CN113048670A - Refrigerating system, defrosting control method and refrigerator - Google Patents

Refrigerating system, defrosting control method and refrigerator Download PDF

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Publication number
CN113048670A
CN113048670A CN202110303109.2A CN202110303109A CN113048670A CN 113048670 A CN113048670 A CN 113048670A CN 202110303109 A CN202110303109 A CN 202110303109A CN 113048670 A CN113048670 A CN 113048670A
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CN
China
Prior art keywords
evaporator
frost
heating
defrosting
shielding device
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Granted
Application number
CN202110303109.2A
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Chinese (zh)
Other versions
CN113048670B (en
Inventor
卢起彪
朱文琪
刘绍文
牛二帅
邓涵
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Priority to CN202110303109.2A priority Critical patent/CN113048670B/en
Publication of CN113048670A publication Critical patent/CN113048670A/en
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Publication of CN113048670B publication Critical patent/CN113048670B/en
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/004—Control mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • F25D21/008—Defroster control by timer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/065—Removing frost by mechanical means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/06—Removing frost
    • F25D21/08—Removing frost by electric heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/14—Collecting or removing condensed and defrost water; Drip trays
    • 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
    • F25D2600/02—Timing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2600/00—Control issues
    • F25D2600/06—Controlling according to a predetermined profile

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Defrosting Systems (AREA)

Abstract

The invention discloses a refrigeration system, a defrosting control method and a refrigerator. Wherein, this refrigerating system includes: the at least two parallel evaporators are arranged between the throttling device and the compressor, and after any one of the at least two parallel evaporators enters a defrosting mode, the evaporator adjacent to the evaporator enters a refrigerating mode; and each evaporator is correspondingly provided with a heater which is used for starting after the evaporator enters a defrosting mode to heat the surface of the evaporator. According to the invention, the frost on the surface of the evaporator entering the defrosting mode can be sublimated and fall off after becoming soft under the common influence of the temperature and humidity difference, so that the defrosting efficiency can be improved, and the energy consumption in the defrosting process can be reduced.

Description

Refrigerating system, defrosting control method and refrigerator
Technical Field
The invention relates to the technical field of refrigeration, in particular to a refrigeration system, a defrosting control method and a refrigerator.
Background
The refrigerating system of the refrigerator is divided into four parts, namely an evaporator, a condenser, a compressor and a throttling device. The evaporator is a device for providing cold energy, and the refrigerant absorbs heat in the evaporator and evaporates to reduce the air temperature. Since the evaporator temperature is lower than the air dew point temperature, moisture in the air is continuously condensed into frost on the evaporator. When the amount of frost increases, the heat transfer effect of the evaporator deteriorates, the refrigeration effect becomes poor, and the energy consumption increases.
At present, the refrigerator is generally an air-cooled refrigerator in the market and has the function of automatic defrosting. However, most air-cooled refrigerators adopt an electric heating defrosting mode, an electric heating pipe is arranged below an evaporator, and a frost layer is heated by heating air.
Because the defrosting mode heats the frost layer by means of natural convection of air and only controls a single evaporator, the defrosting efficiency is low, the defrosting operation is long in time consumption, and the power consumption is high.
Aiming at the problem that the defrosting efficiency of a refrigerating system in the prior art is low, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a refrigeration system, a defrosting control method and a refrigerator, and aims to solve the problem that the defrosting efficiency of the refrigeration system is low in the prior art.
In order to solve the above technical problem, the present invention provides a refrigeration system, wherein the refrigeration system comprises: compressor, condenser, the throttling arrangement that the end to end communicates in proper order still includes:
the at least two parallel evaporators are arranged between the throttling device and the compressor, and after any one of the at least two parallel evaporators enters a defrosting mode, the evaporator adjacent to the evaporator enters a refrigerating mode;
and each evaporator is correspondingly provided with a heater which is used for starting after the evaporator enters a defrosting mode to heat the surface of the evaporator.
Further, the refrigeration system further includes:
at least two vibration devices are correspondingly arranged on each evaporator and used for peeling off frost blocks on the surface of the evaporator through vibration.
Further, the refrigeration system further includes:
the frost receiving disc is arranged below the at least two parallel evaporators and is used for receiving frost blocks peeled off from the surfaces of the evaporators;
the heating net is arranged at the bottom of the frost receiving disc and used for heating frost blocks peeled off from the surface of the evaporator to convert the frost blocks into liquid water;
and the drain pipe is communicated with the bottom of the frost receiving disc and is used for draining the liquid water.
Furthermore, the frost receiving plate is funnel-shaped, a large opening of the frost receiving plate is positioned at one side close to the at least two parallel evaporators, and a small opening of the frost receiving plate is positioned at one side far away from the at least two parallel evaporators.
Further, the refrigeration system further includes:
the shielding device is positioned between the at least two parallel evaporators and the frost receiving plate; when the frost block is peeled off from the evaporator, the shielding device is opened under the impact of the frost block, so that the frost block falls on the heating net; when no frost block peels off from the evaporator, the shielding device keeps a closed state, a heating cavity is formed between the shielding device and the frost receiving disc, and the heating net is located in the heating cavity.
Further, the shielding apparatus includes:
the baffle plate comprises a first baffle plate and a second baffle plate, wherein the first baffle plate and the second baffle plate form a preset angle;
and a rotating shaft which is overlapped with the boundary line of the first baffle and the second baffle, and when the frost block is peeled off from the evaporator, the first baffle and the second baffle rotate around the rotating shaft, so that the shielding device is opened.
Further, the refrigeration system further includes:
the at least two first temperature sensors are correspondingly arranged on each evaporator and used for detecting the surface temperature of the evaporator after the evaporator enters a defrosting mode;
and the second temperature sensor is arranged in a heating cavity formed between the shielding device and the frost receiving disc and used for detecting the temperature of the heating cavity.
Further, the refrigeration system further includes:
the first timer is connected with the switch of the heater and is used for measuring the starting time of the heater;
the second timer is connected with the shielding device and used for measuring the closing time of the shielding device;
and the third timer is connected with the switch of the heating network and used for metering the starting time of the heating network.
Further, the vibration device is specifically configured to: the heating device is started when the heater is started and the surface temperature of the evaporator is higher than a first preset temperature, and/or the starting time of the heating device is longer than a first preset time;
the heating net is specifically used for: when the evaporator enters a defrosting mode and the closing time of the shielding device is longer than a second preset time, the evaporator is started; the temperature of a heating cavity formed between the shielding device and the frost collecting disc is higher than a second preset temperature, and/or the starting duration of the heating net is longer than a third preset duration and is closed.
Further, the refrigeration system further includes:
and the water receiving tray is arranged below the drain pipe and is used for containing liquid water discharged by the drain pipe.
The invention also provides a refrigerator comprising the refrigerating system.
The invention also provides a defrosting control method, which is applied to the refrigerating system and comprises the following steps:
after the evaporator enters a refrigeration mode, judging whether a defrosting condition is met or not according to the running state of the evaporator;
and after the defrosting condition is judged to be met, controlling the evaporators to enter a defrosting mode, controlling the corresponding heating devices to be started, and simultaneously controlling the adjacent evaporators to enter a refrigerating mode.
Further, after controlling the corresponding heating device to be turned on, the method further comprises:
and after the first preset condition is met, controlling a vibration device corresponding to the evaporator entering the defrosting mode to be started.
Further, the first preset condition is that: the temperature of the evaporator surface entering the defrost mode is greater than a first preset temperature and/or the duration of time the heating device is on is greater than a first preset duration.
Further, after controlling the vibration device corresponding to the evaporator entering the defrosting mode to be started, the method further comprises the following steps:
detecting the opening and closing state of the shielding device; wherein the shielding device is positioned between the at least two parallel evaporators and the frost receiving plate;
judging whether the shielding device keeps a closed state and lasts for a second preset time length;
if yes, controlling the heating device and the vibrating device to be closed, and simultaneously controlling a heating net at the bottom of the frost receiving disc to be opened; wherein, the frost receiving plate is arranged below the at least two parallel evaporators.
Further, after the heating net for controlling the bottom of the defrosting pan is turned on, the method further comprises the following steps:
judging whether the temperature of a heating cavity formed between the shielding device and the frost receiving disc and the starting time of the heating net meet a second preset condition or not;
if yes, controlling the heating net to be closed;
and if not, controlling the heating net to be kept opened.
Further, the second preset condition is that:
the temperature of the heating cavity formed between the shielding device and the frost collecting disc is higher than a second preset temperature, and/or the starting time of the heating net is longer than a third preset time.
The present invention also provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described defrost control method.
By applying the technical scheme of the invention, at least two evaporators connected in parallel are arranged, after any evaporator enters a defrosting mode, the evaporator adjacent to the evaporator enters a refrigerating mode, so that a humidity difference is generated between the evaporator entering the defrosting mode and the evaporator entering the refrigerating mode, meanwhile, a heater is correspondingly arranged on each evaporator, and after one evaporator enters the defrosting mode, the corresponding heater is started to heat the surface of the evaporator. Through the common influence of temperature and humidity difference, the frost block on the surface of the evaporator entering the defrosting mode is sublimated and falls off after becoming soft, thereby being beneficial to improving the defrosting efficiency and reducing the energy consumption in the defrosting process.
Drawings
FIG. 1 is a block diagram of a refrigeration system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a portion of a refrigeration system according to an embodiment of the present invention;
FIG. 3 is a schematic view of a shielding device according to an embodiment of the present invention in an open state;
FIG. 4 is a flow chart of a defrost control method according to an embodiment of the present invention;
FIG. 5 is a flow chart of a defrost control method according to another embodiment of the present invention;
fig. 6 is a flowchart of a defrost control method according to yet another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, 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 terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe the preset conditions in the embodiments of the present invention, the preset conditions should not be limited to these terms. These terms are only used to distinguish preset conditions. For example, the first preset condition may also be referred to as a second preset condition, and similarly, the second preset condition may also be referred to as a first preset condition without departing from the scope of the embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
The present embodiment provides a refrigeration system, and fig. 1 is a structural diagram of a refrigeration system according to an embodiment of the present invention, and as shown in fig. 1, the refrigeration system includes a compressor 1, a condenser 2, a throttling device 3, a first evaporator 4 and a second evaporator 5 arranged in parallel, and a three-way valve 6. The three-way valve 6 comprises a first port A1, a second port B1 and a third port C1, wherein the first port A1 is communicated with the throttling device 3, the second port B1 is communicated with the first evaporator 4, and the third port C1 is connected with the second evaporator 5. In specific implementation, the first evaporator 4 and the second evaporator 5 are arranged in an evaporation chamber, when the first port a1 and the second port B1 of the electromagnetic three-way valve 6 are communicated, the first evaporator 4 refrigerates, and the second evaporator 5 does not refrigerate; when the first port a1 of the three-way solenoid valve is communicated with the third port C1, the second evaporator 5 cools and the first evaporator 4 does not cool.
A check valve 7 is arranged on a main line between the compressor 1 and the first evaporator 4 and the second evaporator 5 which are arranged in parallel, and is used for controlling the refrigerant to flow from the first evaporator 4 or the second evaporator 5 to the compressor 1, so that the unidirectional flow is ensured, and the refrigerant of the refrigeration operation evaporator is prevented from entering the defrosting operation evaporator.
When the compressor 1 is in operation, the refrigerant flows out of the throttling device 3 and enters the evaporator, and because the temperature of the evaporator is lower than the dew point temperature of air, water vapor in the air is condensed on the surface of the evaporator to form a frost layer. The frost layer is formed in the initial stage, so that the heat transfer area of the evaporator is increased, and the heat transfer is facilitated; because the frost has a low thermal conductivity, the heat transfer effect of the evaporator is seriously affected when the frost layer grows to a certain thickness. In order not to affect the heat transfer efficiency of the evaporator, the evaporator needs to be defrosted. In the defrosting process, firstly, the frost blocks need to be loosened, therefore, each evaporator is correspondingly provided with a heater, and after a certain evaporator enters a defrosting mode, the corresponding heater is started to heat the surface of the evaporator.
It should be noted that, for convenience, the present invention is described by taking the number of the evaporators connected in parallel as two only as an example, in other embodiments of the present invention, the number of the evaporators connected in parallel may be three, four or more, when the number of the evaporators connected in parallel is three, four or more, each evaporator may have two adjacent evaporators, and after a certain evaporator enters the defrosting mode, two evaporators adjacent to the certain evaporator may be controlled to enter the cooling mode.
The refrigeration system of the embodiment comprises at least two evaporators connected in parallel, after any evaporator enters a defrosting mode, the evaporator adjacent to the evaporator is controlled to enter a refrigeration mode, so that a humidity difference is generated between the evaporator entering the defrosting mode and the evaporator entering the refrigeration mode, meanwhile, a heater is correspondingly arranged on each evaporator, and after one evaporator enters the defrosting mode, the corresponding heater is started to heat the surface of the evaporator. Through the common influence of temperature and humidity difference, the frost block on the surface of the evaporator entering the defrosting mode is sublimated and falls off after becoming soft, thereby being beneficial to improving the defrosting efficiency and reducing the energy consumption in the defrosting process.
In the embodiment, the first evaporator 4 is provided with a first heater 8, which can heat the surface of the first evaporator 4; the second evaporator 5 is provided with a second heater 9 which can heat the surface of the second evaporator 5. The first evaporator 4 and the second evaporator 5 do not defrost at the same time, the second evaporator 5 refrigerates when the first evaporator 4 defrosts, and the first evaporator 4 refrigerates when the second evaporator 5 defrosts. The first heater 8 and the second heater 9 are low-power heaters, specifically, the first heater 8 is a resistance wire embedded in the surface of the first evaporator 4, and the second heater 9 is also a resistance wire embedded in the surface of the second evaporator 5. Because adjacent first evaporimeter 4 and second evaporimeter 5 are not the defrosting simultaneously, can produce the humidity difference between the evaporimeter that gets into the defrosting mode and the evaporimeter of operation refrigeration mode, the evaporimeter ambient humidity that gets into the defrosting mode is high, the evaporimeter ambient humidity that operates refrigeration mode is low, the evaporimeter surface frost layer that gets into the defrosting mode this moment can be under the common influence of temperature and humidity difference, sublime gradually, and then make the frost block become soft, easily drops. The energy consumed by the entire sublimation electrical heating process is not high, since the sublimated frost layer is only a small fraction compared to the condensed frost layer on the entire evaporator.
Example 2
In order to further accelerate the shedding of the frost blocks on the surfaces of the evaporators, as shown in fig. 2, a vibration device is correspondingly arranged on each evaporator and is used for starting after the corresponding heater is started, and the frost blocks on the surfaces of the evaporators are stripped through vibration. Specifically, the first vibration device 10 is correspondingly disposed on the first evaporator 4, and the second vibration device 11 is correspondingly disposed on the second evaporator 5. In particular, a first vibrating device 10 is located on the line of the first evaporator 4 and a second vibrating device 11 is located on the line of the second evaporator 5.
In order to avoid energy waste, all frost lumps peeled off from the surface of the evaporator need to be collected and heated intensively, and therefore, as shown in fig. 2, the refrigeration system further includes: the frost receiving disc 16 is arranged below the first evaporator 4 and the second evaporator 5 and is used for receiving frost blocks peeled off from the surface of the first evaporator 4 or the second evaporator 5; the heating net 12 is arranged at the bottom of the frost receiving disc 16 and is used for heating frost blocks peeled off from the surface of the first evaporator 4 or the second evaporator 5 to convert the frost blocks into liquid water; and a drain pipe 15 communicating with the bottom of the frost receiving pan 16 for draining the liquid water.
In order to ensure that the frost lumps peeled off from each evaporator can be collected and concentrated to a smaller area for heating, as shown in fig. 2, the frost receiving plate is funnel-shaped, and the large opening of the frost receiving plate is positioned at the side close to the first evaporator 4 and the second evaporator 5, and the small opening of the frost receiving plate is positioned at the side far from the first evaporator 4 and the second evaporator 5. Through the structure that the upper part is wide and the lower part is narrow, all frost blocks peeled off from all the evaporators can be collected and are concentrated in a small area at the bottom of the frosting disc due to the action of gravity, and heating is facilitated.
Because the heating action of the heating net 12 will cause the ambient air to be heated, the hot air flows into the evaporation cavity, and the refrigeration effect of the evaporator is affected, in order to solve the above problems, the above refrigeration system further includes: shielding devices positioned below the at least two evaporators connected in parallel and above the heating net 12; as shown in FIG. 2, when no frost block is peeled off from the evaporator, the shutter device is kept in a closed state, a heating cavity 18 is formed between the shutter device and the frost receiving plate 16, and the heating net 12 is positioned in the heating cavity 18.
FIG. 3 is a schematic view showing the shutter device in an open state according to the embodiment of the present invention, as shown in FIG. 3, when a frost cake peels off from the evaporator, the shutter device is opened by the hitting of the frost cake, and the frost cake falls onto the heating net 12;
specifically, the shielding device includes: a first baffle 13a and a second baffle 13b, the first baffle 13a and the second baffle 13b having a predetermined angle, wherein the predetermined angle is in the range of 70 ° to 120 °, preferably 90 °; the rotation shaft 14 is overlapped with the boundary line between the first shutter 13a and the second shutter 13b, and when a frost cake peels off from the evaporator, the first shutter 13a and the second shutter 13b rotate about the rotation shaft 14 to open the shutter device, and the frost cake falls into the frost receiving plate 16.
When the temperature of the surface of the defrosting evaporator reaches a preset value and/or the on time of the heater reaches a certain time, it can be determined that the frost layer on the surface of the evaporator becomes soft, and at this time, the vibrating device can be opened to peel the evaporator from the evaporator, so that the refrigerating system further comprises: at least two first temperature sensors 19 correspondingly arranged on each evaporator for detecting the surface temperature of the evaporator after the evaporator enters a defrosting mode; and the second temperature sensor 20 is arranged in the heating cavity 18 formed between the shielding device and the frost receiving disc 16 and used for detecting the temperature of the heating cavity 18. Further comprising: a first timer (not shown in the figure) connected to the switch of each heater for measuring the on-time of each heater; a second timer (not shown in the figure) connected to the shielding device for measuring the closing time of the shielding device, wherein the first baffle 13a, the second baffle 13b and the water receiving tray 16 can form an electric circuit, when the shielding device is closed, the electric circuit is conducted, when the shielding device is opened, the electric circuit is broken, so as to detect the opening and closing of the shielding device; and a third timer (not shown) connected to the switch of the heating network 12 for measuring the on-time of the heating network 12. Each vibration device is specifically configured to: the method comprises the following steps that the heater is started, the surface temperature of the corresponding evaporator is greater than a first preset temperature, and/or the starting time of the heating device is greater than a first preset time, wherein the first preset temperature ranges from minus 20 ℃ to minus 5 ℃, the temperature is preferably minus 10 ℃, and the temperature ranges from 10min to 20min, preferably 10 min; the heating net 12 is specifically used for: when the evaporator enters a defrosting mode and the closing time of the shielding device is longer than a second preset time, the evaporator is opened, wherein the value range of the second preset time is 3-5 min, and preferably 3 min; and closing the heating chamber 18 formed between the shielding device and the frost collecting disc 16 when the temperature is higher than a second preset temperature and/or the opening time of the heating net 12 is longer than a third preset time, wherein the second preset temperature is 0-10 ℃, preferably 5 ℃, and the third preset time is 3-5 min, preferably 5 min.
In order to prevent the liquid water discharged from the water discharge pipe from flowing everywhere, the refrigeration system further comprises: and the water receiving tray 17 is arranged below the drain pipe 15 and is used for containing liquid water discharged by the drain pipe 15.
In summary, after entering the defrosting mode, the working process of the refrigeration system of this embodiment specifically is: when the starting time of the heater corresponding to the evaporator entering the defrosting mode reaches a first preset time or the temperature of the evaporator entering the defrosting mode reaches a first preset temperature, the frost block on the surface of the evaporator becomes soft, and at the moment, the corresponding vibration device can be started to peel the frost block from the evaporator. An openable and closable shielding device is arranged between the evaporator and the frost receiving disc 16, the shielding device is closed in a cooling mode, and in a defrosting mode, a frost block falling off from the evaporator slides down from the frost receiving disc 16 to impact a baffle 13a or a baffle 13b in the shielding device to rotate a certain angle, so that the heating cavity 18 is opened, and the shielding device is changed into a closed state again under the action of gravity balance after the frost block falls into the frost receiving disc 16; when the shutter is closed, hot air from the heating chamber 18 is prevented from entering the evaporation chamber, resulting in a waste of energy. The heating net 12 is arranged in the heating cavity 18 below the shielding device, large frost blocks can be melted into liquid water, the liquid water flows into the drain pipe 15 from meshes on the heating net 12 and flows into the water receiving tray 17 through the drain pipe 15, the drain pipe 15 is prevented from being blocked and frozen by the frost blocks, and the heating net 12 adopts a contact type heating mode, so that heat loss is small.
Example 3
The present embodiment provides a defrosting control method applied to the refrigeration system in the above embodiment, and fig. 4 is a flowchart of the defrosting control method according to the embodiment of the present invention, as shown in fig. 4, the method includes:
and S101, after the evaporator enters a refrigeration mode, judging whether a defrosting condition is met according to the running state of the evaporator.
Because the surface of the evaporator is frosted more, the resistance can be caused to air convection, and the air speed of the air outlet of the evaporator is reduced, so that the air speed of the air outlet can be detected during specific implementation, and whether the defrosting condition is met or not is judged according to the air speed of the air outlet. Specifically, when the air speed of the air outlet is smaller than the preset air speed, it is indicated that the surface of the evaporator is frosted more, and the defrosting condition is determined to be met, otherwise, it is indicated that the surface of the evaporator is frosted less, and the defrosting condition is determined not to be met. In practical application, a person skilled in the art can set a proper preset air speed according to an experimental test.
And S102, after the defrosting condition is judged to be met, controlling the evaporators to enter a defrosting mode, controlling the corresponding heating devices to be started, and simultaneously controlling the adjacent evaporators to enter a refrigerating mode.
According to the defrosting control method, after the evaporator enters the refrigeration mode, the running state of the evaporator is detected, whether the defrosting condition is met or not is judged according to the running state of the evaporator, after the evaporator is judged to meet the defrosting condition, the evaporator is controlled to enter the defrosting mode, the corresponding heating device is controlled to be started, meanwhile, the adjacent evaporators are controlled to enter the refrigeration mode, and through the common influence of the temperature and humidity difference, frost blocks on the surface of the evaporator entering the defrosting mode are sublimated and fall off after becoming soft, so that the defrosting efficiency is improved, and the energy consumption in the defrosting process is reduced.
Fig. 5 is a flowchart of a defrost control method according to another embodiment of the present invention, as shown in fig. 5, the method including:
s1, detecting the operation condition of the refrigeration evaporator.
Because the surface of the evaporator is frosted more, the resistance can be caused to air convection, and the air speed of the air outlet of the evaporator is reduced, therefore, the air speed of the air outlet can be detected during specific implementation, and whether the defrosting operation condition is met or not is judged according to the air speed of the air outlet.
S2, judging whether defrosting operation conditions are met; if so, step S3 is executed, if not, the process returns to step S1.
And when the air speed of the air outlet is less than the preset air speed, indicating that the surface of the evaporator is frosted more, judging that the defrosting condition is met, otherwise, indicating that the surface of the evaporator is frosted less, judging that the defrosting condition is not met, and continuously detecting the running condition of the refrigeration evaporator.
And S3, controlling the current refrigeration evaporator to be switched to the defrosting evaporator.
And S4, controlling the evaporator adjacent to the defrosting evaporator to be switched into a refrigerating evaporator.
Example 4
In the embodiment, another defrosting control method is provided, and the heat transfer area of the evaporator is increased at the early stage of frost layer formation, so that heat transfer is facilitated; because the thermal conductivity of the frost is very small, when the frost layer develops to a certain thickness, the heat transfer effect of the evaporator is seriously affected, according to the embodiment, under the common influence of the temperature and the humidity difference, the frost block is partially sublimated, so that the frost block becomes soft and is easy to fall off, and in order to further accelerate the falling off of the frost block on the surface of the evaporator, after the corresponding heating device is controlled to be started, the method further comprises the following steps: and after the first preset condition is met, controlling a vibration device corresponding to the evaporator entering the defrosting mode to be started. Wherein the first preset condition is as follows: the temperature of the evaporator surface entering the defrost mode is greater than a first preset temperature and/or the heating device is turned on for a period of time greater than a first preset period of time. Through setting up first preset condition, guarantee that the frost cake sublimes and becomes the soft back, just open vibrating device.
After the control enters into the corresponding vibrating device of evaporimeter of defrosting mode and opens, the frost cake on evaporimeter surface can drop on first baffle or second baffle, strikes first baffle or second baffle and rotates around the axis of rotation, and then falls into the heating intracavity, in order to avoid the energy waste, need all collect the concentrated heating of back with the frost cake that the evaporimeter surface peeled off, consequently, after the control enters into the corresponding vibrating device of evaporimeter of defrosting mode and opens, above-mentioned method still includes:
detecting the opening and closing state of the shielding device; the shielding device is positioned between the at least two parallel evaporators and the frost receiving plate; judging whether the shielding device keeps a closed state and lasts for a second preset time length; if yes, indicating that all frost blocks peeled off from the surface of the evaporator are well collected, controlling the heating device and the vibrating device to be closed, and simultaneously controlling the heating net at the bottom of the frost receiving disc to be opened; wherein, connect the frost dish to set up in the below of at least two parallelly connected evaporimeters.
After the heating net is controlled to be opened for a period of time, all the frost blocks are melted into water, the heating net does not need to be opened again, in order to accurately control the closing time of the heating net and save energy, after the heating net is controlled to be opened, the method further comprises the following steps: judging whether the temperature of a heating cavity formed between the shielding device and the frost receiving disc and the opening duration of the heating net meet a second preset condition or not; if yes, controlling the heating net to be closed; if not, the heating net is controlled to be kept opened. Wherein the second preset condition is as follows: the temperature of a heating cavity formed between the shielding device and the frost receiving disc is larger than a second preset temperature, and/or the starting time of the heating net is larger than a third preset time.
The defrosting control method according to the present invention is described below with reference to an embodiment, and fig. 6 is a flowchart of a defrosting control method according to another embodiment of the present invention, as shown in fig. 6, the method includes:
s11, controlling the first evaporator to refrigerate and the second evaporator not to refrigerate;
and S12, detecting the wind speed v1 of the fan outlet of the first evaporator.
S13, judging whether the wind speed v1 of the fan outlet of the first evaporator is smaller than a preset wind speed v 0; if so, step S14 is executed, if not, the process returns to step S12.
And S14, controlling the first evaporator to enter a defrosting mode and controlling the second evaporator to enter a cooling mode.
Controlling the first evaporator to enter the defrost mode specifically includes: the three-way valve is controlled to change the flow from the first port A1 to the second port B1 to the first port A1 to the third port C1, the first heater is started, and the first timer is controlled to start timing. At the moment, the first evaporator enters a defrosting mode, the temperature is slightly increased, and the humidity of the ambient air is high; the second evaporator enters a refrigerating state, the humidity of the surrounding air is low, a humidity difference is formed between the first evaporator and the second evaporator, the condition of frost layer sublimation (latent heat and humidity difference) is met, and the frost layer on the first evaporator is gradually sublimated.
S15, the temperature of the first evaporator surface T1 and the on-time period T1 of the first heater are detected.
S16, judging whether at least one of the temperature T1 of the surface of the first evaporator is greater than a first preset temperature T01 or the starting time period T1 of the first heater is greater than a first preset time period T01 is true; if so, step S17 is executed, if not, the process returns to step S15.
And S17, controlling the first vibration device to be started.
When the temperature of the first evaporator rises to a first preset temperature t0, the frost layer on the surface of the first evaporator is sublimated and gradually becomes soft, and at the moment, the first vibration device can be correspondingly started; if the first evaporator temperature does not reach T0, but the starting time period T1 of the first heater is longer than the first preset time period T01, the first vibration device can also be started; and vibrating and peeling off the frost layer on the surface of the first evaporator.
The frost block peeled off from the first evaporator can impact the first baffle when sliding down from the frost receiving plate, so that the first baffle and the second baffle rotate around the rotating shaft, and the first baffle and the second baffle are restored to a closed state due to the gravity balance action after the frost block falls down.
S18, the open/close state of the first shutter and the second shutter is detected.
And S19, judging whether the first baffle and the second baffle keep the closed state and continue for a second preset time length Delta T02, if so, executing the step S110, otherwise, returning to the step S18.
S110, the first heater and the first vibration device are closed, and the heating net is opened at the same time.
The second predetermined period Δ T02 is determined experimentally to indicate that all of the frost on the surface of the first evaporator has been shed when the first and second shutters remain closed for the second predetermined period Δ T02. The first baffle, the second baffle and the water pan can form a closed loop, and when the frost block slides off the water pan to open the baffles, the closed loop is disconnected, timing is started, and counting is carried out; when the next loop is disconnected, timing again and counting; if no circuit disconnection is detected in Δ T02, that is, if no opening of the shutter is detected, it is considered that the frost cake has been peeled off, and the first heater and the first vibration device are turned off.
S111, detecting the heating cavity temperature T2 and the opening time length T3 of the heating net.
S112, judging whether at least one of the heating cavity temperature T2 and the heating network opening time length T3 is greater than a second preset temperature T02 or a third preset time length T03 is true, if so, executing the step S113, and if not, returning to the step S111.
And S113, judging that the defrosting treatment is finished, closing the heating net and exiting the defrosting mode.
Example 5
The embodiment provides a refrigerator, which comprises the refrigeration system in the embodiment, and is used for improving defrosting efficiency and reducing energy consumed in a defrosting process.
Example 6
The present embodiment provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the above-described defrost control method.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (18)

1. A refrigeration system, comprising: compressor, condenser, the throttling arrangement that the end to end communicates in proper order still includes:
the at least two parallel evaporators are arranged between the throttling device and the compressor, and after any one of the at least two parallel evaporators enters a defrosting mode, the evaporator adjacent to the evaporator enters a refrigerating mode;
and each evaporator is correspondingly provided with a heater which is used for starting after the evaporator enters a defrosting mode to heat the surface of the evaporator.
2. The refrigeration system of claim 1, further comprising:
at least two vibration devices are correspondingly arranged on each evaporator and used for peeling off frost blocks on the surface of the evaporator through vibration.
3. The refrigeration system of claim 1, further comprising:
the frost receiving disc is arranged below the at least two parallel evaporators and is used for receiving frost blocks peeled off from the surfaces of the evaporators;
the heating net is arranged at the bottom of the frost receiving disc and used for heating frost blocks peeled off from the surface of the evaporator to convert the frost blocks into liquid water;
and the drain pipe is communicated with the bottom of the frost receiving disc and is used for draining the liquid water.
4. The refrigeration system of claim 3, wherein the frost receiving plate is funnel-shaped, with a large opening located on a side near the at least two parallel evaporators and a small opening located on a side away from the at least two parallel evaporators.
5. The refrigeration system of claim 4, further comprising:
the shielding device is positioned between the at least two parallel evaporators and the frost receiving plate; when the frost block is peeled off from the evaporator, the shielding device is opened under the impact of the frost block, so that the frost block falls on the heating net; when no frost block peels off from the evaporator, the shielding device keeps a closed state, a heating cavity is formed between the shielding device and the frost receiving disc, and the heating net is located in the heating cavity.
6. The refrigeration system of claim 5, wherein the shielding device comprises:
the baffle plate comprises a first baffle plate and a second baffle plate, wherein the first baffle plate and the second baffle plate form a preset angle;
and a rotating shaft which is overlapped with the boundary line of the first baffle and the second baffle, and when the frost block is peeled off from the evaporator, the first baffle and the second baffle rotate around the rotating shaft, so that the shielding device is opened.
7. The refrigeration system of claim 5, further comprising:
the at least two first temperature sensors are correspondingly arranged on each evaporator and used for detecting the surface temperature of the evaporator after the evaporator enters a defrosting mode;
and the second temperature sensor is arranged in a heating cavity formed between the shielding device and the frost receiving disc and used for detecting the temperature of the heating cavity.
8. The refrigeration system of claim 5, further comprising:
the first timer is connected with the switch of the heater and is used for measuring the starting time of the heater;
the second timer is connected with the shielding device and used for measuring the closing time of the shielding device;
and the third timer is connected with the switch of the heating network and used for metering the starting time of the heating network.
9. The refrigeration system of claim 7 or 8,
the vibration device is specifically configured to: the heating device is started when the heater is started and the surface temperature of the evaporator is higher than a first preset temperature, and/or the starting time of the heating device is longer than a first preset time;
the heating net is specifically used for: when the evaporator enters a defrosting mode and the closing time of the shielding device is longer than a second preset time, the evaporator is started; the temperature of a heating cavity formed between the shielding device and the frost collecting disc is higher than a second preset temperature, and/or the starting duration of the heating net is longer than a third preset duration and is closed.
10. The refrigeration system of claim 3, further comprising:
and the water receiving tray is arranged below the drain pipe and is used for containing liquid water discharged by the drain pipe.
11. A refrigerator characterized by comprising the refrigeration system of any one of claims 1 to 10.
12. A defrosting control method applied to the refrigeration system according to any one of claims 1 to 10, characterized by comprising:
after the evaporator enters a refrigeration mode, judging whether a defrosting condition is met or not according to the running state of the evaporator;
and after the defrosting condition is judged to be met, controlling the evaporators to enter a defrosting mode, controlling the corresponding heating devices to be started, and simultaneously controlling the adjacent evaporators to enter a refrigerating mode.
13. The method of claim 12, wherein after controlling the respective heating device to be turned on, the method further comprises:
and after the first preset condition is met, controlling a vibration device corresponding to the evaporator entering the defrosting mode to be started.
14. The method according to claim 13, wherein the first preset condition is: the temperature of the evaporator surface entering the defrost mode is greater than a first preset temperature and/or the duration of time the heating device is on is greater than a first preset duration.
15. The method of claim 13, wherein after controlling the vibration device corresponding to the evaporator entering the defrost mode to be turned on, the method further comprises:
detecting the opening and closing state of the shielding device; wherein the shielding device is positioned between the at least two parallel evaporators and the frost receiving plate;
judging whether the shielding device keeps a closed state and lasts for a second preset time length;
if yes, controlling the heating device and the vibrating device to be closed, and simultaneously controlling a heating net at the bottom of the frost receiving disc to be opened; wherein, the frost receiving plate is arranged below the at least two parallel evaporators.
16. The method of claim 15, wherein after controlling the heating screen of the bottom of the frost receiving pan to be turned on, the method further comprises:
judging whether the temperature of a heating cavity formed between the shielding device and the frost receiving disc and the starting time of the heating net meet a second preset condition or not;
if yes, controlling the heating net to be closed;
and if not, controlling the heating net to be kept opened.
17. The method according to claim 16, wherein the second preset condition is:
the temperature of the heating cavity formed between the shielding device and the frost collecting disc is higher than a second preset temperature, and/or the starting time of the heating net is longer than a third preset time.
18. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 12 to 17.
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