Bearing cooling structure and high-speed electric dynamometer motor

Abstract

This utility model discloses a bearing cooling structure and a high-speed electric dynamometer motor, belonging to the field of motor technology. The bearing cooling structure includes an end cover assembly, a housing, and a rotor. The end cover assembly includes an end cover, two bearings, and bearing spacers. The end cover is installed at one end of the housing. The two bearings are coaxially mounted at the center of the end cover, and the end of the rotor is inserted into the inner rings of the two bearings. A bearing spacer is sandwiched between the two bearings. The end cover has an oil inlet channel for receiving a heat-conducting medium. The oil inlet channel passes through and connects to the outer periphery of the bearing spacer. The bearing spacer has drainage holes that connect to the outer periphery of the bearing spacer and its opposite end faces. This utility model's bearing cooling structure and high-speed electric dynamometer motor can effectively solve the problem of large temperature differences in dual-bearing structures.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a bearing cooling structure and a high-speed electric dynamometer motor. Background Technology

[0002] High-speed electric dynamometer motors are mainly used in the field of mechanical engineering, especially in equipment for testing motor power output and efficiency. It is a type of motor that can be smoothly speed-regulated and is connected to the output shaft of the motor under test through electrical coupling technology, thereby realizing the testing of the performance of the motor under test.

[0003] Due to the high-speed rotation of the rotor, the bearings connecting the rotor of the existing high-speed electric dynamometer motor are prone to high temperature due to friction caused by high-speed motion, which affects the working performance. The existing bearing cooling structure for dual bearing structures usually adopts a series flow method in which the heat transfer medium passes through the two bearings sequentially. This cannot achieve an equivalent cooling effect for the two bearings, resulting in a temperature difference between the two bearings, which will affect the operational stability of the two bearings.

[0004] Therefore, it is necessary to provide a new bearing cooling structure and a high-speed electric dynamometer motor. Utility Model Content

[0005] Based on the aforementioned problems in the existing technology, the purpose of this utility model embodiment is to provide a bearing cooling structure and a high-speed electric dynamometer motor, which can effectively solve the problem of large temperature differences in dual-bearing structures.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a bearing cooling structure is provided, including an end cover assembly, a housing, and a rotor. The end cover assembly includes an end cover, two bearings, and a bearing spacer. The end cover is installed at one end of the housing. The two bearings are coaxially installed at the center of the end cover, and the end of the rotor is inserted into the inner ring of the two bearings. A bearing spacer is sandwiched between the two bearings. The end cover is provided with an oil inlet channel for receiving a heat transfer medium. The oil inlet channel passes through and connects to the outer periphery of the bearing spacer. The bearing spacer is provided with a drainage hole that connects to the outer periphery of the bearing spacer and the two opposite end faces of the bearing spacer.

[0007] Furthermore, the drainage hole extends radially along the bearing spacer, and an annular groove extending circumferentially along the outer periphery of the bearing spacer is recessed therein. The annular groove is aligned with and connected to the oil inlet channel. One end of the drainage hole near the outer periphery of the bearing spacer passes through and connects to the annular groove. One end face of the bearing spacer is provided with a guide hole one, and the other end face of the bearing spacer is provided with a guide hole two. Guide holes one and two extend axially along the bearing spacer, and one end of guide holes one and two near the drainage hole passes through and connects to the drainage hole.

[0008] Furthermore, an inner spacer is rotatably provided at the center of the bearing spacer, the end face of the bearing spacer abuts against the outer ring of the bearing, the end face of the inner spacer abuts against the inner ring of the bearing, and the end of the drainage hole near the inner circumference of the bearing spacer extends through to the inner circumference of the bearing spacer.

[0009] Furthermore, the portion between the housing and the end cover, and located outside the rotor, encloses and forms a first chamber. The end cover assembly also includes an oil seal cover, which covers and is connected to the end of the end cover away from the housing. The oil seal cover and the end cover enclose and form a second chamber. The end cover is provided with a communication port connecting the first chamber and the second chamber.

[0010] Furthermore, the end cover assembly also includes a first pressure ring, a second pressure ring, and a locking nut. The rotor is provided with a limiting shoulder that faces the end face of the bearing. The inner ring of the bearing closer to the rotor abuts against the limiting shoulder. The locking nut is threaded onto the rotor and abuts against the inner ring of the bearing farther from the rotor, so that the locking nut and the limiting shoulder push the inner rings of the two bearings toward the middle inner spacer. The first pressure ring is fixed to the end cover and presses against the outer ring of the bearing farther from the rotor. The second pressure ring is fixed to the end cover and presses against the outer ring of the bearing closer to the rotor, so that the outer rings of the two bearings push toward the middle bearing spacer.

[0011] Furthermore, the bearing spacer is provided with multiple drainage holes, which are distributed in an array around the axis of the bearing spacer.

[0012] Furthermore, the housing is provided with an oil outlet, which communicates with the first chamber, and the oil outlet is located at the lowest position inside the housing cavity.

[0013] Furthermore, a base is installed at the bottom of the housing, and the interior of the base is hollow to form a liquid storage chamber, which is connected to the oil outlet.

[0014] Furthermore, an end cap assembly is installed at each of the opposite ends of the housing.

[0015] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a high-speed electric dynamometer motor, wherein the high-speed electric dynamometer motor includes the bearing cooling structure provided by any of the above solutions.

[0016] The beneficial effects of this utility model are as follows: This utility model provides a bearing cooling structure and a high-speed electric dynamometer motor. The bearing cooling structure includes an end cover assembly, a housing, and a rotor. The end cover assembly includes an end cover, two bearings, and a bearing spacer. The end cover is installed at one end of the housing. The two bearings are coaxially installed at the center of the end cover, and the end of the rotor is inserted into the inner ring of the two bearings. A bearing spacer is sandwiched between the two bearings. The end cover has an oil inlet channel for receiving a heat transfer medium. The oil inlet channel passes through and connects to the outer periphery of the bearing spacer. The bearing spacer has a drainage hole that connects to the outer periphery of the bearing spacer and the opposite end faces of the bearing spacer. In this way, the heat transfer medium received by the oil inlet channel can flow along the drainage hole of the bearing spacer to the opposite end faces of the bearing spacer and simultaneously flow through the two bearings. Since the heat transfer medium entering the two bearings comes from the same source, it forms a parallel flow pattern, and the two bearings will receive the same heat transfer effect. Compared with the prior art, which uses a series connection of heat transfer medium through two bearings, this effectively solves the problem of large temperature differences in the dual-bearing structure. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a cross-sectional view of the bearing cooling structure provided in an embodiment of the present invention.

[0019] Figure 2 for Figure 1 An enlarged schematic diagram of region A in the middle.

[0020] Figure 3 This is a schematic diagram showing the positional relationship between the end cap assembly and the rotor provided in an embodiment of the present invention.

[0021] Figure 4 for Figure 3 An exploded view of the structure shown.

[0022] Figure 5 A cross-sectional view of the end cap assembly provided in an embodiment of this utility model.

[0023] Figure 6 A three-dimensional structural diagram of the bearing spacer provided in an embodiment of this utility model.

[0024] Figure 7 A cross-sectional view of the bearing spacer provided in an embodiment of this utility model.

[0025] The reference numerals in the figures are as follows: 1. End cover assembly; 11. End cover; 111. Oil inlet channel; 112. Connecting port; 12. Bearing; 13. Bearing spacer; 131. Inner spacer; 132. Annular groove; 133. Drain hole; 134. Guide hole one; 135. Guide hole two; 136. Spacer gap; 14. Oil seal cover; 15. Pressure ring one; 16. Pressure ring two; 17. Second chamber; 18. Locking nut; 2. Housing; 3. Rotor; 31. Limiting shoulder; 4. First chamber; 5. Base; 6. Oil outlet. Detailed Implementation

[0026] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] It should be noted that when a component is referred to as "connected to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Throughout this specification, reference to "an embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this application. Therefore, the phrases "in one embodiment," "in some embodiments," or "in some of these embodiments" appear in various places throughout the specification, and not all refer to the same embodiment. Furthermore, in one or more embodiments, a particular feature, structure, or characteristic may be combined in any suitable manner.

[0031] Please refer to Figures 1 to 7 As shown, a bearing cooling structure provided by this utility model will now be described. This bearing cooling structure includes an end cover assembly 1, a housing 2, and a rotor 3. The end cover assembly 1 includes an end cover 11, two bearings 12, and a bearing spacer 13. The end cover 11 is installed at one end of the housing 2. The two bearings 12 are coaxially installed at the center of the end cover 11, and the end of the rotor 3 is inserted into the inner rings of the two bearings 12. A bearing spacer 13 is sandwiched between the two bearings 12. The end cover 11 has an oil inlet channel 111 for receiving a heat transfer medium. The oil inlet channel 111 extends through and connects to the outer periphery of the bearing spacer 13. On the side, the bearing spacer 13 is provided with a drainage hole 133, which connects to the outer circumference of the bearing spacer 13 and the opposite two end faces of the bearing spacer 13. In this way, the heat transfer medium entering the oil inlet channel 111 can flow along the drainage hole 133 of the bearing spacer 13 to the opposite two end faces of the bearing spacer 13, and simultaneously flow through the two bearings 12. Since the heat transfer medium entering the two bearings 12 comes from the same stream, it forms a parallel flow mode, and the two bearings 12 will receive the same heat transfer effect. Compared with the existing technology of heat transfer medium passing through two bearings in series, this effectively solves the problem of large temperature difference in the dual bearing structure.

[0032] like Figure 2 As shown, in some embodiments, the bearing 12 is a radial bearing to withstand the radial load between the rotor 3 and the end cover 11, providing low frictional resistance for the rotation of the rotor 3.

[0033] like Figure 6 and Figure 7As shown, in some embodiments, the drainage hole 133 extends radially along the bearing spacer 13, and the outer circumferential side of the bearing spacer 13 is recessed with an annular groove 132 extending circumferentially along the bearing spacer 13. The annular groove 132 is aligned with and communicates with the oil inlet channel 111. One end of the drainage hole 133 near the outer circumferential side of the bearing spacer 13 passes through and communicates with the annular groove 132. One end face of the bearing spacer 13 is provided with a guide hole 134, and the other end face of the bearing spacer 13 is provided with a guide hole 135. The first guide hole 134 and the second guide hole 135 extend along the axial direction of the bearing spacer 13. The ends of the first guide hole 134 and the second guide hole 135 near the drain hole 133 pass through and connect to the drain hole 133, thereby realizing that the drain hole 133 connects to the outer peripheral side of the bearing spacer 13 and the opposite two end faces of the bearing spacer 13. The heat transfer medium output from the drain hole 133 can be simultaneously drawn out from the first guide hole 134 and the second guide hole 135 and flow to the two bearings 12 respectively.

[0034] like Figure 6 and Figure 7 As shown, in some embodiments, an inner spacer 131 is rotatably provided at the center of the bearing spacer 13. The end face of the bearing spacer 13 abuts against the outer ring of the bearing 12, and the end face of the inner spacer 131 abuts against the inner ring of the bearing 12. Thus, the distance between the two bearings 12 is limited by the bearing spacer 13 and the inner spacer 131, which facilitates the installation of the two bearings 12. The end of the drain hole 133 near the inner circumference of the bearing spacer 13 extends to the inner circumference of the bearing spacer 13, so that the heat-conducting medium in the drain hole 133 can enter the spacer gap 136 between the bearing spacer 13 and the inner spacer 131. This can achieve a cooling effect on the rotational gap between the bearing spacer 13 and the inner spacer 131.

[0035] like Figure 7 As shown, in some embodiments, the bearing spacer 13 is provided with a plurality of drainage holes 133, which are distributed in an array around the axis of the bearing spacer 13.

[0036] like Figure 2As shown, in some embodiments, the portion between the housing 2 and the end cover 11, and outside the rotor 3, encloses a first chamber 4. The end cover assembly 1 also includes an oil seal cover 14, which covers and connects to the end of the end cover 11 away from the housing 2, so that the oil seal cover 14 and the end cover 11 enclose a second chamber 17. The end cover 11 is provided with a communication port 112 connecting the first chamber 4 and the second chamber 17. In this way, when the heat transfer medium flows through the first guide hole 134 and passes the bearing 12 near the first chamber 4, the heat transfer medium enters the first chamber 4. When the heat transfer medium flows through the second guide hole 135 and passes the bearing 12 near the second chamber 17, the heat transfer medium enters the second chamber 17 and then enters the first chamber 4 and converges. In this way, the heat transfer medium flowing through the two bearings 12 will not cross between the two bearings 12, thus preventing heat transfer media of different temperatures from contacting the two bearings 12.

[0037] like Figure 2 and Figure 4 As shown, in some embodiments, the end cover assembly 1 further includes a first pressure ring 15, a second pressure ring 16, and a locking nut 18. The rotor 3 is provided with a limiting shoulder 31 that faces the end face of the bearing 12. The inner ring of the bearing 12 near the rotor 3 abuts against the limiting shoulder 31. The locking nut 18 is threaded onto the rotor 3 and abuts against the inner ring of the bearing 12 away from the rotor 3. In this way, the locking nut 18 and the limiting shoulder 31 can push the inner rings of the two bearings 12 toward the middle inner spacer 131, ensuring that the two bearings 12 are installed in place relative to the rotor 3. In addition, the first pressure ring 15 is fixed to the end cover 11 and the first pressure ring 15 is pressed against the outer ring of the bearing 12 away from the rotor 3. The second pressure ring 16 is fixed to the end cover 11 and the second pressure ring 16 is pressed against the outer ring of the bearing 12 near the rotor 3, so that the outer rings of the two bearings 12 are pushed toward the middle bearing spacer 13, to ensure that the two bearings 12 are installed in place relative to the end cover 11.

[0038] like Figure 2 As shown, in some embodiments, the housing 2 is provided with an oil outlet 6, which communicates with the first chamber 4, and the oil outlet 6 is located at the lowest position of the inner cavity of the housing 2.

[0039] like Figure 2 As shown, in some embodiments, an end cap assembly 1 is respectively installed at opposite ends of the housing 2.

[0040] like Figure 2 As shown, in some embodiments, a base 5 is installed at the bottom of the housing 2. The base 5 is hollow to form a liquid storage cavity, which is connected to the oil outlet 6, so that the heat transfer medium can flow from the oil outlet 6 under the action of gravity and converge into the liquid storage cavity of the base 5.

[0041] It is understandable that when the heat transfer medium is made of a material with lubricating properties, it can also provide rolling lubrication for the bearing 12.

[0042] This utility model embodiment also provides a high-speed electric dynamometer motor, which includes the bearing cooling structure provided in any of the above embodiments.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bearing cooling structure characterized by: The device includes an end cover assembly, a housing, and a rotor. The end cover assembly includes an end cover, two bearings, and bearing spacers. The end cover is installed at one end of the housing. The two bearings are coaxially installed at the center of the end cover, and the end of the rotor is inserted into the inner rings of the two bearings. A bearing spacer is sandwiched between the two bearings. The end cover has an oil inlet channel for receiving a heat transfer medium. The oil inlet channel passes through and connects to the outer periphery of the bearing spacer. The bearing spacer has drainage holes that connect to the outer periphery of the bearing spacer and the two opposite end faces of the bearing spacer.

2. The bearing cooling structure according to claim 1, characterized by: The drain hole extends radially along the bearing spacer. The outer circumference of the bearing spacer is recessed with an annular groove extending circumferentially along the bearing spacer. The annular groove is aligned with and connected to the oil inlet channel. One end of the drain hole near the outer circumference of the bearing spacer passes through and connects to the annular groove. One end face of the bearing spacer is provided with a guide hole one, and the other end face of the bearing spacer is provided with a guide hole two. The guide holes one and two extend axially along the bearing spacer. The ends of the guide holes one and two near the drain hole pass through and connect to the drain hole.

3. The bearing cooling structure according to claim 1, characterized by: The bearing spacer is rotatably provided with an inner spacer at its center. The end face of the bearing spacer abuts against the outer ring of the bearing, and the end face of the inner spacer abuts against the inner ring of the bearing. The drain hole extends through to the inner circumference of the bearing spacer.

4. The bearing cooling structure according to claim 1, characterized by: The portion between the housing and the end cover, and outside the rotor, encloses and forms a first chamber. The end cover assembly also includes an oil seal cover, which covers and is connected to the end of the end cover away from the housing. The oil seal cover and the end cover enclose and form a second chamber. The end cover has a communication port connecting the first chamber and the second chamber.

5. The bearing cooling structure according to claim 3, characterized by: The end cover assembly also includes a first pressure ring, a second pressure ring, and a locking nut. The rotor is provided with a limiting shoulder that faces the end face of the bearing. The inner ring of the bearing closer to the rotor abuts against the limiting shoulder. The locking nut is threaded onto the rotor and abuts against the inner ring of the bearing farther from the rotor, so that the locking nut and the limiting shoulder push the inner rings of the two bearings toward the middle inner spacer. The first pressure ring is fixed to the end cover and presses against the outer ring of the bearing farther from the rotor. The second pressure ring is fixed to the end cover and presses against the outer ring of the bearing closer to the rotor, so that the outer rings of the two bearings push toward the middle bearing spacer.

6. The bearing cooling structure according to claim 1, characterized by: The bearing spacer is provided with multiple drainage holes, which are arranged in an array around the axis of the bearing spacer.

7. The bearing cooling structure according to claim 4, characterized by: The housing is provided with an oil outlet, which is connected to the first chamber, and the oil outlet is located at the lowest position inside the housing.

8. The bearing cooling structure according to claim 7, characterized by: The bottom of the housing is equipped with a base, and the interior of the base is hollow to form a liquid storage chamber, which is connected to the oil outlet.

9. The bearing cooling structure according to any one of claims 1 to 8, characterized by: An end cap assembly is installed at each of the opposite ends of the housing.

10. A high-speed electric dynamometer motor, characterized by: The high-speed electric dynamometer motor includes the bearing cooling structure as described in any one of claims 1 to 9.

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