JP3028387B2 - Direct cooling chest type freezer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct-cooled chest type freezer for storing frozen foodstuffs in cold storage.

[0002]

2. Description of the Related Art Conventionally, a chest type freezer has been used as an apparatus for keeping frozen foods in a cold storage as described above.
As the structure of the chest type freezer, a direct cooling type in which a cooler and an inner box are used in common is generally used, and is formed substantially as shown in FIGS. 5 and 6.

In FIG. 1, reference numeral 41 denotes a box-shaped freezer main body, and reference numeral 42 denotes a lid that opens and closes up and down. 43 is an outer plate of a freezer, 44 is an inner box, 45 is a heat insulating material, and 46 is a cooling pipe buried in contact with the inner box 44. The cooling pipe 46 corresponds to an evaporator of the refrigerating apparatus, and has a structure in which the inner box 44 is cooled by the evaporating action of the refrigerant in the pipe, and the inside is cooled and kept cool.

In such a freezer, moisture in the outside air which enters when the upper lid 42 is opened or closed or moisture evaporated from frozen food stored in the inner box 44 becomes frost to form frost. Attaches to box 44. Therefore, the amount of frost adhering to the inner box 44 increases as the operation time of the freezer increases.

When a large amount of frost adheres to the inner box 44, the cool air from the cooling pipe 46 reaches the inner box 44 and the inside of the inner box 44 via the attached frost. A disadvantage arises in that the cooling effect is impaired, the refrigerating capacity is reduced, and the inside of the inner box 44 cannot be maintained at a predetermined temperature. For this reason, it is necessary to occasionally scrape off the attached frost with a spatula or the like.

However, this method is troublesome and troublesome, and it is difficult to completely remove frost. If a sharp instrument or the like is used instead of a spatula or the like, the inner box 44 of the freezer may be damaged or the cooling pipe 46 may be damaged.

Next, as a prior art of the same type of direct cooling type chest freezer, there is an invention described in Japanese Patent Publication No. 3-41753. This freezer has a first evaporator for cooling the storage and a second evaporator for frosting, and the second evaporator is provided along the periphery of the opening of the storage.

However, also in this freezer, the frost moves from the second evaporator for frost formation to the inner surface of the storage corresponding to the position of the first evaporator as the lid is opened and closed, and is substantially the same as in the conventional example. Frost attached to the freezer increases and impairs the cooling effect,
It has the drawback of lowering the refrigeration capacity.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its purpose is to surely prevent frost from adhering to the inner box of a freezer and to require manual operation. An object of the present invention is to provide a highly reliable direct-cooled chest freezer that can surely perform defrost without performing the above operation, always obtain a good cooling effect, and further improve the life.

[0010]

Means for Solving the Problems In the inner box of a freezer provided with a cooling pipe on the outside, defrosting and defrosting are performed at a position equal to or lower than the highest position of the cooling pipe. This is a direct cooling type chest freezer provided with a frosting / defrosting evaporator. The temperature of the frosting / defrosting evaporator is the direct cooling type chest freezer set lower than the temperature of the cooling pipe.

Further, the frosting / defrosting evaporator is the direct cooling type chest freezer connected to an evaporating dish for evaporating water generated by the defrosting outside the inner box. Further, the frosting / defrosting evaporator is the direct-cooling type chest freezer provided with the length direction up and down.

The frosting / defrosting evaporator is the direct-cooled chest type freezer disposed above a machine room accommodating a compressor. The frosting / defrosting evaporator is the direct cooling type chest freezer having a control circuit for stopping the compressor for a predetermined time in relation to the operation of the frosting / defrosting evaporator.

[0013]

[Operation] When this direct cooling type chest freezer is operated,
Moisture contained in foods and the like stored in the inner box of the same freezer, or moisture in the outside air that enters when the freezer is opened and closed freezes and tends to adhere to the inner box as frost.
However, since the frost / defrost evaporator is set at a lower temperature than the cooling pipe provided outside the inner box, a vapor pressure difference occurs, and the frost concentrates on the frost / defrost evaporator. As a result, frost formation on the inner surface of the inner box is prevented.

Since the frosting / defrosting evaporator is provided in the inner box at a position equal to or lower than the highest position of the cooling pipe, the evaporator is not used when the lid is opened and closed or when the packing is removed. The temperature difference from the cooling pipe can be stably maintained without being affected by the outside air, and the capacity of the compressor used for providing the temperature difference may be small.

Next, when defrosting is performed by the frosting / defrosting evaporator, water generated by the defrosting is moved to the evaporating dish, where it is evaporated. Since the frosting / defrosting evaporator is provided up and down in its length direction, defrosting water at the time of defrosting is effectively caused to flow down to the evaporating dish, and there is no scattering due to dripping.

[0016]

1 and 2, reference numeral 1 denotes a main body of a DC-type chest freezer, 2 denotes an upper opening, and 3 denotes a lid. Reference numeral 4 denotes an outer plate provided with a radiating pipe 5 serving as a condenser so as to be in contact with the outer plate. Reference numeral 6 denotes an inner box, and a cooling pipe 7 as an evaporator is provided so as to be in contact therewith.

Numeral 8 denotes a heat insulating material such as polyurethane, for example, which is filled between the above-mentioned members 5 and 7. A frosting / defrosting evaporator 9, which is also an evaporator, is provided vertically in the inner box 6, so that water generated at the time of defrost flows down to the drain receiver 10, and the drain receiver There is no danger of dropping and scattering. Reference numeral 11 denotes a discharge pipe for discharging the drain to the outside of the storage, and 12 denotes a partition plate. Next, 13 denotes an evaporating dish for evaporating defrost water, 14 denotes a heating pipe for heating the evaporating dish, 15 denotes a compressor, and 16 denotes a machine room. The frosting / defrosting evaporator 9 is provided in the machine room 16.
It is provided on the upper part, so that the piping length can be shortened,
Thereby, the volume of the inner box 6 is not reduced.

The temperature of the frosting / defrosting evaporator 9 is as follows:
The temperature is set lower than the cooling pipe 7. Further, the discharge pipe 11 has a U trap shape, and a part of the defrost water is retained to shut off the inside of the inner box 6 from the outside air.

Next, FIG. 3 shows the piping of the freezer. In FIG. 3, the refrigerant delivered from the compressor 15 is:
A heating pipe 14 for heating the evaporating dish 13, a radiating pipe 5,
The desiccant is filled and the divide device 17, the first decompression device 18, the cooling pipe 7, which is an evaporator, the second decompression device 19,
Defrosting / defrosting evaporator 9 and accumulator 2 for preventing liquid return
0, and returns to the compressor 15.

A solenoid valve 22 is provided on a pipe 21 connecting the heating pipe 14 and the frosting / defrosting evaporator 9, and a check valve is provided on a pipe 23 between the cooling pipe 7 and the second pressure reducing device 19. 24 are provided to regulate the flow of the refrigerant during defrosting.

FIG. 4 shows a control circuit of the freezer. In FIG. 4, the motor 25 of the compressor 15 is adjusted by a temperature controller 26 so as not to affect the temperature in the inner box 6 of the freezer. It has become. 27 is a defrost timer,
The timer switch 29 is turned on at regular intervals by the operation of the motor 28.

A solenoid valve 30 and a defrost release thermostat 31 are connected to the ON side of the timer switch 29.
The temperature sensing portion of the defrost release thermo 31 is the frosting / defrosting evaporator 9
Timer switch 2
9 is turned off to end the defrosting. 33,
Reference numeral 34 denotes a delay timer, which is connected so as not to energize the motor 25 of the compressor for a predetermined time every time the timer switch 29 is actuated, thereby protecting the compressor 15.

Next, the operation of the above structure will be described. When the freezer is energized, the compressor motor 25 rotates and starts operating. The refrigerant is sent out from the compressor 15, and as shown by the solid line in FIG.
4, heat radiation pipe 5, dehydrator 17, first pressure reducing device 18, cooling pipe 7 as an evaporator, second pressure reducing device 19,
Accumulation to prevent frost formation and defrost evaporator 9 and liquid return
And sequentially returns to the compressor 15.

The cooling pipe 7 cools the inner box 6 of the freezer by evaporating the refrigerant, and cools the inside of the inner box 6. Second
The refrigerant that has reached the frosting / defrosting evaporator 9 via the pressure reducing device 19 is kept at a lower temperature than the cooling pipe 7, passes through the accumulator 20, and returns to the compressor 15 again. Come.

When the inside of the inner box 6 is cooled in this way,
Moisture in the outside air that enters when the lid 3 is opened or closed, or evaporated water from frozen foods and the like stored in the inner box 6 freezes and tends to adhere to the inner wall as frost. Since the temperature of the evaporator 9 is lower than that of the cooling pipe 7, a difference in vapor pressure is generated, and frost is concentrated on the frosting / defrosting evaporator 9, and the frost can be prevented from adhering to the inner wall of the inner box 6.

On the other hand, when a predetermined time elapses after the timer motor 28 of the defrost timer 27 operates at the same time as the energization, the timer switch 29 is turned on, the solenoid valve 30 is opened, and frost formation from the compressor 15 starts. -The high-temperature refrigerant flowing through the defrost evaporator 9 is prevented from flowing into the cooling pipe 7 by the check valve 24, and the temperature inside the inner box 6 is prevented from rising. When the high-temperature refrigerant flows through the frost / defrost evaporator 9, the frost attached to the frost / defrost evaporator 9 is melted and removed. The removed frost becomes water and is stored in the evaporating dish 13 from the drain receiver 10 through the discharge pipe 11.

The drain stored in the evaporating dish 13 is heated by the heating pipe 14 and evaporates to the atmosphere. At this time, the drain receiver 10 and the discharge pipe 11 are each heated by a heater (not shown), and even after the defrosting is completed, the heat generated by the compressor 15 does not freeze the drain and make it impossible to discharge. .

When the defrosting is completed, the defrost release thermostat 31
Operates, the timer switch 29 is turned off, the electromagnetic valve 30 is closed, the supply of the high-temperature refrigerant to the frosting / defrosting evaporator 9 is stopped, and the state returns to the energized state.

Here, the operation of the compressor 15 by the temperature controller 26 and the timer switch 29 will be described. Temperature controller 2
6 controls the operation of the compressor 15 by detecting the temperature in the inner box 6, and the timer switch 29 controls the operation of the compressor 15 at predetermined time intervals.

For this reason, for example, when the timer switch 29 is operated in a time immediately after the temperature controller 26 is turned off,
The pressure difference between the discharge side and the suction side of the compressor 15 is large, a large torque is required, and the compressor motor 25 cannot be restarted.
Large current flows. (The same applies to the opposite case.) An overload relay (not shown) is attached to the normal compressor motor 25 to prevent a large current from flowing for a long time.
A large current flows until the compressor operates, which significantly impairs the durability reliability of the compressor 15.

Therefore, each time the timer switch 29 is actuated, the delay timers 34, 33 are actuated for a predetermined time (about 3 to 5 minutes).
A protection circuit for forcibly prohibiting conduction to the compressor 15 is configured to prevent a large current from flowing to the compressor motor 25 for a long time to protect the compressor motor 25.

Thereafter, the same operation is repeated every predetermined time of the defrost timer 27. In this way, frost is intensively attached to the frosting / defrosting evaporator 9, and further, this frost is periodically removed and evaporated and diffused into the atmosphere, so that the frost adheres to the inner surface 6 of the box in the freezer. Will not be.

In the above embodiment, the frosting / defrosting evaporator 9 may be formed by adding a fin or the like, or may be attached to an appropriate position in the inner box 6 to further improve the frosting effect.
The compressor 1 is used as a heat source for defrosting and evaporating defrost water.
A heater (not shown) other than the high-temperature refrigerant from No. 5 may be used.

[0034]

According to the present invention, the frosting / defrosting evaporator provided inside the inner box has a lower temperature than the cooling pipe provided outside, and the inner box Inside, a frost / defrost evaporator is provided at a position equal to or lower than the highest position of the cooling pipe, so that frost is concentrated on the frost / defrost evaporator. And since it is defrosted there, frost formation in the inner box can be reliably prevented. Therefore, the labor for defrosting as in the above-mentioned conventional apparatus can be omitted. Thereby, effective cooling can be performed, and the life can be improved.

[0035]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a direct cooling type chest freezer, showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a piping diagram of a direct cooling type chest freezer.

FIG. 4 is a wiring diagram of a direct cooling type chest freezer.

FIG. 5 is a perspective view of a conventional direct cooling type chest freezer.

FIG. 6 is a cross-sectional view of the direct-cooled chest freezer.

[Explanation of symbols]

 6 Inner box 7 Cooling pipe 9 Defrosting / defrosting evaporator 13 Evaporating dish 14 Heating pipe 15 Compressor 16 Machine room

Claims (6)

(57) [Claims] An inside of a freezer provided with a cooling pipe on the outside, inside the inner box of a freezer, at a position equivalent to or lower than an uppermost position of the cooling pipe, for performing frosting and defrosting.
A direct cooling type chest freezer provided with a defrost evaporator. 2. The direct cooling chest freezer according to claim 1, wherein the temperature of the frosting / defrosting evaporator is set lower than the temperature of the cooling pipe. 3. The direct cooling chest type according to claim 1, wherein the frosting / defrosting evaporator communicates with an evaporating dish for evaporating water generated by the defrosting outside the inner box. freezer. 4. The direct-cooled chest-type freezer according to claim 1, wherein the frosting / defrosting evaporator is provided so that the length direction is up and down. 5. The direct-cooled chest freezer according to claim 1, wherein the frosting / defrosting evaporator is arranged in an inner box at an upper part of a machine room accommodating the compressor. 6. The direct defrost / defrost evaporator according to claim 1, 2, 3, 4, or 5, further comprising a control circuit for stopping the compressor for a predetermined period of time in connection with its operation. Cold chest freezer.