JPH01244267A - Cold storage open showcase - Google Patents

Abstract

PURPOSE:To enable an operation to be carried out without any trouble in maintaining the freshness of articles and enable energy conservation, by providing an outside air temperature sensor, an variable air quantity type blower, a storage space temperature air dispersion setter and a microcomputer controller, and controlling the quantity of a air for an air curtain according to dispersion of the outside air temperature and storage space temperature. CONSTITUTION:Cold air taken in from a blower 9 through a suction port 5 is cooled by a cooler 8, is blown off from a blow-off port 4 by passing through a cold air circulating passage 7, thereby forming an air curtain at an opening part 2 and cooling an article display chamber 10, and is again sucked in through the port 5 to be circulated repeatedly. An outside air temperature detected by an outside air temperature sensor 12 and a storage space temperature dispersion value set by a storage space temperature dispersion setter 13 are compared and judged by a microcomputer controller 15, which outputs a control signal to control the quantity of air through an air quantity varying device 14. By regulating a control of the dispersion setter 13, it is possible to select between an operation for preferentially performing freshness control with a little energy conservation and an operation for preferentially performing energy conservation with a little unstrict control of freshness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to improvements in refrigerated open showcases, and particularly relates to air volume control of air curtains.

[Conventional technology]

FIG. 4 is a vertical cross-sectional view showing a conventional open showcase. In FIG. A duct plate provided inside the wall (3) partitions the cold air circulation ventilation path (7) and the product display room (11). The provided cold air outlet (5) is a suction port provided at the lower end of the opening (2), and communicates with the cold air circulation ventilation path (7). Also, the cold air circulation ventilation path (7) A blower +9) and a cooler (8) are disposed inside the product display room aα, and a plurality of product shelves (1B) are disposed in the product display room aα.

Next, the operation of the conventional bamboo decoration will be explained. The cold air sucked in from the suction port (5) by the blower (9) is cooled by the cooler, passes through the entire cold air circulation ventilation path (7), and then flows through the air outlet (4).
) to form an air curtain at the opening (2) and cool the product display room αα to a desired temperature,
It is sucked in again from the suction port (5) and the circulation is repeated. Note that the air quality of the blower (9) is specially controlled and is configured to always send a constant amount of air.

[Problem to be solved by the invention]

Conventional refrigerated open showcases are configured so that air is blown at a constant temperature, as shown in 3 or above, so in order to keep the internal temperature variation within the predetermined range, it is necessary to maintain the most severe summer conditions. The air volume was determined with this in mind. However, during light loads such as in the middle of autumn and spring, or during winter, the control conditions become more accurate than the required internal temperature variations.

The problem was that I ended up drinking a lot more energy.

This point will be explained in detail using the graph shown in FIG.

In an open showcase, the relationship among the air flow, required cooling capacity, internal temperature variation, and 6 degrees outside air is shown in Figure 2, as the air volume increases.

The required refrigerating capacity Q increases, and conversely, the internal temperature variation Δ
It was confirmed that T becomes smaller. Also,
When the blowing air is constant, the required refrigerating capacity Q and the internal temperature variation ΔT decrease as the outside temperature decreases.

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

For this reason, 2.For example, if you are trying to reduce T to △T25 or less due to temperature fluctuations in the refrigerator, consider the summer conditions. Considering the outside temperature of 25°C, the Suita air volume is designed at Wl (point A in the diagram). In conventional equipment, the blowout gauge is designed at Wl in this way, so it is operated at Wl even when the load is light such as in the middle of the day or in winter, so when the outside temperature is, for example, 20
If the temperature drops to ℃, the internal temperature variation will be reduced to the required ΔT2. This results in a ΔT2oK that is more accurate than that (point A in the figure).

If all the conditions of ΔT25 are satisfied, the blowout air should be W2 (double dot in the figure), which means that extra refrigeration energy is used.

There was a problem in that it was not good in terms of energy conservation.

This invention aims to solve these problems by providing an open showcase that can maintain the internal temperature variation to the necessary minimum, maintain the freshness of products, and save energy. With the goal.

[Means to solve all problems]

The refrigerated open showcase according to this invention is as follows.

It is equipped with an outside air temperature sensor, a variable air volume blower, an internal temperature variation setting device, and a microcomputer controller, and is designed to control the air curtain air flow according to the settings of the outside air temperature and internal temperature variation setting device. be.

[For production]

The open showcase in this invention detects the entire outside air temperature, and controls the internal temperature using a microcomputer controller based on the detected value and the setting value of the internal temperature 1<Rat setting device. It is designed to keep all variations constant, maintain product freshness, and save energy.

[Embodiments of the invention]

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

In FIG. 1, (l) to υ are the same as in the conventional example shown in FIG. 4, so their explanations will be omitted. α2 is a temperature sensor for detecting outside air temperature, and is attached to the upper front of the showcase body. αJ is an internal temperature variation setting device whose details are shown in FIG. 3, and is attached to the upper front of the showcase body like the outside air temperature sensor Z. (14 is a variable device for controlling the air blower (9), and Kasumi is a microcomputer controller, which are installed in the machine room at the bottom separated by a heat insulating wall.

In addition, the microcomputer controller αS is programmed in advance to determine the optimal values for internal temperature variations, outside air temperature, and Suita air volume. The system is configured such that the Suita air volume is set once the outside temperature conditions and the required internal temperature variation are determined.

Next, the operation will be explained.

Cold air sucked in from the blower (9) through the suction port (5) is cooled by the cooler (8), passes through the cold air circulation passageway (7), is blown out from the air outlet (4), and is then blown into the opening (2). While forming an air curtain, the product display room αI is cooled, and the air is sucked in through the suction port (5) again to repeat the circulation. Next, I will explain the operation of wind control.

Outside air temperature detected by outside air 6 degrees sensor 0.

The microcomputer controller compares and determines the internal temperature variation setting value set by the internal temperature variation setting device.

A control signal is output, and the airflow rate is controlled by the airflow variable device I.

In other words, in Fig. 2, the variation in temperature inside the refrigerator is expressed as △T.
When maintaining freshness by keeping the temperature constant at 25.

If the outside temperature changes from 250 to 20℃, the wind ikW
A control signal is output to the microcomputer controller O5 so as to control from W2 to W2.

At this time, if the wind mw,' is not changed, the internal temperature variation will be ΔT, which will make the internal temperature variation smaller than necessary in order to maintain freshness, and the refrigerating capacity will also be Q2o.

However, if the condition ΔT25 - constant, which is necessary for total freshness control, is changed to W2, the freezing capacity becomes Q2° and 1
．． You can save energy for just 60 minutes.

In addition, if you want to give priority to energy saving "f" over freshness management and achieve large energy savings, for example, the setting value of the refrigerator temperature irritability setting device α may be set to 25° for all ΔT.

At this time, a control signal is output from the microcomputer controller (L!19) to the air volume variable device I so that when the outside air temperature is 25°C, the airflow is fteW°, and when the outside air temperature is 2QC, the airflow is W''. In this case.

When the outside temperature is 25℃, the required refrigerating capacity is Q2. From Q25
When the outside temperature is 20°C, the values will change to Q2o-+Q2o. Therefore, when the outside temperature is 20° C., energy savings can be achieved by ΔQ", which means that even greater energy savings can be achieved than when driving with a constant wind angle W1.

In this way, by adjusting the knob of the chamber temperature variation setting device (I3), you can select between giving priority to freshness management and saving a little energy, and giving priority to energy saving while giving priority to freshness management. be able to.

In the above embodiment, the air flow control device α is used as the air volume control, but specifically, there is an inverter control 9 phase control, etc., and any of these methods can achieve the object of the present invention. .

In addition, although the internal temperature variation setting device is designed to be able to set linearly, there is no problem in setting the temperature in two or more steps using a QN-0FF switch or the like.

〔Effect of the invention〕

As described above, according to the present invention, the air volume of the air curtain is controlled so as to keep the variation in the temperature inside the refrigerator constant, so that the variation in the temperature inside the refrigerator is not reduced more than necessary, and the product can be It has the effect of maintaining freshness and saving energy.

In addition, it is now possible to set the temperature variation inside the refrigerator.

It can also be used in cases where energy saving is prioritized over maintaining freshness, and in such cases, even greater energy savings can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an open showcase according to an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the relationship between the required refrigerating capacity, the variation in internal temperature, and the outside temperature with respect to the airflow volume, and Fig. 3 is FIG. 4, which is a diagram schematically showing the internal temperature variation setting device, is a longitudinal sectional view of a conventional open showcase. In the figure, (1) is the main body of the showcase, (2) is the front opening, (3) is the insulation wall, (4) is the air outlet, (5) is the suction port, (6) is the duct plate, (7) is a cold air circulation ventilation duct, (8)
is a cooler, 19) is a blower, αQ is a product display room, tll
) is the product shelf, H is the outside air temperature sensor, α-Furu is the internal temperature variation setting device, (14) is the Kazahamachi change device, a! 9
is a microcomputer controller. Note that the same reference numerals in Figure 9 indicate the same or equivalent parts.

Claims (1)

[Claims] The main body is composed of an insulating wall that forms an opening for loading and unloading products on the front side, and a duct plate provided inside the insulating wall partitions a cold air circulation ventilation path and a product display room, and inside the cold air circulation ventilation path. A refrigerated open showcase is equipped with a blower and a cooler, and the upper and lower ends of the front opening face the outlet and inlet of the cold air circulation path, respectively. It is equipped with an internal temperature variation setting device and a microcomputer controller, and the optimum air volume according to the outside air temperature and the set value of the internal temperature variation setting device is preset in the microcomputer controller, and the outside air temperature is A refrigerated open showcase characterized in that the air volume is varied according to the detected value of a sensor and the set value of an internal temperature variation setting device.