CN1374514A

CN1374514A - Magnetostriction-type densimeter

Info

Publication number: CN1374514A
Application number: CN 02109444
Authority: CN
Inventors: 徐晗
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-04-06
Filing date: 2002-04-06
Publication date: 2002-10-16

Abstract

The present invention relates to liquid density measuring instrument. The magnetostriction type densimeter includes sensor, magnetic density float and hard tube, and its density float with central through hole and around the hard tube can move up and down along the hard tube. It also includes cylinder and chains. The hard tube is set in the center of the cylinder, the internal ends of at least two of the chains are connected to the density float or and the outside ends of the chains are fixed to the inner wall. The chains are distributed evenly around the density float. It can be used to measure various density of liquid inside one sealed container or liquid flowing inside one pipe. It may be set in anywhere inside liquid to measure the density of liquid in any position with less outside effect.

Description

Magnetostriction-type densimeter

Technical field: the present invention relates to a kind of instrument of measuring fluid density.

Background technology: there is following shortcoming in existing densitometer: the one, can not measure the density of liquid in the closed container of filling with liquid and the working fluid in the pipeline; The 2nd, can only measure the density at liquid surface place when measuring, can not measure the density of any place in the liquid; The 3rd, carry and use inconvenience, demarcate once every the several months, otherwise can influence the accuracy of measurement; The 4th, the precision of measuring range low, that be suitable for is little; The 5th, be subjected to ectocine big when measuring.

Summary of the invention: the present invention is a kind of magnetostriction-type densimeter of design, this densitometer has solved can not measuring the working fluid in closed container and the pipeline of existing densitometer existence, and the problem that can not measure the density of liquid internal any place, this densitometer also should have and portably uses conveniently, do not need characteristics such as the precision range high and that be suitable for regularly demarcating, measure is big.The present invention includes the density float 2 and the stereoplasm tube 3 of sensor 1, magnetic, and the density float 2 that the center has a through hole 4 is enclosed within the outside of stereoplasm tube 3, and density float 2 can move up and down along stereoplasm tube 3.The present invention also includes chain 6 and tube 5, and stereoplasm tube 3 is vertically set on tube 5 inside center places, fixedlys connected with density float 2 in the inner of at least two chains 6, and the outer end of chain 6 is connected on the inwall of tube 5, and chain 6 evenly distributes around density float 2.The proportion of above-mentioned chain 6 is made a gesture of measuring greater than fluid to be measured.Chain 6 is the stressed balance that is in around the distribution around the density float 2 makes density float 2.Measuring principle of the present invention is: when the density of fluid to be measured not simultaneously, density float can rise or descend under different buoyancys, the length of the sagging portion of chain l that links to each other with density float 2 also can change.When fluid density was big, float will be to come-up, and it is big that l will become; When fluid density hour, float will be to decline, and l will diminish.The present invention has utilized the variation of l to compensate the float that the variation owing to fluid density causes just and has been subjected to force unbalance.If density of liquid is ρ ₁, the weight of density float is that G, volume are V, and it respectively is F that the pulling force of n bar chain equates, and then the stressed balanced type of density float is: G+nF=ρ ₁Vg ... (1).If the volume of chain unit length is S, quality is m, then the stress balance formula of each chain is mlg=ρ ₁GSl+F ... (2).Get by formula (1) and (2): n (m-ρ ₁S) lg+G=V ρ ₁G, promptly

, above-mentioned variable l can measure density float 2 amounts of moving up and down by sensor 1, calculates then.Densitometer of the present invention is when measuring, and its density float 2 floats under the liquid level, and it can be measured the density of liquid in the closed container of filling with liquid and the working fluid in the pipeline.This densitometer can be put into any position of liquid, so it can measure the density of any place in the liquid.Owing to adopt enclosed construction, be subjected to ectocine little when therefore measuring.This densitometer needn't be demarcated after the demarcation of dispatching from the factory again, has promptly made things convenient for use, has improved the accuracy of measuring again.This densitometer also has the measuring accuracy height, is suitable for the big advantage of range.This densitometric measuring accuracy is 5/10000ths, and sensitivity is 2/10000ths, and measurement range is 0.69～1.2Kg/m ³

Description of drawings: Fig. 1 is the structural representation of embodiment, and Fig. 2 is the C-C cut-open view of Fig. 1.

Embodiment: present embodiment is made up of density float 2, stereoplasm tube 3, tube 5, chain 6, microcomputer 11 and the display 12 of sensor 1, magnetic.Tube 5 is the cylindrical structures that seal up and down, has through hole 5-1 in the upper end of tube 5 sidewalls, has lower through-hole 5-2 in the lower end of tube 5 sidewalls, is provided with plug 5-3 in lower through-hole 5-2, on fluid to be measured can being passed through when measuring in the through hole 5-1 injecting tube 5; Also can pull up plug 5-3, tube 5 is extended in the fluid to be measured, liquid can enter in the tube 5 by lower through-hole 5-2.Stereoplasm tube 3 is vertically set on tube 5 inside center places, and the density float 2 that the center has a through hole 4 is enclosed within the outside of stereoplasm tube 3, and density float 2 can move up and down along stereoplasm tube 3.The chain 6 that is distributed in around the density float 2 is the volume of three length, unit length and the chain that linear mass all equates, it is three Along ent A on the circumference in the center of circle more in the heart that the inner of three chains 6 is separately fixed on the density float 2 with float fulcrum pin ₁, A ₂, A ₃On, the outer end of three chains 6 is fixedly connected on three Along ent B of the sustained height of tube 5 inwalls respectively ₁, B ₂And B ₃On.Sensor 1 is made up of waveguide 7, driver 8, waveguide absorber 9 and housing 10, waveguide absorber 9 be fixedly connected on the tube 5 bottoms above, driver 8 is arranged on housing 10 inside, housing 10 be fixedly connected on the tube 5 tops above, waveguide 7 is arranged on the inside of stereoplasm tube 3, the upper end of waveguide 7 is connected with driver 8, and the lower end of waveguide 7 is connected with waveguide absorber 9.Also have a microcomputer 11 in housing 10, microcomputer 11 is connected with display 12 outside the housing 10 through lead 13.Microcomputer 11 is regularly exported one and decide pulse to driver 8 during work, driver 8 produces a fluctuation electromagnetic field along waveguide 7, the fluctuation electromagnetic field produces difference pulse at density float 2 places of magnetic with the float the action of a magnetic field, this difference pulse does not return along waveguide 7 again, receive by microcomputer 11, thus the upper and lower displacement amount of definite density float 2.

Claims

1, magnetostriction-type densimeter, it includes sensor (1), density float of magnetic (2) and stereoplasm tube (3), the density float (2) that the center has through hole (4) is enclosed within the outside of stereoplasm tube (3), density float (2) can move up and down along stereoplasm tube (3), it is characterized in that it also includes chain (6) and tube (5), stereoplasm tube (3) is vertically set on tube (5) inside center place, fixedly connected with density float (2) in the inner of at least two chains (6), the outer end of chain (6) is connected on the inwall of tube (5), and chain (6) evenly distributes on every side in density float (2).

2, magnetostriction-type densimeter according to claim 1, it is characterized in that tube (5) is the cylindrical structure that seals up and down, upper end at tube (5) sidewall has through hole (5-1), lower end at tube (5) sidewall has lower through-hole (5-2), is provided with plug (5-3) in lower through-hole (5-2).

3, magnetostriction-type densimeter according to claim 1, it is characterized in that being distributed in the chain that volume that density float (2) chain (6) on every side is three length, unit length and linear mass all equate, the inner of three chains (6) is separately fixed at density float (2), and to go up with float fulcrum pin be three Along ent A on the circumference in the center of circle more in the heart ₁, A ₂, A ₃On, the outer end of three chains (6) is fixedly connected on three Along ent B of the sustained height of tube (5) inwall respectively ₁, B ₂And B ₃On.

4, magnetostriction-type densimeter according to claim 1, it is characterized in that sensor (1) is by waveguide (7), driver (8), waveguide absorber (9) and housing (10) are formed, waveguide absorber (9) be fixedly connected on the tube (5) bottom above, driver (8) is arranged on housing (10) inside, housing (10) be fixedly connected on the tube (5) top above, waveguide (7) is arranged on the inside of stereoplasm tube (3), the upper end of waveguide (7) is connected with driver (8), the lower end of waveguide (7) is connected with waveguide absorber (9), also have a microcomputer (11) in housing (10), microcomputer (11) is connected with display (12) outside the housing (10) through lead (13).