Method and device for measurement of initial shift of liquid in small diameter pipeline

FIELD: measurement equipment.

SUBSTANCE: invention relates to the field of measurement of voltage of initial shift (plasticity) of liquids in pipelines, for example milk in hoses of milking machines. The offered method of measurement of voltage of shift of milk column consists in that using one pressuriser the water column pressure h1 = 20 - 25 mm is pre-set in a glass vessel connected by piping with a differential water manometer and a capillary, and the capillary piping is locked by a clip, and using the second pressuriser the portion of milk is sucked into the capillary to the column length l0 = by 1 - 2 cm, then the pipeline is locked by a clip, the water column h2 = 25 - 30 mm is established, the clip is unlocked. Meanwhile, using a stop watch the time of shift of milk column t1 under the action of h1 pressure is measured, and then the time of shift of the milk column t2 under the action of the pressure h2 is measured. The voltage of initial shift τ0 is determined by the formula τ0=9.8(D/4l0)(t1_t2)(t1/h1-t2/h2), where D - diameter of the capillary, mm. The device for measurement of voltage of shift of milk column contains the pressuriser connected with piping with the differential water manometer and glass vessel to which the horizontally located capillary and the second pressuriser is connected, and the piping from the vessel to the capillary and to the second supercharger is designed with a possibility of locking by a clip.

EFFECT: group of inventions is aimed at decrease of labour costs and improvement of accuracy of determination of voltage of initial shift of controlled liquid.

2 cl, 1 dwg


The invention relates to the field of technology and devices for measuring the voltage of the initial shift (plasticity) of liquids in the pipeline, for example milk in the milking machine hoses.

The purpose of the method and apparatus: control education, air and milk tubes in dairy milking machines hoses and development of measures for their prevention.

The known method of measuring the pressure in the pipeline during transportation of the fluid using the differential pressure sensor, one input of which is connected directly to the pipeline, and the second input is connected via a controllable valve to the pipeline in the same section, remember the pressure is on when the controller valve and measure the pressure change in relation to the stored value of the pressure in the pipeline.

A device for measuring the pressure in the pipeline during transportation of liquid containing one sensor input, which is controlling who is directly connected to the pipeline in a controlled cross-section, and the second input is connected to the same pipeline cross-section through a controllable valve for memorizing the pressure in the pipeline prior to its measurement (prototype EN 2426080 C1, 30/04/2010, G01L 13/02).

Summary of the invention

The invention is directed to a solution to the issue of control and regulation p�of ocesa to exclude the possibility of formation of air-mammary tubes in dairy hoses prevented the flow of milk when milking cows.

As a prototype of the inventive method for measuring the change of pressure in the pipeline during transportation of liquids and device for its implementation, namely the use of a differential sensor.

The disadvantage of the prototype is the impossibility of measuring the time of motion of the liquid and determining the voltage of the initial shift. In addition, the limit of measurement of the pressure change is complex and high labor costs.

The objective of the present method and device is the reduction of labor costs in the measurement, and the simplification and achieving high process accuracy in the measurement of the initial voltage shift of milk in the ducts in the process of milking to exclude the factor of inhibition during its motion.

The technical result of the method and device is the removal of the counter while milking due to the need for increased maintenance work for removing the viscous air and milk tubes.

This technical result is achieved in that in the method base is the movement of the column of milk in the horizontal capillary under the action of the generated constant pressure and time measurement of the motion, and the proposed device consists of a glass tank� with holes in the tube for connection of piping from the supercharger and capillary to create a certain pressure in the vessel, differential water gauge and capillary.

The described device is illustrated by drawings (Fig.1).

The device includes a compressor 2, connected by a piping system with differential pressure gauge 3 and the glass container 1 with tube 7 with two holes for the piping.

With the same capacity is associated horizontal capillary 5 and a blower 6 for installation of the column of liquid in the capillary 5. The pipeline from the tank 1 to the die 5 and the compressor 6 is covered by the clamp 4. In the specified set included stopwatch 8.

The device operates as follows.

By the blower 2 in the glass container 1 is pressurized h1=20...25 mm; h2=20...30 mm water column, measured differential pressure gauge 3. Clip 4 overlaps the tubing to the capillary 5.

By the blower 6 entered by the suction portion of the milk in the capillary 5 and install it in a horizontal position. Introduced volume of milk in the capillary must be a column of fluid of length l0=1...2 cm

Sliding clamp 4. As a result, under the action of pressure h1in the tank 1, the column of milk in the capillary is moved, the duration of the movement t1fixate stopwatch 8. Then measure the time t2shift milk bar under the action of another pressure h2, food�length of its movement is fixed.

The initial shear stress in Pascals is estimated according to the formula


where D is the diameter of the capillary, mm.

This shear stress is equal to tenths of Pascal, but its value makes a significant contribution to the determination of the amount of vacuum pressure in the milk pipeline milking machines.

1. A method of measuring the shear stress of the column of milk, characterized in that it is pre-installed with a single supercharger pressure h1= 20 ... 25 mm water column in the glass container, connected by pipelines with differential pressure gauge and a capillary, and the capillary tubing is covered by the clamp, and using a second supercharger is absorbed into the capillary portion of milk to the length of the column l0= 1 ... 2 cm, after which the pipeline is covered by the clamp, set (h2= 25 ... 30 mm water column, the clamp is moved apart, measure the time-shift milk bar t1under the pressure of the h1fixed stopwatch, and time-shift milk bar t2under the pressure of the h2recorded by stopwatch, and the initial voltage shift of t0is determined by the formula t0=9.8(D/4l0)(t1-t2)(t1/h1-t2/h2), where D is the diameter Kapil�Yar, mm.

2. Device for measuring the shear stress of the column of milk, characterized in that it comprises a blower associated with the piping system with differential pressure gauge and a glass container attached to a horizontal capillary and the second supercharger, and the piping from the tank to the capillary and the second unit is made with the possibility of overlap of the clamp.


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