CN102124265A - Device and method for generating steam, and heating element for use in such a device - Google Patents
Device and method for generating steam, and heating element for use in such a device Download PDFInfo
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- CN102124265A CN102124265A CN2009801318875A CN200980131887A CN102124265A CN 102124265 A CN102124265 A CN 102124265A CN 2009801318875 A CN2009801318875 A CN 2009801318875A CN 200980131887 A CN200980131887 A CN 200980131887A CN 102124265 A CN102124265 A CN 102124265A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
- H05B3/28—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor embedded in insulating material
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/78—Adaptations or mounting of level indicators
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
- H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
- H05B3/26—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/013—Heaters using resistive films or coatings
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/017—Manufacturing methods or apparatus for heaters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
- H05B2203/021—Heaters specially adapted for heating liquids
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Abstract
The invention relates to a device for generating steam comprising a heating element for evaporating water. The invention also relates to a heating element for use in a device according to the invention. The invention further relates to a method for generating steam by means of a device according to the invention.
Description
Technical field
The present invention relates to be used to produce the device of steam.The invention still further relates to the heating element heater that is used in according in the device of the present invention.The invention further relates to the method that is used for producing steam by device according to the present invention.
Background technology
In conventional steam baker, steam generator is positioned at the bottom in steam baker chamber.This steam generator comprises that be used to keep will be by the vapor vessel of the water of the heat of vaporization that produces in the baker.Sheathed heating element heater be positioned at vapor vessel below.At run duration, heat is passed to vapor vessel, and is passed to the water that will evaporate from steam subsequently.Water is supplied with and is controlled by using so-called birds drinking water dispenser principle, and this distributor generally includes inverted bottle, and it has the distribution openings of extending from lowest part.Gravity traction waterborne produces parital vacuum at the upper area of this bottle, and it prevents to flow out without restriction by this distribution openings.The typical problem of this known steam generator is formed in the lime scale in the vapor vessel and the cleaning of this steam generator.And another problem of this known steam generator is, has been found that it is difficult to guarantee that the dosage of steam crucible and continuous water supplies with.In the too low situation of water level in the steam crucible, then heating element heater will become dry easily, and this will damage steam generator, and can produce the situation of relative risk.On the other hand, in the too high situation of the water level in the steam crucible, the time that becomes steam will become greatly unfriendly, and this can postpone the digestion process in the steam baker considerably.
Summary of the invention
Target of the present invention provides a kind of improved device that is used to produce steam, and it can relatively accurately be controlled.
Therefore, the invention provides a kind of device according to preface, comprising: at least one vapor vessel is used to collect the water that will evaporate; At least one heating element heater is used to evaporate the water that is comprised by described vapor vessel; At least one feed-water valve is used for water is provided to described vapor vessel; Checkout gear is used to detect the water level in the vapor vessel; With the control module that is connected to described feed-water valve and described checkout gear, described control module is set to open described feed-water valve when dropping to the actual water level that is lower than the predetermined critical lowest water level being detected by described checkout gear, fills vapor vessel with water (again).By detect the actual water level in the vapor vessel directly or indirectly by checkout gear, and dropped in the situation that is lower than the predetermined critical water level by refilling vapor vessel at detected actual water level, can control to according to the water of the vapor vessel in the device of the present invention with relative accurate way and supply with, consequently can prevent the drying operation (running dry) of heating element heater.Feed-water valve can be thought conventional valve or pump.In this article, opening of feed-water valve means the startup feed-water valve, to allow the water process.Preferably, control module also is arranged on according to the volume and the structure of discharge, vapor vessel and closes (stopping using) feed-water valve after certain hour length.Replacedly, control module can be set to, and closes feed-water valve when the actual water level in detecting vapor vessel reaches the predetermined critical maximum stage.By this way, the water level in the vapor vessel can relatively accurately remain between critical lowest water level and the critical maximum stage, prevents the dry operation of heating element heater on the one hand, guarantees the gratifying steam time that becomes on the other hand.
Can realize the detection of the actual water level in the vapor vessel in many ways, what wherein can expect is for example to adopt the water level of measuring between the floating element in the vapor vessel.Yet in this boiling environment, this direct, preferred accurate detection will be difficult to realize usually.Therefore, by preferably, measure actual water level direct or indirect relevant other procedure parameter interior, as hereinafter will illustrating with vapor vessel.
In preferred embodiment, checkout gear is set to detect the drying operation of at least a portion of described heating element heater, and wherein control module is set to open feed-water valve when the drying operation of at least a portion that is detected described heating element heater by described checkout gear.The detection of the drying operation of heating element heater will be directly related with the water level in the vapor vessel.For example can be by detecting the actual temperature and/or the dry ruuning situation of resistance detection (approaching) of heating element heater.When checkout gear detects the temperature of heating element heater and/or resistance and surpasses the predetermined critical threshold value, think the dry ruuning situation that detects heating element heater, consequently, control module will be opened feed-water valve, to refill vapor vessel at least in part.
Vapor vessel can be formed by its conventional vapor vessel that can locate independent heating element heater down, wherein the heat that is produced by heating element heater can be passed to vapor vessel, and wherein the heat that is absorbed by vapor vessel can transmit the water that is comprised by vapor vessel, produces steam thus.Yet in order to increase the thermal efficiency according to device of the present invention, vapor vessel is preferably limited by heating element heater at least in part.By heating element heater is integrated with vapor vessel at least in part, then can be directly rather than the indirect water that will evaporate by heating element heater, from the energy viewpoint, this is favourable.Usually, heating element heater forms the bottom side of vapor vessel, one or more sidewalls of vapor vessel wherein, and preferred truncated cone shape sidewall can be connected to heating element heater in medium mode closely roughly.In this article, will be clear that the vapor vessel of various structures and design is imaginabale for a person skilled in the art.In particularly preferred embodiments, the general planar end face of heating element heater limits the bottom of vapor vessel at least in part.The general planar end face that adopts heating element heater is with the favourable controlled and accurate detection of carrying out the water level in the vapor vessel.More preferably, the end face approximate horizontal orientation of heating element heater.This means that the water level on each part of end face of heating element heater is identical.Yet the shortcoming of this horizontal orientation of the end face of the qualification vapor vessel of heating element heater is that whole heating element heater will with trigger control unit, therefore trigger feed-water valve by dry operation for several times at run duration.In this embodiment, the operation of the drying of heating element heater will be more common than test, and this may influence the life expectancy of heating element heater.Therefore, in some cases, can be preferred in respect to the situation of horizontal line inclined orientation at the end face of heating element heater.The angle of inclination is preferably between 2 ° and 30 °.By place the general planar end face of heating element heater with certain angle, the partial bus of the at first dry operation of the end face of heating element heater is defined.Therefore,, can optimize the design of heating element heater, with the life expectancy of stress in the restriction heating element heater and prolongation heating element heater, the therefore life expectancy that prolongs this steam generation device for this a kind of application in back.
Heating element heater according to device of the present invention can be multiple kind, and for example can be formed by sheathed (tubulose) heating element heater.Yet, preferably, heating element heater according to device of the present invention is formed by thick-film heating element, and this thick-film heating element comprises the thermal-conductivity substrate that is used to heat, be arranged on described suprabasil at least one first dielectric layer and be arranged at least one conductive heater track on described first dielectric layer.Usually, described substrate is formed by stainless steel or ceramic wafer, applies first dielectric layer and resistance paste on it continuously.Each layer is usually by the serigraphy coating, and wherein each layer is dried and roasting subsequently.Thick film element is preferably in other routine (tubulose) heating element heater top, because thick film has low relatively (heat) quality, and little heat storage capacity, fast reaction, and heat can be propagated and is sent to the water that will evaporate equably.The different preferred implementations that presented thick film heater hereinafter.
In preferred embodiment, checkout gear is integrated with heating element heater at least in part, wherein checkout gear comprises: at least one conductive sensor track, be arranged on described first dielectric layer with a certain distance from described heating track, with at least one second dielectric layer, be arranged on described first dielectric layer, described second dielectric layer is connected at least a portion of described heating track and at least a portion of described sensor track.Preferably, the sensor track is enclosed between two dielectric layers.More preferably, under temperature much at one, the resistance of first dielectric layer is higher than the resistance of second dielectric layer.In the temperature of heating element heater will the situation above predetermined critical, leakage current will be via second dielectric layer from heating track flow direction sensor track.By this leakage current of sensing, for example by the sensor track is connected to ammeter or voltmeter, can detect the heating of crossing of heating element heater in responsive and reliable relatively mode, therefore detect dry ruuning situation, consequently can open feed-water valve by control module.The heating track can be positioned between first dielectric layer and second dielectric layer, with respect to sensor trajectory generation or the more few parallel arrangement.Replacedly, at least one heating track is positioned at the side of second dielectric layer away from first dielectric layer, and this is favourable in the situation that the sensor track for example can be formed by the sensor grid.Disclosed in more detail preferred embodiment in International Application No. WO 2006/083162 and unexposed International Application PCT/NL2008/050360, the full content with these two international applications is incorporated into this by reference, is used for whole purposes.
In another preferred embodiment, heating element heater also comprises the temperature barrier that covers at least one heating orbit segment, described temperature barrier be suitable for predetermined increase temperature with the heating track make described at least one be capped the heating orbit segment and produce short circuit, increase thus described at least one be capped the heating orbit segment temperature, make described at least one be capped the heating orbit segment with destroyed, described heating track is irreversibly interrupted.Because this short circuit heat, protector and the heating orbit segment that therefore is capped will reach a high temperature, and make the heating orbit segment that is capped to melt and/or to evaporate, and will be therefore destroyed.Preferably, control module also is connected to heating element heater, to guarantee that by prophylactically cut off heating element heater at the predetermined critical temperature place described element does not reach overtemperature.
In particularly preferred embodiments, heating element heater comprises: the first heating track with low relatively power density, the described first heating track is arranged on the higher part of vapor vessel, with the second heating track with relative high power density, the described second heating track is arranged on the lower part of vapor vessel.The first heating track and the second heating track can be connected to each other.Yet, can also conceivablely be that these two tracks are circuit separately.Already mentioned as mentioned like that, this specified arrangement of heating track for example is to be favourable in the situation of inclined orientation at heating element heater.For the drying that detects heating element heater is moved, and particularly detect being moved by first drying that heats the part of track heating of substrate, checkout gear preferably is connected to the part that comprises the first heating track of heating element heater at least.Replacedly, the resistance variations of low power density track can be used for detecting dry operation.Replacedly, the drying of the low power density track of independent temperature-sensing device (for example, bimetallic devices, NTC, PTC, thermocouple) the sensing heating element heater of can exerting oneself operation.Yet this specific layout not only is applicable to the inclination heating element heater.What also can expect is, the second heating track (high power density) is arranged on the bottom side of vapor vessel, and the first heating track (low power density) is arranged on the opposite side of vapor vessel, as sidewall.
Such as already mentioned, the water level that directly detects in the vapor vessel by the mechanical device such as float is not preferred.This boiling environment is incited somebody to action too fierce usually and can not be detected actual water level reliably.Except being used to of above presenting realized the accurate relatively preferred implementation that detects to the actual water level in the vapor vessel, device replacedly comprises the cold water vessels that is used to collect the water that will be delivered to vapor vessel.By with cold water vessels and vapor vessel as connection container, and, can determine the actual water level in the vapor vessel by detecting the water level in the cold water vessels.The measurement that can set up the water level in the cold water vessels by all known checkout gears, float for example mentioned above, resistance or capacitance measurement, thermal measurement.Water receptacle can also integrate with vapor vessel, and wherein the cistern of cold water vessels and vapor vessel for example is spaced from each other by partition.Drop in the situation that is lower than the predetermined critical lowest water level detecting actual water level, control module will be opened feed-water valve, and refilling cold water vessels, the result refills vapor vessel like that according to expectation.
A kind of replaceable mode that is used to detect the water yield that is comprised by vapor vessel is the water yield that is comprised by vapor vessel by weighting, based on the water yield of this weighting, and the actual amount of water in can the calculation of steam container, the water level in therefore can the calculation of steam container.
Feed-water valve will be set to be connected to water system, particularly water-main usually.Water system is replacedly formed by the supply container that constitutes according to the part of device of the present invention, wherein can be manually or refill this supply container automatically.Water to the supply of vapor vessel replacedly-and finally additionally-based on the recirculation of (condensation) steam.
In the situation that feed-water valve is formed by pump, the pump discharge of this pump, promptly the water volume units of time per unit is preferably adjustable.Can advantageously regulate pump discharge, satisfying water supply requirement in simple relatively mode.More preferably, control module is suitable for basis and regulates pump discharge by the relevant water level of checkout gear acquired information.By regulating the flow of pump, the water that can easily be optimized to vapor vessel is supplied with.
In another preferred embodiment, this device also comprises the post-heater that was set to heat from the steam of vapor vessel reception.Superheated steam is particularly suitable for culinary art, because superheated steam conducts to heat the food of will be cooked fast.When steam is crossed heating, the condensation product on the food seldom so that this embodiment go for ' drier oil fries in shallow oil ', wherein under without grease or oil condition with the rapid cooking food of high temperature, therefore provide interchangeable healthy the selection for fried food.Superheated steam also is specially adapted to sterilization, degreasing and cleaning and uses.The described post-heater that is used to produce superheated steam is preferably formed by flow-through heater, to convert steam to superheated steam effectively.Flow-through heater preferably includes elongated heating flow path, more preferably spirality.Described flow path randomly comprises one or more deflection plates.Flow-through heater preferably includes and heats the heating element heater of flow path thermo-contact, and wherein said heating element heater is thick-film heating element more preferably.In International Application No. WO 2007/037694, disclosed in more detail preferred embodiment, by reference the full content of this international application has been incorporated into this, be used for all purposes at this.
The invention still further relates to the heating element heater that is used in according in the device of the present invention, be characterised in that this heating element heater comprises: have the first heating track of low relatively power density, with the second heating track with relative high power density.At advantage and other embodiment that this specific heating element heater above has been described in the mode of complete understanding.
The invention still further relates to the electrical equipment that is set to according to heating element heater of the present invention.Can be according to the electrical equipment of embodiment of the present invention with providing steam as major function, as steam cleaner, or as miscellaneous function, as be used to prepare the heating up milk bubbler of cappuccino.Electrical equipment can also have by identical outlet or by the different outlet distribution hot water or the option of steam.Can comprise wallpaper stripper, vapour iron, water filter, food vapors pot, dish-washing machine, floor cleaning equipment in conjunction with other electrical equipment of the embodiment of distributing steam or other gas, carpet, curtain or furniture cleaner, and be used for the sterilizing equipment decontaminating apparatus that medical treatment, dentistry or food sterilization are used.This electrical equipment can be of portable form, and perhaps forms the part of family expenses, industry, commercialization or laboratory processing unit.
The invention still further relates to by produce the method for steam according to the device of invention, comprise the steps: A) adopt the water that will evaporate to fill vapor vessel, B) start heating element heater, evaporate at least a portion water that comprises by vapor vessel at first thus, C) by the water level in the checkout gear detection vapor vessel, and D) opens feed-water valve when dropping to the actual water level that is lower than the predetermined critical water level detecting, to refill vapor vessel.More preferably, at step C) during, dry ruuning situation or approaching dry ruuning situation appear at least a portion of described heating element heater, and at step D) during, when appearring at least a portion that detects described heating element heater, dry ruuning situation opens feed-water valve.Replacedly, at step C) during, be derived from the leakage current sensed water level of at least one heating track of heating element heater by measurement.Replacedly, at step C) during, the temperature and/or the resistance variations sensed water level of at least one the heating track by measuring heating element heater.Also can conceivablely be, at step C) during, by measure with cold water vessels that vapor vessel is communicated with in the water level detecting water level.In preferred embodiment, this method also comprises step e), step e) comprise that the steam guiding that will produce at vapor vessel is by being used to produce the post-heater of superheated steam.This method preferably also comprises step F), step F) be included in when detecting the actual water level that surpasses predetermined critical maximum stage, close feed-water valve, to stop refilling of vapor vessel.
Description of drawings
Will be according to the present invention being described in the non-limiting illustrative embodiments shown in the ensuing accompanying drawing.Here:
Fig. 1 shows the section according to first embodiment of the device that is used to produce steam of the present invention;
Fig. 2 shows the section according to second embodiment of the device that is used to produce steam of the present invention;
Fig. 3 shows the section according to the 3rd embodiment of the device that is used to produce steam of the present invention;
Fig. 4 shows the section according to the 4th embodiment of the device that is used to produce steam of the present invention;
Fig. 5 shows the section according to the 5th embodiment of the device that is used to produce steam of the present invention;
Fig. 6 shows the section according to the 6th embodiment of the device that is used to produce steam of the present invention;
Fig. 7 shows the perspective view according to steam baker of the present invention; And
Fig. 8 shows the schematic diagram of the equipment that produces according to superheated steam of the present invention.
The specific embodiment
Fig. 1 shows the section according to first embodiment of the device 1 that is used to produce steam of the present invention.Device 1 comprises the vapor vessel 2 of partly being filled by the water 3 that will evaporate.The bottom side of vapor vessel 2 is limited by thick-film heating element 4, and this heating element heater 4 comprises metal or ceramic bases 5, be arranged on first dielectric layer 6 in the described substrate 5, be arranged on sensor track 7 on the described dielectric layer 6, be arranged on second dielectric layer 8 on described first dielectric layer 6 and the described sensor track 7 and be arranged on heating track 9 on described second dielectric layer 8.Device 1 also comprises control module 10, and heating track 9 and sensor track 7 are connected to control module 10.Ammeter 11 is used for measuring the leakage current by sensor track 7.Control module 10 is connected to the pump 12 that is set to refill vapor vessel 2.In the dry ruuning situation of heating element heater 4, the temperature of heating element heater is with fast rise, and causing particularly, the resistance of second dielectric layer 8 descends.Therefore, leakage current will be via second dielectric layer 8 from heating track 9 flow direction sensor tracks 7.Detected by ammeter 11 in the situation of leakage flow, the flow of pump 12 will be opened and preferably be adjusted to control module 10, to refill vapor vessel, the dry ruuning situation of balance heating element heater 4.In device 1 replaceable embodiment, heating track 9 can be positioned between first dielectric layer 6 and second dielectric layer 8 with a certain distance from sensor track 7, wherein heats track 9 and sensor track 7 preferably has the layout of almost parallel.
Fig. 2 shows the section according to second embodiment of the device 13 that is used to produce steam of the present invention.The vapor vessel 14 that device 13 is partly filled by the water 15 that will evaporate.The tilting bottom of vapor vessel 14 is by (inclination) thick-film heating element 16, and heating element heater 16 comprises thermal-conductivity substrate 17, be arranged on dielectric layer 18 in the described substrate 17, be arranged on the first heating track 19 with low relatively power density in the described dielectric layer 18 high portions and be arranged on the second heating track 20 with low relatively power density on described dielectric layer 18 lower curtates.The first heating track 19 is connected to the detecting element 21 of the dry running status of this higher part that is used to detect heating element heater 16.Detecting element 21 can be for various kinds, and wherein detecting element 21 for example can be suitable for detecting the temperature or the changes in resistance of the first heating track 19.In this embodiment, such sensor layer (not shown) that applies that can be as shown in fig. 1 is to detect dry ruuning situation.The first heating track 19 has a mind to be set to have low power density, because the heating element heater 16 this parts of raising will replace between dry running status and dampness.The low power density layout of the first heating track 19 prevents to keep gratifying life expectancy thus at the heating element heater 16 this material stresses that produce essence in the part of raising.And the heating track 19 of low power density is not so good as heating track 20 danger of high power density usually basically.The first heating track 19 is connected to the detecting element 21 of raising dry ruuning situation partly that is used to detect heating element heater 16.The control module 22 that is connected to described detecting element 21 is suitable for occurring starting pump 23 in the dry situation about moving at least a portion of heating element heater 16.Water supply container 24 is connected to pump 23, so that can refill vapor vessel 14.The second heating track 20 can also be connected to the second detecting element (not shown) alternatively, and second detecting element will provide additional safety measure when detecting element 21 can not correctly move.Illustrating in the state of device 13, control module 22 has just started pump 23, to refill vapor vessel 14.
Fig. 3 shows the section according to the 3rd embodiment of the device 25 that is used to produce steam of the present invention.Device 25 comprises the vapor vessel 26 of partly being filled by the water 27 that will evaporate.The base section ground of vapor vessel 26 is formed by first thick-film heating element 28.The central bottom 29 of vapor vessel 26 is raised with respect to the first adjacent thick-film heating element 28, and wherein the bottom of raising 29 of vapor vessel 26 is provided with second thick-film heating element 30 with low power density.First heating element heater 28 comprises substrate 31, be arranged on the medium enamel layer 32 in the described substrate 31 and be arranged at least one heating track 33 on the described enamel layer 32, and described heating track 33 has high relatively power density.The dry running status of second heating element heater 30 can be detected by the detecting element 34 that is connected to described second heating element heater 30.Based on the information that is obtained by detecting element 34, control module 35 can start the valve 36 of the water pipe 37 that is connected to water-main, refills vapor vessel 26 customizing, and prevents that dry running status from appearring in first heating element heater 28.
Fig. 4 shows the section according to the 4th embodiment of the device 38 that is used to produce steam of the present invention.Device 38 shown in Fig. 4 is similar to the device 25 shown in Fig. 3 more or less textural.Device 38 according to Fig. 4 comprises the vapor vessel 39 of partly being filled by the water 40 that will evaporate, and is also referred to as steam crucible or vaporium.The bottom of vapor vessel 39 is formed by first thick-film heating element 41.The sidewall 42 of vapor vessel 39 is provided with second heating element heater 43 of the lifting with low power density.First heating element heater 41 comprises substrate 44, be arranged on the medium enamel layer 45 in the described substrate 44 and be arranged at least one heating track 46 on the described enamel layer 45, and described heating track 46 has high relatively power density.The dry running status of second heating element heater 43, and the steam that is therefore produced by this device 38 can be detected by the detecting element 47 that is connected to described second heating element heater 43.Based on being detected by detecting element 47 and providing to the information of control module 48, control module 48 can start the valve 49 of the water pipe 50 that is connected to water supply container 51, can regularly refill vapor vessel 39, prevents that dry running status from appearring in first heating element heater 41.Randomly, refill water supply container 51 by condensed steam recirculation (not shown in this Figure).
Fig. 5 shows the section according to the 5th embodiment of the device 52 that is used to produce steam of the present invention.Device 52 comprises the vapor vessel 53 of partly being filled by water 54, and described vapor vessel 53 comprises truncated cone shape sidewall 55 roughly and the bottom that is formed by thick-film heating element 56.Heating element heater 56 is similar to first heating element heater 41 shown in Fig. 4 substantially textural.Device 52 also comprises the cold water vessels 57 that is communicated with vapor vessel 53 via the tube connector 58 that passes heating element heater 56.Cold water vessels 57 is provided with the optical pickocff 59 that is used to detect the actual water level in the cold water vessels 57.Optical pickocff 59 is connected to control module 60, with the information of processing by optical pickocff 59 acquisitions, and starts pump 61, is used to refill cold water vessels 57, and therefore refills vapor vessel 53.Because the actual water level in the cold water vessels 57 directly is associated with actual water level in the vapor vessel 53, then can be by the actual water level in the optical pickocff 59 monitoring vapor vessels 53, and therefore can prevent the dry ruuning situation of heating element heater 56 appearance.
Fig. 6 shows the section according to the 6th embodiment of the device 62 that is used to produce steam of the present invention.Device 62 comprises the container 63 that in fact is divided into cold water vessels 63a and vapor vessel 63b by partition 64.In the embodiment that illustrates, container 63 is partly filled by the water 65 that will evaporate.Cold water vessels 63a and vapor vessel 63b communicate with each other.Therefore, the water level among these two container 63a, 63b is identical.The bottom of container 63 is formed by thick-film heating element 66, the heating track 69 that this heating element heater 66 comprises metallic substrates 67, is arranged on the dielectric layer 68 in the described substrate 67 and is coated to described dielectric layer 68.Heating track 69 is applied as and makes heating element heater 66 be suitable for the special water that is present among the vapor vessel 63b that heats.Uncoated heating track below cold water vessels 63 is undesirably heated to stop the water that is comprised by cold water vessels 63a.Floating element 70 is used among the cold water vessels 63a, and this floating element 70 is free floating on the water level in cold water vessels 63a basically.Floating element 70 is electrically connected with control module 71.Described control module 71 further is connected to pump 72, and wherein control module 71 is set to start pump 72 according to the detected level in the container 63.By this way, can measuring container water level in 63, prevent the dry ruuning situation of heating element heater 66 simultaneously and wherein in container 63, have the situation of excessive water.By this way, the quantity of steam that can preferably in a certain amount of time, produce.
Fig. 7 shows the perspective view according to steam baker 73 of the present invention.Steam baker 73 comprises cure bag 74, and it is at present by door 75 sealings.In cure bag 74, use according to the device 76 that is used to produce steam of the present invention.The numerous embodiments of this steam generation device 76 has above been described.
Fig. 8 shows the schematic diagram that produces equipment 77 according to superheated steam of the present invention, and wherein steam under pressure provides the import 78 to flow-through heater 79, and flow-through heater 79 makes described steam superheating, to produce superheated steam at outlet 80 places.Steam under pressure is produced by the steam generator 81 that is supplied to liquid.The temperature sensor 82 at heater 79 outlets 80 places provides input to controller 83, and controller 83 is set to control the heating power of steam generator and/or heater 79, to keep predetermined temperature in outlet 80.Preferably, steam generator 81 does not produce steam from liquid basically.Described steam is crossed heating by flow-through heater 79 subsequently, and flow-through heater 79 can be for roughly as the spirality that discloses among the WO 2005/080885 heater that circulates, though preferably deflection plate is arranged in the spirality channel, to slow down vapor stream; Deflection plate can be provided by the spring that is arranged in the passage.In a kind of experimental example, flow-through heater sucks 320W, and output only 0.25 crust overvoltage reach 260 ℃ superheated steam.Superheated steam produces very apace, in 60 seconds after starting device.
Should be noted that above-mentioned embodiment explanation and do not limit the present invention, and those skilled in the art can design multiple replaceable embodiment under the condition of the scope that does not depart from the claim of enclosing.In claims, any Reference numeral that is placed between the round parentheses should not be interpreted as limiting claim.Verb " comprises " and the use of being out of shape is not precluded within element or other element outside the step or the existence of putting down in writing in the claim of step." a " or " an " before the element do not get rid of the existence of a plurality of this elements.In different mutually dependent claims, quote the true combination profit of not representing to adopt these measures of only having of some measure.
Claims (31)
1. device that is used to produce steam comprises:
At least one vapor vessel is used to collect the water that will evaporate;
At least one heating element heater is used to evaporate the water that is comprised by described vapor vessel,
At least one feed-water valve is used for water is provided to described vapor vessel,
Checkout gear, be used to detect in the vapor vessel water level and
Be connected to the control module of described feed-water valve and described checkout gear, described control module is set to drop to and open described feed-water valve when being lower than the predetermined critical water level being detected actual water level by described checkout gear, refills vapor vessel with water.
2. device according to claim 1, be characterised in that, checkout gear is set to detect the drying operation of at least a portion of described heating element heater, and control module is set to open feed-water valve when the dry operation of at least a portion that is detected described heating element heater by described checkout gear.
3. device according to claim 1 and 2 is characterised in that vapor vessel is limited by described heating element heater at least in part.
4. device according to claim 3 is characterised in that the general planar end face of described heating element heater limits the bottom of vapor vessel at least.
5. device according to claim 4 is characterised in that, the end face approximate horizontal orientation of heating element heater.
6. device according to claim 4 is characterised in that, the top surface inclination orientation of heating element heater.
7. according to each described device in the aforementioned claim, be characterised in that heating element heater comprises the thermal-conductivity substrate that is used to heat, be arranged on described suprabasil at least one first dielectric layer and be arranged at least one conductive heater track on described first dielectric layer.
8. device according to claim 7 is characterised in that checkout gear comprises:
At least one conductive sensor track, with a certain distance from described heating track and be arranged on described first dielectric layer and
At least one second dielectric layer is arranged on described first dielectric layer, and described second dielectric layer is connected at least a portion of described heating track and at least a portion of described sensor track.
9. device according to claim 8 is characterised in that, at least one heating track is positioned between first dielectric layer and second dielectric layer.
10. according to Claim 8 or 9 described devices, be characterised in that at least one heating track is positioned at the side away from first dielectric layer of second dielectric layer.
11. according to each described device among the claim 7-10, be characterised in that, heating element heater also comprises the temperature barrier that covers at least one heating orbit segment, described temperature barrier be suitable for predetermined increase temperature with the heating track make described at least one be capped the heating orbit segment and produce short circuit, increase thus described at least one be capped the heating orbit segment temperature, make described at least one be capped the heating orbit segment with destroyed, described heating track is irreversibly interrupted.
12., be characterised in that heating element heater comprises according to each described device in the aforementioned claim:
The first heating track with low relatively power density, the described first heating track be arranged on the higher part of vapor vessel and
The second heating track with high relatively power density, the described second heating track is arranged on the lower part of vapor vessel.
13. device according to claim 12 is characterised in that, the second heating track is arranged on the bottom side of vapor vessel, and the first heating track is arranged on the opposite side of vapor vessel.
14., be characterised in that the first heating track is arranged on the higher part of described first dielectric layer according to each described device among the claim 7-11,12 or 13, and the second heating track is positioned on the lower part of described first dielectric layer.
15., be characterised in that checkout gear is set to the drying operation by the part of the first heating track detection vapor vessel according to each described device among the claim 11-14.
16., be characterised in that checkout gear is suitable for monitoring the variations in temperature and/or the resistance variations of at least one heating track of heating element heater according to each described device among the claim 7-11,13 or 14.
17., be characterised in that this device also comprises the cold water vessels that is used to collect the water that will be delivered to vapor vessel according to each described device in the aforementioned claim.
18. device according to claim 17 is characterised in that, cold water vessels and vapor vessel container for being communicated with, and checkout gear is suitable for detecting the water level in the cold water vessels.
19., be characterised in that feed-water valve is set to be connected to water system, particularly water-main according to each described device in the aforementioned claim.
20., be characterised in that feed-water valve is a pump according to each described device in the aforementioned claim, and control module is suitable for regulating pump discharge according to the water level relevant information that checkout gear obtains.
21., be characterised in that this device also comprises the post-heater that was set to heat from the steam of vapor vessel reception according to each described device in the aforementioned claim.
22. device according to claim 21 is characterised in that, described post-heater is formed by flow-through heater.
23. one kind is used in according to the heating element heater in each the device among the claim 11-13, is characterised in that this heating element heater comprises:
Have low relatively power density first the heating track and
The second heating track with high relatively power density.
24. electrical equipment that is provided with according to each heating element heater among the claim 1-22.
25. a method of passing through to produce according to each device among the claim 1-22 steam comprises the steps:
A) adopt the water that will evaporate to fill vapor vessel,
B) start heating element heater, at least a portion of evaporating the water that comprises at first by vapor vessel thus,
C) by the water level in the checkout gear detection vapor vessel, and
D) drop to and open feed-water valve when being lower than the predetermined critical water level detecting actual water level, to refill vapor vessel.
26. method according to claim 25, be characterised in that, at step C) during, dry ruuning situation or approaching dry ruuning situation appear at least a portion of described heating element heater, and at step D) during, when appearring at least a portion that detects described heating element heater, dry ruuning situation opens feed-water valve.
27., be characterised in that, at step C according to claim 25 or 26 described methods) during, the leakage current that is derived from least one heating track of heating element heater by measurement comes sensed water level.
28., be characterised in that, at step C according to each described method among the claim 25-27) during, the temperature and/or the resistance variations of at least one the heating track by measuring heating element heater are come sensed water level.
29., be characterised in that, at step C according to each described method among the claim 25-28) during, by measure with cold water vessels that vapor vessel is communicated with in water level come sensed water level.
30., be characterised in that this method also comprises step e according to each described method among the claim 25-29), step e) comprise that the steam guiding that will produce is by being used to produce the post-heater of superheated steam in vapor vessel.
31., be characterised in that this method also comprises step F according to each described method among the claim 25-30), step F) be included in when detecting actual water level and surpassing predetermined critical maximum stage, close feed-water valve, to stop refilling of vapor vessel.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2001690 | 2008-06-16 | ||
| NL2001690A NL2001690C2 (en) | 2008-06-16 | 2008-06-16 | Device and method for generating steam, and heating element for use in such a device. |
| PCT/NL2009/050350 WO2009154450A1 (en) | 2008-06-16 | 2009-06-16 | Device and method for generating steam, and heating element for use in such a device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102124265A true CN102124265A (en) | 2011-07-13 |
Family
ID=40345221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009801318875A Pending CN102124265A (en) | 2008-06-16 | 2009-06-16 | Device and method for generating steam, and heating element for use in such a device |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2313685A1 (en) |
| CN (1) | CN102124265A (en) |
| NL (1) | NL2001690C2 (en) |
| WO (1) | WO2009154450A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102679302A (en) * | 2012-05-16 | 2012-09-19 | 昆山新莱洁净应用材料股份有限公司 | Electrothermal steam generator |
| CN107062182A (en) * | 2017-03-31 | 2017-08-18 | 广东美的厨房电器制造有限公司 | Steam generator and steam-heating apparatus |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101869427B (en) * | 2010-06-22 | 2012-07-04 | 晶辉科技（深圳）有限公司 | Electric steamer and control method thereof |
| DE102012202374A1 (en) * | 2012-02-16 | 2013-08-22 | Webasto Ag | Vehicle heating and method for producing a vehicle heater |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4924072A (en) * | 1987-05-14 | 1990-05-08 | Delaware Capital Formation, Inc. | Humidity control for oven chamber |
| GB2356337B (en) * | 1996-10-16 | 2001-08-01 | Otter Controls Ltd | Improvements relating to electrically heated water boiling vessels |
| GB2353457B (en) * | 1999-08-13 | 2004-08-25 | Strix Ltd | Electric heaters |
| GB2373157B (en) * | 2001-03-05 | 2004-12-15 | Strix Ltd | Thick film heaters and resistances |
| US8680443B2 (en) * | 2004-01-06 | 2014-03-25 | Watlow Electric Manufacturing Company | Combined material layering technologies for electric heaters |
| JP3722820B2 (en) * | 2004-02-27 | 2005-11-30 | シャープ株式会社 | Steam cooker |
| KR101041077B1 (en) * | 2006-09-28 | 2011-06-13 | 삼성전자주식회사 | Steam generator and heating cooker having the same |
| KR20080065134A (en) * | 2007-01-08 | 2008-07-11 | 삼성전자주식회사 | Water level sensor and steam generator having the same and heating cooker having the steam generator and control method thereof |
-
2008
- 2008-06-16 NL NL2001690A patent/NL2001690C2/en not_active IP Right Cessation
-
2009
- 2009-06-16 EP EP09766868A patent/EP2313685A1/en not_active Withdrawn
- 2009-06-16 WO PCT/NL2009/050350 patent/WO2009154450A1/en active Application Filing
- 2009-06-16 CN CN2009801318875A patent/CN102124265A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102679302A (en) * | 2012-05-16 | 2012-09-19 | 昆山新莱洁净应用材料股份有限公司 | Electrothermal steam generator |
| CN107062182A (en) * | 2017-03-31 | 2017-08-18 | 广东美的厨房电器制造有限公司 | Steam generator and steam-heating apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2313685A1 (en) | 2011-04-27 |
| NL2001690C2 (en) | 2009-12-17 |
| WO2009154450A1 (en) | 2009-12-23 |
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Application publication date: 20110713 |