CN114608257A - Refrigerating system of three-system refrigerator and control method - Google Patents
Refrigerating system of three-system refrigerator and control method Download PDFInfo
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- CN114608257A CN114608257A CN202210235830.7A CN202210235830A CN114608257A CN 114608257 A CN114608257 A CN 114608257A CN 202210235830 A CN202210235830 A CN 202210235830A CN 114608257 A CN114608257 A CN 114608257A
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- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000005057 refrigeration Methods 0.000 claims abstract description 274
- 238000007710 freezing Methods 0.000 claims abstract description 71
- 230000008014 freezing Effects 0.000 claims abstract description 71
- 238000009833 condensation Methods 0.000 claims description 12
- 230000005494 condensation Effects 0.000 claims description 2
- 238000004781 supercooling Methods 0.000 abstract description 4
- 239000000110 cooling liquid Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
- F25D19/04—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors with more than one refrigeration unit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
- F25B41/42—Arrangements for diverging or converging flows, e.g. branch lines or junctions
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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
- F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a refrigeration system of a three-system refrigerator and a control method, and relates to the technical field of refrigerators. The refrigeration system comprises a first refrigeration circulation system, a second refrigeration circulation system and a third refrigeration circulation system, wherein when three circulation systems have refrigeration requests at the same time, the first refrigeration circulation system operates, three evaporators refrigerate at the same time, the refrigeration set temperature is high, and the shutdown point is reached at first; the electric valve is switched to a second refrigeration circulating system, the temperature-changing evaporator and the freezing evaporator continue to refrigerate, the temperature-changing evaporator is always in a refrigeration state, and the refrigeration cycle of the temperature-changing chamber is shortened; and after the temperature-changing chamber reaches the stop point, the electric valve is switched to a third refrigeration cycle system, and the refrigeration evaporator performs independent refrigeration to finally finish all refrigeration. The invention adopts three refrigeration circulating systems to operate in sequence, controls the three evaporators to refrigerate synchronously and stop in sequence, thereby reaching the stop point temperature of the three chambers, saving energy and avoiding the phenomenon of freezing and supercooling.
Description
Technical Field
The invention belongs to the technical field of refrigerators, and particularly relates to a refrigeration system of a three-system refrigerator and a control method of the refrigeration system of the three-system refrigerator.
Background
At present, the traditional three-system refrigerator is that a refrigeration evaporator and a variable-temperature evaporator are connected in parallel and then connected in series with a freezing evaporator, the common refrigeration logic is refrigeration and variable-temperature alternate refrigeration, the refrigeration and the variable-temperature alternate refrigeration are switched to a freezing chamber for independent refrigeration after the refrigeration and the variable-temperature alternate refrigeration reach the shutdown point, and the refrigeration is finished after the refrigeration and the variable-temperature alternate refrigeration reach the freezing shutdown point. However, the refrigeration logic has the following disadvantages:
refrigeration and temperature change can only be carried out in a refrigeration state, when one is cooled and the other is in temperature return, the temperature rises too fast under a high load condition, and therefore two compartments are difficult to reach a stop point at the same time. On one hand, energy waste is caused; on the other hand, the two compartments are always in an alternate refrigeration state, and the refrigeration is always in a passive refrigeration state, so that the phenomenon of refrigeration and supercooling is easy to occur, and the storage of food is influenced.
Disclosure of Invention
The invention aims to provide a refrigeration system of a three-system refrigerator, which adopts three refrigeration circulation systems to operate in sequence and controls three evaporators to synchronously refrigerate and stop in sequence, thereby achieving the stop point temperature of three compartments in sequence and solving the problems that the refrigeration logic of the existing three-system refrigerator easily causes energy waste and the phenomenon of freezing and supercooling occurs. Another object of the present invention is to provide a control method of a refrigerating system of a three-system refrigerator.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a refrigeration system of a three-system refrigerator and a control method thereof. The first refrigeration circulating system comprises a refrigeration main circuit and a first refrigeration branch circuit, and the first refrigeration branch circuit is formed by sequentially connecting a first branch circuit electric valve, a refrigeration capillary tube, a refrigeration evaporator, a variable temperature evaporator and a freezing evaporator in series; the first refrigeration branch and the refrigeration main circuit are connected end to form a closed loop. The second refrigeration circulating system comprises a main refrigeration path and a second refrigeration branch path, and the second refrigeration branch path is formed by sequentially connecting a second branch path electric valve, a variable temperature capillary tube, a variable temperature evaporator and a freezing evaporator in series; the second refrigeration branch circuit and the refrigeration main circuit are connected end to form a closed loop. The third refrigeration circulating system comprises a main refrigeration path and a third refrigeration branch path, and the third refrigeration branch path is formed by sequentially connecting a third branch path electric valve, a refrigeration capillary tube and a refrigeration evaporator in series; and the third refrigeration branch and the refrigeration main circuit are connected end to form a closed loop.
As a preferred technical scheme of the present invention, the main refrigeration path is formed by sequentially connecting a compressor, a condenser, an anti-condensation pipe, a filter, and a one-in three-out electric valve in series, an inlet of the one-in three-out electric valve is connected to the main refrigeration path, and the one-in three-out electric valve includes an outlet a, an outlet b, and an outlet c. The first refrigeration circulating system comprises a refrigeration main circuit and a first refrigeration branch circuit, and the first refrigeration branch circuit is formed by sequentially connecting a refrigeration capillary tube, a refrigeration evaporator, a variable temperature evaporator and a freezing evaporator in series; one end of the first refrigeration branch is connected with the outlet a, and the other end of the first refrigeration branch is connected with the compressor to form a closed loop. The second refrigeration circulating system comprises a refrigeration main circuit and a second refrigeration branch circuit, and the second refrigeration branch circuit is formed by sequentially connecting a variable temperature capillary tube, a variable temperature evaporator and a freezing evaporator in series; one end of the second refrigeration branch is connected with the outlet b, and the other end of the second refrigeration branch is connected with the compressor to form a closed loop. The third refrigeration circulating system comprises a refrigeration main circuit and a third refrigeration branch circuit, and the third refrigeration branch circuit is formed by sequentially connecting a refrigeration capillary tube and a refrigeration evaporator in series; one end of the third refrigeration branch is connected with the outlet c, and the other end of the third refrigeration branch is connected with the compressor to form a closed loop. And the one-inlet three-outlet electric valve is adopted, so that the system operation can be met, the installation space can be saved, and the production process can be reduced.
A control method of a refrigeration system of a three-system refrigerator comprises the following steps:
s1: the three systems send out refrigeration requests at the same time, the outlet a, the outlet b and the outlet c are opened, the first refrigeration circulating system starts to work, and the refrigeration evaporator, the variable temperature evaporator and the freezing evaporator in the first refrigeration circulating system start to refrigerate. S2: the set stop point temperature of the refrigeration is higher than the temperature of the temperature change and the freezing temperature, so that the refrigeration firstly reaches the stop point, when the refrigeration reaches the stop point, the outlet a and the outlet c are closed, the outlet b is opened, the second refrigeration circulation system starts to work, and the temperature change evaporator and the freezing evaporator in the second refrigeration circulation system still keep the refrigeration state. S3: the temperature of the shutdown point set by the temperature change is higher than that of the freezing point, so that the temperature change reaches the shutdown point before the freezing point, when the temperature change reaches the shutdown point, the outlet a and the outlet b are closed, the outlet c is opened, the third refrigeration cycle system starts to work, and the freezing evaporator in the third refrigeration cycle system independently keeps a refrigeration state. S4: when the freezing point also reaches the stop point, the system stops running and the refrigeration is finished.
The invention has the following beneficial effects:
according to the invention, by adopting the first refrigeration cycle system, the second refrigeration cycle system and the third refrigeration cycle system, firstly, the first refrigeration cycle system controls the three evaporators to refrigerate synchronously; when the refrigeration reaches the stop point, the second refrigeration circulating system starts to work, and the variable-temperature evaporator and the freezing evaporator still keep the refrigeration state; when the temperature change reaches the stop point, the refrigeration request is not made, the third refrigeration circulating system starts to work, and the refrigeration evaporator independently keeps the refrigeration state, so that the stop point temperature of the three compartments is reached in sequence, the energy is saved, and the phenomenon of refrigeration and supercooling is avoided.
Of course, it is not necessary for any product to practice the invention to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a system according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a system according to a second embodiment of the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1-a compressor, 2-a condenser, 3-an anti-condensation pipe, 4-a filter, 5-a refrigeration capillary, 6-a refrigeration evaporator, 7-a temperature-changing evaporator, 8-a freezing evaporator, 9-a temperature-changing capillary, 10-a freezing capillary, 11-a first branch electric valve, 12-a second branch electric valve, 13-a third branch electric valve and 14-a one-inlet three-outlet electric valve.
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.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
Example one
Referring to fig. 1, the present invention is a refrigeration system of a three-system refrigerator, including a main refrigeration path, a first refrigeration cycle system and a second refrigeration cycle system, wherein the main refrigeration path is formed by connecting a compressor 1, a condenser 2, a condensation preventing pipe 3 and a filter 4 in series.
The first refrigeration circulating system comprises a main refrigeration path and a first refrigeration branch path, and the first refrigeration branch path is formed by sequentially connecting a first branch path electric valve 11, a refrigeration capillary tube 5, a refrigeration evaporator 6, a variable temperature evaporator 7 and a freezing evaporator 8 in series; the first refrigeration branch and the refrigeration main circuit are connected end to form a closed loop. When the first refrigeration cycle system works, cooling liquid is compressed by the compressor 1, then flows through the condenser 2, the anti-condensation pipe 3, the filter 4, the first branch electric valve 11, the refrigeration capillary 5, the refrigeration evaporator 6, the variable temperature evaporator 7 and the freezing evaporator 8 in sequence, and finally flows back to the compressor 1. In the circulation process, the refrigerating evaporator 6, the variable temperature evaporator 7 and the freezing evaporator 8 all run for refrigeration, and the refrigeration of the refrigerating chamber, the variable temperature chamber and the freezing chamber is realized at the same time.
The second refrigeration circulating system comprises a main refrigeration path and a second refrigeration branch path, and the second refrigeration branch path is formed by sequentially connecting a second branch path electric valve 12, a variable temperature capillary tube 9, a variable temperature evaporator 7 and a freezing evaporator 8 in series; the second refrigeration branch circuit and the refrigeration main circuit are connected end to form a closed loop. When the second refrigeration cycle system works, the cooling liquid is compressed by the compressor 1, then flows through the condenser 2, the anti-condensation pipe 3, the filter 4, the second branch electric valve 12, the variable temperature capillary tube 9, the variable temperature evaporator 7 and the freezing evaporator 8 in sequence, and finally flows back to the compressor 1. In the circulation process, the variable temperature evaporator 7 and the freezing evaporator 8 run for refrigeration, and the variable temperature chamber and the freezing chamber are simultaneously refrigerated.
The third refrigeration circulation system comprises a main refrigeration path and a third refrigeration branch path, and the third refrigeration branch path is formed by sequentially connecting a third branch path electric valve 13, a refrigeration capillary tube 10 and a refrigeration evaporator 8 in series; the third refrigeration branch circuit and the refrigeration main circuit are connected end to form a closed loop. When the third refrigeration cycle system works, the cooling liquid is compressed by the compressor 1, then flows through the condenser 2, the anti-condensation pipe 3, the filter 4, the third branch electric valve 13, the freezing capillary tube 10 and the freezing evaporator 8 in sequence, and finally flows back to the compressor 1. In the circulation process, only the freezing evaporator 8 operates for refrigeration, and refrigeration of the freezing chamber is realized.
The control method of the embodiment includes the following steps:
s1: the three compartments send out refrigeration requests at the same time, the first branch electric valve 11 is opened, the second branch electric valve 12 and the third branch electric valve 13 are closed, the first refrigeration cycle system starts to work, and the refrigeration evaporator 6, the variable temperature evaporator 7 and the freezing evaporator 8 in the first refrigeration cycle system start to refrigerate;
s2: the set stop point temperature of the refrigeration is higher than the temperature of the variable temperature and the freezing temperature, so that the refrigeration firstly reaches the stop point, when the refrigeration reaches the stop point, the first branch electric valve 11 and the second branch electric valve 12 are closed, the second branch electric valve 12 is opened, the second refrigeration cycle system starts to work, and the variable temperature evaporator 7 and the freezing evaporator 8 in the second refrigeration cycle system still keep the refrigeration state;
s3: because the temperature of the shutdown point set by the variable temperature is higher than that of the freezing point, the variable temperature reaches the shutdown point before the freezing point, when the variable temperature reaches the shutdown point, the first branch electric valve 11 and the second branch electric valve 12 are closed, the second branch electric valve 12 is opened, the third refrigeration cycle system starts to work, and the freezing evaporator 8 in the third refrigeration cycle system independently keeps a refrigeration state;
s4: when the freezing point also reaches the stop point, the system stops running and the refrigeration is finished.
Example two
Referring to fig. 2, an electric valve 14 for one inlet and three outlets is used to replace the electric valve 11 for the first branch, the electric valve 12 for the second branch and the electric valve 13 for the third branch, the main refrigeration path is formed by connecting the compressor 1, the condenser 2, the anti-condensation pipe 3, the filter 4 and the electric valve 14 for one inlet and three outlets in series, the inlet of the electric valve 14 for one inlet and three outlets is connected to the main refrigeration path, and the electric valve 14 for one inlet and three outlets includes an outlet a, an outlet b and an outlet c. And the one-inlet three-outlet electric valve 14 is adopted, so that the system operation can be met, the installation space can be saved, and the production process can be reduced.
The first refrigeration circulating system comprises a refrigeration main circuit and a first refrigeration branch circuit, wherein the first refrigeration branch circuit is formed by sequentially connecting a refrigeration capillary tube 5, a refrigeration evaporator 6, a variable temperature evaporator 7 and a freezing evaporator 8 in series; one end of the first refrigeration branch is connected with the outlet a, and the other end of the first refrigeration branch is connected with the compressor 1 to form a closed loop. When the first refrigeration cycle system works, cooling liquid is compressed by the compressor 1, then flows through the condenser 2, the anti-condensation pipe 3, the filter 4, the one-inlet three-outlet electric valve 14, the refrigeration capillary 5, the refrigeration evaporator 6, the variable temperature evaporator 7 and the freezing evaporator 8 in sequence, and finally flows back to the compressor 1. In the circulation process, the cooling liquid flows out from the outlet a of the one-inlet three-outlet electric valve 14, and the refrigerating evaporator 6, the variable temperature evaporator 7 and the freezing evaporator 8 all run for refrigeration, so that the refrigerating chamber, the variable temperature chamber and the freezing chamber are simultaneously refrigerated.
The second refrigeration cycle system comprises a main refrigeration path and a second refrigeration branch path, and the second refrigeration branch path is formed by sequentially connecting a temperature-changing capillary tube 9, a temperature-changing evaporator 7 and a freezing evaporator 8 in series; one end of the second refrigeration branch is connected with the outlet b, and the other end of the second refrigeration branch is connected with the compressor 1 to form a closed loop. When the second refrigeration cycle system works, the cooling liquid is compressed by the compressor 1, then flows through the condenser 2, the anti-condensation pipe 3, the filter 4, the one-inlet three-outlet electric valve 14, the variable temperature capillary 9, the variable temperature evaporator 7 and the freezing evaporator 8 in sequence, and finally flows back to the compressor 1. In the circulation process, the cooling liquid flows out from an outlet b of the one-inlet three-outlet electric valve 14, and the variable temperature evaporator 7 and the freezing evaporator 8 run for refrigeration, so that the variable temperature chamber and the freezing chamber are simultaneously refrigerated.
The third refrigeration circulating system comprises a refrigeration main circuit and a third refrigeration branch circuit, and the third refrigeration branch circuit is formed by sequentially connecting a refrigeration capillary tube 10 and a refrigeration evaporator 8 in series; one end of the third refrigeration branch is connected with the outlet c, and the other end of the third refrigeration branch is connected with the compressor 1 to form a closed loop. When the third refrigeration cycle system works, the cooling liquid is compressed by the compressor 1, then flows through the condenser 2, the anti-condensation pipe 3, the filter 4, the one-inlet three-outlet electric valve 14, the freezing capillary tube 10 and the freezing evaporator 8 in sequence, and finally flows back to the compressor 1. In the circulation process, the cooling liquid flows out from the outlet c of the one-inlet three-outlet electric valve 14, and only the freezing evaporator 8 operates for refrigeration, so that refrigeration of the freezing chamber is realized.
A control method of a refrigeration system of a three-system refrigerator comprises the following steps:
s1: the three compartments send out refrigeration requests at the same time, the outlet a is opened, the outlet b and the outlet c are closed, the first refrigeration cycle system starts to work, and the refrigeration evaporator 6, the variable temperature evaporator 7 and the freezing evaporator 8 in the first refrigeration cycle system start to refrigerate;
s2: the set stop point temperature of the refrigeration is higher than the temperature of the temperature change and the freezing temperature, so that the refrigeration firstly reaches the stop point, when the refrigeration reaches the stop point, the outlet a and the outlet c are closed, the outlet b is opened, the second refrigeration cycle system starts to work, and the temperature change evaporator 7 and the freezing evaporator 8 in the second refrigeration cycle system still keep the refrigeration state;
s3: because the temperature of the shutdown point set by the variable temperature is higher than that of the freezing point, the variable temperature reaches the shutdown point first than the freezing point, when the variable temperature reaches the shutdown point, the outlet a and the outlet b are closed, the outlet c is opened, the third refrigeration cycle system starts to work, and the freezing evaporator 8 in the third refrigeration cycle system independently keeps a refrigeration state;
s4: when the freezing point also reaches the stop point, the system stops running and the refrigeration is finished.
In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (3)
1. A refrigeration system of a three-system refrigerator, comprising:
the refrigeration main path is formed by sequentially connecting a compressor (1), a condenser (2), an anti-condensation pipe (3) and a filter (4) in series;
the first refrigeration cycle system comprises a main refrigeration path and a first refrigeration branch path, wherein the first refrigeration branch path is formed by sequentially connecting a first branch path electric valve (11), a refrigeration capillary tube (5), a refrigeration evaporator (6), a variable temperature evaporator (7) and a freezing evaporator (8) in series; the first refrigeration branch and the refrigeration main circuit are connected end to form a closed loop;
the second refrigeration cycle system comprises a main refrigeration path and a second refrigeration branch path, and the second refrigeration branch path is formed by sequentially connecting a second branch path electric valve (12), a variable temperature capillary tube (9), a variable temperature evaporator (7) and a freezing evaporator (8) in series; the second refrigeration branch circuit and the refrigeration main circuit are connected end to form a closed loop;
the third refrigeration circulation system comprises a main refrigeration path and a third refrigeration branch path, and the third refrigeration branch path is formed by sequentially connecting a third branch path electric valve (13), a freezing capillary tube (10) and a freezing evaporator (8) in series; and the third refrigeration branch and the refrigeration main circuit are connected end to form a closed loop.
2. The refrigerating system of a three-system refrigerator according to claim 1, wherein the main refrigerating path is composed of a compressor (1), a condenser (2), a condensation preventing pipe (3), a filter (4) and a three-in three-out electric valve (14) connected in series in sequence, the inlet of the three-in three-out electric valve (14) is connected with the main refrigerating path, and the three-in three-out electric valve (14) comprises an outlet a, an outlet b and an outlet c;
the first refrigeration circulating system comprises a refrigeration main circuit and a first refrigeration branch circuit, and the first refrigeration branch circuit is formed by sequentially connecting a refrigeration capillary tube (5), a refrigeration evaporator (6), a variable temperature evaporator (7) and a freezing evaporator (8) in series; one end of the first refrigeration branch is connected with the outlet a, and the other end of the first refrigeration branch is connected with the compressor (1) to form a closed loop;
the second refrigeration circulating system comprises a refrigeration main circuit and a second refrigeration branch circuit, and the second refrigeration branch circuit is formed by sequentially connecting a variable temperature capillary tube (9), a variable temperature evaporator (7) and a freezing evaporator (8) in series; one end of the second refrigeration branch is connected with the outlet b, and the other end of the second refrigeration branch is connected with the compressor (1) to form a closed loop;
the third refrigeration circulating system comprises a refrigeration main circuit and a third refrigeration branch circuit, and the third refrigeration branch circuit is formed by sequentially connecting a refrigeration capillary tube (10) and a refrigeration evaporator (8) in series; one end of the third refrigeration branch is connected with the outlet c, and the other end of the third refrigeration branch is connected with the compressor (1) to form a closed loop.
3. A control method of a refrigeration system of a three-system refrigerator is characterized by comprising the following steps:
s1: the three compartments send out refrigeration requests at the same time, the outlet a is opened, the outlet b and the outlet c are closed, the first refrigeration cycle system starts to work, and a refrigeration evaporator (6), a variable temperature evaporator (7) and a freezing evaporator (8) in the first refrigeration cycle system start to refrigerate;
s2: the set stop point temperature of the refrigeration is higher than the temperature of the temperature change and the freezing temperature, so that the refrigeration firstly reaches the stop point, when the refrigeration reaches the stop point, the outlet a and the outlet c are closed, the outlet b is opened, the second refrigeration circulation system starts to work, and the temperature change evaporator (7) and the freezing evaporator (8) in the second refrigeration circulation system still keep the refrigeration state;
s3: because the temperature of the shutdown point set by the variable temperature is higher than that of the freezing point, the variable temperature reaches the shutdown point first than the freezing point, when the variable temperature reaches the shutdown point, the outlet a and the outlet b are closed, the outlet c is opened, the third refrigeration cycle system starts to work, and the freezing evaporator (8) in the third refrigeration cycle system independently keeps a refrigeration state;
s4: when the freezing point also reaches the stop point, the system stops running and the refrigeration is finished.
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2022
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