JPS6113065A - Gland packing - Google Patents

Abstract

PURPOSE:To markedly prolong the life of a garter spring by forming a shallow groove crossing from the inner peripheral-surface side to the outer peripheral- surface side onto the upper surface of each divided piece. CONSTITUTION:A shallow groove 130 crossing from the inner peripheral-surface side 180 to the outer peripheral-surface side 170 is formed onto the upper surface 1101 of a divided piece 110. The compressed gas is supplied from the upstream side into the gap between the slidable surface 180 of the divided piece 110. Since the gas reaches directly onto the outer peripheral surface 170, passing through the shallow groove 130 on the upper surface 1101 of the divided piece 110, the gas pressure applied onto the slidable surface 180 between the divided pieces 110 and 111 and the gas pressure applied onto the outer peripheral surfaces 170 and 171 are balanced. Therefore, the press-spreading movement and the pressing-in movement of the divided pieces 110 and 111 due to the gas pressure difference are not generated, and the frequent extension and contraction of a garter spring 3 is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Field of Industrial Application The present invention relates to a gland packing that can extend the life of a garter spring that tightens the outer periphery of a split type gland packing.

(2) Conventional technology: During use, the hooks at both ends of the garter spring that tighten the outer circumference of the split-type gland packing are damaged and the connection becomes disconnected, making it impossible to seal the shaft, which can lead to unexpected accidents. There was a risk of causing

(3) Problems to be solved by the invention As a result of intensive research into the cause of this problem, the present inventor found that in the case of one division type gland packing (taking the example of 6-division type gland packing 10). As shown in Figure 1,
The compressed gas coming from the upstream side enters the gap 44 between the piston rod 7 and the gland packing 10 through the gap 41 between the piston rod 7 and the gland packing 10, and the sliding surface of each divided piece 11a and llb of the gland packing 10. 1
Pressure 8. Further, the compressed gas coming from the upstream side is transmitted from the gap 41 between the piston rod 7 and the backing case 4 to the space between the backing case 4 and the gland packing 10 [4].
2, backing case 4 and ground packing 1
However, the gap 42 between the backing case 4 and the gland packing 10 is extremely narrow (approximately 0
．． 05/100 mm), it enters the gap 12 and each divided piece 11a and l of the gland packing 10
There is a time delay before the outer circumferential surfaces 17a and 17b of the gland packing lO are pressurized compared to the compressed gas that pressurizes the sliding surface 18 mentioned above, and this compressed gas pressurizes the outer circumferential surfaces 17a and 17b of the gland packing lO. In the term of pressurizing the gland packing 17b, the compressed gas that was pressurizing the sliding surface 18 of the gland packing IO disappears as the gap 41 is suddenly reduced H4 with the suction stroke of the piston.

Therefore, in the compression stroke of the piston, the gland packing 10 is acted upon to push and spread the divided pieces 11a and llb toward the outer circumference, and in the suction stroke of the piston, each divided piece 11a and llb is pushed against the piston rod 7. As the gland packing 10 receives such continuous action, the garter spring 8, which is tightened to the outer peripheral surfaces 17a and 17b, is subjected to frequent expansion and contraction action for a long period of time. It has been found that the connecting portion 82 at the base of the feeding hook 81 is most likely to be damaged. Therefore, the present inventor proposed ground packing 1
0 corresponds to each divided piece 11a according to the compression and suction stroke of the compressor.
He discovered that the life of the garter spring 8 could be extended by preventing Ilb from causing expansion and twisting movements, and completed Kizamae.

Next, as shown in Figure 4, in the case of two split-type gland packings stacked one above the other (take the example of the 8-split type gland packing IOA in the upper row and the 6-split type gland packing 2OA in the lower row). ) is used for a long time, the gap d between each divided piece 11A of the upper 8-split type gland packing IOA becomes close to X7, so the compressed gas coming from the upstream side is From the gap 41A with 4A to the gap 4 between piston door A and gland packing IOA and 2OA
4A, each divided piece of ground packing IOA 1
1A and the sliding surface 28A of the divided piece 21A1 of the gland packing 20A. Also, the compressed gas coming from the upstream side flows from the gap 41A between the piston rod 7A and the backing case 4A to the backing case 4A.
It penetrates into the gap 12A between the packing case 74A and the ground packing IOA and 20A through the gap 11fi 42A between the backing case 4^ and the ground packing IOA, but the gap 42A between the backing case 4^ and the ground packing IOA is extremely narrow (approximately 0.05/100 mm) and ground packing IOA by penetrating the FjN12A between
The outer peripheral surface 17A of each divided piece 11A and the outer peripheral surface 2 of each divided piece 21A1 and 21A2 of the gland packing 20A.
By the time T A I and 27A2 are pressurized, there is a time delay compared to the compressed gas that pressurizes the sliding surfaces 18A and 28A, and this compressed gas is used as the gland packing IOA.
By the time the outer circumferential surface 17A of the gland packing 20A and the outer circumferential surfaces 27AI and 27A2 of the gland packing 20A are pressurized, the sliding surface 18A of the gland packing 10A and the gland packing 20
The compressed gas that was pressurizing the sliding surface 28A of A is suddenly depressurized in the gap 41A with the suction stroke of the piston and disappears.

Therefore, in the compression stroke of the piston, the gland packings IOA and 2OA are acted upon to push and expand the divided pieces 11A, 21A1 and 21A2 toward the outer periphery, and in the suction stroke of the piston, the gland packings IOA and 2OA are acted upon to spread the divided pieces 11A, 21A1 and 21A2 outward. are pushed toward the piston rod 7A, and the gland packings IOA and 20A are subjected to such a continuous action, so that the garter springs 8 and 20A are tightened on the outer circumferential surfaces 17A, 27A1, and 27A2. 8 is the joint 82 at the base of 7 Tsuk 81, which continues to be subjected to frequent expansion and contraction for a long time and is the weakest.
It was found that this resulted in damage. Therefore, the inventor of this invention
The gland packing IOA and 20A are divided into respective divided pieces 11A and 21A1 and 21 according to the compression and suction stroke of the compressor.
The inventors have discovered that the life of the garter spring 8 can be extended by preventing A2 from expanding and pushing, respectively, thereby completing the present invention.

(4) Means for Solving the Problem The present inventor succeeded in easily solving the above problem by partially processing the upper surface of the split type gland packing 10 or IOA.

That is, in the present invention, in the ground packing consisting of one split type, the upper surface 110 of the split piece 110
1 is provided with a gland packing 100 in which shallow grooves 180 are bored across each of the inner circumferential surfaces 180 to the outer circumferential surfaces 170.

Furthermore, in the case of gland packing consisting of two vertically stacked split-type gland packings, the upper surface 1101A of the split piece 110A of the upper split-type gland packing 100A is connected to the outer circumferential surface 1 from the inner circumferential surface 180A side.
A shallow groove 186A that crosses toward the 70A side is provided.

The shallow groove 180 or 180A connects the upper surface 1101 or ll0IA of the dividing piece 110 or 110A to the inner circumferential surface 180 or 180.
Any shape may be used as long as it crosses from the A side to the outer peripheral surface 170 or 170A side, and the groove width and groove depth are determined each time depending on the gas compression pressure, the width of the dividing piece, etc.

(5) In the case of the Wll type gland packing 100 for one action, as in the case of FIG. 1, compression from the upstream side of the piston rod (not shown) is due to ) through the gap (corresponding to 41 in FIG. 1), and the sliding surface 18 of the dividing piece 110
0 gap (corresponding to 44 in FIG.
The gas pressure applied to the sliding surface 180 of the garter spring 8 and the gas pressure applied to the outer peripheral surfaces 170 and 171 are balanced, and the split pieces 110 and 111 do not move to spread or push in due to the pressure difference, and therefore the garter spring 8 also No frequent expansion and contraction.

In addition, two ground packings 100A are placed on top and bottom.
And in the case of 200A, the compressed gas from the upstream side of the piston rod (not shown) is transferred to the gap (not shown) between the piston rod and the backing case (not shown), as in the case of FIG.
corresponding to 41A in FIG.
A (corresponding to 44A in FIG. 4) enters the gap A (corresponding to 44A in FIG.
Outer peripheral surfaces 170A and 270A1 and 2 of 0A and 200A
Since it reaches 70A2, ground packing 100A
and the gas pressure applied to the sliding surfaces 180A and 280A of 200A and the outer peripheral surfaces 170A, 270A1 and 270A2
Since the gas pressure applied to the garter spring 8 is balanced, the above-mentioned pushing-out movement and pushing-in movement do not occur, and therefore the garter spring 8 also expands and contracts frequently.

Therefore, in the case of any split type of gland hole sizing, the weakest part of the garter spring 8, the root part 82 of the seven hooks 81, is less fatigued, and wear and breakage at the hook joints is reduced. This can be prevented and the life of the garter spring 8 can be extended.

(6) Embodiment The embodiment of the present invention of one split type gland/four-piece king is a six-piece type with an outer diameter of 64 mm, an inner diameter of 88 mm, and a thickness of 12 mm, as shown in Figures 2 to 8. At the center of each of the eight divided pieces 110 of the gland packing 100, from the inner circumferential surface 180 to the outer circumferential surface 17
A shallow groove 180 with a width of 7 mm and a depth of 1.8 mm is bored across the 0.

In addition, an embodiment of the present invention in which two pieces of divided type gland packing are stacked one above the other is shown in FIGS. 5 to 8.
The upper split type gland packing 100A has an outer diameter of 78 mm, an inner diameter of 50 mm, and a thickness of 11 mm.
．． At the center of each of the eight divided pieces 110A of the 8 mm 8-split type gland packing, there is an inner circumferential surface 18.
A shallow groove 180A having a width of 12 mm and a depth of 1 mm is bored across the outer peripheral surface 170A from 0A.

(7) Effects of the Invention As described above, according to the present invention, by slightly modifying the conventional split-type gland packing, the life of the garter spring can be greatly extended, and the manufacturing cost can be reduced. There is an advantage.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view of a shaft sealing device using a conventional single split type gland packing, Figure 1g2 is a plan view of a single split type gland packing showing an embodiment of the present invention, and Fig. 8 is a front view of FIG. 2, FIG. 4 is a vertical cross-sectional view of a shaft sealing device using two conventional vertically stacked split-type gland packings, and FIG. 5 is a vertically sectional view showing an embodiment of the present invention. Of the two stacked split-type gland packings, FIG. 6 is a plan view of the upper gland packing, FIG. 6 is a cross-sectional view taken along the line x-X of FIG. 6, and FIG. FIG. 8 is a plan view of the gland packing, FIG. 8 is a sectional view taken along the Y-Y line in FIG. 7, and FIG. 9 is a perspective view of the gartanup ring. 100...... Gland packing consisting of one split type, 110...... Divided piece 1101... Upper surface 180...・・・・・・Shallow groove 170・・・・・・Outer peripheral surface 180・・・・・・Inner peripheral surface 100Δ・・・・・・Two pieces stacked one above the other Among the split types, J two-tier gland packing, 11
0A......Divided piece 1101A...Top surface 180A...Shallow groove 170A...Outer peripheral surface 180A...・・・・・・Inner surface 200A・・・・・・Lower gland packing of two split type stacked one on top of the other. Agent Bengoshi Ya Watanabe - Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (2)

[Claims] (1) A gland packing consisting of one divided type, characterized in that shallow grooves are formed in the upper surfaces of each of the divided pieces, running from the inner circumferential side to the outer circumferential side. (2) In gland packing consisting of two split-type gland packing stacked one on top of the other, shallow grooves are cut across the upper surface of each split piece of the upper split-type gland packing from the inner circumference side to the outer circumference side. Ground packing is characterized by the following: