JP3290309B2 - Piping structure of refrigerated showcase - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external piping structure of a refrigerant pipe of a freezing and refrigerated showcase installed in a store such as a supermarket in a row.

[0002]

2. Description of the Related Art Conventionally, as a piping structure of a refrigerant pipe of this type of freezing and refrigeration showcase, there is one disclosed in Japanese Patent Application Laid-Open No. 3-221773. FIG. 4 shows one of the embodiments disclosed in the publication, in which one of a plurality of showcases connected and installed at the same place is connected in parallel to a condensing unit installed outside the showcase to operate. 2 shows a piping structure of a refrigerant pipe in the case of performing the above. In the figure, a high-pressure pipe 9 drawn out from a cooler 7 previously incorporated in a showcase body is attached to one of a plurality of showcases 1.
The low-pressure pipe 10 is routed around the side space of the cooler 7 inside the main body of the showcase 1, and then is set up from its rear end, and its upper end penetrates the heat insulating wall of the ceiling of the showcase main body. It sticks out of the showcase. The refrigerant connection pipe 9 drawn from the cooler 7 of another showcase using the high-pressure pipe 9 and the low-pressure pipe 10 as a common pipe.
a and 10a are connected in parallel to the high-pressure pipe 9 and the low-pressure pipe 10, respectively.

[0003] In this case, the connection of each pipe is connected by welding such as brazing.

On the other hand, the upper ends of the high-pressure pipes 9 and the low-pressure pipes 10 protrude out of the showcase through the heat-insulating walls of the ceiling of the plurality of juxtaposed showcase bodies, and the heat-insulating walls of the ceiling of the adjacent showcases. There is known a piping structure in which the pipes projecting through the pipe are connected at the upper surface of a showcase using a T-shaped connecting pipe. In this example, T
The lower end of the T-shaped connecting pipe is welded to the high-pressure or low-pressure pipe, and the side ends are aligned with the opposite side ends of the adjacent T-shaped connecting pipe and welded and joined to each other. The refrigerant pipes are connected integrally.

[0005]

As described above, conventionally, when connecting refrigerant pipes of a plurality of refrigerator-freezer showcases juxtaposed to each other and piping them to a condensing unit installed outside, a high-pressure pipe installed in one of them is used. Since the lower part of the pipe and the low-pressure pipe and the refrigerant connection pipe drawn from the cooler of the adjacent showcase are welded below the showcase, piping work has been extremely difficult.

That is, when welding each pipe, the worker must remove the front panel covering the front part at the lowermost part of the showcase, bend down and insert his hand through the front opening to perform the work. The sex was extremely bad. Furthermore, since refrigeration equipment such as a cooler and a blower for circulating cool air is installed near the connection point of each pipe,
There was a problem that the location and the welding position of the refrigerant connection pipe drawn out from the cooling pipe of the adjacent showcase could not be freely selected, and there was a problem that these refrigeration equipment was restricted.
In addition, welding must be performed for each refrigerant pipe, and the number of welding points is large and the work time is long.

On the other hand, the upper end of the high-pressure pipe and the low-pressure pipe are protruded through the heat insulating wall of the ceiling for each showcase, and the refrigerant pipe of each showcase is connected to the upper surface of the showcase using a T-shaped connecting pipe. In the piping structure to be connected, although the problem of being restricted by these refrigeration equipment because the welding position as described above cannot be freely selected is solved, welding is performed using a T-shaped connecting pipe for each showcase. Must be
There has been a problem that the number of parts involved in the welding work increases and the number of welding points also increases, so that the working time increases. In addition, the space between the top of the showcase, which is the piping location, and the ceiling in the store is very narrow, and here welding parts must be machined on site to perform ceiling piping and many welding operations. There was a need for improved efficiency. The present invention has been made in order to solve such a problem, and provides a piping structure having a small number of welding points and good workability in piping work in an external piping structure of a refrigerant pipe of a refrigerated showcase. It is.

[0008]

According to the present invention, in order to achieve the above-mentioned object, a refrigerator for exchanging heat with a refrigerant is built in a refrigerator-refrigeration equipment body such as a refrigerator-freezer showcase or a refrigerator-freezer. An upper end of a high-pressure pipe, which is a liquid refrigerant pipe, and a lower-pressure pipe, which is a suction pipe, drawn out from a cooler, penetrates the upper wall of the showcase, and projects outside the showcase. A plurality of showcases are arranged in a row, and a pre-molded bridge portion that is bridged over the upper wall of each showcase and a connection that is provided in the bridge portion and that is connected to each projecting pipe of each showcase. And a transition piping unit for high pressure piping and a transition piping unit for low pressure piping.

[0009]

According to the structure of the present invention, since each projecting pipe of the adjacent freezer and refrigerated showcase is integrally connected by the previously integrated crossover piping unit, the refrigerant pipe at the installation site of a plurality of showcases. At the time of piping work, by simply welding the projecting pipe of each showcase and the connection part of the crossover piping unit provided at a predetermined interval opposed thereto,
This has the effect that the refrigerant pipe of each showcase can be connected to the condensing unit.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The embodiment shown in FIG. 1 is a cold air circulation type open showcase, wherein 1 is a showcase main body, 2 is a product display room in which a plurality of product display shelves 2a are arranged, and 3 is a product display room 2 in the showcase main body. 4 and 5 are cool air circulation blowers attached to the upper and lower parts of the cool air circulation path, respectively.
Is a heat insulating wall constituting the outer wall of the showcase body 1, and the inside is filled with a heat insulating material made of urethane foam. 7 is a cooler housed in the cool air circulation path, 9 and 10 are a high pressure pipe and a low pressure pipe drawn out from the cooler, and the inside of the cool air circulation path 3 on the back side of the commodity display room 2 is above the showcase. It has been launched towards. Each pipe is connected to a condenser and a compressor incorporated in an external condensing unit (not shown) via transition pipes 11 and 12 described later, and a refrigerant for heat exchange is circulated in the pipe.
Here, in the high-pressure pipe, a high-pressure liquid refrigerant that has been compressed by the compressor and then radiated by the condenser flows toward the cooler. On the other hand, in the low-pressure pipe, low-pressure refrigerant that has absorbed heat and been vaporized by the cooler flows toward the suction port of the compressor (not shown). Also, the upper ends of the high-pressure pipe 9 and the low-pressure pipe 10, that is, the portions projecting out of the showcase through the upper surface wall 6a of the showcase body are defined as projecting pipes 9a and 10a.

Next, the transfer pipe according to the present invention will be described with reference to FIGS. Numeral 13 denotes a piping sleeve incorporated in the penetrating portion of the heat insulating material on the upper wall 6a of the showcase, and projecting pipes 9a, 10a piped through the sleeve.
Are drawn out of the showcase and upwards. The connecting pipe connecting these protruding pipes is a bridge section 1 bridged over each upper wall of a showcase in which a plurality of connecting pipes are arranged side by side.
1a and 12a, and connecting portions 11b and 12b provided on the bridge portion and welded to the protruding pipe. Each of the two bridge portions 11b, 12b of the high-pressure transfer pipe 12 and the low-pressure transfer pipe 11 is formed by cold-drawing a copper material into a tubular shape, and has a slightly larger diameter than the protruding pipe. ing. The connecting portion is formed by drawing out a branch pipe having a slightly smaller diameter from the bridge portion as shown in the embodiment of FIG. 3, but the projecting tube fits into the bridge portion without providing such a branch tube. An opening may be provided. In the case of a branch pipe, the tip and the protruding pipe are fitted together, and the fitting portion is connected by welding, but in the case of an opening, the fitting portion between the opening and the protruding pipe is welded and joined. Be linked. In addition,
The branch pipe drawn from the bridge portion 11a of the low-pressure crossover pipe 11 or the protruding pipe 10a connected thereto may be formed in a trap pipe shape. Thus, it is possible to prevent the refrigerating machine oil and the liquid refrigerant from flowing into the refrigerator side, particularly the compressor, through the low-pressure transfer pipe.

In the embodiment provided with the branch pipe described above,
When connecting the crossover pipe and the protruding pipe, there is an advantage that the actual position can be easily adjusted. Further, in the embodiment having only the opening, when the showcase is installed in the store, even when the distance between the upper wall of the showcase and the ceiling wall of the store is narrow, the branch pipe is unnecessary, so that the space is improved. Therefore, there is an advantage that welding work of each pipe can be easily performed.

The pitch of these connecting portions, that is, the pitch of the branch pipes or the openings is provided so as to face the protruding pipes of the respective showcases. Are equivalent.

Next, the procedure for installing the crossover pipe according to the present invention will be described. The showcases carried into a store such as a supermarket are arranged side by side on a wall in the store. The shape, specifications, etc. of the showcase to be installed are standardized in advance, and the height and depth width of the adjacent showcase are the same, so the location of the protruding pipe drawn out on the upper wall of the showcase is also horizontal. The pitch becomes even in one line. In addition, adjacent showcases are fixed by a predetermined connection fitting or the like.

An operator carries a crossover piping unit having a length substantially equal to the lateral width of the juxtaposed showcases on the upper wall of each showcase, and connects a connecting portion provided at a bridge portion of the crossover pipe to the showcase. After positioning with the protruding tube, only the positioning portion is welded and connected. Thereby, the refrigerant pipe of each showcase and the external condensing unit can be integrally connected.

The cooling operation of the piping structure of the showcase thus installed will be described. During cooling of the showcase product display room 2, the compressor and the condensing unit separately provided outside the showcase body and the blowers 4 and 5 in the showcase are operated so that the condensing unit of the refrigerator has a high temperature. Then, the high-pressure refrigerant liquid flows into the high-pressure transfer piping unit 12 via the refrigerator-side piping (not shown). Such refrigerant liquid is supplied to the protruding pipe 9a.
Is supplied to the high-pressure pipe 9 and supplied to the cooler 7 through the expansion valve. Further, the refrigerant gas that has absorbed heat from the air in the cool air circulation path 3 and evaporated in the cooler 7 is sent out to the low-pressure pipe 10 and returned to the compressor and the condensing unit again through the low-pressure transfer pipe 11 from the protruding pipe 10a.

On the other hand, on the showcase side,
A cold air curtain A is blown out of the front opening of the showcase body 1 through the through-hole, thereby keeping the products placed on the product display shelf 2a cool. The cool air circulation in the cool air circulation path 3 is performed by the blowers 4 and 5.

[0018]

As described above, according to the structure of the present invention, in order to integrally connect the refrigerant pipes of a plurality of showcases arranged side by side, a crossover pipe unit integrally molded above the upper wall of each showcase is preliminarily formed. The bridge section is laid, and the projecting pipe of each showcase is welded to the connecting section provided at the bridge section of the crossover piping unit.This reduces the number of welding points at the showcase installation site and improves workability. Is improved. In addition, since the number of welding locations is reduced, the risk of refrigerant leakage is reduced, so that the reliability for refrigerant leakage is improved.

Further, since the piping work is performed outside the showcase body, the location of the refrigerant connection pipe and the welding position can be freely selected, and the working environment is improved and the welding time can be shortened. . Along with this, standardization of the welding work is achieved, so that the working time and the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a showcase according to the present invention.

FIG. 2 is a perspective view showing a piping structure of a showcase according to the present invention.

FIG. 3 is a front view showing a piping structure of a showcase according to the present invention.

FIG. 4 is a configuration diagram showing a piping structure of a conventional showcase.

[Explanation of symbols]

1 showcase body, 2 product display room, 2a product display shelf, 3 cool air circulation path, 4,5 blower, 6 insulation wall,
6a top wall, 7 cooler, 9 high pressure pipe, 9a, 10
a Projecting pipe, 10 Low pressure pipe, 11 Low pressure crossover pipe, 1
1a low-pressure side bridge, 11b low-pressure side connection, 12 high-pressure crossover pipe, 12a high-pressure side bridge, 12b high-pressure side connection, 13 piping sleeve

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-201251 (JP, A) Japanese Utility Model Showa 61-3386 (JP, U) Japanese Utility Model Showa 59-132043 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) F25D 19/00 510 F25D 23/00 304 F25D 11/00 101 A47F 3/04

Claims (1)

(57) [Claims] 1. A refrigerator having a built-in cooler in a showcase main body, and upper ends of a low-pressure pipe and a high-pressure pipe drawn from the cooler penetrating an upper wall of the showcase and protruding outside the showcase to form a protruding pipe. In the refrigerated showcase, a plurality of the frozen and refrigerated showcases are arranged in parallel, and a bridge portion bridged above the upper wall of each showcase and
With each projecting pipe of each showcase provided in the bridge section
A piping structure for a freezer and refrigerated showcase, comprising a pre-molded crossover piping unit comprising a connecting portion to be connected .