Transmission device

Patent metadata

Field	Value
Publication number	US-9612173-B2
Application number	US-201414532456-A
Country	US
Kind code	B2
Filing date	Nov 4, 2014
Priority date	Nov 15, 2013
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

In a pressure and pressure difference transmitter that seals a sealing liquid for transmitting the pressure inside a pressure leading passage, the pressure and pressure difference transmitter forming a space between a diaphragm and a main body side wall surface, including the pressure leading passage connected to the main body side wall surface, and transmitting the pressure received by the diaphragm to a sensor through the sealing liquid sealed in the space and the pressure leading passage, a hydrogen occluding material for occluding hydrogen atoms of the sealing liquid is disposed at least in the sealing liquid, the main body side wall surface, or a part of a portion from the main body side wall surface to the sensor, with the hydrogen occluding material being formed with an uneven shape on the surface or being attached with a granular hydrogen occluding material.

First claim

The invention claimed is:

1. A transmission device for pressure or pressure difference comprising:
a pressure receiving chamber, a first diaphragm that constitutes a part of the pressure receiving chamber and a pressure leading passage that is connected to the pressure receiving chamber and transmitting pressure received by the first diaphragm to a sensor through a sealing liquid sealed in a space of the pressure receiving chamber and the pressure leading passage,
wherein a hydrogen occluding material that occludes hydrogen atoms of the sealing liquid is disposed in the sealing liquid and the hydrogen occluding material is a metallic wire-shaped hydrogen occluding material, and
wherein a granular hydrogen occluding material is attached to the wire-shaped hydrogen occluding material.

2. The transmission device according to claim 1 , wherein
wherein the hydrogen occluding material is sealed, or attached, or sealed and attached in the inside of the pressure leading passage.

3. The transmission device according to claim 1 ,
wherein hydrogen intruded from the outside of the transmission device is occluded or hydrogen atoms generated in the inside are occluded by the hydrogen occluding material.

4. The transmission device according to claim 1 ,
wherein the hydrogen occluding material is palladium, magnesium, vanadium, titanium, manganese, zirconium, nickel, niobium, cobalt, calcium, or an alloy thereof.

5. The transmission device according to claim 1 ,
wherein the hydrogen occluding material is pellet like, plate-like or spherical.

6. The transmission device according to claim 1 , further comprising:
a second diaphragm which is arranged between the first diaphragm and the sensor in the pressure leading passage that receives the pressure from the first diaphragm,
wherein the first diaphragm is arranged to receive the pressure of a measured liquid and transmit the pressure through the pressure leading passage to the second diaphragm,
wherein the sealing liquid is configured to transmit the pressure received by the first diaphragm and to transmit the pressure received by the second diaphragm; and
wherein the hydrogen occluding material is arranged in any of the inside of the pressure leading passage, the sealing liquid side of the first diaphragm, and the second diaphragm, or a combination thereof.

7. The transmission device according to claim 6 , further comprising:
a third diaphragm and a fourth diaphragm arranged in the pressure leading passage between the first diaphragm and the second diaphragm,
wherein the hydrogen occluding material is arranged at a position of any of the pressure receiving side of the third diaphragm, the sealing liquid side of the third diaphragm, the pressure receiving side of the fourth diaphragm or the sealing liquid side of the fourth diaphragm, or a combination thereof.

Assignees

• Hitachi Ltd

Inventors

• Kuwana Ryo
• Fushimi Atsushi
• Shinma Daisuke
• Hanami Hideki
• Hara Isao

Classifications

• G01L13/026 Primary

  involving double diaphragm · CPC title

• G01L19/06

  Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa · CPC title

• G01L7/08 Primary

  of the flexible-diaphragm type · CPC title