EP0795720B1 - Household electrical appliance for steam generation - Google Patents
Household electrical appliance for steam generation Download PDFInfo
- Publication number
- EP0795720B1 EP0795720B1 EP97104150A EP97104150A EP0795720B1 EP 0795720 B1 EP0795720 B1 EP 0795720B1 EP 97104150 A EP97104150 A EP 97104150A EP 97104150 A EP97104150 A EP 97104150A EP 0795720 B1 EP0795720 B1 EP 0795720B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- water
- boiler
- appliance
- pump
- steam generation
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
- F22B1/285—Methods of steam generation characterised by form of heating method in boilers heated electrically with water in reservoirs the water being fed by a pump to the reservoirs
Definitions
- This invention relates to a household electrical appliance for steam generation with automatic water feed controlled electronically by a temperature sensor positioned on the resistance heating element.
- Household electrical appliances are known using steam generation equipment, such as appliances for ironing, or for cleaning floors, windows etc.
- steam generation equipment for domestic use mainly comprises a boiler consisting of a sealed vessel in which an electrical resistance element is located.
- the boiler has an aperture, closed by a cap, through which water is fed into the vessel.
- the electrical resistance element evaporates the water in the vessel until a predetermined boiler pressure is reached.
- the steam formed in the vessel is withdrawn from it via a solenoid valve operated by an external command, and reaches the user device via a hose.
- This user device could be a flat-iron provided with an ironing plate comprising holes through which the steam emerges, or could be a lance, from the end of which the steam leaves for cleaning floors, windows, etc.
- the said type of steam generator has a negative aspect in the lack of practicality of the fact of having to manually pour the water into the boiler.
- the hot cap of the vessel-boiler must be carefully unscrewed, then after the scalding steam which emerges has died down, the vessel is filled with water.
- An object of the present invention is to provide a household electrical appliance for steam generation which allows water to be rapidly fed into the boiler without danger to the operator.
- a further object is to implement said water feed in a gradual manner which prevents thermal shock to the boiler.
- a household electrical appliance for steam generation comprising a boiler into which the water required for steam generation is automatically fed by a micro-pump dipping into a water-containing vessel arranged in U-shape about the boiler, in which manner a resistance heating element can operate on a small water mass and hence achieve particularly fast operation of the appliance, even with the use of low electrical power.
- a boiler 19 is housed within a U-shaped vessel 13 provided with a base 17 extending to also accommodate the plan outline of the boiler.
- Said boiler is provided with a lower hole 12 acting as a seat for fixing to a micro-pump 21. In the opposite position the boiler is provided with another similar lower hole 14 acting as a seat for fixing to a solenoid valve 31.
- the partial section of Figure 3 also shows the particular location of the temperature sensor 10 on top of the typical round structure of the electrical resistance element 15. Said location senses excessive temperature attained by the resistance element 15 when uncovered by reduction in water level, consequent on steam consumption.
- the electric cables 30 of the temperature sensor 10 emerge via a usual gasket 29.
- the electric pump 21 dips into a suitable sump 16, its relationship with the base 17 being shown in Figure 4.
- a cover 26 which enables the intake region to be inspected following its removal, this being achieved by unscrewing a screw 27 which clamps a gasket 37 to seal the sump.
- the sump 16 communicates with the vessel 13.
- a discharge chamber 25 for the electric pump 21, provided between the cover 20 and an edge of the boiler 19. From Figure 4, which illustrates this, it can therefore be seen how the pump 21 transfers water from the vessel 13 to the boiler 19.
- FIG. 5 shows the holes 36 in the cover 20, through which the bolts pass for closing the boiler.
- Figure 6 is a bottom view of the boiler, showing a hole 33 housing the top of the electric pump 21, a hole 34 housing the top of the solenoid valve 31, and holes 18 in the boiler body which match the holes 36 in the cover 20 to allow the required clamping between the parts by usual bolts.
- Figure 7 is a rear view of the boiler 19.
- FIG 9 which is a side view of the boiler 19, shows the region 33 accommodating the electric pump 21, and the terminal part of the electrical resistance element 15.
- Figure 10 shows an extremely economical, high precision electronic circuit.
- the reference numeral 10 indicates the sensor positioned on the top of the resistance element ; 41 indicates the electrical change-over switch of the water level measurement circuit and is inserted in the vessel 13; 42 is a trimmer for presetting the circuit; 44 is an operational circuit for controlling the temperature of the electrical resistance element 15 with the aid of the sensor 10; 45 is an operational circuit for controlling the water level 22 with the aid of the sensor 10 positioned on the top of the electrical resistance element 15; 15 is said electrical resistance element for the boiler 19; and 21 is the electric pump.
- the sensor is of the variable electrical resistance NTC type, and performs two functions: the first is to control the water temperature in the boiler, and the second to control the water level in the boiler. This water level control is indirect.
Abstract
Description
- This invention relates to a household electrical appliance for steam generation with automatic water feed controlled electronically by a temperature sensor positioned on the resistance heating element.
- Household electrical appliances are known using steam generation equipment, such as appliances for ironing, or for cleaning floors, windows etc.
- Such an electrical appliance is described in WO 89 03496 A.
- Normally, steam generation equipment for domestic use mainly comprises a boiler consisting of a sealed vessel in which an electrical resistance element is located. The boiler has an aperture, closed by a cap, through which water is fed into the vessel. The electrical resistance element evaporates the water in the vessel until a predetermined boiler pressure is reached. The steam formed in the vessel is withdrawn from it via a solenoid valve operated by an external command, and reaches the user device via a hose. This user device could be a flat-iron provided with an ironing plate comprising holes through which the steam emerges, or could be a lance, from the end of which the steam leaves for cleaning floors, windows, etc.
- The said type of steam generator has a negative aspect in the lack of practicality of the fact of having to manually pour the water into the boiler. In particular, if filling is necessary during use, the hot cap of the vessel-boiler must be carefully unscrewed, then after the scalding steam which emerges has died down, the vessel is filled with water.
- Although these precautions enable scalding by hand contact with steam or boiling water splashes to be avoided, the said feeding of cold water into a very hot vessel creates thermal shock to the boiler structure, so prejudicing its soundness with time.
- It is therefore clear that current systems for directly filling the boiler manually are neither of maximum safety nor rapid in their implementation.
- An object of the present invention is to provide a household electrical appliance for steam generation which allows water to be rapidly fed into the boiler without danger to the operator. A further object is to implement said water feed in a gradual manner which prevents thermal shock to the boiler.
- These and further objects will be seen to have been attained by a household electrical appliance for steam generation, comprising a boiler into which the water required for steam generation is automatically fed by a micro-pump dipping into a water-containing vessel arranged in U-shape about the boiler, in which manner a resistance heating element can operate on a small water mass and hence achieve particularly fast operation of the appliance, even with the use of low electrical power.
- The invention is illustrated by way of non-limiting example on the accompanying drawings, in which Figures 1, 2 and 3 are three conventional views, of which:
- Figure 1 is a top view of the appliance without the boiler and vessel covers;
- Figure 2 is a front view of the appliance complete with cover, pump and solenoid valve;
- Figure 3 is a lateral section through the appliance on the line ZZ, this section specifically showing the sensor on the top of the electrical resistance element, the water levels present in the boiler and vessel, and the manner in which the electric pump draws water from the well of the vessel to feed it to the boiler;
- Figure 4 shows the drawing sump used by the pump to draw water from the vessel, the sectional walls being particularly evident;
- Figures 5, 6, 7, 8, 9 show the boiler in the standard views indicated;
- Figure 10 shows an electronic circuit suitable for controlling the appliance functions.
-
- With reference to said Figure 1, a
boiler 19 is housed within a U-shapedvessel 13 provided with abase 17 extending to also accommodate the plan outline of the boiler. - Within the
boiler 19 there is provided an electricalresistance heating element 15 and atemperature sensor 10 for measuring the external temperature of saidresistance element 15. - Said boiler is provided with a
lower hole 12 acting as a seat for fixing to amicro-pump 21. In the opposite position the boiler is provided with another similarlower hole 14 acting as a seat for fixing to asolenoid valve 31. - Along the
edges 19A of the boiler there are providedholes 18 to matchholes 36 in aclosure cover 20 for the two parts, which is clamped by usual bolts. - The tops of the holes housing said
pump 21 and saidsolenoid valve 31 are also covered in this manner, thee latter having their bodies external to the boiler, as indicated by Figure 2. This figure shows the position of ahole 32 for steam exit from saidsolenoid valve 31. - In addition to the
boiler 19 and theelectrical resistance element 15, the partial section of Figure 3 also shows the particular location of thetemperature sensor 10 on top of the typical round structure of theelectrical resistance element 15. Said location senses excessive temperature attained by theresistance element 15 when uncovered by reduction in water level, consequent on steam consumption. Theelectric cables 30 of thetemperature sensor 10 emerge via ausual gasket 29. - The
electric pump 21 dips into asuitable sump 16, its relationship with thebase 17 being shown in Figure 4. - From Figure 3 it can be shown that the water within the
boiler 19 has alevel 22, whereas the water external to the boiler, ie in thevessel 13, has adifferent level 23, hence demonstrating their mutual independence. - In the
sump region 16 there is acover 26 which enables the intake region to be inspected following its removal, this being achieved by unscrewing ascrew 27 which clamps agasket 37 to seal the sump. - The
sump 16 communicates with thevessel 13. At the top of thepump 21 there is adischarge chamber 25 for theelectric pump 21, provided between thecover 20 and an edge of theboiler 19. From Figure 4, which illustrates this, it can therefore be seen how thepump 21 transfers water from thevessel 13 to theboiler 19. - Figure 5 shows the
holes 36 in thecover 20, through which the bolts pass for closing the boiler. - Figure 6 is a bottom view of the boiler, showing a
hole 33 housing the top of theelectric pump 21, ahole 34 housing the top of thesolenoid valve 31, andholes 18 in the boiler body which match theholes 36 in thecover 20 to allow the required clamping between the parts by usual bolts. - In Figure 8, of the
electrical resistance element 15 there can be seen, in the form of circles, twotypical terminals 35 which emerge from theboiler 19 via usual water and steam seals. - Figure 7 is a rear view of the
boiler 19. - From Figure 8, which is a front view of the
boiler 19, there can be seen aregion 33 in which theelectric pump 21 is located, and aregion 34 in which thesolenoid valve 31 is located. - Figure 9, which is a side view of the
boiler 19, shows theregion 33 accommodating theelectric pump 21, and the terminal part of theelectrical resistance element 15. - Figure 10 shows an extremely economical, high precision electronic circuit. In this, the
reference numeral 10 indicates the sensor positioned on the top of the resistance element ; 41 indicates the electrical change-over switch of the water level measurement circuit and is inserted in thevessel 13; 42 is a trimmer for presetting the circuit; 44 is an operational circuit for controlling the temperature of theelectrical resistance element 15 with the aid of thesensor 10; 45 is an operational circuit for controlling thewater level 22 with the aid of thesensor 10 positioned on the top of theelectrical resistance element 15; 15 is said electrical resistance element for theboiler 19; and 21 is the electric pump. The sensor is of the variable electrical resistance NTC type, and performs two functions: the first is to control the water temperature in the boiler, and the second to control the water level in the boiler. This water level control is indirect. It derives from the fact that an electricalheating resistance element 15 immersed in water never exceeds the temperature of the water mass surrounding it, and the fact that, as soon as the water level falls to uncover a part of saidelectrical resistance element 15, this uncovered part rapidly increases in temperature. Consequently, by utilizing this phenomenon, this arrangement has been conceived by which not only is the water level restored as it becomes depleted during the use of the appliance, but the resistance element is prevented from remaining completely uncovered and attaining high temperature, so preventing it undergoing thermal shock. Because of said level control theboiler 19 is never without water, and therefore results in greater appliance reliability.
Claims (5)
- A household electrical appliance for steam generation, comprising a boiler (19) into which the water required for steam generation is automatically fed by a micro-pump (21) dipping into a water-containing vessel (13) arranged in U-shape about the boiler, in which manner a resistance heating element (15) can operate on a small water mass and hence achieve particularly fast operation of the appliance, even with the use of low electrical power.
- A household electrical appliance as claimed in the preceding claim, characterised in that the operation of the micro-pump (21) in transferring water from the vessel (13) to the boiler (19) is controlled by a temperature sensor (10) arranged to sense the large difference in the temperature of said electrical resistance element (15) between the condition in which it is completely immersed in water and the condition in which it emerges from the water following the consumption of this latter during use.
- An appliance as claimed in the preceding claims, characterised in that the micro-pump (21) is located external to the boiler (19), water intake occurring by the use of a sump (16) into which the micro-pump (21) dips in and which can be inspected (26) from below.
- An appliance as claimed in the claims 2 to 3, characterised by using to determine the necessary water level an NTC sensor, ie an electrical resistor which varies with varying temperature.
- An appliance as claimed in the claims 2 to 4, characterised by an electronic circuit which enables the electrical resistance element (15) to be de-activated when the sensor (10) senses the absence of water in the boiler.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITCO960009U | 1996-03-13 | ||
IT1996CO000009U IT242274Y1 (en) | 1996-03-13 | 1996-03-13 | APPLIANCE FOR STEAM GENERATION WITH AUTOMATIC WATER SUPPLY WITH ELECTRONIC CONTROL |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0795720A1 EP0795720A1 (en) | 1997-09-17 |
EP0795720B1 true EP0795720B1 (en) | 2001-02-14 |
Family
ID=11347901
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97104150A Expired - Lifetime EP0795720B1 (en) | 1996-03-13 | 1997-03-12 | Household electrical appliance for steam generation |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP0795720B1 (en) |
AT (1) | ATE199179T1 (en) |
DE (1) | DE69704063T2 (en) |
ES (1) | ES2156314T3 (en) |
GR (1) | GR3035732T3 (en) |
IT (1) | IT242274Y1 (en) |
PT (1) | PT795720E (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1297843B1 (en) * | 1997-05-06 | 1999-12-20 | Imetec Spa | DOMESTIC STABILIZED BOILER WATER LEVEL ELECTRIC GENERATOR, ESPECIALLY FOR IRONS. |
AU2000238354A1 (en) * | 2000-03-30 | 2001-10-15 | Imetec S.P.A. | Household steam generator apparatus |
US20030142965A1 (en) * | 2002-01-29 | 2003-07-31 | Kable Enterprises Co., Ltd. | Steam-cleaning appliance |
EP1555480A1 (en) * | 2003-12-31 | 2005-07-20 | Electrodomesticos Taurus S.L. | Pressurized steam generator |
EP2287390A1 (en) * | 2009-08-18 | 2011-02-23 | BSH Bosch und Siemens Hausgeräte GmbH | Method of operating a steam generator of a laundry appliance, and laundry appliance for performing the method |
CN103307687B (en) * | 2013-07-09 | 2016-08-17 | 温州大学 | Based on the electrical heating type air-humidification method and the electrical heating type humidifier that tilt U-rail |
CN112921615B (en) * | 2021-01-23 | 2023-02-03 | 浙江蓝蒂服饰股份有限公司 | Steam ironing machine |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2880300A (en) * | 1953-02-06 | 1959-03-31 | Reimers Electric Appliance Co | Electrically-heated steam generators |
DD241941B1 (en) * | 1985-10-21 | 1989-04-26 | Berlin Oberbekleidung | SAFETY DEVICE FOR A TRANSPORTABLE SMALL STEAM GENERATOR |
DE3720583A1 (en) * | 1987-06-22 | 1989-01-05 | Riba Guenther | Steam generator with blow-down device |
EP0333728B1 (en) * | 1987-10-09 | 1991-01-23 | Termozeta Elettrodomestici S.P.A. | Utility steam generator with self-controlled pressure more particularly for little household electric appliances |
DE4304532A1 (en) * | 1993-02-16 | 1994-08-18 | Planeta Hausgeraete | Method and device for controlling the water supply to a steam generator |
EP0638767A1 (en) * | 1993-05-20 | 1995-02-15 | Satiber, S.L. | Improvement of steam generators for household use |
-
1996
- 1996-03-13 IT IT1996CO000009U patent/IT242274Y1/en active
-
1997
- 1997-03-12 AT AT97104150T patent/ATE199179T1/en not_active IP Right Cessation
- 1997-03-12 EP EP97104150A patent/EP0795720B1/en not_active Expired - Lifetime
- 1997-03-12 PT PT97104150T patent/PT795720E/en unknown
- 1997-03-12 ES ES97104150T patent/ES2156314T3/en not_active Expired - Lifetime
- 1997-03-12 DE DE69704063T patent/DE69704063T2/en not_active Expired - Lifetime
-
2001
- 2001-04-06 GR GR20010400585T patent/GR3035732T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
ES2156314T3 (en) | 2001-06-16 |
ATE199179T1 (en) | 2001-02-15 |
PT795720E (en) | 2001-06-29 |
DE69704063T2 (en) | 2001-06-13 |
IT242274Y1 (en) | 2001-06-04 |
ITCO960009V0 (en) | 1996-03-13 |
GR3035732T3 (en) | 2001-07-31 |
EP0795720A1 (en) | 1997-09-17 |
ITCO960009U1 (en) | 1997-09-13 |
DE69704063D1 (en) | 2001-03-22 |
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