CN103397992B - The intertwining phase place bidirectional ram pump of monocline - Google Patents

Abstract

The intertwining phase place bidirectional ram pump of monocline belongs to controls Hydro-mechanics technical field, and object is to solve prior art and has that flow is little, pulsation is large, the problems such as job insecurity. The present invention includes power transmission shaft, swash plate, housing, left plunger and right plunger; Swash plate is fixed on power transmission shaft by spline, m left plunger and n right plunger circumference uniform distribution are on the left side and right side of swash plate, power transmission shaft, swash plate, left plunger and right plunger entirety are positioned at enclosure interior, left plunger is identical with the diameter of the circumference that right plunger distributes, m left plunger and n right plunger setting angle differ the work period half, motor drives described swash plate to rotate by described power transmission shaft, and then drives described left plunger and right plunger work. The present invention uses the monocline right plunger symmetrical structure of facing left, and reduces plunger displacement pump axial force, improves operating accuracy, the plunger misphase position half period design of swash plate both sides, and simultaneously working, and instantaneous delivery doubles, and flow pulsation reduces to original 1/4th.

Description

Single swash plate phase-staggered bidirectional plunger pump

Technical Field

The invention belongs to the technical field of hydraulic fluid mechanics control, and particularly relates to a single-swash-plate phase-staggered bidirectional plunger pump.

Background

The hydraulic pump is an energy conversion part, converts mechanical energy of the motor into hydraulic energy of fluid, is a central link of a hydraulic transmission system, and directly influences the performance of the whole machine and the stability of work. When a traditional hydraulic pump works normally, due to large flow pulsation and unstable working pressure, a plurality of adverse effects can be generated on the working of the machine, so that an oil pipeline is damaged, a hydraulic element is damaged, the hydraulic element is out of action or the working precision is low, and original components in the machine device vibrate irregularly, so that noise is generated.

Chinese patent publication No. CN2247728 discloses a technical scheme of a double-swash-plate duplex axial plunger pump, which comprises a transmission shaft, a pump housing, a swash plate, a bimetallic plate, an upper plunger pump and a lower plunger pump, wherein the upper plunger pump and the lower plunger pump are installed at the upper end and the lower end of the pump housing, the bimetallic plate is installed in the pump housing, the swash plate is installed on the transmission shaft, the transmission shaft is installed between the pump housing and the upper plunger pump and the lower plunger pump, and the upper plunger pump and the lower plunger pump are connected and driven by the same transmission shaft. The plunger pump is equivalent to two axial plunger pumps which are arranged together to work simultaneously, although the instantaneous working flow of the product is increased, and the working pressure is improved, the flow pulsation of the plunger pump has no substantial change.

Disclosure of Invention

The invention aims to provide a single-swash plate phase-staggered bidirectional plunger pump, which solves the problems of small flow, large pulsation, unstable work and the like in the prior art, and reduces and avoids the periodic vibration, creeping and noise of each element in the whole hydraulic system.

In order to achieve the purpose, the single-swash plate phase-staggered bidirectional plunger pump comprises a transmission shaft, a swash plate, a shell, a left plunger and a right plunger; the swash plate passes through the spline to be fixed on the transmission shaft, m left side plunger with a plurality of right side plunger circumference equipartitions are in on the left end face of swash plate and the right-hand member face, transmission shaft, swash plate, left side plunger and right side plunger wholly are located inside the casing, the diameter of the circumference that left side plunger and right side plunger distribute is the same, m left side plunger and a plurality of right side plunger installation angle of n differ half duty cycle, and the motor passes through the transmission shaft drives the swash plate rotates, and then drives left side plunger and right side plunger work.

The plunger pump also comprises a left oil outlet, a left oil inlet valve, a left clearance oil port, a right oil outlet, a right oil inlet valve and a right clearance oil port; the left oil outlet and the right oil outlet are respectively communicated with a left oil discharge cavity and a right oil discharge cavity, and the left oil inlet and the right oil inlet are respectively communicated with a left oil suction cavity and a right oil suction cavity; the left oil inlet valve and the right oil inlet valve are respectively connected with the left plunger and the right plunger, and the upper part of the shell is provided with the left gap oil port and the right gap oil port.

The number m of the left plungers is equal to the number n of the right plungers, and the value ranges of m and n are as follows: m is more than or equal to 6, and n is more than or equal to 6.

The swash plate is provided with a bearing hole and a slipper hole, the bearing hole of the swash plate is connected with the shell through a bearing, and the left plunger and the right plunger are respectively matched with the slipper hole.

The invention has the beneficial effects that: compared with the prior art, the single-swash-plate phase-staggered bidirectional plunger pump improves the structure of the traditional plunger pump, adopts a symmetrical structure of left and right plungers of a single swash plate, adopts a half-period design of the staggered phase of the plungers on two sides of the swash plate, works simultaneously, doubles the instantaneous flow, reduces the flow pulsation to one fourth of the original flow pulsation, and reduces the axial force of the plunger pump and improves the working precision due to the mutual reverse axial force; compared with the traditional plunger pump, the single-inclined-disc double-plunger pump realizes reciprocating motion by adding one time of plunger, increases a working cavity, doubles rated pressure and solves the problem of small pressure of the traditional plunger pump; the single-swash-plate phase-staggered bidirectional plunger pump adopts a structure with equal inclination angles of plungers on the left side and the right side and a port plate, the installation of the plungers and the simultaneous working angle are different by half a period, the pulsation value obtained by the instantaneous flow curve of the plunger pump is reduced to 1/4 of the ordinary plunger pump, the periodic vibration of each element in the whole hydraulic system is reduced and avoided, and the working precision is improved.

Drawings

FIG. 1 is an assembly view of the overall structure of a single swash plate phase-staggered bidirectional plunger pump of the present invention;

FIG. 2 is a schematic diagram of the plunger movement of the plunger pump of the present invention;

FIG. 3 is a schematic view of the piping connections of the plunger pump of the present invention;

FIG. 4 is a view showing the construction of a swash plate in the plunger pump of the present invention;

FIG. 5 is a cross-sectional view A-A of FIG. 2;

FIG. 6 is a cross-sectional view B-B of FIG. 2;

FIG. 7 is a graph of instantaneous flow for a single plunger pump;

FIG. 8 is a simulation graph of instantaneous flow of a single swash plate staggered phase bi-directional plunger pump;

wherein: 1. the oil pump comprises a right oil outlet, a right oil inlet valve, a right plunger, a right oil outlet, a right clearance oil port, a right oil outlet, a right plunger, a swash plate, a left oil inlet, a left plunger, a left oil inlet, a left oil outlet, a left oil inlet, a right oil inlet, a bearing, a right oil inlet, a right oil outlet, a left plunger, a right oil outlet, a left oil outlet, a right oil outlet, a left.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

Referring to fig. 1, 2, 3, 5 and 6, the single swash plate staggered phase bidirectional plunger pump of the present invention includes a drive shaft 14, a swash plate 5, a housing, a left plunger 7 and a right plunger 3; swash plate 5 is fixed through the spline on the transmission shaft 14, 6 individual left plunger 7 with 3 circumference equipartitions of individual right plunger are in on the left end face and the right-hand member face of swash plate 5, transmission shaft 14, swash plate 5, left plunger 7 and right plunger 3 wholly are located inside the casing, the diameter of the circumference that left side plunger 7 and right plunger 3 distribute is the same, half duty cycle is differed with 3 installation angle of n right plungers to m individual left plunger 7, and the motor passes through transmission shaft 14 drives swash plate 5 rotates, and then drives left plunger 7 and the work of right plunger 3.

The plunger pump also comprises a left oil outlet 9, a left oil inlet 10, a left oil inlet valve 8, a left clearance oil port 6, a right oil outlet 1, a right oil inlet 12, right oil inlet valves 2 and 13 and a right clearance oil port 4; the left plunger 7 and the right plunger 3 are communicated with the top through an axial hole and a radial hole, and inclined grooves are cut on the cylindrical surfaces of the heads of the left plunger 7 and the right plunger 3 to change the circulating oil supply amount; the plunger sleeve is provided with an oil inlet and an oil return hole which are communicated with a high-pressure oil chamber and a low-pressure oil chamber in the pump body, and the left oil outlet 9 and the right oil outlet 1 are respectively communicated with a left oil discharge chamber 16 and a right oil discharge chamber 21.

The left oil inlet valve 8 and the right oil inlet valves 2 and 13 are one-way valves, when the spring pressure is applied, the conical surface on the upper part of the valve is in closed contact with the valve seat, and the function of the one-way valve is to isolate the high-pressure oil pipe from the cavity on the upper end of the plunger when the oil supply is stopped, so that the oil in the high-pressure oil pipe is prevented from flowing back into the oil injection pump. The lower part of the oil inlet valve is a cross section, which can guide and lead diesel oil to pass through. A small cylindrical surface is arranged under the conical surface of the oil outlet valve, and is called a pressure reducing ring belt, and the function of the pressure reducing ring belt is to enable the oil pressure in the high-pressure oil pipe to be rapidly reduced when oil supply is finished, so that the oil dripping phenomenon at a spray hole is avoided. When the ring belt falls into the valve seat, the volume above the valve seat is rapidly increased, the pressure is rapidly reduced, and the spray is rapidly stopped. The left oil inlet valve 8 and the right oil inlet valves 2 and 13 are respectively connected with the left plunger 7 and the right plunger 3, and the upper part of the shell is provided with the left gap oil port 6 and the right gap oil port 4.

Referring to fig. 4, a bearing hole 23 and a slipper hole 24 are formed in the swash plate 5, the bearing hole 23 of the swash plate 5 is connected with the housing through a bearing 11, and the left plunger 7 and the right plunger 3 are respectively matched with the slipper hole 24.

The integral structure of the single-swash-plate double-plunger staggered-phase hydraulic pump adopts a swash plate 5 with two sides and equal inclination angles to complete flow distribution work with plungers, and a left plunger 7 and a right plunger 3 on the left side and the right side of the swash plate 5 reciprocate together to complete respective oil absorption and oil discharge work at the same time. Therefore, the pipeline connection when the single-inclined-disc double-plunger phase-staggered hydraulic pump works normally is as shown in fig. 3: the left oil suction cavity 17 and the right oil suction cavity 20 of the left plunger 7 and the right plunger 3 on the left and the right sides of the swash plate 5 are connected through a pipeline A19 to form a total oil suction cavity 18, the left oil discharge cavity 16 and the right oil discharge cavity 21 of the left plunger 7 and the right plunger 3 on the left and the right sides of the swash plate 5 are connected through a pipeline B22 to form a total oil discharge cavity 15, the working angle of the right plunger port 26 and the working angle of the left plunger port 25 are different by half of the movement period of the plungers, the superposition of flow curves on the two sides when peaks and troughs is ensured, and the flow pulsation is reduced.

The motor drives the transmission shaft 14 to drive the double-sided equal-inclination-angle swash plate 5 to rotate, the plungers on the left side and the right side reciprocate simultaneously to realize oil absorption and oil discharge, and the plungers distributed on the circumference of the swash plate 5 move periodically at the same time, wherein the movement period isWherein z represents the number of plungers.

The swash plate 5 adopts an equal-inclination-angle symmetrical structure, and aims to ensure that the flow distribution conditions of the working plungers on the left side and the right side are the same and the working environments are the same.

The working principle of the single-swash-plate phase-staggered bidirectional plunger pump is as follows: the motor drive transmission shaft 14 drives the swash plate 5 to do circular rotation motion, the left plunger 3 and the right plunger 3 which are in contact with the swash plate do reciprocating linear motion simultaneously, when the first plunger does compression motion, the volume is reduced, the pressure intensity is increased, oil is discharged through the right oil discharge port and the left oil discharge port 9, and the oil discharge process is realized. When the first plunger piston does stretching movement, the volume is increased, the pressure intensity is reduced, and oil is sucked through the right oil inlet 12 and the left oil inlet 10, so that the oil suction process is realized. The left plunger 7 is a plunger distributed at the top of the left circumference of the swash plate 5, the right plunger 3 is a plunger distributed at the top of the right circumference of the swash plate 5, the installation angles of the plungers at two sides are different by half of a working period, but the plungers work simultaneously, and the superposition of a flow curve is ensured.

The principle that the single-swash-plate phase-staggered bidirectional plunger pump increases working pressure and reduces flow pulsation is as follows: the instantaneous flow curve generated when a single plunger works is a periodic trigonometric function curve, and the instantaneous flow curve generated when two plungers work together is equivalent to the superposition of two periodic trigonometric function curves, so that the working phase angles of the two plungers are staggered by half period of angle when the two plungers are combined, the geometrical meaning of the method is that the two trigonometric function curves with the same waveform are staggered by half period of phase for superposition, the amplitude is doubled, and the amplitude variation is reduced by one quarter.

Let the pressure, flow and instantaneous flow generated by the left plunger 7 and the right plunger 3 be p respectively₁、p₂、Q₁、Q₂、(Q_sh)₁、(Q_sh)₂The pressure, the flow rate and the instantaneous flow rate of the single-swash-plate staggered-phase bidirectional plunger pump are p, Q and sigma (Q)_sh) Then, formula (1):

$\left\{\begin{array}{c}{p}_1=p_2\\ Q_1=Q_2\\ Q=Q_1+Q_2\\ \mathrm{\Σ}\left(Q_{\mathrm{sh}}\right)={\left(Q_{\mathrm{sh}}\right)}_1+{\left(Q_{\mathrm{sh}}\right)}_2\end{array}\right.---\left(1\right)$

when the plungers on the left and right sides are even numbers: the turning angles of the left plunger 7 and the right plunger 3 during working are respectivelyDue to the fact thatRepresenting the duty cycle of a single plunger, so that the operating phase angles of the left and right plungers 3 differ by half a cycleThe right plunger 3 is retarded relative to the left plunger 7The rear working angle.

Instantaneous flow (Q)_sh)₁And (Q)_sh)₂Is shown in formula (2) and formula (3):

wherein,is a performance parameter of the product becauseBehindIn thatAngle to realizeThenThe working angle shown in formula (4) should be satisfied:

deriving sigma (Q) shown in formula (5) and formula (6) through mathematical formula (1), formula (2), formula (3) and formula (4)_sh)_maxAnd Σ (Q)_sh)_min：

$\mathrm{\Σ}{\left(Q_{\mathrm{sh}}\right)}_{\max }=k\frac{2\cos \frac{\mathrm{\π}}{2z}}{\sin \frac{\mathrm{\π}}{z}}---\left(5\right)$

$\mathrm{\Σ}{\left(Q_{\mathrm{sh}}\right)}_{\min }=k\frac{2\cos \frac{\mathrm{\π}}{2z}\cos \frac{\mathrm{\π}}{2z}}{\sin \frac{\mathrm{\π}}{z}}---\left(6\right)$

Equation (7) is the flow instability coefficient:

$\mathrm{\δ}=\frac{\mathrm{\Σ}{\left(Q\right)}_{\max }-\mathrm{\Σ}{\left(Q\right)}_{\min }}{{\left(Q_t\right)}_1+{\left(Q_t\right)}_2}=\frac{k\tan \frac{\mathrm{\π}}{4z}}{2Q_t}=\frac{\mathrm{\π}}{2z}\tan \frac{\mathrm{\π}}{4z}---\left(7\right)$

wherein Q is_tThe average flow of the plunger pump is shown, k is a product performance parameter, Q is the instantaneous flow of the plunger pump, and z is the number of plungers installed in the plunger pump in the single-swash-plate staggered phase direction.

The flow pulsation coefficient of the single-swash-plate staggered-phase bidirectional plunger pump and the flow pulsation coefficient of the common plunger pump are subjected to quotient to obtain a formula (8):

wherein: z represents the number of the plungers installed in the plunger pump in the single swash plate staggered phase direction, and since z is larger than or equal to 1, the maximum value exists on the right side of the equationTherefore, the maximum flow pulsation coefficient of the single-swash-plate staggered-phase bidirectional plunger pump is one fourth of the flow pulsation coefficient of the common plunger pump.

Similarly, when the number of the plungers in the single-swash-plate phase-staggered bidirectional plunger pump is odd; the derivation process of the flow pulsation is the same. And (4) conclusion: the flow pulsation coefficient of the single-swash-plate staggered-phase bidirectional plunger pump and the flow pulsation coefficient of the common plunger pump are subjected to quotient obtaining formula (9):

in the formula, z represents the number of plungers installed in the single-swash-plate staggered-phase bidirectional plunger pump, and since z is larger than or equal to 1, the maximum value on the right side of the equation isTherefore, the maximum flow pulsation coefficient of the single-swash-plate staggered-phase bidirectional plunger pump is one fourth of the flow pulsation coefficient of the common plunger pump.

The single-swash-plate double-plunger staggered phase axial plunger pump has the advantages that through theoretical analysis and actual calculation, the instantaneous flow of the pump is equal to twice of that of a common plunger pump, the pulsation coefficient is reduced, and the pulsation rate is up to 1/4 of the common pump. The problems that the traditional hydraulic pump is large in instable instantaneous flow, the generated working pressure cannot meet the requirement of a machine and the working pressure is difficult to stabilize are solved, and noise caused by irregular vibration of all parts in the whole machine device is reduced and avoided. The hydraulic pump has application value in the research of hydraulic pump products and hydraulic transmission machines.

Referring to the attached figure 7, an instantaneous flow curve generated by the transmission plunger pump is a periodic trigonometric function curve, and because plungers on the left side and the right side of the single-swash-plate double-plunger staggered phase hydraulic pump simultaneously absorb oil and discharge oil, the instantaneous flow curve is equivalent to two trigonometric function curves with the same amplitude and the same period, and because the working angles of the plungers on the left side and the right side are different by half of the movement period of a single plunger, the geometric meaning of the instantaneous flow curve of the single-swash-plate staggered phase bidirectional plunger pump is a curve generated by staggering two identical trigonometric function curves by half of the period phase (namely, the wave crests and the wave troughs of the two periodic curves are mutually superposed). The amplitudes are mutually overlapped, and the amplitude variation is mutually overlapped and reduced.

Referring to fig. 8, a graph showing the simulation of the instantaneous flow of the single swash plate staggered phase bidirectional plunger pump is shown, a shows the curve of the instantaneous flow of the single swash plate staggered phase bidirectional plunger pump when the number of plungers is 6, b shows the dotted line of the instantaneous flow of the common pump when the number of plungers is 6, and it can be known from the graph that the flow of the single swash plate staggered phase bidirectional plunger pump is doubled and the flow pulsation is reduced to 1/4 of the common pump.

The above is a specific embodiment of the present invention, but the present invention is by no means limited thereto.

Claims (4)

1. The single-swash-plate phase-staggered bidirectional plunger pump is characterized by comprising a transmission shaft (14), a swash plate (5), a shell, a left plunger (7) and a right plunger (3); swash plate (5) are fixed through the spline on transmission shaft (14), m left side plunger (7) and n right side plunger (3) circumference equipartition is in on the left end face and the right-hand member face of swash plate (5), transmission shaft (14), swash plate (5), left plunger (7) and right plunger (3) wholly are located inside the casing, the diameter of the circumference that left side plunger (7) and right plunger (3) distribute is the same, m left side plunger (7) and n right plunger (3) installation angle differ half duty cycle, and the motor passes through transmission shaft (14) drive swash plate (5) rotate, and then drive left side plunger (7) and right plunger (3) work.

2. The single-swash-plate phase-staggered bidirectional plunger pump according to claim 1, further comprising a left oil outlet (9), a left oil inlet (10), a left oil inlet valve (8), a left clearance oil port (6), a right oil outlet (1), a right oil inlet (12), a right oil inlet valve (2, 13) and a right clearance oil port (4); the left oil outlet (9) and the right oil outlet (1) are respectively communicated with a left oil discharge cavity (16) and a right oil discharge cavity (21), and the left oil inlet (10) and the right oil inlet (12) are respectively communicated with a left oil suction cavity (17) and a right oil suction cavity (20); the left oil inlet valve (8) and the right oil inlet valve (2 and 13) are respectively connected with the left plunger (7) and the right plunger (3), and the upper part of the shell is provided with the left gap oil port (6) and the right gap oil port (4).

3. A single swash plate out of phase bi-directional plunger pump according to claim 1, wherein the number m of left plungers (7) is equal to the number n of right plungers (3), and the ranges of m and n are: m is more than or equal to 6, and n is more than or equal to 6.

4. The single-swash-plate phase-staggered bidirectional plunger pump according to claim 1, wherein the swash plate (5) is provided with a bearing hole (23) and a slipper hole (24), the bearing hole (23) of the swash plate (5) is connected with the housing through a bearing (11), and the left plunger (7) and the right plunger (3) are respectively matched with the slipper hole (24).