JPS6235173A - Sealing device for fluid equipment - Google Patents

Abstract

PURPOSE:To obtain a surely sealing function, by providing an elastic member, which continually urges a packing gland to the side of a gland packing, to be interposed between the packing gland and a packing gland structure. CONSTITUTION:A sealing device provides a gland packing 3 to be interposed between a stuffing box 1 and a spindle 2 and retained by a packing gland 4. An elastic member 6 is mounted to said packing gland, and if the packing gland 4 is pressed in the axial center direction by a packing gland structure 5, the packing gland 4 is pressed to a side of the gland packing 3 by tightening force of the packing gland structure 5 and urging force of the elastic member 6. In this way, the gland packing 3 is closely attached to the spindle 2 and the internal peripheral surface of the stuffing box 1. As a result, the device always presses the gland packing 3, even if it generates moderation of stress, by urging force of the elastic member 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a sealing device for a fluid device that is used in a fluid control device and prevents leakage from a gland packing.

(Prior Art) Generally, as a sealing device for a fluid device that prevents leakage from around a spindle, a structure using a gland packing is known.

That is, as shown in FIG. 2, the sealing device includes a packing box 11 of the housing 10, a spindle 12 inserted therein, a gland packing 13 interposed between the packing box Ill and the spindle 12, and a gland. It consists of a packing holder 14 that presses the packing 13 in the axial direction, and a packing holding nut 15 that is screwed onto the packing box 11 and presses the packing holder 14 toward the gland packing 13.

Then, when the packing presser nut 15 is screwed onto the packing box 11, the gland packing 13 is attached to the packing presser 1.
4, it is compressed in the axial direction, expands in the radial direction, and comes into close contact with the inner peripheral surfaces of the spindle 12 and the packing box 11, and exhibits a good sealing function. In the figure, 16 is a stopper, 17 is a fitting ring, 18 is a panel nut, 19 is a handle wheel, and 20 is a nut.

However, when the gland packing 13 is used in the sealing device, stress relaxation occurs in the gland packing 13 over time, and the gland packing 13 and the spindle 12
There is a problem in that the surface pressure between the ground gasket 13 and the inner circumferential surface of the gasket box 11 decreases, and fluid leaks from each of the locations, significantly impairing the functionality of the device.

(Problems to be Solved by the Invention) The present invention was devised to solve the above problems, and its purpose is to obtain a good and reliable sealing function even if stress relaxation occurs in the gland packing. The present invention provides a sealing device for fluid equipment.

(Means for Solving the Problems) The sealing device for fluid equipment of the present invention includes a packing box of a housing,
The spindle inserted through this, the gland packing interposed between the packing box and the spindle, the packing presser fitted onto the spindle and pressing the gland packing in the axial direction, and the packing presser fixed to the packing box. In a sealing device for a fluid device comprising a packing holder that presses toward the rough land packing, an elastic body is interposed between the packing holder and the packing holder to constantly urge the packing holder toward the ground packing. There is something special about what you did.

(Function) A gland packing is interposed between the packing box and the spindle, and this is pressed down with a packing presser, an elastic body is placed on the packing presser, and the packing presser is pushed in the axial direction with the packing presser. The tightening force of the packing holder and the force of the elastic body suppress the packing holder toward the gland packing side. As a result, the gland packing is compressed, expands in the radial direction, and comes into close contact with the spindle and the inner peripheral surface of the packing box. As a result, even if stress relaxation occurs in the gland packing, the packing presser always presses the gland packing due to the urging force of the elastic body, so that a good and reliable sealing function is exhibited.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a vertical cross-sectional view of a sealing device for fluid equipment showing an embodiment of the present invention, in which 1 is a packing box, 2 is a spindle, and 3 is a sealing device for fluid equipment.
4 is a gland packing, 4 is a packing presser, 5 is a packing presser body, and 6 is an elastic body.

- The packing box 1 is provided on the upper part of the housing 7, has a cylindrical shape, and has a male screw formed on its outer peripheral surface.

The spindle 2 is provided with a plug at its lower end,
It is inserted into the packing box 1 so that it can be moved up and down.

A fitting ring 8 and a gland packing 3 are interposed between the packing box 1 and the spindle 2, respectively.

The packing holder 4 has a substantially cylindrical shape and is provided with a recess 9 on its upper surface, the lower end of which is fitted between the packing box 1 and the spindle 2, and the lower end surface is brought into contact with the gland packing 3. It is externally fitted onto the spindle 2 in this state.

The packing presser body 5 is fixed to the packing box 1 to press the packing presser 4 toward the gland packing 3 side. That is, in this embodiment, a bag nut-shaped packing nut is used as the packing presser body 5, and by fitting this nut onto the spindle 2 and screwing it onto the packing box 1, the packing presser is formed. 4 can be pressed toward the gland packing 3 side.

An elastic body 6 is interposed between the packing presser 4 and the packing presser body 5 to constantly urge the packing presser 4 toward the gland packing 3 side. A disc spring is used as the elastic body 6, and the disc spring is placed in the recess 9 of the packing holder 40.

The height of the disc spring is set so that it protrudes upward from the upper end surface of the packing presser 4 when the spring is placed in the recess 9.

Then, a gland punch 3 is interposed between the packing box 1 and the spindle 2, and this is pressed by the packing presser 4, and an elastic body 6 is placed in the recess 9 of the packing presser 40 to hold the packing presser 5. When screwed into the packing box 1, the packing presser 4 is pressed toward the gland packing 3 by the force of the elastic body 6 and the tightening force of the packing presser 5.

As a result, the gland packing 3 is compressed in the axial direction, expands in the radial direction, and comes into close contact with the spindle 2 and the inner peripheral surface of the packing box 1.

In the above embodiment, a disc spring was used as the elastic body 6, but the elastic body 6 is not limited to the above embodiment. The shape and structure are arbitrary as long as it can bias the packing presser 4 toward the gland packing 3 side.

Further, in the above embodiment, only one disc spring was interposed between the packing presser 4 and the packing presser body 5, but in other embodiments, a plurality of disc springs were stacked and interposed. You can also set it up.

Further, in the above embodiment, a cap nut-shaped packing holding nut was used as the packing holding body 5, but in other embodiments, the packing holding body 5 was made into a 7-lung shape, and this was replaced with a bolt. It may be fixed to the packing box 1 with a nut.

(Effects of the Invention) As described above, the sealing device for fluid equipment of the present invention has an elastic body interposed between the packing holder and the hankin holder, which constantly urges the packing holder toward the gland packing. The force applied by the elastic body and the tightening force of the gland packing presser presses the gland packing toward the gland packing, thereby strongly compressing the gland packing. As a result, the contact pressure between the spindle and the inner circumferential surface of the packing box and the gland packing increases, and the sealing effect can be enhanced.

In addition, even if stress relaxation occurs in the gland packing, the packing holder always presses the gland packing due to the force of the elastic body, which prevents a drop in the contact surface pressure between the gland packing and each member, ensuring a good sealing function at all times. Able to demonstrate

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a sealing device for a fluid device showing an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of a needle valve equipped with a conventional sealing device. 1 is a packing box, 2 is a spindle, 3 is a ground packing, 4 is a packing presser, 5 is a packing presser, and 6 is an elastic body. Figure 1 1 = Packing box 2 Nissin spindle Figure 2

Claims (1)

[Claims] A packing box (1) of the housing, a spindle (2) inserted into this, a gland packing (3) interposed between the packing box (1) and the spindle (2), and a spindle (2). A packing holder (4) is fitted onto the outside of the gland and presses the gland packing (3) in the axial direction, and a packing holder (4) is fixed to the packing box (1) to hold the gland packing (3).
In a fluid equipment sealing device comprising a packing holder (5) that presses the packing holder (5) to the side, the packing holder (4) is always placed between the packing holder (4) and the gland packing (5). 3) A sealing device for a fluid device characterized by interposing an elastic body (6) that urges the side.