JPH06201051A - Ring packing - Google Patents

Abstract

PURPOSE:To improve sealing performance by preventing the winding starting edge and winding ending edge of tape like packing base material, formed of expanded graphite, from the generation of such step difference as to form a leakage path. CONSTITUTION:Tape like packing base material 1 formed of expanded graphite is wound spirally in layers and pressurized from the width direction to form a ring packing. In this ring packing, the winding starting edge 1a and winding ending edge 1b of the packing base material are respectively formed into a three-dimensional rapture section leading to layer separation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-shaped packing used for a shaft sealing portion of a rotary machine or the like.

[0002]

2. Description of the Related Art As a packing of this type, there is conventionally known one in which a tape-shaped packing base material made of expanded graphite is molded into a ring shape. That is, as shown in FIG. 14, this is a tape-like packing base material 10 made of expanded graphite.
1. A simple substance of 1 or a tape-shaped reinforcing member (not shown) superposed on one side thereof is spirally wound with its one end side in the longitudinal direction being the inner peripheral side, and is wound in the width direction (axial direction). ) To form a ring.

[0003]

According to the conventional ring-shaped packing having the above-described structure, both ends in the thickness direction of the tape-shaped packing base material 101 are formed by a sharp tool or the like at both ends in the longitudinal direction. 2 cut at right angles to the plane
Since the packing base material 101 has a dimensional cross-section, the packing base material 101 is spirally wound and molded, as shown in FIG.
The winding start end 101a and the winding end end 101b
When a step 102 is formed on each of the shafts and is used by being loaded between the outer peripheral surface of the shaft and the inner peripheral surface of the stuffing box, the step 102 becomes a leakage path in the axial direction, which becomes a factor that deteriorates the sealing performance. Was there.

The present invention has been made in order to solve the above problems, and has a ring shape capable of improving the sealing property at the winding start end and winding end end of the tape-shaped packing base material. It is intended to provide packing.

[0005]

In order to achieve the above object, the ring-shaped packing according to the present invention of claim 1 is obtained by winding a tape-shaped packing base material made of expanded graphite in spiral contact with each other a plurality of times. , In a ring-shaped packing formed by pressure-molding this in the thickness and width directions, the winding start end and the winding end end of the tape-shaped packing base material, respectively,
It is formed on a three-dimensional fracture surface with delamination.

Further, the ring-shaped packing according to the present invention of claim 2 uses two tape-shaped packing base materials, except for at least one turn each of the winding start side and the winding end side of one packing base material. The other packing base material is polymerized and wound around the intermediate portion.

Furthermore, in the ring-shaped packing according to claim 1 or 2, at least one end in the width direction of the packing base material wound in a spiral shape is formed into a three-dimensional fracture surface, and the width thereof is formed. It is preferable that both ends in the direction are pressed in the width direction to form a complicated folded portion that overlaps in the radial direction.

[0008]

According to the present invention of claim 1, since the winding start end and the winding end end of the tape-shaped packing base material are formed in a three-dimensional fracture surface, the winding start end portion and the winding end end of the packing base material are formed. It is possible to make close contact with the inner peripheral surface and the outer peripheral surface of the spiral body without forming a step in the portion. Therefore, when used by being loaded between the outer peripheral surface of the shaft and the inner peripheral surface of the stuffing box, a leak path in the axial direction is not formed, and the sealing performance can be improved.

According to the second aspect of the present invention, of the two packing base materials, one packing base material has the other packing at an intermediate portion except at least one turn on the winding start side and the winding end side. Since the parts are polymerized and wrapped,
The other tape-shaped packing base material acts as a reinforcing material, counteracts changes in external pressure in the mounted state, and suppresses displacement of the tape-shaped packing base material.

Furthermore, at least one end in the width direction of the tape-like packing base material is formed into a three-dimensional fracture surface, and both ends in the width direction are pressed from the width direction so as to overlap in the radial direction. When forming in a complicated fold, the fold forms a laminate and covers the end face of the packing, and therefore, permeation leakage from the end face of the packing is prevented and the outer peripheral surface of the shaft and the stack are prevented. The protrusion in the axial direction is suppressed when the fin box is used by being mounted on the inner peripheral surface thereof.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a perspective view and a schematic half-longitudinal sectional view, respectively, showing a ring-shaped packing according to an embodiment of the present invention.

In FIGS. 1 and 2, reference numeral 1 denotes a tape-like packing base material 1 made of expanded graphite, which is wound a plurality of times in a spiral shape with one end 1a in the longitudinal direction being the inner peripheral side and closely wound. It is formed by pressure in the thickness and width directions (axial direction). Specifically, it is manufactured as follows.

First, the tape-shaped material 2 made of expanded graphite as shown in FIG. 3 is ruptured at regular intervals. At the time of rupture, both side surfaces 1c and 1d in the thickness direction of the tape-shaped material 2 are broken.
After the slits 3 and 4 for breaking are formed at predetermined positions of the tape by shifting their positions in the longitudinal direction, the tape material 2
As shown in FIG. 4, one side surface 1c is formed by applying a bending force or a shearing force to each of the two cut grooves 3 and 4 to break them.
A tape-like packing base material 1 having a three-dimensional fracture surface 1a (1b) that is inclined toward the other side surface 1d and causes delamination is produced.

Then, as shown in FIG. 5, the tape-like packing base material 1 has one end 1a side as an inner peripheral side, and is closely wound in a spiral shape a plurality of times so that the other end portion 1b is wound at the end end. A ring-shaped intermediate product is formed. The ring-shaped packing M as shown in FIGS. 1 and 2 is manufactured by press-molding the ring-shaped intermediate product in the thickness and width directions.

The ring-shaped packing M having such a structure
Since the winding start end 1a and the winding end end 1b of the tape-shaped packing base material 1 are formed in a three-dimensional fracture surface,
As shown in FIG. 6, the winding start end 1a and the winding end end 1b come into close contact with the inner peripheral surface and the outer peripheral surface of the spiral body in a gentle manner, and no step is generated. When used by being loaded between the fin box and the inner peripheral surface, no leak path is formed in the axial direction, and the sealing performance can be improved.

By the way, in the above embodiment, the ring-shaped packing M is constructed by using only one tape-shaped packing base material 1. However, as shown in FIG. Another tape-like packing base material 11 having the same width as or narrower than that of the base material 1 may be stacked and used. In this case, as shown in FIG. 8, at least one winding is wound around the winding start end 1a side of one tape-shaped packing base material 1, and then the other tape-shaped packing base material 11 is wound while being superposed on it. For at least one peripheral part, only the tape-like packing base material 1 of the one tape is wound again. Also in this embodiment, it is preferable that the winding start end 11a and the winding end end 11b of the other tape-shaped packing base material 11 have three-dimensional fracture surfaces. In the ring-shaped packing M having such a configuration, the other tape-shaped packing base material 11 acts as a reinforcing material against external force changes in the mounted state, and peeling between layers is prevented. Also,
In this case, it is preferable to use, as the other tape-like packing base material 11, one having a higher density than one.
Of course, the other tape-like packing base material 11 may be a flat-woven braid made of a metal net, but if it is made of expanded graphite like one, or if a material similar to it is used, one tape-like packing Familiarity with the packing base material 1 is good, the bonding properties of the both 1 and 11 are good, and a packing with further excellent sealing property is obtained.

The other tape-like packing base material 1 is used.
As shown in FIGS. 10 and 11, the net-like reinforcing material 12 having a width narrower than that of the tape-like packing base material 11
Etc. may be further overlapped.

In the tape-like packing base material 1, both end faces in the width direction may be formed into a three-dimensional fracture surface, and as shown in FIG. 12, both end parts 1e, 1f in the width direction are formed. 13 is compressed along the longitudinal direction to form a three-dimensional fracture surface, and both widthwise end portions 1e and 1f of the three-dimensional fracture surface are pressed from the width direction, as shown in FIG. Complex folding part 1 that overlaps along the
A configuration in which g and 1h are formed may be used. Particularly, in the case of a ring-shaped packing M formed by forming complicated folded portions 1g and 1h at both ends in the width direction as shown in FIG. 13, both ends in the width direction are laminated and both ends in the axial direction of the packing M. Since the surfaces are covered, it is possible to reliably prevent permeation leakage from these end surfaces, and also to suppress the protrusion in the width direction in the loaded and used state.

[0019]

As described above, according to the present invention of claim 1, a tape-like packing base material made of expanded graphite is spirally wound with a winding start end and a winding end end as a three-dimensional fracture surface. Since pressure is applied from the width direction, no step is formed between the winding start end and winding end end of the packing base material and the inner peripheral surface and outer peripheral surface of the spiral body.
The ends can be brought into close contact with the peripheral surface of the spiral body.
Therefore, when used by being loaded between the outer peripheral surface of the shaft and the inner peripheral surface of the stuffing box, a leak path in the axial direction is not formed, and the sealing performance can be significantly improved.

According to the second aspect of the present invention, of the two tape-shaped packing base materials, one packing base material is provided at an intermediate portion except at least one turn on the winding start side and the winding end side. Since another tape-shaped packing base material is polymerized and rolled up, the other tape-shaped packing base material can act as a reinforcing material to sufficiently counteract changes in external pressure in the mounted state. Delamination of the body can be prevented.

Further, according to a third aspect of the present invention, at least one end in the width direction of the tape-like packing base material is formed into a three-dimensional fracture surface, and both ends in the width direction are applied from the width direction. When forming by pressing to form a complicated folded part that overlaps in the radial direction, this folded part forms a laminate and covers the end surface of the packing, therefore preventing permeation leakage from the packing end surface and sealing. Further, it is possible to further improve the property, and it is possible to suppress the protrusion in the axial direction when it is used by being loaded between the outer peripheral surface of the shaft and the inner peripheral surface of the stuffing box.

[Brief description of drawings]

FIG. 1 is a perspective view showing a ring-shaped packing according to an embodiment of the present invention.

FIG. 2 is a schematic semi-longitudinal sectional view of a ring-shaped packing in the embodiment.

FIG. 3 is a perspective view showing an example of processing the end face of the tape-shaped material used for the ring-shaped packing in the same embodiment.

FIG. 4 is a perspective view showing an end face in the longitudinal direction of a tape-shaped packing base material used for the ring-shaped packing in the example.

FIG. 5 is a perspective view of the tape-shaped packing base material used for the ring-shaped packing in the same embodiment in the middle of forming the packing base material into a spiral shape.

FIG. 6 is a plan view showing a main part of a ring-shaped packing according to the embodiment.

FIG. 7 is a perspective view showing two tape-shaped packing base materials.

FIG. 8 is a schematic view showing a state in which two tape-shaped packing base materials are rolled up.

9 is a schematic half-longitudinal sectional view showing a ring-shaped packing made using the tape-shaped packing base material of FIG. 7. FIG.

FIG. 10 is a perspective view showing a state in which a reinforcing member is provided on one of the two tape-shaped packing base materials.

11 is a schematic half-longitudinal sectional view showing a ring-shaped packing made using the tape-shaped packing base material of FIG.

FIG. 12 is a perspective view showing a modified structure of the tape-shaped packing base material.

FIG. 13 is a schematic semi-longitudinal sectional view showing a modified example of the ring-shaped packing.

FIG. 14 is a perspective view showing a conventional ring-shaped packing.

FIG. 15 is a plan view of an essential part showing a conventional ring-shaped packing.

[Explanation of symbols]

 1,11 Tape-like packing base material 1a Winding start end 1b Winding end end 1g, 1h Folding part

Claims (3)

[Claims] 1. A ring-shaped packing obtained by closely winding a tape-shaped packing base material made of expanded graphite a plurality of times in a spiral shape, and press-molding the roll-shaped packing base material in the thickness and width directions. A ring-shaped packing characterized in that a winding start end and a winding end end of a material are each formed into a three-dimensional fracture surface accompanied by delamination. 2. A tape-shaped packing base material is used, and the other tape-shaped packing base material is provided at an intermediate portion of at least one winding start side and a winding end side of one packing base material except for one turn. Ring-shaped packing that is polymerized and rolled up. 3. The packing base material wound in a spiral shape has at least one end in the width direction formed into a three-dimensional fracture surface, and both ends in the width direction are pressed from the width direction to obtain a diameter. The ring-shaped packing according to claim 1 or 2, which is formed by forming a complicated folded portion that overlaps in the direction.