CN1071882C - Refrigerant circulating arrangement - Google Patents
Refrigerant circulating arrangement Download PDFInfo
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- CN1071882C CN1071882C CN93119985A CN93119985A CN1071882C CN 1071882 C CN1071882 C CN 1071882C CN 93119985 A CN93119985 A CN 93119985A CN 93119985 A CN93119985 A CN 93119985A CN 1071882 C CN1071882 C CN 1071882C
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- 239000003507 refrigerant Substances 0.000 title abstract description 16
- 238000007710 freezing Methods 0.000 claims description 14
- 230000008014 freezing Effects 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 11
- 230000003247 decreasing effect Effects 0.000 abstract 4
- 230000001276 controlling effect Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 11
- 238000010792 warming Methods 0.000 description 9
- 230000006870 function Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000010926 purge Methods 0.000 description 2
- 230000000306 recurrent effect Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
- F25B41/35—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators by rotary motors, e.g. by stepping motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2341/00—Details of ejectors not being used as compression device; Details of flow restrictors or expansion valves
- F25B2341/06—Details of flow restrictors or expansion valves
- F25B2341/068—Expansion valves combined with a sensor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/15—Hunting, i.e. oscillation of controlled refrigeration variables reaching undesirable values
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/21—Refrigerant outlet evaporator temperature
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
To rapidly converge a degree of superheat to a set value and afford stable operation at all times by correcting opening degree control values for electronic expansion valves in a manner to make the same decreasing when a decreasing variation of a maximum value of a difference between the set value and the degree of overheat is not more than a set value and this is successively satisfied a predetermined times. A difference between a set value and a degree of super heat, and a maximum value of the difference are successively detected. When a variation detected is not more than a set value, for example, 2 deg.C and a maximum value at that time is not less than a predetermined value, for example, 1 deg.C, a gain G is decreased a predetermined value, for example, 0.3 at a point of time when a number of times reaches a set value, for example 2. An opening degree control value for electronic expansion valves 11, 21 is corrected to be decreased, and a flow rate of a refrigerant flowing to an evaporator becomes small in variation. Therefore, an amplitude variation of the degree of overheat is suppressed, and the degree of overheat can be made to rapidly tend to the set value. Accordingly, it is possible to perform stable operation at all times.
Description
Involved in the present invention is the freezing cycle device that is used for air conditioner.
Air conditioner is made up of the refrigerating circulation system that compressor, outdoor heat converter, pressure reducer, indoor heat converter are formed by connecting.If the cold-producing medium that allows compressor discharge flows through outdoor heat converter, pressure reducer and indoor heat converter successively, make outdoor heat converter play condenser, indoor heat converter plays evaporimeter, then carries out cooling operation.Compressor cross valve, outdoor heat converter, pressure reducer, indoor heat converter are coupled together, constitute the refrigerating circulation system of heat-pump-type, by switching cross valve, the flow direction of the flow direction that makes cold-producing medium during with cooling operation is opposite, allow indoor heat converter play condenser, outdoor heat converter plays evaporimeter, then carries out warming operation.
In addition, under the variable situation of compressor capacity, detect air conditioner load, and control the capacity of compressor, just can obtain and corresponding best refrigerating capacity of air conditioner load and heating capacity according to this air conditioner load according to indoor temperature.
But when above-mentioned capacity was controlled, owing to the variation along with capacity, the flow of cold-producing medium also can change, thereby the degree of superheat of the cold-producing medium in the evaporimeter is changed.In order to ensure stable running, the above-mentioned degree of superheat must be remained on certain numerical value.Therefore, adopt electric expansion valve,, the degree of superheat is remained on certain numerical value (that is setting value) by the aperture of control electric expansion valve as pressure reducer.
The Japan Patent spy opens clear 60-263065 and discloses a kind of air conditioner that adopts this degree of superheat control.
Yet the concrete grammar of the control degree of superheat that above-mentioned patent adopted is feedback and fuzzy control method.When adopting FEEDBACK CONTROL, detect the degree of superheat in the freeze cycle, its feedback is sent back to the PID controller.The PID controller calculates the operating value to electronic expansion valve opening according to the deviation between the degree of superheat and the setting value, is used to regulate the aperture to electric expansion valve.
In case the aperture to electric expansion valve is regulated, the refrigerant flow that flows to indoor heat converter is changed, and then the degree of superheat is changed.Yet, be adjusted to and make the degree of superheat temporal delay that changed from carrying out aperture.Under the influence of this time delay, the degree of superheat can just not converge to setting value at once, is center recurrent fluctuations up and down with the setting value but make its amplitude, converges on setting value gradually.
Adopt FEEDBACK CONTROL and fuzzy control can only make the amplitude variations of degree of superheat SH trend towards convergence to a certain extent,, just be not easy to realize convergence sometimes if bigger variation appears in air conditioner load.Under some loading condiction, not only can not realize convergence, can produce on the contrary and disperse phenomenon, perhaps finally be stabilized on a certain numerical value that departs from setting value.Its fundamental cause is that the setting value of this PID control and fuzzy control is constant, yet for the very big process of this load variations of kind of refrigeration cycle, wanting to set very, the constant set value is very difficult.
The present invention has considered the problems referred to above, and its objective is provides a kind of refrigerating circulatory device, and it can make the degree of superheat promptly converge on setting value, thereby realizes stable running.
The described freezing cycle device of claim 1 has the cooling cycle system that is formed by connecting by compressor, condenser, electric expansion valve, evaporimeter, and the aperture by the control electric expansion valve makes the degree of superheat of the cold-producing medium in the evaporimeter reach set-point.This device has: first checkout equipment is used for detecting one by one the maximum of the difference between the above-mentioned setting value and the degree of superheat; Second checkout equipment is used to detect the maximum that is obtained with above-mentioned first checkout equipment and is reducing the variable quantity of direction; Judgment device is used to judge that whether the variable quantity that is obtained by above-mentioned second checkout equipment is less than above-mentioned setting value; Compensation equipment is used for when the judgement of certain number of times is satisfied above-mentioned decision condition constantly, towards the aperture controlling value of the above-mentioned electric expansion valve of adjustment in direction that reduces.
The described freezing cycle device of claim 2 has the cooling cycle system that is formed by connecting by compressor, condenser, electric expansion valve, evaporimeter, and the aperture by the control electric expansion valve makes the degree of superheat of the cold-producing medium in the evaporimeter reach setting value.This device has: first checkout equipment is used for detecting one by one the maximum of the difference between the above-mentioned setting value and the degree of superheat; Second checkout equipment is used to detect the maximum that is obtained with above-mentioned first checkout equipment and is reducing the variable quantity of direction; First judgment device is used to judge that whether the variable quantity that is obtained by above-mentioned second checkout equipment is less than above-mentioned setting value; First compensation equipment is used for when the judgement of certain number of times is satisfied above-mentioned decision condition constantly, towards the opening value of the above-mentioned electric expansion valve of adjustment in direction that reduces; Second judgment device, be used to judge the difference that obtained with above-mentioned first checkout equipment whether in the regular hour constantly greater than set-point; Second compensation equipment is used for when meeting the decision condition of above-mentioned second judgment device towards the aperture controlling value of the above-mentioned electric expansion valve of adjustment in direction that increases.
Freezing cycle device as claimed in claim 3 further comprises on the basis of the described device of claim 2: the 3rd checkout equipment, be used for when the operating frequency of above-mentioned compressor changes, detect the variable quantity of the degree of superheat, that is maximum that is obtained with above-mentioned first checkout equipment and poor through between the difference detected after the regular hour; Prediction equipment is used for predicting that according to the variable quantity of the above-mentioned degree of superheat and with the difference that first checkout equipment is obtained the degree of superheat arrives the needed time of setting value; The 3rd compensation equipment is used for time when above-mentioned prediction during greater than set-point, towards the aperture controlling value of the above-mentioned electric expansion valve of adjustment in direction that increases, when time of prediction during less than set-point, towards the aperture controlling value of the above-mentioned electric expansion valve of adjustment in direction that reduces.
Below with reference to accompanying drawing two kinds of embodiments of the present invention are described.
Accompanying drawing 1 is the refrigerating circulation system structure chart of first embodiment of the invention;
Accompanying drawing 2 is control circuit figure that first embodiment is adopted;
Accompanying drawing 3 is block diagrams that the FEEDBACK CONTROL among first embodiment is described;
Accompanying drawing 5 is flow charts that the working method to first embodiment describes;
Accompanying drawing 6 is flow charts that the working method to first embodiment describes;
Accompanying drawing 7 is flow charts that the working method to the second embodiment of the present invention describes;
Accompanying drawing 8 is flow charts that the working method to second embodiment describes;
Accompanying drawing 9 is flow charts that the working method to second embodiment describes;
Accompanying drawing 10 is flow charts that the working method to second embodiment describes;
Accompanying drawing 11 is the schematic diagrames that concern between the variation of degree of superheat SH among second embodiment and the predicted time T4.
In accompanying drawing 1, A is an outdoor unit, and B1 and B2 are indoor units, and they have constituted following refrigerating circulation system.
The delivery outlet of compressor 1 is connected with outdoor heat converter 3 by cross valve 2, and this outdoor heat converter 3 has the liquid side and is responsible for W, and this liquid side is responsible for W and is divided into liquid side branch W1 and W2, and they are connected with indoor heat converter 12,22 respectively.
Near indoor heat converter 12,22, indoor fan 13 and 23 have been installed, heat-exchanger temperature sensor 14 has been installed on indoor heat converter 12, heat-exchanger temperature sensor 24 has been installed on than parallel operation 22 in indoor heat.On gas side branch G1, refrigerant temperature sensors 15 is housed.On gas side branch G2, refrigerant temperature sensors 25 is housed.
Accompanying drawing 2 has shown control circuit.
Electric main power supply 30 is connected with the outdoor controller 40 of outdoor unit A, this outdoor controller is made of microcomputer and peripheral circuit, and it is connected with PMV11 and 21, two-way valve 6, cross valve 2, outdoor fan motor 4M, refrigerant temperature sensors 7,8,15,25 and converter circuit 41.
The voltage of 41 pairs of power supplys 30 of converter circuit carries out rectification, converts thereof into according to the instruction of outdoor controller 40 to be frequency and level voltage, and is exported.The voltage of output becomes the driving voltage of compressor electric motor 1M.
Indoor unit B1 and B2 have indoor controller 50 respectively, and it is made of microcomputer and peripheral circuit.Above-mentioned indoor controller 50 is connected with indoor temperature transmitter 51, heat-exchanger temperature sensor 14 (and 24), distance type operator 52, indoor fan motor 13M (and 23M).
Above-mentioned indoor controller 50 and outdoor controller 40 are connected to power line ACL respectively and are used to transmit the serial signal line SL of data.
Each indoor controller 50 all has following function:
1,, service condition (the temperature value Ts that comprises setting) is flowed to outdoor controller 40 in the mode with the serial signal of supply voltage synchronised according to the operation of distance type operator 52;
2, detect difference between the temperature value Ts that temperature signal Ta that the indoor temperature transmitter 51 as the air conditioner load value produced and distance type operator 52 set, will flow to outdoor controller 40 in mode corresponding to the ability (frequency values) that requires of above-mentioned air conditioner load value with the serial signal of supply voltage synchronised;
3, the detected temperature value Ta of temperature value Tc that heat-exchanger temperature sensor 14 (and 24) is detected and indoor temperature transmitter 51 flows to outdoor controller 40 in the mode with the serial signal of supply voltage synchronised.
1, according to the cooling operation mode instruction that is produced by each indoor controller 50, the cold-producing medium that compressor 1 is discharged passes through cross valve 2, outdoor heat converter 3, PMV11 and 21, indoor heat converter 12 and 22, cross valve 2, send back to compressor 1 again, carry out cooling operation;
2, switch cross valve 2 according to the warming operation mode instruction that is produced by each indoor controller 50, the cold-producing medium that compressor 1 is discharged passes through cross valve 2, indoor heat converter 12 and 22, PMV11 and 21, outdoor heat converter 3, cross valve 2, send compressor 1 again back to, carry out warming operation;
3, freezing and during warming operation, the summation that requires ability that is produced according to each indoor controller 50 is controlled the operating frequency F (equaling the output frequency of converter circuit 41) of compressor 1.
4, when carrying out cooling operation, detect the difference (being Tg-Tc) between the temperature value Tc of the temperature value T g of refrigerant temperature sensors 15 and heat-exchanger temperature sensor 14, refrigerant superheat degree SH as indoor heat converter 12, detect the difference between the temperature value Tc of the temperature value Tg of refrigerant temperature sensors 25 and heat-exchanger temperature sensor 24, as the refrigerant superheat degree SH of indoor heat converter 22;
5, when carrying out cooling operation, the aperture of PMV11 and 21 is controlled, make above-mentioned detected degree of superheat SH trend towards setting value SHs;
6, when carrying out warming operation, detect the difference (being Te-Ts) between the temperature value Ts of the temperature value Te of heat-exchanger temperature sensor 7 and refrigerant temperature sensors 8, as the refrigerant superheat degree SH of outdoor heat converter 3;
7, when carrying out warming operation,, as setting value SHS the aperture of PMV11 and 21 is controlled with above-mentioned detected degree of superheat SH, make above-mentioned detected degree of superheat SH trend towards setting value SHs.
8, when carrying out warming operation, open two-way valve 6 termly, outdoor heat converter 3 is carried out defrost operation, in case two-way valve 6 is opened, the high temperature refrigerant of being discharged by compressor 1 will be injected in the outdoor heat converter 3;
9, freezing and during warming operation, adopt first checkout equipment detect one by one between setting value SHs and the degree of superheat SH difference △ SH with and maximum △ SHmax, the last look of the maximum △ SHmax that will go out with this Equipment Inspection is stored as △ SHmax (N), and previous maximum is stored as △ SHmax (N-1);
10, adopt second checkout equipment to detect maximum △ SHmax that above-mentioned usefulness first checkout equipment obtained and reduce variable quantity on the direction at it, so-called be meant at △ SHmax (N) during the difference of above-mentioned two amounts (being △ SHmax (N-1)-△ SHmax (N)) reducing variable quantity on the direction greater than △ SHmax (N-1);
11, adopt first judgment device whether to judge with the detected variable quantity of second checkout equipment less than set-point (for example 2 ℃), and with the detected maximum △ SHmax of second checkout equipment whether greater than set-point (for example 1 ℃);
If 12 results that obtained in continuous several times (for example twice) are judged with first judgment device satisfy above-mentioned decision condition, the aperture controlling value that then adopts the first compensation equipment PMV is towards the adjustment in direction that reduces;
13, adopt second judgment device judge with the detected difference △ SH of first checkout equipment whether in certain hour (for example 5 minutes) constantly greater than set-point (for example 1 ℃);
If 14 satisfy the decision condition of second judgment device, then adopt second compensation equipment with the aperture controlling value of PMV towards the adjustment in direction that increases.
Below working method of the present invention is described.
When Working mode set being refrigeration mode by distance type operator 52, the cold-producing medium that compressor 1 is discharged direction shown in the solid arrow in the accompanying drawing 1 flows, outdoor heat converter 3 plays condenser, and indoor heat converter 12 and 22 plays evaporimeter, so just carries out cooling operation.
When freezing, the operating frequency F (that is output frequency of converter circuit 41) to compressor 1 controls according to the summation that requires ability of indoor unit B1 and B2.Simultaneously, detect the superheat value SH of the cold-producing medium in indoor heat converter 12 and 22, the aperture of PMV11 and 21 is controlled, make above-mentioned degree of superheat SH trend towards setting value SHs.
When Working mode set being heating mode by distance type operator 52, the cold-producing medium that compressor 1 is discharged direction shown in the dotted arrow in the accompanying drawing 1 flows, indoor heat converter 12 and 22 plays condenser, and outdoor heat converter 3 plays evaporimeter, so just carries out warming operation.
When heating, the operating frequency F (that is converter circuit 41 people's output frequencies) to compressor 1 controls according to the summation that requires ability of indoor unit B1 and B2.Simultaneously, detect the degree of superheat SH of the cold-producing medium in the outdoor heat converter 3, the aperture of PMV11 and 21 is controlled, make degree of superheat SH trend towards setting value SHs.By above-mentioned aperture control, make the cold-producing medium of suitable flow flow through indoor heat converter 12 and 22 respectively.
Refrigeration and the control of the degree of superheat when warm are what to carry out with the feedback controling mode shown in the accompanying drawing 3.
In kind of refrigeration cycle, detect degree of superheat SH, it is fed back to the PID controller.To set value SHs and deliver to the PID controller, calculate operational ton (being number of drive pulses) PMV11 and 21 according to the difference between setting value SHs and the degree of superheat SH.This operational ton is carried out the correction of gain G, adopt revised operational ton to control the aperture of PMV11 and 21.
Detected degree of superheat SH is delivered to yield value G determining device, monitor the convergence situation of degree of superheat SH, and set yield value G according to this convergence situation with respect to setting value SHs with this determining device.
Illustrate how to monitor degree of superheat SH and set yield value G below in conjunction with Fig. 4, Fig. 5 and 6.
When entry into service, when the operating number of indoor unit B1 and B2 changes, PMV11 and 21 is carried out the initial stage aperture when setting, when perhaps carrying out defrost operation (step 101,102,103,104), removing is stored in △ SHmax (N), △ SHmax (N-1), number of times counter value N and the time counter value T in the memory, and yield value G is set at " 1 " (step 105).Yield value G is set at " 1 " just means and do not compensate that former state is fixedly controlled aperture with the operational ton that the PID controller is produced.
In case the aperture to PMV11 and 21 is regulated, the refrigerant flow that flows to evaporimeter is changed, and then degree of superheat SH is changed.Yet, be adjusted to and make the degree of superheat temporal delay that changed from beginning to carry out aperture.Under the influence of this time delay, degree of superheat SH can just not converge to setting value at once, is center recurrent fluctuations up and down, convergence gradually with the setting value but make its amplitude.In addition, control modes such as employing PID control can only suppress the amplitude variations of degree of superheat SH to a certain extent, if bigger variation appears in air conditioner load, just are not easy to realize convergence sometimes.Under some loading condiction, not only can not realize convergence, can produce on the contrary and disperse phenomenon, degree of superheat SH is stabilized in depart from a certain numerical value of setting value.
After the running beginning, when the operating number of indoor unit B1 and B2 no longer changes, PMV no longer is in the initial stage aperture assignment procedure, nor when carrying out defrost operation (step 101,102,103,104), detect degree of superheat SH, setting value SHs and the difference △ SH between the degree of superheat SH and the maximum △ SHmax (step 106) of this difference in the evaporimeter one by one.Meanwhile, characteristic value H is set at " O " (step 107).
Whether judge difference △ SH greater than set-point (step 108), for example 1 ℃.When difference △ SH greater than 1 ℃ (YES in the step 108), and when not changing operating frequency F (YES in the step 110), be (NO in the step 113), then time started numeration T (step 114) under the situation of " O " at characteristic value H.
If difference △ SH then is set at " 1 " (step 109) with characteristic value H less than 1 ℃ (NO in the step 108).In addition, under the situation that changes operating frequency F (YES in the step 110), remove △ SHmax (N), △ SHmax (N-1) and number of times counter value N (step 111) in the memory, simultaneously characteristic value H is set at " 1 " (step 105).At this moment, be under the situation of " 1 " (YES in the step 113) at characteristic value H, checkout time counter value T (step 115).
Time counter value T and given time value T1 (for example 5 minutes) are compared (step 116).If the time, counter value T reached 5 minutes, that is the difference between setting value SHs and the degree of superheat SH in 5 minutes time constantly greater than 1 ℃ (YES in the step 115), then with yield value increase 0.2 (step 116).Adopt the number of drive pulses (step 128) of this yield value G that resets correction to PMV11 and 21.
In other words, according to loading condiction, when degree of superheat SH is higher more than 1 ℃ or low more than 1 ℃ than setting value SHs, and this situation then might reach stable status when continuing more than 5 minutes.In this case, should increase yield value G.In case increase yield value G, will be towards adjustment in direction PMV11 that increases and 21 aperture controlling value, the refrigerant flow of inflow evaporator is increased, thus removed degree of superheat SH above-mentionedly do not wish the stable state that occurs, enable promptly to converge on setting value SHs.
In some cases, the amplitude of degree of superheat SH is center fluctuation repeatedly up and down with setting value SHs, converges on setting value SHs gradually.In this case, when difference is arranged in a positive side (YES of step 118), just the maximum △ SHmax with difference △ SH is stored (step 119) again as up-to-date △ SHmax (N).
When difference △ SH by a positive side (YES in the step 120) when a negative side changes, just replace previous △ SHmax (N-1) with △ SHmax (N), stored again (step 121).When degree of superheat SH towards setting value SHs when convergence, maximum △ SHmax changes towards the direction that reduces, therefore exists the relation of △ SHmax (N-1) greater than △ SHmax (M) between previous maximum △ SHmax (N-1) and the up-to-date maximum △ SHmax (N).Detect the difference (being △ SHmax (N-1)-△ SHmax (N)) between them, be used as at the variable quantity that reduces on the direction.
Whether judge detected above-mentioned variable quantity less than setting value,, judge that simultaneously whether the maximum △ SHmax of this moment is greater than set-point, for example whether greater than 1 ℃ for example whether less than 2 ℃.Result by above-mentioned judgement just can monitor whether the amplitude variations of degree of superheat SH is in towards the state of setting value SHs convergence.
When above-mentioned variable quantity less than 2 ℃, and maximum △ SHmax is during greater than 1 ℃, that is when meeting above-mentioned decision condition, just can draw the judgement conclusion (YES in the step 122) that has vibration.When changing value greater than 2 ℃, and maximum △ SHmax just can draw the judgement conclusion (NO in the step 122) that does not have vibration during less than 1 ℃.
When having vibration, to number of times counter value N count (step 123); There is not when vibration, then number of purge counter value N (step 124).
When number of times counter value N reached set-point N1, for example twice (YES in the step 125) with regard to number of purge counter value N (step 126), reduced 0.3 (step 127) with yield value G simultaneously.Revise the number of drive pulses (step 128) of PMV11 and 21 according to this yield value G that resets.
As mentioned above, control modes such as PID can only suppress the amplitude variations of degree of superheat SH to a certain extent, if air conditioner load produces bigger variation, just are not easy to realize convergence.For the delay of this convergence, say so to a certain extent and to have no idea, yet, will produce adverse influence running if postpone excessively.Therefore, when convergence postpones or produces when dispersing, just should reduce yield value G.
When reducing yield value G, will be towards the aperture controlling value of the adjustment in direction that reduces to PMV11 and 21, reduce to flow to the variable quantity of the cold-producing medium of evaporimeter.By this method, can suppress the amplitude variations of degree of superheat SH, the degree of superheat can promptly be restrained towards setting value SHs, thereby can realize stable running.
Below second embodiment of the present invention is described.
Although the aperture controlling value to PMV11 and 21 compensates, operating frequency F also might change.The variation of operating frequency F in this case, compensates in any case, owing to still might produce the phenomenon that degree of superheat convergence postpones meticulously.Second embodiment is exactly the scheme that is used to address this problem.
Wherein outdoor controller 40 also has following function except the function of above-mentioned 1-14:
15, when the operating frequency of compressor 1 changes, adopt the 3rd checkout equipment to detect the variable quantity of the degree of superheat, this variable quantity is with detected maximum △ SHmax of first checkout equipment and poor through between the detected difference △ SH behind the preset time T3;
16,, adopt predict device to predict that degree of superheat SH reaches the needed time T 4 of set-point SHs according to detected degree of superheat variable quantity with adopt the detected difference △ SH of first checkout equipment;
17, as predicted time T4 during greater than setting-up time Tup, with the opening value of PMV towards the adjustment in direction that increases, as predicted time T4 during less than setting-up time Tup, with the opening value of PMV towards the adjustment in direction that reduces.
Other part is identical with first embodiment.
Shown in the flow chart of accompanying drawing 7,8,9,10, step 112A and 112B between step 112 and 113, have been increased, increased step 131-139 between step 121 and 122, they have represented the peculiar function of second embodiment, and other function is then identical with first embodiment.
When operating frequency F changes (YES in the step 110), characteristic value H2 is set at " 1 " (step 112A), and checkout time count value T2 (step 112B).
When difference △ SH is changed by the negative side of a positive side direction (YES in the step 120),, then after judging operating frequency F existence variation, begin to carry out time counting T2 (step 132) if characteristic value H2 is " 1 " (YES in the step 131).
When time counting T2 reaches when being worth T3 preset time, the up-to-date maximum △ SHmax (N-1) that detects in step 121 to be stored and poor (that is △ SHmax (the N)-△ SH) between the difference △ SH of now are with its variable quantity as the degree of superheat.After this, calculate the ratio between the variable quantity of the difference △ SH of now and the degree of superheat according to following formula, and add given time value T3, thereby dope from difference △ SH begin to drop to make the degree of superheat reach the setting value the needed time T 4 of SHs (step 134).
T4=△SH/(△SHmax(N-1)-△SH)+T3
Figure 11 has shown the variation of degree of superheat SH and the relation of predicted time T4.
When scheduled time T4 greater than preset time during Tup when (YES in the step 135), yield value G is increased certain numerical value, for example 0.2 (step 136).In case increase yield value G, just towards adjustment in direction PMV11 that increases and 21 aperture controlling value, the changes in flow rate amount of the cold-producing medium of inflow evaporator increased, thereby make degree of superheat SH promptly reach setting value SHs.
In addition, predicted time T4 and Tdw preset time (for example 1 minute) are compared (step 137).If predicted time T4, notes then that the amplitude of degree of superheat SH is to fluctuate up and down in the center with setting value SHs less than Tdw preset time.Therefore, under these circumstances, yield value G is reduced certain numerical value, for example 0.3 (step 138).In case reduce yield value G, just towards adjustment in direction PMV11 that reduces and 21 aperture controlling value, the changes in flow rate of the cold-producing medium of inflow evaporator is reduced, thereby the amplitude that prevents the degree of superheat is to fluctuate up and down in the center with the setting value, makes degree of superheat SH reach setting value SHs rapidly.
Although the various embodiments described above all are to be combined in should be used in the air conditioner to be illustrated, they also are applicable to other equipment that adopt freeze cycle.
Freezing cycle device as claimed in claim 1 can detect the maximum of the difference between the degree of superheat and the setting value one by one, and detect this maximum at the variable quantity that reduces on the direction, judge that whether this variable quantity is greater than set-point, if in the judgement of certain number of times, connect and satisfy above-mentioned decision condition, then towards the aperture controlling value of the adjustment in direction electric expansion valve that reduces, make the degree of superheat promptly reach setting value, thereby realize stable running.
Freezing cycle device as claimed in claim 2 can detect the maximum of the difference between the setting value and the degree of superheat one by one, detect this maximum simultaneously at the variable quantity that reduces on the direction, judge that whether this variable quantity is less than set-point, and judge that whether above-mentioned maximum is greater than set-point, if in the judgement of certain number of times, satisfy above-mentioned decision condition continuously, then towards the aperture controlling value of the adjustment in direction electric expansion valve that reduces, judge detected above-mentioned difference whether in preset time constantly greater than set-point, if the result who judges meets above-mentioned decision condition, then towards the aperture controlling value of the adjustment in direction electric expansion valve that increases, thereby can promptly make the degree of superheat converge on setting value, realize stable running.
Freezing cycle device as claimed in claim 3, it is on the basis of the described device of claim 2, further when changing, the operating frequency of compressor detects the variable quantity of the degree of superheat, be detected maximum and poor through between the difference detected after preset time, variable quantity and previous detected difference (i.e. difference between the setting value and the degree of superheat) according to this degree of superheat are predicted the required time of setting value that reaches, when this predicted time during greater than set-point, then towards the aperture controlling value of the adjustment in direction electric expansion valve that increases, when predicted time during less than preset time, then towards the aperture controlling value of the adjustment in direction electric expansion valve that reduces, thereby can promptly make the degree of superheat converge on setting value, realize stable running.
Claims (3)
1, a kind of freezing cycle device, has the cooling cycle system that is formed by connecting by compressor, condenser, electric expansion valve, evaporimeter, aperture by the control electric expansion valve, make the degree of superheat of the cold-producing medium in the evaporimeter reach first setting value, it is characterized in that this device has: first checkout equipment is used for detecting one by one the maximum of the difference between above-mentioned first setting value and the described degree of superheat; Second checkout equipment is used to detect the maximum that above-mentioned first checkout equipment obtained and is reducing the variable quantity of direction; Whether judgment device is used to judge the variable quantity that detected with above-mentioned second checkout equipment less than second setting value, and whether the maximum that is detected by above-mentioned first checkout equipment is greater than a predetermined value; Compensation equipment is used for above-mentioned judgment device when the judgement of certain number of times is satisfied above-mentioned decision condition continuously, towards the aperture controlling value of the above-mentioned electric expansion valve of adjustment in direction that reduces.
2, a kind of freezing cycle device, has the cooling cycle system that is formed by connecting by compressor, condenser, electric expansion valve, evaporimeter, aperture by the control electric expansion valve, make the degree of superheat of the cold-producing medium in the evaporimeter reach first setting value, it is characterized in that this device has: first checkout equipment is used for detecting one by one the maximum of the difference between above-mentioned first setting value and the degree of superheat; Second checkout equipment is used to detect the maximum that is obtained with above-mentioned first checkout equipment and is reducing the variable quantity of direction; First judgment device is used to judge that whether maximum that whether variable quantity that obtained with above-mentioned second checkout equipment detected less than second setting value and by above-mentioned first checkout equipment is greater than a predetermined value; First compensation equipment is used for above-mentioned first judgment device on the judgement of certain number of times is satisfied continuously during decision condition, towards the aperture controlling value of the above-mentioned electric expansion valve of adjustment in direction that reduces; Second judgment device, be used to judge the difference that obtained with above-mentioned first checkout equipment whether in the regular hour constantly greater than set-point; Second compensation equipment is used for when satisfying the decision condition of above-mentioned second judgment device towards the aperture controlling value of the above-mentioned electric expansion valve of adjustment in direction that increases.
3, freezing cycle device as claimed in claim 2 is characterized in that also comprising; The 3rd checkout equipment is used for detecting the variable quantity of the degree of superheat when the operating frequency of above-mentioned compressor changes, and this variable quantity is meant the maximum that obtained with above-mentioned first checkout equipment and poor through between the difference detected after the regular hour; Predict device is used for predicting that according to the variable quantity of the above-mentioned degree of superheat and with the difference that first checkout equipment is obtained the degree of superheat reaches the described required time of first setting value; The 3rd compensation equipment is used for time when above-mentioned prediction during greater than set-point, towards the aperture controlling value of the above-mentioned electric expansion valve of adjustment in direction that increases, when time of prediction during less than set-point, towards the aperture controlling value of the above-mentioned electric expansion valve of adjustment in direction that reduces.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP011618/1993 | 1993-01-27 | ||
| JP011618/93 | 1993-01-27 | ||
| JP1161893 | 1993-01-27 | ||
| JP05242506A JP3117339B2 (en) | 1993-01-27 | 1993-09-29 | Refrigeration cycle device |
| JP242506/1993 | 1993-09-29 | ||
| JP242506/93 | 1993-09-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1093792A CN1093792A (en) | 1994-10-19 |
| CN1071882C true CN1071882C (en) | 2001-09-26 |
Family
ID=26347076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93119985A Expired - Fee Related CN1071882C (en) | 1993-01-27 | 1993-12-31 | Refrigerant circulating arrangement |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP3117339B2 (en) |
| KR (1) | KR940018635A (en) |
| CN (1) | CN1071882C (en) |
| GB (1) | GB2274930B (en) |
| TW (1) | TW228024B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100363694C (en) * | 2003-05-05 | 2008-01-23 | 开利公司 | Vapor compression system |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5533347A (en) * | 1993-12-22 | 1996-07-09 | Novar Electronics Corporation | Method of refrigeration case control |
| US6148628A (en) * | 1999-03-26 | 2000-11-21 | Carrier Corporation | Electronic expansion valve without pressure sensor reading |
| KR100366449B1 (en) * | 2000-10-12 | 2002-12-31 | 주식회사 엘지이아이 | Control Device and Control Method of 3 way valve |
| KR100579564B1 (en) * | 2004-04-12 | 2006-05-15 | 엘지전자 주식회사 | LEV control method of cooling cycle apparatus |
| KR100664085B1 (en) * | 2005-11-24 | 2007-01-03 | 엘지전자 주식회사 | Apparatus for controlling air conditioner |
| JP4935403B2 (en) * | 2007-02-14 | 2012-05-23 | 富士電機株式会社 | Refrigerant flow control device |
| US7784296B2 (en) * | 2007-03-08 | 2010-08-31 | Nordyne Inc. | System and method for controlling an air conditioner or heat pump |
| JP4905271B2 (en) * | 2007-06-29 | 2012-03-28 | ダイキン工業株式会社 | Refrigeration equipment |
| CN101852523B (en) * | 2009-03-31 | 2012-01-11 | 海尔集团公司 | Superheat degree control method and system for refrigeration circulation system |
| JP6076583B2 (en) * | 2011-01-19 | 2017-02-08 | 三菱重工業株式会社 | heat pump |
| US9746224B2 (en) * | 2012-11-21 | 2017-08-29 | Liebert Corporation | Expansion valve setpoint control systems and methods |
| US10174977B2 (en) | 2012-11-21 | 2019-01-08 | Vertiv Corporation | Apparatus and method for subcooling control based on superheat setpoint control |
| CN104110799B (en) * | 2013-05-30 | 2016-12-07 | 广东美的制冷设备有限公司 | The integrated control method of air-conditioner electric expansion valve and circuit |
| CN103982987B (en) * | 2014-05-07 | 2016-08-31 | 广东美的暖通设备有限公司 | Prevent the method and system of coolant bias current, multi-connected air conditioner in multi-connected air conditioner |
| DK201470338A1 (en) * | 2014-06-06 | 2015-05-11 | Danfoss As | A method for detecting instability in a refrigeration system |
| CN106403425B (en) * | 2015-07-27 | 2019-04-12 | 青岛海尔空调电子有限公司 | A kind of control method for electronic expansion valve of water chiller |
| JP6468300B2 (en) | 2017-02-13 | 2019-02-13 | 株式会社富士通ゼネラル | Air conditioner |
| CN107401811A (en) * | 2017-07-26 | 2017-11-28 | 日照职业技术学院 | Air conditioner defrosting system for automobile |
| CN110285618B (en) * | 2019-06-27 | 2020-03-27 | 山东建筑大学 | Frequency conversion control device and control method of heat pump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2909190B2 (en) * | 1990-11-02 | 1999-06-23 | 株式会社東芝 | Air conditioner |
-
1993
- 1993-09-29 JP JP05242506A patent/JP3117339B2/en not_active Expired - Lifetime
- 1993-12-15 TW TW082110655A patent/TW228024B/zh not_active IP Right Cessation
- 1993-12-30 GB GB9326573A patent/GB2274930B/en not_active Expired - Fee Related
- 1993-12-31 KR KR1019930032344A patent/KR940018635A/en not_active Application Discontinuation
- 1993-12-31 CN CN93119985A patent/CN1071882C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100363694C (en) * | 2003-05-05 | 2008-01-23 | 开利公司 | Vapor compression system |
Also Published As
| Publication number | Publication date |
|---|---|
| TW228024B (en) | 1994-08-11 |
| KR940018635A (en) | 1994-08-18 |
| JP3117339B2 (en) | 2000-12-11 |
| GB9326573D0 (en) | 1994-03-02 |
| JPH06281234A (en) | 1994-10-07 |
| GB2274930B (en) | 1996-02-07 |
| GB2274930A (en) | 1994-08-10 |
| CN1093792A (en) | 1994-10-19 |
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