JPS598745B2 - open case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an open showcase with an improved forced circulation cold air flow blown through an opening formed in the main body.

In an open showcase in which the opening is closed with a single layer of cold air flow, the cold air flow blown out from the outlet to the opening is fluid air, so the still air that remains outside, that is, the outside air, is drawn in by its entrainment action. After absorbing and closing the opening, heat is exchanged in the cooler and recirculated through the cold air passage.

When the cold air flow that absorbs outside air exchanges heat with the cooler, the moisture from the outside air forms frost and adheres to the cooler, so frost builds up on the cooler quickly (heat exchange becomes poor), and as a result, This has the disadvantage that the number of defrosting operations increases, and the temperature rise due to frequent defrosting causes a decline in the quality of stored products.

To solve this problem, a protective air stream is added to the outside of the cold air stream to reduce the intrusion of outside air into the cold air stream, which slows down the frosting of the cooler and reduces the number of times of defrosting.

However, a passage for circulating the protective airflow must be formed within the main body separately from the cold air passage, and in order to meet this requirement, it is necessary to choose between increasing the main body or reducing the storage volume. Moreover, it has disadvantages such as a complicated structure and high manufacturing cost.

The present invention has been made in view of the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings. 1 is an open showcase with an opening 2 on the top surface, and a heat insulating material is provided between an outer box 3 and an inner box 4. The main body is composed of a heat insulating wall 5 filled with water, and a partition plate 6 is arranged at an appropriate distance from the heat insulating wall 5 to form a cold air passage 7 and a storage chamber 8.

A cooler 9 and a blower 10 are housed in the cold air passage T, and both ends thereof communicate with a cold air outlet 11 and a cold air suction port 12 provided in the opening 2.

The cold air outlet 11 is provided with a rectifying plate 16 having a first opening row 14 and a second opening row 15 in which cold air holes 13 are bored, and partitioning the first opening row 14 and the second opening row 15. A first guide plate 17 having an L-shaped cross section is provided on the outside of the rectifying plate 16 so as to be parallel to the upper end bent portion 18 of the partition plate 6. The second opening row 1 is parallel to the guide plate 17 and the inside of the tip of the heat insulating wall 5.
5, and a forced circulation cool air flow is provided in the opening 2 by the upper end bent portion 18 of the partition plate 6, the first guide plate 17, the second guide plate 19, and the inside of the tip of the heat insulating wall body 5. Blowout passages 20, 21, and 22 are formed to guide the air.

Note that the lower end of the first guide plate 17 is connected to both the first and second opening rows 14.
, 15, and the lower end of the second guide plate 19 is arranged above the second opening row 15.

The cold air holes 13 forming the first opening row 14 are formed so that the total opening area thereof is larger than the total opening area of the cold air holes 13 forming the second opening row 15. There is.

Therefore, the first and second opening rows 14, 15 are not limited to holes, but may be slit-type cuts, and in short, the total area of the openings may be made wider as it progresses toward the storage chamber.

Further, the suction openings a of the blowout passages 20, 21, 22
, b, and c are made to become wider as one advances toward the storage chamber 8.

That is, the area of suction opening a>the area of opening b>the area of opening C.

Although both sides of the blowout passage are formed by the upper bent portion 18 of the partition plate 6 and the inside tip of the heat insulating wall 5, the present invention is not limited to this, and may be formed by other guide plates. Good too.

Moreover, the blow-off openings d, e, of the blow-off passages 20, 21, 22,
f have approximately the same opening area as shown in FIG.

Therefore, according to the above-mentioned configuration, the cold air heat-exchanged by the cooler 9 is turned into a forced circulation cold air flow by the blower 10 and is sent to the cold air outlet 11 as shown by the dashed line arrow in the drawing, and the rectifier plate 16 and the partition plate 6 are folded. At the bending part 18, the dynamic pressure generated by the blower 10 is converted into static pressure, and the flow is divided between the first opening row 14 and the second opening row 15 of the baffle plate 16, and most of the pressure is guided to the bending part 18 and transferred to the first opening row. 14 and flows into the outlet passage 20 on the storage chamber side, the other part passes through the second opening row 15 and is further divided into outlet passages 21 and 22, and then flows into the outlet openings d, e,
The cool air is blown out from the opening 2 and closes the opening 2, but since the cold air flowing into the blowing passage 20 has the least resistance, it is blown out into the opening 2 at a high speed and with a large flow rate.

The speed and flow rate of the cold air flow blown out from the next blow-off passage 21 and the speed and flow rate of the cold air flow blown out from the next blow-off passage 22 gradually decrease.

Therefore, the speed and flow rate of the cold air flow that closes the opening 2 increases as it moves inward, so that it serves as the outermost cold air flow (i.e., a protective air flow).

) is minimized.

The present invention first divides the cold air flow that has undergone heat exchange in the cooler into the inside and outside through both the first and second opening rows of the rectifying plate so that the flow rate on the inside is high and the flow rate on the outside is low. The cold air flow from the first row of openings is guided by the first guide plate to the outlet passage in the innermost layer, and the cool air flow from the second row of openings is guided by the second guide plate to the outlet passage in the middle layer and the outlet passage in the outermost layer. In addition, the flow rate of the cold air flow in the outlet passage in the middle layer can be divided so that it is larger than that in the outlet passage in the outermost layer, so the cold air flow blown out to the opening is divided into three layers, from the inside to the outside. In addition to the fact that the speed and flow rate can be set at a gradient so that the speed and flow rate gradually decrease over Since the pressure of the airflow can be increased and the cold airflow can be directed toward the rectifier plate, more cold airflow can be supplied to the first opening row than to the second opening row.

As a result, not only the rectification characteristics of the cold air flow are improved, but also
The speed of the cold air flow in the innermost layer is increased to improve the cooling effect of the storage room, and at the same time, the speed of the cold air flow in the outermost layer is slowed down to reduce the entrainment of outside air and prevent frost formation on the cooler. slow down,
It has the effect of reducing the number of times of defrosting.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of the open showcase of the present invention, Fig. 2 is a vertical sectional view of the open showcase of the present invention;
The figure is an enlarged view of the main part of FIG. 1, and FIG. 3 is a perspective view of FIG. 2. 6... Division plate, 11... Cold air outlet,
13... Cold air hole, 16... Current plate, 1
7.19... Information board, 20, 21, 22...
...Blowout passage.

Claims (1)

[Claims] 1. Constructing a main body with an open upper surface made of an insulating wall, and arranging partition plates at appropriate intervals from the insulating wall to form a cold air passageway and a storage room in which a cooler and a blower are installed, A cold air outlet and a cold air suction opening are formed opposite to each other at both ends of the passage, and at least two L-shaped first and second guide plates are disposed above and below the outlet to provide at least three outlets. In an open showcase in which a passage is formed, the upper end of the partition plate on the outlet side is bent outward to form a bent part, and a rectifying plate with a plurality of cold air holes is arranged outside the bent part. to form a first opening row and a second opening row whose total opening area is smaller than the first opening row, and place the lower end of the first guide plate above the boundary between the first and second opening rows. 2 Place the lower end of the guide plate on the second
The open showcase is arranged at the upper part of the row of openings, and the suction opening area of the blowout passage becomes wider as it progresses toward the storage chamber.