JP3084720U - Ring gland packing - Google Patents

Abstract

(57) [Problem] To manufacture a gland packing, a core material is coated with a coating material, and these pieces are cut into pieces, and both ends of the pieces are butt-joined. In some cases, minute gaps and voids are generated. For this reason, the durability of the gland packing may be reduced, or in extreme cases, the packing performance (sealability) itself may be adversely affected. SOLUTION: Joining part of core ring 14 and covering ring 1
5 are circumferentially offset from one another, in particular at the joint of the covering ring 15, forming an overlap 18. Therefore, a reliable tight connection state can be obtained, and the durability and the manufacturing efficiency can be improved, and the cost can be reduced.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a ring-shaped gland packing.

[0002]

[Prior art]

 Conventionally, as a ring-shaped gland packing, for example, those described in JP-A-2001-32944, JP-A-2866345, JP-A-2000-320681, and the like are known. Each of these gland packings is provided with a covering material or a polymer material provided along the longitudinal direction of the core material formed in a string shape, and this is cut into a predetermined length in a state in which both ends are cut off. The two ends were joined to a ring-shaped body by press-forming with the both ends abutting. In addition, expanded graphite is used for any of the core material, the coating material, and the polymer material, and the heat resistance and the wear resistance are mainly improved.

[0003]

[Problems to be solved by the invention]

 In the conventional gland packing, as described above, the core material and the covering material, or the core material and the polymer material are cut to a predetermined length, and the both ends are joined in a butt shape. However, in such a bonding state, it is difficult to obtain a reliable bonding state, and in some cases, a minute gap or a hole may be generated in the bonding portion. As a result, the durability of the gland packing may be reduced, and in extreme cases, the packing performance (sealability) itself may be adversely affected.

[0004] In the conventional gland packing, as a manufacturing method, there is a method including a procedure of winding up from a band-shaped material in a process of forming a core material, a covering material, and the like. This was often a bottleneck in increasing efficiency and reducing costs. The present invention has been made in view of the above circumstances, and provides a ring-shaped gland packing capable of improving durability as well as packing performance, and improving manufacturing efficiency and reducing costs. With the goal.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has taken the following measures. That is, the ring-shaped gland packing according to the present invention has a core ring and a covering ring. The core ring is formed in an endless shape by joining both ends of the core ring with a string-shaped core material. The covering ring shall be joined at the non-coincidence position with the joining position of both ends of the core ring by a tubular bag-shaped covering material extrapolated along the longitudinal direction of the core material of the core ring. It was formed by

[0006] As described above, the joints at both ends of the core material in the core ring and the joints at both ends of the covering material in the covering ring do not coincide in position. By doing so, the respective joinings can be reliably performed, and there is no danger of generating minute gaps or voids. In addition, since the structure has such a manufacturing procedure, it is not necessary to go through a procedure of “rolling up the material”, so that the manufacturing efficiency can be improved and the cost can be reduced.

[0007] The core material of the core ring can be formed of a material containing expanded graphite. In addition, the core material of the core ring may include a Teflon (registered trademark) component or a stainless steel component. If the core material of the core ring has a mountain-shaped cross section and is formed with the bottom side facing the inner circumference and the peak side facing the outer circumference, it is suitable for use in pipe joints and the like. It is preferable that the covering material of the covering ring is formed with a superimposed portion at a joint portion at both ends.

[0008] By doing so, more reliable bonding can be achieved. It is preferable that the covering material of the covering ring has a high sliding property. The covering material of the covering ring may be formed in a net bag shape. The ring-shaped gland packing according to the present invention can be used for a movable pipe joint. That is, the movable pipe joint includes a retainer externally fitted to the pipe body, a joint body operably attached to the retainer, and a joint between the retainer and the joint body during these operations. And a ring-shaped gland packing for maintaining the sealing performance over the entire circumferential range.

The ring-shaped gland packing according to the present invention can be suitably applied to a movable pipe joint used in a high-temperature environment.

[0010]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 show one embodiment of a ring-shaped gland packing 1 according to the present invention. The gland packing 1 is provided with a retainer 5 which is externally fitted to the tubular body 3 in a movable pipe joint 2 as shown in FIGS. 7 and 8, for example. It is used between the two and the joint body 6 which is freely assembled.

As shown in FIG. 2, the gland packing 1 has a cross-sectional mountain shape (trapezoidal or triangular shape), and is formed with the bottom side facing inward and the peak side facing outward. . Then, as shown in FIG. 3, the core material 10 has a cross-sectional structure surrounded by a covering material 11. As shown in FIG. 1, the core material 10 forms a core ring 14, and the coating material 11 forms a coating ring 15.

The core material 10 forming the core ring 14 is formed in a string shape. In the present embodiment, the core material 10 has a square cross section, and one side thereof is 10 mm. However, this is not limited at all, and may be, for example, a circular cross section or a strip, and its size can be appropriately changed as needed. The core 10 may be made of, for example, expanded graphite as a forming material. If necessary, a Teflon (registered trademark) component or a stainless steel component can be included. Expanded graphite has the property of expanding under high temperature to enhance the packing performance (sealability). Therefore, if it is used, this gland packing 1 is suitable for use in a high temperature environment.

It is also possible to use expanded graphite containing carbon fibers as a material for forming the core material 10. Further, one or more wires made of Inconel or the like may be embedded along the longitudinal direction of the core material 10. In order to form the core ring 14 using the core material 10, as shown in FIG. 5 (note that the relationship with the coating ring 15 is omitted here), both ends of the core material 10 are abutted. Bonding, which results in an endless form.

On the other hand, the covering material 11 forming the covering ring 15 is formed in a tubular bag shape that can be inserted outside the core material 10. In the present embodiment, a net-shaped tubular bag made of a material having high slip characteristics (for example, rock wool, carbon fiber, ceramic fiber, or metal wire such as Inconel or stainless steel) is used. The net structure was circular knitting. In order to form the covering ring 15 using the covering material 11, one end of the covering material 11 is placed inside the other end as shown in FIG. 6 (the relationship with the core ring 14 is omitted here). By inserting and overlapping both ends by a predetermined length α, the overlapping portion 18 is formed, thereby forming an endless shape.

When the length of the core material 10 is set to [L], the length of the coating material 11 needs to be [L + 2α] obtained by adding 2α required for forming the overlapping portion 18. Become. As is clear from FIG. 1, the joints at both ends of the core material 10 in the core ring 14 and the joints at both ends of the covering material 11 in the covered ring 15 do not coincide in position. By doing so, the respective joints can be reliably performed, and there is no possibility that minute gaps, voids, and the like are generated at the respective joints. In the present embodiment, the joint at both ends of the core material 10 in the core ring 14 and the joint at both ends of the coating material 11 in the coating ring 15 are shifted by about 180 ° in the circumferential direction. However, the circumferential shift angle is not limited at all. Further, the number of joints in the core ring 14 and the covering ring 15 is not limited to one, but may be increased to a plurality of places.

In order to manufacture the gland packing 1 having such a structure, first, as shown in FIG. 4, a coating material 11 for forming a coating ring 15 is extrapolated to a core material 10 for forming a core ring 14. However, in this case, the covering material 11 is inserted into the middle part of the core material 10 in the longitudinal direction. Then, the exposed end of the core 10 is inserted into the free end of the covering material 11 as it is. Then, at this time, the above-mentioned overlapping portion 18 is formed at the joining portion of the covering material 11 and is loaded into a molding die (not shown). After confirming the above, cold press molding is performed.

Needless to say, a concave shape (eg, a mountain cross section) required for the cross-sectional shape of the gland packing 1 may be formed as a forming concave portion of the forming die used at this time. If necessary, heating may be performed during molding. The product density (specific gravity) of the gland packing 1 manufactured in this manner can be set to 1.4 to 1.2. In addition to the above, the present invention can be appropriately changed according to the embodiment. For example, the cross-sectional shape of the gland packing 1 is not limited at all.

Further, its use is not limited at all. For example, as shown in FIG. 9, a joint body 6 is provided as an intermediate member as the movable pipe joint 2, and retainers 5 are arranged on both sides of the joint body 6. The gland packing 1 of the present invention can be used not only for itself but also for those which are components of the movable pipe joint 2. In the case of the movable pipe joint 2 shown in FIG. 9, two types of ring-shaped gland packings X and Y may be used between the joint body 6 and each of the retainers 5 in a Y-X-Y arrangement. At this time, it is common to use a gland packing X having a rich slipperiness and a gland packing Y having a rich sealing property.

Therefore, the gland packing 1 of the present invention described in the above embodiment is preferably applied to the gland packing X. In addition, the gland packing 1 of the present invention can be used in a part other than the movable pipe joint 1 (for example, a place where a lid is attached to a flange portion of a pipe end).

[0020]

[Effect of the invention]

 As is evident from the above description, the ring-shaped gland packing according to the present invention ensures that the joints of the core ring and the covering ring are in a tightly connected state, thereby improving the durability and the manufacturing efficiency. The cost can be reduced. Needless to say, high packing performance (sealability) can be obtained.

[Brief description of the drawings]

FIG. 1 is an overall view showing one embodiment of a gland packing according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of a portion B in FIG. 2;

FIG. 4 is a perspective view illustrating one process of manufacturing the gland packing of FIG. 1;

FIG. 5 is a perspective view of relevant parts for explaining a manufacturing process of the core ring in the gland packing of FIG. 1;

FIG. 6 is a perspective view of relevant parts for explaining a manufacturing process of the covering ring in the gland packing of FIG. 1;

7 is a partially broken side sectional view showing an example of a movable pipe joint that can use the gland packing of FIG. 1;

8 is a partially broken side sectional view showing another example of a movable pipe joint that can use the gland packing of FIG.

FIG. 9 is a partially broken side sectional view showing another example of the movable pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gland packing 2 Movable pipe joint 3 Tube 5 Retainer 6 Joint body 10 Core material 11 Coating material 14 Core ring 15 Coating ring 18 Overlapping part

Claims (10)

[Utility model registration claims] A core ring (1) formed into an endless body by joining both ends of a cord-shaped core material (10).
4) and a tubular bag-shaped covering material (1) extrapolated along the longitudinal direction of the core material (10) of the core ring (14).
A ring-shaped gland packing comprising a covering ring (15) formed by joining both ends of the core ring (14) at a non-coincidence position with a joining position of both ends according to 1). 2. Core material (10) of said core ring (14).
The ring-shaped gland packing according to claim 1, wherein the ring gland is formed of a material containing expanded graphite. 3. The ring-shaped gland packing according to claim 1, wherein the core member (10) of the core ring (14) contains a Teflon (registered trademark) component. 4. The ring-shaped gland packing according to claim 1, wherein the core member (10) of the core ring (14) contains a stainless steel component. 5. Core material (10) of said core ring (14).
5. The ring-shaped gland packing according to claim 1, wherein the ring-shaped gland packing has a mountain-shaped cross-section and is formed with the bottom side facing the inner circumference and the peak side facing the outer circumference. 6. 6. The covering material (1) of said covering ring (15).
The ring-shaped gland packing according to any one of claims 1 to 5, wherein in (1), an overlapping portion (18) is formed at a joining portion at both ends. 7. The coating material (1) of said coating ring (15).
The ring-shaped gland packing according to any one of claims 1 to 6, wherein 1) has a high slip property. 8. The covering material (1) of said covering ring (15).
The ring-shaped gland packing according to any one of claims 1 to 7, wherein 1) is formed in a net bag shape. 9. A retainer (5) externally fitted to the tubular body (3), a joint body (6) operably mounted on the retainer (5), and the retainer (5). It is used as a ring-shaped gland packing for a movable pipe joint (2) having a ring-shaped gland packing which maintains the sealing property during the operation between the two parts together with the joint body (6). The ring-shaped gland packing according to any one of claims 1 to 8, wherein: 10. The ring-shaped gland packing according to claim 9, wherein the movable pipe joint (2) is used in a high-temperature environment.