Patent Description:
With the technical progress and the improvement of the living standard of people, requirements of users for refrigerators are higher and higher. A traditional refrigerator having only a refrigerating chamber, a freezing chamber and a variable temperature chamber fails to meet the demand of the users for diversification of a storage space.

In recent years, a composite door technology appears in the field of refrigerators. As is well known, a traditional refrigerator door is used for opening and closing a refrigerating compartment of a refrigerator body, and at most, a bottle holder is provided at a liner of a refrigerating door for holding a bottled object. The refrigerator with the composite door improves the structure and the function of the door, such that the door includes a primary door and a secondary door, and the primary door is used for opening and closing the refrigerating compartment. The primary door defines a door compartment having an open front side, and the secondary door is used for opening and closing the door compartment. In a rotation process of the primary door, the secondary door is kept in a closed state. The door compartment can be used for placing storage objects, only the secondary door is required to be opened when the storage objects are taken and placed, without opening the primary door.

The composite door structure of the refrigerator facilitates classified storage of the storage objects and door opening and closing operations of a user, but an actual product still has some problems; for example, the secondary door is opened too frequently, such that the cold loss of the door compartment is large; inner walls of the door compartment are prone to condensation, and these problems hinder a further development of the composite door technology.

<CIT> discloses a refrigerator according to the preamble of claim <NUM>, including a lighting device that is configured to illuminate an inner space of the storage chamber so that the inner space of the second storage chamber is viewable through the hole and from outside the refrigerator based on an activation state of the lighting device.

<CIT> discloses an integrated control panel for a home appliance. The integrated control panel comprises: at least one panel pivotally connected to a home appliance for allowing access to the inside of said home appliance; a plurality of controls embedded into said at least one panel; and one or more lighting structures embedded into said at least one panel, said one or more lighting structures selectively illuminated to provide substantially uniform illumination of said plurality of controls.

<CIT> discloses a bar counter door for a refrigerator. The bar counter door includes: a base, the inside of which defines a receiving chamber and the front side is open; a transparent member, the transparent member being provided in the receiving chamber; and front cover, the front cover closes the front side of the base, and the front cover is hollow to expose the transparent member.

<CIT> discloses a refrigerator including: a cabinet configured to form a storage space; a main door configured to open and close the storage space and having an opening part communicating with the storage space; a sub door rotationally mounted on the main door to open and close the opening part; a panel assembly disposed in the sub door and having a front surface panel and a rear surface panel which can penetrate an inner side of the opening part from an outer side thereof; and a hydrophilic layer disposed on a surface facing the opening part in the rear surface panel.

An object of the present invention is to overcome at least one of the above-mentioned drawbacks of the prior art and provide a refrigerator which can effectively reduce the frequency of opening a secondary door.

Another object of the present invention is to add the product high-tech element and improve the user experience.

Still another object of the present invention is to reduce condensation on the inner wall of a second compartment of the refrigerator.

In particular, the present invention provides a secondary door for a refrigerator, including:.

Optionally, the state adjustable door panel is configured to be in a transparent state when a human body exists within a preset distance from the front side of the secondary door, and in a non-transparent state when no human body exists in the preset distance from the front side of the secondary door.

Optionally, the second compartment is divided into a plurality of storage regions; the state adjustable door panel includes a plurality of adjusting subregions with independently adjustable transparency, and the adjusting subregions are opposite to the plural storage regions respectively; the state adjustable door panel is configured to switch each adjusting subregion from the non-transparent state to the transparent state when the adjusting subregion is pressed, such that the corresponding storage region is in a visible state.

Optionally, the state adjustable door panel includes a first glass layer, a second glass layer, and a liquid crystal layer therebetween, and the liquid crystal layer is configured to be in a transparent state when in a powered-on state and in a non-transparent state when in a powered-off state.

According to the invention, a rear wall of the primary door is provided with an air supply port and a return air port which are communicated with the first compartment and the second compartment; the rear wall is hollow, a condensation removing air duct communicated with the first compartment is defined in the rear wall, and a plurality of condensation removing holes communicated with the second compartment and the condensation removing air duct are formed in the front surface of the rear wall backwards; the refrigerator is configured to: be in a cooling cycle mode where air in the first compartment enters the second compartment through the air supply port and then returns to the first compartment through the return air port; or in a condensation removing mode where the air in the first compartment enters the condensation removing air duct, so as to allow part of the air flow to flow to the front surface of the rear wall through the condensation removing holes to remove surface condensation of the rear wall.

Optionally, the condensation removing air duct has an inlet and an outlet communicated with the first compartment; the refrigerator is configured to allow the inlet and the outlet to be in a closed state and an open state respectively when in the cooling cycle mode, and to allow both the inlet and the outlet to be in the open state when in the condensation removing mode.

Optionally, the inlet penetrates through a sidewall of the air supply port to be communicated with the air supply port, and the outlet penetrates through a sidewall of the return air port to be communicated with the return air port.

Optionally, the refrigerator further includes a damper mounted at the air supply port and configured to be controllably moved to a cooling state where the inlet is closed and the air supply port is opened, or to a condensation removing state where the inlet is opened and the air supply port is closed.

Optionally, one end of the damper is rotatably mounted at a front edge of the inlet to rotate to the cooling state or the condensation removing state.

Optionally, the arrangement density of the condensation removing holes is gradually decreased in a direction from the air supply port to the return air port.

In the refrigerator the secondary door includes the state adjustable door panel, and the transparency of the state adjustable door panel is adjustable, such that the visibility of the internal structure of the second compartment is adjustable. Therefore, when a user needs to know the storage condition of the second compartment, the state adjustable door panel of the refrigerator can be in the transparent state. After observing the storage condition of the second compartment, the user does not open the secondary door if unnecessary, thus avoiding that cold leakage is caused when the secondary door is opened, and also avoiding that due to external air entering the second compartment, the temperature and humidity of the second compartment change to increase a risk of condensation of the inner wall of the second compartment. Furthermore, the transparency of the secondary door is adjustable, such that the overall high-tech element of the refrigerator is full, and the product grade and the user experience are improved.

Further, in the refrigerator when no human body exists in the preset distance from the front side of the secondary door, the state adjustable door panel is in the non-transparent state, such that the internal structure of the second compartment is invisible to avoid influences of the internal structure on the appearance of the refrigerator. When a human body exists in the preset distance from the front side of the secondary door, the refrigerator presumes that the user has the possibility of opening the door, and the state adjustable door panel is switched to the transparent state, such that the internal structure of the second compartment is visible, and the storage condition thereof is shown to the user, so as to avoid an unnecessary door opening operation. Therefore, with the refrigerator according to the present invention, the storage condition of the second compartment can be obtained without opening the secondary door, and the appearance of the refrigerator is prevented from being adversely affected.

Further, in the refrigerator the structure of the state adjustable door panel is further refined, such that the state adjustable door panel includes the plurality of adjusting subregions with the independently adjustable transparency, the adjusting subregions are opposite to the plurality of storage regions of the second compartment respectively, and when each adjusting subregion is pressed, the adjusting subregion is switched from the non-transparent state to the transparent state, such that the corresponding storage region is in a visible state. Therefore, the transparency of the state adjustable door panel can be directly and manually switched by the user, and the plurality of adjusting subregions are divided for the user to select, thus improving the operation experience of the user.

Further, in the present invention, the condensation on the inner wall of the second compartment can be effectively removed by specially designing the primary door. Specifically, in the present invention, the rear wall of the primary door is hollow to define the condensation removing air duct, and the front surface of the rear wall is backwards provided with the plurality of condensation removing holes. When the second compartment is required to be refrigerated normally, the refrigerator operates in the cooling cycle mode, such that the air in the first compartment normally enters the second compartment through the air supply port, so as to refrigerate the second compartment. When condensation is generated on the rear wall surface of the second compartment (i.e., the front surface of the rear wall of the primary door) and required to be removed, the refrigerator operates in the condensation removing mode, such that the air in the first compartment enters the condensation removing air duct in the rear wall of the primary door, so as to allow part of the air flow to flow to the front surface of the rear wall through the condensation removing holes. The relative humidity of the air in the condensation removing air duct is certainly lower than that of the original air flow at the front surface of the rear wall of the primary door (the relative humidity of the air near the condensation is certainly high), and therefore, introduction of the low-humidity air in the condensation removing air duct can promote evaporation of the condensation.

In addition, when the refrigerator according to the present invention operates in the condensation removing mode, the traditional modes of electrically heating the rear wall or introducing hot air, or the like, are not adopted, and condensation removal is carried out utilizing the cold air of the first compartment, such that the normal refrigeration of the second compartment is basically not influenced in the condensation removing process, and the structural design is ingenious.

According to the following detailed description of specific embodiments of the present invention in conjunction with drawings, those skilled in the art will better understand the aforementioned and other objects, advantages and features of the present invention.

Some specific embodiments of the present invention will be described below in detail in an exemplary rather than restrictive manner with reference to the drawings. Identical reference numerals in the drawings represent identical or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:.

A refrigerator according to an embodiment of the present invention is described below with reference to <FIG>. Directions or positional relationships indicated by terms "front", "rear", "upper", "lower", "top", "bottom", "inner", "outer", "transverse" etc. are based on orientations or positional relationships shown in the drawings, and they are used only for describing the present invention and for description simplicity, but do not indicate or imply that an indicated device or element must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

<FIG> is a schematic principle diagram of a refrigerator according to an embodiment of the present invention; <FIG> is a schematic structural diagram of a secondary door in an embodiment of the present invention; <FIG> is a schematic sectional diagram of a state adjustable door panel in an embodiment of the present invention; <FIG> is a schematic structural diagram of a secondary door in another embodiment of the present invention; and <FIG> is a schematic diagram of a refrigerator in a cooling cycle mode according to an embodiment of the present invention.

As shown in <FIG>, the refrigerator according to the embodiment of the present invention may generally include a refrigerator body <NUM>, a primary door <NUM> and a secondary door <NUM>. The refrigerator body <NUM> has an open front side to define a first compartment <NUM>. The primary door <NUM> is mounted to the refrigerator body <NUM> and used for opening/closing the first compartment <NUM>, and the primary door <NUM> defines a second compartment <NUM> having an open front side. The secondary door <NUM> is mounted to the primary door <NUM> and used for opening/closing the second compartment <NUM>.

The inventor finds that, since a user has difficulty in clearly memorizing specific storage positions of storage objects in the refrigerator, the user tends to open doors one by one when the user wants to take out some storage objects. The refrigerator with a composite door structure is additionally provided with the secondary door <NUM> outside the primary door <NUM>, such that storage positions of the refrigerator are more, doors are more, and total door opening times are further increased, thus causing serious cold loss and other problems. In the embodiment of the present invention, as shown in <FIG>, the secondary door <NUM> includes a state adjustable door panel <NUM>. The state adjustable door panel <NUM> may be mounted on a door frame <NUM>, and the door frame <NUM> is used for being mounted to the primary door <NUM>. The state adjustable door panel <NUM> is configured to controllably change transparency thereof, such that the visibility of an internal structure of the second compartment <NUM> is adjustable. Therefore, when the user needs to know the storage object stored in the second compartment <NUM>, the state adjustable door panel <NUM> of the refrigerator can be made to be in a transparent state. After observing the storage condition of the second compartment <NUM>, the user does not open the secondary door <NUM> if unnecessary, thus avoiding that cold leakage is caused when the secondary door <NUM> is opened, and also avoiding that due to external air entering the second compartment <NUM>, the temperature and humidity of the second compartment change to increase a risk of condensation of the inner wall of the second compartment <NUM>. The transparency of the secondary door <NUM> is adjustable, such that the overall high-tech element of the refrigerator is full, and the product grade and the user experience are improved.

In some embodiments, transparency adjustment of the state adjustable door panel <NUM> includes adjustment to a transparent state and a non-transparent state. As shown in <FIG>, the state adjustable door panel <NUM> includes a first glass layer <NUM>, a second glass layer <NUM>, and a liquid crystal layer <NUM> therebetween, and the liquid crystal layer <NUM> is configured to be in a transparent state when in a powered-on state and in a non-transparent state when in a powered-off state. The liquid crystal layer <NUM> includes polymer dispersed liquid crystals (PDLCs) formed by dispersing small droplets of liquid crystals in the order of micrometers in an organic solid polymer matrix, and since the optical axes of the small droplets formed by liquid crystal molecules are in a free orientation, the refractive index thereof is not matched with that of the matrix, and light is strongly scattered by the droplets when passing through the matrix, such that an opaque milky white state or a translucent state is shown. Application of an electric field can adjust the orientation of the optical axes of the liquid crystal droplets, and when the refractive indexes are matched with each other, the overall liquid crystal layer <NUM> assumes a transparent state. After the electric field is removed, the liquid crystal droplets restore the original light scattering state, such that the overall liquid crystal layer <NUM> assumes a non-transparent state.

In some alternative embodiments, the transparency adjustment of the state adjustable door panel <NUM> may also include adjustment to a transparent state, a non-transparent state, and a translucent state.

In some embodiments, the state adjustable door panel <NUM> is configured to be in a transparent state when a human body exists within a preset distance from the front side of the secondary door <NUM>. The state adjustable door panel is configured to be in a non-transparent state when no human body exists in the preset distance from the front side of the secondary door <NUM>. Specifically, the refrigerator may include a controller and an infrared sensor, the infrared sensor senses the human body, and the controller receives a sensing signal of the infrared sensor and controls switching of the state of the state adjustable door panel <NUM>.

When the refrigerator is in a normal operation state, that is, when there is no human body within the preset distance from the front side of the secondary door <NUM>, the internal structure of the second compartment <NUM> is invisible to prevent the internal structure from affecting the appearance of the refrigerator. When a human body exists in the preset distance from the front side of the secondary door <NUM>, the refrigerator presumes that the user has the possibility of opening the door, and the state adjustable door panel <NUM> is switched to the transparent state, such that the internal structure of the second compartment <NUM> is visible, and the storage condition thereof is shown to the user, so as to avoid an unnecessary door opening operation. According to a general operation habit, when the user is within <NUM> or less from the front side of the refrigerator, the possibility of opening the door is high, and thus, the preset distance may be set to a value less than <NUM>. Thus, with the refrigerator according to the present invention, the storage condition of the second compartment <NUM> can be obtained without opening the secondary door <NUM>, and the appearance of the refrigerator is prevented from being adversely affected.

In other embodiments, as shown in <FIG>, the second compartment <NUM> may be divided into a plurality of storage regions; for example, a plurality of shelves may be provided, and the space above each shelf forms one storage region. The state adjustable door panel <NUM> includes a plurality of adjusting subregions <NUM>, <NUM>, <NUM> with independently adjustable transparency. The plurality of adjusting subregions <NUM>, <NUM>, <NUM> face the plurality of storage regions respectively. The state adjustable door panel is configured to switch each adjusting subregion from the non-transparent state to the transparent state when the adjusting subregion is pressed, such that the corresponding storage region is in a visible state. Thus, the user can selectively observe the storage condition of some storage regions of the second compartment. The transparency switching of the state adjustable door panel <NUM> is operated by the user, thereby improving the operation experience of the user.

In some embodiments, the primary door <NUM> may be rotatably mounted to the refrigerator body <NUM> at the front side of the refrigerator body <NUM>, the primary door <NUM> has an open front side to define the aforementioned second compartment <NUM>, and the secondary door <NUM> may be rotatably mounted to the primary door <NUM> at the front side of the primary door <NUM>. When the primary door <NUM> is opened, the user can access items from the first compartment <NUM>. When the primary door <NUM> is closed and the secondary door <NUM> is opened, the user can access items from the second compartment <NUM>.

The refrigerator may be refrigerated by a vapor compression refrigeration cycle system, a semiconductor refrigeration system, or other means. Compartments inside the refrigerator may include a refrigerating chamber, a freezing chamber, and a variable temperature chamber according to a refrigerating temperature. For example, the temperature in the refrigerating chamber is generally controlled between <NUM> and <NUM>, preferably between <NUM> and <NUM>. The temperature range in the freezing chamber is generally controlled between -<NUM> and -<NUM>. The variable temperature chamber can be adjusted between -<NUM> and <NUM> to achieve a variable temperature effect. The optimal storage temperatures of different kinds of items are different, and the storage compartments suitable for storage are also different. For example, fruit and vegetable foods are suitable for being stored in the refrigerating chamber, while meat foods are suitable for being stored in the freezing chamber. The first compartment <NUM> in the embodiment of the present invention is preferably the refrigerator chamber.

In the existing refrigerator with a composite door, the condensation problem of the inner wall of a compartment defined by the door is serious. The inventor recognizes that since a rear wall <NUM> of the primary door <NUM> is close to the first compartment <NUM> and can exchange heat with the air in the first compartment <NUM> by heat conduction, the temperature of the front surface of the rear wall <NUM> is lower than that of other wall surfaces of the second compartment <NUM>, and condensation is more likely to occur thereon.

Based on the above recognition, in the embodiment of the present invention, the condensation on the front surface of the rear wall <NUM> of the second compartment <NUM> is purposely removed by specially designing the primary door <NUM>.

<FIG> is an enlarged view at A of <FIG>; <FIG> is a schematic state diagram of the refrigerator shown in <FIG> in a condensation removing mode; and <FIG> is an enlarged view at B of <FIG>.

As shown in <FIG>, the rear wall <NUM> of the primary door <NUM> is provided with an air supply port <NUM> and a return air port <NUM> which are communicated with the first compartment <NUM> and the second compartment <NUM>. The rear wall <NUM> of the primary door <NUM> is hollow, and a condensation removing air duct <NUM> communicated with the first compartment <NUM> is defined in the rear wall. That is, the hollow space of the rear wall <NUM> forms the condensation removing air duct <NUM>. A plurality of condensation removing holes <NUM> communicated with the second compartment <NUM> and the condensation removing air duct <NUM> are formed in the front surface of the rear wall <NUM> backwards. The refrigerator is configured to: be in a cooling cycle mode where air in the first compartment <NUM> enters the second compartment <NUM> through the air supply port <NUM> and then returns to the first compartment <NUM> through the return air port <NUM>, so as to refrigerate the second compartment <NUM> using the cold air of the first compartment <NUM>, as shown in <FIG> and <FIG>. Or, the refrigerator is in a condensation removing mode where the air in the first compartment <NUM> enters the condensation removing air duct <NUM> to allow part of the air flow to flow to the front surface of the rear wall <NUM> through the condensation removing holes <NUM>, so as to remove surface condensation thereof, as shown in <FIG> and <FIG>.

In the embodiment of the present invention, the refrigerator is in the cooling cycle mode in a normal state. However, when more condensation occurs on the front surface of the rear wall <NUM> of the primary door <NUM> after humid air is introduced by door opening and closing operations or a high-humidity storage object is placed, the refrigerator may be controlled to operate in the above-described condensation removing mode, such that the air in the first compartment <NUM> enters the condensation removing air duct <NUM> inside the rear wall <NUM> of the primary door <NUM>, so as to allow part of the air flow to flow to the front surface of the rear wall <NUM> through the condensation removing holes <NUM>. Since the relative humidity of the air in the condensation removing air duct <NUM> is certainly lower than that of the original air flow at the front surface of the rear wall <NUM> of the primary door <NUM> (the relative humidity of the air near the condensation is certainly high), and therefore, introduction of the low-humidity air in the condensation removing air duct <NUM> can promote evaporation of the condensation to complete the condensation removing process. When condensation removal is completed, the refrigerator can be controlled to be switched to the cooling cycle mode.

The switching time of the cooling cycle mode and the condensation removing mode can be automatically controlled by the refrigerator, such as timing switching or automatic switching of the refrigerator operation mode according to a detection result of a humidity sensor. The switching can also be controlled manually; for example, the refrigerator operation mode can be switched manually when the user finds that condensation removal is required or needs to be stopped.

When the refrigerator according to the embodiment of the present invention operates in the condensation removing mode, the traditional modes of electrically heating the rear wall <NUM> or introducing hot air, or the like, are not adopted, and condensation removal is carried out still utilizing the cold air of the first compartment <NUM>, such that the normal refrigeration of the second compartment <NUM> is basically not influenced in the condensation removing process, and the structural design is ingenious.

In some embodiments, as shown in <FIG> and <FIG>, the condensation removing air duct <NUM> may have an inlet <NUM> and an outlet <NUM> communicated with the first compartment <NUM>, so as to form air path circulation between the condensation removing air duct <NUM> and the first compartment <NUM> to avoid that the air flow for condensation removal is accumulated near the condensation removing air duct <NUM> and the condensation removing holes <NUM>, cannot circulate, and thus affects the condensation removing effect. Furthermore, the refrigerator is further configured to allow the inlet <NUM> and the outlet <NUM> to be in a closed state and an open state respectively when in the cooling cycle mode, and to allow both the inlet <NUM> and the outlet <NUM> to be in the open state when in the condensation removing mode. That is, only the inlet <NUM> of the condensation removing air duct <NUM> is required to be closed in the cooling cycle mode. In the condensation removing mode, the inlet <NUM> of the condensation removing air duct <NUM> is opened. Since opening and closing of the condensation removing air duct <NUM> are controlled by controlling opening and closing of the inlet <NUM> and the outlet <NUM> of the condensation removing air duct <NUM>, the outlet <NUM> of the condensation removing air duct <NUM> is not required to be controlled. In the two modes, the outlet <NUM> of the condensation removing air duct <NUM> is in a normally open state and is not required to be controlled, so as to simplify the structure and control of the refrigerator.

In some embodiments, as shown in <FIG> and <FIG>, the inlet <NUM> of the condensation removing air duct <NUM> may penetrate through the sidewall of the air supply port <NUM> to be communicated with the air supply port <NUM>. That is, the condensation removing air duct <NUM> is communicated with the first compartment <NUM> through the air supply port <NUM>, and no additional opening is required to be formed in the rear wall <NUM>. The outlet <NUM> of the condensation removing air duct <NUM> may also penetrate through the sidewall of the return air port <NUM> to be communicated with the return air port <NUM>. That is, the condensation removing air duct <NUM> is communicated with the first compartment <NUM> through the return air port <NUM>, and no additional opening is required to be formed in the rear wall <NUM>. Such a design structure is quite ingenious, the opening structure of the rear wall <NUM> of the primary door <NUM> is simplified, and the rear surface of the rear wall <NUM> of the primary door <NUM> is only required to be directly provided with the air supply port <NUM> and the return air port <NUM>.

In some embodiments, as shown in <FIG> and <FIG>, the air supply port <NUM> and the return air port <NUM> are located at the top and bottom of the rear wall <NUM> respectively. When the refrigerator is in the cooling cycle mode, after the cold air flows into the second compartment <NUM> from the air supply port <NUM>, the cold air flows downwards to sequentially refrigerate regions at height levels of the second compartment <NUM> due to a sinking effect caused by relatively high density of the cold air, and after the temperature of the air is gradually increased, the air flows back to the first compartment <NUM> from the return air port <NUM> at the bottom of the second compartment <NUM>. Thus, smoother air path circulation is formed to improve the refrigerating effect of the second compartment <NUM>. When the refrigerator is in the condensation removing mode, the cold air enters the condensation removing air duct <NUM> from the top of the condensation removing air duct <NUM>, and can better flow downwards, such that the condensation removing air duct <NUM> has a better circulation performance which is favorable for accelerating the condensation removing process.

As shown in <FIG> and <FIG>, the refrigerator may further include a damper <NUM> mounted at the air supply port <NUM> and configured to be controllably moved to a cooling state (like <FIG>) where the inlet <NUM> is closed and the air supply port <NUM> is opened, or to a condensation removing state (like <FIG>) where the inlet <NUM> is opened and the air supply port <NUM> is closed. In the present embodiment, the advantage that the inlet <NUM> is communicated with the air supply port <NUM> is effectively utilized, and one damper <NUM> is used to simultaneously control the air supply port <NUM> and the inlet <NUM>, thereby simplifying the air inlet and outlet control and having an ingenious design.

Specifically, as shown in <FIG> and <FIG>, one end of the damper <NUM> may be rotatably mounted at the front edge of the inlet <NUM> to rotate to the cooling state (like <FIG>) or the condensation removing state (like <FIG>). In the embodiment of the present invention, the switching of the refrigerator operation mode can be completed by controlling the rotation of one damper <NUM> without providing a complex motion mechanism and control logic, and the structure and control are greatly simplified.

In some embodiments, as shown in <FIG>, the refrigerator further includes a fan <NUM>, and the fan <NUM> is located at the air supply port <NUM> and used for forcing the air of the first compartment <NUM> to flow to the air supply port <NUM> to increase a cooling circulation speed. Certainly, for the solution where the inlet <NUM> is communicated with the air supply port <NUM>, the fan <NUM> is also used to force the air in the first compartment <NUM> to flow to the condensation removing air duct <NUM>.

Claim 1:
A refrigerator, comprising:
a refrigerator body (<NUM>) having an open front side to define a first compartment (<NUM>);
a primary door (<NUM>) mounted to the refrigerator body (<NUM>) and used for opening/closing the first compartment (<NUM>), the primary door (<NUM>) defining a second compartment (<NUM>) having an open front side; and
a secondary door (<NUM>) mounted to the primary door (<NUM>) and used for opening/closing the second compartment (<NUM>), the secondary door (<NUM>) comprising a state adjustable door panel (<NUM>), and the state adjustable door panel (<NUM>) being configured to controllably change transparency such that the visibility of an internal structure of the second compartment (<NUM>) is adjustable;
characterized in that
a rear wall (<NUM>) of the primary door (<NUM>) is provided with an air supply port (<NUM>) and a return air port (<NUM>) which are communicated with the first compartment (<NUM>) and the second compartment (<NUM>); the rear wall (<NUM>) is hollow, a condensation removing air duct (<NUM>) communicated with the first compartment (<NUM>) is defined in the rear wall (<NUM>), and a plurality of condensation removing holes (<NUM>) communicated with the second compartment (<NUM>) and the condensation removing air duct (<NUM>) are formed in the front surface of the rear wall (<NUM>) backwards; the refrigerator is configured to:
be in a cooling cycle mode where air in the first compartment (<NUM>) enters the second compartment (<NUM>) through the air supply port (<NUM>) and then returns to the first compartment (<NUM>) through the return air port (<NUM>); or
in a condensation removing mode where the air in the first compartment (<NUM>) enters the condensation removing air duct (<NUM>), so as to allow part of the air flow to flow to the front surface of the rear wall (<NUM>) through the condensation removing holes (<NUM>) to remove surface condensation of the rear wall (<NUM>).