Title:
FLUID PRESSURE ARITHMETIC UNIT
Document Type and Number:
Japanese Patent JPS608512
Kind Code:
A
Abstract:
PURPOSE:To accomplish high-accuracy fluid pressure control in an open loop by disposing a pair of pressure plates, the spring force of which can be changed by a step motor in a fluid pressure arithmetic unit adapted to obtain fluid pressure according to an electric signal applied from the outside. CONSTITUTION:When air pressure is supplied from a supply port 11 through an air path 12 to a nozzle 13 to cause pressure to work upon a pressure plate 6, the back pressure is acted upon a pressure plate 7 through an air path 16, an output port 17, an input port 18 and a diaphragm 19. At this time, the spring force of a spring 21 is applied to the pressure plate 6. The spring force is changed in proportion to the travel of a feed screw axially displaced according to the rotation of a rotor 27 caused by a step motor 24. Thus, the output pressure P0 obtained from the output port 17 is proportioned to the number of pulses applied to the step motor 24. Accordingly, a drift in temperature is not caused, which can eliminate the need of temperature compensation to simplify the structure.
Inventors:
IIZUKA HIROMICHI
Application Number:
JP11646983A
Publication Date:
January 17, 1985
Filing Date:
June 28, 1983
Export Citation:
Assignee:
ASAHI ENTERPRISE KK
International Classes:
F15C3/04; (IPC1-7): F15C3/04
Attorney, Agent or Firm:
Osamu Matsumura
Next Patent: JPS608513