CN205618708U - Corrugated pipe gate valve - Google Patents

Abstract

The utility model discloses a corrugated pipe gate valve, its technical scheme main points are, and bellows one end is fixed to be set up on the flashboard, and the other end is fixed to be set up on the valve gap, and the deflection of bellows is more than or equal to the stroke of valve rod. Abandoned original upper and lower corrugated header, the valve gap is the corrugated header promptly, and the flashboard is corrugated header down promptly, even if the pressure in the valve pocket exceedes the design limit of valve rod intensity, the valve rod is located whole section power that receives of valve pocket and can be equallyd divide above the bellows to reduce the cracked possibility of valve rod, even if because excessive frequent atress results in the valve rod fracture, also because flashboard and valve gap in the bellows joint, just also can take out the flashboard in the valve pocket easily, simultaneously, the stability that the gate valve is sealed can be ensured to the bellows that still remains.

Description

Bellows gate valve

Technical field

This utility model relates to a kind of valve, more specifically, it relates to a kind of bellows gate valve.

Background technology

There are some bellows gate valves in the market, bi-bellow valve, the Bellows valve of Application No. CN201420389999.9 such as Application No. CN201310485496.1, it it is all sheathed upper and lower corrugated header on valve rod, corrugated tube is fixed, to improve sealing and the stability of gate valve between upper and lower corrugated header.

But, gate valve rod is the vitals of valve, for transmission, above connects actuator or handle, and band movable valve plug moves or rotates directly below, to realize valve switch or regulation effect.Valve rod the most still movement parts, stressed member during valve opening and closing, and be sealing member, meanwhile, it, by the impact of medium and corrosion, also produces friction with filler.Valve rod is consumable accessory, and fracture typically occurs in upper and lower thread root, and sectional area is minimum herein, easily occurs that stress is concentrated and the phenomenon that exceeds standard.

The accident broken at valve rod acme thread escape after the most repeatedly occurring DN150 electric gate valve to open such as certain power plant.Investigation finds, the valve gap pre-load nut of valve loosens, and valve gap moves, and valve stem nut blocks, it is clear that this is that Denso stroke debugged position, protects the excessive accident caused of moment.

Also having flashboard not yet to depart from valve seat, valve rod i.e. ruptures at up or down thread root.Its reason is commonly referred to be flashboard and blocks, and this is partly cause or secondary cause in fact.One major reason is the exception boosting after valve body lumen is closed, that is after valve closing, the lumen fluid pressure being closed between upstream and downstream both sides sealing face is far above the phenomenon of upstream pressure.Produce this phenomenon and have two kinds of reasons: one lumen fluid is expanded by upstream fluid heat temperature raising, causes pressure acutely to raise；Its two flashboards turn-off transient fluid is closed in lumen, it is impossible to outflow, middle cavity space is pressed further by by valve rod, owing to the compressibility of liquid is extremely limited, also can make increased pressure.Meanwhile, its abnormal boosting typically can become geometrical progression to increase, considerably beyond the valve rod Intensity Design limit.Gate valve rod deformation valve rod bending is generally present in electrically operated valve Denso and debugged the most at that time, and as closed, moment is excessive does not sets again stroke protection or imbalance etc., and it is the biggest to the destruction of valve.

Because being provided with corrugated header and corrugated tube at valve rod interlude, causing corrugated tube stress when, the valve rod of this section also have received extra power, whole valve rod different parts discontinuity, adding foregoing reason, the valve rod that may result in bellows gate valve is more prone to fracture.Existing bellows gate valve, improvement direction is substantially based on how improve the performance of corrugated tube, the problem of sealing and stability to improve whole gate valve, but does not the most propose how to solve the problem that gate valve rod is easily broken.

Utility model content

The deficiency existed for prior art, the purpose of this utility model is to provide a kind of bellows gate valve, it is possible not only to guarantee the stability of Gate-valve sealing, more enable to the valve rod the most not easy fracture of gate valve, even if valve stem crack is also not result in that the situation that valve seat is difficult to detach in valve body occurs.

For achieving the above object, this utility model provides following technical scheme:

A kind of bellows gate valve, including valve body, valve gap, valve rod, flashboard, corrugated tube, the fixing connection of valve pocket and valve seat, valve body and valve gap, valve rod one end and flashboard it is formed with in valve body, the other end stretches out valve gap and has been connected executive component, the flashboard oscilaltion formation with valve rod and the closure or openness of valve seat, described bellows-sheathed is outside valve rod, and described corrugated tube one end is fixedly installed on flashboard, the other end is fixedly installed on valve gap, and the deflection of corrugated tube is more than or equal to the stroke of valve rod.

By using technique scheme, abandon original upper and lower corrugated header, valve gap is corrugated header, flashboard is lower corrugated header, even if the pressure in valve pocket exceedes the design limit of valve rod intensity, valve rod is positioned at whole section of suffered power of valve pocket and can be assigned to above corrugated tube, thus reduces the probability of valve stem crack；Even if because the stress of too frequent causes valve stem crack, also because corrugated tube is connected to flashboard and valve gap, flashboard can be taken out in valve pocket the most easily；Meanwhile, the corrugated tube still retained is able to ensure that the stability of Gate-valve sealing.

This utility model is further arranged to, and described valve rod central axis overlaps with bellows core axis.

By using technique scheme, valve rod is positioned at whole section of suffered power of valve pocket and can uniformly be assigned to above corrugated tube, and during valve rod oscilaltion simultaneously, the deformation of corrugated tube is stable, improves sealing and the service life of corrugated tube of gate valve.

This utility model is further arranged to, and described valve rod is provided with screw thread and is positioned at the escape of thread head, is welded with the stress ring that shape size is the most suitable in described escape, is fixed with even power component between stress ring and corrugated tube.

By using technique scheme, the setting of stress ring so that can be decomposed on corrugated tube by stress ring and even power component during stress at valve rod escape, thus prevent valve stem crack；On the other hand, even if valve stem crack, it is also possible to by stress ring and even power component so that valve rod and corrugated tube, corrugated tube and flashboard still link together, it is possible to taken out in valve body by flashboard simply and easily.

This utility model is further arranged to, and described even power component is elastic component and is at least symmetrically distributed in two of stress ring axial direction both sides.

By using technique scheme so that no matter valve rod is in uphill process, or during declining, suffered power can decompose on corrugated tube by even power component, to reduce the power that valve rod is subject to, prevents the situation of valve stem crack from occurring.

This utility model is further arranged to, and even power component includes vertical section and two bifurcated sections, the free end of the vertical section fixing connection stress ring of Y-shaped structure cohesion, and the free end of two bifurcated sections is fixing connects corrugated tube.

By using technique scheme so that stress ring and even power component, bifurcated section and corrugated tube all define and be reliably connected, and two bifurcated sections play the effect of uniform decomposition power.

In sum, bellows gate valve of the present utility model, by the position change of two ends of corrugated tube, on the basis of originally only playing sealing function, also add the power can shared suffered by valve rod, it is to avoid valve stem crack, extend the service life of valve rod；Meanwhile, the even power component increased so that valve rod can decompose the power of valve rod during oscilaltion and goes to share to corrugated tube.

Accompanying drawing explanation

Fig. 1 is the structure sectional view of this utility model bellows gate valve；

Fig. 2 is the A portion enlarged drawing of Fig. 1.

Reference: 1, valve body；11, valve pocket；12, valve seat；2, valve gap；3, valve rod；31, vertical section is moved back；82, bifurcated section.

Detailed description of the invention

Embodiment of the present utility model is described further by 1-2 referring to the drawings.

As shown in Figure 1, bellows gate valve, including valve body 1, valve gap 2, valve rod 3, flashboard 4 and corrugated tube 5, valve pocket 11 and valve seat 12 it is provided with in valve body 1, valve gap 2 and the fixing connection of valve body 1, valve rod 3 one end and the fixing connection of flashboard 4, the other end stretches out valve gap 2 and the executive component 6(such as handwheel of driving valve rod 3 oscilaltion that is connected), flashboard 4 together rises along with valve rod 3 and is mutually disengaged the unlatching forming gate valve with valve seat 12, and flashboard 4 together declines along with valve rod 3 and is mutually inserted the cut out forming gate valve with valve seat 12.

It is crucial that, corrugated tube 5 is enclosed within outside valve rod 3 and the two central axis overlaps, corrugated tube 5 one end uses fixing connection valve gap 2, the other end is fixed connection flashboard 4(and is the most preferably connected to the upper end of flashboard 4, this end face is valve rod 3 and forms, with flashboard 4, the face, place, demarcation line being connected, as arranged groove in upper end, it is welded in groove, it is ensured that valve rod 3 is in all sites uniform force within valve pocket 11) corrugated tube 5 end adapter., being obstructed for avoiding valve rod 3 to move up and down, the deflection of corrugated tube 5 should be more than or equal to the stroke of valve rod 3 oscilaltion meanwhile.

Under normal circumstances, valve rod 3 nut can be set at valve gap 2, valve rod 3 can arrange external screw thread, by both cooperations so that the circumferential movement of executive component 6 is converted into the axially-movable of valve rod 3.When valve rod 3 processes external screw thread, inevitably need to arrange escape 31.Gate valve in the course of the work, is easiest to occur that the position of fracture is exactly at escape 31, the junction of valve rod 3 and flashboard 4.

In escape 31, arrange that shape is suitable, size is suitable or width is slightly larger than the stress ring 7 of the degree of depth of escape 31, it is assembled to for convenience in escape 31, stress ring 7 can use clip, but the cooperation tightness degree of clip and escape 31 can be not so good as distensible ring, so stress ring 7 the most preferably has certain elastic distensible ring.

Corrugated tube 5, from the connected mode being arranged on upper and lower corrugated header of prior art, changes to of the present utility model corrugated tube 5 two ends are respectively connecting to flashboard 4 and valve gap 2, for the power that can share part executive component 6 pressure exactly, thus avoid valve rod 3 to rupture.In order to guarantee that more power can be assigned on corrugated tube 5 or can stably power be decomposed on corrugated tube 5, so arranging even power component 8 on stress ring 7.

As in figure 2 it is shown, even power component 8 is elastic component, including a vertical section 81 and two bifurcated sections 82 of the linking of the most Y-shaped structural integrity, vertical section 81 constitutes restrained end with the interconnective one end of bifurcated section 82, and the other end then constitutes free end.Vertically the free end of section 81 is fixing connects stress ring 7, and the free end of two bifurcated sections 82 is fixing connects corrugated tube 5.

Certainly, even power component 8 can be only towards the wherein side setting of valve gap 2 or flashboard 4, only can also only arrange one in certain side, can also be that multiple but uneven distribution is set, but it is able to no matter valve rod 3 is to rise or decline, power can be decomposed above corrugated tube 5, preferred even power component 8 set-up mode of the present embodiment is:

Line centered by stress ring 7, some even power component 8 is distributed, bifurcated section 82 has several towards the even power component 8 of valve gap 2 side, bifurcated section 82 has several towards the even power component 8 of flashboard 4 side, two kinds of differences towards even power component 8 can be varying number, in order to allow the power on valve rod 3 equably, stably be decomposed on corrugated tube 5, preferably equal number and be symmetrically distributed in the both sides of stress ring 7；Additionally, the circumferential direction along stress ring 7 is also evenly arranged with at least two even power component 8.

Claims (5)

1. corrugated tube (5) gate valve, including valve body (1), valve gap (2), valve rod (3), flashboard (4), corrugated tube (5), valve pocket (11) and valve seat (12) it is formed with in valve body (1), valve body (1) and the fixing connection of valve gap (2), valve rod (3) one end and flashboard (4), the other end stretches out valve gap (2) and has been connected executive component (6), the flashboard (4) the oscilaltion formation with valve rod (3) and the closure or openness of valve seat (12), described corrugated tube (5) is enclosed within valve rod (3) outward, it is characterised in that:

Described corrugated tube (5) one end is fixedly installed on flashboard (4), and the other end is fixedly installed on valve gap (2), and the deflection of corrugated tube (5) is more than or equal to the stroke of valve rod (3).

Corrugated tube the most according to claim 1 (5) gate valve, is characterized in that: described valve rod (3) central axis overlaps with corrugated tube (5) central axis.

Corrugated tube the most according to claim 1 (5) gate valve, it is characterized in that: described valve rod (3) is provided with screw thread and is positioned at the escape (31) of thread head, it is welded with the stress ring (7) that shape size is the most suitable in described escape (31), between stress ring (7) and corrugated tube (5), is fixed with even power component (8).

Corrugated tube the most according to claim 3 (5) gate valve, is characterized in that: described even power component (8) is elastic component and is at least symmetrically distributed in two of stress ring (7) axial direction both sides.

5. according to corrugated tube (5) gate valve described in claim 3 or 4, it is characterized in that: described even power component (8) includes the vertical section (81) of Y-shaped structure cohesion and two bifurcated sections (82), vertically the free end of section (81) is fixing connects stress ring (7), and the free end of two bifurcated sections (82) is fixing connects corrugated tube (5).