Permanent-magnet synchronous electric motor with externally mounted explosion-proof mechanism

Abstract

The present invention particularly relates to the field of permanent-magnet electric motors. Disclosed is a permanent-magnet synchronous electric motor with an externally mounted explosion-proof mechanism. The permanent-magnet synchronous electric motor comprises an enclosure, wherein the interior of an explosion-proof housing is divided into a first cavity and a second cavity by means of a first partition plate; auxiliary heat-dissipation fan blades are provided inside the first cavity, and the auxiliary heat-dissipation fan blades are fixedly arranged on a support shaft; the support shaft is in splined connection with an output shaft inside the enclosure; a heat-dissipation explosion-proof mechanism is provided inside the second cavity; and a high temperature display mechanism is provided on a side wall of an outer end of the explosion-proof housing. In the present invention, heat in the explosion-proof housing can be transmitted to sodium bicarbonate particles, and the sodium bicarbonate particles decompose under heat and can absorb heat when decomposing, thereby increasing the heat-dissipation efficiency of the enclosure; when an explosion occurs inside the enclosure, the air pressure and temperature inside the enclosure rapidly increase, and the air pressure can enter the explosion-proof housing and be relieved by means of heat-dissipation holes; in addition, an explosion-proof buffering airbag can play a role in buffering to achieve an explosion buffering function.

Description

A permanent magnet synchronous motor with an external explosion-proof mechanism Technical Field

[0001] The present invention relates to the technical field of permanent magnet synchronous motors, in particular to a permanent magnet synchronous motor with an external explosion-proof mechanism. Background Art

[0002] Permanent magnet synchronous motors use permanent magnets for excitation, simplifying their structure and reducing processing and assembly costs. They also eliminate slip rings and brushes, which are prone to problems, improving motor reliability. Furthermore, since no excitation current is required, there is no excitation loss, which increases the motor's efficiency and power density. However, under the same design parameters, permanent magnet synchronous motors are much smaller than other types of motors, posing a significant challenge to heat dissipation. Within the relatively small internal space of a permanent magnet synchronous motor, if heat generated cannot be dissipated promptly, the internal temperature will gradually rise. This can cause demagnetization of the permanent magnets in the rotor, affecting motor performance and, in severe cases, burning the stator windings and damaging the motor. Moreover, in modern industrial fields such as electricity, metallurgy, energy, and medicine, production and operation systems are becoming more and more complex, and there are more and more dangerous factors. Among them, the hidden danger of explosion caused by the presence of explosive gases is also more prominent. In order to ensure the normal operation of the factory and the safety of personnel, the safety requirements for equipment are getting higher and higher. In particular, electrical equipment in explosive environments must have explosion-proof functions. Electric actuators are an electrical equipment widely used in explosive environments. The whole machine and its components are required to have explosion-proof functions that meet the requirements of explosion-proof standards. In particular, the motor assembly is an important component of the explosion-proof electric actuator and is the main electrical device. During operation, the internal stator coil causes explosion due to external explosive gas due to heat or electric sparks. Therefore, the explosion-proof function of the motor assembly is particularly important.

[0003] Chinese patent authorization publication number CN 215267896 U discloses a permanent magnet synchronous motor, which connects the housing to the front cover and rear cover through flameproof joint surfaces, thereby achieving explosion-proof isolation between moving parts and electrical wiring components, preventing motor explosion caused by arcs or sparks generated during wiring.

[0004] However, the above patent only utilizes explosion-proof joint surfaces and explosion-proof sealing cavities for explosion-proofing, which has insufficient explosion-proof effect and cannot assist in heat dissipation of the permanent magnet synchronous motor. It is inconvenient for users to check the temperature inside the motor and is inconvenient for people to use.

[0005] Summary of the Invention

[0006] The object of the present invention is to provide a permanent magnet synchronous motor with an external explosion-proof mechanism to solve the problems raised in the above background technology.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: A permanent magnet synchronous motor with an external explosion-proof mechanism, comprising a casing, a front end cover is provided at the front end of the casing, an explosion-proof shell is provided at the rear end of the casing, the interior of the explosion-proof shell is divided into a first cavity and a second cavity by a first partition, an auxiliary heat dissipation fan blade is provided inside the first cavity, the auxiliary heat dissipation fan blade is fixedly provided on a support shaft, the support shaft is keyed to the output shaft inside the casing, a heat dissipation explosion-proof mechanism is provided inside the second cavity, and a high temperature display mechanism is provided on the outer end side wall of the explosion-proof shell.

[0008] In a preferred embodiment, the inner side wall of the casing is provided with a first annular cavity, the interior of the first annular cavity is divided into an air inlet cavity and an exhaust cavity by an annular sealing plate, one end of the air inlet cavity is provided with an air inlet port, and one end of the exhaust cavity is provided with an exhaust port, the side wall of the explosion-proof shell is provided with a first through hole connected to the air inlet cavity, the first partition is provided with a second through hole connected to the first cavity and the second cavity, the side wall of the explosion-proof shell is provided with a third through hole connected to the interior of the casing, the inner side wall of the casing is fixedly provided with a stator, and the output shaft is fixedly provided with a rotor, and the outside air is discharged through the air inlet, the air inlet cavity, the first through hole, the second through hole, the third through hole, the exhaust cavity and the exhaust port in sequence under the action of the auxiliary heat dissipation fan blades, which can control the flow direction of the gas and has a better heat dissipation effect on the casing.

[0009] In a preferred embodiment, the heat dissipation and explosion-proof mechanism includes a sealing partition and a sealing ring fixedly arranged inside the second cavity, a heat-conducting rod is provided through the sealing partition, the upper end of the heat-conducting rod is fixedly connected to the bottom end of the heat-conducting pipe, one end of the heat-conducting pipe passes through the side wall of the explosion-proof shell and is connected to the interior of the casing, the heat-conducting pipe is located at one end control panel inside the casing, the lower part of the second cavity is located between the sealing partition and the sealing ring and is filled with sodium bicarbonate particles, an exhaust port is provided at the sealing ring, the exhaust port is connected to a gas pipe, one end of the gas pipe is connected to the inner wall of the casing The second annular cavity, the inner side of the second annular cavity is evenly spaced with a plurality of nozzles, an explosion-proof buffer main air bag is provided above the interior of the second cavity, between the sealing partition and the sealing ring, and a plurality of buffer branch air bags are provided at the end of the explosion-proof buffer main air bag, and the buffer branch air bags are provided through the side wall of the explosion-proof shell. When the temperature inside the shell is high, the second cavity can be used to assist in heat dissipation, and if the air pressure inside the shell is high and an explosion occurs, the carbon dioxide generated in the second cavity can be sprayed inside the shell to reduce the oxygen content inside the shell, thereby reducing the generation of activation and reducing the occurrence of safety accidents.

[0010] In a preferred embodiment, the end of the heat pipe located inside the casing is made of insulating material, and the end of the heat pipe located inside the explosion-proof shell is made of conductive material. The heat pipe passes through the sealing ring, and the insulating material can prevent the transfer of heat so that heat can only flow out through the heat pipe channel.

[0011] In a preferred embodiment, a plurality of heat dissipation blocks are evenly spaced on the side wall of one end of the heat-conducting rod below the sealing partition, and the heat dissipation blocks on two adjacent heat-conducting rods are staggered. A one-way valve is provided inside the gas pipe. The arrangement of the heat dissipation blocks heats the sodium bicarbonate particles more evenly, making the sodium bicarbonate particles easier to decompose.

[0012] In a preferred embodiment, a through groove is provided through the middle of the control panel, a plurality of first air holes are evenly spaced on the control panel, a sealing plate is slidingly provided on the inner side of the through groove, a plurality of second air holes are evenly spaced on the sealing plate, the bottom end of the sealing plate is fixedly provided on the upper end of the movable plug, the movable plug is provided inside the temperature-sensing cylinder, the interior of the temperature-sensing cylinder is located below the movable plug and is filled with expansion gas, a reset spring is fixedly provided on the bottom end of the movable plug, and the setting of the control panel can automatically adjust the opening of the control panel according to the temperature inside the casing, so that the heat dissipation effect is better.

[0013] In a preferred embodiment, the temperature sensing display mechanism includes a lifting rod fixedly arranged on the upper end of the sealing plate, the upper end of the lifting rod is provided with a tooth groove, one side of the tooth groove is meshed with a gear, one end of the gear is fixedly provided at the input end of the reduction gearbox, the output end of the reduction gearbox is connected to a pointer through a connecting shaft, the outer surface of the explosion-proof shell is provided with a pointer scale, the temperature inside the shell is sensed by a temperature sensing tube, and the pointer indicates the pointer scale according to the real-time temperature, so that the user can understand the temperature inside the shell conveniently.

[0014] In a preferred embodiment, an installation cavity is provided on the outer wall of the explosion-proof housing, the pointer and pointer scale are both arranged inside the installation cavity, and a protective glass is provided on the outside of the installation cavity, which can protect the pointer and pointer scale.

[0015] In a preferred embodiment, a heat dissipation hole and an explosion-proof hole are provided on the side wall of the explosion-proof shell, the end of the buffer airbag is pasted inside the explosion-proof hole, and a plunger is provided at one end of the explosion-proof hole. The heat dissipation hole, the air inlet cavity and the exhaust cavity are all provided with a filter. The heat dissipation hole can assist in heat dissipation, and the explosion-proof hole can enable the buffer airbag to extend after expansion.

[0016] In a preferred embodiment, a first sealing gasket is provided between the support shaft and the explosion-proof housing, and a second sealing gasket is provided at the connection between the output shaft and the front end cover. The arrangement of the first sealing gasket and the second sealing gasket makes the sealing effect of the housing better.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention is provided with a heat dissipation explosion-proof mechanism, and an explosion-proof buffer airbag, sodium bicarbonate particles, heat-conducting rods, heat-conducting pipes and other structures are arranged inside the explosion-proof shell. Auxiliary heat dissipation fan blades are usually used for heat dissipation, so that the outside air flows through the shell and the explosion-proof shell according to a certain channel, so that the heat dissipation effect is better. When the temperature inside the shell is high, the heat can be transmitted to the inside of the explosion-proof shell through the heat-conducting pipe, and the heat dissipation holes on the side wall of the explosion-proof shell are used to assist in heat dissipation. In addition, the heat inside the explosion-proof shell can be transmitted to the sodium bicarbonate particles, which are decomposed by heat. The sodium bicarbonate particles are heated and decomposed. When the particles decompose, they can absorb heat and accelerate the heat dissipation efficiency of the casing. When an explosion occurs inside the casing, the internal air pressure and temperature increase rapidly. The air pressure can enter the explosion-proof casing and release pressure through the heat dissipation holes. In addition, the explosion-proof buffer airbag can play a buffering role and play an explosion buffering function. The heat transmitted by the heat pipe and the heat conducting rod can make the sodium bicarbonate particles decompose quickly. While lowering the temperature, the carbon dioxide generated by the decomposition is sprayed into the casing, which can reduce the oxygen content inside the casing and reduce the generation of sparks in the casing, which can effectively reduce the occurrence of safety accidents.

[0019] 2. The present invention provides a control panel at the end of the heat pipe and a sealing plate inside the control panel. The sealing plate is connected to a temperature-sensing display mechanism. The temperature-sensing tube senses the temperature inside the casing and the sealing plate slides inside the control panel according to the sensed temperature, thereby connecting and sealing the heat pipe. The movement of the sealing plate drives the operation of the temperature-sensing display mechanism, which can display the temperature inside the casing for easy viewing by the user.

[0020] 3. The present invention is provided with a temperature-sensing display mechanism, which utilizes the thermal expansion of the temperature-sensing tube to push the movement of the lifting rod. When the lifting rod moves, the pointer can be driven to rotate through the gear, and when the gear rotates, the direction and speed can be adjusted through the reduction gear box, so that the angle of rotation of the pointer can be adjusted according to the height of the lifting rod movement, which is convenient for the temperature pointer when the temperature inside the casing is high, and helps users understand the operating conditions inside the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] FIG1 is a schematic diagram of the overall structure of the present invention;

[0023] FIG2 is an enlarged schematic diagram of the structure at point A in FIG1 of the present invention;

[0024] FIG3 is a schematic cross-sectional view of the interior of the side wall of the housing of the present invention;

[0025] FIG4 is a schematic diagram of the internal structure of the temperature sensing tube of the present invention;

[0026] FIG5 is a side view schematic diagram of the heat pipe of the present invention;

[0027] FIG6 is a schematic diagram of the cross-sectional structure of the heat pipe of the present invention;

[0028] FIG7 is a schematic diagram of the installation structure of the pointer of the present invention;

[0029] FIG8 is a schematic structural diagram of the explosion-proof buffer total airbag of the present invention;

[0030] FIG2 is an enlarged schematic diagram of the structure at point B in FIG1 of the present invention.

[0031] In the figure: 1, housing; 2, front cover; 3, explosion-proof housing; 4, first partition; 5, first cavity; 6, second cavity; 7, auxiliary heat dissipation fan blade; 8, support shaft; 9, output shaft; 10, first annular cavity; 11, annular sealing plate; 12, air inlet cavity; 13, exhaust cavity; 14, air inlet; 15, exhaust port; 16, First through hole; 17. Second through hole; 18. Third through hole; 19. Stator; 20. Rotor; 21. Sealing baffle; 22. Heat-conducting rod; 23. Heat-conducting pipe; 24. Control board; 25. Sodium bicarbonate granules; 26. Sealing ring; 27. Gas pipe; 28. Second annular cavity; 29. ​​Nozzle; 30. Explosion-proof buffer main airbag; 31. Buffer branch airbag; 32. Heat dissipation block; 33. Through groove; 34. First air vent; 35. Sealing plate; 36. Second air vent; 37. Movable plug; 38. Temperature sensing tube; 39. Expansion gas; 40. Return spring; 41. Lifting rod; 42. Tooth groove; 43. Gear; 44. Reducer; 45. Pointer; 46. Pointer scale; 47. Mounting cavity; 48. Protective glass; 49. Heat dissipation hole; 50. Explosion-proof hole; 51. Plunger. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Please refer to Figures 1 to 6. The present invention provides a permanent magnet synchronous motor with an external explosion-proof mechanism, including a casing 1. A front end cover 2 is provided at the front end of the casing 1, and an explosion-proof shell 3 is provided at the rear end of the casing 1. The interior of the explosion-proof shell 3 is divided into a first cavity 5 and a second cavity 6 by a first partition 4. Auxiliary heat dissipation fan blades 7 are provided inside the first cavity 5, and the auxiliary heat dissipation fan blades 7 are fixedly provided on a support shaft 8. The support shaft 8 is keyed to the output shaft 9 inside the casing 1. A heat dissipation explosion-proof mechanism is provided inside the second cavity 6, and a high temperature display mechanism is provided on the outer side wall of the explosion-proof shell 3.

[0034] In a preferred embodiment, the inner wall of the casing 1 is provided with a first annular cavity 10, the interior of the first annular cavity 10 is divided into an air inlet cavity 12 and an exhaust cavity 13 by an annular sealing plate 11, one end of the air inlet cavity 12 is provided with an air inlet port 14, and one end of the exhaust cavity 13 is provided with an exhaust port 15, the side wall of the explosion-proof shell 3 is provided with a first through hole 16 communicating with the air inlet cavity 12, the first partition plate 4 is provided with a second through hole 17 communicating with the first cavity 5 and the second cavity 6, the side wall of the explosion-proof shell 3 is provided with a third through hole 18 communicating with the interior of the casing 1, the inner wall of the casing 1 is fixedly provided with a stator 19, and the output shaft 9 is fixedly provided with a rotor 20.

[0035] In specific use, the auxiliary heat dissipation fan blades 7 can draw outside air into the air inlet cavity 12 through the air inlet 14, and then enter the second cavity 6 inside the explosion-proof shell 3 through the first through hole 16, enter the first cavity 5 through the second through hole 17, and then enter the interior of the casing 1 through the third through hole 18. When passing through the gap between the stator 19 and the rotor 20, the heat is taken away and discharged through the exhaust cavity 13 and the exhaust port 15. The direction of air flow can be controlled so that it flows around the casing 1, resulting in better heat dissipation effect.

[0036] Please refer to Figures 2 to 5. In a preferred embodiment, the heat dissipation and explosion-proof mechanism includes a sealing partition 21 and a sealing ring 26 fixedly arranged inside the second cavity 6. A heat-conducting rod 22 is provided on the sealing partition 21. The upper end of the heat-conducting rod 22 is fixedly connected to the bottom end of the heat-conducting pipe 23. One end of the heat-conducting pipe 23 passes through the side wall of the explosion-proof shell 3 and is connected to the inside of the casing 1. The heat-conducting pipe 23 is located at one end of the control board 24 inside the casing 1. The lower part of the second cavity 6 is filled with carbonic acid between the sealing partition 21 and the sealing ring 26. Sodium hydrogen particles 25, an exhaust port is provided at the sealing ring 26, an air supply pipe 27 is connected to the exhaust port, one end of the air supply pipe 27 is connected to a second annular cavity 28 provided on the inner side wall of the casing 1, a plurality of nozzles 29 are evenly spaced on the inner side of the second annular cavity 28, an explosion-proof buffer main air bag 30 is provided above the interior of the second cavity 6, between the sealing partition 21 and the sealing ring 26, a plurality of buffer branch air bags 31 are provided at the end of the explosion-proof buffer main air bag 30, and the buffer branch air bags 31 are provided through the side wall of the explosion-proof shell 3.

[0037] During specific use, the heat pipe 23 can transfer the heat inside the casing 1 to the second cavity 6, and can use the heat dissipation holes 49 on the side wall of the explosion-proof shell 3 to assist in heat dissipation. When the temperature is not high, the heat dissipation holes 49 cannot be connected to the inside of the casing 1, reducing the outside air from entering the casing 1. The heat in the second cavity 6 can be transferred to the sodium bicarbonate particles 25 through the heat-conducting rod 22. The sodium bicarbonate particles 25 decompose when heated, and can absorb heat during the decomposition process, thereby accelerating the heat dissipation of the casing 1. Moreover, the carbon dioxide generated after the decomposition of the sodium bicarbonate particles 25 can be transported to the inside of the casing 1, which can reduce the oxygen content inside the casing 1 and reduce the generation of sparks inside the casing 1. Moreover, when an explosion occurs, the explosion-proof buffer airbag can buffer the air pressure generated by the explosion, and the second cavity 6 can also play a pressure relief role.

[0038] In a preferred embodiment, the end of the heat pipe 23 located inside the casing 1 is made of insulating material, and the end of the heat pipe 23 located inside the explosion-proof shell 2 is made of conductive material. The heat pipe 23 passes through the sealing ring 26. The end located inside the casing 1 is made of insulating material to prevent the heat inside the casing 1 from being transferred to the second cavity 6 during normal use, causing waste of sodium bicarbonate particles 25, while the end inside the explosion-proof shell 3 is made of conductive material to facilitate heat transfer and heat exchange with the heat-conducting rod 22.

[0039] In a preferred embodiment, a plurality of heat dissipation blocks 32 are evenly spaced apart on the side wall of one end of the heat-conducting rod 22 located below the sealing partition 21, and the heat dissipation blocks 32 on two adjacent heat-conducting rods 22 are staggered. A one-way valve is provided inside the gas pipe 27. The arrangement of the heat dissipation blocks 32 facilitates uniform heating of the sodium bicarbonate particles 25 and achieves a better decomposition effect.

[0040] In a preferred embodiment, a through groove 33 is provided in the middle of the control panel 24, and a plurality of first air holes 34 are evenly spaced on the control panel 24. A sealing plate 35 is slidingly provided on the inner side of the through groove 33, and a plurality of second air holes 36 are evenly spaced on the sealing plate 35. The bottom end of the sealing plate 35 is fixedly provided on the upper end of a movable plug 37, and the movable plug 37 is provided inside a temperature-sensing tube 38. The temperature-sensing tube 38 is located below the movable plug 37 and is filled with expansion gas 39. A reset spring 40 is fixedly provided on the bottom end of the movable plug 37. The staggered arrangement of the first air holes 34 and the second air holes 36 on the control panel 24 and the sealing plate 35 can realize the conduction and closure of the heat pipe 23, and can automatically adjust the opening of the heat pipe 23 according to the internal temperature of the casing 1.

[0041] For details, please refer to Figures 2 to 6. In a preferred embodiment, the temperature sensing display mechanism includes a lifting rod 41 fixedly arranged on the upper end of the sealing plate 35, and a tooth groove 42 is provided on the upper end of the lifting rod 41. A gear 43 is meshed with one side of the tooth groove 42, and one end of the gear 43 is fixedly arranged on the input end of the reduction gear box 44. The output end of the reduction gear box 44 is connected to a pointer 45 through a connecting shaft. The outer surface of the explosion-proof shell 3 is provided with a pointer scale 46. After the temperature sensing tube 38 senses the internal temperature of the casing 1, the expanded gas 39 expands to move the lifting rod 41 upward, thereby causing the gear 43 to rotate. When the gear 43 rotates, it can drive the reduction gear box 44 to operate. After the reduction gear box 44 adjusts the direction and speed, it drives the pointer 45 to indicate the scale.

[0042] In a preferred embodiment, an installation cavity 47 is provided on the outer wall of the explosion-proof shell 3, the pointer 45 and the pointer scale 46 are both arranged inside the installation cavity 47, and a protective glass 48 is provided on the outside of the installation cavity 47, which can protect the pointer 45 and the pointer scale 46.

[0043] In a preferred embodiment, a heat dissipation hole 49 and an explosion-proof hole 50 are provided on the side wall of the explosion-proof shell 3, the end of the buffer airbag 31 is pasted inside the explosion-proof hole 50, and a plunger 51 is provided at one end of the explosion-proof hole 50, and the heat dissipation hole 49, the air inlet cavity 12 and the exhaust cavity 13 are all provided with a filter screen, the heat dissipation hole 49 can assist in heat dissipation, and the explosion-proof hole 50 can enable the buffer airbag 31 to extend out of the explosion-proof shell 3 for pressure relief.

[0044] In a preferred embodiment, a first sealing gasket is provided between the support shaft 8 and the explosion-proof shell 3, and a second sealing gasket is provided at the connection between the output shaft 9 and the front end cover 2. The setting of the first sealing gasket and the second sealing gasket makes the sealing effect of the casing 1 better.

[0045] In specific use, during normal operation, the rotor 20 rotates under the magnetic force of the stator 19, so that the rotor 19 drives the output shaft 9 and the auxiliary heat dissipation fan blades 7 to rotate. When the auxiliary heat dissipation fan blades 7 rotate, negative pressure can be generated inside the first cavity 5, so that the outside air enters the air intake cavity 12 through the air inlet 14, and then enters the second cavity 6 through the first through hole 16, enters the first cavity 5 through the second through hole 17, and enters the interior of the casing 1 through the third through hole 18. When the air passes through the gap between the stator 19 and the rotor 20, it takes away the heat, so that the heat inside the casing 1 enters the exhaust cavity 13, and then is discharged through the exhaust port 15. A one-way valve is provided at the exhaust port 15 to facilitate better control of the gas flow direction. The outside air passes through the air intake cavity 12, the second cavity 6, the first cavity 5, the interior of the casing 1 and the exhaust cavity 13 in turn, so that the flowing air has a better contact effect with the casing 1 and the explosion-proof shell 3, and has a better heat dissipation effect.

[0046] If the temperature inside the casing 1 is high, the expanded gas 39 inside the temperature-sensing tube 38 expands due to the heat, and the expanded gas 39 will push the movable plug 37 to move upward. When the movable plug 37 moves, it can drive the blocking plate 35 to move, so that the second air vent 36 on the blocking plate 35 coincides with the first air vent 34 on the control board 24, thereby making the heat pipe 23 conductive, and the heat inside the casing 1 can enter the second cavity 6 inside the explosion-proof shell 3 through the heat pipe 23. The heat dissipation holes 49 on the outer wall of the explosion-proof shell 3 can assist in heat dissipation, and one end of the heat pipe 23 is made of heat-conducting material. The heat pipe 23 can transfer heat to the heat-conducting rod 22, and the heat-conducting rod 22 can heat the sodium bicarbonate particles 25 under the sealing partition 21. The sodium bicarbonate particles 25 decompose after being heated, and can absorb during the decomposition process. Heat is absorbed and carbon dioxide is generated. The decomposition of the sodium bicarbonate particles 25 can absorb the heat inside the casing 1, thereby improving the heat dissipation efficiency of the equipment. The carbon dioxide generated by the decomposition can enter the second annular cavity 28 through the gas pipe 27, and then be sprayed into the interior of the casing 1 through the nozzle 29. Since the temperature of the carbon dioxide is relatively low, it can dissipate heat inside the casing 1. In the process of the blocking plate 35 moving upward, the blocking plate 35 can drive the lifting rod 41 to move. When the lifting rod 41 moves, the tooth groove 42 on the outer side thereof engages with the gear 43, which can drive the gear 3 to rotate. The gear 3 can make the reduction gear 44 run. After the reduction gear 44 changes the speed and direction of the gear 3, it can drive the pointer 45 to deflect by a certain angle, so that the pointer 45 points to the pointer scale 46, which is convenient for the user to check the temperature inside the casing 1;

[0047] If an explosion occurs inside the casing 1, the interior of the casing 1 will rise instantly, the heat pipe 23 will open quickly, and the air pressure inside the casing 1 will enter the second cavity 6 and then be able to dissipate through the heat dissipation holes 49, while the excess gas will enter the explosion-proof buffer main airbag 30 and expand the explosion-proof buffer main airbag 30 and the buffer branch airbag 31. The buffer branch airbag 31 can push out the plunger inside the explosion-proof hole 50 and extend from the inside of the explosion-proof hole 50, which can play an explosion-proof buffering effect. The high temperature can make the sodium bicarbonate particles 25 decompose quickly. While absorbing heat to assist in heat dissipation, the carbon dioxide generated by the decomposition enters the interior of the casing 1 and is sprayed toward the stator 19 and the rotor 20, so that the interior of the casing 1 contains more carbon dioxide gas, reducing the oxygen content, thereby reducing the generation of sparks inside the casing 1 and improving the safety of the equipment during use.

[0048] Please refer to Figures 1 to 6. The present invention is provided with a heat dissipation explosion-proof mechanism, and an explosion-proof buffer airbag, sodium bicarbonate particles, heat-conducting rods, heat-conducting pipes and other structures are arranged inside the explosion-proof shell. Auxiliary heat dissipation fan blades are usually used for heat dissipation, so that the outside air flows through the shell and the explosion-proof shell according to a certain channel, so that the heat dissipation effect is better. When the temperature inside the shell is high, the heat can be transferred to the inside of the explosion-proof shell through the heat-conducting pipe, and the heat dissipation holes on the side wall of the explosion-proof shell are used to assist in heat dissipation. In addition, the heat inside the explosion-proof shell can be transferred to the sodium bicarbonate particles, which are decomposed by heat, and the carbonic acid When sodium bicarbonate particles decompose, they can absorb heat and accelerate the heat dissipation efficiency of the casing. When an explosion occurs inside the casing, the internal air pressure and temperature increase rapidly. The air pressure can enter the explosion-proof casing and release pressure through the heat dissipation holes. In addition, the explosion-proof buffer airbag can play a buffering role and play an explosion buffering function. The heat transmitted by the heat pipe and the heat conducting rod can make the sodium bicarbonate particles decompose quickly. While lowering the temperature, the carbon dioxide generated by the decomposition is sprayed into the casing, which can reduce the oxygen content inside the casing and reduce the generation of sparks in the casing, which can effectively reduce the occurrence of safety accidents.

[0049] Referring to Figures 1 to 6 , the present invention provides a control panel at the end of the heat pipe and a blocking plate inside the control panel. The blocking plate is connected to a temperature-sensing display mechanism. A temperature-sensing tube senses the temperature inside the housing and the blocking plate slides inside the control panel according to the sensed temperature, thereby connecting and sealing the heat pipe. Furthermore, the movement of the blocking plate drives the operation of the temperature-sensing display mechanism, which can display the temperature inside the housing for easy viewing by the user.

[0050] Please refer to Figures 1 to 6. The present invention is equipped with a temperature-sensing display mechanism, which uses the thermal expansion of the temperature-sensing tube to drive the movement of the lifting rod. When the lifting rod moves, the pointer can be driven to rotate through the gear. When the gear rotates, the direction and speed can be adjusted through the reduction gear box, so that the angle of rotation of the pointer can be adjusted according to the height of the lifting rod movement, which is convenient for indicating the temperature pointer when the temperature inside the casing is high, and helps users understand the operating conditions inside the casing.

[0051] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A permanent magnet synchronous motor with an external explosion-proof mechanism, comprising a casing (1), a front end cover (2) being provided at the front end of the casing (1), and an explosion-proof housing (3) being provided at the rear end of the casing (1), characterized in that: The interior of the explosion-proof housing (3) is divided into a first cavity (5) and a second cavity (6) by a first partition plate (4); an auxiliary heat dissipation fan blade (7) is arranged inside the first cavity (5); the auxiliary heat dissipation fan blade (7) is fixedly arranged on a support shaft (8); the support shaft (8) is key-connected to an output shaft (9) inside the housing (1); a heat dissipation explosion-proof mechanism is arranged inside the second cavity (6); and a high temperature display mechanism is arranged on the outer end side wall of the explosion-proof housing (3).

2. The permanent magnet synchronous motor with an external explosion-proof mechanism according to claim 1, characterized in that: The inner wall of the casing (1) is provided with a first annular cavity (10), the interior of the first annular cavity (10) is divided into an air intake cavity (12) and an air exhaust cavity (13) by an annular sealing plate (11), one end of the air intake cavity (12) is provided with an air intake port (14), and one end of the air exhaust cavity (13) is provided with an air exhaust port (15), the side wall of the explosion-proof shell (3) is provided with a first through hole (16) communicating with the air intake cavity (12), the first partition plate (4) is provided with a second through hole (17) communicating with the first cavity (5) and the second cavity (6), the side wall of the explosion-proof shell (3) is provided with a third through hole (18) communicating with the interior of the casing (1), the inner wall of the casing (1) is fixedly provided with a stator (19), and the output shaft (9) is fixedly provided with a rotor (20).

3. The permanent magnet synchronous motor with an external explosion-proof mechanism according to claim 2, characterized in that: The heat dissipation explosion-proof mechanism comprises a sealing baffle (21) and a sealing ring (26) fixedly arranged inside the second cavity (6); a heat-conducting rod (22) is provided through the sealing baffle (21); the upper end of the heat-conducting rod (22) is fixedly connected to the bottom end of a heat-conducting pipe (23); one end of the heat-conducting pipe (23) passes through the side wall of the explosion-proof shell (3) and communicates with the inside of the casing (1); one end of the heat-conducting pipe (23) is located inside the casing (1) and is connected to a control panel (24); the lower part of the second cavity (6) is filled with sodium bicarbonate particles (25) between the sealing baffle (21) and the sealing ring (26); The sealing ring (26) is provided with an exhaust port, and the exhaust port is connected to an air supply pipe (27). One end of the air supply pipe (27) is connected to a second annular cavity (28) provided on the inner wall of the casing (1). A plurality of nozzles (29) are evenly spaced inside the second annular cavity (28). An explosion-proof buffer main airbag (30) is provided above the inside of the second cavity (6) between the sealing partition (21) and the sealing ring (26). A plurality of buffer branch airbags (31) are provided at the end of the explosion-proof buffer main airbag (30). The buffer branch airbags (31) are provided through the side wall of the explosion-proof casing (3).

4. The permanent magnet synchronous motor with an external explosion-proof mechanism according to claim 3, characterized in that: The end of the heat conducting pipe (23) located inside the casing (1) is made of heat insulating material, the end of the heat conducting pipe (23) located inside the explosion-proof housing (2) is made of heat conducting material, and the heat conducting pipe (23) is arranged to penetrate the sealing ring (26).

5. The permanent magnet synchronous motor with an external explosion-proof mechanism according to claim 3, characterized in that: A plurality of heat dissipation blocks (32) are evenly spaced on the side wall of one end of the heat-conducting rod (22) located below the sealing partition (21), and the heat dissipation blocks (32) on two adjacent heat-conducting rods (22) are staggered, and a one-way valve is arranged inside the gas delivery pipe (27).

6. The permanent magnet synchronous motor with an external explosion-proof mechanism according to claim 3, characterized in that: A through groove (33) is provided in the middle of the control plate (24), a plurality of first air holes (34) are evenly spaced on the control plate (24), a blocking plate (35) is slidably provided inside the through groove (33), a plurality of second air holes (36) are evenly spaced on the blocking plate (35), the bottom end of the blocking plate (35) is fixedly provided on the upper end of a movable plug (37), the movable plug (37) is provided inside a temperature sensing tube (38), the inside of the temperature sensing tube (38) below the movable plug (37) is filled with expansion gas (39), and a return spring (40) is fixedly provided at the bottom end of the movable plug (37).

7. The permanent magnet synchronous motor with an external explosion-proof mechanism according to claim 6, characterized in that: The temperature sensing display mechanism comprises a lifting rod (41) fixedly arranged on the upper end of the blocking plate (35), a tooth groove (42) is arranged on the upper end of the lifting rod (41), a gear (43) is meshedly arranged on one side of the tooth groove (42), one end of the gear (43) is fixedly arranged on the input end of the reduction box (44), the output end of the reduction box (44) is connected to a pointer (45) via a connecting shaft, and a pointer scale (46) is arranged on the outer surface of the explosion-proof shell (3).

8. The permanent magnet synchronous motor with an external explosion-proof mechanism according to claim 7, characterized in that: The outer wall of the explosion-proof housing (3) is provided with an installation cavity (47), the pointer (45) and the pointer scale (46) are both arranged inside the installation cavity (47), and a protective glass (48) is arranged outside the installation cavity (47).

9. The permanent magnet synchronous motor with an external explosion-proof mechanism according to claim 3, characterized in that: The side wall of the explosion-proof housing (3) is provided with a heat dissipation hole (49) and an explosion-proof hole (50); the end of the buffer airbag (31) is pasted inside the explosion-proof hole (50); a plunger (51) is provided at one end of the explosion-proof hole (50); and filter screens are provided at the heat dissipation hole (49), the air inlet cavity (12) and the air outlet cavity (13).

10. The permanent magnet synchronous motor with an external explosion-proof mechanism according to claim 1, characterized in that: A first sealing gasket is provided between the support shaft (8) and the explosion-proof housing (3), and a second sealing gasket is provided at the connection between the output shaft (9) and the front end cover (2).

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