阅读说明：本技术 一种章动原理的高速往复泵驱动端 (High-speed reciprocating pump driving end based on nutation principle ) 是由 付家全 于 2020-04-25 设计创作，主要内容包括：本发明提供一种章动原理的高速往复泵驱动端,其特征在于,包括曲轴、斜盘、斜盘限位装置、圆锥滚子轴承一、圆锥滚子轴承二、轴承锁紧螺母、球头连杆组件、十字头、十字头缸体、曲轴加强管、曲轴加强管垫块和紧定螺钉,其中所述斜盘在所述曲轴的曲拐和所述斜盘限位装置的共同作用下,做章动运动,所述曲轴每旋转360度,所述斜盘完成一个摆动周期回到原位,所述十字头在所述十字头缸体的滑道内,随着所述斜盘的章动,做往复运动。根据本发明的章动原理的高速往复式驱动端,结构紧凑,流量脉动小,振动小,十字头侧向力小,油浴润滑时,搅油损失小,曲轴具有形状简单、加工制造要求低、承载力较高和装配容易的优点。(The invention provides a high-speed reciprocating pump driving end based on a nutation principle, which is characterized by comprising a crankshaft, a swash plate limiting device, a first tapered roller bearing, a second tapered roller bearing, a bearing locking nut, a ball head connecting rod assembly, a crosshead cylinder body, a crankshaft reinforcing pipe cushion block and a set screw, wherein the swash plate does nutation motion under the combined action of a crank throw of the crankshaft and the swash plate limiting device, the swash plate returns to the original position after completing a swing cycle every 360 degrees of rotation of the crankshaft, and the crosshead does reciprocating motion in a slide way of the crosshead cylinder body along with the nutation of the swash plate. The high-speed reciprocating type driving end based on the nutation principle has the advantages of compact structure, small flow pulsation, small vibration, small cross head lateral force, small oil stirring loss during oil bath lubrication, simple shape of a crankshaft, low processing and manufacturing requirements, high bearing capacity and easiness in assembly.)

1. The high-speed reciprocating pump driving end based on the nutation principle is characterized by comprising a crankshaft (1), a swash plate (2), a swash plate limiting device (4), a conical roller bearing I (5), a conical roller bearing II (6), a bearing locking nut (7), a ball head connecting rod assembly (8), a crosshead (9), a crosshead cylinder body (10), a crankshaft reinforcing pipe (12), a crankshaft reinforcing pipe cushion block (13) and a set screw (14), wherein the ball head connecting rod assembly (8) and the crosshead (9) have multiple groups and are circumferentially arranged along the central line of the crankshaft (1), an inner ring of the conical roller bearing I (5) is installed at one end, away from the central line of the crankshaft (1), of a crank throw of the crankshaft (1), an outer ring of the conical roller bearing I (5) and an outer ring of the conical roller bearing II (6) are fixed in the swash plate (2), the inner ring of the conical roller bearing II (6) is arranged at one end, close to the central line of the crankshaft (1), of the crank throw of the crankshaft (1) and is locked by the bearing locking nut (7), a process gap for installing the inner ring of the conical roller bearing II (6) is formed in the position, close to the central line of the crankshaft (1), of the crank throw (1), the crankshaft reinforcing pipe (12) is sleeved on the cylindrical surface of the crankshaft (1), the set screw (14) is arranged on the crankshaft reinforcing pipe (12) to tightly press the crankshaft reinforcing pipe cushion block (13) at the process gap of the crankshaft (1), the crank throw central line of the crankshaft (1) and the central line of the crankshaft (1) form a certain angle, two sides of the crankshaft (1) are supported by the bearings and rotate around the central line of the crankshaft (1), and the swash plate (2) is under the combined action of the crank throw of the crankshaft (1) and the swash plate limiting device (4), the swash plate (2) returns to the original position after completing one swing cycle every time the crankshaft (1) rotates 360 degrees, the ball head at one end of the ball head connecting rod component (8) is hinged on the swash plate (2), the ball head at the other end is hinged on the cross head (9), the crosshead (9) is arranged in a slideway of the crosshead cylinder body (10) and reciprocates along with the nutation of the swash plate (2), a plurality of ball head connecting rod assemblies (8) are arranged on the same plane at the center of a ball head on one side of the swash plate (2), the plane passes through the intersection point of the central line of the crankshaft (1) and the central line of the crank throw of the crankshaft (1), the shape of the outer side of the swash plate (2) is a spherical surface taking the intersection point of the crank throw central line of the crankshaft (1) and the central line of the crankshaft (1) as the center.

2. A nutating high speed reciprocating pump drive end according to claim 1, characterized in that the side of the swash plate stop (4) adjacent to the swash plate (2) has a conical gear, and the side of the swash plate (2) adjacent to the swash plate stop (4) has a conical gear, the teeth of the two conical gears being of the same number and meshing with each other.

Technical Field

The invention relates to the technical field of high-speed reciprocating pump driving ends, in particular to a high-speed reciprocating pump driving end based on a nutation principle.

Background

As described in chapter eleventh section of "reciprocating pump design", the high-speed reciprocating pump can be directly driven by a motor without a speed reducer, so that the structure of the pump is simplified, the volume is reduced, the weight is reduced, and the production cost is reduced; in addition, the high-speed multi-cylinder structure can also obviously reduce flow pulsation.

As described in chapter eleventh section of the design of reciprocating pumps, conventional high-speed reciprocating pumps, in which the plungers are arranged in a balanced or radial arrangement, are large, require a high-pressure pump to be very compact in some applications requiring the pump volume, such as an integrated reverse osmosis system, and are generally difficult to arrange in conventional high-speed reciprocating pumps.

Axial motors using nutation principles, such as US3171509, EP0453249a2, are very compact and use the reverse as a reciprocating pump drive end for high stroke times:

the connecting rod has small mass and is close to the central line of the crankshaft, and the inertia force is small;

the friction linear velocity of the connecting rod ball is low, and the heating is low;

the crosshead has small lateral force, small friction and low heat generation;

but the crank shaft has complex shape, more sliding bearings, high processing and manufacturing requirements and complex lubricating mechanism, and is not suitable for being applied to the driving end of the reciprocating pump.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a high-speed reciprocating pump driving end based on nutation principle, which has the advantages of compact structure, small flow pulsation, small vibration, small cross head lateral force, small oil stirring loss during oil bath lubrication, simple shape of a crankshaft, low processing and manufacturing requirements, higher bearing capacity and easy assembly.

In order to solve the technical problems, the invention provides a high-speed reciprocating pump driving end based on the nutation principle, which is characterized by comprising a crankshaft, a swash plate limiting device, a first conical roller bearing, a second conical roller bearing, a bearing locking nut, a ball head connecting rod assembly, a crosshead cylinder body, a crankshaft reinforcing pipe cushion block and a set screw, wherein the ball head connecting rod assembly and the crosshead are provided with a plurality of groups and are circumferentially arranged along the central line of the crankshaft, the inner ring of the first conical roller bearing is arranged at one end of the crankshaft crank throw away from the central line of the crankshaft, the outer ring of the first conical roller bearing and the outer ring of the second conical roller bearing are fixed in the swash plate, the inner ring of the second conical roller bearing is arranged at one end of the crankshaft crank throw close to the central line of the crankshaft and is locked by the bearing locking nut, the crankshaft is provided with a process notch used for installing two inner rings of the tapered roller bearing at the position of a crank throw close to the central line of the crankshaft, the crankshaft reinforcing pipe is sleeved on the cylindrical surface of the crankshaft, the set screw is arranged on the crankshaft reinforcing pipe to tightly press a crankshaft reinforcing pipe cushion block at the process notch of the crankshaft, the central line of the crankshaft crank throw and the central line of the crankshaft form a certain angle, two sides of the crankshaft are supported by the bearing and rotate around the central line of the crankshaft, the swash plate performs nutation motion under the combined action of the crank throw of the crankshaft and the swash plate limiting device, the swash plate returns to the original position after completing one swing cycle every 360 degrees of rotation of the crankshaft, the ball head at one end of the ball head connecting rod assembly is hinged on the swash plate, the ball head at the other end is hinged on the cross head, and the cross head is arranged in a slide way of the cross head cylinder body, the ball head connecting rod assemblies do reciprocating motion along with nutation of the swash plate, the centers of ball heads on one side of the swash plate are on the same plane, the plane is perpendicular to the crankshaft crank center line through the intersection point of the crankshaft center line and the crankshaft crank center line, and the shape of the outer side of the swash plate is a spherical surface taking the crankshaft crank center line and the crankshaft center line intersection point as the center.

Optionally, a bevel gear is arranged on one side, close to the swash plate, of the swash plate limiting device, a bevel gear is arranged on one side, close to the swash plate limiting device, of the swash plate, and the two bevel gears are identical in tooth number and meshed with each other.

Compared with the prior art, the invention has the following advantages:

the high-speed reciprocating pump driving end based on the nutation principle has the advantages of compact structure, small flow pulsation, small vibration, small cross head lateral force and small oil stirring loss during oil bath lubrication; through reasonable arrangement of the bearings, the process gap is formed, and reinforcing measures are added, so that the crankshaft has the advantages of simple shape, low processing and manufacturing requirements, high bearing capacity and easiness in assembly.

Drawings

The above and other features, properties and advantages of the present invention will become more apparent from the following description of the embodiments with reference to the accompanying drawings, in which:

FIG. 1 is a cross-sectional view of the drive end of a nutating high speed reciprocating pump in accordance with one embodiment of the present invention;

Detailed Description

The present invention is further described in the following description with reference to specific embodiments and the accompanying drawings, wherein the details are set forth in order to provide a thorough understanding of the present invention, but it is apparent that the present invention can be embodied in many other forms other than described herein, and it will be readily apparent to those skilled in the art that the invention is susceptible to considerable generalization and deduction without departing from the spirit of the invention and therefore the scope of the invention should not be limited by the contents of this specific embodiment.

FIG. 1 is a cross-sectional view of the drive end of a nutating high speed reciprocating pump in accordance with one embodiment of the present invention. As shown in fig. 1, the driving end of the high-speed reciprocating pump based on the nutation principle may include a crankshaft 1, a swash plate 2, a swash plate pulling plate 3, a swash plate limiting device 4, a tapered roller bearing 5, a tapered roller bearing 6, a bearing lock nut 7, a ball-end connecting rod assembly 8, a crosshead 9, a crosshead cylinder 10, a bearing spacer ring 11, a crankshaft reinforcing pipe 12, a crankshaft reinforcing pipe cushion block 13 and a set screw 14, wherein the number of the ball-end connecting rod assembly 8 and the crosshead 9 is multiple, and the number is usually selected between 7, 9 and 11, so that the pump flow pulsation of reciprocating plungers with the number of plungers is significantly reduced, and a pulsation damper may not be required, wherein the ball-end connecting rod assembly 8 and the crosshead 9 are arranged along the circumference of the center line of the crankshaft 1, and compared with the conventional side-by-side arrangement, the structure is compact. The inner ring of the tapered roller bearing I5 is arranged at one end, far away from the central line of the crankshaft 1, of the crank throw of the crankshaft 1, the outer ring of the tapered roller bearing I5 and the outer ring of the tapered roller bearing II 6 are pressed by the swash plate 2 and the swash plate pulling plate 3, the inner ring of the tapered roller bearing II 6 is arranged in the crank throw through the left side of the crankshaft 1 and is locked by the bearing locking nut 7, the central line of the crank throw of the crankshaft 1 and the central line of the crankshaft 1 form a certain angle, two sides of the crankshaft 1 are supported by the bearings and rotate around the central line of the crankshaft 1, the swash plate 2 performs nutation motion under the combined action of the crank throw of the crankshaft 1 and the swash plate limiting device 4, the swash plate 2 returns to the original position after completing one swing cycle every 360 degrees, the ball head at one end of the ball head connecting rod assembly 8 is hinged on the swash plate 2, the other end of the ball head is hinged on the crosshead 9, the crosshead 9 is arranged in a slideway of the crosshead cylinder body 10 and along with the nutation of the swash plate 2, and makes reciprocating motion. The ball head connecting rod assembly 8 driven by the nutation principle has the advantages that the motion track of the ball head on the swash plate 2 side is similar to a section of arc taking the intersection point of the central line of the crankshaft 1 and the central line of the crank throw of the crankshaft 1 as the center, the lateral force transmitted to the crosshead 9 is very small, the friction and the heat generation are small, and the crosshead 9 is suitable for high-speed motion. Meanwhile, the ball head connecting rod assembly 8 driven by the nutation principle has the advantages that the friction linear speed of the ball head is small, and the friction heating of the ball head is low. The crankshaft 1 is fixed by bearings on two sides, and compared with cantilever type fixing, the crankshaft has better rigidity and small deformation. The crankshaft of the axial engine adopts a plurality of sliding bearings, the manufacturing and processing requirements are high, and if the rolling bearings are adopted, the processing and manufacturing difficulty of the crankshaft can be greatly reduced. The swash plate 2 is complex in stress, comprises thrust transmitted by the ball-head connecting rod assembly 8, inertia force of the swash plate 2 which rapidly nutates and the like, and brings certain difficulty to selection and reasonable arrangement of a rolling bearing of the swash plate 2.

The crankshaft 1 is provided with a process gap used for installing the inner ring of the tapered roller bearing II 6 at the position of the crank throw close to the central line of the crankshaft 1. Because the atress of sloping cam plate 2 is great, when arranging tapered roller bearing 5 and tapered roller bearing two 6, hope that the bearing interval is great to better bear the moment of torsion of sloping cam plate 2, but the crank of bent axle 1 should be as short as possible, in order to reduce centrifugal force and rotatory linear velocity, open the technology breach on bent axle 1, can be in order to increase tapered roller bearing 5 and tapered roller bearing two 6's bearing interval, can avoid increasing the length of bent axle 1 crank again.

The crankshaft reinforcing pipe 12 is sleeved on the cylindrical surface of the crankshaft 1, and the set screw 14 is arranged on the crankshaft reinforcing pipe 12 to press the crankshaft reinforcing pipe cushion block 13 at the technological notch of the crankshaft 1. The crankshaft 1 can compensate rigidity reduction caused by arrangement of process notches through reinforcement, deformation of the crankshaft 1 under stress is reduced, and bearing capacity of the crankshaft 1 is increased.

The bearing spacing ring 11 is located between the outer ring of the first tapered roller bearing 5 and the outer ring of the second tapered roller bearing 6, so that the spacing distance between the first tapered roller bearing 5 and the second tapered roller bearing 6 can be conveniently adjusted.

The centers of the ball heads of the ball head connecting rod assemblies 8 on one side of the swash plate 2 are on the same plane, and the plane is perpendicular to the crank throw center line of the crankshaft 1 through the intersection point of the crankshaft 1 center line and the crank throw center line of the crankshaft 1. When the ball positions of the ball connecting rod assemblies 8 on one side of the swash plate 2 meet the requirement, under the condition that the distance between the centers of the two balls of the ball connecting rod assemblies 8 is not changed, the swing of the ball connecting rod assemblies 8 is minimum, and the lateral force of the cross head 9 is minimum.

The outer shape of the swash plate 2 is a spherical surface centered on the intersection of the crank center line of the crankshaft 1 and the center line of the crankshaft 1. Therefore, the outer surface of the swash plate 2 is always in the same spherical surface when nutating, so that the stirring of lubricating oil can be reduced, and the oil stirring loss is reduced.

The outer side shape of the swash plate pulling plate 3 is a spherical surface superposed with the outer side spherical surface of the swash plate 2, and the shape of a part of the crankshaft 1 close to the swash plate pulling plate 3 is a spherical surface superposed with the outer side spherical surface of the swash plate 2. Therefore, the outer side surface of the swash plate pulling plate 3 and a part of the crankshaft 1 close to the swash plate pulling plate 3 are always in the same spherical surface with the outer side surface of the swash plate 2 during movement, so that the stirring of lubricating oil can be reduced, and the oil stirring loss is reduced.

Sloping cam plate stop device 4 has conical gear near 2 one sides of sloping cam plate, and sloping cam plate 2 has conical gear near 4 one sides of sloping cam plate stop device, and these two conical gear tooth numbers are the same, and intermeshing can let every 360 degrees of rotation of bent axle 1, and the normal position is got back to a swing cycle to sloping cam plate 2 completion, does nutation motion, is that bearing capacity is higher, operates steadily's sloping cam plate stop device.

Compared with a crankshaft connecting rod reciprocating pump, the connecting rod assembly is small in mass, evenly distributed along the circumferential direction, short in distance from the central line of the crankshaft, and small in influence of the inertia force of the connecting rod on the vibration of the whole pump.

The crosshead of the reciprocating pump is driven by the nutation principle, the structure is compact, the flow pulsation is small, the vibration is small, the lateral force of the crosshead is small, and the crosshead can be suitable for running under high stroke times; meanwhile, the crankshaft has the advantages of simple shape, low processing and manufacturing requirements, higher bearing capacity and easiness in assembly; through special part shape and structural arrangement, when adopting oil bath lubrication, the oil stirring loss reduces.

Although the present invention has been disclosed in terms of the preferred embodiment, it is not intended to limit the invention, and variations and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. Therefore, any modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope defined by the claims of the present invention, unless the technical essence of the present invention departs from the content of the present invention.