Refrigerator

Abstract: A refrigerator is disclosed and comprises a cooling compartment (3), a heat pump (11,12a,12b), means (13b) for driving cool air generated by the heat pump (11,12a,12b) through an aperture (26) into the cooling compartment (3). The refrigerator has flow directing means (31) associated with the aperture (26) including a discharge pipe (35) which is movable to vary the direction of flow of cool air into the cooling compartment (3). A motor for controlling movement of the discharge pipe (35) is also disclosed.

Description: The present invention relates to a refrigerator according to the preamble of claim 1. Such a refrigerator is known from WO-A-95/27178. Generally, a refrigerator has a cabinet in which there are a freezing compartment and a fresh food compartment. These compartments are separated by a partition wall. Doors are provided at the front of the freezing and cooling compartments. A cooling system supplies the freezing compartment and the fresh food compartment with cool air and comprises a compressor, a condenser and an evaporator. The cool air generated by the evaporator flows along a supply duct formed at the back of each compartment, and is then supplied into each cooling compartment through cool air discharge ports by a fan. In such a conventional refrigerator, however, cool air tends to be supplied into a particular area of the cooling compartment and other areas tend to be less well served. Consequently, a uniform temperature is not maintained throughout the cooling compartment. This problem has been addressed by providing cool air discharge ports in the side walls of the cooling compartment as well as in its rear wall. However, there may be still a dead-zone at an edge area which is not sufficiently supplied with cool air. Furthermore, the ducting required to supply cool air from the sides of the cooling compartment reduces the space available for food and increases the cost of manufacture. The problem of adequately distributing cool air in a refrigerator is worse for larger refrigerators. Figures 1 through 3 are a side view, a partial enlarged sectional view, and an exploded perspective view of the main elements of a refrigerator having a device for dispersing cool air, as disclosed in WO-A-95/27178. Referring to Figures 1 to 3, a refrigerator comprises freezing and fresh food compartments 2, in a cabinet 1, which are separated from each other by a partition wall 5. Respective doors 6, 7 are provided for closing the compartments 2, 3. A cooling system, comprising a compressor 11, a condenser (not shown), a freezing compartment evaporator 12a, and a fresh food compartment evaporator 12b, is installed in the cabinet 1. Cool air generated by the evaporators 12a, 12b is supplied to the corresponding compartments 2, 3 by a freezing compartment fan 13a and a fresh food compartment fan 13b respectively. A partially cylindrical duct plate 9 is attached to an inner wall plate 23 forming the rear inner wall surface of the fresh food compartment 3. The duct plate 9 has cool air discharge ports 16, opening into the fresh food compartment 3, formed in it. A supply duct 15 and a return duct 17, separated from each other by a seal plate 25, are provided between the duct plate 9 and the rear wall 4 of the cabinet 1. A duct member 21, for guiding downwards cool air blown by the fresh food compartment fan 13b, is installed in the supply duct 15. Cool air generated by the fresh food compartment evaporator 12b is blown by the fresh food compartment fan 13b and then supplied to the fresh food compartment 3 via the supply duct 15 and the cool air discharge ports 16. A cool air dispersing device 130 is installed in the supply duct 15. The cool air dispersing device 130 comprises a rotational shaft 131 having a vertical axis, cool air dispersing blades 132 assembled with the rotational shaft 131 in correspondence with respective cool air discharge ports 16, and a driving motor 135 for rotating the rotational shaft 131. Each of the cool air dispersing blades 132 comprises three discs 136, 137, 138 disposed in parallel with each other along the shaft 131, and first and second blade parts 133,134 disposed between pairs of the discs 136,137,138. Each of the blade parts 133,134 is curved so that its cross-section is loosely S-shaped. The blade parts 133,134 are bent in opposite directions to each other. In a refrigerator having the above-described constitution, when the driving motor 131 rotates the rotation shaft 131 at a low speed, cool air flowing along the supply duct 15 changes its direction along the curved surfaces of the cool air dispersing blades 132, and is directed into the fresh food compartment 3 so as to disperse horizontally. When concentrated cooling in a specific area is needed, the driving motor 135 stops the rotational shaft 131 so that the cool air dispersing blades 132 direct cool air to the specific area. A disadvantage with a conventional refrigerator is that the cool air dispersing device 130 has a complex structure and so is hard to manufacture. Therefore, manufacturing costs increase. Additionally, as the cool air discharge ports 16 are always in an open state, air in the cooling compartment 3 generated by evaporator 12b may flow back into the supply duct 15 through the cool air discharge ports 16 causing condensation to form on the cooling compartment evaporator 12b. This lowers the cooling efficiency of the refrigerator. Moreover, the cool aid dispersing device 130 installed in a conventional refrigerator cannot distribute cool air uniformly throughout the cooling compartment resulting in the existence of a temperature difference between the upper and lower areas of the cooling compartment 3. Furthermore, it is not possible to direct cool air to a specific area of the cooling compartment as and when required. According to the present invention, there is provided a refrigerator comprising a cooling compartment, a heat pump, a cool air duct, means for driving cool air generated by the heat pump through an aperture in the cool air duct into the cooling compartment, and flow directing means for directing said cool air into the cooling compartment, characterised in that the flow directing means includes a discharge pipe movably mounted in the duct so as to close the aperture to vary the direction of flow of cool air into the cooling compartment. Conveniently, the cool air duct includes a support member surrounding the aperture for receiving the flow directing means. In a preferred embodiment, flow directing means includes a plate slideably received in a recess in the support member, the discharge pipe extending from the plate, the plate preferably being arcuate in shape, the recess having a corresponding arcuate shape to slideably receive the plate. Conveniently, drive means are included for controlling movement of the discharge pipe, said drive means preferably including rotatably mounted cam means, and cam follower means associated with the cam means extending from the flow directing means for causing reciprocal movement of the discharge pipe during rotation of the cam means. A preferred embodiment of the invention includes a rotatably mounted shaft, the cam means comprising a disc coaxial with the shaft and tilted at a predetermined angle with respect thereto. Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a side sectional view of a prior art refrigerator having cool air dispersing blades; Figure 2 is a partial enlarged sectional view of Figure 1; Figure 3 is an enlarged exploded perspective view of the main elements of Figure. 2; Figure 4 is a front view of a first refrigerator according to the present invention; Figure 5 is a side sectional view of Figure 4; Figure 6 is a partial enlarged exploded perspective view of the first cool air dispersing device of Figure 5; Figure. 7 is a transverse sectional view of the cool air dispersing device of Figure 6 in an assembled state; Figures. 8 through 10 are side sectional views of the cool air dispersing device of Figure 6 installed in a first refrigerator as shown in Figure 4; Figure. 11 is an exploded perspective view of a second cool air dispersing device according to the present invention; Figures. 12 through 14 are transverse sectional views of the cool air dispersing device of Figure 11 in an assembled state; Figure. 15 is a side sectional view of a second refrigerator according to the present invention; Figure. 16 is a partial enlarged exploded perspective view of the refrigerator of Figure 15; and Figures. 17 through 19 are side sectional views of the second cool air dispersing device according to Figure 11 installed in the second refrigerator of Figure 15. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Parts identical or similar to those parts shown in Figures. 1 through 3 will be identified with the same reference numerals. The description of the parts which are substantially the same as those of the prior art will be omitted. Referring to Figure 4, refrigerator comprises a cabinet 1, a freezing compartment 2 and a cooling compartment 3 formed within the cabinet 1 and separated by a partition wall 5. The freezing compartment 2 is disposed above the cooling compartment 3. The compartments 2, 3 are provided with respective doors 6, 7. Shelves 8 for supporting food and which divide the fresh food compartment 3 into three areas, i. e., an upper area, a middle area, and a lower area, are installed in the cooling compartment 3. A special fresh chamber 18 for storing food which requires a specific temperature range is formed in the upper part of the cooling compartment 3, and a vegetable chamber 19 for storing vegetables is formed in the lower part of the cooling compartment 3. A cooling system comprising a compressor 11, a condenser (not shown), a freezing compartment evaporator 12a, and a fresh food compartment evaporator 12b are installed in the cabinet 1. The cool air generated by the evaporators 12a, 12b is supplied into the corresponding cooling compartments 2 and 3 by a freezing compartment fan 13a and a fresh food compartment fan 13b respectively. A supply duct 15 and a return duct 17 are provided to the rear of the cooling compartment 3. The supply duct 15 is formed from a plate 9 attached to the rear wall of the cooling compartment 3. The plate 9 has a central opening 26 into the fresh food compartment 3. A discharge member 31 is mounted on the back of the duct and comprises a plate 33 and a discharge pipe 35. The plate 33 covers the opening 26 of the duct plate 9 and the discharge pipe 35 provides a cool air passage 37 for cool air to flow therethrough into the cooling compartment 3. The discharge member 31 is supported by a guide member 61 and the opening 26 extends through the guide part 61. Vertical recesses 64 are formed on both side surfaces of the guide part 61 and horizontal recesses 66 are formed on the upper and lower surfaces. The vertical and horizontal recesses 64, 66 receive both of the side edges, the upper edge, and the lower edge of the plate 33, respectively. The depth of the horizontal recesses are sufficient to enable the plate 33 to move in a vertical plane, the plate 33 being retained and guided by the recesses 64. When the plate 33 moves in a vertical upward direction within the vertical recesses 64, the discharge pipe 35 is tilted and points towards the upper part of the cooling compartment 3. Further, when the plate 33 is moved in a vertical downward direction, the discharge pipe 35 is tilted and points towards the lower part of the cooling compartment 3. The vertical recesses 64 are arcuate in shape, and the plate 33 is also arcuately shaped so as to correspond to the vertical recesses 64. The operation of the first cool air dispersing device having the above-described construction will now be described. The cool air generated by the cooling compartment evaporator 12b is driven into the supply duct 15 by the cooling compartment fan 13b and passes into the fresh food compartment 3 through the discharge pipe 35. The direction of discharge of the cool air is determined by the position of the discharge member 31. When a user elevates or upwardly tilts the discharge member 3, as shown in Figure 8, the cool air is discharged in a direction toward the upper part of the cooling compartment 3 through the discharge pipe 35. Similarly, if the user positions the discharge member 31 in a central position as shown in Figure. 9, the cool air is discharged toward the middle of the cooling compartment 3. Finally, if the discharge member 31 is tilted downward, as shown in Figure. 10, the cool air is discharged toward the lower part of the cooling compartment 3. As well as directing the cool air in the required direction, as the discharge pipe 35 is small, the amount of air flowing back toward the evaporator 12b is reduced and so little or no condensation is generated on the evaporator 12b thereby improving its cooling efficiency. A second cool air dispersing device is illustrated in Figures 11-14. The construction of the duct plate 9 is identical to that of the first cool air dispersing device. Further, the discharge member 31 has, as described above, a plate 33, and a discharge pipe 35 through which cool air can pass into the cooling compartment 3. A guide 61a is mounted on the rear of the duct plate 9 for supporting the discharge member 31 and has, as described above, vertical recesses 64a and horizontal recesses 66a. In the present embodiment, however, the depths of the vertical recesses 64a and the horizontal recesses 66a are different from those of the vertical and horizontal recesses 64 and 66 shown in the above-described first embodiment. The depth of the vertical recesses 64a is sufficient to enable horizontal movement of the plate 33, whereas horizontal recesses 66a correspond to the height of the plate 33, such that the plate 33 is constrained and cannot move vertically. Accordingly, the plate 30 can slide in a horizontal plane within the recesses 66a so that the discharge pipe 35 can be tilted to either the right or the left to direct cool air to the right or left hand side respectively of the cooling compartment 3. The horizontal recesses 66a are arcuate in shape, and the plate 33 of the discharge member 31 is also arcuately shaped to correspond to the arcuate horizontal recesses 66a. Accordingly, when the discharge member 31 is moved to the right or left, the cool air is discharged toward the right or the left area of the fresh food compartment 3 as shown in Figures. 13 and 14. Similarly, if the user positions the discharge member 31 in a central position as shown in Figure. 12, the cool air is discharged toward the middle of the cooling compartment 3. A side sectional view of a second refrigerator according to the invention is shown in Figure 15. A partial enlarged exploded perspective view of Figure. 15, is shown in Figure 16 and Figures 17 through 19 and illustrate side sectional views of the refrigerator shown in Figure 16 in an assembled state. In this embodiment, the construction of the duct plate 9, the discharge member 31, the guide part 61 and the recesses 64, 66 are identical to those in the aforementioned first embodiment, the discharge member 31 being able to slide vertically within the recesses 64. However, in the present embodiment the refrigerator further comprises a driving device comprising a motor 45, a rotatably mounted shaft 43, a cam 49, and a cam follower 48, 41 to control movement of the discharge pipe 35. The shaft 43 is vertically disposed and its upper end is coupled to the shaft 45a of a motor 45. The other lower end of the shaft 43 is located in a support hole 28 drilled in the base of the duct plate 9. The cam 49 comprises a disc mounted on the shaft 43 coaxially therewith but tilted at a predetermined angle with respect to the axis of rotation of the shaft. The cam follower 48 comprises a slotted member 47 mounted on the end of a rod 46 extending from the discharge member 31. The edge of the cam 49, is received in the slot of the member 47. The shaft 43 is rotated in response to operation of the motor which is controlled by a microprocessor (not shown). As the shaft 43 is rotates, the discharge member 31 is reciprocally moved up and down by the cam 49 and the cam follower 48. This arrangement is illustrated in Figures 17 to 19 which show the discharge member 31 in a raised, central and lowered position respectively. As the shaft 43 is continuously rotated by the motor 45, the direction of discharge of the cool air is constantly varied due to the changing orientation of the discharge pipe 35. When the temperature of a specific area in the cooling compartment 3 rises, the position of the shaft 43 can be controlled to position the discharge pipe 35 so that the cool air is directed to that specific area. A rise in temperature of a specific area in the fresh food compartment 3 can be detected by a sensor (not shown), which outputs a signal to the microprocessor (not shown) to control the motor so that it stops rotating when the discharge pipe 35 is tilted toward the specific area. The motor 45 is a stepping motor to enable accurate control to stop rotation of the shaft 43 when the discharge pipe is tilted in the required direction. The present invention provides a refrigerator which is capable of preventing air from flowing back from the cooling compartment 3 to the evaporator. Furthermore, uniform distribution of cool air can be achieved throughout the cooling compartment 3 and the direction in which cool air is discharged can be altered manually when required.

Claims: A refrigerator comprising a cooling compartment (3), a heat pump (11,12a,12b), a cool air duct (15), means (13b) for driving cool air generated by the heat pump (11,12a,12b) through an aperture (26) in the cool air duct (15) into the cooling compartment (3), and flow directing means (31) for directing said cool air into the cooling compartment (3), characterised in that the flow directing means (31) includes a discharge pipe (35) movably mounted in the duct so as to close the aperture (26) to vary the direction of flow of cool air into the cooling compartment (3). A refrigerator according to claim 1 wherein the cool air duct (15) includes a support member (61) surrounding the aperture (26) for receiving the flow directing means (31). A refrigerator according to claim 2 wherein the flow directing means (31) includes a plate (33) slideably received in a recess (64,66) in the support member (61), the discharge pipe (35) extending from the plate (33). A refrigerator according to claim 3 wherein the plate (33) is arcuate in shape, the recess (64,66) having a corresponding arcuate shape to slideably receive the plate (33). A refrigerator according to any preceding claim, including drive means (41,48) for controlling movement of the discharge pipe (35). A refrigerator according to claim 5 wherein the drive means (41,48) includes rotatably mounted cam means (49), and cam follower means (46,47) associated with the cam means (49) extending from the flow directing means (31) for causing reciprocal movement of the discharge pipe (31) during rotation of the cam means (49). A refrigerator according to claim 6 including a rotatably mounted shaft (43), the cam means (49) comprising a disc coaxial with the shaft (43) and tilted at a predetermined angle with respect thereto.

Inventors: JI JOON DONG, JI, JOON DONG
Applicants: SAMSUNG ELECTRONICS CO LTD, SAMSUNG ELECTRONICS CO., LTD.
Application year: 1998
Main classification: F25D11
IPC codes: F24F13, F25D17