CN100390474C - Refrigerating device - Google Patents
Refrigerating device Download PDFInfo
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- CN100390474C CN100390474C CNB2005800015843A CN200580001584A CN100390474C CN 100390474 C CN100390474 C CN 100390474C CN B2005800015843 A CNB2005800015843 A CN B2005800015843A CN 200580001584 A CN200580001584 A CN 200580001584A CN 100390474 C CN100390474 C CN 100390474C
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- compressor
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- refrigeration
- temperature
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/22—Refrigeration systems for supermarkets
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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
- F25B2500/31—Low ambient temperatures
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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
- F25B2600/01—Timing
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/12—Sensors measuring the inside temperature
Abstract
When a guard timer of a compressor (141) expires, an R2 signal from a control section (140) of an outdoor unit is turned on (Action I). If a control section (120) of a freezer unit recognizes from an inside temperature detected by a temperature sensor (124) that the R2 signal is turned on and a request for a shift to a freezer thermo-on state is raised (Action II), a freezer electromagnetic valve (121) is opened (Action III). In general, when the electromagnetic valve (121) is opened, it is supposed that an increase in refrigerant suction pressure is detected by a pressure sensor (146) and then the compressor (141) is actuated. However, if an outside air temperature is low, the refrigerant suction pressure remains lower than a predetermined value. Therefore, the control section (120) actuates a booster compressor (131) (Action IV) to raise the refrigerant suction pressure of the compressor (141).
Description
Technical field
The present invention is about a kind of refrigerating plant, particularly about improveing the stroking technique of the compressor start when outside air temperature is low.
Background technology
Up to now, in shops such as convenience store, what use is refrigerating plant as described below, the refrigeration unit that to be the limit refrigerate on the inboard display of refrigerator display case commodity limit and limit are carried out freezing freezing unit and are connected in the same refrigerant loop on the inboard commodity limit of displaying of refrigerated display case, constitute this refrigerating plant.
Figure 15 is the refrigerant loop diagram that action summary in the employed up to now refrigerating plant 5 is described.
In the refrigerating plant 5, be arranged on the refrigerant that the compressor 541 in the outdoor outdoor unit 54 is compressed, limit heat release limit condensation in condenser 542.This is the liquid coolant of condensation, branches into part that flows into refrigeration unit 51 and the part that flows into freezing unit 52.Flow into the refrigerant of refrigeration unit 51, be depressurized in expansion valve 512, air absorbs heat and evaporates in freezer in refrigeration evaporator 513.Flow into the refrigerant of freezing unit 52, be depressurized in expansion valve 522, air absorbs heat and evaporates in freezer in refrigerating evaporator 523.
At the saturation pressure of the refrigerant of refrigerating evaporator 523, it is low keeping than the saturation pressure of refrigeration evaporator 513 by the auxiliary compressors 531 in the auxiliary unit 53.Moreover, the evaporating temperature of refrigerating evaporator 523 (about 5 ℃), be keep than the evaporating temperature (about 5 ℃) of refrigeration evaporator 513 for low.
Proceed so to cool off, after then air themperature reached the target temperature that sets in advance respectively in the freezer in refrigeration unit 51 or freezing unit 52, magnetic valve 511, magnetic valve 521 were just closed.Thus, the refrigerant that has cut off to refrigeration evaporator 513, refrigerating evaporator 523 provides (being called as refrigeration running halted state and freezing running halted state respectively).
On the other hand, in control part 540 (execution contains regulation programs such as microprocessor, ROM, RAM), detect the suction one side refrigerant pressure of compressor 541 with pressure sensor 546, when this is worth smaller or equal to setting (for example 0.10MPa), just control so that compressor 541 stops (outdoor running halted state) temporarily.
On the contrary, if when being in outdoor running halted state, in refrigeration unit 51 or the freezing unit 52 in freezing (Tibetans) storehouse air themperature and its target temperature between the temperature difference of generation prescribed level, then magnetic valve 511 and magnetic valve 521 are opened respectively, require refrigerant is supplied with refrigeration evaporator 513, refrigerating evaporator 523 (being respectively to be refrigeration running initial state, freezing running initial state).On the other hand,, detect suction refrigerant pressure by pressure sensor 546 and rise to more than the setting (for example 0.25MPa), just control so that compressor 541 starts (outdoor running initial state) at control part 540.
So, in refrigerating plant 5, just can detect whether to need to make in refrigerant any in evaporimeter 513,523 and circulate, so that compressor 541 remains in operation by pressure sensor 546.Thus, do not transmit whether do not need the signal that cools off in expression refrigeration units 51 or the freezing unit 52 to control part 540, promptly can be with simple structure, the switching that the running of easy control compressor 541 starts and running stops.
For example, disclosed refrigerating plant in the patent documentation 1 is as the refrigerating plant that is similar to it, for avoiding being with the moisture running, when sucking refrigerant pressure when setting is following, the control that compressor is stopped.
(patent documentation 1) TOHKEMY 2002-228297 communique
(inventing problem to be solved)
In the described refrigerating plant 5, as mentioned above, when being transformed into outdoor running initial state from outdoor running halted state, be lower than setting, then controlling compressor is not started if suck refrigerant pressure.But, when outside air temperature for example below-5 ℃, when extremely low, the saturation pressure of refrigerant reduces, the refrigerant pressure in the loop also reduces.Consequently,, open magnetic valve 511,521, sometimes, suck a side refrigerant pressure and keep low pressure constant, will produce the situation that compressor 541 can't start even freezing unit 52 grades require cooling.
Summary of the invention
The present invention, in view of above-mentioned all problems, it is a kind of when the outside atmosphere temperature is very low that its purpose is to provide, and also can successfully start the refrigerating plant of compressor.
The technical solution adopted in the present invention is as described below.
First technical scheme, with a kind of comprise thermal source loop with high temperature one side compressor 141 and be connected to above-mentioned thermal source loop and have evaporimeter 123 and low temperature one side compressor 131 utilize the loop, the refrigerating plant 1 that carries out the steam compression type freeze cycle is prerequisite.And, the present invention includes: the running controller, it is based on and sucks refrigerant pressure, the running startup and the running of switching above-mentioned high temperature one side compressor 141 stop, and start-up control device, it is under the situation that 141 runnings of above-mentioned high temperature one side compressor stop, at least below outside air temperature is reduced to set point of temperature and when having the cooling of above-mentioned evaporimeter 123 to require, start low temperature one side compressor 131, so that the suction refrigerant pressure of above-mentioned high temperature one side compressor 141 rises.
In technique scheme, running startup and the running that can switch high temperature one side compressor 141 based on suction refrigerant pressure stop.At this, in above-mentioned high temperature one side compressor 141 when the halted state that turns round restarts to start running, at least below outside air temperature is reduced to set point of temperature and when having the cooling of above-mentioned evaporimeter 123 to require, start low temperature one side compressor 131 so that the refrigerant pressure that above-mentioned high temperature one side compressor 141 is sucked rises.
-effect-
Therefore, according to first technical scheme, when the running of high temperature one side compressor 141 restarts, at least below outside air temperature is reduced to set point of temperature and when having the cooling of above-mentioned evaporimeter 123 to require, before this high temperature one side compressor 141, start low temperature one side compressor 131 so that the suction refrigerant pressure of high temperature one side compressor 141 rises.Thus, even under the extremely low situation of outside air temperature, the suction refrigerant pressure of high temperature one side compressor 141 also can rise really, so can start high temperature one side compressor 141 smoothly.
Description of drawings
Fig. 1 is the figure of schematic configuration of the refrigerating plant of expression first embodiment of the present invention.
Fig. 2, the action diagram when being the general situation of expression refrigerating plant.
Fig. 3 is expression with for the refrigerating plant of feature of the present invention when hanging down outside air temperature and freezing running begin relevant action diagram.
Fig. 4 is to be shown in the calcspar that the major part of (outdoor) running beginning control program that the control part of outdoor unit implements constitutes.
Fig. 5 is the flow chart that is shown in the processing sequence that running that the control part of outdoor unit implements begins to control.
Fig. 6 is the flow chart that is shown in the processing sequence of the refrigeration electromagnetic valve switch control that the control part of refrigeration unit implements.
Fig. 7 is the flow chart that is shown in the processing sequence of the freezing electromagnetic valve switch control that the control part of freezing unit implements.
Fig. 8 is to be shown in the auxiliary compressor that the control part of freezing unit implements and to start/flow chart of the processing sequence that stops to control.
The figure that refrigeration running when Fig. 9 is expression with the low outside air temperature of the refrigerating plant of second embodiment begins relevant action.
Figure 10 is to be shown in the calcspar that the major part of (outdoor) running beginning control program that the control part of outdoor unit implements constitutes.
Figure 11 is the flow chart that is shown in the processing sequence that running that the control part of outdoor unit implements begins to control.
The figure of the refrigeration running action of starting when Figure 12 is expression about the low outside air temperature of the refrigerating plant of the 3rd embodiment.
Figure 13 is to be shown in the calcspar that the major part of (outdoor) running beginning control program that the control part of outdoor unit implements constitutes.
Figure 14 is the flow chart that is shown in the processing sequence that running that the control part of outdoor unit implements begins to control.
Figure 15 is that the refrigerant loop diagram of the summary action of employed refrigerating plant up to now is described.
(symbol description)
1,2,3 refrigerating plants
113,213,313 refrigeration evaporators
123 refrigerating evaporators
131 auxiliary compressors
141,241,341 variable displacement compressors
The specific embodiment
Below, with reference to the accompanying drawings, describe the refrigerating plant 1,2,3 of embodiments of the present invention in detail.
Fig. 1 is the summary construction diagram of the refrigerating plant 1 of expression first embodiment of the invention.
As shown in Figure 1, set refrigerating plant 1 in the convenience store etc. comprises: refrigeration unit 11, freezing unit 12, auxiliary unit 13 and outdoor unit 14.
Refrigeration unit 11 has: the refrigerator display case of refrigeration and display commodity; Freezing unit 12 has: freezing and the display commodity refrigerated display case; Auxiliary unit 13, be for carry out freezing and with the pressure of refrigerant keep lower; Outdoor unit 14, be arranged on outdoor, from refrigerant to the outside atmosphere heat release.Refrigeration unit 11, freezing unit 12 and auxiliary unit 13 arranged side by side be connected on the outdoor unit 14, constitute a refrigerant loop of carrying out secondary steam compression type freeze cycle.
In the refrigeration unit 11, make heat absorption the thermal expansion valve 112 of refrigerant decompression and the air of refrigerant in freezer and the refrigeration evaporator 113 of evaporation connects with pipeline.Refrigeration unit 11 also comprises: the display rack in the refrigerator display case is sent and is absorbed heat in refrigeration evaporator 113 and the fan 115 of air in the chilled freezer.In the refrigeration unit 11, also be provided with refrigeration magnetic valve 111, when opening, the refrigerant that flows to refrigeration evaporator 113 passed through, when closing, cut off the refrigerant that flows to refrigeration evaporator 113 and flow, and in order to detect the temperature sensor 114 of air themperature in the freezer.
Refrigerate magnetic valve 111, thermal expansion valve 112 and refrigeration evaporator 113, connecting according to the order in 201 flow direction outflows, the one side pipe road 202, inflow one side pipe road that refrigerates unit 11 certainly connects.
Equally, in the freezing unit 12, the air heat absorption and the refrigerating evaporator 123 of evaporation is to be connected with pipeline in the freezer of the thermal expansion valve 122 that makes refrigerant decompression and refrigerant.Freezing unit 12 also comprises: the display rack in the refrigerated display case is sent and is absorbed heat in refrigerating evaporator 123 and the fan 125 of air in the chilled freezer.In the freezing unit 12, also be provided with freezing magnetic valve 121, when opening, the refrigerant that flows to refrigerating evaporator 123 passed through, when closing, cut off the refrigerant that flows to refrigerating evaporator 123 and flow, and in order to detect the temperature sensor 124 of air themperature in the freezer.
Freezing magnetic valve 121, thermal expansion valve 122 and refrigerating evaporator 123 flow to the order that flows out a side pipe road 204 according to the inflow one side pipe road 203 from freezing unit 12 and are connecting and connect.
Auxiliary unit 13 comprises auxiliary compressor 131.This auxiliary compressor 131, the refrigerant pressure than by refrigeration evaporator 113 that will keep by the refrigerant pressure of refrigerating evaporator 123 is low.
Assist unit 13, be included in the bypass 132 of its auxiliary compressor that has non-return valve 133 midway 131.This bypass 132 constitutes when auxiliary compressor 131 is out of order or stops, and refrigerant can lead to towards outdoor unit 14 1 effluents by bypass auxiliary compressor 131.In other words, when driving auxiliary compressor 131, refrigerant is not by bypass 132.Non-return valve 133 only allows that refrigerant flows to outflow one side pipe road 206 from the inflow one side pipe road 205 of auxiliary unit 13.
Outdoor unit 14 comprises: variable displacement compressor 141, condenser 142 and accumulator 143.Variable displacement compressor 141 constitutes: according to the cooling load pondage of refrigeration unit 11 grades.Condenser 142 constitutes: make refrigerant towards the outside atmosphere heat release and condensation.Accumulator 143 is in order to will temporarily storing at the liquid coolant of condenser 142 condensations.In other words, in this refrigerating plant 1, variable displacement compressor 141 constitutes high temperature one side compressor, and auxiliary compressor 131 constitutes low temperature one side compressor.
Be provided with in the outdoor unit 14 in order to outside atmosphere is sucked the fan 144 of condenser 142.In the outdoor unit 14, also comprise in order to temperature sensor 145 that detects outside air temperature and the pressure sensor 146 that is inhaled into the refrigerant pressure of variable displacement compressor 141 in order to detection.
The inflow one side pipe road 207 of outdoor unit 14 connects the outflow one side pipe road 206 of auxiliary unit 13 and the outflow one side pipe road 202 of refrigeration unit 11.The outflow one side pipe road 208 of outdoor unit 14 connects the inflow one side pipe road 201 of refrigeration unit 11 and the inflow one side pipe road 203 of freezing unit 12.The outflow one side pipe road 204 of freezing unit 12 is connected on the inflow one side pipe road 205 of auxiliary unit 13.
Be provided with control part 140 in the outdoor unit 14.This control part 140 carries out volume controlled to variable displacement compressor 141, so that the refrigerant pressure in the evaporimeter 113,123 remains necessarily.Afterwards, with reference to figure 4～Fig. 8, describe the control situation of control part 140 involved in the present invention in detail.
This refrigerating plant 1 is as Fig. 2, action as shown in Figure 3.Fig. 2 is the figure of regular event of expression refrigerating plant 1, the figure that Fig. 3 is expression as the refrigerating plant outside air temperature of feature of the present invention begins relevant action with freezing running when low.
As shown in Figure 2, in the outdoor running initial state that variable displacement compressor 141 is driven, each magnetic valve 111,121 is opened, and refrigeration unit 11 becomes refrigeration running initial state, and freezing unit 12 becomes freezing running initial state.Particularly, variable displacement compressor 141 1 drives, just heat release and condensation in condenser 142 of the refrigerant that is compressed.The liquid coolant of condensation is divided into part that flows into refrigeration unit 11 and the part that flows into freezing unit 12 by accumulator 143.
In refrigeration unit 11, in refrigeration evaporator 113 heat absorptions and evaporate, air is cooled in the freezer of refrigerator display case by the refrigerant of expansion valve 112 decompression.In freezing unit 12, in refrigerating evaporator 123 heat absorptions and evaporate, air is cooled in the freezer of refrigerated display case by the refrigerant of expansion valve 122 decompression.The refrigerant that flows out from freezing unit 12 is compressed auxiliary compressor 131.Refrigerant after the compression, the refrigerant interflow with refrigerating unit 11 outflows certainly is inhaled in the variable displacement compressor 141 of outdoor unit 14, repeats the circulation of these refrigerants.
If air themperature reaches the target temperature of prior setting in the freezer in the refrigerator display case, then refrigerate magnetic valve 111 and close, cut off the refrigerant that flows to refrigeration evaporator 113 mobile (refrigeration running halted state).Equally, if the temperature of the interior air of the freezer in the refrigerated display case reaches the target temperature of prior setting, then freezing magnetic valve 121 cuts out, and auxiliary compressor 131 stops simultaneously, has cut off the refrigerant mobile (freezing running halted state) that flows to refrigerating evaporator 123.If become refrigeration running halted state and freezing running halted state, then the suction refrigerant pressure of variable displacement compressor 141 reduces.One detects this suction refrigerant pressure reduces, and variable displacement compressor 141 just stops and becoming outdoor running halted state.
In outside air temperature-5 ℃ be that the refrigeration running begins/stops, by control part 110 automatic switchovers of refrigeration unit 11 under the high normal condition; Freezing running begins/stops, by control part 120 automatic switchovers of freezing unit 12.Outdoor running begins/stops, and is begun/stop to begin/stop and automaticallying switch with freezing running based on these refrigeration runnings by the control part 140 of outdoor unit 14.Remark additionally, need with reference to aftermentioned control part 110 and control parts 120 such as figure 4.
Under outside air temperature is situation obviously low below-5 ℃, the freezing storehouse temperature and the difference between target temperature of freezing unit 12 are big than setting, and produce the requirement that freezing running begins, and freezing magnetic valve 121 is opened, and the suction refrigerant pressure of variable displacement compressor 141 can rise hardly.But as shown in Figure 3, refrigerating plant 1 involved in the present invention as distinctive control, for the suction refrigerant pressure that makes variable displacement compressor 141 rises, and before variable displacement compressor 141 starts, forces to make auxiliary compressor 131 to start earlier.
In other words, the guard time one of variable displacement compressor 141 finishes, and is sent to the R2 signal just bright (action I) of the control part 120 of freezing unit 12 from the control part 140 of outdoor unit 14.If in the control part 120 of freezing unit 12, based on temperature value in the freezer that detects by temperature sensor 124, to judge the freezing running of generation and begin requirement (action II), freezing magnetic valve 121 is just opened (action III).
Remark additionally, the guard time of variable displacement compressor 141 is in order to prevent compressor because repeated priming in the short time, stop and damaging, and has passed through the time that finishes again after about 1,2 minute when compressor stops.
Under the normal condition, because this freezing magnetic valve 121 1 is opened, the refrigerant of variable displacement compressor 141 ejections one side just can flow into suction one side of variable displacement compressor 141 by the bypass 132 of auxiliary compressor 131, rises so suck the pressure of refrigerant.Rise if detected the pressure of this suction refrigerant by pressure sensor 146, variable displacement compressor 141 just is activated.But if outside air temperature is extremely low, then the suction refrigerant pressure of variable displacement compressor 141 is low than setting always.So the control part 102 of freezing unit 12 just forces to make auxiliary compressor 131 to start (action IV), and the pressure of the suction refrigerant of variable displacement compressor 141 is risen.
Rise (action V) if detect this suctions refrigerant pressure by pressure sensor 146, then variable displacement compressor 141 is activated (move VI) based on this.
Below, with reference to figure 4 to Fig. 8, be described in detail in the control of these refrigerating plants 1.
Fig. 4, it is a calcspar, be shown in the formation that outdoor running that the control part 140 of outdoor unit 14 implemented begins the major part of control program, and the pattern of relation is gone in the output of the control part 120 of the control part 110 of control part 140, refrigeration unit 11 and freezing unit 12.
In the control part 140 of outdoor unit 14, carry out running shown in Figure 5 and begin control program.In the control part 110 of refrigeration unit 11, carry out refrigeration electromagnetic valve switch control program shown in Figure 6.In the control part 120 of freezing unit 12, execution graph 7 and freezing electromagnetic valve switch control program and auxiliary compressor shown in Figure 8 start, stop control program.Processing in each control part 110,120,140 is parallel.
As shown in Figure 4, the control part 140 of outdoor unit 14 has electromagnetic valve switch permission portion 1401, compressor start condition judgment portion 1402 and compressor start portion 1403.
Electromagnetic valve switch permission portion 1401 constitutes, and the guard time one of variable displacement compressor 141 finishes, and just uses to permit each magnetic valve 111,121 is opened, auxiliary compressor 131 starts R1 signal and R2 signal bright.Compressor start condition judgment portion 1402 constitutes, and whether judge the suction refrigerant pressure LP that detected by the pressure sensor 146 and outside air temperature Ta that detected by temperature sensor 145 etc. is the value of prescribed limit.Compressor start portion 1403 constitutes: when sucking refrigerant pressure LP, outside air temperature Ta etc. is respectively under the situation of the value in the prescribed limit, and variable displacement compressor 141 is started.
The control part 110 of refrigeration unit 11 comprises: cooling requires judging part 1101 and electromagnetic valve switch portion 1102.
Cooling requires judging part 1101, judges whether whether the difference of refrigeration storehouse temperature that is detected by temperature sensor 145 and the target temperature of setting in advance (require to begin the refrigeration running) more than setting.Cooling requires judging part 1101 further to judge whether the R1 signal is bright.Closed electromagnetic valve portion 1102 constitutes: begin to refrigerate running requirements and the R1 signal is bright if having, then will refrigerate magnetic valve 111 and open.
The control part 120 of freezing unit 12 comprises: cooling requires judging part 1201, electromagnetic valve switch portion 1202 and auxiliary compressor to start/stop portion 1203.
Cooling requires judging part 1201, judges whether whether the difference of freezing storehouse temperature that is detected by temperature sensor 124 and the target temperature of setting in advance (require to begin freezing running) more than setting.Cooling requires judging part 1201 further to judge whether the R2 signal is bright.Closed electromagnetic valve portion 1202 constitutes: freezing running requirements of beginning and R2 signal are bright as if having, and then freezing magnetic valve 121 are opened.Auxiliary compressor starts/stops portion 1203, constitutes: if there is the freezing running requirements R2 signal of beginning bright, then start auxiliary compressor 131.
At this, mainly be that compressor start condition judgment portion 1402 and compressor start portion 1403 constitute the running (entry into service) of variable displacement compressor 141 and stop the running controller that (running stops) switching temporarily.Cooling requires judging part 1201, electromagnetic valve switch portion 1202 and auxiliary compressor to start, stop portion's 1203 formation start-up control devices; it is under the situation that variable displacement compressor 141 stops; if have the cooling requirement of freezing unit 12 and the rated conditions such as guard time end of variable displacement compressor 141 to be satisfied, auxiliary compressor 131 is started.
Therefore, be pursuant to the performed program of each control part 110,120,140, because outside air temperature is very low, even so under the situation that the suction refrigerant pressure (part) of variable displacement compressor 141 reduces, also can rise by the compulsory suction refrigerant pressure of variable displacement compressor 141 that makes by the startup of auxiliary compressor 131.Particularly, be to carry out according to following processing sequence.
As shown in Figure 5, begin at first, judge whether the guard time of variable displacement compressor 141 finishes (step 111, below represent step) in the control in the running that the control part 140 by outdoor unit 14 is carried out with ST.If guard time does not finish as yet, (being "No" among the ST111), then this processing will so finish.If guard time finishes (among the ST111 for "Yes"), then allow the R1 signal that refrigeration magnetic valve 111 is opened and allow freezing magnetic valve 121 open the R2 signal that starts with auxiliary compressor 131 just bright (ST112).
Then, judge that whether the suction refrigerant pressure LP of variable displacement compressor 141 is greater than 0.25MPa (ST113).If suck refrigerant pressure LP greater than 0.25MPa (being "Yes" among the ST113), then variable displacement compressor 141 is activated (ST114).This processing finishes.
If suck refrigerant pressure LP (being "No" among the ST111) below 0.25MPa, then be judged as the outside air temperature Ta that detects by temperature sensor 145 and be lower than-5 ℃, and the dwell time of variable displacement compressor 141 was more than or equal to 10 minutes (ST115).If this condition is satisfied (is "Yes" in ST115), then will variable displacement compressor 141 compulsory startups in ST114.If outside air temperature Ta is more than or equal to-5 ℃, perhaps the dwell time of variable displacement compressor 141 was less than 10 minutes (being "No" in ST115), and then this processing finishes.
Even handle to suck by these refrigerant pressure LP low and can not start variable displacement compressor 141 the time; if guard time finishes; then R1 signal and R2 signal are bright, allow magnetic valve 111,112 relative each control parts 110,120 to open and start auxiliary compressor 131.
As shown in Figure 6, refrigerate in the electromagnetic valve switch control at control part 110 by refrigeration unit 11, at first, whether the difference of judging refrigeration storehouse temperature that is detected by temperature sensor 114 and the target temperature of setting in advance produces the refrigeration running and begins requirement (ST121) more than or equal to setting.Do not begin requirement (being "No" in ST121) if do not produce the refrigeration running, then refrigerate magnetic valve 111 former states and closing (ST122), this processing finishes.
Begin requirement (is "Yes" in step ST121) if produce the refrigeration running, then judge the R1 signal whether bright (ST123).If R1 signal not bright as yet (is "No" in ST123) is then closed in ST122 refrigeration magnetic valve 111 former states, this processing finishes.If R1 signal not bright as yet (being "Yes" in step 123) then refrigerates magnetic valve 111 and is opened (ST124), this processing finishes.
As shown in Figure 7, in the freezing electromagnetic valve switch control that the control part 120 by freezing unit 12 is carried out, carry out and the same processing of above-mentioned refrigeration electromagnetic valve switch control.In other words, detection according to the freezing storehouse temperature in the temperature sensor 124, do not begin requirement (being "No" among the ST131) if produce freezing running, or the state (is "No" in ST133) that do not work of R2 signal, then freezing magnetic valve 121 is cutting out constant (ST132), and this processing finishes.If produce freezing running begin requirement and R2 signal bright (among the ST131 for being "Yes" among "Yes" and the ST133), then freezing magnetic valve 121 is opened (ST134).This processing finishes.
As shown in Figure 8, carrying out auxiliary compressor at the control part 120 that utilizes freezing unit 12 starts/stops in the control, do not begin requirement (ST141 is a "No") if produce freezing running, or the state (ST143 is a "No") that do not work of R2 signal, then auxiliary compressor 131 stops (ST142), and this processing finishes.And freezing running begins requirement and R2 signal bright (ST141 is "Yes" among "Yes" and the ST143) if produce, and then auxiliary compressor 131 is activated (ST144), and this processing finishes.
Generally speaking, if freezing magnetic valve 121 is opened by freezing electromagnetic valve switch control, become the state that refrigerant can circulate in the refrigerant loop, the suction refrigerant pressure of variable displacement compressor 141 just rises, based on the judgement of the ST113 that begins to control in running, start variable displacement compressor 141.But,, suck refrigerant pressure and rise hardly, so so just can not start variable displacement compressor 141 because outside air temperature is low.
So, in this refrigerating plant 1, auxiliary compressor 131 is started, so the suction refrigerant pressure of variable displacement compressor 141 is risen because start/stop control by auxiliary compressor.Therefore, based on the judgement of the ST113 that begins to control in running, just can start variable displacement compressor 141 reliably.In other words, by these control,, also can start variable displacement compressor 141 smoothly in the very low situation of outside air temperature.
Then, the refrigerating plant 2 of second embodiment of the present invention and the refrigerating plant 3 of the 3rd embodiment are described.In this refrigerating plant 2,3, freezing unit and auxiliary unit in first embodiment have been omitted.When these refrigerating plants 2,3 are described, with the refrigerating plant 1 function identical inscape of identical symbolic representation with first embodiment, detailed.
Fig. 9 is that the outside air temperature of expression refrigerating plant 2 turns round with refrigeration when low and begins relevant action diagram.
In refrigerating plant 2, the guard time one of compressor 241 finishes, and is sent to the R1 signal just bright (action I) of the control part 210 of refrigeration unit 21 from the control part 240 of outdoor unit 24.If in the control part 210 of refrigeration unit 21, based on temperature value in the freezer that detects by temperature sensor 214, to judge generation refrigeration running and begin requirement (action II), magnetic valve 211 is just opened (action III).
At this, when outside air temperature is hanged down, detect these outside air temperatures by temperature sensor 245, make threshold value reduce (action IV) as the suction refrigerant pressure of the judgment standard that compressor 241 is started.If by the suction refrigerant pressure threshold value deficiency (action V) after changing that pressure sensor 246 detects, then compressor 241 is activated (action VI).
With reference to Figure 10 and Figure 11, describe so control in detail.
Figure 10 is a calcspar, is shown in the major part that running that the control part 240 of outdoor unit 24 implemented begins control program and constitutes.Particularly, in the control part 240, carry out running shown in Figure 11 and begin control program, carry out and the same refrigeration electromagnetic valve switch control program of Fig. 6 in the control part 210 of refrigeration unit 21.
In the control part 240 of outdoor unit 24, comprise electromagnetic valve switch permission portion 2401, compressor start condition changing unit 2402, compressor start condition judgment portion 2403 and compressor start portion 2404.
The guard time one of compressor 241 finishes, and electromagnetic valve switch permission portion 2401 just uses the R1 signal of opening with permission magnetic valve 211 bright.Compressor start condition changing unit 2402 based on the outside air temperature Ta that is detected by temperature sensor 245, reduces the suction refrigerant pressure threshold that is used for starting compressor 241.Compressor start condition judgment portion 2403 judges whether the suction refrigerant pressure LP that is detected by pressure sensor 246 is the value of prescribed limit.When to suck refrigerant pressure LP be value in the prescribed limit, compressor start portion 2404 started compressors 241.
The control part 210 of refrigeration unit 21 is the same with the refrigerating plant 1 of first embodiment, comprise: judged whether that the refrigeration running begins requirement, whether bright cooling requires judging part 2101 to the R1 signal simultaneously, and, then will refrigerate the electromagnetic valve switch portion 2102 that magnetic valve 211 is opened if having refrigeration running to begin requirement and the R1 signal is bright.
At this, mainly be that the running that compressor start condition judgment portion 2403 and compressor start portion 2404 constitute compressor 241 starts the running controller that stops to switch with running.Compressor start condition changing unit 2402 constitutes a reference value change device, if outside air temperature is lower than set point of temperature, the judgment standard whether running of compressor 241 is begun sucks promptly that the threshold value of refrigerant pressure reduces.
Therefore, be pursuant to the performed program of each control part 210,240, even because of outside air temperature is very low, under the situation that the suction refrigerant pressure of compressor 241 reduces, the threshold value that sucks refrigerant pressure is reduced, thereby start compressor 241 reliably.Particularly, be to carry out according to following processing sequence.Remark additionally, the same in the refrigeration electromagnetic valve switch control that the control part 210 of freezing unit 21 is performed with Fig. 6, illustrate that omission do not carry.
As shown in figure 11, begin at first, to judge whether the guard time of compressor 241 finishes (ST201) in the control in the running that the control part 240 by outdoor unit 24 is carried out.If guard time does not finish as yet, (being "No" among the ST201), then this processing will so finish.If guard time finishes (being "Yes" among the ST201), then allow the R1 signal bright (ST202) that refrigeration magnetic valve 211 is opened.
Then, judge that whether the suction refrigerant pressure LP of compressor 241 is greater than 0.4MPa (ST203).If suck refrigerant pressure LP greater than 0.4MPa (being "Yes" among the ST203), then compressor 241 is activated (ST204).This processing finishes.
If suck refrigerant pressure LP (be "No" among the ST204) below 0.4MPa, judge then whether whether outside air temperature Ta be lower than 0 ℃ and suction refrigerant pressure LP greater than 0.25MPa (ST205).If this condition is satisfied (being "Yes" in ST205), then start compressor 241 among the ST204, this processing finishes.
If the condition of ST205 does not satisfy, in other words, outside air temperature Ta perhaps sucks refrigerant pressure LP smaller or equal to 0.25MPa (ST205 is a "No") more than or equal to 0 ℃, judges then whether outside air temperature Ta is lower than-5 ℃ and whether suck refrigerant pressure LP greater than 0.2M Pa (ST206).If this condition is satisfied (is "Yes" in ST206), then start compressor 241 among the ST204, this processing finishes.Outside air temperature Ta is more than or equal to-5 ℃ or suck refrigerant pressure LP smaller or equal to 0.2MPa (being "No" among the ST206), does not then start compressor 241, and this processing finishes.
In these processing sequences, if at ST202, bright and refrigeration unit 21 1 sides of R1 signal produce the refrigeration running and begin requirement, then refrigerate magnetic valve 211 and open.But under the very low situation of outside air temperature, even refrigeration magnetic valve 211 is opened, the suction refrigerant pressure of compressor 241 also can reduce hardly, is keeping constant.So, reducing by 0 ℃ ,-5 ℃ according to outside air temperature from the fiducial temperature of defined, the threshold value that makes the suction refrigerant pressure that compressor 241 starts is reduced to 0.25MPa, 0.2MPa from the 0.4MPa stage.Impel the startup of compressor 241 thus.In other words, according to these control, when outside air temperature is very low, compressor 241 is started smoothly.
Figure 12 is that the outside air temperature of refrigerating plant 3 of expression the 3rd embodiment turns round with refrigeration when low and begins relevant action diagram.
In refrigerating plant 3, the guard time one of compressor 341 finishes, and is sent to the R1 signal just bright (action I) of the control part 310 of refrigeration unit 31 from the control part 340 of outdoor unit 34.If in the control part 310 of refrigeration unit 31, based on temperature value in the freezer that detects by temperature sensor 314, to judge and produce the refrigeration running and begin requirement (action II), refrigeration magnetic valve 311 is just opened (action III).
At this, because outside air temperature is when very low, the saturation pressure of refrigerant reduces, so even refrigeration magnetic valve 311 is opened, the suction refrigerant pressure of compressor 341 also reduces hardly, is keeping former state constant.In this refrigerating plant 3, one detects outside air temperature very low (action IV), and just the motor to compressor 341 begins phase shortage energising (action V).Remark additionally, phase shortage energising is under the non-rotary situation of motor, makes its coil heating and uses as heater, disconnects the phase in the three-phase alternating current, makes current flowing.
By this phase shortage energising, the refrigerant temperature that is in the compressor 341 that stops to rise, and near the refrigerant saturation pressure compressor 341 suction inlets rises.Therefore, if the suction refrigerant pressure that is detected by pressure sensor 346 rises, the pressure condition of defined very sufficient (action VI), then compressor 341 starts (action VII).
With reference to Figure 13 and Figure 14, the control at this refrigerating plant 3 is described.
Figure 13 is a calcspar, is shown in the major part that running that the control part 340 of outdoor unit 34 implemented begins control program and constitutes.Particularly, in the control part 340 of outdoor unit 34, carry out running shown in Figure 14 and begin control program, carry out and the same refrigeration electromagnetic valve switch control program of Fig. 6 in the control part 310 of refrigeration unit 31.
In the control part 340 of outdoor unit 34, comprising: electromagnetic valve switch permission portion 3401, phase shortage power-on command portion 3402, compressor start condition judgment portion 3403 and compressor start portion 3404.
The guard time one of compressor 341 finishes, and electromagnetic valve switch permission portion 3401 just uses the R1 signal of opening with permission refrigeration magnetic valve 311 bright.Phase shortage power-on command portion 3402, based on the outside air temperature Ta that detects by temperature sensor 345, the energising of order phase shortage.Compressor start condition judgment portion 3403 judges whether the suction refrigerant pressure LP that is detected by pressure sensor 346 is the value of prescribed limit.Compressor start portion 3404 when to suck refrigerant pressure LP be value in the prescribed limit, starts compressor 341.
The control part 310 of refrigeration unit 31 is the same with the refrigerating plant 1 of first embodiment, comprise: judged whether that the refrigeration running begins requirement, whether bright cooling requires judging part 3101 to the R1 signal simultaneously, and, then will refrigerate the electromagnetic valve switch portion 3102 that magnetic valve 311 is opened if having refrigeration running to begin requirement and the R1 signal is bright.
At this, mainly be that the running that compressor start condition judgment portion 3403 and compressor start portion 3404 constitute compressor 341 starts the running controller that stops to switch with running.Phase shortage power-on command portion 3404 constitutes the energising controller, if when the running of compressor 341 stops, outside air temperature is low than set point of temperature and has the refrigeration running to begin requirement that then the motor to compressor 341 carries out the phase shortage energising, rises so that suck refrigerant pressure.
Therefore, be pursuant to the performed program of each control part 310,340, even be opened at refrigeration magnetic valve 311, but because of outside air temperature very low, under the situation that the suction refrigerant pressure of compressor 341 reduces, also can be to the motor phase shortage energising of compressor 341, the compulsory suction refrigerant pressure of compressor 341 that makes rises.Particularly, be to carry out according to following processing sequence.Remark additionally, the same in the refrigeration electromagnetic valve switch control that the control part 310 of refrigeration unit 31 is performed with Fig. 6, illustrate that omission do not carry.
As shown in figure 14, begin at first, to judge whether the guard time of compressor 341 finishes (ST301) in the control in the running that the control part 340 by outdoor unit 34 is carried out.If guard time does not finish (being "No" among the ST301) as yet, then this processing will so finish.If guard time finishes (being "Yes" among the ST301), then allow the R1 signal bright (ST302) that refrigeration magnetic valve 311 is opened.
Then, judge that whether the suction refrigerant pressure LP of compressor 341 is greater than 0.25MPa (ST303).If suck refrigerant pressure LP greater than 0.25MPa (ST303 is a "Yes"), then be set at the phase shortage energising and be under an embargo, to carry out (ST304) after the common energising, compressor 341 is activated (ST305), this processing end.
If suck refrigerant pressure LP (being "No" among the ST303) below 0.25MPa, judge then whether outside air temperature Ta is lower than-5 ℃, and whether phase shortage conduction time is more than or equal to 5 minutes (ST306).At this, if outside air temperature Ta is more than or equal to-5 ℃, perhaps phase shortage then is judged as less than 5 minutes (being "No" among the ST306) conduction time: outside air temperature Ta is lower than the dwell time of-5 ℃ and compressor 341 more than or equal to 5 minutes (ST307).
In ST307, if outside air temperature Ta is lower than the dwell time of-5 ℃ and compressor 341 more than or equal to 5 minutes (being "Yes" among the ST307), then phase shortage energising licensed (ST308) is back to ST301 (control beginning) once more.Afterwards, move on to ST303 from ST301, whether the suction refrigerant pressure LP that judges compressor 341 once more is greater than 0.25MPa.At this, switch on greater than 0.25MPa (being "Yes" among the ST303) by phase shortage if suck refrigerant pressure LP, then as mentioned above, after the phase shortage energising is under an embargo (ST304), compressor 341 is activated (ST305), and this processing finishes.
In other words, in ST307, if not only outside air temperature Ta is lower than-5 ℃, and compressor 341 thinks that then the refrigerant temperatures in this compressor 341 obviously reduce because running has been spent 5 minutes again after stopping, and carries out phase shortage and switches on.
On the other hand, in ST303, although carry out phase shortage energising, suck under the situation of refrigerant pressure LP smaller or equal to 0.25MPa (being "No" among the ST303), judge once more in ST306 then whether whether outside air temperature Ta be lower than-5 ℃ and phase shortage conduction time more than or equal to 5 minutes.At this, if satisfy this condition (being "Yes" among the ST306), then enter ST304 and ST305, start compressor 341, this processing finishes.On the contrary, if condition does not satisfy (being "No" among the ST306), then enter ST307 once more.In other words,,, do not reach authorized pressure, but, think that then how much suck refrigerant pressure LP rises a bit, starts compressor 341 if carry out the phase shortage energising of stipulated time so suck refrigerant pressure LP because outside air temperature is low at ST306.
In ST307, if outside air temperature Ta less than 5 minutes (be "No" among the ST307), then under the situation that the phase shortage energising is not allowed to, is back to ST301 (control begins) more than or equal to the dwell time of-5 ℃ or compressor 341 once more, afterwards, carry out and above-mentioned the same action.
In these processing sequences, if at ST302, the R1 signal is bright and produce the refrigeration running and begin requirement, then refrigerates magnetic valve 311 and opens.But if outside air temperature is very low, then the suction refrigerant pressure of compressor 341 is reducing constantly, and the motor of compressor 341 is carried out the phase shortage energising, then can make the compulsory rising of suction refrigerant pressure LP of compressor 341, certain startup compressor 341.
Remark additionally, the refrigerating plant of above-mentioned embodiment is to utilize temperature sensor 145,245,345 only directly to detect outside air temperature, to detect its reduction.But the present invention is not limited to this, but near the also refrigerant temperature test example such as high-pressure dome type compressor 141,241,341 ejiction openings.At this moment, low if near the refrigerant temperature for example ejiction opening, is judged as outside air temperature smaller or equal to 20 ℃.So, though a damage in two temperature sensors, reduction that also can the reliable detection outside air temperature.
In the refrigerating plant 1,2,3 in above-mentioned each embodiment,, be to use magnetic valve and expansion valve in order to control in refrigeration unit 11,21,31 1 sides, freezing unit 12 1 sides.But, can replace it, use other valves such as electric expansion valve.Controlling these valves opens when the running beginning.At this moment, open equally, utilize and to open electric expansion valve, only start compressor, just can make it become the state that refrigerant circulates in the loop with above-mentioned magnetic valve.
Remark additionally, above embodiment is optimal example.The present invention does not also also limit it and uses thing or its purposes scope.
-industrial applicibility-
In sum, the present invention is to comprising based on the height that sucks refrigerant pressure, switching running and open The refrigerating plant moving and compressor that running stops is useful.
Claims (1)
1. a refrigerating plant (1), comprise thermal source loop with high temperature one side compressor (141) and be connected to above-mentioned thermal source loop and have evaporimeter (123) and low temperature one side compressor (131) utilize the loop, and carry out the steam compression type freeze cycle, it is characterized by:
Comprise:
The running controller, based on the pressure that sucks refrigerant, the running startup and the running of switching above-mentioned high temperature one side compressor (141) stop, and
The start-up control device, under the situation that above-mentioned high temperature one side compressor (141) running stops, at least below outside air temperature is reduced to set point of temperature and when having the cooling of above-mentioned evaporimeter (123) to require, low temperature one side compressor (131) is started, so that the pressure of the suction refrigerant of above-mentioned high temperature one side compressor (141) rises.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP265548/2004 | 2004-09-13 | ||
| JP2004265548 | 2004-09-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1906450A CN1906450A (en) | 2007-01-31 |
| CN100390474C true CN100390474C (en) | 2008-05-28 |
Family
ID=36060027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005800015843A Expired - Fee Related CN100390474C (en) | 2004-09-13 | 2005-09-13 | Refrigerating device |
Country Status (6)
| Country | Link |
|---|---|
| US (2) | US20070137231A1 (en) |
| EP (1) | EP1790919A1 (en) |
| CN (1) | CN100390474C (en) |
| AU (1) | AU2005283464B2 (en) |
| TW (1) | TWI272365B (en) |
| WO (1) | WO2006030776A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103874897A (en) * | 2011-10-07 | 2014-06-18 | 丹佛斯公司 | Method of coordinating operation of compressors |
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| US20070137231A1 (en) * | 2004-09-13 | 2007-06-21 | Masaaki Takegami | Refrigeration system |
| US8826680B2 (en) * | 2005-12-28 | 2014-09-09 | Johnson Controls Technology Company | Pressure ratio unload logic for a compressor |
| KR100800002B1 (en) * | 2007-03-15 | 2008-01-31 | 엘지전자 주식회사 | Air conditioning system |
| FR2934018B1 (en) * | 2008-07-18 | 2010-08-20 | Valeo Systemes Thermiques | DEVICE FOR CONTROLLING A COMPRESSOR WITH FIXED CAPABILITY |
| EP2623901A1 (en) * | 2012-02-02 | 2013-08-07 | Danfoss A/S | Method of coordinating operation of compressors |
| JP5310911B1 (en) * | 2012-06-13 | 2013-10-09 | ダイキン工業株式会社 | Refrigeration equipment |
| CN103591742B (en) * | 2012-08-15 | 2016-01-20 | 珠海格力电器股份有限公司 | Condensation unit start-up control method, Apparatus and system |
| CN103776212B (en) * | 2012-10-25 | 2015-12-02 | 珠海格力电器股份有限公司 | The control method of condensation unit and control device in refrigeration system |
| JP2018119777A (en) * | 2017-01-25 | 2018-08-02 | 株式会社デンソー | Refrigeration cycle device |
| CN113432269A (en) * | 2021-05-28 | 2021-09-24 | 青岛海尔空调电子有限公司 | Control method of refrigeration and freezing unit and refrigeration and freezing unit |
| CN113418328B (en) * | 2021-05-28 | 2023-02-03 | 青岛海尔空调电子有限公司 | Control method for refrigerating and freezing unit and refrigerating and freezing unit |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20090120113A1 (en) | 2009-05-14 |
| TWI272365B (en) | 2007-02-01 |
| CN1906450A (en) | 2007-01-31 |
| EP1790919A1 (en) | 2007-05-30 |
| US20070137231A1 (en) | 2007-06-21 |
| WO2006030776A1 (en) | 2006-03-23 |
| AU2005283464B2 (en) | 2008-02-28 |
| TW200619578A (en) | 2006-06-16 |
| AU2005283464A1 (en) | 2006-03-23 |
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