CN112943698A

CN112943698A - Air suction motor of dust suction device

Info

Publication number: CN112943698A
Application number: CN201911268058.3A
Authority: CN
Inventors: 陈邦和
Original assignee: Ding Peng Enterprise Co ltd
Current assignee: Ding Peng Enterprise Co ltd; Xpole Precision Tools Inc
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2021-06-11

Abstract

The invention discloses an air draft motor of a dust suction device, which comprises an electric motor and an air bucket connected with the electric motor, the electric motor is provided with a motor shell and a driving shaft, the wind barrel is defined with a wind inlet side and a wind outlet side facing the electric motor, at least one rotatable fan blade connected with the driving shaft is arranged in the wind barrel, the rotatable fan blade is driven by the driving shaft to generate high-pressure airflow flowing from the wind inlet side to the wind outlet side, the wind barrel is provided with a flow guiding end plate at the wind outlet side, the flow guiding end plate forms a plurality of flow guiding channels, each flow guiding channel is provided with an inlet and an outlet, the inlet is positioned on the original output path of the high-pressure airflow, and each flow guide channel enables the high-pressure airflow to turn to flow towards the motor shell, so that the high-pressure airflow is converted into a heat dissipation airflow capable of generating heat exchange with the motor shell.

Description

Air suction motor of dust suction device

Technical Field

The present invention relates to an air suction motor for a dust suction apparatus, and more particularly, to an air suction motor which changes a flow path of air and a structure of a motor housing to be used in a dry and wet environment at the same time.

Background

When the suction motor of the existing dust collector is operated, an electric motor is mainly used for driving at least one rotatable fan, when the rotatable fan rotates, a negative pressure area is formed in the central area of the front end of each fan blade, so that outside air flows towards the negative pressure area under the action of pressure difference and is drawn into the rotatable fan, and then the outside air is centrifugally discharged along the blade surface of each fan blade. In order to precisely and effectively control the air flowing direction and increase the air guiding rate, the conventional suction motor usually has the rotatable fan assembled in an air barrel, and the air amount and the air negative pressure value inside the air barrel are changed by the size of the opening formed in the air barrel and the distance between the opening and the rotatable fan. Furthermore, the wind barrel is provided with at least one wind outlet hole communicated with the outside at one side facing the driving shaft, and the wind outlet hole is used for discharging the air entering the wind barrel outwards.

In addition, the conventional suction Motor may be divided into a through-flow suction Motor (Thu-flow Motor) that can only suck dry air and a bypass-flow suction Motor (By-pass Motor) that can suck dry air and wet air according to the position of the air outlet. First, the through-type ventilation motor is described, in which the air outlet hole of the through-type ventilation motor is disposed corresponding to the electric motor, and air is discharged directly toward the electric motor after entering the air tub. The straight-through type draft motor can radiate heat to the electric motor while discharging air to the electric motor, as disclosed in taiwan patent TW 428845. However, since the air exhausted from the conventional straight-through type suction motor directly blows the electric motor, the conventional straight-through type suction motor can only suck the air without a large amount of moisture, i.e., the dry air, otherwise the electric motor is damaged due to the moisture short circuit. Furthermore, according to the structure disclosed in taiwan patent TW428845, it is found that the electric motor is not provided with a housing, that is, the stator and the rotor of the electric motor are exposed without being shielded.

On the other hand, the bypass type suction motor has the air outlet hole disposed at one side of the air barrel, as disclosed in US 6166462, US 20020140297, CN 106968970a, EP 1025792B1, and the like. In addition, when the suction motor of the type is implemented, the air entering the air barrel is discharged to the outside from the side edge of the air barrel, although the bypass type suction motor can not cause a damp short circuit because of the moisture in the air when the bypass type suction motor absorbs the damp air containing a large amount of moisture. However, in this type of the suction motor, since the air discharged from the tub is not blown to the electric motor, the heat generated when the electric motor is operated cannot be rapidly dissipated.

Disclosure of Invention

The main purpose of the invention is to solve the problem that the conventional straight-through type exhaust motor can not be used in a humid environment though the heat of the electric motor can be dissipated.

The invention mainly aims to solve the problem that although the bypass type exhaust motor can be used in a humid environment, the bypass type exhaust motor cannot radiate heat of an electric motor.

To achieve the above object, the present invention provides an air suction motor of a dust collector, comprising an electric motor and an air barrel connected to the electric motor, wherein the electric motor has a motor housing and a driving shaft, the air barrel defines an air inlet side and an air outlet side facing the electric motor, the air barrel is provided therein with at least one rotatable blade connected to the driving shaft, the rotatable blade is driven by the driving shaft to generate a high pressure airflow from the air inlet side to the air outlet side, the air barrel is provided with a flow guide end plate on the air outlet side, the flow guide end plate forms a plurality of flow guide channels, an inlet of each flow guide channel is located on an original output path of the high pressure airflow, an outlet and the inlet of each flow guide channel are located on different axes and close to the motor housing, each flow guide channel makes the high pressure airflow turn to flow toward the motor housing, the high-pressure airflow is converted into a heat-dissipating airflow which can generate heat exchange with the motor shell.

In one embodiment, the flow guiding end plate includes a base flow guiding plate and an airflow deflecting plate disposed on the base flow guiding plate, the base flow guiding plate is formed with a plurality of through holes respectively used as one of the inlets and a plurality of guiding slots disposed on a side of the base flow guiding plate facing the electric motor, the through holes are located in a projection of the airflow deflecting plate, and a portion of each guiding slot not shielded by the airflow deflecting plate forms the outlet of the guiding channel.

In one embodiment, the inlet of each of the flow-guiding channels is located at the outer side of the flow-guiding end plate.

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

In one embodiment, the motor housing is formed with a plurality of heat dissipating fins.

In one embodiment, the motor housing is composed of a hollow tube and an end cap disposed at one side of the hollow tube.

In one embodiment, the projection of each of the heat dissipation fins located at 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 transversely disposed in the hollow tube, a stator disposed at an inner edge of the hollow tube and assembled with the circuit board, and a rotor disposed in the hollow tube and assembled with the driving shaft.

In one embodiment, the baffle plate has an opening for the driving shaft to pass through, and an annular wall surrounding the opening and providing the hollow tube to be disposed thereon.

In one embodiment, the electric motor has a first bearing disposed on the end cap and coupled to the driving shaft, and the baffle plate has a second bearing disposed corresponding to the through hole and coupled to the driving shaft.

In one embodiment, each of the flow guide channels has a flow guide slope at the outlet.

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

Compared with the prior art, the invention has the following characteristics: the invention changes the air flow path of the air draft motor and simultaneously changes the structure of the electric motor, so that the air draft motor can be simultaneously used for sucking air without a large amount of moisture (namely, commonly called dry air) and humid air. More specifically, the motor housing is arranged, so that when the motor housing is used for sucking moist air, the motor housing shields and seals the inner space of the motor housing, and the moist air cannot enter the electric motor. Meanwhile, the high-pressure airflow is guided by the flow guide end plate, so that when the high-pressure airflow is discharged from the air outlet side, the high-pressure airflow is turned to be converted into the heat dissipation airflow flowing towards the motor shell, and therefore the heat dissipation airflow can dissipate heat of the electric motor when the heat dissipation airflow is discharged out of the air barrel.

Drawings

Fig. 1 is an exploded view of the first embodiment of the present invention.

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

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

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

Fig. 5 is a schematic top view of a baffle plate according to a first embodiment of the invention.

Fig. 6 is an exploded view of the second embodiment of the present invention.

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

Fig. 8 is a schematic cross-sectional view illustrating a second embodiment of the present invention.

Fig. 9 is a schematic cross-sectional view illustrating a third embodiment of the present invention.

Wherein, the reference numbers:

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A

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A

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A

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119

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A

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A

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The wind inlet side of the wind turbine

A

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The

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The

A

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144

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A

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A

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A

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61.

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Detailed Description

The present invention is described in detail and technical content with reference to the accompanying drawings, wherein:

the terms "first" and "second" used herein with respect to elements are not intended to distinguish the elements, but rather to limit the order in which the elements are sequenced. In addition, the spatially relative terms "top," "bottom," "upward," "downward," and the like may be used hereinafter with reference to the drawings, and it is to be understood that the spatially relative terms may vary with respect to the orientation depicted in the drawings.

Referring to fig. 1 to 4, the present invention provides an air extracting motor 10, which is applied to a dust collecting apparatus (not shown) for collecting an air without a large amount of moisture (i.e., dry air) or a humid air with a large amount of moisture. The suction motor 10 includes an electric motor 11 and a wind barrel 13 connected to the electric motor 11, specifically, the electric motor 11 has a motor housing 111 and a driving shaft 112, the motor housing 111 is provided for the driving shaft 112 to penetrate therethrough, and two ends of the driving shaft 112 are provided with a screw thread portion 113 for assembling the driving shaft 112. In one embodiment, the electric motor 11 includes a circuit board 114 disposed in the motor housing 111 and allowing the driving shaft 112 to pass therethrough, a rotor 115 disposed in the motor housing 111 and assembled with the driving 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 connection hole 121 of the circuit board 114, and a metal member 118 connected to the coil 117, the metal member 118 is a silicon steel sheet known to one of ordinary skill in the art. The electric motor 11 receives an operating power and is driven to rotate the driving shaft 112. In another embodiment, the motor housing 111 comprises a hollow tube 119 and an end cap 120 disposed at one side of the hollow tube 119, the hollow tube 119 is disposed in the circuit board 114, and the hollow tube 119 and the end cap 120 together shield the rotor 115 and the stator 116, such that the rotor 115 and the stator 116 cannot be observed from the top of the electric motor 11. For example, the motor housing 111 further has a notch 122 disposed in the hollow tube 119 for a portion of the circuit board 114 to protrude out of the hollow tube 119. In addition, the motor housing 111 has a first bearing 123 disposed on the end cap 120 and coupled to the driving shaft 112. In addition, the motor housing 111 may further have an opening 124 located at a side of the end cover 120 not having the first bearings 123, and the opening 124 allows the driving shaft 112 to pass through the motor housing 111.

On the other hand, the wind barrel 13 is disposed on one side of the electric motor 11 and assembled with the motor housing 111, the wind barrel 13 defines an air inlet side 131 and an air outlet side 132 facing the electric motor 11, at least one rotatable Fan blade 133(Rotating Fan) connected to the driving shaft 112 and a flow guiding end plate 134 disposed on the air outlet side 132 are disposed in the wind barrel 13, the rotatable Fan blade 133 is driven by the driving shaft 112 to rotate, and the flow guiding end plate 134 is assembled with a side of the motor housing 111 not provided with the end cap 120, so that the flow guiding end plate 134 serves as the other end cap 120 of the motor housing 111 and thereby seals the hollow tube 119. The baffle plate 134 forms a plurality of flow passages 135, for example, the flow passages 135 are spaced apart from each other and arranged in a spiral radial shape with the center of the baffle plate 134 as the origin. Each of the flow guiding channels 135 has an inlet 136 and an outlet 137, the inlet 136 and the outlet 137 are located on the same horizontal plane, and the inlet 136 and the outlet 137 of each of the flow guiding channels 135 are respectively located on different vertical axes (138, 139), more specifically, the outlet 137 is located at a position of each of the flow guiding channels 135 close to the motor housing 111, and the inlet 136 is located at an outer side of the flow guiding channel 135.

Next, referring to FIG. 2, an embodiment of the blower motor 10 of the present invention will be described. First, it is assumed that, initially, the suction motor 10 receives the operating power to drive the driving shaft 112 to start operating. At this time, since the wind barrel 13 is rotated by the rotatable fan 133 to generate a negative pressure region on the wind inlet side 131, an external airflow 60 located in the negative pressure region enters the wind barrel 13 by the negative pressure of the air. Then, the external airflow 60 is driven by the rotatable fan 133, so that the external airflow 60 centrifugally accelerates along the surface of the rotatable fan 133 toward the outer edge of the rotatable fan 133, and the external airflow 60 is pressurized by centrifugal action to be converted into a high-pressure airflow 61. The high pressure air flow 61 around the outer edge of the rotatable fan 133 impacts the inner wall of the wind barrel 13, so that the high pressure air flow 61 is deflected. Moreover, the inlet 136 of each of the guiding channels 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 surface of the wind barrel 13, and then enter the guiding channel 135. The high-pressure airflow 61 is continuously guided by the guiding passage 135 to flow toward the outlet 137, the high-pressure airflow 61 at the outlet 137 is guided by the guiding passage 135 to be turned, and the high-pressure airflow 61 is turned to be converted into a heat dissipating airflow 62. The heat radiation airflow 62 flows toward the motor housing 111 and exchanges heat with the motor housing 111.

Accordingly, the present invention allows the suction motor 10 to be used for sucking air containing a large amount of moisture (i.e., dry air) and moist air containing a large amount of moisture at the same time by changing the air flow path of the suction motor 10 and changing the structure of the electric motor 11. In more detail, the present invention, through the arrangement of the motor housing 111, when the present invention is used for sucking the humid air, the motor housing 111 shields and seals the inner space thereof, so that the humid air cannot enter the inside of the electric motor 11. Meanwhile, in the present invention, the high-pressure airflow 61 is guided by the flow-guiding end plate 134, so that when the high-pressure airflow 61 is discharged from the air-out side 132, the high-pressure airflow 61 is turned to be converted into the heat-dissipating airflow 62 flowing toward the motor housing 111, thereby allowing the heat-dissipating airflow 62 to dissipate heat of the electric motor 11 when being discharged from the air tub 13.

Referring to fig. 1 to 5 again, in an embodiment, the baffle plate 134 includes a base baffle plate 140 and an airflow diversion plate 141 disposed on the base baffle plate 140, specifically, the base baffle plate 140 is formed with a plurality of through holes 143 respectively serving as one of the inlets 136 and a plurality of baffle slots 144 disposed on a side of the base baffle plate 140 facing the electric motor 11, and the through holes 143 are located in a projection (as shown at 145 in fig. 5) of the airflow diversion plate 141. In addition, the airflow deflecting plate 141 is a ring structure, i.e. the airflow deflecting plate 141 does not completely shield the base flow guiding plate 140, and the portion of each guiding groove 144 that is not shielded by the airflow deflecting plate 141 forms the outlet 137 of the guiding channel 135. On the other hand, the portion of each flow guiding groove 144 not shielded by the airflow deflecting plate 141 determines the size of the outlet 137 of the flow guiding channel 135. If each of the guiding grooves 144 is covered by more parts, the area of the outlet 137 is reduced toward the motor housing 111, so that the heat dissipating airflow 62 is guided by the airflow deflecting plate 141 to be closer to the motor housing 111. Conversely, the heat dissipating airflow 62 is relatively far away from the motor housing 111. In another embodiment, to stably assemble the airflow diverter plate 141 and the base baffle 140, the base baffle 140 forms at least one assembling hole 146, and the airflow diverter plate 141 is provided with at least one assembling piece 147 assembled with the assembling hole 146. In addition, the base baffle 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, and the base baffle 140 can be assembled on the vacuum cleaner by the mounting hole 149.

In view of fig. 3 to 5, in one embodiment, the baffle plate 134 is for the driving shaft 112 to pass through, and the baffle plate 134 has an opening 150 for the driving shaft 112 to pass through and an annular wall 151 surrounding the opening 150 and for the hollow tube 119 to be disposed thereon. More specifically, the opening 150 is formed at the center of the baffle plate 134, the baffle plate 134 controls the position of the driving shaft 112 disposed at the opening 150, the baffle plate 134 is further provided with a second bearing 152 assembled with the driving shaft 112 in the opening 150, and the second bearing 152 is disposed to reduce friction between the driving shaft 112 and the baffle plate 134 when the driving shaft 112 rotates. In addition, the baffle plate 134 is used to reliably seal the hollow tube 119, so that the outer diameter of the annular wall 151 corresponds to the inner diameter of the hollow tube 119, and the annular wall 151 contacts the inner wall surface of the hollow tube 119 to connect and simultaneously seal the hollow tube 119, thereby preventing the moisture in the heat dissipation airflow 62 from entering the hollow tube 119.

On the other hand, referring to fig. 3 to fig. 5, in an embodiment, in order to guide the heat dissipation airflow 62 to flow toward the motor housing 111, a plurality of heat dissipation fins 125 are formed on the motor housing 111, the heat dissipation fins 125 are radially arranged with the center of the motor housing 111 as an origin, and the extending direction of each heat dissipation fin 125 is parallel to the extending direction of the hollow tube 119. The projected portion of each of the heat dissipation fins 125 is located at the outlet 137 of one of the flow guiding channels 135, so that the heat dissipation airflow 62 exhausted from the outlet 137 can flow along one of the heat dissipation fins 125 in the direction away from the outlet 137. To explain further, when the heat dissipating airflow 62 flows away from the outlet 137, the heat dissipating airflow 62 is guided by one of the heat dissipating fins 125, and the heat dissipating airflow 62 is also limited by one of the heat dissipating fins 125 adjacent to the heat dissipating fin 125, so that the heat dissipating airflow 62 can reliably flow away from the outlet 137.

In another aspect, referring to fig. 6 to 8, in another embodiment of the present invention, in order to increase the pressurization effect of the wind barrel 13, a plurality of rotatable blades 133 and at least one fixed blade (static Fan)153 located between any two adjacent rotatable blades 133 are disposed in the wind barrel 13. For example, the wind barrel 13 is provided with two rotatable blades 133 and the fixed blades 153 located between the rotatable blades 133. For convenience of description, the present invention divides the two rotatable blades 133 into a first rotatable blade 154 disposed facing the air inlet side 131 and a second rotatable blade 155 disposed facing the air outlet side 132. In addition, the fixed blade 153 has a through hole 156 for the high pressure airflow 61 to pass through, and the first rotatable blade 154 and the second rotatable blade 155 are driven by the driving shaft 112 to rotate relative to the fixed blade 153 at the same time, so that the external airflow 60 enters the wind barrel 13 from the wind inlet side 131 under the action of the first rotatable blade 154 and the second rotatable blade 155. Then, the first rotatable fan blade 154 drives the external airflow 60 to flow along the surface of the first rotatable fan blade 154, and the external airflow 60 is accelerated to flow to the outer edge of the first rotatable fan blade 154 by centrifugal effect, so that the external airflow 60 is converted into the high-pressure airflow 61 after being pressurized for the first time. Then, the fixed blade 153 directs the high pressure airflow 61 to turn from the first rotatable blade 154 and flow to the second rotatable blade 155 through the hole 156, and the second rotatable blade 155 also drives the high pressure airflow 61 to centrifugally flow along the surface thereof, thereby pressurizing the high pressure airflow 61 for a second time. Thereafter, the high-pressure airflow 61 after the secondary pressurization flows out from the air outlet side 132 and is turned to the heat dissipation airflow 62, so that the heat dissipation airflow 62 can exchange heat with the motor housing 111. Accordingly, the present invention pressurizes the high pressure airflow 61 by each of the rotatable blades 133, and when the present invention is provided with a plurality of the rotatable blades 133, the pressurization effect of the high pressure airflow 61 is accumulated. In another embodiment, the fixed blade 153 may be provided with at least one flow guiding structure 157, and the flow guiding structures 157 are arranged in a spiral radial shape with the through hole 156 as the center, thereby guiding the high pressure air flow 61 to flow toward the through hole 156.

In another aspect, referring to fig. 9, in yet another embodiment of the present invention, each of the guiding grooves 144 may be provided with a guiding inclined surface 158 at the outlet 137, and more specifically, the guiding inclined surface 158 is at a low point on the side facing the inlet 136, and the guiding inclined surface 158 is at a high point on the side facing the outlet 137. In practice, the side of the guiding inclined surface 158 facing the inlet 136 receives the high pressure air flow 61 flowing thereon, and the high pressure air flow 61 flows along the guiding inclined surface 158 toward the outlet 137, so that the high pressure air flow 61 flows toward the motor housing 111 when flowing out of the outlet 137.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An air suction motor of a dust suction device is characterized by comprising:

an electric motor having a motor housing and a drive shaft; and

an air barrel connected with the electric motor, the air barrel defining an air inlet side and an air outlet side facing the electric motor, the air barrel being provided with at least one rotatable Fan blade (Rotating Fan) connected with the drive shaft, the rotatable Fan blade being driven by the drive shaft to generate a high pressure airflow from the air inlet side to the air outlet side, the air barrel being provided with a flow guide end plate at the air outlet side, the flow guide end plate forming a plurality of flow guide channels, an inlet of each flow guide channel being located on an original output path of the high pressure airflow, an outlet of each flow guide channel and the inlet being located on different axes and being close to the motor housing, each flow guide channel diverting the high pressure airflow to flow toward the motor housing, so that the high pressure airflow is diverted into a heat dissipating airflow capable of generating heat exchange with the motor housing.

2. The suction motor of claim 1, wherein the baffle plate comprises a base baffle plate and an airflow diverter plate disposed on the base baffle plate, the base baffle plate is formed with a plurality of through holes for one of the inlets and a plurality of guiding grooves disposed on a side of the base baffle plate facing the electric motor, the through holes are disposed in a projection of the airflow diverter plate, and a portion of each guiding groove not covered by the airflow diverter plate forms the outlet of the guiding channel.

3. An extractor motor according to claim 1 or 2, wherein the inlet of each deflector channel is located on the outer side of the deflector end plate.

4. An extractor motor according to claim 1 or 2, wherein the deflector channels are arranged radially with respect to the centre of the deflector end plate.

5. The suction motor of claim 1 or 2, wherein a plurality of heat radiating fins are formed on the motor housing.

6. The suction motor of claim 5, wherein the motor housing is formed of a hollow tube and an end cap provided at one side of the hollow tube.

7. The draft motor for a vacuum cleaner, according to claim 6, wherein a projected portion of each of the heat dissipating fins located at the outer edge of the hollow tube is located at the outlet of one of the flow guide passages.

8. The suction motor of claim 7, wherein the electric motor comprises a circuit board disposed transversely inside the hollow tube, a stator disposed inside the hollow tube and connected to the circuit board, and a rotor disposed inside the hollow tube and connected to the driving shaft.

9. The suction motor of claim 8, wherein the baffle plate has an opening through which the drive shaft passes, and an annular wall surrounding the opening and providing an upper portion on which the hollow tube is disposed.

10. The suction motor of claim 9, wherein the electric motor has a first bearing disposed on the end cap and coupled to the drive shaft, and the baffle plate has a second bearing disposed corresponding to the aperture and coupled to the drive shaft.

11. The draft motor for a vacuum cleaner, according to claim 1, wherein each of the flow guide channels has a flow guide slope at the outlet.

12. The suction motor of claim 1, wherein the wind barrel has a plurality of rotatable blades and at least one Stationary blade (Stationary Fan) disposed between any two adjacent rotatable blades.