CN107489609A - Vertical gap mobilization dynamic characteristic coefficient test device - Google Patents

Abstract

The invention provides a vertical gap flow dynamic characteristic coefficient test device, which includes an autorotation drive device, a vortex drive device, a gap flow circulation pipeline and a measuring device, wherein: the autorotation drive device includes an autorotation drive motor, a test spindle, a test external The cylinder, the upper bearing seat and the lower bearing seat, the self-rotation drive motor drives the test spindle to rotate; the test spindle connects the upper bearing seat and the lower bearing seat; the test spindle runs through the test outer cylinder, and a test section gap is formed between the test spindle and the test outer cylinder; The section gap is connected to the gap flow circulation pipeline; the measuring device is set on the rotation drive device; the vortex drive device includes a vortex drive motor, a revolution shaft and a pulley device, and the vortex drive motor drives the revolution shaft to rotate; the revolution shaft is generated by driving the main shaft through the pulley Vortex. The invention has precise structure, excellent design and high data acquisition accuracy; the invention changes the eccentricity by adjusting the gear of the eccentric bearing seat, and can meet the test requirements of different working conditions.

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 gap flow dynamic characteristic coefficient testing device.

Background technique

Canned motor pumps have important uses in the fields of national energy and national defense. This pump has the advantages of non-moving sealing and low vibration and noise. Canned electric pumps generally consist of a canned motor and an impeller directly connected through the motor shaft. There is a long and narrow annular gap in the axial direction between the inner rotor and the stator of the shielded motor, 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 dynamic characteristics of the canned motor pump rotor, and the test of the gap flow dynamic characteristic coefficient is of great significance for studying its influence on the canned motor pump rotor dynamic characteristics.

Contents of the invention

In view of the defects in the prior art, the object of the present invention is to provide a vertical gap flow dynamic characteristic coefficient testing device.

A vertical gap flow dynamic characteristic coefficient testing device provided according to the present invention includes an autorotation drive device, a vortex drive device, a gap flow circulation pipeline and a measuring device, wherein:

The autorotation driving device includes an autorotation drive motor, a test spindle, a test outer cylinder, an upper bearing seat and a lower bearing seat, and the autorotation drive motor drives the test spindle to rotate through a shaft 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 runs through the test outer cylinder, and there is a gap between the test main shaft and the test outer cylinder, forming 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 vortex drive device includes a vortex drive motor, a revolution shaft and a pulley device, the vortex 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 Vortex.

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 test outer cylinder are provided with temperature sensors and differential pressure sensors for measuring the temperature and pressure at the entrance and exit of the test section gap;

The tension and pressure sensors are arranged on the upper bearing seat and the lower bearing seat respectively, and are used to measure the force exerted by 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 test section gap; the outlet pipe section is connected to the upper part of the test section gap;

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

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

Preferably, the pulley device includes double pulleys and two synchronous belts, the vortex drive motor drives the double pulleys to drive the two synchronous belts to run, and the two synchronous 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 and 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 and pressure sensor mounting seat for installing the tension and pressure sensor, the tension and pressure sensor mounting seat is in a loose state before the tension and pressure sensor is installed, and is in a tight state after the tension and pressure sensor is installed.

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

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

1. The present invention has precise structure, excellent design, and high data acquisition 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 measures 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 action, and the pressure difference and temperature of the inlet and outlet of the fluid in the test section gap to measure the dynamic coefficient of the gap flow. specific analysis.

Description of drawings

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

Fig. 1 is the structural representation of vertical gap flow dynamic characteristic coefficient testing device;

Fig. 2 is the sectional view of the rotation driving device of the vertical gap flow dynamic characteristic coefficient testing 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 test outer cylinder of the present invention;

Fig. 5 is the structural representation of 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 comparative schematic diagram of a concentric bearing seat and an eccentric bearing seat of the present invention;

Fig. 8 is a combined schematic view 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;

Fig. 11 is a combined schematic diagram of the overall translation of the upper and lower bearing seats of the present invention and a uniform gap;

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

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

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

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

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

Figure 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 non-uniform;

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

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

The figure shows:

detailed description

The present invention will be described in detail below in conjunction with 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 those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

As shown in Figures 1 to 6, a vertical gap flow dynamic characteristic coefficient testing device provided according to the present invention includes: a rotation drive device, a vortex drive device, a gap flow circulation pipeline and a measuring device, wherein: the rotation The driving device includes a rotation drive motor, a test spindle, a test outer cylinder 4, an upper bearing seat 2 and a lower bearing seat 1, and the rotation drive motor drives the test spindle to rotate through a drum-shaped gear coupling 13; the upper end of the test spindle is rigidly coupled 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 bracket 26, and there is a gap between the test spindle and the test outer cylinder to form a test section gap 32, which 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 through the gears on the upper bearing seat 2 or the lower bearing seat 1.

Further, the measuring device is arranged on the rotation driving device, and the measuring 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 current The displacement sensor mounting seat 6 of the displacement sensor, the eddy current displacement sensor is close to the experimental main shaft through the displacement sensor mounting seat 6, and the eddy current displacement sensor measures the axis trajectory graph line, the key phase signal waveform and the real-time speed of the test spindle.

In more detail, the test outer cylinder 4 is also provided with a pressure sensor mount 5 for installing a differential pressure sensor, and the differential pressure sensor is used to test the pressure drop of the gap 32 of the test section; 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 entrance and exit of the test section gap 32; 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 base Above, the mounting seat of the tension-pressure sensor 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 exerted by 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 the other tension pressure sensor 31 is arranged according to the transmission direction of the pulley device to balance the seat of the bearing seat when the pulley device rotates. Heart. Adjust the tightness 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 tensile force sensor 31 is moderately stressed and the upper bearing seat 2 or lower bearing seat 1 and the test spindle are balanced. relative position.

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

To further illustrate, the gap flow circulation pipeline includes an inlet and outlet pipeline 21, a circulation pump and a regulating valve, wherein: the inlet section of the inlet and outlet pipeline 21 is connected to the lower part of the gap 32 of the test section; the outlet section of the inlet and outlet pipeline 21 The upper part of the gap 32 of the test section is connected; the circulation pump drives the flow of 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. Wherein, 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 arranged on the gap flow circulation pipeline for adjusting the flow direction and velocity of the fluid in the gap flow circulation pipeline.

In detail, the rotation drive device and the vortex drive device are tightly connected through the first transition support plate 10 , the second transition support plate 11 and the third transition support plate 12 .

The present invention measures the force exerted by the test spindle on the bearing seat and then deduces the force on the test spindle, so that the force on the test spindle can be inferred when there is fluid flowing through the gap and when there is no fluid flowing through, 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 eccentric direction, the assembled test spindle will produce a uniform position eccentricity in the axial direction relative to the test outer cylinder 4; use the upper bearing seat with different eccentricity or different eccentric directions 2 and the lower bearing seat 1, the assembled test spindle produces a non-uniform position eccentricity in the axial direction relative to the test outer cylinder 4, so that the force of the test spindle under different eccentricity and inclination states can be obtained.

In the case of eccentric positions of various test spindles, the flow rate and flow direction of the fluid in the gap 32 of the test section and the speed of the test spindle are adjusted, and the lateral vibration axis trajectory of the test spindle and the axial movement of the test spindle are measured in real time.

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

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

The axis trajectory of the test spindle under different eccentricities and the force of the gap flow on the test spindle are then calculated to calculate the dynamic characteristic coefficient of the gap flow at this time, and the influence of the eccentricity on the dynamic characteristic coefficient of the gap flow is obtained.

Under different gap flow rates, temperatures and different pre-rotations, by measuring the axis 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. The influence of curl on the dynamic characteristic coefficient of gap flow.

Under different gap widths, by measuring the axis 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 influence of the gap width on the dynamic characteristic coefficient of the gap flow is obtained.

The present invention is a vertical gap flow dynamic characteristic coefficient testing device, which matches the experimental content, and there is no such testing device at home and abroad.

The present invention controls the flow rate, 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 main shaft is eccentric relative to the test outer cylinder; by adjusting the gear of the eccentric bearing seat, the test main shaft is relatively Different eccentricities are generated in the axial direction of the test outer cylinder according to the experimental requirements; the real-time axis trajectory of the test spindle is measured by the eddy current displacement sensor assembled on the upper and lower parts of the test outer cylinder; Measure the force magnitude and direction of the test spindle with and without fluid action; use the differential pressure sensor assembled at the inlet and outlet of the test section gap 32 to measure the fluid in the test section gap 32 at different test spindle speeds and eccentric test spindle positions pressure drop.

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

As shown in Figure 7, the bearing seat is designed in a concentric form and an eccentric form, wherein the axis of the inner circle of the bearing in the form of position eccentricity has a position deviation from the axis of the outer circle of the bearing seat, and the position deviation can be customized according to the experiment.

As shown in FIG. 8 , when different radial bearings are used, various test segment gaps 32 between the test spindle and the test outer cylinder 4 can be formed, 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 the offset form of the test spindle, and connect it to 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 carried out under different test spindle speeds, different gap flow velocity 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. To move.

During the experiment, the differential pressure sensor and temperature sensor arranged at the inlet and outlet of the test section gap 32 were used to test the pressure drop and temperature rise of the gap flow, and the flow meter 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 specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. In the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims (8)

1. A vertical gap flow dynamic characteristic coefficient testing device is characterized in that it comprises a rotation drive unit, a vortex drive unit, a gap flow circulation pipeline and a measuring device, wherein: The autorotation driving device includes an autorotation drive motor, a test spindle, a test outer cylinder, an upper bearing seat and a lower bearing seat, and the autorotation drive motor drives the test spindle to rotate through a shaft 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 runs through the test outer cylinder, and there is a gap between the test main shaft and the test outer cylinder, forming 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 vortex drive device includes a vortex drive motor, a revolution shaft and a pulley device, the vortex 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 Vortex. 2. The vertical gap flow dynamic characteristic coefficient testing device according to claim 1, wherein the measuring device comprises 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 test outer cylinder are provided with temperature sensors and differential pressure sensors for measuring the temperature and pressure at the entrance and exit of the test section gap; The tension and pressure sensors are arranged on the upper bearing seat and the lower bearing seat respectively, and are used to measure the force exerted by the main shaft 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 upper bearing seat and the lower bearing seat are eccentric bearing seats, and the middle rings of the upper bearing seat and the lower bearing seat are opposite to each other. There is an eccentricity in the center of the outer ring, and the eccentricity can be adjusted through the gears on the upper bearing seat and the lower bearing seat. 4. The vertical gap flow dynamic characteristic coefficient testing device according to claim 1, wherein the gap flow circulation pipeline includes an inlet pipe section, an outlet pipe section, a circulating pump and a regulating valve, wherein: The inlet pipe section is connected to the lower part of the test section gap; the outlet pipe section is connected to the upper part of the test section gap; The circulation pump drives the flow of fluid in the interstitial flow circulation line; The regulating valve is used for regulating the flow rate of the fluid in the gap flow circulation pipeline. 5. vertical gap flow dynamic characteristic coefficient testing device according to claim 1, is characterized in that, described pulley device comprises double belt pulley and two synchronous belts, and vortex drive motor drives double belt pulley to drive two synchronous belts Running, the two synchronous belts are respectively connected to the middle ring of the upper bearing seat and the lower bearing seat. 6. The vertical gap flow dynamic characteristic coefficient testing device according to claim 2, characterized in that, the upper bearing seat and the lower bearing seat respectively have at least one tension pressure sensor set in the direction of movement of the pulley device for balancing the pulley The seat center of the bearing seat when the device rotates. 7. The vertical gap flow dynamic characteristic coefficient testing device according to claim 2, characterized in that, it also includes a tension pressure sensor mounting seat for installing a tension pressure sensor, and the tension pressure sensor mounting seat is installed with a tension pressure sensor It is in a loose state before, and it is in a tight state after installing the tension and pressure sensor. 8. The vertical gap flow dynamic characteristic coefficient test device according to claim 1, wherein a plurality of valves are also arranged on the gap flow circulation pipeline for adjusting the flow direction of the fluid in the gap flow circulation pipeline .