Title:
PRESSURE DETECTION DEVICE OF OIL SUPPLY MACHINE
Document Type and Number:
Japanese Patent JP2021081247
Kind Code:
A
Abstract:
To provide a pressure detection device for detecting pressure in a suction pipe of an oil supply machine which suppresses degradation of a diaphragm and extends a life of the pressure detection device.SOLUTION: A pressure detection device includes: a communication pipe 11 which communicates with a suction pipe 7 and has a hole part 17 and a covering part 18 on a lower surface; a diaphragm 12; a magnet 13; a reed switch 14; a resin plate 15; and a casing 16. The diaphragm 12 blocking an opening of the casing 16 is arranged so as to adjacent to lower parts of the hole part 17 and the covering part 18, the diaphragm 12 is sucked to the hole part 17 and becomes flat when a pressure in the suction pipe 7 is normal (negative pressure), the diaphragm 12 is separated from the hole part 17 and the covering part 18 when the pressure in the suction pipe 7 is abnormal (atmospheric pressure), the magnet 13 is lowered by gravity, the reed switch 14 is turned on, and abnormal pressure in the suction pipe 7 is reported.SELECTED DRAWING: Figure 2
Inventors:
MAESHIBA SHINSUKE
Application Number:
JP2019207259A
Publication Date:
May 27, 2021
Filing Date:
November 15, 2019
Export Citation:
Assignee:
SHOWA KIKI KOGYO KK
International Classes:
G01L7/08; B67D7/32; G01L9/00; G01L9/14
Attorney, Agent or Firm:
Eiwa patent office