Refrigerating device and evaporator for it

FIELD: heating.

SUBSTANCE: group of inventions relates to a refrigerating device and to the evaporator used in such a refrigerating device. The evaporator for a refrigerating device comprises a pipe through which the refrigerant passes. The said evaporator comprises at least one bearing plate on which the pipe is fixed. Between the pipe and the bearing plate a heat-distributing layer is located. The heat-distributing layer is graphitiferous. Also a refrigerating device is disclosed.

EFFECT: group of inventions is aimed at providing good heat exchange between the pipe and the bearing plate, increasing efficiency.

15 cl, 6 dwg

 

The technical field

This invention relates to refrigerating apparatus, in particular a domestic refrigeration device, and the evaporator used in this refrigeration apparatus.

The level of technology

This evaporator comprises generally a pipe in which the refrigerant circulates, a support plate, on which are fixed the pipe and through which the heat exchange between the pipe and one of the cooled evaporator cavity devices for cooling, and a heat-distributing layer, located between the pipe and the ground, which promotes efficient heat transfer between the base and the handset.

From patent document DE 202005000909 U1 known evaporator of this type, in which the carrier plate is a formed in the inner chamber of the refrigerating apparatus tub freezers, around which is wrapped the pipe. Possible location between the pipe and the tub freezer metal plates as the heat distribution layer. If the contact surface of a metal plate with a bath freezer is great, it creates a good thermal coupling pipe freezer. However, it is heavy and the road.

Several less costly solution - stick aluminum foil with a thickness of 30 μm on the outer surface of the bath freezer is, to wrap around her pipe and glue. If the adhesive layer that secures the tube in aluminum foil, thin enough, then reached thermal conductivity of the evaporator, it is sufficient for the demands of practice. However, this thin layer of glue not always reliably implement. Fluctuations in the plasticity of the pipe can cause the individual coils of pipe is not pressed to the aluminum foil quite closely, so between them and the pipe remains an air gap or formed a thick layer of adhesive substantially impede heat transfer. Aluminum foil is cheaper than the metal plate, but nevertheless there is a need for a more cost effective solution that reliably provide good heat transfer between the pipe and the support plate.

Disclosure of inventions

The objective of this invention is to provide such an evaporator for refrigerating apparatus, which, while keeping costs at least equivalent to conventional evaporator for its thermal qualities.

The problem is solved due to the fact that in the evaporator for refrigerating apparatus with a tube through which refrigerant passes, at least one support plate, on which the reinforced pipe, and a heat-distributing layer located between the pipe and the support plate, replaceparameters the second layer contains graphite. thermal conductivity of graphite is higher than thermal conductivity of many metals, and is only slightly lower than that of aluminum, at a much lower cost. Therefore, the thickness of the layer or film of graphite, which is only slightly larger than the thickness of aluminum foil, enough to get the evaporator heat transfer rate which is at least as great as in the case of conventional evaporator of the type indicated above, which have the same size.

The proportion of graphite in the heat distribution layer should preferably contain at least 100 mg/cm2better still at least 200 mg/cm2with a thick layer of pure graphite, respectively, in 50 or 100 micrometers. A layer of graphite such thickness can easily reach the heat transfer coefficient of 0.4 W/m2·K.

In accordance with the first embodiment of the invention a heat-distributing layer comprises a film of essentially pure graphite. Essentially pure from the point of view of the present invention, a layer of graphite can be considered, if possible impurities do not affect the conductivity of the layer.

Because pure graphite is very soft, a film made of pure graphite is difficult to use. In accordance with the second embodiment heat-distributing layer may contain a film of synthetic material, with graphite filler. Hot is similar synthetic film should generally be thicker than pure graphite film to achieve the same thermal conductivity, but its advantage lies in the greater ease of its use. The film can be macroscopically homogeneous structure with the graphite particles included in a synthetic matrix, or multi-layered structure with a layer of graphite sandwiched between synthetic layers.

In accordance with the third embodiment as a heat distribution layer is treated graphite-bearing plate of synthetic material.

It is also possible to combine into one evaporator of the three aforementioned variants, as described in more detail below.

The advantage of pure graphite in its elasticity, which ensures that when the pipe to push the layer of graphite deepening and thus establish a close thermal contact between the pipe and the heat-distributing layer on a much larger surface than would be possible in the normal case, between the pipe and the metal plate or metal foil pasted on a larger plate. Such deepening is easy to form in the film of plastic with graphite filler, as this film is, in General, be more elastic, the higher the proportion of graphite in it. In the case of containing synthetic graphite plate has the ability to advance the e to form such a recess in the plate, in order to invest in a pipe.

Due to their relatively high in comparison with the films of the stiffening plate of plastic can also be attached to the pipe protrusions that provide a tight thermal contact between the plate of plastic pipe.

These protrusions preferably are in pairs facing each other concave side surfaces, which are inserted in the pipe.

To create a large contact surface for efficient heat transfer, the tabs should be implemented in the form of ribs running along a pipe.

You can perform carrier plate forming a wall of the refrigerating chamber or the freezing chamber of the refrigerating apparatus according to the invention.

If at least two walls of the freezer are bearing plate heat exchanger, the layer of replacespaces on the first of these walls may include synthetic graphite-containing plate, and the second wall film.

Due to the higher compared to film the load capacity of a synthetic plate you can pipe location on the first wall with a tighter fit than the second.

The first wall is preferably the rear wall or bottom freezer. If the rear wall is advisable to use synthetic plate, that is how there is less practical to fix the pipe, winding it around the freezer. In the bottom, it is possible, it is desirable to lay the pipe more tightly, to allow more high cooling capacity for fast freezing laid on the storage of refrigerated products.

The invention is, of course, also applicable to the evaporator, the carrier plate which is freely located in the inner space of the refrigerating apparatus.

A brief commentary on drawings

Further characteristics and advantages of the invention follow from the following description of embodiments referring to the attached figures. They show the following:

figure 5
figure 1a schematic cross-section household refrigeration apparatus according to the first embodiment of the invention;
figure 2a schematic cross-section of the refrigeration apparatus in accordance with the second embodiment of the invention;
figure 3partial incision freezer refrigeration apparatus with figure 1 or figure 2, is shown not to scale;
figure 4incision of the walls of the freezer;
the cut wall of the freezing chamber in accordance with another

embodiment; and

figure 6schematic axonometric image of the inner container freezer

with the evaporator according to the invention.

The implementation of the invention

Figure 1 shows a section of a combined household refrigeration apparatus with a housing 1, a conventional refrigerating chamber 2 freezer 3 and 4 door, 5 for closing the chambers 2, 3. Camera 2, 3 in a known manner distinct from that of the surrounding layer of insulation material through the inner chamber, is created by means of deep drawing. Each of the internal chambers has the shape of a box with the front part open, respectively, toward the doors 4 and 5, the rear wall 7, the top, bottom and side walls 8, 9 and 10, respectively. The outer side walls 8, 9, 10 inner chamber freezers, converted to a layer 6 of insulating material, covered with a film of graphite or plastic with graphite filler, which is not visible in figure 1 because of its small thickness. Possible sticking of the film respectively separately on each wall 8, 9, 10, or wrap it around all four walls 8, 9, 10. Aluminum is the tube 11 to spiral refrigerant passes through the walls 8, 9, 10 inner chamber in close contact with the film.

Figure 2 shows an alternative implementation of the refrigerating apparatus according to the invention. In this embodiment, the inner chamber 6, is wrapped by a layer of insulating material, bordered internal volume 12, which is mounted through in her box 13 is divided into the freezer (in the cavity of the box 13) and conventional refrigerating chamber 2 (outside of the box 13). Wall of the box 13, made of plastic or metal, the outside covered with a film of graphite or plastic with graphite filler, and around the film spirally coiled pipe with refrigerant 11.

Figure 3 schematically and not to scale shows a partial section of the inner container freezer refrigeration apparatus 1 or the box 13 with figure 2. Shows the top wall 8 and the adjacent portion of the side wall 10. Shown here in 14 film of graphite or plastic with graphite filler, forming a unit, passes through the walls 8, 10. Thanks to the efforts resulting from the winding tube 11 around the camera, the pipe 11, especially near the rounded edges 15, embedded in an elastic film 14. The initial thickness of the film 14 in these places is shown by the dashed line. This elasticity of the film leads to more extensive contact between the film 14 and the pipe 11 near ribs 15, which, is turn, provides a highly efficient heat transfer between the pipe 11 and the film 14.

Figure 4 shows a section of the upper wall 8, which clearly shows how the pipe 11 is pressed to the film 14.

In addition, as shown in figure 3, the portion of the pipe 11 passing between the two angles can be slightly arched and yet throughout its length to touch the film 14. Thus, the efficiency of the heat exchanger formed by the pipe 11, the film 14 and the walls 8, 9, 10 inner chamber, equal to the efficiency of conventional evaporator, using as a heat-distributing layer between the refrigerant pipe and the wall of the internal chamber aluminum film, even if the coefficient of heat transfer film 14 is higher than that of conventional aluminum film.

In practice, however, it is easy to provide film 14 at least equivalent heat transfer coefficient. If the film 14 is made of pure graphite, it is sufficient thickness of 100 to 200 micrometers to provide a heat transfer coefficient of about 0.5 W·m-2K-1that corresponds to the characteristic of ordinary aluminum film thickness of 30 micrometers. This thickness corresponds to the number of graphite from 100 to 200 mg/cm2and it should be assumed that the proper amount of graphite to be enough in the film with graphite fill elem, in order to achieve the same heat transfer coefficient.

Instead of the flexible film 14 can also be used as a heat distribution layer between the pipe 11 and the walls 7, 8, 9 and/or 10 plastic plate 16, the conductivity is increased by the addition of graphite. However, the number of graphite, which can be added to most synthetic materials, not denying them the strength is limited, so thermal conductivity of the plastic plate 16 as a whole is significantly lower than that of the plate of pure graphite. However, this disadvantage is not of great importance, as appropriate kinds of cheap plastic, so that sufficient for practical purposes, the heat transfer coefficient is 0.4 W/m2·K, can be achieved by choosing the adequate thickness of the plastic plate 16. In practice, the thickness of the plate 16 from 1 to 2 mm is sufficient to accommodate the desired number of graphite from 100 to 200 mg/cm2.

A significant advantage of a plastic plate 16 is, however, that it is possible to form it as shown in figure 5, the tabs 17 which clamp the pipe, and thus to provide efficient heat transfer between the pipe 11 and the plate 16. You can perform similar protrusions, for example, in the form of hooks that secure the pipe to the plate; preferred is shown in Phi is .5. a variant in which the protrusions 17 are made in the form of elongated in the longitudinal direction of the ribs, in pairs bounding the groove, in which is enclosed pipe 11. To further improve the heat transfer, the projections 17 in the form of ribs on figure 5 are facing each other, the concave side surface 18, the radius of curvature of which respectively coincide with the outer radius of the corresponding pipe 11, so that the side surface 18 and the pipe 11 in contact for more than half of the circumference of the pipe.

Figure 6 shows the axonometric image of the internal chamber of the freezer in accordance with a variant of the improvements of the present invention in a direction at an angle from below. The top, bottom and side walls 8, 9, 10 of the inner chamber, as described in connection with figures 1-3, covered with graphite-bearing film 14, as denoted by the dashed figure 6 section 19 of the tube 11 of the refrigerant'd proceed around spiral around the walls 8, 9, 10 in contact with the film 14. As on the rear wall 7 of the inner camera tube 11 cannot be fixed by wrapping, as in the case of section 19, here glued to the plate 16 of the type described in connection with figure 5, and section 20 of the pipe 11 passing in the form of a meander on the plate 16, is clamped between the respective protrusions emanating from the plate 16. Thus, the freezer is cooled at the same time, what about with five sides; heat can penetrate only through the open front side.

To compensate for the flow of heat from the open front side and to retain the maximum possible uniformity of the temperature distribution in the freezer, it is desirable to increase the density with which laid the pipe 11 in the front, at least in the front part of the bottom wall 9. This increased density on a single wall, however, is unattainable in section 19 with the pipe, spirally twisted around the walls 8, 9, 10. In order to provide the opportunity to increase the density in the anterior region of the lower wall 9, there is placed a second plate 21 of graphitemoderated plastic: it can be glued to the film 14 or the film 14 on the area occupied by the plate 21, is cut. Part 22 section 19 of the pipe around the walls 8, 9, 10, passes through the plastic plate 21 in its longitudinal direction. On both sides of this part 22 of the tube is a pair of protrusions, between which are secured the fate of the pipes 23, 24 parallel to the pipe section 21. These sections of the pipes 23, 24 are connected between themselves and with the end 19 of the pipe with the help of lap 25, 26. Section 27 of the pipe, passing along the edges 15 between the bottom and side wall 9, 10, represents a connection to a tube passing through the rear wall 7.

1. The evaporator for the refrigeration devices is and with a pipe (11), which refrigerant passes, with at least one support plate(7, 8, 9, 10), fixed on the pipe (11)and located between the pipe (11) and bearing plate (7, 8, 9, 10) heat-distributing layer (14, 16, 21), differentthe fact that a heat-distributing layer (14, 16, 21) is graphitemoderated.

2. The evaporator according to claim 1, characterized in that the proportion of graphite in the heat distribution layer (14, 16, 21) is at least 100 mg/cm2preferably at least 200 mg/cm2.

3. The evaporator according to claim 1, characterized in that the heat-distributing layer (14, 16, 21) has a heat transfer coefficient of at least 0.4 W/m2·K.

4. The evaporator according to claim 1, characterized in that the tube (11) is held in the recess in the heat distribution layer (14).

5. The evaporator according to one of claims 1 to 4, characterized in that the heat-distributing layer comprises a film (14) of essentially pure graphite.

6. The evaporator according to one of claims 1 to 4, characterized in that the heat-distributing layer includes a plastic film (14) with graphite filler.

7. The evaporator according to one of claims 1 to 4, characterized in that the heat-distributing layer comprises a plastic plate (16, 21).

8. The evaporator according to claim 7, characterized in that the plastic plate (16, 21) has projections (17)securing the pipe (11).

9. The evaporator p is item 8, characterized in that the projections (17) are concave side surfaces (18), arranged in pairs opposite each other.

10. The evaporator of claim 8 or 9, characterized in that the projections (17) made in the form of ribs along the pipe (11).

11. Refrigerating apparatus, in particular a domestic refrigeration device, evaporator, as claimed in any of the preceding paragraphs, characterized in that the carrier plate (7, 8, 9, 10) forms a wall of the refrigerating or freezing chamber of the refrigerating apparatus.

12. The refrigeration apparatus according to claim 11, characterized in that at least two walls (7, 8, 9, 10) freezers are bearing plates of the heat exchanger and that the heat distribution layer (14, 16, 21) includes a plastic plate (16, 21)filled with graphite, on the first of the walls (7, 9) and the film (14) on the second wall (9).

13. The refrigeration apparatus according to item 12, characterized in that the tube (11) on the first wall (9) arranged more densely than the second wall (10).

14. The refrigeration apparatus according to item 12 or 13, characterized in that the first wall is a rear wall (7) or the bottom wall (9) of the freezing chamber.

15. The refrigeration unit evaporator claimed in any one of claims 1 to 10, characterized in that the carrier plate is freely located in the inner space of the refrigerating apparatus.



 

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