CN215058417U - Mechanical sealing device for liquid - Google Patents

Abstract

The utility model discloses a mechanical seal device for liquid for the sealed axis of rotation that passes equipment casing, include: the end face of the movable sealing ring is attached to the end face of the static sealing ring by virtue of a spring to form a sealing interface vertical to the axial direction, and the sealing interface comprises an attachment point contacted with a liquid medium on the axial section; and the annular surrounding edge surrounds the movable sealing ring and the static sealing ring to be used for stirring a liquid medium, at least one part of the surrounding edge is provided with an inclined surface inclined towards the fitting point, the inclined surface comprises an initial point close to the fitting point and a termination point far away from the fitting point on an axial section, the initial point and the fitting point are separated by a distance, and the termination point does not exceed the fitting point along the axial direction. The utility model provides a mechanical seal device for liquid can enough effectively let impurity in the liquid medium keep away from sealed interface, have good processing economic nature again.

Description

Mechanical sealing device for liquid

Technical Field

The utility model relates to a mechanical seal technique, more specifically, the utility model relates to a mechanical seal device for liquid with enclose along design.

Background

Generally, a rotating device includes a rotating shaft and a device housing, and a liquid seals the rotating shaft passing through the device housing with a mechanical sealing device to isolate the liquid inside the device housing from air outside the device housing. The mechanical sealing device for liquid comprises a movable sealing ring and a static sealing ring which are arranged around a rotating shaft, wherein the end surface of the movable sealing ring is attached to the end surface of the static sealing ring by a spring so as to form a sealing interface which is perpendicular to the axial direction.

In the industrial production processes of metallurgy, electricity, petrochemistry, coal mines, paper making and the like, it is necessary to convey slurry liquids containing impurities such as hard particles or fibers by means of rotating equipment (for example, pumps) with mechanical sealing means for liquids. However, impurities in the slurry liquid are easily accumulated between the clearance between the movable sealing ring of the mechanical sealing device and the rear pump cover, scale is formed between the static sealing ring and the O-shaped ring of the static sealing ring, and the impurities may collide and enter the sealing interface, so that the movable sealing ring and/or the static sealing ring lose the axial compensation capacity due to the clamping. Moreover, in the case where hard particles in the slurry liquid enter the seal interface, the end faces of the dynamic seal ring and the static seal ring are also worn.

In the existing designs, the solutions to the above problems are: arranging the movable sealing ring and the static sealing ring to be flush at one side of the sealing interface, which is contacted with the liquid, so as to avoid impurities in the liquid from accumulating at the sealing interface, colliding and entering the sealing interface; the side of the sealing interface in contact with the air need not be flush because there is no problem with impurities, but one of the dynamic and static sealing rings is truncated for the purpose of reducing friction. This is a rational design that is in line with fluid mechanics and thermodynamics. Although it has also been proposed in the prior art to provide the dynamic and static seal rings higher than the other on the side of the sealing interface that is in contact with the liquid, the effect of impurities in the liquid on the sealing interface is often ignored.

In summary, the following difficulties exist in applying mechanical sealing devices for liquids to rotating equipment such as slurry liquid pumps: the dynamic sealing ring and the static sealing ring in the slurry liquid are seriously abraded and are very easy to damage to cause the leakage of a pump; the service life of the mechanical sealing device for the liquid is too short, so that the mechanical sealing device for the liquid needs to be frequently replaced under the condition that the pump stops running, and economic loss is caused; a large amount of washing water is needed to wash the liquid by using the mechanical sealing device, so that resource waste and cost rise are caused.

Furthermore, in chinese patent CN 209856382U, it is proposed to provide one of the dynamic or static seal rings with a rim on the side of the seal interface contacting the liquid, the rim comprising an inclined surface inclined towards the other of the dynamic or static seal rings, under the condition that the rim causes the turbulent flow of the liquid in flow, the impurities in the liquid also leave the seal interface along the inclined surface due to centrifugal force. Although this design improves the life cycle of the seal, the process of machining the dynamic and/or static seal ring becomes complicated and less flexible.

SUMMERY OF THE UTILITY MODEL

In order to solve the not enough among the current mechanical seal device for liquid, the utility model provides a can enough effectively let impurity among the liquid medium keep away from seal face, have the mechanical seal device for liquid of good processing economic nature again to reduce impurity and pile up in seal face department and collide and get into the possibility of seal face.

According to an aspect of the present invention, there is provided a mechanical sealing device for liquid, for sealing a rotation shaft passing through an apparatus casing to prevent leakage of a liquid medium in the apparatus casing, the mechanical sealing device for liquid comprising: the movable ring seat is fastened on the rotating shaft and supports the movable sealing ring, the static ring seat is fastened on the equipment shell and supports the static sealing ring, the end face of the movable sealing ring is attached to the end face of the static sealing ring by means of a spring to form a sealing interface perpendicular to the axial direction, and the sealing interface comprises an attachment point contacting with a liquid medium on the axial section; and the annular is along, enclose along around moving sealing ring and static sealing ring in order to be used for stirring liquid medium, at least partly be formed with towards the inclined surface in the laminating point slope on enclosing along, inclined surface is including being close to the initial point in laminating point and keeping away from the termination point in laminating point on axial cross section, and initial point and laminating point separate one section distance and termination point do not surpass laminating point along the axial.

Optionally, the skirt is integrally formed with one of the static seal ring and the dynamic seal ring such that a cross-section of the one of the static seal ring and the dynamic seal ring is higher than a cross-section of the other of the static seal ring and the dynamic seal ring and such that a portion of the one of the static seal ring and the dynamic seal ring is in abutment with the other of the static seal ring and the dynamic seal ring.

Optionally, the skirt is integrally formed with the moving ring seat, and wherein the skirt protrudes from the moving ring seat to seat on an outer peripheral surface of the moving seal ring; or wherein the skirt extends along the driven ring seat and is spaced a distance from the dynamic seal ring.

Optionally, the peripheral edge is integrally formed with the stationary ring seat, and a side of the peripheral edge facing away from the fitting point is configured to abut against an inner wall surface of the device housing.

Optionally, the mechanical sealing device for liquid further includes an additional component in a cylindrical or annular shape, the surrounding edge is integrally formed with the additional component, the additional component is detachably mounted on the side of the movable ring seat, which is opposite to the side of the movable ring seat, in the axial direction, on which the movable sealing ring is supported, and a generatrix of the outer circumferential surface of the movable ring seat is parallel to the axial direction or forms an included angle with the axial direction.

Alternatively, the dynamic seal ring is connected to the outer peripheral surface or the inner peripheral surface of the dynamic ring seat by means of an O-ring, and the static seal ring is connected to the outer peripheral surface or the inner peripheral surface of the static ring seat by means of another O-ring.

Optionally, the inclined surface comprises at least one of a straight surface, a curved surface, a corrugated surface.

Optionally, the axial cross-section of the envelope is configured to include at least one of a cone, a polygon, and an arc.

Optionally, the rim is disposed only on the outside of the sealing interface, or the rim is disposed only on the inside of the sealing interface.

Optionally, the dynamic seal ring and the static seal ring are each of unitary or split construction.

Optionally, the method further comprises: a gland connected to the stationary ring seat; and the shaft sleeve is sleeved on the rotating shaft, and the shaft sleeve and the movable ring seat integrally extend or are connected to the movable ring seat as an independent component so as to assemble the movable ring seat, the movable sealing ring, the static ring seat and the spring together to form an integrated mechanical seal.

The utility model discloses the beneficial effect who reaches lies in:

(1) the surrounding edge is designed to stir the flowing liquid medium to form turbulent flow, so that the liquid medium changes in temperature, flow speed and pressure, wherein impurities mixed in the liquid medium, especially hard particles, cannot be deposited along with the chaotic motion of the liquid medium, and therefore the impurities are prevented from accumulating at the sealing interface and colliding with and entering the sealing interface;

(2) the design of the surrounding edge plays the roles of a barrier and a pump effect, so that impurities in a liquid medium are effectively prevented from entering a sealing interface, namely a mechanical seal running area, and the heat dissipation of a static sealing ring and a dynamic sealing ring serving as sealing rings is facilitated, so that the thermal deformation is reduced;

(3) the movable sealing ring and/or the static sealing ring can be respectively connected to the movable ring seat and/or the static ring seat on the inner circumferential surface and/or the outer circumferential surface by means of O-shaped rings, so that the heat dissipation area is further enlarged; and

(4) the sealing effect of the mechanical sealing device for liquid is obviously improved, and the service life is prolonged.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is an axial sectional view of a mechanical sealing device for liquid mounted on a rotating apparatus according to an embodiment of the present invention;

FIG. 2 is a detailed axial cross-sectional view of the static and dynamic seal rings of the mechanical liquid seal assembly of FIG. 1;

fig. 3 is an axial sectional view of a mechanical sealing device for liquid mounted on a rotating apparatus according to another embodiment of the present invention;

FIG. 4 is a detailed axial cross-sectional view of the static and dynamic seal rings of the mechanical liquid seal assembly of FIG. 3;

fig. 5 is an axial sectional view of a mechanical sealing device for liquid mounted on a rotating apparatus according to another embodiment of the present invention;

fig. 6 is an axial sectional view of a mechanical sealing device for liquid mounted on a rotating apparatus according to another embodiment of the present invention;

fig. 7 is an axial sectional view of a mechanical sealing device for liquid mounted on a rotating apparatus according to another embodiment of the present invention;

fig. 8 is an axial sectional view of a mechanical sealing device for liquid mounted on a rotating apparatus according to another embodiment of the present invention; and

fig. 9 is an axial sectional view of a mechanical sealing device for liquid mounted on a rotating apparatus according to another embodiment of the present invention.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention.

Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Hereinafter, the present invention provides a mechanical sealing device for liquid, also referred to as a sealing device. The exemplary sealing device is suitable for use with rotating equipment, such as a pump. The rotating apparatus includes an apparatus housing 101 and a rotating shaft 100 penetrating the apparatus housing 101 to be at least partially built in the apparatus housing 101, and in view of this, "axial direction" refers to a direction along an axis L of the rotating shaft 100. "section" means a vertical plane including the axis L of the rotating shaft 100, "end surface" means a plane perpendicular to the axis L of the rotating shaft 100, "front" means a direction axially further into the apparatus casing 101, i.e., toward the left side of each figure, "rear" means a direction axially away from the apparatus casing 101, i.e., toward the right side of each figure, "inner" means a direction radially close to the axis L of the rotating shaft 100, and "outer" means a direction radially away from the axis L of the rotating shaft 100.

In general, each of the exemplary sealing devices shown in fig. 1 to 9 includes a plurality of parts assembled together, which cooperate with each other to seal the rotating shaft 100 with respect to the apparatus case 101, thereby preventing the liquid medium inside the apparatus case 101 from leaking. These exemplary sealing means may be of the cartridge type or of the split type.

The plurality of components may encompass a rotating ring fixed to the rotating shaft 100 to rotate together with the rotating shaft 100, and a stationary ring fixed with respect to the apparatus housing 101 not to rotate together with the rotating shaft 100.

The rotating ring comprises a rotating ring seat 1 and a rotating sealing ring 2 supported by the rotating ring seat 1, and the rotating sealing ring 2 is positioned in the circumferential direction relative to the rotating ring seat 1 through a plurality of positioning pins 3 to prevent relative rotation.

The stationary ring comprises a stationary ring seat 5 and a stationary sealing ring 4 supported by the stationary ring seat 5, the stationary ring seat 5 is provided with a number of springs 6 pushing the stationary sealing ring 4 forward, and the stationary sealing ring 4 is positioned circumferentially with respect to the stationary ring seat 5 by a number of positioning pins 8 to prevent relative rotation. The spring 6 urges the static seal ring 4 forward against the dynamic seal ring 2 such that a certain axial pressure is maintained between the dynamic seal ring 2 and the static seal ring 4 and the dynamic seal ring 2 is allowed to rotate relative to the static seal ring 4. In the present invention, the spring 6 is preferably a cylindrical small spring, or the spring 6 may be replaced by a bellows.

The stationary ring holder 5 may be fastened to a rear wall surface of the apparatus case 101 by a plurality of bolts 7 to cover a hole of the apparatus case 101 through which the rotating shaft 100 passes. It can also be said that, in the present invention, the stationary ring seat 5 also serves as a gland well known in the art. Additionally or alternatively, the sealing means may include a gland connected to the stationary ring base 5, and the gland is fastened to the rear wall surface of the equipment housing 101 by a plurality of bolts 7 to cover the hole of the equipment housing 101 through which the rotating shaft 100 passes.

One or both of the dynamic seal ring 2 and the static seal ring 4 may have a unitary or split structure, i.e., include a pair of semicircular ring-shaped halves which are combined together about the rotational axis 100 in opposition to each other to constitute a complete seal ring. At the joint interface, i.e. the split plane, between the two halves, structures may be provided that fit into each other, e.g. male and female, in order to maintain the connection between the two halves. Viewed in the axial direction, the split line between the two halves is perpendicular to the axial direction.

If both the dynamic seal ring 2 and the static seal ring 4 are split, the split surfaces of both need to be offset from each other in the circumferential direction.

The utility model discloses consider the problem that moves sealing ring 2 and quiet sealing ring 4 and be convenient for change, preferably both adopt the subdivision formula structure. However, it is also within the scope of the present invention that only one of the dynamic seal ring 2 and the static seal ring 4 (particularly, the one that is easily worn) is of a split type structure.

The material of the dynamic seal ring 2 and the static seal ring 4 may be any one of plastic, ceramic (e.g., silicon carbide), graphite, and metal alloy (e.g., tungsten carbide). The movable ring seat 1 and the stationary ring seat 5 may be made of metal alloy, such as 316 stainless steel and 304 stainless steel.

In the following, a number of embodiments relating to the design of the annular skirt provided by the present invention will be described, it being noted that said embodiments may be combined or used separately, depending on the specific application scenario.

In the embodiment seen in fig. 1 and visible in detail in fig. 2, the skirt 102 is integrally formed with the static seal ring 4 and is disposed immediately adjacent to the seal interface 9. Specifically, the stationary ring seat 5 may be opened with an annular groove 14 into which the spring 6 may extend, a rear end portion of the stationary seal ring 4 being received in the annular groove 14 to be urged forward by the spring 6, so that an end surface formed by a front end portion of the stationary seal ring 4 abuts against an end surface of the movable seal ring 2 to constitute a seal interface 9 perpendicular to the axial direction, the seal interface 9 including, in cross section, an abutment point C contacting the liquid medium₁. Further, the rear end portion of the stationary seal ring 4 is connected to the stationary seat 5 on the inner peripheral surface by means of an O-ring 11.

The skirt 102 extends from a front end portion of the static seal ring 4, radially away from the seal interface 9 as approaching axially to the seal interface 9, to surround the dynamic seal ring 2 and the static seal ring 4. The section of the skirt 102, which is integral with the static seal ring 4, is higher than the section of the dynamic seal ring 2 and the section of the dynamic seat 1, and a portion of one of the static seal ring 4 and the dynamic seal ring 2 is fitted to the other of the static seal ring 4 and the dynamic seal ring 2.

In fig. 1 and 2, the cross-section of the skirt 102 is shown as tapered, but it is understood that the cross-section of the skirt 102 may be configured to include, but is not limited to, at least one of tapered, polygonal (e.g., triangular, rectangular, pentagonal, etc.), and arcuate, as long as the skirt 102 protrudes more into the liquid medium than the moving seal ring 2 and moving ring seat 1 to act to agitate the flowing liquid medium in the vicinity of the seal interface 9, creating turbulence, causing the liquid to vary in medium temperature, flow rate, and pressure, wherein impurities, particularly hard particles, in the liquid medium will also be unable to settle with chaotic movement of the liquid medium.

At least a portion of the peripheral edge 102 is shaped with a direction towards the point of abutment C₁The inclined surface 102A, along which impurities present in the agitated liquid medium are discharged by centrifugal force to be away from the sealing interface 9. The centrifugal force is generated due to the rotation of the rotating shaft 100.

For example, in FIG. 2, the inclined surface 102A includes, in cross-section, proximate to the point of abutment C₁Starting point A of₁And away from the point of application C₁End point B of₁Starting point A₁And the point of attachment C₁Spaced apart by a distance and terminating at a point B₁Does not exceed the joint point C along the axial direction₁. End point B₁Is the highest point of the cross-section that protrudes into the liquid medium. Starting point A₁And end point B₁The connecting line between them is inclined towards the fitting point C. Starting point A₁And the point of attachment C₁The connecting line between them is configured as a polyline.

The inclined surface 102A may be configured to include, but is not limited to including, at least one of a straight surface, an arcuate surface, a corrugated surface.

Additionally or alternatively, a plurality of protrusions are densely distributed on the inclined surface 102A to increase the frictional force of the foreign matter contacting the inclined surface 102A with the inclined surface 102A, so that the foreign matter is more easily adhered to the inclined surface 102A by means of the frictional force to be rapidly discharged along the inclined surface 102A.

Because the end face of the dynamic seal ring 2 or the end face of the static seal ring 4 both need to meet the requirement of higher roughness so as to achieve the general finish of a mirror surface, the friction force when the dynamic seal ring 2 rotates relative to the static seal ring 4 is reduced. Therefore, during machining, it is often necessary to further grind the end face of the dynamic seal ring 2 and the end face of the static seal ring 4 separately, whereas in fig. 1, since the rim 102 integrally formed with the static seal ring 4 does not extend axially beyond the seal interface 9, the tool for grinding the end face of the static seal ring 4 will not be affected at all by the rim 102 integrally formed with the static seal ring 4.

Still in further detail, it can also be observed in fig. 1 that the rotating ring seat 1 comprises a front section with a first outer diameter and a rear section with a second outer diameter, the first outer diameter being greater than the second outer diameter. The exemplary sealing arrangement further comprises a bushing 32 having a third outer diameter, the second outer diameter being larger than the third outer diameter, the bushing 32 extending backwards integrally with the moving ring mount 1 or being connected to the moving ring mount 1 as a separate component to pack the moving ring mount 1, the moving seal ring 2, the stationary seal ring 4, the stationary ring mount 5, and the spring 6 together to form a cartridge mechanical seal.

The inner peripheral surface of the front section of the rotating ring base 1 is connected to the rotating shaft 100 by means of the O-ring 12.

Due to the difference in the outer diameters of the front and rear sections of the moving ring seat 1, and of the rear section of the sleeve 32, the moving ring seat 1 forms a stepped surface for seating the moving seal ring 2, the moving seal ring 2 being correspondingly shaped complementary to said surface, i.e. the moving seal ring 2 comprises a front section of a first inner diameter and a rear section of a second inner diameter, the first inner diameter being greater than the second inner diameter. The inner peripheral surface of the front section of the dynamic seal ring 2 is connected to the boss 32 by means of another O-ring 13. The presence of the O- rings 12, 13 contributes to the heat dissipation of the dynamic sealing ring 2.

In the cartridge type mechanical seal, the rotating ring is previously assembled with respect to the stationary ring, the sleeve 32 extends all the way through the stationary ring seat 5 to the outside of the apparatus casing 101, and an axial clearance is formed with respect to the inner peripheral surface of the stationary ring seat 5 so as not to prevent the rotating ring from rotating together with the rotating shaft 100.

Then, a locking ring 15 is fitted around the sleeve 32, the locking ring 15 being positioned axially and radially with respect to the stationary ring by means of a plurality of positioning blocks 16 (typically three), the positioning blocks 16 being fastened to the rear end face of the stationary ring seat 5 by means of bolts 17 passing axially through each positioning block 16. Then, the rotating shaft 100 is inserted into the assembled moving and stationary rings, and one or more fastening screws (not shown) may be radially screwed into the locking ring 15 and through the sleeve 32, thereby fastening the assembled moving and stationary rings to the rotating shaft 100. Then, the positioning blocks 16 may be removed from the rear end surface of the stationary ring base 5.

Optionally, a portion of the dynamic seal ring 2 adjacent to the sealing interface 9 forms a beveled chamfer 103 that is inclined away from the sealing interface 9, i.e., the bevel is reversedThe angle 103 is inclined upwardly and forwardly to an extent substantially equal to the starting point a₁And end point B₁The extent of the inclination of the connecting line between them to form a uniform inclined space for impurities to leave the sealing interface 9. In this way, the end surface of the dynamic seal ring 2 and the end surface of the static seal ring 4 are also set to be substantially flush. In order to reduce the friction when the dynamic seal ring 2 rotates relative to the static seal ring 4, the end face of the static seal ring 4 is truncated on the side where the seal interface contacts the air, so as to reduce the area of the seal interface 9.

The stationary ring seat 5 may also be provided with a flushing hole 19, via which one end of the flushing hole 19 may be in fluid communication with the interior of the device housing, due to the spacing of the outer circumferential surface of the stationary sealing ring 4 relative to the outer circumferential surface of the annular groove 14. If necessary, washing water without impurities may be filled through the other end of the washing hole 19 to wash the sealing device. If the rotating device is working, the pressure of the flushing water will be greater than the pressure of the liquid medium in the housing.

In the embodiment with reference to fig. 3 and the details of which can be seen in fig. 4, the only difference with respect to the embodiment of fig. 1 and 2 described above is that the skirt 202 is formed integrally with the dynamic seal ring 2. Said skirt 202 extends radially away from the sealing interface 9 as it is axially close to the sealing interface 9, so that the cross section of the skirt 202, which is integral with the moving seal ring 2, is higher than the cross section of the static seal ring 4, and so that a portion of one of the static seal ring 4 and the moving seal ring 2 abuts the other of the static seal ring 4 and the moving seal ring 2.

In fig. 4, the starting point a of the inclined surface 202A₂And the point of attachment C₂Spaced apart by a distance and terminating at a point B₂Does not exceed the joint point C along the axial direction₂. End point B₂Is the highest point of the section projecting in the liquid medium. Starting point A₂And end point B₂The line between faces the joint point C₂And (4) inclining. Starting point A₂And the point of attachment C₂The line between is configured as an arc. Therefore, the tool for grinding the end face of the dynamic seal ring 2 will not be affected at all by the peripheral edge 202 integrally formed with the dynamic seal ring 2 during machining.

In the case where the skirt 202 is formed integrally with the dynamic seal ring 2, a portion of the static seal ring 4 close to the seal interface 9 forms a chamfer 203 inclined away from the seal interface 9, that is, the chamfer 203 is inclined upward and rearward to a degree substantially equal to the degree to which the inclined surface 202A is inclined, so as to form a uniform inclined space for facilitating the escape of foreign substances from the seal interface 9.

The skirt may be formed integrally with the stationary seat 5, separately or in combination, in addition to being formed integrally with the dynamic seal ring 2 or the stationary seal ring 4. Specifically, in fig. 1, the skirt 302 extends from the front end face of the stationary ring seat 5, radially away from the seal interface 9 as approaching the seal interface 9 in the axial direction. At least a portion of the skirt 302 is formed with an inclined surface 302A inclined with respect to the sealing interface 9 on a side close to the sealing interface 9. At the same time, the edge 302 abuts against the inner wall surface of the equipment housing 101 perpendicular to the rear wall surface on the side away from the sealing interface 9, and the edge 302 of the stationary ring seat 5 helps to correctly position the stationary ring seat 5 with respect to the equipment housing 101 when the stationary ring seat 5 is installed, in addition to stirring the impurities in the flowing liquid medium. Of course, the rim 302 of the stationary ring seat 5 does not extend axially beyond the sealing interface 9.

In the embodiment seen in fig. 5, the skirt 402 is integrally formed with the moving ring seat 1 and is disposed immediately adjacent to the sealing interface 9. The difference from the embodiment in fig. 1 to 4 is that the cross-sectional shapes of the moving ring seat 1 and the moving seal ring 2 are changed, the first outer diameter of the front section and the second outer diameter of the rear section of the moving ring seat 1 integrally formed with the skirt 402 become progressively larger from the front to the rear to form a tapered cylinder shape, and an annular groove 21 for receiving the front section of the moving seal ring 2 is provided in the rear section of the moving ring seat 1. Correspondingly, the rear section of the dynamic seal ring 2 becomes larger in outer diameter than the front section of the dynamic seal ring 2 to complement the dynamic ring seat. The outer circumferential surface of the front section of the moving seal ring 2 is connected to the moving ring seat 1 by means of an O-ring 13'.

The skirt 402 extends from the outer peripheral surface of the moving ring seat 1, radially away from the sealing interface 9, axially close to the sealing interface 9, wherein at least a portion of the skirt 402 is axially seated in the rear region of the moving seal ring 2On the segment to form an inclined surface 402A inclined towards the sealing interface 9. Starting point A of inclined surface 402A₃And the point of attachment C₃Spaced apart by a distance and terminating at a point B₃Does not exceed the joint point C along the axial direction₃. End point B₃Is the highest point of the section projecting in the liquid medium. The side of the skirt 402 remote from the sealing interface 9 forms a rearwardly and upwardly inclined surface along the entire outer peripheral surface of the moving ring seat 1. The skirt 402 of the moving ring seat 1 does not extend axially beyond the sealing interface 9, so that the structure of the sealing device remains compact, in particular in the axial direction.

In the embodiment according to fig. 6, the difference from the embodiment according to fig. 5 is that a cylindrical or annular additional part 22 is detachably mounted on the side of the moving ring seat 1 axially opposite to the side supporting the moving seal ring 2, for example, a number of fastening screws 23 are screwed axially into the additional part 22 and through the front section of the moving ring seat 1, so that the additional part 22 is fastened to the front section of the moving ring seat 1. Optionally, the front section of the moving ring mount 1 is provided with an additional step so that an additional part 22 can be seated on the front section of the moving ring mount 1. The additional component 22 is specially used for arranging the surrounding edge 502 and is easy to replace, and can be additionally arranged on the movable ring base 1 without greatly modifying the structure of the original movable ring base 1. In fig. 6, the skirt 502 is spaced from the dynamic seal ring 2 by a distance, and it is evident that the starting point a of the inclined surface 502A₄And the point of attachment C₄Spaced apart by a distance and terminating at a point B₄Does not exceed the joint point C along the axial direction₄. End point B₄Is the highest point of the section projecting in the liquid medium. In this case, the generatrix of the outer circumferential surface of the rotating ring holder 1 is parallel to the axial direction or at an angle.

In both embodiments, see fig. 7 and 8, the rims 602, 702 are still integrally formed with the moving ring seat 1, except that the locking ring 15 is no longer used to fix the moving ring seat 1 to the rotating shaft 100, but rather several fastening screws are used to screw directly in the radial direction into the front section of the moving ring seat 1, thereby fastening the moving ring seat 1 to the rotating shaft 100, in other words, the exemplary sealing arrangement is of a split type. However, this does not affect the design of the skirt. As shown in FIG. 7, the skirt 602 may be driven from the ringThe seat 1 is projected to be seated on the outer peripheral surface of the dynamic seal ring 2, the starting point A of the inclined surface 502A₅And end point B₅Spaced apart by a distance and terminating at a point B₅Does not exceed the joint point C along the axial direction₅. As shown in fig. 8, the skirt 702 may also extend from the dynamic seal ring seat 1 and be spaced apart from the dynamic seal ring 2, obviously, the starting point a of the inclined surface 702A₆And the point of attachment C₆Spaced apart by a distance and terminating at a point B₆Does not exceed the joint point C along the axial direction₆. Therefore, the application scene of the edge is very flexible.

The skirt formed integrally with the moving seal ring 2 and/or the moving seat 1 also acts as a barrier to at least partially block impurities flowing with the flowing liquid medium towards the sealing interface 9.

In the embodiment of fig. 1 to 4, the inner peripheral surface of the rear end portion of the stationary seal ring 4 is connected to the stationary ring seat 5 by means of the O-ring 11, and the O-ring 20 is provided between the front end surface of the stationary ring seat 5 and the rear wall surface of the apparatus housing 101. In contrast, in the embodiment of fig. 5 to 8, the outer peripheral surface of the rear end portion of the stationary seal ring 4 is connected to the stationary ring seat 5 by means of the O-ring 11 ', and the seal gasket 20' is provided between the stationary ring seat 5 and the rear wall surface of the apparatus casing 101. These are merely illustrative examples of various configurations of the sealing device and do not affect the function of the skirt.

In the embodiment of fig. 1 to 8, the liquid medium in the device case 101 is sealed by the outer peripheral surfaces of the stationary seal ring 4, the movable seal ring 2, and the movable ring seat 1, and the movable ring may be said to be located in the device case 101. In the embodiment shown in fig. 9, the dynamic ring is changed from being located inside the device casing 101 to being located outside the device casing 101, and therefore, the liquid medium inside the device casing 101 is sealed by the inner peripheral surfaces of the dynamic seal ring 2, the static seal ring 4, and the static ring seat 5. In this case, the skirt 802 will be integrally formed with one of the dynamic seal ring 2 and the static seal ring 4.

In the embodiment of fig. 1 to 8, the rims 102, 202, 302, 402, 502, 602, 702 are only arranged outside the sealing interface 9, that is, radially further away from the rotating shaft 100. Whereas in the embodiment of fig. 9, the skirt802 are only provided on the inner side of the sealing interface 9, that is, radially closer to the rotating shaft 100. At least a portion of the skirt 802 is shaped with a point of engagement C₇An inclined surface 802A, the inclined surface 802A comprising in cross-section close to the point of abutment C₇Starting point A of₇And away from the point of application C₇End point B of₇Starting point A₇And the point of attachment C₇Spaced apart by a distance and terminating at a point B₇Does not exceed the joint point C along the axial direction₇. End point B₇Is the highest point of the cross-section that protrudes into the liquid medium.

Although some specific embodiments of the present invention have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only, and not for the purpose of limiting the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (11)

1. A mechanical sealing device for liquid, for sealing a rotating shaft (100) passing through an apparatus casing (101) to prevent a liquid medium in the apparatus casing (101) from leaking, comprising:

the sealing device comprises a movable ring seat (1), a movable sealing ring (2), a static sealing ring (4) and a static ring seat (5) which are arranged around a rotating shaft (100), wherein the movable ring seat (1) is fastened on the rotating shaft (100) and supports the movable sealing ring (2), the static ring seat (5) is fastened on an equipment shell (101) and supports the static sealing ring (4), the end face of the movable sealing ring (2) is attached to the end face of the static sealing ring (4) by means of a spring (6) to form a sealing interface (9) perpendicular to the axial direction, and the sealing interface (9) comprises attachment points which are in contact with a liquid medium on the axial section; and

the annular is enclosed along, enclose along around moving sealing ring (2) and quiet sealing ring (4) in order to be used for stirring liquid medium, at least partly be formed with towards the inclined surface in laminating point slope on enclosing along, inclined surface is including being close to the initial point in laminating point and keeping away from the termination point in laminating point on axial cross section, and initial point and laminating point separate one section distance and termination point do not surpass laminating point along the axial.

2. Mechanical sealing device for liquids, according to claim 1, characterized in that said skirt is integrally formed with one of the static sealing ring (4) and the dynamic sealing ring (2) in such a way that the section of one of the static sealing ring (4) and the dynamic sealing ring (2) is higher than the section of the other of the static sealing ring (4) and the dynamic sealing ring (2) and in such a way that a portion of one of the static sealing ring (4) and the dynamic sealing ring (2) is in abutment with the other of the static sealing ring (4) and the dynamic sealing ring (2).

3. Mechanical sealing device for liquids according to claim 1, characterized in that said peripheral edge is formed integrally with the moving ring seat (1) and wherein said peripheral edge protrudes from the moving ring seat (1) to sit on the outer peripheral surface of the moving sealing ring (2); or wherein the skirt extends from the movable ring seat (1) and is spaced apart from the movable sealing ring (2).

4. Mechanical sealing device for liquids according to claim 1 or 2, characterized in that the peripheral edge is formed integrally with the stationary ring seat (5) and that the side of the peripheral edge facing away from the abutment point is arranged to abut against the inner wall surface of the device housing (101).

5. The mechanical liquid seal device according to claim 1 or 3, further comprising a cylindrical or annular additional member (22), wherein the peripheral edge is integrally formed with the additional member (22), the additional member (22) is detachably mounted on a side of the movable ring seat (1) axially opposite to a side supporting the movable seal ring (2), and a generatrix of an outer peripheral surface of the movable ring seat (1) is parallel to or forms an angle with the axial direction.

6. A mechanical sealing device for liquids according to any of claims 1 to 3, characterized in that the moving sealing ring (2) is connected to the outer or inner peripheral surface of the moving ring seat (1) by means of an O-ring and the static sealing ring (4) is connected to the outer or inner peripheral surface of the static ring seat (5) by means of a further O-ring.

7. A mechanical liquid seal according to any of claims 1 to 3 wherein the inclined surface comprises at least one of a straight surface, an arcuate surface, a corrugated surface.

8. A mechanical liquid seal according to any of claims 1 to 3 wherein an axial cross-section of said envelope is configured to include at least one of a cone, a polygon, and an arc.

9. A mechanical sealing device for liquids according to any of claims 1 to 3, characterized in that said skirt is provided only on the outside of the sealing interface (9), or alternatively said skirt is provided only on the inside of the sealing interface (9).

10. A mechanical sealing device for liquids according to any of claims 1 to 3, characterized in that the dynamic sealing ring (2) and the static sealing ring (4) are each of a one-piece or a split construction.

11. A mechanical liquid seal apparatus according to any one of claims 1 to 3, further comprising: a gland connected to the stationary ring seat (5); and the shaft sleeve (32) is sleeved on the rotating shaft (100), the shaft sleeve (32) and the movable ring seat (1) integrally extend or are connected to the movable ring seat (1) as an independent component, so that the movable ring seat (1), the movable sealing ring (2), the static sealing ring (4), the static ring seat (5) and the spring (6) are assembled together to form an integrated mechanical seal.

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