CA2951590C

CA2951590C - Air blower

Info

Publication number: CA2951590C
Application number: CA2951590A
Authority: CA
Inventors: Wei Lei; Zeyan JIANG; Shenglong GUO; Kunpan LIU; Shikun CHEN; Haoquan ZHOU; Jianhua Zeng; Qixiang XIANG; Xianjun Liu
Original assignee: Zhongshan Broad Ocean Motor Manufacturing Co Ltd
Current assignee: Zhongshan Broad Ocean Motor Manufacturing Co Ltd
Priority date: 2014-12-26
Filing date: 2015-04-21
Publication date: 2019-02-19
Anticipated expiration: 2035-04-21
Also published as: MX2016016286A; CN204402983U; CA2951590A1; WO2016101456A1

Abstract

An air blower comprises a motor (1), a volute casing (2), a cover plate (3) and a wind wheel (4). The volute casing (2) and the cover plate (3) are mounted together to form a cavity (21). The wind wheel (4) is arranged inside the cavity (21). The motor (1) is mounted on the volute casing (2), and the shaft extension end (11) of the motor (1) extends into the cavity (21) and is connected to the wind wheel (4). An air inlet (31) is formed in the center of the cover plate (3). An air outlet (22) is formed in the side surface of the volute casing (2). The air inlet (31) and the air outlet (22) are both communicated with the cavity (21). A plurality of annular protrusions (32) is arranged on the inner side wall surface of the cover plate (3) and is centered around the air inlet (31).
Therefore, air leakage between the wind wheel and the cover plate is effectively reduced, and the blowing efficiency of the air blower is improved.

Description

May. 1. 2018 8:52PM No. 2349 P. 13/21 AIR BLOWER
FIELD OF THE INVENTION
[0001] The utility model relates to an air blower.
BACKGROUND OF THE INVENTION

[0002] As shown in FIG. 1, in existing air blowers, to prevent the mechanical friction between the fan impeller Al and the cover plate A2 resulting from the bounce of the fart impeller Al, generally, there is clearance allowance between the fan impeller Al and the cover plate A2. Due to the viscosity, the gas is adapted to flow along the outer wall of the fan impeller Al, and enters the area of the air inlet A3 along the gap between the fan impeller Al and the cover plate A2, thus causing the leakage of the gas. As a result, the gap between the fan impeller Al and the cover plate A2 causes the loss of the air pressure and reduces the efficiency of the air blower.
SUMMARY OF ME INVENTION

[0003] In view of the above:described problems, it is one objective of the utility model to provide an air blower that can effectively reduce the gas leakage between the fan impeller and the cover plate, thus improving the blowing efficiency of the air blower.

[0004] To achieve the above objective, the following technical solutions are provided.

[0005] An air blower, comprises: a motor, a scroll casing, a cover plate, and a fan impeller. The scroll casing is integrated with the cover plate to form a chamber; the fan impeller is disposed in the chamber; the motor is disposed on the scroll casing; a drive end of the motor is inserted into the chamber and is connected to the fan impeller; an air inlet is disposed on the central part of the cover plate; an air outlet is disposed on a side surface of the scroll casing;
the air inlet and the air outlet communicate with the chamber; a plurality of annular lug bosses is disposed on an inner side wall surface of the cover plate and centers around the air inlet.

May. 1. 2018 8:52PM No, 2349 P. 14/21

[0006] Preferably, a height of the annular lug bosses is gradually decreased from a center of the cover plate to an outer edge of the cover plate.

[0007] Preferably, a cross-section of the annular lug bosses is triangular.

[0008] Preferably, a cross-section of the annular lug bosses is trapezoidal.

[0009] Preferably, an outer edge of the inner side wall surface of the cover plate is provided with an annular baffle; and a bottom of the fan impeller is inserted into the annular baffle.

[0010] Preferably, a top of the annular baffle is provided with a filleted corner.

[0011] Advantages of the air blower according to embodiments of the utility model are summarized as follows:

[0012] 1. A plurality of annular lug bosses is disposed on an inner side wall surface of the cover plate and centers around the air inlet, effectively reducing gas leakage between the fan impeller and the cover plate, thereby improving the blowing efficiency of the air blower.

[0013] 2. The height of the annular lug bosses is gradually decreased from a center of the cover plate to an outer edge of the cover plate. Jitter of the fan impeller gets obvious near the outer edge of the fan impeller, in order to reduce the mechanical friction between the fan impeller and the cover plate caused by jitter, the height of the annular lug bosses is gradually decreased from the center of the cover plate to the outer edge of the cover plate.

[0014] 3. An outer edge of the inner side wall surface of the cover plate is provided with an annular baffle. A bottom of the fan impeller is inserted into the annular baffle, so as to prevent the airflow from entering into the gap between the scroll casing and the fan impeller, further reducing gas leakage between the fan impeller and the cover plate, thereby improving the blowing efficiency of the air blower.

[0015] 4. The top of the annular baffle is provided with a filleted corner, thus reducing noise.

May. 1. 2018 8:52PM No. 2349 P. 15/21 BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is described liereinbelow with reference to the accompanying drawings, in which:

[0017] FIG. 1 is a schematic diagram of an air blower in the prior art;

[0018] FIG. 2 is a stereogram of an air blower in accordance with one embodiment of the utility model;

[0019] FIG. 3 is an exploded view of an air blower in accordance with one embodiment of the utility model;

[0020] FIG. 4 is top view of an air blower in accordance with one embodiment of the utility model;

[0021] FIG. 5 is a cross-sectional view taken from line A-A in FIG. 4;

[0022] FIG. 6 is a partial enlarged view taken from B-B part in FIG, 5; and

(0023] FIG. 7 is a stereogram of a cover plate in accordance with one embodiment of the utility model.
DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] For further illustrating the utility model, experiments detailing an air blower are described below. It should be noted that the following examples are intended to describe and not to limit the utility model.
Example 1

[0025] As shown in FIGS. 2-7, an air blower comprises a motor 1, a scroll casing 2, a cover plate 3, and a fan impeller 4. The scroll casing 2 is integrated with the cover plate 3 to form a chamber 21. The fan impeller 4 is disposed in the chamber 21. The motor 1 is disposed on the scroll casing 2. A drive end 11 of the motor 1 is inserted into the chamber 21 and is connected to the fan impeller 4. An air inlet 31 is disposed on the central put of the cover plate 3. An air outlet 22 May. 1. 2018 8:52PM No. 2349 P. 16/21 is disposed on a side surface of the scroll casing 2. The air inlet 31 and the air outlet 22 communicate with the chamber 21. A plurality of annular lug bosses 32 are disposed on an inner side wall surface of the cover plate 3 and centers around the air inlet 31. A
height of the annular lug bosses 32 is gradually decreased from a center of the cover plate 3 to an outer edge of the cover plate 3. The cross-section of the annular lug bosses 32 is triangular.
The cross-section of the annular lug bosses 32 is trapezoidal. An outer edge of the inner side wall surface of the cover plate 3 is provided with an annular baffle 33. A bottom of the fan impeller 4 is inserted into the annular baffle 33. The top of the annular baffle 33 is provided with a filleted corner 331.

Claims

1. An air blower, comprising: a motor (1), a scroll casing (2), a cover plate (3), and a fan impeller (4); wherein the scroll casing (2) is integrated with the cover plate (3) to form a chamber (21); the fan impeller (4) is disposed in the chamber (21); the fan impeller (4) comprises a flat impeller surface that is adjacent to and parallel to the cover plate (3); the motor (1) is disposed on the scroll casing (2); a drive end (11) of the motor (1) is inserted into the chamber (21) and is connected to the fan impeller (4); an air inlet (31) is disposed on a central part of the cover plate (3); art air outlet (22) is disposed on a side surface of the scroll casing (2); the air inlet (31) and the air outlet (22) communicate with the chamber (21);
characterized in that, a plurality of annular lug bosses (32) is disposed on the cover plate (3) and around the air inlet (31);
the annular lug bosses (32) protrude from the cover plate (3) towards the fan impeller (4);
the annular lug bosses (32) are disposed within a periphery of the flat impeller surface; and heights of the annular lug bosses (32) are decreased along a radial direction from a center of the cover plate (3) to a periphery of the cover plate (3).

2. The air blower of claim 1, characterized in that a cross-section of the annular lug bosses (32) is triangular.

3. The air blower of claim 1, characterized in that a cross-section of the annular lug bosses (32) is trapezoidal.

4. The air blower of claim 1, characterized in that the periphery of the cover plate (3) is provided with an annular baffle (33); and a bottom of the fan impeller (4) is inserted into the annular baffle (33).

5. The air blower of claim 4, characterized in that a top of the annular baffle (33) is provided with a filleted comer (331).