SU735941A1 - Underwater barometric level - Google Patents

Description

one

The invention relates to instrumentation, and more specifically to devices for underwater leveling, operating on the principle of measuring the pressure difference of liquid columns at controlled points of an underwater object.

A device for underwater leveling is known, comprising a mercury manometer, the readings of which are proportional to the depth of the device 1.

The disadvantage of the device is a low: sensitivity, and, therefore, low measurement accuracy.

The closest in technical essence to the present invention is a device comprising a housing with reference and working pressure chambers and an elastic manometric element with a measurer of its deformation 2.

The main disadvantage of this depth gauge is its low resolving power, which does not allow to ensure measurement accuracy that corresponds to even the lowest class of construction leveling.

The purpose of the invention is to improve the leveling accuracy.

To do this, a valve and shut-off and relief valves are introduced into the proposed device, with a shut-off valve installed at the inlet of the gauge element, and a valve and by-pass valve between 5 working and reference pressure chambers.

When this bypass valve. can be made in the form of two communicating tubes filled with liquid and two capillaries connecting the upper and lower portions of the opposite tubes.

to

The shut-off valve can be made in the form of a container filled with liquid, in the upper part of which curved capillary tubes are installed. In addition, conical shaped damping diaphragms with calibrated holes in the top and at the base can be installed at the inlet of the working pressure chamber to damp the pressure pulsations.

FIG. 1 shows the underwater barometric level, vertical section; 20 in FIG. 2 - the same cross section; in fig. 3 - stop valve; in fig. 4 is a diagram of the operation of a V-shaped safety valve; FIG. 5 is a diagram of the action of the check valve.

2. A; .ft ---- aV, -1r-V. -1 The device contains an elastic element, in the form of a membrane box with temperature compensators .1-st and 2nd kind and switch mechanism; enclosed in a rigid housing 2 and porthole 3. The housing 2 is divided by a partition 4 into upper and lower chambers. The inner cavity of the membrane box 1, located {1 in the upper chamber, is connected to the lower chamber by a capillary tube 5 protected by a shut-off valve 6 from water ingress when the level is accidentally tilted. The upper and lower chambers communicate through the plug valve 7 with the control knob 8, the tube 9, the built-in relief valve 10 and the capillary tube P. The safety valve is made in the form of two fluid-filled tubes and two capillaries. 12 connecting upper and lower portions of opposing tubes. To prevent liquid from flowing out of valve 10, the upper portions of both tubes terminate in catchers 13. In the lower chamber of the housing there are damping diaphragms 14, made in the form of a side surface of a cone and having openings in version 15 (for passing air and water) and around the base 16 ( to drain water when raising the level). The vertical (working) position of the level is provided by a weight 17 embedded in the lower part of the body, having an opening 18 for the passage of water and a support 19 for placing the level on the measuring point. The level works as follows. After installing the level of the supports 19 on the reference point, the diver closes the previously opened cork valve and thereby separates the upper and lower chambers of the device. When the instrument is transferred from a reference point to a reference controlled point in the air bubble of the lower chamber, a pressure corresponding to the elevation of the new point is established, and in the upper chamber the pressure corresponding to the reference point is maintained. The difference in these pressures deforms the membrane box 1, which is transmitted to switch mechanism with a scale graduated in units of weight. When tilting or tilting the nevörler (see Fig. 5), the capillary tubes of the valve 6 are covered with liquid, which prevents water from entering the lower chamber into the internal cavity of the membrane box 1. The safety valve 10 works as follows (see Fig. 4). When raising the level, when the pressure in the lower chamber drops, the liquid from the right valve tube goes to the left.

Claims (2)

735941 When its level reaches the lower part of the capillary 12, the air from the upper chamber through the tube 11, the free right tube and the capillary p 12 passes into the lower chamber of the housing. . - - ,, When immersing the right level and left valve tube, the roles change. Thus, the safety valve limits the maximum possible difference in the upper and lower chambers and protects the membrane box from overloading .... Damping diaphragms 14 with apertures 15 and 16 reduce the pressure pulsations in the lower chamber of the device arising from the wind waves on the surface -: -. water when working at shallow depths. The conical shape of the diaphragm prevents the formation of air pads that distort the reading of the level. The openings along the edges of the diaphragms and the conical top surface of the load 17 provide for a free and complete discharge of water through the holes 18 after completion of the work under water. .. The invention provides no less, and at greater depths and currents, even significantly greater accuracy of measurements than the measurements currently carried out with the aid of a lath and surface level, let alone measuring with a foot, lot or echo sounder. At the same time, the leveling process itself is greatly simplified and its productivity increases. Claim 1. Underwater barometric level, comprising a housing with chambers of reference and working pressure, an elastic manometric element with a strain gauge, characterized in that, in order to improve measurement accuracy, a valve, check valves and relief valves are inserted, and a check valve is installed at the inlet of the gauge element, and the valve and the relief valve between the working and reference pressure chambers. 2. A level according to claim 1, characterized in that the overflow valve is made in the form of two communicating tubes filled with liquid and two capillaries connecting the upper and lower portions of the opposing tubes. 3. A level device according to claim 2, characterized in that the damping diaphragms of conical shape with calibrated holes in the top and bottom are installed at the inlet of the working pressure chamber. 4. A level according to claim 1, characterized in that the shut-off valve is in the form of a 5735941 bones filled with fluid in the top1. Reyfer, A. B., et al. Handbook of parts of which are fitted with curved capillary hydraulics and fatigue tubes. Information sources. taken into account in the examination to newcomers Hydrometeoizdat, 1976, p. 185-187. 2. Patent of Germany No. 1423961, cl. G 01 L 13/02, published 1972 (prototype). .5 L -eight .15 .18 nineteen .U Pus.j (Pue.5