Sealing member and pipe joint

Patent metadata

Field	Value
Publication number	US-12031645-B2
Application number	US-202117792748-A
Country	US
Kind code	B2
Filing date	Jan 14, 2021
Priority date	Mar 18, 2020
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

An inner ring 4 of a pipe joint 1 includes a cylindrical body portion 5 having a communication hole 5 a for providing communication between flow passage holes 2 c and 8 a of a joint body 2 and a tube 8 , and an annular primary sealing portion 11 projecting from a radially inner side of an axially outer end portion of the body portion 5 toward an axially outer side and to be press-fitted into an annular primary sealing groove 2 d formed on the joint body 2 . The primary sealing portion 11 is formed so as to be tapered from an axially inner end thereof toward an axially outer end thereof in an axial cross-sectional view, and has a flat surface 11 c extending from a radially outer end 11 b of the axially outer end thereof toward the radially inner side.

First claim

The invention claimed is:

1. A sealing member for sealing and connecting flow passage holes formed in two fluid devices, respectively, the sealing member comprising:
a cylindrical body portion having a communication hole for providing communication between the flow passage holes;
an annular primary sealing portion projecting from a radially inner side of an axially outer end portion of the body portion toward an axially outer side and to be press-fitted into an annular primary sealing groove formed at a connection end portion of the flow passage hole of one of the fluid devices; and
an annular secondary sealing portion projecting from a radially outer side of the axially outer end portion of the body portion toward the axially outer side and to be press-fitted into an annular secondary sealing groove formed on the radially outer side with respect to the primary sealing groove in said one of the fluid devices, wherein
the primary sealing portion is formed so as to be tapered from an axially inner end thereof toward an axially outer end thereof in an axial cross-sectional view, and has a flat surface extending from a radially outer end of the axially outer end thereof toward the radially inner side, and
an inner circumferential surface of the primary sealing portion is inclined with respect to an inner circumferential surface of the body portion such that a diameter thereof gradually increases from an axially inner end thereof toward an axially outer end thereof.

2. A sealing member for sealing and connecting flow passage holes formed in two fluid devices, respectively, the sealing member comprising:
a cylindrical body portion having a communication hole for providing communication between the flow passage holes;
an annular primary sealing portion projecting from a radially inner side of an axially outer end portion of the body portion toward an axially outer side and to be press-fitted into an annular primary sealing groove formed at a connection end portion of the flow passage hole of one of the fluid devices; and
an annular secondary sealing portion projecting from a radially outer side of the axially outer end portion of the body portion toward the axially outer side and to be press-fitted into an annular secondary sealing groove formed on the radially outer side with respect to the primary sealing groove in said one of the fluid devices, wherein
the primary sealing portion is formed so as to be tapered from an axially inner end thereof toward an axially outer end thereof in an axial cross-sectional view, and has a flat surface extending from a radially outer end of the axially outer end thereof toward the radially inner side, and
the primary sealing portion has a chamfered portion formed at a corner portion formed by an inner circumferential surface and the flat surface of the primary sealing portion.

3. A sealing member for sealing and connecting flow passage holes formed in two fluid devices, respectively, the sealing member comprising:
a cylindrical body portion having a communication hole for providing communication between the flow passage holes;
an annular primary sealing portion projecting from a radially inner side of an axially outer end portion of the body portion toward an axially outer side and to be press-fitted into an annular primary sealing groove formed at a connection end portion of the flow passage hole of one of the fluid devices; and
an annular secondary sealing portion projecting from a radially outer side of the axially outer end portion of the body portion toward the axially outer side and to be press-fitted into an annular secondary sealing groove formed on the radially outer side with respect to the primary sealing groove in said one of the fluid devices, wherein
the primary sealing portion is formed so as to be tapered from an axially inner end thereof toward an axially outer end thereof in an axial cross-sectional view, and has a flat surface extending from a radially outer end of the axially outer end thereof toward the radially inner side, and
a thickness dimension in Mal a radial direction at the axially outer end of the primary sealing portion is not less than 10% and not greater than 30% of a thickness dimension in the radial direction at the axially inner end of the primary sealing portion.

4. A pipe joint comprising:
a joint body having an external thread portion formed on an outer circumference thereof, and having a flow passage hole formed inside the joint body;
a union nut having an internal thread portion formed on an inner circumference thereof and tightened to the external thread portion; and
an inner ring connected at an axially outer end portion thereof to the joint body and having a bulge portion which is formed on an outer circumference of an axial inner end portion thereof so as to project and is to be press-fitted into an end portion of a tube, wherein
the inner ring includes
a cylindrical body portion having a communication hole for providing communication between flow passage holes formed in the joint body and the tube, respectively,
an annular primary sealing portion projecting from a radially inner side of an axially outer end portion of the body portion toward an axially outer side and to be press-fitted into an annular primary sealing groove formed at a connection end portion of the flow passage hole of the joint body, and
an annular secondary sealing portion projecting from a radially outer side of the axially outer end portion of the body portion toward the axially outer side and to be press-fitted into an annular secondary sealing groove formed on the radially outer side with respect to the primary sealing groove in the joint body,

the primary sealing portion is formed so as to be tapered from an axially inner end thereof toward an axially outer end thereof in an axial cross-sectional view, and has a flat surface extending from a radially outer end of the axially outer end thereof toward the radially inner side, and
an inner circumferential surface of the primary sealing portion is inclined with respect to an inner circumferential surface of the body portion such that a diameter thereof gradually increases from an axially inner end thereof toward an axially outer end thereof.

5. A pipe joint comprising:
a joint body having an external thread portion formed on an outer circumference thereof, and having a flow passage hole formed inside the joint body;
a union nut having an internal thread portion formed on an inner circumference thereof and tightened to the external thread portion; and
an inner ring connected at an axially outer end portion thereof to the joint body and having a bulge portion which is formed on an outer circumference of an axial inner end portion thereof so as to project and is to be press-fitted into an end portion of a tube, wherein
the inner ring includes
a cylindrical body portion having a communication hole for providing communication between flow passage holes formed in the joint body and the tube, respectively,
an annular primary sealing portion projecting from a radially inner side of an axially outer end portion of the body portion toward an axially outer side and to be press-fitted into an annular primary sealing groove formed at a connection end portion of the flow passage hole of the joint body, and
an annular secondary sealing portion projecting from a radially outer side of the axially outer end portion of the body portion toward the axially outer side and to be press-fitted into an annular secondary sealing groove formed on the radially outer side with respect to the primary sealing groove in the joint body,

the primary sealing portion is formed so as to be tapered from an axially inner end thereof toward an axially outer end thereof in an axial cross-sectional view, and has a flat surface extending

Assignees

• Nippon Pillar Packing

Inventors

• Kurosaki Ayumi
• Higuchi Shingo
• Teshima Kazukiyo
• Ohmae Kiyotaka
• Katanaya Masashi

Classifications

• F16J15/10

  with non-metallic packing · CPC title

• F16L33/22

  with means not mentioned in the preceding groups for gripping the hose between inner and outer parts · CPC title

• F16L19/05 Primary

  with a rigid pressure ring between the screwed member and the exterior of the flared pipe end · CPC title

• F16J15/106

  homogeneous · CPC title

• F16L33/223

  the sealing surfaces being pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts · CPC title