Anti-explosion motor based on helical flow channel and atomization cooling function

Abstract

The application discloses a kind of based on helical flow channel and atomization cooling function's explosion-proof motor, including shell and rotor, stator;Shell includes front end cover, shell and rear end cover;Rotor includes rotor core and rotating shaft;Stator includes stator coil and stator core, and a group of helical ribs are equipped on stator core, and helical flow channel is formed between adjacent helical ribs;The top of helical rib is formed with interference fit with the inner wall of shell;Rotating shaft is equipped with inner circulating centrifugal fan and inner circulating axial flow fan;The rear end of shell is equipped with fairing, and the rear end of rotating shaft is equipped with outer air path fan;Atomization device is equipped at the entrance of fairing.The based on helical flow channel and atomization cooling function's explosion-proof motor of the application, by adopting specific structure design, so that inner air path system and outer air path system form collaborative cooling structure, wherein inner air path is strengthened internal heat exchange by helical flow, and outer air path is strengthened external heat exchange by gas-liquid two-phase flow, and the overall efficient heat dissipation of motor is realized.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and specifically to an explosion-proof motor based on a spiral flow channel and atomized cooling function. Background Technology

[0002] In hazardous environments such as petrochemical plants, coal mines, and grain and oil processing plants where explosive gases or dust are present, explosion-proof motors, as core power equipment, directly impact the stability of production systems and the safety of personnel. During motor operation, components such as windings and bearings generate significant heat due to electromagnetic losses and mechanical friction. If this heat cannot be dissipated in time, it can lead to decreased motor efficiency, accelerated insulation aging, and, more importantly, an explosion if the surface temperature exceeds the ignition threshold of flammable media. Therefore, an efficient and reliable cooling system is one of the core design considerations for explosion-proof motors.

[0003] Existing cooling methods for explosion-proof motors mainly include natural cooling, forced air cooling, and liquid cooling. Forced air cooling, in particular, achieves convective heat transfer by installing airflow paths inside or outside the motor, allowing air to flow through the motor housing or internal structure. However, existing technologies still have the following shortcomings:

[0004] (1) In terms of internal airflow, traditional motors have a straight-through structure, with a short airflow path and a simple flow organization form, which easily forms local low-speed zones or stagnant zones, resulting in insufficient heat exchange between the airflow and the motor housing, low heat exchange area utilization, and limiting the improvement of heat dissipation performance.

[0005] (2) Regarding the external airflow path, existing forced air cooling mainly relies on single-air-convection heat exchange, and its heat exchange capacity is limited by the thermal properties of the air, resulting in a low heat exchange capacity per unit volume. Under high power density or high load conditions, relying solely on air convection is insufficient to meet the heat dissipation requirements; in addition, the airflow stays in the external airflow path for a short time, resulting in insufficient heat exchange with the shell surface, which further reduces the heat dissipation efficiency.

[0006] (3) Although traditional liquid cooling systems have high heat exchange capacity, they usually require a closed liquid circulation loop, including water jacket, pipeline and pump structures, which are complex, costly and have leakage risks, making them unsuitable for applications with limited space or high reliability requirements.

[0007] In summary, existing explosion-proof motor cooling technologies suffer from insufficient heat dissipation efficiency and complex structures. Therefore, it is necessary to develop a motor cooling structure that can simultaneously enhance the heat exchange capacity of both internal and external airflow paths to improve airflow organization and heat exchange efficiency, thereby achieving efficient and stable motor heat dissipation. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this application provides an explosion-proof motor based on a spiral flow channel and atomized cooling function. This explosion-proof motor, based on a spiral flow channel and atomized cooling function, employs a specific structural design to create a synergistic cooling structure between the internal and external airflow systems. The internal airflow enhances internal heat exchange through spiral flow, while the external airflow enhances external heat exchange through gas-liquid two-phase flow, jointly achieving efficient overall heat dissipation for the motor.

[0009] To achieve the above-mentioned objectives, this application provides the following technical solution:

[0010] An explosion-proof motor based on spiral flow channel and atomized cooling function includes a housing and a rotor and a stator disposed inside the housing; the housing includes a front cover, a shell, and a rear cover; the rotor includes a rotor core and a shaft, one end of the shaft extending out of the front cover and the other end extending out of the rear cover; the stator includes stator coils and a stator core, and a set of spiral ribs is provided on the outer circumferential surface of the stator core, with spiral flow channels formed between adjacent spiral ribs; the top of the spiral ribs abuts against the inner wall of the shell to form an interference fit, so that the stator... The iron core is fixed relative to the shell; on the rotating shaft, an internal circulation centrifugal fan and an internal circulation axial flow fan are respectively provided on both sides of the rotor iron core, and the air blowing direction of the internal circulation axial flow fan is towards the internal circulation centrifugal fan; a guide shroud is provided at the rear end of the casing, and correspondingly, an external air duct fan is provided at the rear end of the rotating shaft. When the motor is working, the cooling air flows out from the outlet of the guide shroud and exchanges heat with the surface of the shell; an atomizing device is provided at the inlet of the guide shroud, and the atomizing device is used to input aerosol containing liquid cooling medium into the guide shroud.

[0011] The explosion-proof motor based on spiral flow channel and atomization cooling function of the present invention guides the airflow along the spiral path through the spiral flow channel, causing the airflow to generate rotational motion and secondary flow during the flow process, thereby extending the airflow path and enhancing the heat exchange between the airflow and the housing. In addition, the spiral ribs make the stator and housing assembly area larger and the structure more reliable. At the same time, through the cooperation of the atomizing device and the external airflow fan, the atomizing device generates a mist containing liquid cooling medium, which is delivered to the surface of the motor housing. The liquid in the mist evaporates fully near the surface of the motor housing, significantly improving the heat dissipation effect. In this way, the internal circulation airflow enhances internal heat exchange through spiral flow, and the external airflow enhances external heat exchange through gas-liquid two-phase flow, thereby achieving efficient overall heat dissipation of the motor.

[0012] As an optimization, in the aforementioned explosion-proof motor based on spiral flow channel and atomized cooling function, the external airflow fan is an axial flow fan; the guide shroud includes an outer guide cone and an inner guide cone, one on the outside and one on the inside, forming an external airflow channel. The front end of the outer guide cone is provided with a guide ring distributed along the motor axis, so that the outlet of the external airflow channel is parallel to the outer surface of the casing. This structure can guide the airflow to be evenly distributed on the outer surface of the motor, reducing local flow separation and vortex areas, thereby further improving the heat exchange efficiency of the external airflow.

[0013] As an optimization, in the aforementioned explosion-proof motor based on spiral flow channel and atomization cooling function, the atomizing device includes an outer cover and an ultrasonic transducer; the outer cover is provided with an air inlet channel, a liquid inlet channel, and an atomization outlet; the air inlet channel is used to input air into the atomizing device, the liquid inlet channel is used to input liquid cooling medium into the atomizing device, the ultrasonic transducer is used to break the liquid cooling medium into small droplets under high-frequency vibration to form a mist, which mixes with the input air to form an aerosol, and the atomization outlet is used to output the aerosol. This specific atomizing device structure, in conjunction with the external airflow fan, can fully mix the atomized droplets with the airflow to form a gas-liquid two-phase flow, and is easy to implement.

[0014] As an optimization, in the aforementioned explosion-proof motor based on spiral flow channel and atomization cooling function, the inlet of the flow guide shroud is equipped with a silencer, the silencer has an air inlet, and the air inlet is equipped with a silencer mesh; the atomization outlet is located inside the silencer. With this structure, the silencer mesh reduces airflow noise, allowing even minor abnormal noises to be detected promptly by maintenance personnel, and the silencer mesh also provides protection.

[0015] As an optimization, in the aforementioned explosion-proof motor based on spiral flow channel and atomization cooling function, the blades of the external air duct fan are provided with a set of through holes. Opening holes on the blades can balance the axial force.

[0016] As an optimization, in the aforementioned explosion-proof motor based on spiral flow channel and atomization cooling function, in order to install and fix the atomizing device, the silencer cover is provided with a mounting hole in the center, and the atomizing device is disposed in the mounting hole.

[0017] As an optimization, in the aforementioned explosion-proof motor based on spiral flow channel and atomization cooling function, a liquid inlet is provided on the end face of the silencer cover, and the liquid inlet is connected to the liquid inlet channel through a liquid inlet pipe. This design is easy to implement and has a reliable structure.

[0018] As an optimization, in the aforementioned explosion-proof motor based on spiral flow channel and atomized cooling function, the silencer is welded to the air guide. This structure has better sealing performance and can significantly reduce wind noise.

[0019] As an optimization, in the aforementioned explosion-proof motor based on spiral flow channels and atomized cooling function, the internal circulation centrifugal fan is located on the front side of the rotor core. This structure can form a coordinated ventilation mode of "front pressure and rear suction," improving overall ventilation efficiency.

[0020] As an optimization, in the aforementioned explosion-proof motor based on spiral flow channel and atomized cooling function, the outer circumferential surface of the housing is provided with groups of axially distributed heat dissipation fins. This structure can increase the heat dissipation area and improve heat exchange efficiency.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects: ① The present invention optimizes the traditional straight-through internal airflow path into a spiral flow channel structure in which the top of the spiral ribs abuts against the inner wall of the shell to form an interference fit. This causes the airflow to rotate and undergo secondary flow during the flow process, prolonging the flow path of the airflow on the stator surface and increasing the contact area and contact time between the airflow and the interior of the shell, thereby improving the heat exchange efficiency. At the same time, the spiral flow helps to break the boundary layer, reduce local stagnation, and improve the overall heat exchange performance of the internal circulation airflow path; ② The present invention introduces an atomizing device into the external airflow path to atomize the liquid cooling medium into small particles. The droplets couple with the fan airflow to form a gas-liquid two-phase flow. The droplets gradually evaporate and absorb heat during the flow process, and the heat transfer capacity per unit mass is significantly improved by utilizing the latent heat of phase change. Compared with the traditional single gas phase cooling method, this structure can effectively improve the heat dissipation capacity of the external air path, and is particularly suitable for high heat flux density conditions. ③ Without significantly increasing the structural complexity, this invention improves heat dissipation performance by optimizing the flow channel and introducing atomized cooling. Compared with the traditional liquid cooling system, it does not require a complex liquid circuit structure and has the advantages of simple structure, low cost and strong applicability. It is suitable for motor cooling scenarios with high power density and limited space. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the explosion-proof motor based on the spiral flow channel and atomization cooling function in this application;

[0023] Figure 2 yes Figure 1 A cross-sectional view;

[0024] Figure 3 yes Figure 2 A schematic diagram of the middle section structure;

[0025] Figure 4 This is a schematic diagram of the stator structure in this application;

[0026] Figure 5 This is a schematic diagram of the airflow inside the motor in this application;

[0027] Figure 6 This is a schematic diagram of the heat exchange in the spiral flow channel of this application;

[0028] Figure 7 This is a schematic diagram of the airflow in the external wind path of this application;

[0029] Figure 8 This is a schematic diagram of the internal guide cone in this application;

[0030] Figure 9 This is a schematic diagram of the structure of the outer guide cone in this application;

[0031] Figure 10 This is a schematic diagram of the structure of the external ventilation fan in this application;

[0032] Figure 11 This is a schematic diagram of the atomizing device in this application;

[0033] Figure 12 This is a schematic diagram of the atomization principle in this application.

[0034] The labels in the attached diagram are as follows: 1-casing, 11-front end cover, 12-shell, 121-heat dissipation fins, 13-rear end cover; 2-silencing cover, 21-silencing mesh, 22-liquid inlet; 3-rotor, 31-rotor core, 32-shaft; 4-stator, 41-stator coil, 42-stator core, 421-spiral ribs; 5-internal circulation axial flow fan; 6-external air duct fan, 61-through hole; 7-guide shroud, 71-external guide cone, 72-inner guide cone, 73-guide ring; 8-atomizing device, 81-outer cover, 811-air inlet channel, 812-liquid inlet channel, 813-atomizing outlet, 82-ultrasonic transducer, 83-liquid inlet pipe; 9-internal circulation centrifugal fan. Detailed Implementation

[0035] The present application will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present application. In the following embodiments, content not described in detail or shown in detail in the accompanying drawings is common knowledge in the art.

[0036] Example (see) Figures 1-12 ):

[0037] An explosion-proof motor based on spiral flow channel and atomized cooling function includes a housing 1 and a rotor 3 and a stator 4 disposed inside the housing 1. The housing 1 includes a front cover 11, a shell 12, and a rear cover 13. The rotor 3 includes a rotor core 31 and a shaft 32, one end of which extends out of the front cover 11 and the other end extends out of the rear cover 13. The stator 4 includes a stator coil 41 and a stator core 42. A set of spiral ribs 421 are provided on the outer circumference of the stator core 42, and a spiral flow channel is formed between adjacent spiral ribs 421. The top of the spiral ribs 421 abuts against the inner wall of the shell 12 to form a spiral flow channel. An interference fit fixes the stator core 42 relative to the housing 12. On the rotating shaft 32, an internal circulation centrifugal fan 9 and an internal circulation axial flow fan 5 are respectively provided on both sides of the rotor core 31. The airflow direction of the internal circulation axial flow fan 5 is towards the internal circulation centrifugal fan 9. A guide shroud 7 is provided at the rear end of the housing 1. Correspondingly, an external airflow fan 6 is provided at the rear end of the rotating shaft 32. When the motor is working, the cooling air flows out from the outlet of the guide shroud 7 and exchanges heat with the surface of the housing 1. An atomizing device 8 is provided at the inlet of the guide shroud 7. The atomizing device 8 is used to input atomized air containing liquid cooling medium into the guide shroud 7.

[0038] In this embodiment, the liquid cooling medium is deionized water. This type of liquid is a non-flammable medium and will not form a flammable or explosive mixture in the operating environment of the explosion-proof motor, thus ensuring high safety. At the same time, it has a high specific heat capacity and high latent heat of vaporization, and after atomization, it has good evaporative heat absorption capacity, which can significantly improve heat dissipation efficiency. In addition, deionized water has low electrical conductivity, which reduces the risk of electrical short circuits.

[0039] In this embodiment, the external airflow fan 6 is an axial flow fan; the guide shroud 7 includes an outer guide cone 71 and an inner guide cone 72, one outer and one inner, forming an external airflow channel. The front end of the outer guide cone 71 is provided with a guide ring 73 distributed along the motor axis, so that the outlet of the external airflow channel is parallel to the outer surface of the housing 12. This structure can guide the airflow to be evenly distributed on the outer surface of the motor, reducing local flow separation and vortex areas, thereby improving the heat exchange efficiency of the external airflow.

[0040] In this embodiment, the atomizing device 8 includes an outer cover 81 and an ultrasonic transducer 82. The outer cover is provided with an air inlet channel 811, a liquid inlet channel 812, and an atomization outlet 813. The air inlet channel 811 is used to input air into the atomizing device 8, the liquid inlet channel 812 is used to input liquid cooling medium into the atomizing device 8, the ultrasonic transducer 84 is used to break the liquid cooling medium into small droplets under high-frequency vibration to form a mist, which mixes with the input air to form an aerosol, and the atomization outlet 813 is used to output the aerosol. This atomizing device 8 with this specific structure, in conjunction with the external airflow fan 6, can fully mix the atomized droplets with the airflow to form a gas-liquid two-phase flow, and absorb heat through droplet evaporation during the flow process, thereby significantly improving the heat exchange capacity.

[0041] In this embodiment, the inlet of the air guide shroud 7 is provided with a silencer shroud 2, the silencer shroud 2 is provided with an air inlet, and the air inlet is provided with a silencer mesh 21; the atomizing outlet 813 is located inside the silencer shroud 2. With this structure, the airflow noise is reduced by the silencer mesh, so that even slight abnormal noises can be detected by maintenance personnel in a timely manner, and the silencer mesh also plays a protective role.

[0042] In this embodiment, the blades of the external air duct fan 6 are provided with a set of through holes 61. Opening holes on the blades can balance axial forces, reduce bearing load, and improve the stability and service life of the equipment.

[0043] In this embodiment, the silencer 2 has a mounting hole in the center, and the atomizing device 8 is disposed in the mounting hole. This structure is used to install and fix the atomizing device 8, and facilitates the entry of air into the atomizing device 8.

[0044] In this embodiment, the end face of the silencer 2 is provided with a liquid inlet 22, which is connected to the liquid inlet channel 812 through a liquid inlet pipe 83. This design is easy to implement and has a reliable structure.

[0045] In this embodiment, the muffler 2 is welded to the air deflector 7. The welding connection method ensures good sealing between the muffler 2 and the air deflector 7, which can significantly reduce wind noise.

[0046] In this embodiment, the internal circulation centrifugal fan 9 is located on the front side of the rotor core 31. In this structure, when the centrifugal fan is placed on the front side, it can first force the high-pressure airflow into the front structural area of ​​the motor to achieve local strong cooling; while the axial fan is located on the rear side, which is responsible for overall ventilation and pushing the airflow into the outer spiral channel, forming a "front pressure and rear suction" coordinated ventilation mode to improve the overall ventilation efficiency.

[0047] In this embodiment, the outer peripheral surface of the housing 12 is provided with a group of heat dissipation fins 121 distributed along the axial direction. This structure can increase the heat dissipation area and improve the heat exchange efficiency.

[0048] In this embodiment, the explosion-proof motor based on spiral flow channel and atomization cooling function operates by using an internal airflow path through the cooperation of an internal circulation centrifugal fan 9 located on the left side of the stator 4 and an internal circulation axial fan 5 located on the right side of the stator. This causes the airflow inside the housing 12 to form a directional circulation flow. Through the spiral flow channel structure on the stator 4, the airflow generates rotation and secondary flow during the flow process, prolonging the flow path of the airflow on the surface of the stator 4 and increasing the contact area and contact time between the airflow and the inside of the housing 12, thereby improving the heat exchange efficiency. The external airflow path, through the cooperation of the atomizing device 8 and the external airflow fan 6, enables the atomized droplets to be fully mixed with the airflow, forming a gas-liquid two-phase flow. During the flow process, the droplets absorb heat through evaporation, thereby significantly improving the heat exchange capacity. This achieves overall high-efficiency heat dissipation of the motor.

[0049] The foregoing general description of the invention and its specific embodiments should not be construed as a limitation on the technical solution of the invention. Those skilled in the art, based on the disclosure of this application, can add, reduce, or combine the disclosed technical features in the foregoing general description and / or specific embodiments (including examples) without departing from the constituent elements of the invention, to form other technical solutions within the scope of protection of this application.

Claims

1. An explosion-proof motor based on spiral flow channel and atomization cooling function, comprising a housing (1) and a rotor (3) and a stator (4) disposed inside the housing (1); the housing (1) comprises a front cover (11), a shell (12) and a rear cover (13); the rotor (3) comprises a rotor core (31) and a shaft (32), one end of the shaft (32) extending out of the front cover (11) and the other end extending out of the rear cover (13); the stator (4) comprises a stator coil (41) and a stator core (42); characterized in that: The stator core (42) has a set of spiral ribs (421) on its outer circumferential surface, and a spiral flow channel is formed between adjacent spiral ribs (421); the top of the spiral ribs (421) abuts against the inner wall of the housing (12) to form an interference fit, so that the stator core (42) is fixed relative to the housing (12); on the rotating shaft (32), on both sides of the rotor core (31), an internal circulation centrifugal fan (9) and an internal circulation axial flow fan (5) are respectively provided, the internal circulation The axial flow fan (5) blows air towards the internal circulation centrifugal fan (9); the rear end of the housing (1) is provided with a guide shroud (7), and correspondingly, the rear end of the rotating shaft (32) is provided with an external air duct fan (6). When the motor is working, the cooling air flows out from the outlet of the guide shroud (7) and exchanges heat with the surface of the housing (1); the inlet of the guide shroud (7) is provided with an atomizing device (8), which is used to input a mist containing liquid cooling medium into the guide shroud (7).

2. The explosion-proof motor based on spiral flow channel and atomized cooling function according to claim 1, characterized in that: The external airflow fan (6) is an axial flow fan; the guide shroud (7) includes an outer guide cone (71) and an inner guide cone (72) arranged on the outside and inside respectively. An external airflow guide channel is formed between the outer guide cone (71) and the inner guide cone (72). The front end of the outer guide cone (232) is provided with a guide ring (73) distributed along the motor axis, so that the outlet of the external airflow guide channel is parallel to the outer surface of the shell (12).

3. The explosion-proof motor based on spiral flow channel and atomized cooling function according to claim 2, characterized in that: The atomizing device (8) includes an outer cover (81) and an ultrasonic transducer (82); the outer cover is provided with an air inlet channel (811), a liquid inlet channel (812) and an atomization outlet (813); the air inlet channel (811) is used to input air into the atomizing device (8), the liquid inlet channel (812) is used to input liquid cooling medium into the atomizing device (8), the ultrasonic transducer (34) is used to break the liquid cooling medium into small droplets under high-frequency vibration to form a mist, which is mixed with the input air to form an aerosol, and the atomization outlet (813) is used to output the aerosol.

4. The explosion-proof motor based on spiral flow channel and atomized cooling function according to claim 3, characterized in that: The inlet of the flow guide (7) is provided with a silencer (2), the silencer (2) is provided with an air inlet, and the air inlet is provided with a silencer mesh (21); the atomization outlet (813) is located inside the silencer (2).

5. The explosion-proof motor based on spiral flow channel and atomized cooling function according to claim 4, characterized in that: The blades of the external air duct fan (6) are provided with a group of through holes (61).

6. The explosion-proof motor based on spiral flow channel and atomized cooling function according to claim 5, characterized in that: The silencer cover (2) has a mounting hole in the center, and the atomizing device (8) is located in the mounting hole.

7. The explosion-proof motor based on spiral flow channel and atomized cooling function according to claim 6, characterized in that: The silencer (2) is provided with a liquid inlet (22) on its end face, and the liquid inlet is connected to the liquid inlet channel (812) through a liquid inlet pipe (83).

8. The explosion-proof motor based on spiral flow channel and atomized cooling function according to claim 4, characterized in that: The silencer (2) is welded onto the flow guide (7).

9. The internal circulation axial flow fan (5) is located in front of the rotor core, and the internal circulation centrifugal fan (9) is located in front of the rotor core (31).

10. The explosion-proof motor based on spiral flow channel and atomized cooling function according to any one of claims 1-6, characterized in that: The outer circumferential surface of the shell (12) is provided with a group of heat dissipation fins (121) distributed along the axial direction.

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