JPH0447589Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a show case having an evaporator that can be operated separately for cooling or defrosting.

(Prior art) Conventionally, in this type of show case, two air passages through which cooling air circulates are formed between the back insulation wall of the case body and the inner box, and two air passages are formed in the inner air passage. evaporators are installed in parallel through a partition. Further, each evaporator accommodates a pipe or coil for refrigerant distribution, and is configured so that each evaporator is alternately cooled or defrosted by a predetermined control device. Furthermore, dampers are installed above both evaporators to prevent the air near the evaporator during defrosting from mixing with the cooling air, and these dampers operate to close the air passage on the evaporator side that is being defrosted. It's becoming like that.

(Problems to be Solved by the Invention) However, if the air passage during defrosting is blocked by a damper, there is a drawback that the defrosting time becomes longer and the defrosting effect deteriorates. In addition, air with high water vapor partial pressure remains between the evaporator and damper during defrosting, so when the damper and evaporator are switched, this air flows into the inner air passage and blows the air blower. adheres to fans and ceilings. When this moisture is cooled, it freezes and causes a significant obstruction to the cooling air passage.

(Purpose of the invention) The present invention was made in view of the above circumstances, and its purpose is to provide a case that can shorten the defrosting time, increase the defrosting effect, and prevent freezing from forming on the fan and ceiling. It's about doing.

(Means for Solving the Object) In order to achieve the above object, the present invention aims to distribute the air in the outer and inner air passages formed between the outer box and the inner box of the case body, and the air in each air passage. a partition plate that partitions a part of the inner air passage in the width direction, two evaporators that are installed through the partition plate to perform cooling and defrosting alternatively, and air in the evaporator during defrosting. In a case equipped with a damper that closes an outlet, a bypass is provided to guide air between the evaporator and the damper on the side where the damper is closed to an outside air passage.

(Function) With the above configuration, the air on the defrosting side blocked by the damper is guided to the outside air passage through the bypass, so moisture is removed from between the evaporator and the damper during defrosting, and the damper is switched. Moisture will not get mixed into the downstream side of the damper even after the damper has been used. Furthermore, since air also flows through the evaporator during defrosting, the defrosting time is shortened.

(Embodiment) FIG. 1 shows an embodiment of a show case according to the present invention.

This show case is formed of a case body 10 having a U-shaped cross section on the outside, and the case body 10 is constituted by an outer box including a ceiling wall 11, a back wall 12, and a bottom wall 13. Therefore, since the front (right side in the figure) of the show case is open, the products inside can be freely taken out and taken out. Further, the case body 10 is made of a heat insulating material, and has a structure in which heat from the outside is not easily transmitted.
An underframe 14 is attached to the bottom of the case body 10 and supports the entire case on the floor.

Inside the case body 10, inner boxes 15 are installed at predetermined intervals, and on the inner surface of the inner box 15, product placement shelves 16 and mesh plates 17 are attached in three vertical stages. There is.

The space between the case body 10 and the inner box 15 is divided into two layers by an upper partition plate 19 and a lower partition plate 20, forming an inner air passage 21 and an outer air passage 22, respectively. Although not shown, the back wall 12 side of the outer air passage 22 is formed on both sides of the inner air passage 21. Therefore, the air between the bottom wall 13 and the partition plate 20 passes through both sides of the back wall 12 and then flows into between the ceiling wall 11 and the partition plate 19.

An air outlet 23 is provided on the upper outlet side of the inner air passage 21 and the outer air passage 22, and a suction port 24 is provided on the lower inlet side.

On the other hand, a blower 25 is arranged between the back wall 12 and the inner box 15 with the fan facing upward. Therefore, if the blower 25 is operated, the inner air passage 2
1 and the outside air passage 22 circulate in the direction of the arrow. Further, the air flowing out from the air outlet 23 is sucked into the lower suction port 24, and a so-called air curtain is formed on the front surface of the case.

A thermometer 26 is attached to the front of the ceiling wall 11 and is visible from the outside. Furthermore, a fluorescent lamp 27 is provided on the upper inner surface of the inner box 15 to illuminate the inside of the show case.

Inside the inner air passage 21, there are two
evaporators 29 and 30 are arranged. Each evaporator 29, 30 has a pipe or coil (not shown) through which refrigerant flows, and is configured to perform cooling or defrosting operations alternately or simultaneously by a predetermined control device. Therefore, the suction port 24
The air flowing into the inner air passage 21 from the evaporator 2
After being cooled by one or both of the air outlet 9 and 30, it moves upward as shown by the solid arrow and flows out from the air outlet 23 downward. On the other hand, the uncooled outside air flows into the outside air passage 22 from the suction port 24 as shown by the dashed-dotted arrow, moves upward through the passages on both sides of the back wall 12 (not shown), and then passes through the ceiling wall. 11 and flows out from the outlet 23.

A damper box 31 is installed above the partition plate 28, as shown in FIGS. 2 and 3, and a plate-shaped damper 32 is housed in the damper box 31. Further, a motor box 33 is disposed at one end of the damper box 31, and a motor (not shown) capable of forward and reverse rotation is housed within the motor box 33. Damper 3
A shaft 34 is integrally attached to one side edge of the shaft 3.
One end of 4 is connected to the aforementioned motor shaft. Therefore, the damper 32 is rotated together with the shaft 34 by the motor, and any of the air passages partitioned by the partition plate 28 can be closed.

The damper 32 closes the air passage on the side of the evaporator that is undergoing defrosting operation by a predetermined control device (not shown), thereby preventing hot air in this area from mixing with cold air. Further, when both the evaporators 29 and 30 perform a cooling operation, the damper 32 is in a neutral state and opens both passages.

The damper 32 has two parts as shown in FIGS. 4 and 5.
It is composed of two perforated plates 35 and 36, and an intermediate plate 37 sandwiched between the two perforated plates 35 and 36. The perforated plates 35 and 36 have a large number of small holes 35 for air circulation.
a, 36a are bored. These two perforated plates 3
When inserting the middle plate 37 between 5 and 36, the damper 32
A two-layer space is formed in the space, and two openings 38 and 39 are formed at the ends. In addition, in FIGS. 4 and 5, the thickness of each plate is omitted.

On the other hand, two square holes 40 and 41 are provided at the end of the damper box 31, as can be seen from FIG. These square holes 40, 41 are provided corresponding to the closed position of the damper 32, and serve as a bypass for guiding the air on the damper closed side to the outer air passage 22, as shown by the arrow in FIG. That is, when the damper 32 closes the passage on the evaporator 30 side, the opening 39 and the square hole 41 communicate with each other, and when the damper 32 closes the passage on the evaporator 29 side, the opening 3
8 and each hole 40 communicate with each other.

6 and 7 show the shutter plate 4 of this embodiment.
2 is shown. This shutter plate 42 has a disc-shaped boss 43 that protrudes at the center.
A hole 44 is provided in the axial direction. Further, the shutter plate 42 is formed with an elongated hole 45 extending substantially in the radial direction. Therefore, the shutter plate 4
If the hole 44 of No. 2 is inserted into the shaft 34 of the damper 31 as shown in FIG.
rotates together with the damper 31 and the shaft 34. Further, when attaching the shutter plate 42 to the shaft 34, it is necessary to match the inclination angles of the elongated hole 45 and the damper 31.

Next, based on FIGS. 8, 9 and 10,
The operations of the damper 32 and the shutter plate 42 will be explained. In FIG. 9, the damper 32 closes the air passage on the evaporator 30 side, and the air in the inner air passage 21 is cooled through the evaporator 29 and directed upward as shown by the thick arrow. At this time, the air on the side of the evaporator 30 undergoing the defrosting operation is blocked by the damper 32 and therefore does not mix with the cooling air. Therefore, blower 2
5 and walls will be prevented from freezing.

On the other hand, the elongated hole 45 of the shutter plate 42 communicates with the opening 39 of the damper 32, as can be seen from FIG. Therefore, the air on the evaporator 30 side flows through the small holes 36a of the perforated plate 36 (FIG. 8) between the perforated plate 36 and the middle plate 37, and enters the square hole 41 of the damper box 31 and the shutter plate. It flows out to the outer air passage 22 through the long hole 45 of 42. By letting air escape through this bypass passage, the defrosting time of the evaporator 30 can be shortened, and the defrosting effect can also be increased.

Next, when the control circuit is switched and the evaporator 29 operates to defrost and the evaporator 30 operates to cool, the 10th
As shown in the figure, the damper 32 rotates clockwise to close the air passage on the evaporator 29 side. Further, the shutter plate 42 also rotates together with the damper 32, and the elongated hole 45 is connected to the other square hole 40 of the damper box 31 (FIG. 2).
communicate with. Therefore, the air on the evaporator 29 side is
Small hole 35a of perforated plate 35, opening 38 (FIG. 8),
Square hole 40 (Fig. 2), long hole 45 in shutter plate 42
The air flows out to the outer air passage 22 through the air. That is, by reversing the damper 32, the bypass passage is also switched. After being cooled by the evaporator 30, the air in the inner air passage 21 moves upward as indicated by the thick arrow.

In the above embodiments, the bypass passages are switched using a disc-shaped shutter plate that operates in conjunction with the motor, but it is also possible to switch the bypass passages using a solenoid or an actuator.

Further, bypass passages other than the small holes 35a, 36a of the damper 32 and the square holes 40, 41 of the damper box 31 may be configured.

(Effects of the invention) As detailed above, in the case of the invention, two bypass systems are provided that lead from the inside air passage to the outside air passage, and only the bypass on the damper closing side (defrosting side) is provided with the shutter plate. Since the structure is such that the air blower is opened, it is possible not only to shorten the defrosting time and improve the defrosting effect, but also to prevent the formation of ice on the blower and the ceiling wall.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing the show case of the present invention, Figs. 2 and 3 are perspective views of the damper box, Fig. 4 is a perspective view of the damper, Fig. 5 is an exploded perspective view of the damper, and Fig. 6. is a front view of the shutter board, No. 7
8 is an enlarged sectional view of the bypass, and FIGS. 9 and 10 are vertical sectional views showing the operating states of the damper and the shutter plate. In the figure, 10...Case body, 15...Inner box, 2
1...Inner wind passage, 22...Outer wind passage, 25...
...Blower, 29, 30... Evaporator, 31... Damper box, 32... Damper, 40, 41... Square hole, 42... Shutter plate.

Claims (1)

[Scope of claim for utility model registration] (1) Outer and inner air passages formed between the outer box and the inner box of the case body, a blower that circulates air in each air passage, and one of the inner air passages. The evaporator is equipped with a partition plate that partitions the area in the width direction, two evaporators that are installed through the partition plate to selectively perform cooling and defrosting, and a damper that closes the air outlet of the evaporator during defrosting. A show case characterized by being provided with a bypass that guides air between the evaporator and the damper on the side where the damper is closed to the outside air passage. (2) The damper has two perforated plates facing each other with a middle plate in between, the periphery of which is covered by a damper box, and the damper box connects one end of the damper at each closed position with the outer airflow. The bypass includes a hole in the perforated plate, a gap between each perforated plate and the middle plate, and each hole in the damper box, and the bypass includes a hole in the perforated plate, a gap between each perforated plate and the middle plate, and each hole in the damper box, and Utility model registration claim No. (1) characterized in that a shutter is provided between the passageway and the damper to open only the bypass on the closed side of the damper.
The case described in section. (3) Utility model registration claim No. (2) characterized in that the shutter is composed of a rotary plate with one hole communicating only with the bypass on the damper closing side.
The case described in section.