JPS6237018Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a gland packing for holding down a seal for a shaft sealing device.

FIG. 1 is a longitudinal sectional view of a single-suction centrifugal pump.
The pump casing 1 is fitted into and fixed to a ground cover 3 which is fitted into and fixed to a bearing pedestal 2. Inside the pump casing 1, a main shaft 5 supported by a sealed ball bearing 4 which is fitted into the bearing pedestal 2 is provided on the ground cover 3. An impeller 7 is fixed through the shaft sealing device 6 and protruding into the pump casing 1 . The pump casing 1 is provided with a suction port 8 and a discharge port 9. A drainage ring 10 is secured to the main shaft 5 between the shaft sealing device 6 and the sealed ball bearing 4. The bottom of the bearing stand 2 is sloped and has a drain hole 12 provided therein.

The shaft sealing device 6 is a main shaft 5 provided on the ground cover 3.
A round hole 14 is made in the boss 13 that penetrates through the boss 13 so that a cylindrical space is created between the main shaft 5 and the gland packing 15 is inserted. Insert the installed stud bolt 18 through the bolt hole of the flange 19 of the packing holder 16, screw the nut 21 into the stud bolt 18, propel the packing holder 16, press the gland packing 15, and connect the gland packing 15 to the main shaft 5 in a round shape. It is brought into pressure contact with the hole 14 to prevent leakage from the pump chamber.

The bearing pedestal 2 is provided with a window 22 for assembly and maintenance, and the bearing pedestal 2 is connected to the fitting portion of the ground cover 3 and the bearing housing side in which the ball bearing 4 is housed by supporting members at the top and bottom. The support member is A in FIG.
As shown in FIG. 2, which is an enlarged cross-sectional view of -A, only the lower side is shown, but the same is true for the upper side, and the lower support member has a groove-shaped cross section and forms a leakage liquid receiver 23. As already exemplified, the leakage liquid is guided from the bottom of the leakage liquid receiver 23 to the outside of the machine through the drain hole 12 with a slope.

When the main shaft 5 is driven, the impeller 7 rotates, and the water sucked in from the suction port 8 is transferred from the impeller 7 to the swirl chamber 24.
and is discharged from the discharge port 9 provided in the pump casing 1.

When using a gland packing for shaft sealing, an appropriate amount of gland packing should be leaked in order to remove frictional heat between the gland packing and the rotating shaft and to provide lubrication. This leaked liquid travels along the shaft and leaks from the outside of the seal holder. FIG. 2 shows a conventional packing holder. The packing presser 16 is generally the packing presser 1.
6 is installed as shown in the figure so that the direction of the flange 19 is oriented diagonally so that the nut 21 can be screwed in easily.

In the case of the conventional packing holder shown in Figs. 1 and 2, when the leaked liquid exits the packing holder, it is scattered in all directions by the centrifugal force of the main shaft, and the liquid that has passed along the outer end surface G of the packing holder is Fall from the bottom H. Furthermore, although it is generally a small amount, the leaked liquid coming out from the gap between the round hole 14 and the holding part 17 travels along the inner end surface of the flange 19 and falls from the lowermost part H. Since part H is located outside of the leakage liquid receiver, the installation floor around the equipment will be contaminated with the splashed liquid.
Since this phenomenon occurs even when the amount of leakage is not very large, it is necessary to frequently retighten the gland packing to keep the amount of leakage to a minimum.

As an improvement to the above, the idea disclosed in Japanese Utility Model Publication No. 45-31962 uses a sliding part that slides on the rotating shaft on the outside of the gland holder to scoop up the leaked liquid, and guides and removes the leaked liquid through the outlet part. However, there are disadvantages in that the number of parts increases, wear countermeasures are required, and leakage liquid transmitted through the gland holder cannot be collected.

In addition, the idea disclosed in Japanese Utility Model Application Publication No. 54-174761 provides a leakage collection chamber in the packing holder, a drain hole is provided at the bottom of the chamber, and a conduit is used to guide the liquid to the drain receiver, but the structural members are In many cases, it is necessary to provide a leakage draining section in the leakage collection chamber, which is complicated.

This idea forms a cylindrical space on the casing side around the outer periphery of the insertion part of the rotating shaft, inserts a shaft sealing material between the cylindrical space and the rotating shaft, and seals the shaft sealing material with a packing holder that fits into the cylindrical part. In a shaft sealing device that seals the rotating shaft by applying pressure in the axial direction, and a leakage liquid receiver is arranged on the seal presser side, this reduces the scattering of leaked liquid from the shaft sealing device due to the centrifugal force of the rotating shaft, and To provide a packing holder capable of preventing leaked liquid from the lowest part of the packing holder from falling to the outside from a leakage liquid receiver at the lower part of the packing holder.

Embodiments of this invention will be described below with reference to the drawings.

FIG. 3 is shown as a sectional view taken along line AA in FIG. Although a conventional packing holder is shown in FIG. 1, the packing holder shown in FIG. 3 is attached instead. FIG. 4 is a sectional view taken along line BB in FIG. 3.

The overall structure for providing a function of pressing the gland packing 15 consisting of the holding part 17 and the flange 19 is the same as that of the conventional example, and the flange 19 is provided with a bolt hole 18' through which the stud bolt 18 is inserted.
The outer side of the presser portion 17 has a conical inner diameter surface A that widens toward the end surface G, and a cutout portion 25 is formed as a space. The notch 25 is spaced apart from the main shaft 5 by a large distance and forms a space that ends from the outside. The inner diameter of the end of the presser part 17 forms a loose fitting part 26 with a small clearance from the main shaft 5, so that the outer diameter part 27 of the presser part 17 slides into the round hole 14. Flange 1
On one side of the lower outer peripheral edge of the bolt hole 9, there is provided an inclined surface 29 having an angle C downward from the horizontal toward the perpendicular line 28 passing through the center of the main shaft 5, in contact with the arcuate end of the flange on the outside of the bolt hole 18'. A protrusion 31 is provided. A perpendicular line extending downward from the lowermost end 32 of the slope portion 29 is located within the groove of the leakage liquid receiver 23. The slope portion 29 is formed at an angle such that the attached liquid does not separate and fall midway through the flow toward the lowermost end 32.
In the embodiment, the slope portion 29 is a straight line, but it may also be a curved line (without a turning point).

As shown in FIG. 3, when the seal retainer 16 is attached to the ground cover 3 so that the line connecting the bolt holes 18' on both sides of the flange 19 is diagonal, the flange 19 has a notch 25 below it. A horizontal edge 33 is provided. A drain hole D is provided as a through hole extending from the lowermost portion of the inner diameter portion A to the end edge 33.

In FIG. 4, the leaking liquid that has passed between the main shaft 5 and the loosely fitting part 26 of the packing retainer 16 is transmitted from the loosely fitting part 26 to the inner diameter surface A of the notch 25 and falls, and the other is transmitted to the main shaft 5 and the resulting centrifugal force It is divided into those that are blown away by. The maximum amount of the centrifugal force of the main shaft 5 is blown away at the part where the loose fitting part 26 exits into the notch part 25. Since the notch 25 is wide, the leaked liquid blown away by the centrifugal force of the main shaft 5 hits the inner diameter surface A and is decelerated. Then, the liquid flows from the lower side of the inner diameter surface A toward the end surface G side, passes through the drain hole D, and falls into the leakage liquid receiver 23. The leaked liquid that did not enter the drain hole D due to a large amount of leakage or was blown off by the centrifugal force of the main shaft 5 flows through the seal presser end face G and into the protrusion 3.
Leading to 1. The protrusion 31 has a corner C and is located at the lowermost part of the flange 19 of the packing presser 16, and the leaking liquid falls away from the lowermost end 32. Since the position of the lowermost end 32 of the protrusion 31 is inside the leakage liquid receiver, the leaked liquid falls into the leakage liquid receiver 23 and drains into the drain hole 12.
and will not fall onto the installation floor. The scattering of the seal presser foot 16 on the outside side is also extremely reduced.

Leakage liquid coming out from the gap between the outer diameter part 27 of the presser part 17 and the round hole 14 is transmitted through the outer diameter part 27 and is transferred to the outer diameter part 2.
It is transmitted downward around the corner where 7 and the inside of the flange 19 meet. The water then travels along the inner surface of the flange 19, reaches the protrusion 31, merges with the leaked liquid from between the main shaft 5 and the loose fitting part 26, falls away from the lowest end 32, and falls into the leaked liquid receiver 23. It is discharged from the extraction hole 12. In addition, if a circumferential groove 34 is provided in the outer diameter part 27 of the part where the outer diameter part 27 of the presser part 17 and the inner surface of the flange 19 meet, as shown by the two-dot chain line in FIG. This is effective in guiding liquid leaking from the gap in the outer diameter portion 27 of the flange along the flange side.

As mentioned above, this invention uses a gland packing as a shaft sealing material to push the gland packing between the rotating shaft and the cylindrical round hole formed in the casing boss through which the rotating shaft is inserted. Since a cylindrical notch was created in the opening, the centrifugal force of the rotating shaft prevents the leaking liquid from scattering in all directions.
It travels down the inner diameter side of the notch. Then, a drain hole was provided at a position above the leakage liquid receiver, which penetrates the flange edge downward from the inner diameter side of the notch of the packing holder, which is installed so that the line connecting the mounting holes of the flange is diagonal. Most of the leaked liquid flowing on the inner diameter side of the notch passes through the drain hole and falls into the leaked liquid receiver.

Furthermore, when the seal holder is installed obliquely on the flange, a lower part located above the groove of the leakage liquid receiver is attached to the side facing the leakage liquid receiver arranged below the sealer holder on the outer peripheral edge of the flange. Since the oriented protrusion is provided, leaked liquid that cannot escape through the drain hole and other leaked liquid that travels along the inner and outer end surfaces of the flange travels through the protrusion and falls into the leakage liquid receiver.

The notch, the drain hole, and the leakage liquid receiver prevent the leakage liquid leaking from between the packing holder and the rotating shaft from scattering in all directions and from falling outside the leakage liquid receiver even when a considerable amount of leakage occurs. This prevents the floor on which the equipment is installed from getting dirty, and the interval between retightening of the gland packing becomes longer.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a horizontal single-suction centrifugal pump, Figure 2 is a cross-sectional view taken along line A-A in Figure 1, and Figure 3 is a cross-sectional view taken along line A-A in Figure 1, showing an embodiment of this invention. , FIG. 4 is a sectional view taken along line BB in FIG. 2. 1...Pump casing, 2...Bearing stand, 3...
...Ground cover, 4...Ball bearing, 5...Main shaft,
6... Shaft sealing device, 7... Impeller, 8... Suction port,
9...Discharge port, 10...Draining ring, 12...
Drain hole, 13...Boss, 14...Round hole, 15...
Grand Patsukin, 16...Patsukin presser, 17
... Holding part, 18 ... Plant bolt, 18' ... Bolt hole, 19 ... Flange, 21 ... Nut, 22
... window, 23 ... leakage liquid receiver, 24 ... swirl chamber,
25... Notch portion, 26... Loose fitting portion, 27... Outer diameter portion, 28... Perpendicular line, 29... Slope portion, 31... Projection, 32... Lowermost end, 33... End edge, 34 ...Circumferential groove, D...Drain hole.

Claims (1)

[Scope of utility model registration request] A packing that has a round hole on the casing side on the outer periphery of the part through which the rotating shaft is inserted, inserts a shaft sealing material between the round hole and the rotating shaft, and is equipped with a presser part and a flange that fit into the round hole, and the flange is attached diagonally. In a shaft sealing device that seals the shaft of a rotating shaft by pressing the shaft sealing material in the axial direction with a presser foot and a leakage liquid receiver arranged below the sealer, the space between the inner circumference of the presser and the rotating shaft is removed from the outside. A through hole is provided so as to end from the side, and a through hole is provided downward from the lower end of the inner periphery of the space to the edge of the flange so that the groove for the leakage liquid receiver is directly above the groove for the leakage liquid receiver, and the groove for the leakage liquid receiver is provided at the edge of the flange of the seal holder. A seal retainer for a shaft sealing device, which has a protrusion extending downward from the outer periphery of the flange edge toward the leakage liquid receiver.