JP2689996B2 - Evaporator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an evaporator. More specifically, in the evaporator according to the present invention, the cooling flow path surrounds the cooling chamber of the compression cooling device that operates by using hydrocarbon as a cooling medium and is surrounded by the heat insulating layer on the outside. A wall extending in a curved shape between two metal plates consisting of an inner metal plate and an outer metal plate, having a cooling medium inlet and an outlet, beside the cooling medium flow passage region and between the regions. The two metal plates have a strong metal bond with each other in a welded or brazed state.

An evaporator with the above mentioned features is known from DE-A-1 426 923. However, the known evaporators have no additional protection against leakage damage. Additional protection against leakage is known in heat exchangers, especially in "Roll-Bond" type heat exchangers (US-A-4).
678027 and EP-A-0 206 416).

To form the cooling chamber, the evaporator usually re-forms a flat evaporator sheet bar to form at least four walls of the evaporation chamber,
For example, make a frozen wall, but often make a back wall. These evaporator sheet bars by the so-called roll-bond method and their production are illustrated in DE-C-1552 044. In the roll-bond method, both positions of the sheet bar are joined to each other by roller welding (Walzverschweissung) while stretching the base material, so that the separation layer made of a material that prevents welding determines the extension direction of the cooling medium flow path later. Precisely demarcated and fed to the sheet bar. This technique is described, for example, in DE-C-1 920 424.

In the past, only hydrocarbons (FCKW) were used as the cooling medium, but newer cooling devices use isobutane, isopropane or propane-butane. Since these hydrocarbons form an ignitable mixture with air, they are now often equipped with pre-ex-protected electrical equipment in the cold room area. at the same time,
Additional measures are also taken to prevent the cooling medium from leaking especially towards the cooling chamber.

The object of the present invention is to reduce the risk of leakage of the cooling medium in the evaporator described at the beginning without significant loss of cooling capacity.

According to the invention, an additional inner wall plate provided on the cooling chamber side forms the inner wall of the cooling chamber evaporation wall and is in metal surface contact with the inner metal plate, inside the surface contact area between the inner wall plate and the inner metal plate. Has a joint surface by a welding method or brazing, and a thin separation layer is provided between the inner wall plate and the inner metal plate between the adjacent joint surfaces, and the separation layer extends in the bending extension direction of the cooling medium passage. An evaporator is provided which is conformably bent and extended, but is wider than the cooling medium flow path.

Specific examples of the invention are set forth in the dependent claims. For example, according to the first embodiment, the joint surface between the inner wall plate and the inner metal plate is
Confined to striped or striped planar areas distributed on the evaporation wall.

Another embodiment of the invention is that an additional outer wall plate forming the outer wall of the evaporator is provided along the separating layer and has a metal surface contact with the outer metal plate and a surface contact between the outer wall plate and the outer metal plate. In an evaporator having a joining surface by welding or brazing inside the region, a thin outer separating layer is provided between the outer wall plate and the outer metal plate between adjacent outer joining surfaces. An additional safety measure is provided, characterized in that it is bent to extend in conformity with the bending extension direction of the cooling medium flow path, but is wider than the cooling medium flow path.

As with the inner safety measure, it is preferable to take a safety measure in which the outer joint surface between the outer wall plate and the outer metal plate is restricted to the striped or island-shaped planar areas distributed on the evaporation wall.

A strong metal bond between the inner metal plate and the outer metal plate is made by the roller welding method after roll bonding, and the cooling medium flow path is the inner side in the evaporator that swells the non-welded area before the shape forming of the evaporator. The joint surface between the wall surface and the inner metal plate is made in the same operation as the roller welding of the inner metal plate and the outer metal plate.

The problem set according to the invention is solved in a simple manner. When using the addition for the inner wall plate and, optionally, the additional plate for the outer wall plate, it is possible to use, for example, 3 by the roll bond method.
Welding at one or four locations can be performed simultaneously on existing equipment in the same operation, with no additional finishing costs.

Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings. These are schematic illustrations. Fig. 1 is an evaporator of a compressor cooling device, Fig. 2 is a sectional view of a compressor wall, and Fig. 3 is a plan view of the compressor wall. FIG. 4 is a perspective view of a cross section of the compressor wall body.

The compressor 1 shown in FIG. 1 has four compressor walls 2, which are formed by bending corresponding large compressor sheet bars. The evaporator is surrounded on the outside by an insulating layer 3 of which only a cross section is shown. The rear boundary of the cooling chamber 4 is usually defined by a back wall not shown in detail.

The structure in which the evaporator wall 2 is partially shown in section can be seen clearly from FIG. The evaporator wall 2 is composed of an inner metal plate 5, an outer metal plate 6 and an inner wall plate 7. There is a cooling medium passage 8 between the inner metal plate 5 and the outer metal plate 6. Cooling medium flow path 8
Has a cooling medium inlet 9 and a cooling medium outlet 10 as shown in FIG.

Further, as shown in FIG. 2, the inner metal plate 5 has strong metal joints 11 with the outer metal plate 6 on both sides of the cooling medium channel 8. This joint is a welded state in the drawing and is shown larger than the actual ratio for the sake of clarity.
In the cooling medium flow path itself, a separating layer 12 is shown, which makes it possible to blow in the cooling medium, which separating layer is also shown larger than it actually is.

There are joint surfaces 13 and 13a between the inner metal plate 5 and the inner side wall plate 7, and these joint surfaces are formed by the welding method in the drawing.
And it is also shown to be larger than the actual percentage. Joining surface 13
The separation layer 14 is provided between the first and the second layers 13a and 13a.

FIG. 3 shows the evaporator wall 2 shown in FIG. 2 but having a wall structure without a separating layer. The cooling medium flow path 8 has its boundary shown by a solid line and extends substantially on a bend. In the enlarged bending region, a circular or elliptical strong metal joint 11 is formed as a starting shape.
Here, the cooling medium flow path 8 is correspondingly diverged as shown by the chain line.

A pair of dotted lines indicate the edges of the separation layer 14, and the separation layer 14 extends in a bent shape corresponding to the dotted lines. It can be seen that the separation layer 14 is wider than the cooling medium channel 8.

FIG. 4 is a perspective view showing a cross section of the separation wall 2. The separation layer 2 comprises an inner wall plate 7, an inner metal plate 5, an outer metal plate 6 and an outer wall plate 15.

In such an evaporation wall body 2, the inner wall plate 7 and the outer wall plate
Fifteen is made of aluminum (Al99.5%), each of which could have a thickness of 0.6 mm.

The inner metal plate 5 is made of zirconium-containing aluminum (AlZr) having a thickness of 0.2 and 0.6 mm. Furthermore, the thickness is 0.
The 5 mm outer wall plate 6 is made of aluminum (Al99.5).
Between the outer joint surfaces 17 adjacent to each other and the outer wall plate 15 and the outer metal 6
A thin outer separating layer 16 is provided between them, which separating layer 16 is likewise bent in conformity with the bent extension of the cooling medium channel 8. However, the separation layer 16 is wider than the cooling medium flow path.

The joint surface 17 between the outer wall plate 15 and the outer metal plate 6 is made by the same operation as the roller welding between the inner metal plate 5 and the outer metal plate 6.

Front Page Continuation (72) Inventor Stenber, Herbert Germany Day-58791 Beldor Feldstraße 24 (72) Inventor Former, Geld Germany Day-57462 Olpeeich Hernchenbeg 16 (56) Reference JP-A-55- 99593 (JP, A)

Claims (6)

(57) [Claims] 1. A cooling medium flow path (8) surrounds a cooling chamber (4) of a compression cooling device operating with a hydrocarbon as a cooling medium,
It is surrounded by a heat insulating layer (3) on the outside, and is composed of an inner metal plate (5) and an outer metal plate (6) of the evaporator wall.
An evaporator comprising a cooling medium passage (8) having a cooling medium inlet (9) and an outlet (10) extending in a bent shape between a plurality of metal plates, the side of the cooling medium passage area being provided. In addition, the two metal plates (5, 6) between the areas have a strong metal connection (11) to each other by welding or brazing. Inner wall plate (7) forms the inner wall of the cooling chamber evaporation wall and is in metal surface contact with the inner metal plate (5), inside the surface contact area between the inner wall plate (7) and the inner metal plate (5). Joining surface by welding or brazing (13,13
a), and a thin separation layer (14) is provided between the adjoining joining surfaces (13, 13a) between the inner wall plate (7) and the inner metal plate (5), and the separation layer (14) ) Is a cooling medium flow path (8)
An evaporator which is curved in conformity with the curved extension direction of, but is wider than the cooling medium channel (8). 2. The joint surface (13) between the inner wall plate (7) and the inner metal plate (5) is limited to striped or island-shaped flat areas distributed on the evaporation wall surface. The evaporator according to claim 1, wherein 3. An additional outer wall plate (1) forming the outer wall of the evaporator.
5) is provided along the separation layer and is in metal surface contact with the outer metal plate (6), and is welded inside the surface contact region between the outer wall plate (15) and the outer metal plate (6) or In an evaporator provided with a joining surface (17) by a brazing method, a thin outer separating layer (16) is formed between the outer wall plate (15) and the outer metal plate (6) between adjacent outer joining surfaces (17). The separation layer, which is provided between the cooling medium flow passages (8) and the bending direction of the cooling medium flow passage (8), is wider than the cooling medium flow passage (8). The evaporator according to claim 1 or 2. 4. The outer joint surface (17) between the outer wall plate (15) and the outer metal plate (6) is restricted to a striped or island-shaped flat area distributed on the wall surface of the evaporator. The evaporator according to claim 3, which is characterized in that. 5. A strong metal joint between an inner metal plate (5) and an outer metal plate (6) is made by welding using a roller welding method after roll bonding, and a cooling medium flow path (8).
In an evaporator made by bulging a non-welded area before shaping the evaporator, a joint surface (13, 13) between the inner wall plate (7) and the inner metal plate (5) is provided.
Evaporator according to claim 1 or 2, characterized in that a) is made in the same operation as roller welding of the inner metal plate (5) and the outer metal plate (6). 6. The joint surface (17) between the outer wall plate (15) and the outer metal plate (6) has an inner metal plate and an outer metal plate (5 to 6).
The evaporator according to claim 5, wherein the evaporator is manufactured by the same operation as the roller welding of.