TWI789564B - Extraction motor for dust extraction unit - Google Patents

Abstract

A suction motor for a dust collection device, comprising an electric motor and an air barrel connected to the electric motor, the electric motor has a motor housing and a drive shaft, the air barrel defines an air inlet side and a side facing the electric motor On the air outlet side, the air barrel is provided with at least one rotatable fan blade connected to the drive shaft, and the rotatable fan blade is driven by the drive shaft to generate a high-pressure airflow flowing from the air inlet side to the air outlet side. The air barrel is provided with a guide end plate on the air outlet side, and the guide end plate forms a plurality of guide channels, each of which has an inlet and an outlet, and the inlet is located on the original output path of the high-pressure airflow, Each of the guide passages diverts the high-pressure airflow to flow toward the motor casing, so that the high-pressure airflow turns into a cooling airflow capable of exchanging heat with the motor casing.

Description

Extraction motor for dust extraction unit

The invention relates to a suction motor of a dust collection device, in particular to a suction motor which can be used in both dry and wet environments by changing the gas flow path and the structure of the motor casing.

When the exhaust motor of the existing dust collection device is in operation, at least one rotatable fan is driven by an electric motor. When the rotatable fan rotates, the central area of the front end of the fan blade will form a negative pressure area, so that the external air is affected by the pressure difference toward the negative pressure area. The compressed area flows and is drawn into the rotatable fan, and then the air is centrifugally discharged along the blade surface. In addition, in order to precisely and effectively control the direction of air flow and increase the diversion rate of the air, most of the existing air exhaust motors assemble the rotatable fan in an air barrel, and the size of an opening opened by the air barrel and the The distance between the opening and the rotatable fan is used to change the air volume and air negative pressure value inside the air barrel. Further, the air bucket is provided with at least one air outlet hole communicating with the outside on the side facing the drive shaft, and the air outlet hole allows the air entering the air bucket to be discharged to the outside.

Also, the existing air exhaust motor can be divided into a straight-through air exhaust motor (Thu-flow Motor) that can only be used to suck dry air and a Thu-flow motor that can be used to suck dry air and humid air according to the location of the air outlet. By-pass Motor for gas. Firstly, the straight-through ventilation motor is described. The air outlet of the straight-through ventilation motor is set corresponding to the electric motor. When the air enters the air barrel, it will be directly discharged toward the direction facing the electric motor. The straight-through ventilation motor can discharge the air to the direction of the electric motor while dissipating heat from the electric motor, as disclosed in TW 428845. But, because the air discharged by the conventional straight-through type ventilation motor directly blows the electric motor, the conventional straight-through type ventilation motor It can only absorb air that does not contain a lot of moisture, which is commonly known as dry air, otherwise it will cause damage to the electric motor due to moisture and short circuit. Furthermore, according to the structure disclosed in TW 428845, it can be found that the electric motor is not provided with a casing, that is, the stator and rotor of the electric motor are exposed outside without being shielded.

On the other hand, the bypass-type ventilation motor is provided with the outlet hole on one side of the air barrel, as disclosed in patents such as US 6166462, US 20020140297, CN 106968970A and EP 1025792B1. In addition, when this type of air suction motor is implemented, the air entering the air barrel will be discharged to the outside from the side of the air barrel. Although the bypass type air suction motor absorbs humid air containing a large amount of moisture, its electric motor will not be affected by it. Moisture in the air causes a short circuit due to humidity. However, in this type of fan motor, the air discharged from the air bucket cannot be blown to the electric motor, so that the heat generated by the electric motor cannot be dissipated quickly.

The main purpose of the present invention is to solve the problem that the conventional straight-through ventilation motor can dissipate heat from its electric motor but cannot be used in a humid environment.

The main purpose of the present invention is to solve the problem that although the bypass type ventilation motor can be used in a humid environment, it cannot dissipate heat from its electric motor.

In order to achieve the above purpose, the present invention provides a suction motor of a dust collector, comprising an electric motor and an air barrel connected to the electric motor, the electric motor has a motor housing and a drive shaft, the air barrel defines an air inlet On the air outlet side of the electric motor, at least one rotatable fan blade connected to the drive shaft is arranged in the air barrel, and the rotatable fan blade is driven by the drive shaft to generate a flow from the air inlet side to the For the high-pressure airflow on the air outlet side, the air barrel is provided with a guide end plate on the air outlet side, and the guide end plate forms a plurality of guide channels, and an inlet of each guide channel is located in the original output path of the high-pressure air flow On, an outlet of each guide channel is connected with the The inlets are located on different axes and close to the motor casing, and each of the guide passages diverts the high-pressure airflow to flow toward the motor casing, turning the high-pressure airflow into a cooling airflow capable of exchanging heat with the motor casing.

In one embodiment, the deflector end plate includes a basic deflector and an airflow turning plate arranged on the basic deflector, and the basic deflector is formed with a plurality of perforations as one of the inlets and a plurality of The guide slots on the side of the basic guide plate facing the electric motor, the perforations are located in the projection of the airflow diversion plate, and the part of each guide slot not covered by the airflow diversion plate forms the guide This exit of the channel.

In one embodiment, the inlet of each flow guide channel is located outside the flow guide end plate.

In one embodiment, the flow guide channels are radially arranged with the center of the flow guide end plate as the origin.

In one embodiment, a plurality of cooling fins are formed on the motor housing.

In one embodiment, the motor casing is composed of a hollow tube body and an end cover disposed on one side of the hollow tube body.

In one embodiment, the projected portion of each cooling fin located on the outer edge of the hollow tube is located at the outlet of one of the flow guide channels.

In one embodiment, the electric motor includes a circuit board placed horizontally in the hollow tube, a stator arranged on the inner edge of the hollow tube and assembled with the circuit board, and a stator located in the hollow tube and assembled Connect the rotor of the drive shaft.

In one embodiment, the guide end plate has an opening through which the drive shaft passes, and a ring wall surrounding the opening and providing the hollow tube body on it.

In one embodiment, the electric motor has a first bearing arranged on the end cover and assembled with the drive shaft, and the guide end plate has a second bearing with a corresponding through hole and assembled with the drive shaft. Palin.

In one embodiment, each of the diversion channels is provided with a diversion slope at the outlet.

In one embodiment, the air barrel is provided with a plurality of the rotatable fan blades and at least one fixed fan blade located between any two adjacent rotatable fan blades.

According to the content of the foregoing invention, compared with the conventional technology, the present invention has the following characteristics: the present invention changes the airflow path of the air motor and changes the structure of the electric motor at the same time, so that the air motor can be used to suck water that does not contain a large amount of water at the same time. air (commonly known as dry air) and moist air. More specifically, the present invention changes the configuration of the motor casing. When the present invention is used to absorb humid air, the motor casing covers and closes its internal space, so that humid air cannot enter the electric motor. At the same time, the present invention is guided by the guide end plate through the high-pressure airflow, so that when the high-pressure airflow is discharged from the air outlet side, the high-pressure airflow is turned and converted into the heat-dissipating airflow flowing toward the motor casing, thereby making the The heat dissipation air can simultaneously dissipate heat from the electric motor when discharged from the air bucket.

10: Ventilation motor

11: Electric motor

111: Motor housing

112: drive shaft

113: threaded part

114: circuit board

115: rotor

116: stator

117: Coil

118: metal parts

119: hollow tube body

120: end cap

121: Assembly hole

122: Gap

123: The first bearing

124: opening

125: cooling fins

13: wind barrel

131: Inlet side

132: Outlet side

133: Rotatable fan blade

134: diversion end plate

135: diversion channel

136: Entrance

137: export

138: vertical spool

139: vertical spool

140:Basic deflector

141: Airflow turning plate

143: perforation

144: diversion groove

145: Projection position

146: assembly hole

147: Components

148: lug

149: Mounting hole

150: opening

151: ring wall

152: Second Palin

153: fixed fan blade

154: the first rotatable fan blade

155: the second rotatable fan blade

156: Via

157: diversion structure

158: diversion slope

60: External airflow

61: High pressure airflow

62: cooling airflow

Fig. 1 is a schematic diagram of an exploded structure of an embodiment of the present invention.

Fig. 2 is a schematic view of the wind flow direction according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional structure diagram of an embodiment of the present invention.

Fig. 4 is a schematic top view of the ventilation motor according to an embodiment of the present invention. .

Fig. 5 is a schematic top view of a flow guide end plate according to an embodiment of the present invention.

Fig. 6 is a schematic exploded view of the structure of the second embodiment of the present invention.

Fig. 7 is a schematic view of the wind flow direction of the second embodiment of the present invention.

Fig. 8 is a schematic cross-sectional structure diagram of the second embodiment of the present invention.

Fig. 9 is a schematic cross-sectional structure diagram of the third embodiment of the present invention.

The detailed description and technical content of the present invention are described as follows in conjunction with the drawings: In this article, the terms "first" and "second" used for components are intended to distinguish these components and are not used to limit these components. sequence. In addition, the relative spatial terms such as "top", "bottom edge", "upward" and "downward" mentioned later in this article are based on the directions drawn in the drawings in this article. The direction of drawing on the surface changes. For example, once the pattern in this figure is placed horizontally, the original "top" and "bottom" will be changed to "left" and "right" respectively.

Please refer to Fig. 1 to Fig. 4, the present invention provides a kind of suction motor 10, and this suction motor 10 can be applied on a dust suction device (not shown in the figure), and this dust suction device can be used for sucking the air that does not contain a large amount of moisture (that is commonly known as dry air) or moist air containing a lot of moisture. The exhaust motor 10 includes an electric motor 11 and an air bucket 13 connected with the electric motor 11. Specifically, the electric motor 11 has a motor housing 111 and a drive shaft 112, and the motor housing 111 is used for the drive shaft 112. Through it, two ends of the drive shaft 112 are provided with a threaded portion 113 for the drive shaft 112 to be assembled. In one embodiment, the electric motor 11 includes a circuit board 114 disposed in the motor housing 111 through which the drive shaft 112 passes, a rotor 115 disposed in the motor housing 111 and assembled with the drive shaft 112 and A stator 116 connected to the rotor 115 and assembled with the circuit board 114, the stator 116 further includes a coil 117 assembled with at least one assembly hole 121 of the circuit board 114 and a metal piece 118 connected to the coil 117, The metal piece 118 is what is known as a silicon steel sheet by those skilled in the art. The electric motor 11 is driven after receiving a working power, and makes the driving shaft 112 start to rotate. yet another In the embodiment, the motor casing 111 is composed of a hollow tube body 119 and an end cap 120 disposed on one side of the hollow tube body 119, the hollow tube body 119 is used for the circuit board 114 to be placed horizontally therein, and in addition , the hollow tube body 119 and the end cover 120 jointly cover the rotor 115 and the stator 116 , so that the rotor 115 and the stator 116 cannot be observed from the top of the electric motor 11 . As a further example, the motor casing 111 further has a notch 122 disposed on the hollow tube body 119 and allowing part of the circuit board 114 to protrude from the hollow tube body 119 . In addition, the motor casing 111 has a first bearing 123 disposed on the end cover 120 and assembled with the drive shaft 112 . Moreover, the motor housing 111 can further have an opening 124 on the side of the end cover 120 where the first bearing 123 is not provided, and the opening 124 allows the drive shaft 112 to pass through the motor housing 111 .

Also, the air bucket 13 is located on one side of the electric motor 11 and is assembled with the motor casing 111. The air bucket 13 defines an air inlet side 131 and an air outlet side 132 facing the electric motor 11. The barrel 13 is provided with at least one rotatable fan blade 133 (Rotating Fan) connected to the drive shaft 112 and a flow guide end plate 134 on the air outlet side 132, the rotatable fan blade 133 is driven by the drive shaft 112 and rotate, the guide end plate 134 is assembled with the side of the motor housing 111 that is not provided with the end cover 120, so that the guide end plate 134 serves as the other end cover 120 of the motor housing 111 and thereby closes the motor housing 111. Hollow pipe body 119. The air guide end plate 134 forms a plurality of air guide channels 135 located at the air outlet side 132. For example, the air guide channels 135 are arranged at intervals from each other and spiral radially with the center of the air guide end plate 134 as the origin. arrangement. Also, each of the diversion passages 135 has an inlet 136 and an outlet 137, the inlet 136 and the outlet 137 are located on the same level, and the inlet 136 and the outlet 137 of each diversion passage 135 are respectively located on two different sides. On the intersecting vertical axes ( 138 , 139 ), more specifically, the outlet 137 is located at a position near the motor housing 111 of each flow guide channel 135 , and the inlet 136 is located outside the flow guide channel 135 .

Next, referring to FIG. 2 again, the embodiment of the ventilation motor 10 of the present invention will be described. Firstly, it is assumed that at the beginning, the ventilation motor 10 receives the operating power to drive the drive shaft 112 to start running. At this time, because the air barrel 13 is affected by the rotation of the rotatable fan blade 133, a negative pressure area is generated on the wind inlet side 131, and an external airflow 60 located in the negative pressure area is affected by the negative pressure of the air and enters the air bucket 13. In the air bucket 13. Afterwards, the external airflow 60 is driven by the rotatable fan blade 133, so that the external airflow 60 is centrifugally accelerated along the surface of the rotatable fan blade 133 and flows toward the outer edge of the rotatable fan blade 133. At this time, the external airflow 60 will be affected by It is pressurized and transformed into a high-pressure air stream 61 by centrifugal action. The high-pressure airflow 61 located on the outer edge of the rotatable fan blade 133 hits the inner wall of the air bucket 13 , causing the high-pressure airflow 61 to turn. Moreover, the inlet 136 of each guide channel 135 is located on the original output path of the high-pressure airflow 61, that is, the high-pressure airflow 61 can directly flow to one of the inlets 136 along the inner wall of the air barrel 13, and then enter the guide. In flow channel 135. The high-pressure airflow 61 is continuously guided by the guide passage 135 to flow toward the outlet 137, the high-pressure airflow 61 at the outlet 137 is guided by the guide passage 135 and turns, and the high-pressure airflow 61 turns after turning It turns into a cooling air flow 62 . The cooling airflow 62 flows in a direction facing the motor casing 111 and exchanges heat with the motor casing 111 .

Accordingly, the present invention changes the airflow path of the air exhaust motor 10 and simultaneously changes the structure of the electric motor 11, so that the air exhaust motor 10 can be used to suck air that does not contain a lot of moisture (that is, commonly known as dry air) and air that contains a lot of moisture. of humid air. More specifically, the present invention utilizes the arrangement of the motor housing 111 . When the present invention is used to absorb humid air, the motor housing 111 covers and closes its internal space, so that humid air cannot enter the interior of the electric motor 11 . At the same time, the present invention is guided by the guide end plate 134 through the high-pressure airflow 61, so that when the high-pressure airflow 61 is discharged from the air outlet side 132, the high-pressure airflow 61 turns and turns toward the motor. The heat dissipation airflow 62 flowing through the casing 111 enables the heat dissipation airflow 62 to simultaneously dissipate heat to the electric motor 11 when it is discharged from the air bucket 13 .

Referring back to FIGS. 1 to 5 , in one embodiment, the deflector end plate 134 includes a basic deflector 140 and an airflow turning plate 141 disposed on the basic deflector 140 , specifically, the base The deflector 140 is formed with a plurality of perforations 143 respectively serving as one of the inlets 136 and a plurality of flow guide grooves 144 on the side of the basic deflector 140 facing the electric motor 11. These perforations 143 are located at the direction where the airflow turns within the projection of the plate 141 (shown at 145 in FIG. 5 ). Moreover, the airflow turning plate 141 is an annular structure, that is, the airflow turning plate 141 does not completely cover the basic deflector 140, and the airflow turning plate 141 makes each part of the flow guiding groove 144 that is not covered form the guide. The outlet 137 of the flow channel 135 . On the other hand, the portion of each flow guide groove 144 that is not shielded by the airflow turning plate 141 determines the size of the outlet 137 of the flow guide channel 135 . If the part of each guide groove 144 is covered for a long time, the area of the outlet 137 is reduced toward the direction facing the motor casing 111, so that the heat dissipation airflow 62 is guided by the airflow turning plate 141 and is closer to the motor casing 111 . On the contrary, the cooling air flow 62 is relatively away from the motor housing 111 . Moreover, in one embodiment, in order to make the airflow diversion plate 141 and the basic deflector 140 stably assembled, the basic deflector 140 is formed with at least one assembly hole 146, and the airflow diversion plate 141 is provided with at least one The assembly hole 146 is assembled with the assembly piece 147 . In addition, the basic deflector 140 has at least one lug 148 disposed on the outer edge and protruding away from the electric motor 11 and at least one mounting hole 149 disposed on the lug 148 through which the mounting hole The arrangement of 149 enables the basic deflector 140 to be assembled on the dust suction device.

3 to 5 again, in one embodiment, the guide end plate 134 is for the drive shaft 112 to pass through, and the guide end plate 134 has an opening for the drive shaft 112 to pass through. 150 and a hole that surrounds the opening 150 and allows the hollow tube body 119 to be placed on it Ring wall 151. More specifically, the guide end plate 134 forms the opening 150 at its central position, and the guide end plate 134 controls the position of the drive shaft 112 in the opening 150, and the guide end plate 134 is positioned at the opening 150. The opening 150 is further provided with a second bushing 152 assembled with the driving shaft 112. The present invention can reduce the distance between the driving shaft 112 and the deflector end plate 134 by setting the second bushing 152 so that the driving shaft 112 rotates. friction. In addition, the guide end plate 134 is to close the hollow tube body 119, so that the outer diameter of the ring wall 151 corresponds to the inner diameter of the hollow tube body 119, so that the ring wall 151 contacts the hollow tube body 119. The inner walls are assembled and simultaneously closed the hollow tube body 119 , so that the moisture in the heat dissipation airflow 62 will not enter into the hollow tube body 119 .

On the other hand, please refer to FIGS. 3 to 5 again. In one embodiment, in order to guide the cooling airflow 62 to flow towards the direction of the motor housing 111, a plurality of cooling fins 125 are formed on the motor housing 111. These cooling fins The fins 125 are radially arranged with the center of the motor housing 111 as the origin, and the extending direction of each cooling fin 125 is parallel to the extending direction of the hollow tube body 119 . The projected portion of each cooling fin 125 is located at the outlet 137 of one of the guide channels 135, so that the cooling airflow 62 discharged from the outlet 137 can move along one of the cooling fins 125 toward the outlet 137. direction flow. To further explain, when the heat dissipation airflow 62 flows away from the outlet 137, the heat dissipation airflow 62 is not only guided by one of the heat dissipation fins 125, the heat dissipation airflow 62 is also guided by the heat dissipation fins 125 and the aforementioned The restriction of the adjacent fins 125 enables the heat dissipation airflow 62 to flow away from the outlet 137 reliably.

On the other hand, referring to Fig. 6 to Fig. 8 again, in another embodiment of the present invention, in order to increase the pressurization effect of the air barrel 13, the air barrel 13 is provided with a plurality of the rotatable fan blades 133 and at least A stationary fan (Stationary Fan) 153 located between any two adjacent rotatable fan blades 133 . Taking this implementation as an example, there are two rotatable fan blades 133 inside the air bucket 13 for And the fixed blade 153 located between the rotatable blades 133 . Also, for the convenience of description later, the present invention divides the two rotatable fan blades 133 into the first rotatable fan blade 154 with one side facing the wind inlet side 131 and one side facing the wind outlet side 132. The second rotatable fan blade 155. In addition, the fixed blade 153 has a through hole 156 through which the high-pressure airflow 61 passes. The first rotatable blade 154 and the second rotatable blade 155 are simultaneously driven by the drive shaft 112 to oppose the fixed blade. 153 rotates, so that the external airflow 60 enters the air bucket 13 from the wind inlet side 131 under the action of the first rotatable fan blade 154 and the second rotatable fan blade 155 . Next, the first rotatable fan blade 154 drives the external airflow 60 to flow along the surface of the first rotatable fan blade 154 , and at the same time, the external airflow 60 is accelerated towards the outer edge of the first rotatable fan blade 154 by centrifugal action, The external airflow 60 is converted into the high-pressure airflow 61 after being pressurized for the first time. Next, the fixed fan blade 153 guides the high-pressure airflow 61 to be diverted from the first rotatable fan blade 154 and flow to the second rotatable fan blade 155 through the through hole 156, and the second rotatable fan blade 155 also drives The high-pressure airflow 61 centrifugally flows along its surface, thereby making the high-pressure airflow 61 pressurized for the second time. Thereafter, the high-pressure airflow 61 after the secondary pressurization flows out from the air outlet side 132 and turns into the cooling airflow 62 , so that the cooling airflow 62 can perform heat exchange with the motor housing 111 . Accordingly, the present invention pressurizes the high-pressure airflow 61 through each of the rotatable fan blades 133. When the present invention is provided with a plurality of the rotatable fan blades 133, the supercharging effect of the high-pressure airflow 61 is accumulated. . Furthermore, in one embodiment, the fixed fan blade 153 may be provided with at least one flow guide structure 157, and the flow guide structure 157 is arranged radially and spirally around the through hole 156, so as to guide the high-pressure airflow 61 toward the Flow through the hole 156 direction.

On the other hand, please refer to FIG. 9 , in yet another embodiment of the present invention, each of the flow guide grooves 144 can be provided with a flow guide slope 158 at the outlet 137, more specifically, the flow guide slope 158 The side facing the inlet 136 is a high point, and the guide slope 158 faces the outlet 137 One side is the low point. During implementation, the side of the guide slope 158 facing the inlet 136 receives the high-pressure airflow 61 to flow thereon, and makes the high-pressure airflow 61 flow along the guide slope 158 toward the direction facing the outlet 137, thereby making The high-pressure airflow 61 flows toward the motor casing 111 when flowing out of the outlet 137 .

In summary, it is only a preferred embodiment of the present invention, and should not limit the scope of the present invention, that is, all equivalent changes and modifications made according to the patent scope of the present invention should still belong to the present invention patent coverage.

10: Ventilation motor

11: Electric motor

111: Motor housing

112: drive shaft

113: threaded part

114: circuit board

115: rotor

116: stator

117: Coil

118: metal parts

119: hollow tube body

120: end cap

123: The first bearing

124: opening

125: cooling fins

13: wind barrel

131: Inlet side

132: Outlet side

133: Rotatable fan blade

134: diversion end plate

135: diversion channel

136: Entrance

137: export

138: vertical spool

139: vertical spool

140:Basic deflector

141: Airflow turning plate

143: perforation

150: opening

152: Second Palin

Claims (11)

A suction motor for a dust collection device, comprising: an electric motor with a motor casing and a drive shaft, a plurality of heat dissipation fins are formed on the motor casing, and an edge along the motor casing is formed between any two adjacent heat dissipation fins. and an air barrel connected to the electric motor, the air barrel defines an air inlet side and a side of the electric motor outlet air side, the air barrel is provided with at least one movable shaft connected to the drive shaft Rotating Fan, the rotatable fan blade is driven by the drive shaft to generate a high-pressure airflow flowing from the air inlet side to the air outlet side, the air barrel is provided with a guide end plate on the air outlet side, the The diversion end plate forms a plurality of diversion channels on the air outlet side, an inlet of each diversion channel is located on the original output path of the high-pressure air flow, an outlet of each diversion channel and the inlet are respectively located on two sides On non-intersecting axes, and at least a portion of each of the outlets faces the gap, each of the flow guiding passages turns the high-pressure airflow to flow toward the motor housing, so that the high-pressure airflow is turned along at least one of the gaps and A cooling airflow that exchanges heat with the motor housing. The suction motor of the dust collection device as claimed in claim 1, wherein the deflector end plate includes a basic deflector and an airflow turning plate arranged on the basic deflector, and the basic deflector is formed with a plurality of The perforation as one of the inlets and a plurality of flow guide grooves on the side of the basic deflector facing the electric motor, these perforations are located in the projection of the airflow turning plate, each of the flow guide grooves is not covered by the airflow The part covered by the turning plate forms the outlet of the flow guide channel. As claimed in claim 1 or 2, the suction motor of the dust suction device, wherein the inlet of each flow guide channel is located outside the flow guide end plate. The suction motor of the dust suction device as claimed in claim 1 or 2, wherein the guides The flow channels are radially arranged with the center of the flow guide end plate as the origin. According to claim 1, the suction motor of the dust suction device, wherein the motor casing is composed of a hollow tube body and an end cover provided on one side of the hollow tube body. The suction motor of the dust suction device as claimed in claim 1, wherein the projected portion of each heat dissipation fin located on the outer edge of the hollow tube is located at the outlet of one of the flow guide channels. The suction motor of the dust suction device according to claim 6, wherein the electric motor includes a circuit board placed horizontally in the hollow tube, a stator arranged on the inner edge of the hollow tube and assembled with the circuit board, and A rotor located in the hollow tube and assembled with the drive shaft. The suction motor of the dust suction device as claimed in claim 7, wherein the deflector end plate has an opening through which the drive shaft passes, and a ring wall that surrounds the opening and provides the hollow pipe body on it . The suction motor of the dust collection device according to claim 8, wherein the electric motor has a first bearing arranged on the end cover and assembled with the drive shaft, and the guide end plate has a pair of corresponding perforations and The second bearing assembled with the drive shaft. The suction motor of the dust suction device as claimed in claim 1, wherein each flow guiding channel is provided with a flow guiding slope at the outlet. The suction motor of the dust collection device according to claim 1, wherein the air barrel is provided with a plurality of the rotatable fan blades and at least one stationary fan blade (Stationary Fan) located between any two adjacent rotatable fan blades.

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