JPH0517271U - Shaft seal device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a shaft sealing device in which a plurality of gland packings fitted in multiple layers have the same contact pressure acting on the stirring shaft surface to improve the sealing performance. A gland type shaft sealing device in which a plurality of gland packings are fitted in multiple layers in a space formed in a shaft penetrating portion of a stuffing box through which a stirring shaft penetrates and tightened with a pressing member is used. This is a shaft sealing device characterized in that a gland packing 8 fitted in a multi-layered manner in the space 6 is adapted to each position in the space by gradually expanding from the inner side toward the opening.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a gland type shaft sealing device provided in an agitator for agitating a liquid or a solid in a container.

[0002]

[Prior Art]

 In a stirrer that stirs a liquid or solid in a container, the stirring shaft penetrates the inside and outside of the container. A shaft seal device of a type according to the specifications of is provided.

As one type of the shaft sealing device, there is a gland type shaft sealing device.

FIG. 3 is a sectional view of a main part of a conventional gland type shaft sealing device.

In this gland type shaft seal device, a space 3 is formed in a shaft penetrating portion of a stuffing box 2 through which a stirring shaft 1 penetrates, and a plurality of gland packings 4 are fitted in the space 3 in a multi-layered manner. The structure is such that a spring force is applied from the space opening side and tightened by the pressing member 5 and packed in the space 3.

[0006]

[Problems to be solved by the device]

 By the way, when the stirrer is operated, the stirring shaft swings due to the lateral load generated by the stirring. Normally, this runout is about 0 to 1 mm, but the gland packing itself can only follow a vibration width of about 0.1 to 0.2 mm, so the above-mentioned conventional gland type shaft seal. The device is forced to tolerate a significant leak for gas. From this point of view, the gland type shaft sealing device has a usage limitation that it can only be applied to a low pressure container.

Further, in order to reduce gas leakage, the number of gland packings that are normally fitted in multiple layers is increased. However, the space in which the gland packing is fitted is from the inside to the opening. Since it is invariable, the tightening force from the holding member side is not uniform for each gland packing, and if it is moved away from the holding member to some extent or more, the tightening force will not work as shown in Fig. The contact pressure (stress) p acting on the stirring shaft surface due to the deformation gradually decreases, and the sealing performance deteriorates.

The present invention has been made in view of the above points, and improves the space formed in the shaft penetrating portion of the stuffing box through which the agitation shaft penetrates and makes it uniform for each gland packing to be fitted. It is an object of the present invention to provide a shaft sealing device capable of exerting a uniform sealing property under various tightening forces.

[0009]

[Means for Solving the Problems]

 The gist of the present invention for achieving the above-mentioned object is to form a space in a shaft penetrating portion of a stuffing box through which a stirring shaft penetrates, and install a plurality of gland packings in a multi-layered manner in the space. In the ground type shaft sealing device tightened with the pressing member from the space opening side, the space is gradually expanded from the inner depth toward the opening, and the gland packing fitted into the space in multiple layers The shaft sealing device is characterized by being adapted to each position.

[0010]

[Action]

 Since the space in which the gland packing is fitted has a shape that gradually expands from the inner back to the open mouth, a pressing member for a plurality of ground packings fitted to each position of the space in multiple layers. The tightening force due to is uniform for each gland packing, and the contact pressure acting on the agitation shaft surface due to the deformation due to tightening is the same, and uniform sealing performance is exhibited.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

The basic configuration of the shaft sealing device of the present invention is common to that of FIG. 3 described above, and common portions and equal portions will be described with the same reference numerals.

FIG. 1 is a sectional view of a main part of a shaft sealing device of the present invention.

In the present invention, the space 6 formed in the shaft penetrating portion of the stuffing box 2 through which the stirring shaft 1 penetrates is gradually expanded from the inner depth toward the opening, and the space on the stuffing box 2 side is expanded. The wall surface is a tapered wall 7.

The gland packing 8 fitted in a multi-layered manner in the space 6 configured as described above has various positions in the space 6, that is, the tapered wall 7 on the stuffing box 2 side and the stirring shaft 1 surface. The contact pressure (stress) p acting on the surface of the stirring shaft 1 due to the deformation caused by the tightening from the pressing member 5 is the same as that of each gland packing 8 as shown in FIG. is there.

[0016]

[Effect of the device]

 According to the present invention configured as described above, the clamping force from the pressing member side is made uniform with respect to the plurality of gland packings fitted in the space of the shaft penetrating portion of the stuffing box in multiple layers, and the stirring shaft surface is The same contact pressure that acts on each of the gland packings achieves a uniform sealing property to obtain a predetermined sealing property for the entire packing, but the number of packings used can be reduced compared to the conventional device, and the device size can be reduced. Will be promoted. Further, unlike the conventional case, the contact pressure locally acting on the stirring shaft surface is not increased to accelerate the wear, and the pressing force by the pressing member is set to be relatively small to obtain a predetermined sealing property. It has a practical effect such as extended service life.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a shaft sealing device of the present invention.

FIG. 2 is an explanatory view of the action of contact pressure acting on the stirring shaft surface.

FIG. 3 is a sectional view of a main part of a conventional gland type shaft sealing device.

FIG. 4 is an explanatory view of the action of contact pressure acting on the stirring shaft surface.

[Explanation of symbols]

 1 ... Stirring shaft 2 ... Stuffing box 3 ... Space 4 ... Ground packing 5 ... Holding member 6 ... Space 7 ... Tapered wall 8 ... Ground packing

Claims (1)

[Scope of utility model registration request] 1. A gland in which a space is formed in a shaft penetrating portion of a stuffing box through which a stirring shaft penetrates, and a plurality of gland packings are fitted in the space in a layered manner and tightened with a pressing member from the space opening port side. In the shaft seal device, the space is gradually expanded from the inner side toward the opening, and the ground packing fitted in the space in a layered manner is adapted to each position in the space. .