Fusible plug

Patent metadata

Field	Value
Publication number	US-2022243872-A1
Application number	US-202217586900-A
Country	US
Kind code	A1
Filing date	Jan 28, 2022
Priority date	Jan 29, 2021
Publication date	Aug 4, 2022
Grant date	—

Abstract

A fusible plug for a high pressure gas cylinder includes a communication hole filled with a low melting point alloy, a porous metal sintered body is press-fitted in at least a part of the communication hole in a length direction, all or a part of the porous metal sintered body is impregnated with the low melting point alloy to solidify and composite the low melting point alloy. It is preferable that: the low melting point alloy has a melting point of 110° C.; the porous metal sintered body to be press-fitted is a porous metal sintered body having pores with an area ratio of 30% or more and 50% or less and having pores with a diameter exceeding 5 μm among the pores of 80% or more in terms of area ratio to all the pores; and the porous metal sintered body is a porous austenitic stainless steel sintered body.

First claim

1 . A fusible plug for a high pressure gas cylinder, comprising:
a communication hole; and a porous material attached to at least a part of the communication hole in a length direction, all or a part of the porous material being impregnated with a low melting point alloy to composite the low melting point alloy.

2 . The fusible plug for a high pressure gas cylinder according to claim 1 , wherein the low melting point alloy is an alloy having a melting point of 110±5.5° C.

3 . The fusible plug for a high pressure gas cylinder according to claim 1 , wherein the porous material is a porous metal sintered body having pores with an area ratio of 30% or more and 50% or less and having pores with a diameter exceeding 5 μm among the pores of 80% or more in terms of area ratio with respect to all the pores, the porous metal sintered body having transverse rupture strength of 50 MPa or more as measured by determination of transverse rupture strength conforming to provisions of Japan Powder Metallurgy Association Standard JPMA M09-1992.

4 . The fusible plug for a high pressure gas cylinder according to claim 3 , wherein the porous metal sintered body is a porous austenitic stainless steel sintered body.

5 . The fusible plug for a high pressure gas cylinder according to claim 1 , wherein a compressive yield strength of a region formed by impregnating the porous material with the low melting point alloy to composite the low melting point alloy is 1.5 times or more the compressive yield strength of the low melting point alloy.

6 . The fusible plug for a high pressure gas cylinder according to claim 1 , wherein the fusible plug has pressure resistance of 87.5 MPa or more at an environmental temperature of 85° C.

7 . The fusible plug for a high pressure gas cylinder according to claim 2 , wherein the porous material is a porous metal sintered body having pores with an area ratio of 30% or more and 50% or less and having pores with a diameter exceeding 5 μm among the pores of 80% or more in terms of area ratio with respect to all the pores, the porous metal sintered body having transverse rupture strength of 50 MPa or more as measured by determination of transverse rupture strength conforming to provisions of Japan Powder Metallurgy Association Standard JPMA M09-1992.

8 . The fusible plug for a high pressure gas cylinder according to claim 7 , wherein the porous metal sintered body is a porous austenitic stainless steel sintered body.

9 . The fusible plug for a high pressure gas cylinder according to claim 2 , wherein a compressive yield strength of a region formed by impregnating the porous material with the low melting point alloy to composite the low melting point alloy is 1.5 times or more the compressive yield strength of the low melting point alloy.

10 . The fusible plug for a high pressure gas cylinder according to claim 3 , wherein a compressive yield strength of a region formed by impregnating the porous material with the low melting point alloy to composite the low melting point alloy is 1.5 times or more the compressive yield strength of the low melting point alloy.

11 . The fusible plug for a high pressure gas cylinder according to claim 4 , wherein a compressive yield strength of a region formed by impregnating the porous material with the low melting point alloy to composite the low melting point alloy is 1.5 times or more the compressive yield strength of the low melting point alloy.

12 . The fusible plug for a high pressure gas cylinder according to claim 7 , wherein a compressive yield strength of a region formed by impregnating the porous material with the low melting point alloy to composite the low melting point alloy is 1.5 times or more the compressive yield strength of the low melting point alloy.

13 . The fusible plug for a high pressure gas cylinder according to claim 8 , wherein a compressive yield strength of a region formed by impregnating the porous material with the low melting point alloy to composite the low melting point alloy is 1.5 times or more the compressive yield strength of the low melting point alloy.

14 . The fusible plug for a high pressure gas cylinder according to claims 2 to 5 , wherein the fusible plug has pressure resistance of 87.5 MPa or more at an environmental temperature of 85° C.

15 . The fusible plug for a high pressure gas cylinder according claims 7 to 13 , wherein the fusible plug has pressure resistance of 87.5 MPa or more at an environmental temperature of 85° C.

Assignees

• Nippon Piston Ring Co Ltd
• Jtekt Corp

Inventors

• Takiguchi Hiroshi
• Aoki Atsuya
• Numazaki Kazushi
• Takahashi Takeshi
• Iwamoto Natsuki
• Watanabe Yudai

Classifications

• F16K17/383 Primary

  the valve comprising fusible, softening or meltable elements, e.g. used as link, blocking element, seal, closure plug (F16K17/386 takes precedence) · CPC title

• F16K17/40

  with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint (valves opening on surplus pressure F16K17/14) · CPC title

• F17C2205/0317

  fusing or melting · CPC title

• F17C13/06 Primary

  Closures, e.g. cap, breakable member ({for autoclaves B01J3/03}; closures for {large} containers in general B65D {B65D90/54}; {for pressure vessels in general F16J13/00}) · CPC title

• F17C2203/0643

  Stainless steels · CPC title