AIR BLOWER

SOUFFLANTE A AIR

English 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.

French Abstract

L'invention concerne une soufflante à air, laquelle soufflante comprend un moteur (1), une enceinte de volute (2), une plaque de capot (3) et une roue à vent (4). L'enceinte de volute (2) et la plaque de capot (3) sont montées ensemble afin de former une cavité (21). La roue à vent (4) est disposée à l'intérieur de la cavité (21). Le moteur (1) est monté sur le carter de volute (2), et l'extrémité d'extension d'arbre (11) du moteur (1) s'étend dans la cavité (21) et est reliée à la roue à vent (4). Une entrée d'air (31) est formée dans le centre de la plaque de capot (3). Une sortie d'air (22) est formée dans la surface latérale de l'enceinte de volute (2). L'entrée d'air (31) et la sortie d'air (22) communiquent avec la cavité (21). Une pluralité de saillies annulaires (32) sont disposées sur la surface de paroi latérale interne de la plaque de capot (3) et sont centrées autour de l'entrée d'air (31). Par conséquent, une fuite d'air entre la roue à vent et la plaque de capot est efficacement réduite, et l'efficacité de soufflage de la soufflante à air est améliorée.

Claims

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).
6

Description

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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.
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[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.
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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
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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.
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Representative Drawing