阅读说明：本技术 一种高速高压轴向柱塞泵 (High-speed high-pressure axial plunger pump ) 是由 叶绍干 施嘉佳 侯亮 卜祥建 于 2019-11-28 设计创作，主要内容包括：一种高速高压轴向柱塞泵,涉及柱塞泵。由旋转组件、端盖、泵体组成；所述旋转组件包括平衡式主轴、耐磨轴承、斜盘、柱塞、柱塞压板、吸油逻辑阀,柱塞套、柱塞套支架、中心顶杆、预紧簧和出油逻辑阀；所述端盖包括轴承压板、卡簧、圆柱滚子轴承、圆锥滚子轴承和端盖体；所述泵体包括泵壳和限位器。通过平衡式主轴与斜盘沿各自中心轴线的旋转运动带动柱塞往复运动,将柱塞泵工作时的主要摩擦副转换为柱塞在柱塞套内的往复摩擦、柱塞球头及中心顶杆在斜盘内的转动球副、斜盘及平衡式主轴的轴承转动副,大大减少了柱塞泵内的高速摩擦副,具有结构简单,高速高压工况下可靠性高的特点,生产成本低,有利于大规模生产与使用。(A high-speed high-pressure axial plunger pump relates to a plunger pump. Consists of a rotating component, an end cover and a pump body; the rotating assembly comprises a balanced type main shaft, a wear-resistant bearing, a swash plate, a plunger pressing plate, an oil absorption logic valve, a plunger sleeve bracket, a central ejector rod, a pre-tightening spring and an oil outlet logic valve; the end cover comprises a bearing pressing plate, a clamp spring, a cylindrical roller bearing, a tapered roller bearing and an end cover body; the pump body includes pump case and stopper. The plunger reciprocating motion is driven by the rotating motion of the balanced type main shaft and the swash plate along the central axis of the balanced type main shaft and the swash plate, the main friction pair during the operation of the plunger pump is converted into the reciprocating friction of the plunger in the plunger sleeve, the rotating ball pair of the plunger ball head and the central ejector rod in the swash plate, the swash plate and the bearing rotating pair of the balanced type main shaft, the high-speed friction pair in the plunger pump is greatly reduced, and the plunger reciprocating friction pair has the characteristics of simple structure and high reliability under the high-speed and high-pressure working condition, is low in production cost.)

1. A high-speed high-pressure axial plunger pump is characterized by comprising a rotating assembly, an end cover and a pump body; the rotating assembly comprises a balanced type main shaft, a wear-resistant bearing, a swash plate, a plunger pressing plate, an oil absorption logic valve, a plunger sleeve bracket, a central ejector rod, a pre-tightening spring and an oil outlet logic valve; the end cover comprises a bearing pressing plate, a clamp spring, a cylindrical roller bearing, a tapered roller bearing and an end cover body; the pump body comprises a pump shell and a limiter;

the rotating assembly is arranged in the pump body and the end cover, the pump shell is connected with the end cover, the tapered roller bearing and the cylindrical roller bearing are sequentially sleeved on the right shaft of the balanced type spindle from left to right, and the bearing pressure plate is sleeved on the right shaft of the balanced type spindle from left to right; the clamp spring is arranged on the right side of the bearing pressing plate and in the hole groove of the end cover body and is used for preventing the axial movement of the bearing and the pressing plate; a v-shaped disc integrally formed with the balanced spindle is arranged on the left side of the balanced spindle, one side of the v-shaped disc is perpendicular to the balanced spindle, the other side of the v-shaped disc and the balanced spindle have a certain inclination angle, a through hole is formed in one side of the inclination angle, and the inclination angle is connected with the balanced spindle through the through hole; the wear-resistant bearing is arranged in the through hole of the balanced driving shaft and is used for bearing the friction between the swash plate and the balanced driving shaft; the right side of the central ejector rod is in spherical hinge with the central position of the left side of the swash plate, and the left side of the central ejector rod is provided with a pre-tightening spring for providing pre-tightening force before receiving working load; the number of the plungers is 2, and the plungers are respectively positioned on two sides of the central ejector rod; two ends of the left side of the swash plate are respectively provided with 2 plunger pressing plates, the right side of the plunger is in spherical hinge joint with the left side of the swash plate, and force sealing is realized through the plunger pressing plates; the oil absorption logic valve is arranged in the plunger, and the upper end and the lower end of the oil absorption logic valve 1-6 are communicated with the interior of the pump shell; the plunger is sleeved on the plunger bracket; the left end of the pump shell is provided with an oil outlet, and the oil outlet logic valve is arranged at the central axis position of the oil outlet; the limiting device is provided with a limiting groove and is arranged on the pump shell and used for limiting the swash plate to do eccentric swinging motion within a certain angle and position range.

2. A high speed, high pressure axial plunger pump as recited in claim 1, wherein said plunger left side is rounded to ensure radial oscillation within said plunger sleeve over a range of angles.

3. A high speed, high pressure axial plunger pump as recited in claim 1, wherein said plunger sleeve is formed of a material having good wear resistance.

4. A high speed, high pressure axial plunger pump as in claim 3, wherein said wear resistant material is a wear resistant alloy.

5. A high speed, high pressure axial plunger pump as recited in claim 1, wherein said plunger sleeve is mounted on said plunger support and is fixedly attached to said plunger sleeve support by a bolt assembly.

6. A high speed, high pressure axial plunger pump as in claim 1 wherein the pump casing and end cap are connected by a bolt assembly.

7. The high-speed high-pressure axial plunger pump according to claim 1, wherein oil seals are disposed at the end cap and the pump body, at the bearing and bearing pressure plate, and at the joint of the bearing pressure plate and the balanced spindle.

Technical Field

The invention relates to a plunger pump, in particular to a high-speed high-pressure axial plunger pump with a fixed long-life valve flow distribution cylinder body.

Background

The axial plunger pump is used as a core power element of a hydraulic system, has the advantages of small volume, large power-weight ratio, multiple variable modes and the like, and is widely applied to occasions with high pressure, large flow and the need of flow regulation, such as engineering machinery, ships and the like.

The traditional swash plate type plunger pump is complex in structure, friction pairs with high linear speed are formed between a swash plate and a sliding shoe, between a valve plate and a cylinder body, between a plunger and the cylinder body, and when the cleanliness of oil is poor, the friction pairs are easy to damage, so that the service life of the plunger pump is limited while great obstacle is caused to the adaptability of the plunger pump.

The existing solutions are as follows: the material with good wear resistance, the reasonable design of the plunger piston structure and the optimization of related design parameters are adopted to improve the stress condition between the friction pairs and reduce the occurrence of related faults. However, these optimization methods still do not make the axial plunger pump fully adapt to the working conditions of high speed and high pressure.

Chinese patent CN201210126844.1 discloses a balanced type high flow axial plunger pump, which includes: the device comprises a swash plate, a cylinder body, a plunger, a valve plate, a shell and a transmission shaft; a plurality of rows of plunger holes distributed in concentric circles are arranged in the cylinder body; the valve plate is provided with a plurality of rows of oil suction and discharge ports; the shell is used for connecting a plurality of oil discharge ports of the valve plate into an oil outlet and connecting a plurality of oil suction ports of the valve plate into an oil inlet. The swash plate comprises a plurality of step type inclined planes which are arranged in layers, and the inclination angles of two adjacent inclined planes in layers are arranged in opposite directions; the inclined planes on each layer are provided with plungers connected with the inclined planes through sliding shoes, and the plungers on the same layer of inclined planes correspond to the plunger holes which are matched with the plungers in the cylinder bodies and are positioned on the same row of concentric circles.

Chinese patent CN201210230994.7 discloses a high-pressure high-speed valve flow distribution axial plunger pump, which comprises a housing, wherein a shaft, a bearing, a moving ring, a spring, a sliding shoe, a chuck, a plunger, an oil cylinder, an oil outlet one-way valve and an oil inlet one-way valve are arranged in the housing; a static ring, a dynamic ring and a spring are sequentially sleeved between the shaft and the shell from left to right; bearings are respectively arranged on two sides of the shaft; the rightmost end of the shaft is an inclined plane, the middle part of the end is provided with a bulge, and the sliding shoe is positioned at the bottom of the inclined plane; a chuck is fixed on the protrusion of the shaft, and the chuck fixes the sliding shoe between the chuck and the bottom of the inclined plane; the oil cylinder is embedded in the right end of the shell, and the right end part of the oil cylinder is inserted in the rear seat; the upper part of the oil cylinder is provided with a plunger hole provided with a plunger and an oil outlet one-way valve, the lower part of the oil cylinder is provided with an oil inlet hole provided with an oil inlet one-way valve, and the right end part of the middle part of the oil cylinder is provided with an oil outlet hole.

Disclosure of Invention

The invention aims to reduce high-speed friction pairs in part of the traditional axial plunger pump and provide a high-speed high-pressure axial plunger pump with a fixed long-life valve distributing cylinder body, which can ensure that the application of the plunger pump in mechanical equipment with micro, compactness and larger speed regulation range is not limited any more.

The invention is composed of a rotating component, an end cover and a pump body; the rotating assembly comprises a balanced type main shaft, a wear-resistant bearing, a swash plate, a plunger pressing plate, an oil absorption logic valve, a plunger sleeve bracket, a central ejector rod, a pre-tightening spring and an oil outlet logic valve; the end cover comprises a bearing pressing plate, a clamp spring, a cylindrical roller bearing, a tapered roller bearing and an end cover body; the pump body comprises a pump shell and a limiter;

the rotating assembly is arranged in the pump body and the end cover, the pump shell is connected with the end cover, the tapered roller bearing and the cylindrical roller bearing are sequentially sleeved on the right shaft of the balanced type spindle from left to right, and the bearing pressure plate is sleeved on the right shaft of the balanced type spindle from left to right; the clamp spring is arranged on the right side of the bearing pressing plate and in the hole groove of the end cover body and is used for preventing the axial movement of the bearing and the pressing plate; a v-shaped disc integrally formed with the balanced spindle is arranged on the left side of the balanced spindle, one side of the v-shaped disc is perpendicular to the balanced spindle, the other side of the v-shaped disc and the balanced spindle have a certain inclination angle, a through hole is formed in one side of the inclination angle, and the inclination angle is connected with the balanced spindle through the through hole; the wear-resistant bearing is arranged in the through hole of the balanced driving shaft and is used for bearing the friction between the swash plate and the balanced driving shaft; the right side of the central ejector rod is in spherical hinge with the central position of the left side of the swash plate, and the left side of the central ejector rod is provided with a pre-tightening spring for providing pre-tightening force before receiving working load; the number of the plungers is 2, and the plungers are respectively positioned on two sides of the central ejector rod; two ends of the left side of the swash plate are respectively provided with 2 plunger pressing plates, the right side of the plunger is in spherical hinge joint with the left side of the swash plate, and force sealing is realized through the plunger pressing plates; the oil absorption logic valve is arranged in the plunger, and the upper end and the lower end of the oil absorption logic valve 1-6 are communicated with the interior of the pump shell; the plunger is sleeved on the plunger bracket; the left end of the pump shell is provided with an oil outlet, and the oil outlet logic valve is arranged at the central axis position of the oil outlet; the limiting device is provided with a limiting groove and is arranged on the pump shell and used for limiting the swash plate to do eccentric swinging motion within a certain angle and position range.

The left side of the plunger piston can be in a circular arc shape and is used for ensuring that the plunger piston radially swings in the plunger piston sleeve within a certain angle range of X degrees.

The plunger sleeve can be made of materials with good wear resistance, such as wear-resistant alloy.

The plunger is sleeved on the plunger support and can be fixedly connected to the plunger support through a bolt assembly.

The pump casing and the end cover can be connected through a bolt assembly.

And oil seals can be arranged at the positions of the end cover and the pump body, the bearing and the bearing pressure plate and the joint of the bearing pressure plate and the balanced spindle for sealing.

The working principle of the invention is given below:

when the device works, the balanced type main shaft is driven by the prime motor to rotate around the axis of the balanced type main shaft, and the swash plate is driven by the connecting through hole on the shaft to eccentrically rotate and swing around the central axis of the swash plate. The right end of the plunger piston is spherical and is pressed on the swash plate through the plunger piston pressing plate. The left end of the plunger is arranged in the plunger sleeve hole. The axis of the main shaft and the central axis of the swash plate form a fixed angle, and when the main shaft rotates, the swash plate generates axial displacement along the balanced main shaft to drive the plunger piston to reciprocate in the plunger sleeve hole. When the plunger enters the plunger trepanning, oil in the plunger trepanning is compressed, the one-way valve connected with the plunger trepanning is opened, and the oil in the plunger trepanning is output outwards. When the plunger piston exits from the plunger piston sleeve hole, the inner cavity of the plunger piston sleeve hole is enlarged, and oil liquid in the shell flows into the plunger piston sleeve hole. The right balancing device on the balanced main shaft is provided with a tapered roller bearing for offsetting the axial acting force acting on the balanced main shaft when the swash plate eccentrically swings, and the generated radial acting force is offset by the cylindrical roller bearing and the tapered roller bearing together.

Compared with the prior art, the invention has the following beneficial effects:

different from the traditional axial plunger pump, the balanced type main shaft in the rotating assembly rotates around the axis of the balanced type main shaft to drive the swash plate to rotate around the central axis of the swash plate, so that the plunger reciprocates along the axis, and oil is sucked and pressed by matching with an oil suction logic valve and an oil outlet logic valve to form stable flow input and output. The balance device of the balance type main shaft can offset the eccentric force when the swash plate rotates. The limiting stopper is arranged on the pump shell and used for limiting the swash plate to do eccentric swinging motion within a certain angle and position range. The left side of the inner plunger of the rotating assembly is arc-shaped, so that the inner plunger meets a swash plate and radially swings within a certain angle range. The plunger reciprocating motion is driven by the rotating motion of the balanced type main shaft and the swash plate along the central axis of the balanced type main shaft and the swash plate, the main friction pair during the operation of the plunger pump is converted into the reciprocating friction of the plunger in the plunger sleeve, the rotating ball pair of the plunger ball head and the central ejector rod in the swash plate, the swash plate and the bearing rotating pair of the balanced type main shaft, the high-speed friction pair in the plunger pump is greatly reduced, and the plunger reciprocating friction pair has the characteristics of simple structure and high reliability under the high-speed and high-pressure working condition and is more. Meanwhile, the invention fully considers the production and processing conditions of the plunger type oil pump and common friction pair materials, guarantees the production cost and is beneficial to large-scale production and use.

Drawings

FIG. 1 is a cross-sectional view of an embodiment of the present invention.

Fig. 2 is a working principle diagram of the oil suction logic valve according to the embodiment of the invention.

Detailed Description

The invention will be further illustrated and described in the following examples in conjunction with the drawings.

As shown in fig. 1 and 2, the embodiment of the invention is composed of a rotating assembly, an end cover and a pump body. The rotating assembly comprises a balanced type main shaft 1-1, a wear-resistant bearing 1-2, a swash plate 1-3, a plunger 1-4, a plunger pressure plate 1-5, an oil absorption logic valve 1-6, a plunger sleeve 1-7, a plunger sleeve support 1-8, a central ejector rod 1-9, a pre-tightening spring 1-10 and an oil outlet logic valve 1-11; the end cover comprises a bearing pressing plate 2-1, a clamp spring 2-2, an oil seal 2-3/2-8, a cylindrical roller bearing 2-4, a tapered roller bearing 2-5 and an end cover body 2-6; the pump body comprises a pump shell 3-1 and a limiter 3-2.

The pump body 3-1 is connected with the end cover through a bolt assembly, and an oil seal 2-3 is arranged at the joint of the left end of the end cover 3-2 to prevent liquid in the shell from leaking. The rotating assembly is arranged inside the pump body 3-1 and the end cover 2.

A tapered roller bearing 2-5, a cylindrical roller bearing 2-4, a bearing pressure plate 2-1 and the tapered roller bearing 2-5 are sequentially sleeved on the right shaft of the balanced type main shaft 1-1 from left to right, the tapered roller bearing 2-5 is used for offsetting an axial acting force acting on the balanced type main shaft 1-1 when the swash plate 1-3 eccentrically swings, and a generated radial acting force is offset by the cylindrical roller bearing 2-4 and the tapered roller bearing 2-5 together. A v-shaped disc integrally formed with the balanced main shaft 1-1 is arranged on the left side of the balanced main shaft 1-1, one side of the v-shaped disc is perpendicular to the balanced main shaft 1-1, and a certain inclination angle is reserved between the one side of the v-shaped disc and the balanced main shaft; one side of the inclination angle is provided with a through hole, and the swash plate 1-3 is connected with the balanced type main shaft 1-1 through the through hole.

A central ejector rod 1-9 which is in spherical hinge connection with the swash plate 1-3 is arranged at the center of the left side of the swash plate 1-3; the left side of the central mandril 1-9 is provided with a pre-tightening spring 1-10 to provide pre-tightening force before receiving working load. The left side of the swash plate 1-3 is connected with the plunger 1-4 in a hinged mode, and force sealing is achieved through the plunger pressing plate 1-5.

The oil suction logic valve 1-6 is arranged inside the plunger 1-4, and the upper end and the lower end of the oil suction logic valve 1-6 are communicated with the inside of the pump shell.

The plunger sleeve 1-7 is fixedly connected to the plunger sleeve support 1-8 through a bolt assembly.

The left end of the pump shell 3-1 is provided with an oil outlet, and the central axis position of the pump shell is provided with an oil outlet logic valve 1-11.

The clamp spring 2-2 is arranged on the right side of the bearing pressing plate 2-1 and in a hole groove of the end cover body 2-6, and axial movement of the bearing and the pressing plate is prevented.

The wear-resistant bearing 1-2 is arranged in a through hole of the balanced type driving shaft 1-1 and used for bearing friction between the swash plate 1-3 and the balanced type driving shaft 1-1.

The limiting device 3-2 is provided with a certain limiting groove, and the limiting device 3-2 is installed on the pump shell 3-1 and used for limiting the swash plate to do eccentric swinging motion within a certain angle and position range.

The left sides of the plungers 1-4 are arc-shaped, so that the plungers can radially swing within a certain angle range of X degrees in the plunger sleeve.

The plunger sleeve 1-7 is made of materials with good wear resistance, such as wear-resistant alloy.

The pump shell 3-1 is connected with the end cover 2 through a bolt assembly, and an oil seal 2-8 is arranged at the joint and used for preventing liquid in the shell from leaking.

2 plungers 1-4 are respectively arranged at two sides of the central ejector rod 1-9; two ends of the left side of the swash plate 1-3 are respectively provided with 2 plunger pressing plates 1-5.

And a certain oil seal is arranged in the end cover, and the oil seal is arranged at the positions of the end cover and the pump body, the bearing and the bearing pressure plate and the joint of the bearing pressure plate and the balanced spindle.

When the plunger type plunger pump works, the balanced type main shaft 1-1 is driven to rotate by a prime motor, the swash plate 1-3 is driven to eccentrically rotate and swing through the connecting through hole on the shaft, so that the swash plate 1-3 generates axial displacement along the balanced type main shaft, and the plunger 1-4 is driven to reciprocate in the plunger sleeve 1-1. When the plungers 1 to 3 enter the plunger holes, oil in the plunger holes is compressed, the one-way valves connected with the plunger holes are opened, and the oil in the plunger holes is output outwards. When the plunger piston exits the plunger piston hole, the cavity in the plunger piston hole is enlarged, and oil liquid in the shell flows into the plunger piston hole.

In summary, the long-life valve flow distribution cylinder fixed high-speed high-pressure axial plunger pump provided by the invention changes the swash plate-rotating cylinder structure in the traditional plunger pump into the cylinder fixed structure in which the swash plate is driven by the balanced spindle to eccentrically swing, so that the friction pair with high linear speed is greatly reduced, the plunger pump is more suitable for high-speed and high-pressure working conditions, and the service life of the plunger pump is prolonged.

The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, which is defined by the appended claims.