Mechanical seal

Patent metadata

Field	Value
Publication number	US-2021018100-A1
Application number	US-201916982026-A
Country	US
Kind code	A1
Filing date	Apr 2, 2019
Priority date	Apr 3, 2018
Publication date	Jan 21, 2021
Grant date	—

Abstract

A mechanical seal includes rotating seal ring which rotate with a rotary shaft, stationary seal rings, and an adaptor which holds the stationary seal rings 30 , the adaptor 5 being fixed to a seal cover by bolts. The mechanical seal further includes a plurality of holders brought into contact with the adapter and provided with through holes. A body part of each of the bolts passes through each of the through holes and is screwed into each of threaded holes formed in the seal cover. The plurality of holders 9 being arranged so as to surround the rotary shaft.

First claim

1 . A mechanical seal comprising:
a rotating seal ring which rotate together with a rotary shaft; a stationary seal ring, an adapter which holds the stationary seal ring, the adapter being fixed to a seal cover by bolts; and a plurality of holders brought into contact with the adapter and provided with through holes, a body part of each of the bolts passing through each of the through holes and being screwed into each of threaded holes formed in the seal cover, the plurality of holders being arranged so as to surround the rotary shaft.

2 . The mechanical seal according to claim 1 , wherein the holders have inner flange portions formed around the through holes, bottom portions of head parts of the bolts being brought into contact with the inner flange portions.

3 . The mechanical seal according to claim 1 , wherein contact portions of the holders with the adapter are outer flange portions formed in the holders so as to extend radially outward.

4 . The mechanical seal according to claim 1 , wherein the holders are provided with receiving recesses for receiving the head parts of the bolts.

5 . The mechanical seal according to claim 1 , wherein the seal cover is provided with receiving recesses for receiving the holders.

6 . The mechanical seal according to claim 5 , wherein each of the holders and each of the receiving recesses in the seal cover are formed in a circular shape as viewed in a screw insertion direction of the bolts and are fitted to each other.

7 . The mechanical seal according to claim 5 , wherein each of the holders and each of the receiving recesses in the seal cover are formed in a non-circular shape as viewed in a screw insertion direction of the bolts and are fitted to each other.

8 . The mechanical seal according to claim 3 , wherein
the adapter has portions interposed between radially inner side parts of the outer flange portions and the seal cover, gaps are formed between radially outer side parts of the outer flange portions and the seal cover.

9 . The mechanical seal according to claim 1 , wherein a squeeze packing is provided so as to be at least partially positioned between the holders and the seal cover in the screw insertion direction of the bolts.

10 . The mechanical seal according to claim 2 , wherein contact portions of the holders with the adapter are outer flange portions formed in the holders so as to extend radially outward.

11 . The mechanical seal according to claim 2 , wherein the holders are provided with receiving recesses for receiving the head parts of the bolts.

12 . The mechanical seal according to claim 2 , wherein the seal cover is provided with receiving recesses for receiving the holders.

13 . The mechanical seal according to claim 12 , wherein each of the holders and each of the receiving recesses in the seal cover are formed in a circular shape as viewed in a screw insertion direction of the bolts and are fitted to each other.

14 . The mechanical seal according to claim 12 , wherein each of the holders and each of the receiving recesses in the seal cover are formed in a non-circular shape as viewed in a screw insertion direction of the bolts and are fitted to each other.

15 . The mechanical seal according to claim 4 , wherein
the adapter has portions interposed between radially inner side parts of the outer flange portions and the seal cover, gaps are formed between radially outer side parts of the outer flange portions and the seal cover.

16 . The mechanical seal according to claim 3 , wherein the holders are provided with receiving recesses for receiving the head parts of the bolts.

17 . The mechanical seal according to claim 3 , wherein the seal cover is provided with receiving recesses for receiving the holders.

18 . The mechanical seal according to claim 17 , wherein each of the holders and each of the receiving recesses in the seal cover are formed in a circular shape as viewed in a screw insertion direction of the bolts and are fitted to each other.

19 . The mechanical seal according to claim 17 , wherein each of the holders and each of the receiving recesses in the seal cover are formed in a non-circular shape as viewed in a screw insertion direction of the bolts and are fitted to each other.

20 . The mechanical seal according to claim 4 , wherein
the adapter has portions interposed between radially inner side parts of the outer flange portions and the seal cover, gaps are formed between radially outer side parts of the outer flange portions and the seal cover.

Assignees

• Eagle Ind Co Ltd
• Eagleburgmann Japan Co Ltd

Inventors

• KITO Masakazu
• Takigahira Yoshiaki

Classifications

• F16J15/3484 Primary

  Tandem seals · CPC title

• F16J15/3464

  Mounting of the seal · CPC title

• F16B43/00

  Washers or equivalent devices; Other devices for supporting bolt-heads or nuts (circlips F16B21/18; {for indicating tensile load F16B31/02; forming a whole with the bolt or nut F16B33/00; locking bolts or nuts by means of a fixed plate or ring, or washer-like resilient plates F16B39/10, F16B39/24}) · CPC title

• F16B39/24

  by means of washers, spring washers, or resilient plates that lock against the object (locking to the screw-thread F16B39/14 {, F16B39/34}, F16B39/36) · CPC title

• F16B5/02

  by means of fastening members using screw-thread ({F16B5/0004 takes precedence}; construction of screw-threaded connections F16B25/00 - F16B39/00) · CPC title