JPH04218118A - Alcohol cooker - Google Patents

Abstract

PURPOSE: To provide a cooking stove for use of alcohol operated with hidden flames, reducing the danger to cause a fire on peripheral articles, eliminating the generation of the soot on a pot, using the energy contained in flames and smoke as effectively as possible, preventing the occurrence of an odor, and avoiding a complicating means. CONSTITUTION: This cooking stove for use of alcohol has an apex 11 provided with at least a hot plate 15 made of a heat-conductive material, and the hot plate 15 is connected to the apex 11. The cooking stove for use of alcohol is provided with an alcohol burner arranged below the hot plate 15, air flows to it, and smoke is released by natural circulation from here. The hot plate 15 is surrounded by a heat insulating material having a surface exposed to flames and smoke or one of them.

Description

[Detailed description of the invention]

[0001] This invention relates to an alcohol stove.

Such stoves are already known and are preferably used in yachts and caravans as camping stoves, but also for other purposes where electricity and LB gas are not available or are unsuitable for other reasons. used for. There are two types of burners for such stoves:
A pressure burner is a burner that distributes pressurized fuel into several burner nozzles; in pressureless burners, the fuel evaporates and burns from the free surface of the fuel container. The latter type of burner is of very simple construction and is widely used, and the present invention relates to such a burner.

A disadvantage of the last-mentioned type of burner is that it produces a relatively high open flame. Apart from the risk of fire, the presence of a flame does not allow the available heat energy to be used particularly effectively, since wasted heat escapes from the pot placed above the flame. In order to reduce the above-mentioned disadvantages, it is common to place a flame spreader formed as a perforated or non-perforated shield above the burner, so that the flame spreads over several Divided into small flames, this also means good air supply to the combustion process. However, this arrangement does not change the situation regarding thermal energy losses due to wasted heat. Another disadvantage is that the pot used becomes covered with soot from the flame.

It is also known to use camping stoves which operate without an open flame, thus eliminating the problem of being covered with soot. In such stoves, LP gas or paraffin is burned below the ceramic top on which the pot rests. These stoves are complex because they require pumps, fixed equipment, etc. to perform the job correctly.

Furthermore, there are camping stoves, which are a combination of an alcohol burner and an electrically heated stove with a top, the top of which is electrically heated and exposes an ordinary alcohol stove. It can be folded. These stoves are complex and expensive.

[0006] The object of the invention is to operate with a concealed flame;
To construct a simple alcohol stove, which thereby reduces the risk of causing fire to surrounding objects and eliminates the formation of soot on the pot, and to preserve as much as possible the energy content of the flame and fumes; It is in. Alcohol stoves also have a design that primarily produces no odor during the combustion of alcohol. Furthermore, alcohol stoves operate with natural draft, without the need for complex measures for directing fuel or air to the burners or for removing fumes from the burners.

Therefore, according to the present invention, at least 1
An alcohol stove having a top with two hot plates of thermally conductive material, the hot plate being arranged such that the hot plate joins the top, the stove having an alcohol burner and an alcohol a burner is disposed below the hot plate, air flows toward the alcohol burner, fumes are directed away from the alcohol burner by natural draft, and the hot plate has a surface exposed to the flame and/or fumes; An alcohol stove is provided, characterized in that it is surrounded by a thermally insulating material.

Preferably, an insulating material at least partially surrounds the fume, and the insulating material forms a passageway for directing the fume to an outlet spaced from the hot plate.

Preferably, there is a means below the hot plate for increasing the flow path of the fumes on the bottom side of the hot plate.

Preferably, said means consist of a flange that is at least partially arcuate in top view.

Preferably, an outlet for the fume is located at the trailing edge of the top.

[0012] Preferably, the hot plate has an electric heating coil on its bottom side.

Preferably, an electric heating coil is located one distance from the bottom side of the hot plate.

Preferably, the top portion is made of stainless steel.

Preferably, spark generating means accessible from the outside of the stove are arranged in conjunction with a fuel container which is part of the burner.

Preferably, the spark generating means comprises a notched wheel and a pin in contact with the notched wheel.

[0017]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The drawing shows an alcohol stove for two hot plates which can differ from each other in terms of dimensions, the hot plates being arranged on each side of the vertical center line in FIG. However, the invention can be used with any number of hot plates. As can be seen in the drawing, the stove has a box-shaped metal shell 10, the upper part of which is a top 11 with a high edge part 12 and a low central part 13. The top part, which is preferably made of stainless steel but can also be made of other materials such as ceramic material, glass, has an opening 14 for a hot plate 15, which has a ring 1 of steel.
6 is tightened to the top. The hot plate is made of a thermally conductive material, for example cast iron, and has a protruding flange 1 on the bottom side.
7, which, viewed in top view, is U-shaped and oriented with the open part facing forward. The bottom side also comprises an electric coil 18, which is connected to an electric circuit (not shown) in the stove so as to be supplied by a power source. Between the front wall 19 and the rear wall 20 of the outer shell 10, two profiles 21 and 22 are provided which serve as support for an insulating insert 23. This insert has two side walls 24, 2
5, a front wall 26, a rear wall 27 and a roof portion 28, which surrounds a ring-shaped, downwardly extending outer flange 29 of the hot plate 15. The insert further has a rear opening 30 located below several exit openings 31 in the trailing edge portion of the top.

The stove furthermore has a horizontal heat protection plate 32, below which is a fuel container 33 for alcohol.
is placed. The fuel container conventionally has a closed circular metal shell surrounding the liquid absorbent. The upper central part of the container, surrounded by the ring-shaped flange 34, is open, so that the liquid absorbent which has absorbed the alcohol is not covered. The flange 34 extends through a circular aperture in the thermal protection plate 32, and the thermal protection plate abuts the outer periphery of the flange.

A ring 35 is fixed concentrically with the flange 34 along the heat protection plate 32, and this ring is attached to the burner tube 3.
supporting part of the burner consisting of a holder 36 with 7. This holder consists of three S-shaped tongues attached to a ring 35, which are joined in their upper part to the vertically oriented burner tube. The burner tube 37 supports a flame expanding member 38 by a U-shaped metal plate 39 fastened to its upper portion. The flame expansion member is arranged below the hot plate 15 and directly above the opening 40 of the burner tube and is formed as a hat and has a lip 41
The upper part of the hat has several apertures 42 through which the flame spreads below the hot plate.

The alcohol stove has a door 4 on its front wall 19.
3 through which the fuel container can be removed for filling. The container has a shaped member 4 fastened to an outer shell 10.
4, this shaped member 44 has a rear bend 46, a front projection 47 and a front bend 48.
The rear bent portion 46 and the projection 47 are a stop means for the container 33, so that it can be clamped to the metal plate 45. The front bend 48 serves as a handle, by means of which the metal plate 45 and thus the container can be removed from the stove. The metal plate is guided by a yoke-shaped holder 49 clamped to the bottom of the outer shell 10.

The ring-shaped flange 34 of the container supports a circular control fire plate 50, which has a diameter slightly larger than the outer diameter of the flange 34. The plate 50 has an angle 51 which is angular in shape when viewed from the top surface and is fastened to the plate at the center.
can be continuously moved from a position in which it completely covers the opening in the ring-shaped flange 34 to a position in which it does not completely cover this opening. This allows the board to
It is moved laterally between two tongues belonging to the retainer 36. The arm 51 is clamped for rotational movement about a vertical axis 52 clamped to the front part of the thermal protection plate and has a front end 53 cooperating with a control lever formed as a rod 54, which rod 54 is It comprises control means 55 arranged on the edge section 12 of the top 11, which can be moved manually along the front edge of the stove. Since the control means is rotatably and slidably fixed to the flange 56 in the front part of the stove, movement of the control means 55 causes a corresponding rotational movement of the fire extinguishing plate 50.

The stove also has an igniter, which constitutes a knob 57 on its front wall, which is connected to the horizontal sleeve 5.
It is fixed to an axle 58 rotatably supported in the burner tube 9, which axle supports a notched wheel 60 at the burner tube. The spark generating pin 61 is connected to a spring (
(not shown) towards the wheel, the tube and shaft being supported by a bracket 63 fixed to the holder 36.

Above the door 43, on the front side of the stove, there are several air inlet openings 64.

The alcohol stove is operated as follows. If fuel is present in container 33, this fuel can be ignited by rotating knob 57. A spark is generated by the movement between the notched wheel 60 and the pin 61. If the extinguishing plate were to be displaced by the control means 55, the spark would reach into the opening in the annular flange 34 of the container 33. The fuel is ignited, which causes
Combustion air is drawn through the opening 64 and through the retainer 36 into the burner tube 37 , which causes a flame to blow up through the aperture 42 in the flame spreader 38 . At the same time, secondary air freely enters all parts of the flame around the burner tube 37 through the air inlet opening 64 and between the flame expansion member 38 and the hot plate 15 or the insert 23. By acting on the control means 55, the size of the flame can be controlled. Due to the presence of flange 17, the hot fumes are first directed forwardly below hot plate 15 and then deflected backwards around the leading edge of flange 17 and around the outside of flange 17 and flange 29 and insert 2
3 towards the trailing edge of the hot plate where the fumes leave through an opening 30 in the insert and through an exit opening 31 at the top. The purpose of the insert 23 is to prevent heat from the flame from transferring to the top and concentrate the thermal energy from the flame to the hot plate. As will be apparent, when the thermal insulation material in the insert reaches a certain temperature and the heat transfer between the flame and the surrounding insert is reduced, the flame will be deflected towards the bottom side of the hot plate. , which increases the heat exchange with this.

[Brief explanation of the drawing]

FIG. 1 is a front view and a vertical sectional view of an alcohol stove according to the present invention.

FIG. 2 is a vertical sectional view taken along line III-III in FIG. 1;

[Explanation of symbols]

11 Top 15 Hot plate 17 Flange 18 Electric heating coil 23 Insulating material 33, 36, 37, 38 Alcohol burner 60
Wheel 61 pin

Claims (10)

[Claims] 1. An alcohol hob having a top (11) with at least one hotplate (15) of thermally conductive material, the hotplate being arranged in such a way that the hotplate joins the top. In this case, this stove is
It has alcohol burners (33, 36, 37, 38),
An alcohol burner is disposed below the hot plate, air is directed toward the alcohol burner, fumes are directed away from the alcohol burner by natural draft, and the hot plate has a surface exposed to the flame and/or fume. An alcohol stove characterized by being surrounded by a heat insulating material (23). 2. An insulating material (23) at least partially surrounding the fume, said insulating material forming a passageway directing the fume to an outlet (31) arranged at a distance from the hot plate. The alcohol stove described in 1. 3. An alcohol stove according to claim 1, wherein means for increasing the flow path of the smoke on the bottom side of the hot plate is located below the hot plate. 4. Alcohol stove according to claim 3, wherein said means consist of a flange (17) which is at least partially arcuate in top view. 5. The outlet (31) for the fumes is located at the top (
11) The alcohol stove according to any one of claims 2 to 4, which is arranged at the trailing edge of the alcohol stove. 6. Alcohol stove according to claim 1, wherein the hot plate (15) has an electric heating coil (18) on its bottom side. [Claim 7] The electric heating coil is connected to a hot plate (15
7. An alcohol stove according to claim 6, wherein the alcohol stove is located one distance from the bottom side of the stove. 8. An alcohol stove according to claim 1, wherein the top (11) is made of stainless steel. 9. Alcohol stove according to claim 1, characterized in that the spark generating means accessible from the outside of the stove are arranged in connection with a fuel container (33) which is part of the burner. reactor. 10. The spark generating means comprises a notched wheel (60
) and a pin (61) in contact with the alcohol stove according to claim 9.