ES2205365T3 - REFRIGERATOR. - Google Patents

Abstract

IN AN EVAPORATOR (10,20,30,40,50) FOR DISPOSITION OUTSIDE THE REFRIGERATION SPACE TO WHICH IT SHOULD COOL AND FORCED VENTILATION THROUGH COLD AIR FORCED REFRIGERATION IN THE FAN THAT TRANSPORTS IT TO THE REFRIGERATION SPACE THE EVAPORATOR IS CONFIGURED (10 , 20.30,40,50) THROUGH LESS THAN TWO PLANS (11,21,31,41,51) WITH THERMAL DRIVING CAPACITY, APPROXIMATELY PARALLELLY PROVIDED ONE OVER ANOTHER, THROUGH WHICH IT EXTENDS AT LEAST A HALF COOLING CHANNEL (13,23,33,43,53) THAT JOINS ONE WITH ANOTHER BOTH PLANTS (11,21,31,41,51) ACCORDING TO COOLING TECHNIQUE, FINDING IN THERMAL CONDUCTOR CONTACT WITH THE DRAWINGS (11 , 21,31,41,51).

Description

Refrigerator.

Evaporator

The invention relates to a refrigerating apparatus according to the preamble of claim 1. An apparatus of this class, it is known, for example, by the patent US-A-3,081,608.

In built refrigerators and freezers as refrigerators No-Frost the evaporators that serve to generate the cold are located outside of the storage compartment and are made so general as sheet evaporators. In this class of evaporators evaporator tubes are provided in the form of meanders, which to increase its heat transmission surface They are provided with sheets in the form of thin plates, arranged to along its meander shape. The making of this kind of evaporators is complex, in terms of manufacturing technique, and at a high cost, especially if the evaporator tubes are assembled and welded together from pieces of tube straight and curved individual.

The invention aims to improve a refrigerating apparatus according to the preamble of claim 1, applying simple design measures.

This objective is resolved in accordance with the invention by the features of claim 1.

Through the plans made as plates you can economically achieve surfaces of large heat exchange, without having to apply measures complex in terms of manufacturing technique, for example, in shape of sheets and by arranging them in parallel superimposed at the same time achieves a cooling performance desired with reduced space needs. The planes made as plates also offer the possibility of increase the density of the arrangement of the ducts refrigerating agent, with technical manufacturing measures simple, to increase the cooling performance of the evaporator.

According to the invention it is provided that the planes are formed by folding a single stage piece, in whose folded state the planes are faced between yes at least substantially parallel and are provided with the system of ducts of refrigerating agent.

An evaporator of this kind can not only be manufacture in a particularly simple and economical way, in terms of manufacturing technique, but because of its U-shaped section It offers a high rigidity of its own, which facilitates notably the manipulation of the evaporator during the manufacturing.

The evaporator duct arrangement is you can modify in a particularly simple way, in terms of manufacturing technique and therefore can be adapted so especially appropriate to its necessary cooling performance if  according to a following preferred embodiment of the object of the invention it is provided that the stage, with the system of ducts of refrigerating agent arranged on it, is manufactured by the Roll-Bond procedure or Z-Bond

A provision is especially obtained economical for an evaporator if according to a following way preferred embodiment of the object of the invention is provided that the refrigerant agent duct system is made as a pipe formed in meanders, fixed on the planes with heat conductive contact

This embodiment of an evaporator also allows a specific combination of materials between the pipe crossed by the refrigerating agent and the plans they represent heat exchange surfaces, with which you can easily optimize heat transfer between the two elements.

The refrigerating agent duct system it is arranged especially effectively in the evaporator if according to a following advantageous embodiment of the object of the invention is provided that the agent duct system refrigerator is provided on the faces of the facing planes each. This also has the possibility of inserting between the plans some additional elements to continue increasing heat exchange surfaces, to get a contact extremely intensive heat conductor, without it being necessary to increase the space needed to house the evaporator.

It can be manufactured especially easily an additional element, which serves to increase the surfaces of heat exchange, if according to a following embodiment advantageous of the object of the invention is that between planes arranged parallel and superimposed a profile is arranged corrugated that is in heat conductive contact with those.

According to another embodiment preferred object of the invention is provided that among the planes arranged parallel and overlapping are arranged several pieces of wavy profile, next to each other, in conductive contact of heat with the planes, passing the waves of two pieces of wavy profile arranged adjacent to each other in phase opposition among them.

By means of this variant embodiment, in the evaporator a heat exchange surface especially large and it takes up little space, being able to get ready the wavy profiles that contribute to increase the surface of heat exchange in a heat conductive contact especially intensive with the planes, due to its disposition between the two blueprints.

The planes that form the evaporator will be performed in a particularly convenient way if according to a Next advantageous embodiment of the object of the invention is provided that the two planes are made at least to a large extent  forming a continuous surface.

According to a following embodiment preferred of the object of the invention it is provided that the two planes have arranged surface elements protruding from its surface.

In this way it is achieved on the surfaces of heat exchange an increase of the surface that, by a part, can be obtained especially conveniently in as for the manufacturing technique during the manufacture of the evaporator and that by its direct union to the surfaces of heat exchange is in a heat conductive contact especially intensive with heat exchange surfaces without resorting to additional measures. Finally, through a solution of this class avoids additional elements for increase the heat exchange surface in the evaporator, that can be put in contact with intensive heat conductor thanks  to additional measures.

An especially intensive air agitation flowing around the heat exchange surfaces and therefore, a good heat transmission from the surfaces of heat exchange to this air, is obtained if according to a last preferred embodiment of the object of the invention is provided that the surface elements are arranged protruding alternately from the planes, and both in the intermediate space between the two planes as well as away from this one, are oriented towards the outside.

The invention is detailed in the description. following using several examples of realization Simplified represented in the attached drawing.

In this one you can see:

Fig. 1 a first embodiment of a evaporator through several parallel planes produced by folding a platen, in a frontal view; this form of embodiment is not part of the invention;

Fig. 2 the evaporator according to figure 1 seen in plant;

Fig. 3 a second embodiment of a evaporator with two planes as a stage arranged one on other, and coupled to each other, as regards the refrigeration technique, by means of a tubular duct of refrigerating agent, in a view frontal;

Fig. 4 the evaporator according to figure 3, seen in plant;

Fig. 5 the evaporator according to figure 4, with a wavy profile arranged between your planes, in a view frontal;

Fig. 6 the evaporator according to figure 5, seen in plant;

Fig. 7 the evaporator according to figure 5, with another wavy profile arranged between your planes and in phase opposition with the first wavy profile, in a frontal view;

Fig. 8 the evaporator according to figure 5, seen in plant;

Fig. 9 a last embodiment of a evaporator performed similarly to the evaporator represented in figure 3, with surface elements arranged standing out in its evaporator planes as a stage, in a side view;

Fig. 10 the evaporator according to figure 9, seen in plant.

In figure 1 an evaporator 10 is shown suitable for use in refrigerators of the type called No-Frost, such as refrigerators or freezers, which presents three planes 11 arranged parallel each other and overlays, made of a conductive material of heat, for example, as aluminum or aluminum alloys. These planes are produced by multiple folding a cutout of aluminum sheet as a stage, where folding creates a piece of wall 12 arranged essentially perpendicular to the planes 11, which joins together respectively two planes 11 contiguous with each other forming a single piece. The planes 11 are equipped on their inner faces facing each other with a duct system of refrigerating agent placed in the form of meander, which is applied in the platen-like cutout of the evaporator 2 by the Roll-Bond procedure, being provided the system of ducts of refrigerating agent 13 in the upper and intermediate plane 11 as well as in the wall piece 12 which joins the two planes 11 together, on an outer face of the stage, while in the intermediate and lower plane 11 as well as in the piece of wall 12 that serves to join these together, the system of ducts of refrigerating agent 12 is arranged in the face exterior of the stage opposite it. Duct systems of refrigerating agent 13 provided in intermediate plane 11, for both sides of this piece of platen are joined together by a piece of duct that is not shown in greater detail, of so that the three planes 11 are covered with a conduction of continuous refrigerating agent, which is fed with agent refrigerator by a cold machine of a refrigerator No-Frost Due to the separation between the planes 11 that are arranged next to each other create spaces Intermediates 14 used for forced ventilation of the planes 11 and therefore to increase heat transmission in the planes 11 by the circulating cooling air so forced, for example, by a fan, the evaporator ventilation direction 10 in transverse direction to the refrigerating agent duct system 13 arranged in meander, as indicated by way of example in figure 2 by means of an arrow.

Figure 3 shows in a representation simplified schematic another embodiment of an evaporator 20, which presents two planes as a stage made, by example, in aluminum or in an aluminum alloy, arranged separated and parallel to each other. The planes 21 are endowed with their inner faces 22, facing each other, of a system of refrigerating agent ducts 23 arranged in the form of a meander, formed, for example, by a conduit made of copper tube which is in heat conductive contact with the planes 21. The duct systems 23 refrigerating agent on faces interiors 22 are joined together by means of a connecting piece 24, so that the evaporator 20 has a conduit of continuous refrigerating agent that runs through its two planes 21. Due to the separation between them, the planes 21 form a intermediate space 25, which is used for forced ventilation of the inner faces 22, in particular of the duct system of cooling agent 23, the ventilation being used for increase the heat transmission that passes into the recirculated air forced, in transverse direction to the duct systems of refrigerating agent 23 arranged in a meander, along the planes 21, as indicated by way of example in the figure 4 using an arrow.

Figure 5 and Figure 6 show an evaporator 30 which is similar to evaporator 20 and same as that presents two planes 31 made as a stage, arranged separately and parallel to each other, of a material heat conductor, such as aluminum or similar, which like the planes 21 are equipped by their inner faces 32 faced with each other agent duct systems refrigerator 33 that runs in the form of a meander, and that are joined together by means of a connecting piece 34 to form a continuous cooling agent duct that runs through the entire evaporator. The planes 31 form, due to the vertical separation between them, an intermediate space 35 between its inner faces 32, which, like the intermediate space 25, has forced ventilation by forced recirculated cooling air by means of a fan (represented symbolically in figure 6 by a arrow) to get more favorable heat transmission, and that serves to house a wavy profile 36 that increases the heat transfer surface of planes 31. This profile is located within the intermediate space 35 in conductive contact of heat with the refrigerant agent duct system 33 in the inner faces 32 and additionally serves to increase the turbulence for the cooling air that is forced through of the intermediate space 35. The corrugated profile 36 is manufactured, for example, by shaping without chip removal of a sheet metal plate of a good heat conductor material such as aluminum, copper or similar, and has in its wavy form, at least to a large extent, the same dimensions as the planes 31.

Figures 7 and 8 show a variant of realization of an evaporator 40 of similar construction to that of the evaporator 30, with two planes 41 arranged parallel apart each. These are endowed with their inner faces 42, facing each other, with two agent duct systems refrigerator 43 arranged in a meander shape, which are attached each other by means of a tubular connection piece, and that are formed by a pipe of a good heat conductor material such as copper, aluminum or the like, arranged in shape meander in heat conductive contact with planes 41. Enter the planes 41 and due to their parallel separation from each other a  intermediate space 45 within which, along the planes 41, cooling air is driven to achieve a transmission of more favorable heat forced in the direction of the arrow (see the figure 8). Within the intermediate space 45 are provided sections of wavy profile 46 and 47, where both sections of profile corrugated 46 and 47 are in heat conductive contact with the refrigerant agent duct system 43 of plane 41 located at a higher height and in heat conductive contact in the system cooling agent ducts of the lower plane. For increase turbulence of the driven cooling air of forced way through intermediate space 45, the sections of corrugated profile 46 and 47 are disposed offset from each other, such way that the wave valleys and wave crest of the stretches of wavy profile, arranged in the form of a band in the direction of the driven cooling air arrow, run on contraphase each other (see figure 7 in this regard).

In Figures 9 and 10 another one is represented embodiment of an evaporator 50, formed by two planes 51 arranged one above the other and spaced parallel to each other, of a Good heat conductor material such as aluminum or an aluminum alloy The planes 51 are provided by their interior faces 52 facing each other with two systems of cooling agent ducts 53 in the form of a pipe made of meander, of a good heat conductive material such such as copper, the duct systems being refrigerating agent 53 joined together by means of a piece of tubular joint 54 to form a refrigerating agent line continuous for evaporator 50. This one is equipped in its two planes 51 with flaps 55 made as tabs and arranged protruding from the surface of the planes 51, which they are provided between the sections of tube arranged in the meander of the refrigerant agent duct system, similar to a matrix whose columns run noticeably perpendicular to the pipe sections of the agent duct systems refrigerator 53. Of the columns of the matrix, the immediately contiguous are arranged beveled in height from each other, where the flaps 55 located in the columns set back in the offset in height penetrate with its free ends in an intermediate space 56 formed by the separation between planes 51, while flaps 55 provided in the remaining columns of the matrix are directed with their free ends outside the intermediate space 56. To get a more favorable heat transmission is driven forced cooling air in intermediate space 56 by means of a fan, which due to the flaps 55 protruding in different directions, acquires an additional turbulence, of so that the turbulence of the cooling air is increased forced forced into the intermediate space and in this way is improved additionally heat transmission.

The melting water that is produced during the defrosting period due to frost formation in evaporators must be evacuated by means of a drainage system that it must be incorporated into the plans, which reduces notably to a minimum the defrosting water is returned to freeze on evaporator planes. An evaporator that is equipped with a drainage system in its planes can be used also in a horizontal installation position without prejudice to Defrost function. In case you go to give up a drainage system in the planes, it is convenient use the evaporators with their planes in a position of vertical installation, to always ensure that the water from fusion that occurs during the defrosting phase can drain quickly from the planes and therefore there is no risk that it will freeze again in the planes of the evaporators

Claims (9)

1. No-Frost refrigerator with a refrigerator compartment and with an evaporator located outside the refrigerator compartment that is to be refrigerated, for forced ventilation by means of a fan that forced the cold refrigerated air into the cold room. evaporator at least by two heat conducting planes arranged one on the other substantially parallel (21, 31, 41, 51), through which at least one refrigerating agent duct (23, 33, 43, 53) extends that joins the two planes together, in the technical aspect of cold, and that is in conductive heat contact with the planes, characterized in that the planes (21, 31, 41, 51) are formed by folding a plate, which in The folded state has a section that is at least substantially U-shaped and which are provided on at least one of its large plate surfaces of a refrigerating agent duct (23, 33, 43, 53). 2. No-Frost refrigerating apparatus according to claim 1, characterized in that the refrigerating agent duct (23, 33, 43, 53) is formed on the stage by the Roll-Bond process. 3. No-Frost refrigerating apparatus according to claim 1 or 2, characterized in that the refrigerating agent duct (23, 33, 43, 53) is made as a pipe formed in meanders, which is fixed in the planes (21, 31, 41 , 51) in heat conductive contact. 4. No-Frost refrigerating apparatus according to one of claims 1 to 3, characterized in that the refrigerating agent duct (23, 33, 43, 53) is provided on the outer faces of the planes (21, 31, 41, 51) facing each other. 5. No-Frost refrigerating apparatus according to one of claims 1 to 4, characterized in that between the planes (31, 41) arranged parallel and superimposed there is a corrugated profile (36, 46, 47) which is in heat conductive contact with they. 6. No-Frost refrigerating apparatus according to claim 5, characterized in that next to the corrugated profile (46) disposed between the two planes (41) is located another corrugated profile (47), in contraphase. 7. No-Frost refrigerating apparatus according to one of claims 1 to 6, characterized in that the two planes (21, 31, 41) are made at least for the most part forming a continuous surface. 8. No-Frost refrigerating apparatus according to one of claims 1 to 6, characterized in that the two planes (51) have surface elements (55) located above their surface. 9. No-Frost refrigerating apparatus according to claim 8, characterized in that the surface elements (55) are arranged projecting alternately outside the planes (51) and are oriented both towards the inside of the intermediate space (56) between the two planes ( 51) as well as away from it, outward.