阅读说明：本技术 一种长寿命高密封水泵及装配方法 (long-life high-sealing water pump and assembly method ) 是由 赵本华 龚康 姚旗 姜坤 任华兴 王燕 于震 陈少君 李茂伟 范天明 刘鑫 于 2019-09-11 设计创作，主要内容包括：一种长寿命高密封水泵及装配方法,涉及高密封水泵装配技术领域；泵体支架、电机支架、电机、联轴器、丝杠、换向器、活塞和缸体；泵体支架和电机支架对接；电机固定安装在电机支架上；联轴器设置在电机支架中；丝杠与电机输出轴同轴设置；丝杠的轴向一端伸入电机支架,且通过联轴器与电机的输出轴对接；活塞通过换向器与丝杠的轴向另一端对接；缸体套装在活塞的外壁；实现电机通过联轴器带动丝杠旋转；换向器将丝杠的转动转换为活塞的轴向平移运动；本发明解决了高密封水泵活塞部件运动卡滞、径向跳动大以及水泵使用寿命短、密封漏率超标等问题,实现了装配过程数字化检测,及时排查水泵性能问题,提高生产效率,缩短研制周期。(a long-life high-sealing water pump and an assembly method relate to the technical field of high-sealing water pump assembly; the pump body bracket, the motor, the coupler, the lead screw, the commutator, the piston and the cylinder body; the pump body bracket is butted with the motor bracket; the motor is fixedly arranged on the motor bracket; the coupler is arranged in the motor bracket; the screw rod and the motor output shaft are coaxially arranged; one axial end of the screw rod extends into the motor bracket and is butted with an output shaft of the motor through a coupler; the piston is butted with the other axial end of the screw rod through the commutator; the cylinder body is sleeved on the outer wall of the piston; the motor drives the screw rod to rotate through the coupler; the commutator converts the rotation of the screw rod into the axial translation motion of the piston; the invention solves the problems of high-sealing water pump piston part movement clamping stagnation, large radial run-out, short service life of the water pump, overproof sealing leakage rate and the like, realizes the digital detection in the assembly process, inspects the performance problem of the water pump in time, improves the production efficiency and shortens the development period.)

1. The utility model provides a high sealed water pump of long-life which characterized in that: comprises a pump body bracket (1), a motor bracket (2), a motor (3), a coupler (4), a lead screw (5), a commutator (6), a piston (7) and a cylinder body (8); wherein, the pump body bracket (1) is butted with the motor bracket (2); the motor (3) is fixedly arranged on the motor support (2), and an output shaft of the motor (3) points to the pump body support (1); the coupler (4) is arranged in the motor bracket (2), and the coupler (4) is butted with an output shaft of the motor (3); the screw rod (5) is arranged in the pump body bracket (1), and the screw rod (5) and the output shaft of the motor (3) are coaxially arranged; one axial end of the screw rod (5) extends into the motor bracket (2) and is butted with an output shaft of the motor (3) through a coupler (4); the commutator (6) is butted with the other axial end of the screw rod (5); the piston (7) is butted with the commutator (6); the cylinder body (8) is a hollow columnar structure; the cylinder body (8) is sleeved on the outer wall of the piston (7); the motor (3) drives the screw rod (5) to rotate through the coupler (4); the commutator (6) converts the rotation of the screw rod (5) into the axial translation motion of the piston (7); the piston (7) can do reciprocating linear motion in the cylinder body (8).

2. the long-life high-sealing water pump as claimed in claim 1, characterized in that: a first through hole (21) is formed in the side wall, away from the pump body support (1), of the motor support (2); the motor (3) is fixedly arranged in the first through hole (21), and the motor (3) is limited and fixed through the first through hole (21); a second through hole (11) is formed in the side wall, away from the motor support (2), of the pump body support (1); the cylinder body (8) is arranged in the second through hole (11); the cylinder body (8) is limited and fixed through the second through hole (11); a third through hole (22) is formed in the butt joint of the motor support (2) and the pump body support (1); the third through hole (22) axially penetrates through the motor support (2) and the pump body support (1); the lead screw (5) extends into the motor support (2) from the pump body support (1).

3. the long-life high-sealing water pump as claimed in claim 2, characterized in that: the water pump also comprises a bearing supporting seat and a bearing; wherein, the bearing supporting seat is arranged on the inner wall of the third through hole (22); the bearing is arranged on the inner wall of the bearing support seat; the lead screw (5) axially passes through the bearing.

4. the assembling method of the long-life high-sealing water pump is characterized in that: the method comprises the following steps:

step one, adjusting an external installation platform; horizontally placing the external mounting platform;

Secondly, placing the side wall of the pump body bracket (1) provided with the second through hole (11) on the upper surface of the external mounting platform; placing a motor support (2) at the top of a pump body support (1), wherein the side wall of the motor support (2) provided with a first through hole (21) is positioned at the top end of the motor support (2); fixedly connecting the pump body bracket (1) with the motor bracket (2);

Step three, horizontally placing the pump body bracket (1) and the motor bracket (2); mounting a bearing support seat and a bearing in the third through hole (22); a lead screw (5) is arranged in the bearing;

step four, testing the pre-tightening torque of the bearing by adopting a weight loading method; pre-tightening the bearing according to the torque obtained by the test;

fifthly, the piston (7) reciprocates in the cylinder body (8) along the axial direction, and the resistance of the piston (7) in the cylinder body (8) is tested; adjusting the test piston (7) until a preset resistance range is met; measuring the sealing leakage rate inside the cylinder body; adjusting the test piston (7) until the sealing leakage rate is met; assembling the piston (7) in the cylinder (8);

Sixthly, coating 2-5g of lubricating grease on the thread of the lead screw (5); butting the commutator (6) with the lead screw (5); assembling a cylinder body (8) on a pump body bracket (1), and butting a piston (7) with a lead screw (5) through a commutator (6); assembling the motor (3) on the motor bracket (2); an output shaft of the motor (3) is butted with a lead screw (5) through a coupler (4);

running in the water pump; and after running in, wiping off the lubricating grease, and smearing 2-5g of lubricating grease on the thread of the lead screw (5) again to finish the assembly.

5. The assembling method of a long life high sealing water pump according to claim 4, wherein: in the first step, the levelness of the external mounting platform is better than 0.05 mm/m.

6. The assembling method of a long life high sealing water pump according to claim 5, wherein: in the second step, the coaxiality of the second through hole (11), the first through hole (21) and the third through hole (22) is less than or equal to 0.02 mm.

7. The assembling method of a long life high sealing water pump according to claim 6, wherein: in the third step, the bearing and the bearing support seat are in clearance fit; the clearance between the bearing and the bearing support seat is 3-6 μm; the lead screw (5) is in clearance fit with the bearing; the clearance between the screw rod (5) and the bearing is 2-5 μm.

8. The assembling method of a long life high sealing water pump according to claim 6, wherein: in the fourth step, a weight is hung at one end of the lead screw (5); and rotating the lead screw (5); the primary loading moment is 0.5 Nm; loading the bearing at 0.25Nm moment each time one by one, and measuring the starting moment of the bearing under different loading moments; and until the nonlinear increase condition occurs, the moment after the last loading is the pre-tightening moment of the bearing.

9. The assembling method of a long life high sealing water pump according to claim 6, wherein: in the fifth step, the method for testing the resistance and adjusting the test piston (7) comprises the following steps:

S1, arranging an L-shaped supporting seat (9); the cylinder body (8) is axially and horizontally fixed at the top end of the L-shaped supporting seat (9); butting the adaptor (10) with the axial outer end of the piston (7); a digital push-pull dynamometer (13) is butted with the adapter (10); the piston (7) reciprocates in the cylinder (8) along the axial direction; the resistance of the piston (7) is measured in real time through a digital push-pull dynamometer (13);

S2: the resistance f value measured by the digital push-pull dynamometer (13) is judged,

When f is more than or equal to 75N and less than or equal to 125N, finishing the adjustment;

when f is less than 75N, the piston (7) with large outer diameter is replaced;

When f is larger than 125N, the piston (7) with small outer diameter is replaced; until f is more than or equal to 75N and less than or equal to 125N.

10. The method for assembling a long life highly sealed water pump as claimed in claim 9, wherein: in the fifth step, the method for testing the sealing leakage rate and adjusting the test piston (7) comprises the following steps:

the preset sealing leakage rate is not more than 10^-6Pa.m³s; the helium apocynum leak detection method is adopted to measure the sealing leak rate of the interior of the cylinder body (8), and when the sealing leak rate is more than 10^-6Pa.m³and at the time of/s, replacing the piston (7) with a large outer diameter until the requirement is met.

Technical Field

The invention relates to the technical field of high-sealing water pump assembly, in particular to a long-service-life high-sealing water pump and an assembly method.

Background

the high-sealing water pump is an important device of an environment-friendly and life-saving system of the space test cabin, and the performance of the high-sealing water pump influences the life safety of astronauts and the success or failure of space tests. The water pump is a universal component for fluid transmission, can be used for the following aerospace tasks such as deep space exploration and manned lunar landing, can be applied to important liquid transmission equipment on the ground, and has good application prospect and use value.

the water pump is a mechanical device for conveying liquid or pressurizing liquid, which transfers the mechanical energy of a prime motor or other external energy to the liquid to increase the capacity of the liquid, and the main conveying liquid comprises water, oil, acid-base liquid, emulsion, suspension, liquid metal and the like. The main technical parameters of the water pump performance include flow, suction lift, shaft power, water power, efficiency and the like. The pump can be divided into a volumetric water pump, a vane pump and the like according to different working principles. The displacement pump transfers energy by utilizing the change of the volume of a working chamber; the vane pump transfers energy by utilizing the interaction of a rotary vane and water, and mainly comprises an axial flow pump, a centrifugal pump, a mixed flow pump and the like.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a precision assembly method for a long-life high-sealing water pump, solves the problems of motion clamping stagnation and large radial run-out of a piston part of the high-sealing water pump, short service life of the water pump, excessive sealing leakage rate and the like, realizes digital detection in the assembly process, timely checks the performance problem of the water pump, improves the production efficiency and shortens the development period.

The above purpose of the invention is realized by the following technical scheme:

a long-life high-sealing water pump comprises a pump body support, a motor, a coupler, a lead screw, a commutator, a piston and a cylinder body; wherein, the pump body bracket is butted with the motor bracket; the motor is fixedly arranged on the motor bracket, and an output shaft of the motor points to the pump body bracket; the coupler is arranged in the motor bracket and is butted with an output shaft of the motor; the screw rod is arranged in the pump body bracket and is coaxially arranged with the output shaft of the motor; one axial end of the screw rod extends into the motor bracket and is butted with an output shaft of the motor through a coupler; the commutator is butted with the other axial end of the screw rod; the piston is butted with the commutator; the cylinder body is of a hollow columnar structure; the cylinder body is sleeved on the outer wall of the piston; the motor drives the screw rod to rotate through the coupler; the commutator converts the rotation of the screw rod into the axial translation motion of the piston; the reciprocating linear motion of the piston in the cylinder body is realized.

In the long-life high-sealing water pump, the side wall of the motor support, which is far away from the pump body support, is provided with the first through hole; the motor is fixedly arranged in the first through hole, and the motor is limited and fixed through the first through hole; a second through hole is formed in the side wall, away from the motor support, of the pump body support; the cylinder body is arranged in the second through hole; the cylinder body is limited and fixed through the second through hole; a third through hole is formed in the butt joint of the motor bracket and the pump body bracket; the third through hole axially penetrates through the motor support and the pump body support; the lead screw is stretched into the motor bracket from the pump body bracket.

In the long-life high-sealing water pump, the water pump further comprises a bearing support seat and a bearing; the bearing support seat is arranged on the inner wall of the third through hole; the bearing is arranged on the inner wall of the bearing support seat; the lead screw axially passes through the bearing.

an assembling method of a long-life high-sealing water pump comprises the following steps:

Step one, adjusting an external installation platform; horizontally placing the external mounting platform;

secondly, placing the side wall of the pump body bracket provided with the second through hole on the upper surface of the external mounting platform; placing a motor support at the top of the pump body support, wherein the side wall of the motor support, which is provided with a first through hole, is positioned at the top end of the motor support; fixedly connecting the pump body bracket with the motor bracket;

step three, horizontally placing the pump body bracket and the motor bracket; a bearing supporting seat and a bearing are arranged in the third through hole; a lead screw is arranged in the bearing;

step four, testing the pre-tightening torque of the bearing by adopting a weight loading method; pre-tightening the bearing according to the torque obtained by the test;

Fifthly, the piston reciprocates in the cylinder body along the axial direction, and the resistance of the piston in the cylinder body is tested; adjusting the test piston until a preset resistance range is met; measuring the sealing leakage rate inside the cylinder body; adjusting the test piston until the sealing leakage rate is met; assembling a piston in a cylinder;

step six, smearing 2-5g of lubricating grease on the thread of the screw rod; butting the commutator with a lead screw; assembling the cylinder body on the pump body bracket, and butting the piston with the lead screw through the commutator; assembling the motor on a motor bracket; butting an output shaft of a motor with a lead screw through a coupler;

Running in the water pump; and wiping lubricating grease after running in, and smearing 2-5g of lubricating grease on the thread of the lead screw again to finish assembly.

In the assembling method of the long-life high-sealing water pump, in the first step, the levelness of the external mounting platform is better than 0.05 mm/m.

In the assembling method of the long-life high-sealing water pump, in the second step, the coaxiality of the second through hole, the first through hole and the third through hole is less than or equal to 0.02 mm.

in the assembly method of the long-life high-sealing water pump, in the third step, the bearing and the bearing support seat are in clearance fit; the clearance between the bearing and the bearing support seat is 3-6 μm; the lead screw is in clearance fit with the bearing; the clearance between the screw rod and the bearing is 2-5 μm.

in the above assembling method of the long-life high-sealing water pump, in the fourth step, a weight is suspended at one end of the screw rod; and rotating the lead screw; the primary loading moment is 0.5 Nm; loading the bearing at 0.25Nm moment each time one by one, and measuring the starting moment of the bearing under different loading moments; and until the nonlinear increase condition occurs, the moment after the last loading is the pre-tightening moment of the bearing.

In the above method for assembling a long-life high-sealing water pump, in the fifth step, the method for testing the resistance and adjusting the test piston includes:

s1, arranging an L-shaped supporting seat; the cylinder body is axially and horizontally fixedly arranged at the top end of the L-shaped supporting seat; butting the adapter piece with the axial outer end of the piston; a digital push-pull dynamometer is adopted to be in butt joint with the adaptor; the piston reciprocates in the cylinder body along the axial direction; measuring the resistance of the piston in real time through a digital push-pull dynamometer;

s2: the resistance f value measured by the digital push-pull dynamometer is judged,

When f is more than or equal to 75N and less than or equal to 125N, finishing the adjustment;

when f is less than 75N, replacing the piston with large outer diameter;

when f is larger than 125N, the piston with small outer diameter is replaced; until f is more than or equal to 75N and less than or equal to 125N.

In the above method for assembling a long-life high-sealing water pump, in the fifth step, the method for testing the sealing leakage rate and adjusting the test piston includes:

the preset sealing leakage rate is not more than 10^-6Pa.m³s; measuring the sealing leakage rate inside the cylinder body by adopting a helium plain leakage detection method, and when the sealing leakage rate is more than 10^-6Pa.m³And when the pressure exceeds the set pressure, the piston with the large outer diameter is replaced until the requirements are met.

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

(1) According to the characteristics of the water pump, the invention innovatively designs the assembly and measurement process flow, optimizes the assembly process, reasonably screens and matches the matched sizes of parts before assembly, increases the digital measurement process method, ensures the reliability of the assembly process method, and completes high-quality assembly in shorter development time

(2) The invention provides a precision assembly method for a long-life high-sealing water pump, a set of precision assembly process is designed, the difficulty in assembly and debugging is effectively reduced by decomposing indexes to parts and components, the assembly is reasonable and feasible, and the component scrapping caused by unmatched assembly is prevented. The pump assembly piston assembly method solves the problems of piston part motion clamping stagnation, large radial run-out, short service life of a water pump, excessive sealing leakage rate and the like through continuous innovation and multiple search attempts, shortens the development period, and can meet the requirements of models and markets;

(3) The invention designs a digital measuring system for the axial push-pull force of the piston component, and can realize the detection of the motion state of the piston in the whole process; the jumping precision of the screw is transferred to the input circumferential surface of the screw to be detected and measured by adopting a process reference conversion method, so that the difficulty in checking the motion stability of the screw is solved; a multi-time lubrication scheme is designed, the lead screws are ensured to run in a relatively safe and reliable lubrication environment, and the development success rate is improved; whether the running state of the screw rod is good or not is judged through non-contact noise detection, the installation state of the water pump is effectively guaranteed to be safe and reliable, digital detection in the assembling process is achieved, the performance level of the assembled water pump is effectively monitored, the water pump with the out-of-tolerance is repaired and reassembled in time, production with problems of the water pump is avoided, meanwhile, the measuring precision of the water pump is effectively improved through an innovative method, and long-term, stable and reliable running of the water pump is guaranteed.

drawings

FIG. 1 is a schematic structural diagram of a high-sealing water pump according to the present invention;

FIG. 2 is a schematic view of the pump body mount and motor mount assembly of the present invention;

FIG. 3 is a schematic diagram of the resistance test of the present invention.

Detailed Description

The invention is described in further detail below with reference to the following figures and specific examples:

the invention relates to an assembly process technology which mainly comprises the technologies of assembly flow optimization design, digital measurement, performance test method optimization, resistance reduction and wear reduction and the like.

A long-life high-sealing water pump comprises a pump body support 1, a motor support 2, a motor 3, a coupler 4, a lead screw 5, a commutator 6, a piston 7 and a cylinder body 8; wherein, the pump body bracket 1 is butted with the motor bracket 2; the motor 3 is fixedly arranged on the motor bracket 2, and an output shaft of the motor 3 points to the pump body bracket 1; the coupler 4 is arranged in the motor bracket 2, and the coupler 4 is butted with an output shaft of the motor 3; the screw 5 is arranged in the pump body bracket 1, and the screw 5 is coaxially arranged with an output shaft of the motor 3; one axial end of the screw 5 extends into the motor bracket 2 and is butted with an output shaft of the motor 3 through a coupler 4; the commutator 6 is butted with the other axial end of the screw rod 5; the piston 7 is butted with the commutator 6; the cylinder body 8 is a hollow columnar structure; the cylinder 8 is sleeved on the outer wall of the piston 7; the motor 3 drives the screw rod 5 to rotate through the coupler 4; the commutator 6 converts the rotation of the screw 5 into the axial translation movement of the piston 7; the piston 7 is linearly reciprocated inside the cylinder 8 as shown in fig. 1.

A first through hole 21 is formed in the side wall, far away from the pump body support 1, of the motor support 2; the motor 3 is fixedly arranged in the first through hole 21, and the motor 3 is limited and fixed through the first through hole 21; a second through hole 11 is formed in the side wall, away from the motor support 2, of the pump body support 1; the cylinder 8 is mounted in the second through hole 11; the cylinder body 8 is limited and fixed through the second through hole 11; a third through hole 22 is formed at the butt joint of the motor bracket 2 and the pump body bracket 1; the third through hole 22 axially penetrates through the motor bracket 2 and the pump body bracket 1; the lead screw 5 extends into the motor support 2 from the pump body support 1. The water pump also comprises a bearing supporting seat and a bearing; wherein, the bearing support seat is arranged on the inner wall of the third through hole 22; the bearing is arranged on the inner wall of the bearing support seat; the spindle 5 passes axially through the bearing.

the assembly method of the long-life high-sealing water pump mainly comprises the following steps:

Step one, adjusting an external installation platform; horizontally placing the external mounting platform; the levelness of the external mounting platform is better than 0.05 mm/m.

Step two, the adjusted external mounting platform is in a horizontal state; placing the side wall of the pump body bracket 1 provided with the second through hole 11 on the upper surface of the external mounting platform; then the motor bracket 2 is installed from top to bottom in the vertical direction, the motor bracket 2 is placed at the top of the pump body bracket 1, and the side wall of the motor bracket 2, which is provided with the first through hole 21, is positioned at the top end of the motor bracket 2; the coaxiality of the second through hole 11, the first through hole 21 and the third through hole 22 is required to be ensured to be less than or equal to 0.02mm, as shown in fig. 2. The method for measuring the coaxiality comprises the following steps: the coaxiality of the first through hole 21 and the third through hole 22 is tested after the pump body support 1 and the motor support 2 are assembled, the lower end face of the pump body support is used as a measuring reference surface, points are respectively collected on the circumferences of the first through hole 21 and the third through hole 22 and are fitted into a circle, the formed circle center is projected on the reference surface of the lower end of the pump body support to be projected, and the distance between the projection points of the first through hole 21 and the third through hole 22 is calculated and used as the coaxiality of the first through hole 21 and the third through hole 22. After the coaxiality requirement is met, the pump body bracket 1 and the motor bracket 2 are fixedly connected by screwing down the connecting screw;

Step three, horizontally placing the pump body bracket 1 and the motor bracket 2; the lead screw 5 is an important component of a transmission mechanism shaft system, and a bearing support seat and a bearing are arranged in the third through hole 22; a lead screw 5 is arranged in the bearing; the bearing and the bearing support seat are in clearance fit; the clearance between the bearing and the bearing support seat is 3-6 μm; the lead screw 5 is in clearance fit with the bearing; the clearance between the screw 5 and the bearing is 2-5 μm. And the outer circle of the lead screw 5 and the inner hole of the bearing support seat are processed according to the size of the inner hole of the bearing, the size of the outer circle and the corresponding fit clearance, and the lead screw and the bearing support seat are assembled in a fit manner according to the size of the bearing during assembly.

step four, testing the pre-tightening torque of the bearing by adopting a weight loading method; pre-tightening the bearing according to the torque obtained by the test; hanging weights at one end of the lead screw 5; and rotating the lead screw 5; the primary loading moment is 0.5 Nm; loading the bearing at 0.25Nm moment each time one by one, and measuring the starting moment of the bearing under different loading moments; and forming a corresponding relation of the starting torque under different tightening torques according to the test result, and if nonlinear increase occurs, taking the previous tightening torque as the standard.

And step five, the piston is an execution component for realizing liquid circulation of the water pump, and the service life of the water pump and the flow fluctuation of the output liquid are determined by the motion resistance and the process stability of the piston. The piston resistance is tested by adopting a push-pull force detection system, and the push-pull force detection system comprises a supporting seat, an adapter and a push-pull force tester. As shown in fig. 3, the piston 7 is reciprocated in the cylinder 8 in the axial direction, and the resistance of the piston 7 moving in the cylinder 8 is tested; adjusting the test piston 7 until a preset resistance range is met; the method for testing the resistance and adjusting the test piston 7 comprises the following steps: firstly, arranging an L-shaped supporting seat 9; the cylinder body 8 is axially and horizontally fixed on the top end of an L-shaped supporting seat 9; butting the adaptor 10 with the axial outer end of the piston 7; a digital push-pull force meter 13 is adopted to be in butt joint with the adaptor 10; the piston 7 reciprocates in the cylinder 8 in the axial direction; the resistance of the piston 7 is measured in real time through a digital push-pull dynamometer 13; the resistance f value measured by the digital push-pull dynamometer 13 is judged,

When f is more than or equal to 75N and less than or equal to 125N, finishing the adjustment;

When f is less than 75N, the piston 7 with large outer diameter is replaced;

When f is larger than 125N, the piston 7 with small outer diameter is replaced; until f is more than or equal to 75N and less than or equal to 125N.

measuring the sealing leakage rate inside the cylinder body; adjusting the test piston 7 until the sealing leakage rate is met; the piston 7 is assembled in the cylinder 8; the method for testing the sealing leakage rate and adjusting the test piston 7 comprises the following steps: the preset sealing leakage rate is not more than 10^{- 6}Pa.m³s; measuring the sealing leakage rate inside the cylinder body 8 by adopting a helium plain leakage detection method, and when the sealing leakage rate is more than 10^{- 6}Pa.m³And when the pressure exceeds the second preset value, the piston 7 with the large outer diameter is replaced until the requirements are met.

Step six, smearing 2-5g of lubricating grease on the thread of the screw rod 5; butting a commutator 6 with a lead screw 5; assembling a cylinder body 8 on the pump body bracket 1, and butting a piston 7 with a lead screw 5 through a commutator 6; assembling the motor 3 on the motor bracket 2; an output shaft of the motor 3 is butted with a lead screw 5 through a coupler 4;

Running in the water pump; and wiping off the lubricating grease after running in, and smearing 2-5g of lubricating grease on the thread of the lead screw 5 again to finish the assembly.

those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.