CN111748993A

CN111748993A - Heating equipment of clothes dryer

Info

Publication number: CN111748993A
Application number: CN201910720227.6A
Authority: CN
Inventors: 托比亚斯·宝德; 乔治·苏亚雷斯; 克里斯坦·梅尔; 斯蒂芬·坎珀斯
Original assignee: Poly Tech Plastics Germany Lianghe Co
Current assignee: Poly Tech Plastics Germany Lianghe Co; Polytec Plastics Germany GmbH and Co KG
Priority date: 2019-03-29
Filing date: 2019-08-06
Publication date: 2020-10-09
Also published as: DE102019204424A1

Abstract

The present invention relates to a clothes dryer heating apparatus, comprising: a flow-through channel (12) defined by the housing (10). For heating the air flow, a heating element (16) is arranged in the flow-through channel (12). In order to shield the housing (10), in particular made of plastic material, from heat, a shielding element (18) is provided between the heating element (16) and an inner side (20) of the flow-through channel (12).

Description

Heating equipment of clothes dryer

[ technical field ] A method for producing a semiconductor device

The present invention relates to a heating apparatus of a clothes dryer.

[ background of the invention ]

In order to dry laundry in a laundry dryer, air is heated via a heating element and supplied via an air supply channel into a drum in which the laundry to be dried is arranged. The heat dissipated from the drum via the suction channel is usually dehumidified by a condenser and then fed back to the heating element, thus creating an air circuit. Conventional heating elements generate temperatures that are very high, possibly in excess of 300 ℃. Therefore, it is necessary to arrange the heating element in a metal housing, typically an aluminium die-cast housing. In order to thermally shield the housing, it is also necessary to provide foam or other closure elements on the surface and/or to arrange adjacent temperature-sensitive components, such as electronic components, cables, plastic components, etc., at a large distance from the hot metal housing.

A disadvantage of such a housing for accommodating a heating element of a laundry dryer is that a large number of components, including insulating foam and the like, are required. Furthermore, the amount of material used is very large, particularly in the case of aluminum die castings. In addition, the heating and cooling periods are very long. This results in a long drying cycle of the laundry disposed in the drum.

[ summary of the invention ]

The object of the present invention is to provide a clothes dryer heating apparatus which is cheaper to manufacture and preferably does not have the functional drawbacks described above.

This object is achieved by a laundry dryer heating apparatus having the features of claim 1.

The clothes dryer heating apparatus according to the present invention includes a housing defining a flow-through passage. At least one heating element is arranged in the flow-through channel. According to the invention, the shielding element is arranged between the heating element and the inner side of the flow-through channel, i.e. the inner wall of the housing. The shielding element shields the heat radiation emitted by the heating element so that the housing is heated to a lesser extent. This alone ensures that the housing is heated to a lesser extent, so that the operating efficiency of the clothes dryer heating apparatus is improved due to the reduced heating cycle in particular.

According to a particularly preferred embodiment of the laundry dryer heating apparatus according to the invention, the provision of the shielding element allows the housing to be made of, or at least to be provided comprising, a plastic material. The use of plastic materials has the advantage that: the plastic housing can be manufactured at a relatively low cost compared to housings made of metal materials, in particular aluminum die-cast housings. In addition, the production of the housing from a plastic material or a plastic composite material has the advantage that a product-specific configuration can be carried out. The shape of the housing can be adapted in a simple manner to the external conditions, such as the existing installation space.

As plastic materials, in particular thermoplastic materials are suitable, which can be processed by shape-imparting manufacturing processes (e.g. injection molding), thereby providing a high degree of freedom in design. As the thermoplastic material, polyamide, polystyrene and the like are suitable.

According to a preferred embodiment of the housing, the housing surrounds the at least one heating element in a tubular manner, wherein the cross section of the tube may have different shapes. Preferably, the housing is integrally formed at least in the region of one heating element. Also, the housing may be a multi-part configuration, wherein the separate housing parts are connected to each other, for example by welding.

The shielding element, which may be made of a plurality of parts, is arranged such that it completely surrounds the heating element radially, in particular with respect to the direction of flow. Thus, between the heating elements and the inner side of the flow-through channel, a shielding element is provided in radial direction, so that the heat radiation emitted by the at least one heating element is not directly fed to the inner side of the housing or to the flow-through channel defined by the housing. Thus, it is ensured that the plastic material is not heated to too great an extent.

The shielding element or at least a part of the shielding element can rest on the inner side of the flow-through channel, wherein in particular a complete abutment is possible. Here, it is necessary that the shielding element is made of or coated with a suitable material that provides a high shielding effect, so that only a small portion of the thermal energy is transferred into the plastic housing.

According to an advantageous aspect of the invention, the shielding element is at least partially configured such that it is arranged at a distance from the inner side of the flow-through channel. Thus, one or more bypass channels may be created. Air that is not or hardly heated when passing through the bypass passage flows through the bypass passage. Thereby, it is ensured that the heating of the plastic housing is limited to the maximum allowable temperature.

The cross-section of the bypass channel or the sum of the cross-sections of the bypass channels is smaller than the cross-section of the remaining flow-through channels, i.e. the cross-section through which the air flows and is heated by the heating element. In particular, the cross section of the bypass channel or the sum of the cross sections of the bypass channels is smaller than the remaining cross section of the flow-through channel, preferably smaller than a quarter of the remaining cross section of the flow-through channel, more preferably smaller than a tenth of the remaining cross section of the flow-through channel.

According to a preferred embodiment, the shielding element comprises an at least partly heat reflecting surface, or is made of a heat reflecting material. In particular, the surface or the entire shielding element is made of metal. Stainless steel or aluminum surfaces are particularly preferred with regard to a high degree of shielding against thermal radiation and good operating efficiency. As regards a high degree of shielding against thermal radiation, it is preferred to use a shielding element which is chrome-plated or gold-plated.

In addition, the present invention relates to a laundry dryer apparatus having a drum for receiving laundry to be dried. The roller is connected to the suction passage. The air extraction channel is connected to the laundry dryer heating apparatus as described above, wherein the air extraction channel is further particularly connected to the housing of the laundry dryer heating apparatus as described above. The laundry dryer heating apparatus, or in particular the casing thereof, is connected to the drum via an air supply channel, creating an air circuit. In particular, in the suction channel and/or in the air supply channel, fan elements are arranged, or connected to the respective channels, to realize an air circuit. In addition, in the extraction channel or between the drum and the extraction channel, or between the extraction channel and the laundry dryer heating apparatus, a condensation element may be arranged.

The laundry dryer heating apparatus arranged in the laundry dryer device is further developed in an advantageous manner as described above.

[ description of the drawings ]

The invention is explained in detail below on the basis of preferred embodiments with reference to the attached drawings, in which:

fig. 1 shows a schematic cross-sectional view of a first preferred embodiment of a laundry dryer heating apparatus;

FIG. 2 shows a schematic cross-sectional view along line II-II of FIG. 1;

figure 3 shows a schematic cross-sectional view of a second preferred embodiment of a laundry dryer heating apparatus;

FIG. 4 shows a simplified schematic diagram of a clothes dryer apparatus having the clothes dryer heating apparatus depicted in FIG. 1;

FIG. 5 shows a schematic cross-sectional view of another preferred embodiment of a clothes dryer heating apparatus;

FIG. 6 shows a schematic cross-sectional view of another preferred embodiment of a clothes dryer heating apparatus; and

fig. 7 shows a schematic cross-sectional view along line a-a of fig. 6.

[ detailed description ] embodiments

The laundry dryer heating apparatus according to the present invention comprises a casing 10, in particular made of plastic material, which casing 10 defines a flow-through channel 12. In the illustrated exemplary embodiment, air from the laundry drum flows in the direction of arrow 14.

Inside the flow-through channel 12 a heating element 16 is arranged. In the exemplary embodiment illustrated, the heating element 16 is surrounded by a shielding element 18 arranged between the heating element 16 and an inner side 20 of the flow-through channel 12. The heating element 16 preferably comprises a heat-reflecting coating on the inner side 22, which suitably prevents the heat radiation emitted by the heating element 16 from heating the shielding element 18 too strongly and ensures that the shielding element in turn emits only a small part of the thermal energy to the housing 10 by convection or thermal conduction, the housing 10 thus being heated only to a small extent.

In the preferred embodiment illustrated in fig. 1, the shielding element 18 is arranged at a distance from the inner side 20 of the housing 10 radially to the direction of flow 14, thereby defining a circumferential bypass channel 24. Air flows through the bypass passage 24. The air is not heated by the heating element 16 but flows in the flow direction 14 into a region 26 downstream of the heating element 16, where it mixes with the air heated by the heating element 16 in this region 26.

In the exemplary embodiment illustrated, the shielding element 18 comprises a curved guide element 28 in the region of the entrance of the bypass channel 24. By bending the guide element 28 and by the flow cross section of the bypass channel 24, the amount of air flowing through the bypass channel 24 can be adjusted.

In the illustrated embodiment, as can be seen in particular in fig. 2, the plastic housing 10 has a two-part structure and comprises an upper half-shell 30 and a lower half-shell 32 connected to one another, for example by welding. Inside the housing 10, a shielding element 18 is arranged, which shielding element 18 is also of a two-part construction, which shielding element 18 comprises an upper shielding element 34 and a lower shielding element 36. Inside the shielding element 18 a heating element 16 is arranged.

In an alternative embodiment illustrated in fig. 3, the same or similar components are denoted by the same reference numerals.

The essential difference of the embodiment illustrated in fig. 3 is that the shielding element 18 rests on the inner side 20 of the housing 10 and thus does not provide a bypass channel.

In the laundry dryer apparatus schematically illustrated in fig. 4, a laundry dryer heating device illustrated in fig. 1 and 2 is provided. The laundry dryer heating apparatus is connected via an air supply channel 38 as illustrated by the arrow to a drum 40 for receiving laundry to be dried. The drum 40 is connected to the laundry dryer heating apparatus via a suction channel 42. In the exemplary embodiment illustrated, a condenser 44 and a fan element 46 are arranged in the discharge channel 42.

As schematically illustrated in fig. 5, especially for laundry dryers without a fluff filter, it is particularly preferred that the curved guide element 28 is curved towards the casing 10 and/or that the inlet opening of the bypass channel 24 between the guide element 28 and the casing 10 is arranged such that it is protected from direct access to the flow in the main flow direction, so that no larger fluff or fluff agglomerates are fed into the bypass channel 24.

According to another preferred embodiment of the guiding element, in particular for laundry dryers without a lint filter, the guiding element is bent towards and against the casing 10, as schematically illustrated in fig. 6 and 7.

In this embodiment, the guide elements are preferably slotted/segmented, thereby again creating a bypass channel (fig. 7).

Claims

1. A clothes dryer heating apparatus, comprising:

a housing (10) defining a flow-through channel (12);

a heating element (16) arranged in the flow-through channel (12); and

a shielding element (18) arranged between the heating element (16) and an inner side (20) of the flow-through channel (12).

2. Laundry dryer heating apparatus according to claim 1, characterized in that the casing (10) comprises, in particular is made of, a plastic material.

3. Laundry dryer heating apparatus according to any one of claims 1 or 2, characterized in that the casing (10) surrounds the heating element (16) in a tubular manner, preferably being integrally formed at least in this region.

4. Laundry dryer heating apparatus according to any of claims 1 or 3, characterized in, that the shielding element (18) preferably rests completely against the inner side (20) of the flow-through channel (12).

5. Laundry dryer heating apparatus according to any of claims 1-4, characterized in that the shielding element (18) is arranged at least partially, i.e. in some areas, at a distance from the inner side (20) of the circulation channel (12).

6. Laundry dryer heating apparatus according to any of claims 1 or 5, characterized in that the shielding element (18) is at least partially arranged at a distance from the inner side (20) of the circulation channel (12) to define at least one bypass channel (24).

7. Laundry dryer heating apparatus according to any one of claims 1-6, characterized in that the shielding element (18) completely surrounds the heating element (16), preferably radially to the circulation direction (14).

8. Laundry dryer heating apparatus according to claim 6 or 7, characterized in, that the cross section of the bypass channel (24) or the sum of the cross sections of the bypass channels is smaller than the cross section of the remaining flow-through channel (12).

9. Laundry dryer heating apparatus according to any of claims 1-8, characterized in that the shielding element (18) comprises an at least partially heat reflective surface (22).

10. Laundry dryer heating apparatus according to claim 9, characterized in that said surface (22) is metallic.

11. A clothes dryer apparatus comprising:

a drum (40) for receiving laundry to be dried;

an air extraction channel (42) connected to the drum (40);

-a laundry dryer heating apparatus according to any of claims 1 to 10 connected to said suction channel (42); and

an air supply channel (38) connecting the laundry dryer heating apparatus and the drum (40).

12. Laundry dryer apparatus according to claim 11, characterized in that in the suction channel (42) and/or in the air supply channel (38) a fan element (46) is arranged and/or connected.

13. Laundry dryer apparatus as in any one of claims 11 or 12, characterized in that in said suction channel (42), or between said drum (40) and said suction channel (42), or between said suction channel (42) and said laundry dryer heating device, a condensing element (44) is arranged.