TWI649116B - Dust collection device for filtering dust with multiple cyclones - Google Patents

Abstract

A dust collection device for filtering dust with multiple cyclones includes a dust collection chamber, a cyclone chamber, and a diversion assembly. The dust collection chamber communicates with the cyclone chamber. The cyclone chamber has an air inlet that provides a gas to be filtered into, a ring side wall that connects the air inlet and guides the gas to be filtered to form a first cyclone. Pass the dust collection chamber and allow the first cyclone to enter the interface and an exhaust port of the dust collection chamber. The diversion assembly is disposed in the cyclone chamber. The diversion assembly has a return tube that accepts the gas to be filtered and forms a second cyclone, a guide hood separated from the return tube, and a shape formed on the return tube. A dust filtering channel between the shroud and the return pipe. The second cyclone flows toward the exhaust port, and the dust contained in the cyclone passage is allowed to enter the cyclone chamber again.

Description

Dust collection device for filtering dust with multiple cyclones

The invention relates to a dust collection device for separating dust by cyclones, in particular to a dust collection device for filtering dust by multiple cyclones.

Cyclone separation actually belongs to a kind of centrifugal sedimentation. The centrifugal force is used to rotate particles at high speed in a vortex airflow. When the rotation speed is faster, the centrifugal sedimentation speed obtained by the particles is greater, and the purpose of separating particles from the airflow is achieved. A conventional cyclone separator is shown in FIG. 1 and is mainly composed of a separation cylinder 8. The separation cylinder 8 is provided with an air inlet 81 on the wall surface, the diameter of which is tapered at the bottom, and an extraction duct 82 at the top. During the implementation, the gas containing dust particles enters through the air inlet 81, and the gas then forms a descending swirl flow along the inner wall of the separation cylinder 8. Finally, due to the suction force given by the suction pipe 82, An updraft is formed in the separation cylinder 8. The gravity of the dust prevents it from rising with the updraft, and sinks to the bottom of the separation cylinder 8 to produce a dust collection effect. The related patent technology is disclosed in TW I558462.

The dust filtering effect of the conventional cyclone separator is quite limited. If you want to increase the dust filtering effect of the cyclone separator, there are two main ways. One is to increase the volume of the chamber in the separation cylinder, and the other is to set multiple layers in the separation cylinder. Dust filter inner cylinder, such as TW I411422, TW 201340929, CN 103181741, CN 1572220A, JP 2000-254551A, JP 2005-103251A, JP 2005-224602A, JP 2006-205162A, JP 2006-272322A, JP 2006-297057A, JP 2006- 346669A, JP 2014-83478A, JP 2015-131264, US 2017/0202418, US 2018/0036746. However, if it is implemented by increasing the volume of the chamber in the separation cylinder, the overall volume of the cyclone separator will undoubtedly become huge. If the implementation of the multilayer filter inner cylinder will cause the The structure of the cyclone tends to be complicated. In addition to being unfavorable to maintenance, the regular replacement of the inner cylinder of the filter is a major problem. For example, in the implementation environment for filtering dangerous gases, once the inner tube of the filter needs to be replaced, The entire system needs to be shut down, or even stopped for a period of time, before it can be replaced. Although the technology of cyclone separation has been successfully applied to domestic vacuum cleaners in recent years, domestic vacuum cleaners only need to collect a small amount of dust particles, and the requirements for the dust filtering effect are relatively small compared to industrial requirements. Instead, cyclones with small size and simple structure can be used. If the separator is used in industrial implementation with the same structure, its dust filtering effect obviously does not meet the needs of industrial use.

In addition, the applicant of this case has also proposed a patented technology, as disclosed in EP2923625.

The main purpose of the present invention is to solve the problem that the dust collecting device implemented by a cyclone cannot filter out small dust.

To achieve the above object, the present invention provides a dust collection device for filtering dust with multiple cyclones, which includes a dust collection chamber, a cyclone chamber, and a guide assembly. The cyclone chamber is in communication with the dust collection chamber. The cyclone chamber has an air inlet that provides a gas to be filtered into, and a ring-shaped side wall that connects the gas inlet and guides the spiral flow of the gas to be filtered to form a first cyclone. An interface connecting the dust collection chamber and allowing the first cyclone to enter the dust collection chamber and an exhaust port. The diversion assembly is disposed in the cyclone chamber. The diversion assembly has a return pipe that accepts the gas to be filtered returned from the cyclone chamber and guides the spiral flow of the gas to form a second cyclone. The return pipe is located in the same axial direction and is provided with a separate shroud, and a dust filtering channel formed between the shroud and the return pipe. The shroud restricts the first cyclone from entering the return pipe from the dust filtering channel. The second cyclone flows toward the exhaust port, and the second cyclone passes through the dust filtering channel, so that the dust contained therein is thrown into the dust filtering channel, and the dust is restricted from entering the dust collection chamber by the shroud.

In one embodiment, the flow guiding assembly has a drainage tube connecting the flow guiding cover and the exhaust port.

In one embodiment, the air guide assembly has an auxiliary air guide disposed on the return pipe and forming a dust filtering channel together with the air guide.

In one embodiment, the diversion assembly has a plurality of support columns connecting the diversion cover and the return pipe.

In one embodiment, the flow guiding assembly has a drainage hood disposed on a side of the return pipe facing the interface to guide the gas to be filtered into the return pipe.

In one embodiment, the return pipe has a plurality of drainage holes arranged corresponding to the drainage hood to allow the gas to be filtered restricted by the drainage hood to enter the return pipe.

In one embodiment, the deflector assembly has a plurality of connecting ribs connecting the deflector and the auxiliary deflector.

In one embodiment, the return pipe has a connecting wall connecting the auxiliary shroud and the drainage cover.

In one embodiment, the flow guide assembly includes a plurality of support ribs connecting the return pipe and the annular sidewall. Further, each of the support ribs has a windward end and an air outlet end along the flow direction of the first cyclone, and each of the support ribs is disposed obliquely, and the windward end is higher than the air outlet end.

In one embodiment, the outer diameter of the return pipe is smaller than the inner diameter of the annular sidewall.

In one embodiment, the cyclone chamber has a first space width, and the dust collection chamber has a second space width greater than the first space width. Further, the dust collection chamber and the cyclone chamber are respectively formed by different shells.

Through the foregoing disclosure of the present invention, it has the following characteristics compared with the conventional one: The present invention generates multiple cyclones by using the guide assembly provided in the cyclone chamber, and when the cyclones are formed in the guide assembly When the recirculation tube of the component is rotated, the cyclone is restricted by the recirculation tube to increase its rotation speed, so that the cyclone can use a large centrifugal force to throw tiny dust remaining in the gas to be filtered into the dust filtering channel, and complete the second time. The filtering dust makes the gas discharged from the exhaust port more pure. Therefore, a filter provided at the exhaust port can be omitted, so that the user does not need to frequently stop the machine to replace the filter.

100‧‧‧ dust collection device

11‧‧‧ Dust collection chamber

110‧‧‧Second space width

12‧‧‧ cyclone chamber

120‧‧‧First space width

121‧‧‧air inlet

122‧‧‧ Toroidal sidewall

123‧‧‧Interface

124‧‧‧ exhaust port

125‧‧‧ Tangent

126‧‧‧ Retaining wall

127‧‧‧The first imaginary line

128‧‧‧ Second imaginary line

13‧‧‧Diversion assembly

131‧‧‧ return tube

132‧‧‧ Shroud

133‧‧‧ Dust filter channel

134‧‧‧ support column

135‧‧‧Drain tube

136‧‧‧Vent

137‧‧‧Auxiliary shroud

138‧‧‧Drain hood

139‧‧‧ lead-through hole

140‧‧‧ connecting wall

141‧‧‧ support rib

142‧‧‧windward

143‧‧‧outside

144‧‧‧Rib

15‧‧‧shell

16‧‧‧shell

200‧‧‧Exhaust device

300‧‧‧ gas to be filtered

301‧‧‧first cyclone

302‧‧‧Second Cyclone

401‧‧‧ outer diameter

402‧‧‧Inner diameter

501‧‧‧ dust

502‧‧‧ dust

601‧‧‧First Cyclone Path

602‧‧‧Second Cyclone Path

8‧‧‧ Off the tube

81‧‧‧Air inlet

82‧‧‧exhaust pipe

FIG. 1 is a schematic diagram of a conventional cyclone separator.

FIG. 2 is a schematic structural diagram of an embodiment of the present invention.

FIG. 3 is a schematic plan view of a structure according to an embodiment of the present invention.

FIG. 4 is a schematic structural diagram of another embodiment of the present invention.

FIG. 5 is a schematic implementation diagram of an embodiment of the present invention.

FIG. 6 is an enlarged schematic diagram of an implementation of a partial structure according to an embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view of a three-dimensional structure according to another embodiment of the present invention.

FIG. 8 is a schematic cross-sectional view of a three-dimensional structure according to an embodiment of the present invention.

FIG. 9 is a schematic structural diagram of another embodiment of the present invention.

FIG. 10 is a schematic structural diagram of another embodiment of the present invention.

FIG. 11 is a schematic implementation diagram of another embodiment of the present invention.

FIG. 12 is an enlarged schematic view showing the implementation of a partial structure according to an embodiment of the present invention.

FIG. 13 is a schematic structural diagram of another embodiment of the present invention.

The detailed description and technical contents of the present invention are described below with reference to the drawings. Hereinafter, the "first" and "second" terms used for the components are intended to distinguish the components and are not intended to limit the components In the order. In addition, The spatial relative terms such as “end”, “bottom edge”, “upward”, and “downward” are based on the direction of the drawing in this article. Understandably, the spatial relative terms may vary with the direction of the drawing. Changes, for example, once the figure in this figure is placed horizontally, the original "top" and "bottom edge" will change to "left" and "right", respectively.

Please refer to FIG. 2 to FIG. 6. The present invention provides a dust collection device 100 for filtering dust with multiple cyclones. The dust collection device 100 can be applied to industrial processes that require pure working gas. The dust collection device 100 includes a dust collection chamber 11, a cyclone chamber 12, and a flow guiding assembly 13. Wherein, the dust collection chamber 11 is connected to the cyclone chamber 12, the cyclone chamber 12 has a first space width 120, and the dust collection chamber 11 has a second space width greater than the first space width 120 110. Further, the first space width 120 refers to the length of the space in the cyclone chamber 12, and the second space width 110 refers to the length of the space in the dust collection chamber 11. Following this, the dust collection chamber 11 of the present invention will be significantly larger than the cyclone chamber 12, as shown in FIG. 2. Furthermore, the cyclone chamber 12 is in communication with the dust collection chamber 11 so that gas can flow between the cyclone chamber 12 and the dust collection chamber 11. In one embodiment, the cyclone chamber 12 and the dust collection chamber 11 may be formed by different shells (15, 16), that is, the cyclone chamber 12 and the dust collection chamber 11 are different from each other. The shell (15, 16), the two shells (15, 16) are assembled through a connection structure, and the connection structure may be a screw connection element or a snap connection element. According to this, the operator can separate the two casings (15, 16) according to the dust collection state of the dust collection device 100, and clean the dust collection chamber 11. Incidentally, the casing 16 forming the dust collecting chamber 11 can further be a dust collecting bucket.

The cyclone chamber 12 has an air inlet 121, a ring-shaped side wall 122 connected to the air inlet 121, an interface 123 communicating with the dust collection chamber 11, and an exhaust port 124. Wherein, the air inlet 121 is disposed on a tangent line of the annular side wall 122 (125 indicated on FIG. 3), and the air inlet 121 may be connected with a pipe assembly. In one embodiment, the air inlet 121 may be A protruding side wall 122 On the tubular structure. In addition, the air inlet 121 is disposed at an end of the cyclone chamber 12 away from the dust collection chamber 11, that is, the top of the cyclone chamber 12, and the interface 123 is disposed at the bottom edge of the cyclone chamber 12. In one embodiment, the interface 123 may be defined by the annular sidewall 122. Furthermore, the exhaust port 124 is provided at the top of the cyclone chamber 12, in one embodiment, in order to reduce the possibility that the gas entering the cyclone chamber 12 from the air inlet 121 is directly discharged from the exhaust port 124, The cyclone chamber 12 has a blocking wall 126 disposed around the exhaust port 124, and the blocking wall 126 is not connected to the flow guiding component 13. In addition, a first imaginary line 127 can be defined by the extending direction of the air inlet 121, and a second imaginary line 128 can be defined by the extending direction of the exhaust port 124. The first imaginary line 127 and the second imaginary line 128 The imaginary line 128 is not staggered when viewed from the top view of the cyclone chamber 12, and when the first imaginary line 127 extends laterally, the second imaginary line 128 extends longitudinally.

On the other hand, the diversion assembly 13 is disposed in the cyclone chamber 12. The guide assembly 13 has a return pipe 131 located in the cyclone chamber 12, a guide hood 132 located in the same axial direction as the return pipe 131 and spaced apart, and a shape formed on the guide hood 132 and the return The dust filtering channel 133 between the tubes 131. Further, the outer diameter 401 of the return pipe 131 is smaller than the inner diameter 402 of the annular side wall 122, so that there is still a space for providing cyclonic flow between the return pipe 131 and the annular side wall 122. In addition, there is an unconnected part between the shroud 132 and the return pipe 131, and this part is the dust filtering passage 133, which makes the internal space of the return pipe 131 communicate with the cyclone chamber 12 That is, the gas can enter the cyclone chamber 12 from the return pipe 131 through the dust filtering passage 133 without being pushed by an external force. In one embodiment, the guide assembly 13 has a plurality of support posts 134 connecting the guide hood 132 and the return pipe 131. Further, the support post 134 connects the end of the return pipe 131 facing the guide hood 132 and The side of the shroud 132 facing the return pipe 131, the state of the support post 134 and the actual equipment position can be appropriately adjusted according to the implementation, and will not be repeated here. Furthermore, in addition to the one disclosed in the previous embodiment, the shroud 132 may also be disclosed in another embodiment. The structure is fixed. In this embodiment, the guide assembly 13 has a guide pipe 135 connecting the guide hood 132 and the exhaust port 124. The guide pipe 135 and the return pipe 131 are located on the same axis. The tube 135 may be formed integrally with the shroud 132. Furthermore, the shroud 132 is further formed into an umbrella structure. Assuming that the position of the shroud 132 corresponding to the return pipe 131 is at the top, the bottom end of the shroud 132 will face the interface 123. The shroud 132 blocks one side of the dust filtering passage 133, so that the gas entering through the air inlet 121 cannot enter the dust filtering passage 133. In addition, the shroud 132 is a vent 136 at a position corresponding to the return pipe 131. In other words, the vent 136 is located on the same axis as the return pipe 131 and the drainage pipe 135. Furthermore, after the cyclone chamber 12 and the flow guide assembly 13 of the present invention are assembled, a first cyclone path 601 is formed along the annular side wall 122 toward the dust collection chamber 111, and a return path 131 A second cyclonic path 602 is defined, which passes through the dust filtering channel 133 and proceeds toward the exhaust port 124. In addition, the return pipe 131 in this case restricts the initial part of the second cyclone path 602, so that the cyclone formed here is compacted by the action of the return pipe 131.

Please refer to FIG. 5. When the dust collection device 100 is implemented, the air inlet 121 may be connected to a device that generates a gas to be filtered 300 through a pipe, or directly installed in a space filled with the gas to be filtered 300. On the other hand, the exhaust port 124 is connected to a ventilation device 200. After the ventilation device 200 is activated, the cyclone chamber 12 is brought into a negative pressure state, and the gas to be filtered 300 is sucked into the cyclone chamber 12 by the gas inlet 121. Inside. However, due to the design of the air inlet 121, after the gas to be filtered 300 enters the cyclone chamber 12, it will spirally flow along with the annular side wall 122 to form a first cyclone 301. The first cyclone 301 It descends along the annular side wall 122 and finally enters the dust collection chamber 11 through the interface 123. That is, the first cyclone 301 advances along the first cyclone path 601. In addition, during the downward process, the first cyclone 301 is restricted by the shroud 132 and cannot enter the return pipe 131 from the dust filtering channel 133. Moreover, due to the size of the dust collection chamber 11 Larger than the cyclone chamber 12, the rotation speed of the first cyclone 301 decreases. At the same time, the dust contained in the gas 300 to be filtered (501 shown in FIG. 5) will be caused by the first cyclone 301. The rotation speed decreases and the effect of gravity itself, and it is separated from the gas to be filtered 300 and falls into the dust collection chamber 11. In this way, the first dust filtering is completed. Furthermore, because the air extraction device 200 has not stopped working, the gas to be filtered 300 entering the dust collection chamber 11 is sucked into the return pipe 131. When the gas to be filtered 300 enters the return pipe 131, it also follows The return pipe 131 flows spirally to form the second cyclone 302. At this time, the dust collected in the dust collection chamber 11 will not be mixed into the second cyclone 302 due to its weight. Furthermore, because the diameter of the return pipe 131 is smaller than that of the dust collection chamber 11, the speed of the second cyclone 302 is significantly faster than that of the first cyclone 301, and the second cyclone 302 can be made larger. Centrifugal force. Then, the second cyclone 302 goes up along the return pipe 131, that is, when the second cyclone 302 advances along the second cyclone path 602, the second cyclone 302 passes through the dust filtering channel 133 at the moment, and the second cyclone The dust entrained in 302 (such as 502 depicted in FIG. 5 and FIG. 6) will be thrown into the dust filtering channel 133 due to the centrifugal force of the second cyclone 302, and the second dust filtering will be performed. However, the dust thrown into the dust filtering channel 133 is restricted by the shroud 132 and is mixed into the first cyclone 301 again. After that, the second cyclone 302 continues to advance toward the exhaust port 124 and leaves the dust collection device 100 from the exhaust port 124. Further, because the dust contained in the gas to be filtered 300 has different sizes, when the dust collection device 100 filters the dust for the first time, the particles with larger particles can be separated from the gas to be filtered 300, and During the secondary filtering, dust with smaller particles will be separated from the gas 300 to be filtered. In this way, in addition to obtaining a relatively pure gas, a filter provided in the exhaust port 124 can be omitted. When the filter is omitted, the user does not need to disassemble the dust collection device 100 multiple times to replace the filter, which is beneficial to use in a working environment containing dangerous gas in the gas to be filtered 300.

Please refer to FIG. 7 to FIG. 13. In one embodiment, the air guide assembly 13 has an auxiliary air guide 137 disposed on the return pipe 131 and forming a dust filtering channel 133 together with the air guide hood 132. The auxiliary shroud 137 can extend from an end edge of the return pipe 131 facing the shroud 132. The auxiliary shroud 137 and the shroud 132 have the same umbrella structure and have the same shape. Further, the auxiliary shroud 137 and the shroud 132 are respectively located on one side of the dust filtering passage 133. When the dust is thrown out by the second cyclone 302, the dust will advance toward the cyclone chamber 12 along the space between the auxiliary shroud 137 and the shroud 132, as shown in FIG. Please refer to FIG. 9 again. In another embodiment, the flow guide assembly 13 may have a plurality of connection ribs 144 connecting the flow guide hood 132 and the auxiliary flow hood 137. The connection ribs 144 are arranged at intervals. That is, there is a space between any two of the connection ribs 144 to provide gas circulation. The connecting ribs 144 support the shroud 132. In addition to separating the shroud 132 from the auxiliary shroud 137, the shroud 132 does not need to obtain support from other components. On the other hand, in order for the gas to be filtered 300 to enter the return pipe 131 more surely, the flow guide assembly 13 has a side disposed on the side of the return pipe 131 facing the interface 123 to guide the gas 300 to be filtered. The drainage cover 138 enters the return pipe 131. Further, referring to FIG. 10, the drainage hood 138 may be disposed at an end edge of the return pipe 131 facing the interface 123, and the appearance of the drainage hood 138 is similar to that of the drainage hood 132, and the drainage hood 138 is connected. The diameter of one end of the return pipe 131 is smaller than the diameter of one end of the drainage cover 138 away from the return pipe 131. Please refer to FIG. 7 to FIG. 9 again, the drainage cover 138 does not have to be disposed on an end edge of the return pipe 131 facing the interface 123, and only needs to be provided on the side of the return pipe 131 near the interface 123, and When the drainage cover 138 is assembled on the side wall of the return tube 131, the return tube 131 has a plurality of drainage holes 139 corresponding to the drainage cover 138 on the side close to the interface 123. The end of the return pipe 131 enters the gas to be filtered 300, which is restricted by the drainage cover 138, and enters the return pipe 131 through the introduction flow hole 139, as shown in FIG. 11.

Please refer to FIG. 13. In one embodiment, the return pipe 131 has a connection wall 140 connecting the auxiliary shroud 137 and the drainage cover 138. The connection wall 140 may be parallel to the pipe wall of the return pipe 131. The connecting wall 140 and the auxiliary shroud 137 together limit the movement path of the first cyclone 301 to reduce the possibility that the first cyclone 301 is abnormal. In addition, in this embodiment, the return pipe 131 may be integrally formed.

Please refer to FIG. 2 to FIG. 13 again. The flow guide assembly 13 of the present invention includes a plurality of supporting ribs 141 connecting the return pipe 131 and the annular sidewall 122. The support ribs 141 are arranged at intervals, so that any two of the support ribs 141 have an area that allows air to flow, and the support ribs 141 allow the return pipe 131 to be disposed at the center of the cyclone chamber 12. Please refer to FIG. 7. In an embodiment, each of the support ribs 141 has a windward end 142 and an air outlet end 143 along the flow direction of the first cyclone 301. Each of the support ribs 141 is inclined and the windward The end 142 is higher than the air outlet end 143. More specifically, in this embodiment, in addition to supporting the return pipe 131, each of the support ribs 141 has a function of guiding the first cyclone 301. The inclined direction of each of the support ribs 141 is along the The direction of flow of the first cyclone 301. When the first cyclone 301 touches the windward end 142, the first cyclone 301 will follow the guide of the support rib 141 and flow toward the dust collection chamber 11, and finally exit from the outlet. The wind end 143 leaves the support rib 141. Accordingly, each of the supporting ribs 141 can reduce the resistance caused to the first cyclone 301 when the present invention is implemented.

Claims (17)

A dust collection device for filtering dust with multiple cyclones, comprising: a dust collection chamber; a cyclone chamber communicating with the dust collection chamber; the cyclone chamber has an air inlet for providing a gas to be filtered into; An air inlet that guides the spiral flow of the gas to be filtered to form a ring-shaped side wall of a first cyclone, an interface that communicates with the dust collection chamber and allows the first cyclone to enter the dust collection chamber, and an exhaust port; And a diversion assembly disposed in the cyclone chamber, the diversion assembly has a return pipe that receives the gas to be filtered returned from the cyclone chamber and guides the spiral flow of the gas to form a second cyclone, A shroud located in the same axial direction as the return pipe and spaced apart, and a dust filtering channel formed between the shroud and the return pipe, the shroud restricting the first cyclone from entering the dust filtering channel A return tube, the second cyclone flows toward the exhaust port, and the second cyclone passes through the dust filtering channel, so that the contained dust is thrown into the dust filtering channel, and the dust is restricted from entering the dust collection chamber by the shroud. The dust collection device for filtering dust by multiple cyclones according to claim 1, wherein the guide assembly has a guide tube connecting the guide hood and the exhaust port. The dust collection device for filtering dust by multiple cyclones according to claim 1 or 2, wherein the deflector assembly has an auxiliary shroud disposed on the return pipe and forming a dust filtering channel together with the shroud. The dust collection device for filtering dust by multiple cyclones as described in claim 3, wherein the flow guide assembly has a drainage cover provided on a side of the return pipe facing the interface to guide the gas to be filtered into the return pipe. . The dust collection device for filtering dust by multiple cyclones as described in claim 4, wherein the return pipe has a pair of drainage holes that should be provided to the drainage cover to allow the gas to be filtered restricted by the drainage cover to enter the return tube. The dust collection device for filtering dust by multiple cyclones according to claim 3, wherein the flow guiding assembly has a plurality of connecting ribs connecting the flow guiding hood and the auxiliary flow guiding hood. The dust collection device for filtering dust by multiple cyclones according to claim 3, wherein the flow guide assembly includes a plurality of support ribs connecting the return pipe and the annular side wall. The dust collection device for filtering dust by multiple cyclones according to claim 7, wherein each of the support ribs has a windward end and an air outlet end along the flow direction of the first cyclone, and each of the support ribs is disposed obliquely. The windward end is higher than the airout end. The dust collection device for filtering dust by multiple cyclones according to claim 1, wherein the guide assembly has a plurality of support columns connecting the guide hood and the return pipe. The dust collection device for filtering dust by multiple cyclones as described in claim 1 or 9, wherein the flow guide assembly has a side provided on the side of the return pipe facing the interface to guide the gas to be filtered into the return pipe. Drain hood. The dust collection device for filtering dust by multiple cyclones according to claim 10, wherein the return pipe has a plurality of drainage holes corresponding to the drainage hood to allow the gas to be filtered restricted by the drainage hood to enter the drainage pipe. The dust collection device for filtering dust by multiple cyclones according to claim 10, wherein the deflector assembly has an auxiliary shroud disposed on the return pipe and forming a dust filtering channel together with the shroud, and the return pipe has A connecting wall connecting the auxiliary shroud and the shroud. The dust collection device for filtering dust by multiple cyclones according to claim 1, wherein the flow guide assembly includes a plurality of support ribs connecting the return pipe and the annular side wall. The dust collection device for filtering dust by multiple cyclones according to claim 13, wherein each of the support ribs has a windward end and an air outlet end along the flow direction of the first cyclone, and each of the support ribs is disposed obliquely, the The windward end is higher than the airout end. The dust collection device for filtering dust by multiple cyclones according to claim 1, wherein the outer diameter of the return pipe is smaller than the inner diameter of the annular sidewall. The dust collection device for filtering dust by multiple cyclones according to claim 1 or 13 or 14 or 15, wherein the cyclone chamber has a first space width, and the dust collection chamber has a second space larger than the first space width. Space width. The dust collection device for filtering dust by multiple cyclones according to claim 16, wherein the dust collection chamber and the cyclone chamber are respectively formed by different shells.