compression is obtained after compressor stable operation The current exhaust degree of superheat of machine.Then, the target exhaust degree of superheat of compressor is obtained, and judges whether the current exhaust degree of superheat is small In the target exhaust degree of superheat, if the current exhaust degree of superheat is less than the target exhaust degree of superheat, heating restricting element is opened Degree turns control down, until the difference between the high-pressure and middle pressure pressure of part flow arrangement is less than the first preset value or receives When heating the hydrops signal of indoor unit, forbid turning down the aperture of heating restricting element, so as to ensure that system has higher overheat Degree, makes system under heating, especially under sub-load heating, has better performance and efficiency.
According to one embodiment of present invention, if the current exhaust degree of superheat is more than the target exhaust degree of superheat, Aperture then is carried out to the heating restricting element and tunes up control.
According to one embodiment of present invention, after the aperture to the heating restricting element is adjusted, further include:Sentence Whether the current exhaust degree of superheat of breaking is equal to the target exhaust degree of superheat, and judges the current exhaust pressure of the compressor Whether corresponding saturation temperature is more than or equal to described in the corresponding saturation temperature of target exhaust pressure and the judgement of the compressor Whether the running frequency of compressor is more than or equal to peak frequency;If the current exhaust degree of superheat is equal to the target exhaust mistake The corresponding saturation temperature of the current exhaust pressure of temperature or the compressor is more than or equal to the target exhaust pressure of the compressor The corresponding saturation temperature of power or the running frequency of the compressor are more than or equal to the peak frequency, then control the heating The aperture of restricting element remains unchanged.
According to one embodiment of present invention, if the current exhaust degree of superheat is overheated not equal to the target exhaust The target exhaust pressure that degree, the corresponding saturation temperature of the current exhaust pressure of the compressor are less than the compressor is corresponding full It is less than the peak frequency with temperature and the running frequency of the compressor, then the running frequency of the compressor is adjusted Section, and the aperture of the heating restricting element is adjusted according to the running frequency of the compressor after adjusting.
According to one embodiment of present invention, the multi-line system is operated in heating mode, main heating mode or main system Under chill formula.
To achieve the above object, another aspect of the present invention embodiment proposes a kind of multi-line system, including:Outdoor unit, The outdoor unit includes compressor;Multiple indoor units;Part flow arrangement, the part flow arrangement include First Heat Exchanger, the second heat exchange Device and heating restricting element, the outlet of the first heat exchange flow path of the First Heat Exchanger and the first heat exchange of second heat exchanger The entrance of flow path is connected, the outlet of the second heat exchange flow path of second heat exchanger and the second heat exchange of the First Heat Exchanger The entrance of flow path is connected, and the heating restricting element is arranged on outlet and the institute of the first heat exchange flow path of second heat exchanger Between the entrance of the second heat exchange flow path for stating the second heat exchanger;Control module, the control module are used to obtain the compressor The target exhaust pressure either corresponding saturation temperature of the target exhaust pressure and according to the target exhaust pressure or institute It states the corresponding saturation temperature of target exhaust pressure and the compressor stable operation is controlled such that the compressor, and in institute The current exhaust degree of superheat that the compressor is obtained after compressor stable operation is stated, the control module obtains the compressor The target exhaust degree of superheat, and judge whether the current exhaust degree of superheat is less than the target exhaust degree of superheat, wherein, if institute It states the current exhaust degree of superheat and is less than the target exhaust degree of superheat, then carrying out aperture to the heating restricting element turns control down, Until the difference between the high-pressure and middle pressure pressure of the part flow arrangement is less than the first preset value or receives heating chamber During the hydrops signal of interior machine, forbid turning down the aperture of the heating restricting element.
Multi-line system according to embodiments of the present invention, control module obtain first compressor target exhaust pressure or The corresponding saturation temperature of target exhaust pressure, and according to target exhaust pressure or the corresponding saturation temperature pair of target exhaust pressure Compressor is controlled such that compressor stable operation, and the current exhaust overheat of compressor is obtained after compressor stable operation Degree.Then, control module obtains the target exhaust degree of superheat of compressor, and judges whether the current exhaust degree of superheat is less than target and arranges The gas degree of superheat if the current exhaust degree of superheat is less than the target exhaust degree of superheat, carries out aperture to heating restricting element and turns control down System, until the difference between the high-pressure and middle pressure pressure of part flow arrangement is less than the first preset value or receives in heating chamber During the hydrops signal of machine, forbid turning down the aperture of heating restricting element, so as to ensure that system has the higher degree of superheat, make system Under heating, especially under sub-load heating, there is better performance and efficiency.
According to one embodiment of present invention, if the current exhaust degree of superheat is more than the target exhaust degree of superheat, The control module then carries out aperture to the heating restricting element and tunes up control.
According to one embodiment of present invention, after the aperture to the heating restricting element is adjusted, the control Module also judges whether the current exhaust degree of superheat is equal to the target exhaust degree of superheat, and judges the current of the compressor The corresponding saturation temperature of pressure at expulsion whether be more than or equal to the compressor the corresponding saturation temperature of target exhaust pressure and Judge whether the running frequency of the compressor is more than or equal to peak frequency, and be equal to the mesh in the current exhaust degree of superheat The corresponding saturation temperature of current exhaust pressure of mark discharge superheat or the compressor is more than or equal to the mesh of the compressor When marking the running frequency of the corresponding saturation temperature of pressure at expulsion or the compressor more than or equal to the peak frequency, control The aperture of the heating restricting element remains unchanged.
According to one embodiment of present invention, if the current exhaust degree of superheat is overheated not equal to the target exhaust The target exhaust pressure that degree, the corresponding saturation temperature of the current exhaust pressure of the compressor are less than the compressor is corresponding full It is less than the peak frequency with temperature and the running frequency of the compressor, the control module is then to the fortune of the compressor Line frequency is adjusted, and the aperture of the heating restricting element is adjusted according to the running frequency of the compressor after adjusting Section.
According to one embodiment of present invention, the multi-line system is operated in heating mode, main heating mode or main system Under chill formula.
Description of the drawings
Fig. 1 is the structure diagram of multi-line system according to an embodiment of the invention.
Fig. 2 is the flow chart for the control method that restricting element is heated in multi-line system according to embodiments of the present invention.
Fig. 3 is the flow for the control method that restricting element is heated in multi-line system according to an embodiment of the invention Figure.
Reference numeral:Outdoor unit 10, multiple indoor units 20, part flow arrangement 30, gas-liquid separator 31, First Heat Exchanger 32, Second heat exchanger 33, first throttle element 34 and heating restricting element 35.
Specific embodiment
The embodiment of the present invention is described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end Same or similar label represents same or similar element or has the function of same or like element.Below with reference to attached The embodiment of figure description is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
It describes the multi-line system that proposes according to embodiments of the present invention with reference to the accompanying drawings and its heats restricting element Control method.
In an embodiment of the present invention, multi-line system includes outdoor unit, part flow arrangement and multiple indoor units, outdoor unit bag Compressor is included, part flow arrangement includes First Heat Exchanger, the second heat exchanger and heating restricting element, the first heat exchange of First Heat Exchanger The outlet of flow path is connected with the entrance of the first heat exchange flow path of the second heat exchanger, and the second heat exchange flow path of the second heat exchanger goes out Mouth is connected with the entrance of the second heat exchange flow path of First Heat Exchanger, and heating restricting element is arranged on the first of the second heat exchanger and changes Between the entrance of the outlet of hot flowpath and the second heat exchange flow path of the second heat exchanger.
Specifically, as shown in Figure 1, multi-line system includes outdoor unit 10, multiple indoor units 20, part flow arrangement 30, wherein, Outdoor unit 10 includes compressor (not specifically illustrated in figure), and part flow arrangement 30 includes gas-liquid separator 31, First Heat Exchanger 32, the Two heat exchangers 33, first throttle element 34 and heating restricting element 35.
The first end of gas-liquid separator 31 is connected with one end of outdoor unit 10.The second end of gas-liquid separator 31 is changed with first The entrance of first heat exchange flow path of hot device 32 is connected, and first throttle element 34 is arranged on the first heat exchange stream of First Heat Exchanger 32 Between the entrance of the outlet on road and the first heat exchange flow path of the second heat exchanger 33.Heating restricting element 35 is arranged on the second heat exchanger Between the outlet of 33 the first heat exchange flow path and the entrance of the second of the second heat exchanger 33 the heat exchange flow path, the of the second heat exchanger 33 The outlet of two heat exchange flow paths is connected with the entrance of the second heat exchange flow path of First Heat Exchanger 32, and the second of First Heat Exchanger 32 changes The one end of the outlet of hot flowpath respectively with the other end of outdoor unit 10 and the indoor unit that freezes is connected.The other end of refrigeration indoor unit Outlet with the first heat exchange flow path of the second heat exchanger 33 is connected, the 3rd end of gas-liquid separator 31 and the one of heating indoor unit End is connected, and the entrance for heating the other end of indoor unit and the first heat exchange flow path of the second heat exchanger 33 is connected.Wherein, first Restricting element and heating restricting element can be electric expansion valve, and First Heat Exchanger and the second heat exchanger can be plate-type heat-exchange Device.
It (is run in multi-line system heating including multi-line system with heating mode, main heating mode or main refrigeration mode) When, especially under sub-load heating, if the aperture of heating restricting element is too small, the inlet and outlet for heating indoor unit will be caused Pressure difference (i.e. pressure difference value Δ P=Ps1-Ps2 between the high-pressure Ps1 of part flow arrangement and middle pressure pressure Ps2) becomes smaller, and enters Heat indoor unit refrigerant flow and flow velocity can all reduce, at this time due to heating indoor unit residing for indoor temperature usually compared with Low, liquid storage occurs for chance in heating chamber, and heating the leaving air temp of indoor unit will reduce, and decays so as to cause heating capacity, because This needs takes measures to heat extra liquid in indoor unit and exhausts.Meanwhile smaller inlet outlet pressure differential can not only cause system Hot indoor unit degree of supercooling is too big, and can cause degree of supercooling SCm2=Tps2-Tm2 (wherein, Tps2 before the valve of heating restricting element For the corresponding saturation temperature of upstream pressure value of the corresponding saturation temperature of middle pressure pressure value of part flow arrangement, i.e. heating restricting element Degree, Tm2 are temperature value before the valve for heating restricting element) it is higher.
And if the aperture of heating restricting element is too big, the inlet outlet pressure differential for causing to heat indoor unit is become larger, is entered The refrigerant flow and flow velocity for heating indoor unit can all increase, although liquid storage is less likely to occur heating indoor unit at this time, can lead The outlet subcooling for causing heating indoor unit is too small, and degree of supercooling SCm2 is too small before heating the valve of restricting element, it is possible to before there is valve There is gas, cause system unstable.Meanwhile the aperture for heating restricting element will also result in greatly very much the running frequency liter of compressor Height, system energy efficiency reduce, and high pressure is it is possible that rise not get on, the discharge superheat of compressor is sometimes than relatively low.
If under conditions of hydrops does not occur for heating indoor unit, it is smaller to heat the aperture of restricting element, compresses at this time The discharge superheat of machine can be higher, and high pressure is also higher, and for the running frequency of compressor than relatively low, system energy efficiency can be very high.But It allows for, if the aperture of heating restricting element is adjusted according only to the target exhaust degree of superheat of compressor, in some operating modes Under (such as under sub-load heating), the running frequency of compressor is than relatively low, the refrigerant flow very little of system, and compressor Discharge superheat is not also high, then will be so that heating at this time due to the discharge superheat miss the mark discharge superheat of compressor The aperture of restricting element continues to turn down, so that the hydrops of heating indoor unit is more serious.Since system resistance is big, compressor Pressure at expulsion it is big, the running frequency of compressor will not raise again, system work will be more abnormal, endless loop can be absorbed in. Therefore, can the target exhaust degree of superheat according to compressor by the aperture for heating restricting element turn down to a certain degree when, lead to The pressure pressure differential deltap P=Ps1-Ps2 that crosses between the high-pressure Ps1 for controlling rational part flow arrangement and middle pressure pressure Ps2 makes System can meet drain requirement and with heating well and efficiency performance.
Fig. 2 is the flow chart for the control method that restricting element is heated in multi-line system according to embodiments of the present invention.Such as Shown in Fig. 2, the control method that restricting element is heated in the multi-line system comprises the following steps:
S1 obtains the target exhaust pressure of compressor or the corresponding saturation temperature of target exhaust pressure.
S2 is controlled such that compressor according to target exhaust pressure or the corresponding saturation temperature of target exhaust pressure Compressor stable operation, and after compressor stable operation obtain compressor the current exhaust degree of superheat.
Specifically, when multi-line system is run with heating mode, main heating mode or main refrigeration mode, by being arranged on The pressure sensor of the exhaust ports of compressor obtains the pressure at expulsion Pc of compressor or is getting the row of compressor in real time After atmospheric pressure Pc, the corresponding saturation temperature Tc of pressure at expulsion is obtained according to pressure at expulsion Pc.Then, according to the exhaust pressure of compressor Power Pc (the either corresponding saturation temperature Tc of pressure at expulsion) and target exhaust pressure Pcs (or target exhaust pressure is corresponding full And temperature Tcs) between difference PI (Proportional Integral, proportional integration) is carried out to the running frequency of compressor It adjusts, after compressor stable operation, to obtain the pressure at expulsion Pc of new compressor (or the corresponding saturation temperature of pressure at expulsion Spend Tc), the high-pressure Ps1 and middle pressure pressure Ps2 of the discharge superheat DSH of compressor and part flow arrangement.Wherein, high pressure Pressure Ps1 can be detected by the pressure sensor in the exit of the first heat exchange flow path of the First Heat Exchanger for being arranged on part flow arrangement It obtains, middle pressure pressure Ps2 can be detected by the pressure sensor of the inlet for the first heat exchange flow path for being arranged on the second heat exchanger It obtains.
S3, obtains the target exhaust degree of superheat of compressor, and judges whether the current exhaust degree of superheat is less than target exhaust mistake Temperature.
S4 if the current exhaust degree of superheat is less than the target exhaust degree of superheat, carries out aperture to heating restricting element and turns down Control, until the difference between the high-pressure and middle pressure pressure of part flow arrangement is less than the first preset value or receives heating chamber During the hydrops signal of interior machine, forbid turning down the aperture of heating restricting element.
According to one embodiment of present invention, if the current exhaust degree of superheat is more than the target exhaust degree of superheat, to heating Restricting element carries out aperture and tunes up control.
Specifically, controlled compressor to obtain pressure at expulsion Pc (or the pressures at expulsion of new compressor Corresponding saturation temperature Tc), on the premise of the discharge superheat DSH of compressor and high-pressure Ps1 and middle pressure pressure Ps2, Restricting element is heated from current aperture, PI tune is carried out according to the discharge superheat DSH of compressor and target exhaust degree of superheat DSHm Section.If DSH < DSHm, control heating restricting element aperture turn down, at this time compressor pressure at expulsion Pc (or exhaust The corresponding saturation temperature Tc of pressure) rise, the discharge superheat DSH of compressor rises.
But in order to ensure that the minimum flow for heating restricting element will not make heating indoor unit that hydrops occur, it is necessary to every When once turning down the aperture of heating restricting element, the difference between the high-pressure Ps1 of part flow arrangement and middle pressure pressure Ps2 is judged Whether Δ P is less than the first preset value A, and (it is that in system, hydrops shunting does not fill by experimental verification acquisition that the value, which is generally, Smaller pressure difference value between the high-pressure and middle pressure pressure put) or judge whether to receive the hydrops for heating indoor unit Signal.If Δ P < A or heating indoor unit receive hydrops signal, then it is assumed that cannot continue to turn down heating restricting element Aperture, it should in the case where ensureing to have discharge superheat, even if discharge superheat miss the mark discharge superheat, it is also desirable to Stop continuing the aperture for turning down heating restricting element;If Δ P > A, aperture is carried out to heating restricting element and tunes up control, this When compressor pressure at expulsion Pc (or the corresponding saturation temperature Tc of pressure at expulsion) decline, the discharge superheat DSH of compressor Decline.
According to one embodiment of present invention, after the aperture to heating restricting element is adjusted, further include:Judge to work as Whether the front exhaust degree of superheat is equal to the target exhaust degree of superheat, and judges that the corresponding saturation temperature of current exhaust pressure of compressor is The no corresponding saturation temperature of target exhaust pressure more than or equal to compressor and judge whether the running frequency of compressor is more than Equal to peak frequency;If the current exhaust degree of superheat is equal to the current exhaust pressure pair of the target exhaust degree of superheat or compressor The saturation temperature answered is big more than or equal to the corresponding saturation temperature of target exhaust pressure of compressor or the running frequency of compressor In equal to peak frequency, then the aperture of heating restricting element is controlled to remain unchanged.
If the current exhaust degree of superheat is not equal to the target exhaust degree of superheat, the corresponding saturation of the current exhaust pressure of compressor Temperature is less than the corresponding saturation temperature of target exhaust pressure of compressor and the running frequency of compressor is less than peak frequency, then The running frequency of compressor is adjusted, and according to the running frequency of the compressor after adjusting to heating the aperture of restricting element It is adjusted.
Specifically, after the aperture to heating restricting element is adjusted, DSH=DSHm has been further determined whether, and Pc >= Pcs (either Tc >=Tcs) or compressor have expired frequency.If DSH=DSHm either DSH ≠ DSHm but Pc >=Pcs (or Tc >=Tcs) or DSH ≠ DSHm but compressor expired frequency, then the aperture of heating restricting element is controlled to remain unchanged;Otherwise, The running frequency of compressor is first adjusted, and readjusts the aperture of heating restricting element, until meeting above-mentioned condition, shows system Stable state is had reached, heating the aperture of restricting element can stablize under the aperture.When effectively preventing system heating, It is higher in order to obtain during the aperture for heating restricting element is adjusted according to the target exhaust degree of superheat of compressor Discharge superheat and excessively turn down heating restricting element aperture, cause system heating indoor unit occur hydrops, system high pressure Height, the running frequency of compressor is relatively low and not raising frequency, the discharge superheat of compressor can not raise and into the problem of endless loop, So as to ensure system under heating, especially under sub-load heating, the performance and efficiency of system can reach more preferable.
For those skilled in the art is made to more clearly understand the present invention, Fig. 3 is the more of specific example according to the present invention The flow chart of the control method of restricting element is heated in on-line system.
As shown in figure 3, the control method of restricting element is heated in multi-line system may include following steps:
S101 heats the current aperture of restricting element.
S102, the running frequency of compressor is according to the pressure at expulsion Pc of compressor (or the corresponding saturation temperature of pressure at expulsion Tc) difference between target exhaust pressure Pcs (or target exhaust pressure corresponding saturation temperature Tcs) carries out PI adjustings, with Obtain new pressure at expulsion Pc (or the corresponding saturation temperature Tc of pressure at expulsion), discharge superheat DSH, the part flow arrangement of compressor High-pressure Ps1 and middle pressure pressure Ps2.
S103 heats section according to the relation pair between the discharge superheat DSH of compressor and target exhaust degree of superheat DSHm The aperture of fluid element carries out PI adjustings.
S104 if DSH < DSHm, gradually turns down the aperture of heating restricting element.
S105 if DSH > DSHm, gradually opens the aperture of big heating restricting element.
S106 when as Δ P < A or receiving the hydrops signal of heating indoor unit, performs step S107.
S107 forbids continuing the aperture for turning down heating restricting element, prevents heating indoor unit hydrops.
S108 judges whether to meet DSH=DSHm, and Pc >=Pcs (or Tc >=Tcs) or compressor have expired frequency.If It is to perform step S109;If not, return to step S101.
S10,9, heating restricting element stabilization is stablized in the aperture, system.
In conclusion heating the control method of restricting element in multi-line system according to embodiments of the present invention, obtain first Take the target exhaust pressure of the compressor either corresponding saturation temperature of target exhaust pressure and according to target exhaust pressure or mesh The corresponding saturation temperature of mark pressure at expulsion is controlled such that compressor compressor stable operation, and in compressor stable operation The current exhaust degree of superheat of compressor is obtained afterwards.Then, the target exhaust degree of superheat of compressor is obtained, and judges current exhaust mistake Whether temperature is less than the target exhaust degree of superheat, if the current exhaust degree of superheat is less than the target exhaust degree of superheat, throttles to heating Element carries out aperture and turns control down, until the difference between the high-pressure and middle pressure pressure of part flow arrangement is less than the first preset value Or when receiving the hydrops signal of heating indoor unit, forbid turning down the aperture of heating restricting element, so as to ensure that system has The higher degree of superheat makes system under heating, especially under sub-load heating, has better performance and efficiency.
Fig. 1 is the structure diagram of multi-line system according to an embodiment of the invention.As shown in Figure 1, multi-connected machine system System includes outdoor unit 10, multiple indoor units 20, part flow arrangement 30 and control module (not specifically illustrated in figure).
Wherein, outdoor unit 10 includes compressor (not specifically illustrated in figure).Part flow arrangement 30 includes First Heat Exchanger 32, the Two heat exchangers 33 and heating restricting element 35, the of the outlet of the first heat exchange flow path of First Heat Exchanger 32 and the second heat exchanger 33 The entrance of one heat exchange flow path is connected, and the outlet of the second heat exchange flow path of the second heat exchanger 33 is changed with the second of First Heat Exchanger 32 The entrance of hot flowpath is connected, and heating restricting element 35 is arranged on the outlet and second of the first heat exchange flow path of the second heat exchanger 33 Between the entrance of second heat exchange flow path of heat exchanger 33.
Control module is used to obtain the target exhaust pressure of compressor or the corresponding saturation temperature of target exhaust pressure, and It is controlled such that compressor is stablized to compressor according to target exhaust pressure or the corresponding saturation temperature of target exhaust pressure It runs, and the current exhaust degree of superheat of compressor is obtained after compressor stable operation, control module obtains the target of compressor Discharge superheat, and judge whether the current exhaust degree of superheat is less than the target exhaust degree of superheat, if the current exhaust degree of superheat is less than The target exhaust degree of superheat, then to heating restricting element 35 carry out aperture turn control down, until part flow arrangement 30 high-pressure and When difference between middle pressure pressure is less than the first preset value or receives the hydrops signal of heating indoor unit, forbid turning down heating The aperture of restricting element 35.
According to one embodiment of present invention, if the current exhaust degree of superheat is more than the target exhaust degree of superheat, control module Aperture then is carried out to heating restricting element 35 and tunes up control.
Specifically, at multi-line system heating (including being run with heating mode, main heating mode or main refrigeration mode), Control module by be arranged on the pressure sensor of the exhaust ports of compressor obtain in real time compressor pressure at expulsion Pc or After the pressure at expulsion Pc of compressor is got, the corresponding saturation temperature Tc of pressure at expulsion is obtained according to pressure at expulsion Pc.Then, Control module is according to the pressure at expulsion Pc (or the corresponding saturation temperature Tc of pressure at expulsion) and target exhaust pressure Pcs of compressor Difference between (or the corresponding saturation temperature Tcs of target exhaust pressure) carries out PI adjustings to the running frequency of compressor, with After compressor stable operation, obtain new compressor pressure at expulsion Pc (or the corresponding saturation temperature Tc of pressure at expulsion), The discharge superheat DSH of the compressor and high-pressure Ps1 of part flow arrangement and middle pressure pressure Ps2.Wherein, high-pressure Ps1 It can be detected and obtained by the pressure sensor in the exit of the first heat exchange flow path of the First Heat Exchanger for being arranged on part flow arrangement, in Pressure pressure Ps2 can be detected by the pressure sensor of the inlet for the first heat exchange flow path for being arranged on the second heat exchanger and obtained.
Control module is controlling compressor to obtain the pressure at expulsion Pc of new compressor (or pressures at expulsion pair The saturation temperature Tc answered), on the premise of the discharge superheat DSH of compressor and high-pressure Ps1 and middle pressure pressure Ps2, control Molding root tuber is according to the discharge superheat DSH of compressor and target exhaust degree of superheat DSHm, to heating restricting element from current aperture Carry out PI adjustings.If DSH < DSHm, control module if, controls the aperture of heating restricting element to turn down, at this time the row of compressor Atmospheric pressure Pc (or the corresponding saturation temperature Tc of pressure at expulsion) rises, and the discharge superheat DSH of compressor rises.
But in order to ensure that the minimum flow for heating restricting element will not make heating indoor unit that hydrops occur, it is necessary to control Module turn down each time heating restricting element aperture when, judge part flow arrangement high-pressure Ps1 and middle pressure pressure Ps2 it Between difference DELTA P whether be less than the first preset value A (value be generally be by experimental verification obtain in system not hydrops situation Smaller pressure difference value between the high-pressure and middle pressure pressure of lower part flow arrangement) or judge whether to receive in heating chamber The hydrops signal of machine.If Δ P < A or heating indoor unit receive hydrops signal, then it is assumed that cannot continue to turn down heating section The aperture of fluid element, it should in the case where ensureing to have discharge superheat, even if discharge superheat miss the mark discharge superheat Degree, it is also desirable to stop continuing the aperture for turning down heating restricting element;If Δ P > A, if control module to heating restricting element into Row aperture tunes up control, and the pressure at expulsion Pc (or the corresponding saturation temperature Tc of pressure at expulsion) of compressor declines at this time, compression The discharge superheat DSH of machine declines.
According to one embodiment of present invention, after the aperture to heating restricting element 35 is adjusted, control module is also Judge whether the current exhaust degree of superheat is equal to the target exhaust degree of superheat, and judge the corresponding saturation of current exhaust pressure of compressor Whether temperature is more than or equal to the corresponding saturation temperature of target exhaust pressure of compressor and judges that the running frequency of compressor is It is no to be more than or equal to peak frequency, and it is equal to the current exhaust of the target exhaust degree of superheat or compressor in the current exhaust degree of superheat The corresponding saturation temperature of pressure is more than or equal to the corresponding saturation temperature of target exhaust pressure of compressor or the operation of compressor When frequency is more than or equal to peak frequency, the aperture of control heating restricting element 35 remains unchanged.
If the current exhaust degree of superheat is not equal to the target exhaust degree of superheat, the corresponding saturation of the current exhaust pressure of compressor Temperature is less than the corresponding saturation temperature of target exhaust pressure of compressor and the running frequency of compressor is less than peak frequency, control Molding block is then adjusted the running frequency of compressor, and first to heating throttling according to the running frequency of the compressor after adjusting The aperture of part 35 is adjusted.
Specifically, after the aperture to heating restricting element 35 is adjusted, control module has further determined whether DSH= DSHm, and Pc >=Pcs (either Tc >=Tcs) or compressor have expired frequency.If DSH=DSHm or DSH ≠ DSHm but Pc >=Pcs (either Tc >=Tcs) or DSH ≠ DSHm but compressor have expired frequency, and control module then controls heating restricting element 35 Aperture remain unchanged;Otherwise, the running frequency of compressor is first adjusted, and readjusts the aperture of heating restricting element 35, directly To above-mentioned condition is met, show that system has reached stable state, the aperture of heating restricting element 35 can be stablized in the aperture Under.When effectively preventing system heating, the aperture for heating restricting element is carried out in the target exhaust degree of superheat according to compressor During adjusting, in order to obtain higher discharge superheat and excessively turn down heating restricting element aperture, cause system It heats indoor unit and hydrops occurs, system high pressure is high, and the running frequency of compressor is relatively low and not raising frequency, the discharge superheat of compressor The problem of can not raising and entering endless loop, so as to ensure system under heating, especially under sub-load heating, the property of system It can reach more preferable with efficiency.
Multi-line system according to embodiments of the present invention, control module obtain first compressor target exhaust pressure or The corresponding saturation temperature of target exhaust pressure, and according to target exhaust pressure or the corresponding saturation temperature pair of target exhaust pressure Compressor is controlled such that compressor stable operation, and the current exhaust overheat of compressor is obtained after compressor stable operation Degree.Then, control module obtains the target exhaust degree of superheat of compressor, and judges whether the current exhaust degree of superheat is less than target and arranges The gas degree of superheat if the current exhaust degree of superheat is less than the target exhaust degree of superheat, carries out aperture to heating restricting element and turns control down System, until the difference between the high-pressure and middle pressure pressure of part flow arrangement is less than the first preset value or receives in heating chamber During the hydrops signal of machine, forbid turning down the aperture of heating restricting element, so as to ensure that system has the higher degree of superheat, make system Under heating, especially under sub-load heating, there is better performance and efficiency.
In the description of the present invention, it is to be understood that term " first ", " second " are only used for description purpose, and cannot It is interpreted as indicating or implies relative importance or imply the quantity of the technical characteristic indicated by indicating.Define as a result, " the One ", at least one this feature can be expressed or be implicitly included to the feature of " second ".In the description of the present invention, " multiple " It is meant that at least two, such as two, three etc., unless otherwise specifically defined.
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc. Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral;Can be that machinery connects It connects or is electrically connected;It can be directly connected, can also be indirectly connected by intermediary, can be in two elements The connection in portion or the interaction relationship of two elements, unless otherwise restricted clearly.For those of ordinary skill in the art For, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms is not It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office It is combined in an appropriate manner in one or more embodiments or example.In addition, without conflicting with each other, the skill of this field Art personnel can tie the different embodiments described in this specification or example and different embodiments or exemplary feature It closes and combines.Although the embodiment of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned Embodiment is changed, changes, replacing and modification.

Claims (10)

1. the control method of restricting element is heated in a kind of multi-line system, which is characterized in that the multi-line system includes room Outer machine, part flow arrangement and multiple indoor units, the outdoor unit include compressor, and the part flow arrangement includes First Heat Exchanger, the Two heat exchangers and heating restricting element, the outlet and the of second heat exchanger of the first heat exchange flow path of the First Heat Exchanger The entrance of one heat exchange flow path is connected, the outlet and the of the First Heat Exchanger of the second heat exchange flow path of second heat exchanger The entrance of two heat exchange flow paths is connected, and the heating restricting element is arranged on going out for the first heat exchange flow path of second heat exchanger Between the entrance of second heat exchange flow path of mouth and second heat exchanger, it the described method comprises the following steps:
Obtain the target exhaust pressure of the compressor or the corresponding saturation temperature of the target exhaust pressure;
The compressor is controlled according to the target exhaust pressure or the target exhaust pressure corresponding saturation temperature It makes so that the compressor stable operation, and the current exhaust overheat of the compressor is obtained after the compressor stable operation Degree;
The target exhaust degree of superheat of the compressor is obtained, and judges whether the current exhaust degree of superheat is less than the target and arranges The gas degree of superheat;And
If the current exhaust degree of superheat is less than the target exhaust degree of superheat, aperture is carried out to the heating restricting element Control is turned down, until the difference between the high-pressure and middle pressure pressure of the part flow arrangement is less than the first preset value or reception During to the hydrops signal for heating indoor unit, forbid turning down the aperture of the heating restricting element.
2. the control method of restricting element is heated in multi-line system according to claim 1, which is characterized in that if institute The current exhaust degree of superheat is stated more than the target exhaust degree of superheat, then aperture is carried out to the heating restricting element and tunes up control.
3. the control method of restricting element is heated in multi-line system according to claim 1 or 2, which is characterized in that After the aperture of the heating restricting element is adjusted, further include:
Judge whether the current exhaust degree of superheat is equal to the target exhaust degree of superheat, and judge that working as the compressor is front-seat Whether the corresponding saturation temperature of atmospheric pressure is more than or equal to the corresponding saturation temperature of target exhaust pressure of the compressor and sentences Whether the running frequency of the disconnected compressor is more than or equal to peak frequency;
If the current exhaust degree of superheat is equal to the current exhaust pressure of the target exhaust degree of superheat or the compressor Corresponding saturation temperature is more than or equal to the target exhaust pressure corresponding saturation temperature of the compressor or the compressor Running frequency is more than or equal to the peak frequency, then the aperture of the heating restricting element is controlled to remain unchanged.
4. the control method of restricting element is heated in multi-line system according to claim 3, which is characterized in that if institute The current exhaust degree of superheat is stated not equal to the target exhaust degree of superheat, the corresponding saturation temperature of the current exhaust pressure of the compressor Degree less than the corresponding saturation temperature of target exhaust pressure of the compressor and the running frequency of the compressor be less than it is described most Big frequency is then adjusted the running frequency of the compressor, and according to the running frequency of the compressor after adjusting to described The aperture of heating restricting element is adjusted.
5. the control method of restricting element is heated in multi-line system according to claim 1, which is characterized in that described more On-line system is operated under heating mode, main heating mode or main refrigeration mode.
6. a kind of multi-line system, which is characterized in that including:
Outdoor unit, the outdoor unit include compressor;
Multiple indoor units;
Part flow arrangement, the part flow arrangement include First Heat Exchanger, the second heat exchanger and heating restricting element, first heat exchange The outlet of first heat exchange flow path of device is connected with the entrance of the first heat exchange flow path of second heat exchanger, second heat exchange The outlet of second heat exchange flow path of device is connected with the entrance of the second heat exchange flow path of the First Heat Exchanger, the heating throttling Element is arranged on exporting and the second heat exchange flow path of second heat exchanger for the first heat exchange flow path of second heat exchanger Between entrance;
Control module, the control module are used to obtain the target exhaust pressure of the compressor or the target exhaust pressure Corresponding saturation temperature, and according to the target exhaust pressure or the corresponding saturation temperature of the target exhaust pressure to described Compressor is controlled such that the compressor stable operation, and obtains the compressor after the compressor stable operation The current exhaust degree of superheat, the control module obtain the target exhaust degree of superheat of the compressor, and judge the current exhaust Whether the degree of superheat is less than the target exhaust degree of superheat, wherein, if the current exhaust degree of superheat is less than the target exhaust The degree of superheat then carries out aperture to the heating restricting element and turns control down, until the high-pressure of the part flow arrangement and middle pressure When difference between pressure is less than the first preset value or receives the hydrops signal of heating indoor unit, forbid turning down the heating The aperture of restricting element.
7. multi-line system according to claim 6, which is characterized in that if the current exhaust degree of superheat is more than described The target exhaust degree of superheat, the control module then carry out aperture to the heating restricting element and tune up control.
8. the multi-line system according to claim 6 or 7, which is characterized in that in the aperture to the heating restricting element After being adjusted, the control module also judges whether the current exhaust degree of superheat is equal to the target exhaust degree of superheat, and Judge whether the corresponding saturation temperature of current exhaust pressure of the compressor is more than or equal to the target exhaust pressure of the compressor The corresponding saturation temperature of power and judge the compressor running frequency whether be more than or equal to peak frequency, and it is described work as The front exhaust degree of superheat is equal to the target exhaust degree of superheat or the corresponding saturation temperature of current exhaust pressure of the compressor Be more than more than or equal to the corresponding saturation temperature of target exhaust pressure of the compressor or the running frequency of the compressor etc. When the peak frequency, the aperture of the heating restricting element is controlled to remain unchanged.
9. multi-line system according to claim 8, which is characterized in that if the current exhaust degree of superheat is not equal to institute State the target exhaust degree of superheat, the corresponding saturation temperature of the current exhaust pressure of the compressor is arranged less than the target of the compressor The corresponding saturation temperature of atmospheric pressure and the running frequency of the compressor are less than the peak frequency, and the control module is then right The running frequency of the compressor is adjusted, and according to the running frequency of the compressor after adjusting to the heating restricting element Aperture be adjusted.
10. the control method of restricting element is heated in multi-line system according to claim 6, which is characterized in that described Multi-line system is operated under heating mode, main heating mode or main refrigeration mode.
CN201610348574.7A 2016-05-23 2016-05-23 Multi-line system and its control method for heating restricting element Active CN105928266B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610348574.7A CN105928266B (en) 2016-05-23 2016-05-23 Multi-line system and its control method for heating restricting element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610348574.7A CN105928266B (en) 2016-05-23 2016-05-23 Multi-line system and its control method for heating restricting element

Publications (2)

Publication Number Publication Date
CN105928266A CN105928266A (en) 2016-09-07
CN105928266B true CN105928266B (en) 2018-06-05

Family

ID=56842112

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610348574.7A Active CN105928266B (en) 2016-05-23 2016-05-23 Multi-line system and its control method for heating restricting element

Country Status (1)

Country Link
CN (1) CN105928266B (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106766326B (en) * 2016-11-24 2019-04-30 广东美的暖通设备有限公司 Multi-line system and its refrigeration in press restricting element control method
CN107120786B (en) * 2017-04-12 2019-11-05 广东美的暖通设备有限公司 The control method and device of interior machine restricting element in air conditioner and air conditioner
CN107144054B (en) * 2017-04-14 2019-04-16 珠海格力电器股份有限公司 The aperture control method and device of electric expansion valve
CN107449191B (en) * 2017-07-20 2019-11-15 广东美的暖通设备有限公司 Air-conditioning system and its heat-production control method, device and machine readable storage medium
CN107631431A (en) * 2017-09-25 2018-01-26 珠海格力电器股份有限公司 Air conditioning control method and device
CN107940827B (en) * 2017-11-10 2020-04-10 广东美的暖通设备有限公司 Multi-split air conditioning system and refrigerant distribution control method and device thereof
CN108278713B (en) * 2018-01-19 2021-04-09 珠海格力电器股份有限公司 Pressure control method and device
CN111780370A (en) * 2020-07-03 2020-10-16 海信(山东)空调有限公司 Air conditioner and control method of electronic expansion valve

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4996184B2 (en) * 2006-09-19 2012-08-08 東京エレクトロン株式会社 Wafer temperature control apparatus and wafer temperature control method
JP5003829B2 (en) * 2011-01-19 2012-08-15 ダイキン工業株式会社 Air conditioner
CN102368009B (en) * 2011-11-09 2014-01-22 宁波奥克斯电气有限公司 Control method of electronic expansion valve of indoor machine during refrigerating of convertible frequency air conditioner
CN202885329U (en) * 2012-07-09 2013-04-17 广东美的电器股份有限公司 Air-conditioning system
CN103411360B (en) * 2013-08-28 2016-03-02 丹佛斯公司 Refrigeration system and method
CN104976813B (en) * 2014-04-04 2017-07-28 广东美的暖通设备有限公司 Air conditioner
CN105588385A (en) * 2014-12-16 2016-05-18 青岛海信日立空调系统有限公司 Outdoor unit, air conditioning system and control method
CN105202837A (en) * 2015-10-19 2015-12-30 广东美的暖通设备有限公司 Multi-split air conditioning system and intermediate pressure control method thereof

Also Published As

Publication number Publication date
CN105928266A (en) 2016-09-07

Similar Documents

Publication Publication Date Title
CN105928266B (en) Multi-line system and its control method for heating restricting element
CN106016457B (en) Multi-line system and its control method for heating restricting element
CN105928059B (en) Multi-line system and its control method for heating restricting element
CN105066539B (en) Multi-line system and its control method for electronic expansion valve
CN105972860B (en) Multi-line system and its valve body control method for crossing cold loop
CN106352473B (en) Multi-line system and its fault detection method that branch valve component is subcooled
EP2224191B1 (en) Air conditioner and method of controlling the same
CN106152633B (en) Multi-line system and its control method
CN105953468B (en) Multi-line system and its valve body control method for crossing cold loop
CN108105912B (en) Multi-line system and its anti-refrigerant bias current control method, control device
US7451615B2 (en) Refrigeration device
CN107559955B (en) Multi-line system and its low temperature control method
CN106352445B (en) Multi-line system and its control method
CN107120786B (en) The control method and device of interior machine restricting element in air conditioner and air conditioner
CN106123227B (en) Multi-line system and its control method
CN108139118A (en) Refrigerating circulatory device
CN107401849A (en) Multiple on-line system and its control method and device that loop valve body is subcooled
CN107490090B (en) Air conditioner
CN108036551A (en) Switching device and there is its multi-gang air-conditioner
WO2012042692A1 (en) Refrigeration cycle device
CN107560215B (en) Multi-line system and its control method and device that circuit valve body is subcooled
CN107559953A (en) Multiple on-line system and its control method and device that loop valve body is subcooled
CN108131803A (en) The control method of multi-gang air-conditioner
CN106403044B (en) The determination method of multi-line system and its indoor unit heating capacity
CN105202837A (en) Multi-split air conditioning system and intermediate pressure control method thereof

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant