EP0040029A2 - Liquid heater - Google Patents
Liquid heater Download PDFInfo
- Publication number
- EP0040029A2 EP0040029A2 EP81301945A EP81301945A EP0040029A2 EP 0040029 A2 EP0040029 A2 EP 0040029A2 EP 81301945 A EP81301945 A EP 81301945A EP 81301945 A EP81301945 A EP 81301945A EP 0040029 A2 EP0040029 A2 EP 0040029A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cap
- vessel
- cavity
- lip
- liquid
- 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.)
- Withdrawn
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/02—Casings; Cover lids; Ornamental panels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/22—Water heaters other than continuous-flow or water-storage heaters, e.g. water heaters for central heating
Definitions
- the present invention relates to liquid heaters and more particularly but not exclusively to heaters for spa and swimming pools.
- the present heater is also applicable to the chemical industry.
- heaters in particular for spas and swimming pools have not been specifically designed for that environment, and accordingly suffer from several disadvantages due to their expected working conditions. These disadvantages in particular include a short working life due to chemical attack, and loss of efficiency. Additionally these heaters have traditionally been complex in structure and correspondingly expensive to manufacture.
- liquid heating device comprising:
- the heater 10 has a body 11 defining a chamber 21 through which liquid, entering the body 11 by inlet 19 and leaving via outlet 18, may be heated by electric heating elements (not depicted) extending into the chamber 21.
- the heating elements are covered by Teflon (Registered Trade Mark) or Fluron'.(Registered Trade Mark) so as to resist chemical attack.
- the top of the body 11 is provided with an annular portion 20 having internal and external threads which are adapted to engage a cap 13.
- the cap 13 has a plurality of apertures 14 to enable a number of electric heating elements to extend into the chamber 2 1 to heat the liquid.
- the body 11 is preferably moulded from polyethylene. More preferably the polyethylene is a randomly cross-linked polyethylene.
- polyethylene granules such as those marketed under the Registered Trade Mark of Sclair 8409 by DuPont, are ground to a suitable size and subjected to a cross-linking process, according to methods known in the art.
- the cross-linked polyethylene is then moulded, preferably by a rotation moulding process to form the container.
- the cross-linked polyethylene exhibits superior properties when subjected to continuous heat and pressure, and generally, such properties are concomitant with the degree of cross-linking. Accordingly, it is preferred that a degree of at least 25% cross-linking is attained. More preferably the containers are moulded from a 50-100% cross-linked polyethylene. Suitable adjuvants known to those skilled in the art may be used in the polyethylene. For example, before grinding the polyethylene, the granules may be extended in extruded admixture with carbon black to yield a black polymer.
- the cap 13 is also formed of plastics material and is formed so as to have hollow portions 22 which are filled with an expanded foam to provide the cap 13 with strengths to withstand the heat and pressure within the chamber 21.
- a cover 12 Located above the cap 13 and resiliently biased so as to engage the cap 13 is a cover 12 which defines a chamber 16 to receive electrical wiring and control circuitry.
- the cap 13 has an opening 17 to provide for electrical cabling to enter the chamber 16. Additionally,.the cap 13, by having a floor 15 provides for the location of generally U-shaped heating elements in any location pattern that may be required.
Abstract
A water heater for pools and spas, the heater including a hollow body of plastics material which is closed by a cap of plastics material, the cap having a plurality of passages which receive and support heating elements which project through the cap into the interior of the body.
Description
- The present invention relates to liquid heaters and more particularly but not exclusively to heaters for spa and swimming pools. The present heater is also applicable to the chemical industry.
- In the past, heaters in particular for spas and swimming pools, have not been specifically designed for that environment, and accordingly suffer from several disadvantages due to their expected working conditions. These disadvantages in particular include a short working life due to chemical attack, and loss of efficiency. Additionally these heaters have traditionally been complex in structure and correspondingly expensive to manufacture.
- It is an object of the present invention to overcome or substantially ameliorate the above disadvantages.
- There is disclosed herein a liquid heating device comprising:
- a vessel formed of plastics material and encompassing an open ended cavity to receive the liquid to be heated;
- a cap of plastics material releasably secured to said vessel so as to close the open end of said cavity, said cap having at least one passage extending through it to provide access to the interior of said vessel; and
- at least one heating element supported by said cap and extending through said passage so as to be located in said cavity to heat liquid located therein.
- A preferred form of the present invention will now be described by way of example with reference to the accompanying drawing, wherein there is schematically depicted a pool or spa heater.
- The
heater 10 has abody 11 defining a chamber 21 through which liquid, entering thebody 11 byinlet 19 and leaving viaoutlet 18, may be heated by electric heating elements (not depicted) extending into the chamber 21. Preferably the heating elements are covered by Teflon (Registered Trade Mark) or Fluron'.(Registered Trade Mark) so as to resist chemical attack. The top of thebody 11 is provided with anannular portion 20 having internal and external threads which are adapted to engage acap 13. Thecap 13 has a plurality ofapertures 14 to enable a number of electric heating elements to extend into the chamber 21 to heat the liquid. Thebody 11 is preferably moulded from polyethylene. More preferably the polyethylene is a randomly cross-linked polyethylene. - In a preferred form of the invention polyethylene granules, such as those marketed under the Registered Trade Mark of Sclair 8409 by DuPont, are ground to a suitable size and subjected to a cross-linking process, according to methods known in the art. The cross-linked polyethylene is then moulded, preferably by a rotation moulding process to form the container.
- It has been found that the cross-linked polyethylene exhibits superior properties when subjected to continuous heat and pressure, and generally, such properties are concomitant with the degree of cross-linking. Accordingly, it is preferred that a degree of at least 25% cross-linking is attained. More preferably the containers are moulded from a 50-100% cross-linked polyethylene. Suitable adjuvants known to those skilled in the art may be used in the polyethylene. For example, before grinding the polyethylene, the granules may be extended in extruded admixture with carbon black to yield a black polymer.
- The
cap 13 is also formed of plastics material and is formed so as to havehollow portions 22 which are filled with an expanded foam to provide thecap 13 with strengths to withstand the heat and pressure within the chamber 21. - Located above the
cap 13 and resiliently biased so as to engage thecap 13 is acover 12 which defines achamber 16 to receive electrical wiring and control circuitry. Thecap 13 has anopening 17 to provide for electrical cabling to enter thechamber 16. Additionally,.thecap 13, by having afloor 15 provides for the location of generally U-shaped heating elements in any location pattern that may be required.
Claims (6)
1. A liquid heating device comprising:
a vessel formed of plastics material and encompassing an open ended cavity to receive the liquid to be heated;
a cap of plastics material releasably secured to said vessel so as to close the open end of said cavity, said cap having at least one passage extending through it to provide access to the interior of said vessel; and
at least one heating element supported by said cap and extending through said passage so as to be located in said cavity to heat liquid located therein.
2. The device of claim 1, wherein said vessel has a lip defining the open end of said cavity, said lip being of annular configuration and being threaded, and said cap is provided with a thread adapted to correspond to the thread of said lip so that said cap is threadably secured to said vessel.
3. The device of claim 1, wherein said lip is of U-shaped longitudinal cross-section and is provided with an internal and external configuration and said cap has an annular cavity having internal and external threads adapted to threadably engage the threads of said vessel.
4. The device of any one of claims 1 to 3, wherein said cap is formed of a composite structure comprising a shell defining a plurality of cavities and an expanded foam material located in said enclosed cavities.
5. The device of claim 1, wherein said vessel and cap are moulded from a 25-30% cross-linked polyethylene.
6. A liquid heating device substantially as herein- herein described with reference to the acccompanying drawing.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPE349880 | 1980-05-12 | ||
AU3498/80 | 1980-05-12 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0040029A2 true EP0040029A2 (en) | 1981-11-18 |
EP0040029A3 EP0040029A3 (en) | 1981-12-30 |
Family
ID=3768524
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81301945A Withdrawn EP0040029A3 (en) | 1980-05-12 | 1981-05-01 | Liquid heater |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0040029A3 (en) |
JP (1) | JPS572950A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2136098A (en) * | 1983-03-04 | 1984-09-12 | Bryant & Sons Limited Barry | Hot water cylinders |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63196857U (en) * | 1987-06-10 | 1988-12-19 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1902877A (en) * | 1931-09-18 | 1933-03-28 | Walter J Baker | Electric fluid heater |
FR785808A (en) * | 1935-02-19 | 1935-08-20 | Instantaneous water heater avoiding mains returns to earth and water hammer | |
AU2952971A (en) * | 1970-06-01 | 1972-12-07 | Rheem Australia Pty. Limited | Improvements in water heaters |
DE2748009B2 (en) * | 1977-10-26 | 1979-08-30 | Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart | Plastic water container for a water heater |
US4185187A (en) * | 1977-08-17 | 1980-01-22 | Rogers David H | Electric water heating apparatus |
JPS55123945A (en) * | 1979-03-16 | 1980-09-24 | Matsushita Electric Ind Co Ltd | Electric water heater |
-
1981
- 1981-05-01 EP EP81301945A patent/EP0040029A3/en not_active Withdrawn
- 1981-05-08 JP JP6845281A patent/JPS572950A/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1902877A (en) * | 1931-09-18 | 1933-03-28 | Walter J Baker | Electric fluid heater |
FR785808A (en) * | 1935-02-19 | 1935-08-20 | Instantaneous water heater avoiding mains returns to earth and water hammer | |
AU2952971A (en) * | 1970-06-01 | 1972-12-07 | Rheem Australia Pty. Limited | Improvements in water heaters |
US4185187A (en) * | 1977-08-17 | 1980-01-22 | Rogers David H | Electric water heating apparatus |
DE2748009B2 (en) * | 1977-10-26 | 1979-08-30 | Bosch-Siemens Hausgeraete Gmbh, 7000 Stuttgart | Plastic water container for a water heater |
JPS55123945A (en) * | 1979-03-16 | 1980-09-24 | Matsushita Electric Ind Co Ltd | Electric water heater |
Non-Patent Citations (1)
Title |
---|
PATENTS ABSTRACTS OF JAPAN, Vol. 4, No. 176, 5 December 1980, page 658M45; & JP-A-55 123 945 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2136098A (en) * | 1983-03-04 | 1984-09-12 | Bryant & Sons Limited Barry | Hot water cylinders |
Also Published As
Publication number | Publication date |
---|---|
JPS572950A (en) | 1982-01-08 |
EP0040029A3 (en) | 1981-12-30 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LU NL SE |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB IT LU NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19821208 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: WILSON, GORDON KENNETH |