CN201330848Y

CN201330848Y - Self-aligning mechanical sealing device

Info

Publication number: CN201330848Y
Application number: CNU2009200386478U
Authority: CN
Inventors: 丁郁华
Original assignee: JIANGSU HUAYANG HEAVY INDUSTRIES Co Ltd
Current assignee: JIANGSU HUAYANG HEAVY INDUSTRIES Co Ltd
Priority date: 2009-01-04
Filing date: 2009-01-04
Publication date: 2009-10-21
Anticipated expiration: 2019-01-04

Abstract

The utility model relates to a mechanical sealing device for shafting, especially a mechanical sealing device for marine vehicle transmission shafting. The self-aligning mechanical sealing device of the utility model comprises an end face seal pair composed of a dynamic ring and a static ring which are arranged and attached relatively, a dynamic ring base for coupling the dynamic ring and rotatablely fixed together with the rotating axle, elastic elements for providing the contact pressure of the dynamic ring and the static ring, and auxiliary seal parts mounted between the internal circumstance wall of the dynamic ring base and the dynamic ring, the dynamic ring and the static ring are in the sphere face slide contact. The utility model can reduce the leakage caused by the rotating axle cord eccentric center, and the manufacturing process is not complicated, the machining and the manufacturing are easy.

Description

Self-regulated scheming tool seal arrangement

Technical field

The utility model relates to axle system and uses mechanical seal device, relates in particular to boats and ships drive line mechanical seal device.

Background technique

Mechanical seal is that a kind of usefulness solves the device that seals between running shaft and the body, and its relies on elastic element the pretension of dynamic and static ring end face seal pair to be reached the axial end seal arrangement of sealing, so claim end face seal again.

The primary element that constitutes mechanical seal has: the end face seal pair, elastic element, secondary seal, driving component, rotation preventing device and the fastening piece that are the plane be made up of rotating ring and stationary ring.The effect of these primary elements and require as follows:

1. the end face seal pair of forming by rotating ring and stationary ring, its effect is that sealing surface is fitted tightly, and prevents dielectric leakage;

2. elastic compensating element, refer generally to spring, bellows, barrier film etc., it mainly plays pretension, compensation and buffering effect, requires to remain the inertia that enough elasticity overcomes the friction of auxiliary seal and driving component and rotating ring etc., guarantees the good driving fit of end face seal and the tracing ability of rotating ring;

3. auxiliary seal generally adopts O type, V-type, U type, wedge type or abnormity circle, and the seal action of its main starter ring and stationary ring also plays and float and the buffering effect simultaneously;

4. driving component generally is made of driving pin, transmission ring, retainer, driving key transmission lug or castellated coupling piece etc., mainly plays the effect of the torque of axle being passed to rotating ring;

5. fastening piece generally comprises Cock screw, spring seat, gland, assembling cover, axle sleeve etc., and it plays fastening, the positioning action of dynamic and static ring;

6. rotation preventing device can play the effect that prevents that stationary ring from rotating and deviating from.

Because the influence of factors such as mechanical vibration, running shaft gold machining, on-stream normal generation axial float of running shaft and axis angle displacement phenomenons such as (being eccentric axis), for axial float, because the speed of running shaft axial displacement is little, the compensating action of elastic element can make the good driving fit of dynamic and static ring sealing end face, generally can eliminate the leakage that axial float produces.Under the long situation of axle body, the phenomenon of eccentric axis happens occasionally, and the frequency that occurs generally increases along with the increase of rotating speed, because the seal face of dynamic and static ring mostly is the plane perpendicular to running shaft on the existing machinery seal arrangement, thereby rotating shaft eccentric make rotating ring axis and stationary ring axis do not overlap, not parallel, thereby cause the end face of rotating ring and stationary ring no longer to overlap.But form a subtended angle, thus cause leaking, though this subtended angle can be recompensed by elastic element, but since 1. the position of drift angle on the stationary ring end face of this subtended angle along with the rotation of rotating ring rotation change, and frequency is higher, and elastic element has little time whole compensation, can only partly compensate; 2. the displacement in rotating seat has certain inhibition to secondary seal to rotating ring, and this makes that the servo-actuated of rotating ring is not fine, can not in time all eliminate the subtended angle between the dynamic and static ring.

Above-mentioned factor makes that the sealing effect of existing machinery seal arrangement is not very desirable, does not find better solution at present as yet.

The model utility content

At the above-mentioned deficiency of existing in prior technology, topic is that a kind of self-regulated scheming tool seal arrangement will be provided between technology to be solved in the utility model, and it can reduce the leakage that causes owing to rotating shaft axis off-centre, and structure is uncomplicated, manufacturing easily.

In order to solve the problems of the technologies described above, the utility model self-regulated scheming tool seal arrangement, comprise the end face seal pair that constitutes by rotating ring that is oppositely arranged and fits and stationary ring, be used for the described rotating ring of socket and and running shaft be secured to together rotating seat, the elastic element of described rotating ring and stationary ring contact pressure be provided, and be installed in the inner circle wall of described rotating seat and the secondary seal between the rotating ring, described rotating ring and the sliding contact of stationary ring sphere.

After adopting said structure, because rotating ring and the sliding contact of stationary ring sphere, when the eccentric axis of running shaft, though rotating ring axis and stationary ring axis do not overlap, but rotating ring end face and stationary ring end face can slide and fit all the time by deflection, and whole mechanical seal device still can keep excellent sealing performance.

The seal face of stationary ring and rotating ring not only can be respectively the sphere of indent and the sphere of evagination; Can also be respectively the sphere of evagination and the sphere of indent; The seal face that can also be stationary ring is the sphere of indent, and the seal face of rotating ring is the plane.

Description of drawings:

Below in conjunction with the drawings and specific embodiments the utility model self-regulated scheming tool seal arrangement is described in further detail.

Fig. 1 is the structural representation that the utility model self-regulated scheming tool seal arrangement is applied to a kind of embodiment of screw shaft of ship mechanical seal.

Embodiment

Among Fig. 1, the seal face of stationary ring 7 is the sphere of indent, and be fixedly attached on the hull, rotating seat 4 is fixedly sleeved in spring seat 2, spring seat 2 is fixedly attached on the rotary sleeve 1, be set with rotating ring 6 in the rotating seat 4, the periphery wall upper edge of rotating ring 6 circumferentially is evenly equipped with 6 axial locating slots, be evenly equipped with 6 positioning screw holes on the perisporium corresponding position of rotating seat 4, enter behind the positioning screwn screw-in positioning screw hole in the locating slot on rotating ring 6 periphery walls, positioning screwn does not contact (locating slot among the figure with the bottom of locating slot, positioning screw hole, positioning screwn does not all draw), rotating ring 6 and rotating seat 4 are not relatively rotated, thereby rotating ring 6 is passed in the torque of running shaft.The seal face of rotating ring 6 is the sphere of evagination, and and stationary ring 7 be in the seal face of concave spherical surface fit, between two inner circle walls of rotating ring 6 and rotating seat 4 secondary seal 5 is installed respectively, this secondary seal 5 is rubber " O " type circle, because rubber " O " type circle has elasticity, the bottom of locating slot does not contact on set screw on rotating seat 4 periphery walls nail and rotating ring 6 periphery walls, and rotating ring 6 and rotating seat 4 axial sphere sliding contacts, and the displacement of stern tube shaft circular runout is generally less than 0.1mm, thereby rotating ring 6 can be done deflection among a small circle in rotating seat 4, rotating seat 4 and spring seat 2 also is equipped with the elastic element 3 of 12 performance unanimities between axially, this elastic element 3 is a spring, make the seal face of rotating ring 6 be close to vertically on the seal face of stationary ring 7, rotating ring 6 adopts macromolecular material to make.Because rotating ring 6 very light weight that macromolecular material is made, thereby the inertia of rotating ring 6 is less, helps improving the servo-actuated of rotating ring 6.

When circular runout and eccentric axis phenomenon take place running shaft simultaneously, slide by the deflection between deflection slip and rotating ring 6 and the rotating seat 4 in the indent spherical end face of stationary ring 7 of the end face of rotating ring 6 and to regulate compensation jointly.

The axial float of running shaft is recompensed by elastic element 3 because frequency is lower.

Above-mentioned mode of execution only is the utility model one of mode of execution preferably, and the seal face of its stationary ring and rotating ring not only can be respectively the sphere of indent and the sphere of evagination; Can also be respectively the sphere of evagination and the sphere of indent; The seal face that can also be stationary ring is the sphere of indent, and the seal face of rotating ring is the plane.These changes all fall among the protection of the utility model self-regulated scheming tool seal arrangement.

Claims

1. self-regulated scheming tool seal arrangement, comprise the end face seal pair that constitutes by the rotating ring that is oppositely arranged and fit (6) and stationary ring (7), be used for the described rotating ring of socket (6) and and running shaft be secured to together rotating seat (4), the elastic element (3) of described rotating ring (6) and stationary ring (7) contact pressure be provided, and be installed in the inner circle wall of described rotating seat (4) and the secondary seal (5) between the rotating ring (6), it is characterized in that: described rotating ring (6) and stationary ring (7) sphere sliding contact.

2. self-regulated scheming tool seal arrangement according to claim 1, it is characterized in that: the seal face of described stationary ring (7) is interior concave spherical surface, the seal face of described rotating ring (6) is the sphere of evagination.

3. self-regulated scheming tool seal arrangement according to claim 1, it is characterized in that: the seal face of described rotating ring (6) is interior concave spherical surface, the seal face of described stationary ring (7) is the sphere of evagination.

4. self-regulated scheming tool seal arrangement according to claim 1, it is characterized in that: the seal face of described stationary ring (7) is interior concave spherical surface, the seal face of described rotating ring (6) is the plane.

5. self-regulated scheming tool seal arrangement according to claim 1 is characterized in that: the axially sphere sliding contact of described rotating ring (6) and rotating seat (4).