CN210255575U

CN210255575U - Sealing mechanism for angle grinder

Info

Publication number: CN210255575U
Application number: CN201920947719.4U
Authority: CN
Inventors: 吴明厅
Original assignee: Zhejiang Ken Power Tools Co ltd; Ken Holding Co ltd
Current assignee: Zhejiang Ken Power Tools Co ltd; Ken Holding Co ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-04-07
Anticipated expiration: 2029-06-21

Abstract

The utility model discloses a sealing mechanism for angle mill, a sealing mechanism for angle mill is used for the air-out end of the interior wind channel between rotor and the stator on the motor shaft to seal, a sealing mechanism for angle mill includes first bearing and seal assembly, first bearing is located between stator and the fan, just first bearing housing is located the motor shaft, seal assembly's one end connect in the stator is located the tip of air-out end, seal assembly's another pot head is located first bearing, seal assembly with first bearing encloses into a confined region, is used for blocking interior wind channel is in air-out end and outer wind channel intercommunication. The first bearing is arranged on the contact surface of the sealing assembly at the air outlet end and the motor shaft, so that friction between the sealing assembly and the motor shaft is avoided, the sealing assembly is protected, the sealing effect is improved, and the service life of the motor is further prolonged.

Description

Sealing mechanism for angle grinder

Technical Field

The utility model relates to a sealing mechanism for angle mill.

Background

The high-pressure brushless angle grinder comprises a motor and a shell, wherein the motor is arranged in the shell, an outer air duct through which air supply passes is arranged between the shell and the motor, a ventilation hole communicated with the outside is formed in the shell, the motor comprises a motor shaft, a stator and a rotor, the stator and the rotor are fixed on the motor shaft, the stator is sleeved outside the rotor, an inner air duct through which air supply passes is arranged between the stator and the rotor, and the outer air duct is communicated with the inner air duct. The motor comprises a permanent magnet, the permanent magnet is fixed on a rotor, the stator and the rotor rotate relatively, but when the angle grinder grinds metal, the generated air containing iron chips enters the motor through an inner air duct and is adsorbed by the permanent magnet on the rotor, and the motor is damaged. At present, the mode of adoption is to adopt the shield to seal the air inlet end in the interior wind channel with the motor and block, block the interior wind channel that the air that contains dust passes through air inlet end entering motor, the air-out end in the interior wind channel of motor, because of the clearance is less between fan and the stator, often locate on the motor shaft with another shield is direct cover, seal and block, because of the high-speed rotation of motor shaft, use the back often, can rub out great clearance in shield and motor shaft contact department, lead to sealed not tight, tiny dust can get into the interior wind channel of motor through this clearance, adsorb in the inside of motor, damage the stator and the rotor of motor, the life of motor has been reduced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a sealing mechanism for angle mill for overcoming the shield of air-out end among the prior art for the defect of motor shaft rotational friction.

The utility model discloses an above-mentioned technical problem is solved through following technical scheme:

the sealing mechanism for the angle grinder is used for sealing an air outlet end of an inner air duct between a rotor and a stator on a motor shaft and is characterized by comprising a first bearing and a sealing assembly, wherein the first bearing is located between the stator and a fan, the motor shaft is sleeved with the first bearing, one end of the sealing assembly is connected to the end portion, close to the fan, of the stator, the other end of the sealing assembly is sleeved with the first bearing, and the sealing assembly and the first bearing enclose a closed area for blocking the communication between the air outlet end of the inner air duct and an outer air duct.

In this scheme, set up first bearing at the air-out end, this first bearing sets up former epaxial bearing of motor between fan and stator, locate the one end of stator with seal assembly's pot head, locate first bearing with seal assembly's pot head on, avoided the motor shaft rotation to produce the clearance with seal assembly friction, it is not tight to lead to sealing mechanism to seal, make the dust in the air get into the inside damage motor of motor, sealing mechanism's sealed effect has been improved, and then the life of motor has been improved.

Seal assembly includes dust ring and shield, the shield is discoid, the center of disc is equipped with the confession the round hole that the rotor passed, a side of shield support lean on in the stator is close to the side of fan, be equipped with on the outer peripheral face of shield along the orientation the outside first turn-ups portion that extends of direction of stator, first turn-ups portion cover is located the tip of stator, the dust ring cover is located first bearing, the one end of dust ring connect in the fan, the other end of dust ring support lean on in the another side of shield, first bearing the dust ring with the shield encloses into an area, is used for blocking interior wind channel air-out end with outer wind channel intercommunication.

In this scheme, the one end of stator is located to first turn-ups portion adoption interference fit mode cover, blocks that the clearance that dusty air passes through the junction of shield and stator gets into inside the motor. The one end of dust ring supports and leans on in the side of shield, and first bearing, dust ring and shield enclose into an area, block the interior wind channel of motor at the air-out end with outer wind channel, have avoided the inside that dusty air passes through air inlet end entering motor, have improved the life of motor.

The sealing assembly further comprises a sealing ring, the sealing ring is located between the dustproof ring and the dustproof cover, the sealing ring is made of elastic materials, and two side faces of the sealing ring are respectively abutted against the side face of the dustproof cover and the side face of the dustproof ring.

In this scheme, set up the sealing ring of elasticity material between shield and dust ring, shield, sealing ring and dust ring three compress tightly through the axial, can reach better sealed effect.

The dustproof ring is close to be equipped with on the outer peripheral face of the tip of stator along the orientation the outside first bellying that extends of direction of stator, first bellying is followed motor shaft center is revolution solid structure, first bellying support lean on in a side of sealing ring.

In this scheme, set up first bellying, can reduce the contact surface of dirt ring and sealing ring, improve the packing force, firmly compress tightly the sealing ring in the side of shield, make the sealing ring of elastic material reach the sealed effect of preferred, and then block interior wind channel and outer wind channel.

The inner peripheral surface of the round hole is provided with a second flanging part which extends outwards along the direction far away from the stator, and the sealing ring is sleeved on the second flanging part.

In this scheme, locate second turn-ups portion with the sealing ring cover, second turn-ups portion is for the solid of revolution structure at motor shaft center, can fix the sealing ring, and when avoiding the angle mill operation, the sealing ring drops.

The end part, far away from the stator, of the second flanging part is provided with a clamping part which extends outwards along the radial direction of the dustproof cover, and one side face of the sealing ring abuts against the clamping part.

In this scheme, form an annular groove between buckling part and the shield, this annular groove is gone into to the sealing ring card, can further improve the fixed effect of sealing ring, avoids the sealing ring to drop.

The inner peripheral surface of the dustproof ring is provided with a second bulge portion which extends outwards along the direction of the center of the motor shaft, the second bulge portion is of a revolving body structure along the center of the motor shaft, and one side face of the second bulge portion abuts against one side face, close to the stator, of the first bearing.

In this scheme, the dust ring has certain elasticity, and a side of second bellying supports and leans on in a side of bearing, and the dust ring of being convenient for continues to apply an effort along the direction of stator, continues to compress tightly sealing ring and shield, avoids shield and sealing ring not hard up or drop to appear, makes shield and sealing ring reach the sealed effect of preferred.

The side that the dust collar is close to the fan is equipped with first annular groove, seal assembly still includes the fan, the side that the fan is close to the stator is equipped with the third bellying, the third bellying is followed motor shaft center is solid of revolution structure, third bellying block connect in first annular groove, and the block junction has the clearance of avoiding the third bellying with first annular groove mutual interference.

In this scheme, third bellying and first annular groove block are connected, are convenient for block inside dust gets into first bearing, and the clearance of rethread first bearing gets into the inside of motor, influences the life of motor. Because the fan is required to rotate relative to the dustproof ring, a gap is arranged between the third bulge and the first annular groove, so that friction is avoided when the third bulge and the first annular groove rotate relative to each other, and the smaller the gap is, the better the dustproof effect is. Through setting up third bellying and first annular groove complex labyrinth structure, can block that the dust in the air gets into first bearing, and then inside the clearance entering motor through first bearing, further improved the dustproof effect of motor at the air-out end, protected the motor, improved its life.

The side of shield is followed the circumference direction interval of disc is provided with a plurality of connecting holes, seal assembly still includes a plurality of screws, each the screw is worn to locate each the connecting hole is connected in the tip of stator.

In this scheme, pass through bolted connection with shield and stator, improve the joint strength of shield and stator, when avoiding the angle mill to use, the shield drops from the stator tip, influences sealed effect. The attachment holes and screws are not shown.

The sealing assembly is characterized in that a fourth protruding portion is arranged on the inner peripheral surface of the dustproof ring, the fourth protruding portion is in a revolving body structure along the center of the motor shaft, the sealing assembly further comprises the fan, annular steps are arranged on the outer peripheral surface of the fan, the fourth protruding portion is clamped and connected with the annular steps, and the clamping connection position is provided with a gap for avoiding mutual interference of the fourth protruding portion and the annular steps.

In this scheme, annular step and first bearing enclose into an annular groove, and the fourth bellying block is connected in annular groove, because of the fan will rotate for the dust ring, is provided with the clearance in block junction, and this clearance avoids the fan to produce the friction when rotatory for the dust ring, and this clearance is under the condition that does not produce the interference, and the effect of preventing dust is better for the clearance is littleer. Through setting up fourth bellying and annular groove complex labyrinth structure, can block that the dust in the air gets into first bearing, and then inside the clearance entering motor through first bearing, further improved the dustproof effect of motor at the air-out end, protected the motor, improved its life.

On the basis of the common knowledge in the field, the above preferred conditions can be combined at will to obtain the preferred embodiments of the present invention.

The utility model discloses an actively advance the effect and lie in: the first bearing is arranged on the contact surface of the sealing assembly at the air outlet end and the motor shaft, so that friction between the sealing assembly and the motor shaft is avoided, the sealing assembly is protected, the sealing effect is improved, and the service life of the motor is further prolonged.

Drawings

Fig. 1 is a schematic structural view of a sealing mechanism for an angle grinder according to embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a sealing mechanism for an angle grinder according to embodiment 2 of the present invention.

Description of reference numerals:

motor shaft 10

Rotor 20

Stator 30

Inner air duct 40

Outer air duct 50

Fan 60

Annular step 601

Dust cover 11

First burring 111

Second burring part 112

Latch 113

Sealing ring 12

Dust ring 13

First boss 131

Second boss 132

Third boss 133

Fourth boss 134

First annular groove 135

First bearing 14

Detailed Description

The present invention will be more clearly and completely described below by way of two embodiments and with reference to the accompanying drawings, but the present invention is not limited thereto.

Example 1

As shown in fig. 1, the embodiment discloses a sealing mechanism for an angle grinder, the sealing mechanism for an angle grinder is used for sealing an air outlet end of an inner air duct 40 between a rotor 20 and a stator 30 on a motor shaft 10, the sealing mechanism for an angle grinder includes a first bearing 14 and a sealing assembly, the first bearing 14 is located between the stator 30 and a fan 60, the first bearing 14 is sleeved on the motor shaft 10, one end of the sealing assembly is connected to an end portion of the stator 30 close to the fan 60, the other end of the sealing assembly is sleeved on the first bearing 14, and the sealing assembly and the first bearing 14 enclose a closed area for blocking the communication between the inner air duct 40 and an outer air duct 50 at the air outlet end.

In this embodiment, the angle grinder includes a motor and a housing, the motor is disposed inside the housing, an outer air duct 50 communicated with the outside is disposed between the motor and the housing, a ventilation air duct is also disposed between the stator 30 and the rotor 20 of the motor, the air duct is an inner air duct 40 of the motor, the outer air duct 50 and the inner air duct 40 are communicated with each other and communicated with the outside, and the outer air duct 50 and the inner air duct 40 have the same air inlet end and air outlet end. The end of the stator 30 close to the fan 60 is an air outlet end, and the end of the stator 30 far away from the fan 60 is an air inlet end.

Set up first bearing 14 at the air-out end, this first bearing 14 is to set up the bearing on the former motor shaft 10 between fan 60 and stator 30, locate the one end of stator 30 with seal assembly's pot head, locate first bearing 14 with seal assembly's pot head on, it produces the clearance to have avoided motor shaft 10 rotation and seal assembly friction, it is not tight to lead to seal mechanism to seal, make the inside damage motor of dust entering motor in the air, seal mechanism's sealed effect has been improved, and then the life of motor has been improved.

The sealing assembly comprises a dustproof ring 13 and a dustproof cover 11, the dustproof cover 11 is disc-shaped, a circular hole for the rotor 20 to pass through is formed in the center of a disc, one side face of the dustproof cover 11 abuts against the side face, close to the fan, of the stator 30, a first flanging portion 111 extending outwards in the direction towards the stator 30 is arranged on the outer peripheral face of the dustproof cover 11, the end portion of the stator 30 is sleeved with the first flanging portion 111, the dustproof ring 13 is sleeved with a first bearing 14, one end of the dustproof ring 13 is connected to the fan 60, the other end of the dustproof ring 13 abuts against the other side face of the dustproof cover 11, the first bearing 14, the dustproof ring 13 and the dustproof cover 11 enclose an area, and the dustproof cover 11 is used for blocking the inner air duct 40 from being communicated with the.

In this embodiment, the first flanging portion 111 is generally made of an elastic material, and is sleeved at one end of the stator 30 in an interference fit manner, so as to prevent dust-containing air from entering the motor through a gap at a connection position of the dust cover 11 and the stator 30. One end of the dustproof ring 13 is abutted against the side face of the dustproof cover 11, the first bearing 14, the dustproof ring 13 and the dustproof cover 11 are enclosed into an area, the inner air duct 40 of the motor is blocked at the air outlet end and the outer air duct 50, the dust-containing air is prevented from entering the motor through the air inlet end, and the service life of the motor is prolonged.

The sealing assembly further comprises a sealing ring 12, the sealing ring 12 is located between the dust-proof ring 13 and the dust-proof cover 11, the sealing ring 12 is made of elastic materials, and two side faces of the sealing ring 12 are respectively abutted against the side face of the dust-proof cover 11 and the side face of the dust-proof ring 13.

In this embodiment, the sealing ring 12 made of elastic material is arranged between the dust cap 11 and the dust ring 13, and the dust cap 11, the sealing ring 12 and the dust ring 13 are axially compressed, so that a good sealing effect can be achieved.

The outer peripheral surface of the dust-proof ring 13 near the end of the stator 30 is provided with a first protruding portion 131 extending outward along the direction toward the stator 30, the first protruding portion 131 is in a revolving structure along the center of the motor shaft 10, and the first protruding portion 131 abuts against one side surface of the sealing ring 12.

In this embodiment, the first protrusion 131 is provided to reduce the contact surface between the dust-proof ring 13 and the sealing ring 12, so as to increase the pressing force, and firmly press the sealing ring 12 against the side surface of the dust-proof cover 11, so that the elastic sealing ring 12 achieves a better sealing effect, and further blocks the inner air duct 40 from the outer air duct 50.

The inner peripheral surface of the circular hole in the middle of the dust cover 11 is provided with a second flanging part 112 extending outwards along the direction away from the stator 30, and the sealing ring 12 is sleeved on the second flanging part 112.

In the present embodiment, the seal ring 12 is fitted to the second burring 112, and the second burring 112 is a revolving structure with respect to the center of the motor shaft 10, and can fix the seal ring 12 to prevent the seal ring 12 from falling off during the operation of the angle grinder.

The end of the second flanging part 112 away from the stator 30 is provided with a buckling part 113 extending outwards along the radial direction of the dust cover 11, and one side surface of the sealing ring 12 abuts against the buckling part 113.

In this embodiment, an annular groove is formed between the fastening portion 113 and the dust cap 11, and the sealing ring 12 is clamped into the annular groove, so that the fixing effect of the sealing ring 12 can be further improved, and the sealing ring 12 is prevented from falling off.

The inner peripheral surface of the dust ring 13 is provided with a second protrusion 132 extending outward along the direction of the center of the motor shaft 10, the second protrusion 132 is in a revolving structure along the center of the motor shaft 10, and one side surface of the second protrusion 132 abuts against one side surface of the first bearing 14 close to the stator 30.

In this embodiment, the dust ring 13 has a certain elasticity, and a side of the second protruding portion 132 abuts against a side of the bearing, so that the dust ring 13 continuously applies an acting force in the direction of the stator 30, and continuously compresses the sealing ring 12 and the dust cap 11, thereby preventing the dust cap 11 and the sealing ring 12 from loosening or falling off, and enabling the dust cap 11 and the sealing ring 12 to achieve a better sealing effect.

The side of the dust ring 13 close to the fan 60 is provided with a first annular groove 135, the sealing assembly further includes the fan 60, the side of the fan 60 close to the stator 30 is provided with a third protruding portion 133, the third protruding portion 133 is in a revolving body structure along the center of the motor shaft 10, the third protruding portion 133 is connected to the first annular groove 135 in a clamping manner, and the clamping connection position has a gap for avoiding the mutual interference between the third protruding portion 133 and the first annular groove 135.

In this embodiment, the third protruding portion 133 and the first annular groove 135 are engaged to block dust from entering the first bearing 14 and then entering the motor through the gap of the first bearing 14, which affects the service life of the motor. Since the fan 60 is to rotate relative to the dust-proof ring 13, a gap is provided between the third protrusion 133 and the first annular groove 135 to avoid friction when the two rotate relative to each other, and the smaller the gap, the better the dust-proof effect. Through setting up third bellying 133 and the first annular groove 135 complex labyrinth structure, can block that the dust in the air gets into first bearing 14, and then gets into inside the motor through the clearance of first bearing 14, further improved the dustproof effect of motor at the air-out end, protected the motor, improved its life.

The side of the dust cap 11 is provided with a plurality of connection holes at intervals along the circumferential direction of the disk, and the sealing assembly further includes a plurality of screws, each of which is inserted into each of the connection holes and connected to the end of the stator 30.

In this embodiment, the dust cover 11 is connected with the stator 30 through the screw, so that the connection strength between the dust cover 11 and the stator 30 is improved, and the problem that the sealing effect is affected due to the fact that the dust cover 11 falls off from the end of the stator 30 when the angle grinder is used is avoided. The attachment holes and screws are not shown.

Example 2

As shown in fig. 2, the structure of the present embodiment is substantially the same as that of embodiment 1, except that: set up first bearing 14 between fan 60 and stator 30, locate the one end of stator 30 with seal assembly's pot head, locate first bearing 14 with seal assembly's other pot head, avoided motor shaft 10 rotation and seal assembly friction to produce the clearance, lead to sealing mechanism not sealed tight, make the dust in the air get into the internal damage motor of motor, improved sealing mechanism's sealed effect, and then improved the life of motor.

The inner peripheral surface of the dust ring 13 is provided with a fourth protruding portion 134, the fourth protruding portion 134 is in a revolving body structure along the center of the motor shaft 10, the sealing assembly further comprises a fan 60, an annular step 601 is arranged on the outer peripheral surface of the fan 60, the fourth protruding portion 134 is connected to the annular step 601 in a clamping mode, and a gap for avoiding mutual interference between the fourth protruding portion 134 and the annular step 601 is formed in the clamping connection position.

In the present embodiment, the annular step 601 and the first bearing 14 enclose an annular groove, the fourth protrusion 134 is engaged with the annular groove, and since the fan 60 is to rotate relative to the dust-proof ring 13, a gap is provided at the engagement portion to prevent friction from being generated when the fan 60 rotates relative to the dust-proof ring 13, and the smaller the gap is, the better the dust-proof effect is. Through setting up fourth bellying 134 and annular groove complex labyrinth structure, can block that the dust in the air gets into first bearing 14, and then gets into inside the motor through the clearance of first bearing 14, further improved the dustproof effect of motor at the air-out end, protected the motor, improved its life.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. The sealing mechanism for the angle grinder is used for sealing an air outlet end of an inner air duct between a rotor and a stator on a motor shaft and is characterized by comprising a first bearing and a sealing assembly, wherein the first bearing is located between the stator and a fan, the motor shaft is sleeved with the first bearing, one end of the sealing assembly is connected to the end portion, close to the fan, of the stator, the other end of the sealing assembly is sleeved with the first bearing, and the sealing assembly and the first bearing enclose a closed area for blocking the communication between the air outlet end of the inner air duct and an outer air duct.

2. The seal mechanism according to claim 1, wherein the seal member includes a dust ring and a dust cover, the dust cover has a disk shape, a circular hole is formed in a center of the disk for the rotor to pass through, one side of the dust cover abuts against a side of the stator close to the fan, a first flange portion extending outward in a direction toward the stator is provided on an outer circumferential surface of the dust cover, the first flange portion is fitted over an end portion of the stator, the dust ring is fitted over the first bearing, one end of the dust ring is connected to the fan, the other end of the dust ring abuts against the other side of the dust cover, and the first bearing, the dust ring and the dust cover define an area for blocking the inner duct from communicating with the outer duct at the air outlet end.

3. The seal mechanism for an angle grinder of claim 2, wherein the seal assembly further includes a seal ring positioned between the dust ring and the dust cover, the seal ring being of resilient material, the seal ring having two sides abutting against a side of the dust cover and a side of the dust ring, respectively.

4. The seal mechanism for an angle grinder of claim 3, wherein the dust ring has a first protrusion extending outward in a direction toward the stator on an outer peripheral surface of an end portion thereof close to the stator, the first protrusion having a solid of revolution structure along a center of the motor shaft, the first protrusion abutting against a side surface of the seal ring.

5. The seal mechanism for an angle grinder of claim 3, wherein a second burring part extending outward in a direction away from the stator is provided on an inner peripheral surface of the circular hole, and the seal ring is fitted around the second burring part.

6. The seal mechanism for an angle grinder of claim 5, wherein an end of the second burring part remote from the stator is provided with a catch part extending outward in a radial direction of the dust cover, and a side surface of the seal ring abuts against the catch part.

7. The seal mechanism for an angle grinder of claim 2, wherein the inner peripheral surface of the dust ring is provided with a second protrusion extending outward in the direction of the center of the motor shaft, the second protrusion is in a revolving structure along the center of the motor shaft, and one side surface of the second protrusion abuts against one side surface of the first bearing close to the stator.

8. The sealing mechanism of claim 2, wherein a first annular groove is formed on a side surface of the dust ring close to the fan, the sealing assembly further comprises the fan, a third protrusion is formed on a side surface of the fan close to the stator, the third protrusion is in a revolving structure along the center of the motor shaft, the third protrusion is connected to the first annular groove in a clamping manner, and a gap is formed at the clamping connection position to prevent the third protrusion and the first annular groove from interfering with each other.

9. The sealing mechanism for an angle grinder of any one of claims 2 to 8, wherein the side surface of the dust cap is provided with a plurality of coupling holes at intervals in the circumferential direction of the disk, and the sealing assembly further comprises a plurality of screws, each of which is inserted through each of the coupling holes and coupled to an end of the stator.

10. The seal mechanism of claim 2, wherein a fourth protrusion is disposed on an inner peripheral surface of the dust ring, the fourth protrusion is in a revolving structure along a center of the motor shaft, the seal assembly further comprises the fan, an annular step is disposed on an outer peripheral surface of the fan, the fourth protrusion is engaged with the annular step, and the engagement portion has a gap for preventing the fourth protrusion and the annular step from interfering with each other.