CN203162154U

CN203162154U - Novel packing

Info

Publication number: CN203162154U
Application number: CN 201320156017
Authority: CN
Inventors: 魏东
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-03-29
Filing date: 2013-03-29
Publication date: 2013-08-28
Anticipated expiration: 2023-03-29

Abstract

The utility model relates to a novel packing. The novel packing comprises a strip-shaped body, and is characterized in that the longitudinal section of the strip-shaped body is an isosceles trapezoid with the bottom surface corresponding to the outer lateral surface, two edges of the isosceles trapezoid are of an symmetrical arc structure, and the bottom surface of the isosceles trapezoid is larger than the height of the isosceles trapezoid. The strip-shaped body can be made of aramid fibers, four-corner aramid reinforced graphite polytetrafluoroethylene, four-corner aramid reinforced polytetrafluoroethylene, polytetrafluoroethylene, carbon fibers, asbestos dipping polytetrafluoroethylene, carbon fiber reinforced graphite and acrylic fibers containing silica gel cores inside. After the novel packing is bent to form a ring, the outer surface of the novel packing is flat, and the novel packing is quite strong in sealing performance.

Description

Novel packing

Technical field

The utility model relates to a kind of packing, and particularly a kind of bending to encircled the novel packing that the back outer surface is smooth and sealing is extremely strong.

Background technique

Packing (packing) also named stuffing box packing, formed by soft thread braiding usually, and sectional area is that square or rectangular, circular bar are filled in the seal chamber usually, thereby realizes sealing.Packing seal is to stop liquid to flow leakage in leakage way with fiber plug such as linen-cottons the earliest, and mainly the axle as water lifting machinery seals.Because fill source is extensive, easy processing is cheap, and sealing is reliable, and is simple to operate, so use till today.Now packing is widely used in rotating shaft sealing, reciprocating pump, the reciprocal compressor of centrifugal pump, compressor, vacuum pump, stirrer and propeller for vessels, the reciprocating shaft envelope of refrigerator, and the turn sealing of various valve rods etc.

The axle surface can see it being very irregular under the microcosmic situation, can only partly fit with packing.So have small gap between packing and the axle, just as the labyrinth.Medium is repeatedly dammed in the labyrinth, thereby reaches seal action.

Packing seal is loaded in the stuffing box by filler, filler is pressed on the surface of axle by Gland.Because the axle total surface is coarse a bit, itself and filler can only be that part is fitted, and not contact of part, this just forms numerous labyrinth.When pressure medium was surperficial by axle, medium was reached sealing by repeatedly throttling by means of this " labyrinth effect ".Applying, friction that filler is surperficial with axle, also similar sliding bearing admittedly should there be enough liquid to be lubricated, is sealed with certain life-span i.e. so-called " bearing effect " with assurance.This shows good packing seal, namely is the comprehensive of labyrinth effect and bearing effect.

Filler produces by tightening gland bolt the impacting force of axle.Because filler is elastic plastic body, after being subjected to axial compression, producing frictional force and cause impacting force to reduce gradually vertically, the radial compaction power that produces simultaneously makes filler be close to the axle surface and stops medium to leak outside.The distribution of radial compaction power to the inner, became mild by outer end (gland) after sharply successively decreasing before this, the distribution of pressure medium is successively decreased gradually outward by the inner, when the outer end pressure medium is zero, then leaked seldom, leaked greater than zero the time.

By the distribution situation of radial compaction power as can be known, when the longitudinal section of packing is square, rectangular or when circular, because squeezing action, the outer surface out-of-flatness is caused to outer lug in the packing inner ring both sides that are behind the packing looped-shaped bending of this longitudinal section; This irregular outer surface is close to when arranging mutually, tends to cause sealing unreal, causes leakage.When isosceles trapezoid was adopted in the longitudinal section of packing, isosceles trapezoid two waists were because when being squeezed to the applying of axle surface for straight flange, the applying effect is not satisfactory.

The model utility content

The purpose of this utility model is to propose a kind of novel packing, and it is smooth and sealing is extremely strong that it bends to ring back outer surface.

For achieving the above object, the utility model discloses a kind of novel packing, comprise belt body, it is characterized in that: the longitudinal section of described belt body is the isosceles trapezoid of the corresponding outer side surface in bottom surface, and two waists of isosceles trapezoid are the arc structure of symmetry, wherein, the base of described isosceles trapezoid〉height of isosceles trapezoid, wherein, described belt body can be by aramid fibre, four jiaos of aramid fibers strengthen the graphite teflon, four jiaos of aramid fiber reinforced TFEs, teflon, carbon fiber, asbestos dipping teflon, carbon fibre-reinforced graphite, include a kind of the making in the acrylic fiber of silica gel core.

Pass through said structure, the beneficial effects of the utility model are: adopting the longitudinal section is that waist is that the packing of isosceles trapezoid of arc structure is behind looped-shaped bending, the outer ring is pushed to inner ring, arc structure more easily is extruded and fills to Internal and external cycle, make whole cross section become rectangle, when even curface is close to mutually like this, can guarantee sealing effect, be difficult for revealing.

Detailed content of the present utility model can obtain by explanation described later and institute's accompanying drawing.

Description of drawings

Fig. 1 is bent to form the structural representation of ring-type for the utility model;

Fig. 2 is longitudinal section of the present utility model schematic representation.

Embodiment

Below in conjunction with drawings and Examples embodiment of the present utility model is further described, following examples only are used for the technical solution of the utility model more clearly is described, and can not limit protection domain of the present utility model with this.

Extremely shown in Figure 2 as Fig. 1, the concrete technological scheme of implementing of the utility model is: a kind of novel packing, comprise belt body, it is characterized in that: the longitudinal section of described belt body is that the isosceles trapezoid of the corresponding outer side surface in bottom surface and two waists of isosceles trapezoid are symmetrical arc structure; The base of described isosceles trapezoid〉height of isosceles trapezoid.

In the utility model, described belt body can be made by aramid fibre, four jiaos of aramid fiber enhancing graphite teflon, four jiaos of aramid fiber reinforced TFEs, teflon, carbon fiber, asbestos dipping teflon, carbon fibre-reinforced graphites, also can be made by the acrylic fiber that includes the silica gel core.

In the utility model, described belt body also can be made by special spandex.Special spandex now is widely used in the packing as a kind of novel lamination coating.

The above only is preferential mode of execution of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims

1. novel packing comprises belt body, it is characterized in that: the longitudinal section of described belt body is that two waists of the isosceles trapezoid of the corresponding outer side surface in bottom surface and isosceles trapezoid are the arc structure of symmetry, the base of described isosceles trapezoid〉height of isosceles trapezoid,

Wherein, described belt body floods teflon, the acrylic fiber that includes the silica gel core, a kind of the making in the carbon fibre-reinforced graphite by aramid fibre, four jiaos of aramid fiber enhancing graphite teflon, four jiaos of aramid fiber reinforced TFEs, teflon, carbon fiber, asbestos.