A cross-flow fan includes a disc-shaped or circular annular support plate, plural blades extending in a lengthwise direction from the support plate, and an auxiliary ring. The auxiliary ring has a ring portion that is positioned on a lengthwise direction intermediate section of the plural blades and is disposed on an outside of outer ends of the plural blades, and plural connection portions that extend from the ring portion as far as spaces between adjacent blades of the plural blades and are joined to the blades in the spaces between adjacent blades.

Cross-flow fan

Embodiments of the present invention relate to a system and method for noise suppression. Specifically, embodiments of the present invention include a resonator configured to suppress noise from an electric fan. The resonator may comprise an enclosure having an outer perimeter, a major opening through the enclosure and defining an inner perimeter of the enclosure, a minor opening disposed along the inner perimeter, and a chamber coupled to the minor opening within the enclosure between the inner and outer perimeters.

System and method for noise suppression

The present invention includes an air supply path 5 that is housed in a casing 2 and supplies outdoor air into a room, an exhaust path 6 that is housed in the casing and exhausts indoor air out of the room, an outdoor temperature sensor 18 that senses a temperature of outdoor air, an indoor temperature sensor 19 that senses a temperature of indoor air, a control device that controls volumes of air blow from a supply blower and an exhaust blower based on signals outputted from the outdoor temperature sensor and the indoor temperature sensor, a bypass passage 15 that is juxtaposed to an air supply passage or an exhaust passage to bypass a heat exchanger, and a damper 16 that switches between the air supply passage or the exhaust passage and a bypass passage. The control device executes control to perform a normal ventilation operation by switching the damper to the bypass passage and increase air volumes of the supply blower and the exhaust blower over air volumes in a heat-exchange ventilation operation that is performed before switching to the normal ventilation operation when a heat-exchange ventilation operation is performed, and determining that the temperature of the outdoor air is equal to or higher than a first threshold and a difference between the outdoor air temperature and the indoor air temperature is equal to or larger than a second threshold.

Heat-exchange ventilation device

A multi-blade fan including a spirally-shaped casing having an inlet and an outlet; an electric motor disposed inside the casing; a main plate provided perpendicular to a rotation axis of the electric motor and having a ventilation hole; first blades disposed at a side of the inlet of the main plate; and second blades disposed at an opposite side of the inlet of the main plate. Herein, a diameter of the main plate is smaller than an outer diameter of the first and second blades and is larger than an inner diameter of them. Furthermore, an outlet angle of any one or both of the first blade and the second blade is sequentially changed in an axis direction.

Multi-blade fan

A compressor impeller and a method of manufacturing the compressor impeller. The magnesium alloy compressor impeller as a die-cast part comprises a hub shaft part, a hub disk part having a hub surface extending from the hub shaft part in the radial direction, and a plurality of vane parts disposed on the hub surface. The impeller can be manufactured by a die-cast method in which a magnesium alloy heated to a liquidus temperature or higher is supplied into molds with cavities corresponding to the shape of the impeller for a filling time of 1 sec. or shorter, a pressure of 20 MPa or higher is applied to the magnesium alloy in the cavities, and the pressurized state is maintained for a time of 1 sec. or longer.

Compressor impeller and method of manufacturing the same

A blowing apparatus includes a suction passage having a suction chamber enclosed by rigid body surfaces, suction ports opening toward the suction chamber for sucking air from outside, and a fan suction port serving as a suction port for a blower, the suction ports, the suction chamber, and the fan suction port being arranged in nonlinear form. In such blowing apparatus, a doughnut-like straightening guide is arranged on an opening edge on the suction chamber side of the fan suction port. The straightening guide has a projection toward the suction chamber, an appropriate thickness in the radial direction, and a guide passage matching the fan suction port in the middle thereof. A:

Blowing Apparatus, Suction Panel Therefor and Straightening Guide Therefor

A fan according to the present invention can be monolithically molded out of a metal with a low energy in combination with a structure of a metal mold, in which gate arrangement and/or distribution of dimensions of vanes is devised in injecting a low melting-point metal such as magnesium, wherein not only production but also reproducing such as recycling are facilitated, and also a metalwave of the fan can be produced in consideration of the global atmosphere preservation.

Fan, method for producing the fan by molding molten metal, and device for producing the fan by molding molten metal

PROBLEM TO BE SOLVED: To blast air to a distance by leading air from a diffuser air flow passage near the outer periphery of a fan casing to a clearance between an air passage member on a thin sheet and the other side wall provided on a surface opposed to the side wall and blasting the air from a blasting port so as to assure the direction and velocity of the blasting air. SOLUTION: A clearance allowing air to flow axially from a centrifugal diffuser air passage 9 between a semi-circular fan casing and a first air passage member 3 to a centrifugal diffuser air passage rear space 10 is formed as follows. Namely, the clearance between the casing and the first air passage member 3 is constant on the upper half side, and a clearance between the main body side wall and the first air passage member 3 is increased toward the lower half side. Thus, the blast air from a propeller fan is concentrated downward, concentrated in a specified direction without diffusing the flow of air after being left from the fan, and blasted with the air volume and air velocity maintained. Thus, a large air volume can be blasted to a distance.

Blower, blasting system, and blasting method for the blasting system

PROBLEM TO BE SOLVED: To remove water adhering to an umbrella in a short time and further to facilitate disposal of removed water drops. SOLUTION: In the case where an umbrella 2 is inserted through an umbrella insert opening 3 into a dewatering processing space part 25 provided on the upper side in a box body 1 and stored in the closed state, when a blower 7 provided on the lower side in the box body is operated, the blower sends air taken in from the outside to an air feed pipe 23, which is an air flow jetting means provided in the box body, to be jetted as a high speed air flow extending over the full length of the umbrella stored in the dewatering processing space part from the two or more holes 24 provided in the air feed pipe, whereby the high speed air flow is applied to the cloth along a shaft 26 of the umbrella so that the water adhering to the umbrella can be removed in a short time, and further the water blown off from the umbrella flows down in an exhaust space part 21 provided on the lower side in the box body 1 from the dewatering processing space part so that the removed water drops can be easily disposed. COPYRIGHT: (C)2005,JPO&NCIPI

Umbrella dewatering device

PROBLEM TO BE SOLVED: To simply change a shaft length and a shaft diameter by forming a shaft part formed integrally by melting metal with a blade part, as either one part of a die gate part formed as a metal passage to the blade part at formation of, or a housing part for housing a solidified metal. SOLUTION: A blade part is rotated by the rotation of a motor which is directly connected to a rotary shaft hole 7. In a shaft part for supporting and rotating the blade part, removing a die gate part 2 which is injection molded, a boss part 8 is completed. When an outer diameter dimension of the boss part 8 of the shaft part is formed with the same dimension as that of the gate part 2 at die design, a tip of a housing part 4 for housing solidified metal by which a nozzle outlet of an injection molder is blocked, or an injection side of the gate part 2 is cut out by means of machining work, and the rotary shaft hole 7 is formed by only machining. The conical gate part 2 is as a center of a hub part 6, and thereby molten metal can be filled uniformly from the center of a shaft into the circumference where multiple blades are formed.

Yoshimi Iwamura

Papers

Blowing Apparatus, Suction Panel Therefor and Straightening Guide Therefor

Fan, method for producing the fan by molding molten metal, and device for producing the fan by molding molten metal

Blower, blasting system, and blasting method for the blasting system

Umbrella dewatering device

Propeller fan, molten metal forming method for the propeller fan, and molten metal forming device for the propeller fan