JP2003004355A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator of which the storage chamber can be kept at a more appropriate temperature even with a compressor operated continuously at a low frequency under an inverter control, in an external air temperature zone necessitating power supply to a refrigerator temperature compensation heater, in regard to the storage chamber having this heater. SOLUTION: A half-wave rectification power supply circuit is provided in a control device constituted of a microcomputer or the like. When an external air temperature T detected by an external air temperature detecting sensor lowers to a first determination reference value T1 at which energization of a vegetable chamber heater becomes necessary, a half-wave rectified power HH is supplied to the vegetable chamber heater and continuous power supply is conducted even when the compressor is operated at the low frequency SL. When the external air temperature T lowers further and comes to a second determination reference value T2, the power supply to the vegetable chamber heater is controlled to be with a normal power HT. When the external air temperature T begins to rise and comes to the second determination reference value T2, the half-wave rectified power HH is supplied to energize the vegetable chamber heater, and when the temperature rises further and comes to the first determination reference value T1 or above, the power supply to the heater is controlled to stop.

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 control device and a control method for keeping a storage room having a temperature compensating heater in a refrigerator at an appropriate temperature.

[0002]

2. Description of the Related Art In a refrigerator, for example, as shown in FIG. 1, a refrigerator main body (also referred to as a heat insulating box body) in which a foam insulating material 4 is filled between an outer box 2 made of a steel plate and an inner box 3 made of a synthetic resin. A plurality of heat insulating partition bodies 5, 6 etc. are provided inside 1 and a refrigerating chamber 7,
The vegetable compartment 8 is formed in the center and the freezing compartment 9 is formed in the lower part, and the cold air producing chamber 10 provided behind the vegetable compartment 8 is provided with the first cooler 11 for producing cold air to the refrigerating compartment 7 and the vegetable compartment 8 and the cool air. A blower 12 for forced circulation is provided, and a second cooler 13 for generating cold air to the freezing chamber 9 and a blower 14 for forced cold air circulation are provided in another cold air generating chamber provided behind the freezing chamber 9. The compressor 16 and the condenser 17 are provided in the machine room 18 at the rear of the lower part of the refrigerator body 1.

By the way, the temperature of the refrigerator compartment 7 is around 3 ° C., the temperature of the vegetable compartment 8 is around 7 ° C., and the temperature of the freezer compartment 9 is-.
The temperature difference between the upper and lower sides of the heat insulating partition 6 is 2 because it is below 20 ° C
The temperature rises above 0 ° C and depends on the thickness of the heat insulating partition 6,
Due to the heat transfer between the upper and lower sides, the vicinity of the upper surface of the heat insulating partition 6 may be in a negative temperature zone, and there is a risk that the food stored in the vegetable compartment 8 will freeze.

Therefore, in the conventional refrigerator, the vegetable compartment heater (sheath heater) 15 is embedded in the upper portion of the heat insulating partition body 6, while the temperature outside the refrigerator body 1 is detected at a predetermined position on the front surface of the refrigerator body 1. The outside air temperature detection sensor 19 is provided, and the determination value of the outside air temperature T detected by the outside air temperature detection sensor is a preset first determination reference value T1 and an outside air temperature lower than the first determination reference value T1. If the detected outside air temperature T is lower than the preset first determination reference value T1, the energization of the vegetable compartment heater 15 is performed as shown in FIG. By performing the above, it is possible to prevent the vegetable compartment 8 from overcooling, and to control the vegetable compartment heater 15 to be de-energized if the outside air temperature T is equal to or higher than the first determination reference value T1. .

Since the vegetable compartment heater 15 is set to have a heater capacity required when the outside air temperature T is low, the outside air temperature T becomes low, and the first judgment that the vegetable compartment heater 15 needs to be energized. Between the second determination reference value T2 (t1 to t3) further decreased from the reference value T1, and from the second determination reference value T2 when the outside air temperature T starts to increase, the first determination to stop energization becomes higher. When the capacity of the vegetable compartment heater 15 becomes excessive between the reference values T1 (t5 to t6), the vegetable compartment heater 15 is energized only when the compressor 16 is stopped,
The method of controlling capacity was taken.

However, the above control method is based on the assumption that the inside of the vegetable compartment 8 does not get too cold when the outside air temperature T is high, and there is a problem that it may freeze depending on the food stored. . If the compressor 16 is inverter-controlled and is continuously operated at a low operating frequency, the capacity of the vegetable compartment heater 15 cannot be controlled by energizing the vegetable compartment heater 15 only when the compressor 16 is stopped. Improvement was requested.

SUMMARY OF THE INVENTION In view of the above problems, in the present invention, in a storage room having an internal temperature compensating heater, a compressor is used in an outside air temperature zone where the internal temperature compensating heater needs to be energized. It is an object of the present invention to provide a refrigerator in which the storage room can be maintained at a more suitable temperature and an energy saving effect can be obtained even when the inverter is controlled by an inverter and continuously operated at a low frequency.

[0007]

In order to solve the above problems, the present invention divides the heat-insulating box body into a plurality of storage chambers and a freezing chamber by a partition wall and warms the storage chamber by compensating for the temperature inside the storage chamber. A heater, an outside air temperature detection sensor for detecting the outside air temperature, and a control device for controlling the inside temperature compensating heater are provided, and a machine room is provided in the lower rear part of the heat insulating box, and a compressor is arranged in the machine room. In the refrigerator, a half-wave rectification supply circuit is newly provided in the power supply circuit to the interior temperature compensation heater of the control device, and a first determination reference value of the outside air temperature set in advance and the first determination When the second judgment reference value of the outside air temperature lower than the reference value is set, and the outside air temperature detected by the outside air temperature detection sensor becomes lower than the first judgment reference value, a half wave is applied to the inside temperature compensation heater. Supply rectified power to continuously energize the outside air Degree is in the second case of falls below the determination reference value, the configuration and a control unit for controlling to the energization of the in-compartment temperature compensation heater to the normal power supply.

When the operating frequency of the compressor changes from high frequency operation to high frequency operation, the supply of half-wave rectified power to the internal temperature compensating heater is controlled to the normal power supply.

An operating portion is provided on the door surface of the refrigerating compartment, and the outside air temperature detecting sensor is arranged in the operating portion.

The inside of the heat-insulating box is partitioned by a partition wall into a plurality of storage chambers and a freezing chamber, and a chamber temperature compensating heater for warming the storage chamber, a chamber temperature detection sensor for detecting the temperature of the storage chamber, and In a refrigerator provided with a control device for controlling the temperature compensating heater in the refrigerator, a machine room is provided in the lower rear part of the heat insulating box, and a compressor is disposed in the machine chamber, in the refrigerator, A new half-wave rectification supply circuit is provided in the power supply circuit, and the first determination reference value of the preset internal temperature and the second determination reference of the internal temperature lower than the first determination reference value are set. When a value is set and the inside temperature detected by the inside temperature detection sensor is lower than the first determination reference value, half-wave rectified power is supplied to the inside temperature compensation heater to perform continuous energization, If the temperature inside the refrigerator falls below the second criterion value, The energization of the inside temperature compensation heater has a configuration including a control device for controlling to the normal power supply.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below as examples based on the accompanying drawings. FIG. 1 is a side sectional view showing a form of a refrigerator according to a first embodiment of the present invention, FIG. 2 is a control block diagram of the first embodiment according to the present invention, and FIG. 3 is a first embodiment according to the present invention. FIGS. 4A and 4B are diagrams showing a control operation example based on the embodiment, FIG. 4 is a side sectional view showing a form of a refrigerator according to a second embodiment of the present invention, and FIG. It is a control block diagram of a 2nd example, and Drawing 6 is a figure showing an example of control operation based on a 2nd example. In addition, the same parts as those in the related art are denoted by the same reference numerals.

FIG. 1 is a side view showing the inside of a refrigerator according to a first embodiment of the present invention. In the figure, 1 is an outer box 2 made of steel plate, an inner box 3 made of synthetic resin, and foam insulation. A refrigerator main body (also referred to as a heat insulating box) made of materials 4 and the like, the inside of which is provided with upper and lower two heat insulating partition bodies 5 and 6 so that an upper refrigerating chamber 7 is provided.
And is divided into a vegetable compartment 8 in the center and a freezer compartment 9 in the lower part,
The cold room 7 is provided in the cold air generating room 10 provided behind the vegetable room 8.
Also, a cooler 11 corresponding to the vegetable compartment 8 and a blower 12 for forced circulation of cold air are provided, and another cool air producing chamber provided behind the freezing compartment 9 is provided with a second cooling device corresponding to the freezing compartment 9. A device 13 and a second blower 14 for forced circulation of cold air are provided.

A machine room 18 at the lower rear of the refrigerator body 1
While a compressor 16, a condenser 17, etc. are arranged in the above, a vegetable compartment heater (sheath heater) 15 for preventing a temperature drop in the vegetable compartment 8 is embedded in the upper part of the heat insulating partition 6, and the front of the refrigerator body 1 is Doors 24, 25, 26 for each room are arranged, and an operation part 23 is provided on the surface of the door 24 for the refrigerating room 7, and the operation part 2 is provided.
An outside air temperature detection sensor 19 for detecting the outside air temperature T
Is arranged.

FIG. 2 is a control block diagram of the first embodiment according to the present invention. In addition to the conventional energization control (full-wave rectification), the power supply circuit to the vegetable compartment heater 15 of the control device 22 including a microcomputer or the like provided in the refrigerator main body 1 (insulating box) is newly provided with a half circuit. A wave rectification supply circuit 21 is provided, and the control device 22 includes an outside air temperature detection sensor 19
The outside air temperature detected by, the operating frequency of the compressor 16 and the like are input, and based on these input signals, the vegetable compartment heater 15
And the control for supplying the half-wave rectified power source 20 to the vegetable compartment heater 15.

The refrigerator according to the first embodiment of the present invention is constructed as described above, and the control device (microcomputer) 22 thereof detects the outside air temperature detecting sensor as shown in FIG. 3 (A), for example. The determination value of the outside air temperature T to be set is set to a preset first determination reference value T1 and a second determination reference value T2 of the outside air temperature lower than the first determination reference value T1 to detect the outside air temperature. The outside air temperature T detected by the sensor 19 becomes low, and the operating frequency S of the compressor 16 becomes a low frequency SL at which the operating frequency S of the compressor 16 becomes continuous operation at the first determination reference value T1 which requires the energization of the vegetable compartment heater 15. Also, in the case where the vegetable compartment heater 15 is supplied with a half-wave rectified power source HH of 50% input and continuous energization is performed, and when the outside air temperature T further decreases and reaches the second determination reference value T2, the vegetable compartment heater 15 is supplied. Input the power supply of 100% normal power supply Controls to perform the energization by T.

Further, when the outside air temperature T reaches a second judgment reference value T2, which has begun to rise, the energization to the vegetable compartment heater 15 is half-wave rectified from an input power source HT of 100% input 50.
% Power source HH is supplied for continuous energization, and when the outside air temperature further rises and becomes equal to or higher than the first determination reference value T1, the energization to the vegetable compartment heater 15 is controlled to be stopped.

The second judgment reference value T2 (t1 to t3) further decreased from the first judgment reference value T1 which requires the energization of the vegetable compartment heater 15 and the second outside temperature T when the outside air temperature T starts to increase. A low frequency S such that the operating frequency S of the compressor 16 becomes a continuous operation between the first determination reference value T1 (t5 to t6) at which the current is further increased from the determination reference value T2 and the energization is stopped.
Even when it becomes L, the vegetable compartment heater 15 can be maintained at a more suitable temperature by supplying a half-wave rectified power source HH of 50% input and continuously energized, and only half the electric power is required. The energy saving effect can be obtained.

Since the outside air temperature T changes depending on the installation condition of the refrigerator, the outside air temperature T does not reach the second judgment reference value T2 as shown by the broken line a in FIG. 3 (A). In the case, half-wave rectified input 50 to the vegetable compartment heater 15
%, The power supply HH is continuously supplied. Also, FIG.
As indicated by a broken line b in (A), the outside air temperature T may not reach the first determination reference value T1 in some cases, and in that case, the vegetable compartment heater 15 is not energized.

Further, when the operating frequency S of the compressor 16 changes to the high frequency SH operation from the middle of the low frequency SL operation (t2 and t4), as shown in FIG. Control from the supply of the power supply HH of 50% input that has been wave rectified to the normal power supply HT of 100% input,
Prevents freezing and the like due to excessive coldness. The compressor 1
When the operating frequency S of 6 returns to the low frequency SL, normal control is performed.

FIGS. 4 to 6 show a second embodiment according to the present invention. The difference from the first embodiment will be described. The inside temperature for detecting the inside temperature K in the vegetable compartment 8 is shown. The detection sensor 27 is provided, and the determination value of the internal temperature K detected by the internal temperature detection sensor 27 is set to be smaller than the preset first determination reference value K1 and the first determination reference value K1. This is set to the second determination reference value K2 of the low inside temperature K.

As shown in FIG. 6, the inside temperature detecting sensor 2
Even when the inside temperature K detected by 7 becomes lower than the first determination reference value K1 and the operating frequency S of the compressor 16 is continuous operation at the low frequency SL, the vegetable compartment heater 15 is subjected to half-wave rectification. The power supply HH of 50% input is supplied and continuous energization is performed.
When the temperature K in the refrigerator falls below the second determination reference value K2, the vegetable compartment heater 8 is controlled so that the energization to the vegetable compartment heater 15 is set to the normal power source HT of 100% input, so that the vegetable compartment 8 becomes a more appropriate temperature. It is possible to maintain the power consumption, half the power is required, and the energy saving effect can be obtained.

With the above configuration, the compressor 16 is operated in the outside temperature range (t1 to t6) where the vegetable compartment heater 15 needs to be energized.
Even if the inverter is continuously operated at a low frequency SL by the inverter control, the second determination reference values T2, K2 (t1) that are further reduced from the first determination reference values T1, K1 that require the energization of the vegetable compartment heater 15 are required. -T3), and the outside air temperature T becomes higher than the second judgment reference values T2 and K2 at which the temperature starts to increase, and the first judgment reference values T1 and K1 (t5) at which the energization is stopped.
Between t6 and t6), the input 5 is half-wave rectified to the vegetable compartment heater 15.
By supplying 0% power supply HH and continuously energizing, the control system is such that the vegetable compartment 8 can be maintained at a more suitable temperature.

[0023]

As described above, according to the present invention,
In a storage room having an internal temperature compensating heater, even if the compressor is operated continuously at a low frequency by inverter control in the outside air temperature range where the internal temperature compensating heater needs to be energized,
The refrigerator can keep the storage room at a more suitable temperature and obtain an energy saving effect.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a form of a refrigerator according to a first embodiment of the present invention and a conventional example.

FIG. 2 is a control block diagram of a first embodiment according to the present invention.

FIG. 3 is a diagram (A) and a diagram (B) showing a control operation example based on the first embodiment according to the present invention.

FIG. 4 is a side sectional view showing a form of a refrigerator according to a second embodiment of the present invention.

FIG. 5 is a control block diagram of a second embodiment according to the present invention.

FIG. 6 is a diagram showing a control operation example based on a second embodiment according to the present invention.

FIG. 7 is a diagram showing an example of a conventional control operation.

[Explanation of symbols]

1 Refrigerator body (insulated box) 2 outer box 3 inner box 4 foam insulation 5, 6 Insulation partition 7 Refrigerator 8 vegetable room 9 Freezer 10 Cold air generation chamber 11 First cooler 12 blower 13 Second cooler 14 blower 15 Vegetable room heater (season heater) 16 compressor 17 condenser 18 Machine room 19 Outside temperature sensor 20 power supplies 21 Half-wave rectification supply circuit 22 Control device (microcomputer) 23 Operation part 24, 25, 26 doors 27 Internal temperature detection sensor

Claims (4)

[Claims] 1. An interior temperature compensating heater for partitioning the inside of a heat-insulating box into a plurality of storage rooms and a freezing room by a partition wall, an outside air temperature detection sensor for detecting an outside air temperature, and the storage room. A refrigerator provided with a control device for controlling the inside temperature compensating heater, a machine room provided at the lower rear of the heat insulation box, and a compressor provided in the machine room, wherein a power supply to the inside temperature compensating heater of the control device is provided. A new half-wave rectification supply circuit is provided in the supply circuit, and a first judgment reference value of the outside air temperature set in advance and a second judgment reference value of the outside air temperature lower than the first judgment reference value are set. However, when the outside air temperature detected by the outside air temperature detection sensor becomes lower than the first determination reference value, half-wave rectified power is supplied to the inside temperature compensating heater to perform continuous energization, and the outside air temperature is If it falls below the judgment standard value of Refrigerator characterized by comprising a control device for controlling to the energization of the degrees compensation heater to the normal power supply. 2. When the operating frequency of the compressor is changed from a low frequency operation to a high frequency operation, a half-wave rectified power supply to the internal temperature compensating heater is controlled to a normal power supply. The refrigerator according to claim 1, wherein the refrigerator is a refrigerator. 3. The refrigerator according to claim 1, wherein an operating portion is provided on a door surface of the refrigerating compartment, and the outside air temperature detecting sensor is provided in the operating portion. 4. An inside temperature compensating heater for partitioning the inside of the heat-insulating box into a plurality of storage chambers and a freezing chamber by a partition wall to warm the storage chamber, and an inside temperature detection sensor for detecting the temperature inside the storage chamber. A refrigerator having a controller for controlling the inside temperature compensating heater, a machine room provided at a lower rear of the heat insulating box, and a compressor provided in the machine room, wherein the inside temperature compensating heater of the controller is provided. A new half-wave rectification supply circuit is provided in the power supply circuit to the first determination reference value of the preset internal temperature and the second internal temperature of the internal temperature lower than the first determination reference value. When a judgment reference value is set and the inside temperature detected by the inside temperature detection sensor is lower than the first judgment reference value, half-wave rectified power is supplied to the inside temperature compensation heater to continuously energize the heater. If the internal temperature falls below the second criterion value, Refrigerator characterized by comprising a control device for controlling to the normal power energization of the serial-compartment temperature compensation heater.