CN100447411C - Piston pump drive device - Google Patents

Abstract

The invention discloses a piston pump driving device, which is a cylinder, wherein a curve groove is arranged on the side surface of the cylinder, and the curve of the curve groove is formed by combining the following two quadratic curve equations: y 1-k (x-a/4) < 2 > -A (0 ≦ x ≦ a/2), y 2-k (x-3a/4) < 2 > + A (a/2 ≦ x ≦ a), A ═ ka 2/16, wherein: κ is a positive number; a is the perimeter of the bottom surface of the cylinder; y 1 is a first curve equation; and y 2 is a second curve equation. When the cylinder rotates at a constant speed, the end of the piston rod of the piston pump slides along the curved groove in the vertical direction, the moving speed of the piston is a linear function of time t, and then the output liquid flow is constant through the combination of 4n (n is a natural number) piston pumps. As a driving device of the piston pump, the invention has simple structure, and the output liquid flow of the single piston pump is a continuous function, so the problem of step change does not exist, and the cost performance is improved.

Description

Piston pump driving mechanism

Technical field

The present invention relates to the technical field of hydraulic power system in the machinery, specifically, is a kind of piston pump driving mechanism of new structure.

Background technique

Existing oil hydraulic pump or equipment for liquid transportation can not make liquid output (or input) flow G=c (c is a constant) mostly, though rotary piston pump can solve problem in this respect at present, but structure is complicated, movable part is many, and alternately the pair of pistons of acting exists the step of G from 0 to c to change, the be under pressure test of step response of the pressure-bearing boundary of device.

The present invention considers to solve the step variation issue of liquid output or input flow rate from reciprocating pump driving mechanism aspect, use comparatively simple method and less component, reaches the effect of G=c (c is a constant).

Summary of the invention

The present invention is exactly in order to solve the problem of reciprocating pump output liquid constant flow, and a kind of piston pump driving mechanism is provided.

For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:

A kind of piston pump driving mechanism, described drive unit are a cylindrical body, and described cylindrical side is provided with curvilinear groove, and the curve of described curvilinear groove is combined by following two quadratic curve equations:

${\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="C20071001370700131.png,C20071001370700151.png"\; state="\{\{state\}\}">y</figure-callout>}}_1=\mathrm{\&kappa;}{(\mathrm{\&chi;}-\frac{a}{4})}^2-A$ $(0\&le;\mathrm{\&chi;}\&le;\frac{a}{2});$

${\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="C20071001370700111.png,C20071001370700112.png"\; state="\{\{state\}\}">y</figure-callout>}}_2=-\mathrm{\&kappa;}{(\mathrm{\&chi;}-\frac{3a}{4})}^2+A$ $(\frac{a}{2}\&le;\mathrm{\&chi;}\&le;a)$

A＝κa ²/16

Wherein: a is a described cylindrical bottom surface girth; κ is a positive number; y ₁It is first curvilinear equation; y ₂It is second curvilinear equation, the axis of ordinates of described quadratic curve equation place system of coordinates is cylindrical bus, the tangent line at the place, stationary point of axis of abscissas and described curve is parallel, and and the distance of two tangent lines equates, described point of inflexion on a curve is positioned on the axis of abscissas, initial point is positioned on the described curve, and the tangent slope of described curve at the initial point place is negative value.

For the piston rod that makes things convenient for reciprocating pump is connected on the described drive unit, be provided with slide block in the described curvilinear groove, a piston rod is installed a slide block.This slide block is a cylindrical body, its size is much smaller than the described cylinder dimensions of piston pump driving mechanism of the present invention, height is greater than the degree of depth of described curvilinear groove, bottom surface diameter and described curvilinear groove width equate, one end is installed on the piston rod, and the other end inserts in the described curvilinear groove, can slide in described curvilinear groove, and its intersect vertical axis is in described cylindrical axis, and the track of the axis of slide block and described cylindrical body side intersection point is the described curve of curvilinear equation.

Compared with prior art, advantage of the present invention and good effect are:

Piston pump driving mechanism of the present invention is a cylindrical body that has curvilinear groove on the side, when cylindrical body rotates with constant speed, the piston rod end of reciprocating pump is made Vertical direction along curvilinear groove and is slided, the movement velocity of piston is the linear function of time t, by the combination of the individual reciprocating pump of 4n (n is a natural number), make that the fluid flow of output is a steady state value then.As the drive unit of reciprocating pump, the present invention is simple in structure, and single reciprocating pump output liquid flow is continuous function, does not have the step variation issue, and cost performance improves.

Description of drawings

Fig. 1 is the structural representation of piston pump driving mechanism of the present invention;

Fig. 2 is that schematic representation is launched in piston pump driving mechanism t=0 of the present invention side constantly;

Fig. 3 is the side unfolded drawing of piston pump driving mechanism t=0 of the present invention when connecting reciprocating pump constantly;

Fig. 4 is the three-dimensional user mode figure of piston pump driving mechanism t=0 of the present invention when connecting reciprocating pump constantly;

Plan view when Fig. 5 is the connection reciprocating pump of piston pump driving mechanism of the present invention;

Fig. 6 is the reciprocating pump 4-1 flow curve schematic representation of piston pump driving mechanism of the present invention;

Fig. 7 is the reciprocating pump 4-2 flow curve schematic representation of piston pump driving mechanism of the present invention;

Fig. 8 is the reciprocating pump 4-3 flow curve schematic representation of piston pump driving mechanism of the present invention;

Fig. 9 is the reciprocating pump 4-4 flow curve schematic representation of piston pump driving mechanism of the present invention;

Figure 10 is the total-flow-rate curve schematic representation of piston pump driving mechanism of the present invention;

Figure 11 is the t=0 moment side unfolded drawing that the another kind of piston pump driving mechanism of the present invention connects the reciprocating pump mode;

Wherein: 1 cylindrical body; 2 curvilinear grooves; 3 slide blocks; 3-1,3-2,3-3,3-4 slide block; 4 reciprocating pumps; The 4-1 reciprocating pump; The 4-2 reciprocating pump; The 4-3 reciprocating pump; The 4-4 reciprocating pump; 5 pistons; 6 piston rods; 6-1 piston rod fixed cover; 7 output fuel tanks; 8 input fuel tanks; 9 safety check; 10 pipelines; The flow curve of 11 reciprocating pump 4-1; The flow curve of 12 reciprocating pump 4-2; The flow curve of 13 reciprocating pump 4-3; The flow curve of 14 reciprocating pump 4-4; 15 total input flow rate curves; 16 total output flow curves;

ω _tBe the cylindrical body angular velocity of rotation, r is a cylindrical bottom surface radius, and a is a cylindrical bottom surface girth, and t is any time, and the cylinder height is slightly larger than 2A, and S is a piston area.

Embodiment

The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.

Embodiment one, and piston pump driving mechanism of the present invention is the cylindrical body 1 that a side has curvilinear groove 2, and curvilinear equation is ${\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="C20071001370700131.png,C20071001370700151.png"\; state="\{\{state\}\}">y</figure-callout>}}_1=\mathrm{\&kappa;}{(\mathrm{\&chi;}-\frac{a}{4})}^2-A$ $(0\&le;\mathrm{\&chi;}\&le;\frac{a}{2})$

${\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="C20071001370700111.png,C20071001370700112.png"\; state="\{\{state\}\}">y</figure-callout>}}_2=-\mathrm{\&kappa;}{(\mathrm{\&chi;}-\frac{3a}{4})}^2+A$ $(\frac{a}{2}\&le;\mathrm{\&chi;}\&le;a);$ A＝κa ²/16；

A is a described cylindrical bottom surface girth, and κ is a positive number.

Select 8 points on curve, its coordinate is as follows respectively: ω wherein _tBe cylindrical body 1 angular velocity of rotation, r is the bottom surface radius of cylindrical body 1, and a is the bottom surface girth of cylindrical body 1, and t is any time, and the cylinder height is 2A, and S is the area of piston 5.

Fixed point: 1. (0,0), 2. 3.

4.

Moving point: E (ω rt, y _E), $F(\mathrm{\&omega;rt}+\frac{a}{4},y_F),M(\mathrm{\&omega;rt}+\frac{a}{2},y_M),N(\mathrm{\&omega;rt}+\frac{3a}{4},y_N);$ y ₁For from the fixed point 1. (0,0) to the fixed point 2.

To fixing a point 3. Curvilinear equation, y ₂For from the fixed point 3.

To fixing a point 4. To the 1. curvilinear equation of (0,0) of fixing a point; Slide block 3-1,3-2,3-3, the 3-4 coordinate on curvilinear groove corresponding respectively moving some E, F, M, N.

Usage mode one:

The vertical-horizontal direction is equipped with four reciprocating pump 4-1,4-2,4-3,4-4, its model is identical with horizontal position, the piston position of initial time differs for four/one-period successively, its piston rod upper end is separately fixed on interval four some E of four/one-period, F, M, the N, its plan view as shown in Figure 5, great circle is a cylindrical body 1, four roundlets are respectively reciprocating pump 4-1,4-2,4-3,4-4, if when piston moves downward liquid is discharged, when moving upward liquid is sucked, inhalation flow be on the occasion of, discharge flow rate is a negative value.

System of coordinates is set as shown in Figure 2.

Wherein:

${\mathrm{<figure-callout\; id="1"\; label="y"\; filenames="C20071001370700131.png,C20071001370700151.png"\; state="\{\{state\}\}">y</figure-callout>}}_1=\mathrm{\&kappa;}{(\mathrm{\&chi;}-\frac{a}{4})}^2-A$ $(0\&le;\mathrm{\&chi;}\&le;\frac{a}{2});$

${\mathrm{<figure-callout\; id="2"\; label="y"\; filenames="C20071001370700111.png,C20071001370700112.png"\; state="\{\{state\}\}">y</figure-callout>}}_2=-\mathrm{\&kappa;}{(\mathrm{\&chi;}-\frac{3a}{4})}^2+A$ $(\frac{a}{2}\&le;\mathrm{\&chi;}\&le;a)$

A＝κa ²/16

A is a described cylindrical bottom surface girth; κ is a positive number; y ₁Be fixed point curvilinear equation 1.-2.-3., y ₂Be curvilinear equation from fixing a point 3.-4.-1..

But if discharge opeing body volume equation V (t)=(A+y) S in each reciprocating pump,

For an E, with moving axes (ω rt, the y of an E _E) substitution volume equation V (t)=(A+y) S:

$V\left(t\right)=\mathrm{\&kappa;}{(\mathrm{\&omega;rt}-\frac{a}{4})}^2\&CenterDot;S$ $(0\&le;t\&le;\frac{\mathrm{<figure-callout\; id="2"\; label="a"\; filenames="C20071001370700111.png,C20071001370700112.png"\; state="\{\{state\}\}">a</figure-callout>}}{2\mathrm{\&omega;r}}),$

$V\left(t\right)=-\mathrm{\&kappa;}{(\mathrm{\&omega;rt}-\frac{3a}{4})}^2\&CenterDot;S+2\mathrm{AS}$ $(\frac{\mathrm{<figure-callout\; id="2"\; label="a"\; filenames="C20071001370700111.png,C20071001370700112.png"\; state="\{\{state\}\}">a</figure-callout>}}{2\mathrm{\&omega;r}}\&le;t\&le;\frac{a}{\mathrm{\&omega;r}}),$

Flow equation then:

$\frac{\mathrm{dV}\left(t\right)}{\mathrm{dt}}=2\mathrm{\&kappa;S\&omega;r}(\mathrm{\&omega;rt}-\frac{a}{4})$ $(0\&le;t\&le;\frac{\mathrm{<figure-callout\; id="2"\; label="a"\; filenames="C20071001370700111.png,C20071001370700112.png"\; state="\{\{state\}\}">a</figure-callout>}}{2\mathrm{\&omega;r}}),$

$\frac{\mathrm{dV}\left(t\right)}{\mathrm{dt}}=-2\mathrm{\&kappa;S\&omega;r}(\mathrm{\&omega;rt}-\frac{3a}{4})$ $(\frac{\mathrm{<figure-callout\; id="2"\; label="a"\; filenames="C20071001370700111.png,C20071001370700112.png"\; state="\{\{state\}\}">a</figure-callout>}}{2\mathrm{\&omega;r}}\&le;t\&le;\frac{a}{\mathrm{\&omega;r}}),$

Obtain the flow of reciprocating pump 4-1 $G=\frac{\mathrm{dV}}{\mathrm{dt}}$ Curve as shown in Figure 6.

In like manner, will put F $(\mathrm{\&omega;rt}+\frac{a}{4},y_F),M(\mathrm{\&omega;rt}+\frac{a}{2},y_M),N(\mathrm{\&omega;rt}+\frac{3a}{4},y_N)$ Moving axes substitution volume equation V (t)=(A+y) S respectively:

The flow of reciprocating pump 4-2 $G=\frac{\mathrm{dV}}{\mathrm{dt}}$ Curve as shown in Figure 7,

The flow of reciprocating pump 4-3 $G=\frac{\mathrm{dV}}{\mathrm{dt}}$ Curve as shown in Figure 8,

The flow of reciprocating pump 4-4 $G=\frac{\mathrm{dV}}{\mathrm{dt}}$ Curve as shown in Figure 9.

Above-mentioned four reciprocating pump input flow rates are merged, and output flow merges, and obtains total discharge

Curve as shown in figure 10, visible total output flow equates with total input flow rate, and is steady state value

Any time t of this system then, the liquid total discharge that sucks or discharge is a definite value.

For the piston rod that makes things convenient for reciprocating pump is connected on the described drive unit, be provided with slide block in the described curvilinear groove.The quantity of corresponding connection piston rod, the quantity that slide block is installed.This slide block is an approximate circle cylinder, and height can slide in groove greater than the degree of depth of curvilinear groove, and its axis normal is in described cylindrical axis, and the track of the axis of slide block and cylindrical body side intersection point is the described curve of curvilinear equation.

Concrete movement process:

T=0 constantly, each pump state as shown in Figure 4, reciprocating pump 4-1,4-2,4-3,4-4, corresponding slide block is respectively 3-1,3-2,3-3,3-4,1. the corresponding points E of each slide block, F, M, N lay respectively at a little (0,0), 2.

3.

4.

When piston pump driving mechanism of the present invention is pressed direction shown in Figure 4, with angular velocity omega _tDuring rotation,

1, t=0 constantly, 1. slide block 3-1,3-2,3-3,3-4 respective coordinates E, F, M, N lay respectively at a little, 2., 3., 4.

Slide block 3-1 (E point) drives piston rod 6 and moves downward pump 4-1 discharge opeing to 2. motion;

Slide block 3-2 (F point) drives piston rod 6 and moves upward pump 4-2 imbibition to 3. motion;

Slide block 3-3 (M point) drives piston rod 6 and moves upward pump 4-3 imbibition to 4. motion;

Slide block 3-4 (N point) drives piston rod 6 and moves downward pump 4-4 discharge opeing to 1. motion;

2、 $t=\frac{a}{4\mathrm{\&omega;r}}$ Constantly, when slide block 3-1 (E point), 3-2 (F point), 3-3 (M point), 3-4 (N point) move to respectively 2., 3., 4., when 1. putting,

Slide block 3-1 (E point) drives piston rod 6 and moves upward pump 4-1 imbibition to 3. motion;

Slide block 3-2 (F point) drives piston rod 6 and moves upward pump 4-2 imbibition to 4. motion;

Slide block 3-3 (M point) drives piston rod 6 and moves downward pump 4-3 discharge opeing to 1. motion;

Slide block 3-4 (N point) drives piston rod 6 and moves downward pump 4-4 discharge opeing to 2. motion;

3、 $t=\frac{a}{2\mathrm{\&omega;r}}$ Constantly, when slide block 3-1 (E point), 3-2 (F point), 3-3 (M point), 3-4 (N point) move to respectively 3., 4., 1., when 2. putting,

Slide block 3-1 (E point) drives piston rod 6 and moves upward pump 4-1 imbibition to 4. motion;

Slide block 3-2 (F point) drives piston rod 6 and moves downward pump 4-2 discharge opeing to 1. motion;

Slide block 3-3 (M point) drives piston rod 6 and moves downward pump 4-3 discharge opeing to 2. motion;

Slide block 3-4 (N point) drives piston rod 6 and moves upward pump 4-4 imbibition to 3. motion;

4、 $t=\frac{3a}{4\mathrm{\&omega;r}}$ Constantly, when slide block 3-1 (E point), 3-2 (F point), 3-3 (M point), 3-4 (N point) move to respectively 4., 1., 2., when 3. putting,

Slide block 3-1 (E point) drives piston rod 6 and moves downward pump 4-1 discharge opeing to 1. motion;

Slide block 3-2 (F point) drives piston rod 6 and moves downward pump 4-2 discharge opeing to 2. motion;

Slide block 3-3 (M point) drives piston rod 6 and moves upward pump 4-3 imbibition to 3. motion;

Slide block 3-4 (N point) drives piston rod 6 and moves upward pump 44 imbibitions to 4. motion.

5、 $t=\frac{a}{\mathrm{\&omega;r}}$ Constantly, 1. slide block 3-1 (E point), 3-2 (F point), 3-3 (M point), 3-4 (N point) move to respectively, 2., 3., 4. point,

Wherein, output fuel tank 7 is the discharge opeing state by safety check 9 along pipeline 10 all the time, and input fuel tank 8 is the imbibition state by safety check 9 all the time.So, promptly finish a cyclic process, finish imbibition, the discharge opeing process of one-period.

Usage mode two:

As shown in figure 11, the shared slide block of reciprocating pump 4-1 and reciprocating pump 4-3, the shared slide block of reciprocating pump 4-2 and reciprocating pump 4-4, in the t=0 moment, 1. the E point is positioned at (0,0) point, and 2. the F point is positioned at

The point place, the vertical x axle of each sucker rod, each position of piston will differ for four/one-period.Other are with usage mode one.

In addition, institute's open curve groove on the cylindrical side of the present invention also can be the more than one cycle, and reciprocating pump can also be 8, and 4n (n is a natural number) is individual also can.Each pump horizontal position can be different, but necessary 4 one group, the slide block of every group of reciprocating pump and piston position must differ for 1/4 cycle successively.

Certainly; above-mentioned explanation is not to be limitation of the present invention; the present invention also is not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also should belong to protection scope of the present invention.

Claims (1)

1. piston pump driving mechanism, it is characterized in that: described drive unit is a cylindrical body, and described cylindrical side is provided with curvilinear groove, and the curve of described curvilinear groove is combined by following two quadratic curve equations:

$y_1=\mathrm{\&kappa;}{(\mathrm{\&chi;}-\frac{a}{4})}^2-A,(0\&le;\mathrm{\&chi;}\&le;\frac{a}{2})$

$y_2=-\mathrm{\&kappa;}{(\mathrm{\&chi;}-\frac{3a}{4})}^2+A,(\frac{a}{2}\&le;\mathrm{\&chi;}\&le;a)$

A＝κa ²/16

Wherein: κ is a positive number; A is a described cylindrical bottom surface girth; y ₁It is first curvilinear equation; y ₂It is second curvilinear equation, the axis of ordinates of described quadratic curve equation place system of coordinates is cylindrical bus, the tangent line at the place, stationary point of axis of abscissas and described curve is parallel, and and the distance of two tangent lines equates, described point of inflexion on a curve is positioned on the axis of abscissas, initial point is positioned on the described curve, and the tangent slope of described curve at the initial point place is negative value.

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