Explosion-proof three-phase asynchronous motor with cooling structure

Abstract

The invention belongs to the technical field of motors, and discloses an explosion-proof three-phase asynchronous motor with a cooling structure, which comprises a motor shell and an output shaft arranged in the motor shell, the output shaft is externally connected with a rotor, the inner wall of the motor shell is connected with a stator coil matched with the rotor, and the outer wall of the motor shell is provided with an annular heat exchange groove. The upper end of the outer wall of the motor shell is provided with a liquid inlet groove. According to the explosion-proof three-phase asynchronous motor with the cooling structure, efficient heat exchange is achieved through the closed-loop liquid cooling channel design, the annular heat exchange grooves in the outer wall of the motor shell are communicated with the liquid inlet grooves and the liquid outlet grooves in the upper end and the lower end to form a complete cooling liquid circulation path, and the multiple heat exchange structures can ensure that heat is evenly transmitted and dissipated; the problem of local overheating caused by insufficient heat dissipation area of traditional natural heat dissipation is avoided, the heat management efficiency of the motor core component is remarkably improved, and the liquid cooling circulation channel is directly arranged in the motor shell, so that compared with a traditional external heat dissipation structure, the heat dissipation efficiency is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric motors, in particular to an explosion-proof three-phase asynchronous motor with a cooling structure. BACKGROUND

[0002] As a core power equipment in the industrial field, three-phase asynchronous motors are widely used in high-risk scenarios such as mining, chemical production, and oil and gas transportation. Such scenarios have strict requirements for the explosion-proof performance of motors to prevent electric sparks and high-temperature components from igniting combustible gases and dust in the environment during motor operation, thereby avoiding safety accidents. At the same time, during motor operation, components such as stator coils and rotors generate a large amount of heat due to electromagnetic induction and mechanical friction. If the heat cannot be dissipated in time, the internal temperature of the motor will continue to rise, which on the one hand accelerates the aging of the insulation layer, shortens the service life of the motor, and even causes winding burnout and other faults. On the other hand, high temperatures can damage the sealing of the explosion-proof structure, leading to a decrease in the explosion-proof grade and further increasing the safety hazard. Therefore, the coordinated improvement of explosion-proof performance and heat dissipation efficiency is a core technical requirement for three-phase asynchronous motors used in high-risk scenarios. However, the existing explosion-proof three-phase asynchronous motor still has some problems in use: The existing high-temperature-resistant explosion-proof three-phase asynchronous motor (Chinese patent application No. CN202323101501.2) includes a three-phase asynchronous motor body, an installation base fixedly installed on the outer side of the three-phase asynchronous motor body, a connecting bottom plate provided on the inner side of the installation base and located at the lower end of the three-phase asynchronous motor body, a reinforcing plate fixedly installed at equal intervals on the outer side of the installation base, and a threaded hole provided through the inside of the installation base. A cooling fan is installed inside the connecting bottom plate. A prefabricated groove is provided on the inner wall end of the installation base. A circulating cooling pipe is connected to the upper end of the cooling box. An explosion-proof assembly is installed on the outer side of the upper end of the three-phase asynchronous motor body and located on the installation base. A heat sink is provided at equal intervals through the inside of the upper end of the explosion-proof assembly.

[0003] In the prior art, to improve the explosion-proof performance, the shell sealing is often strengthened, making it difficult for the internal heat to dissipate. If the ventilation opening is increased to improve the heat dissipation efficiency, the explosion-proof sealing level will be reduced. The existing solution is to use an external cooling structure, but the heat dissipation efficiency is not ideal due to factors such as contact area.

[0004] To solve the above problems, an innovative design is made based on the original explosion-proof three-phase asynchronous motor with a cooling structure. SUMMARY

[0005] The present application aims to provide an explosion-proof three-phase asynchronous motor with a cooling structure to solve the problem of low heat dissipation efficiency of the existing explosion-proof motor after the sealing of the reinforced shell is strengthened, which relies on an external heat dissipation structure and is affected by factors such as contact area.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: an explosion-proof three-phase asynchronous motor with a cooling structure, comprising a motor shell and an output shaft arranged inside, the output shaft being connected to a rotor outside, and a stator coil adapted to the rotor being connected to the inner wall of the motor shell: An annular heat exchange groove is formed in the outer wall of the motor shell, a liquid inlet groove is formed in the upper end of the outer wall of the motor shell, and a liquid outlet groove is formed in the lower end of the motor shell, an annular fin is arranged on the outer wall of the motor shell, and a heat exchange rod is connected to the inner wall of the annular fin; A sealing cover is clamped and installed on the left side of the motor shell, a gear ring is arranged inside the sealing cover, the outer wall of the gear ring is connected to a flow guide block, the flow guide block is slidingly connected to the inner wall of the sealing cover, and through holes are formed in the right side of the sealing cover corresponding to the positions of the liquid inlet groove and the liquid outlet groove, and the flow guide block drives the circulation of the cooling liquid when rotating.

[0007] Preferably, a junction box is fixed to the upper end of the motor shell, and an installation seat in the shape of an "eight" is fixed to the lower end of the motor shell, the installation seat is provided with bolt holes, and a rubber gasket is attached to the bottom of the installation seat.

[0008] The above technical solution can centrally protect the wiring part of the motor by arranging the junction box, avoid the wiring from being exposed, meet the explosion-proof requirements, prevent the leakage of electric sparks from causing safety hazards, and stably install the motor in a specified position through the bolt holes of the installation seat in the shape of an "eight", the rubber gasket at the bottom can reduce the transmission of vibration during the operation of the motor, play a shock-absorbing and buffering role, and enhance the sealing and anti-skid properties of the installation seat and the installation surface, to ensure the stable operation of the motor under different working conditions.

[0009] Preferably, the annular fin and the annular heat exchange groove are arranged in an equidistant array, and the inner wall of the annular fin is fixed to the motor shell, one end of the heat exchange rod extends into the annular heat exchange groove, and the heat exchange rods are arranged in an annular array around the output shaft.

[0010] The above technical solution can make the heat distribution of the motor shell more uniform by arranging the annular fin and the annular heat exchange groove in an equidistant array, avoid local overheating, effectively increase the contact area between the motor shell and the air, and improve the natural convection heat dissipation effect of the air; one end of the heat exchange rod extends into the annular heat exchange groove, the other end is connected to the annular fin, can efficiently transfer the heat absorbed by the cooling liquid in the annular heat exchange groove to the annular fin, quickly dissipate the heat to the air through the fin, and the annular array of the heat exchange rods can ensure the uniformity of heat transfer, further improve the overall cooling efficiency.

[0011] Preferably, the upper and lower ends of the annular heat exchange groove are communicated with the liquid inlet groove and the liquid outlet groove respectively, the left ends of the liquid inlet groove and the liquid outlet groove are provided with sealing washers, and the right end of the sealing cover is in contact with the sealing washer when the sealing cover is clamped with the motor shell.

[0012] According to the technical scheme, the annular heat exchange groove is communicated with the liquid inlet groove and the liquid outlet groove, so that a complete cooling liquid circulation channel is formed, the cooling liquid can continuously flow through the motor shell to take away the heat generated inside, the sealing washers at the liquid inlet groove and the liquid outlet groove are in close contact when the sealing cover is clamped, so that the sealing property of the connection part is effectively ensured, the leakage of the cooling liquid is prevented, the loss of the cooling liquid is avoided to affect the cooling effect, and the external dust, water vapor and the like are prevented from entering the inside of the channel, so that the sealing protection requirement of the explosion-proof motor is met, and the operation reliability of the equipment is improved.

[0013] Preferably, the outer wall of the motor shell is connected with plate fins, the plate fins are distributed in a perpendicular state with the annular fins, and the plate fins are distributed in a ring array around the output shaft.

[0014] According to the technical scheme, the plate fins are distributed in a perpendicular state with the annular fins, so that a cross type heat dissipation structure is formed, the total heat dissipation area is increased, the air flow path is optimized, the air can pass through the fin gaps from different directions, the air convection heat dissipation effect is enhanced, the plate fins are distributed in a ring array around the output shaft, so that the heat of each region of the motor shell in the circumferential direction can be efficiently dissipated through the fins, the local heat accumulation is avoided, and the heat dissipation uniformity of the motor is further improved.

[0015] Preferably, the both ends of the gear ring are embedded in the inner wall of the sealing cover, the gear ring is rotationally connected with the inner wall of the sealing cover, the gear ring and the inner wall of the sealing cover are kept sealed when the gear ring rotates, and the flow guide blocks are distributed in a ring array on the outer wall of the gear ring.

[0016] According to the technical scheme, the both ends of the gear ring are embedded in the inner wall of the sealing cover and kept sealed in rotation, so that the stable rotation of the gear ring is ensured and the sealing property of the inner space of the sealing cover is ensured, the explosion-proof requirement is met, and the leakage of the cooling liquid in the space between the outer part of the gear ring and the inner wall of the sealing cover is prevented; the flow guide blocks are distributed in a ring array on the gear ring, so that a stable driving force is formed when the flow guide blocks rotate, the cooling liquid is pushed to circulate between the liquid inlet groove, the annular heat exchange groove and the liquid outlet groove, the continuity and stability of the cooling liquid circulation are ensured, and the cooling effect is improved.

[0017] Preferably, the inner wall of the gear ring is connected with a first gear in meshing, a rotating shaft is connected to the middle part of the first gear, the both ends of the rotating shaft are rotationally connected with the inner wall of the sealing cover, the output shaft penetrates the middle part of the sealing cover, a second gear is key connected to the left end of the output shaft, and the second gear is meshed with the first gear.

[0018] By adopting the above technical solution, when the output shaft rotates, the gear ring is driven to rotate through the meshing transmission of the second gear and the first gear. No additional power source is required, and the guide block can be driven by the motor's own running power, which saves energy and makes the overall structure more compact. The gear transmission has the characteristics of stable transmission and high efficiency, which can ensure the stable rotation speed of the gear ring and the guide block, thereby ensuring the stability of the coolant circulation flow and improving the reliability of cooling efficiency.

[0019] Preferably, a sealing cover is fitted onto the left side of the sealing cover, an impeller is disposed in the middle of the sealing cover, the left side of the output shaft passes through the sealing cover and is connected to the impeller, a guide shroud is disposed outside the impeller, a through hole is opened at the lower end of the sealing cover, the lower end of the guide shroud communicates with the outside of the sealing cover, and air outlet holes are opened on both sides of the sealing cover.

[0020] Using the above technical solution, the output shaft drives the impeller to rotate. Under the guidance of the guide shroud, external air can be drawn in through the through hole at the bottom of the sealing cover, accelerated by the impeller, and discharged from the air outlets on both sides, forming a forced airflow. This airflow can provide air cooling for the sealing cover and surrounding structure, and can also remove the heat inside the sealing cover. Combined with the liquid cooling structure, it forms a composite cooling system, further improving the overall heat dissipation effect. The sealing cover is installed by snap-fit, which is convenient for later maintenance, and the overall sealing design meets the explosion-proof requirements.

[0021] Preferably, a filter screen is fitted inside the through hole, and a heat exchange plate is connected to the left end face of the sealing cover. The heat exchange plate has an arc-shaped design and is distributed in a ring array.

[0022] By adopting the above technical solution, the filter screen can filter the intake air, preventing dust and impurities from entering the sealed cover, avoiding impurities from affecting the normal operation of impellers, gears and other components or causing channel blockage, thus extending the service life of the equipment; the arc-shaped heat exchange plate can increase the contact area with the airflow, and the ring array distribution can ensure the uniformity of contact with the airflow. When the airflow driven by the impeller flows through the heat exchange plate, it can efficiently remove the heat transferred by the heat exchange plate to the sealed cover. The arc structure can also optimize the airflow path, reduce wind resistance and improve heat dissipation efficiency.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: The explosion-proof three-phase asynchronous motor with a cooling structure achieves efficient heat exchange through a closed-loop liquid cooling channel design. The annular heat exchange groove on the outer wall of the motor housing is connected to the upper and lower liquid inlet and outlet grooves to form a complete coolant circulation path. The multiple heat exchange structures can ensure uniform heat transfer and dissipation, avoiding the problem of local overheating caused by insufficient heat dissipation area in traditional natural heat dissipation, significantly improving the thermal management efficiency of the motor's core components. Moreover, the liquid cooling circulation channel is directly set inside the motor housing, which has higher heat dissipation efficiency compared with the traditional external heat dissipation structure.

[0024] 1. Compared to the traditional design of external liquid cooling that requires an additional power source, this invention uses the motor's own output shaft as the power source: the output shaft drives the gear ring inside the sealing cover to rotate through the meshing of the second gear and the first gear. The guide block on the outer wall of the gear ring rotates as a whole, which can drive the coolant to flow stably in the circulation channel without the need for an external cooling pump. This greatly simplifies the system structure, realizes the compact design of the overall device, and the overall sealing structure meets the explosion-proof standard. It solves the problems of easy leakage, small contact area, and unsatisfactory heat dissipation efficiency of external liquid cooling pipes. 2. This invention integrates liquid cooling and air cooling dual heat dissipation structures to form a synergistic cooling system: the liquid cooling part absorbs and transfers core heat through an annular heat exchange groove, heat exchange rod, and annular fins; the air cooling part relies on the output shaft to drive the impeller inside the sealing cover to rotate, and under the guidance of the guide shroud, it draws in air from the lower end, accelerates it, and blows it onto the arc-shaped heat exchange plate. At the same time, the vertical distribution of plate-shaped fins and annular fins optimizes the air convection path, which not only removes the heat dissipated by the liquid cooling system, but also directly cools the motor housing and sealing cover; the air and liquid structures operate independently and do not interfere with each other, avoiding the defects of traditional single heat dissipation methods, further improving the overall heat dissipation efficiency, and adapting to the continuous cooling requirements under high load conditions. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the invention from another perspective; Figure 3 This is a schematic diagram of the sealing cover and motor housing structure of the present invention; Figure 4 This is a schematic diagram of the motor housing and output shaft structure of the present invention; Figure 5 This is a schematic cross-sectional view of the motor housing of the present invention; Figure 6 This is a schematic diagram of the sealing cover and output shaft structure of the present invention; Figure 7 This is a schematic diagram of the output shaft and the second gear structure of the present invention; Figure 8 This is a schematic diagram of the toothed ring and guide block structure of the present invention; Figure 9 This is a schematic diagram of the sealing cover and heat exchange plate structure of the present invention; Figure 10 This is a schematic diagram of the impeller and guide vane structure of the present invention.

[0026] In the diagram: 1. Motor housing; 2. Output shaft; 3. Junction box; 4. Mounting base; 5. Liquid inlet tank; 6. Liquid outlet tank; 7. Annular heat exchange tank; 8. Heat exchange rod; 9. Annular fins; 10. Plate fins; 11. Sealing cover; 12. Gear ring; 13. Guide block; 14. First gear; 15. Second gear; 16. Sealing gasket; 17. Sealing cover; 18. Impeller; 19. Guide cover; 20. Filter screen; 21. Heat exchange plate. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0028] Please see Figures 1-10 The present invention provides the following technical solutions Example 1: This invention provides a technical solution: an explosion-proof three-phase asynchronous motor with a cooling structure, including a motor housing 1 and an output shaft 2 disposed inside. The output shaft 2 is externally connected to a rotor. A stator coil adapted to the rotor is connected to the inner wall of the motor housing 1. A junction box 3 is fixed to the upper end of the motor housing 1, and mounting seats 4 arranged in a figure-eight pattern are fixed to the lower end of the motor housing 1. The mounting seats 4 have bolt holes, and rubber gaskets are attached to the bottom of the mounting seats 4. The external power cord is introduced through the explosion-proof gland of the junction box 3 and crimped with the internal wiring terminals. After wiring is completed, the box cover is closed, and anti-rust grease is applied to the explosion-proof surface between the box cover and the box body to ensure that the explosion-proof surface is not worn when opening and closing. During normal operation, the heat generated by the current at the wiring terminals inside the junction box 3 is conducted to the motor housing 1 through the box body and then dissipated through the subsequent cooling structure. The mounting base 4, arranged in a figure-eight pattern, is fixed to the equipment base with bolts. After the expansion bolts are tightened, the silicone rubber gasket at the bottom of the mounting base 4 deforms due to compression, filling the tiny gaps on the mounting surface. On the one hand, this reduces the transmission of vibration during motor operation and prevents resonance between the load equipment and the motor. On the other hand, it enhances the anti-slip properties between the mounting base 4 and the base, preventing the motor from shifting under impact loads.

[0029] An annular heat exchange groove 7 is formed on the outer wall of the motor housing 1. A liquid inlet groove 5 is formed at the upper end of the outer wall of the motor housing 1, and a liquid outlet groove 6 is formed at the lower end of the outer wall of the motor housing 1. An annular fin 9 is fitted on the outer wall of the motor housing 1, and a heat exchange rod 8 is connected to the inner wall of the annular fin 9. The annular fin 9 and the annular heat exchange groove 7 are equidistantly arranged in an array, and the inner wall of the annular fin 9 is fixed to the motor housing 1. The inner end of the heat exchange rod 8 extends into the interior of the annular heat exchange groove 7, and the heat exchange rod 8 is arranged in an annular array with the output shaft 2 as the center. A plate-shaped fin 10 is connected to the outer wall of the motor housing 1. The plate-shaped fin 10 is arranged perpendicularly to the annular fin 9, and the plate-shaped fin 10 is arranged in an annular array with the output shaft 2 as the center. Coolant is injected through the inlet tank 5. Since the inlet tank 5 is connected to all annular heat exchange tanks 7, the coolant is rapidly distributed into each annular heat exchange tank 7. During motor operation, the inner wall of the motor housing 1 absorbs heat generated by the stator coils and rotor, which is then conducted through the inner wall of the housing to the inner wall of the annular heat exchange tank 7, where it exchanges heat with the coolant. Simultaneously, the heat exchange rod 8 efficiently conducts the heat from the coolant in the annular heat exchange tank 7 to the annular fins 9. The annular fins 9 increase their contact area with the air, dissipating the heat to the surrounding environment. The coolant that has completed heat exchange collects in the lower outlet tank 6 and is then transported back to the inlet tank 5 via the supply structure, forming a closed-loop liquid cooling path to achieve continuous cooling of the motor housing 1. The plate-shaped fins 10 are vertically distributed with the annular fins 9, forming a "lateral-longitudinal" cross-heat dissipation structure: during natural ventilation, the increased contact area with the fin structure helps to dissipate heat from the motor; furthermore, the plate-shaped fins 10, being higher than the annular fins 9, prevent external objects from directly impacting the annular fins 9 and the heat exchange rod 8, providing protection. The coolant needs to be changed regularly, and the coolant circulation path should be flushed with a neutral cleaning agent to ensure that the passage is free of impurities and blockages. If dust accumulates on the fin structure after prolonged use, it can be cleaned by blowing it out with compressed air.

[0030] A sealing cover 11 is fitted onto the left side of the motor housing 1. A toothed ring 12 is installed inside the sealing cover 11, and a guide block 13 is connected to the outer wall of the toothed ring 12. The guide block 13 is slidably connected to the inner wall of the sealing cover 11. Through holes are opened on the right side of the sealing cover 11 at positions corresponding to the inlet tank 5 and the outlet tank 6. The guide block 13 drives the coolant to circulate when it rotates. The annular heat exchange tank 7 is connected to the inlet tank 5 and the outlet tank 6 at its upper and lower ends, respectively. Sealing gaskets 16 are installed at the left ends of both the inlet tank 5 and the outlet tank 6. When the sealing cover 11 is engaged with the motor housing 1, the right end of the sealing cover 11 contacts the sealing gaskets. The toothed ring 12 is in contact with the inner wall of the sealing cover 11 at both ends. The toothed ring 12 is rotatably connected to the inner wall of the sealing cover 11, and the toothed ring 12 maintains a seal with the inner wall of the sealing cover 11 when rotating. The guide blocks 13 are distributed in a ring array on the outer wall of the toothed ring 12. The inner wall of the toothed ring 12 is meshed with a first gear 14. The middle of the first gear 14 is connected to a rotating shaft. The two ends of the rotating shaft are rotatably connected to the inner wall of the sealing cover 11. The output shaft 2 passes through the middle of the sealing cover 11. The left end of the output shaft 2 is keyed to a second gear 15. The second gear 15 is meshed with the first gear 14. When the motor is running, the output shaft 2 drives the second gear 15 at the left end to rotate synchronously. The second gear 15 drives the first gear 14 to rotate through meshing transmission. The first gear 14 meshes with the toothed ring 12, driving the toothed ring 12 to rotate at a low speed. The guide blocks 13 on the outer wall of the toothed ring 12 rotate synchronously with the toothed ring 12, forming a stable rotational thrust. (The outer ring of the gear ring 12 and the inner wall of the sealing cover 11 form an annular sealed space.) The outlet groove 6 is designed with an inclination, allowing the internal coolant to flow from the left end into the sealed space formed by the gear ring 12 and the sealing cover 11. During the rotation of the multiple sets of guide blocks 13, the coolant is transported upwards and flows back into the inlet groove 5 through the upper through hole, thus forming a coolant circulation loop. The sealing cover 11 is a closed structure, with internal gear transmission and coolant circulation occurring within the sealed space, preventing sparks generated by meshing friction from contacting external flammable media. All connecting bolts are coated with explosion-proof sealant to fill thread gaps and prevent spark leakage. A coolant filling port is installed on the top of the sealing cover 11, and a sealing plug is provided.

[0031] Example 2 differs from Example 1 in that it incorporates an air-cooled structure to further improve overall heat dissipation efficiency and meet the continuous cooling requirements under high load conditions. A sealing cover 17 is fitted onto the left side of the sealing cover 11. An impeller 18 is positioned in the middle of the sealing cover 17. The output shaft 2 passes through the sealing cover 17 on its left side and is connected to the impeller 18. A guide shroud 19 is positioned outside the impeller 18. A through hole is opened at the lower end of the sealing cover 17, and the lower end of the guide shroud 19 communicates with the outside of the sealing cover 17. Air outlets are opened on both sides of the sealing cover 17. A filter screen 20 is fitted inside the through hole. A heat exchange plate 21 is connected to the left end face of the sealing cover 11. The heat exchange plate 21 has an arc-shaped design and is arranged in a ring array. While the output shaft 2 rotates, it drives the impeller 18 to rotate inside the sealing cover 17. The arc-shaped blades of the impeller 18 generate centrifugal force, creating a negative pressure inside the guide shroud 19. Under the action of negative pressure, external air is drawn in through the through hole at the lower end of the sealing cover 17. After being filtered and dust-intercepted by the filter screen 20, it enters the lower end of the guide shroud 19 and flows towards the central area of ​​the impeller 18, continuing to flow upward. After flowing out of the guide shroud 19, it flows along the area between the outside of the guide shroud 19 and the sealing cover 17. During the flow, the airflow is in full contact with the heat exchange plate 21. The heat exchange plate 21 can absorb the waste heat of the liquid cooling system transferred by the sealing cover 11, so that the airflow after heat exchange can be discharged from the air outlets on both sides of the sealing cover 17. During the circulation of coolant inside the sealing cover 11, some heat is transferred to the left end face through the wall of the sealing cover 11. Because the heat exchange plate 21 is in close contact with the left end face of the sealing cover 11, it quickly absorbs this heat. The arc-shaped heat exchange plate 21 increases the contact area with the airflow. At the same time, the plate surface is provided with transverse ribs to further break the airflow boundary layer and improve the convective heat transfer coefficient.

[0032] The contents not described in detail in this specification are prior art known to those skilled in the art. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof three-phase asynchronous motor with a cooling structure, comprising a motor housing (1) and an output shaft (2) arranged inside, the output shaft (2) being externally connected with a rotor, and the inner wall of the motor housing (1) being connected with a stator coil matched with the rotor, characterized in that: an annular heat exchange groove (7) is formed on the outer wall of the motor housing (1), a liquid inlet groove (5) is formed on the upper end of the outer wall of the motor housing (1), a liquid outlet groove (6) is formed on the lower end of the motor housing (1), and an annular fin (9) is arranged on the outer wall of the motor housing (1), and the inner wall of the annular fin (9) is connected with a heat exchange rod (8). A sealing cover (11) is clamped and installed on the left side of the motor housing (1), a tooth ring (12) is arranged inside the sealing cover (11), the outer wall of the tooth ring (12) is connected with a flow guide block (13), the flow guide block (13) is slidingly connected with the inner wall of the sealing cover (11), and the right side of the sealing cover (11) is provided with through holes corresponding to the liquid inlet groove (5) and the liquid outlet groove (6), and the flow guide block (13) drives the circulation of the cooling liquid when rotating. A terminal box (3) is fixed on the upper end of the motor housing (1), and an installation seat (4) arranged in the shape of an "eight" is fixed on the lower end of the motor housing (1), the installation seat (4) is provided with bolt holes, and a rubber gasket is attached to the bottom of the installation seat (4).

2. The explosion-proof three-phase asynchronous motor with a cooling structure according to claim 1, characterized in that: The annular fin (9) and the annular heat exchange groove (7) are arranged at equal intervals, and the inner wall of the annular fin (9) is fixed with the motor housing (1), the inner side of the heat exchange rod (8) extends into the annular heat exchange groove (7), and the heat exchange rod (8) is arranged in a ring shape around the output shaft (2).

3. The explosion-proof three-phase asynchronous motor with cooling structure according to claim 1, characterized in that: The annular heat exchange groove (7) is in communication with the liquid inlet groove (5) and the liquid outlet groove (6) at the upper and lower ends, respectively, the left end of the liquid inlet groove (5) and the liquid outlet groove (6) is provided with a sealing gasket (16), and the right end of the sealing cover (11) is in contact with the sealing gasket (16) when the sealing cover (11) is clamped with the motor housing (1).

4. The explosion-proof three-phase asynchronous motor with a cooling structure according to claim 3, characterized in that: The outer wall of the motor housing (1) is connected with a plate fin (10), the plate fin (10) is arranged in a vertical state with the annular fin (9), and the plate fin (10) is arranged in a ring shape around the output shaft (2).

5. The explosion-proof three-phase asynchronous motor with cooling structure according to claim 1, characterized in that: The tooth ring (12) is embedded in the inner wall of the sealing cover (11) at both ends, the tooth ring (12) is rotatably connected with the inner wall of the sealing cover (11), and the tooth ring (12) remains sealed with the inner wall of the sealing cover (11) when rotating, and the flow guide block (13) is arranged in a ring shape around the outer wall of the tooth ring (12).

6. The explosion-proof three-phase asynchronous motor with cooling structure according to claim 1, characterized in that: The inner wall of the tooth ring (12) is engaged with a first gear (14), the middle part of the first gear (14) is connected with a rotating shaft, the both ends of the rotating shaft are rotatably connected with the inner wall of the sealing cover (11), the output shaft (2) penetrates the middle part of the sealing cover (11), the left end of the output shaft (2) is keyed with a second gear (15), and the second gear (15) is engaged with the first gear (14).

7. The explosion-proof three-phase asynchronous motor with a cooling structure according to claim 6, characterized in that: ​ 8. The explosion-proof three-phase asynchronous motor with cooling structure according to claim 1, characterized in that: The sealing cover (11) is clamped and installed on the left side of the sealing cover (17), the middle part of the sealing cover (17) is provided with an impeller (18), the output shaft (2) penetrates the sealing cover (17) on the left side, and the output shaft (2) is connected with the impeller (18), the outside of the impeller (18) is provided with a flow guide cover (19), a through hole is formed in the lower end of the sealing cover (17), the lower end of the flow guide cover (19) is in communication with the outside of the sealing cover (17), and air outlet holes are formed in the two sides of the sealing cover (17).

9. The explosion-proof three-phase asynchronous motor with a cooling structure according to claim 8, characterized in that: The through hole is clamped with a filter screen (20), the sealing cover (11) is connected with a heat exchange plate (21) on the left end face, the heat exchange plate (21) is designed in an arc shape, and the heat exchange plate (21) is arranged in an annular array.

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