FR2672787A1 - Portable cooking stove - Google Patents

Abstract

The invention relates to a portable liquid fuel cooking stove, characterized in that it comprises a cooking station (10) provided with a low pressure vaporization chamber (13) heated by the heat given off by the combustion zone, a supply circuit communicating with a reservoir mechanically pressurized by the force to return to its rest position of a device comprising one or more springs tensioned or compressed manually. Application to food reheating.

Description

PORTABLE COOKING STOVE
The invention relates to a portable cooking stove, in particular for reheating food.

 A stove of the kind thus defined must be as light and small as possible in order to correspond to current operational needs (mobility, lightness) and modern feeding techniques (freezing, freeze-drying), while being usable for a community. At the same time, the stove must be independent of an external source of energy, so that it can be put into service in any desired location.

 There are autonomous stoves from an energy point of view, but these run on petrol and are heavy and bulky.

 The invention aims to provide a portable stove of the kind defined in the preamble which, with small dimensions and low weight, can be used without external input of energy other than fuel. This object is achieved according to the invention by the fact that there is provided a cooking station provided with a vaporization chamber of the low-pressure liquid fuel heated by the heat released by the combustion zone and a circuit for power supply communicating with a tank pressurized mechanically by the effort of returning to its rest position a device comprising one or more springs stretched or compressed manually.

The invention is hereinafter explained in more detail with regard to two nonlimiting exemplary embodiments which allow the reheating of approximately 25 food rations for a group of soldiers on maneuver, with reference to the attached drawings.

 Figure 1 shows an overview of the portable cooking stove according to a first embodiment, showing a cooking station and a liquid fuel supply device.

 Figure 2 is an exploded view of a liquid fuel supply device according to a first embodiment.

 Figure 3 is a perspective view of a liquid fuel supply device according to a second embodiment.

 Figure 4 is a diagram of the stove supply circuit.

The container for reheating food and transporting the elements of the stove is not shown.

In the case of an exemplary embodiment according to the invention which is shown in Figure 1, the portable stove consists of a cooking station 10 and a liquid fuel supply device 30 connected by a flexible hose. 'feed 31. A vaporization chamber 13 of the liquid fuel is centered in a flame arrester 12 disposed above a burner body 11. The elements 11, 12, 13 are preferably made of refractory stainless steel. A retractable grid 14 for supporting a food reheating container (not shown) is articulated around the lateral uprights of the casing 15 of the cooking station 10 by two rods and the two lower recesses 14a of the grid 14 are positioned on the casing 15 of the heating block 10 when using the stove. For transport, the entire stove can be stored in the container used for reheating food. The use of the food reheating container as a transport element meets the current operational needs for lightness and mobility. The grid 14 is raised to allow the liquid fuel supply device to be stored next to the console during transport. The control console 16 supports a flow adjustment valve 17, a thermostatic ignition safety valve 18, an air adjustment pull 19 acting by a cam device on a circular air adjustment cup 25 shown on FIG. 4 and a fuel inlet 20. The purpose of the air adjustment is to seek optimum combustion. An inlet 21 cut out on the lower part of the conical burner body 11 allows the introduction of a preheating pad for the chamber vaporization 13 which can be made of asbestos soaked in fuel and disposed on the air adjustment cup located under the vaporization chamber 13. In the first embodiment of the device for supplying liquid fuel, the reservoir of the device the supply consists of a reservoir body 37 in the form of a hollow cylinder closed at its ends by a flange 36 and a piston 43. The lower flange 36 is provided with a threaded nozzle 32 for starting the fuel to which the supply hose 31 is connected, an “inlet” nozzle 33 which allows the filling of the tank, and a drain valve 34. Threaded rods 35 maintain the upper 38 and lower 36 flanges on the tank body 37. A retaining sole 41 articulated on the lower flange 36 allows the tank to be wedged during manual compression of the spring which results from the tensile force exerted on a piston rod 39 integral of a piston 43 and terminated by an articulated handle 40. The liquid fuel used is preferably a high boiling liquid fuel, such as diesel for example.

 Figure 2 is an exploded view of the liquid fuel supply device according to the first embodiment. The mechanical device for pressurizing the reservoir comprises a compression spring 42 housed in the body 37 between the piston 43 and the upper flange 38.

The seal between the tank body 37 and the piston 43 is ensured by a seal 45 protected by two scrapers 44.

 Figure 3 is an exploded view of a liquid fuel supply device according to a second embodiment of the invention. The mechanical device for pressurizing the reservoir comprises one or more hinges with spring hinged together, two in the case of the device described in FIG. 3, framing a reservoir pocket 53 made of flexible material and applying lateral compression forces to it this. The two spring hinges 55 and 56 are hinged together along their outer edges 54 and 57.

The filling of the bag 53 is carried out by immersing a strainer 51 in a reserve of liquid fuel, not shown, and by repeatedly pressing a suction bulb 50 manually.

 The spacing of the spring hinges is effected by the forced filling of the pocket 53 with the fuel discharged by the suction bulb 50 provided with a non-return valve device known in itself which can be housed in the body of the bulb 50 and not visible in FIG. 3. When the suction bulb 50 is pressed, the fuel contained in the bulb, which cannot return to the fuel reserve due to the non-return device, is pushed back to the pocket 53. The relaxation of the pear 50 causes the suction of a new quantity of fuel in the body thereof.

The filling of the tank can be done during operation, when the power of the flame decreases: it suffices to press again several times on the suction bulb 50, the liquid fuel is then pumped from the reserve of liquid fuel towards the pocket tank 53.

 During the operation of the stove, as shown in FIG. 4, the fuel coming from the tank passes through a supply circuit comprising in series a thermostatic valve 18 connected to a thermocouple 24, a flow control valve 17, a non-return valve. 22, a vaporization chamber 13 and a nozzle 23. The non-return valve 22 authorizes the filling of the tank during operation. The fuel vaporized in the vaporization chamber 13 exits through the nozzle 23 and the flame is self-supplied.

Claims (6)

1. Portable cooking stove with liquid fuel, in particular for reheating food, characterized in that it comprises a cooking station (10) provided with a chamber (13) for vaporizing the low-pressure liquid fuel heated by the heat given off by the combustion zone and a supply circuit communicating with a tank pressurized mechanically by the effort of returning to its rest position a device comprising one or more springs stretched or compressed manually. 2. portable cooking stove according to claim 1, characterized in that the supply circuit comprises in series a thermostatic valve (18) connected to a thermocouple (24), a flow control valve (17), a non-return valve (22), a chamber (13) for vaporizing the liquid fuel and a nozzle (23). 3. Portable cooking stove according to claim 1, characterized in that the fuel vaporization chamber (13) is centered in a flame arrester (12) disposed above a burner body (11). 4. Portable cooking stove according to claim 1, characterized in that the whole stove can be stored in the container used for reheating food. 5. Portable cooking stove according to any one of claims 1 to 5, characterized in that the tank is composed of a tank body (37) in the form of a hollow cylinder closed at its ends by a flange (36) and a piston (43), put under pressure by a spring (42) housed in the body (37) between an upper flange (38) and the piston (43). 6. Portable cooking stove according to any one of claims 1 to 5, characterized in that the tank consists of a pocket of flexible material (53), pressurized by one or more spring hinges hinged together, framing the pocket (53) and applying lateral compression forces thereon.