Permanent magnet synchronous motor end cover structure capable of improving sealing performance

Abstract

The invention discloses a permanent magnet synchronous motor end cover structure capable of improving sealing performance, relates to the technical field of permanent magnet synchronous motors, and aims to solve the problems that part of water molecules can enter the motor through a bearing outer cover and through holes of an end cover to cause corrosion and influence the service life of the motor when the permanent magnet motor runs for a long time in the background technology. According to the scheme, the bearing comprises a fixing ring arranged on the outer wall of a main shaft in a sleeving mode, the outer wall, close to the fixing ring, of the main shaft is sleeved with a bearing inner cover, first threaded holes distributed at equal intervals are formed in the outer wall of one side of the bearing inner cover, an end cover is arranged on one side of the bearing inner cover, and first threaded holes distributed at equal intervals are formed in the outer wall of one side of the end cover; first counter bores distributed at equal intervals are formed in the outer wall of one side of the end cover, and a bearing outer cover is arranged on one side of the main shaft. According to the invention, the overall quick disassembly can be realized, water molecules can be effectively prevented from entering the motor from the through holes of the bearing outer cover and the end cover, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet synchronous motors, and in particular to an end cover structure of a permanent magnet synchronous motor with improved sealing performance. Background Art

[0002] Permanent magnet synchronous motors use permanent magnets to provide excitation, which makes the motor structure simpler, reduces processing and assembly costs, and eliminates collector rings and brushes that are prone to problems, thereby improving the reliability of motor operation. Because no excitation current is required and there is no excitation loss, the efficiency and power density of the motor are improved. Permanent magnet synchronous motors are composed of components such as stators, rotors, and end covers. The stator is basically the same as an ordinary induction motor, and a laminated structure is used to reduce iron loss during motor operation. The rotor can be made solid or laminated. The armature winding can be a concentrated full-pitch winding, or a distributed short-pitch winding and an unconventional winding.

[0003] The motor end cover is an important motor protection component that isolates the motor from the outside. In some motors that use an air-water cooling structure, the waterproof requirements for the motor are becoming more and more stringent. The existing motor end cover structure consists of a bearing inner cover, an end cover and a bearing outer cover. A water channel needs to be opened on the inside of the end cover. The cooling water circulates in the end cover and the water jacket assembly to take the heat away from the motor components and thus reduce the temperature of the motor. When matched, through holes are left on the bearing outer cover and the end cover, and threaded holes are set on the bearing inner cover. The three are connected and fixed by the same set of bolts. Under long-term operation, some water molecules can enter the motor through the through holes of the bearing outer cover and the end cover to cause corrosion and affect the life of the motor. Summary of the invention

[0004] The present invention provides a permanent magnet synchronous motor end cover structure with improved sealing performance, which solves the problem in the prior art that when the permanent magnet motor runs for a long time, some water molecules can enter the motor through the through holes of the bearing outer cover and the end cover to cause corrosion and shorten the life of the motor.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A permanent magnet synchronous motor end cover structure with improved sealing performance comprises a fixing ring sleeved on the outer wall of a main shaft, a bearing inner cover sleeved on the outer wall of the main shaft close to the fixing ring, and first threaded holes distributed at equal distances are opened on the outer wall of one side of the bearing inner cover, an end cover is provided on one side of the bearing inner cover, first threaded holes distributed at equal distances are opened on the outer wall of one side of the end cover, and first countersunk holes distributed at equal distances are opened on the outer wall of one side of the end cover, a bearing outer cover is provided on one side of the main shaft, and second countersunk holes distributed at equal distances are opened on the outer wall of one side of the bearing outer cover, and a bearing isolator is sleeved on the outer wall of the main shaft close to the bearing outer cover.

[0007] Preferably, the fixing ring is sleeved on the inner wall of the bearing inner cover, and the fixing ring is connected to the outer wall of one side of the bearing inner cover by bolts.

[0008] Preferably, a retaining ring is sleeved on the outer wall of one end of the main shaft, and one side of the retaining ring abuts against the outer wall of one side of the bearing inner cover.

[0009] Preferably, one side of the end cover abuts against the outer wall of one side of the bearing inner cover, a plurality of the first countersunk holes are sleeved with first fastening bolts, and one end of a plurality of first fastening bolts are respectively screwed into the first threaded holes, a bearing is fixed on the outer wall of the main shaft, and the end cover is inserted into the outer wall of the bearing.

[0010] Preferably, an oil slinger is sleeved on the outer wall of one end of the main shaft, and one end of the oil slinger abuts against the outer wall of one side of the bearing.

[0011] Preferably, a retaining ring is clamped on the outer wall of one end of the main shaft, and one side of the retaining ring abuts against the outer wall of one side of the oil slinger.

[0012] Preferably, a second fastening bolt is sleeved in each of the second countersunk holes, and one end of each of the second fastening bolts is screwed into the second threaded hole respectively.

[0013] Preferably, a sealing ring is sleeved on the outer wall of one end of the main shaft, and a bearing isolator is inserted into the outer wall of the sealing ring, and the bearing isolator is sleeved on the outer wall of the main shaft.

[0014] The beneficial effects of the present invention are:

[0015] The bearing outer cover, end cover and bearing inner cover are made of steel. Under the condition of meeting the mechanical properties, a second countersunk hole and a second countersunk hole are respectively added to the bearing outer cover and the end cover, and a second threaded hole and a second threaded hole are respectively added to the end cover and the bearing inner cover. The second fastening bolt is inserted into the second countersunk hole and the second threaded hole to fasten the bearing outer cover and the end cover, and the first fastening bolt is inserted into the first countersunk hole and the first threaded hole to fasten the end cover and the bearing inner cover, which solves the problem of water molecules entering the interior of the motor. During disassembly, the second fastening bolt on the bearing outer cover is first removed to remove the bearing outer cover, and then the second fastening bolt on the end cover is removed to remove the end cover, and finally the bearing inner cover is removed, which achieves the effect of convenient disassembly and assembly, and can realize overall rapid disassembly. At the same time, it can effectively prevent water molecules from entering the interior of the motor from the through holes of the bearing outer cover and the end cover, thereby improving the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall front view of a permanent magnet synchronous motor end cover structure with improved sealing performance proposed by the present invention.

[0017] Figure 2The present invention provides a schematic diagram of the overall cross-sectional structure of a permanent magnet synchronous motor end cover structure with improved sealing performance.

[0018] Figure 3 This is a schematic diagram of the main structure of a fixing ring and a bearing inner cover of a permanent magnet synchronous motor end cover structure with improved sealing performance proposed by the present invention.

[0019] Figure 4 This is a schematic diagram of the main structure of an end cover of a permanent magnet synchronous motor end cover structure with improved sealing performance proposed by the present invention.

[0020] Figure 5 This is a schematic diagram of the main structure of a bearing outer cover of a permanent magnet synchronous motor end cover structure with improved sealing performance proposed by the present invention.

[0021] Figure 6 The present invention provides a schematic diagram of the side view of the bearing outer cover of a permanent magnet synchronous motor end cover structure with improved sealing performance.

[0022] In the figure: 1, main shaft; 2, fixing ring; 3, bearing inner cover; 31, first threaded hole; 4, retaining ring; 5, end cover; 51, second threaded hole; 52, first countersunk hole; 6, bearing; 7, oil throwing ring; 8, retaining ring; 9, bearing outer cover; 91, second countersunk hole; 10, sealing ring; 11, bearing isolator. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Example 1, reference Figure 1-6A permanent magnet synchronous motor end cover structure for improving sealing performance comprises a fixing ring 2 sleeved on the outer wall of a main shaft 1, a bearing inner cover 3 is sleeved on the outer wall of the main shaft 1 close to the fixing ring 2, and first threaded holes 31 distributed at equal distances are opened on one side outer wall of the bearing inner cover 3, the fixing ring 2 is sleeved on the inner wall of the bearing inner cover 3, the fixing ring 2 is connected to the outer wall of one side of the bearing inner cover 3 by bolts, a retaining ring 4 is sleeved on the outer wall of one end of the main shaft 1, one side of the retaining ring 4 abuts against the outer wall of one side of the bearing inner cover 3, an end cover 5 is provided on one side of the bearing inner cover 3, one side of the end cover 5 abuts against the outer wall of one side of the bearing inner cover 3, and first threaded holes 51 distributed at equal distances are opened on one side outer wall of the end cover 5, a plurality of first countersunk holes 52 are sleeved with first fastening bolts, one end of the plurality of first fastening bolts are respectively screwed into the first threaded holes 31, and the outer wall of one side of the end cover 5 is opened with equal distances. A first countersunk hole 52 is distributed at a certain distance, a bearing 6 is fixed on the outer wall of the main shaft 1, and the end cover 5 is inserted into the outer wall of the bearing 6. An oil slinger 7 is sleeved on the outer wall of one end of the main shaft 1, and one end of the oil slinger 7 abuts against the outer wall of one side of the bearing 6. A retaining ring 8 is clamped on the outer wall of one end of the main shaft 1, and one side of the retaining ring 8 abuts against the outer wall of one side of the oil slinger 7. A bearing outer cover 9 is provided on one side of the oil slinger 7. Second countersunk holes 91 distributed at equal distances are opened on the outer wall of one side of the bearing outer cover 9, and a plurality of second countersunk holes 91 are sleeved with second fastening bolts, and one ends of a plurality of second fastening bolts are respectively screwed into the second threaded holes 51. A sealing ring 10 is sleeved on the outer wall of one end of the main shaft 1, and a bearing isolator 11 is sleeved on the outer wall of the main shaft 1 close to the bearing outer cover 9. The bearing isolator 11 is inserted into the outer wall of the sealing ring 10, and the bearing isolator 11 is sleeved on the outer wall of the main shaft 1.

[0025] A second countersunk hole 91 is processed on the bearing outer cover 9, a first countersunk hole 52 and a second threaded hole 51 with staggered positions are processed on the end cover 5, and a first threaded hole 31 is processed on the bearing inner cover 3. The bearing inner cover 3 is first assembled on the main shaft 1, and then the end cover 5 is connected and fastened to the bearing inner cover 3 by the first fastening bolts, and the end cover 5 is assembled on the 6 bearings. The oil slinger 7 and the retaining ring 8 are respectively assembled on the main shaft 1, and the bearing outer cover 9 is connected and fastened to the end cover 5 by the second fastening bolts. Finally, the bearing isolator 11 is assembled.

[0026] 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.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A permanent magnet synchronous motor end cover structure with improved sealing performance, comprising a fixing ring (2) sleeved on the outer wall of a main shaft (1), characterized in that: A bearing inner cover (3) is sleeved on the outer wall of the main shaft (1) close to the fixing ring (2), and first threaded holes (31) are equidistantly distributed on the outer wall of one side of the bearing inner cover (3); An end cover (5) is provided on one side of the bearing inner cover (3); first threaded holes (51) are arranged at equal distances on an outer wall of one side of the end cover (5); and first countersunk holes (52) are arranged at equal distances on an outer wall of one side of the end cover (5); A bearing outer cover (9) is provided on one side of the main shaft (1), and second countersunk holes (91) are arranged at equal distances on the outer wall of one side of the bearing outer cover (9), and a bearing isolator (11) is sleeved on the outer wall of the main shaft (1) on the side close to the bearing outer cover (9).

2. A permanent magnet synchronous motor end cover structure with improved sealing performance according to claim 1, characterized in that: The fixing ring (2) is sleeved on the inner wall of the bearing inner cover (3), and the fixing ring (2) is connected to the outer wall of one side of the bearing inner cover (3) by means of bolts.

3. The permanent magnet synchronous motor end cover structure with improved sealing performance according to claim 1, characterized in that: A retaining ring (4) is sleeved on the outer wall of one end of the main shaft (1), and one side of the retaining ring (4) abuts against the outer wall of one side of the bearing inner cover (3).

4. The permanent magnet synchronous motor end cover structure with improved sealing performance according to claim 1, characterized in that: One side of the end cover (5) is in contact with the outer wall of one side of the bearing inner cover (3); a plurality of the first countersunk holes (52) are sleeved with first fastening bolts, and one end of the plurality of first fastening bolts is respectively screwed into the first threaded holes (31); a bearing (6) is fixedly provided on the outer wall of the main shaft (1), and the end cover (5) is plugged into the outer wall of the bearing (6).

5. The permanent magnet synchronous motor end cover structure with improved sealing performance according to claim 1, characterized in that: An oil slinger (7) is sleeved on the outer wall of one end of the main shaft (1), and one end of the oil slinger (7) abuts against the outer wall of one side of the bearing (6).

6. The permanent magnet synchronous motor end cover structure with improved sealing performance according to claim 5, characterized in that: A retaining ring (8) is clamped on the outer wall of one end of the main shaft (1), and one side of the retaining ring (8) abuts against the outer wall of one side of the oil slinger (7).

7. The permanent magnet synchronous motor end cover structure with improved sealing performance according to claim 5, characterized in that: A second fastening bolt is sleeved in each of the second countersunk holes (91), and one end of each of the second fastening bolts is screwed into the second threaded hole (51) respectively.

8. The permanent magnet synchronous motor end cover structure with improved sealing performance according to claim 1, characterized in that: A sealing ring (10) is sleeved on the outer wall of one end of the main shaft (1), and a bearing isolator (11) is inserted into the outer wall of the sealing ring (10), and the bearing isolator (11) is sleeved on the outer wall of the main shaft (1).

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