Mining flame-proof motor and mining ventilation equipment

Abstract

The invention provides a mining explosion-proof type motor and mining ventilation equipment, the mining explosion-proof type motor comprises a motor main body, the motor main body comprises a base, a first end cover, a second end cover, a stator structure and a rotor structure, the first end cover and the second end cover are correspondingly installed at the two ends of the base respectively along the axial direction of the motor main body, and the stator structure and the rotor structure are arranged on the motor main body. The stator structure and the rotor structure are installed in a main cavity defined by the machine base, the first end cover and the second end cover. The junction box and the motor main body are arranged at an interval along a preset direction; and the connecting part is of a cylindrical structure, one end of the connecting part is in sealed connection with the motor main body, and the other end of the connecting part is in sealed connection with the junction box. According to the mining explosion-proof motor, the technical problem of insufficient safety of the mining explosion-proof motor in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the field of motor design, and in particular to a flameproof motor for mining and mining ventilation equipment. Background Art

[0002] Mining motors are devices used in mines to achieve power output. Due to the special use environment, in order to ensure the safety of the use process, the explosion-proof requirements of mining motors are usually high. Although the mining explosion-proof motors in the relevant technology are designed specifically for the explosion-proof requirements, their wiring positions are still in the explosion-proof weak area, making it difficult to ensure the safety of mining explosion-proof motors in actual use.

[0003] It can be seen that there is a technical problem in the related technology that the safety of explosion-proof motors for mining is insufficient, and no effective solution has been proposed yet for this technical problem. Summary of the invention

[0004] The main purpose of the present invention is to provide a flameproof motor for mining and a ventilation device for mining, so as to solve the technical problem of insufficient safety of flameproof motor for mining in the related art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided a mining flameproof electric motor, comprising: a motor body, the motor body comprising a base, a first end cover, a second end cover, a stator structure and a rotor structure, along the axial direction of the motor body, the first end cover and the second end cover are respectively and correspondingly installed at the two ends of the base, and the stator structure and the rotor structure are installed in a main chamber surrounded by the base, the first end cover and the second end cover; a junction box, along a preset direction, the junction box and the motor body are spaced apart; a connecting part, the connecting part is a cylindrical structure, one end of the connecting part is sealed and connected to the motor body, and the other end of the connecting part is sealed and connected to the junction box.

[0006] Further, along the preset direction, the length of the connecting portion ranges from 1.5 m to 2.5 m.

[0007] Furthermore, the stator structure includes a stator core and a stator winding wound thereon, and the stator winding is a three-phase distributed winding; the rotor structure includes a rotating shaft, a rotor core and a permanent magnet, the rotating shaft passes through the rotor core, and the permanent magnet is embedded and installed in the rotor core.

[0008] Furthermore, the explosion-proof motor for mining includes: a first bearing device, which is installed on the first end cover and cooperates with the shaft extension end of the rotating shaft; a second bearing device, which is installed on the second end cover and cooperates with the non-shaft extension end of the rotating shaft; wherein the first bearing device includes an angular contact bearing and a first column bearing, and the second bearing device includes a second column bearing.

[0009] Furthermore, the base includes a first end plate and a second end plate, and along the axial direction of the mining flameproof motor, the first end plate and the second end plate are respectively and correspondingly arranged at the two ends of the base main structure; the mining flameproof motor also includes: a plurality of heat dissipation pipes, and the heat dissipation pipes are all penetrated through the first end plate and the second end plate; a first cooling fan, the first cooling fan is arranged in the main chamber, and along the axial direction of the mining flameproof motor, the first cooling fan is located on the side of the first cooling fan and the rotor core; a wind shield, and the wind shield is arranged on the side of the first cooling fan close to the stator structure.

[0010] Furthermore, the mining flameproof motor also includes a plurality of support ribs, each of which is extended along the axial direction of the mining flameproof motor, and each of which is connected to the base, the first end plate and the second end plate. The plurality of support ribs are arranged at intervals along the circumference of the mining flameproof motor, and the heat dissipation pipe is arranged between two adjacent support ribs.

[0011] Furthermore, the explosion-proof motor for mining also includes a second cooling fan located outside the main chamber, and the second cooling fan is connected to the rotating shaft.

[0012] Furthermore, a plurality of groups of ventilation holes are provided on the rotor core, and the plurality of groups of ventilation holes are arranged in sequence and at intervals along the circumferential direction of the mining flameproof motor. Each group of ventilation holes includes a plurality of ventilation holes arranged in sequence and at intervals along the axial direction of the mining flameproof motor. For any ventilation hole, it is extended radially along the mining flameproof motor.

[0013] Furthermore, the stator core includes a plurality of stator slots, which are arranged in sequence along the circumference of the stator core, and an open slot is provided at the inner wall of the slot opening of the stator slot; for any stator slot, the angle θ between the inner slot surface of the open slot and the extension direction of the stator slot is °, and the inner slot surface of the open slot is the surface of the open slot close to the bottom of the stator slot.

[0014] According to another aspect of the present invention, a mining ventilation device is provided, which includes a main ventilation duct, an impeller and a motor. The motor is the above-mentioned mining flameproof motor. The impeller is installed on the rotor shaft of the mining flameproof motor. The motor body of the mining flameproof motor is arranged in the main ventilation duct. The junction box of the mining flameproof motor is located outside the main ventilation duct. The connecting part of the mining flameproof motor is arranged through the main ventilation duct.

[0015] The flameproof motor for mining of the embodiment of the present invention comprises: a motor body, the motor body comprises a base, a first end cover, a second end cover, a stator structure and a rotor structure, along the axial direction of the motor body, the first end cover and the second end cover are respectively installed at the two ends of the base, and the stator structure and the rotor structure are installed in the main chamber surrounded by the base, the first end cover and the second end cover; a junction box, along the preset direction, the junction box and the motor body are arranged at intervals; a connecting part, the connecting part is a cylindrical structure, one end of the connecting part is sealed and connected to the motor body, and the other end of the connecting part is sealed and connected to the junction box. The flameproof motor for mining with this structural design is designed with a connecting part, through which the motor body and the junction box are sealed and connected, when the flameproof motor for mining is used in flammable and explosive occasions, the junction box can be led out to a safer place for wiring through the connecting part, which can avoid exposing the junction box to flammable and explosive environments, effectively improving the safety of the use of the flameproof motor for mining, and solving the technical problem of insufficient safety of the flameproof motor for mining in the related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 It is a structural schematic diagram of an embodiment of a flameproof motor for mining of the present invention;

[0018] Figure 2 It is a partial cross-sectional structural schematic diagram of an embodiment of a flameproof motor for mining use of the present invention;

[0019] Figure 3 It is a structural schematic diagram of a base of an embodiment of a flameproof motor for mining use of the present invention;

[0020] Figure 4 for Figure 3 The schematic diagram of the cross-sectional structure along the BB line;

[0021] Figure 5 It is a structural schematic diagram of a stator core of an embodiment of a flameproof motor for mining use of the present invention;

[0022] Figure 6 for Figure 5 A partial enlarged schematic diagram of the middle A area;

[0023] Figure 7 A schematic diagram of a rotor structure of an embodiment of a flameproof motor for mining use according to the present invention;

[0024] Figure 8 It is a schematic structural diagram of a rotor core and a permanent magnet of an embodiment of a flameproof motor for mining use of the present invention;

[0025] Fig. 9 The figure is a schematic diagram of the installation of the balancing block of the embodiment of the flameproof motor for mining of the present invention.

[0026] The above drawings include the following reference numerals:

[0027] 1. Motor body; 11. Machine base; 12. First end cover; 13. Second end cover; 14. Stator structure; 141. Stator core; 142. Stator winding; 143. Stator slot; 144. Open slot; 15. Rotor structure; 150. Rotating shaft; 151. Rotor core; 152. Permanent magnet; 153. Ventilation hole; 154. Balance block; 155. Bolt; 156. Starting slot; 161. First bearing device; 162. Second bearing device; 171. First end plate; 172. Second end plate; 173. Heat pipe; 174. First cooling fan; 175. Wind shield; 176. Support rib; 177. Second cooling fan; 2. Junction box; 21. Main junction box; 22. Heater junction box; 23. Temperature measurement junction box; 3. Connecting part. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] Please refer to Figures 1 to 9 In order to achieve the above-mentioned purpose, an embodiment of the present invention provides a flameproof motor for mining, which comprises: a motor body 1, the motor body comprises a base 11, a first end cover 12, a second end cover 13, a stator structure 14 and a rotor structure 15, along the axial direction of the motor body 1, the first end cover 12 and the second end cover 13 are respectively installed at the two ends of the base 11, and the stator structure 14 and the rotor structure 15 are installed in a main chamber surrounded by the base 11, the first end cover 12 and the second end cover 13; a junction box 2, along a preset direction, the junction box 2 is spaced apart from the motor body 1; a connecting part 3, the connecting part 3 is a cylindrical structure, one end of the connecting part 3 is sealed and connected to the motor body 1, and the other end of the connecting part 3 is sealed and connected to the junction box 2.

[0030] The mining flameproof motor adopting this structural design is designed with a connecting part 3, through which the motor body 1 and the terminal box 2 are sealed and connected. When the mining flameproof motor is used in flammable and explosive occasions, the terminal box 2 can be led out to a safer place for wiring through the connecting part 3, which can avoid exposing the terminal box 2 to the flammable and explosive environment, effectively improving the safety of the use of the mining flameproof motor and solving the technical problem of insufficient safety of the mining flameproof motor in the related technology.

[0031] Specifically, along the preset direction, the length of the connection portion 3 ranges from 1.5m to 2.5m. The specific length of the connection portion 3 can be flexibly selected according to actual conditions to ensure that the junction box 2 is led out of the inflammable and explosive environment for wiring.

[0032] In a specific embodiment, the stator structure 14 includes a stator core 141 and a stator winding 142 wound thereon, and the stator winding 142 is a three-phase distributed winding; the rotor structure 15 includes a rotating shaft 150, a rotor core 151 and a permanent magnet 152, the rotating shaft 150 is passed through the rotor core 151, and the permanent magnet 152 is embedded and installed in the rotor core 151.

[0033] In this embodiment, the flameproof high-voltage permanent magnet synchronous motor for mining adopts three-phase power supply, which integrates the advantages of flameproof asynchronous motor and permanent magnet synchronous motor. The stator structure 14 adopts the three-phase AC motor stator structure of the high-voltage asynchronous flameproof motor, and the rotor structure 15 adopts the embedded magnetic steel plus copper bar structure. The motor runs smoothly, has small vibration and low noise, thereby retaining the advantages of flameproof asynchronous motor structure reliability and the advantages of permanent magnet motor built-in rotor structure simplicity and high efficiency. The flameproof high-voltage permanent magnet synchronous motor has high power density, safety and reliability, cost-effectiveness, obvious energy-saving effect, smaller size and higher efficiency, and has a good practical application prospect.

[0034] Practice has proved that the flameproof motor for mining of the embodiment of the present invention has the following significant advantages after adopting the above structural design:

[0035] The mine flameproof motor with the above structural design has high efficiency and power factor, and the efficiency can reach the Class 1 energy efficiency standard, thanks to the extremely wide range of the high efficiency section of the efficiency curve of the permanent magnet synchronous motor, especially the permanent magnet synchronous motor is particularly outstanding when running under light load. Since the rotor structure 15 is made of permanent magnets 152, the magnetic flux density is high, no excitation (conductor bar) current is required, and the excitation loss is eliminated. Compared with the asynchronous motor, the excitation current of the stator side winding and the copper loss and iron loss of the rotor side are reduced, and the reactive current is greatly reduced. Since the stator and rotor magnetic potentials are synchronized, the rotor iron core has no fundamental wave iron loss, so the efficiency and power factor are much higher than those of the asynchronous motor, especially when running under light load, the efficiency and power factor are also high; the permanent magnet synchronous motor can maintain a high power factor and high efficiency within the load range of 25%-120%, while the general three-phase synchronous motor can only maintain it within the load range of 70-100%.

[0036] The explosion-proof motor for mining with the above structural design has a wider speed regulation range, stronger overload capacity and short starting time. Specifically, the speed regulation range of the permanent magnet synchronous motor can be used for continuous operation between 0-120% of the rated speed, meeting the requirements of wide range speed regulation; the permanent magnet synchronous motor has a strong overload capacity and can reach 3 times the overload capacity in a short time. It has a high tolerance for motor torque disturbances caused by load changes, fast response and fast operation. Compared with the asynchronous variable frequency motor, the main magnetic field of the permanent magnet variable frequency motor is weak and the power factor is low when the starting current is 1.5 to 2 times the rated current. The rated torque can only be achieved. The main magnetic field of the permanent magnet variable frequency motor is constant, and the stator current is almost entirely active current. The rated torque can be achieved when the starting current is 1 times the rated current. A smaller starting current can obtain a larger starting torque, and the system speed increases quickly, which well guarantees the stable and reliable operation of the system.

[0037] The mining flameproof motor adopting the above structural design has a small rated current, lower temperature rise and long life: due to its higher efficiency and power factor, the rated current of the permanent magnet motor can be reduced by more than 10% compared with the three-phase asynchronous motor; the power density of the permanent magnet synchronous motor is more than twice that of the general asynchronous motor. Under the same heat dissipation conditions and insulation material conditions, the temperature rise can be reduced by more than 15K and the life is long.

[0038] The mining flameproof motor adopting the above-mentioned structural design has lower noise, improves the working environment and is more environmentally friendly: the permanent magnet synchronous motor has low harmonic content, which can greatly reduce electromagnetic vibration and electromagnetic noise. The overall noise of the motor can be reduced by about 3 decibels, improving the working environment.

[0039] The rotor structure of the explosion-proof motor for mining with the above-mentioned structural design is more reliable: drawing on our company's experience in fixing the magnetic poles and rotor bars of TAW series and QFW series brushless synchronous motors and generators, the permanent magnets of the built-in permanent magnet synchronous motor are embedded in the rotor core, and are reliably fixed in the axial and radial directions. Under the action of centrifugal force, the permanent magnets are stably installed and not easy to fall off; the overall temperature rise is low and it is not easy to demagnetize; compared with asynchronous motors, permanent magnet synchronous motors have a larger air gap, and the requirements for the form and position tolerances and assembly concentricity of components are reduced, which effectively reduces the occurrence of shaft seizure, sweeping and other faults when the rotor is running at high speed; for example, the air gap of the 18P asynchronous motor is 1.1mm, and that of the permanent magnet motor is more than 2mm.

[0040] The mining flameproof motor adopting the above structural design does not require reactive power compensation, has strong replaceability and low investment: the permanent magnet motor has a higher power factor and does not need to absorb a large amount of reactive current from the power grid, which reduces the load on the power grid and power generation and transmission equipment, and does not need to install reactive power compensators, reducing investment; the installation and external dimensions of the flameproof series permanent magnet synchronous motors and conventional flameproof series asynchronous motors are completely consistent, and they can be directly replaced, which comprehensively improves the asynchronous motors and achieves seamless connection.

[0041] like Figure 2 As shown, the flameproof motor for mining includes: a first bearing device 161, which is installed on the first end cover 12, and the first bearing device 161 cooperates with the shaft extension end of the rotating shaft 150; a second bearing device 162, which is installed on the second end cover 13, and the second bearing device 162 cooperates with the non-shaft extension end of the rotating shaft 150; wherein the first bearing device 161 includes an angular contact bearing and a first column bearing, and the second bearing device 162 includes a second column bearing. By designing an angular contact bearing and a first column bearing for the first bearing device 161, and designing the second bearing device 162 and the second column bearing, the ability of the flameproof motor for mining to bear axial load is effectively improved, thereby improving its running stability.

[0042] like Figure 2 As shown, the base 11 includes a first end plate 171 and a second end plate 172. Along the axial direction of the mining flameproof motor, the first end plate 171 and the second end plate 172 are respectively and correspondingly arranged at the two ends of the main structure of the base 11; the mining flameproof motor also includes: a plurality of heat dissipation pipes 173, and the heat dissipation pipes 173 are all penetrated through the first end plate 171 and the second end plate 172; a first cooling fan 174, the first cooling fan 174 is arranged in the main chamber, along the axial direction of the mining flameproof motor, the first cooling fan 174 is located on the side of the first cooling fan 174 and the rotor core 151; a wind shield 175, the wind shield 175 is arranged on the side of the first cooling fan 174 close to the stator structure 14. When the rotor structure 15 rotates, the shaft 150 drives the first cooling fan 174 to rotate. Under the guidance of the wind shield 175, the first cooling fan 174 drives the air in the main chamber to flow better along the planned path, thereby transferring the heat on the stator structure 14 and the rotor structure 15 to the heat pipe 173, and dissipating the heat to the outside of the motor through the heat pipe 173.

[0043] like Figure 3 and Figure 4 As shown, the flameproof motor for mining further includes a plurality of support ribs 176, each of which is arranged along the axial extension of the flameproof motor for mining, and each of which is connected to the base 11, the first end plate 171, and the second end plate 172. The plurality of support ribs 176 are arranged at intervals along the circumference of the flameproof motor for mining, and the heat dissipation pipe 173 is arranged between two adjacent support ribs 176. By designing a plurality of support ribs 176, the structural strength of the base 11 can be effectively increased, and the rationality of the spatial arrangement of the heat dissipation pipe 173 can be ensured.

[0044] like Figure 2As shown, the flameproof motor for mining further includes a second cooling fan 177 located outside the main chamber, and the second cooling fan 177 is connected to the rotating shaft 150. When the rotor structure 15 rotates, the rotating shaft 150 drives the second cooling fan 177 to rotate, and the second cooling fan 177 drives the air flow outside the main chamber when rotating, so that the air flows through the cooling pipe 173 more fully, thereby improving the heat dissipation effect of the motor.

[0045] like Figure 7 As shown, a plurality of groups of ventilation holes 153 are provided on the rotor core 151, and the plurality of groups of ventilation holes 153 are sequentially spaced along the circumferential direction of the flameproof motor for mining, and each group of ventilation holes 153 includes a plurality of ventilation holes 153 sequentially spaced along the axial direction of the flameproof motor for mining, and any ventilation hole 153 is extended along the radial direction of the flameproof motor for mining, and the ventilation hole 153 extends to the outer peripheral surface of the rotor core 151. By designing the ventilation holes 153, the air flow at the rotor core 151 can be strengthened, thereby improving the heat dissipation effect of the rotor core, and avoiding the situation that the permanent magnet 152 is demagnetized prematurely due to excessive temperature caused by poor rotor heat dissipation.

[0046] like Figure 5 and Figure 6 As shown, the stator core 141 includes a plurality of stator slots 143, which are arranged in sequence along the circumference of the stator core 141 at intervals, and an open slot 144 is provided at the inner wall of the slot opening of the stator slot 143; for any stator slot 143, the angle θ between the inner slot surface of the open slot 144 and the extension direction of the stator slot 143 is 60°, and the inner slot surface of the open slot 144 is the surface of the open slot 144 close to the slot bottom of the stator slot 143. In this embodiment, the slot opening of the stator slot 143 is provided with an open slot 144 for installing a slot wedge, which is different from the method of using a 45° slot wedge in the related art. In this embodiment, the angle θ between the inner slot surface of the open slot 144 and the extension direction of the stator slot 143 is 60°, and the slot wedge is less likely to loosen after installation.

[0047] like Figure 7 and Fig. 9 As shown, in order to dynamically balance the rotor, a balancing block 154 is provided on the rotating shaft 150 of the rotor structure 15. In order to ensure that the balancing block is reliably fixed, in this embodiment, the balancing block 154 is connected to the rotating shaft 150 by bolts 155, and the bolts 155 are fixed by welding (for example, the bolts 155 are welded to the nuts, and the bolts 155 are welded to the rotating shaft 150).

[0048] According to another aspect of the present invention, a mining ventilation device is provided, which includes a main ventilation duct, an impeller and a motor. The motor is the above-mentioned mining flameproof motor. The impeller is installed on the rotor shaft of the mining flameproof motor. The motor body 1 of the mining flameproof motor is arranged in the main ventilation duct, the junction box 2 of the mining flameproof motor is located outside the main ventilation duct, and the connecting part 3 of the mining flameproof motor is arranged through the main ventilation duct.

[0049] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0050] The mining flameproof motor of the embodiment of the present invention comprises: a motor body 1, the motor body comprises a base 11, a first end cover 12, a second end cover 13, a stator structure 14 and a rotor structure 15, along the axial direction of the motor body 1, the first end cover 12 and the second end cover 13 are respectively and correspondingly installed at the two ends of the base 11, and the stator structure 14 and the rotor structure 15 are installed in a main chamber surrounded by the base 11, the first end cover 12 and the second end cover 13; a junction box 2, along a preset direction, the junction box 2 and the motor body 1 are spaced apart; a connecting part 3, the connecting part 3 is a cylindrical structure, one end of the connecting part 3 is sealed and connected to the motor body 1, and the other end of the connecting part 3 is sealed and connected to the junction box 2. The mining flameproof motor adopting this structural design is designed with a connecting part 3, through which the motor body 1 and the terminal box 2 are sealed and connected. When the mining flameproof motor is used in flammable and explosive occasions, the terminal box 2 can be led out to a safer place for wiring through the connecting part 3, which can avoid exposing the terminal box 2 to the flammable and explosive environment, effectively improving the safety of the use of the mining flameproof motor and solving the technical problem of insufficient safety of the mining flameproof motor in the related technology.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0052] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0053] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flameproof motor for mining, characterized in that: include: A motor body (1), the motor body comprising a base (11), a first end cover (12), a second end cover (13), a stator structure (14) and a rotor structure (15); along the axial direction of the motor body (1), the first end cover (12) and the second end cover (13) are respectively and correspondingly mounted on two ends of the base (11); the stator structure (14) and the rotor structure (15) are mounted in a main chamber surrounded by the base (11), the first end cover (12) and the second end cover (13); A junction box (2), wherein the junction box (2) and the motor body (1) are spaced apart along a preset direction; A connecting portion (3), the connecting portion (3) being a tubular structure, one end of the connecting portion (3) being sealedly connected to the motor body (1), and the other end of the connecting portion (3) being sealedly connected to the junction box (2).

2. The flameproof motor for mining according to claim 1, characterized in that: Along the preset direction, the length of the connecting portion (3) ranges from 1.5 m to 2.5 m.

3. The flameproof motor for mining according to claim 1, characterized in that: The stator structure (14) comprises a stator core (141) and a stator winding (142) wound thereon, wherein the stator winding (142) is a three-phase distributed winding; The rotor structure (15) comprises a rotating shaft (150), a rotor core (151) and a permanent magnet (152); the rotating shaft (150) is inserted through the rotor core (151), and the permanent magnet (152) is embedded and installed in the rotor core (151).

4. The flameproof motor for mining according to claim 3, characterized in that: The flameproof motor for mining comprises: A first bearing device (161), the first bearing device (161) being mounted on the first end cover (12), the first bearing device (161) being matched with the shaft extension end of the rotating shaft (150); A second bearing device (162), the second bearing device (162) being mounted on the second end cover (13), the second bearing device (162) being matched with the non-axial extension end of the rotating shaft (150); The first bearing device (161) includes an angular contact bearing and a first column bearing, and the second bearing device (162) includes a second column bearing.

5. The flameproof motor for mining according to claim 3, characterized in that: The base (11) comprises a first end plate (171) and a second end plate (172), and along the axial direction of the flameproof motor for mining, the first end plate (171) and the second end plate (172) are respectively and correspondingly arranged at two ends of the main structure of the base (11); the flameproof motor for mining further comprises: A plurality of heat dissipation pipes (173), wherein the heat dissipation pipes (173) are all disposed through the first end plate (171) and the second end plate (172); A first cooling fan (174), the first cooling fan (174) being arranged in the main chamber, and along the axial direction of the mining flameproof motor, the first cooling fan (174) being located on one side of the first cooling fan (174) and the rotor core (151); A wind shield (175), wherein the wind shield (175) is arranged on a side of the first cooling fan (174) close to the stator structure (14).

6. The flameproof motor for mining according to claim 5, characterized in that: The flameproof motor for mining further comprises a plurality of support ribs (176), each of the support ribs (176) being arranged to extend along the axial direction of the flameproof motor for mining, each of the support ribs (176) being connected to the base (11), the first end plate (171) and the second end plate (172), and the plurality of support ribs (176) being arranged at intervals along the circumference of the flameproof motor for mining, and the heat dissipation pipe (173) being arranged between two adjacent support ribs (176).

7. The flameproof motor for mining according to claim 5, characterized in that: The flameproof motor for mining further comprises a second cooling fan (177) located outside the main chamber, and the second cooling fan (177) is connected to the rotating shaft (150).

8. The flameproof motor for mining according to any one of claims 3 to 7, characterized in that: The rotor core (151) is provided with a plurality of groups of ventilation holes (153), and the plurality of groups of ventilation holes (153) are arranged in sequence and at intervals along the circumferential direction of the mining flameproof motor. Each group of ventilation holes (153) includes a plurality of ventilation holes (153) arranged in sequence and at intervals along the axial direction of the mining flameproof motor. Any ventilation hole (153) is arranged to extend in the radial direction of the mining flameproof motor.

9. The flameproof motor for mining according to any one of claims 3 to 7, characterized in that: The stator core (141) comprises a plurality of stator slots (143), wherein the plurality of stator slots (143) are arranged in sequence and spaced apart along the circumference of the stator core (141), and an open slot (144) is provided at the inner wall of the slot opening of the stator slot (143); for any one of the stator slots (143), an angle θ between an inner slot surface of the open slot (144) and an extension direction of the stator slot (143) is 60°, and the inner slot surface of the open slot (144) is a surface of the open slot (144) close to the bottom of the stator slot (143).

10. A mining ventilation device, characterized in that: The mining ventilation equipment comprises a main ventilation duct, an impeller and a motor, wherein the motor is a mining flameproof motor as described in any one of claims 1 to 9, wherein the impeller is mounted on the rotor shaft of the mining flameproof motor, wherein the motor body (1) of the mining flameproof motor is arranged in the main ventilation duct, the junction box (2) of the mining flameproof motor is located outside the main ventilation duct, and the connection part (3) of the mining flameproof motor is arranged through the main ventilation duct.

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