JPH1026258A - Shaft sealing device - Google Patents

Abstract

(57) [Summary] [Problem] To easily and quickly perform all the press-fitted laminated gland packing groups between the inner peripheral surface of a stuffing box and the outer peripheral surface of a shaft body without using a special tool. So that regular replacement can be performed with good workability. SOLUTION: An inner peripheral surface of a stuffing box 4 and a shaft body 2 are provided.
A ring-shaped packing seat 11 for receiving and supporting the gland packing group 5 which is stacked and inserted in the axial direction between the outer peripheral surface and the inner peripheral end of the stuffing box 4 and the packing seat. 11, a pull-out operation body 12 penetrated in the axial direction through the laminated gland packing group 5 in a state in which one end is fixed and the other end protrudes outward from the axially outer end opening of the stuffing box 4. The packing pull-out member 13 is provided.
3, an outwardly protruding end portion 12 of the pull-out operation body 12
a is held so as to be relatively displaceable in the axial direction with respect to the packing holding member 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal between a casing and a shaft passing through the casing, for example, to prevent fluid leakage from between a valve box and a valve shaft in a valve device. The present invention relates to a shaft sealing device that is applied for performing

[0002]

2. Description of the Related Art FIG. 7 is a longitudinal sectional view of a shaft sealing device conventionally generally used for preventing fluid leakage in a valve device, for example. A through-hole 3 is formed, and a stuffing box 4 is formed at the outer end of the through-hole 3 concentrically with the through-hole 3.
A plurality of gland packing groups 5 stacked in the axial direction are inserted between the inner peripheral surface of the stuffing box 4 and the outer peripheral surface of the valve shaft 2. Reference numeral 6 denotes a packing holding member fitted into the stuffing box 4. The packing holding member 6 is screwed to stud bolts 7, 7 which are fixedly projected outward from the axially outer end face of the valve box 1. When the nuts 8 are tightened, the nuts 8 move inward in the axial direction to press the laminated gland packing group 5 inward in the axial direction, and the pressing force causes the inner and outer peripheral surfaces of the laminated gland packing group 5 to be pressed. Is pressed against the outer peripheral surface of the valve shaft 2 and the inner peripheral surface of the stuffing box 4 to prevent fluid leakage from between the valve shaft 2 and the valve box 1. In addition,
In FIG. 7, reference numeral 9 denotes a bush that is fitted to the valve shaft 2 outside.

[0003]

In the shaft sealing device having the above-described structure, the inner peripheral surface of the stuffing box 4 of the laminated gland packing group 5 and the inner peripheral surface of the laminated gland packing group 5 are repeatedly formed by repeatedly rotating and axially moving the valve shaft 2. Since the sliding surface with the outer peripheral surface of the valve shaft 2 wears with time and the sealing performance deteriorates, it is necessary to periodically replace the laminated gland packing group 5.

However, in the conventional shaft sealing device having the above-described structure, the laminated gland packing group 5 receives a strong pressing force inward in the axial direction by the packing pressing member 6 to thereby control the valve shaft 2.
And a special tool is required to pull out the laminated gland packing group 5 for regular replacement, etc. However, even if a special tool is used, there is a problem in that it takes a lot of time and labor to extract all of the laminated gland packing group 5, which is a troublesome operation.

The present invention has been made in view of the above circumstances, and it is possible to easily and promptly remove all the laminated gland packing groups without using a special tool and perform periodic replacement with good workability. It is intended to provide a shaft sealing device that can be used.

[0006]

In order to achieve the above-mentioned object, a shaft sealing device according to the present invention is applicable to a casing having a through hole of a shaft and an outer peripheral portion of the shaft inserted through the through hole. A staffin box formed concentrically with the through hole in the casing, and a gland packing group inserted in an axially stacked state between an inner peripheral surface of the staphin box and an outer peripheral surface of the shaft body. And a packing holding member fitted in the stuffing box and pressing the laminated gland packing group inward in the axial direction, wherein the stuffing box is provided at an axially inner end of the stuffing box. And a ring-shaped packing seat for receiving and supporting the stacked gland packing group, one end of which is fixed to the packing seat, and the other end of which is defined by an axially outer end opening of the stuffing box. Also provided is a packing pulling-out member constituted by a pulling-out operating body that penetrates the laminated gland packing group in the axial direction so as to protrude outward, and an outwardly protruding end of the pulling-out operating body in the packing pulling-out member is provided. It is characterized in that it is inserted into the groove formed on the inner end side in the axial direction of the packing holding member so as to be relatively displaceable in the axial direction, and when periodically replacing the laminated gland packing group, After removing the packing holding member, the pull-out operation body of the packing pull-out member is nipped with a general-purpose tool and pulled out in the axial direction, so that a ring-shaped packing seat to which one end of the pull-out operation body is fixed. Through the body, all of the laminated gland packings received and supported by this are moved collectively outward in the axial direction It is possible to withdraw outwardly from the axially outer end opening of Inbokkusu,
The use of special tools is not required, and the entire stacked gland packing group can be easily and quickly extracted and replaced without any trouble.

Here, as the pull-out operation body in the packing pull-out member, a cylindrical operation body is used.
Even if a configuration in which a plurality of gland packing groups are double-layered on both the inner and outer peripheral surfaces is adopted, it is also possible to use a rod-shaped operating body to connect this to a radially intermediate portion of a single-layer laminated gland packing. May be adopted.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional front view of a shaft sealing device according to the present invention. In FIG. 1, the same components as those of the conventional example shown in FIG. 7 are denoted by the same reference numerals, and detailed description thereof is omitted. .

In FIG. 1, reference numeral 11 denotes a ring-shaped packing seat which is disposed at an axial inner end of the stuffing box 4 and receives and supports the laminated gland packing group 5;
As shown in FIG. 2, an axially outer end 12 a of the packing seat 11 protrudes outward from an axially outer end opening of the stuffing box 4. An inner end in the axial direction of a cylindrical pull-out operation body 12 having an axial length is fixed, and the cylindrical pull-out operation body 12 and the ring-shaped packing seat body 11 constitute a packing pull-out member 13. Have been.

The stacked gland packing group 5 includes a group of land packings 5A axially stacked on the inner peripheral side of the cylindrical pull-out operating member 12 of the packing pull-out member 13, and an outer peripheral side of the cylindrical pull-out operating member 12. And a group of land packings 5B stacked in the axial direction.

An annular groove 14 having an appropriate depth in the axial direction is formed on the inner end side of the packing holding member 6 in the axial direction, and a cylindrical shape of the packing pull-out member 13 is formed in the annular groove 14. The axially outer end portion 12a of the pull-out operation body 12 is inserted so as to be relatively displaceable in the axial direction so as to allow the packing pressing member 6 to press the laminated gland packing group 5.

In the shaft sealing device constructed as described above, an inner / outer double gland packing group laminated in the axial direction on the inner peripheral side and the outer peripheral side of the cylindrical pull-out operation body 12 in the packing pull-out member 13, respectively. 5A, 5B
Is inserted into the stuffing box 4 together with the packing pull-out member 13, and the packing holding member 6 is moved inward in the axial direction to press the stacked gland packing group 5 inward in the axial direction. Thereby, the inner peripheral surface and the outer peripheral surface of the laminated gland packing group 5 are brought into pressure contact with the outer peripheral surface of the valve shaft 2 and the inner peripheral surface of the stuffing box 4 so that the space between the valve shaft 2 and the valve box 1 is removed. It is used by being assembled in a predetermined sealing state for preventing fluid leakage.

The sliding surface of the laminated gland packing group 5 between the inner peripheral surface of the stuffing box 4 and the outer peripheral surface of the valve shaft 2 wears with time, and the sealing performance is reduced. At the time of periodic replacement of the gland packing group 5, the nuts 8, 8 are unthreaded from the stud bolts 7, 7, and the packing holding member 6 is removed, as shown in FIG.
In this case, the axially outer end 12a of the pull-out operating body 12 protrudes outward from the stuffing box 4, and the protruding axially outer end 12a of the pull-out operating body 12 is clamped by a general-purpose tool such as pliers. The pull-out operation is performed outward in the axial direction, whereby a ring-shaped packing seat 11 to which one end of the pull-out operation body 12 is fixed.
All of the laminated gland packing groups 5 received and supported by the staple box 4 can be collectively moved outward in the axial direction, and can be pulled out from the axially outer end opening of the stuffing box 4. As described above, even if a special tool is not used, the entire laminated gland packing group 5 can be easily and quickly extracted and replaced without any trouble.

FIG. 4 is a vertical sectional front view showing another embodiment of the shaft sealing device according to the present invention. In this embodiment, a shaft formed on the inner end side of the packing holding member 6 in the axial direction. While the locking pin 21 along the radial direction is fixed in the annular groove portion 14 having an appropriate depth in the direction, the cylindrical extraction member 12 of the packing extraction member 13 has
As shown in FIG. 2, the engaging portion 22 engaged with the locking pin 21 by rotating the packing press member 6 in the circumferential direction, and the locking pin 21 when the packing press member 6 presses the packing. Are formed with a pin guide hole 23 allowing relative displacement toward the engaging portion 22 side.

In the shaft sealing device having the structure shown in FIGS. 4 and 5, when the packing gland packing group 5 is pressed by the packing holding member 6, the packing holding member 6 is rotated to operate the locking pin. 21 can be engaged with the engaging portion 22 of the cylindrical pull-out operation body 12 in the packing pull-out member 13, and in this state, when the packing pressing member 6 is gripped and pulled out axially outward, The packing pulling-out member 13 moves axially outward integrally with the packing pressing member 6 via the engaging portion between the locking pin 21 and the engaging portion 22, whereby general-purpose tools such as pliers can be used. Without using it, all of the laminated gland packing group 5 can be extracted from the stuffing box 4.

In each of the above-described embodiments, the case where the pull-out operation body 12 of the packing pull-out member 13 is formed in a cylindrical shape is described. However, the present invention is not limited to this. For example, as shown in FIG. On the outer surface of the receiving body 11, one end is fixed at two places in the diameter direction,
A rod-shaped pull-out operation body 12A having an axial length such that the axial outer end portions 12a protrude outward from the axial outer end opening of the stuffing box 4 is provided.
12A may be used. In the case of the packing pull-out member 13 having the configuration using the rod-shaped pull-out operating bodies 12A, 12A, the packing pull-out member 13 is provided at the radially intermediate portion of the single-layer laminated gland packing group 5 in the radial direction. What is necessary is just to set it as the structure which penetrates the rod-shaped pull-out operation bodies 12A and 12A.

[0017]

As described above, according to the present invention, when the stacked gland packing group is periodically replaced, the packing gland is removed together with the stacked gland packing group and inserted into the stuffing box. By performing a simple work such as holding the pull-out operation body of the packing pull-out member with a general-purpose tool and pulling it out in the axial direction, one end of the pull-out operation body is fixed through a ring-shaped packing seat body. All of the stacked gland packing groups received and supported by the group can be collectively moved outward in the axial direction and can be pulled out from the axially outer end opening of the stuffing box. Therefore, it is not necessary to use a special tool, and the entire laminated gland packing group can be easily and quickly extracted without any trouble, thereby significantly improving workability such as periodic replacement of the laminated gland packing group. It has the effect of being able to do so.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a shaft sealing device according to the present invention.

FIG. 2 is a partially broken enlarged perspective view of a packing pull-out member in the shaft sealing device.

FIG. 3 is a vertical sectional front view showing a state when the packing is pulled out in the shaft sealing device.

FIG. 4 is a longitudinal sectional front view showing another embodiment of the shaft sealing device according to the present invention.

FIG. 5 is a partially broken enlarged perspective view of a packing pull-out member in the shaft sealing device.

FIG. 6 is an enlarged perspective view showing a modified example of the packing pull-out member in the shaft sealing device according to the present invention.

FIG. 7 is a vertical sectional front view of a conventional shaft sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve case (casing) 2 Valve shaft (shaft) 3 Through-hole 4 Stuffing box 5, 5A, 5B Laminated gland packing group 6 Packing holding member 11 Packing seat 12, 12A Packing pull-out operation body 13 Packing pull-out member 14 Annular groove

Claims (1)

[Claims] 1. A casing having a through hole for a shaft, a stuffing box formed concentrically with the through hole in the casing corresponding to an outer peripheral portion of the shaft inserted into the through hole, A gland packing group inserted in an axially laminated state between an inner peripheral surface of the fin box and an outer peripheral surface of the shaft body; and A ring-shaped packing seating member disposed at an axial inner end of the stuffing box for receiving and supporting the laminated gland packing group, One end is fixed to the packing seat, and the other end of the laminated gland packing penetrates in the axial direction such that the other end protrudes outward from the axially outer end opening of the stuffing box. A packing pulling-out member constituted by a pulling-out operating body to be provided, wherein an outwardly protruding end of the pulling-out operating body of the packing pulling-out member is axially inserted into a groove formed on an axially inner end side of the packing pressing member. A shaft sealing device which is inserted so as to be relatively displaceable in a direction.