CN205643073U - Measurement device for fluid density - Google Patents
Measurement device for fluid density Download PDFInfo
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- CN205643073U CN205643073U CN201620348817.2U CN201620348817U CN205643073U CN 205643073 U CN205643073 U CN 205643073U CN 201620348817 U CN201620348817 U CN 201620348817U CN 205643073 U CN205643073 U CN 205643073U
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Abstract
The utility model discloses a measurement device for fluid density. This measuring device includes: friction electric generator sensor, constant -current device and data acquisition and processing device, the friction electric generator sensor includes the vibrating diaphragm that takes place the vibration under the fluid flow effect for be the alternating current signal with the vibration convert who produces, constant -current device is connected with the friction electric generator sensor for the invariable fluidic velocity of flow before the fluid gets into the friction electric generator sensor, the data acquisition and processing device is connected with friction electric generator sensor and constant -current device electricity respectively for the alternating current signal of friction electric generator sensor output and the fluidic velocity of flow signal of telecommunication of constant -current device output are handled in the collection, correspond respectively to obtain vibrating diaphragm vibration frequency and rate of flow of fluid, obtain fluid density according to vibrating diaphragm vibration frequency and rate of flow of fluid. The utility model provides a measurement device for fluid density, the measured flow volume density is accurate reliable in real time, and measuring device is simple, easily operation.
Description
Technical field
This utility model relates to electronic circuit field, is specifically related to the measurement apparatus of a kind of fluid density.
Background technology
Fluid is varied, has the multiple fluid such as gaseous fluid, liquid fluid, and different fluid densities is equal
Differ.When measuring fluid density, special fluid density survey tool can be used, as used specially
The Density Detection instrument convection cell density of door is tested.But, existing Density Detection instrument is often tied
Structure is complicated, and operation requires higher, and most of Density Detection instrument also has higher requirement to environment,
Simple operations cannot can learn fluid density, this is required for professional person and operates.Meanwhile, surveying
When measuring different fluid densities, it is required for different fluids and uses different Density Detection instruments to survey
Amount, this brings trouble greatly also to the work of survey crew.
And owing to existing most of Density Detection instruments need survey crew to carry out substantial amounts of measurement work,
Therefore, the measurement fluid density that it typically can not be real-time, and also also due to Density Detection instrument needs big
The manual operation of amount so that measurement result is inaccurate, there is error.
Utility model content
Goal of the invention of the present utility model is the defect for prior art, it is provided that a kind of fluid density
Measurement apparatus, is used for solving measurement apparatus structure of the prior art complexity, operating difficulties, and can not be real
Time measure fluid density, the problem such as poor accuracy.
This utility model provides the measurement apparatus of a kind of fluid density, including: friction generator sensor,
Constant-current device and data acquisition processing device；Wherein,
Friction generator sensor is included under fluid flow function the vibrating diaphragm that vibration occurs, for flowing
The vibration produced under body mobilization is converted to ac signal；
Constant-current device is connected with friction generator sensor, for sensing at fluid engaging friction electromotor
The flow velocity of constant fluid before device；
Data acquisition processing device electrically connects with friction generator sensor and constant-current device respectively, is used for adopting
Collection processes the ac signal of friction generator sensor output and the flow velocity electricity of the fluid of constant-current device output
Signal, correspondence obtains diaphragm oscillations frequency and rate of flow of fluid respectively, according to diaphragm oscillations frequency and fluid stream
Speed obtains fluid density.
Alternatively, fluid source device, fluid source device and friction generator sensor or constant current dress are also included
Put and be connected, for injecting fluid under the effect of constant-current device in friction generator sensor.
Alternatively, friction generator sensor also includes: shell, electrode, friction plate and vibrating diaphragm fixed mount；
Enclosure is formed and is suitable to the through hole that fluid passes through；Electrode is arranged on the inwall of shell；Friction
Sheet be located at electrode not with on a side surface of the contact internal walls of shell；Vibrating diaphragm fixed mount is erected at the interior of shell
On wall, vibrating diaphragm fixed mount is provided with vibrating diaphragm；
When fluid flows through through hole, vibrating diaphragm occur vibration with friction plate not a side surface with electrode contact connect
Touch wiping and produce ac signal, and exported to data acquisition processing device by electrode.
Alternatively, data acquisition processing device is further used for: according to known proportion coefficient, triboelectricity
Diaphragm oscillations frequency that the physical parameter of machine sensor and acquisition process obtain and rate of flow of fluid, be calculated
Fluid density.
Alternatively, the physical parameter of friction generator sensor includes: vibrating diaphragm density, vibrating diaphragm thickness and shake
Film length.
Alternatively, fluid source device also electrically connects with data acquisition processing device, is further used for: in perseverance
In friction generator sensor, inject the fluid of known density under the effect of stream device, and export known close
The density signal of telecommunication of the fluid of degree is to data acquisition processing device.
Alternatively, data acquisition processing device is further used for: acquisition process fluid source device has exported
Know the density signal of telecommunication of the fluid of density, obtain the density of the fluid of known density.
Alternatively, data acquisition processing device is further used for: according to the density of the fluid of known density,
The physical parameter of friction generator sensor and data acquisition processing device when injecting the fluid of known density
Diaphragm oscillations frequency that acquisition process obtains and rate of flow of fluid, be calculated known proportion coefficient.
Alternatively, fluid source device is controllable pressure compressed air source unit, controllable pressure compressed air source unit respectively with rub
Wipe generating transducer to be connected with constant-current device, also electrically connect with data acquisition processing device, be used for adjusting
The pressure of throttling body, injects the fluid under different pressure by constant-current device in friction generator sensor,
And export the pressure signal of telecommunication of correspondence to data acquisition processing device.
Alternatively, data acquisition processing device is further used for: acquisition process controllable pressure compressed air source unit is defeated
The pressure signal of telecommunication of the fluid under the different pressure gone out, obtains the pressure of fluid under the different pressure of correspondence,
Pressure according to the fluid under different pressure and known physical parameter, be calculated the fluid under different pressure
Density.
Alternatively, it is known that physical parameter includes: ideal gas constant and the thermodynamic temperature of ideal gas.
Alternatively, data acquisition processing device is further used for: according to the density of the fluid under different pressure,
The physical parameter of friction generator sensor and data acquisition process dress when injecting the fluid under different pressure
Put diaphragm oscillations frequency and rate of flow of fluid that acquisition process obtains, be calculated known proportion coefficient.
According to the measurement apparatus of the fluid density that this utility model provides, the fluid at constant flow rate enters and rubs
After wiping generating transducer, the friendship of data acquisition processing device acquisition process friction generator sensor output
The flow velocity signal of telecommunication of the fluid of the stream signal of telecommunication and constant-current device output, correspondence obtains diaphragm oscillations frequency respectively
And rate of flow of fluid, and obtain fluid density according to diaphragm oscillations frequency and rate of flow of fluid.This utility model carries
The measurement apparatus of the fluid density of confession, can measure fluid density in real time, accurately and reliably, and simple in construction,
Easily operated.Simultaneously because its simple in construction, cause its cost of manufacture cheap, be suitable for heavy industrialization
Produce.
Accompanying drawing explanation
The structural representation of the measurement apparatus embodiment one of the fluid density that Fig. 1 provides for this utility model；
Fig. 2 is the longitudinal sectional drawing of the friction generator sensor in Fig. 1；
Fig. 3 is the perspective view of the friction generator sensor in Fig. 1；
The structural representation of the measurement apparatus embodiment two of the fluid density that Fig. 4 provides for this utility model；
The structural representation of the measurement apparatus embodiment three of the fluid density that Fig. 5 provides for this utility model；
The structural representation of the measurement apparatus embodiment four of the fluid density that Fig. 6 provides for this utility model；
The flow chart of the measuring method embodiment of the fluid density that Fig. 7 provides for this utility model.
Detailed description of the invention
For being fully understood by the purpose of this utility model, feature and effect, by following specific embodiment,
This utility model is elaborated, but this utility model is not restricted to this.
The structural representation of the measurement apparatus embodiment one of the fluid density that Fig. 1 provides for this utility model,
As it is shown in figure 1, the measurement apparatus of fluid density, including: friction generator sensor 100, constant-current device
200 and data acquisition processing device 300.Wherein, friction generator sensor 100 is included in fluid flowing
The lower vibrating diaphragm (not shown) that vibration occurs of effect, for by shaking of producing under fluid flow function
Move and be converted to ac signal；Constant-current device 200 is connected with friction generator sensor 100, arranges
In the side of friction generator sensor 100, for fluid engaging friction generating transducer 100 it
The flow velocity of front constant fluid；Data acquisition processing device 300 respectively with friction generator sensor 100 and
Constant-current device 200 electrically connects, for the exchange telecommunications of acquisition process friction generator sensor 100 output
Number and the flow velocity signal of telecommunication of fluid of constant-current device 200 output, respectively correspondence obtain diaphragm oscillations frequency and
Rate of flow of fluid, obtains fluid density according to diaphragm oscillations frequency and rate of flow of fluid.
Fig. 2 is the longitudinal sectional drawing of the friction generator sensor in Fig. 1, and Fig. 3 is the friction in Fig. 1
The perspective view of generating transducer.As shown in Figures 2 and 3, friction generator sensor 100
Including: shell 110, electrode 120, friction plate 130, under fluid flow function, there is the vibrating diaphragm of vibration
140 and vibrating diaphragm fixed mount 150.Wherein, electrode 120, friction plate 130, vibrating diaphragm 140 and vibrating diaphragm are solid
Determine frame 150 and be all disposed within the inside of shell 110.
Specifically, in conjunction with Fig. 1 to Fig. 3, shell 110 is internally formed and is suitable to the through hole 160 that fluid passes through；
Electrode 120 is arranged on the inwall of shell 110；Friction plate 130 be arranged on electrode 120 not with shell 110
Contact internal walls a side surface on；Vibrating diaphragm 140 has fixing end and free end, fixing of vibrating diaphragm 140
End is installed on vibrating diaphragm fixed mount 150, and the free end of vibrating diaphragm 140 vibrates under fluid flow function；
Vibrating diaphragm fixed mount 150 is erected on the inwall of shell 110, wherein, inwall relative of shell 110
Sidewall on be provided with 2 fixed grooves 170, for the fixing vibrating diaphragm fixed mount 150 that sets up in fixed groove
In 170, and then the installation realizing vibrating diaphragm 140 is fixed.When fluid flows through through hole 160, vibrating diaphragm 140
The side surface contact friction that raw vibration does not contacts with electrode 120 with friction plate 130 produces ac signal,
And exported to data acquisition processing device 300 by electrode 120.
It should be noted that, in the structure shown in Fig. 2 and Fig. 3, close with the fixing end of vibrating diaphragm 140
The fluid input port that port is friction generator sensor 100 of friction generator sensor 100, with
The port of the friction generator sensor 100 that the free end of vibrating diaphragm 140 is close is friction generator sensor
The fluid outlet of 100.It is to say, fluid should input from the fluid of friction generator sensor 100
Mouth input, exports from the fluid outlet of friction generator sensor 100, to ensure that friction generator passes
The normal vibration of the vibrating diaphragm 140 of sensor 100.Structure shown in Fig. 2 and Fig. 3 is only friction generator and passes
One concrete example of sensor, this utility model is not limited only to this structure, any former based on triboelectricity
The friction generator sensor of reason is all suitable for this utility model.
When using friction generator sensor, owing to vibrating diaphragm 120 is portion fixing, that will not arbitrarily change
Part, therefore its vibrating diaphragm density, vibrating diaphragm thickness and vibrating diaphragm length are all the numerical value of known fixed, namely friction is sent out
The physical parameter of electromechanical transducer is known fixed.Wherein, the physical parameter of friction generator sensor
Including: vibrating diaphragm density, vibrating diaphragm thickness and vibrating diaphragm length.
Constant-current device 200 is arranged on the side of friction generator sensor 100, as it is shown in figure 1, constant current
Device 200 is arranged on the right side of friction generator sensor 100, at fluid engaging friction electromotor
The flow velocity of constant fluid before sensor 100.Wherein, constant-current device 200 is constant current of the prior art
Device, such as the constant-current device of Stress control rate of flow of fluid, when fluid flowing causes change in flow, constant current
Device automatic pressure regulation controls, with constant fluid flow rate.Those skilled in the art can be real according to reality
Situation of executing, to select suitable constant-current device, does not limits.
It should be noted that, when the measurement apparatus shown in Fig. 1 uses the triboelectricity shown in Fig. 2 and Fig. 3
During machine sensor, if fluid is under the regulation of constant-current device 200 controls, flow into friction generator from left side
Sensor 100 to constant-current device 200, the fluid outlet of friction generator sensor 100 with its on the right side of
The input port of constant-current device 200 is connected；If fluid is under the regulation of constant-current device 200 controls, from the right side
Effluent flows into friction generator sensor 100 after constant-current device 200, friction generator sensor 100
Fluid input port is connected with the delivery outlet of the constant-current device 200 on the right side of it.It is to say, fluid should
Input from the fluid input port of friction generator sensor 100, from the stream of friction generator sensor 100
Body delivery outlet exports, to ensure the normal vibration of the vibrating diaphragm 140 of friction generator sensor 100.
Data acquisition processing device 300 is electric with friction generator sensor 100 and constant-current device 200 respectively
Connect, for ac signal and the constant-current device 200 of the output of acquisition process friction generator sensor 100
The flow velocity signal of telecommunication of the fluid of output, correspondence obtains diaphragm oscillations frequency and rate of flow of fluid respectively, according to shaking
Film frequency of vibration and rate of flow of fluid obtain fluid density.
Data acquisition processing device 300 is further used for: pass according to known proportion coefficient, friction generator
Diaphragm oscillations frequency that the physical parameter of sensor 100 and acquisition process obtain and rate of flow of fluid, be calculated
Fluid density.
Specifically, fluid density and vibrating diaphragm density, vibrating diaphragm thickness, vibrating diaphragm length, diaphragm oscillations frequency and
There is proportionate relationship in rate of flow of fluid, it is known that proportionality coefficient is the coefficient recorded by experiment.Data
Acquisition processing device 300 is after obtaining diaphragm oscillations frequency and rate of flow of fluid, according to data above, utilizes
Equation below can be calculated fluid density:
ρf=K ω2
Κ=κ ρshL/U2
Wherein, ρfFor fluid density, K is known physical parameter, and ω is diaphragm oscillations frequency, and κ is known
Proportionality coefficient, ρsFor vibrating diaphragm density, h is vibrating diaphragm thickness, and L is vibrating diaphragm length, and U is rate of flow of fluid.
According to the measurement apparatus of the fluid density that this utility model provides, the fluid at constant flow rate enters and rubs
After wiping generating transducer, the friendship of data acquisition processing device acquisition process friction generator sensor output
The flow velocity signal of telecommunication of the fluid of the stream signal of telecommunication and constant-current device output, correspondence obtains diaphragm oscillations frequency respectively
And rate of flow of fluid, and obtain fluid density according to diaphragm oscillations frequency and rate of flow of fluid.This utility model carries
The measurement apparatus of the fluid density of confession can measure fluid density in real time, the most reliably, and its simple in construction,
Easily operated.Simultaneously because its simple in construction, cause its cost of manufacture cheap, be suitable for heavy industrialization
Produce.
The structural representation of the measurement apparatus embodiment two of the fluid density that Fig. 4 provides for this utility model.
As shown in Figure 4, on the basis of the embodiment one shown in Fig. 1, the measurement apparatus of fluid density also includes:
Fluid source device 400, fluid source device 400 is connected with constant-current device 200, is arranged on constant-current device
The right side of 200, for injecting stream under the effect of constant-current device 200 in friction generator sensor 100
Body.In order to prevent fluid from situation off and on occurring, can be adjusted by fluid source device 400
Control, to ensure that fluid continues to flow in constant-current device 200, and then continue to flow into friction generator sensing
In device 100.Constant-current device 200 in the measurement apparatus of the fluid density shown in Fig. 4 is from fluid source device
In 400, lasting fluid is sucked with constant flow velocity, make the fluid of constant flow rate flow into friction from right side and send out
In electromechanical transducer 100.
When the measurement apparatus shown in Fig. 4 uses the friction generator sensor shown in Fig. 2 and Fig. 3, by
In fluid under the regulation of constant-current device 200 controls, after right side flows through constant-current device 200, flow into friction
Generating transducer 100, therefore the fluid input port of friction generator sensor 100 and the dress of the constant current on the right side of it
Put the delivery outlet of 200 to be connected.It is to say, fluid passes from friction generator in fluid source device 400
The fluid input port input of sensor 100, exports from the fluid outlet of friction generator sensor 100,
To ensure the normal vibration of the vibrating diaphragm 140 of friction generator sensor 100.
It addition, fluid source device 400 also can electrically connect with data acquisition processing device 300, in perseverance
In friction generator sensor 100, the fluid of known density is injected under the effect of stream device 200, and defeated
Go out the density signal of telecommunication of fluid of known density to data acquisition processing device 300.Data acquisition processing device
The density signal of telecommunication of the fluid of the known density of 300 acquisition process fluid source device 400 outputs, obtains known
The density of the fluid of density.
In addition to above-mentioned difference, the measurement apparatus of the fluid density of the embodiment two shown in Fig. 4 all with Fig. 1 institute
The measurement apparatus of the fluid density of the embodiment one shown is identical, and here is omitted.
The structural representation of the measurement apparatus embodiment three of the fluid density that Fig. 5 provides for this utility model.
The measurement apparatus of the fluid density of the embodiment three shown in Fig. 5 is close with the fluid of the embodiment two shown in Fig. 4
The difference of the measurement apparatus of degree is: fluid source device 400 is connected with friction generator sensor 100,
It is arranged on the left side of friction generator sensor 100.When the measurement apparatus shown in Fig. 5 uses Fig. 2 and Fig. 3
During shown friction generator sensor, owing to fluid is under the regulation of constant-current device 200 controls, from a left side
Side inflow friction generator sensor 100 to constant-current device 200, therefore the stream of friction generator sensor 100
Body delivery outlet is connected with the input port of the constant-current device 200 on the right side of it.It is to say, fluid source device
In 400, fluid inputs from the fluid input port of friction generator sensor 100, from friction generator sensor
The fluid outlet output of 100, to ensure the normal vibration of the vibrating diaphragm 140 of friction generator sensor 100.
In addition to above-mentioned difference, the measurement apparatus of the fluid density of the embodiment three shown in Fig. 5 all with Fig. 4 institute
The measurement apparatus of the fluid density of the embodiment two shown is identical, and here is omitted.
Additionally, the known proportion coefficient in each embodiment above-mentioned is by each embodiment above-mentioned
The fluid of measurement apparatus injection known density records through experiment repeatedly, described in detail below.
When injecting the fluid of known density in the fluid source device 400 shown in Fig. 4 and Fig. 5, stream
The fluid of the known density in body source device 400 can be injected into constant flow velocity by constant-current device 200
In friction generator sensor 100.Now, due to fluid source device 400 and data acquisition processing device
300 electrical connections, therefore can export the density signal of telecommunication of the fluid of known density to data acquisition processing device
300.The fluid of the known density of data acquisition processing device 300 acquisition process fluid source device 400 output
The density signal of telecommunication, obtain the density of the fluid of known density.Therefore, the fluid of known density is being obtained
Density and the vibrating diaphragm of friction generator sensor 100 fix (i.e. vibrating diaphragm density, vibrating diaphragm thickness, vibrating diaphragm
A length of fixing numerical value) in the case of, data acquisition processing device 300 is obtaining diaphragm oscillations frequency
After rate of flow of fluid, according to data above, utilize the formula that embodiment one proposes, meter can be converted further
Calculation obtains known proportion coefficient:
K=ρf/ω2
κ=KU2/ρshL
Wherein, κ is known proportion coefficient, and K is known physical parameter, ρfFor fluid density, ω is vibrating diaphragm
Frequency of vibration, ρsFor vibrating diaphragm density, h is vibrating diaphragm thickness, and L is vibrating diaphragm length, and U is rate of flow of fluid.
According to the measurement apparatus of the fluid density that this utility model provides, experiment can be repeated, enter one
Step calibration correction known proportion coefficient, so that the measurement of convection cell density is more accurate.It is of course also possible to
Directly the density of the fluid of known density is arranged on data acquisition processing device 300 is calculated known
Proportionality coefficient, or the known proportion coefficient after directly determining is arranged on data acquisition processing device 300
In, thus avoid the process of above-mentioned measurement known proportion coefficient.
The structural representation of the measurement apparatus embodiment four of the fluid density that Fig. 6 provides for this utility model.
The measurement apparatus of the fluid density of the embodiment four shown in Fig. 6 is close with the fluid of the embodiment two shown in Fig. 4
The difference of the measurement apparatus of degree is: fluid source device 400 is controllable pressure compressed air source unit.Wherein, may be used
Governor pressure compressed air source unit 400 is connected with friction generator sensor 100 and constant-current device 200 respectively,
Also can electrically connect with data acquisition processing device 300.As shown in Figure 6, friction generator sensor 100
Being arranged in controllable pressure compressed air source unit 400 with constant-current device 200, controllable pressure compressed air source unit 400 carries
The gas of confession can be flow through by the passage that friction generator sensor 100 and constant-current device 200 connect.
Controllable pressure compressed air source unit 400 is for the pressure of regulated fluid, by constant-current device 200 to triboelectricity
The fluid of the constant flow rate under the different pressure of injection in machine sensor 100, and export the pressure telecommunications of correspondence
Number to data acquisition processing device 300.
Data acquisition processing device 300 is further used for: acquisition process controllable pressure compressed air source unit 400 is defeated
The pressure signal of telecommunication of the fluid under the different pressure gone out, obtains the pressure of fluid under the different pressure of correspondence,
Pressure according to the fluid under different pressure and known physical parameter, be calculated the fluid under different pressure
Density.It is known that physical parameter includes: ideal gas constant and the thermodynamic temperature of ideal gas.
Specifically, the pressure P of fluid itself and density pfBetween there is P=ρfRT (ideal gas behavior side
Journey) relation, wherein, R is ideal gas constant, and T is the thermodynamic temperature of ideal gas, namely
Saying, there is linear relationship in pressure and density, can reach to change by changing pressure the purpose of density.Therefore,
According to The Ideal-Gas Equation formula, the density of the fluid can being calculated under different pressure.
Data acquisition processing device is further used for: according to the density of fluid under different pressure, friction
The physical parameter of generating transducer and when injecting the fluid under different pressure data acquisition processing device adopt
Collection processes the diaphragm oscillations frequency and rate of flow of fluid obtained, and is calculated known proportion coefficient.
Known proportion coefficient generally requires and carries out repeatedly test inhabitant area according to practical situation and repair in actual applications
Just, in order to obtain more accurate fluid density, the measurement apparatus shown in embodiment four, root are used
According to The Ideal-Gas Equation P=ρfRT, by change gas pressure intensity to change gas density, and then makes
Record the known proportion coefficient under any density value by equation below, further known proportion coefficient is calibrated
Correction records more accurate gas density:
K=ρf/ω2
κ=KU2/ρshL
Wherein, κ is known proportion coefficient, and K is known physical parameter, ρfFor fluid density, ω is vibrating diaphragm
Frequency of vibration, ρsFor vibrating diaphragm density, h is vibrating diaphragm thickness, and L is vibrating diaphragm length, and U is rate of flow of fluid.
According to the measurement apparatus of the fluid density that this utility model provides, experiment can be repeated, enter one
Step calibration known proportion coefficient, so that the measurement of convection cell density is more accurate.
In addition to above-mentioned difference, the measurement apparatus of the fluid density of the embodiment four shown in Fig. 6 all with Fig. 4 institute
The measurement apparatus of the fluid density of the embodiment two shown is identical, and here is omitted.
It should be noted that, the fluid density measurement device of embodiment one to embodiment three is applicable not only to gas
The measurement of body density, is also applied for the measurement of fluid density；And the fluid density measurement device of embodiment four
It is only applicable to the measurement of gas density.
The flow chart of the measuring method embodiment of the fluid density that Fig. 7 provides for this utility model, such as Fig. 7
Shown in, the method for the present embodiment specifically includes following steps:
Step S101, utilizes constant-current device to inject fluid in friction generator sensor.
Friction generator sensor includes: shell, electrode, friction plate, vibrating diaphragm and vibrating diaphragm fixed mount, when
When having fluid to flow through vibrating diaphragm, vibrating diaphragm can vibrate due to unstability, and the vibrating diaphragm that vibration occurs can be with friction
Sheet contact friction, so that the electrode output AC signal of telecommunication.When using friction generator sensor, by
It is parts fixing, that will not arbitrarily change in vibrating diaphragm, therefore its vibrating diaphragm density, vibrating diaphragm thickness and vibrating diaphragm are long
Degree is all the numerical value of known fixed, namely the physical parameter of friction generator sensor is known fixed.
Wherein, the physical parameter of friction generator sensor includes: vibrating diaphragm density, vibrating diaphragm thickness and vibrating diaphragm length.
Constant-current device is arranged on the side of friction generator sensor, at fluid engaging friction electromotor
The flow velocity of constant fluid before sensor.Constant-current device can use the flow velocity of Stress control fluid, works as stream
When body flowing causes change in flow, constant-current device automatic pressure regulation controls, with constant fluid flow rate.Permanent
Stream device can select suitable constant-current device according to actual performance, does not limits.
Step S102, the diaphragm oscillations output of friction generator sensor in acquisition process fluid injection
Ac signal and the flow velocity signal of telecommunication of fluid of constant-current device output, correspondence obtains diaphragm oscillations respectively
Frequency and rate of flow of fluid.
Data acquisition processing device electrically connects with friction generator sensor and constant-current device, injects at fluid
During can with acquisition process friction generator sensor output ac signal and constant-current device output
The flow velocity signal of telecommunication of fluid, correspondence obtains diaphragm oscillations frequency and rate of flow of fluid respectively.
Step S103, the diaphragm oscillations frequency and the rate of flow of fluid that obtain according to acquisition process obtain fluid density.
Specifically, fluid density and vibrating diaphragm density, vibrating diaphragm thickness, vibrating diaphragm length, diaphragm oscillations frequency and
There is proportionate relationship in rate of flow of fluid, it is known that proportionality coefficient is by repeatedly testing the coefficient recorded.
Data acquisition processing device is according to known proportion coefficient, the physical parameter of friction generator sensor and collection
Process the diaphragm oscillations frequency and rate of flow of fluid obtained, be calculated fluid density.
According to shaking that known proportion coefficient, the physical parameter of friction generator sensor and acquisition process obtain
Film frequency of vibration and rate of flow of fluid, be calculated fluid density and farther include: utilizes equation below to calculate
Obtain fluid density:
ρf=K ω2
Κ=κ ρshL/U2
Wherein, ρfFor fluid density, K is known physical parameter, and ω is diaphragm oscillations frequency, and κ is known
Proportionality coefficient, ρsFor vibrating diaphragm density, h is vibrating diaphragm thickness, and L is vibrating diaphragm length, and U is rate of flow of fluid.
The measuring method of the present embodiment can be applicable to survey in the measurement apparatus of embodiment one to embodiment four
Amount and calculating.According to the measuring method of the fluid density that this utility model provides, at the fluid of constant flow rate
After engaging friction generating transducer, data acquisition processing device acquisition process friction generator sensor is defeated
The ac signal gone out and the flow velocity signal of telecommunication of fluid of constant-current device output, correspondence obtains vibrating diaphragm and shakes respectively
Dynamic frequency and rate of flow of fluid, and obtain fluid density according to diaphragm oscillations frequency and rate of flow of fluid.This practicality
The measuring method of the fluid density of novel offer can measure fluid density in real time, and the most reliably, and it is measured
Method step is simple, be prone to calculating.
The measuring method of the present embodiment is applied in the measurement apparatus of embodiment one, owing to it is not provided with stream
Body source device, therefore can directly the density of the fluid of known density be arranged in data acquisition processing device
It is calculated known proportion coefficient, or the known proportion coefficient after directly determining is arranged on data acquisition
In processing means, thus avoid determining the process of known proportion coefficient.
The measuring method of the present embodiment is applied in the measurement apparatus of embodiment two and embodiment three, in profit
Before injecting fluid with constant-current device in friction generator sensor, the fluid of known density is injected into
In fluid source device, the density signal of telecommunication of the fluid of the known density of acquisition process fluid source device output,
Obtain the density of the fluid of known density.Again by constant-current device by the known density in fluid source device
Fluid is injected in friction generator sensor.The fluid injection of acquisition process known density rubs
The ac signal of the diaphragm oscillations output of generating transducer and the flow velocity electricity of the fluid of constant-current device output
Signal, correspondence obtains diaphragm oscillations frequency and rate of flow of fluid respectively.The density of the fluid according to known density,
The physical parameter (i.e. vibrating diaphragm density, vibrating diaphragm thickness, vibrating diaphragm length) of friction generator sensor and
Know diaphragm oscillations frequency that in the fluid injection of density, data acquisition processing device acquisition process obtains and
Rate of flow of fluid, the formula that Application way embodiment proposes, can convert further and be calculated known proportion system
Number:
K=ρf/ω2
κ=KU2/ρshL
Wherein, κ is known proportion coefficient, and K is known physical parameter, ρfFor fluid density, ω is vibrating diaphragm
Frequency of vibration, ρsFor vibrating diaphragm density, h is vibrating diaphragm thickness, and L is vibrating diaphragm length, and U is rate of flow of fluid.
Alternatively, the measuring method of the present embodiment is applied in the measurement apparatus of embodiment four, is utilizing
Before constant-current device injects fluid in friction generator sensor, inject fluid into controllable pressure source of the gas
Device produces the fluid under different pressure.The different pressure of acquisition process controllable pressure compressed air source unit output
Under the pressure signal of telecommunication of fluid, obtain the pressure of fluid under the different pressure of correspondence, according to difference pressure
The pressure of the fluid under Qiang and known physical parameter (the i.e. thermodynamics temperature of ideal gas constant and ideal gas
Degree), the density of the fluid being calculated under different pressure.
By constant-current device, the fluid under different pressure is injected in friction generator sensor, at collection
The alternating current of the diaphragm oscillations output of friction generator sensor in fluid injection under the different pressure of reason
The flow velocity signal of telecommunication of the fluid of signal and constant-current device output, correspondence obtains diaphragm oscillations frequency and stream respectively
Rate of flow of fluid.According to the density of fluid under different pressure, the physical parameter of friction generator sensor and
The diaphragm oscillations frequency that in fluid injection under different pressure, data acquisition processing device acquisition process obtains
Rate and rate of flow of fluid, the computing formula with reference to above-mentioned known proportion coefficient is calculated known proportion coefficient.
Known proportion coefficient generally requires and carries out repeatedly test inhabitant area according to practical situation and repair in actual applications
Just, in order to obtain more accurate fluid density, the device of embodiment four is used, by constant-current device
It is placed in the controllable pressure compressed air source unit that a controlled pressing pressure changes with friction generator sensor.Due to
Gas pressure intensity P and gas density ρfThere is P=ρfRT (The Ideal-Gas Equation), i.e. gas pressure intensity
Linear relationship is there is, it is possible to reach to change gas density by changing gas pressure intensity with gas density
Purpose, thus record the known proportion coefficient under any density value, and then to known proportion coefficient correction school
Standard records more accurate gas density.
According to the measuring method of the fluid density that this utility model provides, experiment can be repeated, enter one
Step calibration correction known proportion coefficient, so that the measurement of convection cell density is more accurate.
The various modules that are previously mentioned in this utility model, circuit are all for by hard-wired circuit, although its
Middle certain module, circuit are integrated with software, but this utility model claimed be that integrated software is corresponding
The hardware circuit of function, and it is not only software itself.
It should be appreciated by those skilled in the art that the apparatus structure shown in accompanying drawing or embodiment is only signal
Property, represent logical structure.The module wherein shown as separating component is probably or is not likely to be thing
In reason separate, the parts shown as module are probably or are not likely to be physical module.
Finally it should be noted that: listed above is only specific embodiment of the utility model, when
So this utility model can be modified and modification by those skilled in the art, if these amendments and change
Type belongs within the scope of this utility model claim and equivalent technologies thereof, is all considered as this practicality new
The protection domain of type.
Claims (12)
1. the measurement apparatus of a fluid density, it is characterised in that including: friction generator sensor,
Constant-current device and data acquisition processing device；Wherein,
Described friction generator sensor is included under fluid flow function the vibrating diaphragm that vibration occurs, and being used for will
The vibration produced under fluid flow function is converted to ac signal；
Described constant-current device is connected with described friction generator sensor, rubs described in entering at fluid
The flow velocity of constant fluid before wiping generating transducer；
Described data acquisition processing device is electric with described friction generator sensor and described constant-current device respectively
Connect, for ac signal and the described constant current dress of friction generator sensor output described in acquisition process
Putting the flow velocity signal of telecommunication of the fluid of output, correspondence obtains diaphragm oscillations frequency and rate of flow of fluid respectively, according to
Described diaphragm oscillations frequency and described rate of flow of fluid obtain fluid density.
The measurement apparatus of fluid density the most according to claim 1, it is characterised in that also include stream
Body source device, described fluid source device is connected with described friction generator sensor or described constant-current device,
In described friction generator sensor, fluid is injected under the effect at described constant-current device.
The measurement apparatus of fluid density the most according to claim 1, it is characterised in that described friction
Generating transducer also includes: shell, electrode, friction plate and vibrating diaphragm fixed mount；
Described enclosure is formed and is suitable to the through hole that fluid passes through；Described electrode is arranged on described shell
On inwall；Described friction plate be located at described electrode not with on a side surface of the contact internal walls of described shell；
Described vibrating diaphragm fixed mount is erected on the inwall of described shell, described vibrating diaphragm fixed mount is provided with described in shake
Film；
When fluid flows through described through hole, described vibrating diaphragm occur vibration with described friction plate not with described electrode
The side surface contact friction of contact produces ac signal, and by the output of described electrode to described data
Acquisition processing device.
The measurement apparatus of fluid density the most according to claim 2, it is characterised in that described data
Acquisition processing device is further used for: according to known proportion coefficient, the thing of described friction generator sensor
Reason parameter and the described diaphragm oscillations frequency that obtains of acquisition process and described rate of flow of fluid, be calculated described
Fluid density.
The measurement apparatus of fluid density the most according to claim 4, it is characterised in that described friction
The physical parameter of generating transducer includes: vibrating diaphragm density, vibrating diaphragm thickness and vibrating diaphragm length.
6. according to the measurement apparatus of the fluid density described in claim 4 or 5, it is characterised in that described
Fluid source device also electrically connects with described data acquisition processing device, is further used for: fill in described constant current
In described friction generator sensor, the fluid of known density is injected under the effect put, and described in exporting
Know that the density signal of telecommunication of fluid of density is to described data acquisition processing device.
The measurement apparatus of fluid density the most according to claim 6, it is characterised in that described data
Acquisition processing device is further used for: the fluid of the known density of fluid source device output described in acquisition process
The density signal of telecommunication, obtain the density of the fluid of described known density.
The measurement apparatus of fluid density the most according to claim 7, it is characterised in that described data
Acquisition processing device is further used for: according to the density of fluid of described known density, described triboelectricity
The physical parameter of machine sensor and described data acquisition processing device when injecting the fluid of described known density
Diaphragm oscillations frequency that acquisition process obtains and rate of flow of fluid, be calculated described known proportion coefficient.
9. according to the measurement apparatus of the fluid density described in claim 4 or 5, it is characterised in that described
Fluid source device is controllable pressure compressed air source unit, and described controllable pressure compressed air source unit is sent out with described friction respectively
Electromechanical transducer is connected with described constant-current device, also electrically connects with described data acquisition processing device, uses
In the pressure of regulated fluid, in described friction generator sensor, inject difference by described constant-current device
Fluid under pressure, and export the pressure signal of telecommunication of correspondence to described data acquisition processing device.
The measurement apparatus of fluid density the most according to claim 9, it is characterised in that described number
It is further used for according to acquisition processing device: the different pressures of controllable pressure compressed air source unit output described in acquisition process
The pressure signal of telecommunication of the fluid under Qiang, obtains the pressure of fluid under the different pressure of correspondence, according to described
The pressure of the fluid under different pressure and known physical parameter, the fluid being calculated under different pressure close
Degree.
The measurement apparatus of 11. fluid densities according to claim 10, it is characterised in that described
Know that physical parameter includes: ideal gas constant and the thermodynamic temperature of ideal gas.
12. according to the measurement apparatus of the fluid density described in claim 10 or 11, it is characterised in that
Described data acquisition processing device is further used for: according to the density of fluid under described different pressure, institute
Described data when stating the physical parameter of friction generator sensor and inject the fluid under described different pressure
Diaphragm oscillations frequency that acquisition processing device acquisition process obtains and rate of flow of fluid, be calculated described known
Proportionality coefficient.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620348817.2U CN205643073U (en) | 2016-04-22 | 2016-04-22 | Measurement device for fluid density |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620348817.2U CN205643073U (en) | 2016-04-22 | 2016-04-22 | Measurement device for fluid density |
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|---|---|
| CN205643073U true CN205643073U (en) | 2016-10-12 |
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| CN201620348817.2U Withdrawn - After Issue CN205643073U (en) | 2016-04-22 | 2016-04-22 | Measurement device for fluid density |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987859A (en) * | 2016-04-22 | 2016-10-05 | 纳智源科技（唐山）有限责任公司 | Measurement apparatus and method for fluid density |
| CN108760968A (en) * | 2018-03-27 | 2018-11-06 | 佛山市飞程信息技术有限公司 | A kind of automobile emission gas analyzer gas sensor |
| CN114112792A (en) * | 2021-11-17 | 2022-03-01 | 江苏科技大学 | Fluidized slurry processing system and instantaneous density detection device and method thereof |
-
2016
- 2016-04-22 CN CN201620348817.2U patent/CN205643073U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105987859A (en) * | 2016-04-22 | 2016-10-05 | 纳智源科技（唐山）有限责任公司 | Measurement apparatus and method for fluid density |
| CN105987859B (en) * | 2016-04-22 | 2018-07-17 | 纳智源科技（唐山）有限责任公司 | The measuring device and method of fluid density |
| CN108760968A (en) * | 2018-03-27 | 2018-11-06 | 佛山市飞程信息技术有限公司 | A kind of automobile emission gas analyzer gas sensor |
| CN114112792A (en) * | 2021-11-17 | 2022-03-01 | 江苏科技大学 | Fluidized slurry processing system and instantaneous density detection device and method thereof |
| CN114112792B (en) * | 2021-11-17 | 2023-11-21 | 江苏科技大学 | Fluid slurry treatment system and instantaneous density detection device and method thereof |
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Granted publication date: 20161012 Effective date of abandoning: 20180717 |