JPH01102279A - Refrigerated open counter - Google Patents

Abstract

PURPOSE: To keep the internal temp. variation min. and save the energy by controlling the CA flow rate so as to keep the internal temp. const. against the change of the outside air temp. or blow-off/suction opening temp. of cold air, thereby keeping the GA flow rate always less than the CA flow rate. CONSTITUTION: According to predetermined programs with input of a temp. detected by an outside air temp. sensor 17, a cold air(CA) flow rate changer 18 and guard air(GA) flow rate changer 19 are controlled to control the rotation of a CA fan 5 and GA fan 7. A program is set in a microcomputer controller 20 for determining the CA and GA flow rates within a predetermined outside air temp. range according to the set value of the internal temp. variation ΔT. The microcomputer controller 20 compares and judges the detected value signal of the outside air temp. sensor 17 with a set signal of the CA flow rate adjustment and controls the CA flow rate through the CA flow rate changer 18 and GA flow rate according to the CA flow rate variation so that the CA flow rate WCA > the GA flow rate WGA always.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to an improvement in a refrigerated open showcase.

[Conventional technology]

FIG. 4 is a longitudinal cross-sectional view showing a conventional two-layer air curtain type refrigerated open showcase. A duct plate installed inside the insulating wall (3), this duct plate fiυ and the insulating wall +3
A partition plate (91) separates the space between the cold air circulation duct (
It is divided into C61 (hereinafter referred to as the eA circulation duct) and a protective airflow circulation duct (hereinafter referred to as the GA circulation duct) (8). In the CA circulation duct (61) there is a cooler 14+ and a cold air circulation fan (hereinafter referred to as CA fan) (51).

A protective airflow circulation fan (hereinafter referred to as GA fan) (7) is provided in the GA circulation duct (GA circulation duct) +81.

ut+nz is a cold air outlet (hereinafter referred to as CAA outlet) and a protective upper airflow outlet (hereinafter referred to as GAA outlet) provided at the upper end of the opening (2), and fi3fi41 is a cold air intake provided at the lower end of the opening +21. (hereinafter referred to as CAA inlet), protective air intake (hereinafter referred to as GAA inlet)
and are in communication with the CA circulation duct (8) and the GAA circulation duct (8), respectively. (L!il is a product display room, in which a plurality of product display shelves fi6 are arranged.

Next, the operation of the conventional device shown in FIG. 4 will be explained.

CA circulation duct) 16+, GAA ring duct (cooler installed in 81 +41 and CA fan +51.G
When the A fan (7) is fully operated, the CA
Air flows A and B pass through the A ring duct [6] and the GAA ring duct (8), respectively, and the CAA outlet α1
1. From GA outlet nz to CA inlet fi:l, G
A two-layer CA air curtain A' and a GA air curtain Blyt are formed at the front opening (21) of the showcase body (1) toward the A suction port. Of these, the CA air curtain A' is used for cooling. It is a low-temperature cold air curtain cooled by a container +41.

Furthermore, the GA air curtain B' is a protective airflow air curtain that is blown out and formed on the outside of the CA air curtain A' to prevent outside air from being drawn into the CA air curtain A/. These two layers of air curtains A' and B', inside and outside, transfer heat from the outside air to the product display room a! Block intrusion into IL.

The products arranged on the product display shelf we are held together. In addition.

The CA fan and GA fan are configured to send out a constant amount of wind t.

By the way, there are variations in CAA air output volume and internal temperature.

As shown in Figure 3, the relationship between showcase refrigeration capacity and outside temperature increases as the CAA airflow increases.

The required refrigerating capacity Q increases, and conversely, the variation ΔT in the internal temperature decreases. Further, when the CA blowout air volume is set to 't-- constant, as the outside temperature decreases, the required refrigerating capacity Q and the variation ΔT in the internal temperature also decrease.

Of course, in order to maintain the freshness of stored products, it is desirable to keep the variation in internal temperature below a certain value.

[Problem that the invention seeks to solve]

(Conventional refrigerated open showcases are configured to blow air at a constant air volume as described above.2 For example, as shown in Figure 3, in order to reduce the variation in internal temperature to Δt25 or less, Considering the summer conditions, it is necessary to design CAUf with a high value of Wl, but at this time, even during light loads such as mid-season or winter, the CA air volume should not be operated at Wl, and the CA should be designed with a higher value than necessary. For example, if the outside temperature changes from 25℃ to 2
When the temperature drops to 0°C, the necessary internal temperature variation conditions Δt25 and υ are also sufficient conditions Δt20 to maintain product freshness.
Therefore, there is a problem in that extra power is consumed, which is not desirable in terms of energy conservation.

This invention was made to solve the above-mentioned problems, and aims to provide an open refrigerated showcase that can maintain the internal temperature variation to the necessary minimum, maintain the freshness of products, and save energy. purpose.

[Means for solving problems]

The open showcase according to the present invention includes a temperature sensor, a CA-GAA amount variable device, a microcomputer controller,
Controls the amount of CAR according to changes in the temperature of the outside air, outlet, or inlet.

The relationship between CA air volume WCA and GA air volume WGA is always WCA
> WGA, the GA air volume is controlled.

[Function] The open showcase of the present invention uses a 4 degree sensor to detect the outside air temperature or the temperature of the cold air outlet and suction port, and controls the CA air volume by a microcomputer controller according to the detected temperature. G
Since the air volume A is controlled by a microcomputer, the protective airflow reliably prevents cold air from leaking to the outside, making it possible to maintain the internal temperature variation within a predetermined direction while realizing energy savings.

[Embodiments of the invention]

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

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the present invention.
In FIG. 1 (11 to ae are the same as the conventional example shown in FIG. 4, their explanations are omitted.
is CAJi! Lf variable device, +19 is a GAI ill amount variable device. ■ is a microcomputer controller that inputs the detected temperature of the outside air temperature sensor surface, and according to a predetermined program, the CA air volume variable device + 18. The GA air volume variable device a9 is controlled and the CA fan +51. Controls the rotation of the GA fan (7). In addition, air volume variable device +181
．． fi9 can be realized by known means such as an inverter or two-phase control.

The microcomputer controller ■ has a flowchart in Figure 2 that shows how much CAjti and GA air volume should be set when the outside temperature is between low and high, depending on how much the internal temperature variation Δt is set. The program shown in is set up.

Note that "Outside temperature 25°C?" in the flowchart indicates that the outside temperature t is in the range of 25°C≧t>20°C.

Next, the operation of the apparatus of this invention will be explained.

Compare and judge the detected value signal of the outside air temperature sensor +lη and the CA air volume adjustment setting signal using the microcomputer controller ■.

The CA air volume is controlled by the CA air volume variable device aS.

Also, this 1115. CA air volume WCA and GA air volume W
So that the relationship of GA is always WcA>WGA,
The GA air volume is controlled according to changes in the CA air volume.

A specific control method will be described below with reference to FIGS. 2 and 3.

When the internal temperature variation is set to Δt25, if the outside temperature is 25°C, the CA air volume is set to Wl (Figure 3 A).The CA fan (51) is controlled.The GA air volume at this time is as shown in Figure 2. The air flow rate is controlled to be smaller than the CA air volume W1 as shown in FIG.

Although this control is performed, when the outside temperature drops to 20° C., the CA air volume is controlled to be reduced to W2 (FIG. 3A) so that the internal temperature variation Δt25 does not change. At this time, the GA air volume is CA air volume W2 as shown in Figure 2.
It is controlled to be smaller, that is, as CA decreases, GA also decreases.

In addition, when the outside temperature drops from 25℃ to 20℃.

If the CA air volume is not changed, the internal temperature variation will be Δt2
0 (Fig. 3), the internal temperature variation is reduced more than necessary to maintain freshness, and the required refrigerating capacity Q also becomes Q.
It only decreases from 25 (Figure 3) to Q20 (Figure 3).

However, if the CA air volume is changed so that it remains constant at the condition Δt25 required for freshness control as shown in Figure 3A, the required refrigerating capacity Q becomes Q20' (Figure 3).

You can save energy for just 60 minutes.

In addition, in the above embodiment, the ficA-GA air volume was controlled based on the outside temperature, but the desired purpose can also be achieved by controlling the υCA-GA air volume based on the temperature difference between the CA outlet and the CA suction port. .

〔Effect of the invention〕

As described above, according to the present invention, the CA air volume is controlled so as to keep the variation in internal temperature constant against changes in outside air temperature, cold air blowout, and suction port temperature, and
Since the GA air volume is always controlled to be smaller than the CA air volume, there is less leakage of cold air to the outside, and the internal temperature variation is not reduced more than necessary, ensuring the desired freshness of products. It has the effect of being able to measure energy savings.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a refrigerated open showcase according to an embodiment of the present invention, Fig. 2 is a flowchart showing an example of the control contents of the microcomputer, Fig. 3 is an enlarged view of the air curtain outlet, and Fig. 4 FIG. 2 is a characteristic diagram showing the required refrigerating capacity and internal temperature variation control of the refrigerated open showcase according to an embodiment of the present invention. FIG. 5 is a longitudinal sectional view of a conventional open showcase. (1) is the showcase body, C2) is the front opening, (3)
is the insulation wall, (41 is the cooler, (5: is the CA fan, (6 is
) is CA circulation duct, (7) is GA fan, (81 is G
A circulation duct. (91 is the partition plate, rlo is the duct plate, aυ is the CA outlet, 112 is the GA outlet, fi3 is the CA inlet, t141 is the GA inlet. a9 is the product display room, 1G is the product display shelf, αη is the outside air Temperature sensor, fia is CA air volume variable device, (I9 is GA
Air volume variable device, ■ is a microcomputer controller. Note that the same symbols in the mouth indicate the same or equivalent parts. 1t519 ZU '6 5: CA fan - 36: CA 10; 14: GA suction port 15: Parts lower row 31 I6: Takacho J East Row shelf 17: Outside temperature skin sensor 18: CA air flow rate available 19: GA air flow rate available 20: Microcomputer (N'l@Taku Figure 2 Figure 3 WJ CA Baakaze! Figure 4 Figure 5 Diagram A': CA Completed Curtain B''-GA Air Curtain Procedure Amendment 1. Indication of the incident Patent Application No. 1982-261159 2, Name of the invention Refrigerated open showcase 3, Representative of the person making the amendment South Exit Kanbe 4 , Agent 6, "Detailed Description of the Invention" column, "Brief Description of Drawings" column, and drawings of the specification subject to amendment. 7. Contents of amendment (1) Page 2, line 15 of the specification Let r(8) be ``(8
) Toni” is corrected. (2) "Predetermined surface" on page 6, line 16 of the specification is "predetermined value"
and correct it. (3) Lines 7 to 11 of page 10 of the specification are amended as follows. [Required refrigeration capacity of refrigerated open showcase according to an embodiment of the present invention, variation control characteristic diagram of internal temperature, 4th
The figure is a longitudinal sectional view of a conventional open showcase, and FIG. 5 is an enlarged view of the air curtain outlet. J(4) Figure 1 of the drawings shall be amended as shown in the attached sheet. (Correction of code 18 to 19 and 19 to 18) (5) Figure 2 of the drawings is corrected as shown in the attached sheet. (3) Correct the difference between Figure 3 of the drawing and the attached sheet. (Q20
(corrected to 020') Fig. 1 6 s: cA fan-36: cA4 Yukan Dalit 10; daku) Main character 4 il: CAU missing port 12: GA Kasumi port 13: CAO entry port 14: GA suction port 15: Rinjin Gejou Line 16: Yakumochi Sento Tari Shelf i7: Iy) Temperature Sensor 18: CA Quantity Capable 19: GA Quantity Capable Capacity 20: Microcomputer '$']@叉Ran Figure 2 Figure 3

Claims (1)

[Claims] (1) A cold air circulation duct that includes a partition plate between the insulating box that makes up the outer box of the open front open showcase body and the duct plate that makes up the inner box, and houses a cooler and a cold air circulation fan; and a protective air circulation duct that accommodates a protective air circulation fan, and each duct blows out two layers of air curtains, inside and outside, toward the front opening of the case body to keep products displayed inside the refrigerator cool. In the showcase, explain the temperature sensor that detects the outside air temperature or the temperature of the cold air outlet and inlet, the cold air volume variable device, the protective air volume variable device, and the microcomputer controller. The amount of cold air in the cold air circulation duct is controlled to keep the variation in internal temperature constant, and the relationship between the amount of cold air W_C_A and the amount of protective air W_G_A is always W_C_A>W_G_
A refrigerated open showcase characterized in that the volume of protective airflow is controlled so that A.