EP0048547A2 - Improvements in or relating to feed devices - Google Patents
Improvements in or relating to feed devices Download PDFInfo
- Publication number
- EP0048547A2 EP0048547A2 EP81303748A EP81303748A EP0048547A2 EP 0048547 A2 EP0048547 A2 EP 0048547A2 EP 81303748 A EP81303748 A EP 81303748A EP 81303748 A EP81303748 A EP 81303748A EP 0048547 A2 EP0048547 A2 EP 0048547A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate
- feed device
- hopper
- series
- angle
- 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- Withdrawn
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
- F24B13/00—Details solely applicable to stoves or ranges burning solid fuels
- F24B13/04—Arrangements for feeding solid fuel, e.g. hoppers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/54—Gates or closures
- B65D90/62—Gates or closures having closure members movable out of the plane of the opening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/16—Over-feed arrangements
- F23K3/18—Spreader stokers
Definitions
- This invention concerns improvements in or relating to feed devices for use particularly although not exclusively in solid fuel domestic combustion.appliances.
- An object of the invention is therefore to provide an improved feed device.
- the angular orientation of the hopper walls is advantageously of the order of 35° to 45 0 to the horizontal.
- the feed device of the present invention is particularly applicable to a domestic combustion appliance in which an incremental feed of solid fuel is required.
- the intermittent or continuous actuation of the motor to move the plate provides the desired feed characteristic at low cost and automatically and the spreader device provides an even firebed.
- the dimensions given herein are especially suitable for feeding doubles size coal, but may be altered according to the material to be fed.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
Abstract
A feed device (1) for solid fuel domestic appliances comprises a hopper (2) with downwardly inclined sides (3) defining a discharge slot (4) beneath which is located a flat plate (6) in spaced relation thereto. The plate (6) is mounted on a central pivot (7) and is movable thereabout by a suitable low power low speed drive (5). A spreader device comprising two series of inclined spaced apart metal strips (8) is located below the plate (6). Fuel held within the hopper (2) flows out onto the plate (6) and assumes a natural angle of repose when the plate (6) is horizontal. Upon small angular movement of the plate (6), fuel is caused to flow off the plate (6) which in use is disposed evenly over a fire bed by the spreader device.
Description
- This invention concerns improvements in or relating to feed devices for use particularly although not exclusively in solid fuel domestic combustion.appliances.
- One of the needs especially in modern times is for a means of automatically feeding solid fuel onto the firebed of a solid fuel burning appliances, thereby obviating the need for manual operation. It is desirable to provide a system giving incremental feed.to maintain the correct combustion rate and thus output.
- Various suggestions have been made in an endeavour to meet this need. For example rotary valves or sliding plates have been proposed but these suffer from the disadvantages of high power consumption for the drive motors and they both involve a shearing or crushing action on the fuel. Particularly for the domestic market, low power, low cost mechanisms are required.
- One of our earlier inventions described and claimed in GBPA 2 011 065 is directed to the use of a paddle wheel rotor which found successful application when used for singles size coal as it did not involve shearing of the fuel. However it provided a batch feed and attempts to modify this system to give an incremental feed were unsuccessful. Also for larger sized fuel, for example doubles, the dimensions of the paddle wheel would become too great to accommodate within the confines of a domestic appliance.
- An object of the invention is therefore to provide an improved feed device.
- Accordingly the invention provides a feed device including in combination a hopper with at least two inclined bounding walls leading at relatively lower ends thereof to a discharge outlet, a plate disposed beneath the outlet at such a distance therefrom as to allow in use material from the hopper to assume a natural angle of repose, and means for moving the plate such that in use upon movement of the plate material is caused to discharge from the plate.
- The plate is preferably flat or substantially flat and is wider than the discharge outlet of the hopper.
- The plate is conveniently mounted on a central pivot, movement about the pivot in either direction in use occasioning the discharge of material from the plate.
- The means for moving the plate may advantageously be a small slow speed motor, conveniently electrical, which is coupled via a crank arrangement to the pivot of the plate, thereby in use giving a small angular movement of the plate. The degree of angular movement is conveniently of the order of 2° to 7°.
- Alternatively, the means for moving the plate comprises a vibrator for transmitting intermittent vibrations to the plate thereby upsetting in use the natural angle of repose of material resting on the plate.
- The angular orientation of the hopper walls is advantageously of the order of 35° to 450 to the horizontal.
- operation of this device will give an incremental feed of material from the hopper. However, in the case of a coal burning appliance, it is desirable in some cases to distribute the fed material evenly onto a firebed. This cannot be achieved by the device, which will discharge the coal onto the firebed into two piles. To avoid this problem, where necessary, the device may also include a spreader device located below the plate. Conveniently the spreader device comprises two series of spaced apart metal strips, each series being for location adjacent one edge of the plate at an angle of about 250 to the horizontal such that a proportion of the material discharged from the plate is deflected below the plate.
- The present invention is preferably directed to a feed device for feeding solid fuel to a combustion appliance and a further aspect of the invention is directed to a solid fuel combustion appliance incorporating such a feed device.
- By way of example, one form of feed device according to the invention is described below with reference to the accompanying drawings in which:-
- Figure 1 diagrammatically illustrates the invention in cross section; and
- Figure 2 is a plan view along the line A-A of Figure 1.
- Referring to the drawings, a feed device 1 comprises a hopper 2 having at least two
lower sides 3 inclined downwards a discharge outlet in the form of a slot 4. The angle of inclination of thesides 3 is in this example 400 as a preference. It has been found by experiment that the width of the slot 4 should be of the order of 120 mm in order to feed doubles size coal efficiently, there being no upper limit. - A
flat plate 6 is located directly beneath the slot 4 at a minimum distance, in this embodiment of 95 mm, and is mounted at its centre on apivot 7. The minimum width of theplate 6 in this example is 256 mm. The combination of these dimensions ensures that in use material, for example solid fuel, in the hopper 2 flows out of slot 4 and assumes a natural angle of repose on theplate 6 when in a horizontal position at which no discharge therefrom occurs.. - A low power slow speed
electric motor 5 is provided and is coupled to thepivot 7 to impart a slow oscillatory motion to theplate 6. An angular movement either side of the horizontal neutral position of up to 70 has been found to give a discharge of material, for example fuel, from the plate in increments. It has also been determined by experiment that a motor speed of less than 1 rpm and an angular movement in either direction of 6° gives a good result. At motor speeds of between 1 rpm and 5 rpm and anangle 3°, good results have also been obtained. - Mounted below the
plate 6 is a spreader device 9 comprising two series of spaced apartmetal strips 8. Each series of strips slopes at an angle of about 200 to the horizontal towards the centre of the device, their lower ends being located adjacent one edge ofplate 6. In this instance, the strips are 25 mm wide and spaced 40 mm apart. The distance between the lower ends of the series of strips is 330 mm and the vertical distance from theplate 6, when horizontal, to the lower end of thestrips 8 is 92 mm. As the material discharges from theplate 6 it falls onto one of the series of strips-8. A proportion of the material is deflected by the strips to below theplate 6, and the rest falls through to spaces between thestrips 8, thus producing an even bed of material. - The feed device of the present invention is particularly applicable to a domestic combustion appliance in which an incremental feed of solid fuel is required. The intermittent or continuous actuation of the motor to move the plate provides the desired feed characteristic at low cost and automatically and the spreader device provides an even firebed. The dimensions given herein are especially suitable for feeding doubles size coal, but may be altered according to the material to be fed.
Claims (10)
1. A feed device includes in combination a hopper with at least two inclined bounding walls leading at relatively lower ends thereof to a discharge outlet, characterised by a plate (6) disposed beneath the outlet (4) at such a distance therefrom as to allow in use material from the hopper (2) to assume a natural angle of repose, and means (5) for moving the plate such that in use upon movement of the plate material is caused to discharge from the plate.
2. A feed device according to claim 1 characterised in that the plate (6) is flat or substantially flat and is wider than the discharge outlet (4) of the hopper.
3. A feed device according to claim 1 of 2 characterised in that the plate (6) is mounted on a central pivot (7).
4. A feed device according to any one of the preceding claims characterised in that the means for moving the plate (6) is a low speed power electrical motor (5).
5. A feed device according to claim 4 as dependent on claim 3 characterised in that the motor (5) is coupled to the pivot (7) to give bi-directional angular movement to the plate (6).
6. A feed device according to claim 5 characterised in that the angular movement in either direction is in the range 2° to 70.
7. A feed device according to any one of the preceding claims characterised in that the angular inclination of the walls (3) is in the range 35° to 45°.
8. A feed device according to any one of the preceding claims and further characterised by a spreader device (9) located below the plate (6).
9. A feed device according to claim 8, characterised in that the spreader device (9) comprises two series of spaced apart metal strips (8), each series being provided for location adjacent one edge of the plate (6) at an angle to the horizontal such that a proportion of the material discharged from the plate (6) is deflected below the plate (6).
10. A feed device according to claim 9 characterised in that the angle is approximately 25°.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8030355 | 1980-09-19 | ||
GB8030355A GB2084313A (en) | 1980-09-19 | 1980-09-19 | Improvements in or relating to feed devices |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0048547A2 true EP0048547A2 (en) | 1982-03-31 |
EP0048547A3 EP0048547A3 (en) | 1982-05-12 |
Family
ID=10516172
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81303748A Withdrawn EP0048547A3 (en) | 1980-09-19 | 1981-08-18 | Improvements in or relating to feed devices |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0048547A3 (en) |
GB (1) | GB2084313A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE611115C (en) * | 1933-02-09 | 1935-03-22 | Hoesch Koeln Neuessen Akt Ges | Distributor for the loading material of shaft ovens, generators, shaft-like devices and containers |
GB2011065A (en) * | 1977-12-19 | 1979-07-04 | Coal Industry Patents Ltd | Hopper fed solid fuel stove. |
-
1980
- 1980-09-19 GB GB8030355A patent/GB2084313A/en not_active Withdrawn
-
1981
- 1981-08-18 EP EP81303748A patent/EP0048547A3/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE611115C (en) * | 1933-02-09 | 1935-03-22 | Hoesch Koeln Neuessen Akt Ges | Distributor for the loading material of shaft ovens, generators, shaft-like devices and containers |
GB2011065A (en) * | 1977-12-19 | 1979-07-04 | Coal Industry Patents Ltd | Hopper fed solid fuel stove. |
Also Published As
Publication number | Publication date |
---|---|
GB2084313A (en) | 1982-04-07 |
EP0048547A3 (en) | 1982-05-12 |
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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 DE FR SE |
|
AK | Designated contracting states |
Designated state(s): AT DE FR SE |
|
17P | Request for examination filed |
Effective date: 19820525 |
|
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: 19831121 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ETHERIDGE, ROBERT JAMES Inventor name: LAKE, JOHN MICHAEL |