CN112097411B - Double-circulation refrigerating system of variable frequency refrigerator and control method thereof - Google Patents
Double-circulation refrigerating system of variable frequency refrigerator and control method thereof Download PDFInfo
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- CN112097411B CN112097411B CN202011146257.XA CN202011146257A CN112097411B CN 112097411 B CN112097411 B CN 112097411B CN 202011146257 A CN202011146257 A CN 202011146257A CN 112097411 B CN112097411 B CN 112097411B
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B2500/00—Problems to be solved
- F25B2500/28—Means for preventing liquid refrigerant entering into the compressor
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
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- General Engineering & Computer Science (AREA)
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- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a double-circulation refrigerating system of a variable frequency refrigerator and a control method thereof, and relates to the technical field of refrigerators. The invention comprises a variable frequency compressor, wherein an air outlet of the variable frequency compressor is sequentially connected with an anti-condensation pipe, a condenser, a filter and a one-in two-out electric switching valve; the two-in one-out electric switching valve and the one-in two-out electric switching valve are connected with a first refrigeration branch and a second refrigeration branch; the first refrigeration branch comprises a first capillary tube, a first evaporator and a first liquid storage device; and the refrigerating branch circuit II comprises a second capillary tube, a second evaporator and a second liquid storage device. According to the invention, the liquid reservoirs are respectively arranged on the two refrigeration branches which are arranged in parallel, and the transfer of the refrigerant in the two chambers is controlled through the switches of the two-in one-out electric switching valve and the one-in two-out electric switching valve, so that the refrigerant is fully utilized.
Description
Technical Field
The invention belongs to the technical field of refrigerators, and particularly relates to a double-circulation refrigeration system of a frequency conversion refrigerator and a control method thereof.
Background
In the double-circulation or multi-circulation refrigeration system refrigerator in the prior art, a series-parallel connection refrigeration system and a pure-parallel connection refrigeration system are arranged, when the series-parallel connection system independently refrigerates in a compartment with a short refrigeration branch, the quantity of refrigerant is too much, and the problem of frosting and dripping of a return air pipe is easy to occur.
Disclosure of Invention
The invention aims to provide a double-circulation refrigerating system of a variable frequency refrigerator and a control method thereof, wherein liquid accumulators are respectively arranged on two parallel refrigerating branches, the transfer of refrigerants in two chambers is controlled through switches of a second electric switching valve and a first electric switching valve, the refrigerants are fully utilized, when a certain chamber is independently refrigerated, the refrigerants in other chamber refrigerating branches are not left, and the refrigerating efficiency of the system is improved; the low-rotating-speed starting operation of the variable-frequency compressor is utilized, the suction pressure is reduced, the phenomenon that the refrigerant excessively enters the compressor is prevented, the working load of the compressor is too large, the liquid impact phenomenon is caused, and the problem that the temperature of the air return pipe drops suddenly when the compressor is started to frost the air return pipe is prevented.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a double-circulation refrigerating system of a variable frequency refrigerator, which comprises a variable frequency compressor, wherein an air outlet of the variable frequency compressor is sequentially connected with an anti-condensation pipe, a condenser, a filter and a first electric switching valve, and an air inlet of the variable frequency compressor is connected with a second electric switching valve; the second electric switching valve and the first electric switching valve are connected with a first refrigeration branch and a second refrigeration branch; the first electric switching valve is a one-in two-out electric switching valve, and the second electric switching valve is a two-in one-out electric switching valve;
the first refrigeration branch comprises a first capillary tube, a first evaporator and a first liquid storage device which are sequentially connected between a first electric switching valve and a second electric switching valve;
the refrigerating branch II comprises a second capillary tube, a second evaporator and a second liquid storage device which are sequentially connected between the first electric switching valve and the second electric switching valve.
Furthermore, two outlets of the first electric switching valve are respectively communicated with the first capillary tube and the second capillary tube; and two inlets of the second electric switching valve are respectively communicated with the first liquid storage device and the second liquid storage device.
Further, the first refrigeration branch is arranged in the compartment A and used for refrigerating the compartment A;
and the refrigerating branch II is arranged in the compartment B and is used for refrigerating the compartment B.
A control method of a double-circulation refrigerating system of an inverter refrigerator is characterized in that when a compartment A and/or a compartment B has a refrigerating requirement, an inverter compressor is started to operate at a low rotating speed.
Further, when the compartment A and the compartment B have refrigeration demands at the same time, the compartment with the high level is selected for refrigeration according to a refrigeration level priority judgment principle, and when the stop point is reached, the other compartment is switched to for refrigeration.
Further, Stp1, when compartment A puts forward a refrigeration demand for the first time, the second electric switching valve and the first electric switching valve are both switched to a first refrigeration branch, and the first refrigeration branch is conducted to refrigerate compartment A;
stp2, when the compartment A reaches a shutdown point to stop refrigeration and the compartment B has a refrigeration demand, closing the first electric switching valve, communicating the second electric switching valve with the outlet end of the first liquid storage device, continuously operating for t seconds, closing the passage between the second electric switching valve and the first liquid storage device, controlling the second electric switching valve to be communicated with the second liquid storage device, controlling the first electric switching valve to be communicated with the second refrigeration branch circuit, and refrigerating through the second refrigeration branch circuit;
stp3, when the refrigeration requirement of the compartment B is finished and the compartment A has the refrigeration requirement, closing the first electric switching valve at the moment, communicating the second electric switching valve with the second liquid storage device at the moment, continuously operating for t seconds, closing the passage between the second electric switching valve and the second liquid storage device, switching to communicate with the first liquid storage device, controlling the first electric switching valve to be communicated with the first refrigeration branch, and refrigerating through the first refrigeration branch;
stp4, when the refrigeration demands of the compartment A and the compartment B are finished, controlling the inverter compressor to stop running.
Further, t is more than or equal to 300 and more than or equal to 30.
Further, when the compartment A has a refrigeration demand alone, the first electric switching valve is controlled to be closed, the second electric switching valve is controlled to be communicated with the second liquid storage device, after t3 seconds, the second electric switching valve is controlled to be communicated with the first liquid storage device, the second electric switching valve is closed, the first electric switching valve is controlled to be communicated with the refrigeration branch, and the compartment A is refrigerated;
when the compartment B has a refrigeration requirement independently, the first electric switching valve is controlled to be closed, the second electric switching valve is communicated with the first liquid storage device, the second electric switching valve is controlled to be communicated with the second liquid storage device after t4 seconds of operation, the second electric switching valve is controlled to be closed with the first liquid storage device, and then the first electric switching valve is controlled to be communicated with the refrigeration branch circuit II to refrigerate the compartment B.
Further, the values of t3 and t4 are the same and are both between 30 and 300.
The invention has the following beneficial effects:
according to the invention, the liquid reservoirs are respectively arranged on the two refrigeration branches which are arranged in parallel, and the transfer of the refrigerants in the two chambers is controlled through the switches of the second electric switching valve and the first electric switching valve, so that the refrigerants are fully utilized, and when a certain chamber is independently refrigerated, the refrigerants in the refrigeration branches of other chambers are not left, so that the refrigeration efficiency of the system is improved; the low-rotating-speed starting operation of the variable-frequency compressor is utilized, the suction pressure is reduced, the phenomenon that the refrigerant excessively enters the compressor is prevented, the working load of the compressor is too large, the liquid impact phenomenon is caused, and the problem that the temperature of the air return pipe drops suddenly when the compressor is started to frost the air return pipe is prevented.
Of course, it is not necessary for any product in which the invention is practiced 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 block diagram of a dual cycle refrigeration system according to 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.
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.
Referring to fig. 1, the present invention is a dual cycle refrigeration system of a variable frequency refrigerator, comprising a variable frequency compressor 1, wherein an air outlet of the variable frequency compressor 1 is sequentially connected with an anti-condensation pipe 2, a condenser 3, a filter 4 and a first electric switching valve 5, and an air inlet of the variable frequency compressor 1 is connected with a second electric switching valve 6; the second electric switching valve 6 and the first electric switching valve 5 are connected with a first refrigeration branch and a second refrigeration branch; the condensation preventing pipe 2, the condenser 3, the filter 4 and the first electric switching valve 5 form a refrigeration loop; the first electric changeover valve 5 is a one-in two-out electric changeover valve, and the second electric changeover valve 6 is a two-in one-out electric changeover valve.
The first refrigeration branch comprises a first capillary tube 7, a first evaporator 9 and a first liquid storage device 11 which are sequentially connected between a first electric switching valve 5 and a second electric switching valve 6;
the refrigerating branch II comprises a second capillary tube 8, a second evaporator 10 and a second liquid storage device 12 which are sequentially connected between the first electric switching valve 5 and the second electric switching valve 6.
Preferably, two outlets of the first electric switching valve 5 are respectively communicated with the first capillary 7 and the second capillary 8; two inlets of the second electric changeover valve 6 are respectively communicated with the first reservoir 11 and the second reservoir 12.
Preferably, the first refrigeration branch is arranged in the compartment a100 for refrigerating the compartment a 100;
the second cooling branch is provided in the compartment B200 to cool the compartment B200.
A control method of a double-circulation refrigerating system of an inverter refrigerator is characterized in that when a compartment A100 and/or a compartment B200 has a refrigerating requirement, a compressor of an inverter compressor 1 is started to operate at a low rotating speed.
Preferably, when the compartment a100 and the compartment B200 have cooling demands at the same time, the compartment with the higher level is selected for cooling according to the cooling level priority determination principle, and when the stop point is reached, the other compartment is switched to for cooling.
Stp1, when compartment A100 first puts forward a refrigeration demand, the second electric switching valve 6 and the first electric switching valve 5 are both switched to a first refrigeration branch, and the first refrigeration branch is conducted to refrigerate compartment A100;
stp2, when the compartment A100 reaches a shutdown point and stops cooling and the compartment B200 has a cooling demand, closing the first electric switching valve 5, and when the second electric switching valve 6 is communicated with the outlet end of the first liquid reservoir 11, continuing to operate for t seconds, closing the passage between the second electric switching valve 6 and the first liquid reservoir 11, controlling the second electric switching valve 6 to be communicated with the second liquid reservoir 12, controlling the first electric switching valve 5 to be communicated with the cooling branch II, and cooling through the cooling branch II;
in this step, during the time of continuing to operate for t seconds, the refrigerant in the first accumulator 11 will be discharged into the refrigeration circuit first, after being completely discharged, the second accumulator 12 will be also discharged into the refrigeration circuit through the switching of the second electric switching valve 6, at this time, the refrigerant in the system will be fully utilized;
stp3, when the refrigeration requirement of the compartment B200 is finished and the compartment A100 has the refrigeration requirement, closing the first electric switching valve 5, communicating the second electric switching valve 6 with the second liquid storage device 12, continuously operating for t seconds, closing the passage between the second electric switching valve 6 and the second liquid storage device 12, switching to communicate with the first liquid storage device 11, controlling the first electric switching valve 5 to be communicated with the first refrigeration branch, and refrigerating through the first refrigeration branch;
stp4, when the cooling demand of the compartment a100 and the compartment B200 is completed, the inverter compressor 1 is controlled to stop operating.
Preferably, 300 ≧ t ≧ 30.
Preferably, when the compartment a100 has a single refrigeration demand, the first electric switching valve 5 is controlled to be closed, the second electric switching valve 6 is controlled to be communicated with the second reservoir 12 at this time, after t3 seconds, the second electric switching valve 6 is controlled to be communicated with the first reservoir 11, the second electric switching valve 6 is controlled to be closed with the second reservoir 12 at this time, and then the first electric switching valve 5 is controlled to be communicated with the refrigeration branch to refrigerate the compartment a 100;
when the compartment B200 has a unique refrigeration demand, the first electric changeover valve 5 is controlled to be closed, the second electric changeover valve 6 is communicated with the first liquid reservoir 11, after t4 seconds, the second electric changeover valve 6 is controlled to be communicated with the second liquid reservoir 12, the second electric changeover valve 6 is closed with the first liquid reservoir 11, and the first electric changeover valve 5 is controlled to be communicated with the refrigeration branch line two to refrigerate the compartment B200.
Preferably, t3 and t4 have the same value and are both between 30 and 300.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to 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 utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (4)
1. A control method of a double-circulation refrigerating system of an inverter refrigerator comprises an inverter compressor (1), wherein an air outlet of the inverter compressor (1) is sequentially connected with a condensation preventing pipe (2), a condenser (3), a filter (4) and a first electric switching valve (5), and an air inlet of the inverter compressor (1) is connected with a second electric switching valve (6); the second electric switching valve (6) and the first electric switching valve (5) are connected with a first refrigeration branch and a second refrigeration branch, and the first refrigeration branch comprises a first capillary (7), a first evaporator (9) and a first liquid storage device (11) which are sequentially connected between the first electric switching valve (5) and the second electric switching valve (6); the refrigerating branch II comprises a second capillary tube (8), a second evaporator (10) and a second liquid storage device (12) which are sequentially connected between the first electric switching valve (5) and the second electric switching valve (6); two outlets of the first electric switching valve (5) are respectively communicated with a first capillary tube (7) and a second capillary tube (8); two inlets of the second electric switching valve (6) are respectively communicated with the first liquid storage device (11) and the second liquid storage device (12); the first refrigeration branch is arranged in the compartment A (100) and used for refrigerating the compartment A (100); the refrigerating branch circuit II is arranged in the compartment B (200) and is used for refrigerating the compartment B (200), and when the compartment A (100) and/or the compartment B (200) have refrigerating requirements, the compressor of the variable frequency compressor (1) is started to operate at a low rotating speed; when the compartment A (100) and the compartment B (200) have refrigeration demands at the same time, selecting a compartment with a high level for refrigeration according to a refrigeration level priority judgment principle, and switching to another compartment for refrigeration when a stop point is reached;
the first electric switching valve (5) is a one-in two-out electric switching valve, and the second electric switching valve (6) is a two-in one-out electric switching valve;
the control method is characterized by comprising the following steps:
stp1, when the compartment A (100) first puts forward a refrigeration demand, the second electric switching valve (6) and the first electric switching valve (5) are switched to a first refrigeration branch, and the first refrigeration branch is conducted to refrigerate the compartment A (100);
stp2, when the compartment A (100) reaches a stop point to stop refrigeration and the compartment B (200) has a refrigeration demand, closing the first electric switching valve (5), communicating the second electric switching valve (6) with the outlet end of the first liquid reservoir (11), continuously operating for t1 seconds, closing the passage between the second electric switching valve (6) and the first liquid reservoir (11), controlling the second electric switching valve (6) to be communicated with the second liquid reservoir (12), controlling the first electric switching valve (5) to be communicated with the second refrigeration branch, and refrigerating through the second refrigeration branch;
stp3, when the refrigeration requirement of the compartment B (200) is finished and the compartment A (100) has the refrigeration requirement, closing the first electric switching valve (5), communicating the second electric switching valve (6) with the second liquid reservoir (12), continuously operating for t2 seconds, closing a passage between the second electric switching valve (6) and the second liquid reservoir (12), switching to be communicated with the first liquid reservoir (11), controlling the first electric switching valve (5) to be communicated with the first refrigeration branch, and refrigerating through the first refrigeration branch;
stp4, when the refrigeration demands of the compartment A (100) and the compartment B (200) are completed, controlling the inverter compressor (1) to stop running.
2. The method as claimed in claim 1, wherein t1 and t2 have the same value, 300 ≥ t2 ≥ 30.
3. The control method of the dual-cycle refrigeration system of the inverter refrigerator according to claim 1 or 2, wherein when the compartment a (100) has a refrigeration demand alone, the first electric switching valve (5) is controlled to be closed, the second electric switching valve (6) is controlled to be communicated with the second liquid reservoir (12), after t3 seconds of operation, the second electric switching valve (6) is controlled to be communicated with the first liquid reservoir (11), the second electric switching valve (6) is controlled to be closed with the second liquid reservoir (12), and the first electric switching valve (5) is controlled to be communicated with the refrigeration branch circuit to refrigerate the compartment a (100);
when the compartment B (200) has a refrigeration demand alone, the first electric switching valve (5) is controlled to be closed, the second electric switching valve (6) is communicated with the first liquid storage device (11), after t4 seconds of operation, the second electric switching valve (6) is controlled to be communicated with the second liquid storage device (12), the second electric switching valve (6) is closed with the first liquid storage device (11), and then the first electric switching valve (5) is controlled to be communicated with the refrigeration branch circuit two, so that the compartment B (200) is refrigerated.
4. The method as claimed in claim 3, wherein the values of t3 and t4 are the same and are both between 30-300.
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| CN202011146257.XA CN112097411B (en) | 2020-10-23 | 2020-10-23 | Double-circulation refrigerating system of variable frequency refrigerator and control method thereof |
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| CN202011146257.XA CN112097411B (en) | 2020-10-23 | 2020-10-23 | Double-circulation refrigerating system of variable frequency refrigerator and control method thereof |
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| CN114719511B (en) * | 2021-01-04 | 2024-07-12 | 青岛海尔电冰箱有限公司 | Refrigerator and refrigerating system thereof |
| CN114719515B (en) * | 2021-01-04 | 2024-03-12 | 青岛海尔电冰箱有限公司 | Control method of refrigerator |
| CN112815559B (en) * | 2021-01-05 | 2023-04-11 | 中电建路桥集团有限公司 | Refrigerant cycle device and refrigerant cycle control method |
| CN113606806A (en) * | 2021-08-26 | 2021-11-05 | 中山市凯腾电器有限公司 | Double-temperature refrigeration system and operation control method thereof |
| CN113686084A (en) * | 2021-08-27 | 2021-11-23 | 广州万宝集团冰箱有限公司 | I-type double-circulation refrigeration control method for variable frequency refrigerator |
| CN113686083A (en) * | 2021-08-27 | 2021-11-23 | 广州万宝集团冰箱有限公司 | II-type double-circulation refrigeration control method for variable frequency refrigerator |
| CN115338024B (en) * | 2022-08-03 | 2023-04-07 | 重庆联庆瑞奇科技有限公司 | Low temperature tissue grinds appearance convenient to switch two kinds of refrigerants |
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| JP2002071254A (en) * | 2000-08-24 | 2002-03-08 | Toshiba Corp | Refrigerator and its controlling method |
| US7448226B2 (en) * | 2002-03-29 | 2008-11-11 | Kabushiki Kaisha Toshiba | Refrigerator |
| EP1376031B1 (en) * | 2002-06-26 | 2016-10-12 | LG Electronics, Inc. | Method for controlling operation of cooling system having two evaporators |
| CN1548867A (en) * | 2003-05-14 | 2004-11-24 | 河南新飞电器有限公司 | Independent control temperature multi-compartment cooling refrigerator |
| JP2005188783A (en) * | 2003-12-24 | 2005-07-14 | Toshiba Corp | Refrigerator |
| WO2008111149A1 (en) * | 2007-03-12 | 2008-09-18 | Hoshizaki Denki Kabushiki Kaisha | Cooling storage building |
| WO2008111162A1 (en) * | 2007-03-13 | 2008-09-18 | Hoshizaki Denki Kabushiki Kaisha | Cooling storage chamber and method for operating the same |
| KR20120044556A (en) * | 2010-10-28 | 2012-05-08 | 엘지전자 주식회사 | Refrigerator and control method thereof |
| CN107152809A (en) * | 2017-05-11 | 2017-09-12 | 合肥美的电冰箱有限公司 | Multi cycle refrigeration system and refrigerator |
| CN110579030B (en) * | 2019-09-27 | 2023-08-08 | 长虹美菱股份有限公司 | Refrigerating system of refrigerator and control method |
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