High efficiency flameproof three-phase asynchronous motor

Abstract

This invention discloses a high-efficiency explosion-proof three-phase asynchronous motor, including a motor housing, a stator, a rotor, and a shaft. A compression fan is fixed to the outer wall of the drive end of the shaft. A return flow channel is provided on the housing, arranged in a ring on the housing, with its two ends connected to the left and right ends of the housing, respectively, so that the airflow forms a closed heat exchange circuit within the housing. A heat-conducting connecting frame is provided between the inner wall of the housing and the stator, extending to the left end of the stator and equipped with a flow divider. This invention belongs to the field of motor technology. The purpose of this invention is to solve the problem in the prior art where the temperature of the internal components of the motor housing cannot be effectively conducted to the housing, easily causing local heat accumulation. The technical effect achieved is that the airflow is divided into two streams by the flow divider: the inner stream airflow directly cools the rotor and the left end of the stator through the exhaust port, and the outer stream airflow strengthens the cooling of the outer wall of the stator, accurately distributing the airflow to the rotor / stator ends where the heat accumulation is most severe.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a high-efficiency explosion-proof three-phase asynchronous motor. Background Technology

[0002] Explosion-proof three-phase asynchronous motors are widely used in environments with explosive hazardous gases, such as petroleum, chemical, coal mine, and natural gas. Their core requirement is to use special structures (such as a robust housing and precisely fitted explosion-proof joints) to confine any electrical sparks or high temperatures that may be generated inside the housing, preventing the ignition of the external explosive environment.

[0003] Traditional explosion-proof motors generally suffer from low efficiency, largely due to the heavy explosion-proof enclosure severely hindering heat dissipation. The heat generated internally (primarily from winding copper losses, core iron losses, and mechanical losses) is difficult to conduct effectively to the external environment, leading to excessively high internal motor temperatures. High temperatures significantly increase winding resistance, further increasing copper losses (I²R effect), creating a vicious cycle that drastically reduces motor efficiency and may shorten insulation life, impacting safety and reliability. Furthermore, the airtightness and structural strength requirements of the explosion-proof enclosure preclude the use of traditional ventilation cooling methods (such as perforated ventilation), and the internal space also limits the deployment of large-scale heat dissipation structures.

[0004] Existing heat dissipation solutions for explosion-proof motors have limited effectiveness; they typically involve increasing the heat dissipation area of ​​the housing and adding an external fan to draw airflow over the outer wall of the housing to dissipate heat. However, these heat dissipation designs are often conservative or simplistic, and the temperature of the internal components of the motor housing cannot be effectively conducted to the housing, which can easily lead to localized heat accumulation.

[0005] Therefore, it does not meet the existing requirements, so we proposed a high-efficiency explosion-proof three-phase asynchronous motor. Summary of the Invention

[0006] To address these issues, the present invention provides a high-efficiency explosion-proof three-phase asynchronous motor to solve the aforementioned problems in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] According to a first aspect of the present invention, a high-efficiency explosion-proof three-phase asynchronous motor includes a motor, the motor including a housing, a stator, a rotor and a shaft, a compressor fan being fixedly connected to the outer wall of the drive end of the shaft, and a return flow channel being provided on the housing, the return flow channel being arranged in a ring on the housing and the two ends being connected to the left end and the right end of the housing respectively, so that the airflow forms a closed heat exchange circuit in the housing.

[0009] A heat-conducting connection frame is provided between the inner wall of the housing and the stator. The heat-conducting connection frame extends to the left end of the stator and is provided with a flow divider.

[0010] The middle part of the flow divider is designed as a protrusion: the central protrusion divides the incoming gas into two streams. The first stream of gas is directed and pressurized to purge the rotor and stator ends, and the second stream of gas is guided to the outer wall of the stator and impacts the outer surface of the stator through the flow guiding structure on the connecting frame.

[0011] The inner cavity of the shell is a tapered cavity, which, together with the connecting frame, forms an airflow converging channel.

[0012] Furthermore, the connecting frame includes an annular connecting plate that contacts the outer wall of the stator. The annular connecting plate is connected to a circular sleeve via a connecting rod one, and the circular sleeve is fixed to the inner wall of the housing via a connecting rod two.

[0013] Furthermore, the airflow guiding structure includes an annular air intake shroud in a ring array and an inclined air intake, which is used to gather and pressurize the second airflow and then tilt it to impact the outer wall of the stator.

[0014] Furthermore, the annular air intake array is distributed on the outer wall of the circular sleeve, and the air intake is opened on the circular sleeve.

[0015] Furthermore, the central protrusion of the diversion shroud is designed as a diversion protrusion, and the central protrusion causes both the outer and inner surfaces of the diversion shroud to be inclined and concave.

[0016] Furthermore, the inner side is inclined and concave to form a first gathering groove, and the outer side is formed with the inner wall of the shell to form a second gathering groove. The airflow is divided into two parts by the arc-shaped surface of the diversion protrusion, which enter the first gathering groove and the second gathering groove respectively, and the gas is pressurized by their successively decreasing characteristics.

[0017] Furthermore, an exhaust port is provided at the bottom of the first gathering groove for directional blowing of the rotor and stator ends; the outlet of the second gathering groove is connected to the tapered cavity to guide the airflow to impact the outer wall of the stator.

[0018] Furthermore, the two ends of the annular connecting plate are arc-shaped to reduce gas flow resistance.

[0019] Furthermore, a fan is provided at the non-drive end of the shaft, and a fan cover is provided on the side of the housing near the fan.

[0020] Furthermore, heat dissipation grooves are provided on the outer wall of the housing.

[0021] The present invention has the following advantages:

[0022] 1. This high-efficiency explosion-proof three-phase asynchronous motor has a compressed fan driving airflow to form a closed loop path inside the motor (stator-rotor gap → right end of housing → return channel → left end of housing), exchanging heat with the housing throughout the process. The gas circulation channel and the heat-conducting connection structure form a dual heat dissipation path, realizing active heat removal inside the housing. The return channel runs through the front and rear ends of the housing, efficiently removing internal heat to the heat dissipation fin area and avoiding heat retention.

[0023] 2. This high-efficiency explosion-proof three-phase asynchronous motor, through the annular air intake shroud and inclined air intake of the connecting frame, combined with the frustum-shaped inner wall of the housing, forces and guides the airflow to precisely impact the outer wall of the stator, significantly improving the stator heat dissipation efficiency. Furthermore, the flow divider splits the airflow into two streams: the inner stream airflow directly cools the rotor and the left end of the stator through the exhaust port, while the outer stream airflow enhances the cooling of the outer wall of the stator. The airflow is precisely distributed to the rotor / stator ends where the heat accumulation is most severe, and the cooling of the outer wall of the stator is enhanced through the tapered cavity. Attached Figure Description

[0024] Figure 1 This is a front view of the high-efficiency explosion-proof three-phase asynchronous motor proposed in this invention;

[0025] Figure 2 for Figure 1 A cross-sectional view;

[0026] Figure 3 for Figure 1 A schematic diagram of the decomposition process;

[0027] Figure 4 for Figure 3 A cross-sectional view;

[0028] Figure 5 for Figure 4 Enlarged view of region A in the middle;

[0029] Figure 6 for Figure 4 Enlarged schematic diagram of the inner and outer shells;

[0030] Figure 7 for Figure 6 Decompose the main view;

[0031] Figure 8 for Figure 7 Main sectional view of the connecting frame;

[0032] Figure 9 for Figure 8 Bottom view;

[0033] Figure 10 for Figure 8 Front view;

[0034] Figure 11A front view showing the arc-shaped guide surfaces on both sides of the annular connecting plate.

[0035] In the diagram: 1. Motor; 11. Housing; 101. Outer shell; 102. Front cover; 103. Rear cover; 104. Rear end cover; 12. Stator; 13. Rotor; 14. Shaft; 201. Heat dissipation slot; 202. Heat dissipation fins; 203. Fan; 204. Fan cover; 31. Compressor fan; 32. Connecting frame; 321. Flow divider; 3211. Flow divider protrusion; 3212. Gathering groove one; 3213. Gathering groove two; 3214. Exhaust port; 3215. Air gathering groove; 322. Circular sleeve; 323. Annular connecting plate; 324. Connecting rod one; 325. Annular air intake cover; 326. Air inlet; 327. Connecting rod two; 33. Gradual converging cavity; 4. Return channel; 41. Air intake channel; 42. Horizontal flow channel; 43. Air outlet channel. Detailed Implementation

[0036] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1:

[0038] Reference Figures 1-4 A high-efficiency explosion-proof three-phase asynchronous motor includes a motor 1. The motor 1 includes a housing 11, a stator 12 installed inside the housing 11, and a rotor 13 installed inside the stator 12. A rotating shaft 14 is fixedly connected to the inner side of the rotor 13. A fan 203 is fixedly connected to the non-driving end of the rotating shaft 14 through the housing 11. A fan cover 204 is installed on the outer wall of the housing 11 near the fan 203. A heat dissipation groove 201 is formed on the outer wall of the housing 11. The outer wall of the housing 11 is divided into heat dissipation fins 202 by the heat dissipation groove 201 formed by the annular array.

[0039] Working principle: When the motor 1 is running, the shaft 14 rotates, and some of the heat generated inside is conducted to the housing 11. At the same time, the non-driving end of the shaft 14 drives the fan 203 to rotate. The back of the fan 203 faces the end opening of the heat sink 201. When the fan 203 rotates, it draws gas from the heat sink 201. The gas flows through the heat sink fins 202 and the heat sink 201, accelerating the contact between the airflow and the heat dissipation structure. Finally, it is discharged through the holes on the fan cover 204, effectively improving the heat dissipation efficiency of the housing 11.

[0040] Specifically: the housing 11 includes an outer shell 101, with a front cover 102 and a rear cover 103 respectively installed at both ends of the outer shell 101, and a rear end cover 104 connected to the outer side of the rear cover 103;

[0041] The non-drive end of the rotating shaft 14 passes through the rear cover 103 and the rear end cover 104 and is connected to the fan 203. A fan shroud 204 is installed on the rear side of the rear end cover 104. The space between the outer side of the rear end cover 104 and the inner side of the fan shroud 204 corresponds to the end opening of the heat dissipation slot 201. In this way, when the fan 203 rotates, it will draw gas through the end opening of the heat dissipation slot 201, which will drive the gas flow in the heat dissipation slot 201 to accelerate the heat dissipation efficiency.

[0042] Example 2:

[0043] Similar to Embodiment 1, the technical problem in the above solution is that the heat generated by the stator 12 and rotor 13 during operation is conducted to the housing 11 relatively slowly, especially at both ends of the rotor and stator, where there is no contact with the housing, easily leading to localized heat accumulation. Prolonged heat accumulation can cause high temperatures that damage the equipment. Therefore, furthermore: referring to... Figures 2-4 A high-efficiency explosion-proof three-phase asynchronous motor has a compressor fan 31 fixedly connected to the outer wall of the drive end of the rotating shaft 14, with the gas flow direction being... Figure 2 For example, from left to right, the gas flows through the gap between the stator 12 and the rotor 13 to the right end of the housing 11. A return channel 4 is opened on the housing 11 and distributed in a ring array. The two ends of the return channel 4 are connected to the left end and the right end of the housing 11, respectively. The gas blown to the right end of the housing 11 returns to the left end of the housing 11 through the return channel 4. At the same time, the gas will exchange heat with the housing 11 when it passes through the return channel 4, thereby improving the heat transfer efficiency.

[0044] Specifically: the return channel 4 includes an intake channel 41, a horizontal flow channel 42 and an exhaust channel 43; the intake channel 41 is opened on the rear cover 103, the horizontal flow channel 42 is opened on the outer shell 101, and the exhaust channel 43 is opened on the front cover 102.

[0045] Furthermore: A connecting frame 32 is installed between the outer side of the stator 12 and the inner wall of the housing 11. The connecting frame 32 is made of a heat-conducting material. Part of the gas blown out by the compression fan 31 passes through the gap between the stator 12 and the rotor 13, and the other part is blown towards the connecting frame 32 and directly towards the stator 12.

[0046] Specifically: the connecting frame 32 includes an annular connecting plate 323 that directly contacts the outer wall of the stator 12. The annular connecting plates 323 are arrayed on the outer wall of the stator 12. A connecting rod 324 is fixedly connected to the outer wall of the annular connecting plate 323. A circular sleeve 322 is connected to the outer side of the connecting rod 324. A connecting rod 327 is provided between the two ends of the circular sleeve 322 and the inner wall of the housing 11, and is fixedly connected to the housing 11 through the connecting rod 327. Annular air intake hoods 325 are arrayed on the outer wall of the circular sleeve 322. The annular air intake hoods 325 face the direction corresponding to the compressor fan 31. An air intake port 326 is opened at the bottom of the annular air intake hood 325. When gas passes through the outer wall of the circular sleeve 322, it is gathered by the annular air intake hood 325 and blown towards the outer wall of the stator 12. The opening angle of the air intake port 326 is inclined to... Figure 2 For example, the bottom of the air intake 326 is tilted to the right, and the tilt direction is consistent with the airflow direction;

[0047] The inner wall of the housing 11 is shaped like a frustum, with the diameter decreasing from left to right. Therefore, a gradually narrowing cavity 33 is formed between the outer side of the circular sleeve 322 and the housing 11, which decreases from left to right. The airflow in the space outside the circular sleeve 322 is reduced by the preceding annular air intake hoods 325 and air inlets 326. The remaining airflow is gathered and introduced into the following annular air intake hood 325 through the gradually decreasing space.

[0048] Furthermore, a protrusion is provided on the back cover 103, from Figure 2 As can be seen, the protrusion is located inside the stator 12, and the input end of the air intake channel 41 is located outside the protrusion; therefore, the airflow will pass through the right end of the stator 12 when it flows back, and will also pass through the left end of the stator 12 when it blows from the front, thereby exchanging heat with both ends of the stator 12 and reducing the probability of local heat accumulation.

[0049] Working principle: Based on embodiment 1, a compression fan 31 is added to the drive end of the rotating shaft 14. The rotation of the compression fan 31 generates airflow. Figure 2 (From left to right in the central direction), this airflow is mainly divided into two paths;

[0050] The flow passes through the gap between stator 12 and rotor 13;

[0051] Another airflow is directed towards the connecting frame 32 (made of thermally conductive material) and the outer wall of the stator 12; the annular air intake shroud 325 of the connecting frame 32 and its inclined air intake 326 can effectively gather and guide the airflow to impact the outer wall of the stator 12 for cooling; the inner wall of the housing 11 is designed as a frustum shape with a larger left side and a smaller right side, which, together with the circular sleeve 322, forms a gradually narrowing space, which helps to guide and gather the airflow to the subsequent annular air intake shroud 325, thereby improving the gas utilization rate;

[0052] Finally, all the airflow converges at the right end of the housing 11. The converged airflow returns to the left end of the housing 11 through the return channel 4 (composed of the air intake channel 41 on the rear cover 103, the horizontal flow channel 42 on the outer shell 101, and the air outlet channel 43 on the front cover 102). When the airflow flows through the return channel 4, it exchanges heat with the housing 11, accelerating the heat dissipation. At the same time, when the airflow flows through both ends of the stator 12 (the left end is directly swept by the airflow of the compressor fan 31, and the right end is swept by the airflow at the inlet of the return channel 4) and the protrusion area on the rear cover 103, the risk of local heat accumulation at both ends of the stator 12 is effectively reduced.

[0053] Example 3:

[0054] Basically the same as in Embodiment 2, except that a flow divider 321 is provided at the left end of the circular sleeve 322; furthermore: referring to Figure 2 , Figure 5 , Figures 8-10 A high-efficiency explosion-proof three-phase asynchronous motor has a diversion protrusion 3211 in the middle of the diversion shroud 321. Due to the central protrusion, the outer and inner surfaces of the diversion shroud 321 are inclined and concave. The inclined and concave inner surface forms a first gathering groove 3212, and the outer surface forms a second gathering groove 3213 between it and the inner wall of the housing 11. An exhaust port 3214 is also opened at the bottom of the first gathering groove 3212. The airflow is divided into two parts by the arc-shaped surface of the diversion protrusion 3211, which enter the first gathering groove 3212 and the second gathering groove 3213 respectively, and the gas is pressurized by their successively decreasing characteristics.

[0055] Orientation Reference Figure 2 For specific structure reference Figure 5 ;

[0056] The gas in the collecting groove 3212 is blown directly to the left end of the rotor 13 and the left end of the stator 12 through the exhaust port 3214. Part of the airflow passes through the gap between the stator 12 and the rotor 13, and the other part passes through the space between the outside of the stator 12 and the circular sleeve 322.

[0057] The gas in the gathering groove 3213 is blown toward the outside of the circular sleeve 322. The gradually decreasing space formed between the housing 11 and the inner wall of the circular sleeve 322 helps the airflow to converge, and the airflow is blown toward the outer wall of the stator 12 through the annular air intake shroud 325 and the air intake 326.

[0058] Finally, the gas gathers in the space on the right side of the inner wall of the shell 11 and is transported to the left side of the inner wall of the shell 11 through the return channel 4;

[0059] Working principle: The diversion protrusion 3211 in the middle of the diversion shroud 321 divides the incoming gas generated by the compressor fan 31 into two parts. The back of the diversion shroud 321 forms a concentrating groove 3215 after the diversion protrusion 3211 protrudes.

[0060] The internal airflow enters the gathering groove 3212 formed inside the flow divider 321; after the gas is pressurized by the groove, it is blown directly to the left end of the rotor 13 and the left end of the stator 12 through the exhaust port 3214 at its bottom; part of the blown airflow flows through the gap between the stator 12 and the rotor 13, and the other part enters the air gathering groove 3215, and then flows through the space between the outside of the stator 12 and the circular sleeve 322;

[0061] The outer airflow enters the gathering groove 3213 formed between the outer side of the diverter shroud 321 and the inner wall of the housing 11; this groove also pressurizes the gas; the pressurized gas is blown towards the outer space of the circular sleeve 322; this airflow works in conjunction with the gradually narrowing space formed by the frustum-shaped inner wall of the housing 11 and the circular sleeve 322 as described in Embodiment 2, further assisting the airflow to converge, and is more effectively blown towards the outer wall of the stator 12 for cooling through the subsequent annular air intake shroud 325 and air intake 326; finally, after the two airflows converge at the right end of the housing 11, they still return to the left end through the return channel 4, completing the forced internal circulation cooling, which focuses on enhancing the directional heat exchange effect on key parts inside the motor (such as the rotor end, stator end and outer wall);

[0062] The gas heat is fully exchanged with the shell 11 during the return flow.

Claims

1. A high-efficiency explosion-proof three-phase asynchronous motor, comprising a motor (1), said motor (1) comprising a housing (11), a stator (12), a rotor (13), and a shaft (14), characterized in that, A compressor fan (31) is fixed to the outer wall of the drive end of the rotating shaft (14). A return channel (4) is provided on the housing (11). The return channel (4) is arranged in a ring on the housing (11), and its two ends are connected to the left end and the right end of the housing (11) respectively, so that the airflow forms a closed heat exchange circuit in the housing (11). A heat-conducting connecting frame (32) is provided between the inner wall of the housing (11) and the stator (12). The heat-conducting connecting frame (32) extends to the left end of the stator (12) and is provided with a flow divider (321). The middle part of the flow divider (321) is provided as a protrusion, which divides the incoming gas into two streams. The first stream of gas is directed and pressurized to blow the rotor (13) and stator (12) ends, and the second stream of gas is guided to the outer wall of the stator (12) and impacts the outer surface of the stator through the flow guiding structure on the heat-conducting connecting frame (32). The inner cavity of the shell (11) is a tapered cavity (33), which, together with the connecting frame (32), forms an airflow converging channel.

2. The high-efficiency explosion-proof three-phase asynchronous motor according to claim 1, characterized in that, The connecting frame (32) includes an annular connecting plate (323) that contacts the outer wall of the stator (12). The annular connecting plate (323) is connected to a circular sleeve (322) via a connecting rod (324). The circular sleeve (322) is fixed to the inner wall of the housing (11) via a connecting rod (327).

3. The high-efficiency explosion-proof three-phase asynchronous motor according to claim 2, characterized in that, The airflow guiding structure includes an annular air intake shroud (325) in a ring array and an inclined air intake (326) for gathering and pressurizing the second airflow to impact the outer wall of the stator (12).

4. The high-efficiency explosion-proof three-phase asynchronous motor according to claim 3, characterized in that, The annular air intake shroud (325) array is distributed on the outer wall of the circular sleeve (322), and the air intake (326) is opened on the circular sleeve (322).

5. The high-efficiency explosion-proof three-phase asynchronous motor according to claim 4, characterized in that, The central protrusion of the flow divider (321) is designated as the flow divider protrusion (3211). Due to the central protrusion, both the outer and inner surfaces of the flow divider (321) are inclined and concave.

6. The high-efficiency explosion-proof three-phase asynchronous motor according to claim 5, characterized in that, The inner side is inclined and concave to form a first gathering groove (3212), and the outer side is formed with the inner wall of the shell (11) to form a second gathering groove (3213). The airflow is divided into two parts by the arc surface of the diversion protrusion (3211), which enter the first gathering groove (3212) and the second gathering groove (3213) respectively, and the gas is pressurized by their successively decreasing characteristics.

7. The high-efficiency explosion-proof three-phase asynchronous motor according to claim 6, characterized in that, The bottom of the first gathering groove (3212) has an exhaust port (3214) for directional blowing of the rotor (13) and the end of the stator (12). The outlet of the second gathering groove (3213) is connected to the tapered cavity (33) to guide the airflow to impact the outer wall of the stator (12).

8. The high-efficiency explosion-proof three-phase asynchronous motor according to claim 7, characterized in that, The two ends of the annular connecting plate (323) are arc-shaped to reduce gas flow resistance.

9. The high-efficiency explosion-proof three-phase asynchronous motor according to claim 1, characterized in that, The non-driving end of the rotating shaft (14) is provided with a fan (203), and the housing (11) is provided with a fan cover (204) on the side near the fan (203).

10. The high-efficiency explosion-proof three-phase asynchronous motor according to claim 9, characterized in that, The outer wall of the housing (11) is provided with heat dissipation grooves (201).

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