Spray-type cooling oil pipe for oil-cooled motor stator and cooling method of spray-type cooling oil pipe

Abstract

The invention discloses an oil-cooled motor stator spray-type cooling oil pipe and a cooling method thereof, and belongs to the technical field of motor cooling. The flat circular ring section is installed on the outer side of a stator welding end winding welding spot, the outer side wall is fixedly connected with one ends of the two straight pipe sections which are arranged in parallel, and the two straight pipe sections are located above the motor stator in the axial direction and installed on the inner side of a motor shell. The flat circular ring section and the two straight pipe sections are internally provided with communicated oil ducts, the end part of each straight pipe section is provided with an oil inlet, the side wall of each straight pipe section is provided with an oil hole I, the side wall of the flat circular ring section adjacent to the stator welding end winding is provided with a plurality of oil holes II, and the oil inlets, each oil hole I and each oil hole II are communicated with the oil ducts. A local hot area caused by non-uniform distribution of a traditional cooling medium is eliminated, and the reliability of the motor is improved; invalid bypass flow is avoided, pump power loss is reduced, and cooling efficiency is improved; an oil duct structure is optimized based on heat-flow coupling simulation, and it is ensured that a cooling system is deeply matched with the working condition of the motor.

Description

Technical Field

[0001] The invention relates to a spray-type cooling oil pipe for an oil-cooled motor stator and a cooling method thereof, belonging to the technical field of motor cooling. Background Art

[0002] The existing oil-cooled motor stator cooling system has the following technical defects:

[0003] 1. Structural defects in the stator winding cooling oil circuit design lead to uneven distribution of the cooling medium flow path. This uneven flow field distribution results in insufficient cooling medium flow in some winding areas, forming localized hot spots and causing an imbalance in the stator temperature field, seriously affecting the reliability and life of the motor.

[0004] 2. Existing cooling systems lack a dynamic flow control mechanism for the stator winding weld zone. Because welds, as critical nodes in the winding structure, have higher heat density, traditional static cooling designs cannot adjust the medium distribution ratio. This results in ineffective bypass flow of cooling medium in the weld zone, increasing pump power loss and reducing cooling efficiency.

[0005] 3. Traditional cooling system design relies primarily on empirical formulas and experimental verification, lacking precise thermal-fluid coupling simulation and optimization. This design paradigm makes it difficult to establish a quantitative mapping between cooling parameters and the motor's electromagnetic performance and temperature rise characteristics. This leads to a mismatch between the cooling system design and the motor's actual operating conditions, limiting the motor's peak power output and compromising energy efficiency due to insufficient or excessive cooling.

[0006] It is particularly important to note that in the emerging field of flat wire motors, their unique winding structure places higher demands on cooling systems. However, existing oil cooling solutions are still in the exploratory stage, lacking a systematic design theory. Available cooling solutions on the market rely primarily on experimental verification and lack quantitative design standards and standardized technical specifications based on multi-physics coupling analysis. This technological gap severely restricts the full realization of the high-performance advantages of flat wire motors and leads to unnecessary energy waste. Summary of the Invention

[0007] In order to solve the problems existing in the background technology, the present invention provides a spray-type cooling oil pipe for an oil-cooled motor stator and a cooling method thereof.

[0008] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a spray-type cooling oil pipe for an oil-cooled motor stator, comprising a straight pipe section and a flat circular ring section; the flat circular ring section is installed on the outside of the welding point of the stator welding end winding, and the outer wall of the flat circular ring section is fixedly connected to one end of two straight pipe sections arranged parallel to each other, and the two straight pipe sections are located axially above the motor stator and installed on the inner side of the motor housing; an oil passage is provided in communication with the interior of the flat circular ring section and the two straight pipe sections, an oil inlet is provided at the end of each straight pipe section, and an oil hole 1 corresponding to the stator welding end winding, the stator iron core and the stator crown end winding is provided on the side wall of each straight pipe section in sequence, and a plurality of oil holes 2 are provided on the side wall of the flat circular ring section adjacent to the stator welding end winding, and the oil inlet, each oil hole 1 and each oil hole 2 are all connected to the oil passage.

[0009] Each two corresponding oil holes of the two straight pipe sections are symmetrical and arranged at an angle.

[0010] A cooling method for a spray-type cooling oil pipe of an oil-cooled motor stator according to the present invention comprises the following steps:

[0011] S1: Cooling oil enters the oil channel through two oil inlets;

[0012] S2: Part of the cooling oil flows through the two straight pipe sections, and the other part flows through the flat ring section;

[0013] S3: The cooling oil in the two straight pipe sections flows out from oil hole 1, spraying and cooling the stator welding end winding, stator core, and stator crown end winding respectively;

[0014] S4: The cooling oil in the flat ring segment flows out from the second oil hole and is atomized to cool the welding points of the stator welding end winding.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention uses symmetrical and angled oil holes in the straight pipe section to allow the cooling oil beam to cover the stator core and the winding circumference, effectively eliminating local hot zones caused by uneven distribution of traditional cooling media and significantly improving the reliability of the motor; atomization spraying is achieved through the flat circular ring segment to accurately cool the high heat density areas of the winding welds, avoid ineffective bypass flow, reduce pump power loss, and improve cooling efficiency; the oil channel structure is optimized based on thermal-fluid coupling simulation, breaking through the limitations of traditional empirical design, ensuring deep matching of the cooling system with the motor operating conditions, and simultaneously improving peak power output and energy efficiency; for the special winding structure of the flat wire motor, a composite cooling strategy is used to fill the gaps in existing technologies and maximize its high performance advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 yes Figure 1 Rear view;

[0019] Figure 3 yes Figure 1 sectional view of

[0020] Figure 4 It is a reference diagram of the use state of the present invention;

[0021] Figure 5 yes Figure 4 The main view;

[0022] Figure 6 yes Figure 4 Exploded diagram. DETAILED DESCRIPTION

[0023] The technical solutions of the present invention will be clearly and completely described 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 invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] A spray-type cooling oil pipe for an oil-cooled motor stator comprises a straight pipe section 18 and a flat circular ring section 7; the flat circular ring section 7 is installed and fixed to the outside of the welding point of the stator welding end winding 14, and the outer wall of the flat circular ring section 7 is fixedly connected to one end of two straight pipe sections 18 arranged parallel to each other, and the two straight pipe sections 18 are located axially above the motor stator 8 and installed and fixed to the inner side of the motor housing 4; specifically: two straight pipe section mounting holes 2 are reserved on the inner wall of the motor housing 4, and the two straight pipe sections 18 are positioned with the motor housing 4 by positioning pier heads 11, and then the two straight pipe sections 18 are fixedly connected with the motor housing 4 by bolts respectively through corresponding mounting rods 1, and the flat circular ring section 7 is fixedly connected with the motor housing 4 by bolts through mounting rods 2 6.

[0025] The motor stator 8 is installed in the motor housing 4 and is positioned with multiple non-continuous stoppers on the motor housing 4. In the axial direction, the motor mounting ears 5 of the motor stator 8 are surface-to-surface matched with the motor mounting holes. The motor mounting holes are internally threaded and then tightened with bolts.

[0026] The stator core 15 is fixed to the motor housing 4 through the motor housing stop 3, and the motor whole machine position horizontal plane 9 shows the whole machine installation position of the motor.

[0027] An oil passage 17 is connected to the flat ring segment 7 and the two straight pipe segments 18. Each straight pipe segment 18 has an oil inlet 10 at its end. The sidewalls of each straight pipe segment 18 are sequentially provided with oil holes 1, corresponding to the stator welding end winding 14, the stator core 15, and the stator crown end winding 16, for spraying cooling oil. The sidewalls of the flat ring segment 7 adjacent to the stator welding end winding 14 are provided with a plurality of oil holes 2 arranged in a shower-like array. The oil holes 2 can be adjusted to any desired aperture size to ensure that the cooling oil sprayed from the oil holes 2 is atomized and sprayed onto the weld points of the motor welding end windings. The oil inlet 10, each oil hole 1, and each oil hole 2 are all connected to the oil passage 17.

[0028] Each of the two corresponding oil holes 1 of the two straight pipe sections 18 is symmetrical and angled, which can achieve spray coverage of different ranges of the motor core and the windings at both ends of the motor. Preferably, the cooling oil beams 12 sprayed from each of the two corresponding oil holes 1 are in an "eight" shape.

[0029] A cooling method for a spray-type cooling oil pipe of an oil-cooled motor stator according to the present invention comprises the following steps:

[0030] S1: Cooling oil enters the oil channel 17 through the two oil inlets 10;

[0031] S2: a portion of the cooling oil flows through the two straight pipe sections 18, and the other portion of the cooling oil flows through the flat ring section 7;

[0032] S3: The cooling oil in the two straight pipe sections 18 flows out from the oil hole 1, spraying and cooling the stator welding end winding 14, the stator core 15 and the stator crown end winding 16 respectively;

[0033] S4: The cooling oil in the flat ring segment 7 flows out from the second oil hole and is atomized to cool the welding points of the stator welding end winding 14.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0035] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A spray-type cooling oil pipe for an oil-cooled motor stator, characterized by: The invention comprises a straight pipe section (18) and a flat circular ring section (7); the flat circular ring section (7) is installed outside the welding point of the stator welding end winding (14); the outer wall of the flat circular ring section (7) is fixedly connected to one end of two straight pipe sections (18) arranged parallel to each other; the two straight pipe sections (18) are located axially above the motor stator (8) and are installed inside the motor housing (4); a connecting arrangement is provided between the flat circular ring section (7) and the two straight pipe sections (18). An oil passage (17) is provided, an oil inlet (10) is provided at the end of each straight pipe section (18), an oil hole 1 corresponding to the stator welding end winding (14), the stator iron core (15) and the stator crown end winding (16) is provided on the side wall of each straight pipe section (18) in sequence, a plurality of oil holes 2 are provided on the side wall of the flat ring section (7) adjacent to the stator welding end winding (14), and the oil inlet (10), each oil hole 1 and each oil hole 2 are all connected to the oil passage (17).

2. The spray-type cooling oil pipe for an oil-cooled motor stator according to claim 1, characterized in that: Each two corresponding oil holes of the two straight pipe sections (18) are symmetrical and arranged at an angle.

3. A cooling method for a spray-type cooling oil pipe of an oil-cooled motor stator according to claim 1 or 2, characterized in that: The method comprises the following steps: S1: Cooling oil enters the oil channel (17) through two oil inlets (10); S2: a portion of the cooling oil flows through the two straight pipe sections (18), and another portion of the cooling oil flows through the flat ring section (7); S3: The cooling oil in the two straight pipe sections (18) flows out from the oil hole 1, spraying and cooling the stator welding end winding (14), the stator core (15) and the stator crown end winding (16) respectively; S4: The cooling oil in the flat ring segment (7) flows out from the second oil hole and is atomized to cool the welding point of the stator welding end winding (14).

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