An interference fit high thermal conductivity collar assembly

Abstract

The utility model relates to motor heat dissipation technical field provides an interference fit high heat conduction sleeve ring subassembly, include: sleeve ring body, the inner hole of sleeve ring body is used for with cooling bellows interference fit, corrugated micro rib, corrugated micro rib is integrally formed on the inner hole wall surface of sleeve ring body, high heat conduction coating, high heat conduction coating is covered in the outer surface of sleeve ring body, the present application, through laser cladding graphene-silver composite high heat conduction coating on the sleeve ring outer surface, can realize the efficient heat coupling between motor base, cooperate corrugated micro rib and form corresponding, complex reinforced heat exchange runner, can strengthen the function of heat exchange, and the sleeve ring body made of forged aluminium 6063-T5 material can also withstand enough pipeline pressure, prevent pipeline from leaking when cooling, can make heat can be quickly, evenly taken away from heat source, improve the reliability and life of motor operation.

Description

Technical Field

[0001] This utility model relates to the field of motor heat dissipation technology, and in particular to an interference fit high thermal conductivity collar assembly. Background Technology

[0002] With the advancement of the "dual-carbon" strategy, large steam turbine generators, variable frequency motors, and high-speed permanent magnet motors are continuously developing towards higher power density, higher reliability, and higher efficiency. However, the increase in power density inevitably leads to an increase in heat loss per unit volume, resulting in significant heat peaks in key components such as the stator winding ends, rotor retaining rings, and bearing chambers. Effective thermal management has become a core bottleneck restricting the development of modern motor technology.

[0003] Currently, the industry's solutions to the aforementioned thermal problems mainly fall into two categories, but both have inherent flaws that are difficult to overcome:

[0004] Traditional air-cooling solutions are inefficient:

[0005] The widely adopted "fin-fan" forced air cooling solution relies on convective heat transfer through complex air ducts inside the motor. Due to uneven airflow distribution and the potential for localized airflow short-circuiting, its cooling efficiency is nearing its limit. Actual measurements show that this solution can lead to temperature differences of over 15°C between hot spots inside the motor. Such a large temperature gradient not only drastically accelerates the aging of insulation materials, severely impacting motor lifespan and operational reliability, but also fundamentally limits further increases in motor power density.

[0006] To overcome the limitations of air cooling, the current mainstream approach in the industry is to embed cooling water pipes (such as copper pipes) inside the motor. However, this solution has revealed a series of systemic pain points during implementation:

[0007] Due to limited installation space, cooling pipes are usually welded from multiple sections of pipe, resulting in numerous weld points. This not only leads to excessively high flow resistance, requiring a more powerful pumping system, but also poses a certain risk of leakage. Furthermore, the existing circular water pipes are mostly in line contact with the motor heat source (such as the iron core slot or retaining ring), resulting in a small effective contact area. Heat transfer from the heat source to the coolant must pass through multiple interfaces, resulting in huge contact thermal resistance and a large temperature difference in heat transfer. Utility Model Content

[0008] The purpose of this invention is to solve the problems in the existing technology where, due to limited installation space, cooling pipes are usually welded from multiple sections of pipe with numerous weld points. This not only leads to excessively high flow resistance, requiring a higher-power pumping system, but also poses a certain risk of leakage. Furthermore, the existing circular water pipes and the motor heat source (such as the iron core groove or retaining ring) are mostly in line contact, with a small effective contact area. Heat transfer from the heat source to the coolant must pass through multiple interfaces, resulting in huge contact thermal resistance and large temperature differences during heat transfer.

[0009] To achieve the above objectives, this utility model adopts the following technical solution: an interference fit high thermal conductivity collar assembly, comprising:

[0010] The collar body, the inner hole of which is used for interference fit with the cooling bellows;

[0011] Corrugated microribs are integrally formed on the inner wall surface of the collar body;

[0012] A high thermal conductivity coating is applied to the outer surface of the collar body;

[0013] Corrugated microribs and a high thermal conductivity coating allow heat to be carried away from the heat source quickly and evenly, improving the reliability and lifespan of the motor.

[0014] In a preferred embodiment, the collar body is provided with an inlet diverter cone to guide the fluid, uniformly distribute the coolant, and reduce flow resistance.

[0015] In a preferred embodiment, the outer peripheral wall of the end of the collar body is provided with a fixing ring, and the fixing ring has a plurality of evenly distributed connecting holes for connecting with the motor base.

[0016] In a preferred embodiment, the outer peripheral wall of the collar body is also provided with a plurality of guide connecting keys for guiding and positioning the installation of the collar body.

[0017] In a preferred embodiment, the high thermal conductivity coating is a graphene-silver composite coating formed by laser cladding.

[0018] In a preferred embodiment, the corrugated microribs have a three-dimensional corrugated shape and are uniformly distributed in rings on the inner wall of the collar body.

[0019] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0020] This invention achieves efficient thermal coupling between the collar and the motor frame by laser-coating a graphene-silver composite high thermal conductivity coating on the outer surface of the collar. Combined with corrugated microribs to form a corresponding complex enhanced heat exchange channel, the heat exchange function is enhanced. Furthermore, the collar body, made of forged aluminum 6063-T5, can withstand sufficient pipeline pressure to prevent pipeline leakage during cooling. This allows heat to be quickly and evenly removed from the heat source, improving the reliability and lifespan of the motor. Attached Figure Description

[0021] Figure 1 A three-dimensional structural schematic diagram of an interference fit high thermal conductivity collar assembly provided by this utility model;

[0022] Figure 2 An internal schematic diagram of an interference fit high thermal conductivity collar assembly provided by this utility model;

[0023] Figure 3 This utility model provides an interference fit high thermal conductivity collar assembly. Figure 1 Enlarged view of a portion of point A in the middle.

[0024] Legend:

[0025] 1. Collar body; 2. Three-dimensional corrugated microribs; 3. Diverter cone; 4. Fixing ring; 5. Connecting hole; 6. Guide connecting key; 7. High thermal conductivity coating. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-3 This embodiment provides an interference fit high thermal conductivity collar assembly, the specific idea of ​​which is as follows:

[0028] An interference fit high thermal conductivity collar assembly includes:

[0029] The collar body 1 has an inner hole for interference fit with the cooling bellows.

[0030] Corrugated microribs 2 are integrally formed on the inner wall of the collar body 1.

[0031] A high thermal conductivity coating 7 is applied to the outer surface of the collar body 1.

[0032] The material of the collar body 1 is forged aluminum 6063-T5, and the high thermal conductivity coating 7 is a graphene-silver composite coating formed on the outer surface of the collar body 1 by laser cladding process.

[0033] The collar body 1 serves as the main structural support and the primary heat conduction path. It is made of forged aluminum 6063-T5 material, which can withstand sufficient pipeline pressure and prevent pipeline leakage during cooling. The graphene-silver composite coating has excellent thermal conductivity, which can efficiently transfer the heat absorbed by the collar body 1 from the heat source to the overall outer surface, which can greatly reduce the contact thermal resistance between the collar and the motor interface.

[0034] When in use, a continuous seamless corrugated cooling main pipe is required, the length of which needs to cover the entire axial length of a single motor. The material should be high-strength TP304L or copper-nickel alloy, and it needs to meet the 2.5 MPa water pressure strength. It is used to fit inside the collar body 1. The inner diameter of the collar body 1 is slightly smaller than the outer diameter of the corrugated pipe to form an interference fit, ensuring that the two are in close contact after assembly and that the heat conduction is excellent. The outer contour of the collar body 1 matches the inner hole of the motor core slot or rotor retaining ring. The outer peripheral wall of the collar body 1 is also provided with multiple guide connecting keys 6 for guiding and positioning the installation of the collar body 1.

[0035] The inner hole of the collar is assembled at -80 ℃ with a 0.05 mm interference fit with the bellows to ensure a contact pressure ≥20 MPa and a thermal resistance ≤0.01 K·m² / W;

[0036] The collar body 1 has an inlet diversion cone 3 at its input; this is used to guide the fluid, uniformly distribute the coolant, and reduce flow resistance.

[0037] The three-dimensional corrugated microribs 2 have a three-dimensional corrugated shape and are uniformly distributed in rings on the inner wall of the collar body 1. When machining the collar body 1, a precision spinning tool is used to machine the corrugated microribs 2 on its inner hole wall. The corrugated microribs 2 have a three-dimensional corrugated shape and are uniformly distributed in rings on the inner wall of the collar body 1. After assembly, these microribs will be pressed into the outer wall of the bellows, thereby forming a corresponding and complex enhanced heat transfer channel on the inner wall of the cooling pipe. This channel has the function of disturbing the fluid, destroying the thermal boundary layer, and greatly enhancing heat transfer.

[0038] The outer peripheral wall of the end of the collar body 1 is provided with a fixing ring 4, and the fixing ring 4 is provided with a plurality of evenly distributed connecting holes 5.

[0039] A smooth hole that matches the connection hole 5 is pre-machined on the motor base. The collar assembly is inserted into the motor through this hole. At the interface, a combination seal of double O-rings (made of fluororubber) and metal C-rings is required to ensure excellent sealing performance after installation.

[0040] Working principle: Coolant (such as water-glycol solution) enters the bellows from the inlet split cone 3 and flows through the enhanced heat exchange channel shaped by the corrugated microribs 2. Strong eddies are generated through this channel, which destroys the thermal boundary layer. The heat generated by the rotor retaining ring is transferred to the inside of the retaining ring body 1 through the tightly fitted contact surface, and then conducted to the flowing coolant and carried away.

[0041] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0042] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An interference-fit high thermal conductivity collar assembly, comprising a continuous seamless corrugated cooling main pipe, the length of which needs to cover the entire axial length of a single motor, the material being high-strength TP304L or copper-nickel alloy, and needing to meet a water pressure strength of 2.5 MPa; characterized in that, Also includes: The inner hole of the collar body (1) is used for interference fit with the cooling bellows. Corrugated microribs (2) are integrally formed on the inner wall of the collar body (1); A high thermal conductivity coating (7) is applied to the outer surface of the collar body (1).

2. The interference fit high thermal conductivity collar assembly according to claim 1, characterized in that, The input of the collar body (1) is provided with an inlet diversion cone (3).

3. The interference fit high thermal conductivity collar assembly according to claim 2, characterized in that, The outer peripheral wall of the end of the collar body (1) is provided with a fixing ring (4), and the fixing ring (4) is provided with a plurality of evenly distributed connecting holes (5).

4. The interference fit high thermal conductivity collar assembly according to claim 1, characterized in that, The outer peripheral wall of the collar body (1) is also provided with multiple guide connecting keys (6).

5. The interference fit high thermal conductivity collar assembly according to claim 1, characterized in that, The high thermal conductivity coating (7) is a graphene-silver composite coating formed by laser cladding process.

6. The interference fit high thermal conductivity collar assembly according to claim 1, characterized in that, The corrugated microribs (2) have a three-dimensional corrugated shape and are evenly distributed in rings on the inner wall of the collar body (1).

Images