JP3270952B2 - Shaft sealing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft sealing device which seals a shaft by sliding sliding rings arranged on a stationary side and a rotating side close to each other at end faces facing each other in the axial direction. In particular, the present invention relates to a sliding ring having a structure divided in a circumferential direction.

[0002]

2. Description of the Related Art Some fluid equipment such as industrial pumps, water turbines and compressors are extremely difficult to disassemble and assemble when they are large-sized. Therefore, the shaft sealing device mounted on such a device has a structure in which some or all of the components are circumferentially divided for the purpose of reducing the labor required for disassembling and assembling the device during maintenance. It is common to do.

FIGS. 4 and 5 show a typical conventional example of this type of shaft sealing device, wherein reference numeral 1 denotes a housing of the device, and 2 denotes a rotating shaft. The shaft sealing device 3 includes a pair of sliding rings 31 and 3 in which a plurality of arc-shaped pieces are combined in an annular shape.
2 Among them, one stationary side sliding ring 31
Is incorporated in a circumferential groove 33a extending in the circumferential direction of the retainer 33 on the stationary side, which is held by the housing 1 via the packing 34 so as to be movable in the axial direction and is prevented from rotating by the pin 35, and The sliding ring 32 is
The stationary side sliding ring 31 is incorporated in a circumferential groove 36a extending in a circumferential direction of a rotating side retainer 36 fixed to a collar 37 on an outer periphery of the retainer 3 via a bolt 38.
By being axially pressed by a spring (not shown) through a shaft 3, the spring is hermetically slidably contacted with a rotating side sliding ring 32 rotating together with the rotating shaft 2, and seals the shaft between the housing 1 and the rotating shaft 2. Do. Further, a housing 1 and a retainer 3
3, 36 and the collar 37 are also divided at a plurality of positions in the circumferential direction similarly to the sliding rings 31, 32.
Each is annularly connected via a bolt.

[0004] Sliding rings 31, 3 divided in the circumferential direction
2 is to fix the gap between the circumferential grooves 33a, 36a of the retainers 33, 36 as small as possible using appropriate fixing means and to fix the circumferential grooves 33a, 36a of the retainers 33, 36.
Dowel pins 38, 39 protruding from each other and each sliding ring 31,
Engagement with the notches 31a, 32a formed in the 32 prevents relative rotation with the retainers 33, 37, respectively, or is fixed by filling the gap with an adhesive.

[0005]

The following problems are pointed out in the conventional shaft sealing device. (1) The arc-shaped pieces of the sliding rings 31 and 32 are illustrated in order to be inserted in the circumferential grooves 33a and 36a of the retainers 33 and 36 in the axial direction while aligning the notches 31a and 32a on the back with the knock pins 38 and 39. In the process of completely assembling to the state shown in FIG.
The arcuate pieces of the sliding ring 32 easily fall off, and the falling off causes the sealing sliding surfaces S, which are the sliding contact portions of the sliding rings 31 and 32 to each other.
May be damaged. (2) In order to prevent the above-mentioned falling off, it is conceivable to provide a fastening means such as a bolt for fastening each piece of the sliding rings 31, 32 to the circumferential grooves 33a, 36a. In the above, a small distortion is generated on the sealing sliding surface S by the tightening force of the fixing means, and the distortion may impair the closeness of each other, resulting in a large amount of leakage. (3) When the sliding rings 31, 32 are fixed with an adhesive,
When replacing with a new sliding ring, the old sliding ring cannot be easily removed from the peripheral grooves 33a, 36a, and a complicated operation such as removal of the adhesive solidified in the peripheral grooves 33a, 36a is required. .

Accordingly, a main object of the present invention is to stably assemble a sliding ring having a structure divided in a circumferential direction without falling off from a circumferential groove of a retainer and to easily replace the sliding ring. Is to do.

[0007]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, in the shaft sealing device according to the present invention, the radial width between the opposing peripheral surfaces is partially reduced in the peripheral groove formed to extend in the circumferential direction on the opposing end surfaces of the respective retainers to hold the sliding ring. restraint portion is formed, it said its radial width in the sliding ring restrained segment extending circumferentially for mating with the restraining portion narrowed in part is formed, divided surface and the said sliding ring Retain
When the notches corresponding to each other are formed in the
In addition, a locking member intervenes between both notches.
It was a thing. Preferably, the lock member is detachably fixed to the one notch.

[0008]

The sliding ring is retained by being inserted into the circumferential groove of the retainer from the divided portion of the retainer in the circumferential direction, and the restrained portion formed on the sliding ring is formed in the circumferential groove. Since the engaging portion is engaged with the restraining portion, the sliding ring is prevented from coming off in the axial direction from the circumferential groove even before the assembly as the shaft sealing device, and the fragment of the sliding ring and the fragment of the retainer are integrally formed. Can handle. The rotation stop of the sliding ring with respect to the retainer is achieved by engagement of a notch formed on the dividing surface of the sliding ring and the dividing surface of the retainer with a lock member interposed between both notches. Done. Further, after the sliding ring is inserted into the circumferential groove, the lock member is fixed to, for example, a notch of the retainer, thereby preventing the sliding ring from coming out of the circumferential groove in the circumferential direction.

[0009]

FIG. 1 shows a preferred embodiment of a shaft sealing device according to the present invention.
Is a rotation axis. The housing 1 is divided into two parts in the circumferential direction, and the divided part is also divided into two parts in the circumferential direction by a flange 11 connected via a plurality of bolts 12 and a gasket (not shown). Seal case 13 which is connected via a bolt 14 and a gasket (not shown) and has an inner diameter smaller than the inner diameter of the flange 11.
Are connected in the axial direction through bolts 15 and 16 and packings 17 and 18.

The shaft sealing device 10 of the present embodiment for sealing the space between the housing 1 and the rotating shaft 2 includes a stationary side and a ring in which two semi-circular sliding ring segments made of, for example, SiC are combined. A pair of rotating side sliding rings 101, 1
02. The seal case 13 of the housing 1 includes
A stationary retainer 103 made of metal is supported movably in the axial direction via a packing 104 slidably in contact with its inner peripheral surface, and a collar 10 fixed to the sleeve 21 of the rotating shaft 2 is provided.
6, a rotating side retainer 105 axially opposed to the stationary side retainer 103 is fixed via a packing 107 and a bolt 108. These retainers 103 and 105
And the collar 106 are each divided into two semicircular arc-shaped pieces in the circumferential direction, and are connected in a ring shape by connecting means such as bolts (not shown). Each retainer 10
3 and 105 are formed with circumferential grooves 103a and 105a extending in the circumferential direction at opposite ends thereof, and the stationary-side sliding ring 101 is connected to the peripheral groove 103a of the stationary-side retainer 103.
In addition, the rotating slide ring 102 is connected to the rotating retainer 10.
5 are respectively incorporated in the peripheral grooves 105a.

A plurality of holes 13a are formed at equal intervals in a circumferential direction on an end face of the seal case 13 of the housing 1 facing the stationary side retainer 103, and a coil spring 109 is disposed in each of the holes 13a. . The stationary-side retainer 103 has an outer diameter flange portion pressed and urged in the axial direction by the coil spring 109 and is prevented from rotating with respect to the housing 1 by a pin (not shown). Side retainer 103
Is axially urged through the shaft, so that the rotating side sliding ring 102 and its facing end surfaces are in close contact with each other.

The circumferential groove 103 of each of the retainers 103 and 105
As shown in FIG. 2, radial widths of the circumferential grooves 103a and 105a are set on the inner peripheral side of the retainers 103 and 105a.
Constraining portions 110, 1 formed with outer peripheral tapered surfaces 110a, 111a that gradually narrow toward the opposite end surfaces of the respective 105.
11 are formed. On the other hand, sliding rings 101 and 10
2 are formed on both inner surfaces of the sliding rings 10 corresponding to the outer tapered surfaces 110a and 111a of the restraining portions 110 and 111.
Tapered constrained portions 112 and 113 for gradually narrowing the radial width of 1, 102 toward the sealing sliding surface S are formed, and are fitted to the outer peripheral tapered surfaces 110a, 111a.

As also shown in the perspective view of FIG. 3, divided surfaces 101a, 102a at both ends in the circumferential direction of semicircular arc-shaped fragments (hereinafter, referred to as sliding ring fragments) 101A, 102A of the sliding rings 101, 102. Are formed with notches 114 and 115 facing the surface (back surface) opposite to the sealing sliding surface S. On the other hand, the semicircular arc-shaped fragments (hereinafter referred to as “retainer fragments”) 103A and 105A of the retainers 103 and 105 have circumferential grooves 103 at divided surfaces 103b and 105b at both ends in the circumferential direction.
Notches 116 and 117 facing the bottom surfaces of the a and 105a are formed. Notch 11 on retainer 103, 105 side
Locking members 118 and 119 are fixed to the fixing members 6 and 117 via screw members 120 and 121. The distal ends 118a and 119a of the locking members 118 and 119 are fixed to the circumferential grooves 1 and 119, respectively.
03a, 105a, the sliding rings 101, 10 held by
Notch 11 of sliding ring fragments 101A and 102A
4 and 115 in a loosely fitted state. The reference numerals 122 and 123 in FIG.
A and 105A are screw holes to be screwed with screw members (not shown) for annularly connecting the respective members.

In this embodiment, the sliding ring piece 10
1A and 102A are circumferential grooves 103a and 105a of the retainer pieces 103A and 105A, respectively, as indicated by a thick arrow A in FIG.
And is inserted by being inserted in the circumferential direction from the divided surfaces 103b and 105b. After assembling, the lock members 118, 119 are fixed to the cutouts 116, 117 of the retainer fragments 103A, 105A, and the tips 118a, 1
19a engages notches 114, 115 at the circumferential ends of the sliding ring pieces 101A, 102A. In this state, the sliding ring fragments 101A and 102A are prevented from coming out of the circumferential grooves 103a and 105a in the axial direction by fitting of the restrained portions 112 and 113 and the restraining portions 110 and 111, and the locking members 118 and 102A. Since engagement with 119 prevents the circumferential grooves 103a and 105a from coming off in the circumferential direction, they can be handled as one piece with the retainer pieces 103A and 105A.

In the use state shown in FIG. 1, a non-rotating sliding ring 101 supported on the housing 1 side is provided.
The sliding ring 102 that rotates together with the rotating shaft 2 receives a slip torque due to friction on the sealing sliding surface S, but is engaged by the locking members 118 and 119 and the cutouts 114 and 115 so that the sliding rings 101 and 102 can be rotated. Is the retainer 103,
The relative rotation with respect to 105 is prevented.

When the sliding rings 101 and 102 need to be replaced due to the progress of wear of the sliding surface S with time, the retainers 103 and
After separating 105 into retainer pieces 103A and 105A, respectively, the fixing of locking members 118 and 119 by screw members 120 and 121 is released. Thereby, the sliding ring fragments 101A, 10A of the sliding rings 101, 102
2A can be easily pulled out from the circumferential grooves 103a and 105a in the circumferential direction.

In the above embodiment, the sliding rings 101 and 102, the retainers 103 and 105, the collar 1
06 has been described as being divided into two parts in the circumferential direction,
The number of divisions is not particularly limited. In addition, the restraining portions 110 and 111 and the restrained portions 112 and 1
Reference numeral 13 does not need to be tapered, and may be, for example, a step surface extending in the circumferential direction. In addition, the sliding ring 10
Depending on the material and size of the lock members 1, 102,
8 and 119 can be fixed to the cutouts 114 and 115 on the sliding rings 101 and 102, and can be engaged with the cutouts 116 and 117 on the retainers 103 and 105.

[0018]

According to the present invention, the following effects are realized. (1) The sliding ring fragment held in the circumferential groove of the retainer fragment can be handled integrally with the retainer fragment even before the assembly of the shaft sealing device around the shaft of the equipment. The sliding surface can be prevented from being damaged due to the sliding ring falling off. (2) Since the sliding ring fragments are not prevented from falling off from the circumferential groove by fastening means such as bolts,
An increase in leakage due to distortion of the sealing sliding surface can be prevented. (3) The sliding ring fragment is inserted into the circumferential groove of the retainer fragment by inserting it in the circumferential direction, and the detachment in the circumferential direction is prevented by the detachable locking member. Easy removal and installation work.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a preferred embodiment of a shaft sealing device according to the present invention by cutting along a plane passing through an axis.

FIG. 2 is a sectional view showing the above embodiment in a partially enlarged manner.

FIG. 3 is a partial exploded perspective view of the embodiment.

FIG. 4 is a half sectional view showing an example of a conventional shaft sealing device cut along a plane passing through an axis.

FIG. 5 is a perspective view showing a divided shape of a sliding ring used in a conventional shaft sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Rotating shaft 10 Shaft sealing device 101,102 Sliding ring 101A, 102A Sliding ring fragment 103,105 Retainer 103A, 105A Retainer fragment 103a, 105a Circumferential groove 110,111 Restricted part 112,113 Restricted part 114-117 Notch 118, 119 Lock member

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toru Sogabe 1500, Katayanagi, Oaza, Sakado, Saitama Prefecture Inside the Saitama Plant (72) Inventor Hiroshi Aoike 1500, Katayanagi, Sakado, Saitama, Japan Eagle Industry Co., Ltd. (56) References JP-A-64-80773 (JP, A) JP-A-4-185976 (JP, A) JP-A-62-180173 (JP, A) JP-A-56-80559 (JP, A) A) JP-A-5-302675 (JP, A) JP-A-6-59668 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16J 15/34

Claims (2)

(57) [Claims] 1. A are combined annularly while being divided in the circumferential direction a plurality of locations, and a pair of sliding rings which are sealingly sliding contact with each other at end surfaces facing each other in the axial direction, divided in the circumferential direction a plurality of locations And a pair of retainers arranged on the stationary side and the rotation side in a state of being coupled in an annular manner, wherein each of the sliding rings is formed to extend in the circumferential direction on the mutually facing end surfaces of each of the retainers. In the shaft sealing device held in the circumferential groove, a restraining portion in which the radial width between the opposing circumferential surfaces is partially narrowed is formed in the circumferential groove, and the radial width is partially narrowed in the sliding ring. A constrained portion extending in the circumferential direction to be fitted with the constrained portion is formed.
And the split surface of the slide ring and the split surface of the retainer
Corresponding notches are formed, and both cuts are
A shaft sealing device, wherein a lock member is interposed across the notch . 2. The locking device according to claim 1, wherein the lock member has a notch formed on a retainer side and a slide ring side.
A shaft sealing device, which is detachably fixed to one of them .