CN1123750C - Showcase cooling apparatus - Google Patents
Showcase cooling apparatus Download PDFInfo
- Publication number
- CN1123750C CN1123750C CN97120540A CN97120540A CN1123750C CN 1123750 C CN1123750 C CN 1123750C CN 97120540 A CN97120540 A CN 97120540A CN 97120540 A CN97120540 A CN 97120540A CN 1123750 C CN1123750 C CN 1123750C
- Authority
- CN
- China
- Prior art keywords
- overload
- show window
- magnetic valve
- cooling apparatus
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
- A47F3/00—Show cases or show cabinets
- A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
- A47F3/0482—Details common to both closed and open types
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
-
- 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
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Freezers Or Refrigerated Showcases (AREA)
Abstract
To control a showcase and a refrigerating machine reasonably and realize the high freshness control of commodities and energy saving. A synthetic controller 35, provided between a showcase group 1 and a refrigerating machine 6 to control a system reasonably, is constituted of an overload detecting unit 43, an overload control unit 46 and a rotating number command operating unit 5. The overload detecting unit 43 detects that the cooling load of the showcases has exceeded the capacity of a refrigerating machine, the overload control unit 46 controls the setting values of temperatures of the showcases so as to be reduced by given values for a given period of time within ranges capable of maintaining the freshness of commodities in accordance with a predetermined preferential order when the cooling load of the showcases has exceeded the capacity of the refrigerating machine to eliminate the overload condition. The rotating number command operating unit 5 obtains a rotating number command (renewal) for a compressor 9 based on a difference between the set value of a suction refrigerant pressure and an actual pressure (output of a pressure sensor 7).
Description
Technical field
The present invention relates to one and when surpassing the load capacity of refrigerator, can eliminate the show window overload fast when show window cooling load (, will only be called load hereinafter), thereby keep the showcase cooling apparatus of commodity freshness except specifying.
Background technology
The example of one common (showcase cooling apparatus) is described with reference to Fig. 9 and Figure 12.Fig. 9 one illustrates the block diagram of common (showcase cooling apparatus) example structure.Common example roughly comprises a show window group 1 and a refrigerator 6.Show window group 1 comprises one group of show window 1A, 1B, 1C... (only using " 1A... " expression hereinafter) of being arranged in parallel in the shop.Each show window 1A... comprises: an evaporimeter 2A...; One show window controller 34A... is used for controlling and switches on and off the refrigerant that flows to evaporimeter 34A...; One as moving a magnetic valve (not shown) and the sensor 14A... who measures from show window blow out air temperature that terminal flows to switch on and off refrigerant.Elect the blow out air position as in the show window a temperature measuring positions, because it is not deposited the influence of commodity amount, also because the variations in temperature that is caused by controller can full out be shown there.Refrigerator 6 comprises: a compressor 9; One condenser 31; One low pressure sensor 7 and that is used to measure compressor 9 air-breathing refrigerant pressure based on the deviation between measured pressure value and the corresponding setting value, be used for controlling the refrigerator controller 12 that compressor 9 switches on and off.
Evaporimeter 2A... links together abreast, and compressor 9 and controller 31 and parallel connected evaporator series constitute a freeze cycle.Based on the deviation between temperature signal that spreads out of from corresponding temperature sensor 14A and the corresponding setting value, each controller 34A... control switches on and off the refrigerant that flows to corresponding evaporator 2A.Refrigerant flows out through condenser 31 from compressor 9 and flows through each evaporimeter 2A... again or it can not be flowed again, returns compressor 9 then, to finish circulation.As simply illustrating in the drawings, a control signal that obtains from each controller 34A... is input to the prime of corresponding evaporator 2A..., switches on and off (seeing also following Figure 10 in detail) with what the control refrigerant flowed.
Figure 10 is the block diagram that is shown specifically common freeze cycle structure.Freeze cycle comprises: be contained in compressor 9 and freezing machine 31 in the refrigerator 6; Be contained in the evaporimeter 2A in each show window 1A...; Corresponding solenoid valve 33A and corresponding temperature expansion valve 32A....
In show window 1A..., deviation between the temperature value that records according to the blow out air desired temperature with from temperature sensor 14A..., switch on and off the refrigerant that flows to evaporimeter 2A by controller 34A... control and flow, realize the control operation (see figure 9) of this freeze cycle.When promptly if deviate is for just (measured value 〉=setting value), magnetic valve 33A... opens (connection), if and deviate is when bearing (measured value≤setting value), magnetic valve 33A... closes (disconnection), flow to the freezing mobile of evaporimeter 2A... thereby switch on and off, as shown in Figure 9, in refrigerator 6, according to the setting value of compressor 9 air-breathing refrigerant pressure with by the deviation between pressure sensor 7 measured values, by the operation that switches on and off of controller 12 control compressors 9.Promptly when pressure measuring value more than or equal to setting value or less than when setting value, switch on and off compressor 9 respectively.Because this is one to switch on and off control, actual setting value comprises the upper and lower bound of setting value.
The operation of this common show window freeze cycle is described with reference to the time course figure among Figure 11.
(1) 1., because the blow out air temperature value of the show window 1A that temperature sensor 14A (not shown) is measured is less than or equal to setting value (lower limit), magnetic valve 33A is closed (disconnection) by controller 34A (not shown) at time point.In this, because the air-breathing refrigerant force value that the pressure sensor (not shown) is measured is less than or equal to setting value (lower limit), compressor remains static, and the blow out air temperature is tending towards raising.
(2) 2., the blow out air temperature of show window 1A rises, and surpasses setting value (upper limit of setting value), makes magnetic valve 33A open (connection) at time point.Simultaneously, the pressure measuring value of air-breathing refrigerant becomes more than or equal to setting value (upper limit), to start compressor.The blow out air temperature of show window 1B and 1C is also along with rising, and becomes more than or equal to setting value (upper limit) so that magnetic valve 33B and 33C open.Thereby refrigerator cooling show window 1A... is to reduce the blow out air temperature.
(3) 3., at first, the blow out air temperature of show window 1A becomes and is lower than setting value, makes magnetic valve 33A close at time point.Close with rear electromagnetic valve 33B and 33C.
(4) 4., all magnetic valves have all cut out, and a pump realized the step-down operation of bleeding, and are in refrigerant between evaporimeter 2A... and the refrigerator like this and are frozen machine and collect at time point.
(5) 5., the pressure measuring value of air-breathing refrigerant becomes and is less than or equal to setting value (lower limit) and makes compressor stop at time point.
Figure 12 (a) and the operation and the shutdown of compressor (b) are shown respectively, and the temporary transient variation of show window blow out air temperature.In Figure 12 (a), compressor alternately, move and shut down (opening and closing) continuously, in Figure 12 (b), the blow out air temperature is round set point change.Omit the upper and lower bound that setting value is shown here.
Usually, in order to move the freshness of show window and maintenance commodity effectively, the load of show window and the load capacity of refrigerator must balances.The reasonable operation that actual techniques is difficult to exactly, sensing lead practicably, so this equilibrium problem has hindered show window.Therefore, as the solution of a reality, when the load of these show windows surpassed the load capacity of refrigerator, available measurement came fast detecting and eliminates overload on the show window.
Summary of the invention
An object of the present invention is to provide a showcase cooling apparatus, can eliminate overload fast when surpassing the load capacity of refrigerator, thereby keep the freshness of commodity with the load of convenient show window.
The present invention includes: one, two or more show window, be according to the air themperature on the precalculated position in device with set value accordingly between deviation, control by a magnetic valve and to switch on and off the refrigerant that flows to an evaporimeter and flow; One common refrigerator, it constitutes a freeze cycle with show window; And, one is used for controlling the ICU of show window and refrigerator, wherein, ICU comprises that one is used for detecting the overload detection that the show window cooling load surpasses the refrigerator load capacity, and comprise an overload controller, in case overload detection detects the load capacity that cooling load on the show window has surpassed refrigerator, it is by a set-point with in a preset time scope, according to a predetermined priority, be used for accumulating ground rising show window desired temperature.
Overload detector is preferably based on following factor and detects: (a) the relevant pressure setting value of mean value that records within a certain period of time at the air-breathing refrigerant pressure of refrigerator inner conversion device compressor and relevant controlling converter compressor revolution, (b) a magnetic valve operation ratio, it is that the interior magnetic valve of relevant scope preset time is opened the ratio of time, and one accordingly setting value (mean value of for example surveying the operation ratio be based on each magnetic valve has surpassed corresponding this fact of setting value, or surpassed this fact of corresponding setting value based on the operation ratio of a magnetic valve designation number), or (c) in device the air themperature (a for example air blow-off outlet) of pre-position with set value accordingly between the designated value of deviation surpassed predetermined value.
Priority is preferably according to following factor and designated: (a) number of show window device, (b) show window need cool off the ascending of necessary degree, or (c) all press same order for all show windows, or (d) when detecting the show window overload with corresponding setting value, press the ascending of the magnetic valve operation ratio of show window according to each magnetic valve operation ratio.
Therefore, the present invention can the operating overload checkout gear have surpassed the load capacity of refrigerator with the chilled load that detects show window.Can also pass through a set-point in the certain hour scope by the operating overload control device, accumulate the desired temperature of ground rising show window, wherein, set-point must can make within the scope that keeps the commodity freshness.Therefore overloading control device also can be used to eliminate overload.
Overload is a basis: (a) mean value that records in the scope in preset time at the air-breathing refrigerant pressure of refrigerator inner conversion device compressor has surpassed setting value, (b) each magnetic valve operation ratio, (for example average operation ratio of each magnetic valve or the operation ratio of a given number of magnetic valve at least) surpassed setting value, or (c) in device the air themperature (a for example air blow-off outlet) of pre-position with accordingly set value between deviation surpassed that predetermined value detects.
In addition, by a set-point with in a preset time scope, overload controller is used for accumulation ground rising show window desired temperature, and wherein designated value must can keep in the scope of freshness commodity.Priority is a basis: (a) number of show window device (for example order of discharging by their), (b) press the ascending of the required cooling degree of show window, (c) all press same order for all show windows, or, press the ascending of the magnetic valve operation ratio of show window (d) when detect show window when overload according to the magnetic valve operation ratio.
According to the present invention, can obtain following Expected Results.
(1) can reasonably control the operation of refrigerator by overload detection and control (eliminating operation) for " overload " indicated on indicator.Therefore, the present invention can deal with the variation of environment temperature or humidity, and will require to reduce to minimum to the refrigerator load capacity, thereby has reduced the cost of device, and can keep the freshness of commodity.
(2) overload is detected according to following factor: (a) mean value that records in the scope in preset time of the air-breathing refrigerant pressure of a converter compressor has surpassed setting value, (b) each magnetic valve operation ratio, the for example average operation ratio of each magnetic valve or the operation ratio of a given number of magnetic valve at least, surpassed setting value, or (c) in device the air themperature (a for example air blow-off outlet) of pre-position with set value accordingly between deviation surpassed predetermined value.Therefore, can simply and practically use all these overload detection methods, and can select only method according to general situation.
(3) provide overload control according to a predetermined priority, and with the interior set-point of scope preset time, the desired temperature of the show window that raises.Priority puts in order normally according to (a), for example, use the number of show window device, (b) ascending of the required cooling degree of show window, (c) all press same order for all show windows, or (d) press the ascending of the magnetic valve operation ratio of show window, especially when detecting the show window overload according to the magnetic valve operation ratio.Therefore, can simply and practically use all these overload controlling methods, and can select only method according to general situation.
Description of drawings
Fig. 1 is the block diagram that the first embodiment of the invention structure is shown;
Fig. 2 is the block diagram that is shown specifically first embodiment, one ICU internal structure;
Fig. 3 is the block diagram that the second embodiment of the invention structure is shown;
Fig. 4 is the block diagram that is shown specifically second embodiment, one ICU internal structure;
Fig. 5 is the block diagram that is shown specifically second embodiment, one ICU modified internal structure;
Fig. 6 is the block diagram that the third embodiment of the invention structure is shown;
Fig. 7 is the block diagram that is shown specifically the 3rd embodiment one ICU internal structure;
Fig. 8 is the block diagram that a compressor revolution command calculations portion and a refrigerator structure are shown;
Fig. 9 is the block diagram that an ordinary construction is shown;
Figure 10 is the block diagram that is shown specifically a common freeze cycle structure;
Figure 11 is the time course figure that common freeze cycle operation is shown;
Figure 12 a is the time course figure when compressor start and shutdown are shown; With
Figure 12 b is the time course figure that the blow out air temperature is shown.
The specific embodiment
Two embodiment of the present invention describe with reference to the block diagram that their each self-structures are shown.Fig. 1 is the block diagram that first example structure is shown.Fig. 2 is the block diagram that is shown specifically an ICU internal structure.In Fig. 1, an ICU 35 identical with the controller of prior art is installed between a show window group 1 and the refrigerator 6, so that control show window and refrigerator comprehensively, effectively.ICU 35 comprises an overload detection portion 43, an overload control part 46 and a revolution command calculations portion 5.The load capacity that the show window cooling load has surpassed refrigerator detects in overload detection portion 43, and finishes a detecting operation in the scope in preset time.According to a predetermined priority, by the set-point in the preset time scope, raise the cumulatively desired temperature of show window of overload control part 46, wherein, in case the cooling load of show window surpasses the load capacity of refrigerator, set-point must be in the scope that can keep the commodity freshness.Thereby overload control part 46 can be eliminated overload.According to the air-breathing refrigerant pressure set points of compressor 9 and the deviation between an actual pressure signal (by the pressure of pressure sensor 7 mensuration), revolution command calculations portion 5 measures the revolution instruction (renewal) that is sent to compressor 9.
In Fig. 2, overload detection portion 43 comprises a pressure mean values calculating part 50 and a comparing section 51.According to the pressure signal that transmits from pressure sensor 7 (pressure of inspiration(Pi) of a converter compressor), pressure mean values calculating part 50 can be measured the pressure mean values that measures in the certain hour.Comparing section 51 compares the pressure set points in the pressure mean values that measures in the scope preset time and each scope preset time, when the mean value overpressure sets value, assert that just (mensurations) transship, and exports a detection signal.Overload control part 46 comprises an instruction department 56 and a preferential configuration part 57.According to detection signal, by the set-point in the preset time scope, instruction department 56 sends instruction, so that the show window desired temperature that raises following cumulatively.Set-point must be in the scope that can keep the commodity freshness.Preferential configuration part 57 predetermined instructions send signal show window priority, and priority is normally by the number of show window device, perhaps when cooling when slightly reduction being arranged, by the ascending of the required cooling degree of the show window ascending of commodity freshness adverse effect size (that is, to) decision.An example of this order is " vegetables and a fruit ", is " articles for daily use " and " fresh fish and meat " then.Cumulatively, constantly the raise desired temperature of show window of instruction department 56 for example, in case detect above-mentioned overload, according to a predetermined priority, raise 1 ℃ in per 15 minutes.In this case, in the preset time scope, the temperature of the temperature of a show window or two show windows can continue to raise.The setting of priority is depended in this operation.In addition, the set temperature value of all show windows can only improve 1 ℃ simultaneously in three hours.Eliminated overload in case eliminate operation, in ensuing testing process, will stop sending detection signal, also will stop sending command signal from overload control part 56 from comparing section 51 according to the overload of this command signal.
Describe the revolution command calculations portion 5 relevant with compressor 9 with reference to the block diagram among Fig. 8, it illustrates the structure of revolution command calculations portion 5 and refrigerator 6.Revolution command calculations portion 5 comprises that one measures the deviation device (being represented by a circle) and a PID calculator 10 of deviation between the force value that pressure set points and records by refrigerator 6 pressure sensors 7 in the drawings.Convert this pressure divergence to a revolution instruction that enters compressor by PID calculator 10, and then its transmission is entered compressor 9, thereby changed the revolution of compressor by a converter 8 in refrigerator 6 sides.By pressure sensor 7, the force value of air-breathing refrigerants is fed the deviation device to the revolution Command Arithmetic Unit 5 in the compressor 9, thereby forms negative-feedback control circulation, to obtain the setting value of an input pressure.Control the revolution of compressor in such a way, when making pressure set points rise, its mean value descends, and pressure set points when descending its mean value rise.
With reference to Fig. 3 to Fig. 5 second embodiment and its variation are described.Fig. 3 is the block diagram that second example structure is shown.Fig. 4 is the block diagram that is shown specifically second embodiment, one ICU internal structure.In Fig. 3, an ICU 36 comprises an overload detection portion 44, an overload control part 47 and a revolution command calculations portion 5.In Fig. 4, overload detection portion 44 comprises an operation ratio calculating part 52, an operation ratio mean value calculation portion 53 and a comparing section 54.Overload control part 47 comprises an instruction department 56 and a preferential specifying part 58.In case received the magnetic valve run signal that slave controller 34A... exports show window 1A... (see figure 3) to, operation ratio calculating part 52 is just measured operation ratio in each of the scope turn-on time of the corresponding magnetic valve of scope preset time (for example, with) preset time.According to each operation ratio, operation ratio mean value calculation portion 53 measures its mean value.Comparing section 54 compares operation ratio mean value and corresponding setting value, if mean value above setting value, detects to overload and transmits a detection signal.In case received each operation ratio of being measured by operation ratio calculating part 52, priority specifying part 58 is according to the ascending of their operation ratio appointment show window, the i.e. ascending of the available load capacity of each refrigerator.In case receive detection signal, according to their operation ratio that passes over from priority specifying part 58, order according to show window, operation part 56 outputs one command signal, an i.e. instruction by the set-point rising show window desired temperature in the preset time scope, and this set-point must can make commodity keep in the fresh scope.Do not eliminate overload yet if in a preset time scope, (for example send back 30 minutes of instruction), according to their priority, will constantly, send identical command signal to accumulation to show window.If in overload detection process afterwards, eliminated overload, will stop output instruction signal.
To the explanation that makes an explanation of the variation example of ICU (ICU 37), Fig. 5 at length shows its internal structure with reference to the block diagram among Fig. 5.An overload detection portion 45 comprises an operation ratio calculating part 52, a comparing section 54 and a detection unit 55 in Fig. 5.Export the magnetic valve run signal of each show window 1A... in case receive a slave controller 34A..., as mentioned above, operation ratio calculating part 52 is measured operation ratio.Comparing section compares operation ratio and corresponding setting value, if operation ratio surpasses setting value, exports a signal.When the number of signals from comparing section 54 outputs becomes more than or equal to predetermined value, for example, exported a signal (operation ratio of a show window has surpassed corresponding setting value), detection unit 55 is determined overload and is exported a detection signal.When not being a show window but the operation ratio of at least two show windows when having surpassed setting value, can determine overload, and output detection signal.Transship the operation of control part 47 the same with described in Fig. 4 in this case, so omit explanation here to it.
With reference to Fig. 6 of the block diagram that the third embodiment of the invention structure is shown, describe Fig. 7 of the block diagram of an ICU internal structure in detail, the 3rd embodiment is described.In Fig. 6, an ICU 38 is installed between show window group 1 and the refrigerator 6.ICU 38 comprises an overload detection portion 48, an overload control part 46 and a revolution command calculations portion 5, and these parts are identical with parts among first embodiment.Following will describe in detail such, according to having surpassed predetermined value by being arranged on the deviation that exists between detected air themperature of each temperature sensor 14A... on the given position in the device (a for example air blow-off outlet) and the corresponding setting value, overload detection portion 48 finishes detection in each given time range.As mentioned above, overload control part 46 and revolution command calculations portion 5 all with first embodiment in identical, so omitted description of them here.
Claims (10)
1. showcase cooling apparatus, it comprises one, two or more show window, be according to the air themperature on the precalculated position in device with set value accordingly between deviation, control by a magnetic valve and to switch on and off the refrigerant that flows to an evaporimeter and flow; One common refrigerator, it constitutes a freeze cycle with show window; And, one is used for controlling the ICU of show window and refrigerator, it is characterized in that, ICU comprises that one is used for detecting the overload detection that the show window cooling load surpasses the refrigerator load capacity, and comprise an overload controller, in case overload detection detects the load capacity that cooling load on the show window has surpassed refrigerator, this overload controller is by a set-point with in a preset time scope, according to a predetermined priority, be used for accumulating ground rising show window desired temperature.
2. a showcase cooling apparatus as claimed in claim 1, it is characterized in that the detection of overload detection is that mean value that the air-breathing refrigerant pressure according to refrigerator inner conversion device compressor recorded in the scope in preset time sets value with the relevant pressure relevant with control change device compressor revolution that provides and realizes in this period.
3. a showcase cooling apparatus as claimed in claim 1, it is characterized in that, the detection of overload detection be the root a tree name by with respect to preset time scope the magnetic valve operation ratio that limits of the magnetic valve time of opening and realize with the corresponding setting value of magnetic valve operation ratio.
4. a showcase cooling apparatus as claimed in claim 3 is characterized in that, the detection of overload detection is to realize above corresponding this fact of setting value according to the mean value of each magnetic valve operation ratio.
5. a showcase cooling apparatus as claimed in claim 3 is characterized in that, the detection of overload detection is that the operation ratio according to a magnetic valve designation number has surpassed this fact of corresponding setting value and realizes.
6. a showcase cooling apparatus as claimed in claim 1 is characterized in that, the detection of overload detection is to have surpassed this fact of predetermined value according to the designated value of deviation between the air themperature of pre-position in device and the corresponding setting value to realize.
7. a showcase cooling apparatus as claimed in claim 1 is characterized in that, priority is to determine according to the number of show window device.
8. a showcase cooling apparatus as claimed in claim 1 is characterized in that, priority is to determine according to the ascending of the required cooling degree of show window.
9. a showcase cooling apparatus as claimed in claim 1 is characterized in that all show windows are all accepted identical priority.
10. a showcase cooling apparatus as claimed in claim 1 is characterized in that, priority is that the ascending by the magnetic valve operation ratio of show window is determined when detecting the show window overload according to magnetic valve operation ratio and corresponding setting value.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP268212/96 | 1996-10-09 | ||
| JP26821296 | 1996-10-09 | ||
| JP268212/1996 | 1996-10-09 | ||
| JP032518/97 | 1997-02-18 | ||
| JP03251897A JP3658911B2 (en) | 1996-10-09 | 1997-02-18 | Showcase cooling system |
| JP032518/1997 | 1997-02-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1179531A CN1179531A (en) | 1998-04-22 |
| CN1123750C true CN1123750C (en) | 2003-10-08 |
Family
ID=26371116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97120540A Expired - Fee Related CN1123750C (en) | 1996-10-09 | 1997-10-08 | Showcase cooling apparatus |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP3658911B2 (en) |
| KR (1) | KR19980032635A (en) |
| CN (1) | CN1123750C (en) |
| HK (1) | HK1009843A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100392304B1 (en) * | 2001-08-04 | 2003-07-22 | 주식회사 헬쯔테크 | Temperature control device of showcase using compressor of sucking pressure and meothed thereof |
| JP4096862B2 (en) * | 2003-11-06 | 2008-06-04 | 松下電器産業株式会社 | Refrigeration unit and refrigerator |
| JP4568184B2 (en) * | 2005-07-07 | 2010-10-27 | 三洋電機株式会社 | Showcase control device and showcase central control device |
| JP5758749B2 (en) * | 2011-09-05 | 2015-08-05 | 三菱電機株式会社 | Refrigeration / refrigeration system |
| JP6634705B2 (en) * | 2015-06-01 | 2020-01-22 | 富士電機株式会社 | Cooling device monitoring device and cooling device monitoring method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5379608A (en) * | 1992-03-24 | 1995-01-10 | Fuji Electric Co., Ltd. | Defrosting control unit for showcases |
| JPH08110144A (en) * | 1994-10-11 | 1996-04-30 | Fuji Electric Co Ltd | Air-cooled conditioning unit for showcase having built-in refrigerating machine |
-
1997
- 1997-02-18 JP JP03251897A patent/JP3658911B2/en not_active Expired - Lifetime
- 1997-10-08 KR KR1019970051492A patent/KR19980032635A/en not_active Application Discontinuation
- 1997-10-08 CN CN97120540A patent/CN1123750C/en not_active Expired - Fee Related
-
1998
- 1998-09-16 HK HK98110655A patent/HK1009843A1/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5379608A (en) * | 1992-03-24 | 1995-01-10 | Fuji Electric Co., Ltd. | Defrosting control unit for showcases |
| JPH08110144A (en) * | 1994-10-11 | 1996-04-30 | Fuji Electric Co Ltd | Air-cooled conditioning unit for showcase having built-in refrigerating machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10170121A (en) | 1998-06-26 |
| JP3658911B2 (en) | 2005-06-15 |
| CN1179531A (en) | 1998-04-22 |
| KR19980032635A (en) | 1998-07-25 |
| HK1009843A1 (en) | 1999-06-11 |
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