WO2022041487A1

WO2022041487A1 - Explosion-proof structure of drum motor

Info

Publication number: WO2022041487A1
Application number: PCT/CN2020/127652
Authority: WO
Inventors: 张春晖
Original assignee: 江苏嘉轩智能工业科技股份有限公司
Priority date: 2020-08-24
Filing date: 2020-11-10
Publication date: 2022-03-03
Also published as: CN111711306B; CN111711306A

Abstract

An explosion-proof structure of a drum motor, the structure comprising a rotating shaft (1), a rolling bearing (2), an end cover (3), a shaft sleeve (4), a bearing cover (5), and an elastic member (6). The rolling bearing (2) is mounted between the end cover (3) and the rotating shaft (1). A mounting recess (7) is formed between the bearing cover (5) and the shaft sleeve (4), and the mounting recess (7) faces away from the rolling bearing (2). The elastic member (6) supports the bearing cover (5) and the shaft sleeve (4) to be embedded in the mounting recess (7). In the radial direction, a first gap is provided between the bearing cover (5) and the shaft sleeve (4). The shaft sleeve (4) is in clearance fit with the rotating shaft (1). The explosion-proof structure of the drum motor can guarantee the service life and maintain a high working efficiency when working for a long time. Moreover, the entire structure of the explosion-proof structure is simple, but said structure is safe and reliable to use.

Description

Flameproof structure of drum motor

technical field

The invention relates to the technical field of explosion-proof motors, in particular to an explosion-proof structure of a drum motor.

Background technique

The existing explosion-proof structure of the drum is basically an integral type, and there is a gap of about 0.35 mm between the inner hole of the bearing cover and the rotating shaft. Since the drum is subjected to a large radial belt pull, the bearing cover will be radially eccentric. The inventor found that if the bearing is worn, the radial eccentricity of the bearing cover will be too large, and even contact and friction with the rotating shaft, the friction will damage the bearing cover, the explosion-proof gap will increase, and the explosion will be lost.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above technical problems and provide a flameproof structure for a drum motor.

In order to achieve the above object, the present invention provides an explosion-proof structure of a drum motor, which includes a rotating shaft, a rolling bearing, an end cover, a shaft sleeve, a bearing cover and an elastic member, and the rolling bearing is installed between the end cover and the rotating shaft;

An installation groove is formed between the bearing cover and the shaft sleeve, and the installation groove faces away from the rolling bearing;

The elastic piece is embedded in the installation groove and supports the bearing cover and the shaft sleeve;

along the radial direction, there is a first gap between the bearing cover and the shaft sleeve;

The shaft sleeve is in clearance fit with the rotating shaft.

According to an aspect of the present invention, the bearing cover includes a connecting portion connected with the shaft sleeve, and a mounting portion connected with the end cover away from the shaft sleeve;

The thickness of the connecting portion is smaller than the thickness of the mounting portion;

The connecting portion is connected to a side of the mounting portion adjacent to the rolling bearing.

According to an aspect of the present invention, the installation groove is composed of the side wall of the installation part, the side wall of the connecting part and the side wall of the shaft sleeve.

According to an aspect of the present invention, along a direction away from the rolling bearing, a first recessed portion, a raised portion and a second recessed portion are sequentially provided on the side of the bushing away from the rotating shaft;

There is the first gap between the first recessed portion and the end face of the connecting portion;

A side wall of the protruding portion adjacent to the first recessed portion abuts against a side wall of the connecting portion.

According to an aspect of the present invention, one end of the elastic member is connected with the second recessed portion, and the other end is connected with the mounting portion.

According to an aspect of the present invention, a first positioning groove is provided on a side of the side wall of the mounting portion away from the connecting portion;

A second positioning groove is provided on the side of the second recessed portion away from the raised portion;

One end of the elastic member is fixed in the first positioning groove, the other end is fixed in the second positioning groove, and the elastic member is integrally embedded in the installation groove.

According to an aspect of the present invention, the elastic member is a corrugated ring.

According to an aspect of the present invention, the distance between the apex of the corrugated ring adjacent to the connecting portion and the side wall of the connecting portion is 0.5-1 mm.

According to an aspect of the present invention, the width of the first gap is 2.5-3 mm.

According to an aspect of the present invention, the width of the gap between the shaft sleeve and the rotating shaft is 0.15-0.3 mm.

According to one aspect of the present invention, the material of the shaft sleeve is tin bronze powder metallurgy material, and an oil-containing structure for self-lubrication is provided thereon.

According to an aspect of the present invention, the surface of the rotating shaft corresponding to the shaft sleeve is hardened and polished, and its surface roughness is Ra<0.4.

According to one solution of the present invention, when the bearing cover rotates with the end cover, the elastic member and the shaft sleeve rotate together, and slight friction occurs between the shaft sleeve and the rotating shaft. Since the bearing grease will reach the friction surface and there is no relative pressure, the friction The force is very small and there is no wear. If the bearing cover and the rotating shaft are radially eccentric, the elastic member will be compressed and squeezed outward due to its characteristics, so the shaft sleeve can be floated with the rotating shaft without generating a large radial pressure, and will not wear and maintain The flameproof gap meets the requirements.

According to one solution of the present invention, the installation groove is arranged away from the rolling bearing, that is, the installation groove is isolated from the rolling bearing by the connecting part. The sleeve and the elastic member move outward (ie, in the direction of the rolling bearing). At this time, the sleeve and the elastic member can be blocked by the bearing cover, specifically the connecting portion of the bearing cover, and the contact surface is on the right side wall of the connecting portion. In this way, the elastic part will not be deformed greatly, and the sealing property is still maintained.

According to one solution of the present invention, there is an explosion-proof gap between the first recessed part of the shaft sleeve and the connecting part, and at the same time, the above-mentioned explosion-proof gap is formed between the shaft sleeve and the rotating shaft, so that the explosion-proof structure of the present invention has a radial compensation function, In this way, even if the rolling bearing is damaged, the bearing cover will not be damaged, and the above-mentioned flameproof gap will not be damaged, and the flameproof gap can be maintained to meet the flameproof requirements. Not only that, the connection part is in contact with the convex part beside the first concave part, so that the explosion-proof structure is axially sealed. At the same time, the bellows is arranged in the installation groove as a whole, and the upper and lower installation ends are located on the side of the overall center of gravity, so that when a gas explosion occurs inside the drum, the air pressure can push the bellows ring to move outward, and the bellows ring can be The main body of the bearing cap is blocked, so that the corrugated ring will not be greatly deformed, and the sealing is still maintained,

The explosion-proof structure of the drum motor of the present invention can ensure the service life and maintain high working efficiency under the condition of long-term work. Not only that, the overall structure of the explosion-proof structure is simple, but it is safe and reliable to use.

Description of drawings

1 schematically shows a cross-sectional view of a flameproof structure of a drum motor according to an embodiment of the present invention;

FIG. 2 schematically shows an enlarged view of part A in FIG. 1 .

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

FIG. 1 schematically shows a cross-sectional view of a flameproof structure of a drum motor according to an embodiment of the present invention; FIG. 2 schematically shows an enlarged view of part A in FIG. 1 .

1 and 2 , in this embodiment, the flameproof structure of the drum motor includes a rotating shaft 1 , a rolling bearing 2 , an end cover 3 , a shaft sleeve 4 , a bearing cover 5 and an elastic member 6 . Among them, the rolling bearing 2 is installed between the end cover 3 and the rotating shaft 1 .

In this embodiment, an installation groove 7 is formed between the bearing cover 5 and the shaft sleeve 4 , the installation groove 7 is used for installing the elastic member 6 , and the installation groove 7 is arranged away from the rolling bearing 2 . In this embodiment, the elastic member 6 is embedded in the installation groove 7, and uses its elastic properties to support the bearing cover 5 and the shaft sleeve 4, so as to ensure that the bearing cover 5 and the shaft sleeve 4 can maintain a stable position when subjected to external force, ensuring that The structure is stable and reliable.

Further, along the radial direction, that is, the up-down direction in FIGS. 1 and 2 , there is a first gap between the bearing cover 5 and the shaft sleeve 4 , and the first gap is an explosion-proof gap.

Not only that, in this embodiment, there is also a gap between the shaft sleeve 4 and the rotating shaft 1 , that is, there is a clearance fit connection between the two, and the gap is also an explosion-proof gap.

According to the above embodiment of the present invention, when the bearing cover 5 rotates with the end cover 3, the elastic member 6 and the shaft sleeve 4 rotate together, and slight friction occurs between the shaft sleeve 4 and the rotating shaft 1. Since the bearing grease will reach the friction surface, And there is no relative pressure, so there is little friction and no wear. If the bearing cover 5 and the shaft 1 are radially eccentric, the elastic member 6 is compressed and squeezed outward due to its characteristics, so that the shaft sleeve 4 can float with the shaft 1 without generating a large radial pressure. Will not wear out and maintain flameproof clearances as required.

Further, according to an embodiment of the present invention, the bearing cover 5 includes a connecting portion 501 and a mounting portion 502 . As shown in FIG. 2 , in this embodiment, the mounting portion 502 is located on the connecting portion 501 and has a relatively thick thickness. It is mainly used for connecting with the end cover 3 , and can be connected by screw connection as shown in the figure. . The connecting portion 501 is located below the mounting portion 502 , and its thickness is relatively thin, which is mainly used for connecting with the shaft sleeve 4 . As shown in FIG. 2 , in this embodiment, the connecting portion 501 and the mounting portion 502 are connected on the side close to the rolling bearing 2 . Specifically, since the thickness of the connection part 501 is smaller than that of the installation part 502 , the connection part 501 may be connected to the left, center or right side of the lower end of the installation part 502 during connection. In this embodiment, as shown in FIG. 2 , the connecting portion 501 is connected to the left side of the lower end portion of the mounting portion 502 . The purpose of this setting is to make a step between the connecting portion 501 and the mounting portion 502 , and then make The step faces away from the rolling bearing 2, so that the step cooperates with the shaft sleeve 4 to form the above-mentioned mounting groove 7. It can be seen that the mounting groove 7 consists of the side wall (lower side wall) of the mounting portion 502 and the side wall (right side wall) of the connecting portion. wall) and the side wall (upper side wall) of the bushing 4 together.

According to the above-mentioned embodiment of the present invention, the installation groove 7 is arranged away from the rolling bearing 2, that is, the installation groove 7 is isolated from the rolling bearing 2 by the connecting portion 501. The advantage of this setting is that in the event of an accident, gas is generated inside the drum motor. During the explosion, the air pressure pushes the shaft sleeve 4 and the elastic member 6 to move outward (that is, in the direction of the rolling bearing 2 ). At this time, the shaft sleeve 4 and the elastic member 6 can be blocked by the bearing cover 5 , specifically by the connecting portion 501 of the bearing cover 5 . Block, the contact surface is on the right side wall of the connecting part 501 . In this way, the elastic part will not be deformed greatly, and the sealing property is still maintained.

In this embodiment, the elastic member 6 adopts a corrugated ring.

Further, according to an embodiment of the present invention, as shown in FIG. 2 , along the direction away from the rolling bearing 2 (ie, the direction from left to right in FIG. 2 ), the side of the shaft sleeve 4 away from the rotating shaft 1 (ie, the direction from left to right in FIG. 2 ) 2) The upper side of the shaft sleeve 4) is provided with a first concave portion 401, a convex portion 402 and a second concave portion 403 in sequence. As shown in FIG. 2 , in this embodiment, the first concave portion 401 and the connecting portion 501 are arranged in cooperation with each other, and have the same width. There is a gap between a recessed portion 401 , and the gap is the above-mentioned first gap, and the first gap is an explosion-proof gap. Further, as shown in FIG. 2 , since sealing is required and there is a gap between the first recessed portion 401 and the connecting portion 501, a raised portion 402 is provided beside the first recessed portion 401 in this embodiment. As shown in FIG. 2 , the left side wall of the protruding portion 402 and the side wall of the connecting portion 501 abut against each other, so that the sealed connection between the bearing cover 5 and the shaft sleeve 4 is achieved.

In addition, the second concave portion 403 on the right side of the raised portion 402 is used for connecting with the above-mentioned corrugated pipe. As shown in FIG. 2 , the upper end of the corrugated pipe is connected with the lower side wall of the mounting portion 502, is connected to the second recessed portion 403 . Specifically, as shown in FIG. 2 , in this embodiment, a first positioning groove 5021 is provided on the side of the lower side wall of the mounting portion 502 away from the connecting portion 501 (ie, the right side in FIG. 2 ). The side of the second recessed portion 403 away from the raised portion 402 (ie, the right side in FIG. 2 ) is provided with a second positioning groove 4031 . As shown in FIG. 2 , in this embodiment, the upper end of the corrugated pipe is fixed in the first positioning groove 5021, and the lower end is fixed in the second positioning groove 4031. It can be seen from FIG. 2 that, in fact, the corrugated pipe is integrally embedded and installed. In the groove 7, that is, the two ends of the bellows extending out (that is, the mounting ends) are fixedly installed on the end walls of the bearing cover 5 and the shaft sleeve 4, respectively. One side of rolling bearing 2.

According to the above-mentioned embodiment of the present invention, the first concave portion 401 of the shaft sleeve 4 and the connecting portion 501 have the above-mentioned explosion-proof gap, and at the same time, there is the above-mentioned explosion-proof gap between the shaft sleeve 4 and the rotating shaft 1, so that the explosion-proof gap of the present invention is provided. The structure has a radial compensation function, so that even if the rolling bearing 2 is damaged, the bearing cover 5 will not be damaged, nor will the above-mentioned flameproof gap be damaged, and the flameproof gap can be maintained to meet the flameproof requirements. Not only that, the connection portion 501 abuts against the protruding portion 402 beside the first recessed portion 401 so that the flameproof structure is axially sealed. At the same time, the bellows is arranged in the installation groove 7 as a whole, and the two protruding upper and lower installation ends are located on the side (that is, the right side) of the overall center of gravity, so that when a gas explosion occurs inside the drum, the air pressure can push the corrugated ring outward ( moving in the direction of rolling bearing 2), at this time, the corrugated ring can be blocked by the main body of the bearing cover 5 (ie, the right side wall of the connecting portion 501), which can effectively prevent the corrugated ring from being greatly deformed, still maintain the sealing, and increase the Working life, ensure the working efficiency of the drum motor.

Further, according to an embodiment of the present invention, the distance between the apex of the corrugated ring adjacent to the connecting portion 501 and the right side wall of the connecting portion 501 is 0.5-1 mm. This distance can prevent the corrugated ring from being greatly deformed in this embodiment. Of course, this distance cannot limit the present invention, it is only a preferred way, and the specific distance can be selected and changed according to actual needs, the use scene of the drum motor and various specific parameters and other conditions. In the present invention, as long as the elastic member 6 ( The corrugated ring) can ensure normal work for a long time within the range of deformability and fatigue strength.

In addition, according to an embodiment of the present invention, the width of the first gap between the connecting portion 501 and the first recessed portion 401 is 2.5-3 mm, and the width of the gap between the shaft sleeve 4 and the rotating shaft 1 is 0.15-0.3 mm. Likewise, the width of the two gaps is also only a preferred way, which does not limit the present invention. In the present invention, as long as the width of the gap can meet the explosion-proof requirements.

In addition, according to an embodiment of the present invention, the material of the shaft sleeve 4 is tin bronze powder metallurgy material, and the shaft sleeve 4 is provided with an oil-containing structure, that is, the oil-containing treatment is performed, which can be self-lubricating, so that no lubrication maintenance is required, and the Self-lubricating properties. Moreover, in this embodiment, the surface of the rotating shaft 1 corresponding to the shaft sleeve 4 is hardened and polished, and the surface roughness Ra<0.4.

To sum up, according to the above-mentioned embodiments of the present invention, the explosion-proof structure of the drum motor of the present invention can ensure the service life, and maintain high working efficiency in the case of long-term work. Not only that, it can be seen from the above that the overall structure of the explosion-proof structure is simple, but the use is safe and reliable. When the gas explodes, when the air pressure pushes the elastic member 6 and the shaft sleeve 4 to move, the shape of the elastic member 6 and the shaft sleeve 4 can be kept from being greatly affected, and no large deformation will occur, thereby ensuring the sealing of the overall structure.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should Various changes may be made in details without departing from the scope of the invention as defined by the claims.

Claims

The explosion-proof structure of a drum motor is characterized in that it comprises a rotating shaft (1), a rolling bearing (2), an end cover (3), a shaft sleeve (4), a bearing cover (5) and an elastic member (6), the rolling bearing ( 2) Installed between the end cover (3) and the rotating shaft (1);

An installation groove (7) is formed between the bearing cover (5) and the shaft sleeve (4), and the installation groove (7) faces away from the rolling bearing (2);

The elastic member (6) is embedded in the installation groove (7) and supports the bearing cover (5) and the shaft sleeve (4);

Along the radial direction, there is a first gap between the bearing cover (5) and the shaft sleeve (4);

The shaft sleeve (4) is in clearance fit with the rotating shaft (1);

The bearing cover (5) includes a connecting portion (501) connected with the shaft sleeve (4), and a mounting portion (502) away from the shaft sleeve (4) and connected with the end cover (3);

The thickness of the connecting portion (501) is smaller than the thickness of the mounting portion (502);

The connecting portion (501) is connected to a side of the mounting portion (502) adjacent to the rolling bearing (2).
The explosion-proof structure of the drum motor according to claim 1, characterized in that, the installation groove (7) consists of the side wall of the installation part (502), the side wall of the connection part (501) and the The side walls of the shaft sleeve (4) are formed together.
The explosion-proof structure of the drum motor according to claim 2, characterized in that, along the direction away from the rolling bearing (2), the side of the shaft sleeve (4) away from the rotating shaft (1) is sequentially provided with a first recessed portion (401), a raised portion (402) and a second recessed portion (403);

There is the first gap between the first recessed portion (401) and the end face of the connecting portion (501);

The raised portion (402) is adjacent to the sidewall of the first recessed portion (401) and abuts against the sidewall of the connection portion (501).
The explosion-proof structure for a drum motor according to claim 3, characterized in that, one end of the elastic member (6) is connected to the second recessed portion (403), and the other end is connected to the mounting portion (502). .
The explosion-proof structure for a drum motor according to claim 4, characterized in that, a first positioning groove (5021) is provided on the side wall of the mounting portion (502) away from the connecting portion (501) on the side );

A second positioning groove (4031) is provided on the side of the second recessed portion (403) away from the raised portion (402);

One end of the elastic member (6) is fixed in the first positioning groove (5021), the other end is fixed in the second positioning groove (4031), and the elastic member (6) is integrally embedded in the installation groove ( 7) Inside.
The explosion-proof structure of a drum motor according to claim 5, characterized in that, the elastic member (6) is a corrugated ring.
The explosion-proof structure of the drum motor according to claim 6, characterized in that, the distance between the apex of the corrugated ring adjacent to the connecting portion (501) and the side wall of the connecting portion (501) is 0.5- 1mm.
The explosion-proof structure of the drum motor according to claim 1, wherein the width of the first gap is 2.5-3 mm.
The explosion-proof structure of a drum motor according to claim 1, characterized in that the width of the gap between the shaft sleeve (4) and the rotating shaft (1) is 0.15-0.3 mm.
The explosion-proof structure of a drum motor according to claim 1, characterized in that, the material of the shaft sleeve (4) is tin bronze powder metallurgy material, and an oil-containing structure for self-lubricating is provided thereon.
The explosion-proof structure of a drum motor according to any one of claims 1 to 10, characterized in that, the surface of the rotating shaft (1) corresponding to the shaft sleeve (4) is hardened and polished, and the surface of the shaft (1) is hardened and polished. Roughness Ra<0.4.