JPS59200175A - 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 equipped with a cooler that directly cools a freezer compartment and a cooler that cools the freezer compartment by a so-called Phicool method.

[Technical background of the invention and its problems]

In this type of refrigerator, defrosting of the fan cooling cooler is performed by a heater, but during defrosting, the air in the circulation path heated by the heater flows into the freezer compartment, causing the temperature of the freezer compartment to rise. There was a problem with rising. Moreover, when the sweetfish melts and becomes water droplets, it is further heated and turns into water vapor, which flows into the freezing chamber and sticks to the direct cooling cooler as ice, which is a unique problem. If it adheres to ice, unlike frost, it sublimes quickly and does not disappear, and it remains as ice in a direct cooling cooler forever, causing a serious problem of poor cooling performance.

[Purpose of the invention]

An object of the present invention is to provide a refrigerator that can prevent hot air from flowing into the freezer compartment during defrosting of a fan cooling cooler, or water vapor from forming ice and adhering to a direct cooling cooler. It is on offer.

[Summary of the invention]

This is intended to prevent warm air and water vapor from entering the freezer compartment.

[Embodiments of the invention]

A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2. First, in Fig. 1, reference numeral 1 is an insulated box of a refrigerator, and the inside is vertically divided by a partition wall 2 into a freezing compartment 3 and a refrigerator compartment 4. Inside the freezing compartment 3, there is a so-called direct cooling plate-like A first cooler 5 is arranged substantially horizontally. Furthermore, doors 6 and 7 for opening and closing the freezer compartment 3 and the refrigerator compartment 4 are pivotally installed at the front of the insulation box 1. On the other hand, the partition wall 2
A cavity 8 is formed in the duct 9 and duct 1 formed at the back of the freezer compartment 3 and the refrigerator compartment 4, respectively.
0 and both ducts? , 10 together with the circulation path 11
It consists of A second cooler 12 is disposed in the cavity 8 of the circulation path 11, and in order to communicate the circulation path 11 with the freezer compartment 3 and the refrigerator compartment 4, both upper and lower sides of the front part of the partition wall 2 are installed. First and second intake ports 15 and 14 are formed in the freezer compartment 3 and the refrigerator compartment 4, respectively, and both ducts 9
First and second exhaust ports 15 and 16, which open into the freezing compartment 3 and the refrigerating compartment 4, respectively, are formed in the front walls of the housings 1 and 10. Reference numeral 17 denotes a fan device disposed in the innermost part of the cavity 8, which includes a motor 18 fixed to the insulation box 1 and this motor 18.
The fan 19 is directly connected to the rotating shaft 18a of the fan 19. 20 is a first damper device that closes the first intake port 13; 21 is a damper device that closes the lower end of the duct 9 on the side of the freezer compartment 5;
In other words, it is a second damper device that closes the first exhaust port 15, and both of these damper devices 20 and 21 are configured to close using an electromagnet (not shown) as an operating source. 22 is a sixth block that closes the upper end of the duct 10.
This is a damper device that uses an electromagnet (not shown) as its operating source, and this electromagnet detects the temperature inside the refrigerator compartment 4 and turns on and off (turns on at about 2°C and turns off at about 5°C). The power is turned off by a refrigerating room temperature detection switch (not shown).

Next, in Fig. 2 showing the refrigeration cycle, 25 is a compressor, this compressor 21CM, and a condenser 2
4. Main capillary tube 25. The first auxiliary capillary tube 26 and the second cooler 12 are connected in series, and the first auxiliary gear capillary tube 2
6 and a solenoid valve 27 in parallel with the second cooler 12. A series circuit of the second auxiliary capillary tube 28 and the first cooler 5 is connected. The solenoid valve 27 is configured to open when energized, and in order to allow the refrigerant to flow to the first cooler 5 side when the solenoid valve 27 is opened, the flow path resistance of the first auxiliary capillary tube 26 is is set to be larger than that of the second auxiliary capillary tube 28, for example, about six times. 29 is a gradual opening heater attached to the second cooler 12.

In the refrigerator configured as described above, when the temperature inside the freezer compartment 3 reaches a predetermined temperature or higher, the compressor 23 and the motor 18 for driving the fan 19 are energized and started. The refrigerant compressed by the compressor 23 and liquefied by the condenser 24 is
It flows into the second cooler 12 through the main capillary tube 25 and the first auxiliary capillary tube 26, evaporates there, exhibits a cooling effect, and is sucked into the compressor 23 again and compressed, thus circulating. On the other hand, since the first to third damper devices 20 to 22 are both cut off and in the open state shown by the solid line in FIG. 1, when the motor 18 starts and the fan 19 rotates as described above, the freezing chamber 5 and the air in the refrigerator compartment 4 is drawn into the circulation path 11 from the first and second @bunguchi 13 and 14, and is cooled by the second cooler 15. The cooled air is divided into both ducts 9 and 10 and discharged into the freezer compartment 3 and the refrigerator compartment 4 from the first and second outlet ports 15 and 16, respectively, and then the first and second intake ports 13. and 14 and is sucked into the circulation path 11 again, thereby cooling the freezer compartment 3 and the refrigerator compartment 4.

When the inside of the refrigerator compartment 4 is cooled to a predetermined temperature, the fifth damper device 22 is energized and enters the closed state shown by the two-dot chain line in FIG. After this, cold air is supplied only into the freezer compartment 3, and cooling of the freezer compartment 5 continues. When the temperature inside the freezer compartment 3 falls below a predetermined temperature, the compressor 23 and the motor 18 are cut off. Then, when the temperature inside the freezer compartment 3 rises to a predetermined temperature, the operation as described above is started again.

Normally, the operation and stop are performed as described above, and the freezer compartment 3 and the refrigerator compartment 4 are cooled and maintained at a predetermined temperature, respectively (this operating state is hereinafter referred to as normal control operation).

Now, frost gradually adheres to the second cooler 12 due to the normal control operation. This frost is removed by a defrosting operation that is performed every time the cumulative operating time of the compressor 26 reaches 8 hours. That is, when the cumulative operating time of the compressor 23 reaches 8 hours, the first and second damper devices 20 and 21 are energized and enter the closed state shown by the two-dot chain line in FIG. Further, the solenoid valve 27 is energized and opened, and due to the opening of the solenoid valve 27, the refrigerant that had previously flowed into the cooler 12 of the dfa2 passes through the second auxiliary capillary tube 28 to the first
The second cooler 12
There is almost no flow inside.

Defrosting of the second cooler 12 is started in the above state, but the defrosting is performed by energizing the defrosting heater 29 and turning the motor 1
This is done by cutting off the power to 8. The heat generated by the defrosting heater 29 melts the frost adhering to the second cooler 12 and turns it into water droplets, some of which evaporate into water vapor. Furthermore, the air around the second cooler 120 is also heated and becomes warm. However, since the first and second damper devices ff20 and 21 are in a closed state, warm air and water vapor will not enter the freezer compartment 5, and the temperature of the freezer compartment 3 will rise and the first There is no risk of water vapor turning into ice and adhering to the cooler 5. Therefore, during defrosting, the freezer compartment 5 is kept cooled to a low temperature by the first cooler 5. When the frost in the second cooler 12 completely melts and the temperature rises to, for example, about 20°C, a temperature sensor (not shown) detects this and the solenoid valve 27 and the defrosting heater are activated. 29 was cut off,
This causes the solenoid valve 27 to return to its original closed position. Therefore, the refrigerant that had been supplied to the cooler 5 of the defrosting liner 1 now flows into the second cooler 12, but the fan 19 does not rotate immediately and the second cooler 12 cools down to -10°C. When the temperature drops, the temperature sensor detects this and returns to the normal control operation in which the first and second damper devices 20 and 21 are opened and the motor 18 is energized to rotate the fan 19.

In addition, if you want to quickly freeze food in the first cooler 5, you can turn the solenoid valve 2 on by operating a push button switch (not shown).
7 is opened so that refrigerant can be supplied to the first cooler 5.

Figure 3 shows the second embodiment, and the difference from Figure 2 is the solenoid valve 2.
7 is connected in series with the second cooler 12, and the flow path resistance of the first auxiliary capillary tube 26 is made smaller than that of the second auxiliary capillary tube 28.

4 and 5 show the third and fourth embodiments, in which the first and second coolers 5 and 12 are connected in series, and the second auxiliary capillary tube 28 is connected to the second cooler. 1
The auxiliary capillary tube 26 and the first cooler 5 are connected in parallel. The one in FIG. 4 is constructed so that when the solenoid valve 27 is opened, the refrigerant flows to both the first and second coolers 5 and 12, and when it is closed, the refrigerant flows only to the second cooler 12. , FIG. 5 shows that when the solenoid valve 27 is closed, the refrigerant flows into both the first and second coolers 5 and 12,
It is configured so that it flows only to the second cooler 12 when it is opened.

FIG. 6 shows a fifth embodiment, in which the first and second coolers 5 and 12 are connected in series, and a bypass path is provided in parallel with the second auxiliary capillary tube 28 and the second cooler 12. 60 is connected, and when the solenoid valve 27 is closed, the refrigerant is supplied to the first
The refrigerant flows to both the second coolers 5 and 12, and the refrigerant flows only to the first cooler 5 when opened.

FIG. 7 shows a sixth embodiment, in which a second cooler 12 is provided in the duct 9 at the back of the freezer compartment 6, and the first damper device 20 in FIG. When defrosting the container 12, hot air and water vapor flow upward and do not flow toward the cavity 8 located below, so the second damper device 21
This prevents hot air and water vapor from flowing into the freezer compartment 3.

FIG. 8 shows a seventh embodiment, in which the first cooler 5 is connected to the freezer compartment 3.
It is placed on the bottom of the .

〔Effect of the invention〕

As is clear from the above description, the present invention provides a cooling system equipped with a damper device that closes the circulation path during defrosting of the second cooler.
This prevents warm air and water vapor from flowing into the freezing chamber during defrosting of the second cooler, thereby preventing the temperature inside the freezing chamber from rising.
It is possible to prevent the inconvenience of ice adhering to the first cooler.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of the upper half of a refrigerator showing a first embodiment of the present invention, FIG. 2 is a refrigeration cycle diagram of the same embodiment, and FIGS. A view corresponding to FIG. 2 showing the fifth embodiment, and FIGS. 7 and 8 are views corresponding to FIG. 1 showing the sixth and seventh embodiments of the present invention, respectively. In the figure, 3 is a freezer compartment, 4 is a refrigerator compartment, 5 is a first cooler, 1
1 is the circulation path, 12.13 is the first. second intake port, 14.
15 is the first. a second exhaust port; 17; a fan device; 20.
21 is the first. a second damper device, 26 a compressor;
27 is a solenoid valve, 29 is a heater for removing n. Applicant: Tokyo Shibaura Electric Co., Ltd. Figure 1 Figure 2 Figure 4 Figure 3 Figure 6 Figure 4 Figure 4 Figure 5 War

Claims (1)

[Claims] 1. A first cooler for direct cooling provided in the freezing chamber, a circulation path for circulating air in the freezing chamber, a second cooler provided in this circulation path, and a second cooler provided in the circulation path. A refrigerator which is provided with a damper device which is placed in a closed state when the second cooler is defrosted.