KR940009565B1 - Open showcase - Google Patents

Abstract

The apparatus and method prevents the temp of the showcase interior from abruptly going up, and maximizes the efficiency of the air film in an front openning of the open showcase. The air circulation apparatus comprises a defrosting air circulation device (10)/a cooling air circulation device (20) installed in an air circulation duct (40); an air inlet (17) inducing the air circulating through the duct (40); a 1st blowing fan (11) blowing the air passed through the air inlet (17); an evaporator (13) attaching a defrosting heater (12); a plate (16) changing the flow direction of the air pased through the evaporator (13); a solenoid valve (15) controlling the position of the plate (16); a 2nd blowing fan (21) blowing the air circulated in the duct (40); an air outlet (22) feeding the air blown from the blower fan (21) toward an air outlet (22); a 2nd solenoid valve (23) controlling the position of a plate (24).

Description

Dual air circulation method and dual air purifying device of flat open showcase

1 is a side cross-sectional view showing an air circulation device of a conventional flat open showcase.

Figure 2 is a side cross-sectional view showing a double air circulation device of the planar open showcase according to the present invention showing the circulation of air during defrosting operation.

3 is a perspective view of a double air circulation device according to the present invention.

Figure 4 is a side cross-sectional view showing a double air circulation device of the planar open showcase according to the present invention showing the circulation of air during the cooling operation.

5 is a defrost circuit diagram of a double air circulation device according to the present invention.

* Explanation of symbols for main parts of the drawings

10: defrost air circulation section 11, 21: blowing fan

12: defrost heater 13: evaporator

14: defrost air passage 15, 23: solenoid valve

16: air circulation passage conversion plate 17: air inlet

20: cooling air circulation 24: air inlet blocking plate

The present invention relates to a dual air circulation method of a flat open showcase, and more particularly, to a double air circulation method of a flat open showcase to prevent the sudden rise of the internal temperature of the showcase during defrosting operation and to maximize the efficiency of the air film in the front opening of the open showcase. will be.

The present invention also relates to a double air circulation device operating according to the double air circulation method of the present invention.

The open showcase which is a technical field to which the present invention is applied is a storage that is installed in a supermarket or a department store to keep the internal temperature at a low temperature by circulating air of laminar flow.

If the cooling operation of the open showcase is continued, freezing occurs on the surface of the evaporator, which is a cooling device of the open showcase, thereby reducing the cooling performance of the evaporator. At this time, by operating the hot defrost heater attached to the evaporator to remove the frost generated on the surface of the evaporator.

A planar open showcase with a conventional air circulation structure is shown in FIG. In the open show case, an air circulation passage 2 is formed in the main body 1. In the air circulation passage 2, a blowing fan 3 and an evaporator 5 having a defrost heater 4 are provided. An air suction plate 6 is provided at one end of the air circulation passage 2, and a honeycomb 7 is attached to the other end of the air circulation passage 2.

During the cooling operation, the cooling air repeatedly circulates through the air circulation passage 2 formed in the open showcase body 1 to maintain the internal temperature of the showcase at a low temperature. The air introduced through the air suction plate 6 is blown by the blowing fan 3 and then cooled while passing through the evaporator 5. The cooled air is blown through the honeycomb 7 attached to one end of the air circulation passage 2 to change into laminar air. The laminar air is discharged toward the air suction plate 6 to form an air film. The air introduced again through the air suction plate 6 is blown by the blowing fan 3 and then repeats the cooling air circulation process as described above. The frost is generated on the surface of the evaporator 5 through an iterative circulation process. The defrosting operation is performed by the defrost timer (not shown) after a certain time.

When the defrosting operation is carried out, the compressor (not shown) is stopped to stop the cooling operation in the evaporator 5 and the defrost heater 4 attached to the evaporator 5 starts to generate heat. The air blown by the blower fan 3 turns into hot air while passing through the defrost heater 4 and then melts the frost generated on the surface of the evaporator while passing through the evaporator 5. Then, this air flows along the air circulation passage 2 and is blown out through the honeycomb 7 and then introduced into the air circulation passage 2 through the air suction plate 6 and blown by the blowing fan 3. Thus, the defrost air circulation process as described above is repeated. When the defrost time set in the defrost timer ends, heat generation of the defrost heater 4 is stopped and the evaporator 5 is operated again by the operation of the compressor to repeat the cooling air circulation process as described above.

However, when the air circulation method of the conventional flat open showcase is adopted, the air circulation of the hot air at the time of the defrosting operation is made the same as the cooling air circulation process at the time of the normal cooling operation, thereby generating heat of the defrost heater 4. Due to the defrost air changed into hot air through the evaporator (5) and through the air circulation passage (2) to the inside of the showcase, the temperature inside the showcase rises rapidly, causing serious damage to the stored goods and during the defrost operation As the internal temperature of the showcase is increased, there is a problem in that the descent time to the normal temperature becomes longer after the normal cooling operation is started.

An object of the present invention is to provide a double air circulation method for preventing the sudden rise of the internal temperature of the showcase during defrosting and shortening the fall time to the normal cooling temperature immediately after defrosting.

In order to achieve this purpose, the air circulation passage of the flat open showcase is circulated to blow air introduced into the air inlet to the first blower fan, and the air blown by the first blower fan is cooled by an evaporator to cool the air. The evaporator in which the defrost heater is operating by closing the air inlet with the air inlet blocker by operating the second air blowing fan and operating the second solenoid valve to blow the air circulating through the circulation passage and the air circulating through the air circulation passage to the second blowing fan. To prevent the air flow to the side, move the air circulation path conversion plate connected to the first solenoid valve to direct the air passing through the evaporator to the first blowing fan, and the defrost air passing through the defrost heater is repeated. The air blown by the second blowing fan causes the air circulation passage formed by the air circulation passage conversion plate to be circulated. Provided is a double air circulation method of a planar open showcase consisting of a defrost air circulation step circulating through.

In addition, an object of the present invention is to provide a double air circulation device that prevents a sudden increase in the internal temperature of the showcase during defrosting and shortens the descent time to the normal cooling temperature immediately after defrosting.

In order to achieve this purpose, the defrost air circulation section and the cooling air circulation section is installed in the air circulation passage of the flat open showcase, the defrost air circulation section air inlet and air inlet through which the air circulating through the air circulation passage A first blowing fan for blowing the circulating air introduced through the air, an air circulation path conversion plate for changing the flow direction of the circulating air passing through the evaporator with the defrost heater by the first blowing fan, and an air circulation path conversion plate And a defrost air passage formed between the evaporator and the first solenoid valve to re-introduce the circulating air passing through the evaporator to the first blower fan, and the cooling air circulating unit includes the defrost air. Installed in front of the circulation portion, the second blowing fan for blowing air circulating through the air circulation passage, and air from the blower fan The air outlet and the air inlet block which is installed on the air outlet plate and a double air circulation of the second flat type open showcase comprising a solenoid valve for adjusting the position of the air inlet device the blocking plate toward the export ring passage is provided.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments illustrated in the accompanying drawings.

Figure 2 shows a planar open showcase with a double air circulation device according to the present invention. The double air circulation device according to the present invention includes a defrost air circulation part 10 and a cooling air circulation part 20. The double air circulation device is provided in the air circulation passage 40 formed in the showcase body 30. The air circulation passage 40 is defined by the showcase body 30 and the display shelf 41 and the air guide plate 42 installed inside the showcase. An air suction plate 43 is attached to one end of the air circulation passage 40, and a honeycomb 44 is provided at the other end of the air circulation passage 40. The evaporator 13 to which the first blowing fan 11 and the defrost heater 12 are attached is located in the defrost air circulation section 10. The second blower fan 21 is located in the cooling air circulation unit 20. The defrost air passage 14 is formed between the upper portion of the defrost air circulation part 10 and the evaporator 13. First solenoid valves 15 are provided at both ends of the upper stage of the defrost air circulation section 10, and the air circulation path conversion plate 16 is attached to the first solenoid valves 15. An air inlet 17 through which air is introduced is also formed in the defrost air circulation part 10. The cooling air circulation unit 20 is installed adjacent to the air inlet 17 of the defrost air circulation unit 10. An air outlet 22 through which the air blown by the second blowing fan 21 is discharged is formed in the cooling air circulation part. A second solenoid valve 23 is installed at the bottom of the air outlet 22, and an air inlet blocking plate 24 for closing the air outlet 22 or the air inlet 17 is attached to the second solenoid valve 23. It is.

The air circulation process of the double air circulation system when the defrost operation is performed is also shown in FIG.

3 is a perspective view showing the external structure of the double air circulation system according to the present invention. First solenoid valves 15 are provided at both ends of the upper stage of the defrost air circulation section 10, and the air circulation path conversion plate 16 is attached to the first solenoid valves 15. A tension spring 18 is mounted between the first solenoid valve 15 and the air circulation path conversion plate 16, and a tension spring 25 is provided between the second solenoid valve 23 and the air inlet blocking plate 24. It is installed.

4 shows the air circulation process by the double air circulation system during the cooling operation. The circulating air is introduced through the air suction plate 43 and then passed through the air inlet 17 of the defrost air circulation unit 10 and blown by the first blowing fan 11, and then cooled while passing through the evaporator 13. It turns into air and circulates through the air circulation passage 40 to maintain the inside of the showcase at low temperature.

5 shows a defrost circuit diagram of a double air circulation device according to the present invention. The ON contact of the defrosting timer T1 and the defrosting relay R1 are connected in series, and the ON contact of the defrosting timer T1 and the second blowing fan M2 (21), the second solenoid valve SV2 (23), and the first solenoid valve SV1 ( 15) and the defrost heater H1 (12) are connected in series, and the compressor COMP is connected in series with the R1b contact of the defrost relay R1, that is, the normal OFF contact, and then the first blower fan M1 (11) is always connected. Configured to connect to the power source to operate.

The operation and effects of the double air circulation device of the present invention configured as described above will be described.

When power is applied to the planar open showcase, as shown in FIG. 4, the first blowing fan 11 is operated and the evaporator 13 performs the evaporation operation by the operation of the compressor (not shown). At this time, the blowing air generated by the first blowing fan 11 is converted into cooling air through the evaporator 13 and ascends through the air circulation passage 40 along the air guide plate 42 and passes through the honeycomb 44. It is changed from turbulent blowing air to laminar blowing air. The laminar blower air forms an air film at the front opening of the open showcase and flows into the air suction plate 43. This cooling air circulation is repeated while the cooling operation continues.

When the defrosting timer T1 reaches the defrosting time after the cooling operation is performed for a predetermined time, the operation of the compressor COMP is stopped, the operation of the evaporator 13 is stopped, and the second blowing fan M2 21 is operated. The solenoid valve SV2 (23) operates to move the air inlet blocking plate 24 in the X direction as shown in FIG. 3 to close the air inlet 17, and the first solenoid valve SV1 (15) operates. The air circulation path conversion plate 16 is moved in the P direction to block a part of the air circulation path 40 and the defrost heater H1 12 is heated (see FIGS. 2 and 5). At this time, the air circulation is blown by the first blower fan 11 as shown by the dotted arrow in FIG. 2, and the blower air is changed to hot hot air while passing through the defrost heater 12, and then passes through the evaporator 13. Done. The hot air air passing through the evaporator 13 removes the frost generated on the surface of the evaporator. The defrost air that has passed through the evaporator 13 is blocked by the air circulation path conversion plate 16 so that the defrost air cannot pass through the air circulation path 40 along the air guide plate 42, but the defrost air of the evaporator 13 and the defrost air circulation part 10. It is blown to the defrost air passage 14 formed between the upper surface and flows toward the first blowing fan (11). The defrost air flowing toward the first blower fan 11 is introduced into the first blower fan 11 by the air inlet blocking plate 24 and then blown by the first blower fan 11, and then the circulation process as described above. Will be repeated.

At this time, the cooling air stored inside the showcase is sucked into the air suction plate 43 by the rotation of the second blowing fan 21 and flowed into the air circulation passage 40 as shown by the solid arrows in FIG. Next, it passes along the air guide plate 42 through a space formed between the lower surface of the display shelf 41 and the upper surface of the defrost air circulation unit in which the first solenoid is installed through the air outlet 22. Cooling air having passed through the air circulation passage 40 along the air guide plate 42 is injected through the honeycomb 44 to change from turbulent air to laminar air. The laminar air is discharged toward the air suction plate 43 to form an air film. The air introduced again through the air suction plate 43 is blown by the second blowing fan 21 and then repeats the cooling air circulation process as described above.

When the defrosting operation is completed again and the normal cooling operation time is reached, the defrosting relay R1 is turned off by the defrosting timer T1 and the compressor COMP is operated to perform the evaporation of the evaporator 13. The second blowing fan M2 21 stops, and the second solenoid valve SV2 23 is returned by the tension spring 25 to move the air inlet blocking plate 24 in the Y direction as shown in FIG. The air inlet is opened, and the first solenoid valve SV1 (15) is returned by the tension spring 18 to move the air circulation path conversion plate 16 in the Q direction to open the air circulation path 40, and to open the defrost heater. The heat generation of H1 12 is stopped (see FIGS. 4 and 5). Air circulation at this time follows the circulation process shown in FIG.

According to the dual air circulation device of the present invention as described above, the hot defrost air and the low temperature cooling air is completely separated and blown to minimize the increase in the internal temperature of the showcase, does not cause any damage to the stored goods, open showcase Maximize the efficiency of the air film formed in the front opening of the. In addition, since the rise of the internal temperature of the showcase is minimized during the defrosting operation, when the cooling operation is restarted, the return time to the predetermined normal cooling temperature is achieved in a short time, thereby economical and improving the cooling performance of the showcase.

Claims (7)

The air circulation passage 40 of the flat open showcase is circulated to blow air introduced into the air inlet 17 into the first blowing fan 11, and the air blown by the first blowing fan 11 is evaporated. Cooling air circulation step to cool through the 13 and circulates through the air circulation passage 40, and blows air circulating through the air circulation passage 40 to the second blowing fan 21 and the second solenoid valve (23) to close the air inlet (17) with an air inlet blocking plate (24) to prevent defrost heater (12) from flowing toward the evaporator (13) in operation, and to open the first solenoid valve (15). The defrost heater 12 by moving the air circulation path conversion plate 16 connected to the first solenoid valve 15 to direct the air passing through the evaporator 13 toward the first blowing fan 11. The defrost air passed through the circulation is repeatedly circulated, and the second blowing fan 21 Air blown by the) is a double air circulation method of the planar open showcase, characterized in that consisting of a defrost air circulation step circulating through the air circulation passage 40 formed by the air circulation passage conversion plate (16). The method of claim 1, wherein the first blower fan (11) is operated and the second blower fan (21) is not operated during the cooling operation. The air blown by the second blower fan 21 according to claim 1 or 2 when the first blower fan 11 operates and the second blower fan 21 does not operate. Cooling through (13) is a dual air circulation method of the flat open showcase, characterized in that circulating through the air circulation passage (40). The dual air circulation method according to claim 1, wherein the first blowing fan (11) and the second blowing fan (21) operate simultaneously during the defrosting operation. The method of claim 1, wherein the defrost heater (12) is operated when the first blowing fan (11) and the second blowing fan (21) simultaneously operate. The air blown by the first blower fan 11 according to claim 1, wherein the air blown by the first blower fan 11 when the first blower fan 11 and the second blower fan 21 operate simultaneously. The air is circulated through the air circulation passage 40 without being introduced into the defrost air circulation part 10, and the air in the defrost air circulation part 10 is discharged by the first blower fan 11. 10) The dual air circulation method of the flat open showcase, characterized in that repeated circulation within. The defrost air circulation part 10 and the cooling air circulation part 20 installed in the air circulation passage 40 of the flat open showcase, the defrost air circulation part 10 is the air circulation passage 40 An air inlet 17 through which air circulating flows, a first blowing fan 11 for blowing circulation air introduced through the air inlet 17, and a defrost heater by the first blowing fan 11. 12 is a first air solenoid valve 15 for adjusting the position of the air circulation passage conversion plate 16 for changing the flow direction of the circulation air passing through the attached evaporator 13 and the air circulation passage conversion plate 16. ) And a defrost air passage 14 formed between the evaporator 13 and the first solenoid valve 15 to re-introduce circulating air passing through the evaporator 13 toward the first blower fan 11. ), The cooling air circulation unit 20 is installed in front of the defrost air circulation unit 10, A second blowing fan 21 for blowing air circulating in the air circulation passage 40, an air outlet 22 for discharging air from the second blowing fan 21 toward the air circulation passage 40; And a second solenoid valve 23 for adjusting the position of the air inlet blocking plate 24 installed at the air outlet 22 and the air inlet blocking plate 24. Dual air circulation system.