JPS6148070B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerated case for storing, for example, cigarettes or foods at relatively high humidity.

For example, in order to refrigerate cigarettes or foods, it is necessary to maintain not only low temperature but also a certain degree of humidity. However, since conventionally used refrigerated cases utilize a freezing cycle, they can only be stored at low temperatures, and humidity is kept low. That is, when the cooler exchanges heat with the air in the storage room, it condenses moisture and becomes dry. Therefore, when storing the above-mentioned items, it is necessary to prevent them from drying out by storing them in a box or wrapping them in multiple layers of wrapping paper. Therefore, it not only takes up storage space but also requires a long cooling time, which is not economical.

To increase humidity, for example, a humidifier is installed in the storage room, a natural convection type storage room is installed, or a damper is used to periodically shut off the circulating cold air. The humidity varies widely, making it unsuitable for long-term storage.

Therefore, a method was developed that has a refrigerating capacity approximately 1.5 to 2 times that of a general refrigerated case, sets the compressor's operating and stopping times to be shorter, and constantly drives a blower for circulating cold air. In this case, relatively high humidity can be secured, but the range is between 50 and 90%.
and very wide. The humidity range can be narrowed by shortening each operating time, but in order to keep the range to about 10%, the operating and stopping times must be set at a ratio of 2 minutes and just under 1 minute, which places a high burden on the compressor. There is a risk that the pressure balance will deteriorate and restart will not be possible.

However, it is known that in order to obtain high humidity, the smaller the difference between the dew point in the storage room and the temperature of the cooler, the more humid the room will be.

The present invention has been made in view of the above circumstances, and its purpose is to increase the stop time of the refrigeration cycle operation by selecting the heat-sensitive state of the heat-sensitive part of the temperature controller, and to control the temperature of the cooler and storage. By bringing the difference between the indoor temperature and the dew point closer together to achieve a constant temperature and humidity condition, and by setting the rotation speed of the circulation blower,
The purpose of the present invention is to provide a refrigerated case in which the humidity can be selected while maintaining the cooling temperature.

An embodiment of the present invention will be described below based on the drawings. In the figure, 1 is a storage room 2 at the top and a machine room 3 at the bottom.
The main body of the case is divided into sections. The storage chamber 2 has an opening 4 on its front surface, and a door body 5 is pivotally attached to the storage chamber 2 so as to be openable and closable. The periphery is covered with a heat insulating material 6, and a plurality of shelves 7 (not shown) for placing stored items are provided inside. The lower part of the storage room 2 is divided by a partition plate 10 which has an air outlet 8 on the back side and an air inlet 9 on the front side, and a cooler 11 and a circulation blower 12 are installed in the lower part of the partition plate 10 so as to be spaced apart from each other. will be placed. Further, the partition plate 10 is extended at a predetermined interval on the back side and the top side of the heat insulating material.
By driving the circulation blower 12, air is blown in the direction of the arrow. That is, cooler 1
1 , and is blown out from the upper surface side of the opening 4 toward the suction port 9 via the space between the back side and upper surface side of the heat insulating material 6 and the partition plate 10 . Therefore, an air curtain is formed in the opening 4, and even if the door body 5 is opened, the cold air in the storage room 2 will not leak out. A heat-sensitive portion 13a of a temperature regulator 13, which will be described later, is attached to the front side of the upper surface of the cooler 11 while being covered with, for example, a protective tube. Furthermore, on the front side of the cooler 11, the above-mentioned partition plate 10
A baffle plate 14 provided in the structure is extended downwardly. This baffle plate 14 is for shielding the air from the circulation blower 12 from hitting a part of the cooler 11. If the height dimension of the cooler 11 is H, the baffle plate 14 is at least 1 /3H must be opposite. Since the heat-sensitive portion 13a is also located near the baffle plate 14, it is shielded from the wind from the circulation blower 12.

The machine room 3 is provided with a compressor 15, a condenser 16, a condenser cooling blower 17, and the like.
The compressor 15 and the condenser 16 communicate with the cooler 11 via a refrigerant pipe (not shown) so as to constitute a refrigeration cycle.

The electric circuit of the refrigerating case constructed in this manner is shown in FIG. In the figure, 20 is a power switch, 21 is an electromagnetic switch, 22 is a defrosting time switch, 13 is the temperature regulator,
12a is a fan motor of the circulation blower 12;
23 is a changeover switch for switching the fan motor 12a between high speed rotation and low speed rotation, 15a is the motor of the compressor 15, 24 is an electromagnetic shut-off valve provided in the refrigeration cycle, and 17a is the blower for cooling the condenser. 17 fan motor.

Next, the operation of the above embodiment will be explained. By closing the power switch 20, the fan motor 12a is energized and the circulation blower 12 starts to be driven. At this time, the changeover switch 23 is switched to the high speed rotation side of contact a, for example. Wind circulates within the storage chamber 2 as shown in the direction of the arrow in the figure. Further, since the storage room 2 is at a high temperature, the temperature regulator 13 is closed, and the motor 15a, the electromagnetic on-off valve 24, and the fan motor 17a are energized. The compressor 15 starts refrigeration cycle operation and the electromagnetic on-off valve 24 is opened. Therefore, the cooler 11 is the circulation blower 1.
By exchanging heat with the air inside the storage chamber 2 led from the storage chamber 2 and converting it into cold air, the items to be stored (not shown) on the shelves 7 can be cooled. The heat sensitive part 13a of the temperature regulator 13 is shielded from the circulating cold air by the presence of the baffle plate 14, and senses the temperature of only the cooler 11. Then, the heat sensitive part 13a is set at a set temperature (for example -
7.5°C), it sends a signal to the temperature regulator 13 to open it. The compressor 15 and the condenser cooling blower 17 are stopped, and the electromagnetic on-off valve 24 is closed. By closing the electromagnetic on-off valve 24, even a small amount of refrigerant does not flow into the cooler 11 while the refrigeration cycle is stopped, making it possible to reduce this temperature change and to avoid putting a burden on the cycle. Since the circulation blower 12 continues to operate, the temperature and humidity in the storage room 2 do not rise rapidly. Further, since the heat sensing portion 13a continuously senses the temperature of the cooler 11 without being affected by the wind at this time, the stop time of the compressor 15 becomes relatively long. Set temperature (e.g. 0℃)
When detected, the temperature regulator 13 is closed again. The above set temperature takes into consideration various conditions such as the refrigerating capacity of the compressor 15, the amount of heat leakage from the storage room 2, the size of the cooler 11, the air volume of the circulation blower 12, and the speed of cool air blowing from the upper end of the opening 4. It can be decided by As a result, with an operating rate of about 50%, the temperature inside the storage chamber 2 can be kept at about 3 to 4 degrees Celsius, as shown in Figure 5, and the temperature can be kept within the range of 70 to 85%, achieving the desired temperature. and high humidity.

When the changeover switch 23 is moved to contact point b to switch the circulation blower 12 to the low speed rotation side, the effect is exactly the same as in the case of high speed rotation, but the temperature and humidity change as shown in FIG. In other words, since the wind speed of the circulating cool air is reduced, the amount of heat exchanged by the cooler 11 is reduced, and the lowest temperature of the cooler 11 itself (for example, -15° C.) can be set low. Also, for this reason, more moisture in the storage room 2 will condense,
Humidity is kept within a relatively low range of 45-60%. The temperature can be maintained at 3 to 4°C as in the case of high-speed rotation.

In either case, if the refrigeration cycle is operated intermittently, frost will form on the cooler 11 and the heat exchange effect will deteriorate, so if necessary, turn off the time switch 2.
Activate 2. At this time as well, the compressor 15 and condenser cooling blower 17 are stopped and the electromagnetic on-off valve 24 is closed, but the circulation blower 12 continues to be driven to avoid a sudden rise in temperature and humidity.

In the above embodiment, the circulation blower 12 and the cooler 11 are arranged separately, but the invention is not limited to this, and as shown in FIG. A blower 12 may also be provided. In this case, the mounting plate 12b of the circulation blower 12 can be extended and integrated with the baffle plate 14a.

Alternatively, the baffle plate 14b may be directly attached to the cooler 11 as shown in FIG. It is preferable that both the height and the horizontal dimension of the baffle plate 14b be set to about 1/3 of the height dimension H of the cooler 11 to shield the heat sensitive part 13a.

As explained above, according to the present invention, a circulation blower is provided that blows air into the cooler and forcibly circulates cold air into the storage chamber, and the temperature is sensed by a heat-sensitive section attached to the cooler to control the refrigeration cycle operation. Since a temperature regulator is provided and a baffle plate is provided to shield the heat-sensing section from the air from the circulation blower, the influence of air blowing on the heat-sensing section can be eliminated and the temperature of only the cooler can be sensed. As a result, even if the circulation blower is constantly running, the refrigeration cycle operation will take a long time to stop, and the difference between the dew point of the storage room temperature and the cooler temperature will become smaller, and a constant temperature and humidity state will be maintained. Ideal for preservation. Moreover, by setting the rotation speed of the circulation blower, the humidity can be selected while maintaining the cooling temperature, allowing for refrigeration according to the stored items, and reducing the operating rate, resulting in power savings.
We can provide low-cost and highly reliable refrigerated cases.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a refrigerated case showing an embodiment of the present invention, Fig. 2 is a schematic longitudinal cross-sectional view thereof, Fig. 3 is an enlarged longitudinal cross-sectional view of main parts, Fig. 4 is an electric circuit diagram, Figure 5 is a diagram of changes in humidity and temperature in the storage room and the temperature of the cooler when the circulation fan is set to high rotation speed, Figure 6 is a diagram of the same change when the circulation fan is switched to low rotation speed, and Figure 7 is a diagram of changes in the temperature of the cooler. FIG. 8 is a vertical cross-sectional view of a main part showing still another embodiment of the present invention. 2... Storage room, 11... Cooler, 12... Circulating blower, 13a... Heat sensitive section, 13... Temperature controller, 14... Baffle plate.

Claims (1)

[Claims] 1. A storage room that stores items to be stored, a cooler that is placed at the bottom of this storage room to cool the inside of the storage room, and a cooler that is placed facing away from this cooler and blows air into the cooler to force cold air into the storage room. A circulating air blower, a temperature regulator equipped with a heat sensitive part that is provided in contact with the cooler and senses the temperature of the cooler, and a temperature regulator that is provided with a narrow gap from the heat sensitive part of the temperature regulator. A refrigerated storage case characterized by comprising a baffle plate for shielding the air from the circulation blower so that the air from the circulation blower does not hit, and adjusting the humidity in the storage room according to the setting of the rotational speed of the circulation blower.