DE638618C - Liquid level indicator for container - Google Patents

Description

In the case of liquid level indicators for containers with a preferably transparent Material, for example made of glass, existing tube in which at least one end is connected to the inside of the container, there is always the risk that if the Tube a relatively large amount of liquid drains from the container. This can damage both those used in the container Apparatus as well as objects in the vicinity of the container enter. Devices are known when the water level indicator on the steam boiler breaks the steam or the water automatically block the outlet from the boiler. For example, a If the water level indicator is intact, the steam pressure acts on both sides of the valve as a result of the relief of one side of the valve from one side of the valve when the sight glass breaks Steam pressure against a spring force through the steam overpressure the sight glass connector to lock.

There are devices known which consist essentially of a flap which due to the internal excess steam pressure in the event of breakage, of the sight glass closes the sight glass connector. This flap is activated by one in the boiler water arranged float kept open. If the sight glass breaks, the The flap is closed against the buoyancy of the float by the steam pressure.

To operate such automatic locking devices are in most Higher pressures required. For liquid level indicators on containers in which If there is no significant overpressure during operation, such devices are inexpedient.

Sight glasses that have a double wall are also known for liquid level indicators to have. Both cavities of these sight glasses are, however, connected through an opening tied together. These liquid level indicators also behave against breakage of the sight glass like the normal single-walled sight glasses. The liquid to be monitored can escape without the level indicator by an automatically operated valve against which the monitored liquid containing container is completed.

The invention overcomes all of these deficiencies by the following arrangement:

According to the operationally lower end of the tube or the protrudes Sight glass into a dead space, which is connected to the cavities in the pipe wall. In the connection line from the tank,

*) The inventor has been indicated by the patent seeker;

Karl Müller in Schwaig b. Nuremberg.

which contains the liquid to be monitored, a closing organ is inserted into the dead space, which is coupled to a float which is usually accommodated in the dead space - _{the cavity in the pipe wall connected to the dead space (} the cavity in the pipe wall can be designed as a capillary. "

As long as the tube is in working order, practically no liquid can enter the dead space

to penetrate because the air trapped there cannot escape. But as soon as the tube breaks, this space immediately fills with liquid. The float is raised and closes the closing organ coupled with it.

The invention will be explained in more detail with reference to the drawing, in which an oil level indicator for the oil conservator of a transformer or other electrical apparatus.

The four-bond line is denoted by ι, which leads from the oil level indicator to the oil conservator. The glass tube 2 of the oil level indicator protrudes with its operationally lower end into a dead space 3, which is located in a capillary 4 of the tube wall 2 continues. Instead, the tube wall could also cover a larger part of the circumference be hollow. S is a swimmer housed in the dead space, the is coupled to the valve 6.

In the normal state, the oil in the dead space reaches the level indicated by the line AB because the air trapped in the dead space cannot escape. The float 5 is held in the position shown by the air pressure, thereby keeping the valve 6 open. As soon as the tube 2 breaks, the air can escape through the capillary 4 from the dead space.

The swimmer becomes as a result of the decreased air pressure and which is in the dead space subsequent liquid lifted and ^ closes the valve 6, so that no significant Oil loss can occur. With the [, float 5 a contact device / tang be coupled with a signal or alarm device when the swimmer is buoyant actuated.

Thus, for example, when replacing the oil level glass, the valve 6 can also be operated by hand can be closed, the valve disk is attached to a outside of the supply pipe Handle 7 coupled.

Claims (2)

Patent claims: i. Liquid level indicators for containers, in particular for oil conservators of electrical apparatus, e.g. B. transformers, with one preferably made of transparent Material existing tube provided with hollow wall parts, one or both ends of which with the container in Are connected and valves close automatically when they break, thereby characterized in that the operationally lower end of the tube protrudes into a dead space (3) with the cavities (4) the pipe wall (2) is connected, and that in the connecting line from the container to the dead space a closing element (Valve 6) is inserted, the one housed in the dead space Float (5) is coupled. 2. Liquid level indicator according to claim i, characterized in that the Tube wall contains a capillary that is only in communication with the dead space. 1 sheet of drawings