GB2112126A

GB2112126A - Camping stove

Info

Publication number: GB2112126A
Application number: GB08236531A
Authority: GB
Inventors: Carl-Anker Mejyr
Original assignee: PRIMUS SIEVERT AB
Current assignee: PRIMUS SIEVERT AB
Priority date: 1981-12-22
Filing date: 1982-12-22
Publication date: 1983-07-13
Also published as: FR2518711A1; GB2112126B; JPS58117929A; SE429139B; SE8107714L; FR2518711B3

Abstract

A camping stove for firing with condensed petroleum gas or similar fuel comprises at least one burner (7) with a flow regulation valve, a fuel container (3), and a pressure regulator (6) Fig. 1 (not shown) in a line between the fuel container (3) and the burner (7) for regulating the pressure of the fuel supplied to the burner. Heat transmission means (4, 13) are arranged with one portion (4) positioned in contact with the fuel container (3) and with another portion (13) positioned close to the burner (7), so that the quantity of heat transmitted from the flame of the burner (7) through the heat transmission means (4, 13) to the fuel container (3) substantially corresponds to the heat of vaporization of the amount of fuel consumed during the combustion. The outlet pressure of the pressure regulator (6) corresponds to the vapour pressure of the fuel gas at the lowest ambient temperature where the burner (7) is to give full effect. <IMAGE>

Description

SPECIFICATION Camping stove The present invention relates to a camping stove for firing with condensed petroleum gas or similar fuel, said stove comprising at least one burner with a flow regulation valve, a fuel container, and a pressure regulator in a line between the fuel container and the burner for regulating the pressure of the fuel supplied to the burner.

When condensed petroleum gas is used as fuel in a camping stove it is sometimes difficult to obtain a satisfactory cooking effect. This is particularly the case in respect of petroleum gases, the boiling point of which lies closely below the ambient temperature in which the stove is to be used; which means that e.g. butane has been considered unsuitable as a fuel for camping stoves which are to be used out-doors in the winter in countries having a temperate climate. When starting the stove there is sufficient gaspressure for full effect at most ambient temperates.

However, during use, the gaseous fuel in the fuel container is consumed, and this fuel has to be replaced through vaporization of the fuel in liquid phase, which means that a portion of the heat content of the liquid is used for this purpose. Thus, the temperature of the liquid drops below the ambient temperature, whereupon heat is supplied to the liquid from the outside through the wall of the container. For gases having a relatively high boiling point, e.g. butane, and with small gascontainers, which as usually the case in camping stoves, the energy supplied by convection from the surroundings is not sufficient for the vaporization, and so the container becomes constantly colder from continued loss of latent heat energy from the liquid, and therefore the gas pressure sinks and the effect of the stove becomes insufficient.

In order to eliminate the cooling of the fuel container it is possible to supply heat from the combustion to the container. This must be done in such a way, that the supplied heat is proportional to the current burner effect, as the need for vaporization heat is linearily dependent on the burner effect. Too small a supply of heat leads to decrease in effect, while too great supply of heat gives a rise in temperature resulting in an unallowable pressure increase in the fuel container.

An object of the present invention is to provide a store of the kind mentioned in the introduction, in which it is possible to obtain a supply of heat to the container which corresponds to the consumed vaporization heat, which means that the pressure in the fuel container is maintained substantially constant during the use of the stove.

According to the invention there is provided a camping stove for fitting with condensed petroleum gas or similar fuel, said stove comprising at least one burner with a flow regulation valve, a fuel container, and a pressure regulator connected in a line between the fuel container and the burner for regulating the pressure of the fuel supplied to the burner, wherein a heat transmission means is arranged with one portion positioned in contact with the fuel container and with another portion positioned .close to the burner, so that the quantity of heat transmitted from the flame of the burner through the heat transmission means to the fuel container substantially corresponds to the heat of vaporization of the amount of fuel consumed during combustion, and the outlet of the pressure regulator corresponds to the vapour pressure of the fuel gas at the lowest ambient temperature where the burner is to give full effect.

An embodiment of the invention is described by way of example, below with reference to the accompanying drawing, in which Fig. 1 is a plan view from above, partially broken away, of a camping stove according to one embodiment of the invention, and Fig. 2 shows a section along the line Il-Il in Fig. 1.

A camping stove is shown in the drawing, having a housing 1 of sheet metal which is formed in several mutually connected portions and is provided with a bottom 2. The housing 1 and the bottom 2 are intended to support all other elements of the stove.

The fuel for the stove is stored in a fuel container 3, which is inserted through an opening in the bottom 2 and is threaded on to an attachment means 4, from which a line 5 extends to a pressure regulator 6. From the pressure regulator a line (not shown) extends to a burner 7, and in this line a flow regulation valve (not shown) is arranged, this valve being controlable by means of knob 8. In the stove shown in the drawing, a lighting device 9 of piezo-electric type is also provided, this lighting device being actuated by an actuation button 1 0. Further, the housing 1 is, in a known manner, provided with a number of air openings 11 and with apertures 12 for mounting a wind protection means (not shown) with a stand for, for example cooking utensils or the like.

The attachment means 4 is made of a metal having good heat conducting ability, e.g. brass or the like, and is made integrally with or is connected to a body 1 3 which projects upwardly through the housing 1. This body 1 3 together with the attachment means 4 constitute a heat transmission means for transmitting heat from the flame of the burner 7 to the fuel container 3. The body 1 3 has such dimensions and is so located in relation to the burner 7 and the flame of the burner, that the amount of heat transmitted from the flame through the body 13 and the attachment means 4 to the fuel container 3 when the burner 7 is operating, substantially corresponds to the vaporization heat for the amount of fuel consumed during combustion.

Further, the output pressure of the pressure regulator 6 is so adjusted, that it corresponds to the vapour pressure of the fuel gas at the lowest ambient temperature at which the burner 7 is to give full effect. This is necessary in order to make it possible to control the effect of the burner and the supply of heat to the fuel container 3 when operating in different ambient temperatures, as the pressure in the fuel container 3 is strongly dependent on the ambient temperature. The output pressure of the pressure regulator 6 should therefore be adjusted as low as possible, and the burner should be dimensioned for this pressure, as the burner would otherwise have a much reduced effect when operating at low ambient temperatures.

Claims

1. A camping stove for firing with condensed petroleum gas or similar fuel, said stove comprising at least one burner with a flow regulation valve, a fuel container, and a pressure regulator connected in a line between the fuel container and the burner for regulating the pressure of the fuel supplied to the burner, wherein a heat transmission means is arranged with one portion positioned in contact with the fuel container and with another portion positioned close to the burner, so that the quantity of heat transmitted from the flame of the burner through the heat transmission means to the fuel container substantially corresponds to the heat of vaporization of the amount of fuel consumed during combustion, and the outlet pressure of the pressure regulator corresponds to the vapor pressure of the fuel gas at the lowest ambient temperature where the burner is to give full effect.

2. A stove according to claim 1, wherein the heat transmission means includes a substantially solid body of heat conducting material.

3. A stove according to claim 2, wherein said heat conducting material is a metal.

4. A stove according to claim 2, wherein said heat conducting material is a metal alloy.

5. A camping stove substantially as herein described with reference to the accompany drawings.