CN106907876A - Air-conditioning system and its evaporating temperature control method - Google Patents

Air-conditioning system and its evaporating temperature control method Download PDF

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Publication number
CN106907876A
CN106907876A CN201710096111.0A CN201710096111A CN106907876A CN 106907876 A CN106907876 A CN 106907876A CN 201710096111 A CN201710096111 A CN 201710096111A CN 106907876 A CN106907876 A CN 106907876A
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CN
China
Prior art keywords
superheat
expansion valve
electric expansion
temperature
degree
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN201710096111.0A
Other languages
Chinese (zh)
Inventor
王威
许永锋
梁伯启
薛晓
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
Original Assignee
Midea Group Co Ltd
Guangdong Midea HVAC Equipment Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Midea Group Co Ltd, Guangdong Midea HVAC Equipment Co Ltd filed Critical Midea Group Co Ltd
Priority to CN201710096111.0A priority Critical patent/CN106907876A/en
Publication of CN106907876A publication Critical patent/CN106907876A/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B5/00Compression machines, plant, or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02Compression machines, plant, or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B41/00Fluid-circulation arrangements
    • F25B41/30Expansion means; Dispositions thereof
    • F25B41/31Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plant or systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/023Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233Compression machines, plant, or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2513Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2117Temperatures of an evaporator
    • F25B2700/21174Temperatures of an evaporator of the refrigerant at the inlet of the evaporator
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2117Temperatures of an evaporator
    • F25B2700/21175Temperatures of an evaporator of the refrigerant at the outlet of the evaporator
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The present invention discloses a kind of air-conditioning system, including being sequentially connected and form the compressor of refrigerant circulation circuit, outdoor heat exchanger and multiple indoor heat exchangers in parallel, indoor heat exchanger is provided with the first electric expansion valve near outdoor heat exchanger side, and indoor heat exchanger is provided with the second electric expansion valve near compressor side;Air-conditioning system also includes controller, controller when getting the actual degree of superheat of indoor heat exchanger and not waited with the default degree of superheat, according to the corresponding aperture for adjusting the first electric expansion valve of the difference between the actual degree of superheat and the default degree of superheat;And/or when the actual evaporation temperature of indoor heat exchanger and default evaporating temperature is not got not etc., according to the aperture of actual evaporation temperature the second electric expansion valve of regulation corresponding with the difference of default evaporating temperature.The invention also discloses a kind of evaporating temperature control method of air-conditioning system.The present invention can be independently controlled to the evaporating temperature of many indoor sets in parallel in air-conditioning system.

Description

Air-conditioning system and its evaporating temperature control method
Technical field
The present invention relates to refrigeration technology field, more particularly to a kind of air-conditioning system and its evaporating temperature control method.
Background technology
With the improvement of living standards, the humiture requirement more and more higher blown when user is freezed to air-conditioning system, this is just Need to be controlled the coolant quantity and evaporating temperature of indoor set.And the air-conditioning system used in parallel for many indoor sets, Traditional control method is by controlling every aperture of the electric expansion valve of indoor set porch, but going out due to each indoor set Mouth is joined directly together, therefore, the pressure in exit is identical, if ignoring the crushing inside indoor machine evaporation, between different indoor sets Evaporating pressure it is almost identical, also just cannot respectively control the evaporating temperature of each indoor set;In addition, changing in traditional control method The aperture of the electric expansion valve of indoor set porch can only then change the cold medium flux by correspondence indoor set, same uncontrollable The evaporating temperature of each indoor set.
The content of the invention
The main object of the present invention is to provide a kind of air-conditioning system and its evaporating temperature control method, it is intended to which each indoor set goes out Electric expansion valve is set up at mouthful, by controlling the aperture of the electric expansion valve at each indoor set import and export, with air-conditioning system The evaporating temperature of many indoor sets in parallel is independently controlled.
To achieve the above object, a kind of air-conditioning system proposed by the present invention, including be sequentially connected and form refrigerant circulation time The indoor heat exchanger of the compressor, outdoor heat exchanger and multiple parallel connections on road, the indoor heat exchanger is near the outdoor heat exchange Device side is provided with the first electric expansion valve, and the indoor heat exchanger is provided with the second electric expansion valve near the compressor side;It is described Air-conditioning system also includes controller, and the controller is getting the actual degree of superheat and the default degree of superheat of the indoor heat exchanger When not waiting, according to opening for corresponding regulation first electric expansion valve of the difference between the actual degree of superheat and the default degree of superheat Degree;And/or when the actual evaporation temperature of the indoor heat exchanger and default evaporating temperature is not got not etc., according to the reality The aperture of evaporating temperature regulation second electric expansion valve corresponding with the difference of default evaporating temperature.
Preferably, the air-conditioning system also includes the temperature sensor located at the indoor heat exchanger import and export position, with Detect the inlet temperature and outlet temperature of the indoor heat exchanger.
To achieve the above object, the present invention also provides a kind of evaporating temperature control method of air-conditioning system, including following step Suddenly:
Obtain the actual degree of superheat and/or actual evaporation temperature of indoor heat exchanger;
By obtain the actual degree of superheat be compared with the default degree of superheat, and/or will obtain actual evaporation temperature with it is pre- If evaporating temperature is compared;
When the actual degree of superheat is not waited with the default degree of superheat, according between the actual degree of superheat and the default degree of superheat Difference correspondence regulation the first electric expansion valve aperture;And/or in the actual evaporation temperature and default evaporating temperature When, according to the aperture of the actual evaporation temperature the second electric expansion valve of regulation corresponding with the difference of default evaporating temperature.
Preferably, the step of actual degree of superheat of the acquisition indoor heat exchanger includes:
Obtain the inlet temperature and outlet temperature of the indoor heat exchanger;
The difference between the outlet temperature and the inlet temperature is calculated, the actual overheat of the indoor heat exchanger is obtained Degree.
Preferably, it is described that the actual degree of superheat for obtaining is compared with the default degree of superheat, and/or the actual steaming that will be obtained Also include after the step of hair temperature is compared with default evaporating temperature:
When the actual degree of superheat is equal with the default degree of superheat, the current aperture of first electric expansion valve is kept not Become;And/or
When the actual evaporation temperature is equal with default evaporating temperature, the current of second electric expansion valve is kept to open Degree is constant.
Preferably, when the actual degree of superheat and the default degree of superheat are not waited, according to the actual degree of superheat with preset The aperture of difference correspondence the first electric expansion valve of regulation between temperature;And/or in the actual evaporation temperature and default evaporation When temperature is not waited, according to opening for the actual evaporation temperature the second electric expansion valve of regulation corresponding with the difference of default evaporating temperature The step of spending includes:
When the actual degree of superheat is not waited with the default degree of superheat, if between the actual degree of superheat and the default degree of superheat Difference is on the occasion of then corresponding to and tune up the aperture of first electric expansion valve;
If the difference of the actual evaporation temperature and default evaporating temperature is negative value, corresponding to turn first electronics down swollen The aperture of swollen valve;
And/or the actual evaporation temperature and default evaporating temperature not etc. when, if the actual evaporation temperature with it is default The difference of evaporating temperature is on the occasion of then corresponding to and tune up the aperture of second electric expansion valve;
If the difference of the actual evaporation temperature and default evaporating temperature is negative value, corresponding to turn second electronics down swollen The aperture of swollen valve.
Preferably, the step of the aperture of correspondence regulation first electric expansion valve and/or the second electric expansion valve it It is preceding also to include:
Judge whether first electric expansion valve and/or the current aperture of the second electric expansion valve are in maximum or minimum Aperture;
If it is not, then corresponding to the aperture of regulation first electric expansion valve and/or the second electric expansion valve.
Preferably, it is described to judge whether first electric expansion valve and/or the current aperture of the second electric expansion valve are located Also include after the step of maximum or minimum aperture:
If so, then keeping the current aperture of first electric expansion valve and/or the second electric expansion valve constant.
Preferably, the actual evaporation temperature is the inlet temperature of the indoor heat exchanger.
Preferably, the evaporating temperature control method of the air-conditioning system also includes:
When cold medium flux control instruction is got, if the current aperture of second electric expansion valve is opened in maximum Degree, then according to the actual degree of superheat of the indoor heat exchanger for obtaining, the aperture of correspondence regulation first electric expansion valve.
Air-conditioning system and its evaporating temperature control method that the present invention is provided, are close to by each described indoor heat exchanger The outdoor heat exchanger side is provided with the first electric expansion valve, is provided with the second electric expansion valve the compressor side is close to, and lead to Controller is crossed when getting the actual degree of superheat of indoor heat exchanger and not waited with the default degree of superheat, according to the actual degree of superheat with The aperture of difference correspondence regulation first electric expansion valve between the default degree of superheat;And/or changed the interior is got When the actual evaporation temperature of hot device and default evaporating temperature are not waited, according to the difference of the actual evaporation temperature and default evaporating temperature The aperture of value correspondence regulation second electric expansion valve.So, by the outlet of each indoor set in parallel in air-conditioning system Place sets up electric expansion valve, and controls the aperture of the electric expansion valve at each indoor set import and export, can not only control air-conditioning system Cold medium flux in system, can also be independently controlled to the evaporating temperature of many indoor sets in parallel in air-conditioning system, so that Meet under air-conditioning system refrigeration mode, user improves Consumer's Experience to the exact requirements of humiture.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is the structural representation of the embodiment of air-conditioning system of the present invention;
Fig. 2 is the schematic flow sheet of the evaporating temperature control method first embodiment of air-conditioning system of the present invention;
Fig. 3 is the schematic flow sheet of the evaporating temperature control method second embodiment of air-conditioning system of the present invention;
Fig. 4 is the schematic flow sheet of the evaporating temperature control method 3rd embodiment of air-conditioning system of the present invention;
Fig. 5 is the refinement schematic flow sheet of the actual degree of superheat of step acquisition indoor heat exchanger in Fig. 2;
Fig. 6 is the schematic flow sheet of the evaporating temperature control method fourth embodiment of air-conditioning system of the present invention;
Fig. 7 is the schematic flow sheet of the embodiment of evaporating temperature control method the 5th of air-conditioning system of the present invention;
Fig. 8 be in Fig. 2 or Fig. 6 step the actual degree of superheat and the default degree of superheat not etc. when, according to the actual mistake The refinement schematic flow sheet of the aperture of difference the first electric expansion valve of corresponding regulation between temperature and the default degree of superheat;
Fig. 9 be in Fig. 3 or Fig. 7 step the actual evaporation temperature and default evaporating temperature not etc. when, according to the reality The refinement schematic flow sheet of the aperture of border evaporating temperature the second electric expansion valve of regulation corresponding with the difference of default evaporating temperature;
Figure 10 is the schematic flow sheet of the evaporating temperature control method sixth embodiment of air-conditioning system of the present invention;
Figure 11 is the schematic flow sheet of the embodiment of evaporating temperature control method the 7th of air-conditioning system of the present invention;
Figure 12 is the schematic flow sheet of the embodiment of evaporating temperature control method the 8th of air-conditioning system of the present invention.
Drawing reference numeral explanation:
Label Title Label Title
1 Compressor 2 Outdoor heat exchanger
3 Indoor heat exchanger 4 First electric expansion valve
5 Second electric expansion valve 6 3rd electric expansion valve
7 4th electric expansion valve A1 First temperature sensor
A2 Second temperature sensor B1 Three-temperature sensor
B2 4th temperature sensor
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Base Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its His embodiment, belongs to the scope of protection of the invention.
If it is to be appreciated that be related in the embodiment of the present invention directionality indicate (such as up, down, left, right, before and after ...), It is only used for explaining relative position relation, motion conditions between each part under a certain particular pose (as shown in drawings) etc., If the particular pose changes, directionality indicates also correspondingly to change therewith.
If in addition, being related to the description of " first ", " second " etc. in the present invention, it is only used for describing purpose, and can not It is interpreted as indicating or implying its relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " the One ", at least one this feature can be expressed or be implicitly included to the feature of " second ".In addition, the skill between each embodiment Art scheme can be combined with each other, but must can be implemented as basis with those of ordinary skill in the art, when technical scheme With reference to occur it is conflicting or when cannot realize it will be understood that the combination of this technical scheme does not exist, also not in application claims Protection domain within.
Refer to Fig. 1, air-conditioning system provided by the present invention, including be sequentially connected and form the compression of refrigerant circulation circuit Machine 1, outdoor heat exchanger 2 and multiple indoor heat exchangers 3 in parallel.In this preferred embodiment, with 2 indoor heat exchangers of parallel connection A, B are illustrated, and the indoor heat exchanger A is provided with the first electric expansion valve 4 near the side of the outdoor heat exchanger 2, described Indoor heat exchanger is provided with the second electric expansion valve 5 near the side of the compressor 1.Similarly, the indoor heat exchanger B is near institute State the side of outdoor heat exchanger 2 and be provided with the 3rd electric expansion valve 6, the indoor heat exchanger is provided with the 4th electricity near the side of the compressor 1 Sub- expansion valve 7.Additionally, the air-conditioning system also includes the temperature sensor located at the indoor heat exchanger import and export position, tool Body ground, the indoor heat exchanger A is provided with the first temperature in its entrance location, namely between first electric expansion valve 4 Sensors A 1, in its outlet port, namely is provided with second temperature sensor A2 between second electric expansion valve 5;Together Sample ground, the indoor heat exchanger B is provided with the 3rd temperature in its entrance location, namely between the 3rd electric expansion valve 6 Sensor B1, in its outlet port, namely is provided with the 4th temperature sensor B2 between the 4th electric expansion valve 7.It is logical Cross inlet temperature TA1 and outlet temperature TA2 that A1, A2 detect the indoor heat exchanger A;The interior is detected by B1, B2 The inlet temperature TB1 and outlet temperature TB2 of heat exchanger B.
It is understood that in cooling mode, outdoor heat exchanger 2 is condenser, and indoor heat exchanger is evaporator; Under heating mode, outdoor heat exchanger 2 is evaporator, and indoor heat exchanger is condenser.Therefore, the present invention is mainly suitable in system Under chill formula, the evaporating temperature of indoor heat exchanger is adjusted.
On the premise of the internal pressure drops of indoor heat exchanger (evaporator) are ignored, evaporator inlet temperature is it is believed that approximate Equal to evaporating temperature, then TA1, TB1 are respectively indoor evaporator A, the evaporating temperature of indoor evaporator B, corresponding evaporator A, degree of superheat SH_A, SH_B of evaporator B can be represented with formula (1), (2):
SH_A=TA2-TA1 (1)
SH_B=TB2-TB1 (2).
The air-conditioning system also includes controller (not shown), and in the first embodiment, the controller is being obtained When not waited to the actual degree of superheat and the default degree of superheat of the indoor heat exchanger, according to the actual degree of superheat and the default degree of superheat Between difference correspondence regulation first electric expansion valve 4 aperture.
In a second embodiment, the controller is getting the actual evaporation temperature of the indoor heat exchanger and default steaming When hair temperature is not waited, according to actual evaporation temperature regulation second electronic expansion corresponding with the difference of default evaporating temperature The aperture of valve 5.
In the third embodiment, the controller is both getting the actual degree of superheat of indoor heat exchanger, also gets room During the actual evaporation temperature of interior heat exchanger, then respectively according to the difference between the actual degree of superheat and the default degree of superheat it is corresponding adjust The aperture of first electric expansion valve 4 is saved, while corresponding with the difference of default evaporating temperature according to the actual evaporation temperature Adjust the aperture of second electric expansion valve 5.
Above according to the specific of the first electric expansion valve 4 of difference correspondence regulation, the aperture of the second electric expansion valve 5 for obtaining Rule will be described below, and not repeat herein.
The air-conditioning system that the present invention is provided, sets by each described indoor heat exchanger near the side of the outdoor heat exchanger 2 There is the first electric expansion valve 4, be provided with the second electric expansion valve 5 the side of the compressor 1 is close to, and getting by controller When the actual degree of superheat of indoor heat exchanger is not waited with the default degree of superheat, according between the actual degree of superheat and the default degree of superheat The aperture of difference correspondence regulation first electric expansion valve 4;And/or getting the actual evaporation temperature of the indoor heat exchanger When degree is not waited with default evaporating temperature, described the is adjusted according to the actual evaporation temperature is corresponding with the difference of default evaporating temperature The aperture of two electric expansion valves 5.So, electronic expansion is set up by the exit of each indoor set in parallel in air-conditioning system Valve, and the aperture of electric expansion valve at each indoor set import and export is controlled, can not only control the refrigerant stream in air-conditioning system Amount, can also be independently controlled, to the evaporating temperature of many indoor sets in parallel in air-conditioning system so as to meet air-conditioning system Under refrigeration mode, user improves Consumer's Experience to the exact requirements of humiture.
The evaporating temperature control method that a kind of air-conditioning system is also provided of the invention, reference picture 2, in the first embodiment, institute The evaporating temperature control method for stating air-conditioning system is comprised the following steps:
Step S11, the actual degree of superheat for obtaining indoor heat exchanger;
In the present embodiment, as it appears from the above, indoor heat exchanger can be multiple parallel forms, it is to be understood that in refrigeration Under pattern, outdoor heat exchanger is condenser, and indoor heat exchanger is evaporator;In a heating mode, outdoor heat exchanger is evaporation Device, and indoor heat exchanger is condenser.Therefore, the present invention is mainly suitable in cooling mode, the steaming of indoor heat exchanger is adjusted Hair temperature.
The inlet temperature TA1 and outlet temperature TA2 of the indoor heat exchanger A are detected by A1, A2, is examined by B1, B2 Survey the inlet temperature TB1 and outlet temperature TB2 of the indoor heat exchanger B.
On the premise of the internal pressure drops of indoor heat exchanger (evaporator) are ignored, evaporator inlet temperature is it is believed that approximate Equal to evaporating temperature, then TA1, TB1 are respectively indoor evaporator A, the evaporating temperature of indoor evaporator B, corresponding evaporator A, degree of superheat SH_A, SH_B of evaporator B can be represented with formula (1), (2):
SH_A=TA2-TA1 (1)
SH_B=TB2-TB1 (2).
Step S12, by obtain the actual degree of superheat be compared with the default degree of superheat;
In the present embodiment, the actual degree of superheat can be calculated by above-mentioned formula, and the default degree of superheat can be according to steaming The size and actual operating mode situation of device are sent out, the default degree of superheat of acquiescence is set.
Step S13, the actual degree of superheat and the default degree of superheat not etc. when, according to the actual degree of superheat with preset The aperture of difference correspondence the first electric expansion valve of regulation between temperature.
In the present embodiment, when judging that the actual degree of superheat is not waited with the default degree of superheat, the calculating actual degree of superheat with it is pre- If the difference between the degree of superheat, and according to the positive and negative situation of the difference, the aperture of correspondence regulation first electric expansion valve.
Reference picture 3, in a second embodiment, the evaporating temperature control method of the air-conditioning system is comprised the following steps:
Step S21, the actual evaporation temperature for obtaining indoor heat exchanger;
In the present embodiment, on the premise of the internal pressure drops of indoor heat exchanger (evaporator) are ignored, evaporator inlet temperature I.e. it is believed that being approximately equal to evaporating temperature, then TA1, TB1 are respectively indoor evaporator A, the evaporating temperature of indoor evaporator B.
Step S22, the actual evaporation temperature of acquisition and default evaporating temperature are compared;
In the present embodiment, default evaporating temperature could be arranged to factory-default, it is also possible to according to the actual demand of user Rationally set or self-defined setting.
Step S23, the actual evaporation temperature and default evaporating temperature not etc. when, according to the actual evaporation temperature with The aperture of difference correspondence second electric expansion valve of regulation of default evaporating temperature.
In the present embodiment, when judging that actual evaporation temperature is not waited with default evaporating temperature, the actual evaporation temperature is calculated The difference with default evaporating temperature is spent, and according to the positive and negative situation of the difference, correspondence regulation second electric expansion valve Aperture.
Reference picture 4, in the third embodiment, the evaporating temperature control method of the air-conditioning system is comprised the following steps:
Step S31, the actual degree of superheat and actual evaporation temperature that obtain indoor heat exchanger;
Step S32, by obtain the actual degree of superheat be compared with the default degree of superheat, and will obtain actual evaporation temperature It is compared with default evaporating temperature;
In the present embodiment, when the actual degree of superheat and actual evaporation temperature of indoor heat exchanger is got, then will obtain respectively The actual degree of superheat for taking is compared with the default degree of superheat, while the actual evaporation temperature of acquisition and default evaporating temperature are carried out Compare.
Step S33, the actual degree of superheat and the default degree of superheat not etc. when, according to the actual degree of superheat with preset The aperture of difference correspondence the first electric expansion valve of regulation between temperature;Meanwhile, in the actual evaporation temperature and default evaporation When temperature is not waited, according to opening for the actual evaporation temperature the second electric expansion valve of regulation corresponding with the difference of default evaporating temperature Degree.
In the present embodiment, when judging that the actual degree of superheat is not waited with the default degree of superheat, the calculating actual degree of superheat with it is pre- If the difference between the degree of superheat, and according to the positive and negative situation of the difference, the aperture of correspondence regulation first electric expansion valve; Simultaneously when judging that actual evaporation temperature is not waited with default evaporating temperature, the actual evaporation temperature and default evaporating temperature are calculated Difference, and according to the positive and negative situation of the difference, the aperture of correspondence regulation second electric expansion valve.
The evaporating temperature control method of the air-conditioning system that the present invention is provided, by the actual degree of superheat for obtaining indoor heat exchanger And/or actual evaporation temperature, then the actual degree of superheat for obtaining is compared with the default degree of superheat, and/or the reality that will be obtained Border evaporating temperature is compared with default evaporating temperature, when the actual degree of superheat is not waited with the default degree of superheat, according to described The aperture of difference the first electric expansion valve of corresponding regulation between the actual degree of superheat and the default degree of superheat, and/or in the reality When evaporating temperature is not waited with default evaporating temperature, according to actual evaporation temperature regulation corresponding with the difference of default evaporating temperature The aperture of the second electric expansion valve.So, by control air-conditioning system indoor set each in parallel import and export at electronics it is swollen The aperture of swollen valve, can not only control the cold medium flux in air-conditioning system, can also be to many interiors in parallel in air-conditioning system The evaporating temperature of machine is independently controlled, and so as to meet under air-conditioning system refrigeration mode, user enters to the exact requirements of humiture And improve Consumer's Experience.
In one embodiment, reference picture 5, on the basis of the embodiment shown in Fig. 2, the step S11 includes:
Step S111, the inlet temperature and outlet temperature that obtain the indoor heat exchanger;
In the present embodiment, by taking indoor heat exchanger (evaporator) A as an example, evaporator A is obtained by the first temperature sensor A1 Inlet temperature TA1, and the outlet temperature TA2 that evaporator A is obtained by second temperature sensor A2.
Difference between step S112, the calculating outlet temperature and the inlet temperature, obtains the indoor heat exchanger The actual degree of superheat.
In the present embodiment, the difference between the calculating outlet temperature and the inlet temperature, namely SH_A=TA2- TA1, you can obtain the actual degree of superheat of the indoor heat exchanger.
In one embodiment, reference picture 6, on the basis of Fig. 2 embodiments, also include after the step S12:
Step S41, when the actual degree of superheat is equal with the default degree of superheat, kept for working as first electric expansion valve Preceding aperture is constant;
In the present embodiment, when judging that the actual degree of superheat is equal with the default degree of superheat, show current evaporator mistake Temperature meets user's request, therefore, it can keep the current aperture of first electric expansion valve constant.
Reference picture 7, on the basis of Fig. 3 embodiments, also includes after the step S22:
Step S42, when the actual evaporation temperature is equal with default evaporating temperature, keep second electric expansion valve Current aperture it is constant.
In the present embodiment, when judging that the actual evaporation temperature is equal with default evaporating temperature, show current evaporation The evaporating temperature of device meets user's request, therefore, it can keep the current aperture of second electric expansion valve constant.
Similarly, step S41 and step S42 can also simultaneously be performed after the step S32.
In one embodiment, reference picture 8, on the basis of the embodiment shown in Fig. 2 or Fig. 6, the step S13 includes:
Step S131, the actual degree of superheat and the default degree of superheat not etc. when, if the actual degree of superheat with preset Difference between temperature is on the occasion of then corresponding to and tune up the aperture of first electric expansion valve;
In the present embodiment, when judging that the actual degree of superheat SH_A and default degree of superheat SHS is not waited, if the actual mistake Difference between temperature and the default degree of superheat is on the occasion of namely in SH_A > SHS, correspondence tunes up first electric expansion valve Aperture.
If step S132, the actual evaporation temperature are negative value with the difference of default evaporating temperature, correspond to described in turning down The aperture of the first electric expansion valve.
In the present embodiment, judging that actual evaporation temperature is negative value with the difference of default evaporating temperature, namely in SH_A < During SHS, correspondence tunes up the aperture of first electric expansion valve.
In one embodiment, reference picture 9, on the basis of the embodiment shown in Fig. 3 or Fig. 7, the step S23 includes:
Step S231, the actual evaporation temperature and default evaporating temperature not etc. when, if the actual evaporation temperature with The difference of default evaporating temperature is on the occasion of then corresponding to the aperture for tuning up second electric expansion valve;
In the present embodiment, when judging that actual evaporation temperature is not waited with default evaporating temperature, if the actual evaporation temperature It is on the occasion of namely in TA1 > Te_A, then corresponding to and tune up opening for second electric expansion valve with the difference of default evaporating temperature Degree.
When actual evaporation temperature is more than setting evaporating temperature, the aperture of the second electric expansion valve is tuned up, refrigerant is by the Smaller pressure drop can be produced after two electric expansion valves, and the evaporating pressure inside corresponding evaporator A will decline, and cause evaporation temperature Degree A1 declines, so as to reach the purpose of regulation evaporating temperature.
If step S233, the actual evaporation temperature are negative value with the difference of default evaporating temperature, correspond to described in turning down The aperture of the second electric expansion valve.
In the present embodiment, when judging that actual evaporation temperature is not waited with default evaporating temperature, if the actual evaporation temperature Difference with default evaporating temperature is negative value, namely in TA1 < Te_A, then corresponds to and turn opening for second electric expansion valve down Degree.
When actual evaporation temperature is less than setting evaporating temperature, the aperture of the second electric expansion valve is turned down, refrigerant is by the Bigger pressure drop can be produced after two electric expansion valves, and the evaporating pressure inside corresponding evaporator A will rise, and cause evaporation temperature Degree A1 rises, so as to reach the purpose of regulation evaporating temperature.
In the first embodiment, reference picture 10, on the basis of the embodiment shown in Fig. 2 or Fig. 6, the step S13 it It is preceding also to include:
Step S14, judge the current aperture of first electric expansion valve whether in maximum or minimum aperture;
In the present embodiment, when the actual degree of superheat is not waited with the default degree of superheat, working as first electric expansion valve is judged Whether preceding aperture reaches capacity aperture, namely in maximum or minimum aperture.
Step S15, if it is not, then corresponding to the aperture of regulation first electric expansion valve.
In the present embodiment, if it is determined that the current aperture of first electric expansion valve is not reaching to limit aperture, namely place Between minimum aperture and maximum opening, then the aperture of regulation first electric expansion valve is corresponded to.
Step S16, if so, then keeping the current aperture of first electric expansion valve constant.
In the present embodiment, the aperture if it is determined that the current aperture of first electric expansion valve reaches capacity, namely current place In minimum aperture or maximum opening, now, show that current working is not suitable for being adjusted the aperture of electric expansion valve, if continuing Regulation, then can damage valve body and reduce the valve body life-span, accordingly, it is therefore desirable to maintain the current aperture of first electric expansion valve is not Become.
In a second embodiment, reference picture 11, on the basis of the embodiment shown in Fig. 3 or Fig. 7, the step S23 it It is preceding also to include:
Step S24, judge the current aperture of second electric expansion valve whether in maximum or minimum aperture;
In the present embodiment, when actual evaporation temperature is not waited with default evaporating temperature, second electric expansion valve is judged Current aperture whether reach capacity aperture, namely in maximum or minimum aperture.
Step S25, if it is not, then corresponding to the aperture of regulation second electric expansion valve.
In the present embodiment, if it is determined that the current aperture of second electric expansion valve is not reaching to limit aperture, namely place Between minimum aperture and maximum opening, then the aperture of regulation second electric expansion valve is corresponded to.
Step S26, if so, then keeping the current aperture of second electric expansion valve constant.
In the present embodiment, the aperture if it is determined that the current aperture of second electric expansion valve reaches capacity, namely current place In minimum aperture or maximum opening, now, show that current working is not suitable for being adjusted the aperture of electric expansion valve, if continuing Regulation, then can damage valve body and reduce the valve body life-span, accordingly, it is therefore desirable to maintain the current aperture of second electric expansion valve is not Become.
In one embodiment, reference picture 12, on the basis of the embodiment shown in Fig. 2, also include before the step S11:
Step S10, when cold medium flux control instruction is got, if the current aperture of second electric expansion valve is in Maximum opening, then according to the actual degree of superheat of the indoor heat exchanger for obtaining, correspondence regulation first electric expansion valve Aperture.
In the present embodiment, when evaporating temperature is freely adjusted, the second electric expansion valve is opened to maximum opening, now, One electric expansion valve carries out aperture regulation according to degree of superheat SH_A, the so i.e. adjustable cold medium flux for passing through indoor evaporator A. Certainly, now, each evaporator, such as evaporating temperature TA1, TB1 in A, B are always approximately the same.By taking indoor evaporator A as an example, If now operating mode residing for indoor evaporator A changes or user's request changes, evaporating temperature of the user to evaporator A Set, now, then need to adjust the aperture of the second electric expansion valve, namely perform follow-up step.
The preferred embodiments of the present invention are the foregoing is only, the scope of the claims of the invention is not thereby limited, it is every at this Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/use indirectly It is included in scope of patent protection of the invention in other related technical fields.

Claims (10)

1. a kind of air-conditioning system, including be sequentially connected and form compressor, outdoor heat exchanger and the multiple of refrigerant circulation circuit Indoor heat exchanger in parallel, it is characterised in that it is swollen that the indoor heat exchanger is provided with the first electronics near the outdoor heat exchanger side Swollen valve, the indoor heat exchanger is provided with the second electric expansion valve near the compressor side;The air-conditioning system also includes control Device, the controller when getting the actual degree of superheat of the indoor heat exchanger and not waited with the default degree of superheat, according to the reality The aperture of corresponding regulation first electric expansion valve of difference between the border degree of superheat and the default degree of superheat;And/or getting When the actual evaporation temperature of the indoor heat exchanger is not waited with default evaporating temperature, according to the actual evaporation temperature and default steaming Send out the aperture of difference correspondence regulation second electric expansion valve of temperature.
2. air-conditioning system as claimed in claim 1, it is characterised in that the air-conditioning system also includes being located at the indoor heat exchange The temperature sensor of device import and export position, to detect the inlet temperature and outlet temperature of the indoor heat exchanger.
3. the evaporating temperature control method of a kind of air-conditioning system, it is characterised in that comprise the following steps:
Obtain the actual degree of superheat and/or actual evaporation temperature of indoor heat exchanger;
By obtain the actual degree of superheat be compared with the default degree of superheat, and/or by obtain actual evaporation temperature and default steaming Hair temperature is compared;
When the actual degree of superheat is not waited with the default degree of superheat, according to the difference between the actual degree of superheat and the default degree of superheat The aperture of value correspondence the first electric expansion valve of regulation;And/or the actual evaporation temperature and default evaporating temperature not etc. when, root According to the aperture of the actual evaporation temperature the second electric expansion valve of regulation corresponding with the difference of default evaporating temperature.
4. the evaporating temperature control method of air-conditioning system as claimed in claim 3, it is characterised in that the acquisition interior heat exchange The step of actual degree of superheat of device, includes:
Obtain the inlet temperature and outlet temperature of the indoor heat exchanger;
The difference between the outlet temperature and the inlet temperature is calculated, the actual degree of superheat of the indoor heat exchanger is obtained.
5. the evaporating temperature control method of the air-conditioning system as described in claim 3 or 4, it is characterised in that described to obtain The actual degree of superheat is compared with the default degree of superheat, and/or the actual evaporation temperature of acquisition and default evaporating temperature are compared Compared with the step of after also include:
When the actual degree of superheat is equal with the default degree of superheat, keep the current aperture of first electric expansion valve constant; And/or
When the actual evaporation temperature is equal with default evaporating temperature, the current aperture of second electric expansion valve is kept not Become.
6. the evaporating temperature control method of air-conditioning system as claimed in claim 3, it is characterised in that in the actual degree of superheat It is swollen according to the first electronics of corresponding regulation of the difference between the actual degree of superheat and the default degree of superheat when not waited with the default degree of superheat The aperture of swollen valve;And/or the actual evaporation temperature and default evaporating temperature not etc. when, according to the actual evaporation temperature with The step of aperture of difference correspondence second electric expansion valve of regulation of default evaporating temperature, includes:
When the actual degree of superheat is not waited with the default degree of superheat, if the difference between the actual degree of superheat and the default degree of superheat It is on the occasion of then corresponding to and tune up the aperture of first electric expansion valve;
If the actual evaporation temperature is negative value with the difference of default evaporating temperature, corresponding to turn first electric expansion valve down Aperture;
And/or the actual evaporation temperature and default evaporating temperature not etc. when, if the actual evaporation temperature and default evaporation The difference of temperature is on the occasion of then corresponding to and tune up the aperture of second electric expansion valve;
If the actual evaporation temperature is negative value with the difference of default evaporating temperature, corresponding to turn second electric expansion valve down Aperture.
7. the evaporating temperature control method of air-conditioning system as claimed in claim 3, it is characterised in that in correspondence regulation described the Also include before the step of aperture of one electric expansion valve and/or the second electric expansion valve:
Judge whether first electric expansion valve and/or the current aperture of the second electric expansion valve are opened in maximum or minimum Degree;
If it is not, then corresponding to the aperture of regulation first electric expansion valve and/or the second electric expansion valve.
8. the evaporating temperature control method of air-conditioning system as claimed in claim 7, it is characterised in that the judgement described first Also wrapped after the step of whether current aperture of electric expansion valve and/or the second electric expansion valve is in maximum or minimum aperture Include:
If so, then keeping the current aperture of first electric expansion valve and/or the second electric expansion valve constant.
9. the evaporating temperature control method of air-conditioning system as claimed in claim 3, it is characterised in that the actual evaporation temperature It is the inlet temperature of the indoor heat exchanger.
10. the evaporating temperature control method of air-conditioning system as claimed in claim 3, it is characterised in that the air-conditioning system Evaporating temperature control method also includes:
When cold medium flux control instruction is got, if the current aperture of second electric expansion valve is in maximum opening, According to the actual degree of superheat of the indoor heat exchanger for obtaining, the aperture of correspondence regulation first electric expansion valve.
CN201710096111.0A 2017-02-21 2017-02-21 Air-conditioning system and its evaporating temperature control method Withdrawn CN106907876A (en)

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CN107477780A (en) * 2017-08-14 2017-12-15 珠海格力电器股份有限公司 For the method and air-conditioning of the evaporating temperature for adjusting indoor apparatus of air conditioner
CN107940827A (en) * 2017-11-10 2018-04-20 广东美的暖通设备有限公司 Multi-line system and its refrigerant distribution control method and device
CN107975916A (en) * 2017-11-13 2018-05-01 珠海格力电器股份有限公司 Air conditioner system control method, apparatus and system
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CN112254292A (en) * 2020-09-22 2021-01-22 青岛海尔空调器有限总公司 Method and device for controlling double-evaporator air conditioning system and air conditioner
CN112396763A (en) * 2020-11-11 2021-02-23 清华大学 Household metering and charging method and device for multi-split air conditioner
CN112556259A (en) * 2020-12-14 2021-03-26 珠海格力电器股份有限公司 Pressure regulation control method and device and air conditioner
CN112665254A (en) * 2020-12-28 2021-04-16 江苏拓米洛环境试验设备有限公司 Control method and device for multi-chamber electronic expansion valve of refrigeration system and refrigeration system
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Application publication date: 20170630