JP2639152B2 - Refrigerated display case - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating and refrigerated showcase for a cold air circulation type showcase and the like, and more particularly to a piping structure of a refrigerant pipe provided in the showcase.

[Conventional technology]

First, FIG. 6 shows the configuration of a refrigerator-freezer showcase to which the present invention is applied. The illustrated example is a cold air circulation type open showcase with a two-layer air curtain. In the figure, reference numeral 1 denotes a case body, 2 denotes a product display room in a refrigerator equipped with a display shelf 2a, and 3 and 4 surround the product display room 2. The inner and outer double inner and outer cool air circulation ducts defined inside the case main body 1, the blower fans 5 and 6 accommodated in the circulation ducts 3 and 4, and the cooler 7 installed in the inner cool air circulation duct 3 , 8
Is a condensing unit of a refrigerator separately provided from the case body 1, 9 and 10 are refrigerant liquid pipes and suction pipes drawn from the cooler 7, and 11 is an expansion valve connected to the inlet of the cooler.

By operating the condensing unit 8 and the fans 5 and 6 of the refrigerator at the time of keeping the showcase cool in such a configuration, high-temperature, high-pressure refrigerant liquid is sent from the condensing unit 8 of the refrigerator through the refrigerant liquid pipe 9, It is supplied to the cooler 7 through the expansion valve 11. The refrigerant gas evaporated in the cooler 7 passes through the suction pipe 10 to the condensing unit 8.
Reflux.

On the other hand, on the showcase side, two layers of inner and outer cold air air curtains A and B are formed in the front opening of the case body 1 through the cool air circulation ducts 3 and 4, thereby keeping the products displayed in the refrigerator cool.

By the way, when installing and operating such a refrigerated showcase in a store such as a large store in an urban area, a recent tendency is to install a condensing unit of a refrigerator on the roof of a building in view of noise and installation space.
In many cases, a piping system is used in which a refrigerant connection pipe is used to connect to a showcase installed in a store downstairs.

Conventionally, such installation conditions are conventionally handled by adopting a piping structure as shown in FIG. 7 between the showcase and the condensing unit of the refrigerator. That is, in the conventional refrigerated showcase, a short refrigerant liquid pipe 9 and a suction pipe 10 drawn in advance from the cooler 7 for a product shipped from a factory are piped to the bottom side of the case body 1.

Therefore, at the installation site of the showcase, before the showcase is carried in, the condensing unit 8 of the refrigerator installed on the roof of the building 12 or the like is connected to the floor of the showcase installation location in the store to connect the liquid supply and refrigerant connection on the suction side. Pipes 13 and 14 are piped along the wall of the building, the showcase is carried into a predetermined position in the store, and after installation, the connection pipes 13 and 14 that have been piped are bent at the tip and the case body is bent from the bottom side. 1 and is connected in a case with the liquid pipe 9 and the suction pipe 10 in the case, and further brazed to interconnect them.

The refrigerant connection pipe 13 on the suction side through which the low-temperature refrigerant gas flows.
Therefore, the heat insulating material 15 is wound around the entire length of the connecting pipe 13 at the time of piping construction because dew condensation occurs on the pipe surface.

[Problems to be solved by the invention]

By the way, the conventional piping structure shown in FIG. 7 has the following problems in terms of the piping work at the installation site and the installation space for the showcase.

(1) Since the external refrigerant connection pipes 13 and 14 piped inside the store are piped on the back side of the showcase, the case body 1
Cannot be installed by pressing against the wall surface of the building 12 without any gap, and it is necessary to separate the pipe space D forward from the wall surface. Therefore, a useless blind spot space remains on the side of the showcase and the wall surface of the building, and the installation occupation area of the showcase increases accordingly.

(2) If gas leaks occur in the refrigerant connection pipes 13 and 14 installed inside the store after installation of the showcase, repair work on the piping cannot be performed unless the showcase itself is moved and retracted. .

(3) Since the refrigerant connection pipes 13 and 14 laid inside the store are routed to the bottom side of the showcase, in order to avoid interference with the connection pipes, the drainage drain pipes drawn out of the case body need to be constructed. It is troublesome.

The present invention has been made in view of the above points, and improves the piping structure of a refrigerant liquid pipe and a suction pipe previously piped in a case body drawn out from a cooler built in a showcase, thereby making it possible to improve the piping at the installation site. A refrigerated showcase that facilitates installation of refrigerant connection pipes and that can be installed without leaving an unnecessary blind space between the wall of the building and the back of the showcase, especially piping for the refrigerant pipes The purpose is to provide a structure.

[Means for solving the problem]

In order to solve the above-mentioned problems, the present invention provides: 1) a refrigerator in which a cooler is incorporated in a duct of a case body and used in combination with a separate refrigerator condensing unit; The pipes are partitioned according to the dimensions, a piping space is defined on the sides thereof, and a refrigerant liquid pipe and a suction pipe drawn out from the cooler are drawn into the piping space to be set up and piped, and the upper end thereof is a case. It is configured to penetrate the ceiling wall of the main body and protrude outside the case.

2) In a refrigerated showcase that incorporates a cooler in the duct of the case body and is used in combination with a separate refrigerator condensing unit, the duct is partitioned according to the length of the cooler, and piping is arranged on the side. A space is defined, and a refrigerant liquid pipe and a suction pipe drawn from a cooler are drawn into the piping space to be set up and piped, and the upper end of the pipe projects through the ceiling wall of the case body and protrudes outside the case. In addition, a piping sleeve is buried in a penetrating portion of the heat insulating panel on the ceiling wall, covered with a heat insulating material so as to fill a gap between the piping sleeve and the piping, and a penetrating portion is sealed. is there.

3) In the refrigerated showcase described in 1) or 2) above, nitrogen gas is pressurized and injected into the refrigerant liquid pipe and the suction pipe, and the pipe ends are covered with a sealing cap.

[Action]

In the case of a showcase product shipped from a factory, the refrigerant liquid pipe and the suction pipe having the above-described configuration are previously piped and incorporated in the case body, so that the installation of the showcase can be connected to the refrigerator condensing unit. There is no need to lay the refrigerant connection pipe laid between the floor and the floor through the back of the showcase, and it is possible to interconnect the refrigerant liquid pipe and the suction pipe that have been piped in the showcase in advance on the upper side of the showcase. Therefore, it is possible to install the showcase by pressing it against the wall of the building without leaving a piping space between it and the wall of the building. Even if repair work is required, the work can be performed without moving from the place where the showcase itself was installed.

Further, the refrigerant liquid pipe and the suction pipe can be started up without penetrating the cool air circulation duct.

Furthermore, dew does not seep into the case from the outside through the pipe penetration, and the refrigerant liquid pipe and suction pipe protruding from the ceiling wall of the case body when transported from the factory to the site can be protected. By pressurizing and filling nitrogen gas into the system, moisture can be prevented from entering the piping system before the installation of the showcase, and when the sealing cap is removed after the showcase is carried into the installation site. By checking the presence or absence of gas blowout, the integrity of the piping system in the case against gas leakage can be confirmed.

In addition, as for the refrigerant suction pipe installed inside the case body, the dew formed on the pipe surface can be drained from the case body as drain water together with defrost water, etc. And the external refrigerant connection pipe is not routed to the bottom side of the case main body, so that the drain drain pipe drawn from the case main body can be freely piped without interference with the refrigerant connection pipe.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, the same members corresponding to FIG. 7 are denoted by the same reference numerals.

First, in FIG. 1 to FIG. 3, a refrigerant liquid pipe 9 and a suction pipe 10 drawn from a cooler 7 built in a case body 1 of a showcase draw around a side space of the cooler 7 inside the case body 1. Then, the pipe is raised upward from the rear end thereof, and the upper end thereof penetrates the heat insulating wall of the ceiling of the case body 1 and projects outside the case.

In addition, in order to secure a piping space for the refrigerant liquid pipe 9 and the suction pipe 10 inside the case body 1, in particular, in the illustrated example, the outer cool air circulation duct 4 is connected to the cooler 7 as shown in FIG. It is divided according to the size of the pipe, and a piping space is defined on the side. With such a configuration,
The refrigerant liquid pipe 9 and the suction pipe 19 can be set up without penetrating the outer cool air circulation duct 4. The expansion valve 11 is drawn out and connected to a position forward of the cooler 7 in consideration of inspection and maintenance. In this position, the expansion valve 11 can be easily reached by removing the bottom plate 2b of the product display room 2.

Next, FIG. 4 shows a detailed structure of a portion where the refrigerant liquid pipe 9 and the suction pipe 10 penetrate the ceiling wall of the case main body 1.

That is, a piping sleeve 16 is buried in the penetrating portion of the heat insulating panel on the ceiling wall, and the refrigerant liquid pipe 9 and the suction pipe 10 which are set up and piped into the case through the piping sleeve 16 are drawn upward.

The refrigerant liquid pipe 9 and the suction pipe 10 are covered with a heat insulating material 17 so as to fill the gap between the pipe sleeve 16 and the pipe, and the penetrating portion is further sealed with a caulking material. I have.

When the showcase is shipped from the factory, for example, dry nitrogen gas 18 is pressurized and sealed inside the refrigerant liquid pipe 9 and the suction pipe 10 as shown in the figure, and a sealing cap 19 is provided at the pipe end.
And cover the periphery with a heat insulating material 17.

Reference numeral 20 denotes a binding band that clamps the heat insulating material 17.

By applying the above means to the pipe penetration part, dew etc. does not seep into the case from the outside through the pipe penetration part, and it protrudes from the ceiling wall of the case body when transported from the factory to the site The cooled refrigerant liquid pipe 9 and the suction pipe 10 can be protected. In addition, by pressurizing and sealing nitrogen gas into the piping system, it is possible to prevent moisture from entering the piping system before installing the showcase, and to remove the sealing cap after carrying the showcase to the installation site. By checking the presence or absence of gas blowing at the time of the above, the soundness of the piping system in the case against gas leakage can be confirmed.

FIG. 5 shows an application example in which a plurality of showcases connected and installed at the same place are connected in parallel to one condensing unit 8 for operation.

That is, for one of the plurality of showcases,
By setting up the refrigerant liquid pipe 9 and the suction pipe 10 inside the case body 1 in advance as described in the above embodiment, the refrigerant pipes are used as common pipes to cool the coolers 7 of each showcase.
Can be connected in parallel, thereby simplifying the piping work at the installation site.

In this case, since the flow rate of the refrigerant flowing through the refrigerant liquid pipe 9 and the suction pipe 10 increases, the pipe diameter is selected in advance in accordance with the number of parallel showcases.

〔The invention's effect〕

The refrigerated showcase according to the present invention is configured as described above, and has the following effects.

(1) There is no need to route an external refrigerant connection pipe installed between the refrigerator and the condensing unit separately installed at the installation site of the showcase to the floor surface through the rear side of the showcase, and therefore, the showcase Can be installed in the store by pressing it against the wall of the building to save space, and to connect between the refrigerant pipe built into the showcase side and the external refrigerant connection pipe installed inside the store. Work can be done easily.

(2) Even if a gas leak or the like occurs in the external refrigerant connection pipe provided inside the store and repair is required, the repair work of the pipe can be performed without moving the showcase.

(3) The refrigerant liquid pipe and the suction pipe can be set up without penetrating the cool air circulation duct.

(4) Dew and the like do not seep into the case from the outside through the pipe penetration portion, and can protect the refrigerant liquid pipe and the suction pipe protruding from the ceiling wall of the case body when transported from the factory to the site.

(5) By pressurizing and sealing nitrogen gas in the piping system, it is possible to prevent moisture from entering the piping system before installing the showcase, and also to seal the sealing cap after the showcase is carried into the installation site. By checking the presence or absence of gas blowing when the gas is removed, the integrity of the piping system in the case against gas leakage can be confirmed.

Thus, it is possible to provide a refrigerated showcase that is advantageous in terms of installation space and plumbing work when installing the showcase locally.

[Brief description of the drawings]

FIG. 1 is a sectional view of the structure of an embodiment of the present invention, FIGS. 2 and 3 are front and plan views of a peripheral portion of a cooler in FIG. 1, and FIG. FIG. 5 is a piping system diagram of an applied embodiment in which a plurality of showcases are connected and used, FIG. 6 is a cross-sectional view of a double-layer air curtain cold air circulation type open showcase, and FIG. FIG. 2 is a piping structure diagram of a conventional refrigerant pipe. 1: Case body, 7: Cooler, 8: Condensing unit of refrigerator, 9: Refrigerant liquid pipe, 10: Suction pipe, 11: Expansion valve, 12: Building, 13, 14: Refrigerant connection pipe.

Claims (3)

(57) [Claims] 1. A refrigerator according to claim 1, wherein a cooler is incorporated in a duct of a case body and used in combination with a separate refrigerator condensing unit. A piping space is defined between the side and a side wall of the case main body, and a refrigerant liquid pipe and a suction pipe drawn from a cooler are drawn into the piping space to form a startup pipe, and A refrigerated showcase having an upper end protruding out of the case through a ceiling wall of the case body. 2. A refrigerated showcase according to claim 1, wherein a pipe sleeve is buried in a penetrating portion of the heat insulating panel on the ceiling wall, and is covered with a heat insulating material so as to fill a gap between the pipe sleeve and the pipe. A refrigerated showcase characterized by having a penetrated portion sealed. 3. A refrigerated showcase according to claim 1, wherein nitrogen gas is pressurized and injected into the refrigerant liquid pipe and the suction pipe, and a sealing cap is put on a pipe end. Refrigerated showcase.