JP4393251B2 - mechanical seal - Google Patents

Description

  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.

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. 11 to 12, is a kneading tank (hereinafter referred to as “chamber 51”) that contains 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.

  The mechanical seal 60 is provided with a packing presser 62 having a mechanical seal packing 61 disposed 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.

  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.

However, when changing the kneading material, the mechanical seal 60 prevents the kneading material adhering to the vicinity of the mechanical seal packing 61 or the packing receiving portion w from being mixed with the kneading material to be changed. 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.

  In view of such problems, the present invention provides a mechanical seal that can greatly reduce the time and labor required for cleaning work when exchanging mechanical seal packing or changing kneaded materials, and can improve workability by expanding the work space. The purpose is to do.

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. It consists of a ring-shaped mechanical seal packing that comes into sliding contact, and the ring-shaped packing presser to which the mechanical seal packing is mounted is attached to the pressing means by screws so that it can be moved in a direction parallel to the axis, and the transition of the pressing means Accordingly, the mechanical seal packing is configured to be able to contact and separate from the packing receiving portion, and the pressing means pivotally supported so that the rear portion can swing in a state where the pressing means is detached from the packing presser, from the position near the shaft. The packing holder and the mechanical seal packing are retracted so that they can be moved along the shaft to a position away from the casing side wall .

  In this case, a hydraulic cylinder is used as the pressing means, and a packing presser can be connected to the tip of the piston rod of the hydraulic cylinder.

  Further, an accumulator can be incorporated in the push side circuit of the hydraulic cylinder.

  Also, a locking means for locking the mechanical seal packing in the vicinity of the packing mounting position of the pressing means and preventing the mechanical seal packing from rotating together can be provided.

  According to the mechanical seal of the present invention, the mechanical seal ring-shaped mechanical seal packing is disposed so as to be movable in a direction parallel to the shaft using the pressing means, so that it is possible to reduce the time and effort of exchanging and cleaning the mechanical seal packing. Furthermore, since the pressing means is provided so as to be detachable from the mechanical seal packing, and the rear part is pivotably supported so as to be retracted from the position near the shaft, the mechanical seal packing can be replaced. The space for the cleaning work can be expanded, and the workability can be further improved.

  Further, when a hydraulic cylinder is used as the pressing means, the mechanical seal packing can be pressed against the packing receiving portion with a sufficient pressing force, and leakage of the kneaded material kneaded inside the kneading tank can be reliably prevented. At the same time, when the rotor is rotated using a hydraulic motor, the overall apparatus can be reduced in size by using a common hydraulic tank.

  At this time, if an accumulator is incorporated in the push side circuit, it can play a cushioning role for releasing an abnormal high pressure generated inside the kneading tank.

  Further, when a locking means for locking the mechanical seal packing in the vicinity of the packing mounting position of the pressing means to prevent co-rotation of the mechanical seal packing is provided, the pressing means, particularly when a hydraulic cylinder is used as the pressing means. An excessive rotational force can be prevented from being transmitted to the cylinder rod, and the mechanical seal packing can also serve as a positioning guide that reliably contacts the packing receiving portion.

  Hereinafter, embodiments of a mechanical seal of the present invention will be described with reference to the drawings.

  FIGS. 1-1, 1-2, and 2 are partial cross-sectional views 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.

The mechanical seal 1 of the present embodiment is a mechanical seal 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 is a ring-shaped packing disposed on the flange portion of the rotor drive shaft 54. A receiving part w and a packing presser 3 provided with a ring-shaped mechanical seal packing 2 in sliding contact with the packing receiving part w are provided.
The mechanical seal 1 has a packing retainer 3 to which a mechanical seal packing 2 is mounted mounted on a pressing means 4 such as a hydraulic cylinder 11 that can move in a direction parallel to the rotor drive shaft 54. Accordingly, the mechanical seal packing 2 is configured so as to be able to contact and separate from the packing receiving portion w, and the pressing means 4 is provided so as to be able to be detached from the packing presser 3 and the rear portion is pivotably supported so as to be able to swing. It is provided so as to be retracted from the position near.
FIG. 1-1 shows a state where the upper half of the mechanical seal 1 is pulled away 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.

Inner diameter side and a U-shaped recess 3a is formed in a flange outer peripheral end of the mechanical seal packing 2 is ring-shaped, which is mounted gland 3, fitting the small diameter threaded portion of the distal end of the piston rod 11a in the recess 3a The piston rod 11a is connected to the packing retainer 3 by tightening the nut 11c (see FIGS. 1-2 (C-1) to (C-2)).
In addition, as shown in FIGS. 1-1 and FIGS. 1-2 (A-1) to (A-2), the piston rod 11a is fitted into the packing presser 3 to be engaged 3 ′, or FIG. B-1) ~ (When B-2) stepped nut 11c as shown in advance so as to 'the stepped portion of the engaging 3 fitted into the gland 3', the nut range engaged slow'm at is also advantageous because not result in out-of-joint.

The rear portion of the hydraulic cylinder 11 is pivotally supported by a hinge 81 on the bearing portion 8 of the rotor drive shaft 54.
When the piston rod 11 a of the hydraulic cylinder 11 is removed from the packing presser 3, the hydraulic cylinder 11 is rotated around the hinge 81 so that it can be retracted radially outward from a position near the rotor drive shaft 54. Yes.
Further, a rotary joint 11b is used in the piping of the hydraulic cylinder 11, thereby facilitating the swinging of the hydraulic cylinder 11.

On the other hand, 5 indicates a locking member that is protruded in parallel with the rotor drive shaft 54 at two locations in the diameter 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. When the mechanical seal packing 2 is pressed against the ring-shaped packing receiving portion w attached to the flange portion s of the rotor R, the mechanical seal packing 2 is inserted into the positioning hole 7 formed in the packing retainer 3, and the mechanical seal packing 2 is shared with the rotation of the rotor R. Prevent turning around.
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.
Further, as shown in FIG. 4, the pressing means 4 and the positioning hole 7 are arranged at two places facing the circumference, but the present invention is not limited to this, and the pressing means 4 and the positioning holes 7 may be arranged at three or more places. Absent.

  As shown in FIG. 9, if the rear portion of the hydraulic cylinder 11 is connected to the free end of the C-shaped link 8 </ b> A supported by the bearing portion 8 of the rotor drive shaft 54 by a hinge 81, the hydraulic cylinder is provided. 11 can be retracted further than the maintenance area of the mechanical seal 1.

Next, operation | movement of the mechanical seal 1 of this invention is demonstrated 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, Supply to the rod side chamber, extend the piston rod 11a, push the packing presser 3 with the mechanical seal packing 2 attached to the tip, and slide the outer surface of the mechanical seal packing 2 against the packing guide 6 while the end surface of the rotor R Is pressed against the packing receiving portion w.
AC in the hydraulic circuit indicates an accumulator. This accumulator AC is a cushion that releases the abnormal high pressure caused by the piston rod 11a of the hydraulic cylinder 11 being pushed back by the deflection of the rotor shaft R during kneading or the surface wobbling of the packing receiving portion w due to the backlash of the bearing. Play a role.
Further, when the pressure change occurs due to the oil temperature rise accompanying the performance of the kneading operation or the kneading under the heating condition, when a pressure abnormality that cannot be absorbed by the accumulator AC occurs, the hydraulic circuit shown in FIG. Thus, after starting the hydraulic pump, the pressure oil is supplied to the anti-rod side chamber R of the hydraulic cylinder by switching the valves V1 and V2, and the abnormal pressure is eliminated (the pressure in the anti-rod side chamber R is reduced by the pressure reducing valve V3). (Return to the pressure set in step 1).

  In the above-described configuration, the mechanical seal 1 is attached to the packing receiving portion w in which the mechanical seal packing 2 is attached to the flange portion s of the rotor R by the pressing means 4 including the hydraulic cylinder 11 and the like before the kneading material is put into the kneading apparatus 10. The rotor driving shaft 54 is rotated by driving means (not shown), and the kneaded material is kneaded by the rotation of the rotor R connected to the rotor driving shaft 54.

  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.

In such a case, as shown in the upper half of FIG. 1-1, 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 returned.
Then, after loosening the nut at the tip of the piston rod 11a and extracting the small diameter thread portion from the U-shaped recess 3a of the packing retainer 3, the hydraulic cylinder 11 is swung around the hinge 81 as shown in FIG. Then, it is retracted about 90 ° in the radially outward direction from the position near the rotor drive shaft 54.

As a result, the packing retainer 3 and the mechanical seal packing 2 are largely separated from the end surface of the rotor R, so that the kneaded material adhering to the tip 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.
Furthermore, by retracting the hydraulic cylinder 11 from the position in the vicinity of the rotor drive shaft 54, the space for exchanging the mechanical seal packing 2 and cleaning work can be expanded, and workability can be further improved.

  Next, another embodiment of the mechanical seal of the present invention shown in FIGS. 6 to 8 will be described.

  In this mechanical seal 1, as a pressing means, a long hole 14 ′ is formed in a circumferential direction at appropriate positions 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.

  Reference numeral 15 denotes a guide pole that is slidably inserted into a guide hole 16 that is opened at an appropriate position (two locations in the diametrical direction in the figure) of the packing presser 3. By this guide pole 15, the packing presser 3 is attached to the rotor drive shaft. The rotor drive shaft 54 moves in the axial direction while maintaining a right angle with respect to the head 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.

Reference numeral 17 denotes a cylinder joint that connects the tip of the piston rod 11 a of the cylinder 11 to the pressing plate 13.
The cylinder joint 17 is connected using a pin 17 a arranged in parallel with the plate support 18 so that the pressing plate 13 can rotate around the plate support 18.
As shown in FIG. 7B, if the pressing pin 14 is a threaded pressing pin 14a, the pressing plate 13 and the packing retainer 3 can be separated by screw operation, so that the mechanical seal packing 2 is largely separated from the end surface of the rotor R. Convenient to.

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.
The hydraulic cylinder 11 is fitted with a mechanical seal packing 2 via the pressing plate 13 and the packing gland 3 on the tip of the piston rod 11a, leaves the pressure plate 13 by removing the pin 17 a of the cylinder joint 17 be able to.
The rear portion of the hydraulic cylinder 11 is pivotally supported by the bearing portion 8 of the rotor drive shaft 54 so as to be swingable by a hinge 81, and can be retracted radially outward from a position near the rotor drive shaft 54 around the hinge 81. ing.
A rotary joint 11b is used for the piping of the hydraulic cylinder 11, thereby facilitating the swinging of the hydraulic cylinder 11.

  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. be able to.

The mechanical seal of the present invention has a characteristic of greatly reducing the time and labor required for the cleaning work when exchanging the mechanical seal packing or changing the kneading material, and is suitable for, for example, the use of a mechanical seal of a kneader. Can be used.

The principal part of the mechanical seal of this invention is shown, (A) is the partial cross section figure, (B) is an enlarged view of Y part of (A). The connection part (The enlarged view of X part of FIG. 1 (A)) of the piston rod and packing presser of a hydraulic cylinder is shown, (A-1) is a partial cross section figure, (A-2) is (A-1). (B-1) is a partial cross-sectional view of a different embodiment, (B-2) is a cross-sectional view of a B-line of (B-1), and (C-1) is a cross-sectional view of a different embodiment. Partial cross-sectional view, (C-2) is a cross-sectional view taken along line C of (C-1). It is a partial cross section figure of a mechanical seal which shows the state where the hydraulic cylinder was rocked. It is a partial expanded sectional view of the mechanical seal of this invention. It is a front view of the mechanical seal of the present invention. It is a hydraulic circuit diagram which operates the mechanical seal of this invention. It is a partial cross section figure which shows the principal part of another mechanical seal of this invention. FIG. 7 is a partially cutaway sectional view taken along line XX in FIG. 6, (A) is an overall view, and (B) is a partially enlarged sectional view. It is a hydraulic circuit diagram which operates another mechanical seal of the present invention. It is explanatory drawing of the different Example which shows the attachment structure of the press means of this invention. It is a hydraulic circuit diagram which operates the mechanical seal of this invention. It is a partial cross section figure which shows the principal part of the conventional mechanical seal. It is front sectional drawing of a kneading apparatus.

DESCRIPTION OF SYMBOLS 1 Mechanical seal 2 Mechanical seal packing 3 Packing presser 4 Pressing means 5 Locking means 6 Packing guide 7 Positioning hole 8 Bearing part 81 Hinge 11 Hydraulic cylinder 11a Piston rod 11b Rotary joint 12 Push side circuit AC Accumulator w Packing receiving part

Claims (4)

A mechanical seal of a shaft portion penetrating the casing side wall and protruding out of the casing, comprising: a ring-shaped packing receiving portion disposed on the shaft; and a ring-shaped mechanical seal packing slidably contacting the packing receiving portion, the mechanical seal packing Attach the ring-shaped packing retainer with a screw to the pressing means so that it can move in the direction parallel to the shaft, and the mechanical seal packing can be brought into and out of contact with the packing receiving part as the pressing means moves. In the state where the pressing means is separated from the packing presser, the pressing means pivotally supported so that the rear portion can swing is retracted from the position near the shaft , and the packing presser and the mechanical seal packing are moved along the shaft. A mechanical seal characterized by being movable to a position away from the side wall .   2. The mechanical seal according to claim 1, wherein the pressing means uses a hydraulic cylinder, and a packing presser is connected to the tip of the piston rod of the hydraulic cylinder.   3. The mechanical seal according to claim 2, wherein an accumulator is incorporated in the push side circuit of the hydraulic cylinder.   4. The mechanical seal according to claim 1, 2, or 3, further comprising a locking means that is locked to the side wall of the casing in the vicinity of the packing mounting position of the pressing means and prevents co-rotation of the mechanical seal packing.

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