US 7,456,753 B2
Internal pressure explosion-proof system
Teruhisa Kitagawa, Kitakyushu (Japan); and Shingi Takahashi, Kitakyushu (Japan)
Assigned to Kabushiki Kaisha Yaskawa Denki, Kitakyushu-shi (Japan)
Filed on Apr. 19, 2006, as Appl. No. 11/406,514.
Claims priority of application No. 2005-121821 (JP), filed on Apr. 20, 2005; and application No. 2006-101374 (JP), filed on Apr. 03, 2006.
Prior Publication US 2006/0250025 A1, Nov. 09, 2006
Int. Cl. G08B 21/00 (2006.01)
U.S. Cl. 340—614  [340/501; 340/532; 340/611; 340/632; 340/680; 340/623; 901/1; 901/23; 901/40; 901/43; 901/49] 6 Claims
OG exemplary drawing
 
1. An internal pressure explosion-proof system, comprising:
an internal pressure explosion-proof mechanism to be installed in a hazardous atmospher, the internal pressure explosion-proof mechnainsm having an internal pressure chamber to which inactive-gas/air is supplied;
a control apparatus to be installed in a non-hazardous atmosphere to control the internal pressure explosion-proof mechanism;
an inactive-gas/air supplying portion configured to supply inactive-gas/air to the internal pressure explosion-proof mechanism;
an inactive-gas/air discharging portion configured to release the inactive-gas/air discharged from the internal pressure explosion-proof mechanism;
a high-pressure abnormality detector configured to send a signal to the control apparatus when an internal pressure of the internal pressure explosion-proof mechanism becomes higher than a predetermined pressure; and
an alarm configured to give warning when the signal of the high-pressure abnormality of the high-pressure abnormality detector is received, wherein the control apparatus makes the alarm generate warning and also makes the inactive-gas/air discharging portion release inactive-gas/air in the internal pressure explosion-proof mechanism when the control apparatus receives the signal of the high-pressure abnormality from the high-pressure abnormality detector, and wherein the internal pressure explosion-proof mechanism is a robot.