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Rotational viscometer

A rotational viscometer, rotational speed technology, applied in the direction of flow characteristics, measuring devices, instruments, etc., can solve the problems of distorted, complicated, and limited measurement range of measurement results, and achieve the effect of eliminating distorted, compact and sensitive structures

Inactive Publication Date: 2012-10-03
安东帕有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such support structures generally lead to distortion of the measurement results by bearing friction
The use of as friction-free bearings as possible, such as pivot bearings, makes the measuring instrument expensive and complicated
In addition, the measuring range of these instruments is limited, since only an angular resolution matching the spring constant of the respective spring used can be measured

Method used

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  • Rotational viscometer

Examples

Experimental program
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Embodiment Construction

[0039] exist figure 1 The rotational viscometer shown schematically in has a unit with a drive motor 1 and a measuring shaft 25 driven by the drive motor 1 . In its region close to the electric motor, the measuring shaft 25 comprises a shaft part 9 connected to the electric motor, which carries the twistable element 2 . The element 2 carries the underlying shaft part 10 , which in turn carries the measuring part 3 . Measuring sensor parts 17 , 18 are arranged above and below the twistable element 2 . The upper measuring sensor part 17 carries a transmitter 22 with which measured values ​​relating to the twisting of the twistable element 2 or the upper and lower measuring parts relative to one another are transmitted to an evaluation receiver. Unit 13. During the measurement, the electric motor 1 turns the measuring shaft 25 at a predetermined rotational speed. Due to the friction exerted by the sample on the measuring part 3 due to its viscosity, said measuring part 3 lags...

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Abstract

The invention relates to a rotational viscometer, comprising a measuring shaft (25) that can be rotated at a specified rotational speed, a measuring part (3) that is carried by said measuring shaft and that can be lowered into a sample, and a detection unit for determining the angle of twist of the measuring part (3) relative to the driven part of the measuring shaft (25).; According to the invention, a twistable element (2) is inserted into the measuring shaft (25), preferably in the section of the measuring shaft close to the motor, the detection unit (17, 18, 24) is moved along with the shaft and determines the relative twist or the angle of twist between the shaft part (9) located on the motor side relative to the twistable element (2) and the shaft part (10) located on the measuring-part side, and the output signals of the detection unit (17, 18, 24) are fed to an evaluation device (13) as the basis for determining the viscosity of the sample.

Description

technical field [0001] The invention relates to a rotational viscometer according to the preamble of claim 1 . Background technique [0002] With rotational viscometers, the viscosity of a sample is determined with sufficient accuracy over a wide measuring range by rotation of the measuring part in any measuring vessel below the viscometer containing the sample. [0003] Such a viscometer is proposed, for example, according to ASTM D2983 for testing lubricants in the automotive industry and is known in principle as a Brookfield viscometer from document US 2,679,750. [0004] In this case, the viscosity of the sample is determined by the rotation of standardized measuring components in the sample to be measured. Measuring components are known, for example, from ASTM D5133-96. [0005] The measuring part is usually fastened in a detachable and thus replaceable manner on a measuring shaft which is rotated by an electric motor, is immersed in the sample and is brought into rot...

Claims

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Application Information

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IPC IPC(8): G01N11/14
CPCG01N11/14
Inventor G.拉费尔
Owner 安东帕有限责任公司
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