CN113899141B - Module for defrosting in advance, control method thereof and refrigeration equipment - Google Patents

Module for defrosting in advance, control method thereof and refrigeration equipment Download PDF

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Publication number
CN113899141B
CN113899141B CN202111164120.1A CN202111164120A CN113899141B CN 113899141 B CN113899141 B CN 113899141B CN 202111164120 A CN202111164120 A CN 202111164120A CN 113899141 B CN113899141 B CN 113899141B
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China
Prior art keywords
defrosting
moisture absorption
frost
electromagnetic valve
early
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CN202111164120.1A
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Chinese (zh)
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CN113899141A (en
Inventor
王铭坤
廖虎
冯云凌
文翔
刘洋
李江伟
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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 CN202111164120.1A priority Critical patent/CN113899141B/en
Publication of CN113899141A publication Critical patent/CN113899141A/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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/042—Air treating means within refrigerated spaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • 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
    • F25D21/14—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
    • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
    • F25D2317/04—Treating air flowing to refrigeration compartments
    • F25D2317/041—Treating air flowing to refrigeration compartments by purification
    • F25D2317/0411—Treating air flowing to refrigeration compartments by purification by dehumidification
    • 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

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

Abstract

The invention discloses a module for defrosting in advance, a control method thereof and refrigeration equipment. Wherein the module of defrosting in advance includes: a cooling device arranged in a refrigerating return air duct between a return air inlet of the refrigerating chamber and an evaporator of the freezing chamber, and used for condensing moisture into frost before reaching the evaporator of the freezing chamber; and a defrosting device which defrosts the cooling device when the cooling device is frosted. The invention enables the wet air to frost in advance before reaching the evaporator of the freezing chamber, can prolong the defrosting time interval of the evaporator of the freezing chamber, and reduce the air humidity in the refrigeration equipment, so that the frost layer of the evaporator in the freezing chamber is thinner, the defrosting time is changed, and the temperature fluctuation of the freezing chamber is smaller.

Description

Module for defrosting in advance, control method thereof and refrigeration equipment
Technical Field
The invention relates to the technical field of defrosting, in particular to a module for defrosting in advance and a control method thereof, which are used for ensuring the relative stability of the temperature in a freezing chamber.
Background
At present, the refrigeration effect can be influenced after an evaporator of a freezing chamber of a mainstream air-cooled refrigerator frosts, if the defrosting time is long when a frost layer is too thick, the temperature of the freezing chamber can obviously rise during defrosting, the temperature exceeds 3 ℃, the temperature can seriously rise by more than 10 ℃, the refrigeration temperature fluctuation of the refrigerator is large, and the storage of food materials is influenced.
Generally, after air is exhausted from an air inlet of a refrigerating chamber, the air passes through a refrigerating air return inlet and an air return channel and then reaches an evaporator in a freezing chamber to be cooled, and then the air is sent to the refrigerating chamber through the air inlet of the refrigerating chamber.
Some methods in the prior art place the drier in the return air inlet of the refrigerating chamber or the return air duct to absorb moisture to avoid moisture entering the freezing chamber, but this method needs to change the drier frequently, and is more tedious, and should change and difficult to judge when, and the effect of avoiding the refrigerator temperature fluctuation because of defrosting is limited.
Disclosure of Invention
In order to solve the technical problem of temperature fluctuation caused by defrosting of a freezing chamber in the prior art, the invention provides a module for defrosting in advance, a control method thereof and refrigeration equipment.
The invention provides a module for defrosting in advance, which comprises:
a cooling device arranged in a refrigerating return air duct between a return air inlet of the refrigerating chamber and an evaporator of the freezing chamber, and used for condensing moisture into frost before reaching the evaporator of the freezing chamber;
and a defrosting device that defrosts the cooling device when the cooling device is frosted.
Furthermore, the cooling device extends into the return air duct of the refrigerating chamber through a part of coil pipes of the return air pipe assembly of the compressor to form the cooling device.
Further, the defrosting apparatus includes: the defrosting assembly is driven to move back and forth, the control assembly is controlled by the driving assembly, and the drainage assembly is used for draining frost scraped by the defrosting assembly.
Further, the frost scraping assembly is a sleeve, the sleeve is sleeved on a coil pipe located in an air return duct of the refrigerating chamber, and a gap between the inner wall of the sleeve and the outer wall of the coil pipe is smaller than a preset distance.
Further, the driving assembly comprises an electromagnetic valve for driving the frost scraping assembly to move along a first direction, and an elastic piece capable of enabling the frost scraping assembly to move along a second direction opposite to the first direction.
Further, the driving assembly further comprises a moisture absorption expansion contact unit connected with the electromagnetic valve in series, the moisture absorption expansion contact unit comprises two contacts arranged at intervals, and a moisture absorption expansion block for controlling one contact to be connected with or separated from the other contact according to the humidity.
Further, the hygroscopic expansion contact unit further comprises a heater arranged in the hygroscopic expansion block.
Furthermore, the drainage assembly comprises a groove arranged in the air return channel of the refrigerating chamber and positioned below the coil pipe, and a drainage pipe and a water receiving disc which are connected with the groove.
Furthermore, the groove is parallel to the coil pipe in the air return duct of the refrigerating chamber and faces the water inlet of the drain pipe.
Furthermore, frosting grains are arranged on the outer wall of the coil pipe positioned in the air return duct of the refrigerating chamber.
The refrigeration equipment provided by the invention adopts the module for defrosting in advance according to the technical scheme.
Further, the refrigeration apparatus includes a refrigerator.
The invention discloses a control method of a module for defrosting in advance, which comprises an expansion valve and a moisture absorption expansion contact unit, and comprises the following steps:
when the humidity of the refrigerating chamber is larger than the preset humidity and/or the air door of the refrigerating chamber is opened, the power supply of the electromagnetic valve is switched on at least once until the preset time, and if the two contacts of the moisture absorption expansion contact unit are connected with each other, the electromagnetic valve is switched on to drive the sleeve to move towards the first direction.
Further, the method also comprises the following steps: and monitoring the duration of the opening of the air door of the refrigerating chamber, and controlling the turn-on times of the power supply of the electromagnetic valve according to the duration.
Further, still include: when the electromagnetic valve is conducted, the heater in the moisture absorption expansion block of the moisture absorption expansion contact unit is electrified; when moisture in the moisture absorption expansion block is evaporated, the two contacts of the moisture absorption expansion contact unit are separated from each other, the electromagnetic valve is switched off, and the sleeve is driven by the elastic element to move towards a second direction opposite to the first direction.
The invention arranges a part of coil pipes of the air return pipe assembly coiled in the foaming layer into the air return channel, sleeves capable of reciprocating are sleeved on the coil pipes in the air return channel, a spring is used as a reset device, and an electromagnetic valve is used as a power source to enable the sleeves to reciprocate back and forth. The utility model discloses a frosting before the coil pipe that has utilized freezing temperature to make humid air get into the freezer carries forward frosting, intelligent control sleeve pipe reciprocating motion, utilize the fit clearance between sleeve pipe and the coil pipe little to scrape the layer of frosting down, directly arrange away through the drain pipe, reduce the air moisture content in the refrigerator, avoided because deposit vegetables etc. in the freezer and lead to the evaporimeter in the freezer to easily frosting influence the problem of performance, this scheme can defrost in advance in the return air duct, reduce the frosting volume of evaporimeter in the freezer, need not repeated defrosting, improve the refrigerator constant temperature. In addition, the invention also utilizes the electromagnetic valve to cooperate with the moisture absorption expansion contact unit to intelligently control defrosting, thereby avoiding the problems of defrosting in the absence of frost and defrosting after frost is too thick. The invention can increase the defrosting time interval of the evaporator of the freezing chamber without influencing the refrigeration performance, and the defrosting time is shortened and the temperature fluctuation of the freezing chamber is reduced because the frost layer is thinner during defrosting.
Drawings
The invention is described in detail below with reference to embodiments and the attached drawings, wherein:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of the present invention.
Fig. 3 is a contact schematic view of the hygroscopic expansion contact unit of the present invention.
Fig. 4 is a schematic view of the contact separation of the hygroscopic expansion contact unit of the present invention.
Fig. 5 is a flow chart of a control method of the present invention.
Fig. 6 is a schematic overall structure diagram of an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Thus, a feature indicated in this specification will serve to explain one of the features of one embodiment of the invention, and does not imply that every embodiment of the invention must have the stated feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
The module for defrosting in advance mainly comprises a cooling device and a defrosting device, wherein the cooling device is arranged in a refrigerating return air duct between a return air inlet of a refrigerating chamber and an evaporator of a freezing chamber, and is used for condensing moisture into frost before reaching the evaporator of the freezing chamber, so that the frosting amount of the evaporator of the freezing chamber is reduced, or the frosting condition of the evaporator of the freezing chamber is delayed, and the probability of overlarge temperature fluctuation of the freezing chamber caused by defrosting is reduced. The defrosting device is used for defrosting the cooling device when the cooling device frosts.
In a preferred embodiment, the cooling device is arranged in the return duct of the refrigerating compartment. The cooling device extends into the return air duct of the refrigerating chamber through a part of coil pipes of the return air pipe assembly of the compressor to form. The invention moves a part of the coil pipe of the air return pipe assembly to place in the return air duct of the refrigerating chamber, as shown in figure 1, the refrigerant pipeline will usually come out from the condenser outlet pipe of the bottom, connect the air return pipe assembly, the air return pipe assembly connects the refrigerating chamber again, different from the prior art, the coil pipe 1 of the air return pipe assembly of the invention has a part to place in the return air duct 2 of the refrigerating chamber, the dotted line is the return air duct of the refrigerating chamber. In a preferred embodiment, the air return pipe assembly can be a copper pipe with frosted lines on the surface, for example, the outer wall of the coil pipe in the air return channel of the refrigerating chamber is provided with frosted lines, so that the heat exchange effect can be increased, the frost layer is easier to condense, and the effect of defrosting in advance is better. In other embodiments, the evaporator can be arranged in the refrigerating chamber as a cooling device for defrosting in advance, and the coil can be arranged in the return air duct of the refrigerating chamber as another cooling device for defrosting in advance.
The defrosting device comprises a defrosting assembly, a driving assembly, a control assembly and a drainage assembly.
The defrosting assembly defrosts the cooling device. In a specific embodiment, the frost scraping component adopts a sleeve 3, the sleeve 3 is sleeved on the coil 1 in the air return duct 2, and a gap between the inner wall of the sleeve 3 and the outer wall of the coil 1 is smaller than a preset distance. For example, if the coil pipe has an outer diameter of 2.5mm, the sleeve 3 can be designed to have an inner diameter of 2.7mm and a unilateral gap of 0.1mm, even in a range of 0.01-1 mm, so that the sleeve 3 can move back and forth to effectively scrape frost.
The driving assembly can drive the frost scraping assembly to move back and forth. In a particular embodiment, the drive assembly comprises a solenoid valve 4 and a resilient member. The electromagnetic valve 4 drives the frost scraping assembly to move along a first direction, and the elastic piece can enable the frost scraping assembly to move along a second direction opposite to the first direction. The elastic part adopts a spring 5 which supports one end of the sleeve, the electromagnetic valve 4 is arranged at the other end of the spring 5, the spring 5 pushes the end part of the sleeve 3 to the direction away from the electromagnetic valve 4 in the natural extension state, and after the electromagnetic valve 4 is switched on, suction force is generated to attract the sleeve 3 to move towards the electromagnetic valve 4. If the length of the part of the coil pipe 1 located in the air return channel is long, the end part of the sleeve pipe is far away from the electromagnetic valve, a plurality of electromagnetic valves can be further arranged, the sleeve pipe is attracted section by section to scrape frost, and the electromagnetic valve located on the left side in the figure 2 is responsible for the suction of the first section of the route to scrape frost. When the solenoid is de-energized, the suction force disappears and the spring will again support the sleeve back to its original position.
In a preferred embodiment, as shown in fig. 2, the driving assembly further comprises a hydroscopic expansion contact unit 6 connected in series with the solenoid valve, the hydroscopic expansion contact unit comprising two contacts 61 arranged at intervals, and a hydroscopic expansion block 62 for controlling one of the contacts to be connected with or separated from the other contact according to the magnitude of humidity. As shown in fig. 3, when the moisture is large, the frosting probability of the cooling device is high, the moisture absorption expansion block 62 absorbs enough moisture, and then starts to expand, and pushes the contact 61 connected with the moisture absorption expansion block towards the other contact 61 until the two are connected, at this time, the electromagnetic valve is conducted, and the sleeve starts to scrape the frost. When moisture is removed, the moisture content of the hygroscopic expansion block 62 is reduced, and the contact 61 connected with the hygroscopic expansion block is driven to move away from the other contact 61, the electromagnetic valve is disconnected, and the sleeve returns to the original position under the action of the spring to scrape frost again, as shown in fig. 4. The invention realizes intelligent frost scraping action through the moisture absorption expansion contact unit, the left end in the figure is a moisture absorption expansion block with a built-in moisture absorption material, and the inside of the moisture absorption expansion block is provided with a recoverable moisture absorption material such as fluffy cellulose or water absorption resin, and the like, and the moisture absorption expansion block can expand to a certain degree after moisture absorption to push the contact connected with the moisture absorption expansion block to move rightwards and contact with the other contact, so that the electromagnetic valve circuit is communicated. The suction effect after the solenoid valve is electrified attracts the sleeve pipe to scrape frost, and the suction disappears after the power failure, and the sleeve pipe restores to the original position.
The inside of the moisture absorption expansion block can be provided with a heater, after the sleeve starts to scrape frost, the heater in the moisture absorption expansion block is started to evaporate moisture in the moisture absorption expansion block, the moisture absorption expansion block recovers to the original state after losing moisture, and the two contacts are separated. The specific control diagram is shown in fig. 5. Can carry out automatically regulated according to the humidity size that gets into the return air duct like this, in moisture-absorbing material inflation in-process, the frosting process on the coil pipe in the return air duct is going on simultaneously, and when two contacts contact of moisture absorption inflation contact unit, the thin frost that forms on the coil pipe is not thick, scrapes easily. When the cold storage air door is closed, cold air cannot enter the cold storage chamber, the air supply and return passages are separated, the air channel circulation inside the refrigerator is mainly airflow circulation in the freezing chamber, the humidity in the return air channel is generally not large, at the moment, even if the electromagnetic valve is switched on, the times of frost scraping can be reduced, and the electric quantity is saved. Similarly, if the humidity sensor on the display of the refrigerating chamber detects that the humidity of the refrigerating chamber is low, the stored goods are dry goods, the humidity is not high, the electromagnetic valve cannot be conducted, and the power consumption can be saved.
The control assembly is used to control the drive assembly, and in one embodiment, may be a solenoid valve. Whether to turn on the solenoid valve and the number of times to turn on the solenoid valve are determined, for example, according to the humidity level of the refrigerating compartment and/or whether the damper of the refrigerating compartment is opened.
The drainage assembly discharges the frost scraped by the frost scraping assembly.
As shown in fig. 6, the drain assembly includes a frost receiving groove, a drain pipe 7, and a drip tray. The groove is arranged in the air return duct 2 of the refrigerating chamber 10 and is positioned below the coil pipe 1 in the air return duct 2, the groove is connected with the drain pipe 7, and the drain pipe 7 is connected with the water receiving plate. The sleeve can scrape the thin frost condensed on the coil pipe, the thin frost falls into the groove at the bottom of the air return channel, the thin frost is discharged through the drain pipe after being melted, and the water is discharged out of the external water receiving box to form a water seal to block external hot air from entering the air return channel. Meanwhile, the drain pipe is placed in the external environment, so that the temperature is high, and the effect of quickly defrosting can be achieved.
In a preferred embodiment, the grooves are parallel to the coils in the return duct and are inclined toward the water inlet of the drain pipe. Or the whole air return duct 2 can be in an inclined state, so that the groove and the coil in the air return duct 2 are also in an inclined state, for example, the groove and the coil are inclined by 5 degrees, so that the frost scraping can more easily fall into the groove and move to the drain pipe when the sleeve moves, the frost cannot directly enter the air return opening 8 of the refrigerating chamber or the air return opening 9 of the freezing chamber, and a frost layer can be better discharged.
The invention relates to a control method of a module for defrosting in advance, which mainly aims at controlling a solenoid valve. When the humidity of the refrigerating chamber is higher than the preset humidity and/or the air door of the refrigerating chamber is opened, the power supply of the electromagnetic valve is switched on at least once until the preset time, the electromagnetic valve is not necessarily conducted even if the power supply of the electromagnetic valve is switched on, and at the moment, if two contacts of the moisture absorption expansion contact unit are connected with each other, the electromagnetic valve is conducted, and the driving sleeve moves towards the first direction.
In addition, the duration t1 of the opening of the damper of the refrigerating chamber can be monitored, and the power-on times of the electromagnetic valve can be controlled according to the duration of the opening of the damper of the refrigerating chamber. For example, if the duration of the opening of the damper of the refrigerating chamber is less than or equal to the preset time, the power supply of the electromagnetic valve is controlled to be turned on once, and if the duration of the opening of the damper of the refrigerating chamber is greater than the preset time, the power supply of the electromagnetic valve is controlled to be turned on for a plurality of times, such as 3 times, and the like.
Because the heater can be arranged in the moisture absorption expansion block, when the electromagnetic valve is conducted, the heater in the moisture absorption expansion block of the moisture absorption expansion contact unit is electrified, after moisture in the moisture absorption expansion block is evaporated, the two contacts of the moisture absorption expansion contact unit are separated from each other, the electromagnetic valve is disconnected, and the elastic element drives the sleeve to move towards a second direction opposite to the first direction.
As shown in fig. 5, the optimal embodiment of the control method of the present invention is to determine the opening condition of the air door and the humidity condition of the refrigerating chamber in combination, and when the humidity is high, the electromagnetic valve is turned on and off in a short time to scrape the frost in a short time, so as to avoid the situation that when the frost is too thick, the movable sleeve is easily blocked and cannot move back and forth, and the frost cannot be scraped and defrosted in advance. When the refrigerating air door is opened, the low-temperature refrigerating air circulates through the air return duct, and the high humidity easily frosts on the coil pipe in the air return duct. Meanwhile, a humidity sensor of the refrigerating chamber is used for detecting whether the humidity is larger than the preset humidity (such as 40%), when the two conditions are met, the power supply of the electromagnetic valve is switched on, but if the two contacts of the moisture absorption expansion contact unit are not switched on, the whole circuit is still switched off, the electromagnetic valve cannot obtain magnetic force to attract the sleeve to move, if the amount of the humid air entering the air return channel is still small, the two contacts of the moisture absorption expansion contact unit cannot be contacted, and the sleeve cannot move. The two contacts of the hygroscopic expansion contact unit can be contacted only when the humidity is high, otherwise, frost is not necessarily generated when the frost scraping is started once the humidity is more than 40%. The key that two contacts of moisture absorption inflation contact unit contact lies in the moisture absorption volume, and the moisture absorption volume is decided by how much and the activity stroke of hygroscopic material, technical staff can determine well according to the test condition in advance, design suitable hygroscopic material's volume through verifying different humidity conditions, and the coil pipe in the return airway is frosted simultaneously in hygroscopic material moisture absorption time, the degree of frosting just accomplishes at the hygroscopic material moisture absorption, two contact contacts, thereby realize that the intelligence scrapes the frost, can not just accomplish the contact when frosting too thickly, scrape motionless easily, also can not let the contact too fast contact, the frost is scraped to frostless easily.
The refrigeration equipment of the invention adopts the module for defrosting in advance of the invention, and the refrigeration equipment comprises but is not limited to a refrigerator.
When the refrigerator works, when wet air passing through the refrigerating chamber enters the return air duct, the wet air (i.e. moisture) can frost on the surface of the coil pipe when meeting cold due to the low temperature of the coil pipe in the return air duct. When the air door of the refrigerating chamber is opened, the electromagnetic valve is powered on and powered off, the movable sleeve performs reciprocating motion once due to the action of suction, and thin frost condensed on the coil can be scraped off in the reciprocating motion process due to the small gap between the movable sleeve and the coil, falls to the groove at the bottom of the return air duct and is discharged through the drain pipe after being melted. The water is discharged out of the water receiving box at the outside to form a water seal to block the outside hot air from entering. Even if no water seal exists at first, because the pipe diameter of the drain pipe connected with the groove is thin, a small amount of hot air enters, the temperature in the refrigerator cannot be greatly influenced, and the coil pipe in the subsequent air return channel frosts and then defrosts, so that the water seal can be formed. In addition, a corresponding bent pipe part can be arranged on the drain pipe, and a water seal can be formed once water exists. The drain pipe is placed in the external environment, so the temperature is higher, and the effect of defrosting is achieved quickly.
The defrosting device can remove frost on the coil pipe in time, so that moisture of air in the refrigerating chamber is greatly reduced, the air entering the refrigerating chamber is dry air, the frosting time of the evaporator in the refrigerating chamber is greatly delayed, meanwhile, the thickness of a frost layer is reduced, the defrosting period can be prolonged, the performance is improved, and meanwhile, the power consumption can be reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (12)

1. An early defrost module, comprising:
a cooling device arranged in a refrigerating return air duct between a return air inlet of the refrigerating chamber and the evaporator of the freezing chamber and used for condensing moisture into frost before reaching the evaporator of the freezing chamber;
a defrosting device that defrosts the cooling device when the cooling device is frosted, comprising:
the defrosting device comprises a defrosting component for defrosting the cooling device, a driving component capable of driving the defrosting component to move back and forth, a control component for controlling the driving component, and a drainage component for draining frost scraped by the defrosting component;
the drive assembly includes: the device comprises an electromagnetic valve for driving the frost scraping assembly to move along a first direction, an elastic piece capable of enabling the frost scraping assembly to move along a second direction opposite to the first direction, a moisture absorption expansion contact unit connected with the electromagnetic valve in series, and a moisture absorption expansion block for controlling one contact and the other contact to be connected or separated with each other according to the humidity, wherein the moisture absorption expansion contact unit comprises two contacts arranged at intervals.
2. The early defrost module as in claim 1, wherein said cooling means is formed by a portion of the coil of the compressor's muffler assembly extending into the return duct of the refrigeration compartment.
3. The module for defrosting in advance of claim 1 wherein the frost scraping assembly is a sleeve, the sleeve is sleeved on a coil in a return air duct of the refrigerating chamber, and a gap between an inner wall of the sleeve and an outer wall of the coil is smaller than a preset distance.
4. The early defrost module of claim 1, wherein said hygroscopic expansion contact unit further comprises a heater disposed within the hygroscopic expansion block.
5. The early defrost module as in claim 1, wherein the drain assembly includes a recess in the return duct of the refrigeration compartment below the coil, a drain pipe connected to the recess, and a drip pan.
6. The early defrost module as in claim 5, wherein the grooves are parallel to coils in a return duct of the refrigeration compartment and are angled toward a water inlet of the drain duct.
7. The module for early defrosting of claim 5 wherein the outer wall of the coil in the return duct of the refrigeration compartment is provided with frosted lines.
8. A refrigerating apparatus, characterized in that an early defrost module as claimed in any of the claims 1-7 is used.
9. The refrigeration appliance according to claim 8 wherein said refrigeration appliance comprises a refrigerator.
10. A method of controlling an early defrost module as in claim 3, comprising:
when the humidity of the refrigerating chamber is larger than the preset humidity and/or the air door of the refrigerating chamber is opened, the power supply of the electromagnetic valve is switched on at least once to preset time, and if the two contacts of the moisture absorption expansion contact unit are connected with each other at the moment, the electromagnetic valve is switched on to drive the sleeve to move towards the first direction.
11. The method of controlling an early defrost module as in claim 10, further comprising:
and monitoring the duration of the opening of the air door of the refrigerating chamber, and controlling the turn-on times of the power supply of the electromagnetic valve according to the duration.
12. The method of controlling an early defrost module as in claim 10, further comprising:
when the electromagnetic valve is conducted, the heater in the moisture absorption expansion block of the moisture absorption expansion contact unit is electrified;
when moisture in the moisture absorption expansion block is evaporated, the two contacts of the moisture absorption expansion contact unit are separated from each other, the electromagnetic valve is switched off, and the sleeve is driven by the elastic element to move towards a second direction opposite to the first direction.
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CN105890242B (en) * 2016-05-31 2019-01-11 长虹美菱股份有限公司 A kind of device and method reducing evaporimeter frosting
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