WO2007062916A1

WO2007062916A1 - Refrigerant condenser for a refrigeration device

Info

Publication number: WO2007062916A1
Application number: PCT/EP2006/067581
Authority: WO
Inventors: Thomas Kranz; Jürgen Eberle
Original assignee: BSH Bosch und Siemens Hausgeräte GmbH
Priority date: 2005-11-30
Filing date: 2006-10-19
Publication date: 2007-06-07
Also published as: EP1957893B1; ES2329719T3; DE102005057158A1; RU2008121858A; EP1957893A1; ATE439560T1; DE502006004554D1

Abstract

A refrigerant condenser (3) for a refrigeration device comprises a condenser tube (4) which is bent to form a tube layer (5) which comprises several tens of tube loops (8). The tube loops (8) are fixed in position in relation to one another by struts (9') which are likewise formed by a condenser tube.

Description

Refrigerant condenser for a refrigeration appliance

The present invention relates to a refrigerant condenser for a refrigeration device, which comprises a condenser tube bent into a tube layer comprising a plurality of tube loops, wherein the tube loops are fixed in position relative to one another by struts. In addition, the present invention relates to a method for producing a condenser for a refrigeration device with a multiply bent condenser tube.

Such a condenser is known, for example, from DE 20 2004 017 652 U1. In the wire tube liquefier shown in Fig. 2, the struts are formed by wire rods which are fixed to the condenser tube by welding. The wire rods serve on the one hand to stabilize the multi-curved condenser tube and on the other hand support the heat dissipation from the condenser tube to the environment. However, in order to achieve sufficient support of the condenser tube structure and good heat dissipation, a variety of wire rods are necessary. The welding of the wires on the condenser tube means a large production cost.

From DE 28 43 197 A1 a condenser is known, in which first a tube layer formed with a plurality of series-connected tube loops and rectilinear portions of these tube bearings are then bent once or twice to a compact condenser with rectilinear sections in two or three layers to obtain.

The object of the present invention is to provide a condenser of the type mentioned, in which the struts ensure a good heat transfer from the refrigerant to the environment, a support of the multi-fold condenser tube and the condenser is also inexpensive to manufacture. The object of the present invention is also to specify a cost-effective method for producing a condenser with a multiply bent condenser tube.

The object is achieved with a liquefier according to claim 1 and a production process according to claim 11. The dependent claims relate to preferred embodiments. Accordingly, a condenser for a refrigeration device, for example, a household refrigerator or household freezer is provided which comprises a condenser tube bent to a pipe loop comprising a plurality of pipe loops, wherein the pipe loops are fixed in position by struts, wherein, according to the invention, the struts also by a condenser tube are formed. The usual in the art for stabilizing the pipe layer wire rods can be omitted in favor of one or more even flowed through by refrigerant pipe sections. Thus, the available heat to be available pipe length of the condenser is increased at a constant footprint. In addition, eliminates associated with the manufacture and attaching the large number of wire rods complex manufacturing steps.

Preferably, the pipe layer and the struts are portions of a continuous pipe section.

The struts are preferably formed by pipe grinding a further pipe layer of the condenser tube. In this embodiment, the refrigerant condenser therefore comprises a further, second pipe layer which, like the former pipe layer, is formed from the multiply bent condenser pipe, wherein the pipe loops of one pipe layer serve the other pipe layer as struts.

The pipe layers are preferably connected to one another in the condenser according to the invention by welding, for example by spot welding. This makes it possible to connect the pipe layers in a simple manner by the intersecting, straight sections of the pipe layers are connected to each other at their tube outer walls. For a cost-effective production is possible. Alternatively, it is possible to connect the rectilinear sections at their intersections by latching, binding or plug-in elements with each other or to intertwine the pipe layers together. Thus, a fixing of the pipe layers is possible even without direct material connection, as it arises during welding or soldering. By locking or plug-in elements, it is possible to fasten the pipe layers spaced apart from each other at their intersections. Temperature-induced stresses in the pipe material due to large Temperature differences of the flowing refrigerant can be avoided.

Preferably, in the condenser according to the invention, the pipe layers, viewed in plan view, intersect at at least one point and are fastened to one another at this intersection.

Preferably, each pipe loop comprises two rectilinear, generally parallel sections joined together by a curved section, i. the condenser tube is meandered within a pipe layer. As a result, a simple construction of the condenser with multiple pipe layers is possible. The straight sections of the two pipe layers preferably cross each other at right angles. Each rectilinear section should be attached to at least one point of intersection, preferably at all of its points of intersection, with a rectilinear section of the other layer of tubes thereon.

Preferably, in the condenser according to the invention, the first pipe layer and the second pipe layer hang together a single pipe section. In the production of the condenser, therefore, only this one pipe section must be ge or deformed to bring both pipe layers in their predetermined position to each other. In the case of the condenser disclosed in DE 28 43 197 A1, all rectilinear pipe sections must be bent together to form the layers of the condenser, which makes the production complex and thus expensive.

Preferably, the pipe layers are integrally connected via the pipe section connecting the pipe layers. This makes it possible to form the entire condenser from a single tube by bending it. Thus, only a single type of semi-finished product is needed to produce the condenser.

The pipe layers preferably hang together at one corner of the condenser. For a simple construction and thus a cost-effective production of the condenser is possible. - A -

The condenser according to the invention may also comprise more than two pipe layers, for example three, which are shaped and connected in the same way, as explained above.

The present invention also encompasses a process for producing a condenser described above, for example, which comprises the following steps:

(a) forming a first pipe layer by repeatedly bending a first one

(B) forming a second pipe layer by bending a second condenser pipe part several times; (c) placing the first pipe layer on the second pipe layer such that the pipe layers intersect at at least one location; and (d) attaching the pipe layers to each other at least crossing point. By this simple and inexpensive process, a condenser is obtained in which the wires commonly used for shape stabilization can be omitted.

The tube layers preferably hang together over a tube section which is bent when the tube layers are placed on one another in step (c). As already described above, this has the advantage that in the production of the condenser, only this one pipe section is deformed or deformed in order to bring both pipe layers into their predetermined position relative to one another.

Preferably, the first pipe layer and the second pipe layer and a pipe section connecting both pipe layers are formed integrally from the condenser tube. The condenser may thus be formed by molding a single tube, i. from a single part.

Preferably, the tube layers are formed as a plurality of serially connected tube loops, each tube loop comprising two parallel, rectilinear sections interconnected by a curved section. Thus, a multilayer structure of the condenser is easy to implement.

Preferably, the tube loops of the first tube layer and the tube loops of the second tube layer are formed in one pass and in one plane. In the method according to the invention, the rectilinear sections of the first pipe layer are preferably formed in a length which differs from the length of the rectilinear sections of the second pipe layer. This makes it possible to adapt the condenser in its dimensions optimally to the available rear wall surface of a refrigerator.

The tube section connecting the first tube layer and the second tube layer is preferably initially formed with a radius of curvature which is greater than the radius of curvature of the curved sections of the tube loops. By bending this pipe section in step (c) of the method, its radius of curvature is reduced, so that it has the same radius of curvature in the finished compressor as the curved sections within the pipe layers.

In the context of the present invention, a refrigerator is also provided which has a condenser as described above. This is preferably a refrigerator or freezer, preferably for a private household.

Further features and advantages of the invention will become apparent from the following description of embodiments with reference to the accompanying figures. Show it:

1 is a greatly simplified perspective rear view of a household refrigerating appliance with a back wall condenser according to the invention;

FIG. 2 is a perspective sectional view of a section of the rear wall condenser shown in FIG. 2; FIG.

3 shows a first step in the production of the back wall condenser shown in FIGS. 1 and 2 in a simplified representation;

FIG. 4 shows a second step in the production of the rear wall condenser; FIG.

FIG. 5 shows a third step in the production of the rear wall condenser; FIG. 6 shows a plug-in element for connecting pipes;

Fig. 1 shows a perspective rear view of a household refrigerating appliance. In a rear, rear region of the body 1 is a compressor, not shown, from which vaporous refrigerant is introduced into a located on the rear wall 2 of the body 1 refrigerant condenser 3 according to the invention. As it flows through the condenser 3, the refrigerant via the condenser tube designated by the reference numeral 4 heat to the environment of the refrigerator and liquefies. The effluent from the condenser 3, liquefied refrigerant is passed to a located in the interior of the refrigerator evaporator for cooling the interior.

The condenser 3 is formed from a one-piece condenser tube 4 by multiple bending, which, as can be seen in particular from FIG. 2, extends over a first tube layer 5 and a second tube layer 6 which lie in two planes parallel to the rear wall of the body 1 , Within the pipe layers 5 or 6, the condenser tube 4 forms a plurality of pipe loops 8 and 8 'connected in series. Each pipe loop 8 or 8 'comprises two straight, mutually parallel sections 9 and 9', which are connected by a curved portion 10 and 10 'with each other. The two pipe layers 5 and 6 are connected via a pipe loop 1 1 at a corner 12 of the condenser 3 together. Here the transfer of the refrigerant from the first pipe layer 5 to the second pipe layer 6 takes place.

The straight sections 9 of the pipe layer 5 and the straight sections 9 'of the pipe layer 6 intersect in a plan view of the pipe layers 5 and 6 at a plurality of points 14, here at an angle of approximately 90 °. At the intersections 14, the pipe sections 9, 9 'are connected to each other by spot welding. Thus, the pipe layers 5 and 6 stabilize each other. Conventionally used for stabilizing a pipe layer wire struts or sheets are no longer needed, since the straight sections 9 or 9 'take one of the pipe layers 5 or 6 for the other pipe layer 6 and 5, the function of the wire struts. The rear wall condenser 3 thus has a compact design with a large condenser tube length available for heat exchange. In contrast to the embodiment shown in FIGS. 1 and 2, it is possible to connect the pipe sections 9 and 9 'of the pipe layers 5 and 6 at their crossing points by latching, binding or plug-in elements and thus to fix each other in their position , An example of a plug-in element 20 is shown in FIG. It consists of a slightly elastic plastic and has a cylindrical shape with two intersecting, different deep slots 24, 25, which are provided to be plugged at a crossing point 14 and in each case a pipe section 9, 9 'of the two pipe layers fifth , 6, record. In order to anchor the pipe sections in the slots 24, 25 in a form-fitting manner, the latter each have an expansion 21 or 22 at their bottom.

If the difference in depth of the slots 24, 25 is large enough, the pipe sections frictionally held in the widenings 21, 22 can not directly contact one another. A direct heat exchange between the pipe sections, which can have very different temperatures depending on their location in the heat exchanger, is thus prevented.

The plug element 20 may be attached at all crossing points 14. Alternatively, it is possible to attach a small number of plug-in elements to the rear wall of the body and to attach the condenser by pushing in each case a pipe section 9, 9 'of the two layers 5, 6. In this case, the pipe sections 9, 9 'are preferably welded together at a plurality of crossing points 14, at least those which are not held in one of the plug-in elements 20.

The rear wall condenser 3 described with reference to FIGS. 1 and 2 may also, but not shown, have further pipe layers which are shaped and connected in the same way as explained with reference to FIGS. 1 and 2 , Thus, the back wall condenser can also have three, four or more pipe layers.

FIGS. 3 to 5 show a method for producing the rear wall condenser 3 described in FIGS. 1 to 2. First, as shown in Fig. 3, a one-piece pipe 4 is meandered in a plane, so that it forms a plurality of pipe loops 8 and 8 'connected in series. Each pipe loop 8 or 8 'comprises two straight, mutually parallel sections 9 and 9', which are connected by a curved portion 10 and 10 'with each other. As can be seen from Fig. 3, the condenser tube 4 is bent in tube loops 8 and 8 ', the rectilinear portions 10 and 10' have different lengths. The straight sections 9 of a first condenser tube part 41, which will form the first tube layer 5 of the condenser 3, are formed longer than the straight sections 9 'of a second condenser tube part 42, which will form the second tube layer 6. The tube loops 8 and 8 'are formed in one pass. The distance between the rectilinear portions 9 and between the rectilinear portions 9 'is made equal in both condenser tube parts 41 and 42, respectively. In the transition from the first condenser tube part 41 to the second condenser tube part 42, a curved section 11 is formed whose radius of curvature is greater than that of the curved sections 10, 10 '.

Fig. 4 shows a second step of the manufacturing process. In this step, the first condenser tube part 41 is pivoted over the second condenser tube part 42 to form the tube layers 5, 6. The radius of curvature of the section 1 1 narrows after pivoting the straight sections 9, 9 'of the tube layers 5, 6 at an angle of about 90 °, as shown in Fig. 5, and the radius of curvature of the portion 1 1 is in Essentially the same as in sections 10, 10 '.

Subsequently, at a plurality, preferably all, of the intersections 14 shown in Fig. 5, the straight sections 9, 9 'of the pipe layers 5 and 6 are spot-welded and / or attached to a male element 20 or by bonding, e.g. with the help of a cable tie, attached to each other.

Notwithstanding the manufacturing method shown in FIGS. 3 to 5, it is also possible, in the manufacturing step shown in FIG. 4, to intertwine the two condenser tube parts 5 and 6 and thus to fix them in relation to one another. Welding is then no longer necessary.

Claims

claims

1. refrigerant condenser (3) for a refrigeration device, which comprises a to a plurality of pipe loops (8) comprising pipe layer (5) bent condenser tube (4), wherein the pipe loops (8) by struts (9 ') fixed in position to each other are characterized in that the struts (9 ') also by a

Condenser tube are formed.

Second condenser (3) according to claim 1, characterized in that the pipe layer (5) and the struts (9 ') are portions of a continuous pipe section.

3. Condenser (3) according to claim 1 or 2, characterized in that the struts (9 ') by pipe loops (8') of a further pipe layer (6) of the refrigerant condenser (3) are formed.

4. Condenser according to claim 3, characterized in that the pipe layers (5,

6) are secured together by welding, in particular spot welding.

5. Condenser according to claim 3, characterized in that the pipe layers (5, 6) by plugged plug-in elements (20) are fastened together.

6. Condenser (3) according to claim 3, 4 or 5, characterized in that the pipe layers (5, 6) are intertwined with each other.

7. Condenser (3) according to any one of claims 3 to 5, characterized in that the pipe layers (5, 6) extend in two parallel planes.

8. Condenser (3) according to any one of claims 3 to 7, characterized in that a transition pipe piece (11), via which the pipe layers (5, 6) are connected, is arranged at a corner of the condenser.

9. Condenser (3) according to any one of claims 3 to 8, characterized in that each pipe loop (8, 8 ') comprises two rectilinear portions (9, 9') connected by a curved portion (10, 10 ') with each other are.

10. condenser (3) according to one of claims 3 to 9, characterized in that each pipe loop (8, 8 ') of a pipe layer (5, 6) at least one point

(14) is attached to the other pipe layer (6, 5).

1 1. A process for producing a condenser (3) for a refrigerator, in particular according to one of claims 1 to 9, characterized by the following steps:

(A) forming a first pipe layer (5) by repeatedly bending a first condenser tube part (41);

(b) forming a second pipe layer (6) by repeatedly bending a second condenser pipe part (42); (c) placing the first pipe layer (5) on the second pipe layer (6) such that the pipe layers (5, 6) intersect at at least one point (14); (D) attaching the pipe layers (5, 6) to each other at at least this one crossing point (14).

12. The method according to claim 11, characterized in that a pipe section (1 1) over which both pipe layers (5, 6) are related, when stacking the pipe layers (5, 6) in step (c) is bent.

13. The method according to claim 11 or 12, characterized in that the first pipe layer (5) and the second pipe layer (6) are manufactured in one piece contiguous.

14. The method according to any one of claims 11 to 13, characterized in that the tube layers (5, 6) as a plurality of series-connected tube loops (8, 8 ') are formed, each tube loop (8, 8') two parallel , rectilinear portions (9, 9 ') which are interconnected by a curved portion (10, 10').

15. The method according to any one of claims 1 1 to 14, characterized in that the rectilinear portions (9) of the first tube layer (5) are formed in a length which extends from the length of the rectilinear portions (9 ') of the second tube layer (9). 6) differs.

16. The method according to any one of claims 1 1 to 15, characterized in that the first pipe layer (5) and the second pipe layer (6) are formed in one operation and in one plane.

17. The method according to claim 14 and claim 16, characterized in that in the operation of the first pipe layer (5) and the second pipe layer (6) connecting pipe section (1 1) is formed with a radius of curvature which is greater than the radius of curvature of curved portions (10, 10 ') of the

Pipe grinding (8, 8 ')

18. Refrigerating appliance, in particular refrigerator or freezer, with a condenser (3) according to one of claims 1 to 10.