JP2000213847A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set the operating rate of a compressor constantly at a specified ideal value by controlling the r.p.m. of the compressor such that the time between start and stop of the compressor is specified. SOLUTION: A control means 2 comprising a microcomputer controls the r.p.m. of a compressor 4 within a specified range and an inner temperature detector 3 detects the inner temperature every specified time. The compressor 4 is subjected to start/stop control based on the detected inner temperature thus sustaining the inner temperature at a specified set level. The time between start and stop of the compressor 4 is specified and the compressor 4 is operated only during the specified time thus controlling the r.p.m. of a compressor 4. According to the arrangement, operating rate of the compressor 4, i.e., the value of operating time ÷ (operating time + stopping time) during one start/ stop cycle, can be set constantly at an ideal value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator provided with means for controlling the number of revolutions of a compressor.

[0002]

2. Description of the Related Art A conventional refrigerator of this kind is disclosed in
As disclosed in Japanese Patent No. 26618, the refrigerator includes a variable-speed drive compressor, a freezer temperature detection circuit for detecting the temperature in the freezer, and a variable-speed drive fan. There is a refrigerator provided with control means for changing the number of revolutions of the compressor and the blower in a stepwise manner in accordance with a refrigeration load by an output of a circuit.

[0003]

SUMMARY OF THE INVENTION The above-mentioned JP-A-9-12
The refrigerator disclosed in Japanese Patent No. 6618 operates a compressor at a minimum necessary number of revolutions according to a load.
When the compressor is operated at the required minimum number of revolutions, it takes too long operation time to cool the freezer temperature to the predetermined temperature, and the heat radiation from the condensing pipe for the refrigeration cycle attached to the inner surface of the cabinet is In some cases, the time to enter the refrigerator is as long as the operation time of the compressor, so that the amount of heat entering from the condensing pipe increases, resulting in a problem that the refrigerator has poor cooling efficiency. In addition, since the operation time is long, there is also a problem that a troublesome operation sound of a compressor or the like that causes noise is heard for a long time.

[0004]

The refrigerator according to the present invention has solved the above-mentioned problems.
A rotational speed control means for controlling the rotational speed of the compressor within a predetermined range; and an internal temperature detecting means for detecting an internal temperature at predetermined time intervals, wherein the internal temperature detected by the internal temperature detecting means is provided. By controlling the operation / stop of the compressor according to the internal temperature, in a refrigerator in which the internal temperature is maintained at a predetermined set temperature, the time from start to stop of the compressor is set to a predetermined time. And a control means for controlling the number of revolutions of the compressor. With this configuration, the operation time from start to stop of the compressor is controlled stably within a set predetermined time. Therefore, the value of the compressor operation rate (during one operation / stop cycle: operation time / (operation time + stop time)) can always be set to an ideal predetermined value. Of cooling efficiency in consideration of There refrigerator is obtained.

The invention according to a second aspect of the present invention includes a rotational speed control means for controlling the rotational speed of the compressor within a predetermined range, and an internal temperature detecting means for detecting the internal temperature at predetermined time intervals. By controlling the operation and stop of the compressor according to the internal temperature detected by the internal temperature detecting means, in a refrigerator in which the internal temperature is maintained at a predetermined set temperature, The compressor is operated continuously at a predetermined rotation speed for a predetermined time, and when the value detected by the internal temperature detecting means has not reached the stop set temperature for stopping the compressor, the compression is continued until the stop set temperature is reached. The rotation speed of the compressor is provided with control means for setting the rotation speed of the compressor to be gradually increased by a predetermined increase rotation speed from the predetermined rotation speed for each additional operation time having a predetermined interval. To do
With this configuration, even when the load increases, the internal temperature can reach the set temperature in a time as close as possible to the predetermined time with the rotational speed of the compressor as small as possible, and the load does not change under different load conditions of the refrigerator. Efficient operation rate control is achieved, and a refrigerator with high cooling efficiency that takes into account the intrusion of condensation heat by the refrigeration cycle regardless of load conditions can be obtained.

According to a third aspect of the present invention, the compressor is operated, and after the internal temperature reaches the stop set temperature within a predetermined range of time relative to the predetermined time or a time exceeding the predetermined time. Control means for stopping the compressor, and thereafter operating the compressor at the rotation speed of the compressor immediately before stopping the compressor when the temperature in the refrigerator becomes equal to or higher than the operation set temperature for operating the compressor. With this configuration, it is possible to start from the beginning of the next operation at the number of rotations of the compressor when the set temperature is reached after the set time is reached for the predetermined time or more, without waste. The operation starts in consideration of efficient operation rate control of the compressor, and a refrigerator that can operate with high cooling efficiency in consideration of intrusion of condensation heat by the refrigeration cycle is obtained.

According to a fourth aspect of the present invention, the compressor is operated, and the compressor is stopped after the internal temperature reaches the stop set temperature in a time shorter than a predetermined range of the predetermined time. Then, when the temperature in the refrigerator becomes equal to or higher than the operation set temperature, the control means for operating the compressor at a reduced rotation speed lower by a predetermined rotation speed than the rotation speed of the compressor immediately before stopping the compressor. With this configuration, with the configuration, it is possible to start from the beginning of the next operation at a rotation speed lower than the rotation speed of the compressor when the stop set temperature is reached within the set predetermined time, The compressor can be operated close to the above-mentioned predetermined time without using the compression function more than necessary, and a refrigerator having improved cooling efficiency in consideration of intrusion of condensation heat by the refrigeration cycle can be obtained.

Further, the invention according to claim 5 is characterized in that the predetermined time is switched to a different time by a switching means, and with this configuration, the predetermined time is reduced by the heat of condensation by the refrigeration cycle. If switching can be performed for a long time within a range of high cooling efficiency taking into account intrusion, the range of response capacity when the load increases becomes narrower, but the compressor capacity can be increased without using the compression function more than necessary. The operation efficiency of the refrigerator is improved, and a refrigerator with higher cooling efficiency can be obtained in consideration of the intrusion of heat of condensation by the refrigeration cycle.

Further, the invention set forth in claim 6 is characterized in that the stop set temperature and the operation set temperature are switched to different temperatures by a switching means, and with this configuration, the operation temperature and the stop are set. If the set temperature can be switched to a high temperature that does not hinder freezing and preservation, less power is required for cooling, and the temperature difference from the outside air is reduced, reducing the amount of heat absorbed from the outside air. As a result, heat loss can be reduced, and a more efficient and labor-saving refrigerator can be obtained.

According to a seventh aspect of the present invention, the value such as the predetermined time or the set temperature switched by the switching means performs a door opening / closing operation. Even if the temperature inside the refrigerator rises due to the door opening / closing operation, the operation returns to the normal operation, so that the stored items in the refrigerator are always kept at a temperature suitable for storage.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a refrigerator according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a control device showing an embodiment of a refrigerator of the present invention, FIG. 2 is a side sectional view showing an embodiment of a refrigerator of the present invention, and FIG. 3 is an embodiment of a refrigerator of the present invention. It is a flowchart figure of the control apparatus which shows this.

In FIG. 1, reference numeral 1 denotes a refrigerator control device.
The control unit 2 (for example, a microcomputer) receives the internal temperature detection device 3. The output of the control means 2 is connected to a driving means 5 for operating the compressor 4 and a driving means 7 for operating the blower 6 in the refrigerator. The control means 2 includes a mode switching device 8 for switching according to the purpose of use, an F (freezing) door opening / closing sensing device 9 for sensing the opening / closing of each door of a freezing room or a refrigerator, and
(Refrigerated) door open / close sensing devices 10 are connected respectively.

In FIG. 2, reference numeral 11 denotes a refrigerator main body,
The partition 12 is divided into a freezer compartment 13 at the upper part and a refrigerator compartment 14 at the lower part. Reference numeral 15 denotes a machine room in which the compressor 4 is provided. Reference numeral 16 denotes a discharge pipe of the compressor 4.

A condenser 17 is provided inside the outer wall of the refrigerator main body 11. Reference numeral 18 denotes a cooler, and a defrosting device 19 such as a glass tube heater or the like is provided below, and an in-compartment blower 6 is provided above. Reference numeral 20 denotes a suction pipe of the compressor 4. The compressor 4, discharge pipe 16, condenser 17, capillary tube (not shown), cooler 18, and suction pipe 20 constitute a series of refrigeration cycles.

Reference numeral 21 denotes an evaporator cover having an orifice portion 21a of the fan 6a in the internal blower 6 and a heat insulating portion 21b for covering the cooler 18. A fan louver 22 has a discharge hole 22a in front of the fan 6a.
2 has a suction hole 22b below. Eva cover 21
And fan louver 22 are combined to form an EVA cover assembly 2
It becomes 3. The evaporator cover assembly 23 composed of the evaporator cover 21 and the fan louver 22 forms a pressure chamber 23a and a cover duct portion 23b (indicated by a dotted line) communicating downward from a part thereof.

The cool air cooled by the cooler 18 is sent to the pressure chamber 23a by the fan 6a of the internal blower 6, and is discharged to the freezing chamber 13 through the discharge hole 22a. Thereafter, the cool air in the freezing room 13 cools the inside, returns to the lower part of the cooler 18 through the suction hole 22b, and forms a cool air circuit of the freezing room 13. A part of the cool air sent to the pressure chamber 23a passes through the cover duct 23b, and is discharged to the refrigerator compartment 14 through a partition cool air duct 12a (indicated by a dotted line) provided in a part of the partition 12. Thereafter, the cool air in the refrigerator compartment 14 cools the inside, returns to the lower part of the cooler 18 through the modular duct 12b of the partition 12, and forms a cool air circuit of the refrigerator compartment 14.

The heat in the refrigerator absorbed by the cooler 18 is released to the outside through the outer wall by the condenser 17 provided on the outer wall of the refrigerator main body 11. In addition, refrigerator room 1
In order to more appropriately adjust the temperature of 4,
A damper may be provided at a portion where the cold air is discharged to the refrigerator compartment 2a, and the temperature of the refrigerator compartment 14 may be adjusted by opening and closing the damper.

The inside temperature detecting device 3 is mounted inside the freezing room 13, and the mode switching device 8 is mounted inside the freezing room 14. Further, a control device 1 constituting an electric circuit of the present invention is attached to a back surface of the refrigerator main body 11.

A freezer compartment door 24 is provided in front of the partition 12.
There is provided an F door opening / closing sensing device 9 for sensing the opening / closing of an R door and an R door opening / closing sensing device 10 for sensing the opening / closing of the refrigerator compartment door 25. Therefore, the freezer compartment door 24 or the refrigerator compartment door 25
When the door is opened, the opening / closing of the door is sensed by the F door opening / closing sensor 9 and the R door opening / closing sensor 10, and the information is stored in the control means 2 with time.

Next, the operation of the refrigerator of the present invention will be described with reference to the flowchart shown in FIG.

First, when the power is turned on, the control means 2 comprising a microcomputer is returned to an initial state, and the process proceeds to step S1.

Thereafter, in step S1, it is determined in the control means 2 whether or not the operation mode is set to mode A. If the operation mode is not set to mode A by the mode switching device 8, the operation proceeds to step S2. In the setting of the normal operation mode, the setting of the internal temperature at which the operation is started is set to the operation set temperature T1 = T1 (for example, T1 = -16 ° C.), and the basic compressor rotation speed at the start of the operation is set to N1 = N1 (for example, N1 = 24
00 rpm), the lower limit of the continuous operation time for determining whether or not the rotation speed of the compressor needs to be changed is set to the lower limit operation time M1 = M1 (for example, M1
1 = 38 minutes), setting of the internal temperature for stopping the operation is stopped. Set temperature T2 = T2 (for example, T2 = −20 ° C.), and the upper limit of the continuous operation time for judging whether the rotation speed of the compressor needs to be changed is set as the upper limit. The operation time M2 = M2 (for example, M2 = 40 minutes), and the compressor upper limit rotational speed is set to NM = NM (for example, NM = 3000 rpm)
m), the additional operation time of the operation time of increasing the rotation speed of the compressor by a predetermined rotation speed is set to M3 = M3 (for example, M3 = 10
Minutes).

Then, in step S3, the internal temperature of the freezer compartment 13 detected by the internal temperature detecting device 3 and the operation set temperature T1
Is compared with the operation set temperature T1.
If it is higher than (for example, T1 = −16 ° C.), the process proceeds to step S4, and it is determined in step S4 whether the flag Fa = 1. When the flag Fa is not 1 in step S4 (when the refrigerator is operated for the first time after being connected to the power supply), the compressor 4 is driven by the driving means 5 at step S5 at the basic compressor rotation speed N1 (for example, N1 = 2400 rpm). Drive.

Thereafter, at step S6, the flag Fa = 1.
In step S7, the counter Ma for counting the operation time starts counting. Next, in step S8, it is determined whether or not the counter Ma has become Ma = M1.
If not = M1, in step S9, the temperature in the freezing compartment 13 detected by the temperature detecting device 3 in the refrigerator and the stop set temperature T2
And the temperature in the freezer 13 is set to the stop set temperature T2.
(For example, T2 = −20 ° C.), the compressor
The process proceeds to step S8 in the N state.

Thereafter, when the temperature in the freezer compartment 13 is higher than the set stop temperature T2, the counter Ma counts Ma = M
The above step S until M1 (for example, M1 = 38 minutes) is reached.
8 and step S9 are repeated, and when Ma = M1, the process proceeds to step S10.

When the temperature in the freezing compartment 13 reaches the stop set temperature T2 (for example, T2 = -20 ° C.) in step S10, the current rotational speed of the compressor 4 is stored in step S11 in a storage rotational speed NR (in this case, NR = NR). N1 = 2400 rpm), the count of the counter Ma is stopped in step 12, the compressor 4 is stopped in step S13, and the process proceeds to step S1.
Return to

From the viewpoint of the operating efficiency of the compressor 4 alone, it is better to cool the compressor 4 for a long time at the required minimum number of revolutions, but the compressor 4 is operated to operate the refrigerator 1
When the heat inside the refrigerator is radiated to the outside through the outer wall by the condenser 17 provided on the outer wall of the first unit, a part of the heat radiated enters the inside of the refrigerator by heat conduction. In view of the cooling efficiency of the entire refrigerator in consideration of the intrusion of the compressor, it is better to start and stop the compressor at appropriate time intervals and rotation speeds.

That is, in the above operation, if the stop time of the compressor 4 is 16 minutes and the operation time of the compressor 4 is M1 = 38 minutes, the operation rate of the compressor 4 is 38 ÷ (38 + 16) ×
It is calculated from 100 and becomes approximately 70%. The value of the operation rate of the compressor 4 = 70% is a value with a considerably high cooling efficiency in consideration of the intrusion of the condensing heat due to the refrigeration cycle, and the operation rate in actual use in consideration of the increase and decrease of the load. A value around 70% is desirable.

After returning to step S1, when the operation mode is not mode A, the set values are set in the same manner as described above in step S2, and in step S3, the temperature in the freezing compartment 13 is set to the operation set temperature T1 (for example, T1 = -16). ° C) or more, the process proceeds to step S4. In step S4, since Fa = 1 this time, the process proceeds to step S14. In step S14, the previously stored rotation speed NR (in this case, NR = 2400 rpm).
The operation of the compressor 4 is started.

Therefore, the compressor can be operated from the beginning at the rotation speed of the compressor in which the temperature in the refrigerator can reach the stop set temperature (for example, T2 = −20 ° C.), and the operation starts in consideration of efficient and efficient operation rate control. A refrigerator capable of operating with high cooling efficiency in consideration of the intrusion of heat of condensation by the refrigeration cycle can be obtained.

When the compressor 4 is operating and the temperature in the freezer compartment 13 does not drop to the stop set temperature T2 (for example, T2 = −20 ° C.) in step S10, the process proceeds to step S15, where the counter Ma sets Ma = M2. (For example, M2 = 40 minutes)
Then, if the temperature in the freezer 13 detected in step S16 is the stop set temperature T2 (for example, T2 = -20 ° C.), the process proceeds to step S11, where the current rotational speed of the compressor 4 is stored, and thereafter, the same as above. Steps.

Therefore, in the above case, the compressor can be operated from the beginning at the number of revolutions of the compressor at which the internal temperature reaches the set stop temperature (for example, T2 = -20 ° C.), and the operation is performed in consideration of efficient and efficient operation rate control. Starts, and a refrigerator that can operate with high cooling efficiency in consideration of the intrusion of condensation heat by the refrigeration cycle is obtained.

The compressor 4 is operated at a rotational speed different from the basic compressor rotational speed N1 (for example, N1 = 2400 rpm), and the temperature in the freezing compartment 13 is reduced to the set stop temperature T2 at step S10 or S16. (For example, T2 = -20
° C), the current rotational speed of the compressor 4 at that time is stored as the stored rotational speed NR in step S11, and immediately after that, in step S14, the compressor is operated at the above-mentioned stored rotational speed NR, and the same effect as described above is obtained. Is obtained.

Further, the temperature inside the freezer compartment 13 detected in step S16 becomes the stop set temperature T2 (for example, T2 = −20).
° C), the flow proceeds to step S17 to stop counting by the counter Ma, and in step S18, the rotation speed of the compressor 4 is set to the compressor upper limit rotation speed NM (for example, NM = 300).
It is determined whether or not the rotational speed is 0 rpm), and if the rotational speed is not at the compressor upper limit rotational speed NM, the rotational speed is increased again by a predetermined increase rotational speed (for example, 100 rpm) to the current rotational speed in step S19. In step S20, the rotation speed of the compressor is increased to the predetermined rising rotation speed (for example, 100 rpm).
pm), the operating time of the compressor 4 after being increased by
The count is started by the counter Mb.

Thereafter, at step S21, the counter Mb
Is determined to be the additional operation time of Mb = M3 (for example, M3 = 10 minutes), and if not, the process proceeds to step S22. If the temperature in the freezer compartment 13 has not reached the stop set temperature T2 (for example, T2 = −20 ° C.) in step S22, the process proceeds to step S21, and the process proceeds to step S21 or S21.
At 22, the counter Mb is set to Mb = M3 or
The above steps are repeated until the internal temperature reaches the stop set temperature T2.

In step S21, the counter Mb is set to Mb =
When M3 (for example, M3 = 10 minutes) is reached, the process proceeds to step S23. If the temperature in the freezing compartment 13 is not at the stop set temperature T2 (for example, T2 = −20 ° C.) in step S23, the process returns to step S17, and the counter Mb is reset. The counting is stopped, and until the temperature in the freezing compartment 13 reaches the stop set temperature T2.
The rotation speed of the compressor 4 is NM (for example, N
The rotation speed of the compressor 4 is increased by a predetermined increase rotation speed (for example, 100 rpm) every predetermined additional operation time (for example, M3 = 10 minutes) within a range of not more than (M = 3000 rpm) and the steps S17 to S23 are performed. Repeated.

In step S22 or S23, the temperature in the freezing compartment 13 is reduced to the stop set temperature T2 (for example, T2 = −20).
° C), the process proceeds to step S24, and step S24
, The current rotational speed of the compressor 4 after the increase is stored in the stored rotational speed N
R is stored, the count of the counter Mb is stopped in step S12, the compressor is stopped in step S13, and the process returns to step S1.

For this reason, the internal temperature is set to the stop set temperature (for example, T2 = 40 minutes) at a time as short as possible to the above-mentioned predetermined time (for example, M2 = 40 minutes) at a minimum rotational speed of the compressor.
(−20 ° C.), efficient operation rate control that does not change under different load conditions of the refrigerator, and a refrigerator with high cooling efficiency that takes into consideration the intrusion of condensation heat by the refrigeration cycle regardless of the load condition is obtained.

The rotational speed at the start of the operation of the compressor 4 in step S14 immediately after that is the stored rotational speed NR after the increase stored in step S24. Therefore, in the next operation of the compressor 4, the internal temperature is set to the stop set temperature (for example, T2 = −20) with the rotation speed of the compressor as small as possible and in a time as close as possible to the predetermined time (for example, M2 = 40 minutes).
° C), the operation can be started from the beginning with the above-mentioned number of rotations of the compressor, the operation starts in consideration of efficient and efficient operation rate control, and the operation with high cooling efficiency in consideration of the intrusion of condensation heat by the refrigeration cycle. A refrigerator that can be used is obtained.

In step S8, the counter Ma
Is a value up to Ma = M1 (for example, M1 = 38 minutes), and if the temperature in the freezer 13 reaches the stop set temperature T2 (for example, T2 = −20 ° C.) in step S9, the rotation at that time is made in step S25. A predetermined rotation speed (for example, 100 r
pm) is stored as the storage rotation speed NR, the count of the counter Ma is stopped in step S12, the compressor is stopped in step S13, and the process proceeds to step S13.
Return to 1.

The rotational speed at the start of operation of the compressor in step S14 immediately after that is the stored rotational speed NR after the decrease stored in step S25. Therefore, the compressor can be operated from the beginning at a rotation speed lower than the rotation speed of the compressor when the stop set temperature (eg, T2 = −20 ° C.) is reached in less than the set predetermined time (eg, M1 = 38 minutes). The compressor can be operated close to the above-mentioned predetermined time without using the compression function power, and a refrigerator which can operate with improved cooling efficiency in consideration of the intrusion of condensation heat by the refrigeration cycle can be obtained.

In each of the steps S1 to S25, even if the load conditions are different, the predetermined time (for example, the continuous operation time is set to the lower limit operation time M1 = 38 minutes and the upper limit operation time M2 = 40 minutes) Eventually, the temperature converges in a short time, and the temperature in the refrigerator can reach the set temperature (for example, T = −20 ° C. to −16 ° C.) with a minimum number of rotations of the compressor. It is possible to obtain a refrigerator with high cooling efficiency that takes into consideration the intrusion of the heat of condensation by the refrigeration cycle regardless of the load condition regardless of the load condition.

When the operation mode is switched to mode A (for example, mode A = answering machine mode) by the mode switching device 8, the operation mode is set to mode A in step S1 and the process proceeds to step S26. After the operation mode has been switched to mode A by the mode switching device 8 in step S26, it is determined in the control means 2 whether the freezer door 24 or the refrigerator door 25 has been opened, and if the door has not been opened / closed, the flow proceeds to step S27. move on.

Thereafter, in step S27, the operation set temperature of the mode A is set to T1 = T4 (for example, T4 = −14).
° C), and the basic compressor speed is N1 = N1 (for example, N1 =
2400 rpm), the lower limit operation time is M1 = M4 (for example, M4 = 48 minutes), and the stop set temperature is T2 = T3 (for example, T4).
3 = −18 ° C.), and the upper limit operation time is M2 = M5 (for example, M
5 = 50 minutes), the compressor upper limit rotational speed is NM = NM (for example, NM = 3000 rpm), and the additional operation time is M3 = M3.
(For example, M3 = 10 minutes), and step S
Proceed to 3. Subsequent movements are the same as the above-described steps S4 to S25, except that the respective values of the judgment criteria are different.

In the above operation, the stop time of the compressor was 14
And the operating time of the compressor is M5 = 5 of the upper limit operating time.
Assuming 0 minutes, the operating rate of the compressor is 50 ° (50 °).
+14) × 100, which is approximately 78%. This value narrows the range of ability to cope with an increase in load due to the opening and closing of the door of the refrigerator, but the operating efficiency of the compressor 4 is improved without using the compression function more than necessary, and the intrusion of condensation heat due to the refrigeration cycle is prevented. Is considered, the cooling efficiency is considerably high. In a refrigerator having a refrigerant gas type refrigeration cycle using a current compressor, the operating rate of the compressor is 70%.
It is desirable to set the value to about 80% in view of practical use.

Further, the above-mentioned operation set temperature T1 and stop set temperature T2 are set to temperatures (T1
= T4 = -14 ° C, T2 = T3 = -18 ° C), so less power is required for cooling, the temperature difference from outside air is reduced, and the amount of heat absorbed from outside air is reduced. As a result, the heat loss due to the decrease in the temperature is reduced, and a more efficient and labor-saving refrigerator is obtained.

During operation in mode A, the freezer compartment door 24
Alternatively, if the refrigerator compartment door 25 is opened, step S26
It is determined that the door has been opened and closed, and the process proceeds to step S2 to return to the normal operation mode in preparation for an increase in load.
Therefore, even if the temperature inside the refrigerator rises due to the door opening / closing operation, the operation returns to the normal operation, and the storage in the refrigerator is always kept at a temperature suitable for storage. At this time, in step 2, the storage of the information that the door opening / closing operation has been performed so far is temporarily deleted from the control unit 2.

Incidentally, with the operation of the compressor 4,
The in-compartment blower 6 is operated by the driving means 7, and is controlled by the control means 2 so that the in-compartment blower 6 is operated at an appropriate set rotational speed corresponding to the rotational speed of the compressor 4.

Further, the freezing room 1 using the in-compartment temperature detecting device 3
3, the set stop temperature T2 and the set operation temperature T
The comparison between 1 and the detected temperature and the determination of the execution of the driving means 5 for operating / stopping the compressor 4 based on the comparison are related to the counting operation including the counting of the counters Ma and Mb.
Executed at regular intervals.

When it is desired to rapidly freeze the stored material in the refrigerator, an operation mode different from the mode A is set separately, and the rotation speed of the compressor 4 is changed to a high rotation speed (for example, N1 = NR).
= NM = 4000 rpm), and with the increase / decrease of the rotation speed of the compressor 4, the rotation speed of the fan 6a of the in-compartment blower 6 is increased / decreased so as to be optimal, or the above-mentioned partitioning cold air duct 12a or In the same manner as described above, the number of revolutions of a circulating blower that assists circulation of cold air in the refrigerator, which is provided separately near the cold air intake port and the discharge port of the partitioning cold air duct 12a including the modular duct 12b and the modular duct 12b, and cooling the compressor, etc. Obviously, if a blower provided for this purpose is separately provided in the machine room 15 and the rotation speed of the blower is increased or decreased in the same manner as described above, the cooling efficiency will be further improved.

Further, the above-mentioned respective rotational speeds are found in advance by experiments or the like so as not to be the resonance rotational speeds of pipes, sheet metals, etc. in the refrigerator main body 11, and the rotational speeds can be set except for the rotational speeds. Then, the generation and breakage of noise due to resonance can be prevented, and the number of rotations of the compressor and the blower is set so that the number of rotations does not produce a beat sound at each rotation speed. Can be prevented.

The compressor upper limit rotational speed NM and the respective blower rotational speeds associated therewith are set to predetermined values in accordance with changes in the external air temperature around the refrigerator body 11, so that when the external air temperature is low, It is possible to minimize the clogging of the cooler 18 and to cope with the cooling speed by reducing the rotation speed of the cooling device 18 and increasing the rotation speed when the outside air temperature is high.

[0054]

According to the first aspect of the present invention, since the refrigerator of the present invention is configured as described above, the operation time from the start to the stop of the compressor can be stably maintained within the set predetermined time. Because of the control, the value of the operation rate of the compressor can always be set to an ideal predetermined value, and a refrigerator having a high cooling efficiency can be obtained in consideration of the intrusion of condensation heat by the refrigeration cycle regardless of the load condition.

According to the second aspect of the present invention, even if the load increases, the internal temperature of the refrigerator can reach the set temperature in a time as short as possible to a predetermined time with the rotational speed of the compressor as small as possible. In addition, efficient operation rate control that does not change even under different load conditions of the refrigerator can be achieved, and a refrigerator with high cooling efficiency that takes into consideration the intrusion of condensation heat by the refrigeration cycle regardless of the load condition can be obtained.

According to the third aspect of the present invention, it is possible to start from the beginning of the next operation at the number of revolutions of the compressor when the temperature reaches the stop set temperature over a predetermined time or more.
The operation is started in consideration of the efficient operation rate control of the compressor without waste, and a refrigerator capable of operating with high cooling efficiency in consideration of the intrusion of heat of condensation by the refrigeration cycle is obtained.

Further, according to the invention of claim 4, it is possible to start from the beginning of the next operation at a rotation speed lower than the rotation speed of the compressor when the stop set temperature is reached in less than the set predetermined time, Without using compression force more than necessary,
It is possible to operate the compressor for a predetermined period of time, and to obtain a refrigerator with improved cooling efficiency in consideration of the intrusion of heat of condensation by the refrigeration cycle.

Further, according to the fifth aspect of the present invention, when the predetermined time can be switched to a long time within a range of good cooling efficiency in consideration of the penetration of the heat of condensation by the refrigeration cycle, the load becomes large. Although the range of response capacity becomes narrower, the operation efficiency of the compressor is improved without using the compression function more than necessary, and a refrigerator with better cooling efficiency considering the intrusion of condensation heat due to the refrigeration cycle is considered. can get.

Furthermore, according to the present invention, when the operating temperature or the set stop temperature can be switched to a high temperature that does not hinder freezing and storage, the power consumption for cooling is small. In addition, since the temperature difference from the outside air is reduced, the amount of heat absorbed from the outside air is reduced, so that heat loss can be reduced, and a more efficient and labor-saving refrigerator can be obtained.

According to the seventh aspect of the present invention, even if the temperature inside the refrigerator rises due to the opening and closing operation of the door, the operation returns to the normal operation, so that the storage in the refrigerator is always kept at a temperature suitable for storage. Will be able to

[Brief description of the drawings]

FIG. 1 is a block diagram of a control device showing an embodiment of a refrigerator of the present invention.

FIG. 2 is a side sectional view showing an embodiment of the refrigerator of the present invention.

FIG. 3 is a flowchart of a control device showing the embodiment of the refrigerator of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control device 2 Control means 3 Internal temperature detection device 4 Compressor 8 Mode switching device

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takahiro Fujimitsu 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka Inside (72) Inventor Hiroshi Yoshimura 22-22, Nagaikecho, Abeno-ku, Osaka-shi, Osaka F term in reference (reference) 3L045 AA02 BA01 CA02 DA02 EA01 GA07 HA01 LA05 LA06 LA10 MA02 NA15 NA16 PA03 PA04

Claims (7)

[Claims] 1. An internal combustion engine comprising: a rotational speed control means for controlling a rotational speed of a compressor within a predetermined range; and an internal temperature detecting means for detecting an internal temperature at predetermined time intervals. By controlling the operation and stop of the compressor based on the detected internal temperature, in the refrigerator in which the internal temperature is maintained at a predetermined set temperature, the time from the start to the stop of the compressor is predetermined. A control means for controlling the number of revolutions of the compressor so that the time is equal to. 2. The apparatus according to claim 1, further comprising: rotation speed control means for controlling the rotation speed of the compressor within a predetermined range; and temperature detection means for detecting the temperature in the storage at predetermined time intervals. By controlling the operation and stop of the compressor based on the detected internal temperature, in the refrigerator in which the internal temperature is maintained at a predetermined set temperature, the compressor is operated at a predetermined rotation speed for a predetermined time. Only continuously, and when the value detected by the internal temperature detection means has not reached the stop set temperature for stopping the compressor, the rotation speed of the compressor is a predetermined number until the stop set temperature is reached. A refrigerator characterized by comprising control means for increasing the number of rotations of the compressor stepwise from a predetermined number of rotations by a predetermined number of rotations for each additional operation time having an interval. 3. The compressor is operated, and after the internal temperature reaches the stop set temperature within a predetermined range of time relative to the predetermined time or a time exceeding the predetermined time, the compressor is stopped. A control means for operating the compressor at the rotation speed of the compressor immediately before stopping the compressor when the internal temperature is equal to or higher than the operation set temperature of the temperature at which the compressor is operated. The refrigerator according to claim 1 or 2, wherein 4. The compressor is operated to stop the compressor after the internal temperature reaches the stop set temperature in a time shorter than a predetermined range with respect to the predetermined time. A control means for operating the compressor at a reduced rotation speed lower by a predetermined rotation speed than a rotation speed of the compressor immediately before stopping the compressor when the temperature becomes equal to or higher than an operation set temperature. 4. The refrigerator according to claim 1, 2 or 3. 5. The switching device according to claim 1, wherein the predetermined time is switched to a different time by a switching unit.
The refrigerator according to claim 1. 6. The refrigerator according to claim 1, wherein the set stop temperature and the set operation temperature are switched to different temperatures by switching means. 7. The value of the predetermined time or the set temperature switched by the switching means returns to the value of the normal operation by performing a door opening / closing operation. Refrigerator.