CN113027875A - Rotary flow pulsation generating device - Google Patents
Rotary flow pulsation generating device Download PDFInfo
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- CN113027875A CN113027875A CN202110225215.3A CN202110225215A CN113027875A CN 113027875 A CN113027875 A CN 113027875A CN 202110225215 A CN202110225215 A CN 202110225215A CN 113027875 A CN113027875 A CN 113027875A
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- baffle
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- overflowing
- transmission shaft
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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
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Abstract
The invention aims to provide a rotary flow pulsation generating device, which comprises a pipe section, an overflowing baffle, a motor and a shell, wherein a transmission shaft is connected with a first belt pulley, a motor shaft of the motor is connected with a second belt pulley, the first belt pulley and the second belt pulley are connected through a belt, the overflowing baffle is arranged outside the transmission shaft and fixed with the transmission shaft, the shell is arranged outside the overflowing baffle, the shell is fixed on the pipe section, the pipe section is provided with a radial opening along the radial direction of the pipe section, the overflowing baffle extends into the radial opening, the shell is fixed with a base, and the base is fixed on the ground. The flow pulsation device has the advantages of excellent dynamic balance characteristic, small axial force, compact structure and convenient installation of a pipeline interface.
Description
Technical Field
The invention relates to a testing device for acoustic structures of fluid machines such as pumps and valves, in particular to a dynamic characteristic test for the acoustic structures of the fluid machines such as the pumps and the valves.
Background
The pipeline system comprises elements such as a pump, a valve, a pipeline and the like, and all the elements work cooperatively to ensure the safety, stability, high efficiency and economic operation of the whole set of equipment. The operating point of the piping system is determined by both the pump head performance curve and the piping impedance characteristic curve (including valves and piping). When the system adjusts the flow, the shape and position of the pump performance curve and the pipeline characteristic curve are changed, which causes the working point of the system to change, and when the pump and pipeline characteristic curve are unreasonably matched due to the delay response, the flow pulsation is generated in the system, which causes the instability of the system. The flow regulating method of the pipeline system mainly comprises two types of throttling regulation and variable speed regulation, wherein the throttling regulation regulates the flow by changing the opening degree of a valve, the change of the opening degree of the valve causes the change of the impedance characteristic of the pipeline system, when the pipeline system is seriously deviated from the rated working condition, the efficiency of the pipeline system is reduced, and abnormal vibration phenomena such as large fluctuation of the flow and the pressure of a pump and the valve occur; variable speed regulation performs flow regulation by varying the speed of rotation, which causes flow and pressure fluctuations in the system due to instability in speed regulation resulting in load fluctuations and speed fluctuations. No matter the speed change adjustment or the throttle adjustment is carried out, the system is in a working condition deviating from a design point, the performance of the pump is unreasonably matched with the impedance characteristic of the pipeline, load fluctuation is caused, the system works in a working condition of fluctuating flow, complex coupling oscillation is induced to be generated in the pipeline system, the phenomenon of overlarge vibration is caused, and the safety and the reliability of the pipeline system are influenced. The pipeline system of military products has more strict requirements on vibration noise indexes, and the pipeline system is required to meet the requirement of low vibration noise in the process of adjusting the working condition.
In order to study the vibration characteristics of the pipeline system caused by flow fluctuation in the flow regulation process, the test of the flow fluctuation severe working condition needs to be carried out at the prototype test stage, the reliability and the vibration noise characteristics of the equipment are verified, but the pipeline system with the actual size is difficult to build due to the limitation of site conditions at the prototype test stage, and the oscillation system in actual operation cannot be built. In order to better simulate the actual flow oscillation, the prototype system is actively added with a flow pulsation generator, and can output the fluctuation flow with different frequencies and amplitudes. The current commonly used mechanical flow pulsation generating device comprises a plunger type flow pulsation generator and a wheel disc type flow pulsation generator, the application numbers of which are respectively patents of 200810232217.X and 201110253476.2, the plunger type flow pulsation generator utilizes a motor to drive a turntable to realize the reciprocating motion of a plunger in a cylinder barrel, and because the dynamic balance characteristics of reciprocating motion parts such as the plunger are poor, the background vibration noise is large, so that the device cannot stably generate high-frequency pulsation flow. The wheel disc type flow pulsation generator is suitable for a pipeline system with a smaller diameter than a pipeline, a through hole with the diameter equal to that of an overflowing pipeline is arranged on the wheel disc, flow pulsation within 1000Hz is realized through rotation of the wheel disc, and the defect of poor dynamic balance of plunger type flow pulsation is overcome. However, the through holes on the wheel disc are densely arranged and have small size, so that the flow pulsation amplitude is small, the axial force is large, and the continuous large-flow pulsation requirement of a pipeline system cannot be met.
Disclosure of Invention
The invention aims to provide a rotary flow pulsation generating device which meets the continuous large-flow pulsation required by a pipeline system and verifies the reliability of the pipeline system under the dynamic operation condition.
The purpose of the invention is realized as follows:
the invention relates to a rotary flow pulsation generating device, which is characterized in that: including the pipeline section, overflow the baffle, including a motor, an end cap, a controller, and a cover plate, the transmission shaft is connected first belt pulley, the second belt pulley is connected to the motor shaft of motor, first belt pulley and second belt pulley pass through the belt and link to each other, it is fixed mutually at the transmission shaft outside and with the transmission shaft to overflow the baffle installation casing in the baffle outside, the casing is fixed on the pipeline section, the pipeline section radially sets up a radial opening along it, it stretches into this radial opening to overflow the baffle, the casing is fixed mutually with the base, the base is fixed subaerial.
The present invention may further comprise:
1. the outer ring of the overflowing baffle is provided with blades, smooth transition is carried out between the blades, the blade top parts of the blades are located inside the pipe sections and correspond to the minimum overflowing area of the pipe sections, and the blade root parts of the blades are located inside the pipe sections and correspond to the maximum overflowing area of the pipe sections, the overflowing baffle rotates around the transmission shaft under the driving of the motor, so that the overflowing area of the pipe sections can be periodically changed.
2. And a mark is arranged on the transmission shaft every 10 degrees.
The invention has the advantages that: the flow pulsation device has the advantages of excellent dynamic balance characteristic, small axial force, compact structure and convenient installation of a pipeline interface.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a partial schematic view of an overflow baffle;
FIG. 4 is a graph showing the change in the flow area of a pipe segment after the flow baffle rotates one turn;
fig. 5 is a schematic diagram of a flow pulsing device test arrangement.
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. 1-5, the invention provides a rotary flow pulsation excitation device with adjustable frequency and amplitude, which comprises a pipe section 1, an overflow baffle 2, a shell 3, a shaft 4, a belt pulley 5, a belt 6, a motor 7 and a base 8. Overflowing baffle 2 and violently inserting pipeline section 1, transmission shaft 4 overflows baffle 2 through pin joint, installs and plays sealed effect at the casing 3 that overflows the baffle 2 outside, is connected through belt 6 and belt pulley 5 between transmission shaft 4 and the motor 7, ensures motor 7 and 4 rotational speeds of transmission shaft synchronous, and the complete equipment is all fixed on base 8, and base 8 passes through rag bolt with ground and connects. When the motor 7 drives the transmission shaft 4 and the overflowing baffle 2 to rotate, the overflowing area of the pipe section 1 changes periodically to generate periodic fluctuation of flow, the flow fluctuation frequency can be adjusted by adjusting the rotating speed of the motor 7, and the change of the flow fluctuation amplitude can be realized by replacing the overflowing baffles 2 with different sizes and adjusting the opening of the flow adjusting valve of the system, so that the regulation of the flow fluctuation frequency and amplitude in the pipeline system is realized.
Selecting a pipeline with proper pipe diameter and length, and cutting a cut with a certain width along the radial direction of the selected pipeline;
on the premise of ensuring the sealing of the cut, inserting an overflowing baffle plate with proper thickness along the radial cut of the pipeline, uniformly distributing four same blades on the overflowing baffle plate, wherein the top of each blade corresponds to the minimum overflowing area of the pipeline, the root of each blade corresponds to the maximum overflowing area, the overflowing baffle plate is connected with a transmission shaft through a cylindrical pin, the axis of the transmission shaft and the axis of the pipeline are spaced at a certain distance, and the overflowing baffle plate rotates around the transmission shaft to realize the periodical change of the overflowing area of the pipeline;
the transmission shaft is connected with the motor through a belt, the overflowing baffle rotates under the driving of the motor, blades on the baffle periodically change the overflowing area of a pipeline, when the top of each blade sweeps the pipeline (the overflowing area of the pipeline is minimum), the flow of the pipeline is minimum, but a certain overflowing area is still left in the pipeline to ensure the continuous flow of fluid, when the root of each blade sweeps the pipeline (the overflowing area of the pipeline is maximum), the flow of the pipeline is maximum, and the overflowing baffle periodically changes the overflowing area of the pipeline to generate continuous flow pulsation;
the change of the flow fluctuation amplitude is realized by replacing the overflowing baffle plates with different molded lines and finely adjusting the opening of the flow regulating valve, and the change of the fluctuation frequency is realized by changing the rotating speed of the motor.
Referring to a front view section of a flow pulsation device in fig. 1 and a left view of the flow pulsation device in fig. 2, a pipe section 1 is provided with an opening along a radial direction, an overflowing baffle 2 is placed in the radial opening of the pipe section 1, the overflowing baffle 2 is sleeved on a shaft 4, the overflowing baffle 2 is driven to rotate by a motor 7, a belt pulley 5 and a belt 6, a shell 3 is welded on the pipe section 1 to provide sealing and supporting for the flow pulsation device, the shell 3 is connected with a base 8 through bolts, and the base 8 is directly fixed on the ground through anchor bolts.
In order to prevent the fluctuation amount of flow fluctuation from leaking from the gap between the overflowing baffle 2 and the pipe section 1 and the shell 3 to cause the loss of the flow fluctuation amount, the matching size of the overflowing baffle 2, the shell 3 and the pipe section 1 is selected to be small, the flow resistance at the position is ensured to be large, and the loss of the flow fluctuation amount is reduced.
The selected matching size between the pipe section 1 and the overflowing baffle 2 plays a role in reducing flow fluctuation loss, and meanwhile, high-pressure fluid is guided into the shell 3, so that the pressure difference before and after the overflowing baffle is balanced, and the axial force borne by the shaft 4 is reduced.
Referring to fig. 3, a partial schematic view of the flow baffle 2, the flow baffle 2 has 4 blades, the top of each blade corresponds to the minimum flow area of the pipe segment 1, the root of each blade corresponds to the maximum flow area of the pipe segment 1, and the relationship between the flow and the flow area is as follows:
in the formula, Q is flow, m3/h, Cd is flow coefficient, A (x) is flow area, mm2, rho is density of hydraulic medium, Kg/m3, and delta P is pressure difference between inlet and outlet of pipe section, MPa. According to the formula I, the flow rate is in positive correlation with the flow area, the flow pulsation device is positioned at the position where the minimum flow area corresponds to the minimum flow rate, and the maximum flow area corresponds to the maximum flow rate.
Referring to fig. 4, a graph of the change of the flow area of the pipeline after the flow baffle 2 rotates one circle, when the flow baffle 2 rotates one circle, four blades sweep the pipe section 1 in sequence, the flow area of the pipe section 1 appears 4 times of periodic peaks and troughs, and the flow rate also appears 4 times of periodic peaks and troughs according to a formula.
Referring to fig. 5, a schematic diagram of a test arrangement of a flow pulsating apparatus installed between a pump and a flow regulating valve through which a piping system regulates the total flow of the system. Because the rotating speed of the motor is fast, the general flowmeter is difficult to capture the flow pulsation with high frequency and large amplitude, the invention adopts the method of measuring the flow fluctuation amplitude in a quasi-steady state, and the operation process is as follows: a mark is made on the shaft 3 at intervals of 10 degrees, when the opening of a flow regulating valve of a pipeline system is fixed, the steady-state flow is recorded at every 10 degrees through the manual rotating shaft 4, and the flow fluctuation amount of the overflowing baffle 2 rotating for one circle is obtained, so that the flow fluctuation amplitude values with different frequencies are similar.
The flow fluctuation amplitude can be adjusted by adjusting the opening of the flow regulating valve and replacing the overflowing baffle plates of different blade molded lines, and the flow fluctuation frequency can be adjusted by adjusting the rotating speed of the motor.
Claims (3)
1. A rotary flow pulsation generating device is characterized in that: including the pipeline section, overflow the baffle, including a motor, an end cap, a controller, and a cover plate, the transmission shaft is connected first belt pulley, the second belt pulley is connected to the motor shaft of motor, first belt pulley and second belt pulley pass through the belt and link to each other, it is fixed mutually at the transmission shaft outside and with the transmission shaft to overflow the baffle installation casing in the baffle outside, the casing is fixed on the pipeline section, the pipeline section radially sets up a radial opening along it, it stretches into this radial opening to overflow the baffle, the casing is fixed mutually with the base, the base is fixed subaerial.
2. A rotary flow impulse generator as claimed in claim 1, wherein: the outer ring of the overflowing baffle is provided with blades, smooth transition is carried out between the blades, the blade top parts of the blades are located inside the pipe sections and correspond to the minimum overflowing area of the pipe sections, and the blade root parts of the blades are located inside the pipe sections and correspond to the maximum overflowing area of the pipe sections, the overflowing baffle rotates around the transmission shaft under the driving of the motor, so that the overflowing area of the pipe sections can be periodically changed.
3. A rotary flow impulse generator as claimed in claim 1 or 2, wherein: and a mark is arranged on the transmission shaft every 10 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110225215.3A CN113027875A (en) | 2021-03-01 | 2021-03-01 | Rotary flow pulsation generating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110225215.3A CN113027875A (en) | 2021-03-01 | 2021-03-01 | Rotary flow pulsation generating device |
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| CN113027875A true CN113027875A (en) | 2021-06-25 |
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| CN202110225215.3A Pending CN113027875A (en) | 2021-03-01 | 2021-03-01 | Rotary flow pulsation generating device |
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1408623A (en) * | 1971-11-02 | 1975-10-01 | Svenska Flaektfabriken Ab | Flow control devices |
| CN101403406A (en) * | 2008-11-11 | 2009-04-08 | 西安交通大学 | Plunger type flow pulsation generator |
| CN102928319A (en) * | 2012-10-22 | 2013-02-13 | 哈尔滨工程大学 | Experiment and measurement device for researching flow characteristics of two-phase pulsating flow in rectangular channel |
| CN103233708A (en) * | 2013-04-22 | 2013-08-07 | 东北石油大学 | Rotary flow stabilizer |
| CN203203631U (en) * | 2013-04-27 | 2013-09-18 | 宁夏厚源自控科技有限公司 | Rotation type high-grade pore plate throttling device |
| CN103899809A (en) * | 2014-03-05 | 2014-07-02 | 哈尔滨工程大学 | Rotary plate type throttling resistance regulator |
| CN203979435U (en) * | 2014-07-09 | 2014-12-03 | 云南绿洲节水灌溉有限责任公司 | A kind of over-voltage over-current protection valve for drip irrigation pipe |
| CN106441918A (en) * | 2016-09-12 | 2017-02-22 | 中国人民解放军国防科学技术大学 | Apparatus for generating fluctuating counter pressure in air inlet test |
| CN107228109A (en) * | 2017-06-23 | 2017-10-03 | 江苏科技大学 | A kind of ball-valve type flutter generator |
| CN111375499A (en) * | 2020-04-21 | 2020-07-07 | 合肥工业大学 | Pulse gas jet generating device with adjustable excitation frequency and duty ratio |
| CN111503059A (en) * | 2020-04-10 | 2020-08-07 | 上海交通大学 | Inlet airflow pulsation adjusting device of centrifugal compressor |
-
2021
- 2021-03-01 CN CN202110225215.3A patent/CN113027875A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1408623A (en) * | 1971-11-02 | 1975-10-01 | Svenska Flaektfabriken Ab | Flow control devices |
| CN101403406A (en) * | 2008-11-11 | 2009-04-08 | 西安交通大学 | Plunger type flow pulsation generator |
| CN102928319A (en) * | 2012-10-22 | 2013-02-13 | 哈尔滨工程大学 | Experiment and measurement device for researching flow characteristics of two-phase pulsating flow in rectangular channel |
| CN103233708A (en) * | 2013-04-22 | 2013-08-07 | 东北石油大学 | Rotary flow stabilizer |
| CN203203631U (en) * | 2013-04-27 | 2013-09-18 | 宁夏厚源自控科技有限公司 | Rotation type high-grade pore plate throttling device |
| CN103899809A (en) * | 2014-03-05 | 2014-07-02 | 哈尔滨工程大学 | Rotary plate type throttling resistance regulator |
| CN203979435U (en) * | 2014-07-09 | 2014-12-03 | 云南绿洲节水灌溉有限责任公司 | A kind of over-voltage over-current protection valve for drip irrigation pipe |
| CN106441918A (en) * | 2016-09-12 | 2017-02-22 | 中国人民解放军国防科学技术大学 | Apparatus for generating fluctuating counter pressure in air inlet test |
| CN107228109A (en) * | 2017-06-23 | 2017-10-03 | 江苏科技大学 | A kind of ball-valve type flutter generator |
| CN111503059A (en) * | 2020-04-10 | 2020-08-07 | 上海交通大学 | Inlet airflow pulsation adjusting device of centrifugal compressor |
| CN111375499A (en) * | 2020-04-21 | 2020-07-07 | 合肥工业大学 | Pulse gas jet generating device with adjustable excitation frequency and duty ratio |
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Application publication date: 20210625 |
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