CN105626955A

CN105626955A - Packing seal structure

Info

Publication number: CN105626955A
Application number: CN201410599468.7A
Authority: CN
Inventors: 王小勇
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-10-31
Filing date: 2014-10-31
Publication date: 2016-06-01

Abstract

The invention discloses a packing seal structure, which comprises a valve body, a valve rod and a valve core, wherein the valve rod is arranged in the valve body, and the valve core is connected with the lower end of the valve rod; the packing seal structure also comprises a lower guide tube; two to four circles of lower packing rings are arranged above the lower guide tube; a middle seal tube is arranged above the lower packing rings; four to eight circles of upper packing rings are arranged above the middle seal tube; an upper guide tube is arranged above the upper packing rings; and the upper guide tube, the lower guide tube, the lower packing rings, the upper packing rings and the middle seal tube separately sleeve the valve rod and are separately in contact with the interior of the valve body. According to the packing seal structure provided by the invention, movement stability of the valve rod can be enhanced, and a valve problem brought by guiding of a sleeve can be solved; moreover, sealing on the valve rod part can also be enhanced, and the service life of packing is prolonged.

Description

A kind of packing seal structure

Technical field

The present invention relates to a kind of packing seal system, be particularly used for a kind of packing seal structure on valve.

Background technology

Block can be used for back and forth or the contact movable sealing of rotary motion of leakage path by filler, mainly have soft packing seal and hard packing to seal two classes. Soft packing seal is also known as packing_seal, and the radially swelling by the responsive to axial force of gland of the filler in stuffing-box, to reach sealing purpose. Soft packing is often made up of fiber (asbestos, nylon etc.), lubricant (graphite, molybdenum bisuphide, Pulvis Talci etc.) and various tinsel reinforcing agent. Can pass through to tight a bolt after filler abrasion to be compensated by. Wadding seal structure is simple, reliable, easily maintenance, corrosion-resistant and high temperature resistant, once it was widely used as rotating shaft and reciprocating rod member sealed, but contact area, frictional resistance, power consumption and abrasion are all relatively big, except still having employing except low speed stem movement, are replaced by mechanical seal gradually.

Existing valve rod is when motion, and stability is not enough, and adopts single packing seal, and sealing is not strong, causes that whole valve seal performance is bad.

Summary of the invention

The present invention provides a kind of packing seal structure, it is possible to strengthens the stability of stem movement, the problems with valves that elimination cage guiding brings, and can also strengthen the sealing at valve rod position, extends the service life of filler.

The purpose of the present invention reaches by the following technical programs:

A kind of packing seal structure, including valve body, the valve rod being arranged in valve body, it is connected to the spool of valve rod lower end, also include lower guide pipe, described lower guide pipe is arranged over the lower packing ring of 2 ~ 4 circles, lower packing ring is arranged over intermediate seal pipe, intermediate seal pipe is arranged over the upper packing ring of 4 ~ 8 circles, and upper packing ring is arranged over guide pipe, and upper guide pipe, lower guide pipe, lower packing ring, upper packing ring are socketed on valve rod with intermediate seal Guan Jun and contact with in valve body.

The setting of upper and lower guide pipe can stabilize valve rod from two ends, it is prevented that valve rod too vibrates, and plays the effect of the stability strengthening stem movement. The setting of lower packing ring and upper packing ring can strengthen the sealing at valve rod position from upper and lower two ends, and the setting of the sealing ring number of plies, the length that can coordinate intermediate seal pipe suitably increases and decreases the sealing ring number of plies, the sealing ring number of turns is suitably as well, the probability that sealing ring is corroded too much can be made to increase, if it is not good that the sealing ring number of turns crosses sealing effectiveness at least, and the length of intermediate seal pipe will suitably increase, and so also how much can cause the series of problems that sleeve pipe brings.

Lower packing ring and upper packing ring are provided with V-arrangement layer or the O shape layer of politef or perfluor mystery rubber.

For carburizing politef or polyether-ether-ketone outside the V-arrangement layer of described lower packing ring and upper packing ring or O shape layer. O-ring seals with low cost, good airproof performance, use wide ranges, and simple in construction has self-tightening, often only just can complete sealing with one sealing member, good sealing effect, during for reciprocating movement sealing, its sealing property is constant, medium amount of leakage is little. V-ring is a kind of lip-type packing, and in a free state, the lip portion outside diameter of v-ring is more than the internal diameter of packing cavity, and the internal diameter of lip is less than the external diameter of valve rod, and v shaped ring can seize power overlapping use by regulating thrust to obtain optimal seal effect.

Perfluoroelastomers material is high temperature resistant in current all elaxtic seals, chemical solvent resistance energy and the best elastomeric material of high-cleanness characteristic, chemical-resistant resistance and Korrosionsmedium (resistance to strong acid, highly basic, ethers, ketone, esters, nitrogen-containing compound, carbonization hydrogen species, alcohols, aldehydes, oil, the corrosion of more than the 1600 kind of chemical productss such as steam class, amine compound), heatproof, up to 327 DEG C, has wide applicability.

It is additionally provided with carbon packing ring below upper guide pipe, between carbon packing ring and upper packing ring, is provided with intervalve.

The liner circle layer of politef it is provided with in described upper guide pipe and downcomer. The position that upper guide pipe contacts with sealing ring with lower guide pipe is for the consideration of the sealing of total, it is also required to carry out sealing arrange, the liner circle layer of one layer of politef matched with its external diameter is set in upper guide pipe and lower guide pipe, to coordinate the overall tightness of reinforcing mechanisms with sealing ring.

Described upper guide pipe, lower guide pipe are identical with valve rod with the material of intermediate seal pipe is rustless steel.

The present invention compared with prior art, is had the following advantages that and beneficial effect:

The present invention is provided with the airtight and watertight padding combination of guide pipe, lower guide pipe and multi-layer sealed circle, the setting of the guide pipe up and down of this dual-top type guide frame enhances the stability of stem movement, compared with cage guiding, seal member is split as several, and one of them damages does not affect being continuing with of other, saves cost, increase operation rate, eliminate the problems with valves that cage guiding brings and the filling of double-deck stuffing box, strengthen the sealing at valve rod position.

Accompanying drawing explanation

Figure l is the structural representation of the present invention.

Wherein: 1, valve rod, 2, valve body, 301, upper guide pipe, 302, upper packing ring, 303, intermediate seal pipe, 304, lower guide pipe, 305, lower packing ring, 4, spool.

Detailed description of the invention

Embodiment l

As shown in Figure l, a kind of packing seal structure, including valve body 2, it is arranged on the valve rod l in valve body 2, it is connected to the spool 4 of valve rod l lower end, it is characterized in that: also include lower guide pipe 304, lower guide pipe 304 is arranged over the lower packing ring 305 of 2 ~ 4 circles, lower packing ring 305 is arranged over intermediate seal pipe 303, intermediate seal pipe 303 is arranged over the upper packing ring 302 of 4 ~ 8 circles, upper packing ring 302 is arranged over guide pipe 301, upper guide pipe 301, lower guide pipe 304, lower packing ring 305, upper packing ring 302 is all socketed on valve rod with intermediate seal pipe 303 and contacts with in valve body.

The setting of upper and lower guide pipe can stabilize valve rod from two ends, it is prevented that valve rod too vibrates, and plays the effect of the stability strengthening stem movement. The setting of lower packing ring 305 and upper packing ring 302 can strengthen the sealing at valve rod position from upper and lower two ends, and the setting of the sealing ring number of plies, the length that can coordinate intermediate seal pipe suitably increases and decreases the sealing ring number of plies, the sealing ring number of turns is suitably as well, the probability that sealing ring is corroded too much can be made to increase, if it is not good that the sealing ring number of turns crosses sealing effectiveness at least, and the length of intermediate seal pipe will suitably increase, and so also how much can cause the series of problems that sleeve pipe brings. Seal the number of turns one circle damage and can also replace intact sealing ring, extend the service life of sealing ring.

Embodiment 2

As shown in Figure l, lower packing ring 305 and upper packing ring 302 are equipped with V-arrangement layer or the O shape layer of politef or perfluor mystery rubber. For carburizing politef or polyether-ether-ketone outside the V-arrangement layer of lower packing ring 305 and upper packing ring 302 or O shape layer.

O-ring seals with low cost, good airproof performance, use wide ranges, and simple in construction has self-tightening, often only just can complete sealing with one sealing member, good sealing effect, during for reciprocating movement sealing, its sealing property is constant, medium amount of leakage is little. V-ring is a kind of lip-type packing, and in a free state, the lip portion outside diameter of v-ring is more than the internal diameter of packing cavity, and the internal diameter of lip is less than the external diameter of valve rod, and v shaped ring can seize power overlapping use by regulating thrust to obtain optimal seal effect.

Claims

1. a packing seal structure, including valve body (2), it is arranged on the valve rod (1) in valve body (2), it is connected to the spool (4) of valve rod (1) lower end, it is characterized in that: also include lower guide pipe (304), described lower guide pipe (304) is arranged over the lower packing ring (305) of 2 ~ 4 circles, lower packing ring (305) is arranged over intermediate seal pipe (303), intermediate seal pipe (303) is arranged over the upper packing ring (302) of 4 ~ 8 circles, upper packing ring (302) is arranged over guide pipe (301), upper guide pipe (301), lower guide pipe (304), lower packing ring (305), upper packing ring (302) is all socketed on valve rod with intermediate seal pipe (303) and contacts with in valve body.

2. a kind of packing seal structure according to claim l, it is characterised in that: lower packing ring (305) and be provided with V-arrangement layer or the O shape layer of politef or perfluor mystery rubber in upper packing ring (302).

3. a kind of packing seal structure according to claim l, it is characterised in that: for carburizing politef or polyether-ether-ketone outside the V-arrangement layer of described lower packing ring (305) and upper packing ring (302) or O shape layer.

4. a kind of packing seal structure according to claim l, it is characterised in that: upper guide pipe (301) lower section is additionally provided with carbon packing ring, is provided with intervalve between carbon packing ring and upper packing ring.

5. a kind of packing seal structure according to claim l, it is characterised in that: it is provided with the liner circle layer of politef in upper guide pipe (301) and downcomer (304).

6. a kind of packing seal structure according to claim l, it is characterised in that: described upper guide pipe (301), lower guide pipe (304) and the material of intermediate seal pipe (303) are identical with valve rod (1) is rustless steel.