JPS58148376A - Regulator for temperature in freezing refrigerating showcase - 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 The present invention relates to an internal temperature controller for a refrigerated freezer showcase, such as a showcase for handling chilled foods, frozen products, etc., which is installed in a large store such as a supermarket.

The application case is equipped with a refrigerator either separately or built-in.
By operating this refrigerator, the products displayed inside the shimmy case are kept cool. An overview of the functions of such a showcase and an internal temperature controller will be described with reference to FIG.

In the figure, 1 is a showcase cabinet, 2 is a product displayed in the internal display room of the cabinet 1, and 6 is a refrigerator. The refrigerator 3 has an electric compressor 51. Capacitor 52. Evaporator55. A refrigerating machine circuit is constructed using the excellent 34 as the main parts, and among these, the evaporator 53 is installed in the cold air circulation ventilation duct 11 of the cabinet 1. Note that 12 is an internal fan, and 13 is an internal illumination light. By operating the refrigerator with this configuration, cold air cooled by heat exchange with the evaporator 35 circulates as shown by the arrow, forming a cold air curtain toward the front opening of the cabinet 1. On the other hand, check the internal temperature of product 2.
In order to constantly maintain the humidity suitable for keeping the refrigerator cold, the temperature inside the refrigerator*m
Equipment 4 is installed. This internal concentration adjustment-4 compares the temperature detected by the temperature sensor 41 installed inside the refrigerator with the set value of the internal humidity adjustment given in advance by external settings, and detects that the detected internal concentration has decreased below the set concentration. At this time, a control signal is output to stop the operation of the refrigerator 3. This stop signal is applied to, for example, a liquid electromagnetic valve 5 inserted into the high pressure side of the illustrated refrigerant circuit to close the valve. As a result, a high pressure switch (not shown) is activated, and the control circuit is configured to disconnect the electromagnetic contactor 6 connected to the power supply circuit of the compressor 61 and stop the refrigerator 3.

Further, if the temperature inside the refrigerator becomes higher than the set temperature, the refrigerator 3 starts operating.

This type of freezer/refrigerator Jiro case not only controls product temperature using the internal temperature WR#, but also requires less running costs for operation, and has a lower capacity than the required refrigeration capacity in terms of equipment costs. Therefore, it is desirable to be able to use a compressor with as small a capacity as possible.

By the way, showcases are operated day and night to maintain the quality of products, regardless of when the store opens or closes, but during the night after the store closes, compared to the daytime business hours, the showcases and inside the store are operated. Since the illumination lights are also off and the ambient temperature is low, the amount of radiant heat entering from the outside is reduced. Taking this into consideration, in the past, in order to save electricity while maintaining the product temperature at a predetermined temperature, the internal temperature controller was used to set the internal humidity in two stages, high and low. Some attempts have been made to control the operation by selecting a set temperature. Fig. 2 shows the operation pattern of this two-stage refrigerator temperature controller J. In other words, during the d-open time period, the temperature inside the refrigerator is set to a set temperature T based on normal standard ambient conditions. is selected, and during the night time period, the setting humidity T1, which is higher than the setting temperature To, is appropriately translated. This makes it possible to obtain constant product temperature characteristics, as shown by the characteristic line, regardless of day or night. According to this method, the operation rate of the refrigerator during night time is reduced, so that the power consumption can be reduced by that amount and power can be saved.

However, in the above system, a low set temperature T is selected during daytime hours for normal operation, so the chiller must have a sufficiently large capacity to accommodate this. . Furthermore, even though power-saving operation is carried out during nighttime hours, if you are a commercial power consumer such as a large store and have a contract for late-night electricity rates, you may find yourself in a situation where electricity rates are lower during the night. Even if power is saved, the effect of reducing running costs is not as large as that shown on the left.

This invention is based on the above points, and its purpose is to maintain the quality of the product while reducing running costs by effectively utilizing low-cost late-night electricity. In addition, we provide an internal temperature controller for freezer/refrigerator showcases that can greatly contribute to overall energy savings for show nurses, such as by making it possible to use smaller-capacity refrigerators than conventional models. There is a particular thing.

This purpose is achieved by the present invention, which allows the user to select two levels of high and low temperature settings in the refrigerator.
) This was achieved by configuring the system to set the temperature and select a low set temperature during the night hours after closing when the late-night electricity rate is applied, and select a high set temperature at other times. Ru.

The present invention will be explained below based on illustrated embodiments.

Fig. 3 is an operation pattern diagram showing the operating characteristics of the internal temperature controller according to the present invention, and Fig. 4 is a specific configuration circuit diagram of the internal humidity regulator. As shown in the figure, the temperature controller according to the present invention has two selectable high and low internal control temperature set values Tg and T8, and the lower set temperature Ta is selected during the night time, and the lower set temperature Ta is selected during the daytime. A high set temperature Tg is selected for the band. In addition, the setting is exactly m!
is set to a higher temperature of the noodles than the daytime set temperature To described in FIG. In order to automatically adjust the set humidity, as shown in FIG. After closing, the book selection terminals T21 and T8' are pulled out, and the selection relay 46, which switches on/off condition (6) of the flashing switch 7 of the showcase illumination light, turns off the illumination light. The selection terminal T8' is selected at night, and the selection H terminal T2' is selected during the daytime hours when the office lights are turned on. Note that 44 is a control contact of the temperature i1 moderator 4, and this control output signal is given to the liquid electromagnetic valve 5 inserted in the refrigerant circuit of the refrigerator, as described in FIG. 1, for example. It is also possible to selectively switch between the high and low set temperatures using a timer instead of the illumination light switch.

According to the above configuration, first, a low set temperature is selected during the night time period, and at night after the store is closed, the ambient conditions are good and there is almost no influence of radiant heat from the lighting. Therefore, the products displayed in the warehouse are cooled to a sufficiently low temperature and heat is stored. Furthermore, late-night electricity charges apply during this time, so even if the operating rate of the chiller is high, the electricity charges will be low. Next, in the daytime (1141 zone), the V constant temperature is switched to the lower side, so the operation rate of the refrigerator is lower and the power consumption is reduced, and it is also possible to use a small @- machine as a compressor. Become. On the other hand, when it comes to products, the influence of radiant heat from outside air and lighting is greater than at night, and the temperature inside the refrigerator does not drop sufficiently due to the selection of a high temperature setting. It is possible to compensate for the temperature setting and maintain the product temperature within a predetermined temperature range.As a result, the product temperature characteristics can be seen to fluctuate to some extent during the day and during the day, as shown in the characteristic MA' in Figure 5. However, it is possible to maintain stable quality by maintaining the specified temperature of the food.Although it may be a little overcooled during nighttime hours, for example, chilled foods, frozen foods, etc. can maintain quality even if they are slightly overcooled. There is no need to worry about deterioration.

As mentioned above, by adopting the refrigerator temperature controller according to the present invention, it is possible to utilize low-cost late-night electricity at night, to efficiently cool products under favorable conditions, and to store sufficient heat. At the same time, during the daytime, it is possible to maintain the temperature of the product by utilizing the sufficient amount of heat stored during nighttime operation of the product, while increasing the power saving effect by selecting a high temperature setting. can greatly contribute to comprehensive energy conservation.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a refrigerated white case, Figs. 2 and 3 are operation pattern diagrams of internal humidity regulators based on conventional and embodiments of the present invention, respectively, and Fig. 4 is an implementation of the present invention. FIG. 2 is a configuration circuit diagram of an example. 1 Niji I-case cabinet, 2: Product, 3: Freezer, 4: Internal temperature controller, 41: Temperature sensor for detecting internal temperature, 7: Light flashing switch, T2: High setting temperature,
T8: Low set temperature, T2': High set temperature selection terminal, T
B': Low setting concentration selection terminal. (9)

Claims (1)

[Claims] 1) Freezer/refrigerator unit installed and used in a store - A refrigerator attached to a showcase that compares the detected internal temperature of the case with a preset value of the internal adjustment concentration. In the refrigerator temperature regulator that outputs an operation control signal, the refrigerator temperature is set as the preset temperature at a selectable temperature in two stages, high and low, and a low preset concentration is selected during the night time after the store is closed; An internal temperature controller for a freezer/refrigerator showcase, characterized in that it is configured to select a high set temperature and control the operation of the refrigerator during other times. 2. In the refrigerator temperature controller according to claim 1, the selection of each set temperature in two high and low stages is automatically performed in response to the on/off operation of the light blinking switch of the showcase. An internal temperature controller for a refrigerated freezer showcase configured as follows.