EP2351882A2 - Wäschebehandlungsmaschine mit einem Druckschalter, insbesondere einem Lineardruckschalter - Google Patents
Wäschebehandlungsmaschine mit einem Druckschalter, insbesondere einem Lineardruckschalter Download PDFInfo
- Publication number
- EP2351882A2 EP2351882A2 EP10196442A EP10196442A EP2351882A2 EP 2351882 A2 EP2351882 A2 EP 2351882A2 EP 10196442 A EP10196442 A EP 10196442A EP 10196442 A EP10196442 A EP 10196442A EP 2351882 A2 EP2351882 A2 EP 2351882A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure switch
- tub
- machine
- machine according
- drum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007788 liquid Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 101150114468 TUB1 gene Proteins 0.000 description 17
- 238000005406 washing Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 230000005294 ferromagnetic effect Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00
- D06F39/08—Liquid supply or discharge arrangements
- D06F39/087—Water level measuring or regulating devices
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/18—Washing liquid level
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/26—Imbalance; Noise level
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
- D06F33/48—Preventing or reducing imbalance or noise
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
- D06F34/16—Imbalance
Definitions
- the present invention relates to a laundry treating machine comprising a pressure switch, in particular a linear pressure switch.
- laundry treating machine refers to a machine in which a drum housed in a tub is loaded with laundry which is then subjected to a washing treatment, a drying treatment or the like.
- Some examples of such machines are washing machines, washing/drying machines and clothes dryers.
- a method known in the art employs a pressure sensor connected to the tub by means of a tube which opens, at an intake point, into the tub itself, preferably in the lowest portion thereof.
- Said pressure sensor detects the pressure of the liquid column over the intake point, thus making possible to know the level of the liquid surface and therefore the tub filling level.
- a pressure sensor comprises a bell with an open lower edge close to the bottom of the tub; at its upper end, the bell communicates with a linear pressure switch through a tube, preferably a flexible hose.
- Said linear pressure switch is a transducer device of a per se known type, in which a diaphragm is deformed by the pressure variation and causes a ferromagnetic element to move linearly, thereby altering the magnetic field of a coil associated therewith and inducing a corresponding voltage signal, which is then processed into a modulated form (per se known) by an electronic circuit associated with the coil, and is finally transmitted to a control unit.
- Linear pressure switches like the one described above are commercially available in Italy from companies ITW Metalflex, Invensys and Bitron.
- the measurement takes place as follows: as the wash liquid level in the tub changes, the level inside the bell changes as well, thereby determining a variation in the pressure of the air contained in the bell, which variation is then transmitted to the linear pressure switch through the tube.
- the pressure switch detects pressure variations and sends a corresponding modulated voltage signal of the PWM (Pulse Width Modulation) type to the control unit.
- PWM Pulse Width Modulation
- the output signal generated by the linear pressure switch and then sent to the control unit is a frequency-modulated signal, to do this an oscillator circuit known in the art is associated with the linear pressure switch.
- the linear pressure switch is typically located at the top and is connected to the machine frame to which the tub is also coupled, and the air-filled tube which transmits pressure variations runs from the bell in the tub to the linear pressure switch by following a rather long and sometimes winding path.
- the tortuosity of the path followed by the tube is due to the necessity of preventing it from touching functional elements of the machine, such as frame, motor or duct parts, so as to avoid the risk that it may wear out when subjected to normal operating vibrations.
- Another drawback derives from the fact that the two points where the tub is secured are subject, in operation, to different movements (the pressure switch is secured to the frame, whereas the tub is secured to the oscillating assembly by means of dampers and/or springs): the tube therefore moves and generates noise, and there is also the risk that the tube itself may get detached or damaged.
- this arrangement requires quite complex assembling steps, since the tube must be positioned on and secured to both the tub and the frame: as aforementioned, the latter are subject to different movements when the machine is in operation, so that it is appropriate to pay particular attention to mounting the tube in a manner such that it will not stretch in use, while also ensuring that it is not too loose and cannot get in touch with machine parts which might wear it out by friction.
- the present invention aims at overcoming these and other drawbacks by providing a laundry treating machine fitted with a frame and an associated oscillating assembly which comprises a tub that houses a drum, the machine also comprising a pressure sensor of the type fitted with at least one pressure switch, wherein the pressure sensor is associated with the oscillating assembly, preferably with the tub.
- linear pressure switch is mounted to the tub in a manner such that the duct connecting it to the latter is short and straight. Any load losses are thus extremely small and the measurement is extremely accurate.
- the present invention also relates to a method for detecting operating vibrations of a laundry treating machine, as per claim 9.
- FIG. 1 there is shown a portion of a tub 1 of a laundry treating machine according to the present invention.
- the laundry treating machine is usually fitted with a frame (not shown) with which an oscillating assembly is associated, which comprises a tub 1 that houses a drum (not shown).
- the machine frame may be provided in several forms but, for the purposes of the present invention, suffice it to say that it is that part of the machine which rests on the floor and supports the tub 1, the latter being coupled thereto by means of vibration dampers and/or springs.
- the tub 1 houses the drum that contains the laundry, and has an aperture which allows the laundry to be inserted into the drum.
- the machine of the present invention also comprises a pressure switch 2 adapted to detect the pressure of the wash liquid in the tub and to send a signal to an electronic control unit as previously described in order to identify the liquid level.
- the pressure switch 2 is secured to the oscillating assembly of the machine.
- the pressure switch 2 is mounted directly to the tub 1 through fastening means 3A,3B, which will be discussed later on.
- this arrangement allows the pressure switch 2 to be installed into the machine in an extremely simple manner, without the vibrations of the oscillating assembly affecting the reading or impairing the connection between the pressure switch and the measuring point.
- FIGs. 3 and 4 there is shown a detail of the pressure switch 2 and a cross-section of the tub 1 at the measuring point 4.
- the measuring point 4 is located in the lowest portion of the tub 1.
- the tub shape with a bell-shaped portion provides the additional advantage that the machine production process is further simplified.
- the measuring point 4 inside the bell must not be wetted by the wash liquid contained in the tub 1 for the diaphragm of the pressure switch 2 to remain dry.
- the tub 1 has a hole in which the intake duct 5 is inserted, and tightness is ensured between the two parts by a gasket 29 interposed at the interface thereof.
- the intake duct 5 is in practice a rigid pipe, typically made of plastic material, advantageously made in one piece with the shell of the pressure switch 2 and extending perpendicularly to the diaphragm 6 for a total length being the minimum length required for said duct 5 to be able to act as a collar ensuring a hydraulic seal; preferably, said length is in the order of a few centimetres, more preferably it is shorter than 5 cm.
- the gasket 29 ensures the necessary tightness between the duct 5 and the tub 1. Furthermore, aiming at advantageously prevent any load losses which might affect the reading and at making the assembly process easier, the duct 5 substantially extends in a straight line; more in particular, the straight direction of extension of the duct 5 coincides with the direction in which the pressure switch 2 must be mounted to the tub 1, so that the pressure switch can be mounted and secured with just a single move.
- the diaphragm 6 is deformed through the effect of pressure variations and causes a ferromagnetic piston (not shown) to move linearly, thereby altering the magnetic field of a coil (not shown) associated therewith and inducing a corresponding voltage signal, which is then processed into a modulated form (per se known) by an electronic circuit (not shown) associated with the coil, and is finally transmitted to a control unit (not shown) of the machine.
- the linear pressure switch 2 can be used for controlling the laundry treating machine whereto it is applied, in particular for the following functions:
- a pressure switch of this kind directly secured to the oscillating assembly or to the tub advantageously offers added functionality.
- the linear pressure switch can be used as a sensor for detecting the balance of the oscillating assembly, in particular when the machine is operating at high drum rotation speeds (e.g. at the beginning of a spin cycle).
- the deformation of the diaphragm is translated into a frequency value (e.g. by means of an oscillator circuit), a given frequency value corresponding to a given pressure value.
- the pressure switch output frequency In the absence of any significant vibration, the pressure switch output frequency is substantially stable; on the contrary, the frequency fluctuates when the diaphragm 6 is subject to vibration.
- a plurality of frequency values are measured within a predetermined time interval. Since unbalance is due to eccentricity of the load in the drum, said eccentricity is read for a number of times such that the unbalance measurement obtained is sufficiently accurate. For example, assuming a spin cycle speed of 1,200 rpm, a time interval of 1 second may be sufficient because it allows the sampling of 20 fluctuations.
- the average value among said frequency values is then calculated, followed by the value of the difference between the peak frequency value and the average value.
- the average value leads to know the pressure exerted by the wash liquid onto the diaphragm 6, whereas said difference leads to know the unbalance of the load.
- any unbalance of the oscillating assembly By detecting the frequency of the signals generated by the pressure switch, it is therefore also possible to detect any unbalance of the oscillating assembly, and possibly such data can be used to eliminate or reduce said unbalance below a limit value by stopping or slowing down the drum so as to obtain a different distribution of the laundry therein. This step may be repeated several times until the distribution of the laundry in the drum is sufficiently balanced and such as to avoid damages to the structure of the machine during the next spin cycle.
- the pressure switch 2 comprises an outer shell 20 with which a first part of a fastening means 3A is associated, the latter being snap-coupled to a matching second part 3B provided on the tub.
- This snap-on engagement allows the pressure switch 2 to be easily mounted into its seat, while at the same time ensuring that the duct 5 is correctly plugged into the tub 1 and cannot come off.
- the first part of the fastening means 3A comprises an eyelet 30A with two positioning fins 31A on both sides.
- the second part of the fastening means 3B associated with the tub, is provided with two teeth 30B having at their ends two wedge-shaped reliefs facing each other and adapted to snap into the eyelet 30A in the assembled condition, thus preventing it from coming off.
- the second part of the fastening means 3B also comprises two alignment slots 31B which allow the two positioning fins 31A to slide as the pressure switch 2 is being mounted to the tub 1, so that the duct 5 is properly inserted into the tub hole and cannot be damaged during the assembly step.
- the fins 31A slide in the alignment slots 31B in a direction parallel to the direction of insertion of the intake duct 5 into the hole of the tub 1; the slots 31B are provided in the form of through apertures between the teeth 30B and a support structure or bracket 10 integral with the tub and adapted to support the pressure switch 2.
- the slots 31B have a substantially rectangular shape and are open on the side not facing the tub 1 to allow for the insertion of the fins 31A.
- assembling the pressure switch 2 is thus extremely simple and does not require the use of threaded connections or the like; in fact, it is sufficient to insert the fins 31A into the corresponding slots 31B and bring the pressure switch near the tub 2: at the end of its travel, the teeth 30B will engage with the edge of the eyelet 30A, thereby securing it in position.
- fastening means 3A and 3B are also conceivable, which may be chosen and adopted by the man skilled in the art without departing from the scope and teachings of the present invention.
- the means 3A and 3B respectively associated with the pressure switch 2 and the tub 1 are reciprocated.
- the pressure switch 2 is coupled to the oscillating assembly, but not directly to the tub; to this end, the pressure switch 2 or its bracket 10 may be associated with the motor of the machine (if the motor is fastened to the oscillating assembly) or to other parts of the oscillating assembly itself, such as pipes, ducts, support bracket or the like.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Control Of Washing Machine And Dryer (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
- Treatment Of Fiber Materials (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT001034A ITTO20091034A1 (it) | 2009-12-23 | 2009-12-23 | Macchina per il trattamento di panni comprendente un pressostato in particolare un pressostato lineare. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2351882A2 true EP2351882A2 (de) | 2011-08-03 |
EP2351882A3 EP2351882A3 (de) | 2012-08-22 |
EP2351882B1 EP2351882B1 (de) | 2015-08-05 |
Family
ID=42543260
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10196442.7A Not-in-force EP2351882B1 (de) | 2009-12-23 | 2010-12-22 | Wäschebehandlungsmaschine mit einem Druckschalter, insbesondere einem Lineardruckschalter |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2351882B1 (de) |
IT (1) | ITTO20091034A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20240247424A1 (en) * | 2023-01-23 | 2024-07-25 | Whirlpool Corporation | Microparticle filtration detection for a laundry appliance |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1293962B1 (it) * | 1997-08-11 | 1999-03-15 | Elbi Int Spa | Macchina operatrice ed utilizzo di un trasduttore di pressione in una macchina operatrice. |
JP4635391B2 (ja) * | 2001-08-02 | 2011-02-23 | 株式会社デンソー | 圧力センサの取付け構造 |
KR20050111660A (ko) * | 2004-05-21 | 2005-11-28 | 삼성전자주식회사 | 세탁기 |
JP2007315792A (ja) * | 2006-05-23 | 2007-12-06 | Mitsubishi Electric Corp | 圧力センサの取り付け構造 |
DE102007040080A1 (de) * | 2007-08-24 | 2009-02-26 | BSH Bosch und Siemens Hausgeräte GmbH | Vorrichtung und Verfahren zur Ermittlung eines Füllstandes innerhalb eines Laugenbehälters einer Waschmaschine |
-
2009
- 2009-12-23 IT IT001034A patent/ITTO20091034A1/it unknown
-
2010
- 2010-12-22 EP EP10196442.7A patent/EP2351882B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
None |
Also Published As
Publication number | Publication date |
---|---|
EP2351882B1 (de) | 2015-08-05 |
EP2351882A3 (de) | 2012-08-22 |
ITTO20091034A1 (it) | 2011-06-24 |
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