A vane front edge (4a) of a turbofan (1) is comprised of a projected vane front edge (4a3) provided between a main plate-side vane front edge (4a1) and a shroud-side vane front edge (4a2), which extends away from a vane rear edge (4b) as the distance from a main plate (2) increases (positioned in a rotational direction (A)) and which is curved so as to be positioned apart from a rotational center (O); and a main plate-side front edge foot portion (41a1) which is inclined so as to extend away from the vane rear edge (4b) and the rotational center (O) as the distance from the main plate (2) decreases, in the area of the main plate-side vane front edge (4a1), which is close to the main plate (2). On the other hand, a main plate-side vane rear edge (4b1) corresponding to the area of the vane rear edge (4b), which is close to the main plate (2), is substantially perpendicular to the main plate (2), and a shroud-side vane rear edge (4b2) corresponding to the area of the vane rear edge (4b), which is close to a shroud (3), is inclined so as to be gradually separated from the main plate front edge (4a) (delayed in the rotational direction (A)) as the distance from the main plate (2) increases.

Turbofan and air conditioner

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).

Air conditioning device

An air conditioning system that includes desiccant compartments for holding a desiccant; a heat exchanger, a blower and a vessel. The heat exchanger can be filled with a heat transfer medium, while the blower blows ambient air by the heat exchanger such that the blown air is cooled and the heat exchanger is warmed such that thermal energy increases and is transferred from the air to the heat transfer medium causing the heat transfer medium to turn into vapor. The vapor is then diffused to one of the desiccant compartments such that the vapor is adsorbed onto the desiccant creating a mixture. Then an energy source is applied to the mixture such that the vapor and desiccant are separated. The separated vapor is transported to the vessel where it is condensed and then sent back to the heat exchanger, such that the system is able to be continuously operating.

Air-conditioning system

PROBLEM TO BE SOLVED: To provide an air-conditioning machine capable of appropriately cleaning an indoor heat exchanger.SOLUTION: An air-conditioning machine 100 comprises: a refrigeration circuit Q where a coolant is circulated through a compressor 31, a condenser, an outdoor expansion valve 34 and an evaporator in series; and a control section which controls at least the compressor 31 and the outdoor expansion valve 34. One of the condenser and the evaporator is an outdoor heat exchanger 32 and the other is an indoor heat exchanger 12 having a temperature sensor to detect a temperature of the indoor heat exchanger 12. The control device causes the indoor heat exchanger 12 to function as the evaporator and stops a freezing process to freeze the indoor heat exchanger 12 after the lapse of a predetermined first period since the freezing process is started.SELECTED DRAWING: Figure 3

Air-conditioning machine

An air conditioning apparatus is capable of being mounted on the ceiling of an air-conditioned room. The air conditioning apparatus includes a casing in which an intake port is formed in a bottom surface, a filter provided in the intake port, a cleaning mechanism for removing dust collected by the filter from the filter, and a dust box provided at the bottom of the casing to collect dust removed by the cleaning mechanism. A nozzle insertion hole through which a nozzle of a vacuum cleaner can be inserted is formed facing downward in the dust box.

Air-Conditioning apparatus

PROBLEM TO BE SOLVED: To miniaturize a body casing and to improve heat transferring performance. SOLUTION: In this indoor unit for the air conditioner provide with a centrifugal blower 2 for sucking the indoor air, a pair of heat exchangers 4, 4 disposed while holding the centrifugal blower 2 at its supply side, and supercooling heat exchangers 7, 7 respectively disposed at a windward side of the heat exchangers 4, 4, in the body casing 1, each supercooling heat exchanger 7 is composed of heat transfer tubes 7d arranged roughly in the vertical direction and a number of plate-shaped fins 7e orthogonal to the heat transfer tubes 7d, thus a spacial problem can be solved and the heat transferring performance can be significantly improved. COPYRIGHT: (C)2009,JPO&INPIT

Indoor unit of air conditioner

PROBLEM TO BE SOLVED: To effectively and uniformly reduce pressure loss and release noise at the entire region of the air blow grill of an outdoor machine for air conditioners. SOLUTION: Grill blades 2a, 2a, etc., or the like for composing the air blow grill 2 in the lattice shape of an outdoor machine casing 1 are formed into a sectional wing-type structure, and a flat part 5 in a saw-tooth shape is composed from the front ends 3a, 3a, etc., or the like to the front. With this configuration, tumbling vorticies are generated from a part ahead of the front end 3a, according to an air flow attach angle θα at bottoms 5b, 5b, etc., or the like of the flat part 5 in a saw-tooth shape for attracting an air flow with high flow rate, at a part away from the negative pressure surface of the grill blades 2a, 2a, etc., or the like effectively from the regions of the front ends 3a, 3a, etc., or the like of the grill blades 2a, 2a, etc., closer to the negative pressure surface, and the flow of the entire negative pressure surface side of each of the grill blades 2a, 2a, etc., or the like cannot be released more uniformly and the pressure loss and noise decrease effectively.

Outdoor machine for air conditioner

PROBLEM TO BE SOLVED: To provide a turbofan capable of inhibiting a separated flow near a leading edge of a blade and inhibiting a pressure loss of airflow and noises, and to provide an indoor unit of an air conditioner using it. SOLUTION: The blade 23 disposed between a hub plate and a shroud is formed in a manner that an inlet angle at the leading edge is gradually decreased from a hub plate side to a shroud side. The leading edge 24a, 24b of the blade 23 can be formed to bring inflow angles γh, γs of the airflow close to the inlet angles at the positions and the airflow enters a flow path between the blades in almost no collision with the blades 23. A separated flow is thus inhibited near the leading edge of the blade 23. COPYRIGHT: (C)2007,JPO&INPIT

Turbofan and indoor unit of air conditioner using it

PROBLEM TO BE SOLVED: To reduce air noise by smoothing air suction flow from a blade outer peripheral edge, in an impeller for propeller fan. SOLUTION: In this impeller, the pressure surface of a blade 3 is curved so that thickness of the blade 3 may be gradually reduced from a maximum thickness part toward a hub outer peripheral surface 4a after the thickness once increases from a blade outer peripheral edge 3e toward an impeller center Q in each curve or a straight line L 1 which can be obtained by connecting points in which the ratio of a length of a blade camber at each radius location of the blade 3 and a distance from a blade front edge 3c on the blade camber is made the same for each ratio. By constituting the impeller in this way, centrifugal flow based on centrifugal force according to revolution of the impeller 2 is suppressed and a deflection action to the blade outer peripheral edge 3e for air sucked in the vicinity of the blade front edge 3c and the front edge side end part 3h of the blade outer peripheral edge 3e is reduced as much as possible. Thus, leakage flow to a negative pressure surface 3a side in the outer peripheral part of the pressure surface is reduced and work in a portion in the vicinity of a hub 4 on the side of a blade rear edge 3d is promoted. Therefore, aerodynamic performance of a fan is improved and aerodynamic noise is reduced. COPYRIGHT: (C)1998,JPO

Impeller for propeller fan

PROBLEM TO BE SOLVED: To reduce noise generated from the collision of blade tip vortex and a fan guard in a discharge side of a propeller fan (ie, operation noise) by controlling the creation and growth of blade tip vortex at a part of blade outer circumference part not surrounded by a ball mouth SOLUTION: When a height in an axial direction of a part of the bell mouth 5 overlapping with an outer circumference part P of a blade 13 is defined as H1 and a height in the axial direction of the outer circumference part of the blade 13 is defined as H0, H1/H0 is set in a range from 040 to 065 to control the growth of leak flow leaking form a positive pressure surface to a negative pressure surface of the blade 13 (ie, blade tip vortex) at a part of the outer circumference part P of the blade 13 not surrounded by the bell mouth 5 while maintaining suction flow from the outer circumference part P of the blade 13

Onishi Tadashi

Papers

Indoor unit of air conditioner

Outdoor machine for air conditioner

Turbofan and indoor unit of air conditioner using it

Impeller for propeller fan

Outdoor unit for blower and air conditioner