JPS6240211Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a gland seal device used for valves, pumps, etc. The gland seal device has a structure in which a gland packing is packed in a stuffing box around a shaft that moves in the axial direction or rotates about the axis, and seals are achieved at a friction surface between the shafts.
In the prior art, to prevent fluid leakage, the gland packing is tightened with a large force or the number of layers of the gland packing is increased. If the gland packing is tightly tightened, the frictional force with the shaft will increase, and the force required to move the gland in the axial direction or the torque around the axis will increase. It also requires frequent maintenance. Increasing the number of layers of ground packkin results in
The stuffing box becomes larger, it takes a lot of time to replace the gland packing, and the amount of gland packing required increases. Furthermore, by increasing the number of layers of the gland packing in this manner, the force required to move the shaft or the torque for rotation increases. The purpose of the present invention is to reduce the force required to move the shaft in the axial direction or the torque required to rotate around the axis, prevent fluid leakage, and further reduce the amount of gland packing required.
An object of the present invention is to provide a gland seal device that can be made smaller. FIG. 1 is a sectional view of a gland seal device according to an embodiment of the present invention. A shaft 2 that moves in the axial direction or rotates around the axis is inserted into a stuffing box 1 such as a valve or a pump.
The storage space 3 formed in the stuffing box 1 is concentric with the axis of the shaft 2, and has a uniform inner diameter along the axis. In the storage space 3, there are gland packings 6, 7, 8 and rings 10, 11, 1.
2 and 13 are interposed alternately.
The gland packings 6, 7, and 8 have, for example, a string-like longitudinal shape as shown in FIG. 2, and are made of, for example, asbestos. Such a string-shaped gland packing is appropriately cut in the length direction into a ring shape, and then packed into the storage space 3. The ring 10 disposed at one end of the storage space 3 in the axial direction has a cross-sectional shape shown in FIG. This ring 10 is made of a material such as Teflon (trade name), and one surface 31 in the thickness direction (ie, axial direction) is a flat surface perpendicular to the axis. The other surface of the ring 10 has a protrusion 32 that protrudes to the right in FIG. 3 in the thickness direction and continues in the circumferential direction. This ring 10 has protrusions 32
It tapers radially inwardly and outwardly from the top 33. This inclined surface is designated by reference numeral 34,
35. The radially inner end 16 and the radially outer end 17 of the ring 10 are sharply formed. flat surface 31 of ring 10
is supported by the end portion 18 of the storage space 3 of the stuffing box 1. The cross section of the protrusion 32 shown in FIG. 3 is symmetrical with respect to a plane parallel to the axis passing through the apex 33, and is in the form of an isosceles triangle. The other ring 13 has a similar configuration to the ring 10, and its flat surface is supported by the ground presser 5. The ring 11 has a cross-sectional shape shown in FIG. This ring 11 has protrusions 21 and 22 that protrude from both sides in the thickness direction (left-right direction in FIG. 4) and are continuous in the circumferential direction. Top 2 of protrusions 21 and 22
3 and 24 so that it gradually becomes thinner inward and outward in the radial direction.
6; sloped surfaces shown as 27 and 28 are formed.
The radially inner and outer ends 29, 30 of this ring 20 are sharply formed. Projections 21, 22
The cross section shown in FIG. 4 is symmetrical with respect to a plane parallel to the axis passing through the tops 23, 24. The remaining rings 12 also have a similar configuration. In this way, in the storage space 3, the ground packing 6 is
deforms to expand radially inward and outward. In addition, the inclined surfaces 25, 26; 27 of the ring 11;
28 deforms the gland packings 6, 7 so as to expand radially inward and outward. This improves the sealing performance between the gland packing 6 and the outer peripheral surface of the shaft 2, and also improves the sealing performance between the gland packing 6 and the inner peripheral surface of the storage space 3. The same applies to the remaining gland packings 7 and 8. In this way, with a relatively small amount of gland packings 6, 7, and 8, it is possible to improve airtightness and reduce the force required to move the shaft 2 in the axial direction or the torque required to rotate it around the axis. Become. The ridges 32, 21, 22 taper radially inwardly and outwardly to form ends 16, 17; 29, 30;
Since the ring is sharp, the sealing performance can be improved without being adversely affected by the thickness of the rings 10 and 11. Table 1 shows experimental results in the case where the configuration shown in FIG. 1 according to the present invention is applied to a valve having a nominal diameter of 100 A specified by the Japanese Industrial Standards, together with comparative examples.

[Table] According to the experimental results of the embodiment according to the present invention, the leakage of nitrogen gas of 11 kg/cm ² can be prevented when the torque of shaft 2 is 170 kg・m, whereas the minimum torque required to rotate shaft 2 is Leakage occurred when the weight was 150Kg・m. On the other hand, in the comparative example, in the conventional configuration that does not use a ring, no leakage occurred when the gland presser 5 was tightened so that the minimum torque required to angularly displace the shaft 2 was 200 kg・m. , leakage occurred when the minimum torque required to angularly displace the shaft 2 was 180 Kg·m. According to Table 1, leakage occurred even when the torque required to angularly displace the shaft 2 was 180 kg・m in the comparative example, but according to the present invention, leakage occurred even when the torque required to angularly displace the shaft 2 was 170 kg・m. It can be seen that no leakage occurs either, and that the sealing performance is improved according to the present invention. FIG. 5 shows an apparatus for conducting experiments of the present invention. In this experimental apparatus, components corresponding to the embodiment shown in FIG. 1 are given the same reference numerals. The stuffing box 1 has annular grooves 41, 42, 43 facing the storage space 3, and the shaft 2 has annular grooves 44, 45 corresponding to the grooves 41, 42, 43. , 46 are formed.
A guide hole 47 that extends radially outward is formed in association with the groove 44 . A flexible cylindrical body 48 is housed in the groove 41, as shown in FIG. Both ends 49 and 50 of this cylindrical body 48 are closed, and the cylindrical body 48 is communicated with the end of a tubular body 51 inserted into the guide hole 47. The other end of the tube body 51 is a U-shaped water column gauge 5.
2 ends. The other end of the water column gauge 52 is open to the atmosphere. A radially inward surface 53 of the cylinder 48 is provided with gland packings 6, 7, 8, 9.
In a state where the rings 10, 11, 12, 12a, and 13 are not interposed, they protrude radially inward from the storage space 3. Remaining grooves 42, 4
3 is also provided with airtight flexible cylinders 81 and 82,
These cylinders 81 and 82 are connected to water column gauges 54 and 55 in the same manner as described above. Also, the grooves 44, 4
5, 46 are airtight flexible cylinders 83, 84, 85.
are provided, and water column gauges 56, 5 are provided as described above.
7,58. Grand Patsukin 6,
The radially inward and outward pressures of water column gauges 52, 54, 55, 56, 57,
58 respectively. FIG. 7 shows experimental results using water column gauges 56, 57, and 58. The positions of the flexible cylinders 83, 84, 85 along the axis of the shaft 2 are indicated by the same reference numerals 83, 84, 85,
85. Line l1 in FIG. 7 is the experimental result according to the present invention, and line l2 is the ring 1
0, 11, 12, 12a, 13 are removed and the gland packings 6, 7, 8, 9 are pressed down. Line 13 is the ring 10, 11,
Experimental results when flat rings were used in place of 12, 12a, and 13 are shown below. The pressure index refers to the value of the cylinders 44, 4 when the lowest value of pressure measured by the water column gauges 56, 57, 58 is set to zero.
Shows the pressure difference between 5 and 46. As for other experimental results, as shown in FIG. 7, line 14 was obtained in the embodiment according to the present invention, and line 15 was obtained when a flat ring was used. According to these experimental results, it can be seen that in the present invention, the pressing force by the gland presser 5 is well transmitted even at a position distant from the gland presser 5. In the measurement results indicated by reference numbers 60a and 60b, the cylinder body 48 is located between the gland packings 7 and 8, and therefore it is assumed that the pressure due to the gland packings 7 and 8 was not sufficiently transmitted. be done. Ring 10, 11, 1
2, 12a, and 13 are omitted, or when they are flat rings, the line l
Gland presser 5 as shown by 2, l3, l5
It is clear that the pressing force by the gland presser 5 is not sufficiently transmitted at a position away from the ground, and therefore the sealing performance is poor. Thus, it can be seen that the embodiment of the present invention has excellent sealing performance. FIG. 8 shows the pressure index detected by water column gauges 52, 54, 55. In the experimental results shown in FIG.
The line 18 shows the experimental results when flat rings were used as the rings 10, 11, 12, 12a, and 13. These experimental results also show that the gland presser 5
It can be seen that the pressure caused by this is sufficiently transmitted in the axial direction. 8. In the experiment shown in FIG. 2, line l9 shows the measurement results of one embodiment of the present invention, and line l10
shows experimental results when flat rings were used for rings 10, 11, 12, 12a, and 13. This experimental result also shows that the pressing force by the gland presser 5 is sufficiently transmitted in the axial direction. This improves the sealing performance on the inner circumferential surface of the storage space 3. In FIG. 9, the results of two measurements by water column gauges 52, 54, and 55 are shown by lines l11 and l12, respectively, and the results of two measurements by water column gauges 56, 57, and 58 are shown by lines l13 and l14. There is. The pressure exerted by the gland presser 5 is sufficiently transmitted in the axial direction, improving sealing performance. According to this experiment, the pressing force on the inner circumferential surface of the storage space 3 is much larger than the pressing force on the outer circumferential surface of the shaft 2, and therefore the pressing force on the outer circumferential surface of the shaft 2 increases. It is desirable to improve airtightness. This problem,
The problem is solved by the embodiment described below. FIG. 10 is a sectional view of another embodiment of the present invention. This ring 60 has protrusions 61 and 62 that protrude in the thickness direction, and the top portions 63 and 64 are displaced radially outward. 60 rings like this
were used instead of rings 11, 12, 12a in the experimental apparatus shown in FIG. Use instead. In this case, the water column gauges 52, 54, and 55 can obtain the measurement result shown in line l15 shown in FIG. 11, and the water column gauges 56, 57, and 58 can obtain the measurement result shown in line l16. Ta. In this way, the pressing force on the outer circumferential surface of the shaft 2 and the pressing force on the inner circumferential surface of the storage space 3 became high values that were almost similar. Compared to the measurement results shown by lines l13 and l14 in FIG. 9, it can be seen in FIG. 11 that a sufficient pressing force acts on the outer circumferential surface of the shaft 2 to further improve the sealing performance. FIG. 12 is a sectional view of another embodiment of the present invention. In this embodiment, the ring 65 is formed with protrusions 66 and 67 that protrude in its thickness direction.
The tops 68, 69 are radially inward.
Due to this, Grand Packkin 6, 7,
The sealing performance can be improved by setting the pressing force of the shaft 2 to the outer peripheral surface of the shaft 2 and the pressing force of the housing space 3 to the inner peripheral surface of the housing space 3 to substantially equal high values. Projection 66,
The tops 68, 69 of 67 may be offset radially inward to facilitate movement or rotation of the shaft 2 and to provide cooling of the shaft 2 by leakage fluid. In other embodiments of the present invention, the tops of the ring protrusions may be rounded or may have other shapes that protrude in the thickness direction. As described above, the gland seal device of the present invention reduces the force required to move the shaft in the axial direction or the torque required to rotate around the axis, prevents fluid leakage, and reduces the amount of gland packing required. This enables miniaturization.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a perspective view of a part of the gland packing 6, FIG. 3 is a sectional view of the ring 10, FIG. 4 is a sectional view of the ring 11, and FIG. The figure is a cross-sectional view of the experimental equipment, and Figure 6 is a simplified 4
8, FIG. 7, FIG. 8, and FIG. 9 are perspective views of FIG.
A graph showing experimental results when using the experimental apparatus shown in the figure, FIG. 10 is a cross-sectional view of a ring 60 of another embodiment of the present invention, and FIG. 11 is a graph showing the results of an experiment using the ring 60 of the embodiment shown in FIG. FIG. 12 is a cross-sectional view of a ring 65 according to another embodiment of the present invention. 1...stuffing box, 2...axis, 3...
...Storage space, 6, 7, 8, 9...Grand packing, 10, 11, 12, 12a, 13, 60, 6
5...Ring.

Claims (1)

[Claims for Utility Model Registration] (1) A stuffing box is packed with gland packing and rings interposed alternately, and the ring has a protrusion that protrudes in the thickness direction and continues in the circumferential direction. A gland seal device characterized in that the thickness becomes thinner radially inward and outward in the thickness direction from the top of the strip. (2) The gland seal device according to claim 1, wherein the radially inner and outer ends of the ring are sharp.