REFRIGERATED CABINET
A refrigeration system comprising a refrigerated cabinet having a front opening through which access is gained to the cabinet and the cabinet being subdivided into at least one compartment. Each compartment is adapted to be occupied by a drawer, each drawer being moveable within the compartment from a retracted position at which it is accommodated within the compartment and an extended position at which it partly extends forwardly from the compartment and whereby the interior of the drawer is accessible. The system further comprises cooling means provided remote from the cabinet. Each compartment has valved porting means provided in a rear wall thereof for connecting to the cooling means wherein when the drawer is in the retracted position, the cooling means is in fluid communication with the drawer and when the drawer is in an extended position the cooling means is isolated from the compartment.
Latest DNA HOLDINGS PTY LTD Patents:
This application is a continuation-in-part of U.S. application Ser. No. 10/552,409 filed Nov. 11, 2006, which is the U.S. national phase application of PCT application Serial No. PCT/AU04/00447 filed Apr. 6, 2004, now abandoned, which, in turn, claims priority to Australian application Serial No. 2003901561 filed Apr. 7, 2003. The disclosures of which are incorporated in their entirety by reference herein.
BACKGROUND1. Field of the Invention
The present invention relates to a refrigerated cabinet and refrigeration system.
2. Background
It is a characteristic of refrigerated cabinets such as domestic refrigerators that they provide a storage space and have a front door which is opened to enable access into the storage space. A difficulty with conventional domestic refrigerators arises from the circumstances that when the door is opened, all of the cold air contained within the storage cabinet is able to readily escape through the open front opening of the storage space. In addition in commercial situations it is an established practice to provide cool rooms with doors which facilitate access into the cool room for the purposes of extracting goods from the cool room and/or the purposes of entry. Furthermore in retail sites it is common practice to provide refrigerated cabinets which have a permanently open front opening to facilitate access by customers to the goods contained within that cabinet through the open front opening. In order to prevent the loss of cool air from the cabinet it is usual practice to generate a forced air flow through the space which tends to control the flow of cool air to limit its loss through the open front opening of the cabinet and/or to provide a curtain-like closure which provides a temporary closure to the space but which is readily capable of being displaced to enable access into the space.
SUMMARY OF THE INVENTIONAccording to the present invention there is provided a refrigeration system comprising a refrigerated cabinet having a front opening through which access is gained to the cabinet, the cabinet being subdivided into at least one compartment, each compartment adapted to be occupied by a drawer, each drawer being moveable within the compartment from a retracted position at which it is accommodated within the compartment and an extended position at which it partly extends forwardly from the compartment, and whereby the interior of the drawer is accessible from an upper portion of the drawer, the system further comprising cooling means provided remote from the cabinet, each compartment having valved porting means provided in a rear wall thereof for connecting to the cooling means wherein when the drawer is in the retracted position, the cooling means is in fluid communication with the drawer and when the drawer is in an extended position the cooling means is isolated from the compartment.
Preferably the refrigerated cabinet is one of a plurality of refrigerated cabinets and the cooling means is provided to each refrigerated cabinet from a common cooling source.
Preferably the valved porting means comprises a short connecting duct entering the rear wall of the compartment and housing a valve which is adapted to be engaged by a nozzle in the rear wall of the drawer.
The invention will be more fully understood in the light of the following description of several specific embodiments.
The invention is described with reference to the accompanying drawings of which;
The first embodiment shown in the accompanying drawings relates to a domestic refrigerator which comprises a cabinet 11 which defines a storage space within its interior. The cabinet 11 is open at its front opening and is provided with a door 13 which is associated with the front opening to be moveable from a closed position as shown at
The cabinet is associated with a conventional refrigeration circuit comprises compressor 19 supported in the lower portion of the cabinet, a condenser 21 supported from the rear exterior face of the cabinet and a vaporiser 22 which is accommodated at the upper end of the compartment of the space. If desired the refrigerator can be provided with a fan which causes air to pass over the vaporiser and thence through the space.
The space within the cabinet comprises a plenum 23 defined between the rear wall 25 of the space at an intermediate wall 27 which is spaced inwardly from the rear wall 25. The intermediate wall is provided with a plurality of openings 29 which provide communication between plenum 23 and an intermediate portion 24 of the space defined between the intermediate wall 27 and the rear walls of the compartments.
Each compartment 15 slidably supports a drawer 31 which is moveable from a retracted position at which it is fully accommodated within the compartment 15 (as shown in
As a result of the embodiment the space within the refrigerated cabinet is divided into a plurality of spaces which are each defined by the drawers 31. Access to the drawers 31 is gained by opening the door 13 of the cabinet and moving the respective drawer 31 to its extended position. In so doing the communication between the plenum 23 and the respective compartment 15 is closed as a result of the closing of the closure 17. Access to the contents of drawer 31 are gained through the open top of the drawer. As a result communication between the plenum 23 and each compartment is only effected when the drawer contained within the compartment is in its retracted position. Therefore when the door 13 of the cabinet is open substantially little cold air is lost from the storage space within the cabinet even when access is gained to the interior of a drawer. With the door 13 open and a drawer 31 in its extended position the plenum 23 is closed and access to the drawer is through the open top only and therefore little cool air is lost through the compartment. The most significant loss of cool air is a result of disturbance of the contents of the drawer.
In addition the door 13 supports a set of storage zones (not shown) which are each associated with a separate closure which enables access into each storage zone. Each storage zone is connected to a duct in the door which connects with a corresponding positioned passageway in the upper wall of the cabinet when the door is closed and which communicates with the space around the vaporiser to enable cool air to flow into each storage zone to cool the contents thereof. If desired the passageway can also communicate with the space defined between the door and the front opening of the cabinet when the door is in its closed position.
According to a second embodiment of the invention (not shown) the closure of each compartment may be accommodated by the rear wall of the drawer which cooperates with the walls of the compartment to sealingly close the compartment on a drawer being moved from the retracted position to the extended position but when the drawer is in the closed position opens to provide communication between the source of cool air and the interior of the drawer.
According to a third embodiment of the invention the drawer substantially cooperates with the walls of the compartment to substantially prevent any substantial movement of cool air from the plenum past the drawer and through the front opening. The engagement need not be a sealing engagement. In addition the upper face cooperates with the upper wall of the compartment whereby when thon the drawer moving to the retracted position the upper open face of the drawer opens into the plenum space. According to this embodiment no closure is provided between the respective compartment and the plenum space to isolate the compartment from the plenum space when the drawer is moved towards its extended position.
Each of the embodiments of the invention described above can be applied to a domestic refrigerated cabinet, domestic freezers, commercial cool rooms, commercial refrigerated cabinets and the like.
However, by the application of the invention a number of the constraints to the design of refrigerator systems are removed and a design is able to provide quite innovative designs which embrace the invention. In a fourth embodiment, as shown in
The compartment 111 comprises an insulated wall and has a front opening through which access is gained to the space and encloses a drawer 114 adapted to slide between an extended position for access to the drawer and a retracted position wherein the drawer 114 is substantially enclosed within the compartment 111. The front, external wall 115 of the drawer is insulated and sealing means is provided between the drawer and the compartment (not shown) so that when the drawer is in the retracted position the contents of the drawer are fully sealed and insulated within the compartment. A suitable cooling means is provided so that when the drawer 114 is in its retracted position the cooling means is adapted to cool the contents of the drawer and when the drawer 114 is not in the retracted position the drawer is isolated from the cooling means.
This arrangement allows considerable freedom of choice over the selection of the cooling means. In the fourth embodiment, chilled air produced by a remote source is distributed through a suitable ducting system 121. As shown in
In the embodiment, as shown in
In certain adaptations, the nozzle 124 is also valved although this is not considered important as external air must enter space behind the drawer when the drawer is in the extended position. In the embodiment as shown in
As mentioned earlier, the cooling means may take many forms. In a fifth embodiment, as shown in
The arrangements such as those described in relation to the fourth and fifth embodiments lend themselves to providing a plurality of separated compartments in a single refrigeration system, as shown in
The refrigeration system further comprises cooling means provided remote from the cabinet for cooling each of the compartments in the cabinet. Each compartment has valved porting means provided in a rear wall thereof for connecting to the cooling means. When a drawer is in the retracted position, the cooling means is in fluid communication with the drawer and when the drawer is in an extended position the cooling means is isolated from the compartment occupied by the drawer.
As with the arrangement shown in
Preferably a pair of connecting ducts and corresponding nozzles are provide in connection with each compartment and its drawer, a first connecting duct and its corresponding nozzle being located towards an upper region of the rear wall of the drawer and the compartment, and a second connecting duct and its corresponding nozzle being located towards a lower region of the rear wall of the drawer and the compartment. Preferably cool air enters the compartment and its drawer through the second connecting duct and its corresponding nozzle, and exits the compartment and its drawer through the first connecting duct and its corresponding nozzle. Hence the cool circulates through the drawer in a generally clockwise direction when viewed as shown in
All of the embodiments show a considerable improvement in total efficiency over conventional refrigerators, as a result of the fact that there is a very substantial reduction in the volume of cooled air which is lost when a compartment is opened. In addition, they are more accessible because the goods are arranged in the drawers rather than being stacked on shelves where the rearmost items are relatively inaccessible. This is an advantage to the general user but even more particular to those suffering from a disability.
Throughout the specification, unless the context requires otherwise, the word “comprise” or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.
It will be readily apparent to persons skilled in the relevant arts that various modifications and improvements may be made to the foregoing embodiments, in addition to those already described, without departing from the basic inventive concepts of the present invention. Therefore, it will be appreciated that the scope of the invention is not limited to the specific embodiments described and is to be determined from the appended claims.
Claims
1. A refrigeration system comprising a refrigerated cabinet having a front opening through which access is gained to the cabinet, the cabinet being subdivided into at least one compartment, each compartment adapted to be occupied by a drawer, each drawer being moveable within the compartment from a retracted position at which it is accommodated within the compartment and an extended position at which it partly extends forwardly from the compartment, and whereby the interior of the drawer is accessible from an upper portion of the drawer, the system further comprising cooling means provided remote from the cabinet, each compartment having valved porting means provided in a rear wall thereof for connecting to the cooling means wherein when the drawer is in the retracted position, the cooling means is in fluid communication with the drawer and when the drawer is in the extended position the cooling means is isolated from the compartment.
2. A refrigeration system as claimed at claim 1, wherein the refrigerated cabinet is one of a plurality of refrigerated cabinets and the cooling means is provided to each refrigerated cabinet from a common cooling source.
3. A refrigeration system as claimed at claim 1, wherein the valved porting means comprises a short connecting duct entering the rear wall of the compartment and housing a valve which is adapted to be engaged by a nozzle in the rear wall of the drawer.
4. A refrigeration system as claimed at claim 3, wherein the short connecting duct is one of first and second connecting ducts and the nozzle is one of respective first and second nozzles.
5. A refrigeration system as claimed at claim 4, wherein the first connecting duct and its corresponding nozzle is located towards an upper region of the rear wall of the drawer and the compartment, and the second connecting duct and its corresponding nozzle is located towards a lower region of the rear wall of the drawer and the compartment.
6. A refrigeration system as claimed at claim 3, wherein the valve comprises a plurality of resilient leaves normally extending across the throat of the connecting duct to thereby seal the duct.
7. A refrigeration system as claimed at claim 6, wherein the leaves are readily displaced by the nozzle when the nozzle engages the valve to permit communication of the chilled air into the drawer space.
8. A refrigeration system as claimed at claim 1, wherein one of the compartments is provided immediately below bench-top level and is provided with a transparent viewing panel to enable a user to identify the contents without opening the drawer.
9. A refrigeration system as claimed at claim 8, wherein the transparent panel is sealingly hinged so that it can be opened to thereby provide an additional means of access to the drawer.
10. A refrigeration system as claimed at claim 1, wherein thermostatic control is provided for each compartment, whereby certain compartments can be configured as freezer units while others are less cooled for general chilled goods.
Type: Application
Filed: Feb 17, 2010
Publication Date: Aug 19, 2010
Applicant: DNA HOLDINGS PTY LTD (Western Australia)
Inventor: Griff Michael Morris (Western Australia)
Application Number: 12/707,246
International Classification: A47F 3/04 (20060101); F25D 13/04 (20060101);