CN113007184B - Symmetrical wheel disc type variable frequency flow pulsation generating device - Google Patents
Symmetrical wheel disc type variable frequency flow pulsation generating device Download PDFInfo
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- CN113007184B CN113007184B CN202110225206.4A CN202110225206A CN113007184B CN 113007184 B CN113007184 B CN 113007184B CN 202110225206 A CN202110225206 A CN 202110225206A CN 113007184 B CN113007184 B CN 113007184B
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- variable frequency
- wheel disc
- transfer case
- symmetrical
- pulsation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/12—Fluid oscillators or pulse generators
- F15B21/125—Fluid oscillators or pulse generators by means of a rotating valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15C—FLUID-CIRCUIT ELEMENTS PREDOMINANTLY USED FOR COMPUTING OR CONTROL PURPOSES
- F15C3/00—Circuit elements having moving parts
- F15C3/16—Oscillators
Abstract
The invention aims to provide a symmetrical wheel disc type variable frequency flow pulsation generating device which comprises a variable frequency regulator, a variable frequency motor, a gear type transfer case, a symmetrical porous wheel disc and a pulsation fluid pipeline, wherein the symmetrical porous wheel disc and the pulsation fluid pipeline are fixed on an integral device support through a wheel disc pipeline support, the variable frequency regulator, the variable frequency motor and the gear type transfer case are fixed on the integral device support, the variable frequency regulator is connected with the variable frequency motor through a connecting lead, the variable frequency motor is connected with the gear type transfer case through a tail shaft of the motor, the gear type transfer case is connected with a transfer case shaft, the symmetrical porous wheel disc is connected with a wheel disc shaft, and the transfer case shaft is connected with the wheel disc shaft through a belt transmission device. The wheel disc in the flow pulsation generating device has multiple operating states, has the advantages of multi-gear adjustable pulsation amplitude and large range of pulsation amplitude adjustment, and also has the advantages of simple transmission structure, strong operation reliability and convenient installation and arrangement.
Description
Technical Field
The invention relates to a dynamic response device of a hydraulic component under pulsation excitation, in particular to a device for researching flow characteristics and vibration noise in a fluid machine and a pipeline system.
Background
The stability of the centrifugal pump pipe system plays a crucial role in the safety of a ship or a power station. The operation working point of the centrifugal pump pipeline system is determined by the intersection point of the performance curve of the pump and the performance curve of the pipeline, when the system adjusts the flow, the shapes and the positions of the two performance curves of the pump and the pipeline are changed, when the characteristic curves of the pump and the pipeline are unreasonably matched due to the delay response, namely the system operates under the working condition deviating, the flow pulsation is generated in the system, the instability of the system is caused, the severe vibration noise is accompanied, and the stability of the operation of the system is seriously influenced. In order to research the vibration noise characteristic of flow instability caused by flow pulsation in the running process of a centrifugal pump pipeline system, a test under a flow pulsation working condition is required in an equipment development test stage, and the running stability and the low vibration noise characteristic of equipment are tested; however, the method is limited by site conditions in the equipment development and test stage, a systematic oscillation effect in actual operation cannot be formed, and in order to better simulate the influence of actual flow oscillation working conditions on the equipment, a flow pulsation device is installed in a pipeline system in the equipment development and test stage, so that the centrifugal pump pipeline system can operate under the flow pulsation working conditions with different amplitudes and frequencies. Most of the traditional flow pulsation generating devices are of a positive displacement type, namely a plunger type, for example, in the patent with the application number of 200810232217.X, a motor is used for driving a rotary table to rotate, a propelling shaft and a propelling linear guide rail group on the rotary table convert circular motion into reciprocating linear simple harmonic motion, and the traditional flow pulsation generating devices have the defects of complex transmission structure, strong dynamic unbalance characteristic, incapability of stably generating high-frequency flow pulsation and difficulty in adjusting the amplitude and the frequency of the pulsation. The wheel disc type flow pulsation generator, as disclosed in patent application No. 201110253476.2de, eliminates the disadvantage of strong dynamic unbalance characteristic of the plunger type flow pulsation generator, but the wheel disc is provided with a large number of through holes in the circumferential direction, and the through holes are small in size, so that the flow pulsation amplitude is small; and the pipeline is always in the cycle process from full closing to full opening when the wheel disc type flow pulsation generator operates, so that the adjustment of the pulsation amplitude is difficult.
Disclosure of Invention
The invention aims to provide a symmetrical wheel disc type variable frequency flow pulsation generating device which generates flow pulsation with adjustable pulsation amplitude and frequency in multiple steps in a pipeline system.
The purpose of the invention is realized as follows:
the invention relates to a symmetrical wheel disc type variable frequency flow pulsation generating device, which is characterized in that: the device comprises a variable frequency regulator, a variable frequency motor, a gear type transfer case, a symmetrical porous wheel disc and a pulsating fluid pipeline, wherein the symmetrical porous wheel disc and the pulsating fluid pipeline are fixed on a device integral support through a wheel disc pipeline support, the variable frequency regulator, the variable frequency motor and the gear type transfer case are fixed on the device integral support, the variable frequency regulator and the variable frequency motor are connected through a connecting wire, the variable frequency motor and the gear type transfer case are connected through a motor tail shaft, the gear type transfer case is connected with a transfer case shaft, the symmetrical porous wheel disc is connected with the wheel disc shaft, and the transfer case shaft is connected with the wheel disc shaft through a belt transmission device.
The present invention may further comprise:
1. the frequency conversion regulator regulates the frequency of alternating current to drive the frequency conversion motor, the frequency conversion motor generates power output with different rotating speeds and transmits the power output to the gear type transfer case, the gear type transfer case transfers the single power input from the frequency conversion motor into two outputs with the same rotating speed and torque and opposite rotating directions under the working condition that one wheel disc of the symmetrical porous wheel disc rotates and the other wheel disc of the symmetrical porous wheel disc is static, the two power outputs generated by the gear type transfer case are transmitted to two symmetrical wheel disc shafts through a belt transmission device to further drive the symmetrical porous wheel disc to rotate, the two wheel discs rotate in the same rotating speed and opposite rotating directions in the pulsating fluid pipeline under the working condition that the symmetrical porous wheel disc rotates and the other wheel disc is static under the working condition that the one wheel disc rotates and the other wheel disc is static, through holes uniformly distributed in the circumferential direction on the wheel disc and the pulsating fluid pipeline fixed in the wheel disc sealing area through bolts form a liquid flowing channel, the amplitude of the pulsating fluid in the pulsating fluid pipeline is periodically changed through the rotation of the symmetrical porous wheel disc, and the pulsation area is adjusted to realize the simple flow rate and the simple harmonic generation of the frequency.
The invention has the advantages that: the invention can generate simple harmonic flow pulsation with multi-gear adjustable pulsation amplitude and frequency in a pipeline system. The wheel disc in the flow pulsation generating device has multiple operating states, has the advantages of multi-gear adjustable pulsation amplitude and large range of pulsation amplitude adjustment, and also has the advantages of simple transmission structure, strong operation reliability and convenient installation and arrangement.
Drawings
FIG. 1 is a schematic view of the structure of the present invention;
FIG. 2 is a schematic view of a symmetrical multi-orifice disc and a pulsating fluid conduit of the present invention;
FIG. 3 is a schematic diagram of a pulsation amplitude and frequency adjustment system;
fig. 4 is a trend graph of the change of the flow area of the pipeline.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to fig. 1-4, the symmetrical wheel disc type variable frequency flow pulsation generating device provided by the invention mainly comprises a variable frequency regulator 1, a variable frequency motor 2, a gear type transfer case 3, a transfer case shaft 4, a belt transmission device 5, a symmetrical wheel disc shaft 6, a symmetrical porous wheel disc 7, a pulsating fluid pipeline 8, a device integral support 9 and a wheel disc pipeline support 10. Fig. 1 is an axial schematic view of a symmetrical wheel disc type variable frequency flow pulsation generator of the present invention, which mainly shows a variable frequency regulator 1, a variable frequency motor 2, a gear type transfer case 3, a transfer case shaft 4, a belt transmission device 5, a symmetrical wheel disc shaft 6, a device integral support 9, and a wheel disc pipeline support 10; fig. 2 is a schematic diagram of the inside of the symmetrical wheel disc type variable frequency flow pulsation generator of the present invention, which mainly shows a symmetrical porous wheel disc 7 and a pulsation fluid pipeline 8.
The invention provides a symmetrical wheel disc type variable frequency flow pulsation generating device, which has the connection relation that: the symmetrical porous wheel disc 7 and the pulsating fluid pipeline 8 are fixed on a device integral support 9 by a wheel disc pipeline support 10, the variable frequency regulator 1, the variable frequency motor 2 and the gear type transfer case 3 are fixed on the device integral support 9, the variable frequency regulator 1 is connected with the variable frequency motor 2 through a connecting lead, the variable frequency motor 2 is connected with the gear type transfer case 3 through a motor tail shaft, the gear type transfer case 3 is connected with a transfer case shaft 4, the symmetrical porous wheel disc 7 is connected with a wheel disc shaft 6, and the transfer case shaft 4 is connected with the wheel disc shaft 6 through a belt transmission device 5.
When the symmetrical wheel disc type variable frequency flow pulsation generating device works, the frequency of alternating current is adjusted through the frequency conversion adjuster 1 to drive the variable frequency motor 2, the variable frequency motor 2 generates power output with different rotating speeds and transmits the power output to the gear type transfer case 3, the transfer case 32 transfers single power input from a motor into two outputs with the same rotating speed and torque and opposite rotating directions under the working condition that two wheels rotate simultaneously, the transfer case 3 outputs single power with the same rotating speed and torque and the same input under the working condition that one wheel disc rotates and one wheel disc is static, the two power outputs generated by the transfer case 3 are transmitted to two symmetrical wheel disc shafts 6 through the belt transmission device 5 to further drive the two symmetrical porous wheel discs 7 to rotate, the two wheel discs 7 rotate in the same rotating speed and opposite rotating directions in the pulsation fluid pipeline 8 under the working condition that the two wheel discs 7 rotate simultaneously, only one wheel disc rotates and the other wheel disc rotates in the pulsation fluid pipeline 8 and keeps static, through holes uniformly distributed in the circumferential direction on the wheel disc form a liquid flow passage with the pulsation fluid pipeline 8 fixed in the sealing area of the wheel disc, and the pulsation fluid passage with adjustable frequency is changed through the porous wheel disc 7, and the simple flow rate is adjusted. The alternating current with different frequencies is output by adjusting the frequency conversion controller 1, the alternating current output by the frequency converter 1 is transmitted to the variable frequency motor 2 through a connecting lead, and the rotating speed of the motor 2 is adjusted because the rotating speed of the motor 2 is in direct proportion to the alternating current frequency and the rotating speed of the motor 2 is changed along with the change of the alternating current frequency through the frequency converter 1, so that the frequency adjustment of simple harmonic flow pulsation is realized; the rotation state of two output shafts 6 is adjusted in the gear type transfer case 3 by adjusting the rotation mode of two symmetrical wheel discs 7, the effect of simultaneously rotating two wheel discs 7 or rotating one wheel disc and keeping the other wheel disc static can be realized due to the fact that the transfer case 3 is provided with a differential lock, the initial phase of the two wheel discs is changed by adjusting the initial position of the shaft of the transfer case, the two wheel discs linearly change the overflowing area under a certain rotating speed under the combined action of the two wheel discs, and the purpose of adjusting the pulsation amplitude of simple harmonic flow pulsation in multiple gears is realized. A continuous fluid flow pulsation with a certain frequency is generated in the conduit 8 due to the periodic rotation of the symmetrical perforated disc 7 in the pulsating fluid conduit 8, which causes a periodic variation of the flow area of the fluid in the conduit, while a continuous fluid flow pulsation with a certain frequency is generated in the conduit 8 due to the fact that the flow area variation in the conduit 8 necessarily varies its fluid flow. In addition, in the symmetrical wheel disc type variable frequency flow pulsation generating device, the pipelines 8 cannot be completely closed or opened, and the wheel disc 7 in the device has multiple running states, so that the symmetrical wheel disc type variable frequency flow pulsation generating device is convenient in pulsation amplitude adjustment and large in pulsation amplitude adjustment range.
As shown in fig. 3, a schematic diagram of a pulse amplitude frequency adjusting system of a symmetric wheel disc type variable frequency flow pulse generator according to the present invention, which realizes multi-stage adjustment of pulse amplitude frequency, includes the following principles: the variable frequency regulator 1 is connected with the variable frequency motor 2 through a connecting wire, the alternating current frequency is controlled by regulating the variable frequency regulator 1, the rotating speed of the motor is in direct proportion to the alternating current frequency, and the rotating speed of the motor is changed when the alternating current frequency is changed by the variable frequency regulator 1; the variable frequency motor 2 is connected with the gear type transfer case 3 through a motor tail shaft, and the power generated by the motor 2 is directly transmitted to the transfer case 3; the gear type transfer case 3 with differential lock can divide the single power input by the motor into two parts of power output with equal rotating speed and torque and opposite rotating directions, and can also realize the effect that one shaft rotates and the other shaft is static, the transfer case 3 processes the power directly transmitted by the motor 2, and the power is changed into the power input required by the flow pulsation generating device; the 4 end of the transfer case shaft is provided with a plurality of scales, and the initial phase of the wheel disc of the device can be adjusted by rotating one shaft end to a certain scale, so that the multi-gear adjustment of the amplitude of the pulsating flow is realized; the transfer case 3 and the wheel disc 7 are connected with the belt transmission device 5 through the rotating shaft, so that the power processed by the transfer case 3 is transmitted to the symmetrical wheel disc 7 to drive the symmetrical wheel disc 7 to rotate in the pulsating fluid pipeline, and the effect of generating simple harmonic flow pulsation with adjustable amplitude and frequency in multiple steps is finally realized.
The relationship among the flow rate, the overflowing coefficient and the overflowing area of the fluid in the pipeline is shown as the following formula:
wherein Q is the flow rate, m 3 /h，C d Is the flow coefficient, A (x) is the flow area, mm 2 Rho is the density of the hydraulic medium, kg/m 3 And delta P is the pressure difference between the inlet and the outlet of the pipe section, and is MPa. Under the condition that other conditions are not changed, the flow rate of the fluid can be considered to be in direct proportion to the flow area.
As shown in the attached figure 4, the overflowing area in the pipeline presents 4 wave crests and wave troughs every time the wheel disc rotates 360 degrees in the symmetrical wheel disc type variable frequency flow pulsation generating device, and the amplitude of the fluctuation quantity of the working condition that the two wheel discs rotate together is 2 times that of the working condition that one wheel disc rotates and the other wheel disc is static. And because the initial phase of the wheel disc of the device can be adjusted by rotating a transfer case shaft, the multi-gear adjustment of the amplitude of the pulsating flow is realized, so that the amplitude of the pulsating flow generated by the flow pulsation generating device of the invention can be adjusted by multiple gears between the maximum value and the minimum value shown in figure 4. FIG. 4 proves that the pulsation amplitude and the pulsation frequency of the flow pulsation generating device can be adjusted in multiple steps, and the amplitude adjusting range is large.
Claims (1)
1. The utility model provides a symmetry wheel disk variable frequency flow pulsation generating device which characterized in that: the device comprises a variable frequency regulator, a variable frequency motor, a gear type transfer case, two symmetrical porous wheel discs and a pulsating fluid pipeline, wherein the two symmetrical porous wheel discs and the pulsating fluid pipeline are fixed on a device integral support through a wheel disc pipeline support; the variable frequency regulator regulates the frequency of alternating current to drive the variable frequency motor, the variable frequency motor generates power output with different rotating speeds and transmits the power output to the gear type transfer case, the gear type transfer case transfers the single power input from the variable frequency motor into two outputs with the same rotating speed and torque and opposite rotating directions under the working condition that the two symmetrical porous wheel discs rotate simultaneously, the two power outputs generated by the gear type transfer case are transmitted to two symmetrical wheel disc shafts through the belt transmission device to drive the two symmetrical porous wheel discs to rotate, and the two symmetrical porous wheel discs rotate in the pulsating fluid pipeline with the same rotating speed and opposite rotating directions; when one of the two symmetrical porous wheel discs rotates and is static, the gear type transfer case outputs a rotating speed torque, only one symmetrical porous wheel disc rotates in the pulsating fluid pipeline, and the other one of the two symmetrical porous wheel discs keeps static; through holes uniformly distributed on the two symmetrical porous wheel discs along the circumferential direction and a pulsating fluid pipeline fixed in the sealing areas of the two symmetrical porous wheel discs by bolts form a liquid flow channel, and the overflowing area of the fluid channel is periodically changed by rotating one or two of the two symmetrical porous wheel discs in the pulsating fluid pipeline, so that the generation of simple harmonic flow pulsation with adjustable pulsation amplitude and frequency is realized.
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| CN202110225206.4A CN113007184B (en) | 2021-03-01 | 2021-03-01 | Symmetrical wheel disc type variable frequency flow pulsation generating device |
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| CN202110225206.4A CN113007184B (en) | 2021-03-01 | 2021-03-01 | Symmetrical wheel disc type variable frequency flow pulsation generating device |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102410288A (en) * | 2011-08-30 | 2012-04-11 | 北京航空航天大学 | Wheel-disc-type flow pulsation generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2903698B1 (en) * | 1979-01-31 | 1980-08-14 | Rohde & Schwarz | Impulse generator |
| CN2317949Y (en) * | 1997-01-19 | 1999-05-12 | 高师敏 | Pulse fluid generator |
| JP2003021063A (en) * | 2001-07-03 | 2003-01-24 | Unozawa Gumi Iron Works Ltd | Gas pulsation restricting device |
| SE529415C2 (en) * | 2005-12-22 | 2007-08-07 | Atlas Copco Rock Drills Ab | Pulse generator and pulse machine for a cutting tool |
| CN106441918B (en) * | 2016-09-12 | 2019-02-05 | 中国人民解放军国防科学技术大学 | A kind of air intake test pulsation back-pressure generation device |
| CN108645622A (en) * | 2018-03-15 | 2018-10-12 | 河北师范大学 | A kind of turbocharger Unsteady characteristics test impulse generator |
| CN208281564U (en) * | 2018-06-19 | 2018-12-25 | 广东美芝精密制造有限公司 | Fluid pressure switching valve, capacity-varying rotary type compressor and refrigerating circulatory device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102410288A (en) * | 2011-08-30 | 2012-04-11 | 北京航空航天大学 | Wheel-disc-type flow pulsation generator |
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