JPS6196381A - Flat type showcase - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a flat showcase having an air curtain formed at the top opening by forced circulation of cold air.

(b) The conventional refrigeration showcase shown in Japanese Patent Publication No. 52-22673 (70818) (hereinafter referred to as the 1st prior art) includes:
A heat insulating transparent plate is installed on the inside of the upper part of the front wall of the heat insulating wall with an open top surface, and the insulating transparent plate is slanted forward and downward, and a vertical insulating transparent plate is installed upright on the front wall soil of the compartment wall that defines the product storage area. While forming an outlet, the product storage section can be viewed from the outside through both insulating transparent plates, and a configuration is shown in which the forced circulation cold air that has crossed the top opening as an air curtain is returned to the cold air circulation duct from the suction port. .

Also, Japanese Patent Application Laid-open No. 59-112171 (F25D171
08) (hereinafter referred to as the second prior art), the flat showcase has a
The transparent plate and a second transparent plate erected on the inner surface of the upper part of the front wall of the heat insulating wall form an inlet for returning the cold air of the air curtain that has crossed the top opening to the cold air passage. A third transparent plate having a rearward extending portion is erected on the front wall soil of the heat insulating wall at a distance from outside of the wall, and the height dimension of each transparent plate is determined as follows: A configuration in which one transparent plate is used is disclosed.

(c) Problems to be Solved by the Invention In the first prior art described above, since the height of the vertical heat-insulating transparent plate is approximately 1/2 of the height of the inclined heat-insulating transparent plate, the cold air forming the air curtain is Everything must be returned to the duct through the suction port.
Become. As a result, the temperature on the back side of the slanted insulating transparent plate becomes above the dew point due to the cold air, but the surface exposed to the outside air becomes at a temperature below the dew point and condensation occurs, which only worsens the viewing effect through the slanted insulating transparent plate. However, there was also the problem that the customers' clothes were stained by the dew that flowed down from the slanted transparent insulating panels onto the front wall.

Further, the second prior art described above was made to solve the problem of the first prior art, but since the extended portion of the third transparent plate is intended to prevent cold air from overflowing 70-, 2,
The cold air that overflowed the second transparent plate enters the space between the third transparent plates. Therefore, a heating element is installed on the top of the front wall to constantly heat the air in the above-mentioned interval and maintain the temperature above the dew point on both the front and back surfaces of the third transparent plate.The thermal energy of this heating element also heats the returning cold air. There was a problem that caused an increase in the refrigeration load.

2) Means for Solving the Problems The present invention solves the problems of the first and second prior art techniques described above, in order to solve the problems of the first and second prior art techniques. Transparent window that slopes downward (4)
The height of the transparent plate α3 is set so that it overflows beyond the upper surface, the velocity of the returning cold air is made uniform with the baffle material e, and the upper surface of the transparent window (4) through which the overflow cold air flows is multi-sided. This is a flat showcase (1) formed into a curved surface with a Coanda effect surface α8.

(E) Using the working baffle material part, the speed of the returning cold air near the center is reduced and made uniform, and a part of this cold air is turned into cold air that passes over the transparent window (4) at the transparent plate (13); This overflow cold air (OA) is made to adhere to the Coanda effect surface α step of the transparent window (4) and is directed toward the lower part of the surface that slopes forward and downward.

(to) Example The present invention will be described in detail based on the drawings below.
Reference numeral 1 denotes a flat showcase whose main body is composed of a heat insulating wall (3) having an opening (2) for storing and taking out products on the upper surface thereof. The heat insulating wall has a transparent window (4) made of glass at the top of the front wall (3A) tilted forward and downward, and a bumper rail (5) is installed along the lower front side of the transparent window. It also forms an apron (3C) that extends in front of the upper part of the back wall (3B). (6) is a partition plate placed at an appropriate distance from the inner wall of the heat insulating wall. 8), and a passage (111) with one end facing forward to form an air outlet (9) and the other end opening upward to form a suction port, and a storage chamber (I2) are connected to an insulating wall (3). The upper part K of the front wall (6A) of the partition plate, together with the transparent window, makes it possible to see through the storage chamber a2 from the outside, and the storage room vis, mα20
A transparent plate (131) is installed upright to substantially pull up the load line. is also a lattice member located on the opening (2) side. (IF5 is a baffle material such as punching metal or a net placed below the suction port that also serves as a product fall prevention member. αη is a passageway of the rectifier. A heating element such as a 40W electric heater placed near the side of the flat showcase (1) constantly generates heat regardless of whether the flat showcase (1) is being cooled or defrosted. When driving,
The blower (8) is rotated in the forward direction to circulate the cold air that has been heat-exchanged by force into the cooler (as shown by the solid line arrow in Figure 2).
(2) During defrosting operation, a cold air curtain (AC) is formed to cool the storage room (1z), and the refrigerant supply to the cooler (7) is stopped and the blower (8) is rotated in reverse. , outside air is introduced into the passage aυ as shown by the chain arrow, and this outside air is used as a defrosting heat source in the cooler (for power defrosting).

The baffle material acts as a flow path resistance for the return cold air and is the third material.
As shown in the figure, when a large number of narrow small holes (16A) are formed in the longitudinal direction of the central portion, a large number of large holes (16B) wider than the small holes are formed at both ends, and the air curtain ( AC), the cold air near the center of the blower (8) where the dynamic pressure is high is significantly decelerated through the small hole (16A), while the cold air near the left and right sides where the dynamic pressure is low is passed through the large hole (16B). [The effect of reducing the deceleration width, maintaining the speed of the return cool air evenly in the width direction, and increasing the pressure of the return cool air upstream of it, and also generating over 70 - from the top center of the transparent window (4). Nanasu. In addition, FIG. 4 shows another embodiment in which a pressure baffle material haze is placed directly below the center of the product fall prevention member (16-1) to decelerate only the cold air near the center where the dynamic pressure is high in the returning cold air. The aim is to equalize the velocity of cold air in the width direction.

The transparent plate is provided at a height such that a portion of the returned cold air formed by the air curtain (AC) overflows over the top surface of the transparent window (4), and the top surface of the transparent window (4) It is formed as a multifaceted or curved surface to which cold air (OA) adheres, that is, a Coanda effect surface (111).This Coanda effect surface is a curved surface in the embodiment, but it is trapezoidal, that is, has three or more surfaces. Therefore, by both the transparent plate α floor and the baffle material (161), uniform overflow cool air (
Moreover, this overflow cold air (OA) can be directed downward along the front-down inclined surface of the transparent window (4) while remaining attached to the Coanda effect surface a8. . As a result, during cooling operation,
The evaporation effect of the overflow cold air (OA) can prevent dew condensation from occurring on the surface of the transparent window (4).

(G) Effects of the Invention As described above, the present invention comprises a transparent window which is erected in the front wall portion of the heat insulating wall constituting the main body and slopes downward toward the front, and a transparent window which is disposed within the heat insulating wall and defines a storage room. An air curtain is formed in a flat case in which a suction port is formed by a transparent plate erected on the front wall of the partition plate, and cold air that has crossed the upper surface opening is returned to the passage from the suction port. The height of the transparent plate is set so that a portion of the returned cold air exceeds the upper surface of the transparent window, and
A baffle material is provided between the suction port and the blower to reduce the speed of the cold air with high dynamic pressure in the returned cold air, and the upper surface of the transparent window is formed into a multifaceted or curved surface to form a Coanda effect surface. Therefore, both the transparent plate and the baffle material can uniformly overflow the entire width of the upper surface of the transparent window, and this overflow cold f
Since the Nacoanda effect can be applied to the surface of the transparent window by directing it downward from time to time, it can be continuously applied to the surface of the transparent window, so the evaporation effect of the overflow cold air can prevent condensation on the surface of the transparent window. The perspective effect of the storage room through can be maintained well.

[Brief explanation of the drawing]

The drawings all show embodiments of the flat showcase of the present invention,
Figure 1 is an enlarged perspective view of the main parts, Figure 2 is a longitudinal cross-sectional view of the entire body, and Figure 3 is an enlarged perspective view of the main parts.
The figure is a plan view of the main part, and FIG. 4 is a plan view of the main part of another embodiment. (2)...Top opening, (3)...Insulating wall, (4
)...Transparent window, (6)...Dividing board, al...Suction port, αυ...Passway, α2...08)...Coanda effect surface, (AC)...Air curtain ,(
OA)...overflow cold air. Applicant Sanyo Electric Co., Ltd. and one other agent Patent attorney Sano Shizuo 1wJ Figure 2

Claims (1)

[Claims] 1. A transparent window erected in the upper part of the front wall of the heat insulating wall constituting the main body and sloping downward toward the front, and a transparent window erected in the front wall of the partition plate disposed within the heat insulating wall and defining the storage room. In a flat showcase in which a suction port is formed by a plate and the cold air that has crossed the top opening as an air curtain is returned to the passage from the suction port, a part of the returned cold air that has formed the air curtain crosses the top surface of the transparent window. The height of the transparent plate is set so that it overflows, and a baffle material is provided between the suction port and the blower to reduce the speed of cold air with high dynamic pressure in the returned cold air, and the upper surface of the transparent window is A flat showcase that can be formed into multiple or curved surfaces to create a Coanda effect surface.