JPS6323651Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an improvement in the rotation prevention mechanism of a mechanical seal that seals the rotating parts of various devices. This paper proposes an improvement in the means for preventing relative rotation between the two.

[Conventional technology]

Traditionally, the second type of mechanical seal has been used as an example of a mechanical seal.
The one shown in the figure is publicly known. In the figure, a is a mating ring that is held and fixed at a predetermined position on the outer periphery of the rotating shaft b by sleeves c and d and rotates together with the shaft b, and e is a fixed ring that is fixed to the non-rotating housing side (not shown). The floating sheet e is in sliding contact with the mating ring a by pressing its rear part with an elastic means f such as a bellows, and sealing the fluid at the sliding contact part g.

In this type of mechanical seal, in order to suppress relative rotation between the mating ring a and the shaft b due to sliding torque, etc., a required number of notches h are formed on the inner periphery of the mating ring a, and the shaft A notch pin i is implanted at a position corresponding to the notch h on the outer periphery of b, and the notch pin i and the notch h are engaged with each other in the circumferential direction.

[Problem that the invention attempts to solve]

However, according to the anti-rotation mechanism configured as described above, since the dowel pin i is implanted by being driven into the shaft b, deformation is likely to occur in the shaft b, and when the shaft b rotates at high speed, the centrifugal force causes the dot pin to deform. There were problems such as the case where the part i sometimes fell off in the direction of the outer diameter. In addition, in the above conventional example, since the mating ring a is fitted directly onto the outer periphery of the shaft b, it is not easy to remove the mating ring a, and even in the mounting work, it is difficult to remove the mating ring a. It is difficult to fit the mating ring a into the shaft b in the device while ensuring that the circumferential position of the dowel pin i matches the circumferential position of the notch h of the mating ring a.

[Means for solving problems]

The anti-rotation mechanism of the mechanical seal of this invention was devised to solve the above problems.
The mating ring is attached to the outer periphery of a cylindrical sleeve that is externally fixed to a predetermined position of the shaft, and the mating ring is inserted into a required number of screw holes arranged circumferentially in the mounting portion of the mating ring in the sleeve. An engaging screw is screwed into the sleeve from the inner diameter side, and the distal end of the engaging screw protruding from the outer peripheral surface of the sleeve is configured to engage with a notch formed in the inner circumference of the mating ring.

[Effect]

According to the present invention, the mating ring is not attached directly to the shaft of the device as in the past, but is attached via a sleeve, so the mating ring and sleeve are temporarily attached outside the device. After assembly, by externally fixing the sleeve to the shaft, the mating ring can be attached to a predetermined position on the outside of the shaft, and when removing the mating ring, first remove the sleeve from the shaft. Since the mating ring can be pulled out and removed outside the device, attachment and detachment becomes extremely easy. Furthermore, since the engagement screw is not driven into the shaft or sleeve in advance, but is inserted into a threaded hole drilled in the sleeve from the inner diameter side of the sleeve, centrifugal force may cause the engagement screw to erode when the device rotates at high speed. The engagement screw will not fall out, and the shaft etc. will not be deformed due to the driving of the pin as in the conventional case.

〔Example〕

Next, a preferred embodiment of the detent mechanism of the mechanical seal of the present invention will be described with reference to FIG. In the figure, 1 is a mating ring that is attached to a predetermined position on the outside of a rotating shaft 2 via a cylindrical sleeve 3 having a stepped portion 3a and rotates together with the shaft 2, and 4 is a non-rotating housing side (not shown). The floating sheet 4 and the mating ring 1 are in sliding contact with each other at their opposing end surfaces to form a fluid seal. A required number of notches 1a are formed on the inner peripheral side of the mating ring 1, and on the other hand, in the vicinity of the stepped portion 3a of the sleeve 3 into which the mating ring 1 is fitted,
A required number of screw holes 3b are arranged in the circumferential direction, and a tip portion 5a of a substantially bolt-shaped engagement screw 5 screwed into the screw hole 3b from the inside diameter side of the sleeve 3 and protruding toward the outside diameter side of the sleeve 3 is inserted into the screw hole 3b. The sleeve 3 is engaged with the notch 1a, thereby preventing relative rotation between the mating ring 1, the sleeve 3, and the shaft 2 which is integrated with the sleeve 3 by a fixing means (not shown).

According to the above configuration, the assembly is performed by first inserting the mating ring 1 into the sleeve 3 so that one end abuts against the stepped portion 3a of the sleeve 3 outside the machine, and then placing the two 1 and 3 relative to each other. The notch 1a of the mating ring 1 and the screw hole 3b of the sleeve 3 are rotated.
After temporarily assembling the sleeve 3 by inserting the engagement screw 5 into the threaded hole 3b from the inner diameter side of the sleeve 3, the sleeve 3 is externally fixed at a predetermined position in the axial direction of the shaft 2. This is completed, and its removal can be done by following the assembly procedure described above in exactly the reverse order.

[Effect of idea]

As explained above, the present invention has a structure in which the mating ring is not directly fitted onto the shaft in which the lock pin is implanted, but is attached via a sleeve having detachable engagement means, so that the mating ring Not only is it easy to assemble and remove, but it also eliminates the problems that occur in the past, such as shaft deformation due to dowel pin installation and dowel pin falling out due to centrifugal force when the equipment rotates at high speed. Therefore, the practical effects of this invention are extremely large.

[Brief explanation of the drawing]

FIG. 1 is a half-cut sectional view of the main part showing a preferred embodiment of the rotation prevention mechanism of the mechanical seal of the present invention, and FIG.
The figure is a half-cut sectional view of essential parts showing an example of a conventional mechanical seal rotation prevention mechanism. 1... Mating ring, 1a... Notch, 2
... Shaft, 3 ... Sleeve, 3b ... Screw hole, 5 ... Engagement screw.

Claims (1)

[Scope of utility model registration request] A mechanical seal that seals fluid by sliding a mating ring fixed to the rotating shaft side and a floating seat fixed to the non-rotating housing side, both of the shaft and the mating ring, In a detent mechanism that includes engaging means that engage with each other and prevents relative rotation between the two, the mating ring is attached to the outer periphery of a cylindrical sleeve that is externally fixed to a predetermined position of the shaft. At the same time, engaging screws are screwed from the inner diameter side of the sleeve into the required number of screw holes arranged circumferentially in the mounting portion of the mating ring of the sleeve, so that the mating ring protrudes from the outer peripheral surface of the sleeve. A rotation prevention mechanism for a mechanical seal, wherein the engagement screw tip portion engages with a notch formed in the inner periphery of the mating ring.