JPS59173674A - 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 cools the inside of the refrigerator by a so-called fan-cooled 1v method and a cooler that directly cools the inside of the refrigerator.

[Technical background of the invention and its problems]

In this type of refrigerator, defrosting of the cooler for the fan cooler is performed by integrating the operating time of the compressor using a timer, and when this reaches a predetermined time value, the operation of the compressor is stopped and the defrosting unit is This is done by forcibly heating the cooler when the heater is energized.On the other hand, in this type of refrigerator, hot gas in the condenser flows into the cooler after the compressor stops operating, causing the refrigerator to heat up. In order to prevent the inconvenience of heating up the inside, some refrigerators are equipped with a valve device between the condenser and the cooler that closes when the compressor stops operating. If a defrosting method is adopted, the temperature of the cooler for direct cooling of the freezer compartment will rise to nearly 0°C, which will have an adverse effect on stored foods.In other words, the compressor operation will have to be slowed down in order to avoid freezing. When it is stopped, the valve device is also blocked, so gas-liquid two-phase refrigerant is trapped in the cooler for the fan cooler and the cooler for direct cooling of the freezer compartment, and in this state, the fan cooler is closed. Since the 7V cooler is heated by the heater, the liquid refrigerant in it evaporates, and the pressure in both cooling chambers increases.

On the other hand, since the direct cooling cooler is located inside the freezing room and the ambient temperature is initially around -18°C, the gas refrigerant condenses due to the increase in internal pressure, and the heat dissipated by this condensation causes the temperature inside the freezing room to rise. That's what I do.

In addition, even if the compressor resumes operation after defrosting, the pressure inside the cooler increases considerably during deregistration, so the degree of pressure drop within the cooler and the degree of evaporation temperature decrease are slow, resulting in a high temperature condition compared to the previous one. The problem was that it lasted for a long time.

In order to solve this problem, a cold storage agent such as potassium chloride is attached to the direct cooling cooler to prevent the temperature from rising, but this is disadvantageous.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and its purpose is to improve the temperature of the cooler for direct cooling when the cooler for Fanku 7V is removed! To provide a refrigerator that can prevent 1.

[Summary of the invention]

The present invention has a configuration in which the compressor continues to operate for a predetermined period of time with the valve device closed when sheathing a cooler for a 7V fan cooler, and then the compressor is stopped and the heater is energized. Prior to energization, the refrigerant in the cooler is removed by suction using a compressor.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 11 to 4. First, in Fig. 1, reference numeral 1 denotes a heat insulating box for a refrigerator, and the inside is vertically divided into a freezing compartment 6 and a refrigerator compartment 4 by a partition wall 2. Inside the freezing compartment 6, there is a so-called direct cooling plate-shaped 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, a cavity 8 is formed in the partition wall 2, and this cavity 8 communicates with both ducts 9 and 10 formed at the back of the freezer compartment 6 and the refrigerator compartment 4, respectively. 9. Circulation path 1 with 10
14f: Configured. 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, there are holes on both upper and lower sides of the front part of the partition wall 2. A first opening into the freezer compartment 5 and the refrigerator compartment 4, respectively.
and second intake ports 13 and 14 are formed, and first and second discharge ports 15 and 16 are formed in both ducts 9 and 10, respectively, opening into the freezer compartment 6 and the refrigerator compartment 4. ,
Reference numeral 17 denotes a fan device disposed deep inside the cavity 8, and is composed of a motor 18 fixed to the insulation box 1 and a fan 19 directly connected to the motor 18. 20 is a first damper device that closes the first intake port 13, and 21 is a duct on the side of the freezer compartment 6? By closing the lower end, the first exhaled air C]
15i is a second damper device that closes the second exhaust port 16, and both of these damper devices 20 and 21 are configured to close using an electromagnet (not shown) as an operating source. This is a sixth 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 it on and off (approximately 2°C).
So on 1. The power is turned off by a refrigerating room temperature detection switch (not shown) which turns off at 5°C.

Next, in FIG. 2 showing Refrigeration Psyche N, 26 is a rotary compressor, and for this compressor 23, a condenser 24. A solenoid valve 25 and a capillary tube 26 as valve devices. The first cooler 5, the second cooler 12, and the check valve 27 are connected in series in this order. The electromagnetic valve 25 is configured to open when energized. Further, the second cooler 12 is provided with a heater 28 for use in register removal.

In the refrigerator configured as described above, when the temperature inside the freezing compartment 6 reaches a predetermined temperature or higher, a freezing room temperature detection switch (not shown) is turned on, so that the compressor 23. i[liB
The motor 1.8 for the valve 25 and fan 19 is energized and started. The refrigerant compressed by the compressor 23 and liquefied by the condenser 24 is transferred to the solenoid valve 25 and the capillary tube 2.
6 into the first and second coolers 5 and 12,
Thereafter, the air is sucked into the compressor 25 again via the check valve 27 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. The air is drawn into the circulation path 11 through the first and second intake ports 13 and 14, and is cooled by the second cooler 12. The cooled air is divided into both ducts 9 and 10 to the first and second outlet ports 15, respectively.
and 16 into the freezing compartment 6 and the refrigerating compartment 4, and eventually enters the circulation path 1 again from the first and second intake ports 16 and 14.
It circulates in this way.

Therefore, the freezer compartment 3 has a first cooler 5 and a second cooler 1.
? The refrigerator compartment 4 is cooled by the cold air from the second cooler 12. When the inside of the refrigerator compartment 4 is cooled to a predetermined temperature, the refrigerator room temperature detection switch is turned on, and the third 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 to the freezer compartment 3, and cooling of the freezer compartment 3 is continued. When the temperature inside the freezer compartment 6 falls below a predetermined temperature, the freezer room temperature detection switch turns off, so the compressor 23. The electromagnetic valve 25 and the motor 18 are de-energized. When the electromagnetic valve 25 is shut off due to power cutoff, the refrigerant in the condenser 24 is confined in the passage leading from the check valve 27 to the electromagnetic valve 25, so that the hot gas in the condenser 24 flows into the cooler 5°12. There will be no inconvenience such as flowing into the interior and heating it. When the temperature inside the freezer compartment 3 rises to a predetermined temperature, the freezer room temperature detection switch is turned on and the operation as described above is restarted. Normally, operations and stops are performed by turning on and off the freezing room temperature detection switch as described above (this operating state is hereinafter referred to as the normal control link).

Now, during normal control operation, frost gradually builds up on the second cooler 12. This H is accumulated by a first timer (not shown) for the operating time of the compressor 23, and is removed every time the accumulated time reaches 8 hours, for example. That is, as shown in the time chart of FIG. 3, when the cumulative operating time of the compressor 26 reaches 8 hours (this point is indicated by (a) in FIG. blocked,
The compressor 23 continues to operate in this state. Due to this operation, both coolers 5 and 12 receive the suction action of the compressor 23 without being supplied with refrigerant from the condenser 24 side, so that the liquid refrigerant inside evaporates and becomes in a low pressure state. Then, when a second timer (shown in Figure 1) that starts timing operation from time (A) detects that a predetermined period of time, e.g., 2 minutes has elapsed from time (A), this time is shown in Figure 6 (
(b)], the heater 28 is energized each time the compressor is compressed. Thereby, the second cooler 12 is heated by the heater 28 and defrosted. In this case, since the inside of both coolers 5.12 is in a low pressure state with no liquid refrigerant, the problem that the amount of gas refrigerant inside the cooler 5.12 increases due to the heat generated by the heater 28 and becomes high pressure will not occur. Therefore, there is no problem that the first cooler 5 performs a condensing action and heat is radiated into the freezer compartment 6. Furthermore, since the first and second damper devices 20 and 21 are coupled and in a closed state, the warm air in the cavity 8 does not flow into the freezing chamber 6. Then, when the second cooler 12 rises to a predetermined temperature due to complete melting of the box, a thermal switch (not shown) detects this and this point is shown by (c) in Figure 6. Compressor 23
The electromagnetic valve 25 is energized, and the power supply 28 is cut off. Then, when a sixth timer (not shown) that starts timing operation from point (c) detects that a predetermined period of time has elapsed from point (c) (this point is shown in FIG. 5), the fan The motor 18 for the first
Then, the second damper devices 20 and 21 are cut off, and the defrosting control period ends and the normal control operation returns. Incidentally, Fig. 4 shows the results of experimental measurements of the temperature change of the first cooler 5 during the defrosting control period (a) to ), and as is clear from this Fig. 4, the defrosting control During the period, the temperature of the first cooler 5 does not increase significantly and reach close to 0° C., and there is no risk of adversely affecting the frozen storage of the food.

FIG. 5 shows another embodiment of the refrigerated psychedelic device μ, which differs from the above-mentioned embodiment in that capillary tubes 29 are provided in both the coolers 5 and 12. Furthermore, FIG. 6 shows another embodiment of the frozen liquid μ.
and the second cooler 5 and 12 are connected in parallel, and the flow path switching solenoid valve 60 and the first auxiliary capillary tube 31 are connected in series with the first cooler 5.
A second auxiliary capillary tube 32 having a higher flow path resistance than the first auxiliary capillary tube 51 is connected in series with the second auxiliary capillary tube 51 .

Although each of the above embodiments has been described using a rotary compressor, a reciprocating compressor having a built-in valve corresponding to the check valve 27 may also be used. Further, the number of coolers is not limited to two, but may be three or more, and various modifications are possible, such as a second cooler for fan cooling may be used to cool only the refrigerator compartment.

[Effect of excuse]

As is clear from the above description, the present invention
When defrosting the second cooler for use, the compressor is first allowed to continue operating for a predetermined period of time with the valve device closed, and then the compressor is stopped and the defrosting heater is energized. The second cooler can be heated in a low-pressure state without liquid refrigerant, and therefore, it is possible to prevent the inconvenience of a condensation action being performed in the first cooler for direct cooling and a large increase in temperature inside the refrigerator.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, in which FIG. 1 is a longitudinal cross-sectional side view of the upper half of the refrigerator, FIG. 2 is a refrigeration cycle μ diagram, FIG. 3 is a time chart diagram, and FIG. The figure is a temperature change diagram of the second cooler during defrosting, and FIGS. 5 and 6 are diagrams corresponding to FIG. 2 showing other different embodiments. In the figure, 3 is a freezer compartment, 5 is a first cooler, 11 is a circulation path,
12 is a second cooler, 19 is a fan, 25 is a rotary compressor, 24 is a condenser, 25 is a solenoid valve (valve device), and 28 is a heater. Figure 1 Figure 2 Figure 3 Figure 4 □ Time plane

Claims (1)

[Claims] 1. A first cooler for direct cooling provided in the refrigerator;
In a refrigerator equipped with a second cooler for indirect cooling provided in a circulation path for circulating indoor air by a fan, and a heater for frost protection that heats this second cooler, the air from the condenser to the A valve device is provided in the passage leading to the cooler,
A refrigerator configured to continue operating a compressor for a predetermined time with a valve device closed during defrosting of a second cooler, and then stop the compressor and energize the heater.