CN106016457B - 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 PDFInfo
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- CN106016457B CN106016457B CN201610351236.9A CN201610351236A CN106016457B CN 106016457 B CN106016457 B CN 106016457B CN 201610351236 A CN201610351236 A CN 201610351236A CN 106016457 B CN106016457 B CN 106016457B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
-
- 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
- F25B40/00—Subcoolers, desuperheaters or superheaters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
-
- 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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating 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
- 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
- F25B2400/23—Separators
-
- 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
- F25B2600/2509—Economiser valves
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Signal Processing (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
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: obtaining the target exhaust pressure or the corresponding saturation temperature of target exhaust pressure of compressor；Compressor stable operation is controlled such that compressor according to target exhaust pressure or target exhaust pressure corresponding saturation temperature, and the high-pressure and middle pressure pressure of part flow arrangement are obtained after compressor stable operation, and calculate the pressure difference value between high-pressure and middle pressure pressure；And the goal pressure difference between the high-pressure and middle pressure pressure of acquisition part flow arrangement, and the aperture of heating restricting element is adjusted according to pressure difference value and goal pressure difference.The aperture of pressure difference value adjustment heating restricting element between the high pressure that this method passes through part flow arrangement, so that multi-line system in heating, when especially sub-load heats, had not only been able to satisfy drain requirement, but also have good performance and efficiency.
Description
Technical field
The present invention relates to air-conditioning technical field, in particular to the control method of restricting element is heated in a kind of multi-line system
And a kind of multi-line system.
Background technique
Multi-line system has pure refrigeration, pure heating, main refrigeration and four kinds of modes of main heating.Wherein, main refrigeration mode and
Main heating mode can utilize the condensation heat and heat of evaporation of system simultaneously, realize while freezing and heating, 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 will affect 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 refrigerant flow with higher simultaneously and also have higher condensation temperature, to export higher heating capacity.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose to heat the control method of restricting element in a kind of multi-line system, by the high pressure of part flow arrangement it
Between pressure difference value adjustment heating restricting element aperture so that multi-line system heating when, especially sub-load heat
When, it was not only able to satisfy drain requirement, but also there is good performance and efficiency, and had improved user experience.
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, the multi-line system include outdoor unit, part flow arrangement and multiple indoor units, and the outdoor unit includes compressor,
The part flow arrangement includes First Heat Exchanger, the second heat exchanger and heating restricting element, the first heat exchange of the First Heat Exchanger
The outlet of flow path is connected with the entrance of the first heat exchange flow path of second heat exchanger, the second heat exchange of second heat exchanger
The outlet of flow path is connected with the entrance of the second heat exchange flow path of the First Heat Exchanger, and the heating restricting element is arranged in institute
It states between the outlet of the first heat exchange flow path of the second heat exchanger and the entrance of the second heat exchange flow path of second heat exchanger, it is described
Method is the following steps are included: obtain the target exhaust pressure or the corresponding saturation temperature of the target exhaust pressure of the compressor
Degree；The compressor is controlled according to the target exhaust pressure or the target exhaust pressure corresponding saturation temperature
So that the compressor stable operation, and the high-pressure of the part flow arrangement is obtained in after the compressor stable operation
Pressure pressure, and calculate the pressure difference value between the high-pressure and medium pressure pressure；And obtain the part flow arrangement
High-pressure and middle pressure pressure between goal pressure difference, and according to the pressure difference value and the goal pressure difference pair
The aperture of the heating restricting element is adjusted.
The control method that restricting element is heated in multi-line system according to an embodiment of the present invention, obtains compressor first
Target exhaust pressure perhaps the corresponding saturation temperature of target exhaust pressure then according to target exhaust pressure or target exhaust pressure
The corresponding saturation temperature of power is controlled such that compressor stable operation to compressor, and obtains and divide after compressor stable operation
The high-pressure and middle pressure pressure of device are flowed, and calculates the pressure difference value between high-pressure and middle pressure pressure, is finally obtained
Goal pressure difference between the high-pressure of part flow arrangement and middle pressure pressure, and according to pressure difference value and goal pressure difference pair
Heating restricting element aperture be adjusted so that multi-line system heating when, especially sub-load heat when, Ji Nengman
Sufficient drain requirement, and can have good performance and efficiency, improve user experience.
According to one embodiment of present invention, the heating is saved according to the pressure difference value and the goal pressure difference
The aperture of fluid element is adjusted, comprising: if the pressure difference value is greater than the goal pressure difference, saves to the heating
The aperture of fluid element carries out turning control down；If the pressure difference value is less than the goal pressure difference, the heating is saved
The aperture of fluid element carries out tuning up control.
According to one embodiment of present invention, after the aperture to the heating restricting element is adjusted, further includes: sentence
Whether the pressure difference value that breaks is equal to the goal pressure difference, and judges that the current exhaust pressure of the compressor is corresponding full
Whether it is more than or equal to the corresponding saturation temperature of the target exhaust pressure of the compressor with temperature, and judges the compressor
Whether running frequency is more than or equal to maximum frequency；If the pressure difference value is equal to the goal pressure difference or the pressure
The corresponding saturation temperature of the current exhaust pressure of contracting machine is more than or equal to the corresponding saturation temperature of target exhaust pressure of the compressor
The running frequency of degree or the compressor is more than or equal to the maximum frequency, then controls the aperture of the heating restricting element
It remains unchanged.
According to one embodiment of present invention, if the pressure difference value is not equal to the goal pressure difference, the pressure
The corresponding saturation temperature of the current exhaust pressure of contracting machine be less than the compressor the corresponding saturation temperature of target exhaust pressure and
The running frequency of the compressor is less than the maximum frequency, then the running frequency of the compressor is adjusted, and according to
The aperture of the heating restricting element is adjusted in the running frequency of compressor after adjusting.
According to one embodiment of present invention, the multi-line system work is in heating mode, main heating mode or main system
Under cold mode.
To achieve the above object, another aspect of the present invention embodiment proposes a kind of multi-line system, comprising: 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 and the first heat exchange of second heat exchanger of the first heat exchange flow path of the First Heat Exchanger
The entrance of flow path is connected, the outlet and the second heat exchange of the First Heat Exchanger of the second heat exchange flow path of second heat exchanger
The entrance of flow path is connected, and outlet and the institute of the first heat exchange flow path of second heat exchanger is arranged in the heating restricting element
It states between the entrance of the second heat exchange flow path of the second heat exchanger；Control module, the control module is for obtaining the compressor
The target exhaust pressure perhaps corresponding saturation temperature of the target exhaust pressure and according to the target exhaust pressure or institute
It states target exhaust pressure corresponding saturation temperature and the compressor stable operation is controlled such that the compressor, and in institute
The high-pressure and middle pressure pressure that the part flow arrangement is obtained after compressor stable operation are stated, the control module calculates the height
Pressure difference value between pressure pressure and medium pressure pressure, and obtain between the high-pressure of the part flow arrangement and middle pressure pressure
Goal pressure difference, and according to the pressure difference value and the goal pressure difference to the aperture of the heating restricting element
It is adjusted.
Multi-line system according to an embodiment 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 after compressor stable operation obtain part flow arrangement high-pressure and
Middle pressure pressure, then, control module calculate the pressure difference value between high-pressure and middle pressure pressure, and obtain the height of part flow arrangement
Goal pressure difference between pressure pressure and middle pressure pressure, and according to pressure difference value and goal pressure difference to heating throttling member
The aperture of part is adjusted, so that multi-line system in heating, when especially sub-load heats, had both been able to satisfy drain and has wanted
It asks, and can have good performance and efficiency.
According to one embodiment of present invention, the control module is according to the pressure difference value and the goal pressure difference
When the aperture of the heating restricting element is adjusted, wherein if the pressure difference value is greater than the goal pressure difference,
The control module then carries out turning control down to the aperture of the heating restricting element；If the pressure difference value is less than the mesh
Pressure difference value is marked, the control module then carries out tuning up control to the aperture of the heating restricting element.
According to one embodiment of present invention, the control module is adjusted in the aperture to the heating restricting element
Afterwards, also judge whether the pressure difference value is equal to the goal pressure difference, and judge the current exhaust of the compressor
Whether the corresponding saturation temperature of pressure is more than or equal to the corresponding saturation temperature of target exhaust pressure of the compressor, and judgement
Whether the running frequency of the compressor is more than or equal to maximum frequency, and is equal to the target pressure difference in the pressure difference value
Value or the corresponding saturation temperature of current exhaust pressure of the compressor are more than or equal to the target exhaust pressure of the compressor
When corresponding saturation temperature or the running frequency of the compressor are more than or equal to the maximum frequency, the heating section is controlled
The aperture of fluid element remains unchanged.
According to one embodiment of present invention, if the pressure difference value is not equal to the goal pressure difference, the pressure
The corresponding saturation temperature of the current exhaust pressure of contracting machine be less than the compressor the corresponding saturation temperature of target exhaust pressure and
The running frequency of the compressor is less than the maximum frequency, and the control module then carries out the running frequency of the compressor
It adjusts, and is adjusted according to aperture of the running frequency of the compressor after adjusting to the heating restricting element.
According to one embodiment of present invention, the multi-line system work is in heating mode, main heating mode or main system
Under cold mode.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of multi-line system according to an embodiment of the invention.
Fig. 2 is the flow chart that the control method of restricting element is heated in multi-line system according to an embodiment of the present invention.
Fig. 3 is the process that the control method of restricting element is heated in multi-line system according to an embodiment of the invention
Figure.
Appended drawing reference: 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, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain 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 packet
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 in the first of the second heat exchanger and changes
Between the entrance of second heat exchange flow path of the outlet and the second heat exchanger of hot flowpath.
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 the first heat exchange stream of First Heat Exchanger 32 is arranged in first throttle element 34
Between the entrance of first heat exchange flow path of the outlet and the second heat exchanger 33 on road.Restricting element 35 is heated to be arranged in 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 is changed
The outlet of hot flowpath is connected with one end of the other end of outdoor unit 10 and the indoor unit that freezes respectively.The other end of refrigeration indoor unit
It is connected with the outlet of the first heat exchange flow path of the second heat exchanger 33, the third 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.
In multi-line system heating (including multi-line system is with the operation of 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, it will lead to the inlet and outlet of heating indoor unit
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 as heating indoor unit locating for room temperature usually compared with
Low, liquid storage occurs for chance in heating chamber, and the leaving air temp for heating indoor unit will reduce, and decays so as to cause heating capacity, because
This needs to take measures to heat liquid extra in indoor unit and exhausts.Meanwhile lesser inlet outlet pressure differential can not only cause to make
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 middle pressure pressure value of part flow arrangement, the i.e. corresponding saturation temperature of the upstream pressure value of heating restricting element
Degree, Tm2 are temperature value before the valve for heating restricting element) it is relatively high.
And if the aperture of heating restricting element is too big, the inlet outlet pressure differential that will lead to heating indoor unit becomes larger, and enters
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
Cause the outlet subcooling of heating indoor unit too small, 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, causes 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 possible to rise not up, and the discharge superheat of compressor is relatively low sometimes.
If the aperture for heating restricting element is smaller, compresses at this time under conditions of hydrops does not occur for heating indoor unit
The discharge superheat of machine can be relatively high, and high pressure is also relatively high, and the running frequency of compressor is relatively low, and system energy efficiency can be very high.Cause
This, can make system by controlling the pressure difference value Δ P=Ps1-Ps2 between reasonable high-pressure Ps1 and middle pressure pressure Ps2
Not only it had been able to satisfy drain requirement, but also can have heating well and efficiency performance.
Fig. 2 is the flow chart that the control method of restricting element is heated in multi-line system according to an embodiment of the present invention.Such as
Shown in Fig. 2, in the multi-line system heat restricting element control method the following steps are included:
S1 obtains the target exhaust pressure or the corresponding saturation temperature of target exhaust pressure of compressor.
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 part flow arrangement high-pressure and middle pressure pressure, and calculate
Pressure difference value between high-pressure and middle pressure pressure.
Specifically, when multi-line system is with the operation of heating mode, main heating mode or main refrigeration mode, existed by setting
The pressure sensor of the exhaust ports of compressor obtains the pressure at expulsion Pc of compressor in real time, or in the row for getting compressor
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, with the pressure at expulsion Pc that after compressor stable operation, obtains new compressor, (or the corresponding saturation of pressure at expulsion is warm
Spend Tc) and part flow arrangement high-pressure Ps1 and middle pressure pressure Ps2.Wherein, high-pressure Ps1 can shunted by setting
The pressure sensor in the exit of the first heat exchange flow path of the First Heat Exchanger of device, which detects, to be obtained, and middle pressure pressure Ps2 can pass through
The pressure sensor detection that the inlet of the first heat exchange flow path of the second heat exchanger is arranged in obtains.
S3 obtains the goal pressure difference between the high-pressure of part flow arrangement and middle pressure pressure, and according to pressure difference value
It is adjusted with aperture of the goal pressure difference to heating restricting element.
It should be noted that goal pressure difference Δ Ps is dividing in system not hydrops by experimental verification acquisition
The pressure difference value between the high-pressure and middle pressure pressure of device is flowed, goal pressure difference Δ Ps is generally and lesser can protect
Cooling system agent flux is demonstrate,proved, and meets the value of high pressure.
According to one embodiment of present invention, according to pressure difference value and goal pressure difference to the aperture for heating restricting element
It is adjusted, comprising: if pressure difference value is greater than goal pressure difference, the aperture of heating restricting element is carried out turning control down
System；If pressure difference value is less than goal pressure difference, the aperture of heating restricting element is carried out tuning up control.
That is, compressor being adjusted to obtain the pressure at expulsion Pc of new compressor (or pressure at expulsion
Corresponding saturation temperature Tc) and high-pressure Ps1 and middle pressure pressure Ps2 under the premise of, heating restricting element is from initially opening
Degree, according between high-pressure Ps1 and middle pressure pressure Ps2 pressure difference value Δ P and goal pressure difference Δ Ps carry out PI adjusting.
If Δ P > Δ Ps, the aperture for heating restricting element turn down, at this time compressor pressure at expulsion Pc (or row
The corresponding saturation temperature Tc of atmospheric pressure) rise, and since flow reduces, Δ P becomes smaller.
If Δ P < Δ Ps, the aperture for heating restricting element are opened greatly, at this time compressor pressure at expulsion Pc (or row
The corresponding saturation temperature Tc of atmospheric pressure) decline, and since flow increases, Δ P becomes larger.
According to one embodiment of present invention, after the aperture to heating restricting element is adjusted, further includes: judgement pressure
Whether power difference is equal to goal pressure difference, and judges whether the corresponding saturation temperature of the current exhaust pressure of compressor is greater than
In the corresponding saturation temperature of target exhaust pressure of compressor, and judge whether the running frequency of compressor is more than or equal to maximum
Frequency；If the corresponding saturation temperature of current exhaust pressure that pressure difference value is equal to goal pressure difference or compressor is greater than
It is more than or equal to maximum frequency equal to the corresponding saturation temperature of target exhaust pressure of compressor or the running frequency of compressor,
The aperture for then controlling heating restricting element remains unchanged.
If pressure difference value is less than not equal to goal pressure difference, the corresponding saturation temperature of current exhaust pressure of compressor
The corresponding saturation temperature of target exhaust pressure of the compressor and running frequency of compressor is less than maximum frequency, then to compressor
Running frequency be adjusted, and according to the running frequency of the compressor after adjusting to heating restricting element aperture adjust
Section.
Specifically, after the aperture to heating restricting element is adjusted, Δ P=Δ Ps has been further determined whether, and Pc >=
Pcs (either Tc >=Tcs) or compressor have expired frequency.If Δ P=Δ Ps or Δ P ≠ Δ Ps but Pc >=Pcs (or
Tc >=Tcs) or Δ P ≠ Δ Ps but compressor expired frequency, then the aperture for controlling heating restricting element remains unchanged；Otherwise,
The running frequency of compressor is first adjusted, and the aperture for readjusting heating restricting element shows system until meeting above-mentioned condition
Have reached stable state, the aperture for heating restricting element can be stablized under the aperture, thus guarantee system under heating, especially
It is under sub-load heating, and the performance and efficiency of system can achieve more preferably.
To make those skilled in the art 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, heating the control method of restricting element in multi-line system can comprise the following steps that
S101 heats the current aperture of restricting element.
S102, the running frequency of compressor is according to pressure at expulsion Pc (or the corresponding saturation temperature Tc of pressure at expulsion) and target
Difference between pressure at expulsion Pcs (or the corresponding saturation temperature Tcs of target exhaust pressure) carries out PI adjusting, to obtain new row
Atmospheric pressure Pc (or the corresponding saturation temperature Tc of pressure at expulsion), high-pressure Ps1 and middle pressure pressure Ps2.
S103, according to the difference between pressure difference value Δ P and goal pressure difference Δ Ps to the aperture of heating restricting element
Carry out PI adjusting.
S104 turns down the aperture of heating restricting element if Δ P > Δ Ps.
S105 opens the aperture of big heating restricting element if Δ P < Δ Ps.
S106 judges whether to meet Δ P=Δ Ps, and Pc >=Pcs (or Tc >=Tcs) or compressor have expired frequency.If
It is to execute step S107；If not, return step S101.
S107, heating restricting element are stablized in the aperture, and system is stablized.
In conclusion heating the control method of restricting element in multi-line system according to an embodiment of the present invention, obtain first
Take the target exhaust pressure of compressor perhaps the corresponding saturation temperature of target exhaust pressure then according to target exhaust pressure or
The corresponding saturation temperature of target exhaust pressure is controlled such that compressor stable operation to compressor, and stablizes in compressor and transport
The high-pressure and middle pressure pressure of part flow arrangement are obtained after row, and calculate the pressure difference between high-pressure and middle pressure pressure
Value finally obtains the goal pressure difference between the high-pressure and middle pressure pressure of part flow arrangement, and according to pressure difference value and mesh
Mark pressure difference value quickly adjusts the aperture of heating restricting element, so that multi-line system is when heating, especially part
When load heats, it was not only able to satisfy drain requirement, but also can have good performance and efficiency, and had improved user experience.
Fig. 1 is the structural schematic diagram of multi-line system according to an embodiment of the invention.As shown in Figure 1, the multi-connected machine
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), and 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 the outlet and second of the first heat exchange flow path of the second heat exchanger 33 is arranged in heating restricting element 35
Between the entrance of second heat exchange flow path of heat exchanger 33.
Control module, target exhaust pressure or target exhaust pressure of the control module for obtaining compressor are corresponding full
And temperature, and pressure is controlled such that compressor according to target exhaust pressure or the corresponding saturation temperature of target exhaust pressure
Contracting machine stable operation, and after compressor stable operation obtain part flow arrangement 30 high-pressure and middle pressure pressure, control module
The pressure difference value between high-pressure and middle pressure pressure is calculated, and is obtained between the high-pressure of part flow arrangement 30 and middle pressure pressure
Goal pressure difference, and be adjusted according to the aperture of pressure difference value and goal pressure difference to heating restricting element 35.
Wherein, goal pressure difference is that the high-pressure of part flow arrangement and middle pressure in system not hydrops are obtained by experimental verification
Pressure difference value between pressure, the goal pressure difference be generally it is lesser can guarantee cooling system agent flux, and meet high
The value of pressure.
According to one embodiment of present invention, control module is according to pressure difference value and goal pressure difference to heating throttling member
When the aperture of part is adjusted, wherein if pressure difference value is greater than goal pressure difference, to heating restricting element if control module
35 aperture carries out turning control down；If pressure difference value is less than goal pressure difference, to heating restricting element 35 if control module
Aperture carry out tuning up control.
Specifically, in multi-line system heating, (including multi-line system is with heating mode, main heating mode or main refrigeration mould
Formula operation) when, especially under sub-load heating, control module first passes through the pressure sensing that the exhaust ports of compressor are arranged in
Device obtains the pressure at expulsion Pc of compressor in real time, or after getting the pressure at expulsion Pc of compressor, according to pressure at expulsion Pc
Obtain the corresponding saturation temperature Tc of pressure at expulsion.Then, control module is according to the pressure at expulsion Pc of compressor (or pressure at expulsion
Corresponding saturation temperature Tc) with the difference between target exhaust pressure Pcs (or target exhaust pressure corresponding saturation temperature Tcs)
It is worth and PI adjusting is carried out to the running frequency of compressor, obtains the pressure at expulsion of new compressor after compressor stable operation
The high-pressure Ps1 and middle pressure pressure Ps2 of Pc (or the corresponding saturation temperature Tc of pressure at expulsion) and part flow arrangement 30.Its
In, high-pressure Ps1 can by be arranged in part flow arrangement 30 First Heat Exchanger 32 first heat exchange flow path exit pressure
Force snesor detection obtains, and middle pressure pressure Ps2 can be by being arranged in the inlet of the first heat exchange flow path of second heat exchanger 33
Pressure sensor detection obtains.
Compressor is being adjusted to obtain the pressure at expulsion Pc of new compressor (or the corresponding saturation of pressure at expulsion
Temperature Tc) and high-pressure Ps1 and middle pressure pressure Ps2 under the premise of, control module according to high-pressure Ps1 and middle pressure pressure
Pressure difference value Δ P and goal pressure difference Δ Ps between power Ps2 carry out PI adjusting from initial opening to heating restricting element 35.
If Δ P > Δ Ps, the aperture that control module if controls heating restricting element 35 is turned down, the exhaust of compressor at this time
Pressure Pc (or the corresponding saturation temperature Tc of pressure at expulsion) rises, and since flow reduces, Δ P becomes smaller.
If Δ P < Δ Ps, the aperture that control module if controls heating restricting element 35 is opened greatly, the exhaust of compressor at this time
Pressure Pc (or the corresponding saturation temperature Tc of pressure at expulsion) decline, and since flow increases, Δ P becomes larger.
According to one embodiment of present invention, control module is after the aperture to heating restricting element 35 is adjusted, also
Judge whether pressure difference value is equal to goal pressure difference, and judges the corresponding saturation temperature of the current exhaust pressure of compressor
Whether it is more than or equal to the corresponding saturation temperature of target exhaust pressure of compressor, and judges whether the running frequency of compressor is big
In being equal to maximum frequency, and it is corresponding full in the current exhaust pressure that pressure difference value is equal to goal pressure difference or compressor
Saturation temperature corresponding more than or equal to the target exhaust pressure of compressor with temperature or the running frequency of compressor are more than or equal to
When maximum frequency, the aperture of control heating restricting element 35 is remained unchanged.
If pressure difference value is less than not equal to goal pressure difference, the corresponding saturation temperature of current exhaust pressure of compressor
The corresponding saturation temperature of target exhaust pressure of the compressor and running frequency of compressor is less than maximum frequency, control module is then
The running frequency of compressor is adjusted, and the opening to heating restricting element 35 according to the running frequency of the compressor after adjusting
Degree is adjusted.
Specifically, control module has further determined whether Δ P=Δ after the aperture to heating restricting element 35 is adjusted
Ps, and Pc >=Pcs (either Tc >=Tcs) or compressor have expired frequency.If Δ P=Δ Ps or Δ P ≠ Δ Ps but Pc >=
Pcs (perhaps Tc >=Tcs) or Δ P ≠ Δ Ps but compressor have expired frequency, and control module then controls heating restricting element 35
Aperture remains unchanged；Otherwise, control module first adjusts the running frequency of compressor, and readjusts opening for heating restricting element 35
Degree shows that system has reached stable state, the aperture of heating restricting element 35 can be stablized at this until meeting above-mentioned condition
Under aperture, to guarantee system under heating, especially under sub-load heating, the performance and efficiency of system be can achieve more
It is good.
Multi-line system according to an embodiment 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 after compressor stable operation obtain part flow arrangement high-pressure and
Middle pressure pressure, then, control module calculate the pressure difference value between high-pressure and middle pressure pressure, and obtain the height of part flow arrangement
Goal pressure difference between pressure pressure and middle pressure pressure, and according to pressure difference value and goal pressure difference to heating throttling member
The aperture of part is adjusted, so that multi-line system in heating, when especially sub-load heats, had both been able to satisfy drain and has wanted
It asks, and can have good performance and efficiency.
In the description of the present invention, it is to be understood that, term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.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 specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
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 spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. heating the control method of restricting element 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,
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 going out for the first heat exchange flow path of second heat exchanger is arranged in the heating restricting element
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 or the corresponding saturation temperature of the target exhaust pressure of the compressor；
The compressor is controlled according to the target exhaust pressure or the target exhaust pressure corresponding saturation temperature
Make so that the compressor stable operation, and obtain after the compressor stable operation part flow arrangement high-pressure and
Middle pressure pressure, and calculate the pressure difference value between the high-pressure and medium pressure pressure；And
The goal pressure difference between the high-pressure of the part flow arrangement and middle pressure pressure is obtained, and according to the pressure difference value
It is adjusted with aperture of the goal pressure difference to the heating restricting element.
2. heating the control method of restricting element in multi-line system according to claim 1, which is characterized in that according to institute
Pressure difference value and the goal pressure difference is stated the aperture of the heating restricting element is adjusted, comprising:
If the pressure difference value is greater than the goal pressure difference, the aperture of the heating restricting element is carried out turning control down
System；
If the pressure difference value is less than the goal pressure difference, the aperture of the heating restricting element is carried out tuning up control
System.
3. heating the control method of restricting element 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 includes:
Judge whether the pressure difference value is equal to the goal pressure difference, and judges the current exhaust pressure pair of the compressor
Whether the saturation temperature answered is more than or equal to the corresponding saturation temperature of target exhaust pressure of the compressor, and judges the pressure
Whether the running frequency of contracting machine is more than or equal to maximum frequency；
If the pressure difference value is equal to the goal pressure difference or the current exhaust pressure of the compressor is corresponding full
It is more than or equal to the running frequency of the corresponding saturation temperature of the target exhaust pressure of the compressor or the compressor with temperature
More than or equal to the maximum frequency, then the aperture for controlling the heating restricting element remains unchanged.
4. heating the control method of restricting element in multi-line system according to claim 3, which is characterized in that if institute
It states pressure difference value and is less than institute not equal to the goal pressure difference, the corresponding saturation temperature of current exhaust pressure of the compressor
The running frequency for stating the corresponding saturation temperature of target exhaust pressure of compressor and the compressor is less than the maximum frequency,
Then the running frequency of the compressor is adjusted, and is throttled according to the running frequency of the compressor after adjusting to the heating
The aperture of element is adjusted.
5. heating the control method of restricting element in multi-line system according to claim 1, which is characterized in that described more
On-line system works under heating mode, main heating mode or main refrigeration mode.
6. a kind of multi-line system characterized by comprising
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 entrance of first heat exchange flow path of the outlet and second heat exchanger of the first heat exchange flow path of device is connected, second heat exchange
The entrance of second heat exchange flow path of the outlet and First Heat Exchanger of the second heat exchange flow path of device is connected, the heating throttling
Exporting and the second heat exchange flow path of second heat exchanger for the first heat exchange flow path of second heat exchanger is arranged in element
Between entrance；
Control module, the control module are used to obtain the target exhaust pressure or the target exhaust pressure of the compressor
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 part flow arrangement after the compressor stable operation
High-pressure and middle pressure pressure, the control module calculates the pressure difference between the high-pressure and medium pressure pressure
Value, and the goal pressure difference between the high-pressure of the part flow arrangement and middle pressure pressure is obtained, and according to the pressure
The aperture of the heating restricting element is adjusted in difference and the goal pressure difference.
7. multi-line system according to claim 6, which is characterized in that the control module according to the pressure difference value and
When the aperture of the heating restricting element is adjusted in the goal pressure difference, wherein
If the pressure difference value is greater than the goal pressure difference, control module if, opens the heating restricting element
Degree carries out turning control down；
If the pressure difference value is less than the goal pressure difference, control module if, opens the heating restricting element
Degree carries out tuning up control.
8. multi-line system according to claim 6 or 7, which is characterized in that the control module is saved to the heating
After the aperture of fluid element is adjusted, also judge whether the pressure difference value is equal to the goal pressure difference, and judges
Whether the corresponding saturation temperature of the current exhaust pressure of the compressor is more than or equal to the target exhaust pressure pair of the compressor
The saturation temperature answered, and judge whether the running frequency of the compressor is more than or equal to maximum frequency, and in the pressure difference
Value is equal to the corresponding saturation temperature of current exhaust pressure of the goal pressure difference or the compressor more than or equal to described
The corresponding saturation temperature of target exhaust pressure of compressor or the running frequency of the compressor are more than or equal to the maximum frequency
When rate, the aperture for controlling the heating restricting element is remained unchanged.
9. multi-line system according to claim 8, which is characterized in that if the pressure difference value is not equal to the target
Pressure difference value, the compressor the corresponding saturation temperature of current exhaust pressure be less than the compressor target exhaust pressure pair
The running frequency of the saturation temperature and the compressor answered is less than the maximum frequency, and the control module is then to the compression
The running frequency of machine is adjusted, and according to the running frequency of the compressor after adjusting to it is described heating restricting element aperture into
Row is adjusted.
10. multi-line system according to claim 6, which is characterized in that multi-line system work heating mode,
Under main heating mode or main refrigeration mode.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610351236.9A CN106016457B (en) | 2016-05-23 | 2016-05-23 | Multi-line system and its control method for heating restricting element |
| PCT/CN2017/083654 WO2017202198A1 (en) | 2016-05-23 | 2017-05-09 | Multi-split system and method for controlling heating throttling element thereof |
| EP17802044.2A EP3467390B1 (en) | 2016-05-23 | 2017-05-09 | Multi-split system and method for controlling heating throttling element thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610351236.9A CN106016457B (en) | 2016-05-23 | 2016-05-23 | Multi-line system and its control method for heating restricting element |
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| Publication Number | Publication Date |
|---|---|
| CN106016457A CN106016457A (en) | 2016-10-12 |
| CN106016457B true CN106016457B (en) | 2018-12-18 |
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| CN201610351236.9A Active CN106016457B (en) | 2016-05-23 | 2016-05-23 | Multi-line system and its control method for heating restricting element |
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| Country | Link |
|---|---|
| EP (1) | EP3467390B1 (en) |
| CN (1) | CN106016457B (en) |
| WO (1) | WO2017202198A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106016457B (en) * | 2016-05-23 | 2018-12-18 | 广东美的暖通设备有限公司 | Multi-line system and its control method for heating restricting element |
| CN106556113B (en) * | 2016-11-28 | 2019-07-26 | 广东美的暖通设备有限公司 | Multi-line system and its middle pressure restricting element control method |
| CN107576110B (en) * | 2017-09-08 | 2019-12-27 | 合肥美的暖通设备有限公司 | Multi-split system and control method and control device thereof |
| CN110360704A (en) * | 2018-04-09 | 2019-10-22 | 珠海格力电器股份有限公司 | The compensation method of air conditioner connecting pipe pressure loss and device |
| CN111473466B (en) * | 2020-04-21 | 2022-03-22 | 宁波奥克斯电气股份有限公司 | Frequency control method and air conditioner |
| CN111578472B (en) * | 2020-05-29 | 2022-03-22 | 广东美的制冷设备有限公司 | Control method and device of air conditioner outdoor unit, air conditioner outdoor unit and air conditioner |
| CN114061107B (en) * | 2021-12-27 | 2023-11-28 | 上海美控智慧建筑有限公司 | Control method and system of multi-split air conditioning system |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN106016457A (en) | 2016-10-12 |
| EP3467390B1 (en) | 2021-02-17 |
| EP3467390A4 (en) | 2019-07-31 |
| WO2017202198A1 (en) | 2017-11-30 |
| EP3467390A1 (en) | 2019-04-10 |
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