CN108981836A - A kind of measuring room component of graphite blade flowmeter - Google Patents
A kind of measuring room component of graphite blade flowmeter Download PDFInfo
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- CN108981836A CN108981836A CN201811109299.9A CN201811109299A CN108981836A CN 108981836 A CN108981836 A CN 108981836A CN 201811109299 A CN201811109299 A CN 201811109299A CN 108981836 A CN108981836 A CN 108981836A
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- curve
- measuring room
- graphite
- scraper plate
- cylindrical core
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
- G01F11/10—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation
- G01F11/12—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements
- G01F11/20—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates
- G01F11/22—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with measuring chambers moved during operation of the valve type, i.e. the separating being effected by fluid-tight or powder-tight movements wherein the measuring chamber rotates or oscillates for liquid or semiliquid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/006—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus characterised by the use of a particular material, e.g. anti-corrosive material
Abstract
The invention discloses the measuring room component of graphite blade flowmeter, including measuring room and it is mounted on the indoor rotor assembly of metering；Measuring room includes measuring room cavity and the inlet and outlet that is respectively communicated with measuring room cavity, and the inlet and outlet is arranged on the side wall of measuring room cavity；Measuring room cavity cross section is in cam contour shape, rotor assembly includes the cylindrical core and a pair of of blade member of cylindrical shape, this is in be set in cylindrical core cross-shapedly, and each piece of blade member can radially slide in cylindrical core along cylindrical core to blade member.The measuring room component has many excellent properties such as measuring accuracy is high, reliability is good.
Description
Technical field
The invention belongs to blade flowmeter technical field more particularly to a kind of measuring room portions of graphite graphite blade flowmeter
Part.
Background technique
Blade flowmeter is a kind of higher volumetric flowmeter of measuring accuracy, at present using it is relatively broad be using convex
The metal scrape plate flow meter of wheel construction, with surging, the work also higher and higher to the measuring accuracy of blade flowmeter of oil price
The metering room housing of one of kernel component for metering, also requires higher and higher metering performance therewith.Existing scraper plate stream
Meter, structure are usually " CN102721442A " and " CN2748875Y " " CN206919952U " such as Authorization Notice No., i.e.,
Measuring room cavity with a similar cylindrical cavity is each provided with for a feed liquor and out liquid in the two sides of cavity
Entry/exit runner, measuring room is interior to be equipped with the metallic rotator component for being located at the intracorporal slidable metal plate composition of cylinder, such
The measuring room component of structure is traditional design structure, and the metering more stable for current fuel oil higher precision is uncomfortable already
With causing the fuel oil of two sides mutual for example, being easy that there are measuring room inside cavities cannot effectively separate between import and export
Channelling influences the measuring accuracy of its volumetric metering.Such as " CN102721442A " and " CN2748875Y "
The blade flowmeter of " CN206919952U " etc, the movement of the scraper plate of rotor assembly are all by a cam as profiling
The pattern of movement determines the motion profile of scraper plate from the geometry of cam completely, is easy because cam etc. is associated
Component abrasion and cause precision impaired, for measuring room when with rotor engagement, the contact between inner wall and rotor scraper edge is difficult
To remain in sealing contact, causes the measuring chute surrounded between rotor scraper plate and metering chamber interior walls sufficiently closed, exist
Leakage and the risk for influencing precision.It would therefore be highly desirable to design the novel flowmeter metering unit of one kind to meet ever-increasing meter
Amount demand.
Summary of the invention
It is an object of the invention to solve above-mentioned technical problem, a kind of measuring room component of graphite blade flowmeter is provided,
The measuring room component has many excellent properties such as precision is high, stability is good.
Technical scheme is as follows:
A kind of measuring room component of graphite blade flowmeter, including measuring room and it is mounted on the indoor rotor assembly of metering；
The measuring room includes measuring room cavity and the inlet and outlet that is respectively communicated with measuring room cavity, the import and
Outlet is arranged on the side wall of measuring room cavity；Measuring room cavity cross section is in cam contour shape, and the cam contour is by 4
Curve surrounds, including the first curve that radius is r, radius be R third curve and R > r, the first curve and third curve are just
The center of circle of setting and the first curve is located in the shaft of measuring room inner rotator, between the first curve and third curve respectively
Identical equipped with shape and the arrangement that is mutually symmetrical the second curve and the 4th curve, so that four curves surround the cam contour
Curve；
The rotor assembly includes the cylindrical core and a pair of of blade member of cylindrical shape, this hands over blade member in cross
It is set in cylindrical core forkedly, and each piece of blade member can radially slide in cylindrical core along cylindrical core；
Cylindrical core, including the through-hole being arranged along its central axes, interference fit has shaft in through-hole, and shaft is equipped with two groups
Perpendicular to one another and disjoint perforation, cylindrical core respectively offer one at two mutually perpendicular both ends diametrically
The notch of rectangle, the length direction two sides of the notch extend through the upper and lower end face of cylindrical core；
Blade member, including quantity and the consistent connecting rod arranged in parallel of every group of the number of holes, connecting rod two end difference
It is connected with the graphite scraper plate of one piece of rectangular plate-like, the graphite scraper plate can be free to slide in the notch；All graphite scraper plates
The thrust slot of recess is equipped in face of the side of fluid impact, face is arranged in the thrust slot on two graphite scraper plates of every piece of blade member
On the contrary；
All connecting rods of every piece of blade member axially displaceably correspond in one group of perforation being matched therewith, with
So that two pairs of blade members in be set in cylindrical core cross-shapedly and every piece of blade member can in cylindrical core edge
Cylindrical core radially slides.
Preferably, the expression formula of the curve ρ 1 of second curve and the 4th curve are as follows:
In the above parameter, L is the half of scraper thickness, and θ 1 is the second curve or point and the first curve on the 4th curve
Angle between the center of circle between line and X-axis, Y-axis corresponding to the X-axis are the symmetry axis between second, the 4th liang of curve
Line.
Preferably, the inlet and outlet is also symmetrical about the axis of symmetry.
Further, the import is by first arc-shaped diversion trench and measuring room cavity connection, and described first
Diversion trench is an interlayer space in the metering room housing of the first curve position.
Further, second curve and the 4th curve include leading portion and back segment, wherein for the second curve,
Leading portion is connected with first curve one end, and back segment is connected with third curve one end；For the 4th curve, leading portion and third curve
The other end is connected, and back segment is connected with the other end of the first curve；It is led for described first the leading portion region of second curve
Intersectional region between chute and measuring room cavity, section is located at radially projecting in spaced in metering chamber interior walls thereafter
On several layers water conservancy diversion gusset, which is surface where back segment in circular arc plate and its circular arc concave surface；Adjacent two fuisw rib
It is the second diversion trench that arc-shaped groove is formed by between plate, and second diversion trench is smoothly mutually connected into one with the first diversion trench
Body, intersectional region of the intersection between first diversion trench and measuring room cavity between two diversion trenches.
Further, the leading portion position of the 4th curve also is provided with several water conservancy diversion gussets, the second curve and
Symmetrical about the axis of symmetry between two groups of water conservancy diversion gussets on four curves, the back segment of the 4th curve leans on the part of the first curve
The metering room housing of institute's face is equipped with the separation muscle for separating the inlet and outlet, and the separation muscle is in " people " font,
Its tip portion separates the inlet and outlet, two towards one extended on the inside of measuring room in curved two branch with
Metering chamber interior walls where the interlayer space are linked together, and another article of leading portion bending towards the 4th curve extends and do not protrude into meter
Measure chamber body in so that between two branches one buffer fluid of shape buffer area.
Further, mode is connected and fixed between the graphite scraper plate and connecting rod are as follows: width of the connecting rod along graphite scraper plate
Direction is inserted through thrust slot, and the positioning ring end face that graphite scraper plate is arranged on the side of shaft and connecting rod connects, described to push away
It is also fixedly inserted with locking pin on connecting rod in power slot, between the inner wall of the locking pin and thrust slot by positioning ring side
The holddown spring that be locked pin and thrust slot inner wall press also is cased on connecting rod, so that graphite scraper plate is fixed on interlinking lever end.
Further, a sliding sleeve is equipped in the cylindrical core at the both ends of each perforation of the shaft, it is described
Sliding sleeve is screwed in cylindrical core and is coaxially disposed with perforation, and the inner hole of sliding sleeve is for connecting rod along axially free sliding.
Further, it is screwed with locking nut and adjusting nut by the part of the graphite scraper plate in connecting rod at least one end, adjusted
Wherein one end and the positioning ring for saving nut connect away from a side end face of graphite scraper plate and extruding generated to graphite scraper plate and
It realizes and adjusts graphite scraper plate in the function of interlinking lever end installation site, the locking nut is with adjusting nut close proximity to realize
It is locked to adjusting nut and graphite scraper plate.
Beneficial effects of the present invention: the present invention is cooperated using special measuring room and rotor assembly, it can be achieved that following
The utility model has the advantages that
1, the first diversion trench makes more stable into the indoor fluid of metering, and effectively guarantees effective between inlet and outlet
Partition, can preferably fit together when graphite scraper plate is at third curve, so that metering is more accurate.
2, the second diversion trench can guarantee that liquid does not act on power on the curved surface of scraper plate, influence scraper plate and the fitting of third curve
Together, thrust F2 is gradually increased by diversion trench.
3, aerial drainage gas pressure relief slot gradually pressure release reduce act on graphite scraper plate push away F4, bounce back convenient for scraper plate.
4, erosion control block, buffer area prevent impact of the outlet liquid to rotor assembly, shake back and forth to avoid rotor assembly.
5, the first curve negotiating and cylindrical core external cylindrical surface phase inscribe form sealing, to guarantee the partition of inlet port, shape
At pressure difference.
6, second, four curves make blade member ensure that graphite scraper plate to radially slide brief acceleration as small as possible
It is steady as far as possible in this two sections of curvilinear motion contacts.
7, third curve is as metering curve, scraper plate in this region, due to gravity, centrifugal force and, the effect of liquid thrust
Lower graphite scraper plate is fitted on curve always.
8, the design of graphite blade surface thrust slot, increasing action preferably paste scraper plate and curve in the thrust of scraper plate
It is combined.
9, in rotor assembly, the sealing between connecting rod and cylindrical core is sealed using loop graphite bearing, both can guarantee
Effect sealing, can also promote sliding flexibility, convenient for manufacture, prevent damage of the connecting rod to bearing in the case where concentricity is inadequate.
Detailed description of the invention
Fig. 1 is schematic diagram of the three-dimensional structure.
Fig. 2 is measuring room structural schematic diagram of the invention.
Fig. 3 is the perspective view of measuring room of the invention after its vertical axial cutting.
Fig. 4 is a measuring room of the invention wherein cross-sectional view.
Fig. 5 is the cross-section curve figure of measuring room cavity cam contour shape.
Fig. 6 is the structural schematic diagram of rotor assembly of the invention.
Fig. 7 is the structural schematic diagram after two blade members and cylindrical core fractionation.
Fig. 8 is the top view of rotor assembly of the invention.
Fig. 9 is A-A cross-sectional view in Fig. 8.
Figure 10 is cross-sectional view of the invention.
Figure 11 is the stress analysis schematic diagram at the first position of rotor assembly.
Figure 12 is the stress analysis schematic diagram at second of position of rotor assembly.
Figure 13 is the stress analysis schematic diagram at the third position of rotor assembly.
Figure 14 is the stress analysis schematic diagram at the 4th kind of position of rotor assembly.
Figure 15 is discharge capacity account schematic diagram.
Figure 16 is the first derivation schematic diagram of measuring room curve.
Figure 17 is the second derivation schematic diagram of measuring room curve.
Figure 18 is that the third of measuring room curve derives schematic diagram.
Component label instructions: the first curve 1, the leading portion 2 of the second curve, the back segment 3 of the second curve, third curve the 4, the 4th
The leading portion 5 of curve, the back segment 6 of the 4th curve, the axis of symmetry 7, the second curve 8, the 4th curve 9, rotor scraper plate 10, import 11,
It exports the 12, first diversion trench 13, water conservancy diversion gusset 14, the second diversion trench 15, separate muscle 16, buffer area 17, cylindrical core 18, erosion control
Block 19, shaft 21, connecting rod 22, graphite scraper plate 23, locking pin 24, holddown spring 25, thrust slot 26, is lived at aerial drainage gas pressure relief slot 20
Cover graphite bearing 27, positioning ring 28, adjusting nut 29, rectangular notch 1801.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily.
Present invention will be further explained below with reference to the attached drawings and examples:
A kind of measuring room component of graphite blade flowmeter as shown in Fig. 1 and Figure 10, including measuring room and is mounted on metering
Indoor rotor assembly.Wherein, as shown in Fig. 2-5, measuring room includes measuring room cavity and is respectively communicated with measuring room cavity
Import 11 and outlet 12, the import 11 and outlet 12 are arranged on the side wall of measuring room cavity；The measuring room cavity is transversal
Face is in cam contour shape, and the cam contour surrounds by 4 curves, the third for being R including the first curve 1 that radius is r, radius
The center of circle of curve 4 and R > r, the first curve 1 and the setting of 4 face of third curve and the first curve 1 is located at measuring room inner rotator
In shaft, it is respectively equipped with that shape is identical and 8 He of the second curve for the arrangement that is mutually symmetrical between the first curve 1 and third curve 4
4th curve 9, so that four curves surround the cam profile curve.
As shown in Fig. 6-9, the rotor assembly of the graphite blade flowmeter of the present embodiment, the cylinder including cylindrical shape
Core 18 and a pair of of blade member, this to blade member in being set in cylindrical core 18 cross-shapedly, and each piece of scraper plate
Component can radially slide in cylindrical core 18 along cylindrical core 18.
As shown in Fig. 6-7, cylindrical core 18 includes the through-hole along the setting of its central axes, and interference fit has shaft in through-hole
21, shaft 21 is equipped with two groups of perpendicular to one another and disjoint perforation, and cylindrical core 18 is mutually perpendicular diametrically at two
Both ends at respectively offer the notch of a rectangle, the length direction two sides of the notch extend through the upper of cylindrical core 18
Lower end surface, so that weight can be mitigated significantly to enhance the service life of bearing using design empty in outer reality.
As shown in Fig. 6-7, blade member includes quantity and the consistent connecting rod arranged in parallel of every group of the number of holes
22,22 both ends of connecting rod are connected separately with the graphite scraper plate 23 of one piece of rectangular plate-like, and the graphite scraper plate 23 can be in the notch
It is free to slide；All graphite scraper plates 23 are equipped with the thrust slot 26 of recess in face of the side of fluid impact, every piece of blade member
Face is arranged on the contrary, the thrust slot 26 is preferably stretched under the cooperation of rectangular notch 1801 in thrust slot 26 on two graphite scraper plates 23
Out cylindrical core 18 and cater to the impact of fluid so that when scraper component rotates more reliably between metering chamber interior walls effectively
Contact promotes measuring accuracy.
As shown in Fig. 8-9, all connecting rods 22 of every piece of blade member are axially displaceably corresponded to across being matched therewith
One group of perforation in so that two pairs of blade members are in being set in cylindrical core 18 and every piece of blade member is equal cross-shapedly
It can be radially slided in cylindrical core 18 along cylindrical core 18.
The above structure, for measuring room, the first curve 1 passes through and rotor outer circle (18 external cylindrical surface of cylindrical core) shape
Pressure difference is formed at sealing to guarantee the partition of inlet port.Second curve 8 and the 4th curve 9 are transition arc curve, be ensure that
Scraper plate is steady as far as possible in this two sections of curves, makes scraper plate to radially slide brief acceleration most for circular cylindrical cavity
May it is small, and make third curve 4 as metering curve when scraper plate in this region, due to gravity, centrifugal force and liquid thrust
Effect lower scraping plate is fitted in always on third curve 4, accurate measurement.It can be seen that being surrounded using this four curves transversal
Face is in the special metering cavity of cam contour shape, and advantageously allowing rotor can under the percussion of fluid inside metering cavity
It preferably to push fluid motion, is measured, measuring chute is between rotor corresponding to third curve 4 and metering chamber interior walls
Cavity, the graphite scraper plate of rotor assembly preferably continuously and stably contacts with measuring room cavity inner wall, relative to such as traditional
Cockscomb etc cylindrical measuring room cavity or other shapes cavity for measure it is more accurate.
After rotor assembly is packed into measuring room cavity, since connecting rod 22 can be in cylindrical core 18 along cylindrical core 18
Radial slippage, therefore, in measuring room enter fluid media (medium) to be batched after, in fluid impact to the promotion of graphite scraper plate 23
Under effect, rotor assembly is started turning, and cooperates the unique cam profile of measuring room cavity of measuring room, with measuring room
The curvilinear motion of cavity inner wall, correspondingly realizes radial slippage, so that keeping always with cavity wall of cavity wall during rotation
Good contact, graphite is smooth and wearability is good, can guarantee that its permanently effective between measuring room cavity inner wall contacts, connecting rod 22
Cross connects graphite scraper plate 23 with being staggeredly arranged so that entire rotor component construction is compact and flexibility is good, it is often more important that
The design of rotor thrust slot 26, increasing action is in the thrust of blade member, especially using the recessed of waist hole type as shown in drawings
When slot designs, fluid thrust can be more fully utilized, preferably pastes the curve of graphite scraper plate 23 and measuring room cavity inner wall
It is combined, guarantees measuring accuracy.
Explanation is explained in detail to the working principle combination respective drawings of the measuring room component of the present embodiment below:
One, Force Calculation
Because graphite scraper plate 23 and the finish of thrust slot 26 are very high, the single-sided friction resistance pair of scraper plate and slot can be ignored herein
The influence of movement, for convenient for the link position relationship between statement response curve, the second curve 8 and the 4th curve 9 are divided respectively
For the leading portion 2 of the second curve, the back segment 3 of the second curve, the back segment 6 of the leading portion 5 of the 4th curve, the 4th curve.
When the working condition shown in Figure 11, the stress Fa=Tacos θ a+Ga+Na=Tacos θ a+mg+m ω 2ra of scraper plate a
The stress Fc=Gc-Nc+Tccos θ c of scraper plate c (the thrust Tc for acting on scraper plate C is zero)
=mg-m ω 2r c+Tccos θ c
Along the resultant force Fac=Tacos θ a+Ga+Na+Gc-Nc+Tccos θ c of scraper plate ac
=Tacos θ a+mg+m ω 2ra+mg-m ω 2r c+Tccos θ c (ra > r c) > 0
Therefore the back segment 3 that scraper plate a pastes the second curve slides.
The stress Fd=Tdcos θ d+Nd=Tdcos θ d+m ω 2r d of scraper plate d
The stress Fb=Nb=m ω 2rb of scraper plate b
Along resultant force Fbd=Tdcos θ d+Nd-Nb=Tdcos θ d+m ω 2r d-m ω 2rb (rd > rb) > 0 of scraper plate bd
Therefore scraper plate d patch third curve 4 slides.
When the working condition shown in Figure 12, the stress Fa=Tacos θ a+Gacos β a+Na=Tacos θ a+mgcos of scraper plate a
βa+mω2ra
The stress Fc=Gccos β c-Nc of scraper plate c (the thrust Tc for acting on scraper plate C is zero)
=mgcos β c-m ω 2r c
Along scraper plate ac resultant force Fac=Tacos θ a+Gacos β a+Na+Gccos β c-Nc
=Tacos θ a+mgcos β a+m ω 2ra+mg cos β c--m ω 2r c (ra > r c) > 0
Therefore scraper plate a patch third curve 4 slides.
The stress Fd=Gdcos θ d-Nd-Tdcos θ d=mgcos θ d+m ω 2r d-Tdcos θ d of scraper plate d
The stress Fb=Nb+Gbcos θ b+Tbcos θ b of scraper plate b
=m ω 2rb+mgcos θ b+Tbcos θ b
Along the resultant force Fbd=Gdcos θ d-Nd-Tdcos θ d+Nb+Gbcos θ b+Tbcos θ b=mgcos θ d-m ω of scraper plate bd
2r d-Tdcosθd+mω2rb+mgcosθb+Tbcosθb
As mgcos θ d+m ω 2rb+mgcos θ b+Tbcos θ b < m ω 2r d+Tdcos θ d
The leading portion 5 that scraper plate d againsts the 4th curve slides.
As the rotation of rotor is as mgcos θ d+m ω 2rb+mgcos θ b+Tbcos θ b > m ω 2r d+Tdcos θ d
Scraper plate d gradually disengages the leading portion 5 of the 4th curve and leading portion 2 that b then againsts the second curve slides.
When the working condition shown in Figure 13, the stress Fa=Tacos θ a-Gacos β a+Na=Tacos θ a- of scraper plate a
mgcosβa+mω2ra
The stress Fc=Gccos β c+Nc of scraper plate c (the thrust Tc for acting on scraper plate C is zero)
=mgcos β c+m ω 2r c
Along the resultant force Fac=Tacos θ a-Gacos β a+Na-Gccos β c-Nc=Tacos θ a-mgcos β a+m ω of scraper plate ac
2ra-mgcos β c-m ω 2r c (ra > r c, Tacos θ a > mgcos β a+mgcos β c) > 0
Therefore scraper plate a patch third curve 4 slides.
The stress Fd=Tdcos θ d-Nd+Gdcos β d=Tdcos θ d-m ω 2r d+mgcos β d of scraper plate d
The stress Fb=Nb+Tbcos θ b+Gbcos β b=m ω 2rb+Tbcos θ b+mgcos β b of scraper plate b
Along the resultant force Fbd=Tdcos θ d-Nd+Gdcos β d-Nb-Tbcos θ b-Gbcos β b=Tdcos θ d-m ω of scraper plate bd
2r d+mgcos β d+m ω 2r b+Tbcos θ b+mgcos β b (rd < r b) > 0
Therefore scraper plate b patch third curve 4 slides.
When rotor assembly goes to Figure 14 as in the operating condition of Figure 12, details are not described herein again.
In conclusion the present invention specially devises the measuring room and rotor assembly having their own characteristics each, and two kinds of components are preferable
Ground combines together, and has collectively constituted core component-measuring room component of graphite blade flowmeter, rotor assembly centrifugal force,
The thrust self gravity of media flow is contacted with the cam contour shape Curve Matching of measuring room cavity, so that blade member is multiple
It naturally contacts with measuring room cavity inner wall under power force action, makees relative to traditional cockscomb by cam face
It is pattern come for guaranteeing its motion profile, the movement between blade member and measuring room in the present embodiment is by fluid stream
Resultant force caused by centrifugal force when thrust, blade member gravity and rotation when dynamic guarantees that graphite scraper plate is close to measuring room
Cavity inner wall is mobile, takes advantage of a situation and moves from being largely synthesis stress when complying with flow meters work, not only according to
Mechanically limit its motion profile by measuring room cavity geometry in particular, in addition, the measuring room component of the present embodiment with
The measuring room component measuring principle of general blade flowmeter is different, the scraping plate part of the cross-shaped arrangement of this measuring room component
What is formed between part, with metering chamber interior walls is four regions, wherein the fan-shaped region being only located on third curve is only measuring chute,
When rotated rather than general blade flowmeter, the measuring chute the same always with four volumes, due to cam contour shape
Special metering cavity body structure form, is aided with adaptable rotor assembly, and graphite scraper plate is passing through third under above-mentioned force action
The measuring room cavity that automatically can towards one Slideslip of third curve and be thus close to where third curve when curve (at measuring chute)
Inner wall has fully ensured that the airtightness at measuring chute, to ensure that measuring accuracy, also, due to the graphite under force action
Scraper plate can be naturally towards third curved slide motion, therefore, and even the corresponding contact side of graphite scraper plate has a certain amount of
Abrasion, will not influence graphite scraper plate at measuring chute with the contact tightness of third curve, thus just not interfere with meter
Accuracy of measurement.
As another embodiment, on that basi of the above embodiments, by the design parameter of the second curve 8 and the 4th curve 9 into
The further optimization design of row, obtains the expression formula of the curve ρ 1 of the second curve 8 and the 4th curve 9 are as follows:
In the above parameter, L is the half of scraper thickness, and θ 1 is the second curve 8 or point and the first song on the 4th curve 9
Angle between the center of circle of line 1 between line and X-axis, Y-axis corresponding to the X-axis are pair between second, the 4th liang of curve
Claim axis 7.It is directed to the expression formula of above-mentioned curve ρ 1, specific derivation process is as follows:
The discharge capacity account method of blade flowmeter is introduced first, and the R in above-described embodiment and r are and flowmeter itself
The measurement unit (discharge capacity) of setting is directly related, and specific value is determined by flowmeter discharge capacity itself, also, wherein r is equal to
The radius value of cylindrical core 18 used by rotor assembly, therefore, r value are needed according to the radius of used cylindrical core come really
It is fixed.The discharge capacity account schematic diagram of measuring room is as shown in figure 15, wherein
Scraper thickness: B
Measuring room height: H
Discharge capacity: q1
It is not difficult to find out that the every of measuring room turns discharge capacity according to the principle of blade flowmeter are as follows:
Q1=(π × (R2-r2) -4S1+4 (R-r) × B) × H (1)
In formula, S1 is the area that scraper plate cross-sectional area accounts in circular ring shape chamber volume cross-sectional area, can from attached drawing
S1 is the bow-shaped area that a rectangular area adds top out, subtracts the bow-shaped area of lower part, obtains following formula after collated
(2):
It brings formula (2) into formula (1) and obtains q1:
Therefore, after setting the discharge capacity q1 of flowmeter itself, due to the cylindrical core of r value and used rotor assembly
Partial diameter is related, therefore the value of R can be calculated according to discharge capacity q1 and r.
Then, the present embodiment continues to provide the second curve 8 and the calculating process of the 4th curve 9 is as follows:
Rotor uniform rotation, as shown in figure 16, at the first curve 1 and third curve 4, rotor scraper plate 10 (that is, scraper plate
Component) do not radially slide that (its blade/scraper plate can be slided in the radial direction inside measuring room when rotated because of rotor assembly
Dynamic, to continuously contact with metering chamber interior walls holding, and two curves are therefore sliding is not present in standard circular arc herein), in third
4 upper scraping plate of curve and inner wall are face contacts, and on the first curve 1, and scraper plate and inner wall are that line is contacted and (shown a little after taking section
A, B), and on the second curve 8 and the 4th curve 9, scraper plate then radially slides that (contact point of upper scraping plate and inner wall is begun in section
It is eventually M, N and M1, N1).
When at this time scraper plate being required to radially slide, acceleration as far as possible it is small in the hope of rotate it is more steady, to guarantee
The noise of flowmeter, stability, precision are more preferable, may know that the second curve 8 and the 4th curve 9 respectively just by the motion process of scraper plate
It is the moving contact track of scraper plate endpoint M and N, formula equation is carried out to the second curve 8 and the 4th curve 9 and is carried out gradually excellent
Change, this two easement curves need to meet the following conditions:
Condition one: scraper plate overall length is fixed length.
The back segment 6 of the leading portion 2 of two: the first curve 1 of condition and the second curve, the 4th curve；Third curve 4 and the second curve
Back segment 3 and the 4th curve leading portion 5；The leading portion 2 of second curve and the back segment 3 of the second curve, the leading portion 5 of the 4th curve and
6 transition of back segment of four curves is smooth (tangent), to eliminate scraper plate to the impact force of inner wall.
Condition three: when scraper plate radially slides in the rotor, acceleration is small as far as possible, keeps its rotation more steady.
As shown in figure 17, first assume that scraper plate is that (4 radius R of third curve, 1 radius r of the first curve, second is bent for a straight line
The leading portion 2 of line, the back segment 3 of the second curve are the easement curve that angle is 2 α).
(1) ρ (θ)+ρ (- θ)=R+r (constant), (meeting condition one)
(2) ρ (α)=R, ρ (- α)=r (meet condition two)
(3) acceleration is as small as possible when requiring scraper plate to do radial motion, that is, requiresIt is numerically as small as possible (full
Sufficient condition three)
Angular speedInherently
It is required thatNumerical value is small as far as possible, is equivalent to(θ) is numerically as small as possible.
According to condition one: ρ (θ)+ρ (- θ)=R+r (constant), the amount that ρ is changed when polar angle changes to θ by 0, with by 0 to-
The amount that ρ is changed when θ should cancel out each other.If this variable quantity presses the sinusoidal variation such as sin θ or sin2 θ, just there are this feelings
Condition enables variable quantity ρ (θ)-ρ (0)=f (θ), and f (θ) is equal with f (- θ) numerical value, contrary to be
F (θ)=- f (- θ)
F (θ) is odd function
ρ=ρ (θ)=f (0)+f (θ)=a+f (θ) (f (0)=a is a constant)
If choosing f (θ)=b θ, that is, ρ=a+b θ, the condition a of satisfaction still
ρ ' (θ)=b, in b ≠ 0, ρ ' (θ) ≠ 0 is unsatisfactory for condition c
Therefore it can try to take ρ=a+b θ+c θ3
According to condition one, two:
a+bα+cα3=R
a-bα-cα3=r
b+3cα2=0
Therefore,
Temporarily to take in view of the leakproofness at metering third curve 4
2, scraper plate is actually not straight line but width is 2L, as shown in figure 18:
M1 and M are linked up, and when OM1 goes to the angle that OM is passed through, which can regard as
ρ=ρ 1
The track i.e. side of the second curve 8 of M1 (ρ 1, θ 1) then can be obtained in the equation of locus (formula one) of band access point M1 (ρ, θ)
Journey, but be only limitted in sectionAbove, in sectionIt is upper existing
Therefore M (ρ, θ) is located on orthodrome 4, and ρ 1=R obtains the expression formula of the second curve 8 are as follows:
Therefore the expression formula of the 4th curve 9 has also been obtained.
The difference (ρ 1 is actually reduced into ρ) of ρ 1 and ρ is not considered in above-mentioned operation, and replaces arc length to scrape board width 2L,
Because their difference is very small, (formula two) is enough accurate.
It is derived according to above-mentioned a series of curve as can be seen that the measuring room cavity use based on cam contour shape structure should
After specific parameter of curve manufacture, it can to cooperate more preferably between measuring room itself and rotor, excellent combination property, adaptability
It by force, can larger promotion measuring accuracy.
As embodiment, it is preferable that the import 11 and outlet 12 are also symmetrical about the axis of symmetry 7, the import
11 by arc-shaped first diversion trench 13 and measuring room cavity connection, and first diversion trench 13 is 1 institute of the first curve
An interlayer space in metering room housing at position, so that external fluid is successfully introduced into measuring room cavity
Interior, the fluid of entrance is more stable, and effective guarantee inlet and outlet are effectively separated, and rotor scraper plate 10 is at third curve 4
When can preferably fit together (close to 1 side of the first curve scraper plate stress it is smaller, hardly by External force interference).
Further, for the second curve 8, leading portion is connected with 1 one end of the first curve, back segment and 4 one end of third curve
It is connected；For the 4th curve 9, leading portion is connected with the other end of third curve 4, and back segment is connected with the other end of the first curve 1；
Intersectional region of the leading portion region of second curve 8 between first diversion trench 13 and measuring room cavity, thereafter
Section is located on the radially projecting spaced several layers water conservancy diversion gusset 14 in metering chamber interior walls, and the water conservancy diversion gusset 14 is in circle
Arc plate and its circular arc concave surface are surface where back segment；It is second that arc-shaped groove is formed by between adjacent two water conservancy diversion gusset 14
Diversion trench 15, second diversion trench 15 smoothly connect integrally with the first diversion trench 13, and intersection is institute between two diversion trenches
State the intersectional region between the first diversion trench 13 and measuring room cavity.Second diversion trench 15 can guarantee that liquid does not act on power
In on the curved surface of scraper plate, influencing scraper plate and third curve 4 fits together, it is gradually increased by the second diversion trench 15 to scraper plate
Thrust.
Further, as shown in Fig. 3-4, the leading portion position of the 4th curve also is provided with several water conservancy diversion gussets
14, water conservancy diversion this at symmetrical about the axis of symmetry 7 between two groups of water conservancy diversion gussets 14 on the second curve 8 and the 4th curve 9
The arc-shaped groove formed between plate 14 is used as aerial drainage gas pressure relief slot 20, and gradually pressure release reduces the thrust for acting on scraper plate, just
It is retracted into cylindrical core 18 in scraper plate.The back segment of 4th curve 9 is in the metering room housing of the part institute face of the first curve 1
Equipped with the separation muscle 16 for separating the import 11 and outlet 12, the separation muscle 16 is in " people " font, and tip portion will
The import 11 and outlet 12 separate, and two extend one and the interlayer in curved two branch towards measuring room inside
Metering chamber interior walls where space are linked together, another article as erosion control block 19 towards the 4th curve 9 leading portion bending extend and
Do not protrude into measuring room cavity so that between two branches one buffer fluid of shape buffer area 17, can be highly desirable
Impact of the outlet liquid to rotor assembly is prevented, is shaken back and forth to avoid rotor assembly.
Further, on the basis of above-mentioned all embodiments, the connection between the graphite scraper plate 23 and connecting rod 22 is solid
Determine mode are as follows: connecting rod 22 is inserted through thrust slot 26 along the width direction of graphite scraper plate 23, and graphite scraper plate 23 is by shaft 21
28 end face of positioning ring being arranged on side and connecting rod 22 connects, and is also fixedly inserted with locking on the connecting rod 22 in the thrust slot 26
Pin 24 is also cased with the pin that is locked on the connecting rod 22 between the inner wall of the locking pin 24 and thrust slot 26 by 28 side of positioning ring
24 and the holddown spring 25 that presses of 26 inner wall of thrust slot so that graphite scraper plate 23 is fixed on 22 end of connecting rod, locking pin 24 with
Scraper plate is mounted on connecting rod 22 by spring cooperation with holding out against, and wants firm for general direct interference fit is fixed, this
It is axially to be pushed up because the material characteristic of graphite itself is not suitable for metal material like that using interference fit using this locking spring
Graphite scraper plate 23 is fixed on connecting rod 22 by tight mode efficiently avoids this problem, and convenient for assembly and disassembly maintenance.
Further, a loop stone is equipped in the cylindrical core 18 at the both ends of each perforation of the shaft 21
Black bearing 27, the loop graphite bearing 27 are screwed in cylindrical core 18 and are coaxially disposed with perforation, loop graphite bearing 27
For connecting rod 22 along axially free sliding, additional loop graphite bearing 27 is arranged can reduce for cylindrical core 18 inner hole
Material requires and requirement on machining accuracy, when production, need to only consider that the material of loop graphite bearing 27 and machining accuracy are i.e. certifiable
The flexibility and reliability that slides axially of connecting rod 22, to guarantee the working performance of blade member, and most important purpose is to borrow stone
The lubrication and leakproofness of black bearing, so that the interspersed cooperation between connecting rod 22 and cylindrical core 18 will not be because (medium is in stone for leakage
Flowing is permeated in the area of space encircled a city between black scraper plate 23 and metering chamber interior walls) and influence measuring accuracy.
Further, locking nut and adjusting nut are screwed with by the part of the graphite scraper plate 23 in at least one end of connecting rod 22
29, wherein one end of the adjusting nut connects away from a side end face of graphite scraper plate 23 with the positioning ring 28 and scrapes to graphite
The generation of plate 23 squeezes and realizes and adjust graphite scraper plate 23 in the function of 22 end installation site of connecting rod, the locking nut and adjusting
29 close proximity of nut is to realize being locked to adjusting nut 29 and graphite scraper plate 23.The structure design primarily to
It is needing to be the adjusting for carrying out entire scraper component length direction, is adjusting graphite scraper component by adjusting this to nut
Length achievees the purpose that the gap for adjusting graphite scraper plate and shell inner cavity, to guarantee measuring accuracy.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (9)
1. a kind of measuring room component of graphite blade flowmeter, including measuring room and it is mounted on the indoor rotor assembly of metering；
The measuring room includes measuring room cavity and the inlet and outlet that is respectively communicated with measuring room cavity, the inlet and outlet
It is arranged on the side wall of measuring room cavity；It is characterized by: measuring room cavity cross section is in cam contour shape, the cam
Profile is surrounded by 4 curves, including the first curve that radius is r, radius be R third curve and R > r, the first curve and third
The curve face setting and center of circle of the first curve is located in the shaft of measuring room inner rotator, the first curve and third curve it
Between be respectively equipped with that shape is identical and the second curve and the 4th curve of the arrangement that is mutually symmetrical so that four curves surround it is described convex
Take turns contour curve；
The rotor assembly includes the cylindrical core and a pair of of blade member of cylindrical shape, this is to blade member in cross-shaped
Ground is set in cylindrical core, and each piece of blade member can radially slide in cylindrical core along cylindrical core；
Cylindrical core, including the through-hole being arranged along its central axes, interference fit has shaft in through-hole, and shaft is equipped with two groups each other
Vertical and disjoint perforation, cylindrical core respectively offer a rectangle at two mutually perpendicular both ends diametrically
Notch, the length direction two sides of the notch extend through the upper and lower end face of cylindrical core；
Blade member, including quantity and the consistent connecting rod arranged in parallel of every group of the number of holes, connecting rod two end is separately connected
There is the graphite scraper plate of one piece of rectangular plate-like, the graphite scraper plate can be free to slide in the notch；All graphite scraper plates face
The side of fluid impact is equipped with the thrust slot of recess, and face phase is arranged in the thrust slot on two graphite scraper plates of every piece of blade member
Instead；
All connecting rods of every piece of blade member axially displaceably correspond in one group of perforation being matched therewith, so that
Cylindrical core is interior and every piece of blade member can be in cylindrical core along cylinder in being set to cross-shapedly for two pairs of blade members
Core radially slides.
2. the measuring room component of graphite blade flowmeter according to claim 1, it is characterised in that: second curve and
The expression formula of the curve ρ 1 of four curves are as follows:
ρ 1=R,
In the above parameter, L is the half of scraper thickness, and θ 1 is the second curve or point and the first curve center of circle on the 4th curve
Between angle between line and X-axis, Y-axis corresponding to the X-axis is the axis of symmetry between second, the 4th liang of curve.
3. the measuring room component of graphite blade flowmeter according to claim 1 or claim 2, it is characterised in that: the import and go out
Mouth is also symmetrical about the axis of symmetry.
4. the measuring room component of graphite blade flowmeter according to claim 3, it is characterised in that: the import passes through one
Arc-shaped the first diversion trench and measuring room cavity connection, first diversion trench are the measuring room of the first curve position
The intracorporal interlayer space of shell.
5. the measuring room component of graphite blade flowmeter according to claim 4, it is characterised in that: second curve and
Four curves include leading portion and back segment, wherein for the second curve, leading portion is connected with first curve one end, back segment and third
Curve one end is connected；For the 4th curve, leading portion is connected with the other end of third curve, the other end of back segment and the first curve
It is connected；Intersectional region of the leading portion region of second curve between first diversion trench and measuring room cavity,
Back segment is located on the radially projecting spaced several layers water conservancy diversion gusset in metering chamber interior walls, which is in circular arc
Plate and its circular arc concave surface are surface where back segment；It is the second water conservancy diversion that arc-shaped groove is formed by between adjacent two water conservancy diversion gusset
Slot, second diversion trench smoothly connect integrally with the first diversion trench, and intersection is first water conservancy diversion between two diversion trenches
Intersectional region between slot and measuring room cavity.
6. the measuring room component of graphite blade flowmeter according to claim 5, it is characterised in that: before the 4th curve
Section position also is provided with several water conservancy diversion gussets, about described between two groups of water conservancy diversion gussets on the second curve and the 4th curve
The axis of symmetry is symmetrical, and the back segment of the 4th curve is equipped with by the metering room housing of the part institute face of the first curve for separating
The separation muscle of inlet and outlet is stated, the separation muscle is in " people " font, and tip portion separates the inlet and outlet,
Two are linked as one with the metering chamber interior walls where the interlayer space towards one on the inside of measuring room in curved two branch of extension
Body, another article of leading portion bending towards the 4th curve extends and does not protrude into measuring room cavity, so that shape between two branches
The buffer area of one buffer fluid.
7. according to the measuring room component of any one of the claim 4-6 graphite blade flowmeter, it is characterised in that: the stone
Mode is connected and fixed between black scraper plate and connecting rod are as follows: connecting rod is inserted through thrust slot, stone along the width direction of graphite scraper plate
The positioning ring end face that black scraper plate is arranged on the side of shaft and connecting rod connects, and also fixedly inserts on the connecting rod in the thrust slot
There is locking pin, is also cased with to be locked on the connecting rod between the inner wall of the locking pin and thrust slot by positioning ring side and pin and pushes away
The holddown spring that power slot inner wall presses, so that graphite scraper plate is fixed on interlinking lever end.
8. the measuring room component of graphite blade flowmeter according to claim 7, it is characterised in that: in each of described shaft
Be equipped with a sliding sleeve in cylindrical core at the both ends of perforation, the sliding sleeve be screwed in cylindrical core and with coaxial set of perforating
It sets, the inner hole of sliding sleeve is for connecting rod along axially free sliding.
9. the measuring room component of graphite blade flowmeter according to claim 8, it is characterised in that: leaned in connecting rod at least one end
The part of the graphite scraper plate is screwed with locking nut and adjusting nut, and wherein one end of the adjusting nut and the positioning ring are carried on the back
A side end face from graphite scraper plate, which connects and generates to graphite scraper plate, to be squeezed and realizes that adjust graphite scraper plate installs in interlinking lever end
The function of position, the locking nut and adjusting nut close proximity are to realize that the locking to adjusting nut and graphite scraper plate is solid
It is fixed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811109299.9A CN108981836B (en) | 2018-09-21 | 2018-09-21 | Metering chamber component of graphite scraper flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811109299.9A CN108981836B (en) | 2018-09-21 | 2018-09-21 | Metering chamber component of graphite scraper flowmeter |
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| CN108981836B CN108981836B (en) | 2023-09-15 |
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| CN108981836B (en) | 2023-09-15 |
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