EP1300503A1 - Générateur de vapeur ayant un affichage de niveau d'eau - Google Patents
Générateur de vapeur ayant un affichage de niveau d'eau Download PDFInfo
- Publication number
- EP1300503A1 EP1300503A1 EP02356183A EP02356183A EP1300503A1 EP 1300503 A1 EP1300503 A1 EP 1300503A1 EP 02356183 A EP02356183 A EP 02356183A EP 02356183 A EP02356183 A EP 02356183A EP 1300503 A1 EP1300503 A1 EP 1300503A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- level
- tank
- steam
- steam generator
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000005070 sampling Methods 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 15
- 229910052742 iron Inorganic materials 0.000 abstract description 7
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 238000010409 ironing Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000002604 ultrasonography 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
- D06F75/00—Hand irons
- D06F75/08—Hand irons internally heated by electricity
- D06F75/10—Hand irons internally heated by electricity with means for supplying steam to the article being ironed
- D06F75/12—Hand irons internally heated by electricity with means for supplying steam to the article being ironed the steam being produced from water supplied to the iron from an external source
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/28—Methods of steam generation characterised by form of heating method in boilers heated electrically
- F22B1/284—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs
Definitions
- the present invention relates to steam generators comprising a tank previously filled with water and then heated to produce steam at a pressure higher than atmospheric pressure.
- Such generators economical because they are manual filling, are used to supply irons or other appliances with steam household.
- the generally metallic tank has a filling opening provided a plug, a vapor withdrawal orifice usually provided with a solenoid valve, a heating element, one or more temperature sensors or pressure regulator, and safety devices.
- Sensors which can be associated with the regulation, are able to detect the absence of water in the tank and consequently to light an indicator.
- This useful device for the user confirms the origin of a pressure drop, in inviting him to recharge his generator with water. She must then interrupt her work, allow the device to cool to reduce the residual pressure, open the cap, reload the tank with water and wait for a new temperature.
- Reading the water level in the tank would allow the user to anticipate the remaining time of ironing and make arrangements accordingly. However, it is not possible to read the level through the opaque wall of the tank.
- a vertical or oblique transparent tube connected to the tank allows to visualize the level, but in addition to being a technically delicate device for a household appliance, it builds up and quickly becomes illegible. So you need a device comprising an indirect determination of the level and a display, for solve this problem.
- Determining the level of hot water under variable pressure and temperature can be done by plunger devices such as that described in the patent US3992941. But these devices require delicate moving parts and little compatible with household appliances.
- the object of the following invention is an economical steam generator, the tank is manual filling and which includes a device for determining and display of the water level not having the disadvantages mentioned.
- Level of water can be expressed in height of water in the tank, in remaining volume, or in mass of water remaining in the tank, these values being physically linked.
- the object of the invention is achieved by a steam generator comprising a tank intended to be filled with water and then heated to produce a steam at a pressure higher than atmospheric pressure, a device remarkable electronic water level determination and display in that the device for determining the water level comprises means to calculate an initial water level, based on the temperature curve of first warm-up, means to calculate at each sample the product of the mass flow rate of water vapor over time corresponding to the mass of water taken in the form of vapor, and means for calculating each residual water level.
- the electronic device includes a tank temperature sensor. It is preferable to use the sensor used simultaneously to regulate the temperature or, in an equivalent and simultaneous manner, the pressure.
- the duration t at the start of heating can be quite long, the temperature difference large, which gives good accuracy to the calculation, even on a large tank.
- the initial water mass is memorized by the microprocessor. Preferably, this microprocessor also regulates temperature and pressure. Equivalently, one can use analog electronics or an ASIC which is an application-specific integrated circuit.
- the pressure-dependent flow rate is practically limited only by the pressure drops of the user device and varies very little according to the conditions of use.
- the steam flow rate of an iron depends little on the way in which the iron is applied to the fabric; the vapor pressure of the tank, for example three bars, is much higher than the pressure necessary to pass through the tissue. This pressure mainly relaxes in the various pipes and orifices of the apparatus.
- the pressure and therefore the flow rate varies a lot with the temperature of the tank.
- the microprocessor delivers a signal representative of the water level.
- the means determine the flow as a function of the temperature of tank.
- the pressure being a saturated vapor pressure, it is directly linked to the tank temperature.
- the calculation of the flow linked to the pressure by a function does not depending on whether constructive arrangements of the device are possible.
- a table of correspondence of the measured vapor flow is established at different temperatures of the tank in the working range. This table is memorized by the electronic device and the instantaneous value of the flow is determined from this table as a function of the instantaneous temperature of the tank.
- the advantage of this calculation is to allow the user acting on a setpoint, large temperature and pressure adjustments amplitude. In this way the user can vary the flow rate of their device, without disturbing the determination of the water level.
- the generator includes a pressure sensor, and the means calculate the flow according to the pressure in the tank.
- a table of flow and pressure correspondence in the useful operating range is stored in the electronic device and the instantaneous value flow is calculated from this table.
- the flow could be corrected based on these instant conditions. Through example, it could be corrected according to the progressive opening of an orifice steam sampling.
- the generator tank is equipped with a heating element which operates at substantially constant and known power. Power variations of heating that we observe following fluctuations in the sector, or an element heating to another in mass production, normally remain in acceptable limits for the desired precision. However, if we wish high precision, it is possible to add known electronic means voltage measurement, or even power consumption, to correct the flow calculated, as a result of these variations.
- the display device displays the level in a relative value at full tank level.
- the indication of the percentage of filling is more readable for the user than the indication of an absolute value.
- the signal representative of the water level can be adapted to control all analog or digital display means, for example a display numeric indicating a value from zero to one hundred. Preferably zero is representative of an empty tank and a hundred of a full tank.
- the signal can be analog and activate a needle galvanometer.
- the full deviation is then obtained for the full tank and zero deviation for a empty tank, or vice versa.
- Pictograms then indicate the meaning of deviation for the full tank.
- the display range is split into several contiguous ranges corresponding to predetermined intervals where the level can be found instantaneous, each track being provided with an indicator.
- the indicator may be a light emitting diode, or an element of a screen with liquid crystals for example.
- the indicators are arranged side by side so as to represent a scale of filling. Each indicator is excited when the level is in the interval predetermined that corresponds to it.
- the indicators and the intervals are arranged to the ladder gradually comes to life or goes out from one end to the other when the level goes from 100% to 0%.
- the number of LEDs can be very large, the level indication will then be almost continuous, or very reduced, for example reduced to four, indicating only if the filling is a quarter of the capacity or half, or at three quarters, or if the filling is complete.
- the generator includes a warning light or an audible warning empty tank, controlled by the empty tank detection means and / or by the system level detection, when the level drops below a threshold predetermined.
- the indicator light then indicates operation on the water reserve, until the steam production.
- the indicator light threshold can be set so that allow the user a few minutes before spraying stops completely. She can then make arrangements to stop her work in the best conditions.
- the invention also covers a method for determining the level of water in a steam generator comprising a tank intended to be filled with water and then heated to produce steam at a pressure higher than the atmospheric pressure, which consists in calculating an initial water level in function of the temperature curve of first heating, to be calculated at each sample produces the mass flow rate of water vapor over time of said withdrawal corresponding to the mass of water withdrawn in the form of steam, to calculate each residual water level.
- Figure 1 is a schematic view of an ironing apparatus comprising a generator according to the invention.
- the generator comprises a cylindrical tank 1 provided with an electric heating element 11, a switch safety thermal, a filling orifice closed by a plug 12 of safety with regard to overpressures, a steam withdrawal orifice provided a solenoid valve 13.
- the solenoid valve 13 is controlled by the device 20 steam user, in this case an iron, fitted with a vaporization 21 capable of causing the solenoid valve 13 to open.
- the circuit 30 also supports power components acting inter alia on the heating element 11.
- a microprocessor 31 receives the information from temperature of the tank 1 provided by a sensor 14 placed on the bottom of said tank 1, and information on the opening or closing status of the solenoid valve 13. The operator can observe a group of four LEDs 32 aligned and lighting up successively for a tank filled to the quarter respectively, at the half, three quarters and up to the capacity.
- a so-called tank light vacuum 33 lights up flashing for a tank filled to within 5% of the maximum. When the tank is completely empty, the usual means of empty tank detection keep the LED 33 permanently on.
- the circuit 30 also supports a command 34 by which the user regulates the flow of its iron, that is to say in reality, the set temperature of the tank 1.
- the microprocessor 31 records the initial temperature given by the sensor 14 and totals the time which elapses. Simultaneously the microprocessor 31 regulates the temperature of the tank 1.
- the power to the heating element is cut off when the sensor 14 indicates a temperature equal to the set temperature, for example 115 ° C, supplied by command 34.
- the microprocessor registers the difference temperature of sensor 14 with the initial temperature and stops counting time. The ratio of the temperature difference to the measured time gives a heating rate which, the power of the heating element being constant and known, makes it possible to determine the mass of water contained by the tank 1.
- this mass is recorded and compared to four thresholds corresponding respectively to a filling substantially equal to 5%, to quarter, half, three quarters of the maximum permissible mass of water in tank 1. If the amount of water is less than 5% of the possible capacity on empty tank light flashes or stays on continuously if there are no more left of water, otherwise if the amount of water is less than a quarter the first indicator is on, otherwise if the amount of water is less than half the second indicator is on, otherwise if the amount of water is less than three quarters the third LED is on, otherwise the fourth LED is on. The user thus has a satisfactory display of the order of magnitude of the filling of its tank.
- the number of thresholds and indicators or indicators can be increased without difficulty to obtain all the precision desired display.
- the microprocessor 31 When the user uses the iron 20 she requests the command 21 to get steam.
- the microprocessor 31 then counts the opening time of the solenoid valve 13, calculates the mass flow as a function of the temperature read by the sensor 14, and calculates the quantity of water withdrawn in the form of vapor. This withdrawn quantity is subtracted from the quantity in memory, which is the initial quantity at the first sample. At the end of each withdrawal the display is updated by comparing the quantity of water memorized, with the thresholds and as previously indicated.
- the first predetermined threshold for example at 5% of the total capacity
- all the lights 32 go off and the empty tank light 33 flashes.
- the user then knows that she does not have a lot of autonomy in water but it can interrupt its work in the better conditions, after having finished ironing the current piece of laundry ironing. The user is not surprised by an untimely cessation of the vaporization which would light the light 33 permanently.
- the indicator 33 is kept on and the element heater 11 is turned off until the user stops completely the device to refill and restart a session of ironing.
- the mass of water recorded in digital form is converted to an analog signal for display.
- a needle galvanometer then indicates the water level to the user. Nevertheless, we compare the value recorded at a minimum threshold so as to control the empty tank indicator like before.
- the initial water mass m 0 is determined by the duration of the heating t between two predetermined temperatures, higher than the ambient temperature and lower than the lowest setpoint that the user can display, for example between 40 ° C and 80 ° C.
- the command 34 acts on the average power of the heating element 11.
- the tank 1 heats up to a predetermined set temperature, then during sampling, the element heater 11 is supplied at a reduced power to correspond to a flow steam below the maximum possible. Pressure and temperature can then fall, but the level determination device taking into account the instant temperature is suitable for providing a correct indication with this type of regulation.
Landscapes
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Textile Engineering (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Sustainable Development (AREA)
- General Engineering & Computer Science (AREA)
- Public Health (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sorption Type Refrigeration Machines (AREA)
- Devices For Medical Bathing And Washing (AREA)
- Control Of Temperature (AREA)
- Irons (AREA)
- Cookers (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
Description
Claims (7)
- Générateur de vapeur comportant une cuve (1) prévue pour être remplie d'eau et pour être ensuite chauffée pour produire une vapeur à une pression supérieure à la pression atmosphérique, un dispositif électronique (30) de détermination et de visualisation du niveau d'eau, caractérisé en ce que le dispositif de détermination du niveau d'eau comprend des moyens pour calculer un niveau d'eau initial en fonction de la courbe de température de premier échauffement, des moyens pour calculer à chaque prélèvement le produit du débit massique de vapeur d'eau par le temps dudit prélèvement correspondant à la masse d'eau prélevée sous forme de vapeur, et des moyens de calcul de chaque niveau d'eau résiduel.
- Générateur de vapeur selon la revendication 1, caractérisé en ce que les moyens calculent le débit en fonction de la température de la cuve (1).
- Générateur de vapeur selon la revendication 1 caractérisé en ce que le générateur comporte un capteur de pression, et les moyens calculent le débit en fonction de la pression dans la cuve (1).
- Générateur de vapeur selon l'une des revendications précédentes caractérisé en ce que le dispositif de visualisation (32,33) affiche le niveau en une valeur relative au niveau de cuve pleine.
- Générateur de vapeur selon l'une des revendications précédentes caractérisé en ce que la plage d'affichage du niveau est scindée en plusieurs plages contiguës correspondant à des intervalles prédéterminés où peut se trouver le niveau instantané, chaque plage étant munie d'un voyant.
- Générateur de vapeur selon l'une des revendications précédentes caractérisé en ce que le générateur comporte un voyant (33) et/ou un avertisseur sonore de cuve vide, piloté par les moyens connus de détection de cuve vide et/ou par le système de détection de niveau qui active ledit voyant (33) ou avertisseur lorsque le niveau descend en dessous d'un seuil prédéterminé.
- Procédé de détermination du niveau d'eau dans un générateur de vapeur comportant une cuve (1) prévue pour être remplie d'eau et ensuite chauffée pour produire une vapeur à une pression supérieure à la pression atmosphérique, caractérisé en ce qu'il consiste à calculer un niveau d'eau initial en fonction de la courbe de température de premier échauffement, à calculer à chaque prélèvement le produit du débit massique de vapeur d'eau par le temps dudit prélèvement correspondant à la masse d'eau prélevée sous forme de vapeur, à calculer chaque niveau d'eau résiduel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0112673 | 2001-10-02 | ||
| FR0112673A FR2830267B1 (fr) | 2001-10-02 | 2001-10-02 | Generateur de vapeur ayant un affichage de niveau d'eau |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1300503A1 true EP1300503A1 (fr) | 2003-04-09 |
| EP1300503B1 EP1300503B1 (fr) | 2007-07-18 |
Family
ID=8867848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02356183A Expired - Lifetime EP1300503B1 (fr) | 2001-10-02 | 2002-09-26 | Générateur de vapeur ayant un affichage de niveau d'eau |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1300503B1 (fr) |
| AT (1) | ATE367470T1 (fr) |
| DE (1) | DE60221210T2 (fr) |
| ES (1) | ES2289068T3 (fr) |
| FR (1) | FR2830267B1 (fr) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1795644A1 (fr) * | 2003-08-13 | 2007-06-13 | Lg Electronics Inc. | Machine à laver à tambour et générateur de vapeur pour celle-ci |
| EP1808524A1 (fr) * | 2006-01-17 | 2007-07-18 | Koninklijke Philips Electronics N.V. | Dispositif et procédé correspondant pour génération de vapeur |
| EP1975308A1 (fr) * | 2007-03-30 | 2008-10-01 | Koninklijke Philips Electronics N.V. | Procédé pour déterminer le niveau de liquide dans une chaudière |
| ES2350210A1 (es) * | 2008-09-22 | 2011-01-20 | Bsh Krainel, S.A | Aparato domestico con una caldera de vapor llenable y caldera de vapor para un aparato domestico. |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2684852A1 (es) | 2017-03-31 | 2018-10-04 | Bsh Electrodomésticos España, S.A. | Aparato de planchado a vapor para detectar la falta de agua. |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE397875C (de) * | 1922-05-22 | 1924-06-27 | Hyman Elias Cohen | Wassererhitzer mit elektrisch beheiztem, schwimmendem Tauchheizkoerper |
| EP0098246A2 (fr) * | 1982-06-18 | 1984-01-11 | Alfredo Cavalli | Générateur de vapeur en particulier pour opérer des fers électriques à repasser à vapeur |
| US5189726A (en) * | 1990-09-28 | 1993-02-23 | Cts Costruzioni Techniche Sanmarinesi | Steam producing apparatus for home use with low cold water reservoir level steam output stoppage |
| EP0772000A1 (fr) * | 1995-10-31 | 1997-05-07 | Seb S.A. | Générateur de vapeur à approvisionnement automatique et procédé de mesure du niveau de liquide dans un tel générateur |
| EP0843039A1 (fr) * | 1996-11-13 | 1998-05-20 | Seb S.A. | Générateur de vapeur |
-
2001
- 2001-10-02 FR FR0112673A patent/FR2830267B1/fr not_active Expired - Fee Related
-
2002
- 2002-09-26 EP EP02356183A patent/EP1300503B1/fr not_active Expired - Lifetime
- 2002-09-26 ES ES02356183T patent/ES2289068T3/es not_active Expired - Lifetime
- 2002-09-26 AT AT02356183T patent/ATE367470T1/de not_active IP Right Cessation
- 2002-09-26 DE DE60221210T patent/DE60221210T2/de not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE397875C (de) * | 1922-05-22 | 1924-06-27 | Hyman Elias Cohen | Wassererhitzer mit elektrisch beheiztem, schwimmendem Tauchheizkoerper |
| EP0098246A2 (fr) * | 1982-06-18 | 1984-01-11 | Alfredo Cavalli | Générateur de vapeur en particulier pour opérer des fers électriques à repasser à vapeur |
| US5189726A (en) * | 1990-09-28 | 1993-02-23 | Cts Costruzioni Techniche Sanmarinesi | Steam producing apparatus for home use with low cold water reservoir level steam output stoppage |
| EP0772000A1 (fr) * | 1995-10-31 | 1997-05-07 | Seb S.A. | Générateur de vapeur à approvisionnement automatique et procédé de mesure du niveau de liquide dans un tel générateur |
| EP0843039A1 (fr) * | 1996-11-13 | 1998-05-20 | Seb S.A. | Générateur de vapeur |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1795644A1 (fr) * | 2003-08-13 | 2007-06-13 | Lg Electronics Inc. | Machine à laver à tambour et générateur de vapeur pour celle-ci |
| US7591154B2 (en) | 2003-08-13 | 2009-09-22 | Lg Electronics Inc. | Drum type washing machine and vapor generator thereof |
| EP1808524A1 (fr) * | 2006-01-17 | 2007-07-18 | Koninklijke Philips Electronics N.V. | Dispositif et procédé correspondant pour génération de vapeur |
| US7997019B2 (en) | 2006-01-17 | 2011-08-16 | Koninklijke Philips Electronics N.V. | Apparatus and method for generating steam |
| EP1975308A1 (fr) * | 2007-03-30 | 2008-10-01 | Koninklijke Philips Electronics N.V. | Procédé pour déterminer le niveau de liquide dans une chaudière |
| WO2008120130A1 (fr) * | 2007-03-30 | 2008-10-09 | Koninklijke Philips Electronics N.V. | Procédé pour la détermination du niveau de liquide dans une chaudière |
| US20100107886A1 (en) * | 2007-03-30 | 2010-05-06 | Koninklijke Philips Electronics N.V. | Method for determining the liquid level in a boiler |
| RU2503762C2 (ru) * | 2007-03-30 | 2014-01-10 | Конинклейке Филипс Электроникс Н.В. | Способ определения уровня жидкости в бойлере |
| KR101465608B1 (ko) * | 2007-03-30 | 2014-11-27 | 코닌클리케 필립스 엔.브이. | 보일러 내의 액체 레벨 결정 방법 |
| US9593975B2 (en) * | 2007-03-30 | 2017-03-14 | Koninklijke Philips N.V. | Method for determining the liquid level in a boiler |
| ES2350210A1 (es) * | 2008-09-22 | 2011-01-20 | Bsh Krainel, S.A | Aparato domestico con una caldera de vapor llenable y caldera de vapor para un aparato domestico. |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1300503B1 (fr) | 2007-07-18 |
| HK1054974A1 (en) | 2003-12-19 |
| FR2830267A1 (fr) | 2003-04-04 |
| DE60221210T2 (de) | 2008-04-10 |
| ES2289068T3 (es) | 2008-02-01 |
| FR2830267B1 (fr) | 2003-12-12 |
| ATE367470T1 (de) | 2007-08-15 |
| DE60221210D1 (de) | 2007-08-30 |
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