Device for determining liquid column height

FIELD: engineering of equipment for measuring height of liquid column in vessels filled with specific liquids, for example, sewage water.

SUBSTANCE: device for determining height of liquid column in a vessel includes vessel with pipe, measuring device and air feeding device. Also, one end of pipe is connected to air compressor, while another, open, one is provided with protective mesh and positioned inside the vessel near its bottom. Pipe is provided with locking valve and measuring device, for example, manometer, placed after the locking valve.

EFFECT: simplified construction, facilitated measurement of liquid column height.

1 dwg

 

The invention relates to techniques for measuring the height of liquid column in containers filled with specific liquids, such as sewage.

For measuring the height of liquid column in such containers are not suitable device, such as a float-type "Sensor" see RF patent No. 2006001, CL G 01 F 23/72, 1991, as their use is not always convenient and hygienic.

Known technical solutions "Method of remotely-avoidant determine the level of medium in the tank" for application No. 2001122058, CL G 01 F 23 /284, 2003, and "method for determining the height of the liquid level (options), see RF patent № 2231028, CL G 01 F 23/22, 2004, are complex and expensive, require certain conditions and properties of the liquid medium in the vessel.

Modern development of sewage treatment plants, used in the construction of the cottage provides the location of such tanks buried in the ground, it is therefore necessary to develop such indirect non-contact device that is simple in design, allowing to determine the height of the liquid column, without opening the container and not in contact with the liquid.

The closest technical solution is the technical solution the Device for controlling the liquid level in vessels under pressure"described in the patent of Russian Federation № 1712788, CL G 01 F 23/22, 1989, the Device including the em capacity with a pipe measuring device, a pulse tube, flow regulators and communicated with him a vessel with knees. However, this device is complex and requires the capacity to perform sealed, which complicates the device.

The objective of the proposed technical solution is to create a device that could provide simple, reliable, non-contact measurement of liquid column in the tank, which is located below the surface of the earth.

Technical result achieved when using the claimed invention is to simplify the design, to improve the ease of measuring the height of liquid column.

The task and the achievement of the technical result is ensured by the fact that the device for determining the height of the column of liquid in a tank comprising a container tube, a measuring device and means for supplying air to one end of a tube connected to the air compressor, and the other, open, provided with a protective grid and is located inside the tank at its bottom, while the tube is provided with a locking valve and a measuring device, e.g. pressure gauge, located after the locking valve and the height of the liquid column is determined by the formula:where d is the density of liquid, g is the acceleration of gravity, R1the indications ISM the measuring device, Rand- atmospheric pressure.

The drawing shows a device for determining the height of the liquid column in the container.

The device comprises a container 1 filled with liquid 2 (domestic wastewater), in the capacity of the inserted tube 3, the free end 4 provided with a protective grid 5, and its other end 6 is connected with the compressor 7, and the tube is provided with a locking valve 8, which lets air in one direction only when discharge it into the tank. Immediately after the locking valve 8 in the tube 3 has a measuring device 9, such as a pressure gauge.

The device operates as follows. The compressor 7 is pumping air into the container 1 for reliable aerobic process for wastewater treatment by activated sludge, which is always present in the tank 1. The air leaving the free end 4 of the tube 3, AERONET wastewater - the liquid 2, and the pressure gauge 9 shows the pressure with which air is blown. The air in the tank is fed by pulses, i.e. with the interruption, therefore, after the cessation of air compressor is a balance in the tube 3. Excess air from the tube 3 through the free end 4 will be released, its lower part filled with water according to the law of communicating vessels, and the air in the tube from the surface And the water in the tube until the locking valve will be under double pressure: atmospheric Pandand having the value P 2column H of the liquid in the tank 1, i.e. P1=Pand+R2where R1- the air pressure in the tube after cessation of air compressor, Ra- the atmospheric pressure at the surface of the liquid in the vessel, R2- pressure column H of the liquid in the tank, or R2=P1-Randand in turn, the pressure P2post fluid or hydrostatic pressure is equal to R2=dgH, where d is the density of the liquid in the tank, g - acceleration of free fall. Measuring thus the pressure of the air trapped between shutoff valve and column N of the liquid, you can determine the height H of the liquid in the vessel, which will be expressed by the formula

where d is the density of liquid, g is the acceleration of free fall, or

where d is the density of liquid, g is the acceleration of gravity, R1the indications of the measuring instrument, Rand- atmospheric pressure.

Otgravirovany appropriate measuring device, which will show the pressure and correlate with the height H of the liquid column, you can determine the height H of the liquid in the container.

The proposed device is simple in construction, requires no additional equipment, as IP is resultsa the same tools (aeration), which are already present in the system for wastewater treatment, simple in operation and provides remote measurement of the height of the liquid column in the tank.

A device for determining the height of the column of liquid in a tank comprising a container tube, a measuring device and means for supplying air, characterized in that one end of the tube connected to the air compressor, and other outdoor fitted with a protective grid, is located inside the tank at its bottom, while the tube is provided with a locking valve and a measuring device, e.g. pressure gauge, located after the locking valve and the height of the liquid column is determined by the formula:

where d is the density of the liquid,

g - acceleration of free fall,

R1the indications of the measuring instrument,

Ra- atmospheric pressure.



 

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