A wet motor bearing cooling structure

Abstract

The invention discloses a wet motor bearing cooling structure, comprising a motor, motor end covers are installed at both ends of the motor, a motor cavity is arranged inside the motor, a main shaft is installed at the motor cavity, both ends of the main shaft are rotatably connected with the shaft hole of the motor end cover through a sliding bearing, a liquid guide groove with a spiral structure is arranged between the inner wall of the sliding bearing and the outer wall of the main shaft, an end gap is arranged at the inner wall of the sliding bearing close to the motor end cover, and a liquid return channel is arranged between the inner wall of the motor end cover and the outer wall of the sliding bearing. The liquid guide groove and the liquid return channel of the wet motor bearing cooling structure enable the cooling liquid to directly pass through the inner and outer rings of the sliding bearing when the sliding bearing is working, and can fully cool the inner and outer rings of the bearing, so that the inner and outer rings of the sliding bearing form a cooling circuit, so that the service life of the sliding bearing is increased, and the problem that the existing liquid guide groove can only directly cool the inner ring of the sliding bearing but cannot directly cool the outer ring of the sliding bearing, that is, insufficient cooling, is solved.

Description

Technical Field

[0001] The invention relates to the technical field of motor cooling equipment, and in particular to a wet motor bearing cooling structure. Background Art

[0002] Sliding bearings have a larger friction coefficient than rolling bearings, and the loss caused by frictional heat is larger, which is often not ignored during use. Existing sliding bearings only have liquid guide grooves, and no circulating cooling circuit is formed, which easily leads to local heating, causing the service life of the bearing to be greatly shortened. Although some sliding bearings have liquid outlets in the bearing chamber, the cooling liquid can only pass through the inner ring of the bearing and then flow out from the liquid outlet, that is, it can only directly cool the inner ring of the bearing, and the cooling effect is not ideal. Summary of the invention

[0003] The object of the present invention is to provide a wet motor bearing cooling structure to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides a wet motor bearing cooling structure, including a motor, motor end covers are installed at both ends of the motor, a motor cavity is arranged inside the motor, a main shaft is installed at the part of the motor cavity, both ends of the main shaft are rotatably connected with the axial hole of the motor end cover through a sliding bearing, a liquid guide groove with a spiral structure is arranged between the inner wall of the sliding bearing and the outer wall of the main shaft, an end gap is arranged at the inner wall of the sliding bearing near the motor end cover, a liquid return channel is arranged between the inner wall of the motor end cover and the outer wall of the sliding bearing, one end of the liquid return channel is connected with the motor cavity, the other end of the liquid return channel is connected with the end gap, one end of the liquid guide groove is connected with the end gap, a coolant is arranged in the motor cavity, the coolant can rotate in the liquid guide groove along with the rotor of the motor, and due to the action of centrifugal force, a pressure difference is generated at both ends of the coolant in the liquid guide groove, so that it can flow from one end to the other end.

[0005] Preferably, the motor end cover is fixed to both ends of the motor by bolts.

[0006] Preferably, a sealing groove is provided in the middle portion of the outer side of the motor end cover, and a sealing ring is provided in the sealing groove.

[0007] Preferably, the inner wall of the cross-section of the liquid-conducting groove is a semicircular structure.

[0008] Preferably, the liquid return channel is arranged on the inner wall of the shaft hole of the motor end cover and is arranged in a circular shape with equal intervals. The cross-sectional diameter of the liquid return channel is a semicircular structure.

[0009] Preferably, the liquid return channels are arranged on the outer wall of the sliding bearing and are arranged in a circular shape with equal intervals. The cross-sectional diameter of the liquid return channels is a semicircular structure.

[0010] Preferably, the liquid guiding groove is provided on the outer wall of the main shaft or the inner wall of the sliding bearing.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] In the wet motor bearing cooling structure, the liquid guide groove and the liquid return channel are arranged therein, so that the cooling liquid can directly pass through the inner and outer rings of the sliding bearing when the sliding bearing is working, so that the inner and outer rings of the bearing can be fully cooled, and the inner and outer rings of the sliding bearing form a cooling circuit, so that the service life of the sliding bearing is increased, and the problem that the existing liquid guide groove can only directly cool the inner ring of the sliding bearing but cannot directly cool the outer ring of the sliding bearing, that is, insufficient cooling, is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0014] Figure 2 It is a schematic diagram of the internal structure of the sliding bearing in the present invention.

[0015] The meaning of each number in the figure is:

[0016] 1. Motor; 11. Motor cavity; 12. Motor end cover; 2. Main shaft; 3. Sliding bearing; 4. Liquid guide groove; 5. End gap; 6. Liquid return channel; 7. Sealing ring. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] Example 1

[0020] The present invention provides a wet motor bearing cooling structure, such as Figure 1-Figure 2 As shown, it includes a motor 1, a motor end cover 12 is installed at both ends of the motor 1, a motor cavity 11 is arranged inside the motor 1, a main shaft 2 is installed at the part of the motor cavity 11, and the two ends of the main shaft 2 are rotatably connected with the shaft hole of the motor end cover 12 through a sliding bearing 3, a spiral structured liquid guide groove 4 is arranged between the inner wall of the sliding bearing 3 and the outer wall of the main shaft 2, an end gap 5 is arranged at the inner wall of the sliding bearing 3 near the motor end cover 12, a liquid return channel 6 is arranged between the inner wall of the motor end cover 12 and the outer wall of the sliding bearing 3, and the liquid guide groove 4 and the end gap 5 are arranged. Together with the return liquid channel 6, a cooling circuit is formed. The coolant circulates inside to cool the sliding bearing 3. One end of the return liquid channel 6 is connected to the motor cavity 11, and the other end of the return liquid channel 6 is connected to the end gap 5. One end of the liquid guide groove 4 is connected to the end gap 5. Coolant is arranged in the motor cavity 11. The coolant can rotate in the liquid guide groove 4 along with the rotor of the motor 1. Due to the action of centrifugal force, a pressure difference is generated at both ends of the coolant in the liquid guide groove 4, so that it can flow from one end to the other end, thereby ensuring the circulation of the coolant.

[0021] In this embodiment, the motor end cover 12 is fixed to both ends of the motor 1 by bolts, so that the installation and removal of the motor end cover 12 are convenient.

[0022] Specifically, a sealing groove is provided in the middle of the outer side of the motor end cover 12 , and a sealing ring 7 is arranged in the sealing groove to ensure the sealing between the outer end of the main shaft 2 and the motor end cover 12 .

[0023] Furthermore, the inner wall of the cross section of the liquid-conducting groove 4 is a semicircular structure, and the inner wall is smooth, thereby ensuring the stable flow of the liquid.

[0024] Furthermore, the liquid return channel 6 is arranged on the inner wall of the shaft hole of the motor end cover 12 and is arranged in a circular shape with equal spacing. The cross-sectional diameter of the liquid return channel 6 is a semicircular structure to ensure uniform flow of the coolant.

[0025] Example 2

[0026] In order to further facilitate the disassembly and cleaning of the cooling circuit, the return liquid channel 6 is arranged on the outer wall of the sliding bearing 3 and is arranged in a ring-shaped and equidistant manner. The cross-sectional diameter of the return liquid channel 6 is a semicircular structure. When cleaning is required, the sliding bearing 3 is removed and the return liquid channel 6 is cleaned.

[0027] Furthermore, the liquid guiding groove 4 is provided on the outer wall of the main shaft 2 or the inner wall of the sliding bearing 3 and is arranged according to requirements.

[0028] When the wet motor bearing cooling structure of the present invention is used, the coolant is first introduced into the motor cavity 11, and the coolant flows into the liquid guide groove 4. When the motor 1 is working, the coolant rotates with the rotor in the liquid guide groove 4. Due to the effect of centrifugal force, the coolant in the liquid guide groove 4 generates a pressure difference, passes through the end gap 5 of the sliding bearing 3, flows through the return liquid channel 6 of the outer ring of the sliding bearing 3, and finally reaches the external motor cavity 11, thereby forming a cooling circuit that directly cools the inner and outer rings of the sliding bearing 3 in turn. The cooling liquid can directly pass through the inner and outer ring surfaces of the sliding bearing 3, thereby fully cooling the inner and outer sides of the sliding bearing 3, thereby increasing the bearing life.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wet motor bearing cooling structure, comprising a motor (1), characterized in that: Motor end covers (12) are installed at both ends of the motor (1), a motor cavity (11) is provided inside the motor (1), a main shaft (2) is installed at the bottom of the motor cavity (11), the two ends of the main shaft (2) are rotatably connected to the shaft hole of the motor end cover (12) through a sliding bearing (3), a liquid guide groove (4) with a spiral structure is provided between the inner wall of the sliding bearing (3) and the outer wall of the main shaft (2), an end gap (5) is provided at the inner wall of the sliding bearing (3) close to the motor end cover (12), a liquid return channel (6) is provided between the inner wall of the motor end cover (12) and the outer wall of the sliding bearing (3), one end of the liquid return channel (6) is connected to the motor cavity (11), the other end of the liquid return channel (6) is connected to the end gap (5), one end of the liquid guide groove (4) is connected to the end gap (5), and a coolant is provided in the motor cavity (11). The coolant can rotate in the liquid guide groove (4) along with the rotor of the motor (1). Due to the effect of centrifugal force, a pressure difference is generated at both ends of the coolant in the liquid guide groove (4), so that the coolant can flow from one end to the other end. The motor end cover (12) is fixed to the two ends of the motor (1) by bolts. A sealing groove is provided in the middle of the outer side of the motor end cover (12). A sealing ring (7) is provided in the sealing groove. The inner wall of the cross section of the liquid guide groove (4) is a semicircular structure. The liquid return channel (6) is arranged on the inner wall of the shaft hole of the motor end cover (12) and is arranged in an annular manner with equal spacing. The cross-sectional diameter of the liquid return channel (6) is a semicircular structure. The liquid return channel (6) is arranged on the outer wall of the sliding bearing (3) and is arranged in an annular manner with equal spacing. The cross-sectional diameter of the liquid return channel (6) is a semicircular structure. The liquid guide groove (4) is provided on the outer wall of the main shaft (2) or on the inner wall of the sliding bearing (3).

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