JPS63231179A - Cold open counter - 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 [Field of Industrial Application] The present invention relates to a refrigerated open showcase for displaying and selling products that require refrigeration.

[Conventional technology]

Figure 5 shows the general structure of a refrigerated open showcase.The front side of the main body (1) formed of a heat insulating wall is an opening (2) for entering and exiting products, and the interior of the main body (1) is a duct plate ( 3
) partition, product display room (4) and cold air circulation duct (5)
It is divided into two parts.

A blower (6) and a cooler (7) are disposed in the cold air circulation path (5), and
The respective ends thereof serve as an outlet (8) and an inlet (9) facing the upper and lower ends of the opening (2) for entering and exiting the product. In the figure (10
) indicates a product shelf provided in multiple stages in the product display room (4).

Figure 6 shows the control circuit of the cooler (7), where the inflow refrigerant pipe includes a solenoid valve (11) and a thermostatic automatic expansion valve (11).
2), and the outflow refrigerant pipe is provided with a temperature sensor (12a) that sends an output to the thermostatic automatic expansion valve (12).

In this way, the cold air sucked in from the suction port (9) by the blower (6) is cooled by the cooler (7), passes through the cold air circulation path (5), and is blown out from the air outlet (8). Forms a cold air curtain. This cold air curtain closes the opening (2) and cools the inside of the product display room (4) to a desired temperature, and is sucked in through the suction port (9) again to repeat the circulation.

On the other hand, the solenoid valve (11) controls the internal temperature (the product display room (4)
) is used to adjust the temperature inside the refrigerator, and is normally controlled by the number i of the thermostat (not shown) installed inside the refrigerator.
The temperature inside the refrigerator is maintained within a certain range by controlling the OFF state to cut off the flow of refrigerant. Also, the expansion valve (12
) controls the flow rate of the refrigerant based on the signal from the temperature sensor (12a) so that the superheat at the refrigerant outlet of the cooler (7) is constant.

By the way, open showcases configured in this way are usually installed in food stores, and due to their advantages such as good production efficiency, they have become larger, and the thick ones have a width of about 3.6 mm.
m is also produced.

Further, this type of open showcase is usually specially designed for each temperature according to the appropriate storage temperature of the products to be displayed.

[Problem that the invention seeks to solve]

All of the conventional open showcases, even those with large widths, must be used at the same temperature.

Additionally, as mentioned above, conventional syzzy 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, you will need to set the thermostat higher. However, in this case, since the designed cooling capacity is large, the opening time of the solenoid valve becomes short, and as shown in FIG. 4, the problem arises that the ON-OFF frequency increases and the life of the equipment is shortened.

In addition, as a means to compensate for such shortcomings, Japanese Patent Application Laid-Open No. 1986-
61566 (Japanese Patent Application No. 54-138123), the heat exchange area, fin pitch, etc. of the fins of one cooler are made to differ depending on the part, and the cold air circulation path and product display room are designed accordingly. compartmentalized and different.

Those that can be used at certain temperatures are shown.

However, this publication of 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, what kind of products should be stored in which section was determined in advance, and it was not possible to freely choose the placement of the products.

The purpose of the present invention is to eliminate the disadvantages of the conventional example, and to provide a refrigerated open showcase in which one refrigerated show game can be used in different temperature zones, and the temperature of each compartment within the product display room can be freely selected. Our goal is to provide the following.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a main body having an opening for entering and exiting products on the front surface.1. A duct board is used to divide the product display room into a cold air circulation path with a blower and a cooler installed inside, and the ends of the cold air circulation path are in front of the air outlet facing the upper and lower ends of the product entry/exit opening. In a refrigerated open showcase that is formed at the opening and closes the opening surface with a cold air curtain, the cold air circulation air path is divided in the longitudinal direction by an air path partition plate, and a cooler and a blower are installed independently in each. The main idea is to divide the product display room in the longitudinal direction with internal partition plates corresponding to the divisions, and to install a temperature setting device in each division so that the coolers can be controlled individually. It is.

[Effect]

According to the present invention, the divided sections of the product display room are individually cooled by independent coolers, so that each section can have its own temperature zone. Furthermore, this temperature range can be arbitrarily selected for each section using a temperature setting device.

〔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 showcase of the present invention, and FIG. 1b is a longitudinal sectional side view of the main parts of the same.
The same reference numerals are given to the same components as in FIG. 5 showing the conventional example.

The front side of the main body (1) formed of a heat insulating wall is an opening (2) for entering and exiting products, and the interior of the main body (1) is a duct plate (
3) to partition the product display room and the cold air circulation air path, and the present invention further partitions the cold air flow Wi ring road air path in the longitudinal direction with partition plates (14a) (14b),
It was divided into cold air circulation channels (5a), (5b), and (5C). Corresponding to this division, the product display room is also partitioned in the longitudinal direction by interior partition plates (15a) and (15b), dividing the product display room into product display rooms (4a), (4b), and (4c).

And each divided cold air circulation air path (5a) (5b)
(6a) (6b) (6c) inside (5c)
and coolers (7a) (7b) (7c) are arranged independently, and the cold air circulation air passages (5a) (5b)
Each end of (5c) has a common air outlet (8) and suction port (
9), facing the upper and lower ends of the opening (2) for entering and exiting the product. (10) in the figure shows product display rooms (4a) (4b) (
4c) shows product R storage shelves provided in multiple stages.

Figure 3 is a circuit diagram of the control system, and shows the coolers (7a) (7a).
b) Install an electronic expansion valve (
16a) (16b) (16c), and a cooler inlet refrigerant temperature sensor (1
7a) (17b) (17c) and the cooler outlet refrigerant temperature sensor (18a) (1
8b) (18C) were provided, respectively.

Furthermore, as shown in Figures 1a and 1b, each product display room (4a>(4b)(4c) is equipped with an internal temperature sensor (19).
a) (19b) (19c) and a temperature setting device (20a) (20b) (20c) as a temperature setting device
) are provided respectively. This temperature setting device (20a)
(20b) As (20C), for example, a variable resistor with a manual knob can be used.

The temperature setting device (20a) (20b) (20c)
, cooler inlet refrigerant temperature sensor (17a) (17
b) (L7c), cooler outlet refrigerant temperature sensor (1
8a ) (18b ) (18c), internal temperature sensor (19a) (19b) (19c), and control drive unit of electronic expansion valve (16a) (16b) (16c) are connected to the microcomputer controller (21). .

Next, usage and operation will be explained.

The cold air sucked in from the suction port (9) is passed through the cold air circulation air path (
Coolers (7a) to (7C) installed in 5a) to (5C)
), and the cold air circulation air passages (5a) to (5
Air is blown out from the air outlet (8) through the air outlet (8) to form an air curtain in the opening (2) and also in the product display room (4a).
(4c) is cooled to a desired temperature and sucked in again through the suction port (9) to repeat the circulation.

By the way, to describe the operation of internal temperature control for the product display room (4a), the temperature setting device (20
a) Once the set temperature is determined, the internal temperature sensor (
The microcomputer controller (21) compares and judges the signal from the controller 19a) and the set value signal from the temperature setter (20a), outputs a control signal, and drives the electronic expansion valve (16a). On the other hand, the signals from the cooler inlet refrigerant temperature sensor (17a) and the cooler outlet refrigerant temperature sensor (18, 8) are used to determine the superheat of the cooler outlet refrigerant. This is achieved by driving the electronic expansion valve (16a) in the closing direction and reducing the flow rate of the refrigerant. Conversely, in order to reduce superheat, the electronic expansion valve (16a) is driven in the opening direction to increase the flow rate of the refrigerant. That is, the microcomputer controller (21) compares the signal of the internal temperature sensor (19a) and the set value signal of the temperature setting device (20a), and if the actual internal temperature is higher than the set value, the cooling The microcomputer controller (21) receives signals from the cooler inlet refrigerant temperature sensor (17a) and the cooler outlet refrigerant temperature sensor (18b).
) calculates the superheat of the refrigerant at the outlet of the cooler, and operates the electronic expansion valve (16a) to reduce the superheat.
is driven in the opening direction. As a result, the refrigerant flow rate increases, the amount of heat exchanged by the cooler (8a) increases, and the temperature inside the refrigerator changes in the direction of cooling.

Conversely, if you want to increase the temperature inside the refrigerator, use the electronic expansion valve (1
6a) in the closing direction.

The above temperature control is the same for the product display rooms (4b) and (4c), and these can be controlled individually.

In the above example, one showcase was divided into three sections, but the number of sections can be increased or decreased as necessary.Although a single-phase air curtain was used, a protective airflow air curtain may also be included. There is no problem even in the case of a multilayer air curtain such as two or three layers.

〔Effect of the invention〕

As described above, the refrigerated open showcase of the present invention allows one refrigerated showcase to be used in different temperature zones, and the temperature zones are not predetermined and can be freely set for each section. It is easy to use because it can be selected.

[Brief explanation of drawings]

゛ Fig. 1a is a partially cutaway perspective view showing one embodiment of the refrigerated open showcase of the present invention, Fig. 1b is a longitudinal sectional side view of the main parts of the same, Fig. 2 is a cross-sectional plan view of the same, Fig. 3. 4 is a temperature control characteristic diagram in a conventional refrigerated open showcase, FIG. 5 is a longitudinal side view showing a conventional example, and FIG. 6 is a conventional control circuit diagram. (1) Main body 2) Opening for product entry and exit (3) Duct plate (4) (4a) (4b) (4c) - Product display room (5) (
5a) (5b) (5c) ...Cold air circulation duct (6)
(6a) (6b) (6c) ...Blower (7) (7a
) (7b) (7c) ... Cooler (8) ... Air outlet (9) ... Suction port (10) ... Product shelf (11) ... Solenoid valve (12) ...Temperature-type automatic expansion valve (12a) ...Temperature sensing part (14a) (14b) - ...Air passage partition plate (15a)
) (15b) -Interior partition plate (16a) (16
b) (16c) =Electronic expansion valve (17a) (
17b) (17c) - Cooler inlet refrigerant temperature sensor (18a) (18b) (18c) - Cooler outlet refrigerant temperature sensor (19a) (19b) (19c) - Inside temperature sensor (20a) (20b) (20c) ) ・
...Temperature setting device (21)...Microcomputer controller

Claims (2)

[Claims] (1) The interior of 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 with a blower and a cooler installed inside, and the end of the cold air circulation path In the refrigerated open showcase in which the air outlet and the suction port facing the upper and lower ends of the product entry/exit opening are formed and the opening surface is closed with a cold air curtain, the cold air circulation air path is formed in the longitudinal direction by an air path partition plate. A cooler and a blower are installed in each compartment, and correspondingly, the product display room is also divided in the longitudinal direction with internal partition plates, and a temperature setting device is installed in each compartment. A refrigerated open showcase characterized by individually controlling the cooler. (2) The refrigerated open showcase according to claim 1, wherein the cooler is controlled by an electronic expansion valve.