JPS6030977A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a refrigerator that cools a freezer compartment with both a fan-cool cooler and a direct-cool cooler.

[Technical backbone of the invention]

In this type of refrigerator, the air inside the freezer compartment is circulated.
The L fan device is driven and stopped in synchronization with the supply and cutoff of refrigerant to the fan cooling cooler. In addition, defrosting of the freezer compartment can be carried out by heating the cooling 2J1 cooler with a defrosting heater, for example, with the refrigerant supply to the fan cooling cooler N1 cut off.
i now.

[Problems with background technology]

However, in the above configuration, after defrosting the fan cooling cooler, when refrigerant is resupplied to the auxiliary cooler and the fan cooling cooler, the fan cooling cooler is installed due to residual heat from defrosting. The humidity in the circulation path is higher than that inside the refrigerator, and the temperature on the surface of the auxiliary cooler reaches a lower temperature earlier than the surface temperature in the circulation path. Conventionally, in this type of fan-cooled refrigerator, a fan-cooled refrigerator is used to cut off the freezer compartment and circulation compartment during defrosting.
■l A damper is not provided, and as a result, convection occurs due to the temperature difference between the freezing chamber where the auxiliary cooler is installed and the circulation path, and the relatively humid air in the circulation path during defrosting is used. l
It flows inward and is therefore cold! As the temperature inside the seedling rises, the moisture contained in this air is cooled by the auxiliary cooler in the freezing room, solidifying and forming frost. Therefore, even though the defrosting operation of the freezer compartment has been completed, there has been a problem in that frost builds up on the auxiliary cooler in the freezer compartment.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a refrigerator that can prevent adverse thermal effects from occurring in the freezer compartment after defrosting the freezer compartment.

[vX essentials of invention]

The present invention has a damper device that is shut down during defrosting operation, and a first damper device in a circulation path that circulates air in the freezing room using a fan device.
A cooling IJl device is provided, and a second cooler is arranged in the freezing chamber, and the fan device is stopped for a predetermined time after the defrosting operation of the first cooler is finished, and the damper device is A timer device is provided to forcibly operate the compressor with the refrigeration unit closed to supply refrigerant to both the first and second coolers, thereby creating air convection within the refrigeration unit. The first cooling unit cools both coolers without cooling, absorbs the residual heat during defrosting, and the second cooling unit cools the inside of the freezer compartment. A timer device is provided for supplying refrigerant to both the first and second cooling units by operating the compressor strongly for a certain period of time with the fan device being driven and the damper device being closed. The main feature is that the cold gas generated by the first cooler is circulated into the freezer compartment, and the second cooler directly cools the stored items in the freezer compartment.

[Example of Zago Akira]

An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, which shows the vA essentials of a refrigerator, a heat insulating box 1 has a refrigerator compartment 2 and a freezer compartment 3 that is thermally independent from the refrigerator compartment 2. The doors 2a and 3'a'i90 are installed so that they can be opened freely.A cooler 4 for the refrigerator compartment is placed inside the cold room 2, and food is placed in the freezer compartment 3 to be directly cooled. f, l] An auxiliary cooler 5, which is a second cooler, is installed to cover the freezer compartment 3. Also, a part of the circulation path that circulates the air in the freezer compartment 3 is installed at the back of the freezer compartment 3 and under the floor. It forms the air passage chamber 6. 7 is inside the freezing chamber ζ3 which is the first cooler) Jl
This is arranged in the air passage chamber 6 and is connected to the auxiliary cooler 5.
The inside of the freezer compartment 3 is cooled in cooperation with the refrigerator. Reference numeral 8 denotes a device installed above the main cooler I for the freezer compartment in the air passage chamber 6 to open and close the air passage chamber 6, and 9 denotes a fan motor 9a.
This is a fan device that is disposed above the damper device 8 and circulates the air in the freezing chamber 3 through the air passage chamber 6. The refrigeration cycle of this refrigerator is constructed as shown in FIG. That is, a condenser 11 and a first control valve 1 are connected between the discharge port and the suction port of the rotary compressor 10.
2. It forms a refrigerant flow path consisting of a refrigerator compartment cooler 4, a freezer compartment main cooler 7, an accumulator combulator 13, and a check valve 14, and a first control valve 12 and a refrigerator compartment cooler I unit 4. A flow path consisting of a second control valve 15 and an auxiliary cooler 5 is connected in parallel with the flow path consisting of the second control valve 15 and the auxiliary cooler 5. Note that 16a to 16e are capillary tubes. FIG. 3 shows the circuit configuration for controlling this refrigeration cycle. In this FIG. 3, 17 is a control section which receives temperature information from a temperature detection unit 18 and gives a control signal to a drive unit 19. Second
The control valve 15 of 1 to transistors 20a and 20b is used to control opening and closing of the defrosting heater 21, damper drive heater 22, and A compressor motor 23 that drives the compressor 10 is controlled to be turned on and off through relay contacts 24 to 27, respectively. Here, the tamper drive heater 22
is for operating the damper device 8, which opens and closes the discharge port of the communication passage 6 into the freezer compartment ζ3, in the opening direction by heating the heat-sensitive portion 28a including the bellows portion 28 thereof. Although not specified, this Luri control section 17 is used to control a timer for a water droplet removal operation that controls a "defrosting completion A" band operation J, which will be described later, as well as a first and second timer for a forced recovery operation of the internal temperature. It is equipped with a timer device, and the first timer device starts timing operation when the water droplet removal operation is completed.
The second timer device drives the combiner 10 and keeps the fan device 9 stopped and the damper device 8 closed for a predetermined period of time, for example, 10 minutes.
If the compressor 10 continues to be driven for a predetermined period of time, for example, 20 minutes after the timer device finishes timing, the system will cause the fan device 9 to be driven and the damper device 8 to be opened.
has been completed. In addition, in other parts of this Figure 3,
29 is an operation and display unit 1 to 29 consisting of a 4M open operating section for controlling the temperature of the refrigerated air, a rapid freezing switch, etc., and a display section for displaying operation display, temperature status display, etc. 30
31 is a door switch, and 32 is a plug terminal.

FIG. 4 shows a specific circuit of the temperature detection unit 1B.
It is something. In this Fig. 4, 33 is a cold f for the refrigerator compartment.
, 11 is a room temperature detection element, 34 is a refrigerator room temperature detection element, 35 is a defrosting completion detection element (temperature detection), and 36 is a refrigerator room temperature detection element. Among these, the front three right elements 33, 34, 35
The signal due to the resistance change of the comparators 37, 38.
39, the voltage is compared with the reference values Va, Vl+, and Vc set by the voltage dividing resistor circuits 33a, 34a, and 35a, and the refrigerator to cooler temperature signal Sl, the refrigerator room air temperature signal S2,
It is given to the control unit 17 as a defrosting completion signal S4, and the resistance change of the freezing room temperature detection element 36 is compared with the reference value Vd set by the voltage dividing resistor circuit 36a by the comparator 40, and lit control is performed as the freezing room temperature No. 13 S3. 17. In particular, the comparator 40 has a hysteresis loop 40a including a diode, so that the temperature value of the frozen room temperature (air temperature) signal S3 becomes slightly different in the upward shift process and the downward process of the internal egg temperature, thereby increasing the stop temperature of the compressor 10. A predetermined humidity difference is maintained between the temperature and the restart temperature.

Next, the operation of the above structure (also shown in the flowcharts of FIGS. 5 and 6) will be explained. This explanation should make the structure of the refrigeration cycle control system more clear.

(I> Normal operation If the temperature of refrigerator compartment 2 and freezer compartment 3 is higher than the set temperature, Jo
Then, the control section 17 determines this based on the refrigerator room cold N1 temperature signal Ss, the refrigerator room air conditioning signal S2, and the cold 11 temperature signal S3, which are constantly received from the temperature detection unit 18, and sends a signal to the compressor motor 23. The recombpressor 10 is driven and the first control valve 12 is energized, and the first control valve 12 is
Upon hearing this, the second control valve 15 is closed to continue cooling operation. That is, in this state, the refrigerant gas discharged from the compressor 10 is liquefied by the condenser 11 and passes through the first control valve 12 to the refrigerator compartment cooler 4.
It is then supplied to the main cooler 7 for cooling the refrigerator compartment 2 and the freezer compartment 3. In this case, the inside of the refrigerator compartment 2 is cooled by natural convection, and the inside of the freezer compartment 3 is cooled by forced circulation of cold air from the refrigerator compartment cooler 7 through the fan device 9 (during this time, the damper device 8 is not operated). ). When the temperature of the refrigerator compartment 2 drops to the set temperature, the refrigerator room temperature detection element 34 detects 1!
The first control valve 12 is closed and the second control valve 15 is closed based on the γ air depletion signal S2, and the switching operation is performed to transfer the refrigerant to the auxiliary cooling unit 5 and the refrigeration main cooling unit 77J. Switch to the supply state to the device 7. In this state, when the temperature of the freezer compartment 3 drops to the set temperature, the compressor 10
Stop driving. During such a stop period of the compressor 1o, the first control valve 12. Both of the second control valves 15 are kept open, thereby preventing the superheated refrigerant gas remaining in the condenser 11 from leaking to the cooler side and heating it immediately after the compressor 1o is stopped. At the same time, the efficiency of restarting the compressor 10 is improved by maintaining the refrigerant in the condenser 11 at a high condensing pressure state. If the temperature of the freezing chamber 3 rises above the set range while the compressor 10 is stopped, the compressor 10 is restarted based on the freezing room temperature signal S3 at this time.

(I [) Prevention of reduction in refrigerator compartment cooling capacity The first FTDJ control valve 12 opens while the compressor 10 is operating, and the refrigerant is transferred to the refrigerator compartment cooler 4 and the main cooler 7 for freezing.
If the condition in which the supply is supplied to both of the first and second
While closing the second control valve 12, the second control valve 15 is opened to stop the refrigerant supply to the refrigerator compartment cooler 4. As a result, the refrigerant is continuously supplied to the refrigerator compartment cooler 4 for a long period of time, so that the frost does not lose the opportunity to dissolve naturally, so that a large amount of frost adheres to the refrigerator compartment cooler 4. This prevents a situation where the cooling efficiency inside the refrigerator decreases.

(II) Prevention of cooling stoppage in the refrigerator If 30 minutes have passed since the temperature in the refrigerator compartment 2 rose to the cooling start temperature, for example, 3.5° C. while the compressor 10 is stopped, the compressor 10 and the compressor motor 23
is forcibly driven without depending on the frozen room temperature signal S3 from the frozen room temperature detection element 36. Such forced restart of the compressor 10 is performed by a timer that monitors the temperature signal S1 of the refrigerated air-cooled 7J by the refrigerated room cooling type temperature detection element 33. As a result, it is possible to prevent the refrigerator compartment 2 from being left in an out-of-operation state for a long time with a high internal temperature due to a large load placed inside the refrigerator compartment 2.

<rv> Rapid refrigeration operation This is done manually by starting the rapid refrigeration timer and driving the compressor 10, while closing the first control valve 12 and closing the second control valve 15, thereby turning on the auxiliary cooler 5. This is an operation in which the refrigerant supply to the main cooler 7 for the freezer compartment is forcibly continued for the set time, thereby rapidly cooling the inside of the freezer compartment 3.

Then, when the set time of the quick freezing timer elapses, the first control valve 12 opens and the second control valve 15 closes to forcibly perform a channel switching operation for the refrigerator compartment cooler 4 and the freezer compartment cooler 4 and the freezer compartment cooler 4. The refrigerant is supplied to the main cooler 7, and this is continued until a refrigerant JJ stop command is given based on the refrigerating room air temperature signal S2 from the refrigerating air temperature detecting element 34. In this way, during the rapid freezing operation period of the freezer compartment 3, the refrigeration +2
The temperature within the range 4 is compensated for.

(V) Defrosting operation The defrosting operation of the main cooler 7 for the freezer compartment is performed as follows. That is, the defrost monitoring timer integrates the operating time of the compressor 110, and outputs a defrost start command signal when the operating time reaches a set time, for example, 48 hours. This command causes defrosting completion supplementary operations to be performed.

(A) Pre-defrosting forced cooling Mj operation Based on the defrosting start command, the compressor motor 23 and the fan device 9 are driven, and the first control valve 12 is forced to perform the Itil release operation to cool the refrigerator compartment cooler 4. and supplies refrigerant to the main cooler 7 for the freezer compartment.

This state continues until the first control valve 12 is closed in response to the refrigerator compartment air temperature signal S2 from the freezing room temperature detection element 34, whereby the refrigerator compartment 2 is forcedly cooled. And refrigerate! When the first control valve 12 is closed and the second control valve 15 is opened in response to the air temperature signal S2, the refrigerant is forcibly supplied to the auxiliary cooler 5 and the refrigerator compartment cooler 7. It lasts for a certain period of time, for example 15 minutes, by a dedicated timer. Then, after this time has elapsed, the drive of the compressor 10 is stopped and the first control valve 12. While the second control valve 15 is brought into the closed state, the damper device 8 is shifted to the (1) production operation. The damper device 8 is opened vertically by energizing the damper drive heater 22 to expand the bellows portion 28. In this way, the water vapor that fills in the air passage palm 6 during defrosting operation is discharged into the freezing compartment 3 due to the flow effect due to the temperature difference with the freezing compartment 3, and reaches the surface of the auxiliary cooler 5. When the damper device 8 is closed, the defrosting heater 21 is energized, and the actual defrosting is performed to melt and remove the frost that has adhered to the main cooler 7 for the freezer compartment. The operation is started. When defrosting is completed, the surface temperature of the main cooler 7 for the freezer compartment rises suddenly, and the control unit 17 detects this as the defrosting completion signal obtained by the defrosting completion detection element 35. Based on the judgment in S4, the defrosting heater 21 is cut off and the defrosting completion operation is performed.

(B) Operations incidental to completion of defrosting The operations following completion of defrosting include an operation for removing water droplets and an operation for forcibly recovering the internal temperature.

First, after the defrosting heater 21 is powered off, the damper device 8 is activated for a predetermined short period of time, for example, 5 minutes, by a water droplet removal operation timer.
is then maintained in the open state and the compressor 10 is maintained in the stopped state. During this period, water droplets that have adhered to the surface of the main cooler 7 for the freezer compartment due to melting of frost are allowed to flow down naturally, thereby preventing these water droplets from freezing at the start of the cooling operation.

Now, after the water droplet removal operation is completed by the water droplet removal timer, the internal temperature forced recovery operation is performed as follows. That is, as the set time of the timer elapses, the first timer device for forced recovery of the temperature inside the refrigerator starts timing operation, which forcibly drives the compressor 10 and turns the second control valve 15 into UIJ. A defrosting residual heat absorption signal for supplying refrigerant only to the auxiliary cooler 5 and the main cooler J unit 7 for the freezer compartment is carried out on an iA basis for a predetermined period of time, for example, 10 minutes. Meanwhile, following the water drop removal operation, the damper device 8 is kept in the a1 state by the first timer device during this time as well, and the fan device 9 is also kept in the stopped state. With this, freezer compartment 3
Since the main cooler 7 for the freezer compartment and the auxiliary cooler 5 are cooled while the air circulation inside the freezer compartment is stopped, the auxiliary cooler 5 cools the interior of the freezer compartment 3, and at the same time, the main cooler 7
The remaining heat during defrosting is absorbed, and the cooler 7 itself and, by extension, the inside of the air passage 6 are cooled down to sufficiently low humidity again. In this way, if the cooling operation is started at the same time as the defrosting is completed,
! 7 when the damper device 8 is heard and the fan device 9 is driven.
This prevents the inconvenience that water vapor or residual heat, i.e., warm air trapped in the soil cooling fiJ device γ for the freezer compartment and the air passage chamber 6 due to the defrosting operation is immediately blown out into the freezer compartment 3.

Next, when this defrosting residual heat absorption operation is completed, the second timer device starts operating at 81:00, and this time, the damper device 8 is opened and the fan device 9 is driven while the refrigerant is transferred to the auxiliary cooler. 5 and the main cooler 7 for the freezer compartment for about 20 minutes. In this case, the inside of the freezer compartment 3 is strongly cooled by the circulation of cold air generated in the auxiliary cooling FJI device 5 and the main cooling N1 device 7 for freezing. The temperature in the freezer compartment 3 quickly drops to the set temperature ( The control operation is shifted to normal operation based on the freezer compartment cooler signal S3 from the freezer room temperature detection element 36.

(Vl) Priority relationship between rapid freezing and defrosting operations In actual use, a rapid freezing command is issued during the defrosting cycle (meaning that includes related operations before and after the actual frost melting operation), or The opposite may occur, and the priority relationship in that case is described below.

If the command for the rapid freezing operation is received during the defrosting forced cooling operation after a defrosting command has already been generated, or after the defrosting residual heat absorption operation is completed during the defrosting completion incidental operation, the control 11 section 171 is activated. The freezing operation is given priority, the subsequent operation of the defrosting cycle is stopped, and the defrosting command is set again.

On the other hand, if the command for C-fast freezing operation is received between the end of the defrost residual heat absorption operation of the defrost cycle and the end of the defrost residual heat absorption operation, the defrost operation is given priority. Let it continue as is.

In the above embodiment, in order to detect the refrigerator room temperature, the air temperature and the temperature of the cooler itself are detected, and these detection signals are selected and used depending on the control purpose. It is also possible to handle only the refrigeration room temperature signal as the refrigerating room temperature signal. In addition, the timer device for forced recovery of the internal temperature after defrosting the soil cooler 7 for the freezer compartment is composed of the first and second timer devices as in the above embodiment.
It is configured by installing a single timer so that a defrosting residual heat absorption signal is output when a predetermined time has elapsed from the start of timing operation, and a forced cooling signal is output after a predetermined time has elapsed. The compressor 10 is forcibly operated for a predetermined time with the device 9 stopped and the damper device 8 closed, and then the fan device 9 is driven and the damper 10 is operated for a predetermined time with the compressor 7L/tuber 10 kept in operation according to the forced cooling signal. The device 8 may be opened.

〔Effect of the invention〕

As described above, the present invention provides the first and second cooling devices with the fan device stopped and the damper device closed for a predetermined period of time after degreasing the first cooling device installed in the circulation path for circulating air in the freezer compartment. Since a timer device is installed to supply refrigerant to the cooler, it is possible to absorb residual defrosting heat from the first cooler and prevent it from entering the freezer compartment. It is possible to prevent frost formation, and furthermore, a timer device is installed that drives the fan device for a predetermined period of time and then opens the damper to supply refrigerant to both coolers. It has excellent practical effects in that it can cool Ml to a high degree, quickly recover the temperature in the freezing room after defrosting, and further improve the storage stability of stored items.

[Brief explanation of drawings]

The drawings relate to one embodiment of the present invention, and FIG. 1 is a schematic vertical side view of a refrigerator, FIG. 2 is a connection diagram of a refrigeration cycle, FIG. 3 is an explanatory diagram of the configuration of a control circuit, and FIG. 4 is a schematic longitudinal side view of a refrigerator. is a wiring diagram of the temperature detection unit, and FIGS. 5 and 6 are flowcharts. In the figure, 2 is a refrigerator compartment, 3 is a freezer compartment, 4 is a cooler for the refrigerator compartment,
5 is an auxiliary cooling PL device (second cooler), 6 is an air passage chamber (circulation path), 7 is a main cooler for the freezer compartment (first cooler), 8 is a damper device, 9 is a fan 7. 10 is a compressor. Applicant: Tokyo Shibaura Electric Co., Ltd. (Company Figure 1 Figure 2 Figure 3 Figure 4 Figure 4 + V Unit 5

Claims (1)

[Claims] 1. A first cooler is provided in the circulation path that has a damper device that opens during defrosting operation and circulates the air in the cold a'Ei by a fan device, and a second cold N1 cooler is installed in the freezer compartment. In this case, after the first cooler is unboxed, the fan device is stopped for a predetermined period of time, and the compressor is forcibly operated with the damper device closed, and the first and second coolers are A timer device for supplying refrigerant to the FJI device, and a timer device for driving the fan device for a predetermined period of time and forcibly operating the compressor with the damper device chained to the first and second devices. This refrigerator is characterized by being equipped with a timer device that supplies refrigerant to the cooler.