Fukuji Tsukada

Bio: Fukuji Tsukada is an academic researcher. The author has contributed to research in topics: Drive shaft & Air conditioning. The author has an hindex of 3, co-authored 5 publications receiving 41 citations.

Outdoor machine for air conditioner

Abstract: PROBLEM TO BE SOLVED: To make compact and silent an outdoor machine for an air conditioner which uses the air blowing-out surface of an axial fan installed to the upper section of an enclosure as its upper surface by providing a corner guide to at least one of the void sections in the corner sections formed of the front-face plate, roof plate, and one side-face plate which is adjacent to the front-face plate SOLUTION: A top-flow type outdoor machine 1 is provided with air supplying openings on its side-face sides and a heat exchanger 8 on its back side The machine 1 is also provided with a compressor 9, an accumulator 10, an axial fan, a bell mouth 12, etc, and a heat-exchanged wind exhausted front the fan 11 is discharged upward after passing through an exhaust pipe 7 and a guard net 16 In the machine 1, a corner guide 18a is provided to the void of each corner section formed of the front-face plate 2, side-face plate, roof plate 6, and bell mouth of the machine 1 Therefore, the outdoor machine 1 can be operated silently, because the heat-exchanged wind sucked from the heat exchanger 8 is prevented front staying in the voids of the corner sections and, at the same time, the efficiency deterioration of the fan 11 caused by uneven flows in the circumferential direction can be suppressed

Air-conditioning fan

Abstract: PROBLEM TO BE SOLVED: To control any possible vibration in making the boundary-layer control of flow separation achievable by installing a lot of small holes in plural sheets of blade surface members constituting a fan in a sense of being perpendicular and oblique with a blade surface, and providing a different king member in a hollow layer in the inner part of a blade SOLUTION: Many small holes 5 are installed in a suction surface 6 and a pressure surface 7 in place nearer to a rear edge 3 of a fan 1 The inner part of a spatial layer held between both these blade surfaces 6 and 7 is composed of an integrally formed different kind member A flow 8 taken into the fan 1 from a front edge 2 of a blade flow into the small holes 5, producing small vortexes there These vortexes produced in the small holes 5 are discharged to the outside air form the small holes 5 after having receiving a pressure interference on the surface of the different kind member 4 in the spatial layer The vortexes discharged to the outside air become lessened of a pressure variation in the blade surface in order to become such a vortex as preventing it from being separated form these surfaces 6 and 7 Therefore it turns to a vibration absorbent by installing the different kind member 4 in the spatial layer being held between these surfaces 6 and 7 Thus, a reduction in fluid noises is made possible, and thus the vibro-noise being generated out of the fan is reducible

Centrifugal oil separator and outdoor unit of air conditioning device

Abstract: PROBLEM TO BE SOLVED: To provide a centrifugal oil separator reducing its size and weight without degrading oil separating performanceSOLUTION: This centrifugal oil separator 100 includes a container body 1 having a cylindrical part 1a, an inlet pipe 2 connected in the tangential direction of an inner wall surface of the cylindrical part at an upper part of the cylindrical part of the container body, an outlet pipe 3 connected to the upper part of the container body by being inserted coaxially with the container body, and a discharge pipe 4 connected to a lower part of the container body This centrifugal oil separator is configured to satisfy 040≤d/D≤044, when a diameter of the inlet pipe is d, and a diameter of the cylindrical part of the container body is D

Air conditioner and outdoor unit of air conditioner

Abstract: PROBLEM TO BE SOLVED: To suppress the lowering of the capacity of an air conditioner due to frosting. SOLUTION: This air conditioner comprises an outdoor heat exchanger 5 allowing refrigerant to flow therein, an air blow fan 7 formed of an air blow vane 19 and a motor 21, a control device 23 controlling the rotational speed of the motor 21 to a set rotational speed No, and a current detector 29 detecting the current value I of the motor 21. When the current value I detected by the current detector 29 is increased, the set rotational speed No is increased according to the degree of an increase in the current value I to increase air volume passing through the outdoor heat exchanger 5 so as to promote heat exchange for increasing a heat exchanged amount. As a result, the exchanged heat amount lowered by the covering of a heat transfer surface with frost can be compensated to suppress the lowering of the capacity of the air conditioner 5. COPYRIGHT: (C)2004,JPO&NCIPI

Fan for air conditioner

Abstract: PURPOSE:To prevent the propagation of vibration from a motor to a fan in a simple manner by holding an impeller attached to a driving shaft projecting out of the motor with two rubber preventers consisting of two plates holding rubber between, and forming a clearance in an interval between the impeller and the driving shaft. CONSTITUTION:In this air conditioner fan, an impeller is attached to a driving shaft 2a projecting out of a motor. In this case, this impeller is held by two rubber preventers consisting of two plates holding rubber between, and a clearance is formed in an interval between the impeller and the driving shaft. In brief, a driving shaft diameter A is set to be smaller than a driving shaft inserting hole diameter B and thereby the driving shaft 2a and the fan are always maintained in a noncontact way, whereby vibration in the motor is prevented from being propagated to the fan, forestalling any noise due to resonance. On the other hand, torque out of the driving shaft 2a is transmitted via plural rubber vibration insulators. Each rubber vibration insulator is made up of unitizing each of flat washers 3a, 3g, pinned washers 3c, 3e and rubber pieces 3b, 3f as one boy and these elements are attached to the motor side and the shaft end side respectively.

Indoor unit of air-conditioning apparatus and air-conditioning apparatus

Abstract: An indoor unit (100) includes a casing (1) having a suction port (2) formed on an upper portion and a blow-out port (3) on a lower side of a front surface portion, an axial-flow or mixed-flow fan (20) provided on the downstream side of the suction port (2) in the casing (1), and a heat exchanger (50) provided in the casing (1) at a position on the downstream side of the fan (20) and on the upstream side of the blow-out port (3). The heat exchanger (50) includes a plurality of fins (56) arranged side by side with predetermined gaps therebetween and a plurality of heat-transfer tubes (57) penetrating through the plurality of fins (56). The heat exchanger is configured in such a manner that the air-flow resistance of an area facing the outer peripheral side of the fan (20) is larger than the air-flow resistance of an area facing a center portion of the fan (20).

Impeller for blower

Abstract: PROBLEM TO BE SOLVED: To retain excellent aerodynamic performance by changing the inlet angle of a blade according to a load. SOLUTION: In this impeller for a blower formed by arranging a plurality of blades 2, 2,... at predetermined intervals in a circumferential direction on the peripheral surface of a hub 3, the blade 2 has a split structure comprising a first blade member 21 forming the front edge part 2a of the blade 2 and a negative pressure surface in the vicinity of the front edge part 2a and a second blade member 22 forming a part except for the first blade member 21. By this structure, an interval in a blade rotating direction is enlarged and changed between the first blade member 21 and the second blade member 22, thereby the length of the blade 2 comprising the first blade member 21 and second blade member 22 is lengthened on the front edge part 2a, and the inlet angle of the blade 2 is increased and changed in the case that, for example, the inlet angle is regulated by an angle to a rotary axial center, and the inlet angle of the blade 2 can be changed according to the change of the inflow angle of an airflow.

Air conditioning device

Abstract: An air-conditioning device (100) provided with the following: an outdoor unit (1) containing a compressor (10), a first refrigerant-path switching device (11), and a heat-source-side heat exchanger (12); a heat-medium exchanger (3) containing an inter-heat-medium heat exchanger (15), a flow-restriction device (16), a second refrigerant-path switching device (18), and a pump (21); and at least one indoor unit (2) containing a usage-side heat exchanger (26). The compressor (10), the first refrigerant-path switching device (11), the flow-restriction device (16), the second refrigerant-path switching device (18), and the inter-heat-medium heat exchanger (15) are connected by refrigerant piping, forming a refrigeration-cycle circuit. The inter-heat-medium heat exchanger (15) and the usage-side heat exchanger (26) are connected by heat-medium piping, forming a heat-medium circulation circuit through which a heat medium other than the refrigerant circulates. By switching the first refrigerant-path switching device (11), this air-conditioning device enters a defrost mode wherein the refrigerant discharged from the compressor (10) is supplied to the heat-source-side heat exchanger (12). In said defrost mode, some of the refrigerant flowing from the heat-source-side heat exchanger (12) is supplied to the inter-heat-medium heat exchanger (15) without going through the flow-restriction device (16), and the rest is returned to the outdoor unit (1) without going through either the flow-restriction device (16) or the inter-heat-medium heat exchanger (15).

Outdoor unit of refrigerator, and electrical equipment box of outdoor unit

Abstract: The present invention reduces the size of an outdoor refrigerator unit of the type that draws in air from a lateral face, exchanges heat with the air, and blows the air out of a top face while ensuring that the electrical equipment box has sufficient volume and suppressing the increase in the air flow resistance. The air conditioning system outdoor unit is of the type that draws in air from air inlets provided in the rear panel and a pair of side panels of a casing, exchanges heat with the air, and blows the air out through an air outlet provided in a top panel. The outdoor unit is provided with an axial fan and an electrical equipment box arranged inside the casing. The electrical equipment box is arranged inside the casing and has a first box part that is provided below the axial fan and a second box part that is provided below the first box part and has a larger surface area in a plan view than the first box part.

Outdoor unit for air conditioner

Abstract: An outdoor unit for an air conditioner, comprising: a heat exchanger disposed inside a housing; and a bottom plate of the housing, including, a bottom plate portion, a flange formed by upwardly folding back an edge of the bottom plate portion, a drainage hole penetrating the bottom plate portion and configured to discharge water, a plurality of mounting bases protruding upwardly from the bottom plate portion and supporting a lower end of the heat exchanger by upper surfaces thereof, and a drainage conduit provided in contact with the mounting bases and inclining downward toward the drainage hole, wherein a portion of the bottom plate portion positioned between at least one of the plurality of the mounting bases and the flange includes an inclined portion which is inclined toward the drainage conduit in a longitudinal direction of the flange.