JP4293778B2 - mechanical seal - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mechanical seal of a rotating shaft portion, and more particularly to a mechanical seal used in a kneading apparatus or the like.
[0002]
[Prior art]
A kneading apparatus 50 that uses a mechanical seal of a shaft portion that penetrates a casing side wall and protrudes out of the casing, as shown in FIGS. 8 to 9, is a kneading tank (hereinafter, referred to as “chamber 51”) that contains a kneaded material. And a rotor drive shaft 54 that penetrates the side wall 52 of the chamber 51 at both ends, is connected to the rotor drive shaft 54, and kneads the kneaded material in the chamber 51, and a pressure lid 55. When kneading the kneaded material, the kneaded material is put into the chamber 51 by an appropriate means with the pressure lid 55 opened upward, and the pressure lid 55 is lowered and connected to the rotor drive shaft 54. The kneaded material is kneaded by rotating the rotor R by driving means such as a motor.
The rotor drive shaft 54 that is a pair may be a driven shaft on the other side by using a coupling means such as a gear.
[0003]
The mechanical seal 60 is provided with a packing holder 62 provided with a mechanical seal packing 61 on the entire periphery of the packing guide 66 attached to a receiving member 53 provided in the vicinity of the through hole of the rotor drive shaft 54 of the side wall 52 via a bolt 63. And fix.
[0004]
Then, the nut 64 is tightened and pressed by the spring force of the spring 65, and the end surface of the mechanical seal packing 61 is moved to the flange portion s of the rotor R while the outer peripheral surface of the mechanical seal packing 61 is brought into sliding contact with the inner peripheral surface of the packing guide 66. The kneading material kneaded in the chamber 51 is prevented from leaking to the outside by being pressed against the wear ring plate w (hereinafter referred to as “packing receiving portion w”) attached to.
[0005]
[Problems to be solved by the invention]
However, when the kneading material is changed, the mechanical seal 60 prevents the kneading material adhering to the vicinity of the mechanical seal packing 61 and the packing receiving portion w from being mixed with the kneading material to be changed, and the rotor R, the mechanical seal packing 61, It is necessary to remove the packing receiving portion w during maintenance work or replacement work due to wear.
Such replacement work has problems such as loosening the nut 64, removing all of the spring 65, the packing retainer 62, and the packing guide 66, and reassembling after cleaning or replacement.
[0006]
The present invention has been made in view of such problems, and an object thereof is to provide a mechanical seal capable of greatly reducing the time and labor required for cleaning work when exchanging the mechanical seal packing or changing the kneaded material.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a mechanical seal of the present invention includes a ring-shaped packing receiving portion disposed on a shaft in a mechanical seal of a shaft portion that penetrates a casing side wall and protrudes out of the casing, and the packing receiving portion. more becomes sliding contact ring of the ring-shaped mechanical seal packing fixed to gland, the gland, mounted on the tip of the piston rod of the hydraulic cylinder for extending action in the axial direction parallel to the extending action of the hydraulic cylinder Along with this, the mechanical seal packing is pressed from the state separated from the packing receiving portion , and the shaft is rotated by the driving means in that state, and a plurality of locking members are formed on the casing side wall so as to protrude parallel to the shaft. And a locking means comprising a positioning hole into which the locking member opened in the packing presser is inserted , And incorporating this and said accumulator to push side circuit of the hydraulic cylinder.
[0008]
In the present invention having the above-described configuration, the ring-shaped mechanical seal packing fixed to the ring-shaped packing retainer of the mechanical seal is attached to the tip of the piston rod of the hydraulic cylinder that extends in the direction parallel to the shaft. Since it is arranged so as to be movable in the direction parallel to the shaft, the mechanical seal packing can be easily replaced and cleaned.
In addition, the locking means prevents the mechanical seal packing from co-rotating, prevents the mechanical seal packing from adhering to the packing receiving portion and prevents excessive rotational force from being transmitted to the hydraulic cylinder , and serves as a positioning guide for the packing retainer. Can be moved in the axial direction while always maintaining a right angle with respect to the shaft, and the mechanical seal packing can be brought into contact with the packing receiving portion uniformly and reliably.
[0009]
Then, in particular, more to secure the mechanical seal packing through the packing gland on the tip of the piston rod of the hydraulic cylinder, a mechanical seal packing in the packing receiving portion can be pressed with sufficient pressure, it is kneaded within the kneading vessel Thus, leakage of the kneaded material can be reliably prevented.
[0010]
Also, more the incorporation of accumulator on the pushing side circuit of the hydraulic cylinder, can cushion role to release an abnormal pressure caused by the hydraulic cylinder is pushed back.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a mechanical seal of the present invention will be described with reference to the drawings.
[0012]
FIG. 1 is a partial cross-sectional view showing the main part of the mechanical seal of the present invention. The same reference numerals are given to the same components as those in the conventional example, and the description thereof is omitted.
[0013]
The mechanical seal 1 of the present invention has a ring-shaped packing retainer 3 at the tip of the pressing means 4 comprising the hydraulic cylinder 11 on the circumference of a rotor drive shaft 54 that penetrates the casing side wall 52 of the kneading device 10 and protrudes out of the casing. And a ring-shaped mechanical seal packing 2 fixed by fixing means such as bolts, and a ring-shaped packing receiving portion w disposed on the flange portion of the rotor drive shaft 54.
FIG. 1 shows a state where the upper half of the mechanical seal 1 is separated from the end face of the rotor R, and shows a state where the lower half of the mechanical seal 1 is pressed against the end face of the rotor shaft R.
[0014]
Reference numeral 5 denotes a locking member that protrudes in parallel with the rotor drive shaft 54 at two locations in the diametrical direction from the packing guide 6 provided in the vicinity of the penetration hole of the rotor drive shaft 54 of the casing side wall 52. 2 is inserted into the positioning hole 7 formed in the packing retainer 3 when the ring 2 is pressed against the ring-shaped packing receiving portion w attached to the flange portion s of the rotor R, and the mechanical seal packing 2 rotates together with the rotation of the rotor R. To prevent that.
As shown in the illustrated example, the packing receiving portion w is configured such that a ring-shaped plate material is fitted into a concave annular groove formed in the flange portion s of the rotor R, and the surface of the flange portion s is directly polished. You may comprise so that the pressure seal of the mechanical seal packing 2 may be received.
The locking member 5 is preferably formed to have a pointed tip so that it can be easily inserted into the positioning hole 7.
Further, the locking member 5 may be one that is always engaged with the packing presser 3 in the stroke range of the hydraulic cylinder 11.
Furthermore, as shown in FIG. 3, the pressing means 4 and the positioning hole 7 are provided in two locations facing each other on the circumference. However, the present invention is not limited to this, and the configuration may be such that three or more locations are provided. I do not care.
[0015]
Next, the operation of the mechanical seal 1 of the present invention will be described based on the hydraulic circuit diagram shown in FIG.
Prior to the operation of the kneading apparatus 10, the mechanical seal 1 of the present invention drives the electric motor M, and the pressure oil from the hydraulic pump P passes through the oil passage P 1, the electromagnetic switching valve V, and the push-side circuit 12, The rod is supplied to the rod side chamber, the piston rod is extended, the packing presser 3 having the mechanical seal packing 2 attached to the tip is pushed, and the mechanical seal packing 2 is brought into sliding contact with the packing guide 6 on the outer peripheral surface of the end surface of the rotor R. It is pressed against the packing receiving part w.
AC in the hydraulic circuit indicates an accumulator. This accumulator AC is a cushion type that releases the abnormal high pressure generated by the hydraulic cylinder being pushed back due to deflection of the rotor shaft R during kneading, defective processing of the packing receiving portion w, or swinging of the packing receiving portion w due to bearing play, etc. Play a role.
[0016]
In the above structure, the mechanical seal 1, before introducing the kneaded material in the kneading apparatus 10, the hydraulic cylinder 11 or Ranaru pressing means, pressing a mechanical seal packing 2 in the packing receiving portion w that is attached to the flange portion s of the rotor R Then, the rotor drive shaft 54 is rotated by drive means (not shown), and the kneaded material is kneaded by the rotation of the rotor R connected to the rotor drive shaft 54.
[0017]
When it is necessary to change the kneading material after the kneading operation is finished, the kneading material adhering to the vicinity of the mechanical seal packing 2 and the packing receiving portion w may adversely affect the product quality of the kneaded material after the change as contamination of the kneaded material after the change. When the mechanical seal packing 2 is deteriorated due to cleaning to prevent the wear or the mechanical seal packing 2 from being worn or the like, it is necessary to replace the mechanical seal packing 2.
[0018]
In such a case, the electromagnetic switching valve V is switched, pressure oil from the pump P is supplied to the cylinder rod side chamber, and the hydraulic cylinder 11 is made to go backward (upper state in FIG. 1).
[0019]
As a result, the packing retainer 3 and the mechanical seal packing 2 are largely separated from the end face of the rotor R, so that the kneaded material adhering to the front end of the mechanical seal packing 2 and the vicinity of the packing receiving portion w and the replacement of the mechanical seal packing 2 are simple and short. Can be done in time.
[0020]
Next, a reference example of the mechanical seal shown in FIGS. 5 to 7 will be described.
[0021]
In this mechanical seal 1, as a pressing means, a long hole 14 ′ is formed in the circumferential direction at an appropriate place on the circumferential side surface of the packing retainer 3 (two positions facing each other in the figure), and a half circumference of the packing retainer 3 is formed in the long hole 14 ′. A pressing pin 14 attached to the tip of a substantially U-shaped pressing plate 13 configured to surround is inserted and configured.
[0022]
Reference numeral 15 denotes a locking member (guide pole) that is slidably inserted into a positioning hole (guide hole) 16 that is opened at an appropriate position (two locations in the diameter direction in the illustrated example) of the packing retainer 3. The guide retainer 15 causes the packing retainer 3 to move in the axial direction of the rotor drive shaft 54 while always maintaining a right angle to the rotor drive shaft 54. As a result, the mechanical seal packing 2 can be uniformly brought into contact with the packing receiving portion w, and when the mechanical seal packing is pressed against the packing receiving portion w attached to the flange s of the rotor R, the rotation of the rotor R is accompanied. It is possible to prevent the mechanical seal packing 2 from rotating together.
[0023]
Reference numeral 17 denotes a cylinder joint that connects the tip of the cylinder 11 to the pressing plate 13.
The cylinder joint 17 is connected using a pin so that the pressing plate 13 can rotate around the plate support 18.
[0024]
In the above configuration, the pressing force of the cylinder 11 serving as the pressing means 4 is transmitted to the pressing plate 13 via the cylinder joint portion 17, and the pressing plate 13 moves in a pendulum manner with the plate support portion 18 as an axis. The presser 3 moves in the axial direction of the rotor drive shaft 54, and the mechanical seal packing 2 moves so as to be able to contact and separate from the packing receiving portion w.
[0025]
The mechanical seal of the present invention has been described above based on the embodiments thereof. However, the present invention is not limited to the configurations described in the above embodiments, and the configurations are appropriately changed without departing from the spirit of the present invention. It is something that can be done.
[0026]
【The invention's effect】
As described above, according to the present invention, the ring-shaped mechanical seal packing fixed to the ring-shaped packing retainer of the mechanical seal is attached to the tip of the piston rod of the hydraulic cylinder that extends in the direction parallel to the shaft. Since it is arranged so as to be movable in the direction parallel to the shaft, it is possible to greatly reduce the labor and time of exchanging mechanical seal packing and cleaning work.
In addition, the locking means prevents the mechanical seal packing from co-rotating, prevents the mechanical seal packing from adhering to the packing receiving portion and prevents excessive rotational force from being transmitted to the hydraulic cylinder , and serves as a positioning guide for the packing retainer. Can be moved in the axial direction while always maintaining a right angle with respect to the shaft, and the mechanical seal packing can be brought into contact with the packing receiving portion uniformly and reliably.
[0027]
In particular, by fixing the mechanical seal packing to the tip of the piston rod of the hydraulic cylinder via a packing presser, the mechanical seal packing can be pressed against the packing receiving portion with a sufficient pressing force, and is kneaded inside the kneading tank. Thus, leakage of the kneaded material can be reliably prevented .
[0028]
Further, by incorporating the accumulator to the pushing side circuit, it can cushion role to release an abnormal pressure generated within the kneading tank.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view showing a main part of a mechanical seal of the present invention.
FIG. 2 is a partially enlarged sectional view of the mechanical seal of the present invention.
FIG. 3 is a front view of the mechanical seal of the present invention.
FIG. 4 is a hydraulic circuit diagram for operating the mechanical seal of the present invention.
5 is a partial cross-sectional view showing a main portion of a reference example of main Kanikarushiru.
6 is a partially cut cross-sectional view taken along line XX in FIG.
FIG. 7 is a hydraulic circuit diagram for operating a mechanical seal of a reference example .
FIG. 8 is a partial cross-sectional view showing a main part of a conventional mechanical seal.
FIG. 9 is a front sectional view of the kneading apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Mechanical seal 2 Mechanical seal packing 4 Pressing means 5 Locking member (locking means)
7 Positioning hole (locking means)
11 Hydraulic cylinder 12 Push side circuit AC accumulator w Packing receiving part

Claims (1)

A shaft-shaped mechanical seal that passes through the side wall of the casing and protrudes out of the casing, and a ring-shaped mechanical seal that is fixed to a ring-shaped packing holder disposed on the shaft and a ring-shaped packing retainer that is in sliding contact with the packing receiver. The packing holder is attached to the tip of the piston rod of a hydraulic cylinder that extends in a direction parallel to the shaft, and the mechanical seal packing is separated from the packing receiving part as the hydraulic cylinder extends. The shaft is rotated by the driving means in that state, and a plurality of locking members formed to protrude in parallel with the shaft on the casing side wall and the locking member opened to the packing presser are inserted. disposed locking means comprising a positioning hole to be, accumulator to push side circuit of the hydraulic cylinder Mechanical seal and incorporating this and features.

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