NITTO KOHKI CO.,LTD.

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Industrial Tools

Quick Connect Couplings

Compressors and Vacuum Pumps

Electric Screwdrivers

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Nitto Kohki USA

Nitto Kohki Co., Ltd

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Design Principles

The mechanism and structure of Nitto Kohki pumps

Linear Free Piston Design

The electro-magnet and return spring alternately drive the piston inside the cylinder, the mechanical resonance of which is synchronized with the input current cycle.
There are AC models that use AC waveform and a silicon diode, and DC models that use DC waveform and an inverter.

Diaphragm Design

The change of polarity on the coil created by the AC power supply
causes a shuttling motion with the magnets.

This shuttling motion allows the pump to alternately draw air in through the inlet
valve and then discharge air through the outlet valve.

DC Moter Driven Diaphragm Design

The reciprocationg motion created by the connecting rod and rotating crank drive the diaphragm back and forth, drawing air in through the inlet port and out through the outlet port.

DC Moter Driven Cup Seal Design

The reciprocationg motion created by the connecting rod and rotating crank drive the cup seal back and forth, drawing air in through the inlet port and out through the outlet port.

The cup seal creates a seal with the inner diameter of the cylinder as the piston pushes it back and forth.

Nitto Kohki incorporates the same know-how with the cup seal material as it does with pistons used in the linear compressors and vacuum pumps.

Liquid Diaphragm Pump with Pulse Absorption Design

  • Liquid is drawn in
  • A partial fluid delivery to the pulse absorption chamber occurs, not directly forced out of the outlet port
  • Cyclical liquid drawn into the pump is synchronized with the discharging liquid

Pulses are attenuated through the process of 2 and 3

Liquid Pump / Piezoelectric Design

  • Bimorph vibrator
  • The BIMOR's driving force, the bimorph, is comprised of 2 parallel piezoelectric wafers.

  • Unimor vibrator
  • The Unimor's driving force, the unimorph, is comprised of one piezoelectric wafer.

    *Elastic mold Ceramic is affixed. The Bimorph and Unimorph are both circular. They contract and extend when powered.