JP2002349715A - Shaft sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft sealing device that can ensure efficient lubrication and cooling for a long period. SOLUTION: A liquid lubricant is atomized in an atomizing part 9 of a spraying means 14 and supplied to a spray ring 4 via a supply passage 11. The liquid lubricant thus supplied is guided by the spray ring 4 to sliding surfaces of gland packing 3 and a rotary shaft 10. The liquid lubricant supplied to the packing sliding surfaces is discharged through an exhaust port 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft sealing device for preventing leakage at a penetrating shaft portion of a fluid device such as a stirring device.

[0002]

2. Description of the Related Art Conventionally, a shaft sealing device as shown in FIG. 3 is generally used in order to prevent leakage at a penetrating shaft portion of a fluid device such as a stirring device, a mixing device, a reaction device and the like. . In the shaft sealing device 21, as shown in FIG. 3, a gland packing 23 is provided inside a packing box 22, and the gland packing 23 is fastened by a fastening member 29. The tightening member 29 is screwed into the packing retainer 24 and the packing box 23, and a tightening bolt 25 having the packing presser 24 inserted therethrough, and a tightening bolt 25
And a tightening nut 26 attached to the mounting member. The shaft sealing device 21 has a lantern ring 27 between the gland packings 23 in the packing box 22. The lantern ring 27 is used to lubricate and cool the gland packing 23 and the rotating shaft 28 by using a method such as water lubrication, grease lubrication, oil dripping, oil storage and oil circulation.

[0003]

However, in the conventional shaft sealing device described above, for example, when the fluid to be used is a high-temperature resin and the fluid is used in a fluid device in which the peripheral speed of the rotating shaft is 1 m / s or more. Had the following problems. For example, when extreme cooling such as water lubrication is performed, the fluid that has entered the sliding surface between the gland packing 23 and the rotating shaft 28 (hereinafter referred to as the packing sliding surface) solidifies, causing abnormal wear of the gland packing 23. The connection was short-lived. When the entry of water into the fluid device affects the product, water lubrication cannot be performed. Since the packing sliding surface is at a high temperature, methods such as grease lubrication, oil dripping, and oil accumulation cannot provide a sufficient cooling effect. For example, when a fluid leaks, if the tightening nut 26 is tightened to increase the pressure for pressing the gland packing 23 with the packing presser 24, the heat generated by the sliding between the gland packing 23 and the rotating shaft 28 increases, and seizure can occur. There is. For this reason, the tightening nut 26 cannot be retightened, and the operation has to be performed in a state where the fluid leaks. When the fluid that has entered the packing sliding surface is carbonized by the sliding heat, or when the fluid contains a highly flammable component, the sliding heat may cause ignition. The present invention has been proposed in view of the above circumstances, and has as its object to provide a shaft sealing device capable of efficiently performing lubrication and cooling over a long period of time.

[0004]

The present invention employs the following means to achieve the above object. That is, in a shaft sealing device in which at least one gland packing is interposed between the rotating shaft and the packing box and the gland packing is axially fastened by a fastening member, the rotating shaft is disposed adjacent to the gland packing. And a spray ring interposed between the packing box and guiding the lubricating liquid to a sliding surface between the gland packing and the rotating shaft,
A supply path that penetrates the packing box and supplies the lubricating liquid to the spray ring, a spraying unit having an atomizing unit that supplies the lubricating liquid to the supply path in a mist state, A means for providing a discharge port for discharging is adopted (claim 1).

[0005] With this configuration, the mist-like lubricating liquid supplied to the supply path from the atomizing section of the spraying means is supplied to the sliding surface between the gland packing and the rotating shaft (hereinafter referred to as packing sliding) by the spray ring. Surface). This makes it possible to efficiently cool the vicinity of the packing sliding surface whose temperature rises due to the heat generated between the gland packing and the rotating shaft. In addition, since lubricating properties can be given to the packing sliding surface, the sealing performance of the shaft sealing device can be stabilized for a long time. Furthermore, the fluid that has entered the packing sliding surface and the carbide that has been carbonized by the sliding heat can be discharged from the discharge port, so that the possibility of ignition due to the sliding heat can be minimized. Further, since the lubricating liquid is supplied in the form of a mist, a large amount of the lubricating liquid is not required, so that the lubricating liquid hardly enters the fluid device.

The spraying means sprays the lubricating liquid onto the sliding surface over the entire circumference of the rotating shaft. In this case, since the lubricating liquid is supplied to the packing sliding surface over the entire circumference of the rotating shaft, the vicinity of the packing sliding surface can be more efficiently lubricated and cooled. Further, the spray ring may be composed of a pair of members having at least one end face near the inner periphery and a protrusion for guiding the lubricating liquid to the sliding surface. 3). In this case, since the mist-like lubricating liquid introduced from the supply path goes to the packing sliding surface along the projection of the spray ring, it is efficiently supplied to the packing sliding surface. Further, it is preferable that the spray ring is disposed closer to the atmosphere than the gland packing (claim 4). In this case, the lubricating liquid is mainly supplied to the vicinity of the packing sliding surface of the gland packing on the atmosphere side where the temperature is most likely to rise due to the heat generated between the gland packing and the rotating shaft. Can be. Also,
For this reason, the fluid that intrudes from the packing sliding surface of the gland packing on the most sealed side becomes hard to solidify.

[0007]

(Embodiment 1) FIG. 1 is a schematic sectional view showing an embodiment of a shaft sealing device according to the present invention.
Hereinafter, the configuration of the shaft sealing device will be described with reference to the drawings. As shown in FIG. 1, the shaft sealing device 1 mainly includes a packing box 2 in which a gland packing 3 and the like are housed, a tightening member 13 for tightening the gland packing 7 and the like, and a spraying unit 14 for spraying a lubricating liquid. It has. The packing box 2 includes a plurality of gland packings 3, and among these gland packings 3, the gland packing 3 on the largest air side.
The spray ring 4 is provided on the air side of the a and the spacer ring 5 is provided on the air side of the spray ring 4. The gland packing 3, the spray ring 4, and the spacer ring 5 are fastened by a fastening member 13. The fastening member 13 includes a packing retainer 6, a tightening bolt 7 through which the packing retainer 6 screwed into the packing box 2 is inserted, and a tightening nut 8 attached to the tightening bolt 7. By this tightening force, the gland packing 3 is deformed so as to be crushed in the axial direction of the rotating shaft 10, and the fluid is sealed by reducing the gap between the gland packing 3 and the rotating shaft 10.

The packing box 2 has a supply passage 11 for supplying the lubricating liquid to the spray ring 4 and a discharge port 12 for discharging the lubricating liquid. The supply path 11 is connected via a tube to an atomizing section 9 for mixing and supplying a lubricating liquid and a nitrogen gas or the like in a mist state. The spacer ring 5 is provided to prevent the supplied lubricating liquid from leaking to the packing retainer 6 side. Note that a gland packing may be provided instead of the spacer ring 5.

As shown in FIGS. 2A and 2B, the spray ring 4 provided in the packing box 2 comprises a pair of annular liquid-side members 4a and atmospheric-side members 4b, and a connecting member 4c. Have been. Both ends of the liquid sealing side member 4a are formed in a flat shape. On the other hand, the atmosphere side member 4b has an end face on the atmosphere side formed in a flat shape, and a projection 41 is formed over the entire circumference near the inner periphery of the end face on the liquid sealing side member 4a side. The outer peripheral surface of the protrusion 41 is formed in a tapered shape, and the taper faces the direction of the sliding surface between the gland packing 3 a on the maximum air side and the rotating shaft 10.
Then, the liquid sealing side member 4a and the atmosphere side member 4b are connected via the plurality of connecting members 4c so that the end surface of the liquid sealing side member 4a and the tip of the protrusion 41 of the atmosphere side member 4b open at a predetermined interval. Is welded. In the spray ring 4 configured as described above, the sealing-side end surface of the sealing-side member 4a and the atmosphere-side end surface of the gland packing 3a on the maximum air side are in contact with the entire surface. The force can be evenly transmitted to the entire atmosphere-side end face of the gland packing 3a.

[0010] The spraying means 14 is used for the packing box 2.
Spray ring 4 and packing box 2
And the atomizing section 9 connected to the supply path 11. The lubricating liquid is atomized by the atomizing section 9 and supplied to the spray ring 4 via the supply path 11. The atomized lubricating liquid supplied from the supply path 11 is diffused in the circumferential direction of the rotating shaft 10 through a space between the inner peripheral surface of the packing box 2 and the connecting member 4c, and is provided on the atmosphere side member of the spray ring 4. It is guided to the entire circumference of the packing sliding surface along the tapered surface of the projection 41 formed in 4b. As described above, the lubricating liquid is supplied in the form of a mist, so that it is easily dispersed, and is supplied to the packing sliding surface over the entire circumference of the rotating shaft 10. Thus, the lubricating fluid is
0 to the packing sliding surface over the entire circumference,
The vicinity of the packing sliding surface can be efficiently lubricated and cooled. Further, since the lubricating liquid flows toward the gland packing 3a along the tapered surface of the projection 41, the lubricating liquid is efficiently supplied to the packing sliding surface. As a result, the vicinity of the packing sliding surface, whose temperature rises due to the heat generated between the gland packing 3 and the rotating shaft 10, can be more efficiently cooled over a long period of time, and the packing sliding surface has lubricity. Can be given. The lubricating liquid supplied to the packing sliding surface as described above is abrasion powder generated by the sliding between the gland packing 3 and the rotating shaft 10, the fluid leaked from the packing sliding surface, and entered the packing sliding surface. The fluid is discharged from the discharge port 12 together with the carbide or the like carbonized by the sliding heat.

In the present embodiment, the spray ring 4 is provided between the gland packing 3 and the packing presser 6, but the present invention is not limited to this, and the spray ring 4 is provided between the adjacent gland packings 3. Is also good. In this case, the liquid sealing side member 4a of the spray ring 4 has a flat end surface on the liquid sealing side.
Tapered projections 41 are formed at predetermined intervals near the inner periphery of the end surface on the atmosphere side member 4b side. On the other hand, the atmosphere side member 4b has a flat end surface on the atmosphere side, and a tapered shape near the inner periphery of the end surface on the liquid sealing side member 4a so as to be alternately combined with the projection 41 of the liquid sealing side member 4a. Is formed. Thereby, the lubricating liquid can be efficiently supplied to each of the sliding surfaces of the gland packing 3 provided on both sides of the spray ring 4.

Further, in the present embodiment, each of the liquid sealing side member 4a and the atmosphere side member 4b of the spray ring 4 is constituted by one member. However, the present invention is not limited to this. Each of the side member 4a and the atmosphere side member 4b may be constituted by two semicircular members, and these members may be connected. Further, in the present embodiment,
The projection 41 is provided over the entire circumference of the liquid sealing side member 4 a of the spray ring 4, but is not limited to this.
There should be only one place. Further, in the present embodiment, one spray ring 4 is provided between the gland packing 3 and the packing presser 6, but the present invention is not limited to this. For example, the spray ring 4 is provided between the gland packing 3 and the packing presser 6. It is also possible to provide two or more such as one provided between the adjacent gland packings 3. Also,
As the lubricating liquid, for example, water other than lubricating oil such as silicon oil can be used.

[0013]

As described above, in the shaft sealing device according to the present invention, since the mist-like lubricating liquid introduced from the supply passage is supplied to the packing sliding surface from the spray ring portion, the gland packing and the gland packing can be prevented. The vicinity of the packing sliding surface whose temperature rises due to heat generated between the rotating shaft and the rotating shaft can be efficiently cooled. Further, lubricating properties can be given to the packing sliding surface. For this reason, the sealing performance of the shaft sealing device can be stabilized for a long time. Furthermore, the fluid that has entered the packing sliding surface and the carbide that has been carbonized by the sliding heat can be discharged from the discharge port, so that the possibility of ignition due to the sliding heat can be minimized. Also, since the lubricating liquid is supplied in the form of a mist, a large amount of lubricating liquid is not required,
It becomes difficult for the lubricating liquid to enter the fluid device. Further, since the vicinity of the packing sliding surface is efficiently cooled, even if retightening is performed, for example, when a fluid leaks, the possibility of seizure due to sliding between the gland packing and the rotating shaft is low.

When the spraying means sprays the lubricating liquid on the sliding surface over the entire circumference of the rotating shaft, the lubricating liquid is supplied to the packing sliding surface over the entire circumference of the rotating shaft. Therefore, the vicinity of the packing sliding surface can be more efficiently lubricated and cooled. Further, when the spray ring is constituted by a pair of members having a projection formed at least on one of the inner circumferences, the atomized lubricating liquid introduced from the supply path flows along the projection of the spray ring. To the packing sliding surface, and is more efficiently supplied to the packing sliding surface. In addition, when the above spray ring is arranged in the packing box on the atmosphere side from the maximum air side gland packing, the lubricating liquid is mainly supplied near the packing sliding surface of the maximum air side gland packing where the temperature tends to rise most easily. Therefore, cooling can be performed efficiently. Further, for this reason, the fluid that enters from the packing sliding surface of the gland packing on the most sealed liquid side is hard to be solidified.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a shaft sealing device according to the present invention.

FIGS. 2A and 2B are diagrams showing a spray ring used in an embodiment of the shaft sealing device according to the present invention, wherein FIG. 2A is a front view, and FIG. .

FIG. 3 is a schematic sectional view showing a conventional shaft sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft sealing device 2 Packing box 3 Gland packing 4 Spray ring 4a Sealing liquid side member 4b Atmospheric side member 41 Projection part 9 Atomization part 11 Supply path 12 Outlet 13 Tightening member 14 Spraying means

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshihisa Urakubo 1-3-3 Aoyagi, Ichihara-shi, Chiba Kanto Pillar Engineering Service Co., Ltd. (72) Inventor Satoshi Koyama 1-3-3 Aoyagi, Ichihara-shi, Chiba 13 Kanto Pillar Engineering Service Co., Ltd. F-term (reference) 3J043 AA16 BA02 DA01

Claims (4)

[Claims] 1. A shaft sealing device in which at least one gland packing is interposed between a rotating shaft and a packing box, and the gland packing is tightened in an axial direction by a tightening member, wherein the gland packing is arranged adjacent to the gland packing. A spray ring interposed between the rotating shaft and the packing box, for guiding a lubricating liquid to a sliding surface between the gland packing and the rotating shaft; and a spray ring penetrating the packing box and applying the lubricating liquid to the spray ring. A shaft seal comprising: a supply path for supplying, a spraying unit having an atomizing unit for supplying the supply path with the lubricating liquid in an atomized state, and a discharge port for discharging the lubricating liquid. apparatus. 2. The shaft sealing device according to claim 1, wherein said spraying means sprays said lubricating liquid onto said sliding surface over the entire circumference of said rotary shaft. 3. The spray ring comprises a pair of members having at least one of the one end faces formed with a projection for guiding the lubricating liquid to the sliding surface near an inner periphery thereof. The shaft sealing device according to claim 1 or 2. 4. The shaft sealing device according to claim 1, wherein the spray ring is disposed closer to the atmosphere than the gland packing.