EP0909934A2 - Method for cleaning water heating elements, in particular armoured resistance elements - Google Patents
Method for cleaning water heating elements, in particular armoured resistance elements Download PDFInfo
- Publication number
- EP0909934A2 EP0909934A2 EP98119206A EP98119206A EP0909934A2 EP 0909934 A2 EP0909934 A2 EP 0909934A2 EP 98119206 A EP98119206 A EP 98119206A EP 98119206 A EP98119206 A EP 98119206A EP 0909934 A2 EP0909934 A2 EP 0909934A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- elements
- water heating
- cleaning
- cleaning water
- heating elements
- 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- Withdrawn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
- 238000004140 cleaning Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 8
- 238000010438 heat treatment Methods 0.000 title claims abstract description 6
- 238000005299 abrasion Methods 0.000 claims abstract 2
- 239000000835 fiber Substances 0.000 claims description 2
- 235000013311 vegetables Nutrition 0.000 claims description 2
- 238000005498 polishing Methods 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G3/00—Rotary appliances
- F28G3/04—Rotary appliances having brushes
-
- 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
- F24H9/0005—Details for water heaters
- F24H9/0042—Cleaning arrangements
Definitions
- This invention relates to a method for cleaning water heating elements, in particular armoured resistance elements.
- Water heating elements consisting substantially of a steel sheath internally housing a resistive wire separated from the sheath by a dielectric substance, in particular magnesium oxide.
- the sheath In order to free the surface of the sheath from oxidation and irregularities which could allow the detergent and lime to accumulate with resultant corrosion, the sheath is subjected to finishing treatment generally consisting of polishing in an electrolytic bath.
- the resistance element is washed with hot water, possibly slightly alkaline, to neutralize the residual bath acids.
- An object of the invention is to eliminate these drawbacks by providing a method which enables the resistance element to be cleaned in a completely automated manner, is of high productivity and low cost, requires little maintenance, and suffers from no ecological problems.
- the plant for implementing the method of the invention comprises substantially a loading hopper 2 housing the individual resistance elements 4 already assembled, ie with the resistive wire inserted into the sheath and separated therefrom by dielectric material, for example magnesium oxide.
- a conveyor 6 for conveying the individual resistance elements to a cleaning station 8 and a polishing station 10.
- the conveyor exit is connected to a discharge hopper 12.
- the cleaning station 8 and polishing station 10 comprise two chucks 14 for locking the resistance element and two vegetable fibre brushes 16 of horizontal axis, each of which is faced by a cake of abrasive paste.
- the brushes are mounted on a traversable frame 20.
- an individual resistance element 4 is discharged by the loading hopper 2 onto the conveyor 6 to be fed to the cleaning station 8, where it is locked by the locking chucks 14.
- the brushes 16 are operated so that as a result of their rotation the fibres pick up abrasive paste while at the same time mechanically cleaning the resistance element.
- the brushes are made to traverse along their axis so as to clean the entire resistance element.
- the resistance element is then conveyed to the polishing station where the aforedescribed operations are effected. After cleaning, the resistance element is fed to the discharge hopper 12.
- the described example relates to a plant operating automatically on a straight resistance element.
- the method can however also be carried out manually, ie by subjecting the individual resistance elements to a manual mechanical cleaning operation. It can also be used manually or automatically on an already completed resistance element.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Cleaning In General (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Bidet-Like Cleaning Device And Other Flush Toilet Accessories (AREA)
- Resistance Heating (AREA)
Abstract
A method for cleaning water heating elements, in particular armoured
resistance elements (4), characterised in that the cleaning is carried out by
mechanical abrasion.
Description
This invention relates to a method for cleaning water heating
elements, in particular armoured resistance elements.
Water heating elements are known consisting substantially of a steel
sheath internally housing a resistive wire separated from the sheath by a
dielectric substance, in particular magnesium oxide.
In order to free the surface of the sheath from oxidation and
irregularities which could allow the detergent and lime to accumulate with
resultant corrosion, the sheath is subjected to finishing treatment generally
consisting of polishing in an electrolytic bath.
After the electrolytic bath the resistance element is washed with hot
water, possibly slightly alkaline, to neutralize the residual bath acids.
This cleaning method has however certain drawbacks, namely:
- high cost due to the provision of the electrolytic plant itself and the need to provide a wash water purification plant and a bath liquid disposal plant,
- low productivity,
- laborious preparation of the resistance element for the electrocleaning, requiring precleaning and degreasing of any fingerprints which, following electrocleaning, would be highlighted and indelibly impressed on the resistance element,
- incomplete cleaning as the sheath requires protection of its ends, which hence remain uncleaned.
An object of the invention is to eliminate these drawbacks by providing
a method which enables the resistance element to be cleaned in a completely
automated manner, is of high productivity and low cost, requires little
maintenance, and suffers from no ecological problems.
This and further objects which will be apparent from the ensuing
description are attained by a cleaning method for water heating elements, in
particular armoured resistance elements as described in claim 1.
The invention is further clarified hereinafter with reference to the
accompanying drawing showing a schematic plan view of a plant for
implementing the method of the invention.
As can be seen from the figure the plant for implementing the method
of the invention comprises substantially a loading hopper 2 housing the
individual resistance elements 4 already assembled, ie with the resistive wire
inserted into the sheath and separated therefrom by dielectric material, for
example magnesium oxide. Starting from the loading hopper there is a
conveyor 6 for conveying the individual resistance elements to a cleaning
station 8 and a polishing station 10. The conveyor exit is connected to a
discharge hopper 12.
The cleaning station 8 and polishing station 10 comprise two chucks
14 for locking the resistance element and two vegetable fibre brushes 16 of
horizontal axis, each of which is faced by a cake of abrasive paste.
The brushes are mounted on a traversable frame 20.
According to the method of the invention, an individual resistance
element 4 is discharged by the loading hopper 2 onto the conveyor 6 to be fed
to the cleaning station 8, where it is locked by the locking chucks 14. At the
same time the brushes 16 are operated so that as a result of their rotation the
fibres pick up abrasive paste while at the same time mechanically cleaning the
resistance element. During this stage the brushes are made to traverse along
their axis so as to clean the entire resistance element. The resistance element
is then conveyed to the polishing station where the aforedescribed operations
are effected. After cleaning, the resistance element is fed to the discharge
hopper 12.
From the aforegoing it is apparent that the cleaning method of the
invention presents numerous advantages, and in particular:
- it is lower cost than the electrocleaning plant,
- there are no environmental pollution problems, as the solid residues are discharged as solid urban refuse,
- it enables reliable finishing to be achieved by the use of synthetic fibres and abrasive material which is continuously replaced,
- it is suitable for automation, with consequent high productivity.
The described example relates to a plant operating automatically on a
straight resistance element. The method can however also be carried out
manually, ie by subjecting the individual resistance elements to a manual
mechanical cleaning operation. It can also be used manually or automatically
on an already completed resistance element.
Claims (3)
- A method for cleaning water heating elements, in particular armoured resistance elements, characterised in that the cleaning is carried out by mechanical abrasion.
- A method as claimed in claim 1, characterised in that the cleaning is carried out with rotating brushes of vegetable fibre.
- A method as claimed in claim 1, characterised in that the rotating brushes are faced by a cake of abrasive paste.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITVE970045 | 1997-10-17 | ||
| IT97VE000045A IT1297494B1 (en) | 1997-10-17 | 1997-10-17 | CLEANING PROCEDURE FOR WATER HEATING ELEMENTS, IN PARTICULAR ARMORED RESISTORS. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0909934A2 true EP0909934A2 (en) | 1999-04-21 |
| EP0909934A3 EP0909934A3 (en) | 2000-05-31 |
Family
ID=11424315
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98119206A Withdrawn EP0909934A3 (en) | 1997-10-17 | 1998-10-12 | Method for cleaning water heating elements, in particular armoured resistance elements |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0909934A3 (en) |
| IT (1) | IT1297494B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352540A (en) * | 2015-07-21 | 2017-01-25 | 中山市元亨家居用品有限公司 | Water heater with self-cleaning function |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE204479C (en) * | ||||
| SE8800882L (en) * | 1988-03-11 | 1989-09-12 | Sical Ab | PROCEDURE AND DEVICE FOR EXPLORING HEATING ENERGY FROM POLLUTANEATED WATER |
| FR2655886B1 (en) * | 1989-12-20 | 1996-06-14 | Stein Industrie | APPARATUS FOR CLEANING THE EXTERNAL AND POSSIBLY INTERNAL SURFACES OF LOW DIAMETER TUBES. |
| JPH0824951B2 (en) * | 1991-12-12 | 1996-03-13 | 日本軽金属株式会社 | Hot rolling method for aluminum slabs |
-
1997
- 1997-10-17 IT IT97VE000045A patent/IT1297494B1/en active IP Right Grant
-
1998
- 1998-10-12 EP EP98119206A patent/EP0909934A3/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106352540A (en) * | 2015-07-21 | 2017-01-25 | 中山市元亨家居用品有限公司 | Water heater with self-cleaning function |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1297494B1 (en) | 1999-12-17 |
| EP0909934A3 (en) | 2000-05-31 |
| ITVE970045A0 (en) | 1997-10-17 |
| ITVE970045A1 (en) | 1999-04-17 |
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