JPS62293075A - Cold counter with front-surface door - 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] 3. Detailed description of the invention [Technical field to which the invention pertains] This invention has a door at the front opening for product removal of the main body case, and also uses a fan to draw uncooled air during defrosting operation. This relates to a refrigerated showcase with a front door that blows air to defrost.

[Prior art and its problems]

As this type of refrigerated showcase, the ones shown in FIGS. 4 and 5 are known. In this figure, 1 is a main body case formed in a U-shape in cross section with a front opening 1a, and consists of an outer box 2 and an inner box 3 made of heat insulating walls. A cold air circulation path 5 is formed inside the refrigerator 4 and between the outer box 2 and the inner box 3. 6 is a door provided with the opening 1aG.

The cold air circulation path 5 has both upper and lower ends facing the opening 1a to form a cold air outlet 5a and an inlet 5b, and a fan 7 and a cooler 8 are disposed inside. Further, the inside of the warehouse 4 is partitioned into upper and lower multiple stages by shelf boards 9, and the products 10 are efficiently displayed and stored.

During the cooling operation of the above-mentioned refrigerated showcase, air inside the refrigerator is sucked through the fan 7 through the suction port 5b into the cold air circulation path 5, and is cooled by the cooler 8 to become cooling air, which is circulated as shown by arrow A. Ru. Thus, the products 10 in the warehouse 4 are cooled and kept cold by the cooling air.

The cooling operation is a! If this continues, frost will form on the cooler 8, etc., and the cooling capacity will decrease, so defrosting operation is performed at appropriate intervals. The start time of this defrosting operation is usually set by a 24-hour timer, and during the operation, the flow of refrigerant to the cooler 8 is stopped and only the fan 7 is operated. The frost on the cooler 8 and the like is removed by the non-cooled air that is circulated by the fan 7 as shown by arrow A. Then, the defrosting operation is terminated by detecting a temperature change of the non-cooled air or by elapse of a certain period of time set in the timer.

By the way, in defrosting by conventional defrosting operation, the defrosting operation time is generally long because the amount of heat for defrosting held by the non-cooled air is small. For this reason, in conventional refrigerated showcases,
During the defrosting operation, there was a risk that the product 10 would be warmed up and the quality of the product 10 would deteriorate.

[Purpose of the invention]

The object of the present invention is to provide a refrigerated showcase with a front door that can perform defrosting operation without degrading the quality of products and can always maintain high cooling capacity.

[Key points of the invention]

In this invention, defrosting operation is performed when the door is opened, and during defrosting operation, the fan is rotated in reverse to actively draw in outside air, and the outside air with a large amount of heat can be used to remove mist in a short time. This is how it was done.

[Embodiments of the invention]

FIG. 1 and FIG. 2 show an embodiment of this invention.
Parts common or identical to those in FIGS. 4 and 5 are designated by the same reference numerals.

In FIGS. 1 and 2, reference numeral 11 is a condensation unit that is installed outside the main body case and constitutes a refrigeration cycle with the cooler 8, and supplies the refrigerant to the cooler 8 via the refrigerant pipe 12 at the arrow B.
Supply in circulation as shown below. 13 is an electromagnetic on-off valve provided in the middle of the refrigerant pipe 12; 7a is a fan motor of the fan 7;
4 is a capacitor for forward and reverse rotation for the fan motor 7m;
A switch 15 is operated by opening and closing the door 6, and controls the opening and closing of the electromagnetic on-off valve 13 and the forward and reverse rotation of the fan motor 7a. The electric circuit of the fan motor 7a, the electromagnetic on-off valve 13 and the switch 15 is shown in FIG.

In the above configuration, the refrigerated showcase is operated as shown in the operation chart of FIG. That is, when the door 6 is closed, the switch 15 closes the contact 15a, the electromagnetic on-off valve 13 opens, and the fan 7 is operated in normal rotation. Thus, the refrigerated showcase performs a cooling operation, and the products 10 in the warehouse 4 are cooled and kept cold. Also, when door 6 is opened, door 6
When the switch 15 opens the contact 15a, the switch 15 opens the contact 15a.
b is closed, the electromagnetic on-off valve 13 is closed, and the fan 7 is operated in reverse rotation. The cooler 8 then stops cooling, the fan 7 sucks outside air into the cold air circulation path 5 from the cold air outlet 5a, and the refrigerated showcase enters the defrosting operation. The outside air flows through the cold air circulation path 5 in the opposite direction to the arrow A, washes the cooler 8, etc., and is blown out from the suction port 5b toward the opening 1a. It has a much larger amount of heat and efficiently removes the heat 1i of the cooler 8'4. In addition, the outside air blown from the suction port 5b toward the opening 5' 151m acts to push the cold air inside the refrigerator out of the refrigerator from the opening 1a. As described above, when the door 6 is opened, the cooling capacity of the cooler 8 is maintained at a good level by the defrosting operation performed by introducing outside air. Furthermore, since the defrosting operation time for the products 10 in the warehouse 4 is short and there is little outflow of cold air inside the warehouse, an increase in product temperature due to the defrosting operation can be avoided.

〔Effect of the invention〕

According to this invention, a reversible rotary motor is used for the fan motor of the fan, and the motor is linked to the opening and closing of %J'l'.
When the door is opened and closed, the flow of refrigerant to the cooler is stopped and the fan is operated in reverse rotation, so the cooler can be efficiently defrosted in a short time using warm outside air. Furthermore, since the products in the warehouse are not subjected to continuous defrosting operation for a long period of time, a rise in product temperature can be avoided and good quality can be maintained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a refrigerated showcase showing an embodiment of this invention, Fig. 2 is the same electric circuit diagram of the main part of the invention, Fig. 3 is an operation chart, and Fig. 4 is the subject of this invention. A perspective view of a refrigerated showcase, and FIG. 5 is a sectional view of a conventional refrigerated showcase. DESCRIPTION OF SYMBOLS 1... Main body case, 5... Cold air circulation path, 6... Door, 7... Fan, 8... Cooler, 13... Solenoid shut-off valve, 15 No. 112 Fig. 2 Fig. 3 Figure 4 Figure 7 Fan Figure 5

Claims (1)

[Claims] 1) A cold air circulation path is formed in a main body case having a U-shaped cross section with an open front and a door in this opening, with upper and lower ends facing the opening inside the door and forming a cold air outlet and an inlet, respectively; A fan and a cooler are disposed in the cold air circulation path, and the fan circulates the air inside the refrigerator through the cooler to cool the interior of the refrigerator, and also stops the flow of refrigerant to the cooler. In a refrigerated showcase with a front door that defrosts uncooled air by circulating uncooled air using a fan, a reversible rotary motor is used for the fan motor of the fan, and the fan motor is linked to the opening and closing of the door, and when the door is opened, it is sent to the cooler. A refrigerated showcase with a front door, characterized in that the flow of refrigerant is stopped and the fan is operated in reverse rotation.