CN113358310B - Vortex vibration testing device - Google Patents
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- CN113358310B CN113358310B CN202110621279.5A CN202110621279A CN113358310B CN 113358310 B CN113358310 B CN 113358310B CN 202110621279 A CN202110621279 A CN 202110621279A CN 113358310 B CN113358310 B CN 113358310B
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Abstract
A vortex vibration testing device comprises a first wind power module, a second wind power module, a control unit and a main beam segment model; the first wind power module comprises a fan, an air suction port, an air blowing port, a control valve, an air filter, a main pipeline, a first group of branches and a first group of branch switches; the second wind power module comprises a second fan, a second air blowing port, a second air suction port, a second air filter, a second main pipeline, a second group of branches, a second control valve and a second group of branch switches, and the main beam section model comprises an edge, a cross section, an outer pipeline, an air suction port, an air blowing port, an inner pipeline, an anemometer and an acceleration sensor; the blowing and sucking through the blowing port, the sucking port affects the air flow blown towards the edge.
Description
Technical Field
The invention relates to the field of bridge vortex vibration experiments, in particular to a vortex vibration testing device.
Background
With the continuous increase of bridge span, wind-induced vibration gradually becomes a main factor restricting the further development of the large-span bridge. Vortex vibration is a self-limiting wind-induced vibration phenomenon with both forced and self-excited characteristics, caused by regular vortex shedding that occurs when an air stream flows over a structure surface. The Bridge girder vortex vibration phenomenon is quite rare in practical engineering, for example, the nitrey cross-sea Bridge (Rio-nitroi Bridge) in brazil, the Tokyo Bay Bridge (Trans-Tokyo Bay Bridge) in japan, the big bell Bridge (Great East Belt Bridge) in denmark, the Volga river Bridge (Volga Bridge) in russia, the virazano-Narrows Bridge in the united states, the west ruminant Bridge in china, the tiger Bridge, the psitta Bridge and the like have different vortex-induced vibration phenomena in the operation process. Although the vortex vibration can not directly cause the dynamic instability damage of the bridge, the vortex vibration with larger amplitude can cause larger harm to the safety and the driving comfort of the bridge structure. The steel box girder has great superiority in wind resistance and crossing capacity compared with other section forms, and is becoming the main structural form of a large-span bridge stiffening girder crossing Yangtze river and sea. Due to the influence of high humidity and high temperature difference on the sea, the corrosion problem of the steel box girder is serious, and a good dehumidification system is often required to be configured inside the steel box girder. The regeneration air of the common dehumidifier is taken from the outside of the box and then discharged to the outside of the box, and the air is continuously dehumidified and regenerated by using the drying rotating wheel, thereby achieving the dehumidification effect. As known from the working principle of the dehumidification system, the dehumidification system has the similar characteristics with an active flow control system, and air suction and air blowing are required. Due to the complexity of the cross section flow winding of the bridge, various pneumatic shape optimization measures do not have universality of vortex vibration control and are mainly determined through wind tunnel tests and experiences.
However, in practical use, there are the following problems:
1. the experimental system in the prior art controls the wind power through a valve, however, the wind power in the actual situation is always changeable instantly, and the wind power change situation is too much to simulate one by one.
2. In the valve in the prior art, a composite valve core exists, but the composite valve core is usually an inner valve core which is an auxiliary valve, an outer valve core which is a main valve, and the inner valve core is usually difficult to machine due to the smaller volume of the inner valve core, and the function and the execution area which can be executed by the valve core with small volume are small, so that the effect is influenced.
3. The valve in the prior art can adjust the flow rate through the opening and closing degree, but the opening and closing degree control needs manual or machine control, so that the cost is greatly increased.
4. After the valve core in the prior art is used for a long time, the condition of scaling or maintenance is needed, the valve core needs to be disassembled at the moment, and the procedure is complicated.
5. The valve core through holes in the prior art are often square or round, and the advantages brought by the characteristics of the oval through holes and the matching of the through holes in different shapes are ignored. .
6. In the multi-way rotary valve in the prior art, because the number of the passages is too large, and one passage is added, the gaps between the passages are greatly reduced, the positions reserved for sealing are less, and the difficulty is brought to the processing and the installation of a sealing structure.
7. The prior art valves work with a single drive and there is little dual drive because the support and vibration of the lower drive member is a significant problem with dual drive.
8. The valve for life and industry in the prior art is usually arranged independently, but the valve for experiments is just the opposite, and because the valve for experiments simulates the reality but the proportion is greatly reduced, the valve for experiments has the integration requirement, and the common valve obviously cannot adapt to the integration requirement.
Disclosure of Invention
In order to overcome the above problems, the present invention proposes a solution to solve the above problems simultaneously.
The technical scheme adopted by the invention for solving the technical problems is as follows: a vortex vibration testing device comprises a first wind power module, a second wind power module, a control unit and a main beam segment model; the first wind power module comprises a fan, an air suction port, an air blowing port, a control valve, an air filter, a main pipeline, a first group of branches and a first group of branch switches; the second wind power module comprises a second fan, a second air blowing port, a second air suction port, a second air filter, a second main pipeline, a second group of branches, a second control valve and a second group of branch switches, the main beam section model comprises an edge, a cross section, an outer pipeline, an air suction port, an air blowing port, an inner pipeline, an anemoscope and an acceleration sensor, the edge is provided with the air suction port and the air blowing port, and the edge comprises a left edge and a right edge; the fan sucks air through an air suction port and is connected with the air filter through an air blowing port, the output end of the air filter is connected with the control valve, the output end of the control valve outputs air to the main pipeline, the main pipeline is connected with the first group of branches, a first group of branch switches are arranged on the first group of branches, and the first group of branches are opposite to the left edge; the second set of legs is directly opposite to the right edge; an outer pipeline and an inner pipeline are arranged in the main beam section model; the air suction port is connected with external air suction equipment through an inner pipeline, and the air blowing port is connected with external air blowing equipment through an outer pipeline; the air blowing and air suction through the air blowing port and the air suction port influence the air flow blowing to the edge; the anemoscope and the acceleration sensor are arranged at the bottom of the main beam section model;
The control valve and the second control valve have the same structure and respectively comprise a left valve body, a right valve body, a servo motor, a lifting cover plate, a left pull ring, a motor shaft, a right pull ring, a sensing module, a sealing element, a waveform control sleeve, a main valve core, a threaded cover, a lower driving element, a shock absorption pad, a threaded pipe and a lower output shaft; the waveform control sleeve comprises an outer square hole I, an outer square hole II, an outer elliptical hole I and an outer elliptical hole II; the main valve core comprises an inner square channel and an inner oval channel;
the lifting cover plate is detachably connected with the left valve body and the right valve body, the servo motor outputs power to the motor shaft, the motor shaft is connected with the waveform control sleeve, the waveform control sleeve comprises an upper plate and a sleeve part, the motor shaft is connected with the upper plate, the upper plate is positioned below the lifting cover plate, the main valve core is positioned in the waveform control sleeve, and the lower surface of the main valve core is flush with the lower surface of the sleeve part; the lifting cover plate is provided with a left pull ring and a right pull ring, the sensing module is arranged above the right valve body and comprises a flowmeter and a humidity sensor;
The lower output shaft is connected below the main valve core and driven by the lower driving part, the threaded pipe is connected below the left valve body and the right valve body and surrounds the lower driving part, the lower surface of the lower driving part is flush with the lower surface of the threaded pipe, external threads are arranged on the outer wall of the threaded pipe, the threaded cover comprises internal threads, the external threads are connected with the internal threads in a matched manner, the shock absorption pad is arranged on the threaded cover, and the shock absorption pad is positioned on the lower surface of the lower driving part;
the outer square hole I, the outer elliptical hole I, the outer square hole II and the outer elliptical hole II are sequentially arranged at equal intervals along the peripheral surface of the waveform control sleeve, the heights of the four holes are equal, the widths of the outer square hole I and the outer square hole II are equal to the maximum widths of the outer elliptical hole I and the outer elliptical hole II, the cross-sectional area of the inner square channel is equal to the areas of the outer square hole I and the outer square hole II, the cross-sectional area of the inner square channel is larger than the areas of the outer elliptical hole I and the outer elliptical hole II, the cross-sectional area of the inner elliptical channel is smaller than the areas of the outer elliptical hole I and the outer elliptical hole II, and an included angle of 30 degrees is formed between the axis of the inner square channel and the axis of the inner elliptical channel;
When the first outer square hole and the second outer square hole are communicated with the inner square channel, the flow blocking state is realized, the output wind waveform of the valve is a fixed-quantity waveform at the moment, and when the flow blocking state is realized, the first outer square hole swings back and forth in the circumferential direction to form a periodic rapid change waveform; when the first outer elliptical hole and the second outer elliptical hole are communicated with the inner square channel, the flow is in a second flow state, and when the flow is in the second flow state, the outer elliptical hole swings back and forth in a circumferential direction to form a periodic slow-changing waveform; the first outer square hole and the second outer square hole are in a three-gear flow state when communicated with the inner elliptical channel, the first outer elliptical hole and the second outer elliptical hole are in a three-gear flow state when communicated with the inner elliptical channel, and in the three-gear flow state, the waveform control sleeve rotates at a constant speed so that the valve outputs intermittent wind waveforms.
Further, the lifting cover plate is connected to the left valve body and the right valve body through bolts.
Furthermore, the sealing pieces are arranged on the left valve body and the right valve body.
Further, the lower driving part is a driving motor.
Further, the height of the inner elliptical channel is smaller than that of the first outer elliptical hole.
Further, the maximum width of the inner elliptical channel is smaller than the maximum width of the first outer elliptical hole.
Further, the left valve body and the right valve body are integrally formed.
Further, the threaded pipe is welded below the left valve body and the right valve body.
Furthermore, the main valve element is cylindrical.
Further, the diameter of the main spool is larger than three-quarters of the outer diameter of the wave control sleeve.
The invention has the beneficial effects that:
1. according to the 1 st point provided by the background technology, the matching of the waveform control sleeve and the main valve core is adopted, and the wind power effects of intermittent waves, periodic rapid change waveforms, periodic slow change waveforms and linear waveforms are simulated through the structural design and the matching effect of the waveform control sleeve and the main valve core, so that the types of experimental wind power waveforms are enriched to a greater extent.
2. In the point 2 proposed by the background technology, the inner valve core is used as a main valve core, the outer valve core is used as an auxiliary control valve core, the volume of the inner valve core is larger than that of the outer valve core so as to form main on-off, and the outer valve core is sleeve-shaped and is more flexible.
3. In the 3 rd point proposed for the background art, different through holes are arranged on the inner valve core and the outer valve core, when the two large through holes are communicated, the first flow rate is set, when the outer small through hole is communicated with the inner large through hole, the flow rate is set to be the second flow rate because the flow rate is determined by the smallest through hole, and when the inner small through hole is communicated with any hole, the flow rate is determined by the inner small through hole, and therefore the flow rate is set to be the third flow rate.
4. To the 4 th point that the background art provided, because outer case does not have the bottom plate for the sleeve form, can open the apron and directly take out, take out the back, have great clearance between inner case and the valve body, can not take out and clean through the instrument, do not have before inner case and valve body press close to the problem that can't directly clean still need to take out.
5. In the 5 th point proposed by the background technology, in the rotation process of the rectangular through hole, the change of the through flow is relatively large, and a periodic rapid change waveform is simulated. In the rotating process of the oval through hole, due to the action of the curved surface, the change of the flow rate is relatively slow, a periodic slow change waveform is simulated, the oval height is higher than the round height, the coverage range of the through hole is better enlarged, and the flow area is increased.
6. Aiming at the 6 th point proposed by the background technology, the rectangular through hole on the main valve core is close to the oval through hole instead of 90-degree interval, so that a larger sealing surface is reserved for arranging a sealing structure.
7. To the 7 th point that the background art provided, all set up drive structure from top to bottom at the valve body, and to drive structure's support problem down, set up the connection solenoid with the parcel, set up the screw lid with the support, set up the blotter with the shock attenuation.
8. To the 8 th point that the background art provided, set up the solenoid in the valve body below, the solenoid can be dismantled with the screw lid and be connected, can directly place on the plane when the two is connected, and the valve can be connected to integrated platform through the solenoid when unloading the screw lid on, realizes that the experiment integrates.
Note: the foregoing designs are not sequential, each of which provides a distinct and significant advance in the present invention over the prior art.
Drawings
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a partial cross-sectional view of the main poppet of the valve of the present invention
FIG. 2 is a partial cross-sectional view of a valve waveform control sleeve of the present invention
FIG. 3 is a schematic top view of the valve cartridge of the present invention with a flow-blocking passage
FIG. 4 is a schematic top plan view of the valve cartridge of the present invention
FIG. 5 is a schematic view of the vortex vibration testing apparatus of the present invention
FIG. 6 is a cross-sectional view of a cross-section of the main beam of the present invention with an opening
In the figures, the reference numerals are as follows:
1. the valve comprises a left valve body 2, a right valve body 3, a servo motor 4, a lifting cover plate 5, a left pull ring 6, a motor shaft 7, a right pull ring 8, a sensing module 9, a sealing piece 10, a wave-shaped control sleeve 11, a main valve core 12, a threaded cover 13, a lower driving piece 14, a shock absorption pad 15, a threaded pipe 16, an inner square channel 17, a first outer hole 18, a second outer hole 19, a first outer elliptical hole 20, an inner elliptical channel 21, a second outer elliptical hole 22, a lower output shaft 23, a fan 24, an air suction port 25, an air blowing port 26, a control valve 27, an air filter 28, a main pipeline 29, a first group of branch pipelines 30, a first group of branch switches 31, a second fan 32, a second air blowing port 33, a second air suction port 34, a second air filter 35, a second main pipeline 36, a second group of branch pipelines 37, a second control valve 38, a second group of branch switches 39, a control unit 40, an outer pipeline 41, a main pipeline segment model 42, an air suction port 43, a main pipeline cover plate 8, a left pull ring 6, a right pull ring 9, a sealing piece sealing, Insufflation port 44, inner conduit
Detailed Description
As shown in the figure: a vortex vibration testing device comprises a first wind power module, a second wind power module, a control unit and a main beam segment model; the first wind power module comprises a fan, an air suction port, an air blowing port, a control valve, an air filter, a main pipeline, a first group of branches and a first group of branch switches; the second wind power module comprises a second fan, a second air blowing port, a second air suction port, a second air filter, a second main pipeline, a second group of branches, a second control valve and a second group of branch switches, the main beam section model comprises an edge, a cross section, an outer pipeline, an air suction port, an air blowing port, an inner pipeline, an anemoscope and an acceleration sensor, the edge is provided with the air suction port and the air blowing port, and the edge comprises a left edge and a right edge; the fan sucks air through an air suction port and is connected with the air filter through an air blowing port, the output end of the air filter is connected with the control valve, the output end of the control valve outputs air to the main pipeline, the main pipeline is connected with the first group of branches, a first group of branch switches are arranged on the first group of branches, and the first group of branches are opposite to the left edge; the second set of legs is directly opposite to the right edge; an outer pipeline and an inner pipeline are arranged in the main beam section model; the air suction port is connected with external air suction equipment through an inner pipeline, and the air blowing port is connected with external air blowing equipment through an outer pipeline; the air blowing and air suction through the air blowing port and the air suction port influence the air flow blowing to the edge; the anemoscope and the acceleration sensor are arranged at the bottom of the main beam section model;
The control valve and the second control valve have the same structure and respectively comprise a left valve body, a right valve body, a servo motor, a lifting cover plate, a left pull ring, a motor shaft, a right pull ring, a sensing module, a sealing piece, a waveform control sleeve, a main valve core, a threaded cover, a lower driving piece, a shock pad, a threaded pipe and a lower output shaft; the waveform control sleeve comprises an outer square hole I, an outer square hole II, an outer elliptical hole I and an outer elliptical hole II; the main valve core comprises an inner square channel and an inner oval channel;
the lifting cover plate is detachably connected with the left valve body and the right valve body, the servo motor outputs power to the motor shaft, the motor shaft is connected with the waveform control sleeve, the waveform control sleeve comprises an upper plate and a sleeve part, the motor shaft is connected with the upper plate, the upper plate is positioned below the lifting cover plate, the main valve core is positioned in the waveform control sleeve, and the lower surface of the main valve core is flush with the lower surface of the sleeve part; the lifting cover plate is provided with a left pull ring and a right pull ring, the sensing module is arranged above the right valve body and comprises a flowmeter and a humidity sensor;
The lower output shaft is connected below the main valve core and driven by the lower driving part, the threaded pipe is connected below the left valve body and the right valve body and surrounds the lower driving part, the lower surface of the lower driving part is flush with the lower surface of the threaded pipe, external threads are arranged on the outer wall of the threaded pipe, the threaded cover comprises internal threads, the external threads are connected with the internal threads in a matched manner, the shock absorption pad is arranged on the threaded cover, and the shock absorption pad is positioned on the lower surface of the lower driving part;
the outer square hole I, the outer elliptical hole I, the outer square hole II and the outer elliptical hole II are sequentially arranged at equal intervals along the peripheral surface of the waveform control sleeve, the heights of the four holes are equal, the widths of the outer square hole I and the outer square hole II are equal to the maximum widths of the outer elliptical hole I and the outer elliptical hole II, the cross-sectional area of the inner square channel is equal to the areas of the outer square hole I and the outer square hole II, the cross-sectional area of the inner square channel is larger than the areas of the outer elliptical hole I and the outer elliptical hole II, the cross-sectional area of the inner elliptical channel is smaller than the areas of the outer elliptical hole I and the outer elliptical hole II, and the axis of the inner square channel and the axis of the inner elliptical channel form an included angle of 30 degrees;
When the outer square hole I and the outer square hole II are communicated with the inner square channel, the flow blocking state is realized, the output wind power waveform of the valve is a fixed-quantity waveform at the moment, and when the flow blocking state is realized, the outer square hole I circumferentially swings back and forth to form a periodic sudden change waveform; when the first outer elliptical hole and the second outer elliptical hole are communicated with the inner square channel, the flow is in a second flow state, and when the flow is in the second flow state, the outer elliptical hole swings back and forth in a circumferential direction to form a periodic slow-changing waveform; the first outer square hole and the second outer square hole are in a three-gear flow state when communicated with the inner elliptical channel, the first outer elliptical hole and the second outer elliptical hole are in a three-gear flow state when communicated with the inner elliptical channel, and in the three-gear flow state, the waveform control sleeve rotates at a constant speed so that the valve outputs intermittent wind waveforms.
As shown in the figure: the lifting cover plate is connected to the left valve body and the right valve body through bolts. And the sealing pieces are arranged on the left valve body and the right valve body. The lower driving piece is a driving motor. The height of the inner elliptical channel is smaller than that of the first outer elliptical hole. The maximum width of the inner elliptical channel is smaller than the maximum width of the first outer elliptical hole. The left valve body and the right valve body are integrally formed. The threaded pipe is welded below the left valve body and the right valve body. The main valve core is cylindrical. The diameter of the main valve core is larger than three-quarters of the outer diameter of the waveform control sleeve.
During operation, wind power blowing to the bridge from the side face is simulated through the first wind power module and the second wind power module in an absorbing-blowing (interchangeable mode), the influence of vortex vibration is reduced through the interference wind power of the blowing port and the absorbing-sucking port, the vortex vibration generated by the bridge is identified through the acceleration sensor, and the direction and the size of flowing wind are identified through the anemoscope.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a vortex testing arrangement that shakes which characterized in that: the system comprises a first wind module, a second wind module, a control unit and a main beam section model; the first wind power module comprises a fan, an air suction port, an air blowing port, a control valve, an air filter, a main pipeline, a first group of branches and a first group of branch switches; the second wind power module comprises a second fan, a second air blowing port, a second air suction port, a second air filter, a second main pipeline, a second group of branches, a second control valve and a second group of branch switches, the main beam section model comprises an edge, a cross section, an outer pipeline, an air suction port, an air blowing port, an inner pipeline, an anemoscope and an acceleration sensor, the edge is provided with the air suction port and the air blowing port, and the edge comprises a left edge and a right edge; the fan sucks air through an air suction port and is connected with the air filter through an air blowing port, the output end of the air filter is connected with the control valve, the output end of the control valve outputs air to the main pipeline, the main pipeline is connected with the first group of branches, a first group of branch switches are arranged on the first group of branches, and the first group of branches are opposite to the left edge; the second set of legs is directly opposite to the right edge; an outer pipeline and an inner pipeline are arranged in the main beam section model; the air suction port is connected with external air suction equipment through an inner pipeline, and the air blowing port is connected with external air blowing equipment through an outer pipeline; the air blowing and air suction through the air blowing port and the air suction port influence the air flow blowing to the edge; the anemoscope and the acceleration sensor are arranged at the bottom of the main beam section model;
The control valve and the second control valve have the same structure and respectively comprise a left valve body, a right valve body, a servo motor, a lifting cover plate, a left pull ring, a motor shaft, a right pull ring, a sensing module, a sealing piece, a waveform control sleeve, a main valve core, a threaded cover, a lower driving piece, a shock pad, a threaded pipe and a lower output shaft; the waveform control sleeve comprises an outer square hole I, an outer square hole II, an outer elliptical hole I and an outer elliptical hole II; the main valve core comprises an inner square passage and an inner oval passage;
the lifting cover plate is detachably connected with the left valve body and the right valve body, the servo motor outputs power to the motor shaft, the motor shaft is connected with the waveform control sleeve, the waveform control sleeve comprises an upper plate and a sleeve part, the motor shaft is connected with the upper plate, the upper plate is positioned below the lifting cover plate, the main valve core is positioned in the waveform control sleeve, and the lower surface of the main valve core is flush with the lower surface of the sleeve part; the lifting cover plate is provided with a left pull ring and a right pull ring, the sensing module is arranged above the right valve body and comprises a flowmeter and a humidity sensor;
The lower output shaft is connected below the main valve core and driven by the lower driving part, the threaded pipe is connected below the left valve body and the right valve body and surrounds the lower driving part, the lower surface of the lower driving part is flush with the lower surface of the threaded pipe, external threads are arranged on the outer wall of the threaded pipe, the threaded cover comprises internal threads, the external threads are connected with the internal threads in a matched manner, the shock absorption pad is arranged on the threaded cover, and the shock absorption pad is positioned on the lower surface of the lower driving part;
the outer square hole I, the outer elliptical hole I, the outer square hole II and the outer elliptical hole II are sequentially arranged at equal intervals along the peripheral surface of the waveform control sleeve, the heights of the four holes are equal, the widths of the outer square hole I and the outer square hole II are equal to the maximum widths of the outer elliptical hole I and the outer elliptical hole II, the cross-sectional area of the inner square channel is equal to the areas of the outer square hole I and the outer square hole II, the cross-sectional area of the inner square channel is larger than the areas of the outer elliptical hole I and the outer elliptical hole II, the cross-sectional area of the inner elliptical channel is smaller than the areas of the outer elliptical hole I and the outer elliptical hole II, and the axis of the inner square channel and the axis of the inner elliptical channel form an included angle of 30 degrees;
When the first outer square hole and the second outer square hole are communicated with the inner square channel, the flow blocking state is realized, the output wind waveform of the valve is a fixed-quantity waveform at the moment, and when the flow blocking state is realized, the first outer square hole swings back and forth in the circumferential direction to form a periodic rapid change waveform; when the first outer elliptical hole and the second outer elliptical hole are communicated with the inner square channel, the flow is in a second flow state, and when the flow is in the second flow state, the outer elliptical hole swings back and forth in a circumferential direction to form a periodic slow-changing waveform; the first outer square hole and the second outer square hole are in a three-gear flow state when communicated with the inner elliptical channel, the first outer elliptical hole and the second outer elliptical hole are in a three-gear flow state when communicated with the inner elliptical channel, and in the three-gear flow state, the waveform control sleeve rotates at a constant speed so that the valve outputs intermittent wind waveforms.
2. The vortex vibration testing apparatus according to claim 1, wherein: the lifting cover plate is connected to the left valve body and the right valve body through bolts.
3. The vortex vibration testing apparatus according to claim 1, wherein: and the sealing pieces are arranged on the left valve body and the right valve body.
4. The vortex vibration testing apparatus according to claim 1, wherein: the lower driving piece is a driving motor.
5. The vortex vibration testing apparatus according to claim 1, wherein: the height of the inner elliptical channel is smaller than that of the first outer elliptical hole.
6. The vortex vibration testing apparatus according to claim 1, wherein: the maximum width of the inner elliptical channel is smaller than the maximum width of the first outer elliptical hole.
7. The vortex vibration testing apparatus according to claim 1, wherein: the left valve body and the right valve body are integrally formed.
8. The vortex vibration testing apparatus according to claim 1, wherein: the threaded pipe is welded below the left valve body and the right valve body.
9. The vortex vibration testing apparatus according to claim 1, wherein: the main valve core is cylindrical.
10. The vortex vibration testing apparatus according to claim 1, wherein: the diameter of the main valve core is larger than three-quarters of the outer diameter of the waveform control sleeve.
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