CN2296418Y

CN2296418Y - Double seal ring type single function slurry pump piston

Info

Publication number: CN2296418Y
Application number: CN 96220394
Authority: CN
Inventors: 王兆修
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-08-18
Filing date: 1996-08-18
Publication date: 1998-11-04
Anticipated expiration: 2006-08-18

Abstract

The utility model relates to a novel double seal ring type single function slurry pump piston in the petroleum drilling machinery and the construction machinery. The utility model is composed of a piston body, two double seal labium type seal rings whose openings are opposite, arranged on the middle part of the external circle, a closing ring, and a location mechanism. The two seal rings of the novel piston are respectively responsible for the actions of sucking and extruding the slurry. The retaining slurry in the cavity between the two seal rings can well play the actions of sealing and lubricating, and the action life time of the piston can be effectively prolonged. When the seal rings are abraded, the new seal rings can be conveniently changed by disassembling the location clamp catch and the closing ring.

Description

Double density seal formula single-acting mud piston

The utility model relates to the novel piston of single-acting slurry pump in a kind of oil drilling machine and the building machinery industry.

In oil drilling and construction industry work, the piston of single-acting slurry pump, only single lip seal circle is arranged at the extrusion end, but when sucking mud, also need suck mud with this seal ring, the sealing lip of seal ring just inwardly shrinks because of suction, sealability and big the reduction, thereby make the slurry pump suction pressure little, workpiece efficient is low.

Current for addressing this problem, normally increase the hardness of seal ring, but this makes again its elasticity reduce, and uses one period very short time at seal ring, sealing lip just can not use after wearing and tearing.Therefore, make seal ring work more reasonable, the working life of greatly improving piston, and after being worn, seal ring can change seal ring easily, shorten the time of changing piston, alleviate the labor intensity of this work, just become a new problem in oil drilling and the construction industry.

For addressing this problem, the utility model has designed a kind of double density seal formula single-acting mud piston, and it not only can make the seal ring working forms more reasonable, increases the suction that sucks mud, and can prolong the working life of seal ring effectively; Behind ring wear, do not need the demolition piston body, just can change seal ring easily, both can shorten dead time, can reduce labor intensity again.

Task of the present utility model is finished like this: between the round platform of piston body cylindrical one side and back-up ring two openings double-sealing lip-type seal circle is in opposite directions arranged, in the middle of the groove opposite of two seal rings a cross section being arranged is the control ring of T-shape, makes seal ring unlikely rolling when work.Opposite side at two seal rings is a back-up ring, is used for fixing the position that sucks the slurry seal ring, and accepts it and transmit the pressure of coming.In the outside of back-up ring is that positioning ring can be jump ring or circle, also demountable positioning means to the positioning ring of back-up ring location.

Therefore the utility model had both guaranteed also to have guaranteed suction pressure by extruder pressure because when piston sucks and extrude mud, alternately sealed by two seal rings.Because two seal rings are made of corrosion-resistant, wear-resisting elastic material, and there have mud to participate in as medium all the time in the cavity between two seal rings to be lubricated, thereby make the better tightness of seal ring, longer service life.And can make removablely to the positioning ring of back-up ring location, behind ring wear, just can easily seal ring be pulled down, change new seal ring, therefore more increase the working life of piston body, shortened the time of changing piston, alleviated labor intensity.

Structure of the present utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is a sectional drawing of the present utility model, and Fig. 2 is a partial sectional view.

The utility model that sees figures.1.and.2 will enclose (8), positioning ring (9) formation by piston body (2), seal ring (4), (7), retaining, and piston body (2) endoporus is in order to circular hole that cooperates with piston pulling rod or taper hole (1).Round platform (3) in a side of the cylindrical of piston body (2), and two openings double-sealing lip-type packing (4) and (7) are in opposite directions arranged between the back-up ring (8), in the middle of the groove of seal ring (4) and (7) cross section being arranged is the control ring of T-shape (5), in the bottom of seal ring (7) is back-up ring (8), in the outside of back-up ring (8) positioning ring (9) is arranged, be stuck in the groove (13) of piston body.When piston extrudes mud, mud is full of between the anterior lips of seal ring (4), increase with pressure, its lips open to be close on cylinder sleeve and the piston body and produce seal action, when piston sucked mud, mud loosened the lips of seal ring (4), sealed and the lips of seal ring (7) are opened, two seal ring alternations, thus extrude or suck mud.And two edges of control ring (6) directly are supported in the groove of two sealings (4) and (7), make its unlikely at work distortion and roll.Back-up ring (8) plays location and support effect to bearing the seal ring (7) that sucks mud pressure, and positioning ring (9) then positions back-up ring (8), is stuck in the groove (13) of piston body (2).Positioning ring (9) is a spring ring, also the circle of an integral body.

With reference to Fig. 2, another program of embodiment is that the positioning ring in the outside of back-up ring (8) is that two semicircular ring (10) are stuck in piston body (2) groove (13), a cover annulus (11) and be stuck in jump ring (12) in two semicircular ring (10) groove on the cylindrical of two semicircular ring (10).

Because the pressure that extrudes mud and suck mud is alternately born in two seal rings (4) and (7), and is rational in infrastructure, so extruder pressure and suction pressure are all very high; Owing to its good springiness, after being worn, it can also rely on its resiliently deformable to work on again, thereby long service life.In a second embodiment, as long as behind ring wear, tear jump ring (12), annulus (11), two semicircles (10) open, retaining circle (8) just can replace with Xinmi City's seal very easily.

Claims

1, a kind of double density seal formula single-acting mud piston, mainly by piston body, seal ring, back-up ring, positioning ring is formed, it is characterized in that: there are two openings double-sealing lip seal circle (4) and (7) in opposite directions round platform (3) and back-up ring (8) centre in piston body (2) periphery one side, and in the middle of the groove of seal ring (4) and (7) cross section being arranged is the control ring of T-shape (5).

2, piston according to claim 1 is characterized in that in order to the positioning means of fixing back-up ring (8) by two semicircular ring (10) be enclosed within the collar (11) of its cylindrical and the jump ring (12) that is set in the groove of two semicircular ring (10) is formed removable or positioning means.

3, piston according to claim 1 is characterized in that in order to the fixing positioning ring (9) of back-up ring (8) be the spring ring of an opening, also whole circle.

4, two seal rings (4) and (7) according to claim 1,2 or 3 described pistons are double-sealing lip formulas, are manufactured by corrosion-resistant, anti abrasive elastic material.