WO2020169710A1

WO2020169710A1 - Evaporator for a refrigeration device and refrigeration device

Info

Publication number: WO2020169710A1
Application number: PCT/EP2020/054437
Authority: WO
Inventors: Ming Zhang; Bernd Schlögel; Andreas Vogl
Original assignee: BSH Hausgeräte GmbH
Priority date: 2019-02-21
Filing date: 2020-02-20
Publication date: 2020-08-27
Also published as: EP3928040A1; DE102019202361A1; CN113454409A

Abstract

The invention relates to an evaporator (1; 100) for a refrigeration device, in particular a household refrigeration device, the evaporator having an evaporation pipe (10; 110) arranged substantially in a meandering shape, wherein the evaporation pipe (10; 110) is designed as a flat pipe, and wherein a cross-section of the evaporation pipe (10; 110) is twisted in the region of the first bend portions (14; 114) and the second bend portions (16; 16) relative to the cross-section of the evaporation pipe (10; 110) in the region of the straight pipe segments (12; 112) about a central axis (M) of the evaporator pipe (10; 110).

Description

Evaporator for a refrigeration device and refrigeration device

The invention relates to an evaporator for a refrigeration device. The invention also relates to a refrigeration device.

State of the art

Tube-on-sheet and tube-on-foil evaporators for refrigeration devices are generally known. In the context of such evaporator designs, Ver evaporator tubes with a round cross-section are usually used. It is also known to flatten such tubes with a round cross-section during manufacture in order to increase a bearing surface on the evaporator tube and thus to improve heat exchange on the refrigerant side.

However, a maximum achievable degree of flattening of the evaporator tube is limited. Although a higher degree of flattening is desirable for improved heat exchange on the refrigerant side, it is difficult to manufacture. The pipe can collapse, for example, or cracks can arise at the edges of the pipe.

Methods are also known in which flat tubes with a small bending radius are deformed in order to also rest against the respective metal sheet or metal foil in the bending or curved area of the tube. Such processes exist, but they are complex and require a cost-intensive manufacturing facility.

DE 10 2016 210 114 A1 discloses an evaporator with a capillary tube, egg nem evaporator tube and a transition tube between the capillary tube and the evaporator tube, with the free cross-sectional area of the transition tube continuously increasing towards the evaporator tube in a section of the transition tube.

DE 102016224434 A1 discloses a refrigeration device, wherein the first evaporator has meh eral pipe sections elongated in the width direction of the evaporator and each connected via bends, and that the bends each have sections with a small radius of curvature which adjoin the elongated sections, and a large radius of curvature portion between the two small radius of curvature portions.

DE 102008019359 A1 discloses a refrigeration device, wherein the coolant line has a cross-sectional shape which is at least partially flattened and wherein the coolant line is extruded.

Disclosure of the invention

The present invention creates an evaporator for a refrigeration appliance, in particular a household refrigeration appliance, with a substantially meandering evaporator tube, which has a plurality of straight tube segments arranged parallel to one another, a plurality of, at first axial end sections of the straight tube segments cut to the straight pipe segments to closing, adjacently arranged straight pipe segments with each other connecting, first bending sections and a plurality of, at second axial end portions of the straight pipe segments adjoining the straight pipe segments, adjacent to each other, connecting straight pipe segments with each other, having the evaporator tube is designed as a flat tube, and wherein a cross section of the evaporator tube in the area of the first bending sections and the second bending sections compared to the cross section of the evaporator tube in the area of the straight tube segments by a Mi The central axis of the evaporator tube is twisted.

The present invention also provides a refrigeration device, in particular a household refrigeration device, with the evaporator according to the invention.

One idea of the present invention is, by providing the evaporator tube as a flat tube and correspondingly bending the flat tube at the first and second bent sections in such a way that the cross section of the evaporator tube in the area of the first bent sections and the second bent sections compared to the cross section of the evaporator tube in the area the straight Rohrseg elements is rotated about a central axis of the evaporator tube, to provide a simple and inexpensive manufacture of the meandering arrangement of the United evaporator tube. Due to the fact that the cross section of the evaporator tube is twisted in the area of the respective bent sections, i.e. the evaporator tube does not rest on the same base in contrast to the straight tube segments, the bending process for producing the meandering structure of the evaporator tube is far less complex. Furthermore, a prefabricated flat tube, usually rolled up on a roll, can advantageously be used to produce the meandering structure of the evaporator tube, which can be bent in a simple manner in order to provide an evaporator tube with little manufacturing effort in the area of the straight tube segments, which form the predominant area of the evaporator tube, allow an optimal heat exchange on the refrigerant side and the bent sections, which are conventionally production-intensive, can be produced easily and inexpensively.

Advantageous embodiments and developments result from the subclaims Un and from the description with reference to the figures.

According to a preferred development, it is provided that the evaporator tube has a bending angle of essentially 180 ° in the area of the first bending sections and the second bending sections. Thus, straight pipe segments arranged adjacent to one another can be connected to one another in a simple manner by the corresponding bent sections. The evaporator tube is designed in one piece. The segmentation of the evaporator tube into straight tube segments, first bending sections and second bending sections only serves to simplify the description of the respective sections of the evaporator tube.

According to a further preferred development it is provided that the evaporator tube in the area of the first bending sections and the second Biegeab sections is designed mirror-symmetrically with respect to an axis running through an apex of the respective bending section and parallel to the straight pipe segments. A compact, easily producible arrangement of the evaporator tube can thus be provided in an advantageous manner.

According to a further preferred development it is provided that the cross section of the evaporator tube at the apex of the respective bending Section with respect to the cross section of the evaporator tube in the area of the straight tube segments is rotated about the central axis of the evaporator tube by 90 °. This design has the advantage that the bending radius of the evaporator tube is minimal in the area of the respective bent sections and thus the risk of damage to the evaporator tube during manufacture is minimal.

According to a further preferred development, it is provided that the evaporator tube in the area of the first bending sections and the second Biegeab sections is asymmetrical with respect to an axis running through an apex of the respective bending section and parallel to the straight tube segments. The asymmetrical design of the evaporator tube in the area of the bent sections has the advantage that the evaporator tube can be manufactured in any geometry and can thus be adapted to the corresponding spatial and structural requirements.

According to a further preferred development, it is provided that the cross section of the evaporator tube is constant in the area of the straight tube segments, the first bending sections and the second bending sections. A constant flow of a refrigerant through the evaporator tube along an entire length of the evaporator tube can thus be ensured in an advantageous manner.

According to a further preferred development, it is provided that the cross section of the evaporator tube has an aspect ratio of width to height of greater than 1: 1, in particular greater than 2: 1. Such a flat tube has optimal properties with regard to the heat exchange on the refrigerant side.

According to a further preferred development, it is provided that the evaporator tube is designed in the form of a loop in the region of the first bending sections and the second bending sections. A simple, safe and inexpensive producibility of the evaporator tube can thus be ensured in an advantageous manner.

According to a further preferred development it is provided that the United evaporator is formed by a tube-on-sheet evaporator or a tube-on-foil evaporator. Just by providing the flat tube can thus In an advantageous manner, a flat and compact arrangement of the evaporator can be made possible while at the same time bending sections that can be produced easily and inexpensively.

According to a further preferred development, it is provided that the respective end sections of the evaporator tube have a round cross-section. This advantageously enables simple connection to other components of the refrigeration device such as a compressor or a capillary tube, please include.

According to a further preferred development, it is provided that the plurality of straight pipe segments of the evaporator pipe arranged parallel to one another are glued to a metal sheet or a metal foil. Thus, an optimal heat exchange on the refrigerant side can advantageously follow.

According to a further preferred development, it is provided that the evaporator tube is designed as a multiport flat tube, in particular as an extruded multiport flat tube. In this way, the advantageous properties of the multiport flat tube, e.g. an effective heat exchange on the refrigerant side while being inexpensive to manufacture can be combined with the twisting of the tube at the bent sections.

The configurations and developments described can be combined with one another as desired.

Further possible configurations, developments and implementations of the invention also include combinations, not explicitly mentioned, of features of the invention described above or below with regard to the exemplary embodiments.

Brief description of the drawings

The accompanying drawings are intended to provide a further understanding of the embodiments of the invention. They illustrate embodiments and, in conjunction with the description, serve to explain principles and concepts of the invention. Other embodiments and many of the advantages mentioned emerge with a view to the drawings. The elements shown in the drawings are not necessarily shown true to scale with one another.

Show it:

Fig. 1 is a schematic representation of a household refrigerator with a

Evaporator according to the invention;

2 shows a schematic illustration of an evaporator for a refrigeration device according to a first embodiment of the invention;

3 shows an enlarged detailed view of the evaporator for the refrigeration device according to the first embodiment of the invention;

4 shows a schematic representation of the evaporator for the refrigeration device according to a second embodiment of the invention; and

5 shows an enlarged detailed view of the evaporator for the refrigeration device according to the second embodiment of the invention.

Detailed description of the embodiments

In the figures of the drawings, the same reference symbols denote the same or functionally identical elements, parts or components, unless otherwise indicated.

Fig. 1 shows a schematic representation of a household refrigerator with an evaporator according to the invention.

The household refrigerator has two storage areas for different temperatures Lagertem, which are each accessible through a door and are cooled by evaporators 1, 100. An evaporator according to the invention is described in detail below. 2 shows a schematic representation of an evaporator for a refrigeration device according to a first embodiment of the invention.

The evaporator 1 for the refrigeration appliance, in particular the household refrigeration appliance, has an evaporator tube 10 arranged essentially in a meandering manner. The evaporator tube 10 has a plurality of straight tube segments 12 arranged parallel to one another.

Furthermore, the evaporator tube 10 has a plurality of, at first axial end sections 12a of the straight tube segments 12 adjoining the straight tube segments 12, adjacent straight tube segments 12 interconnecting first bending sections 14.

The evaporator tube 10 also has a plurality of, at second axial end sections 12b of the straight tube segments 12 adjoining the straight tube segments 12, adjacent to each other arranged straight tube segments 12 connecting with each other, second bending sections 16.

The evaporator tube 10 is also designed as a flat tube, preferably as a multi-port flat tube, in particular as an extruded multi-port flat tube.

A cross section of the evaporator tube 10 is rotated around a central axis M of the evaporator tube 10 in the area of the first Biegeabschnit te 14 and the second bending sections 16 compared to the cross section of the United evaporator tube 10 in the area of the straight tube segments 12.

This results from the rotation of the orientation of the evaporator tube in the area of the bent sections.

The evaporator tube 10 also has a bending angle of essentially 180 ° in the area of the first bending sections 14 and the second bending sections 16. Furthermore, the evaporator tube 10 in the area of the first bending sections 14 and the second bending sections 16 is mirror-symmetrical with respect to an axis A1 which runs through an apex 18 of the respective bending section 14, 16 and is arranged parallel to the straight tube segments 12. The illustrated evaporator 1 is formed in the following example by a tube-on-sheet evaporator, the evaporator tube 10 in this case is arranged on or in the present illustration under a metal sheet 11.

The plurality of straight pipe segments 12 of the evaporator pipe 10, which are arranged parallel to one another, are glued to a metal sheet 11.

Alternatively, the evaporator 100 can be embodied, for example, by a tube-on-foil evaporator.

Furthermore, the respective end sections 20, 22 of the evaporator tube 10 have a round cross-section. Alternatively, the cross-section in the area of the respective end sections 20, 22 of the evaporator tube can have another suitable cross-section, such as a rectangular cross-section, for example.

3 shows an enlarged detailed view of the evaporator for the refrigeration device according to the first embodiment of the invention.

The cross section of the evaporator tube 10 is rotated at the apex 18 of the respective bending section 14, 16 relative to the cross section of the evaporator tube 10 in the region of the straight tube segments 12 about the central axis M of the evaporator tube 10 by 90 °. Alternatively, for example, another suitable angle of rotation of the cross section of the evaporator tube 10 at the apex 18 of the respective bent sections 14, 16 can be provided. Possible bending areas are, for example, between 45 ° and 135 °.

The cross section of the evaporator tube 10 is preferably constant in the region of the straight Rohrseg elements 12, the first bending sections 14 and the second bending sections 16. Alternatively, the cross section of the evaporator tube can be made variable depending on the systemic or structural requirements of the refrigeration device.

The cross section of the evaporator tube 10 has an aspect ratio of width to height of greater than 1: 1, in particular of greater than 2: 1, in particular preferably of more than 5: 1. The evaporator tube 10 is formed in the area of the first bending sections 14 and the second bending sections 16 also Schleifenför mig. 4 shows a schematic representation of the evaporator for the refrigeration device according to a second embodiment of the invention.

The evaporator 100 for the refrigeration appliance, in particular the household refrigeration appliance, in the present second embodiment likewise has an evaporator tube 110 arranged essentially in a meandering manner. The evaporator tube 110 has a plurality of straight tube segments 112 arranged parallel to one another.

Furthermore, the evaporator tube 110 has a plurality of, at first axial end sections 112a of the straight tube segments 112 adjoining the straight tube segments 112, adjacent straight tube segments 112 connecting one another, first bending sections 114.

In addition, the evaporator tube 110 has a plurality of, at second axial end sections 112b of the straight tube segments 112, the straight tube segments 112 adjoining the straight tube segments 112 and connecting adjacent straight tube segments 112 to one another, second bending sections 116.

The evaporator tube 110 is designed as a flat tube, preferably as a multiport flat tube, in particular as an extruded multiport flat tube.

A cross section of the evaporator tube 110 is rotated around a central axis M of the evaporator tube 110 in the region of the first Biegeab sections 114 and the second bending sections 116 compared to the cross section of the evaporator tube 110 in the region of the straight tube segments 112.

The evaporator tube 110 also has a bending angle of essentially 180 ° in the region of the first bending sections 114 and the second bending sections 116.

The evaporator tube 110 is formed asymmetrically in the area of the first bending sections 114 and the second bending sections 116 with respect to an axis A2 which runs through an apex 118 of the respective bending section 114, 116 and is arranged parallel to the straight tube segments 112. In the following example, the illustrated evaporator 100 is formed by a tube-on-sheet evaporator, the evaporator tube 110 being arranged on or, in the present illustration, under a sheet metal 111.

The plurality of straight pipe segments 112 of the evaporator pipe 110, which are arranged parallel to one another, are here glued to a metal sheet 111.

The respective end sections 120, 122 of the evaporator tube 100 preferably have a round cross section. Alternatively, the respective end sections 120, 122 of the evaporator tube 100 can have another suitable cross section, such as, for example, a rectangular cross section.

The cross section of the evaporator tube 110 is preferably constant in the area of the straight Rohrseg elements 112, the first bending sections 114 and the second bending sections 116. Alternatively, depending on the structural or systemic requirements, the cross section of the evaporator tube 110 can be designed to be variable in the corresponding areas.

The cross section of the evaporator tube 110 preferably has an aspect ratio of width to height of greater than 1: 1, in particular greater than 2: 1, in particular preferably greater than 5: 1.

The evaporator tube 110 is designed in the shape of a loop in the area of the first bending sections 114 and the second bending sections 116.

Although the present invention has been described above on the basis of preferred exemplary embodiments, it is not restricted thereto, but rather can be modified in a variety of ways. In particular, the invention can be changed or modified in manifold ways without deviating from the essence of the invention. For example, a shape, dimension or geometry of the evaporator tube can be changed according to the respective structural or systemic requirements.

Claims

Expectations

1. Evaporator (1; 100) for a refrigeration device, in particular a household refrigeration device, with a substantially meandering evaporator tube (10; 110), which has a plurality of straight tube segments (12; 112) arranged parallel to one another, a plurality of, at first axial end sections (12a; 112a) of the straight tube segments (12; 112) adjoining the straight tube segments (12; 112), straight tube segments (12; 112) arranged adjacent to one another, connecting, first bending sections (14; 114) and a plurality of, at second axial end sections (12b; 112b) of the straight pipe segments (12; 112) adjoining the straight pipe segments (12; 112), adjacently arranged straight pipe segments (12; 112) connecting to one another, second bending portions ( 16; 116), wherein the evaporator tube (10; 110) is designed as a flat tube, and wherein a cross section of the United evaporator tube (10; 110) in the area of the first bending sections (14; 114) u nd the second bending sections (16; 116) is rotated relative to the cross section of the evaporator tube (10; 110) in the region of the straight tube segments (12; 112) about a central axis (M) of the evaporator tube (10; 110).

2. Evaporator according to claim 1, characterized in that the United evaporator tube (10; 110) in the region of the first bending sections (14; 114) and the second bending sections (16; 116) has a bending angle of substantially 180 ° Chen.

3. Evaporator according to claim 1 or 2, characterized in that the evaporator tube (10) in the region of the first bending sections (14) and the second bending sections (16) extending through an apex (18) of the respective bending section (14, 16) and to the straight the pipe segments (12) arranged parallel to the axis (A1) is formed mirror-symmetrically.

4. Evaporator according to claim 3, characterized in that the cross-section of the evaporator tube (10) at the apex (18) of the respective bending section (14, 16) compared to the cross section of the evaporator tube (10) in the area of the straight pipe segments (12) about the central axis (M) of the United evaporator tube (10) is rotated by 90 °.

5. Evaporator according to claim 1 or 2, characterized in that the evaporator tube (110) in the region of the first bending sections (114) and the second bending sections (116) extending through an apex (118) of the respective bending section (114, 116) and to the straight pipe segments (112) arranged parallel to the axis (A2) is formed asymmetrically.

6. Evaporator according to one of the preceding claims, characterized in that the cross section of the evaporator tube (10; 110) in the region of the straight tube segments (12; 112), the first bending sections (14; 114) and the second bending sections (16; 116 ) is constant.

7. Evaporator according to one of the preceding claims, characterized in that the cross section of the evaporator tube (10; 110) has a side ratio of width to height of greater than 1: 1, in particular greater than 2: 1.

8. Evaporator according to one of the preceding claims, characterized in that the evaporator tube (10; 110) in the region of the first bending sections (14; 114) and the second bending sections (16; 116) is designed to be loop-shaped.

9. Evaporator according to one of the preceding claims, characterized in that the evaporator (1; 100) is formed by a tube-on-sheet evaporator or a tube-on-foil evaporator.

10. Evaporator according to one of the preceding claims, characterized in that the respective end sections (20, 22; 120; 122) of the evaporator tube (10; 100) have a round cross-section.

11. Evaporator according to one of the preceding claims, characterized in that the plurality of straight tube segments (12; 112) of the evaporator tube (10; 110) arranged parallel to one another are glued to a metal sheet (11; 111) or a metal foil.

12. Evaporator according to one of the preceding claims, characterized in that the evaporator tube (10; 110) is designed as a multiport flat tube, in particular as an extruded multiport flat tube.

13. Refrigeration device, in particular household refrigeration device, with an evaporator (1;

100) according to one of the preceding claims.