Refrigeration – Automatic control – Refrigeration producer
Reexamination Certificate
2001-08-09
2004-01-06
Tanner, Harry B. (Department: 3744)
Refrigeration
Automatic control
Refrigeration producer
C062S157000, C062S527000
Reexamination Certificate
active
06672089
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to refrigerator, and in particular to an apparatus and a method for controlling a refrigerating cycle of a refrigerator with a stepping motor valve.
2. Description of the Prior Art
Generally, a refrigerating apparatus adjusts a temperature by controlling a high temperature-high pressure refrigerant circulating in a refrigerating cycle of the refrigerating apparatus itself. Herein, the refrigerating apparatus can be a refrigerator and an air conditioner, etc.
Hereinafter, a refrigerator in accordance with the prior art will now be described with reference to the accompanying FIG.
1
.
FIG. 1
is a block diagram illustrating a refrigerating cycle of a refrigerator in accordance with the prior art.
As depicted in
FIG. 1
, a refrigerating cycle of a refrigerator in accordance with the prior art includes a compressor
11
compressing a refrigerant, a condenser
12
radiating heat of the refrigerant compressed in the compressor
11
, a drier
13
installed at the condenser
12
and removing moisture from the refrigerant, a refrigerant pipe connected to the drier
13
, a first and a second solenoid valves
14
,
15
connected to the refrigerant pipe and adjusting opening and shutting of the refrigerant pipe, a first and a second expansion valves
16
,
17
separately connected to the first and the second solenoid valves
14
,
15
and depressing the refrigerant discharged from the first and the second solenoid valves
14
,
15
, and a first and a second evaporators
18
,
19
separately connected to the first and the second expansion valves
16
,
17
and generating cold air in order to absorb heat of a foodstuff preserved in a chilling chamber or a freezing chamber. Herein, the first and the second evaporators
18
,
19
are connected to the compressor
11
through the refrigerant pipe. In more detail, the refrigerant cycle in accordance with the prior art is constructed in the order of the compressor
111
the condenser
12
<the drier
13
→the first and the second expansion valves
16
,
17
→the first and the second evaporators
18
,
19
→the compressor
11
. In addition, the compressor
11
, the condenser
12
, the drier
13
, the first and the second expansion valves
16
,
17
, the first and the second evaporator
18
,
19
, and the compressor
11
are connected through the refrigerant pipes.
In the meantime, when a plurality of the first and the second evaporators
18
,
19
are installed in the refrigerator, it is possible to control supply of the cold air inside the freezing chamber and the chilling chamber. In more detail, a refrigerating cycle can be constructed in the order of the compressor
11
the condenser
12
→the drier
13
→the first expansion valves
16
→the first evaporator
18
→the compressor
11
or the compressor
11
→the condenser
12
→the drier
13
→the second expansion valve
17
→the second evaporator
19
→the compressor
11
or the compressor
11
the condenser
12
→the first and the second expansion valves
16
,
17
→the first and the second evaporators
18
,
19
→the compressor
11
in accordance with opening and shutting operations of the first and the second solenoids valves
14
,
15
.
Accordingly, if a structure constructed with the first solenoid valve
14
, the first expansion valve
16
and the first evaporator
18
is for controlling the cold air inside the freezing chamber of the refrigerator, a structure constructed with the second solenoid valve
15
, the second expansion valve
17
and the second evaporator
19
is for controlling the cold air inside the chilling chamber of the refrigerator. Hereinafter, the refrigerating cycle of the refrigerator in accordance with the prior art will now be described with reference to the accompanying FIG.
2
.
FIG. 2
is a block diagram illustrating a microcomputer controlling the refrigerating cycle of the refrigerator in accordance with the prior art.
First, a microcomputer
21
recognizes a preset temperature of the chilling chamber and the freezing chamber of the refrigerator. The microcomputer
21
controls the refrigerating cycle for generating the cold air when the temperature of the chilling chamber and the freezing chamber is higher than the preset temperature.
The compressor
11
compresses the refrigerant so as to be a high temperature-high pressure refrigerant in accordance with control of the microcomputer
21
. The refrigerant compressed in the compressor
11
is discharged into the condenser
12
through the refrigerant pipe.
The condenser
12
radiates heat of the refrigerant flowed from the compressor
11
and discharges the refrigerant into the drier
13
.
The drier
13
removes humidity from the refrigerant passing through the condenser
12
and discharges it into the first and the second expansion valves
16
,
17
. Herein, the refrigerant passed through the drier
13
is discharged into the first
16
or the second expansion valve
17
when the first
14
or the second solenoid valve
15
is in the shutting state.
The first
14
and the second solenoid valve
15
are opened and shut in accordance with a control signal of the microcomputer
21
. In more detail, the microcomputer
21
detects a storage (freezing chamber or chilling chamber) required cold air by comparing the preset temperature with a present temperature of the freezing chamber or the chilling chamber and turns off the operation of the first
14
or the second solenoid valve
15
connected to the detected storage (freezing chamber or chilling chamber). For example, when the microcomputer
21
turns off only the operation of the first solenoid valve
14
, the refrigerant is discharged into the first evaporator
18
through the first expansion valve
16
. On the contrary, when the microcomputer
21
turns off only the second solenoid valve
15
, the refrigerant is discharged into the second evaporator
19
through the second expansion valve
17
.
Accordingly, the refrigerant is discharged into the first
16
or the second expansion valve
17
through the first
14
or the second solenoid valve
15
in accordance with the control of the microcomputer
21
.
The first and the second expansion valves
16
,
17
depress the high refrigerant passed through the first and the second solenoid valves
14
,
15
, adjust the refrigerant so as to flow as a certain ratio in order to make the refrigerant evaporate easily, and discharge the refrigerant to the first and the second evaporators
18
,
19
.
The first and the second evaporators
18
,
19
supply cold air to the freezing chamber and the chilling chamber in order to absorb heat inside the freezing chamber and the chilling chamber by being supplied the refrigerant through the first and the second expansion valves
16
,
17
.
Accordingly, the cold air absorbing the heat inside the freezing chamber and the chilling chamber is transformed into an evaporation state by the first and second evaporators
18
,
19
. The refrigerant transformed into the evaporation state flows into the compressor
11
. Accordingly, a refrigerating cycle is constructed as described above. Herein, the high pressure-high temperature refrigerant is converted into the low pressure-low temperature refrigerant and again it is converted into the high pressure-high temperature refrigerant while circulating in the refrigerating cycle. In more detail, the refrigerant inside the refrigerating cycle performs heat exchange while circulating in the condenser
12
and the first
18
or the second evaporator
19
.
In the meantime, in a case of a refrigerating cycle of a refrigerator constructed with the plurality of evaporators
18
,
19
, the refrigerating cycle is constructed through the first and the second solenoid valves
14
,
15
in an open state in accordance with a control signal of the microcomputer
21
, the refrigerating cycle is variously controlled in accordance with a temperature inside the freezing chamber and the chilling chamber. For example, when
Kim Jun Heon
Park Jin Su
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