CN117387279B - Ultralow-temperature refrigeration house, defrosting system of low-temperature refrigeration house and defrosting method - Google Patents
Ultralow-temperature refrigeration house, defrosting system of low-temperature refrigeration house and defrosting method Download PDFInfo
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- CN117387279B CN117387279B CN202311708793.8A CN202311708793A CN117387279B CN 117387279 B CN117387279 B CN 117387279B CN 202311708793 A CN202311708793 A CN 202311708793A CN 117387279 B CN117387279 B CN 117387279B
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 152
- 238000010257 thawing Methods 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims abstract description 32
- 239000003507 refrigerant Substances 0.000 claims description 62
- 230000001276 controlling effect Effects 0.000 claims description 31
- 238000005485 electric heating Methods 0.000 claims description 23
- 238000011217 control strategy Methods 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 2
- 235000013305 food Nutrition 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 235000015243 ice cream Nutrition 0.000 description 2
- 235000014102 seafood Nutrition 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 239000003205 fragrance Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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
- F25D13/00—Stationary devices, e.g. cold-rooms
- F25D13/02—Stationary devices, e.g. cold-rooms with several cooling compartments, e.g. refrigerated locker systems
- F25D13/04—Stationary devices, e.g. cold-rooms with several cooling compartments, e.g. refrigerated locker systems the compartments being at different 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/004—Control mechanisms
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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
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
Abstract
The invention provides an ultralow temperature refrigeration house, a defrosting system of the ultralow temperature refrigeration house and a defrosting method, wherein the defrosting system is used for communicating a second air cooler of the ultralow temperature refrigeration house with a first air cooler of the ultralow temperature refrigeration house and a first condenser, and defrosting the ultralow temperature refrigeration house through an electric heater communicated between the first condenser and the first air cooler while defrosting the ultralow temperature refrigeration house through the electric heater, so that the problem of difficult defrosting of the ultralow temperature refrigeration house in the prior art is solved, and user experience is improved.
Description
Technical Field
The invention relates to the technical field of intelligent control, in particular to an ultralow-temperature refrigeration house, a defrosting system of the ultralow-temperature refrigeration house and a defrosting method.
Background
The storage temperature of the low-temperature refrigeration storage is generally: -25 to-35 ℃. Some foods such as: ice cream and seafood food need to be preserved at-25deg.C without deterioration, for example, ice cream can propagate bacteria when being stored at-35deg.C, and its fragrance is not present; the seafood food has poor flavor and taste when the temperature of minus 35 ℃ is not reached.
The refrigeration house with the temperature ranging from minus 40 ℃ to minus 60 ℃ is generally called an ultralow temperature refrigeration house, and the refrigeration house is mainly used for medical science and special fresh-keeping requirements of some foods, for example, tuna meat quality can be kept delicious under the condition of the ultralow temperature refrigeration house.
Meanwhile, when the refrigerator is provided with a low-temperature refrigerator and an ultralow-temperature refrigerator, the low-temperature refrigerator and the ultralow-temperature refrigerator are required to be defrosted irregularly, but in the prior art, the defrosting is performed by heating and defrosting by using electricity, firstly, the refrigerator temperature fluctuation is large, the defrosting time is long, and the quality of goods of the ultralow-temperature refrigerator is influenced.
Disclosure of Invention
The invention aims to overcome the technical defects and provide a defrosting system and a defrosting method for an ultralow-temperature refrigeration house and a low-temperature refrigeration house, so as to solve the problem that defrosting of the ultralow-temperature refrigeration house is difficult in the related art.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
According to a first aspect of the present invention, there is provided an ultra-low temperature freezer and a defrosting system for a low temperature freezer, comprising:
The first condenser and the second condenser are arranged in the low-temperature refrigeration house, the second air cooler is arranged in the ultralow-temperature refrigeration house, the first condenser and the electric heater are arranged outside the low-temperature refrigeration house, and the electric heater is communicated between the first condenser and the first air cooler and is communicated with the second air cooler;
And the controller is used for adjusting the electric heating power of the electric heater according to the defrosting requirements of the low-temperature refrigeration house and/or the ultra-low-temperature refrigeration house by adopting different control strategies to defrost the first air cooler in the low-temperature refrigeration house and/or the second air cooler in the ultra-low-temperature refrigeration house.
Preferably, a first pipeline is communicated between the refrigerant outlet of the first condenser and the refrigerant inlet of the second air cooler; the refrigerant inlet of the first air cooler is communicated with the first pipeline through a second pipeline;
A third pipeline is communicated between the refrigerant outlet of the second air cooler and the refrigerant inlet of the electric heater; the refrigerant outlet of the first air cooler is communicated with the third pipeline through a fourth pipeline; the refrigerant inlet of the first air cooler is communicated with the third pipeline through a fifth pipeline.
Preferably, a first valve is arranged between the connection point of the second pipeline and the first pipeline and the refrigerant inlet of the second air cooler;
The second pipeline is provided with a second valve, and the interface of the fifth pipeline and the second pipeline is arranged between the second valve and the refrigerant inlet of the first air cooler;
A third valve is arranged on the fifth pipeline;
A fourth valve is arranged between the connection point of the fourth pipeline and the third pipeline and the connection point of the fifth pipeline and the third pipeline;
The first valve, the second valve, the third valve and the fourth valve are all connected with the controller.
Preferably, a first temperature sensor connected with the controller is arranged in the low-temperature refrigerator;
And a second temperature sensor connected with the controller is arranged in the ultralow temperature refrigeration house.
Preferably, a low pressure sensor is arranged at the air suction port of the compressor of the first condenser, and the low pressure sensor is connected with the controller;
The compressor discharge of the first condenser is provided with a high-pressure sensor, and the high-pressure sensor is connected with the controller.
According to a second aspect of the present invention, there is provided an ultra-low temperature refrigerator and a defrosting method of a low temperature refrigerator, comprising:
and according to defrosting requirements of the low-temperature refrigeration house and/or the ultra-low-temperature refrigeration house, adopting different control strategies to adjust the electric heating power of the electric heater, and defrosting the first air cooler in the low-temperature refrigeration house and/or the second air cooler in the ultra-low-temperature refrigeration house.
Preferably, the adjusting the electric heating power of the electric heater according to the defrosting requirements of the low-temperature refrigeration house and/or the ultra-low-temperature refrigeration house by adopting different control strategies comprises:
if only the low-temperature refrigeration house needs defrosting, disconnecting the pipeline connection of the low-temperature refrigeration house and the ultralow-temperature refrigeration house;
controlling the high-temperature refrigerant flowing out of the first condenser to flow into the first air cooler for defrosting, and controlling the low-temperature refrigerant flowing out of the first air cooler to flow back into the first condenser through the electric heater;
detecting a low pressure value at an air suction port of the compressor and a high pressure value at an air discharge port of the compressor in the first condenser;
If the low pressure value is larger than the low pressure protection value, controlling the electric heater to keep a closed state; otherwise, the electric heater is started, the power of the electric heater is regulated according to the low-pressure value and the high-pressure value until the first air cooler reaches the defrosting exit temperature, and the electric heater is closed.
Preferably, the pipeline connection of the low-temperature refrigeration house and the ultralow-temperature refrigeration house is disconnected, specifically:
and controlling the first valve, the third valve and the fourth valve to be closed, and opening the second valve.
Preferably, the turning on the electric heater and adjusting the power of the electric heater according to the low pressure value and the high pressure value includes:
starting the electric heater with first power, wherein the first power is the highest power of the electric heater multiplied by a first preset proportion;
Re-detecting the low pressure value once every preset time;
And if the low pressure value is smaller than a first threshold value, gradually increasing the power of the electric heater from the first power to the highest power according to a first dynamic amplitude until the low pressure value is equal to the first threshold value, wherein the first threshold value is a preset multiple of a low pressure protection value.
Preferably, the defrosting method further comprises:
If the power of the electric heater is gradually increased from the first power to the highest power according to the first dynamic amplitude, the high-pressure value is equal to the second threshold value, the low-pressure value is not judged any more, the power of the electric heater is stopped being increased, and the current power of the electric heater is maintained unchanged; the second threshold is a high voltage protection value multiplied by a first preset scaling factor.
Preferably, the adjusting the electric heating power of the electric heater according to the defrosting requirements of the low-temperature refrigeration house and/or the ultra-low-temperature refrigeration house by adopting different control strategies comprises:
If only the ultralow-temperature refrigeration house needs defrosting, closing the second condenser, starting the first condenser, and communicating the second air cooler with the first condenser and the first air cooler;
controlling the high-temperature refrigerant flowing out of the first condenser to flow into the second air cooler for defrosting, and controlling the low-temperature refrigerant flowing out of the second air cooler to flow into the first air cooler for absorbing heat and refrigerating and then flow back into the first condenser;
detecting a low pressure value at an air suction port of the compressor and a high pressure value at an air discharge port of the compressor in the first condenser;
If the low pressure value is larger than the low pressure protection value, controlling the electric heater to keep a closed state; otherwise, the electric heater is started, the power of the electric heater is regulated according to the low-pressure value and the high-pressure value until the second air cooler reaches the defrosting exit temperature, and the electric heater is closed.
Preferably, the second air cooler is communicated with the first condenser and the first air cooler, specifically;
And controlling the first valve and the third valve to be opened, and controlling the second valve and the fourth valve to be closed.
Preferably, the turning on the electric heater and adjusting the power of the electric heater according to the low pressure value and the high pressure value includes:
Starting the electric heater with a second power, wherein the second power is the highest power of the electric heater multiplied by a second preset proportion;
Re-detecting the low pressure value once every preset time;
And if the low-pressure value is smaller than a first threshold value, gradually increasing the power of the electric heater from the second power to the highest power according to a second dynamic amplitude value until the low-pressure value is equal to the first threshold value, wherein the first threshold value is a preset multiple of a low-pressure protection value.
Preferably, if the power of the electric heater is gradually increased from the second power to the highest power according to the second dynamic amplitude, the high-pressure value is equal to the second threshold value, the magnitude of the low-pressure value is not judged any more, the power of the electric heater is stopped being increased, and the current power of the electric heater is maintained unchanged; the second threshold is a high voltage protection value multiplied by a first preset scaling factor.
Preferably, the adjusting the electric heating power of the electric heater according to the defrosting requirements of the low-temperature refrigeration house and/or the ultra-low-temperature refrigeration house by adopting different control strategies comprises:
If the low-temperature refrigeration house and the ultra-low-temperature refrigeration house both need defrosting, closing the second condenser, starting the first condenser, and communicating the second air cooler with the first condenser and the first air cooler;
The high-temperature refrigerant flowing out of the first condenser is controlled to flow into the first air cooler and the second air cooler respectively for defrosting, and the low-temperature refrigerant flowing out of the first air cooler and the second air cooler is controlled to flow into the electric heater respectively and then flow back into the first condenser;
detecting a low pressure value at an air suction port of the compressor and a high pressure value at an air discharge port of the compressor in the first condenser;
If the low pressure value is larger than the low pressure protection value, controlling the electric heater to keep a closed state; otherwise, the electric heater is started, the power of the electric heater is regulated according to the low-pressure value and the high-pressure value until the first air cooler and the second air cooler reach defrosting exit temperature, and the electric heater is closed.
Preferably, the communicating the second air cooler with the first condenser and the first air cooler specifically includes:
and opening the first valve, the second valve and the fourth valve, and closing the third valve.
Preferably, the opening of the first valve and the second valve is specifically:
respectively detecting the storage temperature of the low-temperature refrigeration storage and the storage temperature of the ultralow-temperature refrigeration storage;
The opening of the first valve is regulated to be the maximum, and the opening of the second valve is calculated according to the opening of a valve of the refrigerator temperature of the low-temperature refrigerator and the refrigerator Wen Jidi of the ultralow-temperature refrigerator;
And controlling the opening degree of the second valve according to the calculated opening degree of the second valve.
Preferably, the turning on the electric heater and adjusting the power of the electric heater according to the low pressure value and the high pressure value includes:
starting the electric heater with third power, wherein the third power is the highest power of the electric heater multiplied by a third preset proportion;
Re-detecting the low pressure value once every preset time;
And if the low-pressure value is smaller than a first threshold value, gradually increasing the power of the electric heater from the third power to the highest power according to a third dynamic amplitude until the low-pressure value is equal to the first threshold value, wherein the first threshold value is a preset multiple of a low-pressure protection value.
Preferably, if the power of the electric heater is gradually increased from the third power to the highest power according to the third dynamic amplitude, the high-pressure value is equal to the third threshold value, the magnitude of the low-pressure value is not judged any more, the power of the electric heater is stopped being increased, and the power of the current electric heater is maintained unchanged; the third threshold is a high-voltage protection value multiplied by a second preset proportionality coefficient.
Preferably, after defrosting is performed for a preset period of time, before the first air cooler and the second air cooler reach defrosting exit temperature, the method further comprises:
If the first air cooler and the second air cooler do not reach the defrosting exit temperature, the control system keeps the current working state;
If only the first air cooler reaches the defrosting exit temperature, the operation is carried out according to the working mode when only the ultralow temperature refrigeration house needs defrosting, the opening of the first valve is maintained to be maximum, the third valve is opened, and the second valve and the fourth valve are closed; when the high-pressure value is larger than or equal to the high-pressure protection value, controlling the power of the electric heater to be adjusted according to the working mode when the ultra-low temperature refrigerator needs defrosting;
If only the second air cooler reaches the defrosting exit temperature, the first valve, the third valve and the fourth valve are closed according to the working mode when only the low-temperature refrigeration house needs defrosting, and the second valve is opened; when the high-pressure value is larger than or equal to the high-pressure protection value, controlling the electric heater to operate according to the working mode when defrosting is needed only for the low-temperature refrigeration house;
If the first air cooler and the second air cooler reach defrosting exit temperature, the first valve, the third valve and the fourth valve are closed, the second valve is opened, and the double-refrigeration mode is entered.
The technical scheme provided by the embodiment of the invention can comprise the following beneficial effects:
The second air cooler of the ultralow temperature refrigeration house is communicated with the first air cooler of the low temperature refrigeration house and the first condenser, and the electric heater between the first condenser and the first air cooler is used for defrosting the low temperature refrigeration house and can defrost the ultralow temperature refrigeration house, so that the problem of difficulty in defrosting the ultralow temperature refrigeration house in the prior art is solved, and user experience is improved.
Drawings
FIG. 1 is a schematic diagram of a defrosting system of an ultra-low temperature freezer and a low temperature freezer according to an exemplary embodiment;
Fig. 2 is a flow chart illustrating an ultra-low temperature freezer and a defrosting method of the low temperature freezer according to an exemplary embodiment.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
In the following embodiments, it should be noted that, in the following embodiments, the third power > the second power > the first power, and the third preset ratio > the second preset ratio > the first preset ratio; the second preset scaling factor is greater than the first preset scaling factor.
Example 1
Fig. 1 is a schematic structural view of a defrosting system of an ultra-low temperature refrigerator and a low temperature refrigerator according to an exemplary embodiment, and as shown in fig. 1, the defrosting system includes:
A first air cooler 11 and a second condenser 22 arranged in a low-temperature cold store A, a second air cooler 21 arranged in an ultralow-temperature cold store B, and a first condenser 12 and an electric heater 13 arranged outside the low-temperature cold store A, wherein the electric heater 13 is communicated between the first condenser 12 and the first air cooler 11 and is communicated with the second air cooler 21;
And the controller (not shown in the drawing) is used for adjusting the electric heating power of the electric heater 13 according to the defrosting requirements of the low-temperature cold store A and/or the ultra-low-temperature cold store B by adopting different control strategies to defrost the first air cooler 11 in the low-temperature cold store A and/or the second air cooler 21 in the ultra-low-temperature cold store B.
In specific practice, the technical scheme provided by the embodiment is loaded in the controllers of the ultralow-temperature refrigeration house B and the low-temperature refrigeration house A or in the electronic equipment connected with the controllers.
It can be appreciated that, according to the technical scheme provided by the embodiment, the second air cooler 21 of the ultralow temperature refrigeration house B is communicated with the first air cooler 11 of the low temperature refrigeration house A and the first condenser, and the electric heater 13 between the first condenser 12 and the first air cooler 11 is used for defrosting the low temperature refrigeration house A and simultaneously can be used for defrosting the ultralow temperature refrigeration house B, so that the problem of difficulty in defrosting the ultralow temperature refrigeration house B in the prior art is solved, and the user experience is improved.
Preferably, a first pipeline is communicated between the refrigerant outlet of the first condenser 12 and the refrigerant inlet of the second air cooler 21; the refrigerant inlet of the first air cooler 11 is communicated with the first pipeline through a second pipeline;
a third pipeline is communicated between the refrigerant outlet of the second air cooler 21 and the refrigerant inlet of the electric heater 13; the refrigerant outlet of the first air cooler 11 is communicated with the third pipeline through a fourth pipeline; the refrigerant inlet of the first air cooler 11 is communicated with the third pipeline through a fifth pipeline.
Preferably, a first valve 1 is arranged between the connection point of the second pipeline and the first pipeline and the refrigerant inlet of the second air cooler 21 on the first pipeline;
The second pipeline is provided with a second valve 2, and an interface of the fifth pipeline and the second pipeline is arranged between the second valve 2 and a refrigerant inlet of the first air cooler 11;
A third valve 3 is arranged on the fifth pipeline;
a fourth valve 4 is arranged between the connection point of the fourth pipeline and the third pipeline and the connection point of the fifth pipeline and the third pipeline;
The first valve 1, the second valve 2, the third valve 3 and the fourth valve 4 are all connected with the controller.
In specific practice, if only the low-temperature refrigeration house A needs defrosting, the pipeline connection between the low-temperature refrigeration house A and the ultralow-temperature refrigeration house B is disconnected: the first valve 1, the third valve 3 and the fourth valve 4 are controlled to be closed, and the second valve 2 is controlled to be opened.
The high-temperature refrigerant flowing out of the first condenser 12 is controlled to flow into the first air cooler 11 for defrosting, and the low-temperature refrigerant flowing out of the first air cooler 11 flows back into the first condenser 12 through the electric heater 13.
In specific practice, if only the ultralow temperature refrigerator B needs defrosting, the second condenser 22 is turned off, the first condenser 12 is turned on, and the second air cooler 21 is communicated with the first condenser 12 and the first air cooler 11:
The first valve 1 and the third valve 3 are controlled to be opened, and the second valve 2 and the fourth valve 4 are controlled to be closed.
The high-temperature refrigerant flowing out of the first condenser 12 is controlled to flow into the second air cooler 21 for defrosting, and the low-temperature refrigerant flowing out of the second air cooler 21 flows into the first air cooler 11 for absorbing heat and refrigerating, and then flows back into the first condenser 12.
In specific practice, if both the low-temperature refrigerator a and the ultra-low-temperature refrigerator B need defrosting, the second condenser 22 is turned off, the first condenser 12 is turned on, and the second air cooler 21 is communicated with the first condenser 12 and the first air cooler 11:
the first valve 1, the second valve 2 and the fourth valve 4 are opened, and the third valve 3 is closed.
The high-temperature refrigerant flowing out of the first condenser 12 is controlled to flow into the first air cooler 11 and the second air cooler 21 for defrosting, and the low-temperature refrigerant flowing out of the first air cooler 11 and the second air cooler 21 is controlled to flow into the electric heater 13, and then flows back into the first condenser 12.
Preferably, a first temperature sensor connected with the controller is arranged in the low-temperature refrigerator A;
and a second temperature sensor connected with the controller is arranged in the ultralow temperature refrigeration house B.
When the low-temperature refrigerator A and the ultralow-temperature refrigerator B need defrosting, the opening degree of the second valve 2 is accurately controlled according to the storage temperature of the low-temperature refrigerator A detected by the first temperature sensor and the storage temperature of the ultralow-temperature refrigerator B detected by the second temperature sensor, so that the problem of large fluctuation of the storage temperature when the refrigerator is defrosted by electric heating in the prior art can be solved.
Preferably, a low pressure sensor is provided at the compressor suction port of the first condenser 12, and the low pressure sensor is connected to the controller;
A high pressure sensor is provided at the compressor discharge of the first condenser 12, which is connected to the controller.
The low-pressure value detected by the low-pressure sensor and the high-pressure value detected by the high-pressure sensor are used for adjusting the electric heating power of the motor heater, so that the problem that the group is easy to be protected at low pressure to cause shutdown during defrosting can be solved.
In summary, the technical scheme provided by the embodiment is that the second air cooler 21 of the ultralow temperature refrigeration house B is communicated with the first air cooler 11 of the low temperature refrigeration house a and the first condenser, the electric heater 13 between the first condenser 12 and the first air cooler 11 is used for defrosting the low temperature refrigeration house a, and meanwhile, the electric heater 13 is used for defrosting the ultralow temperature refrigeration house B, so that the problem of difficulty in defrosting the ultralow temperature refrigeration house B in the prior art is solved, and the user experience is improved.
Example two
Fig. 2 is a flowchart illustrating a defrosting method of the ultra-low temperature refrigerator B and the low temperature refrigerator a according to an exemplary embodiment, and as shown in fig. 2, the defrosting method includes:
And S11, according to the defrosting requirements of the low-temperature refrigeration house A and/or the ultralow-temperature refrigeration house B, adopting different control strategies to adjust the electric heating power of the electric heater 13, and defrosting the first air cooler 11 in the low-temperature refrigeration house A and/or the second air cooler 21 in the ultralow-temperature refrigeration house B.
It can be appreciated that, according to the technical scheme provided in this embodiment, on the basis of the hardware of the first embodiment, the second air cooler 21 of the ultralow temperature refrigeration house B is communicated with the first air cooler 11 of the low temperature refrigeration house a and the first condenser, and the electric heater 13 between the first condenser 12 and the first air cooler 11 is used for defrosting the low temperature refrigeration house a and simultaneously can be used for defrosting the ultralow temperature refrigeration house B through the electric heater 13, so that the problem of difficulty in defrosting the ultralow temperature refrigeration house B in the prior art is solved, and the user experience is improved.
Specifically, according to the defrosting requirements of the low-temperature refrigerator a and/or the ultra-low-temperature refrigerator B, different control strategies are adopted to adjust the electric heating power of the electric heater 13, including:
if only the low-temperature refrigeration house A needs defrosting, disconnecting the pipeline connection of the low-temperature refrigeration house A and the ultralow-temperature refrigeration house B;
The high-temperature refrigerant flowing out of the first condenser 12 is controlled to flow into the first air cooler 11 for defrosting, and the low-temperature refrigerant flowing out of the first air cooler 11 flows back into the first condenser 12 through the electric heater 13;
detecting a low pressure value P1 at a compressor suction port and a high pressure value P2 at a compressor discharge port in the first condenser 12;
If the low pressure value is larger than the low pressure protection value (P1 > Plow), the electric heater 13 is controlled to be kept in a closed state; otherwise, the electric heater 13 is started, and the power of the electric heater 13 is regulated according to the low pressure value P1 and the high pressure value P2 until the first air cooler 11 reaches the defrosting exit temperature, and the electric heater 13 is closed.
Preferably, the disconnection of the pipeline connection between the low-temperature refrigeration house A and the ultralow-temperature refrigeration house B is specifically as follows:
the first valve 1, the third valve 3 and the fourth valve 4 are controlled to be closed, and the second valve 2 is controlled to be opened.
Preferably, the turning on the electric heater 13 and adjusting the power of the electric heater 13 according to the low pressure value P1 and the high pressure value P2 includes:
Turning on the electric heater 13 at a first power, which is the highest power of the electric heater 13 multiplied by a first preset ratio (the first preset ratio is set according to historical experience values or experimental data, for example, is set to 20%);
Re-detecting the low pressure value P1 once every preset time period (the preset time period is set according to historical experience values or experimental data, for example, is set to 5 s);
If the low pressure value P1 is smaller than a first threshold (the first threshold is set according to historical experience values or experimental data, for example, is set to be 1.3 pdown), the power of the electric heater 13 is gradually increased from the first power to the highest power according to a first dynamic amplitude until the low pressure value P1 is equal to the first threshold, and the first threshold is a preset multiple of the low pressure protection value (the preset multiple is set according to the historical experience values or experimental data, for example, is set to be 1.3).
Assuming a first power of 20% w, then gradually increasing the power of the electric heater 13 from the first power to a maximum power at a first dynamic amplitude, the first dynamic amplitude being calculated according to the following formula:
Wherein W1 is the electric heating power at the current time, W is the highest power of the electric heater 13, and t is the time period (unit is s) from when the low pressure value is detected to be smaller than the first threshold value to when the current time is reached.
In specific practice, if the high pressure value P2 is equal to the second threshold value (the second threshold value is set according to historical experience values or experimental data, for example, is set to 0.8 pegh) in the process of gradually increasing the power of the electric heater 13 from the first power to the highest power according to the first dynamic amplitude, the magnitude of the low pressure value is not judged any more, the power of the electric heater 13 is stopped to be increased, and the current power of the electric heater 13 is maintained unchanged; the second threshold is a high voltage protection value multiplied by a first preset scaling factor (the first preset scaling factor is set according to historical empirical values or experimental data, for example, set to 0.8).
Specifically, according to the defrosting requirements of the low-temperature refrigerator a and/or the ultra-low-temperature refrigerator B, different control strategies are adopted to adjust the electric heating power of the electric heater 13, including:
If only the ultralow temperature refrigeration house B needs defrosting, the second condenser 22 is closed, the first condenser 12 is started, and the second air cooler 21 is communicated with the first condenser 12 and the first air cooler 11;
The high-temperature refrigerant flowing out of the first condenser 12 is controlled to flow into the second air cooler 21 for defrosting, and the low-temperature refrigerant flowing out of the second air cooler 21 flows into the first air cooler 11 for absorbing heat and refrigerating and then flows back into the first condenser 12;
detecting a low pressure value P1 at a compressor suction port and a high pressure value P2 at a compressor discharge port in the first condenser 12;
If the low pressure value P1 is larger than the low pressure protection value (P1 > Plow), the electric heater 13 is controlled to be kept in a closed state; otherwise, the electric heater 13 is turned on, and the power of the electric heater 13 is adjusted according to the low pressure value P1 and the high pressure value P2 until the second air cooler 21 reaches the defrosting exit temperature, and the electric heater 13 is turned off.
Preferably, the second air cooler 21 is communicated with the first condenser 12 and the first air cooler 11, specifically;
The first valve 1 and the third valve 3 are controlled to be opened, and the second valve 2 and the fourth valve 4 are controlled to be closed.
Preferably, the turning on the electric heater 13 and adjusting the power of the electric heater 13 according to the low pressure value P1 and the high pressure value P2 includes:
Turning on the electric heater 13 at a second power, which is the highest power of the electric heater 13 multiplied by a second preset ratio (the second preset ratio is set according to historical empirical values or experimental data, for example, set to 40%);
re-detecting the low pressure value once every preset time period (the preset time period is set according to historical experience values or experimental data, for example, is set to 5 s);
If the low pressure value P1 is smaller than a first threshold (the first threshold is set according to historical experience values or experimental data, for example, 1.3 pew), the power of the electric heater 13 is gradually increased from the second power to the highest power according to a second dynamic amplitude until the low pressure value P1 is equal to the first threshold, and the first threshold is a preset multiple of the low pressure protection value (the preset multiple is set according to historical experience values or experimental data, for example, 1.3).
Assuming a second power of 40% w, then gradually increasing the power of the electric heater 13 from the second power to a maximum power at a second dynamic amplitude calculated according to the following equation:
Wherein W1 is the electric heating power at the current time, W is the highest power of the electric heater 13, and t is the time period (unit is s) from when the low pressure value is detected to be smaller than the first threshold value to when the current time is reached.
In specific practice, if the high pressure value P2 is equal to the second threshold value (the second threshold value is set according to historical experience values or experimental data, for example, is set to 0.8 pegh) in the process of gradually increasing the power of the electric heater 13 from the second power to the highest power according to the second dynamic amplitude, the magnitude of the low pressure value is not judged any more, the power of the electric heater 13 is stopped to be increased, and the current power of the electric heater 13 is maintained unchanged; the second threshold is a high voltage protection value multiplied by a first preset scaling factor (the first preset scaling factor is set according to historical empirical values or experimental data, for example, set to 0.8).
Specifically, according to the defrosting requirements of the low-temperature refrigerator a and/or the ultra-low-temperature refrigerator B, different control strategies are adopted to adjust the electric heating power of the electric heater 13, including:
if the low-temperature refrigeration house A and the ultralow-temperature refrigeration house B both need defrosting, closing the second condenser 22, starting the first condenser 12, and communicating the second air cooler 21 with the first condenser 12 and the first air cooler 11;
The high-temperature refrigerant flowing out of the first condenser 12 is controlled to flow into the first air cooler 11 and the second air cooler 21 respectively for defrosting, and the low-temperature refrigerant flowing out of the first air cooler 11 and the second air cooler 21 is controlled to flow into the electric heater 13 respectively and then flow back into the first condenser 12;
detecting a low pressure value P1 at a compressor suction port and a high pressure value P2 at a compressor discharge port in the first condenser 12;
If the low pressure value P1 is larger than the low pressure protection value (P1 > Plow), the electric heater 13 is controlled to be kept in a closed state; otherwise, the electric heater 13 is turned on, and the power of the electric heater 13 is adjusted according to the low pressure value P1 and the high pressure value P2 until the first air cooler 11 and the second air cooler 21 reach the defrosting exit temperature, and then the electric heater 13 is turned off.
Preferably, the second air cooler 21 is connected to the first condenser 12 and the first air cooler 11, specifically:
the first valve 1, the second valve 2 and the fourth valve 4 are opened, and the third valve 3 is closed.
Preferably, the opening of the first valve 1 and the second valve 2 is specifically:
respectively detecting the storage temperature of the low-temperature refrigeration storage A and the storage temperature of the ultra-low-temperature refrigeration storage B;
the opening of the first valve 1 is regulated to the maximum, and the opening of the second valve 2 is calculated according to the opening of the valve 1 of the reservoir temperature of the low-temperature refrigerator A and the reservoir Wen Jidi of the ultra-low-temperature refrigerator B;
and controlling the opening degree of the second valve 2 according to the calculated opening degree of the second valve 2.
Wherein the opening of the second valve 2 is calculated according to the following formula:
Wherein, aperture 1 is the aperture of first valve 1, aperture 2 is the aperture of second valve 2, T1 is the storehouse temperature of low temperature level freezer, T2 is the storehouse temperature of high temperature level freezer.
Preferably, the turning on the electric heater 13 and adjusting the power of the electric heater 13 according to the low pressure value P1 and the high pressure value P2 includes:
turning on the electric heater 13 at a third power, which is the highest power of the electric heater 13 multiplied by a third preset ratio (the third preset ratio is set according to historical experience values or experimental data, for example, is set to 60%);
re-detecting the low pressure value once every preset time period (the preset time period is set according to historical experience values or experimental data, for example, is set to 5 s);
If the low pressure value P1 is smaller than a first threshold (the first threshold is set according to historical experience values or experimental data, for example, is set to 1.3 pdown), the power of the electric heater 13 is gradually increased from the third power to the highest power according to a third dynamic amplitude until the low pressure value P1 is equal to the first threshold, and the first threshold is a preset multiple of the low pressure protection value (the preset multiple is set according to the historical experience values or experimental data, for example, is set to 1.3).
Assuming a third power of 60% w, then gradually increasing the power of the electric heater 13 from the third power to a highest power at a third dynamic amplitude calculated according to the following formula:
Wherein W1 is the electric heating power at the current time, W is the highest power of the electric heater 13, and t is the time period (unit is s) from when the low pressure value is detected to be smaller than the first threshold value to when the current time is reached.
In specific practice, if the high pressure value P2 is equal to the third threshold value (the third threshold value is set according to historical experience values or experimental data, for example, is set to 0.9 pegh) in the process of gradually increasing the power of the electric heater 13 from the third power to the highest power according to the third dynamic amplitude, the magnitude of the low pressure value is not judged any more, the power of the electric heater 13 is stopped to be increased, and the current power of the electric heater 13 is maintained unchanged; the third threshold is a high voltage protection value multiplied by a second preset scaling factor (the second preset scaling factor is set according to historical empirical values or experimental data, for example, set to 0.9).
Preferably, after the defrosting preset time period, before the first air cooler 11 and the second air cooler 21 reach the defrosting exit temperature, the method further comprises:
if the first air cooler 11 and the second air cooler 21 do not reach the defrosting exit temperature, the control system keeps the current working state;
If only the first air cooler 11 reaches the defrosting exit temperature, the operation is carried out according to the working mode when defrosting is needed by the ultralow temperature refrigeration house, the opening of the first valve 1 is maintained to be maximum, the third valve 3 is opened, and the second valve 2 and the fourth valve 4 are closed; when the high-pressure value is larger than or equal to the high-pressure protection value, controlling the power of the electric heater 13 to be adjusted according to the working mode when the ultra-low temperature refrigerator needs defrosting;
if only the second air cooler 21 reaches the defrosting exit temperature, the first valve 1, the third valve 3 and the fourth valve 4 are closed and the second valve 2 is opened according to the working mode when defrosting is needed for the low-temperature refrigeration house; when the high-pressure value is larger than or equal to the high-pressure protection value, the electric heater 13 is controlled to operate according to the working mode when defrosting is needed only for the low-temperature refrigeration house;
if the first air cooler 11 and the second air cooler 21 reach defrosting exit temperature, the first valve 1, the third valve 3 and the fourth valve 4 are closed, the second valve 2 is opened, and the double refrigeration mode is entered.
In summary, the technical scheme provided by the embodiment is that the second air cooler 21 of the ultralow temperature refrigeration house B is communicated with the first air cooler 11 of the low temperature refrigeration house a and the first condenser, the electric heater 13 between the first condenser 12 and the first air cooler 11 is used for defrosting the low temperature refrigeration house a, and meanwhile, the electric heater 13 is used for defrosting the ultralow temperature refrigeration house B, so that the problem of difficulty in defrosting the ultralow temperature refrigeration house B in the prior art is solved, and the user experience is improved.
Further, when both the low-temperature refrigeration house A and the ultralow-temperature refrigeration house B need defrosting, according to the refrigeration house temperature of the low-temperature refrigeration house A detected by the first temperature sensor and the refrigeration house temperature of the ultralow-temperature refrigeration house B detected by the second temperature sensor, the opening degree of the second valve 2 is accurately controlled, and the problem that the refrigeration house temperature fluctuation is large when the refrigeration house is defrosted by electric heating in the prior art can be solved.
Further, the low-pressure value detected by the low-pressure sensor and the high-pressure value detected by the high-pressure sensor are used for adjusting the electric heating power of the motor heater, so that the problem that the group is easy to protect at low pressure and stop when defrosting can be solved.
The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
The integrated units in the above embodiments may be stored in the above-described computer-readable storage medium if implemented in the form of software functional units and sold or used as separate products. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing one or more computer devices (which may be personal computers, servers or network devices, etc.) to perform all or part of the steps of the method described in the embodiments of the present application.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In several embodiments provided by the present application, it should be understood that the disclosed client may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, such as the division of the units, is merely a logical function division, and may be implemented in another manner, for example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which are intended to be comprehended within the scope of the present application.
Claims (17)
1. An ultralow temperature freezer and defrosting system of low temperature freezer, characterized by comprising:
The first condenser and the second condenser are arranged in the low-temperature refrigeration house, the second air cooler is arranged in the ultralow-temperature refrigeration house, the first condenser and the electric heater are arranged outside the low-temperature refrigeration house, and the electric heater is communicated between the first condenser and the first air cooler and is communicated with the second air cooler;
The controller is used for adjusting the electric heating power of the electric heater according to the defrosting requirements of the low-temperature refrigeration house and/or the ultra-low-temperature refrigeration house by adopting different control strategies to defrost the first air cooler in the low-temperature refrigeration house and/or the second air cooler in the ultra-low-temperature refrigeration house;
A first pipeline is communicated between a refrigerant outlet of the first condenser and a refrigerant inlet of the second air cooler; the refrigerant inlet of the first air cooler is communicated with the first pipeline through a second pipeline;
A third pipeline is communicated between the refrigerant outlet of the second air cooler and the refrigerant inlet of the electric heater; the refrigerant outlet of the first air cooler is communicated with the third pipeline through a fourth pipeline; the refrigerant inlet of the first air cooler is communicated with the third pipeline through a fifth pipeline;
a low-pressure sensor is arranged at the air suction port of the compressor of the first condenser, and the low-pressure sensor is connected with the controller;
A high-pressure sensor is arranged at the exhaust port of the compressor of the first condenser, and the high-pressure sensor is connected with the controller;
the controller adopts different control strategies to adjust the electric heating power of the electric heater according to defrosting demands of the low-temperature refrigeration house and/or the ultra-low-temperature refrigeration house, and comprises the following steps:
if only the low-temperature refrigeration house needs defrosting, disconnecting the pipeline connection of the low-temperature refrigeration house and the ultralow-temperature refrigeration house;
controlling the high-temperature refrigerant flowing out of the first condenser to flow into the first air cooler for defrosting, and controlling the low-temperature refrigerant flowing out of the first air cooler to flow back into the first condenser through the electric heater;
detecting a low pressure value at an air suction port of the compressor and a high pressure value at an air discharge port of the compressor in the first condenser;
If the low pressure value is larger than the low pressure protection value, controlling the electric heater to keep a closed state; otherwise, the electric heater is started, the power of the electric heater is regulated according to the low-pressure value and the high-pressure value until the first air cooler reaches the defrosting exit temperature, and the electric heater is closed.
2. The defrosting system of claim 1, wherein the control unit,
A first valve is arranged between the connecting point of the second pipeline and the first pipeline and the refrigerant inlet of the second air cooler;
The second pipeline is provided with a second valve, and the interface of the fifth pipeline and the second pipeline is arranged between the second valve and the refrigerant inlet of the first air cooler;
A third valve is arranged on the fifth pipeline;
A fourth valve is arranged between the connection point of the fourth pipeline and the third pipeline and the connection point of the fifth pipeline and the third pipeline;
The first valve, the second valve, the third valve and the fourth valve are all connected with the controller.
3. The defrosting system of claim 1, wherein the control unit,
The low-temperature refrigerator is internally provided with a first temperature sensor connected with the controller;
And a second temperature sensor connected with the controller is arranged in the ultralow temperature refrigeration house.
4. The defrosting method for the ultralow temperature refrigeration house and the low temperature refrigeration house is characterized in that a first air cooler and a second condenser are arranged in the low temperature refrigeration house, a second air cooler is arranged in the ultralow temperature refrigeration house, a first condenser and an electric heater are arranged outside the low temperature refrigeration house, and the electric heater is communicated between the first condenser and the first air cooler and is communicated with the second air cooler; the controller is used for adjusting the electric heating power of the electric heater according to the defrosting requirements of the low-temperature refrigeration house and/or the ultra-low-temperature refrigeration house by adopting different control strategies to defrost the first air cooler in the low-temperature refrigeration house and/or the second air cooler in the ultra-low-temperature refrigeration house; a first pipeline is communicated between a refrigerant outlet of the first condenser and a refrigerant inlet of the second air cooler; the refrigerant inlet of the first air cooler is communicated with the first pipeline through a second pipeline; a third pipeline is communicated between the refrigerant outlet of the second air cooler and the refrigerant inlet of the electric heater; the refrigerant outlet of the first air cooler is communicated with the third pipeline through a fourth pipeline; the refrigerant inlet of the first air cooler is communicated with the third pipeline through a fifth pipeline; a low-pressure sensor is arranged at the air suction port of the compressor of the first condenser, and the low-pressure sensor is connected with the controller; a high-pressure sensor is arranged at the exhaust port of the compressor of the first condenser, and the high-pressure sensor is connected with the controller; the defrosting method of the ultralow-temperature refrigeration house and the low-temperature refrigeration house comprises the following steps:
according to the defrosting requirement of the low-temperature refrigeration house and/or the ultra-low-temperature refrigeration house, different control strategies are adopted to adjust the electric heating power of the electric heater, and defrosting is performed for the first air cooler in the low-temperature refrigeration house and/or the second air cooler in the ultra-low-temperature refrigeration house, and the method comprises the following steps:
if only the low-temperature refrigeration house needs defrosting, disconnecting the pipeline connection of the low-temperature refrigeration house and the ultralow-temperature refrigeration house;
controlling the high-temperature refrigerant flowing out of the first condenser to flow into the first air cooler for defrosting, and controlling the low-temperature refrigerant flowing out of the first air cooler to flow back into the first condenser through the electric heater;
detecting a low pressure value at an air suction port of the compressor and a high pressure value at an air discharge port of the compressor in the first condenser;
If the low pressure value is larger than the low pressure protection value, controlling the electric heater to keep a closed state; otherwise, the electric heater is started, the power of the electric heater is regulated according to the low-pressure value and the high-pressure value until the first air cooler reaches the defrosting exit temperature, and the electric heater is closed.
5. The defrosting method according to claim 4, wherein a first valve is provided on the first pipe between a connection point of the second pipe and the first pipe and a refrigerant inlet of the second air cooler; the second pipeline is provided with a second valve, and the interface of the fifth pipeline and the second pipeline is arranged between the second valve and the refrigerant inlet of the first air cooler; a third valve is arranged on the fifth pipeline; a fourth valve is arranged between the connection point of the fourth pipeline and the third pipeline and the connection point of the fifth pipeline and the third pipeline; the first valve, the second valve, the third valve and the fourth valve are all connected with the controller; the pipeline connection for disconnecting the low-temperature refrigeration house and the ultralow-temperature refrigeration house is specifically as follows:
and controlling the first valve, the third valve and the fourth valve to be closed, and opening the second valve.
6. The defrosting method of claim 4 wherein the turning on the electric heater and adjusting the power of the electric heater according to the low pressure value and the high pressure value comprises:
starting the electric heater with first power, wherein the first power is the highest power of the electric heater multiplied by a first preset proportion;
Re-detecting the low pressure value once every preset time;
And if the low pressure value is smaller than a first threshold value, gradually increasing the power of the electric heater from the first power to the highest power according to a first dynamic amplitude until the low pressure value is equal to the first threshold value, wherein the first threshold value is a preset multiple of a low pressure protection value.
7. The defrosting method of claim 6, further comprising:
If the power of the electric heater is gradually increased from the first power to the highest power according to the first dynamic amplitude, the high-pressure value is equal to the second threshold value, the low-pressure value is not judged any more, the power of the electric heater is stopped being increased, and the current power of the electric heater is maintained unchanged; the second threshold is a high voltage protection value multiplied by a first preset scaling factor.
8. The defrosting method according to claim 4, wherein the adjusting the electric heating power of the electric heater according to the defrosting demands of the low-temperature refrigerator and/or the ultra-low-temperature refrigerator by adopting different control strategies comprises:
If only the ultralow-temperature refrigeration house needs defrosting, closing the second condenser, starting the first condenser, and communicating the second air cooler with the first condenser and the first air cooler;
controlling the high-temperature refrigerant flowing out of the first condenser to flow into the second air cooler for defrosting, and controlling the low-temperature refrigerant flowing out of the second air cooler to flow into the first air cooler for absorbing heat and refrigerating and then flow back into the first condenser;
detecting a low pressure value at an air suction port of the compressor and a high pressure value at an air discharge port of the compressor in the first condenser;
If the low pressure value is larger than the low pressure protection value, controlling the electric heater to keep a closed state; otherwise, the electric heater is started, the power of the electric heater is regulated according to the low-pressure value and the high-pressure value until the second air cooler reaches the defrosting exit temperature, and the electric heater is closed.
9. The defrosting method according to claim 8, characterized in that the second air cooler is in communication with the first condenser and the first air cooler, in particular;
And controlling the first valve and the third valve to be opened, and controlling the second valve and the fourth valve to be closed.
10. The defrosting method of claim 8 wherein the turning on the electric heater and adjusting the power of the electric heater according to the low pressure value and the high pressure value comprises:
Starting the electric heater with a second power, wherein the second power is the highest power of the electric heater multiplied by a second preset proportion;
Re-detecting the low pressure value once every preset time;
And if the low-pressure value is smaller than a first threshold value, gradually increasing the power of the electric heater from the second power to the highest power according to a second dynamic amplitude value until the low-pressure value is equal to the first threshold value, wherein the first threshold value is a preset multiple of a low-pressure protection value.
11. A defrosting method according to claim 10, wherein,
If the power of the electric heater is gradually increased from the second power to the highest power according to the second dynamic amplitude, the high-pressure value is equal to a second threshold value, the low-pressure value is not judged any more, the power of the electric heater is stopped being increased, and the current power of the electric heater is maintained unchanged; the second threshold is a high voltage protection value multiplied by a first preset scaling factor.
12. The defrosting method according to claim 4, wherein the adjusting the electric heating power of the electric heater according to the defrosting demands of the low-temperature refrigerator and/or the ultra-low-temperature refrigerator by adopting different control strategies comprises:
If the low-temperature refrigeration house and the ultra-low-temperature refrigeration house both need defrosting, closing the second condenser, starting the first condenser, and communicating the second air cooler with the first condenser and the first air cooler;
The high-temperature refrigerant flowing out of the first condenser is controlled to flow into the first air cooler and the second air cooler respectively for defrosting, and the low-temperature refrigerant flowing out of the first air cooler and the second air cooler is controlled to flow into the electric heater respectively and then flow back into the first condenser;
detecting a low pressure value at an air suction port of the compressor and a high pressure value at an air discharge port of the compressor in the first condenser;
If the low pressure value is larger than the low pressure protection value, controlling the electric heater to keep a closed state; otherwise, the electric heater is started, the power of the electric heater is regulated according to the low-pressure value and the high-pressure value until the first air cooler and the second air cooler reach defrosting exit temperature, and the electric heater is closed.
13. The defrosting method according to claim 12, wherein the communicating of the second air cooler with the first condenser and the first air cooler is specifically:
and opening the first valve, the second valve and the fourth valve, and closing the third valve.
14. The defrosting method according to claim 13, wherein the opening of the first valve and the second valve is specifically:
respectively detecting the storage temperature of the low-temperature refrigeration storage and the storage temperature of the ultralow-temperature refrigeration storage;
The opening of the first valve is regulated to be the maximum, and the opening of the second valve is calculated according to the opening of a valve of the refrigerator temperature of the low-temperature refrigerator and the refrigerator Wen Jidi of the ultralow-temperature refrigerator;
And controlling the opening degree of the second valve according to the calculated opening degree of the second valve.
15. The defrosting method of claim 12 wherein the turning on the electric heater and adjusting the power of the electric heater according to the low pressure value and the high pressure value comprises:
starting the electric heater with third power, wherein the third power is the highest power of the electric heater multiplied by a third preset proportion;
Re-detecting the low pressure value once every preset time;
And if the low-pressure value is smaller than a first threshold value, gradually increasing the power of the electric heater from the third power to the highest power according to a third dynamic amplitude until the low-pressure value is equal to the first threshold value, wherein the first threshold value is a preset multiple of a low-pressure protection value.
16. A defrosting method according to claim 15, wherein,
If the power of the electric heater is gradually increased from the third power to the highest power according to the third dynamic amplitude, the high-pressure value is equal to a third threshold value, the low-pressure value is not judged any more, the power of the electric heater is stopped being increased, and the current power of the electric heater is maintained unchanged; the third threshold is a high-voltage protection value multiplied by a second preset proportionality coefficient.
17. The defrosting method of claim 12 wherein after the defrosting preset time period, before the first air cooler and the second air cooler reach defrosting exit temperature, further comprising:
If the first air cooler and the second air cooler do not reach the defrosting exit temperature, the control system keeps the current working state;
If only the first air cooler reaches the defrosting exit temperature, the operation is carried out according to the working mode when only the ultralow temperature refrigeration house needs defrosting, the opening of the first valve is maintained to be maximum, the third valve is opened, and the second valve and the fourth valve are closed; when the high-pressure value is larger than or equal to the high-pressure protection value, controlling the power of the electric heater to be adjusted according to the working mode when the ultra-low temperature refrigerator needs defrosting;
If only the second air cooler reaches the defrosting exit temperature, the first valve, the third valve and the fourth valve are closed according to the working mode when only the low-temperature refrigeration house needs defrosting, and the second valve is opened; when the high-pressure value is larger than or equal to the high-pressure protection value, controlling the electric heater to operate according to the working mode when defrosting is needed only for the low-temperature refrigeration house;
If the first air cooler and the second air cooler reach defrosting exit temperature, the first valve, the third valve and the fourth valve are closed, the second valve is opened, and the double-refrigeration mode is entered.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735264A (en) * | 2020-07-31 | 2020-10-02 | 四方科技集团股份有限公司 | Air cooler defrosting device for ultra-low temperature warehouse |
| CN112197403A (en) * | 2020-08-28 | 2021-01-08 | 珠海格力电器股份有限公司 | Air cooler defrosting control method and device, storage medium and air cooler |
| CN215412600U (en) * | 2021-04-30 | 2022-01-04 | 广州大卡制冷设备有限公司 | Ultralow temperature refrigerating system and ultralow temperature refrigeration house |
| CN115342590A (en) * | 2022-08-01 | 2022-11-15 | 华东医药供应链管理(杭州)有限公司 | Intelligent control device and control method for defrosting waste heat of air cooler of vaccine ultra-low temperature warehouse |
| CN115711511A (en) * | 2022-11-11 | 2023-02-24 | 珠海格力电器股份有限公司 | Thermal fluorination defrosting control method and device and refrigeration equipment |
| CN220135815U (en) * | 2023-06-16 | 2023-12-05 | 山东神舟制冷设备有限公司 | Defrosting system for high-low temperature refrigeration house |
-
2023
- 2023-12-13 CN CN202311708793.8A patent/CN117387279B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735264A (en) * | 2020-07-31 | 2020-10-02 | 四方科技集团股份有限公司 | Air cooler defrosting device for ultra-low temperature warehouse |
| CN112197403A (en) * | 2020-08-28 | 2021-01-08 | 珠海格力电器股份有限公司 | Air cooler defrosting control method and device, storage medium and air cooler |
| CN215412600U (en) * | 2021-04-30 | 2022-01-04 | 广州大卡制冷设备有限公司 | Ultralow temperature refrigerating system and ultralow temperature refrigeration house |
| CN115342590A (en) * | 2022-08-01 | 2022-11-15 | 华东医药供应链管理(杭州)有限公司 | Intelligent control device and control method for defrosting waste heat of air cooler of vaccine ultra-low temperature warehouse |
| CN115711511A (en) * | 2022-11-11 | 2023-02-24 | 珠海格力电器股份有限公司 | Thermal fluorination defrosting control method and device and refrigeration equipment |
| CN220135815U (en) * | 2023-06-16 | 2023-12-05 | 山东神舟制冷设备有限公司 | Defrosting system for high-low temperature refrigeration house |
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