阅读说明：本技术 一种柱塞泵旋转组件绕流损失模拟测量方法 (Plunger pump rotating assembly streaming loss simulation measurement method ) 是由 潮群 雷军波 陶建峰 刘成良 贡亮 于 2021-08-24 设计创作，主要内容包括：本发明公开了一种柱塞泵旋转组件绕流损失模拟测量方法：将测试泵缸体轴的伸出端连接扭矩传感器,扭矩传感器连接驱动电机；将测试泵壳体内的油液排出,使壳体内的缸体轴和柱塞与油液分离,启动驱动电机,通过扭矩传感器测得空载状态下的摩擦力矩M-(0)；将柱塞置于缸体轴内部,油液注满壳体内部,启动驱动电机,缸体轴参与绕流运动,通过扭矩传感器测得绕流阻力矩M-(1)；将柱塞露出缸体轴外部,油液注满壳体内部,启动驱动电机,缸体轴和柱塞均参与绕流运动,通过扭矩传感器测得绕流阻力矩M-(2)；缸体轴在充液壳体内的绕流阻力矩M-(c)＝M-(1)-M-(0)；柱塞在充液的壳体内的绕流阻力矩M-(p)＝M-(2)-M-(1)。(The invention discloses a method for simulating and measuring the streaming loss of a plunger pump rotating assembly, which comprises the following steps: connecting the extending end of the cylinder shaft of the test pump with a torque sensor, and connecting the torque sensor with a driving motor; discharging oil in the test pump shell, separating a cylinder shaft and a plunger in the shell from the oil, starting a driving motor, and measuring the friction torque M in an idle state through a torque sensor 0 (ii) a Arranging a plunger inside a cylinder shaft, filling oil into the shell, starting a driving motor, enabling the cylinder shaft to participate in the bypass flow movement, and measuring bypass flow resistance moment M through a torque sensor 1 (ii) a The plunger piston is exposed out of the cylinder shaft, the oil is filled in the shell, the driving motor is started, the cylinder shaft and the plunger piston both take part in the circumfluence movement,measuring the bypass flow resistance moment M through a torque sensor 2 (ii) a Circumferential flow resistance moment M of cylinder shaft in liquid filling shell c ＝M 1 ‑M 0 (ii) a Bypass flow resistance M of plunger in liquid filled housing p ＝M 2 ‑M 1 。)

1. A plunger pump rotating assembly bypass flow loss simulation measurement method is characterized by comprising the following steps:

s1, connecting the extending end of the cylinder shaft (3) of the test pump with a torque sensor, wherein the torque sensor is connected with a driving motor;

s2, discharging oil in the shell (1) of the test pump, separating a cylinder shaft (3) and a plunger (5) in the shell (1) from the oil, starting the driving motor, and measuring the friction torque M in the no-load state through the torque sensor₀；

S3, the plunger (5) is arranged in the cylinder shaft (3), oil is filled in the shell (1), the driving motor is started, the cylinder shaft (3) participates in the bypass motion, and bypass resistance moment M is measured through the torque sensor₁；

S4, exposing the plunger (5) to the outside of the cylinder shaft (3), filling the shell (1) with oil, starting the driving motor, enabling the cylinder shaft (3) and the plunger (5) to participate in the flow-bypassing motion, and measuring the flow-bypassing resistance moment M through the torque sensor₂；

S5, and the flow-around resistance moment M of the cylinder shaft (3) in the filled housing (1)_c＝M₁-M₀(ii) a The flow-around resistance M of the plunger (5) in the liquid-filled housing (1)_p＝M₂-M₁。

2. The plunger pump rotating assembly bypass flow loss simulation measuring method according to claim 1, characterized in that a plurality of thermocouples (7) are installed inside the shell (1) and used for obtaining a bypass flow field temperature change value.

3. The analog measuring method for the plunger pump rotating assembly bypass flow loss according to claim 1, wherein the test pump comprises:

a housing (1); the shell (1) is of a cylindrical structure with an upper opening and a lower opening; an oil outlet (11) is formed in the side wall of the bottom end of the shell (1);

an upper end cap (2); the upper end cover (2) is connected to the opening at the top end of the shell (1) in a sealing mode, and an oil inlet (21) is formed in the middle of the upper end cover;

a cylinder shaft (3); the cylinder shaft (3) comprises a shaft body (31) and a cylinder body (32); the shaft body (31) is connected with an opening at the bottom end of the shell (1) in a sealing and rotating mode through a bearing assembly (6), and the bottom end of the shaft body (31) extends out of the shell (1); the cylinder body (32) is fixed at the top end of the shaft body (31), and a gap is formed between the cylinder body and the inner wall of the shell (1) and the upper end cover (2); a plurality of plunger cavities (321) which are communicated up and down are uniformly distributed in the cylinder body (32) around the rotation center; the plunger cavity (321) is a primary stepped hole, the aperture of the top of the primary stepped hole is larger than that of the bottom of the primary stepped hole, and the inner wall of the bottom hole is provided with internal threads;

a cylinder friction plate (4); the cylinder friction plate (4) is fixed on the top surface of the cylinder (32), the bottom surface of the cylinder friction plate is provided with a matching hole (41) which corresponds to the top hole of the primary stepped hole and has the same aperture, and a gap is formed between the top surface and the upper end cover (2);

a plunger (5); the plunger (5) comprises a thread section (51) and a turbulent flow section (52) which are connected in sequence; the threaded section (51) is connected with the internal thread; the turbulent flow section (52) is located below the cylinder body (32) or located in a top hole of the first-stage stepped hole and the matching hole (41).

4. The analog measurement method for the streaming loss of the rotating assembly of the plunger pump as claimed in claim 3, characterized in that the top edge of the shell (1) is provided with an upper flange (12) for connecting with the upper end cover (2), and the upper flange (12) is connected with the upper end cover (2) through screws; the bottom edge of the shell (1) is provided with a lower flange plate (13), the bottom edge of the shell (1) is provided with an annular frame (14) protruding radially towards the inner cavity of the shell, the bottom surface of the annular frame (14) is provided with a mounting cylinder (15) extending downwards, and the annular frame (14) and the mounting cylinder (15) are used for being connected with the bearing assembly (6).

5. A plunger pump rotating group bypass flow loss simulation measuring method according to claim 4, characterized in that the bearing assembly (6) comprises a thrust bearing (61), a bearing (62) and a bearing end cover (63); the thrust bearing (61) is sleeved on the shaft body (31) and clamped in a counter bore (141) formed in the top surface of a through hole in the middle of the annular frame (14); the inner ring of the bearing (62) is sleeved on the shaft body (31), and the outer ring is sleeved inside the mounting cylinder (15); the bearing end cover (63) is connected with the bottom end of the mounting cylinder (15) through a screw.

6. The analog measurement method for the bypass flow loss of the rotary assembly of the plunger pump according to claim 5, characterized in that the shaft body (31) is provided with a radial convex ring (311) abutting against the top surface of the thrust bearing (61).

7. The method for analog measurement of the flow-around loss of the rotating assembly of the plunger pump according to claim 4, wherein an annular sealing groove (121) is formed in the top surface of the upper flange (12), and a sealing ring is arranged in the sealing groove (121).

8. The analog measurement method for the plunger pump rotating assembly bypass flow loss according to claim 4, characterized in that one end of the oil outlet (11) is arranged on the top surface of the annular frame (14), and the other end is arranged on the side wall of the lower flange (13).

9. The plunger pump rotating assembly bypass flow loss simulation measuring method according to claim 3, characterized in that a plurality of thermocouples (7) extending into the shell (1) are installed on the top surface of the upper end cover (2).

10. The analog measurement method for the streaming loss of the rotating assembly of the plunger pump as claimed in claim 3, wherein the threaded section (51) is provided with a straight groove (511) at the end.

Technical Field

The invention relates to the technical field of hydraulic elements, in particular to a method for analog measurement of the streaming loss of a rotating assembly of a plunger pump.

Background

Axial plunger pumps/motors are one of the most important power/actuator elements in fluid transmission and control disciplines and are widely and deeply used in various industries. Because the inside of the pump/motor housing is filled with hydraulic oil with certain viscosity, the high-speed streaming motion of the rotating member inside the housing causes power losses such as viscous friction loss and local eddy current loss, which are collectively called "streaming loss". The bypass loss has an important influence on the efficiency of the axial plunger pump/motor, especially when the pump/motor works at a high rotation speed, such as an aerospace pump applied in the field of aerospace, the rotation speed is basically in the order of tens of thousands of revolutions per minute, and the high speed is a necessary trend of the development of the axial plunger pump/motor, so that the method has important significance for the related research of the bypass loss.

The plunger pump rotating assembly bypass flow loss mainly comprises two parts: firstly, the cylinder body and the driving shaft generate bypass flow loss; the second is the bypass loss generated by the plunger mounted on the cylinder. The technical scheme and research provided in the prior art can only realize the overall measurement of the above bypass loss generally, and can not strip off each bypass loss, so that the bypass loss research of the plunger pump rotating assembly can not be further deepened.

Therefore, how to provide a simulation measurement method capable of performing various types of loss stripping on the plunger pump rotating assembly bypass flow loss is a problem that needs to be solved by those skilled in the art.

Disclosure of Invention

In view of the above, the present invention provides a method for analog measurement of the flow loss of a plunger pump rotating assembly, which aims to solve the above technical problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

a plunger pump rotating assembly bypass flow loss simulation measurement method comprises the following steps:

s1, connecting the extending end of the cylinder shaft of the test pump with a torque sensor, wherein the torque sensor is connected with a driving motor;

s2, discharging oil in the shell of the test pump, separating a cylinder shaft and a plunger in the shell from the oil, starting the driving motor, and measuring the friction torque M in the no-load state through the torque sensor₀；

S3, placing the plunger inside the cylinder shaft, filling the shell with oil, starting the driving motor, enabling the cylinder shaft to participate in the bypass motion, and measuring bypass resistance moment M through the torque sensor₁；

S4, exposing the plunger out of the cylinder shaft, filling oil into the shell, starting the driving motor, enabling the cylinder shaft and the plunger to participate in the bypass motion, and measuring bypass resistance moment M through the torque sensor₂；

S5, and the bypass flow resistance moment M of the cylinder shaft in the liquid-filled shell_c＝M₁-M₀(ii) a The circumferential flow resistance moment M of the plunger in the filled housing_p＝M₂-M₁。

According to the technical scheme, the moment of the shell in the oil-free state, the moment of the shell in the liquid-filled state and the moment of the shell in the cylinder and the plunger in the liquid-filled state are measured in sequence, the flow-around resisting moment of the cylinder shaft and the plunger in the liquid-filled shell can be stripped through operation, data refining is achieved, and the flow-around resisting moment of the cylinder shaft and the plunger is accurately measured under the condition that the rotation inertia of the rotating structure is not changed.

Preferably, in the analog measurement method for the bypass flow loss of the plunger pump rotating assembly, a plurality of thermocouples are installed inside the casing and used for obtaining the temperature change value of the bypass flow field.

Preferably, in the above method for analog measurement of the plunger pump rotating assembly bypass flow loss, the test pump includes:

a housing; the shell is of a cylindrical structure with an upper opening and a lower opening; an oil outlet is formed in the side wall of the bottom end of the shell;

an upper end cover; the upper end cover is connected to the opening at the top end of the shell in a sealing mode, and an oil inlet is formed in the middle of the upper end cover;

a cylinder shaft; the cylinder body shaft comprises a shaft body and a cylinder body; the shaft body is in sealed rotary connection with an opening at the bottom end of the shell through a bearing assembly, and the bottom end of the shaft body extends out of the shell; the cylinder body is fixed at the top end of the shaft body, and a gap is formed between the cylinder body and the inner wall of the shell and between the cylinder body and the upper end cover; the cylinder body is provided with a plurality of plunger cavities which are communicated up and down at equal intervals around a rotation center; the plunger cavity is a primary stepped hole, the aperture of the top of the primary stepped hole is larger than that of the bottom of the primary stepped hole, and the inner wall of the bottom hole is provided with internal threads;

a cylinder friction plate; the cylinder friction plate is fixed on the top surface of the cylinder, the bottom surface of the cylinder friction plate is provided with a matching hole which corresponds to the top hole of the primary stepped hole and has the same aperture, and a gap is formed between the top surface and the upper end cover;

a plunger; the plunger comprises a thread section and a turbulent flow section which are connected in sequence; the thread section is connected with the internal thread; the vortex section is located cylinder body below or be located the top hole of one-level shoulder hole with inside the mating holes.

The test pump structure provided by the invention has the advantages that: the plunger is detachably connected with the cylinder body through threads, two connection modes of the cylinder body and the plunger, namely an internal connection mode and an external connection mode, can be realized, and the plunger can be simply and conveniently selected.

Preferably, in the analog measurement method for the streaming loss of the plunger pump rotating assembly, the top edge of the shell is provided with an upper flange plate used for being connected with the upper end cover, and the upper flange plate is connected with the upper end cover through screws; the casing bottom edge is provided with a lower flange disc, the casing bottom edge is provided with an annular frame protruding towards the radial direction of an inner cavity of the casing bottom edge, the bottom surface of the annular frame is provided with a mounting cylinder extending downwards, and the annular frame and the mounting cylinder are used for being connected with the bearing assembly. The connecting and mounting of the corresponding parts of the shell are facilitated.

Preferably, in the plunger pump rotating assembly bypass flow loss simulation measuring method, the bearing assembly comprises a thrust bearing, a bearing and a bearing end cover; the thrust bearing is sleeved on the shaft body and clamped in a counter bore formed in the top surface of the through hole in the middle of the annular frame; the bearing inner ring is sleeved on the shaft body, and the outer ring is sleeved inside the mounting cylinder; the bearing end cover is connected with the bottom end of the mounting cylinder through a screw. The requirement of the rotational stability of the shaft body can be met.

Preferably, in the analog measurement method for the plunger pump rotating assembly circumferential flow loss, the shaft body has a radial protruding ring abutting against the thrust bearing top surface. Can satisfy the installation demand.

Preferably, in the analog measurement method for the streaming loss of the plunger pump rotating assembly, an annular sealing groove is formed in the top surface of the upper flange plate, and a sealing ring is arranged in the sealing groove in a gasket mode. The sealing performance can be improved.

Preferably, in the analog measurement method for plunger pump rotating assembly bypass flow loss, one end of the oil outlet is formed in the top surface of the annular frame, and the other end of the oil outlet is formed in the side wall of the lower flange. The structure layout is reasonable.

Preferably, in the analog measurement method for the plunger pump rotating assembly bypass flow loss, a plurality of thermocouples extending into the shell are mounted on the top surface of the upper end cover. For obtaining a value of the temperature change around the flow field.

Preferably, in the analog measurement method for the streaming loss of the plunger pump rotating assembly, a straight groove is formed in the end of the threaded section. The plunger is convenient to screw.

Preferably, in the analog measurement method for plunger pump rotating assembly bypass flow loss, the cylinder is a cylinder and has a diameter equal to that of the cylinder friction plate. The structural integrity is strong.

Compared with the prior art, the method for simulating and measuring the bypass flow loss of the rotary assembly of the plunger pump has the following advantages that:

1. the invention firstly measures the moment of the shell in oil-free state, the moment of the shell in liquid-filled state, and the moment of the shell in liquid-filled state and the moment of the cylinder and the plunger in liquid-filled state in sequence, and then the circumferential flow resistance moment of the cylinder shaft and the plunger in the liquid-filled shell can be stripped through calculation, thereby realizing data refinement, and accurately measuring the circumferential flow resistance moment of the cylinder shaft and the plunger under the condition of ensuring that the rotational inertia of the rotary structure is not changed.

2. The test pump structure provided by the invention has the advantages that: the plunger is detachably connected with the cylinder body through threads, two connection modes of the cylinder body and the plunger, namely an internal connection mode and an external connection mode, can be realized, and the plunger can be simply and conveniently selected.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a cross-sectional view of a test pump configuration provided by the present invention;

FIG. 2 is a schematic diagram of the external structure of a test pump according to the present invention;

FIG. 3 is a schematic structural view of the cylinder shaft and the cylinder friction plate provided by the invention after being matched;

FIG. 4 is a schematic view of a cylinder shaft structure provided by the present invention;

FIG. 5 is a schematic view of a plunger according to the present invention;

FIG. 6 is a cross-sectional view of the plunger in an outboard position according to the present invention;

FIG. 7 is a sectional view of the plunger according to the present invention in a built-in state;

FIG. 8 is a schematic view of a housing construction provided by the present invention;

FIG. 9 is a schematic view of a bearing end cap structure provided by the present invention.

Wherein:

1-a shell;

11-an oil outlet; 12-an upper flange plate; 121-seal groove; 13-lower flange; 14-an annular frame; 141-counterbores; 15-mounting the cylinder;

2-upper end cover;

21-an oil inlet;

3-cylinder axis;

31-a shaft body; 311-radial convex ring; 32-cylinder body; 321-a plunger cavity;

4-cylinder friction plate;

41-mating holes;

5-a plunger;

51-a threaded segment; 511-a straight slot; 52-a burbling section;

6-a bearing assembly;

61-a thrust bearing; 62-a bearing; 63-bearing end caps;

7-thermocouple.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the invention discloses a method for analog measurement of the streaming loss of a rotating assembly of a plunger pump, which comprises the following steps:

s1, connecting the extending end of the cylinder shaft 3 of the test pump with a torque sensor, and connecting the torque sensor with a driving motor;

s2, discharging the oil in the shell 1 of the test pump, separating the cylinder shaft 3 and the plunger 5 in the shell 1 from the oil, starting the driving motor, and sensing the torqueThe device measures the friction moment M under the no-load state₀；

S3, the plunger 5 is placed in the cylinder shaft 3, oil is filled in the shell 1, the driving motor is started, the cylinder shaft 3 participates in the bypass motion, and the bypass resistance moment M is measured through the torque sensor₁；

S4, exposing the plunger 5 out of the cylinder shaft 3, filling oil into the shell 1, starting the driving motor, enabling the cylinder shaft 3 and the plunger 5 to participate in the bypass motion, and measuring bypass resistance moment M through a torque sensor₂；

S5, the bypass flow resistance moment M of the cylinder shaft 3 in the liquid filling shell 1_c＝M₁-M₀(ii) a The circumferential flow resistance M of the plunger 5 in the liquid-filled housing 1_p＝M₂-M₁。

In order to further optimize the above technical solution, a plurality of thermocouples 7 are installed inside the housing 1 for obtaining temperature variation values around the flow field.

Referring to fig. 1 to 9, the test pump includes:

a housing 1; the shell 1 is a cylindrical structure with an upper opening and a lower opening; an oil outlet 11 is formed in the side wall of the bottom end of the shell 1;

an upper end cover 2; the upper end cover 2 is hermetically connected to an opening at the top end of the shell 1, and an oil inlet 21 is formed in the middle of the upper end cover;

a cylinder shaft 3; the cylinder shaft 3 includes a shaft body 31 and a cylinder 32; the shaft body 31 is connected with the opening at the bottom end of the shell 1 in a sealing and rotating mode through a bearing assembly 6, and the bottom end of the shaft body 31 extends out of the shell 1; the cylinder body 32 is fixed at the top end of the shaft body 31, and a gap is formed between the cylinder body and the inner wall of the shell 1 and the upper end cover 2; a plurality of plunger cavities 321 which are communicated up and down are uniformly distributed on the cylinder body 32 around the rotation center; the plunger cavity 321 is a first-stage stepped hole, the top aperture of the first-stage stepped hole is larger than the bottom aperture, and the inner wall of the bottom hole is provided with internal threads;

a cylinder friction plate 4; the cylinder friction plate 4 is fixed on the top surface of the cylinder 32, the bottom surface of the cylinder friction plate is provided with a matching hole 41 which corresponds to the top hole of the first-stage stepped hole and has the same aperture, and a gap is formed between the top surface and the upper end cover 2;

a plunger 5; the plunger 5 comprises a threaded section 51 and a turbulent section 52 which are connected in sequence; the threaded section 51 is connected with the internal thread; the turbulator section 52 is located below the cylinder 32 or inside the top hole of the primary stepped bore and the mating hole 41.

In order to further optimize the technical scheme, the top edge of the shell 1 is provided with an upper flange 12 used for being connected with the upper end cover 2, and the upper flange 12 is connected with the upper end cover 2 through screws; the bottom edge of the shell 1 is provided with a lower flange 13, the bottom edge of the shell 1 is provided with an annular frame 14 protruding radially towards the inner cavity of the shell, the bottom surface of the annular frame 14 is provided with a mounting cylinder 15 extending downwards, and the annular frame 14 and the mounting cylinder 15 are used for being connected with the bearing assembly 6.

In order to further optimize the above technical solution, the bearing assembly 6 comprises a thrust bearing 61, a bearing 62 and a bearing end cover 63; the thrust bearing 61 is sleeved on the shaft body 31 and clamped in a counter bore 141 formed in the top surface of the through hole in the middle of the annular frame 14; the inner ring of the bearing 62 is sleeved on the shaft body 31, and the outer ring is sleeved inside the mounting cylinder 15; the bearing end cover 63 is connected with the bottom end of the mounting cylinder 15 through screws.

In order to further optimize the above technical solution, the shaft body 31 has a radial protruding ring 311 abutting on the top surface of the thrust bearing 61.

In order to further optimize the technical scheme, an annular sealing groove 121 is formed in the top surface of the upper flange 12, and a sealing ring is arranged in the sealing groove 121 in a cushioning mode.

In order to further optimize the technical scheme, one end of the oil outlet 11 is arranged on the top surface of the annular frame 14, and the other end of the oil outlet is arranged on the side wall of the lower flange 13.

In order to further optimize the above technical solution, a plurality of thermocouples 7 are installed on the top surface of the upper cap 2 to protrude into the interior of the housing 1.

In order to further optimize the technical scheme, the end of the threaded section 51 is provided with a straight groove 511.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.