Patent Publication Number: US-5154066-A

Title: Cooling a compressor and condenser of a refrigerator

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a cooling system for cooling a compressor and a condenser of a refrigerator. 
     2. Description of the Prior Art 
     Such refrigerators are disclosed, for example, in U.S. Pat. No. 4,089,187 of Frank A. Schumacher et al and Japanese patent laid-open publication No. sho 55-155170 of Yamazaki et al. 
     In that U.S patent there is discribed a condenser air flow system of a house-hold refrigerator having a compressor, a water evaporating pan and a fan arranged in a chamber located on the bottom of the refrigerator. 
     According to such a structure, the compressor is cooled or refrigerated by air received through an air inlet orifice which is formed on the front side of the chamber and then the condenser is cooled by ventilating the air by the fan through an exhaust aperture formed in a rear wall of the refrigertor and an air outlet orifice formed by the rear wall and a panel member. 
     Meanwhile, in the above-referenced Japanese patent laid-open publication there is described a structure shown in attached FIG. 1 wherein a body of a refrigerator is generally composed of an outer casing 2, a foamed heat-shield material 3 and an inner casing 4. A compressor 5, a condenser 17 and a pan 20 for receiving resultant water from a defrosting step are contained in a chamber 7 at the bottom of the body 1 of the refrigerator. The chamber 7, which has an air suction inlet 16, is formed by the bottom base 15 of the refrigerator body. 
     More particularly, a cover 10 is arranged which generally covers the entire rear panel 2a, the chamber 7, and a roof panel 2b of the refrigerator body. A duct 11 is disposed between the cover plate 10 and the panels 2a and 2b. With this structure, the air is received through the air suction inlet 16 on the bottom base 15 into the chamber 7 and then exchanges heat with the condenser 17 and the compressor 5. Then, the heat-changed air is advanced in the direction of arrows through the duct 11 and then ventilated through the outlet 13 formed on an upper and front area of the refrigerator. In this drawing, numerical reference number 9 is a door for opening and closing a front opening of an inner room or compartment 8 of the refrigerator, the inner room 8 being defined by the inner casing 4. 
     In the structure as described above, however, since the main condensing component of the whole condenser is provided on the rear panel 2a of the refrigeator body, it is impossible to obtain the cooling effect in a naturalistic circulation of ambient air, and since the compressor also is constructed so that it is to be cooled by a naturalistic circulation of ambient air, the cooling effect also is efficiently unobtainable. Accordingly, there have occured problems in that the operational effect of the compressor is reduced and the performance of the refrigerator also is deteriorated when the refrigerating load of the cold room and freezer room are increased because the rising temperature of the rear panel caused by heat-radiating of the condenser installed on the rear panel of the refrigerator body. 
     OBJECTS AND SUMMARY OF THE PREFERRED EMBODIMENTS OF THE INVENTION 
     Accordingly, the present invention has been made to avoid the above-mentioned problems of the prior art and it is an object of the present invention to provide a cooling system for cooling a compressor and a condenser of a refrigerator by of the forced circulation of ambient air in which the condenser, attached on the rear wall of the refrigerator body, can be cooled by air drawn-in by an outer fan disposed on a rotating shaft of a drive motor and the compressor can be cooled by the same air used to cool the condenser. 
     In order to acheive the above object, a cooling system for cooling a condenser and a compressor of a refrigerator according to the present invention preferably comprises dividing means for dividing the interior of the refrigerator into a freezer room and a cold room; and inner fan rotatably disposed on an inner rotating shaft of a drive motor and circulating the airflow cooled by the cooling means within the freezer room and the cold room; and compressing means for supplying a refrigerant to the cooling means. A condensing means has a circle-shaped upper end and a lower end fixed near the bottom of a rear wall of an outer casing. An outer fan is rotatably disposed on an outer rotating shaft of the drive motor; a rear cover forms a conduit whose upper side is circle-shaped and receives the loop-shaped end of the condensing means. A compressing means is disposed near a rear opening formed in the chamber formed on the bottom of the refrigerator. Ambient air is introduced through the circle-shaped opening by driving the outer fan and is then ventilated through the opening of the chamber so that the condensing means and the compressing means are sequentially cooled by the air. 
    
    
     BRIEF DISCRIPTION OF THE DRAWINGS 
     FIG. 1 is a vertical sectional view through a conventional refrigerator; 
     FIG. 2 is a schemtic, vertical sectional view of a refrigerator having a cooling system according to the present invention; and, 
     FIG. 3 is a schematic rear view of FIG. 2. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 2 and 3. 
     First, as shown in FIGS. 2 and 3, a body of the refrigerator is composed of an outer casing 32, a formed heat-shield material 39 and an inner casing 34, and the interior of the refrigerator is divided into a freezer room or space 35 and a cold space or room 36 by a dividing wall 40. Also, a cooler 37 of a cooling cycle is arranged in the dividing wall 40 and a chamber 33 is disposed on the bottom of the refrigerator body 30 and receives on its bottom a water evaporating pan 28 and the compressor 47. The chamber 33 is opened at its rear side and is closed up tightly at its front side by the front panel 31a which is formed integrally by a pressing step with a base plate 31. 
     Meanwhile, the condenser 48 is disposed in parallel to and on the rear wall 32a of the outer casing 32. This condenser 48 has one end provided with a loop-shaped preferably circle-shaped condensing component 50 having a plurality of refrigerating fins 51 and the other end is fixed to the rear wall 32a. Also, the rear wall 32a is provided with a rear cover 45 which by means of a fixing member 54 is spaced a predetermined distance away from the condenser 48. The rear cover 45 forms an air introducing conduit or duct 49 together with the rear wall 32a of the outer casing 32. The air introducing duct 49 is provided at its upper side with a circle-shaped opening 52 for introducing air by driving of an outer fan 59 which will be described below and the bottom of the rear cover 45 is disposed slightly upwardly relative to the upper side of the compressor 47 disposed at the rear side of the chamber 33. 
     Further, a drive motor 55 is arranged between the inner casing 34 and the outer casing 32, more particularly, between the cooler 37 and the condensing component 50. An inner fan 57 is disposed on the inner rotating shaft 56 of the motor 55, and this fan 57 acts such that most air cooled by the cooler can be circulated through a freezer room inlet 35a as shown by an arrow B so as to refrigerate the freezer room 35 and then returned to the cooler 37 through a freezer room outlet 35b formed on the dividing wall 40. Some air can be circulated through a cold chamber inlet 36a as shown by an arrow C so as to refrigerate the cold room 36 and then returned through a cold room outlet 36b formed on the dividing wall 40. Also, the outer rotating shaft 58 of the drive motor 55 is provided with an outer fan 59 which induces outer air to flow in the direction indicated by an arrow A. That air cools the condenser 48 arranged in parallel with the rear wall 32a of the outer casing 32 and then passes through a bottom rear opening so as to cool the compressor 47. In other words, the inner and outer rotating shafts 56 and 58 attached to the drive motor 55 are integrally formed with the same axis and the rotating shafts 56 and 58 are rotatably provided with the inner and outer fans 57 and 59 to be simultaneously rotated by the driving force of the drive motor 55. 
     In the drawing, numerical reference number 42 shows a freezer room door for opening and closing the freezer room 35, and 43 shows a cold room door for opening and closing the cold room 36. 
     Operation of the refrigeration system for cooling a condenser and a compressor of a refrigerator constructed as described above will be now described. 
     Firstly, most airflow cooled by the cooler 37 is directed to the freezer room 35 through the freezer room inlet 35a by the inner fan 57 rotatably disposed on the inner rotating shaft of the drive motor and circulated in the direction indicated by the arrow B to thereby refrigerate the freezer room 35. After that, the airflow flows through the freeze room outlet 35b into the cooler 37 to be cooled by the cooler 37. At that time, some airflow cooled by the cooler 37 is directed to the cold room 36 through the cold room inlet 36a by means of the inner fan 57 as described above and circulated in the direction indicated by the arrow C to refrigerate the cold room 36. After that, the airflow flows through the cold room outlet 36b into the cooler 37 and the airflow is again cooled by the cooler 37. 
     Accordingly, the airflow cooled by the cooler 37 is exhausted into the freezer room 35 and the cold room 36 so as to sequentially refrigerate the freezer and cold rooms 35 and 36 by rotating the inner fan 57 rotatably attached to the inner rotating shaft 56 in accordance with driving of the drive motor 55. Since the inner and outer shafts 56 and 58 of the drive motor 55 are integrally formed with the same axis, then by rotating of the outer fan 59 fixed to the outer rotating shaft 58, air is circulated through the circle-shaped opening 52 of the rear cover 45, the condensing component and the cooling fan 51 and passed through the air introducing duct 49 as shown by the arrow A to thereby cool the condenser 48 and the compressor 47 disposed near the rear opening of the chamber 33, and the airflow is eventually ventilated outwardly. 
     As described above, according to the cooling system for cooling a condenser and a compressor of refrigerators according to the invention, the system is constructed so that the rotating shafts are integral with the drive motor and positioned to the inner and outer sides of the refrigerator. The airflow cooled by the cooler is circulated in the freezer room and the cold room to refrigerate them by driving the inner fan fixed on the inner rotating shaft of the refrigerator. At the same time air is introduced into the upper side of the air introducing duct by the outer fan fixed in the outer rotating shaft to cool the condenser. After that, the airflow is downwardly forced-circulated to cool the compressor arranged in the chamber. Therefore, the structure of the system is very simple and the refrigerating effect is desirably improved because the airflow cooled by the cooler refrigerates the freezer room and the cold room and at that time the condenser and the compressor are cooled by using one motor, whereby the manufacturing cost can be considerably decreased. 
     Obviously, it is to be understood that the invention is not limited to the precise embodiment described with reference to the accompanying drawings and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention.