阅读说明：本技术 一种用于高压柱塞变量泵的配油盘偏磨消除方法 (Eccentric wear eliminating method for oil distribution disc of high-pressure plunger variable pump ) 是由 王晋芝 安维亮 李东实 于 2021-08-23 设计创作，主要内容包括：本发明公开了一种用于高压柱塞变量泵的配油盘偏磨消除方法,包括以下步骤：a、建立三维空间坐标系；b、通过仿真建立缸体与配油盘的球面之间的油膜压力分布云图,c、基于三维空间坐标系和油膜压力分布云图,仿真计算得到配油盘在X轴、Y轴、Z轴三个方向上的偏侧力以及围绕X轴、Y轴、Z轴的三个偏转力矩,d、在配油盘的进油孔和出油孔之间设置油道、在配油盘靠近进油孔的端面上设置与油道连接的第一油口、在配油盘靠近进油孔的弧面上设置第二油口,减少或消除配油盘的偏转力矩和偏侧力。本发明具有能防止配油盘偏磨的优点,可提高变量泵的使用寿命。(The invention discloses a method for eliminating eccentric wear of an oil distribution disc of a high-pressure plunger variable pump, which comprises the following steps of: a. establishing a three-dimensional space coordinate system; b. the method comprises the steps of establishing an oil film pressure distribution cloud picture between a cylinder body and a spherical surface of an oil distribution disc through simulation, c, obtaining offset force of the oil distribution disc in three directions of an X axis, a Y axis and a Z axis and three deflection moments around the X axis, the Y axis and the Z axis through simulation calculation based on a three-dimensional space coordinate system and the oil film pressure distribution cloud picture, d, arranging an oil duct between an oil inlet hole and an oil outlet hole of the oil distribution disc, arranging a first oil port connected with the oil duct on the end face, close to the oil inlet hole, of the oil distribution disc, arranging a second oil port on an arc face, close to the oil inlet hole, of the oil distribution disc, and reducing or eliminating the deflection moment and the offset force of the oil distribution disc. The invention has the advantage of preventing the eccentric wear of the oil distribution disc and can prolong the service life of the variable pump.)

1. An eccentric wear eliminating method for an oil distribution disc of a high-pressure plunger variable displacement pump is characterized by comprising the following steps: the method comprises the following steps:

a. establishing a three-dimensional space coordinate system, wherein the origin of the three-dimensional space coordinate system is the intersection point of the axis of the slideway (16) and the axis of the cylinder body, the X axis of the three-dimensional space coordinate system is parallel to the axis of the slideway (16), and the Z axis of the three-dimensional space coordinate system is vertical to the end surface of the regulator;

b. an oil film pressure distribution cloud picture between a cylinder body and a spherical surface (11) of an oil distribution disc (10) is established through simulation,

c. based on a three-dimensional space coordinate system and an oil film pressure distribution cloud picture, the offset force of the oil distribution disc (10) in the X-axis direction, the Y-axis direction and the Z-axis direction and three offset moments around the X-axis direction, the Y-axis direction and the Z-axis direction are obtained through simulation calculation,

d. an oil duct (21) is arranged between an oil inlet (13) and an oil outlet (14) of an oil distribution disc (10), a first oil port (17) connected with the oil duct (21) is arranged on the end face, close to the oil inlet (13), of the oil distribution disc (10), a second oil port (19) is arranged on the arc face (12), close to the oil inlet (13), of the oil distribution disc (10), so that part of high-pressure oil of the oil outlet (14) enters between the arc face (12), close to the oil inlet (13), of the oil distribution disc (10) and a regulator, part of high-pressure oil of the oil outlet (14) enters between the end face, close to the oil inlet (13), of the oil distribution disc (10) and the regulator, and deflection moment and side offset force of the oil distribution disc (10) are reduced or eliminated.

2. The method of eliminating eccentric wear of an oil distribution pan for a high-pressure plunger variable displacement pump according to claim 1, wherein: in the step d, a first throttling hole (18) is arranged between the first oil port (17) and the oil channel (21) to adjust the oil pressure of the first oil port (17), and a second throttling hole (22) is arranged on the oil channel (21) to adjust the oil pressure of the second oil port (19).

3. The method of eliminating eccentric wear of an oil distribution pan for a high-pressure plunger variable displacement pump according to claim 1, wherein: in the step d, a pressure limiting ring (20) surrounding the first oil port (17) is arranged on the end face of the oil distribution disc (10), so that oil flowing out of the first oil port (17) permeates into the pressure limiting ring (20) through a small gap between the oil distribution disc (10) and the slide way (16), the oil pressure of the oil flowing out of the first oil port (17) on the oil distribution disc (10) is increased, and the oil pressure of the oil on the oil distribution disc (10) is changed by changing the area of the pressure limiting ring (20).

4. The method of eliminating eccentric wear of an oil distribution pan for a high-pressure plunger variable displacement pump according to claim 1, wherein: in step d, there are two second oil ports.

5. The method of eliminating eccentric wear of an oil distribution pan for a high-pressure plunger variable displacement pump according to claim 4, wherein: in the step c, the offset forces of the oil distribution disc (10) in the X-axis direction, the Y-axis direction and the Z-axis direction are respectively Fx, Fy and Fz, and the three deflection moments around the X-axis direction, the Y-axis direction and the Z-axis direction are respectively Mx, My and Mz obtained through simulation calculation;

in the step d, the area of the pressure limiting ring 20 is changed, so that the oil pressure Fx generated by the oil liquid flowing out of the first oil port (17) on the oil distribution disc (10) is equal to and opposite to Fx;

the size of resultant force generated by the oil flowing out of the second oil port (19) on the oil distribution disc (10) is changed by changing the size of the second oil port (19) or the diameter of the second throttling hole (22), the direction of the resultant force is changed by changing the position of the second oil port (19) on the oil distribution disc (12), the resultant force is decomposed, oil pressure Fy to the oil distribution disc (10) is formed on the Y axis, oil pressure Fz to the oil distribution disc (10) is formed on the Z axis, and Fy and Fy are equal in size and opposite in direction, and Fz and Fz are equal in size and opposite in direction;

the arm length of fx and Z axis is L1Z, the arm length of fx and Y axis is L1Y, the arm length of fy and Z axis is L2Z, the arm length of fy and X axis is L2X, the arm length of fz and Y axis is L2Y, and the arm length of fz and X axis is L2X;

by changing the positions of the first oil port (17) and the second oil port (19) on the oil distribution disc, the-Mx-fz L2 y-fy-L2 z, -My-fx-L1 z-fz-L2 x and Mz-fy-L2 x-fx-L1 y are all eliminated, and the deflection moment and the side deflection force on the oil distribution disc are all eliminated.

Technical Field

The invention belongs to the field of high-pressure inclined shaft type variable plunger pumps, and particularly relates to a method for eliminating eccentric wear of an oil distribution disc of a high-pressure plunger variable pump.

Background

A high-pressure oblique-shaft type plunger variable pump structure comprises a pump shell with an opening at one end, a regulator shell is arranged at the opening end of the pump shell, a main shaft which is rotatably connected is arranged in the pump shell, one end of the main shaft extends out of the pump shell, a cylinder body is arranged on the outer side of the other end of the main shaft, an included angle is formed between the axis of the cylinder body and the axis of the main shaft, a central rod is arranged between the cylinder body and the main shaft, a plurality of circumferentially distributed plunger rods are arranged on the outer side of the central rod, one end of the central rod and one end of each plunger rod are both hinged with a main shaft ball, a central hole which is inserted into the other end of the central rod is arranged in the cylinder body, a plunger hole which is inserted into by the plunger rod is arranged in the cylinder body, an oil distribution disc which is slidably connected with a regulator is arranged on one side of the cylinder body, one side of the oil distribution disc is spherical and is hinged with the cylinder body through the spherical surface, a slide way which is matched with the shape of the other side of the oil distribution disc, be equipped with inlet port and oil outlet on joining in marriage the food tray, the inlet port is connected to some plunger hole, and the oil outlet is connected to other plunger hole, is equipped with the driving lever in the regulator, and the driving lever stretches out the bottom surface of slide and inserts in joining in marriage the food tray. The working principle of the existing variable pump is that a main shaft drives a cylinder body to rotate around the axis of the main shaft through a plunger, a spring provides elasticity to enable the cylinder body to be pressed on an oil distribution disc, a pressure oil film lubrication exists between the cylinder body and the oil distribution disc, a regulator controls a deflector rod to rotate up and down to drive the oil distribution disc to slide in a cambered surface slideway of the regulator, the oil distribution disc drives the cylinder body to rotate up and down around a rotation center to change an included angle between the cylinder body and the main shaft, the displacement of the variable pump is changed along with the change of the displacement, and the rotation center is a spherical center of a spherical hinge of a center rod and the main shaft. During the use process, the oil distribution disc is easy to generate eccentric wear, namely, a friction pair between the oil distribution disc and the regulator is easy to generate eccentric wear, so that the service life of the variable displacement pump is short. Therefore, a method is needed to prevent eccentric wear of the oil distribution pan and to improve the service life of the variable displacement pump.

Disclosure of Invention

The invention aims to provide a method for eliminating eccentric wear of an oil distribution disc of a high-pressure plunger variable displacement pump. The invention has the advantage of preventing the eccentric wear of the oil distribution disc and can prolong the service life of the variable pump.

The technical scheme of the invention is as follows: an eccentric wear eliminating method for an oil distribution disc of a high-pressure plunger variable pump comprises the following steps:

a. establishing a three-dimensional space coordinate system, wherein the origin of the three-dimensional space coordinate system is the intersection point of the slide axis and the cylinder axis, the X axis of the three-dimensional space coordinate system is parallel to the slide axis, and the Z axis of the three-dimensional space coordinate system is vertical to the end surface of the regulator;

b. an oil film pressure distribution cloud picture between a cylinder body and the spherical surface of an oil distribution disc is established through simulation,

c. based on a three-dimensional space coordinate system and an oil film pressure distribution cloud picture, the offset force of the oil distribution disc in the X axis direction, the Y axis direction and the Z axis direction and three offset moments around the X axis direction, the Y axis direction and the Z axis direction are obtained through simulation calculation,

d. set up the oil duct between the inlet port and the oil outlet of joining in marriage the food tray, set up the first hydraulic fluid port of being connected with the oil duct on joining in marriage the food tray and being close to the end face of inlet port, set up the second hydraulic fluid port on joining in marriage the cambered surface that the food tray is close to the inlet port, make partly high-pressure fluid of oil outlet enter into join in marriage between the cambered surface that the food tray is close to the inlet port and the regulator, make partly high-pressure fluid of oil outlet enter into join in marriage between the end face that the food tray is close to the inlet port and the regulator, reduce or eliminate the deflection moment and the side force of joining in marriage the food tray.

In the method for eliminating eccentric wear of the oil distribution disc of the high-pressure plunger variable displacement pump, in the step d, a first throttling hole is formed between the first oil port and the oil passage to adjust the oil pressure of the first oil port, and a second throttling hole is formed in the oil passage to adjust the oil pressure of the second oil port.

In the method for eliminating eccentric wear of the oil distribution disc of the high-pressure plunger variable displacement pump, in the step d, the pressure limiting ring surrounding the first oil port is arranged on the end face of the oil distribution disc, so that oil flowing out of the first oil port permeates into the pressure limiting ring 20 through a tiny gap between the oil distribution disc 10 and the slideway 16, the oil pressure of the oil flowing out of the first oil port on the oil distribution disc is increased, and the oil pressure of the oil on the oil distribution disc is changed by changing the area of the pressure limiting ring 20.

In the method for eliminating eccentric wear of the oil distribution disc of the high-pressure plunger variable displacement pump, in the step d, there are two second oil ports.

In the method for eliminating eccentric wear of the oil distribution disc for the high-pressure plunger variable displacement pump, in the step c, the offset side forces of the oil distribution disc in the three directions of the X axis, the Y axis and the Z axis are Fx, Fy and Fz respectively, and the three offset moments around the X axis, the Y axis and the Z axis are Mx, My and Mz respectively;

in the step d, the area of the pressure limiting ring 20 is changed, so that the oil pressure Fx generated by the oil liquid flowing out from the first oil port on the oil distribution disc is equal to Fx and opposite in direction;

the size of a resultant force generated by the oil flowing out of the second oil port on the oil distribution disc is changed by changing the size of the second oil port or the diameter of the second throttling hole 22, the direction of the resultant force is changed by changing the position of the second oil port on the oil distribution disc, the resultant force is decomposed, an oil pressure Fy to the oil distribution disc is formed on the Y axis, an oil pressure Fz to the oil distribution disc is formed on the Z axis, and the Fy and the Fy are equal in size and opposite in direction, and the Fz and the Fz are equal in size and opposite in direction;

the arm length of fx and Z axis is L1Z, the arm length of fx and Y axis is L1Y, the arm length of fy and Z axis is L2Z, the arm length of fy and X axis is L2X, the arm length of fz and Y axis is L2Y, and the arm length of fz and X axis is L2X;

by changing the positions of the first oil port and the second oil port on the oil distribution disc, the-Mx-fz L2 y-fy-L2 z, -My-fx-L1 z-fz-L2 x and Mz-fy-L2 x-fx-L1 y are all eliminated, and the deflection moment and the offset force on the oil distribution disc are all eliminated.

Compared with the prior art, the applicant finds out through long-time research, experiments and analysis that the main reason for eccentric wear of the oil distribution disc is as follows: in the use process of the variable displacement pump, due to frequent occurrence of high-pressure variables, the oil distribution disc frequently rubs with the regulator, namely, the cambered surface on the oil distribution disc frequently rubs with the slideway on the regulator, due to the fact that a high-low pressure area exists on the spherical surface of the oil distribution disc, the high-pressure area is located near the oil outlet of the oil distribution disc, the low-pressure area is located near the oil inlet of the oil distribution disc, the high-low pressure area is not uniformly stressed, large deflection moment and lateral deflection force are generated on the oil distribution disc, large pressing force is generated between the oil distribution disc and the regulator, the friction pair between the oil distribution disc and the regulator is easily abraded, namely, the oil distribution disc is easily abraded (at the position pointed by M in figure 2), and the service life of the variable displacement pump is shortened. On the basis of the existing variable pump, the high-pressure oil near the oil outlet of the oil distribution disc is guided to the easily-worn area near the oil inlet of the oil distribution disc through the oil passage and the throttling hole to form static pressure supporting force so as to balance the deflection moment and the side force of the oil distribution disc, reduce or even avoid eccentric wear of the oil distribution disc and prolong the service life of the variable pump. Therefore, the invention has the advantage of preventing the eccentric wear of the oil distribution disc and can prolong the service life of the variable pump.

Drawings

Fig. 1 is a schematic view of a structure of a conventional variable displacement pump.

Fig. 2 is a schematic diagram of a prior art variable displacement pump regulator, oil distribution pan and cylinder after explosion.

Fig. 3 is a front view of the oil distribution pan of the present invention.

Fig. 4 is a left side view of the oil distribution pan of the present invention.

Fig. 5 is a cloud of oil film pressure distribution on the spherical surface of a conventional oil distribution pan.

The labels in the figures are: the oil pump comprises a pump shell 1, a regulator 2, a main shaft 3, a cylinder 4, a center rod 5, a plunger rod 6, a center hole 7, a spring 8, a plunger hole 9, an oil distribution disc 10, a spherical surface 11, a cambered surface 12, an oil inlet 13, an oil outlet 14, a deflector rod 15, a slideway 16, a first oil port 17, a first throttling hole 18, a second oil port 19, a pressure limiting ring 20, an oil duct 21 and a second throttling hole 22.

Detailed Description

The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.

Examples are given. A high-pressure plunger variable pump with an oil distribution disc not prone to eccentric wear comprises a pump shell 1 with an opening at one end, a regulator 2 is arranged at the opening end of the pump shell 1, a main shaft 3 connected in a rotating mode is arranged in the pump shell 1, one end of the main shaft 3 extends out of the pump shell 1, a cylinder body 4 is arranged on the outer side of the other end of the main shaft 3, an included angle is formed between the axis of the cylinder body 4 and the axis of the main shaft 3, a central rod 5 is arranged between the cylinder body 4 and the main shaft 3, a plurality of plunger rods 6 distributed in the circumferential direction are arranged on the outer side of the central rod 5, one end of the central rod 5 and one end of each plunger rod 6 are both in spherical hinge connection with the main shaft 3, a central hole 7 inserted into the other end of the central rod 5 is arranged on the cylinder body 4, a spring 8 is arranged in the central hole 7, a plunger hole 9 inserted into the plunger rod 6 is arranged on the cylinder body 4, an oil distribution disc 10 connected with the regulator 2 in a sliding mode is arranged on one side of the oil distribution disc 10, and is a spherical surface 11, the spherical regulator is in spherical hinge with the cylinder body 4 through the spherical surface 11, the regulator 2 is provided with a slide 16 matched with the shape of the other side of the oil distribution disc 10, the other side of the oil distribution disc 10 is a cambered surface 12, the oil distribution disc 10 is provided with an oil inlet hole 13 and an oil outlet hole 14, one part of the plunger holes 9 is connected with the oil inlet hole 13, the other part of the plunger holes 9 is connected with the oil outlet hole 14, the regulator 2 is internally provided with a deflector rod 15, and the deflector rod 15 extends out of the bottom surface of the slide 16, is inserted into the oil distribution disc 10 and keeps in spherical hinge with the oil distribution disc 10.

The eccentric wear eliminating method of the oil distributing disc for the high-pressure plunger variable pump comprises the following steps: the method comprises the following steps:

a. establishing a three-dimensional space coordinate system, wherein the original point of the three-dimensional space coordinate system is the intersection point of the axis of the slideway 16 and the axis of the cylinder body 4, the X axis of the three-dimensional space coordinate system is parallel to the axis of the slideway 16, and the Z axis of the three-dimensional space coordinate system is vertical to the end surface of the regulator 2;

b. an oil film pressure distribution cloud picture between the cylinder body 4 and the spherical surface 11 of the oil distribution disc 10 is established through simulation,

c. based on a three-dimensional space coordinate system and an oil film pressure distribution cloud picture, the offset force of the oil distribution disc 10 in the X-axis direction, the Y-axis direction and the Z-axis direction and three offset moments around the X-axis direction, the Y-axis direction and the Z-axis direction are obtained through simulation calculation,

d. an oil duct 21 is arranged between an oil inlet 13 and an oil outlet 14 of the oil distribution disc 10, a first oil port 17 connected with the oil duct 21 is arranged on the end face of the oil distribution disc 10 close to the oil inlet 13, and a second oil port 19 is arranged on the cambered surface 12 of the oil distribution disc 10 close to the oil inlet 13, so that part of high-pressure oil of the oil outlet 14 enters between the cambered surface 12 of the oil distribution disc 10 close to the oil inlet 13 and the regulator 2, and part of high-pressure oil of the oil outlet 14 enters between the end face of the oil distribution disc 10 close to the oil inlet 13 and the regulator 2, and the deflection moment and the side offset force of the oil distribution disc 10 are reduced or eliminated.

In the step d, the oil pressure of the first oil port 17 is adjusted by setting the first throttle 18 between the first oil port 17 and the oil passage 21, and the oil pressure of the second oil port 19 is adjusted by setting the second throttle 22 on the oil passage 21.

In the step d, the pressure limiting ring 20 surrounding the first oil port 17 is arranged on the end surface of the oil distribution disc 10, so that the oil liquid flowing out from the first oil port 17 permeates into the pressure limiting ring 20 through a tiny gap between the oil distribution disc 10 and the slideway 16, the oil pressure of the oil liquid flowing out from the first oil port 17 on the oil distribution disc 10 is increased, and the oil pressure of the oil liquid on the oil distribution disc 10 is changed by changing the area of the pressure limiting ring 20.

In step d, there are two second oil ports 19.

In the step c, the offset forces of the oil distribution disc 10 in the three directions of the X axis, the Y axis and the Z axis are respectively Fx, Fy and Fz, and the three deflection moments around the X axis, the Y axis and the Z axis are respectively Mx, My and Mz obtained through simulation calculation;

in the step d, the area of the pressure limiting ring 20 is changed, so that the oil pressure Fx generated by the oil liquid flowing out from the first oil port 17 on the oil distribution disc 10 is equal to Fx and opposite in direction;

the magnitude of resultant force generated by the oil liquid flowing out of the second oil port 19 on the oil distribution disc 10 is changed by changing the magnitude of the second oil port 19 or the diameter of the second throttle hole 22, the direction of the resultant force is changed by changing the position of the second oil port 19 on the oil distribution disc 10, the resultant force is decomposed, oil pressure Fy to the oil distribution disc 10 is formed on the Y axis, oil pressure Fz to the oil distribution disc 10 is formed on the Z axis, and the Fy and the Fy are equal in magnitude and opposite in direction, and the Fz and the Fz are equal in magnitude and opposite in direction;

the arm length of fx and Z axis is L1Z, the arm length of fx and Y axis is L1Y, the arm length of fy and Z axis is L2Z, the arm length of fy and X axis is L2X, the arm length of fz and Y axis is L2Y, and the arm length of fz and X axis is L2X;

by changing the positions of the first oil port 17 and the second oil port 19 on the oil distribution disc, the-Mx ═ fz L2y-fy ═ L2z, -My ═ fx ═ L1z-fz × L2x, and Mz ═ fy ═ L2x-fx × L1y are realized, the deflection moment and the offset force on the oil distribution disc are eliminated, and at the moment, the oil distribution disc 10 does not generate offset wear.

Because Fx, Fy, Fz, Mx, My and Mz can be known through finite element calculation, the first oil port 17 and the second oil port 19 are limited in a geometric area of the surface of the oil distribution disc, the size of the oil distribution disc 10 is also known, and the requirement of the three formulas is met, only one group of effective solutions exists, the length of each force arm can be calculated, and the specific positions of the first oil port 17 and the second oil port 19 on the oil distribution disc 10 can be known. Since the number of the first oil ports 17 is only 1, the position of the first oil ports 17 is unique, but the number of the second oil ports 19 is not limited, and may be one, two or more than three, but the range of the force field generated by one second oil port 19 is limited, and the processing of the three or more second oil ports 19 is troublesome, the number of the second oil ports 19 is preferably two in the embodiment. The two second oil ports 19 form resultant force to the oil pressure of the oil distribution disc, the resultant force passes through the midpoint of the connecting line of the two second oil ports 19, and the specific position of the midpoint on the arc surface can be obtained according to the calculated L1z, L1y, L2z and L2x, and the two second oil ports 19 only need to be symmetrically distributed on the arc surface 12 about the midpoint. In addition, in practice, when the number of the second oil ports 19 is changed to one, the position of the midpoint is the position of the second oil port 19; when the number of the second oil ports 19 is changed to three or more, the positions of the plurality of second oil ports 19 also need to be uniformly distributed around the midpoint position.

The invention has the advantage of preventing the eccentric wear of the oil distribution disc and can prolong the service life of the variable pump.