JPH07190581A - Method for controlling temperature in freezer-refrigerator type open show case - Google Patents

Abstract

PURPOSE:To increase a cold air blowing temperature when a shop is closed at night, to prevent over-cooling of products stored in a show case and further perform a positive changing of the set value of the air blowing temperature. CONSTITUTION:In a freezer and refrigerator type open show case for closing an opening 2 for use in loading or unloading goods with a cold air curtain, a cold air blowing port 7 and a cold air suction port 6 are provided with temperature sensors 8 and 14. When a temperature difference between the air blowing temperature and the air suction temperature detected by these two temperature sensors 8 and 14 reaches a value less than a predetermined value, a set temperature of a temperature adjusting device 10 for controlling ON or OFF of a cooling device 9 is increased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the temperature inside a freezer-refrigerating open showcase.

[0002]

2. Description of the Related Art As is well known, a freezer-refrigerating open showcase has an opening 2 for putting products in and out, as shown in FIG. 4, and a duct inside the showcase body 1 formed of a heat insulating wall. It is divided into a product storage 4 and a cold air circulation duct 5 by a plate 3, a cooler 9 is arranged in the cold air circulation duct 5, the lower end of the cool air circulation duct 5 is an air inlet 6, and the upper end is a cool air. A cool air curtain is formed at the air outlet 7 and cold air blown out from the air outlet 7 forms a cool air curtain at the opening 2 to cool the inside of the product storage 4 and prevent outside air from entering the storage.

In this case, a temperature sensor 8 for detecting the temperature of the cool air blown to the outlet 7 is provided, and a temperature controller 10 for setting the temperature of the cool air blown to the cooler 9 is connected and detected by the temperature sensor 8. On / off of the cooler 9 is controlled by a separately installed control device so that the temperature of the cold air blown out becomes the temperature set in the temperature controller 10.

When the store is closed at night or the like, the night cover 11, which is wound and stored above the opening 2, is pulled down to prevent outside air from entering the inside of the refrigerator. Reference numeral 12 in the figure denotes an illuminating lamp such as a fluorescent lamp that illuminates the inside of the store attached to the lower surface of the display rack 13 for the products installed in the store 4.
2 goes off at night.

[0005]

As described above, when the store is closed at night or the like, not only the lamp 12 is turned off, but also the night cover 11 closes the opening 2 and, in a supermarket or the like where a showcase is installed, a person is not allowed to do so. Since the air does not come in and out and the outside air temperature becomes low, blowing cold air at the same blowing temperature as during the day may cause the goods in the refrigerator to be too cold and the quality of the goods to deteriorate.

An object of the present invention is to eliminate the disadvantages of the conventional example and to raise the set value of the blowing temperature of cold air at the time of closing the store at night to prevent the products in the refrigerator from being over-cooled and to set the blowing temperature. An object of the present invention is to provide a temperature control method for a freezer-refrigerating open showcase in which the value can be reliably changed.

[0007]

In order to achieve the above-mentioned object, the present invention provides a temperature sensor at the outlet and inlet of cold air in a freezer-refrigerating open showcase in which an opening for putting in and taking out goods is closed by a cold air curtain. And increasing the set temperature of the temperature controller for controlling the on / off of the cooler when the temperature difference between the blowout temperature and the suction temperature detected by the two temperature sensors reaches a predetermined value or less, and blowing cold air. Temperature sensors are provided at the outlet and the inlet, and the set temperature of the temperature controller that controls the on / off of the cooler when the temperature difference between the outlet temperature and the inlet temperature detected by these two temperature sensors reaches a predetermined value or less. And set the daytime set temperature range smaller than the night set temperature range, and
Switching between the daytime set temperature that controls the temperature controller and the night set temperature is linked to the on / off of the lighting inside and outside the showcase, and the daytime set temperature and night set temperature that control the temperature controller. The purpose of the switching between and is to interlock with the raising and lowering of the night cover that closes the opening for loading and unloading products at night.

[0008]

According to the present invention, the temperature difference between the blowing temperature and the suction temperature of the cold air becomes small due to the lighting of the inside of the refrigerator being turned off, the outside air temperature decreasing, and the like. When the temperature falls below the value, the set temperature of the temperature controller that controls the on / off of the cooler rises, which prevents the temperature inside the store from rising and the products inside the store from becoming too low.

According to the second aspect of the present invention, in addition to the above action, when raising the set temperature of the temperature controller, the increase range of the blowout temperature is set smaller in the daytime than in the nighttime.
Particularly, in the winter when the outside air temperature is low and the temperature difference between the blowout temperature and the suction temperature is small even in the daytime, it is possible to prevent the blowout temperature in the daytime from becoming too high and the inside temperature rising.

According to the present invention as set forth in claims 3 and 4, in addition to the above-mentioned action, switching of the increase range of the set temperature between daytime and nighttime is surely turned off at night. Since it is linked to the raising and lowering of the night cover, which is always lowered at night, the set temperature can be reliably switched between day and night.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a vertical cross-sectional side view of a freezing / refrigerating open showcase in which the temperature control method of the present invention is carried out. Since the basic configuration is the same as the conventional example already described with reference to FIG. 4,
In the drawings, the same components are designated by the same reference numerals and detailed description thereof will be omitted.

The freezer-refrigerating open showcase of the present invention also has an opening 2 for putting products in and out in the front, and the inside of the showcase main body 1 formed of a heat insulating wall is circulated with the goods storage 4 and the cold air by the duct plate 3. The cooler 9 is divided into the duct 5 and a cooler 9 is arranged in the cooler air circulation duct 5. The lower end of the cooler air duct 5 is formed as an air inlet 6 and the upper end is formed as a cool air outlet 7.

A temperature sensor 8 for detecting the temperature of the cold air blown out to the air outlet 7 is provided, and a temperature sensor 14 for detecting the temperature of the sucked air is also installed at the air inlet 6.
In addition, a temperature controller 10 for setting the temperature of the cool air blown to the cooler 9 is connected, and a separately installed control device is installed so that the temperature of the cool air detected by the temperature sensor 8 becomes the temperature set in the temperature controller 10. The on / off of the cooler 9 is controlled.

In this way, the cool air cooled by the cooler 9 is blown out from the outlet 7 to form a cool air curtain to close the opening 2 to cool the inside of the product storage 4 and at the same time the outside air is supplied from the opening 2 to the product. Prevents entry into the storage 4.
Then, the cool air that has formed the cool air curtain is sucked into the cool air circulation duct 5 through the suction port 6 while taking in the outside air, where it is cooled again by the cooler 9 and blown out from the blowing port 7.

In the freezing / refrigerating open showcase having the above structure, the present invention compares the blowout temperature detected by the temperature sensor 8 and the suction temperature detected by the temperature sensor 14 by the control device, and this temperature difference is preset in the control device. When the temperature reaches a predetermined value or less, the set temperature of the temperature controller 10 that controls the on / off of the cooler 9 is increased.

When the temperature difference between the blowout temperature and the suction temperature is less than a predetermined value, for example, the illumination lamp 12 is turned off at night or no people come in and out when the store is closed at night, and the outside air temperature becomes low. Or the night cover 11 is lowered, and the temperature inside the chamber is lowered, and the suction temperature is lowered as shown in the curve diagram of FIG. 2. As a result, the suction temperature approaches the blowout temperature, and the temperature difference is, for example, 5 ° C. The following is the case where the inside of the refrigerator is too cold.

In such a case, the set temperature set in the temperature controller 10 is increased by, for example, 2 ° C. As a result, as shown in FIG. 3, the cooler 9 is turned on and off at a higher set temperature than before, and as a result, the temperature inside the refrigerator is prevented from rising and the products in the refrigerator are prevented from being too cold.

As described above, when there is a possibility that the goods in the refrigerator are too cold, the set temperature is raised to raise the temperature inside the refrigerator. However, when the set temperature of the temperature controller 10 is raised, The increase of the blowout temperature is smaller in the daytime than in the nighttime (for example, 1 ° C increase in the daytime and 3 ° C in the nighttime).
Up). As a result, when the outside temperature is low and the temperature difference between the outlet temperature and the inlet temperature is small even in the daytime, such as in winter, when the temperature is too cold compared to at night and the outlet temperature is too high during the day, the temperature inside the warehouse rises. Can be prevented.

When the range of increase in the set temperature is changed between daytime and nighttime as described above, this changing operation is turned off by the illumination lamp 12 which is always turned off when the store is closed at nighttime, or the like.
Similarly, a night cover 1 that must be removed when the store is closed at night, etc.
By linking with the movement of 1, the set temperature can be changed reliably, and it is possible to prevent too cold at night.

[0020]

As described above, the temperature control method for the freezer-refrigerating open showcase of the present invention increases the set value of the blowing temperature of cold air at the time of closing the store such as at night to prevent over-cooling of the goods in the refrigerator. Moreover, the set value of the blowout temperature can be surely changed.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of a showcase in which a temperature control method for a freezer-refrigerating open showcase of the present invention is implemented.

FIG. 2 is a characteristic curve diagram showing changes in suction temperature and blowout temperature.

FIG. 3 is a characteristic curve diagram showing a change in set temperature for performing on / off control of a cooler.

FIG. 4 is a vertical sectional side view of a conventional freezer-refrigerating open showcase.

[Explanation of symbols]

 1 ... Showcase main body 2 ... Opening 3 ... Duct plate 4 ... Merchandise storage 5 ... Cold air circulation duct 6 ... Suction port 7 ... Air outlet 8 ... Temperature sensor 9 ... Cooler 10 ... Temperature controller 11 ... Night cover 12 ... Lighting Light 13 ... Display shelf 14 ... Temperature sensor

Claims (4)

[Claims] 1. A refrigerating / refrigerating open showcase in which a product air inlet / outlet opening is closed by a cool air curtain, and temperature sensors are provided at a cool air outlet and a cool air inlet. A temperature control method for a freezer-refrigerating open showcase, comprising increasing a set temperature of a temperature controller for controlling on / off of a cooler when a temperature difference from a suction temperature reaches a predetermined value or less. 2. A refrigerating and refrigerating open showcase in which a product air inlet / outlet opening is closed by a cool air curtain, and temperature sensors are provided at a cool air outlet and a cool air inlet. Raise the set temperature of the temperature controller that controls the on / off of the cooler when the temperature difference from the suction temperature reaches a specified value or less, and set the increase range of the daytime set temperature to be smaller than the increase range of the nighttime set temperature. A temperature control method for a freezer-refrigerating open showcase, which is characterized in that 3. The temperature control method for a freezer-refrigerating open showcase according to claim 2, wherein the switching between the daytime set temperature and the nighttime set temperature for controlling the temperature controller is interlocked with ON / OFF of the illumination lamps inside and outside the showcase. . 4. The refrigerating and refrigerating machine according to claim 2, wherein the switching between the daytime set temperature for controlling the temperature controller and the nighttime set temperature is linked with raising and lowering of a night cover that closes an opening for entering and exiting products at night. Open showcase temperature control method.