JPS58193077A - Open 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] This invention 8A is directed to an open showcase in which a front product loading/unloading opening is covered with a flow of cold air, and particularly relates to an improvement in the blowout structure of the cold air flow. .

A conventional showcase of this kind will be explained with reference to Fig. 1. (1) is an open showcase body with an outer wall having a heat insulating structure and an opening (2) for taking in and out of products in the front;
3) is a ceiling duct plate having a width equivalent to the lateral width of the main body (1), which is provided at a predetermined interval on the ceiling part of the inside of the main body (1), and (4) is the inside of the main body (1). A rear duct plate (5) having a width equivalent to the lateral width of the main body (1) is provided at a predetermined interval on the back surface of the main body (11).
The main body (1
), the ceiling duct plate (3), the rear duct plate (4) and the bottom duct plate (51) are sequentially connected to form the inside of the main body (11). It is divided into a product storage chamber (6) and a cold air circulation duct (7).(8) communicates with the cold air circulation duct (7) and is provided at the upper opening edge of the product loading/unloading opening (2). The cold air outlet (9) has a width approximately equal to the lateral width of the main body (1).(9) is provided at the lower opening edge facing the cold air outlet (8), and is connected to the cold air circulation duct ( 7), which has the same width as the cold air outlet (8).

O. and I are a blower and a cooler provided in the cold air circulation duct (7). Also, a is the product storage room (6)
There are several product shelves inside.

In the structure Rt as described above, due to the above-mentioned air supply mechanism and operation of the cooler aOt-K, friendly air is sucked in from the cold air suction port (9) as shown by arrow A and is passed through the cooler αυ.
The cooled air is cooled by the cold air outlet (
8), and is blown out as cold air from the cold air intake port (91).
K is sucked in, and an air curtain B is formed in the product loading/unloading opening (2), thereby maintaining the product storage chamber (61f: desired wet ash).

Next, the characteristics of this conventional air curtain will be explained with reference to FIG. 2 and FIG. 4. In this Yuzu open showcase, cold air is blown out at a certain speed from the cold air outlet (8), but at this time, due to the difference in speed between the air curtain and the air around the shoulders, there There was a disturbance, and 1!1iIil! around the rice supply! It is well known that humid air enters the low-source air curtain flow VC, and most of the heat load for cooling the open showcase t-Q is due to the above-mentioned outside air intrusion. It is also a well-known fact that

Figure 4 shows the relationship between this amount of outside air intrusion and the air curtain air volume (if W is considered as fixed during blowing, it can be considered as the blowing circumferential velocity), and the solid line (7) is for the conventional type. This is the characteristic of the air curtain. In conventional open showcases, as shown in Figure 1, the airflow W is relatively narrow (usually configured around 5G-110 degrees), and the amount of change in wind speed when the wind i# is increased. is also large, and as a result, due to the speed difference mentioned above, &
The above-mentioned outside air intrusion amount increases in proportion to the air curtain air volume. Therefore, in order to completely reduce the heat load on the open showcase, it is necessary to reduce K and the air curtain air volume tM as much as possible. However, on the other hand.

Temperature inside the product storage chamber (6) (hereinafter referred to as internal temperature fatigue) 1-
It is necessary to maintain the desired temperature level H, and there is inevitably a limit to the air curtain wind 10 reduction.

Next, the relationship between the air curtain air volume and the internal temperature will be explained. Figure 2 shows the relationship between the air curtain wind noise and the temperature width of the warehouse P3, and Figure 3 shows the relationship between the air curtain air volume and the required blowout air temperature5. The temperature inside the V warehouse is maintained at a desired temperature by the cold air blown out from the cold air outlet (8), and therefore the cold air blown out from the cold air outlet (8) is cooled in the product storage chamber (611). However, the temperature gradually rises, and the temperature rise reaches the maximum at the cold air suction port (9), where it is restarted by the cooler αD and the circulation is repeated.In this case, when the heat load is kept constant, the air curtain air volume is reduced. Follow the instructions.

It is a well-known fact that the rise in the mixed layer of the air curtain increases, and as the temperature of the air curtain increases, the temperature inside the refrigerator also increases from the top to the bottom.

As a result, as shown in value 21, there is an inversely proportional relationship between the air curtain air volume and the indoor temperature.
As t is lowered, the temperature inside the refrigerator increases. In addition, in order to maintain the average value of the internal temperature at a desired temperature, as shown in Fig. 3, it is necessary to lower the blowing air temperature as the air curtain MLi is lowered for the aforementioned reason. If you raise it, the upper limit of the temperature range in the refrigerator is now 1rT1degC.
Then, the required blowout air temperature at that time is t1°C, the air curtain air volume is 09kfil/h, and the outside air intrusion is 11ijg1kl//h.

As explained above, in the conventional open showcase air curtain configuration, when energy saving is considered, it is necessary to allow for an increase in the internal temperature, which may have a negative impact on the stored products. There were drawbacks. It is also necessary to reduce the temperature of the blowing air to some extent.
As a result, the temperature of the cooler inevitably decreases, resulting in a problem that the efficiency of the refrigerator also decreases.

The present invention has been made to eliminate the above-mentioned drawbacks, and is an air curtain for an open showcase that can reduce the intrusion of outside air, reduce the temperature inside the refrigerator, and improve the efficiency of the refrigerator. This can be provided in Configuration 7.

An embodiment of the present invention will be described below with reference to FIG. That is, in the figure, (tlS('zl and (9) SO
2 has the same configuration as the conventional one, but the ceiling duct plate (3
) is constructed from a perforated plate, so that it has a large number of cold air outlets on almost the entire surface. In addition, hollow cold air blowing members having a length that is almost the same as the width in the lateral direction of the product storage chamber (6) are installed in multiple stages in the product storage chamber (6) at a certain distance r4 in the height direction. In addition to being arranged approximately horizontally, this cold air blowing member Q? The circulation duct in the hollow space of ) (7) is connected to the duct (7), and furthermore. The lower part of the cold air blowing member αJ [11] is made of a perforated plate or the like, so that the lower surface thereof has a large number of cold air blowing ports on almost the entire surface thereof.

Lower ti! ] The side surface and top surface except for 1 are made of an air-impermeable material to form a simple ribbed shelf U■.

The ceiling duct plate (3) and the cold air outlet of the cold air suita material Q7+ each blow out six air substantially vertically downward.

In addition, by disposing the auxiliary duct plate αNr and the upper outer wall of the showcase body (1) at a predetermined interval, the showcase body ( 1) Form an outside air introduction duct αS from the upper part to the outside air outlet αGK formed at the upper port I#, and introduce outside air into the outside air introduction duct) O5 and into the outside air introduction duct) QS. The outside air is disposed in the blower α3' which blows out the air from the outside air outlet αe.

The outside air blower has a width equivalent to the width in the lateral direction of the cold air suction port (9), and blows outside air toward the cold air suction port (9).

The device according to the present invention is configured as described above.

In the device configured as described above, by operating the blower αG and the cooler aυ, cold air is sucked in from the cold air suction port (9) as shown by the arrow mark.
The fact that the air is cooled by υ and blown out into the cold air circulation duct (7) is exactly the same as in the conventional example. The cold air circulation duct (
7) Some of the cold air blown into the ceiling duct board (3)
The air is blown out generally vertically downward as shown by the arrow C, and a part of the air is blown out generally vertically downward as shown by the arrow from the bottom surface of the product placement jM (I3. The above-mentioned ceiling duct)
& f3+ and the cold air blown out from the bottom of the product shelf α directly cools the entire interior of the product storage chamber (6), and at the same time, air curtain B is applied to the product loading/unloading opening (2).
The cold air is sucked in from the cold air suction port (9) and circulated repeatedly to maintain the product storage chamber (6) at a desired temperature. In addition, by operating the front outside air blower, the ambient air that has been fed in as shown by arrow E is blown out through the outside air introduction duct α9 to the outside air outlet Oe in parallel to the air curtain B. Ru.

Next, the air curtain configuration V% due to misfire 8A will be explained with reference to FIG. 2H and FIG. 4. Due to the uninvented air curtain configuration, the ceiling duct) is designed to project from the bottom of the board T3+ and the product shelf α.
It has a much larger blowing area than the cold air blowing outlet (8)K of the conventional example. As a result, when the air curtain wind *1 is the same, the blowing wind speed is reduced compared to the conventional example, and it is possible to have a very low speed air curtain configuration, and one ambient air is blown out in parallel to the air curtain B. To let you.

The speed difference between the ambient air and the air curtain wind speed as described above is greatly reduced. In addition, since the blowout area is large, even if the air curtain wind ilt'Ik is increased, the amount of change in the blowout wind speed is very small, and as a result, as shown by the dashed line (a) in It has the characteristic that the amount of outside air infiltration hardly changes even if the air curtain air volume is increased.

To give an example, air curtain style 11k (h to 02
Even if the temperature is increased to , the outside air intrusion lid can be reduced from gl to g2, and the internal temperature can be reduced from T1 to T2, and the blowout temperature can be increased from tl to t2Vc.

In the above embodiment, all (3) of the ceiling duct plate (3) and the product shelf Q? The structure is such that the cold air is blown out from the entire bottom surface of J, but it may be blown out in one part, or the cold air is blown out from the bottom (8) of all the product placement shelves. but.

Almost the same effect can be obtained even if the air is blown out from the lower surface of one shelf (for example, only from the central shelf).

Further, according to the embodiment of the present invention, in order to effectively utilize the space of the product storage chamber (6), the product placement shelf σ2 and the cold air blowing member Q3 are integrated, and both are formed separately. Also, in this case,? @The air blowing member I is composed of a hollow pipe body having a cold air blowing outlet on the lower side, and is arranged at regular intervals through several Vcvl lines P9r in the lateral direction of the product storage chamber (6). ), and in this case, a cold air blowing member α3 is also provided.

It may also be used as a support member for the product shelf α2.

As described above, according to the present invention, the outside air intrusion is kept to a low level compared to the conventional air curtain, and the heat load on the showcase can be reduced. Since there is almost no shadow*1 depending on the air volume, it is possible to increase the air curtain style t't-. As a result, this Dan Oven Showcase saves energy, and at the same time, the temperature inside the oven is reduced.

And by directly cooling the stored products with cold air,
The stored products can be uniformly cooled over the entire area in the product storage chamber, thereby eliminating product loss due to partial overcooling or insufficient cooling of the products. Furthermore, as mentioned above, by increasing the air curtain Xtt, the blowing air temperature can be raised, so the cooler temperature
can be increased, the efficiency of the refrigerator can be improved, and further energy savings can be achieved.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional oven showcase, Figure 2 is a characteristic diagram showing the relationship between air curtain air volume and internal temperature range in an open showcase, and Figure 3 is a diagram showing the air curtain air volume in an open showcase. FIG. 4 is a characteristic diagram showing the relationship between air curtain island 5 and the outside air inlet lid in an open showcase. FIG. FIG. 3 is a cross-sectional side view of the open showcase. Also, is the 10J- symbol in the figure the corresponding part? (1) is the oven showcase body, and (2) is the opening for putting in and taking out products. (3) is the ceiling duct plate, (4)ii is the rear duct plate, (5)
) is the bottom (3) duct plate, (6) is the product storage chamber, and (7) is the cold air circulation duct. (9) is the cold air intake port, (II is the blower, αD is the cooler, 03 is the product shelf, (lS is the blower, 04 is the auxiliary duct plate, O9 is the outside air introduction duct, - is the outside air outlet,
+171 is a cold air blowing member. Agent Makoto Kuzuno - Figure 1? "Mutual side" IILIL and procedural amendments (methods) Commissioner of the Japan Patent Office 1 Display of the case Japanese Patent Application No. 57-75720 2 Name of the invention Open showcase 3 Relationship with the case of the person making the amendment VF revision applicant's residence Address: 2-6-2 Otemachi, Chiyoda-ku, Tokyo Name (442) Nippon Kentetsu Co., Ltd. (1 other person) Representative: Masahiko Yoshitake 4 Agents Address: Mitsubishi Electric, 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Inside the corporation 6, Drawings subject to amendment 7, Contents of amendment

Claims (1)

[Scope of Claims] (11) A showcase main body whose front surface is open and which has a cold air suction port at the lower FMI on the open side; ) 41, a rear duct plate disposed at a predetermined interval from the rear inner wall of the showcase body, and a bottom duct disposed at a predetermined interval from the bottom inner wall of the showcase body. With a board? The interior of the showcase main body is divided into a product storage chamber and a cold air #i ring duct which is delayed to the cold air suction port by the ceiling duct plate, rear duct plate, and bottom duct 8IVc, and a front product storage chamber. In the oven showcase, the ceiling duct 1 is provided with a shelf for placing products therein, and a blower and a cooler are provided in the cold air circulation duct. A cold air outlet that forms an outside air outlet that blows cold air downward and also blows cold air downward into the product storage chamber? A hollow cold air blowing member having,
The hollow space is connected to the cold air circulation duct and is provided in a substantially horizontal direction, and an outside air outlet is formed at the upper opening edge of the showcase body to blow out outside air toward the cold air suction port. An outside air introduction duct communicating with the air outlet is arranged outside the showcase body. The oven showcase is further provided with a blower that blows outside air through the outside air introduction duct and from the outside air outlet. (2) %IF! The cool air outlet of the ceiling duct plate is segmented and formed almost over the entire surface of the ceiling duct plate! Oven showcase 1 described in item (1) (31N air blowing member is provided throughout the horizontal interior #1 of the product storage chamber, and the cold air blowing member of the cold air blowing member) The oven showcase according to claim 11 or claim 2, characterized in that the air outlet is formed by segmenting the entire lower part of the cold air blowing member. 4) The cold air blowing member is provided in series over the entire lateral free space of the product storage chamber, and the lower surface of the cold air blowing member is formed with subdivided cold air blowing ports over the entire width. , an open showcase according to claim 1 or 2, characterized in that the upper surface is a product etI?I. (5) The outside air introduction duct and the outer wall surface of the showcase body. The open showcase according to any one of claims (1) to (4), characterized in that the outside air introduction duct is formed between the upper surface of the showcase body and The open showcase according to any one of claims (1) to (5), characterized in that it is disposed outside the exterior.