JPS591186Y2 - Refrigerated open case - Google Patents

Description

[Detailed Description of the Invention] The present invention aims to reduce the amount of frost formed on the built-in cooler in a refrigerated open showcase and to improve the efficiency of the refrigeration system of the showcase.

FIG. 1 is a diagram showing an example of a conventional refrigerated open showcase. In the figure, 1 is an outer case of the main body with an open part 1a formed on the front, and 2 is an outer case with a heat insulating material in approximately the same shape as the outer case 1. The inner case of the main body is formed and provided in the outer case 1, and constitutes the outer case 1 and the main case.

3 is a storage chamber for articles provided inside the inner case 2; 4 is an air circulation path formed along the outer wall of the storage chamber 3 using the gap between the inner case 2 and the storage chamber 3; 5; is provided on the upper edge of the front side of the storage chamber 3 and connects the storage chamber 3 and the circulation path 4. 6 is provided on the lower edge of the front side of the storage chamber 3, and connects the storage chamber 3 and the circulation path 4. 7 is a cooler provided in the circulation path 4, 8 is a blower provided upstream of the cooler 7, 9 is a heater provided upstream of the blower 8, 10 is a circulation This is a drain outlet that communicates the path 4 with the outside.

A conventional refrigerated open showcase is configured as described above. For example, the air driven by the blower 8 is cooled by the cooler 7, flows in the direction of the arrow in the figure, and is blown out from the air outlet 5 into the storage chamber 3. In addition to cooling the inside of the storage chamber 3, an air curtain of low-temperature air is formed in front of the storage chamber 3,
The inside of the storage room 3 is isolated from the outside.

The air flowing into the storage chamber 3 flows through the air intake port 6 into the circulation path 4.
The air is sucked into the air and flows again to the blower 8 and cooler 7.

In this way, an air curtain is formed with low-temperature air, preventing the cold air inside the storage chamber 3 from flowing out to the outside, and cooling the articles.

However, it is impossible to completely prevent cold air from flowing out, and since outside air flows in, even under normal usage conditions, frost buildup on the cooler 7 increases over time. It is necessary to defrost as it reduces the cooling capacity of the

For this reason, defrosting was conventionally performed by raising the temperature in the circulation path 4 using the heater 9, but the amount of frost formed was large and defrosting had to be performed frequently, and the formation of the air curtain was interrupted each time. However, there was a drawback that it was very difficult to maintain the inside of the storage chamber 3 at a low temperature.

The purpose of the present invention is to eliminate the above-mentioned drawbacks and to provide an extremely efficient refrigerated open showcase.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, numerals 1 to 8 and 10 are exactly the same as the conventional device.

Reference numeral 11 denotes a dehumidifying cooler provided in the circulation path 4 upstream of the blower 8, whose temperature level is set higher than that of the main cooler 7, and removes moisture contained in the air flow as a drain.

Further, the spacing between the fins 11A of the dehumidifying cooler 11 is set smaller than the spacing between the fins 7A of the main cooler 7, and the pitch of the tubes 11B of the dehumidifying cooler 11 is smaller than the pitch of the tubes 7B of the main cooler 7. It is set.

The operation of the refrigerated open showcase with such a configuration will be explained.

Since the air sucked in from the air suction port 6 contains a large amount of moisture, it is dehumidified and cooled when passing through the dehumidifying cooler 11, and the moisture contained in the air condenses on the surface of the dehumidifying cooler 11 and is circulated. It is discharged from the path 4 to the outside via the drain outlet 10.

For this reason, the humidity of the air sent to the main cooler 7 is considerably reduced, and the amount of frost formed on the main cooler 7 per unit time is small, and since the air is low temperature, the load on the main cooler 7 is reduced. can be reduced.

In addition, the fin spacing of the dehumidifying cooler 11 is set smaller than that of the main cooler 7 (increase in heat transfer area), and the pipe pitch of the dehumidifying cooler 11 is smaller than that of the main cooler 7. (improvement of air-side heat transfer coefficient), turbulent mixing of the air passing through the dehumidifying cooler 11 is promoted, and the amount of air dehumidified and cooled by the dehumidifying cooler 11 increases, which inevitably In other words, the amount of condensate removed by the dehumidifying cooler 11 increases, and as a result, the amount of frost on the main cooler 7 becomes smaller, and of course the cooling load also decreases.

Furthermore, since the fin spacing of the main cooler 7 is larger than that of the dehumidifying cooler 11, the boundary layer of the passing air develops and the rate of frost formation decreases, so the amount of frost formed on the main cooler 7 still decreases. .

Therefore, the decrease in air flow due to the increase in air resistance caused by frost formation and the decrease in the cooling performance of the main cooler 7 can be significantly improved.

Since there is no need to defrost frequently, the temperature rise in the storage chamber 3 can be kept to a minimum.

As described above, according to the present invention, the amount of frost formed on the main cooler can be minimized, and the amount of drain from the dehumidifying cooler can be increased as much as possible, so there is no need for frequent frosting. To provide a refrigerated open showcase which has an extremely excellent practical effect in that a storage room can be stably kept cold.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional refrigerated open showcase.
FIG. 2 is a longitudinal sectional view of an embodiment of the refrigerated open showcase according to the present invention, and FIG. 3 is a schematic diagram of the cooler according to the present invention. In addition, in the figure, 4 is a circulation path, 7 is a main cooler, and 11 is a dehumidifying cooler.

Claims (1)

[Scope of utility model registration request] A main cooler for cooling the air flow is provided in the air flow circulation path formed within the main body case, and the air flow included in the air flow has a higher temperature level than the main cooler on the upstream side of the main cooler. A dehumidifying cooler is installed to remove moisture as a drain.
and in a refrigerated open showcase in which the dehumidifying cooler and the main cooler are formed into a coupled heat exchanger, the fin spacing of the dehumidifying cooler is made smaller than the fin spacing of the main cooler; A refrigerated open showcase characterized by having a pipe pitch smaller than that of the main cooler.