Hitachi, Ltd.

Hitachi Plant Technologies, Ltd.

T-tec Co., Ltd.

Hiroaki Yoda

Katsuya Ebara

Yasuo Koseki

Takashi Nakao

Sankichi Takahashi

Harumi Matsuzaki

Tomihisa Ohuchi

Akira Nishiguchi

Daisuke Hisajima

Hideaki Kurokawa

Nobuatsu Hayashi

Michihiko Aizawa

Yukio Hishinuma

Akira Yamada

Takashi Mizumori

Koichi Tsuzuki

Junichi Kobayashi

Toshio Masuda

Kazuo Kobayashi

Minoru Morita

Naohiro Momma

Susumu Horiuchi

Minoru Hiroshima

Yoshifumi Kunugi

Isao Okouchi

Seiichiro Sakaguchi

Kinpei Okano

Tomohiro Naruse

Ryuichi Kaji

Takeo Takagi

Masaaki Nakano

Kenzi Machizawa

Takahisa Nitta

Minoru Kuroiwa

Shiro Nakadaira

Koji Yamamoto

Isao Kouchi

Satoshi Yumoto

Takuya Ando

Hideki Akiniwa

Shunzoo Tomioka

Kousaku Shimizu

Yoshitsugu Itoh

Terukazu Nioka

According to the present invention, along the right and left sides of a rotary shaft, flat faces that serve as sealing faces are formed at the circumferential edges, on the suction chamber side, of semicircular division plates, which define suction chambers and a discharge chamber of a volute casing that is divided into two segments. Two disc plates are prepared as pressure test tools, and are positioned on the right and left sides of the rotary shaft so that they contact the flat faces that are formed around the circumferential edges of the division plates near the suction chambers. The two disc plates are then securely connected to a member in the axial direction. In addition, a bolt fastening structure, which is axially tightened by the member that connects the disc plates axially, is provided in at least one axial direction.

Pressure test method of double suction volute pump

A magnetic separation unit can prevent any magnetic flocs deposited on an inner wall of a water passing pipe from closing a water channel for stabilizing a magnetic separation performance and reduce cost by a small-diameter portion of the water passing pipe. The magnetic separation unit has an air-core solenoid type magnet provided around the water passing pipe guiding, from a lower side, treated water including magnetic flocs in which contaminants and magnetic particles are flocculated, a rotating disc type magnetic filter case provided above the air-core solenoid type magnet for attracting the magnetic flocs in the treated water supplied from the water passing pipe and flushing means for flushing the matrixes to which the magnetic flocs are attracted. The water passing pipe has a small-diameter pipe positioned in the air-core solenoid type magnet, and an enlarged pipe enlarged from the small-diameter pipe toward a water passing part of the rotating disc type magnetic filter case.

Magnetic separation unit and water purification system

Purification apparatus

A purification system is provided for purifying the water of eutrophic lakes and marshes by partitioning the target lake/marsh to form a specified water treating area therein. For this purpose, a partitioning structure is provided for enclosing and partitioning the whole or part of an area around the mouth of each river flowing into the target eutrophic lake/marsh in the direction of depth to form a water treating water area; and a purifier for taking in water from the water treating area operates to separate and remove pollutants from the water, and then discharges treated water outside the water treating area.

Purifying method and purification system for lakes and marshes

To provide an absorption air conditioning system and cooling/heating change-over method which do not make users uncomfortable just after a cooling mode is changed to a heating mode and vice versa, there is provided an absorption air conditioning system including an absorption cool water/hot water making machine for producing cool water/hot water for air conditioning, a room machine for carrying out the air conditioning of a room by circulation of the cool water/hot water from the absorption cool water/hot water making machine, and a piping for introducing the cool water/hot water from the absorption cool water/hot water making machine to the room machine, wherein the system further includes a bypass piping connected between the absorption cool water/hot water making machine and the room machine through a valve, and a means for opening/closing the valve.

Absorption air conditioning system and cooling/heating changing-over

An absorption heat pump and a cogeneration system are provided to have high efficiency of utilizing exhaust heat. An absorption heat pump having an evaporator, an absorber, a high-temperature regenerator, a low-temperature regenerator and a condenser is combined with a fuel cell such that the pump includes a cycle in which vapor exhaust heat from the fuel cell is used as a heat source for the evaporator and the high-temperature regenerator, and another cycle in which warm-water exhaust heat from the fuel cell is used as a heat source for the low-temperature regenerator.

Absorption heat pump and cogeneration system utilizing exhaust heat

An unit-type air conditioning system is provided to enable low-load operation of an absorption chiller heater, to thereby improve the load responsiveness, and to use such a chiller heater as an outdoor unit. A plurality of burners are provided in a high temperature generator of the absorption chiller heater, thereby enabling the low-load operation. A refrigerant return valve is provided so as to speed up the stop operation. Flow rates of pumps are controlled in accordance with detected values of temperatures in the chiller heater and a load change, thus improving the load responsiveness. Further, in the air conditioning system with this chiller heater serving as an outdoor unit, required operation prediction is performed on the basis of outer signals from load units and the like, and prediction control according to its result is conducted, further improving the load responsiveness.

Absorption chiller heater and unit-type air conditioning system

An individual air conditioning system with an absorption chiller heater having a controllable capacity, with thermal input to a burner of a high temperature regenerator being controlled by on-off control or the like even if the load is low. The temperature of cooling water is controlled in accordance with a concentration of refrigerant in an absorber, so that the refrigerating capacity of the absorption chiller heater can be freely varied from 0% to 100% without the refrigerant being frozen.

Control method and apparatus of absorption chiller heater

A distillation system has a degassing tank, a distiller for generating vapor of raw water taken from the degassing tank, a heater for heating the vapor from the distiller to convert the vapor into a high temperature and pressure vapor, a hydrophobic porous membrane through which the vapor from the heater flows, and a heat transfer unit provided in the distiller for effecting heat exchange between the vapor from the membrane member and the raw water from the degassing tank. The structural elements such as the heat exchange unit, piping, etc., with which the vapor from the membrane or the condensate thereof is brought into contact are made of titanium or titanium alloy.

Distillation system with a hydrophobic porous membrane

An absorption air conditioner having a regenerating chamber for heating and condensing a portion of a dilute solution generated in an absorber and an absorption chamber for causing refrigerant vapor generated in the regenerating chamber to be absorbed into said dilute solution which is at an intermediate position in the passage connected from the absorber to the regenerator so that the size of the absorber is reduced and the overall size of the absorption air conditioner is reduced.

Absorption air conditioner

Vapor is separated from mist accompanying the vapor by passing the vapor through a porous membrane. The vapor having passed through the membrane is brought into contact with an object to be washed and condenses thereon, whereby the object is washed.

Vapor washing process and apparatus

A distilling apparatus includes an evaporation section which heats raw water and causes the generation of vapor from said raw water, and a hydrophobic porous film through which the thus generated vapor is filtered. Because vapor separated from the raw water is supplied to one surface of the hydrophobic porous film, the proportion of the vapor relative to the fluid supplied to that surface of the film can be increased, thereby enabling the efficient filtering of a large amount of vapor through the film. In addition, because the temperature of condensed water obtained by cooling the vapor can be kept in the vicinity of the boiling point thereof, any gases and volatile substances contained in the raw water are prevented from dissolving in the distilled water, thereby enabling the production of extremely pure distilled water.

Distilling apparatus

The present invention relates to a process for producing ultra-pure water, an apparatus for producing said ultra-pure water and a process for using the ultra-pure water produced according to said process. More particularly, the present invention relates to a process for producing ultra-pure water which comprises boiling a raw water to vaporize off the volatile components from the raw water, subsequently generating steam from the water, contacting the steam with a hydrophobic, porous, gas-permeable and liquid-impermeable membrane to make the steam permeate the membrane, and then condensing the steam, as well as to an apparatus for producing said ultra-pure water and a process for using said ultra-pure water.

Process for producing ultra-pure water and process for using said

An apparatus for producing pure water from raw water, comprises a reverse osmotic membrane unit, a polisher, an ultraviolet sterilizer, a high pressure pump for forcing raw water to flow through a reverse osmotic membrane in said reverse osmotic membrane unit to produce pure water permeated therethrough, and for feeding pure water to a use point, and a circulating line extending between said use point and a suction side of said high pressure pump for circulating pure water therebetween. With this construction, degradation of pure water due to stagnation is avoided.

Apparatus for purifying and dispensing water with stagnation preventing

A vertical motor pump including an upper bearing and a lower bearing located on the motor side for journaling a rotary shaft for rotation at an upper portion and a lower portion respectively of a rotor, at least one of the upper and lower bearings being constituted by a ball bearing. The vertical motor pump further includes a hydrostatic lubricated bearing system for journaling the rotary shaft besides the ball bearing, for bearing a radial thrust during operation.

Vertical motor pump

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Tsuchiura, Japan

Hiroaki Yoda