CN101038097A - Refrigerating system of air-conditioning and method for controlling flow of refrigerant - Google Patents
Refrigerating system of air-conditioning and method for controlling flow of refrigerant Download PDFInfo
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- CN101038097A CN101038097A CNA2006100657485A CN200610065748A CN101038097A CN 101038097 A CN101038097 A CN 101038097A CN A2006100657485 A CNA2006100657485 A CN A2006100657485A CN 200610065748 A CN200610065748 A CN 200610065748A CN 101038097 A CN101038097 A CN 101038097A
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Abstract
The present invention discloses an air conditioner refrigerating system. A compressor, a four-way reversing valve and an outdoor heat exchanger are disposed on the outdoor machine. An indoor heat exchanger is disposed on the indoor machine. Two ports of the four-way reversing valve are connected to the air intake end and the air discharge end of the compressor, and another two ports of the four-way reversing valve are respectively connected to the outdoor heat exchanger and indoor heat exchanger. a capillary is connected between the outdoor heat exchanger and the indoor heat exchanger, an electronic expand valve is disposed between the capillary and the indoor heat exchanger, a liquid pipe temperature sensing apparatus is disposed between the electronic expand valve and the indoor heat exchanger, a inspiration temperature sensing apparatus is disposed at the air intake port of the compressor. The present invention also discloses a control method for refrigerant flux.
Description
Technical field
The present invention relates to a kind of air-conditioning technical, specifically, relate to a kind of air-conditioning refrigeration system and method for controlling flow of refrigerant.
Background technology
China Patent No. 98110372.3 discloses a kind of refrigeration system of multi-split air conditioner, comprise compressor, liquid reservoir, cross valve, device for drying and filtering, muffler, outdoor heat exchanger, corresponding precooling capillary, indoor heat exchanger, cross cold capillary, between the cold capillary of mistake of every indoor heat exchanger and correspondence thereof, be provided with corresponding electric expansion valve with certain pulse range, between compressor and cross valve, be provided with a compressor air-discharging point for measuring temperature Ti, be provided with corresponding refrigeration outlet point for measuring temperature Ti (the above natural number of i:5) at the indoor heat exchanger refrigeration port of export, outside between the cold capillary of all mistakes that all precooling capillaries of machine correspondence are corresponding with interior machine, draw the throttling branch road one time, this bypass line turns in the compressor first wife liquid reservoir successively by returning throttle capillary tube and backflow liquid reservoir thus, it is the compressor suction place, returning between throttle capillary tube and the backflow liquid reservoir of this branch road, be provided with point for measuring temperature T after the throttling
8, air-breathing point for measuring temperature T is set at the compressor suction place
2,, constitute compressor air suction temperature difference T by point for measuring temperature Ts after the throttling on this branch road and air-breathing point for measuring temperature T
2-T
8The control parameter, all point for measuring temperature T
1, T
2Ti converts through computer by the Information Monitoring of thermistor again, sends the control parameter of electromagnetic pulse by computer to the supporting coil of corresponding electric expansion valve, thereby controls the suitable aperture of corresponding electric expansion valve, realizes the adjusting of refrigerant condition.
In this invention technical scheme, between off-premises station heat exchanger exit and compressor air suction mouth, be provided with one road capillary, utilize the evaporation of cold-producing medium on this capillary to come the evaporation of machine refrigerant in evaporimeter in the simulating chamber, but the temperature inaccuracy that adopts the method for this simulation to measure can not accurately reflect the operating mode of indoor set, in addition, off-premises station can't be known the temperature of indoor set heat exchanger, can only simply simulate, therefore can not be accurately and timely to the adjusting of electronic expansion valve opening.
Summary of the invention
Technical problem solved by the invention provides a kind of air-conditioning refrigeration system, can control refrigerant flow according to operating condition.
Technical scheme of the present invention is as follows:
The compressor of air-conditioning refrigeration system, four-way change-over valve, outdoor heat exchanger is arranged on the off-premises station, indoor heat exchanger is arranged on the indoor set, two ports of described four-way change-over valve are connected with inlet end with the exhaust end of described compressor, two other port of described four-way change-over valve connects described outdoor heat exchanger and indoor heat exchanger respectively, be connected with capillary between outdoor heat exchanger and the indoor heat exchanger, between capillary and indoor heat exchanger, be provided with electric expansion valve, between electric expansion valve and indoor heat exchanger, be provided with liquid pipe temperature detector, be provided with air-breathing temperature detector at the air entry of compressor.
Preferably, the exhaust outlet of described compressor is provided with the exhaust temperature detector.
Preferably, be provided with A machine heat exchanger and B machine heat exchanger at indoor set, be provided with A machine capillary between A machine heat exchanger and the outdoor heat exchanger, be provided with B machine capillary between B machine heat exchanger and the outdoor heat exchanger, in A machine capillary and A unit room, be provided with A organic electronic expansion valve between the heat exchanger, in B machine capillary and B unit room, be provided with B organic electronic expansion valve between the heat exchanger, be provided with A machine liquid pipe temperature detector between heat exchanger and the A organic electronic expansion valve in the A unit room, be provided with B machine liquid pipe temperature detector between heat exchanger and the B organic electronic expansion valve in the B unit room, be respectively arranged with A indoor heat exchanger temperature detector and B indoor heat exchanger temperature detector in the A unit room in heat exchanger and the B unit room on the heat exchanger, indoor set is provided with A room temperature temperature detector and B room temperature temperature detector.
Preferably, described outdoor heat exchanger is provided with outdoor ring temperature temperature detector.
Preferably, between outdoor heat exchanger and capillary, be provided with filter.
Another one technical problem solved by the invention provides a kind of method for controlling flow of refrigerant, comprising:
(1) temperature of the corresponding measuring point of detection;
(2) according to the temperature parameter and the target component of corresponding measuring point the aperture of electric expansion valve is regulated;
(3) when the temperature parameter of measuring point equates with target component, keep the aperture of current electric expansion valve.
Preferably, when the single-unit blowdown firing, at this moment, target component is the target temperature difference,
Step (1) is specially, inspection liquid-measuring tube temperature and compressor air suction temperature;
Step (2) is specially, according to the difference of liquid pipe temperature and compressor air suction temperature and the aperture of target component adjusting electric expansion valve;
Step (3) is specially, and when the difference of liquid pipe temperature and compressor air suction temperature equals the target temperature difference, keeps the aperture of current electric expansion valve.
Preferably, step (2) is specially, and the difference of liquid pipe temperature and compressor air suction temperature reduces the aperture of electric expansion valve during greater than the target temperature difference, when the difference of liquid pipe temperature and compressor air suction temperature during less than the target temperature difference, increases the aperture of electric expansion valve.
Preferably, when the single-unit heat run, at this moment, electric expansion valve is in crack state, and target component is a target exhaust temperature,
Step (1) is specially, and detects delivery temperature;
Step (2) is specially, according to the aperture of delivery temperature and target component adjusting electric expansion valve;
Step (3) is specially, and when delivery temperature equals target exhaust temperature, keeps the aperture of current electric expansion valve.
Preferably, step (2) is specially, and when delivery temperature during greater than target exhaust temperature, increases the aperture of electric expansion valve, when delivery temperature during less than target exhaust temperature, reduces the aperture of electric expansion valve.
Preferably, when the double-unit system blowdown firing, at this moment, target component is the ratio of the specified nominal refrigerating capacity of heat exchanger in A machine and the B unit room,
Step (1) is specially, and detects indoor heat exchanger and indoor environment temperature;
Step (2) is specially, according to heat exchanger and indoor environment temperature difference in A machine and the B unit room and the ratio of specified nominal refrigerating capacity separately, and target component, the aperture of regulating two electric expansion valves;
Step (3) is specially, and when ratio equates, keeps the aperture of A machine and B machine respective electronic expansion valve.
Preferably, step (2) is specially, when the ratio of heat exchanger in the A unit room and indoor environment temperature difference and the specified nominal refrigerating capacity of A machine greater than the B unit room in during the ratio of heat exchanger and indoor environment temperature difference and the specified nominal refrigerating capacity of B machine, reduce the aperture of A organic electronic expansion valve, increase the aperture of B organic electronic expansion valve simultaneously; When the ratio of heat exchanger in the A unit room and indoor environment temperature difference and the specified nominal refrigerating capacity of A machine less than the B unit room in during the ratio of heat exchanger and indoor environment temperature difference and the specified nominal refrigerating capacity of B machine, increase the aperture of A organic electronic expansion valve, reduce the aperture of B organic electronic expansion valve simultaneously.
Preferably, step (1) further comprises, A machine and B machine are separately according to the aperture of the bias adjustment electric expansion valve separately of liquid pipe temperature and suction temperature.
Preferably, when the double-unit system heat run, at this moment, target component is the ratio of the specified nominal heating capacity of heat exchanger in A machine and the B unit room,
Step (1) is specially, and detects indoor heat exchanger and indoor environment temperature;
Step (2) is specially, according to the ratio of heat exchanger and indoor environment temperature difference and A machine in A machine and the B unit room and the specified separately nominal heating capacity of B machine, and target component, the aperture of regulating two electric expansion valves;
Step (3) is specially, and when ratio equates, keeps the aperture of A machine and B machine respective electronic expansion valve.
Preferably, step (2) is specially, when the ratio of heat exchanger in the A unit room and indoor environment temperature difference and the specified nominal heating capacity of A machine greater than the B unit room in during the ratio of heat exchanger and indoor environment temperature difference and the specified nominal heating capacity of B machine, reduce the aperture of A organic electronic expansion valve, increase the aperture of B organic electronic expansion valve simultaneously; When the ratio of heat exchanger in the A unit room and indoor environment temperature difference and the specified nominal heating capacity of A machine less than the B unit room in during the ratio of heat exchanger and indoor environment temperature difference and the specified nominal heating capacity of B machine, increase the aperture of A organic electronic expansion valve, reduce the aperture of B organic electronic expansion valve simultaneously.
Preferably, step (1) comprises that further A machine and B machine are regulated the aperture of electric expansion valve separately separately according to the difference of delivery temperature and target exhaust temperature.
Air-conditioning refrigeration system and method for controlling flow of refrigerant detect is variations in temperature after cold-producing medium flows through indoor set, and for each indoor set, whether can the accurate response refrigerant flow enough, whether electronic expansion valve opening be suitable.In addition when two-shipper, the room temperature in the sensing chamber and the temperature of heat exchanger, and compare with the specification capacity of its design, the operation conditions of air-conditioner in can two different rooms of accurate response, the room of the bigger cold of needs is carried out the compensation of cold, can real-time dynamically controlling to adjust.Just heat, technical solution of the present invention is to adopt compressor exhaust temperature to electronic expansion valve controls, the room temperature when detecting two-shipper simultaneously in the sensing chamber and the temperature of heat exchanger, and compare with the specification capacity of its design, the operation conditions of air-conditioner in can two different rooms of accurate response, the bigger heat of needs room is carried out the compensation of heat, can real-time dynamically controlling to adjust.
Description of drawings
Fig. 1 is the structure chart of air-conditioning refrigeration system preferred embodiment.
The specific embodiment
With reference to the accompanying drawings the preferred embodiments of the present invention are described in detail.
With reference to shown in Figure 1, the compressor 1 of air-conditioning refrigeration system, four-way change-over valve 2, outdoor heat exchanger 3 are arranged on the off-premises station 12.This preferred embodiment is the one drag two air-conditioner, and two indoor heat exchangers are arranged, and is respectively heat exchanger 9 and the interior heat exchanger 10 of B unit room in the A unit room, is arranged on the indoor set 11.Two ports of four-way change-over valve 2 are connected with inlet end with the exhaust end of compressor 1, two other port of four-way change-over valve 2 is junction chamber external heat exchanger 3 and interior heat exchanger 9 of A unit room and the interior heat exchanger 10 of B unit room respectively, wherein, the interior heat exchanger 10 of heat exchanger 9 and B unit room is connected in parallel in the A unit room.Outdoor heat exchanger 3 respectively with the A unit room in heat exchanger 9, be connected with A machine capillary 5 and B machine capillary 6 between the heat exchanger 10 in the B unit room, in two capillaries and A unit room, be respectively arranged with A organic electronic expansion valve 7 and B organic electronic expansion valve 8 in heat exchanger 9 and the B unit room between the heat exchanger 10, between two electric expansion valves and two indoor heat exchangers, be respectively arranged with A machine liquid pipe temperature detector T1a and B machine liquid pipe temperature detector T1b, be specially, be provided with A machine liquid pipe temperature detector T1a between heat exchanger 9 and the A organic electronic expansion valve 7 in the A unit room, be provided with B machine liquid pipe temperature detector T1b between heat exchanger 10 and the B organic electronic expansion valve 8 in the B unit room.Between outdoor heat exchanger 3 and two capillaries, be provided with filter 4.Air entry at compressor 1 is provided with air-breathing temperature detector Ts, the exhaust outlet of compressor 1 is provided with exhaust temperature detector Td, in the A unit room, be respectively arranged with A indoor heat exchanger temperature detector Tea and B indoor heat exchanger temperature detector Teb in heat exchanger 9 and the B unit room on the heat exchanger 10, indoor set is provided with A room temperature temperature detector Tra and B room temperature temperature detector Trb, and outdoor heat exchanger 3 is provided with outdoor ring temperature temperature detector Ta.
The emphasis of one drag two air-conditioner and difficult point are the control of cold-producing medium, the refrigerant flow control when particularly two-shipper turns round.In the preferred embodiment of the present invention, the control of refrigerant flow is by detecting the temperature of each one of refrigeration system, according to the target component of prior setting, realizes by the aperture of regulating electric expansion valve.
As shown in Figure 1, this preferred embodiment is in the single-unit blowdown firing time, and the electric expansion valve that is in the indoor set heat exchanger correspondence of closed condition also is in closed condition, and the electric expansion valve of the indoor set heat exchanger correspondence of duty can be regulated automatically.
When 9 work of A indoor set heat exchanger, when B indoor set heat exchanger 10 cuts out, the B organic electronic expansion valve 8 of B indoor set heat exchanger correspondence cuts out, by the temperature of detection A machine liquid pipe temperature detector T1a and the temperature of compressor air suction temperature detector Ts, by regulating the aperture of A organic electronic expansion valve 7, regulate the flow of cold-producing medium, control the actual temperature difference and equal the target temperature difference.The temperature of following A machine liquid pipe temperature detector T1a and the temperature difference of compressor air suction temperature detector Ts are represented with T1a-Ts.
Control the actual temperature difference (T1a-Ts)=target temperature difference, when the actual temperature difference＞target temperature difference, reduce electronic expansion valve opening, when the actual temperature difference＜target temperature difference, increase electronic expansion valve opening, when the actual temperature difference=target temperature difference, keep current electronic expansion valve opening.
Concrete steps are as follows:
Method for controlling flow of refrigerant comprises the following steps:
(1) temperature of the corresponding measuring point of detection is to detect the temperature of A machine liquid pipe temperature detector T1a and the temperature of compressor air suction temperature detector Ts specifically.
(2) according to the temperature of A machine liquid pipe temperature detector T1a and the temperature and the target temperature difference of compressor air suction temperature detector Ts, the aperture of A organic electronic expansion valve 7 is regulated.
Be specially, the difference of liquid pipe temperature and compressor air suction temperature (T1a-Ts) is during greater than the target temperature difference, reduce the aperture of A organic electronic expansion valve 7,, increase the aperture of A organic electronic expansion valve 7 when the difference (T1a-Ts) of liquid pipe temperature and compressor air suction temperature during less than the target temperature difference.
(3) when the temperature of temperature that detects A machine liquid pipe temperature detector T1a and compressor air suction temperature detector Ts equates with target temperature, keep the aperture of current A organic electronic expansion valve 7.
When the single-unit heat run, the electric expansion valve that is in the indoor set heat exchanger correspondence of closed condition is in crack state, and the electric expansion valve of the indoor set heat exchanger correspondence of duty can be regulated automatically.
Close to example when A indoor set heat exchanger 9 work B indoor set heat exchangers 10 and to illustrate, the B organic electronic expansion valve 8 of B indoor set heat exchanger 10 correspondences is in crack state, by detecting the temperature of exhaust temperature detector Td, control actual exhaust air temperature=target exhaust temperature, when actual exhaust air temperature＞target exhaust temperature, increase the aperture of A organic electronic expansion valve 7, when actual exhaust air temperature＜target exhaust temperature, reduce electronic expansion valve opening, when actual exhaust air temperature=target exhaust temperature, keep current A organic electronic expansion valve 7 apertures.
Concrete steps are as follows:
(1) temperature of detection exhaust temperature detector Td.
(2) regulate the aperture of A organic electronic expansion valve 7 according to delivery temperature and target exhaust temperature.
Be specially,, increase the aperture of A organic electronic expansion valve 7,, reduce the aperture of A organic electronic expansion valve 7 when delivery temperature during less than target exhaust temperature when delivery temperature during greater than target exhaust temperature.
(3) when delivery temperature equals target exhaust temperature, keep the aperture of current electric expansion valve.
When the double-unit system blowdown firing, if one of them indoor heat exchanger reaches design temperature, then unit running processing is pressed in flow-control.When two rooms all do not reach design temperature, electronic Expansion Valve Control is formed by stacking by two kinds of algorithms.Control on the one hand the deviation (same unit) of liquid pipe temperature and suction temperature separately, carry out assignment of traffic control according to the specification of two indoor heat exchangers of indoor set on the other hand, the ratio of the temperature difference (Trb-Teb) of the temperature difference (Tra-Tea) of control A room temperature temperature detector Tra and A indoor heat exchanger temperature detector Tea and B room temperature temperature detector Trb and B indoor heat exchanger temperature detector Teb is approximately equal to the ratio (Qa: Qb) of the specified nominal refrigerating capacity of heat exchanger 10 in interior heat exchanger 9 of A unit room and the B unit room, if (Tra-Tea): (Trb-Teb)＞(Qa: Qb), then reduce the aperture of A organic electronic expansion valve 7, increase the aperture of B organic electronic expansion valve 8 simultaneously; If (Tra-Tea): (Trb-Teb)＜(Qa: Qb), then increase the aperture of A organic electronic expansion valve 7, reduce the aperture of B organic electronic expansion valve 7 simultaneously, as (Tra-Tea): (Trb-Teb)=(Qa: Qb), keep two machine valve openings.At this moment, target component is the ratio of the specified nominal refrigerating capacity of heat exchanger in A machine and the B unit room.
Concrete steps are as follows:
(1) detects two indoor heat exchangers and indoor environment temperature;
(2), regulate the aperture of two electric expansion valves according to heat exchanger 10, indoor environment temperature difference, the ratio of specified nominal refrigerating capacity, and target component separately in heat exchanger 9, the B unit room in the A unit room.
When the ratio of the difference of heat exchanger 9 in the A unit room and A indoor heat exchanger temperature detector Tra and the specified nominal refrigerating capacity of A machine Qa greater than the B unit room in during the ratio of the difference of heat exchanger 10 and B indoor heat exchanger temperature detector Trb and the specified nominal refrigerating capacity of B machine Qb, promptly
The time, reduce the aperture of A organic electronic expansion valve 7, increase the aperture of B organic electronic expansion valve 8 simultaneously; When the ratio of heat exchanger 9 in the A unit room and A indoor heat exchanger temperature detector Tra difference and the specified nominal refrigerating capacity of A machine Qa less than the B unit room in during the ratio of heat exchanger 10 and B indoor heat exchanger temperature detector Trb difference and the specified nominal refrigerating capacity of B machine Qb, promptly
At this moment, increase the aperture of A organic electronic valve, reduce the aperture of B organic electronic expansion valve simultaneously, Ka and Kb are correction factor.
(3) when ratio equates, keep the aperture of A machine and B machine respective electronic expansion valve.
When the double-unit system heat run, at this moment, target component is the ratio of the specified nominal heating capacity of heat exchanger in A machine and the B unit room.If one of them indoor set reaches design temperature, then unit running processing is pressed in flow-control.When two rooms all do not reach design temperature, electronic Expansion Valve Control has two kinds of algorithms to be formed by stacking.Control is controlled the aperture of electric expansion valve separately according to temperature and the target exhaust temperature difference of actual exhaust air temperature detector Td on the one hand, carry out assignment of traffic control according to the specification of A and two indoor heat exchangers of B on the other hand, control (Tea-Tra): ratio (Teb-Trb) is approximately equal to the ratio (Qa: Qb) of A and the specified nominal heating capacity of B two machines, if (Tra-Tea): (Trb-Teb)＞(Qa: Qb), then reduce A machine valve opening, increase B machine valve opening simultaneously; If (Tra-Tea): (Trb-Teb)＜(Qa: Qb), then increase A machine valve opening, reduce B machine valve opening simultaneously, as (Tra-Tea): (Trb-Teb)=(Qa: Qb), keep two machine valve openings.
Concrete steps are as follows:
(1) detects two indoor heat exchangers and indoor environment temperature;
(2) according to the ratio of heat exchanger and indoor environment temperature difference and A machine in A machine and the B unit room and the specified separately nominal heating capacity of B machine, and target component, the aperture of regulating two electric expansion valves.
When the ratio of heat exchanger 9 in the A unit room and indoor environment temperature difference and the specified nominal heating capacity of A machine greater than the B unit room in during the ratio of heat exchanger 10 and indoor environment temperature difference and the specified nominal heating capacity of B machine, promptly
Reduce the aperture of A organic electronic expansion valve 7, increase the aperture of B organic electronic expansion valve 8 simultaneously; When the ratio of heat exchanger 9 in the A unit room and indoor environment temperature difference and the specified nominal heating capacity of A machine less than the B unit room in during the ratio of heat exchanger 10 and indoor environment temperature difference and the specified nominal heating capacity of B machine, promptly
Increase the aperture of A organic electronic expansion valve 7, reduce the aperture of B organic electronic expansion valve 8 simultaneously, Ka and Kb are correction factor.
(3) when ratio equates, keep the aperture of A machine and B machine respective electronic expansion valve.
In the process of control electronic expansion valve opening, according to the each amplitude and time interval of regulating of size control of the actual value value of departing from objectives.
The target exhaust temperature root of number numerical value of border environment temperature is factually revised, to satisfy the control needs under different temperature conditions.
This preferred embodiment is that example is set forth with the one drag two air-conditioning, can expand to the above situation of one drag two fully.When being used for the above air-conditioning of one drag two, indoor set of every increase, an indoor temperature transmitter of corresponding increase (Tr) and an indoor heat exchanger temperature sensor (Te).When the same one drag two of control in unit when running, a plurality of indoor sets running, shut down or reach the also same one drag two of indoor set control of design temperature.The adjusting of the indoor set electric expansion valve of a plurality of runnings also detects the temperature of each indoor room temperature and heat exchanger simultaneously, and compares with the specification capacity of its design, and the difference of room temperature and heat exchange temperature and indoor set capacity are adapted.Above-mentioned statement can be represented with following formula:
Claims (16)
1, a kind of air-conditioning refrigeration system, compressor, four-way change-over valve, outdoor heat exchanger is arranged on the off-premises station, indoor heat exchanger is arranged on the indoor set, it is characterized in that, two ports of described four-way change-over valve are connected with inlet end with the exhaust end of described compressor, two other port of described four-way change-over valve connects described outdoor heat exchanger and indoor heat exchanger respectively, be connected with capillary between outdoor heat exchanger and the indoor heat exchanger, between capillary and indoor heat exchanger, be provided with electric expansion valve, between electric expansion valve and indoor heat exchanger, be provided with liquid pipe temperature detector, be provided with air-breathing temperature detector at the air entry of compressor.
2, air-conditioning refrigeration system according to claim 1 is characterized in that, the exhaust outlet of described compressor is provided with the exhaust temperature detector.
3, according to claim 1 or 2 described air-conditioning refrigeration systems, it is characterized in that, be provided with A machine heat exchanger and B machine heat exchanger at indoor set, be provided with A machine capillary between A machine heat exchanger and the outdoor heat exchanger, be provided with B machine capillary between B machine heat exchanger and the outdoor heat exchanger, in A machine capillary and A unit room, be provided with A organic electronic expansion valve between the heat exchanger, in B machine capillary and B unit room, be provided with B organic electronic expansion valve between the heat exchanger, be provided with A machine liquid pipe temperature detector between heat exchanger and the A organic electronic expansion valve in the A unit room, be provided with B machine liquid pipe temperature detector between heat exchanger and the B organic electronic expansion valve in the B unit room, be respectively arranged with A indoor heat exchanger temperature detector and B indoor heat exchanger temperature detector in the A unit room in heat exchanger and the B unit room on the heat exchanger, indoor set is provided with A room temperature temperature detector and B room temperature temperature detector.
4, air-conditioning refrigeration system according to claim 3 is characterized in that, described outdoor heat exchanger is provided with outdoor ring temperature temperature detector.
5, air-conditioning refrigeration system according to claim 3 is characterized in that, is provided with filter between outdoor heat exchanger and capillary.
6, a kind of method for controlling flow of refrigerant comprises:
(1) temperature of the corresponding measuring point of detection;
(2) according to the temperature parameter and the target component of corresponding measuring point the aperture of electric expansion valve is regulated;
(3) when the temperature parameter of measuring point equates with target component, keep the aperture of current electric expansion valve.
7, method for controlling flow of refrigerant according to claim 6 is characterized in that, when the single-unit blowdown firing, at this moment, target component is the target temperature difference,
Step (1) is specially, inspection liquid-measuring tube temperature and compressor air suction temperature;
Step (2) is specially, according to the difference of liquid pipe temperature and compressor air suction temperature and the aperture of target component adjusting electric expansion valve;
Step (3) is specially, and when the difference of liquid pipe temperature and compressor air suction temperature equals the target temperature difference, keeps the aperture of current electric expansion valve.
8, method for controlling flow of refrigerant according to claim 7, it is characterized in that, step (2) is specially, the difference of liquid pipe temperature and compressor air suction temperature is during greater than the target temperature difference, reduce the aperture of electric expansion valve, when the difference of liquid pipe temperature and compressor air suction temperature during, increase the aperture of electric expansion valve less than the target temperature difference.
9, method for controlling flow of refrigerant according to claim 6 is characterized in that, when the single-unit heat run, at this moment, electric expansion valve is in crack state, and target component is a target exhaust temperature,
Step (1) is specially, and detects delivery temperature;
Step (2) is specially, according to the aperture of delivery temperature and target component adjusting electric expansion valve;
Step (3) is specially, and when delivery temperature equals target exhaust temperature, keeps the aperture of current electric expansion valve.
10, method for controlling flow of refrigerant according to claim 9 is characterized in that, step (2) is specially, when delivery temperature during greater than target exhaust temperature, increase the aperture of electric expansion valve,, reduce the aperture of electric expansion valve when delivery temperature during less than target exhaust temperature.
11, method for controlling flow of refrigerant according to claim 6 is characterized in that, when the double-unit system blowdown firing, at this moment, target component is the ratio of the specified nominal refrigerating capacity of heat exchanger in A machine and the B unit room,
Step (1) is specially, and detects indoor heat exchanger and indoor environment temperature;
Step (2) is specially, according to heat exchanger and indoor environment temperature difference in A machine and the B unit room and the ratio of specified nominal refrigerating capacity separately, and target component, the aperture of regulating two electric expansion valves;
Step (3) is specially, and when ratio equates, keeps the aperture of A machine and B machine respective electronic expansion valve.
12, method for controlling flow of refrigerant according to claim 11, it is characterized in that, step (2) is specially, when the ratio of heat exchanger in the A unit room and indoor environment temperature difference and the specified nominal refrigerating capacity of A machine greater than the B unit room in during the ratio of heat exchanger and indoor environment temperature difference and the specified nominal refrigerating capacity of B machine, reduce the aperture of A organic electronic expansion valve, increase the aperture of B organic electronic expansion valve simultaneously; When the ratio of heat exchanger in the A unit room and indoor environment temperature difference and the specified nominal refrigerating capacity of A machine less than the B unit room in during the ratio of heat exchanger and indoor environment temperature difference and the specified nominal refrigerating capacity of B machine, increase the aperture of A organic electronic expansion valve, reduce the aperture of B organic electronic expansion valve simultaneously.
According to claim 11 or 12 described method for controlling flow of refrigerant, it is characterized in that 13, step (1) further comprises, A machine and B machine are separately according to the aperture of the bias adjustment electric expansion valve separately of liquid pipe temperature and suction temperature.
14, method for controlling flow of refrigerant according to claim 6 is characterized in that, when the double-unit system heat run, at this moment, target component is the ratio of the specified nominal heating capacity of heat exchanger in A machine and the B unit room,
Step (1) is specially, and detects indoor heat exchanger and indoor environment temperature;
Step (2) is specially, according to the ratio of heat exchanger and indoor environment temperature difference and A machine in A machine and the B unit room and the specified separately nominal heating capacity of B machine, and target component, the aperture of regulating two electric expansion valves;
Step (3) is specially, and when ratio equates, keeps the aperture of A machine and B machine respective electronic expansion valve.
15, method for controlling flow of refrigerant according to claim 14, it is characterized in that, step (2) is specially, when the ratio of heat exchanger in the A unit room and indoor environment temperature difference and the specified nominal heating capacity of A machine greater than the B unit room in during the ratio of heat exchanger and indoor environment temperature difference and the specified nominal heating capacity of B machine, reduce the aperture of A organic electronic expansion valve, increase the aperture of B organic electronic expansion valve simultaneously; When the ratio of heat exchanger in the A unit room and indoor environment temperature difference and the specified nominal heating capacity of A machine less than the B unit room in during the ratio of heat exchanger and indoor environment temperature difference and the specified nominal heating capacity of B machine, increase the aperture of A organic electronic expansion valve, reduce the aperture of B organic electronic expansion valve simultaneously.
According to claim 14 or 15 described method for controlling flow of refrigerant, it is characterized in that 16, step (1) comprises that further A machine and B machine are regulated the aperture of electric expansion valve separately separately according to the difference of delivery temperature and target exhaust temperature.
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