SU26945A1 - Instrument for indicating the level of liquid in tanks - Google Patents

Description

The present invention relates to already known instruments for indicating the level of liquid in tanks, in places that are inconvenient or inaccessible for non-immediate observation, which are based on balancing the hydrostatic pressure in the tubes, and differs from them in a constructive form of implementation.

The device schematically shown in the drawing consists of a U-shaped tube facing downwards, which serves to monitor the level of a liquid, the ends of which have taps /, / and are connected to the pipes (7) and O, which connect it to the tank. The tube consists of two gauge glass A, connected by its upper ends with box B with unscrewing plug C and inserted with lower ends into box D divided by a partition with a three-way valve E. For direct connection of forward and reverse pipes / 7 and O during filling and adjustment device they are interconnected pipe F with a crane / J.

Pipe / 7 is attached to the bottom of a hermetically sealed intermediate tank a connected to the bottom of the tank by an upper part. Pipe O is attached to the top

another intermediate tank, used to condense the steam formed in the steam boiler, and consisting of a hermetically sealed lid C of the vessel with a pipe located inside its spiral-bent with openings with /, connecting with a stop valve / 1 tank e to the tank.

The operation of the device installed in the steam boiler is as follows. First, the instrument is filled. For this, tanks a and e are poured with water, then the taps are opened (), on the forward and return lines.

According to the law of communicating vessels, the water level in the return tube will tend to be installed at the same height as the level in the boiler. In this case, the water filling the device will force out the air in the condenser through the pipe O. The increase in the level in the reverse line O will occur until the air pressure in the tank is balanced by the double steam in the boiler. Then, opening the faucet / ,, report the water space of the tank with the steam space of the boiler.

By closing the taps on the forward and reverse tubes and opening the three-way tap, water is released from the waterglass to the middle level position and through

the cork is filled with water to the top with a liquid that is not miscible with water and differs from it with its specific weight. Then tighten the cork and open the taps.

All stodba liquids, with the average position of the levels, are mutually balanced, and the meniscus, the border of two liquids in gauge glass A, marks the average level of fluid in the reservoir. When the liquid level in the upper vessel rises, the pressure created by the liquid columns of the left side of the device to the right increases, the balance is disturbed, and the meniscus in the left glass starts moving upwards, and in the right glass it moves down accordingly. The fluid level in the return tube will also increase slightly.

With the new position of the levels, the pressure of the left side on the right side is compared, and again all the liquid columns are mutually balanced.

A similar phenomenon will occur with a decrease in the level in the upper vessel at which the movement of the menisci changes its sign.

Thus, the fluctuation of the level of the liquid in the upper vessel will exactly correspond to the movement of the meniscus in the left-gauge glass, on which it is possible to observe.

If at the same time the air pressure in the tank rises, then part of the water from the water space of the tank through spiral C1 will be forced into the steam space of the boiler. If, on the contrary, the air pressure drops, then steam will flow from the boiler into a spiral, then it will be undensed and in the form of water will fall into the water space of the tank, the level of which will increase, and the pressure will be equal.

When the tank is filled to the top of the device, it is filled with water, and its capacity should be sufficient to fill the entire system and, with fluctuations from maximum to minimum, its bottom part would always be filled with water.

The tank, installed on a straight line and filled with water, plays in this case the role of a sump.

In addition to the installation in a steam boiler, it goes without saying that the device can be used to measure the level of other liquids, oil, etc.

The subject matter of the invention.

A device for indicating the level of liquid in tanks based on balancing the hydrostatic pressure in the tube connected to the bottom of the tank, characterized in that the U-shaped tube facing downward with both knees filled with a density liquid different from that of the fluid in the tank is connected to both the knees with the tank using two intermediate tanks, of which the first tank, attached in its upper part to the lower part of the tank, is filled with liquid and provided with a hole in its lower part for communicating The second tank, connected in its lower part to the tank, is filled with liquid and air, connected in its upper part with the U-shaped tube and assigned to serve as a condenser for the vapor formed in the tank.

to the author's testimony of S.I. Eusov

No. 26945

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