CN1388356A

CN1388356A - Solid porosity measuring instrument

Info

Publication number: CN1388356A
Application number: CN 02132500
Authority: CN
Inventors: 杨仁政; 郭长武
Original assignee: HAICHENG CITY PETROCHEMICAL INSTRUMENT FACTORY
Current assignee: HAICHENG CITY PETROCHEMICAL INSTRUMENT FACTORY
Priority date: 2002-07-01
Filing date: 2002-07-01
Publication date: 2003-01-01
Anticipated expiration: 2022-07-01
Also published as: CN1190658C

Abstract

The solid porosity measuring instrument is developed based on gas state equation and operates on gas motion. It may be used to measure the porosity of solid in different size and shape simply, fast and accurately. It consists of sample chamber, expansion chamber, connecting pipeline, pressure sensor, measuring circuit, T-valves, vacuum pump, gas cylinder, filter and gas source. It may be used to measure porosity of various solid, and may be used to measure solid volume only.

Description

Solid porosity measuring instrument

Technical field the invention belongs to a kind of instrument of measuring solid porosity.

Background technology is present, in the real work of measuring solid porosity, generally adopt methods such as water logging, poach or other chemical solvent immersions, make the measuring accuracy of factor of porosity low, cycle is long, particularly when measuring the solid of aperture, small gap, because the surface tension effects of liquid, liquid can't be immersed, thereby increased measuring error greatly.In order to increase measuring accuracy, what also have takes the three-dimensional imaging technology, takes this method to make the instrument cost costliness, safeguard and service condition require too high, seldom employing in the actual measurement.The present invention can determine the factor of porosity of all size, shape solid easy, quickly and accurately.

Summary of the invention the present invention has used the equation of gas state, and the method for taking gas to move by accurately measuring solid volume, and then determines the factor of porosity of various solids easily.

The mensuration system is by sample chamber 3, expanding chamber 4, and connecting tube 5, pressure transducer 6, metering circuit 7, T-valve 8,9,10, vacuum pump 11, gas bomb 12, filtrator 13, source of the gas 14 is formed.Sample chamber 3 is connected with expanding chamber 4 by connecting tube 5, T-valve 8, and the other end of T-valve 8 is connected with sensor 6, and the output terminal of sensor 6 is sent into metering circuit 7.Sample chamber 3 also communicates with expanding chamber 4 by another connecting pipe road 5, T-valve 9, the other end of T-valve 9, and the T-valve 10 of leading up to is connected with expanding chamber 4, and the other end of T-valve 10 is connected with vacuum pump 11; Another road communicates with gas bomb 12, and gas bomb 12 links to each other with filtrator 13, and filtrator 13 connects source of the gas 14.

The mensuration process is divided into four steps:

The first step: T-valve 8BC communicates, and A disconnects, and T-valve 9AB communicates, and C disconnects, and T-valve 10AC communicates, and B disconnects.The sample 1 that will have a hole 2 is put into sample chamber 3 and is closed, and opens source of the gas 14, and working gas enters gas bomb 12 after by filtrator 13 dryings, and the AB end by T-valve 9 enters sample chamber 3, makes the pressure of sample chamber 3 equal atmospheric pressure.AC end by T-valve 10 starts vacuum pump 11, and expanding chamber 4 is evacuated.

Second step: T-valve 8BC communicates, and A disconnects, and T-valve 9AB communicates, and C disconnects, and T-valve 10AB communicates, and C disconnects.The working gas that source of the gas is 14 li enters gas bomb 12 after by filtrator 13 dryings, enters expanding chamber 4 by T-valve 10AB end, makes the pressure P in the expanding chamber 4 ₂Slightly equal 0.2P ₀P ₂By T-valve 8BC termination sensor 6, send into metering circuit 7 and detect.With the pressure that sample 1 is pulverized, destroys hole, deoiled, dry back records with reference to said method is P ' ₂

The 3rd step: T-valve 8AB communicates, and C disconnects, and T-valve 9AB communicates, and C disconnects, and T-valve 10A disconnects.Survey the pressure P in the sample chamber 3 ₁, P ₁By T-valve 8AB termination sensor 6, send into metering circuit 7 and detect.With the pressure that sample 1 is pulverized, destroys hole, deoiled, dry back records with reference to said method is P ' ₁

The 4th step: T-valve 8AB communicates, and C disconnects, and T-valve 9AC communicates, and B disconnects, and T-valve 10A disconnects.Sample chamber 3 communicates with the AC end and the expanding chamber 4 of T-valve 9 by connecting tube 5, and two chamber pressure balances are P ₃P ₃By T-valve 8AB termination sensor 6, send into metering circuit 7 and detect.With the pressure that sample 1 is pulverized, destroys hole, deoiled, dry back records with reference to said method is P ' ₃

If: the volume that has the sample 1 of hole 2 is V _x, the net volume that hole destroys back sample 1 is V ' _x, factor of porosity is δ, the volume of sample chamber 3 is V ₁, the volume of expanding chamber 4 is V ₂

Then have:

V_{x} = V_{1} - \frac{P_{3} - P_{2}}{P_{1} - P_{3}} \cdot V_{2}

V_{x}^{'} = V_{1} - \frac{P_{3}^{'} - P_{2}^{'}}{P_{1}^{'} - P_{3}^{'}} \cdot V_{2}

δ = \frac{V_{x} - V_{x}^{'}}{V_{x}} = 1 - \frac{V_{x}^{'}}{V_{x}}

In order to guarantee measuring accuracy, whole measuring system is placed constant temperature system.

The present invention can be widely used in the mensuration of various solid porosities, also can be used for the mensuration of solid volume separately, has that measuring method is easy, analysis speed is fast, the accuracy of detection advantages of higher.

Description of drawings Fig. 1 is the solid porosity measuring instrument synoptic diagram, among the figure: the 1st, sample, the 2nd, hole, the 3rd, sample chamber, the 4th, expanding chamber, the 5th, connecting tube, the 6th, sensor, the 7th, metering circuit, the 8th, T-valve, the 9th, T-valve, the 10th, T-valve, the 11st, vacuum pump, the 12nd, gas bomb, the 13rd, filtrator, the 14th, source of the gas.

Embodiment

Embodiment 1:

The experiment date: on March 10th, 2002

Experiment condition: 45 ℃ of constant temperature.

Embodiment 2:

The mensuration of standard sample volume

The sample piece is the oblate cylinder of φ 59*7.5mm, and appearance is processed through grinding machine, one group 7.This sample piece is V through measurement verification institute verification result _B=145.5159cm ³, this apparatus measures result is V _X=145.55cm ³, error+0.02%.

Embodiment 3:

The stereometry of special pure level (99.99%) sodium chloride

Sodium chloride belongs to cubic crystal, and crystalline form is single, and actual volume is V=73.045cm ³, measurement volumes is V=72.977cm ³, error is+0.208%.

Claims

1, a kind of solid porosity measuring instrument, connecting tube 5 is arranged, pressure transducer 6, metering circuit 7, T-valve 8,9,10, vacuum pump 11, gas bomb 12, filtrator 13, source of the gas 14 is characterized in that: also have sample chamber 3, expanding chamber 4, sample chamber 3 is by connecting tube 5, T-valve 8 is connected with expanding chamber 4, the other end of T-valve 8 is connected with sensor 6, and the output terminal of sensor 6 is sent into metering circuit 7, and sample chamber 3 is also by another connecting pipe road 5, T-valve 9 communicates with expanding chamber 4, the other end of T-valve 9, the T-valve 10 of leading up to is connected with expanding chamber 4, and the other end of T-valve 10 is connected with vacuum pump 11, and another road communicates with gas bomb 12, gas bomb 12 links to each other with filtrator 13, and filtrator 13 connects source of the gas 14.

2, a kind of solid porosity measuring instrument as claimed in claim 1 is characterized in that: in four steps measuring solid porosity: when the first step was placed sample 1: T-valve 8BC communicated, and A disconnects, T-valve 9 AB communicate, C disconnects, and T-valve 10AC communicates, and B disconnects; Expanding chamber 4 internal pressure P are decided in second pacing ₂, P ' ₂The time: T-valve 8BC communicates, and A disconnects, and T-valve 9AB communicates, and C disconnects, and T-valve 10AB communicates, and C disconnects; Sample chamber 3 internal pressure P are decided in the 3rd pacing ₁, P ' ₁The time: T-valve 8AB communicates, and C disconnects, and T-valve 9AB communicates, and C disconnects, and T-valve 10A disconnects; The 4th pacing amount sample chamber 3 and the expanding chamber 4 pressure balanced pressure P that communicates ₃, P ' ₃The time: T-valve 8AB communicates, and C disconnects, and T-valve 9AC communicates, and B disconnects, and T-valve 10A disconnects.

3, a kind of solid porosity measuring instrument as claimed in claim 1 is characterized in that: whole measuring system is placed constant temperature system.