WO2021258819A1 - 冰箱 - Google Patents

冰箱 Download PDF

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Publication number
WO2021258819A1
WO2021258819A1 PCT/CN2021/086986 CN2021086986W WO2021258819A1 WO 2021258819 A1 WO2021258819 A1 WO 2021258819A1 CN 2021086986 W CN2021086986 W CN 2021086986W WO 2021258819 A1 WO2021258819 A1 WO 2021258819A1
Authority
WO
WIPO (PCT)
Prior art keywords
return air
air flow
evaporator
frosting
frosting device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/086986
Other languages
English (en)
French (fr)
Inventor
李晓峰
徐同
王铭
何胜涛
刘建
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Refrigerator Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Refrigerator Co Ltd
Haier Smart Home Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Haier Refrigerator Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Refrigerator Co Ltd
Publication of WO2021258819A1 publication Critical patent/WO2021258819A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • 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
    • F25D17/045—Air flow control arrangements
    • 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
    • F25D21/04—Preventing the formation of frost or condensate
    • 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
    • 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

Definitions

  • the invention relates to refrigeration and freezing technology, in particular to a refrigerator.
  • air-cooled refrigerators usually defrost the evaporator by arranging a defrost heater below the evaporator.
  • the defrosting process of the evaporator will generate a lot of heat.
  • the temperature of the space (evaporator chamber) where the evaporator is located is relatively high.
  • the energy consumption of the refrigerator is additionally added to the power consumption to eliminate the excess heat in the evaporator room during the refrigeration process.
  • the hot air generated during the defrosting of the evaporator will also enter the storage room of the refrigerator, causing the temperature in the storage room to rise, affecting the preservation and freezing time of food, and will further increase the refrigerator’s cooling process to reduce storage.
  • a first air return port and a second air return port are respectively opened upstream of the evaporator and downstream of the evaporator in the evaporator room, and a guide plate is provided at the second return air port downstream of the evaporator. So that the return air flow entering the evaporator chamber through the second return air opening and the cooling air flow entering the evaporator chamber through the first return air opening and heat exchange through the evaporator are mixed at the guide plate, thereby producing frost at the guide plate.
  • This solution can only condense the moisture in the return air flow entering the evaporator room through the second air return port in advance at the guide plate, and can only reduce the amount of frosting of the evaporator to a certain extent, and pass through the first air return port.
  • Most of the return air flow into the evaporator chamber first flows through the evaporator and then flows to the guide plate. Before this part of the return air flow meets the guide plate, the moisture in it has already condensed into frost on the evaporator, so , The effect of this solution in solving the problem of reducing evaporator frosting is very limited.
  • part of the return air flow in this solution flows to the storage compartment without passing through the evaporator for heat exchange, which is equivalent to sacrificing the cooling effect and cooling efficiency of the refrigerator.
  • An object of the present invention is to overcome at least one defect of the prior art and provide a refrigerator capable of greatly reducing or even avoiding frosting of the evaporator.
  • a further object of the present invention is to increase the speed of condensation of moisture in the return air flow, so as to improve the thoroughness of the condensation and dehumidification of the return air flow.
  • Another further object of the present invention is to ensure that the pre-frosting device has a good frosting ability.
  • the present invention provides a refrigerator including a box body defining a freezer compartment for storing items, an evaporator compartment containing an evaporator, and a refrigerator connected between the evaporator compartment and the evaporator.
  • the return air duct is provided with a pre-frosting device that allows air flow to pass through, so that the return air flow passes through the pre-frosting device and then returns to the evaporator chamber;
  • the box body is also defined with an air induction channel for guiding part of the cooling air flow after the heat exchange by the evaporator to the pre-frosting device, so as to cool the pre-frosting device, so as When the air flow passes through the pre-frosting device, the moisture in the return air flow is condensed into frost on the pre-frosting device.
  • a heating device is provided inside the pre-frosting device, and the heating device is configured to be started in a controlled manner when the freezing compartment is in an uncooled state to heat the pre-frosting device, This promotes the melting of the frost that has condensed on the pre-condensing frost device.
  • the pre-frosting device includes a return air flow inlet for the return air flow to flow into it, and an electric control damper is provided at the return air flow inlet, and the electric control damper is configured to
  • the freezer compartment is in a non-refrigerated state, and the return air flow inlet is closed in a controlled manner before the heating device is activated.
  • a water receiving pan is provided under the pre-frosting device to receive the defrosting water generated by the defrosting of the pre-frosting device;
  • the bottom of the water receiving tray has a drain port for draining the defrosting water received in the water receiving tray to the outside of the box body.
  • the pre-frosting device includes a honeycomb-shaped heat-conducting body, and a plurality of honeycomb holes that extend along the air flow direction of the return air flow and are arranged at intervals are opened in the heat-conducting body for the return air flow. The wind flows through.
  • the honeycomb holes are arranged to extend obliquely downward or obliquely upward along the flow direction of the return air flow.
  • the heating device includes a plurality of heating wires, and each of the heating wires passes through two adjacent honeycomb holes along the extending direction of the honeycomb holes and is wound around two adjacent honeycomb holes. Between the honeycomb holes.
  • the heat conduction body is further provided with a plurality of diversion holes arranged at intervals and fluidly isolated from the honeycomb pores, and the airflow outlet of the air guide channel is in communication with the diversion holes, so that The cooling airflow flowing out of the air-inducing channel flows to the diversion hole, thereby cooling the pre-frosting device.
  • the wall of the honeycomb hole is a curved surface with a number of protrusions or pits.
  • the return air duct includes a return air opening opened on the inner wall of the freezer compartment, and the pre-frosting device is arranged at the return air opening.
  • the refrigerator of the present invention is provided with a pre-condensing device for the return air flow through the return air duct connected to the freezer compartment, and is specially designed in the box to divert part of the cooling air flow after the heat exchange through the evaporator
  • the air induction channel to the pre-condensing frosting device ingeniously cools the pre-condensing frosting device through this part of the cooling airflow. Since the temperature of the return air flow returning from the freezer compartment to the evaporator chamber is higher than the temperature of the cooling air flow after the heat exchange through the evaporator, and the return air flow carries a large amount of moisture from the freezer compartment, the humidity is higher, therefore, the temperature is higher.
  • the moisture in it will condense into frost on the pre-frosting device, so as to achieve the purpose of effectively removing the moisture inside. Since all the return air flow in the return air duct will flow through the pre-condensing device, all the return air flow to the evaporator is the air flow after defrosting and dehumidification, which greatly reduces the frosting of the evaporator or even avoids it. The evaporator is frosted, which improves the cooling efficiency and cooling effect of the evaporator.
  • the pre-frosting device of the present application is specially designed to have a honeycomb-shaped heat-conducting body, and the heat-conducting body is provided with a plurality of honeycomb holes arranged at intervals, and the return air flow can flow through the pre-frosting device through the honeycomb holes.
  • the honeycomb-shaped heat-conducting body has better cooling capacity and a larger contact area with the return air flow. Therefore, it can increase the speed of condensation of moisture in the return air flow on the heat-conducting body, thereby increasing the resistance to the return air flow. The thoroughness of the flow of frost and dehumidification further reduces or even avoids the frosting of the evaporator.
  • the pre-condensing device of the present application is also provided with a heating device, which can heat the pre-condensing device through the heating device, so as to remove the condensed frost generated on the pre-condensing device and avoid affecting the normal flow of the return air flow. At the same time, it can also restore the better frosting ability of the pre-frosting device.
  • Fig. 1 is a schematic perspective view of a refrigerator according to an embodiment of the present invention when a pre-frosting device is not installed;
  • FIG. 2 is a schematic perspective view of a refrigerator after installing a pre-frosting device according to an embodiment of the present invention
  • Fig. 3 is a partial structural diagram of a refrigerator according to an embodiment of the present invention.
  • Figure 4 is a schematic structural diagram of a pre-frosting device according to an embodiment of the present invention.
  • Figures 5 and 6 are respectively schematic cross-sectional views of the pre-frosting device taken along cut lines in different directions.
  • Figure 1 is a schematic perspective view of a refrigerator according to an embodiment of the present invention when the pre-frosting device is not installed
  • Figure 2 is a schematic perspective view of a refrigerator according to an embodiment of the present invention after the pre-frosting device is installed
  • Figure 3 is a schematic perspective view of a refrigerator according to an embodiment of the present invention.
  • the refrigerator 1 of the present invention includes a box body 10, the box body 10 defines a freezer compartment 110 for storing items, an evaporator chamber 120 containing an evaporator 20, connected to the evaporator chamber 120 Between the freezer compartment 110 and the freezer compartment 110, the return air flow in the freezer compartment 110 can return to the return air duct 140 of the evaporator compartment 120. Furthermore, the box body 10 may further define an air supply duct 130 connected between the evaporator chamber 120 and the freezing compartment 110 for the cooling airflow in the evaporator compartment 120 to flow to the freezing compartment 110.
  • the supply air duct 130 may have a plurality of air outlets 131 communicating with the freezing compartment 110
  • the return air duct 140 may have a return air outlet 141 communicating with the freezing compartment 110.
  • the refrigerator 1 may further include a fan 40 arranged in the evaporator chamber 120 for driving the cooling air flow after the heat exchange by the evaporator 20 to flow to the air supply duct 130.
  • the evaporator 20 exchanges heat with the airflow passing through it to generate a cooling airflow.
  • the cooling airflow generated by the evaporator 20 flows to the air supply duct 130 and is sent to the freezing compartment 110 through the air outlet 131
  • the return air flow in the freezer compartment 110 flows to the return air duct 140 through the return air opening 141, and returns to the evaporator chamber 120 through the return air duct 140 to continue heat exchange with the evaporator 20. Since the air circulation path and principle of the refrigerator are well known to those skilled in the art, it will not be repeated here.
  • the return air duct 140 is provided with a pre-frosting device 30 that allows airflow to pass through, so that the return air flow flowing through the return air duct 140 flows through the pre-frosting device 30 and then returns to the evaporator chamber 120.
  • the box body 10 also defines an air induction channel 150 for guiding part of the cooling air flow after the heat exchange by the evaporator 20 to the pre-frosting device 30, so as to cool the pre-frosting device 30 so that the return air flows through During the pre-frosting device 30, the moisture (humidity) in the return air flow is condensed into frost on the pre-frosting device 30.
  • the temperature of the pre-frosting device 30 after this part of the cooling air flow is at least lower than that when only the return air flow passes through the pre-frosting device 30
  • the temperature of the frosting device 30 is only when the return air flows through the pre-frosting device 30, and the temperature of the pre-frosting device 30 is close to the temperature of the return air flow.
  • the refrigerator 1 of the present invention is provided with a pre-frosting device 30 in the return air duct 140 connected to the freezer compartment 110 for the return air flow to flow through, and the cabinet 10 is specially designed to replace the evaporator 20.
  • the heated part of the cooling airflow is guided to the air induction channel 150 of the pre-frosting device 30, and this part of the cooling airflow is skillfully used to cool the pre-frosting device 30.
  • the temperature of the return air flow returning from the freezer compartment 110 to the evaporator chamber 120 is higher than the temperature of the cooling air flow after heat exchange by the evaporator 20, and the return air flow carries a large amount of water vapor from the freezer compartment 110, resulting in high humidity Therefore, after the return air flow with higher temperature and higher humidity meets the pre-frosting device 30 with lower temperature, the water vapor (humidity) in it will condense into frost on the pre-frosting device 30, thereby achieving In order to effectively remove the moisture (moisture) in it.
  • the temperature of the pre-frosting device 30 after cooling by the cooling air flow is lower. Therefore, the moisture in the return air flow meets The pre-frosting device 30 will directly condense into frost on the pre-frosting device 30 afterwards. After the refrigerator 1 is used for a long time, the frost layer on the pre-frosting device 30 will become thicker and thicker.
  • the material of the pre-condensing frost device 30 can be a metal material to ensure that it has good thermal conductivity, so that the cold energy of the cooling airflow is quickly transferred to the pre-condensing frost device 30, and the cooling capacity is transferred to the pre-condensing frost. After the device 30 can be quickly and evenly transferred to the entire pre-frosting device 30, the uniformity of condensation and dehumidification of the return air flow is improved.
  • a heating device is provided inside the pre-frosting device 30, and the heating device is configured to be in a non-cooling state in the freezer compartment 110. It is activated in a controlled manner during the state to heat the pre-frosting device 30 so as to promote the melting of the frost condensed on the pre-frosting device 30.
  • the pre-condensing device 30 can be heated by the heating device, so as to remove the condensed frost generated on the pre-condensing device 30, avoid affecting the normal flow of the return air flow, and restore the pre-condensing device 30 at the same time. Good frosting ability.
  • the heating device is activated only when the freezer compartment 110 is in an uncooled state (that is, the refrigerator 1 is temporarily stopped when the freezer compartment 110 reaches the set temperature), which can prevent the heat generated by the heating device 30 from flowing into the evaporator with the return air flow
  • the chamber 120 affects the cooling effect of the evaporator 20, and also reduces the energy consumption when the evaporator 20 is refrigerated again.
  • the pre-frosting device 30 includes a return air flow inlet 311 for the return air flow to flow into.
  • the return air flow inlet 311 is provided with an electric control damper 33, which is arranged in the freezer compartment. 110 is in a non-cooling state, and the return air inlet 311 is closed in a controlled manner before the heating device is activated.
  • the electronic control damper 33 is controlled to close the return air inlet 311, thereby effectively preventing the heat generated by the defrosting of the pre-frosting device 30 from spreading to the freezing
  • the compartment 110 has an influence on the freezing storage effect of the freezing compartment 110.
  • the pre-frosting device 30 includes a return air flow outlet for the return air flow to flow out, and an electric control damper may also be provided at the return air flow inlet.
  • the electric control damper is configured to be located in the freezer compartment 110 In the non-cooling state, and before the heating device is started, the return air flow outlet is closed in a controlled manner.
  • the electronic control damper should be controlled to close the return air flow outlet, thereby further effectively preventing the heat generated by the pre-condensing device 30 from being defrosted from spreading to the evaporation.
  • the chamber 120 affects the cooling effect of the evaporator 20 and reduces energy consumption.
  • the pre-frosting device 30 may include a metal shell 31 which is open along two opposite sides in the flow direction of the return air flow, thereby forming a return air flow inlet 311 and a return air flow outlet respectively.
  • the return air duct 140 includes a return air opening 141 opened on the inner wall of the freezer compartment 110, and the pre-frosting device 30 is provided at the return air opening 141 to facilitate the installation of the pre-frosting device 30.
  • the pre-condensation device 30 is equivalent to the most upstream position of the return air duct 140, and can condense and dehumidify the return air flow at the most upstream of the return air duct 140, thereby To a certain extent, it is avoided that condensation occurs in the return air duct 140 and affects the normal flow of the return air flow.
  • the pre-frosting device 30 can be clamped at the return air opening 141, and the shape of the pre-frosting device 30 matches the shape of the return air opening 141, so that all the return air flow returning from the freezing compartment 110 flows through
  • the pre-condensing frost device 30 ensures the thoroughness of condensing and dehumidifying the return air flow.
  • a water receiving pan 50 is provided under the pre-frosting device 30 to receive the condensed water generated by the defrosting of the pre-frosting device 30. As a result, it can be avoided that the condensed water directly drips under the pre-frosting device 30, causing water accumulation to affect the user experience.
  • the bottom of the drain pan 50 has a drain 51 for draining the condensed water received in the drain pan 50 to the outside of the box body 10 to avoid excessive condensate in the drain pan 50 from overflowing.
  • the bottom of the evaporator chamber 120 may be provided with a drain hole
  • the refrigerator 1 further includes a drain pipe connecting the drain hole and the outside of the cabinet to discharge the condensate generated by the defrosting of the evaporator 20 to the cabinet through the drain hole and the drain pipe.
  • Body 10 outside. Since the design of the drain hole and drain pipe at the bottom of the evaporator chamber 120 is a common structure in existing refrigerators, it will not be repeated here.
  • the drain port 51 at the bottom of the drain pan 50 may be connected to a drain pipe, so as to drain the condensed water in the drain pan 50 to the outside of the box through the drain pipe.
  • the refrigerator 1 may be additionally provided with an additional drain pipe communicating with the outside of the cabinet 10, and the drain port 51 at the bottom of the water receiving tray 50 is connected with an additional drain pipe to connect the water receiving tray 50 through the additional drain pipe.
  • the condensed water inside is discharged to the outside of the box.
  • the additional drain pipe can be arranged in parallel with the drain pipe.
  • Fig. 4 is a schematic structural diagram of a pre-frosting device according to an embodiment of the present invention
  • Figs. 5 and 6 are respectively schematic cross-sectional views of the pre-frosting device taken along cut lines in different directions.
  • the pre-frosting device 30 includes a honeycomb-shaped heat-conducting body 32, and a plurality of honeycomb holes 321 that extend along the air flow direction of the return air flow and are arranged at intervals are opened in the heat conduction body 32 to supply the return air flow. flow past. The return air flow can flow through the pre-frosting device 30 through a plurality of honeycomb holes 321.
  • This honeycomb-shaped heat-conducting body 32 has better cooling capacity and a larger contact area with the return air flow, so it can improve the return air flow.
  • the speed at which the water vapor (or moisture) in the flow condenses on the heat conducting body 32, thereby improving the thoroughness of defrosting and dehumidifying the return air flow, and further reducing or even avoiding the frosting of the evaporator 20.
  • the wall of the honeycomb hole 321 is designed to have a curved surface with a number of protrusions or pits, which further increases the contact area between the return air flow and the pre-frosting device 30, thereby further accelerating the return. The speed at which the moisture in the wind flow condenses on the pre-frosting device 30.
  • the heat conducting body 32 is also provided with a plurality of diversion holes 322 arranged at intervals and fluidly isolated from the honeycomb holes 321, and the airflow outlet 151 of the air induction channel 150 is in communication with the diversion holes 322, so that the guide The cooling airflow flowing out of the wind channel 150 flows into the guide hole 322 to cool the pre-frosting device 30.
  • a plurality of air guide holes 322 are arranged at intervals in the heat conducting body 32 to divide the cooling air flow from the air induction channel 150, so as to transfer the cold amount of the cooling air flow to the heat conducting body 32 in a more balanced manner, so as to flow through the honeycombs.
  • the moisture in the return air flow of the holes 321 can condense into frost on the inner wall of the honeycomb holes 321, and the moisture in the return air flow can be frosted more evenly in the honeycomb holes 321.
  • the metal casing 31 may be provided with through holes 312 for the cooling airflow to flow into the diversion holes 322, and the through holes 312 and the diversion holes 322 are arranged in a one-to-one correspondence.
  • the other end of the guide hole 322 may be connected to the return air duct 140, so that the cooling air flow after cooling the pre-frosting device 30 is mixed into the return air flow, and returns to the evaporator chamber with the return air flow. 120 participates in the heat exchange to make up for the problem of reducing the flow of cooling air supplied to the freezing compartment 110 caused by the partial cooling air flow directed to the pre-condensing device 30.
  • the extending direction of the honeycomb holes 321 and the extending direction of the guide holes 322 are at an angle of less than or equal to 90 degrees, so that the flow direction of the return air flow in the honeycomb holes 321 and the flow of the cooling air flow in the guide holes 322 The angle between the directions is less than or equal to 90 degrees. In this way, it can be avoided that the cooling air flow flowing out of the guide hole 322 generates a relatively large reverse resistance to the return air flow and affects the normal flow of the return air flow.
  • the cooling airflow flowing out of the air induction channel 150 may also be directly blown to the heat guiding body 32.
  • the heating device includes a plurality of heating wires 61, and each heating wire 61 passes through two adjacent honeycomb holes 321 along the extending direction of the honeycomb holes 321 and is looped around the two adjacent honeycomb holes 321. between.
  • the heating wire 61 arranged in this way has a larger contact area with the honeycomb holes 321, which can effectively remove the frost inside the elongated honeycomb holes 321.
  • the arrangement method of loop-shaped winding between two adjacent honeycomb holes 321 is more stable, and it is not easy to fall off.
  • a plurality of heating wires 61 are evenly distributed among the plurality of honeycomb holes 321 to uniformly defrost the heat-conducting body 32.
  • the honeycomb holes 321 are arranged to extend obliquely downward or obliquely upward along the flow direction of the return air flow. In order for the defrosting water to flow out of the honeycomb holes 321 quickly, it is avoided that the defrosting water stays in the honeycomb holes 321 and condenses into frost again and affects the condensation and dehumidification effect on the return air flow.
  • the box body 10 also defines a supply air duct 130 connected between the evaporator compartment 120 and the freezer compartment 110 for the cooling air flow in the evaporator compartment 120 to flow to the freezer compartment 110, and the induced air duct 150 communicates with the supply air.
  • Road 130 and pre-condensing frosting device 30 may be connected to the air supply air duct 130 through the air inlet 152 so that part of the cooling air flow in the air supply air duct 130 flows into the air induction channel 150 through the air inlet 152.
  • the air outlet 152 of the air induction channel 150 can be in sealed communication with the diversion hole 322 of the pre-frosting device 30, or can be in open communication, as long as the cooling airflow can flow through the diversion hole 322.
  • the box body 10 only defines a freezer compartment 110 and one storage compartment.
  • the evaporator compartment 120 may be located at the rear side of the freezer compartment 110.
  • other storage compartments may be defined in the box body 10, such as a refrigerating compartment, and the refrigerating compartment may be above the freezing compartment 110 at this time.
  • the above technical solution of the present invention is not only applicable to refrigerators having only the freezer compartment 110, but also applicable to refrigerators having other storage compartments in addition to the freezer compartment 110.
  • the freezer compartment 110 and the evaporator compartment 120 There are no restrictions or requirements on the relative positional relationship between.
  • a part of the cooling airflow generated by the heat exchange of the evaporator 20 is sent to the freezing compartment 110 through the air supply duct 130 and the air outlet 131, and this part of the airflow passes through the freezing compartment 110 and reaches the return
  • the tuyere 141 becomes the return air flow whose temperature is higher than the temperature of the cooling air flow, and the humidity is relatively high
  • the other part is sent to the pre-condensing frosting device 30 through the induced air passage 150, and the pre-condensing frosting device 30 is cooled and the temperature is close to The temperature of the cooling airflow is close to the temperature of the evaporator.
  • the temperature of the pre-frosting device 30 is low, when the return air flow with higher temperature and higher humidity flows through the pre-frosting device 30, the moisture in it will condense into frost on the pre-frosting device 30, which reduces The humidity of the air blown to the evaporator 20 is reduced, thereby reducing or even avoiding the frosting of the evaporator 20.
  • the electric control damper 33 can be closed, and the heating device can be started.
  • the heating device is preferably a low-power heating wire, which can melt a small amount of frost generated on the pre-frosting device 30. The defrost produced by melting drips into the water receiving pan 50 under the pre-frosting device 30 and is discharged out of the box through the drain hole 51.
  • the refrigerator 1 of the present invention includes not only refrigerators in the ordinary sense, but also other refrigerating and freezing devices with functions similar to refrigerators, for example, freezers, freezers, and refrigerators.

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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)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)

Abstract

一种冰箱，包括箱体，箱体内限定有用于储存物品的冷冻间室、容置有蒸发器的蒸发器室、以及连接在蒸发器室与冷冻间室之间以供冷冻间室内的回风气流返回蒸发器室的回风风道。回风风道设有允许气流穿过的预凝霜装置，以使得回风气流流经预凝霜装置后再返回蒸发器室。箱体内还限定有用于将经蒸发器换热后的部分冷却气流引流至预凝霜装置的引风通道，以对预凝霜装置进行降温，从而在回风气流流经预凝霜装置时使得回风气流中的湿气在预凝霜装置上凝结成霜，达到了有效除去其内湿气的目的。由于流向蒸发器的全部回风气流都是经过凝霜除湿后的气流，较大程度地减少了蒸发器结霜甚至避免了蒸发器结霜，提高了蒸发器的制冷效率和制冷效果。

Description

冰箱 技术领域
本发明涉及冷藏冷冻技术，特别是涉及一种冰箱。
背景技术
目前，风冷冰箱通常采用在蒸发器下方布置除霜加热器的方式对蒸发器进行除霜。然而，蒸发器除霜的过程会产生大量的热量，当除霜停止时，蒸发器所处的空间(蒸发器室)温度较高，在压缩机开机后的制冷过程中，需要损耗较多的能量来带走蒸发器室内的多余热量。因此，冰箱的能耗又额外新增了制冷过程中为消除蒸发器室内多余热量的功耗。另外，蒸发器除霜时产生的热气还会进入冰箱的储物间室内，导致储物间室内的温度上升，影响食物的保鲜和冷冻时间，同时也会进一步增加冰箱在制冷过程中为降低储物间室内的温度所需要的能耗。因此，最好能够减少或者避免蒸发器结霜。
为了解决上述技术问题，现有技术中在蒸发器室内的蒸发器上游和蒸发器下游分别开设第一回风口和第二回风口，并在位于蒸发器下游的第二回风口处设置引流板，以使得经第二回风口进入蒸发器室内的回风气流与经第一回风口进入蒸发器室并经蒸发器换热后的冷却气流在引流板处混合，从而在引流板处产生凝霜。这种方案仅能够将通过第二回风口进入蒸发器室内的回风气流中的湿气在引流板处提前凝霜，仅能够在一定程度上减少蒸发器的结霜量，经第一回风口流入蒸发器室内的大部分回风气流都先流经蒸发器后再流向引流板，这部分回风气流在遇到引流板之前，其内的湿气早已在蒸发器上凝结成霜了，因此，该方案在解决减少蒸发器结霜这一问题时的效果是非常有限的。况且，该方案中的部分回风气流并不经过蒸发器换热就流向储物间室，相当于牺牲了冰箱的制冷效果和制冷效率。
发明内容
本发明的一个目的旨在克服现有技术的至少一个缺陷，提供一种能够较大程度地减少蒸发器结霜甚至避免蒸发器结霜的冰箱。
本发明的一个进一步的目的是提高回风气流中湿气凝华的速度，以提高回风气流凝霜除湿的彻底性。
本发明的另一个进一步的目的是确保预凝霜装置具有较好的凝霜能力。
为了实现上述目的，本发明提供一种冰箱，包括箱体，所述箱体内限定有用于储存物品的冷冻间室、容置有蒸发器的蒸发器室、以及连接在所述蒸发器室与所述冷冻间室之间以供所述冷冻间室内的回风气流返回所述蒸发器室的回风风道；其中
所述回风风道设有允许气流穿过的预凝霜装置，以使得所述回风气流流经所述预凝霜装置后再返回所述蒸发器室；且
所述箱体内还限定有用于将经所述蒸发器换热后的部分冷却气流引流至所述预凝霜装置的引风通道，以对所述预凝霜装置进行降温，从而在所述回风气流流经所述预凝霜装置时使得所述回风气流中的湿气在所述预凝霜装置上凝结成霜。
可选地，所述预凝霜装置的内部设有加热装置，所述加热装置配置成在所述冷冻间室处于非制冷状态时受控地启动，以对所述预凝霜装置进行加热，从而促使所述预凝霜装置上凝结的霜融化。
可选地，所述预凝霜装置包括用于供所述回风气流流入其中的回风气流入口，所述回风气流入口处设有电控风门，所述电控风门配置成在所述冷冻间室处于非制冷状态、且所述加热装置启动之前受控地关闭所述回风气流入口。
可选地，所述预凝霜装置的下方设有接水盘，以用于承接所述预凝霜装置化霜产生的化霜水；且
所述接水盘的底部具有排水口，以用于将所述接水盘内承接的化霜水排放至所述箱体外部。
可选地，所述预凝霜装置包括蜂窝状的导热本体，所述导热本体内开设有沿所述回风气流的气流流动方向延伸且间隔排布的多个蜂窝孔，以供所述回风气流流过。
可选地，所述蜂窝孔设置成沿所述回风气流的流动方向倾斜向下延伸或倾斜向上延伸。
可选地，所述加热装置包括若干个加热丝，每个所述加热丝均沿所述蜂窝孔的延伸方向穿过相邻两个所述蜂窝孔并回形地缠绕在相邻两个所述蜂窝孔之间。
可选地，所述导热本体内还开设有间隔排布且与所述蜂窝孔流体隔离的多个导流孔，所述引风通道的气流出口与所述导流孔连通，以使得从所述引 风通道流出的冷却气流流向所述导流孔，从而对所述预凝霜装置进行降温。
可选地，所述蜂窝孔的孔壁为具有若干凸起或凹坑的曲面。
可选地，所述回风风道包括开设在所述冷冻间室的内胆壁上的回风口，所述预凝霜装置设置在所述回风口处。
本发明的冰箱在连通冷冻间室的回风风道内设有供回风气流流过的预凝霜装置，并且在箱体内特别地设计有用于将经过蒸发器换热后的部分冷却气流引流至预凝霜装置的引风通道，巧妙地通过该部分冷却气流对预凝霜装置进行降温。由于从冷冻间室返回蒸发器室的回风气流的温度高于经蒸发器换热后的冷却气流的温度，且回风气流从冷冻间室内携带大量水气导致湿度较大，因此，温度较高且湿度较高的回风气流遇到温度较低的预凝霜装置后，其内的湿气会在预凝霜装置上凝结成霜，从而达到了有效除去其内湿气的目的。由于回风风道内的全部回风气流都会流经预凝霜装置，因此流向蒸发器的全部回风气流都是经过凝霜除湿后的气流，较大程度地减少了蒸发器结霜甚至避免了蒸发器结霜，提高了蒸发器的制冷效率和制冷效果。
进一步地，本申请的预凝霜装置特别设计成具有蜂窝状的导热本体，且导热本体内开设有间隔排布的多个蜂窝孔，回风气流可通过蜂窝孔流过预凝霜装置，这种蜂窝状的导热本体传冷能力较好，且与回风气流之间的接触面积较大，因此能够提高回风气流中的湿气在导热本体上凝华的速度，从而提高了对回风气流进行凝霜除湿的彻底性，进一步减少甚至避免了蒸发器结霜。
进一步地，本申请的预凝霜装置还设有加热装置，可通过加热装置对预凝霜装置进行加热，从而去除预凝霜装置上产生的凝霜，避免对回风气流的正常流动产生影响，同时还可以恢复预凝霜装置较好的凝霜能力。
根据下文结合附图对本发明具体实施例的详细描述，本领域技术人员将会更加明了本发明的上述以及其他目的、优点和特征。
附图说明
后文将参照附图以示例性而非限制性的方式详细描述本发明的一些具体实施例。附图中相同的附图标记标示了相同或类似的部件或部分。本领域技术人员应该理解，这些附图未必是按比例绘制的。附图中：
图1是根据本发明一个实施例的冰箱未安装预凝霜装置时的示意性透视 图；
图2是根据本发明一个实施例的冰箱安装预凝霜装置后示意性透视图；
图3是根据本发明一个实施例的冰箱的部分结构示意图；
图4是根据本发明一个实施例的预凝霜装置的示意性结构图；
图5和图6分别是沿不同方向的剖切线对预凝霜装置进行剖切截取的示意性剖视图。
具体实施方式
图1是根据本发明一个实施例的冰箱未安装预凝霜装置时的示意性透视图，图2是根据本发明一个实施例的冰箱安装预凝霜装置后示意性透视图，图3是根据本发明一个实施例的冰箱的部分结构示意图。参见图1至图3，本发明的冰箱1包括箱体10，箱体10内限定有用于储存物品的冷冻间室110、容置有蒸发器20的蒸发器室120、连接在蒸发器室120与冷冻间室110之间以供冷冻间室110内的回风气流返回蒸发器室120的回风风道140。进一步地，箱体10内还可限定有连接在蒸发器室120与冷冻间室110之间以供蒸发器室120内的冷却气流流向冷冻间室110的送风风道130。并且，送风风道130可具有与冷冻间室110连通的多个出风口131，回风风道140可具有与冷冻间室110连通的回风口141。冰箱1还可包括设置在蒸发器室120内的风机40，用于驱动经蒸发器20换热后的冷却气流流向送风风道130。在冷冻间室110制冷时，蒸发器20与流经其的气流进行热交换从而产生冷却气流，蒸发器20产生的冷却气流流向送风风道130，并经出风口131送往冷冻间室110；冷冻间室110内的回风气流经回风口141流向回风风道140，并通过回风风道140返回蒸发器室120继续与蒸发器20进行换热。由于冰箱的气流循环路径及其原理是本领域技术人员习知的，因此这里不再赘述。
特别地，回风风道140设有允许气流穿过的预凝霜装置30，以使得流经回风风道140的回风气流流经预凝霜装置30后再返回蒸发器室120。箱体10内还限定有用于将经蒸发器20换热后的部分冷却气流引流至预凝霜装置30的引风通道150，以对预凝霜装置30进行降温，从而在回风气流流经预凝霜装置30时使得回风气流中的水气(湿气)在预凝霜装置30上凝结成霜。可以理解的是，因为冷却气流的温度低于回风气流的温度，因此经该部分冷却气流降温后的预凝霜装置30的温度至少低于只有回风气流流过预凝霜装 置30时预凝霜装置30的温度，只有回风气流流过预凝霜装置30时，预凝霜装置30的温度接近回风气流的温度。
本发明的冰箱1在连通冷冻间室110的回风风道140内设有供回风气流流过的预凝霜装置30，并且在箱体10内特别地设计有用于将经过蒸发器20换热后的部分冷却气流引流至预凝霜装置30的引风通道150，巧妙地利用该部分冷却气流对预凝霜装置30进行降温。由于从冷冻间室110返回蒸发器室120的回风气流的温度高于经蒸发器20换热后的冷却气流的温度，且回风气流从冷冻间室110内携带大量水气导致湿度较大，因此，温度较高且湿度较高的回风气流遇到温度较低的预凝霜装置30后，其内的水气(湿气)会在预凝霜装置30上凝结成霜，从而达到了有效除去其内水气(湿气)的目的。由于回风风道内的全部回风气流都会流经预凝霜装置30，因此流向蒸发器20的全部回风气流都是经过凝霜除湿后的气流，较大程度地减少了蒸发器20结霜甚至避免了蒸发器20结霜，提高了蒸发器20的制冷效率和制冷效果。
由于冷冻间室110内的储藏温度低于零度，回风气流的温度也低于零度，经冷却气流降温后的预凝霜装置30的温度更低，因此，回风气流中的水气遇到预凝霜装置30后会在预凝霜装置30上直接凝华成霜。冰箱1长时间使用后，预凝霜装置30上的霜层会越来越厚。
具体地，预凝霜装置30的材质可以为金属材质，以确保其具有良好的导热能力，从而使得冷却气流的冷量快速地传递至预凝霜装置30，并且，冷量传递至预凝霜装置30后可快速均匀地传递至整个预凝霜装置30，提高了回风气流冷凝除湿的均匀性。
在一些实施例中，为了避免预凝霜装置30上的霜层对冰箱1的正常使用产生影响，预凝霜装置30的内部设有加热装置，加热装置配置成在冷冻间室110处于非制冷状态时受控地启动，以对预凝霜装置30进行加热，从而促使预凝霜装置30上凝结的霜融化。也就是说，可通过加热装置对预凝霜装置30进行加热，从而去除预凝霜装置30上产生的凝霜，避免对回风气流的正常流动产生影响，同时还可以恢复预凝霜装置30较好的凝霜能力。加热装置只有在冷冻间室110处于非制冷状态(也即是冰箱1处于冷冻间室110达到设定温度而临时停机)时才启动，可避免加热装置30产生的热量随回风气流流入蒸发器室120影响蒸发器20的制冷效果，同时还降低了蒸发 器20再次制冷时产生的能耗。
在一些实施例中，预凝霜装置30包括用于供回风气流流入其中的回风气流入口311，回风气流入口311处设有电控风门33，电控风门33配置成在冷冻间室110处于非制冷状态、且加热装置启动之前受控地关闭回风气流入口311。也就是说，当冷冻间室110处于非制冷状态需要启动加热装置之前，先控制电控风门33关闭回风气流入口311，从而有效地避免了预凝霜装置30除霜产生的热量扩散至冷冻间室110对冷冻间室110的冷冻储藏效果产生影响。
在一些实施例中，预凝霜装置30包括用于供回风气流流出的回风气流出口，回风气流入口处也可设有电控风门，该电控风门配置成在冷冻间室110处于非制冷状态、且加热装置启动之前受控地关闭回风气流出口。也就是说，当冷冻间室110处于非制冷状态需要启动加热装置之前，先控制该电控风门关闭回风气流出口，从而进一步有效地避免了预凝霜装置30除霜产生的热量扩散至蒸发器室120影响蒸发器20的制冷效果，降低了能耗。
具体地，预凝霜装置30可包括金属外壳31，金属外壳31沿回风气流流动方向上的两个相对的侧部敞开，从而分别形成了回风气流入口311和回风气流出口。
在一些实施例中，回风风道140包括开设在冷冻间室110的内胆壁上的回风口141，预凝霜装置30设置在回风口141处，以便于预凝霜装置30的安装。同时，在回风气流的流动方向上，预凝霜装置30相当于处于回风风道140的最上游位置处，可以在回风风道140的最上游就对回风气流进行冷凝除湿，从而在一定程度上避免回风风道140内产生凝霜而影响回风气流的正常流动。
进一步地，预凝霜装置30可卡设在回风口141处，且预凝霜装置30的外形与回风口141的形状相匹配，以使得从冷冻间室110返回的全部回风气流都流经预凝霜装置30，从而确保对回风气流进行冷凝除湿的彻底性。
在一些实施例中，预凝霜装置30的下方设有接水盘50，以用于承接预凝霜装置30化霜产生的冷凝水。由此，可避免冷凝水直接滴落在预凝霜装置30的下方造成积水影响用户的使用体验。
进一步地，接水盘50的底部具有排水口51，以用于将接水盘50内承接的冷凝水排放至箱体10外部，避免接水盘50内的冷凝水过多而溢出。
具体地，蒸发器室120的底部可设有排水孔，冰箱1还包括连通排水孔和箱体外部的排水管，以通过排水孔和排水管将蒸发器20化霜产生的冷凝水排放至箱体10外部。由于蒸发器室120底部排水孔和排水管的设计是现有冰箱中普遍具有的结构，因此这里不再赘述。
在一些实施例中，接水盘50底部的排水口51可与排水管连通，以通过排水管将接水盘50内的冷凝水排放至箱体外。
在另一些实施例中，冰箱1还可以另外设置一个与箱体10外部连通的附加排水管，接水盘50底部的排水口51与附加排水管相连，以通过附加排水管将接水盘50内的冷凝水排放至箱体外。附加排水管可与排水管平行设置。
图4是根据本发明一个实施例的预凝霜装置的示意性结构图，图5和图6分别是沿不同方向的剖切线对预凝霜装置进行剖切截取的示意性剖视图。在一些实施例中，预凝霜装置30包括蜂窝状的导热本体32，导热本体32内开设有沿回风气流的气流流动方向延伸且间隔排布的多个蜂窝孔321，以供回风气流流过。回风气流可通过多个蜂窝孔321流过预凝霜装置30，这种蜂窝状的导热本体32传冷能力较好，且与回风气流之间的接触面积较大，因此能够提高回风气流中的水气(或湿气)在导热本体32上凝华的速度，从而提高了对回风气流进行凝霜除湿的彻底性，进一步减少甚至避免了蒸发器20结霜。
由于回风气流经蜂窝孔321流过预凝霜装置30，回风气流与蜂窝孔321的孔壁直接接触。为此，在一些实施例中，将蜂窝孔321的孔壁设计成具有若干凸起或凹坑的曲面，进一步增大了回风气流与预凝霜装置30的接触面积，从而进一步加快了回风气流中的湿气在预凝霜装置30上凝华的速度。
在一些实施例中，导热本体32内还开设有间隔排布且与蜂窝孔321流体隔离的多个导流孔322，引风通道150的气流出口151与导流孔322连通，以使得从引风通道150流出的冷却气流流向导流孔322，从而对预凝霜装置30进行降温。多个导流孔322在导热本体32内间隔排布，以便对引风通道150流出的冷却气流进行分流，从而将冷却气流的冷量较为均衡地传递至导热本体32，进而使得流经各个蜂窝孔321的回风气流中的湿气均能够在蜂窝孔321的内壁上凝结成霜，且回风气流中的湿气在蜂窝孔321内结霜的更加均匀。
同时，由于供回风气流流过的蜂窝孔321和供冷却气流流过的导流孔322在流体上相互隔离，因此，可避免冷却气流会回风气流的正常流动产生影响。当预凝霜装置30具有金属壳体31时，金属壳体31上可开设有用于供冷却气流流入导流孔322的通孔312，通孔312与导流孔322一一对应设置。
进一步地，导流孔322的另一端可与回风风道140连通，以便于使对预凝霜装置30进行降温后的冷却气流混合到回风气流中，并随回风气流返回蒸发器室120参与换热，以弥补将部分冷却气流引流至预凝霜装置30产生的供向冷冻间室110的冷却气流量减少的问题。具体地，蜂窝孔321的延伸方向与导流孔322的延伸方向呈小于等于90度的夹角，以使得蜂窝孔321内的回风气流的流动方向与导流孔322内的冷却气流的流动方向之间呈小于等于90度的夹角。由此，可避免从导流孔322流出的冷却气流对回风气流产生较大的逆向阻力而影响回风气流的正常流动。
在一些替代性实施例中，从引风通道150流出的冷却气流也可以直接吹向导热本体32。
在一些实施例中，加热装置包括若干个加热丝61，每个加热丝61均沿蜂窝孔321的延伸方向穿过相邻两个蜂窝孔321并回形地缠绕在相邻两个蜂窝孔321之间。这种方式布置的加热丝61与蜂窝孔321的接触面积较大，能够将细长型的蜂窝孔321内部的结霜有效地去除。并且，回形缠绕在相邻两个蜂窝孔321之间的布置方法更加稳固，不易脱落。
进一步地，若干个加热丝61均匀地分布在多个蜂窝孔321之间，以对导热本体32进行均匀地除霜。
为了避免预凝霜装置30除霜后产生的化霜水滞留在蜂窝孔321中，在一些实施例中，将蜂窝孔321设置成沿回风气流的流动方向倾斜向下延伸或倾斜向上延伸，以便于化霜水快速地流出蜂窝孔321，从而避免化霜水滞留在蜂窝孔321中再次凝结成霜影响对回风气流的冷凝除湿效果。
箱体10内还限定有连接在蒸发器室120与冷冻间室110之间以供蒸发器室120内的冷却气流流向冷冻间室110的送风风道130，引风通道150连通送风风道130和预凝霜装置30。具体地，引风通道150可通过气流入口152与送风风道130连通，以便于送风风道130内的部分冷却气流经气流入口152流入引风通道150内。引风通道150的气流出口152可与预凝霜装置 30的导流孔322密封地连通，也可以开放式连通，只要能够使得冷却气流流向导流孔322即可。
需要说明的是，图1和图2所示实施例中，箱体10内仅限定有冷冻间室110一个储物间室，此时，蒸发器室120可处于冷冻间室110的后侧。在另一些实施例中，箱体10内还可限定有其他储物间室，例如冷藏间室，此时冷藏间室可处于冷冻间室110的上方。本发明的上述技术方案不但适用于只具有冷冻间室110的冰箱，还适用于除了冷冻间室110之外，还具有其他储物间室的冰箱，对于冷冻间室110与蒸发器室120之间的相对位置关系没有限制或要求。
本发明的冰箱1在制冷过程中，经蒸发器20换热产生的冷却气流一部分通过送风风道130和出风口131送往冷冻间室110，这部分气流流经冷冻间室110后达到回风口141时变成温度高于冷却气流温度的回风气流，且湿度较大；另一部分通过引风通道150送往预凝霜装置30，对预凝霜装置30进行制冷降温，使其温度接近冷却气流温度，即接近蒸发器温度。由于预凝霜装置30的温度较低，温度较高且湿度较大的回风气流流经预凝霜装置30时，其内的湿气会在预凝霜装置30上凝华成霜，降低了吹到蒸发器20的空气湿度，从而减少甚至避免了蒸发器20结霜。当冷冻间室110的温度达到关机点温度后，可关闭电控风门33，启动加热装置，加热装置优选为低功率加热丝，可以将预凝霜装置30上产生的少量结霜融化，结霜融化产生的化霜水滴落在预凝霜装置30下方的接水盘50内，并通过排水孔51排出箱体外。
本领域技术人员应理解，本发明的冰箱1不但包括普通意义上的冰箱，还可包括其他具有类似于冰箱功能的冷藏冷冻装置，例如，冰柜、冷柜、冷藏箱等。
本领域技术人员还应理解，本发明实施例中所称的“横”、“纵”、“竖”、“前”、“后”等用于表示方位或位置关系的用语是以冰箱1的实际使用状态为基准而言的，这些用语仅是为了便于描述和理解本发明的技术方案，而不是指示或暗示所指的装置或部件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
至此，本领域技术人员应认识到，虽然本文已详尽示出和描述了本发明的多个示例性实施例，但是，在不脱离本发明精神和范围的情况下，仍可根 据本发明公开的内容直接确定或推导出符合本发明原理的许多其他变型或修改。因此，本发明的范围应被理解和认定为覆盖了所有这些其他变型或修改。

Claims (10)

  1. 一种冰箱，包括箱体，所述箱体内限定有用于储存物品的冷冻间室、容置有蒸发器的蒸发器室、以及连接在所述蒸发器室与所述冷冻间室之间以供所述冷冻间室内的回风气流返回所述蒸发器室的回风风道；其中
    所述回风风道设有允许气流穿过的预凝霜装置，以使得所述回风气流流经所述预凝霜装置后再返回所述蒸发器室；且
    所述箱体内还限定有用于将经所述蒸发器换热后的部分冷却气流引流至所述预凝霜装置的引风通道，以对所述预凝霜装置进行降温，从而在所述回风气流流经所述预凝霜装置时使得所述回风气流中的湿气在所述预凝霜装置上凝结成霜。
  2. 根据权利要求1所述的冰箱，其中
    所述预凝霜装置的内部设有加热装置，所述加热装置配置成在所述冷冻间室处于非制冷状态时受控地启动，以对所述预凝霜装置进行加热，从而促使所述预凝霜装置上凝结的霜融化。
  3. 根据权利要求2所述的冰箱，其中
    所述预凝霜装置包括用于供所述回风气流流入其中的回风气流入口，所述回风气流入口处设有电控风门，所述电控风门配置成在所述冷冻间室处于非制冷状态、且所述加热装置启动之前受控地关闭所述回风气流入口。
  4. 根据权利要求2所述的冰箱，其中
    所述预凝霜装置的下方设有接水盘，以用于承接所述预凝霜装置化霜产生的化霜水；且
    所述接水盘的底部具有排水口，以用于将所述接水盘内承接的化霜水排放至所述箱体外部。
  5. 根据权利要求2所述的冰箱，其中
    所述预凝霜装置包括蜂窝状的导热本体，所述导热本体内开设有沿所述回风气流的气流流动方向延伸且间隔排布的多个蜂窝孔，以供所述回风气流流过。
  6. 根据权利要求5所述的冰箱，其中
    所述蜂窝孔设置成沿所述回风气流的流动方向倾斜向下延伸或倾斜向上延伸。
  7. 根据权利要求5所述的冰箱，其中
    所述加热装置包括若干个加热丝，每个所述加热丝均沿所述蜂窝孔的延伸方向穿过相邻两个所述蜂窝孔并回形地缠绕在相邻两个所述蜂窝孔之间。
  8. 根据权利要求5所述的冰箱，其中
    所述导热本体内还开设有间隔排布且与所述蜂窝孔流体隔离的多个导流孔，所述引风通道的气流出口与所述导流孔连通，以使得从所述引风通道流出的冷却气流流向所述导流孔，从而对所述预凝霜装置进行降温。
  9. 根据权利要求5所述的冰箱，其中
    所述蜂窝孔的孔壁为具有若干凸起或凹坑的曲面。
  10. 根据权利要求1所述的冰箱，其中
    所述回风风道包括开设在所述冷冻间室的内胆壁上的回风口，所述预凝霜装置设置在所述回风口处。
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