Explosion-proof motor for underground coal mine

Abstract

The invention discloses an explosion-proof motor for an underground coal mine, and relates to the technical field of explosion-proof motors, and the explosion-proof motor comprises a housing, the outer wall of the housing is fixedly connected with a plurality of short fins at equal intervals, the inner wall of the housing is fixedly connected with a stator around the circumference, and the inner wall of the center of the housing is rotatably connected with a rotating shaft. Through vertical separation of the flow guide plate and flow guide of concave arc faces on the two sides, the resistance of hot air shunting to the two sides can be reduced, after the hot air enters the ventilation cavity, the heat dissipation area is increased under the flat arrangement of the hot air, and heat on the surface of the ventilation cavity is rapidly guided out through cooperation of the unfolded first fins, the unfolded second fins and the unfolded third fins, so that the heat dissipation efficiency is improved. The temperature exchange rate can be increased through double heat conduction, hot air in the ventilation cavity can be rapidly cooled, airflow and temperature on the two sides can be balanced, the stability of the system is improved, the equipment temperature can be reduced through good heat dissipation, and electric sparks caused by overheating are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of flameproof motors, in particular to flameproof motors used in underground coal mines. Background Art

[0002] Flameproof motors are a special type of motor design, mainly used in places with explosive gas environments, such as underground coal mines. The design principle is to prevent sparks or high-temperature gases from leaking out when an electrical fault occurs inside the motor housing, and avoid contact with flammable gases in the external environment, thereby preventing explosions. In the prior art, when designing explosion-proof motors, thickened housings and sealing structures are usually used to enhance their explosion-proof performance and ensure safe operation in flammable and explosive environments. However, while this design improves the explosion-proof effect, it may also have an adverse effect on the heat dissipation performance of the motor. During the operation of the motor, a certain amount of heat will be generated inside. If the housing is thickened and sealed, the heat is difficult to dissipate effectively, which may cause the temperature inside the motor to rise. Long-term high-temperature operation will not only accelerate the aging of the insulating materials in the motor, but may also cause electrical failures, such as insulation breakdown, and then generate electric sparks. Once such electric sparks ignite the surrounding flammable materials, they may cause combustion accidents and cause serious consequences. In addition, the motor casing is designed with thickened materials and sealed structures. Although this improves the explosion-proof performance of the motor, it also brings many adverse effects. First, the thickened materials and sealed structure significantly increase the overall weight of the motor, which not only increases the difficulty during transportation, but also increases the complexity of installation. Secondly, due to the material cost and the complexity of the processing technology, the manufacturing cost of explosion-proof motors is usually much higher than that of ordinary motors. These factors combined may significantly increase the operating costs of coal mines.

[0003] In view of this, the present invention proposes a flameproof motor for underground coal mines to make up for and improve the deficiencies of the prior art. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a flameproof motor for use in underground coal mines, which can reduce the temperature of equipment, increase the adaptability of the motor in different environments, and avoid the increase of the operating cost of the coal mine, so as to solve the corresponding technical problems raised in the above background technology.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is: a flameproof motor for underground coal mines, comprising a casing, a plurality of short fins are fixedly connected to the outer wall of the casing at equal intervals, a stator is fixedly connected to the inner wall of the casing around the circumference, a rotating shaft is rotatably connected to the inner wall at the center of the casing, a rotor coil is fixedly connected to the middle of the rotating shaft, a junction box is fixedly connected to the top of the rotating shaft, and also includes: Double-circulation temperature exchange mechanism, used to separate the air inside the shaft from both sides and circulate it; Explosion-proof mechanism, used to warn of electrical faults inside the shaft and extinguish sparks in time.

[0006] Preferably, the dual-circulation temperature exchange mechanism includes a ventilation cavity fixedly connected to the outer walls on both sides of the rotating shaft, the inner walls of the two ventilation cavities are fixedly connected to the short fins, the outer walls of the ventilation cavity are equidistantly fixedly connected with a plurality of first fins, the bottoms of the plurality of first fins are slidably connected with the second fins, the bottoms of the plurality of second fins are slidably connected with the plurality of third fins, the inner walls at the edges of the third fins on both sides are fixedly connected with L-shaped rods, the two L-shaped rods rotate and penetrate the edges of the first fins and the second fins respectively, the bottoms of the L-shaped rods are rotatably connected with support plates, and the side of the support plate away from the L-shaped rods is fixedly connected to the outer wall of the casing.

[0007] Preferably, the dual-circulation temperature exchange mechanism also includes a fixed pile fixedly connected to the top of the ventilation chamber, the tops of the two fixed piles are fixedly connected with connecting ropes, the ends of the two connecting ropes away from the fixed piles are fixedly connected with clamps, and a pair of limiting rings are fixedly connected at the bending part of the top of the L-shaped rod, and the bent end of the L-shaped rod is arranged parallel to the third fin.

[0008] Preferably, the dual-circulation temperature exchange mechanism also includes a baffle fixedly connected to the edge of the inner wall of the rotating shaft, a fan blade is fixedly connected to the edge of the rotating shaft, the fan blade is located on the side of the baffle away from the rotor coil, and a guide plate is rotated through the side of the rotating shaft close to the fan blade, the two sides of the guide plate are respectively fixedly connected to the rotating shaft and the baffle, the fan blade passes through the middle of the guide plate, and air flow holes are opened at the four corners of the inner wall of the rotating shaft.

[0009] Preferably, the explosion-proof mechanism includes an insulating seat fixedly connected to the top edge of the casing, a small dry powder fire extinguishing tank is clamped on the inner wall of the insulating seat, the top of the small dry powder fire extinguishing tank is fixedly connected with a connecting pipe, the side of the connecting pipe away from the small dry powder fire extinguishing tank is detachably connected with a valve seat, the valve seat is fixedly connected to the inner wall of the casing, the bottom of the valve seat is fixedly connected with a nozzle, the side of the nozzle away from the valve seat passes through the inner wall of the casing, and the side of the nozzle away from the valve seat is arranged toward the middle of the casing.

[0010] Preferably, the explosion-proof mechanism further comprises a spark detector fixedly connected to the inner wall of the bottom of the junction box, an alarm is fixedly connected to the outer wall of the bottom of the junction box, and the alarm and the spark detector are electrically connected to each other.

[0011] Preferably, the inner diameter of the clamping ring is consistent with the outer diameter of the limiting ring.

[0012] Preferably, the baffle is arranged in a ring shape and the inner diameter thereof is consistent with the outer diameter of the fan blade.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. When the motor is working, through the setting of the double-circulation temperature exchange mechanism, the fan blades rotate to continuously extract the air heated by the rotor coil when it is working from the middle of the baffle. Through the vertical separation of the guide plate and the concave arc guide on both sides, the resistance of the hot air to the two sides can be reduced, thereby avoiding the flow rate from decreasing and ensuring the heat exchange efficiency. After the hot air enters the ventilation cavity, its flat setting increases the heat dissipation area, and the unfolded first fin, second fin and third fin are used to quickly extract the heat on the surface of the ventilation cavity. Double heat conduction can enhance the rate of temperature exchange, so that the hot air in the ventilation cavity is quickly cooled down, and finally enters the inner wall of the casing again to complete an airflow cycle. In this way, the airflow performs double-circulation temperature exchange on both sides of the casing, so that the heat energy is lost more fully, and it also helps to balance the airflow and temperature on both sides, improve the stability of the system, and good heat dissipation can also reduce the temperature of the equipment and reduce the electric sparks caused by overheating; 2. By setting the L-shaped rod, a clamp ring is used to change the state of the L-shaped rod to rotate, thereby driving the third fin to rotate, flatten or fold, and finally the three fins can be folded and folded, or flattened into a fan shape, which is equivalent to changing the pitch of the first fin, so that when the heat on the ventilation cavity is transferred to the first fin, it will continue to expand and transfer to the second and third fins, increasing the heat dissipation area, thereby increasing the heat exchange rate of the ventilation cavity, further improving the heat dissipation effect, and whether to accelerate the heat dissipation can be manually controlled, which increases the adaptability of the motor in different environments; 3. When an electrical fault occurs, through the setting of the explosion-proof mechanism, the staff first manually opens the valve seat, and then extinguishes the possible open flame through a small dry powder fire extinguisher. Since the nozzle is located in the internal space of the casing, the fire can be quickly extinguished without opening the equipment, avoiding high-temperature open flames from being exposed to the air under the mine, increasing the explosion-proof effect of the equipment, and the cycle from the occurrence of the fault to the safe fire extinguishing can be controlled in a shorter time. Therefore, the motor casing does not need to be excessively thickened, thereby reducing the weight of the equipment and facilitating transportation and installation. At the same time, reducing the use of thickened materials can also reduce production costs, thereby avoiding an increase in the operating costs of coal mines. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment of the present invention; Figure 2 It is a schematic diagram of a side-view stereoscopic structure of the present invention; Figure 3 The present invention shows Figure 2 The enlarged structural diagram at B in the middle; Figure 4 It is a longitudinal stereoscopic cross-sectional view of the present invention; Figure 5 It is a transverse three-dimensional cross-sectional view of the present invention; Figure 6 The present invention shows Figure 5 The enlarged structural diagram at C in the middle; Figure 7 The present invention shows Figure 1 The enlarged structural diagram at A in the middle; Figure 8 It is a partial three-dimensional cross-sectional view shown in the present invention.

[0015] The numbers in the figure are: 1. Rotating shaft; 2. Casing; 3. Junction box; 4. Short fins; 5. Stator; 6. Rotor coil; 7. Double-circulation temperature exchange mechanism; 71. Ventilation cavity; 72. L-shaped rod; 73. First fin; 74. Second fin; 75. Third fin; 76. Support plate; 77. Clamp; 78. Connecting rope; 79. Fixing pile; 710. Fan blade; 711. Airflow hole; 712. Baffle; 713. Guide plate; 714. Limiting ring; 8. Explosion-proof mechanism; 81. Alarm; 82. Small dry powder fire extinguisher tank; 83. Insulation seat; 84. Valve seat; 85. Connecting pipe; 86. Nozzle; 87. Spark detector. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0017] Embodiments of the present invention Please refer to Figures 1 to 8 As shown, the flameproof motor for underground coal mines includes a casing 2, a plurality of short fins 4 are fixedly connected to the outer wall of the casing 2 at equal intervals, a stator 5 is fixedly connected to the inner wall of the casing 2 around the circumference, a rotating shaft 1 is rotatably connected to the inner wall of the center of the casing 2, a rotor coil 6 is fixedly connected to the middle of the rotating shaft 1, and a terminal box 3 is fixedly connected to the top of the rotating shaft 1, and also includes: A double-circulation temperature exchange mechanism 7 is used to separate the air inside the rotating shaft 1 from both sides and circulate it; The explosion-proof mechanism 8 is used to warn of electrical faults inside the rotating shaft 1 and to extinguish sparks in time; The dual-circulation temperature exchange mechanism 7 includes a ventilation cavity 71 fixedly connected to the outer walls of both sides of the rotating shaft 1, the inner walls of the two ventilation cavities 71 are fixedly connected to the short fins 4, the outer walls of the ventilation cavity 71 are fixedly connected with a plurality of first fins 73 at equal intervals, the bottoms of the plurality of first fins 73 are slidably connected with second fins 74, the bottoms of the plurality of second fins 74 are slidably connected with a plurality of third fins 75, the inner walls at the edges of the third fins 75 on both sides are fixedly connected with L-shaped rods 72, the two L-shaped rods 72 rotate and penetrate the edges of the first fins 73 and the second fins 74 respectively, the bottoms of the L-shaped rods 72 are rotatably connected with support plates 76, and the side of the support plates 76 away from the L-shaped rods 72 is fixedly connected to the outer wall of the casing 2; The dual-circulation temperature exchange mechanism 7 also includes a fixed pile 79 fixedly connected to the top of the ventilation cavity 71, and the tops of the two fixed piles 79 are fixedly connected with a connecting rope 78, and the ends of the two connecting ropes 78 away from the fixed piles 79 are fixedly connected with a clamping ring 77, and a pair of limiting rings 714 are fixedly connected to the bending part of the top of the L-shaped rod 72, and the bending end of the L-shaped rod 72 is arranged parallel to the third fin 75; The dual-circulation temperature exchange mechanism 7 also includes a baffle 712 fixedly connected to the edge of the inner wall of the rotating shaft 1, a fan blade 710 is fixedly connected to the edge of the rotating shaft 1, and the fan blade 710 is located on the side of the baffle 712 away from the rotor coil 6. A guide plate 713 is rotated and penetrated on the side of the rotating shaft 1 close to the fan blade 710. The two sides of the guide plate 713 are respectively fixedly connected to the rotating shaft 1 and the baffle 712. The fan blade 710 penetrates the middle of the guide plate 713, and air flow holes 711 are opened at the four corners of the inner wall of the rotating shaft 1; The inner diameter of the snap ring 77 is consistent with the outer diameter of the limit ring 714; The baffle 712 is arranged in an annular shape and its inner diameter is consistent with the outer diameter of the fan blade 710; Among them: the ventilation cavity 71 is arranged flat along the outer wall of the casing 2, the air flow holes 711 are used to connect the ventilation cavity 71 and the inner cavity of the rotating shaft 1, the first fin 73, the second fin 74 and the third fin 75 are fan-shaped after sliding and unfolding, and multiple first fins 73 are vertically fixed to the ventilation cavity 71, and the side of the guide plate 713 away from the baffle 712 is set to a concave arc surface for increasing the air flow rate.

[0018] The effects achieved by this embodiment are as follows: In the prior art, if the outer shell is thickened and sealed, it is difficult to dissipate the heat effectively, which may cause the temperature inside the motor to rise. Long-term high-temperature operation will not only accelerate the aging of the insulating material in the motor, but may also cause electrical failures, such as insulation breakdown, and then generate electric sparks. Once such electric sparks ignite the surrounding flammable materials, they may cause combustion accidents and cause serious consequences. Compared with the prior art, through the implementation of this embodiment, the dual-circulation temperature exchange mechanism 7 can reduce the resistance of the hot air to the two sides through the vertical separation of the guide plate 713 and the concave arc surface diversion on both sides, thereby avoiding the flow rate from being reduced and ensuring the heat exchange efficiency. After the hot air enters the ventilation cavity 71, its flat setting increases the heat dissipation area, and the unfolded first fin 73, the second fin 74 and the third fin 75 cooperate to quickly extract the heat from the surface of the ventilation cavity 71. The double heat conduction can enhance the rate of temperature exchange, so that the hot air in the ventilation cavity 71 is quickly cooled.

[0019] Further examples: Please refer to Figure 1 , Figure 2 , Figure 7 , Figure 8 As shown, the explosion-proof mechanism 8 includes a heat-insulating seat 83 fixedly connected to the top edge of the casing 2, a small dry powder fire extinguishing tank 82 is clamped on the inner wall of the heat-insulating seat 83, a connecting pipe 85 is fixedly connected to the top of the small dry powder fire extinguishing tank 82, a valve seat 84 is detachably connected to the side of the connecting pipe 85 away from the small dry powder fire extinguishing tank 82, the valve seat 84 is fixedly connected to the inner wall of the casing 2, a nozzle 86 is fixedly connected to the bottom of the valve seat 84, a side of the nozzle 86 away from the valve seat 84 penetrates the inner wall of the casing 2, and a side of the nozzle 86 away from the valve seat 84 is arranged toward the middle of the casing 2; The explosion-proof mechanism 8 also includes a spark detector 87 fixedly connected to the inner wall of the bottom of the junction box 3, and an alarm 81 is fixedly connected to the outer wall of the bottom of the junction box 3. The alarm 81 and the spark detector 87 are electrically connected to each other; The valve inside the valve seat 84 is set to be opened manually to avoid electrical failure, and the heat insulation seat 83 is set to be made of ceramic material to prevent the housing 2 from transferring heat to the small dry powder fire extinguishing tank 82.

[0020] The effects achieved by this embodiment are as follows: In the prior art, the thickened materials and sealing structure significantly increase the overall weight of the motor, which not only increases the difficulty during transportation, but also increases the complexity of installation. Secondly, due to the material cost and the complexity of the processing technology, the manufacturing cost of the explosion-proof motor is usually much higher than that of an ordinary motor. These factors combined may significantly increase the operating cost of a coal mine. Compared with the prior art, through the implementation of this embodiment, an explosion-proof mechanism 8 is set up to quickly extinguish the fire without opening the equipment, thereby avoiding high-temperature open flames from being exposed to the air under the mine, increasing the explosion-proof effect of the equipment, and the cycle from the occurrence of a fault to safe fire extinguishing can be controlled within a shorter time. Therefore, the motor casing 2 does not need to be excessively thickened, thereby reducing the weight of the equipment and facilitating transportation and installation. At the same time, reducing the use of thickened materials can also reduce production costs.

[0021] The complete usage steps and working principle of the above embodiment are as follows: In the initial state: the second fin 74 and the third fin 75 are in a folded state and are parallel to the first fin 73, and the L-shaped rod 72 and the clamping ring 77 are in a mutually sleeved state.

[0022] When the locking cam 75 is in the unlocked position, the two locking cams 72 will be locked and the locking cam 73 will be locked. When the heat is transferred to the first fin 73, it will continue to transfer to the second fin 74 and the third fin 75, thereby increasing the heat dissipation area and improving the heat dissipation effect. In addition, since the first fin 73 is vertically fixed to the ventilation cavity 71, and the inner wall of the ventilation cavity 71 is fixed to the short fin 4, that is, the ventilation cavity 71 is arranged in an arc shape along the outer wall of the casing 2, the first fin 73 is inclined relative to the terminal box 3, and the second fin 74 and the third fin 75 at the bottom of the first fin 73 are inclined along the angle of the first fin 73, and the L-shaped rod 72 rotated vertically on the inner wall of the first fin 73 is also inclined. In this way, after the second fin 74 and the third fin 75 are fan-shaped, the L-shaped rod 72, the second fin 74 and the third fin 75 are all maintained in the current expanded state under the action of gravity, so as to improve the heat dissipation efficiency of the ventilation cavity 71; Furthermore, when the motor is working, the shaft 1 and the rotor coil 6 are in a fast rotating state, so the fan blade 710 can be driven to rotate. Since the baffle 712 is arranged in an annular shape and the inner diameter size is consistent with the outer diameter size of the fan blade 710, and the fan blade 710 is located on the side of the baffle 712 away from the rotor coil 6, the rotation of the fan blade 710 can continuously extract the air heated by the rotor coil 6 when the rotor coil 6 is working from the middle part of the baffle 712, and transfer it to the side of the fan blade 710 away from the rotor coil 6, and pass through the guide plate 713. The vertical separation and the concave arc guide on both sides can reduce the resistance of the hot air to be diverted to both sides, thereby avoiding the reduction of the flow rate. After the hot air is diverted by the guide plate 713, it can enter the ventilation cavity 71 on both sides through the air flow hole 711. Since the temperature in the coal mine is usually low, the heat of the hot air in the ventilation cavity 71 is constantly exchanged with the external cold air. The heat dissipation area is increased mainly by the flat setting of the ventilation cavity 71 itself, and the first fin 73, the second fin 74 and the third fin 75 are deployed in combination. The fins 75 quickly conduct heat from the surface of the ventilation cavity 71, and the double heat conduction further enhances the rate of temperature exchange, so that the hot air in the ventilation cavity 71 is quickly cooled down. Under the rotation of the fan blades 710, the air in the casing 2 is continuously made to flow in the direction of the fan blades 710. The cooled air in the ventilation cavity 71 will flow along the ventilation cavity 71 in the direction away from the fan blades 710, and then pass through the other two air flow holes 711 away from the fan blades 710 to the inner wall of the casing 2 again, thus completing an air flow cycle. Because the guide plate 713 divides the air in the casing 2 into two sides each time, a double-cycle temperature exchange of the air flow is performed, so that the heat energy is more fully lost, and it is also helpful to balance the air flow and temperature on both sides, thereby improving the stability of the system. After the temperature of the equipment is reduced, electrical faults caused by overheating can be effectively reduced. At the same time, when the output power of the motor is large, by spreading the second fins 74 and the third fins 75 in a fan shape, the heat dissipation can be effectively enhanced to adapt to the use of the motor in different environments. Please refer to the above working process Figures 1 to 6 .

[0023] Furthermore, when the equipment is working, if an electrical fault occurs and sparks are generated, the spark detector 87 is used to transmit the detection signal to the alarm 81 in the first time, and the alarm 81 reminds the nearby staff of the equipment fault. At this time, the general equipment automatically cuts off the power for protection, but the generated sparks are likely to burn the line and cause open flames. The equipment cannot be opened to extinguish the fire in the mine, so the staff can manually open the valve seat 84, then pull out the safety pin of the small dry powder fire extinguisher tank 82, press and spray the dry powder, and spray it into the internal space of the casing 2 through the nozzle 86, so as to quickly extinguish the fire without opening the equipment, avoid high-temperature open flames from being exposed to the air in the mine, increase the explosion-proof effect of the equipment, and the cycle from the occurrence of the fault to the safe fire extinguishing can be controlled in a shorter time, so the casing 2 of the motor does not need to be excessively thickened, thereby reducing the weight of the equipment and facilitating transportation and installation. In addition, the connecting pipe 85 and the valve seat 84 can be detachably installed, and a new small dry powder fire extinguisher tank 82 can be replaced after the equipment is repaired, which is convenient for next use; Please refer to the above working process Figure 1 to Figure 2 , Figures 7 and 8 .

[0024] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flameproof motor for use in underground coal mines, comprising a housing (2), characterized in that: The outer wall of the housing (2) is fixedly connected with a plurality of short fins (4) at equal intervals, the inner wall of the housing (2) is fixedly connected with a stator (5) around the circumference, the inner wall at the center of the housing (2) is rotatably connected with a rotating shaft (1), the middle of the rotating shaft (1) is fixedly connected with a rotor coil (6), and the top of the rotating shaft (1) is fixedly connected with a terminal box (3), and further comprises: A double-circulation temperature exchange mechanism (7) is used to separate the air inside the rotating shaft (1) from two sides and circulate it; The explosion-proof mechanism (8) is used to warn of electrical faults occurring inside the rotating shaft (1) and to extinguish sparks in a timely manner.

2. The flameproof motor for underground coal mine according to claim 1, characterized in that: The dual-circulation temperature exchange mechanism (7) comprises a ventilation cavity (71) fixedly connected to the outer walls on both sides of the rotating shaft (1); the inner walls of the two ventilation cavities (71) are fixedly connected to the short fins (4); the outer walls of the ventilation cavity (71) are fixedly connected to a plurality of first fins (73) at equal intervals; the bottoms of the plurality of first fins (73) are slidably connected to the second fins (74); the bottoms of the plurality of second fins (74) are slidably connected to the plurality of third fins (75); the inner walls at the edges of the third fins (75) on both sides are fixedly connected to L-shaped rods (72); the two L-shaped rods (72) are respectively rotatably connected to the edges of the first fins (73) and the second fins (74); the bottoms of the L-shaped rods (72) are rotatably connected to support plates (76); the support plates (76) are fixedly connected to the outer wall of the casing (2) at a side away from the L-shaped rods (72).

3. The flameproof motor for underground coal mine according to claim 2, characterized in that: The dual-circulation temperature exchange mechanism (7) further comprises a fixing pile (79) fixedly connected to the top of the ventilation cavity (71); the tops of the two fixing piles (79) are fixedly connected to connecting ropes (78); the ends of the two connecting ropes (78) away from the fixing piles (79) are fixedly connected to clamps (77); a pair of limiting rings (714) are fixedly connected to the top bending part of the L-shaped rod (72); and the bent end of the L-shaped rod (72) is arranged parallel to the third fin (75).

4. The flameproof motor for underground coal mine according to claim 1, characterized in that: The dual-circulation temperature exchange mechanism (7) further comprises a baffle (712) fixedly connected to the edge of the inner wall of the rotating shaft (1); a fan blade (710) is fixedly connected to the edge of the rotating shaft (1); the fan blade (710) is located on a side of the baffle (712) away from the rotor coil (6); a guide plate (713) is rotatably penetrated on a side of the rotating shaft (1) close to the fan blade (710); two sides of the guide plate (713) are respectively fixedly connected to the rotating shaft (1) and the baffle (712); the fan blade (710) penetrates the middle of the guide plate (713); and air flow holes (711) are provided at the four corners of the inner wall of the rotating shaft (1).

5. The flameproof motor for underground coal mine according to claim 1, characterized in that: The explosion-proof mechanism (8) comprises a heat-insulating seat (83) fixedly connected to the top edge of the casing (2); a small dry powder fire extinguishing tank (82) is clamped on the inner wall of the heat-insulating seat (83); a connecting pipe (85) is fixedly connected to the top of the small dry powder fire extinguishing tank (82); a side of the connecting pipe (85) away from the small dry powder fire extinguishing tank (82) is detachably connected to a valve seat (84); the valve seat (84) is fixedly connected to the inner wall of the casing (2); a nozzle (86) is fixedly connected to the bottom of the valve seat (84); a side of the nozzle (86) away from the valve seat (84) penetrates the inner wall of the casing (2); and a side of the nozzle (86) away from the valve seat (84) is arranged toward the middle of the casing (2).

6. The flameproof motor for underground coal mine according to claim 1, characterized in that: The explosion-proof mechanism (8) further comprises a spark detector (87) fixedly connected to the inner wall of the bottom of the junction box (3); an alarm (81) is fixedly connected to the outer wall of the bottom of the junction box (3); and the alarm (81) and the spark detector (87) are electrically connected to each other.

7. The flameproof motor for underground coal mine according to claim 3, characterized in that: The inner diameter of the clamping ring (77) is consistent with the outer diameter of the limiting ring (714).

8. The flameproof motor for underground coal mine according to claim 4, characterized in that: The baffle (712) is arranged in a ring shape and has an inner diameter that is consistent with the outer diameter of the fan blade (710).

Images