DE1071359B - - Google Patents

Description

GERMAN

KL.42e 23/01

INTERNAT. KL. GOIf

PATENT OFFICE

G 21041 IX / 42e

REGISTRATION DATE: DECEMBER 5, 1956

NOTICE
THE REGISTRATION
AND ISSUE OF THE
EDITORIAL: DECEMBER 17, 1959

There are flow meters known, which the per unit of time flowing through a pipeline or gas Amount of liquid with the help of floats or floats, which are guided in conical measuring tubes will measure.

These measuring devices are often provided with minimum or maximum contact. This is supposed to z. B. an acoustic or optical alarm device when the flow stops or when it is reached a certain flow rate can be put into action.

Flow monitors are also known; H. Devices that are not used for measuring, but solely for alarming when the flow stops or when a maximum value is reached.

In these known designs, contact is made either by being in the liquid even contacts lie, or by the fact that the measured value inductively or by magnets to the outside is transmitted.

In the case of flow meters or flow monitors with a movable float, the float path is relatively short when the flow conditions change, especially when the flow is very low. He is over the shorter, the stronger the conicity of the measuring tube.

This is particularly noticeable in the case of flow monitors that do not depend on measuring accuracy arrives. In order to ensure a short overall height, these devices are very conical Measuring tubes, or the float just lies loosely like a valve disk on the tube opening.

This short float path is a disadvantage if there is a slight change in the flow conditions due to the short distance caused the contacts to hit multiple times. Particularly uncomfortable this has an effect on magnetic transmission. The magnet still sticks from the outside of the Measuring tube located opposite pole attracted, although the float has already performed a small movement Has. The release of the opposite pole is hesitant or pendulous.

The subject of the invention is now a device to prevent this sticking of the magnets or swinging of the contacts to prevent and to achieve a safe and more precise contact. This is done by the swimmer or the float at the point where the contact is to be made, in a cylindrical or almost guided cylindrical pipe section.

It is thereby achieved that when there is a change in the flow conditions that are in the range of the critical Amount (minimum or maximum) occurs, the swimmer moves up or down by leaps and bounds and in this area the swimmer's path is lengthened.

Flow meter and flow monitor

Applicant:

Ludwig Grefe, machine factory, Lüdenscheid, Lösenbacher Str. 29

Rudolf Vogt, Lüdenscheid, has been named as the inventor

Sheet I of the drawing shows z. B. an embodiment of a flow monitor.

A shows the flow monitor in the rest position, B in the working position.

The float 1 is guided on the fixed guide rod 2. The usual conical measuring tube is replaced by a short cylindrical piece of pipe, which is only flared at the upper edge, for better catching of the swimmer. The float 1 sits firmly on the float tube 4, which carries the magnet 5 at the upper end.

In the rest position A , the float magnet 5 has an opposite pole attached to the microswitch 6. 7 opposite.

When the flow begins, the float is immediately lifted by at least the length of the cylindrical part of the tube 3 and suddenly and seamlessly removed from the force field of the magnet 7 or brought back in again. Due to its own weight and the spring force of the switch 6, the magnet 7 falls back and the circuit is interrupted by the switch 6 (see working position B).

When the flow stops, the swimmer 1 also suddenly falls back into the rest position. The magnet 5 attracts the opposite pole 6 again and closes the circuit via the switch. If between If a "free annular gap is attached to the float 1 and the pipe section 3, contact is made not at zero, but at any minimum amount.

Sheet II of the drawing shows the device used in a known float knife. At the Cylindrical parts are added to the inlet or outlet of the conical measuring tube the critical flow rate a jerky

909 689/162

To achieve swimmer movement with a corresponding longer way.

In special cases, the attached pipe section can also be made slightly conical. Essential The only thing is that the conicity differs greatly from the conicity normally used for measuring or the float is guided in such a slightly conical piece of pipe, with its conicity not for use in known measuring tubes for a power corresponding to the nominal size sufficient.

The progress of this arrangement is that by enlarging the float path when When the critical measured values are reached, the electrical contact is made reliably or quickly and safe loosening and closing of the magnets takes place with magnetic transmission.

The application of magnetic transmission for making contact is carried out by the device according to FIG In many cases, invention made possible. Since with this type of transmission the contacts outside the Liquid can often be used with larger switching capacities.

Claims (3)

Patent claims: 1. Flow meter and flow monitor with contact, characterized in that the Measuring tube (3) is not uniformly conical over its entire length, but rather cylindrical Has heels. 2. Flow meter according to claim 1, characterized in that the paragraphs at the points on which contact is made are conical to a much lesser extent than that remaining measuring tube. 3. Flow meter according to claim 1, characterized in that the float (1) in flow monitors guided in a cylindrical or so slightly conical pipe section (3) is, its conicity for use in known measuring tubes for one of the nominal size corresponding performance is not sufficient. 1 sheet of drawings 909 689/162 12.