JPS62202978A - Freezing 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] [Object of the Invention] (Industrial Field of Application) The present invention relates to a refrigerator-freezer, and in particular, to a refrigerator-freezer that cools the freezer compartment by an intercooling method and a direct cooling method. Regarding improvements.

(Prior Art) In a refrigerator-freezer equipped with a freezer compartment and a refrigerator compartment, the conventional method is to cool the interior of the freezer compartment.

There is a direct cooling method in which a cold HL device is placed directly in the cold 2I air, and a cooling room that houses a cold fJl device inside the freezing room is provided separately from the freezing room, and the air in the freezing room is passed through the above cooling room. This was done to create forced convection. A so-called intercooling method is used. And recently.

For purposes such as freezing food etc. in a short time.

Freezer-refrigerators that combine direct cooling and intercooling methods have also appeared.

A refrigerator-freezer that combines a direct cooling system and an intercooling system is usually constructed as shown in FIG.

That is, the inside of the freezing/cold body 1 is partitioned into upper and lower parts by a partition wall 2, and a freezing chamber 3 is formed in the upper part, and a refrigerating chamber 4 is formed in the lower part. A cooling chamber 5 is provided within the partition wall 2, and a cooler 6 for indirect cooling is housed within the cooling chamber 5. The back side of the cooling chamber 5 is communicated with the freezing chamber 3 and the refrigerating chamber 4, and a fan 7 for forced convection is housed in this communication path. Also.

The front side of the cooling compartment 5 is also communicated with the freezing compartment 3 and the refrigerator compartment 4,
With the help of a fan 7, the air in the freezer compartment 3 and the air in the refrigerator compartment 4 are circulated while being brought into contact with the cooler 6. On the other hand, in the freezer compartment 3, a cooler 8 for direct cooling is arranged, which is used to freeze food or the like in a short time or to make ice.

Also, at the bottom of the housing 1 is a compression I! 9 is arranged, and furthermore, a capacitor 10 is arranged on the back side of the housing 1.

The above-mentioned elements are connected as shown in FIG. 6 to constitute a refrigeration cycle. Namely.

The discharge port of compression 1fi9 is connected to condenser 10. Capillary tube 11 as first constrictor. Refrigerant pipe 12 of cooler 8. Capillary tube 13 as second constrictor.
It is connected to the suction port of the compressor 19 via the cooler 6.

The compressor 9 is driven by a variable frequency power source 14. As mentioned above, the reason why the direct cooling cooler 8 is placed upstream of the indirect cooling cooler 6 and the capillary tube 13 is interposed between the two coolers is that the surface temperature of the cooler 6 is lower than the temperature. This is to maintain the surface temperature of the cooler 8 at a constant level, thereby preventing HIM on the surface of the cooler 8.

(Problem that the invention attempts to solve) In a refrigerator/freezer configured as above.

For example, if you want to make ice within a short time.

Control is performed to increase the frequency of the variable frequency power supply 14 to increase the amount of refrigerant flowing into the refrigerant pipe 12 of the cooling fJl unit 8. However, since the capillary tube 13 and the like are inserted on the downstream side of the cooler 8.

There was a problem in that the pressure inside the cold Q[12] could not be lowered that much, and as a result, the time required to make ice was relatively long.

Therefore, an object of the present invention is to provide a refrigerator-freezer that can improve quick freezing characteristics without impairing the characteristics of a system that uses both a direct cooling system and an intercooling system.

[Structure of the invention] (Means for solving problems).

According to the present invention, a refrigerant passage for rapid freezing is provided in the cooler for direct cooling disposed in the freezer compartment, separate from the refrigerant passage through which refrigerant flows during steady operation.

In addition, a quick-freezing designation switch is provided, and the quick-freezing refrigerant passage is switched in response to the operation of this switch to cool the direct cooling cooler to a temperature equal to or lower than the temperature of the indirect cooling cooler. A refrigerant flow system is provided for flowing refrigerant.

(Function) When the quick freezing designation switch is operated, the refrigerant flows into the quick freezing refrigerant passage provided in the direct cooling cooler in response to this, and as a result, the direct cooling cooler becomes indirect cooling W.
The a! cooled to a degree.

(Example) The present invention will be described in detail below with reference to one drawing.

FIG. 1 is a refrigeration cycle diagram of a refrigerator-freezer according to an embodiment of the present invention. In this figure, the same parts as in FIG. 6 are designated by the same reference numerals. therefore.

A detailed explanation of the seasonal parts will be omitted.

In this embodiment, as shown in FIG. 2, the direct cooling cooler 8a disposed in the freezer compartment has a quick freezing refrigerant passage separate from the refrigerant pipe 12 that constitutes the refrigerant passage during steady operation. A refrigerant pipe 21 constituting the refrigerant pipe is embedded. One end of this refrigerant pipe "21" is connected to the outlet of the indirect cooling cooler 6 via a capillary tube 22 as a constrictor.
9 and is also connected to the outlet of the cooling unit 6 via a solenoid valve 23. The solenoid valve 23 used is one that normally maintains an "open" state and switches to a "closed" state when energized.

On the other hand, a switch 24 for specifying the rapid cooling method, which is controlled to be turned on and off by manual operation, is provided at an appropriate position in the casing of the refrigerator/freezer j1. Then, when this switch 24 is turned on, the response is 1! A circuit (not shown) is provided that energizes the magnetic valve 23 and increases the frequency of the variable frequency power supply 14 by a predetermined amount.

With such a configuration, during steady operation, the compressors 9 to 9
The refrigerant flows through a path from the condenser 10 to the capillary tube 11 to the refrigerant pipe 12 provided in the direct cooling cooler 8a to the capillary tube 13 to the indirect cooling cooler 6 to the solenoid valve 23 to the compressor 9. Therefore, as in the conventional case shown in FIG. 5, the surface temperature of the cooler 8a is higher than that of the cooler 6.
In other words, the surface temperature of the cooler 8a is slightly higher than the surface temperature of 1! Operated in frost-free conditions.

When performing such steady operation, for example, if you want to make ice within a short time, do the following. That is, an ice cube tray is filled with water and placed on the cooler 8a. Next, the rapid freezing designation switch 24 is turned on.

When the switch 24 is turned on in this way, the solenoid valve 23
is switched to "°Closed'°" and the frequency of the variable frequency power supply 14 increases by a predetermined amount.Therefore, the refrigerant flow m increases.

In addition, this refrigerant is transmitted from the compressor 9 to the condenser 10 to the capillary tube 11 to the refrigerant tube 12 of the cooler 8a to the capillary tube 13 to the cooler 6 to the capillary tube 22 to the refrigerant tube 21 of the cooler 8a to the compressor 9. Flows in the path. cold t
The upstream side of the S pipe 21 is constricted by a capillary tube 22, and the downstream side communicates with the suction port of the compressor 9, so that the pressure inside the refrigerant pipe 21 is maintained at a sufficiently low pressure. For this reason,
As a result, evaporation of the refrigerant within the refrigerant pipe 21 is promoted.

The cooler 8a for direct cooling is cooled to a lower temperature than the cooler 6 for indirect cooling. Therefore, compared to simply increasing the frequency of the variable frequency power source, the ice making time can be reduced by, for example, 10 to 15%.

FIG. 3 shows a refrigeration cycle diagram of a refrigerator-freezer according to another embodiment of the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals. Therefore, a detailed explanation of the parts where Φ is repeated will be omitted.

In this embodiment, a bypass pipe 25 is connected between the outlet of the capillary tube 11 and the inlet of the cooler 6, and the bypass pipe 25 is normally kept in a "closed" state and is "closed" when energized. An M!1 valve 26 which switches to the 'state' is inserted.

The electromagnetic valve 26 is also energized in response to the ON operation of the quick freezing designation switch 24.

Even with this configuration, the cooling W unit 8a can be cooled to a sufficiently low temperature during quick freezing using the same principle as in the embodiment described above, and the quick freezing characteristics can be improved.

FIG. 4 shows a refrigeration cycle diagram of a refrigerator-freezer according to a slightly different embodiment of the present invention.
The same parts as those in the figure and FIG. 3 are indicated by the same reference numerals. Therefore, a detailed explanation of the overlapping parts will be omitted.

In this embodiment, a capillary tube 11 and a refrigerant tube 12 are used.
It always maintains the “open” state between the
A solenoid valve 27 that switches to the "closed" state is interposed, one end of the refrigerant pipe 21 is directly connected to the inlet of the cooler 6, and the other end is connected to the outlet of the capillary tube 11 via the capillary tube 28. In response to the ON operation of the quick freezing designation switch 24, the electromagnetic valve 27 is energized and the frequency of the variable frequency power supply 14 is increased by a predetermined amount.

With this configuration, almost no refrigerant flows into the refrigerant pipe 21 due to the presence of the capillary tube 28 during steady operation. Then, the switch 24 is turned on (1) to perform rapid freezing.

The solenoid valve 27 switches to 'closed', and all of the refrigerant is turned off.
The refrigerant flows through the path from the abili tube 28 to the refrigerant pipe 21. In this case, the pressure inside the refrigerant pipe 21 is maintained at a sufficiently low pressure due to the presence of the capillary tube 28. Therefore, the cooler 8a is used during steady operation.

For example, it is cooled to a low temperature of about 10°C. Therefore, the same effects as in the embodiment described above can be obtained. In this embodiment, when the cooler 6 is connected to the air heater 1, the rotation speed of the fan 7 may be controlled.

In each of the embodiments described above, the direct cooling cooler 8a is not limited to the one having the structure shown in FIG. It is also possible to use a combination of overlapping containers. Further, in each of the above-described embodiments, the compressor is driven by a variable frequency power source, but the present invention can also be applied to one in which the compressor is simply driven by a commercial power source.

[Effects of the Invention] As described above, according to the present invention, in a product that uses a direct cooling method and an intercooling method in combination, the rapid freezing characteristics can be improved without impairing the advantages of the combined use. We can provide a refrigerator/freezer.

[Brief explanation of drawings]

Fig. 1 is a refrigeration cycle diagram of a refrigerator-freezer according to an embodiment of the present invention, Fig. 2 is a perspective view of a direct cooling cooler built into the refrigerator-freezer, and Fig. 3 is another embodiment of the invention. Fig. 4 is a refrigeration cycle diagram of a refrigerator according to another embodiment of the present invention, and Fig. 5 is a refrigeration cycle diagram of a refrigerator according to another embodiment of the present invention. A sectional view of the refrigerator, FIG. 6 is a refrigeration cycle diagram of the refrigerator-freezer. 1... Freezer cold aS housing, 3... Freezer compartment, 4... Refrigerator compartment. 5... Cooling room, 6... Cooler for indirect cooling, 7...
・Fan for forced convection, Ba...cooler for direct cooling, 9...pressure Wi machine, 10...condenser, 11.1
3.22゜28... Capillary tube as a constrictor, 12... Refrigerant pipe serving as a refrigerant passage during steady operation, 2
1... Refrigerant pipe for quick freezing, 23.26.27...
solenoid valve. 24... Switch for specifying quick freezing. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 5 Figure 6

Claims (1)

[Claims] A freezing room, a cooling room provided adjacent to the freezing room,
A first cooler for indirect cooling disposed within the cooling chamber, a second cooler for direct cooling disposed within the freezing chamber, and air inside the freezing chamber is circulated through the cooling chamber. and means for causing the refrigerant condensed in the condenser to flow through a basic path consisting of the first constrictor, the second condenser, the second constrictor, and the first condenser during steady operation. In the refrigerator-freezer, the second cooler includes a quick-freezing refrigerant passage provided separately from the passage serving the basic passage, a quick-freezing designation switch that is selectively operated, and a quick-freezing designation switch that is selectively operated. and a refrigerant flow system that switches in response to an operation and causes the refrigerant to flow through the rapid freezing refrigerant passage in order to cool the second cooler to a temperature equal to or lower than the temperature of the first cooler. A refrigerator-freezer that is characterized by the following features: