CN112523900B - Device for measuring axial force of turbine pump - Google Patents
Device for measuring axial force of turbine pump Download PDFInfo
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- CN112523900B CN112523900B CN202011382016.5A CN202011382016A CN112523900B CN 112523900 B CN112523900 B CN 112523900B CN 202011382016 A CN202011382016 A CN 202011382016A CN 112523900 B CN112523900 B CN 112523900B
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- displacement sensor
- shaft
- axial force
- displacement
- turbine pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/96—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof characterised by specially adapted arrangements for testing or measuring
Abstract
The invention relates to a device for measuring the axial force of a turbine pump, which comprises a turbine pump shaft, a shaft end sealing piece, a shaft end nut, a first nut, a displacement sensor, an adjusting gasket, a displacement sensor bracket and a pump shell, wherein the shaft end sealing piece is fixedly connected to one end of the turbine pump shaft through the shaft end nut to prevent a medium in the pump shell from leaking; the displacement sensor and the adjusting gasket are connected with one end of the displacement sensor support through a first nut, the other end of the displacement sensor support is connected with the pump shell, and the initial distance between the displacement sensor and the measuring surface is adjusted through the adjusting gasket; axial forces pointing to two ends of the shaft are respectively applied to the turbine pump shaft, the turbine pump shaft moves, displacement data are obtained through the displacement sensor, and a relational expression of the axial forces and shaft displacement is established. The sensor is arranged at the shaft end, the shaft system layout of other positions is not influenced, the axial force of the turbine pump in the working state is directly measured, conversion is not needed, and the result is accurate.
Description
Technical Field
The invention relates to a device for measuring axial force of a turbine pump, and belongs to the technical field of engine control.
Background
The liquid rocket engine turbopump has high rotating speed, large lift and large axial force of a rotor system, and the axial force is completely borne by the bearing, so that the bearing is easily damaged, and the turbopump is easy to break down. In order to ensure the normal work of the turbo pump, the axial force of the turbo pump needs to be accurately adjusted, but the axial force of the turbo pump is influenced by a plurality of factors, the unbalanced axial force of the turbo pump, the manufacturing deviation of products and the adjustment deviation of a system can be gradually increased along with the increase of the size and the working pressure, and when an engine is in a variable working condition, is started and is shut down, great axial force impact is generated in the turbo pump.
In the high-thrust liquid rocket engine turbine pump, the problems are more prominent, and the reliability and reliability of the axial force directly determine the working reliability of the turbine pump, wherein the accurate measurement of the axial force is the key for solving the problems.
Because a special axial force sensor needs to be arranged on the outer ring of the thrust bearing, the required installation space is large, the axial rigidity of the bearing can be reduced, and the compact structural layout of the turbine pump cannot meet the requirement generally.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects in the prior art are overcome, the device for measuring the axial force of the turbine pump is provided, and the axial force of the turbine pump is measured in real time when the engine works.
The technical scheme of the invention is as follows:
a device for measuring the axial force of a turbine pump comprises a turbine pump shaft, a shaft end sealing element, a shaft end nut, a first nut, a displacement sensor, an adjusting gasket, a displacement sensor bracket and a pump shell,
the shaft end sealing piece is fixedly connected to one end of the turbine pump shaft through a shaft end nut to prevent a medium in the pump shell from leaking;
the displacement sensor and the adjusting gasket are connected with one end of the displacement sensor support through a first nut, the other end of the displacement sensor support is connected with the pump shell, and the initial distance between the displacement sensor and the measuring surface is adjusted through the adjusting gasket;
axial forces pointing to two ends of the shaft are respectively applied to the turbine pump shaft, the turbine pump shaft moves, displacement data are obtained through a displacement sensor, and a relational expression of the axial forces and shaft displacement is established;
and when the engine is tested, the real axial force borne by the shaft is determined according to the displacement data acquired by the displacement sensor through the relational expression of the axial force and the shaft displacement.
Furthermore, a circle of measuring surface is arranged on the shaft end nut, and the moving sensor probe is located in the envelope range of the measuring surface, so that the reliable work of the displacement sensor during work is ensured.
Furthermore, the distance between the displacement sensor and the measuring surface is adjusted through the adjusting pad.
Furthermore, the outer diameter of the measuring surface of the shaft end nut is larger than the sum of the diameter of the mounting distribution circle of the displacement sensor and the diameter of the displacement sensor probe.
Further, the distance between the displacement sensor and the measuring surface is a measuring rated value of the displacement sensor.
Furthermore, the test rated value of the displacement sensor is 1mm-3 mm.
Further, the axial force is not more than 30kN, starting from 0 and recorded every 5 kN.
Further, when the axial force is 30kN, if the displacement changes by 0.1-0.14mm, the quality of the shafting can be judged to be qualified.
Compared with the prior art, the invention has the beneficial effects that:
(1) the displacement sensor and the adjusting gasket are connected with one end of a displacement sensor support through a first nut, the other end of the displacement sensor support is connected with a pump shell, and the initial distance between the displacement sensor and a measuring surface is adjusted through the adjusting gasket; the sensor is arranged at the shaft end, the shaft system layout of other positions is not influenced, the axial force of the turbine pump in a working state is directly measured, conversion is not needed, and the result is accurate;
(2) axial forces pointing to two ends of a shaft are respectively applied to a turbine pump shaft, the turbine pump shaft moves, displacement data are obtained through a displacement sensor, and a relational expression of the axial forces and shaft displacement is established; when the engine is tested, the real axial force borne by the shaft is determined according to the displacement data acquired by the displacement sensor through the relational expression of the axial force and the shaft displacement; the change rule of the axial force of the turbine pump can be obtained in the dynamic processes of starting, shutting down and the like.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
The invention is further illustrated by the following examples.
A device for measuring the axial force of a turbine pump is shown in figure 1 and comprises a turbine pump shaft 1, a shaft end sealing element 2, a shaft end nut 3, a first nut 4, a displacement sensor 5, an adjusting gasket 6, a displacement sensor bracket 7 and a pump shell 9,
the shaft end sealing piece 2 is fixedly connected to one end of the turbine pump shaft 1 through a shaft end nut 3 to prevent a medium in a pump shell 9 from leaking;
the displacement sensor 5 and the adjusting gasket 6 are connected with one end of a displacement sensor support 7 through a first nut 4, the other end of the displacement sensor support 7 is connected with a pump shell 9, and the initial distance between the displacement sensor 5 and the measuring surface is adjusted through the adjusting gasket 6; the distance of the displacement sensor 5 from the measuring surface is adjusted by means of the adjusting pad 6.
Axial forces pointing to two ends of the shaft are respectively applied to the turbine pump shaft 1, the turbine pump shaft 1 moves, displacement data are obtained through the displacement sensor 5, and a relational expression of the axial forces and shaft displacement is established;
and when the engine is tested, the real axial force borne by the shaft is determined according to the displacement data acquired by the displacement sensor 5 through the relational expression of the axial force and the shaft displacement.
The shaft end nut 3 is provided with a circle of measuring surface, and the moving sensor probe is positioned in the envelope range of the measuring surface, so that the reliable work of the displacement sensor 5 is ensured during the work.
The outer diameter of the measuring surface of the shaft end nut 3 is larger than the sum of the diameter of the mounting distribution circle of the displacement sensor and the diameter of the displacement sensor probe, the distance between the displacement sensor and the measuring surface is a measuring rated value of the displacement sensor, and the measuring rated value of the displacement sensor is 1mm-3 mm.
The axial force is not more than 30kN, and is recorded every 5kN from 0; when the axial force is 30kN, if the displacement changes by 0.1-0.14mm, the quality of the shafting can be judged to be qualified.
Examples
(1) After the shaft end sealing element 2 is installed, the shaft end nut 3 with the measuring surface is installed, the outer diameter of the measuring surface is 114mm, the diameter of the installation distribution circle of the displacement sensor is 94mm, and the radius of the probe of the displacement sensor is 9 mm.
(2) The thickness of the adjusting shim 6 is calculated to be 2.5mm, so that the distance between the displacement sensor 5 and the measuring surface after the installation is 2 mm.
(3) The adjusting shim 6 is mounted on the displacement sensor 5 and then connected to the displacement sensor support 7 and tightened by the first nut 4. The displacement sensor holder 7 is fixed to the pump housing 9 and connected thereto by 4 screws 8.
(4) Axial forces in two directions are applied to the turbine pump shaft 1 through a force application device, the maximum axial force is 2000kg, displacement values are recorded every 500kg, and a relation curve of the axial forces and shaft displacement is obtained.
(5) And (4) measuring displacement data during the hot test of the engine, and calculating the axial force borne by the turbine pump reversely according to the displacement data and the relation curve of the axial force and the axial displacement in the step (4).
The invention can install the sensor at the shaft end without influencing the shafting layout of other positions, directly measure the axial force of the turbine pump in the working state, and has accurate result without conversion.
The invention can obtain the change rule of the axial force of the turbine pump during the dynamic processes of starting, shutting down and the like.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (8)
1. A device for measuring the axial force of a turbine pump is characterized by comprising a turbine pump shaft (1), a shaft end sealing element (2), a shaft end nut (3), a first nut (4), a displacement sensor (5), an adjusting gasket (6), a displacement sensor bracket (7) and a pump shell (9),
the shaft end sealing piece (2) is fixedly connected to one end of the turbine pump shaft (1) through a shaft end nut (3) to prevent a medium in the pump shell (9) from leaking;
the displacement sensor (5) and the adjusting gasket (6) are connected with one end of a displacement sensor support (7) through a first nut (4), the other end of the displacement sensor support (7) is connected with a pump shell (9), and the initial distance between the displacement sensor (5) and the measuring surface is adjusted through the adjusting gasket (6);
axial forces pointing to two ends of the shaft are respectively applied to the turbine pump shaft (1), the turbine pump shaft (1) moves, displacement data are obtained through a displacement sensor (5), and a relational expression of the axial forces and shaft displacement is established;
and when the engine is tested, the real axial force borne by the shaft is determined according to the displacement data acquired by the displacement sensor (5) through the relational expression of the axial force and the shaft displacement.
2. The device for measuring the axial force of the turbine pump is characterized in that a circle of measuring surface is arranged on the shaft end nut (3), and the displacement sensor probe is positioned in the envelope range of the measuring surface, so that the displacement sensor (5) can work reliably during work.
3. A device for measuring axial force of a turbo pump according to claim 1, wherein the distance of the displacement sensor (5) from the measuring surface is adjusted by adjusting the spacer (6).
4. The device for measuring the axial force of the turbine pump as claimed in claim 1, wherein the outer diameter of the measuring surface of the shaft end nut (3) is larger than the sum of the diameter of the mounting distribution circle of the displacement sensor and the diameter of the probe of the displacement sensor.
5. The apparatus for measuring axial force of a turbo pump according to claim 1, wherein the distance between the displacement sensor and the measuring surface is a test rated value of the displacement sensor.
6. The apparatus of claim 5, wherein the displacement sensor test rating is 1mm to 3 mm.
7. The apparatus of claim 1, wherein the axial force is not greater than 30kN, and is recorded every 5kN from 0.
8. The device for measuring the axial force of the turbopump according to claim 1, wherein when the axial force is 30kN, if the displacement changes by 0.1-0.14mm, the quality of the shafting can be judged to be qualified.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011382016.5A CN112523900B (en) | 2020-11-30 | 2020-11-30 | Device for measuring axial force of turbine pump |
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| CN202011382016.5A CN112523900B (en) | 2020-11-30 | 2020-11-30 | Device for measuring axial force of turbine pump |
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| CN112523900A CN112523900A (en) | 2021-03-19 |
| CN112523900B true CN112523900B (en) | 2022-03-04 |
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| CN113607335A (en) * | 2021-08-04 | 2021-11-05 | 安徽九州云箭航天技术有限公司 | Test system and test method for verifying reliability of turbine pump balancing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209838554U (en) * | 2019-02-11 | 2019-12-24 | 北京星际荣耀空间科技有限公司 | Axial force balancing device of turbopump of liquid rocket engine |
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| FR2894025B1 (en) * | 2005-11-28 | 2008-02-22 | Hispano Suiza Sa | METHOD AND DEVICE FOR MEASURING HYDRODYNAMIC EFFECTS ON A CENTRIFUGAL PUMP IN OPERATION |
| CN103629121A (en) * | 2013-12-12 | 2014-03-12 | 兰州理工大学 | Dynamic axial force testing device for impeller of centrifugal pump |
| CN104500413B (en) * | 2014-11-21 | 2017-01-11 | 江苏大学 | Measuring unit for measuring axial force of submerged pump |
| CN106248278B (en) * | 2016-07-25 | 2019-01-15 | 宁波威孚天力增压技术有限公司 | A kind of turbocharger axial direction force measuring system and its test method |
| CN107575400A (en) * | 2017-08-28 | 2018-01-12 | 沈阳鼓风机集团申蓝机械有限公司 | A kind of vertical shield pump rotor axial force test device and method of testing |
| CN110967129B (en) * | 2019-12-05 | 2021-11-12 | 中国航发四川燃气涡轮研究院 | High-temperature rotor system axial force testing system and method |
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| CN209838554U (en) * | 2019-02-11 | 2019-12-24 | 北京星际荣耀空间科技有限公司 | Axial force balancing device of turbopump of liquid rocket engine |
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