阅读说明：本技术 一种涡轮泵转速测量结构 (Structure is measured to turbopump rotational speed ) 是由 付瑜 叶树波 白东安 安莎 董飞扬 尉星航 于 2021-08-24 设计创作，主要内容包括：本发明具体涉及一种涡轮泵转速测量结构,解决了现有技术转速传感器输出电压及信号幅值低,导致转速测量不准确,无法准确实时获得发动机涡轮泵工作转速的问题。本发明的一种涡轮泵转速测量结构,包括涡轮转子、第一轴套、调整垫、转速传感器、密封垫、涡轮泵壳体、第二轴套、测速齿组件；转速传感器设置在涡轮泵壳体上,转速传感器与涡轮泵壳体之间设置有密封垫；测速齿组件套在涡轮转子的侧面并与转速传感器位置对应且具有间隙,测速齿组件通过第一轴套和第二轴套固定在涡轮转子上,测速齿组件随涡轮转子一起转动,第一轴套与测速齿组件之间还设置有调整垫。本发明的输出波形杂波少,幅值高,转速传感器输出电压及信号强。(The invention particularly relates to a structure for measuring the rotating speed of a turbine pump, which solves the problems that the rotating speed measurement is inaccurate and the working rotating speed of the turbine pump of an engine cannot be accurately obtained in real time due to low output voltage and signal amplitude of a rotating speed sensor in the prior art. The invention discloses a structure for measuring the rotating speed of a turbine pump, which comprises a turbine rotor, a first shaft sleeve, an adjusting pad, a rotating speed sensor, a sealing pad, a turbine pump shell, a second shaft sleeve and a speed measuring tooth assembly, wherein the first shaft sleeve is arranged on the turbine rotor; the rotating speed sensor is arranged on the turbine pump shell, and a sealing gasket is arranged between the rotating speed sensor and the turbine pump shell; the speed measuring tooth assembly is sleeved on the side face of the turbine rotor, corresponds to the position of the rotating speed sensor and is provided with a gap, the speed measuring tooth assembly is fixed on the turbine rotor through the first shaft sleeve and the second shaft sleeve, the speed measuring tooth assembly rotates along with the turbine rotor, and an adjusting pad is further arranged between the first shaft sleeve and the speed measuring tooth assembly. The output waveform of the invention has less clutter, high amplitude and strong output voltage and signal of the rotating speed sensor.)

1. A structure is measured to turbopump rotational speed which characterized in that: the device comprises a turbine rotor (1), a first shaft sleeve (2), an adjusting pad (3), a rotating speed sensor (4), a sealing pad (5), a turbine pump shell (6), a second shaft sleeve (7) and a speed measuring tooth assembly (8);

the rotating speed sensor (4) is connected to the turbine pump shell (6), propellant is not arranged at the connecting position of the rotating speed sensor (4), and the sealing gasket (5) is arranged between the rotating speed sensor (4) and the turbine pump shell (6);

the speed measuring tooth assembly (8) is sleeved on the side face of the turbine rotor (1), the speed measuring tooth assembly (8) is fixed on the turbine rotor (1) through the first shaft sleeve (2) and the second shaft sleeve (7), and the adjusting pad (3) is arranged between the first shaft sleeve (2) and the speed measuring tooth assembly (8);

the rotating surface of the speed measuring tooth component (8) corresponds to the central line of the rotating speed sensor (4) and is positioned on the same plane, and a gap L3 is formed between the speed measuring tooth component (8) and the rotating speed sensor (4);

the speed measuring tooth assembly (8) comprises a speed measuring tooth (81) and a magnetic rod (82), and the speed measuring tooth (81) is annular;

a plurality of symmetrical teeth (811) and two process teeth (812) are arranged on the outer side of the speed measuring tooth (81);

the even number of the symmetrical teeth (811) are arranged on the circular outer edge of the speed measuring tooth (81) in pairs and located at the same radial position, and the two process teeth (812) are arranged on the circular outer edge of the speed measuring tooth (81) and located at the same radial position;

the symmetrical teeth (811) are all provided with magnetic bars (82).

2. A turbo pump rotation speed measuring structure according to claim 1, wherein: the number of the symmetrical teeth (811) is two.

3. A turbo pump rotation speed measuring structure according to claim 2, wherein: the symmetrical teeth (811) are provided with a diameter ofThe blind hole points to the circle center of the speed measuring tooth (81), and the blind hole is internally provided with a blind hole with the outer diameter ofThe magnetic rod (82) of (a),

4. a turbo pump rotation speed measuring structure according to claim 3, wherein: the N pole or the S pole of the magnetic rod (82) arranged in the blind hole is consistent to the central direction of the speed measuring tooth (81).

5. A turbo pump rotation speed measuring structure according to claim 3, wherein: the symmetrical teeth (811) are also provided with a diameter ofThe technical air holes are positioned at the bottom of the blind holes and penetrate through the speed measuring teeth (81), the technical air holes point to the direction of the circle center of the speed measuring teeth (81),

6. a turbo pump rotation speed measuring structure according to claim 3, wherein: the number of the symmetrical teeth (811) is 4, 6 or 8.

7. A turbo pump rotation speed measuring structure according to claim 3, wherein: the length of the blind hole is L2, the length of the magnetic rod (82) is L1, and the length of 1mm ≦ L2-L1 ≦ 4mm during processing.

8. A turbo pump rotation speed measuring structure according to claim 1, wherein: the range of L3 is 0.5mm < L3 < 3 mm.

9. A turbo pump rotation speed measuring structure according to claim 3, wherein: the orifice of the blind hole is a contracted orifice formed by extruding a steel ball, and the caliber of the contracted orifice is smaller than that of the orifice

Technical Field

The invention relates to an engine rotating speed measuring device, in particular to a structure for measuring the rotating speed of a turbopump.

Background

The rotating speed of the turbopump of the liquid rocket engine is an important parameter for representing the performance of the engine, and the accurate measurement and real-time acquisition of the rotating speed of the turbopump have important significance for analyzing the working conditions of the turbopump and the engine.

The structure for measuring the rotating speed of the turbopump of the liquid rocket engine is generally arranged on a turbine pump shell or an inlet pipe and a rotor shaft, and the structure for measuring the rotating speed of the turbopump is typically as follows: the rotating speed sensor is installed on an inlet pipe of the turbine pump through threaded connection and sealed through a sealing gasket. The magnetic rod is installed in the cylindrical hole in the top end of the shaft end screw, the screw cap is assembled with the shaft end screw through threads to form a shaft end screw assembly, and the shaft end screw assembly prevents the magnetic rod from being thrown out in the rotating process. The shaft end screw assembly is connected with the turbine rotor through threads and is locked through a locking plate to prevent the shaft end screw assembly from loosening in rotation. When the turbine pump works, the turbine rotor drives the shaft end screw assembly to rotate together, the coil cutting magnetic bar in the rotating speed sensor rotates to form a magnetic induction line output signal waveform, and the waveform is identified and converted into a rotating speed signal by the measuring terminal to be output and displayed.

When the structure is applied to the measurement of the rotating speed of the turbine pump, two problems exist; firstly, the radial distance between the rotation speed sensor and the shaft end screw assembly is limited by the radius of the inlet pipe, the general distance is limited by about 10-80 mm due to the structure limitation of the turbo pump, and the distance causes the output voltage and the signal amplitude of the rotation speed sensor to be not large and is only about 70 mV; and secondly, when the magnetic rod works in the low-temperature propellant such as liquid oxygen, liquid hydrogen and liquid methane, the low-temperature environment has interference and attenuation effects on the measurement of the rotating speed signal, clutter interference is large, the output voltage and the signal amplitude of the rotating speed sensor are low and are only about 20mV, the rotating speed measurement is inaccurate, when the output waveform amplitude of the rotating speed sensor is lower than the clutter amplitude, the rotating speed cannot be normally measured, and the working rotating speed of the engine turbo pump cannot be accurately obtained in real time.

Disclosure of Invention

The invention provides a wheel pump rotating speed measuring structure, which aims to solve the problems that rotating speed measurement is inaccurate and the working rotating speed of an engine turbine pump cannot be accurately obtained in real time due to low rotating speed measurement output voltage and signal amplitude in the prior art.

The technical solution of the invention is as follows:

a structure for measuring the rotating speed of a turbine pump is characterized in that: the device comprises a turbine rotor, a first shaft sleeve, an adjusting pad, a rotating speed sensor, a sealing pad, a turbine pump shell, a second shaft sleeve and a speed measuring tooth assembly;

the rotating speed sensor is connected to the turbine pump shell, propellant is not arranged at the connecting position of the rotating speed sensor, and the sealing gasket is arranged between the rotating speed sensor and the turbine pump shell;

the speed measuring tooth assembly is sleeved on the side face of the turbine rotor and fixed on the turbine rotor through the first shaft sleeve and the second shaft sleeve, and the adjusting pad is arranged between the first shaft sleeve and the speed measuring tooth assembly;

the rotating surface of the speed measuring tooth component corresponds to the central line of the rotating speed sensor and is positioned on the same plane, and a gap L3 is formed between the speed measuring tooth component and the rotating speed sensor;

the speed measuring tooth assembly comprises a speed measuring tooth and a magnetic rod, and the speed measuring tooth is annular;

a plurality of symmetrical teeth and two process teeth are arranged on the outer side of the speed measuring tooth;

the plurality of symmetrical teeth are even, are arranged on the circular outer edge of the speed measuring tooth in pairs and are positioned at the same radial position, and the two process teeth are arranged on the circular outer edge of the speed measuring tooth and are positioned at the same radial position;

and magnetic bars are arranged in the symmetrical teeth.

Further, the number of the symmetrical teeth is two.

Further, the symmetrical teeth are provided with a diameter ofThe blind hole points to the circle center of the speed measuring tooth, and the blind hole is internally provided with a blind hole with the outer diameter ofThe magnetic rod(s) of (a),

further, the N pole or the S pole of the magnetic rod arranged in the blind hole is consistently towards the center direction of the speed measuring tooth.

Further, the symmetrical teeth are also provided with a diameter ofThe process air holes are positioned at the bottom of the blind holes and penetrate through the speed measuring teeth, the process air holes point to the circle center direction of the speed measuring teeth,

further, the number of symmetrical teeth is 4, 6 or 8.

Furthermore, the length of the blind hole is L2, the length of the magnetic rod is L1, and the processing needs to ensure that the length of the blind hole is less than or equal to L2-L1 is less than or equal to 4 mm.

Further, the range of L3 is 0.5mm ≦ L3 ≦ 3 mm.

Furthermore, the orifice of the blind hole is a contraction-shaped orifice formed by extruding a steel ball, and the caliber of the contraction-shaped orifice is smaller than that of the contraction-shaped orifice

The invention has the following advantages:

(1) according to the invention, the rotating speed sensor is arranged at the position without the propellant on the shell of the turbine pump, and the rotating speed sensor does not have the interference and attenuation effects of the propellant on a magnetic field when working, so that the output waveform of the rotating speed sensor has less clutter and high amplitude, and the output voltage and signals of the rotating speed sensor are strong;

(2) in the invention, the magnetic bar is arranged at the excircle of the speed measuring tooth, and the distance between the end surface of the magnetic bar and the end surface of the rotating speed sensor is small, usually set to be 0.5 mm-3 mm. Therefore, the distance between the two is obviously reduced, and the output voltage and signals of the rotating speed sensor are greatly increased;

(3) after the magnetic rod is arranged in the blind hole of the speed measuring gear, the hole opening of the blind hole is mechanically compressed, so that the diameter of the hole opening of the blind hole is smaller than that of the magnetic rod, and finally, the magnetic rod can rotate at a high speed without being protected by a nut, and is not worried about being thrown out, simple in structure and high in reliability.

(4) The adjusting pad is arranged in the invention, and can adjust the rotating surface of the speed measuring tooth assembly to keep corresponding to the central line of the rotating speed sensor, thereby ensuring that the speed measuring tooth assembly and the rotating speed sensor are axially positioned on the same plane.

(5) The two process teeth are arranged on the outer side of the speed measuring tooth, and the process teeth can prevent the speed measuring tooth component from working abnormally due to overlarge dynamic unbalance in the rotating process of the turbine rotor.

Drawings

FIG. 1 is a schematic view of a structure for measuring the rotational speed of a turbo pump according to the present invention;

FIG. 2 is a schematic structural view of a speed measuring tooth assembly in a structure for measuring the rotational speed of a turbo pump according to the present invention;

FIG. 3 is a schematic diagram of a structure of a speed measuring tooth in the structure for measuring the rotational speed of a turbo pump according to the present invention;

FIG. 4 is a schematic view of a magnetic rod installation closing-in a structure for measuring the rotational speed of a turbo pump according to the present invention;

FIG. 5 is a waveform diagram of the original signal of the measured rotation speed in the practical application of the present invention.

1. The speed measuring device comprises a turbine rotor, 2 parts of a first shaft sleeve, 3 parts of an adjusting pad, 4 parts of a rotating speed sensor, 5 parts of a sealing gasket, 6 parts of a turbine pump shell, 7 parts of a second shaft sleeve, 8 parts of a speed measuring tooth component, 81 parts of a speed measuring tooth, 811 parts of symmetrical teeth, 812 parts of process teeth and 82 parts of magnetic rods.

Detailed Description

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

As shown in fig. 1, the present invention provides a structure for measuring a rotational speed of a turbo pump,

the structure mainly comprises a turbine rotor 1, a first shaft sleeve 2, an adjusting pad 3, a rotating speed sensor 4, a sealing pad 5, a turbine pump shell 6, a second shaft sleeve 7 and a speed measuring tooth assembly 8, wherein the speed measuring tooth assembly 8 comprises speed measuring teeth 81 and a magnetic rod 82.

The rotation speed sensor 4 is screwed to the propellant-free turbo pump housing 6 and is sealed by a sealing gasket 5.

The speed measuring tooth assembly 8 is sleeved on the turbine rotor 1 and corresponds to the position of the rotating speed sensor 4, and the speed measuring tooth assembly 8 is tightly pressed on the turbine rotor 1 through the first shaft sleeve 2 and the second shaft sleeve 7 and rotates along with the turbine rotor 1. An adjusting pad 3 is further arranged between the first shaft sleeve 2 and the speed measuring tooth assembly 8, the rotating surface of the speed measuring tooth assembly 8 is adjusted to correspond to the central line of the rotating speed sensor 4 through the adjusting pad 3, and the two rotating surfaces are guaranteed to be located on the same plane in the axial direction.

When the speed measuring gear component 8 rotates, the propellant, especially the low-temperature propellant, is not present at the position of the rotating speed sensor 4, so that the magnetic field generated by the propellant does not interfere and attenuate, the waveform clutter output by the rotating speed sensor 4 is less, the amplitude is high, and the output voltage and the signal of the rotating speed sensor 4 are strong.

The low-temperature propellant refers to liquid oxygen, liquid hydrogen and liquid methane.

The clearance between the outer circle of the speed measuring tooth component 8 and the end face of the rotating speed sensor 4 is defined as L3, and the range of L3 is 0.5 mm-3 mm. The gap L3 between the end face of the rotating speed sensor 4 and the excircle of the speed measuring tooth component 8 is adjusted by adjusting the thickness of the sealing gasket 5, and in principle, the smaller the L3 is, the better the gap is, so that the strongest magnetic field is formed in the rotation of the sensing magnetic rod of the rotating speed sensor, and the stronger the rotating speed waveform and the signal output by the rotating speed sensor are.

As shown in figures 2 and 3 of the drawings,

the tacho gear assembly 8 comprises a tacho gear 81 and a magnetic bar 82.

The speed measuring teeth 81 are made of nonmagnetic materials, the speed measuring teeth 81 are in a ring shape, and two symmetrical teeth 811 and two process teeth 812 are arranged on the outer side of the ring

Two symmetrical teeth 811 are on the same diameter and the rotating surface thereof corresponds to the revolution speed sensor 4, and one diameter of each of the two symmetrical teeth 811 isThe blind hole points to the center of the speed measuring teeth 81 and is used for installing the magnetic rod 82. As the magnetic bar 82 is fragile, the diameter of the blind hole is ensured during processingIs larger than the outer diameter of the magnetic rod 82So that the blind holes form a gap with the magnetic rod 82 for easy installation. However, when the gap is too large, the magnetic rod 82 may shake during the rotation process, which results in unstable measurement of the rotation speed signal, and therefore, the gap between the blind hole and the magnetic rod 82 needs to be ensured to be between 0.02mm and 0.1 mm.

The two process teeth 812 are respectively arranged at two ends of a bisector of a connecting line of the two symmetrical teeth 811, the two process teeth 812 are used for dynamic balance of the whole speed measuring tooth assembly 8 after the magnetic rod 82 is installed, materials are reduced on the process teeth 812 to meet the dynamic balance requirement of the speed measuring tooth assembly 8, and abnormal operation of the shafting instability turbine pump caused by overlarge dynamic unbalance in the process that the speed measuring tooth assembly 8 rotates along with the turbine rotor 1 is prevented.

When the two magnetic rods 82 are installed, the polarities are consistent, that is, the N poles or S poles of the two magnetic rods are consistent and face the central direction of the speed measuring teeth 81, so as to ensure that the measured waveforms are consistent.

Each symmetrical tooth 811 is machined to a diameter ofThe process air holes prevent the magnetic rod 82 from being completely placed in the blind hole due to the fact that when the magnetic rod 82 is installed, a closed space is formed between the small gap and the bottom of the blind hole. The process air holes are positioned at the bottom of the blind holes and penetrate through the speed measuring teeth 81, the process air holes point to the circle center of the speed measuring teeth 81, and the diameter of the process air holesIs required to be smaller than the outer diameter of the magnetic rod 82The size is more than 1mm, so that the magnetic rod 82 is ensured not to be installedCan fall off.

The number of the symmetrical teeth 811 can also be symmetrically increased to be 4, 6, 8 and even numbers larger than 8, so that the rotation speed signal waveform can be continuously identified.

As shown in figure 4 of the drawings,

diameter of the blind hole isThe magnetic rod 82 has an outer diameter of

The length of the blind hole machined on the symmetrical tooth 811 is defined as L2, the length of the magnetic rod 82 is defined as L1, and the L2 is required to be larger than the L1 for 1 mm-4 mm during machining. After the magnetic bar 82 is installed in the blind hole, the steel ball presses the excircle of the symmetrical tooth 811 blind hole, and the orifice of the blind hole deforms and contracts under huge pressure, so that the aperture of the orifice of the compressed blind hole is smaller than that of the orifice of the blind holeThereby fixing the magnetic rod in the hole and preventing the magnetic rod from being thrown out when rotating.

The original waveform of the rotation speed signal output by the embodiment is shown in fig. 5, the amplitude can reach about 1700mV, the amplitude is greatly increased compared with 70mV measured by the previous rotation speed measurement structure, the anti-interference capability is strong, and the waveform is stable and meets the use requirement.