JP3562869B2 - Open showcase - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a cold air circulation type multi-stage open showcase, and more particularly to a structure of an air curtain outlet thereof.
[0002]
[Prior art]
FIG. 2 is a conventional configuration diagram of a multi-layered open showcase of a two-layer air curtain system, in which an inner case 1b is surrounded between an outer case 1a and an inner case 1b of a front open case body 1 to form an inner / outer double. An inner duct 2 and an outer duct 3 (cool air circulation duct) are defined. Air curtain outlets 2a and 3a are provided on the upper side toward the front opening of the case body 1, and air curtain inlets are provided on the lower side. 2b and 3b are open. A cooler (evaporator for a refrigerator) 4 and an inner fan 5 are housed in the inner duct 2, an outer fan 6 is housed in the outer duct 3, and a honeycomb is installed in the air curtain outlets 2a, 3a. A rectifier 7 is incorporated. Numeral 8 denotes a product display shelf, which is arranged in the upper and lower tiers of the inner box 2.
[0003]
The cool operation of the open showcase having such a configuration is well known. During the cool operation, cool air is circulated and blown to the inner duct 2 and the outer duct 3, and the inside and outside of the case main body 1 are opened through the air curtain outlets 2a and 3a. The inner air curtain A and the outer air curtain B of the layer are formed by blowing to keep the refrigerated or frozen products displayed on the product display shelf 8 in the refrigerator.
[0004]
[Problems to be solved by the invention]
In such an open showcase, since the temperature inside the refrigerator is low, a pressure difference corresponding to the vapor pressure difference is generated between the inside and the outside of the refrigerator, and the air curtains A and B curve in the direction of being drawn into the refrigerator. This phenomenon is called the draft effect. In this case, when the airflow of the air curtain is largely curved inside the refrigerator, the laminar flow of the air curtain interferes with the leading edge of the product display shelf 8 and is greatly disturbed. As a result, the amount of heat entering the refrigerator increases. As a result, undesired problems such as a decrease in the cooling performance and an increase in the amount of frost on the cooler 4 occur.
[0005]
If the wind speed of the air curtains A and B blown out from the honeycomb rectifier 7 is increased by increasing the rotation speed of the fans 5 and 6, the influence of the pressure difference between the inside and the outside of the warehouse is reduced, and the air curtains A and B are not affected. Although the degree of curvature is reduced, when the wind speed increases, the amount of outside air mixed into the air curtain airflow through the boundary surface with the surrounding outside air increases, and the heat load of the cooler 4 and the amount of frost increase.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to solve the above-mentioned problems, and to form an ideal cold air curtain having high heat shielding performance with less influence of a draft effect at an opening of a case body. An object of the present invention is to provide an open showcase.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, an air curtain having a high wind speed is provided between a honeycomb rectifier incorporated in an air curtain outlet opening toward an opening of a case body and an inner side wall surface of the outlet. It is preferable to form a slit for blowing out the layer and provide an air blowing guide extending in the air curtain blowing direction along the slit on the inside side of the air curtain blowing outlet.
[0008]
[Action]
When the cool air is circulated and blown by the fan through the cool air circulation duct during the cool keeping operation in the above configuration, the static pressure on the upstream side of the air curtain outlet incorporating the honeycomb rectifier increases, and a part of the cool air flow passes through the inside slit, The remainder blows out to the opening of the case body through the honeycomb rectifier to form an air curtain layer. In this case, since the slit has a lower ventilation resistance than the honeycomb rectifier, the air curtain layer blown out from the slit is faster than the air velocity blown from the honeycomb rectifier. Therefore, the air curtain blown out from the air curtain outlet has a wind speed distribution in which the wind speed is high on the inside side facing the interior and the wind speed is low on the outside. As a result, when viewed as a whole, the draft effect in which the air curtain is curved so as to be drawn into the interior of the refrigerator due to the pressure difference between the inside and the outside of the refrigerator is small, and the layer due to the interference with the product display shelf is accordingly reduced. In addition to preventing turbulence in the flow, the outside side that blows out through the honeycomb flow rectifier forms a laminar flow while the wind speed is low, so there is less outside air entrainment, and as a result, an air curtain with less outside air heat entering the opening of the case body A blowout will be formed.
[0009]
In addition, by providing an air blowing guide extending in the air curtain blowing direction along the slit on the inside side of the air curtain blowing outlet, it is possible to form a turbulent flow at the slit outlet portion and form a higher performance air curtain. .
[0010]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 (a) and 1 (b). The same reference numerals in FIG. 1 correspond to those in FIG. 2 and the description thereof will be omitted.
In the configuration of FIG. 1, a narrow slit 9 is formed on the inside of the honeycomb straightening body 7 along the longitudinal direction of the air outlet on the inside side of the air curtain outlet 2a of the inner duct 2. An air outlet guide 10 extending in the air curtain outlet direction is provided at the inside opening end of the outlet along the slit 9.
[0011]
With this configuration, during the cold-holding operation of the showcase, the inner and outer two-layer inner air curtain A and outer air curtain B are provided at the front opening of the case body 1 from the inner duct 2 and the outer duct 3 through the air curtain outlets 2a and 3a. At the air curtain outlet 2 a of the inner duct 2, part of the cool air flow blows out at a high wind speed through the slit 9, and the rest flows out through the honeycomb rectifier 7. Thereby, the wind speed distribution in the cross section of the air curtains A and B is such that the wind speed is highest on the inside side near the inside of the refrigerator and decreases on the outside side as shown in the figure. Further, the cool airflow blown out from the slit 9 at a high wind speed flows toward the air curtain inlet 2b while maintaining a laminar flow state along the plate surface of the air blowout guide 10 without generating a turbulent flow at the opening end. .
[0012]
As a result, the degree to which the inner air curtain A is drawn into the interior of the warehouse due to the effect of the draft effect caused by the pressure difference between the interior and exterior of the interior is reduced, and the inner air curtain A interferes with the front edge of the product display shelf 8 to form the layer of the air curtain. Disturbed flow is also prevented. In addition, the laminar flow of the air curtain A that blows out to the outside of the air curtain outlet 2a through the honeycomb rectifier 7 and the outer air curtain B that blows out through the air curtain outlet 3a of the outer duct 3 have a low wind speed and the amount of outside air involved. Is also reduced. As a result, an air curtain with little heat intrusion into the outside air and a high heat shielding effect is blown out at the front opening of the case body 1.
[0013]
In the illustrated embodiment, a multi-stage open showcase has been described, but an air curtain with less heat intrusion into the outside air can be similarly formed by adopting such an air curtain outlet structure in a flat open show case.
[0014]
【The invention's effect】
As described above, according to the configuration of the present invention, it is possible to blow out an ideal air curtain that effectively suppresses the invasion of outside air into the opening of the case main body, and thereby, the cooling performance of the showcase It can greatly contribute to improvement.
[Brief description of the drawings]
1A and 1B are configuration diagrams of an embodiment of the present invention, in which FIG. 1A is a cross-sectional configuration diagram of the entire multi-stage open showcase, and FIG. 1B is an enlarged perspective view of an air curtain outlet in FIG. ] Cross-sectional view of the entire configuration of a conventional multi-stage open showcase [Description of reference numerals]
1 Case body 1a Outer box 1b Inner box 2 Inner duct (cool air circulation duct)
2a Air curtain outlet 2b Air curtain inlet 3 Outer duct 4 Cooler 5 Inner fan 6 Outer fan 7 Honeycomb rectifier 8 Product display shelf 9 Slit 10 Air outlet guide

Claims (1)

A cool air circulation type open showcase that blows out a cool air curtain at the opening of the case body through a cool air circulation duct defined between the outer case and the inner case of the case body, opened toward the opening of the case body to form a slit for blowing air curtain layer has fast wind speed between the inside side wall surface of the honeycomb flow regulator incorporated in the air curtain outlet and air outlet, the inside side of the air curtain blowing port, along the slit An open showcase characterized by an air outlet guide that extends in the air curtain outlet direction.

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