CN213081713U - Chain saw and garden instrument - Google Patents

Abstract

The utility model discloses a chain saw and a garden tool, which comprises a casing, a motor, a fan and a first centrifugal fluid director, wherein the casing comprises an air outlet; the first centrifugal flow guider is arranged at the air inlet of the shell or integrally formed with the shell to form the air inlet, the first centrifugal flow guider comprises a first flow guide disc and a first housing, the first flow guide disc comprises a plurality of first flow guide blades arranged at intervals along the circumferential direction, the first flow guide blades spirally extend along the axial direction of the first flow guide disc, the first flow guide blades are provided with a first air inlet side and a first air outlet side, a first flow guide cavity is formed in the middle of the first flow guide disc, and the first air outlet side is communicated with the first flow guide cavity; the first housing is arranged on the first air outlet side, and a first chip removal port is formed in the outer peripheral surface of the first housing. The first centrifugal flow guider is used for discharging the debris in the air flow, so that the debris entering the inner part of the shell is reduced, and the stability and the reliability are ensured.

Description

Chain saw and garden instrument

Technical Field

The utility model relates to a chain saw and garden instrument.

Background

Certain types of work pieces, such as wood, produce wood chips during the work using garden tools, such as chain saws. For a chain saw, the chain saw generally comprises a machine shell, a chain and a motor arranged in the machine shell, wherein the motor is used for driving the chain to move, a heat dissipation fan is arranged on an output shaft of the motor, an air inlet and an air outlet are formed in the machine shell, and when the heat dissipation fan rotates, air enters from the air inlet and is discharged from the air outlet to take away heat in the machine shell.

Due to the negative pressure effect at the air inlet, sawdust generated in the working process of the chain saw can be sucked, the heat dissipation and the performance of parts in the shell are affected, the failure rate of the chain saw is increased, and the reliability of the chain saw is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can reduce the fault rate and increase chain saw and garden instrument of reliability.

As the conception, the utility model adopts the technical proposal that:

a chain saw, comprising:

the shell comprises an air inlet and an air outlet;

a motor disposed within the enclosure, the motor including a housing;

the fan is arranged on the output shaft of the motor and is positioned in the shell;

first centrifugal divertor, fixed set up in air inlet department, first centrifugal divertor includes:

the first guide disc comprises a plurality of first guide vanes which are arranged at intervals in the circumferential direction, the first guide vanes spirally extend along the axial direction of the first guide disc, the first guide disc is provided with a first air inlet side and a first air outlet side, a first guide cavity is formed in the middle of the first guide disc, the first air outlet side is communicated with the first guide cavity, and the first guide cavity is communicated with the air inlet;

the first housing is arranged on the first air outlet side, and a first chip removal port is formed in the outer peripheral surface of the first housing.

Wherein, first guiding diaphragm includes: the first inner disc and the first outer disc are concentrically arranged, the first guide cavity is formed in the middle of the first inner disc, and the first guide vanes are arranged between the first inner disc and the first outer disc.

Wherein the first centrifugal deflector further comprises:

the air guide disc is arranged on the first air inlet side, a plurality of air guide blades are arranged on the air guide disc at intervals in the circumferential direction, the air guide blades extend along the radial direction of the air guide disc, and the air guide blades are opposite to the air inlet ends of the first guide blades.

The middle part of the air guide disc forms a cavity which is communicated with the first flow guide cavity and the air inlet.

The air inlet is located on the side of the casing, or the air inlet is located on the rear of the casing, or the air inlet is located inside a battery compartment of the casing.

Wherein, the motor includes inlet end and the end of giving vent to anger, still including setting up the second centrifugation divertor of inlet end, the second centrifugation divertor with the fan is located respectively the both ends of output shaft, the second centrifugation divertor includes:

the second guide disc comprises a plurality of second guide vanes which are arranged at intervals in the circumferential direction, the second guide vanes spirally extend along the axial direction of the second guide disc, the second guide disc is provided with a second air inlet side and a second air outlet side, a second guide cavity is formed in the middle of the second guide disc, the second air outlet side is communicated with the second guide cavity, and the second guide cavity is communicated with the air inlet end;

the second housing is arranged on the second air outlet side, a second chip removal port is formed in the outer peripheral face of the second housing, and the second flow deflector and the second housing are provided with avoiding holes used for penetrating through the output shaft.

The second flow guide disc comprises a second inner disc, a middle disc and a second outer disc which are concentrically arranged, the avoidance hole is formed in the middle of the second inner disc, the second flow guide cavity is located between the second inner disc and the middle disc, and the second flow guide blades are arranged between the middle disc and the second outer disc.

And a baffle is arranged on the outer peripheral surface of the second flow guide disc at one side of the second chip removal port.

A garden tool, comprising:

a housing including an air outlet;

the motor is arranged in the shell;

the fan is arranged on an output shaft of the motor;

first centrifugal divertor, with casing integrated into one piece and constitute with air outlet complex air intake, first centrifugal divertor includes:

the first diversion disc comprises a plurality of first diversion blades arranged at intervals in the circumferential direction, the first diversion blades spirally extend along the axial direction of the first diversion disc, the first diversion disc is provided with a first air inlet side and a first air outlet side, a first diversion cavity is formed in the middle of the first diversion disc, the first air outlet side is communicated with the first diversion cavity, and the first diversion cavity is communicated with the air outlet;

the first housing is arranged on the first air outlet side, and a first chip removal port is formed in the outer peripheral surface of the first housing.

Wherein, the motor includes inlet end and the end of giving vent to anger, still including setting up the second centrifugation divertor of inlet end, the second centrifugation divertor with the fan is located respectively the both ends of output shaft, the second centrifugation divertor includes:

the second guide disc comprises a plurality of second guide vanes which are arranged at intervals in the circumferential direction, the second guide vanes spirally extend along the axial direction of the second guide disc, the second guide disc is provided with a second air inlet side and a second air outlet side, a second guide cavity is formed in the middle of the second guide disc, the second air outlet side is communicated with the second guide cavity, and the second guide cavity is communicated with the air inlet end;

the second housing is arranged on the second air outlet side, a second chip removal port is formed in the outer peripheral face of the second housing, and the second flow deflector and the second housing are provided with avoiding holes used for penetrating through the output shaft.

The utility model has the advantages that:

the utility model provides a chain saw, when the motor during operation, drive the fan and rotate, make the casing inside form the negative pressure, the air current gets into first centrifugation divertor under the effect of suction, get into between a plurality of first guide vane from first air inlet side, because first guide vane extends along the axial spiral of first guide vane, make the air current flow along first guide vane form the swirl, under the guide of first guide vane, the piece that carries in the air current is discharged from first chip removal mouth under the effect of centrifugal force, the air current gets into first guide chamber from first air-out side after first guide vane, and then get into the air intake; due to the arrangement of the first centrifugal fluid director, debris in the airflow is discharged, the debris entering the interior of the shell is reduced, the stability and the reliability of the performance of the chain saw are ensured, and the failure rate is reduced.

The utility model provides a garden tool, when the motor during operation, drive the fan and rotate, make the casing inside form the negative pressure, the air current gets into first centrifugal divertor under the effect of suction, get into between a plurality of first guide vane from first air inlet side, because first guide vane extends along the axial spiral of first deflector, make the air current flow along first guide vane form the swirl, under the guide of first guide vane, the piece that carries in the air current is discharged from first chip removal mouth under the effect of centrifugal force, the air current gets into first guide chamber from first air-out side after first guide vane, and then get into the air outlet; due to the arrangement of the first centrifugal fluid director, debris in the airflow is discharged, the debris entering the interior of the shell is reduced, the stability and the reliability of the performance of the chain saw are ensured, and the failure rate is reduced. Because the first centrifugal flow guider and the machine shell are integrally formed and form the air inlet matched with the air outlet, the number of parts is reduced, and structures such as independently arranging an opening or arranging a shutter on the machine shell are omitted.

Drawings

FIG. 1 is a schematic structural view of a chain saw according to an embodiment of the present invention;

fig. 2 is an exploded schematic view of a chain saw according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a first centrifugal flow guider according to a first embodiment of the present invention;

FIG. 4 is an angular exploded view of the first centrifugal deflector provided in FIG. 3;

fig. 5 is a schematic structural view of the first diaphragm of fig. 4;

FIG. 6 is a schematic view of another angular exploded configuration of the first centrifugal deflector as provided in FIG. 3;

fig. 7 is a partial cross-sectional view of a first centrifugal deflector according to an embodiment of the present invention;

fig. 8 is a schematic view of a part of the structure of a motor of a chain saw according to a second embodiment of the present invention;

FIG. 9 is an angled exploded view of the chain saw provided in FIG. 8;

fig. 10 is a schematic structural view of the second diaphragm of fig. 9;

FIG. 11 is a schematic view of another angled exploded view of the chain saw provided in FIG. 8.

In the figure:

10. a housing; 101. an air inlet; 102. a handle;

20. a motor; 201. an output shaft;

31. a chain; 32. a guide plate;

40. a fan;

50. a first centrifugal flow director;

51. a first flow guiding disc; 511. a first guide vane; 512. a first flow guide cavity; 513. a first inner disc; 514. a first outer disc;

52. a first housing; 521. a first chip removal port;

53. a wind guide plate; 531. wind guide blades; 532. a cavity;

60. a second centrifugal flow director;

61. a second flow guiding disc; 611. a second guide vane; 612. a second diversion cavity; 613. a second inner disc; 614. a second outer disc; 615. avoiding holes; 616. an intermediate tray; 617. a baffle plate;

62. a second housing; 621. a second chip removal port.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

Example one

Referring to fig. 1 and 2, an embodiment of the present invention provides a garden tool, such as a chainsaw, including a housing 10, a motor 20 (see fig. 8, the motor 20 is hidden by the housing 10 in fig. 1 and 2) disposed in the housing 10, and a chain assembly connected to the housing 10, the chain assembly including a chain 31 and a guide plate 32 for guiding the support chain 31, the motor 20 being used for driving the chain 31. The chainsaw further comprises a battery pack for powering the motor 20, the battery pack being detachably connected to the housing 10. The housing 10 is formed with a handle 102 for a user to hold. The chainsaw also includes a trigger for controlling the start and stop of the motor 20, which is disposed on the handle 102.

In the embodiment, the casing 10 has an air inlet 101 and an air outlet, and the air flow enters the inside of the casing 10 from the outside of the casing 10 through the air inlet 101, enters the motor 20, and then is discharged from the air outlet. The motor 20 comprises a shell, and an air inlet end and an air outlet end are arranged on the shell; the chainsaw further includes a fan 40, the fan 40 is disposed on the output shaft 201 of the motor 20 and within the housing, and the fan 40 generates a suction force for airflow to flow for heat dissipation.

The chain saw further comprises a first centrifugal flow guider 50, the first centrifugal flow guider 50 is fixedly arranged at the air inlet 101, when the motor 20 works, the fan 40 is driven to rotate, negative pressure is formed inside the machine shell 10, air flow enters the first centrifugal flow guider 50 under the action of suction force, and debris and air in the air flow are separated under the action of centrifugation.

Referring to fig. 3 to 7, the first centrifugal flow director 50 includes a first flow guide disc 51 and a first housing 52, the first flow guide disc 51 includes a plurality of first flow guide vanes 511 arranged at intervals around the circumferential direction, the first flow guide vanes 511 extend spirally along the axial direction of the first flow guide disc 51, the first flow guide disc 51 has a first air inlet side and a first air outlet side, a first flow guide cavity 512 is formed in the middle of the first flow guide disc 51, the first air outlet side is communicated with the first flow guide cavity 512, and the first flow guide cavity 512 is communicated with the first air inlet 101; the first housing 52 is disposed at the first air outlet side, and a first exhaust port 521 is disposed on the outer peripheral surface of the first housing 52.

The airflow enters between the first guide vanes 511 from the first air inlet side under the action of the suction force in the casing 10, the first guide vanes 511 extend spirally along the axial direction of the first guide disc 51, so that the airflow flows along the first guide vanes 511 to form a vortex, under the guide of the first guide vanes 511, the chips carried in the airflow are discharged from the first chip discharge port 521 under the action of centrifugal force, and after passing through the first guide vanes 511, the airflow enters the first guide cavity 512 from the first air outlet side and further enters the first air inlet 101; due to the arrangement of the first centrifugal flow guider 50, the scraps in the air flow are discharged, the scraps entering the inner part of the machine shell 10 are reduced, the stability and the reliability of the performance of the chain saw are ensured, and the failure rate is reduced.

The air inlet 101 of the casing 10 may be disposed at a side portion of the casing 10, may be disposed at a rear portion of the casing 10, and may also be disposed inside a battery compartment of the casing 10, and the first centrifugal flow director 50 may be disposed at the air inlet 101 without limiting the disposition position and number of the air inlet 101.

The first baffle disc 51 in this embodiment includes a first inner disc 513 and a first outer disc 514, which are concentrically arranged, the first baffle chamber 512 is opened in the middle of the first inner disc 513, and the first baffle blades 511 are arranged between the first inner disc 513 and the first outer disc 514. The first outer disc 514 is fixedly attached to the first housing 52.

The airflow flows along the first guide vane 511 to form a vortex, and the first exhaust port 521 of the first housing 52 is opened along the flowing direction of the airflow, so that the chips in the airflow can flow towards the first exhaust port 521 under the action of centrifugal force.

The first centrifugal flow guider 50 further comprises a wind guide disc 53, the wind guide disc 53 is arranged on the first wind inlet side of the first flow guide disc 51, a plurality of wind guide blades 531 are circumferentially arranged on the wind guide disc 53 at intervals, and the wind guide blades 531 extend along the radial direction of the wind guide disc 53. The air guide blade 531 guides an external air flow into the baffle 51, so that the air flow uniformly enters and the ventilation area is increased.

The middle part of the air guide disc 53 forms a cavity 532, the cavity 532 communicates with the first diversion cavity 512 and the air inlet 101, and the air flow in the first diversion cavity 512 can enter the air inlet 101 through the cavity 532.

The air guide vanes 531 are opposite to the air inlet ends of the first guide vanes 511, external air flow enters from the space between the adjacent air guide vanes 531 and flows to the space between the adjacent first guide vanes 511, the first guide vanes 511 extend spirally along the axial direction of the first guide disc 51, so that the air flow flows along the first guide vanes 511 to form a vortex, under the guide of the first guide vanes 511, chips carried in the air flow are discharged from the first chip discharge port 521 under the action of centrifugal force, and the air flow enters the first guide cavity 512 from the first air outlet side after passing through the first guide vanes 511 and then enters the air inlet 101. The arrows in fig. 7 show the flow direction of the airflow.

As a replaceable embodiment, the casing 10 may not be separately provided with an air inlet, but only the first centrifugal flow director 50 is provided, the first centrifugal flow director 50 and the casing 10 are integrally formed to form an air inlet matching with the air outlet, that is, the first air guiding disc 53 and the casing 10 are integrally formed, and the body of the first centrifugal flow director 50 can be directly regarded as the air inlet, at this time, the air flow enters between the first guiding vanes 511 from the first air inlet side of the first centrifugal flow director 50, discharges the chips in the air flow from the first chip outlet 521 under the centrifugal action of the first guiding vanes 511, and finally enters the inside of the casing 10 through the first guiding chamber 512. Through the arrangement, the number of parts is reduced, and the structure that an opening is independently arranged or a shutter is arranged at the air inlet of the shell 10 is omitted.

Example two

Fig. 8 to 11 show a second embodiment, wherein the same or corresponding parts as the first embodiment are provided with the same reference numerals as the first embodiment. For the sake of simplicity, only the differences between the second embodiment and the first embodiment will be described. The difference is that the air inlet end of the motor 20 is provided with a second centrifugal fluid director 60, the second centrifugal fluid director 60 and the fan are respectively located at two ends of the output shaft 201, the air flow entering the interior of the casing 10 is discharged from the air outlet end through the second centrifugal fluid director 60 from the air inlet end under the action of the fan 40, and the second centrifugal fluid director 60 can centrifuge the air flow entering the interior of the casing 10, so that the debris in the air flow is separated from the air.

The second centrifugal flow guider 60 comprises a second flow guiding disc 61 and a second cover 62, the second flow guiding disc 61 comprises a plurality of second flow guiding blades 611 arranged at intervals in the circumferential direction, the second flow guiding blades 611 spirally extend along the axial direction of the second flow guiding disc 61, the second flow guiding blades 611 are provided with a second air inlet side and a second air outlet side, a second flow guiding cavity 612 is formed on the second flow guiding disc 61, the second air outlet side is communicated with the second flow guiding cavity 612, and the second flow guiding cavity 612 is communicated with the air inlet end; the second housing 62 is disposed at the second air outlet side, a second chip removal port 621 is disposed on the outer circumferential surface of the second housing 62, and the second deflector 61 and the second housing 62 are disposed with a avoiding hole 615 for the output shaft 201.

The air flow enters the housing of the motor 20 from the air inlet end under the action of the suction force of the fan 40, enters between the plurality of second guide vanes 611, and flows along the second guide vanes 611 to form a vortex due to the spiral extension of the second guide vanes 611 along the axial direction of the second guide disc 61, and under the guide of the second guide vanes 611, the chips carried in the air flow are discharged from the chip discharge port under the action of the centrifugal force, and the air flow enters the second guide cavity 612 from the air outlet side after passing through the second guide vanes 611, and then enters the air inlet end; due to the arrangement of the second centrifugal flow guider 60, the scraps in the air flow are discharged, the scraps entering the inner part of the shell of the motor 20 are reduced, the performance stability and reliability of the motor 20 are ensured, and the failure rate is reduced.

The second centrifugal fluid director 60 and the fan 40 are respectively located at two ends of the output shaft 201, and make full use of the suction force of the fan 40, so that air enters one end of the output shaft 201 and exits at the other end, and further the heat inside the motor 20 is taken away. The second deflector 61 and the second housing 62 are provided with an avoiding hole 615 for penetrating the output shaft 201, and the output shaft 201 rotates, while the second deflector 61 and the second housing 62 are fixed, so that the avoiding hole 615 is arranged to avoid interference.

The second baffle plate 61 in this embodiment includes a second inner plate 613, a middle plate 616 and a second outer plate 614 which are concentrically arranged, the avoidance hole 615 is opened in the middle of the second inner plate 613, the second baffle chamber 612 is located between the second inner plate 613 and the middle plate 616, and the second baffle blade 611 is arranged between the middle plate 616 and the second outer plate 614.

The air flow flows along the second guide vane 611 to form a vortex, and the second chip exhaust port 621 of the second housing 62 is opened along the flow direction of the air flow, so that the chips in the air flow can flow towards the second chip exhaust port 621 under the action of centrifugal force.

In this embodiment, the outer peripheral surface of the second outer disc 614 of the second deflector 61 is flush with the outer peripheral surface of the second housing 62, so that a baffle 617 is provided on the outer peripheral surface of the second deflector 61 on the side of the second exhaust port 621 to prevent the chips in the second exhaust port 621 from being exposed to the housing of the motor 20. The chips flowing out of the second chip discharge port 621 can be discharged to the outside of the housing 10 through the chip discharge passage, and will not be described in detail herein.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A chain saw, comprising:

the shell comprises an air inlet and an air outlet;

a motor disposed within the enclosure, the motor including a housing;

the fan is arranged on the output shaft of the motor and is positioned in the shell;

the method is characterized in that: still include first centrifugal divertor, fixed set up in air inlet department, first centrifugal divertor includes:

the first guide disc comprises a plurality of first guide vanes which are arranged at intervals in the circumferential direction, the first guide vanes spirally extend along the axial direction of the first guide disc, the first guide disc is provided with a first air inlet side and a first air outlet side, a first guide cavity is formed in the middle of the first guide disc, the first air outlet side is communicated with the first guide cavity, and the first guide cavity is communicated with the air inlet;

the first housing is arranged on the first air outlet side, and a first chip removal port is formed in the outer peripheral surface of the first housing.

2. The chain saw as recited in claim 1, wherein:

the first flow deflector comprises: the first inner disc and the first outer disc are concentrically arranged, the first guide cavity is formed in the middle of the first inner disc, and the first guide vanes are arranged between the first inner disc and the first outer disc.

3. The chain saw as recited in claim 2, wherein:

the first centrifugal deflector further comprises:

the air guide disc is arranged on the first air inlet side, a plurality of air guide blades are arranged on the air guide disc at intervals in the circumferential direction, the air guide blades extend along the radial direction of the air guide disc, and the air guide blades are opposite to the air inlet ends of the first guide blades.

4. The chain saw as recited in claim 3, wherein:

the middle part of the air guide disc forms a cavity which is communicated with the first flow guide cavity and the air inlet.

5. The chain saw as recited in claim 1, wherein:

the air inlet is located on the side of the casing, or the air inlet is located on the rear of the casing, or the air inlet is located inside a battery compartment of the casing.

6. The chain saw as recited in claim 1, wherein:

the motor includes inlet end and the end of giving vent to anger, still including setting up the second centrifugation divertor of inlet end, the second centrifugation divertor with the fan is located respectively the both ends of output shaft, the second centrifugation divertor includes:

the second guide disc comprises a plurality of second guide vanes which are arranged at intervals in the circumferential direction, the second guide vanes spirally extend along the axial direction of the second guide disc, the second guide disc is provided with a second air inlet side and a second air outlet side, a second guide cavity is formed in the middle of the second guide disc, the second air outlet side is communicated with the second guide cavity, and the second guide cavity is communicated with the air inlet end;

the second housing is arranged on the second air outlet side, a second chip removal port is formed in the outer peripheral face of the second housing, and the second flow deflector and the second housing are provided with avoiding holes used for penetrating through the output shaft.

7. The chain saw as recited in claim 6, wherein:

the second flow guide disc comprises a second inner disc, a middle disc and a second outer disc which are concentrically arranged, the avoidance hole is formed in the middle of the second inner disc, the second flow guide cavity is located between the second inner disc and the middle disc, and the second flow guide blades are arranged between the middle disc and the second outer disc.

8. The chain saw as recited in claim 7, wherein:

and a baffle is arranged on the outer peripheral surface of the second flow guide disc and on one side of the second chip removal port.

9. A garden tool, comprising:

a housing including an air outlet;

the motor is arranged in the shell;

the fan is arranged on an output shaft of the motor;

the method is characterized in that: still include first centrifugation divertor, with casing integrated into one piece and constitute with air outlet complex air intake, first centrifugation divertor includes:

the first diversion disc comprises a plurality of first diversion blades arranged at intervals in the circumferential direction, the first diversion blades spirally extend along the axial direction of the first diversion disc, the first diversion disc is provided with a first air inlet side and a first air outlet side, a first diversion cavity is formed in the middle of the first diversion disc, the first air outlet side is communicated with the first diversion cavity, and the first diversion cavity is communicated with the air outlet;

the first housing is arranged on the first air outlet side, and a first chip removal port is formed in the outer peripheral surface of the first housing.

10. The gardening tool according to claim 9, wherein:

the motor includes inlet end and the end of giving vent to anger, still including setting up the second centrifugation divertor of inlet end, the second centrifugation divertor with the fan is located respectively the both ends of output shaft, the second centrifugation divertor includes:

the second guide disc comprises a plurality of second guide vanes which are arranged at intervals in the circumferential direction, the second guide vanes spirally extend along the axial direction of the second guide disc, the second guide disc is provided with a second air inlet side and a second air outlet side, a second guide cavity is formed in the middle of the second guide disc, the second air outlet side is communicated with the second guide cavity, and the second guide cavity is communicated with the air inlet end;

the second housing is arranged on the second air outlet side, a second chip removal port is formed in the outer peripheral face of the second housing, and the second flow deflector and the second housing are provided with avoiding holes used for penetrating through the output shaft.

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