JPS6323655Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is an engagement pin used in a mechanical seal that is interposed between the housing of various devices and a rotating shaft to prevent fluid leakage. Regarding improvements.

[Conventional technology]

Conventionally, engagement pins as shown in FIGS. 4 to 6 have been used as an engagement mechanism for mechanical seals.

First, in FIG. 4, reference numeral 1 denotes an engagement notch 4 formed on the outer circumference of the fixed sliding ring 2 of the fixed side member 3 in order to prevent the fixed sliding ring 2, which is a component of the mechanical seal, from rotating. This is a dowel pin implanted in a direction parallel to the rotation axis (not shown) at a location corresponding to the rotation axis (not shown). The knock pin 1 is a shaft with a circular cross section, and on the other hand, the inner wall 4' of the engagement notch 4, which engages with the knock pin 1 so as to be movable in the axial and radial directions, is flat, so that both 1 , 4' are in contact almost on a straight line.

Next, in FIG. 5, a cap 5a made of Teflon material or the like is attached to the main body 1a to prevent wear of the knock pin main body 1a.
In Fig. 6, in order to prevent wear of the drive pin main body 1b for transmitting rotational torque to a rotating member such as a rotating sliding ring (not shown), the shaft portion 1b' of the main body 1b is coated with Teflon. It has a cylindrical sleeve 5b made of a material or the like and is wrapped around it.

[Problem that the invention attempts to solve]

However, in the case of the above-mentioned engagement pin, for example in the case shown in FIG. Torque due to the sliding of ring 2 is concentrated at the contact portion, and together with vibrations caused by the drive of the equipment, the contact portion has the disadvantage of being easily worn out. If it is made of silicon (silicon carbide) material, etc., the inner wall 4' of the engagement notch may be damaged, such as a chip, due to the impact of the collision with the knock pin 1 during assembly and operation. It was easy to cause this. Furthermore, in the examples shown in FIGS. 5 and 6, although the wear of the knock pin body 1a and the drive pin body 1b is suppressed, the cap 5a and the sleeve 5b have almost no buffering function, and furthermore, their outer shape is circular. Since they are columnar, the cap 5a and sleeve 5b are in contact with the mating engagement means almost in a straight line, as in the example shown in FIG. I was getting used to it.

The present invention was devised in view of the above-mentioned problems, with the aim of preventing the main body of the engagement pin from being worn out, as well as preventing the mating member from being damaged by wear and impact.

[Means for solving problems]

In order to achieve the above object, the present invention provides an engagement device that is implanted in one member and formed in the other member for the purpose of mutually engaging the constituent members of a mechanical seal or between the constituent members and other members. The engagement pin that engages with the coupling means is composed of a pin body and an exterior material made of a cushioning material that is externally fitted onto the pin body and has a polygonal columnar outer shape.

[Action]

According to the above structure, since the pin body is covered with the exterior material, wear of the pin body is prevented, and since the exterior material is made with a cushioning material, it has a cushioning effect, i.e. It has the effect of softening the impact of collision between the engaging pin and the mating engagement means when the mechanical seal is assembled and driven, and furthermore, its outer shape is polygonal columnar and the mating engagement means On the other hand, since the contact is made at the plane portion, it has the effect of dispersing the torque applied to the contact portion.

〔Example〕

Embodiments of the engaging pin of the mechanical seal according to the present invention will be described below with reference to FIGS. 1 to 3.

First, FIG. 1 is an exploded perspective view showing a first embodiment, in which a knock pin body 11 has a quadrangular prism-like outer shape, and a fitting hole 12 having approximately the same diameter as the knock pin body 11 is bored in the longitudinal direction. It is formed by externally fitting an exterior material 13 made of hard rubber. The knock pin 14 configured as described above is
As shown in FIG. 2, an engagement notch is formed on the outer periphery of the fixed sliding ring 15 of the fixed side member 16 of the device for the purpose of preventing the fixed sliding ring 15, which is a component of the mechanical seal, from rotating. 17, in a direction parallel to the rotating shaft (not shown), but as mentioned above, since the exterior material 13 is made of hard rubber and serves as a cushioning material, when the mechanical seal is installed and driven, etc. Even if the knock pin 14 and the engagement notch 17 collide, the impact is alleviated and no damage such as "chipping" occurs to the inner wall 17' of the engagement notch. Further, since the exterior material 13 has a quadrangular prism shape, by making the pair of flat outer walls 13', 13' parallel to the engagement notch inner wall 17', both 13', 17' come into planar contact with each other, so that the torque at the contact points is distributed and wear thereof is also prevented.

Next, FIG. 3 is an exploded perspective view showing a second embodiment of the present invention, in which a drive pin 21 for transmitting rotational torque to a member to be rotated, such as a rotating sliding ring (not shown), is shown. The shaft portion 18' of the bolt-shaped drive pin body 18 is covered with a hard rubber exterior material 20 having a square columnar outer shape and a fitting hole 19 having approximately the same diameter as the shaft portion 18'. It is constructed by fitting and has the same effect as the first embodiment described above.

In each of the above embodiments, the external shape of the exterior material is square prism, but this is of course not limited to this, and any polygonal prism that makes planar contact with the mating engagement means may be used. good.

[Effect of idea]

As described above, the present invention has an engaging pin for a mechanical seal in which the pin body is covered with an exterior material made of a cushioning material and has a polygonal columnar outer shape. Mitigates sudden impacts, etc., and prevents damage such as chipping of the mating member,
Furthermore, the wear of the contact parts is prevented, and the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a first embodiment of the engaging pin of a mechanical seal according to the present invention, FIG. 2 is an explanatory view showing the assembled state of this embodiment, and FIG. FIG. 4 is an explanatory diagram showing the assembled state of the engagement pin of a conventional mechanical seal, and FIGS. 5 and 6 are partially cutaway views showing other conventional examples. FIG. 11... Knock pin body, 12, 19... Fitting hole, 13, 20... Exterior material, 13'... Outer wall,
14... Knock pin, 15... Fixed sliding ring, 16
... fixed side member, 17 ... engagement notch, 18 ... drive pin body, 21 ... drive pin.

Claims (1)

[Scope of utility model registration request] In a mechanical seal that is interposed between a non-rotating housing and a rotating shaft that is loosely inserted into the inner periphery of the shaft hole of the housing and prevents leakage of the contained fluid, there is a For the purpose of mutually engaging a constituent member and another member, an engaging pin is implanted in one member and engages with an engaging means formed in the other member, and includes a pin body and the pin body. An engagement pin for a mechanical seal, characterized in that the engagement pin is made of a cushioning material and has a polygonal columnar outer shape and is fitted onto the exterior of the mechanical seal.