JPH0378553B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a refrigerated open show case for displaying and selling products that require refrigeration.

[Conventional technology]

Fig. 6 shows the general structure of a refrigerated open show case.The front side of a main body 1 formed by a heat insulating wall 3 is an opening 2 for entering and exiting products, and the inside of the main body 1 is partitioned by a duct plate 6 to display products. It is divided into a chamber 10 and a cold air circulation path 7.

A blower 9 and a cooler 8 are disposed in this cold air circulation passage 7, and each end of the cold air circulation passage 7 serves as an air outlet 4 and an inlet 5 at the upper end of the front opening 2. and facing the bottom edge. Reference numeral 11 in the figure indicates a product shelf provided in multiple stages in the product display room 10.

FIG. 7 shows a control circuit for the cooler 8, in which a solenoid valve 12 and a temperature-type automatic expansion valve 13 are provided in the inflow refrigerant pipe, and a temperature-type automatic expansion valve 13 is provided in the outflow refrigerant pipe. Temperature sensing section 13 that sends the output
A is provided.

In this way, the cold air sucked in from the suction port 5 by the blower 9 is cooled by the cooler 8, passes through the cold air circulation path 7, and is blown out from the outlet 4 to form a cold air curtain. This cold air curtain closes the front opening 2 and also closes the product display room 1.
0 is cooled to a desired temperature, and the air is sucked in through the suction port 5 again to repeat the circulation.

On the other hand, the solenoid valve 12 is used to adjust the temperature inside the refrigerator (temperature inside the product display room 10), and is normally controlled ON and OFF by a signal from a thermostat (not shown) installed inside the refrigerator. By blocking the flow of refrigerant, the temperature inside the refrigerator is maintained within a certain range. Further, the temperature-type automatic expansion valve 13 controls the flow rate of the refrigerant so that the superheat at the refrigerant outlet of the cooler 8 is constant based on the signal from the temperature sensor 13a.

By the way, open show cases constructed in this way are usually installed in food stores, and due to their advantages such as high production efficiency, they have become larger in size, and large cases with a width of about 3.6 m are being produced.
Further, this type of open show case is usually specially designed for each temperature range according to the appropriate storage temperature of the products to be displayed.

[Problem that the invention seeks to solve]

In the conventional open show case, even if the case is large and has a long width, the entire case must be used at the same temperature.

Additionally, as mentioned above, conventional cases are specially designed for each temperature zone, so if you try to use something designed for a low temperature zone in a high temperature zone,
The thermostat must be set at a high value, but in this case, the designed cooling capacity is large, so the opening time of the solenoid valve is shortened, as shown in Figure 5.
There is also the problem that the ON-OFF frequency increases and the lifespan of the equipment is shortened.

In order to compensate for these shortcomings, Japanese Patent Application Laid-open No. 56-64566 (Japanese Patent Application No. 138123/1982) describes a method in which the heat exchange area, fin pitch, etc. of the fins of a single cooler differ depending on the part. A device is shown in which the cold air circulation path and the product display room are divided accordingly and can be used at different temperatures.

However, the one published in Japanese Patent Application Laid-open No. 56-61566,
Since it is just a single cooler with partially different heat exchange capabilities, it is not possible to freely select the temperature inside each compartment. Therefore,
It was not possible to display products while considering the appropriate cooling temperature for each product.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide a refrigerated open case in which one refrigerated case can be used in different temperature zones and the temperature of each compartment in a product display room can be freely selected.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention divides the interior of the main body, which has an opening for entering and exiting products on the front surface, into a product display room and a cold air circulation path in which a blower and a cooler are installed. In a refrigerated open show case in which the ends of the cold air circulation air path are formed at the air outlet and suction port facing the upper and lower ends of the product inlet/outlet opening, and the opening surfaces are closed with a cold air curtain, the cold air circulation air path is formed as an air path. The product display room is divided into multiple sections in the longitudinal direction by partition plates, and independent coolers and blowers are installed in each section, and the product display room is divided in the longitudinal direction by internal partition plates in correspondence with the sections. A temperature setting device is provided, and each cooling channel is divided into multiple sections.
The gist of the present invention is to provide a solenoid valve on the inlet side of each refrigerant flow path, and to control opening and closing of the solenoid valve by the output of the temperature setting device.

[Effect]

According to the present invention, the divided sections within the product display room are individually cooled by independent coolers, so that each section can have a separate temperature zone. Furthermore, these temperature ranges can be arbitrarily selected and maintained for each section by using each temperature setting device, depending on which of the divided refrigerant channels of each cooler is used.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

Fig. 1a is a perspective view showing one embodiment of the refrigerated open shower case of the present invention, and Fig. 1b is a longitudinal cross-sectional side view of the same essential parts. .

That is, the front side of the main body 1 formed by the heat insulating wall 3 is an opening 2 for entering and exiting products, and the inside of the main body 1 is partitioned by a duct plate 6 to divide it into a product display room and a cold air circulation path. Further, this cold air circulation air passage 7 was partitioned in the longitudinal direction by air passage partition plates 14a, 14b, and the cold air circulation air passage 7 was divided into 7a, 7b, and 7c. In addition, corresponding to these divisions, the product display room is also partitioned in the longitudinal direction by interior partition plates 15a and 15b.
The product display room is divided into 10a, 10b, and 10c.

Each of the divided cold air circulation air passages 7a, 7
Blower 9a, 9b, 9c and cooler 8a, 8b, 8c are independently arranged in b, 7c, respectively,
Further, each end of the cold air circulation air passages 7a, 7b, and 7c faces the upper and lower ends of the opening 2 as a common air outlet 4 and a divided suction inlet 5. Reference numeral 11 in the figure indicates a plurality of product placement shelves provided in each of the product display rooms 10a, 10b, and 10c.

FIG. 3 is a circuit diagram of the control system, in which the cooler 8
Automatic temperature expansion valves 18a, 18b, 18c are provided on the inflow side of each refrigerant flow path to a, 8b, 8c, respectively, and temperature sensing portions 18a', 18b', 18c' of each automatic temperature expansion valve 18a, 18b, 18c are provided. is attached to the outflow side of each refrigerant flow path, and temperature sensing parts 18a', 18b',
The expansion valves 18a, 18b, 18 are activated by the signal from 18c'.
c is controlled to control the flow rate of the refrigerant so that the superheat at the refrigerant outlet portions of the coolers 8a, 8b, and 8c becomes constant.

Between the automatic temperature expansion valves 18a, 18b, 18c and the coolers 8a, 8b, 8c, that is, the refrigerant inlet side, is branched into a plurality of (two in the figure) solenoid valves 16a, 17a, 16b, 17b, 16
c and 17c are respectively arranged.

The branch path provided with this electromagnetic valve is connected to the refrigerant flow path in each cooler, and as a result, the refrigerant flow path in the cooler is divided into a plurality of sections. Note that such division may be unequal.

Furthermore, as shown in FIGS. 1a and 1b, each product display room 10a, 10b, 10c is provided with internal temperature sensors 19a, 19b, 19c and temperature setting devices 20a, 20b, 20c as temperature setting devices, respectively. . These temperature setting devices 20a, 20b, 2
As 0c, for example, a variable resistor with a manual knob can be used.

The temperature setting devices 20a, 20b, 20c, solenoid valves 16a, 16b, 16c and 17a, 17b, 1
7c, internal temperature sensor 19a, 19b, 19c
are connected to the microcomputer controller 21, respectively.

Next, usage and operation will be explained.

The cold air sucked in through the common suction port 5 is sent to coolers 8a to 8 installed in the cold air circulation channels 7a to 7c.
c, the cold air circulation air passages 7a to 7
The air is blown out from the air outlet 4 of each compartment through c, forms an air curtain in each compartment of the front opening 2, and cools each of the product display rooms 10a to 10c to a desired temperature, and is sucked in again through the common suction port 5. The cycle repeats.

By the way, the operation of the internal temperature control is
0a, when the set temperature is determined by the temperature setting device 20a by turning a knob, the microcomputer controller 21 compares and judges the signal from the internal temperature sensor 19a and the set value signal from the temperature setting device 20a. and outputs a control signal to selectively drive the solenoid valves 16a and 17a to open and close.

Figure 4 shows the operation, with diagonal lines indicating ON control.

When the temperature set value of the temperature setting device 20a is high, the solenoid valve 16a is closed, the smaller refrigerant flow path is used among the divided flow paths in the cooler 8a, and the solenoid valve 17a is closed.
Maintains an appropriate temperature range through ON-OFF control.

Also, when the temperature set value of the temperature setting device 20a is medium, the solenoid valve 17a is closed, the larger refrigerant flow path is used among the divided flow paths in the cooler 8a, and the solenoid valve 16a is turned on and off. Maintain an appropriate temperature range through control.

Also, when the temperature set value of the temperature setting device 20a is low, the solenoid valve 16a is opened and the larger refrigerant flow path of the cooler 8a is used, and the solenoid valve 17a is turned on for the smaller refrigerant flow path. OFF control maintains the appropriate temperature range.

The above temperature control is the same for the product display rooms 10b and 10c, and these can be controlled individually.

Further, although the refrigerant flow path in the cooler is divided into two, it may be divided into three or more, and even if the refrigerant flow path is divided equally depending on the purpose, it does not contradict the gist of the present invention.

In addition, in the above embodiment, one show case has three
Although we have shown an example in which the air curtain is divided into sections, the number of sections can be increased or decreased as necessary, and although it is a single-phase air curtain, in the case of a multi-layer air curtain such as two or three layers, including a protective airflow air curtain. But there's no problem.

〔Effect of the invention〕

As described above, the refrigerated open case of the present invention can be used by dividing one refrigerated case into a plurality of different temperature zones, and these temperature zones are not predetermined. Since the cooling temperature can be freely selected for each product, the appropriate cooling temperature can always be maintained for each target product, making it easy to use.

Furthermore, since the control device is not turned on and off too frequently, the equipment will not be damaged.
It has a long useful life.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing one embodiment of the refrigerated open-shock case of the present invention, Fig. 2 is a cross-sectional plan view of the same, Fig. 3 is a control circuit diagram of the above, and Fig. 4 is a temperature control chart of the same. , FIG. 5 is a temperature control characteristic diagram of a conventional refrigerated open shed case, FIG. 6 is a longitudinal sectional side view of the conventional refrigerated open shed case, and FIG. 7 is a control circuit diagram of the same. 1... Main body, 2... Front opening, 3... Heat insulation wall, 4... Air outlet, 5... Suction port, 6... Duct plate, 7, 7a, 7
b, 7c...Cold air circulation ventilation path, 8, 8a, 8b, 8
c...Cooler, 9, 9a, 9b, 9c...Blower, 1
0, 10a, 10b, 10c...Product display room, 11
...Product placement shelf, 12...Solenoid valve, 13...Temperature automatic expansion valve, 13a...Temperature sensing section, 14a, 14b...
Air path partition plate, 15a, 15b...Interior partition plate, 16
a, 16b, 16c...Solenoid valve, 17a, 17b,
17c... Solenoid valve, 18a, 18b, 18c... Automatic temperature expansion valve, 18a', 18b', 18c'... Temperature sensing section, 19a, 19b, 19c... Internal temperature sensor, 20a, 20b, 20c... Temperature setting device , 21
...Microcomputer controller.

Claims (1)

[Claims] 1 The main body, which has an opening for entering and exiting products on the front side, is divided by a duct board into a product display room and a cold air circulation path in which a blower and a cooler are installed, and the end of the cold air circulation path is used to store the products. In a refrigerated open air case in which the air outlet facing the upper and lower ends of the inlet/outlet opening is formed with the inlet and the opening surface is closed with a cold air curtain, the cold air circulation air path is divided into a plurality of sections in the longitudinal direction by air path partition plates. Each section is equipped with an independent cooler and blower, and the product display room is divided longitudinally with interior partition plates corresponding to these sections, and a temperature setting device is installed for each section. A refrigerated open case, characterized in that a refrigerant flow path in a cooler is divided into a plurality of parts, a solenoid valve is provided on the inlet side of each refrigerant flow path, and the opening and closing of the solenoid valve is controlled by the output of the temperature setting device. .