CN113790305A - Corrugated pipe sealing device - Google Patents

Abstract

The invention discloses a bellows sealing device, comprising: the valve comprises a valve body, a valve assembly, a valve rod, a wave tube assembly, a sealing assembly, a transition tube and a hand wheel. According to the corrugated pipe sealing device, the wave pipe assembly can contract or extend along with the rotation of the valve rod when the valve is opened or closed, and the wave pipe assembly is movably connected with the inner wall of the transition pipe, so that after the wave pipe assembly is driven by the valve rod to rotate and contract, the wave pipe assembly can slowly rotate along with the self elasticity to release the torsional force so as to avoid fatigue damage caused by long-time stress, the sealing assembly arranged at the top of the transition pipe can seal the transition pipe under the condition of water leakage at the joint of the wave pipe assembly and the transition pipe, so that liquid leakage is prevented, the position of the top of the wave pipe assembly can be limited, and the whole wave pipe assembly is prevented from moving upwards under the driving of the valve rod.

Description

Corrugated pipe sealing device

Technical Field

The invention relates to the technical field of valves, in particular to a corrugated pipe sealing device.

Background

The valve of using in the market at present is more and more high to the requirement of leakproofness, but bellows valve has sealed and life's problem always on sealed and the flexible of bellows, thereby in case seal bellows and valve rod then will drive the bellows rotation at the rotatory in-process of valve rod and certainly reduce the life of bellows, if do not carry out sealing connection then can influence the leakproofness in use with the valve rod. Therefore, there is a need for a bellows seal device that at least partially solves the problems of the prior art.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

To at least partially solve the above problems, the present invention provides a bellows seal device including: the valve comprises a valve body, a valve assembly, a valve rod, a wave tube assembly, a sealing assembly, a transition tube and a hand wheel; the transition pipe sets up the top of valve body, seal assembly sets up the top of transition pipe, the valve rod runs through seal assembly extends to inside the valve body, the valve assembly sets up the tip of valve rod is located in the valve body, the hand wheel sets up the top of valve rod, the wave pipe subassembly sets up on the valve rod and with the inner wall swing joint of transition pipe.

Preferably, the valve body comprises a water inlet, a water outlet and a valve opening, the transition pipe is communicated with the valve opening, a partition plate is arranged between the water inlet and the water outlet, a first through hole is formed in the partition plate, and the valve assembly is movably connected with the first through hole.

Preferably, the valve assembly comprises a valve flap and a flap cover; the valve clack sets up the bottom of valve rod, the lamella lid sets up on the lateral wall of valve rod, the valve clack passes through the lamella lid with the valve rod is connected, the valve clack with first through-hole joint.

Preferably, the wave tube assembly comprises an upper disc, a bellows and a lower disc; the upper disc is connected with the lower disc through a corrugated pipe, the upper disc is connected with the inner wall of the top of the transition pipe through a sliding assembly, the top of the upper disc is abutted against the bottom of the sealing assembly, the lower disc is connected with the valve rod, and the valve rod penetrates through the lower disc, the corrugated pipe and the upper disc.

Preferably, the sliding assembly comprises fireproof graphite, a plurality of annular sealing rings and lip-shaped sealing rings; the inner wall of transition pipe is provided with the boss, the boss is located the top of transition pipe, the hanging wall sets up on the boss, fire prevention graphite with ring packing all sets up on the lateral wall of hanging wall, lip seal sets up on the bottom surface of hanging wall and the hanging wall passes through lip seal with boss swing joint.

Preferably, the sealing assembly comprises a filler, a filler pressing sleeve, a filler pressing plate and a sealing cover plate; the sealing cover plate is arranged at the top of the transition pipe, the top of the upper disc is abutted against the bottom of the sealing cover plate, a filling groove is formed in the top surface of the sealing cover plate, the valve rod penetrates through the bottom surface of the filling groove, the filler is arranged in the filling groove, the packing pressing sleeve is arranged on the outer side wall of the valve rod and is inserted into the filling groove, the packing pressing plate is arranged at the top of the packing pressing sleeve, the valve rod penetrates through the packing pressing plate, and the packing pressing plate is connected with the sealing cover plate through a bolt.

Preferably, a valve cover is arranged at the top of the sealing cover plate, and the valve rod penetrates through the valve cover to be connected with the hand wheel.

Preferably, an oil cup is arranged on the valve cover, and the oil cup is communicated with the joint of the valve cover and the valve rod.

Preferably, the corrugated pipe is a spiral corrugation, and an elastic piece is spirally arranged in the corrugation; be provided with the reference column that a plurality of set up along the axial on the inner wall of bellows, the lateral wall of reference column with the valve rod butt, bellows rotation compression back, adjacent two the top surface and the bottom surface butt and a plurality of reference column lie in same center axis behind the reference column butt.

Preferably, be provided with the mounting groove on the valve clack, the valve clack pass through anti-overflow device with the valve rod is connected, anti-overflow device is located the below of flap lid and be located in the mounting groove, anti-overflow device includes: an inner solenoid, an outer solenoid and a sleeve; the inner spiral pipe is arranged in the mounting groove, the outer spiral pipe is in threaded connection with the inner spiral pipe, the sleeve is arranged in the outer spiral pipe, the bottom of the outer spiral pipe is connected with the bottom surface of the mounting groove through a fixing part, the valve rod penetrates through the sleeve and is connected with the fixing part, the sleeve is in a reverse taper shape with a large upper end and a small lower end, the diameter of the upper end of the sleeve is larger than that of the upper end of the outer spiral pipe, a plurality of movable grooves are formed in the side wall of the sleeve, openings of the movable grooves are respectively located at the upper end and the lower end of the sleeve and are alternately arranged, a pressing block is arranged on the outer side wall of the inner spiral pipe and is movably connected with the mounting groove, a limiting groove is formed in the outer side wall of the sleeve, a first clamping ring is arranged at the upper end of the inner spiral pipe inner wall and is matched with the limiting groove, and a second clamping ring is arranged at the lower end of the outer side wall of the sleeve, the second snap ring with the inner wall swing joint of outer solenoid, the inner wall of outer solenoid is provided with the third snap ring, the top surface of third snap ring with the bottom surface butt of second snap ring.

Compared with the prior art, the invention at least comprises the following beneficial effects:

1. according to the corrugated pipe sealing device, the wave pipe assembly can contract or extend along with the rotation of the valve rod when the valve is opened or closed, and the wave pipe assembly is movably connected with the inner wall of the transition pipe, so that after the wave pipe assembly is driven by the valve rod to rotate and contract, the wave pipe assembly can slowly rotate along with the self elasticity to release the torsional force so as to avoid fatigue damage caused by long-time stress, the sealing assembly arranged at the top of the transition pipe can seal the transition pipe under the condition of water leakage at the joint of the wave pipe assembly and the transition pipe, so that liquid leakage is prevented, the position of the top of the wave pipe assembly can be limited, and the whole wave pipe assembly is prevented from moving upwards under the driving of the valve rod.

Other advantages, objects, and features of the bellows seal arrangement of the present invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a cross-sectional view of a bellows seal arrangement according to the present invention.

Fig. 2 is a schematic structural diagram of a bellows assembly in the bellows seal device according to the present invention.

Fig. 3 is a cross-sectional view of the bellows seal at the upper disk of the present invention.

FIG. 4 is a cross-sectional view of the bellows seal of the present invention at the upper disc.

Fig. 5 is a cross-sectional view of a bellows in the bellows seal device according to the present invention.

Fig. 6 is a cross-sectional view taken at a in fig. 5.

Fig. 7 is a sectional view taken along the direction B in fig. 5.

Fig. 8 is a schematic structural view of an anti-overflow device in the bellows seal device according to the present invention.

Fig. 9 is a schematic structural view of an outer coil in the bellows sealing device according to the present invention.

Fig. 10 is a schematic structural view of a sleeve in the bellows seal device according to the present invention.

Fig. 11 is a cross-sectional view of a spill guard in a bellows seal arrangement according to the present invention.

In the figure: 1 valve body, 2 valve rods, 3 transition pipes, 4 handwheels, 5 clapboards, 6 valve clacks, 7 flap covers, 8 upper plates, 9 corrugated pipes, 10 lower plates, 11 fireproof graphite, 12 annular sealing rings, 13 lip-shaped sealing rings, 14 fillers, 15 packing pressing sleeves, 16 packing pressing plates, 17 sealing cover plates, 18 valve covers, 19 oil cups, 20 elastic parts, 21 positioning columns, 22 inner screwed pipes, 23 outer screwed pipes, 24 sleeves, 25 fixing parts, 26 movable grooves, 27 pressing blocks, 28 limiting grooves, 29 first clamping rings, 30 second clamping rings and 31 third clamping rings.

Detailed Description

The present invention is further described in detail below with reference to the drawings and examples so that those skilled in the art can practice the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

As shown in fig. 1 to 11, the present invention provides a bellows seal device including: the valve comprises a valve body 1, a valve assembly, a valve rod 2, a wave tube assembly, a sealing assembly, a transition tube 3 and a hand wheel 4; transition pipe 3 sets up the top of valve body 1, sealing assembly sets up the top of transition pipe 3, valve rod 2 runs through sealing assembly extends to inside the valve body 1, the valve assembly sets up the tip of valve rod 2 is located in the valve body 1, hand wheel 4 sets up the top of valve rod 2, the wave tube subassembly sets up on the valve rod 2 and with the inner wall swing joint of transition pipe 3.

The working principle of the technical scheme is as follows: sealing assembly seals the top of transition pipe 3, the wave tube subassembly is driven by valve rod 2 when 3 internal rotation shrink of transition pipe, sealing assembly can also prevent the liquid seepage simultaneously to the wave tube subassembly plays spacing effect, when opening the valve, thereby rotate hand wheel 4 and drive valve rod 2 and rotate and rise, thereby valve rod 2 takes the valve component to shift up and make valve body 1 be in the state of opening, thereby the liquid of flow can be blockked by the wave tube subassembly in the valve and prevent that liquid from leaking from valve rod 2, when closing the valve, the reverse rotation hand wheel 4 makes valve rod 2 move down thereby make the valve component cut off valve body 1 and close the valve.

The beneficial effects of the above technical scheme are that: through the design of above-mentioned structure, the wave tube subassembly can be along with the rotatory shrink of valve rod 2 or extend when the valve is opened or is closed, and because the inner wall of wave tube subassembly and transition pipe 3 is swing joint, so after the wave tube subassembly is driven rotatory shrink by valve rod 2, thereby can release torsional strength along with the rotation that self elasticity can be slow and avoid being in the stress condition for a long time and cause fatigue damage, the sealing assembly who sets up at transition pipe 3 top both can seal transition pipe 3 under the circumstances that the junction of wave tube subassembly and transition pipe 3 leaked, thereby prevent liquid leakage, also can carry out the position to the top of wave tube subassembly and prescribe a limit, avoid the whole also following of wave tube subassembly under the drive of valve rod 2 and move up.

In one embodiment, the valve body 1 comprises a water inlet, a water outlet and a valve opening, and the transition pipe 3 is communicated with the valve opening. A partition plate 5 is arranged between the water inlet and the water outlet, a first through hole is formed in the partition plate 5, and the valve assembly is movably connected with the first through hole.

The working principle and the beneficial effects of the technical scheme are as follows: through the design of above-mentioned structure, valve body 1 separates water inlet and delivery port through baffle 5 to can realize the water route intercommunication between water inlet and the delivery port and close through the cooperation of first through-hole and valve member, valve mouth and delivery port setting are in the homonymy of baffle 5, thereby make and just can not have liquid to last to exert pressure to seal assembly and the ripples subassembly at transition pipe 3 tops after the valve member blocks up first through-hole, thereby increased seal assembly and the life of ripples subassembly.

In one embodiment, the valve assembly comprises a valve flap 6 and a flap cover 7; valve clack 6 sets up the bottom of valve rod 2, flap lid 7 sets up on the lateral wall of valve rod 2, valve clack 6 passes through flap lid 7 with valve rod 2 is connected, valve clack 6 with first through-hole joint.

The working principle and the beneficial effects of the technical scheme are as follows: through the design of above-mentioned structure, valve clack 6 can be stifled with first through-hole, and the diameter more than or equal to diameter of valve clack 6 first through-hole to make can impress valve clack 6 first through-hole when valve rod 2 moves down, and then realize closing of valve, flap lid 7 can support to prevent that it from droing to the fixed support that provides of installation of valve clack 6.

In one embodiment, the wave tube assembly comprises an upper disc 8, a bellows 9, and a lower disc 10; the upper disc 8 is connected with the lower disc 10 through a corrugated pipe 9, the upper disc 8 is connected with the inner wall of the top of the transition pipe 3 through a sliding assembly, the top of the upper disc 8 is abutted against the bottom of the sealing assembly, the lower disc 10 is connected with the valve rod 2, and the valve rod 2 penetrates through the lower disc 10, the corrugated pipe 9 and the upper disc 8.

The working principle of the technical scheme is as follows: the upper disc 8, the corrugated pipe 9 and the lower disc 10 form a whole and are arranged in the transition pipe 3, the lower disc 10 is connected and sealed with the valve rod 2 so as to prevent liquid from leaking from the joint of the lower disc 10 and the valve rod 2, the side wall of the upper disc 8 is connected with the inner wall of the transition pipe 3 through a sliding assembly so as to ensure that the upper disc 8 and the transition pipe 3 can rotate, the liquid can also be prevented from leaking from the joint of the upper disc 8 and the transition pipe 3, the bottom of the transition pipe 3 is connected with a valve opening in a sealing manner so as to prevent the liquid from leaking from the joint of the transition pipe 3 and the valve opening, the top of the upper disc 8 is abutted against the bottom of the sealing assembly so as to limit the position of the upper disc 8 and avoid the displacement of the upper disc 8, and the sealing assembly can also prevent the leaked liquid from leaking from the joint of the valve rod 2 and the upper disc 8 and the joint of the transition pipe 3 for the second time, when the valve rod 2 is opened or closed, the valve rod 2 can drive the lower disc 10 to rotate in the transition pipe 3 and move up and down, so that the corrugated pipe 9 is twisted and compressed, and after the corrugated pipe 9 reaches a limit position, the upper disc 8 can be driven to slowly rotate under the action of self elasticity, so that the torsion is released.

The beneficial effects of the above technical scheme are that: through the design of above-mentioned structure, transition pipe 3 and valve opening, go up dish 8 and transition pipe 3, lower wall 10 and valve rod 2, go up dish 8 and bellows 9, bellows 9 and lower wall 10 have all carried out sealing treatment thereby guarantee that the valve can not appear liquid leakage at the in-process that uses, in order to guarantee the normal rotation and the displacement of hanging dish 8, need realize sealedly through sliding assembly between transition pipe 3 and the hanging dish 8, thereby it is rotatory and lead to bellows 9 to damage under the tensile of long-term high frequency and the torsional condition to avoid hanging dish 8 can't be driven by bellows 9, and then the condition that leads to liquid to follow valve rod 2 and the junction secondary leakage of hanging dish 8 appears.

In one embodiment, the sliding assembly comprises fire-resistant graphite 11, a plurality of annular sealing rings 12 and lip sealing rings 13; the inner wall of transition pipe 3 is provided with the boss, the boss is located the top of transition pipe 3, it sets up to go up the wall 8 on the boss, fire prevention graphite 11 with ring packing 12 all sets up on the lateral wall of wall 8, lip seal 13 sets up on the bottom surface of wall 8 and go up the wall 8 pass through lip seal 13 with boss swing joint.

The working principle of the technical scheme is as follows: lip seal 13 includes upper lip ring and lower lip ring, upper lip ring and lower lip ring joint and can the relative slip, bellows 9 is twisted reverse after the compression, can drive hanging wall 8 and rotate under the effect of elastic force, the bottom surface of hanging wall 8 can drive the upper lip ring of being connected rather than rotate, lower lip ring receives gravity and the effect of hanging wall 8's pressure can not follow upper lip ring and rotate together, alright relative rotation and the sealing with lower lip ring in order to guarantee from this, annular seal 12 and fire prevention graphite 11 all can keep sealed under the condition of taking place to slide with the lateral wall of hanging wall 8 simultaneously.

The beneficial effects of the above technical scheme are that: through the design of above-mentioned structure, lip seal 13 can not influence the rotation of hanging wall 8 under the sealed circumstances of assurance, and when lip seal 13 took place to damage or reveal, fire prevention graphite 11 and ring seal 12 can play the sealed effect of protecting of second floor to lip seal 13 sets up the life that can avoid hanging wall 8 and the friction between the boss and then increase hanging wall 8 in the bottom surface of hanging wall 8.

In one embodiment, the seal assembly includes a packing 14, a packing gland 15, a packing press plate 16, and a seal cover plate 17; the sealing cover plate 17 is arranged on the top of the transition pipe 3, the top of the upper disc 8 is abutted with the bottom of the sealing cover plate 17, the top surface of the sealing cover plate 17 is provided with a filling groove, the valve rod 2 penetrates through the bottom surface of the filling groove, the filler 14 is arranged in the filling groove, the packing pressing sleeve 15 is arranged on the outer side wall of the valve rod 2 and is inserted into the filling groove, the packing press plate 16 is disposed on top of the packing press sleeve 15 and the valve stem 2 extends through the packing press plate 16, the packing press plate 16 is connected with the sealing cover plate 17 through bolts, a valve cover 18 is arranged on the top of the sealing cover plate 17, the valve rod 2 penetrates through the valve cover 18 to be connected with the hand wheel 4, an oil cup 19 is arranged on the valve cover 18, and the oil cup 19 is communicated with the joint of the valve cover 18 and the valve rod 2.

The working principle of the technical scheme is as follows: when sealing is carried out between the sealing cover plate 17 and the valve rod 2, the filling groove needs to be filled with fillers 14, the fillers 14 can be made of wear-resistant materials, then the filling pressing sleeve 15 is pressed into the filling groove through the filling pressing plate 16, the fillers 14 in the filling groove are compacted, so that the sealing effect is ensured, the relative distance between the filling pressing plate 16 and a bolt at the top of the sealing cover plate 17 can be adjusted, so that the compaction force of the filling pressing sleeve 15 on the fillers 14 is adjusted, the valve cover 18 can provide support for installation of the hand wheel 4, the hand wheel 4 is connected with the valve cover 18 through a shaft, the hand wheel 4 can drive the valve rod 2 to move when rotating, so that the valve is controlled to be opened and closed, and the side wall of the valve cover 18 is also provided with an oil cup 19 for filling oil into the hand wheel 4.

The beneficial effects of the above technical scheme are that: through the design of above-mentioned structure, filler 14 in the filling tank can be changed regularly as required and avoid filler 14 live time to appear sealed untight and phenomenon such as filler 14 ageing for a long time, the degree of compaction of filler 14 can be adjusted in the cooperation between packing pressure sleeve 15 and the packing clamp plate 16, and through the resistance size when degree of compaction adjustment valve rod 2 moves for filler 14, and then the rotation dynamics of adjustment hand wheel 4, valve gap 18 can provide support for the installation of hand wheel 4 and can also carry out the oiling to the junction of valve rod 2 and valve gap 18 through the oil cup 19 on it simultaneously, prevent that the shaft connecting part from drying and puckering.

In one embodiment, the bellows 9 is a helical bellows, the inside of which is spirally provided with an elastic member 20; be provided with the reference column 21 that a plurality of set up along the axial on the inner wall of bellows 9, the lateral wall of reference column 21 with 2 butts of valve rod, bellows 9 rotatory compression back, adjacent two the top surface and the bottom surface butt and the a plurality of reference column 21 are located same center axis behind the butt.

The working principle of the technical scheme is as follows: when the valve rod 2 rotates, the bellows 9 on the valve rod rotates together, because a sliding assembly is arranged between the upper disc 8 and the transition pipe 3, the rotating speed of the upper disc 8 is far less than the rotating speed of the bellows 9, so that the spiral elastic member 20 inside the bellows 9 can be twisted, the bellows 9 can be contracted along with the movement of the valve rod 2 in the twisting process until the bellows 9 is twisted to the limit position, the positioning columns 21 inside the bellows 9 can be abutted with each other, the damage of the elastic member 20 caused by the continuous twisting of the bellows 9 is avoided, the valve rod 2 can not rotate continuously when the bellows 9 can not rotate continuously, so that an operator knows that the valve reaches the limit of rotation, after the valve is opened, the upper disc 8 can slide and rotate relative to the transition pipe 3 under the effect of the torsion of the elastic member 20 until the torsion of the elastic member 20 is completely released by the upper disc 8, the same applies when the valve is closed.

The beneficial effects of the above technical scheme are that: through the design of above-mentioned structure, reference column 21 can twist reverse the spacing effect of playing to the limit in bellows 9, prevents that elastic component 20 from damaging, and reference column 21 installs in the inside of bellows 9 simultaneously, can prevent that bellows 9 from being after the shrink, by extrusion, friction such as elastic component 20 in valve rod 2 and the bellows 9, has increased accommodation space between valve rod 2 and bellows 9 to bellows 9's life has been increased.

In one embodiment, a mounting groove is provided on the valve flap 6, the valve flap 6 is connected with the valve rod 2 through an anti-overflow device, the anti-overflow device is located below the flap cover 7 and in the mounting groove, and the anti-overflow device comprises: an inner solenoid 22, an outer solenoid 23 and a sleeve 24; the inner solenoid 22 is arranged in the mounting groove, the outer solenoid 23 is in threaded connection with the inner solenoid 22, the sleeve 24 is arranged in the outer solenoid 23, the bottom of the outer solenoid 23 is connected with the bottom surface of the mounting groove through a fixing part 25, the valve rod 2 penetrates through the sleeve 24 and is connected with the fixing part 25, the sleeve 24 is in a reverse taper shape with a large upper end and a small lower end, the diameter of the upper end of the sleeve 24 is larger than that of the upper end of the outer solenoid 23, a plurality of movable grooves 26 are arranged on the side wall of the sleeve 24, openings of the movable grooves 26 are respectively arranged at the upper end and the lower end of the sleeve 24 and are alternately arranged, a pressing block 27 is arranged on the outer side wall of the inner solenoid 22, the pressing block 27 is movably connected with the mounting groove, a limiting groove 28 is arranged on the outer side wall of the sleeve 24, and a first clamping ring 29 is arranged at the upper end of the inner solenoid 22, first snap ring 29 with spacing groove 28 suits, the lower extreme of sleeve pipe 24 lateral wall is provided with second snap ring 30, second snap ring 30 with outer solenoid 23's inner wall swing joint, outer solenoid 23's inner wall is provided with third snap ring 31, the top surface of third snap ring 31 with the bottom surface butt of second snap ring 30.

The working principle of the technical scheme is as follows: when the valve clack 6 is pressed on the first through hole, the first through hole can provide pressure and friction force for the valve clack 6 to enable the valve clack 6 not to rotate together with the valve rod 2, at the moment, the valve rod 2 can drive the outer solenoid 23 to rotate continuously through the fixing piece 25 if rotating continuously, and the inner solenoid 22 cannot rotate continuously under the action force of the valve clack 6, so that the inner solenoid 22 can displace downwards when the outer solenoid 23 rotates, a speed difference can be formed between the inner solenoid 22 and the valve rod 2 because the thread pitch of the threaded connection between the outer solenoid 23 and the inner solenoid 22 is small, the moving speed of the inner solenoid 22 is larger than that of the valve rod 2, the inner solenoid 22 can press the pressing block 27 downwards into the mounting groove of the valve clack 6, the pressing block 27 enables the inner solenoid 22 to deform under the action of the valve clack 6, and further enables the first clamping ring 29 on the pressing block to be clamped into the limiting groove 28, and the sleeve 24 is in a reverse taper shape with a large upper part and a small part, after being extruded by the first snap ring 29, the sleeve 24 deforms and extrudes the valve rod 2, so that the valve rod 2 stops rotating under large resistance, an operator knows that the valve is closed tightly, and then the valve rod 4 can rotate reversely to prevent locking, when the valve is opened, if the operator forgets the rotating direction of the valve rod 4 during opening, the operator can find errors even if the direction of the valve rod 4 is wrong due to sudden locking of the valve 2.

The beneficial effects of the above technical scheme are that: through the design of above-mentioned structure, the pitch between interior screwed pipe 22 and the outer screwed pipe 23 is less, make interior screwed pipe 22 can and the valve rod 2 between form the speed difference, thereby can realize anti-overflow device's quick response, the in-process that moves down including screwed pipe 22 also can be relative drives valve clack 6 and moves down, thereby make the valve clack 6 and the dynamics of being connected between the first through-hole strengthen, and then increase the effort of valve clack 6 to interior screwed pipe 22, can make anti-overflow device reset after the valve closes tightly at the reversal once, thereby when opening the valve, even if the direction rotation mistake of hand wheel 4, anti-overflow device can in time be in time with valve rod 2 locking warning operating personnel, prevent to appear because the condition that valve clack 6 runs through first through-hole and lead to the valve damage appears in the maloperation.

In one embodiment, in order to seal the valve stem 2 with the packing 14 when the packing pressing sleeve 15 presses the packing 14, the lowest compression height H of the packing 14 needs to be calculated by the following formula

H＝10(C+KP)²/Q²

Wherein H is the minimum contact height of the packing 14 with the valve stem 2 after compression; c is the material coefficient of the valve stem 2, typically steel and cemented carbide C is 3.5, and rubber C is 0.4; k is the coefficient of influence of the medium pressure on the pressure value of the material of the valve rod 2, typically steel and cemented carbide K is 1 and rubber K is 0.6; p is the pressure of the filler 14 against the valve stem 2; q is a specific seal pressure value of filler 14 in a liquid normal temperature state.

The working principle and the beneficial effects of the technical scheme are as follows: the minimum contact height of the compressed filler 14 and the valve rod 2 is calculated through the formula, the sealing performance between the filler 14 and the valve rod 2 can be ensured as long as the height is ensured to be larger than H, so that the secondary leakage of liquid is avoided, and if the height of the filler 14 is smaller than H, the secondary leakage can be caused by seepage from a gap between the filler 14 and the valve rod 2 under the action of liquid pressure.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

While embodiments of the invention have been disclosed above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.

Claims (10)

1. A bellows seal, comprising: the valve comprises a valve body (1), a valve assembly, a valve rod (2), a wave tube assembly, a sealing assembly, a transition tube (3) and a hand wheel (4); transition pipe (3) set up the top of valve body (1), sealing assembly sets up the top of transition pipe (3), valve rod (2) run through sealing assembly extends to inside valve body (1), the valve assembly sets up the tip of valve rod (2) is located in valve body (1), hand wheel (4) set up the top of valve rod (2), the wave pipe subassembly sets up on valve rod (2) and with the inner wall swing joint of transition pipe (3).

2. The bellows seal device according to claim 1, wherein the valve body (1) comprises a water inlet, a water outlet and a valve opening, the transition pipe (3) is communicated with the valve opening, a partition (5) is arranged between the water inlet and the water outlet, a first through hole is arranged on the partition (5), and the valve assembly is movably connected with the first through hole.

3. Bellows seal according to claim 2, wherein the valve assembly comprises a flap (6) and a flap cover (7); valve clack (6) set up the bottom of valve rod (2), lamella lid (7) set up on the lateral wall of valve rod (2), valve clack (6) pass through lamella lid (7) with valve rod (2) are connected, valve clack (6) with first through-hole joint.

4. The bellows seal arrangement of claim 1, wherein the wave tube assembly comprises an upper disc (8), a bellows (9) and a lower disc (10); the upper disc (8) is connected with the lower disc (10) through a corrugated pipe (9), the upper disc (8) is connected with the inner wall of the top of the transition pipe (3) through a sliding assembly, the top of the upper disc (8) is abutted to the bottom of the sealing assembly, the lower disc (10) is connected with the valve rod (2), and the valve rod (2) penetrates through the lower disc (10), the corrugated pipe (9) and the upper disc (8).

5. Bellows seal according to claim 4, wherein the sliding assembly comprises a fire-resistant graphite (11), a number of ring seals (12) and a lip seal (13); the inner wall of transition pipe (3) is provided with the boss, the boss is located the top of transition pipe (3), hanging wall (8) set up on the boss, fire prevention graphite (11) with ring packing (12) all set up on the lateral wall of hanging wall (8), lip sealing (13) set up on the bottom surface of hanging wall (8) and hanging wall (8) pass through lip sealing (13) with boss swing joint.

6. The bellows seal arrangement of claim 4, wherein the seal assembly comprises a packing (14), a packing gland (15), a packing press plate (16) and a seal cover plate (17); the sealing cover plate (17) is arranged at the top of the transition pipe (3), the top of the upper disc (8) is abutted to the bottom of the sealing cover plate (17), a filling groove is formed in the top surface of the sealing cover plate (17), the valve rod (2) penetrates through the bottom surface of the filling groove, the filler (14) is arranged in the filling groove, the packing pressing sleeve (15) is arranged on the outer side wall of the valve rod (2) and inserted into the filling groove, the packing pressing plate (16) is arranged at the top of the packing pressing sleeve (15) and penetrates through the packing pressing plate (16) of the valve rod (2), and the packing pressing plate (16) is connected with the sealing cover plate (17) through bolts.

7. The bellows seal arrangement according to claim 6, characterized in that a valve cover (18) is arranged on top of the sealing cover plate (17), the valve stem (2) being connected to the hand wheel (4) through the valve cover (18).

8. The bellows seal arrangement according to claim 7, wherein an oil cup (19) is arranged on the valve cover (18), the oil cup (19) communicating with the connection of the valve cover (18) and the valve stem (2).

9. Bellows seal according to claim 4, wherein the bellows (9) is helically corrugated, the corrugation being internally helically provided with a resilient member (20); be provided with reference column (21) that a plurality of set up along the axial on the inner wall of bellows (9), the lateral wall of reference column (21) with valve rod (2) butt, bellows (9) rotatory compression back, adjacent two the top surface and the bottom surface butt and a plurality of reference column (21) lie in same center axis behind reference column (21) butt.

10. The bellows seal arrangement according to claim 3, wherein a mounting groove is provided on the valve flap (6), the valve flap (6) being connected to the valve stem (2) by an overfill prevention device, the overfill prevention device being located below the flap cover (7) and within the mounting groove, the overfill prevention device comprising: an inner screw tube (22), an outer screw tube (23) and a sleeve (24); the inner solenoid (22) is arranged in the mounting groove, the outer solenoid (23) is in threaded connection with the inner solenoid (22), the sleeve (24) is arranged in the outer solenoid (23), the bottom of the outer solenoid (23) is connected with the bottom surface of the mounting groove through a fixing piece (25), the valve rod (2) penetrates through the sleeve (24) and is connected with the fixing piece (25), the sleeve (24) is in an inverted cone shape with a large upper end and a small lower end, the diameter of the upper end of the sleeve (24) is larger than that of the upper end of the outer solenoid (23), the side wall of the sleeve (24) is provided with a plurality of movable grooves (26), openings of the movable grooves (26) are respectively located at the upper end and the lower end of the sleeve (24) and are alternately arranged, the outer side wall of the inner solenoid (22) is provided with a pressing block (27), and the pressing block (27) is movably connected with the mounting groove, be equipped with spacing groove (28) on the lateral wall of sleeve pipe (24), the upper end of interior solenoid (22) inner wall is provided with first snap ring (29), first snap ring (29) with spacing groove (28) suit, the lower extreme of sleeve pipe (24) lateral wall is provided with second snap ring (30), second snap ring (30) with the inner wall swing joint of outer solenoid (23), the inner wall of outer solenoid (23) is provided with third snap ring (31), the top surface of third snap ring (31) with the bottom surface butt of second snap ring (30).

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