CN2218285Y

CN2218285Y - U-shape screw sealing device

Info

Publication number: CN2218285Y
Application number: CN 94241352
Authority: CN
Inventors: 李从平; 高俊友
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-09-10
Filing date: 1994-09-10
Publication date: 1996-01-24
Anticipated expiration: 2004-09-10

Abstract

The utility model provides a U-shaped screw sealing device. A press cover (1) is fixed to a seal chamber (9), a spiral cover (8) with a spiral groove which is the opposite rotation direction to a shaft (12) is fixed on the shaft (12); a carbon ring (7) is arranged in the seal chamber and out of the spiral cover (8) through the press cover; the cross-section of the spiral groove on the spiral cover (8) forms a chamfering oily U shape; the carbon ring (7) is provided with a metal wire (6), and the inner and outer ends of the metal wire are respectively provided with a shield (10) and a buckle (5). The sealing device has good sealing effect, and long service life, and can transport low-viscosity liquid. The sealing position does not fire, and the carbon ring can be reused.

Description

U type spiral sealing device

The utility model provides a kind of shaft sealer that is used on the equipment for liquid transportation (as oil transfer pump).

On existing spiral sealing device, the fixed outside of axle has screw-casing, and the sense of rotation of the screw thread on this screw-casing is opposite with rotational axis direction, when axle rotates, the liquid of carrying in the pump will be thrown toward anti-leakage direction, gets back in the pump chamber, and reaching does not have the purpose of leakage.But because the spiral fluted cross section is rectangle, its chamfering is the right angle, and therefore when vibration equipment during big or axle decentraction, the chamfering on the easy and spiral chute of graphite annulus is collided and impaired, influences leak preventing effect.In addition, after liquid entered this rectangular coil groove, suffered resistance was big, so the gap between spiral chute and the graphite annulus need do greatlyyer, could realize lubricated to both, and hydraulic slip is easily caused when big in the gap, and this also influences leak preventing effect.Moreover the graphite annulus on the existing spiral sealing device is that single filling out inwards put, and when pump is carried out strip inspection or repairing, when needing to take out graphite annulus, graphite annulus can be damaged, and can not reuse, thereby cause waste.

The purpose of this utility model provides a kind of U type spiral sealing device, to improve its leak preventing effect and working life, solves the impaired problem of graphite annulus when taking out simultaneously.

The utility model is achieved in that on this seal arrangement the U-shaped of chamfering slyness is adopted in the spiral chute cross section on the screw-casing, is installed with wire at graphite annulus all graphite annuluss are contacted, and the inside and outside two ends of wire are connected with baffle plate and button respectively.

Adopt the U type spiral sealing device of said structure, because the spiral fluted sectional shape is a U-shaped, and the chamfering slyness, so fluid resistance reduces, and very fast meeting forms oil film between screw-casing and graphite annulus, so the gap between screw-casing and the graphite can be done lessly.Gap hour, wastage is little, and bearing capacity also increases relatively, good leak-proof effect.The gap is little, also can carry low-viscosity (mobile) liquid.In addition, slick and sly chamfering can prevent the graphite annulus clashing and breaking, has improved the working life and the leak preventing effect of graphite annulus.After graphite annulus is put on wire, can spur the button on the wire when dismounting, the baffle plate of wire the inner will intactly be pulled out each graphite annulus, and graphite annulus can be not impaired, and is reusable, the convenience when yet having improved simultaneously dismounting.The sealing device belongs to contactless shaft sealing, and the film lubrication state is good, does not have friction, does not generate heat long service life.To D, Y type oil transfer pump, also can save water cooling system.

Below in conjunction with description of drawings concrete structure of the present utility model.

Accompanying drawing is the schematic representation of the utility model structure.

As shown in drawings, on the U of the utility model type spiral sealing device, gland (1) is fixed on the seal chamber (9), the gland outer fixing has pressing plate (3), oil sealing (4) is fixed in the gland by pressing plate, axle (12) the inner is equipped with axle sleeve (11), having the spiral fluted screw-casing (8) opposite with axle (12) sense of rotation is fixed on the axle (12), graphite annulus (7) is installed in the seal chamber by gland, the outside of screw-casing (8), spiral chute sectional shape on the screw-casing (8) is the U-shaped of chamfering slyness, wire (6) is arranged in graphite annulus (7), in the wire, outer two ends have baffle plate (10) and button (5) respectively, and button (5) is installed in the hole (2) on the gland (1).

Claims

1.U type spiral sealing device, its gland (1) is fixed on the seal chamber (9), the gland outer fixing has pressing plate (3), oil sealing (4) is fixed in the gland by pressing plate, axle (12) the inner is equipped with axle sleeve (11), having the spiral fluted screw-casing (8) opposite with axle (12) sense of rotation is fixed on the axle (12), graphite annulus (7) is installed in the seal chamber by gland, the outside of screw-casing (8), it is characterized in that, spiral chute sectional shape on the described screw-casing (8) is the U-shaped of chamfering slyness, wire (6) is arranged in graphite annulus (7), in the wire, outer two ends have plate washer (10) and button (5) respectively, and button (5) is placed in the hole (2) on the gland (1).