CN103397992A - Single-swash plate staggered-phase bi-directional plunger pump - Google Patents

Abstract

The invention provides a single-swash plate staggered-phase bi-directional plunger pump, belongs to the technical field of control hydraulic pressure hydromechanics, and aims to solve the problems existing in the prior art that flow is small, pulsation is large and operation is unstable. The single-swash plate staggered-phase bi-directional plunger pump comprises a transmission shaft, a swash plate, a shell body, left plungers and right plungers. The swash plate is fixed on the transmission shaft through splines; the left plungers are evenly distributed on the left end face of the swash plate in a circumference mode, wherein the number of the left plungers is m; the right plungers are evenly distributed on the right end face of the swash plate in a circumference mode, wherein the number of the right plungers is n; the transmission shaft, the swash plate, the left plungers and the right plungers are located in the shell body as a whole; the diameter of the circumference where the left plungers are distributed is the same as the diameter of the circumference where the right plungers are distributed; the installation angle of the m left plungers and the installation angle of the n right plungers differ by half of a work period; a motor drives the swash plate to rotate through the transmission shaft and then drives the left plungers and the right plungers to work. According to the single-swash plate staggered-phase bi-directional plunger pump, the structure that the plungers are symmetrically arranged on the left side and the right side of the single swash plate is adopted, therefore, the axial force of the plunger pump is reduced, and work precision is improved; the plungers on the two sides of the swash plate are staggered by half of the work period according to the design and work simultaneously, therefore, the instantaneous flow rate is doubled, and the flow pulsation is reduced to one quarter that of the original flow.

Description

The intertwining phase place bidirectional ram pump of monocline

Technical field

The invention belongs to and control the Hydro-mechanics technical field, be specifically related to the intertwining phase place bidirectional ram pump of a kind of monocline.

Background technique

Oil hydraulic pump is energy conversion elements, the mechanical energy of motor is changed into the hydraulic energy of fluid, is the key link of Hydraulic Power Transmission System, directly affects the performance of whole machine and the stability of work.When traditional oil hydraulic pump works, because its flow pulsation is large and the working pressure unstability, can produce many harmful effects to the work of machine, cause the fluid conduit failure, cause that hydraulic element are destroyed, ineffective or operating accuracy is not high, thus cause that the irregular vibration of each several part original paper in installations produces noise.

Publication number is that the Chinese patent of CN2247728 discloses a technological scheme that denomination of invention is Double swashplate two-way flow axial plunger pump, this plunger pump comprises that transmission shaft, pump case, swash plate, bimetallic plates and upper and lower plunger pump form, upper and lower plunger pump is arranged on the upper/lower terminal of pump case, bimetallic plates are arranged among pump case, swash plate is arranged on transmission shaft, transmission shaft is arranged on the centre of pump case and upper and lower plunger pump, and upper and lower plunger pump uses same transmission shaft connection for transmission.This plunger pump is equivalent to two axial piston pumps are installed together simultaneously and work, and, although increased the instantaneous working flow of product, has improved working pressure, and the flow pulsation of plunger pump does not have substantial variation.

Summary of the invention

The object of the invention is to propose the intertwining phase place bidirectional ram pump of a kind of monocline, solve prior art and have that flow is little, pulsation is large, the problems such as job insecurity, reduce and avoid that each element in whole hydraulic system periodically vibrates, creeps, noise.

For achieving the above object, the intertwining phase place bidirectional ram pump of monocline of the present invention comprises transmission shaft, swash plate, housing, left plunger and right plunger; Described swash plate is fixed on described transmission shaft by spline, a described m left plunger and described n right plunger circumference uniform distribution is on the left side and right side of described swash plate, described transmission shaft, swash plate, left plunger and right plunger integral body are positioned at described enclosure interior, described left plunger is identical with the diameter of the circumference that right plunger distributes, described m left plunger and n right plunger setting angle differ the operation cycle half, motor drives described swash plate by described transmission shaft and rotates, and then drives described left plunger and right plunger work.

Described plunger pump also comprises left oil outlet, left oil inleting port, left filling valve, left gap hydraulic fluid port, right oil outlet, right filler opening, right filling valve and right end clearance hydraulic fluid port; Described left oil outlet and described right oil outlet are communicated with left bank oil pocket and right oil-discharging cavity respectively, and described left oil inleting port and described right filler opening are communicated with described left oil sucting cavity and right oil sucting cavity respectively; Described left filling valve be connected right filling valve respectively with left plunger be connected plunger and be connected, described housing top has described left gap hydraulic fluid port and right end clearance hydraulic fluid port.

The number m of described left plunger and the number n of described right plunger are equal, and the span of described m and n is: m 〉=6, n 〉=6.

Described swash plate is provided with bearing hole and piston shoes hole, and the bearing hole of described swash plate is connected with described housing by bearing, and described left plunger and described right plunger coordinate with described piston shoes hole respectively.

Beneficial effect of the present invention is: compared with prior art, the intertwining phase place bidirectional ram pump of monocline of the present invention has improved traditional plunger pump structure, use the monocline right plunger symplex structure of facing left, the plunger misphase position half period design of swash plate both sides, and work simultaneously, instantaneous flow doubles, flow pulsation reduces to original 1/4th, due to the reverse axial force that interacts, therefore reduce the plunger pump axial force, improve operating accuracy; Monocline dish double plunger pump of the present invention has been realized twice co-operation in left and right, completes the oil suction oil extraction, with traditional plunger pump, compares, the plunger that has been equivalent to increase by one times is realized to-and-fro motion, increased the work cavity volume, rated pressure doubles, and has solved traditional little problem of plunger pump pressure; The intertwining phase place bidirectional ram pump of monocline adopts the obliquity structures such as left and right sides plunger and thrust plate, and the installation of plunger differs half period with operating angle simultaneously, the pulsating quantity of the air-quantity chart gained of plunger pump is reduced to 1/4 of common plunger pump, reduce and avoid each element in whole hydraulic system to do periodic vibration, improving operating accuracy.

Description of drawings

Fig. 1 is the intertwining phase place bidirectional ram pump of monocline of the present invention overall structure erection drawing;

Fig. 2 is the plunger motion sketch of plunger pump of the present invention;

Fig. 3 is that the pipeline of plunger pump of the present invention connects sketch;

Fig. 4 is the oblique disk structure figure in plunger pump of the present invention;

Fig. 5 is the A-A sectional view of Fig. 2;

Fig. 6 is the B-B sectional view of Fig. 2;

Fig. 7 is single plunger pump air-quantity chart figure;

Fig. 8 is the intertwining phase place bidirectional ram pump of monocline instantaneous flow simulation curve figure;

Wherein: 1, right oil outlet, 2, right filling valve, 3, right plunger, 4, right end clearance hydraulic fluid port, 5, swash plate, 6, left gap hydraulic fluid port, 7, left plunger, 8, left filling valve, 9, left oil outlet, 10, left oil inleting port, 11, bearing, 12, right filler opening, 13, right filling valve, 14, transmission shaft, 15, total oil-discharging cavity, 16, left bank oil pocket, 17, left oil sucting cavity, 18, total oil sucting cavity, 19, pipeline A, 20, right oil sucting cavity, 21, right oil-discharging cavity, 22, pipeline B, 23, bearing hole, 24, piston shoes hole, 25, the left side plunger ports, 26, the right side plunger ports.

Embodiment

Below in conjunction with accompanying drawing, the present invention is described further.

Referring to accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 5 and accompanying drawing 6, the intertwining phase place bidirectional ram pump of monocline of the present invention comprises transmission shaft 14, swash plate 5, housing, left plunger 7 and right plunger 3; Described swash plate 5 is fixed on described transmission shaft 14 by spline, described 6 left plungers 7 and described 6 right plunger 3 circumference uniform distributions are on the left side and right side of described swash plate 5, described transmission shaft 14, swash plate 5, left plunger 7 and right plunger 3 integral body are positioned at described enclosure interior, described left plunger 7 is identical with the diameter of the circumference that right plunger 3 distributes, described m left plunger 7 and n right plunger 3 setting angles differ the operation cycle half, motor drives described swash plate 5 by described transmission shaft 14 and rotates, and then drives described left plunger 7 and 3 work of right plunger.

Described plunger pump also comprises left oil outlet 9, left oil inleting port 10, left filling valve 8, left gap hydraulic fluid port 6, right oil outlet 1, right filler opening 12, right filling valve 2,13 and right end clearance hydraulic fluid port 4; Described left plunger 7 and right plunger 3 communicate with top by axial bore, radial hole, have cut skewed slot on the head cylndrical surface of described left plunger 7 and described right plunger 3, change fuel delivery per cycle; Be shaped with on plunger bushing into, spill port, all with the high and low pressure oil pocket in the pump housing, communicate, left oil outlet 9 as herein described and described right oil outlet 1 are communicated with left bank oil pocket 16 and right oil-discharging cavity 21 respectively.

Left filling valve 8 and right filling valve 2, the 13rd, a kind of one-way valve, when acting on spring pressure, valve upper cone face contacts with the valve seat sealing, and its effect is when fuel cut-off, high-pressure oil pipe and plunger upper end cavity volume is isolated, prevent that the oil in high-pressure oil pipe from blowing back in Injection Pump.The bottom of oiling valve is cross section, can lead, and diesel oil is passed through.A little cylndrical surface is arranged under the conical surface of outlet valve, be called the decompression endless belt, its effect is at fuel feeding at the end, and the oil pressure in high-pressure oil pipe is descended rapidly, avoids spray orifice to produce the oil dripping phenomenon.The top volume is increased fast, and pressure reduces rapidly, and stop-spraying is rapid.Described left filling valve 8 be connected right filling valve 2,13 respectively with left plunger 7 be connected plunger 3 and be connected, described housing top has described left gap hydraulic fluid port 6 and right end clearance hydraulic fluid port 4.

Referring to accompanying drawing 4, described swash plate 5 is provided with bearing hole 23 and piston shoes hole 24, and the bearing hole 23 of described swash plate 5 is connected with described housing by bearing 11, and described left plunger 7 and described right plunger 3 coordinate with described piston shoes hole 24 respectively.

Monocline dish double-plunger misphase position oil hydraulic pump overall structure adopts the swash plate 5 at an inclination angle such as two-sided to complete and piston valving work, and the left plunger 7 of swash plate 5 left and right sides and the common to-and-fro motion of right plunger 3, complete separately oil suction and oil extraction work simultaneously.therefore, when monocline dish double-plunger misphase position oil hydraulic pump works, pipeline connects as shown in Figure 3: left oil sucting cavity 17 and the right oil sucting cavity 20 use pipeline A19 of the swash plate 5 left plungers 7 in the left and right sides and right plunger 3 are connected to form total oil sucting cavity 18, left bank oil pocket 16 and the right oil-discharging cavity 21 use pipeline B22 of the swash plate 5 left plungers 7 in the left and right sides and right plunger 3 are connected to form total oil-discharging cavity 15, and the operating angle that the operating angle that right side plunger ports 26 is installed and left side plunger ports 25 are installed differs the plunger motion cycle half, guarantee the stack of both sides flow curve when Wave crest and wave trough, reduce flow pulsation.

Motor drives transmission shaft 14 and drives inclination angle swash plate 5 rotations such as two-sided, and the to-and-fro motion simultaneously of left and right sides plunger, realize oil suction oil extraction work, and the plunger that is distributed in simultaneously swash plate 5 circumference is done cyclical movement, and the cycle of motion is

Wherein z represents number of plungers.

The inclination angle symplex structures such as described swash plate 5 employings, purpose are to make left and right sides work piston valving condition identical, make its working environment identical.

The intertwining phase place bidirectional ram pump of monocline working principle is as follows: motor driving transmission shaft 14 drive swash plates 5 are done circumference and are rotatablely moved, the left and right plunger 3 that is in contact with it is done linear reciprocating motion simultaneously, when first plunger is done compression movement, volume diminishes, it is large that pressure becomes, fluid is discharged by right oil drain out and left oil outlet 9, realizes the oil extraction process.When first plunger was done stretching exercise, it is large that volume becomes, and pressure diminishes, and fluid sucks by right filler opening 12 and left oil inleting port 10, realizes oil-absorbing process.Left plunger 7 is for being distributed in the plunger at swash plate 5 left circumference tops, and right plunger 3 is the plungers that are distributed in swash plate 5 circumference tops, right side, and both sides plunger setting angle differs the operation cycle half, but works simultaneously, guarantees the additivity of flow curve.

The intertwining phase place bidirectional ram pump of monocline increases working pressure, reduces the principle of flow pulsation: producing air-quantity chart during single plunger work is periodicity trigonometric function curve, the curve of the instantaneous flow that produces during two plunger co-operation is equivalent to two periodically trigonometric function curve combinings, the angle of the half period that when therefore two plungers make up, staggered in the work phase angle of two plungers, its geometric meaning is that the stagger phase place of half period of the trigonometric function curve of two same waveform as superposes, amplitude doubles, and the amplitude variable quantity reduces 1/4th.

If pressure, flow and instantaneous flow that left plunger 7 and right plunger 3 produce are respectively p ₁, p ₂, Q ₁, Q ₂, (Q _sh) ₁, (Q _sh) ₂, pressure, flow and the instantaneous flow of the intertwining phase place bidirectional ram pump of monocline are p, Q, Σ (Q _sh), formula (1) is arranged:

$\left\{\begin{array}{c}{\mathrm{<figure-callout\; id="1"\; label="p"\; filenames="HDA00003627897100031.png,HDA00003627897100032.png"\; state="\{\{state\}\}">p</figure-callout>}}_1=p_2\\ {\mathrm{<figure-callout\; id="1"\; label="Q"\; filenames="HDA00003627897100031.png,HDA00003627897100032.png"\; state="\{\{state\}\}">Q</figure-callout>}}_1=Q_2\\ Q=Q_1+{\mathrm{<figure-callout\; id="2"\; label="Q"\; filenames="HDA00003627897100011.png"\; state="\{\{state\}\}">Q</figure-callout>}}_2\\ \mathrm{\&Sigma;}\left(Q_{\mathrm{sh}}\right)={\left(Q_{\mathrm{sh}}\right)}_1+{\left(Q_{\mathrm{sh}}\right)}_2\end{array}\right.---\left(1\right)$

When the plunger of the left and right sides was even number: the corner while establishing left plunger 7 and 3 work of right plunger was respectively

Due to

The operation cycle that represents single plunger, so the work phase angle of left and right plunger 3 differs half period,

For the operating angle of right plunger 3 with respect to left plunger 7 hysteresis.

Instantaneous flow (Q _sh) ₁(Q _sh) ₂Shown in formula (2) and formula (3):

Wherein,

For the performance parameter of product, because

Fall behind

In

Angle, in order to realize

Should meet the operating angle shown in formula (4):

Derive and draw the Σ (Q shown in formula (5) and formula (6) through mathematical formulae (1), formula (2), formula (3) and formula (4) _sh) _maxAnd Σ (Q _sh) _min:

$\mathrm{\&Sigma;}{\left(Q_{\mathrm{sh}}\right)}_{\max }=\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="HDA00003627897100011.png"\; state="\{\{state\}\}">k</figure-callout>}\frac{2\cos \frac{\mathrm{\&pi;}}{2z}}{\sin \frac{\mathrm{\&pi;}}{z}}---\left(5\right)$

$\mathrm{\&Sigma;}{\left(Q_{\mathrm{sh}}\right)}_{\min }=\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="HDA00003627897100011.png"\; state="\{\{state\}\}">k</figure-callout>}\frac{2\cos \frac{\mathrm{\&pi;}}{2z}\cos \frac{\mathrm{\&pi;}}{2z}}{\sin \frac{\mathrm{\&pi;}}{z}}---\left(6\right)$

Formula (7) is the instability of flow property coefficient:

$\mathrm{\&delta;}=\frac{\mathrm{\&Sigma;}{\left(Q\right)}_{\max }-\mathrm{\&Sigma;}{\left(Q\right)}_{\min }}{{\left(Q_t\right)}_1+{\left(Q_t\right)}_2}=\frac{k\tan \frac{\mathrm{\&pi;}}{4z}}{2Q_t}=\frac{\mathrm{\&pi;}}{2z}\tan \frac{\mathrm{\&pi;}}{4z}---\left(7\right)$

Wherein, Q _tExpression plunger pump mean flowrate, k is particular product performance parameters, and Q is the plunger pump instantaneous flow, and z is the intertwining phase place of monocline to the number of plunger being installed in plunger pump.

The flow pulsation coefficient of the intertwining phase place bidirectional ram pump of monocline flow pulsation coefficient and common plunger pump is the business and is obtained formula (8):

Wherein: z represents the intertwining phase place of monocline to the number of plunger is installed in plunger pump, and due to z 〉=1, equation the right exists a maximum value to be

Therefore the flow pulsation coefficient of the intertwining phase place bidirectional ram pump of monocline be to the maximum common plunger pump flow pulsation 1/4th.

In like manner, when the plunger quantity in the intertwining phase place bidirectional ram pump of monocline is odd number; The derivation of its flow pulsation is the same.Conclusion: the flow pulsation coefficient of the intertwining phase place bidirectional ram pump of monocline flow pulsation coefficient and common plunger pump is the business and is obtained formula (9):

In formula, z represents to install in the intertwining phase place bidirectional ram pump of monocline the number of plunger, and due to z 〉=1, equation the right exists a maximum value to be

Therefore the flow pulsation coefficient of the intertwining phase place bidirectional ram pump of monocline be to the maximum common plunger pump flow pulsation 1/4th.

Monocline dish double-plunger misphase in this paper position axial piston pump, through theory analysis and Practical Calculation, the instantaneous flow of its pump equals two times of common plunger pump flow, and ripple factor reduces, and pulsation rate is 1/4 of conventional pump to the maximum.The instantaneous flow unstability that has solved conventional hydraulic pumps working pressure large, that produce can not meet the machine demand, working pressure is difficult to stable problem, reduces and avoids each several part element in whole installations to do the vibration of erratic behavior and the noise that causes.Research and hydraulicdriven machine to hydraulic pump product have using value.

referring to accompanying drawing 7, the air-quantity chart that the driving ram pump produces is periodicity trigonometric function curve, because the plunger of the oil hydraulic pump left and right sides, monocline dish double-plunger misphase position carries out oil suction oil extraction work simultaneously, therefore to be equivalent to two amplitudes identical for its air-quantity chart, the trigonometric function curve combining that cycle is the same, again because the operating angle of left and right sides plunger differs half of single plunger motion cycle, therefore the geometric meaning of the intertwining phase place bidirectional ram pump of monocline air-quantity chart is two duplicate trigonometric function curves curves of half period phase place (namely two periodically the Wave crest and wave trough of curves mutually superpose) generation that stagger.Its amplitude superposes mutually, and the amplitude variable quantity is folded subtracting mutually.

Referring to accompanying drawing 8, the intertwining phase place bidirectional ram pump of expression monocline instantaneous flow simulation curve figure, a represents that number of plungers is the 6 o'clock intertwining phase place bidirectional ram pump of monocline air-quantity charts, b represents that number of plungers is 6 o'clock conventional pump instantaneous flow dotted lines, the intertwining phase place bidirectional ram pump of monocline flow doubles as seen from the figure, and flow pulsation is reduced to 1/4 of conventional pump.

Be more than the specific embodiment of the present invention, but limitation of the present invention absolutely not.

Claims (4)

1. the intertwining phase place bidirectional ram pump of monocline, is characterized in that, comprises transmission shaft (14), swash plate (5), housing, left plunger (7) and right plunger (3), described swash plate (5) is fixed on described transmission shaft (14) by spline, described m left plunger (7) and described n right plunger (a 3) circumference uniform distribution is on the left side and right side of described swash plate (5), described transmission shaft (14), swash plate (5), left plunger (7) and right plunger (3) integral body are positioned at described enclosure interior, described left plunger (7) is identical with the diameter of the circumference that right plunger (3) distributes, described m left plunger (7) and n right plunger (3) setting angle differ the operation cycle half, motor drives described swash plate (5) by described transmission shaft (14) and rotates, and then drive the work of described left plunger (7) and right plunger (3).

2. the intertwining phase place bidirectional ram pump of monocline according to claim 1, it is characterized in that, described plunger pump also comprises left oil outlet (9), left oil inleting port (10), left filling valve (8), left gap hydraulic fluid port (6), right oil outlet (1), right filler opening (12), right filling valve (2,13) and right end clearance hydraulic fluid port (4); Described left oil outlet (9) and described right oil outlet (1) are communicated with left bank oil pocket (16) and right oil-discharging cavity (21) respectively, and described left oil inleting port (10) and described right filler opening (12) are communicated with respectively at described left oil sucting cavity (17) and right oil sucting cavity (20); Described left filling valve (8) be connected right filling valve (2,13) respectively with left plunger (7) be connected plunger (3) and be connected, described housing top has described left gap hydraulic fluid port (6) and right end clearance hydraulic fluid port (4).

3. the intertwining phase place bidirectional ram pump of monocline according to claim 1, is characterized in that, the number n of the number m of described left plunger (7) and described right plunger (3) is equal, and the span of described m and n is: m 〉=6, n 〉=6.

4. the intertwining phase place bidirectional ram pump of monocline according to claim 1, it is characterized in that, described swash plate (5) is provided with bearing hole (23) and piston shoes hole (24), the bearing hole (23) of described swash plate (5) is connected with described housing by bearing (11), and described left plunger (7) and described right plunger (3) coordinate with described piston shoes hole (24) respectively.

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