JPH0543952B2 - - 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]

Figure 8 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 with 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. Further, reference numeral 11 in the figure indicates a product shelf provided in multiple stages in the product display room 10.

FIG. 9 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 the temperature-type automatic expansion valve 13 is provided in the outflow refrigerant pipe. 13 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/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 configured in this way are usually installed in food stores, etc., and are becoming larger due to their advantages such as high production efficiency.
Large ones with a width of about 3.6 meters are also manufactured. 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 case mentioned above,
Even if the product is large and has a long width, the entire product 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 7.
There also arises 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. 56-61566 (Japanese Patent Application No. 138123-1983) 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 for each section and the temperature of each section in a product display room can be selected.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has a main body with an opening for entering and exiting products on the front side, a product display room with a duct board, and a refrigerator with a blower and a cooler inside. A refrigerated open refrigerator partitioned into an air circulation air path, the ends of the cold air circulation air path are formed into an air outlet and a suction port facing the upper and lower ends of the product entry/exit opening, and the opening surface is closed with a cold air curtain. In this system, the cold air circulation air path is divided into multiple sections in the longitudinal direction using air path partition plates, and independent coolers and blowers are installed in each section. A temperature setting device is provided for each section, and each cooler in the same section is provided with a solenoid valve on the inlet side of the refrigerant flow path, and the solenoid valve is opened and closed by the output of the temperature setting device. The gist of this is to control.

[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, by selecting which of the plurality of coolers in each section to use using each temperature setting device, a desired cooling temperature range can be set for each section.

〔Example〕

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

FIG. 1 is a perspective view showing one embodiment of the refrigerated open-shock case of the present invention, and FIG. 2 is a longitudinal sectional side view of the main parts of the same, and the same components as in FIG. 8 showing the conventional example have the same reference numerals. .

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.

As shown in FIG. 3, each of the divided cold air circulation channels 7a, 7b, 7c has a plurality of large and small coolers 81a, 82a, 81b, 82b,
A set of 81c and 82c was installed.

The magnitude of the cooling is determined by the size of the fins or the fineness of the fin pitch; a large cooler has a large cooling capacity, and a small cooler has a small cooling capacity.

Further, the divided cold air circulation air passages 7a, 7
B, 7c are provided with blowers 9a, 9b, 9c, but if large and small coolers are arranged one after the other as if one cooler was divided, one blower should be installed in each compartment. That's fine.

On the other hand, each end of the cold air circulation air passages 7a, 7b, and 7c faces the upper and lower ends of the front opening 2 as a common air outlet 4 and a divided suction inlet 5.

11 in the figure indicates product display rooms 10a, 10b, 10
Product placement shelves provided in multiple stages are shown in c.

The entire control system is shown in Figure 5, and each cooler 8
1a, 82a, 81b, 82b, 81c, 82c
Solenoid valves 16a, 17a,
16b, 17b, 16c, and 17c are provided, respectively.

In addition, each cooler 81a and 82a, 81b and 82
Automatic temperature expansion valves 18a, 18b, 18c are provided in the common inflow path of the refrigerant channels b, 81c and 82c, respectively, and each automatic temperature expansion valve 18a, 18b, 1
The temperature sensing parts 18a', 18b', 18c' of 8c are attached to the common outflow path of the refrigerant flow path, and the temperature sensing parts 18a', 18c'
Expansion valves 18a and 18 are activated by signals from 18b' and 18c'.
b, 18c to control the flow rate of the refrigerant so that the spur heat at the refrigerant outlet portions of the coolers 8a, 8b, 8c becomes constant.

Furthermore, as shown in FIGS. 1 and 2, internal temperature sensors 19a, 19b, 19c and temperature setting devices 20a, 20b, 20c are installed in each product display room 10a, 10b, 10c. Provide each. 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 passed through coolers 81a to 81a installed in the cold air circulation channels 7a to 7c.
81c, 82a to 82c, and is blown out from the air outlet 4 of each compartment through the cold air circulation channels 7a to 7c, forming an air curtain in each compartment of the front opening 2, and each product display room 1.
0a to 10c are cooled to a desired temperature and sucked in again through the common suction port 5, and the circulation is repeated.

By the way, the operation of the internal temperature control is
Regarding 0a, when the set temperature is determined by the temperature setting device 20a by turning a knob, etc., the microcomputer controller 21 compares and determines the signal from the internal temperature sensor 19a and the set value signal from the temperature setting device 20a, and controls the temperature. A signal is output, and the solenoid valves 16a and 17a are selectively driven to open and close.

FIG. 6 shows the operation, with diagonal lines indicating ON control.

Since the solenoid valve 16a is provided in the refrigerant flow path of the large cooler 81a, and the solenoid valve 17a is provided in the refrigerant flow path of the small cooler 82a, the temperature setting device 20a
When the temperature set value is high, the output closes the solenoid valve 16a via the microcomputer controller 21, and the cooler 8
An appropriate temperature range is maintained by using only the solenoid valve 2a and controlling the solenoid valve 17a on and off.

Also, when the temperature set value of the temperature setting device 20a is medium, the solenoid valve 17a is closed and the coolers 81a, 8
A suitable temperature range is maintained by controlling the solenoid valve 46a on and off using the larger one 81a among the two.

When the temperature setting value of the temperature setting device 20a is lower, the solenoid valve 16a is opened and the cooler 81a is used continuously, and the cooler 82a is also used intermittently by controlling the solenoid valve 17a ON-OFF. This maintains an appropriate temperature range.

The above temperature control is carried out in the divided product display room 10.
The same applies to b and 10c, and these can be controlled individually.

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, it can also be used in the case of multiple air curtains such as two or three layers, including a protective airflow air curtain. There's no problem.

It is also conceivable to use three or more types of coolers for different sizes in one section.

[Effects 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 fixed in advance. Since several stages can be selected for each section, 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 longitudinal sectional side view of the main parts of the same, and FIG. 3 is a cross-sectional plan view of the same.
Figure 4 is an explanatory diagram of the cooler, Figure 5 is a control circuit diagram,
Fig. 6 is an explanatory diagram of temperature control operation, Fig. 7 is a temperature control characteristic diagram of a conventional refrigerated open shed case, Fig. 8 is a longitudinal cross-sectional side view of a conventional refrigerated open shed case, and Fig. 9 is a control circuit diagram of the same as above. It is. 1...Main body, 2...Front opening, 3...Insulation wall,
4...Air outlet, 5...Suction port, 6...Duct plate,
7, 7a, 7b, 7c...cold air circulation air path, 8,
81a, 82a, 81b, 81b, 81c, 82
c... Cooler, 9, 9a, 9b, 9c... Blower, 10, 10a, 10b, 10c... Product display room, 11... Product shelf, 12... Solenoid valve, 13
...Temperature-type automatic expansion valve, 13a...Temperature sensing section,
14a, 14b...Air passage partition plate, 15a, 15b
...Interior partition plate, 16a, 16b, 16c...Solenoid valve, 17a, 17b, 17c...Solenoid valve, 18
a, 18b, 18c... Automatic temperature expansion valve, 18
a', 18b', 18c'...Temperature sensing section, 19a, 1
9b, 19c...Inside temperature sensor, 20a, 2
0b, 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 an air outlet and an inlet facing the upper and lower ends of an inlet/outlet opening are formed 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 multiple large and small coolers and blowers, and the product display room is divided longitudinally with interior partition plates corresponding to these sections, and a temperature setting device is provided for each section. A refrigerated oven case characterized in that each cooler in the compartment is provided with a solenoid valve on the inlet side of a refrigerant flow path, and the opening and closing of the solenoid valve is controlled by the output of the temperature setting device.