CN112413973B - Control method of refrigerated cabinet and refrigerating system - Google Patents
Control method of refrigerated cabinet and refrigerating system Download PDFInfo
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- CN112413973B CN112413973B CN202011345774.XA CN202011345774A CN112413973B CN 112413973 B CN112413973 B CN 112413973B CN 202011345774 A CN202011345774 A CN 202011345774A CN 112413973 B CN112413973 B CN 112413973B
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- refrigerated
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000005057 refrigeration Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims description 15
- 230000003993 interaction Effects 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000003507 refrigerant Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000013500 data storage Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
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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
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
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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
- F25D29/003—Arrangement or mounting of control or safety devices for movable devices
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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
- F25D29/005—Mounting of control devices
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a control method of a refrigerated cabinet and a refrigeration system, wherein a plurality of refrigerated cabinets share a condensing unit, the condensing unit comprises a variable frequency compressor, the amount of cold quantity required by the refrigerated cabinets is determined according to the difference value between the actual temperature and the target temperature of the refrigerated cabinets, the difference value between the actual temperature and the target temperature of each refrigerated cabinet is continuously detected for a plurality of times, the average value of the difference values of the actual temperature and the target temperature detected for a plurality of times is taken for comparison, and the running frequency of the compressor is adjusted according to the average value of the refrigerated cabinet with the largest cold quantity required by the plurality of refrigerated cabinets in running; when the condensing unit breaks down and does not stop for protection, the refrigerated cabinet normally operates; when the condensing unit breaks down and stops, the fault code is displayed on a human-computer interaction interface; when the required cooling capacity cannot be obtained, the compressor is operated at a preset frequency. Compared with the prior art, the invention can achieve the accurate control of the temperature of each refrigerated cabinet; meanwhile, compared with the single-frequency operation of the compressor, the energy is greatly saved.
Description
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a control method of a refrigerated cabinet and a refrigeration system.
Background
At present, most show case manufacturers on the market do not set a matched condensing unit for show cases, a plurality of cold storage cases generally share one condensing unit, the matching of each show case and the condensing unit has more problems, the target temperature and the refrigerating capacity required by each show case are different, the refrigerating flow and the total refrigerating capacity required by each show case are difficult to be consistent, the problem that an internal machine and an external machine in the prior art are not matched exists, the show cases are easy to have more abnormity in the operation process, the power consumption is large, the energy is not saved enough, and the economic loss of users can be caused in serious cases.
Disclosure of Invention
The invention provides a control method of a refrigerated cabinet and a refrigeration system, which solve the problems of mismatching of refrigeration capacity of each refrigerated cabinet and a condensing unit, large power consumption and the like in the prior art.
The technical scheme adopted by the invention is as follows: a control method of a refrigerated cabinet is characterized in that a plurality of refrigerated cabinets share one condensing unit, the condensing unit comprises a variable frequency compressor, and the operation frequency of the compressor is adjusted according to the operation parameters of the refrigerated cabinet with the maximum cooling capacity in the plurality of refrigerated cabinets in operation.
Further, the amount of cold required by the refrigerated cabinet is determined according to the difference value between the actual temperature and the target temperature of the refrigerated cabinet.
And further, comparing the difference value of the actual temperature and the target temperature of each refrigerated cabinet, and adjusting the operating frequency of the compressor according to the operating parameter of the refrigerated cabinet with the largest temperature difference value.
Furthermore, the difference value between the actual temperature and the target temperature of each refrigerated cabinet is continuously detected for multiple times, and the average value of the difference values between the actual temperature and the target temperature detected for multiple times is taken for comparison.
Further, every first preset time t1And detecting the difference value between the actual temperature of the refrigerated cabinet and the target temperature once.
Further, the first preset time t1Is 1 s.
Further, the operation parameter is an average value of differences between the actual temperature and the target temperature obtained by at least one continuous detection of the refrigerated cabinet.
And further, performing PID algorithm control to adjust the running frequency of the compressor according to the average value of the difference value between the actual temperature and the target temperature.
Further, every second preset time t2Adjusting the operating frequency of the compressor once.
A refrigerating system comprises a plurality of refrigerated cabinets, a condensing unit and a controller, wherein the controller adopts the control method.
Furthermore, the controller is connected with the refrigerated cabinet and the condensing unit, and the controller comprises a human-computer interaction interface arranged indoors and a detection module for detecting the running condition of the condensing unit.
Further, when the detection module detects that the condensing unit breaks down and does not stop to protect, the controller controls the normal operation of the refrigerated cabinet.
Further, when the detection module detects that the condensing unit is in fault shutdown, the controller displays a fault code on the human-computer interaction interface.
Further, when the controller cannot calculate the cooling capacity required in the refrigerated cabinet, the controller controls the compressor to operate at a preset frequency.
Compared with the prior art, the operation frequency of the compressor is adjusted through the operation parameters of the refrigerated cabinets which need the most cold, so that the total cold required by all the refrigerated cabinets is enough, the operation frequency of the compressor is enough to meet the cold use requirement of each refrigerated cabinet, and the operation frequency of the compressor is adjusted according to the operation parameters of the refrigerated cabinets which need the most cold in continuous change because the actual temperature of each refrigerated cabinet in operation is continuously changed, thereby achieving the accurate control of the temperature of each refrigerated cabinet; meanwhile, compared with the single-frequency operation of the compressor, the energy is greatly saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic block diagram of the construction of a refrigeration system according to the present invention;
FIG. 2 is a schematic block diagram of the construction of various chiller cabinet systems of the present invention;
FIG. 3 is a control flow chart of a method of controlling a refrigerated merchandiser of the present invention;
FIG. 4 is a schematic block diagram of the operation of the refrigeration system in the event of a failure of the outdoor unit of the present invention;
fig. 5 is a schematic block diagram of the operation of the refrigeration system in the event of a communication failure in accordance with the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The application provides a control method of a refrigerated cabinet and a refrigeration system using the control method.
As shown in fig. 1, the refrigeration system in the present application mainly includes a plurality of refrigerated cabinets 1, each refrigerated cabinet 1 is connected to a condensing unit 2, each condensing unit 2 is an outdoor unit, and the plurality of refrigerated cabinets 1 are connected in parallel and disposed indoors, each refrigerated cabinet 1 is an indoor unit, and its basic operating principle is: the condensing unit 2 conveys the cold media with cold quantity to each refrigerating cabinet 1 through pipelines, each refrigerating cabinet 1 is distributed with a certain amount of cold media for discharging the cold quantity, and the cold media discharged from each refrigerating cabinet 1 are conveyed back to the condensing unit 2 through pipelines to complete circulation.
The condensing unit 2 comprises a compressor, and the compressor adopts a variable frequency compressor to change a high-pressure refrigerant into a low-pressure refrigerant.
As shown in fig. 2, each of the refrigerated cabinets 1 mainly includes an evaporator 11, a fan 12, an electronic expansion valve 13, a filter 14, and an electromagnetic valve 15, and the refrigerant sent from the condensing unit 2 is adjusted in input amount by the electromagnetic valves in the respective pipelines of the refrigerated cabinet 1, so as to achieve the purpose of matching different refrigeration temperatures, and at the same time, the control accuracy is high, thereby avoiding the problem of energy waste caused by the operation of the compressor at a single frequency.
And a temperature sensor 16 is also provided in the cabinet 1 for sensing the actual temperature of the cabinet 1.
As shown in fig. 3, the method for controlling a refrigerator disclosed in the present application mainly adjusts the operation frequency of the compressor according to the operation parameters of the refrigerator 1 requiring the most cooling capacity among the plurality of refrigerators 1 in operation, and adjusts the operation frequency of the compressor according to the refrigerator 1 requiring the most cooling capacity, so that the operation frequency of the compressor is sufficient to meet the use requirements of each refrigerator 1, and since the actual temperature of each refrigerator in operation is changed, the operation frequency of the compressor is adjusted according to the cooling capacity required by the changing refrigerator, the accurate control of the temperature of each refrigerator 1 can be achieved.
In the present embodiment, the amount of cooling required by the refrigerator 1 during operation is determined by the difference between the actual temperature and the target temperature of the refrigerator 1, because the difference is the operation parameter value which most directly reflects the amount of cooling required by the refrigerator 1, the detection accuracy is high, and the adjustment is fast.
The maximum cooling capacity required by the refrigerated cabinets 1 is directly determined by comparing the temperature difference value of each refrigerated cabinet 1, and the running frequency of the compressor is adjusted according to the running parameter of the refrigerated cabinet with the maximum temperature difference between the actual temperature and the target temperature.
Specifically, during the operation of the refrigerated cabinet 1, the difference between the actual temperature and the target temperature of the refrigerated cabinet 1 is continuously detected for a plurality of times, and the average temperature difference (hereinafter referred to as the average value) is calculated according to a plurality of groups of obtained differences, where the average value is a comparison main body of comparing the sizes of the refrigeration capacities of the refrigerated cabinets 1 in each group, that is, the refrigeration capacity required by the refrigerated cabinet 1 with the largest average value is the largest.
Preferably, when the difference between the actual temperature and the target temperature of the refrigerated cabinet 1 is continuously detected for a plurality of times, the time interval between two consecutive detections is the first preset time t1(ii) a In this embodiment, the first predetermined time value t1Taking 1s, namely detecting the temperature difference value of the refrigerated cabinet 1 once per second; in addition, in this embodiment, the temperature difference value of the refrigerated cabinet 1 detected for 5 times is obtained continuously, and the cold quantity actually required by the refrigerated cabinet 1 is ensured to be obtained as much as possible by means of a plurality of sampling detection average values, so that the influence of other factors on the temperature is reduced.
In this embodiment, the operation parameter for adjusting the operation frequency of the compressor is also the temperature difference, and the operation parameter is specifically the average value, that is, the maximum cooling capacity required by each refrigerator is obtained by comparing the average value of the temperature difference, and the operation frequency of the compressor is adjusted according to the average value of the obtained maximum cooling capacity of the refrigerator, and the adjustment of the operation frequency of the compressor can be controlled according to a PID algorithm.
The method specifically comprises the following steps: compressor frequency range [ F (l), F (h) ],
increasing the proportion: pn = Kp Δ Tmax — n;
integral increment: in = In-1+ Ki Δ Tmax — n;
differential increment: dn = Kd/(Δ Tmax _ n-1);
the difference between the calculated frequency of the compressor and the calculated frequency of the compressor at the previous time is as follows: Δ F (n) = F (n-1) = Kp (Δ Tmax _ n-1) + Ki × Δ Tmax _ n + Kd/(Δ Tmax _ n-2 Δ Tmax _ n-1+ Δ Tmax _ n-2);
wherein: kp, Ki and Kd are set according to parameters; Δ Tmax is the maximum temperature difference value (mean).
And changing the running frequency of the compressor according to the obtained compressor frequency difference.
Preferably, every second preset time t is used in the present application2The second preset time t in the embodiment is adjusted once for the operating frequency of the compressor2Is 5-10 s.
The detection of 1 difference in temperature of each freezer in this application can be: every first preset time t1Detecting the actual temperature of the refrigerated cabinet 1 in real time, calculating the difference value between the actual temperature and the target temperature, transmitting the detected difference value to an external machine controller of the condensing unit every time, and enabling the external machine controller to control the temperature at intervals of second preset time t2In order to adjust the operating frequency of the primary compressor.
The refrigeration system provided by the application further comprises a controller, the controller further comprises an outer machine controller (used for a condensing unit) and an inner machine controller (used for the refrigerated cabinets), the inner machine controller receives actual temperature values of the refrigerated cabinets 1 in real time and feeds the actual temperature values back to the outer machine controller, the outer machine controller calculates and compares average values of the refrigerated cabinets 1, the outer machine controller controls the running frequency of the compressor according to the maximum average value, the total cooling capacity required by all the refrigerated cabinets 1 is ensured to be sufficient firstly, meanwhile, the inner machine controls the opening degree of the electromagnetic valve 15 of each refrigerated cabinet 1 to adjust the cooling capacity required by each refrigerated cabinet 1, and accurate distribution of the cooling capacity required by each refrigerated cabinet is ensured in such a mode.
Further, as shown in fig. 4 and 5, the internal controller of the present application further includes a human-computer interaction interface (display screen), and the external controller further includes a detection module for detecting an operation status of the condensing unit, and when the condensing unit in the present application fails or is protected, the external controller feeds back a fault signal and a fault code to the human-computer interaction interface of the internal controller, and the internal controller performs corresponding processing.
Further, when the detection module detects that the condensing unit 2 breaks down and does not stop to protect, the internal machine controller controls the normal operation of the refrigerated cabinet 1, so that the refrigerated cabinet is prevented from being interfered, and the normal operation of the refrigerated cabinet is ensured; and when the detection module detects that the condensing unit 2 is out of order and shut down, the internal machine controller displays the fault code on the man-machine interaction interface, so that the problem of inconvenient maintenance caused by the installation position of the condensing unit is solved, and the fault of the system is displayed on the internal machine controller, thereby greatly facilitating the communication and facilitating the professional to check and maintain the fault.
When the temperature data between the internal and external controllers cannot be transmitted, namely the controller cannot calculate the required cooling capacity in the refrigerated cabinet due to faults, the external controller controls the compressor to operate at the preset frequency to ensure the normal operation of the refrigeration system.
Meanwhile, the internal machine controller also has the functions of automatically recording the temperature of the refrigerated cabinet, checking the temperature in real time, downloading the cabinet temperature in one key mode, checking historical faults and the like; the external machine controller can also be provided with a display, enters a parameter interface according to the password, changes equipment parameters and is convenient to operate. Meanwhile, the inner machine controller and the outer machine controller can also be remotely connected with the outer machine controller to monitor all parameters of the inner machine and the outer machine, so that data storage and after-sale analysis and processing are facilitated.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A control method of a refrigerated cabinet is characterized in that a plurality of refrigerated cabinets share one condensing unit, the condensing unit comprises a variable frequency compressor, a controller is connected with the refrigerated cabinets and the condensing unit, the controller comprises a detection module for detecting the operation condition of the condensing unit, the control method is characterized in that the amount of cold energy required by the refrigerated cabinets is determined according to the difference value of the actual temperature and the target temperature of the refrigerated cabinets, the difference value of the actual temperature and the target temperature of each refrigerated cabinet is compared, the operation frequency of the compressor is adjusted according to the operation parameter of the refrigerated cabinet with the largest temperature difference value, and when the detection module detects that the condensing unit breaks down and does not stop to protect, the controller controls the refrigerated cabinets to normally operate.
2. The control method of claim 1, wherein the difference between the actual temperature and the target temperature of each of the refrigerated cabinets is continuously detected for a plurality of times, and the average of the differences between the actual temperature and the target temperature detected for the plurality of times is taken for comparison.
3. The control method according to claim 2, wherein the difference between the actual temperature of the refrigerated cabinet and the target temperature is detected every first preset time t 1.
4. The control method according to claim 3, characterized in that the first preset time t1 is 1 s.
5. The control method according to claim 1, wherein the operating parameter is an average value of the difference between the actual temperature and the target temperature obtained from at least one successive detection of the refrigerated cabinet.
6. The control method according to claim 5, wherein the operating frequency of the compressor is controlled and adjusted by a PID algorithm based on an average value of the difference between the actual temperature and the target temperature.
7. The control method according to claim 1, characterized in that the operating frequency of the compressor is adjusted once every second preset time t 2.
8. The control method according to claim 1, wherein the controller further comprises a human-machine interface arranged indoors, and when the detection module detects that the condensing unit is out of work, the controller displays a fault code on the human-machine interface.
9. The control method according to claim 1, wherein the controller controls the compressor to operate at a preset frequency when the controller cannot calculate the cooling capacity required in the refrigerator.
10. A refrigeration system comprising a plurality of refrigerated cabinets, a condensing unit and a controller, wherein the controller employs the control method of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011345774.XA CN112413973B (en) | 2020-11-25 | 2020-11-25 | Control method of refrigerated cabinet and refrigerating system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011345774.XA CN112413973B (en) | 2020-11-25 | 2020-11-25 | Control method of refrigerated cabinet and refrigerating system |
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| Publication Number | Publication Date |
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| CN112413973A CN112413973A (en) | 2021-02-26 |
| CN112413973B true CN112413973B (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011345774.XA Active CN112413973B (en) | 2020-11-25 | 2020-11-25 | Control method of refrigerated cabinet and refrigerating system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114234549A (en) * | 2021-12-23 | 2022-03-25 | 珠海格力电器股份有限公司 | Refrigeration equipment, control method thereof, storage medium and processor |
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