JPH0746017B2 - How to chill the freezer showcase - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to a cold air forced convection type frozen showcase suitable for storing frozen desserts such as ice cream.

2. Description of the Related Art In a freezer showcase, a partition wall having a U-shaped cross section is arranged inside a heat insulating wall having an open upper surface to define a product storage section inside and a cold air circulation duct outside. The cold air flow crosses the upper surface of the product storage section, and a cool air bypass path is formed above the bottom surface of the partition wall at an appropriate interval, and a part of the cool air toward the upper cool air outlet is bypassed. Japanese Utility Model Publication No. 52-22673 discloses a cold air inlet for introducing a passage into a partition wall.

According to the technique of the above publication, since the flow rate of the cool air that crosses the upper surface of the storage portion is larger than that of the cool air that flows in the bypass passage, a container with an upper opening filled with, for example, ice cream as a product is stored in the storage chamber. When it was stored in a freezer and stored frozen, the ice cream near the top opening of the container was held harder than the internal ice cream, and there was a problem that it was difficult to scoop with the disher. In addition, the ice cream surface is particularly dried during non-business hours when the external heat load is small, such as at night, and there is a brittleness that causes the quality of the ice cream to deteriorate.

Therefore, it is an object of the present invention to provide a freezing showcase capable of appropriately managing the temperature of stored products by devising the flow of cold air in the product storage unit.

[Structure of Invention]

Means for Solving the Problems The present invention provides a cold air circulation method for a frozen showcase in which cold air is forcibly circulated in a storage room in order to solve the above-mentioned problems, and a top opening which is stored in the storage room and filled with frozen desserts is provided. A small amount of cold air flows along the upper surface of the container, a large amount of cold air flows along the side and bottom surfaces of the container, and a larger amount of cold air flows along the side surface than the amount of cool air flowing along the bottom surface. It is the one.

Action A large amount of cold air flowing along the side surface of the container has the effect of mainly cooling the side surface and bottom surface of the container, and the heat transfer from this side surface and bottom surface cools the frozen dessert from the surroundings, thereby preserving the frozen dessert in a predetermined (frozen) state. A small amount of cold air which is maintained at the temperature and flows along the upper surface of the container has a function of cooling the surface of the frozen dessert by direct contact with the indirect cooling from the surroundings. I try to keep it higher than the temperature.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

(1) shown in FIG. 1 is a face-to-face refrigeration showcase called a dipping case, which includes a heat-insulating box body (2) having an open top surface and a transparent plate ( 4), (5), an opening (6) for product handling on the sales side surface, that is, a back surface, and a transparent door (7) for opening and closing the opening (6). A lid (3) arranged in the upper opening of (2) and a compressor, a condenser, a blower (none of which are shown), which are formed below the heat insulating box body (2), are housed and installed. Machine room (8)
Composed of and.

Reference numeral (10) is a metal partition plate having a U-shaped vertical cross section, which is provided at an appropriate distance from the inner surfaces of the front and rear walls of the heat insulating box main body (2) and has front and rear left and right walls and a bottom wall. A cold air passage (11) is formed on the outer periphery of the front and back walls of the plate (10) and below the bottom wall, and a plate fin type cooler (13) and an axial flow type air blower (14) are provided below the bottom wall. A cooling chamber (12) is formed, and a storage chamber (16) is formed in which a plurality of containers (hereinafter referred to as bats) (15) called bats (15) filled with frozen dessert such as ice cream are stored. ing.

A fixing device (17) for aligning and fixing a plurality of bats (15) in an orderly and efficient manner is arranged above the storage chamber. The bat (15) is formed of a material having excellent water resistance, for example, corrosion-resistant steel such as stainless steel, and has a trapezoidal shape and a filling portion (18) of an upper surface opening for filling with ice cream and a horizontal portion around the filling portion. And a flange portion (19) mounted on the fixing device (17), and the flange portion (19) has its end bent downward over the entire circumference for protection. Further, the flange portion of each bat is placed on the fixing device (17) with its long sides or short sides in contact with or extremely close to the flange portions of the adjacent bats.
Also, the fixing device (17) functions as a partition plate that partitions the storage chamber (16) into a space above and below the fixing device in a vertical relationship.

On the front wall (10A) and the back wall (10B) of the partition plate (10), the parts corresponding to the gaps formed between the side surfaces of the bat when the bat (15) is fixed to the fixing device (17). First each
The suction port (21) and the first blowout port (22) are formed, and the first suction port (21) and the first blowout port (21) and the first blowout port (22) are formed at appropriate positions lower than the first suction port (21) and the first blowout port (22). 1 outlet (22)
A second suction port (not shown) and a second air outlet (23) having an opening area smaller than that of the second suction port (23) are formed in advance. The cool air passage (11) is a return passage (11A) on the outer periphery of the front wall (10A) of the partition plate (10), a cooling chamber (12) below the bottom wall, and a supply passage (11B) on the outer periphery of the back wall (10B).
And a gap formed between the upper surface of the storage chamber (16) and the side surfaces of the bat, and a gap between the bottom surface of the bat and the partition plate (10). First outlet (2 in the supply path (11B)
2) An air flow rate adjusting plate (30) for adjusting the upward flow of cool air is arranged above the air flow rate adjusting plate (30) and the upper surface of the fixed bat (15) is horizontally cooled. To form a top surface outlet (31) that is horizontally opened. The air flow rate adjusting plate (30) is blown out from the first air outlet (22) and the second air outlet (23) formed in the back wall (10B) to the storage chamber and the upper air outlet (31). The cold air flow rate is a fixed ratio that increases the former, for example
The opening area is set so that the flow is split at about 7: 3. On the other hand, an upper surface blowing port (32) for collecting the cool air blown from the upper surface blowing port (31) is formed in the upper part of the return path (11A). A heat insulating wall (33) made of a heat insulating material is provided on the lower surface of the bottom wall (10C) of the partition plate (10) so that the thermal influence of the warm air during defrosting of the cooler (13) is exerted on the storage chamber side. This warm air is not transmitted, and this warm air is supplied to the supply path (11B) and the return path (11B).
In order to prevent it from flowing out to A), hanging parts (33B) (33C) are formed on the supply path side and the return path side.

A bat (15) is provided below the blower (14) of the cooling chamber (12).
A storage chamber (35) is formed, but a heat insulating wall (36) is arranged on the upper surface of the cooling chamber (12) so as not to directly receive the cool air in the axial direction by the air blower (14). A part of the cold air is guided to the storage room (35) through the communication hole (37). Reference numeral (38) is a branch plate that divides the cool air discharged from the cooling chamber (12) into the one toward the supply path (11B) and the one toward the communication hole (37).

Next, the cold air circulation will be described based on the solid and dotted arrows in FIG.

The air (cool air) that has been heat-exchanged and cooled in the cooler (13) is sent to the outside of the cooling chamber (12) by the blower device (14). The discharged cool air is divided into the supply passage (11B) and the communication hole (37) by the branch plate (38) (the ratio of the divided flow may be the former 9: the latter 1). Supply path (11
The cool air (solid arrow) flowing into B) is the air volume adjustment plate (30)
According to an appropriate ratio [that is, in the present example, a ratio of 7: 3 (this is approximately 6: 3 when the cold air exiting the cooling chamber (12) is 10)], the first and second outlets (22) ( 23) and the top outlet (3
1) The air volume is adjusted to and. The cool air that has flowed into the storage chamber (16) through the first outlet port (22) cools the bat side portion along the gap formed between the side surfaces of the bat (15) while cooling the front wall (10A). Toward the return path (11A) mainly from the first suction port (21) (the wind speed at this time may be about 2 m / s, for example), and also through the second outlet port (23) to the storage chamber (16)
The cool air that has flowed into the inside of the bat (15) mainly cools the lower part of the bat along the peripheral surface of the bat (15) and reaches the return path (11A) mainly from the second blow-in port (not shown) of the front wall (10A). On the other hand, the cold air blown horizontally to the upper surface of the storage chamber (16) through the upper surface outlet (31) (the wind speed at this time may be, for example, about 0.6 m / s), along the upper surface of the bat (15). While cooling the surface of the frozen dessert, it is guided to the upper surface suction port (32), merges with the cold air that has passed through (the suction port of) the front wall in the return path (11A), and returns to the cooling chamber (12) to cool the cooler (13). ) Is re-cooled by heat exchange. On the other hand, the cold air toward the communication hole (37) [Refer to the dotted line arrow (If the cold air exiting the cooling chamber (12) is 10, this cold air is 1
Is a cold air return port formed at the front end of the heat insulating wall by cooling the upper surface and side surfaces of the bat stored in the storage chamber (35) by being guided to the upper surface of the storage chamber (35) through the communication hole (37). (3
9) is guided to the lower surface of the cooler (13), recooled by the cooler (13), and guided to the blower (14) side.

Since the flange portion (19) of each bat (15) and the fixing device (17) partition the storage chamber (16) into upper and lower parts, a cold air flow (mainstream )
And the cold airflow (substream) flowing along the upper surface of the vat do not merge in the storage chamber (16), that is, the cold airflow can cool the vat and the frozen dessert with independent flows, In particular, a side flow having a small flow rate and a low velocity is favorably formed without being affected by the main flow.

According to such a cold air circulation method, a large amount of cold air flowing along the side surface of the bat (15) and a small amount of cool air flowing along the bottom surface of the bat (15) predominantly cause the side surface and the bottom surface of the bat (15). The frozen dessert is cooled and maintained at a predetermined temperature (for example, about −15 ° C.) by heat conduction, and the surface of the frozen dessert is directly cooled by a small amount of cool air flowing along the upper surface of the bat (15) to cover the lid body (3). It also plays the role of an air curtain that prevents the effects of heat radiation such as light that enters through the window. Further, since the amount of cold air (secondary flow) flowing on the upper surface of the bat (15) is smaller than the amount of cold air (hand flow) flowing along the side surface and the bottom surface, the cooling becomes subordinate to that of the side surface and the bottom surface, and the frozen dessert is formed. By making the temperature of the upper surface side of the scooping higher than that on the side surface side (for example, about -12 ° C), the scooping operation of the frozen dessert is facilitated and the drying of the surface of the frozen dessert is suppressed. Then, the main stream and the sub stream flow independently of each other in the storage chamber (16) by the flange portion (19) and the fixing device (17), so that the sub stream can be prevented from being disturbed by the main stream. .

〔The invention's effect〕

According to the method for circulating cold air as described in detail above, the side surface and the bottom surface of the container are mainly cooled by a large amount of cold air flowing along the side surface and the bottom surface of the container, and the frozen dessert is maintained at a predetermined temperature by heat conduction, The surface of the frozen dessert is subordinately cooled by direct contact with a small amount of cold air flowing along the upper surface of the container, so that the temperature of the upper surface of the frozen dessert in the container is higher than that of the side surface. Therefore, it is possible to maintain the frozen dessert on the upper surface side at a temperature at which it is easy to scoop. Moreover, the amount of cold air flowing along the side surface is larger than the amount of cold air flowing along the bottom surface, so that the sweetness of the coldness at the top of the container can be eliminated compared to the case where a large amount of cold air flows along the bottom surface, and it is close to sales. The frozen dessert at the top can be managed at an appropriate product temperature. Further, the cold air flowing along the upper surface of the container can function as an air curtain that is less likely to be affected by heat radiation such as light incident from the upper surface of the freezing showcase. Furthermore, since the amount of cold air that comes into contact with the surface of frozen desserts is small, it is possible to avoid extreme drying of the surface of frozen desserts even during emergency times when the external heat load is small, such as at night. It is possible to improve efficiency.

[Brief description of drawings]

Each drawing shows one embodiment of the present invention, FIG. 1 is a vertical sectional view of a refrigerating showcase, FIG. 2 is a perspective view of a partial sectional view for explaining the supply passage side, and FIG. 3 is A- of FIG. A sectional view and FIG. 4 are sectional views taken along the line BB of FIG. (1) …… Frozen showcase, (15) …… Bat (container), (16) …… Storage room, (21) …… First suction port, (2
2) …… First outlet, (23) …… Second outlet, (31)…
… Top surface outlet, (32) …… Top surface inlet.

Claims (1)

[Claims] 1. In a freezing showcase in which cold air is forcedly circulated in a storage chamber, a small amount of cold air is caused to flow along the upper surface of a container having a top opening which is stored in the storage chamber and filled with frozen desserts, and along the side and bottom surfaces of the container. A large amount of cold air,
A cold air circulation method for a frozen showcase in which the amount of cold air flowing along the side surface is larger than the amount of cold air flowing along the bottom surface.