CN112234740A

CN112234740A - Fixing device for motor rotating shaft and motor thereof

Info

Publication number: CN112234740A
Application number: CN202011004068.9A
Authority: CN
Inventors: 宋承林; 王大伟; 孙即明; 尚衍飞; 殷红顺
Original assignee: Qingdao CCS Electric Corp
Current assignee: Qingdao CCS Electric Corp
Priority date: 2020-09-22
Filing date: 2020-09-22
Publication date: 2021-01-15

Abstract

The invention discloses a fixing device for a motor rotating shaft and a motor thereof. Wherein the fixture is located on the motor end cap and includes: a stationary body having a first end and an oppositely directed second end, wherein the first end has a stationary surface for mounting the motor shaft and the second end has a sealing surface for sealing the end cap; and the fastening structure is connected with the second end of the fixed body and is used for moving the fixed body along the direction of the first end or the second end, wherein when the fixed body moves along the direction of the first end, the fixed surface is attached to the matching surface on the rotating shaft of the motor. When the fixing body is moved in the direction of the second end, to effect the sealing surface sealing against the end cap. The fixing device is ingenious in design, and not only can be used for fixing the rotating shaft of the motor, but also can be used for sealing the end cover.

Description

Fixing device for motor rotating shaft and motor thereof

Technical Field

The present invention relates generally to the field of electrical machines. More particularly, the present invention relates to a fixing device for a rotating shaft of a motor and a motor thereof.

Background

The motor is a common device in industrial production, and a bearing at one end of the motor is usually a cylindrical roller bearing, so that the rotor and a rotating shaft are easy to axially float in the transportation process, thereby causing damage to the motor bearing. In order to prevent axial movement of the rotor and the rotating shaft during transportation, a shaft end fixing sleeve is generally arranged at the position of the shaft head of the conventional motor and is fixed on the end cover. However, the conventional fixing sleeve is complicated in structure, and needs to be installed before transportation and disassembled when the motor or the all-in-one machine is used, thereby causing troublesome installation and disassembly.

Secondly, due to the particularity of the operation under the mine, the motor or the all-in-one machine applied to the environment has a special structure, so that a shaft end fixing sleeve cannot be mounted at the shaft end to fix the shaft end of the motor. In addition, the structure or the device used by the existing motor or all-in-one machine for fixing the shaft end to move cannot be disassembled, or although the structure can be disassembled, the structure is complex, so that the assembly and the disassembly are difficult. In addition, because integrated machines or motors are often used in explosive downhole environments, explosion proof requirements are also considered for the design of the holster.

Disclosure of Invention

In order to solve one or more problems of the background art, the present invention provides a method for fixing a rotating shaft during transportation; in use, the fixing device of the multifunctional motor rotating shaft seals the end cover. The fixing device provided by the invention has the advantages that the fixing column extrudes the motor rotating shaft along the axial direction by adjusting the fastening structure, so that the rotation and axial movement of the motor rotating shaft are avoided, and a motor bearing is protected. In addition, the fixing device can form an explosion-proof structure for sealing the end cover without disassembling or increasing other parts in the using process of the motor.

Specifically, the present invention discloses a fixing device for a motor shaft, comprising: a stationary body having a first end and an oppositely directed second end, wherein the first end has a stationary surface for holding the motor shaft and the second end has a sealing surface for sealing the end cap; and a fastening structure connected with the second end of the fixing body and used for moving the fixing body along the direction of the first end or the second end. When the fixing body moves along the direction of the first end, the fixing surface is attached to the matching surface on the motor rotating shaft; and when the fixing body is moved in the direction of the second end to effect the sealing surface sealing against the end cap.

In one embodiment, the fixing body includes a fixing head having one end on which the fixing surface is disposed to fix the motor rotation shaft.

In another embodiment, the other end of the fixed head is provided with the sealing surface which is used for being abutted with one side of the motor end cover close to the rotating shaft so as to seal the end cover.

In yet another embodiment, the sealing surface is an annular flat surface and has an O-ring groove disposed thereon, and an O-ring is disposed within the O-ring groove.

In one embodiment, the fixing body further comprises a body fixedly connected with one side of the sealing surface of the fixing head, the fastening structure comprises a first thread arranged on the body and a second thread arranged on the motor end cover, and the first thread and the second thread are matched with each other, so that the fixing body moves along the direction of the first end or the second end to fasten the fixing surface with the matching surface of the motor rotating shaft or seal the end cover.

In another embodiment, the second thread is disposed on a surface of a through hole penetrating through the motor end cover in the direction of the rotation shaft, and the body penetrates through the motor end cover through the matching of the first thread and the second thread, so that the fixing body moves in the direction of the first end or the second end.

In yet another embodiment, the fastening structure further comprises a nut having a third thread disposed thereon, the third thread cooperating with the first thread to axially retain the fixation body.

In one embodiment, the fastening structure further comprises an outer hexagonal structure arranged at the second end of the fixture body, wherein the outer hexagonal structure is rotated so as to move the fixture body in the direction of the first end or the second end.

In another embodiment, the first thread, the second thread and the third thread are explosion-proof threads meeting explosion-proof requirements respectively.

In yet another embodiment, the fixation surface is spherical.

The invention also discloses a motor which comprises the fixing device.

According to the fixing device for the motor rotating shaft, the first thread, the second thread and the third thread are all set to be the anti-explosion threads meeting the anti-explosion requirement, so that a motor provided with the fixing device meets the requirements of operation in the underground and other explosive environments. In addition, the fixing device has the advantages of simple structure, low cost, small size, easy processing, quick and convenient installation and operation and the like.

Drawings

The above-described features of the present invention will be better understood and its numerous objects, features, and advantages will be apparent to those skilled in the art by reading the following detailed description with reference to the accompanying drawings. The drawings in the following description are only some embodiments of the invention and other drawings may be derived by those skilled in the art without inventive effort, wherein:

fig. 1 is a schematic structural view showing a fixing device according to an embodiment of the present invention;

FIG. 2 is a block diagram illustrating a fixture according to an embodiment of the present invention; and

fig. 3 is a structural view showing a fitting relationship of a fixing device and a rotating shaft of a motor according to an embodiment of the present invention.

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, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a schematic structural view illustrating a fixing device according to an embodiment of the present invention. In order to facilitate understanding of the structure and function of the fixing device of the present invention, fig. 1 also depicts the components and structures of the end cover 101, the motor shaft 105 and the motor shaft mating surface 106 of the motor.

As shown in fig. 1, the fixing device of the present invention is disposed on the motor cover 101, and may include a fixing body 102 and a fastening structure 103. In one embodiment, the first end of the fixing body has a fixing surface 104 for fixing the rotating shaft of the motor, and the second end of the fixing body is connected to the fastening structure. The fastening structure is used for moving the fixing body along the direction of the first end or the second end. In one scenario, when the fixing body moves along the direction of the first end, the fixing surface can be attached to a matching surface 106, which is matched with the fixing surface, on the rotating shaft 105 of the motor. In another scenario, the sealing of the end cap by the fixture may be achieved when the fixture is moved in the direction of the second end.

In particular, as shown in fig. 1, the fixing device of the present invention may be mounted on the motor end cover. The motor end cover and the motor rotating shaft can have a certain distance. As shown by the oval dashed box in fig. 1, the fastening structure may have various forms, for example, a spiral structure or a snap structure. The fastening structure may also be a partial structure including an end cap disposed on the motor. The fastening structure is matched with the end cover, so that the fixing body is driven to move along the direction of the rotating shaft of the motor (namely along the direction of the first end or the second end of the fixing body). In one embodiment, the fixing surface at one end of the fixing body and the matching surface on the rotating shaft of the motor can be the same in shape and size.

In an exemplary operation, when the fixing body moves towards the matching surface of the motor rotating shaft under the control of the fastening structure, the fixing surface and the matching surface can be tightly attached together, so that the motor rotating shaft is axially fixed, and the motor rotating shaft is prevented from sliding along the axial direction and rotating around the shaft. Corresponding to the above operation, when the fixing body moves in a direction away from the mating surface of the motor rotation shaft under the control of the fastening structure, the fixing surface and the mating surface are separated. In this operational scenario, the motor shaft can rotate normally and the fixture of the present invention can be used as part of an entire motor without disassembly from the motor. Based on the arrangement, the fixing device can play a role of sealing the end cover so as to prevent foreign matters such as external dust from entering the interior of the motor, thereby protecting the motor.

Fig. 2 is a block diagram illustrating a fixing device 200 according to an embodiment of the present invention. For a better understanding of the structure and function of the fixation device of the present invention, three figures, upper, middle and lower, are depicted in fig. 2. Wherein the top view is a front view of a fixation device according to an embodiment of the present invention. Which is an axial cross-sectional view of a fixation device according to an embodiment of the present invention. The following figure is a side view of a fixation device according to an embodiment of the present invention.

In one embodiment, the fixation device 200 of the present invention may include a fixation body 201, a fixation head 202, and a fastening structure. The fixing head is arranged at the first end of the fixing body, and the fixing head and the fixing body can be of an integral structure. The end of the fixing head remote from the fixing body is arranged with a fixing surface 203, which can be obtained by turning of a lathe. The shape of the fixing surface of the present invention may take various shapes, such as an inclined surface, an arc surface, or a spherical surface, according to the matching surface of the motor rotating shaft. Preferably, the fixing surface may have a spherical surface shape so as to more firmly fix the rotation shaft. In one embodiment, the second end of the stationary body, i.e. the other end of the stationary head, has a sealing surface 204 for sealing the end cap. Further, the sealing surface may be an annular flat surface for fastening with a side of the motor end cover close to the rotating shaft so as to seal the motor end cover. To enhance the sealing effect, an O-ring groove 205 may be arranged on the annular plane and an O-ring may be arranged in the aforementioned O-ring groove.

In another embodiment, the fixing body may further include a body fixedly coupled to a sealing surface side of the fixing head. Further, the body can be in various shapes such as a cylinder or a cuboid. In this scenario, the body may be mounted on the end cap in various forms such as a thread or a spring buckle, so that the fixing body may move along the axial direction of the motor under the control of the fastening structure. As shown in the middle view of fig. 2, the body is a cylinder (in this case, the fixing body may be referred to as a "fixing post"), and is integrally formed with the fixing head. The cylinder is connected with the annular plane of the fixing head and is provided with a concave groove at the joint so as to better protect the O-shaped ring.

As a specific embodiment, the fastening structure may include a first thread 206 disposed on the outer surface of the cylinder and a second thread disposed on the motor end cap. The first threads and the second threads are matched with each other, so that the fixing body moves along the direction of the motor rotating shaft, and the fixing surface is fastened with the matching surface of the motor rotating shaft. Specifically, a threaded hole is arranged in the center of the end cover, the hole center of the threaded hole coincides with the axis of the rotating shaft, and the second threads are arranged on the surface of the threaded hole. In operation, the cylinder is screwed into the threaded hole, and the first thread and the second thread are mutually matched, so that the cylinder moves along the threaded hole towards the direction of the motor rotating shaft.

In one embodiment, the fastening structure may further include a nut 207. The inner surface of the nut is arranged with a third thread that cooperates with the first thread to secure the motor end cap to the cylinder. Specifically, when the cylinder is rotated to enable the fixing surface to be fastened with the matching surface, the nut is fastened with the side surface, far away from the rotating shaft, of the end cover by rotating the nut, and therefore the phenomenon that the fixing surface is separated from the matching surface due to looseness of the cylinder is effectively prevented. On the other hand, when the cylinder is rotated to enable the annular plane of the fixing head to seal the end cover, the nut is fastened with the side face, far away from the rotating shaft, of the end cover by rotating the nut, and therefore the phenomenon that the annular plane is separated from the end cover due to looseness of the cylinder is effectively prevented.

In one embodiment, the first thread, the second thread and the third thread are explosion-proof threads meeting explosion-proof requirements respectively. The motor is frequently operated underground, and particularly operated in underground environments such as coal mines and the like which are easy to explode, so that the explosion-proof requirement on the motor is high. For the above reasons, when the thread is machined, the thread pitch of the first thread, the second thread and the third thread may be set to be greater than 0.7 mm in order to satisfy the explosion-proof requirement.

In another embodiment, the fastening structure may further include an outer hexagonal structure disposed at the second end of the fixing body, and the fixing body is moved in the direction of the first end or the second end by rotating the outer hexagonal structure. Specifically, when the motor shaft is fixed, the cylinder needs to be forcibly screwed down. Therefore, in order to apply a larger torsion to the cylinder, the other end of the cylinder may be turned by a lathe to form a structure with an outer hexagonal shape or other shapes.

Fig. 3 is a structural view showing a fitting relationship of a fixing device and a rotating shaft of a motor according to an embodiment of the present invention. It will be appreciated that fig. 3 primarily illustrates the application location of the fixing device of the invention in an electrical machine. When the fixing device is applied to the motor, the invention actually discloses the motor comprising the fixing device.

As shown in fig. 3, the fixing device of the present invention is mounted in the center of the motor end cover 301 through a first thread on the fixing column. A threaded hole is formed in the center of the end cover, and second threads are arranged in the threaded hole. Through right the one end of fixed column is rotatory for first screw thread and second screw thread are mutually supported, and then can remove the fixed column about. In one embodiment, a fixing surface may be disposed at an end of the fixing post close to the motor shaft 302 to cooperate with a mating surface of the motor shaft to fix the motor shaft. When the motor rotating shaft is processed, a center hole 303 is reserved on the rotating shaft head due to the reasons of processing, clamping and the like, and a matching surface is formed outside the center hole. The fixing surface and the matching surface are the same in shape and size, and when the fixing surface presses the matching surface, the rotating shaft cannot axially move and rotate around the shaft.

In one embodiment, the fixture of the present invention functions as a component of an electric machine, acting as a hermetic end cap. As shown in fig. 3, the motor may be provided with a device at the end cap for lubricating the bearing of the motor by oiling, and in order to prevent grease from leaking from the gap between the first thread and the second thread during oiling, the end cap needs to be ensured to be sealed. For this reason, a sealing surface of annular design is arranged on the fastening head of the fastening stud. When the fixed column moves leftwards until the annular sealing surface is tightly attached to one end of the end cover, the sealing operation of the end cover is realized. The working principle of the fixing device of the present invention is briefly described below.

When the motor needs to be transported, in order to prevent the motor bearing from being damaged by the rotation and axial back-and-forth movement of the motor rotating shaft in the transportation process, the motor rotating shaft needs to be fixed by the fixing device. Specifically, firstly, the outer hexagonal structure at the end part of the fixing column is rotated clockwise from the outside of the motor end cover through a wrench. At the moment, the fixing column moves towards the direction of the motor rotating shaft through the matching of the first threads and the second threads. And continuously rotating the fixing column until the fixing surface at one end of the fixing column props against the matching surface of the side surface of the motor rotating shaft. Then, the wrench is continuously screwed with force, so that the fixing surface and the mating surface are firmly pressed together. Then, the nut on the fixing column, which is positioned on the outer side of the end cover, is screwed down to be fastened on the outer side of the end cover so as to prevent the fixing column from loosening. Through the operation, the axial movement and the axial rotation of the motor rotating shaft are avoided, and the safety of the motor in the transportation process is ensured.

And before the motor is transported and is ready to be powered on for use, the wrench is used for rotating the outer hexagonal structure at the end part of the fixed column in the opposite direction, so that the fixed surface is separated from the matching surface. And continuing rotating the fixed column until the annular sealing surface on the fixed head is tightly attached to the inner side of the end cover. At this point, the O-ring seal on the annular flat surface effectively seals the end cap. And then, forcibly rotating the fixing column to ensure that the annular plane is tightly attached to the inner side of the end cover. Then, the nut on the fixing column, which is positioned on the outer side of the end cover, is screwed down to be fastened on the outer side of the end cover so as to prevent the fixing column from loosening. By doing so, the rotor of the motor can be rotated normally, and on the one hand, the end cap is sealed, thereby effectively preventing dust from entering the interior of the motor; on the other hand, the oil throwing and storing device is enabled to work normally.

It should be understood that the terms "first", "second", "third" and "fourth", etc. in the claims, the description and the drawings of the present invention are used for distinguishing different objects and are not used for describing a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and claims of this application, the singular form of "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the specification and claims of this specification refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.

Although the present invention is described in the above embodiments, the description is only for the convenience of understanding the present invention, and is not intended to limit the scope and application of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A fixture for a motor shaft, located on the motor end cap, comprising:

a stationary body having a first end and an oppositely directed second end, wherein the first end has a stationary surface for holding the motor shaft and the second end has a sealing surface for sealing the end cap; and

a fastening structure connected with the second end of the fixing body and used for moving the fixing body along the direction of the first end or the second end, wherein

When the fixing body moves along the direction of the first end, the fixing surface is attached to the matching surface on the motor rotating shaft; and is

When the fixing body is moved in the direction of the second end, to effect the sealing surface sealing against the end cap.

2. The fixing device according to claim 1, wherein the fixing body includes a fixing head having one end on which the fixing surface is disposed so as to fix the motor rotation shaft.

3. A mounting apparatus in accordance with claim 2 wherein the other end of the mounting head is provided with the sealing surface for engaging a side of a motor end cap adjacent the shaft to seal the end cap.

4. A fixture according to claim 3, wherein the sealing surface is annular planar and has an O-ring groove disposed thereon, and an O-ring is disposed within the O-ring groove.

5. The fixture according to claim 3, wherein the fixture body further comprises a body fixedly connected to a side of the sealing surface of the fixture head, and the fastening structure comprises a first thread disposed on the body and a second thread disposed on the motor end cap, the first thread and the second thread cooperating with each other such that the fixture body is moved in a direction of the first end or the second end to fasten the fixing surface to the mating surface of the motor shaft or seal the end cap.

6. The fixing device according to claim 5, wherein the second thread is disposed on a surface of a through hole penetrating the motor end cover in a direction of the rotation shaft, and the body penetrates the motor end cover through cooperation of the first thread and the second thread so that the fixing body moves in a direction of the first end or the second end.

7. The fixture according to claim 6, wherein the fastening structure further comprises a nut having a third thread disposed thereon, the third thread cooperating with the first thread to axially retain the fixture.

8. The fixation device of claim 1, wherein the fastening structure further comprises an outer hex configuration disposed at the second end of the fixation body, wherein rotating the outer hex configuration causes the fixation body to move in the direction of the first or second end.

9. The fixture according to claim 7, wherein the first, second and third threads are explosion proof threads that meet explosion proof requirements, respectively.

10. An electrical machine comprising a fixture according to any one of claims 1 to 9.