Refrigerator with cool air distributing device

Abstract: A refrigerator has a cool air dispersing device (30) capable of dispersing cool air horizontally and vertically. In a duct behind the fresh food compartment (3) are installed horizontally dispersing blades (30) for dispersing the cool air flowing into the compartment horizontally and vertically dispersing blades (57) for dispersing cool air vertically. The horizontal dispersing blades (33) are rotated by a motor (35), and the rotation of the motor (35) is transmitted to the vertically dispersing blade as raising and lowering movement. Thus, the vertically dispersing blades (57) are pivoted while the horizontal dispersing blades (33) are rotated.

Description: The present invention relates to a refrigerator including a cooling compartment, a heat pump, means for driving cool air, produced by the heat pump, through a plurality of apertures, arranged one above another, into the cooling compartment, and flow directing means associated with the apertures for directing said cool air and which includes a single vertical blade means, comprising one or more vertical blades and rotatable about a vertical axis, the or each vertical blade being vertical when the refrigerator is in its operational orientation. 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 opening thereinto 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 supplied with the cool air sufficiently. 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, 3 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 rotational 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. However, since the blade parts 133, 134 of the cool air dispersing device 130 are S-shaped, the left or right sides of the fresh food compartment 3 may not be supplied with the cool air sufficiently and the smooth flow of cool air may be impeded by a vortices in the cool air formed about the cool air discharge ports 16. Moreover, although such a conventional cool air dispersing device 130 can achieve uniform distribution of cool air horizontally, the vertical distribution of cool air is not sufficiently uniform. Consequently, there is a limitation in realizing uniform cooling throughout the fresh food compartment 3. A refrigerator according to the present invention is characterised in that the or each vertical blade is planar and the directing means comprises a plurality of transverse blades, one above another, pivotable about respective axes which are horizontal when the refrigerator is in its operational orientation. Preferably, a motor is provided for rotating the or each vertical blade and pivoting the transverse blades. Preferably, the or each vertical blade is on a shaft drivingly coupled to the motor, the shaft having cam means for pivoting the transverse blades. In a preferred embodiment, a front edge of each transverse blade is directed generally at one of the apertures and the directing means comprises an actuator element coupled to the front edge of each transverse blade and having a projection engaging the cam means. The cam means may comprise an inclined groove running about the shaft and the projection may then be received in the groove. Alternatively, the cam means may comprise an inclined disc on the shaft and coaxial therewith, in which case the projection has a groove receiving a peripheral portion of the disc. In another preferred embodiment, a back edge of each transverse blade is directed away from one of the apertures and has a finger projecting backwards therefrom, and the directing means comprises an actuator element coupled to the finger of each transverse blade and to the cam means via a lever. Embodiments of the present invention will now be described, by way of example, with reference to Figures 4 to 19 of 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 side sectional view of a first refrigerator according to the present invention; Figure 5 is an exploded, perspective view of the cool air dispersing device of Figure 4; Figures 6 through 8 are enlarged transverse sectional views showing the cool air dispersing process performed by the horizontal dispersing blades of Figure 5; Figures 9 through 11 are enlarged side sectional views showing the cool air dispersing process performed by the vertical dispersing blades of Figure 5; Figure 12 is an exploded perspective view of the cool air dispersing device of a second refrigerator according to the present invention; Figure 13 is a perspective view of the elements in Figure 12 assembled together; Figures 14 through 16 are side sectional views of Figure 13, which show the cool air dispersing operation of the vertical dispersing blades; Figure 17 is an exploded perspective view of the cool air dispersing device of a third refrigerator according to the present invention; Figure 18 is a perspective view showing the elements of Figure 17 assembled together; and Figure 19 is an enlarged transverse sectional view of Figure 18. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Parts that are the same as or similar to 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, a refrigerator comprises a cabinet 1, a freezing compartment 2 and a fresh food compartment 3 formed within the cabinet 1 and separated by a partition wall 5. The freezing compartment 2 is disposed above the fresh food 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 fresh food compartment 3. A special fresh chamber 18 for storing food which requires a specific temperature range is formed in the upper part of the fresh food compartment 3, and a vegetable chamber 19 for storing vegetables is formed at the bottom of the fresh food 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, is installed in the cabinet 1. The cool air generated by the evaporators 12a, 12b is supplied into the corresponding cooling compartments 2, 3 by a freezing compartment fan 13a and a fresh food compartment fan 13b respectively. A duct plate 9 is attached on the inner wall plate 23, forming the rear wall of the fresh food compartment 3. The duct plate 9 is partially cylindrical in shape so that it protrudes in the form of an arc from the inner wall plate 23 into the fresh food compartment 3, and has cool air discharge ports 16 opening into respective storing areas of the fresh food compartment 3. Another cool air discharge port 16', opening into the special fresh chamber 18 is provided in the upper area of the inner wall plate 23. A supply duct 15 and a return duct 17 are provided between the duct plate 9 and the rear wall 4 of the cabinet 1. These ducts 15, 17 are partitioned from each other by a seal plate 25. A duct member 21 for guiding cool air, blown downwards by the fresh food compartment fan 13b, is installed in the supply duct 15. The cool air generated by the fresh food compartment evaporator 12b is blown by the fresh food compartment fan 13b so as to be supplied into the fresh food compartment 3 via the supply duct 15 and the cool air discharge ports 16. A device for dispersing the cool air horizontally is installed in the supply duct 15. Referring to Figure 5, the refrigerator has a device 30 for dispersing cool air horizontally and a device 40 for dispersing the cool air vertically. The horizontally dispersing device 30 comprises a vertical rotational shaft 31, three planar, horizontally dispersing blades 33, spaced along the shaft 31, and a driving motor 35 for rotating the rotational shaft 31. The three horizontally dispersing blades 33 are disposed near respective cool air discharge ports 16 formed in the duct plate 9. A coupling part 39, coupled to a driving shaft 36 of a driving motor 35, is provided at the upper end of the rotational shaft 31, and a journal part 32, received in a bearing hole 9g, formed at the bottom of the duct plate 9, is provided at the lower end of the rotational shaft 31. It is preferable that the driving motor 35 be a stepping motor which is capable of having its stationary angular position controlled. When the driving motor 35 operates, the horizontally dispersing blades 33 are rotated by the rotational shaft 31, and thereby cool air, discharged through the cool air discharge ports 16, is dispersed horizontally. The vertically dispersing device 40 comprises a plurality of vertically dispersing blades 57 which are disposed near the cool air discharge ports 16 and which are capable of pivoting about a horizontal axis, a vertically reciprocable link member 61 installed in the supply duct 15, and a raising and lowering cam 63 for raising and lowering the link member 61. Each vertically dispersing blade 57 comprises a generally arcuate plate so as to accommodate the horizontally dispersing blades 33 and horizontal stub shafts 53 extending from either end of the plate. The duct plate 9 has a pair of flanges 9e which extend backward from the rear surface of both side margins of the duct plate 9. The flanges 9e face each other and have a plurality of shaft holes 9f for receiving and rotatably supporting the stub shafts 53 of the vertically dispersing blades 57. The vertical dispersing blades 57 are capable of pivoting when their stub shafts 53 are inserted into the shaft holes 9f. The link member 61 is disposed parallel to the rotational shaft 31. The link member 61 is rod-shaped and has a plurality of partially ring-shaped hinge assembly parts 62 which protrude toward the vertically dispersing blades 57. Associated with a respective hinge assembly part 62, each of the vertically dispersing blades 57 has a horizontal, cylindrical hinge part 55 at the middle of its forward edge. The hinge assembly parts 62 are engaged with the hinge parts 73 so that there can be relative rotational movement therebetween. A raising and lowering cam 63 is installed on the rotational shaft 31. The raising and lowering cam 63 comprises a cylindrical cam body 66 and a cam groove 65 formed on the outer surface of the cam body 66. The cam groove 65 is an inclined closed loop. On the link member 61 is provided an operation part 67, protruding transversely of the longitudinal direction of the link member 61, and the free end of the operation part 67 is received by the cam groove 65. The link member 61 also has a guiding piece 69 protruding towards the duct plate 9. The guiding piece 69 is accommodated in a raising and lowering guiding part 49 formed on the inner wall of the duct plate 9. The raising and lowering guiding part 49 accommodates the guiding piece 69 so that the link member 61 moves up and down without rotating. The operation of the above-described refrigerator will now be described. Referring to Figures 6 to 8, the horizontally dispersing blades 33 rotate through 360 degrees as the driving motor 35 operates. When the horizontally dispersing blades 33 are directed to the front as shown in Figure 6, the cool air in the supply duct 15 is discharged directly to the front along both sides of the horizontally dispersing blades 33. When the horizontally dispersing blades 33 are rotated to the left or to the right as shown in Figures 7 and 8, the cool air is discharged toward the left side or the right side of the fresh food compartment 3. As described, the discharging direction of the cool air changes as the angular position of the horizontally dispersing blades 33 changes so that cool air is dispersed in the fresh food compartment 3 uniformly. Moreover, since the horizontally dispersing blades 33 are planar, vortices are not caused by the horizontally dispersing blades 33. If a concentrated supply of cool air to a specific area such as the left side or the right side is required, the driving motor 35 is stopped when the horizontally dispersing blades 33 are directed to the specific area. In this situation, temperature sensors placed at a plurality of positions in the fresh food compartment 3, as well as a control part for controlling the driving motor 35 on the basis of the signals from the temperature sensors have to be provided. The horizontally dispersing blades 33 are disposed in association with respective the cool air discharge ports 16. However, it is possible that only one long horizontally dispersing blade be provided for directing cool air through all of the cool air discharge ports 16. While the horizontally dispersing device 30 operates, the raising and lowering cam 63 rotates with the shaft 31 and the link member 61 is raised and lowered by the operation part 67 which is received in the cam groove 65. The raising and lowering movement of the link member 61 causes pivoting of the vertically dispersing blades 57 by means of the hinge assembly part 62 and the hinge parts 55. The raising and lowering motion of the link member 61 is guided vertically by the guiding piece 69 and the raising and lowering guiding part 49. Consequently, the link member 61 does not rotate but reciprocates in the vertical direction while the raising and lowering cam 63 rotates. Referring to Figure 9, while the vertically dispersing blades 71 are kept horizontal, cool air is discharged horizontally. When the shaft 31 rotates by about 90 degrees, the vertically dispersing blades 57 are tilted upward as shown in Figure 10 and, in this situation, cool air is discharged upward to be supplied into the upper area of the fresh food compartment 3. As the shaft 31 further rotates by about 90 degrees from the position shown in Figure 10, the vertically dispersing blades 57 are returned to the horizontal state as shown in Figure 9, and as it further rotates by about 90 degrees, the vertically dispersing blades 57 are tilted downwards as shown in Figure 11. In this situation, cool air is discharged downward. As described above, since the vertically dispersing device 40 operates together with the horizontally dispersing device 30, cool air is supplied uniformly in both the vertical and horizontal directions. Referring to Figures 12 and 13, in a second embodiment, the construction of the horizontally dispersing device 30 and the vertically dispersing device 40 is substantially the same with that of the above-described first embodiment. However, the construction of the raising and lowering cam 73 is different from that of the first embodiment. In the present embodiment, the raising and lowering cam 73 comprises a sloping disc 73 on the shaft 31. The disc 73 rotates with the shaft 31. An assembly part 76 assembled with the disc 73 is formed at the end of the operation part 67. The assembly part 76 consists of a pair of horizontal ribs disposed parallel to each other, which form a horizontal guide groove. The guide groove receives the edge of the disc 73. When the shaft 31 is rotated by the driving motor 35, the disc 73 rotates with the shaft 31 and the link member 61 is moved up and down. Therefore, as shown in Figures 14 through 16, cool air is dispersed vertically while being dispersed horizontally. The present embodiment has an advantage in that the construction of the cam for raising and lowering the link member 61 is simple. Referring to Figures 17 through 19, in a third embodiment, the construction of the horizontally dispersing device 30 and the vertically dispersing device 40 is substantially the same with that of the first embodiment. In particular, the construction of the raising and lowering cam 63 of the horizontal dispersing device 30 is the same with that of the first embodiment. However, the construction of the vertical pivoting means for driving the vertically dispersing device 40 is different. In this embodiment, the vertical pivoting means includes pivoting pins 85 protruding from the respective vertically dispersing blades 57, a link member 81 engaged by the pivoting pins 85, and a lever member 91 connecting the raising and lowering cam 63 and the link member 81 to each other. The link member 81 is formed with a plurality of regularly spaced receiving holes 82 for receiving the pivoting pins 85 along its length. A lever-supporting shaft 80 is formed on the inner side of the duct plate 9. The lever-supporting shaft 80 is inserted into a shaft hole 95 formed in the central part of the lever member 91, whereby the lever member 91 is rotatably supported by the lever supporting shaft 80. An operation part 87 protrudes from the link member 81 and is received in a guiding hole 93 formed in the lever member 91. The guiding hole 93 is elongate so that the movement of the lever member 91 is easily converted to raising and lowering movement of the link member 81. The lever member 91 is formed with a raising and lowering pin 97 which is inserted into the cam groove 65 of the raising and lowering cam 63. As the raising and lowering cam 63 is rotated by the driving motor 35, the lever member 91 pivots upward and downward about the lever supporting shaft 80. The link member 81 is moved up and down by such a levering movement of the lever member 91. While the link member 81 is raised and lowered, the vertically dispersing blades 57, coupled to the link member 81 by the pivoting pins 85 and the receiving holes 82, pivot upwards and downwards reciprocally. Therefore, cool air is dispersed horizontally and vertically. At both ends of each horizontal dispersing blade 33 are installed guide plates 34. Cool air flowing down the supply duct 15 strikes the guide plates 34 and is guided towards the cool air discharge ports 16. As described above, according to the present invention, a stable cool air flow and a uniform distribution of the cool air can be achieved without vortices in the cool air stream near the cool air discharge ports. Furthermore, the uniform distribution of the cool air can be achieved not only horizontally but also vertically.

Claims: A refrigerator including a cooling compartment (3), a heat pump, means (13b) for driving cool air, produced by the heat pump, through a plurality of apertures (16), arranged one above another, into the cooling compartment (3), and flow directing means (30) associated with the apertures (16) for directing said cool air and which includes a single vertical blade means, comprising one or more vertical blades (33) and rotatable about a vertical axis, the or each vertical blade (33) being vertical when the refrigerator is in its operational orientation, characterised in that the or each vertical blade (33) is planar and the directing means (30) comprises a plurality of transverse blades (57), one above another, pivotable about respective axes which are horizontal when the refrigerator is in its operational orientation. A refrigerator according to claim 1, including a motor (35) for rotating the or each vertical blade (33) and pivoting each transverse blade (57). A refrigerator according to claim 2, wherein the or each vertical blade (33) is on a shaft (31) drivingly coupled to the motor (35), the shaft (31) having cam means (63 ; 73) for pivoting the or each transverse blade (57). A refrigerator according to claim 3, wherein a front edge of each transverse blade (57) is directed generally at one of the apertures (16) and the directing means (30) comprises an actuator element (62) coupled to the front edge of each transverse blade (57) and having a projection (67) engaging the cam means (63). A refrigerator according to claim 4, wherein the cam means (63) comprises an inclined groove (65) running about the shaft (31) and the projection (67) is received in the groove (65). A refrigerator according to claim 4, wherein the cam means (73) comprises an inclined disc (73) on the shaft (31) and coaxial therewith and the projection (67) has a groove (76) receiving a peripheral portion of the disc (73). A refrigerator according to claim 3, wherein a back edge of each transverse blade (57) is directed away from one of the apertures (16) and has a finger (85) projecting backwards therefrom, and the directing means (30) comprises an actuator element (81) coupled to the finger (85) of each transverse blade and to the cam means (63) via a lever (91).

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