CN113790305B

CN113790305B - Bellows sealing device

Info

Publication number: CN113790305B
Application number: CN202111134699.7A
Authority: CN
Inventors: 朱转; 姚建均; 王茁; 史可任; 季会剑; 童海东; 唐玉松
Original assignee: Jiangsu Shengtai Valve Co ltd
Current assignee: Jiangsu Shengtai Valve Co ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2023-08-04
Anticipated expiration: 2041-09-27
Also published as: CN113790305A

Abstract

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

Description

Bellows sealing device

Technical Field

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

Background

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

Disclosure of Invention

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the invention is not intended to define the key features and 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 apparatus 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; 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 and extends to inside the valve body, the valve assembly sets up the tip of valve rod and be located in the valve body, the hand wheel sets up the top of valve rod, the ripples nest of tubes subassembly set 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 is arranged at the bottom of the valve rod, the valve clack cover is arranged on the side wall of the valve rod, the valve clack is connected with the valve rod through the valve clack cover, and the valve clack is clamped with the first through hole.

Preferably, the wave tube assembly comprises an upper disc, a wave tube 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 in butt joint with 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 component comprises fireproof graphite, a plurality of annular sealing rings and lip-shaped sealing rings; the inner wall of the transition pipe is provided with a boss, the boss is located at the top of the transition pipe, the upper disc is arranged on the boss, fireproof graphite and the annular sealing ring are arranged on the side wall of the upper disc, the lip sealing ring is arranged on the bottom surface of the upper disc, and the upper disc is movably connected with the boss through the lip sealing ring.

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 in butt joint with 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, filler is arranged in the filling groove, the filler pressing sleeve is arranged on the outer side wall of the valve rod and is inserted into the filling groove, the filler pressing plate is arranged at the top of the filler pressing sleeve, the valve rod penetrates through the filler pressing plate, and the filler pressing plate is connected with the sealing cover plate through bolts.

Preferably, a valve cover is arranged at the top of the sealing cover plate, and the valve rod penetrates through the valve cover and is 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 spiral corrugated, and elastic pieces are spirally arranged in the corrugated pipe; the corrugated pipe is characterized in that a plurality of positioning columns arranged along the axial direction are arranged on the inner wall of the corrugated pipe, the side walls of the positioning columns are abutted to the valve rod, after the corrugated pipe is rotationally compressed, the top surfaces and the bottom surfaces of the adjacent two positioning columns are abutted to each other, and a plurality of positioning columns are abutted to each other and then located on the same central axis.

Preferably, the valve clack is provided with a mounting groove, the valve clack is connected with the valve rod through an anti-overflow device, the anti-overflow device is located below the valve cover and in the mounting groove, and the anti-overflow device comprises: an inner coil, an outer coil and a sleeve; the inner screw tube is arranged in the mounting groove, the outer screw tube is in threaded connection with the inner screw tube, the sleeve is arranged in the outer screw tube, the bottom of the outer screw tube is connected with the bottom surface of the mounting groove through a fixing piece, the valve rod penetrates through the sleeve and is connected with the fixing piece, the sleeve is in an inverted cone shape with a big top and a small bottom, the diameter of the upper end of the sleeve is larger than that of the upper end of the outer screw tube, a plurality of movable grooves are formed in the side wall of the sleeve, openings of the movable grooves are respectively arranged 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 screw tube, the pressing block 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 wall of the inner screw tube, a second clamping ring is arranged at the lower end of the outer side wall of the sleeve and is in movable connection with the inner wall of the outer screw tube, and a third clamping ring is abutted to the bottom surface of the third clamping ring.

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

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

Additional advantages, objects, and features of the 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 are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:

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

Fig. 2 is a schematic structural view 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 of the present invention at the upper plate.

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

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

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

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

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

Fig. 9 is a schematic structural view of an outer coil in the bellows seal apparatus 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 an anti-overflow device in a bellows seal according to the present invention.

In the figure: the valve comprises a valve body 1, a valve rod 2, a transition pipe 3, a hand wheel 4, a partition plate 5, a valve clack 6, a valve cover 7, a valve disc 8, a corrugated pipe 9, a valve disc 10, fireproof graphite 11, an annular sealing ring 12, a lip sealing ring 13, a filler 14, a filler pressing sleeve 15, a filler pressing plate 16, a sealing cover plate 17, a valve cover 18, an oil cup 19, an elastic piece 20, a positioning column 21, an inner screw pipe 22, an outer screw pipe 23, a sleeve 24, a fixing piece 25, a movable groove 26, a pressing block 27, a limiting groove 28, a first clamping ring 29, a second clamping ring 30 and a third clamping ring 31.

Detailed Description

The present invention is described in further detail below with reference to the drawings and examples to enable those skilled in the art to practice the invention by referring 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 apparatus 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; the transition pipe 3 is arranged at the top of the valve body 1, the sealing assembly is arranged at the top of the transition pipe 3, the valve rod 2 penetrates through the sealing assembly and extends to the inside of the valve body 1, the valve assembly is arranged at the end part of the valve rod 2 and is positioned in the valve body 1, the hand wheel 4 is arranged at the top end of the valve rod 2, and the wave tube assembly is arranged on the valve rod 2 and is movably connected with the inner wall of the transition pipe 3.

The working principle of the technical scheme is as follows: when the valve is opened, the hand wheel 4 is rotated to drive the valve rod 2 to move upwards so that the valve body 1 is in an opened state, liquid flowing in the valve can be blocked by the wave tube assembly to prevent liquid from leaking from the valve rod 2, and when the valve is closed, the hand wheel 4 is reversely rotated to enable the valve rod 2 to move downwards so that the valve assembly cuts off the valve body 1 to close the valve.

The beneficial effects of the technical scheme are that: through the design of above-mentioned structure, the ripples pipe assembly can be along with valve rod 2 rotatory shrink or extension when the valve is opened or closed to because the inner wall of ripples pipe assembly and transition pipe 3 is swing joint, so after ripples pipe assembly is driven rotatory shrink by valve rod 2, can slowly rotate along with self elasticity and release the strength of torsion and cause fatigue damage with the state of being in for a long time, the sealing component who sets up at transition pipe 3 top both can seal transition pipe 3 under the junction of ripples pipe assembly and transition pipe 3 water leakage's condition, thereby prevent that liquid from leaking, also can carry out the position to the top of ripples pipe assembly and prescribe a limit to, avoid that the ripples pipe assembly is whole also to follow up under the drive of valve rod 2.

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 board 5 is arranged between the water inlet and the water outlet, a first through hole is formed in the partition board 5, and the valve component is movably connected with the first through hole.

The technical scheme has the working principle and beneficial effects that: through the design of above-mentioned structure, valve body 1 separates water inlet and delivery port through baffle 5 to can realize water route intercommunication and closing between water inlet and the delivery port through the cooperation of first through-hole and valve subassembly, valve opening and delivery port set up the homonymy at baffle 5, thereby make just can not have liquid to last to exert pressure to sealing component and the ripples pipe assembly at transition pipe 3 top after valve subassembly blocks up first through-hole, thereby increased sealing component and ripples pipe assembly's life.

In one embodiment, the valve assembly comprises a valve flap 6 and a valve flap cover 7; the valve clack 6 is arranged at the bottom of the valve rod 2, the valve clack cover 7 is arranged on the side wall of the valve rod 2, the valve clack 6 is connected with the valve rod 2 through the valve clack cover 7, and the valve clack 6 is clamped with the first through hole.

The technical scheme has the working principle and beneficial effects that: through the design of above-mentioned structure, valve clack 6 can be with first through-hole shutoff, and the diameter of valve clack 6 is greater than or equal to the diameter of first through-hole to can impress valve clack 6 first through-hole when valve rod 2 moves down, and then realize closing of valve, valve cover 7 can provide the support to the installation of valve clack 6 and prevent that it from droing.

In one embodiment, the bellows 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 top inner wall of the transition pipe 3 through a sliding component, the top of the upper disc 8 is in butt joint with the bottom of the sealing component, 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 and the valve rod 2 are connected and sealed, liquid is prevented 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 the sliding component, so that the upper disc 8 and the transition pipe 3 can be guaranteed to rotate, liquid can 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 in sealing connection with the valve opening, liquid is prevented from leaking from the joint of the transition pipe 3 and the valve opening, the top of the upper disc 8 is abutted to the bottom of the sealing component, the upper disc 8 can be prevented from being displaced by the sealing component, meanwhile, the sealing component can also prevent the leaked liquid from leaking from the joint of the valve rod 2 and the upper disc 8 and the transition pipe 3, 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, the corrugated pipe 9 is further twisted and compressed, and after the valve rod 9 reaches the limit position, the top of the valve opening is driven by the sealing component, and the torque force of the upper disc 8 can be released slowly.

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

In one embodiment, the sliding assembly comprises fireproof graphite 11, a plurality of annular sealing rings 12 and a lip sealing ring 13; the inner wall of the transition pipe 3 is provided with a boss, the boss is located at the top of the transition pipe 3, the upper disc 8 is arranged on the boss, the fireproof graphite 11 and the annular sealing ring 12 are both arranged on the side wall of the upper disc 8, the lip sealing ring 13 is arranged on the bottom surface of the upper disc 8, and the upper disc 8 is movably connected with the boss through the lip sealing ring 13.

The working principle of the technical scheme is as follows: the lip seal ring 13 comprises an upper lip ring and a lower lip ring, the upper lip ring is clamped with the lower lip ring and can slide relatively, after the corrugated pipe 9 is twisted and compressed, the upper disc 8 can be driven to rotate under the action of elastic force, the bottom surface of the upper disc 8 can drive the upper lip ring connected with the upper disc to rotate, the lower lip ring is acted by gravity and the pressure of the upper disc 8 and can not rotate along with the upper lip ring, therefore, the relative rotation and sealing of the upper lip ring and the lower lip ring can be ensured, and simultaneously, the annular seal ring 12 and the fireproof graphite 11 can be kept sealed under the condition of sliding with the side wall of the upper disc 8.

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

In one embodiment, the seal assembly includes a packing 14, a packing press sleeve 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, the valve rod 2 penetrates through the packing pressing plate 16, the packing pressing plate 16 is connected with the sealing cover plate 17 through bolts, a valve cover 18 is arranged at the top of the sealing cover plate 17, the valve rod 2 penetrates through the valve cover 18 and is connected with the hand wheel 4, and an oil cup 19 is arranged on the valve cover 18 and 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: the packing cover plate 17 and the valve rod 2 are sealed, the packing 14 is required to be filled in the packing groove, the packing 14 can be made of wear-resistant materials, then the packing pressing sleeve 15 is pressed into the packing groove through the packing pressing plate 16, the packing 14 in the packing groove is compacted, the sealing effect is ensured, the packing pressing plate 16 can adjust the relative distance between the packing pressing sleeve and the bolt at the top of the sealing cover plate 17, the compacting force of the packing pressing sleeve 15 on the packing 14 is adjusted, the valve cover 18 can provide support for mounting 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 opening and the closing of the valve are controlled, and the side wall of the valve cover 18 is further provided with an oil cup 19 for oiling the hand wheel 4.

The beneficial effects of the technical scheme are that: through the design of above-mentioned structure, the packing 14 in the filling tank can be changed regularly as required and the phenomenon such as packing 14 age is avoided packing 14 age to the packing is too long to appear sealed not tight, cooperation between packing press sleeve 15 and the packing clamp plate 16 can adjust the compaction degree of packing 14 to resistance size when adjusting valve rod 2 for packing 14 motion through the compaction degree, and then the dynamics of turning of adjusting hand wheel 4, valve gap 18 can provide the 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, prevents that the axle junction from being dry.

In one embodiment, the bellows 9 is a spiral ripple, and an elastic member 20 is spirally arranged in the ripple; the inner wall of the bellows 9 is provided with a plurality of positioning columns 21 arranged along the axial direction, the side walls of the positioning columns 21 are abutted against the valve rod 2, after the bellows 9 is rotationally compressed, the top surfaces and the bottom surfaces of the adjacent two positioning columns 21 are abutted against each other, and a plurality of positioning columns 21 are abutted against each other and then positioned on the same central axis.

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 the sliding component is arranged between the upper disc 8 and the transition pipe 3, the rotating speed of the upper disc 8 is far smaller than that of the bellows 9, therefore, the spiral elastic piece 20 in the bellows 9 can twist, the bellows 9 can shrink along with the movement of the valve rod 2 in the twisting process until the bellows 9 twists to the limit position, the positioning columns 21 in the bellows 9 can abut against each other, the damage of the elastic piece 20 caused by the fact that the bellows 9 continues to twist is avoided, the valve rod 2 cannot continue to rotate when the bellows 9 cannot continue to rotate, the operator knows that the valve has reached 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 torsion of the elastic piece 20 until the upper disc 8 completely releases the torsion of the elastic piece 20, and the same is the same when the valve is closed.

The beneficial effects of the technical scheme are that: through the design of above-mentioned structure, reference column 21 can play spacing effect when bellows 9 twists reverse to the limit, 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, the valve clack 6 is provided with a mounting groove, the valve clack 6 is connected with the valve rod 2 through an anti-overflow device, the anti-overflow device is located below the valve cover 7 and in the mounting groove, and the anti-overflow device comprises: an inner coil 22, an outer coil 23 and a sleeve 24; the inner screw tube 22 is arranged in the mounting groove, the outer screw tube 23 is in threaded connection with the inner screw tube 22, the sleeve 24 is arranged in the outer screw tube 23, the bottom of the outer screw tube 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 part and a small lower part, the diameter of the upper end of the sleeve 24 is larger than that of the upper end of the outer screw tube 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 screw tube 22, the pressing block 27 is movably connected with the mounting groove, a limit groove 28 is arranged on the outer side wall of the sleeve 24, the upper end of the inner wall of the inner screw tube 22 is provided with a first clamping ring 29, the first clamping ring 29 is matched with the limit groove 28, the lower end of the sleeve 24 is provided with a second clamping ring 31, and the second clamping ring 30 is connected with the second clamping ring 31, and the third clamping ring 30 is arranged on the outer side wall of the sleeve.

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 so that the valve clack 6 can not rotate along with the valve rod 2, at the moment, the valve rod 2 continuously rotates again, the outer screw tube 23 is driven by the fixing piece 25 to continuously rotate, the inner screw tube 22 can downwards displace when the outer screw tube 23 rotates because the inner screw tube 22 is continuously rotated by the acting force of the valve clack 6, a speed difference can be formed between the inner screw tube 22 and the valve rod 2 because the screw pitch of the threaded connection between the outer screw tube 23 and the inner screw tube 22 is smaller, the moving speed of the inner screw tube 22 is larger than the moving speed of the valve rod 2, the inner screw tube 22 can downwards press the pressing block 27 into the mounting groove of the valve clack 6, the pressing block 27 enables the inner screw tube 22 to deform under the action of the valve clack 6, and then the first clamping ring 29 is clamped into the limiting groove 28, the sleeve 24 deforms and presses the valve rod 2 after being extruded by the first clamping ring 29, so that the valve rod 2 stops rotating, the valve rod 2 stops rotating by the larger hand wheel 4, and the hand wheel 4 is prevented from being locked by the error even if the operator forgets to turn the hand wheel 4 suddenly and the hand wheel is not found to be locked, and the direction is opened because the operator is not lost when the hand wheel is rotated.

The beneficial effects of the technical scheme are that: through the design of the structure, the screw pitch between the inner screw tube 22 and the outer screw tube 23 is smaller, so that the speed difference is formed between the inner screw tube 22 and the valve rod 2, the quick response of the anti-overflow device can be realized, the valve clack 6 is driven to move downwards relatively in the process of moving downwards the inner screw tube 22, the connection force between the valve clack 6 and the first through hole is increased, the acting force of the valve clack 6 on the inner screw tube 22 is increased, the anti-overflow device can be reset after the valve is closed, and when the valve is opened, even if the direction of the hand wheel 4 rotates wrong, the anti-overflow device can lock the valve rod 2 timely to remind an operator, and the condition that the valve is damaged due to the fact that the valve clack 6 penetrates through the first through hole is prevented.

In one embodiment, to achieve a seal of the packing 14 to the valve stem 2 while the packing press 15 is pressing the packing 14, the minimum compression height H of the packing 14 needs to be calculated by the following formula

H＝10(C+KP) ² /Q ²

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

The technical scheme has the working principle and beneficial effects that: the minimum contact height between the compressed filler 14 and the valve rod 2 is calculated through the formula, the tightness between the filler 14 and the valve rod 2 can be ensured as long as the height is larger than H, so that 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 exudation from a gap between the filler 14 and the valve rod 2 under the action of the liquid pressure.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.

Claims

1. A bellows seal device, 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); the transition pipe (3) is arranged at the top of the valve body (1), the sealing assembly is arranged at the top of the transition pipe (3), the valve rod (2) penetrates through the sealing assembly and extends into the valve body (1), the valve assembly is arranged at the end part of the valve rod (2) and is positioned in the valve body (1), the hand wheel (4) is arranged at the top end of the valve rod (2), the wave tube assembly is arranged on the valve rod (2) and is movably connected with the inner wall of the transition pipe (3), and the wave tube assembly comprises an upper disc (8), a corrugated tube (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 top inner wall of the transition pipe (3) through a sliding component, the top of the upper disc (8) is in butt joint with the bottom of the sealing component, the lower disc (10) is connected with the valve rod (2), the valve rod (2) penetrates through the lower disc (10), the corrugated pipe (9) and the upper disc (8), the corrugated pipe (9) is in spiral corrugation, and an elastic piece (20) is arranged in the corrugation in a spiral mode; be provided with a plurality of along axially setting's reference column (21) on the inner wall of bellows (9), the lateral wall of reference column (21) with valve rod (2) butt, after bellows (9) rotary compression, adjacent two the top surface and the bottom surface butt of reference column (21) and a plurality of behind reference column (21) butt lie in same central axis.

2. The bellows sealing device according to claim 1, characterized in that 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 plate (5) is arranged between the water inlet and the water outlet, a first through hole is arranged on the partition plate (5), and the valve assembly is movably connected with the first through hole.

3. A bellows sealing device according to claim 2, wherein the valve assembly comprises a valve flap (6) and a flap cover (7); the valve clack (6) is arranged at the bottom of the valve rod (2), the valve clack cover (7) is arranged on the side wall of the valve rod (2), the valve clack (6) is connected with the valve rod (2) through the valve clack cover (7), and the valve clack (6) is clamped with the first through hole.

4. The bellows seal of claim 1, wherein the sliding assembly comprises fireproof graphite (11), a number of annular sealing rings (12) and lip seals (13); the inner wall of transition pipe (3) is provided with the boss, the boss is located the top of transition pipe (3), upper disc (8) set up on the boss, fire prevention graphite (11) with ring seal (12) all set up on the lateral wall of upper disc (8), lip seal circle (13) set up on the bottom surface of upper disc (8) and upper disc (8) pass through lip seal circle (13) with boss swing joint.

5. Bellows sealing device according to claim 1, characterized in that the sealing assembly comprises a filler (14), a filler press sleeve (15), a filler press plate (16) and a sealing 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 in butt joint with 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, a filler (14) is arranged in the filling groove, the filler pressing sleeve (15) is arranged on the outer side wall of the valve rod (2) and is inserted into the filling groove, the filler pressing plate (16) is arranged at the top of the filler pressing sleeve (15) and the valve rod (2) penetrates through the filler pressing plate (16), and the filler pressing plate (16) is connected with the sealing cover plate (17) through bolts.

6. Bellows sealing device according to claim 5, characterized in that the top of the sealing cover plate (17) is provided with a valve cap (18), the valve stem (2) being connected with the hand wheel (4) through the valve cap (18).

7. Bellows sealing device according to claim 6, characterized in that an oil cup (19) is provided on the valve cap (18), which oil cup (19) communicates with the junction of the valve cap (18) and the valve stem (2).

8. A bellows sealing device according to claim 3, characterized in that the valve flap (6) is provided with a mounting groove, the valve flap (6) being connected to the valve stem (2) by means of an anti-overflow device, which is located below the flap (7) and in the mounting groove, the anti-overflow device comprising: an inner coil (22), an outer coil (23) and a sleeve (24); the inner screw tube (22) is arranged in the mounting groove, the outer screw tube (23) is in threaded connection with the inner screw tube (22), the sleeve (24) is arranged in the outer screw tube (23), the bottom of the outer screw tube (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 part and a small lower part, the diameter of the upper end of the sleeve (24) is larger than that of the upper end of the outer screw tube (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 screw tube (22), the pressing block (27) is movably connected with the mounting groove, the outer side wall of the sleeve (24) is provided with a large upper part and a lower part, the second side wall (29) is provided with a limit groove (30), the inner wall of the outer coil (23) is provided with a third clamping ring (31), and the top surface of the third clamping ring (31) is abutted with the bottom surface of the second clamping ring (30).