SU859874A1 - Rotary viscometer - Google Patents

Description

one

The invention relates to the study of the rheological properties of liquid two-phase media, in particular, to the determination of the viscosity of the mudflow.

A rotational viscometer is used, which is used to determine the viscosity by the value that balances the tightening torque.

The test substance is placed between the concentrically located "and cylinder". The outer cylinder rotates from the force exerted on it from outside, for example, a motor, and the inner cylinder is twisted by a magnitude determined by the characteristics of the viscometer and the test substance tl due to the stress of friction of the fluid.

However, this viscometer is inconvenient when studying the viscosity of two-phase media.

Closest to the present invention is a viscometer, the measuring chamber of which is an annular pipe rotating around a horizontal axis. When the pipeline rotates, due to the resulting friction against its walls, the slurry rises as the camera rotates.

to a certain height, which is -1 with a viscosity index t2.

The disadvantage of this device is that in the study of a two-phase medium, which includes solid particles up to several tens of centimeters in size, in particular, the mudslide, it is necessary to significantly increase the volume of the measuring chamber {1. The study of such a mixture is favorable. as with the preservation of the principles of the performance of the specified device, its dimensions will increase significantly, since an increase in the volume of the working chamber (due to an increase in the cylinder gap) leads to a corresponding increase in cheniyu diameters larger and smaller cylinders. When rotating the measuring

20 chambers cylinders rotate with equal angular velocities, and since the dimensions of the device are small and the diameters of the cylinders are as close as possible to each other, both cylinders develop approximately the same linear velocity. With an increase in the cylinder gap at the same angular velocity of rotation, both cylinders will develop a different linear velocity.

30 (linear speed of the smaller cylinder

will be less). When a two-phase medium with large solid particles 1 (for example, a mudslip) rotates, in which Koci i is significant, a bias occurs in the surface of the medium under study, which leads to a decrease in the measurement accuracy of the level difference, and consequently, the viscosity of the medium under study. A disadvantage of the device is also the fact that if the dimensions of the roughness of the cylindrical walls of the measuring chamber are smaller than the maximum particles вход of the test mass, like mudflow, boundary effects occur, leading to the body’s slipping on the measuring chamber (movement with core) and the latter leads to large errors when studying the properties of media with a high concentration of the solid component.

The purpose of the invention is to improve the accuracy in measuring the viscosity of two-phase media.

This goal is achieved by the fact that in a rotational viscometer containing a vertically located annular working chamber partially filled with the liquid under study, a drive and measuring system, a vertically arranged annular working chamber is formed by the surfaces of two coaxially mounted cylinders. and end ring-shaped walls fixedly connected to the first cylinder and movably and tightly connected to the second cylinder, and provided with elements of roughness, and the drive further comprises a transmission mechanism connected to the first and second cylinders.

Figure 1 presents the scheme of the rotational viscometer; in Fig.2 a section aa in Fig.1.

The rotational viscometer comprises a body formed by a cylinder 1 and end ring-shaped walls: 2 mounted rotatably around a horizontal axis 3. Coaxially with cylinder 2, cylinder 4 is installed having a smaller diameter. The outer surface of cylinder 4 and inner - cylinder 1 form an annular working chamber 5 of a viscometer, into which a biphasic fluid under study is fed through the loading window b, in particular, the mudflow, half full. The mass level indicator is a sensor 7. Kopnj is mounted on inertia rollers 8, the role of which can be performed by bearings. The cylindrical walls of the working chamber 5 are equipped with special elements of roughness 9.

The end walls 2 are fixedly connected to the edges of the working surface of the cylinder 4, and with the inner surface of the cylinder 1 they form a movable joint, rotating in grooves with sealing rings 10. The drive 11 serves to communicate movement to the cylinders 1 and 4 through the transmission gear 12 which are designed in such a way that the cylinders communicate the same linear velocity.

The device works as follows.

The rotation from the actuator 11 is transmitted through the transmission mechanism 12 to the cylinders 1 and 4, which begin to rotate at the same linear speed in the same direction. The mass loaded into the working chamber is set in motion, and the forces due to the viscosity of the medium under investigation and the corresponding roughness of the walls of chamber 5 result in a shift of the mass under study towards the direction of rotation of cylinders 1 and 4 until they are balanced by gravity pillar of the medium. The surfaces of the mass levels remain almost horizontal, which contributes to an increase in the accuracy of measurement of the level difference, the magnitude of which can be used to judge the viscosity of the mass under study.

The use of the proposed device makes it possible to increase the accuracy of determining the viscosity of the mudflow in the design of engineering structures.

Claims (2)

1. US Patent No. 334960, class C 01 N 11/14, 1967. 2. USSR Author's Certificate No. 637644, C 01 N 11/08, 1977 prototype).