CN1313785C - Refrigerating appliance comprising a cold wall evaporator - Google Patents

Abstract

A refrigeration device having an insulated outer shell and an inner chamber surrounded by the outer shell. The casing has an inner reservoir (1) and an outer wall, which together form a cavity, and also has an evaporator (5) arranged in the cavity and kept in thermal contact with the vertical wall (3) of the inner reservoir. At least one flat inclined wall surface (6) is arranged between the vertical wall (3) of the inner storage (1) and the top cover (2), and the evaporator (5) extends thereon.

Description

Refrigeration units with cold wall evaporators

technical field

The invention relates to a refrigeration device having a heat-insulated outer shell and an inner chamber surrounded by the outer shell. The housing has an inner reservoir and an outer wall defining a common cavity, and an evaporator disposed within the cavity and in thermal contact with the vertical wall of the inner reservoir. Such evaporators, which are also known and are called cold-wall evaporators, are mainly attached to the outer sides of the inner container.

Background technique

The inner storage device of this kind of refrigeration equipment is mainly made of plastic plate material by deep drawing method. If it is to be drawn from a flat sheet of material that it is essentially cuboid and resembles a receptacle in a refrigeration appliance, the material will be drawn considerably, particularly in the region forming the edges of the inner receptacle. In order to prevent the edges from being broken, the edges are usually rounded, and the radius of curvature of the rounding is 2cm or more. In the rounded area, it is impossible to form an intimate contact between the cold wall evaporator and the inner reservoir, which makes it possible to achieve effective cooling of the inner chamber. Therefore, in conventional refrigeration equipment, it is impossible for the evaporator to extend to the rounded area. As a result, cooling cannot be effected effectively at the upper end of the inner chamber of the refrigerating device, ie at the height of the upper rounding, and undesired temperature differences occur in the inner chamber.

Contents of the invention

The object of the present invention is to provide a refrigeration device with a cold-wall evaporator which reduces temperature differential phenomena in the interior.

In order to solve this task, the invention proposes a refrigeration appliance having a thermally insulated casing with an outer wall and an inner chamber surrounded by the outer casing, the outer covering of the inner chamber being formed by an inner reservoir comprising vertical wall and a top cover adjoining the wall, while the inner chamber is cooled by an evaporator not extending on the top cover, wherein at least A flat sloping wall, the extent of the transition zone includes only a small portion of the wall and roof, and the evaporator extends all the way into the sloping wall.

Thanks to the bevel between the vertical wall and the roof, the evaporator can be arranged at least very close in the transition area between the wall and the roof, thereby improving the cooling effect of the refrigeration unit in the immediate area below the roof, And therefore can significantly reduce the temperature difference phenomenon in its cooling chamber.

In addition, since the temperature drop is lower in the immediate vicinity of the cooling chamber roof, storage conditions are provided for temperature-sensitive refrigerated products.

If the evaporator is arranged on the vertical wall as the rear side of the inner storage, the structure of the inclined wall is particularly preferred in view of the large transition radius from the vertical wall to the top cover.

Therefore, this slope structure can generate the maximum cooling efficiency in the cooling chamber.

With this flat sloping wall, the evaporator can effortlessly maintain a large area in tight contact; and the sloping wall can be pulled all the way up to leave a smaller gap with the top of the inner reservoir than is possible with vertical walls. vertical spacing without causing the risk of breakage during stretching of the inner storage.

The evaporator preferably protrudes over the entire sloped wall.

The angle between the inclined wall surface and the vertical is preferably at least 15° and at most 75°, particularly preferably between 20° and 45°.

The value of the angle of the inclined wall to the vertical should not be so great that there is a danger that condensation droplets formed on the inclined wall can fall freely and come into contact with the stored refrigerated goods; rather, it should be ensured that such droplets It can flow down to the inclined wall surface, so as to finally reach the vertical wall, and discharge it at the lower end of the wall. How large this angle is permissible will depend on the material of the inner wall and its surface properties; in each case the value of this angle can be simply calculated by experiment.

Description of drawings

Other features and advantages of the present invention will be described below through the following embodiments in conjunction with the accompanying drawings. Pictured:

Fig. 1 is a partial cross-sectional view of an inner storage device of a refrigeration device according to the prior art;

Fig. 2 is a partial sectional view of the inner storage device of the refrigeration equipment of the present invention;

Fig. 3 is according to the partial sectional view of a preferred structure of the present invention;

4 to 6 are perspective outside views of storage containers in cooling devices of different configurations according to the present invention; and

Fig. 7 is a front view of an evaporator according to another structure of the present invention.

Detailed ways

Fig. 1 shows a partial sectional view of an inner storage 1' of a conventional refrigeration device. Visible are parts of the top cover 2' and the rear wall 3' of the inner receptacle, and the rounding 4' connecting the two. The radius of curvature of the rounding 4' is chosen such that it is sufficiently safe to avoid fractures between the top cover 2' and the rear wall 3' during the forming of the inner receptacle 1'. A typical radius of curvature required for this purpose is 2 cm. The cold wall evaporator 5' arranged on the rear wall 3 extends to the dotted line position where the vertical rear wall 3' will transition to the rounded 4'. The upper edge of the evaporator terminates at a distance h' of about 2 cm below the top cover 2'.

Fig. 2 shows a sectional view of the same corner of the storage container 1 in the refrigeration device of the present invention. In this device, the structure between the top cover 2 and the rear wall 3 is successively a first rounding 4a, a flat wall surface 6 inclined to the vertical and a second rounding 4b. The radius of curvature of the roundings 4a, 4b in Figure 2 is equal to that at the rounding 4' in Figure 1 . The inclined walls run at an angle α=30° relative to the vertical.

The evaporator 5 mounted on the foam side of the rear wall 3 of the inner container 1 has a main section 7 extending in a conventional manner along the vertical rear wall 3 and an auxiliary section 8 extending horizontally along the bending line , while maintaining an inclination angle α with the lower vertical line, and connected to the main section 7. If the radius of curvature of the inner side of the evaporator 5 turned to the rear wall 3 is not greater than the radius of curvature of the outer side of the rounding 4a, the evaporator 5 can be kept in close contact with the rear wall 3 and with the inclined wall 6 at the same time, thereby The wall surface 6 is effectively cooled. From the comparison of Fig. 1 and Fig. 2, it can be seen that compared with Fig. 1, this structure finally makes the uncooled height h of the inner chamber greatly reduced, while at the same time it is not necessary to reduce the radius of curvature of the rounding 4a, 4b relative to 4'. In this case, h=1/2*h'; generally h=(1-sinα)h'. However, it should be noted that during the deep drawing process of the inner container 1, the radius of curvature of the rounding between the two flat walls can be selected to be smaller, so that the contact angle between the two walls tends to be more obtuse. , while at the same time there is no risk of fracture. In this way, the uncooled height value h can be further reduced, that is, as shown in FIG.

Fig. 4 shows a perspective view of a storage container 1 in a refrigeration device with an evaporator 5 as in the first embodiment mounted on the rear wall 3 of the device. The evaporator 5 essentially consists of a metal plate 10 with good thermal conductivity, and this metal plate is attached to the surface of the rear wall 3 and the inclined wall 6 and on its opposite face, a strip is arranged in a conventional manner. Cooling coil 9. The cooling coil 9 here extends only to the part of the metal plate 10 forming the main section 7 , without passing through the auxiliary section 8 . The auxiliary section is only cooled by heat conduction from the main section 7 . Such a configuration is expedient if the auxiliary section 8 has a small height of only a few cm and/or a relatively large angle α with the vertical.

FIG. 5 shows a construction suitable for auxiliary sections 8 of greater height. In this structure, the cooling coil 9 extends on the auxiliary section 8, and the forward flow and counterflow sections of the cooling coil 9 have a horizontal pipe section 11, which runs along the main section 7 of the evaporator 5 and the auxiliary section 8. The edges between them extend. Such an evaporator can be formed in a simple manner by first placing all cooling coils 9 on a flat metal plate and then bending it to form the main section 7 and the auxiliary section 8 . During the bending process, it is required that the pipe sections 11 are only twisted individually, but no tensile force can be generated which would cause the pipe cross-sectional area of the cooling coil to be reduced at the edge transition region.

In the third configuration shown in FIG. 6 , the evaporator 5 is composed of two separate metal plates forming the main section 7 and the auxiliary section 8 respectively. The distance between the two sections 7 , 8 is very small and they are connected by a small plate 12 which is attached or welded on. These two small plates make it possible to avoid the risk of damaging the cooling coils 9 intersected by the void before the evaporator is mounted on the rear wall 3 . During installation on the rear wall 3 , the auxiliary section 8 can be simply manually bent so that it is positioned exactly on the inclined wall 6 . Since there is a gap between the main section 7 and the auxiliary section 8, sharp bending of the cooling coil 9 during the transition of the two sections can be avoided.

Figure 7 shows a top view of yet another embodiment of an evaporator designed to be mounted on an inner storage container 1 with sloping walls. The metal plate 10 of the evaporator is divided into a main section 7 and a secondary section 8 in each case by a plurality of punched openings 13 , 14 . The opening 13 running along the horizontal bending edge between the main and auxiliary sections ensures that the two sections can be easily bent relative to each other, so that the evaporator can be easily adapted to the positioning of inclined walls during installation. Boreholes 14 are arranged at the edge intersections between cooling coils 9 and main section 7 and auxiliary section 8 , and these openings have a greater extension when crossing the edge than the longitudinally extending openings 13 . During the bending of the evaporator, the pipe sections of the cooling coils 9 which intersect the edges can be inserted into the openings 14 and bent without stress without risk of breaking.

Claims (7)

1. refrigeration plant, have a lagging casing that has an outer wall and one by shell around inner room, and the outer cover of inner room is made of an interior storage (1), should in storage (1) comprise vertical wall (3) and with the top cover (2) of this wall adjacency, this inner room is cooled off by an evaporimeter that does not upward extend at top cover (2) simultaneously, it is characterized in that, in the vertical wall (3) of interior storage and the transitional region between the top cover (2), be provided with at least one flat inclined wall (6), the scope of described transitional region only comprises the sub-fraction of wall (3) and top cover (2), and evaporimeter (5) extends in the inclined wall (6) always.

2. according to the refrigeration plant of claim 1, it is characterized in that, evaporimeter (5) is arranged on the vertical wall (3) that is used as interior storage (1) trailing flank.

3. according to the refrigeration plant of claim 1 or 2, it is characterized in that evaporimeter (5) is arranged on the lateral surface that deviates from inner room of interior storage (1) in the mode that contacts with its maintenance heat conduction.

4. according to the refrigeration plant of claim 1 or 2, it is characterized in that evaporimeter (5) covers the wall (6) of whole inclination.

5. according to the refrigeration plant of claim 1, it is characterized in that inclined wall (6) and vertical line structure at an angle, minimum 15 ° and maximum 75 ° of this angle.

6. according to the refrigeration plant of claim 1, it is characterized in that the angle that inclined wall and vertical line constitute is enough little, little of can guarantee that the condensing drip that is generated can flow on the vertical wall on inclined wall (6).

7. according to the refrigeration plant of claim 5, it is characterized in that this angle is between 20 ° to 45 °.

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