EP0667486B1 - Instantaneous accumulating steam generator - Google Patents

Instantaneous accumulating steam generator Download PDF

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Publication number
EP0667486B1
EP0667486B1 EP95100289A EP95100289A EP0667486B1 EP 0667486 B1 EP0667486 B1 EP 0667486B1 EP 95100289 A EP95100289 A EP 95100289A EP 95100289 A EP95100289 A EP 95100289A EP 0667486 B1 EP0667486 B1 EP 0667486B1
Authority
EP
European Patent Office
Prior art keywords
steam
boiler
cover
steam generator
orifice
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
Application number
EP95100289A
Other languages
German (de)
French (fr)
Other versions
EP0667486A1 (en
Inventor
Stefano Sassi
Virginio Sassi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
R E A SNC Di Sassi E Baudin and C
Original Assignee
R E A SNC Di Sassi E Baudin and C
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by R E A SNC Di Sassi E Baudin and C filed Critical R E A SNC Di Sassi E Baudin and C
Publication of EP0667486A1 publication Critical patent/EP0667486A1/en
Application granted granted Critical
Publication of EP0667486B1 publication Critical patent/EP0667486B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention refers to an instantaneous accumulating steam generator.
  • Resistances usually have poor wear resistance due both to the high temperature and to the reduced water volume created by the pressure decrease range.
  • Object of the present invention is to overcome said drawbacks by providing a steam generator of the above-mentioned type in which the amount of produced steam and the amount of required steam are balanced, without creating a strong condensate entrainment and without excessively stressing the resistances.
  • a further object of the steam generator according to the invention is to avoid false level signals on the internal probe, due to condensate deposit formation on the probe after the entrainment occurring on the flange.
  • said conveyor 11 is of a winding shape, with neck 15 in the Venturi-like tube (see Fig. 3), said neck being adapted so as to facilitate and speed up the steam flow from the boiler 1 to a vessel 17 located downstream.
  • the steam enters said vessel 17 through an inlet conveyor 19, also equipped with neck 21 in the Venturi-like tube, said inlet conveyor 19 being aligned with the outlet conveyor 11 from the boiler 1 and completing the function of softening for the steam flow from said boiler 1 to said vessel 17.
  • the probe 23 inside the boiler 1 is equipped with a protection chamber 25 for protecting the stem 27 of said probe 23 from condensate deposit formation caused by the pressure decrease occurring on the flange lower surface as well as from false water level signals, caused by the displacement of said water volume by pressure decrease.
  • the resistances 29, with which the boiler 1 is equipped are provided at a very long distance between end portion 31 thereof and flange 5, in order to avoid those strong, sudden changes of temperature to which usual resistances are subject.
  • the resistances 29 are of the same type so far used in these steam generators.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices For Medical Bathing And Washing (AREA)
  • Control Of Steam Boilers And Waste-Gas Boilers (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Commercial Cooking Devices (AREA)

Description

The present invention refers to an instantaneous accumulating steam generator.
It is known that, in prior art instantaneous steam generators, unbalance conditions occur between steam consumption and steam generation inside the steam chamber.
This is due to the chamber internal volume and to the internal pressure decrease range that brings about an increase in water level, thus decreasing the steam volume.
Moreover, the flange surface allows a humidity entrainment due to the pressure decrease occurring during the steam flow from steam chamber to solenoid valve.
Resistances usually have poor wear resistance due both to the high temperature and to the reduced water volume created by the pressure decrease range.
GB-A-623 154, which represents the closest prior art, discloses an accumulating steam generator as described in the preamble of Claim 1.
Object of the present invention is to overcome said drawbacks by providing a steam generator of the above-mentioned type in which the amount of produced steam and the amount of required steam are balanced, without creating a strong condensate entrainment and without excessively stressing the resistances.
A further object of the steam generator according to the invention is to avoid false level signals on the internal probe, due to condensate deposit formation on the probe after the entrainment occurring on the flange.
These and further objects together with other features and advantages, are attained by the instantaneous steam generator of the invention, as claimed in Claim 1.
Further characteristics and advantages of the invention will appear from the following detailed description of an embodiment thereof, given as a non-limiting example, with reference to the accompanying drawings, in which:
  • Fig. 1 is a side elevation view of a longitudinal section of the steam generator of the invention;
  • Fig. 2 is a top plan view of the boiler of said generator;
  • Fig. 3 is a side elevation view of a longitudinal section of the outlet conveyor applied to an outlet opening of said boiler;
  • Fig. 4 is a side elevation view of a longitudinal section of the inlet conveyor or mouth applied to the inlet opening of the steam vessel or "plenum chamber" applied to the boiler.
    • As clearly shown in the Figures, the steam generator of the invention comprises substantially a small boiler 1 to which a cover 5 is sealingly fixed in 3; this cover 5 is usually plane and is secured in place by a plurality of through bolts 7 extending through said cover 5 and a suitable circular projection 9 provided on the outside cylindrical wall of the boiler 1.
    Centrally to the cover 5, a central, funnelled steam conveyor 11 is provided, from the inside to the outside of the steam chamber 13, designed in such a way as to gently draw steam from inside said steam chamber 13.
    For that purpose, said conveyor 11 is of a winding shape, with neck 15 in the Venturi-like tube (see Fig. 3), said neck being adapted so as to facilitate and speed up the steam flow from the boiler 1 to a vessel 17 located downstream.
    Said vessel 17 is provided outside the generator boiler 1, and it is centrally located with respect to the conveyor 11, and operates as steam "plenum chamber".
    The steam enters said vessel 17 through an inlet conveyor 19, also equipped with neck 21 in the Venturi-like tube, said inlet conveyor 19 being aligned with the outlet conveyor 11 from the boiler 1 and completing the function of softening for the steam flow from said boiler 1 to said vessel 17.
    The steam will be sent to users through an outlet hole 21, provided in the Figure on top of the vessel 17, and also equipped with funnelled mouth.
    The probe 23 inside the boiler 1 is equipped with a protection chamber 25 for protecting the stem 27 of said probe 23 from condensate deposit formation caused by the pressure decrease occurring on the flange lower surface as well as from false water level signals, caused by the displacement of said water volume by pressure decrease.
    The resistances 29, with which the boiler 1 is equipped, are provided at a very long distance between end portion 31 thereof and flange 5, in order to avoid those strong, sudden changes of temperature to which usual resistances are subject.
    As for the rest, the resistances 29 are of the same type so far used in these steam generators.

    Claims (3)

    1. Accumulating steam generator comprising a boiler (1) with a cover (5) being sealingly fixed thereto by a plurality of through bolts (7) extending through the cover (5) and a suitable circular flange (9) provided on the outside cylindrical wall of the boiler (1), the boiler (1) and cover (5) enclosing a steam chamber (13), and resistance heating elements (29) extending through the cover (5),
      characterized by:
      a central funneled steam outlet orifice (11) having curved walls to enable a smooth discharge flow of steam from the steam chamber (13),
      a steam accumulator vessel (17) located outside of the boiler (1) for receiving steam from the outlet orifice (11) along a common axis, the accumulator vessel having an outlet hole (21) for delivering steam to a user without fluctuations in the balance of water and steam inside the boiler (1),
      a water level probe (23) having a probe stem (27) which is arranged inside the boiler (1) and surrounded by a protection chamber (25) for protecting the probe stem (27) against condensate deposits generating false water level signals, and
      the resistance heating elements (29) being outwardly extended to create a distance between outer end portions (31) thereof and the cover (5) sufficient to avoid strong and sudden temperature changes of the heating elements (29).
    2. Steam generator according to claim 1, characterized in that the outlet orifice (11) comprises a first orifice part formed as a Venturi-like tube with a throat (15) adapted to facilitate and accelerate the discharge flow of the steam from the boiler (1) to the accumulator vessel (17), and a second orifice part (19) which is aligned with said first orifice part downstream thereof and also formed as a Venturi-like tube comprising a throat (21).
    3. Steam generator according to claim 1 or 2, characterized in that the outlet hole (21) is provided at the top side of the accumulator vessel (17) and equipped with a funneled mouth.
    EP95100289A 1994-02-10 1995-01-11 Instantaneous accumulating steam generator Expired - Lifetime EP0667486B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    IT94TO000074A IT1268020B1 (en) 1994-02-10 1994-02-10 STORAGE INSTANT STEAM GENERATOR
    ITTO940074 1994-02-10

    Publications (2)

    Publication Number Publication Date
    EP0667486A1 EP0667486A1 (en) 1995-08-16
    EP0667486B1 true EP0667486B1 (en) 1998-04-22

    Family

    ID=11412126

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95100289A Expired - Lifetime EP0667486B1 (en) 1994-02-10 1995-01-11 Instantaneous accumulating steam generator

    Country Status (5)

    Country Link
    EP (1) EP0667486B1 (en)
    DE (1) DE69502122T2 (en)
    DK (1) DK0667486T3 (en)
    ES (1) ES2116625T3 (en)
    IT (1) IT1268020B1 (en)

    Families Citing this family (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    IT248014Y1 (en) * 1999-03-10 2002-12-09 Euro Star Srl CASE FOR STEAM GENERATOR FOR HOUSEHOLD APPLIANCES

    Family Cites Families (10)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US1430927A (en) * 1922-10-03 Rest available cop
    US1504251A (en) * 1923-04-13 1924-08-12 Richard H Lansing Steam generator
    US2220353A (en) * 1939-10-25 1940-11-05 Julius K Sebo Portable steam generator
    US2478569A (en) * 1945-03-08 1949-08-09 Cooper Harry Peter Steam generator
    GB623154A (en) * 1947-04-22 1949-05-12 Gen Electric Co Ltd Improvements in or relating to steam raisers
    NO813278L (en) * 1981-09-28 1983-03-29 Sigurd Heien BOILER.
    DE3532261A1 (en) * 1985-09-10 1987-03-19 Riba Guenther Steam generator
    US4881493A (en) * 1986-03-11 1989-11-21 Riba Guenther Steam generator
    SE459762B (en) * 1986-06-24 1989-07-31 Tecator Ab AN ELECTRICALLY HEATED STEAM GENERATOR WITH A CONTAINER CONTAINING TWO COMMUNICATING CHAMBERS, WHERE ONE Chamber HAS THE HEATING ELEMENT AND THE OTHER A LEVEL DETECTOR
    FR2625794B1 (en) * 1988-01-08 1990-05-04 Bourgeois Ste Coop Production WATER VAPOR GENERATOR FOR COOKING APPLIANCE

    Also Published As

    Publication number Publication date
    ES2116625T3 (en) 1998-07-16
    DE69502122D1 (en) 1998-05-28
    DK0667486T3 (en) 1999-02-22
    ITTO940074A1 (en) 1995-08-10
    EP0667486A1 (en) 1995-08-16
    IT1268020B1 (en) 1997-02-20
    ITTO940074A0 (en) 1994-02-10
    DE69502122T2 (en) 1998-08-13

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