Ebara Corporation

Fuji Electric Holdings Co., Ltd.

Masahito Kawai

Hiroshi Uchida

Hiromi Sakacho

Masashi Obuchi

Miho Isono

Yukio Murai

Kaoru Nakajima

Kenta Tokairin

Kenichi Kajiwara

Nobuhiro Higaki

Masahiko Kishi

Masahiro Minami

Hiroaki Ichikawa

A display system is provided that includes: a rotary machine device including a rotary machine and a drive machine causing the rotary machine to rotate; a display device capable of displaying a state of the rotary machine device; a detection section acquiring plural state quantities indicating the state of the rotary machine device; and a display control section displaying a chart on the display device on the basis of the plural state quantities acquired by the detection section, the chart being configured as a multidimensional chart in which the plural state quantities of the rotary machine device at specific time are plotted and the plural state quantities are set as values, each of which corresponds to each axis.

Display system with a rotary machine and drive machine

The present invention relates to a volute pump for delivering a liquid containing fibrous substances. The volute pump includes an impeller () having a vane (), and an impeller casing () which houses the impeller () therein. The impeller casing () includes a volute chamber (), a suction port () and a discharge port () which communicate with the volute chamber (), and a tongue portion () which forms a starting portion of the volute chamber (). A groove (), extending from the suction port () to the volute chamber (), is formed in an inner surface of the impeller casing (). An intersection point (B), where a terminal end of the vane () passes across the groove () as viewed from an axial direction of the impeller (), is located at an opposite side from the tongue portion () with respect to a central point of the impeller ().

Volute pump

A volute pump for delivering a liquid containing fibrous substances. The volute pump includes an impeller () rotatable together with a rotational shaft (), and an impeller casing () having a suction port () and a volute chamber (). A groove (), extending from the suction port () to the volute chamber (), is formed in an inner surface of the impeller casing (). The impeller () includes a hub () to which the rotational shaft () is fixed, and a sweep-back vane () extending helically from the hub (). The sweep-back vane () includes a leading edge portion () extending helically from the hub (), and a trailing edge portion () extending helically from the leading edge portion (). The leading edge portion () has a front-side curved surface () extending from an inner end () to an outer end () of the leading edge portion ().

The present invention relates to a volute pump and particularly provides a volute pump for delivering a liquid containing fibrous substances and solid substances, while preventing these substances from obstructing the pump. The volute pump includes a pump casing () having a protrusion () projecting into a flow passage () and separating a starting end of a volute from a terminal end of a volute. The protrusion () faces a liquid outlet () of an impeller (). A radius of curvature (Rb) of a cross section of a distal edge of the protrusion () at its one side end () is larger than a radius of curvature (Ra) of the cross section of the distal edge of the protrusion () at other side end (). The other side end () faces a main plate (), while the one side end () is located opposite to the main plate ().

A casing liner used for a sewage pump includes a surface to face an edge of a blade of an impeller when the casing liner is assembled with the impeller into the sewage pump. At least one groove with given width is formed in at least a part of the surface. The groove includes a first section with given depth, which is located on the side close to a rotational center of the impeller, a second section smaller in depth than the first section, which is located on the side far from the rotational center of the impeller, and a third section that is an inclined face connecting the first and second sections, the first to third sections being arranged in a width direction of the groove.

Casing liner for sewage pump and sewage pump with the same

A photovoltaic inverter control method includes steps of monitoring a variation in output voltage of a solar battery by a power and voltage monitoring circuit () and, when the variation occurs, accelerating or decelerating an electric motor () to maximize the output voltage of the solar battery (), whereby the electric motor for driving, for example, a pump and a fan by the solar battery as a power source can be driven by a photovoltaic inverter always at the maximum power point of the solar battery.

Method and device for controlling photovoltaic inverter, and feed water device

According to the present invention, in a water supply apparatus which converts output power of a solar cell with an inverter to drive a motor pump for pumping up water, a DC brushless motor having no sensor for detecting a position of a rotatable shaft is used as a motor for driving the pump. Further, the water supply apparatus, having a pump and a frequency converter for supplying electric power to the pump and controlling a rotational speed of the pump, includes a standard current value table in which rotational frequencies of the pump and standard current values as criteria for shutoff operation at the rotational frequencies are associated with each other, a rotational frequency detecting device for detecting a rotational frequency of the pump, a standard current value acquiring device for acquiring a standard current value corresponding to the rotational frequency detected by the rotational frequency detecting device with reference to the standard current value table, a current detecting device for detecting a current value supplied to the pump, and a comparing device for comparing the current value detected by the current detecting device with the standard current value acquired by the standard current value acquiring device.

Growing community of inventors

Tokyo, Japan

Masahito Kawai