CN105092414B - A kind of beam type fluid density meter and its detection method - Google Patents
A kind of beam type fluid density meter and its detection method Download PDFInfo
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- CN105092414B CN105092414B CN201510590785.7A CN201510590785A CN105092414B CN 105092414 B CN105092414 B CN 105092414B CN 201510590785 A CN201510590785 A CN 201510590785A CN 105092414 B CN105092414 B CN 105092414B
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Abstract
The invention discloses a kind of beam type fluid density meter and its detection method, beam type fluid density meter includes housing, measurement pipe, the first bellows, the second bellows, fluid intake flange, fluid issuing flange, cantilever beam, fastener, vibrator and vibration pickup；Detection method is the intrinsic frequency that the system that cantilever beam and measurement pipe and its interior fluid are constituted is obtained by theory of elastic mechanics, then asks for the density of fluid in measurement pipe.The present invention measures the density of fluid by using cantilever beam, influence of the extraneous vibration to fluid density accuracy of detection can not only be eliminated to greatest extent, and accuracy of detection is high, simultaneously, when detecting the density of fluid using the beam type fluid density meter, its accuracy of detection is not influenceed by fluid temperature (F.T.) and pressure change.
Description
Technical field
The invention belongs to fluid density detection technique field, and in particular to a kind of beam type fluid density meter and its detection
Method.
Background technology
The instrument of in the market detection fluid density is varied, mainly there is vibration tube-type fluid density meter, ray type fluid
Densitometer, float-type fluid density meter and static pressure type fluid density meter etc., wherein accuracy of detection are high, stability is strong, detection efficiency
High, the Density Detection instrument of service life length is vibration tube-type fluid density meter, and the Cleaning Principle of this kind of densitometer is vibrating tube
And its internal quality for treating fluid measured and the intrinsic frequency of the system of the two composition have the functional relation of determination, when to vibrating tube
And its it is internal when the system that fluid measured is constituted applies exciting force and it is kept resonance state, by detection, now exciting force swashs
Vibration frequency just can be calculated the density that fluid measured is treated inside vibrating tube by the functional relation determined.In the market major part vibration tube-type
Use and be rigidly connected between the two ends of vibrating tube and fixed mount in fluid density meter --- welding, when vibration tube-type fluid is close
When the extraneous vibration that degree meter is subject to is excessively violent, the vibration of its internal vibration pipe is subject to the influence of extraneous vibration, so that
The density for the fluid that must be detected is inaccurate.
Lv sends out and Zhang little Zhang exists《Single straight tube oscillatory type fluid density meter performance test research》(《Nuclear Power Engineering》, 2012
Year June, the supplementary issue 1,19-22. of volume 33) in propose vibrating tube in a kind of single straight tube oscillatory type fluid density meter, the densitometer
Two ends and fixed mount between use bellows connection, can effectively reduce extraneous vibration to the densitometer accuracy of detection
Influence, still, the Cleaning Principle of this kind of densitometer is still the Cleaning Principle of traditional vibration tube-type fluid density meter, in fact
The core component that now density to fluid is detected is still vibrating tube, although can reduce extraneous vibration to vibration tube vibration
Influence, but the influence for even completely eliminating extraneous vibration to its accuracy of detection can not be significantly reduced, further, since traditional
The core component of the density of vibration tube-type fluid density meter detection fluid is vibrating tube, and when using, traditional vibration tube-type fluid is close
During the density of degree meter detection fluid, in order to ensure the stability of higher accuracy of detection and detected value, vibration tube-type fluid density
Counting internal shape, structure and performance parameters of vibrating tube etc. all should immobilize, however, when the fluid that be detected temperature and
When pressure changes, structure and size of vibrating tube etc. can be caused to occur a certain degree of change, and then influence vibrating tube
Rigidity, eventually results in the accuracy of detection reduction of vibration tube-type fluid density meter, causes the fluid density value appearance of detection larger
Error.
The content of the invention
In order to overcome the shortcomings of above technology, the technical problems to be solved by the invention are the provision of a kind of beam type
Fluid density meter and its detection method, it, which can be significantly reduced, even completely eliminates extraneous vibration, fluid temperature (F.T.) to be measured and pressure
The influences of the factor to fluid density accuracy of detection such as change.
The technical scheme adopted by the invention to solve the technical problem is that：A kind of beam type fluid density meter, its feature
It is, including it is housing, measurement pipe, the first bellows, the second bellows, fluid intake flange, fluid issuing flange, cantilever beam, tight
Be fixedly mounted with put, vibrator and vibration pickup；The housing is to be provided with first through hole in sealed cuboid housing, the left wall of housing, institute
The center of circle for stating first through hole is located on the vertical center line of housing left wall, and the second through hole, described second are provided with the right wall of housing
The center of circle of through hole is located on the vertical center line of housing right wall, the vertical center line of housing left wall and the vertical centre of housing right wall
Line is located in same vertical plane；One end of first bellows is connected by first flange with first through hole, the first ripple
The other end of pipe is connected by one end of second flange and measurement pipe, and one end of second bellows passes through the 3rd flange and the
Two through holes are connected, and the other end of the second bellows is connected by the 4th flange and the other end of measurement pipe；The fluid intake method
Orchid is arranged in housing left wall at first through hole, and fluid intake flange is integrated and coaxial with first through hole with housing,
The fluid issuing flange is arranged on the second through hole in housing right wall, fluid issuing flange be integrated with housing and with
Second through hole is coaxial；The fastener is arranged on the upper wall of housing；The cantilever beam upper end is arranged on fastening through housing
In device, lower end is fixed in measurement pipe, and the axis of cantilever beam passes through the geometric center of fastener and perpendicular to measurement pipe
Axis；Described vibrator and vibration pickup is arranged in housing inner bottom wall, and vibrator and vibration pickup are on measurement pipe pair
Claim to set.
Preferably, the fastener includes preceding fastener, rear fastener and fourth hole, described preceding fastening dress
Put and be bolted with rear fastener, the axis of the fourth hole passes through the geometric center of described fastener and hung down
Directly in the axis of the measurement pipe, the upper end of the cantilever beam is arranged in fourth hole and is interference fitted with fourth hole；Institute
The preceding fastener and rear fastener stated are bolted on the upper wall of housing respectively.
Preferably, the cantilever beam is made up of upper cylinder and lower cylinder, and the upper cylinder is arranged in fastener, described
The upper end of lower cylinder is fixedly connected with the lower end of upper cylinder, and the lower end of lower cylinder is provided with third through-hole；The measurement pipe is through the
Three through holes and with third through-hole be interference fitted.
Preferably, the upper cylinder of the cantilever beam and lower cylinder are integrated, and the diameter of upper cylinder is more than lower circle
The diameter of post.
Preferably, the cantilever beam is the cylinder of rectangle for cross section, and the lower end of cantilever beam passes through clamping device and measurement
Pipe is connected, and the clamping device is bolted on cantilever beam.
Preferably, the clamping device includes the first clamping device and the second clamping device, the first clamping device and second
Clamping device is bolted on cantilever beam, and fifth hole is offered in clamping device, and the measurement pipe is led to through the 5th
Hole and with fifth hole be interference fitted.
Preferably, the rigidity of the housing and fastener is much larger than the rigidity of the cantilever beam.
Preferably, the quantity of the cantilever beam is many, the axle of the cantilever beam of two and more than two quantity along measurement pipe
To direction and on the symmetrical setting of intermediate cross-section plane of measurement pipe.
When a kind of quantity of the cantilever beam of beam type fluid density meter described above is one, the present invention is also carried
A kind of beam type fluid density detection method, it is characterized in that, the detection method includes procedure below：
Using the intersection point of the axis of cantilever beam and the axis of measurement pipe as the origin of coordinates, using the axis of vibrator as x-axis, to survey
The axis of buret is y-axis, and rectangular coordinate system in space is set up using the axis of cantilever beam as z-axis；
The density of fluid and the relational expression of intrinsic frequency are in measurement pipe：
In formula, k is the rigidity of cantilever beam, M be measurement pipe and cantilever beam quality and, ρ is the density of fluid, and d is measurement
The internal diameter of pipe, D is the external diameter of measurement pipe, and l is the length of measurement pipe, and f is made up of cantilever beam and measurement pipe and its interior fluid
The intrinsic frequency of system, α is the relevant constant of the vibration of system with being made up of cantilever beam and measurement pipe and its interior fluid；
After the intrinsic frequency f for measuring the system being made up of cantilever beam and measurement pipe and its interior fluid, intrinsic frequency f is substituted into
The density of fluid in measurement pipe is tried to achieve in measurement pipe in the density of fluid and the relational expression of intrinsic frequency.
When a kind of quantity of the cantilever beam of beam type fluid density meter described above is two and more than two, this
Invention additionally provides a kind of beam type fluid density detection method, it is characterized in that, the detection method includes procedure below：
The cantilever beam of two or more than two are equivalent to a cantilever beam first, then with the detection side of a cantilever beam
Method is detected to fluid density；
Using the intersection point of the axis of equivalent cantilever beam and the axis of measurement pipe as the origin of coordinates, using the axis of vibrator as x-axis,
Using the axis of measurement pipe as y-axis, rectangular coordinate system in space is set up using the axis of equivalent cantilever beam as z-axis；
The density of fluid and the relational expression of intrinsic frequency are in measurement pipe：
In formula, k is the rigidity of equivalent cantilever beam, M be measurement pipe and equivalent cantilever beam quality and, ρ is the density of fluid,
D is the internal diameter of measurement pipe, and D is the external diameter of measurement pipe, and l is the length of measurement pipe, and f is by equivalent cantilever beam and measurement pipe and its interior
Fluid composition system intrinsic frequency, α be and the vibration for the system being made up of equivalent cantilever beam and measurement pipe and its interior fluid
Relevant constant；
After the intrinsic frequency f for measuring the system being made up of equivalent cantilever beam and measurement pipe and its interior fluid, by intrinsic frequency f
Substitute into measurement pipe and the density of fluid in measurement pipe is tried to achieve in the density of fluid and the relational expression of intrinsic frequency.
The beneficial effects of the invention are as follows：The two ends of the measurement pipe of the present invention are connected by a bellows with housing respectively,
Influence of the extraneous vibration to the fluid density meter accuracy of detection can effectively be reduced；Set by the way that the upper end of cantilever beam is fixed on
Put on shell top wall in the through hole of fastener, it is to avoid the extraneous vibration that fluid density meter is subject to causes inside when excessively violent
The influence phenomenon that cantilever vibration of beam is subject to extraneous vibration occurs, so that the density of the fluid of detection is more accurate；
Because the housing of fluid density meter and the rigidity of fastener are much larger than the rigidity of cantilever beam, it is to avoid cantilever beam is with housing and tightly
It is fixedly mounted with to put and produces covibration so that the rigidity of cantilever beam, which changes, ultimately results in the accuracy of detection reduction of fluid density meter
Phenomenon occur.
The present invention measures the density of fluid by using cantilever beam, and extraneous vibration pair can not only be eliminated to greatest extent
The influence of fluid density accuracy of detection, and accuracy of detection is high, meanwhile, detecting fluid using the beam type fluid density meter
Density when, its accuracy of detection is not influenceed by fluid temperature (F.T.) and pressure change.
Brief description of the drawings
Fig. 1 is the arrangement structural representation of the embodiment of the present invention 1；
Fig. 2 is the overlooking the structure diagram of the embodiment of the present invention 1；
Fig. 3 is the main view profile of the embodiment of the present invention 1；
Fig. 4 is the top plan view of the embodiment of the present invention 1；
Fig. 5 is the left view profile of the embodiment of the present invention 1；
Fig. 6 is the enlarged diagram (i.e. 5 times of enlarged drawings in Fig. 3 at B) of the first bellows in Fig. 3；
Fig. 7 is the enlarged diagram (5 times of enlarged drawings) of fastener of the present invention；
Fig. 8 is the structural representation of cantilever beam of the present invention；
Fig. 9 is cantilever beam and clamping device and the connection diagram of measurement pipe when cross section of the present invention is rectangle；
Figure 10 is the structural representation of clamping device of the present invention；
Figure 11 is the arrangement structural representation of the embodiment of the present invention 2；
Figure 12 is the main view profile of the embodiment of the present invention 2；
Figure 13 is the left view profile of the embodiment of the present invention 2；
In figure：1 housing, 2 measurement pipes, 3 first bellowss, 4 second bellowss, 5 fluid intake flanges, 6 fluid issuing methods
Orchid, 7 cantilever beams, fastened before cylinder, 702 times cylinders, 703 third through-holes, 8 fasteners, 801 behind fastener, 802 on 701
Device, 803 fourth holes, 9 vibrators, 10 vibration pickups, 11 first through hole, 12 second through holes, 13 clamping devices, 1,301 first folders
Tight device, 1,302 second clamping devices, 1303 fifth holes.
Embodiment
For the technical characterstic for illustrating this programme can be understood, below by embodiment, and its accompanying drawing is combined, to this hair
It is bright to be described in detail.Following disclosure provides many different embodiments or example is used for realizing the different knots of the present invention
Structure.In order to simplify disclosure of the invention, hereinafter the part and setting of specific examples are described.In addition, the present invention can be with
Repeat reference numerals and/or letter in different examples.This repetition is that for purposes of simplicity and clarity, itself is not indicated
Relation between various embodiments are discussed and/or set.It should be noted that part illustrated in the accompanying drawings is not necessarily to scale
Draw.Present invention omits the description to known assemblies and treatment technology and process to avoid being unnecessarily limiting the present invention.
Embodiment 1
As shown in Figures 1 to 10, a kind of beam type fluid density meter of the invention, it includes housing 1, measurement pipe 2, the
One bellows 3, the second bellows 4, fluid intake flange 5, fluid issuing flange 6, cantilever beam 7, fastener 8, the and of vibrator 9
Vibration pickup 10；The housing 1 is to be provided with first through hole 11, the first through hole in sealed cuboid housing, the left wall of housing
11 center of circle is located on the vertical center line of housing left wall, and the second through hole 12, second through hole 12 are provided with the right wall of housing
The center of circle be located on the vertical center line of housing right wall, the vertical center line position of the vertical center line of housing left wall and housing right wall
In same vertical plane；One end of first bellows 3 is connected by first flange with first through hole 11, the first bellows
3 other end is connected by second flange with one end of measurement pipe 2, one end of second bellows 4 by the 3rd flange with
Second through hole 12 is connected, and the other end of the second bellows 4 is connected by the 4th flange with the other end of measurement pipe 2, by measurement pipe 2
Two ends be connected respectively by a bellows with housing, can effectively reduce extraneous vibration to the fluid density meter detect essence
The influence of degree；The fluid intake flange 5 is arranged in housing left wall at first through hole, and fluid intake flange 5 is one with housing
Body structure and coaxial with first through hole 11, the fluid issuing flange 6 is arranged on the second through hole in housing right wall, and fluid goes out
Mouth flange 6 is integrated and coaxial with the second through hole 12 with housing；The fastener 8 is arranged on the upper wall of housing 1；
The upper end of cantilever beam 7 is arranged in fastener 8 through housing, and lower end is fixed in measurement pipe 2, and the axis of cantilever beam is worn
Cross the geometric center of fastener and perpendicular to the axis of measurement pipe；Described vibrator 9 and vibration pickup 10 is arranged at housing
In inner bottom wall, and vibrator 9 and vibration pickup 10 are symmetrical arranged on measurement pipe.
Preferably, as shown in fig. 7, fastener of the present invention 8 includes preceding fastener 801, rear fastener 802
With fourth hole 803, described preceding fastener 801 and rear fastener 802 is bolted, the fourth hole 803
Geometric center of the axis Jing Guo described fastener and perpendicular to the axis of the measurement pipe 2, the upper end of the cantilever beam 7
It is arranged in fourth hole 803 and is interference fitted with fourth hole；802 points described of preceding fastener 801 and rear fastener
It is not bolted on the upper wall of housing.The present invention is fastened by the way that the upper end of cantilever beam is fixed on setting shell top wall
In the through hole of device, it is to avoid the extraneous vibration that fluid density meter is subject to causes the internal cantilever vibration of beam will when excessively violent
Phenomenon is influenceed by extraneous vibration, so that the density of the fluid of detection is more accurate.
Preferably, as shown in figure 8, cantilever beam of the present invention 7 is made up of upper cylinder 701 and lower cylinder 702, it is described on
Cylinder 701 is arranged in fastener 8, and the upper end of the lower cylinder 702 is fixedly connected with the lower end of upper cylinder, under lower cylinder
End is provided with third through-hole 703；The measurement pipe 2 is interference fitted through third through-hole 703 and with third through-hole.Wherein, it is described outstanding
The upper cylinder 701 of arm beam and lower cylinder 702 are integrated, and diameter of the diameter more than lower cylinder of upper cylinder.
Preferably, as shown in figure 9, cantilever beam of the present invention 7 is the cylinder that cross section is rectangle, under cantilever beam 7
End is connected by clamping device 13 with measurement pipe 2, and the clamping device 13 is bolted on cantilever beam 7.
Preferably, as shown in Figure 10, the clamping device 13 includes the first clamping device 1301 and the second clamping device
1302, the first clamping device 1301 and the second clamping device 1302 are bolted on cantilever beam, are opened up in clamping device
There is fifth hole 1303, the measurement pipe 2 is interference fitted through fifth hole 1303 and with fifth hole.
Preferably, the rigidity of housing 1 and fastener 8 of the present invention is much larger than the rigidity of the cantilever beam 7, due to stream
The housing of volume density meter and the rigidity of fastener are much larger than the rigidity of cantilever beam, it is to avoid cantilever beam and housing and fastener
Covibration is produced so that the rigidity of cantilever beam, which changes, ultimately results in the phenomenon that the accuracy of detection of fluid density meter is reduced
Occur.
It is of the present invention outstanding when a kind of quantity of the cantilever beam of beam type fluid density meter described above is one
The detection method that arm beam type fluid density meter is detected to fluid density includes procedure below：
Using the intersection point of the axis of cantilever beam and the axis of measurement pipe as the origin of coordinates, using the axis of vibrator as x-axis, to survey
The axis of buret is y-axis, and rectangular coordinate system in space is set up using the axis of cantilever beam as z-axis；
The density of fluid and the relational expression of intrinsic frequency are in measurement pipe：
In formula, k is the rigidity of cantilever beam, M be measurement pipe and cantilever beam quality and, ρ is the density of fluid, and d is measurement
The internal diameter of pipe, D is the external diameter of measurement pipe, and l is the length of measurement pipe, and f is made up of cantilever beam and measurement pipe and its interior fluid
The intrinsic frequency of system, α is the relevant constant of the vibration of system with being made up of cantilever beam and measurement pipe and its interior fluid；
After the intrinsic frequency f for measuring the system being made up of cantilever beam and measurement pipe and its interior fluid, intrinsic frequency f is substituted into
The density of fluid in measurement pipe is tried to achieve in measurement pipe in the density of fluid and the relational expression of intrinsic frequency.
Embodiment 2
Cantilever beam 7 of the present invention uses many, when the cantilever beam using two and more than two quantity is along measurement pipe
Axial direction and on measurement pipe intermediate cross-section plane it is symmetrical set.As shown in Figure 11 to Figure 13, in example 2
Illustrated so that cantilever beam 7 is using two as an example.
Described fastener first 4, fastener second 8 and described housing 3 are an entirety, fastener first 4 and tight
The middle longitudinal section for being fixedly mounted with the upper wall for putting second 8 on housing 3 is symmetrical；
As different from Example 1：The quantity of cantilever beam 4 in embodiment 1 is changed to two, corresponding fastening by one
Device 8 is also changed into two from one；Axial direction of two cantilever beams 7 along measurement pipe 2 and on the intermediate cross-section of measurement pipe
Plane is symmetrical to be set, and two fasteners 8 are correspondingly arranged at the top of cantilever beam 7 and in the upper wall of housing 1 respectively
Between longitudinal section plane it is symmetrical.
It is of the present invention when a kind of quantity of the cantilever beam of beam type fluid density meter of the present invention is two
The detection method that beam type fluid density meter is detected to fluid density includes procedure below：
The cantilever beam of two or more than two are equivalent to a cantilever beam first, then with the detection side of a cantilever beam
Method is detected to fluid density；
Using the intersection point of the axis of equivalent cantilever beam and the axis of measurement pipe as the origin of coordinates, using the axis of vibrator as x-axis,
Using the axis of measurement pipe as y-axis, rectangular coordinate system in space is set up using the axis of equivalent cantilever beam as z-axis；
The density of fluid and the relational expression of intrinsic frequency are in measurement pipe：
In formula, k is the rigidity of equivalent cantilever beam, M be measurement pipe and equivalent cantilever beam quality and, ρ is the density of fluid,
D is the internal diameter of measurement pipe, and D is the external diameter of measurement pipe, and l is the length of measurement pipe, and f is by equivalent cantilever beam and measurement pipe and its interior
Fluid composition system intrinsic frequency, α be and the vibration for the system being made up of equivalent cantilever beam and measurement pipe and its interior fluid
Relevant constant；
After the intrinsic frequency f for measuring the system being made up of equivalent cantilever beam and measurement pipe and its interior fluid, by intrinsic frequency f
Substitute into measurement pipe and the density of fluid in measurement pipe is tried to achieve in the density of fluid and the relational expression of intrinsic frequency.
Scheme after above-mentioned change, which also substantially has, effectively eliminates the factors such as extraneous vibration, fluid temperature (F.T.) and pressure change
The advantage of influence to described beam type fluid density meter accuracy of detection.
The present invention not only effectively reduces or eliminated the shadow of extraneous vibration, fluid temperature (F.T.) and pressure change to Density Detection value
Ring, and improve the accuracy of detection to fluid density.
In addition, the application of the present invention is not limited to technique, mechanism, the system of the specific embodiment described in specification
Make, material composition, means, method and step., will be easy as one of ordinary skill in the art from the disclosure
Ground understands, for current technique that is existing or will developing later, mechanism, manufacture, material composition, means, method or
Step, the knot that the function or acquisition that wherein their execution are substantially the same with the corresponding embodiment that the present invention is described are substantially the same
Really, they can be applied according to the present invention.Therefore, appended claims of the present invention are intended to these techniques, mechanism, system
Make, material composition, means, method or step are included in its protection domain.
Claims (10)
1. a kind of beam type fluid density meter, it is characterized in that, including housing, measurement pipe, the first bellows, the second bellows,
Fluid intake flange, fluid issuing flange, cantilever beam, fastener, vibrator and vibration pickup；The housing is sealedly rectangular
First through hole is provided with body shell body, the left wall of housing, the center of circle of the first through hole is located on the vertical center line of housing left wall,
The second through hole is provided with the right wall of housing, the center of circle of second through hole is located on the vertical center line of housing right wall, and housing is left
The vertical center line of wall and the vertical center line of housing right wall are located in same vertical plane；One end of first bellows leads to
Cross first flange to be connected with first through hole, the other end of the first bellows is connected by one end of second flange and measurement pipe, institute
The one end for stating the second bellows is connected by the 3rd flange with the second through hole, the other end of the second bellows by the 4th flange with
The other end connection of measurement pipe；The fluid intake flange is arranged in housing left wall at first through hole, fluid intake flange with
Housing is integrated and coaxial with first through hole, and the fluid issuing flange is arranged on the second through hole in housing right wall,
Fluid issuing flange is integrated and coaxial with the second through hole with housing；The fastener is arranged on the upper wall of housing
On；The cantilever beam upper end is arranged in fastener through housing, and lower end is fixed in measurement pipe, and the axis of cantilever beam is worn
Cross the geometric center of fastener and perpendicular to the axis of measurement pipe；Described vibrator and vibration pickup is arranged at bottom in housing
On wall, and vibrator and vibration pickup are symmetrical arranged on measurement pipe.
2. a kind of beam type fluid density meter according to claim 1, it is characterized in that, the fastener includes preceding tight
Be fixedly mounted with put, rear fastener and fourth hole, described preceding fastener and rear fastener be bolted, the described 4th
Geometric center of the axis of through hole Jing Guo described fastener and perpendicular to the axis of the measurement pipe, the cantilever beam it is upper
End is arranged in fourth hole and is interference fitted with fourth hole；Described preceding fastener and rear fastener pass through spiral shell respectively
Bolt is fixed on the upper wall of housing.
3. a kind of beam type fluid density meter according to claim 1, it is characterized in that, the cantilever beam by upper cylinder and
Lower cylinder composition, the upper cylinder is arranged in fastener, and the upper end of the lower cylinder is fixedly connected with the lower end of upper cylinder,
The lower end of lower cylinder is provided with third through-hole；The measurement pipe is interference fitted through third through-hole and with third through-hole.
4. a kind of beam type fluid density meter according to claim 3, it is characterized in that, the upper cylinder of the cantilever beam and
Lower cylinder is integrated, and diameter of the diameter more than lower cylinder of upper cylinder.
5. a kind of beam type fluid density meter according to claim 1, it is characterized in that, the cantilever beam is for cross section
The cylinder of rectangle, the lower end of cantilever beam is connected by clamping device with measurement pipe, and the clamping device is bolted on outstanding
On arm beam.
6. a kind of beam type fluid density meter according to claim 5, it is characterized in that, the clamping device includes first
Clamping device and the second clamping device, the first clamping device and the second clamping device are bolted on cantilever beam, are clamped
Fifth hole is offered in device, the measurement pipe is interference fitted through fifth hole and with fifth hole.
7. a kind of beam type fluid density meter according to claim 1, it is characterized in that, the housing and fastener
Rigidity is much larger than the rigidity of the cantilever beam.
8. a kind of beam type fluid density meter according to any one of claim 1 to 7, it is characterized in that, the cantilever beam
Quantity be many, axial direction along measurement pipe of the cantilever beam of two and more than two quantity and on horizontal in the middle of measurement pipe
Sectional plane is symmetrical to be set.
9. a kind of beam type fluid density detection method, it is characterized in that, utilize one kind described in any one of claim 1 to 7
Beam type fluid density meter detects that the detection method includes procedure below to fluid density：
Using the intersection point of the axis of cantilever beam and the axis of measurement pipe as the origin of coordinates, using the axis of vibrator as x-axis, with measurement pipe
Axis be y-axis, set up rectangular coordinate system in space using the axis of cantilever beam as z-axis；
The density of fluid and the relational expression of intrinsic frequency are in measurement pipe：
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In formula, k is the rigidity of cantilever beam, M be measurement pipe and cantilever beam quality and, ρ is the density of fluid, and d is measurement pipe
Internal diameter, D is the external diameter of measurement pipe, and l is the length of measurement pipe, and f is the system being made up of cantilever beam and measurement pipe and its interior fluid
Intrinsic frequency, α is the relevant constant of the vibration of system with being made up of cantilever beam and measurement pipe and its interior fluid；
After the intrinsic frequency f for measuring the system being made up of cantilever beam and measurement pipe and its interior fluid, intrinsic frequency f is substituted into and measured
The density of fluid in measurement pipe is tried to achieve in pipe in the density of fluid and the relational expression of intrinsic frequency.
10. a kind of beam type fluid density detection method, it is characterized in that, utilize a kind of beam type described in claim 8
Fluid density meter detects that the detection method includes procedure below to fluid density：
The cantilever beam of two or more than two are equivalent to a cantilever beam first, then come with the detection method of a cantilever beam
Fluid density is detected；
Using the intersection point of the axis of equivalent cantilever beam and the axis of measurement pipe as the origin of coordinates, using the axis of vibrator as x-axis, to survey
The axis of buret is y-axis, and rectangular coordinate system in space is set up using the axis of equivalent cantilever beam as z-axis；
The density of fluid and the relational expression of intrinsic frequency are in measurement pipe：
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<mn>2</mn>
</msup>
<mi>k</mi>
<mo>&CenterDot;</mo>
<mfrac>
<mn>1</mn>
<msup>
<mi>f</mi>
<mn>2</mn>
</msup>
</mfrac>
<mo>-</mo>
<mi>M</mi>
<mo>)</mo>
</mrow>
</mrow>
In formula, k is the rigidity of equivalent cantilever beam, M be measurement pipe and equivalent cantilever beam quality and, ρ is the density of fluid, and d is
The internal diameter of measurement pipe, D is the external diameter of measurement pipe, and l is the length of measurement pipe, and f is by equivalent cantilever beam and measurement pipe and its interior stream
The intrinsic frequency of the system of body composition, α has for the vibration of the system with being made up of equivalent cantilever beam and measurement pipe and its interior fluid
The constant of pass；
After the intrinsic frequency f for measuring the system being made up of equivalent cantilever beam and measurement pipe and its interior fluid, intrinsic frequency f is substituted into
The density of fluid in measurement pipe is tried to achieve in measurement pipe in the density of fluid and the relational expression of intrinsic frequency.
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