CN113915894B - Refrigerator and refrigerating method thereof - Google Patents

Refrigerator and refrigerating method thereof Download PDF

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Publication number
CN113915894B
CN113915894B CN202110534763.4A CN202110534763A CN113915894B CN 113915894 B CN113915894 B CN 113915894B CN 202110534763 A CN202110534763 A CN 202110534763A CN 113915894 B CN113915894 B CN 113915894B
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evaporator
temperature
freezing
refrigerating
compressor
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CN113915894A (en
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马科帅
董安琪
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Hisense Refrigerator Co Ltd
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Hisense Refrigerator Co Ltd
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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
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2600/00—Control issues
    • F25D2600/06—Controlling according to a predetermined profile
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/10—Sensors measuring the temperature of the evaporator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/14—Sensors measuring the temperature outside the refrigerator or freezer

Abstract

The invention discloses a refrigerator, comprising: the refrigeration system comprises a compressor, a heat regenerator, a condenser, a freezing evaporator, a liquid storage device, a first electromagnetic valve, a pump and a refrigeration evaporator; the heat regenerator is used for exchanging heat between the low-temperature liquid refrigerant output by the pump and the high-temperature gaseous refrigerant output by the compressor; the controller is configured to: acquiring the temperature of a freezing evaporator of the freezing evaporator; when the temperature of the freezing evaporator is lower than a preset evaporator temperature threshold value, opening the first electromagnetic valve to enable the pump to work; acquiring the refrigerating temperature of the refrigerating chamber; and when the refrigerating temperature is lower than a preset refrigerating temperature threshold value, closing the first electromagnetic valve so as to stop the pump. The invention also discloses a refrigeration method of the refrigerator. By adopting the embodiment of the invention, the normal refrigeration of the refrigerator can be ensured, and the liquid impact of the compressor in the running process can be prevented.

Description

Refrigerator and refrigerating method thereof
Technical Field
The invention relates to the technical field of refrigerators, in particular to a refrigerator and a refrigerating method thereof.
Background
At present, a traditional refrigerator refrigerating system mainly comprises a compressor, a condenser, an evaporator and a capillary tube, wherein a refrigerant is vaporized into gas from liquid in the evaporator to absorb heat in the refrigerator, the gaseous refrigerant is compressed into high-temperature and high-pressure gas by the compressor and then discharged into the condenser, the condenser condenses the gas into liquid, then the liquid flows through the capillary tube and then flows into the evaporator, and the liquid is continuously vaporized in the evaporator to absorb heat and reduce temperature. The above steps are repeated in cycles and are circulated continuously to achieve the purpose of refrigeration. However, the existing refrigerator usually only adopts a compressor refrigeration cycle system, the electric power of the compressor is high, and large energy consumption is needed, and the adoption of the common compressor refrigeration cycle easily causes liquid impact of the compressor in the operation process, thereby affecting the service life of the compressor.
Disclosure of Invention
The embodiment of the invention aims to provide a refrigerator and a refrigerating method thereof, which can ensure normal refrigeration of the refrigerator and prevent a compressor from generating liquid impact in the operation process.
To achieve the above object, an embodiment of the present invention provides a refrigerator, including:
a cabinet including a plurality of storage compartments;
the refrigerating system comprises a compressor, a heat regenerator, a condenser, a freezing evaporator, a liquid storage device, a first electromagnetic valve, a pump and a refrigerating evaporator; the system comprises a freezing evaporator, a liquid storage device, a compressor, a heat regenerator, a pump, a first electromagnetic valve, a pump, a heat regenerator and a control unit, wherein a water inlet of the liquid storage device is connected with the freezing evaporator, a gas outlet of the liquid storage device is connected with the compressor, a water outlet of the liquid storage device is connected with the first electromagnetic valve, the first electromagnetic valve is connected with the pump, the pump is connected with the heat regenerator, and the heat regenerator is used for exchanging heat between low-temperature liquid refrigerant output by the pump and high-temperature gaseous refrigerant output by the compressor;
the controller is configured to:
the controller is configured to:
acquiring the temperature of a freezing evaporator of the freezing evaporator;
when the temperature of the freezing evaporator is lower than a preset evaporator temperature threshold value, opening the first electromagnetic valve to enable the pump to work;
acquiring the refrigerating temperature of the refrigerating chamber;
and when the refrigerating temperature is lower than a preset refrigerating temperature threshold value, closing the first electromagnetic valve so as to stop the pump.
As an improvement of the above scheme, the refrigeration system further includes a second electromagnetic valve, the second electromagnetic valve is connected to an input port of the freezing evaporator and an output port of the refrigerating evaporator, and is used for flowing the high-temperature refrigerant flowing out of the refrigerating evaporator into the freezing evaporator;
then, the controller is further configured to:
acquiring the freezing temperature of the freezing chamber;
and when the freezing temperature reaches a preset freezing temperature threshold value, opening the second electromagnetic valve.
As an improvement of the above, before the obtaining of the freezing evaporator temperature of the freezing evaporator, the controller is configured to:
acquiring the freezing temperature of a freezing chamber in the refrigerator;
when the freezing temperature is higher than the preset freezing starting temperature, the compressor is started
As an improvement of the above scheme, the refrigeration system further comprises a dry filter, and the dry filter is arranged between the condenser and the freezing evaporator; the drying filter is used for filtering the physical dust carried in the flowing process of the refrigerant and adsorbing the residual moisture of the refrigeration system.
In order to achieve the above object, an embodiment of the present invention further provides a refrigeration method for a refrigerator, which is applicable to a refrigeration system in a refrigerator, where the refrigeration system includes a compressor, a heat regenerator, a condenser, a freezing evaporator, a liquid reservoir, a first electromagnetic valve, a pump, and a refrigerating evaporator; the system comprises a freezing evaporator, a liquid storage device, a compressor, a heat regenerator, a pump, a first electromagnetic valve, a pump, a heat regenerator and a control unit, wherein a water inlet of the liquid storage device is connected with the freezing evaporator, a gas outlet of the liquid storage device is connected with the compressor, a water outlet of the liquid storage device is connected with the first electromagnetic valve, the first electromagnetic valve is connected with the pump, the pump is connected with the heat regenerator, and the heat regenerator is used for exchanging heat between low-temperature liquid refrigerant output by the pump and high-temperature gaseous refrigerant output by the compressor; the refrigeration method of the refrigerator comprises the following steps:
acquiring the temperature of a freezing evaporator of the freezing evaporator;
when the temperature of the freezing evaporator is lower than a preset evaporator temperature threshold value, opening the first electromagnetic valve to enable the pump to work;
acquiring the refrigerating temperature of the refrigerating chamber;
and when the refrigerating temperature is smaller than a preset refrigerating temperature threshold value, closing the first electromagnetic valve to stop the pump.
As an improvement of the above scheme, the refrigeration system further includes a second electromagnetic valve, the second electromagnetic valve is connected to an input port of the freezing evaporator and an output port of the refrigerating evaporator, and is used for flowing the high-temperature refrigerant flowing out of the refrigerating evaporator into the freezing evaporator;
then, the refrigerator cooling method further includes:
acquiring the freezing temperature of the freezing chamber;
and when the freezing temperature reaches a preset freezing temperature threshold value, opening the second electromagnetic valve.
As an improvement of the above, before obtaining the freezing evaporator temperature of the freezing evaporator, the method further includes:
obtaining the freezing temperature of a freezing chamber in the refrigerator;
and starting the compressor when the freezing temperature is higher than a preset freezing starting temperature.
As an improvement of the above scheme, the refrigeration system further comprises a dry filter, and the dry filter is arranged between the condenser and the freezing evaporator; the drying filter is used for filtering the physical dust carried in the flowing process of the refrigerant and adsorbing the residual moisture of the refrigeration system.
Compared with the prior art, the refrigerator and the refrigeration method thereof in the embodiment of the invention adopt different power cycle refrigeration systems in the refrigerating and freezing chamber: the refrigeration of a compressor and the refrigeration of a pump are realized, the electric power of the pump is much smaller than that of the compressor, the energy efficiency of a pump refrigeration system is high, and particularly, the refrigeration requirements of different compartments are realized by controlling cold air distribution by opening and closing an air door of a refrigerator with a refrigerating and freezing compartment. The heat regenerator is arranged behind the compressor, and the pumped low-temperature liquid refrigerant exchanges heat with the high-temperature gaseous refrigerant at the outlet of the compressor, so that the temperature of the refrigerant flowing to the refrigerating evaporator is not too low, the wet air in the refrigerating chamber is prevented from being frozen into ice on the refrigerating evaporator, and the defrosting operation of the refrigerating evaporator is reduced. In addition, the tail end of the freezing evaporator is provided with a liquid storage device, so that liquid impact generated in the running process of the compressor can be prevented.
Drawings
FIG. 1 is a schematic diagram of a refrigeration system for a refrigerator according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating an operation of a refrigerator according to an embodiment of the present invention;
fig. 3 is a flowchart of a refrigeration method of a refrigerator according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The refrigerator provided by the embodiment of the invention comprises a refrigerator body, a refrigerating system and a controller. The cabinet includes a plurality of storage compartments such as a refrigerating compartment, a freezing compartment, and a temperature-variable compartment. Referring to fig. 1, the refrigeration system includes a compressor 101, a regenerator 102, a condenser 103, a freezing evaporator 104, an accumulator 105, a first solenoid valve 107, a pump 106, and a refrigerating evaporator 108; the water inlet of the liquid storage device 105 is connected to the freezing evaporator 104, the air outlet of the liquid storage device 105 is connected to the compressor 101, the water outlet of the liquid storage device 105 is connected to the first electromagnetic valve 107, the first electromagnetic valve 107 is connected to the pump 106, the pump 106 is connected to the heat regenerator 102, and the heat regenerator 102 is configured to exchange heat between the low-temperature liquid refrigerant output by the pump 106 and the high-temperature gaseous refrigerant output by the compressor 101;
the controller is configured to:
obtaining a freeze evaporator temperature of the freeze evaporator 104;
when the freezing evaporator temperature is lower than a preset evaporator temperature threshold, opening the first electromagnetic valve 107 to enable the pump 106 to work;
acquiring the refrigerating temperature of the refrigerating chamber;
when the refrigerating temperature is lower than the preset refrigerating temperature threshold value, the first electromagnetic valve 107 is closed, so that the pump 106 stops working.
Illustratively, the accumulator 105 includes a water inlet, a gas outlet and a water outlet, and the two-phase refrigerant flowing from top to bottom realizes gas-liquid separation in the accumulator 105. Because the density of the gaseous refrigerant is smaller, the upper part of the liquid storage device 105 is the gaseous refrigerant, because the air outlet is connected with the compressor 101, the inlet section of the air return pipe of the compressor 101 is higher, an oil return hole is arranged at the lowest end of the air return pipe, which extends into the liquid storage device 105, and the density of the lubricating oil for the compressor 101 is maximally sunk at the lowest part of the liquid storage device 105, so that the compressor 101 is not subjected to liquid impact, and the lubricating oil can also return to the compressor 101 to ensure the lubrication of the compressor 101. The liquid refrigerant with relatively high density is stored in the lower part of the liquid storage 105, the inlet section of the connecting pipe of the pump 106 is low, and the liquid refrigerant can be directly circulated by the pump. A first electromagnetic valve 107 is disposed behind a connection pipe of the liquid storage device 105, and a temperature sensor disposed in the freezing evaporator 104 is used to determine whether the state of the refrigerant in the liquid storage device 105 meets the requirement of a pump refrigeration cycle, generally, after the compressor 101 performs refrigeration and enters a periodic refrigeration cycle, the refrigerant flow of the compressor 101 is small, and most of the liquid refrigerant is stored in the liquid storage device 105, so that the circulation requirement of a refrigeration pump is completely met.
The heat regenerator 102 is arranged behind the compressor 101, the low-temperature liquid refrigerant sent by the pump 106 exchanges heat with the high-temperature gaseous refrigerant at the outlet of the compressor 101, and the temperature of the refrigerant flowing to the refrigeration evaporator 108 is guaranteed not to be too low (generally, the temperature is greater than 0 ℃, because the temperature of the refrigeration chamber is set to be higher than 0 ℃, the temperature difference exists between the temperature of the refrigerant in the refrigeration evaporator 108 and the set temperature of the chamber, the temperature requirement of the refrigeration chamber can be guaranteed), so that the wet air in the refrigeration chamber is prevented from being frozen into ice on the refrigeration evaporator 108, and the defrosting operation of the refrigeration evaporator 108 is reduced.
Further, the refrigeration system further comprises a second electromagnetic valve 109, wherein the second electromagnetic valve 109 is connected with an input port of the freezing evaporator 104 and an output port of the refrigerating evaporator 108, and is used for flowing the high-temperature refrigerant flowing out of the refrigerating evaporator 108 into the freezing evaporator 104;
then, the controller is further configured to:
acquiring the freezing temperature of the freezing chamber;
when the freezing temperature reaches a preset freezing temperature threshold value, the second electromagnetic valve 109 is opened.
Illustratively, when the freezing compartment temperature reaches a set value first, the compressor refrigeration is stopped, and at this time, the refrigerating compartment temperature does not meet the requirement yet, at this time, the second electromagnetic valve 109 is opened, so that the high-temperature refrigerant flowing out of the refrigerating evaporator 108 flows into the freezing evaporator 104, after heat release, flows through the accumulator and is pressurized by the pump 106 to complete the cycle, where the opening degree of the second electromagnetic valve 109 is determined by the temperature of the refrigerant flowing into the refrigerating evaporator 108, thereby ensuring that the wall temperature of the refrigerating evaporator 108 is not too low (generally greater than 0 ℃).
Further, the opening degree of the second electromagnetic valve 109 is determined by the temperature of the refrigerant flowing into the refrigeration evaporator 108, and includes:
the opening degree of the second solenoid valve 109 decreases as the temperature of the refrigerant flowing into the refrigerating evaporator 108 increases.
Illustratively, when the temperature of the refrigerant flowing into the refrigeration evaporator 108 (which can be detected by a temperature sensor arranged at the inlet of the refrigeration evaporator) is increased, it indicates that the refrigeration evaporator 108 does not frost too much, and when the refrigerant which needs to be heated by the pump cycle is less, the opening degree of the second electromagnetic valve 109 is smaller; when the temperature of the refrigerant flowing into the refrigerating evaporator 108 is lowered, the opening degree of the second electromagnetic valve 109 is increased to avoid excessive frost formation of the refrigerating evaporator 108, which requires the refrigerant to be heated by a pump cycle.
Further, before obtaining the freeze evaporator temperature of the freeze evaporator 104, the controller is configured to:
obtaining the freezing temperature of a freezing chamber in the refrigerator;
and when the freezing temperature is higher than a preset freezing starting temperature, starting the compressor 101.
Referring to fig. 2, when the refrigerator is powered on for the first time, the refrigerating chamber and the freezing chamber are both at the ring temperature, the rotating speed of the compressor 101 is determined according to the ring temperature, the compressor is started to perform circulating refrigeration, at this time, the load of the system is extremely large, the flow of refrigerant in the system is large, the outlet of the liquid storage device 105 is in an overheated state, almost no liquid refrigerant exists in the liquid storage device 105, and at this time, the compressor 101 can be used only for refrigeration. Along with the reduction of the temperature of the freezing chamber, the load of the system is reduced, the flow rate of the refrigerant is reduced, most of liquid refrigerant can be stored in the liquid storage device 105, the temperature is judged by a temperature sensor in the cavity of the freezing evaporator, generally, when the temperature is smaller than the temperature threshold value of the evaporator (which can be-10 ℃, and the temperature can be different according to different refrigerator designs), the first electromagnetic valve 107 can be opened, the pump 106 of the refrigerating chamber is started to carry out circulating refrigeration, the low-temperature refrigerant exchanges heat with the hot air in the refrigerating chamber through the refrigerating evaporator 108, the temperature is increased, and finally the low-temperature refrigerant and the refrigerant in the circulation of the compressor are converged in the air return pipe, and the air return pipe and the capillary heat exchange structure can meet the condition that the refrigerant of the compressor is changed into a gas state, so that the liquid impact of the compressor is avoided. When the temperature of the freezing chamber reaches a set value, the compressor stops refrigerating, and the temperature of the refrigerating chamber does not meet the requirement, at the moment, the second electromagnetic valve 109 is opened, so that the high-temperature refrigerant flowing out of the refrigerating evaporator 108 flows into the freezing evaporator 104, heat is released, and then the high-temperature refrigerant is pressurized by the pump 106 to complete circulation, so that the wall temperature of the refrigerating evaporator 108 is not too low, and the refrigerating can be stopped when the temperature of the refrigerating chamber is reduced to the set value.
Optionally, the refrigeration system further comprises a dry filter 110, wherein the dry filter 110 is disposed between the condenser 103 and the freezing evaporator 104; the filter-drier 110 is used for filtering the physical dust and moisture carried in the refrigerant flowing process and adsorbing the residual moisture in the refrigeration system. The refrigeration system further comprises a throttling device 111, wherein the throttling device 111 is arranged between the drying filter 110 and the freezing evaporator 104; wherein the throttling device 111 is used for adjusting the flow rate of the refrigerant.
Further, the refrigeration system in the embodiment of the present invention is further provided with a first check valve 112 and a second check valve 113, the first check valve 112 is disposed between the heat regenerator 102 and the refrigerating evaporator 108, and the second check valve 113 is disposed between the refrigerating evaporator 108 and the compressor 101.
Compared with the prior art, the refrigerator provided by the embodiment of the invention adopts different power cycle refrigeration systems in the refrigerating and freezing chamber: the refrigeration of a compressor and the refrigeration of a pump are realized, the electric power of the pump is much smaller than that of the compressor, the energy efficiency of a pump refrigeration system is high, and particularly, the refrigeration requirements of different compartments are realized by controlling cold air distribution by opening and closing an air door of a refrigerator with a refrigerating and freezing compartment. The heat regenerator is arranged behind the compressor, the pumped low-temperature liquid refrigerant exchanges heat with the high-temperature gaseous refrigerant at the outlet of the compressor, and the temperature of the refrigerant flowing to the refrigeration evaporator is ensured to be too low, so that the wet air in the refrigeration chamber is prevented from being frozen into ice on the refrigeration evaporator, and the defrosting operation of the refrigeration evaporator is reduced. In addition, the tail end of the freezing evaporator is provided with a liquid storage device, so that liquid impact generated in the running process of the compressor can be prevented.
Referring to fig. 3, fig. 3 is a flowchart of a refrigeration method of a refrigerator according to an embodiment of the present invention, where the refrigeration method of the refrigerator according to the embodiment of the present invention may be implemented by a controller in the refrigerator, where the refrigeration system includes a compressor, a heat regenerator, a condenser, a freezing evaporator, a liquid reservoir, a first solenoid valve, a pump, and a refrigerating evaporator; the system comprises a freezing evaporator, a liquid storage device, a compressor, a heat regenerator, a pump, a first electromagnetic valve, a pump, a heat regenerator and a control unit, wherein a water inlet of the liquid storage device is connected with the freezing evaporator, a gas outlet of the liquid storage device is connected with the compressor, a water outlet of the liquid storage device is connected with the first electromagnetic valve, the first electromagnetic valve is connected with the pump, the pump is connected with the heat regenerator, and the heat regenerator is used for exchanging heat between low-temperature liquid refrigerant output by the pump and high-temperature gaseous refrigerant output by the compressor; the refrigeration method of the refrigerator comprises the following steps:
s1, obtaining the temperature of a freezing evaporator of the freezing evaporator;
s2, when the temperature of the freezing evaporator is smaller than a preset evaporator temperature threshold value, the first electromagnetic valve is opened to enable the pump to work;
s3, obtaining the refrigerating temperature of the refrigerating chamber;
and S4, when the refrigerating temperature is smaller than a preset refrigerating temperature threshold value, closing the first electromagnetic valve to stop the pump.
Illustratively, the reservoir comprises a water inlet, a gas outlet and a water outlet, and the two-phase refrigerant flowing from top to bottom realizes gas-liquid separation in the reservoir. Because the density of the gaseous refrigerant is smaller, the upper part of the liquid storage device is the gaseous refrigerant, the air outlet is connected with the compressor, the inlet section of the air return pipe of the compressor is higher, the lowest end of the air return pipe penetrating into the liquid storage device is provided with an oil return hole, and the density of the lubricating oil for the compressor is maximally sunk to the lowest part of the liquid storage device, so that the compressor is not subjected to liquid impact, and the lubricating oil can return to the compressor to ensure the lubrication of the compressor. The liquid refrigerant has relatively high density and is stored in the lower part of the liquid accumulator, the inlet section of the connecting pipe of the pump is relatively low, and the liquid refrigerant can be directly circulated by the pump. Dispose first solenoid valve behind the reservoir connecting pipe, judge through arranging the temperature sensor in freezing evaporimeter whether satisfy pump refrigeration circulation in the reservoir refrigerant state, usually after the compressor refrigeration gets into periodic refrigeration circulation, the refrigerant flow of compressor is less, and the reservoir deposit has most liquid refrigerant, satisfies cold-stored pump circulation demand completely.
The heat regenerator is arranged behind the compressor, the pumped low-temperature liquid refrigerant exchanges heat with the high-temperature gaseous refrigerant at the outlet of the compressor, and the temperature of the refrigerant flowing to the refrigeration evaporator is guaranteed not to be too low (generally greater than 0 ℃, the temperature of the refrigeration chamber is set to be higher than 0 ℃, and the temperature difference exists between the temperature of the refrigerant in the refrigeration evaporator and the set temperature of the chamber, so that the temperature requirement of the refrigeration chamber can be guaranteed), the wet air in the refrigeration chamber is prevented from being frozen into ice on the refrigeration evaporator, and the defrosting operation of the refrigeration evaporator is reduced.
The refrigeration system further comprises a second electromagnetic valve, wherein the second electromagnetic valve is connected with an input port of the freezing evaporator and an output port of the refrigerating evaporator and is used for enabling high-temperature refrigerant flowing out of the refrigerating evaporator to flow into the freezing evaporator;
then, the refrigerator cooling method further includes:
acquiring the freezing temperature of the freezing chamber;
and when the freezing temperature reaches a preset freezing temperature threshold value, opening the second electromagnetic valve.
Illustratively, when the temperature of the freezing compartment reaches a set value first, the compressor stops refrigerating, and the temperature of the refrigerating compartment does not meet the requirement yet, at this time, the second electromagnetic valve is opened, so that the high-temperature refrigerant flowing out of the refrigerating evaporator flows into the freezing evaporator, releases heat, flows through the liquid accumulator and is pressurized by the pump to complete the cycle, wherein the opening degree of the second electromagnetic valve is determined by the temperature of the refrigerant flowing into the refrigerating evaporator 108, thereby ensuring that the temperature of the wall surface of the refrigerating evaporator is not too low (generally greater than 0 ℃).
Further, the second solenoid valve opening degree is determined by a temperature of the refrigerant flowing into the refrigeration evaporator, and includes:
the opening degree of the second solenoid valve decreases as the temperature of the refrigerant flowing into the refrigerating evaporator increases.
Illustratively, when the temperature of the refrigerant flowing into the refrigerating evaporator rises, it indicates that the refrigerating evaporator does not frost too much, and at this time, the refrigerant which needs to be heated by the pump cycle is less, and the opening degree of the second electromagnetic valve is smaller; when the temperature of the refrigerant flowing into the refrigeration evaporator is reduced, in order to avoid excessive frosting of the refrigeration evaporator, the refrigerant needs to be heated through a pump cycle, and the opening degree of the second electromagnetic valve is larger.
Further, before obtaining the temperature of the freezing evaporator, the refrigeration method of the refrigerator comprises the following steps:
acquiring the freezing temperature of a freezing chamber in the refrigerator;
and when the freezing temperature is higher than a preset freezing starting temperature, starting the compressor.
For example, when the refrigerator is powered on for the first time, the refrigerating chamber and the freezing chamber are both at the ring temperature, the rotating speed of the compressor is determined according to the ring temperature, the compressor is started to carry out circulating refrigeration, the load of the system is extremely large, the flow of refrigerant in the system is large, the outlet of the liquid storage device is in an overheated state, almost no liquid refrigerant exists in the liquid storage device, and the compressor can be used for refrigerating at the moment. The system load is reduced along with the reduction of the temperature of the freezing chamber, the flow rate of the refrigerant is reduced, most of liquid refrigerant can be stored in the liquid storage device, the temperature is judged by a temperature sensor in the cavity of the freezing evaporator, when the temperature is generally smaller than the temperature threshold value of the evaporator (can be-10 ℃, and the temperature can be different in different refrigerator designs), the first electromagnetic valve can be opened, the pump circulation refrigeration of the refrigerating chamber is started, the low-temperature refrigerant is subjected to heat exchange with the hot air in the refrigerating chamber through the refrigerating evaporator, the temperature is increased, and finally the low-temperature refrigerant is converged with the refrigerant in the circulation of the compressor in the air return pipe, and the air return pipe and the capillary heat exchange structure can meet the condition that the refrigerant of the back compressor is changed into a gas state, so that the liquid impact of the compressor is avoided. When the temperature of the freezing chamber reaches a set value, the compressor stops refrigerating, and the temperature of the refrigerating chamber does not meet the requirement, the second electromagnetic valve is opened at the moment, so that high-temperature refrigerant flowing out of the refrigerating evaporator flows into the freezing evaporator, heat is released, and then the refrigerant is pressurized by the pump to complete circulation, so that the wall temperature of the refrigerating evaporator is not too low, and the refrigerating can be stopped when the temperature of the refrigerating chamber is reduced to the set value.
Optionally, the refrigeration system further comprises a dry filter, and the dry filter is arranged between the condenser and the freezing evaporator; the drying filter is used for filtering the physical dust carried in the flowing process of the refrigerant and adsorbing the residual moisture of the refrigeration system. The refrigerating system also comprises a throttling device, and the throttling device is arranged between the drying filter and the freezing evaporator; wherein the throttling device is used for adjusting the flow of the refrigerant.
Furthermore, the refrigeration system in the embodiment of the present invention is further provided with a first check valve and a second check valve, the first check valve is disposed between the heat regenerator and the refrigeration evaporator, and the second check valve is disposed between the refrigeration evaporator and the compressor.
Compared with the prior art, the refrigerator refrigeration method provided by the embodiment of the invention adopts different power cycle refrigeration systems in the refrigerating and freezing chamber: the refrigeration of a compressor and the refrigeration of a pump are realized, the electric power of the pump is much smaller than that of the compressor, the energy efficiency of a pump refrigeration system is high, and particularly, the refrigeration requirements of different compartments are realized by controlling cold air distribution by opening and closing an air door of a refrigerator with a refrigerating and freezing compartment. The heat regenerator is arranged behind the compressor, and the pumped low-temperature liquid refrigerant exchanges heat with the high-temperature gaseous refrigerant at the outlet of the compressor, so that the temperature of the refrigerant flowing to the refrigerating evaporator is not too low, the wet air in the refrigerating chamber is prevented from being frozen into ice on the refrigerating evaporator, and the defrosting operation of the refrigerating evaporator is reduced. In addition, the tail end of the freezing evaporator is provided with a liquid storage device, so that liquid impact generated in the running process of the compressor can be prevented.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (8)

1. A refrigerator, characterized by comprising:
a cabinet including a plurality of storage compartments;
the refrigerating system comprises a compressor, a heat regenerator, a condenser, a freezing evaporator, a liquid storage device, a first electromagnetic valve, a pump, a second electromagnetic valve and a refrigerating evaporator; the system comprises a liquid storage device, a freezing evaporator, a compressor, a heat regenerator, a first electromagnetic valve, a pump, a heat regenerator and a refrigerating evaporator, wherein a water inlet of the liquid storage device is connected with the freezing evaporator, a gas outlet of the liquid storage device is connected with the compressor, a water outlet of the liquid storage device is connected with the first electromagnetic valve, the first electromagnetic valve is connected with the pump, the pump is connected with the heat regenerator, an outlet of the heat regenerator is connected with the refrigerating evaporator, and the heat regenerator is used for exchanging heat between low-temperature liquid refrigerant output by the pump and high-temperature gaseous refrigerant output by the compressor; the second electromagnetic valve is connected with an input port of the freezing evaporator and an output port of the refrigerating evaporator and used for enabling high-temperature refrigerant flowing out of the refrigerating evaporator to flow into the freezing evaporator; the refrigeration evaporator is arranged between the compressor and the freezing evaporator;
the controller is configured to:
acquiring the temperature of a freezing evaporator of the freezing evaporator;
when the temperature of the freezing evaporator is lower than a preset evaporator temperature threshold value, opening the first electromagnetic valve to enable the pump to work;
acquiring the refrigerating temperature of the refrigerating chamber;
and when the refrigerating temperature is lower than a preset refrigerating temperature threshold value, closing the first electromagnetic valve so as to stop the pump.
2. The refrigerator of claim 1, wherein the controller is further configured to:
acquiring the freezing temperature of the freezing chamber;
and when the freezing temperature reaches a preset freezing temperature threshold value, opening the second electromagnetic valve.
3. The refrigerator of claim 1, wherein prior to said obtaining a freeze evaporator temperature of the freeze evaporator, the controller is configured to:
obtaining the freezing temperature of a freezing chamber in the refrigerator;
and starting the compressor when the freezing temperature is higher than a preset freezing starting temperature.
4. The refrigerator of claim 1, wherein the refrigeration system further comprises a dry filter disposed between the condenser and the freeze evaporator; the drying filter is used for filtering the physical dust carried in the flowing process of the refrigerant and adsorbing the residual moisture of the refrigeration system.
5. The refrigeration method of the refrigerator is characterized by being suitable for a refrigeration system in the refrigerator, wherein the refrigeration system comprises a compressor, a heat regenerator, a condenser, a freezing evaporator, a liquid storage device, a first electromagnetic valve, a pump, a second electromagnetic valve and a refrigerating evaporator; the system comprises a freezing evaporator, a liquid storage device, a compressor, a heat regenerator, a pump, a refrigerating evaporator and a refrigerating evaporator, wherein a water inlet of the liquid storage device is connected with the freezing evaporator, an air outlet of the liquid storage device is connected with the compressor, a water outlet of the liquid storage device is connected with a first electromagnetic valve, the first electromagnetic valve is connected with the pump, the pump is connected with the heat regenerator, an outlet of the heat regenerator is connected with the refrigerating evaporator, and the heat regenerator is used for exchanging heat between low-temperature liquid refrigerant output by the pump and high-temperature gaseous refrigerant output by the compressor; the second electromagnetic valve is connected with an input port of the freezing evaporator and an output port of the refrigerating evaporator and used for enabling high-temperature refrigerant flowing out of the refrigerating evaporator to flow into the freezing evaporator; the refrigeration evaporator is arranged between the compressor and the freezing evaporator; the refrigeration method of the refrigerator comprises the following steps:
acquiring the temperature of a freezing evaporator of the freezing evaporator;
when the temperature of the freezing evaporator is lower than a preset evaporator temperature threshold value, opening the first electromagnetic valve to enable the pump to work;
acquiring the refrigerating temperature of the refrigerating chamber;
and when the refrigerating temperature is lower than a preset refrigerating temperature threshold value, closing the first electromagnetic valve so as to stop the pump.
6. The method as claimed in claim 5, wherein the method further comprises:
acquiring the freezing temperature of the freezing chamber;
and when the freezing temperature reaches a preset freezing temperature threshold value, opening the second electromagnetic valve.
7. The method as claimed in claim 5, wherein before said obtaining a freeze evaporator temperature of said freeze evaporator, said method further comprises:
acquiring the freezing temperature of a freezing chamber in the refrigerator;
and starting the compressor when the freezing temperature is higher than a preset freezing starting temperature.
8. The refrigeration method as recited in claim 5 wherein said refrigeration system further includes a dry filter disposed between said condenser and said freeze evaporator; the filter-drier is used for filtering the physical dust carried in the flowing process of the refrigerant and adsorbing the residual moisture of the refrigeration system.
CN202110534763.4A 2021-05-17 2021-05-17 Refrigerator and refrigerating method thereof Active CN113915894B (en)

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Publication number Priority date Publication date Assignee Title
US7302807B2 (en) * 2002-03-28 2007-12-04 Matsushita Electric Industrial Co., Ltd. Refrigerating cycle device
US9562707B2 (en) * 2013-03-14 2017-02-07 Whirlpool Corporation Refrigerator cooling system having a secondary cooling loop
AU2018431327A1 (en) * 2018-07-05 2021-01-07 Electrolux Appliances Aktiebolag Refrigerator
US11268751B2 (en) * 2018-09-14 2022-03-08 Lg Electronics Inc. Refrigerator and method for controlling the same
CN110145914A (en) * 2019-06-10 2019-08-20 天津商业大学 A kind of domestic refrigerator introducing natural cooling source

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