JP2000088429A - Low temperature showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily prevent the remaining of air in a cooler or to suppress it to a minimum limit by mounting an air bleeding pipe to communicate with an uppermost part of a brine pipe for constituting a cooler. SOLUTION: One end of a fine air bleeding pipe 12 is connected to a connector connected to brine piping 8. The other end of the pipe 12 is drawn down and extended to the vicinity of a lower side of a deck pan D, and a valve 13 with a core is mounted at a front end of the pipe 12. At this time, the pipe 12 communicates with a brine pipe 10A of an uppermost part to press an end of the valve 13 so as to draw out the air retained in an upper part in a cooler 1 to an exterior via the pipe 12. Thus, low temperature brine can be smoothly circulate to conduct an effectively cooling operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-temperature showcase for circulating and cooling brine cooled by a cooling device to a cooler.

[0002]

2. Description of the Related Art Conventionally, CFC refrigerants have been used in low-temperature showcases and commercial refrigerators installed in supermarkets and the like as refrigerants exhibiting a cooling action. Such CFC refrigerants are being regulated internationally as a specific CFC that causes destruction of the ozone layer. Regulations on the production and use of specified CFCs began in Japan in July 1989, and production was discontinued at the end of 1995. Therefore, in order to maintain a modern society, production and use of alternatives to specific CFCs or reduction of CFC refrigerants have become important.

Therefore, in recent years, the brine is cooled by a cooling device having a predetermined refrigerant circuit, the brine is circulated through the brine circuit, supplied to a cooler provided in the brine circuit, and used to cool a low-temperature showcase. A device for cooling the inside of the refrigerator has been developed. According to such a method, it is possible to remarkably reduce the amount of CFC refrigerant compared with the conventional system in which the refrigerant compressed by the refrigerator and condensed by the condenser is circulated to the cooler of each low-temperature showcase.

[0004]

However, particularly during the brine filling operation, the brine cannot be completely filled in the brine circuit, and air remains in the brine circuit. This air stays in the cooler installed in the low-temperature showcase and hinders the circulation of brine, so that there has been a problem that the cooling capacity is reduced.

[0005] In order to solve the conventional technical problem, the present invention provides a low-temperature showcase that can easily prevent or minimize air from remaining in a cooler. With the goal.

[0006]

A low-temperature showcase of the present invention circulates and cools brine cooled by a cooling device to a cooler. The low-temperature showcase is provided at the top of a brine pipe constituting the cooler. They are connected to each other and fitted with an air vent pipe.

According to the present invention, in a low-temperature showcase in which brine cooled by a cooling device is circulated to a cooler and cooled, an air bleeding pipe is connected to the top of a brine pipe constituting the cooler. Since it is attached, air remaining in the cooler can be smoothly extracted from the air vent pipe. This makes it possible to prevent or minimize the air from remaining in the cooler, and to realize an efficient cooling operation by circulating low-temperature brine.

A low-temperature showcase according to a second aspect of the present invention is a low-temperature showcase according to the second aspect of the present invention, in which an air vent pipe extends to the vicinity of the deck pan.

According to the second aspect of the present invention, in addition to the above, the air vent pipe extends to the vicinity of the deck pan.
By removing the deck pan and performing the air bleeding operation, it is not necessary to make a special structural change to the existing low-temperature showcase. Further, the risk of the inside of the refrigerator being soiled by the brine leaking from the air vent pipe is reduced.

A low-temperature showcase according to a third aspect of the present invention is a low-temperature showcase according to the third aspect of the invention, in which a valve with an insect is attached to a tip of the air vent pipe.

According to the third aspect of the present invention, in addition to the above-mentioned inventions, since the valve with the insect is attached to the tip of the air vent pipe, the air can be vented from the cooler by an extremely simple operation. The workability is remarkably improved.

A low-temperature showcase according to a fourth aspect of the present invention, in addition to the above-mentioned inventions, circulates brine from the upper part to the lower part of the cooler.

According to the fourth aspect of the invention, in addition to the above inventions, the brine is circulated from the upper part to the lower part of the cooler. Is reversed, the heat exchange efficiency between the circulating cool air and the cooler is improved, and the cooling efficiency can be further improved.

[0014]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic sectional view of a low-temperature showcase R to which the present invention is applied. Note that solid arrows in FIG. 1 indicate the flow of cool air in the duct. The low-temperature showcase R of the embodiment is, for example, a vertical open showcase installed in a supermarket store, and includes a heat insulating wall 2 having a substantially U-shaped cross section which constitutes a main body, and a heat insulating wall 2 at the installation site. It is constituted by side plates (not shown) attached to both sides.

In the low-temperature showcase R, a storage room 3 is formed in a main body that opens to the front, communicates with the storage room 3, and a duct 14 extends over the bottom surface, the back surface, and the top surface of the heat insulating wall 2. (Circulation path) is formed. In the duct 14 on the rear side of the heat insulating wall 2, a cooler 1 described later in detail is vertically provided. Further, a blower (not shown) is provided in the duct 14 on the bottom surface, and cool air cooled by the cooler 1 is blown upward in FIG. 1 by the blower, and is discharged from a discharge port formed at an upper edge of the opening. It discharges toward the suction port formed in the opposing lower edge part.

As a result, a cool air curtain is formed at the opening of the storage room 3 to prevent outside air from entering the storage room 3 and a part of the air is circulated into the storage room 3 so that the inside of the storage room 3 can be circulated. Has cooled.

In the low-temperature showcase R, a detachable deck pan (commodity placing plate) D having a predetermined area is placed on the bottom of the storage room 3, and the commodities placed on a tray made of styrene resin on the deck van D Food) are displayed side by side.

Next, a cooling device 4 and a brine circuit 5 for cooling the inside of the storage room 3 of the low-temperature showcase R in this embodiment will be described with reference to FIG. Cooling device 4
Is installed in a machine room of a supermarket, for example, and includes a well-known refrigeration cycle in which a compressor (not shown), a condenser, an expansion valve, an evaporator, and the like are sequentially connected in a ring shape. An annular refrigerant circuit is formed by filling a fixed amount. The pipes are arranged so that the evaporator exchanges heat with the heat exchanger 21 of the brine circuit 5.

The brine circuit 5 includes a brine pipe 8 connected to the outlet side of a heat exchanger 21 for exchanging heat with the evaporator of the cooling device 4, and a plurality of coolers 1 and 2 connected in parallel to the brine pipe 8. (In the present embodiment, branching into the coolers of the three low-temperature showcases) and a brine pipe 9 connected between the outlet side of each cooler 1 .. and the inlet side of the heat exchanger 21 And a circulation pump 7 interposed in the brine pipe 9 and an expansion tank 6 communicated with the brine pipe 9 to form an annular shape. In addition, since each of the brine pipes 8 and 9 is piped from the machine room to each of the low-temperature showcases R in the store, a heat insulating material is provided around them.

Next, the cooler 1 according to the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 3 shows a cooler 1 to which the present invention is applied.
FIG. The cooler 1 is a showcase R as described above.
Vertically installed in the duct 14 of the heat insulating wall 2 of the
And a plurality of heat exchange fins 22 attached vertically to the brine pipe 10 so as to be able to exchange heat with the cold air in the pipeline 4.
・ It is composed of

At the end of the brine pipe 10A at the top of the cooler 1, the brine pipe 8 is
A is connected through A. Further, a brine pipe 9 is connected to an end of a lowermost brine pipe 10B of the cooler 1 via a connector 11B. Thereby, the brine in the brine circuit 5 is supplied from the upper end of the cooler 1, flows down in the brine pipe 10, and flows out from the lower end of the cooler 1.

When the compressor of the cooling device 4 is operated, the evaporator of the cooling device 4 performs a cooling action, and the heat in the heat exchanger 21 of the brine circuit 5 that is disposed so as to exchange heat with the evaporator. The brine is cooled. Then, the cooled low-temperature brine is supplied to the cooler 1 through the brine pipe 8, and exerts a cooling action.

The brine which has exerted a cooling action while flowing down in the cooler 1 flows out from the lowermost part, is sucked by the circulation pump 7, and is discharged again to the heat exchanger 21. At this time, since the low-temperature brine circulates from the upper side to the lower side in the cooler 1, when it is disposed in the duct 14 of the showcase R, the circulation direction of the cool air circulating in the duct 14 is opposite. (Counterflow), and the heat exchange efficiency can be further improved.

On the other hand, one end of a thin air vent pipe 12 is connected to the connector 11 to which the brine pipe 8 is connected. The other end of the air vent pipe 12 is pulled down to near the lower side of the deck pan D and extends. At the end of the end of the air vent pipe 12, a valve 13 with an insect is attached.

The worm-carrying valve 13 is opened when its tip is pushed into the air bleeding pipe 12, and is sealed when the pushing force is removed. At this time, since the air vent pipe 12 is in communication with the uppermost brine pipe 10A via the connector 11A, by pushing the tip of the worm valve 13, the air remaining in the upper part of the cooler 1 is removed. It can be smoothly extracted to the outside via the air vent pipe 12. Thereby, since the residual air in the cooler 1 can be prevented or the residual amount can be suppressed to the minimum, the circulation of the low-temperature brine can be performed smoothly, and a more effective cooling operation can be realized. become.

Further, the operation of removing air from the cooler 1 can be performed by an extremely simple operation only by operating the valve 13 with insects, and the workability is remarkably improved.

In particular, since the air vent pipe 12 extends to the vicinity of the deck pan D detachably mounted on the bottom surface of the heat insulating wall 2 of the showcase R, the deck pan D
The air bleeding operation can be easily performed by removing the air. Therefore, compared with the case where the air vent valve is installed above the cooler 1, it is not necessary to make a special structural change such as providing an air vent working port on the back surface of the heat insulating wall 2. In addition, since there is an insect valve 13 near the deck pan D, the pipe
Even if the brine leaks from the storage chamber 3, there is no danger of the inside of the storage room 3 being soiled.

[0028]

As described above in detail, according to the present invention, in a low-temperature showcase in which brine cooled by a cooling device is circulated to a cooler and cooled, the low-temperature showcase communicates with the top of a brine pipe constituting the cooler. Since the air vent pipe is attached, the air remaining in the cooler can be smoothly extracted from the air vent pipe. This makes it possible to prevent or minimize the air from remaining in the cooler, and to realize an efficient cooling operation by circulating low-temperature brine.

According to the second aspect of the present invention, in addition to the above, since the air vent pipe extends to the vicinity of the deck pan,
By removing the deck pan and performing the air bleeding operation, it is not necessary to make a special structural change to the existing low-temperature showcase. Further, the risk of the inside of the refrigerator being soiled by the brine leaking from the air vent pipe is reduced.

According to the third aspect of the present invention, in addition to the above-mentioned inventions, since a valve with a bug is attached to the tip of the air vent pipe, air can be vented from the cooler by an extremely simple operation. The workability is remarkably improved.

According to the fourth aspect of the invention, in addition to the above inventions, the brine is circulated from the upper part to the lower part of the cooler. Is reversed, the heat exchange efficiency between the circulating cool air and the cooler is improved, and the cooling efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a low-temperature showcase according to an embodiment of the present invention.

FIG. 2 is a diagram showing a cooling device and a brine circuit of the low-temperature showcase of FIG. 1;

FIG. 3 is a front view of a cooler of the low-temperature showcase of FIG. 1;

[Explanation of symbols]

 R Low-temperature showcase 1 Cooler 2 Insulating wall 4 Cooling device 5 Blind circuit 8, 9 Brine piping 10 Brine pipe 11A Connector 12 Air vent pipe 13 Insect valve 14 Duct 21 Heat exchanger

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masamichi Ishikawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. (Reference) 3L045 AA06 BA01 CA02 DA02 EA01 FA02 PA03 PA04

Claims (4)

[Claims] 1. A low temperature showcase for circulating and cooling brine cooled by a cooling device to a cooler, wherein an air bleeding pipe is attached to communicate with an uppermost portion of a brine pipe constituting the cooler. Low temperature showcase. 2. The low-temperature showcase according to claim 1, wherein the air vent pipe extends to the vicinity of the deck pan. 3. A valve with a bug attached to a tip of an air vent pipe.
Low temperature showcase. 4. The low-temperature showcase according to claim 1, wherein the brine is circulated from an upper portion to a lower portion of the cooler.