DE1072226B - - Google Patents

Description

GERMAN

The invention relates to a device for supplying liquids at a low, constant speed from a container to a consumer. In particular, the invention is directed to a device for supplying carburizing media to metallurgical, heat treatment furnaces.

There is a row i v _i On industrial processes in which precisely measured quantities of liquids from one container to the point of use with very low flow rates, for example, one-half to einige'Liter per hour and less, must be fed .. Until now used for this purpose a volumetrically conveying pump. It has been found, however, that finer control is possible if a comparatively low air pressure on the order of 0.3 to 0.7 atmospheres above the liquid in conjunction with a fine one. Control needle valve and a flow meter are used. .

Certain liquids have a tendency to trap small amounts of air, and these air pockets can result in flow irregularities. \

The device according to the invention for supplying a liquid at a low, constant speed from a container via a line to a consumer point consists of a closed container for the liquid, a container inlet above the liquid, which is connected to a source of compressed air is, a liquid outlet that goes up from a low tank level to a fine needle control valve leads, a flow meter and a chamber that is controlled by a float Valve and an air outlet to the atmosphere are provided in the conduit between the flow meter and the consumer point is at a height that a gravity feed of the Chamber to the consumer point allows.

The switching on of the chamber with the float-controlled valve in the supply line enables the escape of entrained air into the atmosphere and ensures that no liquid escapes can, if the outlet at the consumer point is closed, because the float-controlled Valve shuts off the flow from the container as soon as the level in the chamber reaches a certain height Has.

The device according to the invention finds a flexible connection to the drop feed line If used in the wreath of a blast furnace, the chamber is then preferably arranged at a height in your float actuates the needle valve to shut off the flow of liquid from the container when when lifting the blast furnace ring one leg of the

Contraption. for supplying liquids at a slow steady speed

Applicant: Wild-Barfield Electric Furnaces Limited, Watford, Hertfordshire (UK)

Representative: Dipl.-Ing. R. H. Bahr and Dipl.-Phys. Ε. Betzier, patent attorneys, Herne, Freiligrathstr. 19th

Claimed priority: Great Britain 6 January 1956

Charles Claydon Ellis, Watford, Hertfordshire (Great Britain), has been named as the inventor

flexible connection above the normal float level.

This creates an undesirable and in many cases dangerous liquid influx into the hot Prevents furnace when lifting the furnace ring and ensures that when work starts again the flexible pipe has not taken in any air.

The vent opening is preferably formed by an adjusting screw provided with a groove, which passes through the closed lid of the chamber.

The arrangement is made in such a way that when the adjusting screw is tightened, not only the vent opening completed, but the float is also prevented from climbing so far that it hits the valve closes. This makes it possible to keep the whole system under pressure at the start of the work process to fill standing liquid.

Normally, however, the device according to the invention is used with the adjusting screw slightly loosened, so that the vent opening is open and the valve is in an upward movement of the Float closes.

A preferred embodiment of a device according to the invention is given below as an example are explained in more detail. The drawings show in

909 707/322

Claims (3)

1 shows a schematic side view of a liquid supply system for a metallurgical furnace, FIG. 2 shows a vertical slit through an air outlet and liquid shut-off valve, as is used in the system according to FIG. The device shown is intended to provide carburizing liquid to a blast furnace at a steady, slow speed of, for example, 0.2 l / hour. and feed about it. A liquid container 1 with a capacity of several liters and having an upright cylindrical shape is provided with a liquid level meter 2 and a filler neck 3. The closed lid of the container receives an air inlet line 4 through which compressed air at a pressure of 0.3 to 0.7 atmospheres is pressed onto the surface of the liquid contained in the container. · · ■■ The air can be supplied from a normal working air source via a device 5 which has an automatic pressure regulator, a check valve and a water trap in combination. The outlet line 6 for the liquid begins near the bottom of the container and leads over a filter 7, a finely adjustable needle valve 8 and a flow measuring device 9, for example a rotameter. From the head of the flow meter 9, a line 10 leads the liquid to the valve-controlled inlet 11 of the venting chamber 12 (FIG. 2). The valve is arranged so that it is closed by the float 13 when the liquid rises above a certain level in the chamber, as is known for example in carburetors. An air outlet opening is in the form of a slot in the thread of a screw 14 which is passed through the end cover of the chamber and is normally unscrewed a few threads. If the screw 14 is fully tightened, the outlet opening is closed by a washer screw 14o below the screw head, and the lower end of the screw prevents the float 13 from closing the valve. The screw is tightened in this way when the system is to be filled with liquid from the container 1 under pressure. A flexible tube connects the outlet 15 of the chamber to a shut-off valve 16 on the rim of the metallurgical furnace. The outlet of the shut-off valve leads to a drip pipe 17 which penetrates the heat-resistant lining of the furnace ring 18. The furnace ring can be raised and swiveled and is arranged at such a height with respect to the liquid level mentioned above in the chamber 12 that the float automatically shuts off the liquid supply as soon as the furnace ring releases the furnace when it is raised. In operation, without using the ventilation chamber in the system, the amount of liquid set at the needle valve 8 is falsified because, with a certain flow of liquid, a corresponding amount of air trapped in the liquid is entrained over time. This is separated by the activated ventilation chamber and thus the amount of liquid flowing through per unit of time is kept constant for any length of time. In addition, an automatic flow switch-off is ensured if the furnace ring should accidentally be raised without closing the switch-off valve 16. Patent proposal: HK: 1. Device for the slow and steady supply of a liquid to a consumer from a closed storage container which has an inlet for compressed air above the liquid level and a liquid outlet below the liquid level, characterized in that the outlet (6) is in a riser connected in series are: a fine control needle valve (8), a flow meter (9) and a venting chamber (12) with a float-controlled check valve (11, 13) and an upward in the Atmosphere leading air outlet (14) is provided, and that down to the ventilation chamber one The preferably flexible pipeline leading to the lower consumer point (18) is connected through which the liquid can flow freely from the chamber (12) to the consumer point can. 2. Apparatus according to claim 1, characterized by a shut-off device for the air outlet (14) which, in the shut-off position, the float (13) of the valve (11) blocked in its open position and thereby the free passage of the Liquid allows. 3. Apparatus according to claim 2, characterized in that the locking device consists of an adjusting screw (14) provided with a groove and inserted through the lid of the chamber: Considered publications:
German Patent Nos. 449 149, 203 009;
Swiss patent specification No. 16 976. For this purpose, 1 sheet of drawings