Turbo fan and air conditioning apparatus
First Claim
1. A turbo fan comprising:
- a disk-shaped main plate provided with a rotation center at the center and a projecting boss formed in the vicinity of the rotation center;
a cylindrical shroud arranged opposite to the main plate and provided with a diameter expanded portion whose inner diameter becomes more expanded, the closer it becomes to the main plate; and
a plurality of blades with one end and the other end joined to the main plate and the shroud respectively;
whereina blade rear edge of each blade is located on a virtual cylinder formed by an outer periphery of the main plate and an outer periphery of the shroud,a blade front edge of each blade is located closer to the rotation center than the blade rear edge of the blade, and a virtual line which connects the blade rear edge and the blade front edge is inclined with respect to a radial line of the main plate from the rotation center, whereina blade outer face, which is a face away from the rotation center of the blade, is formed on a projecting face projecting in a direction away from the rotation center, whereinthe blade front edge is divided into a main-plate-side blade front edge close to the main plate, a shroud-side blade front edge close to the shroud, and a projecting blade front edge formed between the main-plate-side blade front edge and the shroud-side blade front edge, whereinin a range of the main-plate-side blade front edge close to the main plate, a main-plate-side front-edge skirt portion is formed to distance away from the blade rear edge and incline away from the rotation center the closer it becomes to the main plate, whereinin a range farther away from the main plate than the main-plate-side front-edge skirt portion, a main-plate-side front-edge vertical portion perpendicular to the main plate is formed, whereinin a range farther away from the main plate than the main-plate-side front-edge vertical portion, with respect to the main-plate-side front-edge vertical portion, a main-plate-side front edge inclined portion is formed to distance away from the blade rear edge and incline away from the rotation center the farther it becomes to the main plate, whereina range closer to the main plate than a projecting front-edge end point of the projecting blade front edge continuing from the main-plate-side front edge inclined portion distances away from the blade rear edge and distances away from the rotation center the farther it becomes to the main plate, and whereina range farther away from the main plate than the projecting front edge end point of the projecting blade front edge continuing to the shroud-side blade front edge becomes closer to the blade rear edge and is distanced away from the rotation center the farther it becomes to the main plate.
1 Assignment
0 Petitions
Accused Products
Abstract
A blade front edge of a turbo fan has, between a main-plate-side blade front edge and a shroud-side blade front edge, a projecting blade front edge which distances away from a blade rear edge (located in a rotation direction A) as it furthers away from a main plate, which curves to a position away from a rotation center, and, in a range close to the main plate, a main-plate-side front-edge skirt portion which distances away from the blade rear edge and inclines away from the rotation center as it becomes closer to the main plate. On the other hand, a main-plate-side blade rear edge, which is a range close to the main plate of the blade rear edge, is substantially perpendicular to the main plate and a shroud-side blade rear edge, which is a range close to a shroud, is inclined so as to gradually distance away from the blade front edge (behind in the rotation direction A) as it furthers away from the main plate.
16 Citations
8 Claims
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1. A turbo fan comprising:
- a disk-shaped main plate provided with a rotation center at the center and a projecting boss formed in the vicinity of the rotation center;
a cylindrical shroud arranged opposite to the main plate and provided with a diameter expanded portion whose inner diameter becomes more expanded, the closer it becomes to the main plate; and a plurality of blades with one end and the other end joined to the main plate and the shroud respectively;
whereina blade rear edge of each blade is located on a virtual cylinder formed by an outer periphery of the main plate and an outer periphery of the shroud, a blade front edge of each blade is located closer to the rotation center than the blade rear edge of the blade, and a virtual line which connects the blade rear edge and the blade front edge is inclined with respect to a radial line of the main plate from the rotation center, wherein a blade outer face, which is a face away from the rotation center of the blade, is formed on a projecting face projecting in a direction away from the rotation center, wherein the blade front edge is divided into a main-plate-side blade front edge close to the main plate, a shroud-side blade front edge close to the shroud, and a projecting blade front edge formed between the main-plate-side blade front edge and the shroud-side blade front edge, wherein in a range of the main-plate-side blade front edge close to the main plate, a main-plate-side front-edge skirt portion is formed to distance away from the blade rear edge and incline away from the rotation center the closer it becomes to the main plate, wherein in a range farther away from the main plate than the main-plate-side front-edge skirt portion, a main-plate-side front-edge vertical portion perpendicular to the main plate is formed, wherein in a range farther away from the main plate than the main-plate-side front-edge vertical portion, with respect to the main-plate-side front-edge vertical portion, a main-plate-side front edge inclined portion is formed to distance away from the blade rear edge and incline away from the rotation center the farther it becomes to the main plate, wherein a range closer to the main plate than a projecting front-edge end point of the projecting blade front edge continuing from the main-plate-side front edge inclined portion distances away from the blade rear edge and distances away from the rotation center the farther it becomes to the main plate, and wherein a range farther away from the main plate than the projecting front edge end point of the projecting blade front edge continuing to the shroud-side blade front edge becomes closer to the blade rear edge and is distanced away from the rotation center the farther it becomes to the main plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- a disk-shaped main plate provided with a rotation center at the center and a projecting boss formed in the vicinity of the rotation center;
Specification