Sanyo Electric Co., Ltd.

Kazuo Ikegami

Naohide Tanigawa

Tatuya Hirose

Kenichi Sato

Masahiro Iseki

Mitsuhiro Masuda

Fusao Terada

Hiroyuki Suzuki

Tatsuya Hirose

Rikio Tadano

Kiyoshi Fukushima

Takashi Morita

Seiji Ikeda

Takashi Nakazato

A waste water treatment device is provided in which removal of phosphorus and removal of nitrogen can efficiently be carried out and a decrease in size of the device and a decrease in cost can be achieved. The waste water treatment device includes a waste water treatment chamber; at least one set of electrodes disposed so that at least a part of the electrodes are immersed in waste water in the waste water treatment chamber, at least one of said electrodes dissolving out, by electrolysis, iron ions or aluminum ions for precipitating and removing phosphoric acid ions in waste water; a power source for supplying an electrolytic current to the set of electrodes; a control section for controlling the power source; and a metallic catalyst which is disposed in the vicinity of at least one of the sets of electrodes and which effects a denitrifying reaction with hydrogen in waste water.

Waste water treatment device

In a gas compressor-expander according to the invention, a partition wall between a space in the rear of a piston and a crank chamber has a piston rod slidably extending therethrough and a seal device surrounding the piston rod . The seal device comprises a first seal member having a high sealing property against a flow from the crank chamber toward the space , an intermediate chamber provided in the vicinity of the first seal member at one side thereof toward the space, a second seal member disposed in the vicinity of the intermediate chamber at one side thereof toward the space, and a communication channel for holding the intermediate chamber and the crank chamber in communication with each other. This construction gives a prolonged life to the seal device and prevents impairment of the refrigeration capacity of the gas compressor-expander.

Sealing device for gas compressor-expander

The gas compression/expansion apparatus comprises: a working section for compressing/expanding therein a working gas by pistons each connected with a rod; a drive section including sliders each connected at one end thereof with the rod and connected at one end thereof with a guide for guiding the slider, and a drive mechanism for reciprocating the sliders; and a separator for fluid dynamically separating the working section from the drive section, the separator permitting said rod to pass through said separator. The separator further includes an oil seal arrangement. Formed inside the separator is an intermediate chamber which allows the rod to pass there through. The inner radius of the intermediate chamber is greater than the radius of the rod plus the oil deposited on the rod. The guide includes a guide space formed such that the distance between the slider at its upper dead point and the wall of the separator facing the slider is larger than the thickness of the oil on the slider. The separator also includes an oil return passage for allowing the oil accumulated in the guide space to return to an oil sump. The oil seal arrangement may prevent the oil on the guide from coming into direct contact with the separator and prevent the oil on the rod from entering the working section.

Gas compression/expansion apparatus

An improved heat exchanger for use in a gas compression/expansion apparatus. The heat exchanger comprises: a tube connected with a compression/expansion space of a compression/expansion cylinder of the apparatus; a central cylinder coaxially disposed in the tube such that a narrow gap for the working gas is formed only between the central cylinder and the tube. The heat exchanger may liberate heat from, or providing heat to, the compression/expansion cylinder through heat transfer between the working gas in the tube and an ambient medium surrounding said tube. The heat exchanger is capable to serve as a low/high temperature heat source for an external heat load.

Heat exchanger for a gas compression/expansion apparatus and a method of

An apparatus for compressing/expanding a working gas (compression/expansion apparatus), including: a cylinder; a piston for compressing/expanding said working gas in a working space (front space) of said cylinder; a crank mechanism connected with a piston rod of said piston via an oil seal; a crank chamber for housing therein said crank mechanism and communicating with said cylinder via said oil seal, said apparatus comprising: a first tube allowing for a unidirectional flow of the working gas from said crank chamber to said front space in said cylinder, said first tube having therein an oil filter and a first check valve; and a second tube allowing for a unidirectional flow of the working gas from said front space to a second space (rear space) behind said piston in said cylinder, said second tube having therein a second check valve. In this construction a loop of the working gas is established for pumping the gas from the crank chamber to the rear space of the cylinder via the front space, and then back to the crank chamber via the oil seal between the cylinder and the crank chamber. The passage of the gas through the oil seal helps prevent the lubrication oil from infiltrating directly from the crank chamber into the cylinder along the piston rod.

Growing community of inventors

Osaka, Japan

Kazuo Ikegami