JP2755294B2 - Refrigerated display case - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art First, FIG. 6 shows a configuration of a refrigerator-refrigerated 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, 1 is a case main body, 2 is a product display room in a warehouse equipped with a display shelf 2a, 3 and 4 are inner and outer double inners surrounding the product display room 2 and defined inside the case main body 1, and Outer cool air circulation ducts, 5 and 6 are blower fans housed in cool air circulation ducts 3 and 4, 7 is a cooler installed in inner cool air circulation duct 3, 8 is a condensin of a refrigerator separated and separated from case body 1. The cooling units 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.

In such a configuration, the condensing unit 8 of the refrigerator is operated by operating the condensing unit 8 of the refrigerator and the fans 5 and 6 when the showcase is kept cool.
The high-temperature, high-pressure refrigerant liquid is sent through the refrigerant liquid pipe 9 and supplied to the cooler 7 through the expansion valve 11. The refrigerant gas evaporated in the cooler 7 returns to the condensing unit 8 through the suction pipe 10.

On the other hand, on the showcase side, two layers of inner and outer cold air curtains A and B are blown out at 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. Is done. By the way, when such a refrigerated showcase is installed and operated in a large store or the like in an urban area, a recent tendency is to install a condensing unit for a refrigerator on the roof of a building in view of noise, installation space, and the like. In many cases, a piping system is used in which a refrigerant connection pipe is used to connect a showcase installed in a store downstairs.

At present, such a condition for installation is conventionally dealt with by adopting a piping structure as shown in FIG. 7 between a showcase and a condensing unit of a 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, etc., sends the liquid from the condensing unit 8 to the floor of the showcase installation location in the store, and connects the refrigerant connection pipes 13, 14 on the suction side to the wall surface of the building. Along the plumbing,
After the showcase is carried into a predetermined position in the store and installed, the front ends of the pipes 13 and 14 already bent are bent and inserted into the inside of the case body 1 from the bottom side, and the liquid pipe 9 and the suction described above are sucked into the case. It is connected to the tube 10 in a squirrel-cage manner, and further brazed so as to be interconnected.

[0007] Since dew condensation occurs on the pipe surface of the refrigerant connection pipe 13 on the suction side through which the low-temperature refrigerant gas flows, the heat insulating material 1 extends over the entire length of the connection pipe 13 during pipe construction.
5 is wound around.

[0008]

However, the conventional piping structure shown in FIG. 7 has the following problems in terms of the piping work at the installation site and the space for installing the showcase. (1) Since the external refrigerant connection pipes 13 and 14 piped inside the store are piped to the back side of the showcase, the case main body 1 cannot be pressed against the wall surface of the building 12 without gaps and installed. It is necessary to keep the space D away from the wall surface. As a result, a useless blind spot space remains between the showcase and the wall of the building, and the installation occupation area of the showcase increases accordingly.

(2) If gas leaks or the like occurs in the refrigerant connection pipes 13 and 14 piped inside the store after the installation of the showcase, repair work on the pipes is performed unless the showcase itself is moved and retracted. Can not do. (3) Since the refrigerant connection pipes 13 and 14 laid in 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 from the case body need to be piped. It is troublesome.

The present invention has been made in view of the above points, and has been installed by improving a piping structure of a refrigerant liquid pipe and a suction pipe previously piped into a case body drawn from a cooler built in a showcase. A refrigerated showcase, especially its refrigerant, which makes it easy to install refrigerant connection pipes on site and allows the showcase to be installed without leaving an unnecessary blind space between the building wall and the back of the showcase An object of the present invention is to provide a pipe piping structure.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a refrigerating and refrigerated showcase which incorporates a cooler in a duct of a case body and is used in combination with a separate refrigerator condensing unit. The refrigerant liquid pipe and the suction pipe drawn out from the cooler are drawn into the case body to be set up and piped, and the upper end thereof penetrates the ceiling wall of the case body and protrudes to the outside. Is filled with nitrogen gas under pressure, and the tube end is covered with a sealing cap.

[0012] With this configuration, the refrigerant liquid pipe and the suction pipe having the above-described configuration are piped into a case body shipped from a factory in advance and installed in the case body. There is no need to lay the refrigerant connection pipe between the refrigerator condensing unit and the floor through the back of the showcase to the floor, and the refrigerant liquid pipe, suction pipe, and the top of the showcase that have been piped in the showcase in advance. Can be interconnected on the side. 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.

[0013] In addition, by injecting nitrogen gas into the piping system under pressure, moisture can be prevented from entering the piping system before the installation of the showcase, and after the showcase is carried into the installation site, By checking the presence or absence of gas blowing when the sealing cap is removed, the soundness 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.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In each drawing, the same members corresponding to FIG. 7 are denoted by the same reference numerals. First, FIGS. 1 to 3
, The refrigerant liquid pipe 9 and the suction pipe 10 drawn from the cooler 7 built in the case body 1 of the showcase
After the side space of the cooler 7 is routed inside, the pipe is raised upward from its rear end, and its upper end penetrates the heat insulating wall of the ceiling of the case body 1 and protrudes out of the case.

The refrigerant liquid pipes 9 and 9 are provided inside the case body 1.
In order to secure a piping space for the suction pipe 10, in particular in the illustrated example, as shown in FIG. 3, a partition is made according to the length of the cooler 7 of the outer cool air circulation duct 4, and a piping space is provided on the side thereof. I try to define. With this configuration, the refrigerant liquid pipe 9 and the suction pipe 10 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.

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 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 part is sealed with a caulking material. Like that. 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 put on the pipe end. The periphery is covered with a heat insulating material 17 above.

Reference numeral 20 denotes a binding band for clamping 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 protected refrigerant liquid pipe 9 and 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 location are connected in parallel to one condensing unit 8 for operation. That is, as described in the above embodiment, the refrigerant liquid pipe 9 and the suction pipe 10 are set up in one of the plurality of showcases in advance as described in the above embodiment, so that the refrigerant Cooler 7 for each showcase with pipes as common pipes
Can be connected in parallel, thereby simplifying the piping work at the installation site.

In this case, the refrigerant liquid pipe 9 and the suction pipe 1
Since the flow rate of the refrigerant flowing to zero increases, the pipe diameter is selected in advance according to the number of parallel showcases.

[0021]

According to the present invention, the refrigerated showcase is
The configuration described above has the following effects. (1) There is no need to route an external refrigerant connection pipe installed between the refrigerator and the condensing unit installed separately at the installation site of the showcase to the floor surface through the back 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 installed inside the store and repair is required, repair work of the pipe can be performed without moving the showcase. (3) 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.In addition, after the showcase is brought into the installation site, the sealing cap 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.

As described above, it is possible to provide a refrigerated showcase that is advantageous in terms of installation space and piping work when the showcase is installed on site.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a configuration according to an embodiment of the present invention.

FIG. 2 is a front view of a peripheral portion of the cooler in FIG. 1;

FIG. 3 is a plan view of a peripheral portion of the cooler in FIG. 1;

FIG. 4 is a piping structure diagram of a ceiling wall penetration part of a showcase main body.

FIG. 5 is a piping diagram of an application example in which a plurality of showcases are connected and used.

FIG. 6 is a sectional view showing the configuration of a two-layer air curtain cold air circulation type open showcase.

FIG. 7 is a piping structure diagram of a conventional refrigerant pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case main 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 18 Dry nitrogen gas 19 Sealing cap

Claims (1)

(57) [Claims] 1. A refrigerating and refrigerated showcase which incorporates a cooler in a duct of a case body and is used in combination with a separate refrigerator condensing unit, wherein a refrigerant liquid pipe and a suction pipe drawn out of the cooler are used in the case body. And the upper end thereof penetrates through the ceiling wall of the case body and protrudes to the outside, and pressurizes and seals nitrogen gas into the refrigerant liquid pipe and the suction pipe, and has a pipe end. A refrigerated showcase characterized by a sealed cap.