RU108514U1 - DEVICE FOR MEASURING THE VOLUME OF AIR IN A HYDRAULIC SYSTEM - Google Patents

Abstract

 A device for measuring the volume of air in a hydraulic system filled with a working fluid with a temperature expansion compensator, comprising a pressure gauge, a drain pipe and a pipe connected to the air cavity of the compensator, and a compressed air source, characterized in that the drain pipe is connected through a valve to a measuring tube for communication with the hydraulic system , the measuring tube is connected with one bend to a manometer and a pipe connected to the air cavity of the compensator, and through a second valve to a source of compressed air a, and the other knee - to the source of compressed air directly.

Description

The utility model relates to measuring technique and can be used to control the quality of filling the closed hydraulic systems with a compensator for temperature expansion with a working fluid.

A device is known (see RF patent No. 201422 dated 06.15.1994 g) for measuring the air volume in a hydraulic system, containing a hydropneumatic accumulator, manometers for measuring pressure in the air and hydraulic cavities, valves with which pressure is created in the air cavity and connected to hydraulic cavities of the inspected object, hydraulic sockets for docking to the inspected object, pipelines.

This device does not allow to measure the volume of air in a hydraulic system with a compensator for thermal expansion.

Closest to the proposed model is a device (see AS No. 591703 dated 07/08/1976) for measuring the air volume, containing a pressure recorder (manometer), a removable drain pipe, a pipe connected to the air cavity of the compensator, and an air pressure source.

However, this device gives a significant error in measuring the air volume in the hydraulic system filled with the working fluid in the presence of a compensator for temperature expansion, since the amount of liquid in the measuring tank changes during the supply of air pressure to the hydraulic and air cavities of the compensator.

The task to which the proposed utility model is directed is to increase the measurement accuracy. This problem is solved in that in a device containing a pressure gauge, a measured U-shaped tube, a drain pipe, a pipe connected to the air cavity of the compensator and an air pressure source, the drain pipe is connected to the meter pipe and the first valve for communication with the hydraulic system, the meter pipe is connected with one bend to the pressure gauge, the pipeline connected to the air cavity of the compensator and through the second valve to the air pressure source, and the other bend - directly to the air pressure source.

The essence of the utility model is illustrated by the drawing, which schematically shows a device for measuring air volume.

The device contains a tested hydraulic system 1, a U-shaped measuring tube 2 connected to a drain pipe 3 through a valve 4. The left elbow of the measuring pipe is connected to a pressure gauge 5, a pipe 6 connected to the air cavity of the compensator 7 and through valve 8 with a source of compressed air. The right bend measuring tube is connected directly to a source of compressed air.

The drain pipe through the valve 4 and the hydraulic connector 9 is connected to the tested hydraulic system. The measuring tube is equipped with a valve 10 to establish in it the initial liquid level.

In the initial position, the valves 4, 8, 10 are closed. The hydraulic system 1 is connected to the pipeline 3 by means of a hydraulic connector 9, while the pipeline 3 and the measuring tube 2 are filled with a working fluid. Then open valve 4, informing the hydraulic system 1 with a measuring tube 2. Set the initial liquid level in the measuring tube using valve 10. Open valve 8 and apply air pressure to the measuring tube 2 and the air cavity of the compensator 7. Under the action of compressed air pressure, the level in the measured tube 2 will decrease if there is air in the fluid-filled hydraulic system. Then close valve 8 and increase the air pressure in the right knee of the measuring tube 2 until the initial level of liquid in the left knee of the measuring tube is restored, take readings of the liquid level in the right knee of the measuring tube and the pressure gauge 5. The air volume in hydraulic system 1 is determined by the formula derived from the Boyle-Mariotte Act:

Where V is the volume of air in the filled hydraulic system;

ΔV is the difference in the volume of liquid in the measuring tube before and after applying air pressure;

ΔP is the excess pressure of the compressed air supplied to the measuring tube;

P is the absolute air pressure in the hydraulic system filled with the working fluid is taken equal to atmospheric pressure.

Using the proposed device provides high measurement accuracy when controlling the quality of filling hydraulic systems with a working fluid, which is important for hydraulic systems that have high requirements for the absence of air in it.

Claims (1)

A device for measuring the volume of air in a hydraulic system filled with a working fluid with a compensator for temperature expansion, containing a manometer, a drain pipe and a pipe connected to the air cavity of the compensator, and a compressed air source, characterized in that the drain pipe is connected through a valve to a measuring tube for communication with the hydraulic system , the measuring tube is connected with one bend to a manometer and a pipe connected to the air cavity of the compensator, and through a second valve to a source of compressed air a, and the other knee - to the source of compressed air directly.