CN209213030U - A kind of double sealing structure in pressure balance type regulating valve - Google Patents

Abstract

The utility model relates to a kind of double sealing structures in pressure balance type regulating valve, spool, floating valve seat, lower sleeve and the upper bush being placed on lower sleeve including being equipped with upper sealing surface and lower sealing surface.In spool insertion floating valve seat in the spool bore that sets, on floating valve seat inner sidewall be equipped with sealing surface of seat at the upper sealing surface cooperation of spool, in medial wall of the tube of trapping with lower sleeve sealing surface is equipped at spool lower sealing surface cooperation.The inner hole of upper bush and lower sleeve is stepped hole, floating valve seat is located on lower sleeve First terrace by annular notch and its outer circumference surface is matched with the stepped hole of upper and lower sleeve, spacing distance and equipped with elastomer between floating valve seat annular notch and First terrace.The utility model uses split type upper and lower sleeve, and floating valve seat is arranged wherein, overcomes the low featuring rigid cutting-off problem for being unable to satisfy live high temperature and high pressure condition condition lower valve of HCB double valve seat adjustable valve leakage class in the prior art.

Description

A kind of double sealing structure in pressure balance type regulating valve

Technical field

The utility model belongs to valve technology field, especially a kind of double density sealed knot in pressure balance type regulating valve Structure.

Background technique

The experience accumulation of many years automation control is summarized by CV3000 series regulating valve Shan Wu company, Japan, develops the small-sized of formation High-performance regulating valve, domestic regulating valve manufacturer introduce the technology from Japanese mountain force-Honeywell AG in the eighties, at present Until it is domestic there are also 80% regulating valve manufacturing enterprises still based on CV3000 regulating valve product technology, other CV3000 regulating valve The product parts all till now from the eighties have formd a complete industrial chain, so this is also that numerous domestic is adjusted Valve manufacturer continues the reason of producing product of the CV3000 for major technique, has a kind of HCB cage in CV3000 regulating valve series of products The model of formula regulating valve, this regulating valve are a kind of regulating valves of pressure balance type, adjust flow, flow by the window of sleeve Greatly, the advantages that adjustable extent is wide, and rating curve precision is high, and dynamic stability is good, low noise, but this regulating valve designs For double-valve-seat hard sealing structure (as shown in Figure 1, Figure 2), normal leakage grade can only achieve three-level, valve leakage rate under full off state Greatly, the leakage class for being far from satisfying modern chemical industry apparatus-valve door requires, and control valve water leakage is one Important exfactory inspection, type inspection gainer and control valve installation before test emphasis and On-line funchon safety Ensure basis, manufactory, design side and user especially pay close attention to this.High-leakage grade can not be accomplished by analyzing its this kind of regulating valve It is required that basic reason be that such control valve is designed as the structure of two valve base sealings, two valve seats are all fixed hard close Seal structure, under spool full off state, two sealing rings contact on two sealing surfaces and valve seat on spool reaches sealing Effect, because there is machining error always, two sealing surfaces can not contact simultaneously always, always have a sealing surface first to connect Touching another sealing surface, vacantly namely the final thrust output of executing agency acts on two valve seats respectively, the two valves Seat sealing force is unevenly distributed and causes a valve seat stress big, and a valve seat stress is small to be led without enough sealing forces sealing It causes, conventional way is that two sealing surfaces is allowed to contact by way of grinding simultaneously, although valve seat passes through certain time and grinding Mill can accomplish to have accomplished strict contact before assembly with spool, but when valve machine assembly is got up sleeve by The pressing force of upper valve bonnet bolt, colleting deformation causes also to generate corresponding deformation at two sealing surface of seats, so needing anti- Multiple dismounting and grinding gets to the levels of leakage of level Four, in addition at the scene in use process internals by manifold pressure Effect and medium temperature alternating variation valve internals biggish deformation can also occur, so this product can not reach always it is high The requirement of leakage class.

Utility model content

HCB double valve seat adjustable valve leakage etc. is solved in the prior art technical problem to be solved by the utility model is: overcoming The low featuring rigid cutting-off problem for being unable to satisfy live high temperature and high pressure condition condition lower valve of grade provides a kind of used in pressure balance type tune Save the double sealing structure in valve.

The technology employed by the present utility model is a kind of double sealing structure in pressure balance type regulating valve, Spool, floating valve seat, lower sleeve and the upper bush being placed on lower sleeve including being equipped with upper sealing surface and lower sealing surface.Upper set The female coaxial setting of the inner hole and lower sleeve of cylinder, and the inner hole of upper and lower sleeve is stepped hole, upper bush inner hole includes being located at The mesoporous of bottom, the aperture above mesoporous are connected between mesoporous and aperture by step surface.Lower sleeve inner hole includes being located at Macropore at the top of it and the mesoporous below macropore, macropore are connect with mesoporous by First terrace.

Floating valve seat is located in the stepped hole of lower sleeve, and its bottom outside is equipped with an annular notch, inside open up Spool bore is located at outer peripheral surface and upper bush mesoporous side wall and lower sleeve macropore side wall above annular notch and cooperates, and annular lacks Mouthful top spool bore inner sidewall on at the upper sealing surface cooperation of spool be equipped with sealing surface of seat, annular notch roof and first Between step surface spacing distance and be equipped with elastomer, the both ends of the elastomer respectively with annular notch roof and First terrace Elasticity abuts；Guiding straight section ι is equipped at the spool bore port.It is equipped in medial wall of the tube of trapping at spool lower sealing surface cooperation Lower sleeve sealing surface.The flow that valve is corresponded on lower sleeve side wall adjusts window.

Adjust under valve closing state, the upper sealing surface of spool and sealing surface of seat close fit, the lower sealing surface of spool with It is clearance fit at lower sleeve sealing surface close fit, spool and spool guiding straight section cooperation, and gap≤0.1mm；It is floating Axial sealing mechanism is equipped between side wall and lower sleeve at valve cup ring v notch v, and side wall is the thin-walled ring with a thickness of 3-5mm Structure.

Advanced optimize, the interior stepped hole of lower sleeve further includes the aperture below the mesoporous, connection mesoporous and The step surface of aperture is second step face, and the axial sealing mechanism includes that the ring-shaped graphite sealing on second step face is filled out The top of material, the graphite grazing filler is equipped with hold-down grid, and hold-down grid includes canister portion and the convex annular set on canister portion top Edge, hold-down grid are set in the annular notch of floating valve seat, and the canister portion bottom end face of hold-down grid abuts graphite grazing filler, The both ends of elastomer are abutted with the annular flange top end surface elasticity of the annular notch roof of floating valve seat and hold-down grid respectively. When elastomer compression, the reaction force acts of elastomer remain close to graphite on hold-down grid, through hold-down grid Packing material applies a sealing force, and the other end of elastomer is acted on floating valve seat and pushed away to upward counter of floating valve seat one Power.

The elastomer further optimized is spring, and the floating valve seat annular notch roof is uniformly provided at least 6 bullets Spring location hole, the spring are set in location hole of the spring.The design of floating valve seat annular notch roof has equally distributed spring fixed Position hole, and places a certain number of springs (preferably cylindrical spring) so that floating valve seat uniform force and can steady downlink, then In conjunction with lower spring end elasticity abutting hold-down grid, several groups of airtight and watertight paddings designed between floating valve seat and the mating surface of lower sleeve, The sealing for further ensuring mating surface between valve seat and lower sleeve, prevents medium from leaking from there.

In addition, upper bush end face can also set a groove, gasket is installed in groove, to prevent upper bush and lower sleeve it Between contact face leak.

The beneficial effects of the utility model are: 1) tube-in-tube structure of original monoblock type is changed to split type upper bush and trapped The structure of cylinder, design has a floating valve seat structure between upper bush and lower sleeve, the periphery of floating valve seat and upper bush and traps The interior stepped hole cooperation of cylinder guarantees the positioning and guiding between this upper and lower and three part of floating valve seat with this, guarantees these three The requirement of inner bore of part and outer circle concentricity.2) it spacing distance and is set between floating valve seat annular notch roof and First terrace Elastomer is set, can make to continue traveling downwardly and make spool lower sealing surface and lower sleeve close after sealing face contact sealing surface of seat on spool Cooperation is sealed between cover, while elastomer gives floating valve seat upward active force, and then promote sealing surface and valve on spool Sealing cooperation between seat sealing surface.In addition, the pressure of medium (fluid) acts on floating in regulating valve under valve-closed state On seat bottom portion end face, and then it is transmitted at sealing surface of seat, so the sealing force of floating valve seat is the resultant force of two kinds of active forces, Ensure that double-beat drop valve has certain valve base sealing power by the design of this structure.3) sealing surface of seat of floating valve seat The spool bore of top is designed as guiding straight section, and with spool clearance fit, and gap≤0.1mm, such design structure make When spool is opened, spool can rapidly be detached from floating valve seat, and also avoid the locking phenomenon between spool and floating valve seat Generation.4) overall construction design graphite grazing filling-material structure, in conjunction with thin-walled ring structure, so that when internal part because of pressure It is deformed under the action of power temperature, thin-walled ring structure is easier the shape according to spool figure when spool and floating valve seat contact And self-adaptation type deformation occurs, so that two kinds of faces tightly contact, it effectively prevent medium to leak on the outside of spring base, the utility model Product structure leakage class can reach a high temperature the level of Pyatyi leakage rate under operating condition, can be to being fully met factory's featuring rigid cutting-off Crucial occasion, and can guarantee its valve long period reliability service.

Detailed description of the invention

Fig. 1 is the double sealing structure schematic diagram in background technique in conventional H CB regulating valve of two-seater；

Fig. 2 is the spool in Fig. 1；

Fig. 3 is the structural representation of the double sealing structure being used in pressure balance type regulating valve in the utility model embodiment Figure；

Fig. 4 is the structural schematic diagram of the floating valve seat in Fig. 3；

Fig. 5 is the structural schematic diagram of the upper bush in Fig. 3；

Fig. 6 is the structural schematic diagram of the lower sleeve in Fig. 3；

Fig. 7 is the structural schematic diagram of the hold-down grid in Fig. 3.

In figure: 1. spools, sealing surface on 1-1. spool, 1-2. spool lower sealing surface, 2. floating valve seats, 2-1. valve seat are close Cover, 2-2. floating valve seat " convex " shape shoulder, 2-3. floating valve seat " convex " shape body portion, 3. lower sleeves, 3-1. lower sleeve sealing surface, 3-2. First terrace, 3-3. second step face, 4. upper bushes, 4-1. groove, 5. water outlets, 6. graphite grazing fillers, 7. fill out Expect pressing plate, 7-1. hold-down grid convex body portion, 7-2. hold-down grid convex shoulder, 8. gaskets.

Specific embodiment

The utility model is described in further detail presently in connection with attached drawing.These attached drawings are simplified schematic diagram, Only illustrate the basic structure of the utility model in a schematic way, therefore it only shows composition related with the utility model.

See Fig. 2 to Fig. 7, a kind of double sealing structure in pressure balance type regulating valve is set in the adjusting valve body There are spool 1, floating valve seat 2, lower sleeve 3 and upper bush 4, wherein spool 1 is equipped with upper sealing surface 1-1 and lower sealing surface 1-2, on Sleeve 4 is placed on lower sleeve 3, and flange is arranged in 4 top outer of upper bush, and flange is arranged in the outside of lower sleeve 3, and upper bush is under Sleeve 3 is fixed in valve body by flange.The female coaxial setting of the inner hole and lower sleeve of upper bush, upper bush inner hole is platform Rank hole, the macropore including being located at top, the aperture below macropore and the mesoporous below aperture pass through between adjacent holes Step surface connection.The inner hole of lower sleeve is also stepped hole, including being located at the macropore at the top of it, the mesoporous below macropore, greatly Hole is connect with mesoporous by First terrace 3-2, and mesoporous is connect with aperture by second step face 3-3.Outside floating valve seat 2 Circumferential surface is cylindrical curved surface and its bottom outside is equipped with an annular notch, i.e., it is in be inverted " convex " shape, annular notch that floating valve seat 2 is whole The position of top is " convex " shape shoulder 2-2, and annular notch side wall is " convex " shape body portion 2-3, and its sidewall thickness is 3- 5mm。

Floating valve seat 2 is located in the stepped hole of lower sleeve, the outer peripheral surface of " convex " shape shoulder and upper bush mesoporous and under The cooperation of sleeve macropore side wall, on the spool bore side wall in " convex " shape shoulder with valve base sealing is equipped at the upper sealing surface cooperation of spool Face 2-1, between " convex " shape shoulder bottom end face and First terrace spacing distance and be equipped with elastomer, the elastomer of the present embodiment For cylindrical spring, specifically, the bottom of floating valve seat " convex " shape shoulder be uniformly provided with 8 location hole of the spring (namely blind hole, generally Spring eye number is set according to valve aperture size, generally 6-12 is a), spring is set in location hole of the spring.

Axial sealing mechanism is equipped between floating valve seat " convex " shape body portion and lower sleeve, axial sealing mechanism includes being set to Ring-shaped graphite airtight and watertight padding 6 on second step face.The top of graphite grazing filler 6 is equipped with hold-down grid 7, and hold-down grid 7 wraps Canister portion and the annular flange set on canister portion top are included, i.e. hold-down grid 7 is whole in " convex " shape structure is inverted, and canister portion is filler " convex " shape body portion 7-1 of pressing plate 7, annular flange are " convex " shape shoulder 7-2 of hold-down grid 7, and hold-down grid 7 is set in floating In dynamic valve seat " convex " shape body portion, the bottom end face of convex body portion 7-1 abuts graphite grazing filler 6, " convex " shape shoulder 7-2 Between " convex " shape shoulder 2-2 and First terrace 3-2 of floating valve seat.One end of above-mentioned spring and the roof of location hole of the spring Elasticity abuts, and the other end of spring is abutted with " convex " shape shoulder top end surface elasticity of hold-down grid 7.

The spool bore matched with spool outer peripheral surface is equipped in floating valve seat 2, spool 1 is inserted into spool bore, spool nose end Mouthful place is equipped with 3 degree (generally may be selected 3-5 degree) of lead-in angle α, on spool bore inner sidewall with set at the upper sealing surface cooperation of spool There is sealing surface of seat 2-1.Part of the spool bore between lead-in angle and sealing surface of seat is guiding straight section ι, in order to spool The guiding length for importing and being oriented to straight section ι is 3mm (2-3mm generally may be selected), is oriented to straight section and spool clearance fit ,≤ 0.1mm.In the medial wall of the tube of trapping at spool lower sealing surface cooperation be equipped with lower sleeve sealing surface 3-1.

Radial sealing mechanism is set between lower sleeve 3 and the contact surface of upper bush 4, specifically, the bottom end face of lower sleeve 3 Annular groove is set, places Gask-O-Seal 8 engaged therewith in groove.It is located at lower sleeve sealing surface and the on lower sleeve side wall Water outlet 5, the corresponding valve body water outlet of water outlet 5 are offered between two step surfaces.

When valve is opened to maximum, the top end surface of " convex " shape shoulder of floating valve seat 2 is by the small for connecting of upper bush 4 The limit of the step surface of hole and mesoporous, and the side wall of the step surface is as the guide surface matched with 2 outer peripheral surface of floating valve seat.It floats " convex " shape body portion bottom end of valve seat 2 is located at the bottom part down of graphite grazing filler 6.

When valve is closed, the upper sealing surface of spool is first contacted with the sealing surface of seat 2-1 of floating valve seat 2, contacts back valve core 1 Continue to move down, the lower sealing surface and lower sleeve sealing surface after floating valve seat compressed spring about moves 3mm or so, on spool The thrust downward to spool of contact, executing agency's output subtracts the sealed pressure that spring compression force is exactly lower sealing surface, valve seat Sealing force by spring opposition provide, ensure that having for double-beat drop valve is certain by the design of this structure Valve base sealing power adjusts the compressing force of spring and then also just has adjusted the sealing force to lower sleeve sealing surface, so by this What the design of structure ensured that double-beat drop valve has certain valve base sealing power.

It is enlightenment, through the above description, related work people with the above-mentioned desirable embodiment according to the utility model Member can carry out various changes and amendments in the range of without departing from this item utility model technical idea completely.This item is real It is not limited to the contents of the specification with novel technical scope, it is necessary to its technology is determined according to scope of the claims Property range.

Claims (3)

1. a kind of double sealing structure in pressure balance type regulating valve, it is characterised in that: including being equipped with upper sealing surface under Spool (1), floating valve seat (2), lower sleeve (3) and the upper bush (4) being placed on lower sleeve of sealing surface；The upper bush and Lower sleeve be coaxially disposed stepped hole, the stepped hole of upper bush include positioned at bottom mesoporous and the aperture above mesoporous, in It is connected between hole and aperture by step surface；Lower sleeve stepped hole include macropore at the top of it and below macropore in Hole, macropore are connect with mesoporous by First terrace (3-2)；

The floating valve seat (2) is located in the stepped hole of lower sleeve, and an annular notch is equipped on the outside of its bottom end face, in Portion opens up spool bore, and the macropore side wall for being located at outer peripheral surface and upper bush mesoporous side wall and lower sleeve above annular notch is matched It closes, is equipped with sealing surface of seat (2-1) at the upper sealing surface cooperation of spool on spool bore inner sidewall, annular notch roof and first Between step surface spacing distance and be equipped with elastomer；Guiding straight section ι is equipped at the spool bore port；The medial wall of the tube of trapping It is equipped with lower sleeve sealing surface (3-1) at upper and spool lower sealing surface cooperation, the valvular flow tune of lower sleeve sidewall design It saves window (5)；

It adjusts under valve closing state, the upper sealing surface (1-1) and sealing surface of seat (2-1) close fit of spool, it is close under spool It is clearance fit at cover (1-2) and lower sleeve sealing surface (3-1) close fit, spool and spool guiding straight section cooperation, and Gap≤0.1mm；The position of floating valve seat annular bottom of the gap is the thin-walled ring structure with a thickness of 3-5mm, thin-walled ring and lower sleeve Between be equipped with axial sealing mechanism.

2. the double sealing structure according to claim 1 in pressure balance type regulating valve, it is characterised in that: under described The interior stepped hole of sleeve (3) further includes the aperture below the mesoporous, and the step surface for connecting mesoporous and aperture is second Terrace (3-3), the axial sealing mechanism include the ring-shaped graphite airtight and watertight padding (6) on second step face, the graphite The top of airtight and watertight padding is equipped with hold-down grid (7), and the hold-down grid (7) includes canister portion and the convex annular set on canister portion top Edge, the hold-down grid (7) are set in the annular notch of floating valve seat, and its bottom end face abuts graphite grazing filler (6), The both ends of the elastomer are elastic with the annular flange top end surface of the annular notch roof of floating valve seat and hold-down grid respectively It abuts.

3. the double sealing structure according to claim 2 in pressure balance type regulating valve, it is characterised in that: the bullet Property body be spring, the floating valve seat annular notch roof is uniformly provided at least six location hole of the spring, and the spring is set to spring In location hole.