JPH08145524A - Refrigerator - Google Patents

Abstract

PURPOSE: To prevent discharged gas temperature from being raised in a refrigerator when a mixed refrigerant of an HCFC 22 system, etc., is used as a refrigerant. CONSTITUTION: There are provided a refrigerator body 1, a machine chamber 2 formed on a lower part of the back surface of the refrigerator 1, a compressor 3 disposed in the machine chamber 2, a compressor 3 cooling fan 4 disposed in the same machine chamber 2, a temperature detector 7 disposed on the surface of the compressor 3 on the opposite surface side of the same in close vicinity with the same, and control means 6 for operating the fan 4 when temperature of the temperature detector 7 is higher than a predetermined one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator, and more particularly to a refrigerator which prevents a rise in discharge gas temperature when an HCFC22-based mixed refrigerant or the like is used as the refrigerant.

[0002]

2. Description of the Related Art A conventional refrigerator will be described below with reference to FIG.

In FIG. 8, 1 is a refrigerator main body, and 2 is a machine room formed in the lower rear portion of the refrigerator main body. Reference numeral 3 is a compressor installed in the machine room, and 4 is a compressor cooling fan also installed in the machine room. A temperature detector 5 is provided on the front door of the refrigerator body 1, and a control means 6 is provided on the upper rear portion of the refrigerator body 1 to operate the fan 4 when the temperature of the temperature detector 5 is higher than a predetermined temperature. There is.

The operation of this conventional refrigerator will be described. It is known that when the outside air temperature rises, the discharge gas temperature inside the compressor 3 rises, which adversely affects the heat resistance reliability of the refrigerant and the refrigerating machine oil. Therefore, the temperature detector 5 provided on the front door of the refrigerator body 1 detects the outside air temperature around the refrigerator body 1, and the controller 6 operates the fan 4 when the outside air temperature is 25 ° C. or higher. By reducing the surface temperature of the compressor 3, the discharge gas temperature inside the compressor 3 is reduced, and the heat resistance reliability of the refrigerant and the refrigerating machine oil is ensured.

By the way, chlorofluorocarbon has excellent characteristics,
It has been used as a refrigerant, a foaming agent, a cleaning agent in the manufacturing process, and a propellant such as a spray in daily life. However, since it is a substance that destroys the ozone layer in the stratosphere, which plays an important role in absorbing harmful ultraviolet rays, it has become internationally regulated by the Montreal Protocol. 19
At the 4th Conference of the Parties to the Protocol, which was held in November 1992,
In 1996, it was decided to abolish specific CFCs.

Therefore, instead of the specified Freon CFC12 which has been used as the refrigerant of the refrigerator, the ozone depletion coefficient OD
The development of a refrigeration system using a mixed refrigerant mainly composed of HCFC22 having a small P, HFC134a, or the like is in progress.

[0007]

However, since the temperature detector 5 for determining the operation of the fan 4 is installed on the front door of the refrigerator body in the above-mentioned conventional structure, the refrigerator 1 is provided if the outside air temperature is the same. When the refrigerator 1 is installed with its surroundings open, and when the refrigerator 1 is installed with its surroundings shielded, the fan 4 is driven when the outside temperature reaches the same set temperature or higher.

Therefore, when the refrigerator 1 is installed so as to be shielded from the surroundings, the temperature inside the machine room 2 rises due to poor heat dissipation from the refrigerator even when the outside temperature is around 15 ° C, but at 25 ° C. Since it is below, the fan does not operate, and there is a problem that the temperature of the gas discharged from the compressor 3 becomes high.

Further, the conventional refrigerator is used and the refrigerant is CF
When C12 is changed to, for example, a mixed refrigerant mainly composed of HCFC22, since HCFC22 has a high compression ratio and a large specific heat ratio, the discharge gas temperature is 5 to 10 compared to CFC12.
There is a problem that the temperature rises.

An object of the present invention is to provide a refrigerator in which the discharge gas temperature is reduced and the reliability of the refrigeration system is improved when a new refrigerant such as a mixed refrigerant mainly composed of HCFC22 is adopted in the conventional refrigerator. To do.

[0011]

To achieve this object, a refrigerator according to the present invention comprises a refrigerator main body, a machine room formed in a lower rear portion of the refrigerator main body, a compressor installed in the machine room, and the same machine. A compressor cooling fan installed in the room, a temperature detector installed in close contact with the surface of the compressor opposite to the fan, and the fan is operated when the temperature of the temperature detector is higher than a predetermined temperature. It is composed of control means.

Further, a refrigerator main body including a freezing room and a refrigerating room, a machine room formed in a lower portion of the back surface of the refrigerator main body, a compressor installed in the machine room, and a surface of the compressor are closely attached. It comprises a temperature detector and a control means for raising the set temperature of the freezer compartment to a constant temperature when the temperature of the temperature detector is higher than a predetermined temperature.

Further, a refrigerator main body including a freezing room and a refrigerating room, a machine room formed in a lower rear portion of the refrigerator main body, a compressor installed in the machine room, and a surface of the compressor are closely attached. A temperature detector, and when the temperature of the temperature detector is higher than a predetermined temperature, raise the set temperature of the freezer room by a constant temperature,
When the temperature of the temperature detector does not drop after a predetermined time, it comprises a control means for further raising the set temperature of the freezer compartment to a constant temperature.

Further, a refrigerator main body including a freezing room and a refrigerating room, a machine room formed in a lower rear portion of the refrigerator main body, a compressor installed in the machine room, and a surface of the compressor are closely attached. A temperature detector, and when the temperature of the temperature detector is higher than a predetermined temperature, raise the set temperature of the freezer room by a constant temperature,
When the temperature of the temperature detector does not drop after a predetermined time, it comprises a control means for raising the set temperature of the refrigerating room to a constant temperature.

[0015]

With this structure, when the temperature of the compressor surface is directly detected and the fan is operated when the temperature is higher than the predetermined temperature, the machine room temperature becomes abnormally higher than the outside air temperature due to the installation environment of the refrigerator. Moreover, it is possible to reliably detect the rise in the compressor temperature, reduce the discharge gas temperature by the fan, ensure the heat resistance of the refrigerant and oil, and improve the reliability of the refrigeration system.

Further, when the temperature of the compressor surface is detected directly and the set temperature of the freezer compartment is raised to a certain temperature when the temperature is higher than a predetermined temperature, the compressor temperature of the compressor is increased when the discharge gas temperature becomes abnormally high. Since the operating rate is reduced and the discharge gas temperature is reduced, it is possible to secure the heat resistance of the refrigerant and the oil and improve the reliability of the refrigeration system.

Further, when the temperature of the compressor surface is detected directly and the set temperature of the freezer compartment is raised to a certain temperature when the temperature is higher than a predetermined temperature, if the discharge gas temperature becomes abnormally high, Reduce the operating rate. Then, when the temperature detector temperature, that is, the compressor temperature does not decrease after a predetermined time, the discharge gas temperature is surely reduced by further raising the set temperature of the freezer compartment to a constant temperature, and the heat resistance of the refrigerant and oil is secured. The reliability of the refrigeration system can be improved.

Further, when the temperature of the compressor surface is directly detected and the set temperature of the freezer compartment is raised to a certain temperature when the temperature is higher than a predetermined temperature, when the discharge gas temperature becomes abnormally high, Reduce the operating rate. When the temperature detector temperature, that is, the compressor temperature does not drop after a predetermined time, the discharge gas temperature is reliably reduced by raising the set temperature of the refrigerating chamber to a certain temperature, and the heat resistance of the refrigerant and oil is ensured and frozen. The reliability of the system can be improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

The external structure of the refrigerator shown in FIG. 1 differs from the conventional example in that the temperature detector 7 is installed in close contact with the surface of the compressor 3 opposite to the fan 4.

Next, the electric circuit shown in FIG. 2 will be described. 8 is a power outlet, and a normally open contact 1 of the relay 9
1 of the power transformer 12 in the control device (control means) 11 which is connected to the fan 4 via 0 and performs a series of refrigerator control.
The secondary side is connected. A power supply circuit 13 is connected to the secondary side of the power supply transformer 12. The control device 11
As an input to the fan 4 in the compressor 3
It has a temperature detector 7 provided in close contact with the surface on the opposite side.

The temperature detector 7 is an NTC thermistor and has a negative temperature characteristic in which the electric resistance decreases as the temperature of the object to be detected increases, and the electric resistance increases as the temperature decreases. One end of the temperature detector 7 is connected to the DC power supply Vcc, and the other end is grounded via the resistor R1 and is also connected to the input terminal a of the microcomputer 14.

The connection point of the resistors R2 and R3 is connected to the input terminal b of the microcomputer 14,
The other end of the resistor R2 is connected to the DC power supply Vcc, and the other end of the resistor R3 is grounded. The resistors R2 and R3
Generates a reference voltage corresponding to a preset temperature (for example, 100 ° C.) on the compressor surface at which the fan 4 starts to operate.

The output terminal c of the microcomputer 14 is connected via a buffer 15 to a relay 9 having a normally open contact 10.

The operation of the refrigerator configured as described above will be described. When the power of the refrigerator 1 is turned on, the compressor 3 starts operating, and when the freezer compartment 27 is cooled to the set temperature, the microcomputer 14 is activated by a signal from an inside temperature detector (not shown) in the freezer compartment 27. Stops the compressor 3. When the temperature in the freezer compartment 27 rises again, the operation of the compressor 3 is restarted by the in-compartment temperature detector.

However, by providing the temperature detector 7 in close contact with the surface of the compressor 3, the temperature of the surface of the compressor 3 is directly detected, and the temperature is a predetermined temperature (for example, 100 ° C.).
When the temperature is higher, the microcomputer 14 closes the normally open contact 10 of the relay 9 to operate the fan 4, cools the surface of the compressor 3, and reduces the discharge gas temperature.

As described above, according to this embodiment, the refrigerator 1
Even when the machine room temperature becomes abnormally higher than the outside temperature due to the installation environment, the temperature rise of the compressor 3 is surely detected,
Since the compressor 3 is cooled by the fan 4 to reduce the discharge gas temperature, the heat resistance of the refrigerant and the oil can be secured, and the reliability of the refrigeration system can be improved.

Further, since the temperature detector 7 is provided in close contact with the surface on the side opposite to the fan 4, it is difficult to be directly influenced by the air volume of the fan 4, and stable temperature detection can be performed.

In this embodiment, the temperature detector 7 is connected to the compressor 3
In the above, it was provided in close contact with the surface opposite to the fan 4,
The bottom surface of the compressor 3 or the discharge pipe of the compressor 3 may be used as long as the position is not directly affected by the air volume of the fan 4.

Next, a second embodiment of the present invention will be described with reference to the drawings. The external structure of the refrigerator is the first
This is the same as the embodiment, and the drawings and the detailed description thereof are omitted.

The electric circuit shown in FIG. 3 will be described. 8
Is a power outlet, to which the compressor 3 is connected via a normally-open contact 17 of a relay 16, and to which is connected a primary side of a power transformer 12 in a control device (control means) 11 that performs a series of refrigerator controls. A power supply circuit 13 is connected to the secondary side of the power supply transformer 12. The control device 11 has, as inputs, a temperature detector 7 provided on the surface of the compressor 3, a refrigerator temperature detector 18 provided in the freezer compartment 27, and a freezer compartment temperature setting switch 19.

The temperature detector 7 and the in-compartment temperature detector 18 are NTC thermistors and have a negative temperature characteristic in which the electric resistance decreases as the temperature of the object to be detected increases, and the electric resistance increases as the temperature decreases. are doing.

One end of the temperature detector 7 has a DC power source Vcc.
The other end is grounded via a resistor R1 and is also connected to the input terminal a of the microcomputer 14. One end of the inside temperature detector 18 has a DC power source V
cc, and the other end is grounded via a resistor R2 and is also connected to the input terminal b of the microcomputer 14.

Further, one end of the freezer compartment temperature setting switch 19 is connected to a DC power source Vcc, and the other end is a resistor R.
3 is grounded and the microcomputer 14
Is connected to the input terminal c.

The output terminal d of the microcomputer 14 is connected via a buffer 20 to a relay 16 having a normally open contact point 17.

The operation of the refrigerator configured as described above will be described with reference to the flowchart of FIG.

When the power of the refrigerator 1 is turned on, step 2
1, the temperature signal of the inside temperature detector 18 provided in the freezer compartment 27 is compared with the freezer compartment set temperature T1 set by the freezer compartment temperature setting switch 19, and the freezer compartment temperature is the set temperature T.
It is determined whether it is higher than 1. Freezer temperature is set value T1
If higher, go to step 22. H is output to the output terminal d of the microcomputer 14, the normally open contact 17 of the relay 16 is closed via the buffer 20, and the compressor 3 is turned off.
N and start cooling the inside.

Then, in step 23, it corresponds to the temperature signal of the temperature detector 7 provided on the upper surface of the compressor 3 and the upper limit value of the temperature of the gas discharged from the compressor necessary for ensuring the heat resistance reliability of the refrigerant and the refrigerating machine oil. Then, it is compared with a preset temperature T2 (for example, 100 ° C.) of the surface of the compressor 3 stored in advance in the microcomputer 14 to determine whether the surface temperature of the compressor 3 is higher than the preset temperature T2. Under normal use conditions,
Since the surface temperature of the compressor 3 is lower than the set temperature T2, the process returns from step 24 to step 21.

When the freezer compartment 27 is cooled to the set temperature T1, the process proceeds from step 21 to step 25, L is output to the output terminal d of the microcomputer 14, and the buffer 2
The normally open contact 17 of the relay 16 is opened via 0, and the compressor 3 is turned off. When the temperature in the freezing chamber rises again and becomes higher than the set value T1, the steps 21 to 2 are carried out again.
2, the compressor 3 is turned on, and cooling inside the refrigerator is started again. By repeating this operation, the temperature of the freezer compartment 27 is kept constant.

The refrigerant is changed from CFC12 to, for example, HCFC22.
When the mixed refrigerant mainly containing is used, the HCFC22 has a high compression ratio and a large specific heat ratio, so that the discharge gas temperature is CF
It is 5-10 ° C higher than C12. Furthermore, when the refrigerator 1 is installed with its surroundings shielded, or when a heat source such as a stove or a stove is placed in the immediate vicinity of the refrigerator 1, the temperature inside the machine room 2 rises and the discharge of the compressor 3 is increased. The gas temperature becomes higher.

At this time, the temperature signal of the temperature detector 7 provided on the surface of the compressor 3 corresponds to the upper limit value of the compressor discharge gas temperature for ensuring the heat resistance reliability of the refrigerant and the refrigerating machine oil in advance, and the microcomputer is used. When the temperature becomes higher than the set temperature T2 (for example, 100 ° C.) of the compressor surface stored in 14, the process proceeds from step 23 to step 26. Then, the freezer compartment setting temperature T1 is raised by a constant temperature (for example, 1 ° C). As a result, the operating rate of the compressor is lowered and the discharge gas temperature is lowered.

However, even if the set temperature in the freezer compartment is increased by 1 ° C, there is no practical problem in the freezing performance. Then step 26
Returns to step 21 again. In step 21, the temperature signal of the internal temperature detector 18 provided in the freezer compartment 27,
A comparison is made with a setting value which is 1 ° C. higher than the freezing chamber setting temperature T1 set by the freezing chamber temperature setting switch 19, and it is judged whether or not the freezing chamber temperature is higher than the setting temperature T1 + 1 ° C. If the freezer compartment temperature is lower than the set value T1 + 1 ° C, the routine proceeds to step 25, where the compressor is turned off.

As described above, according to this embodiment, the temperature of the compressor surface is directly detected, and when the temperature is higher than the predetermined temperature, the set temperature of the freezer compartment 27 is raised by a constant temperature.
When the discharge gas temperature becomes abnormally high, the operating rate of the compressor 3 is lowered to reduce the discharge gas temperature, so that the heat resistance of the refrigerant and the oil can be secured and the reliability of the refrigeration system can be improved.

Further, even if the set temperature in the freezer compartment is increased by 1 ° C., there is no problem in practical use as the refrigerating performance.

Next, a third embodiment of the present invention will be described with reference to the drawings. The external structure and electric circuit diagram of the refrigerator are the same as those of the first embodiment, and therefore the drawing and its detailed description are omitted.

The operation of the refrigerator configured as described above will be described with reference to the flowchart of FIG.

When the power of the refrigerator 1 is turned on, step 2
8, the temperature signal of the inside temperature detector 18 provided in the freezer compartment 27 is compared with the freezer compartment set temperature T1 set by the freezer compartment temperature setting switch 19, and the freezer compartment temperature is set to the set temperature T.
It is determined whether it is higher than 1. Freezer temperature is set value T1
If higher, go to step 29. H is output to the output terminal d of the microcomputer 14, the normally open contact 17 of the relay 16 is closed via the buffer 20, and the compressor 3 is turned off.
N and start cooling the inside.

Then, in step 30, it corresponds to the temperature signal of the temperature detector 7 provided on the upper surface of the compressor 3 and the upper limit value of the compressor discharge gas temperature necessary for ensuring the heat resistance reliability of the refrigerant and the refrigerating machine oil. Then, it is compared with a preset temperature T2 (for example, 100 ° C.) of the surface of the compressor 3 stored in advance in the microcomputer 14 to determine whether the surface temperature of the compressor 3 is higher than the preset temperature T2. Under normal use conditions,
Since the surface temperature of the compressor 3 is lower than the set temperature T2, the process returns from step 31 to step 28 again.

When the freezing chamber 27 is cooled to the set temperature T1, the process proceeds from step 28 to step 32, L is output to the output terminal d of the microcomputer 14, and the buffer 2
The normally open contact 17 of the relay 16 is opened via 0, and the compressor 3 is turned off. When the temperature in the freezing chamber rises again and becomes higher than the set value T1, the steps from step 28 to step 2 are performed again.
9, the compressor 3 is turned on and cooling of the inside of the refrigerator is started again. By repeating this operation, the temperature of the freezer compartment 27 is kept constant.

The refrigerant is changed from CFC12 to, for example, HCFC22.
When the mixed refrigerant mainly containing is used, the HCFC22 has a high compression ratio and a large specific heat ratio, so that the discharge gas temperature is CF
It is 5-10 ° C higher than C12. Furthermore, when the refrigerator 1 is installed with its surroundings shielded, or when a heat source such as a stove or a stove is placed in the immediate vicinity of the refrigerator 1, the temperature inside the machine room 2 rises and the discharge of the compressor 3 is increased. The gas temperature becomes higher.

At this time, the temperature signal of the temperature detector 7 provided on the surface of the compressor 3 corresponds to the upper limit value of the compressor discharge gas temperature for ensuring the heat resistance reliability of the refrigerant and the refrigerating machine oil, and the microcomputer is previously prepared. When it becomes higher than the compressor surface set temperature T2 (for example, 100 ° C.) stored in 14, the process proceeds from step 30 to step 33. Then, the freezer compartment setting temperature T1 is raised by a constant temperature (for example, 1 ° C). This allows
Reduce the compressor operating rate to lower the discharge gas temperature.

At the same time, the counting of time is started in step 34. This is because the freezer setting temperature T1 is set to a constant temperature (for example
° C) This is to count the elapsed time since the temperature was raised. In step 35, it is determined whether the predetermined time A has elapsed. If the predetermined time A has not elapsed, the process returns from step 35 to step 28 again.

If the predetermined time A has elapsed, step 3
From 5 to step 36, the temperature signal of the temperature detector 7 provided on the surface of the compressor 3 in step 36 and the upper limit value of the compressor discharge gas temperature necessary to secure the heat resistance reliability of the refrigerant and the refrigerating machine oil are set. Correspondingly, it is compared with a preset temperature T2 (for example, 100 ° C.) of the compressor surface stored in advance in the microcomputer 14, and the compressor surface temperature is set to the preset temperature T.
It is determined whether or not it has dropped below 2.

At this time, if the temperature signal of the temperature detector 7 is still higher than the compressor surface set temperature T2 (for example, 100 ° C.), the routine proceeds from step 36 to step 37. And
Set the freezing room temperature T1 to a more constant value (for example, 1 ° C)
increase. As a result, the operating rate of the compressor is further lowered and the discharge gas temperature is further lowered.

However, it has been confirmed that even if the set temperature in the freezer compartment is increased by 2 ° C., it does not pose a serious problem in terms of refrigeration performance in practical use.

The process returns from step 37 to step 28 again. In step 28, the temperature signal of the inside temperature detector 18 provided in the freezer compartment 27 and the freezer compartment temperature setting switch 1
It is determined whether or not the freezer compartment temperature is higher than the set temperature T1 + 2 ° C. by comparing it with the set value that is 2 ° C. higher than the freezer compartment set temperature T1 set in 9. If the freezer compartment temperature is lower than the set value T1 + 2 ° C., the process proceeds to step 32 and the compressor is turned off.

As described above, according to the present embodiment, the temperature of the compressor surface is directly detected, and when the temperature is higher than the predetermined temperature, the set temperature of the freezer compartment is raised by a constant temperature, whereby the discharge gas temperature becomes abnormal. If it becomes higher, reduce the operating rate of the compressor. When the temperature detector temperature, that is, the compressor temperature does not decrease after a predetermined time, the discharge gas temperature is reliably reduced by raising the set temperature of the freezing chamber to a certain temperature, and the heat resistance of the refrigerant and oil is ensured. The reliability of the system can be improved.

Next, a fourth embodiment of the present invention will be described with reference to the drawings. The external structure of the refrigerator is the first
This is the same as the embodiment, and the drawings and the detailed description thereof are omitted.

The electric circuit shown in FIG. 6 will be described. 8
Is a power outlet, to which the compressor 3 is connected through the normally open contact 17 of the relay 16, and the normally open contact 41 of the relay 40.
A damper control motor 42 for controlling the temperature of the refrigerating compartment is connected via the control unit (control means) 1 for performing a series of refrigerator control.
The primary side of the power transformer 12 in 1 is connected. A power supply circuit 13 is connected to the secondary side of the power supply transformer 12.

As inputs to the control device 11, a temperature detector 7 provided on the surface of the compressor 3, an inside temperature detector 18 provided in the freezing chamber, a freezing chamber temperature setting switch 19, and a refrigerating chamber are provided. It has an inside temperature detector 38 and a refrigerator temperature setting switch 39.

The temperature detector 7, the inside temperature detector 18,
The inside temperature detector 38 is an NTC thermistor, and has a negative temperature characteristic in which the electric resistance decreases as the temperature of the object to be detected increases, and the electric resistance increases as the temperature decreases.

One end of the temperature detector 7 has a DC power source Vcc.
The other end is grounded via a resistor R1 and is also connected to the input terminal a of the microcomputer 14. One end of the inside temperature detector 18 has a DC power source V
cc, and the other end is grounded via a resistor R2 and is also connected to the input terminal b of the microcomputer 14.

Further, one end of the freezer compartment temperature setting switch 19 is connected to the DC power source Vcc, and the other end is a resistor R.
3 is grounded and the microcomputer 14
Is connected to the input terminal c.

One end of the inside temperature detector 38 is connected to the DC power source Vcc, and the other end is grounded via the resistor R4 and is also connected to the input terminal d of the microcomputer 14. In addition, the freezer compartment temperature setting switch 3
One end of 9 is connected to the DC power supply Vcc, and the other end is grounded through the resistor R5 and is connected to the input terminal e of the microcomputer 14.

The output terminal f of the microcomputer 14 is connected via a buffer 20 to a relay 16 having a normally open contact 17, and the output terminal g is connected via a buffer 43 to a relay 40 having a normally open contact 41. Has been done.

The operation of the refrigerator configured as described above will be described with reference to the flowchart of FIG.

When the power of the refrigerator 1 is turned on, step 2
8, the temperature signal of the inside temperature detector 18 provided in the freezer compartment 27 is compared with the freezer compartment set temperature T1 set by the freezer compartment temperature setting switch 19, and the freezer compartment temperature is set to the set temperature T.
It is determined whether it is higher than 1. Freezer temperature is set value T1
If higher, go to step 29.

H is output to the output terminal d of the microcomputer 14, the normally open contact 17 of the relay 16 is closed via the buffer 20, and the compressor 3 is turned on to start cooling the inside of the refrigerator.

Then, in step 30, the temperature signal of the temperature detector 7 provided on the surface of the compressor 3 and the upper limit value of the compressor discharge gas temperature necessary for ensuring the heat resistance reliability of the refrigerant and the refrigerating machine oil are corresponded. Beforehand microcomputer 14
Compressor 3 surface setting temperature T2 (for example, 10
0 ° C.) to determine whether the surface temperature of the compressor 3 is higher than the set temperature T2. Since the surface temperature of the compressor 3 is lower than the set temperature T2 under normal use conditions, step 31
To step 28 again.

When the freezing chamber 27 is cooled to the set temperature T1, the process proceeds from step 28 to step 32, L is output to the output terminal d of the microcomputer 14, and the buffer 2
The normally open contact 17 of the relay 16 is opened via 0, and the compressor 3 is turned off. When the temperature in the freezing chamber rises again and becomes higher than the set value T1, the steps from step 28 to step 2 are performed again.
9, the compressor 3 is turned on and cooling of the inside of the refrigerator is started again. By repeating this operation, the temperature of the freezer compartment 27 is kept constant.

The refrigerant is changed from CFC12 to, for example, HCFC22.
When the mixed refrigerant mainly containing is used, the HCFC22 has a high compression ratio and a large specific heat ratio, so that the discharge gas temperature is CF
It is 5-10 ° C higher than C12. In addition, if the refrigerator is installed with its surroundings shielded, or if a heat source such as a stove or stove is placed near the refrigerator, the machine room 2
The internal temperature becomes higher, and the discharge gas temperature of the compressor 3 becomes higher.

At this time, the temperature signal of the temperature detector 7 provided on the surface of the compressor 3 corresponds to the upper limit value of the compressor discharge gas temperature for ensuring the heat resistance reliability of the refrigerant and the refrigerating machine oil, and the microcomputer is previously prepared. When the temperature becomes higher than the set temperature T2 (for example, 100 ° C.) of the compressor surface stored in 14, the process proceeds from step 30 to step 33. Then, the freezer compartment setting temperature T1 is raised by a constant temperature (for example, 1 ° C). As a result, the operating rate of the compressor is lowered and the discharge gas temperature is lowered.

However, even if the set temperature in the freezer compartment is increased by 1 ° C, there is no practical problem in the freezing performance. Step 34 at the same time
Start counting time with. This is the freezer setting temperature T1
This is to count the elapsed time after raising the temperature to a constant temperature (for example, 1 ° C). In step 35, it is determined whether the predetermined time A has elapsed.

If the predetermined time A has not elapsed, the process returns from step 35 to step 28.

If the predetermined time A has elapsed, step 3
From step 5 to step 36, the temperature signal of the temperature detector 7 provided on the upper surface of the compressor 3 in step 36 and the upper limit value of the compressor discharge gas temperature necessary for ensuring the heat resistance reliability of the refrigerant and the refrigerating machine oil In comparison with the compressor surface set temperature T2 (for example, 100 ° C.) stored in advance in the microcomputer 14 in correspondence with the above, it is determined whether or not the compressor surface temperature is lower than the set temperature T2.

At this time, if the temperature signal of the temperature detector 7 is still higher than the compressor surface set temperature T2 (for example, 100 ° C.), the routine proceeds from step 36 to step 44. And
The refrigerating room set temperature T3 is raised by a constant temperature (for example, 1 ° C).
As a result, the operating rate of the compressor 3 is further lowered and the discharge gas temperature is further lowered.

In step 45, the temperature signal of the inside temperature detector 38 provided in the refrigerating compartment is compared with the set value 1 ° C. higher than the refrigerating compartment set temperature T3 set by the refrigerating compartment temperature setting switch 39, and the refrigerating compartment temperature is compared. Is higher than the set temperature T3 + 1 ° C. If the refrigerating room temperature is lower than the set value T3 + 1 ° C, the process proceeds to step 46, L is output to the output terminal g of the microcomputer 14, the normally open contact 41 of the relay 40 is opened via the buffer 43, and the damper motor 4 is opened.
Turn OFF 2 and close the refrigerator damper.

However, it has been confirmed that even if the refrigerating room set temperature is raised by 1 ° C., there is a problem in practical use as refrigeration performance.

The process returns from step 46 to step 28 again, and a series of control is repeated. As described above, according to the present embodiment, the discharge gas temperature becomes abnormally high by directly detecting the temperature of the compressor surface and raising the set temperature of the freezer compartment to a constant temperature when the temperature is higher than the predetermined temperature. If this is the case, reduce the operating rate of the compressor. Then, when the temperature detector temperature, that is, the compressor temperature does not decrease after a predetermined time, the discharge gas temperature is surely reduced by raising the set temperature of the refrigerating room to a certain temperature, and the heat resistance of the refrigerant and the oil is ensured. The reliability of can be improved.

[0080]

As described above, the present invention comprises a refrigerator body,
A machine room formed in the lower rear part of the refrigerator body, a compressor installed in the machine room, a compressor cooling fan installed in the machine room, and a surface of the compressor opposite to the fan. By providing a temperature detector installed and control means for operating the fan when the temperature of the temperature detector is higher than a predetermined temperature, the temperature of the compressor surface is directly detected and when the temperature is higher than the predetermined temperature. By operating the fan, even when the temperature of the machine room becomes abnormally higher than the outside temperature due to the installation environment of the refrigerator, the rise of the compressor temperature is reliably detected and the discharge gas temperature is reduced by the fan to cool the refrigerator. The reliability of the system can be improved and its practical effect is great.

Further, a refrigerator main body including a freezing room and a refrigerating room, a machine room formed in a lower portion of the back surface of the refrigerator main body, a compressor installed in the machine room, and the compressor are closely attached to the surface of the compressor. By providing a temperature detector and a control means for raising the set temperature of the freezer room to a constant temperature when the temperature of the temperature detector is higher than a predetermined temperature, the temperature of the compressor surface is directly detected and the temperature is lower than the predetermined temperature. When the discharge gas temperature becomes abnormally high by raising the set temperature of the freezer room at a high temperature, the discharge gas temperature is reduced by lowering the operating rate of the compressor, ensuring the heat resistance of the refrigerant and oil. The reliability of the refrigeration system can be improved, and its practical effect is great.

Further, a refrigerator main body including a freezing room and a refrigerating room, a machine room formed in a lower part of the back surface of the refrigerator main body, a compressor installed in the machine room, and a surface of the compressor are closely attached. A temperature detector, and when the temperature of the temperature detector is higher than a predetermined temperature, raise the set temperature of the freezer room by a constant temperature,
When the temperature detector temperature does not drop after a predetermined time, by providing a control means for further raising the set temperature of the freezer compartment to a constant temperature, the temperature of the compressor surface is directly detected, and when the temperature is higher than the predetermined temperature, it is frozen. By raising the set temperature of the chamber to a constant temperature, the operating rate of the compressor is lowered when the discharge gas temperature becomes abnormally high. Then, when the temperature detector temperature, that is, the compressor temperature does not decrease after a predetermined time, the operating temperature of the compressor is further reduced by increasing the set temperature of the freezing chamber to a certain temperature, and the discharge gas temperature is surely reduced. The heat resistance of the oil can be secured and the reliability of the refrigeration system can be improved, and its practical effect is great.

Further, a refrigerator main body including a freezing room and a refrigerating room, a machine room formed in a lower portion of the back surface of the refrigerator main body, a compressor installed in the machine room, and a surface of the compressor are closely attached. A temperature detector, and when the temperature of the temperature detector is higher than a predetermined temperature, raise the set temperature of the freezer room by a constant temperature,
When the temperature of the temperature detector does not drop after a predetermined time, by providing a control means for raising the set temperature of the refrigerating room to a constant temperature, the temperature of the compressor surface is directly detected and the freezing room when the temperature is higher than the predetermined temperature. When the discharge gas temperature becomes abnormally high, the operating rate of the compressor is lowered by raising the set temperature of the constant temperature. Then, when the temperature detector temperature, that is, the compressor temperature does not decrease after a predetermined time, the operating temperature of the compressor is further reduced by raising the set temperature of the refrigerating chamber to a certain temperature, and the discharge gas temperature is surely reduced, and the refrigerant and oil are cooled. The heat resistance of the refrigeration system can be ensured and the reliability of the refrigeration system can be improved, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a rear view of a refrigerator according to a first embodiment of the present invention.

FIG. 2 is an electric circuit diagram of the device.

FIG. 3 is an electric circuit diagram of a second embodiment of the present invention.

FIG. 4 is an operation flowchart of the device.

FIG. 5 is an operation flowchart of the third embodiment of the present invention.

FIG. 6 is an electric circuit diagram of a fourth embodiment of the present invention.

FIG. 7 is an operation flowchart of the device.

FIG. 8 is a rear view of a conventional refrigerator.

[Explanation of symbols]

 1 Refrigerator main body 2 Machine room 3 Compressor 4 Fan 6 Control means 7 Temperature detector

Claims (4)

[Claims] 1. A refrigerator main body, a machine room formed in a lower portion of the back surface of the refrigerator main body, a compressor installed in the machine room, a compressor cooling fan also installed in the machine room, and the fan of the compressor. A refrigerator comprising a temperature detector installed in close contact with the surface on the opposite side, and a control means for operating the fan when the temperature of the temperature detector is higher than a predetermined temperature. 2. A refrigerator main body including a freezer compartment and a refrigerating compartment, a machine room formed in a lower rear portion of the refrigerator main body, a compressor installed in the machine room, and a compressor room closely attached to the surface of the compressor. A refrigerator comprising a temperature detector and control means for raising the set temperature of the freezer compartment to a constant temperature when the temperature of the temperature detector is higher than a predetermined temperature. 3. A refrigerator main body including a freezer compartment and a refrigerating compartment, a machine room formed in a lower rear portion of the refrigerator main body, a compressor installed in the machine room, and a compressor room closely attached to the surface of the compressor. When the temperature of the temperature detector and the temperature detector is higher than a predetermined temperature, the set temperature of the freezer compartment is raised by a constant temperature, and when the temperature of the temperature detector does not drop after a predetermined time, the set temperature of the freezer compartment is raised by a constant temperature. Refrigerator composed of control means. 4. A refrigerator main body including a freezer compartment and a refrigerating compartment, a machine room formed in a lower part of the back surface of the refrigerator main body, a compressor installed in the machine room, and a compressor room installed in close contact with the surface of the compressor. Control for raising the set temperature of the temperature detector and the freezer compartment to a constant temperature when the temperature of the temperature detector is higher than a predetermined temperature, and raising the set temperature of the refrigerating compartment to a constant temperature when the temperature detector does not drop after a predetermined time. A refrigerator composed of means and means.