JPH0328301Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a refrigerated case, and more particularly, to a refrigerated case that is improved to prevent frost from forming on the inner wall of a refrigerator for storing frozen foods, etc. .

[Technical background of the invention and its problems] There is a freezer case shown in FIG. 13 for keeping and displaying frozen foods and the like. Figure 13 shows
FIG. 2 is a perspective view showing the appearance of a freezing case. Doors 3 and 4 are provided at the top of the freezer case for taking frozen foods and the like into and out of the refrigerator. The doors 3 and 4 have a mechanism that opens and closes them by sliding them left and right.

By the way, in this type of freezer case, when putting in and taking out frozen foods, outside air enters the cold storage 1 that stores frozen foods, etc., and as shown in FIG. 14, the inner wall surface 1b of the cold storage 1. A large amount of frost a adheres to the surface.

This large amount of frost impedes the cooling effect, worsens the display effect of stored items, and causes the inconvenience of narrowing the storage space.

For this reason, in the past, this frost was removed by periodically scraping it off with a spatula or hitting it with a bottle or the like. However, this method requires time and effort to maintain and manage, and also damages the inner wall surface of the cold storage, damaging its appearance, and sometimes even damaging the refrigerant pipes, causing gas leaks. Furthermore, during defrosting, frost was scattered on the stored items, further worsening the display effect.

Another method is to use a heater. This is intended to prevent the above-mentioned frost a from developing and reaching the doors 3 and 4 and interfering with their opening and closing. However, this method is uneconomical and undesirable because the heater consumes power.

[Purpose of the invention] The present invention was made in consideration of the above circumstances, and its purpose is to provide a refrigerated case that can effectively prevent frost from forming on the inner wall surface of a cold storage for displaying and storing frozen foods, etc. is to provide.

[Summary of the invention] In order to achieve the above-mentioned purpose, the present invention has been developed in a refrigerated case for storing and displaying frozen foods, etc., in which the inside of the opening of the refrigerated box, which stores the frozen foods, etc. and has an opening that opens upward, is provided. An evaporator for frosting is provided along the circumference. This evaporator is connected via a switching means to a refrigeration cycle provided for cooling the above-mentioned cold storage. Further, this switching means is configured to switch between the high temperature refrigerant and the low temperature refrigerant in the refrigeration cycle by switching the flow path and guide the refrigerant to the frosting evaporator.

On the other hand, a drainage channel is provided below the evaporator to receive the defrosting water dripping from the evaporator and drain it to the outside. With this configuration, a low-temperature refrigerant is passed through the frosting evaporator to form frost thereon, and during defrosting, a high-temperature refrigerant is passed through the evaporator to thaw the frost.
Thawed defrost water is drained outside through a drainage channel.

[Embodiments of the invention] Hereinafter, preferred embodiments of the invention will be described based on the accompanying drawings.

FIG. 2 is a side sectional view of the refrigerating case, and FIG. 3 is an enlarged view of portion A in FIG. 2.

As is clear from FIG. 2, this refrigerator case includes a cold storage 1 having an upwardly opened opening 1a, a compressor (not shown) constituting a refrigeration cycle for cooling the inside of this cold storage 1, Condenser 2
It mainly consists of

Further, in the opening 1a of the cold storage 1, there are third and third sliding doors 3 and 4 that cover the opening 1a of the cold storage 1.
As is clear from the figure, it is provided so as to slide on a front rail 5 and a rear rail 6 using pulleys 7 and 8. The opening/closing doors 3 and 4 are made of transparent glass to enhance the visibility of the items stored in the cold storage 1.

On the other hand, the cold storage 1 also serves as a cooler, and is formed by filling a space between an inner box 9 and an outer box 10 that are open upwards with a heat insulating material 11, and covering the upper ends thereof with an insulating frame 12. . Further, an evaporator 26 for cooling the inside of the cold storage box 1 is provided on the outer peripheral surface of the inner box 9.

The insulating frame 12 is formed in a stepwise manner over the entire circumference, and the frosting evaporator 1 is formed along the standing portion 12a.
3 are elastically fitted at appropriate intervals and attached using fixtures 14 made of an elastic material, as shown in FIG. The evaporator 13 is made of extruded aluminum with a fin attached to one end of the refrigerant pipe. Further, in the insulating frame 12 below the frosting evaporator 13, a drain channel 15 is formed with a concave cross section to receive the defrosting water dripping from the evaporator 13 and to drain it to the outside. Further, a defrosting heater 16 for preventing freezing is provided directly below the drainage channel 15. Further, as shown in FIG. 1, the drainage channel 15 is inclined so that the drainage ports 15a provided at each corner (four locations) are the lowest. In this embodiment, the frosting evaporator 13 is installed horizontally, but it may be installed parallel to the drain channel 15 that is inclined.

On the other hand, a frosting evaporator 1 is provided at the upper end of the insulating frame 12.
3 to protect it from being easily touched by hands, etc., and the rails 5 and 6 are placed on the top surface of the rails 5 and 6.
A cover plate 17 is provided extending to the inside of the refrigerator.

By the way, in addition to the above-mentioned configuration, this embodiment is characterized by an automatic door closing device, which will also be mentioned.

This device is for preventing people from forgetting to close the door, and has a structure shown in FIGS. 4 and 5.

FIG. 4 is an enlarged view of part B in FIG. 2, and FIG. 5 is a sectional view of the door handle and the cold storage.

In FIG. 4, 18 is a motor, and its output drives rubber rollers 19 and 20 that move the doors 3 and 4. on the other hand,
In FIG. 5, a ferrite sensor 21 is provided on the handle 3a of the door 3, and an inner box 9 is provided.
A ferrite switch 22 is attached to the outside surface of the refrigerator.

Next, FIG. 6 shows an electric circuit of the automatic door closing device constructed as described above. In the figure, 23 is a relay, and a ferrite switch 22 is connected in series to this relay 23 to open and close its contacts. On the other hand, on the contact side, the first motor 1
8, and a switch 2 that operates by changing capacitance.
4 are connected to each other.

Now, to explain the operation of the automatic door closing device configured as above, when the doors 3 and 4 set on the front rail 5 and the rear rail 6 are opened, the handle part 3
The ferrite sensor 21 and the ferrite switch 22 are separated, the relay 23 shown in FIG. As a result, the motor 18 does not rotate. Next, when you release your hand from the handle 3a, the capacitance changes, the switch 24 is connected, and the motor 18
Rubber rollers 19 and 20 driven by rotate and close the doors 3 and 4. In the closed state, the ferrite switch 22 is activated to turn on the relay 23 and the motor 18 is stopped.

Therefore, this device can prevent the temperature inside the refrigerator from rising due to forgetting to close the door, lower the operating rate, and contribute to energy saving. In addition, there is no need to tilt the door rail, giving it a good appearance, and since a switch that changes capacitance is used, it is also possible to stop the door midway.

Note that it is also possible to use a photo sensor or the like instead of a switch activated by a change in capacitance.

Next, the refrigeration cycle of the refrigerating case of this embodiment will be explained based on FIG. 7. In the figure,
25 is a compressor, to which a condenser 2, a frosting evaporator 13, and an evaporator 26 for cooling the inside of the cold storage 1 are connected in order through refrigerant piping from the discharge side. A capillary tube 27 and a two-way solenoid valve 28 which is a switching means are connected in parallel between the frosting evaporator 13, and a two-way solenoid valve 28 which is a switching means is connected between the frosting evaporator 13 and the evaporator 26. A solenoid valve 29 and a capillary tube 30 are connected in parallel as shown in the figure. Next, an electric circuit for controlling this refrigeration cycle will be explained based on FIG. 8. In the figure, 31 is a control switch, which is connected in series to a power source 32 such as the compressor motor 25a. Further, a defrosting timer switch 33 is connected in parallel with the compressor motor 25a. A two-way solenoid valve 29 is connected to a contact 33a of the timer switch 33, and a two-way solenoid valve 28 is connected to a contact 33b of the timer switch 33 via a defrosting return thermostat 34 to the control switch 31. In addition, the defrosting heater 3 is connected in parallel with the two-way solenoid valve 28.
5 is provided.

Next, the operation of this embodiment according to the above configuration will be explained.

Compressor 25 is controlled by control switch 31. If a condenser blower is provided, it should be turned on at the same time as the compressor 25 during cooling operation.
OFF, and then when the two-way solenoid valve 28 is turned ON during defrosting.
The relay 40 is turned off as shown in Figure 11.
Wire using. In the figure, 2a is a fan motor.

In the defrosting operation, the defrosting timer switch 33 closes the contact 33b at predetermined intervals, and the two-way solenoid valve 2
8 and the two-way solenoid valve 29, and the refrigerant is caused to flow as shown by the broken line arrow in FIG.

Next, the temperature of the frosting evaporator 13 rises, and the contact point of the defrosting return thermostat 34 installed in contact with the outlet pipe of the frosting evaporator 13 opens, and the two-way solenoid valve 28 becomes de-energized. , two-way solenoid valve 29
is energized, the cooling circuit is closed, and the defrosting operation is switched to the cooling operation. By the way, the frost adhering to the entire surface of the frosting evaporator 13 melts and is heated by the defrosting heater 16 through the drain channel 15 and drained out of the refrigerator from the drain port 15a without freezing. . The drain water led outside the refrigerator is collected in a drain pan (not shown) and is automatically evaporated by hot air from a condenser blower (not shown) or by a drain evaporation heater (not shown) installed at the bottom of the drain pan. .

Note that the cooling operation usually takes 3 to 5 hours, and the evaporator 26
At the same time, the inside of the refrigerator is cooled by the frosting evaporator 13, and at the same time, frost adheres to the frosting evaporator 13, and the defrosting takes place at 3.
It will thaw the frost in ~5 minutes and automatically enter cooling operation.

As described above, according to this embodiment, it is sufficient to simply provide the inexpensive frosting evaporator 13, and its mounting structure can be implemented easily and simply.

Note that the defrosting method of this embodiment is a periodic defrosting method using a defrost timer switch, and a method in which defrosting is reset using a return thermostat and cooling operation is started; however, the present invention is limited to this embodiment. Rather than using a defrost timer switch for regular defrosting and regular return, or by installing a frost sensor near the frosting evaporator,
Various modifications are possible, such as a method in which defrosting is started when a certain amount is reached.

Next, a modification of this embodiment will be explained.

FIG. 9 shows a modification of the refrigeration cycle.

The discharge side of the compressor 25 is branched into two directions; one side is connected to the frosting evaporator 13 via the condenser 2 and a capillary tube 41, and the other side is connected to the frosting evaporator 13 via a two-way solenoid valve 42, which is a switching means. and is directly connected to the frosting evaporator 13. In addition, the frosting evaporator 13
The outlet side is also branched into two directions via a three-way solenoid valve 43 which is a switching means, one side is directly connected to the absorption side of the compressor 25, and the other side is connected to the evaporator 26 for internal cooling.
It is also connected to the absorption side of the compressor 25 via. Next, the electric circuit for controlling this refrigeration cycle is constructed as shown in FIG. The difference from the circuit in FIG. 8 is that the two-way solenoid valve 42 and the three-way solenoid valve 4
3 are both connected to the contact 33b of the defrosting timer switch 33.

Therefore, the defrosting operation is performed using the defrosting timer switch 3.
3, the contact 33b is closed at predetermined time intervals, and the electromagnetic valves 42 and 43 are operated to flow the refrigerant as shown by the broken line arrows in FIG.

If there is a blower for the compressor, a relay 40 is used so that it is turned on and off at the same time as the compressor 25 during cooling operation, and also turned off when the two-way solenoid valve 42 is turned on during defrosting, as shown in Fig. 12. Wire as shown.
In the figure, 2a is a fan motor.

[Effects of the invention] As described above, the invention includes a frosting evaporator for forming frost on the inner periphery of the opening of the cold storage box and a system for draining the defrosting water dripping from this evaporator to the outside. Since the drain drainage channel and the heating means for preventing the drain water in the drain drainage channel from freezing are provided, the following excellent effects are exhibited.

(1) Frost formation on the inner wall of the cold storage box is greatly reduced.
Therefore, this eliminates the need for defrosting and greatly reduces maintenance and management labor.

Damage to the cold storage box during conventional defrosting is eliminated, extending the life of the set.

In addition to making effective use of space inside the refrigerator, frozen foods, etc. to be kept cool and displayed can be stored in the best condition, greatly improving the display effect.

The cooling efficiency of items stored in the refrigerator is improved, and power consumption can be reduced.

(2) There is no need for a frost prevention heater to prevent frost from growing above the refrigerator, contributing to energy savings.

[Brief explanation of drawings]

Fig. 1 is a perspective view of main parts showing an embodiment of the refrigerating case according to the present invention, Fig. 2 is a side sectional view of the refrigerating case according to the present embodiment, and Fig. 3 is A of Fig. 2.
FIG. 4 is an enlarged view of part B in FIG. 2, FIG. 5 is a cross-sectional view of the door handle and cold storage in the refrigerating case of this embodiment, and FIG.
The figure is an electric circuit diagram of the automatic door closing device adopted in this embodiment, Figure 7 is a refrigeration cycle diagram of the refrigerating case according to this embodiment, Figure 8 is a control circuit diagram of the refrigeration cycle of Figure 7, and Figure 9 10 is a control circuit diagram of the refrigeration cycle of FIG. 9, FIGS. 11 and 12 are control circuit diagrams of a refrigeration cycle with a condenser blower, and FIG. 13 is a diagram showing a modification of the refrigeration cycle. FIG. 14, which is an external view of a conventional freezing case, is a sectional view of a main part of the conventional freezing case showing a frosted state. In the figure, 1 is a cold storage, 12 is an insulating frame, 13 is a frosting evaporator, 15 is a drain channel, 15a is a drain port, 16 is a defrosting heater, and 25 is a compressor.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a refrigerating case that has a cold storage with an opening that opens upward, and a compressor, condenser, etc. that constitutes a refrigeration cycle for cooling the inside of the cold storage. , a frosting evaporator is connected to the refrigeration cycle through a switching means that switches between high-temperature refrigerant and low-temperature refrigerant in the refrigeration cycle, and the evaporator is provided along the inner periphery of the opening. Additionally, a refrigeration case is provided below the evaporator to receive the defrosting water dripping from the evaporator when the high-temperature refrigerant passes therethrough and to drain the water to the outside. (2) The refrigerating case according to claim 1, wherein the drainage channel has heating means for heating defrosting water dripped therein.