JPS6322382Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to an improvement of a mechanical seal that seals the rotating parts of equipment.

(Prior art and its problems) Generally, a mechanical seal as shown in FIG. 6 is widely known. That is, a spring c whose rear end is supported by a collar b fixed to a rotating shaft a is pressed through a compression ring d, and a seal ring e, which rotates according to the shaft, and a non-rotating housing f are pressed. The fixed floating sheet g seals the sealing fluid by close sliding of its opposing end surfaces e' and g'.
The seal ring e is fitted into the stepped inner periphery of the compression ring d, and the gap between the two d and e is O.
It is sealed by ring h.

The mechanical seal having the above configuration has the following features: (a) Since the seal ring e is fitted into the inner periphery of the stepped portion of the compression ring d by a method such as shrink fitting, shrink fitting stress is generated.

(b) It is difficult to finish the stepped inner surface d' of the compression ring d, which presses the rear surface of the seal ring e, with ultra-precision by wrapping.

(c) The pressure of the sealing fluid applied to seal ring e is:
As shown by the arrow in FIG. 6, since it is biased toward the sliding end surface e' side with the O-ring h as the boundary, the end surface e' side acts to contract in the inner diameter direction.

For the reasons listed above, the seal ring e was likely to suffer from surface distortion that could cause a fluid leakage accident.

In addition, as shown in FIG.
There is a method of joining using a retainer i that has an annular body having a diameter i' and a projection j extending from the main body in a direction parallel to the axis, but in this case, the joining is achieved by caulking the projection j'. Since the joining and disassembly requires special tools,
Workability was poor.

The present invention was developed in view of the above-mentioned problems and with the aim of solving them, and provides a mechanical seal in which the compression ring and the sliding ring are extremely easily joined, and the surface distortion of the sliding ring is minimized. It is something to do.

[Structure of the invention] (Means for solving the problems and their effects) The mechanical seal of the present invention, which is a means for achieving the above object, is arranged in front of a sliding ring and an elastically biased spring. , a compression ring that presses the sliding ring, an annular part having a fitting stepped part formed on the periphery, and a required number of rings extending from the annular part in a direction parallel to the axis and having an engaging pawl at the tip part. It is characterized in that it is joined by a clip retainer consisting of a protrusion, and the joint is sealed with a cushioning material such as an O-ring.

In the above configuration, the compression ring and the sliding ring are not joined by shrink fitting, and the compression ring does not have a step into which the sliding ring is fitted, so the rear surface of the sliding ring is It is possible to perform ultra-precision machining by wrapping on the surface that presses on the sliding ring, and the structure balances the pressure of the sealing fluid applied to the sliding ring. This suppresses surface distortion to a minimum. Furthermore, the clip retainer makes it extremely easy to connect and separate the compression ring and the sliding ring, and no special tools are required for this operation.

(Embodiment) Hereinafter, an embodiment of the mechanical seal according to the present invention will be described in detail with reference to FIGS. 1 to 5. First, FIG. 1 is a half-cut sectional view of this embodiment.
1 is a rotating shaft, 2 is a collar fixed to the shaft 1, 3 is a spring, 4 is a compression ring, and 5 is a seal ring;
3, 4, and 5 rotate together with the shaft 1.
On the other hand, 6 is a housing of a non-rotating member, 7 is a floating seat that is fitted and fixed to the housing, and the floating seat 7 and the seal ring 5 closely slide on their opposing end surfaces 7' and 5'. This seals the fluid in the rotating parts. Reference numeral 8 denotes a clip retainer that joins the compression ring 4 and the seal ring 5, and includes an annular portion 10 having a fitting stepped portion 9 formed on the inner periphery, and a tip portion extending from the annular portion in a direction parallel to the axis. It consists of a required number of protrusions 13 each having an engaging pawl 12 with an inclined surface 11 formed on its side. Interlocking stepped portion 14 formed on the surface
They are interrelated with each other. Further, 15 is an O-ring that seals between the compression ring 4 and the seal ring 5, and 16 is a knock pin that engages the rings 4 and 5 with each other in the circumferential direction.

In this embodiment, the structure is as described above, and since the seal ring 5 is not joined to the compression ring 4 by shrink fitting, there is no stress caused by the shrink fitting. Furthermore, the end surface 4' of the compression ring 4 on the side of the seal ring 5 can be finished with ultra-precision by wrapping, and furthermore, the pressure of the sealing fluid applied to the seal ring 5 is
As shown by the arrows in FIG. 2, they are almost balanced on the outer circumferential side bordered by the sliding end surface 5' with respect to the floating sheet 7 and the O-ring 15, which is a sealing member. Therefore, the surface distortion that causes leakage accidents of the sealed fluid can be suppressed to a minimum.

In addition, as shown in FIG. 3, in order to join the seal ring 5, O-ring 15, and compression ring 4, which are separated from each other, using the clip retainer 8, first the seal ring 5 is attached to the fitting step 9 of the clip retainer 8. into the annular groove 1 of the side wall 4'.
When the compression ring 4 with the O-ring 15 fitted to the seal ring 7 is pressed in the axial direction toward the seal ring 5, the outer peripheral end of the compression ring 4 touches the protrusion of the clip retainer 8, as shown in FIG. After coming into contact with the inclined surface 11 at the tip of the portion 13, it smoothly moves toward the seal ring 5 while pressing the inclined surface in the outer radial direction. At the moment when the engagement step 14 of the compression ring 4 reaches the same position as the engagement pawl 12 of the projection 13, the projection, which had been pushed open in the radial direction, elastically returns to its original position, as shown in FIG. In this manner, the engaging step portion 14 and the engaging pawl 12 are engaged, and at the same time, the compression ring side wall 4' comes into contact with the rear back surface of the seal ring 5, and the O
The ring 15 is in close contact between the rings 4 and 5. Note that reference numeral 13' is a thin portion formed to give the protrusion 13 flexibility.
Furthermore, the work of separating each member from the joined state as shown in FIG. No special tools are required.

[Effects of the invention] As described above, in the mechanical seal of the invention, the sliding ring and the compression ring are joined by the clip retainer, and the joining and separation work is extremely easy, and the shrink-fitting stress is reduced. The contact surface between the sliding ring and the compression ring can be finished with high precision, and the pressure applied to the sliding ring is balanced. Since it prevents distortion, the practical effects of the present invention are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a half-cut sectional view showing an embodiment of the mechanical seal of the present invention, Fig. 2 is a sectional view of main parts showing the pressure distribution situation in the same embodiment, and Figs.
6 is a half-cut sectional view showing an example of a conventional mechanical seal, and FIG. 7 is a sectional view of a main part showing another example of a conventional mechanical seal. DESCRIPTION OF SYMBOLS 1... Shaft, 4... Compression ring, 5... Seal ring, 7... Floating seat, 8... Clip retainer, 9... Fitting step part, 10... Annular part, 12... Engagement Nails, 13...
Projection, 15...O-ring.

Claims (1)

[Scope of utility model registration request] In a mechanical seal related to shaft sealing technology, a sliding ring and a compression ring that is arranged in front of an elastically biased spring and presses the sliding ring are formed with a fitting step on the periphery. The annular part is joined by a clip retainer consisting of a required number of protrusions extending from the annular part in a direction parallel to the axis and having engaging claws at the tips, and the joined part is sealed with a cushioning material such as an O-ring. A mechanical seal that is characterized by the ability to