SU678360A1 - Liquid-column pressure gauge - Google Patents

Description

(54) LIQUID MAYOMETER

one

The invention relates to the field of control and measuring equipment, in particular to pressure measuring devices.

Fluid monitors are known that contain a measuring tube filled with a working fluid, a cup and a scale. The disadvantage of this liquid manometer is the large measurement error that occurs when the ambient temperature changes. The closest solution known is a liquid manometer containing interconnected and filled with the same working fluid measuring tube and chamber of a device for temperature compensation and a scale. The device for temperature compensation is provided with an additional scale, graduated in units of pressure. The disadvantage of the specified liquid manometer is that the temperature correction is entered by calculation as the difference between the readings of the main and additional scales.

The aim of the invention is to provide the possibility of automatic introduction of temperature corrections. The above objective is achieved by the fact that in a liquid manometer containing a tube filled with a working fluid, a scale and a device for temperature compensation, the chamber of which is filled with the same fluid, the chamber is provided with a movable wall associated with a scale made of elastic material. In this case, the chamber is made in the form of a cylinder with a piston measured in it, which is connected with an elastic scale. In addition, it is advisable to make the chamber in the form of a bellows a movable bottom of which is associated with

5 elastic scale.

FIG. 1 shows a diagram of a liquid manometer in which the chamber is made in the form of a cylinder with a piston placed in it} in FIG. 2 0 a manometer in which the camera is made in the form of a bellows.

The pressure gauge has a body 1 with a bowl 2 fixed on it and a measuring tube 3 connected to it, containing 5 working fluid 4. A scale 5 is installed on the body, made of an elastic material. The scale 5 is attached to the lower end of the body 1, and the upper end to the moving wall.

0

cameras. Upper end of the elastic scale

5 and the rod 6 is attached to the piston 7 of the cylinder 8 mounted on the housing 1 and filled with the same fluid as the measuring tube. The sub-piston cavity of the cylinder 8 should be either equal to the length of the scale 5 or shortened by placing the missing part of its volume away from the scale 5 (as shown in FIG. 1) as an additional part 9 which is sealed with the camera fluid. The cylinder 8 (the main part of the chamber) with the additional part 9 is communicated by the nozzle 10, In this form, the pressure gauge is more compact. The additional part 9 of the chamber has a valve 11 for injecting and discharging the liquid, as well as a screw 12 for adjusting the volume of the chamber when adjusting the pressure gauge.

6 has a seal 13 to prevent leakage of fluid from the chamber.

In the manometer shown in FIG. 2, the upper end of the elastic scale 5 by the strings 14 is attached to the lid 15 of the bellows 16 placed in the telescopic direction 17 and mounted on the body 1. The cavity of the bellows 16 is communicated by the nozzle 10 with the additional part 9. and forms with it common, filled with liquid, cameru.

The camera with a movable wall must be filled with a working fluid of a manometer, or another fluid, sufficiently close to the working one in terms of the coefficient of thermal expansion in the range of operating temperatures.

The drawings show a pressure gauge where the camera is placed above the elastic scale 5. However, this camera can be placed on the body and in other places, connecting its movable wall to any of the ends of the elastic scale 5, for example, through blocks or levers.

Due to the fact that the liquids expand more when heated than solid bodies (and the moving-wall chamber is made of solid material and is rigid), the excess fluid 4 from the additional chamber part 9 will flow into the cylinder when heated. 8, raise the piston 7, or into the bellows 16, raise the wing 15 and stretch the elastic scale 5. When the temperature decreases

the environment, the liquid 4 in the chamber will narrow and allow the scale 5 to be reduced by the force of its elasticity.

Kc 1 pensation system forces

the elastic scale 5 is lengthened and shortened with a change in the ambient temperature in the same way as with the stalk of the working fluid 4 in the tube 3.

20

Claims (3)

1..Fluid gauge containing filled with working fluid tube, scale and device for temperature compensation, the chamber of which is filled with the same liquid, characterized in that, in order to provide automatic introducing a temperature correction, the chamber is provided with a movable wall associated with a scale made of an elastic material. 2. The manometer according to claim 1, I distinguish n and with that. What camera is done in the form of a cylinder with a piston placed in it, connected with an elastic scale. 3. A pressure gauge according to claim 1, characterized in that the chamber is made in the form of a bellows, the movable bottom of which is associated with an elastic tongue. 7 / J f -ff / J psh /;