Patent Description:
A refrigerator having an ice-making device for making ice using an ice-making tray is widely used. An ice-making device which has a plurality of ice-making trays and may make more ice is proposed to be provided in such a refrigerator (for example, refer to patent document <NUM>). In the refrigerator described in patent document <NUM>, the plurality of ice-making trays are arranged in a depth direction of the refrigerator to avoid an increase in a size of the ice-making device in a width direction of the refrigerator.

<CIT> discloses an ice tray assembly, wherein pieces of ice stored in a plurality of ice trays can be simultaneously discharged by a single motion without interfering with each other. To this end, a plurality of ice trays are vertically provided within a case, a plurality of the ice trays are connected to one another by an interoperating means to be simultaneously rotated and a driving means for rotating a plurality of the ice trays by being connected thereto.

<CIT> discloses a refrigerator which includes a refrigerator main body having a storage chamber, a door coupled to the refrigerator main body to be opened or closed, a cool air supplying device which generates cool air, an ice maker including an ice making tray having ice making cells to produce ice, and a cool air guide member installed in the door, coupled to the ice making tray and having a cool air line that guides the cool air supplied from the cool air supplying device to flow around the ice making tray. The cool air line disposed on the cool air guide member to supply the ice making tray guides the cool air supplied from the cool air supplying device to move along the surrounding of the ice making tray, thereby uniformly cooling down the ice making tray.

<CIT> discloses an ice making machine which includes an upright ice forming plate located above a water tank and having a cooling surface in heat exchange relationship with an evaporator attached thereto, and an ice forming surface to be supplied with water from the water tank by means of a water pump for forming the water into ice cubes. A first water supply conduit is connected to the water pump to supply the water from the water tank toward the ice forming surface of the upright plate when an ice making mode or a washing mode is selected at the ice making machine, and a second water supply conduit is arranged to introduce a portion of the water supplied from the water tank into a space above the evaporator only when the washing mode is selected at the ice making machine.

Further relevant prior art documents are <CIT>, <CIT> and <CIT>.

Compared with one ice-making tray, a plane area of the plurality of ice-making trays in the refrigerator is directly proportional to a number of the ice-making trays, thus lowering a storage rate (i.e., a space utilization rate) of the refrigerator.

In view of this, the existing ice-making device and refrigerator are necessary to be improved to solve the above-mentioned problem.

An object of the present invention is to provide an ice-making device and a refrigerator having the same, which are capable of supplying more ice while suppressing a reduction in a storage rate of the refrigerator.

According to the present invention, more ice can be supplied by means of a plurality of ice-making trays. Furthermore, since the plurality of ice-making trays are arranged up and down, when the ice-making trays are arranged in the refrigerator, an occupied area in a plan view can be reduced as compared with a case where the plurality of ice-making trays are arranged laterally. Since a cover is provided at an upper portion of a lower ice-making tray and configured to guide ice falling from an upper ice-making tray to fall on a side of the lower ice-making tray, even when the plurality of ice-making trays are arranged up and down, the ice from the upper ice-making tray does not interfere with the lower ice-making tray, but may fall into a storage container provided below the ice-making device.

As such, the present invention provides the ice-making device according to claim <NUM> being capable of supplying more ice while suppressing the reduction in the storage rate of a refrigerator.

Further, the ice-making device further comprising a gas supply portion and an air duct, wherein the gas supply portion supplies gas to an upper space of at least one of the ice-making trays, and the air duct is provided on a side of the ice-making tray and connected between the upper space of the ice-making tray supplied with the gas from the gas supply portion and the upper space of another ice-making tray.

In the ice-making device according to the present invention, when gas is supplied to at least one ice-making tray from a gas supply portion including a fan or a gas suction port, the gas may also be supplied to another ice-making tray through an air duct provided on a side of the ice-making tray. Thus, liquid stored in the plurality of ice-making trays can be efficiently cooled with a small number of gas supply portions.

Further, the ice-making tray has a plurality of ice making regions separated by a partition wall, and a slit is provided at the partition wall to allow liquid in the ice making regions to flow into the adjacent ice making regions once a liquid level exceeds a prescribed height.

In the ice-making device according to the present invention, when liquid is supplied to at least one ice making region through a slit provided at a partition wall of the ice-making tray, the liquid can also be supplied to another ice making region while stored in the ice making region.

Further, the ice-making device further comprising a liquid supply port for supplying liquid, wherein the liquid supply port is provided at at least one of the ice making regions of the uppermost ice-making tray, and a hole for dropping liquid is provided in a lower portion of at least one of the ice making regions of the upper ice-making tray other than the ice making region provided with the liquid supply port.

In the ice-making device according to the present invention, since a liquid supply port for supplying liquid is provided in at least one ice making region of the upper ice-making tray, and a hole for dropping liquid is provided in a lower portion of at least one ice making region of the upper ice-making tray other than the ice making region provided with the liquid supply port, the liquid can be efficiently supplied into all ice making regions of the upper and lower ice-making trays without using special power.

The present invention is also directed to a refrigerator according to claim <NUM>.

As such, the refrigerator may supply more ice while suppressing the reduction in the storage rate.

The present invention has the beneficial effect that the ice-making device and the refrigerator having the same according to the present invention are capable of supplying more ice while suppressing the reduction in the storage rate of the refrigerator.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Hereinafter, the embodiment of the present invention will be described in detail based on the accompanying drawings. In addition, a device described below serves as a device for embodying the technical idea of the present invention, and the present invention is not limited to the following content unless otherwise specified. In order to clarify the description, the sizes, positional relationships, or the like, of elements in each drawing may be exaggeratedly shown. In the specification and the accompanying drawings, the up-down direction is shown assuming a refrigerator provided on the floor.

<FIG> is a perspective view of an ice-making device <NUM> according to one embodiment of the present invention. <FIG> is a perspective view of the ice-making device <NUM> shown in <FIG> with a bearing portion <NUM> supporting rotation shafts of ice-making trays 10A, 10B removed. <FIG> is a perspective view of the ice-making device <NUM> shown in <FIG> with a cover <NUM> further removed, the cover <NUM> being configured to guide ice falling from the upper ice-making tray 10A. <FIG> is a perspective view of the ice-making device <NUM> shown in <FIG> with a fan <NUM> and an air duct <NUM> provided on a side of the ice-making trays 10A, 10B further removed. <FIG> is a side view as viewed along arrow A-A in <FIG>. <FIG> is a perspective view of the upper ice-making tray 10A. <FIG> is a perspective view of the lower ice-making tray 10B.

Here, a case where the ice-making device <NUM> is provided in a refrigerator will be described as an example. The ice-making device <NUM> according to claim <NUM> has two ice-making trays 10A, 10B arranged up and down. The ice-making trays 10A, 10B are formed of a resin material having elasticity. The ice-making trays 10A, 10B have a plurality of ice making regions <NUM> separated by partition walls <NUM>. A plurality of pieces of ice having shapes corresponding to shapes of inner surfaces of the ice making regions <NUM> can be made by freezing liquid, such as drinking water, stored in the ice making regions <NUM>.

In the illustrated embodiment of the present invention, two ice-making trays 10A, 10B are provided, but the present invention is not limited thereto, and there may exist three or more ice-making trays provided up and down. In addition, in the present embodiment, the ice-making trays 10A, 10B are provided to be substantially completely overlapped in the up-down direction, but the present invention is not limited thereto. A plurality of ice-making trays can be provided with slight misalignment in a lateral direction in a plan view. In order to suppress an increase in an occupied area in a plan view, preferably, <NUM>% or more, and more preferably, <NUM>% or more, of the ice-making trays arranged up and down are overlapped.

As shown in <FIG>, a liquid supply port <NUM> for supplying liquid to the ice-making tray 10A is provided above the upper ice-making tray 10A. In this case, for example, liquid stored in a container provided in the refrigerator can be supplied from the liquid supply port <NUM> to the ice-making tray 10A, or the liquid supply port <NUM> can be directly connected with a water pipe, or the like. With reference to <FIG>, flow of the liquid supplied from the liquid supply port <NUM> to the upper ice-making tray <NUM> in the ice-making trays 10A, 10B will be briefly described in detail later as follows.

The liquid supplied from the liquid supply port <NUM> to one ice making region <NUM> of the upper ice-making tray 10A flows to the ice making regions <NUM> adjacent in sequence through a slit <NUM> while being stored in the ice making region <NUM>. Further, the liquid flows down to the lower ice-making tray 10B through a hole <NUM> provided in one ice making region <NUM> of the upper ice-making tray 10A. Then, in the lower ice-making tray 10B, the liquid flows to the ice making regions <NUM> adjacent in sequence through a slit <NUM> while being stored in the ice making region <NUM>. Thus, the liquid is stored in each ice making region <NUM> of the ice-making trays 10A, 10B.

A fan <NUM> is provided above the upper ice-making tray 10A and configured to supply gas to an upper space of the ice-making tray 10A. In the present embodiment, the cooled gas passing through an evaporator of the refrigerator is introduced into the ice-making device <NUM> by the fan <NUM> and supplied to the upper space of the ice-making tray 10A. The ice-making device <NUM> has an air duct <NUM> provided on a side of the ice-making trays 10A, 10B and connected between the upper space of the upper ice-making tray 10A and an upper space of the lower ice-making tray 10B. With such a configuration, the cold gas passing through the evaporator of the refrigerator is supplied by the fan <NUM>, and flows through the upper space of the upper ice-making tray 10A and the upper space of the lower ice-making tray 10B. Thus, the liquid stored in the ice-making trays 10A, 10B is frozen and ice is formed. Flow of this gas is described in detail later with reference to <FIG>.

The ice-making device <NUM> further has a rotating mechanism <NUM> for rotating the two ice-making trays 10A, 10B, and a bearing portion <NUM>. Driving shaft portions <NUM> and non-driving shaft portions <NUM> are provided at two ends of the ice-making trays 10A, 10B. The driving shaft portions <NUM> of the ice-making trays 10A, 10B are mounted to holding portions 22A, 22B at an upper portion and a lower portion of the rotating mechanism <NUM> respectively. The holding portions 22A, 22B are rotated by an electric motor provided in the rotating mechanism <NUM>. The non-driving shaft portions <NUM> of the ice-making trays 10A, 10B are inserted into an upper hole and a lower hole of the bearing portion <NUM> respectively.

With such a configuration, the ice-making trays 10A, 10B are rotated about rotation axes Xa, Xb by a driving force of the rotating mechanism <NUM> respectively. At a rotation position of the ice-making trays 10A, 10B, there exists an ice making position where upper surfaces <NUM> of the ice-making trays 10A, 10B face upwards and the liquid can be stored. In consideration of a liquid storage efficiency in the ice making regions <NUM> of the ice-making trays 10A, 10B, preferably, the upper surfaces <NUM> of the ice-making trays 10A, 10B are horizontal, but the upper surfaces <NUM> can be slightly inclined. Further, at the rotation position of the ice-making trays 10A, 10B, there exists an ice release position where the ice formed in the ice making region <NUM> is released and falls. In the ice release position, in order to drop the ice, the upper surface <NUM> is required to become downward, but does not have to be horizontal, and can be inclined downwards.

The upper surfaces <NUM> of the ice-making trays 10A, 10B are rotated towards the upper ice making position by the driving force of the rotating mechanism <NUM>, such that the upper surface <NUM> becomes downward, and projections <NUM> provided at end portions on the non-driving shaft portion <NUM> sides of the ice-making trays 10A, 10B abut against stoppers provided at the bearing portion <NUM>. When the rotating mechanism <NUM> is continuously driven after the abutment, the non-driving shaft portion <NUM> side of the ice-making trays 10A, 10B is substantially stopped from rotating, and the driving shaft portion <NUM> side is continuously rotated. As such, the ice-making trays 10A, 10B made of the elastic material are twisted, and then, the ice is released from each ice making region <NUM> and falls down due to gravity. Therefore, a stop position where the upper surfaces <NUM> of the ice-making trays 10A, 10B are simultaneously twisted downwards is the ice release position.

In the present embodiment, the rotating mechanism <NUM> has one electric motor, and the two ice-making trays 10A, 10B are rotated simultaneously by a gear transmission mechanism. Any known ice release mechanism can be used as a mechanism for rotating and twisting the ice-making trays 10A, 10B to release the ice. A travel way of the ice falling from the ice-making trays 10A, 10B is described in detail later with reference to <FIG>.

As shown in <FIG>, the ice-making trays 10A, 10B are provided with <NUM> rows of <NUM> ice making regions <NUM> (<NUM> ice making regions <NUM> in total) which are separated by the partition wall <NUM>. However, the arrangement of the ice making region <NUM> is not limited thereto. The partition wall <NUM> is provided with the slit <NUM>. The slit <NUM> is provided from a position at a prescribed height h from a bottom surface of the ice making region <NUM> to an upper end of the partition wall <NUM>. Therefore, the liquid in the ice making region <NUM> flows into the adjacent ice making region <NUM> once a liquid level exceeds the prescribed height h. Thus, when supplied to one ice making region <NUM> of the ice-making trays 10A, 10B, the liquid can be stored in each ice making region <NUM> up to the height h.

The liquid supply port <NUM> is provided above one of the two ice making regions <NUM> located at the end portion on the non-driving shaft portion <NUM> side of the upper ice-making tray 10A. The slits <NUM> are provided between two ice making regions <NUM> in adjacent rows located at the end portion on the non-driving shaft portion <NUM> side, and between two ice making regions <NUM> in adjacent rows located at the end portion on the driving shaft portion <NUM> side. Furthermore, the slit <NUM> is provided between the ice making regions <NUM> adjacent in a row direction. Further, the hole <NUM> for dropping the liquid is provided in a lower portion of one of the two ice making regions <NUM> located at the end portion on the driving shaft portion <NUM> side.

With the above arrangement of the slit <NUM> and the hole <NUM>, the liquid supplied from the liquid supply port <NUM> to one ice making region <NUM> at the end portion on the non-driving shaft portion <NUM> side flows from the non-driving shaft portion <NUM> side to the driving shaft portion <NUM> side in two groups (one for each row) as indicated by the dotted arrows in <FIG>, and flows downwards from the hole <NUM> of the one ice making region <NUM> at the end portion on the non-driving shaft portion <NUM> side. Thus, the liquid having the liquid level height h is stored in the ice making regions <NUM> of the upper ice-making tray 10A other than the ice making region <NUM> having the hole <NUM>. By providing the slit only between the ice making regions <NUM> of the adjacent rows at the ice making regions <NUM> of both end portions, the liquid may smoothly flow in two groups (one for each row).

For the lower ice-making tray 10B, the slits <NUM> are provided between two ice making regions <NUM> in adjacent rows located at the end portion on the non-driving shaft portion <NUM> side, and between two ice making regions <NUM> in adjacent rows located at the end portion on the driving shaft portion <NUM> side. Furthermore, the slit <NUM> is provided between the ice making regions <NUM> adjacent in a row direction, and the lower ice-making tray 10B is not provided with the ice making region <NUM> having the hole <NUM>.

With the above arrangement of the slit <NUM>, the liquid flowing from the upper ice-making tray 10A downwards to one ice making region <NUM> at the end portion on the driving shaft portion <NUM> side flows from the driving shaft portion <NUM> side to the non-driving shaft portion <NUM> side in two groups (one for each row) as indicated by the dotted arrows in <FIG>. Thus, the liquid having the liquid level height h is stored in all the ice making regions <NUM> of the lower ice-making tray 10B. In the lower ice-making tray 10B as well, by providing the slit only between the ice making regions <NUM> of the adjacent rows at the ice making regions <NUM> of both end portions, the liquid may smoothly flow in two groups (one for each row).

However, the above arrangement of the slits <NUM> in the ice-making trays 10A, 10B is merely an example, and any other arrangement of the slit <NUM> can be adopted depending on the arrangement of the ice making region <NUM>. Although one hole <NUM> is provided at the upper ice-making tray 10A in the present embodiment, the present invention is not limited thereto, and the holes <NUM> for the liquid to fall can be provided at the lower portions of a plurality of ice making regions <NUM> of the ice-making tray 10A.

In addition, in a case of three or more ice-making trays <NUM> arranged up and down, the liquid supply port <NUM> can be provided to supply liquid to one ice making region <NUM> of the uppermost ice-making tray <NUM>. In addition, the present invention is not limited to the case where the liquid is supplied from the liquid supply port <NUM> to one ice making region <NUM>, and the liquid can be supplied from the liquid supply port <NUM> to a plurality of ice making regions <NUM>. In this case, preferably, the slits <NUM> are provided in accordance with positions of the plurality of liquid supply ports <NUM>, such that the flows of the liquid from the liquid supply ports <NUM> do not interfere with each other.

As above, in the case where the liquid is supplied to at least one ice making region <NUM> through the slit <NUM> provided at the partition wall <NUM> of the ice-making trays 10A, 10B, the liquid can be supplied to another ice making region <NUM> while stored in the ice making region <NUM>.

Further, since there exists the liquid supply port <NUM> for supplying the liquid to at least one ice making region <NUM> of the uppermost ice-making tray 10A, and the hole <NUM> for dropping the liquid is provided in the lower portion of at least one ice making region <NUM> of the upper ice-making tray 10A other than the ice making region <NUM> provided with the liquid supply port <NUM>, the liquid can be efficiently supplied into all the ice making regions <NUM> of the upper and lower ice-making trays 10A, 10B without using special power.

The flow of the gas in the ice-making device <NUM> is explained with reference to <FIG>. In <FIG>, the flow of the gas is indicated by a dot-and-dash arrow. The upper space of the upper ice-making tray 10A is closed at the right end portion in the drawing by a wall <NUM> (refer to <FIG>). Therefore, the gas cooled by the evaporator of the refrigerator and discharged downwards by the fan <NUM> flows from the right side to the left side of the drawing in a lower portion of the fan <NUM> and the upper space of the upper ice-making tray 10A. The liquid stored in each ice making region <NUM> of the ice-making tray 10A is cooled by the flow of the gas discharged downwards. Then, the gas flowing in the lower portion of the fan <NUM> and the upper space of the ice-making tray 10A flows into the air duct <NUM>, and the air duct <NUM> is provided on the side of the ice-making trays 10A, 10B and connected between the upper space of the upper ice-making tray 10A and the upper space of the lower ice-making tray 10B. The air duct <NUM> is provided with a flow path having a curved surface or an inclined surface, such that the gas flows smoothly with less pressure loss.

Then, the gas flows from top to bottom in the air duct <NUM> and flows into the upper space of the lower ice-making tray 10B. In addition, the gas flows from the left side to the right side of the drawing in the upper space of the lower ice-making tray 10B. The liquid stored in each ice making region <NUM> of the ice-making tray 10B is cooled by this flow. Then, the gas flowing in the upper space of the ice-making tray 10B flows to the outside of the ice-making device <NUM> from an opening <NUM> (refer to <FIG>) provided in the cover <NUM>. The gas flowing to the outside of the ice-making device <NUM> flows in the refrigerator, and is cooled by the evaporator of the refrigerator again.

In the present embodiment, the fan <NUM> is provided above the upper ice-making tray 10A, but the present invention is not limited thereto. For example, the fan <NUM> can be provided on the lower ice-making tray 10B side, and the gas may also flow from the lower ice-making tray 10B side to the upper ice-making tray 10A side by means of the air duct <NUM>. Furthermore, in the case of three or more ice-making trays <NUM> arranged up and down, the fan <NUM> can be provided at one of the ice-making trays <NUM>, or the fan <NUM> can be provided at a plurality of ice-making trays <NUM> having different heights.

As above, the ice-making device <NUM> has the fan <NUM> for supplying the gas to the upper space of at least one ice-making tray 10A, and the air duct <NUM> provided on the side of the ice-making trays 10A, 10B and connected between the upper space of the upper ice-making tray 10A and the upper space of the lower ice-making tray 10B. The fan <NUM> may also be referred to as a gas supply portion. Thus, when the gas is supplied from the fan <NUM> to at least one ice-making tray 10A, the gas can be supplied to the other ice-making tray 10B through the air duct <NUM> provided on the side of the ice-making trays 10A, 10B. Thus, the liquid stored in the ice-making trays 10A, 10B can be efficiently cooled with a small number of fans <NUM>.

In the above embodiment, the ice-making device <NUM> has the fan <NUM> supplying the gas, but the present invention is not limited thereto. <FIG> shows a side sectional view of the refrigerator for explaining a variant of the ice-making device <NUM> according to claim <NUM>. As shown in <FIG>, in a case where a cold gas discharge port (for example, opening <NUM>) is provided around the ice-making device <NUM>, even without the fan <NUM>, the same function as described above can be achieved with a suction port <NUM> for introducing cold gas into the ice-making device <NUM>.

In <FIG>, the ice-making device <NUM> according to claim <NUM> is provided near the opening <NUM>, and the opening <NUM> is configured to feed the cold gas passing through the evaporator <NUM> of the refrigerator <NUM> into a freezing chamber <NUM>. In this case, when the suction port is provided on a side of or above the upper space of the ice-making tray 10A, the gas can be sucked into the upper space of one ice-making tray 10A. In <FIG>, the suction port <NUM> serving as the gas supply portion is provided on a side of the upper space of the ice-making tray 10A. In this way, the cold gas passing through the evaporator <NUM> can be directly sucked into the upper space of the ice-making tray 10A. In the case where the suction port <NUM> is provided on the side of the upper space of the ice-making tray 10A, in consideration of the flow of the gas, preferably, the suction port is provided at a position opposite to the side where the air duct <NUM> is provided.

During collective expression of the case of having the fan <NUM> and the case of having the suction port <NUM>, the ice-making device <NUM> may have the gas supply portions <NUM>, <NUM> for supplying the gas to the upper space of at least one ice-making tray 10A, and the air duct <NUM> provided on the side of the ice-making trays 10A, 10B and connected between the upper space of the upper ice-making tray 10A and the upper space of the lower ice-making tray 10B.

A following travel way of the ice released and dropped from the ice-making trays 10A, 10B after the ice-making trays 10A, 10B are rotated to the ice release position by the rotating mechanism <NUM> will be described with reference to <FIG>. As indicated by the dotted arrow of <FIG>, due to gravity, the ice dropped from the lower ice-making tray 10B directly falls into the storage container <NUM> provided below the ice-making device <NUM> according to claim <NUM>. On the other hand, due to the lower ice-making tray 10B, the ice dropped from the upper ice-making tray 10A is unable to directly enter the storage container <NUM>.

In the ice-making device <NUM> according to claim <NUM>, the cover <NUM> is provided at an upper portion of the lower ice-making tray 10B and configured to guide the ice falling from the upper ice-making tray 10A to fall on the side of the lower ice-making tray 10B. Further, the cover <NUM> has a curved surface. As such, the ice falling from the upper ice-making tray 10A moves along the curved surface and falls from the side of the ice-making device <NUM> into the storage container <NUM> provided below the ice-making device <NUM>. As such, the ice falling from the upper ice-making tray 10A can be smoothly stored in the storage container <NUM> while damage to the ice and a machine is avoided.

Further, the cover <NUM> can have a shape with both the curved surface and an inclined surface. As described above, the cover <NUM> is provided therein with the plurality of slit-shaped openings <NUM> for the gas supplied by the fan <NUM> to pass through.

As above, since the cover <NUM> is provided at the upper portion of the lower ice-making tray 10B and configured to guide the ice falling from the upper ice-making tray 10A to fall on the side of the lower ice-making tray 10B, the ice of the ice-making trays 10A, 10B arranged up and down can be accurately stored in the storage container <NUM>. Thus, the ice-making device <NUM> in which the ice-making trays 10A, 10B are provided up and down is realized, and the ice-making device <NUM> capable of supplying more ice while suppressing a reduction in a storage rate of the refrigerator can be provided.

<FIG> is a side sectional view illustrating one example of the refrigerator <NUM> having the ice-making device <NUM> according to claim <NUM>. Next, one example of the refrigerator <NUM> having the ice-making device <NUM> according to the above embodiment will be described with reference to <FIG>. In <FIG>, the ice-making device <NUM> and a liquid supply device <NUM> are depicted largely as compared to the refrigerator for illustrative purposes.

The ice-making device <NUM> according to claim <NUM> is provided on a rear side of the freezing chamber <NUM> of the refrigerator <NUM>, and the storage container <NUM> of the ice is provided below the ice-making device. The refrigerator <NUM> has therein the liquid supply device <NUM> for supplying liquid to the ice-making trays 10A, 10B of the ice-making device <NUM>. In the liquid supply device <NUM>, the liquid stored in a water tank <NUM> is supplied to a pipe <NUM> side by a discharge force of a pump <NUM>. Then, the liquid flowing down through the pipe <NUM> is supplied from the liquid supply port <NUM> to the upper ice-making tray 10A of the ice-making device <NUM>.

The refrigerator <NUM> has a cooling mechanism <NUM> which forms a cooling cycle mainly by a compressor <NUM>, a condenser <NUM> and the evaporator <NUM> to supply the cold gas into the refrigerator. The gas circulating in the refrigerator <NUM> is cooled while passing through the evaporator <NUM>. Then, as indicated by the dot-and-dash arrow, the gas cooled by a heat exchange in the evaporator <NUM> is blown into the freezing chamber <NUM> by a refrigerator fan <NUM> through the opening <NUM>. A part of the gas blown into the freezing chamber <NUM> is sucked into the ice-making device <NUM> by the fan <NUM> of the ice-making device <NUM> and supplied to the upper space of the upper ice-making tray 10A. The gas sucked into the ice-making device <NUM> flows from the upper space of the upper ice-making tray 10A to the upper space of the lower ice-making tray 10B by means of the air duct, and flows to the outside of the ice-making device <NUM> from the opening provided in the cover. The outflow gas flows towards the cooling mechanism <NUM> side by means of an opening <NUM> and is cooled while passing through the evaporator <NUM> again. By repeating such a gas circulation, the cooled gas is supplied into the ice-making device <NUM> without interruption, and the liquid in the ice-making trays 10A, 10B is frozen to make ice.

As above, in the refrigerator <NUM> having the ice-making device <NUM> in which the ice-making trays 10A, 10B are provided up and down, the occupied area in a plan view can be reduced as compared with the case where the ice-making trays are laterally arranged side by side. Thus, the refrigerator capable of supplying more ice while suppressing the reduction in the storage rate can be provided. As shown in <FIG>, the ice-making device <NUM> according to claim <NUM> can have a gas suction port <NUM> instead of the fan <NUM>. In this case, by directly sucking the cold gas blown into the freezing chamber <NUM> through the opening <NUM> from the gas suction port <NUM> into the ice-making device <NUM>, the cold gas can be supplied to the upper space of the upper ice-making tray 10A.

In the refrigerator <NUM> according to the above embodiment, the ice-making device <NUM> is provided in the freezing chamber <NUM>, but the present invention is not limited thereto. Since the plurality of ice-making trays 10A, 10B are provided up and down, the ice-making device <NUM> can be relatively easily provided in a door of the refrigerator <NUM>. In this case, however, there may exist a risk that water in the ice-making tray is scattered due to opening and closing operations of the door.

To solve this problem, as shown in <FIG> and <FIG>, guide rods <NUM> can be mounted to abut against protrusions of both side surfaces of the ice-making trays 10A, 10B along the row of the ice making regions <NUM> (i.e., along a longer direction). The guide rods <NUM> extend upwards from the upper surfaces <NUM> of the ice-making trays 10A, 10B. Thus, the water splashed due to the opening and closing operations of the door hits the guide rods <NUM> and returns to the ice making regions <NUM> of the ice-making trays 10A, 10B along inner surfaces of the guide rods <NUM>. By this guide rod <NUM>, the liquid in the ice-making trays 10A, 10B can be prevented from spilling outwards even when the door is opened and closed.

Since the protrusions of the ice-making trays 10A, 10B and the guide rods <NUM> are formed of a flexible resin material, the protrusions and the guide rods <NUM> can sufficiently accommodate a stress when the ice-making trays 10A, 10B are twisted for ice release and a vibration when the refrigerator door is strongly opened and closed. As above, in the refrigerator <NUM> having the ice-making device <NUM> according to claim <NUM> in the door, since the guide rods <NUM> extending upwards from the upper surfaces <NUM> of the ice-making trays 10A, 10B are provided on both side surfaces in the longer direction of the ice-making trays 10A, 10B, the liquid in the ice-making trays 10A, 10B can be effectively prevented from being splashed with the opening and closing operations of the door.

(<NUM>) A plurality of pieces of ice are made with the ice making regions <NUM> of the ice-making trays 10A, 10B in the above embodiment, but there may exist an ice crusher below the ice-making device <NUM> according to claim <NUM> for crushing the ice made with the ice-making device <NUM>. (<NUM>) In the above embodiment, the liquid stored in the water tank <NUM> of the liquid supply device <NUM> is supplied to the ice-making device <NUM>, but the ice-making device <NUM> can be connected to a water supply pipe, and the liquid can be directly supplied from the water supply pipe to the ice-making device <NUM>. (<NUM>) A separate ice-making device <NUM> according to claim <NUM> being independent of the refrigerator may also be realized when there exists a cooling mechanism dedicated to the ice-making device <NUM>.

Claim 1:
An ice-making device (<NUM>), comprising: a plurality of ice-making trays arranged up and down and a rotating mechanism (<NUM>), wherein said plurality of ice making trays comprises an upper ice-making tray (10A) and a lower ice-making tray (10B), and
wherein the rotating mechanism (<NUM>) is capable of rotating the plurality of ice-making trays between an ice making position where liquid can be stored and an ice release position where formed ice is released and dropped, wherein a cover (<NUM>) is provided at an upper portion of the lower ice-making tray (10B), characterized in that the cover (<NUM>) guides the ice falling from the upper ice-making tray (10A) to fall on a side of the lower ice-making tray (10B), wherein the cover (<NUM>) has a curved surface to separate the upper ice-making tray (10A) and the lower ice-making tray (10B), wherein the ice-making device (<NUM>) is configured so, that the ice falling from the upper ice-making tray (10A) moves along the curved surface of the cover (<NUM>) and falls from the side of the ice-making device (<NUM>) into a storage container (<NUM>) provided below the ice-making device (<NUM>).