CN108362066B - Fan shielding device and refrigerator - Google Patents

Abstract

The invention discloses a fan shielding device for a refrigerator. The refrigerator includes: a box body, the box body defines a target refrigeration compartment, and an air duct leading to the compartment is arranged at the rear of the target refrigeration compartment; The evaporator is arranged at the bottom of the box body; the evaporator is arranged in the evaporator cavity of the box body, and the evaporator can provide cooling capacity for the target refrigeration compartment; the fan is arranged in the fan cavity above the evaporator, It is used to introduce the cold air from the evaporator into the air duct; the fan includes blades and a drive shaft that drives the blades to rotate, the fan shielding device includes a fan cover that covers the periphery of the blades, and the drive shaft is provided with threads The fan cover cooperates with the threaded section, the fan is closed, and the fan cover disconnects the communication between the evaporator chamber and the air duct; the fan is turned on, and the fan cover is driven by the threaded section along the drive shaft. Axial movement to allow the evaporator cavity to communicate with the air duct through the fan cavity.

Description

Fan shielding device and refrigerator

technical field

The invention relates to the field of household appliances, in particular to a fan shielding device and a refrigerator.

Background technique

In the prior art, refrigerators generally refer to single-door, double-door double-temperature, three-door three-temperature, cabinet-type multi-door refrigerators, etc., and generally have an independent freezer compartment and an outer door of the freezer compartment, so as to be separated according to different storage temperatures. store. The refrigeration principle of this refrigerated freezer is divided into direct cooling and air cooling. In the direct-cooling refrigeration system, solenoid valves are often used to control the flow of the refrigerant, and the refrigerant is supplied to the evaporators of each refrigerating (freezing) compartment, so that each space is cooled to the required temperature. Air-cooled refrigeration requires corresponding air ducts to supply air to each space.

Due to the high efficiency and frost-free advantages of air-cooled refrigerators, more and more users are beginning to use air-cooled refrigerators at this stage. After a frost-free refrigerator is used for a period of time, the surface of the evaporator will be frosted, and the frost will gradually thicken, causing the air in the refrigerator to be unsmooth and the cooling effect to deteriorate. At this time, the refrigeration system needs to be stopped and the heater arranged on the evaporator is used to Defrosting, during the defrosting process of the refrigerator, the temperature of the items in the storage room rises because of the inability to perform refrigeration and the influence of the heating wire. At this time, it not only affects the use of the refrigerator, but also in the long run, the alternation of temperature will affect the items in the storage room. storage life.

During the use of the refrigerator, because the air in the storage compartment and the placed items contain moisture, the air in the compartment is in the process of heat exchange with the refrigerator evaporator, and the moisture condenses on the surface of the evaporator. The temperature of the surface is usually lower than zero, and it is too late for the condensed water that falls off the surface of the evaporator to condense into ice (frost). At the same time increase power consumption. At this time, defrosting is required. There are three existing defrosting methods: 1. Natural defrosting; unplug the power supply, open the door of the refrigerator, and let the temperature of the storage room and the outside temperature naturally balance, so as to achieve the purpose of defrosting . Disadvantages; long time, the refrigerator cannot be used when defrosting. 2. Warming and defrosting; heat sources are arranged around the evaporator to achieve the purpose of defrosting. Disadvantages: consumes other energy and has a certain impact on the items in the storage room. 3. Shovel and defrost; unplug the power supply, and use a plastic flat shovel to remove the frost block in the freezer wall to defrost. Disadvantages; there is a risk of damage to the device, the refrigerator cannot be used when defrosting.

At present, the refrigerating evaporator and the refrigerating space in the dual-system refrigerating and freezing refrigerator are always connected through the air duct, so that the refrigerating temperature fluctuates greatly. The existing refrigerating micro-channel technology uses the motor to control the turntable to supply air to the corresponding air outlet of the refrigerating machine. The use of motor drive not only consumes electricity The amount of electricity is large, and the cost of applying the motor itself is high; the motor will generate noise during the rotation process, which runs counter to the low noise required by the refrigerator.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a fan shielding device, which can separate the evaporator from the refrigerating space during defrosting, the fan shielding device has low cost and can save the space of the refrigerator.

In order to achieve the above object of the invention, the present invention provides a fan shielding device for a refrigerator, the refrigerator includes: a box body, the box body defines a target refrigeration compartment, and a rear part of the target refrigeration compartment is provided with a fan leading to the compartment. The compressor is arranged at the bottom of the box body; the evaporator is arranged in the evaporator cavity of the box body, and the evaporator can provide cooling capacity to the target refrigeration compartment; the fan is the fan arranged above the evaporator The cavity is used to introduce the cold air from the evaporator into the air duct; the fan includes blades and a drive shaft that drives the blades to rotate, and the fan shielding device includes a fan cover arranged on the periphery of the blades. A threaded section is provided on the shaft, the fan cover is matched with the threaded section, the fan is closed, and the fan cover disconnects the communication between the evaporator chamber and the air duct; the fan is turned on, the fan The cover is moved axially along the drive shaft by the threaded section to allow the evaporator chamber to communicate with the air duct through the fan chamber.

As a further improvement of an embodiment of the present invention, the drive shaft is arranged at an angle relative to the horizontal position, the fan is turned off, and the fan cover can be reset along the threaded section under the action of gravity.

As a further improvement of an embodiment of the present invention, the included angle of the drive shaft relative to the horizontal position is between 20 degrees and 40 degrees.

As a further improvement of an embodiment of the present invention, the included angle of the drive shaft relative to the horizontal position is 35 degrees.

As a further improvement of an embodiment of the present invention, the target refrigeration compartment is configured as a freezer compartment, and the fan shielding device is arranged at the rear of the freezer compartment.

As a further improvement of an embodiment of the present invention, the drive shaft is arranged in parallel with respect to the horizontal position, the fan stops rotating and then reverses for a preset time, and the fan cover can follow the rotation of the fan along the The thread segments are reset.

As a further improvement of an embodiment of the present invention, the preset time is 0.5 seconds to 2 seconds.

As a further improvement of an embodiment of the present invention, the preset time is 1 second.

As a further improvement of an embodiment of the present invention, the fan chamber is communicated with the air duct, and the fan cover is used to disconnect or allow the communication between the fan chamber and the evaporator chamber.

The present invention also relates to a refrigerator, which includes the fan shielding device described in any one of the above embodiments.

Compared with the prior art, the beneficial effect of the present invention is that: by setting the fan shielding device in the present invention, when the evaporator is defrosted, the evaporator cavity is disconnected from the air duct leading to the refrigeration compartment, and the air passage of the refrigeration compartment is not affected. The temperature has an impact, which is conducive to the stability of the temperature of the refrigeration space and reduces the influence of the heating wire on the refrigeration space during the defrosting process of the air-cooled refrigerator. The power consumption of the fan shielding device is low in the process of opening and closing; and the fan shielding device itself does not need a separate motor drive, which saves space and reduces the production cost of the fan shielding device.

Description of drawings

1 is a schematic cross-sectional rear view of a refrigerator in a preferred first embodiment of the present invention, where the evaporator chamber is disconnected from the air duct;

Fig. 2 is similar to Fig. 1, at this time, the evaporator chamber is communicated with the air duct through the fan chamber;

3 is a schematic cross-sectional rear view of the refrigerator in the preferred second embodiment of the present invention, at this time, the evaporator chamber is disconnected from the air duct;

Fig. 4 is similar to Fig. 3, in this case, the evaporator chamber communicates with the air duct through the fan chamber.

Detailed ways

The present invention will be described in detail below with reference to the specific embodiments described in the accompanying drawings. However, these embodiments do not limit the present invention, and structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the protection scope of the present invention.

As shown in FIG. 1 and FIG. 2 , the preferred first embodiment of the present invention discloses a refrigerator. The refrigerator includes a box body, and the box body defines at least one refrigeration compartment. In this embodiment, the refrigeration The compartment is the freezer compartment 20 as an example for illustration. The refrigerator also has an evaporator (not shown) and a fan 40. The evaporator is arranged in the evaporator cavity at the rear of the freezer compartment of the box body, and the fan 40 is arranged in the fan cavity 41. The fan chamber 41 is located at the upper part of the evaporator chamber and can communicate with the evaporator chamber. The evaporator may be any known evaporator, such as one of a fin evaporator, a wire tube evaporator, a blow-up evaporator, and a plate and tube evaporator. In this embodiment, the refrigerator constitutes a compression refrigeration cycle system through a compressor (not shown), a condenser (not shown) and an evaporator, and the fan 40 introduces the cold air from the evaporator through the air duct 21 at the rear of the freezer compartment 20 The freezing chamber 20, that is, the fan 40 and the circulating air duct leading to the freezing chamber 20 constitute a cold air circulation system. Of course, the refrigerator may also include other refrigerating compartments such as a refrigerating room and a changing room. During operation, the compressor pushes the refrigerant to circulate, the refrigerant entering the evaporator absorbs heat and evaporates, and the fan 40 is sent to the corresponding refrigerating compartment through the circulating air duct. Generally, the compressor is arranged at the bottom of the box body, and the evaporator is arranged in the evaporator cavity at the rear of the freezer compartment of the box body to provide cooling capacity for the refrigerating compartment and the freezer compartment. The lower part of the evaporator is provided with a defrost (not shown), and the compressor is provided on the rear side of the bottom of the refrigerator. The refrigerator compartment and the freezer compartment are arranged from top to bottom, that is, the direction in which the refrigerator compartment and the freezer compartment are arranged from top to bottom is defined as the height direction of the refrigerator. The direction, perpendicular to the height direction and the front-to-rear direction is defined as the width direction of the refrigerator.

In this embodiment, the refrigerator further includes a fan shielding device that cooperates with the fan 40 . The fan 40 includes blades 42 and a drive shaft 43 that drives the blades 42 to rotate. There is a threaded section 431 on it, and the fan cover 50 cooperates with the threaded section 431. As shown in FIG. 1, the fan 40 is turned off, and the fan cover 50 disconnects the communication between the evaporator chamber and the air duct 21, that is, the fan cover 50 is in the first position. position; as shown in FIG. 2 , the fan 40 is turned on, and the fan cover 50 moves axially along the drive shaft under the driving wind of the threaded section 431 to allow the evaporator chamber to communicate with the air duct 21 through the fan chamber 41. At this time, the fan cover 50 In the second position, the cold air from the evaporator can enter the freezer compartment 20 from the air duct 21 along the direction indicated by the arrow under the action of the fan 40 .

Preferably, the drive shaft 43 is set at an angle relative to the horizontal position, the fan 40 is closed, and the fan cover 50 can be reset along the threaded section 431 under the action of gravity, that is, the fan cover 50 returns to disconnect the evaporator chamber and the air duct 21 is disconnected, the fan cover 50 is driven by the fan 40 from the first position where the evaporator chamber is disconnected from the air duct 21 to the second position where the evaporator chamber is allowed to communicate with the air duct 21, from the second position to the second position. The movement of a position occurs under its own gravity. When the fan 40 is turned off, the defrosting of the evaporator can be started. The defrosting device generally uses a heating wire, and the evaporator cavity is disconnected from the air duct 21 to prevent the temperature rise during heating and defrosting from affecting the temperature in the refrigeration compartment. . There are two ways to disconnect the communication here. Disconnecting the communication between the fan chamber 41 and the air duct 21 or disconnecting the communication between the evaporator chamber and the fan chamber 41 can be realized by moving the fan cover. In this embodiment, the included angle of the drive shaft relative to the horizontal position is between 20 degrees and 40 degrees, preferably 35 degrees. In addition, in order to reset the fan cover more reliably, a torsion spring can also be arranged between the drive shaft 43 and the fan cover 50. When the fan 40 stops, the fan cover 50 is easier to reset under the dual action of its own gravity and the elastic force of the torsion spring. .

The above-mentioned fan shielding device does not need to be driven by a motor, and the cooling of the refrigerating compartment is turned on by the start-up control of the fan 40, and the evaporator cavity is disconnected from the air duct leading to the refrigerating compartment when the evaporator is defrosted, so that the cooling of the refrigerating compartment is not affected. The temperature has an impact, which is conducive to the stability of the temperature of the refrigeration space and reduces the influence of the heating wire on the refrigeration space during the defrosting process of the air-cooled refrigerator. The power consumption of the fan shielding device is low in the process of opening and closing; and the fan shielding device itself does not need a separate motor drive, which saves space and reduces the production cost of the fan shielding device.

Referring to FIG. 3 and FIG. 4 , the preferred second embodiment of the present invention, in this preferred embodiment, the fan 40 includes a blade 42 and a drive shaft 43 that drives the blade 42 to rotate. A threaded section 431 is provided on the shaft 43, and the fan cover 50 cooperates with the threaded section 431. As shown in FIG. 3, the fan 40 is turned off, and the fan cover 50 disconnects the communication between the evaporator chamber and the air duct 21, that is, the fan cover 50 is in the position. The first position; as shown in FIG. 4 , the fan 40 is turned on, and the fan cover 50 moves axially along the drive shaft under the driving wind of the threaded section 431 to allow the evaporator chamber to communicate with the air duct 21 through the fan chamber 41. At this time, the fan The cover 50 is in the second position, and the cold air from the evaporator can enter the freezer compartment 20 from the air duct 21 along the direction indicated by the arrow under the action of the fan 40 . In this embodiment, after the fan 40 stops rotating and then reverses for a preset time, the fan cover 50 can be reset along the threaded section under the action of the fan 40 reversing, that is, the fan cover 50 is disconnected from the evaporator chamber and the fan. The movement from the first position where the duct 21 communicates to the second position allowing the evaporator chamber to communicate with the air duct 21 and the movement from the second position to the first position are all driven by the rotation of the fan 40, and the preset time for the reverse rotation of the fan is 0.5 seconds to 2 seconds, preferably 1 second.

The invention solves the opening and closing of the tuyere of the refrigerator by using a safe, reliable, low-cost, low-energy-consumption fan shielding device, separates the evaporator from the refrigeration space, and reduces air circulation during defrosting. Moreover, the fan shielding device provided on the refrigerator can reduce the cost of the refrigerator and reduce the energy consumption of the refrigerator.

It should be understood that although this specification is described in terms of embodiments, not every embodiment only includes an independent technical solution, and this description in the specification is only for the sake of clarity, and those skilled in the art should take the specification as a whole, and each The technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for the feasible embodiments of the present invention, and they are not used to limit the protection scope of the present invention. Changes should all be included within the protection scope of the present invention.

Claims (9)

1. A fan shield apparatus of a refrigerator, the refrigerator comprising:

the refrigerator comprises a box body, a refrigerating chamber and a refrigerating chamber, wherein the box body is limited with a target refrigerating chamber, and an air duct leading to the chamber is arranged at the rear part of the target refrigerating chamber;

the compressor is arranged at the bottom of the box body;

the evaporator is arranged in an evaporator cavity of the box body and can provide cold energy for the target refrigeration chamber;

the fan is arranged in a fan cavity above the evaporator and used for introducing cold air from the evaporator into the air duct;

the method is characterized in that: the fan comprises a blade and a driving shaft driving the blade to rotate, the fan shielding device comprises a fan cover covering the periphery of the blade, a threaded section is arranged on the driving shaft, the fan cover is matched with the threaded section, the fan is closed, and the fan cover cuts off the communication between the evaporator cavity and the air channel; the fan is started, the fan cover moves axially along the driving shaft under the driving of the threaded section to allow the evaporator cavity to be communicated with the air channel through the fan cavity, the driving shaft is arranged at an angle relative to the horizontal position, the fan is closed, and the fan cover can reset along the threaded section under the action of gravity.

2. The fan screen of claim 1 wherein the drive shaft is angled between 20 and 40 degrees from horizontal.

3. The fan screen of claim 2 wherein the drive shaft is angled at 35 degrees relative to horizontal.

4. The fan shelter of claim 1, wherein the target refrigeration compartment is configured as a freezer compartment, the fan shelter being disposed at a rear of the freezer compartment.

5. The fan screen of claim 1 wherein the drive shaft is parallel to a horizontal position, wherein the fan is stopped and then reversed for a predetermined time, and wherein the fan guard is repositionable along the threaded section upon reversal of the fan.

6. The fan shelter of claim 5, wherein the predetermined time is 0.5 seconds to 2 seconds.

7. The fan screen of claim 6, wherein the predetermined time is 1 second.

8. The fan screen of claim 1 wherein the fan cavity is in communication with the air duct and the fan guard is configured to disconnect or allow communication between the fan cavity and the evaporator cavity.

9. A refrigerator characterized in that it comprises a fan shelter according to one of claims 1 to 8.

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