CN105910750A - Pumping device impeller dynamic circumference vector force measuring device and method - Google Patents
Pumping device impeller dynamic circumference vector force measuring device and method Download PDFInfo
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- CN105910750A CN105910750A CN201610222518.9A CN201610222518A CN105910750A CN 105910750 A CN105910750 A CN 105910750A CN 201610222518 A CN201610222518 A CN 201610222518A CN 105910750 A CN105910750 A CN 105910750A
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- 238000000034 method Methods 0.000 title claims description 15
- 238000005086 pumping Methods 0.000 title abstract 7
- 239000010453 quartz Substances 0.000 claims abstract description 84
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 84
- 239000013078 crystal Substances 0.000 claims abstract description 29
- 238000013461 design Methods 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 68
- 239000000126 substance Substances 0.000 claims description 66
- 238000009434 installation Methods 0.000 claims description 58
- 230000000694 effects Effects 0.000 claims description 14
- 238000010008 shearing Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
- 230000005622 photoelectricity Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 230000004323 axial length Effects 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000000205 computational method Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 4
- 235000012239 silicon dioxide Nutrition 0.000 description 62
- 239000012530 fluid Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
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- 238000005538 encapsulation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
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- 230000035939 shock Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/08—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of piezoelectric devices, i.e. electric circuits therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A pumping device impeller dynamic circumference vector force measuring device is disclosed and comprises a left flange plate, an upper cover, a pedestal and a right flange plate, wherein the upper cover and the pedestal are arranged between the left flange plate and the right flange plate after being interconnected; a piezoelectric quartz crystal group is arranged between the upper cover and the pedestal; the left flange plate, the upper cover, the pedestal and the right flange plate are in rigid connection with each other to form an integrated structure; the integrated structure and a main shaft of the pumping deice rotate synchronously. The pumping device impeller dynamic circumference vector force measuring device which is simple in structure and good in dynamic characteristic solves a hard problem of how to measure pumping device impeller dynamic circumference vector force and provides reference basis for knowing more about an actual radial stress state of a pumping device impeller and improving safety and reliability of pumping device design.
Description
Technical field:
The present invention relates to a kind of pump installation impeller dynamic circumference vectorial force measurement apparatus and method, belong to and pump class
The internal waterpower radial load of fluid machine blade wheel measures relevant technical field.
Background technology:
In fields such as petrochemical industry, defence and military, nuclear powers, the stability of pump class fluid machinery work and safety
Property is most important.During fluid machine blade wheel work, owing to structure and the impeller internal complex flowfield of pump case cause
Impeller produces radial load, and this radial load makes pump shaft by alternate stress effect, thus produces the amount of deflection of orientation,
Directly influence the job stability of pump shaft.Simultaneously as the effect of radial load can make axle envelope gap become not
Uniformly, pump installation will be caused to leak time serious.Therefore, the radial direction produced for impeller when pump installation designs
Power accounts for being the most necessary.
At present, the radial load size of research pump installation impeller mainly uses empirical equation, numerical simulation, experiment
The methods such as measurement.Although empirical equation comparison of computational results is reliable, but for concrete pump prediction accuracy still
So have much room for improvement.Impeller has obtained good application at simulating analysis based on declared working condition lower stress,
But it is impeller for the instantaneous action power under start and stop, low discharge and variable working condition such as pump installation under complex flowfield
Unsteady Flow Calculation bring sizable difficulty.
In the past used measuring method based on strain-type for measuring of pump installation impeller force in radial, i.e. with
Strain gauge adhesion, as force sensing element, is measured on testing elastic element by foil gauge.Owing to fluid is used to
Property and the instantaneous acceleration transient impact effect to impeller, impeller during the startup of pump installation, low discharge etc.
Interior flow field shows strong non-stationarity and transient effect.Meanwhile, impeller by cavitation in working media,
Flow the high frequency shock loadings such as Induced Oscillation, and the pressure fluctuation caused due to impeller and the stator-rotor interaction of stator
Effect.Therefore, flexible member stress is used to deform upon measuring principle, it is impossible to meet high rigidity, highly sensitive
Degree, the testing requirement of high frequency sound.
Summary of the invention:
Goal of the invention:
The invention provides a kind of pump installation impeller dynamic circumference vectorial force measurement apparatus and method, its objective is
Solve the most existing problem.
Technical scheme:
A kind of pump installation impeller dynamic circumference vectorial force measurement apparatus, including left flange plate, upper cover, base and the right side
Ring flange, upper cover and base are connected with each other and are arranged on afterwards between left flange plate and right ring flange, it is characterised in that:
Being provided with piezoelectric quartz crystalline substance group between upper cover and base, left flange plate, upper cover, base and right ring flange are firm
Property connect, become an overall structure, this overall structure and pump installation main shaft synchronous rotary.
Piezoelectric quartz crystalline substance group is yx cut type piezoelectric quartz crystalline substance group, it makes use of the shearing effect of quartz crystal, often
Individual piezoelectric quartz crystalline substance group is made up of two piezoelectric quartz crystals.
On cover and be provided with the reeded round boss of band, piezoelectric quartz crystalline substance group embeds in groove, groove deep
Degree is the thickness of piezoelectric quartz crystalline substance group so that the exposed surface of piezoelectric quartz crystalline substance group maintain an equal level with boss surface and with
Base is fitted.
Using pretension bolt to be fastenedly connected between upper cover and base, pretension bolt is through the thin-wall circular of upper cover simultaneously
Cylinder and the through hole of piezoelectric quartz crystalline substance group；The axial length of thin cylinder is identical with depth of groove, therefore piezoelectricity stone
Ying Jing group is in the most airtight space, prevents from being contaminated and bringing measure error.
The center superposition in the pretension bolt hole that the center of groove and pretension bolt pass, thin cylinder is arranged on
The center of groove, is provided with in the face that left flange plate and right ring flange are installed with main shaft and matches with main shaft
And for ensureing the outer recessed seam of pump main shaft and measurement apparatus axiality, left flange plate and right ring flange with on
The face that lid is connected with base is provided with for blocking upper cover and base and then guarantee left flange plate, upper cover, base
Indent seam with right ring flange axiality.
This piezoelectric quartz crystalline substance group arranges four altogether；Each piezoelectric quartz crystalline substance group by two panels with rotation direction quartz crystal
Yx cut type quartz wafer is formed in parallel, and four piezoelectric quartz crystalline substance groups use peak response direction orthogonal
Arrangement.
Left flange plate, upper cover, base, right ring flange and piezoelectric quartz crystalline substance group form measurement apparatus, this measurement
Symmetrical structure centered by device, outside entirety presents disc-shape, and its exterior design size can be with pump main shaft
Size and change；The circumferential edges on the surface towards piezoelectric quartz crystalline substance group of upper cover is brilliant to piezoelectric quartz vertically
Prescription is to extending formation cover rim boss, and the boss being used for arranging piezoelectric quartz crystalline substance group is arranged on cover rim
In the range of boss is crowded around and this boss is uniformly distributed centered by the upper cover center of circle, in the footpath of the sidewall of boss sum
On direction, it is respectively designed with through wires hole, between two boss, leaves wiring space, thus four piezoelectric quartzes
The holding wire of brilliant group is outwards drawn by through wires hole.
This measurement apparatus also includes photoelectric whirl encoder；It is equipped with mark line, with this outside described measurement apparatus
Measurement apparatus, as 0 ° of initial position during measurement apparatus static demarcating, is then rotated certain ladder angle by mark line
Degree carries out 360 ° of static demarcatings of circumference, each angle and four piezoelectric quartz crystalline substances in the range of setting up 0 ° to 360 °
The output signal relation of group, mark line and photoelectric whirl encoder with the use of, this this mark line is through photoelectricity
During rotating speed coder, the signal intensity of record photoelectricity rotating speed coder.
The pump installation impeller utilizing above-mentioned pump installation impeller dynamic circumference vectorial force measurement apparatus to be implemented is dynamic
Circumference vectorial force measuring method, it is characterised in that: measurement apparatus is arranged between two disconnected main shafts of pump installation,
By the axiality of outer recessed seam position assurance measurement apparatus Yu main shaft, by outer-hexagonal bolt by left flange plate,
Upper cover, base and right ring flange are rigidly connected, and make measurement apparatus axial, radially without relative displacement；Work as quilt
During the pump installation impeller work surveyed, impeller by waterpower Radial Loads, the now internal piezoelectricity of measurement apparatus
Quartz-crystal group, owing to being produced electric charge by this radial forces, is transmitted to charge amplifier by holding wire,
It is sent in data acquisition module after signal amplifies, after amplification, A/D conversion, obtains radial direction to be measured
Power size；Meanwhile, photoelectric encoder signal is also sent in data acquisition module, by numerical computations,
Obtain the direction of radial load.
Shown in the computational methods such as formula (1) of pump installation impeller dynamic circumference vectorial force:
In formula (1), SrFor the size of radial direction force value, S1、S2、S3、S4It is respectively quartz-crystal group L1、L2、L3、
L4Output signal, θ is the angle between instantaneous moment radial load and quartz-crystal group place plane coordinate system x-axis；
One mark line of the outer ring design of measurement apparatus, mark line is quartz-crystal group place plane coordinate system x-axis
0 ° of direction of angle, uses photoelectric whirl encoder to determine x-axis instantaneous moment position in pump installation main shaft rotary course
Put, thus calculate the impeller radial load space vector power relative to pump installation.
Advantage and effect: in order to study the characteristic of radial load under impeller full working scope, what raising pump installation designed can
By property and security, this paper presents a kind of pump installation impeller dynamic circumference vectorial force measurement apparatus and method,
Advantages of the present invention with good effect is:
1. the measuring method of the present invention realizes high rigidity by left and right ring flange, upper cover with base four part and is connected,
Conducting slip ring is utilized outwards to be exported by the radial load signal of measurement apparatus.Measurement apparatus will by left and right ring flange
Two, the left and right of pump installation off-axis positions and realizes to be rigidly connected.Therefore, measurement apparatus, two, left and right off-axis
It is integrally formed.
2. the measurement apparatus outer shroud of the present invention is designed with a mark line, during pump installation work, uses photoelectricity to turn
Speed encoder gathers this mark line by photoelectric whirl code device signal state, thus obtain radial load signal with
Corresponding relation between the measurement apparatus anglec of rotation.
3. the measurement apparatus of the present invention make use of the shearing effect of piezoelectric quartz crystal, inside to be cut by four yx
Type piezoelectric quartz crystalline substance group is constituted, and each piezoelectric quartz crystalline substance group is in parallel with the yx wafer of rotation direction quartz crystal by two panels
Form.
4. the measurement apparatus dynamometry broad quantum of the present invention, highly sensitive, dynamic characteristic is good, nonlinearity erron and
Repeatability error is little, solves the difficult problem that circumference of impeller vectorial force is measured.
In sum, the piezoelectric quartz crystalline substance group signal of the present invention is outwards drawn by conducting slip ring, accesses electric charge
Amplifier and data acquisition module.The radial load size of impeller is directly measured by measurement apparatus, is counted by theory
Calculation and Analysis and photoelectric whirl encoder auxiliary signal obtain the direction of radial load.Present configuration is simple, dynamically
Characteristic is good, highly sensitive, solves a measurement difficult problem for pump installation impeller dynamic circumference vectorial force, for further
Understanding the actual radial force state of pump installation impeller, the safety and reliability improving pump installation design provides
Reference frame.
Accompanying drawing explanation
Fig. 1 represents an overall structure schematic diagram；
Fig. 2 is internal structure sectional view；
Wherein: 1 is left flange plate, 2 is upper cover, and 3 is base, and 4 is right ring flange, and 5 compile for photoelectric whirl
Code device, A is through hole, and B is outer recessed seam, C pretension bolt hole, and D is screwde on hole, and E is pretension bolt,
F is groove, and G is boss, and H is through hole, and I is outer-hexagonal bolt, and J is hex nut, and K is through hole, L
For quartz-crystal group, M is screwed hole, and N is thin cylinder, and O is piezoelectric quartz crystalline substance group through hole, and P is boss, Q
For indent seam.
Detailed description of the invention:
The present invention is described further below in conjunction with the accompanying drawings:
What the present invention proposed is a kind of pump installation impeller dynamic circumference vectorial force measurement apparatus, including left flange plate 1,
Upper cover 2, base 3 and right ring flange 4, upper cover 2 and base 3 are connected with each other by pretension bolt E and set afterwards
Put between left flange plate 1 and right ring flange 4, it is characterised in that: it is provided with between upper cover 2 and base 3
Piezoelectric quartz crystalline substance group L, wherein, left and right ring flange shape is identical, structure specular, be designed with through hole A,
Outer recessed seam B and indent seam Q, screwde on hole D；Upper cover 2, base 3 are respectively equipped with pretension bolt hole
C and screwed hole M, left flange plate 1, upper cover 2, base 3 and right ring flange 4 are firm by outer-hexagonal bolt I
Property connect, become an overall structure, this overall structure and pump installation main shaft synchronous rotary.
Piezoelectric quartz crystalline substance group L is yx cut type piezoelectric quartz crystalline substance group, it makes use of the shearing effect of quartz crystal,
Each piezoelectric quartz crystalline substance group L is made up of two piezoelectric quartz crystal plate, uses between four piezoelectric quartz crystalline substance groups
The big orthogonal arrangement of sensitive direction.
Piezoelectric quartz crystalline substance group L uses two panels yx cut type piezoelectric quartz crystal plate composition, the thickness of yx cut type quartz wafer
Degree direction is parallel with the y-axis of quartz crystal, and wafer face is vertical with y-axis.This cut type mode make use of quartz-crystal
The shearing effect of body, i.e. impeller are when circumference is in the radial direction by active force, according to piezo-electric effect principle,
The surface of quartz-crystal group produces electric charge, and the axially loaded of impeller does not interferes with measurement result radially.
Being provided with the boss G with fluted F on upper cover 2, piezoelectric quartz crystalline substance group L embeds in groove F, groove
The thickness that the degree of depth is quartz-crystal group so that the exposed surface of piezoelectric quartz crystalline substance group L maintains an equal level with boss G surface
And fit with base 3.
Using pretension bolt E to be fastenedly connected between upper cover 2 and base 3, pretension bolt is through upper cover simultaneously
Thin cylinder N and the through hole O of piezoelectric quartz crystalline substance group L；The axial length of thin cylinder is identical with the groove F degree of depth.
The center superposition of the pretension bolt hole C that the center of groove F and pretension bolt pass, thin cylinder N sets
Put the center at groove F, be provided with in the face that left flange plate 1 and right ring flange 4 and main shaft are installed with
Main shaft matches and merges for ensureing the outer recessed seam B of pump main shaft and measurement apparatus axiality, at left flange plate 1 and
The face that right ring flange 4 is connected with base 3 with upper cover 2 is provided with for blocking upper cover 2 and base 3 and then guarantor
Card left flange plate 1, upper cover 2, base 3 and the indent seam Q of right ring flange 4 axiality.
This piezoelectric quartz crystalline substance group L arranges four altogether；Each piezoelectric quartz crystalline substance group L by two panels with rotation direction quartz-crystal
The yx cut type wafer of body is formed in parallel.
Left flange plate 1, upper cover 2, base 3, right ring flange 4 become measurement apparatus with piezoelectric quartz crystalline substance group L-shaped,
Symmetrical structure centered by this measurement apparatus, outside entirety presents disc-shape, and its exterior design size can be with
The size of pump main shaft and change；The circumferential edges on the surface towards piezoelectric quartz crystalline substance group L of upper cover 2 is vertically
Extend to piezoelectric quartz crystalline substance group L direction and form cover rim boss P, be used for arranging the convex of piezoelectric quartz crystalline substance group L
Platform G be arranged on cover rim boss P crowd around in the range of and this boss G uniformly divide centered by the upper cover center of circle
Cloth.
This measurement apparatus also includes photoelectric whirl encoder 5；Mark line 6 it is equipped with outside described measurement apparatus, should
When mark line is measurement apparatus static demarcating, the x-axis direction of four piezoelectric quartz crystalline substance group place plane coordinate systems is made
0 ° of initial position for the output of measurement apparatus radial load；This mark line 6 coordinates with photoelectric whirl encoder 5 to be made
With, this mark line 6, when photoelectric whirl encoder 5, records the signal intensity of photoelectricity rotating speed coder.
Described outer-hexagonal bolt quantity is eight, is uniformly distributed with measurement apparatus center for the center of circle.Measure dress
Put inside and be provided with four yx cut type piezoelectric quartz crystalline substance groups L, make use of the shearing effect of quartz crystal, Mei Geshi
Ying Jing group L uses the orthogonal arrangement in peak response direction, and piezoelectric quartz crystalline substance group is designed with through hole O,
Through thin cylinder N, the round boss G of upper cover, groove F, the plane of base, piezoelectric quartz crystalline substance group upper
Lower surface is fitted completely.
Described upper cover circumferential edges boss P and round boss G has through wires hole, each described piezoelectric quartz
The output signal line of brilliant group is outwards drawn by this through wires hole.
As shown in Figure 1 and Figure 2, the circumference of impeller vectorial force of the present invention is measured to use and is pacified on the main shaft of pump installation
The method of dress measurement apparatus realizes, and the main shaft of pump installation uses off-axis mode to design, wherein axle two ends
Connecting left flange plate 1 respectively and drive motor, another root axle two ends connect right ring flange 4 and pump installation respectively
Impeller.The two ends of left and right ring flange separately design as seam connected mode for ensureing pump main shaft and measuring dress
Put axiality.Left flange plate 1, upper cover 2, base 3, right ring flange 4 is rigidly connected with main shaft and constitutes one
Overall structure, during pump installation work, this overall structure and impeller synchronous rotary.
The radial direction at round boss G edge is designed with through wires hole.Base 3 is designed as plane disc structure,
It is evenly distributed with four screwed hole M, when upper cover 2 and base 3 assemble, pretension bolt hole C and screwed hole M mono-
One is corresponding.
Four piezoelectric quartz crystalline substance groups L are designed as central through hole structure, during encapsulation, by the center of quartz-crystal group L
Through hole is enclosed within thin cylinder N, and is mutually perpendicular to the peak response direction of piezoelectric quartz crystalline substance group place.
The holding wire of quartz-crystal group is drawn from the through wires hole of round boss G, outwards draws through the boss P of upper cover 2
Go out, by the static demarcating to measurement apparatus can be completed on calibration console, obtain circumference radial load and apply to carry
Linear relationship between the size and Orientation of lotus and four piezoelectric quartz crystalline substance group output signals.The boss P of upper cover 2,
Boss G is 0.01 with the depth of parallelism of the end face plane of base 3, and roughness is 0.4.Four piezoelectric quartz crystalline substances
The flatness of group place groove F plane is 0.02.Thin cylinder N, piezoelectric quartz crystalline substance group L end face with
One horizontal plane, by pretension bolt E1-4Realize and base 3 plane compact siro spinning technology.
Pump installation impeller dynamic circumference vectorial force measuring method, measurement apparatus is arranged on pump installation two and breaks by it
Between main shaft, by the axiality of outer recessed seam B position assurance measurement apparatus Yu main shaft, by outer-hexagonal spiral shell
Left flange plate 1, upper cover 2, base 3 and right ring flange 4 are rigidly connected by bolt I, make measurement apparatus axially,
Radially without relative displacement；When tested pump installation impeller work, impeller by waterpower Radial Loads,
Thus the internal piezoelectric quartz crystalline substance group of measurement apparatus is produced electric charge by radial forces, is transmitted by holding wire
To charge amplifier, it is sent in data acquisition module after signal amplifies, after amplification, A/D conversion
Obtain radial load size to be measured；Meanwhile, photoelectric encoder signal is also sent in data acquisition module,
By numerical computations, obtain the direction of radial load.
Shown in the computational methods such as formula (1) of pump installation dynamic circumference vectorial force.
In formula (1), SrFor the size of radial direction force value, S1、S2、S3、S4It is respectively quartz-crystal group L1、L2、L3、
L4Output signal, θ is between instantaneous moment radial load and piezoelectric quartz crystalline substance group place plane coordinate system x-axis
Angle.
One mark line of the outer ring design of measurement apparatus, this mark line position is as it is shown in figure 1, mark line
For position, 0 ° of plane coordinate system x-axis direction, piezoelectric quartz crystalline substance group place, photoelectric whirl encoder is used to determine pump
X-axis instantaneous moment position in device main shaft rotary course, thus calculate impeller radial load relative to pump installation
Space vector power.
The output signal of measurement apparatus is connected with the conducting slip ring inner ring being arranged on pump installation main shaft, and conduction is sliding
The outer shroud of ring is fixing with pump installation shell to be connected, and outer shroud output signal is sent to number after charge amplifier amplifies
According in acquisition module, this data acquisition module is connected to computer, corresponding with data acquisition module soft
Part carries out showing in real time, analyze, process and preserving of impeller radial load.
The present invention use piezoelectric quartz crystalline substance group as force sensing element, by left and right ring flange, upper cover and base group
Become pump installation impeller motion vector force test system, the method simple in construction, easy to operate, solve at present
A measurement difficult problem for pump installation impeller dynamic circumference vectorial force, for further appreciating that the actual radial direction of pump installation impeller
Stress, the safety and reliability improving pump installation design provides reference frame.
Claims (10)
1. a pump installation impeller dynamic circumference vectorial force measurement apparatus, including left flange plate (1), upper cover (2),
Base (3) and right ring flange (4), upper cover (2) and base (3) are connected with each other and are arranged on left flange afterwards
Between dish (1) and right ring flange (4), it is characterised in that: arrange between upper cover (2) and base (3)
There are piezoelectric quartz crystalline substance group (L), left flange plate (1), upper cover (2), base (3) and right ring flange (4)
It is rigidly connected, becomes an overall structure, this overall structure and pump installation main shaft synchronous rotary.
Pump installation impeller the most according to claim 1 dynamic circumference vectorial force measurement apparatus, its feature exists
In: piezoelectric quartz crystalline substance group (L) is yx cut type piezoelectric quartz crystalline substance group, it makes use of the shearing effect of quartz crystal
Should, each piezoelectric quartz crystalline substance group (L) is made up of two piezoelectric quartz crystals.
Pump installation impeller the most according to claim 2 dynamic circumference vectorial force measurement apparatus, its feature exists
In: being provided with the round boss (G) with fluted (F) on upper cover (2), piezoelectric quartz crystalline substance group (L) is embedding
Entering in groove (F), the degree of depth of groove is the thickness of piezoelectric quartz crystalline substance group so that piezoelectric quartz crystalline substance group (L)
Exposed surface maintains an equal level with boss (G) surface and fits with base (3).
Pump installation impeller the most according to claim 3 dynamic circumference vectorial force measurement apparatus, its feature exists
In: using pretension bolt (E) to be fastenedly connected between upper cover (2) and base (3), pretension bolt is worn simultaneously
Cross the thin cylinder (N) of upper cover and the through hole (O) of piezoelectric quartz crystalline substance group (L)；The axial length of thin cylinder
Spending identical with groove (F) degree of depth, therefore piezoelectric quartz crystalline substance group (L) is in the most airtight space, anti-
Only it is contaminated and brings measure error.
Pump installation impeller the most according to claim 4 dynamic circumference vectorial force measurement apparatus, its feature exists
In: the center superposition in the pretension bolt hole (C) that the center of groove (F) and pretension bolt pass, thin-wall circular
Cylinder (N) is arranged in the center of groove (F), left flange plate (1) and right ring flange (4) with
The face that main shaft is installed is provided with to match with main shaft and merges for ensureing the outer recessed of pump main shaft and measurement apparatus axiality
Seam (B), is connected with base (3) with upper cover (2) at left flange plate (1) and right ring flange (4)
Face be provided with for block upper cover (2) and base (3) so that ensure left flange plate (1), upper cover (2),
The indent seam (Q) of base (3) and right ring flange (4) axiality.
Pump installation impeller the most according to claim 2 dynamic circumference vectorial force measurement apparatus, its feature exists
In: this piezoelectric quartz crystalline substance group (L) arranges four altogether；Each piezoelectric quartz crystalline substance group (L) by two panels with rotation direction stone
The yx cut type quartz wafer of English crystal is formed in parallel, and four piezoelectric quartz crystalline substance groups use peak response direction phase
The most vertical arrangement.
Pump installation impeller the most according to claim 3 dynamic circumference vectorial force measurement apparatus, its feature exists
In: left flange plate (1), upper cover (2), base (3), right ring flange (4) and piezoelectric quartz crystalline substance group (L)
Forming measurement apparatus, symmetrical structure centered by this measurement apparatus, outside entirety presents disc-shape, its external form
Design size can change with the size of pump main shaft；The table towards piezoelectric quartz crystalline substance group (L) of upper cover (2)
The circumferential edges in face extends to piezoelectric quartz crystalline substance group (L) direction vertically and forms cover rim boss (P), uses
The boss (G) of piezoelectric quartz crystalline substance group (L) is set and is arranged in the range of cover rim boss (P) crowds around
And this boss (G) is uniformly distributed centered by the upper cover center of circle, in boss (G) and the radial direction of the sidewall of (P)
It is respectively designed with through wires hole on direction, between two boss, leaves wiring space, thus four piezoelectric quartz crystalline substances
The holding wire of group is outwards drawn by through wires hole.
Pump installation impeller the most according to claim 7 dynamic circumference vectorial force measurement apparatus, its feature exists
In: this measurement apparatus also includes photoelectric whirl encoder (5)；Mark line (6) it is equipped with outside described measurement apparatus,
Using this mark line (6) as 0 ° of initial position during measurement apparatus static demarcating, then measurement apparatus is rotated
Certain ladder angle carries out 360 ° of static demarcatings of circumference, in the range of setting up 0 ° to 360 ° each angle with four
The output signal relation of piezoelectric quartz crystalline substance group, mark line (6) and photoelectric whirl encoder (5) with the use of,
This this mark line (6) is when photoelectric whirl encoder (5), and the signal of record photoelectricity rotating speed coder becomes
Change.
9. utilize the pump that the pump installation impeller dynamic circumference vectorial force measurement apparatus described in claim 8 is implemented
Device impeller dynamic circumference vectorial force measuring method, it is characterised in that: measurement apparatus is arranged on pump installation two
Root breaks between main shaft, by the axiality of outer recessed seam (B) position assurance measurement apparatus Yu main shaft, by outward
Hex bolts (I) is by left flange plate (1), upper cover (2), base (3) and right ring flange (4) rigidity even
Connect, make measurement apparatus axial, radially without relative displacement；When tested pump installation impeller work, impeller
By waterpower Radial Loads, now the internal piezoelectric quartz crystalline substance group of measurement apparatus is due to by this radial effect
Power and produce electric charge, by holding wire transmission to charge amplifier, after signal amplifies, be sent to data acquisition
In collection module, after amplification, A/D conversion, obtain radial load size to be measured；Meanwhile, photoelectric encoder letter
Number it is also sent in data acquisition module, by numerical computations, obtains the direction of radial load.
Pump installation impeller the most according to claim 9 dynamic circumference vectorial force measuring method, its feature
It is: shown in the computational methods such as formula (1) of pump installation impeller dynamic circumference vectorial force:
In formula (1), SrFor the size of radial direction force value, S1、S2、S3、S4It is respectively quartz-crystal group L1、L2、L3、
L4Output signal, θ is the angle between instantaneous moment radial load and quartz-crystal group place plane coordinate system x-axis；
One mark line of the outer ring design of measurement apparatus, mark line is quartz-crystal group place plane coordinate system x-axis
0 ° of direction of angle, uses photoelectric whirl encoder to determine x-axis instantaneous moment position in pump installation main shaft rotary course
Put, thus calculate the impeller radial load space vector power relative to pump installation.
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| CN114199444A (en) * | 2021-11-23 | 2022-03-18 | 内蒙航天动力机械测试所 | Six-component force sensor of solid attitude and orbit control engine |
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| CN105910750B (en) | 2019-04-05 |
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