Ventilating fan

Patent metadata

Field	Value
Publication number	US-10047756-B2
Application number	US-201113634032-A
Country	US
Kind code	B2
Filing date	Feb 10, 2011
Priority date	Mar 17, 2010
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A ventilating fan includes a sirocco fan disposed in a box-shaped body and an adapter connected to an air outlet of the sirocco fan. The sirocco fan is composed of two opposite scroll plates with scroll shapes and a casing plate sandwiched between the two scroll plates. An overall air inlet of the sirocco fan is disposed on the first scroll plate and a central line of the air outlet of the adapter is offset towards the second scroll plate. The present invention is advantageous in that no turbulence is generated at the adapter and the wind amount of the ventilating fan is thus ensured and noise is reduced. Therefore, the present invention can provide a small air blowing device with high efficiency and improve stability of performance of the product.

First claim

What is claimed is:

1. A ventilating fan, comprising:
a sirocco fan disposed in a box-shaped body; and
an adapter connected to an air outlet of the sirocco fan, the adapter having a D-shaped air inlet and a round air outlet, the ventilating fan is characterized in that the sirocco fan is composed of two opposite scroll plates with scroll shapes and a casing plate sandwiched between the two scroll plates, an overall air inlet of the sirocco fan is disposed on the first scroll plate, and a central line of the air outlet of the adapter is offset towards the second scroll plate; and
an outside edge of the air inlet of the adapter is aligned with an end surface of the second scroll plate, and a projection of the air outlet of the adapter toward the air inlet of the adapter is within the air inlet of the adapter and connected to the outside edge of the air inlet; and
a smooth transition structure is formed between the D-shaped air inlet and the round air outlet;
wherein the air inlet of the adapter is greater in size than the air outlet of the adapter;
wherein a straight edge of the D-shaped air inlet of the adapter is aligned with the end surface of the second scroll plate;
wherein the casing plate comprises a tongue portion at a position closest to an outer circumference of fan blades of the sirocco fan as viewed in a radial direction, and an expanding portion expanded from the tongue portion to an air outlet of the sirocco fan in a rotating direction of the fan blades;
wherein a flexural portion to bend an air flowing direction is formed by the casing plate and the adapter in a wind path between the expanding portion of the sirocco fan and the air outlet of the adapter, and
wherein the expanding portion extends to an opposite side relative to the tongue portion to provide a first straight portion of the casing plate;
the opposite side relative to the tongue portion linearly extends towards the air outlet of the ventilating fan to provide a second straight portion of the casing plate;
the tongue portion linearly extends towards the air outlet of the ventilating fan in an expanding direction of a sidewall of the casing plate to provide a third straight portion of the casing plate;
wherein from an upstream side to a downstream side of the air flowing direction, the first straight portion is inclined inwardly in a narrowing direction of the sidewall of the casing plate with respect to a line connecting a center of the fan blades and the tongue portion, and the second straight portion is inclined inwardly in a further narrowing direction of the sidewall of the casing plate with respect to the first straight portion, a round portion of the adapter is outwardly inclined in the expanding direction of the sidewall of the casing plate with respect to the second straight portion, and the round portion of the adapter is inwardly inclined in the narrowing direction of the sidewall of the casing plate with respect to the third straight portion,
the first and second straight portions at a peripheral portion of the casing plate form a first bending portion to as a whole inwardly bend the wind path in the narrowing direction of the sidewall of the casing plate, the second straight portion and the round portion of the adapter form a second bending portion to outwardly bend the wind path in the expanding direction of the sidewall of the casing plate, and the third straight portion and the round portion of the adapter form a third bending portion to inwardly bend the wind path in the narrowing direction of the sidewall of the casing plate, such that the first bending portion and the second bending portion are bent in opposite directions, and the second bending portion and the third bending portion are bent in a same direction; and
the first, second and third bending portions form the flexural portion.

2. The ventilating fan according to claim 1 , wherein the first bending portion and the second bending portion are on an opposite side relative to the tongue portion, and are continuous to each other and bend the air flowing direction.

3. The ventilating fan according to claim 1 , wherein
a bending extent of the second bending portion is smaller than that of the first bending portion.

4. The ventilating fan according to claim 1 , wherein the adapter comprises an air guiding structure and a shutter mounted inside the air guiding structure, the air guiding structure is divided into two parts: the air inlet and the air outlet,
wherein a sidewall forms the smooth transition structure between the air inlet and the air outlet, a shape of the air inlet is the same as a shape of the air outlet of the sirocco fan so as to form a directly communicating structure for connection;
wherein the shutter has an arcuate structure bending from a center to both sides so as to match the shape of the air outlet; and
wherein the shutter is fixed on an indoor side of the air outlet.

5. The ventilating fan according to claim 4 , wherein the projection of the air outlet of the air guiding structure toward the air inlet of the air guiding structure is within the air inlet of the air guiding structure and is offset to be connected with an edge of the air inlet of the air guiding structure.

6. The ventilating fan according to claim 4 , wherein a central axis of the air outlet of the air guiding structure is offset towards the air inlet relative to the central axis of the air inlet of the air guiding structure.

7. The ventilating fan according to claim 4 , wherein the air guiding structure is integrally formed by injection moulding with a resin.

8. The ventilating fan according to claim 4 , wherein retainers are provided around the air guiding structure to fix the adapter inside a metal adapter.

9. The ventilating fan according to claim 4 , wherein retainers are provided around the air guiding structure, the retainers comprise a plurality of elastic clips disposed on the periphery of the adapter of which each front end is provided with a protrusion, and a wall of an air outlet of a metal adapter is provided with a plurality of openings at positions corresponding to the protrusion.

10. The ventilating fan according to claim 4 , wherein the shutter is provided with air guiding sheets both on a lower surface of the shutter adjacent to the outdoor side and on an upper surface of the shutter adjacent to the indoor side.

11. The ventilating fan according to claim 1 , wherein the central line of the air outlet of the adapter is offset from a central line of the air inlet of the adapter.

12. The ventilating fan according to claim 11 , wherein the central line of the air inlet of the adapter is aligned with a central line of the air outlet of the sirocco fan.

13. The ventilating fan according to claim 11 , wherein the central line of the air outlet of the adapter is positioned closer to the end surface of the second scroll plate than the central line of the air inlet of the adapter.

14. The ventilating fan according to claim 1 , wherein an outside edge of the air outlet of the adapter is aligned with the end surface of the second scroll plate.

Assignees

• Yang Zhenjian
• Gao Shouyong
• Yang Jingtao
• Long Min
• Rao Zewei
• Zhu Jianrong
• Panasonic Eco Sys Guangdong Co
• Panasonic Corp

Inventors

• Yang Zhenjian
• Gao Shouyong
• Yang Jingtao
• Long Min
• Rao Zewei
• Zhu Jianrong

Classifications

• F04D29/626

  Mounting or removal of fans · CPC title

• F04D25/08 Primary

  the working fluid being air, e.g. for ventilation · CPC title

• F05D2250/51

  Inlet · CPC title

• F04D29/663

  Sound attenuation · CPC title

• F04D29/4226

  Fan casings · CPC title