SU82797A1 - Rotameter - Google Patents

Description

The invention; -1 does not apply to devices for measuring the flow of a liquid or gas with a channel with a variable cross-section and a float (so-called rotameter) in this channel.

The known rotameters with glass measuring tubes have the disadvantage that, due to the brittleness of the tube, it must be protected with a casing, etc. This makes the whole device cumbersome, and the manufacture of a glass tube for a rotameter is very difficult and expensive. .

The design of the rotameter is described, which reduces its cost by using a measuring tube made of transparent plastic and simplifying it by using the tube at the same time as a supporting structure. In this case, the tube has only one polished face, on which divisions are applied, while the rest of the outer surface of the tube is left smooth.

FIG. 1 shows a rotameter partially in section; in fig. 2 is a cross section of the rotameter according to AL in FIG. 1, in FIG. 3 is a section through 5 in FIG. one; in fig. 4 section of explosives in FIG. one.

The tube is made of plastic (Plexiglas), which combines the transparency necessary to monitor the position of the float with strength and good processability.

In the drawing, the tube / at the bottom is conventionally rotated in order to show its side view. The cap nuts 2 connect this tube through gaskets 7 to connectors 3, which serve to connect the instrument to the pipeline through which the measured gas or liquid passes. A float (rotor) 4 is placed in the tube channel. This float should not touch the walls of the measuring tube.

Since the entire device is mounted vertically and the liquid or gas moves upwards, the velocity head acts against the weight

No. 82797-2 -

the float. As the velocity head increases (i.e., the difference between the top and bottom of the float), the float tends to rise upwards.

The float moves up the tube until the velocity head decreases so much that it is no longer able to raise the float upwards.

The position of the float corresponds to a well-defined gas or liquid flow. The tube is calibrated on the outside in such a way that the float indicates the flow of gas or liquid, the passage of the tube through the device.

The movement of the float 4 is limited to end stops 5 and 6, which protect it from impacts and damages due to a sudden change in the flow rate or pressure of a gas or liquid,

In the lower stop 6, besides the ventral hole, into which the float 4 enters with its conical lower part, there are several more, like four, side openings serving for the passage of gas or liquid.

Upper arm 5 is made in the form of a plastia, mounted across the channel, measure. With a / in such a way that gas or liquid can freely bypass this stop.

For convenience of observation, the front of the tube is polished, and the side and back sides are left matte. Due to this, the light is scattered with a dull surface and the details are clearly highlighted.

Subject invention

1. Rota.metr. This is due to the fact that, in order to use its three-track construction at the same time, both as the main supporting structure and as a measuring organ, this tube is made of transparent plastic.

2. The form of the rotameter according to and. 1, characterized in that, in order to facilitate, the tube has at least one flat polished / dividing face, while divisions of the outer surface of the tube are matte.

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