Cooling and ventilating device for mining machinery traction system

Abstract

The invention discloses a cooling and ventilating device for a mining machinery traction system, and relates to the technical field of motor cooling and ventilating, the cooling and ventilating device comprises a motor shell, a motor rear cover shell is fixedly mounted on one side of the motor shell, and a hollow rotating shaft is rotatably connected in the motor shell and the motor rear cover shell in a penetrating manner; the rotor is arranged outside the hollow rotating shaft, a protective shell is arranged outside the motor shell and the motor rear cover shell, and a cavity for accommodating the motor shell and the motor rear cover shell is formed in the protective shell; the interior and the exterior of the motor are cooled at the same time, internal cooling can directly cool heating components such as a winding and an iron core in the motor, external cooling can rapidly take away heat of a motor shell and the surrounding environment, the overall heat dissipation efficiency can be remarkably improved through combination of the internal cooling and the external cooling, and the temperature of the motor is more evenly kept within a safety range; the service life of the motor is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of motor cooling ventilation, and particularly to a cooling ventilation device for a mining machinery traction system. Background Technique

[0002] A cooling device for a mining machinery traction system refers to a traction device for mining equipment, mainly including internal combustion engines, motors, or hydraulic systems, etc. Among them, motors occupy a main position in existing mining traction systems. The operation process of a motor is actually a process of mutual conversion between electrical energy and mechanical energy. Inevitably, some losses will also be generated during this process. Most of these losses will be converted into heat, resulting in an increase in the working temperature of the motor windings, iron cores, and other components. To ensure the sustainable operation of the motor, it is necessary to cool and ventilate the motor during its operation to avoid motor overload;

[0003] Cooling ventilation is a cooling method with a simple structure and low cost. The self-ventilation cooling system of existing motors mainly uses a fan installed on the rotating shaft to drive the air flow inside the motor, and then convects with the heat sources inside the motor, thereby absorbing the heat generated during the operation of the motor and cooling and ventilating the motor;

[0004] Existing self-ventilation cooling technologies are divided into two types. One is that cooling air enters the motor from the outside of the motor. After convecting with the high-temperature gas generated by the heat sources inside the motor, the heat generated by the heat sources inside the motor is absorbed and then discharged outside the motor. In the actual use process of the above method, due to the presence of more dust in the environment where mining machinery is located, directly introducing external air as cooling gas into the motor will cause dust to enter the motor and adhere to the surfaces of the electronic components inside the motor, affecting the operation of the motor;

[0005] The other is a fully enclosed circulating ventilation system. In this system, the cooling air is always circulated and used inside the motor. After cooling the motor, the heat is discharged after the cooling air contacts the secondary cooling medium again. In the actual use process of the above method, the cooling of the stator and rotor inside the motor is all through the circulation of cold air inside the device. The cooling air mainly acts on both ends of the stator and rotor, and the passage design for the cooling air to flow through opened at both ends of the motor is generally relatively complex, which easily leads to low heat dissipation efficiency and affects the actual operation of the motor;

[0006] Therefore, we propose a cooling ventilation device for a mining machinery traction system to solve the above problems. Summary of the Invention

[0007] Technical Problems to be Solved

[0008] In view of this, aiming at the deficiencies of the prior art, the present invention provides a cooling and ventilation device for a mining machinery traction system to solve the problems put forward in the above background technology.

[0009] Technical solution

[0010] To achieve the above object, the present invention provides the following technical solution: A cooling and ventilation device for a mining machinery traction system, including a motor housing, a motor rear cover is fixedly installed on one side of the motor housing, a hollow rotating shaft is rotatably connected through the inside of the motor housing and the motor rear cover, a rotor is arranged inside the motor housing, the rotor is arranged outside the hollow rotating shaft, a protective housing is jointly arranged outside the motor housing and the motor rear cover, a cavity for accommodating the motor housing and the motor rear cover is opened inside the protective housing, and an external ventilation component is further included;

[0011] The external ventilation component includes a condensation inlet pipe fixedly connected through one end of the protective housing, a curved gas flow path one is opened inside the protective housing near the condensation inlet pipe, a horizontal gas flow path one is fixedly communicated at the end of the curved gas flow path one away from the condensation inlet pipe, an inclined gas flow path one is fixedly communicated at the end of the horizontal gas flow path one away from the curved gas flow path one, an inclined gas flow path two is fixedly communicated at the end of the inclined gas flow path one away from the horizontal gas flow path one, a horizontal gas flow path two is fixedly communicated at the end of the inclined gas flow path two away from the inclined gas flow path one, a curved gas flow path two is fixedly communicated at the end of the horizontal gas flow path two away from the inclined gas flow path two, a condensation outlet pipe is fixedly communicated at the end of the curved gas flow path two away from the horizontal gas flow path two, and gas gaps are equidistantly and fixedly communicated on the side where the horizontal gas flow path one and the horizontal gas flow path two are close to each other.

[0012] Preferably, the curved gas flow path one, the horizontal gas flow path one, the inclined gas flow path one, the inclined gas flow path two, the horizontal gas flow path two, and the curved gas flow path two are all opened inside the protective housing, the horizontal gas flow path one and the horizontal gas flow path two are communicated with the cavity opened inside the protective housing through the gas gaps, the condensation inlet pipe and the condensation outlet pipe penetrate and extend to the outside of the protective housing, the horizontal gas flow path one and the horizontal gas flow path two are symmetrically arranged with reference to the central axis of the protective housing, the inclined gas flow path one and the inclined gas flow path two are symmetrically arranged with reference to the central axis of the protective housing, and the curved gas flow path one and the curved gas flow path two are symmetrically arranged with reference to the central axis of the protective housing.

[0013] Preferably, an auxiliary component is further included and arranged on the hollow rotating shaft;

[0014] The auxiliary component includes a spiral groove formed on the outer surface of the motor rear cover near one end of the condensation intake pipe. A slider is slidably sleeved on the outer surface of the hollow rotating shaft. Positioning members are symmetrically and fixedly connected to the outer surface of the slider. Gas delivery pipes are provided at one end of each positioning member away from the slider. Pistons are slidably connected inside the gas voids. Bending transfer pipes are fixedly connected to the outer walls of the gas delivery pipes at one end away from the positioning members.

[0015] Preferably, one end of the positioning member away from the slider is slidably connected through the inside of the gas delivery pipe. The piston is fixedly connected to the positioning member. A spring is fixedly connected between one side of the piston away from the positioning member and the inner wall of the gas delivery pipe. The gas delivery pipe is fixedly installed inside the protective housing. The two gas delivery pipes at one end away from the piston are respectively communicated with the first bending gas flow path and the second bending gas flow path. One end of the bending transfer pipe away from the gas delivery pipe is fixedly communicated with the inside of the hollow rotating shaft.

[0016] Preferably, it further includes a cleaning component arranged inside the motor rear cover.

[0017] The cleaning component includes a positioning ring rotatably connected to the outer surface of the hollow rotating shaft. Short connecting rods are rotatably connected to the outer surface of the positioning ring in a circumferential array. Long connecting rods are rotatably connected to one end of each short connecting rod away from the positioning ring. Friction members are rotatably connected to one end of each long connecting rod away from the short connecting rod. Limit members are slidably connected to the outer surfaces of the friction members. The limit members at one end away from the long connecting rods jointly and slidably fit and connect to a limit ring. A filter screen is fixedly connected to one side of the limit ring away from the hollow rotating shaft.

[0018] Preferably, the filter screen is fixedly installed on the inner wall of the motor rear cover. A return spring is fixedly connected between the short connecting rod and the long connecting rod. The outer surface of the friction member is in contact with the outer surface of the filter screen.

[0019] Preferably, it further includes a blowing component arranged on the outer surface of the hollow rotating shaft.

[0020] The blowing component includes a fan chassis fixedly connected to the outer surface of the hollow rotating shaft near one end of the positioning ring. Arc-shaped fan blades are fixedly connected to the outer surface of the fan chassis in a circumferential array around the center point. Partition air channels are formed in the middle parts of the arc-shaped fan blades. Small wings are fixedly connected to one end of each arc-shaped fan blade away from the center point of the fan chassis.

[0021] Preferably, the fan chassis is arranged between the rotor and the positioning ring. Ventilation holes are equidistantly formed in a circumferential array around the center point on the outer surface of the fan chassis.

[0022] Preferably, it further includes a gas flow component arranged inside the hollow rotating shaft.

[0023] The gas flow component includes spoiler vanes fixedly connected to the inner wall of the hollow rotating shaft in a circumferential array. A gas acceleration chamber is formed in the inner groove wall of the hollow rotating shaft. An arc-shaped baffle is fixedly connected to the inner wall of the gas acceleration chamber. The spoiler vanes and the rotor are arranged in the same vertical plane.

[0024] Beneficial effects

[0025] Compared with the prior art, the present invention provides a cooling and ventilation device for a mining machinery traction system, which has the following beneficial effects:

[0026] By setting the side of the spoiler vane away from the inner wall of the hollow rotating shaft as an inclined plane, the inclined plane will change the flow direction of the condensed gas. The gas that originally flowed along the inner wall of the hollow rotating shaft will deflect according to the angle of the inclined plane after encountering the inclined plane of the spoiler vane, thereby changing the overall flow path and making the gas form a more complex flow pattern inside the hollow rotating shaft, increasing the contact area and time between the gas and the surrounding environment;

[0027] During the rotation of the arc-shaped fan blade, the streamlined cross-section enables air to flow more smoothly over the surface of the fan blade, reducing energy loss and resistance caused by friction between the air and the surface of the fan blade. When the fan blade rotates, the air can smoothly transition along the streamlined curved surface, avoiding sudden separation of the air flow and generation of eddy currents, thereby reducing the resistance of the air to the fan blade, improving the rotation efficiency of the fan blade, and enabling the fan to generate a larger air volume with lower energy consumption;

[0028] By dividing the air duct to divide the arc-shaped fan blade into two parts, during the rotation of the arc-shaped fan blade, the divided air duct forms two independent air flow channels for the originally complete fan blade. The air flow in each channel can pass more smoothly. When the arc-shaped fan blade rotates, the air can be more evenly distributed in the two channels, reducing the mutual interference between the air flows, thereby improving the overall ventilation efficiency and increasing the air volume. Due to the independence of the air flow channels, the resistance suffered by the air when passing through the fan blade is more uniform, making the air pressure more stable. The stable air pressure helps to more effectively transport the air to a farther distance, improving the ventilation or heat dissipation effect

[0029] After the condensed gas enters the curved pipe, inside the curved pipe, due to the action of centrifugal force, the condensed gas will generate a secondary flow phenomenon. Secondary flow refers to the additional flow generated in the main flow direction, which will change the velocity distribution and flow direction of the gas. On the inner side of the curved pipe (i.e., the side of the curvature center), the secondary flow will cause the gas to gather towards the center of the pipe; while on the outer side, the secondary flow will cause the gas to approach the pipe wall. Due to the generation of the secondary flow, the heat transfer performance of the condensed gas inside the curved pipe will be enhanced;

[0030] By cooling the inside and outside of the motor simultaneously, the internal cooling can directly cool down the heat-generating components such as the windings and iron cores inside the motor, while the external cooling can quickly remove the heat from the motor housing and the surrounding environment. The combination of the two can significantly improve the overall heat dissipation efficiency, keep the motor temperature more evenly within the safe range, and extend the service life of the motor;

[0031] The surface of the filter screen is wiped by the friction part. Then, while preventing external dust from entering the motor through the filter screen, the filter screen is cleaned to prevent it from being blocked, thus avoiding the blocked filter screen from affecting the cooling ventilation of the motor. Brief Description of the Drawings

[0032] Figure 1 It is a schematic diagram of the overall external structure of the present invention;

[0033] Figure 2 It is a schematic diagram of the internal sectional structure of the overall device of the present invention;

[0034] Figure 3 It is a schematic diagram of the internal sectional structure of the gas transmission pipeline of the present invention;

[0035] Figure 4 It is a schematic diagram of the positional relationship at the piston of the present invention;

[0036] Figure 5 For the present invention Figure 4 The enlarged schematic diagram of the structure at A in

[0037] Figure 6 It is a schematic diagram of the connection relationship at the short connecting rod of the present invention;

[0038] Figure 7 It is a schematic diagram of the connection relationship at the fan chassis of the present invention;

[0039] Figure 8 It is a schematic diagram of the overall structure of the fan chassis of the present invention;

[0040] Figure 9 It is a schematic diagram of the internal sectional structure of the hollow rotating shaft of the present invention.

[0041] In the figure: 11, motor housing; 12, motor rear cover; 13, hollow rotating shaft; 14, rotor; 15, protective housing;

[0042] 21, condensation inlet pipe; 22, first curved gas flow path; 23, first horizontal gas flow path; 24, gas gap; 25, first inclined gas flow path; 26, second inclined gas flow path; 27, second horizontal gas flow path; 28, second curved gas flow path; 29, condensation outlet pipe;

[0043] 31. Spiral groove; 32. Slide block; 33. Positioning part; 34. Gas transmission pipeline; 35. Piston; 36. Bending transmission pipeline;

[0044] 41. Positioning ring; 42. Short connecting rod; 43. Long connecting rod; 44. Friction part; 45. Limiting part; 46. Limiting circular ring; 47. Filter screen;

[0045] 51. Fan chassis; 52. Arc-shaped fan blade; 53. Divided air duct; 54. Small wing;

[0046] 61. Turbulence piece; 62. Gas acceleration chamber; 63. Arc-shaped baffle. Specific implementation manner

[0047] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] Embodiments of the present invention

[0049] Please refer to Figures 1 to 9 , a cooling and ventilation device for a mining machinery traction system, including a motor housing 11, a motor rear cover housing 12 is fixedly installed on one side of the motor housing 11, a hollow rotating shaft 13 is rotatably connected through the interior of the motor housing 11 and the motor rear cover housing 12, a rotor 14 is arranged inside the motor housing 11, the rotor 14 is arranged outside the hollow rotating shaft 13, a protective housing 15 is jointly arranged outside the motor housing 11 and the motor rear cover housing 12, a cavity for accommodating the motor housing 11 and the motor rear cover housing 12 is opened inside the protective housing 15, and an external ventilation component is further included;

[0050] The external ventilation component includes a condensation intake pipe 21 fixedly connected through one end of the protective housing 15. Inside the protective housing 15 near one end of the condensation intake pipe 21, a first curved gas flow path 22 is provided. One end of the first curved gas flow path 22 away from the condensation intake pipe 21 is fixedly connected to a first horizontal gas flow path 23. One end of the first horizontal gas flow path 23 away from the first curved gas flow path 22 is fixedly connected to an inclined gas flow path 25. One end of the inclined gas flow path 25 away from the first horizontal gas flow path 23 is fixedly connected to a second inclined gas flow path 26. One end of the second inclined gas flow path 26 away from the inclined gas flow path 25 is fixedly connected to a second horizontal gas flow path 27. One end of the second horizontal gas flow path 27 away from the second inclined gas flow path 26 is fixedly connected to a second curved gas flow path 28. One end of the second curved gas flow path 28 away from the second horizontal gas flow path 27 is fixedly connected to a condensation outlet pipe 29. Equal-distance fixed connections of gas voids 24 are provided on the side where the first horizontal gas flow path 23 and the second horizontal gas flow path 27 are close to each other.

[0051] Among them, the first curved gas flow path 22, the first horizontal gas flow path 23, the inclined gas flow path 25, the second inclined gas flow path 26, the second horizontal gas flow path 27, and the second curved gas flow path 28 are all provided inside the protective housing 15. The first horizontal gas flow path 23 and the second horizontal gas flow path 27 are communicated with the cavity provided inside the protective housing 15 through the gas voids 24. The condensation intake pipe 21 and the condensation outlet pipe 29 penetrate and extend to the outside of the protective housing 15. The first horizontal gas flow path 23 and the second horizontal gas flow path 27 are symmetrically arranged with reference to the central axis of the protective housing 15. The inclined gas flow path 25 and the second inclined gas flow path 26 are symmetrically arranged with reference to the central axis of the protective housing 15. The first curved gas flow path 22 and the second curved gas flow path 28 are symmetrically arranged with reference to the central axis of the protective housing 15.

[0052] Among them, the condensation intake pipe 21 is connected to the output end of the external cooling gas storage device.

[0053] Further embodiments

[0054] Please refer to Figures 2 to 5 , the cooling and ventilation device for the mining machinery traction system further includes an auxiliary component provided on the hollow rotating shaft 13;

[0055] The auxiliary component includes a spiral groove 31 formed on the outer surface of the motor rear cover 12 near one end of the condensation intake pipe 21. A slider 32 is slidably sleeved on the outer surface of the hollow rotating shaft 13. Symmetrically fixed to the outer surface of the slider 32 are positioning members 33. At one end of each positioning member 33 away from the slider 32, there is a gas delivery pipe 34. Inside the gas gap 24, there is a piston 35 slidably connected. At one end of the outer wall of each gas delivery pipe 34 away from the positioning member 33, there is a bent transfer pipe 36 fixedly connected.

[0056] Among them, at one end of the positioning member 33 away from the slider 32, it penetrates and is slidably connected inside the gas delivery pipe 34. The piston 35 is fixedly connected to the positioning member 33. A spring is fixedly connected between one side of the piston 35 away from the positioning member 33 and the inner wall of the gas delivery pipe 34. The gas delivery pipe 34 is fixedly installed inside the protective housing 15. One end of the two gas delivery pipes 34 away from the piston 35 is respectively communicated with the bent gas flow path one 22 and the bent gas flow path two 28. One end of the bent transfer pipe 36 away from the gas delivery pipe 34 is fixedly communicated with the inside of the hollow rotating shaft 13.

[0057] Among them, the slider 32 slides on the outer surface of the hollow rotating shaft 13 through a spherical connecting member that is slidably connected to the spiral groove 31.

[0058] Further embodiments

[0059] Please refer to Figure 6 and Figure 7 , the cooling and ventilation device for the mining machinery traction system further includes a cleaning component arranged inside the motor rear cover 12;

[0060] The cleaning component includes a positioning ring 41 rotatably connected to the outer surface of the hollow rotating shaft 13. Short connecting rods 42 are rotatably connected to the outer surface of the positioning ring 41 in a circumferential array. At one end of each short connecting rod 42 away from the positioning ring 41, a long connecting rod 43 is rotatably connected. At one end of each long connecting rod 43 away from the short connecting rod 42, a friction member 44 is rotatably connected. The outer surface of each friction member 44 is slidably connected to a limiting member 45. The limiting members 45 are jointly and slidably connected to a limiting ring 46 at one end away from the long connecting rod 43. A filter screen 47 is fixedly connected to one side of the limiting ring 46 away from the hollow rotating shaft 13.

[0061] Among them, the filter screen 47 is fixedly installed on the inner wall of the motor rear cover 12. A return spring is fixedly connected between the short connecting rod 42 and the long connecting rod 43. The outer surface of the friction member 44 is in contact with the outer surface of the filter screen 47.

[0062] Further embodiments

[0063] Please refer to Figure 7 and Figure 8 , the cooling and ventilation device for the mining machinery traction system further includes a blowing component arranged on the outer surface of the hollow rotating shaft 13;

[0064] The blowing component includes a fan chassis 51 fixedly connected to the outer surface of one end of the hollow rotating shaft 13 close to the positioning ring 41. The outer surface of the fan chassis 51 is fixedly connected with arc-shaped fan blades 52 in a circumferential array around the center point. Partition air ducts 53 are opened in the middle parts of the arc-shaped fan blades 52, and small wings 54 are fixedly connected to one ends of the arc-shaped fan blades 52 far from the center point of the fan chassis 51.

[0065] Among them, the fan chassis 51 is arranged between the rotor 14 and the positioning ring 41, and ventilation holes are equidistantly opened in a circumferential array around the center point on the outer surface of the fan chassis 51.

[0066] Further embodiments

[0067] Please refer to Figure 9 , the cooling and ventilation device for the mining machinery traction system further includes a gas flow component arranged inside the hollow rotating shaft 13;

[0068] The gas flow component includes spoiler plates 61 fixedly connected to the inner wall of the hollow rotating shaft 13 in a circumferential array. A gas acceleration chamber 62 is opened on the inner wall of the inner groove of the hollow rotating shaft 13. An arc-shaped baffle 63 is fixedly connected to the inner wall of the gas acceleration chamber 62. The spoiler plates 61 and the rotor 14 are arranged in the same vertical plane.

[0069] The working process and principle of the overall content of the above embodiments are as follows:

[0070] Installation of the device:

[0071] The staff needs to connect the condensation inlet pipe 21 to the output end of the external cooling gas storage device, and then install the cooling and ventilation device for the traction system on the mining machinery equipment, and connect the hollow rotating shaft 13 to the traction device;

[0072] Cooling of the motor:

[0073] When the motor starts, since spiral grooves 31 are opened on the outer surface of the hollow rotating shaft 13, and the slider 32 slides on the outer surface of the hollow rotating shaft 13 through a spherical connector slidingly connected with the spiral grooves 31, when the spiral grooves 31 move with the hollow rotating shaft 13, the slider 32 will reciprocally slide on the outer surface of the hollow rotating shaft 13 through the spherical connector, thereby driving the positioning member 33 rotatably connected to the outer surface of the slider 32 to move together;

[0074] When the positioning member 33 moves, it will drive the piston 35 fixedly connected to it to slide inside the gas delivery pipe 34. When the piston 35 moves, it will stretch the spring arranged between the positioning member 33 and the inner wall of the gas delivery pipe 34, and as the slider 32 reciprocally moves on the outer surface of the hollow rotating shaft 13, the piston 35 will reciprocally slide inside the gas delivery pipe 34 under the action of the stretching or contraction of the positioning member 33 and the spring;

[0075] It should be noted that since one of the gas delivery pipes 34 is interconnected with the condensate inlet pipe 21 through the curved gas flow path one 22, and the other gas delivery pipe 34 is connected to the condensate outlet pipe 29 through the curved gas flow path two 28, when the two pistons 35 reciprocate inside the two gas delivery pipes 34 respectively, the external condensate gas will be transported into the hollow rotating shaft 13 through the upper gas delivery pipe 34 and the curved transmission pipe 36 connected to the gas delivery pipe 34;

[0076] The gas entering the hollow rotating shaft 13 will first pass through the spoiler 61. Since the spoiler 61 is arranged in a circular array around the center of the hollow rotating shaft 13, the condensate gas after passing through the spoiler 61 will accelerate into the hollow rotating shaft 13. And since the side of the spoiler 61 away from the inner wall of the hollow rotating shaft 13 is set as an inclined plane, the setting of the inclined plane will change the flow direction of the condensate gas. The gas originally flowing along the inner wall of the hollow rotating shaft 13 will deflect according to the angle of the inclined plane when it encounters the inclined plane of the spoiler 61, thereby changing the overall flow path and making the gas form a more complex flow pattern inside the hollow rotating shaft 13, increasing the contact area and time between the gas and the surrounding environment;

[0077] The condensate gas after passing through the spoiler 61 will enter the gas acceleration chamber 62 opened inside the hollow rotating shaft 13. And since the cross-section of the gas acceleration chamber 62 is composed of two trapezoids that are axisymmetric in the two horizontal directions, and the short sides are set on the sides where the trapezoids are away from each other, the flow rate of the condensate gas will gradually slow down and disperse inside the gas acceleration chamber 62 after entering the gas acceleration chamber 62. This is because when the condensate gas enters from a pipe with a smaller inner diameter (equivalent to the inner cavity of the hollow rotating shaft 13) into a pipe with a larger inner diameter (equivalent to the gas acceleration chamber 62), due to the increase in the inner diameter of the pipe, according to the law of conservation of mass and the continuity equation, the volume flow rate of the gas passing through any cross-section of the pipe per unit time is equal. After the inner diameter of the pipe increases, the cross-sectional area increases, and in the case of constant volume flow rate, the gas flow rate must decrease to satisfy the continuity equation;

[0078] Subsequently, the condensate gas inside the gas acceleration chamber 62 will be further accelerated by the arc baffle 63 and then enter the other half of the gas acceleration chamber 62 divided by the arc baffle 63, and then flow out of the hollow rotating shaft 13 through the other end of the hollow rotating shaft 13 after being accelerated again;

[0079] In the above process, since the gas acceleration chamber 62 and the rotor 14 are both in the same vertical plane, the diffusion and accelerated flow of the condensate gas inside the gas acceleration chamber 62 and the hollow rotating shaft 13 will further drive the heat loss, thereby further accelerating the heat generated when the motor works as a starting element of the traction system;

[0080] Moreover, since the gas transmission pipeline 34, the piston 35, and the curved transmission pipeline 36 are all symmetrically arranged, the reciprocating movements of the upper and lower pistons 35 will synchronously transport the condensed gas into the hollow rotating shaft 13 through the curved transmission pipeline 36 to further cool the motor during operation;

[0081] The hollow rotating shaft 13 starts to rotate under the action of the rotor 14 and the overall external power supply of the motor. At this time, the fan chassis 51 fixedly connected to the outer surface of the hollow rotating shaft 13 will rotate accordingly. The arc-shaped fan blades 52 fixedly connected around the center point on the outer surface of the fan chassis 51 disturb the air flow. Since one side of the arc-shaped fan blade 52 is set as a streamlined cross-section, and a split air duct 53 is provided at the middle position of each arc-shaped fan blade 52, and small wings 54 are fixedly connected to the arc-shaped fan blades 52, the arc-shaped fan blades 52 rotate to disturb the air flow inside the motor, thereby further cooling the inside of the motor;

[0082] During the rotation of the arc-shaped fan blade 52, the streamlined cross-section enables air to flow more smoothly over the surface of the fan blade, reducing the energy loss and resistance generated by the friction between the air and the surface of the fan blade. When the fan blade rotates, the air can smoothly transition along the streamlined curved surface, avoiding the sudden separation of the air flow and the generation of eddy currents, thereby reducing the resistance of the air to the fan blade, improving the rotation efficiency of the fan blade, and enabling the fan to generate a larger air volume with lower energy consumption;

[0083] In addition, since the split air duct 53 divides the arc-shaped fan blade 52 into two parts, during the rotation of the arc-shaped fan blade 52, the split air duct 53 forms two independent air flow channels for the originally complete fan blade. The air flow in each channel can pass more smoothly. When the arc-shaped fan blade 52 rotates, the air can be more evenly distributed in the two channels, reducing the mutual interference between the air flows, thereby improving the overall ventilation efficiency and increasing the air volume. Due to the independence of the air flow channels, the resistance received by the air when passing through the fan blade is more uniform, making the air pressure more stable. The stable air pressure helps to more effectively transport the air to a farther distance, improving the ventilation or heat dissipation effect;

[0084] Moreover, during the rotation of the arc-shaped fan blade 52, the small wings 54 provided on the arc-shaped fan blade 52 will rotate accordingly. The presence of the small wings 54 can guide the air flow, making the air flow more orderly along a specific direction. When the arc-shaped fan blade 52 rotates, the small wings 54 can more smoothly introduce the surrounding air into the working area of the fan blade, reducing the disorder and generation of eddy currents of the air flow, thereby improving the ventilation or heat dissipation efficiency.

[0085] Overall cooling of the outside of the motor:

[0086] During the operation of the motor, the condensed gas enters through the condensed gas inlet pipe 21, then enters the horizontal gas flow path 23 through the curved gas flow path 22, and then enters the inclined gas flow path 25. After that, it passes through the inclined gas flow path 26 and the horizontal gas flow path 27, and then enters the curved gas flow path 28, and finally flows out from the condensed gas outlet pipe 29, completing the cycle of the condensed gas, thereby dissipating heat from the outside of the motor;

[0087] In the above process, due to the settings of the curved gas flow path 22 and the curved gas flow path 28, after the condensed gas enters the inside of the curved pipe, inside the curved pipe, due to the action of centrifugal force, a secondary flow phenomenon will occur to the condensed gas. Secondary flow refers to the additional flow generated in the main flow direction, which will change the gas velocity distribution and flow direction. On the inner side of the curved pipe (i.e., the side of the center of curvature), the secondary flow will cause the gas to gather towards the center of the pipe; while on the outer side, the secondary flow will cause the gas to approach the pipe wall. Due to the generation of the secondary flow, the heat transfer performance of the condensed gas inside the curved pipe will be enhanced;

[0088] Subsequently, when the gas circulates through the horizontal gas flow path 23 and the horizontal gas flow path 27, a part of the condensed gas will enter the inside of the protective housing 15 through the gas void 24 connected on the horizontal gas flow path 23 and the horizontal gas flow path 27, and contact the motor housing 11 and the motor rear cover housing 12 to cool the whole motor from the outside of the motor;

[0089] By cooling the inside and outside of the motor simultaneously, the internal cooling can directly cool the heating components such as the windings and iron cores inside the motor, while the external cooling can quickly take away the heat of the motor housing 11 and the surrounding environment. The combination of the two can significantly improve the overall heat dissipation efficiency, keep the motor temperature more evenly within the safe range, and extend the service life of the motor.

[0090] Dust prevention inside the motor:

[0091] As the hollow rotating shaft 13 rotates, the positioning ring 41 fixedly connected to the surface of the hollow rotating shaft 13 will rotate accordingly. At this time, the short connecting rod 42 rotatably connected to the outer surface of the positioning ring 41 will move accordingly, and then drive the long connecting rod 43 rotatably connected to the short connecting rod 42 to rotate. In the above process, since a spring is fixedly connected between the long connecting rod 43 and the short connecting rod 42, the long connecting rod 43 and the short connecting rod 42 will be affected by centrifugal force during rotation. The long connecting rod 43 will move towards the end away from the hollow rotating shaft 13 and stretch the spring arranged between the long connecting rod 43 and the short connecting rod 42;

[0092] At this time, the movement of the long connecting rod 43 will drive the friction member 44 rotatably connected to its surface to move vertically inside the limiting member 45. While the hollow rotating shaft 13 drives the long connecting rod 43 to rotate through the positioning ring 41, the long connecting rod 43 will drive the limiting ring to slide on the surface of the limiting circular ring 46, so as to wipe the surface of the filter screen 47 through the friction member 44. Furthermore, while preventing external dust from entering the motor through the filter screen 47, the filter screen 47 is cleaned to prevent the filter screen 47 from being blocked, thereby avoiding the blocked filter screen 47 from affecting the cooling and ventilation of the motor.

[0093] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the presence of additional identical elements in the process, method, article or device including the said element.

[0094] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cooling and ventilation device for a traction system of mining machinery, comprising a motor housing (11), a motor rear cover (12) is fixedly installed on one side of the motor housing (11), a hollow rotating shaft (13) is rotatably connected through the inside of the motor housing (11) and the motor rear cover (12), a rotor (14) is arranged inside the motor housing (11), the rotor (14) is arranged outside the hollow rotating shaft (13), a protective housing (15) is jointly arranged outside the motor housing (11) and the motor rear cover (12), a cavity for accommodating the motor housing (11) and the motor rear cover (12) is formed inside the protective housing (15), and it is characterized in that: It also includes an external ventilation component; The external ventilation component includes a condensation inlet pipe (21) fixedly connected through one end of the protective housing (15). Inside the protective housing (15) near one end of the condensation inlet pipe (21), a first curved gas flow path (22) is provided. One end of the first curved gas flow path (22) away from the condensation inlet pipe (21) is fixedly communicated with a first horizontal gas flow path (23). One end of the first horizontal gas flow path (23) away from the first curved gas flow path (22) is fixedly communicated with a first inclined gas flow path (25). One end of the first inclined gas flow path (25) away from the first horizontal gas flow path (23) is fixedly communicated with a second inclined gas flow path (26). One end of the second inclined gas flow path (26) away from the first inclined gas flow path (25) is fixedly communicated with a second horizontal gas flow path (27). One end of the second horizontal gas flow path (27) away from the second inclined gas flow path (26) is fixedly communicated with a second curved gas flow path (28). One end of the second curved gas flow path (28) away from the second horizontal gas flow path (27) is fixedly communicated with a condensation outlet pipe (29). On one side where the first horizontal gas flow path (23) and the second horizontal gas flow path (27) are close to each other, gas voids (24) are fixedly communicated at equal intervals.

2. The cooling and ventilation device for a mine machinery traction system according to claim 1, characterized in that: The first curved gas flow path (22), the first horizontal gas flow path (23), the first inclined gas flow path (25), the second inclined gas flow path (26), the second horizontal gas flow path (27), and the second curved gas flow path (28) are all provided inside the protective housing (15). The first horizontal gas flow path (23) and the second horizontal gas flow path (27) are communicated with the cavity provided inside the protective housing (15) through the gas voids (24). The condensation inlet pipe (21) and the condensation outlet pipe (29) penetrate and extend to the outside of the protective housing (15). The first horizontal gas flow path (23) and the second horizontal gas flow path (27) are symmetrically arranged with reference to the central axis of the protective housing (15). The first inclined gas flow path (25) and the second inclined gas flow path (26) are symmetrically arranged with reference to the central axis of the protective housing (15). The first curved gas flow path (22) and the second curved gas flow path (28) are symmetrically arranged with reference to the central axis of the protective housing (15).

3. A cooling and ventilation device for a mine machinery traction system according to claim 1, characterized in that: It also includes an auxiliary component provided on the hollow rotating shaft (13); The auxiliary component includes a spiral groove (31) provided on the outer surface of the motor rear cover (12) near one end of the condensation inlet pipe (21). A slider (32) is slidably sleeved on the outer surface of the hollow rotating shaft (13). Positioning members (33) are symmetrically and fixedly connected to the outer surface of the slider (32). Gas delivery pipes (34) are provided at one end of the positioning members (33) away from the slider (32). Pistons (35) are slidably connected inside the gas voids (24). Curved transmission pipes (36) are fixedly communicated with the outer walls of one end of the gas delivery pipes (34) away from the positioning members (33).

4. A cooling and ventilation device for a mine machinery traction system according to claim 3, characterized in that: One end of the positioning member (33) away from the slider (32) penetrates and is slidably connected to the inside of the gas delivery pipe (34). The piston (35) is fixedly connected to the positioning member (33). A spring is fixedly connected between the side of the piston (35) away from the positioning member (33) and the inner wall of the gas delivery pipe (34). The gas delivery pipe (34) is fixedly installed inside the protective housing (15). One ends of the two gas delivery pipes (34) away from the piston (35) are respectively communicated with the curved gas flow path one (22) and the curved gas flow path two (28). One end of the curved transmission pipe (36) away from the gas delivery pipe (34) is fixedly communicated with the inside of the hollow rotating shaft (13).

5. A cooling and ventilation device for a mining machinery traction system according to claim 1, characterized in that: It further includes a cleaning component arranged inside the motor rear cover (12); The cleaning component includes a positioning ring (41) rotatably connected to the outer surface of the hollow rotating shaft (13). Short connecting rods (42) are rotatably connected to the outer surface of the positioning ring (41) in a circumferential array. One ends of the short connecting rods (42) away from the positioning ring (41) are all rotatably connected to long connecting rods (43). One ends of the long connecting rods (43) away from the short connecting rods (42) are all rotatably connected to friction members (44). Limiting members (45) are slidably connected to the outer surfaces of the friction members (44). One ends of the limiting members (45) away from the long connecting rods (43) jointly and slidably fit and connect to a limiting ring (46). A filter screen (47) is fixedly connected to one side of the limiting ring (46) away from the hollow rotating shaft (13).

6. The cooling and ventilation device for a mine machinery traction system according to claim 5, wherein: The filter screen (47) is fixedly installed on the inner wall of the motor rear cover (12). A return spring is fixedly connected between the short connecting rod (42) and the long connecting rod (43). The outer surface of the friction member (44) is in contact with the outer surface of the filter screen (47).

7. The cooling and ventilation device for a mining machinery traction system according to claim 5, characterized in that: It further includes a blowing component arranged on the outer surface of the hollow rotating shaft (13); The blowing component includes a fan chassis (51) fixedly connected to the outer surface of one end of the hollow rotating shaft (13) close to the positioning ring (41). Arc-shaped fan blades (52) are fixedly connected to the outer surface of the fan chassis (51) in a circumferential array around the center point. Split air channels (53) are opened in the middle parts of the arc-shaped fan blades (52). Small wings (54) are fixedly connected to one ends of the arc-shaped fan blades (52) away from the center point of the fan chassis (51).

8. The cooling and ventilation device for a mine machinery traction system according to claim 7, characterized in that: The fan chassis (51) is arranged between the rotor (14) and the positioning ring (41). Ventilation holes are equidistantly opened in a circumferential array around the center point on the outer surface of the fan chassis (51).

9. A cooling and ventilation device for a mine machinery traction system according to claim 1, characterized in that: It further includes a gas flow component arranged inside the hollow rotating shaft (13); The gas flow component includes spoiler vanes (61) fixedly connected to the inner wall of the hollow rotating shaft (13) in a circumferential array. A gas acceleration cavity (62) is opened on the inner wall of the inner groove of the hollow rotating shaft (13). An arc-shaped baffle (63) is fixedly connected to the inner wall of the gas acceleration cavity (62). The spoiler vanes (61) and the rotor (14) are arranged in the same vertical plane.

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