CN112239941B - Household appliance filter and household appliance with same - Google Patents

Household appliance filter and household appliance with same Download PDF

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Publication number
CN112239941B
CN112239941B CN202010668364.2A CN202010668364A CN112239941B CN 112239941 B CN112239941 B CN 112239941B CN 202010668364 A CN202010668364 A CN 202010668364A CN 112239941 B CN112239941 B CN 112239941B
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China
Prior art keywords
filter
household appliance
layer
clogging
surface energy
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CN202010668364.2A
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CN112239941A (en
Inventor
R·伯梅尔斯
H·亨尼希
M·马尼希
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BSH Hausgeraete GmbH
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BSH Hausgeraete GmbH
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Classifications

    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06FLAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00Domestic laundry dryers
    • D06F58/20General details of domestic laundry dryers 
    • D06F58/22Lint collecting arrangements

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Filtering Materials (AREA)

Abstract

A household appliance filter (3) has at least in sections (6) at least one solid filter layer (7) made of a clogging-reducing filter material (8) having a material-dependent surface energy of 35mN/m or less. The household appliance (2) has at least one household appliance filter (3). The invention can be applied in particular to laundry care appliances, in particular laundry drying appliances.

Description

Household appliance filter and household appliance with same
Technical Field
The invention relates to a household appliance filter having a filter layer with a filter material having a surface energy of 35mN/m or less. The invention also relates to a household appliance having at least one such household appliance filter. The invention is particularly advantageously applicable to laundry care appliances, in particular laundry drying appliances.
Background
Laundry dryers with process air channels equipped with process air filters are known. During the drying process, fluff and other particles (hereinafter also referred to simply as particles) that fall off from the laundry to be dried are carried along with the process air stream. The process air filter serves in particular to filter out particles from the process air flow, which would otherwise disadvantageously spread into the functional area of the laundry dryer and deposit there, for example on the cooling ribs of the heat exchanger. Such filters currently have PET (polyethylene terephthalate) fabric as filter material or filter medium.
In order to avoid that the process air filter is plugged with particles deposited thereon and then blocks the process air channel, it is also known to automatically clean the filter by means of a flushing device by loading with water. The water can in particular be a condensate which accumulates on drying. Due to this appliance side cleaning, the user no longer has to manually clean the filter after each drying process.
However, in this purification, temporary infiltration of water into the filter openings can disadvantageously occur between condensate and the process air filter under defined environmental conditions. This results in a high flow resistance of the process air, so that a sufficient process air volume flow for the drying function can no longer occur. The filter is "plugged". This creates significant disadvantages for the runnability and the working capacity of the laundry dryer.
DE 10 2008 055 086 A1 discloses a laundry dryer having a screen for screening out solids, in particular fluff, from a process air duct of the laundry dryer and having a cleaning device for cleaning the screen, wherein the screen is arranged obliquely at an angle in a space. The method is used for cleaning a screen of a laundry dryer by means of a cleaning device (for cleaning the screen), wherein the screen is arranged obliquely at an angle in the space and the cleaning liquid is guided through the obliquely inserted screen. The fluff screen material is preferably composed of metal or has metal. For use in a wet environment such as in a laundry dryer or washing machine, the fluff screen material can consist of a corrosion-resistant material, in particular a corrosion-resistant material that resists the action of washing liquid or water. As a fluff screen material, high-grade steel or aluminum can be used which is resistant to temperature changes and can be, if appropriate, simply hydrophobically coated with suitable installation materials. Such hydrophobic means can be constructed as a nano-lacquer and/or cause lotus effect on or at the fleece screen material. The fluff screen material with equipment can be present as a fabric, a non-buckling fabric (gelage) or as a perforated film or sheet.
EP 2 202.348 A2 discloses a household appliance screen made of a screen base material having a hydrophobic coating for screening out solids, in particular fluff, from a process water channel or a process air channel, wherein the screen base material consists of a material which is durable at 160 ℃ or more, wherein the hydrophobic coating causes a surface energy of less than 35mN/m, in particular less than 28mN/m, on or at the screen base material.
DE 10 2008 010 517 A1 discloses a household appliance for drying laundry, in particular a laundry dryer or a laundry dryer, having a component which can be circulated by process air, wherein the component has a substrate made of metal or plastic, which has a surface facing the process air. The surface has a coating that prevents foreign particles from adhering.
DE 10 2008 041 998 A1 discloses a dryer comprising a drying chamber for receiving moist objects and a substantially closed process air guide for circulating process air through the drying chamber, the process air guide having a heat source for heating the process air before it enters the drying chamber and a heat-reducing portion for cooling the process air after it exits the drying chamber, and a first fluff filter arranged between the drying chamber and the heat-reducing portion for collecting fluff from the process air, the first fluff filter being provided with a first cleaning device. The first cleaning device has a collector for liquid, a first flushing pipe connected to the collector, a first control mechanism in the first flushing pipe and a first dispenser connected to the first flushing pipe for dispensing liquid delivered through the first flushing pipe onto the first lint filter and for receiving lint collected by the first lint filter, a first delivery pipe for delivering liquid with the received lint from the first lint filter to the collector. The filter fabric of the fluff filter has at least one property from the group comprising hydrophobic, dirt-repellent and antibacterial properties. All the mentioned properties can be imparted to the filter fabric by means of a corresponding coating, wherein the coating can consist of a water-repellent or plasma coating.
Disclosure of Invention
The object of the present invention is to at least partially overcome the disadvantages of the prior art. In particular, the object is to provide a household appliance filter which can be produced inexpensively and which can be cleaned particularly simply and which also exhibits a low probability of water penetrating into its filter openings over a long period of time.
This object is achieved according to the features of the invention. Advantageous embodiments are the subject matter of the technical solutions, the description and the figures of the present invention.
This object is achieved by a household appliance filter having at least in part a solid filter layer made of a clogging-reducing filter material having a material-dependent surface energy of 35mN/m or less. Next, a filter material having a surface energy of 35mN/m or less is also referred to as "clogging-reducing filter material" without general limitation.
The following are used here: the occurrence of the effect of temporary penetration of the filter material by the condensate is decisively influenced by the surface energy properties of the filter material used and the wettability of the water associated therewith: the more different the surface tension between condensate (water) and filter material, the less undesired wetting of the filter material occurs.
It has been shown that at a surface energy of 35mN/m or less or not more than 35mN/m of the clogging-reducing filter material, the filter installed in the washware drying apparatus is significantly less clogged with condensate/water during the cleaning process than in the case of using PET having a surface energy of about 43mN/m as the filter material. That is, the effect of water temporarily penetrating the filter opening can be avoided and thus the operational performance and the working capacity of the household appliance are maintained under the following conditions: such conditions can lead to a significant impairment of the working capacity of the household appliance in the case of filters having the conventional manifestation of PET fabric.
A completely solid filter layer is understood to mean, in particular, the following layers: the layers are entirely made of a filter material that reduces clogging. That is, the clogging-reducing filter material is not present as a coating layer of the base material, but is present as a layered solid body with additives or inclusions as necessary. The filter openings are located in the filter layer. The use of a solid filter layer gives rise to the following advantages with respect to the coating: which can be manufactured more simply and less expensively. The solid filter layer does not flake off the base material as does the coating. Furthermore, later processing can be performed more precisely and more variously in solid materials than in coated base materials.
A layer is understood to mean, in particular, the following geometry: the height or thickness of the geometry is significantly smaller, in particular at least ten times smaller, than the extension of its plane. The layer can in particular be a layer having a thickness of not more than 1mm, in particular not more than 0.5mm, in particular not more than 0.25mm, in particular not more than 0.1 mm. The layer can be a film.
The household appliance filter can also have a layer stack consisting of at least two layers, of which at least one layer is a solid filter layer. At least one further layer can be used for other functions, for example as a carrier or the like. In particular, the household appliance filter can have a plurality of filter layers of solid bodies stacked directly or indirectly one above the other.
The surface energy of a filter material that reduces clogging is understood to be "material dependent surface energy" and is thus a material property. Not the following surface energies: the surface energy results from a targeted micro-structuring of the surface of the filter layer, for example for creating a lotus effect. The following advantages are achieved: the strongly reduced wear of the associated surface energy, which frequently occurs in microstructuring, does not currently occur, since the material itself has and also maintains a desirably small surface energy. Basically, however, the microstructure can also be provided to further reduce the surface energy.
The surface energy of a filter material that reduces clogging is particularly related to its free surface energy (SFE). The surface energy of water assumes a value of about 73 mN/m.
The household appliance filter is in particular a household appliance filter provided for arrangement in a process air channel of a laundry drying appliance. However, the filter is not limited thereto and can, for example, also be provided for arrangement in a process air channel and/or in a process liquid channel of other household appliances.
One configuration is that the material-dependent surface energy of the plug-reducing filter material is or yields 30mN/m or less, in particular 25mN/m or less, in particular 20mN/m or less.
One configuration is that the plug-reducing filter material is a polymeric material, i.e., one or more polymeric types. Such a polymer material can be produced in a layered manner, particularly simply and inexpensively.
One configuration is that the clogging-reducing filter material is or has PTFE (polytetrafluoroethylene), PVDF (polyvinylidene fluoride), PC (polycarbonate), PE (polyethylene) and/or PP (polypropylene). This is particularly advantageous because these materials typically have significantly less surface energy than PET, can be easily processed and are widely available. Thus, the difference in surface energy from water is significantly greater than in the case of "water/PET". That is, in the materials listed above, the surface is significantly less wetted by water than in the case of PET, which advantageously affects the penetration. This applies in particular to PTFE (SFE of about 18mN/m-20 mN/m) and PVDF (about 25mN/m-32 mN/m). Furthermore, the two materials mentioned last are particularly resistant and durable in terms of heat and chemistry. Particularly in the case of PTFE as filter material, the filter openings can be completely prevented from being blocked by water.
In one embodiment, the filter face of the filter has at least one filter layer made of a clogging-reducing filter material over the entire face. This enables a particularly simple production and particularly effective protection of the filter openings from water. The filter surface can be understood in particular as a surface with a filter function which is present in a vertical plan view of the household appliance filter. Such a filter is also referred to as a "full filter" in the following.
One configuration is that the filter face of the filter has at least one filter layer made of a clogging-reducing filter material only partially or partially. The remaining part-face can be made of (other) filter material having a surface energy of more than 35mN/m, such as PET fabric. This is used here: only a relatively small, non-penetrating filter (part) surface is generally required in order to maintain the running course of the household appliance also when efficiency is significantly reduced when necessary. Such a filter is also referred to as a "hybrid filter" in the following. Such a hybrid filter can have the following advantages: it is cheaper than a full filter. Alternatively or additionally, the following may be advantageous: other filter materials have a higher air throughput than filter materials with reduced clogging during normal operation (outside of being wetted with water), so that the hybrid filter also has a higher air throughput than the full filter. Other filter materials can have a surface energy of, for example, 40mN/m or more.
In one embodiment, the surface portion of the filter material or of the at least one associated filter layer that reduces clogging corresponds to no more than 90%, in particular no more than 80%, in particular no more than 70%, in particular no more than 60%, in particular no more than 50%, in particular no more than 40%, in particular no more than 30%, in particular no more than 20%, in particular no more than 10%, of the entire filter surface of the filter.
One configuration is that the solid filter layer is an extruded layer. This configuration yields the following advantages: the filter layer has no coverage or crossing of individual threads compared to a fabric, but rather a relatively smooth surface on which particles adhere poorly, which in turn is advantageous for appliance-side cleaning and for cleaning by the end user. That is, advantageously, a smaller increase in pressure loss of the filter between maintenance intervals also occurs with a trend. Furthermore, the production by means of extrusion can be carried out particularly inexpensively.
One configuration is that the filter opening is introduced later into the closed surface of the material layer of the solid body or that the filter opening is a filter opening introduced later. The subsequent introduction can be effected, for example, by cutting in (einchneiden), stamping, lasing and is produced from a material layer of the filter layer. The latter introduction achieves a particularly accurate or precise shaping of the filter openings. For example, the filter opening can be produced by a slit and a joined, opposing bead of the opposing edges of the slit.
In one embodiment, the filter opening can have a maximum extent of 1mm, in particular 0.75 mm.
The material layer can be a layer produced in a belt-like manner, in particular a material layer separated from a continuous belt or a quasi-continuous belt.
The object is also achieved by a household appliance having at least one household appliance filter as described above. The household appliance filter can be constructed similarly to the filter and has the same advantages.
One configuration is that the household appliance is a laundry drying appliance and the household appliance filter is arranged as a particle filter or a lint screen in the process air duct. Better energy performance of the laundry dryer is achieved by the household appliance filter, and the expanded possibility of configuration of the method technology of the drying process is achieved. Laundry drying appliances in particular have a rinsing device for automatically cleaning a household appliance filter with water, in particular condensate.
The laundry dryer can be a pure laundry dryer or a combined washing/drying appliance ("washer dryer").
However, the present invention is not limited to this: the filter can also be provided, for example, as a filter for blocking particles from condensate or other liquids before the condensate flows into the collecting tank. In addition, the filter can be used in other types of home appliances such as washing machines, and the like.
In one embodiment, the laundry dryer has a heat pump. This can be advantageous in particular if only a partial region of the filter surface has a material layer of the filter material or of the at least one solid body which reduces clogging and is otherwise made of, for example, PET fabric. This is used here: it has proven that only a relatively small filter (partial) surface which is not penetrated is required in order to achieve a process air volume flow which avoids the so-called freezing of the heat exchanger. The partial surface occupied by the filter material to reduce clogging can in particular be less than half of the entire filter surface, in particular less than 40%, in particular less than 30%, in particular less than 25%, in particular less than 20%, in particular less than 10% of the entire filter surface.
Drawings
The above-described features, features and advantages of the present invention, and the manner in which they are accomplished, are more readily apparent and more readily understood in connection with the following schematic description of the embodiments, which are to be explained in more detail in connection with the accompanying drawings.
Fig. 1 shows a top view as a sectional illustration of a process air duct of a laundry dryer appliance with an incorporated household appliance filter; and
fig. 2 shows a photograph of a microscope of the filter layer in an oblique view.
Detailed Description
Fig. 1 shows a process air duct 1 of a laundry dryer 2 in a plan view as a sectional illustration, with an integrated household appliance filter in the form of a particle filter or lint screen 3. The laundry dryer 2 may be a laundry dryer equipped with a heat pump (not shown) or a washing dryer. The fluff screen 3 can be arranged obliquely in the process air channel 1, but is currently installed horizontally. The fluff screen 3 has an outer annular frame 4, by means of which it is inserted into the process air duct 1.
The fleece screen 3 has filter surfaces 5, 6 in plan view, which have two partial surfaces: namely an annular outer part surface 5 which is connected to the frame and an intermediate annular inner part surface which is surrounded by the outer part surface 5. The inner partial surface 6 is smaller than the outer partial surface 5 and is, for example, only 30% or less of the entire filter surface 5, 6.
The outer partial surface 5 consists of PET fabric, while the inner partial surface 6 has at least one filter layer 7, which is produced in solid form from PTFE as filter material by extrusion. PTFE has a surface energy (SFE) of between 18mN/m and 20mN/m, which is material dependent.
Fig. 2 shows a view of the filter layer 7 in oblique view through a microscope. The filter layer 7 is formed as a thin layer of PTFE 8, into which the filter openings 9 are later introduced. The filter layer 7 has a relatively smooth surface in which no individual filament crossings occur, in particular in comparison with a fabric.
The invention is naturally not limited to the embodiments shown.
Generally, the word "a" or "an" can be understood as singular or plural, especially in the sense of "at least one" or "one or more" etc., as long as this is not explicitly excluded (e.g. by the term "exactly one" etc.).
The numerical description can include both the exact numbers described and the general ranges of tolerance, provided that this is not explicitly excluded.
List of reference numerals
1 Process air channel
2 washing drying appliance
3 velvet Mao Shai
4 frame
5 partial surface of the filter surface
6 inner partial surface of filter surface
7 Filter layer
8PTFE layer
9 Filter opening

Claims (10)

1. A household appliance filter (3) having at least in sections (6) at least one solid filter layer (7) made of a clogging-reducing filter material (8) having a material-dependent surface energy of 35mN/m or less,
wherein the solid filter layer (7) is an extrusion-produced layer, and
wherein the filter openings (9) of the filter layer (7) are filter openings which are introduced later.
2. A household appliance filter (3) as claimed in claim 1, wherein the material-dependent surface energy of the clogging-reducing filter material (8) is 30mN/m or less.
3. The household appliance filter (3) as claimed in any one of the above claims, wherein the clogging reducing filter material (8) has PTFE and/or PVDF.
4. The household appliance filter (3) according to claim 1 or 2, wherein the filter face of the household appliance filter (3) has at least one filter layer (7) made of the clogging-reducing filter material (8) over the whole face.
5. A household appliance filter (3) according to claim 1 or 2, wherein the filter face (5, 6) of the household appliance filter has at least one filter layer (7) made of the clogging-reducing filter material (8) only partly face-wise (6).
6. A household appliance filter (3) as claimed in claim 2, wherein the material-dependent surface energy of the clogging-reducing filter material (8) is 25mN/m or less.
7. A household appliance filter (3) as claimed in claim 2, wherein the material-dependent surface energy of the clogging-reducing filter material (8) is 20mN/m or less.
8. A household appliance (2) having at least one household appliance filter (3) as claimed in any one of the above claims.
9. The household appliance (2) according to claim 8, wherein the household appliance (2) is a laundry drying appliance and the household appliance filter (3) is arranged in a process air channel (1) of the laundry drying appliance.
10. The household appliance (2) according to claim 9, wherein the laundry drying appliance has a heat pump.
CN202010668364.2A 2019-07-17 2020-07-13 Household appliance filter and household appliance with same Active CN112239941B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019210546.7A DE102019210546A1 (en) 2019-07-17 2019-07-17 Household appliance filter and household appliance with it
DE102019210546.7 2019-07-17

Publications (2)

Publication Number Publication Date
CN112239941A CN112239941A (en) 2021-01-19
CN112239941B true CN112239941B (en) 2024-02-06

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EP (1) EP3767026B1 (en)
CN (1) CN112239941B (en)
DE (1) DE102019210546A1 (en)

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Publication number Priority date Publication date Assignee Title
GB0010417D0 (en) * 1999-05-27 2000-06-14 Bsh Bosch Siemens Hausgeraete Air flow filtration in a laundry drier
EP2202348A2 (en) * 2008-12-22 2010-06-30 BSH Bosch und Siemens Hausgeräte GmbH Household device sieve, household device with such a sieve and method for producing such a sieve
CN102059027A (en) * 2010-10-31 2011-05-18 房县诚信汽配有限责任公司 Dust-free fiber deep filtration filter element
CN105228731A (en) * 2013-03-15 2016-01-06 佩科平面美国公司 The surface energy non-woven filter element of modification
CN107002343A (en) * 2014-12-16 2017-08-01 伊莱克斯家用电器股份公司 Garment drying apparatus with filter system
CN109154128A (en) * 2016-05-11 2019-01-04 Bsh家用电器有限公司 The manufacturing method of the household appliance of functional property coating mesh screen, mesh screen and mesh screen used in it
CN108729105A (en) * 2017-04-25 2018-11-02 青岛海尔洗衣机有限公司 The drying system and washing machine of washing machine

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Publication number Publication date
EP3767026B1 (en) 2023-09-06
CN112239941A (en) 2021-01-19
EP3767026A1 (en) 2021-01-20
DE102019210546A1 (en) 2021-01-21

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