DE2218045A1 - Float for a level indicator - Google Patents

Description

DIPL-ING. WULF WEHSER Roscherstraße 12 (formerly WelBekreuzstraße)

PATENT ADVERTISER Tel .: (G5M) 21449

Private: (05308) 2315

Ets A. JOHNSON & Cie PARIS

48/50 Rue Albert, Paris 13e / France

J 123 - tfs / Be

Float for a level indicator

The invention relates to a float for a level indicator, in particular for steam boilers, which, e.g. in electricity or power plants, at temperatures of about 100 C and operating pressures up to about 100 bar.

In systems of this type there is the problem that the relatively high temperatures and the relatively high operating pressures affect the properties of the float of the level indicator " can change in such a way that incorrect displays or even failure of the level indicator occur

The invention is accordingly based on the object To create floats for a level indicator! compared to the outer ones occurring in a liquid medium Pressures as well as against high temperatures and temperature—

Fluctuations is insensitive and in particular in relation to gases or liquids acting on it from outside that could change its properties, is impermeable "

This object is achieved according to the invention in that the float consists of a hollow metal body filled with a pressurized neutral gas.

With this training of the swimmer it is achieved that the neutral gas inside the metallic hollow body counteracts external pressures and temperatures or temperature fluctuations acting on the float without the swimmer loses his or her ability to swim

For certain display devices, the hollow metal body be a cylinder that is closed by two rounded domes

However, a float that is particularly resistant to external pressures is obtained when the hollow metal body consists of at least one sphere, which consists of two hemispheres connected to one another by soldering or welding

20984S / Ö776

is made with the hemispheres hydraulically shaped to maintain their strength »Depending on the buoyancy required in each case, several balls, in particular two balls, can be provided which are interconnected by brackets.

In order to reduce the stresses in the area of the soldering or welding points of the float and to reduce the mechanical stress To improve the properties of the metal, it is useful when the swimmer undergoes a thermal aging treatment is subject.

The invention is explained in more detail below using an exemplary embodiment in the drawing.

Figure 1 shows an embodiment of the float according to the invention, in which this is made up of a series of balls.

Figure 2 shows another embodiment of the Float, which here has a cylindrical shape.

209845/0776

In Figure 1, a steam boiler 1 and the housing 2 of a float 3 is shown »which via valves 4 and 5 with connected to the steam boiler 1 * The float 3 carries at the end of a rod 6 a magnet 7 sliding in a guide sleeve in a closed glass tube 8, which is arranged next to the guide sleeve of the magnet, there is a ball 9 made of soft steel, which is shifts along a graduation and indicates the liquid level in the steam boiler 1. The glass tube 8 is for example filled with a butylene alcohol, in the the ball 9 is immersed.

The level indicator can be equipped with a transmitter which is essentially formed from a potentiometer 11, which rotates through an aluminum tube 12 is offset, with a screw strip 13 made of magnetic material is arranged on the aluminum tube, the can be acted upon by the magnet 7.

In the embodiment according to FIG. 1, the float consists of two balls 14 and 13, which are supported by a holder 16 are connected. The balls 14 and 15 are each made consisting of two hemispheres soldered or welded together, which are formed hydraulically. The bullets are filled with a neutral gas, for example with argon »

209845/077 6

To avoid that the gas through the metal of the balls emerges, the balls are preferably made of titanium The gas is introduced into the balls through a valve / stem 17, for example.

In Figure 2, the float is generally cylindrical Shape and is designed as a cylinder 18 made of titanium, which is rounded at both ends by. Calottes 19 and 20 is closed. The upper dome is provided with a valve 17 to lower the float A ring magnet 21 is arranged inside the cylinder, which is rigidly secured by means of a grid 23 is attached, which is arranged on a rod 22, which in turn is connected to the lower dome 19 The float according to Figure 2 is particularly suitable for a direct visual reading of the level, wherein the counterpart to the ball 9 according to Figure i in the magnet 21, which exactly the liquid level in the steam boiler indicates.

The cylindrical float is particularly suitable in cases where pressures below 75 bar occur. For the higher pressures up to about 200 bar it is preferable to use the one from the balls

209846/0776

and to use 15 existing floats, as the balls can better withstand external pressures.

The number and dimensions of the balls vary depending on the operating conditions of the swimmer as a level indicator · For example, a float consisting of two titanium balls, which is filled with argon is filled under a pressure of 60 bar, work at temperatures of up to 350 C and under a pressure of up to 200 bar »

In the embodiments described, the float is made of titanium. For a use in a special Corrosive environment, it is advisable to make the float from other metals or alloys, such as steel, stainless Made of steel or a corrosion-resistant nickel alloy (Monel).

Among other things, the internal pressure of the gas in the float can range from about 10 to 100 bar * the order of magnitude of 6o bar is common.

209841/0778

Claims (1)

2218Q45 3 HANOVER, April 13, 1972 RoscherstraBe 12 (formerly WelBekreuzatraBe) Tel .:(0511)21449 Private: (0530S) 2315 Ets A. JOHNSON & Cie PARIS Rue Albert, Paris 13e / France J 123 - Ws / Be Expectations 1 · float for a level indicator, characterized in that the float (3) consists of a hollow Consists of a metal body which is filled with a pressurized neutral gas 2 · float according to claim 1, characterized in that the hollow metal body is a cylinder (18) which is closed by two rounded domes (19, 20) is. 3. float according to claim 1, characterized in that the hollow metal body made of at least one ball (l4,15) consists of two hemispheres connected to one another by soldering or welding, wherein the hemispheres are formed hydraulically. 209845/0776 4. float according to claim 3 »characterized in that that two balls (l4, l5) are provided which are connected to one another by brackets (l6) « 5. Float according to claim I _1, characterized in that the float (3) is subjected to a thermal aging treatment in order to reduce the stresses in the area of the soldered or welded seams. 6. float according to claim 1, characterized in that that the pressure of the neutral gas is between 10 and 100 bar. 7. float according to claim 6, characterized in that that the pressure of the neutral gas is about 60 bar. 8. float according to claim 1, characterized in that that the float (3) is made of steel. 9 · float according to claim 1, characterized in, that the float (3) consists of a stainless steel. 10. float according to claim 1, characterized in that the float (3) consists of titanium. 209 b \ S / 0776 11. float according to claim 1, characterized in that the float (3) consists of a corrosion-resistant nickel alloy (Monel) » ? 098A S / 0776 '■' ■■ "''" Blank page