JPH0854065A - Rotary shaft seal device in fluid tank - Google Patents

Abstract

PURPOSE:To reliably prevent production of a gap between a rotary shaft and a ring packing even when a rotary shaft effects eccentric rotation due to a coaxial error between a rotary shaft and a bearing and bending of the rotary shaft. CONSTITUTION:An annular recessed part 8 is formed in the inner surface of a cylinder body having a tip and a rear end with which respective flanges are formed integrally and a packing 9 is mounted therein. A packing holder 4 having an O-ring 11 mounted in an annular groove 10 formed in the outer surface of the rear end flange is inserted in a rotary shaft 2 protruded from a fluid tank 1. A rear end flange 7 is positioned facing the outer surface of a fluid tank, a sleeve 13 is inserted in a bolt and brought into contact with the flange of the bolt. A hole having diameter larger than that of the sleeve is formed in the rear end flange and the bolt with a sleeve is inserted therethrough, and the O-ring is pressed at a constant pressure. A gap movable along with eccentric rotation of the rotary shaft is provided between the outer surface of the rear end and the outer surface of the fluid tank. The tip of a seal plate with a flange is inserted through the tip of the annular recessed part, the outer end flange of the packing holder and a seal plate flange are fixed together by means of a bolt and a nut. The ring packing is pressed at a constant pressure, and the ring packing is forced into pressure contact with the rotary shaft at a constant pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary shaft seal device which penetrates a fluid tank for water, oil, dust, powder, sludge or the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
A through hole 102 through which the rotary shaft 101 is inserted, and a boss portion 104 in which an annular recess 103 is formed from the outer end toward the through hole 102.
Are fixed by welding, and ring packing 1 is inserted into the annular recess 103.
05 is inserted, and the packing pressing member 106 with a collar is inserted from the outside.
106a of the packing pressing member 106 with the collar
A rotary shaft sealing device in a fluid tank is known in which a bearing 107 and a bearing 104 are fixed by a bolt 107 and a nut 108, the ring packing 104 is pressed with a constant pressure, and the ring packing 103 is pressed against the rotary shaft 101 with a constant pressure. Is.

[0003]

By the way, in the above-mentioned prior art, it is extremely difficult to coaxially support the bearing 109 supporting the rotating shaft 101 and the boss portion 104, and the rotating shaft is also difficult. Ring packing 1 due to bending of 101
The rotating shaft 101 is eccentrically rotated in 05, and a gap is created between the ring packing 105 and the rotating shaft 101, so that the fluid tank 100
There was a problem that more liquid leaked.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems by forming an annular recess on the inner surface of a cylinder integrally formed with a collar at the front and rear ends from the front end toward the rear end. Insert the ring packing into which the ring groove is formed on the outer surface of the rear flange and insert the packing holder into which the O-ring is attached to the rotating shaft protruding from the fluid tank so that the rear flange and the outer surface of the fluid tank face each other.
Insert the sleeve into the bolt and make contact with the flange of the bolt, form a hole with a larger diameter than the sleeve in the rear end flange and insert the bolt with sleeve, insert the bolt into the screw hole of the fluid tank and put the sleeve on the outer surface of the fluid tank. The O-ring is pressed and fixed with a constant pressure until it abuts, and there is provided a gap between the outer surface of the rear end flange and the outer surface of the fluid tank that can be moved due to the eccentric rotation of the rotating shaft. The outer end flange of the packing holder and the seal plate flange are fixed with bolts and nuts, the ring packing is pressed with a constant pressure, and the ring packing is pressed against the rotating shaft with a constant pressure.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, one embodiment of the present invention shown in FIGS. 1 to 3 will be described in detail. Reference numeral 1 is a fluid tank for stirring sludge, and stirring blades 3 are sequentially attached to a rotating shaft 2 in a spiral shape. Four
Is a packing holder in which a tip flange 6 is integrally formed at the tip of the cylinder 5 and a rear flange 7 is integrally formed at the rear end, and an annular recess 8 is formed on the inner surface of the cylinder 5 from the tip toward the rear end to form the ring packing 9 A book is attached, an annular groove 10 is formed on the outer surface of the rear end collar 7, and an O-ring 11 is attached. The packing holder 4 is attached to the rotary shaft 2 protruding from the fluid tank 1, the rear end flange 7 and the outer surface of the fluid tank 1 are opposed to each other, and a sleeve 13 of a certain length is inserted into the bolt 12 to attach it to the flange 14 of the bolt 12. Abut, rear end collar 7
A hole 15 having a diameter larger than the outer diameter of the sleeve 13 is formed in the sleeve 12, the bolt 12 with the sleeve is inserted, the bolt 12 is fastened to the screw hole of the fluid tank 1, and the tip of the sleeve 13 is brought into contact with the outer surface of the fluid tank 1 to make the O-ring. 11 is pressed with a constant pressure to form the annular recess 8
Insert the tip of the collar-equipped seal plate 16 from the tip, and attach the collar 1 of the packing holder tip collar 6 and the collar-attached seal plate 16
7 are fixed with bolts 18 and nuts 19, the ring packing 9 is pressed with a constant pressure, and the ring packing 9 is pressed against the rotating shaft 2 with a constant pressure. The central hole 7a of the rear end collar 7 has a diameter larger than that of the rotary shaft 2, and a gap 20 corresponding to the eccentricity of the rotary shaft 2 is formed between them. Fluid tank 1 for inserting the rotary shaft 2
The hole 21 has a larger diameter than the outer diameter of the rotary shaft 2, and a gap 22 corresponding to the eccentricity of the rotary shaft 2 is formed therebetween.
Further, a gap portion 23 corresponding to the eccentricity of the rotary shaft 2 is formed between the sleeve 13 and the central hole 7a of the rear end collar 7 of the packing holder 4. Further, a gap portion 24 is formed between the outer surface of the rear end collar 7 of the packing holder 4 and the outer surface of the fluid tank 1.

Next, the operation will be described. The liquid in the fluid tank 1 flows out of the fluid tank 1 through the gap 22 on the outer circumference of the rotating shaft 2 and flows toward the O-ring 11, but is prevented from flowing out of the O-ring 11. Further, the ring packing 9 tries to flow outward from the gap between the center hole 7a of the rear end collar 7 of the packing holder 4 and the rotary shaft 2 along the rotary shaft direction.
To prevent the outflow. If the rotating shaft 2 is not bent or coaxial with the bearing, the rotating shaft 2 rotates eccentrically. This time,
A gap 23 is formed between the inner surface of the center hole 7a of the rear end collar 7 of the packing holder 4 and the sleeve 13, and the rotary shaft 2
A gap 22 is formed between the opening 21 and the hole 21 of the fluid tank 1, and a gap 20 is formed between the center hole 7a of the rear end collar 7 and the rotary shaft 2 and the outer surface of the rear end collar 7 is formed. Since the gap 24 is formed between the outer surface of the fluid tank 1 and the eccentric rotation of the rotary shaft 2, the rotary shaft 2 and the ring packing 9 rotate integrally, and the ring packing 9 is eccentrically in the radial direction. As the packing holder 4 moves, the packing holder 4 is pressed in the radial direction, and is moved in the gap 24 by being pressed by the cushion of the O-ring 11, so that the rotating shaft 2 and the ring packing 9 move integrally. There is no gap between the shaft 9 and the rotary shaft 2, and no liquid leaks from this portion. That is, the packing holder 4 includes the gap 24 between the rotary shaft 2 and the central hole 7a, the outer periphery of the sleeve 13 and the hole 23, and the gap 24 between the outer surface of the rear end collar 7 and the outer surface of the fluid tank 1. Inside, it floats according to the eccentricity of the rotating shaft 2. The cushion pressure with the O-ring when floating is determined by the length of the sleeve 13 below the collar.

[0007]

According to the present invention, an annular recess is formed on the inner surface of a cylinder having integrally formed flanges at the front and rear ends from the front end toward the rear end, and a ring packing is mounted on the outer surface of the rear end collar. Insert the packing holder with the O-ring attached to the rotary shaft protruding from the fluid tank so that the rear end collar and the outer surface of the fluid tank face each other, and insert the sleeve into the bolt to abut the collar of the bolt,
A hole with a diameter larger than that of the sleeve is formed in the rear end flange, the bolt with sleeve is inserted, and the bolt is tightened and fixed in the screw hole of the fluid tank until the sleeve contacts the outer surface of the fluid tank, and the O-ring is pressed with a constant pressure. Then, a gap is provided between the outer surface of the rear end flange and the outer surface of the fluid tank that can move with the eccentric rotation of the rotating shaft, and the end of the seal plate with a flange is inserted from the end of the annular recess, and the outer end flange of the packing holder and the seal plate flange are Is fixed with bolts and nuts, the ring packing is pressed with a constant pressure, and the ring packing is pressed against the rotating shaft with a constant pressure, so the ring packing of the rotating shaft always rotates even if the rotating shaft is eccentrically rotated. Since it rotates integrally with the shaft, it is possible to reliably prevent the liquid from leaking due to a gap between the rotating shaft and the ring packing.

[Brief description of drawings]

FIG. 1 is a front view showing an internal structure for cutting a pressure portion of an entire apparatus to which an embodiment of the present invention is applied.

FIG. 2 is an enlarged front sectional view of a portion A of FIG.

FIG. 3 is a right side view of FIG.

FIG. 4 is a front sectional view of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluid tank 2 Rotating shaft 4 Packing holder 5 Cylindrical body 6 Tip flange 7 Rear edge flange 8 Annular recess 9 Ring packing 10 Ring groove 11 O-ring 13 Sleeve 15 hole 16 Seal plate with flange 17 Tsuba 20, 22, 23, 24 Gap Department

Claims (1)

[Claims] 1. A ring packing is formed by forming an annular recess from the front end toward the rear end on the inner surface of a cylinder integrally formed with a flange at the front and rear ends, and forming an annular groove on the outer surface of the rear end flange. Insert a packing holder equipped with an O-ring into the rotating shaft protruding from the fluid tank, make the rear end collar and the outer surface of the fluid tank face each other, insert the sleeve into the bolt and contact the flange of the bolt, and attach the sleeve to the rear end collar from the sleeve. A large diameter hole is formed and a bolt with a sleeve is inserted, the bolt is tightened and fixed in the screw hole of the fluid tank until the sleeve contacts the outer surface of the fluid tank, and the O-ring is pressed with a constant pressure. And a fluid tank outer surface with a gap that can be moved due to eccentric rotation of the rotation shaft, insert the end of the flanged seal plate from the end of the annular recess, and fix the packing holder outer end flange and the seal plate flange with bolts and nuts. Ring packing Is a rotary shaft sealing device in a fluid tank in which the ring packing is pressed against the rotary shaft at a constant pressure.