SU1065736A1 - Rotary viscometer - Google Patents

Abstract

ROTARY VISKOSIMETER, containing coaxial outer and two coaxial inner cylinders of the same diameter and different lengths in the case, and the drive, which is the fact that, in order to improve the measurement accuracy, the first inner cylinder is connected to the drive by a hollow shank, and the second - using a roller, settled in the bearings. in the 1st of the first cylinder and passing through the shank coaxially with it, and the outer cylinder is installed in the needle bearings by means of a rocker arm and: connecting to the body with a calibrated spring. (L with

Description

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The invention relates to devices for investigating the rheological properties of liquid media.

A rotational viscometer is known, which contains a naruzkny cylinder with a drive, two internal measuring cylinders arranged coaxially towards each other inside the outer one and equipped with autonomous meters. in torque, the longitudinal movement of the outer cylinder 1J.

The device has one measuring head, but with two independent measuring nodes, as well as a special mechanism for the longitudinal movement of the outer measuring cylinder, which complicates the design of the device and requires an increase in the requirements for the manufacture of identical load cells.

Closest to the technical nature of the proposed rotational viscometer, containing, in the case of external coaxial outer and two coaxial internal cylinder of the same diameter of different lengths and drive. The outer cylinder is a fixed semi-cylindrical tube. A shaft rotating from a mechanical drive and connected to one of the inner cylinders is passed into each end of the tube. of these cylinders is loaded with an autonomous power meter that senses torques 12J,

However, in a known viscometer, measurement accuracy is insufficient due to the presence of two independent measuring units, in addition. the shafts from the measuring nodes (inner cylinders) pass through two seals in the caps of the outer cylinder. It is practically very difficult to make these seals and force measurements the same.

All this can negate the effort to reduce the error associated with the elimination of the effect of end effects on the measurement accuracy. In a known construction, this was achieved by making the sensing element in the form of two coaxial cylinders of the same diameter and different lengths.

The purpose of the invention is to improve the measurement accuracy of the device.

The goal is achieved by the fact that in a rotational viscometer containing coaxial outer and two coaxial inner cylinders of the same diameter and of different lengths in the housing and the drive, the first inner is connected to the drive by a hollow shank, and the second is by a roller.

mounted in bearings inside the first cylinder and passing through its tailpiece coaxially with it, and the outer cylinder is installed in needle bearings by means of rocker arms

and is connected to the housing with a calibrated spring.

With this device design, the total torque is affected only by the difference in lengths of the inner cylinders, and it is difficult to take into account, the influence of friction forces in the bearings of the outer cylinder and the end effects of the lower and upper ends of the inner cylinders are excluded. In addition, the structure provides a more rigorous alignment of the outer and inner cylinders, since the latter are located in close proximity to one another, in one block. In known viscometers, the autonomous installation of internal cylinders makes it difficult to accurately center them,

. The drawing shows the device section.

The viscometer contains a housing 1, inside of which a drive 3 is mounted on the panel 2, consisting of a synchronous two-speed electric motor and gearbox, from which the gears transmit through the gears 4-6 to the measuring internal cylinders 7 and 8 rotating opposite to each other with the same speed, through gears 9 and 10. Measuring internal cylinders 7 and 8 are made of the same diameter and in one block, and the height of the first inner one.

cylinder 7 is less than the height of the second inner cylinder 8, which with the help of a hollow shank 11 is fixed in the central sleeve 12 installed in {wavy bearings

13 cups 14 and driven from the gear wheel 9. To prevent the test liquid from getting into the bearings 13 on the sleeve 12, the casing 15 is pressed into place.

The first inner cylinder 7 with

A roller 16 is installed in bearings 17 fixed by a sleeve 18 in a second inner cylinder 8. A seal 19 is installed to prevent the test liquid from entering the bearings 17 between the inner cylinders 7 and 8. The first inner cylinder 7 and roller 16 are secured with a locking screw. 20. Its drive is carried out by closing the tail part of the roller 16 with the gear wheel 10 by means of a pin 21. The outer cylinder 22 is fixed by a pin 23 in the centering sleeve

Claims (1)

A ROTARY VISCOSIMETER containing in the housing a coaxial outer and two coaxial inner cylinders of the same diameter and different lengths and a drive, which is different in that, in order to increase the measurement accuracy, the first inner cylinder is connected to the drive by a hollow shaft, and the second - using a roller mounted in bearings inside the first cylinder and passing through the shank coaxially with it, and the outer cylinder. mounted in needle bearings by means of a rocker arm and connected to a calibrated spring housing d. yes SI M 00 yes>