SU70215A1 - Hydraulic lag - Google Patents

Description

The known hydraulic lag devices made according to the Pitot scheme for measuring the speed of a ship and the distance traveled by it have drawbacks: structurally, they are made of different types depending on the application (on high-speed or low-speed ships) and have different sensitivity. In addition, in the existing logs there is no possibility of full automatic compensation of lag corrections with changes in the speed of the ships.

In the proposed lag, a swinging double-arm lever was used for mutual compensation of static pressures. Elastic diaphragms mounted in cone-shaped vessels rotated 108 ° relative to each other are rigidly connected with the arms of the lever. The change in air volume in these vessels serves as a measure of the measured speed. Such a device makes it possible to eliminate the drawbacks of the known hydraulic lags, drastically increase the accuracy of their work and extend the area of their use.

The drawing shows schematically the device proposed hydraulic lag.

Using a Pitot tube, the dynamic pressure of the medium is applied to the measuring instrument, through a system of hermetic vessels, as the difference between the static pressure and the sum of the dynamic and sgatical pressure. For this purpose, vessels 1 2 are used, inside of which there are rubber diaphragms 3 and 4 dividing the internal cavities of the vessels into two parts: hydraulic () and air (upper). From these pressure vessels, pipelines are fed into power vessels 5 and b, the internal cavities of which are separated by rubber diaphragms 7 and S. A reciprocating double arm 9, one shoulder of which is rigid, is used to compensate for static pressure received from the Pitot tube The other 10 and the plate 11 are connected to the diaphragm 7, and the other arm the second 12 and the plate 13 to the diaphragm 8. The pressure received by the diaphragms is transmitted to the lever 9, whose shoulders can only be raised

No. 70215-2 -

iodine by the action of dynamic pressure. As a sensitive element, balancing the dynamic pressure, are cone-shaped vessels M and 1/5, rotated 180 ° relative to each other. The measure of the measured speed is the change in the volume of air in the vessels, carried out with the help of elastic diaphragms mounted inside the vessels 14 and 15, rigidly connected to the arms of the rocking arm 9 using fasteners similar to those of the 12 and plate //. Since vessels 14 and 15 have the shape of truncated cones, in their smaller cross sections, at low speeds (at low pressures), the heights of the air column change more than at the same pressure changes at high speeds of the ship . This circumstance makes it possible to make the lag almost equally sensitive at all ship speeds.

The speed of the ship is determined using a scale of 16 and an arrow 17, mounted on one axle with gear 18, connected to sector 19. The latter is fixed on the lever 20, which, under the action of the spring 21, rotates around the axis as the speed of the ship changes. The lagged distance counter is a disk mechanism 23 operating from a power rotary relay 24 controlled by a clock mechanism 25. The distance traveled is indicated by an arrow 26 on a scale 27. Regulators 28 and 29 s. leverage is used to automatically introduce corrections, depending on the change in the speed of the ships.

Subject invention

The hydraulic lag, for measuring the speed of a ship and the distance traveled by it, is made according to the Pitot tube scheme, with which the dynamic pressure of the medium is supplied to the measuring instrument, as the difference between the sum of the dynamic and static pressure and the static pressure, differing in that static pressure compensation applied swinging double-arm lever, whose shoulders are rigidly connected to the elastic diaphragm mounted in 180 ° conical vessels rotated relative to each other, changing air volume in which serves as a measure of the measured speed.