CN211266643U - Electric machine - Google Patents

Abstract

The utility model provides a motor, this motor includes: the motor comprises a motor base, a rotor, a sliding bearing, an end cover and an inner sealing device; the side wall of the motor base is connected with the end cover; the outer side of the end cover is connected with the sliding bearing; the inner side of the end cover is connected with the inner sealing device; the rotating shaft of the rotor sequentially penetrates through the inner sealing device and the end cover and then is connected with the sliding bearing; the inner sealing device is used for isolating a space region which can be reached by the fan airflow in the motor base from a protective space region, wherein the protective space region is a space region formed by the sliding bearing, the end cover, the inner sealing device and the rotating shaft in a surrounding mode; the end cover is provided with at least one vent hole which enables the protection space area to be communicated with the space area where the sliding bearing is located. The sliding bearing oil leakage problem in the motor can be solved.

Description

Electric machine

Technical Field

The utility model relates to an electrical engineering technical field, in particular to motor.

Background

The motor is a device for converting electric energy into mechanical energy, and is used as a power source of various machines. The bearings commonly used in the motor comprise four types, namely a rolling bearing, a sliding bearing, a joint bearing and an oil-retaining bearing, wherein the sliding bearing has the characteristics of simple structure, strong bearing capacity, good shock resistance and the like, so that the sliding bearing is widely applied to a large motor with high speed, high precision and heavy load.

In the motor using the sliding bearing, the sliding bearing is arranged on the outer wall of a motor base, one side of the sliding bearing is communicated with the inside of the motor, the other side of the sliding bearing is communicated with the outside of the motor, certain negative pressure can be generated in the motor under the action of a fan during the operation of the motor, so that the pressure difference between the inside and the outside of an oil chamber in the sliding bearing is increased, and in addition, lubricating oil has certain pressure when the sliding bearing forcibly lubricates the bearing bush, so that the oil leakage of the sliding bearing is.

At present, a scheme capable of effectively solving the oil leakage problem of the sliding bearing in the motor does not exist, oil seals can only be replaced regularly, and the oil leakage problem of the sliding bearing in the motor cannot be solved fundamentally.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a motor can solve the problem of slide bearing oil leak in the motor.

In a first aspect, an embodiment of the present invention provides a motor, including: the motor comprises a motor base, a rotor, a sliding bearing, an end cover and an inner sealing device;

the side wall of the motor base is connected with the end cover;

the outer side of the end cover is connected with the sliding bearing;

the inner side of the end cover is connected with the inner sealing device;

the rotating shaft of the rotor sequentially penetrates through the inner sealing device and the end cover and then is connected with the sliding bearing;

the inner sealing device is used for isolating a space region which can be reached by the fan airflow in the motor base from a protective space region, wherein the protective space region is a space region formed by the sliding bearing, the end cover, the inner sealing device and the rotating shaft in a surrounding mode;

the end cover is provided with at least one vent hole which enables the protection space area to be communicated with the space area where the sliding bearing is located.

In a first possible implementation manner, with reference to the first aspect, the motor further includes: at least one air intake protecting cover;

each vent hole is provided with one air inlet protective cover;

the air inlet protective cover is used for filtering air flow entering the protective space area from the vent hole.

In a second possible implementation manner, in combination with the first possible implementation manner,

the protective cover admits air includes: a protective head and a mounting tube;

the protective head is of a cylindrical structure with one closed end, and the mounting pipe is of a circular tubular structure;

the opening end of the protective head is communicated with the mounting pipe;

at least one airflow hole is formed in the side wall of the protection head, and a filter screen for limiting dust and liquid to pass through is arranged in each airflow hole;

the mounting tube is used for being matched with the vent hole so that air flow can enter and exit the protection space region through the air flow hole.

In a third possible implementation manner, with reference to the first aspect, the end cap includes: a first radial disk and a first axial cylinder;

the first radial disc is of a circular sheet structure, and the first axial cylinder is of a cylindrical structure;

the inner side of the first radial disk is connected with one end of the first axial cylinder, and the outer side of the first radial disk is connected with the sliding bearing;

the other end of the first axial cylinder is connected with the inner sealing device.

In a fourth possible implementation manner, with reference to the first aspect, the inner sealing device includes: a second radial disk and a second axial cylinder;

the second radial disc is of a circular sheet structure, and the second axial cylinder is of a cylindrical structure;

one end of the second axial cylinder is connected with the second radial disc;

the other end of the second axial cylinder is connected with the inner side of the end cover.

In a fifth possible implementation manner, in combination with the first aspect,

the end cap comprises a third radial disc and a third axial cylinder;

said inner sealing means comprises a fourth radial disc and a fourth axial cylinder;

the third radial disc and the fourth radial disc are both in circular sheet structures, and the third axial cylinder and the fourth axial cylinder are both in cylindrical structures;

the outer side of the third radial disk is connected with the sliding bearing, and the inner side of the third radial disk is connected with one end of the third axial cylinder;

one side of the fourth radial disc is connected with one end of the fourth axial cylinder;

the other end of the third axial cylinder is butted against the other end of the fourth axial cylinder.

In a sixth possible implementation manner, in combination with the first aspect,

the inner sealing device is of a circular sheet structure, and the middle part of the inner sealing device is provided with a shaft hole for the rotating shaft to pass through;

at least one closed sealing groove is formed in the circumferential side wall of the shaft hole along the circumferential direction, and an annular sealing ring is arranged in each sealing groove;

the rotating shaft penetrates through each sealing ring, and the circumferential surface of the rotating shaft is in contact with each sealing ring;

the seal ring is used for limiting air flow to pass through the inner sealing device.

In a seventh possible implementation manner, with reference to the first aspect, the inner sealing device includes: a fifth radial disc and an air duct;

the fifth radial disc is of a circular sheet structure, and the air guide cylinder is of a cylindrical structure;

one side of the fifth radial disc is connected with the end cover, the other side of the fifth radial disc is connected with one end of the air guide cylinder, and the other end of the air guide cylinder is a free end;

the rotating shaft penetrates through the air guide cylinder along the axial direction of the air guide cylinder;

the air duct is used for guiding the flow direction of the fan air flow in the motor base so as to reduce the negative pressure in the air duct.

In an eighth possible implementation manner, in combination with the seventh possible implementation manner,

the diameter of the air duct is larger than that of a balance disc arranged on the rotating shaft;

the length of the air duct in the axial direction of the air duct is equal to the distance between the fifth radial circular disc and the balance disc.

In a ninth possible implementation manner, with reference to the first aspect and the first possible implementation manner, the second possible implementation manner, the third possible implementation manner, the fourth possible implementation manner, the fifth possible implementation manner, the sixth possible implementation manner, the seventh possible implementation manner, the eighth possible implementation manner, and the ninth possible implementation manner of the first aspect,

the end cover is connected with the side wall of the motor base through a bolt;

the sliding bearing is connected with the end cover through a bolt;

the inner sealing device is connected with the end cover through a bolt.

According to the technical scheme, the sliding bearing, the end cover, the inner sealing device and the rotating shaft of the rotor form a protection space area in a surrounding mode, the protection space area is isolated from a space area which can be reached by fan airflow in the motor base, negative pressure generated by the operation of the fan in the motor base can not act on the sliding bearing, and air pressure on two sides of the sliding bearing can be the same through the vent holes formed in the end cover, so that the problem of oil leakage caused by large pressure difference between the inside and the outside of an oil chamber of the sliding bearing in the motor can be solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an electric machine according to an embodiment of the present invention;

fig. 2 is a schematic view of an electric machine including an air inlet protective cover according to an embodiment of the present invention;

FIG. 3 is a schematic view of an air inlet protective cover according to an embodiment of the present invention;

fig. 4 is a schematic view of a connection structure between an end cap and an inner sealing device according to an embodiment of the present invention;

fig. 5 is a schematic view of another connection structure between the end cap and the inner sealing device according to an embodiment of the present invention;

fig. 6 is a schematic view of a connection structure between an end cap and an inner sealing device according to an embodiment of the present invention;

fig. 7 is a schematic view of an internal sealing device according to an embodiment of the present invention;

fig. 8 is a schematic view of an electric machine including an air duct according to an embodiment of the present invention;

fig. 9 is a schematic view of another electric machine including an air duct according to an embodiment of the present invention;

fig. 10 is a schematic view of another electric machine according to an embodiment of the present invention.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments, based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides an electric machine, including: the motor base 10, the rotor 20, the sliding bearing 30, the end cover 40 and the inner sealing device 50;

the side wall of the motor base 10 is connected with an end cover 40, the outer side of the end cover 40 is connected with a sliding bearing 30, and the inner side of the end cover 40 is connected with an inner sealing device 50;

the rotating shaft 201 of the rotor 20 is connected with the sliding bearing 30 after sequentially passing through the inner sealing device 50 and the end cover 40;

the inner sealing device 50 can isolate the space region which can be reached by the fan airflow in the motor base 10 from a protective space region 60 which is formed by the sliding bearing 30, the end cover 40, the inner sealing device 50 and the rotating shaft 201;

the end cap 40 is provided with at least one ventilation hole 401 which allows the protected space region 60 to communicate with the space region in which the slide bearing 30 is located.

In the embodiment of the present invention, the rotation axis 201 of the sliding bearing 30, the end cover 40, the inner sealing device 50 and the rotor 20 surrounds the protection space region 60, the space region that the fan airflow can reach in the protection space region 60 and the motor base 10 is isolated, the negative pressure generated by the fan operation in the motor base 10 can not be applied to the sliding bearing 30, and the air vent 401 arranged on the end cover 40 can make the air pressure at both sides of the sliding bearing 30 the same, so as to solve the oil leakage problem caused by the large pressure difference between the inside and the outside of the oil chamber of the sliding bearing in the motor.

In the embodiment of the present invention, in order to avoid the negative pressure generated by the operation of the fan from acting on the sliding bearing 30, the space region that the fan airflow can reach in the motor base 10 is isolated from the protection space region 60 by the inner sealing device 50, thereby avoiding the space region where the fan is located in the protection space region 60 and the motor base 10 from performing gas exchange, in order to achieve this purpose, the sealing property of connection between each component constituting the protection space region 60 needs to be ensured, therefore, in the connection relationship between each component described in the above embodiment, except the connection between the rotating shaft 201 and the sliding bearing 30, the connection between other components is all a sealing connection. For example, the end cap 40 is hermetically connected to the sliding bearing 30, the end cap 40 is hermetically connected to the inner sealing device 50, and the rotating shaft 201 is hermetically connected to both the inner sealing device 50 and the sliding bearing 30.

In the embodiment of the present invention, in order to ensure the sealing performance of the connection between the components, a sealing gasket may be disposed between the two connected components, for example, the sealing gasket is disposed between the end cover 40 and the inner sealing device 50, and the sealing gasket is disposed between the end cover 40 and the side wall of the motor base 10.

Alternatively, on the basis of the electric machine shown in fig. 1, in order to avoid the entry of impurities from the ventilation opening 401 into the protected space region 60, a matching intake air filter device can be mounted on the ventilation opening 401. As shown in fig. 2, for each vent 401 provided in the end cap 40, a gas inlet protecting cover 70 is provided on the vent 401, and the gas flow entering the protected space region 60 from the vent 401 is filtered by the gas inlet protecting cover 70.

In the embodiment of the present invention, a plurality of air vents 401 for balancing air pressure at two sides of the sliding bearing 30 are provided on the end cover 40, there may be air flow entering the protection space region 60 through the air vent 401 in the motor operation process, through setting the air inlet protective cover 70 on the air vent 401, the air flow entering the protection space region 60 from the air vent 401 can be filtered by the air inlet protective cover 70, so as to limit dust and liquid mixed with in the air flow to enter the protection space region 60 from the air vent 401, on one hand, the air pressure balance at two sides of the sliding bearing 30 is influenced by blocking the air vent 401 by the dust and the liquid, on the other hand, the normal operation of the motor can be influenced by the fact that the dust and the.

Optionally, on the basis of the motor shown in fig. 2, the air intake protecting cover 70 is used for filtering the airflow entering the protected space region 60, and particularly, a filter screen may be disposed on the air intake protecting cover 70 to filter dust and liquid in the airflow entering the protected space region 60. As shown in fig. 3, the air intake protecting cover 70 includes a protecting head 701 and a mounting tube 702, the protecting head 701 is a cylindrical structure with one end closed, the mounting tube 702 is a circular tube structure, the open end of the protecting head 701 is communicated with one end of the mounting tube 702, a plurality of airflow holes 7011 are provided on the side wall of the protecting head 701, a filter screen for limiting dust and liquid to pass through is provided in each airflow hole 7011, and the mounting tube 702 is used for cooperating with a vent hole provided on the end cap 40, so that the airflow can pass through the airflow hole (7011) on the protecting head 701 to enter and exit the protected space region 60.

The embodiment of the utility model provides an in, be provided with a plurality of air current holes 7011 on the lateral wall of protection head 701, all be provided with the filter screen in each air current hole 7011, when the regional air current of space that slide bearing 30 is located will get into protection space region 60, the air current at first gets into air current hole 7011, and the air current gets into protection head 701 after the filter screen filtration in air current hole 7011 inside, later gets into protection space region 60 through the installation pipe 702 that is linked together with protection head 701. Through the filtration of filter screen, can prevent that loaded dust and liquid in the air current from getting into protection space region 60, and then avoid dust and liquid to get into protection space region 60 and influence the normal operating of motor.

In the embodiment of the present invention, the filter screen is used to filter dust and liquid in the airflow, and the filter screen disposed in each airflow hole 7011 may be an integral filter screen, or an independent filter screen may be disposed in each airflow hole 7011. The airflow hole 7011 is formed in the side wall of the protective head 701, the flow direction of the airflow entering the protective head 701 from the airflow hole 7011 is changed, and the flow rate of the airflow can be reduced by changing the flow direction of the airflow, so that the effect of filtering the airflow by the filter screen is improved.

The embodiment of the utility model provides an in, it probably leads to too much dust and steam to get into inside motor frame 10 to set up air vent 401 on end cover 40, in order to guarantee that the motor can normal operating, need guarantee to admit air protective cover 70 and air vent 401 and cooperate the back and have higher dustproof and waterproof performance to avoid too much dust and steam to get into motor frame 10 and influence the normal operating of motor. For example, the protection level of the air intake protecting cover 70 needs to reach IP 54.

Alternatively, on the basis of the electric machine shown in fig. 1, since the shielded space region 60 is formed by the sliding bearing 30, the end cover 40, the inner seal device 50 and the rotating shaft 201 of the rotor 20, and the sliding bearing 30 is in close contact with the outer side of the end cover 40, the shielded space region 60 is located between the end cover 40 and the inner seal device 50, that is, a distance is provided between the end cover 40 and the inner seal device 50 in the axial direction of the rotating shaft 201. In order to be able to form a protected space region 60 between the end cap 40 and the inner seal 50, the end cap 40 and the inner seal 50 have a plurality of configurations, three different configurations of the end cap 40 and the inner seal 50 being described separately below.

For the first configuration of the end cap 40 and inner seal 50:

as shown in fig. 4, the end cap 40 includes a first radial disk 402 and a second axial cylinder 403, the first radial disk 402 has a circular sheet structure, the first axial cylinder 403 has a cylindrical structure, the inner side of the first radial disk 402 is connected to one end of the first axial cylinder 402, the outer side of the first radial disk 402 is connected to the sliding bearing 30, and the other end of the first axial cylinder 403 is connected to the inner seal device 50.

In the embodiment of the present invention, the end cover 40 includes the first radial disk 402 and the first axial cylinder 403, the outer side of the first radial disk 402 is connected to the sliding bearing 30, the inner side of the first radial disk 402 is connected to one end of the first axial cylinder 403, the other end of the first axial cylinder 403 is connected to the inner sealing device 50, and the axes of the first radial disk 402, the first axial cylinder 403, the inner sealing device 50 and the rotating shaft 201 are all overlapped to form the cylindrical protection space region 60 with the first radial disk 402 and the inner sealing device 50 as the top and the bottom, and the first axial cylinder 403 as the side wall.

In the embodiment of the present invention, the first radial disk 402 and the first axial cylinder 403 may be an integral structure to ensure the sealing property between the first radial disk 402 and the first axial cylinder 403, and the first radial disk 402 and the first axial cylinder 403 may be connected by welding.

For the second configuration of the end cap 40 and inner seal 50:

as shown in fig. 5, the inner sealing device 50 includes a second radial disk 501 and a second axial cylinder 502, the second radial disk 501 is a circular sheet structure, the second axial cylinder 502 is a cylindrical structure, one end of the second axial cylinder 502 is connected to the second radial disk 501, and the other end of the second axial cylinder 502 is connected to the inner side of the end cap 40.

In the embodiment of the present invention, the inner sealing device 50 includes the second radial disk 501 and the second axial cylinder 502, one end of the second axial cylinder 501 is connected to the second radial disk 501 to form the inner sealing device 50, one end of the second axial cylinder 502 is connected to the inner side of the end cover 40, and the axes of the second radial disk 501, the second axial cylinder 502, the inner sealing device 50 and the rotation shaft 201 are all overlapped to form the cylindrical protection space region 60 using the second radial disk 501 and the end cover 40 as the top and the bottom, and using the second axial cylinder 502 as the side wall.

In the embodiment of the present invention, the second radial disc 501 and the second axial cylinder 502 may be an integral structure to ensure the sealing performance between the second radial disc 501 and the second axial cylinder 502, and the second radial disc 501 and the second axial cylinder 502 may be connected by welding.

For the third configuration of the end cap 40 and the inner seal 50:

as shown in fig. 6, the end cap 40 includes a third radial disk 404 and a third axial cylinder 405, the inner sealing device 50 includes a fourth radial disk 503 and a fourth axial cylinder 504, the third radial disk 404 and the fourth radial disk 503 are both in a circular sheet structure, the third axial cylinder 405 and the fourth axial cylinder 504 are both in a cylindrical structure, the outer side of the third radial disk 404 is connected with the sliding bearing 30, the inner side of the third radial disk 404 is connected with one end of the third axial cylinder 405, one side of the fourth radial disk 503 is connected with one end of the fourth axial cylinder 504, and the other end of the third axial cylinder 405 is connected with the other end of the fourth axial cylinder 504.

In the embodiment of the present invention, the third radial disc 404 having a circular sheet structure is connected to one end of the third axial cylinder 405 having a cylindrical shape to form the end cap 40, the fourth radial disc 503 having a circular sheet structure is connected to one end of the fourth axial cylinder 504 having a cylindrical shape to form the inner sealing device 50, and after the other end of the third axial cylinder 405 is butted to the other end of the fourth axial cylinder 504, the cylindrical protection space region 60 having the third radial disc 404 and the fourth radial disc 503 as the top and the bottom and the third axial cylinder 405 and the fourth axial cylinder 504 butted together as the side walls is formed.

In the embodiment of the present invention, the third radial disk 404 and the third axial cylinder 405 may be an integral structure to ensure the sealing property of the connection between the third radial disk 404 and the third axial cylinder 405, and correspondingly, the fourth radial disk 503 and the fourth axial cylinder 504 may also be an integral structure to ensure the sealing property of the connection between the fourth radial disk 503 and the fourth axial cylinder 504. Specifically, the third radial disk 404 and the third axial cylinder 405 may be connected by welding, and the fourth radial disk 503 and the fourth axial cylinder 504 may be connected by welding.

In summary, the end cap 40 and the inner sealing device 50 have various structural forms to form the protected space region 60, and the specific structural form of the end cap 40 and the inner sealing device 50 may be any one of the three structural forms according to the structure of the motor, the assembling convenience degree and the processing difficulty degree.

Alternatively, on the basis of the motor shown in fig. 1, since the shielded space region 60 is formed by surrounding the sliding bearing 30, the end cover 40, the inner sealing device 50 and the rotating shaft 201 of the rotor 20, and the inner sealing device 50 isolates the shielded space region 60 from the space region within the motor base 10 where the fan airflow can reach, the rotating shaft 201 of the rotor 20 needs to rotate through the inner sealing device 50, and therefore, the sealing property between the inner sealing device 50 and the rotating shaft 201 needs to be ensured. As shown in fig. 7, the inner sealing device 50 is a circular sheet structure, a shaft hole 505 for passing the rotating shaft 201 is provided in the middle of the inner sealing device 50, at least one closed sealing groove 506 is provided on the annular sidewall of the shaft hole 505 along the circumferential direction, an annular sealing ring 507 is provided in each sealing groove 506, the rotating shaft 201 of the rotor 20 passes through each sealing ring 507, and the circumferential surface of the rotating shaft 201 contacts each sealing ring 507.

The embodiment of the present invention provides an axial hole 505 on the inner sealing device 50, one or more closed sealing grooves 506 are provided along the circumferential direction on the circumferential side wall of the axial hole 505, each sealing groove 506 is provided with an annular sealing ring 507, the rotating shaft 201 of the rotor 20 passes through each sealing ring 507, and the circumferential surface of the rotating shaft 201 contacts with the sealing ring 507, so that the rotating shaft 201 can normally rotate in the sealing ring 507 while the sealing ring 507 can limit the air flow to pass through the inner sealing device 50.

The embodiment of the utility model provides an in, set up sealing washer 507 through the hookup location including sealing device 50 with rotation axis 201, under the prerequisite that rotation axis 201 that guarantees rotor 20 can normally rotate, sealing washer 507 can keep apart the space of interior sealing device 50 both sides to guarantee that protection space region 60 can effectively keep apart with motor frame 10 interior fan region, avoid the produced negative pressure of fan operation to influence the atmospheric pressure in protection space region 60.

Alternatively, on the basis of the motor shown in fig. 1, although the inner sealing device 50 may isolate the protected space region 60 from the space region within the motor base 10 that the fan airflow can reach, the fan may generate an increased negative pressure at the connection position of the inner sealing device 50 and the rotating shaft 201, which may further cause a negative pressure in the protected space region 60, so that the air pressure at both sides of the sliding bearing 30 is unbalanced, and therefore the negative pressure generated at the connection position of the inner sealing device 50 and the rotating shaft 201 by the fan needs to be reduced.

As shown in fig. 8, the inner sealing device 50 includes a fifth radial disk 508 and an air guide duct 509, the fifth radial disk 508 is a circular sheet structure, the air guide duct 509 is a cylindrical structure, one side of the fifth radial disk 508 is connected to the end cover 40, the other side of the fifth radial disk 508 is connected to one end of the air guide duct 509, the other end of the air guide duct 509 is a free end, and the rotating shaft 201 of the rotor 20 passes through the air guide duct 509 in the axial direction of the air guide duct 509. The air duct 509 is used for guiding the flow direction of the fan airflow in the motor base 10 to reduce the negative pressure in the air duct 509.

In the embodiment of the present invention, the inner sealing device 50 is composed of a fifth radial disc 508 and an air duct 509, the fifth radial disc 508 is connected to the end cover 40 to form the protection space region 60, the air duct 509 is disposed on the other side of the fifth radial disc 508, and the rotating shaft 201 passes through the air duct 509 along the axial direction of the air duct 509 and then passes through the fifth radial disc 508. After fan airflow generated by the operation of the fan in the motor base 10 moves to the outer wall of the air duct 509 in the radial direction, the fan airflow will flow away from the fifth radial circular disk 508 in the axial direction under the action of the air duct 509, so that the fan airflow will not directly act on the connection position of the fifth radial circular disk 508 and the rotating shaft 201, and the negative pressure at the connection position of the fifth radial circular disk 508 and the rotating shaft 201 can be reduced, thereby preventing the air pressure in the protection space region 60 from being reduced due to the passing of the airflow from the connection position of the fifth radial circular disk 508 and the rotating shaft 201, and further preventing the occurrence of unbalanced air pressure at two sides of the sliding bearing 30, further ensuring the balanced air pressure at two sides of the sliding bearing 30, and avoiding oil leakage due to.

In the embodiment of the present invention, the fifth radial disk 508 and the air guiding barrel 509 may be connected by welding, and the sealing performance between the fifth radial disk 508 and the air guiding barrel 509 is ensured.

Alternatively, on the basis of the motor shown in fig. 8, as shown in fig. 9, a balance disk 80 is mounted on the rotating shaft of the rotor 20, the diameter of the air duct 509 is larger than that of the balance disk 80, and the length of the air duct 509 in the axial direction thereof is equal to the distance between the fifth radial circular disk 508 and the balance disk 80.

In the embodiment of the present invention, the balance plate 80 fixedly disposed on the rotating shaft 201 is used for adjusting the dynamic balance of the rotating shaft 201, and the balance plate 80 is usually disposed inside the motor base 10 near the sliding bearing 30, so that the diameter of the air duct 509 is smaller than the diameter of the balance plate 80 and the axial length of the air duct 509 is equal to the distance between the fifth radial disk 508 and the balance plate 80, and thus the balance plate 80 can block the fan airflow from entering the air duct 509 along the axial direction to some extent, so that the fifth radial disk 508 and the balance plate 80 form a relatively isolated space region, thereby further reducing the negative pressure at the connecting position of the fifth radial disk 508 and the rotating shaft 201.

Alternatively, on the basis of the motor provided in each of the above embodiments, the end cover 40 is connected to the side wall of the motor base 10 by bolts, the sliding bearing 30 is connected to the end cover 40 by bolts, and the inner sealing device 50 is connected to the end cover 40 by bolts.

The embodiment of the utility model provides an in, the continuous part all is connected through the bolt among end cover 40, motor frame 10, slide bearing 30, the interior sealing device 50, can conveniently install like this and dismantle, and then can carry out maintenance to the motor more conveniently.

Alternatively, on the basis of the motor provided in the above embodiments, since two sliding bearings 30 are usually included in the motor, the two sliding bearings 30 are respectively disposed on two opposite side walls of the motor base 10, and the rotor 20 is supported by the two sliding bearings 30. The foregoing embodiments are only described with respect to the connection relationship between one of the sliding bearings 30 and the motor base 10, and in a practical application scenario, at least two sliding bearings 30 are connected to the motor base 10, specifically as shown in fig. 10, since the connection relationships between the two sliding bearings 30 and the motor base 10 are the same, the connection relationships between the two sliding bearings 30 and the motor base 10, the rotor 20, and the end cover 30 and the inner sealing device 50 that are to be matched may refer to the description in the foregoing embodiments, and no further description is provided here.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.

Finally, it is to be noted that: the above description is only the preferred embodiment of the present invention, which is only used to illustrate the technical solution of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention is included in the protection scope of the present invention.

Claims (10)

1. An electric machine, comprising: the motor comprises a motor base (10), a rotor (20), a sliding bearing (30), an end cover (40) and an inner sealing device (50);

the side wall of the motor base (10) is connected with the end cover (40);

the outer side of the end cover (40) is connected with the sliding bearing (30);

the inner side of the end cover (40) is connected with the inner sealing device (50);

the rotating shaft (201) of the rotor (20) sequentially penetrates through the inner sealing device (50) and the end cover (40) and then is connected with the sliding bearing (30);

the inner sealing device (50) is used for isolating a space area which can be reached by the fan airflow in the motor base (10) from a protected space area (60), wherein the protected space area (60) is a space area which is formed by the sliding bearing (30), the end cover (40), the inner sealing device (50) and the rotating shaft (201) in a surrounding mode;

the end cover (40) is provided with at least one vent hole (401) which enables the protected space region (60) to be communicated with the space region where the sliding bearing (30) is located.

2. The electric machine of claim 1, further comprising: at least one air intake protecting cover (70);

-one air inlet protecting cover (70) is arranged on each air vent (401);

the air intake shield cover (70) for filtering air flow from the ventilation apertures (401) into the shielded space region (60).

3. The electric machine of claim 2,

the air intake shield cover (70) comprises: a protective head (701) and a mounting tube (702);

the protective head (701) is of a cylindrical structure with one closed end, and the mounting pipe (702) is of a circular tubular structure;

the open end of the protective head (701) is communicated with the mounting pipe (702);

at least one airflow hole (7011) is formed in the side wall of the protection head (701), and a filter screen for limiting dust and liquid to pass through is arranged in each airflow hole (7011);

the mounting tube (702) is adapted to cooperate with the vent (401) to allow airflow into and out of the shielded space region (60) through the airflow aperture (7011).

4. The electric machine of claim 1,

the end cap (40) includes: a first radial disc (402) and a first axial cylinder (403);

the first radial disc (402) is of a circular sheet structure, and the first axial cylinder (403) is of a cylindrical structure;

the inner side of the first radial disc (402) is connected to one end of the first axial cylinder (403), and the outer side of the first radial disc (402) is connected to the plain bearing (30);

the other end of the first axial cylinder (403) is connected to the inner sealing means (50).

5. The electric machine of claim 1,

the inner sealing device (50) comprises: a second radial disc (501) and a second axial cylinder (502);

the second radial disc (501) is of a circular sheet structure, and the second axial cylinder (502) is of a cylindrical structure;

one end of the second axial cylinder (502) is connected with the second radial disc (501);

the other end of the second axial cylinder (502) is connected to the inside of the end cap (40).

6. The electric machine of claim 1,

said end cap (40) comprising a third radial disc (404) and a third axial cylinder (405);

said inner sealing means (50) comprising a fourth radial disc (503) and a fourth axial cylinder (504);

the third radial disc (404) and the fourth radial disc (503) are both in a circular sheet-like structure, and the third axial cylinder (405) and the fourth axial cylinder (504) are both in a cylindrical structure;

the outer side of the third radial disc (404) is connected to the slide bearing (30), the inner side of the third radial disc (404) is connected to one end of the third axial cylinder (405);

one side of the fourth radial disc (503) is connected to one end of the fourth axial cylinder (504);

the other end of the third axial cylinder (405) abuts the other end of the fourth axial cylinder (504).

7. The electric machine of claim 1,

the inner sealing device (50) is of a circular sheet structure, and a shaft hole (505) for the rotating shaft (201) to pass through is formed in the middle of the inner sealing device (50);

at least one closed sealing groove (506) is arranged on the circumferential side wall of the shaft hole (505) along the circumferential direction, and an annular sealing ring (507) is arranged in each sealing groove (506);

the rotating shaft (201) penetrates through each sealing ring (507), and the circumferential surface of the rotating shaft (201) is in contact with each sealing ring (507);

the sealing ring (507) is used for limiting the air flow to pass through the inner sealing device (50).

8. The electric machine of claim 1,

the inner sealing device (50) comprises: a fifth radial disc (508) and an air guide duct (509);

the fifth radial disc (508) is of a circular sheet structure, and the air guide cylinder (509) is of a cylindrical structure;

one side of the fifth radial disc (508) is connected with the end cover (40), the other side of the fifth radial disc (508) is connected with one end of the air guide cylinder (509), and the other end of the air guide cylinder (509) is a free end;

the rotating shaft (201) penetrates through the air guide duct (509) along the axial direction of the air guide duct (509);

the air duct (509) is used for guiding the flow direction of the fan air flow in the motor base (10) so as to reduce the negative pressure in the air duct (509).

9. The electric machine of claim 8,

the diameter of the air duct (509) is larger than that of a balance disc (80) mounted on the rotating shaft (201);

the length of the air duct (509) in the axial direction thereof is equal to the distance between the fifth radial disc (508) and the balance disc (80).

10. The electrical machine according to any one of claims 1 to 9,

the end cover (40) is connected with the side wall of the motor base (10) through a bolt;

the sliding bearing (30) is connected with the end cover (40) through bolts;

the inner sealing device (50) is connected with the end cover (40) through bolts.

Images