CN104197050A - Low flow resistance axial-flow type check valve with closing tail section with slow closing protection function - Google Patents
Low flow resistance axial-flow type check valve with closing tail section with slow closing protection function Download PDFInfo
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- CN104197050A CN104197050A CN201410443301.1A CN201410443301A CN104197050A CN 104197050 A CN104197050 A CN 104197050A CN 201410443301 A CN201410443301 A CN 201410443301A CN 104197050 A CN104197050 A CN 104197050A
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- 230000009977 dual effect Effects 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 208000007623 Lordosis Diseases 0.000 claims description 3
- 241000276425 Xiphophorus maculatus Species 0.000 claims description 3
- 238000003801 milling Methods 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000006378 damage Effects 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 13
- 239000007789 gas Substances 0.000 description 13
- 238000007789 sealing Methods 0.000 description 13
- 239000007788 liquid Substances 0.000 description 12
- 230000003068 static effect Effects 0.000 description 11
- 239000012530 fluid Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 9
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- 238000013461 design Methods 0.000 description 8
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008520 organization Effects 0.000 description 2
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- JRZJOMJEPLMPRA-UHFFFAOYSA-N olefin Natural products CCCCCCCC=C JRZJOMJEPLMPRA-UHFFFAOYSA-N 0.000 description 1
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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
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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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
- F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Check Valves (AREA)
Abstract
The invention discloses a low flow resistance axial-flow type check valve with the closing tail section with a slow closing protection function. The low flow resistance axial-flow type check valve is characterized in that tail cone flow guide set holes are formed in a tail cone to be communicated with a tail cone cavity, a tail cone throttling opening is formed in the front end of the tail cone, a damping flap is installed at the tail end of a valve rod, the outer diameter of the damping flap is identical with the aperture of the tail cone throttling opening, and a throttling conical surface is arranged on the periphery of the front side of the damping flap; the crown part of a valve clack is provided with a cylindrical valve clack cylinder in a backward mode, and the outer circle of the valve clack cylinder is matched with a guide hole of an inner container of a valve body; a flow passing hole is formed between the tail cone cavity and the internal cavity of the valve clack and the inner container of the valve body; a front guide sleeve and a rear guide sleeve are arranged in the valve to support and guide the valve rod, and a valve flow channel is of a streamline structure. The low flow resistance axial-flow type check valve with the closing tail section with the slow closing protection function has the advantages that effective slow closing protection can be provided at the closing tail section of the valve, and a slow closing protection mechanism is reliable in work, simple in structure and low in production cost; exposed pipelines do not exist, damage is not likely to be generated, the hidden danger of external leakage does not exist, the working temperature of the valve is not limited, and the valve has lower pressure losses and the higher circulation capability.
Description
Technical field
The present invention relates to a kind of valve mechanism, be specifically related to a kind of structure of axial flow type check valve.
Background technique
In industries such as petrochemical industry, rock gas, chemical industry, electric power, urban water supply and sewerages, in order to prevent carrying in the system of fluid and pipeline because having a power failure or equipment failure causes fluid to flow backwards, make motor and pump reversing, and then the safe operation that affects pipeline and equipment even brings the badly damaged of pipe network and equipment, on delivery side of pump or pipeline, need to arrange safety check.For the especially bigbore safety check of all kinds of safety check, if Slow Close protection structure is not set in valve mechanism design, when cause medium to flow backwards due to reasons such as terminations of pumping, under the spring-force driven dual of the huge thrust of the medium of reverse flow and the set spring of some valve internal, flap with acceleration or with ever-increasing fluctuating acceleration to closing direction rapid movement and closing, except meeting brings the damage of intense impact and the vibration producing therefrom and strong noise and even sealing surface to sealing surface and valve, more seriously, because the flow velocity of fluid in pipeline is down to rapidly zero from maximum refluence speed, the kinetic transformation of fluid is static energy, can make the static pressure in pipeline raise rapidly, generation may have to pipe-line system the water hammer of destruction, serious destructive water hammer even can make pipeline and valve body produce explosion, consequence is comparatively serious.Therefore the safety check that, bore is larger should arrange Slow Close protection structure; The better set-up mode of Slow Close protection structure is that the latter end of only closing at flap arranges damping to the closing motion of flap; in the time that medium flows backwards; flap the leading portion of closing still can quick closedown effectively to protect the safety of pump and system; and slow down, realize Slow Close closing latter end, to alleviate or to eliminate and impact and water hammer.
Existing safety check product adopts following three kinds of Slow Closes protection structures conventionally: 1, rocking arm is set and heavy hammer structure produces the moment contrary with flap closing direction to postpone the shut-in time (seeing Fig. 1 and Fig. 2) of flap in the roller end that passes valve body.The shortcoming of this structure is: the effect of (1), Slow Close protection is poor, the effect of weight is more that while being embodied in valve opening, auxiliary flap maintains fully open position, eliminates vibration and the drift of flap, to alleviate and to eliminate the wearing and tearing of rotating shaft and the impact noise of flap and valve body; (2), the opposing torque of weight is attached to the whole process that flap is closed, and is unfavorable for the safety protection to pump and system; (3), the rotating shaft position that passes valve body generally can arrange filler compacting structure, larger filler frictional force can hinder the motion of rotating shaft and flap, affects the operational safety of valve.2, adopt oil hydraulic cylinder oil pressure Slow Close, the set-up mode of oil cylinder is according to the difference of valve and Slow Close structural design, and some product damping functions are only arranged on flap and close latter end, and what have is arranged on the whole process that flap is closed.The shortcoming of this class slow-closing structure is: (1), structure are more complicated, and manufacture cost is high; (2), in the time that refluence pressure is large or occur turbulent flow, cylinder piston motion is accelerated, and causes cushioning effect not obvious; (3), oil pipeline exposes, easily break, and refuel also inconvenient; (4), the Sealing that uses in oil cylinder is rubber parts, therefore the operating temperature of valve is restricted, and can only be used for normal temperature operating mode; (5), when oil cylinder is that when flap whole process is arranged to damping, the closing velocity of flap is slower, has affected the performance of the protective action of valve to pump and system; (6), when oil cylinder is for closing latter end when damping is set to flap, when valve closing, the piston rod end of flap fast approaching oil cylinder can produce stronger impact and impact sound; And piston rod end and flap surface of contact likely can hinder the slippage of the surface of contact that the process of fastening certainly exists after damaging because of strong collision, and this will cause piston rod jam and make flap be difficult to arrive complete shut-down position.3, built-in Slow Close piston cylinder the working medium using the operating mode medium in valve as piston cylinder are set, as shown in Figure 3, Figure 4, its shortcoming is: (1), in the time containing impurity in medium, impurity may make piston produce jam or cause piston or pulling appears in cylinder surface, thereby can affect the reliability of damping mechanism work; (2), easily occur that impurity stops up the phenomenon of bypass tube, after bypass tube is blocked, damping mechanism cannot play a role; (3), be the liquid easily freezing as what carry in pipeline, while being water as working medium, once the medium in bypass tube because of low temperature and not flow freeze, also can cause damping mechanism ineffective.
Above-mentioned Slow Close protection structure is mainly used in the butterfly type safety check of Swing check valve, two bias or three bias.The safety check using for some specific operation, as the supporting safety check of petrochemical plant olefin hydrocarbon apparatus pipeline, because the working pressure of medium is lower, requires to select the safety check of low pressure drop; Some remote field long-distance transport pipes is as the safety check of being installed on natural gas line, also requires to reduce possible leak source and the outside demountable structure not leading to body cavity of leaking except requiring low pressure loss as far as possible.These specific product type selections require all can impel user to select the safety check-axial flow type check valve of another kind of type, are the comparatively typical structure of one of existing axial flow type check valve product as shown in Figure 5.Axial flow type check valve is because valve body is overall full-closed structure, can block the external leakage of medium completely, and carried out under the prerequisite of reasonable and sufficient optimal design at the runner of valve, axial flow type check valve can obtain relatively lower flow resistance coefficient and crushing, can obtain the negotiability larger than the safety check of other type.For the larger axial flow type check valve of axial flow type check valve especially bore, impact and water hammer when equally also needing to arrange Slow Close protection structure and alleviating or eliminate flap and close; The safety check, the valve rod that are different from other type due to the structural feature of axial flow type check valve are positioned at sealing or the hemi-closure space in the middle of valve; this setting to Slow Close protection structure has brought difficulty, therefore existing axial flow type check valve temporary transient also lack there is the product that is provided with Slow Close protection structure of use value can be for relevant applying working condition for type selecting and supporting.
Summary of the invention
In order to overcome the existing above-mentioned some shortcomings part of existing product, the invention provides a kind of structure of the low flow resistance axial flow type check valve of closing latter end band Slow Close protective function at valve, thereby this structure can provide effective Slow Close protection valve is effectively alleviated in the safety of pump and system that can adequately protect or eliminate and impact and water hammer at the latter end of closing of valve, Slow Close protection arrangement works is reliable, structure and manufacture are simple, cost of production is low, be difficult for producing and damage, do not have external leakage hidden danger, operating temperature is unrestricted; In addition valve has lower crushing and larger negotiability.
To achieve these goals, the present invention is by the following technical solutions:
A kind of low flow resistance axial flow type check valve of closing latter end band Slow Close protective function, its major part comprises valve body, flap, valve body inlet side inwall and and valve body between carried out the valve seat that is tightly connected, the valve rod connecting as one by screw thread and weld seam and flap, be installed on the damping lobe of valve rod tail end, be threaded connection and be installed on the valve body inner bag tail end of valve body and the basic shape of outer surface and be tip towards the tail cone body of the taper of valve outlet direction and be fixedly installed in spring seat and the spring of the valve body inner bag lumen of valve body, the technological scheme that it is basic and major technique key are: the inside of tail cone body is cavity--tail cone chamber, on tail cone body, be provided with the tail cone water conservancy diversion group hole being formed from the inside through hole of its conical outer surface by multiple, on tail cone body, be provided with circular tail cone restriction towards the front end of valve inlet direction, in the time of valve wide open, the damping lobe that is installed on the revolution bodily form of valve rod tail end is positioned at tail cone chamber, the crown flap main body of flap front portion--flap bizet is provided with columnar flap cylindrical shell backward, the cylindrical of flap cylindrical shell and valve body inner bag front end endoporus--inner bag pilot hole coordinates, also be provided with internal cavities between multiple connection flap bizets, flap cylindrical shell and valve body inner bag and the through hole-through flow hole between tail cone body at the step plane place of spring seat rear end.
In order to improve and the performance of improving product, the present invention has added following several further technological scheme:
Being shaped as of the outer surface of the flap bizet of flap front portion: middle part be to lordosis to valve body inlet side, surface is the circular arc turning surface that inwardly concaves, recessed circular arc turning surface is the circular arc turning surface that bulges laterally, and two sections of circular arc turning surface are tangent and form the streamline channel surface being smoothly connected.
The aperture of the outside diameter of damping lobe and tail cone restriction is suitable.
The front side periphery of damping lobe is provided with the conical surface.
Between the housing of valve body and valve body inner bag, be connected with uniform several gussets that are connected, connect the streamlined platy structure that two ends zoom in forward with arc surface that is shaped as of gusset.
Guide sleeve and rear guide sleeve before the endoporus place at spring seat two ends arranges respectively, the polished rod surface of valve rod is rear for being slidably matched with the endoporus assembling of front guide sleeve, rear guide sleeve; The surface-mounted front of front guide sleeve and rear guide sleeve and valve rod all carries out surface peening through thermo-chemical treatment.
The manufacturability of manufacturing in order to improve product, the present invention has added following two further technological schemes:
The step hole that the section of opening is inwardly milled into from the conical surface for milling cutter is worked in the aperture, outside in tail cone water conservancy diversion group hole, and through hole inwardly bored to tail cone chamber from step hole plane.
The flap shell portion of flap for to be welded mutually with flap bizet with cylindrical component after roughing, and both weld, and rear one-tenth is as a whole forms flap through fine finishing.
In order to improve the operational safety of product, the present invention has also added following two further technological schemes:
Front guide sleeve and rear guide sleeve pack into behind the installation step hole at spring seat two ends, and load hole circlip in the annular groove of processing in the aperture of the mounting hole of every end, packs two circlip for holes in each annular groove.
In valve, be provided with inside and outside concentric arrangement, dual spring that rotation direction is contrary.
The invention has the beneficial effects as follows: can provide effective Slow Close protection at the latter end of closing of valve, thereby valve is effectively alleviated in the safety of pump and system that can adequately protect or eliminate and impact and water hammer, avoid producing water hammer and destroy; Slow Close protection mechanism simple in structure, only on the conventional structure with Slow Close protection, do not increasing a damping lobe, thereby product manufacture is simple, cost of production is low, and with Slow Close protection structure with the conversion in the time assembling of the product of the conventional structure with Slow Close protection is also comparatively simple, facilitate organization of production; Without exposing oil pipeline and medium bypass tube, being difficult for producing and damaging, without oiling, and there is not obstruction and the frozen problem of bypass tube yet; Without external structure, thereby there is not external leakage hidden danger and do not exist filler surface friction drag to hinder the problem of flap motion; Do not have the impact of flap and Slow Close mechanism and the jam of collision and part or pull, Slow Close protection arrangement works is reliable; Because Slow Close protection structure is embedding structure, metal seal nothing but, thereby the operating temperature of valve can not be restricted; Specific aim, the better Slow Close protection mechanism of suitability be selected and be built with to valve can easily according to the different conditions of medium.In addition,, compared with the safety check of other type, the valve of this structure has lower crushing and larger negotiability.
Brief description of the drawings
Fig. 1 is that existing safety check product arranges the product schematic diagram that rocking arm and heavy hammer structure postpone the shut-in time of flap.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the product schematic diagram that existing safety check product arranges the Slow Close piston cylinder structure using operating mode medium as piston cylinder working medium.
Fig. 4 is the left view of Fig. 3.
Fig. 5 is the structural representation of the axial flow type check valve product of prior art.
Fig. 6 is the schematic diagram of embodiment of the present invention.
Fig. 7 is the embodiment of the present invention one--damping valve structure schematic diagram when medium is liquid.
Fig. 8 is the embodiment of the present invention two--damping valve structure schematic diagram when medium is gas.
Fig. 9 is the left view of Fig. 7, Fig. 8.
Figure 10 is the embodiment of the present invention one--when medium is liquid, valve starts to enter the schematic diagram in Slow Close stage.
Figure 11 is the embodiment of the present invention one--when medium is liquid, flap enters the schematic diagram in last decelerating phase.
Figure 12 is the embodiment of the present invention one--schematic diagram when valve enters closed condition when medium is liquid.
Figure 13 is the embodiment of the present invention two--when medium is gas, valve starts to enter the schematic diagram in Slow Close stage
Figure 14 is the embodiment of the present invention two--when medium is gas, flap enters the schematic diagram in last decelerating phase.
Figure 15 is the embodiment of the present invention two--schematic diagram when valve enters closed condition when medium is gas.
Figure 16 is that product of the present invention is cancelled damping lobe, schematic diagram during as the conventional products assembling with Slow Close protection.
In figure, 1, valve body; 1-1, connection gusset; 1-2, valve body inner bag; 1-3, inner bag pilot hole; 1-4, inner bag front-end face; 2, valve seat; 2-1, sealing surface of seat; 3, flap; 3-1, flap bizet; 3-2, valve clack sealing surface; 3-3, flap cylindrical shell; 4, valve rod; 5, tail cone body; 5-1, tail cone restriction; 5-2, tail cone chamber; 5-3, tail cone water conservancy diversion group hole; 6, damping lobe; 6-1, damping lobe inner cone; 6-2, damping lobe cylindrical; 7, nut; 8, spring pad; 9, cotter pin; 10, front guide sleeve; 11, spring; 12, spring seat; 13, through flow hole; 14, spring overcoat; 15, bolt; 16, rear guide sleeve; 17, circlip for hole.
Embodiment
Below in conjunction with accompanying drawing and two embodiments, technological scheme of the present invention is further elaborated.
Embodiment one
Axial flow type check valve described in the present embodiment is mainly used in the pipeline of liquid medium, as prevent medium flow backwards time automatic blocking-up valve.
Be the basic structure schematic diagram of the low flow resistance axial flow type check valve technological scheme of closing latter end band Slow Close protective function proposed by the invention as shown in Figure 6, its major part comprises: valve body (1), valve seat (2), flap (3), valve rod (4), tail cone body (5), damping lobe (6), spring (11), spring seat (12) and front guide sleeve (10) and rear guide sleeve (16).Valve seat (2) can be in different ways according to the difference of valve aperture size in the means of fixation of valve body (1) inlet side inwall: in small-bore valve, valve seat (2) can screw and be fixed on valve body (1) with screw thread, seal with O type circle, the mode being threaded that should not adopt that is connected of large bore valves valve seat and valve body, fix valve seat and need to and certain mechanical connecting structure be set with the pattern of valve component, in the present embodiment, adopt three open loops to pack in valve body annular groove to fix valve seat (2), also ensure sealing with O type circle, the surface of valve seat or valve component is that the conical surface of arc surface and both sides is smoothly connected, the conical surface of both sides is substantially identical with the bearing of trend of valve body adjacently situated surfaces after extending to both sides, makes valve seat or valve component link up mutually and form smooth streamline channel surface with valve body surface, in valve body, the surface at other runner position also adopts smooth fairing ace.After being threaded connection between valve rod (4) and flap (3) and screwing, with argon-arc welding seam, both are connected as one.Tail cone body (5) is threaded connection the tail end of the valve body inner bag (1-2) that is installed on valve body (1), and the basic shape of tail cone body (5) outer surface is the taper of tip towards valve body (1) Way out.
Spring seat (12) is fixedly installed in valve body inner bag (1-2) middle part of valve body (1) by bolt (15), as supporting and the guiding element of spring (11), simultaneously also as supporting and the guiding element of flap (3) and valve rod (4) assemblying body.Because the weight of flap (3) and valve rod (4) assemblying body is heavier, make easily to produce and pull between valve rod (4) and the guide surface of spring seat (12), especially the axial flow type check valve that bore is larger is all the more so, therefore be provided with respectively front guide sleeve (10) and rear guide sleeve (16) at the endoporus place at spring seat (12) two ends, polished rod surface and the front guide sleeve (10) of valve rod (4), the endoporus assembling of rear guide sleeve (16) is rear for being slidably matched, simultaneously, the surface-mounted front of front guide sleeve (10) and rear guide sleeve (16) and valve rod (4) all carries out in surface peening-the present embodiment through thermo-chemical treatment, front guide sleeve (10), ionic nitrizing treatment is all carried out on the surface of rear guide sleeve (16) and valve rod (4), can significantly improve the surperficial tension that is slidably matched and hinder ability.Front guide sleeve (10) and rear guide sleeve (16) pack into behind the installation step hole at spring seat (12) two ends, in the annular groove of processing in the aperture of the mounting hole of every end, circlip (17) for load hole, packs two circlip for holes (17) in each annular groove; Adopt circlip to prevent that guide sleeve from deviating from, disassemble or assemble are quick, assembling and the maintenance of product are facilitated, in the annular groove in simultaneously each guide sleeve outside, pack two circlips into, can improve reliability, effectively avoid guide sleeve under the drive of mobile valve rod (4), to be taken away the installation step hole at spring seat (12) two ends.
For the consideration of spring rate characteristic and the needs of raising reliability, the spring (11) of the present embodiment adopts two springs contrary with rotation direction that differ in size to be installed in parallel, the inside and outside concentric arrangement of two springs.First the setting that adopts dual spring is to consider: the spring force of a spring is split as and allows two springs jointly share, the cross section of each spring is little more many than the cross section of an original spring, thereby thereby in identical length, spring can be arranged to the more number of turns and make the stiffness characteristics of spring can meet better the needs of valve working; In addition it is also apparent adopting dual spring to be conducive to improve reliability: because spring material is through hardening processing, in the time of the unexpected impact of bearing valve opening and closing, be difficult to definitely avoid occurring the unexpected situation of spring breakage, therefore arrange dual spring help ensure valve use more reliably.Two contrary benefits of spring rotation direction are: spring, in the time of compression and stretching, extension, certain torsion can occur, thereby in the process of opening fast or closing, likely can be driven and rotate by the end face of spring when flap (3), this can increase valve rod, guide sleeve surface and flap and sealing surface of seat wearing and tearing and abrasive possibility occur.In valve, be provided with after dual spring, need to be used as at the arranged outside spring overcoat (14) of outside spring supporting and the guiding element of outside spring, and nationality helps bolt (15) to compress and fixing spring overcoat (14) and spring seat (12) simultaneously.The setting of dual spring is mainly used in bigbore axial flow type check valve, and smaller diameter valve is because the restriction in space in valve still adopts single spring structure, and now spring outside does not just need to arrange spring overcoat (14).
As shown in Figure 7, the inside of tail cone body (5) is cavity--tail cone chamber (5-2), on tail cone body (5), be provided with the tail cone water conservancy diversion group hole (5-3) (referring to Fig. 9) being formed from the inside through hole of conical outer surface of tail cone body (5) by multiple, for the ease of processing, each aperture, outside in tail cone water conservancy diversion group hole (5-3) is worked the section of opening milling cutter and is inwardly milled into formation step hole from the conical surface, and through hole inwardly bored to tail cone chamber (5-2) from step hole plane; The upper front end towards valve inlet direction of tail cone body (5), and be provided with circular tail cone restriction (5-1); At the tail end of valve rod (4), the damping lobe (6) of the revolution bodily form is installed, damping lobe (6) is fixed with nut (7) and spring pad (8), and nut (7) is locking by cotter pin (9); In the time of valve wide open, the damping lobe (6) that is installed on valve rod (4) tail end is positioned at tail cone chamber (5-2); The aperture of the diameter of damping lobe cylindrical (6-2) and tail cone restriction (5-1) is suitable, and the front side periphery of damping lobe (6) is with the conical surface--damping lobe inner cone (6-1).In the present embodiment, damping lobe inner cone (6-1) is the narrower conical surface.
Valve flap structure aspect, from flap (3) anterior crown main body--flap bizet (3-1) backward, is provided with columnar flap cylindrical shell (3-3) (seeing Fig. 6), in the present embodiment, flap cylindrical shell (3-3) part is for to be welded mutually after roughing with cylindrical component and flap bizet (3-1), both weld, and rear one-tenth is as a whole forms flap (3) through fine finishing, the external diameter of flap cylindrical shell (3-3) is less than the maximum outside diameter of flap bizet (3-1), the spacing plane be provided with a plane as flap (3) standard-sized sheet between the maximum outside diameter place of flap bizet (3-1) and flap cylindrical shell (3-3) cylindrical time, the cylindrical of flap cylindrical shell (3-3) part and valve body inner bag (1-2) front end endoporus--inner bag pilot hole (1-3) coordinates, in the time that flap (3) arrives fully open position, spacing plane between aforesaid flap bizet (3-1) and flap cylindrical shell (3-3) cylindrical and valve body inner bag (1-2) front Transverse plane--inner bag front-end face (1-4) contacts, the fully open position of flap (3) is determined, flap bizet (3-1) outer surface is coherent mutually with valve body inner bag (1-2) outer surface simultaneously, be connected to form smooth water-drop-shaped and fairshaped surface with tail cone body (5) three's outer surface.
Also be provided with the through hole-through flow hole (13) between internal cavities and the tail cone body (5) between multiple connection flap bizets (3-1), flap cylindrical shell (3-3) and valve body inner bag (1-2) at the step plane place of spring seat (12) rear end.Be provided with after spring overcoat (14) when having adopted the structure of dual spring, need to process in the corresponding position of the step plane of spring overcoat (14) through flow hole (13) consistent with spring seat (12).
In the time that medium flows backwards, the tail cone water conservancy diversion group hole (5-3) of medium from tail cone body (5) enters tail cone chamber (5-2), then enters into the internal cavities between flap bizet (3-1) and flap cylindrical shell (3-3) and valve body inner bag (1-2) by tail cone restriction (5-1) and through flow hole (13); Because the medium of the internal cavities that enters into flap (3) does not have flow velocity substantially, medium static pressure is gone up completely, and the medium in flap (3) outside is the medium flowing backwards at a high speed, the medium static pressure of a part has been converted into the kinetic energy of medium, thereby the medium static pressure in flap (3) outside will be lower than the inner medium static pressure of flap (3), the spring force that pressure difference is added spring (11) can promote flap (3) and move to valve seat (2) direction, and flap (3) is closed.
As shown in figure 10, flap (3) returns while closing, when damping lobe (6) moves forward to when approaching tail cone restriction (5-1) and locating, the medium that will enter into the internal cavities of flap (3) from tail cone chamber (5-2) starts damped lobe inner cone (6-1) and tail cone restriction (5-1) throttling, the rate-of flow flowing into reduces gradually, while reach under the poor and spring-force driven dual of inside and outside pressure medium due to flap (3), the volume of the internal cavities of flap (3) and valve body inner bag (1-2) is thereupon extended, when the medium that enters this internal cavities is because being reduced by throttling flow, while can not be in time supplementing on demand the extended volume of this internal cavities, because liquid medium can be considered to incompressible fluid, thereby the medium static pressure of the internal cavities of flap (3) and valve body inner bag (1-2) can decline quickly, the speed of advancement of flap (3) also can comparatively fast decline, in the present embodiment, damping lobe (6) starts stage of throttling and is set to remainder stroke and accounts for 20% left and right of total travel.Along with the continuation reach of flap (3), in the time that damping lobe cylindrical (6-2) starts to enter tail cone restriction (5-1) (seeing Figure 11), the passage that medium enters the internal cavities of flap (3) and valve body inner bag (1-2) is blocked completely--and stage that in the present embodiment, damping lobe cylindrical (6-2) enters tail cone restriction (5-1) is set to remainder stroke and accounts for 3～5% left and right of total travel, because medium is incompressible liquid medium, if now passage is blocked completely, do not have medium can enter this internal cavities completely, flap (3) can stop moving forward at once, because all there is matching gap between damping lobe cylindrical (6-2) and tail cone restriction (5-1) and between flap cylindrical shell (3-3) cylindrical and inner bag pilot hole (1-3), damping lobe cylindrical (6-2) enters and still has a certain amount of medium from this two gap location after tail cone restriction (5-1) and continue to enter, and flap (3) has dropped at the pressure that goes back to seat flap (3) outside (outflow side of refluence medium) when approaching closed position the back pressure that approaches barometric pressure or drop to the system of approaching, thereby when have a small amount of refluence medium to continue to enter the internal cavities of flap (3) and valve body inner bag (1-2) from above-mentioned two gap locations, flap (3) still can continue reach until close (Figure 12) with slower speed.Correctly arranging under the prerequisite of the matching gap between damping lobe cylindrical (6-2) and tail cone restriction (5-1) and between flap cylindrical shell (3-3) cylindrical and inner bag pilot hole (1-3), flap (3) can arrive sealing surface of seat (2-1) with required rational Slow Close speed in the final stage of closing and locate; Flap (3) can very effectively be eliminated water hammer and protection sealing surface and valve and avoids impact failure entering into the remarkable reduction of speed of closing the reduction of speed gradually of latter end 20% stroke and close latter end 3～5% strokes.
Above-mentioned flap closing process has embodied Slow Close protection structure proposed by the invention and has had change damping characteristic.Need to here be pointed out that, what the present invention had close total travel at flap can meet the change damping characteristic that different phase control speed requires, and is that the various Slow Closes protection structures that adopt of current all kinds of safety check product are not available.
Safety check product is full-gear while putting into operation, thereby the large young pathbreaker of the resistance coefficient of its runner has a direct impact the pressure loss of system, therefore, when safety check product specification, at the resistance coefficient that ensures should reduce by rational design in product performance runner as far as possible, this is that current all kinds of safety check product is general out in the cold or fail to cause a problem of enough attention in the time of design.Technological scheme of the present invention, in order to reduce the resistance coefficient of valve, has been carried out some new designs in the relevant surfaces of runner:
The shape of the outer surface of the flap bizet (3-1) of flap (3) front portion is designed to: middle part is (1) inlet side, the circular arc turning surface of surface for inwardly concaving to lordosis to valve body, recessed circular arc turning surface is outwardly circular arc turning surface laterally, and two sections of circular arc turning surface are tangent and form the streamline channel surface being smoothly connected.Valve clack sealing surface (3-2) is arranged on the outside that approaches of outwardly circular arc turning surface, slightly protrudes from the surface of this circular arc turning surface.
Between the housing of valve body (1) and valve body inner bag (1-2), be connected gusset (1-1) with uniform four and be connected, connect the streamlined platy structure (as shown in Figure 6) that two ends zoom in forward with arc surface that is shaped as of gusset (1-1).The connection gusset two ends of existing axial flow type check valve product are to adopt flush end or semi-circular ends, and MEDIA FLOW can produce vortex in the time of this place; The connection gusset two ends of the technical program be with arc surface zoom in forward, two end part approach pointed streamlined structure, MEDIA FLOW can not produce eddy current, can flow in order in the time of these two ends, is conducive to reduce the flow resistance of runner.
The airflow design that above-mentioned flap bizet (3-1) is surperficial with being connected gusset (1-1) and the surface of aforesaid valve seat or valve component, valve body adjacently situated surfaces adopt the surface at other runner position in mutually coherent fairing ace and valve body to adopt smooth fairing ace, form reasonable, the smooth streamline channel of valve, when media flow, do not have flow direction unexpected variation, there is no the flip-flop of cross section of fluid channel area, thereby make valve there is lower crushing and the flow coefficient of Geng Gao.
Embodiment two
Different from the medium that embodiment one structure is applicable, the axial flow type check valve described in the present embodiment is mainly used in the pipeline of gas medium, for preventing that medium from flowing backwards.
Because gas medium is completely different from the characteristic of liquid medium; liquid medium is incompressible fluid; and gas medium is compressible fluid; thereby the Slow Close protection structure that is applied to this two classes medium is also different; Slow Close protection structure for gas medium is compressible fluid thereby the variation of orifice size is had to hysteresis quality and low-response because of medium, need to design targetedly Slow Close protection structure for the characteristic of gas medium.
The technological scheme of the present embodiment is only from embodiment one difference the damping lobe (6) that has adopted structure different, all the other structures are identical, do not do below to apply for the technological scheme of these same structures and state, only the Slow Close mechanism part that relates to damping lobe (6) is illustrated.
As shown in Figure 8, the inside that is installed on the tail cone body (5) of valve body inner bag (1-2) rear end is set to cavity-tail cone chamber (5-2), on the conical surface of tail cone body (5), be provided with flow into tail cone chamber (5-2) for medium group hole-tail cone water conservancy diversion group hole (5-3) (Fig. 9), be provided with tail cone restriction (5-1) circular, that flow out and carry out throttling during at Slow Close from tail cone chamber (5-2) for medium at the front end of tail cone body (5); The damping lobe (6) of the revolution bodily form is installed at the tail end of valve rod (4), and damping lobe (6) compresses with nut (7) and is fixing, locking by cotter pin (9); When valve wide open, damping lobe (6) is positioned at tail cone chamber (5-2) position of cone end one side partially, the aperture of the diameter of damping lobe cylindrical (6-2) and tail cone restriction (5-1) is suitable, the length when axial length of damping lobe cylindrical (6-2) is longer than liquid medium in embodiment one; In the front side periphery of damping lobe (6) with the conical surface--damping lobe inner cone (6-1), the conical surface that in the present embodiment, damping lobe inner cone (6-1) is grown for axial length, during for Slow Close to gas medium throttling.When medium flows backwards, part medium enters tail cone chamber (5-2) from tail cone water conservancy diversion group hole (5-3) and then enters into the internal cavities between flap bizet (3-1) and flap cylindrical shell (3-3) and valve body inner bag (1-2) by tail cone restriction (5-1) and through flow hole (13), because the medium that enters into this internal cavities does not have flow velocity substantially, static pressure is gone up, and the medium in flap (3) outside is the medium flowing backwards at a high speed, thereby the medium static pressure in flap (3) outside will be lower than the inner medium static pressure of flap (3), the spring force that pressure difference adds upper spring (11) can promote flap (3) and move and flap (3) is closed to valve seat (2) direction.
As shown in figure 13, gas medium promotes flap (3) and goes back to pass while refluence, when the front end of the throttling conical surface-damping lobe inner cone (6-1) of damping lobe (6) front side moves forward to when approaching tail cone restriction (5-1) and locating, the medium flowing out from tail cone restriction (5-1) starts damped lobe inner cone (6-1) and tail cone restriction (5-1) throttling, rate-of flow reduces gradually, while moving forward due to flap (3), the volume of the internal cavities of flap (3) and valve body inner bag (1-2) is thereupon extended, when the medium that enters this internal cavities is because being reduced by throttling flow, the medium static pressure of the internal cavities of flap (3) and valve body inner bag (1-2) can decline gradually, the speed of advancement of flap (3) also can decline to some extent.In the present embodiment, damping lobe (6) starts stage of throttling and is set to remainder stroke and accounts for 35～40% left and right of total travel.Along with the continuation reach of flap (3), damping lobe cylindrical (6-2) starts to enter tail cone restriction (5-1) (seeing Figure 14), medium enters the passage of the internal cavities of flap (3) and valve body inner bag (1-2) and is blocked completely--and stage that in the present embodiment, damping lobe cylindrical (6-2) enters tail cone restriction (5-1) is set to remainder stroke and accounts for 10～15% left and right of total travel, due to flap (3) the pressure that goes back to seat flap (3) outside (outflow side of refluence medium) when approaching closed position dropped to approach minimum, thereby flap (3) still can continue reach with certain speed, the medium of internal cavities that is enclosed in flap (3) and valve body inner bag (1-2) is therefore and by dilatation gradually and make the pressure drop in cavity, flap (3) is slowed down until close (Figure 15).The setting of above-mentioned Slow Close protection can protect sealing surface and valve to avoid impact failure effectively.
Embodiment two protects structure for the Slow Close protection structure of gas medium and embodiment one the Slow Close for liquid medium, and only the structure of damping lobe (6) is different; and two kinds of damping lobes (6) are also identical with linkage structure and the size of valve rod (4), thereby also facilitate organization of production in can selecting and be built with according to the different conditions of medium specific aim, the better Slow Close protection of suitability structure.
The Slow Close protection structure that technological scheme of the present invention proposes has advantages of simple in structure, and this structure has only increased part-damping lobe than the conventional structure of not protecting with Slow Close in number of spare parts, thereby product manufacture is simple, cost of production is low.When the product of purchasing as user does not have Slow Close protection to require; with Slow Close protection structure with the conversion in the time assembling of the product of the conventional structure with Slow Close protection is also comparatively simple; as long as do not fill damping lobe, the tail cone restriction position of tail cone body front end removed to rear assembling by pattern requirement by turning in valve stem end simultaneously; just formed and met the product of not being with the conventional structure product design document of Slow Close protection to require, as shown in Figure 16.
Because Slow Close protection structure of the present invention is arranged in valve cavity, and the working medium of Slow Close protection mechanism is operating mode medium, thereby valve is without exposing oil pipeline and medium bypass tube, product is not easy to produce and damages in installing and using, without oiling, and there is not obstruction and the frozen problem of bypass tube yet yet; Due on valve without external structure, thereby there is not external leakage hidden danger and do not exist filler surface friction drag to hinder the problem of flap motion; Because Slow Close protection of the present invention is not structurally the piston rod that clashes into and promote slow-closing structure while approaching closed position by flap, therefore do not have the impact of flap and Slow Close mechanism and the jam of collision and part or pull, the work of Slow Close protection structure is more reliable; Because Slow Close protection structure is embedding structure; without nonmetallic Sealing; thereby the operating temperature of valve can not be restricted, only need to select corresponding part material according to other characteristic of operating temperature and medium, just can make valve work under required any operating temperature.
Below in conjunction with the accompanying drawings and embodiments technological scheme of the present invention has been made to specific description, but these accompanying drawings and explanation can not be understood to limit scope of the present invention.Those skilled in the art should know; the present invention is not subject to the restriction of above-described embodiment and accompanying drawing; its protection domain is defined by appending claims; any not exceeding the various changes in the scope that the claims in the present invention book defines, the technological scheme that modification forms; all do not depart from spirit of the present invention and technical spirit, within still can belonging to claim scope of the present invention.
Claims (10)
1. close the low flow resistance axial flow type check valve of latter end band Slow Close protective function for one kind, it comprises valve body (1), flap (3), the valve seat (2) that is positioned at valve body (1) inlet side inwall and is tightly connected with valve body (1), the valve rod (4) connecting as one by screw thread and weld seam and flap (3), be installed on the damping lobe (6) of valve rod (4) tail end, be threaded connection and be installed on valve body inner bag (1-2) tail end of valve body (1) and the basic shape of outer surface is the tail cone body (5) of tip towards the taper of valve body (1) Way out, be fixedly installed in spring seat (12) and the spring (11) of valve body inner bag (1-2) lumen of valve body (1), it is characterized in that: the inside of tail cone body (5) is cavity--tail cone chamber (5-2), on tail cone body (5), be provided with the tail cone water conservancy diversion group hole (5-3) being formed from the inside through hole of its conical outer surface by multiple, above be provided with circular tail cone restriction (5-1) towards the front end of valve inlet direction at tail cone body (5), in the time of valve wide open, the damping lobe (6) that is installed on the revolution bodily form of valve rod (4) tail end is positioned at tail cone chamber (5-2), flap (3) anterior crown flap main body--flap bizet (3-1) is provided with columnar flap cylindrical shell (3-3) backward, the cylindrical of flap cylindrical shell (3-3) and valve body inner bag (1-2) front end endoporus--inner bag pilot hole (1-3) coordinates, also be provided with the through hole-through flow hole (13) between internal cavities and the tail cone body (5) between multiple connection flap bizets (3-1), flap cylindrical shell (3-3) and valve body inner bag (1-2) at the step plane place of spring seat (12) rear end.
2. low flow resistance axial flow type check valve of closing latter end band Slow Close protective function according to claim 1; it is characterized in that: being shaped as of the outer surface of the anterior flap bizet (3-1) of described flap (3): middle part is (1) inlet side, the circular arc turning surface of surface for inwardly concaving to lordosis to valve body; recessed circular arc turning surface is the circular arc turning surface that bulges laterally, and two sections of circular arc turning surface are tangent and form the streamline channel surface being smoothly connected.
3. low flow resistance axial flow type check valve of closing latter end band Slow Close protective function according to claim 1, is characterized in that: the outside diameter of described damping lobe (6) is suitable with the aperture of tail cone restriction (5-1).
4. low flow resistance axial flow type check valve of closing latter end band Slow Close protective function according to claim 1, is characterized in that: the front side periphery of described damping lobe (6) is with the conical surface.
5. low flow resistance axial flow type check valve of closing latter end band Slow Close protective function according to claim 1; it is characterized in that: between the housing of valve body (1) and valve body inner bag (1-2), be connected with uniform several gussets (1-1) that are connected, connect the streamlined platy structure that two ends zoom in forward with arc surface that is shaped as of gusset (1-1).
6. low flow resistance axial flow type check valve of closing latter end band Slow Close protective function according to claim 1; it is characterized in that: the step hole that the section of opening is inwardly milled into from the conical surface for milling cutter is worked in the aperture, outside in described tail cone water conservancy diversion group hole (5-3), and through hole inwardly bored to tail cone chamber (5-2) from step hole plane.
7. low flow resistance axial flow type check valve of closing latter end band Slow Close protective function according to claim 1, it is characterized in that: be respectively arranged with front guide sleeve (10) and rear guide sleeve (16) at the endoporus place at described spring seat (12) two ends, the polished rod surface of valve rod (4) is rear for being slidably matched with the endoporus assembling of front guide sleeve (10), rear guide sleeve (16); Front guide sleeve (10) and rear guide sleeve (16) and the surface-mounted front of valve rod (4) all carry out surface peening through thermo-chemical treatment.
8. low flow resistance axial flow type check valve of closing latter end band Slow Close protective function according to claim 1; it is characterized in that: front guide sleeve (10) and rear guide sleeve (16) pack into behind the installation step hole at spring seat (12) two ends; in the annular groove of processing in the aperture of the mounting hole of every end, circlip (17) for load hole, packs two circlip for holes (17) in each annular groove.
9. low flow resistance axial flow type check valve of closing latter end band Slow Close protective function according to claim 1; it is characterized in that: flap cylindrical shell (3-3) part of described flap (3) is for to be welded mutually after roughing with cylindrical component and flap bizet (3-1), and both weld, and rear one-tenth is as a whole forms flap (3) through fine finishing.
10. low flow resistance axial flow type check valve of closing latter end band Slow Close protective function according to claim 1, is characterized in that: in valve, be provided with inside and outside concentric arrangement, dual spring that rotation direction is contrary.
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| CN201410443301.1A CN104197050B (en) | 2014-09-02 | 2014-09-02 | Close the low flow resistance axial flow type check valve of latter end band Slow Close defencive function |
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Cited By (6)
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| CN104990118A (en) * | 2015-08-03 | 2015-10-21 | 广东美的厨房电器制造有限公司 | Check valve and smoke exhauster |
| CN107339471A (en) * | 2017-02-09 | 2017-11-10 | 上海冠龙阀门自控有限公司 | A kind of barrier film buffer-type rubber flap check valve |
| CN108413122A (en) * | 2018-01-24 | 2018-08-17 | 江苏中兴水务有限公司 | A kind of water hammer abatement valve, water hammer abatement pipeline and pipeline water hammer-resistant method |
| CN109630404A (en) * | 2019-02-25 | 2019-04-16 | 金职液压动力(金华)有限公司 | A kind of embedded low flow resistance plunger pump cylinder body structure |
| CN110259996A (en) * | 2018-03-12 | 2019-09-20 | 中国航发商用航空发动机有限责任公司 | Aero-engine air pipe line closed type check-valves |
| DE102022125470A1 (en) | 2022-10-04 | 2024-04-18 | Otto Egelhof Gmbh & Co. Kg | Check valve, especially for a cooling or heating circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108413122A (en) * | 2018-01-24 | 2018-08-17 | 江苏中兴水务有限公司 | A kind of water hammer abatement valve, water hammer abatement pipeline and pipeline water hammer-resistant method |
| CN110259996A (en) * | 2018-03-12 | 2019-09-20 | 中国航发商用航空发动机有限责任公司 | Aero-engine air pipe line closed type check-valves |
| CN109630404A (en) * | 2019-02-25 | 2019-04-16 | 金职液压动力(金华)有限公司 | A kind of embedded low flow resistance plunger pump cylinder body structure |
| DE102022125470A1 (en) | 2022-10-04 | 2024-04-18 | Otto Egelhof Gmbh & Co. Kg | Check valve, especially for a cooling or heating circuit |
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Effective date of registration: 20190805 Address after: 300450 Yuzhuangzi Village, Tanggu Hujiayuan Street, Binhai New District, Tianjin Patentee after: Tianjin Kaifa Valve Co.,Ltd. Address before: Suzhou City, Jiangsu province 215026 Industrial Park of Suzhou Xinglong Street Tinglan home building 16 room 409 Patentee before: Zhang Hua |
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