JPH05312458A - Refrigeration showcase - Google Patents

Abstract

PURPOSE:To improve thermal insulation performance and maintenance performance of a cooled air circulation type refrigeration showcase. CONSTITUTION:In a cooled air circulation type refrigeration showcase, wherein a cooler 6 and a fan for feeding air into a showcase are provided in a cooled air circulation duct 5 defined between an outer case 1 and an inner case 2 of a body of case to circulate cooled air into the showcase for thermally insulating commodities on display, the longitudinal dimension of an impeller 8a of the cross-flow fan 8 is selected so as to correspond to the width of the cooled air circulation duct and further the fan is disposed at the rear of the case under a deck pan 4 provided at the bottom of the case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold air circulation type refrigerating showcase.

[0002]

2. Description of the Related Art First, the structure of a conventional cold air circulation type refrigerating showcase is shown in FIG. 2 by taking a refrigerating open showcase as an example. In the figure, 1 is an outer box of the case body, 2 is an inner box, 3 is a product display shelf installed in a product display room in the inner box,
Reference numeral 4 denotes a deck pan provided at the bottom of the inside of the refrigerator, reference numeral 5 denotes a cold air circulation duct defined between the outer case 1 and the inner case 2, 6 denotes a cooler, and 7 denotes an in-compartment blower fan. Further, the fan 7 is an axial fan, and a plurality of fans are dispersed in the longitudinal direction of the case body and are installed at the bottom portion of the deck pan 4 (commonly referred to as “ship bottom portion”).

With such a structure, the fan 7,
Cool air circulates through the refrigerator via the cooler 6 as shown by the arrow in the figure, and a cool air curtain is formed on the front of the case body to form a cool air curtain to block the ingress of outside air and to be arranged on the product display shelves in the warehouse. Keep the product cold. The figure shows a one-layer air curtain type showcase, but two layers of air curtains,
Alternatively, there is a three-layer type.

[0004]

By the way, the above-mentioned structure in which the axial fan is adopted as the internal fan has the following problems. (1) Since a plurality of fans are distributed in the longitudinal (front) direction of the showcase and arranged in the duct, the wind velocity distribution becomes non-uniform, which adversely affects the air curtain and the cold insulation performance.

(2) Since the impeller of the axial fan is exposed at the suction port of the casing, the deck pan in the refrigerator is removed and the bottom of the case body (the drain port is provided in this part). Moreover, when cleaning the fan, the operator's hand may touch the impeller of the fan and get injured if the fan is running while cleaning it everyday (because dirt easily accumulates due to intrusion of foreign matter). is there. Therefore, normally, the fan is stopped to perform the cleaning work, but if the fan is stopped, the cold air is not blown into the inside of the refrigerator, so that the temperature inside the refrigerator rises. Furthermore, if water is sprinkled into the case at the time of cleaning, the water easily enters the motor and causes a failure.

(3) When inspecting the fan motor, it is necessary to remove the impeller together with the impeller, and the inspection work is troublesome. The present invention has been made in view of the above points, and an object of the present invention is to provide a refrigerating showcase that solves the above-mentioned problems, and can improve cold storage performance and maintainability.

[0007]

In order to achieve the above object, in the refrigerating showcase of the present invention, a cross flow fan is adopted as an in-compartment fan installed in the cold air circulation duct. Further, in the cross-flow fan in the above configuration, it is preferable that the longitudinal dimension of the impeller is determined in accordance with the duct width of the cool air circulation duct, and the cross-flow fan is installed at the bottom side of the deck pan provided at the bottom of the refrigerator. It is preferable to arrange it in the rear part of the case.

[0008]

A cross flow fan is one in which a cylindrical multi-blade impeller is arranged so as to cross the air passage and blows air. The impeller is housed in a casing and a motor is connected to the shaft end of the impeller. Is configured to drive. Therefore, by using a cross-flow fan selected so that the length of the impeller corresponds approximately to the duct width of the cold air circulation duct, a uniform wind velocity distribution can be obtained over the entire width of the duct, and the characteristics of the cross-flow fan can be obtained. As a result, a high static pressure can be obtained, so that even if the cooler is in a frosted state, the reduction in the air volume of the circulating cold air flow is small. Also, since the fan motor is connected to the side of the impeller, by deploying a crossflow fan at the bottom of the case body, you can open the deck pan in the cabinet and remove the motor shaft coupling when inspecting the fan. It is possible to easily take out only the motor while leaving the impeller. Furthermore, by installing the fan at the rear position in the case as much as possible, the fan does not become an obstacle when cleaning the bottom of the case, and cleaning work can be safely performed even while the fan is operating.

[0009]

1 (a) and 1 (b) show an embodiment of the present invention, in which the same members corresponding to those in FIG. 2 are designated by the same reference numerals. That is, in the configuration of FIG. 1, the cooler 6 is arranged on the rear side of the inner box 2, and the cooler 6 is arranged on the bottom of the cool air circulation duct 5 on the upstream side (the bottom of the deck pan 4 on the bottom side). A cross flow fan 8 is installed as a cool air blowing fan so as to cross the duct 5 at a rear position close to. Here, as shown in FIG. 1B, the cross-flow fan 8 has a cylindrical multi-blade impeller 8a, a casing 8b of the impeller, and a fan connected to the shaft end of the impeller 8a via a joint 8c. It is composed of a motor 8d and is selected so that the longitudinal dimension A of the impeller 8a substantially corresponds to the duct width of the cold air circulation duct 5.

When the cross-flow fan 8 is operated with such a structure, cool air is blown in the cool air circulation duct as indicated by an arrow. On the other hand, when cleaning the bottom of the case body, the cleaning work can be safely carried out by removing the deck pan 4 and spraying the bottom of the ship even while the crossflow fan 8 is operating. Also, the cross flow fan 8
At the time of inspection, by removing the joint 8c that connects the impeller 8a and the fan motor 8d, it is possible to take out only the motor while leaving the impeller 8a in the casing 8b.

[0011]

As described above, according to the present invention, by adopting the cross flow fan as the in-compartment blower fan, compared with the conventional refrigerating showcase which uses the axial flow fan, the cool air is cooled. A uniform wind velocity distribution is obtained in the circulation duct, which improves cooling and air curtain performance. Further, when cleaning the bottom of the case body, the cleaning work can be safely performed even while the fan is operating, so that the cleanliness is improved and the maintainability for maintenance and inspection of the fan can be improved.

[Brief description of drawings]

1A and 1B are views showing a configuration of an embodiment of the present invention, in which FIG. 1A is a sectional view of the entire refrigeration showcase, and FIG. 1B is a configuration diagram of a crossflow fan incorporated in the case.

FIG. 2 is a sectional view showing the structure of a conventional cold air circulation type refrigerating open showcase.

[Explanation of symbols]

 1 Outer box 2 Inner box 4 Deck pan 5 Cold air circulation duct 6 Cooler 8 Cross flow fan 8a Impeller

Claims (3)

[Claims] 1. A cooler and a fan are provided in a cool air circulation duct defined between an outer box and an inner box of a case body surrounding a commodity display room in the case, and a cool air is circulated and blown inside the case for display. In the cold air circulation type refrigerated showcase that keeps products cool,
A refrigerated showcase characterized by adopting a cross flow fan as the fan. 2. The refrigerated showcase according to claim 1, wherein the impeller of the cross flow fan has a longitudinal dimension set to a dimension corresponding to the duct width of the cold air circulation duct. 3. The refrigerated showcase according to claim 1, wherein the cooler is arranged in the rear duct of the inner box, and the crossflow fan is arranged on the lower surface side of the deck pan provided at the bottom of the inside of the refrigerator and at the rear portion of the case. Refrigerated showcase characterized by doing