JPS5922459Y2 - Cold air circulation type freezer/refrigeration showcase - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cold air circulation type refrigeration showcase, and more particularly to a structure of a cold air ventilation path that uniformly and efficiently defrosts an evaporator.

Conventionally, as shown in FIG. 4, a cold air circulation type freezer/refrigeration showcase has an evaporator 6' for heat exchange disposed in a cold air ventilation path 3', and the cooled air that has been cooled by passing through the evaporator 6'. The inside of the refrigerator was cooled by circulating the air, but the gap 11' formed between both sides of the evaporator 6' and the cold air passage side wall 3'a
Since the cold air outlet side of the evaporator 6' is closed by the partition plate 12', the cold air cannot pass through the gap 11' and remains in a stagnant state. Excessive frost had formed in the U-ben 1 part 6b', and since the air heated by the defrost heater 4' did not pass through the U-ben 1 part 6b' even during defrosting operation, the U-ben 1 part could not be completely defrosted. Defrosting of the fin portion 6a' is performed using the fin portion 6a.
The defrost of the fin portion 6a' is short because the center part of the defrost is fast and the end parts of the defrost part are slow.

Therefore, in order to improve ventilation of the heated air in the gap 11' formed by both sides of the evaporator 6' and the cold air ventilation path side wall 3a', a ventilation hole 12a' is bored in the cold air outlet side partition plate 12'. At the same time, by configuring the defrosting heater 4' to extend to the cavity 11' (see Fig. 5), the defrosting effect of the U-ben 1 section 4b' of the evaporator 6' during defrosting operation can be improved. However, during cooling operation, the evaporator 6'
The cold air that has passed through the fin portion 5a' and the cold air that has passed through the gap 11' are mixed on the cold air outlet side, resulting in a decrease in cooling capacity.

Now, a part of the cold air outlet side of the fin portion 6a' of the evaporator 6' and a partition plate 12' that closes the gap 11' and the evaporator 6
By forming a return ventilation path 14' with a partition plate 13' formed to surround the U-ben 1 part 6b' (see Fig. 6), the defrosting effect of the U-ben 1 part 6b' can be improved. However, a dead space 11a' is formed between the return ventilation passage side wall 13a' and the cold air ventilation passage side wall 3a', and the side of the evaporator 6' and the cold air ventilation passage side wall 3a' are
Since the width of the gap formed by ' becomes larger, the amount of cool air vented in the section A at both ends of the cold air ventilation path decreases, and the amount of cold air blown out from the outlet (not shown) also decreases at both ends of the outlet. It had the defect that the temperature at both ends of the refrigerator was slow and the quality was high.

Furthermore, during the defrosting operation, the air heated by the defrosting heater 4' circulates through the return ventilation path 14' after the end of the fin portion 6a' of the evaporator 6' is finished defrosting, and once Since the heat was exchanged by passing through the fin portion 5a' of the evaporator 6', the defrosting ability of the U vent 1 section 6b' was reduced.

Therefore, in order to completely defrost the ice that has formed on the U-ben 1 section 6b', a long defrosting operation is required.

In order to eliminate the above-mentioned defects, the present invention provides a first partition plate that closes the cold air outlet side of the gap formed between the side wall of the evaporator and the side wall of the cold air ventilation passage, and By arranging a second partition plate equipped with an air blower in the passage and the gap to form a return ventilation path, and by arranging a defrosting heater on the cold air inflow side of the second partition plate, the evaporator The purpose of this project is to improve the defrosting ability of the first part of the U vent and shorten the evaporator defrosting time.

The present invention will be described above with reference to the drawings showing embodiments.

Reference numeral 1 denotes a heat insulating box body with a large opening on the top surface, and a cold air ventilation path 3 is formed along its inner wall between it and the inner box 2, extending from the front side (fabric in the figure) through the bottom to the back side. 3, a defrosting heater 4, a ventilation circulation path blower 5, and a cooling evaporator 6 are arranged in this order along the cold air circulation direction, and an air outlet 8 is formed by a rectifying guide plate 7 formed at the upper part of the back side. A cold air curtain 10 is formed between the inner box 2 and the inlet 9 formed at the upper part of the front side, and by covering the opening, frozen and refrigerated foods can be displayed in a cooled state in the inner box 2. There is.

In addition, in the bottom cold air ventilation passage 3, there is an evaporator 6 consisting of a fin portion 6a through which the air blown from the blower 5 exchanges heat, and a U-bent 1 portion 6b of a refrigerant tube protruding outward from the fin portion 6a. A gap 11 is formed between both sides of the evaporator 6 and the cold air ventilation path side wall 3a.
A first partition plate 12 is provided to block the cold air outlet side of the evaporator 6, and a second partition plate 13 having a substantially U-shaped cross section and equipped with the blower 5 is provided as a cold air ventilation path on the cold air inflow side of the evaporator 6. 3 and disposed within the cavity 11 to form a return ventilation path 14.

A defrosting heater 4 is disposed on the cold air inflow side of the blower 5 attached to the second partition plate 13 so as to face the second partition plate 13.

Note that, as shown in FIG. 3, the second partition plate 13 having a return ventilation hole 13a may be disposed within the cavity 11 to form the return ventilation path 14.

The present invention configured as described above, during cooling operation,
The evaporator 6 and the blower 5 are operated to circulate cold air through the cold air ventilation path 3, and a cold air curtain 10 is formed in the opening to cool the interior of the refrigerator, thereby maintaining the interior at a set temperature. During defrosting operation, the defrosting heater 4 and the blower 5 are operated to circulate the air superheated by the defrosting heater 4 through the cold air ventilation path 3, and to circulate the air superheated by the defrosting heater 4 through the fin section 6a of the evaporator 6 and the U-ben 1 section 6b. Defrost.

In addition, at the initial stage of defrosting operation, the air heated by the defrosting heater 4 is blown by the blower 5 to the cold air introduction side of the fin portion 6a of the evaporator 6, but between the fins of the evaporator 6, Because the ventilation resistance due to frosted ice is large, the evaporator 6
The heated air passing through the fin portion 6a is small, and the heated air is circulated through the return ventilation circulation circuit from the blower 5 to the U-bend portion 6b to the return ventilation passage 14 to the defrosting heater 4 to the cold air inflow side of the blower 5. It mainly defrosts the U-ben 1 section 6b.

Furthermore, since the fin portion 6a of the evaporator 6 is defrosted from the beginning, the ice that has formed between the fins will gradually melt.
The ventilation resistance gradually decreases, and around this time U-Ben 1
Defrosting of the section 6b is completed, and the volume of the heated air circulating in the return ventilation circulation circuit gradually decreases, and the volume of the heated air passing through the fin section 6a gradually increases, mainly in the fin section. 6a defrosting will now be performed.

Therefore, by the time the defrosting of the fin portion 6a of the evaporator 6 is completed, the U-ben 1 portion 6b is in a drained state.

As described above, the present invention includes a first partition plate that closes the gap formed by the side wall of the evaporator and the side wall of the cold air ventilation passage on the cold air outlet side, and a cross-sectional diagram showing the structure in which the cold air ventilation passage and the blower are installed in the cavity. A U-shaped second partition plate is provided to form a return ventilation path, and a defrosting section is provided on the cold air inflow side of the blower attached to the second partition plate so as to face the second partition plate. By configuring the configuration with a heater, the initial stage of defrosting operation mainly defrosts one part of the U vent of the evaporator, and then defrosts the fin part of the evaporator. Melting of the ice that has formed on the first part of the vent prevents it from being left behind, and has the effect of shortening the defrosting time of the entire evaporator.

In addition, in the configuration that has a conventional return ventilation path (see Figure 6), a part of the cold air outlet side of the evaporator is blocked and returned to the U-bend section, so the cooling During operation, the cool air that has exchanged heat with the fins of the evaporator is returned to the blower through the U-bent part, so the cooling capacity of the evaporator cannot be used 100% for cooling the inside of the refrigerator. This has the effect that all the cold air that has been heat exchanged in the fins of the evaporator can be used to cool the inside of the refrigerator.

Furthermore, during defrosting operation, the air heated by the defrosting heater once passes through the fin section, which reduces the defrosting ability of the U vent 1 section.
In order to completely defrost the ice that has formed on the U vent, it was necessary to run the defrost operation for a long time.In contrast, with this invention, the air heated by the defrost heater is blown directly to the U vent. Therefore, the entire defrosting capacity of the heated air can be used to defrost one part of the U-ben, and the defrosting time can be shortened.

Therefore, it is possible to prevent the temperature of the products displayed in the warehouse from becoming too high.

[Brief explanation of the drawing]

Fig. 1 is a schematic sectional view of a cold air circulation type freezer/refrigeration showcase of the present invention, Fig. 2 is a cross-sectional plan view of the main part showing an embodiment of the invention, and Fig. 3 is a diagram showing another embodiment of the invention. FIGS. 4 to 6 are cross-sectional plan views of main parts showing conventional embodiments. 3...Cold air ventilation path, 3a...Cold air ventilation path side wall, 5...Blower, 6...Evaporator, 11...Gap part, 12...first partition plate, 13...second partition plate, 13 a...
... Return ventilation hole, 14 ... Return ventilation path, 15
...wind tunnel.

Claims (1)

[Scope of utility model registration request] In a cold air circulation type freezer/refrigeration showcase in which an evaporator is disposed in a cold air ventilation path, and the interior of the refrigerator is cooled by circulating air that has passed through the evaporator and exchanged heat,
A gap is formed between a side wall of the evaporator and a side wall of the cold air ventilation path, a first partition plate is disposed on the cold air outlet side of the gap, and a blower is installed in the cold air ventilation path and the gap. A return ventilation path is formed by disposing a second partition plate with
A cold air circulation type freezer/refrigeration showcase characterized in that a heating device is disposed on the cold air inflow side of the partition plate.