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Oil elastic modulus detector based on volume elastic modulus definition

A bulk elastic modulus, elastic modulus technology, applied in measuring devices, using stable tension/pressure to test material strength, using mechanical devices, etc., can solve the problem of difficult pressure wave velocity accurate measurement, high cost and complex system. and other problems, to achieve accurate and reliable measurement results, high degree of automation, and good detection results.

Inactive Publication Date: 2006-07-19
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

A comprehensive analysis of the existing research results at home and abroad shows that when measuring according to the definition of the elastic modulus of oil, there are mainly the following problems: the pressurization process requires manual operation, and it is difficult to realize automatic and online measurement; The sealing performance is very high, and the influence of friction during the pressurization process and the influence of container deformation make it difficult to guarantee the measurement accuracy; automatic replacement of the measured oil is not easy to achieve, and it is difficult to ensure that the measurement results can represent the oil in the hydraulic system the actual situation
When using the indirect measurement method, it is difficult to accurately measure the pressure wave velocity, and then calculate the elastic modulus value of the oil through the conversion relationship between the two, and there must be deviations in the measurement results
This method is complex in system, high in cost and low in precision

Method used

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  • Oil elastic modulus detector based on volume elastic modulus definition
  • Oil elastic modulus detector based on volume elastic modulus definition
  • Oil elastic modulus detector based on volume elastic modulus definition

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with drawings and embodiments.

[0020] As shown in the drawings, the present invention includes: loading cylinder 1, piston and piston rod 2, test chamber 3, check valve 4, pressure sensor 5, built-in displacement sensor 6; The piston rod extends into the test chamber 3 and can move axially in the test chamber 3. The oil inlet P of the check valve 4 1 It communicates with the rod cavity of loading cylinder 1, and the oil outlet T of check valve 4 1 It communicates with the test chamber 3, the pressure sensor 5 communicates with the test chamber 3, the built-in displacement sensor 6 is placed in the piston and the piston rod 2 of the loading cylinder 1, the rodless chamber and the rod chamber of the loading cylinder 1 and the test chamber 3 pass through the tube The roads are respectively connected with the hydraulic system.

[0021] The hydraulic system includes: two-position four-way electromagneti...

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Abstract

The invention discloses an oil liquid elastic modulus tester based on bulk modulus definition. The cylinder rod of the loading cylinder inserts into the test channel to do axial displacement; the oil inlet port of the single direction value is connected with the rod channel of the loading cylinder and the oil outlet port is connected with the test channel; the pressure sensor is connected with the test channel; the built-in type displacement sensor is positioned in the punch and the cylinder rod; the non-rod channel and the rod channel of the loading cylinder and the test channel are separately connected with the liquid pressure system. It uses the loading cylinder to press the oil liquid of the test channel and changes the pressure to obtain the corresponding changing value of the oil liquid volume.

Description

technical field [0001] The invention relates to the detection of physical characteristics of fluid medium, in particular to a detection device for elastic modulus of oil. Background technique [0002] Bulk modulus is an important physical parameter of oil, which directly affects the natural frequency and damping ratio of hydraulic components and hydraulic system, thus affecting stability and dynamic quality. In the dynamic design and calculation of hydraulic components, hydraulic transmission systems, and electro-hydraulic servo systems, especially in the dynamic simulation calculations of hydraulic systems, it is very important to select the bulk modulus of oil reasonably and accurately. The effective bulk modulus of oil can be divided into two parts: the bulk modulus of oil and the elastic modulus of pipelines and accessories, and the former is dominant. Therefore, the research on the compressibility of oil is the field of hydraulic technology. an important subject. The ...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N19/00
Inventor 龚国芳王静杨华勇
Owner ZHEJIANG UNIV
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