JPS6217652Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mounting structure for a fixed ring in a mechanical seal.

Conventionally, for the fixed ring of a mechanical seal, as shown in FIG. An O-ring f and a knock pin b which fit into the hole d and prevent the rotation of the floating seat a, and which are integrated with the floating seat a by encircling a C-shaped retainer ring e in a circumferential groove formed in the housing c. The structure of this part was complicated, and its functionality was poor.

In view of the above points, the present invention has been developed in a fixed ring of a mechanical seal in which the anti-sliding surface of a floating sheet is fitted in contact with a housing. A C-shaped retainer ring is inserted and fixed in the inner circumferential groove, and the notch of the C-shaped retainer ring is engaged with a protrusion provided on the front surface of the fixed ring, thereby preventing deviation in the direction of rotation between the two. The present invention provides a mounting structure for a fixed ring in a mechanical seal that prevents the locking.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIGS. 2 to 4 show a mechanical seal showing the first embodiment. The mechanical seal is an O-ring 4 that fits into a circumferential groove provided on the outer periphery of a floating seat 3 that is loosely fitted onto a rotating shaft 2 that is pivotally installed in a shaft hole of a housing 1.
A fixed ring consisting of the O-ring 4 and the floating seat 3 is formed in the stepped portion 5 of the shaft hole of the housing 1 adjacent to the front surface (rotating ring side) of the floating seat 3. The C-shaped retainer ring 7 elastically fits into the inner circumferential groove 6 and prevents it from being pulled out. The dowel pin 9 is erected so that it is in the correct position. A seal ring 11 loosely fitted and externally inserted into the rotating shaft 2 is brought into contact with the sliding surface 10 of the fixed ring so as to be able to freely slide and rotate, and the seal ring 11 and the case 12 are brought into contact with each other.
The packing 14, which is integrated with the drive ring 13, maintains airtightness between the rotating shaft 2 and the set screw 1.
Collar 16 and case 1 fixed by screwing 5
The seal ring 11 is constantly pressed against the sliding surface 10 of the floating seat 3 by a coil spring 17 interposed between the two.

Therefore, as described above, the fixed ring consisting of the floating seat 3, O-ring 4, and knock pin 9 is constructed so that the knock pin 9 installed upright on the floating seat 3 is located between the notch 8 of the C-shaped retainer ring 7. , when the C-shaped retainer ring 7 comes into contact with the end of one of the C-shaped retainer rings 7 due to its rotation, the C-shaped retainer ring 7 is fitted into the inner circumferential groove 6 by its own elastic expansion force, so that the housing 1 prevents the fixed ring from rotating due to sliding movement with the seal ring 11.

Next, FIGS. 5 to 7 show a second embodiment of the present invention, and only the parts that are different from the first embodiment will be explained.
A rubber packing 18a having a press-fitted portion integrally formed on the outer periphery and having a substantially rectangular cross section is fixed to the outer ring of the rubber packing 18a, and an annular case 19a is integrally baked and vulcanized on the front surface of the packing 18a. Therefore, in this embodiment, the engagement protrusion 20a, which is a protrusion formed integrally on the front surface of the annular case 19a, and the notch 8a of the C-shaped retainer ring 7a engage with each other.
This exhibits a rotation-preventing effect similarly to the embodiment.

Further, FIGS. 8 to 10 show a third embodiment, in which a fixed ring is constructed from a floating sheet 3b, a packing 18b, and an annular case 19b, and the annular case is similar to the second embodiment. A concave portion 21b is formed in the ring member 22b, and a pair of engagement protrusions 23b and 24b that protrude in opposite directions are formed at opposing positions on the ring member 22b.
The engagement protrusion 24b on the other (front) of the ring member 22b is arranged so that the engagement protrusion 23b on the one (rear) side engages with the notch recess 21b of the annular case 19b, and the engagement protrusion 24b on the other (front) is connected to the notch of the C-shaped retainer ring 7b. 8b.

Furthermore, FIGS. 11 to 13 show a fourth embodiment, in which the fixed ring is composed of a floating seat 3c and an O-ring 4c, as in the first embodiment, and the front surface of the floating seat 3c is A concave portion 21c is formed in the C-shaped retainer ring 7c and engages with a locking protrusion 25c bent in both directions (rearward direction) at one end of the C-shaped retainer ring 7c.

As described above, in the present invention, it is only necessary to provide a protrusion on the front surface of the fixed ring in order to prevent the fixed ring from shifting in the rotational direction, and there is no need to form any other engaging portion. Therefore, a mounting structure with a simple structure can be provided. Moreover, with the mounting structure of the present invention, the C-shaped retainer ring can be inserted and fixed into the inner circumferential groove so that the notch engages with the protrusion. Such careful assembly work is not required. Therefore, it is possible to provide a mounting structure that is easy to assemble.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Fig. 1 is a half-cut sectional view of the main part showing a conventional fixed ring mounting structure;
FIG. 2 is a front sectional view of a mechanical seal showing the first embodiment, FIG. 3 is a view taken along the line A in FIG.
Fig. 4 is an exploded perspective view of the same essential parts, Fig. 5 is a front sectional view of the mechanical seal showing the second embodiment, Fig. 6 is a view taken along line B in Fig. 5, and Fig. 7 is the essential parts. 8 is a front sectional view of a mechanical seal showing the third embodiment, FIG. 9 is a view taken along the line C in FIG. 8, FIG. 10 is an exploded perspective view of the same essential parts, and FIG. 11 12 is a front sectional view of a mechanical seal showing a fourth embodiment, FIG. 12 is a view taken along line D in FIG. 11, and FIG. 13 is an exploded perspective view of the same essential parts. 1...Housing, 2...Rotation shaft, 3, 3a,
3b, 3c...Floating sheet, 4, 4c
... O-ring, 5 ... Shaft hole step, 6 ... Inner circumferential groove,
7, 7a, 7b, 7c...C type retainer ring,
8, 8a, 8b... Notch, 9... Knock pin,
10...Sliding surface, 11...Seal ring, 12...
...Case, 13...Drive ring, 14, 18
a, 18b... Packing, 15... Set screw, 16... Collar, 17... Coil spring, 19a, 19b... Annular case, 20a,
23b, 24b...Engaging protrusion, 21b, 21c...
... recess, 22b... ring member, 25c... locking protrusion.

Claims (1)

[Scope of utility model registration request] In a fixed ring of a mechanical seal formed by fitting the anti-sliding surface of a floating sheet into a housing, a C-shaped retainer ring is located in the inner circumferential groove formed in the stepped portion of the shaft hole of the housing, located on the front surface of the fixed ring. a fixing ring that is inserted and fixed in place, and also engages a notch of the C-shaped retainer ring with a protrusion provided on the front surface of the fixing ring to prevent the fixing ring from shifting in the rotational direction. mounting structure.