Patent Grant
7124602
This nonprovisional application claims priority under 35 U.S.C. § 119(a) on Patent Application No. 10-2003-0005890 filed in Korea on Jan. 29, 2003, which is herein incorporated by reference.
1. Field of the Invention
The present invention relates to a direct cooling type refrigerator, and more particularly to a direct cooling type refrigerator in which the contact area between an inner casing defined with a storage compartment and an evaporator is large so that the storage compartment can be rapidly cooled.
2. Description of the Related Art
Generally, refrigerators may be classified, in terms of their cooling systems, into a direct cooling type refrigerator, in which its inner casing defined with a storage compartment to be used as a freezing compartment or refrigerating compartment is directly cooled by an evaporator, and an indirect cooling type refrigerator, in which cold air produced in accordance with a heat exchange operation of the evaporator is supplied to the storage compartment by a cooling fan.
As shown in
The condenser 10 includes a heat transfer plate 10a, and a condensing pipe 10b attached to one surface of the heat transfer plate 10a such that it is linearly in contact with the heat transfer plate 10a.
The evaporator 14 is a hollow circular evaporating pipe attached to the outer side surfaces of the inner casing 4, and adapted to allow a refrigerant R to pass therethrough.
The evaporating pipe 14 is arranged along the outer surface of the inner casing 54. This evaporating pipe 14 has a plurality of connected pipe portions extending horizontally while being vertically spaced apart from one another. The evaporating pipe 14 is fixed by aluminum tapes 15 attached to the inner casing 54 such that it is linearly in contact with the inner casing.
In the above mentioned conventional direct cooling type refrigerator, the time taken to transfer the heat from the inner casing 4 to the refrigerant R passing through the evaporating pipe 14 is lengthened because the hollow circular evaporating pipe 14 is linearly in contact with the inner casing 4. Furthermore, the evaporating pipe 14 may not be in contact with the inner casing 4 at a certain portion thereof. In this case, there may be problems of an increased deviation in cooling performance. Moreover, the evaporating pipe 14 cannot be firmly fixed because it is fixed to the aluminum tape 15 which is, in turn, fixed to the inner casing 4. For this reason, the contact between the evaporating pipe 14 and the inner casing 4 may be degraded when an external impact is applied to the refrigerator.
In such an evaporator, however, there may be a problem in that the expansion of the heat transfer metal member by high-pressure air may be non-uniform, so that pressure drop or blocking of a refrigerant flow may occur at a portion of the refrigerant passage 36.
The present invention has been made in view of the above mentioned problems involved with the related art, and an object of the invention is to provide a direct cooling type refrigerator capable of making a refrigerant used therein exhibit high heat exchange performance, thereby rapidly cooling its storage compartment, while exhibiting a minimum heat exchange performance deviation.
Another object of the invention is to provide an evaporating pipe fixing method in a direct cooling type refrigerator which is capable of firmly fixing an evaporating pipe to an inner casing of the refrigerator.
In accordance with one aspect, the present invention provides a direct cooling type refrigerator comprising: an outer casing defining an appearance of the refrigerator; an inner casing arranged within the outer casing, and defined with a storage compartment; an insulator interposed between the outer casing and the inner casing; a compressor for compressing a refrigerant; and an evaporator arranged to be in contact with the inner casing, and adapted to cool the inner casing in accordance with evaporation of a refrigerant passing therethrough.
In accordance with another aspect, the present invention provides an evaporating pipe fixing method in a refrigerator comprising the steps of: (A) forming, at an evaporating pipe, a surface contact area adapted to come into contact with an inner casing of the refrigerator; (B) applying an adhesive to the surface contact area of the evaporating pipe; and (C) bringing the evaporating pipe into close contact with the inner casing such that it is bonded to the inner casing at the surface contact area.
In accordance with another aspect, the present invention provides an evaporating pipe fixing method in a refrigerator comprising the steps of: (A) forming, at an evaporating pipe, a surface contact area adapted to come into contact with an inner casing of the refrigerator; (B) attaching a release tape coated with an adhesive to the surface contact area of the evaporating pipe; and (C) separating the release tape from the evaporating pipe such that the adhesive is exposed, and bringing the evaporating pipe into close contact with the inner casing such that it is bonded to the inner casing at the surface contact area.
The above objects, and other features and advantages of the present invention will become more apparent after reading the following detailed description when taken in conjunction with the drawings, in which:
Now, preferred embodiments of the present invention will be described in detail with reference to the annexed drawings.
Referring to
As shown in
As shown in
The heat transfer plate 59 is formed with through holes 59a so that it can easily discharge heat therefrom into surrounding air.
The condensing pipe 60 has opposite flat side portions 60a and 60b, and curved upper and lower portions 60c and 60d. One of the opposite side portions 60a and 60b, that is, the side portion 60b, provides the surface contact area S1 to be in surface contact with the heat transfer plate 59, so that heat from the refrigerant R is transferred to the heat transfer plate 59 via the surface contact area S1, as indicated by arrows in
The condensing pipe 60 is bent to have a zig-zag shape, and fixed to one surface of the heat transfer plate 59 by means of jigs or an adhesive T.
As shown in
The evaporating pipe 62 is directly attached to the outer side surfaces of the inner casing 54 by an adhesive T, while being covered by the insulator 64.
The surface contact area S2 of the evaporating pipe 62 extends in a longitudinal direction of the evaporating pipe 62.
The condensing pipe 60 has opposite flat side portions 62a and 62b, and curved upper and lower portions 62c and 62d. One of the opposite side portions 62a and 62b, that is, the side portion 62b, provides the surface contact area S2 to be in surface contact with the inner casing 54, so that heat from the inner casing 54 is transferred to the refrigerant R via the surface contact area S2, as indicated by arrows in
As shown in
The control unit 70 serves to turn on the compressor 56 when the temperature sensed by the temperature sensor 66 is not less than a first predetermined temperature, for example, 5° C., while turning off the compressor 56 when the sensed temperature is not more than a second predetermined temperature, for example, −30° C.
In
Now, operation of the refrigerator having the above described configuration according to the present invention will be described.
Heat from the inner casing 54 is transferred to the temperature sensor 66 via a contact area where the temperature sensor 66 is in contact with the inner casing 54. The temperature sensor 66 measures the temperature of the heat transferred thereto, and sends a signal representing the measured temperature to the control unit 70.
When the control unit 70 determines, based on the signal received thereto, that the temperature of the inner casing 54 is not less than the first predetermined temperature, for example, 5° C., it outputs an ON signal so as to operate the compressor 56.
In an ON state thereof, the compressor 56 compresses the refrigerant R into a high-temperature and high-pressure vapor state. The compressed refrigerant R is then introduced into the condensing pipe 60 of the condenser 58. The refrigerant R discharges heat therefrom into the heat transfer plate 59 via the surface contact area S1 in surface contact with the heat transfer plate 59 while passing through the condensing pipe 60, as indicated by the arrows in
At this time, the heat from the refrigerant R is rapidly transferred to the heat transfer plate 59 because the contact area between the heat transfer plate 59 and the condensing pipe 60 is large.
Subsequently, the refrigerant R condensed by the condenser 58 is subjected to a pressure reduction process while passing through the capillary tube 61, and then absorbing heat from the inner casing 54 while passing through the evaporator 62, so that it is evaporated. The resultant refrigerant is then introduced into the compressor 58. In such a manner, the refrigerant circulates.
During the compression, condensation, expansion, and evaporation of the refrigerant R carried out in the above described manner, the inner casing 54 discharges heat therefrom into the refrigerant R passing through the evaporating pipe 58, so that it is cooled. Accordingly, the interior of the storage compartment F is cooled by virtue of heat exchange performed between air present in the storage compartment F and the inner casing 54, and natural convection of the air in the storage compartment F.
As the inner casing 54 and storage compartment F are cooled in the above described manner, the heat from the inner casing 54 is rapidly transferred to the evaporating pipe 62 via the surface contact area S2 in surface contact with the inner casing 54, as indicated by the arrows in
As the inner casing 54 and storage compartment F are cooled in the above described manner, the heat from the inner casing 54 is also transferred to the temperature sensor 66 via the contact area where the temperature sensor 66 is in contact with the inner casing 54. The temperature sensor 66 measures the heat transferred thereto, and sends a signal representing the measured temperature to the control unit 70.
When the control unit 70 determines, based on the signal received thereto, that the temperature of the inner casing 54 is not more than the second predetermined temperature, for example, −30° C., it outputs an OFF signal to the compressor 58 so as to stop the operation of the compressor 58.
The interior of the storage compartment F is heated by heat penetrating into the storage compartment F through the insulator 64 and door 72 with the lapse of time, because the compressor 58 is maintained in its OFF state, and the low-temperature refrigerant is introduced into the compressor 56 no longer. Accordingly, the interior of the storage compartment F is not overcooled to a temperature not more than the second predetermined temperature, for example, −30° C.
Thereafter, the refrigerator repeats the turning on/off of the compressor 56 in accordance with the temperature sensed by the temperature sensor 66.
Referring to
The condenser 80 shown in
In this condenser 80, the flat portion 82b of the condensing pipe 82 provides a surface contact area S1 adapted to be in surface contact with the heat transfer plate 81.
Referring to
The condenser 90 shown in
Referring to
The evaporator shown in
In this evaporator, the flat portion 100a of the evaporating pipe 100 provides a surface contact area S2 adapted to be in surface contact with the inner casing 54. The remaining three flat portions 100b to 100d are surrounded by the insulator 64.
Referring to
The evaporator shown in
In this evaporator, the flat portion 110a of the evaporating pipe 110 provides a surface contact area S2 adapted to be in surface contact with the inner casing 54. The curved portion 110b is surrounded by the insulator 64.
In accordance with the evaporating pipe fixing method, a surface contact area adapted to come into contact with the inner casing 54 is first formed at one side portion of the evaporating pipe 62, that is, the side portion 62a, as shown in
The first step is carried out by preparing a hollow circular pipe for the evaporating pipe 62, and pressing the prepared hollow circular pipe in opposite lateral directions or in both opposite lateral directions and opposite vertical directions, thereby forming a flat portion for the surface contact area.
At a second step, an adhesive T is applied to the surface contact area of the evaporating pipe 62 (S2).
At a third step, the evaporating pipe 62 is extended along the outer side surfaces of the inner casing 54 such that it comes into close contact with the inner casing 54, thereby causing the surface contact area of the evaporating pipe 62 to be bonded to the inner casing 54, just after the application of the adhesive T at the second step (S3).
Thus, the evaporating pipe 62 is firmly fixed to the inner casing 54 in a state in which the surface contact area is in surface contact with the inner casing 54.
In accordance with the evaporating pipe fixing method, a surface contact area adapted to come into contact with the inner casing 54 is first formed at one side portion of the evaporating pipe 62, that is, the side portion 62a, as shown in
The first step is carried out by preparing a hollow circular pipe for the evaporating pipe 62, and pressing the prepared hollow circular pipe in opposite lateral directions or in both opposite lateral directions and opposite vertical directions, thereby forming a flat portion for the surface contact area.
At a second step, a release tape U coated with an adhesive T is attached to the surface contact area 62a of the evaporating pipe 62 after the first step (S12).
Preferably, the release tape U is made of a paper sheet or a synthetic resin film so that its attachment and detachment can be easily achieved.
Thus, the evaporating pipe 62 can be stored or transported in a state of being attached with the adhesive T and release tape U.
At a third step, the release tape U is separated from the evaporating pipe 62 such that the adhesive T is exposed. Thereafter, the evaporating pipe 62 is extended along the outer side surfaces of the inner casing 54 such that it comes into close contact with the inner casing 54, thereby causing the surface contact area of the evaporating pipe 62 to be bonded to the inner casing 54 (S13).
Thus, the evaporating pipe 62 is firmly fixed to the inner casing 54 in a state in which the surface contact area is in surface contact with the inner casing 54.
As apparent from the above description, the refrigerator having the above described configuration according to the present invention has an advantage in that since the inner casing is in surface contact with the evaporator adapted to cool the inner casing, it is possible to rapidly discharge heat from the inner casing through the region where the inner casing is in surface contact with the evaporator, so that the refrigerant exhibits an increased heat exchange performance, thereby rapidly cooling the storage compartment.
Since the evaporator is in surface contact with the inner casing, it does not have any non-contact portion, so that it is possible to minimize temperature dispersion in the storage compartment.
Also, the condenser included in the direct cooling type refrigerator according to the present invention includes a heat transfer plate, and a condensing pipe provided with a surface contact area adapted to be in surface contact with the heat transfer plate. Accordingly, the refrigerant exhibits an increased heat exchange performance, thereby rapidly cooling the storage compartment.
One evaporating pipe fixing method in the above described direct cooling type refrigerator according to the present invention involves the steps of forming, at the evaporating pipe, a surface contact area adapted to come into contact with the inner casing, applying an adhesive to the surface contact area of the evaporating pipe, and bringing the evaporating pipe into close contact with the inner casing sensor such that it is bonded to the inner casing at the surface contact area. In accordance with this evaporating pipe fixing method, it is possible to minimize temperature dispersion in the storage compartment. Also, there is an advantage in that the evaporating pipe is firmly fixed to the inner casing.
Another evaporating pipe fixing method in the above described direct cooling type refrigerator according to the present invention involves the steps of forming, at the evaporating pipe, a surface contact area adapted to come into contact with the inner casing, and attaching a release tape coated with an adhesive to the surface contact area of the evaporating pipe. Since the adhesive is protected by the release tape, it is possible to easily and conveniently store or transport the evaporating pipe. When the evaporating pipe is to be fixed, the release tape is separated from the evaporating pipe such that the adhesive is exposed. In this state, the evaporating pipe is brought into close contact with the inner casing such that it is bonded to the inner casing at the surface contact area. In accordance with this evaporating pipe fixing method, it is possible to minimize temperature dispersion in the storage compartment. Also, there is an advantage in that the evaporating pipe is firmly fixed to the inner casing.
Although the preferred embodiments of the invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2003-0005890 | Jan 2003 | KR | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 4204620 | Wurfel | May 1980 | A |
| 6253668 | Lee | Jul 2001 | B1 |
| 6619070 | Shin | Sep 2003 | B1 |
| Number | Date | Country |
|---|---|---|
| 1257816 | Jun 2000 | CN |
| 2001-0055658 | Jul 2001 | KR |
| 20-0240657 | Oct 2001 | KR |
| Number | Date | Country | |
|---|---|---|---|
| 20040144129 A1 | Jul 2004 | US |
