CN208688587U - A kind of measuring room of blade flowmeter - Google Patents

Abstract

The utility model discloses a kind of measuring room of blade flowmeter, and including measuring room cavity and the inlet and outlet being respectively communicated with measuring room cavity, the inlet and outlet is arranged on the side wall of measuring room cavity；Measuring room cavity cross section is in cam contour shape, the cam contour is surrounded by 4 curves, including the first curve that radius is r, radius be R third curve and R > r, the center of circle of first curve and the setting of third curve face and the first curve is located in the shaft of measuring room inner rotator, it is respectively equipped with that shape is identical and the second curve and the 4th curve of the arrangement that is mutually symmetrical between the first curve and third curve, so that four curves surround the cam profile curve.It is the measuring room excellent combination property, adaptable, it can larger promotion measuring accuracy.

Description

A kind of measuring room of blade flowmeter

Technical field

The utility model belongs to blade flowmeter technical field more particularly to a kind of measuring room shell of graphite blade flowmeter Body.

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 is usually if Authorization Notice No. is " CN102721442A " and " CN2748875Y " " CN206919952U " etc Measuring room casing mechanism, i.e. the measuring room cavity with a similar cylindrical cavity is each provided with one in the two sides of cavity A to be used for feed liquor and out the entry/exit runner of liquid, the metering room housing birth of the structure is more early, already for current fuel metering It through not applicable, is particularly susceptible that there are measuring room inside cavities cannot effectively separate between import and export, leads to the combustion of two sides The mutual channelling of oil, influences the measuring accuracy of its volumetric metering；Also, the measuring room is when with rotor engagement, inner wall with turn Contact between sub- edge is difficult to remain in sealing contact, causes rotor blade and measures the measuring chute surrounded between chamber interior walls Cannot be sufficiently closed, the risk of precision is influenced there are leakage.

Utility model content

Utility model aims to solve above-mentioned technical problems, provide a kind of measuring room of blade flowmeter, the meter Room excellent combination property, adaptable is measured, it can larger promotion measuring accuracy.

The technical solution of the utility model is as follows:

A kind of measuring room of blade flowmeter including measuring room cavity and the import being respectively communicated with measuring room cavity and goes out Mouthful, the inlet and outlet is arranged on the side wall of measuring room cavity；Measuring room cavity cross section is in cam contour shape, institute Cam contour is stated to be surrounded by 4 curves, including the first curve that radius is r, radius be R third curve and R > r, the first curve It is located in the shaft of measuring room inner rotator with the center of circle of the setting of third curve face and the first curve, in the first curve and third It is respectively equipped with that shape is identical and the second curve and the 4th curve of the arrangement that is mutually symmetrical between curve, so that four curves surround The cam profile curve.

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.

The utility model has the beneficial effects that in the measuring room that the utility model is announced, outside the first curve negotiating and rotor Circle (cylindrical core external cylindrical surface) forms sealing, to guarantee the partition of inlet port, forms pressure difference.Second curve and the 4th curve are Transition arc curve ensure that scraper plate is steady as far as possible in this two sections of curves, for circular cylindrical cavity scraper plate be existed Scraper plate is in this region when it is as small as possible to radially slide brief acceleration, and making third curve as metering curve, due to gravity, Scraper plate is fitted in always on third curve under the action of centrifugal force and liquid thrust, accurate measurement.It can be seen that using this four The cross section that curve surrounds is in the special metering cavity of cam contour shape, is conducive to cooperate with existing rotor assembly, so that Rotor can preferably push fluid motion inside metering cavity under the percussion of fluid, be measured, the leaf of rotor Piece/scraper plate is preferably continuously and stably contacted with measuring room cavity inner wall, impact is reduced, relative to such as traditional cockscomb Etc cylindrical measuring room cavity or other shapes cavity for measure more accurate, noise is lower, is more applicable in.

Detailed description of the invention

Fig. 1 is the utility model schematic perspective view.

Fig. 2 is perspective view of the utility model after its vertical axial cutting.

Fig. 3 is the utility model wherein cross-sectional view.

Fig. 4 is the cross-section curve figure of measuring room cavity cam contour shape.

Fig. 5 is the cooperation schematic diagram of a kind of rotor assembly and the utility model.

Fig. 6 is discharge capacity account schematic diagram.

Fig. 7 is the first derivation schematic diagram.

Fig. 8 is the second derivation schematic diagram.

Fig. 9 is that third 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, aerial drainage gas pressure relief slot 20.

Specific embodiment

The embodiments of the present invention is illustrated by particular specific embodiment below, those skilled in the art can be by this Content disclosed by specification understands other advantages and effect of the utility model easily.

The utility model is described in further detail with reference to the accompanying drawings and examples:

As shown in Fig. 1-4, a kind of measuring room of blade flowmeter, including measuring room cavity and with measuring room cavity distinguish The import 11 and outlet 12 of connection, the import 11 and outlet 12 are arranged on the side wall of measuring room cavity；The metering chamber Body cross section is in cam contour shape, and the cam contour surrounds by 4 curves, including the first curve 1 that radius is r, radius R Third curve 4 and R > r, the first curve 1 and the setting of 4 face of third curve and the center of circle of the first curve 1 be located inside measuring room In the shaft of rotor, it is respectively equipped with that shape is identical and the second of the arrangement that is mutually symmetrical is bent between the first curve 1 and third curve 4 Line 8 and the 4th curve 9, so that four curves surround the cam profile curve.First curve 1 passes through and rotor outer circle (circle 18 external cylindrical surface of column core) sealing is formed, to guarantee the partition of inlet port, form pressure difference.Second curve 8 and the 4th curve 9 are Transition arc curve ensure that scraper plate is steady as far as possible in this two sections of curves, for circular cylindrical cavity scraper plate be existed Scraper plate is in this region when it is as small as possible to radially slide brief acceleration, and making third curve 4 as metering curve, due to weight Scraper plate is fitted in always on third curve 4 under the action of power, centrifugal force and liquid thrust, accurate measurement.It can be seen that using this The cross section that four curves of kind surround is in the special metering cavity of cam contour shape, is conducive to and existing rotor assembly cooperates It (since existing rotor is many kinds of, does not do concrete example elaboration herein, cell structure those skilled in the art is measured based on this kind Respective rotor can directly be borrowed or do adaptable change in design i.e. can be used), so that rotor inside metering cavity Fluid motion can be preferably pushed under the percussion of fluid, is measured, and measuring chute is to turn corresponding to third curve 4 Cavity between son and metering chamber interior walls, blade/scraper plate of rotor are preferably continuously and stably contacted with measuring room cavity inner wall, It is measured subject to more for the cylindrical measuring room cavity or other shapes cavity of such as traditional cockscomb etc Really.A kind of rotor assembly is shown in Fig. 5 in the intracorporal fit structure of measuring room chamber.

Preferably, on that basi of the above embodiments, the design parameter of the second curve 8 and the 4th curve 9 is carried out further Optimization design, obtain 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 6, 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 and the calculating process of the 4th curve is as follows:

Rotor uniform rotation, as shown in fig. 7, rotor scraper plate 10 does not do radial cunning at the first curve 1 and third curve 4 It is dynamic (because rotor assembly when rotated its blade/scraper plate can sliding in the radial direction inside measuring room, with in measuring room Wall holding continuously contacts with, and two curves are therefore sliding is not present in standard circular arc herein), 4 upper scraping plate of third curve with it is interior Wall is face contact, and on the first curve 1, and scraper plate with inner wall is that line contacts and (shows point A, B after taking section), and in the second song On line 8 and the 4th curve 9, scraper plate then radially slide (in section the contact point of upper scraping plate and inner wall be always 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.

Condition two: for convenient for the link position relationship between statement response curve, the second curve 8 and the 4th curve 9 are divided It is not divided into 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, then first The back segment 6 of the leading portion 2 of curve 1 and the second curve, the 4th curve；The back segment 3 and the 4th curve of third curve 4 and the second curve Leading portion 5；The leading portion 2 of second curve and (back segment 3 of the second curve), the leading portion 5 of the 4th curve and the back segment 6 of the 4th curve are smooth Transition (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 8, first assuming that scraper plate is straight line (4 radius R of third curve, 1 radius r of the first curve, second curve Leading portion 2, the second curve back segment 3 be 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 2 θ of sin, just have this Situation 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 9:

M1 and M are linked up, and when OM1 goes to the angle that OM is passed through, which can regard as

Then:

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 M (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. 2-3, 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.

The above embodiments are only illustrative of the principle and efficacy of the utility model, and not for limitation, this is practical new Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the revealed essence of the utility model All equivalent modifications or change completed under mind and technical idea, should be covered by the claim of the utility model.

Claims (6)

1. a kind of measuring room of blade flowmeter including measuring room cavity and the import being respectively communicated with measuring room cavity and goes out Mouthful, the inlet and outlet is arranged on the side wall of measuring room cavity；It is characterized by: measuring room cavity cross section is in convex Take turns profile shape, the cam contour surrounds by 4 curves, including the first curve that radius is r, radius be R third curve and R > r, the first curve and the setting of third curve face and the center of circle of the first curve is located in the shaft of measuring room inner rotator, the It is respectively equipped with that shape is identical and the second curve and the 4th curve of the arrangement that is mutually symmetrical between one curve and third curve, so that Four curves surround the cam profile curve.

2. the measuring room of blade flowmeter according to claim 1, it is characterised in that: second curve and the 4th curve The expression formula of curve ρ 1 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 of blade flowmeter according to claim 1 or claim 2, it is characterised in that: the inlet and outlet also about The axis of symmetry is symmetrical.

4. the measuring room of blade flowmeter according to claim 3, it is characterised in that: the import is arc-shaped by one First diversion trench and measuring room cavity connection, first diversion trench are in the metering room housing of the first curve position One interlayer space.

5. the measuring room of blade flowmeter according to claim 4, it is characterised in that: second curve and the 4th curve are equal Including 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 It is connected；For the 4th curve, leading portion is connected with the other end of third curve, and back segment is connected with the other end of the first curve；Institute Intersectional region of the leading portion region of the second curve between first diversion trench and measuring room cavity is stated, section is located at thereafter It is radially projecting in metering chamber interior walls on spaced several layers water conservancy diversion gusset on, the water conservancy diversion gusset in circular arc plate and its Circular arc concave surface is surface where back segment；It is the second diversion trench that arc-shaped groove is formed by between adjacent two water conservancy diversion gusset, described Second diversion trench smoothly connects integrally with the first diversion trench, and intersection is first diversion trench and metering between two diversion trenches Intersectional region between chamber body.

6. the measuring room of blade flowmeter according to claim 5, it is characterised in that: the leading portion institute of the 4th curve is in place The place of setting also is provided with several water conservancy diversion gussets, about the axis of symmetry between two groups of water conservancy diversion gussets on the second curve and the 4th curve Symmetrically, the back segment of the 4th curve by the first curve part institute face metering room housing be equipped with for separate the import and The separation muscle of outlet, the separation muscle are in " people " font, and tip portion separates the inlet and outlet, and two towards meter It measures one that indoor extends in curved two branch to be linked together with the metering chamber interior walls where the interlayer space, another Leading portion bending towards the 4th curve extends and does not protrude into measuring room cavity, so that one buffer stream of shape between two branches The buffer area of body.