CN107894112A - High drop method of controlling security and air-conditioning system - Google Patents

High drop method of controlling security and air-conditioning system Download PDF

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Publication number
CN107894112A
CN107894112A CN201711108432.4A CN201711108432A CN107894112A CN 107894112 A CN107894112 A CN 107894112A CN 201711108432 A CN201711108432 A CN 201711108432A CN 107894112 A CN107894112 A CN 107894112A
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CN
China
Prior art keywords
heat exchanger
refrigerant
liquid pipe
subcooler
pressure
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Granted
Application number
CN201711108432.4A
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Chinese (zh)
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CN107894112B (en
Inventor
于艳翠
胡强
沈军
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN201711108432.4A priority Critical patent/CN107894112B/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/029—Control issues
    • F25B2313/0291—Control issues related to the pressure of the indoor unit

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The present invention relates to a kind of high drop method of controlling security and air-conditioning system, method to include：Under the refrigerant circulation pattern for the second heat exchanger that refrigerant in the First Heat Exchanger of the first height and position flows to the second height and position along liquid pipe, and first height and position be higher than the second height and position, judge the liquid pipe pressure of First Heat Exchanger whether more than the first preset pressure value, if it exceeds, the refrigerant of First Heat Exchanger is then directed to refrigerant storage element and carries out refrigerant recovering, to reduce the liquid pipe pressure of First Heat Exchanger.The present invention is when the liquid pipe pressure for judging the First Heat Exchanger positioned at eminence exceedes preset pressure value, the refrigerant of First Heat Exchanger is directed to refrigerant storage element and carries out refrigerant recovering, to reduce the liquid pipe pressure of First Heat Exchanger, so as to reduce system pressure, and then the pressure of liquid refrigerants under higher drop is avoided to exceed the system risk brought during design pressure, and larger range of high drop installation requirement can also be met, improve security of system.

Description

High drop method of controlling security and air-conditioning system
Technical field
The present invention relates to airconditioning control field, more particularly to a kind of high drop method of controlling security and air-conditioning system.
Background technology
The indoor set heat exchanger and outdoor unit heat exchanger of multiple on-line system usually there will be certain drop when mounted.Machine The group profile book general provision high drop limit value of installation of multi-connected machine product, such as in 90m (outdoor unit heat exchanger is upper) and 50m (outdoor unit heat exchanger is under) left and right.If do not installed in actual installation according to the requirement of unit specification, cause Unconventional high drop installation, then there is pressure to surpass for outdoor unit heat exchanger or indoor set heat exchanger in building downside Cross the danger of design pressure.Due to higher drop between indoor and outdoor machine be present, thus the liquid pipe of long connection be internally formed it is larger Head of liquid, this causes liquid refrigerants when flowing into the equipment of building lowermost end, may be made because pressure exceedes design pressure Into the risk of system blast.
In order to reduce risk, generally use adjusts the mode of electric expansion valve according to detecting system pressure and temperature at present, To realize the regulation of system pressure.But this mode regulating power is limited, and systematic function is had a great influence, and can not ensure height The performance of unit in the case of the long connecting leg of drop.
The content of the invention
The purpose of the present invention is to propose to a kind of high drop method of controlling security and air-conditioning system, disclosure satisfy that larger range of High drop installation requirement, improve security of system.
To achieve the above object, the invention provides a kind of high drop method of controlling security, including：
Refrigerant in the First Heat Exchanger of the first height and position flows to the second heat exchanger of the second height and position along liquid pipe Refrigerant circulation pattern under, and first height and position is higher than second height and position, judges the First Heat Exchanger Whether liquid pipe pressure is more than the first preset pressure value, if it does, the refrigerant of the First Heat Exchanger then is directed into refrigerant storage Memory cell carries out refrigerant recovering, to reduce the liquid pipe pressure of the First Heat Exchanger.
Further, the first preset pressure value P0By the design pressure P of coolant circulating systemmaxIt is high with described first Spend position and the maximum difference H of second height and position is determined.
Further, the first preset pressure value P0Calculation formula be：
P0=Pmax-ρgH；
Wherein, ρ represents the density of the refrigerant, and g represents acceleration of gravity.
Further, after recovery refrigerant operation, in addition to：
If the liquid pipe pressure of the First Heat Exchanger is reduced to second pre- at least below first preset pressure value If pressure value, then stop the refrigerant of the First Heat Exchanger being directed to refrigerant storage element progress refrigerant recovering.
Further, the refrigerant storage element includes fluid reservoir, the fluid reservoir and the First Heat Exchanger and described Liquid pipe between second heat exchanger is connected by the first bypass line, on first bypass line provided with normally off the One control valve；
Recovery refrigerant operation specifically includes：
First control valve is opened, the refrigerant of the First Heat Exchanger is drained into along first bypass line described Refrigerant recovering is carried out in fluid reservoir.
Further, the First Heat Exchanger includes at least one indoor set heat exchanger, and second heat exchanger includes room Outer machine heat exchanger, the outdoor unit heat exchanger is connected by mode converter with least one indoor set heat exchanger, described Refrigerant circulation pattern is full heating mode or main body heating mode.
Further, the subcooler being located outside is additionally provided between the First Heat Exchanger and second heat exchanger, The subcooler branch road of the subcooler throttles to the refrigerant in the liquid pipe, and by the refrigerant obtained after throttling and the liquid The refrigerant that pipe flows through the subcooler main road of the subcooler is exchanged heat, and the refrigerant of the subcooler main road is flowed through with cooling；Institute Stating high drop method of controlling security also includes：
It is reduced in the liquid pipe pressure of the First Heat Exchanger and is preset at least below the second of first preset pressure value During pressure value, judge to set whether the liquid pipe refrigerant temperature of the subcooler branch road side changes less than described first in the liquid pipe Saturation temperature corresponding to the liquid pipe pressure of hot device, if it is less, reduce the aperture of the restricting element on the subcooler branch road, Otherwise maintain the aperture of the restricting element on the subcooler branch road constant.
Further, the liquid pipe pressure of the First Heat Exchanger is derived from the pressure of the liquid pipe house steward located at the mode converter Force snesor or the pressure sensor for being derived from the liquid pipe branch pipe located at each indoor set heat exchanger.
Further, second heat exchanger includes at least one indoor set heat exchanger, and the First Heat Exchanger includes room Outer machine heat exchanger, the outdoor unit heat exchanger is connected by mode converter with least one indoor set heat exchanger, described Refrigerant circulation pattern is full refrigeration mode or main body refrigeration mode.
Further, the subcooler being located outside is additionally provided between the First Heat Exchanger and second heat exchanger, The subcooler branch road of the subcooler throttles to the refrigerant in the liquid pipe, and by the refrigerant obtained after throttling and the liquid The refrigerant that pipe flows through the subcooler main road of the subcooler is exchanged heat, and the refrigerant of the subcooler main road is flowed through with cooling；Institute Stating high drop method of controlling security also includes：
It is reduced in the liquid pipe pressure of the First Heat Exchanger and is preset at least below the second of first preset pressure value During pressure value, judge to set whether the liquid pipe refrigerant temperature of the subcooler branch road side changes less than described first in the liquid pipe Saturation temperature corresponding to the liquid pipe pressure of hot device, if it is less, reducing opening for the restricting element in the second heat exchanger downstream Degree, otherwise maintains the aperture of the restricting element in the second heat exchanger downstream constant.
Further, in addition to：
Judge whether the liquid pipe pressure of the First Heat Exchanger is less than the 3rd preset pressure value, if be less than, by described in Refrigerant in refrigerant storage element is discharged into system refrigerant circulation circuit, is followed with increasing the refrigerant in the system refrigerant circulation circuit Circular rector, the 3rd preset pressure value are less than first preset pressure value.
Further, the 3rd preset pressure value PmBy the liquid pipe that the subcooler branch road side is set in the liquid pipe Saturation pressure corresponding to refrigerant temperature determines.
Further, the liquid pipe pressure of the First Heat Exchanger is derived from the liquid pipe house steward's located at the outdoor unit heat exchanger Pressure sensor.
To achieve the above object, the invention provides a kind of air-conditioning system, including：Refrigerant storage element, control unit with And form the compressor of system refrigerant circulation circuit, main throttling unit, the First Heat Exchanger in the first height and position and be in Second heat exchanger of the second height and position, first height and position are higher than second height and position；Described control unit energy Enough refrigerants in the First Heat Exchanger are flowed to along liquid pipe under the refrigerant circulation pattern of second heat exchanger, judge described the Whether the liquid pipe pressure of one heat exchanger is more than the first preset pressure value, if it does, then drawing the refrigerant of the First Heat Exchanger Lead the refrigerant storage element and carry out refrigerant recovering, to reduce the liquid pipe pressure of the First Heat Exchanger.
Further, the refrigerant storage element includes fluid reservoir, the fluid reservoir and the First Heat Exchanger and described Liquid pipe between second heat exchanger is connected by the first bypass line, on first bypass line provided with normally off the One control valve, described control unit can be by opening first control valve, to make the refrigerant of the First Heat Exchanger along institute State the first bypass line and drain into and refrigerant recovering is carried out in the fluid reservoir.
Further, described control unit after recovery refrigerant operation, can also judge the liquid of the First Heat Exchanger Pipe pressure is reduced to the second preset pressure value at least below first preset pressure value, if the liquid of the First Heat Exchanger Pipe pressure is reduced to the second preset pressure value at least below first preset pressure value, then stops the First Heat Exchanger Refrigerant be directed to refrigerant storage element carry out refrigerant recovering.
Further, the First Heat Exchanger includes at least one indoor set heat exchanger, and second heat exchanger includes room Outer machine heat exchanger, the outdoor unit heat exchanger is connected by mode converter with least one indoor set heat exchanger, described Refrigerant circulation pattern is full heating mode or main body heating mode.
Further, in addition to it is arranged between the First Heat Exchanger and second heat exchanger, and be located outside Subcooler, the subcooler branch road of the subcooler throttles to the refrigerant in the liquid pipe, and the refrigerant that will be obtained after throttling The refrigerant that the subcooler main road of the subcooler is flowed through with the liquid pipe is exchanged heat, and the subcooler main road is flowed through with cooling Refrigerant；Described control unit can also be reduced at least below the described first default pressure in the liquid pipe pressure of the First Heat Exchanger During the second preset pressure value of force value, judge to set in the liquid pipe subcooler branch road side liquid pipe refrigerant temperature whether Less than saturation temperature corresponding to the liquid pipe pressure of the First Heat Exchanger, if it is less, reducing on the subcooler branch road The aperture of restricting element, otherwise maintain the aperture of restricting element on the subcooler branch road constant.
Further, second heat exchanger includes at least one indoor set heat exchanger, and the First Heat Exchanger includes room Outer machine heat exchanger, the outdoor unit heat exchanger is connected by mode converter with least one indoor set heat exchanger, described Refrigerant circulation pattern is full refrigeration mode or main body refrigeration mode.
Further, in addition to it is arranged between the First Heat Exchanger and second heat exchanger, and be located outside Subcooler, the subcooler branch road of the subcooler throttles to the refrigerant in the liquid pipe, and the refrigerant that will be obtained after throttling The refrigerant that the subcooler main road of the subcooler is flowed through with the liquid pipe is exchanged heat, and the subcooler main road is flowed through with cooling Refrigerant；Described control unit can also be reduced at least below the described first default pressure in the liquid pipe pressure of the First Heat Exchanger During the second preset pressure value of force value, judge to set in the liquid pipe subcooler branch road side liquid pipe refrigerant temperature whether Less than saturation temperature corresponding to the liquid pipe pressure of the First Heat Exchanger, if it is less, reducing the second heat exchanger downstream Restricting element aperture, otherwise maintain the aperture of the restricting element in the second heat exchanger downstream constant.
Further, the refrigerant storage element includes fluid reservoir, and the fluid reservoir passes through normal closed gate and the system Refrigerant circulation circuit connects, and described control unit can also judge whether the liquid pipe pressure of the First Heat Exchanger is pre- less than the 3rd If pressure value, if be less than, the refrigerant in the refrigerant storage element is discharged into system refrigerant circulation circuit, with described in increase Refrigerant circulation in system refrigerant circulation circuit, the 3rd preset pressure value are less than first preset pressure value.
Further, the first preset pressure value P0By the design pressure P of coolant circulating systemmaxIt is high with described first Spend position and the maximum difference H of second height and position is determined.
Further, the 3rd preset pressure value Pm is by setting the liquid pipe of the subcooler branch road side in the liquid pipe Saturation pressure corresponding to refrigerant temperature determines.
Further, the liquid pipe house steward of the mode converter or each indoor set heat exchanger are arranged in addition to The pressure sensor of liquid pipe branch pipe, the sensing for the liquid pipe pressure for representing the First Heat Exchanger can be provided to described control unit Signal.
Further, in addition to be arranged on the outdoor unit heat exchanger liquid pipe house steward pressure sensor, can be to institute State the transducing signal that control unit provides the liquid pipe pressure for representing the First Heat Exchanger.
Based on above-mentioned technical proposal, the present invention exceedes default pressure in the liquid pipe pressure for judging the First Heat Exchanger positioned at eminence During force value, the refrigerant of First Heat Exchanger is directed to refrigerant storage element and carries out refrigerant recovering, to reduce the liquid of First Heat Exchanger Pipe pressure, so as to reduce system pressure, and then the pressure of liquid refrigerants under higher drop is avoided to exceed what is brought during design pressure System risk.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the indicative flowchart of an embodiment of the high drop method of controlling security of the present invention.
Fig. 2 is the indicative flowchart of another embodiment of the high drop method of controlling security of the present invention.
Fig. 3 is scheme of installation of the outdoor unit heat exchanger under.
Fig. 4 is outdoor unit heat exchanger in upper scheme of installation.
Fig. 5 is the indicative flowchart of the another embodiment of the high drop method of controlling security of the present invention.
Fig. 6 is the indicative flowchart of the another embodiment of the high drop method of controlling security of the present invention.
Fig. 7 is the schematic diagram of an embodiment of air-conditioning system of the present invention.
Fig. 8 is the schematic diagram of another embodiment of air-conditioning system of the present invention.
Description of reference numerals
1-compressor；2-heat tape；3-exhaust temperature-sensitive bag；4-high-voltage switch gear；5-oil eliminator；6-high pressure pressure Force snesor；7th, 8-four-way valve；9-filter；10-capillary；11-blower fan；12-outdoor heat exchanger outlet pipe temperature-sensitive bag； 13-outdoor unit heat exchanger；14-subcooler；15-subcooler liquid goes out temperature-sensitive bag；16-vapour liquid separator；17-vapour divides inlet pipe Temperature-sensitive bag；18-low-pressure sensor；19-vapour separates pipe temperature-sensitive bag；20-fluid reservoir；21-outer machine liquid pipe pressure sensing Device；22-outer machine liquid pipe stop valve；23-outer machine low pressure gas pipe stop valve；24-outer machine high-pressure air pipe stop valve；25-pattern Converter；26A, 26B-indoor set heat exchanger；27-mode converter liquid pipe manifold pressure sensor；30-liquid pipe house steward； 31-low pressure gas pipe house steward；32-high-pressure air pipe house steward；V1, V4, V6, V7, V9, V12-magnetic valve；V10、V13、V14A/ V14B-electric expansion valve；V2, V3, V8, V11-check valve；V5-unloading valve；A1-compressor；A2-main throttling unit； A3-First Heat Exchanger；The heat exchangers of A4-second；A5-refrigerant storage element.
Embodiment
Below by drawings and examples, technical scheme is described in further detail.
As shown in figure 1, the indicative flowchart of the embodiment for the high drop method of controlling security of the present invention.In this implementation In example, high drop method of controlling security includes：
Step 101, the refrigerant in the First Heat Exchanger of the first height and position flow to the of the second height and position along liquid pipe Under the refrigerant circulation pattern of two heat exchangers, and first height and position is higher than second height and position, judges described first Whether the liquid pipe pressure P of heat exchanger is more than the first preset pressure value P0, if it does, then performing step 102；
Step 102, the refrigerant of the First Heat Exchanger is directed to refrigerant storage element progress refrigerant recovering, to reduce State the liquid pipe pressure P of First Heat Exchanger.
Wherein, the judgement operation of step 101 in real time or can be performed regularly, if judging first in step 101 The liquid pipe pressure P of heat exchanger is not less than the first preset pressure value P0, then can continue to compare and judge with return to step 101.
The refrigerant storage element being related in a step 102, which can include fluid reservoir, (can also use other similar functions Refrigerant storage facility), for storing the liquid refrigerants reclaimed from coolant circulating system.Accordingly, fluid reservoir can with it is described Liquid pipe between First Heat Exchanger and second heat exchanger is connected by the first bypass line, and in first bypass line Upper the first control valve that normally off is set.When needing to perform the recovery refrigerant operation of step 102, unlatching first can be controlled Control valve, so that the refrigerant of the First Heat Exchanger drains into along first bypass line carries out refrigerant time in the fluid reservoir Receive.
The first preset pressure value P in the present embodiment0Can be by the design pressure P of coolant circulating systemmaxWith described first The maximum difference H of height and position and second height and position is determined.May have in view of indoor set heat exchanger it is multiple, and be distributed At various height, therefore between indoor set heat exchanger and outdoor unit heat exchanger different differences in height be present, and maximum here Difference H refers to the maximum difference H between indoor set heat exchanger and outdoor unit heat exchanger.Maximum difference H can by outside input or Obtained by measuring.Wherein, the first preset pressure value P0Calculation formula be, for example,：
P0=Pmax-ρgH；
Wherein, ρ represents the density of the refrigerant, and g represents acceleration of gravity.
Under gravity, when the liquid pipe refrigerant of high drop flows from the top down, refrigerant pressure gradually rises with flow direction, The liquid pipe pressure P for making the First Heat Exchanger positioned at eminence by the refrigerant reclaimed in liquid pipe is no more than P0, so that positioned at low The pressure P+ ρ gH of second heat exchanger at place are unlikely to exceed design pressure Pmax(being usually the limiting pressure of air-conditioning system), and then System safety is ensure that, the pressure for avoiding liquid refrigerants under higher drop exceedes the system risk brought during design pressure.Separately On the one hand, the present embodiment also meets larger range of high drop installation requirement, improves security of system.
Except using above-mentioned determination P0Formula example outside, also can as needed use other forms formula example, Such as P0=Pmax- ρ gH+a or P0=b (Pmax- ρ gH) etc. deformation formula, wherein a and b be adjustable variable as needed Parameter.
As shown in Fig. 2 the indicative flowchart of another embodiment of the high drop method of controlling security of the present invention.It is real with upper one Example is applied to compare, after the recovery refrigerant operation of step 102, in addition to：
Step 103, judge whether the liquid pipe pressure P of First Heat Exchanger is reduced to the second preset pressure value P1, it is to perform Step 104, otherwise return to step 102 continues to reclaim refrigerant operation；
Step 104, stop the refrigerant of the First Heat Exchanger being directed to refrigerant storage element progress refrigerant recovering.
In the present embodiment, the second preset pressure value P1At least below the first preset pressure value P0。P1It can be arranged to and P0 Equal pressure value, P can also be positioned slightly below0Pressure value, with reduce reclaim and stop reclaimer operation frequently cutting The problem of changing.
For the present embodiment, no matter installation form of the outdoor unit heat exchanger as shown in Figure 3 under or such as Fig. 4 institutes The outdoor unit heat exchanger shown in the case where coordinating corresponding refrigerant circulation pattern, may be suitable for above-mentioned step in upper installation form Rapid 101 judgement operation and the refrigerant recovering operation of step 102.
With reference to figure 3, in one embodiment, First Heat Exchanger includes at least one indoor set heat exchanger 26A, 26B, and second Heat exchanger includes outdoor unit heat exchanger 13, and outdoor unit heat exchanger 13 passes through mode converter and at least one indoor set heat exchanger 26A, 26B are connected.Corresponding to highest installation site indoor set heat exchanger 26A the first height and position with being changed corresponding to outdoor unit Height difference between second height and position of the hot installation site of device 13 is between indoor set heat exchanger and outdoor unit heat exchanger Maximum difference H.And refrigerant flows to the refrigerant corresponding to outdoor unit heat exchanger 13 from indoor set heat exchanger 26A and 26B along liquid pipe Circulation pattern is full heating mode or main body heating mode.In the present embodiment, the liquid pipe pressure P of First Heat Exchanger can be derived from Located at the pressure sensor of the liquid pipe house steward of mode converter, the pressure sensor is located at the liquid pipe house steward of mode converter, energy It is enough to detect liquid pipe pressure P of the liquid pipe pressure of indoor set heat exchanger side as First Heat Exchanger real-time or non real-time.Another In individual embodiment, the liquid pipe pressure P of First Heat Exchanger can also be derived from the pressure of the liquid pipe branch pipe located at each indoor set heat exchanger Force snesor, the pressure value obtained by the pressure sensor of the liquid pipe branch pipe of each indoor set heat exchanger can be according to default rule Then handled to determine the liquid pipe pressure P of First Heat Exchanger, such as take minimum value or arithmetic mean of instantaneous value etc..
Full heating mode is also referred to as complete heating mode, and the mode of operation for referring to the indoor set heat exchanger of all starts is system Heat pattern, now refrigerant carries out condensation heat release in whole indoor set heat exchangers, and is evaporated heat absorption in outdoor unit heat exchanger.It is main System heat pattern then refers to that the mode of operation of the part indoor set heat exchanger of start is refrigeration mode, and another part indoor set exchanges heat The mode of operation of device is heating mode, and the indoor set that the indoor set heat exchanger total capacity of refrigeration mode is less than heating mode exchanges heat Device total capacity, now refrigerant condensation heat release is carried out by the part indoor set heat exchanger of heating, subsequently into the part room of refrigeration Interior machine heat exchanger and outdoor unit heat exchanger are evaporated heat absorption.
With reference to figure 4, in another embodiment, the second heat exchanger includes at least one indoor set heat exchanger 26A, 26B, the One heat exchanger includes outdoor unit heat exchanger 13, and outdoor unit heat exchanger 13 passes through mode converter and at least one indoor set heat exchanger 26A, 26B are connected.Corresponding to the installation site of outdoor unit heat exchanger 13 the first height and position with corresponding to minimum installation site Height difference between indoor set heat exchanger 26B the second height and position is between indoor set heat exchanger and outdoor unit heat exchanger Maximum difference H.And refrigerant flows to the refrigerant corresponding to indoor set heat exchanger 26A and 26B from outdoor unit heat exchanger 13 along liquid pipe Circulation pattern is full refrigeration mode or main body refrigeration mode.In another embodiment, the liquid pipe pressure of First Heat Exchanger can be with It is derived from the pressure sensor of the liquid pipe house steward located at outdoor unit heat exchanger.
Here full refrigeration mode is also referred to as complete refrigeration mode, refers to the mode of operation of the indoor set heat exchanger of all starts It is refrigeration mode, now refrigerant carries out condensation heat release in outdoor unit heat exchanger, and enter in the indoor set heat exchanger of all starts Row evaporation endothermic.Main body refrigeration mode then refers to that the mode of operation of the part indoor set heat exchanger of start is refrigeration mode, another The mode of operation of part indoor set heat exchanger is heating mode, and the indoor set heat exchanger total capacity of refrigeration mode is more than heating mould The indoor set heat exchanger total capacity of formula, now refrigerant entered by the part indoor set heat exchanger of outdoor unit heat exchanger and heating mode Row condensation heat release, heat absorption is evaporated subsequently into the part indoor set heat exchanger of refrigeration mode.
As shown in figure 5, the indicative flowchart of the another embodiment for the high drop method of controlling security of the present invention.In this reality Apply in example, First Heat Exchanger includes at least one indoor set heat exchanger 26A, 26B, and the second heat exchanger includes outdoor unit heat exchanger 13, outdoor unit heat exchanger 13 is connected by mode converter 25 with least one indoor set heat exchanger 26A, 26B.In view of at this Under kind installation form, if refrigerant circulation pattern is full refrigeration mode or main body refrigeration mode, liquid refrigerants is in liquid pipe Flow direction is bottom-up, is not in the problem of causing system pressure to exceed design pressure because of high drop, therefore can be with Mainly consider situation of the refrigerant circulation pattern for full heating mode or main body heating mode in such a situation.Accordingly, Ke Yi Perform step 101 before increase judge refrigerant circulation pattern whether be full heating mode or main body heating mode operation, if It is not full heating mode or main body heating mode to judge refrigerant circulation pattern, then the high drop that need not carry out the present invention is controlled safely Process processed.
In order to further cool down the high-pressure liquid refrigerant in refrigerant circulation circuit, can be exchanged heat in First Heat Exchanger and second The subcooler being located outside further is set between device, and the subcooler branch road of the subcooler saves to the refrigerant in liquid pipe Stream, and the refrigerant for the subcooler main road that the refrigerant obtained after throttling is flowed through into subcooler with liquid pipe is exchanged heat, and is flowed through with cooling The refrigerant of subcooler main road.
Compared with a upper embodiment, the high drop method of controlling security of the present embodiment after step 104, in addition to：
Step 105a, it is reduced in the liquid pipe pressure of the First Heat Exchanger at least below first preset pressure value During the second preset pressure value, judge to set the liquid pipe refrigerant temperature T of the subcooler branch road side in the liquid pipemWhether it is less than Saturation temperature T corresponding to the liquid pipe pressure P of the First Heat Exchanger0, if it is less, performing step 106a, otherwise perform step Rapid 107a；
Step 106a, maintain the aperture of the restricting element on the subcooler branch road constant；
Step 107a, the aperture of the restricting element on the subcooler branch road is reduced.
By the liquid pipe refrigerant temperature T for judging subcooler branch road sidemWhether T is less than0, it may be determined that it is current in the liquid pipe Whether contain gaseous coolant in the liquid refrigerants flowed through, if greater than equal to T0, then illustrate not to be pure liquid refrigerants in liquid pipe, this When can influence the restriction effect of system refrigerant circulation circuit.And now reduce the throttling member on subcooler branch road by step 107a The aperture of part, the coolant throttle effect of subcooler branch road is improved, the refrigerant temperature after throttling is reduced, by being changed with subcooler main road Heat can make the liquid pipe refrigerant temperature T of subcooler branch road sidemReduce, to ensure that system refrigerant is pure liquid before throttling as far as possible Refrigerant, so as to improve the heat transfer effect of air-conditioner set and performance by ensureing unit degree of supercooling.
If judged result is T in step 105amLess than T0, or the T after step 107amLess than T0, now should illustrate It is pure liquid refrigerants in the liquid refrigerants currently flowed through in liquid pipe, therefore executable step 106a, that is, maintain on subcooler branch road Restricting element aperture it is constant.
As shown in fig. 6, the indicative flowchart of the another embodiment for the high drop method of controlling security of the present invention.In this reality Apply in example, the second heat exchanger includes at least one indoor set heat exchanger 26A, 26B, and First Heat Exchanger includes outdoor unit heat exchanger 13, outdoor unit heat exchanger 13 is connected by mode converter with least one indoor set heat exchanger 26A, 26B.In view of this Under installation form, if refrigerant circulation pattern is full heating mode or main body heating mode, stream of the liquid refrigerants in liquid pipe Dynamic direction is bottom-up, is not in the problem of causing system pressure to exceed design pressure because of high drop, therefore can be Such a situation mainly considers situation of the refrigerant circulation pattern for full refrigeration mode or main body refrigeration mode.Accordingly, can hold Before row step 101, increase judges whether refrigerant circulation pattern is the operation of full refrigeration mode or main body refrigeration mode, if sentenced Disconnected refrigerant circulation pattern is not full refrigeration mode or main body refrigeration mode, then need not carry out the high drop security control of the present invention Process.
In order to further cool down the high-pressure liquid refrigerant in refrigerant circulation circuit, can be exchanged heat in First Heat Exchanger and second The subcooler being located outside further is set between device, and the subcooler branch road of the subcooler saves to the refrigerant in liquid pipe Stream, and the refrigerant for the subcooler main road that the refrigerant obtained after throttling is flowed through into subcooler with liquid pipe is exchanged heat, and is flowed through with cooling The refrigerant of subcooler main road.
Compared with Fig. 2 embodiments, the high drop method of controlling security of the present embodiment after step 104, in addition to：
Step 105b, it is reduced in the liquid pipe pressure of the First Heat Exchanger at least below first preset pressure value During the second preset pressure value, judge to set the liquid pipe refrigerant temperature T of the subcooler branch road side in the liquid pipemWhether it is less than Saturation temperature T corresponding to the liquid pipe pressure of the First Heat Exchanger0, if it is less, performing step 106b, otherwise perform step 107b；
Step 106b, maintain the aperture of the restricting element in the second heat exchanger downstream constant；
Step 107b, the aperture of the restricting element in the second heat exchanger downstream is reduced.
By the liquid pipe refrigerant temperature T for judging subcooler branch road sidemWhether T is less than0, it may be determined that it is current in the liquid pipe Whether contain gaseous coolant in the liquid refrigerants flowed through, if greater than equal to T0, then illustrate not to be pure liquid refrigerants in liquid pipe, this When can influence the restriction effect of system refrigerant circulation circuit.And step 107b is now performed to reduce the section in the second heat exchanger downstream The aperture of fluid element, the coolant throttle effect of the restricting element can be increased so that drop by the refrigerant temperature of the restricting element It is low, so that the liquid pipe refrigerant temperature T of subcooler branch road sidemReduce, to ensure that system refrigerant is pure liquid before throttling as far as possible State refrigerant, so as to improve the heat transfer effect of air-conditioner set and performance by ensureing unit degree of supercooling.
If judged result is T in step 105bmLess than T0, or the T after step 107bmLess than T0, now should illustrate It is pure liquid refrigerants in the liquid refrigerants currently flowed through in liquid pipe, therefore executable step 106b, that is, maintain under the second heat exchanger The aperture of the restricting element of trip is constant.
For outdoor unit heat exchanger in upper mounting means, system pressure can be reduced by way of recovering liquid refrigerant Power, to reduce system risk, but if the liquid pipe pressure of First Heat Exchanger reduces excessively so that in system refrigerant circulation circuit Refrigerant is very few, so as to influence the normal work of air-conditioning system.Therefore in another embodiment, high drop method of controlling security is also It can include：Judge whether the liquid pipe pressure of the First Heat Exchanger is less than the 3rd preset pressure value, if be less than, by described in Refrigerant in refrigerant storage element is discharged into system refrigerant circulation circuit, is followed with increasing the refrigerant in the system refrigerant circulation circuit Circular rector.
3rd preset pressure value PmLess than the first preset pressure value P0.Thus pass through the refrigerant of refrigerant storage element Reclaim and discharge to cause the liquid pipe pressure of First Heat Exchanger to maintain the first preset pressure value P0With the second preset pressure value PmIt Between, it is ensured that the safety of high drop air-conditioning system.3rd preset pressure value PmBy setting the subcooler branch road in the liquid pipe Saturation pressure corresponding to the liquid pipe refrigerant temperature of side determines, such as by PmIt is taken as the liquid pipe refrigerant temperature of subcooler branch road side The numerical value of corresponding saturation pressure or the correlometer formula of the numerical value.
The above-mentioned high drop method of controlling security of the present invention is applicable to all kinds of internal-external machine setting height(from bottom) be present and drop be present Air-conditioning system or possess refrigeration or heat-production functions miscellaneous equipment, be particularly suitable for install drop it is larger or to installation fall Difference is than more sensitive air-conditioning system, such as multi-connected machine Air Conditioning System with Heat or heat pump multi-connected machine system etc..It is corresponding to perform The operation that pressure, temperature compare and judged, and recovery to refrigerant storage element and the control of release can use air-conditioning system Control system outside control unit or air-conditioning system in system is realized.
As shown in fig. 7, the schematic diagram of the embodiment for air-conditioning system of the present invention.In the present embodiment, air-conditioning System includes：Refrigerant storage element A5, control unit and formation system refrigerant circulation circuit compressor A1 (can be replaced by Double-compressor or enthalpy-increasing compressor), main throttling unit A2, the First Heat Exchanger A3 in the first height and position and high in second Spend the second heat exchanger A4 of position.Wherein, the first height and position is higher than the second height and position.
Under a kind of refrigerant circulation pattern, the high pressure gaseous refrigerant of compressor A1 discharges enters into First Heat Exchanger A3 Row condensation heat release, main throttling unit A2 and the second heat exchanger A4 are flowed to by the condensed refrigerants of First Heat Exchanger A3 along liquid pipe, And heat absorption is evaporated in the second heat exchanger A4, compressor A1 is then back to, so as to constitute basic system refrigerant circulation Loop.The lines with arrow illustrate traffic direction of the refrigerant under the refrigerant circulation pattern in Fig. 7.It should be noted that Here the citing that the description of the composition to air-conditioning system and system refrigerant circulation circuit is carried out merely for convenience of description, not It is strictly limited to specific air-conditioning system construction or specific system refrigerant circulation circuit.And refrigerant storage element A5 is in this reality The function of system refrigerant recovering can be realized by applying in example, and can also realize returned to system refrigerant circulation in another embodiment The function of refrigerant is discharged in road, the set location and connected mode of the refrigerant storage element A5 shown in Fig. 7 is only for explanation side Just, it also should not be construed as the considered critical to its set location and connected mode.Below also will be specifically specific for one Air-conditioning system embodiment be further detailed.
Control unit can flow to the cold of the second heat exchanger A4 in the refrigerant in this First Heat Exchanger A3 along liquid pipe Under matchmaker's circulation pattern, judge the liquid pipe pressure P of the First Heat Exchanger A3 whether more than the first preset pressure value P0It is if super Cross, then the refrigerant of the First Heat Exchanger A3 is directed into the refrigerant storage element A5 carries out refrigerant recovering, with described in reduction First Heat Exchanger A3 liquid pipe pressure P.Here the first preset pressure value P0Can be by the design pressure P of coolant circulating systemmaxWith The maximum difference H of first height and position and second height and position is determined.
In another embodiment, refrigerant storage element A5 includes fluid reservoir, fluid reservoir and the First Heat Exchanger A3 and Liquid pipe between the second heat exchanger A4 is connected by the first bypass line.It can be set on first bypass line often First control valve of closed state, control unit can be by opening first control valve, to make the First Heat Exchanger A3's Refrigerant drains into along first bypass line and refrigerant recovering is carried out in the fluid reservoir.
In another embodiment, control unit can also judge the First Heat Exchanger after recovery refrigerant operation A3 liquid pipe pressure is reduced to the second preset pressure value at least below first preset pressure value, if first heat exchange Device A3 liquid pipe pressure is reduced to the second preset pressure value at least below first preset pressure value, then stops described the One heat exchanger A3 refrigerant is directed to refrigerant storage element A5 and carries out refrigerant recovering.
With reference to the mounting means shown in figure 3, in one embodiment, the First Heat Exchanger A3 in air-conditioning system is included at least One indoor set heat exchanger, and the second heat exchanger A4 includes outdoor unit heat exchanger, the outdoor unit heat exchanger passes through patten transformation Device is connected with least one indoor set heat exchanger, and the refrigerant circulation pattern is full heating mode or main body heating mode. In view of under this installation form, if refrigerant circulation pattern is full refrigeration mode or main body refrigeration mode, liquid is cold Matchmaker is bottom-up in the flow direction of liquid pipe, is not in cause system pressure asking beyond design pressure because of high drop Topic, therefore can mainly consider situation of the refrigerant circulation pattern for full heating mode or main body heating mode in such a situation.Phase Answer, whether control unit can also carry out refrigerant circulation pattern before the judgement of liquid pipe pressure of First Heat Exchanger is carried out For the judgement of full heating mode or main body heating mode.
It may further include in the air-conditioning system embodiment and be arranged on the First Heat Exchanger A3 and described second and change Between hot device A4, and the subcooler being located outside.The subcooler branch road of the subcooler can be carried out to the refrigerant in the liquid pipe Throttling, and the refrigerant for the subcooler main road that the refrigerant obtained after throttling is flowed through into the subcooler with the liquid pipe is exchanged heat, The refrigerant of the subcooler main road is flowed through with cooling.Accordingly, control unit can also be in the liquid pipe of the First Heat Exchanger A3 When pressure is reduced to the second preset pressure value at least below first preset pressure value, judge in the liquid pipe described in setting Whether the liquid pipe refrigerant temperature of subcooler branch road side is less than saturation temperature corresponding to the liquid pipe pressure of the First Heat Exchanger A3, If it is less, maintaining the aperture of the restricting element on the subcooler branch road constant, otherwise reduce on the subcooler branch road Restricting element aperture.
In above-mentioned air-conditioning system embodiment of the outdoor unit heat exchanger under, it can also include being arranged on the patten transformation The pressure sensor of the liquid pipe branch pipe of the liquid pipe house steward of device or each indoor set heat exchanger, can be carried to described control unit For the transducing signal for the liquid pipe pressure for representing the First Heat Exchanger A3.
With reference to the mounting means shown in figure 4, in one embodiment, the second heat exchanger A4 in air-conditioning system is included at least One indoor set heat exchanger, the First Heat Exchanger A3 include outdoor unit heat exchanger, and the outdoor unit heat exchanger is turned by pattern Parallel operation is connected with least one indoor set heat exchanger, and the refrigerant circulation pattern is full refrigeration mode or main body refrigeration mould Formula.In view of under this installation form, if refrigerant circulation pattern is full heating mode or main body heating mode, liquid Refrigerant is bottom-up in the flow direction of liquid pipe, is not in cause system pressure asking beyond design pressure because of high drop Topic, therefore can mainly consider situation of the refrigerant circulation pattern for full refrigeration mode or main body refrigeration mode in such a situation.Phase Answer, whether control unit can also carry out refrigerant circulation pattern before the judgement of liquid pipe pressure of First Heat Exchanger is carried out For the judgement of full refrigeration mode or main body refrigeration mode.
It may further include in the air-conditioning system embodiment and be arranged on the First Heat Exchanger A3 and described second and change Between hot device A4, and the subcooler being located outside, the subcooler branch road of the subcooler save to the refrigerant in the liquid pipe Stream, and the refrigerant for the subcooler main road that the refrigerant obtained after throttling is flowed through into the subcooler with the liquid pipe is exchanged heat, with Cooling flows through the refrigerant of the subcooler main road.Accordingly, control unit can also be in the liquid pipe pressure of the First Heat Exchanger A3 When power is reduced to the second preset pressure value at least below first preset pressure value, judge to set the mistake in the liquid pipe Whether the liquid pipe refrigerant temperature of cooler branch road side is less than saturation temperature corresponding to the liquid pipe pressure of the First Heat Exchanger A3, such as Fruit is less than, then maintains the aperture of the restricting element in the second heat exchanger A4 downstreams constant, otherwise reduce second heat exchanger The aperture of the restricting element in A4 downstreams.
Include fluid reservoir for refrigerant storage element A5, the fluid reservoir passes through normal closed gate and the system refrigerant circulation Loop connects, and outdoor unit heat exchanger can also judge the First Heat Exchanger in upper air-conditioning system embodiment, control unit Whether A3 liquid pipe pressure is less than the 3rd preset pressure value, if be less than, the refrigerant in the refrigerant storage element A5 is arranged Enter system refrigerant circulation circuit, to increase the refrigerant circulation in the system refrigerant circulation circuit, the 3rd preset pressure Value is less than first preset pressure value.Here the 3rd preset pressure value PmCan be by setting the subcooler branch in the liquid pipe Saturation pressure corresponding to the liquid pipe refrigerant temperature of road side determines.
In outdoor unit heat exchanger in upper above-mentioned air-conditioning system embodiment, it can also be changed including being arranged on the outdoor unit The pressure sensor of the liquid pipe house steward of hot device, the liquid pipe pressure for representing the First Heat Exchanger A3 can be provided to described control unit The transducing signal of power.
The explanation of each embodiment of above-mentioned air-conditioning system refers to the interior of foregoing high each embodiment of drop method of controlling security Hold the explanation with technique effect, repeat no more here.Each embodiment is described by the way of progressive in this specification, Mei Geshi Apply that example stresses is all the difference with other embodiment, and identical similar portion is mutually referring to i.e. between each embodiment Can.
Below in conjunction with the multi-connected machine Air Conditioning System with Heat example shown in Fig. 8 as air-conditioning system embodiment of the present invention Schematic structure comes illustratively high drop security control applicable pattern within air-conditioning systems and flow.
In fig. 8, outer machine liquid pipe pressure sensor 21 is located proximate to outer machine liquid pipe stop valve 24.When air-conditioning system is complete When refrigeration mode or main body refrigeration mode, BC is switched to connect four-way valve 7, AD connections, four-way valve 8AB connections, CD connections. System refrigerant can form following circulation loop：
Refrigerant escapes and enter oil eliminator 5 from compressor 1 after the compression of compressor 1 in the form of high pressure gaseous, Rear portion high-pressure gaseous refrigerant carry out condensation heat release into outdoor unit heat exchanger 13 through four-way valve 7, it is cold to form high-pressure liquid Matchmaker.High-pressure liquid refrigerant flows after magnetic valve V12 and check valve V11 enters the further supercooling of subcooler 14 through liquid pipe house steward 30 Enter in mode converter 25.Now, electric expansion valve V10 apertures standard-sized sheet, magnetic valve V12 are opened.Subcooler 14 draws branch road High-pressure liquid refrigerant, and through electronics expansion valve V13 throttling after go into the relatively low gas-liquid two-phase state refrigerant of pressure, temperature, and with master The high-pressure liquid refrigerant heat exchange on road, to reach the purpose of the further high-pressure liquid refrigerant of cooling main road.And branch road refrigerant absorbs heat After be incorporated in low pressure gas pipe house steward 31, eventually enter into vapour liquid separator 16.Another part high pressure gas come out from oil eliminator 5 State refrigerant enters in high-pressure air pipe house steward 32 through four-way valve 8, imports in mode converter 25.Fluid reservoir 20 passes through branch road and liquid pipe House steward 31 is connected, and when magnetic valve V7 is opened, the liquid refrigerants in liquid pipe house steward 31 can be recycled in fluid reservoir 20.Separately Outside, in the branch road of connection fluid reservoir 20, magnetic valve V6 is normally open, and magnetic valve V4, V7, V9 are normally offs.
Refrigerant distributes between mode converter 25 plays internal-external machine, i.e., according to indoor set heat exchanger 26A, 26B start mould Formula demand, different refrigerants is conveyed to indoor set heat exchanger 26A, 26B.When indoor set heat exchanger 26A, 26B start are refrigeration During pattern, mode converter 25 by from the refrigerant that liquid pipe house steward 30 comes through electronics corresponding to indoor set heat exchanger 26A, the 26B Machine heat exchanger 26A, 26B heat absorption evaporation are got in after expansion valve V14A, V14B throttling, forms low-pressure gaseous refrigerant or low pressure gas The phase refrigerant of liquid two.The refrigerant is imported in the interior pusher side tracheae that mode converter 25 connects after flowing out the indoor set heat exchanger.
When indoor set heat exchanger 26A, 26B start are heating mode, mode converter 25 will be from high-pressure air pipe house steward 32 The high-pressure gaseous refrigerant to come over is condensed into high-pressure liquid refrigerant through indoor set heat exchanger 26A, 26B, high-pressure liquid refrigerant warp Indoor set heat exchanger 26A, 26B corresponding to being flowed into after electric expansion valve V14A, V14B reducing pressure by regulating flow, then import mode converter In the interior pusher side liquid pipe of 25 connections, the liquid refrigerants will converge with the refrigerant in liquid pipe house steward 30, be transported to refrigeration mould together Other indoor set heat exchangers of formula.In addition, the low-pressure gaseous refrigerant of the indoor set of refrigeration mode is delivered to by mode converter 25 In low pressure gas pipe house steward, converge with the branch road refrigerant of subcooler 14 into vapour liquid separator 16, low pressure refrigerant after gas-liquid separation, Gaseous coolant enters compressor 1.
Air-conditioning system in this operating mode, can if employing outdoor unit shown in Fig. 4 in upper mounting means Judge whether the pressure P that outer machine liquid pipe pressure sensor 21 measures is more than the first preset pressure value P0；If P>P0, open valve V6, V7, shutoff valve V4, V9, until P<P0, is then shut off valve V7, and other valve states are constant；But also record is arranged on subcooler The subcooler liquid of branch road side goes out the liquid pipe refrigerant temperature T that temperature-sensitive bag 15 measuresm1, and its corresponding saturation pressure is calculated as the 3rd Preset pressure value Pm, and close magnetic valve V12.
If P is in [Pm,P0], then continue to judge, and maintain each valve state；If P<Pm, then magnetic valve V4, V9 are opened, Magnetic valve V6, V7 are closed, the refrigerant in fluid reservoir 20 is drained into system refrigerant circulation circuit, until P >=Pm.When meeting that P exists [Pm,P0] when, calculate saturation temperature T corresponding to pressure P0, then judge that the subcooler liquid of now subcooler branch road side goes out temperature-sensitive bag The 15 liquid pipe refrigerant temperature T measuredmWhether T is less than0, if it is less, keeping electric expansion valve V13 apertures constant；Otherwise reduce Electric expansion valve V13 aperture is until Tm<T0, to ensure that refrigerant is entering throttling unit (such as the electric expansion valve of interior pusher side V14A, V14B) before be pure liquid refrigerants, ensure restriction effect.
In fig. 8, when air-conditioning system is full heating mode or during main body heating mode, AB is switched to connect four-way valve 7 It is logical, CD connections；Four-way valve 8AB is connected, CD connections.System refrigerant can form following circulation loop：
Refrigerant escapes and enter oil eliminator 5 from compressor 1 after the compression of compressor 1 in the form of high pressure gaseous, High-pressure gaseous refrigerant enters in high-pressure air pipe house steward 32 through four-way valve 8 afterwards, imports in mode converter 25.Mode converter 25 The refrigerant that machine liquid pipe comes out of heating is conveyed to liquid pipe house steward 30, the refrigerant of liquid pipe house steward 30 enters after subcooler 14 cools down Further throttled through electric expansion valve V10, be evaporated to low pressure refrigerant, low pressure refrigerant warp into the heat absorption of outdoor unit heat exchanger 13 afterwards Four-way valve 7 is flowed into low pressure gas pipe house steward 31, eventually enters into vapour liquid separator 16.Enter after the branch road refrigerant heat absorption of subcooler 14 In low pressure gas pipe house steward, vapour liquid separator 16 is eventually entered into.The branch road and main road heat transfer process of subcooler 14 are as before, this In do not repeating.
Refrigerant distributes between mode converter 25 plays internal-external machine, i.e., according to indoor set heat exchanger 26A, 26B start mould Formula demand, different refrigerants is conveyed to indoor set heat exchanger 26A, 26B.When indoor set heat exchanger 26A, 26B start are heating During pattern, the high-pressure gaseous refrigerant to come from high-pressure air pipe house steward 32 is delivered to indoor set heat exchanger by mode converter 25 26A, 26B are condensed into high-pressure liquid refrigerant, after high-pressure liquid refrigerant electric expansion valve V14A, V14V reducing pressure by regulating flow corresponding to Flow out and import in the interior pusher side liquid pipe that mode converter 25 is connected.
When indoor set heat exchanger 26A, 26B start are refrigeration mode, mode converter 25 is by from the interior machine of heating mode A part of refrigerant that liquid pipe comes is delivered to electric expansion valve V14A, V14B corresponding to the indoor set heat exchanger 26A, 26B, throttling After get in machine heat exchanger 26A, 26B heat absorption evaporation, form low-pressure gaseous refrigerant or the phase refrigerant of low-pressure gas-liquid two, outflow is simultaneously Import in the interior pusher side tracheae that mode converter 25 connects.Meanwhile mode converter 25 by out of heating machine liquid pipe come it is another A part of refrigerant is delivered in liquid pipe house steward 30.In addition, mode converter 25 is also by the low-pressure gaseous of the indoor set of refrigeration mode Refrigerant is delivered in low pressure gas pipe house steward 31, and the refrigerant to come with the branch road refrigerant of subcooler 14 and from outdoor unit heat exchanger 13 converges Conjunction enters vapour liquid separator 16, and for low pressure refrigerant after gas-liquid separation, gaseous coolant enters compressor 1.
Air-conditioning system in this operating mode, can if employing mounting means of the outdoor unit under shown in Fig. 3 Whether the pressure P that judgment model converter liquid pipe manifold pressure sensor 27 measures is more than the first preset pressure value P0；If P> P0, open valve V6, V7, shutoff valve V4, V9, until P<P0, valve V7 is then shut off, other valve states are constant.But also calculate pressure Saturation temperature T corresponding to power P0。
If P is reduced to the second preset pressure value P1(P1≤P0), then judge the subcooler liquid of now subcooler branch road side Go out the liquid pipe refrigerant temperature T that temperature-sensitive bag 15 measuresmWhether T is less than0；If it is less, the indoor set 26A of holding heating mode, Electric expansion valve V14A, V14B aperture are constant corresponding to 26B；Otherwise corresponding to indoor set 26A, the 26B for reducing heating mode Electric expansion valve V14A, V14B aperture are until Tm<T0, to ensure that refrigerant is entering outer pusher side throttling unit (such as electronic expansion Valve V10) before be pure liquid refrigerants, ensure restriction effect.
Finally it should be noted that:The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still The embodiment of the present invention can be modified or equivalent substitution is carried out to some technical characteristics；Without departing from this hair The spirit of bright technical scheme, it all should cover among the claimed technical scheme scope of the present invention.

Claims (25)

1. a kind of high drop method of controlling security, including：
Refrigerant in the First Heat Exchanger of the first height and position flows to the cold of the second heat exchanger of the second height and position along liquid pipe Under matchmaker's circulation pattern, and first height and position is higher than second height and position, judges the liquid pipe of the First Heat Exchanger Whether pressure is more than the first preset pressure value, if it does, it is single that the refrigerant of the First Heat Exchanger then is directed into refrigerant storage Member carries out refrigerant recovering, to reduce the liquid pipe pressure of the First Heat Exchanger.
2. high drop method of controlling security according to claim 1, wherein, the first preset pressure value P0Followed by refrigerant The design pressure P of loop systemmaxDetermined with the maximum difference H of first height and position and second height and position.
3. high drop method of controlling security according to claim 2, wherein, the first preset pressure value P0Calculating it is public Formula is：
P0=Pmax-ρgH；
Wherein, ρ represents the density of the refrigerant, and g represents acceleration of gravity.
4. high drop method of controlling security according to claim 1, wherein, after recovery refrigerant operation, in addition to：
If the liquid pipe pressure of the First Heat Exchanger is reduced to presets pressure at least below the second of first preset pressure value Force value, then stop the refrigerant of the First Heat Exchanger being directed to refrigerant storage element progress refrigerant recovering.
5. high drop method of controlling security according to claim 1, wherein, the refrigerant storage element includes fluid reservoir, Liquid pipe between the fluid reservoir and the First Heat Exchanger and second heat exchanger is connected by the first bypass line, in institute State the first control valve that the first bypass line is provided with normally off；
Recovery refrigerant operation specifically includes：
First control valve is opened, the refrigerant of the First Heat Exchanger is drained into the liquid storage along first bypass line Refrigerant recovering is carried out in tank.
6. high drop method of controlling security according to claim 1, wherein, the First Heat Exchanger includes at least one room Interior machine heat exchanger, second heat exchanger include outdoor unit heat exchanger, and the outdoor unit heat exchanger passes through mode converter and institute At least one indoor set heat exchanger connection is stated, the refrigerant circulation pattern is full heating mode or main body heating mode.
7. high drop method of controlling security according to claim 6, wherein, changed in the First Heat Exchanger and described second The subcooler being located outside is additionally provided between hot device, the subcooler branch road of the subcooler saves to the refrigerant in the liquid pipe Stream, and the refrigerant for the subcooler main road that the refrigerant obtained after throttling is flowed through into the subcooler with the liquid pipe is exchanged heat, with Cooling flows through the refrigerant of the subcooler main road；The high drop method of controlling security also includes：
The second preset pressure at least below first preset pressure value is reduced in the liquid pipe pressure of the First Heat Exchanger During value, judge to set whether the liquid pipe refrigerant temperature of the subcooler branch road side is less than the First Heat Exchanger in the liquid pipe Liquid pipe pressure corresponding to saturation temperature, if it is less, maintain the aperture of the restricting element on the subcooler branch road constant, Otherwise the aperture of the restricting element on the subcooler branch road is reduced.
8. high drop method of controlling security according to claim 6, wherein, the liquid pipe pressure of the First Heat Exchanger is derived from Located at the liquid pipe house steward of the mode converter pressure sensor or be derived from the liquid located at each indoor set heat exchanger The pressure sensor of pipe branch pipe.
9. high drop method of controlling security according to claim 1, wherein, second heat exchanger includes at least one room Interior machine heat exchanger, the First Heat Exchanger include outdoor unit heat exchanger, and the outdoor unit heat exchanger passes through mode converter and institute At least one indoor set heat exchanger connection is stated, the refrigerant circulation pattern is full refrigeration mode or main body refrigeration mode.
10. high drop method of controlling security according to claim 9, wherein, in the First Heat Exchanger and described second The subcooler being located outside is additionally provided between heat exchanger, the subcooler branch road of the subcooler is carried out to the refrigerant in the liquid pipe Throttling, and the refrigerant for the subcooler main road that the refrigerant obtained after throttling is flowed through into the subcooler with the liquid pipe is exchanged heat, The refrigerant of the subcooler main road is flowed through with cooling；The high drop method of controlling security also includes：
The second preset pressure at least below first preset pressure value is reduced in the liquid pipe pressure of the First Heat Exchanger During value, judge to set whether the liquid pipe refrigerant temperature of the subcooler branch road side is less than the First Heat Exchanger in the liquid pipe Liquid pipe pressure corresponding to saturation temperature, if it is less, maintaining the aperture of the restricting element in the second heat exchanger downstream not Become, otherwise reduce the aperture of the restricting element in the second heat exchanger downstream.
11. high drop method of controlling security according to claim 10, wherein, in addition to：
Judge whether the liquid pipe pressure of the First Heat Exchanger is less than the 3rd preset pressure value, if be less than, by the refrigerant Refrigerant in storage element is discharged into system refrigerant circulation circuit, to increase the refrigerant circulation in the system refrigerant circulation circuit Amount, the 3rd preset pressure value are less than first preset pressure value.
12. high drop method of controlling security according to claim 11, wherein, the 3rd preset pressure value PmBy described Saturation pressure corresponding to the liquid pipe refrigerant temperature of the subcooler branch road side is set to determine in liquid pipe.
13. high drop method of controlling security according to claim 9, wherein, the liquid pipe pressure of the First Heat Exchanger takes From the pressure sensor of the liquid pipe house steward located at the outdoor unit heat exchanger.
14. a kind of air-conditioning system, including：Refrigerant storage element, control unit and the compression for forming system refrigerant circulation circuit Machine, main throttling unit, the First Heat Exchanger in the first height and position and the second heat exchanger in the second height and position, it is described First height and position is higher than second height and position；Described control unit can be in the refrigerant in the First Heat Exchanger along liquid Whether pipe is flowed under the refrigerant circulation pattern of second heat exchanger, judge the liquid pipe pressure of the First Heat Exchanger more than first Preset pressure value, returned if it does, the refrigerant of the First Heat Exchanger then is directed into the refrigerant storage element and carries out refrigerant Receive, to reduce the liquid pipe pressure of the First Heat Exchanger.
15. air-conditioning system according to claim 14, wherein, the refrigerant storage element includes fluid reservoir, the liquid storage Liquid pipe between tank and the First Heat Exchanger and second heat exchanger is connected by the first bypass line, by described first Siphunculus road is provided with the first control valve of normally off, and described control unit can be by opening first control valve, to make The refrigerant of the First Heat Exchanger drains into along first bypass line and refrigerant recovering is carried out in the fluid reservoir.
16. air-conditioning system according to claim 14, wherein, described control unit can also operate it in recovery refrigerant Afterwards, judge that the liquid pipe pressure of the First Heat Exchanger is reduced to the second preset pressure at least below first preset pressure value Value, if the liquid pipe pressure of the First Heat Exchanger is reduced to the second preset pressure at least below first preset pressure value Value, then stop the refrigerant of the First Heat Exchanger being directed to refrigerant storage element progress refrigerant recovering.
17. air-conditioning system according to claim 14, wherein, the First Heat Exchanger exchanges heat including at least one indoor set Device, second heat exchanger include outdoor unit heat exchanger, and the outdoor unit heat exchanger passes through mode converter and described at least one Individual indoor set heat exchanger connection, the refrigerant circulation pattern is full heating mode or main body heating mode.
18. air-conditioning system according to claim 17, wherein, in addition to it is arranged on the First Heat Exchanger and described second Between heat exchanger, and the subcooler being located outside, the subcooler branch road of the subcooler save to the refrigerant in the liquid pipe Stream, and the refrigerant for the subcooler main road that the refrigerant obtained after throttling is flowed through into the subcooler with the liquid pipe is exchanged heat, with Cooling flows through the refrigerant of the subcooler main road；Described control unit can also reduce in the liquid pipe pressure of the First Heat Exchanger During to the second preset pressure value at least below first preset pressure value, judge to set the subcooler branch in the liquid pipe Whether the liquid pipe refrigerant temperature of road side is less than saturation temperature corresponding to the liquid pipe pressure of the First Heat Exchanger, if it is lower, Then maintain the aperture of the restricting element on the subcooler branch road constant, otherwise reduce the restricting element on the subcooler branch road Aperture.
19. air-conditioning system according to claim 14, wherein, second heat exchanger exchanges heat including at least one indoor set Device, the First Heat Exchanger include outdoor unit heat exchanger, and the outdoor unit heat exchanger passes through mode converter and described at least one Individual indoor set heat exchanger connection, the refrigerant circulation pattern is full refrigeration mode or main body refrigeration mode.
20. air-conditioning system according to claim 19, wherein, in addition to it is arranged on the First Heat Exchanger and described second Between heat exchanger, and the subcooler being located outside, the subcooler branch road of the subcooler save to the refrigerant in the liquid pipe Stream, and the refrigerant for the subcooler main road that the refrigerant obtained after throttling is flowed through into the subcooler with the liquid pipe is exchanged heat, with Cooling flows through the refrigerant of the subcooler main road；Described control unit can also reduce in the liquid pipe pressure of the First Heat Exchanger During to the second preset pressure value at least below first preset pressure value, judge to set the subcooler branch in the liquid pipe Whether the liquid pipe refrigerant temperature of road side is less than saturation temperature corresponding to the liquid pipe pressure of the First Heat Exchanger, if it is lower, Then maintain the aperture of the restricting element in the second heat exchanger downstream constant, otherwise reduce the throttling in the second heat exchanger downstream The aperture of element.
21. air-conditioning system according to claim 20, wherein, the refrigerant storage element includes fluid reservoir, the liquid storage Tank is connected by normal closed gate with the system refrigerant circulation circuit, and described control unit can also judge the First Heat Exchanger Liquid pipe pressure whether be less than the 3rd preset pressure value, if be less than, the refrigerant in the refrigerant storage element be discharged into be System refrigerant circulation circuit, to increase the refrigerant circulation in the system refrigerant circulation circuit, the 3rd preset pressure value is low In first preset pressure value.
22. air-conditioning system according to claim 14, wherein, the first preset pressure value P0By coolant circulating system Design pressure PmaxDetermined with the maximum difference H of first height and position and second height and position.
23. air-conditioning system according to claim 21, wherein, the 3rd preset pressure value PmBy being set in the liquid pipe Saturation pressure corresponding to the liquid pipe refrigerant temperature of the subcooler branch road side determines.
24. air-conditioning system according to claim 17, wherein, in addition to it is arranged on the liquid pipe house steward of the mode converter Or the pressure sensor of the liquid pipe branch pipe of each indoor set heat exchanger, it can be provided to described control unit and represent described the The transducing signal of the liquid pipe pressure of one heat exchanger.
25. air-conditioning system according to claim 19, wherein, in addition to be arranged on the outdoor unit heat exchanger liquid pipe it is total The pressure sensor of pipe, the transducing signal for the liquid pipe pressure for representing the First Heat Exchanger can be provided to described control unit.
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