CN113251152B - Improved generation reduces separation vortex anti-cavitation valve - Google Patents
Improved generation reduces separation vortex anti-cavitation valve Download PDFInfo
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- CN113251152B CN113251152B CN202110471911.2A CN202110471911A CN113251152B CN 113251152 B CN113251152 B CN 113251152B CN 202110471911 A CN202110471911 A CN 202110471911A CN 113251152 B CN113251152 B CN 113251152B
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- 238000000926 separation method Methods 0.000 title claims abstract description 24
- 239000012530 fluid Substances 0.000 claims abstract description 45
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 230000006835 compression Effects 0.000 claims description 30
- 238000007906 compression Methods 0.000 claims description 30
- 230000007423 decrease Effects 0.000 claims 1
- 230000003628 erosive effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000005192 partition Methods 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 5
- 238000004088 simulation Methods 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/10—Influencing flow of fluids around bodies of solid material
- F15D1/12—Influencing flow of fluids around bodies of solid material by influencing the boundary layer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/10—Drag reduction
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Lift Valve (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses an improved separation vortex cavitation-resistant valve, which comprises a valve body, wherein an overflow cavity for fluid to pass through is formed in the valve body, a rotatable valve shaft positioned on the overflow path of the overflow cavity is also arranged in the valve body, a butterfly valve is fixed on the valve shaft, and the butterfly valve is driven to synchronously rotate while rotating so as to control the opening and closing of the overflow cavity; the butterfly valve is of an airfoil shape, an active jet flow cavity which is recessed from the wing surface of the butterfly valve into the butterfly valve is formed in the butterfly valve along the direction of a parallel valve shaft, an opening of the active jet flow cavity on the surface of the butterfly valve is a jet flow outlet, the jet flow outlet faces the same as the flow direction of fluid in the valve body, a jet flow inlet penetrating through one wing end of the butterfly valve is arranged in the active jet flow cavity along the direction of the parallel valve shaft, and the jet flow inlet is communicated with an active jet flow source. The invention improves the uniformity and the stability of the overflow distribution of the butterfly valve, prevents cavitation erosion, reduces the noise of the butterfly valve during use and improves the service performance of the butterfly valve.
Description
Technical Field
The invention relates to the field of hydraulic machinery, in particular to an improved valve for reducing separation vortex cavitation resistance.
Background
The butterfly valve is widely applied to flow control in domestic water pipelines, slurry medium pipelines and ventilation pipelines due to the characteristics of simple structure, small mass, small opening and closing moment, high opening and closing speed and the like, can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive mediums, slurry, oil products, liquid metal, radioactive mediums and the like, and mainly plays roles of cutting and throttling on the pipelines.
Butterfly valves are often applied to large-caliber channels, so that the hydrodynamic performance of a butterfly valve opening and closing member in the butterfly valve greatly influences the actual service performance of the butterfly valve. The traditional butterfly valve opening and closing part is a disc-shaped butterfly plate, when a large flow passes through, larger resistance can be generated, the butterfly valve is uneven in overcurrent distribution and poor in stability, cavitation erosion is easy to form when the butterfly valve is operated under the working condition for a long time, the wall surface of the butterfly valve opening and closing part is damaged, vibration noise is induced, and the service performance of the butterfly valve is seriously affected, so that the problem needs to be solved.
Disclosure of Invention
In order to avoid and overcome the technical problems in the prior art, the invention provides the improved separation vortex cavitation-resistant valve, which improves the uniformity and the stability of the overflow distribution of the butterfly valve, prevents cavitation, reduces the noise of the butterfly valve during use and improves the service performance of the butterfly valve.
In order to achieve the above purpose, the present invention provides the following technical solutions:
an improved generation reduces separation vortex anti-cavitation valve, including the valve body, offer the overflow chamber that supplies the fluid to pass through in the valve body, still is provided with the rotatable valve shaft located on the overflow chamber and overflows the flow path in the valve body, is fixed with the butterfly flap on the valve shaft, drive the butterfly flap to rotate in step in order to control opening and closing of the overflow chamber while rotating the valve shaft;
the butterfly valve is in an airfoil shape, an active jet cavity which is recessed from the wing surface of the butterfly valve into the butterfly valve is arranged in the butterfly valve along the direction of a parallel valve shaft, an opening of the active jet cavity on the surface of the butterfly valve is a jet outlet, the jet outlet faces the same as the flow direction of fluid in the valve body, a jet inlet penetrating through one wing end of the butterfly valve is arranged in the active jet cavity along the direction of the parallel valve shaft, and the jet inlet is communicated with an active jet source; and the flow straightening tip which is positioned between the jet inlet and the jet outlet and used for prolonging the fluid flow path is convexly arranged in the active jet cavity, and the flow passing area in the active jet cavity is gradually reduced along the fluid flow direction.
As a further scheme of the invention: the butterfly valve is a single-wing valve clack or double-wing valve clacks symmetrically arranged on two sides of the valve shaft.
As still further aspects of the invention: the active jet cavity is arranged on one wing surface of the butterfly valve or symmetrically arranged on wing surfaces on two sides of the butterfly valve.
As still further aspects of the invention: the active jet cavity is internally provided with a rectifying section which is positioned on the active jet flow path and cuts off the path along the direction of a parallel valve shaft, the rectifying section is provided with rectifying holes for fluid to pass through, and the distance between every two adjacent rectifying holes is gradually increased along the direction away from a jet inlet.
As still further aspects of the invention: the rectifying section is a rectifying tube, the rectifying tube is matched with the jet inlet in shape, and the rectifying tube is inserted into the precompression cavity along the jet inlet and fixed; the active jet cavity is a curved cavity, and the cross section of the active jet cavity is in a hook shape; the total area of the holes of the rectifying holes is smaller than the area of the jet inlet.
As still further aspects of the invention: the rectifying pin extends from the butterfly valve wing surface into the active jet cavity along the incoming flow direction in the valve body; the rectification tip divides the active jet cavity into a precompression cavity, a transitional compression cavity and a jet compression cavity which are sequentially arranged along the fluid flow direction, a gap between the rectification tip end part and the active jet cavity is the transitional compression cavity, and the precompression cavity is communicated with the jet inlet.
As still further aspects of the invention: the jet flow compression cavity is internally provided with a runner partition plate which divides the jet flow compression cavity into at least two runners along the direction parallel to the valve shaft.
As still further aspects of the invention: the valve shaft is convexly provided with a guide bulge, a limit groove matched with the guide bulge is formed in the valve body so as to limit the maximum rotation amplitude of the valve shaft to ninety degrees, and when the valve shaft is positioned at an initial rotation point, the butterfly valve just completely blocks the overflow cavity; one end of the valve shaft extends out of the valve body and is connected with the adjusting hand wheel so as to control the rotation of the adjusting hand wheel.
As still further aspects of the invention: the active jet flow source is an active jet flow channel arranged in the valve shaft, one end of the active jet flow channel extends into the butterfly valve and is communicated with the jet flow inlet, and the other end of the active jet flow channel extends out of the valve body and is communicated with the drainage tube to introduce the fluid source.
As still further aspects of the invention: the active jet cavity is composed of a first curved surface, a second curved surface, a third curved surface, a fourth curved surface, a fifth curved surface, a sixth curved surface and a seventh curved surface which are sequentially connected, wherein a gap between the first curved surface and the seventh curved surface is a jet outlet;
the cross-sectional curve of the first curved surface is a cubic curve,
wherein: -7-6; b is more than or equal to 6 and less than or equal to 7; -2-1 and-2; d is more than or equal to 0 and less than or equal to 1;
the cross-section curve of the second curved surface is a cubic curve,
wherein: -920 < e < minus 900; f is more than or equal to 1200 and less than or equal to 1220; -530-520 g; h is more than or equal to 75 and less than or equal to 80;
the section curve of the third curved surface is a cubic curve,
wherein: -45-40; -45-40; -15-20 and k-15; -2 is less than or equal to l is less than or equal to-1;
the cross-section curve of the fourth curved surface is a cubic curve,
wherein: -155-145 and m-145; n is more than or equal to 140 and less than or equal to 145; -50-40; p is more than or equal to 4 and less than or equal to 5;
the section curve of the fifth curved surface is a cubic curve,
wherein: q is more than or equal to 20 and less than or equal to 25; -25-20; s is more than or equal to 8 and less than or equal to 10; -2 is less than or equal to t is less than or equal to-1;
wherein the boundary conditions are:
x 1 ＝3.10 y 1 ＝0.75
x 5 ＝2.65 y 5 ＝0.29
x 1 ＝x 2 ＝2.36 y 1 ＝y 2 ＝0.53
x 2 ＝x 3 ＝2.17 y 2 ＝y 3 ＝0.19
x 3 ＝x 4 ＝2.99 y 3 ＝y 4 ＝-0.45
x 4 ＝x 5 ＝3.58 y 4 ＝y 5 ＝0
the section curve of the sixth curved surface is an arc curve, the chord length of the butterfly valve is L, and the radius of the arc curve of the sixth curved surface is 0.007L;
the cross-section curve of the seventh curved surface is a cubic curve, and the overflow area of the jet outlet between the seventh curved surface and the first curved surface is linearly reduced by 1.2 times along the fluid flow direction.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the butterfly valve, the butterfly valve is designed to be of an airfoil structure, so that the resistance of large-flow fluid passing through is reduced; meanwhile, an active jet cavity is formed in the surface of the butterfly valve to perform energy compensation on the surface of the butterfly valve so as to improve the lift coefficient of the wing surface of the butterfly valve; the flow straightening tip is arranged in the active jet cavity in a protruding mode so that the flow straightening tip is transversely spanned between the jet inlet and the jet outlet, a straight-line flow track of fluid from the jet inlet to the jet outlet is changed into an arc-shaped flow track which is wound around the flow straightening tip, the flow distance of the fluid is prolonged in a limited space of the active jet cavity, meanwhile, through separation of the flow straightening tip, the flow passing area along the flow direction of the fluid to the active jet cavity is gradually reduced, after the active jet source shoots fluid with a certain speed into the active jet cavity, the fluid is continuously compressed in the cavity, and the speed uniformity of the fluid after being shot is improved; the flow distance of the fluid in the limited space is prolonged, so that the flow time is prolonged, the full compression diffusion time is obtained in the active jet cavity, the fluid is distributed more uniformly in the valve body after leaving the jet outlet, the area of a vortex area at the upstream of the jet outlet is reduced, the vortex area at the downstream of the jet outlet is reduced, the flow separation capacity of the wing surfaces of the butterfly valve is inhibited, the separation point is closer to the tail edge of the butterfly valve, compared with the common active jet structure, the negative pressure area is larger, cavitation is prevented, the overflow in the valve body is more uniform, the stability of the overflow is improved, the lift coefficient of the butterfly valve is obviously improved, the working efficiency of the valve body is improved, the working noise of the valve body is reduced, and the service life of the butterfly valve is prolonged.
2. The rectifying section and the surface rectifying holes of the rectifying section uniformly compensate streamline of the butterfly valve airfoil, so that the streamline is uniformly distributed, the lift coefficient of the butterfly valve is further improved, and the airfoil is subjected to energy compensation.
3. The rectifying pin extends from the butterfly valve airfoil surface into the active jet cavity, the active jet cavity is artificially divided into a precompression cavity for inflow, a jet compression cavity for outflow and a transitional compression cavity for transitional action in the middle of the jet compression cavity; due to the separation of the rectifying tips and the matching of the rectifying tips and the cavity walls, the fluid is continuously compressed through each cavity along the fluid flow direction, and finally uniformly diffused and ejected.
4. According to the invention, the rectifying tube which is matched with the jet inlet in size is inserted into the active jet cavity, and the fluid is distributed and compressed before entering the active jet cavity, so that the fluid is uniformly distributed after entering the active jet cavity, and the subsequent bypass phenomenon is prevented; and by designing the total area of the rectifying holes to be smaller than the area of the jet inlet, the fluid can be pre-compressed before entering the active jet cavity, so that the fluid flows uniformly.
5. The flow passage partition plate is arranged in the jet flow compression cavity to divide the jet flow outlet into a plurality of flow passages, so that the uniformity of fluid injection is improved, and the flow passage partition plate has the thickness, so that the function of compressing the flow passage area is achieved, and the fluid is continuously compressed in the fluid injection process.
6. The arrangement of the single-wing valve clack and the double-wing valve clack provides various application choices for different working conditions; the guide protrusion is matched with the limit groove, so that the maximum rotation amplitude of the valve shaft is limited to ninety degrees, and the flow area of the flow passage cavity is regulated from 0 to the maximum in the rotation range of 0-90 degrees; the arrangement of the active jet channel facilitates the introduction of an external fluid source to introduce an active jet of a certain flow rate into the active jet cavity.
7. According to the invention, the active jet cavity is subjected to specific parameterization setting, so that the parameters are optimized, and the processing is more convenient.
Drawings
FIG. 1 is a schematic view of the valve of the present invention when closed.
Fig. 2 is a schematic view of the structure of the valve of the present invention when opened.
FIG. 3 is a three-dimensional schematic of a first embodiment of a butterfly valve in accordance with the invention.
Fig. 4 is a front view of a first embodiment of a butterfly valve in accordance with the invention.
Fig. 5 is a cross-sectional view of a first embodiment of a butterfly valve in accordance with the invention.
FIG. 6 is a three-dimensional schematic of a second embodiment of a butterfly valve in accordance with the invention.
Fig. 7 is a front view of a second embodiment of a butterfly valve in accordance with the invention.
Fig. 8 is a cross-sectional view of a second embodiment of a butterfly valve in accordance with the invention.
Fig. 9 is an enlarged schematic view at Z in fig. 5.
Fig. 10 is a cross-sectional view of an active jet cavity.
Fig. 11 is a cross-sectional view of the active jet cavity after insertion of the rectifier tube.
Fig. 12 is a schematic structural diagram of the rectifying tube.
Fig. 13 is a cross-sectional view of the rectifier tube.
FIG. 14 is a diagram of a butterfly valve surface vortex profile without active jet structure.
FIG. 15 is a diagram of a butterfly valve surface swirl profile with a conventional active jet configuration.
FIG. 16 is a diagram of a butterfly valve surface swirl profile with an active jet configuration of the present invention.
FIG. 17 is a diagram of a butterfly valve surface vortex profile with an active jet structure of the present invention with a rectifier tube inserted therein.
FIG. 18 is a simulation of streamlines of a butterfly valve surface with a conventional active jet structure.
FIG. 19 is a schematic view of a streamline simulation of a butterfly valve surface with an active jet structure of the present invention.
FIG. 20 is a schematic view of a streamline simulation of a butterfly valve surface with an active jet structure of the present invention and a rectifier tube inserted therein.
In the figure: 1. a valve body; 2. a drainage tube; 3. an adjusting hand wheel; 4. a flow-through cavity; 5. a valve shaft; 6. an active jet channel; 10. butterfly valve; 20. an active jet cavity; 201. a flow passage partition plate; 202. a rectifying tip; 203. rectifying tube; 2031. jet holes; 2041. a first curved surface; 2042. a second curved surface; 2043. a third curved surface; 2044. a fourth curved surface; 2045. a fifth curved surface; 2046. a sixth curved surface; 2047. a seventh curved surface; u, precompression chamber; v, a transitional compression cavity; w, jet compression chamber.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 20, an improved vortex-reducing cavitation-resisting valve for separation in the embodiment of the invention comprises a valve body 1, wherein an overflow cavity 4 is formed in the valve body 1 for fluid to pass through, a rotatable valve shaft 5 positioned on the overflow path of the overflow cavity 4 is arranged in the valve body 1, and a butterfly valve 10 is fixed on the valve shaft 5.
The butterfly valve 10 is divided into a double-wing valve flap as shown in fig. 3, 4 and 5 and a single-wing valve flap as shown in fig. 6, 7 and 8. When the butterfly valve 10 is a double-wing valve clack, the butterfly valve 10 is symmetrically arranged at two sides of the valve shaft 5; when the butterfly valve 10 is a single-wing valve flap, the valve shaft 5 is located at the center of the butterfly valve 10 and is symmetrical about the valve shaft 5 itself. Fig. 1 and 2 in the present invention are schematic diagrams of the butterfly valve 10 as a double-wing valve.
The butterfly valve 10 is in an airfoil shape, and an active jet cavity which is recessed from the airfoil surface of the butterfly valve 10 into the butterfly valve 10 is arranged in the butterfly valve 10 along the direction of a parallel axis valve. Thin walls exist at the wing ends of the two sides of the butterfly valve 10 to seal the two ends of the active jet cavity 20, and the thickness of the thin walls is negligible.
The number of active jet chambers 20 arranged is not limited. When the butterfly valve 10 is a single-wing valve clack, the active jet cavities 20 can be arranged on one side surface of the butterfly valve 10, or symmetrically arranged on the wing surfaces on two sides of the butterfly valve 10, the number of the active jet cavities arranged on each side surface is not limited, and a group of active jet cavities 20 are preferably arranged at the upstream end of each side surface; when the butterfly valve 10 is a double-wing valve clack, the active jet cavities 20 can be respectively arranged on the butterfly valve 10 at two sides of the valve shaft 5, and the active jet cavity 20 can be arranged at one side or two side wing surfaces of each butterfly valve 10. When the butterfly valve 10 is fully opened, the jet outlet of each active jet cavity 20 on each butterfly valve 10 faces the same direction as the fluid flow direction in the valve body.
The valve shaft 5 is convexly provided with a guide bulge (not shown in the figure), a limit groove matched with the guide bulge is formed in the valve body 1 so as to limit the maximum rotation amplitude of the valve shaft 5 to ninety degrees, and when the valve shaft 5 is positioned at an initial rotation point, the butterfly valve 10 just completely blocks the overflow cavity 4; one end of the valve shaft 5 extends outside the valve body 1 and is connected to the regulating hand wheel 3 for controlling the rotation thereof.
The active jet source is an active jet channel 6 arranged in the valve shaft 5, one end of the active jet channel 6 extends into the butterfly valve 10 and is communicated with the jet inlet, and the other end extends out of the valve body 1 and is communicated with the drainage tube 2 to introduce a fluid source.
The active jet cavity 20 is a smooth curved surface; the surface of the butterfly valve 10 extends into the active jet cavity 20 along the incoming flow direction in the valve body 1 to form an arc rectifying tip 202, and the rectifying tip 202 extends into the active jet cavity 20 to enable the active jet cavity 20 to be in a hook shape.
The flow path of the active jet in the active jet cavity 20 changes from a straight line to an arc due to the separation of the rectifying tips 202, the flow path is prolonged, and the flow area of the active jet cavity 20 is gradually reduced along the fluid flow direction due to the existence of the rectifying tips 202.
The opening of the active jet cavity 20 positioned on the wing surface of the butterfly valve 10 is a jet outlet.
After the rectifying pin 202 stretches into the active jet cavity 20, the active jet cavity 20 is divided into a precompression cavity u, a transitional compression cavity v and a jet compression cavity w which are sequentially arranged along the flow direction of the active jet, a gap between the rectifying pin 202 and the active jet cavity 20 is the transitional compression cavity v, the jet compression cavity w is a tail section of the active jet cavity 20 and is connected with the wing surface of the butterfly valve 10, and fluid is finally ejected from a jet outlet of the jet compression cavity w.
One side of the butterfly valve 10 is provided with an opening on the thin wall of the closed active jet cavity 20, the opening is communicated with the precompression cavity u, the opening is a jet inlet, the jet inlet is communicated with an active jet source, the active jet source provides active jet with a certain jet speed from the jet inlet into the active jet cavity 20, and the incoming flow speed in the valve body 1 is V 1 The jet velocity of the active jet source is V 2 ，0.3V 2 ≤V 1 ≤1.5V 2 。
The jet inlet is not limited in shape, and is preferably a circular jet inlet; the rectifier 203 having the same shape as the jet inlet is inserted into the jet inlet, and after the end of the rectifier 203 away from the jet inlet is abutted against the cavity wall of the active jet cavity 20, the rectifier 203 is fixed in any manner, for example, by welding or riveting. Jet holes 2031 are formed in the pipe body of the rectifying pipe 203, the jet holes 2031 are arranged at intervals along the length direction of the rectifying pipe 203, and the distance between every two adjacent jet holes 2031 is gradually increased along the direction away from the jet inlet. Since the rectifier 203 is located in the flow path of the active jet, the active jet must enter the precompression chamber u through the jet orifice 2031 in the rectifier 203 after entering the jet inlet.
However, the rectifying tube 203 is not the only choice, and by inserting a rectifying plate from the jet inlet and fixing it, it spans between the precompression chamber u and the transitional compression chamber v, and arranging rectifying holes at intervals on the plate body, keeping the distance between adjacent rectifying holes gradually increasing along the direction away from the jet inlet, it can function as the rectifying tube 203.
To ensure a compression function on the fluid, the total area of the holes in the rectifying tube 203 or the rectifying plate is smaller than the area of the jet inlet.
In order to further improve the compression and rectification performance of the jet compression chamber w, a flow passage partition plate 201 is provided in the jet compression chamber w to partition the jet compression chamber w into a plurality of flow passages. Preferably, the jet outlets of the jet compression cavity w are uniformly divided into three flow channels.
The active jet cavity 20 is specifically formed by a first curved surface 2041, a second curved surface 2042, a third curved surface 2043, a fourth curved surface 2044, a fifth curved surface 2045, a sixth curved surface 2046, and a seventh curved surface 2047 that are sequentially connected, and a gap between the first curved surface 2041 and the seventh curved surface 2047 is a jet outlet of the jet compression cavity w, which is specifically described below.
The active jet cavity 20 is cut along the chord length direction of the butterfly valve 10, the section curve of the first curved surface 2041 is a cubic curve,
-7≤a≤-6；6≤b≤7；-2≤c≤-1；0≤d≤1；
the cross-sectional curve of the second curved surface 2042 is a cubic curve,
-920≤e≤-900；1200≤f≤1220；-530≤g≤-520；75≤h≤80；
the cross-sectional curve of the third curved surface 2043 is a cubic curve,
-45≤i≤-40；-45≤j≤-40；-15≤k≤-20；-2≤l≤-1；
the cross-sectional curve of the fourth curved surface 2044 is a cubic curve,
-155≤m≤-145；140≤n≤145；-50≤o≤-40；4≤p≤5；
the cross-sectional curve of the fifth curved surface 2045 is a cubic curve,
20≤q≤25；-25≤r≤-20；8≤s≤10；-2≤t≤-1；
wherein the boundary conditions are:
x 1 ＝3.10 y 1 ＝0.75
x 5 ＝2.65 y 5 ＝0.29
x 1 ＝x 2 ＝2.36 y 1 ＝y 2 ＝0.53
x 2 ＝x 3 ＝2.17 y 2 ＝y 3 ＝0.19
x 3 ＝x 4 ＝2.99 y 3 ＝y 4 ＝-0.45
x 4 ＝x 5 ＝3.58 y 4 ＝y 5 ＝0
the cross-sectional curve of the sixth curved surface 2046 is a circular arc curve, the chord length of the butterfly valve 10 is L, the radius of the circular arc curve of the sixth curved surface is 0.007L, and the circular arc is a semicircle.
The cross-sectional curve of the seventh curved surface 2047 is a cubic curve, and the flow area of the jet outlet between the seventh curved surface 2047 and the first curved surface 2041 is linearly reduced by 1.2 times along the active jet flow direction. Flow area S along the fluid flow direction at the end of the single flow channel of the jet outlet 1 Is 0.04mm 2 -0.16mm 2 The flow area of the initial end of the single flow channel is S 2 Is 2.5S 1 -4S 1 。
Since the flow-through area is determined in a linear relationship and the first curved surface 2041 is also known, the cross-sectional curve of the seventh curved surface 2047 can be obtained from the cross-sectional curve of the first curved surface 2041.
FIGS. 14-17 are swirl profiles of an airfoil of the airfoil butterfly 10 (simulated with a single-vane side having an active jet cavity);
as shown in FIG. 14, the airfoil of a conventional butterfly valve presents a large number of vortices.
As shown in FIG. 15, the butterfly valve 10 with the conventional active jet structure has a reduced vortex area of the airfoil, but a large number of vortices are still present at the jet outlet of the airfoil.
As shown in FIG. 16, the butterfly valve 10 with the active jet structure of the invention has the advantages that compared with the common jet structure, the area of the vortex area at the upstream of the jet outlet of the airfoil is obviously reduced, the area of the vortex area at the jet outlet is obviously reduced, the vortex area at the downstream of the jet outlet is wholly moved downwards, namely the separation point is moved downwards, the jet obviously inhibits the capability of the airfoil to flow and separate, so that the separation point is closer to the tail edge of the airfoil, and compared with the common active jet structure, the butterfly valve has a larger negative pressure area, and the lift coefficient of the butterfly valve 10 is obviously improved.
As shown in fig. 17, in the butterfly valve 10 with the active jet structure, a rectifying tube is further inserted into the active jet cavity, so that the scroll area downstream of the jet outlet is larger in downward movement amplitude, the scroll area upstream of the jet outlet is larger in reduction amplitude, and the overall lift coefficient is improved more.
FIGS. 18-20 are streamline simulations of the airfoil of the butterfly valve 10 (simulated with a single-winged butterfly valve side having an active jet cavity);
as shown in FIG. 18, with airfoils having a butterfly flap of a conventional active jet configuration, the jet accumulates away from the jet inlet, and flows around from away from the jet inlet, and only a small amount of fluid near the jet inlet energy compensates the airfoil, due to the inability of the fluid to adequately diffuse in the active jet configuration.
As shown in FIG. 19, the butterfly valve with the active jet structure has the advantages that streamline lines of the airfoil are uniformly distributed along the extending direction of the butterfly valve 10, vortex flow is effectively inhibited, jet flow obviously inhibits the flow separation capacity of the airfoil of the butterfly valve, so that a separation point is closer to the tail edge of the downstream of the airfoil of the butterfly valve, and the lift coefficient is improved.
As shown in fig. 20, in the butterfly valve with the active jet structure of the present invention, after the rectifying tube is inserted, the partial vortex area at the downstream of the jet outlet is further eliminated, so that the lift coefficient of the butterfly valve is further improved.
Numerical simulation tests are respectively carried out on a common butterfly valve, a common butterfly valve comprising a common jet structure, a common butterfly valve comprising the jet structure, and a common butterfly valve with a rectifying tube inserted in the jet structure according to the invention, according to an attack angle of 8 degrees, an incoming flow speed of 10m/s and an active jet source jet speed of 5m/s, and the results of the rising resistance coefficients of the four schemes are shown in the following table:
the common active jet structure can be found that the lift coefficient is slightly improved while the resistance coefficient is greatly reduced, and the lift coefficient of the butterfly valve airfoil is greatly improved while the resistance coefficient is basically unchanged after the original common active jet structure is replaced by the active jet structure, so that the energy loss of the airfoil is effectively compensated. After the rectifying tube is inserted into the active jet structure, the lift coefficient is improved again, and the resistance coefficient is maintained stable.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (8)
1. The improved generation reduces separation vortex anti-cavitation valve, which is characterized by comprising a valve body (1), wherein an overflow cavity (4) for fluid to pass through is formed in the valve body (1), a rotatable valve shaft (5) positioned on an overflow path of the overflow cavity (4) is also arranged in the valve body (1), a butterfly valve (10) is fixed on the valve shaft (5), and the butterfly valve (10) is driven to synchronously rotate while the valve shaft (5) rotates so as to control the opening and closing of the overflow cavity (4);
the butterfly valve is characterized in that the butterfly valve (10) is in an airfoil shape, an active jet flow cavity (20) which is recessed from the airfoil surface of the butterfly valve (10) into the butterfly valve (10) is formed in the butterfly valve (10) along the direction of the parallel valve shaft (5), an opening of the active jet flow cavity (20) on the surface of the butterfly valve (10) is a jet flow outlet, the jet flow outlet faces the direction same as the flow direction of the fluid in the valve body (1), and a jet flow inlet penetrating through one wing end of the butterfly valve (10) is arranged in the direction of the parallel valve shaft (5) in the active jet flow cavity (20), and the jet flow inlet is communicated with an active jet flow source; the active jet cavity (20) is internally provided with a rectifying pin (202) which is positioned between the jet inlet and the jet outlet and used for prolonging the flow path of the active jet, and the overflow area in the active jet cavity (20) is gradually reduced along the flow direction of the active jet;
a rectifying section which is positioned on the active jet flow path and cuts off the path is arranged in the active jet flow cavity (20) along the direction of the parallel valve shaft (5), rectifying holes for fluid to pass through are formed in the rectifying section, and the distance between every two adjacent rectifying holes is gradually increased along the direction away from the jet flow inlet;
the active jet cavity (20) is composed of a first curved surface (2041), a second curved surface (2042), a third curved surface (2043), a fourth curved surface (2044), a fifth curved surface (2045), a sixth curved surface (2046) and a seventh curved surface (2047) which are sequentially connected, wherein a gap between the first curved surface (2041) and the seventh curved surface (2047) is a jet outlet;
the cross-section curve of the first curved surface (2041) is a cubic curve,
wherein: -7-6; b is more than or equal to 6 and less than or equal to 7; -2-1 and-2; d is more than or equal to 0 and less than or equal to 1;
the cross-section curve of the second curved surface (2042) is a cubic curve,
wherein: -920 < e < minus 900; f is more than or equal to 1200 and less than or equal to 1220; -530-520 g; h is more than or equal to 75 and less than or equal to 80;
the cross-section curve of the third curved surface (2043) is a cubic curve,
wherein: -45-40; -45-40; -15-20 and k-15; -2 is less than or equal to l is less than or equal to-1;
the cross-section curve of the fourth curved surface (2044) is a cubic curve,
wherein: -155-145 and m-145; n is more than or equal to 140 and less than or equal to 145; -50-40; p is more than or equal to 4 and less than or equal to 5;
the cross-section curve of the fifth curved surface (2045) is a cubic curve,
wherein: q is more than or equal to 20 and less than or equal to 25; -25-20; s is more than or equal to 8 and less than or equal to 10; -2 is less than or equal to t is less than or equal to-1;
wherein the boundary conditions are:
x 1 ＝x 2 ＝2.36 y 1 ＝y 2 ＝0.53
x 2 ＝x 3 ＝2.17 y 2 ＝y 3 ＝0.19
x 3 ＝x 4 ＝2.99 y 3 ＝y 4 ＝-0.45
x 4 ＝x 5 ＝3.58 y 4 ＝y 5 ＝0
the section curve of the sixth curved surface (2046) is an arc curve, the chord length of the butterfly valve (10) is L, and the radius of the arc curve of the sixth curved surface is 0.007L;
the cross-section curve of the seventh curved surface (2047) is a cubic curve, and the overflow area of the jet outlet between the seventh curved surface (2047) and the first curved surface (2041) linearly decreases by 1.2 times along the fluid flow direction.
2. An improved reduced separation vortex cavitation resistant valve according to claim 1 characterised in that the butterfly flap (10) is a single wing flap or a double wing flap arranged symmetrically on both sides of the valve shaft (5).
3. An improved reduced separation vortex cavitation valve in accordance with claim 1 wherein the active jet chamber (20) is disposed on one of the wing surfaces of the butterfly valve (10) or symmetrically on both wing surfaces of the butterfly valve (10).
4. An improved reduced separation vortex cavitation valve according to claim 1, characterised in that the rectifying section is a rectifying tube (203), the rectifying tube (203) being shaped to fit the jet inlet, inserted into the precompression chamber (u) along the jet inlet and fixed; the active jet cavity (20) is a curved cavity, and the cross section of the active jet cavity is in a hook shape; the total area of the holes of the rectifying holes is smaller than the area of the jet inlet.
5. An improved reduced separation vortex cavitation valve in accordance with claim 1 wherein the rectifying tip (202) extends from the butterfly valve (10) airfoil into the active jet cavity (20) in the direction of incoming flow within the valve body (1); the flow straightening tip (202) divides the active jet flow cavity (20) into a precompression cavity (u), a transitional compression cavity (v) and a jet flow compression cavity (w) which are sequentially arranged along the fluid flow direction, a gap between the end part of the flow straightening tip (202) and the active jet flow cavity (20) is the transitional compression cavity (v), and the precompression cavity (u) is communicated with the jet flow inlet.
6. An improved separation vortex cavitation-resistant valve according to claim 5, characterised in that a flow passage dividing plate (201) is provided in the jet flow compression chamber (w) to divide the jet flow compression chamber (w) into at least two flow passages in a direction parallel to the valve axis (5).
7. The improved separation vortex cavitation-resistant valve according to claim 1, wherein the valve shaft (5) is convexly provided with a guide protrusion, a limit groove matched with the guide protrusion is formed in the valve body (1) to limit the maximum rotation amplitude of the valve shaft (5) to ninety degrees, and when the valve shaft (5) is positioned at an initial rotation point, the butterfly valve (10) just completely blocks the overflow cavity (4); one end of the valve shaft (5) extends out of the valve body (1) and is connected with the adjusting hand wheel (3) so as to control the rotation of the adjusting hand wheel.
8. An improved separation vortex cavitation-resistant valve according to claim 1, characterized in that the active jet source is an active jet channel (6) arranged in the valve shaft (5), one end of the active jet channel (6) extends into the butterfly valve (10) and is communicated with the jet inlet, and the other end extends out of the valve body (1) and is communicated with the drainage tube (2) to introduce the fluid source.
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| CN202110471911.2A CN113251152B (en) | 2021-04-29 | 2021-04-29 | Improved generation reduces separation vortex anti-cavitation valve |
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| CN202110471911.2A CN113251152B (en) | 2021-04-29 | 2021-04-29 | Improved generation reduces separation vortex anti-cavitation valve |
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