JPS5974477A - 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] (a) Field of the Invention In an apparatus in which air cooled by a main cooler provided in a cooling chamber is circulated to a freezing chamber and a refrigerator compartment using a blower, the freezing chamber is directly cooled. The present invention relates to a refrigeration system equipped with an auxiliary cooler.

(B) Background technology and its problems Air that is cooled by a cooler stored in a cooler room between the compartments is equipped with a freezer compartment and a refrigerator compartment, and is circulated from the freezer compartment to the refrigerator compartment using a blower, and is directly cooled to the wall of the freezer compartment. A method in which a type cooler is installed so that refrigerant flows in series between both coolers, the operation of the blower is controlled according to the temperature of the refrigerator compartment, and the operation of the electric compressor is also stopped when the temperature of the freezer compartment is reached, thereby stopping the operation of the refrigerator. The one is from 1973-386.
It is publicly known from Publication No. 18. However, in this case, the operation of the electric compressor is stopped during the defrosting operation, and it is not possible to prevent the temperature of the freezer compartment from rising during the defrosting operation.

It also has a freezer compartment and a refrigerator compartment, and the freezer compartment is equipped with a direct cooling type cooler on its inner wall, and a blower circulates the air cooled by another second cooler installed in the cold air circulation path to the freezer compartment. Normally, only when defrosting is performed by flowing hot gas into the second cooler, the refrigerant is flowed into the direct cooling type cooler to cool the freezer compartment. Japanese Patent Publication No. 52-44825 discloses a system in which a cooler is provided to cool the refrigerator independently of the freezing chamber. With this method, it is possible to control the temperature rise in the freezer compartment while the second cooler is defrosting, but two coolers are required for the freezer compartment, and three coolers are required for the refrigerator-freezer. It becomes expensive. In addition, the electric compressor continues to operate until the compartments in the freezer and refrigerator compartments are sufficiently cooled, and when the temperature in the refrigerator compartment reaches a predetermined low temperature, the blower is stopped and the second cooler is heated. Since the method is to defrost by flowing gas and stop the operation of the electric compressor when the freezer compartment reaches a predetermined temperature, it is quite difficult to control the temperature in consideration of the defrosting of each cooler.

(c) Purpose of the Invention The freezing and refrigerating compartments are cooled by circulating air cooled by a single main cooler installed in the cooling room using a blower, the main cooler being a defrosting heater. During this defrosting operation, the harmful effects of temperature rise in the freezer compartment are prevented, and furthermore, during the cooling operation cycle, 'Il￥.

When the dynamic compressor stops, liquid refrigerant in the condenser flows into the cooler, causing adverse effects due to temperature rise in the freezer compartment and deterioration of cooling operation efficiency, and liquid refrigerant flowing into the main cooler causes defrosting heater failure. This is to improve the disadvantages of increasing the wattage or extending the defrosting time.

B) Examples of the invention will be explained with reference to the drawings. In Figure 1, (1) is, for example, a so-called two-temperature refrigerator, which has a freezer compartment (3) kept at freezing temperature by a partition wall (2), and a refrigerator compartment kept at a temperature higher than the freezing point. (4) Sections are formed. (5)
is a cooling chamber (3) formed between the bottom wall of the freezing chamber (3) and the partition wall (2), which is provided above the partition wall (2) with a distance therebetween.
A main cooler (7) is installed inside the main cooler (6). (8) is an electric blower that circulates the air cooled by the main cooler (7) between the freezer compartment (3) and the refrigerator compartment (4). Cold air is sent directly to the freezer compartment (3) from the front of the fan (8). It is discharged and stored in the refrigerator (
4), the cold air that has descended through the duct (9) is sent out and circulated as shown by the arrow. 00) is a damper device that opens and closes the cold air discharge port of the duct (9) to the refrigerator compartment (4) according to the temperature of the refrigerator compartment (4). (11) is an electric compressor,
(1 hot water is a condenser, and (13) is a so-called roll-bond type cooler in which a refrigerant passage is formed between two metal plates, or a so-called tube-on-sheet type cooler in which a refrigerant tube is arranged thermally conductively in a metal plate. In this example, the auxiliary cooler consists of a freezer compartment (
3) It is provided like a shelf so that articles can be placed inside.

FIG. 2 shows the refrigerant circuit. (141 (151 is the first and second capillary tube, fl 6i (17
) are the first and second solenoid valves, θ is the defrosting heater of the main cooler (7), 09 is the accumulator, and (20) is the reverse 1F valve. FIG. 3 shows the electrical circuit. In this, (21) is an AC power supply, (24 is substantially a freezing chamber (3)
) is a temperature control device that controls the temperature of the freezer compartment (3), the temperature of the circulating cold air to the freezer compartment (3), or the temperature of the cooler (
7) Detects the temperature and opens and closes the contacts. (It is a two-target defrosting timer device and has a switch (23B) whose contacts are switched by a cam that operates based on the rotation of the electric motor (23A). (
24) is the defrost relay switch (24A) (2413)
(24C) (24D) (24E). (The two are defrost end thermostats that adjust to the defrost end temperature set for the main cooler (7).

In this configuration, in a normal cooling cycle, when the temperature control device (22) closes the contact, the electric compressor (11
) is operated, the switch (23B) is closed to the contact (Al, and the relay (24) is de-energized and its switches (24A) (24C) are closed and the switch (2413) is closed.
) (24D) (24B) are open, the electric blower (
8) is operated, the solenoid valve (16) is energized to open the refrigerant passage, and the solenoid valve (17) closes the refrigerant passage, so the refrigerant is transferred to the electric compressor (I+1-condenser (12)-first solenoid valve). (
16) - First capillary tube (14) - Main cooler (
7) - Achievement regulator 0 - check valve (2 - electric compressor 01) repeats circulation, and air cooled by the main cooler (7) circulates in the freezer compartment (3) and refrigerator compartment (4). and cooled down. When the temperature control device (2) detects a predetermined lower limit temperature, the contacts open and the electric compressor 01 and the blower (8) stop operating, and the first solenoid valve (1G) becomes de-energized to close the refrigerant passage. . In other words, when the electric compressor (11) is stopped (1-), the solenoid valves (16) (17) are closed (reverse 1).
, the valve (20) shuts off the pressure acting from the electric compressor (0]) to the refrigerant passage on the outlet side of the main cooler (7), so that pressure is separated between the high pressure side and the low pressure side of the refrigerant circuit. Therefore, the liquid refrigerant in the condenser (+2) can be prevented from flowing into the main cooler (7) and the auxiliary cooler (13) while the electric compressor (11) is stopped. If the compressor of the electric compressor (11) is a rotary type, the pressure on the suction side and the discharge side is separated by the reverse valve (a), but if it is a reciprocating type, the pressure is separated in the pulp part of the compressor. May be omitted. Temperature control device (22
When detects a predetermined upper limit temperature, the electric compressor θ1) and the electric blower (8) are started as described above to close the contacts, and the solenoid valve (16) is energized to perform cooling operation. The defrosting timer device e3) integrates the cooling operation time, and when the predetermined integration is reached, the switch (23B) switches to the contact (B), the relay (24) is energized through the thermostat (251), and the switch (24A,) ( 24C) and open the switch (2
4B) Close (24D) (24E). Therefore, the electric motor (23A) is short-circuited and stopped, the heater (18) is energized to heat the main cooler (7), and the solenoid valve (16) is de-energized to close the refrigerant passage and the solenoid valve (+7) is energized and opens the refrigerant passage. Since the switch (24, E) is closed, the electric compressor (11) is closed regardless of the temperature sensing operation of the temperature control device (22).
is driven. Meanwhile, the blower (8) is stopped. Therefore, the refrigerant is transferred from the electric compressor to the condenser (1
2nd capillary tube (15i-auxiliary cooler 03)-
It circulates through the accumulator (19 - reverse 1-hi valve (20) - electric compressor (11), and the freezer compartment (3) is connected to the auxiliary cooler (13).
) to maintain a temperature lower than the upper limit temperature in a substantially normal cooling operation state. When the temperature of the main cooler (7) rises to 10℃, for example, the thermostat) 2 opens the contact (so the relay (2) becomes de-energized and the switch (24A
) (24C) is the close switch (24B) (24D)
(24E) opens and the defrosting operation ends. and electric motor (
The short circuit of the heater (23A) is released and the motor (23A) has a resistance value that is sufficiently larger than the resistance value of the heater (1~), so the motor (23A) starts and after a few minutes of time-safety, the switch (23A) is turned off.
23B) returns to contact (A). During this time-safe period, the blower (8) remains stopped. During the defrosting operation, the freezer compartment (3) is cooled by the auxiliary cooler 03), and if it is not cooled to the predetermined lower limit temperature, the temperature control device (2)
When the circuit is closed and the defrosting operation is completed, that is, the defrosting relay 04) is de-energized, the electric compressor (11) continues to operate and the solenoid valve (+6) opens the refrigerant passage and the solenoid valve 0η is closed.
closes the refrigerant passage, so the main cooler (
7), the refrigerant begins to flow, and after the time-safe period has elapsed, normal cooling operation resumes. The thermostat (25) closes when the main cooler (7) is cooled to approximately 0° C. or lower.

During this time-safe period, the blower (8) is stopped, so the air at the high temperature of the main cooler (7) immediately after defrosting does not circulate to the freezer and refrigerator compartments, which is preferable in terms of cooling effect. The temperature control device (22 detects the freezing room temperature, the auxiliary cooler 03) controls the temperature of the freezer compartment (3) during defrosting operation.
If the compressor is cooled to a predetermined lower limit temperature or lower, the electric compressor 01) will stop because the temperature control device (22) is open at the end of the defrosting operation.

The solenoid valve (16) may be provided between the first capillary tube 04) and the main cooler (7), and the solenoid valve 07) may be provided between the second capillary tape (19 and the auxiliary cooler 03). This is within the scope of the present invention.

(E) Effects of the Invention In the present invention, the freezer compartment and the refrigerator compartment are cooled with air cooled by a single main cooler, and the main cooler is being defrosted in an electric compressor operation control system using freezing room temperature control. This prevents the freezing room temperature from rising and the ice cream becoming soft (there are fewer coolers and temperature control is simple. Also, each solenoid valve closes when the electric compressor stops, so each cooler is The high-temperature liquid refrigerant flowing into the condenser may raise the freezing room temperature or impair the cooling operation rate (furthermore, if the high-temperature liquid refrigerant flows into the main cooler during defrosting operation, this liquid refrigerant may However, the defrosting heater has to be upgraded in order to have the latent heat of vaporization, and the defrosting time is longer, but the present invention can solve these problems.

'4. Brief Description of the Drawings Fig. 1 is a longitudinal sectional side view of a refrigerator-freezer, Fig. 2 is a refrigerant circuit diagram of the present invention, and Fig. 3 is an electric circuit diagram of the present invention.

(3)... Freezer room, (4)... Refrigerator room, (7)
...-Main cooler, (8)...Electric blower, (11)
・・・Electric compressor, (Sakura...Condenser, (13)・
...Auxiliary cooler, (14)...First capillary tube, f+51...Second capillary tube, (
16)...First solenoid valve, 07)...Second solenoid valve,
(221... Temperature control device.

Applicant: Sanyo Electric Co., Ltd. and 1 other person Figure 1 difference, \

Claims (1)

[Claims] 1. In a device that circulates the air cooled by a main cooler installed in the cooling chamber to the freezer and refrigerator compartments using a blower,
An auxiliary cooler that directly cools the freezing compartment, a defrosting heater of the main cooler, and an electric compressor and the blower are operated so as to perform temperature control operations that are substantially based on the temperature of the freezing compartment. a temperature control device for controlling the temperature, a refrigerant circuit in which refrigerant exiting the condenser flows to the main cooler through a first solenoid valve and a first capillary tube during cooling operation, and a defrosting circuit that energizes the defrosting heater. In operation, the refrigerant leaving the condenser is
A refrigerant circuit is provided in which the refrigerant flows through the auxiliary cooler through a solenoid valve and a second capillary cheep to the outlet side of the main cooler, and the first and second solenoid valves are configured to operate the electric compressor in the cooling operation. A refrigeration system configured to close the refrigerant passage when stopped.