CA1193875A - Lid-shaped reflux condenser for cookers - Google Patents
Lid-shaped reflux condenser for cookersInfo
- Publication number
- CA1193875A CA1193875A CA000425736A CA425736A CA1193875A CA 1193875 A CA1193875 A CA 1193875A CA 000425736 A CA000425736 A CA 000425736A CA 425736 A CA425736 A CA 425736A CA 1193875 A CA1193875 A CA 1193875A
- Authority
- CA
- Canada
- Prior art keywords
- reflux condenser
- metal holder
- storage material
- lid
- heat
- 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
Links
Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/06—Lids or covers for cooking-vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J36/00—Parts, details or accessories of cooking-vessels
- A47J36/38—Parts, details or accessories of cooking-vessels for withdrawing or condensing cooking vapors from cooking utensils
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cookers (AREA)
Abstract
ABSTRACT:
Usual cooking pots are covered with a latent heat accumulator by which the cooking vapours are con-densed at normal pressure and are refluxed to the food.
Usual cooking pots are covered with a latent heat accumulator by which the cooking vapours are con-densed at normal pressure and are refluxed to the food.
Description
~ ~3~
., PHD 82-035 1 4.1.1983 Lid-shaped reflux condenser for cookers.
The invention relates to a lid-shaped reflux condenser for cookers, in particular cooking pots.
Such a reflux condenser is known from DE-PS
36 158. It consists of a lid in which cooling ducts are provided in which cooling ~ater circulates which is fed and drained from a lid hinge. The water circulating through the cooling ducts cools the lower surface of the lid so that the rising vapours condense on said surface and fall back into the boiling mass again in the form of droplets.
10 In this manner not only the escape of unpleasant or detri~
mental vapours is avoided but the possible escape of useful components of the boiled mass is also prevented.
The known lid has for its disadvantage that it continuously needs fresh cooling water and requires an 15 expensive construction of the connections for the cooling duc-ts. Furthermore, sealing proble~s occur at the connec-tions. Moreover the efficiency of the cooling by circulating water is unsatisfactory.
It is the object of the invention to provide 20 a structurally simple and at the same time effective lid-~ike reflux condenser for cookers.
~ccording to the invention this object is achieved in that the reflux condenser comprises a latent hea-t ac-cumula-tor.
So it is the object of the invention to cover the conventional cooking pots with a ]atent heat accumula-tor by which the cooking vapours are condensed at normal pressure and are refluxed to the food again.
The accumulator preferably consists of a flat 30 (for example, dish shaped or discus-shaped)metal holder which is filled with a heat-storage material. The metal holder preferably comprises cavities or bulges for receiving water vapour and for increasing the cooling area. It is ?~ S
PHD 82-035 2 l~ 1.1983 also possible to provide several metal holders which have, for example, the shape of accumulator plates, one on top of the other so as to ensure a sufficient conden-sation even when larger quanti-ties of vapour are presented.
In this case the cavities are provided between at least
., PHD 82-035 1 4.1.1983 Lid-shaped reflux condenser for cookers.
The invention relates to a lid-shaped reflux condenser for cookers, in particular cooking pots.
Such a reflux condenser is known from DE-PS
36 158. It consists of a lid in which cooling ducts are provided in which cooling ~ater circulates which is fed and drained from a lid hinge. The water circulating through the cooling ducts cools the lower surface of the lid so that the rising vapours condense on said surface and fall back into the boiling mass again in the form of droplets.
10 In this manner not only the escape of unpleasant or detri~
mental vapours is avoided but the possible escape of useful components of the boiled mass is also prevented.
The known lid has for its disadvantage that it continuously needs fresh cooling water and requires an 15 expensive construction of the connections for the cooling duc-ts. Furthermore, sealing proble~s occur at the connec-tions. Moreover the efficiency of the cooling by circulating water is unsatisfactory.
It is the object of the invention to provide 20 a structurally simple and at the same time effective lid-~ike reflux condenser for cookers.
~ccording to the invention this object is achieved in that the reflux condenser comprises a latent hea-t ac-cumula-tor.
So it is the object of the invention to cover the conventional cooking pots with a ]atent heat accumula-tor by which the cooking vapours are condensed at normal pressure and are refluxed to the food again.
The accumulator preferably consists of a flat 30 (for example, dish shaped or discus-shaped)metal holder which is filled with a heat-storage material. The metal holder preferably comprises cavities or bulges for receiving water vapour and for increasing the cooling area. It is ?~ S
PHD 82-035 2 l~ 1.1983 also possible to provide several metal holders which have, for example, the shape of accumulator plates, one on top of the other so as to ensure a sufficient conden-sation even when larger quanti-ties of vapour are presented.
In this case the cavities are provided between at least
2 metal holders placed one on top of the other.
As heat-storage materials are to be considered such materials which have a heat of fusion w}lich is as great as possible and melt reproducibly at a temperature between 25 and 95 C. In order to ensure a reproducible crystallization without larger super-cooling small quanti-ties of nucleating agen-t may also be added to the heat storage material. For example, the following hydrates can very readily be used as a heat storage material:
1. CaC12 . 6H2o + o.o57b by wei~ht BaC03 melting point: 29C
2. NaOOCCH3 . 3H20 melting point: 58C
g~ 3)2 2 melting points 89 C
The necessary quantity of heat-storage material and hence the proportioning of the metal holders and ac-cumulator plates, respectively, depend on the capacity andthe dimensions of the cooker in question as well as on the planned duration of cooking which, for example, for vege-tables is approximately 10 to 30 minutes. As an indication may hold good that for a commercial 2 litre cooker 1 to 2 kg of NaOOCCH3 . 3 H20 are required. Generally speaking the thickness of the accumulator plates filled with heat-storage material should preferably be 0.5 to 2 cm.
The accumulator is automatically regencrated again in that the thermal energy -taken up during the condensation of the cooking vapour and consumed for fusing the hea-t storage material is given off to the cooler surroundings. The heat s-torage material solidifies again and becomes automatically ready for a new cooking operation.
This comparatively slow regeneration process can additionally undertake a very useful function in the household. The hot plates which are ~ept at the fllsion te~nperature of the heat storage material by -the melting heat for quite a period of time can in fact be used as 37~i PHD 82-035 3 4.1.1983 SUC}l as plate-warmers. The pla-tes are suitable both as a plate-warmer stand and as a plate-warmer lid for pots and dishes of nearly any shape.
AdvantaFes of the reflux condenser:
1. No water vapour load of the house and consequently a saving of energy.
2. No smell load of the house; aromas remain in -the food.
As heat-storage materials are to be considered such materials which have a heat of fusion w}lich is as great as possible and melt reproducibly at a temperature between 25 and 95 C. In order to ensure a reproducible crystallization without larger super-cooling small quanti-ties of nucleating agen-t may also be added to the heat storage material. For example, the following hydrates can very readily be used as a heat storage material:
1. CaC12 . 6H2o + o.o57b by wei~ht BaC03 melting point: 29C
2. NaOOCCH3 . 3H20 melting point: 58C
g~ 3)2 2 melting points 89 C
The necessary quantity of heat-storage material and hence the proportioning of the metal holders and ac-cumulator plates, respectively, depend on the capacity andthe dimensions of the cooker in question as well as on the planned duration of cooking which, for example, for vege-tables is approximately 10 to 30 minutes. As an indication may hold good that for a commercial 2 litre cooker 1 to 2 kg of NaOOCCH3 . 3 H20 are required. Generally speaking the thickness of the accumulator plates filled with heat-storage material should preferably be 0.5 to 2 cm.
The accumulator is automatically regencrated again in that the thermal energy -taken up during the condensation of the cooking vapour and consumed for fusing the hea-t storage material is given off to the cooler surroundings. The heat s-torage material solidifies again and becomes automatically ready for a new cooking operation.
This comparatively slow regeneration process can additionally undertake a very useful function in the household. The hot plates which are ~ept at the fllsion te~nperature of the heat storage material by -the melting heat for quite a period of time can in fact be used as 37~i PHD 82-035 3 4.1.1983 SUC}l as plate-warmers. The pla-tes are suitable both as a plate-warmer stand and as a plate-warmer lid for pots and dishes of nearly any shape.
AdvantaFes of the reflux condenser:
1. No water vapour load of the house and consequently a saving of energy.
2. No smell load of the house; aromas remain in -the food.
3. Simul-taneous availability of plate-warmers without additional expenditure of labour and energy.
4. Construction, maintenance and cleaning are as simple as possible.
5. Can be used as such for most of the conventional cookers and service pots.
A few embodiments of the invention are shown in lS the drawing and will be described in detail hereinafter.
Figure 1 is a sectional vicw of a cooker having a lid-like reflux condenser.
Figures 2 and 3 are perspective views, partly brokon away of a lid-like reflux condenser, and Figure 4 is a sectional view of a cooker having the reflux condenser shown in Figures 2 and 3.
Figure 1 shows a cooking pot 1 which is filled partly with water 2 and with food (not shown) which is to be stewed or cookedO The cooking pot is covered with an accumulator plate 3 which has a cylindrical continuous aperture 4 in its center. A second accumulator plate 5 (without aper-ture) is present over the accumulator plate 3. The heat-storage material inside the accumulator plates is shown shaded. The accumulator plates comprise several handles 6 with stands. Between the edge of -the cooking pot 1 and the lower accumulator plate 3 a rubber member 7 is presen-t which is connected to the accurnulator plate 3. The gaseous water vapour with odours formed during cooking or stewing are indicated by broken-line-arrows;
the solid-line-arrows indicate liquid water condensate with odours.
After termination of the cooking process the lower accumulator plate 3 may remain on the cooking pot 3,~
PHD 82-035 4 40l.1983 1 to keep the food warm, while the top plate 5 may serve as a plate-warmer stand for a dish on the dining table.
Particularly suitable as a heat storage material for -the condenser consisting of two circular plates is CH3COONa . 3H20 (Fusion temperature = 58 C) since the tem-perature at which latent heat is stored is suitable both for -the condensation of the coolcing water and for the sub-sequent keeping warm of ser-~ice dishes. Moreover, sodium acetate has a comparatively high heat capacity of 2.79 kJ/
kg and a heat of fusion of 289 kJ/dm3 and is cheap and unpoinonous.
A difficulty, however, is its strong tendency to supercooling (about 20 to 40 C). Although this can be 3( 4)2 8~2o or SrC204 . H20 9 the method is not reliable and for reasons not yet e~plained (ageing?, conversion?) said nucleating action can fail partly or entirely.
Other heat-storage materials such as CaC12 . 6H2o or Na2HP04 . 12H20 which are also suitable for use in reflux condensers also tend to supercooling.
Ln order to exclude said supcrcooling it is advantageous to provide the accumulator plates 3 and 5, as shown in Figure 4, with har~dles 6 of tube which are open towards the inside of the accumulator plates. Said tube handles 6 are filled with heat-storage material 8 which i9 in direct contact with the same heat-storage material in the plates. The heat-storage material 8 is shown dotted in Figurc 4 (so different frorn Figure I) to indicate that different heat storage materials can be used.
Since the handles 6 are laterally in the air and do not contact the hot cooking vapour, they remain comparatively cool. The heat storage material in the handles is thus not melted when the plates are used and the nucleation occurs without inhibition starting from said solid residual substance in the handle tubes over the whole accumulator plate.
Moreover the handles 6 serve for eas~er ~ 3~75 PHD 82_035 5 L~. 1.1983 handling. In order that they should not become too :hot also after very intensive and long cooking, they should be manufactured as much as possible from thin-walled tube and thermally poorly conducting material, for example, Cr/Ni steel.
For a better heat trans~er of vapour to the pla-te walls and hence ~or the better condensation, the vapour flowing through the hole in the lower plate is reciprocated by guides 9 in the slot be-tween the two plates (Figure L~; in Figure 3 the ~lowing vapour is indica-ted by arrows).
For a better heat -transfer from the plate walls in the heat storage material, heat guides 10 are provided radially in the interior of the two plates and are in good thermal contact with the plate walls (Figures 2 and 4).
. .
A few embodiments of the invention are shown in lS the drawing and will be described in detail hereinafter.
Figure 1 is a sectional vicw of a cooker having a lid-like reflux condenser.
Figures 2 and 3 are perspective views, partly brokon away of a lid-like reflux condenser, and Figure 4 is a sectional view of a cooker having the reflux condenser shown in Figures 2 and 3.
Figure 1 shows a cooking pot 1 which is filled partly with water 2 and with food (not shown) which is to be stewed or cookedO The cooking pot is covered with an accumulator plate 3 which has a cylindrical continuous aperture 4 in its center. A second accumulator plate 5 (without aper-ture) is present over the accumulator plate 3. The heat-storage material inside the accumulator plates is shown shaded. The accumulator plates comprise several handles 6 with stands. Between the edge of -the cooking pot 1 and the lower accumulator plate 3 a rubber member 7 is presen-t which is connected to the accurnulator plate 3. The gaseous water vapour with odours formed during cooking or stewing are indicated by broken-line-arrows;
the solid-line-arrows indicate liquid water condensate with odours.
After termination of the cooking process the lower accumulator plate 3 may remain on the cooking pot 3,~
PHD 82-035 4 40l.1983 1 to keep the food warm, while the top plate 5 may serve as a plate-warmer stand for a dish on the dining table.
Particularly suitable as a heat storage material for -the condenser consisting of two circular plates is CH3COONa . 3H20 (Fusion temperature = 58 C) since the tem-perature at which latent heat is stored is suitable both for -the condensation of the coolcing water and for the sub-sequent keeping warm of ser-~ice dishes. Moreover, sodium acetate has a comparatively high heat capacity of 2.79 kJ/
kg and a heat of fusion of 289 kJ/dm3 and is cheap and unpoinonous.
A difficulty, however, is its strong tendency to supercooling (about 20 to 40 C). Although this can be 3( 4)2 8~2o or SrC204 . H20 9 the method is not reliable and for reasons not yet e~plained (ageing?, conversion?) said nucleating action can fail partly or entirely.
Other heat-storage materials such as CaC12 . 6H2o or Na2HP04 . 12H20 which are also suitable for use in reflux condensers also tend to supercooling.
Ln order to exclude said supcrcooling it is advantageous to provide the accumulator plates 3 and 5, as shown in Figure 4, with har~dles 6 of tube which are open towards the inside of the accumulator plates. Said tube handles 6 are filled with heat-storage material 8 which i9 in direct contact with the same heat-storage material in the plates. The heat-storage material 8 is shown dotted in Figurc 4 (so different frorn Figure I) to indicate that different heat storage materials can be used.
Since the handles 6 are laterally in the air and do not contact the hot cooking vapour, they remain comparatively cool. The heat storage material in the handles is thus not melted when the plates are used and the nucleation occurs without inhibition starting from said solid residual substance in the handle tubes over the whole accumulator plate.
Moreover the handles 6 serve for eas~er ~ 3~75 PHD 82_035 5 L~. 1.1983 handling. In order that they should not become too :hot also after very intensive and long cooking, they should be manufactured as much as possible from thin-walled tube and thermally poorly conducting material, for example, Cr/Ni steel.
For a better heat trans~er of vapour to the pla-te walls and hence ~or the better condensation, the vapour flowing through the hole in the lower plate is reciprocated by guides 9 in the slot be-tween the two plates (Figure L~; in Figure 3 the ~lowing vapour is indica-ted by arrows).
For a better heat -transfer from the plate walls in the heat storage material, heat guides 10 are provided radially in the interior of the two plates and are in good thermal contact with the plate walls (Figures 2 and 4).
. .
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A lid-shaped reflux condenser for cookers, char-acterized in that it comprises at least one latent heat accumulator which consists of a metal holder containing a heat storage material.
2. A reflux condenser as claimed in Claim 1, char-acterized in that the latent heat accumulator consists of at least one flat metal holder which is filled with a heat storage material.
3. A reflux condenser as claimed in Claim 2, char-acterized in that the metal holder comprises cavities or bulges for receiving water vapour and for increasing the cooling area.
4. A reflux condenser as claimed in Claim 3, char-acterized in that the cavities are provided between at least 2 metal holders placed one on top of the other.
5. A reflux condenser as claimed in Claim 2, 3 or 4, characterized in that the metal holder(s) are filled with CaC12 . 6H2O + 0.05% by weight BaCO3, NaOOCCH3 . 3H2O
or Mg (NO3)2 . 6 H2O as a heat storage material.
or Mg (NO3)2 . 6 H2O as a heat storage material.
6. A reflux condenser as claimed in Claim 2 , 3 or 4, characterized in that the metal holder(s) constructed as latent heat accumulating plates are approximately 0.5 to 2 cm thick.
7. A reflux condenser as claimed in Claim 2, 3 or 4, characterized in that the metal holder(s) comprise hollow handles the hollow spaces of which are open towards the interior of the metal holder(s) and filled with heat storage material.
8. A reflux condenser as claimed in Claim 2, 3 or 4, characterized in that the metal holder(s) are con-structed so that after termination of the cooking process they may be used as plate warmers.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3213852.0 | 1982-04-15 | ||
| DE19823213852 DE3213852A1 (en) | 1982-04-15 | 1982-04-15 | LID-REFLECTED CONDENSER FOR COOKING VESSELS |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1193875A true CA1193875A (en) | 1985-09-24 |
Family
ID=6160966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000425736A Expired CA1193875A (en) | 1982-04-15 | 1983-04-13 | Lid-shaped reflux condenser for cookers |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0092277B1 (en) |
| JP (1) | JPS58188416A (en) |
| AT (1) | ATE29374T1 (en) |
| CA (1) | CA1193875A (en) |
| DE (2) | DE3213852A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0362528U (en) * | 1989-06-07 | 1991-06-19 | ||
| CN1105541C (en) * | 1996-02-12 | 2003-04-16 | 李钟浣 | Cooker with liquefaction means |
| DE19928964A1 (en) * | 1999-06-24 | 2001-01-04 | Rational Ag | Storage element for storing energy and device using the same |
| KR20030023410A (en) * | 2001-09-13 | 2003-03-19 | 심호웅 | Distilled water automatic separation recovery device |
| NL2010793C2 (en) * | 2013-05-13 | 2014-11-24 | Lemkes Jan-Willem | COMPOSITION OF A PAN AND A LID, AND A LID FOR SUCH A COMPOSITION. |
| DE202017005465U1 (en) * | 2017-06-19 | 2017-11-24 | Fidcon Business Consulting Gmbh | Steam ring for cookware |
| CN112043169B (en) * | 2019-06-06 | 2022-02-25 | 佛山市顺德区美的电热电器制造有限公司 | Pot cover assembly of cooking utensil and cooking utensil |
| DE102020210401A1 (en) * | 2020-08-14 | 2022-02-17 | Wmf Group Gmbh | Saucepan lid for condensing water vapor and method of making same |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE79924C (en) * | ||||
| DE36158C (en) * | C. AUG. SCHMIDT SÖHNE in Hamburg | Lid for cooking vessels with cooling device | ||
| DE2834841A1 (en) * | 1978-08-09 | 1980-02-21 | Ernst Messmer | Low pressure steamer for cooking food - has steam condenser forming lid preventing escape of steam but reducing cooking time |
| FR2447174A1 (en) * | 1979-01-24 | 1980-08-22 | Cidelcem | Thermally insulating food dish with cover - has triple walled cavity construction with inner cavity filled with paraffin and outer cavity evacuated |
| DE2931824C2 (en) * | 1979-08-06 | 1982-04-22 | Bosch-Siemens Hausgeräte GmbH, 7000 Stuttgart | Household clothes dryer |
| US4304106A (en) * | 1980-02-29 | 1981-12-08 | Donnelly William R | Institutional serving tray |
-
1982
- 1982-04-15 DE DE19823213852 patent/DE3213852A1/en not_active Withdrawn
-
1983
- 1983-04-13 EP EP83200523A patent/EP0092277B1/en not_active Expired
- 1983-04-13 DE DE8383200523T patent/DE3373408D1/en not_active Expired
- 1983-04-13 JP JP58063839A patent/JPS58188416A/en active Granted
- 1983-04-13 AT AT83200523T patent/ATE29374T1/en active
- 1983-04-13 CA CA000425736A patent/CA1193875A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3213852A1 (en) | 1983-10-27 |
| JPH0419846B2 (en) | 1992-03-31 |
| JPS58188416A (en) | 1983-11-02 |
| EP0092277B1 (en) | 1987-09-09 |
| ATE29374T1 (en) | 1987-09-15 |
| EP0092277A1 (en) | 1983-10-26 |
| DE3373408D1 (en) | 1987-10-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |