CN2390054Y - Multi-stage shaft seal device - Google Patents

Abstract

The utility model relates to a multi-stage shaft sealing device which comprises a filler container formed between a valve (pump) body and a shaft. A primary sealing ring 1 and secondary sealing rings 2, 3, 4 which can prevent media from leaking out are arranged in the filler container, and a sealing ring 5 and an end cover 6 are positioned at a port of the filler container to prevent foreign matter and air out of the valve (pump) from entering shaft seal. Compared with universal filler sealing devices, the utility model has the advantages of simple structure, convenient installation, no fillers, small mechanical loss, favorable sealing performance, no leaking phenomenon in periods, strong versatility, and adopts local contact friction to realize sealing. The utility model is used for the shaft sealing of valves, reciprocating pumps, centrifugal pumps, or other rotary machines.

Description

A kind of multistage gland seal device

The utility model relates to the gland seal device of a kind of valve, reciprocating pump, centrifugal pump class, be meant a kind of multistage gland seal device especially.

General valve seal, water pump packing, the particularly sealing of reciprocating pump class at present mainly is packing seal.Packing seal exists that mechanical loss is big, working life is short, filling and the frequent defective of damage parts.

In view of above reason, the purpose of this utility model is for a kind of good seal performance is provided, and is simple in structure, highly versatile, long service life, the multistage gland seal device of applied range.

The utility model includes the filler that forms between valve (pump) body and the axle and contains, have in filler is contained and make medium not chopped-off head seal ring 1, the secondary seal ring 2,3,4 of past external leakage, seal ring 5 and end cap 6 are positioned at filler and contain a mouthful place, and its effect is that outer foreign matter of valve (pump) and air are not entered in the axle envelope.

The structure of above-mentioned seal ring 1,2,3,4 is monotype ring (calling monocycle in the following text), and the structure of seal ring 5 is convex table type U type ring (calling U type ring in the following text), and the function of two kinds of rings is basic identical, can intercourse use in multistage axle envelope.

Monocycle constitutes one by ring platform 11, interior ring 12, ring pin 13.The ring platform 11 that adopts can make seal ring and fixed cover 7 (see figure 1)s link together securely, the interior ring 12 that adopts has certain clearance with valve (pump) axle, and constituted ring-like space chamber 9,10 between the filler culvert wall, the ring pin 13 that adopts directly touches and less pretightening force (self-tightening power) is arranged with being coupling, referring to Fig. 1.

U type ring constitutes one by boss 14, interior ring 15, outer shroud 17, inside and outside ring pin.The boss 14 that adopts can with end cap 6 (or fixed cover) linking together securely, interior ring 15 and ring pin also have certain interval with axle respectively, encircle pin and be coupling and touch, and self-tightening power arranged, different is in it self has constituted annular space 19 between ring and the outer shroud, and outer shroud is directly contained wall with filler and fitted and seal and certain self-tightening power arranged; The effect of U type seal ring is identical with the function of above-mentioned One touch seal ring.

This multistage axle envelope can be used in the axle envelope of two kinds of Different Exercise Mode, that is: reciprocatory motion and rotate-stationary mode, and sealing principle is identical.When valve (pump) turned round, pressure of medium at first acted in the annular space (9) of chopped-off head seal ring (1) in it, made interior ring generation resiliently deformable enter working state with the axle applying and realized sealing; This moment, secondary seal 2,3,4 was not because of contacting with medium, the pressure of its annular space 10 slightly equals atmospheric pressure, therefore the secondary seal ring has certain clearance (have only the ring pin and be coupling and touch less self-tightening power) to be in standby working state with axle, when chopped-off head seal wears bad time, secondary seal ring 2,3,4 enters working state with above-mentioned working principle, and the like damage, enter one by one working state one by one and realize sealing.This multistage gland seal device, on-stream have only one-level touching friction and realize sealing with being coupling, and friction area is less, and injects a certain amount of lubricating grease again between secondary seal ring annular space and be lubricated, so mechanical loss is little, long service life.This axle is enclosed in and uses 8 year or more do not having leakage, no maintenance load its working life on the valve; On reciprocating pump, use, turn round its working life continuously about 2 years; Using the working life of turning round continuously on the Centrifugal water pump is more than 1 year.

Compare with general packing seal, the utlity model has following advantage:

1, simple in structure, easy for installation;

2, no filler adopts local contact friction to realize sealing, and mechanical loss is little;

3, good seal performance does not have weeping in the cycle;

4, highly versatile wide accommodation is used in the axle envelope of valve, reciprocating pump class, centrifugal pump and other rotary machine etc.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing:

Fig. 1 is the utility model structural representation

Fig. 2 is seal ring " One touch " structural representation

Fig. 3 is seal ring " U type ring " structural representation

Fig. 4 is a seal ring dynamic structure schematic representation

1-5-seal ring 6-end cap 7-retainer ring 8-valve (pump) body

Ring in the 9-annular space 10-space chamber 11-ring platform 12-

Ring 16-ring pin in the 13-ring pin 14-boss 15-

17-outer shroud 18-ring pin 19-U type annular groove 20-filler is contained

Referring to Fig. 1, seal ring 1 is the chopped-off head seal ring, and seal ring 2,3,4 is the secondary seal ring, and both structures are identical, and seal ring 5 is the final stage seal ring, and function is identical with above-mentioned seal ring; Chopped-off head seal ring and secondary seal ring all place valve (pump) body 8 and formed filler to contain, and the final stage seal ring places end cap 6 and integral body to be fixed by bolts to filler culvert mouthful place.

Referring to Fig. 2, the One touch seal ring is made one by ring platform 11, interior ring 12, ring pin 13, adopts elastic material to make.

Referring to Fig. 3, this ring has boss 14, interior ring 15, outer shroud 17, outer shroud pin 18, interior ring pin 16 to make one for " U-shaped formula " seal ring.The elastic material system of employing.

Referring to Fig. 1, seal ring 1,2,3,4 fits together with retainer ring 7 close and firm respectively, and integral body is enclosed within on the axle, and its ring pin is towards pressure medium one side, and seal ring 5 places end cap 6 and is enclosed within on the axle, and its ring pin is towards the outside of end cap 6; Form " closed " ring-like space 10 between seal ring and the seal ring, injected lubricating grease in it.The utility model constitutes seal assembly, can integral body place filler to contain 20.

Referring to Fig. 4, this figure is that sealing is dynamically schemed in the utility model.When valve (pump) is worked, the pressure of medium at first acts on the interior ring of chopped-off head seal ring 1, interior ring produces the part resiliently deformable, ring and ring pin thereof are fitted with axle and are formed sealing strip in making, owing to have lubricating grease to be lubricated again in less, the secondary seal ring 2,3 of sealing strip area of contact, mechanical loss is little, long service life; At this moment, be not subjected to the influence of pressure medium in the closed ring-like space 10 that the secondary seal ring forms, interior ring 2,3 is in free activestandby status, with axle certain interval is arranged, have only the ring pin and be coupling and touch less self-tightening power, when the chopped-off head seal wears was damaged, the secondary seal ring entered working state successively one by one with above-mentioned working principle; Final stage seal ring 5 (referring to Fig. 1), its ring pin touches and has less self-tightening power, its effect that outer air of valve (pump) and foreign matter are not entered in the axle envelope with being coupling towards the outside.

Claims (4)

1, multistage gland seal device, comprise the filler culvert (20) that valve (pump) body (8) and between centers form, it is characterized in that described filler contain have in (20) make the interior medium of valve (pump) not the seal ring of external leakage (1), (2, (3), (4), make outer foreign matter of valve (pump) and air not enter the interior seal ring (5) of axle envelope, closed annular space chamber (10) is arranged between seal ring (1), (2), (3), (4), and sealing (5) and end cap (6) are positioned at filler and contain a mouthful place.

2, multistage gland seal device as claimed in claim 1, it is characterized in that having respectively in described seal ring (1), (2), (3), (4) and seal ring all-in-one-piece ring platform (11), interior ring (12), ring pin (13) and retainer ring (7), constituted annular space (9), seal ring adopts elastic material to make.

3, multistage gland seal device as claimed in claim 1, it is characterized in that having respectively in the described seal ring (5) and seal ring all-in-one-piece boss (14), interior ring (15), ring pin (16), outer shroud (17), outer shroud ring pin (18), formed U type annular groove (19) between inside and outside ring, seal ring (5) adopts elastic material to make.

4, multistage gland seal device as claimed in claim 1, it is characterized in that the endoporus of fitting with seal ring (5) is arranged in the described end cap (6), the end cap that the filler of packing into is contained (20) part is cylindrical, and cover plate partly is disc or ellipse, and end cap (6) adopts metal or nonmetallic material to make.

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