CN104197050B - Close the low flow resistance axial flow type check valve of latter end band Slow Close defencive function - Google Patents
Close the low flow resistance axial flow type check valve of latter end band Slow Close defencive function Download PDFInfo
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- CN104197050B CN104197050B CN201410443301.1A CN201410443301A CN104197050B CN 104197050 B CN104197050 B CN 104197050B CN 201410443301 A CN201410443301 A CN 201410443301A CN 104197050 B CN104197050 B CN 104197050B
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- valve
- flap
- tail cone
- valve body
- slow close
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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
Abstract
The invention discloses a kind of low flow resistance axial flow type check valve closing latter end band Slow Close defencive function; its key problem in technology is: is provided with tail cone water conservancy diversion group hole on tail cone and is passed through tail cone chamber; the front end of tail cone is provided with tail cone restriction; damping lobe is installed on valve rod tail end, and its external diameter is suitable with tail cone restriction aperture, periphery, front side is provided with the throttling conical surface；Be provided with cylindrical shape backward at flap bizet, flap cylinder that cylindrical coordinates with valve body inner bag pilot hole；Tail cone chamber and flap, valve body inner bag internal cavities between be provided with through flow hole；Being provided with forward and backward fairlead in valve and valve rod carries out supporting guiding, valve flowing channel is streamlined structure.Provide the benefit that: can provide the protection of effective Slow Close at valve closing latter end, Slow Close protection mechanism reliable operation, simple in construction, production cost are low；Being not likely to produce damage without exposing pipeline, there is not external leakage hidden danger, valve working temperature is unrestricted, and valve has lower crushing and bigger negotiability.
Description
Technical field
The present invention relates to a kind of valve mechanism, be specifically related to the structure of a kind of axial flow type check valve.
Background technology
In industries such as petrochemical industry, natural gas, chemical industry, electric power, urban water supply and sewerages, in order to prevent in the system and pipeline of conveyance fluid because stopping
Electricity or equipment fault cause reverse flow of fluids, make motor and pump reversing, and then the safe operation affecting pipeline and equipment even brings the tight of pipe network and equipment
Heavily damage, delivery side of pump or pipeline need to arrange check-valves.For check-valves the most bigbore for all kinds of check-valves, if at valve
Structure design on be not provided with Slow Close protection structure, when causing medium to flow backwards due to reasons such as terminations of pumping, reverse flow medium huge thrust with
And under the spring-force driven dual of the spring set by some valve internal, flap is quickly transported with acceleration or with ever-increasing fluctuating acceleration to closing direction
Move and close, in addition to can bring the damage of intense impact and the vibration produced therefrom and strong noise or even sealing surface to sealing surface and valve, more
For seriously, owing in pipeline, the flow velocity of fluid is rapidly decreased to zero from maximum refluence speed, the kinetic energy of fluid is converted into static energy, can make pipeline
In static pressure raise rapidly, produce and pipe-line system may be had the water hammer of destruction, serious destructive water hammer even can make pipeline and valve
Body produces explosion, and consequence is the most serious.Therefore, the check-valves that bore is bigger should arrange Slow Close protection structure；The preferably side of setting of Slow Close protection structure
Formula is that the latter end only closed at flap arranges damping to the closing motion of flap, and when medium flows backwards, flap still can quick closedown at the leading portion closed
With effectively protection pump and the safety of system, and carry out slowing down, realizing Slow Close closing latter end, so that impact and water hammer are mitigated or eliminated.
Existing check-valves product generally uses following three kinds of Slow Closes protection structure: 1, arrange rocking arm and weight in the roller end passing valve body
Structure produces closes moment in opposite direction to postpone the shut-in time (see Fig. 1 and Fig. 2) of flap with flap.The shortcoming of this structure is: (1),
The effect of Slow Close protection is poor, assists flap to maintain fully open position, eliminate the vibration of flap when the effect of weight is more to be embodied in valve opening
And drift, to alleviate and to eliminate the abrasion of rotating shaft and flap and the impact noise of valve body；(2), the opposing torque of weight is attached to what flap was closed
Whole process, is unfavorable for the safeguard protection to pump and system；(3), rotating shaft passes the position of valve body and typically can arrange filler compacting structure, bigger filler
Frictional force can hinder the motion of rotating shaft and flap, affects the dependability of valve.2, hydraulic cylinder oil pressure Slow Close, the set-up mode root of oil cylinder are used
The difference designed according to valve and slow-closing structure, some product damping actions are positioned only at flap and close latter end, and have is then arranged on the whole process that flap is closed.
The shortcoming of this kind of slow-closing structure is: (1), structure are more complicated, and manufacturing cost is high；(2), when refluence pressure is big or turbulent flow occurs, oil cylinder piston is transported
Dynamic quickening, causes buffering effect inconspicuous；(3), oil pipeline expose, easily break, and refuel also inconvenient；(4), used in oil cylinder
Sealing member is rubber parts, and therefore the operating temperature of valve is restricted, and is only used for room temperature operating mode；(5), when oil cylinder is for arrange resistance to flap whole process
During Buddhist nun, the closing velocity of flap is relatively slow, have impact on valve to pump and the performance of the protective effect of system；(6), when oil cylinder be to flap close latter end
When arranging damping, during valve closing, the piston rod end of flap fast approaching oil cylinder can produce stronger impact and impact sound；And piston rod end
Likely can hinder the sliding of the contact surface that the process of fastening certainly exists with valve flap contacts face after damaging because of strong collision, this will cause piston rod jam
And make flap be difficult to arrive closed positions.3, built-in Slow Close piston cylinder is set and using the operating mode medium in valve as the working media of piston cylinder, as
Shown in Fig. 3, Fig. 4, its shortcoming is: (1), when in medium containing impurity, and impurity may make piston produce jam or cause piston or cylinder body
Pulling occurs in surface, thus can affect the reliability of buffer gear work；(2) phenomenon of impurity blocking bypass pipe, easily occur, bypass pipe is blocked
After plug, buffer gear will be unable to play a role；(3), as in pipeline conveying be the liquid easily freezed, when being water such as working media, once other
Medium in siphunculus is because of low temperature and does not flows and freezes, and also results in buffer gear ineffective.
Above-mentioned Slow Close protection structure is mainly used in the butterfly-type check-valves of swing check valve, double bias or three eccentricity.For some specific work
The check-valves that condition is used, check-valves as supporting in petrochemical plant olefin hydrocarbon apparatus pipeline, owing to the operating pressure of medium is relatively low, it is desirable to selects low-pressure
The check-valves of fall；Some the remote field long-distance transport pipes such as check-valves installed on natural gas line, also requires as far as possible in addition to requiring low pressure loss
Reduce possible leak leak source and the outside demountable structure not led to body cavity.These specific product type selections require all to promote user to select
Another type of check-valves-axial flow type check valve, is the more typical structure of one of existing axial flow type check valve product as shown in Figure 5.Axle
Flow type back valve is overall full-closed structure due to valve body, it is possible to block the external leakage of medium completely, and carried out rationally at the runner of valve and
On the premise of sufficiently optimizing design, axial flow type check valve can obtain relative the lowest flow resistance coefficient and crushing, be obtained in that and stop than other type of
Return the negotiability that valve is bigger.For the axial flow type check valve that axial flow type check valve especially bore is bigger, it is also required to equally arrange Slow Close protection
Structure is mitigated or eliminated impact when flap is closed and water hammer；Owing to the construction features of axial flow type check valve is different from other type of non-return
Valve, valve rod are positioned at the closing in the middle of valve or hemi-closure space, and this brings difficulty to the setting of Slow Close protection structure, the most existing axial-flow type
Check-valves temporarily also lack there is the product being provided with Slow Close protection structure of practical value can be for relevant applying working condition for type selecting and supporting.
Summary of the invention
In place of overcoming the above-mentioned some shortcomings existing for existing product, the invention provides a kind of closedown latter end band Slow Close at valve and protect
The structure of the low flow resistance axial flow type check valve of protective function, this structure can provide effective Slow Close to protect so that valve is at energy at the closedown latter end of valve
Impact and water hammer are effectively mitigated or eliminated while the safety of pump and system that enough adequately protects, and Slow Close protection arrangement works is reliable, structure and manufacture
Simply, production cost low, be not likely to produce damage, there is not external leakage hidden danger, operating temperature is unrestricted；In addition valve have lower crushing and
Bigger 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 closing latter end band Slow Close defencive function, its major part includes valve body, flap, is positioned at valve body and enters
Mouthful side inwall and and valve body between be tightly connected valve seat, the valve rod connected as one with flap by screw thread and weld seam, be installed on valve rod tail
The damping lobe held, the basic configuration being threaded connection the valve body inner bag tail end and outer surface that are installed on valve body are the tip cone towards valve outlet direction
The tail cone of shape and be fixedly installed in the spring base of valve body inner bag lumen of valve body and spring, its basic technical scheme and major technique key are:
The inside of tail cone is cavity--tail cone chamber, tail cone is provided with the tail cone water conservancy diversion group being made up of multiple through holes inside from its conical outer surface
Hole, on tail cone, the front end towards valve inlet direction is provided with circular tail cone restriction, when valve wide open, is installed on returning of valve rod tail end
The damping lobe of shape of turning is positioned at tail cone chamber；Flap anterior crown flap main part--flap bizet is provided with columnar flap backward
Cylinder, the cylindrical of flap cylinder and valve body inner bag front end endoporus--inner bag pilot hole coordinates；It is additionally provided with multiple at the step plane of spring base rear end
Through hole-through flow hole between connection flap bizet, internal cavities and tail cone between flap cylinder and valve body inner bag.
In order to improve the performance with improving product, the present invention addition of following several further technical scheme:
Being shaped as of the outer surface of the flap bizet that flap is anterior: middle part be convex to forward valve body inlet side, surface is the circular arc inwardly concaved
The shape surface of revolution, the recessed circular arc surface of revolution is the most then for the circular arc surface of revolution that bulges, and two sections of circular arc surfaces of revolution are tangent and formed smooth
The streamline channel surface connected.
The outside diameter of damping lobe is suitable with the aperture of tail cone restriction.
The periphery, front side of damping lobe is provided with the conical surface.
Being connected with uniform several gussets that are connected between the housing of valve body with valve body inner bag, connect gusset is shaped as two ends with arc surface forward
The streamlined platy structure zoomed in.
Fairlead and rear fairlead before being respectively provided with at the endoporus at spring base two ends, the polished rod surface of valve rod and front fairlead, rear fairlead
For being slidably matched after endoporus assembling；Front fairlead and rear fairlead and valve rod surface-mounted before all carry out surface peening through thermo-chemical treatment.
In order to improve the manufacturability of product manufacturing, the present invention addition of following two further technical schemes:
It is the stepped hole that milling cutter is inwardly milled at the conical surface that the section of opening is acted in the aperture, outside in tail cone water conservancy diversion group hole, and through hole inwardly bores at stepped hole plane
Cross to tail cone chamber.
The flap shell portion of flap for be welded mutually after roughing with flap bizet with cylindrical component, both welding after become one whole
Body forms flap through polish.
In order to improve the dependability of product, the present invention also addition of following two further technical schemes:
After front fairlead and rear fairlead load the installation step hole at spring base two ends, the annular groove processed in the aperture of the installing hole often held is built-in
Enter circlip for hole, in each annular groove, load two circlip for holes.
Inside and outside concentric arrangement, oppositely oriented dual spring it is provided with in valve.
The invention has the beneficial effects as follows: the protection of effective Slow Close can be provided at the closedown latter end of valve, so that valve can adequately protect
Impact and water hammer are effectively mitigated or eliminated, it is to avoid produce water flow impulsion while the safety of pump and system；The simple in construction of Slow Close protection mechanism,
On the conventional structure protected without Slow Close, only add a damping lobe, thus product manufacturing is simple, production cost is low, and band Slow Close protection structure
The most relatively simple with the conversion when assembling of the product of the conventional structure protected without Slow Close, facilitate organization of production；Without exposing oil pipeline and medium
Bypass pipe, it is not likely to produce damage, without oiling, and there is not blocking and the frozen problem of bypass pipe；Without external structure, thus outside not existing
Leakage hidden danger and the problem that there is not the obstruction flap motion of filler frictional resistance；There is not flap and the impact of Slow Close mechanism and collision and the card of part
Hindering or pull, Slow Close protection arrangement works is reliable；Because Slow Close protection structure is embedding structure, without non-metallic seal, thus the operating temperature of valve
Can not be limited；Valve can select according to the different conditions of medium and be built with specific aim, suitability more preferable Slow Close protection mechanism easily.
Additionally, compared with other type of check-valves, the valve of this structure has lower crushing and bigger negotiability.
Accompanying drawing explanation
Fig. 1 is that existing check-valves product arranges rocking arm and heavy hammer structure to postpone the product schematic diagram of the shut-in time of flap.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the product schematic diagram that existing check-valves product arranges the Slow Close piston cylinder structure using operating mode medium as piston cylinder working media.
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--medium is damping valve structure schematic diagram during liquid.
Fig. 8 is the embodiment of the present invention two--medium is damping valve structure schematic diagram during 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 initially enters 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--when medium is liquid valve enter closed mode time schematic diagram.
Figure 13 is the embodiment of the present invention two--when medium is gas, valve initially enters 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--when medium is gas valve enter closed mode time schematic diagram.
Figure 16 is that the product of the present invention cancels damping lobe, as the schematic diagram during conventional products assembling protected without Slow Close.
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 cylinder；4、
Valve rod；5, tail cone；5-1, tail cone restriction；5-2, tail cone chamber；5-3, tail cone water conservancy diversion group hole；6, damping lobe；6-1, resistance
Buddhist nun's lobe inner cone；6-2, damping lobe cylindrical；7, nut；8, spring pad；9, split pin；10, front fairlead；11, spring；12、
Spring base；13, through flow hole；14, spring overcoat；15, bolt；16, rear fairlead；17, circlip for hole.
Detailed description of the invention
Technical scheme is further elaborated by below in conjunction with the accompanying drawings with two embodiments.
Embodiment one
Axial flow type check valve described in the present embodiment is mainly used in the pipeline of liquid medium, automatic blocked valve when flowing backwards as preventing medium
Door.
It is the basic knot of the proposed by the invention low flow resistance axial flow type check valve technical scheme closing latter end band Slow Close defencive function as shown in Figure 6
Structure schematic diagram, its major part includes: valve body (1), valve seat (2), flap (3), valve rod (4), tail cone (5), damping lobe (6), bullet
Spring (11), spring base (12) and front fairlead (10) and rear fairlead (16).Valve seat (2) fixing at valve body (1) entrance side inwall
Mode can be in different ways according to the difference of valve aperture size: in small-bore valve, valve seat (2) can be installed fixing with threaded engagement
On valve body (1), sealing with O, large bore valves valve seat then should not use the mode threadeded with the connection of valve body, and needs with valve
The pattern of holder assembly also arranges certain mechanical connecting structure and fixes valve seat, and in the present embodiment, three open loops that have employed to load in valve body annular groove come
Fixed valve base (2), also ensures to seal with O；The surface of valve seat or valve component is arc surface and the conical surface of both sides is smoothly connected, both sides
The conical surface is then the most identical with the bearing of trend of valve body adjacently situated surfaces after both sides extend, and makes valve seat or valve component and valve body surface coherent formation smoothness mutually
Streamline channel surface；In valve body, the surface at other runner position also uses the fairing ace of smoothness.Lead between valve rod (4) and flap (3)
After crossing threaded screwing, with argon-arc welding seam, both are connected as one.Tail cone (5) is threaded connection the valve body being installed on valve body (1)
The tail end of inner bag (1-2), the basic configuration of tail cone (5) outer surface is the tip bullet towards valve body (1) Way out.
Spring base (12) is fixedly installed in valve body inner bag (1-2) middle part of valve body (1) by bolt (15), as spring (11)
Supporting and guide, also serve as flap (3) and the supporting of valve rod (4) assembly and guide simultaneously.Due to flap (3) and valve rod (4) group
Fit heavier-weight so that easily produce between the spigot surface of valve rod (4) and spring base (12) and pull, the axial-flow type that especially bore is bigger
Check-valves is all the more so, is therefore respectively provided with front fairlead (10) and rear fairlead (16), valve rod at the endoporus at spring base (12) two ends
(4) endoporus of polished rod surface and front fairlead (10), rear fairlead (16) assemble after for being slidably matched, meanwhile, front fairlead (10) and
Rear fairlead (16) and valve rod (4) surface-mounted before all in thermo-chemical treatment carries out surface peening-the present embodiment, front fairlead (10),
The surface of rear fairlead (16) and valve rod (4) all carries out ion Plasma Nitriding Treatment, it is possible to the tension significantly improving the surface that is slidably matched hinders ability.Before
After fairlead (10) and rear fairlead (16) load the installation step hole at spring base (12) two ends, processed in the aperture of the installing hole often held
In annular groove, load hole loads two circlip for holes (17) in circlip (17), each annular groove；Circlip is used to prevent fairlead from taking off
Going out, demolition, installation are quick, facilitate assembling and the maintenance of product, load two circlips in the annular groove outside the most each fairlead, it is possible to increase
Reliability, is prevented effectively from fairlead and is brought away from the installation step hole at spring base (12) two ends under the drive of the valve rod (4) of movement.
For consideration and the needs of raising reliability of spring rate characteristic, the spring (11) of the present embodiment uses and differs in size and rotation direction phase
Two anti-springs are installed in parallel, concentric arrangement inside and outside two springs.First the setting using dual spring is to consider: the spring force of a spring is split as
Allowing two springs jointly share, the cross section of the most each spring is less much than the cross section of an original spring, thus permissible in identical length
Spring is arranged the more number of turns so that the stiffness characteristics of spring can preferably meet the needs of valve working；In addition dual spring is used to be conducive to carrying
High reliability is also apparent from: owing to spring material is through hardening process, bearing when impacting suddenly of valve opening and closing, it is difficult to definitely avoid out
The unexpected situation of existing spring breakage, therefore arranges dual spring and helps guarantee valve and use more reliably.The oppositely oriented benefit of two springs is: spring
Certain torsion can occur when compression and stretching, extension, thus when flap (3) likely can be by the end face of spring during being quickly turned on and off
Driving and rotate, this can increase valve rod, fairlead surface and flap and sealing surface of seat occurs abrasion and abrasive probability.Arrange in valve
After dual spring, need the outside of lateral spring outside that spring overcoat (14) is set and be used as supporting and the guide of outer lateral spring, and by bolt (15)
Compress simultaneously and fix spring overcoat (14) and spring base (12).The setting of dual spring is mainly used in bigbore axial flow type check valve, little
Bore valve due in valve the restriction in space still use single spring structure, now spring outwards is just not required to arrange spring overcoat (14).
As it is shown in fig. 7, the inside of tail cone (5) is cavity--tail cone chamber (5-2), tail cone (5) is provided with by multiple from tail
The tail cone water conservancy diversion group hole (5-3) (seeing Fig. 9) of the through hole composition that the conical outer surface of cone (5) is inside, for the ease of processing, tail cone water conservancy diversion group
Each aperture, outside in hole (5-3) is acted the section of opening milling cutter and is inwardly milled into formation stepped hole at the conical surface, through hole at stepped hole plane the most drill-through to
Tail cone chamber (5-2)；Towards the front end in valve inlet direction on tail cone (5), and it is provided with the tail cone restriction (5-1) of circle；At valve rod
(4) tail end, is provided with the damping lobe (6) of the revolution bodily form, and damping lobe (6) is fixed with nut (7) and spring pad (8), nut (7)
Locking by split pin (9)；When valve wide open, the damping lobe (6) being installed on valve rod (4) tail end is positioned at tail cone chamber (5-2)；Resistance
The diameter of Buddhist nun's lobe cylindrical (6-2) is suitable with the aperture of tail cone restriction (5-1), and the periphery, front side of damping lobe (6) is with the conical surface--damping lobe
Inner cone (6-1).Damping lobe inner cone (6-1) in the present embodiment is the narrower conical surface.
Valve flap structure aspect, from flap (3) anterior crown main part--flap bizet (3-1) backward, is provided with columnar valve
Lobe cylinder (3-3) (see Fig. 6)；In the present embodiment, flap cylinder (3-3) part be in roughing with cylindrical component and flap bizet (3-1)
Rear phase is welded, and becomes an entirety and form flap (3) through polish after both welding, and the external diameter of flap cylinder (3-3) is less than flap bizet
(3-1) maximum outside diameter, is provided with a plane as valve at the maximum outside diameter of flap bizet (3-1) and between flap cylinder (3-3) cylindrical
Spacing plane during lobe (3) standard-sized sheet；The cylindrical of flap cylinder (3-3) part and endoporus--the inner bag pilot hole (1-3) of valve body inner bag (1-2) front end
Coordinate, when flap (3) arrive fully open position time, the spacing plane between aforesaid flap bizet (3-1) and flap cylinder (3-3) cylindrical and
The front plan of valve body inner bag (1-2)--inner bag front end face (1-4) contacts, and makes the fully open position of flap (3) be determined, flap simultaneously
Bizet (3-1) outer surface links up mutually with valve body inner bag (1-2) outer surface, with the water droplet that the outer surface of tail cone (5) three is connected to form smoothness
Shape and fairshaped surface.
It is additionally provided with at the step plane of spring base (12) rear end in multiple connection flap bizet (3-1), flap cylinder (3-3) and valve body
Through hole-the through flow hole (13) between internal cavities and tail cone (5) between gallbladder (1-2).It is provided with bullet when the structure that have employed dual spring
After spring overcoat (14), need to process the through flow hole (13) consistent with spring base (12) in the corresponding position of the step plane of spring overcoat (14).
When medium flows backwards, medium tail cone water conservancy diversion group hole (5-3) from tail cone (5) enters tail cone chamber (5-2), then passes through tail
It is interior that cone restriction (5-1) and through flow hole (13) enter between flap bizet (3-1) and flap cylinder (3-3) and valve body inner bag (1-2)
Portion's cavity；The most substantially not having flow velocity owing to entering into the medium of the internal cavities of flap (3), medium static pressure is gone up the most completely, and flap (3)
The medium in outside is the medium flow backwards at a high speed, and the medium static pressure of a part has been converted into the kinetic energy of medium, thus the medium in flap (3) outside is quiet
The medium static pressure that pressure flap to be less than (3) is internal, pressure differential is added the spring force of spring (11) and flap (3) can be promoted to valve seat (2)
Direction is moved, and makes flap (3) close.
As shown in Figure 10, flap (3) returns when closing, when damping lobe (6) and moving forward to be closer to tail cone restriction (5-1) place, from
The medium of the internal cavities of tail cone chamber (5-2) flap to be entered into (3) starts damped lobe inner cone (6-1) and tail cone restriction (5-1)
Throttling, flow into rate-of flow gradually decrease, due to flap (3) inside and outside pressure medium difference and spring-force driven dual under reach time, flap (3) and
The volume of the internal cavities of valve body inner bag (1-2) is the most extended, when enter this internal cavities medium because of be throttled flow minimizing, can not be timely
When supplementing the extended volume of this internal cavities on demand, because liquid medium is considered incompressible fluid, thus flap (3) and valve
The medium static pressure of the internal cavities of internal gallbladder (1-2) can decline quickly, and the speed of advancement of flap (3) also can comparatively fast decline；In the present embodiment,
The stage that damping lobe (6) starts to throttle is set to remainder stroke and accounts for about the 20% of total travel.Along with the continuation of flap (3) moves forward, when damping lobe
When cylindrical (6-2) initially enters tail cone restriction (5-1) (see Figure 11), the inside that medium enters flap (3) and valve body inner bag (1-2) is empty
The passage in chamber is blocked completely--and the present embodiment damps lobe cylindrical (6-2) and enters stage of tail cone restriction (5-1) and be set to remainder stroke and account for
The 3～about 5% of total travel, owing to medium is incompressible liquid medium, if now passage is blocked completely, can enter entirely without medium
This internal cavities, then flap (3) can at once stop move forward because damping lobe cylindrical (6-2) and tail cone restriction (5-1) between and
All there is fit clearance between flap cylinder (3-3) cylindrical and inner bag pilot hole (1-3), damping lobe cylindrical (6-2) enters tail cone restriction (5-1)
After from this at two gap location still have a certain amount of medium and go successively to, and flap (3) when returning seat to nearly closed position, flap (3) outside is (
The outflow side of flow medium) pressure have dropped to close to atmospheric pressure or drop to the back pressure close to system, thus when at above-mentioned two gap location have on a small quantity
When refluence medium goes successively to the internal cavities of flap (3) and valve body inner bag (1-2), it is straight that flap (3) still can continue reach with slower speed
To closing (Figure 12).Correctly arrange damping lobe cylindrical (6-2) and tail cone restriction (5-1) between and flap cylinder (3-3) cylindrical with interior
On the premise of fit clearance between gallbladder pilot hole (1-3), flap (3) can arrive with required rational Slow Close speed in the final stage closed
Reach sealing surface of seat (2-1) place；Flap (3) is entering into the gradually reduction of speed closing latter end 20% stroke and is closing the aobvious of latter end 3～5% stroke
Write reduction of speed and can very effectively eliminate water hammer and protection sealing surface and valve from impact failure.
Above-mentioned flap closing process embodies Slow Close protection structure proposed by the invention and has mutative damp characteristic.Need noted herein
It is that what the present invention was had disclosure satisfy that, in flap closedown total travel, the mutative damp characteristic that different phase rate controlling requires, is current all kinds of check-valves product
Not available for the various Slow Closes protection structure used.
Check-valves product is full-gear when putting into operation, thus the pressure loss of system will be produced straight by the size of the resistance coefficient of its runner
Connect impact, therefore, during check-valves product design, the resistance coefficient of runner should be reduced while ensureing properties of product by reasonably design as far as possible,
To be current all kinds of check-valves product when design the most out in the cold or a problem failing to cause enough attention for this.The technical scheme is that fall
The resistance coefficient of low valve, the relevant surfaces at runner has carried out some new designs:
The shape of the outer surface of the flap bizet (3-1) that flap (3) is anterior is designed as: middle part for be convex to forward valve body (1) entrance side,
Surface is the circular arc surface of revolution inwardly concaved, and the recessed circular arc surface of revolution is the most then the outwardly circular arc surface of revolution, two sections of circular arcs
The surface of revolution is tangent and forms the streamline channel surface that is smoothly connected.Valve clack sealing surface (3-2) is arranged on connecing of the outwardly circular arc surface of revolution
Nearly outside, slightly protrudes from the surface of this circular arc surface of revolution.
It is connected gusset (1-1) with uniform four between the housing of valve body (1) with valve body inner bag (1-2) to be connected, connects gusset (1-1)
Be shaped as the streamlined platy structure (as shown in Figure 6) that two ends zoom in forward with arc surface.The connection gusset of existing axial flow type check valve product
Two ends are to use flush end or semi-circular ends, can produce vortex when medium flows through at this；The connection gusset two ends of the technical program are with arc surface forward
Zoom in, both ends close to pointed streamlined structure, will not produce when medium flows through these two ends eddy current, can olderly flowage, advantageously reduce runner
Flow resistance.
Above-mentioned flap bizet (3-1) and connect the airflow design on gusset (1-1) surface and aforesaid valve seat or the surface of valve component,
Valve body adjacently situated surfaces uses the surface at fairing ace coherent mutually and valve body other runner position interior to use smooth fairing ace, defines valve
Reasonable, the smooth streamline channel of door, does not has the unexpected change changing suddenly, not having cross section of fluid channel area of flow direction during media flow, because of
And make valve have lower crushing and higher discharge coefficient.
Embodiment two
Different from the medium that the structure of embodiment one is suitable for, axial flow type check valve described in the present embodiment is mainly used in the pipeline of gas medium
In, it is used for preventing medium from flowing backwards.
Owing to gas medium is entirely different with the characteristic of liquid medium, liquid medium is incompressible fluid, and gas medium is compressible fluid,
Thus the Slow Close being applied to this two classes medium protects structure the most different, the Slow Close for gas medium protects structure because medium is compressible fluid
Thus the change to orifice size has hysteresis quality and low-response, Slow Close protection structure is carried out targetedly by the characteristic being required for gas medium
Design.
The technical scheme of the present embodiment have employed, from differing only in of embodiment one, the damping lobe (6) that structure is different, and remaining structure is identical,
State for not making below these mutually isostructural technical schemes to apply, only be allocated as illustrating to the Slow Close mechanism part relating to damping lobe (6).
As shown in Figure 8, the inside of the tail cone (5) being installed on valve body inner bag (1-2) rear end is set to cavity-tail cone chamber (5-2),
The conical surface of tail cone (5) is provided with the group hole-tail cone water conservancy diversion group hole (5-3) (Fig. 9) flowing into tail cone chamber (5-2) for medium,
The front end of tail cone (5) be provided with circle, for medium from tail cone chamber (5-2) flow out and carry out the tail cone restriction (5-1) throttled when Slow Close；
Tail end at valve rod (4) is provided with the damping lobe (6) of the revolution bodily form, and damping lobe (6) compresses with nut (7) and fixes, by split pin (9)
Locking；During valve wide open, damping lobe (6) is positioned at the position of tail cone chamber (5-2) tapered end side partially, the diameter of damping lobe cylindrical (6-2)
Suitable with the aperture of tail cone restriction (5-1), the axial length of damping lobe cylindrical (6-2) is longer than length during liquid medium in embodiment one；?
Damping lobe (6) periphery, front side with the conical surface--damping lobe inner cone (6-1), in the present embodiment damp lobe inner cone (6-1) be axial length relatively
The long conical surface, for throttling to gas medium during Slow Close.When medium flows backwards, certain media enters tail cone chamber (5-2) from tail cone water conservancy diversion group hole (5-3)
Then flap bizet (3-1) and flap cylinder (3-3) and valve body inner bag (1-2) are entered into by tail cone restriction (5-1) and through flow hole (13)
Between internal cavities, the most substantially do not have flow velocity, static pressure to go up owing to entering into the medium of this internal cavities, and flap (3) outside
Medium is the medium flow backwards at a high speed, thus the medium static pressure of medium static pressure flap to be less than (3) inside in flap (3) outside, pressure differential adds
The spring force of upper spring (11) can promote flap (3) to move to valve seat (2) direction and make flap (3) cut out.
As shown in figure 13, promote flap (3) to return when gas medium flows backwards and close, when before the throttling conical surface-damping lobe of damping lobe (6) front side
When the front end of the conical surface (6-1) moves forward to be closer to tail cone restriction (5-1) place, the medium flowed out from tail cone restriction (5-1) start by
Damping lobe inner cone (6-1) and tail cone restriction (5-1) throttling, rate-of flow gradually decrease, when moving forward due to flap (3), and flap
And the volume of internal cavities of valve body inner bag (1-2) is the most extended, when entering the medium of this internal cavities because being throttled flow minimizing, then (3)
The medium static pressure of the internal cavities of flap (3) and valve body inner bag (1-2) can be gradually reduced, and the speed of advancement of flap (3) also can decline.
In the present embodiment, the stage that damping lobe (6) starts to throttle is set to remainder stroke and accounts for the 35～about 40% of total travel.Along with continuing of flap (3)
Continuous reach, damping lobe cylindrical (6-2) initially enters tail cone restriction (5-1) (see Figure 14), and medium enters flap (3) and valve body inner bag (1-2)
The passage of internal cavities blocked completely--the present embodiment damps lobe cylindrical (6-2) and enters stage of tail cone restriction (5-1) and be set to remain
Remaining stroke accounts for the 10～about 15% of total travel, due to flap (3) flap (3) outside (stream of refluence medium when returning seat to nearly closed position
Go out side) pressure have dropped to close to minimum, thus flap (3) still can continue reach with certain speed, is enclosed in flap (3) and valve body
The medium of the internal cavities of gallbladder (1-2) therefore and by gradually dilatation makes the pressure in cavity decline, and makes flap (3) slow down until closing (Figure 15).
The setting of above-mentioned Slow Close protection can protect sealing surface and valve from impact failure effectively.
Embodiment two protects structure only to damp lobe (6) for the Slow Close protection structure of gas medium with the Slow Close for liquid medium of embodiment one
Structure different, and two kinds of dampings lobe (6) are the most identical with the attachment structure of valve rod (4) and size, thus can be according to the difference of medium
State and select and be built with specific aim, suitability more preferable Slow Close protection structure while be also convenient for organization of production.
Slow Close that technical scheme is proposed protection structure has the advantage of simple in construction, this structure in number of parts only than without delaying
The conventional structure closing protection adds a part-damping lobe, thus product manufacturing is simple, production cost is low.The product purchased as user does not has
Slow Close protection is when requiring, band Slow Close protection structure and the most relatively simple without the conversion when assembling of the product of conventional structure of Slow Close protection, as long as
Valve stem end do not fill damping lobe, the tail cone restriction position of tail cone front end is removed by turning by pattern requirement simultaneously after assemble, just constitute symbol
Close the product that the conventional structure product design document without Slow Close protection requires, as shown in Figure 16.
Because the Slow Close protection structure of the present invention is arranged in valve cavity, and the working media of Slow Close protection mechanism is operating mode medium, thus valve
Door is without exposing oil pipeline and medium bypass pipe, and product is not easy to produce damage in installing and using, and without oiling, and the most there is not bypass pipe
Blocking and frozen problem；Due on valve without external structure, thus do not exist external leakage hidden danger and do not exist filler frictional resistance hinder flap motion
Problem；Protecting due to the Slow Close of the present invention is the most not the piston rod by clashing into and promote slow-closing structure during flap nearly closed position,
The most there is not impact and collision and the jam of part of flap and Slow Close mechanism or pull, the work of Slow Close protection structure is the most reliable；Because it is slow
Closing protection structure is embedding structure, and without nonmetallic sealing member, thus the operating temperature of valve can not be limited, it is only necessary to according to operating temperature and
Other characteristic of medium selects corresponding part material, and valve just can be made to work under required any operating temperature.
Above in association with drawings and Examples, technical scheme made specific description, but these accompanying drawings and explanation have not made sense
For limiting the scope of the present invention.Those skilled in the art should know, and the present invention is not limited by above-described embodiment and accompanying drawing, its protection
Scope is defined by appending claims, any various changes in the range of being defined without departing from claims of the present invention, modification institute shape
The technical scheme become, all without departing from spirit and the technical spirit of the present invention, within still belonging to scope of the presently claimed invention.
Claims (10)
1. closing a low flow resistance axial flow type check valve for latter end band Slow Close defencive function, it includes valve body (1), flap (3), is positioned at valve body (1)
Entrance side inwall the valve seat (2) being tightly connected with valve body (1), the valve rod (4) connected as one with flap (3) by screw thread and weld seam, peace
It is loaded on the damping lobe (6) of valve rod (4) tail end, is threaded connection valve body inner bag (1-2) tail end and the base of outer surface being installed on valve body (1)
Originally be shaped as tip towards the taper of valve body (1) Way out tail cone (5), be fixedly installed in the valve body inner bag (1-2) of valve body (1)
The spring base (12) in chamber and spring (11), it is characterised in that: the inside of tail cone (5) is cavity--tail cone chamber (5-2), tail cone (5)
On be provided with tail cone water conservancy diversion group hole (5-3) being made up of multiple through holes inside from its conical outer surface, towards valve inlet on tail cone (5)
The front end in direction is provided with the tail cone restriction (5-1) of circle, when valve wide open, is installed on the damping lobe of the revolution bodily form of valve rod (4) tail end
(6) tail cone chamber (5-2) it is positioned at；Flap (3) anterior crown flap main part--flap bizet (3-1) is provided with circle backward
The flap cylinder (3-3) of tubular, the cylindrical of flap cylinder (3-3) and valve body inner bag (1-2) front end endoporus--inner bag pilot hole (1-3) is joined
Close；Multiple connection flap bizet (3-1), flap cylinder (3-3) and valve body inner bag (1-2) it is additionally provided with at the step plane of spring base (12) rear end
Between internal cavities and tail cone (5) between through hole-through flow hole (13).
The low flow resistance axial flow type check valve of closedown latter end band Slow Close defencive function the most according to claim 1, it is characterised in that: described valve
Being shaped as of the outer surface of the flap bizet (3-1) that lobe (3) is anterior: middle part is for be convex to valve body (1) entrance side, surface for inwardly concaving forward
The circular arc surface of revolution, the recessed circular arc surface of revolution is the most then for the circular arc surface of revolution that bulges, and two sections of circular arc surfaces of revolution are tangent and shape
Become the streamline channel surface being smoothly connected.
The low flow resistance axial flow type check valve of closedown latter end band Slow Close defencive function the most according to claim 1, it is characterised in that: described resistance
The outside diameter of Buddhist nun's lobe (6) is suitable with the aperture of tail cone restriction (5-1).
The low flow resistance axial flow type check valve of closedown latter end band Slow Close defencive function the most according to claim 1, it is characterised in that: described resistance
The periphery, front side of Buddhist nun's lobe (6) is with the conical surface.
The low flow resistance axial flow type check valve of closedown latter end band Slow Close defencive function the most according to claim 1, it is characterised in that: valve body (1)
Housing and valve body inner bag (1-2) between be connected with uniform several gussets (1-1) that are connected, connect gusset (1-1) be shaped as two ends with
The streamlined platy structure that arc surface zooms in forward.
The low flow resistance axial flow type check valve of closedown latter end band Slow Close defencive function the most according to claim 1, it is characterised in that: described tail
It is the stepped hole that milling cutter is inwardly milled at the conical surface that the section of opening is acted in the aperture, outside of cone water conservancy diversion group hole (5-3), and through hole is the most drill-through at stepped hole plane
To tail cone chamber (5-2).
The low flow resistance axial flow type check valve of closedown latter end band Slow Close defencive function the most according to claim 1, it is characterised in that: described
Be respectively arranged with front fairlead (10) and rear fairlead (16) at the endoporus at spring base (12) two ends, the polished rod surface of valve rod (4) with leading to
Set (10), rear fairlead (16) endoporus assembling after for being slidably matched；Front fairlead (10) and rear fairlead (16) and the table of valve rod (4)
All surface peening is carried out through thermo-chemical treatment before the assembling of face.
The low flow resistance axial flow type check valve of closedown latter end band Slow Close defencive function the most according to claim 1, it is characterised in that: front fairlead
(10) and rear fairlead (16) load spring base (12) two ends installation step hole after, in the annular groove that the aperture of the installing hole often held is processed
Two circlip for holes (17) are loaded in loading circlip for hole (17), each annular groove.
The low flow resistance axial flow type check valve of closedown latter end band Slow Close defencive function the most according to claim 1, it is characterised in that: described valve
Flap cylinder (3-3) part of lobe (3) is for be welded mutually after roughing with cylindrical component and flap bizet (3-1), after both welding
Become an entirety and form flap (3) through polish.
The low flow resistance axial flow type check valve of closedown latter end band Slow Close defencive function the most according to claim 1, it is characterised in that: arrange in valve
There are inside and outside concentric arrangement, oppositely oriented dual spring.
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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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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104990118B (en) * | 2015-08-03 | 2018-03-27 | 广东美的厨房电器制造有限公司 | Check-valves and lampblack absorber |
| CN107339471B (en) * | 2017-02-09 | 2023-08-08 | 上海冠龙阀门自控有限公司 | Diaphragm 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 |
| CN110259996B (en) * | 2018-03-12 | 2020-07-17 | 中国航发商用航空发动机有限责任公司 | Normally closed check valve for air pipeline of aircraft engine |
| 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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| US8312893B2 (en) * | 2008-05-02 | 2012-11-20 | Control Components, Inc. | Axial drag valve with internal hub actuator |
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| EP0066795B2 (en) * | 1981-06-01 | 1991-01-23 | Alsthom | Fast closing valve for a compressible fluid |
| CN201462114U (en) * | 2009-07-10 | 2010-05-12 | 上海华通阀门有限公司 | Slow-closure axial-flow check valve |
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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 |