CN203452989U - Single-swash-plate staggered phase bidirectional plunger pump - Google Patents

Abstract

The single swash plate out-of-phase two-way plunger pump belongs to the technical field of control hydraulic fluid mechanics, and aims to solve the problems of small flow rate, large pulsation and unstable operation in the prior art. The utility model includes a transmission shaft, a swash plate, a housing, a left plunger and a right plunger; the swash plate is fixed on the transmission shaft through splines, m left plungers and n right plungers are evenly distributed on the circumference of the swash plate On the left end face and the right end face, the transmission shaft, the swash plate, the left plunger and the right plunger are located inside the housing as a whole, and the diameters of the circles where the left plunger and the right plunger are distributed are the same, m left plungers and n right plungers The plug installation angles differ by half a working cycle, and the motor drives the swash plate to rotate through the transmission shaft, and then drives the left plunger and the right plunger to work. The utility model adopts the symmetrical structure of the left and right plungers of the single swash plate, which reduces the axial force of the plunger pump and improves the working accuracy. Flow pulsation is reduced by a factor of four.

Description

Single swash plate staggered two-way piston pump

technical field

The utility model belongs to the technical field of control hydraulic fluid mechanics, and in particular relates to a single swash plate out-of-phase bidirectional plunger pump.

Background technique

The hydraulic pump is an energy conversion component that converts the mechanical energy of the motor into the hydraulic energy of the fluid. It is the central link of the hydraulic transmission system and directly affects the performance of the entire machine and the stability of work. When the traditional hydraulic pump works normally, due to its large flow pulsation and unstable working pressure, it will have many adverse effects on the work of the machine, resulting in damage to the oil pipeline, causing damage to hydraulic components, loss of function or low working accuracy, It causes irregular vibration of various parts in the machine device and generates noise.

The Chinese patent with the publication number CN2247728 discloses a technical scheme of an invention titled double-swash plate double-connected axial piston pump. The upper and lower plunger pumps are installed on the upper and lower ends of the pump casing, the bimetal plate is installed in the pump casing, the swash plate is installed on the transmission shaft, and the transmission shaft is installed on the pump casing and the upper and lower columns. In the middle of the plunger pump, the upper and lower plunger pumps are connected by the same transmission shaft. The plunger pump is equivalent to installing two axial plunger pumps together to work at the same time. Although the instantaneous working flow of the product is increased and the working pressure is increased, the flow pulsation of the plunger pump has no substantial change.

Utility model content

The purpose of this utility model is to propose a single swash plate out-of-phase two-way plunger pump, which solves the problems of small flow, large pulsation, and unstable work in the prior art, and reduces and avoids the periodic failure of various components in the entire hydraulic system. Vibration, crawling, noise.

In order to achieve the above object, the single swash plate out-of-phase two-way plunger pump of the present invention includes a transmission shaft, a swash plate, a housing, a left plunger and a right plunger; the swash plate is fixed on the transmission shaft through a spline , the m left plungers and the n right plungers are evenly distributed on the left end surface and the right end surface of the swash plate, and the transmission shaft, the swash plate, the left plunger and the right plunger are integrally located on the Inside the casing, the diameters of the circles where the left and right plungers are distributed are the same, the installation angles of the m left plungers and the n right plungers differ by half a working cycle, and the motor drives the The swash plate rotates, and then drives the left plunger and the right plunger to work.

The plunger pump also includes a left oil outlet, a left oil inlet, a left oil inlet valve, a left gap oil port, a right oil outlet, a right oil inlet, a right oil inlet valve and a right gap oil port; The left oil outlet and the right oil outlet communicate with the left oil discharge chamber and the right oil discharge chamber respectively, and the left oil inlet and the right oil inlet communicate with the left oil suction chamber and the right oil suction chamber respectively; The left oil inlet valve and the right oil inlet valve are respectively connected with the left plunger and the right plunger, and the left gap oil port and the right gap oil port are opened on the upper part of the housing.

The number m of the left plunger is equal to the number n of the right plunger, and the value ranges of m and n are: m≥6, n≥6.

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

The beneficial effects of the utility model are: compared with the prior art, the single swash plate out-of-phase two-way plunger pump of the utility model improves the structure of the traditional plunger pump, uses a symmetrical structure of the left and right plungers of the single swash plate, and the two sides of the swash plate The plungers on the side are designed to be out of phase for half a cycle, and work at the same time. The instantaneous flow rate is doubled, and the flow pulsation is reduced to a quarter of the original. Due to the interaction of the reverse axial force, the axial force of the plunger pump is reduced. The single swash plate double plunger pump of the utility model realizes the joint work of the left and right twice to complete the oil suction and discharge. Compared with the traditional plunger pump, it is equivalent to doubling the plunger to realize reciprocation Movement increases the working volume and doubles the rated pressure, which solves the problem of low pressure in the traditional plunger pump; the single swash plate out-of-phase bidirectional plunger pump adopts the same inclination structure between the left and right plungers and the distribution plate, and the column The difference between the installation of the plug and the working angle at the same time is half a period, and the pulsation value obtained from the instantaneous flow curve of the plunger pump is reduced to 1/4 of that of the ordinary plunger pump, reducing and avoiding the periodic vibration of each component in the entire hydraulic system. Vibration improves working precision.

Description of drawings

Fig. 1 is the overall structural assembly diagram of the single swash plate out-of-phase 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 diagram of the pipeline connection of the plunger pump of the present invention;

Fig. 4 is the structural diagram of the swash plate in the plunger pump of the present invention;

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

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

Fig. 7 is a single plunger pump instantaneous flow curve;

Fig. 8 is a simulation curve diagram of the instantaneous flow rate of a bidirectional plunger pump with a single swash plate out of phase;

Among them: 1. Right oil outlet, 2. Right oil inlet valve, 3. Right plunger, 4. Right clearance oil port, 5. Swash plate, 6. Left clearance oil port, 7. Left plunger, 8. Left Oil inlet valve, 9, left oil outlet, 10, left oil inlet, 11, bearing, 12, right oil inlet, 13, right oil inlet valve, 14, transmission shaft, 15, total oil discharge cavity, 16, Left oil discharge chamber, 17, left oil suction chamber, 18, total oil suction chamber, 19, pipeline A, 20, right oil suction chamber, 21, right oil discharge chamber, 22, pipeline B, 23, bearing hole, 24, sliding Boot hole, 25, the left side plunger mouth, 26, the right side plunger mouth.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Referring to accompanying drawing 1, accompanying drawing 2, accompanying drawing 3, accompanying drawing 5 and accompanying drawing 6, the single swash plate out-of-phase two-way plunger pump of the present utility model comprises transmission shaft 14, swash plate 5, casing, left plunger 7 and the right plunger 3; the swash plate 5 is fixed on the transmission shaft 14 by splines, and the 6 left plungers 7 and the 6 right plungers 3 are evenly distributed on the circumference of the swash plate 5 On the left end face and the right end face, the transmission shaft 14, the swash plate 5, the left plunger 7 and the right plunger 3 are integrally located inside the housing, and the diameter of the circumference where the left plunger 7 and the right plunger 3 are distributed is Similarly, the installation angles of the m left plungers 7 and the n right plungers 3 differ by half a working cycle, and the motor drives the swash plate 5 to rotate through the transmission shaft 14, thereby driving the left plunger 7 and the right plunger 3 to rotate. Plunger 3 works.

The plunger pump also includes 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, and right oil inlet valves 2, 13 and the right clearance oil port 4; the left plunger 7 and the right plunger 3 communicate with the top through axial holes and radial holes, and the head cylindrical surfaces of the left plunger 7 and the right plunger 3 are cut There is a chute to change the circulating oil supply; the plunger sleeve is formed with inlet and outlet holes, which are all connected with the high and low pressure oil chambers in the pump body. The left oil outlet 9 mentioned in this article and the right oil outlet 1 communicates with the left oil discharge chamber 16 and the right oil discharge chamber 21 respectively.

The left oil inlet valve 8 and the right oil inlet valve 2, 13 are one-way valves. When the spring pressure is used, the conical surface on the upper part of the valve is in closed contact with the valve seat. The cavity at the upper end of the plunger is isolated to prevent the oil in the high-pressure oil pipe from flowing back into the fuel injection pump. The lower part of the oil inlet valve has a cross section, which can not only guide but also allow diesel oil to pass through. There is a small cylindrical surface under the conical surface of the oil outlet valve, which is called a decompression ring. Its function is to quickly reduce the oil pressure in the high-pressure oil pipe when the oil supply ends, so as to avoid oil dripping at the nozzle hole. When the ring belt falls into the valve seat, the upper volume increases rapidly, the pressure decreases rapidly, and the spraying stops rapidly. The left oil inlet valve 8 and the right oil inlet valve 2, 13 are respectively connected with the left plunger 7 and the right plunger 3, and the left gap oil port 6 and the right gap oil port 4 are opened on the upper part of the housing .

Referring to accompanying drawing 4, described swash plate 5 is provided with bearing hole 23 and shoe hole 24, and the bearing hole 23 of described swash plate 5 is connected with described housing through bearing 11, and described left plunger 7 and described The right plunger 3 cooperates with the shoe hole 24 respectively.

The overall structure of the single swash plate double plunger staggered phase hydraulic pump uses a swash plate 5 with double sides and equal inclination to complete the flow distribution work with the plungers. The left plunger 7 and the right plunger 3 on the left and right sides of the swash plate 5 reciprocate together, Complete their respective oil suction and oil discharge work. Therefore, when the single swash plate double plunger staggered phase hydraulic pump works normally, the pipeline connection is shown in Figure 3: the left oil suction chamber 17 and the right oil suction chamber 20 of the left plunger 7 and the right plunger 3 on the left and right sides of the swash plate 5 are used The pipeline A19 is connected to form the total oil suction chamber 18, the left oil discharge chamber 16 and the right oil discharge chamber 21 of the left plunger 7 and the right plunger 3 on the left and right sides of the swash plate 5 are connected with the pipeline B22 to form the total oil discharge chamber 15, and The difference between the working angle of the right plunger port 26 and that of the left plunger port 25 is half of the plunger movement cycle, so as to ensure the superposition of the flow curves on both sides at peaks and troughs and reduce flow pulsation.

The motor drives the transmission shaft 14 to drive the double-sided equi-inclination swash plate 5 to rotate, and the plungers on the left and right sides reciprocate at the same time to realize oil suction and oil discharge. Where z represents the number of plungers.

The swash plate 5 adopts an equi-inclination symmetrical structure, and the purpose is to make the flow distribution conditions of the working plungers on the left and right sides the same, so as to make the working environment the same.

The working principle of the single swash plate out-of-phase two-way plunger pump is as follows: the motor drives the transmission shaft 14 to drive the swash plate 5 to perform a circular motion, and the left and right plungers 3 in contact with it perform a reciprocating linear motion at the same time. When the first plunger performs a compression motion , the volume becomes smaller and the pressure increases, and the oil is discharged through the right oil outlet and the left oil outlet 9, realizing the oil discharge process. When the first plunger is stretched, the volume becomes larger and the pressure becomes smaller, and the oil is sucked through the right oil inlet 12 and the left oil inlet 10 to realize the oil absorption process. The left plunger 7 is a plunger distributed on the top of the left circumference of the swash plate 5, and the right plunger 3 is a plunger distributed on the top of the right circumference of the swash plate 5. The installation angles of the plungers on both sides differ by half a working cycle, but Work at the same time to ensure the superposition of the flow curve.

The principle of increasing the working pressure and reducing the flow pulsation of the single swash plate staggered two-way plunger pump: 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 It is superimposed on two periodic trigonometric function curves, so when the two plungers are combined, the working phase angles of the two plungers are staggered by half a cycle angle, and its geometric meaning is that two trigonometric function curves of the same waveform are staggered by half a cycle angle. The phase is superimposed, the amplitude is doubled, and the amplitude change is reduced by a quarter.

Assume that the pressure, flow and instantaneous flow produced by the left plunger 7 and the right plunger 3 are respectively p ₁ , p ₂ , Q ₁ , Q ₂ , (Q _sh ) ₁ , (Q _sh ) ₂ , then the single swash plate is out of phase The pressure, flow and instantaneous flow of the two-way plunger pump are p, Q, ∑(Q _sh ), then there is formula (1):

$\left\{\begin{array}{c}{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="p"\; filenames="HDA00003629415500012.png"\; state="\{\{state\}\}">p</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; p</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ {\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="Q"\; filenames="HDA00003629415500012.png"\; state="\{\{state\}\}">Q</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ \mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="1"\; label="Q"\; filenames="HDA00003629415500012.png"\; state="\{\{state\}\}">Q</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="Q"\; filenames="HDA00003629415500011.png"\; state="\{\{state\}\}">Q</figure-callout></span>}}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\\ \mathrm{<span\; class="notranslate">\; \&Sigma;</span>}<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; sh</span>}}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; sh</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; sh</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}\end{array}\right.<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

由于

表示单个柱塞的工作周期，因此左右柱塞3的工作相位角相差半个周期，则

为右柱塞3相对于左柱塞7滞后的工作角度。When the plungers on the left and right sides are even numbers: the rotation angles of the left plunger 7 and the right plunger 3 are respectively

because

Represents the working cycle of a single plunger, so the working phase angle of the left and right plungers 3 differs by half a cycle, then

is the lagging working angle of the right plunger 3 relative to the left plunger 7.

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

落后

于角，以便实现

则

应满足公式（4）所示的工作角度：in, is the performance parameter of the product, because

behind

At angle to achieve

but

The working angle shown in formula (4) should be satisfied:

∑(Q sh ) _max and ∑(Q _sh ) _min shown in formula (5) and formula (6) are deduced by mathematical formula (1), formula (2), formula (3) and formula ( ₄ ):

$\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; sh</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="k"\; filenames="HDA00003629415500011.png"\; state="\{\{state\}\}">k</figure-callout></span>}\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; cos</span>}\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; z</span>}}}{\mathrm{<span\; class="notranslate">\; sin</span>}\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; z</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 5</span>}<span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; sh</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; min</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; <figure-callout\; id="2"\; label="k"\; filenames="HDA00003629415500011.png"\; state="\{\{state\}\}">k</figure-callout></span>}\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; cos</span>}\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; z</span>}}\mathrm{<span\; class="notranslate">\; cos</span>}\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; z</span>}}}{\mathrm{<span\; class="notranslate">\; sin</span>}\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; z</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 6</span>}<span\; class="notranslate">\; )</span>$

Formula (7) is the flow instability coefficient:

$\mathrm{<span\; class="notranslate">\; \&delta;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; max</span>}}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&Sigma;</span>}{<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; Q</span>}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; min</span>}}}{{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; +</span>{<span\; class="notranslate">\; (</span>{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}<span\; class="notranslate">\; )</span>}_{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; k</span>}\mathrm{<span\; class="notranslate">\; the\; tan</span>}\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; z</span>}}}{\mathrm{<span\; class="notranslate">\; 2</span>}{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; t</span>}}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; z</span>}}\mathrm{<span\; class="notranslate">\; the\; tan</span>}\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; z</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 7</span>}<span\; class="notranslate">\; )</span>$

Among them, Q _t represents the average flow rate of the plunger pump, k is the product performance parameter, Q is the instantaneous flow rate of the plunger pump, and z is the number of plungers installed in the plunger pump with the single swash plate out of phase.

The flow pulsation coefficient of the single swash plate misphased bidirectional plunger pump is compared with the flow pulsation coefficient of the ordinary plunger pump to get the formula (8):

因此单斜盘错相位双向柱塞泵的流量脉动系数最大为普通柱塞泵的流量脉动的四分之一。Among them: z represents the number of plungers installed in the plunger pump with a single swash plate out of phase. Since z≥1, there is a maximum value on the right side of the equation:

Therefore, the flow pulsation coefficient of the single swash plate out-of-phase two-way plunger pump is at most a quarter of the flow pulsation of the ordinary plunger pump.

Similarly, when the number of plungers in the single swash plate out-of-phase two-way plunger pump is odd, the derivation process of the flow pulsation is the same. Conclusion: The flow pulsation coefficient of the single swash plate misphased two-way plunger pump is compared with the flow pulsation coefficient of the ordinary plunger pump, and the formula (9) is obtained:

因此单斜盘错相位双向柱塞泵的流量脉动系数最大为普通柱塞泵的流量脉动的四分之一。In the formula, z represents the number of plungers installed in the single swash plate out-of-phase two-way plunger pump. Since z≥1, there is a maximum value on the right side of the equation as

Therefore, the flow pulsation coefficient of the single swash plate out-of-phase two-way plunger pump is at most a quarter of the flow pulsation of the ordinary plunger pump.

The single swash plate double plunger staggered phase axial plunger pump proposed in this paper, after theoretical analysis and actual calculation, the instantaneous flow rate of the pump is twice that of the ordinary plunger pump, and the pulsation coefficient is reduced, and the pulsation rate is the largest. 1/4 of the pump. It solves the problems of the large instantaneous flow instability of the traditional hydraulic pump, the generated working pressure cannot meet the needs of the machine, and the problem that the working pressure is difficult to stabilize, and reduces and avoids the noise caused by the irregular vibration of various components in the entire machine device. . Research on hydraulic pump products and hydraulic transmission machines has application value.

See Figure 7, the instantaneous flow curve generated by the transmission plunger pump is a periodic trigonometric function curve. Since the plungers on the left and right sides of the single swash plate and double plunger out-of-phase hydraulic pump perform oil suction and discharge work at the same time, the instantaneous flow curve It is equivalent to the superposition of two trigonometric function curves with the same amplitude and the same period, and because the working angle of the plungers on the left and right sides differs by half of the movement cycle of a single plunger, the geometry of the instantaneous flow curve of the single swash plate misphase bidirectional plunger pump It means that two identical trigonometric function curves are staggered by half a cycle phase (that is, the peaks and troughs of two periodic curves are superimposed on each other). The amplitudes are superimposed on each other, and the amplitude changes are superimposed and subtracted from each other.

Referring to accompanying drawing 8, it shows the instantaneous flow simulation curve of the single swash plate misphase bidirectional plunger pump, a represents the instantaneous flow curve of the single swash plate misphase bidirectional plunger pump when the number of plungers is 6, b represents the number of plungers The dotted line of the instantaneous flow rate of the ordinary pump at 6 o'clock, it can be seen from the figure that the flow rate of the single swash plate out-of-phase bidirectional plunger pump is doubled, and the flow pulsation is reduced to 1/4 of the ordinary pump.

The above are specific embodiments of the present utility model, but are by no means limiting the present utility model.

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 plunger (7) with n right plunger (3) circumference equipartition is in on the left end face and the right end 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 plunger (7) and n right plunger (3) installation angle differ half duty cycle, and the motor passes through transmission shaft (14) drives 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).

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