CN110899732B

CN110899732B - Power head

Info

Publication number: CN110899732B
Application number: CN201911226903.0A
Authority: CN
Inventors: 陈云法
Original assignee: Zhejiang Shuangzheng Technology Co ltd
Current assignee: Zhejiang Shuangzheng Technology Co ltd
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2021-09-17
Anticipated expiration: 2039-12-04
Also published as: CN110899732A

Abstract

The invention provides a power head, and belongs to the technical field of machinery. It has solved the poor problem of current unit head water-proof effects. This unit head of improvement structure establishes the bearing outside the main shaft including main shaft and cover, its characterized in that, the main shaft still overlaps outward and is equipped with the piece of blowing that can blow toward the unit head front side, the piece of blowing is located the bearing front side and links firmly with main shaft circumference, the main shaft still has and is located the piece front side of blowing and just right water conservancy diversion face with the piece of blowing, water conservancy diversion face outwards inclines towards the front side gradually from the main shaft axle center. The power head with the improved structure has a good waterproof effect.

Description

Power head

Technical Field

The invention belongs to the technical field of machinery, and relates to a machining part, in particular to a power head.

Background

The power head is a power component which can realize main movement and feed movement and has automatic workpiece circulation. The novel variable-speed transmission mechanism is a simple variable-speed transmission mechanism, has various forms, has the basic principle that a motor drives a gear variable-speed mechanism, can realize functions of boring, milling, drilling and the like, and can do linear motion in a small range due to the fact that some of the variable-speed transmission mechanism is provided with a guide rail. The power head is provided with a main shaft and a main shaft sleeve sleeved outside the main shaft, when the power head works, the main shaft rotates and the main shaft sleeve does not rotate, so a bearing can be arranged between the main shaft and the main shaft sleeve, the working condition of the front end of the power head is complex in the using process, some moisture and impurities easily enter from the front end of the main shaft in the rotating process of the main shaft and flow to the bearing to easily cause rusting of the bearing, and further the realization of the normal function of the bearing is influenced, namely the main shaft is easily blocked and rotates unsmoothly, so the front end of the power head needs to be subjected to waterproof design.

The existing conventional solution is to provide a plurality of cut-off grooves to cut off water to achieve water resistance, or to provide a waterproof groove and achieve water resistance by using a waterproof slope structure on the waterproof groove. For example, in the patent with application number 201711479858.0, a non-contact type liquid-proof sealing structure of a mechanical spindle is disclosed, the sealing structure comprises an end cover and a liquid-proof cover, the end cover and the liquid-proof cover are sequentially mounted on a spindle 1, the end cover comprises an inner step and an outer step, a first diversion trench is arranged on the outer periphery of the inner step, a second diversion trench is arranged on the inner periphery of the outer step, the inner step is higher than the outer step, a first intercepting trench is arranged on the inner side of the outer periphery of the liquid-proof cover, a second intercepting trench is arranged on the outer side of the inner periphery, and the first intercepting trench and the second intercepting trench are matched with the first diversion trench and the second diversion trench. The cooperation of the intercepting groove and the diversion groove can intercept and divert the cooling liquid entering the sealing structure, and can further prevent the cooling liquid from entering the main shaft, thereby ensuring the normal service life of the main shaft.

It is also currently conceivable to provide multiple seals around the spindle nose and a complex labyrinth arrangement to achieve water resistance, as shown in application No. 201822040639.9. However, the structures are complex, or the machining positions are small, the machining precision requirement is high, and the cost is high.

And the conventional method is not easy to think that the blowing piece is arranged outside the main shaft and the water blowing is realized through the blowing piece, because the space between the main shaft and the sleeve is relatively closed and narrow, water drops are easily blown up under the action of front wind force and splashed to other peripheries or opposite surfaces, so that water flows in as before, and the waterproof effect is still poor.

Disclosure of Invention

The invention aims to provide a power head aiming at the problems in the prior art, and aims to solve the problem that the existing power head is poor in waterproof effect.

The purpose of the invention can be realized by the following technical scheme:

the utility model provides a power head, includes that main shaft and cover establish the bearing outside the main shaft, its characterized in that, the main shaft still overlaps outward and is equipped with the piece of blowing that can blow toward the unit head front side, the piece of blowing is located the bearing front side and links firmly with main shaft circumference, the main shaft still has and is located the piece front side of blowing and just right water conservancy diversion face with the piece of blowing, water conservancy diversion face outwards inclines towards the front side gradually from the main shaft axle center.

Through setting up the piece of blowing in the bearing front side in this scheme, the piece of blowing is owing to link firmly with main shaft circumference, and consequently the piece of blowing can follow the main shaft and rotate together and then drive the air flow and realize blowing and the fan when the main shaft rotates, should blow and can carry out wind-force to the moisture that advances the main shaft front end fast and hinder and avoid the rivers further to main shaft rear end or even the bearing direction flow, realizes preliminary waterproof. The main shaft is also provided with a flow guide surface which is arranged opposite to the blowing piece and gradually inclines towards the front side from the outside of the axis of the main shaft, the flow guide surface is positioned at the front end of the blowing piece, and due to the existence of the flow guide surface, the blowing piece can not directly and positively act on water drops at the opposite position or the maximum wind force position to cause the water drops and the like to directly splash and flow in again, but can pull the water drops or water flow to move reversely along the inclined direction of the flow guide surface and gradually flow back to the front end direction of the main shaft to be far away from the bearing to realize drainage, and the flow guide surface can also realize outward and forward water throwing under the action of the centrifugal force of the rotation of the main shaft, thereby improving the drainage effect. In addition, because the main shaft is very big at the rotational speed of rotation in-process, the rotational speed of the piece of blowing this moment all will be much higher and because the existence wind-force of wheel face is great in comparison with ordinary fan, also can evenly spread out the drop of water and realize air-drying more easily along the water conservancy diversion face along the effect of wind power, and whole water-proof effects is good.

The conventional method is not easy to think of arranging the flow guide surface which is inclined towards the rear end of the main shaft and gradually towards the front end of the main shaft from the axis of the main shaft outwards, because the flow guide surface is just opposite to the arrangement concept of the waterproof inclined surface of the waterproof groove, the water blocking effect cannot be realized, and the conventional method is also not easy to think. The invention has better waterproof effect only by the matching design of the blowing piece and the flow guide surface, and has simple structure.

In the power head, the flow guide surface is an annular surface, the blowing part is an impeller, the distance between the outer edge of the flow guide surface and the axis of the main shaft is greater than the distance between the outer surface of the blowing part and the axis of the main shaft, and the distance between the inner edge of the flow guide surface and the axis of the main shaft is greater than or equal to the distance between the inner surface of the blowing part and the axis of the main shaft. The annular flow guide surface can enable the power head to realize effective flow guide at any position in any direction in the rotating process, liquid is prevented from flowing back again from a certain missing part, and the waterproof effect can be further improved by the structure. In addition, through the position relation of reasonable setting water conservancy diversion face and the piece of blowing in this patent, make the water conservancy diversion face whole be located the partial outside of the piece of blowing or radial relative completely and the position of non-partial inboard, make the piece of blowing can blow outside rivers and outside guide, and avoid wind-force to blow off partly water toward the inboard direction of main shaft and cause the inside drop of water still of main shaft, should set up can further keep away from the direction of the piece of blowing to the outside of water promptly keeping away from, improve water-proof effects. Of course, a fan can be used as the blowing piece, and the good blowing effect is also achieved.

In the power head, the flow guide surface is a conical surface, the main shaft is further provided with a front guide surface connected with the outer edge of the flow guide surface, the front guide surface is a conical surface, and an included angle between the front guide surface and the axis of the main shaft is smaller than an included angle between the flow guide surface and the axis of the main shaft. The angle setting of leading the face can make preceding leading the face more towards main shaft front end direction incline setting than the water conservancy diversion face, after rivers flowed to leading the face forward from the water conservancy diversion face, can be more towards the main shaft front end direction and get rid of under the effect of centrifugal force and wind power, keeps away from the impeller more, improves water-proof effects.

In the power head, the power head further comprises a sleeve which is sleeved outside the main shaft and connected with the bearing outer ring, the front end of the sleeve is fixedly connected with a bearing cover, and the bearing cover is located on the outer side of the blowing piece and is provided with a water blocking surface which is opposite to the flow guide surface. The bearing cover arranged at the front end of the bearing can realize preliminary water and dust blocking of the bearing, in addition, when the blowing piece rotates to blow and blows water flow along the flow guide surface, the water flow can flow from inside to outside along the flow guide surface, the main shaft can rotate at high speed, the water flow can be thrown outwards under the action of centrifugal force in the rotation process, if a part of water drops are thrown away from the flow guide surface, the water drops can flow or splash on the surface which is opposite to or adjacent to the flow guide surface, and the water drops are easy to splash outwards, the bearing cover is also provided with a water blocking surface which is opposite to the flow guide surface, and the bearing cover is positioned outside the blowing piece, in other words, the water blocking surface can help the blowing piece to bear the thrown or splashed water drops in advance, so that the water drops are prevented from directly splashing or flowing on the blowing piece, and avoid follow-up easier flow direction to be located the bearing of blowing a rear, guarantee that water-proof effects is good.

In the power head, the water blocking surface is an annular plane and is perpendicular to the main shaft. The annular water blocking surface can achieve a good water blocking effect from any circumferential position. And the water blocking surface is perpendicular to the main shaft, so that the water blocking surface can positively and effectively block water flow.

In the power head, the blowing part is a single-sided impeller and comprises an annular wheel body and a plurality of convex blocks protruding out of the surface of the wheel body, and the convex blocks are uniformly arranged along the circumferential direction of the wheel body. The preferred single-sided impeller that adopts in this patent uses as the piece of blowing, specifically, realizes driving the air current through the lug that outstanding in wheel body surface and realizes blowing, because the space between main shaft and the sleeve is limited, the lug occupation space is little but still can effectively realize better blowing simultaneously.

In the power head, a distance between the projection and the flow guide surface is greater than a distance between the projection and the bearing cover. The distance between the convex block and the flow guide surface is set to be larger, so that the phenomenon that enough air is not driven to flow due to narrow space is avoided, and the distance between the convex block and the bearing cover is set to be smaller, so that water flow can be prevented from flowing into a gap between the one-way impeller and the bearing cover as far as possible, and the gap between the one-way impeller and the bearing cover is reduced as far as possible on the premise of not influencing the relative rotation of the two. In addition, because the one-way impeller is fixedly connected with the main shaft, namely, the one-way impeller rotates in the circumferential direction in the use process, and the bearing cover is fixedly connected with the sleeve in the rotation process of the main shaft, relative motion can be formed between the bearing cover and the one-way impeller, a small part of wind power can be driven at the moment, namely, a small part of wind is blown at the peripheral side of the one-way impeller, the effect of preventing water flow from flowing into a gap between the one-way impeller and the one-way impeller can be also assisted, and the waterproof effect is further improved.

In foretell unit head, the main shaft is including the main part section that supplies the bearing housing to establish and the spacing section that links to each other with the main part section, the external diameter that spacing section is located main part section front side and spacing section is greater than the external diameter of main part section, the main shaft is formed with spacing step and has the spacing face towards the main shaft rear end in spacing section and main part section department of linking to each other, have the spacing notch with spacing step looks gomphosis on the piece of blowing, spacing notch has the face of leaning on that sets up with spacing face relatively, the single face impeller passes through lock nut to be fixed on the main shaft and spacing face and lean on with leaning on the face counterbalance. Through the cooperation of spacing notch and spacing step, can effectively realize blowing the location of piece and main shaft to spacing face and support to support all the time to lean on the face under lock nut's effect, support between them and can also play sealed effect, can prevent to a certain extent rivers from spacing face and support to support between the face to flow to parts such as bearing promptly to the rear of unit head, can further improve water-proof effects.

In the power head, the main shaft further comprises an expansion section connected with the limiting section, the expansion section is located on the front side of the limiting section, the outer diameter of the expansion section is larger than that of the limiting section, a flow guide step is formed at the connection position of the expansion section and the limiting section of the main shaft, and the flow guide surface is located on the flow guide step. The structure setting of expansion section, water conservancy diversion section, main part section can make the outer surface of main shaft form the tortuous path of multichannel, has increased the length of outer surface of main shaft to a certain extent, increases water-proof effects. And the water conservancy diversion face is located the great water conservancy diversion step of external diameter, can to a certain extent with the part of the inboard is kept away from more outside in rivers direction to improve water-proof effects.

In foretell unit head, the notch cuttype groove is seted up to the bearing cap front end and the face that blocks water is the groove face in notch cuttype groove, the notch cuttype groove still has the face that links to each other and the perpendicular epitaxial face that sets up with the face that blocks water, the water conservancy diversion step is located the notch cuttype inslot and is formed with palirrhea passageway between epitaxial face and the water conservancy diversion step outer peripheral face. Can make to realize blocking water still further through setting up the ladder groove to block the water face for one of them tank face in ladder groove, and block the water face again be perpendicular to main shaft setting, that is to say that the rivers that are got rid of on the water face can further throw away towards the unit head front end through with the epitaxial face of blocking water face looks vertically and walk through the backward flow, further guarantee the effect of drainage.

In foretell unit head, the expansion section is outer still to be equipped with interior waterproof cover and be located the bearing cap front side, be formed with interface channel between interior waterproof cover and the expansion section, interface channel links to each other and just to setting up with palirrhea passageway, the main shaft is outer still to be equipped with the outer waterproof cover that is located interior waterproof cover front side, be formed with the labyrinth passageway between interior waterproof cover and the outer waterproof cover, labyrinth passageway one end is linked together with interface channel, and the other end is linked together with the external world. The rivers that flow out on the follow water conservancy diversion face can be along water conservancy diversion step and further flow to the counter current passageway, and get rid of the water that blocks on the water face and also can flow to the counter current passageway along the counter current face, further hydroenergy that is located in the counter current passageway flows to between inside waterproof cover and the outer waterproof cover side by side to the external world through the labyrinth passageway, the design of labyrinth passageway can make external water directly flow into to inner from the outer end of labyrinth passageway hardly, but inside water is because still received great centrifugal force effect so can be thrown away to the external world through the labyrinth passageway to a certain extent, effectively realize the drainage.

Because the labyrinth channel can be communicated with the outside, and gaps exist between the single-face impeller and the bearing cover, namely, outside air can be communicated with the space on the peripheral side of the single-face impeller from the front side of the power head. And on the rear side of the single-sided impeller, air can enter the spindle sleeve from the motor box, and outside air can be conveyed to the peripheral space of the single-sided impeller through the bearing gap and the spacer bush gap, so that the air is supplemented in time, the situation of complete negative pressure is avoided, and the normal blowing of the single-sided impeller can be ensured all the time. In addition, in order to better blow, a special supplementary air duct can be additionally arranged at the rear side of the single-side impeller to further help better supply air so as to improve the blowing effect.

Compared with the prior art, the invention has the following technical effects:

1. set up the piece of blowing in the bearing front side, the piece of blowing is owing to link firmly with main shaft circumference, and consequently the piece of blowing can follow the main shaft and rotate together and then drive the air flow and realize blowing when the main shaft rotates, should blow and can carry out the wind-force to the moisture that advances the main shaft front end fast and hinder and avoid further to main shaft rear end or even bearing direction flow, realizes preliminary waterproof.

2. Due to the existence of the flow guide surface, the blowing piece can not directly act on water drops at the position opposite to the blowing piece or the position with the maximum wind force to cause the water drops to directly splash and flow into the blowing piece again, but can pull the water drops or water flow to move reversely along the inclined direction of the flow guide surface and gradually flow back to the front end direction of the main shaft to be far away from the bearing, so that the drainage is realized, the flow guide surface can also realize outward and forward water throwing under the action of the centrifugal force of the rotation of the main shaft, and the drainage effect is improved.

3. The main shaft is very big at the rotational speed of rotation in-process, and the rotational speed of the piece of blowing this moment all will be much higher and because the existence wind-force of wheel face is great in comparing in ordinary fan, also can evenly spread out the drop of water and realize air-drying more easily along the water conservancy diversion face along the effect of wind power, and whole water-proof effects is good.

Drawings

Fig. 1 is a schematic perspective view of a power head according to a first embodiment.

Fig. 2 is a cross-sectional view of fig. 1.

FIG. 3 is an enlarged view of the portion A of FIG. 2

Fig. 4 is an enlarged view of a portion B of fig. 3.

Fig. 5 is a schematic perspective view of a blower according to an embodiment.

Fig. 6 is a perspective view of another perspective view of the blower according to the first embodiment.

Fig. 7 is a schematic perspective view of a spindle according to a first embodiment.

FIG. 8 is an enlarged view of the portion D of FIG. 7

Fig. 9 is an enlarged view of a portion C of fig. 3.

Fig. 10 is a perspective view of the bearing cap.

In the figure, 1, main shaft; 11. a flow guide surface; 12. a front guide surface; 13. a main body section; 14. a limiting section; 15. a limiting step; 151. a limiting surface; 16. an expansion section; 17. a flow guide step; 2. a bearing; 3. a blowing member; 31. a wheel body; 311. a boss portion; 32. a bump; 33. a limiting notch; 331. an abutting surface; 4. a sleeve; 5. a bearing cap; 51. a water blocking surface; 52. a stepped groove; 521. an epitaxial surface; 53. a reflux channel; 54. a first groove; 6. locking the nut; 71. an inner waterproof cover; 72. an outer waterproof cover; 73. a labyrinth passage; 74. a connecting channel; 81. a body; 82. a dust cover; 83. a rotary drive source; 84. a feed drive source; 85. a motor box.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

The first embodiment is as follows:

as shown in fig. 1 to 3, a power head includes a body 81 for fixing on a machine tool and a sleeve 4 penetrating through the body 81, a spindle 1 is further penetrated in the sleeve 4, and a feed drive source 84 can drive the spindle 1 and the sleeve 4 to move back and forth synchronously through conversion of a screw structure and the like. And the rotation driving source 83 can rotate the main shaft 1 in the circumferential direction by rotation. The feed drive source 84 and the rotation drive source 83 are fixed to the motor case 85, and in the present embodiment, the feed drive source 84, the rotation drive source 83, the motor case 85, the spindle 1, and the sleeve 4 are all movable together in the axial direction of the spindle 1 in a synchronized forward and backward movement as a whole. The dust cover 82 is further arranged outside the power head, the dust cover 82 can play a certain dust-proof role, and the phenomenon that cutting chips or dust and the like enter the motor box 85 and enter the power head to cause blockage or clamping stagnation is avoided.

Specifically, as shown in fig. 3 and 4, the power head further includes a bearing 2 sleeved outside the main shaft 1, the main shaft 1 is further sleeved with a blowing member 3 capable of blowing air toward the front side of the power head, the blowing member 3 is located on the front side of the bearing 2 and is circumferentially and fixedly connected with the main shaft 1, the main shaft 1 is further provided with a flow guide surface 11 located on the front side of the blowing member 3 and right opposite to the blowing member 3, and the flow guide surface 11 is outwardly inclined toward the front side from the axis of the main shaft 1. Further, the flow guide surface 11 in this embodiment is an annular conical surface, and the annular flow guide surface 11 can enable the power head to realize effective flow guide at any position in any direction in the rotating process. The distance between the outer edge of the guide surface 11 and the axis of the main shaft 1 is greater than the distance between the outer surface of the blowing piece 3 and the axis of the main shaft 1, and the distance between the inner edge of the guide surface 11 and the axis of the main shaft 1 is greater than the distance between the inner surface of the blowing piece 3 and the axis of the main shaft 1, so that water can be blown to the outer side better.

In addition, the main shaft 1 is also provided with a front guide surface 12 connected with the outer edge of the guide surface 11, the front guide surface 12 is a conical surface, and the included angle between the front guide surface 12 and the axis of the main shaft 1 is smaller than the included angle between the guide surface 11 and the axis of the main shaft 1. The angle setting of leading face 12 can make leading face 12 more towards main shaft 1 front end direction skew setting than water conservancy diversion face 11 before leading, and after water flows leading face 12 from water conservancy diversion face 11, can get rid of towards main shaft 1 front end direction more under the effect of centrifugal force and wind power, keep away from the impeller more.

As shown in fig. 3 and 4, the power head further includes a sleeve 4 sleeved outside the main shaft 1 and connected to the outer ring of the bearing 2, the front end of the sleeve 4 is fixedly connected to a bearing cap 5, and the bearing cap 5 is located outside the blowing member 3 and has a water blocking surface 51 opposite to the flow guiding surface 11. The bearing cover 5 arranged at the front end of the bearing 2 can realize preliminary water and dust blocking of the bearing 2, the water blocking surface 51 can help the air blowing part 3 to bear the splashed water drops in advance, the water drops are prevented from being directly splashed or flowing onto the air blowing part 3, and the follow-up easier flowing direction of the bearing 2 behind the air blowing part 3 is prevented. In the present embodiment, the water blocking surface 51 is a plane having a ring shape, and the water blocking surface 51 is disposed perpendicular to the spindle 1.

As shown in fig. 4 to 6, the blowing member 3 of the present embodiment is a single-sided impeller and includes an annular wheel body 31 and a plurality of protrusions 32 protruding from the surface of the wheel body 31, and the protrusions 32 are uniformly arranged along the circumferential direction of the wheel body 31. Due to the limited space between the spindle 1 and the sleeve 4, the projections 32 occupy less space while still achieving a better blowing effect. And the length direction of the lug 32 is arranged along the radial direction of the impeller, so that the lug 32 has larger side area to be contacted with wind and can throw stronger wind in the rotating process. The number of the projections 32 in this embodiment is six, and a gap between two adjacent projections 32 is large enough for air to flow.

Further, the distance between the projection 32 and the flow guiding surface 11 is greater than the distance between the projection 32 and the bearing cover 5. The distance between the projection 32 and the flow guiding surface 11 is set to be large so as to prevent insufficient air from being brought to flow due to a narrow space, and the distance between the projection 32 and the bearing cap 5 is set to be small so as to prevent water from flowing into a gap between the one-way impeller and the bearing cap 5 as much as possible.

As shown in fig. 7 and 8, the main shaft 1 includes a main body section 13 for the bearing 2 to be sleeved on and a limit section 14 connected with the main body section 13, the limit section 14 is located at the front side of the main body section 13, the outer diameter of the limit section 14 is greater than that of the main body section 13, the main shaft 1 is provided with a limit step 15 at the connection position of the limit section 14 and the main body section 13, the limit step 15 is provided with a limit surface 151 facing the rear end of the main shaft 1, the blowing part 3 is provided with a limit notch 33 engaged with the limit step 15, the limit notch 33 is provided with an abutting surface 331 arranged opposite to the limit surface 151, the single-sided impeller is fixed on the main shaft 1 through the lock nut 6, and the limit surface 151 abuts against the abutting surface 331. In the embodiment, the locking nut 6 is a precision round nut. The main shaft 1 further comprises an expansion section 16 connected with the limiting section 14, the expansion section 16 is located on the front side of the limiting section 14, the outer diameter of the expansion section 16 is larger than that of the limiting section 14, a flow guide step 17 is formed at the connection position of the expansion section 16 and the limiting section 14 of the main shaft 1, and the flow guide surface 11 is located on the flow guide step 17. Further, as shown in fig. 10, in this embodiment, a stepped groove 52 is further formed at the front end of the bearing cap 5, the water blocking surface 51 is a groove surface of the stepped groove 52, the stepped groove 52 further has an extending surface 521 connected to the water blocking surface 51 and vertically disposed, the diversion step 17 is located in the stepped groove 52, and a backflow channel 53 is formed between the extending surface 521 and the outer circumferential surface of the diversion step 17. As shown in fig. 9, the expansion section 16 is further externally sleeved with an inner waterproof cover 71, the inner waterproof cover 71 is located on the front side of the bearing cover 5, a connecting channel 74 is formed between the inner waterproof cover 71 and the expansion section 16, the connecting channel 74 is connected with the reverse flow channel 53 and is just opposite to the reverse flow channel, the main shaft 1 is further externally sleeved with an outer waterproof cover 72, the outer waterproof cover 72 is located on the front side of the inner waterproof cover 71, a labyrinth channel 73 is formed between the inner waterproof cover 71 and the outer waterproof cover 72, one end 73 of the labyrinth channel is communicated with the connecting channel 74, and the other end of the labyrinth channel is communicated with the outside. The water flow flowing out of the flow guide surface 11 can flow along the flow guide steps 17 and further flow between the inner waterproof cover 71 and the outer waterproof cover 72, the outer water is difficult to directly flow into the inner end from the outer end of the labyrinth channel 73 due to the design of the labyrinth channel 73, but the water at the inner end can be thrown out to the outside to a certain extent through the labyrinth channel 73 due to the fact that the water still receives a large centrifugal force effect, and drainage is effectively achieved.

In addition, in this embodiment, another stepped groove 54 that is matched with the impeller is further formed on the bearing cover 5, specifically, a corresponding annular protrusion 311 is disposed at a position corresponding to the wheel body 31 of the impeller 3, so that a complex labyrinth structure can be formed between the impeller 3 and the bearing cover 5, and a waterproof effect is enhanced.

The working principle is as follows: in the working process of the power head, the main shaft 1 rotates at a high speed in the circumferential direction, wherein a part of cooling liquid or other impurities containing moisture are brought into and flow into the outer surface of the main shaft 1 and continuously flow into the rear end of the power head along the surface of the main shaft 1. Through setting up the piece 3 of blowing in this scheme at 2 front sides of bearing, the piece 3 of blowing is owing to link firmly with 1 circumference of main shaft, consequently the piece 3 of blowing when 1 rotations of main shaft can follow main shaft 1 and rotate together and then drive the air flow and realize blowing, should blow and can carry out the wind-force to the moisture that advances 1 front ends of main shaft fast and hinder and avoid further flowing toward 1 rear end of main shaft or even 2 directions of bearing, realizes waterproofly. The guide surface 11 is located at the front end of the blowing part 3, due to the existence of the guide surface 11, the blowing part 3 can not directly act on water drops at the right position or the maximum wind force position to directly and positively cause the water drops to directly splash and flow in again, but can pull the water drops or water flow to move reversely along the inclined direction of the guide surface 11 and gradually flow back to the front end direction of the main shaft 1 to be far away from the bearing 2, so that drainage is realized, and the guide surface 11 can also realize outward and forward water throwing under the action of the centrifugal force of the rotation of the main shaft 1. In addition, because the main shaft 1 has a very large rotating speed in the rotating process, the rotating speed of the blowing part 3 is much higher than that of a common fan and the wind force is larger due to the existence of the wheel surface, the water drops can be uniformly spread along the flow guide surface 11 along with the action of the wind force, and the air drying can be realized more easily.

Example two:

the structure and principle of this embodiment are basically the same as those of the first embodiment, and different points are as follows: in this embodiment, a double-sided blade nut may be used as the blowing part 3, and the double-sided blade nut may be directly screwed to the main shaft 1, and the position of the blowing part 3 may be conveniently adjusted by adjusting the position of the screw connection. Specifically, the blowing member 3 is also installed at the front side of the bearing 2, so that not only can blowing air forward and backward to the front side and blowing water flowing in from the front side of the power head, but also blowing air towards the bearing 2 at the rear side can further accelerate the flow of air, and even if the surrounding environment of the bearing 2 is humid or slightly moist, the blowing can be realized quickly, and a good blowing effect is also achieved.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although the terms of the main shaft 1, the flow guide surface 11, the front guide surface 12, the main body section 13, the limiting section 14, the limiting step 15, the limiting surface 151, the expanding section 16, the flow guide step 17, the bearing 2, the blowing member 3, the wheel body 31, the projection 32, the limiting recess 33, the abutting surface 331, the sleeve 4, the bearing cover 5, the water blocking surface 51, the lock nut 6, the inner waterproof cover 71, the outer waterproof cover 72, the labyrinth passage 73, the body 81, the dust cover 82, the rotary drive source 83, the feeding drive source 84, the motor case 85, and the like are used more frequently herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. A power head comprises a main shaft (1) and a bearing (2) sleeved outside the main shaft (1), and is characterized in that a blowing piece (3) capable of blowing air to the front side of the power head is further sleeved outside the main shaft (1), the blowing piece (3) is located on the front side of the bearing (2) and is circumferentially and fixedly connected with the main shaft (1), the main shaft (1) is further provided with a flow guide surface (11) located on the front side of the blowing piece (3) and right opposite to the blowing piece (3), and the flow guide surface (11) is gradually inclined towards the front side from the axis center of the main shaft (1) outwards; the main shaft (1) comprises a main body section (13) and a limiting section (14), the main body section (13) is sleeved with the bearing (2), the limiting section (14) is located on the front side of the main body section (13), the outer diameter of the limiting section (14) is larger than that of the main body section (13), a limiting step (15) is formed at the joint of the limiting section (14) and the main body section (13) of the main shaft (1), the limiting step (15) is provided with a limiting surface (151) facing the rear end of the main shaft (1), a limiting notch (33) embedded with the limiting step (15) is formed in the blowing part (3), and the limiting notch (33) is provided with an abutting surface (331) which is opposite to and abuts against the limiting surface (151).

2. The power head of claim 1, wherein the flow guiding surface (11) is an annular surface, the blowing member (3) is an impeller, the distance between the outer edge of the flow guiding surface (11) and the axis of the main shaft (1) is greater than the distance between the outer surface of the blowing member (3) and the axis of the main shaft (1), and the distance between the inner edge of the flow guiding surface (11) and the axis of the main shaft (1) is greater than or equal to the distance between the inner surface of the blowing member (3) and the axis of the main shaft (1).

3. The power head according to claim 2, further comprising a sleeve (4) sleeved outside the main shaft (1) and connected with an outer ring of the bearing (2), wherein a bearing cover (5) is fixedly connected to a front end of the sleeve (4), and the bearing cover (5) is located outside the blowing piece (3) and has a water blocking surface (51) opposite to the flow guide surface (11).

4. The power head according to claim 3, characterized in that the water blocking surface (51) is an annular plane and the water blocking surface (51) is arranged perpendicular to the spindle (1).

5. The power head according to claim 3, characterized in that the blowing member (3) is a single-sided impeller and comprises an annular wheel body (31) and a plurality of lugs (32) protruding from the surface of the wheel body (31), wherein the lugs (32) are arranged uniformly along the circumference of the wheel body (31).

6. The power head according to claim 5, characterized in that the distance between the cam (32) and the flow guiding surface (11) is larger than the distance between the cam (32) and the bearing cap (5).

7. The power head according to claim 3, characterized in that the main shaft (1) further comprises an expansion section (16) connected with the limiting section (14), the expansion section (16) is located at the front side of the limiting section (14), the outer diameter of the expansion section (16) is larger than that of the limiting section (14), a flow guiding step (17) is formed at the connection position of the expansion section (16) and the limiting section (14) of the main shaft (1), and the flow guiding surface (11) is located on the flow guiding step (17).

8. The power head according to claim 7, wherein a stepped groove (52) is formed in the front end of the bearing cover (5), the water blocking surface (51) is a groove surface of the stepped groove (52), the stepped groove (52) is further provided with an extending surface (521) which is connected with the water blocking surface (51) and is vertically arranged, the flow guide step (17) is positioned in the stepped groove (52), and a backflow channel (53) is formed between the extending surface (521) and the outer peripheral surface of the flow guide step (17).

9. The power head according to claim 8, characterized in that the expansion section (16) is further sleeved with an inner waterproof cover (71) and the inner waterproof cover (71) is located on the front side of the bearing cover (5), a connecting channel (74) is formed between the inner waterproof cover (71) and the expansion section (16), the connecting channel (74) is connected with the reverse flow channel (53) and is just opposite to the reverse flow channel, the main shaft (1) is further sleeved with an outer waterproof cover (72) located on the front side of the inner waterproof cover (71), a labyrinth channel (73) is formed between the inner waterproof cover (71) and the outer waterproof cover (72), one end of the labyrinth channel (73) is communicated with the connecting channel (74), and the other end of the labyrinth channel is communicated with the outside.