JPH0686911B2 - End seal integrated shaft seal device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end-seal integrated shaft sealing device used in fluid devices such as fluid machinery and fluid equipment.

BACKGROUND ART A shaft sealing device used in this type of fluid device is disclosed in Japanese Patent Publication No.
No. 57864 and Japanese Patent Publication No. 63-25227, the former uses a split end seal,
And because it makes it easy to replace the end seal,
The drive ring and seal sleeve are structurally complicated, and in the latter case, the structure that injects water on the seal side is adopted and the sealing performance is improved, so the entire device is complicated and large, and in some cases Some needed a water injection system.

The object and problem of the present invention are to allow the irregular movement of the shaft and reduce the irregular movement of the shaft between the sliding surfaces to stabilize the contact state between the sliding surfaces. The purpose of the present invention is to provide an end-seal-integrated shaft sealing device that secures a sealed state for a long period of time, simplifies the structure, and facilitates manufacturing, mounting, and inspection / maintenance.

SUMMARY OF THE INVENTION FOR OBJECTS AND PROBLEMS In accordance with the above objects and problems, an end seal integrated shaft sealing device of the present invention includes a stuffing box formed in a housing of a fluid device. A drive that is fixed in place on a shaft that extends outward through
A cone-shaped seal that has a ring and a tapered sliding surface that faces the stuffing box, is fitted to the shaft in a floating state with a ring seal interposed, and is non-rotatably connected to the drive ring. An abutment sleeve having a ring and a flange fixed to the end surface of the stuffing box and fitted into the stuffing box under a seal, and the shaft between the seal ring and the abutment sleeve And is locked around the abutment sleeve, and
A front plate having a plurality of spring pockets which are opened at appropriate intervals in the circumferential direction facing the flange of the abutment sleeve, and a seal fitted on the front plate around the shaft thereof. An end seal pressed against the tapered sliding surface of the ring and a floating fit on the shaft and abutment sleeve, axially movably fitted to the abutment sleeve under the seal, and its front A sealing sleeve screwed to the plate to lock the end seal to the front plate and a spring pocket between the flange of the abutment sleeve and the front plate, and the front・ Through the plate Its seal the end seal
A seal ring, a front plate, and a seal sleeve floating on the shaft, which includes a plurality of compression springs that press against the tapered sliding surface of the ring, maintain contact between the sliding surfaces. It is to stabilize and ensure a sealed condition and to simplify the structure by placing a compression spring between its front plate and the abutment sleeve.

Description of Specific Examples Specific examples of the end-seal integrated shaft sealing device of the present invention will be described below with reference to the drawings.

The figure shows a tenth embodiment of the end seal integrated shaft seal device of the present invention which is applied to the water pump 50.

The shaft seal device 10 includes a drive ring 11, a cone-shaped seal ring 12, an abutment sleeve 13, a front plate 14, an integral end seal 15, a seal sleeve 16 and three pieces. It was manufactured including the compression spring 17.

The drive ring 11 includes a stuffing box 52 formed in a housing 51 of the water pump 50.
At a predetermined position of the shaft 53 extending outwardly through the shaft 53, it is fixed to the shaft 53 with a set screw 21 screwed into the screw hole 20 and is rotated integrally with the shaft 53, and at the same time, receives thrust. I am trying to get it.

In addition, the drive ring 11 is a drive pin protruding toward the stuffing box 52 side.
Equipped with 22.

The cone-shaped seal ring 12 is made of silicon carbide (SiC)
Manufactured from, the inner diameter of the shaft bore 23 is
It is formed larger than the outer diameter of 53, and is fitted to the shaft 53 in a floating state with the ring seal 27 interposed.

The seal ring 12 forms a tapered sliding surface 24 on the ring surface facing the stuffing box 52, and at the ring surface facing the drive ring 11, an annular ring is formed at the opening edge of the shaft bore 23. Insertion step 25
Forming its ring seal or O-ring 27
Was processed into a shape that can be received in the fitting step 25.

Further, the seal ring 12 has a recess 26 cut out in the ring surface facing the drive ring 11.
Of course, the recess 26 is notched in the ring surface of the seal ring 12 at a position facing the drive pin 22, and is fitted to the shaft 53 with the O ring 27 interposed. Accept the tip of its drive pin 22 and, as such, its drive ring
It is non-rotatably connected to the shaft 11, and is placed in a floating state with respect to the shaft 53 so as to rotate integrally with the shaft 53.

The abutment sleeve 13 includes a sleeve body 28 and a flange integrally formed at one end of the sleeve body 28.
29, the sleeve body 28 is inserted into the stuffing box 52 and fitted together, and the gap between the sleeve body 28 and the stuffing box 52 is sealed with a liquid gasket (not shown). It was fixed to the end of the stuffing box.

Further, the flange 29 is provided with two fool holes 30 at equal intervals in the circumferential direction, and when the sleeve body 28 is inserted into the stuffing box 52, the flange 29 is stuffed into the stuffing box. Attached to the end surface of 52, the bolt 55 is screwed into the screw hole 54 of the stuffing box through the boss hole 30 and tightened to the end surface of the stuffing box 52.

In that way, the flange 29 is tightened with the bolt 55 to the end surface of the stuffing box 52,
The abutment sleeve 13 is fixed to the stuffing box 52.

Further, the flange 29 has three screw holes 31 formed in the flange surface at equal intervals in the circumferential direction in relation to the two fool holes 30.

So its flange with three screw holes 31 drilled
29 is a temporary bolt (not shown) that is screwed into the screw hole 31, the front plate 14, the end seal
It is used as a means for pre-assembling 15, the seal sleeve 16 and the compression spring 17 to the abutment sleeve 13 and also to the spring seat of the compression spring 17.

The front plate 14 has its shaft 53 between its seal ring 12 and its abutment sleeve 13.
Made into a ring plate that is placed around the and that faces the flange 29 of the abutment sleeve 13.

Further, the front plate 14 is formed on the plate surface on the side facing the flange 29 of the abutment sleeve 13 so as to be aligned with the two screw holes 31 formed in the flange 29 of the abutment sleeve 13. The spring pockets 32 are opened at equal intervals in the circumferential direction, and the three fool holes 33 are provided in the corresponding three spring pockets.
The seal ring is coaxially connected to the pocket 32.
In the circumferential direction, two U-shaped cutouts 34 are formed in the outer peripheral portion in relation to the three spring pockets 32 so that the plate surface on the side facing 12 is opened and can be fitted with the bolt 55. Notched at equal intervals.

Further, as can be seen from the figure, the front plate 14 is such that the seal ring side of the inner peripheral surface is processed into a taper surface 35, and the end seal 15 is fitted into the taper surface 35, and the cone Hold the end seal 15 in the state where it is retained on the side of the seal ring 12 and thread on the abutment sleeve side of its inner peripheral surface to screw the abutment sleeve side of its inner peripheral surface. It has been processed into hole 36.

The head plate 56 of the bolt 55 that fixes the flange 29 of the abutment sleeve 13 to the end surface of the stuffing box 52 is fitted into the U-shaped notch 34 of the front plate 14 thus manufactured. In the set state as shown, the abutment sleeve 13 or, in other words, the stuffing box 52 is prevented from rotating.

The end seal 15 was molded from carbon to the cross-sectional shape shown. That is, the end seal 15 is formed as an integral structure, and is provided with a tapered outer peripheral surface 37 so as to be so-called fitted so as to be complementarily fitted to the tapered surface 35 of the front plate 14. It was constructed around the shaft 53 and fitted into the tapered surface 35 of the front plate 14.

With such a structure, the end seal 15 is
It is fitted into the tapered surface 35 of the front plate 14,
Then, when the seal sleeve 16 is screwed into the screw hole 36 of the front plate 14, the front sleeve 14
It is clamped between the plate 14 and its sealing sleeve 16 and fixed to its front plate 14.

The end seal 15 thus retained on the front plate 14 comprises, as can be seen from the figures, an annular cross-section edge 38 of axial cross-section, which initially tapers the cone-shaped seal ring 12. From the time of contacting the sliding surface 24, the tapered sliding surface 24 is contacted while forming a tight sealing surface, and the wear limit is widened. That is, the end seal 15 is provided with such an annular edge 38, so that a large amount of wear can be obtained and the life of itself is lengthened.

The seal sleeve 16 is composed of a sleeve body 39 and a head 40 integrally formed at one end of the sleeve body 39, and an annular groove 41 is formed on the outer peripheral surface of the other end of the sleeve body 39. An O-ring 43 is fitted in the annular groove 41, and a screw 42 is provided on the outer peripheral surface of the head 40.
Cut the head 40 to the front plate 14
It can be screwed into the screw hole 36 of.

The seal sleeve 16 so produced has its head 40 attached to its front face after fitting its end seal 15 into the tapered face 35 of its front plate 14.
Screw it into the screw hole 36 of the plate 14 and tighten it to push its end seal 15 against the end face of its head 40 to prevent it from slipping out of its front plate 14 and thus its front plate The shaft 53 and its abutment
In a floating state between the shaft 53 and the abutment sleeve 13 between the sleeve 13 and the sleeve 13, the abutment sleeve 13 is axially movably fitted under a seal.

The three compression springs 17 are coil springs and are fitted in the spring pockets 32 of the front plate 14 between the flange 29 of the abutment sleeve 13 and the front plate 14.

The compression spring 17 thus fitted into the spring pocket 32 is fitted into the abutment sleeve.
As it tries to extend against the flange 29 of 13, the compression spring 17 presses its end seal 15 through its front plate 14 against the tapered sliding surface 24 of its seal ring 12 and its seal. • Keep the ring 12 and its end seal 15 in contact.

Next, the case where the shaft sealing device 10 manufactured in the above-described structure is attached to the water pump 50 will be described. In advance, the end seal 15 is the front plate.
14 is fitted into the taper surface 35 of the 14 and then the head 40 of the seal ring 16 is screwed into the screw hole of the front plate 14.
The seal sleeve 16 is assembled to the front plate 14 while tightening the end seal 15 to the front plate 14 by tightening the end seal 15 to the front plate 14, and further, the compression spring 17 is attached to the front plate 14.
Into the spring pocket 32 of the abutment sleeve 13 until its compression spring 17 is compressed by the flange 29 of the abutment sleeve 13 as shown.
Fit it into the sleeve body 39 of the sleeve 16, and then
The tack bolts are screwed into the threaded holes 30 of the flange 29 of the abutment sleeve 13 through the boss holes 33 of the front plate 14 so that the abutment sleeve 13, the front plate 14 and the integrated end seal 1
5, the seal sleeve 16 and the compression spring 17 are integrally assembled.

As such, its abutment sleeve 13, front plate 14, end seal 15, seal sleeve 1
Since 6 and the compression spring 17 are integrally assembled, first, the liquid gasket is applied around the sleeve body 28 of the abutment sleeve 13.
Then, while inserting the shaft through the seal sleeve 16 and the end seal 15, the sleeve body 28 of the abutment sleeve 13 is inserted into the stuffing box 52.

Next, replace the stud 30 in the flange 29 of the abutment sleeve 13 with the screw hole 54 in the stuffing box 52.
When the holes are aligned in this way, the U-shaped notch 34 of the front plate 14 can also be aligned with the screw hole 54 of the stuffing box 52, so that the bolt 55 can be screwed into the screw hole 54. tighten.

As such, when the bolt 55 is tightened into the threaded hole 54, the flange 29 of the abutment sleeve 13 is
Are tightened while attached to the end surface of the stuffing box 52, resulting in their abutment sleeve 13, front plate 14 and integral end
Seal 15, seal sleeve 16, and compression spring
17, its stuffing around its shaft 53
Attached to box 52.

The seal ring 12 is then fitted onto the shaft 53 so that the tapered sliding surface 24 contacts the annular edge 38 of the end seal 15 and the O-ring 27 around the shaft 53. Are fitted into the annular fitting step 25 of the seal ring 12, and the seal ring 12 is supported on the shaft 53 in a floating state.

Then, by inserting the drive pin 22 into the recess 26 of the seal ring 12, until the drive ring 11 contacts the ring surface of the seal ring 12.
Is fitted to the shaft 53, and at that position, the set screw 21 is tightened to fix the drive ring 11 to the shaft 53.

As such, once the drive ring 11 is secured on the shaft 53 to receive the seal ring 12, loosen the tack bolt, and rid the front plate 14 of It is pulled out from the screw hole 33 of the flange 29 of the abutment sleeve 13 through the hole.

As such, when the temporary bolts are removed, the shaft seal device 10 causes the stuffing of the water pump 50 to
Easy to attach to box 52. In particular, as can be seen from the described installation procedure, this shaft seal device 10
Since it has an external mounting structure, the installation work is very easy, and on top of that, it can be installed on a standard pump as it is.

Convenience and Benefits of the Invention As will be appreciated from the foregoing, the end seal integral shaft seal device of the present invention provides a predetermined shaft extension that extends outwardly through a stuffing box formed in the housing of the fluid device. Has a drive ring that is fixed at the position, and a tapered sliding surface that faces the stuffing box, is fitted to the shaft in a floating state with a ring seal interposed, and
An abutment sleeve that has a cone-shaped seal ring that is non-rotatably connected to the drive ring and a flange that is fixed to the end surface of the stuffing box, and is fitted to the stuffing box under the seal, and the seal -Around the shaft between the ring and the abutment sleeve and secured against the abutment sleeve, and open at an appropriate circumferential spacing facing the flange of the abutment sleeve. Multiple springs
A front plate with pockets, an end seal around its shaft that fits into the front plate and presses against the tapered sliding surface of its seal ring, its shaft and abutment
In the floating state on the sleeve, the abatement
A sealing sleeve axially movably fitted under the seal and then threadedly coupled to the front plate to lock the end seal to the front plate and a flange of the abutment sleeve. And a plurality of compression springs that fit into the spring pockets between the front plate and the front plate and press the end seals through the front plates against the tapered sliding surface of the seal ring. However, in the end seal integrated shaft seal device of the present invention, the integrated end seal becomes usable, and the irregular movement of the shaft is
Absorbed by the seal ring and seal sleeve that are placed on the shaft in a floating state, the irregular movement of the shaft is reduced between the sliding surfaces of the seal ring and the end seal, The contact between the moving surfaces is stable, and the optimum sealing is ensured for a long period of time.In addition, the external structure simplifies the entire structure structurally, avoids device failure, and makes it a standard pump. It can be installed as it is,
Further, the means for injecting a liquid, for example, water is omitted, wear of the shaft and seal sleeve of the fluid device is avoided, and inspection and maintenance are omitted for a long period of time, which is very useful for the fluid device. Be practical.

Relationship between the Invention and Specific Examples As described above, from the specific examples of the present invention described with reference to the drawings, various design modifications can be made to those having ordinary knowledge in the technical field to which the present invention belongs. And changes are easily made, and moreover, the content of the present invention is essential for the establishment of an invention that accomplishes the subject of the invention, and is derived from the technical essence of the invention, which is the nature of the invention. And then it is easily replaced by an objectively recognized embodiment.

[Brief description of drawings]

The drawing is an axial cross-sectional view of a specific example of the shaft seal device with an integrated end seal of the present invention applied to a water pump. 11 …… Drive ring, 12 …… Cone-shaped seal ring, 13 …… Abutment sleeve, 14 …… Front
Plate, 15 ... Integrated end seal, 16 ... Seal sleeve, 17 ... Compression spring.

Claims (1)

[Claims] 1. A drive ring fixed in position on a shaft extending outwardly through a stuffing box formed in a housing of a fluidic device, and a tapered slide facing the stuffing box. A cone-shaped seal ring that has a face, is fitted to the shaft in a floating state through a ring seal, and is non-rotatably connected to the drive ring, and is fixed to the end face of the stuffing box. An abutment sleeve having a flange that fits into the stuffing box under a seal, and is positioned around the shaft between the seal ring and the abutment sleeve and is non-rotatable to the abutment sleeve. And that abatement three Front plate with a plurality of spring pockets that are open at appropriate intervals in the circumferential direction facing the flange of and a taper of the seal ring that fits around the shaft and fits in the front plate. End seal that is pressed against a sliding surface and is floatingly fitted onto the shaft and abutment sleeve, axially movably under seal, under the seal, and threadedly connected to the front plate A sealing sleeve to prevent the end seal from coming off the front plate and a spring pocket between the flange of the abutment sleeve and the front plate, and through the front plate. The end seal End seal integrated shaft seal device including a plurality of compression springs that press against the tapered sliding surface of the seal ring of.