CN107489609B - Vertical gap flow dynamic characteristic coefficient test device - Google Patents

Abstract

The invention provides a vertical clearance flow dynamic characteristic coefficient test device, which includes a rotation driving device, a vortex driving device, a gap flow circulation pipeline and a measuring device, wherein: the rotation driving device includes a rotation driving motor, a test spindle, a test outer The cylinder, the upper bearing seat and the lower bearing seat, the rotation drive motor drives the rotation of the test spindle; the test spindle connects the upper bearing seat and the lower bearing seat; the test spindle penetrates the test outer cylinder, and a test section gap is formed between the test spindle and the test outer cylinder; test The segment gap is connected to the gap flow circulation pipeline; the measuring device is arranged on the rotation drive device; the whirl drive device includes a whirl drive motor, a revolution shaft and a pulley device, and the whirl drive motor drives the revolution shaft to rotate; the revolution shaft is driven by the pulley to drive the main shaft to generate whirl. The present invention has precise structure, sophisticated design and high data collection accuracy; the present invention can meet the test requirements of different working conditions by adjusting the gear of the eccentric bearing seat to change the eccentricity.

Description

Vertical gap flow dynamic characteristic coefficient test device

technical field

The invention relates to the technical field of pump bodies, in particular to a vertical clearance flow dynamic characteristic coefficient testing device.

Background technique

The canned motor pump has important applications in the national energy and national defense fields. This kind of pump has the advantages of no dynamic seal and low vibration and noise. The canned electric pump is generally composed of a shielded motor and an impeller that are directly connected through the motor shaft. Between the rotor and the stator inside the shielded motor, there is an elongated annular gap in the axial direction, through which cooling water flows, and the cooling water forms a gap flow for lubricating the bearings and cooling the motor. The gap flow has an important influence on the rotor dynamic characteristics of the canned motor pump. It is of great significance to test the dynamic characteristics coefficient of the gap flow to study its influence on the rotor dynamic characteristics of the canned motor pump.

SUMMARY OF THE INVENTION

In view of the defects in the prior art, the purpose of the present invention is to provide a vertical clearance flow dynamic characteristic coefficient test device.

A vertical gap flow dynamic characteristic coefficient test device provided according to the present invention includes a rotation drive device, a vortex drive device, a gap flow circulation pipeline and a measurement device, wherein:

The self-rotation driving device includes a self-rotation driving motor, a test spindle, a test outer cylinder, an upper bearing seat and a lower bearing seat, and the self-rotation driving motor drives the test spindle to rotate through a coupling; the upper end of the test spindle is connected to the upper bearing seat , the lower end is connected to the lower bearing seat; the test main shaft penetrates the test outer cylinder, and there is a gap between the test main shaft and the test outer cylinder to form a test section gap;

The upper part and the lower part of the gap of the test section are respectively connected to the gap flow circulation pipeline;

the measuring device is arranged on the rotation driving device;

The whirl drive device includes a whirl drive motor, a revolution shaft and a pulley device, the whirl drive motor drives the revolution shaft to rotate; the revolution shaft connects the upper bearing seat and the lower bearing seat through the pulley device, and then drives the test spindle to generate whirl.

Preferably, the measuring device includes an eddy current displacement sensor, a temperature sensor, a tension pressure sensor and a differential pressure sensor, wherein:

The eddy current displacement sensor is arranged on the displacement sensor mounting seat of the test outer cylinder;

The upper and lower parts of the outer test cylinder are provided with a temperature sensor and a differential pressure sensor for measuring the temperature and pressure at the inlet and outlet of the test section gap;

The tension and pressure sensors are respectively arranged on the upper bearing seat and the lower bearing seat, and are used for measuring the acting force of the main shaft on the upper bearing seat and the lower bearing seat.

Preferably, the upper bearing seat and the lower bearing seat are eccentric bearing seats, the middle ring of the bearing seat of the upper bearing seat and the lower bearing seat has an eccentricity relative to the center of the outer ring, and the eccentricity can pass through the upper bearing seat and the lower bearing seat. gear adjustment.

Preferably, the gap flow circulation pipeline includes an inlet pipe section, an outlet pipe section, a circulation pump and a regulating valve, wherein:

The inlet pipe section is connected to the lower part of the gap of the test section; the outlet pipe section is connected to the upper part of the gap of the test section;

the circulation pump drives the flow of fluid in the interstitial flow circulation line;

The regulating valve is used to regulate the flow rate of the fluid in the gap flow circulation pipeline.

Preferably, the pulley device includes double pulleys and two timing belts, the vortex drive motor drives the double pulleys to drive the two timing belts to run, and the two timing belts are respectively connected to the middle rings of the upper bearing seat and the lower bearing seat.

Preferably, the upper bearing seat and the lower bearing seat respectively have at least one tension pressure sensor arranged in the direction of movement of the pulley device, for balancing the seat center of the bearing seat when the pulley device rotates.

Preferably, it also includes a tension pressure sensor mounting seat for installing the tension pressure sensor, the tension pressure sensor mounting seat is in a loose state before the tension pressure sensor is installed, and is in a jacked state after the tension pressure sensor is installed.

Preferably, a plurality of valves are further provided on the gap flow circulation pipeline for adjusting the flow direction of the fluid in the gap flow cycle pipeline.

Compared with the prior art, the present invention has the following beneficial effects:

1. The present invention has precise structure, sophisticated design and high data collection accuracy;

2. The present invention changes the eccentricity by adjusting the gear of the eccentric bearing seat to meet the test requirements of different working conditions;

3. The present invention conducts the clearance flow dynamic coefficient by measuring the real-time axis trajectory of the test spindle, the force magnitude and direction of the spindle under the action of fluid and without fluid, and the pressure difference and temperature of the fluid at the inlet and outlet of the test section gap. specific analysis.

Description of drawings

Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

Fig. 1 is the structural schematic diagram of the vertical clearance flow dynamic characteristic coefficient test device;

Fig. 2 is the sectional view of the rotation drive device of the vertical clearance flow dynamic characteristic coefficient test device;

Fig. 3 is the assembly drawing of the bearing seat of the rotation drive device and the tension pressure sensor;

Fig. 4 is the longitudinal sectional view of the test outer cylinder of the present invention;

Fig. 5 is the structural representation of the test outer cylinder of the present invention;

Fig. 6 is the transverse sectional view of the test outer cylinder of the present invention;

FIG. 7 is a schematic diagram of the comparison of the concentric bearing seat and the eccentric bearing seat of the present invention;

Fig. 8 is the combined schematic diagram of the upper and lower bearing seats of the present invention when they are normal;

FIG. 9 is a schematic cross-sectional view of FIG. 8 in the A-A direction;

Figure 10 is a schematic cross-sectional view of Figure 8 in the B-B direction;

11 is a schematic diagram of the combination of the overall translation of the upper and lower bearing seats of the present invention and the uniform clearance;

Figure 12 is a schematic cross-sectional view of Figure 11 in the A-A direction;

FIG. 13 is a schematic cross-sectional view of FIG. 11 in the direction B-B;

14 is a schematic diagram of the first combination when the eccentricities of the upper and lower bearing seats of the present invention are different and the gap is non-uniform;

FIG. 15 is a schematic cross-sectional view in the A-A direction of FIG. 14;

FIG. 16 is a schematic cross-sectional view of FIG. 14 in the direction B-B;

17 is a schematic diagram of the second combination when the eccentricity of the upper and lower bearing seats of the present invention is different and the gap is uneven;

FIG. 18 is a schematic cross-sectional view of FIG. 17 in the direction A-A;

FIG. 19 is a schematic cross-sectional view of FIG. 17 in the direction B-B;

The figure shows:

Detailed ways

The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. These all belong to the protection scope of the present invention.

As shown in FIG. 1 to FIG. 6 , a vertical gap flow dynamic characteristic coefficient test device provided according to the present invention includes: a rotation driving device, a vortex driving device, a gap flow circulation pipeline and a measuring device, wherein: the rotation The driving device includes an autorotation drive motor, a test spindle, a test outer cylinder 4, an upper bearing seat 2 and a lower bearing seat 1. The autorotation drive motor drives the test spindle to rotate through the drum gear coupling 13; the upper end of the test spindle is connected by a rigid coupling. The shaft is connected to the upper bearing seat 2, and the lower end is connected to the lower bearing seat 1 through a rigid coupling; the upper bearing seat 2 is installed on the dynamic bearing bracket 8; the lower bearing seat 1 is installed on the base 3; the test spindle runs through the test outer cylinder 4, The test outer cylinder 4 is arranged on the test section support 26, and a gap exists between the test main shaft and the test outer cylinder to form a test section gap 32, and the test section gap 32 is a closed space. It should be noted that the upper bearing seat 2 and the lower bearing seat 1 are both eccentric bearing seats, the upper bearing seat 2 and the lower bearing seat 1 are eccentric bearing seats, and the middle ring of the bearing seat of the upper bearing seat 2 and the lower bearing seat 1 There is an eccentricity relative to the center of the outer ring, and the eccentricity can be adjusted by the gears on the upper bearing seat 2 or the lower bearing seat 1 .

Further, the measurement device is arranged on the rotation drive device, and the measurement device includes an eddy current displacement sensor, a temperature sensor, a tension pressure sensor 31 and a differential pressure sensor, wherein: the upper and lower parts of the gap 32 of the test section are provided with eddy currents capable of being inserted. The displacement sensor mounting seat 6 of the displacement sensor, the eddy current displacement sensor is close to the experimental spindle through the displacement sensor mounting seat 6, and the eddy current displacement sensor measures the axis track graph, key phase signal waveform and real-time speed of the test spindle.

In more detail, the test outer cylinder 4 is also provided with a pressure sensor mounting seat 5 for installing a differential pressure sensor, and the differential pressure sensor is used to test the pressure drop of the test section gap 32; the upper and lower parts of the test outer cylinder 4 are also provided with There are temperature sensors for measuring the temperature at the inlet and outlet of the gap 32 of the test section; the upper bearing seat 2 and the lower bearing seat 1 are respectively provided with 4 tension pressure sensors 31, and the tension pressure sensors 31 are installed on the tension pressure sensor mounting seat Above, the tension pressure sensor mounting seat is in a loose state before the tension pressure sensor is installed, and is in a tight state after the tension pressure sensor is installed. The tension pressure sensor 31 is used to measure the force of the test spindle on the upper bearing seat 2 and the lower bearing seat 1 . Among them: three tension pressure sensors 31 are evenly arranged around the upper bearing seat 2 or the lower bearing seat 1, and another tension pressure sensor 31 is arranged according to the transmission direction of the pulley device, which is used to balance the seat of the bearing seat brought by the rotation of the pulley device Heart. Adjust the tension of the tension pressure sensor 31 and the balance of the upper bearing seat 2 or the lower bearing seat 1 by adjusting the bolts and nuts, so as to ensure that the tension pressure sensor 31 is moderately stressed and the upper bearing seat 2 or the lower bearing seat 1 and the test spindle relative position.

The vortex drive device is described below. The vortex drive device includes a vortex drive motor, a revolving shaft and a pulley device, the vortex drive motor is arranged on the top of the vortex drive device, and the vortex drive motor drives the revolving shaft to rotate; the described The revolving shaft connects the upper bearing seat 2 and the lower bearing seat 1 through the pulley device, and then drives the main shaft to generate whirl. The pulley device includes a double pulley 9 and two arc tooth synchronous belts 14. The vortex drive motor drives the double pulley to drive the two arc tooth synchronous belts 14 to run, and the two arc tooth synchronous belts 14 are respectively connected to bearings. The middle ring of seat 2 and lower bearing seat 1.

Further description, the gap flow circulation pipeline includes an inlet and outlet pipeline 21, a circulating pump and a regulating valve, wherein: the inlet pipe section of the inlet and outlet pipeline 21 is connected to the lower part of the gap 32 of the test section; the outlet pipe section of the inlet and outlet pipeline 21 The upper part of the gap 32 of the test section is communicated; the circulation pump drives the flow of the fluid in the gap flow circulation pipeline; the regulating valve is used to adjust the flow rate of the fluid in the gap flow circulation pipeline. The fluid enters the lower part of the test section gap 32 from the inlet section of the outlet pipeline 21 , flows out from the upper part of the test section gap 32 and enters the outlet section of the inlet and outlet pipeline 21 .

More specifically, a plurality of valves are also provided on the gap flow circulation pipeline for adjusting the flow direction and flow rate of the fluid in the gap flow cycle pipeline.

In detail, the rotation driving device and the whirling driving device are fastly connected by the first transition support plate 10 , the second transition support plate 11 and the third transition support plate 12 .

In the present invention, the force of the test spindle on the bearing seat is measured and the force of the test spindle is deduced. From this, the force of the test spindle when there is fluid flowing through the gap and when there is no fluid flow can be inferred, and then the effect of the fluid on the rotor can be obtained. force.

Using the upper bearing seat 2 and the lower bearing seat 1 with the same eccentricity and eccentricity direction, the assembled test spindle produces a uniform position eccentricity along the axial direction relative to the test outer cylinder 4; use the upper bearing seat with different eccentricity or different eccentricity directions 2 and the lower bearing seat 1, the assembled test spindle has a non-uniform position eccentricity relative to the test outer cylinder 4 along the axial direction, so that the force of the test spindle under different eccentricity and inclination states can be obtained.

Under various eccentric positions of the test spindle, adjust the fluid flow, flow direction and test spindle speed in the gap 32 of the test section, and measure the lateral vibration axis trajectory of the test spindle and the axial movement of the test spindle in real time.

Under various experimental conditions, the flow resistance of the fluid in the test section gap 32 under different eccentric positions of the test spindle, different rotational speeds and different flow rates can be obtained by measuring the inlet and outlet pressure difference of the fluid in the test section gap 32 .

By testing the axis trajectory of the spindle at different rotation speeds and whirling speeds and the force of the gap flow on the test spindle, the dynamic characteristic coefficient of the gap flow at this time can be calculated, including stiffness, damping and additional mass, and different tests can be obtained. Influence law of spindle speed on dynamic characteristic coefficient of gap flow.

The axial trajectory of the test spindle under different eccentricities and the force of the gap flow on the test spindle are then calculated, and the dynamic characteristic coefficient of the gap flow is calculated, and the influence law of the eccentricity on the dynamic characteristic coefficient of the gap flow is obtained.

Under different gap flow rates, temperatures and different pre-rotation degrees, by measuring the axial trajectory of the test spindle and the force of the gap flow on the test spindle, the dynamic characteristic coefficient of the gap flow at this time is calculated, and the flow rate, temperature and pre-rotation are obtained. Influence law of curl on dynamic characteristic coefficient of gap flow.

Under different gap widths, by measuring the axial trajectory of the test spindle and the force of the gap flow on the test spindle, and then calculating the gap flow dynamic characteristic coefficient at this time, the influence law of the gap width on the gap flow dynamic characteristic coefficient is obtained.

The present invention is a vertical clearance flow dynamic characteristic coefficient test device, and there is no such test device at home and abroad according to the experimental content.

The present invention controls the flow, temperature and flow direction of the fluid through the gap 32 of the test section; by assembling the bearing seat with position eccentricity, the position of the test spindle is eccentric relative to the test outer cylinder; by adjusting the gear of the eccentric bearing seat, the test spindle is relatively eccentric The test outer cylinder generates different eccentricities along the axial direction according to the experimental requirements; the eddy current displacement sensor assembled on the upper and lower parts of the test outer cylinder is used to measure the real-time axis trajectory of the test spindle; Measure the force size and direction of the test spindle under the action of fluid and without the action of fluid; use the differential pressure sensor installed at the inlet and outlet of the test segment gap 32 to measure the fluid in the test segment gap 32 when the test spindle speed and the test spindle position are eccentric. pressure drop.

The present invention is also provided with a pitot tube 25, the pitot tube 25 is arranged on the upper part of the test section gap 32, and is used for measuring the flow rate of the fluid in the test section gap 32.

As shown in Figure 7, the bearing seat is designed in a concentric form and a position eccentric form, wherein the axis of the inner circular surface of the bearing in the position eccentric form has a positional deviation from the axis of the outer circular surface of the bearing seat, and the position deviation can be customized according to experiments.

As shown in FIG. 8 , when matched with different radial bearings, various test segment gaps 32 can be formed between the test spindle and the test outer cylinder 4 , wherein the test spindle is the rotor shaft and the test outer cylinder 4 is the stator.

Before the experiment, it is necessary to adjust the required eccentricity and test the main shaft offset form and connect it with the gap flow circulation pipeline, and adjust the opening and closing of the valve to determine the flow direction of the gap flow. During the experiment, measurements were made under different test spindle speeds, different gap flow rates and different gap flow fluid inlet temperatures, and the real-time axis trajectory of the test spindle and the axis of the test spindle were obtained through the eddy current displacement sensor arranged on the test outer cylinder 4. move to.

During the experiment, the differential pressure sensor and temperature sensor arranged at the inlet and outlet of the gap 32 of the test section were used to test the pressure drop and temperature rise of the gap flow, and the flowmeter in the gap flow circulation pipeline was used to measure the real-time flow rate of the gap flow.

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essential content of the present invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily, provided that there is no conflict.

Claims (7)

1. The utility model provides a vertical clearance flow power characteristic coefficient testing arrangement which characterized in that, includes rotation drive arrangement, whirling drive arrangement, clearance flow circulation pipeline and measuring device, wherein:

the rotation driving device comprises a rotation driving motor, a testing main shaft, a testing outer cylinder, an upper bearing seat and a lower bearing seat, wherein the upper bearing seat and the lower bearing seat are eccentric bearing seats, and the rotation driving motor drives the testing main shaft to rotate through a coupler; the upper end of the test main shaft is connected with the upper bearing seat, and the lower end of the test main shaft is connected with the lower bearing seat; the test main shaft penetrates through the test outer cylinder, and a gap exists between the test main shaft and the test outer cylinder to form a test section gap;

the upper part and the lower part of the testing section gap are respectively communicated with the gap flow circulating pipeline;

the measuring device is arranged on the rotation driving device;

the vortex driving device comprises a vortex driving motor, a revolution shaft and a belt pulley device, and the vortex driving motor drives the revolution shaft to rotate; the revolution shaft is connected with the upper bearing seat and the lower bearing seat through a belt pulley device so as to drive the test spindle to generate whirling motion;

the measuring device comprises an eddy current displacement sensor, a temperature sensor, a pull pressure sensor and a differential pressure sensor, wherein:

the eddy current displacement sensor is arranged on a displacement sensor mounting seat of the test outer cylinder;

the upper part and the lower part of the testing outer cylinder are provided with a temperature sensor and a differential pressure sensor which are used for measuring the temperature and the pressure at an inlet and an outlet of a gap between the testing sections;

the tension and pressure sensors are respectively arranged on the upper bearing seat and the lower bearing seat and are used for measuring acting force of the main shaft on the upper bearing seat and the lower bearing seat.

2. The vertical gap flow dynamic characteristic coefficient testing device as claimed in claim 1, wherein the bearing seat middle ring of the upper bearing seat and the lower bearing seat has an eccentricity amount relative to the center of the outer ring, and the eccentricity amount can be adjusted by the gears on the upper bearing seat and the lower bearing seat.

3. The vertical gap flow dynamic characteristic coefficient testing device according to claim 1, wherein the gap flow circulation line includes an inlet pipe section, an outlet pipe section, a circulation pump, and a regulation valve, wherein:

the inlet pipe section is communicated with the lower part of the gap of the test section; the outlet pipe section is communicated with the upper part of the gap of the test section;

the circulation pump drives the flow of fluid in the interstitial flow circulation line;

the regulating valve is used for regulating the flow of the fluid in the gap flow circulating pipeline.

4. The vertical gap flow dynamic characteristic coefficient testing device as claimed in claim 1, wherein the pulley device comprises a double pulley and two synchronous belts, the double pulley is driven by the vortex driving motor to drive the two synchronous belts to run, and the two synchronous belts are respectively connected with the middle ring of the upper bearing seat and the lower bearing seat.

5. The vertical gap flow dynamic characteristic coefficient testing device as claimed in claim 1, wherein the upper bearing seat and the lower bearing seat are respectively provided with at least one tension and pressure sensor in the moving direction of the pulley device for balancing the center of the bearing seat when the pulley device rotates.

6. The vertical gap flow dynamic characteristic coefficient testing device according to claim 1, further comprising a tension and pressure sensor mounting seat for mounting a tension and pressure sensor, wherein the tension and pressure sensor mounting seat is in a loose state before the tension and pressure sensor is mounted, and is in a tight state after the tension and pressure sensor is mounted.

7. The vertical gap flow dynamic characteristic coefficient testing device according to claim 1, wherein a plurality of valves are further disposed on the gap flow circulation pipeline for adjusting the flow direction of the fluid in the gap flow circulation pipeline.

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